Oriented crystallization of polymers
US3990829A · kind A · utility
4Cited by
5References
8Claims
0Family size
Inventors
Key dates
| Filing date | Jun 19, 1974 |
| Grant date | Nov 9, 1976 |
| Priority date | — |
| Expiry date | Jun 19, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/05
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Molten crystallizable polymer is extruded through an orifice. Opposite the orifice on the upstream side is a fixed surface arranged so as to provide in the molten polymer a line of uniaxial extension or a plane of pure shear passing through the orifice. The polymer is extruded at a temperature and flow rate such as to cause a core of crystalline polymer to form in the melt along said line or plane. It is particularly suitable for extruding a continuous filament having a highly crystalline core in a generally less crystalline matrix of the polymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.