US3601872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of crimped yarns
Assignee: Akzona Inc
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Filing: 1968-12-11
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Granted: 1971-08-31
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Expires: 1988-12-11
Abstract
Abstract A method for the manufacture of a crimped synthetic yarn which comprises introducing two crimps, separately, into a yarn, a latent crimp being introduced into the yarn by heating the yarn asymmetrically while under tension, and a direct crimp being introduced into the yarn by subjecting the yarn to a direct crimping treatment. Also an apparatus for carrying out this method and the yarn obtained by the method are disclosed.
Inventors
- 👤 Hendrik Potman
- 👤 Jannes Eshuis
- 👤 Hendrinus Sempel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:14
CPC Classifications
D; D02; D02G; D02G1/00; D02G1/12; D02G1/127
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
20 words
The method of claim 1 in which the latent crimp is introduced into the yarn prior to the direct crimp.
Claim 2
Dependent Claim
20 words
The method of claim 1 in which the direct crimp is introduced into the yarn prior to the latent crimp.
Claim 3
Dependent Claim
27 words
The method of claim 1 in which the direct crimp is introduced into the yarn by a gear crimping, a box crimping, or an air crimping treatment.
Claim 4
Dependent Claim
51 words
The method of claim 4 in which the direct crimp is introduced into the yarn by gear-crimping the yarn, and the gear-crimping is carried out in a drawing zone between a feed roll and a draw roll, said draw roll being driven at a higher circumferential speed than the feed roll.
Claim 5
Dependent Claim
27 words
The method of claim 1, in which prior to being bent, the yarn is heated at a temperature in the range of from 70* to 180* C.
Claim 6
Dependent Claim
30 words
The method of claim 1 in which the introduction of the direct crimp and the introduction of the latent crimp by asymmetrical heating are carried out in a continuous operation.
Claim 7
Dependent Claim
18 words
The method of claim 7, in which the yarn is subjected to the two crimping treatments and drawn.
Claim 8
Dependent Claim
28 words
The method in a continuous-type operation of claim 8 in which the drawing operation and the two crimping treatments are carried out immediately after melt-spinning of the yarn.
Claim 9
Dependent Claim
21 words
The method of claim 1 in which the asymmetrical heating of the tensioned yarn takes place after drawing of said yarn.
Claim 10
Dependent Claim
21 words
The method of claim 1 in which the yarn is a multifilament yarn having a denier which is higher than 500.
Claim 11
Independent Claim
137 words
An apparatus for manufacturing crimped synthetic yarn having two separate and distinct crimps comprising a yarn supply, a yarn tensioning means, means for supplying the yarn from said yarn supply via said tensioning means to two crimping means, one of said crimping means comprising heating means adjacent and in contact with a portion of the cross section of the tensioned yarn for a relatively short period of time to heat that portion of yarn asymmetrically to a temperature higher than the softening point of the yarn and thereby form a latent crimp therein, and the other crimping means comprising a separate means for heating the yarn to a temperature lower than the softening point of the yarn and means adjacent to said separate heating means for bending the yarn to introduce a direct crimp into said yarn.
Claim 12
Dependent Claim
21 words
The apparatus of claim 12 in which said other crimping means, comprises means for gear-crimping, box-crimping, or air-crimping of the yarn.
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) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |