US3920784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing crimped fibers
Assignee: Kuraray Co Ltd
•
Filing: 1972-08-29
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Granted: 1975-11-18
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Expires: 1992-08-29
Abstract
Abstract Crimped filaments of which cross sectional shape consists of a substantially circular basic part and two or three projections therefrom, said projections being located on one semicircumference of the circular basic part and satisfying the specific Alpha and A/B values, parameters therefor. Filaments having such a novel structure have good crimp characteristics. The filaments are produced by the specific non-symmetrical quenching process.
Inventors
- 👤 Junyo Nakagawa
- 👤 Yoshikata Ohno
- 👤 Tamemaru Esaki
- 👤 Keizo Ueda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:30
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/22; D01D5/23; D01D5/253; C; C10; C10M; C10M2201/00; C10M2201/02; C10M2201/14; C10M2207/00; C10M2207/10; C10M2207/12; C10M2207/125; C10M2207/129; C10M2209/00; C10M2209/10; C10M2209/103; C10M2209/105; C10M2209/109; C10M2227/00; C10M2227/08; C10M2227/083; C10M2227/09; C10N; C10N2010/00; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2922
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
193 words
A METHOD OF PRODUCING FIBERS AND FILAMENT BY SPINNING A MELT OF A FIBER-FORMING ORGANIC LINEAR SYNTHETIC POLYMER THROUGH A SPINNERET HAVING ANUMBER OF ORIFICES, CHARACTERIZED IN THAT EACH ORIFICE COMPRISES A SUBSTANTIALLY CIRCULAR MAIN HOLE AND TWO OR THREE SUBHOLES HAVING SMALLER SIZES THAN THE MAIN HOLE AND PROVIDED IN PROXIMITY TO THE SURROUNDING OFTHE MAIN HOLE, SAID SUBHOLES AT LEAST CONTAINING A STANDARD SUBHOLE AND AN ADJACENT SUBHOLE, THE STANDARD SUBHOLE, HAVING AN AREA NOT SMALLER THAN THAT OF THE OTHER SUBHOLE, THE CENTRAL ANGLE A'' FORMED BETWEEN THE STANDARD SUBHOLE AND THE ADJACENT SUBHOLE WTH RESPECT TO THE CENTER OF THE MAIN HOLE BEING 45* & A'' & 135*., AND WHEN THE NUMBER OF THE SUNHOLES IT THREE, THESE THREE SUBHOLES BEING PROVIDED IN PROXIMITY TO ONE SEMICIRCUMFERENCE OF THE MAIN HOLE; A COOLING AIR IS BLOWN AGAINST THE FILAMENTS EXTRUDED FROM A SPINNERET AT SUBSTANTIALLY RIGHT ANGLES TO THE INDIVIDUAL FILAMENTS WITHIN A REGION 45 TO 380 MM BELOW THE SPINNERET FACE, THE DIRECTION OF BLOWING THE COLD AIR BEING IN SUBSTANTIAL CORRESPONDENCE WITH THE DIRECTION CONNECTING THE CENTER OF THE MAIN HOLE WITH THAT OF THE STANDARD SUBHOLE.
Claim 2
Independent Claim
193 words
A METHOD OF PRODUCING FIBERS AND FILAMENT BY SPINNING A MELT OF A FIBER-FORMING ORGANIC LINEAR SYNTHETIC POLYMER THROUGH A SPINNERET HAVING ANUMBER OF ORIFICES, CHARACTERIZED IN THAT EACH ORIFICE COMPRISES A SUBSTANTIALLY CIRCULAR MAIN HOLE AND TWO OR THREE SUBHOLES HAVING SMALLER SIZES THAN THE MAIN HOLE AND PROVIDED IN PROXIMITY TO THE SURROUNDING OFTHE MAIN HOLE, SAID SUBHOLES AT LEAST CONTAINING A STANDARD SUBHOLE AND AN ADJACENT SUBHOLE, THE STANDARD SUBHOLE, HAVING AN AREA NOT SMALLER THAN THAT OF THE OTHER SUBHOLE, THE CENTRAL ANGLE A'' FORMED BETWEEN THE STANDARD SUBHOLE AND THE ADJACENT SUBHOLE WTH RESPECT TO THE CENTER OF THE MAIN HOLE BEING 45* & A'' & 135*., AND WHEN THE NUMBER OF THE SUNHOLES IT THREE, THESE THREE SUBHOLES BEING PROVIDED IN PROXIMITY TO ONE SEMICIRCUMFERENCE OF THE MAIN HOLE; A COOLING AIR IS BLOWN AGAINST THE FILAMENTS EXTRUDED FROM A SPINNERET AT SUBSTANTIALLY RIGHT ANGLES TO THE INDIVIDUAL FILAMENTS WITHIN A REGION 45 TO 380 MM BELOW THE SPINNERET FACE, THE DIRECTION OF BLOWING THE COLD AIR BEING IN SUBSTANTIAL CORRESPONDENCE WITH THE DIRECTION CONNECTING THE CENTER OF THE MAIN HOLE WITH THAT OF THE STANDARD SUBHOLE.
Claim 3
Dependent Claim
61 words
The method of claim 1, wherein the filaments are drawn after application of the cold air, and mechanically crimped to provide 5 to 15 crimps per inch, and thereafter the filaments are spread in the form of a tow to reduce the apparent density of the tow to less than 0.15 g/cm3, and then the tow is heat-treated under no tension.
References Cited (Backward Citations)
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US3135646A
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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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |