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:
Jun. 02, 2009
Filed:
Feb. 17, 2005
Edgar Gandelheidt, Worms, DE;
Edgar Gandelheidt, Worms, DE;
Kiefel Extrusion GmbH, Worms, DE;
Abstract
In a first phase, after completion of a production process for plastic films, the blowing head is heated by the heater that is present to a temperature above the melting temperature of the plastic remaining in the blowing head to liquefy the same. In a second phase, at the latest after the liquefied plastic has run out, at least the region of the blowing head that is in contact with the plastic is sealed off from the ambient atmosphere and purged of its oxygen-containing atmosphere. The head is then heated far above the decomposition temperature of the plastic still remaining, and the gaseous products thereby occurring are discharged. At the end of the decomposition phase of the remaining plastic, the blowing head is flushed through with a gas which contains at least a proportion of oxygen, in order to carry out an incineration of residual particles.