Troubleshooting

Peelings

• Erosion of core tablets, high friability and hygroscopic ingredients.
• If film coating formulation is poor.
• Tablets are too wet.

• Improve core strength, reduce friability, take care of hygroscopic ingredients.
• Use DLPL tablet coating material.
• Adjust temperature to a bit higher with regular spray rate.

Film cracking

• Excess heating of tablet core.
• Film coating with less mechanical strength.
• Plasticizer content in coating material is too low.

• Avoid high bed temperature.
• Use DLPL tablet coating material.
• Increase plasticizer concentration/use DLPL tablet coating material.

Picking & sticking

• Spray rate is high/uneven.
• Solid concentration is low.
• Drying air volume & temperature is low.
• Slow pan speed and inadequate load.

• Adjust spray rate.
• Use DLPL coating material.
• Adjust gun to bed distance, increase airflow and temperature.
• Apply proper loading & increase pan speed.

Orange Peel

• High spray rate.
• High solid concentration in coating material.
• Coating solution is too viscous.
• Too low air pressure.

• Decrease rate of spray.
• Use customised product from DLPL.
• Use low viscosity product from DLPL.
• Increase air pressure & optimise.

Twinning

• Tablet surface is flat.
• High spray rate.
• Low pan speed & air pressure.
• Spraying gun distance is not proper.

• Better to change tablet shape., if possible.
• Reduce spray rate.
• Increase pan speed & atomization air pressure.
• Set gun to bed distance properly.

Logo bridging

• Plasticizer content is too low.
• Low inlet temperature/air pressure.
• High spray rate.
• Coating with low adhesion.

• Use customised product from DLPL.
• Increase inlet temperature/air pressure.
• Reduce rate of spray.
• Choose high adhesion product from DLPL.

Surface erosion

• Tablet core friability is high
• Film strength is low
• High pan speed.
• Low spray rate.
• Hygroscopic ingredients
• Low solid concentration material.

• Optimise core friability.
• Use customised product from DLPL.
• Reduce pan speed.
• Increase rate of spray.
• Reduce hygroscopic material.
• Use customised product from DLPL.