Sumitomo Chemical Company, Limited

Hosokawa Seisakusho Co., Ltd.

Other

Nissen Chemitec Corporation

Takashimaya Nippatsu Kogyo Co., Ltd.

Masahito Matsumoto

Nobuhiro Usui

Takahisa Hara

Shigeyoshi Matubara

Takeo Kitayama

Shigeyoshi Matsubara

Yoshiaki Togawa

Satoru Funakoshi

Ryuichi Ishitsubo

Shohei Masui

Toshihiro Hosokawa

Syohei Masui

Makoto Nagata

Masaaki Tsutsubuchi

Hiromu Fujita

Yuji Kamiji

Yukito Nakamura

Hiromasa Nakatsuka

Hitoshi Nakada

Satoru Gotoh

Toru Yabe

Seiji Terashima

Akihiro Furuta

Hiroyuki Harada

Tatsuo Hamanaka

Yoshitaka Kobayashi

Kazuo Hieda

Kenichi Higashi

Hitoshi Murotani

Kiyoshi Ogura

Tohru Yabe

Tadayuki Oda

Koji Yamashita

Youichi Fujiyama

Takashi Watanabe

Masahiro Shinohata

Satoru Funkakoshi

Sigeyoshi Mathubara

A mold for producing a hollow thermoplastic resin molded article includes a set of female and male mold members and a gas passage provided in at least one of the mold members which opens directly onto a surface of the mold member. Alternatively, a gas introducing member for introducing gas into a cavity may be provided in communication with the gas passage such that the tip of the gas introducing member does not protrude into the cavity of the mold. A lagging material, such as an insulating material or a local heater is preferably provided in the area of the mold adjacent the gas passage or gas introducing member. A method of producing a thermoplastic resin molded article using a mold of this nature is also disclosed.

Mold for production of hollow thermoplastic resin molded article, and process for production of hollow thermoplastic resin molded article using the same

The present invention relates to a metal mold for producing a synthetic resin molded product in a compression-molding method, which is comprises a pair of male and female molds which are allowed to mutually slide over a contact face, with the outer circumferential face of the male mold and the inner circumferential face of the female mold serving as sliding portions at the time of mold-clamping, characterized in that either the male mold or the female mold or both of the molds is constituted by a mold main body and a sliding member. The sliding member forms a portion of the metal mold over the entire sliding portions or on a portion thereof, and is removably attached to the mold main body. The same metal mold may be used for production of a non-laminated synthetic resin molded product and a laminated product having the same design by replacing only the sliding member, without the need for using different molding devices corresponding to the respective production processes.

Metal mold for producing a synthetic resin molded product in a compression-molding method

A multilayer molded article comprises a resin body and a skin material which covers a part of the surface of the resin body so that an edge part of the skin material present on the surface of the resin body is placed in a groove formed on the surface of the resin body. The article is produced by providing an unclosed mold comprising a lower mold having at least one pin for fixing the edge part of the skin material at a position where the edge part of the skin material is placed and an upper mold having a kick for forming the groove, placing the skin material on the lower mold and fixing the edge part of the skin material with the pin, supplying a mass of resin melt between the skin material and the lower mold, and closing the upper and lower molds to form the multilayer molded article.

Process for producing a multilayer molded article

An instrument panel is provided having a skin material integrally bonded to the surface of a thermoplastic resin core material. The panel is obtained by feeding the skin material to a cavity between a pair of male and female molds having been designed so as to give a desired instrument panel shape, and press-molding a molten thermoplastic resin after or while feeding the molten thermoplastic resin to the cavity between the skin material and the male mold or the female mold. Brackets are formed integrally, by press-molding, with the core material resin on opposing end portions and at a back portion of the instrument panel.

Instrument panel

Mold for compression molding a resin article

Multilayer molded article

A multilayer molded article with good appearance is produced by supplying a skin material and a melt of a thermoplastic resin between unclosed upper and lower molds and simultaneously molding the thermoplastic resin to form a molded article and laminating the skin material on a part of a surface of the molded article by pressing and cooling the thermoplastic resin in the molds, in which the lower mold has a protruding part at a position where an edge of the skin material is located, the upper mold has a depressed part at a position corresponding to the protruding part of the lower mold, and, during molding, the edge of the skin material is fixed to the lower mold by sucking it through a gap which opens at the root of the protruding part.

Process for producing multilayer molded article

There is provided a process for producing a multi-layer molded product having a plurality of thermoplastic resin layers. This process provides for (i) a step of supplying first and second molten thermoplastic resins each through first and second resin supplying gates which are temperature-controllable independently of each other, to between female and male molds kept in an open state with a time difference being provided between supply starts of the first and second resins, and (ii) a step of closing the female and male molds after completion of supply of the first and second resins. The process enables production of high-quality multi-layer molded products having a plurality of resin layers with good repeatability under relatively low resin supply pressure and by single mold closing. Further, high-quality multi-layer molded products can readily be produced without restrictions on materials used.

Process for producing multi-layer molded product

A discharge device for discharging solids of a thermoplastic substance and fibers includes a discharge passage extending longitudinally and having an inner wall surface forming a passage opened at its lower end, a solid supply device for supplying the solids of the thermoplastic substances to a first position in the passage and a fiber supply device for supplying the fibers to a second position in the passage. A cross line on which a part of the inner wall surface extending downward from an upper one of the first position and the second position intersects a vertical plane forms an angle of 0 to 30&deg; with respect to a vertical line, or all tangent lines for the cross line form angles from 0 to 30&deg; with respect to a vertical line.

Discharge device for mixing and discharging solids of thermoplastic substance and fibers and plasticizing device having this device

A molded article of a thermoplastic resin with good apperance which may have a skin material is produced by providing upper and lower molds having a product part-molding section and a non-product part-molding section, supplying a melt of a thermoplastic resin in a cavity of the molds or a space between the skin material and either one of the upper and lower molds through a resin melt passage which is formed in a wall of one of the molds and has an opening for supplying the melt in the non-product part-molding section when a clearance of the cavity is larger than a thickness of a finally produced article, closing the molds to effect press molding, cooling the molds.

Method for producing molded article of thermoplastic resin

A multilayer molded article having a core layer and a skin material laminated on the core layer is produced by providing a skin material between a pair of upper and lower molds, supplying a thermoplastic resin melt between the skin material and one of the molds, closing the molds to press and form the resin melt while holding edges of the skin material with pins provided on a skin material-fixing frame which moves along an outer peripheral wall of one of the upper and lower molds, and cooling the molds and removing the multilayer molded article from the molds.

A hollow molded article having no sink marks on its surface and having an excellent appearance is produced by filling a mold cavity with a resin being in a molten state and then ejecting at least a part of the resin by sucking through a resin-ejection opening and introducing gas through a gas-introduction opening into the resin inside of which being in a negative pressure. According to this process, the use of a high-pressure gas is not required.

Process for producing thermoplastic resin hollow molded article

A laminated skin material comprising an olefin thermoplastic elastomer composition layer and an olefin resin foam layer which does not cause undesirable break, unevenness and wrinkle of the skin material when a laminated molded article is produced by disposing the laminated skin material between male and female molds, feeding a molten thermoplastic resin between the laminated skin material and the male or female molds, and integrally laminating the skin material and thermoplastic resin; a molding method using the laminated skin material, a molding method in which a laminated skin material used in the method is preheated which give a laminated molded article having good appearance and the laminated molded article.

Laminated skin material, molding method and laminated molded article

Molds useful in the production of polythermal plastic resin articles are disclosed. One of the molds disclosed contains a set of a female mold member and a male mold member having opposing mold surfaces respectively, wherein at least one of the mold members has a gas passage therein; and a gas introducing member having a tip and a gas path extending therethrough, the gas introducing member being disposed in at least one of the mold members such that the tip does not protrude from its respective mold surface, the gas path being in communication with the gas passage, wherein the gas introducing member is a molded piece having at least one of grooves in a peripheral part or penetrating holes through an interior thereof, with the grooves and holes communicating with the gas passage.

Mold useful in the production of hollow thermoplastic molded articles

An impact energy absorptive structures is made of usual plastic materials suitable for molding processing, and is designed to suit different degrees of impact loading anticipated in various applications. The impact energy absorptive structures is composed of a base member 11 and protruding rib members including long and short members, in which the proportion of the cross sectional area of the long rib members is between 0.3 to 0.8 of the total cross sectional area of the rib members. Other design modifications can be made readily to customize the impact resistance of the impact energy absorptive structures.

Impact energy absorptive structures

Growing community of inventors

Osaka, Japan

Masahito Matsumoto