Toyo Seikan Kaisha, Ltd.

Japan Crown Cork Co Ltd.

Kiyoshi Kawaguchi

Muneki Yamada

Hideki Yagishi

Makoto Etoh

Yoshitsugu Maruhashi

Go Saito

Hiroyuki Hashimoto

Nobuyuki Kato

Masayuki Sasaki

Masao Ishinabe

Takashi Yazaki

Jun Yonesato

Akira Sakamoto

Minoru Mitsuhashi

Sumio Takeishi

Fumio Kanou

An apparatus for feeding a molten resin is operated for extended periods of time maintaining stability without permitting volatile components of the molten resin to adhere on the surfaces of conveyer means. An extruder in the apparatus for feeding the molten resin to the compression-forming machine has an extrusion unit which discharges a molten resin through an extrusion opening of an extrusion nozzle. An air injection nozzle for injecting the cooling gas is provided along the outer circumference of the extrusion nozzle, and the cooling gas is blown onto the surface of the molten resin extruded from the extrusion opening to cool the surface of the molten resin.

Method of feeding molten resin and apparatus for feeding molten resin

A bottle having substantially no strain due to fluidized orientation in the bottom portion thereof which is homogeneously and uniformly drawn, and, as a result, exhibiting improved shock resistance and buckling strength in the bottom portion, featuring excellent resistance against environmental cracking at the center in the bottom portion, without developing crazing or whitening during the preservation, and offering excellent appearance. The bottle is formed by biaxially stretch-blow-molding a thermoplastic resin, and has a mouth portion, a shoulder portion, a barrel portion and a bottom portion, said bottom portion without being substantially affected by the residual strain due to orientation by fluidization.

Plastic bottle and method of producing the same

A safety screw cap indicates prior opening of a container to protect consumers from prior contamination. The screw cap has an annular band encircling its lower end which is separated from the screw cap by a perforated line. The band is affixed to a fixing clement and the fixing element attached to the container when the screw cap is screwed in place. An unattached leader portion of the band can be lifted easily to peel the band from the container. As the band is peeled from the container, it is simultaneously tom from the screw cap at the perforations. Once the band is removed, the screw cap can be unscrewed and the container unsealed. Before peeling the band away, the screw cap cannot be unscrewed without causing obvious damage to the screw cap or band. In addition, the torque required to shear-separate the band from the fixing element, the fixing element from the container or the screw cap from the band is greater than that which can be applied easily by a normal adult.

Tamper-revealing screw-cap for a container

The running length of an inner synthetic resin within an outer synthetic resin in a composite synthetic resin is reduced by flowing a forced synthetic resin flow behind intermittent flows of the inner synthetic resin. The forced synthetic resin is of the same type as the outer synthetic resin. The composite resin flowing out of the apparatus is cut with a heated wire.

Method for forming composite synthetic resin material

A nozzle device for extruding multiple synthetic resins as a resin composite, having a main extrusion flow passage having a main extrusion opening, a subsidiary extrusion flow passage having a subsidiary extrusion opening, at least a downstream portion of the subsidiary extrusion flow passage being disposed in the main extrusion flow passage, and an opening-closing member for opening or closing the subsidiary extrusion opening. The nozzle device further has an auxiliary extrusion flow passage which has an auxiliary extrusion opening and at least a downstream portion of which extends through the main extrusion flow passage as it surrounds the downstream portion of the subsidiary extrusion flow passage. The auxiliary extrusion opening is positioned downstream of the subsidiary extrusion opening and the downstream end portion of the auxiliary extrusion flow passage has a tapered part. The auxiliary extrusion flow passage is designed such that when the opening-closing member is held at a position at which it closes the subsidiary extrusion opening, a synthetic resin flowing through the auxiliary extrusion flow passage and extruded into the main extrusion flow passage through the auxiliary extrusion opening flows while undergoing collision with the forward end portion of the opening-closing member.

Apparatus for extruding multiple synthetic resins

Disclosed is a synthetic resin feeding apparatus including an extruder having an extrusion plate with an extrusion opening formed therein and a cutting tool for cutting molten synthetic resin extruded from the extrusion opening. The extrusion plate is formed to have a tapered portion. The extrusion opening opens to the front end surface of the tapered portion.

Apparatus for feeding and cutting synthetic resin

A nozzle device for extruding multiple synthetic resins as a resin composite, including a main extrusion flow passage having a main extrusion opening, a subsidiary extrusion flow passage having a subsidiary extrusion opening, at least a downstream portion of the subsidiary extrusion flow passage being disposed in the main extrusion flow passage, and an opening-closing member for opening or closing the subsidiary extrusion opening. The nozzle device has an auxiliary extrusion flow passage which has an auxiliary extrusion opening and at least a downstream portion of which extends through the main extrusion flow passage as it surrounds the downstream portion of the subsidiary extrusion flow passage. The auxiliary extrusion opening is positioned downstream of the subsidiary extrusion opening and the downstream end portion of the auxiliary extrusion flow passage has a tapered part. The auxiliary extrusion flow passage is designed such that when the opening-closing member is held at a position at which it closes the subsidiary extrusion opening, a synthetic resin flowing through the auxiliary extrusion flow passage and extruded into the main extrusion flow passage through the auxiliary extrusion opening flows while undergoing collision with the forward end portion of the opening-closing member.

Nozzle device for extrusion of multiple synthetic resins

Plastic cap

A method of compression molding of a synthetic resin material in the heat-melted state by the cooperative action of a male mold assembly and a female mold assembly. The female mold assembly includes an outside member having a central opening and an inside member movable relative to the outside member through the central opening. A pre-mold-closing step of moving the outside member to a predetermined closed position is carried out, and thereafter, a compression molding step of moving the inside member to a predetermined closed position and compressing the synthetic resin material is carried out. Also provided is a synthetic resin feeding apparatus including an extruder having an extrusion plate with an extrusion opening formed therein and a cutting tool for cutting the synthetic resin in the heat-melted state extruded from the extrusion opening. A tapered portion is formed in the extrusion plate, and the extrusion opening is opened to the front end surface of the tapered portion.

Method of compression molding synthetic resin

A multilayer compression-molded article produced by compression-molding a composite plastic material. The composite plastic material comprises a first synthetic resin and a second synthetic resin in which the first synthetic resin surrounds substantially the entire second synthetic resin. The compression-molded article comprises a first resin layer molded from the first synthetic resin and a second resin layer molded from the second synthetic resin in which the first resin layer surrounds substantially the entire second resin layer. The composite plastic material is obtained by an extrusion apparatus which intermittently extrudes the second synthetic resin via a subsidiary extrusion flow passage into a main extrusion flow passage in which the first synthetic resin flows.

Compression-molded article having multilayer structure

Method of extruding and compression molding a multilayered article

A tubular plastic container having a molecularly oriented sidewall portion is made by bringing the peripheral portion of a solid blank in engagement with the shoulder portion of a die, introducing the blank into a cavity of the die while compressing with a first and second plungers, such that in the former stage of the introduction, the speed is relatively low and the pressure is relatively high, and then the speed is increased at a controlled rate and the pressure is decreased, thereby forming a hollow molded piece, and then expanding the molded piece to bringing the sidewall portion thereof into contact with the inner surface of the cavity. In the similar manner a tubular plastic container having a sidewall portion formed with thick wall portions axially extending and having a relatively large wall thickness and a large curvature, and thin wall portions axially extending and having a relatively small wall thickness and a small curvature which are formed alternately in the circumferential direction, is made by using the second plunger having recesses corresponding to the thick wall portions and having open edge portions.

Method and apparatus for making a plastic container and an improvement

Method for making a plastic container

The peripheral portion of a flat, molecularly orientable material stock of substantially uniform thickness having a temperature below the upper limit of the molecularly orientable temperatures of the plastic material is clamped, and the central portion of the plastic material stock is introduced into a die cavity while compressing the central portion with an upper plunger and a lower plunger, thereby forming a hollow preform having a sidewall portion made from the plastic material which has been forced out from between the upper plunger and the lower plunger, while the sidewall portion is kept in contact with the side surface of the upper plunger kept at about molecularly orientable temperature. Thereafter, while the upper plunger is returning, a fluid under pressure is supplied into the hollow preform to expand radially the sidewall portion, so that the sidewall portion is brought into contact with the inner surface of the die cavity kept at a temperature below the lower limit of the molecularly orientable temperatures for cooling and solidifying. Thus, the sidewall portion of a plastic hollow article is formed from the sidewall portion of the hollow preform, and a plastic hollow article having a flange portion, the sidewall portion which is molecularly oriented, and a bottom wall portion is made.

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Yokohama, Japan

Kiyoshi Kawaguchi