Apparatus for the continuous manufacture of phenolic resin foam

Details Apparatus for the continuous manufacture of phenolic resin foam Apparatus for the continuous manufacture of phenolic resin foam

1975-02-13

1976-12-28

Husar, Francis S.

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Molding pressure control means responsive to pressure at...

425371, 425471, 425817C, 425329, B29D 2704

Patent

active

039992306

ABSTRACT:
An apparatus for the continuous manufacture of phenolic resin foam in an endless sheet which includes means for mixing expandable liquid phenolic resin with a blowing agent and an acid-containing curing agent, optionally with the addition of additives, and means for processing the mixture in a temperature-controllable double belt press. The apparatus also comprises a device for cooling the phenolic resin to a temperature of from about 8 to about 15.degree. C., a mixing section for admixing a blowing agent under a high pressure with said resin to form a resin premix, for mixing said resin premix with a curing agent resin to form a resin premix, and mixing said resin premix with a curing agent and other foam additives to form a curable reaction mixture, an applicator device for continuously applying said mixture uniformily onto a moving substrate, a unit for covering the mixture on said substrate with a continuous protective layer, a conveyor belt for passing the covered mixture into the double belt press, means for heating the belt press to promote foaming of the mixture under pressure until a desired sheet thickness has been obtained and a device for measuring the foam pressure within said belt press so that the foaming pressure and also the sheet thickness can be regulated.

REFERENCES:
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patent: 3144376 (1964-08-01), Plumberg et al.
patent: 3152361 (1964-10-01), Edwards
patent: 3178768 (1965-04-01), Edberg
patent: 3383441 (1968-05-01), Norrhede et al.
patent: 3566448 (1971-03-01), Ernst
patent: 3706516 (1972-12-01), Kisteneich et al.
patent: 3761209 (1973-09-01), Hanton
patent: 3773876 (1973-11-01), Rath et al.
patent: 3812227 (1974-05-01), Blackwell et al.

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