Abstract: A chipboard structure is disclosed which is made substantially of 100% sawdust waste material. The chipboard has a core portion which contains the coarsest particles of the sawdust, the surface portions of the chipboard containing the finest fraction of the sawdust, intervening portions of the chipboard containing fractions which increase in size from the surface to the core portion of the chipboard. The method and apparatus involve the use of sawdust having a width and/or thickness no greater than 4.75 mm, the fractions of the sawdust having a particle size greater than 0.1 mm being sliced to increase the quantity of the fractions below 0.1 mm. Because the small particles are randomly disposed in the chipboard in directions not only parallel to the plane but also perpendicular and at an angle thereto, characteristics are obtained which are as good as chipboard produced from conventional materials other than sawdust.

Abstract: Method for laying flooring on a solid sub-floor comprising the step of coating the sub-floor with a loose intermediate layer, screeding and thereafter covering the intermediate layer with a pressure distributing layer of semi rigid or rigid plates, whereby the intermediate layer consists of sawdust which has been sifted in order to remove particles having a size exceeding 5 mm and which have improved slender values by having been cut and split substantially along the grain, the sawdust being spread on the sub-floor, screeded to a thickness of 5-25 mm, and covered with the plate material which may be coated with an outer or wearing layer.

Abstract: A chipboard structure is disclosed which is made substantially of 100% sawdust waste material. The chipboard has a core portion which contains the coarsest particles of the sawdust, the surface portions of the chipboard containing the finest fraction of the sawdust, intervening portions of the chipboard containing fractions which increase in size from the surface to the core portion of the chipboard. The method and apparatus involve the use of sawdust having a width and/or thickness no greater than 4.75 mm, the fractions of the sawdust having a particle size greater than 0.1 mm being sliced to increase the quantity of the fractions below 0.1 mm. Because the small particles are randomly disposed in the chipboard in directions not only parallel to the plane but also perpendicular and at an angle thereto, characteristics are obtained which are as good as chipboard produced from conventional materials other than sawdust.