US3846532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous spinning and stretching process of the production of polyamide-6 filaments
Assignee: Bayer AG
•
Filing: 1971-03-01
•
Granted: 1974-11-05
•
Expires: 1991-03-01
Abstract
Abstract A stretched polyamide-6-filament consisting of a polyamide-6, having a monoclinic structure, a Cu-K -X-ray reflection width measured in the half height of the equator reflection - of at least 2.35* corresponding to an angular distance of the (200) and (020) reflex of 0.8* and an infra-red extinction ratio E833/E1075 of 13. The polyamide-6-filament is prepared by a continuous spinning and stretching process which comprises the following steps : (a) dressing the filaments spun from the polyamide-6 melt immediately after they have been cooled with a non-ionic, high temperature resistant dressing agent, (b) drawing off under transposition, (c) stretching the filaments over stretching rollers, and (d) winding up the stretched filaments under tension.
Inventors
- 👤 A Reichle
- 👤 H Kubitzker
- 👤 B Falkai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:29
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/60
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
16 words
A CONTINUOUS PROCESS FOR THE PRODUCTION OF STRETCHED POLYAMIDE-6 FILAMENT CONSISTING OF THE SEQUENTIAL STEPS OF
Claim 2
Dependent Claim
16 words
A CONTINUOUS PROCESS FOR THE PRODUCTION OF STRETCHED POLYAMIDE-6 FILAMENT CONSISTING OF THE SEQUENTIAL STEPS OF
Claim 3
Dependent Claim
6 words
SPINNING POLYAMIDE-6 FILAMENT FROM A MELT;
Claim 4
Dependent Claim
6 words
SPINNING POLYAMIDE-6 FILAMENT FROM A MELT;
Claim 5
Dependent Claim
4 words
COOLING THE SPUN FILAMENT;
Claim 6
Dependent Claim
4 words
COOLING THE SPUN FILAMENT;
Claim 7
Dependent Claim
4 words
cooling the spun filament;
Claim 8
Dependent Claim
4 words
cooling the spun filament;
Claim 9
Dependent Claim
20 words
The process of claim 1, wherein the stretching step (5) is carried out using a heated pair of stretching rollers.
Claim 10
Dependent Claim
21 words
The process of claim 1, wherein the stretching step (5) is carried out using a heated stretching roller with auxillary roller.
Claim 11
Dependent Claim
25 words
dressing the filament immediately after cooling with 0.4 to 0.8 percent by weight of a non-ionic dressing agent which is temperature resistant up to 220*C;
Claim 12
Dependent Claim
25 words
dressing the filament immediately after cooling with 0.4 to 0.8 percent by weight of a non-ionic dressing agent which is temperature resistant up to 220*C;
Claim 13
Dependent Claim
25 words
DRESSING THE FILAMENT IMMEDIATELY AFTER COOLING WITH 0.4 TO 0.8 PERCENT BY WEIGHT OF A NON-IONIC DRESSING AGENT WHICH IS TEMPERATURE RESISTANT UP TO 220*C;
Claim 14
Dependent Claim
25 words
DRESSING THE FILAMENT IMMEDIATELY AFTER COOLING WITH 0.4 TO 0.8 PERCENT BY WEIGHT OF A NON-IONIC DRESSING AGENT WHICH IS TEMPERATURE RESISTANT UP TO 220*C;
Claim 15
Dependent Claim
12 words
DRAWING OFF THE FILAMENT OVER A DRAW-OFF ROLLER WITH A TRANSPOSITION DEVICE;
Claim 16
Dependent Claim
12 words
DRAWING OFF THE FILAMENT OVER A DRAW-OFF ROLLER WITH A TRANSPOSITION DEVICE;
Claim 17
Dependent Claim
12 words
drawing off the filament over a draw-off roller with a transposition device;
Claim 18
Dependent Claim
12 words
drawing off the filament over a draw-off roller with a transposition device;
Claim 19
Dependent Claim
21 words
The process of claim 1 in which step (4), drawing off, is conducted at a speed of 200 to 1500 m/min.
Claim 20
Dependent Claim
23 words
The process of claim 1 in which step (6), winding-up, is conducted at a rate 1-5 percent below the stretching rate, step (5).
Claim 21
Dependent Claim
19 words
stretching the filament to 2.5 to 5.5 times its length using stretching rollers heated to 170* to 220*C; and
Claim 22
Dependent Claim
19 words
stretching the filament to 2.5 to 5.5 times its length using stretching rollers heated to 170* to 220*C; and
Claim 23
Dependent Claim
19 words
STRETCHING THE FILAMENT TO 2.5 TO 5.5 TIMES ITS LENGTH USING STRETCHING ROLLERS HEATED TO 170* TO 220*C; AND
Claim 24
Dependent Claim
19 words
STRETCHING THE FILAMENT TO 2.5 TO 5.5 TIMES ITS LENGTH USING STRETCHING ROLLERS HEATED TO 170* TO 220*C; AND
Claim 25
Dependent Claim
14 words
WINDING UP THE STRETCHED FILAMENT UNDER A TENSION OF BETWEEN 0.02 TO 0.08 G/DTEX.
Claim 26
Dependent Claim
14 words
WINDING UP THE STRETCHED FILAMENT UNDER A TENSION OF BETWEEN 0.02 TO 0.08 G/DTEX.
Claim 27
Dependent Claim
14 words
winding up the stretched filament under a tension of between 0.02 to 0.08 g/dtex.
Claim 28
Dependent Claim
14 words
winding up the stretched filament under a tension of between 0.02 to 0.08 g/dtex.
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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) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |