Successful Project Achievements with Keylink Atmospheric Plasma before tampography, serigraphy and UV Printing on Plastic Bottles.
Plasma pretreatment has revolutionized the printing quality and efficiency on plastic bottles across tampography, serigraphy, and UV printing processes – which often struggle with poor ink adhesion due to the low surface energy of plastics like HDPE, PP, PET, and LDPE.
1. Enhanced Adhesion Strength for Diverse Inks/Coatings
- Plasma activation increases surface energy (measured via contact angle reduction) by up to 70%, enabling robust bonding with inks, UV varnishes, and functional coatings.
- Achievement: Raises surface energy from ~30 dyn/cm to 50–70 dyn/cm.
- Impact: Ensures better ink wetting and bonding on low-energy surfaces like HDPE or PP.
- Use Case: Improves adhesion on curved or irregular-shaped bottles where uniform treatment is critical.
2. Improved Print Adhesion & Durability
- Achievement: Enables strong, long-lasting adhesion for inks used in tampography, serigraphy, and UV printing.
- Impact: Prevents common defects like ink chipping, smearing, or peeling—even after handling or chemical exposure.
- Industry: Cosmetic bottles, personal care, food and beverage, and pharmaceuticals.
3. High-Speed Integration for Industrial Production
- Achievement: Plasma systems like the Keylink PL-50xx or PL-60xx series enable inline pretreatment at high speeds, seamlessly integrating with bottling lines. This eliminates bottlenecks in tampography/serigraphy printing workflows.
- Impact: Automated plasma units replace slow, manual processes (e.g., flame treatment or chemical primers), cutting pretreatment time by 50% and enabling just-in-time manufacturing.
- Eco Benefit: More environmentally friendly and workplace-safe process.
4. Versatility Across Plastics and Geometries
- Achievement: Keylink Atmospheric Pressure Plasma Jets (APPJ) conform to complex bottle curvatures, enabling uniform pretreatment for irregular shapes like necks or embossed logos. This is critical for screen printing intricate designs.
- Compatible with diverse plastics:
- Non-polar polymers (e.g., PP/PE): Activated via corona discharge or oxygen plasma.
- Coated surfaces: Bonds inks to UV-varnished or laminated bottles.
- Technology Fit: Rotating nozzles or multiple-axis plasma heads enable full 360° coverage.
5. Cost and Sustainability Benefits
- Achievement: Eliminates solvents/VOCs, reducing waste disposal costs and meeting eco-regulations (e.g., REACH). 30-50% lower operational costs can be achieved versus chemical primers.
- Impact ROI: A single plasma nozzle processes >100K bottles/day with minimal maintenance, paying back in the first few months.
6. Performance Metrics of Plasma Pre-Treatment
Parameter Corona Discharge APPJ Low-Pressure
Speed Moderate High Low (Batch-based)
Geometry Adapt. Limited Excellent Moderate
Eco-Footprint Low Very Low Moderate (Vacuum Energy)
7. Industry-Specific Avievements
- Beverage Labels: UV printing on PET bottles achieves scratch-resistant, high-gloss finishes after plasma treatment, reducing ink consumption by ca. 20%.
- Cosmetic Bottles: Screen-printed metallic effects on UV-coated acrylics show 0% delamination after plasma activation.
8. Common Plastics Successfully Treated
- HDPE: Widely used for detergent and shampoo bottles.
- PP: Used for caps and squeeze bottles.
- PET: For beverage and cosmetic packaging.
- LDPE: For soft, flexible bottles (e.g., lotions).
Plasma pretreatment transforms plastic bottle printing by merging precision, speed, and sustainability. Innovations like atmospheric plasma jet processes solve historical adhesion challenges while enabling next-gen applications (e.g., smart packaging). For implementation guidance, real-time evaluations using contact angle analyzers (e.g. ,Keylink CA01/CA02) are recommended.
Please contact Keylink Technology if you would like assistance in selecting a plasma system based on your application, as well as for plasma integration into an existing Printing Mass Production.
