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A water-based varnish solution tailored for PE double-coated paper in flexographic printing must prioritize sustainability, food safety compliance, and functional performance for cold drink cups and liquid packaging (e.g., milk/juice boxes). Below is a comprehensive technical outline:
1. Key Performance Requirements
Regulatory Compliance:
Meets FDA 21 CFR, EU 10/2011, REACH, and LFGB standards for food-contact materials.
Zero migration of harmful substances (e.g., phthalates, heavy metals).
Low VOC content (<50 g/L) to align with global eco-label certifications (e.g., EU Ecolabel, Nordic Swan).
Printing & Substrate Compatibility:
Optimized for flexographic presses with fast drying speeds (20–50 m/min) to support high-throughput production.
Strong adhesion to PE/PP non-porous surfaces (post-corona treatment: ≥38 dynes/cm).
Functional Properties:
Water and grease resistance: Prevents leakage and maintains integrity under refrigeration (0–5°C).
Scuff/abrasion resistance: Withstands handling and transport stresses.
High gloss finish (60° gloss ≥85) for premium aesthetics.
WangQin Chemical offers the packaging industry a wide range of packaging materials and solutions.
For different substrates, based on our proprietary products, we have developed a series of specialized solutions and production formulas. As specific cases require individual considerations, we have intentionally omitted the detailed proportions of components in the table below. Customers requiring customized solutions are welcome to promptly contact our sales team for further technical consultation and access to tailored formulations.
Water Based Varnish For PE double-coated paper (Flexography)- Cold drink cup or Milk/juice box
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No.
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Raw Materials
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①
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WQ-2090 (non-flm forming)
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②
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WQ-2028(better water resinstance) or WQ-109 solution
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③
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Deionized water
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④
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WQ-2015 (flm-forming)
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⑤*
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DOWSIL 51
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Dow Coming
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⑥
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Waterproof Wax Emulsion
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⑦
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Defomaer
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TEGO Foamex 825
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Remark:
1.The process of adding raw materials: ①+②+③, first add these three raw materials while stirring,then add④+⑤, finally add wax emulsion add defoamer while stirring +⑥+⑦, stirring time: about 30 minutes, 300 rpm/min.
2. *:DOWSIL™ 51 needed to be diluted with Ethanol=1:1
3.4# cup:25±5s
PH value 8.30±0.5
4. Final inks: varnish 50%+pigmknt paste 50%=100 (Ajusting it according to needs)
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