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Ribbon Blenders consist of a U-shaped horizontal trough and a specially designed and fabricated Double Helical Ribbon Shaft rotating within. A ribbon agitator consists of a set of inner and outer helical ribbons. The outer ribbons move the material from the ends to the center while the inner ribbons move the material from the center to ends. This counter-current action causes good blending. The ribbons rotate at approximately 100 meters per minute and move the materials both radially and laterally to insure thorough blends in short cycle times. Ribbon agitators are used for blends that will be between 40% and 100% of the rated capacity of the blender.
An alternate agitator is the paddle design. The paddles are positioned to move materials in opposing lateral directions and radially. The paddle design is normally applied where friable materials are being blended and when batches as small as 25% of the total capacity are going to be mixed in one blender.