Method and device for cleaning a blowing head for plastic films

Details Method and device for cleaning a blowing head for plastic films Method and device for cleaning a blowing head for plastic films

B - Operations, Transporting

29

C

B29C 49/42 (2006.01) B08B 5/02 (2006.01) B08B 9/027 (2006.01) B29C 47/08 (2006.01)

Patent

CA 2497472

The method for cleaning a blowing head which serves for producing plastic films comprises the features that initially, in a first phase, after completion of the production process, 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, that, 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 and is heated far above the decomposition temperature of the plastic still remaining, and the gaseous products thereby occurring are discharged, and that, 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.

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