Patent · US Expired

Device for making tubing foils

US5354190A · kind A · utility

4Cited by

9References

11Claims

0Family size

Assignee

Alpine Corporation · DE

Inventors

Werner R. Hofer · Friedberg, DE
Franz Mahler · Augsburg, DE
Manfred Goellner · Berlin, DE
Andreas Gumpert · Augsburg, DE

Key dates

Filing date	Jan 25, 1993
Grant date	Oct 11, 1994
Priority date	—
Expiry date	Jan 25, 2013

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29K2023/065
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

In order to make the thickness and strength values uniform in an extruded foil tubing made of high density polyethylene (HDPE), in the form of a long neck, an air nozzle ring is provided at the level of the end of the long neck in addition to an outer blow ring surrounding the ring nozzle of the blow head. The rate of air flow through the nozzles of the air nozzle ring is controlled dependent on a rotating measuring device for measuring the thickness of the foil which is located above the expansion portion of the foil tubing. The cooling effect of the outer blow ring is preferably twenty times greater than that of the air nozzle ring. To stabilize the foil bubble, an inner pin is provided at the level of the end of the long neck.

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