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V- BLENDER

The V-Blender is a popular tumble blender commonly used in the pharmaceutical and food industries. V-Blenders are used for mixing, lubricating and blending in Pharmaceutical, Nutraceutical, Food, Chemical, cosmetics, ceramics, pesticide, plastics and other Allied industries. This article explains the design, construction, and operation of the standard V-Blender. ‘V’ Blender, the rotating shell V-Type Blender is used only as dry mixers and have no packing glands (seals) around shafts entering the chamber to eliminating problems of cross contamination.

CONSTRUCTION AND OPERATION

The V-Blender is made of two hollow cylindrical shells joined at an angle of 75° to 90°. The blender container is mounted on trunnions to allow it to tumble. As the V-blender tumbles, the material continuously splits and recombines, with the mixing occurring as the material free-falls randomly inside the vessel. The repetitive converging and diverging motion of material combined with increased frictional contact between the material and the vessel’s long, straight sides result in gentle yet homogenous blending.

The primary mechanism of blending in a V-Blender is diffusion. Diffusion blending is characterized by small scale random motion of solid particles. Blender movements increase the mobility of the individual particles and thus promote diffusive blending. Diffusion blending occurs where the particles are distributed over a freshly developed interface. In the absence of segregating effects, the diffusive blending will in time lead to a high degree of homogeneity. V-Blenders are therefore preferred when precise blend formulations are required. They are also well suited for applications where some ingredients may be as low as five percent of the total blend size. Normal blend times are typically in the range of 5 to 15 minutes depending on the properties of material to be blended.

The charging of material into the V-Blender is through either of the two ends or through the apex port. Studies on V-blenders have demonstrated that for solid powders which have similar size and shape, there is no mechanism to move the powders across the line of symmetry of the blender. For such materials, care must then be taken to load each side of the blender equally to ensure the desired homogeneity of blends.

Blending efficiency is affected by the volume of the material loaded into the blender. The recommended fill-up volume for the V-Blender is 50 to 60% of the total blender volume. For example, if the fill of material in the blender is increased from 50% of the total volume to 70% of the total volume, the time taken for homogenous blending may be doubled.

Salient Features:
  • Easy to clean.
  • Material of construction is SS 316.
  • Integrated Vacuum loading option available.
  • Intensifier bar can be provided for special applications.
  • Particle size reduction and attrition are minimized due to the absence of any moving blades. Hence it can be used for fragile materials.
  • The Bin charging system can also be incorporated in it which provides complete dust free closed environment for charging and discharging.
  • The shape of blender body results in a near complete discharge of product material, clearly an added advantage over horizontal blenders.
  • The absence of shaft projection eliminates product contamination.
  • V-blenders are easy to clean. Internal attachments like lump breakers and liquid dispensers widen the applications of this blender.
  • Capacity available from 5 -1200 L (Higher capacities upto 16000L also provided on demand).
Advantages and Disadvantages of V-Blender:

Advantages of Using V-Blender:

  • Particle size reduction and attrition are minimized due to the absence of any moving blades. Hence it can be used for fragile materials
  • Charging and discharging of material is easy.
  • The shape of blender body results in a near complete discharge of product material, clearly an added advantage over horizontal blenders.
  • The absence of shaft projection eliminates product contamination.
  • V-blenders are easy to clean.

Disadvantages of V-Blender:

  • They require high headroom for installation and operation.
  • They are not suited for blending particles of different sizes and densities which may segregate at the time of discharge.
Optional Features :
    • Charging Option :

 

      • Loading & Unloading by Product container with Jacking trolley.

    • Vacuum conveying system.
  • Interchangeable with different capacity ‘V” shape product container.
  • Rotary Intensifier with AC variable drive.
  • AC Frequency variable drive for product container.
  • PLC Controls with HMI touch screen,
  • Flame proof motor and Push Button station.
  • Inline milling and loading with vacuum transfer systems.
Safety Features :
  • Safety reeling with limit switch.
  • Overload protection and emergency stop.
Applications of V-Blenders:

V-Blenders designs are most often used for the dry blending of free flowing solids. This blender is often used for pharmaceuticals, but the mixing action’s slight shear limits the blender’s use for some very soft powders or granules. V-Blenders are generally used for the following:

  • Pharmaceuticals
  • Food products
  • Milk powder
  • Coffee
  • Dry flavors
  • Ceramics Powders
  • Pigments
  • Pesticides and Herbicides
  • Plastic powders
  • Animal feeds
  • Spice blends
  • Fertilizers
  • Baby foods
  • Cosmetics
  • Polyethylene