PURPOSE: To provide a tube fitting, which can be fusion-bonded with proper electric power without using a large injection moulding machine and a controller, etc., by injecting thermoplastic molten plastic material to a space between respective connecting members after attaching a pair of the connecting members in a metal mold so as to be both ends of the tube fitting. ;CONSTITUTION: A pair of connecting members 10 and 11 are provided so as to have the internal diameter, into which a pair of plastic tubes to be connected to the connecting members 10 and 11 can be inserted, and in addition, an electric heating wire 12 is buried in the respective internal peripheries. Furthermore, respective connector pins 13 and 14 are buried in both ends of the respective connecting members 10 and 11 so as to project outwards, and in addition, both ends of the electric heating wire 12 are connected to the connector pins 13 and 14. Furthermore, the respective connecting members 10 and 11 are set in a metal mold 2 by attaching them on the ends of respective mandrels 21 and 22 so as to be both ends of the tube fitting. Then, thermoplastic molten plastic material is injected to a space between the respective connecting members 10 and 11 through a runner 23. Thus, the space between the metal mold 2 and the respective mandrels 21, 22 is filled with molten resin, and an intermediate member is formed. At the same time, the respective connecting members 10 and 11 are fusion-bonded by heat.;COPYRIGHT: (C)1993,JPO&Japio
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