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:
Nov. 15, 1988
Filed:
Jul. 13, 1987
Hartmut Halter, Troisdorf-Eschmar, DE;
Reifenhauser GmbH & Co. Maschinenfabrik, Troisdorf, DE;
Abstract
The apparatus for making a plastic foil by blowing into an extruded thermoplastic tube comprises a rotating extruder head with at least one circular outlet gap for the plastic tube, an air blowing device and a cooling device including two circular cooling air outlets surrounding the circular outlet gap of the extruder head. Cooling air duct structures are connected to a common cooling air blower. A cooling air distributor unit has a cooling air feed device for each cooling air outlet. The cooling air feed devices are aerodynamically independent of each other. The aerodynamically independent cooling air feed devices are connected to a common cooling air duct structure. Each cooling air feed device has an air flow control device.