Method for extrusion of multi-layer coated elongate member
First Claim
1. A method of making a multi-layer coated elongate member comprising:
- providing an elongate member;
thereaftertube extruding a compound comprising a first thermoplastic material onto an outer surface of the elongate member to create a first layer having a thickness less than about 0.064 mm (0.0025 inch) using a first extruder apparatus; and
thereafterpressure extruding a compound comprising a second thermoplastic material different from the first thermoplastic material onto an outer surface of the first layer to create a second layer adjacent the first layer using a second extruder apparatus,the second layer fully wetting the first layer, and the flow point of the first thermoplastic material being at least 30°
C. greater than the extrusion melt temperature of the second thermoplastic material.
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Abstract
A method of making a multi-layer insulated elongate member is disclosed. The method includes providing an elongate member and tube extruding a first thermoplastic material onto an outer surface of the elongate member to create a first layer having a thickness less than or equal to 0.064 mm (0.0025 inch) using a first extruder apparatus. The method further includes using a second extruder apparatus for pressure extruding a compound comprising a second thermoplastic material different from the first thermoplastic material onto an outer surface of the first layer to create a second layer. The second layer fully wets the first layer and the flow point of the first thermoplastic material is at least 30° C. greater than the extrusion melt temperature of the second thermoplastic material.
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Citations
20 Claims
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1. A method of making a multi-layer coated elongate member comprising:
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providing an elongate member;
thereaftertube extruding a compound comprising a first thermoplastic material onto an outer surface of the elongate member to create a first layer having a thickness less than about 0.064 mm (0.0025 inch) using a first extruder apparatus; and
thereafterpressure extruding a compound comprising a second thermoplastic material different from the first thermoplastic material onto an outer surface of the first layer to create a second layer adjacent the first layer using a second extruder apparatus, the second layer fully wetting the first layer, and the flow point of the first thermoplastic material being at least 30°
C. greater than the extrusion melt temperature of the second thermoplastic material.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of making a multi-layer coated elongate member comprising:
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providing a tube extruder apparatus having a tube extruder die and a tube extruder guider tip positioned within the tube extruder die; providing a pressure extruder apparatus having a pressure extruder die and a pressure extruder guider tip positioned within the pressure extruder die, the pressure extruder guider tip defining a pressure extruder guider tip opening; drawing an elongate member through the tube extruder guider tip to tube extrude a first insulating layer of a first thermoplastic material onto an outer surface of the elongate member to a first insulating layer thickness of less than or equal to 0.051 mm (0.002 inch); drawing the elongate member through the pressure extruder guider tip of the pressure extruder die to pressure extrude a second insulating layer of a second thermoplastic material different from the first thermoplastic material onto an outer surface of the first insulating layer to a second insulating layer thickness of less than or equal to 0.038 mm (0.0015 inch); and extruding a third insulating layer of a third thermoplastic material onto an outer surface of the second insulating layer; wherein the second insulating layer fully wets the first insulating layer, wherein the flow point of the first thermoplastic material is at least 30°
C. greater than the extrusion melt temperature of the second thermoplastic material, andwherein the tensile modulus of the first thermoplastic material is greater than 1241 MPa (180,000 psi) at 25°
C. and the tensile modulus of the second thermoplastic material is greater than 1379 MPa (200,000 psi) at 25°
C. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification