Coating Process & Application Technology
Engineered process guidance for consistent film formation, optimized performance and reproducible coating outcomes across industrial production environments.
Industrial Coating Process Overview
Pharmaceutical film coating is a controlled process involving suspension preparation, atomized spray application, solvent evaporation and film consolidation under defined thermal and airflow conditions. Process reproducibility depends on controlled parameter alignment between formulation properties and equipment settings.
Care Pharma Chem coating systems are developed to ensure compatibility with conventional perforated pan coaters and fluid bed systems under validated process conditions. Our technical expertise ensures that every step of the application—from the initial dispersion to the final film consolidation—is optimized for maximum efficiency and product quality.
Standard Coating Workflow
1
Suspension Preparation
2
Equipment Charging
3
Atomized Spray Application
4
Drying & Film Formation
5
Cooling & Discharge
6
Quality Verification
Critical Process Parameters
Air Handling & Temperature Control
Inlet air temperature must support solvent evaporation without film defects
Exhaust air temperature monitoring ensures process stability
Relative humidity control reduces variability
Spray Parameters
Controlled spray rate aligned with drying capacity
Proper atomization pressure for uniform droplet distribution
Spray gun positioning for consistent coverage
Pan Speed & Mixing
Optimized pan speed ensures adequate tablet movement
Prevents over-wetting and localized agglomeration
Supports uniform film deposition
Weight Gain Control
Continuous monitoring during process
Target weight gain defines film thickness and performance
Controlled incremental application recommended
Suspension Preparation Protocol
Technical Notes
- Recommended filtration through 100–200 mesh
- Avoid excessive aeration during mixing
- Use prepared suspension within validated time window
- Monitor viscosity throughout the process
Water Charging
Charge approximately 60–70% of required purified water under continuous stirring.
Polymer Dispersion
Gradually add coating powder under high-shear mixing to prevent lump formation.
Controlled Mixing
Maintain defined agitation speed for 20–30 minutes to ensure homogeneity.
Final Adjustment
Adjust to final volume and verify viscosity before filtration.
Film Formation & Drying Mechanism
Upon atomized application, solvent evaporation initiates polymer particle coalescence and film consolidation. Controlled drying conditions ensure uniform polymer chain interaction and film integrity without cracking or blistering.
Proper balance between spray rate and drying capacity is critical to prevent defects such as picking, orange peel effect or twinning. Our systems are engineered to facilitate rapid coalescence even under moderate processing temperatures.
Equipment Compatibility
Care Pharma Chem coating systems are compatible with a wide range of industrial equipment. Performance optimization should be validated per equipment configuration and batch scale.
Perforated pan coaters
Conventional pan coaters
Fluid bed coaters (Wurster systems)
Common Process Considerations
01
Over-wetting due to high spray rate
02
Inadequate drying causing tackiness
03
Uneven film thickness from improper atomization
04
Surface roughness from low inlet temperature