Hardboard with smooth, dense surface and method

Details Hardboard with smooth, dense surface and method Hardboard with smooth, dense surface and method

1979-02-01

1980-12-09

Silverman, Stanley S.

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

With reshaping or surface embossing of formed article

156 622, 162136, 162223, 162225, 264128, D21J 108

Patent

active

042384389

ABSTRACT:
Disclosed is a hardboard with a smooth, highly-consolidated, dense surface and a method for making it. The method of this invention greatly reduces the need for surface sanding after molding because release from the molding caul is improved and results in a product having a surface more free of defects. According to a preferred embodiment, a dry mat of wood particles is sprayed with from 8 to 30 grams per square foot of a surface coating of a consolidating agent comprising from 50 to 95% water, from 4 to 25% ethylene glycol and from 1 to 25% polyvinyl acetate, prior to pressing at elevated temperature. These percentages are based on the weight of the consolidating agent. The preferred products will have at least one highly-consolidated, smooth surface layer which comprises from 0.5 to 4 grams of polyhydric alcohol and from 0.5 to 4 grams of polyvinyl acetate per square foot of surface.

REFERENCES:
patent: 2872337 (1959-02-01), Heritage et al.
patent: 3151016 (1964-09-01), Kutik
patent: 4053339 (1977-10-01), Story et al.

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