EXTRUDABLE TUBING AND SOLVENT BONDED FITTING FOR DELIVERY OF MEDICINAL FLUIDS

摘要

Assembly, and method of fabricating an assembly including an extruded polymeric tube and a prefabricated tubular polymer body (fitment), the method including the steps of: extruding an outer tubular surface of a thermoplastic propylene-based elastomer (PBE) material; treating the outer surface along a selected axial length at one end of the tube with a solvent; inserting the treated one end into a hollow tubular passage of a prefabricated tubular body having an inner passage wall of a polypropylene-based material; and allowing the mated juncture to dry such that the treated outer surface solvent bonds to the inner wall. The tubing is preferably a coextruded tube having an innermost layer of a thermoplastic ethylene-based olefinic material. The mating tubing and fitment overcome the prior art problems of stress cracking, fluid contamination and/or processing difficulties.

主权项

1. A method of coaxially bonding a polymeric tube to a prefabricated tubular body, the prefabricated tubular body defining a hollow central tubular passage having a longitudinal axis bounded by an inner wall of polypropylene based material, the method comprising:
extruding a mating polymeric tube having an outer tubular wall surface comprising thermoplastic propylene-based elastomer (PBE) material, and a central tubular passage having a longitudinal axis and opposing ends, treating the outer surface of the mating tube along a selected axial length at one of the end of the tube with a solvent that causes the treated outer surface to adhere to the inner wall of the tubular body on drying, inserting the treated end of the mating tube coaxially into the central tubular passage of the tubular body such that the outer surface of the treated end mates with the inner wall of the tubular body along the selected axial length to form a mated juncture, allowing the mated juncture to dry such that the treated outer surface solvent bonds to the inner wall.