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Tablet Coating Machine

November 24, 2021

Tablet coating machine is the mechanical device that apply an essentially dry, thin layer of coating material to the surface of tablet dosage forms in order to confer specific benefits over uncoated variety. It is an equipment that coats the outer surface of tablet with a thin layer of coating material:

· To mask the taste, odor, and color of the drug.

· To provide physical and chemical protection for the drug.

· To prevent decomposition of drugs sensitive to air (oxygen), light, or humidity.

· To minimize the unpleasant taste of certain drugs that may come during partial dissolution of the drug in buccal fluids during absorption.

· To improve swallowability and palatability by increasing surface smoothness in the mouth.

· To provide visual appeal and consistency, smooth surface texture, and uniform distribution of color.

· To serve as anticounterfeiting medium by incorporating tracer compounds in the coating material.

· To allow containment of highly potent compounds in the core of the tablet and, thus, avoid exposure to personnel handling of the tablets an essentially dry, outer layer of coating material is applied to the surface of a dosage form in order to confer specific benefits over uncoated variety.

This article focuses on the working principles of tablet coating machines, the various types of tablet coating machines, and advantages of tablet coating machines.

Working principles of tablet coating machines

The working principles of tablet coating machines are relatively simple. Tablet coating machines work by applying coating ingredients in the form of a solution to a group of tablets in a bed that may move horizontally or vertically. A concurrent flow of heated air facilitates evaporation of the solvents.

Types of tablet coating machines

Several companies have developed their own coating machines to accommodate their coating processes. The several types tablet coating machines currently available in the market are based on these three principle types.

  1. standard coating pan
    • Pellegrini pan
    • Immersion sword system
    • Immersion tube system
  1. Perforated coating pan
    • Accela-cota
    • Hi-coater systems
    • Driacoater
    • Glatt coater
  1. Fluidized bed or air suspension coater
    • High-pressure airless systems
    • Low-pressure air atomized systems