Maschinenfabrik Hennecke Gmbh

Bayer Aktiengesellschaft

Hennecke Gmbh

Other

Bayer Aktiengesellscaft

Ferdinand Althausen

Reiner Raffel

Hans-Michael Sulzbach

Ferdinand Proksa

Wilfried Ebeling

Robert Eiben

Jurgen Wirth

Helmut Duschanek

Kurt Krippl

Herbert Steilen

Willi Schmitzer

Ulrich Osinski

Gottfried Bucher

Ulrich Knipp

Heinrich Boden

Heinz Muller

Bernhard Rentz

Johann Niggemann

Florian Thiebes

Kurt Pieper

Hans M Sulzbach

Jurgen Fietz

Werner Kraft

Ferdinand Proska

Wolfgang Fohr

Helmut Schwesig

Rainer Raffel

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

For the production of polyurethane moldings by the shot process from isocyanate and polyol components, the production is improved in that, in addition to the conditioning already known for the line system, at least one of the commercially available but modified metering pumps is also conditioned in that some of the reaction component made available flows in circulation through the intermediate space between the enclosed metering component and housing of the pump.

Process and device for the production of polyurethane moldings by the shot process

Process and device for producing foam using carbon dioxide dissolved

High-pressure mixing head

A device for removing plastics residue from a cleaning piston having an end face and a mixer head outlet pipe of a counter-current injection mixer head, wherein the device comprises a stripping plunger having a stripping edge; a mortar for receiving the stripping plunger, the mortar comprising an outlet opening for disposing the plastics residue from the mortar which is disposed at an angle to an impact face of the mortar; a hydraulic device for bringing the mixer head and the stripping plunger towards each other in the cleaning position, in which the stripping edge of the stripping plunger is aligned with the end face of the cleaning piston, wherein the axis of the cleaning piston is situated between the mortar and the stripping plunger; and a hydraulic device for moving the stripping plunger parallel to the end face of the cleaning piston into the mortar and towards the impact face of the mortar.

Device for removing plastics residues from mixer head outlet pipes

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

For the expansion of a liquid containing gas under pressure in dissolved form, it is proposed that the liquid be passed with expansion through an extended flow channel with a small cross-sectional measurement with generation of high rates of shear. The velocity of the liquid is then reduced prior to the foaming.

Apparatus for foam manufacturing using carbon dioxide dissolved under

An apparatus for preparing flowable reaction mixtures from at least two flowable reactants in which the components are injected into a mixing chamber by means of injection nozzles, the force of the reactant acting upon the nozzle needle is at least substantially compensated to avoid impairing the mixing ratio during a change-over of the nozzle needle. The rear end of the nozzle needle is provided with a chamber communicating with the component supply line.

Apparatus for preparing flowable reaction mixtures from at least two

Method and apparatus for foam manufacture using carbon dioxide dissolved

A process and device for foaming casings, particularly refrigerator casings, with a blowing agent which can form an explosive mixture with atmospheric oxygen during evaporation which reduce the risk of explosion by introducing inert gas into the space in which the foam is to be formed by means of a servo-controlled inlet valve.

Process and device for producing foam casings with CFC-free polyurethane

A method and apparatus for continuously dispersing fine particle-sized solids in liquids by a continuous process, in which a constant stream of liquid is fed into a mixing apparatus and fine-particle-sized solids are metered into the mixing apparatus by means of a metering screw as a function of the pressure prevailing in the mixing apparatus. The solids conveyed by the metering screw are supplied from an intermediate vacuum tank with a controlled filler level.

Method and apparatus for continuously dispersing fine particle-sized

In a fine comminution apparatus arranged downstream of a coarse comminution apparatus, polyurethane foam wastes can be comminuted to the desired particle size for recycling as an additive in the production of polyurethane, in a low-dust and energy-saving manner, by carrying out the fine comminution preferably by repeatedly forcing a mixture of the coarsely comminuted material and one of the reaction components through a nozzle or through a plurality of nozzles.

Process and apparatus for reprocessing polyurethane foam wastes, in

A process and apparatus are described for the production of a flowable reaction mixture from at least two flowable reactive components which may be difficult to mix, which components react with one another to form a solid or a foam material. The components are injected into a mixing zone where the components are mixed in a continuous flow. The mixture flowing from the throttling zone is divided into two sub-streams which flow around a piston and which recombine opposite the division point.

Process and apparatus for the production of a flowable reaction mixture

The variations in the delivery rate of additive caused by fluctuations in a system for the preparation of a polyurethane reaction mixture from flowable reactants and an additive, in particular a blowing agent, are kept within negligible limits by subdividing the supply pipe (4) to the mixing head (6) into a main pipe (8) and a subpipe (9) and introducing the additive into the side stream, which is substantially smaller than the main stream.

Process and apparatus for the preparation of a polyurethane reaction

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Neunkirchen, Germany

Ferdinand Althausen