We achieved the innovation in internal mixer. The internal mixer is now equipped with effective energy saving capability and the internal filter to collect and mix powder material into the batch during mixing for material saving. In addition, we are developing dust sealing system reformation for much saving lubricator and advanced temperature sensing system for internal mixers.

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With the developments of enhanced performance/high quality of rubber products, the market begins the big shift to sophisticated kneader more than ever. It is essential that sophisticated kneader must have two functions, one is “dispersion function to fine, disperse precisely-mixed filler uniformly”, and the other is “heat removal property against shear heat”.
The shaft diameter of our WD type kneader is bigger than that of our conventional D type one, meanwhile the mixing chamber sizes are same. You will find that rubber compound is revolving together in annulus section (between the rotor shaft and round part of mixing chamber) . The revolving movement of rubber compound in this annulus section will have a great impact on “heat removal property” and “dispersion function”.

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Internal mixers have been dominant as rubber mixing equipments in technical rubber and tire industries for more than a century. Tangential and intermeshing rotors are two fundamental designs for internal mixers. In the recent decade, new materials and compounds have been developed such as silica/silane reinforced tire tread compounds in order to meet the global environment problems. The optimization of the distributive and dispersive mixing of various fillers in internal mixers should be required to improve the compound properties. Especially, the temperature control during mixing is becoming more and more important to control the reaction of chemicals and to reduce additional mixing stages for the production; therefore intermeshing mixers are area of interest in order to achieve the required properties for compounds. The paper describes various studies on the comparison of mixing characteristics between intermeshing and tangential mixers. The major advantage of intermeshing mixers is their higher cooling and mixing efficiency. Accordingly the intermeshing mixer with optimized state-of-the-art rotors has been developed in order to enhance the mixing performance.

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We developed high performance tangential rotors such as 4wing-h rotor, and have much experience in the field of tangential rotors in internal mixers. On the other hand, there is another type of mixers on the market, of which rotor has an intermeshing configuration. We have studied the effect of intermeshing rotors and developed the new intermeshing rotor. In this paper the mixing performance of this rotor that means good cooling effect, good Mooney viscosity reduction, good carbon dispersion, is described in the comparison for two types compounds, NR- and EPDM- carbon black compounds.

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