Process for preparing a web of film prior to winding it into a wound roll

US4185068A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Willi Schmidt · Blankenloch, DE
• Norbert Roth · Kiel, DE

Key dates

• Filing date: May 3, 1978
• Grant date: Jan 22, 1980
• Expiry date: May 3, 1998

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29C48/08
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

This invention relates to a process for continuously preparing a web of thermoplastic flat film for a subsequent winding operation, by providing it with embossed lines, preferably one line along each edge or very near each edge of the web, which process comprises embossing the lines while the film web is in a thermal state in which the tensioned film may be easily embossed, and is tensioned in all directions without undergoing a stretching operation effecting a dimensional change of the film web, and then cooling the embossed web of film.