The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 12, 2010
Filed:
Feb. 12, 2007
Franz Mahler, Augsburg, DE;
Christian Baier, Neusas, DE;
Michael Heinecker, Augsburg, DE;
Joachim Libowski, Gersthofen, DE;
Franz Mahler, Augsburg, DE;
Christian Baier, Neusas, DE;
Michael Heinecker, Augsburg, DE;
Joachim Libowski, Gersthofen, DE;
Hosokawa Alpine Aktiengesellschaft, Augsburg, DE;
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.