Method and apparatus for forming an extrusion
AssigneePlastech Multiseals Limited
InventorsRichard S. Whelan, Robert G. Whelan
Life of this patent
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Abstract
A method of forming an extrusion comprises passing a first, plastics material (12) through a first channel (104) in a die, passing a second, plastics material (14) through a second channel (112) in the die, and passing a third, plastics material (16) through a third channel (314) in the die. At least one of the materials is passed through a metering gap into contact with the other other materials to cause the at least one material to bond with the other materials as the materials pass through the die.
Claims23
A method of forming an extrusion comprising:
- passing a first, plastics material (12) through a first channel (104) in a die;
- passing a second, plastics material (14) through a second channel (112) in said die;
- and passing a third, plastics material (16) through a third channel (314) in said die;
- wherein each said plastics material is introduced into said die in a flowable state and at least one of said materials is passed through a metering gap means into contact with at least one of the other of said materials to cause said at least one material to bond with said at least one of said other of said materials as said materials pass through the die.
A method as claimed in any of the preceding claims wherein each of the three plastics materials is introduced into the die in a heat softened flowable state.
A method as claimed in any of the preceding claims wherein the second material is applied as a coating to at least a portion of said first and third materials as said first and third materials pass through the die.
A method as claimed in any of the preceding claims wherein the third material forms a rigid or partially rigid strip in said extrusion.
A method as claimed in any of the preceding claims wherein the third material forms a rigid or partially rigid strip bonded to said first material.
A method as claimed in any of the preceding claims wherein each of said second and third materials is passed through a respective metering gap means into contact with at least one of the other of said materials to cause each said second and third material to bond with said at least one of said other of said materials as said materials pass through the die.
A die for forming an extruded profile, the die comprising:
- a first channel through said die for passing a first plastics material therethrough;
- a second channel for receiving a second plastics material in a flowable state;
- a third channel for receiving a third plastics material in a flowable state;
- and a first metering gap means for metering said second plastics material to bring said second plastics material into contact with at least one of said first and third plastics materials so as to bond therewith.
An apparatus for forming an extrusion comprising:
- means for directing first, second and third heat softened flowable plastics material continuously into a die;
- and wherein the die comprises:
- a first channel means for receiving said first plastics material in a flowable state;
- a second resin channel means for receiving said second plastics material in a flowable state;
- and a third resin channel means for receiving said third plastics material in a flowable state;
- and a metering gap means for directing said second material into contact with said first and third materials to cause said second material to bond with said first and third materials as said first and third materials pass through the die.
Dependencies are inferred from the claim text.