05-09-2013 дата публикации
Номер: US20130230614A1
A film blowing head () for the production of film tubing from a single or multi-layer film, 11. A film blowing head () for the production of a film tubing from a single or multi-layer film ,{'b': 1', '4', '4', '5', '6, 'which () comprises at least one extrusion gap () to form a film layer, which () is embodied between to boundary walls (, ),'}{'b': 22', '4, 'with at least one melt pipeline () mouthing into the extrusion gap (),'}{'b': 4', '4, 'which converts inside the extrusion gap () into a first melt channel (),'}{'b': 11', '12', '13', '14', '10', '3', '7', '5', '6', '4, 'which is formed in at least one section (, , ,) of the progression of at least one first melt channel () by recesses (, ) in the two boundary walls (, ) of the extrusion gap (),'}{'b': 4', '10', '10', '14', '4, 'and which distributes the melt in the extrusion gap (), while it () tapers in its progression in the direction of transportation of the melt (h), and finally in its () end section () converts entirely into the extrusion gap (),'}{'b': 10', '11', '12', '13', '14', '3', '7', '5', '6, 'in which at least one first melt channel () is formed in one of its sections (, , , ) only by recesses (, ) in one of its two boundary walls (, ),'}{'b': 24', '25', '3', '7, 'with the axes of symmetry (, ) of both recesses (, ) being aligned with each other at least up to a boundary line, characterized in that'}{'b': 10', '3', '7', '5', '6, 'the section of the first melt channel (), which is only formed by recesses (, ) in one of its two boundary walls (, ), represents at least the last overflow section.'}21123756111213141010. A film blowing head () according to claim 1 , characterized in that the depth (T claim 1 , T) of the recesses ( claim 1 , ) increases at least in one of the two boundary walls ( claim 1 , ) in at least one section ( claim 1 , claim 1 , claim 1 , ) of at least one first melt channel () in the direction of transportation of the melt of this melt channel ().31. A film blowing head () ...
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