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1. (WO2018221219) RUBBER EXTRUDER AND SCREW FOR SAME

Pub. No.:    WO/2018/221219    International Application No.:    PCT/JP2018/018897
Publication Date: Fri Dec 07 00:59:59 CET 2018 International Filing Date: Thu May 17 01:59:59 CEST 2018
IPC: B29C 47/60
B29C 47/76
B29K 21/00
Applicants: SUMITOMO RUBBER INDUSTRIES, LTD.
住友ゴム工業株式会社
NAKATA ENGINEERING CO., LTD.
中田エンヂニアリング株式会社
Inventors: TANAKA Tomoo
田中 智大
NAKAMURA Yoshinobu
中村 吉伸
SAKAMOTO Masayuki
坂本 雅之
SATO Tadasuke
佐藤 忠資
OTA Ryusuke
大田 隆介
TAKEUCHI Hideaki
竹内 秀明
MICHIBAYASHI Masaaki
道林 正明
NODA Makoto
野田 誠
Title: RUBBER EXTRUDER AND SCREW FOR SAME
Abstract:
Provided is a rubber extruder which can efficiently remove a volatile component in unvulcanized rubber without decreasing the productivity of the unvulcanized rubber. This rubber extruder for extruding unvulcanized rubber G while kneading the unvulcanized rubber includes: a barrel 2 having an input port 5 for inputting unvulcanized rubber G and a discharge port 6 for discharging the unvulcanized rubber G; a screw 3 which is disposed inside the barrel 2 and is for extruding the unvulcanized rubber G; and a vent 4 for suctioning air inside the barrel 2. The screw 3 has: a dam part 7 which locally restricts the extruded amount of unvulcanized tuber G; a first screw part 8 extending from the input port 5 to the dam part 7; and a second screw part 9 extending from the dam part 7 to the discharge port 6. The effective screw length L1 of the first screw part 8 is at least 50% of the total effective screw length L of the screw 3.