Patent · US Expired

Apparatus for the continuous production of biaxially-stretched blown plastic foil

US5891480A · kind A · utility

6Cited by

1References

5Claims

0Family size

Assignee

REIFENHÄUSER GMBH & CO. KG MASCHINENFABRIK · DE

Inventors

Claus Schmidt · Regensburg, DE
Josef Nowak · Siegburg, DE

Key dates

Filing date	Jan 28, 1997
Grant date	Apr 6, 1999
Priority date	—
Expiry date	Jan 28, 2017

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29C48/10
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A foil-blowing apparatus and start-up method utilizes switchable roller pairs and a seal in an upstream primary tube stretch to subdivide the interior of the primary tube into an upper chamber and a lower chamber, the lower chamber being in communication with a rising stretch of the primary tube with the tube in a heating chamber which brings the extruded tube to a foil-blowing temperature. The foil is blown by the pressure in the lower pressure chamber, at least during start up.

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