Extrusion die element, extrusion die and method for making multiple stripe extrudate
Assignee3M Innovative Properties Company
InventorsRonald W. Ausen, William J. Kopecky
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Abstract
Extrusion die (30) comprising a plurality of shims (40a, 40b, 40c) positioned adjacent to one another, the shims (40a, 40b, 40c) together defining a first cavity, a second cavity, and a die slot, and methods of using the same. A variety of composite layers can be made from various dies described herein.
Claims11
An extrusion die comprising a plurality of shims positioned adjacent to one another, the shims together defining a first cavity, a second cavity, and an die slot, wherein the die slot has a single distal opening, wherein each of the plurality of shims defines a portion of the single distal opening, wherein at least a first one of the shims provides a passageway between the first cavity and the die slot, wherein at least a second one of the shims provides a passageway between the second cavity and the die slot, and wherein at least one of the shims is a spacer shim providing no conduit between either the first or the second cavity and the die slot, and wherein the shims that provide a conduit between the second cavity and the die slot have a narrowed passage displaced from both edges of the distal opening.
An extrusion die comprising a plurality of shims positioned adjacent to one another, the shims together defining a first cavity, a second cavity, and an die slot, wherein the die slot has a distal opening, wherein each of the plurality of shims defines a portion of the distal opening, wherein at least a first one of the shims provides a passageway between the first cavity and the die slot, wherein at least a second one of the shims provides a passageway between the second cavity and the die slot, wherein the shims provide a passageway between the second cavity and the die slot have first and second opposed major surfaces, wherein said passageway extends from the first major surface to the second major surface, wherein the plurality of shims comprises a plurality of a repeating sequence shims comprising a shim that provides a conduit between the first cavity and the die slot, a spacer shim, a shim that provides a conduit between the second cavity and the die slot, and a spacer shim, wherein the shims that provide a conduit between the second cavity and the die slot have a narrowed passage displaced from both edges of the distal opening.
Dependencies are inferred from the claim text.