Ribbon Blender Design
Ribbon Blender Design & Operation
This article on Ribbon Blender Design details the design, construction and operation of Ribbon Blender commonly used for mixing of blending of free flowing powders. The industrial applications for which Ribbon Blender is used are listed.
Media : Free flowing powders, granules
Design and Operation
Mixing Vessel – The ribbon blender consists of a U-shaped horizontal trough containing a double helical ribbon agitator rotating within. The clearance between the external periphery of the ribbon and the internal wall of the mixing vessel is generally in the range of 3 mm. The clearance may be higher depending on the properties of the materials being blended.
Mixer Seal - The blender shaft is provided with an appropriate sealing arrangement in the area where it exits the mixing vessel.
Material Charging and Discharging - Material is loaded in the blender through the charging nozzles provided on the top lid. Discharge of material is generally through a centrally located bottom discharge valve. The blender may be provided with more than one valve, depending on the operational requirement.
Mixer Assembly - The blender assembly comprising of the mixing vessel and the drive system are mounted on a supporting structure, base frame. The height of the base frame is decided based on the required charging height and the discharge height required for the blender operation.
The rotation of the ribbon flights near the vessel wall cause the material to move towards the centre of the mixing vessel. The rotation of the inner flights directs the material in the opposite direction towards the vessel walls. The counter current, axial flow of materials, combined with the radial flow due to the action of inner and outer ribbon flights results in homogenous blending of the process material.
Video – Powder Blending in Ribbon Blender
Mixing Mechanism : Convection Blending
Homogeneity of Mix: 90 to 95%
Capacity: Ribbon blenders can be manufactured in a wide range of capacities. Blenders upto 10 m3 are common. The blender capacities can be as high to 50 m3.
The ribbon blender may be provided with an external jacket for heating or cooling the contents of the mixing vessel.
The ribbon blender can be provided with liquid spray arrangement for coating the powder materials.
- Easy loading and unloading of material.
- Easy to operate and maintain.
- Homogenous blending with low power consumption.
- Material discharge is limited to 95 – 97 %. This can lead to contamination issues during product change over.
Ribbon blender are commonly used for blending large volumes of free flowing, dry, solids materials in the food, pharmaceutical, cosmetic and chemical industries. The blender is capable of handling small quantities of liquids, used for coating or wetting of powders. The following are some of the applications of ribbon blender:
|Animal feed||Carbon graphite powder||Dry cement|
|Dry electrode powder||Epoxy resin||Gelatins|
|Grains||Heavy metal ore||Herbicides|
|Insecticides||Light paste material||Medicated feeds|
|Mica milk powders||Organic pigment||Pesticides|
Unique Mixers & Furnaces Pvt Ltd
Contact Person: Mr Jayesh R Tekchandaney
Phone – +91-22-25801214/25822385
Website – www.uniquemixer.com