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Colloid Mills for Sale

What is a Colloid Mill?

In general, a colloid mill is a type of rotor-stator mixer often used in the manufacturing of emulsions and dispersions. A colloid mill is a machine used in the disintegration of solid particles or droplet size of a liquid present in suspension or emulsion. The machine consists of an inlet (which is subjected to a tremendous shearing action that effects a time dispersion of uniform size) and an outlet. Inside the colloid mill, a high-speed rotor pushes the fluid through small holes in a stationary stator, which creates extremely high levels of mechanical shear. The sizes of these holes or gaps is typically adjustable. This way the user can control the level of shear. The higher the shear, the smaller the resulting particle size.

For the most part, colloid mills work on the rotor-stator principle. The equipment breaks down materials by forming dispersion of materials in a liquid. Shearing takes place in a narrow gap between a static cone (the stator) and a rapidly rotating cone (the rotor). In order to reduce wear, the rotor and stator are constructed using toughened steel or corundum. The rotor of a colloid mill can differ from one machine to another. However, the operating principle is the same for all. Different manufacturers will incorporate specific features that result in changes in overall operating efficiency.

The final size of the product obtained after comminution is a function of the following steps:

  • Homogenization intensity and duration.
  • Viscosity of the continuous phase.
  • The shear force within the gap between the stationary stator and the spinning rotor.
  • Clearance rate between the rotor and the stator.

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Colloid mills are used in many manufacturing industries, especially in the pharmaceutical, food and chemical industries. These machines are great for making small to medium-sized batches of product. Colloid mills work well with highly viscous products. Some can even be used to grind fibrous materials, when fitted with a rough-surfaced rotor and stator. The If you are looking for a dependable, used colloid mill, then please reach out to us today. Get a quote for the colloid mill you need.

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When you reach out, we can help you select the type of colloid mill you need for your applications.

Common Colloid Mill Parts

Here are the general parts of a colloid mill.

  • Hopper
  • Cooling Water Pipe Joint
  • Auto-Circular Tube
  • Adapter Plate
  • Handle
  • Three-Port Wave
  • Discharge Port
  • Electromotor
  • Lifting Cover
  • Power Port
  • Base Support

Pharmaceutical Uses of a Colloid Mill

Here are four common uses of a colloid mill in the pharmaceutical industry.

  1. A colloid mill is most often used for the comminution of solids and for the preparation of suspensions. Especially for those suspensions containing solids that are not wetted by the dispersion medium.
  2. For increasing the stability of suspension and emulsion.
  3. Used in the formulation of colloidal dispersions, suspensions, emulsions, and ointment.
  4. For grinding, dispersing and homogenizing of ointment, cream, gels, and high viscous fluids in one operation.

Advantages & Disadvantages of Colloid Mills

Let's take a look at the common advantages and disadvantages of using colloid mills.

Advantages

  • Has a wide range of uses, which includes comminution of slurry- fluid materials.
  • Simple construction.
  • Offers high capacity with minimal requirements.
  • Fairly quiet during use.
  • Easily adjustable.
  • Does not need pressure for ionization.
  • Self-draining.
  • Easy to clean after each use.
  • Reduced wear as a result of the construction of the rotor-stator with toughened steel/corundum.

Disadvantages

  • Overall wear of the rotating plates.
  • Consumes energy though still dependent on some factors.
  • No wide application in solids.
  • No fine grinding ability.

Energy Consumption of a Colloid Mill

The energy consumption of a colloid mill depends on three factors:

  1. Feed rate.
  2. Viscosity of the product.
  3. Temperature during processing.

When you purchase a used colloid mill, it is important to make sure the energy consumption matches your needs.

How Does a Colloid Mill Compare to a Homogenizer?

A high-pressure homogenizer has a somewhat different mechanism of action than a colloid mill. It also uses more than just one force. Homogenizers drive the fluid at ultra-high pressure through a small nozzle, which causes cavitation. The fluid becomes a high velocity jet stream and flows through an absorption cell. This absorption cell contains alternating small and large orifices that create turbulence and cause fluid-on-fluid impact and shear. Process intensity is adjustable throughout the process. Actually, all of these forces are adjustable, which allows for great user customization and achieve their desired end result.