Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Patent
1993-12-17
1996-04-09
Arola, Dave W.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
To produce composite, plural part or multilayered article
264279, 285 21A, 219535, 219544, B29C 3900
Patent
active
055058981
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a plastic pipe and a manufacturing method thereof. More specifically, the present invention relates to a plastic pipe used for electro-fusion coupling, and a manufacturing method thereof.
PRIOR ART
In the past, in order to couple two plastic pipes to each other by electro-fusion coupling, an electro-fusion fitting which is shown in FIG. 18 and formed by injection molding was utilized. The electro-fusion fitting 1 includes an approximately hollow cylinder-like body 2 made of synthetic resin, and an electric heating wire 3 which is wound in a form of a coil is embedded in the vicinity of an inner surface of the body 2, and both ends of the electric heating wire 3 are connected to terminals 4 being formed to be projected from the body 2. Then, in coupling, an outer periphery of each of ends of pipes 5 and 6 to be coupled to each other is scraped by a scraper or the like, and then, the ends are inserted into the body 2, and a heating electric power source (not shown) is connected to the terminals 4 to supply an electric power source to the electric heating wire 3.
In this prior art, since the electro-fusion fitting 1 is formed by injection molding, it was necessary to prepare a dedicated mold for each kind of elbows, tees, and etc., and therefore, there was a problem that a cost is high.
Furthermore, since the outer peripheries of the ends of the pipes 5 and 6 are scraped by the scraper or the like, there was a problem that a workability is poor.
In addition, since the pipes 5 and 6 are respectively inserted into both sockets of the body 2 such that the body 2 and the pipe 5, and the body 2 and the pipe 6 are fused and adhered to each other, respectively, a heat amount necessary for such the fusion coupling becomes large. Accordingly, there was another problem that it is necessary to use a heating electric power source having a larger capacity or to prolong a power supply time.
SUMMARY OF THE INVENTION
Therefore, a principal object of the present invention is to provide a plastic pipe by which a workability can be increased and it is possible to reduce a capacity of an electric power source or shorten a power supply time.
Another object of the present invention is a manufacturing method of a plastic pipe, in which a plastic pipe can be manufactured easily.
The present invention is a plastic pipe to which a member made of first synthetic resin is coupled, comprising: a pipe body made of second synthetic resin, the first and second synthetic resin having first and second fusion temperatures, respectively; a socket formed at an end of the pipe body and for receiving the member; and a heat generating unit provided on or in the vicinity of an inner surface of the socket.
The socket formed at the end of the pipe body is provided with the heat generating unit which includes an electric heating wire, for example. In coupling, an outer periphery of an end of a pipe or the like which is to be coupled to the plastic pipe is scraped by a scraper or the like, and then, the end of the pipe or the like is inserted to the socket. Thereafter, a heating electric power source is connected to terminals connected to both ends of the electric heating wire to supply an electric power to the electric heating wire. Then, the electric heating wire generates a heat due to an ohmic resistance component thereof, so that the inner surface of the socket and the outer periphery of the pipe are fused and adhered or coupled to each other. After a predetermined time elapses, the supply of the electric power to the electric heating wire is stopped, and a coupling portion is cooled.
As the above described heat generating unit provided on the inner surface of the socket or in the vicinity of the inner surface of the socket, a heat generating unit which includes a ferromagnetic alloy member having a Curie temperature equal to the first and second fusion temperatures or higher than the first and second fusion temperatures. In coupling a plastic pipe which is provided with the heat generating un
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Goto Yuichiro
Harada Takatomo
Kasa Hideki
Tago Takashi
Arola Dave W.
Kubota Corporation
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