US3216677A - Wire screening - Google Patents

Wire screening Download PDF

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Publication number
US3216677A
US3216677A US211215A US21121562A US3216677A US 3216677 A US3216677 A US 3216677A US 211215 A US211215 A US 211215A US 21121562 A US21121562 A US 21121562A US 3216677 A US3216677 A US 3216677A
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Prior art keywords
screening
wires
warp
wire
weft wires
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US211215A
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Walter A Hofmann
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Barber Colman Co
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Warner and Swasey Co
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Priority claimed from US834784A external-priority patent/US3076252A/en
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Assigned to BARBER-COLMAN COMPANY reassignment BARBER-COLMAN COMPANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WARNER & SWASEY TEXTILE MACHINE COMPANY A CORP OF PA.
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F27/00—Making wire network, i.e. wire nets
    • B21F27/005—Wire network per se
    • 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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/58—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising fillers only, e.g. particles, powder, beads, flakes, spheres
    • 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
    • B29C65/749—Removing scrap

Definitions

  • Claim. (Cl. 24S10)
  • the present invention relates to screening and in particular to wire screening having a selvage edge.
  • the principal object of the present invention is the provision of a new and improved screening free of wire ends projecting beyond the edges thereof so that the screening may be readily and easily manually handled by a person grasp-ing the edge thereof without danger of cutting himself.
  • a further object of the present invention is the provision of a new and improved wire screening having a finished selvage edge which is less bulky than selvage edges produced by prior art methods, and wherein the selvage is quite flexible and does not detract from the flexibility or uses for the screening.
  • a further object of the present invention is the provision of a new and improved wire screening having a finished selvage edge which is inexpensive to manufacture and wherein the screening will not ravel and may be readily, efficiently and safely handled and used in any desired manner.
  • a more specific object of the present invention is the provision of a new and improved wire screening having warp wires and Weft wires with the opposite ends of the weft wires projecting beyond the opposite outermost warp wires and wherein the projecting ends of the weft wires are substantially embedded in plastic strip which bonds the ends of the weft wires together, fills the space between the ends of the weft wires, and eliminates projecting ends of the weft wires which may tend to cut a person handling the screening.
  • a further object of the present invention is the provision of a new and improved screening, as noted in the next preceding paragraph wherein, the plastic strip has one edge which is flush with the projecting ends of the weft wires and the other edge of the plastic strip is spaced outwardly from the adjacent outermost warp wire so as not to impair the flexibility of the screening.
  • FIG. 1 is a plan view of a length of wire screening embodying the present invention
  • FIG. 2 is a diagrammatic view of an apparatus for forming the screening shown in FIG. 1;
  • FIG. 3 is a plan view of wire screening manufactured by the apparatus shown in FIG. 2 during the various stages of manufacture.
  • FIG. 4 is an enlarged sectional view of the screening shown in FIG. 3 taken approximately along section line 44 of FIG. 3.
  • the preferred embodiment of the present invention is shown by way of example as embodied in a length of wire screening A shown in FIG. 1.
  • the length of wire screening A includes warp threads or wires 10, weft threads or Wires 11, and opposite finished selvage edges.
  • the left and right selvage edges, as viewed in FIG. 1, comprise ICC strips of fusible material 12, 13, respectively, in which the opposite end portions 14 of the weft wires which project beyond the opposite outermost warp wires 15 are embedded.
  • the opposite outer edges 16 and 17 of the strips 12, 13, respectively, are flush with the outer ends of the weft wires and the inner edges 18, 19 of the strips 12, 13, respectively, are spaced outwardly from the adjacent outermost warp wire 15.
  • the strips of fusible material 12 and 13 bond together the various end portions 14 of the weft wires projecting beyond the left and right outermost warp wires 15 and provide smooth, nonbulky edges on the screening to facilitate handling and prevent raveling of the screening. Moreover, the fusible strips are extremely flexible and do not detract from the flexibility of the screening nor limit the uses thereof.
  • the strips of fusible material 12, 13, which form the finished selvage edges, are preferably a thermoplastic, synthetic fiber such as nylon made from caprolactam with a 10% monomer plasticizer.
  • suitable fusible materials may also be used, for example, polyethylene, polypropylene, polyester and vinyl.
  • the screening illustrated may be made by a relatively simple manufacturing process.
  • the selvage edges are formed in the illustrated preferred embodiment by weaving fusible warp threads or strands into the screening at the oposite edges and then melting or fusing the strands to form the plastic strips 12, 13 in which the projecting ends 14 of the weft wires are embedded.
  • a plurality of fusible strands are woven into the screening adjacent each edge.
  • a pair of warp wires 10a provide the outboard Warp threads along each edge of the screening during the manufacture thereof, and immediately inward of the warp wires 10a along each edge of the screening are, in the illustrated embodiment, a pair of thermoplastic warp strands 10b.
  • the warps 10a may be termed binding wires since they function primarily to keep the thermoplastic strands 10b in place.
  • the thermoplastic strands 10b are preferably of a larger diameter than the warp wires 10 to provide the necessary material for embedding and bonding the projecting ends 14 of the weft wires together.
  • the warp Wires 10a and 101) are woven with the weft wires by conventional weaving apparatus, not shown, and then pass to a suitable heating station 25, at which the warp strands 10b are heated to render them plastic and fiowable.
  • the heating station 25, as shown, cornprises a pair of spaced heating elements 26 adjacent each edge of the screening between which the edges of the screen pass.
  • the heating elements 26 may be electrical or heated in any other suitable manner to provide sufiicient temperature to permit the fusing of the adjacent thermoplastic warps 10b into one plastic mass which bonds itself to the projecting ends 14 of the weft wires and fills the spaces therebetween.
  • the heating should be uniform and preferably renders the fusible material plastic and fiowable to fuse the strands 10b and bond the material to the projecting end portions 14 of the weft wires.
  • each selvage edge passes between a pair of rollers 31 which apply pressure to the heated plastic masses formed from the strands to even or smooth out the plastic strips 12, 13 and to assure the fusing together of the adjacent thermoplastic strands 10b and the bonding of the thermoplastic strip formed thereby to the projecting end portions 14 of the weft wires to provide the finished plastic selvage edges.
  • the melted warp strands 10b flow into the spaces between the weft wires to fairly till the spaces and encase the ends 14 of the weft wires,
  • the weft wires will be substantially embedded in the plastic mass and bonded together by strips 12, 13.
  • the screening is delivered to a slitting station 40 where a circular knife 41 adjacent each edge of the screening slits the outboard 'side of the fused and set material to remove the outboard warp wires a and the outboard portions 42 of the weft wires so that the remaining end portions 14 do not extend beyond the plastic strips 12, 13.
  • This provides a straight, relatively nonragged, plastic selvage edge, where the opposite outer edges 16, 17 of the plastic strips 12, 13, re- 'spectively, are flush with the outer ends of the weft wires and the innermost edges 18, 19 of the plastic strips 12, 13, respectively, are spaced outwardly from the adjacent outermost warp wire 15.
  • the screening following the removal of the outboard warp wires 10a and the provision of the smooth, even plastic strips 12, 13 on the opposite edges, is dried and painted in any conventional manner.
  • the fusible material used to form thefinished selvage edges is preferably selected to have a sufiiciently high melting temperature so that the screening can be painted and dried in conventional drying temperatures, usually about 350 F. without adversely affecting the plastic strips 12, 13.
  • the melting point can be varied by varying the percentage of plasticizer therein, as will be readily appreciated by those skilled in the art, to achieve the desired melting temperatures. Melting temperatures of 400 to 450 F. are suitable for most commercial processes.
  • Wire screening including a plurality of spaced warp wires and a plurality of spaced weft wires, said weft wires having end portions projecting beyond the opposite outermost warp wires, a substantially smooth surfaced strip of fusible thermoplastic material of substantially uniform thickness bonded to the end portions of the weft wires projecting beyond each outermost warp wire, each of said strips substantially filling the space between adjacent weft wires and encircling the end portions of the weft wires projecting beyond each outermost warp Wire and in embedding relation therewith, and each of said strips lying outwardly of the adjacent outermost warp wire and the outermost edge thereof being flush with the outer ends of the weft wires to which it is bonded and the other edge thereof being spaced outwardly from the adjacent outermost warp wire.

Description

Nov. 9, 1965 W. A. HOFMANN WIRE SCREENING Original Filed Aug. 19, 1959 INVENTOR. WALTER A. H P AN Qwwmq ORNE Y5 United States Patent 3,216,677 WIRE SCREENING Walter A. Hofmann, Lyndhurst, Ohio, assignor to The Warner 81 Swasey Company, Cleveland, Ohio, a corporation of Ohio Original application Aug. 19, 1959, Ser. No. 834,784, now Patent No. 3,076,252. Divided and this application July 20, 1962, Ser. No. 211,215
1 Claim. (Cl. 24S10) The present invention relates to screening and in particular to wire screening having a selvage edge.
This application is a divisional application of my allowed copending application, Serial No. 834,784, filed August 19, 1959, now Patent No. 3,076,252.
The principal object of the present invention is the provision of a new and improved screening free of wire ends projecting beyond the edges thereof so that the screening may be readily and easily manually handled by a person grasp-ing the edge thereof without danger of cutting himself.
A further object of the present invention is the provision of a new and improved wire screening having a finished selvage edge which is less bulky than selvage edges produced by prior art methods, and wherein the selvage is quite flexible and does not detract from the flexibility or uses for the screening.
A further object of the present invention is the provision of a new and improved wire screening having a finished selvage edge which is inexpensive to manufacture and wherein the screening will not ravel and may be readily, efficiently and safely handled and used in any desired manner.
A more specific object of the present invention is the provision of a new and improved wire screening having warp wires and Weft wires with the opposite ends of the weft wires projecting beyond the opposite outermost warp wires and wherein the projecting ends of the weft wires are substantially embedded in plastic strip which bonds the ends of the weft wires together, fills the space between the ends of the weft wires, and eliminates projecting ends of the weft wires which may tend to cut a person handling the screening.
A further object of the present invention is the provision of a new and improved screening, as noted in the next preceding paragraph wherein, the plastic strip has one edge which is flush with the projecting ends of the weft wires and the other edge of the plastic strip is spaced outwardly from the adjacent outermost warp wire so as not to impair the flexibility of the screening.
Further objects and advantages of the present invention will be apparent to those skilled in the art to which it relates from the following detailed description thereof, made with reference to the accompanying drawings forming a part of the specification, and in which:
FIG. 1 is a plan view of a length of wire screening embodying the present invention;
FIG. 2 is a diagrammatic view of an apparatus for forming the screening shown in FIG. 1;
FIG. 3 is a plan view of wire screening manufactured by the apparatus shown in FIG. 2 during the various stages of manufacture; and
FIG. 4 is an enlarged sectional view of the screening shown in FIG. 3 taken approximately along section line 44 of FIG. 3.
The preferred embodiment of the present invention is shown by way of example as embodied in a length of wire screening A shown in FIG. 1. The length of wire screening A includes warp threads or wires 10, weft threads or Wires 11, and opposite finished selvage edges. The left and right selvage edges, as viewed in FIG. 1, comprise ICC strips of fusible material 12, 13, respectively, in which the opposite end portions 14 of the weft wires which project beyond the opposite outermost warp wires 15 are embedded. The opposite outer edges 16 and 17 of the strips 12, 13, respectively, are flush with the outer ends of the weft wires and the inner edges 18, 19 of the strips 12, 13, respectively, are spaced outwardly from the adjacent outermost warp wire 15.
The strips of fusible material 12 and 13 bond together the various end portions 14 of the weft wires projecting beyond the left and right outermost warp wires 15 and provide smooth, nonbulky edges on the screening to facilitate handling and prevent raveling of the screening. Moreover, the fusible strips are extremely flexible and do not detract from the flexibility of the screening nor limit the uses thereof.
The strips of fusible material 12, 13, which form the finished selvage edges, are preferably a thermoplastic, synthetic fiber such as nylon made from caprolactam with a 10% monomer plasticizer. Other suitable fusible materials may also be used, for example, polyethylene, polypropylene, polyester and vinyl.
The screening illustrated may be made by a relatively simple manufacturing process. The selvage edges are formed in the illustrated preferred embodiment by weaving fusible warp threads or strands into the screening at the oposite edges and then melting or fusing the strands to form the plastic strips 12, 13 in which the projecting ends 14 of the weft wires are embedded. Preferably, a plurality of fusible strands are woven into the screening adjacent each edge. As shown in FIG. 3, a pair of warp wires 10a provide the outboard Warp threads along each edge of the screening during the manufacture thereof, and immediately inward of the warp wires 10a along each edge of the screening are, in the illustrated embodiment, a pair of thermoplastic warp strands 10b. It will be understood that the number of fusible warp strands may be varied. The warps 10a may be termed binding wires since they function primarily to keep the thermoplastic strands 10b in place. The thermoplastic strands 10b are preferably of a larger diameter than the warp wires 10 to provide the necessary material for embedding and bonding the projecting ends 14 of the weft wires together.
The warp Wires 10a and 101) are woven with the weft wires by conventional weaving apparatus, not shown, and then pass to a suitable heating station 25, at which the warp strands 10b are heated to render them plastic and fiowable. The heating station 25, as shown, cornprises a pair of spaced heating elements 26 adjacent each edge of the screening between which the edges of the screen pass. The heating elements 26 may be electrical or heated in any other suitable manner to provide sufiicient temperature to permit the fusing of the adjacent thermoplastic warps 10b into one plastic mass which bonds itself to the projecting ends 14 of the weft wires and fills the spaces therebetween. The heating should be uniform and preferably renders the fusible material plastic and fiowable to fuse the strands 10b and bond the material to the projecting end portions 14 of the weft wires.
From the heating station 25, the screening passes to a rolling station 30 where each selvage edge passes between a pair of rollers 31 which apply pressure to the heated plastic masses formed from the strands to even or smooth out the plastic strips 12, 13 and to assure the fusing together of the adjacent thermoplastic strands 10b and the bonding of the thermoplastic strip formed thereby to the projecting end portions 14 of the weft wires to provide the finished plastic selvage edges. The melted warp strands 10b flow into the spaces between the weft wires to fairly till the spaces and encase the ends 14 of the weft wires,
as shown in FIG. 3. The weft wires will be substantially embedded in the plastic mass and bonded together by strips 12, 13.
After the plastic strips 12, 13 are rolled to form a smooth and even selvage edge the screening is delivered to a slitting station 40 where a circular knife 41 adjacent each edge of the screening slits the outboard 'side of the fused and set material to remove the outboard warp wires a and the outboard portions 42 of the weft wires so that the remaining end portions 14 do not extend beyond the plastic strips 12, 13. This provides a straight, relatively nonragged, plastic selvage edge, where the opposite outer edges 16, 17 of the plastic strips 12, 13, re- 'spectively, are flush with the outer ends of the weft wires and the innermost edges 18, 19 of the plastic strips 12, 13, respectively, are spaced outwardly from the adjacent outermost warp wire 15.
The screening, following the removal of the outboard warp wires 10a and the provision of the smooth, even plastic strips 12, 13 on the opposite edges, is dried and painted in any conventional manner. The fusible material used to form thefinished selvage edges is preferably selected to have a sufiiciently high melting temperature so that the screening can be painted and dried in conventional drying temperatures, usually about 350 F. without adversely affecting the plastic strips 12, 13. When nylon is used to form the plastic strips the melting point can be varied by varying the percentage of plasticizer therein, as will be readily appreciated by those skilled in the art, to achieve the desired melting temperatures. Melting temperatures of 400 to 450 F. are suitable for most commercial processes.
The preferred embodiment of the present invention has been described in considerable detail and it is to be understood that other modifications, constructions and arrangements are contemplated and it is my intention to hereby cover all constructions, modifications and arrangements of the present invention that fall within the ability of those skilled in the art to which it relates and the scope and spirit of the appended claim.
Having thus described by invention, I claim:
Wire screening including a plurality of spaced warp wires and a plurality of spaced weft wires, said weft wires having end portions projecting beyond the opposite outermost warp wires, a substantially smooth surfaced strip of fusible thermoplastic material of substantially uniform thickness bonded to the end portions of the weft wires projecting beyond each outermost warp wire, each of said strips substantially filling the space between adjacent weft wires and encircling the end portions of the weft wires projecting beyond each outermost warp Wire and in embedding relation therewith, and each of said strips lying outwardly of the adjacent outermost warp wire and the outermost edge thereof being flush with the outer ends of the weft wires to which it is bonded and the other edge thereof being spaced outwardly from the adjacent outermost warp wire.
References Cited by the Examiner UNITED STATES PATENTS 2,211,081 8/40 Sinclair 245-10 2,659,958 11/53 Johnson 139425.5 2,718,791 9/55 Hose et al. 2,840,117 6/58 Scruggs 28-73 FOREIGN PATENTS 199,574 9/58 Austria.
CHARLES W. LANHAM, Primary Examiner. WHITMORE A. WILTZ, Examiner.
US211215A 1959-08-19 1962-07-20 Wire screening Expired - Lifetime US3216677A (en)

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US834784A US3076252A (en) 1959-08-19 1959-08-19 Wire screen selvage and method of manufacture
US211215A US3216677A (en) 1959-08-19 1962-07-20 Wire screening

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3897289A (en) * 1970-09-03 1975-07-29 Goodyear Tire & Rubber Method of forming wire woven fabric for pneumatic tires
US4272597A (en) * 1977-06-24 1981-06-09 Masaji Nishikawa Electrophotographic sensitizing screen

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2211081A (en) * 1936-04-13 1940-08-13 Peter S Sinclair Dandy roll and cylinder mold
US2659958A (en) * 1952-05-09 1953-11-24 Johnson Henry Fourdrinier wire having reinforced coated marginal portions
US2718791A (en) * 1950-12-02 1955-09-27 Lindsay Wire Weaving Co Edge reinforcement for paper-making woven wire belts and the method of applying the reinforcement
US2840117A (en) * 1954-05-21 1958-06-24 Bemis Bro Bag Co Method of selvage and seam manufacture and products thereof
AT199574B (en) * 1957-07-27 1958-09-10 Hutter & Schrantz Ag Siebwaren Woven goods

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2211081A (en) * 1936-04-13 1940-08-13 Peter S Sinclair Dandy roll and cylinder mold
US2718791A (en) * 1950-12-02 1955-09-27 Lindsay Wire Weaving Co Edge reinforcement for paper-making woven wire belts and the method of applying the reinforcement
US2659958A (en) * 1952-05-09 1953-11-24 Johnson Henry Fourdrinier wire having reinforced coated marginal portions
US2840117A (en) * 1954-05-21 1958-06-24 Bemis Bro Bag Co Method of selvage and seam manufacture and products thereof
AT199574B (en) * 1957-07-27 1958-09-10 Hutter & Schrantz Ag Siebwaren Woven goods

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3897289A (en) * 1970-09-03 1975-07-29 Goodyear Tire & Rubber Method of forming wire woven fabric for pneumatic tires
US4272597A (en) * 1977-06-24 1981-06-09 Masaji Nishikawa Electrophotographic sensitizing screen
US4279980A (en) * 1977-06-24 1981-07-21 Olympus Optical Co., Ltd. Electrophotographic sensitizing screen
US4394427A (en) * 1977-06-24 1983-07-19 Olympus Optical Company Limited Electrophotographic sensitizing screen with peripherally clogged apertures

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Owner name: BARBER-COLMAN COMPANY, 1300 ROCK ST.ROCKFORD,IL.61

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:WARNER & SWASEY TEXTILE MACHINE COMPANY A CORP OF PA.;REEL/FRAME:004031/0299

Effective date: 19820729