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Publication numberUS3718725 A
Publication typeGrant
Publication dateFeb 27, 1973
Filing dateNov 17, 1970
Priority dateNov 17, 1970
Also published asDE2104317A1, DE2104317B2, US3770359
Publication numberUS 3718725 A, US 3718725A, US-A-3718725, US3718725 A, US3718725A
InventorsH Hamano
Original AssigneeInt Knitlock Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Method for making hook fabric material for fasteners
US 3718725 A
Abstract
Methods are disclosed including the use of heat and chemicals for converting loops upstanding from a base fabric into hook members suitable for use in hook and loop fasteners.
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Description  (OCR text may contain errors)

United States Patent 1191 Hamano 1451 Feb. 27, 1973 METHOD FOR MAKING HOOK [56] References Cited F ABRIC MATERIAL FOR FASTENERS UNITED STATES PATENTS [75] Inventor: msaslnhmam P 3 607,995 9/1971 Chiba "264/322 3,320,649 5/1967 Naimer.... [73] Ass'gnee g' y i ib g Cmporafion 2,582,132 1/1952 Kaphan ..264/343 x ew 1 2,587,792 3/1952 Sivers ..264/DIG. 66 [22] i d; 17,1970 3,408,705 11/1968 Kayser ..24/204 PP NO-I 90,382 Primary ExaminerRobert F. White Assistant Examiner-Richard R. Kucia 52 us. c1. ..264/l63, 28/72 P, 264/296, Tay'm and Adams 264/322 [5 Int. [58] Field 0fSearcl'1..264/322, DIG. 66, 163, 1 294-29 Methods are disclosed including the use of heat and chemicals for converting loops upstanding from a base fabric into hook members suitable for use in hook and loop fasteners.

3 Claims, 8 Drawing Figures PATENTED E Z 3,718,725

SHEET 10F 2 INVENTOR. HISASHI HAMANO ATTORNEYS PATENTEDFEBZYIBH SHEET 2 BF 2 INVENTOR. HISASHI HAMANO BY ,6 /f7% i w ATTORNEYS METHOD FOR MAKING HOOK FABRIC MATERIAL FOR FASTENERS BACKGROUND OF THE INVENTION Hook and loop fasteners have found many applications and operate on the principle of having two interengaging surfaces one of loops and the other of hooks. Separation is effected by peeling one fastener element from the other. Much effort has been spent in SUMMARY OF THE INVENTION The present invention employs a base fabric having a series of looped piles in regular rows upstanding therefrom as a starting material. The rows of loops first are held by rods inserted therein and, in accordance with certain forms of the invention thereafter platens or rollers are to provide heat and pressure caused to pass over the upper ends of the rods thus effecting the conversion of the loops into various hooked forms. The invention further provides chemical means in combination with mechanical pressure for converting loops into hooked forms.

These and other aspects of the invention will become apparent from a detailed examination of the following description of preferred embodiments and of the accompanying drawing.

BRIEF DESCRIPTION OF THE DRAWING loop into two hook-like forms.

FIG. 5 is an alternate form of heated platen employing a similar method to that of FIG. 1;

FIG. 6 is a detail showing of the platen used in the apparatus of FIG. 5;

FIG. 7 is still another alternate form of apparatus to convert loops into a series of knob shaped hooks; and

FIG. 8 illustrates the use of a chemical bath to begin initial deformation of loops.

DESCRIPTION OF A PREFERRED EMBODIMENT .Referring to the drawing and initially to FIGS. 1-4 thereof, there has been illustrated a base fabric 10 which may be knitted or woven and upstanding rows of loops 11 has inserted therebetween a rod or mandrel 12 which will maintain the loops in their upstanding position. A first heated platen 13 will be passedover the tops of the loops 11 to melt the summits thereof (see FIG. 3). Thereafter, a second platen therefrom a plurality of rows of loops 11. Each of the 14 of cooler temperature will be passed over the now melted ends 11a of the two upstanding legs 1 1b of each loop 11 to press the still molten ends into knob 1111 as shown in FIG. 4.

In accordance with the apparatus of FIGS. 5 and 6, a variation of the apparatus and method of FIG. 1 has been shown. A heated platen 16 has a triangular shaped ridge 17 along the bottom thereof, the front end 17a being of sharp or fairly acute angular shape while the rear 17b of substantially flatter angular shape. The front end 17a is kept at a high temperature while the rear end 17b is kept at a lower temperature; consequently, the loops 11' will be heated and cut by the front end 17a and the passing of the rear end 17b will cause the half melted loops to be crushed to form into knob like projections such as those shown in FIG. 4.

In accordance with the embodiment of FIG. 7, loops 11 are held by rods 12 and are first subjected to the cutting action of rotary cutter 20. Thereafter, a heated roller 21 will pass over the cut ends to melt and crush the loop ends into the configuration of FIG. 4.

FIG. 8 discloses an alternate method employing the use of a chemical bath 22. In accordance with this method, fabric having upstanding loops 11 has passed over a roller 23 which dips the summits of the loops 11 into a chemical solvent. For example in the case of nylon, formic acid would be used. The chemical solution half melts the tip ends of the loops thereby softening them. Thereafter, the loops will be passed beneath a pressing roller 24 which crushes the softened tip ends, the applied chemical being removed by evaporation or other suitable methods to fix the shape of the deformed tip ends.

The above methods and apparatus as disclosed will produce a pile fabric which is very suitable for use as a fastener. The hook or the knoblike hooks formed will interengage with loop pile material or with other knob ended pile material.

It will be understood that the above description of preferred embodiments is merely representative and that reference should be made to the appended claims in order to o appreciate the spirit and scope of the present invention.

What is claimed is:

1. The method of forming knob-like projections from a multiplicity of pile loops upstanding from a flat base material to form a hooked pile surface suitable for use as a fastener element comprising, taking a flat base sheet having rows of loops upstanding therefrom made of a heat deformable material, rigidly supporting said loops in an uprightposition by placing a mandrel within said loops, applying heat and pressure to the summits of said loops to melt the summits while separating said loops to form separate upstanding legs, and thereafter cooling the ends of said upstanding legs while simultaneously pressing the ends of said legs into knob-like projections.

2. The method according to claim 1 wherein the step of applying heat and pressure is accomplished by passing a heated platen linearly along said rows of loops and the step of cooling and pressing is accomplished by passing a cooling platen linearly along said rows of loops.

3. The method of forming knob-like projections from a multiplicity of pile loops upstanding from a flat base legs while simultaneously forming the ends of said upstanding legs into softened partially formed knob-like projections and applying pressure to the ends of said legs to crush and to form the softened ends into knoblike projections.

III t

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2582132 *Jan 30, 1948Jan 8, 1952Kaphan LudwigDecorated flexible fabric and method for making the same
US2587792 *Aug 13, 1947Mar 4, 1952Sivers Carl Henric VonMethod for rounding the tips of bristles
US3320649 *Mar 21, 1966May 23, 1967Naimer JackMethods of making separable fastening fabrics
US3408705 *Jul 7, 1966Nov 5, 1968Minnesota Mining & MfgFastener articles
US3607995 *Jul 22, 1968Sep 21, 1971Chiba YoshioMethod for producing terminal structures
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4110138 *Mar 17, 1977Aug 29, 1978Junichi NomuraHand craft yarn art materials and structure and methods of manufacture and use thereof
US4272473 *Dec 7, 1978Jun 9, 1981The Procter & Gamble CompanyMethod for embossing and perforating a running ribbon of thermoplastic film on a metallic pattern roll
US4338800 *May 8, 1980Jul 13, 1982Yoshida Kogyo K.K.Velvet-type fastener web
US4628709 *Mar 18, 1985Dec 16, 1986Actief N.V.Apparatus and method for producing knitted hook-type fastener material
US4853070 *Nov 15, 1988Aug 1, 1989Erblok AssociatesApparatus for making multiple hook fastener media
US4862563 *Jul 13, 1987Sep 5, 1989Jane Marie FlynnSecuring strap and fastener
US5077870 *Sep 21, 1990Jan 7, 1992Minnesota Mining And Manufacturing CompanyMushroom-type hook strip for a mechanical fastener
US5505747 *Jan 13, 1994Apr 9, 1996Minnesota Mining And Manufacturing CompanyMolding, bonding, deforming
US5607635 *Nov 8, 1991Mar 4, 1997Minnesota Mining And Manufacturing CompanyMushroom-type hook strip for a mechanical fastener
US5667540 *Mar 13, 1996Sep 16, 1997Minnesota Mining And Manufacturing CompanyMethod of making an abrasive article
US5672186 *Mar 13, 1996Sep 30, 1997Minnesota Mining And Manufacturing CompanyRolling flowable polymeric material onto surface of base sheet, then shaping polymer into projections which are bent to form releasable fastener hooks when solidified and bonding reverse of base sheet to reverse of abrasive sheet
US5679302 *Apr 16, 1993Oct 21, 1997Minnesota Mining And Manufacturing CompanyMethod for making a mushroom-type hook strip for a mechanical fastener
US5691026 *Mar 8, 1994Nov 25, 1997Minnesota Mining And Manufacturing CompanyFastener member with a dual purpose cover sheet
US5691027 *Sep 29, 1995Nov 25, 1997Minnesota Mining And Manufacturing CompanyFastener with a dual purpose cover sheet
US5725423 *Mar 3, 1997Mar 10, 1998Minnesota Mining And Manufacturing CompanyAbrading apparatus
US5785784 *Jul 23, 1997Jul 28, 1998Minnesota Mining And Manufacturing CompanyAbrasive articles method of making same and abrading apparatus
US5840089 *Jul 29, 1997Nov 24, 1998Minnesota Mining And Manufacturing CompanyMethod of making an abrasive article
US5845375 *May 30, 1997Dec 8, 1998Minnesota Mining And Manufacturing CompanyMushroom-type hook strip for a mechanical fastener
US5868987 *Jun 19, 1997Feb 9, 1999Minnesotamining And ManufacturingSuperimposed embossing of capped stem mechanical fastener structures
US5879604 *Oct 25, 1996Mar 9, 1999Minnesota Mining And Manufacturing CompanyMethod of making a mushroom-type hook strip for a mechanical fastener
US5902427 *Jul 11, 1997May 11, 1999Minnesota Mining And Manufacturing CompanyFastener arrangement with dual purpose cover sheet
US5953797 *Oct 9, 1996Sep 21, 1999Velcro Industries B.V.Hook fasteners and methods of manufacture
US5980230 *Apr 11, 1997Nov 9, 1999Velcro Industries B.V.Forming fastener products
US6000106 *Mar 17, 1998Dec 14, 19993M Innovative Properties CompanySuperimposed embossing of capped stem mechanical fastener structures
US6039911 *Jan 9, 1997Mar 21, 20003M Innovative Properties CompanyMethod for capping stem fasteners
US6054091 *Oct 3, 1996Apr 25, 2000Minnesota Mining And Manufacturing Co.J hook-type hook strip for a mechanical fastener
US6132660 *Jun 19, 1997Oct 17, 20003M Innovative Properties CompanyMethod for forming headed stem mechanical fasteners
US6248276 *Jan 15, 1999Jun 19, 2001Velcro Industries B.V.Heating to the softening point the ends of preformed stems protruding in an array from a common base, contacting the ends with a flattening surface to deform the ends into a disk or mushroom shaped head
US6280670Aug 22, 1997Aug 28, 2001Velcro Industries B.V.Post- forming heads on fastener elements
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US6368097Aug 5, 1999Apr 9, 20023M Innovative Properties CompanyApparatus for capping stem fasteners
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US6526633Dec 17, 2001Mar 4, 2003Velcro Industries B.V.Hook fasteners and methods of manufacture
US6558602Dec 11, 1996May 6, 20033M Innovative Properties CompanyMushroom-type hook strip for a mechanical fastener
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US6579162Dec 15, 2000Jun 17, 20033M Innovative Properties CompanyAbrasive article
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EP0771537A2Oct 21, 1996May 7, 1997Ykk CorporationMolded surface fastener, and method and apparatus for manufacturing the same
WO1994023610A1 *Mar 7, 1994Oct 27, 1994Minnesota Mining & MfgMushroom-type hook strip for a mechanical fastener
WO1998014086A1 *Aug 20, 1997Apr 9, 1998Minnesota Mining & MfgJ hook-type hook strip for a mechanical fastener
WO2005067756A1 *Oct 28, 2004Jul 28, 20053M Innovative Properties CoSplit hook fastener
WO2013071031A1Nov 9, 2012May 16, 2013The Procter & Gamble CompanyAbsorbent articles with hook and loop fastening systems
WO2014001432A1 *Jun 27, 2013Jan 3, 2014Sofradim ProductionMethod of making a knit with barbs
WO2014004807A1Jun 27, 2013Jan 3, 2014The Procter & Gamble CompanyMethod for producing a multi-layer nonwoven web having enhanced mechanical properties
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Classifications
U.S. Classification264/163, 28/161, 264/322, 264/296
International ClassificationB29C67/00, A44B18/00, D06C29/00, B29C59/02, D06C13/08
Cooperative ClassificationD06C13/08, B29C59/025, D04B21/20, B29C67/0044, D06C29/00, D10B2501/0632, B29C2793/00, B29L2031/729, B29L2031/765, D04B21/04, B29C67/00, A44B18/0065, Y10S425/041
European ClassificationB29C67/00, D06C29/00, B29C67/00K, D06C13/08, A44B18/00F8B, B29C59/02C2
Legal Events
DateCodeEventDescription
Apr 1, 1988AS02Assignment of assignor's interest
Owner name: INTERNATIONAL KNITLOK CORPORATION
Owner name: VELCRO INDUSTRIES B.V., NEIUWE WETERINGSTRAAT 38,
Effective date: 19870930
Apr 1, 1988ASAssignment
Owner name: VELCRO INDUSTRIES B.V., NEIUWE WETERINGSTRAAT 38,
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:INTERNATIONAL KNITLOK CORPORATION;REEL/FRAME:004846/0952
Effective date: 19870930
Owner name: VELCRO INDUSTRIES B.V.,NETHERLANDS
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:INTERNATIONAL KNITLOK CORPORATION;REEL/FRAME:4846/952
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:INTERNATIONAL KNITLOK CORPORATION;REEL/FRAME:004846/0952