US 11,654,605 B2
Die head and process to manufacture multilayer tubular film
Christian Baier, Neusäß (DE); Felix Grimm, Augsburg (DE); Michael Heinecker, Augsburg (DE); and Joachim Libowski, Neusäß (DE)
Assigned to HOSOKAWA ALPINE Aktiengesellschaft, Augsburg (DE)
Filed by HOSOKAWA ALPINE Aktiengesellschaft, Augsburg (DE)
Filed on Oct. 11, 2019, as Appl. No. 16/600,260.
Claims priority of application No. 10 2018 008 127.4 (DE), filed on Oct. 13, 2018.
Prior Publication US 2020/0114564 A1, Apr. 16, 2020
Int. Cl. B29C 48/335 (2019.01); B29C 48/70 (2019.01); B29C 48/30 (2019.01); B29C 48/025 (2019.01)
CPC B29C 48/338 (2019.02) [B29C 48/70 (2019.02); B29C 48/0255 (2019.02); B29C 48/3001 (2019.02)] 16 Claims
OG exemplary drawing
 
1. A die head for producing a multilayer tubular film from thermoplastic polymers, the die head comprising:
a mandrel surrounded by a plurality of annular elements;
at least one melt feeder;
a plurality of melt channels arranged concentrically around a central axis of the die head, wherein the plurality of melt channels are delimited by the mandrel and the plurality of annular elements;
a ring-shaped die into which the plurality of melt channels discharge; and
a plurality of distributors for distributing a melt from the at least one melt feeder to the ring-shaped die;
wherein at least one of the plurality of distributors is an axial distributor and at least one of the plurality of distributors is a plate distributor, the plate distributor having a plurality of distributor plates with plate distributor melt channels located in between and arranged in an annular element of the plurality of annular elements upstream of where the melt merges into the ring-shaped die and whereby the plate distributor is delimited in a radial direction on a first side by a respective melt channel to which the plate distributor discharges and on a second opposite side by the annular element of the plurality of annular elements.