Method for making helically wound extrudate particles
US4960554A · kind A · utility
7Cited by
12References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 21, 1987 |
| Grant date | Oct 2, 1990 |
| Priority date | — |
| Expiry date | May 21, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/12
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An extrusion die useful for forming helical extrudate particles of inorganic oxide materials, is made by molding the die around pins having helical outer surface to form extrusion holes in the die. Helical walls of the extrusion holes are formed by the helical shape of the pins. When the molded die is formed, the helical pins are unscrewed out of the helical holes in the die to avoid damage to the die.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.