Introduction
Continuous Inkjet (CIJ) printers are widely used in industrial coding for their speed and adaptability. A vital yet often overlooked component of CIJ systems is the ink solvent, or makeup fluid. These solvents play a critical role in maintaining proper ink viscosity, preventing nozzle clogs, and ensuring optimal print quality. However, they are also classified as hazardous chemicals, requiring strict safety protocols in handling and storage.
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1. What Is CIJ Solvent?
CIJ solvents, also referred to as “makeup fluids,” are volatile liquids added to the ink circuit to control viscosity and replace evaporated components. They do not contain pigments or dyes themselves but work in conjunction with the ink to maintain proper fluidity.
- Function: Thin the ink to the right viscosity for continuous flow through the printhead
- Volatility: High — designed to evaporate quickly to assist in rapid ink drying on substrates
- Base solvents: MEK (Methyl Ethyl Ketone), Acetone, Ethanol, Isopropanol, and blends
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2. Common Types of Solvents Used in CIJ Inks
1. MEK-Based Solvents
- Most common type in industrial CIJ printing
- Very fast drying time
- Effective on non-porous surfaces like glass, plastic, and metals
- Highly flammable and volatile
2. Ethanol-Based Solvents
- Less aggressive and less toxic compared to MEK
- Moderate drying time
- Better for environmentally sensitive or indoor applications
3. Acetone-Based Solvents
- High evaporation rate
- Common in applications requiring extremely fast-drying marks
- Can be more aggressive to plastics and printer internals
4. Mixed Solvents
- Custom blends for specific industrial needs (e.g., low-odor, food-grade, high-adhesion)
- Offer a balance between drying speed, safety, and print performance
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3. Functional Roles of Solvent in CIJ Printing
CIJ solvents serve several critical roles beyond just thinning the ink:
- Maintaining Ink Viscosity: Ensures the fluidity is ideal for uninterrupted droplet ejection
- Cleaning: Helps flush the nozzles and keep the ink circuit clean
- Stability: Prevents ink from gelling or forming deposits inside the printer
The printer’s internal software often automatically injects solvent based on temperature, humidity, and ink concentration readings.
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4. Solvent Handling and Safety Considerations
Because CIJ solvents are typically volatile and flammable, proper handling is essential for safety and compliance.
Hazard Classification
- Most CIJ solvents are classified as UN Class 3 flammable liquids
- Require MSDS (Material Safety Data Sheet) documentation and appropriate hazard labeling
Storage Guidelines
- Store in a cool, ventilated area
- Keep away from heat sources and direct sunlight
- Use fireproof cabinets for large volumes
- Seal containers tightly to minimize vapor emission
Personal Protective Equipment (PPE)
- Gloves (nitrile or chemical-resistant)
- Safety goggles
- Lab coat or protective apron
- Respirator when working in poorly ventilated spaces
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5. Transportation and Shipping Requirements
CIJ solvents fall under the category of hazardous goods for transportation. International shipments require:
- UN Number: For example, MEK is UN1193
- Packaging Group: Usually PG II or III
- MSDS: Must accompany the shipment
- Dangerous Goods Declaration (DGD): Required by airlines and maritime carriers
Only certified logistics providers should be used for transporting CIJ solvents.
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6. Tips for Solvent Efficiency
- Use solvent compatible with your ink and printer brand
- Replace filters regularly to prevent contamination
- Never mix different solvents or inks unless approved by the manufacturer
- Keep the printer lid closed to reduce evaporation
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Conclusion
Solvents are indispensable in CIJ ink systems, directly affecting print quality, equipment longevity, and operator safety. Choosing the right solvent and handling it correctly ensures optimal performance while meeting safety and regulatory standards.
At ChinaCIJInk.com, Cheef offers a full line of original and compatible CIJ solvents suitable for brands like Videojet, Domino, Linx, Markem-Imaje, and more. We provide complete MSDS documentation, shipping certifications, and technical guidance to support your industrial coding operations.
Need solvent recommendations or safety documents? Contact us at sales@cheef.cn or WhatsApp +86 181 6857 5767.
