Method for closing openings of through-holes in a pipe wall

Details Method for closing openings of through-holes in a pipe wall Method for closing openings of through-holes in a pipe wall

1988-02-18

1989-11-14

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264322, 425DIG218, 4251748R, B29C 5700, B29C 5704

Patent

active

048805793

ABSTRACT:
A method for closing the opening of each of the through-holes in the pipe-wall of a resin pipe and which extend parallel to the axis of the pipe, the method comprises pressing one end portion of the pipe in the direction parallel to the axis in a mold for closing the opening, the mold being connected to a high frequency current source, and heating the end portion by applying a high frequency current to the mold so as to melt the hole-partition walls which partition the through-holes, and the inner surface of the through-holes, thereby closing the opening.

REFERENCES:
patent: 4140461 (1979-02-01), Wiley et al.
patent: 4338716 (1982-07-01), Marissen et al.
patent: 4390383 (1983-06-01), van Dongeren

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