Wood-like molded product of synthetic resin

• US 4,610,900 A
• Filed: 12/19/1984
• Issued: 09/09/1986
• Est. Priority Date: 12/19/1984
• Status: Expired due to Fees

• Current Assignee: Nishibori, Sadao
• Original Assignee: Nishibori, Sadao
• Inventors: Nishibori, Sadao
• Primary Examiner(s): Thibodeau, Paul J.
• Application Number:
  US06/683,641
• Time in Patent Office: 629 Days
• Field of Search: 428/151, 428/156, 428/167, 428/326, 428/15, 156/62.2, 156/209, 156/268, 264/162, 264/118, 264/119
• US Class Current: 428/15
• CPC Class Codes: B44C 3/04 Modelling plastic materials, e.g. clay
• CPC Class Codes: B44C 3/08 Stamping or bending
• CPC Class Codes: B44C 5/06 Natural ornaments; Imitations thereof artificial flowers, fruit, leaves A41G1/00; artificial feathers A41G11/00
• CPC Class Codes: Y10T 156/1023 Surface deformation only [e.g., embossing]
• CPC Class Codes: Y10T 156/1082 Partial cutting bonded sandwich [e.g., grooving or incising]
• CPC Class Codes: Y10T 428/24438 Artificial wood or leather grain surface
• CPC Class Codes: Y10T 428/24479 including variation in thickness
• CPC Class Codes: Y10T 428/2457 Parallel ribs and/or grooves
• CPC Class Codes: Y10T 428/253 Cellulosic [e.g., wood, paper, cork, rayon, etc.]

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.

Claims

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 on top 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, the resultant hardened product being free of warping and shrinking.

2. The wood-like molded product of synthetic resin as claimed in claim 1 wherein said surface skin layer is removed by sanding.

3. The wood-like molded product of synthetic resin as claimed in claim 1 wherein said surface skin is removed by jetting.

4. The wood-like molded product of synthetic resin as claimed in claim 1 wherein the surface after the removal of the surface skin layer is embossed with a wood-grain pattern.

5. The wood-like molded product of synthetic resin as claimed in claim 1 wherein the surface after removal of the surface skin layer is provided with grooves to block the internal residual stress.

6. The wood-like molded product of synthetic resin as claimed in claim 1 wherein the surface after the removal of the skin layer forms an adhesion surface to allow other materials to be bonded therewith.