Back to results
US 11,654,605 B2Granted
Die head and process to manufacture multilayer tubular film
AssigneeHosokawa Alpine Aktiengesellschaft
InventorsChristian Baier, Felix Grimm, Michael Heinecker, Joachim Libowski
Life of this patent
Estimating the term…
Abstract
In the case of a die head and a process to produce multilayer tubular film made from thermoplastic polymers, the advantages of radial distributors and axial distributors should be combined. This is achieved in that at least one distributor is a plate distributor and at least one distributor is an axial distributor, whereby the plate distributor is located in an annular element of the axial distributor upstream of the melt merge zone to the ring-shaped die.
Claims16
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.
4 more elements
Dependencies are inferred from the claim text.