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

2005-02-17

2009-06-02

Markoff, Alexander (Department: 1792)

Cleaning and liquid contact with solids

Processes

Hollow work, internal surface treatment

C134S022120, C134S019000

Reexamination Certificate

active

07540291

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.

REFERENCES:
patent: 3228064 (1966-01-01), Plummer
patent: 4233496 (1980-11-01), Weber et al.
patent: 4605365 (1986-08-01), Upmeier
patent: 4919161 (1990-04-01), Schmidt
patent: 5485858 (1996-01-01), Schmidt
patent: 95038 (1983-11-01), None
patent: 11207278 (1999-08-01), None

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