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:
Jan. 06, 1976
Filed:
Feb. 12, 1974
Applicant:
Inventors:
Werner Josef Zimmermann, Lengerich of Westphalia, DT;
Hartmut Upmeier, Tecklenburg, DT;
Assignee:
Windmoller & Holscher, Lengerich of Westphalia, DT;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B29D / ;
U.S. Cl.
CPC ...
425 72 ; 4253 / ; 4253 / ; 425461 ;
Abstract
In a blow-head for producing tubular film from thermoplastic molten material and comrising a housing with a central supply conduit for the molten material and distributing passages radiating from the supply conduit to a respective distributing helix of an insert member, means for internally cooling the blown film comprise concentric air inlet and outlet passages extending axially of the housing and each connected to at least one inlet tube and one outlet tube, respectively, the tubes being disposed between adjacent said radiating distributing passages and extending to the exterior of the housing.