Bayer Aktiengesellschaft

Heinrich Ersfeld

Klaus Schulte

Heinrich Boden

Klaus Nadolski

Wilfried Ebeling

Karl D Kreuer

Walter Schneider

Bernhard Rentz

Hans Wirtz

Christian Wolfrum

A process is described for the production of a curable multi-component reaction mixture (and, in particular, a polyurethane), containing filler in which the reaction components are premixed and then mixed with the dry filler in a friction mixer having a conically shaped screw rotatable in a conical mixing chamber. The friction mixer is preferably operated under a fractional load at a low rotational speed.

Process for the production of a filled reaction mixture

The present invention is directed to a process and apparatus for production liquid reaction mixtures. The invention includes a mix head with a mixing chamber which receives reactants through nozzle openings. The key feature resides in placing an impingement surface between at least one of the nozzle openings of the mix head and the mixing chamber itself.

Apparatus for the continuous preparation of a liquid reaction mixture

A piston metering device for the production of a plastic material from at least two flowable reaction components. This device is basically composed of (a) a hydraulic driving mechanism, (b) two piston cylinder units, (c) a mixer head and, optionally, (d) a control device common to at least one of the piston cylinder units. This device permits rapid and simple adjustment of the metering ratio of reaction components by adjustment of throughput. Such adjustment is accomplished by means of regulating elements made of hydraulic motors rigidly coupled to one another.

Piston metering device for the production of plastic material from at

Apparatus for producing moldings from flowable reactive components comprising

Apparatus for the production of moldings from flowable reactive

The instant invention is directed to a mixing head for mixing at least tw flowable components which preferably form a foam during their reaction. The mixing head comprises a housing, in which a guide bore for a discharge piston is positioned, one section of this guide bore being designed as a mixing chamber, into which nozzle openings of injection members, positioned equidistant around the housing, discharge. In the mixing position of the discharge piston, the mixing chamber is bounded by the leading edge of the piston, with an outlet opening being provided opposite the piston. A choke member, which adjoins the mixing chamber and is movably positioned in a guide recess extending perpendicular to the guide bore and transversely beyond the axis or plane of the injection members, has a passage, the cross section of which corresponds to the cross section of the discharge piston such that the piston may enter this passage in its cleaning position. Further, the guide recess and the choke member have sections of reduced cross-sectional areas toward the mixing chamber, these sections extending into the mixing chamber, but leaving the mixing chamber clear.

Mixing head for mixing at least two flowable components

The instant invention is directed to an injection nozzle for mixheads for the production of foams or solids from at least two flowable reaction components, comprising a nozzle housing with a nozzle needle guided in it which is provided with a positive control and cooperates with a nozzle opening, wherein a feed pipe and a return pipe end upstream of the nozzle opening in said nozzle housing and wherein said nozzle needle in its closed position connects said feed pipe and said return pipe to each other via a connecting channel, characterized in that said nozzle needle is divided into a needle core and a needle sleeve which surrounds said needle core and is guided on it, wherein said needle core cooperates with said nozzle opening and is pin-less in design and wherein said needle sleeve is provided with said connecting channel; and in that, when switching over from injection to return, said needle core is located in the closed position sooner than said needle sleeve in the return position, and when switching over from return to injection, said needle sleeve adopts the interruption position before said needle core occupies the open position.

Injection nozzle for mixheads

The invention is directed to an apparatus for the preparation of a reaction mixture, from fluid components, comprising storage tanks, feed pipes leading from said storage tanks to a mixing head via metering pumps and opening into a mixing chamber via injection apertures, said mixing chamber formed by the bore of a housing, a control piston displaceable within said bore and being capable of blocking flow through said apertures, return lines branching off upstream of said apertures and leading up to said storage tanks, and a shut-off means for stopping the flow of said material through at least one of said return lines, the activation of said shut-off means being dependent upon the position of said control piston within said bore.

Apparatus for the preparation of a reaction mixture from fluid components

The invention relates to a method, and an apparatus, for the production of articles which consist of filler-containing synthetic material, in particular a foam, wherein flowable reactants, at least one of which has previously been charged with filler, are injected into a mixing zone under predetermined injection pressures, wherein the reaction mixture is subsequently introduced into a mold. Cellular materials such as flexible, semi-rigid, rigid or structured foam based, for example, on polyurethane or isocyanurate, and also non-cellular materials such as elastomers, may be produced by methods of this type.

Method and an apparatus for the production of articles which consist of

The instant invention is directed to a mixing head for mixing reactants preferably for the production of foam. The mixing head is characterized as having a housing in which an ejector piston is guided, the guide bore of said piston being crossed by a guide bore for a restrictor slide which has a passage for the ejector piston, an outlet element being situated immediately subjacent to said passage, and, in the most preferable embodiment, the restrictor slide and ejector piston being connected to a control device.

Growing community of inventors

Leverkusen, Germany

Heinrich Ersfeld