Patent US3837156A successfully refreshed from Google Patents.
US3837156A
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Process for producing molecularly oriented, textured continuous filaments
Assignee: GEA Group AG
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Filing: 1973-02-15
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Granted: 1974-09-24
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Expires: 1993-02-15
Abstract
Abstract Molecularly oriented, textured continuous filaments are made from thermoplastic materials by A. SPINNING CONTINUOUS FILAMENTS FROM A MULTI-ORIFICE SPINNERET AND DRAWING THE FILAMENTS THEREFROM WITHOUT DEFORMING SAME AT A SPEED OF AT LEAST 2,500 METERS PER MINUTE TO A RESIDUAL ELONGATION AT BREAK OF NOT GREATER THAN 200%; THEREAFTER B. CRIMPING THE PRESTRETCHED FILAMENTS FROM (A) AND FURTHER STRETCHING SAME TO A RESIDUAL ELONGATION BY A FALSE-TWISTING STEP CARRIED OUT IN THE FIRST HEATING PASSAGE OF A TEXTURING DEVICE.
Inventors
- 👤 H Langanke
- 👤 P Landenberger
- 👤 G Treutel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:22
CPC Classifications
D; D02; D02G; D02G1/00; D02G1/02; D02G1/0286
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
102 words
Process for producing synthetic textured yarn of molecularly oriented filaments which comprises a. spinning continuous filaments from a multi-orifice spinneret and at the same time winding the freshly spun filaments and thus drawing them with a longitudinal speed of at least 2,500 meters per minute to a residual elongation at break of not greater than 200% to produce a prestretched and still drawable untextured yarn; thereafter b. in a false twisting step, crimping said drawable untextured yarn and stretching it in the first heating passage of the false twisting device, the stretching being done at a draw ratio between 1.2 and 1,8.
Claim 2
Dependent Claim
102 words
Process for producing synthetic textured yarn of molecularly oriented filaments which comprises a. spinning continuous filaments from a multi-orifice spinneret and at the same time winding the freshly spun filaments and thus drawing them with a longitudinal speed of at least 2,500 meters per minute to a residual elongation at break of not greater than 200% to produce a prestretched and still drawable untextured yarn; thereafter b. in a false twisting step, crimping said drawable untextured yarn and stretching it in the first heating passage of the false twisting device, the stretching being done at a draw ratio between 1.2 and 1,8.
Claim 3
Dependent Claim
30 words
Process of claim 1 wherein the filaments are drawn at a velocity of about 3,000-4,000 meters per minute to an elongation at break less than 150% down to about 90%.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |