Abstract: An arrangement for processing ligno-cellulose containing particles for the manufacture of wood-product plates. These have layers of oriented chips, and a chipper comminutes raw material. The fine material and dust are separated by a sifting device, and the sifted chips are provided with binder material by a gluing device. The chipper produces more chips of as great a length as possible than are required for forming of at least one cover layer of a mat. Behind the chipper, there are provided a wet-chip bunker and a dryer. The sifter separates the chips, obtained after removal of the fine material and the dust, into two fractions. The chip composition of one of these fractions, during the processing time, constantly contains chips which are as long as possible and which are more than that required for forming the mat layer. The other fraction has shorter chips obtained during chipping, and both fractions are present each in at least one bunker.

Abstract: A process for the production of chipboards, fiberboards, and the like boards, from particles containing lignocellulose and/or cellulose and/or other particles which are electrically non-conductive and have a poor thermal conductivity, combined with at least one binder and water. The process includes the steps of combining the particles, binder and water, forming a layer on a moving support, preheating the layer by high frequency and thereafter pressing the layer into boards with the use of contact heat that produces a steam blast that is effective from the outside of the layer toward its inside and is characterized in that the layer is initially provided with the same amount of moisture throughout, which is sufficient to produce, by means of the high frequency preheating step, a steam blast which proceeds from the inside of the layer into the surface zone thereof.

Abstract: Process and apparatus for the continuous production of chipboards, fibreboards, or the like from lignocellulose containing particles mixed with binders, which particles are strewed onto an endless conveyor belt forming a mat or fleece, which mat is subsequently introduced into a press and compressed therein to a panel sheet under the effect of heat during which period the binder hardens, characterized by heating apparatus for heating the upper cover layer of the mat before the mat enters the feeding zone of the press. Preferred apparatus for heating the upper cover layer of the mat includes indirect radiant heat supplying devices such as infra-red lamps. The preferred temperature range to which the upper mat cover layer is heated is 30.degree. to 50.degree. C.