Calendering Lubricant (Paper Supercalender Aid)
Calendering lubricants are applied to coated or uncoated paper webs prior to supercalendering or soft-nip calendering to improve gloss development, surface smoothness, and reduce friction between paper and calender roll surfaces. They prevent coating pick-off and surface damage during calendering, enabling production of high-gloss printing papers. These water-based formulations contain lubricating agents, softeners, and coating film-formers.
Technical Specifications
| pH | 7.0–9.0 |
| appearance | White to milky emulsion |
| solid content (%) | 20±3 |
| viscosity (mPa·s, 25°C) | 50–200 |
Applications
- Pre-calendering treatment for supercalendered (SC) papers
- Soft-nip calender gloss development for coated papers
- Machine-glazed (MG) paper surface treatment
- High-gloss packaging board calendering
- Specialty paper smoothness and gloss finishing
Key Features
- Enhances gloss development and smoothness in calendering
- Reduces friction and coating pick-off at calender nips
- Improves printability and ink holdout of finished paper
- Applied by spray or size press at controlled add-on levels
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