Hoechst Aktiengesellschaft

Ted Bildplatten Aktiengesellschaft

Aeg-telefunken-teldec

Bruno Rybka

Heinz Borchard

Herbert Knothe

Rainer Mucke

Hans-Joachim Andrascheck

Werner Lorz

Robert Kasch

Jurgen Buck

A rigid polyvinyl chloride foil with modified impact resistance and free from plasticizer especially suitable for the manufacture of audio-visual information carriers with stamped spiral grooves from which the information is played back by pressure scanning. The foil is characterized by a special combination of properties such as flow, reduction in length, toughness, surface resistance, elasticity, peak-to-valley height and surface deposit.

Plastics foil for the manufacture of audio-visual information carriers

A grinding foil which is to be used for grinding a record cutting or playback stylus is manufactured by providing a surface layer of a plastic foil with indentations for accommodating a grinding agent in granular form, filling the indentations with such grinding agent, and thermoplastically deforming the surface layer to smooth the foil surface and to bond the grinding agent into the surface layer.

Method for producing a grinding foil

Growing community of inventors

Nortorf, Germany

Bruno Rybka