Process and equipment to regulate the thickness of oriented tubular film that is manufactured in a film blowing process

US12343920B2 · kind B2 · utility

Assignee

• HOSOKAWA ALPINE Aktiengesellschaft · DE

Inventors

• Bernd Bayer · Bobingen, DE
• Georg Scharpf · Балка Пшехская, DE
• Hans-Peter Schüle · Augsburg, DE

Key dates

• Filing date: Jan 23, 2023
• Grant date: Jul 1, 2025
• Expiry date: Jun 28, 2043

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29C2948/92942
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

The thickness profile of a film tube manufactured using a film blowing process is regulated using a control system consisting of segmented control zones and at least at two measuring units for the film thickness such that the specified target film thickness profile exhibits deviations from a uniform film thickness in the form of one or two thin spots opposite each other, which serve to compensate for film thickness changes across the film width which occur during the monoaxial orientation in machine direction so that a film web is produced as a result of orientation whose thickness profile has as few deviations as possible from the target thickness across the entire width of the film web, the final film should exhibit a thickness profile where the thickness increase from the middle of the film to the edges is as minor as possible and the flatness of the film is improved.