US3763640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of a composite thread
Assignee: Akzona Inc
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Filing: 1970-02-19
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Granted: 1973-10-09
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Expires: 1990-02-19
Abstract
Abstract Process of producing a composite thread in which at least one multifilament thread is run freely and substantially perpendicularly onto a core thread being drawn through a falsetwist interval, such that the multifilament thread forms a sheath of at least partially separated filaments wrapped around the core thread, at least one of the core and sheath threads being heatfixed or heat-set while in a twisted state. The product of the invention is a composite thread exhibiting the properties of natural fibers, especially wool-like properties, with relatively large variations in texture and crimping characteristics. The apparatus of the invention includes, in addition to conventional false-twist means for the core thread, a delivery means to supply at least one additional multifilament thread in a free path substantially perpendicularly onto the core thread in its falsetwist interval.
Inventors
- 👤 M Nagel
- 👤 R Seuss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:47
CPC Classifications
D; D02; D02G; D02G1/00; D02G1/02; D02G1/0206; D02G1/024; D02G3/00; D02G3/22; D02G3/38
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
109 words
A process for the production of a composite thread which comprises conducting a multifilament core thread through a false twist interval, supplying at least one additional multifilament thread to run freely onto said core thread within the false twist interval in a direction which is approximately perpendicular to the axis of the core thread, thereby forming a sheath composed of at least partially separated individual filaments which are spread out with a fluctuating angular displacement along the axis of the core thread as these individual filaments are wrapped around said core thread, and heat fixing at least one of said core and sheath threads while in a twisted state.
Claim 2
Dependent Claim
109 words
A process for the production of a composite thread which comprises conducting a multifilament core thread through a false twist interval, supplying at least one additional multifilament thread to run freely onto said core thread within the false twist interval in a direction which is approximately perpendicular to the axis of the core thread, thereby forming a sheath composed of at least partially separated individual filaments which are spread out with a fluctuating angular displacement along the axis of the core thread as these individual filaments are wrapped around said core thread, and heat fixing at least one of said core and sheath threads while in a twisted state.
Claim 3
Dependent Claim
21 words
A process as claimed in claim 1 wherein said at least one additional multifilament thread is supplied with substantially zero twist.
Claim 4
Dependent Claim
36 words
A process as claimed in claim 1 wherein said at least one additional multifilament thread is supplied with a preliminary twist in which the twist factor Alpha m dOes not substantially exceed a value of 30.
Claim 5
Dependent Claim
38 words
A process as claimed in claim 1 wherein a single multifilament thread being supplied as a sheath thread is drawn off from a supply source solely by the twisting of the core thread in the false twist interval.
Claim 6
Dependent Claim
32 words
A process as claimed in claim 1 wherein said at least one additional multifilament thread is positively delivered onto said core thread at an overfeed rate of approximately 10 to 120 percent.
Claim 7
Dependent Claim
17 words
A process as claimed in claim 5 wherein said overfeed rate is approximately 15 to 100 percent.
Claim 8
Dependent Claim
28 words
A process as claimed in claim 5 wherein the rate of delivery of said at least one additional multifilament thread is fluctuated in a predetermined and controlled pattern.
Claim 9
Dependent Claim
64 words
A process as claimed in claim 1 wherein the core thread is heated for fixation in a first zone of the false twist interval and said at least one additional multifilament thread is run freely onto said core thread at a location intermediate said first zone and the end portion of the false twist interval at which twist is applied to the core thread.
Claim 10
Dependent Claim
47 words
A process as claimed in claim 1 wherein the core thread is heated for fixation in an intermediate zone of the false twist interval and said at least one additional multifilament thread is run freely onto said core thread before its entry into said intermediate heating zone.
Claim 11
Dependent Claim
28 words
A process as claimed in claim 1 wherein a plurality of sheathing threads are run freely onto said core thread at separate locations along the false twist interval.
Claim 12
Dependent Claim
21 words
A process as claimed in claim 1 wherein at least one sheathing thread is heated before running onto said core thread.
Claim 13
Dependent Claim
31 words
A process as claimed in claim 1 wherein the composite thread emerging from the false twist interval is collected on a winding with a relaxation of about 3 to 30 percent.
Claim 14
Dependent Claim
32 words
A process as claimed in claim 1 wherein the composite thread emerging from the false twist interval is subsequently twisted to a final twist factor Alpha m of about 38 to 100.
Claim 15
Dependent Claim
20 words
A process as claimed in claim 13 wherein said final twist factor Alpha m amounts to about 45 to 90.
Claim 16
Dependent Claim
25 words
A process as claimed in claim 13 wherein the composite thread is reheated for at least partial resetting in conjunction with said subsequent twisting step.
Claim 17
Dependent Claim
160 words
Apparatus for the production of a composite thread comprising a false twist spindle, delivery means to feed a multifilament core thread in a substantially linear path to said false twist spindle, twist stopper means to hold a false twist in said core thread in a freely supported interval between said delivery means and said false twist spindle, and a second delivery means to feed at least one additional multifilament sheath thread in a free linear path approximately perpendicular to the linear path of said core thread such that said at least one additional multifilament thread is taken up by the core thread within its freely supported false twist interval, each of said delivery means being positioned with reference to said false twist spindle and twist stopper means to allow spreading of individual filaments of the sheath thread with a fluctuating angular displacement along the axis of the core thread as said sheath thread is taken up by the core thread.
Claim 18
Dependent Claim
160 words
Apparatus for the production of a composite thread comprising a false twist spindle, delivery means to feed a multifilament core thread in a substantially linear path to said false twist spindle, twist stopper means to hold a false twist in said core thread in a freely supported interval between said delivery means and said false twist spindle, and a second delivery means to feed at least one additional multifilament sheath thread in a free linear path approximately perpendicular to the linear path of said core thread such that said at least one additional multifilament thread is taken up by the core thread within its freely supported false twist interval, each of said delivery means being positioned with reference to said false twist spindle and twist stopper means to allow spreading of individual filaments of the sheath thread with a fluctuating angular displacement along the axis of the core thread as said sheath thread is taken up by the core thread.
Claim 19
Dependent Claim
40 words
Apparatus as claimed in claim 16 wherein said second delivery means is arranged sufficiently far from said core thread to provide a free path of each additional multifilament thread up to the core thread of at least about 30 mm.
Claim 20
Dependent Claim
16 words
Apparatus as claimed in claim 17 wherein said free path amounts to at least 100 mm.
Claim 21
Dependent Claim
33 words
Apparatus as claimed in claim 16 including thread heating means located between at least one of said delivery means and the point at which the core thread takes up an additional multifilament thread.
Claim 22
Dependent Claim
30 words
Apparatus as claimed in claim 16 including thread heating means located between said false twist spindle and the point at which the core thread takeS up an additional multifilament thread.
Claim 23
Dependent Claim
30 words
Apparatus as claimed in claim 16 including means to collect the composite thread emerging from said false twist spindle and means to impart a subsequent twist to the composite thread.
Claim 24
Dependent Claim
66 words
Apparatus as claimed in claim 16 wherein said delivery means is positioned below said false twist spindle such that the multifilament core thread is fed in a substantially vertical linear path from the delivery means upwardly to said false twist spindle, and wherein said second delivery means is positioned to feed its additional multifilament thread in a substantially horizontal free linear path onto said core thread.
Claim 25
Dependent Claim
42 words
Apparatus as claimed in claim 22 wherein thread heating means are located along said vertical linear path of said core thread above said delivery means and below the point at which said additional multifilament thread is taken up by the core thread.
Claim 26
Dependent Claim
35 words
Apparatus as claimed in claim 23 wherein said second delivery means is positioned to provide a free horizontal path of said additional multifilament thread up to the core thread of at least about 30 mm.
Claim 27
Dependent Claim
24 words
A process as claimed in claim 1 wherein said core thread is conducted in a substantially vertical path upwardly through said false twist interval.
Claim 28
Dependent Claim
60 words
A process as claimed in claim 25 wherein said core thread is heated in a first zone of the vertical false twist interval and said additional multifilament thread is run freely onto said core thread at a location between the heated portion and the end portion of the false twist interval at which twist is applied to the core thread.
Claim 29
Dependent Claim
26 words
A process as claimed in claim 26 wherein said additional multifilament thread is supplied at a twist factor Alpha m of not more than about 30.
Claim 30
Dependent Claim
29 words
A process as claimed in claim 27 wherein said additional multifilament thread is positively delivered onto said core thread at an overfeed rate of approximately 10 to 120 percent.
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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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |