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▪ Pre mixing - refers to the mixing of modified materials (base materials, auxiliary materials, additives) in the pre mixing machine before the polymer mixing host (such as twin screw, continuous mixer, Booth kneading machine, three screw, etc.), and basically operating below the melting point of the base resin; ▪ Mixing - refers to the use of measuring scales (including weight loss scales, weight gain scales, solid volume pumps, etc.) above the main material inlet of the mixing host to achieve "mixing" of multi flavored materials in a small discharge well (or hopper), and to achieve "mixing" in the host; The latter obviously completes wetting, dispersion, extrusion, and granulation above the melting point of the base material.