Patent ID: 9114578
Filing Date: 2015-08-25
Classification: B29C,B29D,B29L

Abstract:
1. A film blowing head for producing a film tubing from a single or multi-laver film, comprising: at least one extrusion gap to form a film layer, said at least one extrusion gap being embodied between two boundary walls, with at least one melt pipeline mouthing into the at least one extrusion gap, said at least one melt pipeline converting inside the at least one extrusion gap into a first melt channel, which is formed in at least one section of a progression of at least one of the first melt channel by recesses in the two boundary walls of the a least one extrusion gap, and distributing a melt in the at least one extrusion gap, the first melt channel tapering in the progression in a direction of transportation of the melt (h), and in an end section of the first melt channel converting entirely into the at least one extrusion gap, in which the first melt channel is configured in one of the sections only by recesses in one of the two boundary walls, with axes of symmetry of both recesses in the two boundary walls being aligned with each other at least up to a boundary line, the section of the first melt channel, which is only formed by the recesses in one of the two boundary walls, representing at least a last overflow section, and the at least one extrusion gap being a circular cylindrical extrusion gap.