Abstract: A method for producing construction panels comprising cellulose fibers as the reinforcing means and of at least one inorganic binder such as cement and possibly of fillers, wherein the crude panels are subjected to air hardening by being stored in stacking structures so that in spite of the use of cement as the binder, cellulose fibers are used without being destroyed.The invention provides that the sulfur trioxide content in the cement shall be less than 2%.

Abstract: In a process for depositing a coat of paint on wood-cement boards manufactured by pouring a strewable mixture of fibers and binder onto press plates and then stack-pressing, with a coat of paint being applied to the board surface after pressing, the board shall be provided with a coat of paint of extremely long life approximately corresponding to the life of the board. This problem is solved by the invention in that a binder liquid colored-through with an inorganic dye is deposited on the layer of the strewable layer poured on the press plate and that the press plate together with the layers so deposited is fed to the press.

Abstract: A process is created for incorporating surface structures into wood-cement boards which are pressed during cement hardening in a batch press and then are kept in clamping apparatus in the pressed state for a substantial length of time.In the invention the wood-cement boards freed from their plates and after their storage in the clamping apparatus are fed to a calendering system of which the calendering rolls are provided with a surface structure, the wood-cement boards moving between the calender rolls and being provided by these with surface structures on one or on both sides.

Abstract: An improvement in the method and apparatus for fabricating asbestos-cement boards, wherein a felt band coated with fiber fleece is fed to a pair of press rollers in nip relationship and wherein the coating of the felt band with fiber fleece is effected by wet deposition on the felt band and by suction from the side opposite same.The fiber fleece obtained by wet deposition on the felt band following the deposition is condensed and dehydrated by a system consisting of a sieve cylinder and of an associated suction roller operating in nip relationship.