Process for producing textured polyester multifilament yarn
US4044541A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 10, 1975 |
| Grant date | Aug 30, 1977 |
| Priority date | — |
| Expiry date | Apr 10, 1995 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD02G1/026
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Textured polyester multifilament yarn having uniform quality in dye-absorbing properties and crimp properties is produced by a combined draw-texturing method wherein a feed yarn composed of a plurality of polyester filaments having a birefringence of at most 0.04 is drawn and simultaneously or sequentially textured, said feed yarn being produced by meltspinning a synthetic linear ethylene terephthalate polymer to form an undrawn multi-filament yarn, winding up the undrawn yarn and, before and/or after the winding operation, applying to the undrawn yarn a finishing agent which is not capable of diffusing into the inside of the filaments but is capable of preventing protuberance formation at a surface protuberance number larger than 5 on the surface of the filaments when the feed yarn is aged at a temperature of 40.degree. C at a relative humidity of 70% for 21 days and, then, twisted at a twist number of 32500/.sqroot.D turns/m, wherein D represents a denier of the feed yarn, without drawing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.