Molding method and cooling apparatus for pressure resisting...

B - Operations – Transporting – 29 – C

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B29C 49/64 (2006.01) B29C 49/42 (2006.01) B29C 49/66 (2006.01) B29C 49/78 (2006.01) B29C 71/02 (2006.01) B65D 1/02 (2006.01) B29C 35/16 (2006.01) B29C 49/06 (2006.01)

Patent

CA 2119457

In order to improve the productivity of pressure-resisting bottles by reducing the blow time from 4-5 seconds in a conventional bottle molding method to not more than 3 seconds, and mold pressure resisting bottles free from the occurrence of crazing and bottom-breakage, a biaxially stretched blow molded bottle (1) of a synthetic resin having a big foot type petaloid bottom is produced in a blow time of not more than 3 seconds, and after the product has been released from the mold, the bottom portion (3) has become not higher than 70°C, whereby the shortage of the capability of the metal mold of cooling the bottom portion (3) is supplemented. This allows both the prevention of the irregular deformation of the central part (6) of the bottom portion, and the molding of the bottom portion (3) of high pressure resisting strength and mechanical strength with a sufficient height H of the central part (6) of the bottom portion ensured.

En vue d'améliorer la productivité de bouteilles résistant à la pression en réduisant à 3 secondes au maximum le temps de soufflage de 4-5 secondes dans une méthode conventionnelle de moulage, et de bouteilles résistant à la pression du moule sans occurence de fendillement ou de rupture du fond, une bouteille en résine synthétique moulée par soufflage (1) étirée biaxialement et ayant un fond pétaloïde du type gros pied est produite en un temps de soufflage de 3 secondes au maximum et, une fois le produit sorti du moule, la partie du fond (3) a atteint une température n'excédant pas 70.degrés.C, ce qui supplée au manque de capacité du moule métallique de refroidir la partie du fond (3). Ceci permet à la fois de prévenir la déformation irrégulière de la zone centrale (6) de la partie du fond et de mouler une partie du fond (3) à haute résistance à la pression et haute résistance mécanique en assurant une hauteur H suffisante de la zone centrale (6) de la partie du fond.

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