United States Patent
US Patent 4610900: Wood-like molded product of synthetic resin
US 4610900 · granted 1986-09-09
Abstract
The present invention relates to wood-like molded products of synthetic resin which are manufactured by mixing a synthetic resin material with a fine aggregate of cellulose base such as wood meal, chaffs, begasse and in which the internal residual stress which may cause deformation (for example, warping and twisting) of the products at the time or after molding is eliminated in advance to prevent chronological deformation. More particularly, it relates to a method of eliminating said residual stress by subjecting the molded products containing cellulose-base aggregate, especially the resinous skin layer thereof, to re-heating, curing and sanding or jetting treatments (sand blasting, shot peening, grit blasting) under predetermined conditions.
| Patent Number | 4610900 |
|---|---|
| Title | Wood-like molded product of synthetic resin |
| Filed | 1984-12-19 |
| Granted | 1986-09-09 |
| Inventor(s) | Nishibori; Sadao |
| Number of Claims | 9 |
Abstract
The present invention relates to wood-like molded products of synthetic resin which are manufactured by mixing a synthetic resin material with a fine aggregate of cellulose base such as wood meal, chaffs, begasse and in which the internal residual stress which may cause deformation (for example, warping and twisting) of the products at the time or after molding is eliminated in advance to prevent chronological deformation. More particularly, it relates to a method of eliminating said residual stress by subjecting the molded products containing cellulose-base aggregate, especially the resinous skin layer thereof, to re-heating, curing and sanding or jetting treatments (sand blasting, shot peening, grit blasting) under predetermined conditions.
Claim 1
A wood-like molded product of synthetic resin comprising a molded cross-linked thermoplastic resin product of fine cellulose-base aggregate having only the skin layers ontop and bottom surfaces of the molded product removed after molding, by first contracting said molded product in longitudinal direction under heat treatment so as to exude the concentrated resin on the skin layers prior to removing the skin layers, theresultant hardened product being free of warping and shrinking.
Claims
9 totalA wood-like molded product of synthetic resin comprising a molded cross-linked thermoplastic resin product of fine cellulose-base aggregate having only the skin layers ontop and bottom surfaces of the molded product removed after molding, by first contracting said molded product in longitudinal direction under heat treatment so as to exude the concentrated resin on the skin layers prior to removing the skin layers, theresultant hardened product being free of warping and shrinking.