Patent US4414800A successfully refreshed from Google Patents.
US4414800A
Expired / Lapsed
US
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Twisted yarn and method of producing the same
Assignee: Toray Industries Inc
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Filing: 1981-03-31
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Granted: 1983-11-15
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Expires: 2001-03-31
Abstract
Abstract Disclosed herein is a twisted yarn comprising at least two bundled sheaves of staple fibers, each sheaf having an initial twist of substantially zero, the sheaves of staple fibers being mutually twisted to form the yarn. The coefficient of finishing twist utilization as defined in the specification is at least 150%. Also disclosed is a method of producing a twisted yarn comprising drafting a sheaf of staple fibers, supplying the sheaf to a bundling zone to reduce it to a bundled sheaf having an initial twist of substantially zero, drafting another sheaf in a similar manner, doubling at least two such bundled sheaves of staple fibers, and twisting them together.
Inventors
- 👤 Takashi Nakayama
- 👤 Seiichi Yamagata
- 👤 Koji Kajita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:20
CPC Classifications
D; D02; D02G; D02G3/00; D02G3/22; D02G3/26; D02G3/28; D02G3/281; D01; D01H; D01H7/00; D01H7/02; D01H7/90
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
93 words
A twisted yarn comprising at least two bundled sheaves of staple fibers, each said sheaf having a core having an initial twist of substantially zero and having wrapping fibers wrapped around said core, said sheaves being twisted upon each other, and said twisted yarn product having a coefficient of finishing twist utilization greater than 150%, said coefficient of finishing twist utilization (RF) being defined by the formula, ##EQU4## where STy represets the strength of the twisted yarn and SUTy represents the strength of the yarn after detwisting the finishing twist of the yarn.
Claim 2
Dependent Claim
93 words
A twisted yarn comprising at least two bundled sheaves of staple fibers, each said sheaf having a core having an initial twist of substantially zero and having wrapping fibers wrapped around said core, said sheaves being twisted upon each other, and said twisted yarn product having a coefficient of finishing twist utilization greater than 150%, said coefficient of finishing twist utilization (RF) being defined by the formula, ##EQU4## where STy represets the strength of the twisted yarn and SUTy represents the strength of the yarn after detwisting the finishing twist of the yarn.
Claim 3
Dependent Claim
21 words
A twisted yarn according to claim 1 wherein the coefficient of finishing twist utilization of the yarn is more than 200%.
Claim 4
Dependent Claim
21 words
A twisted yarn according to claim 1 wherein the coefficient of finishing twist utilization of the yarn is more than 250%.
Claim 5
Dependent Claim
52 words
A twisted yarn according to claim 1 wherein said yarn has a twist constant of from 25 to 60 wherein said twist constant (K) is defined by the formula K=T/√N where T represents the finishing twist number and N represents the yarn count number of the twisted yarn using the metric systems.
Claim 6
Dependent Claim
17 words
A twisted yarn yarn according to claim 4 wherein said twist constant is from 35 to 45.
Claim 7
Dependent Claim
37 words
A twisted yarn according to claim 1 wherein said wrapping fibers are a plurality of binding staple fibers wrapped around said core and each sheaf comprises staple fibers arranged substantially parallel to the axis of said sheaf.
Claim 8
Dependent Claim
21 words
A twisted yarn according to claim 1 wherein at least one of said bundled sheaves contains at least one crimped filament.
Claim 9
Dependent Claim
15 words
A twisted yarn according to claim 1 wherein said wrapping fibers are distributed only locally.
Claim 10
Dependent Claim
30 words
A twisted yarn according to claim 1 wherein the portions in which said wrapping fibers are present along the longitudinal axis of the yarn is not greater than about 50%.
Claim 11
Dependent Claim
30 words
A twisted yarn according to claim 9, wherein the portions in which said wrapping fibers are present along the longitudinal axis of the yarn is not greater than about 30%.
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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) | 1986-11-14 | 1987-05-16 | 1987-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-14 | 1991-05-16 | 1991-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-14 | 1995-05-16 | 1995-11-15 | $7700.00 | Window Closed / Lapsed |