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:
Jul. 11, 1989
Filed:
Sep. 15, 1988
Peter Albrecht, Hamburg, DE;
Adolf Appel, Egestorf, DE;
Karl-Heinz Balkau, Oststeinbek, DE;
Edward Clar, Hamburg, DE;
Claus Horwege, Hamburg, DE;
Wolfgang Reymann, Hamburg, DE;
Klaus Vogel, Barsbuttel, DE;
Walter Wiedenfeld, Hamburg, DE;
Krupp Corpoplast Maschinenbau GmbH, Hamburg, DE;
Abstract
A process for producing hollow bodies from oriented thermoplastic material wherein a cylindrical portion of a heated hollow preform which has a bottom thereon is subjected to stretching at a starting temperature which is below the vitreous transition temperature of the thermoplastic material, with the wall thickness of the preform being reduced in the stretching operation. Prior to the stretching operation the preform is heated in the portion in which the stretching effect begins, to a temperature higher than in the portion adjoining same. Stretching is preferably effected along the axis of the preform at different rates such that in the portion of the preform at which stretching begins, stretching is effected at a lower rate than in the portion adjoining same in the stretching direction.