Nissei Asb Machine Co., Ltd.

Hiroyuki Orimoto

Fumiya Amari

Saburo Suzuki

Katsumasa Yokota

Yoshinori Nakamura

Daiichi Aoki

Koichi Sato

Hidehiko Fukai

Kouichi Sato

Yoshiki Miyazawa

Yoji Okuda

Kazumi Machida

A container molding method for reducing the amount of released acetaldehyde. The method comprises a primary blow molding step of stretch-blow-molding a preform into a primary blow-molded article; an acetaldehyde reducing step of reducing the amount of acetaldehyde released from the primary blow-molded article; and a final blow molding step of stretch-blow-molding the primary blow-molded article having a reduced amount of acetaldehyde into a final container. The primary blow molding step molds the primary blow-molded article which is larger in size than the final container and which has an average wall-thickness of a stretched barrel portion equal to or less than 0.3 mm, that is smaller than the average wall-thickness of a barrel portion of the final container. The acetaldehyde reducing step heats the thin-walled barrel portion of the primary blow-molded article at a high temperature for a relatively short time. As a result, the final container having a reduced amount of acetaldehyde released from the inner wall of the final container will be molded.

Container having a reduced amount of acetaldehyde released therefrom and method of molding the same

A resin container has a bottom structure which has a central recessed portion containing substantially no crystal, a marginal raised portion crystallized by molecular orientation, and an intermediate ring-shaped portion crystallized to have spherulite-like crystals. The bottom structure highly improves the heat-resistance at the intermediate portion, while maintaining the central recessed portion at a good impact-resistance.

Biaxially oriented crystalline resin container and process of making the

A container, which may be injection molded in a single mold, includes a main body and a hollow cylindrical neck. The neck extends along a main axis and has a proximate end connected to the main body and an open distal end. The neck includes a generally cylindrical inner layer formed of a first thermoplastic material, a generally cylindrical middle layer located radially outward of the inner layer and formed of a second thermoplastic material having a greater heat resistance than the first thermoplastic material, and a generally cylindrical outer layer located radially outward of the middle layer so that the middle layer is at least partially sandwiched between the inner and outer layers. The outer layer is formed of the first thermoplastic material. An open end section extends from and is integral with the middle layer, is formed with the second thermoplastic material, and extends radially along the entire radial extent of the open distal end of the neck so that the entire open distal end of the neck is formed by the open end section.

Heat-resistant construction of a neck of a synthetic resin container

A heat-resistant container forming method includes a step of thermally shrinking a primary blow molded article in a heating furnace before secondary blow molding the primary blow molded article into a final product or container. Into the furnace, hot air which flows along the longitudinal direction of the first blow molded article and whose temperature enough to facilitate crystallization of the primary blow molded article. The primary blow molded article is thermally shrunk by exposing the entire circumferential surface of a barrel of the primary blow article to the hot air and by blowing the hot air longitudinally along the primary blow molded article to heat the barrel circumferentially uniformly. Since hot air touches the barrel as flowing longitudinally thereof, it is possible to increase the heat conductivity of boundary film of the primary blow molded article, without increasing the hot air temperature too high, so that temperature rise of the primary blow molded article is facilitated.

Method for forming heat-resistant containers

A method of producing a blow-molded PET container suitable for hot-filling includes the steps of injection molding a preform, blow-molding the preform into a primary molded article larger than the desired final container, heating the primary article in a series of oven chambers while its mouth is sealed so that pressure builds within the article to thereby control shrinkage, and blow-molding the shrunken article into the desired container. The two molds are preferably heated, and the mold contact time is as long as allowed by the manufacturing process to help remove internal stresses in the article. An apparatus for carrying out the method includes a first machine having an injection station, a thermal conditioning station, a primary blow-molding station, and an exit station. A second machine includes the oven chambers and a final blow-molding station. The primary article is sealed by a cap member that has a pressure relief valve connected to it to limit the internal pressure during heating, an air supply passage for final blow-molding, and a tensioning rod for insertion into the primary article and engaging a pocket in the center of the article's bottom. In some applications, it is necessary to stiffen the neck, particularly when hot-filling at about 200.degree. F. or higher, or when using a closure roll-on die or a lugged neck finish to apply a bottle cap to the final container.

Method and apparatus for manufacturing biaxially oriented, thermally

An apparatus for blow-molding PET containers suitable for hot-filling includes a first machine having an injection station, a thermal conditioning station, a primary blow-molding station, and an exit station. A second machine includes the oven chambers and a final blow-molding station. The primary article is sealed by a cap member that has a pressure relief valve connected to it to limit the internal pressure during heating, an air supply passage for final blow-molding, and a tensioning rod for insertion into the primary article and engaging a pocket in the center of the article's bottom. In some applications, it is necessary to stiffen the neck, particularly when hot-filling at about 200.degree. F. or higher, or when using a closure roll-on die or a lugged neck finish to apply a bottle cap to the final container.

Apparatus for manufacturing biaxially oriented, thermally stable blown

A plastic vessel preform includes a neck portion having an outer layer formed by an insert piece (20) which includes a thread portion (22a) and a support ring (28). The support ring (28) includes a bond reinforcing portion (36) integrally formed therein in a direction perpendicular to the axis or the preform body (34). The bond reinforcing portion (36) strengthens the radial bond in the insert piece (20) so that the mechanical strength at the neck portion (32) of the preform (30) can be greatly increased.

Plastic vessel preform and mold for forming the same

Apparatus for forming a heat-resistant container

A method of manufacturing a heat resistant plastic vessel including: injection molding a preform; primary stretch blow molding the preform to obtain a primary blow-mold object; heat-shrinking the primary blow-mold object; and secondary stretch blow molding the heat-shrunk object to obtain a secondary blow-mold object as a heat-resistant plastic vessel. In the primary stretch blow molding process, a concavity is formed on a body of the primary blow-mold object. The concavity has a thickness larger than the other body portion. In the heat-shrunk object, the large thickness portion has a lower heat retaining capacity than the other body portion. The heat-shrunk object then undergoes the secondary stretch blow molding process, thereby obtaining the secondary blow-mold object, which has a large thickness portion corresponding to the concavity of the primary blow-mold object to assure high mechanical strength such as buckling strength of the final product.

Method of molding heat-resistant vessel having thick portion on body

A multi-layer forming nozzle includes a valve member which can open and close a flow passage for molten resin which forms an intermediate layer of a multi-layer molded product by injection molding. The valve member is operated in response to resin pressure differentials at the front and back of the valve member to accurately switch from a multi-layer operation to a single layer operation and vice versa. A three-layer nozzle in accordance with the invention has a nozzle body provided interiorly with a first resin path, a second resin path and a third resin path in the form of a concentric circle bending to the same injection opening. The valve member is located either in a mouth portion of the third resin path in the central portion positioned internally of a mouth portion of the second resin path or a mouth portion of the second resin path in the intermediate portion positioned internally of the first resin path. The valve member is moved forward and backward in response to resin pressure differentials to open and close the valve member.

Multi-layer molding nozzle

Method of inserting a piece into a mold for molding a mouth of a preform

A method of forming a multi-layered vessel by injection molding a multi-layered parison and subsequently blow-molding the parison to form the multi-layered vessel. The parison is formed having inner and outer wall layers and an intermediate gas barrier layer. The intermediate layer is positioned between the inner and outer wall layers such that the ratio of the wall thickness of the outer layer to that of the inner layer is most preferably in the range of 1:3.50.

Method for molding multi-layered vessels

The present invention provides a multi-layered vessel whose sectional construction comprises at least a triple-layer obtained by blow or orientation blow molding an injection molded multi-layered parison, comprising a first resin forming a body, and a second resin having gas barrier properties or heat resistance more than that of the first resin, the second resin being present as an intermediate layer of the body within the first resin, the intermediate layer being smaller in wall thickness than an outer layer of the body and being one-sided toward the outer layer, the first layer being defined into an inner layer and an outer layer by the intermediate layer, the wall thicknesses of the outer layer and the inner layer being in the ratio of outer layer to inner layer, 1:1.50 or more, preferably, in the range of 1:3.50.

Growing community of inventors

Ueda, Japan

Hiroyuki Orimoto