Roehm Gmbh & Co Kg

Evonik Roehm Gmbh

Evonik Rohm Gmbh

Michael Zietek

Werner Hoess

Rudolf Blass

Klaus Albrecht

Hans-Juergen Kress

Klaus Schultes

Michael Wicker

Thomas Hasskerl

Michael Enders

Arne Schmidt

Alexander Theil

Sven Schroebel

Christian Eberle

Werner Höss

Heinrich Gaul

Harry Schwarz

Werner HÖSS

Sven SCHRÖBEL

Hans-Jürgen Kress

The invention describes a transparent plastics composite composed of PMMA and TPU with excellent mechanical properties.

Transparent plastic composite

The invention relates to a moulding composition and to the mouldings which can be produced therefrom. Due to their good resistance in the hot water cycle test and in the hot-water/isopropanol test, the plastics mouldings have particularly good suitability for the production of sanitary components.

Articles made of PMMA molding compound

The invention relates to a shaping tool for the injection molding or injection compression of information carrier disc blanks ( ) made of polymethacrylate plastic which is suited as a component of an injection molding or injection compression machine. The shaping tool is comprised of two mold parts ( ), whereby one mold part ( ) contains a bottom part ( ) of a mold with the information data and, together with the second mold part ( ), forms a cavity for the one information carrier blank and one sprue bush ( ) for a sprue piece ( ) in the tool having a concentrically positioned feed orifice ( ). In addition, the tool comprises a impact cylinder ( ) for shearing the sprue piece ( ) and has an ejector pin ( ). The invention is characterized in that the injection gap (SP) between the feed orifice ( ) of the sprue piece ( ) and the information carrier disc blank ( ) is less than 0.3 mm. In addition, the cutting gap (SN) between the edge of the impact cylinder ( ) and the information carrier disc blank ( ) is less than 0.2 mm.

Shaping tool for information carrier disc blanks

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Ober-Ramstadt, Germany

Michael Zietek