A PROCESS FOR THE PREPARATION OF A LAYERED INSULATING BOARD, AND A LAYERED BOARD AND A USE OF THIS BOARD

摘要

The present invention relates to a process for the preparation of a mineral fibre insulating board, which insulating board comprises at least one high density layer and at least one low density layer. The process comprises provision of a primary web comprising a binding agent, and compression of the primary web in one or more longitudinally extending zones comprising an added compression aid, doubling of the primary web under formation of a secondary web, and curing and optional compression of the secondary web.