Process for using an extruder die assembly for the production of fiber reinforced thermoplastic pellets, tapes and similar products
US5268050A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 5, 1991 |
| Grant date | Dec 7, 1993 |
| Priority date | — |
| Expiry date | Jun 5, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2101/12
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The invention provides an extruder die assembly for use in the production of fiber reinforced thermoplastic product which overcomes the problem of poor wetting of the fiber filaments. The die assembly also facilitates the production of fiber-reinforced products having high fiber concentration in the end product. The die assembly includes a cone-shape passage defined by decreasing radius from the inlet to the outlet. A plurality of pins are disposed within the passage. A thermoplastic melt is fed through the die assembly in the opposite direction to that of the fiber feed. As the fiber feed travels through the passage the pins spread the fibers helping to ensure that the molten thermoplastic thoroughly wets the fiber filaments.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.