DIE PIN HAVING CERAMIC TIP FOR MOLTEN PLASTIC EXTRUSION
First Claim
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1. A die pin for forming a hollow plastic parison, the die pin comprising:
- a base member having a proximal mounting portion, a body portion, and a distal frustoconical portion, wherein the base member comprises a first material; and
a tip member mounted on the distal frustoconical portion, wherein the tip member comprises a second material, the second material being different than the first material.
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Abstract
A die pin for forming a hollow plastic parison is provided, the die pin having a base member with a proximal mounting portion, a body portion, and a distal frustoconical portion, wherein the base member comprises a first material, and a tip member mounted on the distal frustoconical portion, wherein the tip member comprises a second material, the second material being different than the first material. An extrusion apparatus and method for forming a hollow plastic parison using the die pin are also provided.
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17 Claims
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1. A die pin for forming a hollow plastic parison, the die pin comprising:
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a base member having a proximal mounting portion, a body portion, and a distal frustoconical portion, wherein the base member comprises a first material; and a tip member mounted on the distal frustoconical portion, wherein the tip member comprises a second material, the second material being different than the first material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An extrusion apparatus for forming a hollow plastic parison, the extrusion apparatus comprising:
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a die ring having an inner surface defining an extrusion opening with a central axis; a die pin disposed within the extrusion opening and aligned with the central axis, the die pin comprising; a base member having a proximal mounting portion, a body portion, and a distal frustoconical portion, wherein the base member comprises a first material; and a tip member mounted on the distal frustoconical portion, wherein the tip member comprises a second material, the second material being different than the first material, and wherein the tip member comprises a base circumference that is less than a circumference of the extrusion opening, wherein an annular space is defined between an outer surface of the die pin and the inner surface of the die ring. - View Dependent Claims (12, 13, 14)
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15. A method for forming a hollow plastic parison, the method comprising:
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disposing a die pin within an extrusion opening defined by an inner surface of a die ring, the die pin being aligned with a central axis of the extrusion opening, the die pin comprising; a base member having a proximal mounting portion, a body portion, and a distal frustoconical portion, wherein the base member comprises a first material; and a tip member mounted on the distal frustoconical portion, wherein the tip member comprises a second material, the second material being different than the first material, and wherein the tip member comprises a base circumference that is less than a circumference of the extrusion opening, wherein an annular space is defined between an outer surface of the die pin and the inner surface of the die ring; and directing molten plastic through the annular space between the die ring and the die pin to form the hollow plastic parison without accumulation of the molten plastic on the die ring. - View Dependent Claims (16, 17)
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Specification