Logo Bridging

As more coating is applied to tablet surfaces, the stresses that develop within the coating as it dries overcome the forces of attachment of the coating to the tablet surface, causing the coating to pull away within the logo or break line, making either less visible.

ISSUE CAUSES RECOMMENDATIONS
Tablet Core Tablet core ingredients do not promote good coating adhesion. Learn more
  • Increase levels of hydrophilic ingredients (such as microcrystalline cellulose, starch, copovidone or hydroxypropyl cellulose).
  • Optimize levels of lubricants such as magnesium stearate to minimize negative impact on coating adhesion, or replace magnesium stearate with other lubricants such as stearic acid or sodium stearyl fumarate.
Tablet core porosity is not sufficient to promote good adhesion. Learn more
  • Increase tablet core porosity by reducing compaction forces. (Note: Reduction should not be so much that tablet core robustness is compromised.)
Logo design is inadequate for a film-coated product.
  • Consult with tablet-punch manufacturers to ensure logo design is optimized for film-coated tablets.
Coating Formulation Coating formulation is not optimized for maximum adhesion. Learn more.
  • Consult with Ashland to select the most suitable Aquarius™ film coating system for application.
Coating Process Product temperatures are not sufficiently high to minimize stresses and/or promote increased adhesion. Learn more.
  • Increase inlet temperature and/or
  • Reduce spray rate.