Process and apparatus for the preparation of a polyurethane...

Details Process and apparatus for the preparation of a polyurethane... Process and apparatus for the preparation of a polyurethane...

B - Operations, Transporting

29

B

B29B 7/74 (2006.01)

Patent

CA 2107240

The variations in the delivery rate of additive caused by fluctuations in a system for the preparation of a polyurethane reaction mixture from flowable reactants and an additive, in particular a blowing agent, are kept within negligible limits by subdividing the supply pipe (4) to the mixing head (6) into a main pipe (8) and a subpipe (9) and introducing the additive into the side stream, which is substantially smaller than the main stream.

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