Process and apparatus for the production of a low-shrinkage aliphatic polyamide yarn, and low-shrinkage yarn
US10689778B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 5, 2015 |
| Grant date | Jun 23, 2020 |
| Priority date | — |
| Expiry date | Jun 28, 2036 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD02J1/229
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A process and an apparatus for production of a low-shrinkage aliphatic polyamide fibre, in which polyamide is extruded through a spinneret to form filaments, then cooled and combined to form at least one yarn. The at least one yarn is subjected to drawing between the spinneret and a pair of inlet rolls, then in a further multi-stage drawing step is subjected to 4-fold to 6-fold drawing by pairs of draw rolls. The pairs of draw rolls successively heat the yarn and at least the last pair of draw rolls has a temperature of 5° C. to 20° C. below the melting point of the yarn. The yarn is relaxed by from 6% to 10% in a subsequent at least three-stage relaxation zone and is kept in a temperature range of 5° C. to 15° C. below the melting point of the yarn, and is subsequently wound up on a reel device. The invention further relates to a yarn composed of a low-shrinkage aliphatic polyamide fibre.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.