Patent US4181697A successfully refreshed from Google Patents.
US4181697A
Expired / Lapsed
US
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Process for high-speed spinning of polyamides
Assignee: LL Plant Engineering AG
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Filing: 1978-06-08
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Granted: 1980-01-01
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Expires: 1998-06-08
Abstract
Abstract A method for draw-off of polyamide threads at very high speeds, say 1800 to 5000 m/min, while maintaining high quality threads and producing stable packages. The method comprises heat treating the threads, after an initial air-blast cooling, by passing them through a spinning duct the walls of which are heated to a preselected temperature below 140° C. and above T min . Minimum calculated from the following equation: ##EQU1## wherein v=draw-off speed in m/min, and T a is a temperature value=O for spinning ducts over 1500 mm in length, or 6° C. for each 100 mm reduction in duct length under 1500 mm. The heat treated threads are subjected to a finishing and wetting operation and then drawn off at the high speed.
Inventors
- 👤 Gunter Koschinek
- 👤 Dietmar Wandel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:22
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/60; D01D; D01D5/00; D01D5/08; D01D5/088
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
152 words
Process for high-speed spinning and take-up of polyamide spun filaments emerging from spinnerets comprising: (a) cooling the filaments to a temperature of 50°-90° C., (b) passing the cooled filaments through a steamless spinning duct the walls of which are heated to a preselected temperature below 140° C. and above T min , wherein T min is calculated from the following equation: ##EQU3## with v=draw-off speed through the spinning duct in m/min, said speed being between 1800 and 5000 m/min and wherein T a is a constant temperature value of 0 for spinning ducts 1500 mm or greater in length, and a positive constant which is a function of the length of the spinning duct for a duct length less than 1500 mm as follows: ##EQU4## (c) subjecting the heat-treated filaments to a finishing and moistening operation, and (d) subsequently drawing the filaments off at a speed of between 1800 and 5000 m/min.
Claim 2
Dependent Claim
152 words
Process for high-speed spinning and take-up of polyamide spun filaments emerging from spinnerets comprising: (a) cooling the filaments to a temperature of 50°-90° C., (b) passing the cooled filaments through a steamless spinning duct the walls of which are heated to a preselected temperature below 140° C. and above T min , wherein T min is calculated from the following equation: ##EQU3## with v=draw-off speed through the spinning duct in m/min, said speed being between 1800 and 5000 m/min and wherein T a is a constant temperature value of 0 for spinning ducts 1500 mm or greater in length, and a positive constant which is a function of the length of the spinning duct for a duct length less than 1500 mm as follows: ##EQU4## (c) subjecting the heat-treated filaments to a finishing and moistening operation, and (d) subsequently drawing the filaments off at a speed of between 1800 and 5000 m/min.
Claim 3
Dependent Claim
34 words
The process of claim 1 wherein said spun threads have a titer of 20 to 100 dtex (relative to the spun titer) and said temperature is between T min and T=T min +25° C.
Claim 4
Dependent Claim
24 words
The process of claim 1 wherein a gaseous medium is fed into said spinning duct having a temperature substantially equal to said wall temperature.
Claim 5
Dependent Claim
13 words
The process of claim 1 wherein the threads are drawn off over godets.
Claim 6
Dependent Claim
10 words
The process of claim 1 wherein said polyamide is polycaprolactam.
Claim 7
Dependent Claim
11 words
The process of claim 1 in which said polyamide is polyamide-66.
Claim 8
Dependent Claim
26 words
The process of claim 1 in step (a) is performed by subjecting said threads to an air blast having a temperature between 15° and 120° C.
Claim 9
Dependent Claim
26 words
The process of claim 1 in step (a) is performed by subjecting said threads to an air blast having a temperature between 16° and 36° C.
References Cited (Backward Citations)
FR986505A
Cited
CH357144A
Cited
US2957747A
Cited
DE2117659A1
Cited
US3987136A
Cited
US3946100A
Cited
US3994121A
Cited
US4093147A
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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) | 1982-12-31 | 1983-07-02 | 1984-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-31 | 1987-07-02 | 1988-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-31 | 1991-07-02 | 1992-01-01 | $7700.00 | Window Closed / Lapsed |