Distributor for thermoplastic extrusion die
US4043739A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 21, 1975 |
| Grant date | Aug 23, 1977 |
| Priority date | — |
| Expiry date | Apr 21, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/09
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An extrusion die for thermoplastic polymer is disclosed having a distributor which provides substantially constant residence time and pressure loss of polymer flowing through the die from the inlet to the extrusion aperture. Dies are disclosed for extrusion of sheet, film and discontinuous microfibers. The distributor has cross flow channels for conveying the polymer laterally and axially connected pressure loss and residence time control sections for independently compensating for the varying pressure loss and residence time characteristics of the polymer flow through the distribution channels. With a distributor so constructed, the overall height of the die remains substantially the same as the die width increases so that the distributor is particularly suitable for dies for wide extrusion lines.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.