Patent ID: 7220375

Claim:
Method for the manufacture of wood material boards, wherein an endless mat of the material to be pressed is formed from a mixture of wood chips and binding agent, and is introduced between the heated press platens of a multi-platen press, the press platens having, in a second plane, steam directing channels fed at the margin from steam distributing channels having steam openings directed toward the mat, and therein, by means of steam and press platen contact heat, the mat is heated, pressed and cured into wood material boards, comprising the following steps: (a) forming the mat from a wood chip and phenolic resin mixture and introducing the mat into the platen(s) of a single or multi-platen press; (b) after a precompression, introducing a small amount of steam with a low steam temperature through the press platen(s) only into cover layers of the mat; and (c) then compressing the mat to the final thickness of the board and curing the mat.