Method for the production of an expanded fiber-reinforced thermoplastic resin molding
US6419862B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 26, 2001 |
| Grant date | Jul 16, 2002 |
| Priority date | — |
| Expiry date | Jun 26, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C44/10
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present invention provides a method for producing an expanded fiber-reinforced thermoplastic resin molding, the method using a mold comprising a female and male dies and comprising processes for supplying a molten thermoplastic resin containing reinforcing fibers whose average fiber length is maintained at 1 mm or more to between the female and male dies to charge a mold cavity with the molten thermoplastic resin, opening a part or the whole of the mold in the thickness direction of a molding after the charging, and cooling a molding while maintaining a cavity clearance at the thickness of a final molding, the method wherein the mold cavity of the mold is interconnectable to the atmosphere, the method further comprising steps for (a) forming a solidified layer in the surface of the molten thermoplastic resin charged in the mold cavity, followed by (b) breaking at least a part of the solidified surface layer, introducing the air through the broken part concurrently with or after the breakage, and opening a part or the whole of the mold concurrently with the introduction of the air so that a cavity clearance defined there reaches the thickness of the final molding.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.