Nissei Asb Machine Co., Ltd.

Kouhei Koga

Yoshinori Nakamura

Satoru Kosuge

Yoshihiro Fukunishi

Daiichi Aoki

Hidehiko Fukai

Tsuyoshi Matsui

Toshio Fujiwara

Tomoyoshi Kawanami

A preform molding method and apparatus which can utilize a part of an injection mold to crystallize a neck of a preform. A rotary disc includes a plurality of neck cavity molds. An injection molding station, first heating station, second heating station and cooling/removing station are located at the respective positions where the neck cavity molds stops. The injection molding station injection molds a preform having a neck. The preform is sequentially conveyed the first and second heating stations while being held by neck cavity molds at the neck. Each of the heating stations heats the neck cavity molds so that the neck of the preform is heated up to a temperature of crystallization. Thereafter, the cooling/removing station cools the neck cavity molds. After the cooling step, the preforms are released and removed from the neck cavity molds. Thereafter, the neck cavity molds are returned to the injection molding station.

Method and apparatus for forming preforms with crystallized necks

An injection stretch blow molding method blow molds a preform into a hollow member while maintaining the preform at a temperature provided by an injection molding step. The method circulatively conveys neck mold support plates each for supporting and conveying a neck mold holding the neck portion of the hollow member or preform through working stations of M in number (M.gtoreq.3) including at least injection molding and blow molding stations. The total number N of neck mold support plates is set to be 2.ltoreq.N&lt;M. The neck mold support plates are conveyed among the working stations other than the injection molding station within an injection molding time T for which an injection molding step is carried out using a neck mold support plate placed in the injection molding station. Before elapse of the injection molding time T, a neck mold support plate, which has ejected the molded hollow member, is caused to wait at a station before the injection molding step. After passage of the injection molding time T, two neck mold support plates resident in the injection molding station and another working station before the injection molding station are simultaneously conveyed to subsequent stations.

Method and apparatus of injection stretch blow molding

The present invention provides a blow molding process having the steps of conveying preforms to a blow molding stage while holding the preform by two rows of supporting plates, placing the preforms in two rows of blowing molds disposed corresponding to the supporting plates, blow molding the preform into hollow containers when tile blowing molds are in their closed positions, thereafter opening the blowing molds to remove the molded containers therefrom. On carrying out this blow molding process, the row pitch between the supporting plates is changed between one when the blowing molds are opened and another when the blowing molds are in the other conditions. By utilizing this process and an apparatus for carrying out the process, the row pitch between the supporting plates is not required to maintain the maximum pitch when the blowing molds are opened. Thus, the blow molding system may be reduced in size and occupying area.

Blow molding method

A blow molding apparatus having two rows of holding plates each for holding a plurality of preforms; supporting and conveying means for conveying the two rows of holding plates into a blow molding station while slidably supporting the holding plates so that the row pitch in the rows is variable; two rows of blow molds arranged in the blow molding station corresponding to the two rows of holding plates, each row of the blow molds being adapted to blow mold the preforms; and a linkage for changing and setting the row pitch in the rows of holding plates. The linkage includes two first support shafts arranged respectively on the opposite end faces of the two rows of holding plates in a direction perpendicular to the direction of the pitch; two first links each rotatably supported around the corresponding one of the first support shafts; and two second support shafts each for rotatably supporting the other end of the corresponding one of the first link in the coaxial or non-coaxial manner, whereby the row pitch of the holding plate rows can be changed by the vertical movement of the second support shafts.

Blow molding apparatus varying pitch between holding plate rows

An injection stretch blow molding apparatus performs a cycle of molding steps by circulating a plurality of neck mold sets for holding the neck portions of preforms. In a first portion of the operating sequence, a neck mold used in the injection molding stage to mold a preform, is conveyed from one end of a horizontal path of movement for conveying said neck mold to the stretch blow molding stage disposed at the other end of the horizontal path of movement. In a second portion of the operation sequence a neck mold, from which a blow molded product has been ejected in the ejection stage, offset vertically from the middle of the horizontal path of movement, is returned back to the injection molding stage, which is empty, through a vertical path of movement connecting the horizontal path of movement with the ejection stage and through the horizontal path of movement, after the first portion of the operating sequence has started. In a third portion of the operating sequence a neck mold, holding a container blow molded in the stretch blow molding stage, is conveyed to the ejection stage, which is empty, through the horizontal and vertical paths of movement after the second portion of the operating sequence has started. The entire system can be reduced in size, with the span between the tie rods being minimized and with the space of installation being reduced, even if a container having an increased bore diameter is to be molded in this system.

Injection stretch blow molding apparatus

The present invention provides a blow molding apparatus which conveys preforms to a blow molding stage while holding the preform by two rows of supporting plates, places the preforms in two rows of blowing molds disposed corresponding to the supporting plates, blow molding the preform into hollow containers when the blowing molds are in their closed positions, thereafter opening the blowing molds to remove the molded containers therefrom. In this blow molding apparatus the row pitch between the supporting plates is changed between one when the blowing molds are opened and another when the blowing molds are in the other conditions. In this apparatus, the row pitch between the supporting plates is not required to maintain the maximum pitch when the blowing molds are opened. Thus, the blow molding system may be reduced in size and occupying area.

Blow molding apparatus

An injection stretch blow molding process performs a cycle of molding steps by circulating a plurality of neck mold sets for holding the neck portions of preforms. The first step is conveying a neck mold, by which a preform has been molded in the injection molding stage, disposed at one end of a horizontal path of movement for conveying said neck mold to the stretch blow molding stage disposed at the other end of the horizontal path of movement. The second step is returning a neck mold, from which a blow molded product has been ejected in the ejection stage, offset vertically from the middle of the horizontal path of movement, back to the injection molding stage, which is empty, through a vertical path of movement connecting the horizontal path of movement with the ejection stage and through the horizontal path of movement, after the first step has started. The third step is conveying a neck mold, holding a container blow molded in the stretch blow molding stage, to the ejection stage, which is empty, through the horizontal and vertical paths of movement after the second step has started. The entire system can be reduced in size, with the span between the tie rods being minimized and with the space of installation being reduced, even if a container having an increased bore diameter is to be molded in this system.

Injection stretch blow molding process of performing a cycle of molding

The present invention relates to a rotary type injection molding machine including a base plate provided in its surface with a rotary disk having hold molds at three portions on the lower surface thereof and having required core insert holes bored at stop positions of the hold molds, a support post on a machine bed vertically movably supporting the base plate and the rotary disk in the central portion thereof, the support post being intermittently rotated together with the rotary disk, a vertical clamping device on the machine bed in which one of the stop positions of the hold molds serves as an injection molding section and a clamping plate having a core mold at the lower side thereof is connected by movable tie bars on opposite sides to be positioned upwardly of the base plate, and an injection mold secured to the machine bed of the injection molding section, the base plate being movably supported by the movable tie bars and linked to the clamping device, an upper portion of the support post being carried by the base plate.

Rotary type injection molding machine

Secondary injection molding machine for hollow molded products

Rotary type injection blow molding machine

A mold device for molding a preform in which a lip mold is provided on the lower surface of a transfer plate rotatably mounted above a machine bed, and the lip mold is moved up and down together with a core mold to carry out opening and closing a mold without vertically moving the cavity mold with respect to the lip mold or without vertically moving the transfer mold together with the lip mold with respect to the fixed cavity mold.

Mold device for molding a preform

The present invention provides a new injection stretching blow molding machine in which supporting of a base plate is made possible from both peripheral edge portion and central portion of the base plate merely by chaning the shape of a rotary disk, and the number of tie bars for a mold clamping device may be increased to execute high pressure mold clamping.

Growing community of inventors

Ueda, Japan

Kouhei Koga