{"id":12746,"date":"2026-05-16T01:29:50","date_gmt":"2026-05-16T01:29:50","guid":{"rendered":"https:\/\/pharmamachinecn.com\/?p=12746"},"modified":"2026-03-06T08:45:25","modified_gmt":"2026-03-06T08:45:25","slug":"types-of-spray-guns-for-tablet-coating","status":"publish","type":"post","link":"https:\/\/pharmamachinecn.com\/fr\/types-of-spray-guns-for-tablet-coating\/","title":{"rendered":"Types of Spray Guns for Tablet Coating"},"content":{"rendered":"
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Tablet coating is vital for the overall stability and efficacy of active pharmaceutical ingredients. One important component in this regard is a spray gun that provides uniform coverage to tablets and prevents defects during handling. Want to learn more about the types and designs of spray guns for tablet coating and what impacts their performance? Let’s start!<\/p>

\"Spray
Spray Gun For Tablet Coating<\/strong><\/em><\/figcaption><\/figure>

Types of Spray Guns for Tablet Coating<\/strong><\/h2>
\"Types
Types of Spray Guns For Tablet Coating.<\/strong><\/em><\/figcaption><\/figure>

The spray gun industry is growing and is expected to hit USD 6.05 billion by 2032.<\/u><\/a>\u00a0However, when you work in the pharmaceutical industry, you will come across different types of spray guns for tablet coatings, including air-atomized and airless options. Here’s an overview:<\/p>

Air-Atomized Spray Guns<\/strong><\/h3>
\"Air-Atomized
Air-Atomized Spray Gun.<\/strong><\/em><\/figcaption><\/figure>

Air-atomized spray guns use compressed air to break down a liquid coating suspension or solution into fine droplets. It moves over the tablets in a coating pan for even application. Once the coating is complete, hot air is introduced to dry the layer, creating a thick and uniform film that improves the tablet’s aesthetics.<\/p>

Air-Assisted Spray Guns<\/strong><\/h3>
\"Air-Assisted
Air-Assisted Spray Guns.<\/strong><\/em><\/figcaption><\/figure>

Another type of spray gun for tablet coating is the air-assisted type. In this, both liquid and compressed air are employed. However, the overall pressure is kept low compared to fully air-atomized spray guns. They work well with high viscosity coating solutions and tablets with a large surface area. What truly sets them apart is their improved transfer efficiency, which requires less solution, resulting in cost savings on coatings.<\/p>

Airless Spray Guns<\/strong><\/h3>
\"Airless
Airless Spray Gun.<\/strong><\/em><\/figcaption><\/figure>

Airless spray guns for tablet coating use high hydraulic pressure, typically between 1.7 and 20 MPa (250 and 3000 psig), to atomize the coating suspension. Rather than compressed air, the pressure creates a fine and smooth coating layer on the tablet. The overall spray rate and droplet size depend upon the orifice of the spray gun.<\/p>

Spray Gun Designs<\/strong><\/h2>
\"Coating
Coating Spray Gun Diagram.<\/strong><\/em><\/figcaption><\/figure>

Now that you are aware of the types of spray guns for coating tablets, let’s look at the various designs they are available in:<\/p>

Two Fluid Nozzles<\/strong><\/h3>

Two fluid nozzles, as the name implies, rely on two approaches, internal mixing and external mixing, which are distinguished by where the atomizing air and liquid combine to form the spray. Here’s an overview of both:<\/p>

  • Internal Mixing<\/strong>: The liquid and air combine and atomize inside the nozzle before it’s expelled in the form of a spray. This type of gun is suitable for a variety of fluids with different viscosities.<\/li>
  • External Mixing<\/strong>: External mixing is when the air and liquid meet outside the nozzle, providing more control over the coating droplet size and patterns on tablets.<\/li><\/ul>

    Anti-Bearding Nozzles<\/strong><\/h3>

    Traditional two-spray nozzles used in tablet coating spray guns are prone to buildup and material deposit on the exit orifice, leading to blocking. This phenomenon is known as bearding and reduces the overall spraying capability of the gun.<\/p>

    Therefore, manufacturers developed an anti-bearding nozzle with a distinct cap and nozzle orifice. The turbulence minimizes contact and keeps the coating gun free from shutdowns. You can coat maximum tablets with great accuracy within less time.<\/p>

    What Impacts the Performance of Spray Guns?<\/strong><\/h2>