Overturning device for overturning molten material and purging method
AssigneeWindmoller & Holscher
InventorsMartin Backmann, Hermann-Josef Jäckering, Markus Bussmann, Bernd Liesbrock, Karsten Golubski
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Abstract
The present invention relates to an overturning device (10) for overturning a molten material (200) in a melt channel (110) comprising a melt inlet (20) and a melt outlet (30) wherein between the melt inlet (20) and the melt outlet (30) at least one melt guidance means (40) is assembled for a rearrangement of the molten material (200) from the center (22) of the melt inlet (20) to the edge (34) of the melt outlet (30) and for rearrangement of the molten material (200) from the edge (24) of the melt inlet (20) into the center (32) of the melt outlet (30).
Claims16
An overturning device for overturning a molten material in a melt channel comprising a melt inlet and a melt outlet, wherein between the melt inlet and the melt outlet at least one melt guidance means is assembled for a rearrangement of the molten material from the center of the melt inlet to the edge of the melt outlet and for a rearrangement of the molten material from the edge of the melt inlet into the center of the melt outlet, wherein the at least one melt guidance means comprises a first guidance channel with a guidance opening in the center of the melt inlet and at least one guidance outlet at the edge of the melt outlet, and wherein the at least one melt guidance means comprises a second guidance channel with a guidance outlet at the center of the melt outlet and at least a guidance opening at the edge of the melt inlet, wherein the first guidance channel and the second guidance channel comprise within the course a deflection section with a setting angle towards the flow direction of the molten material in at least one melt guidance means of less than 90°, wherein the guidance opening of the second guidance channel is fluid communicating connected with a ring collector which is assembled mainly at the entire perimeter of the melt inlet wherein the guidance opening and the guidance outlet comprise a completely enclosing geometry.
A blow head for performing a blow head extrusion method comprising at least one melt channel for the conveyance of molten material to a blow outlet of the blow head,
- wherein
- in the at least one melt channel at least one overturning device for overturning a molten material in a melt channel comprising a melt inlet and a melt outlet, wherein between the melt inlet and the melt outlet at least one melt guidance means is assembled for a rearrangement of the molten material from the center of the melt inlet to the edge of the melt outlet and for a rearrangement of the molten material from the edge of the melt inlet into the center of the melt outlet, is assembled, wherein the at least one melt guidance means comprises a first guidance channel with a guidance opening in the center of the melt inlet and at least one guidance outlet at the edge of the melt outlet, and wherein the at least one melt guidance means comprises a second guidance channel with a guidance outlet at the center of the melt outlet and at least a guidance opening at the edge of the melt inlet, wherein the first guidance channel and the second guidance channel comprise within the course a deflection section with a setting angle towards the flow direction of the molten material in at least one melt guidance means of less than 90°, wherein the guidance opening of the second guidance channel is fluid communicating connected with a ring collector which is assembled mainly at the entire perimeter of the melt inlet, wherein the guidance opening and the guidance outlet comprise a completely enclosing geometry.
A method for the performance of a purge process in an extrusion device, comprising the following steps:
- introducing a molten material in a melt inlet in an overturning device for overturning a molten material in a melt channel comprising a melt inlet and a melt outlet, wherein between the melt inlet and the melt outlet at least one melt guidance means is assembled for a rearrangement of the molten material from the center of the melt inlet to the edge of the melt outlet and for a rearrangement of the molten material from the edge of the melt inlet into the center of the melt outlet is assembled, wherein the at least one melt guidance means comprises a first guidance channel with a guidance opening in the center of the melt inlet and at least one guidance outlet at the edge of the melt outlet, and wherein the at least one melt guidance means comprises a second guidance channel with a guidance outlet at the center of the melt outlet and at least a guidance opening at the edge of the melt inlet, wherein the first guidance channel and the second guidance channel comprise within the course a deflection section with a setting angle towards the flow direction of the molten material in at least one melt guidance means of less than 90°, wherein the guidance opening of the second guidance channel is fluid communicating connected with a ring collector which is assembled mainly at the entire perimeter of the melt inlet, wherein the guidance opening and the guidance outlet comprise a completely enclosing geometry;
- rearrangement of molten material from the center of the melt inlet to the edge of a melt outlet of the overturning device and
- rearrangement of molten material from the edge of the melt inlet into the center of the melt outlet.
Dependencies are inferred from the claim text.