Extrusion device and method for manufacturing an article having a cavity
AssigneeCollin Lab & Pilot Solutions GmbH
InventorFriedrich KASTNER
Life of this patent
Estimating the term…
Abstract
An extrusion device for producing an object having a cavity, in particular a tube or a container, includes a material feed that opens into an extrusion nozzle, and a support gas feed that opens into a blow-in opening for introducing support gas into the interior of the resulting object, wherein the support gas feed has at least one valve for regulating the support gas, characterized in that at least one valve for regulating the support gas is a proportional valve which can be regulated by a controller.
Claims20
An extrusion device, in particular a blown film extrusion device, for producing an object having a cavity, in particular a tube, a blown film or a container, comprising
- a material feed that opens into an extrusion nozzle, and
- a support gas feed that opens into a blow-in opening for introducing support gas into the interior of the resulting object,
- wherein the support gas feed has at least one valve for regulating the support gas, and
- wherein the at least one valve for regulating the support gas is a proportional valve which can be regulated by controller, wherein the proportional valve has a non-linear gas flow characteristic in at least one operating range and the control circuit has a feedforward control superimposed on the controller.
(canceled)
A method for producing an object having a cavity, by means of an extrusion device, in particular a blown film extrusion device, wherein material is fed to an extrusion nozzle via a material feed and support gas is introduced into the interior of the resulting object via a blow-in opening by means of a support gas feed,
- wherein the support gas feed has at least one valve for regulating the support gas,
- wherein the at least one valve for regulating the support gas feed-is a proportional valve which can be regulated by a controller.
Dependencies are inferred from the claim text.