Plastic pipe and manufacturing method thereof
AssigneeKubota Corporation
InventorsYuichiro Goto, Takatomo Harada, Hideki Kasa, Takashi Tago
Life of this patent
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Abstract
A plastic pipe (10) includes a pipe body (12), and, at an end of the pipe body (12), there is formed a socket which is provided in the inner surface or in the vicinity of the inner surface thereof with a heat generating unit (18). In coupling, an outer peripheral surface of an end of a pipe (28) to be coupled is scraped by a scraper or the like, and the end is inserted into the socket. Then, an electric current is supplied to the heat generating unit (18) such that a heat is generated by the same. Then, synthetic resin of the coupling surfaces of the pipe (28) and the socket and synthetic resin disposed thereabout are fused, so that the both members are fusion-coupled to each other.
Claims4
A method of manufacturing a plastic pipe, comprising the following steps:
- (a) preparing a pipe formed of a synthetic resin;
- (b) preparing a heat generating unit;
- (c) mounting the heat generating unit on a core mold;
- (d) heating and softening an end of the pipe;
- (e) forming a socket at the end of the pipe and incorporating the heat generating unit in the socket by pressure-inserting the core mold into the end of the pipe, said heat generating unit being formed integrally into said socket;
- and
- (f) releasing the pipe from the core mold.
A manufacturing method of a plastic pipe, comprising the following steps:
- (a) preparing a pipe formed of a synthetic resin;
- (b) preparing a heat generating unit;
- (c) preparing a first core mold for defining an inner surface of the pipe and a second core mold for defining an inner surface of a socket to be formed on the pipe;
- (d) inserting the first and second core molds into the pipe and the heat generating unit;
- (e) forming a cavity around the pipe and the heat generating unit by closing an outer mold;
- (f) forming the socket to be integrated with the pipe and the heat generating unit by injecting synthetic resin into the cavity;
- and
- (g) releasing the pipe from the first and second core molds by opening the outer mold.
Dependencies are inferred from the claim text.