Patent ID: 6220745
Filing Date: 2001-04-24
Classification: B29B,B29C

Abstract:
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, anda 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.