Method of manufacturing a sandwich panel

摘要

A process for producing a multi-layered laminar board (1) which consists of a hard foam layer (2) sandwiched between two cover layers (3a,3b), comprises continuously unwinding two cover layers from a roll, and feeding them to a twin band unit (31). A foamable mixture (21) is supplied to the space between the bands, and foamed to form a hard foam layer. An adhesive (4) is applied to one of the covering layers using a coating unit (24). The adhesive is rolled or painted on, and consists of a heat activated thermoplastic. The hard foam is polyurethane and the cover layers are paper or card.