Belt Coater (Horizontal Chocolate Panning Machine)

Design and operating principles of the automatic belt coater

The coating cabin is designed for automatic application of chocolate, chocolate-flavored compounds, and other fat-based liquids onto rolling centers. Chocolate is applied by dripping or spraying, depending on center density and size, allowing both dense and lightweight products to be processed.

The chocolate pouring body can operate in dripping or spraying mode. Spray nozzles are typically used for lightweight centers such as puffed rice and cereals, while dripping is preferred for denser pieces. The dripping body, chocolate distribution components, and flexible hoses are equipped with PID-controlled heating elements to maintain stable processing temperature.

To protect the system during operation, the dripping body and chocolate pump are equipped with pressure transmitters that help prevent damage related to overpressure conditions.

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Advantages of belt-type chocolate panning technology

Traditional coating pans are widely used, but they rely heavily on operator skill and typically require manual discharge of coated centers. These factors can limit repeatability and increase handling time, especially when working with larger batches or frequent product changes.

The belt coater is designed to address these limitations. Automatic dosing, defined coating cycles, and PLC-controlled operation reduce operator dependency and support more consistent results between batches. Unloading is simplified by reversing the belt direction, eliminating the need for manual scraping or tilting of the vessel.

For producers seeking higher process stability, easier handling, and improved ergonomics compared to traditional pans, belt-type chocolate panning technology offers a practical alternative.

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How a belt coater works

A belt coater builds chocolate layers in defined coating cycles. Centers roll on the moving belt while chocolate is applied by dripping or spraying, followed by smoothing and setting steps using controlled air.

• Loading: Centers are loaded through the top opening onto the belt for batch processing.
• Chocolate application: Chocolate is applied by dripping for dense centers or by spraying for lightweight pieces such as puffed cereals.
• Smoothing: Heated air supports distribution of the coating, helping reduce tails and surface irregularities.
• Setting: Dehumidified cold air promotes controlled crystallization or solidification of the chocolate layer.
• Discharge: After the coating cycle is completed, the belt reverses direction to discharge the coated centers.

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What affects coating quality and repeatability

Consistent coating results depend on controlling a few variables. The belt coater supports this by automating dosing and timing, while auxiliary equipment stabilizes temperature and humidity.

• Chocolate temperature and viscosity: affects layer thickness, leveling and final mouthfeel.
• Air humidity and temperature: dehumidified air reduces sticking and improves setting stability.
• Drip vs spray selection: spray is preferred for lightweight centers; drip suits heavier pieces.
• Belt speed and batch fill level: influences rolling behavior, impact forces and breakage risk.
• Cycle design: number of layers, dosing per cycle and setting time define the shell build-up.

Auxiliary equipment

To accelerate the solidification of the chocolate layer, dehumidified cold air should be connected to the coating cabin's hood. We produce chiller and evaporator suitable to be used for the cooling purpose of the belt coater. A storage tank with a pump has to be connected to the dripping body of the chocolate coating machine.