Hybrid disk-cone extrusion die assembly
AssigneePechiney Emballage Flexible Europe
InventorsRandolph L. Davidson, Robert John Blemberg
Life of this patent
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Abstract
The present invention relates to an extrusion die assembly. Specifically, the present invention relates to an extrusion die assembly comprising a pair of extrusion dies wherein one extrusion die is disposed within the second extrusion die. The extrusion dies may comprise a plurality of extrusion die modules wherein at least one of the extrusion die modules incorporates a flat compression deal with a conical or otherwise angled spillover surface. Further, the present invention relates to a method for utilizing an extrusion die assembly comprising a pair of extrusion dies, each having at least one extrusion die module having a conical or otherwise angled spillover surface.
Claims20
An extrusion die assembly for extruding molten material having an upstream and a downstream end comprising:
- a first extrusion die comprising:
- a first extrusion die module comprising:
- a first mating portion comprising:
- a first planar seal surface defining a first plane;
- a first spillover surface disposed adjacent to said first planar seal surface and, at least in part, outside of said first plane;
- at least one first distribution channel extending from said first seal surface to said first spillover surface;
- and
- at least one first seal surface boundary having a first end point and a second end point, wherein said at least one first seal surface boundary intersects said at least one first distribution channel at said first and second end points along said first plane;
- and
- a second extrusion die disposed within said first extrusion die.
An extrusion die assembly far extruding molten material having an upstream and a downstream end comprising:
- a first extrusion die;
- and
- a second extrusion die disposed within said first extrusion die comprising:
- a first mating portion comprising:
- a first planar seal surface defining a first plane;
- a first spillover surface disposed adjacent to said first planar seal surface and, at least in part, outside of said first plane;
- at least one first distribution channel extending from said first seal surface to said first spillover surface;
- and
- at least one first seal surface boundary having a first end point and a second end point, wherein said at least one first seal surface boundary intersects said at least one first distribution channel at said first and second end points along said first plane.
A method of forming a film structure comprising the steps of:
- providing an extrusion die assembly having an upstream and a downstream end comprising:
- a first extrusion die;
- and
- a second extrusion die associated with said first extrusion die, wherein at least one of said first extrusion die and said second extrusion die further comprises:
- an extrusion die module comprising:
- a first mating portion comprising:
- a first planar seal surface defining a first plane;
- a first spillover surface disposed adjacent to said first planar seal surface and, at least in part, outside of said first plane;
- at least one first distribution channel extending from said first seal surface to said first spillover surface;
- and
- at least one first seal surface boundary having a first end point and a second end point, wherein said at least one first seal surface boundary intersects said at least one first distribution channel at said first and second end points along said first plane;
- and
- extruding at least a first melt material and a second melt material through said extrusion die assembly to form a multi-layer extrudate.
Dependencies are inferred from the claim text.