Nissei Asb Machine Co., Ltd.

Hiroyuki Tsukamoto

Daiichi Aoki

Kazuyuki Yokobayashi

Yoichi Tsuchiya

Masayuki Usami

A blow molding method includes a primary blow molding step that molds a preform () in a primary blow mold (A) that includes a primary temperature control section () to obtain an intermediate molded article (), a shrinkage step that discharges blow air from the intermediate molded article to shrink the intermediate molded article, and a secondary blow molding step that blow-molds the intermediate molded article () that has shrunken in a secondary blow mold that includes a secondary temperature control section () to obtain a final molded article. The primary blow molding step cools a first intermediate molding region of the intermediate molded article that follows a neck using a first primary temperature control section, and the shrinkage step shrinks a second intermediate molding region of the intermediate molded article of which the temperature is controlled by a second primary temperature control section.

Blow molding method, blow mold, and blow-molded container

An embodiment of a method of molding a large returnable container includes a heat treatment step for subjecting a thick preform formed of a polyester resin or a primary blow-molded article to intermediate blow molding with heating to obtain an intermediate molded article, and a final blow molding step that includes subjecting the intermediate molded article that has shrunk to final blow molding with heating to obtain a large returnable container. The heat treatment step includes disposing the preform or the primary blow-molded article in a heat treatment mold, and pressurizing the preform or the primary blow-molded article so that a shoulder and a body obtained by blow molding close contact to a cavity surface of the heat treatment mold, and are subjected to a heat treatment, the shoulder being heated at a low temperature as compared with the body.

Large returnable container, method and apparatus for molding the same, and blow mold with separate heating zones

A preformfor a large container, used for producing a large container which is made of a polyethylene terephthalate resin and which is formed by stretch blow molding, is formed by injecting molding to have a wall thickness of 6 mm to 9 mm and have a longitudinal axis length longer than that of the large container which is a final molded product.

Preform for large container, large container, and method for producing large container

A method of molding a large returnable container includes a heat treatment step for subjecting a thick preform formed of a polyester resin or a primary blow-molded article to intermediate blow molding with heating to obtain an intermediate molded article, and a final blow molding step that includes subjecting the intermediate molded article that has shrunk to final blow molding with heating to obtain a large returnable container. The heat treatment step includes disposing the preform or the primary blow-molded article in a heat treatment mold, and pressurizing the preform or the primary blow-molded article so that a shoulder and a body obtained by blow molding close contact to a cavity surface of the heat treatment mold, and are subjected to a heat treatment, the shoulder being heated at a low temperature as compared with the body.

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Nagano, Japan

Hiroyuki Tsukamoto