Patent · US Active

Blow head for producing blown tubular film

US7811073B2 · kind B2 · utility

5Cited by

32References

3Claims

0Family size

Assignee

HOSOKAWA ALPINE Aktiengesellschaft · DE

Inventors

Franz Mahler · Augsburg, DE
Christian Baier · Alzenau, DE
Michael Heinecker · Augsburg, DE
Joachim Libowski · Gersthofen, DE

Key dates

Filing date	Feb 12, 2007
Grant date	Oct 12, 2010
Priority date	—
Expiry date	Feb 12, 2027

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29L2023/001
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

The invention relates to a blow head for producing blown tubular films from thermoplastic materials. Films produced by conventional blow heads often have dull strips or wavy areas, the so-called spiral strips. The aim of the invention is to avoid these negative film properties. For this purpose, the blow head comprises a plurality of annular gap-shaped melt channels arranged concentrically around the center axis of the blow head, the spiral distributor of the inner melt channel being arranged on the inner limiting wall in relation to the center axis of the blow head and the spiral distributor of the outer melt channel being arranged on the outer limiting wall in relation to the center axis of the blow head.

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