To easily mold an inserting mouth projected part to the inserting mouth leading end part of a plastic pipe even with respect to a long pipe.
A mold 10 for molding a pipe inserting mouth part wherein an inserting mouth projection molding space S only the outer surface of which is stepwise increased in diameter radially and outwardly is formed to the deep end of the annular groove receiving a plastic pipe end 11 is prepared and the inner core 20 for the plastic pipe is fitted to the inner surface of the annular groove of the mold 10 and only the deep end of the annular groove of the mold 10 for molding the pipe inserting mouth part is heated to the softening temp. of the plastic pipe 11 and the plastic pipe 11 is axially pushed in the annular groove and the space for molding the inserting mouth projected part is filled with the heated and softened end part of the plastic pipe.
AKAISHI YORINOBU
YAMADA YOSHIKI