The Japan Steel Works, Ltd.

Hitachi Cable, Inc.

Hitachi, Ltd.

Jun Kakizaki

Yoshihiko Iwamoto

Kiyoshi Handa

Yohei Shimizu

Takanori Yamazaki

Toshiharu Goto

Takeshi Yamaguchi

Makoto Ishikawa

Seiji Takamoto

Makoto Tojo

Masaaki Mukaide

Daigo Saga

Hiroaki Shintani

Masao Tsurui

Yoshinori Suto

Jin Ogawa

Koji Tamura

Reo Fujita

Toshifumi Ohashi

Katsuaki Osato

Muneo Omura

Katsuhiro Oda

An extruder which can be applied to various types of resin and elastomer without having to replace a die is provided. An extruder of the present inventions has: a barrel to which raw material, that is raw elastomer or raw material resin, is supplied; a screw that is driven to rotate in the barrel in order to process the raw material together with the barrel; and diethat is provided at a discharge point of the barrel and that discharges the raw material that has been processed. Dieincludes first flat platehaving at least one first holeand second flat platehaving at least one second hole, wherein first flat plateand second flat plateare arranged adjacent to each other along longitudinal axis Xof the barrel, and at least either first flat plateor second flat plateis movable relative to the other flat plate such that an overlapping part of first holeand second holecan be varied.

Extruder and die for the same

According to the present invention, devolatilization of a synthetic resin formed from a polymer or synthetic rubber can be improved and the synthetic resin can be foamed at a low temperature by injecting a devolatilization agent through a devolatilization agent injection nozzle provided in a downstream end segment cylinder of a cylinder assembly. In a vented twin-screw kneading extrusion apparatus and extrusion method according to the present invention, a devolatilization agent, which is injected through a downstream end devolatilization agent injection nozzle provided on a downstream end segment cylinder constituted by a segment cylinder positioned on a downstream end of a cylinder assembly, is dispersed in molten resin in the downstream end segment cylinder and kneaded by a downstream end kneading portion such that the molten resin is foamed by the devolatilization agent and then extruded.

Vented twin-screw kneading extrusion apparatus and extrusion method

According to the present invention, devolatilization of a synthetic resin formed from a polymer or synthetic rubber can be improved and the synthetic resin can be foamed at a low temperature by injecting a devolatilization agent through a devolatilization agent injection nozzle provided in a downstream end segment cylinder of a cylinder assembly. In a vented twin-screw kneading extrusion apparatus and extrusion method according to the present invention, a devolatilization agent, which is injected through a downstream end devolatilization agent injection nozzle () provided on a downstream end segment cylinder constituted by a segment cylinder () positioned on a downstream end of a cylinder assembly (), is dispersed in molten resin in the downstream end segment cylinder () and kneaded by a downstream end kneading portion () such that the molten resin is foamed by the devolatilization agent and then extruded.

A twin screw extruder () according to the present invention is a twin screw extruder (), in which a reinforcing fiber is fed through an input port () into a molten thermoplastic resin having been formed in a resin feed part () and the reinforcing fiber and the molten thermoplastic resin pass through a kneading part () so that a fiber-reinforced resin composition is manufactured, wherein the kneading part () is provided at the discharge-side end part of the extruder (); a conveying part () is provided between the input port () and the kneading part (), and tip clearance (Sc) of a screw element () configuring the conveying part () is larger than screw clearance (Ss).

Twin screw extruder for use in manufacturing fiber-reinforced resin composition and process for manufacturing fiber-reinforced resin composition

A vent assembly device for a twin-screw extruder includes a vent assembly () that has a vent opening () and that is provided in a cylinder () of a twin-screw extruder () having a left axis-side screw () and a right axis-side screw (). The size of at least the vent opening () of the vent assembly () can be freely modified by forming the vent assembly () from a plurality of vent assembly units () and by providing the plurality of vent assembly units () for one vent opening ().

Vent assembly device for twin-screw extruder

A screw pair includes first and second screws having an outer circumferential surface on which a groove is spirally formed, and transports a raw material in a first direction along each of axis centers. An inner surface of the groove of each of the screws includes a first surface, which faces in the first direction, and in which the outer circumferential surfaces of the screws are formed to coincide with each other without a gap therebetween in the state where the screws mesh with each other, and a second surface, which faces in a second direction opposite to the first direction, and which forms a gap between the outer circumferential surfaces of the screws in the state where the screws mesh with each other.

Screw pair and co-rotating intermeshing twin-screw extruder provided with screw pair

A method of treating a polymer compound has the steps of: mixing and agitating the polymer compound and a chemical agent in an extruder while controlling the inside of the extruder to be kept at a high temperature and a high pressure to have a reaction mixture containing a polymer treated product; supplying the reaction mixture continuously into a high-pressure container disposed following the extruder and retaining the reaction mixture at the high temperature and high pressure for a predetermined time; then supplying the reaction mixture continuously to a chemical agent separator to separate the polymer treated product; and supplying the separated polymer treated product continuously to a molding means to form it into a molded material.

Method of treating polymer compound and treatment system for the same

An object of the present invention is to continuously feed an object to be treated to a high-pressure reactor which treats the object to be treated containing 10 mass % or more of water under high pressure, while preventing backflow of a high-pressure atmosphere from the high-pressure reactor. This is embodied by making a configuration such that the object to be treated is fed to the high-pressure reactor connected to a discharge port of a screw feeder which is provided with a feed unit for the object to be treated and the discharge port on one end side and the other end side respectively and forms a high-pressure atmosphere pressurized to, for example, 2 MPa or higher, while air-tightness between the high-pressure atmosphere and the one end side of the screw feeder is maintained by a sealing action of an accumulation compressed on the other end side of the screw feeder.

High-pressure treatment apparatus and method for operating high-pressure treatment apparatus

A kneading disk has a plurality of disk elements having flight tips arranged at a helix angle &#x3b8; in a direction supporting main streams of a resin. The flight tips of every two adjoining disks have a clearance formed therebetween. The resin is kneaded by undergoing dispersion and distribution without having any excessive temperature elevation in approximately three kinds of streams, i.e. its main streams flowing along the flight tips, its back streams through the clearances and its tip riding streams flowing over the flight tips.

Kneading disk apparatus

The object of the present invention resides in providing a method and instrument of polymer processing treatment, wherein a sudden pressure change due to expansion by gasification of a reactant when it is exhausted from a reacting extruder is given in a little amount to a molding machine for a treated substance, and a change in the amount of the material supplied to the molding machine and a variation in molding are little, and hence continuous and uniform molding is possible. That is, the method of the present invention resides in a method of polymer processing treatment, which includes the steps of: reacting a polymer with a reactant under mixing and stirring at a high temperature and a high pressure in the inside of a reacting extruder to produce the treated substance; introducing said treated substance and a remaining reactant into a reactant-separation tank to separate the treated substance and the reactant; and molding the separated treated substance.

Growing community of inventors

Hiroshima, Japan

Jun Kakizaki