Abstract: A method and device for continuously producing slabstock polyurethane foam wherein a polymerizable reaction mixture containing a blowing agent is applied onto a moving conveyor and allowed a free rise expansion and polymerization within a substantially closed space. The pressure in this space is maintained within a predetermined pressure range by continuously supplying gas to the space, in addition to the blowing gas produced by the reaction and by simultaneously exhausting gas from said space. In this way, pressure fluctuations are reduced in the space and further parameters such as the temperature can be controlled so as to enable production of a foam with constant properties.

Abstract: The present invention relates to a device for the continuous manufacture of slabstock polyurethane foam including a conveyor means (1), a mixing head (51) and means (6) for discharging the reaction mixture from the mixing head (51) onto the conveyor means (1). The device further includes a start board (7), a stop board, means for moving the start board (7) along the conveyor means at the beginning of a production run in such a manner that it obstructs the moving reaction mixture to thereby increase the height of the first portion of the produced foam, and means for moving the stop board at the end of a production run in such a manner that it pushes the foaming reaction mixture ahead to thereby increase the height of the end portion. In this way, no operator has to enter the foaming machine and the start and end profiles of the foam blocks are optimised.