Extrusion die
US4008035A · kind A · utility
8Cited by
6References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 7, 1975 |
| Grant date | Feb 15, 1977 |
| Priority date | — |
| Expiry date | Jul 7, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/12
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An extrusion die is made by stretching a flexible membrane having one end held in a shape conforming to the input end of the die and the other end maintained in conformity with the desired profile of the part to be extruded. A fluid having hardening properties is applied to one surface of the distended membrane. Once the material has hardened, the flexible diaphragm is stripped away, and the resultant contour is coated with a material to form the contour of the die. This contour is cast in a shell, with appropriate heat and heat sensing elements, to form the die.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.