Sekisui Chemical Co., Ltd.

Hiroaki Kondou

Kouzou Makino

Ayaka Kitagawa

Tsuyoshi Katou

Amiko Sakamoto

An electrofusion joint includes a tubular main body, a stopper portion, a first heat generation section, and a second heat generation section. The tubular main body includes a joint receiving portion. The stopper portion projects inwardly on an inner surface of the tubular main body. The first heat generation section includes a first heater wire wound and arranged at the joint receiving portion. The second heat generation section includes a second heater wire wound so that wound parts of the second heater wire are adjacent to each other and the second heater wire is in the stopper portion. The first heat generation section includes at least one heat generation portion in which the first heater wire is wound so that wound parts of the first heater wire are adjacent to each other.

Electrofusion joint and fusion method

An electrofusion joint includes a main body and a heating wire. The main body is configured to be connected to a resin pipe containing a thermoplastic resin. The heating wire is in the main body. The heating wire includes a conducting wire and an insulating cover film that is around the conducting wire. The insulating cover film has a melting point of at least 230 degrees.

Electrofusion joint

Provided is a leakage detector which is capable of exhibiting high sensitivity to vibration-sounds caused by water leakage from a synthetic resin pipe and thus setting an installation span longer to thereby make it possible to more efficiently perform a water leakage inspection for a synthetic resin pipe. The leakage detector () comprises a base (), a piezoelectric element () supported by the base () and configured to convert vibration-sounds to an electric signal, and a weight member () loaded against the piezoelectric element (). The piezoelectric element () is made of a polymeric piezoelectric material. One end of the piezoelectric element () is supported by an upper end of a support post (), and the weight member () is loaded against the other end of the piezoelectric element ().

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Kyoto, Japan

Hiroaki Kondou