Method of molding socket of plastic resin tube

Details Method of molding socket of plastic resin tube Method of molding socket of plastic resin tube

B - Operations, Transporting

29

C

18/938

B29C 57/04 (2006.01) B29C 57/00 (2006.01)

Patent

CA 1094768

ABSTRACT OF THE DISCLOSURE A socket is molded at the edge of a plastic resin tube with a male mold and a female mold wherein the male mold comprises a large diameter part, a tapered part and a small diameter part and the female mold comprises a barrel surrounding the male mold small diameter part with a gap larger than the thickness of the resin tube and a stopper for closing the opening of the annular space formed between the male mold small diameter part and the barrel. In the operation, the edge of the resin tube is heated to soften it and it is outwardly fitted on the male mold small diameter part and the stopper is contacted at the boundary part between the male mold small diameter part and the tapered part or on the small diameter part near the boundary and the barrel is connected to the stopper of divided structure to dispose it about the outer part of the male mold small diameter part, and the resin tube is pushed to the direction of the male mold large diameter part to fill the edge of the resin tube in the annular space formed by the male mold small diameter part, the barrel and the stopper so as to increase the thickness and the barrel connected with the stopper in divided structure are radially opened and the resin tube is pushed to the direction of the large diameter part so as to outwardly fit the edge of the resin tube having the increased thickness part on the male mold large diameter part. In the other embodiment, the barrel is a unitary structure and is contacted with the stopper of divided structure. In this case, after increasing the thickness of the resin tube, the stopper is removed from the male mold by radially opening and the barrel is removed in the direction of the male mold large diameter part.

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