EP0687755A1 - Tissu de fibres plastiques comportant des zones de renfort fondues - Google Patents

Tissu de fibres plastiques comportant des zones de renfort fondues Download PDF

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Publication number
EP0687755A1
EP0687755A1 EP95303017A EP95303017A EP0687755A1 EP 0687755 A1 EP0687755 A1 EP 0687755A1 EP 95303017 A EP95303017 A EP 95303017A EP 95303017 A EP95303017 A EP 95303017A EP 0687755 A1 EP0687755 A1 EP 0687755A1
Authority
EP
European Patent Office
Prior art keywords
fibers
plastic
woven
fused
strip
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.)
Withdrawn
Application number
EP95303017A
Other languages
German (de)
English (en)
Inventor
Arnold A. Kelson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
AT&T Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by AT&T Corp filed Critical AT&T Corp
Publication of EP0687755A1 publication Critical patent/EP0687755A1/fr
Withdrawn legal-status Critical Current

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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
    • B65D88/00—Large containers
    • B65D88/16—Large containers flexible
    • B65D88/1612—Flexible intermediate bulk containers [FIBC]
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45C—PURSES; LUGGAGE; HAND CARRIED BAGS
    • A45C5/00—Rigid or semi-rigid luggage
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/50—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads
    • D03D15/587—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads adhesive; fusible
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D13/00—Woven fabrics characterised by the special disposition of the warp or weft threads, e.g. with curved weft threads, with discontinuous warp threads, with diagonal warp or weft
    • D03D13/002—With diagonal warps or wefts
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/20—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads
    • D03D15/283—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads synthetic polymer-based, e.g. polyamide or polyester fibres
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2321/00—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D10B2321/02—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polyolefins
    • D10B2321/021—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polyolefins polyethylene
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2321/00—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D10B2321/02—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polyolefins
    • D10B2321/022—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polyolefins polypropylene
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • D10B2331/02—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • D10B2331/04—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyesters, e.g. polyethylene terephthalate [PET]
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2401/00—Physical properties
    • D10B2401/06—Load-responsive characteristics
    • D10B2401/062—Load-responsive characteristics stiff, shape retention

Definitions

  • This invention relates to cloth-like materials comprising woven plastic fibers, and particularly to means for adding stiffness to portions of articles made of such materials.
  • the prongs of the fork lift truck are inserted through loop handles attached to the upper ends of the bags.
  • the bag handles are made of the identical material of the bags, i.e., woven plastic fibers, and owing to the flexibility of the material, the loop handles tend to fold over under their own weight.
  • a problem thus caused is that threading the fork lift prongs through the folded over handles requires assistance, either by the fork lift operator who must dismount from the fork lift, or by a helper. In either case, manpower is wasted.
  • handles which include means, e.g., plastic rods or double layers of material and the like, for stiffening the handles to the point where they are self-standing when the bags are vertically oriented. While these various means are mechanically satisfactory, they increase costs and thus preferably avoided.
  • stiffness is increased by rigidly bonding together adjacent fibers of the material, e.g., by means of a surface region of fused together fibers.
  • the fused region is formed by heating a surface portion of the material for at least partially melting and fusing together surface portions of adjacent fibers. The fused material restrains relative movement between the fused together fibers thereby stiffening the material.
  • fused regions in the form of elongated strips are formed directly in the loop legs or are attached thereto in the form of ribs.
  • plastic is used herein in conformity with conventional usage and refers to various organic materials in common use.
  • Fig. 1 shows a side a side elevation of a plastic bag 10 having a generally square cross-section and which, except as hereinafter described, is known and commercially available.
  • the bag 10 has a closeable bottom end 12 and an open end 14 that is sealable.
  • the material of the bag 10 is a "cloth" woven from individual plastic fibers.
  • the bag 10 can be identical to known burlap or canvas bags except that it is made from plastic.
  • the plastic bag material although exceptionally strong, is quite flexible and normally will not stand on its own.
  • the bag is substantially completely filled with some material to be transported and the bag, when so filled, stands vertically.
  • handles 20 For lifting and transporting the bag 10, four handles 20 are provided, one each at each bag corner at the upper end of the bag. Two handles 20 are visible in Fig. 1.
  • the handles 20 project vertically upwardly from the bag upper end 14 and, as such, are "self-standing.”
  • the self-standing handles form open loops, hence a fork lift operator can readily thread the leading ends of the fork lift prongs through the handle loops without dismounting from the fork lift and without assistance from a helper.
  • the handle comprises an elongated strip of a woven plastic material.
  • the details of the woven pattern are of no particular importance. Preferably, however, as is conventional, a relatively tight weave is present, with much contact between adjacent fibers.
  • the woven material includes diagonal "threads" 24, held together by transverse threads 26. Other patterns of woven fibers are known and can be used.
  • elongated "stiffened" zones or areas 30 are provided along the vertical leg portions 22 of the handle loop. As shown, the stiffened areas 30 terminate on the vertical leg portions 32 and do not extend the full length of the handle. The stiffening provided by the areas 30 is sufficient to maintain the handles 20 in vertical orientation as shown in Fig. 1.
  • the "stiffened" areas are regions where adjacent, separate fibers are bonded together for reducing the amount of relative movement between the bound together fibers. This can be accomplished, for example, by applying a glue within the areas 30, which glue hardens to form a rigid area of glued together fibers.
  • the "glue” bonding together the fibers in the areas 30 is a fused material of the fibers themselves.
  • fused is meant that heat is applied to the fibers for at least partially liquefying them, with the molten material formed from adjacent fibers merging into a continuous molten mass.
  • FIG. 4 An elongated heated bar 40 of metal covered with a plastic non-adhering material, such as Teflon coated glass cloth, is pressed against the surface 42 at the end of an elongated strip 44 of the woven plastic material.
  • the bar 40 can be heated by placing it in an oven, although, preferably, an electric "iron" is used.
  • the temperature of the bar e.g. 170 degrees C for use with plastic fibers of polypropylene, is sufficient to cause melting of the plastic fibers contacted by the bar.
  • Pressure is applied against the bar 40, either externally or by virtue of the weight of the bar 40, such that the bar tends to sink into the surface 42 of the material 44 as the fibers 24 and 26 thereof begin to melt.
  • a continuous layer 46 of molten plastic is formed beneath the bar 40 but, preferably, not entirely through the thickness of the material 44.
  • the weave of the strip material is relatively tight and, owing both to the surface tension of the molten layer 46 and the close fitting underlying fibers, the molten plastic (relatively viscous) does not flow through the underlying fibers. Rather, a depression 30 (Fig. 3) is formed in the strip surface 42, with the side and bottom walls of the depression comprising a solid layer 48 of plastic.
  • the continuous layer 48 serves as a relatively stiff plate firmly glued to the adjoining fibers, thereby reducing the freedom of movement of the glued fibers relative to one another and to the stiff layer 48.
  • the fused layer 48 thus sufficiently stiffens the strip for maintaining the looped handles 20 in vertical orientation, as shown in Fig. 1, when the bag 10 is substantially full.
  • a relatively thin layer 48 of fused material is produced. That is, only a relatively small quantity of fiber (e.g., 10%) is liquefied for preserving the basic woven characteristic of the strip material. While the layer 48 does have some strength, its principal purpose is to serve as a glue for restraining relative movement between adjacent fibers, and it is the intact woven fibers which provide strength of the handle material.
  • a relatively small quantity of fiber e.g. 10%
  • the layer 48 does have some strength, its principal purpose is to serve as a glue for restraining relative movement between adjacent fibers, and it is the intact woven fibers which provide strength of the handle material.
  • Fig. 5 shows an embodiment where the strength of the plastic fabric or cloth is critical.
  • a rib 60 comprising a narrow strip of the woven plastic material is secured, as by stitching or stapling, to the surface of a sheet 62 of woven plastic material or, indeed, to any number of different types of materials, e.g., burlap or canvass and the like.
  • the presence of the rib 60 itself provides added stiffness to the underlying sheet and, in accordance with this invention, a surface 64 of the rib 60 is provided with a fused, stiffening region 66 formed as hereinbefore described.
  • An advantage of this embodiment is that the addition of a fused stiffening region 66, in the added rib 60, provides no weakening of the underlying sheet 62.
  • the quantity is not critical, and as much as 80% of the original fibers can be fused depending upon the particular use of the fused plastic material.
  • the stiffened area 30 is provided by the application of heat and, preferably, the process is performed by the bag manufacturer while the handles are separate from the bags and in the form of easily handled elongated strips.
  • the stiffening process can be "automated” using quite simple apparatus.
  • the thus stiffened handle strips are then attached to the bags in known manner, e.g., by stitching.
  • the invention has been described in connection with polypropylene plastic. Such plastic material does not emit excessive fumes when heated and such fumes as are emitted are not health hazardous.
  • plastic materials can be used. Examples are polyethylene, polyethylene terephthalate (“polyester”) and Nylon.
  • a rib 70 is provided which is not of woven plastic fibers (as in the rib 60 shown in Fig. 5), but is a solid bead of plastic which is fused to underlying fibers at the surface of the sheet 62 preferably, but not necessarily, of woven plastic fibers.
  • the rib 70 can be placed against the sheet surface and then heated to liquefy it.
  • the rib can be applied from a suitable applicator, e.g., similar to a caulking gun, as a heated, viscous bead which hardens as it cools and adheres to the fibers of the underlying sheet.
  • ribs or beads of the same composition as the underlying sheet 62 e.g., the foregoing specified "plastic" materials
  • other commercially available adhesives e.g., various epoxy cements, can be used to provide a stiffening rib of the type illustrated in Fig. 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Purses, Travelling Bags, Baskets, Or Suitcases (AREA)
  • Bag Frames (AREA)
  • Laminated Bodies (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
EP95303017A 1994-05-10 1995-05-03 Tissu de fibres plastiques comportant des zones de renfort fondues Withdrawn EP0687755A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US24111994A 1994-05-10 1994-05-10
US241119 1994-05-10

Publications (1)

Publication Number Publication Date
EP0687755A1 true EP0687755A1 (fr) 1995-12-20

Family

ID=22909337

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95303017A Withdrawn EP0687755A1 (fr) 1994-05-10 1995-05-03 Tissu de fibres plastiques comportant des zones de renfort fondues

Country Status (3)

Country Link
EP (1) EP0687755A1 (fr)
KR (1) KR950030917A (fr)
TW (1) TW252163B (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1362002A (fr) * 1963-04-13 1964-05-29 Procédé de fabrication de tissus destinés à subir un traitement thermique ultérieur
US3558412A (en) * 1967-12-26 1971-01-26 Milton Kurz Fabric containing melted and unmelted yarns and method for making the same
GB1339869A (en) * 1970-09-04 1973-12-05 Stotz & Co Stiffening insert for articles of clothing and process for the manufacture thereof
EP0030442A1 (fr) * 1979-12-05 1981-06-17 Miller Weblift Limited Récipient flexible pour produits en vrac
US4300608A (en) * 1980-05-07 1981-11-17 Bonar Industries Inc. Self-raising strap loop
EP0097496A2 (fr) * 1982-06-18 1984-01-04 Smith and Nephew Plastics Limited Procédé de renforcement d'étoffes supérieures et produits obtenus
JPH02182941A (ja) * 1988-12-28 1990-07-17 Katsukura Shiyokufu Kk 複合繊維を使用した保形性素材

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1362002A (fr) * 1963-04-13 1964-05-29 Procédé de fabrication de tissus destinés à subir un traitement thermique ultérieur
US3558412A (en) * 1967-12-26 1971-01-26 Milton Kurz Fabric containing melted and unmelted yarns and method for making the same
GB1339869A (en) * 1970-09-04 1973-12-05 Stotz & Co Stiffening insert for articles of clothing and process for the manufacture thereof
EP0030442A1 (fr) * 1979-12-05 1981-06-17 Miller Weblift Limited Récipient flexible pour produits en vrac
US4300608A (en) * 1980-05-07 1981-11-17 Bonar Industries Inc. Self-raising strap loop
EP0097496A2 (fr) * 1982-06-18 1984-01-04 Smith and Nephew Plastics Limited Procédé de renforcement d'étoffes supérieures et produits obtenus
JPH02182941A (ja) * 1988-12-28 1990-07-17 Katsukura Shiyokufu Kk 複合繊維を使用した保形性素材

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 014, no. 458 (C - 0766) 3 October 1990 (1990-10-03) *

Also Published As

Publication number Publication date
KR950030917A (ko) 1995-12-18
TW252163B (en) 1995-07-21

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