Mixing method and mixing system for rubber composition

Abstract

A mixing method and a mixing system for a rubber composition are provided with which unevenness in the temperature of a rubber mixture that is reached at the point of time when a carbon incorporation process is completed is reduced, thereby stabilizing the rubber properties. In each of steps of a carbon incorporation process and steps of a homogeneously dispersing process, at the point of time when the integrated quantity (S) of electric power required for rotating the mixing rotor(s) (2) has reached a predetermined integrated quantity of electric power, this step shifts to a next one. In the carbon incorporation process, the ram pressure (Pr) and / or the number of revolutions (N) of the mixing rotor(s) (2) is subjected to PID control on the basis of the difference between the temperature-rising rate of the rubber mixture (R) and a predetermined value thereof, thereby regulating the temperature of the rubber mixture (R) that is reached at the time of process completion to a value within an acceptable range. In each step of the homogeneously dispersing process, the ram pressure (Pr) or the number of revolutions (N) of the mixing rotor(s) (2) is controlled so as to reduce the difference between a value based on successively detected data on a given subject to be controlled and a predetermined value thereof.

Description

technical field [0001] The present invention relates to a mixing method and mixing system for a rubber composition, and more particularly to a carbon incorporation process that uses an internal mixer to add carbon to raw rubber. At the end of the process, the attainment temperature of the rubber mixture can be reduced. The mixing method and mixing system of the rubber composition to stabilize the rubber physical properties of the manufactured rubber composition. Background technique [0002] Various mixing methods have been proposed for ensuring stable physical properties of rubber when raw material rubber and carbon are mixed using an internal mixer to produce a rubber composition (see, for example, Patent Document 1). In the mixing method described in Patent Document 1, emphasis is placed on a carbon doping process for doping carbon into the raw rubber and a uniform dispersion process for uniformly dispersing the doped carbon in the raw rubber. In the carbon doping proces...

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Problems solved by technology

Therefore, when the attained temperature of the rubber mixture varies greatly at the end of the carbon doping process, there will be a problem that the rubber properties of the rubber composition produced will become uneven, and there is still room for improvement.

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