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AssigneeDynamit Nobel Aktiengesellschaft
InventorsKlaus Bruning, Hans Junger, Wolfgang Pungs, Peter Rheinfeld, Franz Weissenfels, Michael Wienand
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An apparatus for the continuous manufacture of phenolic resin foam in an endless sheet which includes mixing means for 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.degree. 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.
In an apparatus for the continuous manufacture of phenolic resin foam wherein the components of the foam are stored in storage means operatively associated with means for mixing the components and for distributing the resulting mixture to a temperature-controllable double belt press having an upper and a lower belt defining a molding zone therebetween, the improvement which comprises means for cooling the phenolic resin component to a desired premix temperature operatively associated with said storage means, a first mixer means downstream of the cooling means for premixing the cooled phenolic resin component with a blowing agent, a second mixer means downstream of the first mixer means for mixing the premix of phenolic resin and blowing agent with foam additives and a curing agent;
An apparatus for manufacturing a resin foam from a foamable resin mixture comprising a temperature-controllable double-band press including upper and lower rotating endless conveyor belts forming a laterally limited longitudinally extending mold interspace, means operatively associated with said double-band press for vertically adjusting the upper belt in dependence on the foaming pressure of the foamable resin mixture in said mold interspace whereby the thickness of the foam produced is varied, supply means operatively associated with said press for supplying said foamable resin mixture to said mold interspace, and measuring means operatively associated with said press for measuring the foaming pressure of the foamable resin mixture in said mold interspace.
An apparatus for manufacturing a resin foam from a foamable resin mixture comprising a temperature-controllable double-band press including upper and lower rotating endless conveyor belts forming a laterally limited longitudinally extending mold interspace, supply means operatively associated with said press for supplying said foamable resin mixture to said mold interspace, measuring means operatively associated with said press for measuring the foaming pressure of the foamable resin mixture in said mold interspace, and means operatively associated with said press for vertically adjusting the upper belt of said double-band press in dependence on the foaming pressure of the foamable resin mixture in said mold interspace whereby the thickness of said mold interspace along the length thereof is varied in dependence on said foaming pressure.
Dependencies are inferred from the claim text.