Composite tubing method of manufacture

Claim 1

IN A METHOD OF PRODUCING A HIGH STENGTH COMPOSITE TUBING PRODUCT HAVING GOOD FLEXIBILITY AND CRIMP RESISTANCE CHARACTERISTICS, AND WHEREIN THE TUBING COMPRISES A RELATIVELY THIN-WALLED INNER TUBE OF ELASTOMERIC POLYURETHANE MATERIAL, AT LEAST ONE LAYER OF FIBROUS MATERIAL DISPOSED ABOUT SAID INNER TUBE AND FORMING A REINFORCING MEMBER, AN ELASTOMERIC POLYURETHANE ADHESIVE BONDING SAID REINFORCING MEMBER TO SAID INNER TUBE, AND AN OUTER SHEATH OF ELASTOMERIC POLYURETHANE MATERIAL COVERING SAID REINFORCING MEMBER AND BEINGBONDED TO THE LATTER AND SAID INNER TUBE BY SAID ADHESIVE MATERIAL, THE STEPS INCLUDING EXTRUDING THE INNER TUBE OF ELASTOMERIC POLYURETHANE MATERIAL, APPLYING A LIQUID LAYER OF SAID ELASTOMERIC POLYURETHANE ADHESIVE AT A VISCOSITY OF BETWEEN ABOUT 1000 TO 100,000 CENTIPOISES AND AT A TEMPERATURE BETWEEN ABOUT 70* F. UP TO 225* F. TO SAID INNER TUBE, HEATING THE ADHESIVE COATED INNER TUBE AT A TEMPERATURE BETWEEN ABOUT 125*F. TO 250*F. FOR A TIME SUFFICIENT TO GIVE SAID ADHESIVE A GELLED CONDITION, APPLYING SAID REINFORCING MEMBER TO THE ADHESIVE COATED INNER TUBE WHILE SUBSTANTIALLY IN THE SAID GELLED CONDITION SO AS TO INCAPSULATE SAID REINFORCING MEMBER WITHOUT SUBSTANTIAL PENETRATION OF THE FIBERS TO PERMIT RELATIVE MOVEMENT THEREOF, AND THEN EXTRUDING SAID OUTER SHEATH OVER THE ADHESIVE INCAPSULATED REINFORCING MEMBER PRIOR TO COMPLETE SETTING OF SAID ADHESIVE, AND WHILE THE LATTER IS SUBSTANTIALLY IN SAID GELLED CONDITION.