TWIN-SCREW EXTRUDER, SPEED REDUCER AND EXTRUSION METHOD

• Main Authors: IZUMIYA KAZUTOSHI, KIMURA YOSHITAKA, OKUMA HIROYUKI, NAKAMARU TAKAHIRO, SUMITA KATSUMI, KANEKO KATSUYUKI, TANIMOTO MASASHI, UESHIGE SHIZUO, TANAKA NOBUAKI
• Format: Patent
• Language: English; Japanese
• Published: 22.08.2019
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; MAKING GRANULES OR PREFORMS; PERFORMING OPERATIONS; PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

To provide a twin-screw extruder in which a screw rotation speed can be changed according to a raw material processing step and a processed raw material is hardly deteriorated.SOLUTION: A twin-screw extruder according to the present invention comprises: a cylindrical upstream screw 31 having a shaft hole 315 extending in a longitudinal direction and having a screw flight on an outer peripheral surface; and a downstream screw 35 including a large diameter part 353 having a screw flight on an outer peripheral surface and small diameter shaft parts 351, 352 having a smaller diameter than the large diameter part 353. The small diameter shaft parts 351, 352 of the downstream screw 35 are inserted into the shaft hole 315 of the upstream screw 31. The upstream screw 31 and the downstream screw 35 are screws that can rotate independently of each other and are arranged parallel to each other. It further includes an upstream rotation mechanism that rotates each upstream screw 31 and a downstream rotation mechanism that rotates each downstream screw 35.SELECTED DRAWING: Figure 3 【課題】原料の処理工程に応じて、スクリュの回転速度が変更でき、かつ加工された原料の劣化がしにくい２軸押出機を提供する。【解決手段】本発明に係る２軸押出機は、長手方向に延びる軸穴３１５を有し、外周面にスクリュフライトを有する筒状の上流側スクリュ３１と、外周面にスクリュフライトを有する大径部分３５３及び大径部分３５３よりも小径の小径軸部３５１，３５２を含む下流側スクリュ３５と、からなり、下流側スクリュ３５の小径軸部３５１，３５２が上流側スクリュ３１の軸穴３１５に挿入されて構成されており、上流側スクリュ３１と下流側スクリュ３５とが互いに独立して回転可能であるスクリュを有し、２つのスクリュが互いに平行に並んで配置されており、各上流側スクリュ３１を回転させる上流側回転機構と、各下流側スクリュ３５を回転させる下流側回転機構と、をさらに有する。【選択図】図３