Patent · US Active

Process to regulate the thickness of oriented blown film

US9302423B2 · kind B2 · utility

4Cited by

9References

18Claims

0Family size

Assignee

Hosakawa Alpine Aktiengesellschaft · DE

Inventors

Bernd Bayer · Bobingen, DE
Lothar Klimek · Bobingen, DE
Holger Niemeier · Augsburg, DE

Key dates

Filing date	Jul 7, 2010
Grant date	Apr 5, 2016
Priority date	—
Expiry date	Sep 26, 2032

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29L2023/001
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

The invention relates to a process to regulate the film thickness of tubular film manufactured using a film blowing process, wherein the film is laid flat and repositioned using an oscillating take-off unit and subsequently monoaxially oriented in machine direction using an orientation unit. This process produces a film whose thickness profile has as few deviations as possible from the average film thickness across the film width. This result is achieved by setting the film thickness profile of tubular film produced with a film blowing line such that after orientation and as a result of deviations during orientation, a film thickness profile develops that is uniform across the entire film width.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.