Patent US3874160A successfully refreshed from Google Patents.
US3874160A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing high bulky yarn by false-twisting system
Assignee: Toray Industries Inc
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Filing: 1974-01-14
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Granted: 1975-04-01
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Expires: 1994-01-14
Abstract
Abstract A fibrous strand including at least some short fibers and composed of two or more kinds of fibers of different melting point temperatures is, concurrently with false twisting, and in a vibrating condition, heated by a heater of the non-contact type at temperatures between the highest and lowest melting point temperatures of the component fibers so as to produce spun-like yarns of a substantially twistless configuration containing uniformly scattered points of inter-fiber binding and fibers crimped in the form of a coil.
Inventors
- 👤 Shin-Ich Kitazawa
- 👤 Takao Negishi
- 👤 Kozo Susami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:44
CPC Classifications
D; D02; D02G; D02G1/00; D02G1/02; D02G1/0286; D02G1/0206; D02G1/0253
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
145 words
A PROCESS FOR PRODUCING SPUN-LIKE YARNS BY A FALSETWISTING SYSTEM COMPRISING, IN COMBINATION, FORMING A FIBROUS STRAND FROM AT LEAST TWO KINDS OF FIBERS HAVING DIFFERENT MELTING POINT TEMPERATURES INCLUDING ADDING TO THE FIBROUS STRAND A KIND OF FIBERS HAVING A MELTING POINT TEMPERATURE LOWER THAN A GIVEN TEMPERATURE AND WHICH IS DISSOLVABLE BY A SOLVENT THAT DOES NOT FULLY DISSOLVE THE FIBERS OF THE HIGHEST MELTING POINT TEMPERATURE OF SAID FIBROUS STRAND, SAID FIBROUS STRAND CONTAINING AT LEAST SOME SHORT FIBERS, CONSURRENTLY FALSE-TWISTING, VIBRATING AND HEATING SAID STRAND AT SAID GIVEN TEMPERATURE, SAID GIVEN TEMPERATURE BEING BETWEEN THE HIGHEST AND LOWEST MELTING POINT TEMPERATURE OF SAID FIBERS, CARRYING OUT SAID STEP OF HEATING WITHOUT DIRECT CONTACT BETWEEN SAID FIBROUS STRAND AND ANY HEATING ELEMENT, AND, FOLLOWING SAID FALSE TWISTING, REMOVING AT LEAST SOME OF SAID ADDED KIND OF FIBERS BY TREATMENT WITH SAID SOLVENT.
Claim 2
Dependent Claim
145 words
A PROCESS FOR PRODUCING SPUN-LIKE YARNS BY A FALSETWISTING SYSTEM COMPRISING, IN COMBINATION, FORMING A FIBROUS STRAND FROM AT LEAST TWO KINDS OF FIBERS HAVING DIFFERENT MELTING POINT TEMPERATURES INCLUDING ADDING TO THE FIBROUS STRAND A KIND OF FIBERS HAVING A MELTING POINT TEMPERATURE LOWER THAN A GIVEN TEMPERATURE AND WHICH IS DISSOLVABLE BY A SOLVENT THAT DOES NOT FULLY DISSOLVE THE FIBERS OF THE HIGHEST MELTING POINT TEMPERATURE OF SAID FIBROUS STRAND, SAID FIBROUS STRAND CONTAINING AT LEAST SOME SHORT FIBERS, CONSURRENTLY FALSE-TWISTING, VIBRATING AND HEATING SAID STRAND AT SAID GIVEN TEMPERATURE, SAID GIVEN TEMPERATURE BEING BETWEEN THE HIGHEST AND LOWEST MELTING POINT TEMPERATURE OF SAID FIBERS, CARRYING OUT SAID STEP OF HEATING WITHOUT DIRECT CONTACT BETWEEN SAID FIBROUS STRAND AND ANY HEATING ELEMENT, AND, FOLLOWING SAID FALSE TWISTING, REMOVING AT LEAST SOME OF SAID ADDED KIND OF FIBERS BY TREATMENT WITH SAID SOLVENT.
Claim 3
Dependent Claim
30 words
The process of claim 1 wherein the fibrous strand is fed to a false-twisting zone for effecting said step of false-twisting, comprising underfeeding said fibrous strand to said false-twisting zone.
Claim 4
Dependent Claim
27 words
The process of claim 2 wherein the feed ratio of said fibrous strand to said false twisting zone is in a range of from 0.88 to 1.00.
Claim 5
Dependent Claim
40 words
The process of claim 1 wherein the number of false twists produced in said step of false twisting is in a range from 50N to 150N, wherein N is a metric system count of a yarn produced by said process.
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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |