Maschinenfabrik Hennecke Gmbh

Bayer Aktiengesellschaft

Hennecke Gmbh

Other

Bayer Aktiengesellscaft

Reiner Raffel

Hans-Michael Sulzbach

Ferdinand Althausen

Ferdinand Proksa

Wilfried Ebeling

Robert Eiben

Herbert Steilen

Jurgen Wirth

Jürgen Wirth

Helmut Duschanek

Kurt Krippl

Willi Schmitzer

Florian Thiebes

Gottfried Bucher

Lothar Röhrig

Hans Klonk

Klaus Schulte

Ulrich Knipp

Heinrich Boden

Heinz Muller

Bernhard Rentz

Wolfgang Pawlik

Martin Schamberg

Klaus Nadolski

Johann Niggemann

Gerd Reffelmann

Michael Begemann

Gunter Hauptmann

Wolfgang Fohr

Ferinand Althausen

Helmut Schwesig

Ferdinand Proska

Hans M Sulzbach

Helmuth Duschanek

Lothar R&ouml;hrig

Althausen

Jurgen Fietz

The present invention relates to a process for the continuous production of polyurethane sandwich elements comprising an upper outer layer and a lower outer layer and a layer of cellular polyurethane lying in between, which is firmly bonded to the outer layers. This invention also relates to an apparatus suitable for the production of polyurethane sandwich elements as described above.

Apparatus for the production of polyurethane sandwich elements

The invention relates to a mixing head and to a method of mixing at least one polyol component and at least one isocyanate component and where appropriate additives, to form a polyurethane reaction mixture.

Multiple component mixing head

The present invention relates to a method for the continuous mixing of at least one polyol component and at least one isocyanate component and optionally additives to form a polyurethane reaction mixture in a stirrer mixer with an axially conveying stirrer.

Method for mixing a polyol component and an isocyanate component

Slabstock foam free of cavities can be produced without any restriction, i.e. also from rapidly reacting chemical systems, by introducing the liquid reaction mixture from underneath, in front of, and/or through an optionally swivellable floor plate, wherein the floor plate and the inlet for introducing the liquid reaction mixture is arranged in a manner such that the reaction mixture above the floor plate is substantially still liquid.

Process and apparatus for the continuous production of slabstock foam

Process for the continuous production of slabstock foam

The invention relates to a method for the production of polyurethane block foam, wherein a polyurethane reactive mixture containing carbon dioxide is suddenly relieved from a pressure above the pressure breaking the equilibrium of the carbon dioxide to a normal pressure, wherein the liquid polyurethane reactive mixture is foamed by releasing dissolved carbon dioxide. The foamed mixture is placed on a substrate and then hardened into block foam, wherein the carbon dioxide or at least one of the components polyol and isocyanate is initially dissolved in the reactive mixture at a pressure that is substantially above the pressure breaking the equilibrium, the pressure is subsequently lowered to a pressure close to the pressure breaking the equilibrium, wherein the pressure falls below the pressure breaking the equilibrium by releasing small amounts of carbon dioxide and forming a microdispersion of bubbles, the components are optionally mixed and a sudden pressure drop to normal pressure occurs before the carbon dioxide released is completely dissolved.

Method for the production block foam

A process is described for producing foam materials from two-component reactive plastics using carbon dioxide as blowing agent by mixing at least one of the reactive components with carbon dioxide under pressure, mixing the components, at least one of which contains carbon dioxide under pressure, expanding the reactive mixture containing carbon dioxide obtained by mixing, and hardening, wherein the expansion takes place suddenly with the production of high rates of shear. Preferably the rate of flow of the reaction mixture is reduced after expansion.

Process and device for producing foam using carbon dioxide dissolved under pressure

Polyurethane molded articles are produced from a flowable polyol-polyisocyanate reaction mixture on a shot-wise basis. The flowable reaction mixture is formed by combining the components of that mixture in the mixing chamber of a mixhead. The contents of the mixhead are introduced (preferably via an outlet pipe) into a mold in a manner such that the mixing chamber is substantially emptied in each case. Any ambient gas in the mixing chamber is then removed before the respective next shot is initiated.

Process and device for producing plastic moldings from a flowable reaction mixture

Flowable reaction components of a reaction mixture which form solid or foamed material comprising filling material are transported from a storage container to a high-pressure mixing head in pressure stages by the use of gear pumps connected in series without major wear of the gear pumps.

Process and device for pressurizing flowable reaction components

Reaction mixtures which form polyurethane foamed material, with production conditions which are varied during production, e.g. variation of the proportion of foaming agent, variation of the ratio of reaction components, variation of the throughput, or fine adjustment, can be produced by employing an improved apparatus which comprises a depressurisation element (creamer) ( ), wherein a perforated plate or sieve plate constructed as a first throttle plate ( ), and a second perforated or sieve plate, which is constructed as a throttle plate ( ) and which is disposed downstream thereof, are disposed in the creamer ( ), wherein the spacing a between these two throttle plates ( ) can be varied during operation in accordance with the variable production conditions, and wherein a calming element ( ) is disposed after the second throttle plate ( ) in the direction of flow.

Apparatus for the production of foamed material from a reaction mixture containing a dissolved foaming agent

Process and device for producing foam using carbon dioxide dissolved

Process for foam production using dissolved under pressure carbon dioxide

A process and device for the continuous production of slabstock foam by foaming a polyurethane reactive mixture containing carbon dioxide dissolved under pressure, comprising the steps of

Process for foam production using carbon dioxide dissolved under pressure

A method and device are described for the production of foams from two-component reactive mixtures using carbon dioxide as expanding agent, by mixing at least one of the reactive components with carbon dioxide under pressure. That mixture is then mixed with the other reactive component(s) to form a foamable reactive mixture, which is expanded and cured to form the final product. The foamable reactive mixture is expanded to ambient pressure through at least one fine-meshed screen (21a, 21b, 21c).

Method and device for the production of foam using carbon dioxide

A process and a device are described for the production of polyurethane foam by application of a froth onto the conveyor belt of a block-foam installation, whereby the froth is applied onto the lower conveyor belt in a free, substantially vertical fall and flowing of the froth contrary to the direction of movement of the conveyor belt is prevented by a stationary, substantially vertical barrier arranged transversely on the conveyor belt.

Process and device for continuous production of polyurethane block foam

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Siegburg, Germany

Reiner Raffel