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:
Aug. 08, 1978
Filed:
Mar. 14, 1977
Werner Josef Zimmermann, Lengerich of Westphalia, DE;
Windmoller & Holscher, Lengerich of Westphalia, DE;
Abstract
Cooling apparatus for tubular plastics film made by a film blowhead has provision for air cooling and for replacement of the internal cooling air through a central aperture in the blowhead. The cooling apparatus comprises superposed cooling air supply rings having outlet apertures facing the inside of the film and apertures extending axially through the air supply rings for the passage of the cooling air from the lower into the higher air supply rings and radial apertures for withdrawing the cooling air that is blown out of the outlet apertures between the air supply rings. The air supply rings consist of superposed cylindrical rings interconnected by tubular webs that pass through the rings and form radial apertures, the rings being supported on one another at least by their inner ring portions and bounding an annular passage between each other.