PROCESS FOR RECOVERING CHIPS AND FIBERS FROM RESIDUES OF TIMBER-DERIVED MATERIALS, OLD PIECES OF FURNITURE, PRODUCTION RESIDUES, WASTE AND OTHER TIMBER-CONTAINING MATERIALS

摘要

A process is disclosed for recovering chips and fibres from residues of timber-derived materials, old pieces of furniture, production residues, waste and other timber-containing materials glued with urea-formaldehyde binders or other binders capable of being hydrolysed or chemically disintegrated by disintegrating the timber-derived materials at a high temperature. In a first step of the process, the residues of timber-derived materials are impregnated with an impregnating solution and previously swollen until they have absorbed at least 50 % of their own weight of impregnating solution. In a second step, the thus impregnated residues of timber-derived materials are heated up to 80 .degree.C to 120.degree.C. The thus disintegrated residues of timber-derived materials are then sorted by sieving and/or wind screen ing. The residues of timber-derived material have edges of at least 10 to 20 cm length. In an improvement of the invention, the residues of timber-der ived materials are impregnated and heated at the same time.