Ube Industries, Inc.

Ube Machinery Corporation, Ltd.

Hiroyuki Takatori

Akio Okamoto

Yoshiaki Kanoh

Hiroaki Furuya

Fumihiko Shimizu

Hidenobu Ono

Kazuo Kubozoe

Masayuki Tsuruda

Masahiro Kami

Tokuhisa Okada

Junji Ueda

Naoto Yamamoto

Iseo Kamota

Toyoyuki Miyazaki

An injection-foaming molding process for manufacturing a formed article by injecting a molten resin containing a foaming agent into a cavity of a mold being retained in an openable state and then expanding the cavity by opening the mold to allow the resin to foam includes:

Method for expansion injection molding

A stationary platen ( ) and a movable platen ( ), which are connected with each other by tie rods ( ), to which metallic molds are respectively attached, are opened and closed by an electrically driven ball screw mechanism. The movable platen is composed of a platen body and a pressure plate ( ) attached to the platen body which can be contacted with and separated from the platen body. Between the movable platen and the pressure plate, clamping is conducted by the expansion and contraction of a bladder ( ) into which hydraulic oil for clamping can be introduced. The bladder houses an insert die ( ), the shape of which is identical with an internal shape of the bladder, and a hydraulic oil path is formed in the insert die. While a ball screw member ( ) of an electrically driven ball screw mechanism is being supported being capable of moving in the axial direction, a brake means ( ) for restricting rotation is provided, and a mold releasing cylinder mechanism ( ) is connected. The mold releasing cylinder mechanism is operated when it shares a hydraulic pressure supply source for supplying hydraulic pressure to the bladder and the hydraulic oil path is changed over.

Mold clamping device, method of increasing/decreasing pressure for such device, and mold releasing method

A laminating blow molding method for making a hollow article includes the steps of forming 1 to 500 fine, holes per an area of 100 cm.sup.2 in a resin sheet by punching to thereby form projections as burrs on one side of the resin sheet, the diameter of the holes being between 0.1 mm and 1 mm; disposing the resin sheet between an outer surface of a parison extruded from a die and a mold so that the one side with the projections faces a cavity face of the mold; closing the mold so that the resin sheet is held between the cavity face of the mold and the outer surface of the parison; and heating the mold to a temperature exceeding a softening temperature of the resin sheet and simultaneously blowing the parison to perform blow molding. Thereafter, the mold is cooled and a molded article is taken out. In the method, the molded article with smooth outer surface can be obtained.

Blow molding method

An improved process and apparatus for blow molding of engineering plastic materials, using a mold and an extrusion machine with a die for producing a hollow plastic parison to be partially received in the mold. An extrusion operation and a preblowing operation with air from the die into the parison are concurrently commenced at a high extrusion speed and a low air pressure, with a material remaining in the die being integrated with an upstream portion of a preceding parison prepared in a preceding blow molding run, to complete the downstream parison. The upstream portion has a closed and free lower end prepared in the preceding run. The apparatus is provided with a pinching and cutting device for self-adhering and separating the completed parison above and in the vicinity of the mold to prepare the above mentioned closed free end. In an embodiment, a heater is provided to heat the upstream parison portion immediately after the parison is separated into the upstream portion closed at the free lower end and a downstream portion to be received in the mold for blow molding and until immediately before a next extrusion.

Blow molding process and apparatus for producing hollow plastic articles

A polyamide resin composition for fusible core molding which comprises (a) 100 parts by weight of a polyamide resin, (b) 1 to 150 parts by weight of a reinforcing agent and (c) 0.1 to 2.5 parts by weight of a polyvalent alcohol represented by the formula: HO--CH.sub.2).sub.n OH wherein n is an integer of 1 to 6, or polyethylene glycol or polypropylene glycol and a molded product obtained by molding the polyamide resin composition.

Polyamide resin composition for fusible core molding and molded product

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Ube, Japan

Hiroyuki Takatori