Blow head for producing blown tubular film

Details Blow head for producing blown tubular film Blow head for producing blown tubular film

2007-02-12

2010-10-12

Hug, Eric (Department: 1791)

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

Extrusion shaping means

C425S191000, C425S380000, C425S381200, C425S382400, C425S462000

Reexamination Certificate

active

07811073

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.

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