FIREPROOF MINERAL WOOL PRODUCT AND PROCESS FOR ITS PREPARING

摘要

This invention relates to a fireproof product and to a process for manufacturing fireproof mineral wool products, e.g. mineral wool slabs. In the present process mineral raw material is melted and fibrated into mineral wool fibres (13) which thereafter simultaneously are collected into two or more separate primary mineral fibre webs (4a, 4b), each onto separate own collection drums (11, 12), whereafter these separate primary mineral fibre webs (4a, 4b) at a later stage are joined into an intermediate mineral fibre web (38), which through a folding process is formed into a final mineral fibre web having a desired thickness. In the process there is, before the separate primary mineral fibre webs (4a, 4b) are joined in order to form an intermediate mineral fibre web (38), added fire retardant to the surface of and/or into at least one of the primary mineral fibre webs (4a or 4b) in the space between the intermediate mineral fibre webs (4a, 4b) over at least one longitudinal region (40, 41) having a width at least partially extending over the width of the primary mineral fibre web (4a or 4b) in question from at least one of the lateral edges (44 or 45) of the primary mineral fibre web in question.