Manufacture of seamless laminated tubing

Abstract

Tubing of a thermoplastic polymer for handling corrosive materials is laminated or reinforced by covering the same with a heat-softenable bonding agent as an adhesive, inserting the adhesive-covered tube in a cylindrical glass fabric sleeve, inserting the assembly in a hollow cylinder, heating the tube to a temperature to cause the softening of the bonding agent and adhesion to the tube, forcing the tube with air or centrifugal force against the inside of the cylinder to force softened bonding agent into the interstices of the glass fabric, and cooling the entire assembly while expanded to adhere the bonding agent to the fabric and thereby form a unitary structure. The reinforced tube can be bonded to the inside of a preformed steel or fiberglass-reinforced plastic pipe to serve as a protective liner therefor.

Dependencies are inferred from the claim text.