Patent · US Expired

Process for the production of biaxially stretched films and apparatus for carrying out the process

US5833904A · kind A · utility

4Cited by

9References

23Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Winfried Muskalla · Eltville am Rhein, DE
Robert Schmidt · Eltville am Rhein, DE
Karl-Heinz Kochem · Neunkirchen, DE

Key dates

Filing date	Mar 8, 1996
Grant date	Nov 10, 1998
Priority date	—
Expiry date	Mar 8, 2016

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29C2035/1616
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

In a for the production of biaxially stretched films, a take-off roll 4 is arranged downstream of a draw-off roll 3 . A plastic melt is formed into an initial film by means of a slot die 1, cooled on the draw-off roll 3 and passed over the take-off roll 4 which has a predetermined surface roughness. The film is then biaxially stretched and heat-set.

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