Method of improving melt spinning of linear ethylene polymers
US5254299A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 27, 1991 |
| Grant date | Oct 19, 1993 |
| Priority date | — |
| Expiry date | Aug 27, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2205/02
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An improved method of melt spinning linear polyethylene into fiber, especially fine denier fiber, with minimal fiber breakage is disclosed. The method includes imparting high shear into the polyethylene just prior to extrusion through the spinneret die and also results in lower die swell. The high shear can be imparted by use of sintered metal filter media, multiple stacks of fine mesh screens or similar shear inducing media. The method is especially effective when the linear polyethylene contains a relatively high molecular weight species, as determined using gel permeation chromatography with a low angle laser light scattering detector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.