Patent · US Active

Method and device for longitudinal drawing of a film web

US7596839B2 · kind B2 · utility

2Cited by

15References

26Claims

0Family size

Assignee

Treofan Germany GmbH & Co. KG · DE

Inventors

Detlef Busch · Saarlouis, DE
Albrecht Freynhofer · Schiffweiler, DE
Gerhard Koch · Nagold, DE
Michael Thull · Heusweiler, DE

Key dates

Filing date	Jan 17, 2005
Grant date	Oct 6, 2009
Priority date	—
Expiry date	Jun 21, 2026

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29C55/06
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

The invention relates to a device for drawing a film web, made from a thermoplastic plastic, comprising at least one driven roller (2), driven at a speed V1 and at least one second driven roller (3), driven at a speed V2, where V1<V2. The rollers (2, 3) are serially arranged such that a drawing gap (4) is embodied between the two rollers (2, 3). A width-maintaining device is arranged in the drawing gap (4), which mechanically grips both edges of the film web such that the width of the film web is essentially maintained during the longitudinal drawing in the drawing gap (4). The invention further relates to a method for the longitudinal drawing of films which are drawn by means of said device.

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