US3645819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacturing synthetic multicore elements
Assignee: Toray Industries Inc
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Filing: 1968-03-13
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Granted: 1972-02-29
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Expires: 1988-03-13
Abstract
Abstract A method for manufacturing improved synthetic bonded filament yarn by forming a unit composite from matrix and island components, assembling a plurality of the unit composites into a randomly bundled multifilament yarn and heating the multifilament yarn at a temperature between the melting points of both components. The cross section of the unit composite can be obtained in any of so-called sheath-core configuration, randomly distributed configuration and bimetallike configuration of the components. The bonded filament yarn has excellent flexibility and a unique surface condition having many wrinkles thereon and the bonded filament yarn of the present invention can be advantageously used for numerous industrial uses such as chafer fabrics of tires, bowstrings, fishing nets, guts of rackets, etc.
Inventors
- 👤 Shigeru Fujii
- 👤 Takashi Miwa
- 👤 Kazushige Noji
- 👤 Chikatsu Okagawa
- 👤 Masamichi Toki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:49
CPC Classifications
A; A63; A63B; A63B51/00; A63B51/02; B; B60; B60C; B60C15/00; B60C15/06; B60C9/00; B60C9/0028; B60C9/0042; D; D01; D01D; D01D5/00; D01D5/28; D01D5/30; D01D5/36; D02; D02G; D02G3/00; D02G3/22; D02G3/40; D02G3/402; Y; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495; Y10T152/10819; Y10T152/10828
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
42 words
A method according to claim 1, wherein said synthetic polymeric materials are selected from a group consisting of polycaprolactam, polyhexamethylEne-adipamide, polyethylene terephthalate, polypropylene, polyethylene, polyacetal, polyvinylchloride, polystyrene, copolymer of these polymers, blended polymers of said polymers, and block copolymers of said polymers.
Claim 2
Dependent Claim
36 words
A method according to claim 1, wherein the combination of said sheath component and core component polymeric materials is selected from a group consisting of sheath-forming polycaprolactam with core-forming polyhexamethylene-adipamide and sheath-forming polycaprolactam with core-forming polyethylene-terephthalate.
Claim 3
Dependent Claim
28 words
A method according to claim 1, wherein said melting point temperature of said core component is higher than that of said sheath component by at least 15* C.
Claim 4
Dependent Claim
24 words
A method according to claim 4, wherein said core component is composed of nylon 66 and said sheath component is composed of nylon 6.
Claim 5
Dependent Claim
58 words
A method according to claim 5, wherein the degrees of polymerization of said two polymeric materials are defined by the following formula: P66 0.23P6+51.5 P66 0.29P6+28.0 150< P<300 wherein P66 upper limit value of degree of polymerization of nylon 66 P66 lower limit value of degree of polymerization of nylon 66 P6 degree of polymerization of nylon 6.
Claim 6
Dependent Claim
25 words
A method according to claim 1, wherein said heat-treating step includes maintaining said twisted bundle of multifilament composites free of slack during their heat treatment.
Claim 7
Dependent Claim
40 words
A method according to claim 1 including heat-treating said twisted bundle of multifilament composites at a low enough temperature to develop a plurality of air pockets in said common matrix component to effectively increase the flexibility of the multicore filament.
Claim 8
Dependent Claim
21 words
A method according to claim 1 further including weaving a plurality of said multicore filaments into a tubeless tire chafer strip.
Claim 9
Independent Claim
155 words
A method of manufacturing a tubeless tire reinforcing chafer strip composed of synthetic multicore filaments comprising: providing a plurality of individual filament composites each comprising a core component composed of synthetic polymeric material having a given melting point temperature and a sheath component surrounding said core component composed of synthetic polymeric material having a melting point temperature lower than said given melting point temperature; bundling together said plurality of individual filament composites to form a bundle of multifilament composites; imparting from 50 to 500 twists per meter length to said bundle of multifilament composites; weaving a plurality of such bundles of multifilament composites into a chafer strip configuration; and heat-treating said chafer strip at a temperature between the melting point temperatures of said core and sheath components for a sufficient time to effect melting of individual ones of said sheath components of each twisted bundle into a common matrix component containing therein said core components.
Claim 10
Dependent Claim
34 words
A method according to claim 10 including, prior to said heat-treating step, disposing said chafer strip within a tubeless tire; and wherein said heat-treating step is carried out during vulcanization of said tubeless tire.
Claim 11
Independent Claim
126 words
A method of manufacturing synthetic multicore filaments comprising: providing a plurality of bundles of filaments wherein each bundle comprises a first plurality of filaments composed of synthetic polymeric material having a given melting point temperature and a second plurality of core filaments composed of synthetic polymeric material having a melting point temperature lower than said given melting point temperature randomly interspersed with said first plurality of filaments; twisting together said plurality of bundles of filaments to obtain a multifilament composite; and heat-treating said multifilament composite at a temperature between the melting point temperatures of said first and second pluralitIes of filaments for a sufficient time to effect melting of said second plurality of filaments into a common matrix component containing uniformly dispersed therein said core filaments.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |