Process for producing a deep-drawn article from a partially-crystalline polymeric material

US4740335A · kind A · utility

Assignee

• Firma Carl Freudenberg · DE

Inventors

• Hans-Gunter Scholz · Weinheim, DE
• Gerhard Graab · Mannheim, DE

Key dates

• Filing date: Aug 4, 1986
• Grant date: Apr 26, 1988
• Expiry date: Aug 4, 2006

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S264/65
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A process for producing a surface-embossed, deep-drawn article suitable for an interior finish or lining of a motor vehicle, for example, starts with a partially-crystalline polymeric material, i.e., one having crystallites, in film form. The film-form material is heated to a temperature below the melting point of its crystallites an surface embossed. The embossed material is then cooled and crosslinked. The crosslinking is preferably done by irradiating the cooled material with a high-energy beam such as an accelerated electron beam, for example. The cooled and crosslinked material is then reheated, this time to a temperature above the melting point of its crystallites, and deep drawn into the shape of the article.