Method for producing lower size, high tenacity and high modulus polyethylene fiber
US8858851B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 11, 2008 |
| Grant date | Oct 14, 2014 |
| Priority date | — |
| Expiry date | Sep 3, 2030 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD02J1/228
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The present invention discloses a process for producing low-titer, high-strength and high-modulus polyethylene fibers, comprising the following steps: dissolving the ultra-high molecular weight polyethylene into paraffin oil with a low viscosity to form a spinning solution with a concentration of 3˜15%; extruding the spinning solution through a thin spinneret with at least 10 orifices having a diameter φ of 0.7˜0.8 mm and a length/diameter ratio of 10˜12, by applying a high pressure in the range of 2.5±1.0 MPa to the spinning solution, such that the fluid in the orifices is extruded at a shear rate of 200˜3 500 sec−1; and then performing a jet stretch at a deformation rate of 200˜5 000 min−1 within an air-gap of 10˜15 mm between the spinneret and the quench bath surface; feeding the jet-stretched fluid into the quench bath to form gel filaments; extracting and drying the gel filaments; and performing a multistage ultrahigh post stretch on the dried gel filaments with a stretch ratio of 15 or less. In this process, the solution is extruded at a high rate by using a spinneret with small orifice diameter, thereby achieving a high shear rate and a high deformation rate, so the present …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.