Patent ID: 7278842

Claim:
An apparatus for the continuous production of polyurethane sandwich elements comprising an upper outer layer, a lower outer layer, and a layer of cellular polyurethane lying in between the outer layers and which is firmly bonded to the outer layers, and which comprises a circulating upper belt for guiding the upper outer layer, a circulating lower belt for guiding the lower outer layer, a feed device for feeding the upper outer layer onto the circulating upper belt, a feed device for feeding the lower outer layer onto the circulating lower belt, a first mixing head arranged above the lower outer layer to apply the polyurethane reaction mixture to the lower outer layer, a second mixing head arranged below the upper outer layer to apply the polyurethane reaction mixture to the upper outer layer, a metering device to meter the reaction components to the first mixing head, to the second mixing head, and to the lines between the metering device and the first and the second mixing heads, with the second mixing head being a spray mixing head wherein the spray zone in which the scattered mists caused by the spraying polyurethane foam forming reaction mixture are demarcated from the environment by films or paper webs, wherein said films or paper webs are moved in a direction perpendicular to the direction of the movement of the upper layer.