METHOD FOR PRODUCTION OF RUBBER COMPOSITION

PROBLEM TO BE SOLVED: To produce a rubber composition which enhances dispersibility of a compounding agent such as a filler in a material to be kneaded by applying uniform and large shearing force to the kneaded material in the process of kneading the material using a continuous kneader and facilitates a sheet molding work by preparing as a massive kneaded material.SOLUTION: There is provided a method for production of a rubber composition using a continuous kneader. The continuous kneader is equipped with: a barrel which has a main hopper port for feeding at least a rubber component and silica at an upstream side and has a discharge port for discharging a material to be kneaded including the rubber component and silica at a downstream side; and a screw rotatably supported to the barrel. The screw is configured by plural segments and comprises a kneading segment in which at least one kneading disc is disposed. The barrel is arranged at the same position as the kneading segment in a screw shaft direction, and is equipped with a pin member whose one end is fixed to a barrel inner wall and the other end protrudes into the cavity between the kneading discs.SELECTED DRAWING: Figure 1 【課題】連続式混練機を用いて被混練物を混練する際、被混練物に均一かつ大きなせん断力を与えることにより、被混練物中の充填剤などの配合剤の分散性を高め、塊状の被混練物として製造することにより、シート成形が容易なゴム組成物を製造すること。【解決手段】上流側に少なくともゴム成分およびシリカを供給するための主ホッパー口を有し、下流側にゴム成分およびシリカを含む被混練物を排出する排出口を有するバレルと、バレルに回転可能に支持されたスクリューとを備えた連続式混練機を用いたゴム組成物の製造方法。スクリューは、複数のセグメントで構成されており、少なくとも一つのニーディングディスクが配置されたニーディングセグメントを備えるものであり、バレルは、ニーディングセグメントとスクリュー軸方向同位置に配置され、一端がバレルの内壁に固定され、他端がニーディングディスク間の空隙に突出するピン部材を備える。【選択図】図１