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A process and a system for the continuous manufacture of polymeric foams. Reactive chemical components and additives comprising a low boiling blowing agent are mixed under pressure; the mixture is then frothed before chemical reaction takes place by feeding the mixture through a pressure equalizing

A process and a system for the continuous manufacture of polymeric foams. Reactive chemical components and additives comprising a low boiling blowing agent are mixed under pressure; the mixture is then frothed before chemical reaction takes place by feeding the mixture through a pressure equalizing and frothing device having a pressure-drop zone opening into a frothing cavity having an output aperture to discharge the froth onto a moving substrate.

대표청구항 ▼

A system suitable for the continuous production of polymeric slab-stock foam on a moving substrate comprising: a mixing device for mixing reactive chemical components and liquid CO2 blowing agent under pressure, a feed line for carrying the mixture to a frothing device comprising a pressure equalizi

A system suitable for the continuous production of polymeric slab-stock foam on a moving substrate comprising: a mixing device for mixing reactive chemical components and liquid CO2 blowing agent under pressure, a feed line for carrying the mixture to a frothing device comprising a pressure equalizing chamber provided with a pressure drop zone dimensioned to maintain back pressure on the upstream mixture to keep the liquid CO2 in a liquid state and to initiate frothing under pressure controlled conditions to avoid turbulent evaporation of the blowing agent upon discharge of the mixture from the pressure drop zone, and a frothing cavity having an outlet aperture extending transversely across the moving direction of the substrate and forming the discharged mixture into a progressively non-reactive expanding frothing material by progressively releasing the CO2 in the frothing material as the frothing material flows along the frothing cavity.