The Japan Steel Works, Ltd.

Yohei Shimizu

Jun Kakizaki

Kiyoshi Handa

Daigo Saga

Yoshihiko Iwamoto

Makoto Tojo

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.

An extruder () includes a cylinder () and a screw (), and one or more front vents () are provided on the cylinder () upstream of a hopper () and downstream of a rear vent (). The cylinder () is provided with, between the hopper () and the rear vent (), a liquid supply device () for spraying water into the cylinder () to cool an interior thereof and a liquid discharge port () that is opened in a lower portion of the cylinder ().

Extruder  provided with vents

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.

Growing community of inventors

Hiroshima, Japan

Yohei Shimizu