Aoki Technical Laboratory, Inc.

A.k. Technical Laboratory, Inc.

Shigeto Aoki

Naohide Matsuzaka

Kazuhide Hasegawa

An injection apparatus is configured to feed a molten resin into an injection molding section of an injection stretch blow molding machine. The injection apparatus uniformly melts a resin material while the duration from the time of starting plasticizing and kneading till completion of injection is shortened, thereby allowing the operation of the injection apparatus to fall within the time corresponding to the reduced injection molding process in the injection stretch blow molding machine. Thus, the molding cycle for a hollow body is reduced. In this context, at the start of the filling for each injection cycle, the injection apparatus starts plasticizing and kneading for generating the molten resin for injection in the next injection cycle.

Injection method and injection apparatus for molten resin, and injection stretch blow molding machine using injection apparatus

When a hollow molded body using a preform to be molded with a thin bottom portion is produced while taking advantage of the roughening of the outer surface of an injection core mold, transferred roughening marks are prevented from appearing on the bottom portion of hollow molded bodies, so that the hollow molded body with an aesthetic bottom portion is obtained. An injection core mold () has an outer surface of its tip portion corresponding to a preform bottom portion () and a lower end portion () of a preform body portion (). The outer surface corresponding to the preform bottom portion () and the lower end portion () of the preform body portion () is a mirror-finished surface (), and the outer surface of the injection core mold for forming the preform other than the mirror-finished surface is a roughened surface ().

Injection molding mold, injection stretch blow molding machine, and method for producing hollow molded body

An object is to provide an injection stretch blow molding machine and a method for molding a polyethylene container capable of molding a favorable hollow container even if its preform is released from an injection mold early. The injection stretch blow molding machine and the method for molding a polyethylene container molds a preform by injecting and filling a molten polyethylene resin into an injection mold, which includes a cavity mold and a core mold both cooled to a temperature range of 5&#xb0; C. to 25&#xb0; C., transfers the molded preform to a blow molding mold, and molds a hollow container by blowing the preform within a time range of &#xb1;2 sec from a point in time when a temperature of the preform reaches a first minimum point after a point in time when the injection mold completes being opened.

Injection stretch blow molding machine and method for molding polythylene container

According to the present invention, in order to improve the productivity of an injection stretch blow molding machine, when a core mold is lifted during mold opening at an injection molding part of the injection stretch blow molding machine, stress is dispersed so as not to concentrate at an area where the thickness changes between a preform opening and a preform body so that the preform body is inhibited from being lifted at a skin layer formed in the area where the thickness changes between the preform opening and the preform body. In a preform () where a skin layer () at the surface has a lower temperature than a middle layer () so as to allow a preform body () and a preform bottom () to expand and deform from the inside of the preform toward the outside of the preform, the skin layer () bridging between the inner surface of the preform body () and the inner surface of the preform opening () is formed in a tapered shape that opens upward at an outward slant with respect to an extension line () of the inner surface of the preform body () extending above the skin layer () so that, during the lifting of the core mold, the stress exerted from the preform body () is dispersed at a stress dispersing plane section () formed with the skin layer ().

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Nagano, Japan

Shigeto Aoki