High-strength spun yarn produced from continuous high-modulus filaments, and process for making same
US7188462B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 6, 2004 |
| Grant date | Mar 13, 2007 |
| Priority date | — |
| Expiry date | Nov 4, 2024 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01G1/08
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A process for making a high-strength spun yarn begins by feeding one or more tows of substantially uncrimped continuous filaments of high-modulus material having a tensile modulus exceeding about 20×106 psi through a high-speed stretch-breaking apparatus operating at low total draft ratio (preferably about 2.0) to break the filaments into high-modulus staple fibers having an average length in the range of about 5 to 6 inches. The tows advantageously are heavy, for example, having a denier of about 25,000 to about 500,000. Following the stretch-breaking step, the staple fibers are collected in sliver cans, and the staple fibers are advanced from the sliver cans to a spinning machine, where the fibers are spun into yarn. An important aspect of the invention is that no intermediate processes are performed between the stretch-breaking and spinning processes, which minimizes disruption of the alignment of and damage to the staple fibers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.