Film blow head.

摘要

The present invention describes a film-blowing head (10) for producing multilayer plastic tubular films (34) with channel systems (22) for subdividing the melt streams of each layer to be extruded onto the circumference of a die-gap annular chamber (30). Film-blowing heads of this kind are used for the production of multilayer films, for example for use in the foodstuffs industry. In the case of film-blowing heads of this kind, in order to be able to achieve an individual thermal treatment of the individual melt streams, it is proposed that the pipe-channel systems for the melt streams be arranged in cylindrical shells (24) in each case which are separate from one another and concentric to one another, the individual cylindrical shells being separated from one another by a thermal separating layer (26).