Tablet coating is a critical step in pharmaceutical manufacturing that improves tablet appearance, masks unpleasant taste, enhances shelf-life, and enables controlled release. Choosing the right tablet coating machine ensures optimal efficiency, quality, and regulatory compliance.
In this article, we’ll explore four main types of coating machines for tablets, comparing their structure, working principles, and key advantages:
Whether you’re looking for a simple pill coating machine or an advanced high-capacity system, understanding each type is key to making the right choice.
2. Standard Coating Pan
2.1 Features
This is the most traditional tablet coating machine, consisting of a stainless-steel pan (8–60 inches in diameter) mounted at an angle. It rotates on a horizontal axis, driven by a motor, and is commonly used for sugar-coating and film coating.
2.2 Working Principle
Hot air is directed into the rotating pan and flows across the tablet bed, then exits through ducts at the front. The coating solution is applied either by ladling or spraying. Modern systems use atomizing spray guns for even distribution and faster drying, significantly reducing processing time.
3.Perforated Coating Pan
3.1 Features
This system uses a fully or partially perforated drum that rotates horizontally within a closed housing. It offers a significant upgrade in drying efficiency compared to traditional pans.
3.2 Working Principle
As the drum rotates, coating liquid is sprayed inside onto the tablets. Hot air flows through the perforations and across the tablet surface, ensuring fast and uniform drying.
3.3 Advantages
Faster drying times
Uniform coating coverage
Suitable for large-scale production
Widely used by modern tablet coating machine manufacturers
4. Fluidized Bed Coating Machine
4.1 Features
Also known as an air suspension coater, this machine is ideal for pellets and small particles. It features a vertical chamber where tablets are suspended in an upward flow of heated air.
4.2 Working Principle
Airflow is controlled to lift the tablets in the center and let them fall along the chamber walls. Coating liquid is sprayed continuously from the bottom, while hot air dries the product mid-air, ensuring a smooth, even coating.
4.3 Advantages
High drying efficiency
Ideal for controlled-release and film coatings
Minimal product loss and high uniformity
5. Centrifugal Granulating Coating Machine
5.1 Working Principle
This advanced coating machine for tablets uses a high-speed rotating turntable. Powder or masterbatch is fed into the machine, forming a spiral motion under centrifugal force and friction. Atomized adhesive is sprayed onto the moving powder, which gradually forms pellets through layer-by-layer buildup.
Hot air is introduced into the gap between the turntable and the outer cylinder to dry the material. After granules are formed, the coating liquid is applied in the same spiral motion and dried with hot air, resulting in smooth, spherical, uniformly coated pellets.
5.2 Advantages
Combines granulation and coating in a single process
Produces highly spherical pellets with excellent uniformity
Fast drying and smooth coating film
Ideal for taste-masking and sustained-release applications
Tablet Coating Machine Comparison Table
Type
Structure
Working Principle
Key Advantages
Standard Coating Pan
Tilted rotating pan
Tablets tumble in pan; sprayed and dried with hot air
Simple design, widely used, cost-effective
Perforated Coating Pan
Perforated horizontal drum
Spray + airflow through perforations
Fast drying, GMP compliant, good for high volumes
Fluidized Bed Coater
Vertical fluidization chamber
Tablets suspended in air, sprayed from below
Uniform coating, low waste, ideal for fine granules
Centrifugal Granulating Coater
High-speed rotating turntable
Spiral motion + spray + drying
Granulation + coating in one step, high sphericity
6. Conclusion
Each type of tablet coating machine offers unique advantages depending on the product type, batch size, and coating requirements. While standard pans are cost-effective and simple, perforated and fluidized bed coaters deliver faster, more uniform results. For complex formulations needing both granulation and coating, centrifugal coating machines offer a highly efficient solution.
Leading tablet coating machine manufacturers like Jianpai now provide a range of options to meet GMP standards and modern production needs. Choosing the right Jianpai pill coating machine can significantly improve productivity and product quality in pharmaceutical and nutraceutical industries.
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