Woody resin molding, polished woody resin, and processes for producing the same
US8518529B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 13, 2007 |
| Grant date | Aug 27, 2013 |
| Priority date | — |
| Expiry date | Oct 10, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/269
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present invention provides a method for manufacturing a woody resin molded body which comprises a step of passing a woody resin composition containing a thermoplastic resin, a cellulose powder and a blowing agent, a weight ratio of the thermoplastic resin to the cellulose powder being from 20/80 to 80/20, through a shaping die that has no core body and extruding the woody resin composition into a cooling die. A barrel temperature of an extrusion molding machine is set lower than a foaming temperature of the blowing agent, and a temperature of the shaping die is set within a foaming temperature range of the blowing agent, to thereby obtain a woody resin molded body which has a high-expanded foam layer and a low-expanded foam layer formed on the outside of the high-expanded foam layer and in which the cellulose powder is not exposed on a surface of the low-expanded foam layer. In accordance with the present invention, a woody resin molded body is provided that is lightweight and similar to natural wood in secondary processability such as nail driving and screw tightening. The woody resin molded body is free from appearance defects such as streak patterns caused by the presence of…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.