Patent US3761556A successfully refreshed from Google Patents.
US3761556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
The manufacture of bulked yarn
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1971-08-23
•
Granted: 1973-09-25
•
Expires: 1991-08-23
Abstract
Abstract A process for producing a bulked nylon 6.6 filament yarn by the steps of continuously spinning, drawing and crimping in which the filaments, after melt spinning are subjected to a two-stage steaming process, the second stage of which is for a period of at least 5 seconds maintaining the yarn temperature at at least 55* C and raising the moisture content of the yarn to at least 9 percent. Crimping is performed by a steam injection stuffer-box crimping treatment as described in British Pat. No. 1,034,418. Desirably the yarn is intermingled after crimping and wound up without the insertion of twist.
Inventors
- 👤 D Thom
- 👤 N Hayman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:00
CPC Classifications
D; D02; D02J; D02J1/00; D02J1/22; D02J1/221; D02G; D02G1/00; D02G1/12; D02G1/127
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
23 words
A process according to claim 1 wherein the yarn after the crimping treatment is intermingled and subsequently wound up without application of twist.
Claim 2
Dependent Claim
12 words
A process according to claim 1 wherein the polyamide is polyhexamethylene adipamide.
Claim 3
Dependent Claim
16 words
a process according to claim 3 wherein the first steam treatment comprises a steam conditioning process.
Claim 4
Dependent Claim
48 words
A process according to claim 4 wherein the second steaming treatment is continued for a time such that the yarn temperature is maintained at at least 55* C and the moisture content of the yarn is raised to at least 9 percent prior to leaving the steaming stage.
Claim 5
Dependent Claim
16 words
A process according to claim 5 wherein steam is saturated or superheated to about 105* C.
Claim 6
Dependent Claim
23 words
A process according to claim 5 wherein the yarn tension at the start of the second steam treatment is at least 0.05 g/dtex.
Claim 7
Dependent Claim
22 words
A process according to claim 3 wherein a spin finish is applied to the yarn between the first and second steam treatments.
Claim 8
Dependent Claim
157 words
A process for the manufacture of a crimped polyamide yarn in which the spinning, drawing and crimping operations are performed simultaneously, said process comprising: melt-extruding a polyamide into a plurality of undrawn filaments; cooling the filaments; steaming the filaments by exposing them to steam for a period of time up to about 0.2 secondS to raise the moisture content of the filaments to about 1 percent; applying a spin finish to the filaments; passing the filaments at a moisture content of about 5 percent -8 percent to a second steaming treatment of longer duration than the first steaming, said second steaming treatment being carried out for at least 5 seconds to raise the moisture content of the filaments to at least 9 percent and to maintain the filaments at at least 55* C.; drawing the filaments; crimping the filaments by the action of high pressure steam in a steam injection stuffer box; and winding up the filaments.
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |