Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1996-01-11
1996-11-26
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521917, C08G 1800
Patent
active
055786553
ABSTRACT:
An apparatus and a process for the production of frothed polyurethane foams: the reactive polyurethane components are mixed with a liquid low-boiling blowing agent and a nucleation gas by a mechanical mixer under pressure controlled conditions in a mixing chamber to keep the blowing agent in the liquid state and cause a fine dispersion of the nucleation gas. The reactive polyurethane components, the blowing agent and the nucleation gas are mixed by reverse flowing the mixture in respect to centrifugal forces generated by a rotor member in the mixing chamber, and by subjecting the same mixture to repeated stirring and whirling actions while it is flowing towards a central discharge outlet and circulating in a radially extending annular path, between facing surfaces of the rotor member and a bottom wall of a mixing chamber provided with intermeshing sets of axially extending pegs.
REFERENCES:
patent: 5223552 (1993-06-01), Reinink
patent: 5443797 (1995-08-01), Proksa et al.
patent: 5472990 (1995-12-01), Craig et al.
Foaming Technologies Cardio B.V.
Foelak Morton
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