WO2001094227A1 - Closure device - Google Patents
Closure device Download PDFInfo
- Publication number
- WO2001094227A1 WO2001094227A1 PCT/US2000/040117 US0040117W WO0194227A1 WO 2001094227 A1 WO2001094227 A1 WO 2001094227A1 US 0040117 W US0040117 W US 0040117W WO 0194227 A1 WO0194227 A1 WO 0194227A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fastening strips
- flange portion
- fastening
- slider
- strips
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D33/00—Details of, or accessories for, sacks or bags
- B65D33/16—End- or aperture-closing arrangements or devices
- B65D33/25—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners
- B65D33/2508—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor
- B65D33/2589—Bag or slide fastener details cooperating with the slider, e.g. details for removing or installing the slider
Definitions
- the present invention relates generally to closure devices and, more particularly, to a slider and interlocking fastening strips.
- the invention is particularly well suited for fastening flexible storage containers, including plastic bags.
- closure devices for fastening storage containers, including plastic bags
- closure devices made of plastic materials is generally known to those skilled in the art, as demonstrated by the numerous patents in this area.
- closure devices are in connection with flexible storage containers, such as plastic bags.
- the closure device and the associated container are formed from thermoplastic materials, and the closure device and the sidewalls of the container are integrally formed by extrusion as a single piece.
- the closure device and sidewalls of the container may be formed as separate pieces and then connected by heat sealing or any other suitable connecting process. In either event, such closure devices are particularly useful in providing a closure means for retaining matter within the bag.
- Conventional closure devices typically utilize mating fastening strips or closure elements, which are used to selectively seal the bag.
- sliders may be provided for use in opening and closing the fastening strips.
- the sliders may include a separator which extends at least partially between the fastening strips. If the slider is moved in the opening direction, the separator divides or deoccludes the fastening strips and opens the bag. If the slider is moved in the closing direction, the slider closes or occludes the fastening strips.
- the separator When the slider is at the closed end of the bag, the separator is still positioned between the fastening strips and, thus, the fastening strips at the closed end of the bag may not be fully occluded. If the fastening strips are not fully occluded the bag may allow air to enter or the bag may allow the contents of the bag to leak from the bag. These situations are not desirable.
- the present invention provides a solution to this problem.
- the closure device includes first- and second interlocking fastening strips arranged to be to be interlocked over a . predetermined length.
- the closure device additionally includes a slider which is slidably disposed on the interlocking fastening strips for facilitating the occlusion and deocclusion of the fastening strips when moved towards first and second ends of the fastening strips.
- the fastening strips include an upper flange portion that engages a separator on the slider.
- the flange portion angles inwardly toward the separator.
- the flange portion is altered at the closing end of the fastening strips to prevent the slider from opening the fastening strips at the closing end.
- the flange portion may be altered by flattening the flange portion.
- Fig. 1 is a perspective view of a container according to the present invention in the form of a plastic bag
- Fig. 2 is a fragmentary side view of the container in Fig. 1;
- Fig. 3 is a cross-sectional view taken along line 3-3 in Fig. 2;
- Fig. 4 is a_ fragmentary side view of the container in Fig. 1 with the slider in another position;
- Fig. 5 is a fragmentary top view of the closure device in Fig. 4;
- Fig. 6 is a cross-sectional view taken along line 6-6 in Fig. 4;
- Fig. 7 is a cross-sectional view of another embodiment of the fastening strips
- Fig. 8 is a cross-sectional view of another embodiment of the fastening strips
- Fig. 9 is a cross-sectional view of another embodiment of the fastening strips.
- Figs. 1-3 illustrate an embodiment of a container in the form of a plastic bag 120 having a sealable closure device
- the bag 120 includes a first sidewall 122 and a second sidewall 123 joined at seams 125, 126 to define a compartment accessible through the open top end but sealable by means of the closure device 121.
- the closure device 121 includes first and second fastening strips 130, 131 and a slider 132.
- the fastening strips 130, 131 and the slider 132 have a longitudinal X axis 102, a transverse Y axis 104 and a vertical Z axis 106.
- the transverse Y axis 104 is perpendicular to the longitudinal X axis 102.
- the vertical Z axis 106 is perpendicular to the longitudinal X axis 102 and the vertical Z axis 106 is perpendicular to the transverse Y axis 104.
- the fastening strips 130, 131 are adapted to be interlocked between a first end 127 and a second end 128.
- the fastening strips 130, 131 are secured together at the first and second ends 127, 128 to form end seals.
- the first and second ends 127, 128 may include melted portions 135, 137, in which the fastening strips 130, 131 are melted together by heat sealing, ultrasonic sealing or other operation to form the end seals.
- the first and second ends 127, 128 may alternatively be secured together by plastic clamps, or other means.
- the slider 132 is mounted onto the fastening strips 130, 131 so that the slider 132 is restrained from being removed from the fastening strips 130, 131 but free to slide along the X axis 102.
- the slider 132 engages the fastening strips 130, 131 so that when the slider 132 moves in an occlusion direction 114, the fastening strips 130, 131 interlock and the bag 120 is sealed, and when the slider 132 moves in a deoccl ⁇ sion direction 116, the fastening strips 130, 131 separate and the bag 120 is open.
- the first fastening strip 130 includes a first closure element 136.
- the second fastening strip 131 includes a second closure element 134.
- the first closure element 136 engages the second closure element 134.
- the first closure element 136 includes a base portion 148 including a pair of spaced-apart, parallely disposed webs 150, 151 extending from the base portion 148.
- the base and the webs form a U-channel closure element.
- the webs 150, 151 include hook closure portions 152, 154 extending from the webs 150, 151 respectively and facing away from each other.
- the hook closure portions 152, 154 include guide surfaces 145, 155 which generally serve to guide the hook closure portions 152, 154 for occlusion with the hook closure portion 142, 144 of the second closure element 134.
- the guide surfaces 145, 155 may also have a rounded crown surface.
- the second closure element 134 includes a base portion 138 having a pair of spaced-apart parallely disposed webs 140, 141, extending from the base portion 138.
- the base and the webs form a U- channel closure element.
- the webs 140 include hook closure portions 142, 144 extending from the webs 140, 141 respectively, and facing towards each other.
- the hook closure portions 142, 144 include guide surfaces 146, 147 which serve to guide the hook closure portions 142, 144 for occluding with the hook closure portions 152, 154 of the first closure element 136.
- the first fastening strip 130 includes an upper flange portion 163.
- the flange portion 163 extends inwardly from the base portion 148.
- the flange portion 163 may extend from the base portion 148 or the flange portion 163 may extend from the flange 169.
- the first fastening strip 130 may include a rib 167 disposed at the lower end of the first fastening strip 130.
- the second fastening strip 131 includes an upper flange portion 153.
- the flange portion 153 extends inwardly from the base portion 138.
- the flange portion 153 may extend from the base portion 138 or the flange portion 153 may extend from the flange 159.
- the second fastening strip 131 may include a rib 157 disposed at- the lower end of the second fastening strip 131.
- the slider 132 includes a separator 143 having a first end and a. second end wherein the first end may be.wider than the second end.
- the separator 143 may be triangular in shape.
- the flange portions 153, 163 include altered flange portions 172, 174 near the first end 127 for facilitating the closure of the fastening strips at the first end 127.
- the altered flange portions 172, 174 are created by flattening the flange portions 153, 163 near the first end 127. When the flange portions are flattened, the plastic may move upward.
- the altered flange portions are created by removing a portion of the flange portion near the first end 127. The altered flange portions 172, 174 prevent the separator 143 from deoccluding the fastening strips near the first end 127.
- the closure elements 134, 136 remain occluded when the slider is at the first end 127. Specifically, the upper hook portions 142, 152 and the lower hook portions 144, 154 remain occluded -when the slider is at the first end 127.
- the altered flange portions 172, 174 create a discontinuity in the fastening strips 130, 131, which prevents the separator 143 from deoccluding the closure elements 134, 136 on the fastening strips.
- the altered flange portions 172, 174 do not allow separator 143 to act upon the flange portions in a manner sufficient to separate the closure elements 134, 136.
- the closure elements 134, 136 remain occluded a the first end 127.
- Figs. 7-9 illustrate interlocking fastening strips of different configurations with a slider.
- the interlocking fastening strips may comprise "arrowhead- type” or "rib and gropve” fastening strips as shown in Fig. 7 and as described in U.S. Patent 3,806,998.
- the " rib element 205 interlocks with the groove element 207.
- the rib element 205 is of generally arrow-shape in transverse cross section including a head 210 comprising interlock shoulder hook portions 211 and 212 generally convergently related to provide ⁇ a cam ridge 213 generally aligned with a stem ' flange 214 by which the head is connected in spaced relation with respect to the supporting flange portion 208. (U.S. Patent 3,806,998, Col. 2, lines 16- 23) .
- the shoulder portions 211 and 212 define reentrant angles therewith providing interlock hooks engageable with interlock hook flanges 215 and 217 respectively of the groove element 207.
- Said hook flanges generally converge toward one another and are spread open to receive the head 210 therebetween when said head is pressed into said groove .element 207 until the head is fully received in a groove 218 of said groove element 207 generally complementary to the head and within which the head is interlocked • by interengagement of the head shoulder hook portions 211 and 212 and the groove hook flanges 215 and 217.
- the head and groove elements 205 and 207 are adapted to be interlockingly engaged by being pressed together and to be separated when forcably pulled apart, as by means of a generally U-shaped slider 219. (U.S. Patent 3,806,998, Col. 2, lines 36- 41).
- the slider 219 includes a flat back plate 220 adapted to run along free edges 221 on the upper ends of the sections of the flange portions 208 arid 209 as shown in the drawing.
- U.S. Patent 3,806,998, Col. 2, lines 41-46 Integrally formed with the back plate 220 and extending in the same direction (downwardly as shown) therefrom are respective coextensive side walls 222 with an intermediate spreader finger 223 extending in the same direction as the side walls at one end o-f the slider.
- the side walls 222 are in the form of panels which are laterally divergent from a narrower end of the slider.
- the slider .walls 222 are each provided with an inwardly projecting shoulder structure 224 flange adapted to engage respective shoulder ribs 225 and 227 on respectively outer sides of the lower section of the flange portions 208 and 209.
- the fastening strips may include flange (s) as noted above and the flange (s) are shown altered in Fig. 7.
- the interlocking fastening strips may comprise "profile" fastening strips, as shown in Fig. 8 and described in U.S. Patent 5,664,299.
- the first profile 316 has at least an uppermost closure element 316a and a bottommost closure element 3162?. " (U.S. Patent 5,664,299, Col. 3, lines 25- 27) .
- the closure elements 316a and 3162? project laterally from the' inner surface of strip 314. (U.S. Patent 5,664,299, Col. 3, lines 27-28) .
- the second, profile 317 has at .least an uppermost closure element 317a and a bottommost closure element 3172?. (U.S. Patent 5,664,299, Col.
- closure elements 317a and 3172? project laterally from the inner surface of strip 315.
- U.S. Patent 5,664,299, Col. 3, lines 30-32 When the bag is. closed, the closure elements of profile 316 ( interlock with the corresponding closure elements of profile 317. .(U.S. Patent 5,664,299, Col. 3, lines 32-34).
- closure elements 316a, 3162?, 317a and 3172? have hooks on the ends of the closure elements, so that the profiles remain interlocked when the bag is closed, thereby forming a seal.
- U.S. Patent 5,664,299, Col. 3, lines 34-37 U.S. Patent 5,664,299, Col. 3, lines 34-37.
- the straddling slider 310 comprises an inverted -U-shaped member having a top 320 for moving along the top edges of the strips 314 and 315.
- the slider 310 has side walls 321 and 322 depending from the top 320.
- a separating leg 323 depends from the top 320 between the side walls 321 and 322 and is located between the uppermost closure elements 316a and 317a of profiles 316 and 317. (U.S. Patent 5,664,299, Col. 4, lines 26-30) .
- the fastening assembly includes ridges 325 on the outer surfaces of the fastening strips 314 and 315, and shoulders 3212? and 3222? on the side walls of the slider.
- the shoulders act as means for maintaining the slider in straddling relation with the fastening strips by grasping the lower surfaces of the ridg s 325.
- the fastening strips may include flange (s) as noted above and the flange (s) are shown altered in Fig. 8.
- the interlocking fastening strips may be "rolling action" fastening strips as shown in Fig. 9 and described in U.S. Patent 5,007,143.
- the strips 414 and 415 include profiled tracks' 418 and 419 extending along the length thereof parallel to the rib and groove elements 416 and 417 and the rib and groove elements 416, 417 have complimentary cross-sectional shapes such that they are , closed by pressing the bottom of the elements - together first and then rolling the elements to a closed position toward the top thereof. (U.S. Patent 5,007,143, Col. 4, line 62 to Col. 5, line 1). '
- the rib element 416 is hook shaped and projects from the inner face of strip 414.- (U.S. Patent 5,007,143, Col. 5, -lines 1-3).
- the groove element 417 includes a lower hook-shaped projection 417a and a relatively straight projection 4172? which extend from the inner face of strip 415.
- the straddling slider 410- comprises an inverted U-s ' haped plastic member having .a back 420 for moving along the top edges of the tracks 418 and 419 with side walls 421 and 422 depending therefrom for cooperating with the tracks and extending from an opening end of the slider to a closing end.
- U.S. Patent 5,007,143, Col. 5, lines 26-31 A separator finger 423 depends from the back 420 between the side walls 421 and 422 and is inserted between the inclined tracks 418 and 419.
- the slider 410 has shoulders
- track 418 and/or track 419 would-be altered near the closing end of the fastening strips.
- the interlocking fastening strips may be manufactured by extrusion through a die.
- the interlocking fastening strips may be formed from any suitable thermoplastic material including, for example, polyethylene, polypropylene, nylon, or the like, or from a combination thereof.
- resins or mixtures of resins such as high density polyethylene, medium density polyethylene, and low density polyethylene may be employed to prepare the interlocking fastening strips.
- the fastening strips may be made from low density polyethylene.
- the fastening strips and the films that form the body of the bag may be manufactured from heat sealable material..
- the bag may ' be economically formed by ' using an aforementioned thermoplastic material ' and by heat sealing the fastening strips to the bag.
- the bag may be made from a mixture of high pressure, low density polyethylene and linear, low density polyethylene.
- the fastening strips may be manufactured . by extrusion or other known methods.
- the closure device may be manufactured as individual fastening strips for later attachment to the bag or may be manufactured integrally with the bag.
- the -alteration of the upper flange portions may be formed using rollers which flatten the material.
- the fastening strips can be manufactured in a variety of forms to suit the intended use.
- the fastening strips may be integrally formed on the opposing sidewalls of the container or bag, or connected to the container by the use of any of many known ' methods .
- a thermoelectric device may be applied to a film in contact with, the flange portion of the fastening strips or the thermoelectric device may be applied to a film in contact with the base portion of fastening strips having no flange portion, to cause a transfer of heat through the film to produce melting at the interface of the film and a flange portion or base portion of the fastening strips.
- Suitable thermoelectric devices include heated rotary discs, traveling heater bands, resistance-heated slide wires, and the like.
- connection between the film and the fastening strips may also be established by the use of hot melt adhesives, hot jets of air to the interface, ultrasonic heating, or other known methods.
- the bonding of- the fastening strips to- the film stock may be carried out either before or after the film is U-folded to form the bag. In any event, such bonding is done prior to side sealing the bag at the edges by conventional thermal cutting.
- the first and second fastening strips may be positioned on opposite sides of the film. Such an embodiment ' would be suited for wrapping, an object or a collection of. objects such as wires.
- the first and second fastening strips may be positioned on the film in a generally parallel relationship with respect to each other, although this will depend on the intended use.
- the slider may be multiple parts and snapped together. In addition, the slider may be made from multiple parts and fused or welded together.
- the slider may also be a one piece construction.
- the slider can be colored, opaque, translucent or transparent.
- the slider may be injection molded or made by any other method.
- the slider may be molded from any suitable plastic material, such as, nylon, polypropylene, polystyrene, acetal, toughened acetal, polyketone, polybutylene terrephthalate, high density polyethylene, polycarbonate or ABS (acrylonitrile-butadiene-styrene) .
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002381164A CA2381164C (en) | 2000-06-06 | 2000-06-06 | Closure device |
PCT/US2000/040117 WO2001094227A1 (en) | 2000-06-06 | 2000-06-06 | Closure device |
US10/049,319 US6996879B1 (en) | 2000-06-06 | 2000-06-06 | Closure device |
AU57911/00A AU782133B2 (en) | 2000-06-06 | 2000-06-06 | Closure device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US2000/040117 WO2001094227A1 (en) | 2000-06-06 | 2000-06-06 | Closure device |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001094227A1 true WO2001094227A1 (en) | 2001-12-13 |
Family
ID=21742118
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2000/040117 WO2001094227A1 (en) | 2000-06-06 | 2000-06-06 | Closure device |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU782133B2 (en) |
CA (1) | CA2381164C (en) |
WO (1) | WO2001094227A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1407681A2 (en) * | 2002-10-07 | 2004-04-14 | Pactiv Corporation | Ultrasonic end stops on zipper closure bags and methods for making same |
WO2008091461A1 (en) * | 2007-01-24 | 2008-07-31 | Illinois Tool Works Inc. | Slider zipper with wide track profile for powder and granulated products |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5007143A (en) * | 1990-03-07 | 1991-04-16 | Mobil Oil Corp. | Rolling action zipper profile and slipper therefor |
US5067208A (en) * | 1991-03-22 | 1991-11-26 | Mobil Oil Corporation | Plastic reclosable fastener with self-locking slider |
US5301395A (en) * | 1993-07-29 | 1994-04-12 | Mobil Oil Corporation | Plastic reclosable fastener with structure for restraining slider in closed position and for facilitating reopening fastener |
US5664299A (en) * | 1996-09-10 | 1997-09-09 | Dowbrands L.P. | Reclosable fastener assembly |
US5833791A (en) * | 1996-08-16 | 1998-11-10 | Tenneco Packaging | Conforming end stops for a plastic zipper |
US5871281A (en) * | 1996-11-25 | 1999-02-16 | Kcl Corporation | Zipper slider pivoting wedge |
-
2000
- 2000-06-06 CA CA002381164A patent/CA2381164C/en not_active Expired - Fee Related
- 2000-06-06 AU AU57911/00A patent/AU782133B2/en not_active Ceased
- 2000-06-06 WO PCT/US2000/040117 patent/WO2001094227A1/en active IP Right Grant
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5007143A (en) * | 1990-03-07 | 1991-04-16 | Mobil Oil Corp. | Rolling action zipper profile and slipper therefor |
US5067208A (en) * | 1991-03-22 | 1991-11-26 | Mobil Oil Corporation | Plastic reclosable fastener with self-locking slider |
US5301395A (en) * | 1993-07-29 | 1994-04-12 | Mobil Oil Corporation | Plastic reclosable fastener with structure for restraining slider in closed position and for facilitating reopening fastener |
US5833791A (en) * | 1996-08-16 | 1998-11-10 | Tenneco Packaging | Conforming end stops for a plastic zipper |
US5664299A (en) * | 1996-09-10 | 1997-09-09 | Dowbrands L.P. | Reclosable fastener assembly |
US5871281A (en) * | 1996-11-25 | 1999-02-16 | Kcl Corporation | Zipper slider pivoting wedge |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1407681A2 (en) * | 2002-10-07 | 2004-04-14 | Pactiv Corporation | Ultrasonic end stops on zipper closure bags and methods for making same |
EP1407681A3 (en) * | 2002-10-07 | 2004-09-08 | Pactiv Corporation | Ultrasonic end stops on zipper closure bags and methods for making same |
US7267856B2 (en) | 2002-10-07 | 2007-09-11 | Pactiv Corporation | Ultrasonic end stops on zipper closure bags and methods for making same |
US7669307B2 (en) | 2002-10-07 | 2010-03-02 | Pactiv Corporation | Ultrasonic end stops on zipper closure bags and methods for making same |
AU2003248378B2 (en) * | 2002-10-07 | 2010-07-22 | Reynolds Presto Products Inc. | Ultrasonic end stops on zipper closure bags and methods for making same |
US7921534B2 (en) | 2002-10-07 | 2011-04-12 | Pactiv Corporation | Ultrasonic end stops on zipper closure bags and methods for making same |
WO2008091461A1 (en) * | 2007-01-24 | 2008-07-31 | Illinois Tool Works Inc. | Slider zipper with wide track profile for powder and granulated products |
Also Published As
Publication number | Publication date |
---|---|
AU782133B2 (en) | 2005-07-07 |
CA2381164C (en) | 2006-12-05 |
CA2381164A1 (en) | 2001-12-13 |
AU5791100A (en) | 2001-12-17 |
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