Patent ID: 6533890
Filing Date: 2003-03-18
Classification: B27N

Abstract:
A method for the production of a ligneous material board from a mat formed of a material treated with a thermosetting binding agent in a steam press, the method comprising the steps:introducing the mat into a press chamber formed by a first press platen and a movable press platen; closing the press chamber; sealing the mat in a main press area by applying pressure at an outer margin of the mat; introducing steam into the press chamber through openings in at least one of the two press platens; compressing the mat using compression pressure; curing the mat to yield a finished board; opening the steam press; and removing the finished board from the press chamber, wherein the pressure applied at the outer margin of the mat is applied independently of the compression pressure, wherein the compression pressure applied to the mat is applied in the main press area by a first hydraulic circuit and in a frame area by a second hydraulic circuit, and wherein the first and second hydraulic circuits are operated by respective hydraulic control circuits during the step of compressing the mat using compression pressure.