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What is a ribbon mixer?


What is a ribbon mixer?

Ribbon mixers are a basic industrial mixing tool. They consist, basically, of a trough-shaped casing (usually 2 to 3 times longer than it is wide) with a semicircular bottom, fitted with a horizontal longitudinal shaft on which are mounted arms supporting a combination of ribbon blades, paddles or helical screws set at a fairly close clearance to the semicircular mixer body so that no layer of material remains on the bottom of the mixer. The most effective design of ribbon layout is the double spiral in which the outer ribbon moves the product in one direction and the inner ribbon moves it in the opposite direction. This creates axial flow and prevents any buildup of material moved by the blades as they rotate is relatively small so that mixing times can be long. The capacity of the mixer should not be exceeded otherwise the ribbon and/or blades are not effective and the surface layers of the powder do not get adequately mixed.

Ribbon mixers are normally operated at room temperature but they may be jacketed for steam heating (at atmospheric pressure)or water cooling, should this be called for .Although ribbon mixers are relatively standard in design there are many modifications and commercial design options available depending on:(a)materials characteristics;(b)production requirements, particularly batch size and working conditions; (c)machine characteristic such as loading and unloading facilities.

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