Patent ID: 6019919
Filing Date: 2000-02-01
Classification: B29B,B29C,Y10S

Abstract:
A process for the continuous production of slabstock foam by foaming a polyurethane reactive mixture containing carbon dioxide dissolved under pressure, comprising the steps ofa) feeding said polyurethane reactive mixture into a linear extended pressure distribution chamber at a pressure above that of the solubility vapor pressure of said dissolved carbon dioxide,b) reducing pressure to a pressure below said solubility vapor pressure of said dissolved carbon dioxide in a linear extended pressure reduction zone, wherein the linear extent of said pressure distribution chamber and said pressure reduction zone is designed in the shape of a circular ring and said foaming chamber is designed on the inlet side as a circular chamber and on the outlet side as a circular diffusor chamber,c) feeding said polyurethane reactive mixture from said pressure reduction zone into a foaming chamber with a widening cross-section of flow to form a foamed reactive mixture, andd) applying said foamed reactive mixture (froth) substantially perpendicularly and free-flowing onto a conveyer belt of a continuous slabstock foam plant.