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Coating Pan with Hot Air System

High-Efficiency Pulverizing Pulse Dust Removal Production Line – Dry Material Grinding and Clean Processing Solution

model300-1000
Capacity200kg-2000kg/h
weight3t
size12100*2600*3000
Motor power4kw-30kw

What is a Coating Pan with Hot-Air System?

A coating pan with hot-air system is an integrated coating solution that combines a rotating coating pan (either perforated or non-perforated) with a controlled hot-air supply and exhaust system.
It is used to coat tablets, granules, or food items by spraying coating solutions and drying them simultaneously through a heated airflow.
This system ensures a uniform, smooth, and consistent coating layer, suitable for pharmaceuticals, nutraceuticals, confectionery, and certain industrial materials.

Core Components

Coating Pan / Drum
The circular metallic pan provides rotational motion for tumbling and mixing. Typical diameters range from 150–400 mm (lab scale) to 600–1200+ mm (production). The pan inclination angle is usually 30–45°, ensuring proper material movement.
Hot-Air System
Consists of a blower, heater (electric or steam), air ducts, distribution nozzles (air knives or perforated plates), and exhaust/filtration units. This system supplies heated, filtered air to dry the coating evenly.
Spraying System
Includes a precision dosing pump (peristaltic or gear), spray guns/nozzles (air-atomized or hydraulic), solution tank, and stainless-steel tubing for controlled atomization and delivery.
Control & Instrumentation
PLC or touchscreen controller to manage pan speed, airflow, temperature, and spray rate. Advanced systems store recipes, record process data, and trigger alarms for deviations.

Coating Pan with Hot Air System（images 2）

Working Principle

Loading – Tablets or granules are loaded into the pan.
Tumbling – The pan rotates, causing the product bed to tumble and expose all surfaces.
Spraying – The coating solution is atomized and sprayed onto the moving bed.
Hot-Air Drying – Heated air enters the pan, evaporating moisture or solvent from the coating.
Discharging – Once the desired weight gain and coating thickness are achieved, the product is unloaded.

Coating Pan with Hot Air System（images 3）

Typical Technical Parameters

Parameter	Range / Specification
Pan Diameter	150 mm – 1200+ mm
Pan Speed	4 – 30 rpm
Inlet Air Temperature	40 – 80 °C (typical for aqueous coatings)
Airflow Volume	200 – 1500 m³/h
Heating Power	0.5 – 10 kW
Spray Rate per Nozzle	10 – 300 ml/min
Main Motor Power	0.18 – 2.2 kW
Typical Batch Capacity	0.5 – 1000+ kg

Note: Actual parameters depend on coating type, batch size, and production scale.

Hot-Air System Design Highlights

Balanced Spray-to-Dry Ratio: The spray rate must not exceed the drying capacity to prevent sticking or rough surfaces.
Uniform Air Distribution: Air knives or perforated baffles improve drying uniformity and prevent localized overheating.
Safety for Solvent-Based Coatings: Explosion-proof blowers, solvent recovery units, and proper ventilation are required.
Temperature Control: Independent inlet and bed temperature sensors with PID control ensure thermal stability.
Exhaust Filtration: Dust and solvent vapors must be filtered or recovered to maintain environmental safety.

Typical Applications

Pharmaceutical Industry: Film coating, enteric coating, controlled-release, and taste masking.
Food & Confectionery: Sugar coating, chocolate polishing, flavor coating.
Nutraceuticals: Tablet or capsule surface finishing to improve appearance and swallowability.
Industrial Materials: Protective or functional coating of catalyst pellets and specialty granules.

Sample Model Specifications

Model	Pan Diameter	Main Motor	Heating Power	Spray Pump Type	Batch Capacity
LabPan-200	200 mm	0.18 kW	0.5 kW	Peristaltic (0–15 ml/min)	0.5–5 kg
ProPan-400	400 mm	0.55 kW	1.5 kW	Peristaltic (0–200 ml/min)	5–50 kg
ProdPan-800	800 mm	1.5 kW	4–8 kW	Gear (50–300 ml/min)	50–500 kg

Selection Guide

Product Characteristics – Consider tablet hardness, coating solution viscosity, and target weight gain.
Drying Capacity Matching – Ensure the hot-air system can evaporate moisture at the applied spray rate.
Safety & Compliance – For organic solvents, confirm explosion-proof certification and solvent recovery design.
Maintenance & Cleaning – Check for easy disassembly of nozzles, CIP capability, and quick cleaning features.
Scalability – Select a model that allows easy process scale-up from lab to production.

Common Troubleshooting

Problem	Possible Cause	Solution
Tablet Sticking	Spray rate too high or air too cold	Reduce spray rate, increase inlet air temp
Rough Surface	Over-drying or atomization too fine	Lower air temp, adjust atomizing pressure
Uneven Coating	Misaligned nozzles or inconsistent flow	Re-align spray guns, calibrate pump
Discoloration	Overheating or poor air distribution	Reduce temperature, improve airflow pattern

Summary

The Coating Pan with Hot-Air System combines precise spray control and efficient hot-air drying for high-quality coating performance.
A balanced integration of airflow, temperature, and spray dynamics ensures reproducibility and superior surface finish.
When selecting equipment, users should focus on coating formulation, drying capacity, safety, and scalability to achieve optimal process outcomes.

Disclaimer: The data and ranges presented are for general reference only. Actual design and operational parameters should be validated through process trials and supplier specifications.