Patent · US Active

Method and device for the transverse drawing of a material web

US9180622B2 · kind B2 · utility

0Cited by

5References

24Claims

0Family size

Assignee

Treofan Germany GmbH & Co. KG · DE

Inventors

Leo Wintrich · Gilching, DE
Robert Hansohn · Kirkel, DE

Key dates

Filing date	May 9, 2006
Grant date	Nov 10, 2015
Priority date	—
Expiry date	Jan 17, 2028

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29C35/02
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

The invention relates to a method for the transverse drawing of an unoriented or longitudinally-oriented film web made from thermoplastic plastic. According to said method, an undrawn or longitudinally-drawn film (8) is introduced into a transverse drawing frame in which heater fields (1) are heated to a transverse drawing temperature TQ, in the attached drawing fields (2) a clip chain is drawn in the transverse direction by divergent (V-shaped) guides and a temperature TF is applied to fixing fields where TQ>TF. In the drawing fields and/or the heating fields (1) the boundary zones (5) of the film (8) are heated or thermally insulated such that the boundary zones (5) of the film (8) have a higher temperature than the middle of the film web (6) on transverse drawing and/or fixing.

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