Appts. for continuous mfr. of slab stock polyurethane foam - uses conveyor with start=stop boards which are moved into contact with foam at beginning and end of prodn. run to maintain required profile

摘要

Appts. comprises: (a) a mixing head for mixing polyurethane reaction components contg. a blowing agent; (b) means for discharging the mixt. onto a conveyor; (c) means for positioning a start board transversely on the conveyor near the discharge point at the beginning of a prodn. run; (d) means for operating the start board in such a way as to obstruct the reaction mixt. and increase the height of the front position thereof, and subsequently move it at the same speed as the conveyor; (e) means for removing the start board from the conveyor after the front portion of the foam is sufficiently shape-retaining, (f) means for positioning a stop board transversely on the conveyor after the mixt. discharge has stopped; and (g) means for moving the stop board so as to push the mixt. ahead w.r.t. the conveyor and increase the height of the end portion of the slabstock foam.