Method of making a blow-moulded container from a thermoplastic polyester, in particular pet

US4933135A · kind A · utility

Assignee

• Krupp Corpoplast Maschinenbau GmbH · DE

Inventors

• Claus Horwege · Hamburg, DE
• Wolfgang Reymann · Hamburg, DE

Key dates

• Filing date: Nov 21, 1988
• Grant date: Jun 12, 1990
• Expiry date: Nov 21, 2008

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S264/908
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

To improve the properties of biaxially orientated blow-moulded containers of PET the mouth region of the container serving for fitting a closure member is heat-set, i.e. crystallized at elevated temperature. The heat-setting is effected at the mouth end of a parison or preform and the previously heat-set mouth end is then reshaped to the finished mouth portion. This improves the dimensional stability of the mouth region.