Patent ID: 6136239
Filing Date: 2000-10-24
Classification: B27N

Abstract:
A continuous method for manufacturing a finished board product from lignocellulose containing material comprising disintegrating said lignocellulose containing material, drying said disintegrated lignocellulose containing material, gluing said dried lignocellulose containing material, forming said glued lignocellulose containing material into a mat, pressing said mat into the form of said board, said pressing of said mat comprising initially pressing said mat in the presence of steam in a heating medium in order to produce a partially pressed, partially hardened, board having a center and first and second surface layers with a substantially uniform density and subsequently pressing said first and second surface layers of said partially pressed board in order to increase the density of said first and second surface layers as compared to the density of said center of said board thereby producing a compressed board with a non-uniform density profile and further hardening said compressed board in order to produce said finished board product.