Biaxial orientation blow molding method and preform holding jig

Details Biaxial orientation blow molding method and preform holding jig Biaxial orientation blow molding method and preform holding jig

B - Operations, Transporting

29

C

B29C 49/08 (2006.01) B29C 49/48 (2006.01) B29C 49/58 (2006.01) B29C 49/76 (2006.01) B29C 49/06 (2006.01) B29C 49/42 (2006.01)

Patent

CA 2166202

The present invention is intended to prevent the deformation of a cylindrical mouth portion of a preform when a blow pressure acts thereon in a diameter expanding direction during biaxial orientation blow molding. During biaxial orientation blow molding, sealing of the blow pressure is accomplished by means of a neck ring P1 circumferentially provided on a lower end of the circumferentially provided on a lower end of the circumferential surface of a cylindrical mouth portion P2 of a preform to thereby make the blow pressure act uniformly on the whole area of the cylindrical mouth portion P2, whereby the unreasonable deformation of the cylindrical mouth portion P2 due to the ununiform application of blow pressure thereto can totally be eliminated.

L'invention est destinée à empêcher la déformation d'une partie d'embouchure cylindrique d'une préforme lorsqu'une pression de soufflage agit sur celle-ci dans une direction d'élargissement de diamètre pendant le moulage par soufflage à orientation biaxiale. Pendant le moulage par soufflage à orientation biaxiale, la pression de soufflage est maintenue hermétique au moyen d'une bague de striction (P1) ménagée circonférentiellement sur une extrémité inférieure de la surface circonférentielle d'une partie d'embouchure cylindrique (P2) d'une préforme, afin de faire agir la pression de soufflage uniformément sur la totalité de la surface de la partie d'embouchure cylindrique (P2), de manière que l'on peut éliminer totalement la déformation excessive de la partie d'embouchure cylindrique (P2) due à l'application non uniforme de pression de soufflage sur celle-ci.

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