Extrusion die membrane
AssigneeExtrusion Dies, Inc.
InventorJohn A. Ulcej
Life of this patent
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Abstract
A flexible membrane is attached to a holder for controlling flow in an extrusion die. The membrane includes a horizontal portion, first and second curved portions adjacent the horizontal portion, first and second offset portions adjacent the first and second curved portions, and first and second edges adjacent the first and second offset portions. The membrane is formed of a single piece of material. The flow control device including the flexible membrane may be produced by fabricating a membrane holder from a material, fabricating a flexible membrane from the same material, joining the flexible membrane to the membrane holder, and hardening the membrane holder and membrane.
Claims13
An extrusion die including a discharge opening and a membrane disposed upstream of and spaced from the discharge opening, the membrane comprising:
- a horizontal portion;
- first and second curved portions adjacent the horizontal portion;
- a first offset portion adjacent the first curved portion;
- a second offset portion adjacent the second curved portion;
- a first edge adjacent the first offset portion, opposite the first curved portion;
- and
- a second edge adjacent the second offset portion, opposite the second curved portion;
- wherein the membrane is formed of a single piece of material and wherein the first and second offset portions are inclined to allow an extrusion material to enter and exit an extrusion die channel in a substantially coplanar fashion.
Dependencies are inferred from the claim text.