Making pressed board

摘要

A fiber or chip board is made by first forming a mixture of a binder and particles having a relatively low moisture content that is substantially less than a relatively high moisture content that a finished board should have. This mixture is deposited as a mat on a movable substrate so that the mat is substantially at ambient temperature and has the relatively low moisture content. Then the mat is preheated with steam to raise its temperature and to increase its moisture content to the predetermined relatively high moisture content. The thus preheated mat, whose moisture content has been corrected, is then simultaneously heated and compressed to form it into a board.