Patent US4445851A successfully refreshed from Google Patents.
Patent US3983687A successfully refreshed from Google Patents.
US3983687A
Expired / Lapsed
US
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Method of producing covered elastic yarn
Assignee: Akzo Nobel UK PLC
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Filing: 1975-04-10
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Granted: 1976-10-05
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Expires: 1995-04-10
Abstract
Abstract A method of producing an elastic yarn comprising preparing a covered unstabilised elastic yarn, transferring the yarn to a heat treatment machine, unwinding the yarn from a package, drafting the covered elastic yarn to extend it, and heating the covered elastic yarn whilst it is being drafted to set it in an extended state. The elastic yarn may have one covering yarn or two covering yarns applied separately, and the or each covering yarn may be a polyamide yarn.
Inventors
- 👤 George Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:24
CPC Classifications
D; D02; D02G; D02G3/00; D02G3/22; D02G3/32; D02G3/328; D02G3/322
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
175 words
A method of producing a covered elastic yarn comprising the steps of covering an unstabilised elastic polymeric core yarn by passing the yarn through a winding station whilst winding a heat-shrinkable continuous filament covering yarn thereon, and collecting the covered yarn, and thereafter transferring the covered unstabilised yarn to a heat treatment machine, unwinding the covered unstabilised yarn from a package and passing the yarn through said machine wherein it is concurrently subjected to a drafting action, to draw the core yarn and reduce its tex count, and to a heating action, of less than 1 second duration, to stabilise the core yarn and set it temporarily to a desired tex count at least 10 percent lower than the tex count of the unstabilised core, said drafting action extending the core yarn to at least 150 percent of its unextended length and, with the heating action, reducing the elongation to break of said yarn to 150 percent or less, and said heating action producing a shrinkage in said covering yarn of at least 5 percent.
Claim 2
Independent Claim
175 words
A method of producing a covered elastic yarn comprising the steps of covering an unstabilised elastic polymeric core yarn by passing the yarn through a winding station whilst winding a heat-shrinkable continuous filament covering yarn thereon, and collecting the covered yarn, and thereafter transferring the covered unstabilised yarn to a heat treatment machine, unwinding the covered unstabilised yarn from a package and passing the yarn through said machine wherein it is concurrently subjected to a drafting action, to draw the core yarn and reduce its tex count, and to a heating action, of less than 1 second duration, to stabilise the core yarn and set it temporarily to a desired tex count at least 10 percent lower than the tex count of the unstabilised core, said drafting action extending the core yarn to at least 150 percent of its unextended length and, with the heating action, reducing the elongation to break of said yarn to 150 percent or less, and said heating action producing a shrinkage in said covering yarn of at least 5 percent.
Claim 3
Dependent Claim
31 words
A method as claimed in claim 1 wherein the covering yarn relaxes to the extent of from 5 to 10 percent based on its unextended length before subjection to the heating.
Claim 4
Dependent Claim
22 words
A method as claimed in claim 2 wherein the covering yarn is a polyamide yarn and the core yarn is segmented polyurethane.
Claim 5
Dependent Claim
19 words
A method as claimed in claim 3 wherein said heating action has a duration of less than 0.3 second.
Claim 6
Dependent Claim
28 words
A method as claimed in claim 4 wherein the covered elastic yarn is heated by contact with a metal plate at a temperature of from 195°C to 245°C.
Claim 7
Dependent Claim
22 words
A method as claimed in claim 3, wherein the core yarn is stretched during the covering operation by more than 200 percent.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-05 | 1980-04-05 | 1980-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-05 | 1984-04-05 | 1984-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-05 | 1988-04-05 | 1988-10-05 | $7700.00 | Window Closed / Lapsed |