Device and monitoring system for removing liquid from high melting point resin by means of co-rotating twin screw extruder
AssigneeToshiba Machine Co., Ltd.
InventorsAkiyoshi Kobayashi, Junya Ishibashi
Life of this patent
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Abstract
A method of and device for removing a liquid from a resin of high melting point by means of a co-rotating twin extruder and an operation system of a liquid removal molding of a resin of high melting point by which a scaled down, highly effective, high performance and continuous stable operation of the device may be achieved.
Claims17
A liquid removing device for a water containing resin of high melting point by compressing the resin with a co-rotating twin extruder of a type in which a water containing resin material of high melting point is pressurized in a co-rotating twin screw for removing a water component for extrusion molding, wherein a vent portion is provided between a feeding section and an outlet of the resin material,
- a screw zone between the vent portion and the feeding section is formed into a melt-kneading screw for melting and/or kneading only but not for compressing,
- a heating means is associated with the screw to provide a melt-kneading section,
- said vent portion is providing an air opening vent and/or a vacuum vent for facilitating the vent functions,
- the melt-kneading section is comprised of a first screw zone of a flighted screw for efficiently conveying a resin material from the feeding section, a second screw zone of a kneading block for separating and evaporating a water component while melt-kneading the resin material, a third screw zone of a kneading block for stabilizing a melting condition of the resin material while inducing said separated water vapor and other volatile components into said vent portion, a fourth screw zone of a flighted screw for discharging said water vapor and other volatile components to the vent portion, and a fifth screw zone for sealing and comprised of a kneading block and/or a reverse flighted screw for discharging under the vacuum said water vapor and other volatile components which are finally left by discharge, and
- a screw zone between the vent portion and an outlet provides a compression screw zone of a flighted screw for mold-extruding the water free and a devolatilized resin material under the vacuum.
An operation monitoring system for liquid removal and molding of a resin of high melting point, wherein the water containing resin of high melting point is compressed in a co-rotating twin extruder for the extrusion molding,
- a vent portion is provided between a feeding section and an outlet of the extruder of said resin material,
- a screw zone between a vent portion and the feeding section is formed as a melt-kneading screw which serves only to melt and/or knead but not to compress the resin,
- a screw is provided with a heating means to form a melt-kneading section and that in said melt-kneading section from which the water component is separated and vaporized,
- a water vapor and other volatile components are induced into and discharged from the vent portion,
- a melt starting point of the resin material or a removal and vaporization starting point of water is transited by a fluctuation of water content of the resin material, and the transition is absorbed by a fluctuation of a predetermined temperature of a barrel to monitor a fluctuation of the predetermined temperature of the barrel of a buffer zone for operational stabilization and the fluctuation of the water content of the resin material is monitored to prevent a flake up phenomenon from said vent caused by a poor melting of the resin material.
Dependencies are inferred from the claim text.