US4164837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming a wrapped yarn
Assignee: Hoechst AG
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Filing: 1976-12-20
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Granted: 1979-08-21
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Expires: 1996-12-20
Abstract
Abstract A yarn is described composed of an untwisted staple sliver and of at least one filament wound around this sliver.
Inventors
- 👤 Fritjof Maag
- 👤 Friedrich Unger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:47
CPC Classifications
D; D02; D02G; D02G3/00; D02G3/22; D02G3/38; D02G3/385
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
183 words
A process for the manufacture of a wrapped yarn of the type in which a bundle of staple fibers is passed through the hollow shaft of a rotating bobbin carrying a filamentary yarn and the yarn is withdrawn from the bobbin and led to the longitudinally moving fiber bundle, whereby rotation of the bobbin causes the fiber bundle to be wrapped with the filamentary yarn in a helical configuration, said process comprising the steps of winding said fiber bundle with a filamentary yarn having (a) a denier of 1 to 50 dtex, (b) an elongation at break greater than the elongation at break of the fibers of said bundle, whereby when the yarn is stretched the winding yarn does not break until after the core fibers break and (c) a modulus such that a force of at least 10 grams is required to produce an elongation of 4% and maintaining a tension of no more than 5 grams on said winding yarn during said winding operation, whereby the core fibers are rapidly squeezed together by the winding yarn when wrapped yarn is stretched.
Claim 2
Dependent Claim
183 words
A process for the manufacture of a wrapped yarn of the type in which a bundle of staple fibers is passed through the hollow shaft of a rotating bobbin carrying a filamentary yarn and the yarn is withdrawn from the bobbin and led to the longitudinally moving fiber bundle, whereby rotation of the bobbin causes the fiber bundle to be wrapped with the filamentary yarn in a helical configuration, said process comprising the steps of winding said fiber bundle with a filamentary yarn having (a) a denier of 1 to 50 dtex, (b) an elongation at break greater than the elongation at break of the fibers of said bundle, whereby when the yarn is stretched the winding yarn does not break until after the core fibers break and (c) a modulus such that a force of at least 10 grams is required to produce an elongation of 4% and maintaining a tension of no more than 5 grams on said winding yarn during said winding operation, whereby the core fibers are rapidly squeezed together by the winding yarn when wrapped yarn is stretched.
Claim 3
Dependent Claim
27 words
A process according to claim 1 wherein the tension of the wrapped yarn during winding is from 10 to 100 times the tension of the winding filament.
Claim 4
Dependent Claim
33 words
A process according to claim 1 wherein the staple fibers of the fiber bundle have different shrinking properties and shrinkage is initiated after the winding operation but prior to spooling of the yarn.
Claim 5
Dependent Claim
21 words
A process according to claim 1 that includes the additional step of heat setting the wrapped yarn before it is spooled.
Claim 6
Dependent Claim
20 words
A process according to claim 1 that includes the additional step of paraffinizing the wrapped yarn before it is spooled.
Claim 7
Dependent Claim
13 words
A process according to claim 1 wherein the winding filament is a multi-filament.
Claim 8
Dependent Claim
13 words
A process according to claim 1 wherein the winding filament is a mono-filament.
Claim 9
Dependent Claim
98 words
A process for the manufacture of a wrapped yarn which comprises continuously passing a bundle of stretched, highly oriented staple fibers longitudinally through the hollow shaft of a rotating bobbin carrying a filamentary yarn of 1 to 50 dtex, withdrawing the filamentary yarn from the bobbin and leading it to the longitudinally moving fiber bundle whereby rotation of the bobbin causes the fiber bundle to be wrapped with the filamentary yarn in a helical configuration, and limiting ballooning of the filament as it unwinds from the bobbin by means of a cylindrical retainer that rotates with the bobbin.
Claim 10
Dependent Claim
98 words
A process for the manufacture of a wrapped yarn which comprises continuously passing a bundle of stretched, highly oriented staple fibers longitudinally through the hollow shaft of a rotating bobbin carrying a filamentary yarn of 1 to 50 dtex, withdrawing the filamentary yarn from the bobbin and leading it to the longitudinally moving fiber bundle whereby rotation of the bobbin causes the fiber bundle to be wrapped with the filamentary yarn in a helical configuration, and limiting ballooning of the filament as it unwinds from the bobbin by means of a cylindrical retainer that rotates with the bobbin.
Claim 11
Dependent Claim
97 words
A process for the manufacture of a wrapped yarn which comprises the steps of passing a bundle of staple fibers longitudinally through the hollow shaft of a rotating bobbin that is internally wound with a filamentary yarn of 1 to 50 dtex, withdrawing said filamentary yarn from the interior of said bobbin at a tension of no more than 5 grams, and leading it to the longitudinally moving fiber bundle within the hollow shaft of the bobbin whereby rotation of the bobbin causes the fiber bundle to be wrapped with the filamentary yarn in a helical configuration.
Claim 12
Dependent Claim
97 words
A process for the manufacture of a wrapped yarn which comprises the steps of passing a bundle of staple fibers longitudinally through the hollow shaft of a rotating bobbin that is internally wound with a filamentary yarn of 1 to 50 dtex, withdrawing said filamentary yarn from the interior of said bobbin at a tension of no more than 5 grams, and leading it to the longitudinally moving fiber bundle within the hollow shaft of the bobbin whereby rotation of the bobbin causes the fiber bundle to be wrapped with the filamentary yarn in a helical configuration.
References Cited (Backward Citations)
FR1270065A
Cited
US3438193A
Cited
FR1455498A
Cited
US3328946A
Cited
US3577718A
Cited
US3643416A
Cited
US3717959A
Cited
US3769787A
Cited
US3831369A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-08-20 | 1983-02-19 | 1983-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-20 | 1987-02-19 | 1987-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-20 | 1991-02-19 | 1991-08-21 | $7700.00 | Window Closed / Lapsed |