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Difference between revisions of "Ribbon Mixers"
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[[Category:Mixing]]{{Knoppen}} | [[Category:Mixing]]{{Knoppen}} | ||
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[[File:Ribbon-Blender-Logo.gif|thumb|right| Ribbon Mixer principle]] | [[File:Ribbon-Blender-Logo.gif|thumb|right| Ribbon Mixer principle]] | ||
[[File:Vertical-ribbon-mixer.jpg|thumb|right| A Vertical Ribbon Mixer]] | [[File:Vertical-ribbon-mixer.jpg|thumb|right| A Vertical Ribbon Mixer]] | ||
In a '''Ribbon Mixer''', a long complicated single paddle is mounted axially and used to disperse the ingredients of the mixture. The ribbon is usually so constructed that the powder near the outside of the container is moved in one direction, whereas in the middle it is moved in the opposite direction. Ribbon [[Mixers|mixer]] are available from several manufacturers and they all have their own type of ribbon. The reader should note that many of the companies mentioned with respect to a particular type of mixer in the discussion often make other type of mixers, as set out in their catalogs. | |||
In a '''Ribbon Mixer''', a long complicated single paddle is mounted axially and used to disperse the ingredients of the mixture. The ribbon is usually so constructed that the powder near the outside of the container is moved in one direction, whereas in the middle it is moved in the opposite direction. Ribbon [[Mixers|mixer]] are available from several manufacturers and they all have their own type of ribbon. The reader should note that many of the companies mentioned with respect to a | |||
==Industrial use== | ==Industrial use== | ||
Ribbon mixers are a basic industrial [[Mixers|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 a basic industrial [[Mixers|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. | ||
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Although ribbon mixers are relatively standard in design there are many modifications and commercial design options available depending on: | Although ribbon mixers are relatively standard in design there are many modifications and commercial design options available depending on: | ||
*materials characteristics | *materials characteristics | ||
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Sometimes, to improve the dispersion of ingredients in ribbon mixers, the ribbon blades are built to be close to the cylindrical wall to give high shearing. Sometimes the ribbons are also fitted with rubber wipers to ensure complete intermingling of the ingredients by lifting any packed material near the wall into the middle of the ribbon ensemble. It is difficult to predict the scale-up performance if one attempts to increase mixing captcity by going to a larger mixer of the same type. | Sometimes, to improve the dispersion of ingredients in ribbon mixers, the ribbon blades are built to be close to the cylindrical wall to give high shearing. Sometimes the ribbons are also fitted with rubber wipers to ensure complete intermingling of the ingredients by lifting any packed material near the wall into the middle of the ribbon ensemble. It is difficult to predict the scale-up performance if one attempts to increase mixing captcity by going to a larger mixer of the same type. | ||