Patent US4112667A successfully refreshed from Google Patents.
US4112667A
Expired / Lapsed
US
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Apparatus and process suitable for twist-drawing a yarn
Assignee: BP Corp North America Inc
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Filing: 1977-02-22
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Granted: 1978-09-12
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Expires: 1997-02-22
Abstract
Abstract A yarn is twist-drawn on an apparatus employing a 2-for-1 twist spindle; at least one guide roll positioned above the spindle; means suitable for receiving a yarn from said guide roll and drawing the yarn; and means suitable for winding the drawn yarn, wherein the guide roll comprises a cylindrical surface mounted on a shaft which is attached to a base suitable for positioning the cylindrical surface so that the yarn rides on the surface of the roll in a relatively fixed position and a substantial amount of twist is not trapped in the yarn ahead of the guide roll.
Inventors
- 👤 Charles S. Hatcher
- 👤 Kenneth E. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:07
CPC Classifications
D; D02; D02G; D02G3/00; D02G3/22; D02G3/26; D01; D01H; D01H1/00; D01H1/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
105 words
A method comprising: passing an essentially as spun twisted yarn from a twisting zone to a guiding zone; guiding the yarn from the twisting zone to a drawing zone, said guiding zone having at least one guiding member, each member having a cylindrical roller guide having an axis which is adjustable wherein the axis is adjusted so that the yarn rides on the surface of the roll in a relatively fixed position and substantial twist is not trapped in the yarn ahead of the guiding zone; drawing the twisted yarn to produce a twisted and drawn yarn; and winding the thus twisted and drawn yarn.
Claim 2
Independent Claim
105 words
A method comprising: passing an essentially as spun twisted yarn from a twisting zone to a guiding zone; guiding the yarn from the twisting zone to a drawing zone, said guiding zone having at least one guiding member, each member having a cylindrical roller guide having an axis which is adjustable wherein the axis is adjusted so that the yarn rides on the surface of the roll in a relatively fixed position and substantial twist is not trapped in the yarn ahead of the guiding zone; drawing the twisted yarn to produce a twisted and drawn yarn; and winding the thus twisted and drawn yarn.
Claim 3
Dependent Claim
28 words
The method of claim 1 wherein the yarn is drawn in the drawing zone at a ratio ranging from about 2 to 1 to about 6 to 1.
Claim 4
Dependent Claim
22 words
The method of claim 1 wherein the essentially as spun yarn is selected from the group consisting of polyamides, polyesters and polyolefins.
Claim 5
Dependent Claim
11 words
The method of claim 1 wherein the yarn is essentially polypropylene.
Claim 6
Dependent Claim
14 words
The method of claim 1 in which the twisting zone comprises a 2-for-1 twister.
Claim 7
Dependent Claim
29 words
The method of claim 1 wherein the twisted and drawn yarn is produced at a rate within the range of from about 600 to about 1000 meters per minute.
Claim 8
Dependent Claim
24 words
The method of claim 1 wherein the twisted and drawn yarn has a twist ranging from about 0.1 to about 1.0 twists per inch.
Claim 9
Dependent Claim
28 words
The method of claim 1 wherein the twisted and drawn yarn is produced at a rate within the range of from about 800 to 900 meters per minute.
Claim 10
Dependent Claim
23 words
The method of claim 1 wherein the twisted and drawn yarn has a twist ranging from about 0.2 to 0.8 twists per inch.
Claim 11
Dependent Claim
22 words
The method of claim 1 wherein the essentially as spun yarn has a tenacity of less than about 3.0 grams per denier.
Claim 12
Dependent Claim
22 words
The method of claim 1 wherein the essentially as spun yarn has a tenacity of less than about 2.0 grams per denier.
Claim 13
Dependent Claim
24 words
The method of claim 1 wherein the essentially as spun yarn has a tenacity ranging from about 1.0 to about 2.0 grams per denier.
References Cited (Backward Citations)
US3481136A
Cited
US3775961A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-11 | 1982-03-13 | 1982-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-11 | 1986-03-13 | 1986-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-11 | 1990-03-13 | 1990-09-12 | $7700.00 | Window Closed / Lapsed |