Patent US3673650A successfully refreshed from Google Patents.
US3673650A
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Method for producing a thermoplastic synthetic yarn having a latent crimp
Assignee: Bemberg SpA
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Filing: 1970-04-29
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Granted: 1972-07-04
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Expires: 1990-04-29
Abstract
Abstract A drawing method and device for thermoplastic synthetic yarn is disclosed, by which simultaneously a latent crimp is imparted to the yarn, wherein the yarn is drawn by means of a heated drawing roll, the contact between the yarn and the heated surface of the roll is not continuous. The invention contemplates also the yarn thus obtained and the textile articles made by the yarns as above referred.
Inventors
- 👤 Giacomo Cerutti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:37
CPC Classifications
D; D02; D02J; D02J1/00; D02J1/22; D02J1/225; D02J1/226; D02G; D02G1/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
126 words
A method of drawing a thermoplastic yarn of the class including polyamide and polyester yarns and simultaneously imparting thereto a latent crimp, said method comprising the steps of positively feeding the yarn at a first rate at a first point and positively feeding the yarn at a spaced second point at a second and greater rate to draw the yarn between said first and second points, and at said second point simultaneously with the drawing of the yarn heating short lengths of the yarn at spaced intervals utilizing solely a heated toothed draw roll about which the yarn passes at least substantially one complete turn to provide firm anchorage of said yarn relative to said draw roll for effecting the drawing and heating of said yarn.
Claim 2
Independent Claim
126 words
A method of drawing a thermoplastic yarn of the class including polyamide and polyester yarns and simultaneously imparting thereto a latent crimp, said method comprising the steps of positively feeding the yarn at a first rate at a first point and positively feeding the yarn at a spaced second point at a second and greater rate to draw the yarn between said first and second points, and at said second point simultaneously with the drawing of the yarn heating short lengths of the yarn at spaced intervals utilizing solely a heated toothed draw roll about which the yarn passes at least substantially one complete turn to provide firm anchorage of said yarn relative to said draw roll for effecting the drawing and heating of said yarn.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein the surfaces of said Draw roll are heated to a temperature ranging between 100* C. and 200* C.
Claim 4
Dependent Claim
37 words
The method of claim 1 wherein the length of each heating of said yarn is between 1 mm and 15 mm and the spacing between adjacent heatings of said yarn being between 1 mm and 15 mm.
Claim 5
Dependent Claim
18 words
The method of claim 1 wherein the yarn is passed around the draw roll at least several times.
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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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |