Tapaporos CHP-27: Water-Based Flexographic Sealing Varnish for Porosity Control
The Tapaporos CHP-27 water-based flexographic varnish is a high-performance technical coating specifically formulated to close and uniform substrate porosity. Acting as an effective holdout layer, this pre-treatment regulates ink absorption on materials such as uncoated paper, recycled cardboard, and kraft, drastically improving printability and ink adhesion. Its application eliminates common issues associated with printing on porous substrates, such as mottle, chromatic tone variations, or loss of color density, ensuring a vibrant, sharp, and highly consistent color finish in demanding print runs.
Operational and Final Product Advantages
- Optimized printability: Provides greater ink anchorage and superior coverage, significantly reducing the mottle effect in solid printed areas.
- Process efficiency and savings: Allows for more controlled drying and notably reduces ink consumption by preventing over-absorption by the porous substrate, ensuring stability in long runs.
- More uniform and vibrant color: Achieves higher optical densities, complete color consistency, and excellent reproduction of fine details and texts.
- Absolute absorption control: Balances and seals the substrate's porosity, preventing bleeding, staining, and irregular penetration of subsequent inks.
- Sustainability and safety: Water-based formula with low VOC emissions, completely safe for operators, and offering excellent compatibility with standard flexographic lines.
Technical Specifications
| Parameter | Specification |
|---|---|
| Chemical Nature | Aqueous dispersion of sealing acrylic polymers |
| Main Function | Holdout layer / Porosity sealing |
| Application Systems | Flexographic or gravure varnishing unit |
| Compatible Substrates | All types of paper, uncoated paper, recycled cardboard, and kraft |
| Drying System | Hot air / Infrared (IR) |
| Recommended Applications | Paper/cardboard packaging, labels, editorial and promotional materials |
Logistics and Handling
- Packaging formats: Available in 25 kg pails, 200 kg drums, and 1000 kg IBC totes to optimize industrial supply.
- Storage conditions: Store in cool, dry, and well-ventilated areas, maintaining temperatures between 5°C and 30°C. Strictly protect from frost and direct sunlight exposure.
- Shelf life: 6 months from the date of manufacture when kept in its original, hermetically sealed container.
- Safety: Water-based product, non-flammable, and low odor. It is recommended to consult the Safety Data Sheet (SDS) for handling guidelines and the use of personal protective equipment.