US3733801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Yarn process
Assignee: Celanese Corp
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Filing: 1971-07-01
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Granted: 1973-05-22
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Expires: 1991-07-01
Abstract
Abstract A process for stringing-up an operational simultaneous drawfalse twist machine is disclosed. In the process, the feed roll is engaged first and then the false twister is engaged to insert a low level of false twist in the yarn before the draw roll is engaged by the yarn.
Inventors
- 👤 C Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:23
CPC Classifications
D; D02; D02G; D02G1/00; D02G1/02; D02G1/0206; D02G1/0266; D02G1/0273
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
149 words
A process for stringing-up an operating yarn simultaneous draw texturing machine comprising a heater and a yarn false twister positioned between a yarn feeding means and a yarn drawing means with the heater upstream of the false twister, whereby yarn having a coherency at most equal to a producer twist yarn can be simultaneously false twist crimped and drawn between said feeding means and said drawing means, which comprises the sequential steps of: a. engaging the feeding means with the yarn; b. engaging the false twister with the yarn and running the false twister at a slow speed to false twist the yarn at a low level of twist insertion sufficient to prevent filamentation of the yarn during string-up; c. engaging the drawing means with the yarn while maintaining the yarn close to the heater so that the yarn reaches a temperature at which the yarn draws without breaking;
Claim 2
Dependent Claim
149 words
A process for stringing-up an operating yarn simultaneous draw texturing machine comprising a heater and a yarn false twister positioned between a yarn feeding means and a yarn drawing means with the heater upstream of the false twister, whereby yarn having a coherency at most equal to a producer twist yarn can be simultaneously false twist crimped and drawn between said feeding means and said drawing means, which comprises the sequential steps of: a. engaging the feeding means with the yarn; b. engaging the false twister with the yarn and running the false twister at a slow speed to false twist the yarn at a low level of twist insertion sufficient to prevent filamentation of the yarn during string-up; c. engaging the drawing means with the yarn while maintaining the yarn close to the heater so that the yarn reaches a temperature at which the yarn draws without breaking;
Claim 3
Dependent Claim
41 words
The prOcess of claim 1 wherein the false twister is a hollow spindle false twister, said process including the step of threading the yarn through the spindle while the spindle is stationary prior to engaging the feeding means with the yarn.
Claim 4
Dependent Claim
23 words
The process of claim 2 including the step of wrapping the yarn about a twist trap pin located across the hollow rotatable spindle.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein polyester yarn is being false-twist crimped.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein nylon yarn is being false-twist crimped.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein the heater is a plate heater.
Claim 8
Dependent Claim
19 words
The process of claim 6 including drawing the yarn at a yarn necking point located on the heater plate.
Claim 9
Dependent Claim
18 words
The process of claim 1 including threading the yarn through a second stage heater to a relaxation roll.
Claim 10
Dependent Claim
50 words
The process of claim 1 which comprises operating the false twister in step (b) thereof to insert about 0.2 to 1.0 turns per inch of false twist into the yarn. 10 The process of claim 4 including maintaining the yarn temperature prior to step (e) thereof below about 150* C.
Claim 11
Dependent Claim
47 words
The process of claim 8 wherein said second stage heater is pre-threaded with a yarn threading tool having a yarn engaging end at the upstream side of said heater and then said yarn is engaged by said tool and is pulled through the heater by said tool.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |