The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 29, 2003
Filed:
Mar. 19, 2001
Michael Zietek, Ober-Ramstadt, DE;
Harry Schwarz, Guetersloh, DE;
Klaus Albrecht, Mainz-Hechtsheim, DE;
Rudolf Blass, Darmstadt, DE;
Werner Hoess, Heusenstamm, DE;
Hans-Juergen Kress, Bruehl, DE;
Michael Wicker, Seeheim-Jugenheim, DE;
Roehm GmbH & Co. KG, Darmstadt, DE;
Abstract
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.