US20040083682A1 - Film clamp for film sealing apparatus and method - Google Patents
Film clamp for film sealing apparatus and method Download PDFInfo
- Publication number
- US20040083682A1 US20040083682A1 US10/286,435 US28643502A US2004083682A1 US 20040083682 A1 US20040083682 A1 US 20040083682A1 US 28643502 A US28643502 A US 28643502A US 2004083682 A1 US2004083682 A1 US 2004083682A1
- Authority
- US
- United States
- Prior art keywords
- film
- sealing
- clamp
- jaw
- sealing element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims description 11
- 239000002985 plastic film Substances 0.000 claims description 3
- 229920006255 plastic film Polymers 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 239000004020 conductor Substances 0.000 abstract description 4
- 238000013021 overheating Methods 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 3
- -1 polypropylene Polymers 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000012809 cooling fluid Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012858 packaging process Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical compound FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
- B65B51/10—Applying or generating heat or pressure or combinations thereof
- B65B51/26—Devices specially adapted for producing transverse or longitudinal seams in webs or tubes
- B65B51/30—Devices, e.g. jaws, for applying pressure and heat, e.g. for subdividing filled tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
- B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
- B29C65/221—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip
- B29C65/222—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip comprising at least a single heated wire
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
- B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
- B29C65/228—Heated wire resistive ribbon, resistive band or resistive strip characterised by the means for electrically connecting the ends of said heated wire, resistive ribbon, resistive band or resistive strip
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
- B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
- B29C65/229—Heated wire resistive ribbon, resistive band or resistive strip characterised by the means for tensioning said heated wire, resistive ribbon, resistive band or resistive strip
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/38—Impulse heating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
- B29C65/743—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc
- B29C65/7433—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc the tool being a wire
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
- B29C65/743—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc
- B29C65/7441—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc for making welds and cuts of other than simple rectilinear form
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/003—Protecting areas of the parts to be joined from overheating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
- B29C66/112—Single lapped joints
- B29C66/1122—Single lap to lap joints, i.e. overlap joints
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
- B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
- B29C66/244—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being non-straight, e.g. forming non-closed contours
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/345—Progressively making the joint, e.g. starting from the middle
- B29C66/3452—Making complete joints by combining partial joints
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
- B29C66/431—Joining the articles to themselves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
- B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
- B29C66/4322—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms by joining a single sheet to itself
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
- B29C66/7371—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined oriented or heat-shrinkable
- B29C66/73715—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined oriented or heat-shrinkable heat-shrinkable
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
- B29C66/816—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps
- B29C66/8161—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps said pressing elements being supported or backed-up by springs or by resilient material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
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- B29C66/818—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
- B29C66/8181—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects
- B29C66/81811—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects of the welding jaws
- B29C66/81812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects of the welding jaws the welding jaws being cooled from the outside, e.g. by blowing a gas or spraying a liquid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C66/80—General aspects of machine operations or constructions and parts thereof
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- B29C66/818—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
- B29C66/8182—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the thermal insulating constructional aspects
- B29C66/81821—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the thermal insulating constructional aspects of the welding jaws
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29C66/8187—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the electrical insulating constructional aspects
- B29C66/81871—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the electrical insulating constructional aspects of the welding jaws
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- B29C66/832—Reciprocating joining or pressing tools
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
- B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
- B29C66/91211—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods
- B29C66/91212—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods involving measurement means being part of the welding jaws, e.g. integrated in the welding jaws
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
- B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
- B29C66/91231—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature of the joining tool
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
- B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
- B29C66/91421—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the joining tools
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
- B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
- B29C66/91431—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature the temperature being kept constant over time
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
- B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
- B29C66/91641—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
- B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
- B29C66/91651—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating
- B29C66/91655—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating by controlling or regulating the current intensity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/94—Measuring or controlling the joining process by measuring or controlling the time
- B29C66/944—Measuring or controlling the joining process by measuring or controlling the time by controlling or regulating the time
- B29C66/9441—Measuring or controlling the joining process by measuring or controlling the time by controlling or regulating the time the time being controlled or regulated as a function of another parameter
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
- B65B51/10—Applying or generating heat or pressure or combinations thereof
- B65B51/14—Applying or generating heat or pressure or combinations thereof by reciprocating or oscillating members
- B65B51/146—Closing bags
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
- B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
- B29C65/221—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip
- B29C65/224—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip being a resistive ribbon, a resistive band or a resistive strip
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
- B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
- B29C66/8126—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
- B29C66/81261—Thermal properties, e.g. thermal conductivity, thermal expansion coefficient
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/94—Measuring or controlling the joining process by measuring or controlling the time
- B29C66/949—Measuring or controlling the joining process by measuring or controlling the time characterised by specific time values or ranges
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/96—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process
- B29C66/961—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving a feedback loop mechanism, e.g. comparison with a desired value
Definitions
- Packaging machines for wrapping and sealing plastic film about an article conventionally utilize a heated wire to seal film layers to one another and to melt through the layers in order to separate one article from another as the articles pass through the machine.
- Current is supplied to the wire to heat the wire to a high temperature in order to effect the seal and cutting operation.
- the ideal appearance of the resulting seal is fine and neat as the film shrinks tightly around the package, especially where polypropylene films are involved.
- Such hot wires are typically used to form both end seals and side seals.
- L-bar sealers are generally used to seal heat shrinkable plastic centerfolded film around an object to be packaged.
- the object to be packaged is wrapped with the film, and the L-sealer top jaw is lowered to cut and seal together abutting surfaces of the centerfold film.
- the L-bar makes two seals at one time, sealing both the edge of the centerfold wrap and also cutting and sealing across the width.
- Films such as polypropylene, PVC and polyethylene are typically sealed with L-bar sealers.
- the sealers can be manual, semi-automatic or fully automatic.
- the sealing element As the sealing element contacts the film and performs its intended function, it loses heat to the film as well as to the surrounding environment and near-by components. Accordingly, current must be continually or continuously supplied to the sealing element in order to maintain the appropriate temperature to perform the intended operation. However, heating the sealing element causes a corresponding temperature increase in adjacent and near-by components as well as the framework of the apparatus, which can be highly undesirable. Indeed, where the framework is constructed of a polymeric material, excess heat migrating into the polymeric components can melt the same.
- the present invention provides a film clamp for the lower or stationary jaw of a sealing machine, particularly the heated lower or stationary jaw of an L-bar sealing machine.
- the film clamp is constructed of a thermally conductive material and is configured to effectively dissipate heat.
- a closed loop feedback system can be used to regulate the applied power to the sealing element in order to maintain its temperature within a predetermined range to help prevent overheating of the film clamp and other jaw components.
- the use of the film clamp resluts in the film control required for consistent seal quality, especially when sealing heavier gauge films such as CORTUFF® (3 mils thick) commercially available Sealed Air Corporation.
- FIG. 1 is a perspective view of a seal jaw in an L-seal assembly in accordance with the present invention
- FIGS. 2 and 2A are views of a termination block of the seal jaw of FIG. 1;
- FIG. 3 is an exploded perspective view of the jaw assembly of the seal jaw of FIG. 1;
- FIG. 3A is a cross-sectional view of the jaw assembly of FIG. 3;
- FIG. 4 is a view, partially in section, showing a seal being made in accordance with the present invention.
- FIG. 1 there is a shown a portion of an L-seal apparatus for a packaging machine in accordance with an embodiment of the present invention.
- the bottom jaw of the L-bar includes a front jaw assembly 12 and a cross jaw assembly 10 .
- the cross jaw assembly 10 will be discussed to illustrate the construction of the L-bar, although those skilled in the art will appreciate that analogous components typically are used to make up the front jaw assembly 12 .
- the bottom jaw assembly is stationary and the top jaw assembly (not shown) is movable from an open non-sealing position to a closed, sealing position that sandwiches the film between the top and bottom jaws.
- the bottom jaw assembly could be movable and the top jaw assembly stationary, or both the top and bottom jaws could be movable.
- a termination block 14 (best seen in FIG. 2) is located at each of the ends of the L-bar and holds the sealing element in place. To that end, a sealing element is supported in slotted sealing element terminal 15 , and the terminal 15 rides in the block 14 to accommodate expansion and contraction of the sealing element due to its temperature variations. Compression spring 16 biases the terminal 15 inwardly as best seen in FIG. 2A, thereby allowing the terminal 15 to accommodate the expansion and contraction of the seal element.
- a TEFLON shielded wire 13 is in electrical communication with the seal element and with a current supply source (not shown) for providing current to the sealing element to heat the element to the desired temperature.
- FIGS. 3 and 3A illustrate the various components of the bottom cross jaw assembly 10 .
- Wave springs 17 support film clamp 18 on cross guard 19 as shown, and biases the film clamp 18 towards the film during sealing.
- the cross guard 19 is preferably constructed of a conductive material, preferably aluminum, and acts as a heat sink (with the aid of a plurality of projections 31 extending from its surface) to assist in dissipating heat from the sealing element.
- the film clamp is preferably an elongated linear substantially U-shaped member that can be formed by any suitable means, preferably by extrusion.
- substantially U-shaped is the provision for the opposite sides of film clamp 18 to extend upwardly at an inward angle, and surround bottom jaw member 20 that sits inside the opposite sides on spacers 21 .
- a large portion of the film clamp e.g., the lower portion of the clamp
- the top free end surfaces of the clamp as close to the sealing element as possible to minimize film waste (the closer the surface(s) of the film clamp that contact the film are to the sealing element, the less film is used in the packaging operation).
- the film clamp 18 includes a base 118 and opposite sides 119 , 120 extending therefrom that terminate in respective free ends 18 A and 18 B.
- the spacers 21 support the bottom jaw member 20 away from the cross guard 19 and isolate heat away from the cross guard 19 .
- the opposite sides 119 , 120 of the clamp 18 include one or more upwardly sloping projections 11 that serve as a heat sink to dissipate heat from the sealing element.
- the opposite sides terminate in respective free ends 18 A, 18 B that provide the surface against which the film is sandwiched during sealing. These surfaces effectively clamp the film being sealed in place, keeping it taut during the sealing operation to effect a high quality seal.
- the wave springs 17 on which the clamp 18 is supported allow for flexibility as the top seal jaw is compressed over the film to make the seal, forcing the clamp 18 downwardly so that the film contacts the seal element 30 .
- the number and spacing of the wave springs 17 is not critical as long as they effectively function to bias the clamp as discussed in greater detail below.
- the bottom jaw member 20 supports insulator 22 that is formed with a central slot (FIG. 3A) to hold the sealing element 30 and insulate it against heat and voltage.
- corner block 23 is coupled to corner mount 24 by any suitable means, such as with slotted screws 25 and hex screws 26 .
- the corner block 23 is made of a thermally conductive material, preferably brass.
- a heat sensing element 37 such as a thermocouple is positioned to sense a temperature that correlates to the temperature of the sealing element. Since sensing the temperature of the sealing element directly is often difficult due to the lack of surface area of the sealing element, preferably the heat sensing element 37 is positioned to sense the temperature of the corner block 23 .
- the heat sensing device is in direct contact with the corner block 23 , although positioning the sensing device in close proximity to the corner block 23 also is suitable.
- the sensing device 27 is also in electrical communication with a controller board (not shown).
- the sealing element is positioned in curved slot 29 of the corner block where it makes the turn from the cross jaw to the front jaw.
- the sealing element is in good thermal contact with the corner block 23 . Since the corner block 23 and sensing device 27 are centrally located along the length of the sealing element (the cross jaw and front jaw are generally about the same length), the temperature sensed by the sensing device 27 is an excellent indication of the average temperature of components of the jaw assembly that are in contact with or are near the sealing element.
- heat is input to the seal element 30 in an impulse mode.
- the closure of the top jaws activates a detection circuit that then triggers a specific duration of pulse of current through the seal element 30 to increase the temperature of the element to physically produce a seal and cut.
- the impulse replaces the heat that the seal wire loses during the sealing process, such as to the two webs of film and to the opposite seal surface, and the heat lost to the surrounding environment, particularly between seals.
- the suitable amount of current for the impulse mode and the duration of the impulse depend in part on the gauge and type of film to be sealed and the desired quality of the seal. For example, a voltage of 42 volts and a current of 48 amps are suitable for films typically used in L-bar sealers of this type.
- the current is kept constant; only the duration of the current is modified in response to the sensed temperature.
- the impulse duration may be from about 0.1 seconds to about 1.5 seconds, most preferably about 1 second.
- the heat sensing element 27 continuously or continually monitors the temperature of the mounting block 23 . When the sensed temperature exceeds a predetermined value or range of values, the control board reduces the duration of the impulse a predetermined amount.
- One method for determining an appropriate temperature above which is considered excessive, thereby triggering the reduction of impulse current duration is to determine the impulse current duration time set by the operator. From the impulse duration time selected, based on experience the operator can estimate the appropriate temperature of the sealing element (based, for example, on the nature of the film and the operating speed), and a suitable temperature above this estimated temperature is chosen above which would be considered excessive. A similar operation can be carried out to determine the minimum temperature necessary to effectuate a seal.
- Suitable sealing elements 30 include wires, bars and blades.
- the sealing element 30 is an elongated blade having a uniform cross-section. The uniform cross-section allows the blade to be turned over in the event the cutting edge becomes dull, thereby doubling its useful life.
- FIG. 4 the operation of the film clamp is shown with reference to the front jaw assembly.
- the film 100 is shown encasing a package 90 and extending beyond the package 90 between the top jaw assembly 80 and bottom jaw assembly, specifically, the film clamp 18 .
- the top jaw 80 pivots downwardly towards the bottom jaw and presses against the film clamps 18 and seal blade 30 , compressing the film under pressure to cut and seal the film.
- the film 100 to be sealed is pushed down into the sealing element, it first contacts the film clamp 18 .
- the clamp moves downwardly against the bias of the spring(s) 17 , causing the film to contact the sealing element, and the sealing element seals and cuts the film.
- the film clamp 18 holds the film 10 firmly against the top jaw and in a plane to enhance the seal quality.
- sealed edges of the overwrap and selvage 50 draw away from the heating element and each other in a controlled fashion, resulting in an optimal seal configuration.
- the film clamp 18 lifts the cut and sealed film up and away from the heating element (due to the biasing of the spring(s) 17 ). This lift keeps the film from dragging and depositing undesirable residue on the sealing element, which conventionally required frequent cleaning. In addition, lifting protects the quality of the sealed overwrap. Extra film selvage 50 is cut off in the sealing process.
- the film clamps of the present invention are positioned in the jaw assembly housing the sealing element, which most preferably is the lower and stationary jaw assembly.
Abstract
Film clamp for the lower or stationary jaw of a sealing machine, particularly the lower or stationary jaw of an L-bar sealing machine. Preferably the film clamp is constructed of a thermally conductive material and is configured to effectively dissipate heat. A closed loop feedback system can be used to regulate the applied power to the sealing element in order to maintain its temperature within a predetermined range to help prevent overheating of the film clamp and other jaw components.
Description
- Packaging machines for wrapping and sealing plastic film about an article conventionally utilize a heated wire to seal film layers to one another and to melt through the layers in order to separate one article from another as the articles pass through the machine. Current is supplied to the wire to heat the wire to a high temperature in order to effect the seal and cutting operation. The ideal appearance of the resulting seal is fine and neat as the film shrinks tightly around the package, especially where polypropylene films are involved. Such hot wires are typically used to form both end seals and side seals.
- L-bar sealers are generally used to seal heat shrinkable plastic centerfolded film around an object to be packaged. The object to be packaged is wrapped with the film, and the L-sealer top jaw is lowered to cut and seal together abutting surfaces of the centerfold film. The L-bar makes two seals at one time, sealing both the edge of the centerfold wrap and also cutting and sealing across the width. Films such as polypropylene, PVC and polyethylene are typically sealed with L-bar sealers. The sealers can be manual, semi-automatic or fully automatic.
- As the sealing element contacts the film and performs its intended function, it loses heat to the film as well as to the surrounding environment and near-by components. Accordingly, current must be continually or continuously supplied to the sealing element in order to maintain the appropriate temperature to perform the intended operation. However, heating the sealing element causes a corresponding temperature increase in adjacent and near-by components as well as the framework of the apparatus, which can be highly undesirable. Indeed, where the framework is constructed of a polymeric material, excess heat migrating into the polymeric components can melt the same.
- This heating of adjacent and near-by components has in some cases resulted in the elimination of the use of film clamps in the upper sealing jaw. Although such film clamps are desirable to hold the film in place during sealing, if such clamps become too hot, film in contact with the clamps will be heated and can begin to shrink prematurely. Premature film shrinking can result in poor package appearance or even a complete failure of the packaging process.
- It therefore would be desirable to provide a seal system for an L-type sealing apparatus that utilizes film clamps and prevents their overheating by maintaining the temperature of the seal element within a desired range.
- It further would be desirable to provide a film clamp in the lower or stationary jaw of an L-bar type sealing machine to effectuate a consistently high quality seal.
- It further would be desirable to provide a film clamp that keeps the film from draping over the sealing element upon contact, and from depositing residue and potentially overheating and burning seals.
- These and other objects will be made apparent by reference to the following description and drawings.
- The problems of the prior art have been overcome by the present invention, which provides a film clamp for the lower or stationary jaw of a sealing machine, particularly the heated lower or stationary jaw of an L-bar sealing machine. Preferably the film clamp is constructed of a thermally conductive material and is configured to effectively dissipate heat. A closed loop feedback system can be used to regulate the applied power to the sealing element in order to maintain its temperature within a predetermined range to help prevent overheating of the film clamp and other jaw components. The use of the film clamp resluts in the film control required for consistent seal quality, especially when sealing heavier gauge films such as CORTUFF® (3 mils thick) commercially available Sealed Air Corporation.
- FIG. 1 is a perspective view of a seal jaw in an L-seal assembly in accordance with the present invention;
- FIGS. 2 and 2A are views of a termination block of the seal jaw of FIG. 1;
- FIG. 3 is an exploded perspective view of the jaw assembly of the seal jaw of FIG. 1;
- FIG. 3A is a cross-sectional view of the jaw assembly of FIG. 3; and
- FIG. 4 is a view, partially in section, showing a seal being made in accordance with the present invention.
- Turning now to FIG. 1, there is a shown a portion of an L-seal apparatus for a packaging machine in accordance with an embodiment of the present invention. The bottom jaw of the L-bar includes a
front jaw assembly 12 and across jaw assembly 10. For purposes of illustration, thecross jaw assembly 10 will be discussed to illustrate the construction of the L-bar, although those skilled in the art will appreciate that analogous components typically are used to make up thefront jaw assembly 12. In the preferred embodiment shown, the bottom jaw assembly is stationary and the top jaw assembly (not shown) is movable from an open non-sealing position to a closed, sealing position that sandwiches the film between the top and bottom jaws. Those skilled in the art will appreciate that the bottom jaw assembly could be movable and the top jaw assembly stationary, or both the top and bottom jaws could be movable. - A termination block14 (best seen in FIG. 2) is located at each of the ends of the L-bar and holds the sealing element in place. To that end, a sealing element is supported in slotted
sealing element terminal 15, and theterminal 15 rides in theblock 14 to accommodate expansion and contraction of the sealing element due to its temperature variations. Compression spring 16 biases theterminal 15 inwardly as best seen in FIG. 2A, thereby allowing theterminal 15 to accommodate the expansion and contraction of the seal element. A TEFLON shieldedwire 13 is in electrical communication with the seal element and with a current supply source (not shown) for providing current to the sealing element to heat the element to the desired temperature. - FIGS. 3 and 3A illustrate the various components of the bottom
cross jaw assembly 10.Wave springs 17 supportfilm clamp 18 oncross guard 19 as shown, and biases thefilm clamp 18 towards the film during sealing. Thecross guard 19 is preferably constructed of a conductive material, preferably aluminum, and acts as a heat sink (with the aid of a plurality ofprojections 31 extending from its surface) to assist in dissipating heat from the sealing element. The film clamp is preferably an elongated linear substantially U-shaped member that can be formed by any suitable means, preferably by extrusion. Encompassed within the term “substantially U-shaped” is the provision for the opposite sides offilm clamp 18 to extend upwardly at an inward angle, and surroundbottom jaw member 20 that sits inside the opposite sides onspacers 21. By so tapering the film clamp towards the seal element, a large portion of the film clamp (e.g., the lower portion of the clamp) can be positioned as far away as possible from the hot sealing element to keep the clamp relatively cool without sacrificing the positioning of the top free end surfaces of the clamp as close to the sealing element as possible to minimize film waste (the closer the surface(s) of the film clamp that contact the film are to the sealing element, the less film is used in the packaging operation). Thus, thefilm clamp 18 includes abase 118 andopposite sides spacers 21 support thebottom jaw member 20 away from thecross guard 19 and isolate heat away from thecross guard 19. Preferably theopposite sides clamp 18 include one or more upwardly sloping projections 11 that serve as a heat sink to dissipate heat from the sealing element. The opposite sides terminate in respective free ends 18A, 18B that provide the surface against which the film is sandwiched during sealing. These surfaces effectively clamp the film being sealed in place, keeping it taut during the sealing operation to effect a high quality seal. These surfaces are positioned higher than thesealing element 30 when the assembly is not in a sealing mode, so that when the top jaw assembly is forced downwardly against the bottom jaw assembly, the film first contacts the film clamp before contacting the sealing element. A distance of about {fraction (1/16)} of an inch above the sealing element has been found to be suitable. Thewave springs 17 on which theclamp 18 is supported allow for flexibility as the top seal jaw is compressed over the film to make the seal, forcing theclamp 18 downwardly so that the film contacts theseal element 30. The number and spacing of thewave springs 17 is not critical as long as they effectively function to bias the clamp as discussed in greater detail below. Thebottom jaw member 20 supportsinsulator 22 that is formed with a central slot (FIG. 3A) to hold thesealing element 30 and insulate it against heat and voltage. - Turning back to FIG. 1,
corner block 23 is coupled tocorner mount 24 by any suitable means, such as with slotted screws 25 and hex screws 26. Thecorner block 23 is made of a thermally conductive material, preferably brass. A heat sensing element 37 such as a thermocouple is positioned to sense a temperature that correlates to the temperature of the sealing element. Since sensing the temperature of the sealing element directly is often difficult due to the lack of surface area of the sealing element, preferably the heat sensing element 37 is positioned to sense the temperature of thecorner block 23. Preferably the heat sensing device is in direct contact with thecorner block 23, although positioning the sensing device in close proximity to thecorner block 23 also is suitable. Thesensing device 27 is also in electrical communication with a controller board (not shown). The sealing element is positioned in curved slot 29 of the corner block where it makes the turn from the cross jaw to the front jaw. The sealing element is in good thermal contact with thecorner block 23. Since thecorner block 23 andsensing device 27 are centrally located along the length of the sealing element (the cross jaw and front jaw are generally about the same length), the temperature sensed by thesensing device 27 is an excellent indication of the average temperature of components of the jaw assembly that are in contact with or are near the sealing element. - As set forth in co-pending patent application entitled “Apparatus and Method for Controlling Temperature of a Film Sealing Element” filed concurrently herewith, the disclosure of which is hereby incorporated by reference, heat is input to the
seal element 30 in an impulse mode. For example, at the point of jaw closure where the hot seal element is pressing the film layers against a sealing pad surface, the closure of the top jaws activates a detection circuit that then triggers a specific duration of pulse of current through theseal element 30 to increase the temperature of the element to physically produce a seal and cut. The impulse replaces the heat that the seal wire loses during the sealing process, such as to the two webs of film and to the opposite seal surface, and the heat lost to the surrounding environment, particularly between seals. The suitable amount of current for the impulse mode and the duration of the impulse depend in part on the gauge and type of film to be sealed and the desired quality of the seal. For example, a voltage of 42 volts and a current of 48 amps are suitable for films typically used in L-bar sealers of this type. The current is kept constant; only the duration of the current is modified in response to the sensed temperature. Preferably the impulse duration may be from about 0.1 seconds to about 1.5 seconds, most preferably about 1 second. Theheat sensing element 27 continuously or continually monitors the temperature of the mountingblock 23. When the sensed temperature exceeds a predetermined value or range of values, the control board reduces the duration of the impulse a predetermined amount. One method for determining an appropriate temperature above which is considered excessive, thereby triggering the reduction of impulse current duration, is to determine the impulse current duration time set by the operator. From the impulse duration time selected, based on experience the operator can estimate the appropriate temperature of the sealing element (based, for example, on the nature of the film and the operating speed), and a suitable temperature above this estimated temperature is chosen above which would be considered excessive. A similar operation can be carried out to determine the minimum temperature necessary to effectuate a seal. - As a result, the seal element holder, the film clamps, the framework of the apparatus, and other adjacent components are kept relatively cool. Indeed, because of the excessive temperatures occurring in the prior art devices, a film clamp either could not be used, or had to be cooled with a cooling fluid that required extensive engineering and was problematic.
-
Suitable sealing elements 30 include wires, bars and blades. Preferably the sealingelement 30 is an elongated blade having a uniform cross-section. The uniform cross-section allows the blade to be turned over in the event the cutting edge becomes dull, thereby doubling its useful life. - Turning now to FIG. 4, the operation of the film clamp is shown with reference to the front jaw assembly. The
film 100 is shown encasing apackage 90 and extending beyond thepackage 90 between thetop jaw assembly 80 and bottom jaw assembly, specifically, thefilm clamp 18. Thetop jaw 80 pivots downwardly towards the bottom jaw and presses against the film clamps 18 andseal blade 30, compressing the film under pressure to cut and seal the film. As thefilm 100 to be sealed is pushed down into the sealing element, it first contacts thefilm clamp 18. As the force continues, the clamp moves downwardly against the bias of the spring(s) 17, causing the film to contact the sealing element, and the sealing element seals and cuts the film. During this operation, thefilm clamp 18 holds thefilm 10 firmly against the top jaw and in a plane to enhance the seal quality. As the sealing and cut progress through thefilm 10, sealed edges of the overwrap andselvage 50 draw away from the heating element and each other in a controlled fashion, resulting in an optimal seal configuration. As the pressure is released, thefilm clamp 18 lifts the cut and sealed film up and away from the heating element (due to the biasing of the spring(s) 17). This lift keeps the film from dragging and depositing undesirable residue on the sealing element, which conventionally required frequent cleaning. In addition, lifting protects the quality of the sealed overwrap.Extra film selvage 50 is cut off in the sealing process. - Preferably the film clamps of the present invention are positioned in the jaw assembly housing the sealing element, which most preferably is the lower and stationary jaw assembly.
Claims (16)
1. Apparatus for sealing a plastic film, comprising:
a top jaw assembly and a bottom jaw assembly housing a sealing element, said top jaw assembly and bottom jaw assembly being movable with respect to each other;
a source of power to heat said sealing element to a temperature effective for sealing said plastic film; and
a film clamp in said bottom jaw assembly having at least one surface for positioning said film with respect to said sealing element.
2. The apparatus of claim 1 , wherein said bottom jaw assembly is stationary and said to jaw assembly is movable.
3. The apparatus of claim 1 , wherein said film clamp comprises a plurality of projections for dissipating heat.
4. The apparatus of claim 1 , further comprising a spring in said bottom jaw for biasing said film clamp towards said top jaw assembly.
5. The apparatus of claim 4 , wherein said biasing of said film clamp maintains said film out of contact with said sealing element after the sealing operation has been completed.
6. The apparatus of claim 1 , wherein said film clamp is movable between a first pre-sealing position wherein said at least one surface positions said film above and out of contact with said sealing element and a second sealing position wherein said at least one surface positions said film in contact with said sealing element.
7. The apparatus of claim 6 , wherein said film clamp is movable between said first and second positions upon the application of pressure from said top jaw assembly.
8. The apparatus of claim 6 , further comprising at least one spring in said bottom jaw assembly supporting said film clamp, and wherein said at least one spring is in a compressed state when said film clamp is in said second position.
9. The apparatus of claim 1 , wherein said film clamp is substantially U-shaped and comprises a base and a pair of opposite sides terminating in a respective pair of free ends.
10. The apparatus of claim 9 , wherein said opposite sides of said film clamp taper inwardly towards said sealing element.
11. A method for sealing film about an article, comprising:
providing upper and lower sealing jaws movable with respect to each other, said lower sealing jaw comprising a sealing element and a film clamp;
compressing said film between said upper sealing jaw and said and lower sealing jaws so as to cause said film to contact said film clamp; and
further compressing said film between said upper sealing jaw and said lower sealing jaw so as to cause said film to contact said sealing element to seal said film.
12. The method of claim 11 , wherein during said first compressing step said film clamp is in a first pre-sealing position wherein said film clamp positions said film out of contact with said sealing element and during said further compressing step said film clamp is in a second sealing position wherein said film clamp positions said film in contact with said sealing element.
13. The method of claim 12 , further comprising terminating compression of said film to cause said film clamp to return to said first position.
14. A method for sealing film about an article, comprising:
providing a movable upper jaw and a stationary lower jaw, said lower jaw comprising a sealing element and a film clamp;
positioning said sealing film between said upper and low jaw;
moving said upper jaw towards said lower jaw and forcing said sealing film on said film clamp above said sealing element; and
contacting said upper jaw and said lower jaw so as to force said film to contact said sealing element to seal said film.
15. The method of claim 14 , wherein said film clamp is movable between a first non-sealing position wherein said film clamp positions said film out of contact with said sealing element and a second sealing position wherein said film clamp positions said film in contact with said sealing element.
16. The method of claim 15 , further comprising terminating contact between said upper and lower jaws to cause said film clamp to return to said first position.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/286,435 US20040083682A1 (en) | 2002-11-01 | 2002-11-01 | Film clamp for film sealing apparatus and method |
AU2003254748A AU2003254748A1 (en) | 2002-11-01 | 2003-10-16 | Film clamp for film sealing apparatus and method |
CA002447296A CA2447296A1 (en) | 2002-11-01 | 2003-10-30 | Film clamp for film sealing apparatus and method |
EP20030256894 EP1415790A1 (en) | 2002-11-01 | 2003-10-30 | Film clamp for film sealing apparatus and method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/286,435 US20040083682A1 (en) | 2002-11-01 | 2002-11-01 | Film clamp for film sealing apparatus and method |
Publications (1)
Publication Number | Publication Date |
---|---|
US20040083682A1 true US20040083682A1 (en) | 2004-05-06 |
Family
ID=32093587
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/286,435 Abandoned US20040083682A1 (en) | 2002-11-01 | 2002-11-01 | Film clamp for film sealing apparatus and method |
Country Status (4)
Country | Link |
---|---|
US (1) | US20040083682A1 (en) |
EP (1) | EP1415790A1 (en) |
AU (1) | AU2003254748A1 (en) |
CA (1) | CA2447296A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120110956A1 (en) * | 2010-10-13 | 2012-05-10 | Multivac Sepp Haggenmueller Gmbh & Co. Kg | Method and chamber machine for sealing packaging material |
US20140130464A1 (en) * | 2012-11-15 | 2014-05-15 | Brother Kogyo Kabushiki Kaisha | Packaging Device |
CN113525762A (en) * | 2021-08-05 | 2021-10-22 | 黄琦 | Vacuum packaging machine |
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US1397917A (en) * | 1920-03-23 | 1921-11-22 | Lox Seal Corp | Lock-tag |
US3135077A (en) * | 1962-04-09 | 1964-06-02 | Weldotron Corp | Impulse heat-sealing apparatus and heat-sealing member therefor |
US3142608A (en) * | 1960-08-22 | 1964-07-28 | Techtmann Ind Inc | Bag and wrapper sealing and cutoff mechanism |
US3214884A (en) * | 1962-06-18 | 1965-11-02 | Reginald R Kiefer | Package wrapping machine |
US3262833A (en) * | 1963-12-17 | 1966-07-26 | Zelnick Seymour | Impulse radiant sealer |
US3276940A (en) * | 1963-07-08 | 1966-10-04 | James M Vanlandingham | Heat sealing wrapping device |
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US3976196A (en) * | 1972-08-22 | 1976-08-24 | Owens-Illinois, Inc. | Packaging system |
US4377738A (en) * | 1977-01-22 | 1983-03-22 | Foresight Enterprises, Incorporated | Method of controlling the temperature of an electrically heated element |
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US4650535A (en) * | 1985-08-13 | 1987-03-17 | Creative Packaging Machinery, Inc. | Apparatus for heat-sealing thermoplastic sheeting |
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US5603801A (en) * | 1993-04-30 | 1997-02-18 | Defriese; John M. | Infinite universal sealing assembly |
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US6131375A (en) * | 1996-06-21 | 2000-10-17 | Sealed Air Corporation (Us) | Apparatus for producing foam cushions utilizing flexible foam mixing chamber |
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FR1397917A (en) * | 1963-04-12 | 1965-05-07 | Weldotron Corp | Apparatus and method for forming packages with heat sealable packaging material |
US3912575A (en) * | 1972-07-05 | 1975-10-14 | Weldotron Corp | Heat sealing apparatus using a wire sealing element |
-
2002
- 2002-11-01 US US10/286,435 patent/US20040083682A1/en not_active Abandoned
-
2003
- 2003-10-16 AU AU2003254748A patent/AU2003254748A1/en not_active Abandoned
- 2003-10-30 EP EP20030256894 patent/EP1415790A1/en not_active Withdrawn
- 2003-10-30 CA CA002447296A patent/CA2447296A1/en not_active Abandoned
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US1397917A (en) * | 1920-03-23 | 1921-11-22 | Lox Seal Corp | Lock-tag |
US3142608A (en) * | 1960-08-22 | 1964-07-28 | Techtmann Ind Inc | Bag and wrapper sealing and cutoff mechanism |
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US5597499A (en) * | 1995-03-31 | 1997-01-28 | Shanklin Corporation | Seal wire control for packaging machinery responsive to product flow |
US6131375A (en) * | 1996-06-21 | 2000-10-17 | Sealed Air Corporation (Us) | Apparatus for producing foam cushions utilizing flexible foam mixing chamber |
US5791125A (en) * | 1997-06-17 | 1998-08-11 | Illinois Tool Works, Inc. | Rotary heat sealer and method therefor |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120110956A1 (en) * | 2010-10-13 | 2012-05-10 | Multivac Sepp Haggenmueller Gmbh & Co. Kg | Method and chamber machine for sealing packaging material |
US20140130464A1 (en) * | 2012-11-15 | 2014-05-15 | Brother Kogyo Kabushiki Kaisha | Packaging Device |
US9434493B2 (en) * | 2012-11-15 | 2016-09-06 | Brother Kogyo Kabushiki Kaisha | Packaging device |
CN113525762A (en) * | 2021-08-05 | 2021-10-22 | 黄琦 | Vacuum packaging machine |
Also Published As
Publication number | Publication date |
---|---|
AU2003254748A1 (en) | 2004-05-20 |
EP1415790A1 (en) | 2004-05-06 |
CA2447296A1 (en) | 2004-05-01 |
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Legal Events
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AS | Assignment |
Owner name: SHANKLIN CORPORATION, MASSACHUSETTS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ORSINI, THOMAS P.;REEL/FRAME:013697/0809 Effective date: 20021127 |
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STCB | Information on status: application discontinuation |
Free format text: EXPRESSLY ABANDONED -- DURING EXAMINATION |