| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a heat fusion joining method of a resin tube capable of connecting many small diameter branch pipes to a large diameter main pipe at a right angle. <P>SOLUTION: In the case of fusing and joining the small diameter branch pipes made of polybutene, polyethylene or polypropylene to the large diameter main pipe of the same material of which diameter is larger than the branch pipes at a right angle or obliquely by using the fusion joining method of the resin tube by this invention, an attaching hole is provided in the main pipe and an inlet peripheral of the attaching hole and an outer circumference of an insertion part of the branch pipe are heated and joined. The attaching hole consists of a first hole bored through to the inside of the main pipe and having a hole diameter fitted to an inner diameter of the branch pipes and a second hole having a hole diameter fitted to an outer diameter of the branch pipes. It is preferable to form a step part for locking the branch pipe between the first hole and the second hole. <P>COPYRIGHT: (C)2007,JPO&INPIT |
