| 摘要 |
A device for improving the possibilities of process control in blown film manufacture is described. In blown film manufacture, the plastic material is extruded in the form of a tube from a slot die and is pulled off while maintaining an internal pressure in the tube as it cools during chemical formation of the film material. According to the invention, the film tube is flushed on all sides in this cooling area with an air stream that has been conditioned in terms of temperature and air purity, and this flushing air stream, in turn, is shielded against outside influence by a partition surrounding the area. Preferably, the flushing air stream is divided into a number of partial air streams.
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