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...http://www.google.es/patents/US4282905?utm_source=gb-gplus-sharePatente US4282905 - Manufacture of seamless laminated tubing
