Process for the manufacture of short fibrils and devices for carrying it out
US4081226A · kind A · utility
5Cited by
5References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 17, 1976 |
| Grant date | Mar 28, 1978 |
| Priority date | — |
| Expiry date | Nov 17, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/049
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A process is provided for the manufacture of fibrils of short length by suddenly releasing the pressure acting on a two-phase liquid mixture of molten polymer and solvent and which is at a high pressure and a high temperature. The two-phase liquid mixture is ejected through a pressure release orifice so as to vaporize the solvent instantaneously and solidify the polymer, and the flow path of the two-phase liquid mixture is perturbed at the instant when it enters the pressure release orifice. Spinnerets are provided which have a perturbation chamber containing a supply orifice and a pressure release orifice.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.