Bayer Aktiengesellschaft

Hans-Werner Depcik

Karsten Fahner

Alfred Pischtschan

Hans G Fitzky

Helmut Schmid

Axel Kaminski

Friedrich Johannaber

Karl Huff

Hans Radojewski

Dieter Schauf

Rudiger Van Hooren

Karl Oberbach

Mehmet C Yesildag

Klaus Protoschill

Klaus Heidenreich

Eckard Foltin

Reiner Erkelenz

Ulrich Schutz

Sunk spots in critical regions of a plastics injection moulded part are prevented by localized heating of the marginal zone of the part in the course of the production cycle by means of a high frequency electromagnetic field and application of a pressure in this region.

Process for improving the quality of injection moulded parts

Plastic containing small amounts of titanium dioxide and, if appropriate, carbon black and an additive which reduces the tracking resistance, for the production of laser-writable mouldings.

Laser-writable material

An identification mark which remains permanently readable is applied by means of a laser beam through a lightwave window of plastics material to a plastics layer situated behind that window.

Composite plastic with laser altered internal material properties

By means of a piston-like movement, solid fillings, for example of mineral fibers or steel wool, introduced in the pressureless zone of a screw are incorporated in the molten plastic and the resulting mixture formed in a mold. The finished molding contains numerous fillings greater than 2 mm in length which inter alia contribute significantly towards improving its strength.

Plastics moulding containing reinforced fillings

A mass is cooled systematically under the influence of an electrical or mechanical alternating field to obtain a quasi dielectric isotropic structure of a synthetic resin part.

Synthetic resin parts with quasi dielectric isotropic structure

The present invention reduces within a short period of time the internal stresses in plastics bottles by annealing with infra-red radiation, in particular by specifically exposing critical points to radiation.

Process for annealing thermoplastically-shaped plastics parts

A unitary wheel is injection molded from reinforced thermoplastic material in such a manner that the melt streams of material meet and coalesce in the spokes of the wheel. This wheel has improved strength since the melt streams do not meet and coalesce in the rim portion thereby making the rim impact resistant. Coalescence of the melt streams in the spokes of the wheel is accomplished by introducing the streams into certain of the spokes while separating those spokes from each other by an odd number of intermediary spokes to which no material is directly injected.

Growing community of inventors

Duesseldorf, Germany

Hans-Werner Depcik