Patent US3706192A successfully refreshed from Google Patents.
US3706192A
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Process and apparatus for false twisting synthetic yarns
Assignee: Akzona Inc
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Filing: 1970-10-08
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Granted: 1972-12-19
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Expires: 1990-10-08
Abstract
Abstract A system is provided to false twist and simultaneously draw a linear synthetic high polymer yarn. The yarn is first heated and then false twisted in a novel false twister wherein the diameter of the twisting chamber is considerably greater than the yarn feeding and discharge channels.
Inventors
- 👤 Bertus Leibbrand
- 👤 Johan J Mertens
- 👤 Harm A Ploeger
- 👤 Robert Sluijters
- 👤 Leendert Van Assendelft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:21
CPC Classifications
D; D02; D02G; D02G1/00; D02G1/02; D02G1/0206; D02G1/0266; D02G1/04; D02J; D02J1/00; D02J1/22
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
99 words
Apparatus for false twisting synthetic yarns which comprises yarn feeding means and yarn drawing means for transporting the yarn from a source of supply to a take-up device, a pneumatic false twister formed with a cylindrical chamber and provided with means to supply compressed air in a tangential direction along the circumference of the chamber, feed and discharge channels rigidly mounted on each end of the chamber, the inside diameter of the chamber being substantially greater than the inside diameter of the channels, and the length of each channel being at least 10 times that of their inside diameter.
Claim 2
Dependent Claim
99 words
Apparatus for false twisting synthetic yarns which comprises yarn feeding means and yarn drawing means for transporting the yarn from a source of supply to a take-up device, a pneumatic false twister formed with a cylindrical chamber and provided with means to supply compressed air in a tangential direction along the circumference of the chamber, feed and discharge channels rigidly mounted on each end of the chamber, the inside diameter of the chamber being substantially greater than the inside diameter of the channels, and the length of each channel being at least 10 times that of their inside diameter.
Claim 3
Dependent Claim
29 words
Apparatus according to claim 1 in which the inside diameter of the chamber is at least 1.2 to 1.5 times the inside diameter of the feed and discharge channels.
Claim 4
Dependent Claim
25 words
Apparatus according to claim 1 in which the length of the feed and discharge channels is 25 to 150 times that of their inside diameter.
Claim 5
Dependent Claim
19 words
Apparatus according to claim 1 which further comprises a mechanical false twister disposed downstream of the pneumatic false twister.
Claim 6
Dependent Claim
29 words
Apparatus according to claim 4 in which the pneumatic false twister and the mechanical false twister are both located between the yarn feeding means and the yarn drawing means.
Claim 7
Dependent Claim
20 words
Apparatus according to claim 1 which further comprises heating means disposed between the yarn feeding means and the false twister.
Claim 8
Dependent Claim
22 words
Apparatus according to claim 6 in which the distance between the pneumatic false twister and the heating means is approximately 20-35 mm.
Claim 9
Dependent Claim
28 words
Apparatus according to claim 1 which further comprises a shield or baffle disposed between the pneumatic false twister and the heating means to provide passage for the yarn.
Claim 10
Dependent Claim
26 words
Apparatus according to claim 1 which further comprises a narrow discharge opening at or near the circumference of the chamber wall of the pneumatic false twister.
Claim 11
Dependent Claim
45 words
Apparatus according to claim 9 in which the narrow discharge opening is connected to a collecting space located at a larger radial distance from the center of the chamber, the collecting space being in open communication with the ambient atmosphere via the narrow discharge opening.
Claim 12
Dependent Claim
66 words
A process for treatment of synthetic yarn while transporting yarn from a source of yarn supply through a drawing zone to a collection zone, comprising the steps of sequentially heating, cooling and false twisting the yarn in the drawing zone, the false twisting being achieved by forming a forced vortex of air around the yarn and increasing the angular velocity of rotation of the forced vortex.
Claim 13
Dependent Claim
66 words
A process for treatment of synthetic yarn while transporting yarn from a source of yarn supply through a drawing zone to a collection zone, comprising the steps of sequentially heating, cooling and false twisting the yarn in the drawing zone, the false twisting being achieved by forming a forced vortex of air around the yarn and increasing the angular velocity of rotation of the forced vortex.
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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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |