Bayer Aktiengesellschaft

Hans Radojewski

Frank Gerald Kleiner

Hans-Werner Depcik

Karl-Heinz Muller

Klaus Heidenreich

Richard Muhlbauer

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 process for the production of cross-linked polyethylene foam layers which have an anisotropic pore structure in at least one internal layer, wherein at least three polyethylene sheets which contain equal quantities of peroxide as cross-linking agent and differing quantities of a chemical blowing agent are arranged as a multilayer structure in such a way that the two external layers are formed by the sheets which contain a smaller proportion of blowing agent, and the structure is heated, preferably in a continuous heating furnace, so that the individual sheets are cross-linked and at the same time welded together to form a laminate which is subsequently foamed by increasing the temperature to between 190.degree. and 250.degree. C.

Growing community of inventors

Leverkusen, Germany

Hans Radojewski