Use of an open porous thermoplastic netting as the laminating adhesive in forming a mineral wool fiberboard product

Claim 1

In a method of manufacturing a dry laid mineral wool fiberboard product faced with an open mesh glass fabric wherein fibers and resin binder forming the board product are entrained in an air stream and deposited on two converging forming wires and wherein an open mesh glass fabric is positioned between the lower forming wire and the layer of fibers and resin binder being formed thereover, with the fabric acting as a carrier which becomes adhered to the mineral wool fiberboard after consolidation of the two layers of fibers and resin binder and during oven cure of the resin binder, the improvement comprising: feeding an open weave thermoplastic netting between the open mesh glass fabric and the fibers and resin binder being formed thereover, said thermoplastic netting being of an open porous structure such that air flow through the fabric and netting during the forming operation is not impeded, said netting having a melting point below the oven curing temperature required for curing the resin binder in the mineral fiberboard whereby during the oven cure the netting melts and forms, on cooling, an adhesive bond between the glass fabric facing and the fiberboard.