Method of making composition board

B - Operations – Transporting – 29 – D

Patent

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Details

18/1004, 18/1015

B29D 3/02 (1980.01)

Patent

CA 1044421

METHOD OF MAKING COMPOSITION BOARD ABSTRACT OF THE DISCLOSURE A composition board consisting essentially of a resin binder in the amount of between about 10% and 45 by weight and filler materials in the amount of between about 90% and 55% by weight and having a cross section of varying depth formed as a result of differentially compacting a dry blank to a thickness which is between about 30% and 70% of the original thickness at an average pressure of between about 600 psi and 1500 psi at an elevated temperature which is between about 275° F. and 350° F. so as to cause portions which were compacted to a greater degree to exhibit a darker color than portions which were compacted to a lesser degree to thereby produce a tonal effect on said composition board.

217751

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