Language
- Chinese

language

Tel

Tel

+8618142863185
Follow us

Official Accounts

Official Accounts
Top

News

Solutions for Common Issues with UV Inks

Release time:

2025-06-19 01:39

Solutions for Common Issues with UV Inks

UV inks have gained a prominent position in the printing industry thanks to their high efficiency and environmentally friendly characteristics. However, in practical applications, their unstable performance often poses challenges to print quality. This article will explore in depth, from multiple perspectives, the common issues encountered when using UV inks and their corresponding solutions, including problems such as viscosity instability, color variations, over- and under-curing, layering and emulsification, yellowing and deformation of substrate surfaces, and poor adhesion.

1. Unstable viscosity

Viscosity instability is one of the common problems encountered when using UV inks. In high-temperature environments, printed materials may exhibit blurring, ink flow, or color bleeding; while in low-temperature environments, the ink may become excessively viscous, leading to clogging or uneven printing.

Solution:

1. Control ink temperature: Use a constant-temperature device or temperature controller to monitor and adjust the ink’s temperature, avoiding the impact of extreme environmental conditions.

2. Use antioxidants: Add an appropriate amount of antioxidant to prevent the ink from deteriorating due to oxidation.

3. Regularly stir the ink: Use stirring equipment to regularly mix the ink and prevent layering and sedimentation.

4. Adjust the ink formulation: Optimize the resin and solvent content of the ink to enhance its stability and rheological properties.

II. Color Changes

Printed materials stored for extended periods may exhibit color fading or uneven coloring, particularly when exposed to direct sunlight or high-humidity environments.

Solution:

1. Select stable pigments and a light-curing system: Choose pigments with good light stability and thermal stability to ensure the stability of both the pigments used and the light-curing system.

2. Regularly monitor color consistency: Use a colorimeter or color chart to periodically check the color consistency of printed materials.

3. Avoid mixing inks from different batches: As much as possible, use inks from the same batch for printing to prevent color variations.

4. Control storage conditions: Store the ink in a cool, dry, and well-ventilated environment, avoiding direct sunlight and high-humidity conditions.

III. Over-curing and Under-curing

Over-curing manifests as abnormal gloss on the printed surface and cracking of the ink film; under-curing, on the other hand, results in a slight tackiness on the printed surface, making it easy for prints to stick together.

Over-curing solution:

1. Adjust the intensity and duration of UV light exposure: Properly regulate the power of the UV lamp and the exposure time to avoid excessive UV radiation.

2. Control the curing temperature: Appropriately lower the curing temperature to reduce intense chemical reactions.

3. Select an appropriate substrate: Choose a substrate that exhibits low sensitivity to ultraviolet light and minimal thermal expansion response.

4. Add a plasticizer: Add an appropriate amount of plasticizer to enhance the flexibility and durability of the ink film.

Insufficient curing solution:

1. Increase the intensity of UV light irradiation: Either increase the power of the UV lamp or adjust its distance from the substrate.

2. Extend the irradiation time: Reasonably extend the irradiation time to ensure thorough curing of the ink.

3. Use a curing accelerator: Add a certain amount of curing accelerator to speed up the drying and curing process of the ink.

4. Adjust the ink formulation: Optimize the content and type of photoinitiator in the ink to enhance its sensitivity to ultraviolet light.

IV. Layering and Emulsification Phenomena

Layering and emulsification not only detract from the overall aesthetic appeal of printed materials but can also lead to downtime and repairs for printing machines, thereby increasing production costs.

Solution to the layering phenomenon:

1. Stir thoroughly: Use a mixer to stir the ink thoroughly, ensuring that all components are evenly distributed.

2. Optimize the ink formulation: Select components with stable performance and resistance to separation, adjust the solvent ratio, and add a dispersant.

3. Storage condition control: Store the ink in an environment with appropriate temperature and humidity, and avoid direct sunlight.

Emulsification solution:

1. Control ink-water balance: Adjust parameters such as the concentration, pH value, and temperature of the dampening solution to maintain ink-water balance.

2. Optimize printing pressure: Adjust the pressure of the printing rollers according to the ink characteristics and the material of the substrate.

3. Select the appropriate ink: Understand the properties of inks, choose anti-emulsifying inks, and add emulsion inhibitors.

4. Strengthen the compatibility between ink and dampening solution: Conduct a compatibility test between the ink and the dampening solution before printing.

5. Yellowing and deformation of the printed material’s surface

Yellowing and deformation of the substrate surface can affect the aesthetic appeal and durability of printed materials.

Solution for yellowing on the surface of printed materials:

1. Select substrates that are insensitive to ultraviolet light: Thoroughly understand the chemical composition of the substrate and its tolerance to ultraviolet radiation.

2. Control curing conditions: Reasonably regulate the intensity and duration of ultraviolet radiation to avoid excessive UV exposure.

3. Add an antioxidant: Incorporate an appropriate amount of antioxidant into the ink to enhance the substrate’s resistance to oxidation.

Solutions for substrate deformation:

1. Select substrates with lower coefficients of thermal expansion: Give priority to materials with low coefficients of thermal expansion.

2. Optimize the curing process: Properly control the curing temperature and duration, avoiding excessively high temperatures and prolonged curing times.

3. Employ a pre-curing process: Pre-cure the substrate before formal curing to reduce deformation.

6. Poor adhesion

Poor adhesion can cause printed patterns to peel off or become blurred, seriously affecting the overall aesthetics and durability of the product.

Solution:

1. Select the appropriate ink: Choose an ink that matches the material and characteristics of the substrate.

2. Optimize the curing equipment: Ensure that the UV lamp’s linear power, penetration capability, and overall energy output meet the requirements for ink curing.

3. Perform surface treatment on the substrate: such as sanding, cleaning, and applying a primer to remove impurities like oil stains and dust, and appropriately increase the roughness of the substrate’s surface.

VII. Summary

In summary, the methods described above can effectively address various undesirable phenomena encountered in the use of UV inks, thereby enhancing print quality and meeting customers’ diverse needs. These measures not only improve the quality of printed materials but also reduce production costs and waste, providing strong support for the sustainable development of printing enterprises.

Bossin Related Product Recommendations
UV ink
Product Model	Product Features	Application areas
B-371 (Aliphatic Polyurethane Acrylate)	Fast curing, good surface drying, excellent flexibility, and good gloss retention.	Snowflake UV Ink, Wrinkle UV Ink
B-609 (Aliphatic Polyurethane Acrylate)	Fast curing speed, solvent resistance, scratch resistance, high hardness, and cost-effectiveness.	Plastic UV coatings, vacuum-plated UV topcoats, metallic UV coatings, PVC surface gloss coatings, UV coatings for polishing and hardening wood flooring and cabinet panels, UV inks
B-619W (Aliphatic Polyurethane Acrylate)	Fast curing, high hardness, good toughness, wear resistance, and chemical resistance.	Vacuum-plated UV topcoat, metal/plastic/wood UV coatings
B-912 (Aliphatic Polyurethane Acrylate)	Fast curing, high hardness, good toughness, chemical resistance, and wear resistance.	Vacuum-plated UV topcoat, metal/plastic/wood UV coatings
B-509B (Polyester Acrylate)	Good adhesion to a variety of substrates, excellent flexibility, and excellent pigment wetting properties.	Flexographic UV Ink
B-546 (Polyester Acrylate)	Good adhesion to metal/PET/PC, fast curing, and excellent flexibility.	UV transfer adhesive, UV disc adhesive
B-530 (Polyester Acrylate)	Fast curing rate, excellent pigment wetting, low viscosity, good hydrophobicity, excellent thixotropy, and improved ink misting.	UV offset ink
B-560 (Polyester Acrylate)	Fast curing, good pigment wetting.	UV offset ink
B-590 (Polyester Acrylate)	Good adhesion, fast curing, and excellent pigment wetting.	Screen-printing UV ink
B-590H (Polyester Acrylate)	Good adhesion, fast curing, and excellent pigment wetting.	Offset UV ink, screen-printing UV ink

Disclaimer: The above content is sourced from the internet and is for reference only. If any infringement occurs, please contact us, and we will remove it promptly.

Share to:

Requirements for the Physical Performance Indicators of UV Inks

Common Defects When Using UV Inks