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Methods for Determining Performance Indicators of UV Inks

Release time:

2025-06-18 07:36

Methods for Determining Performance Indicators of UV Inks
Methods for Determining Performance Indicators of UV Inks

With the growing awareness of environmental protection and continuous advancements in printing technology, UV inks—representing green printing materials—have found widespread application in various fields such as packaging, advertising, and publishing. The performance indicators of UV inks are directly linked to the quality and stability of printed products; therefore, it is particularly important to accurately measure these various performance indicators. This article integrates multiple studies on methods for determining UV ink performance indicators and systematically elaborates on the core performance indicators of UV inks as well as their corresponding measurement techniques.

I. Physical Performance Indicators

1. Color, hue

Using the side-by-side rubbing method, the test sample and the reference sample are rubbed onto standard paper to form thin, uniform ink films. Color differences are then visually inspected. This method is simple and intuitive, making it suitable for preliminary color assessment.

2. Fineness

The scraper fineness meter is used to determine the fineness and dispersion of ink particles, with results expressed in micrometers. This method allows for precise assessment of ink particle size, which significantly influences the printing performance of the ink.

3. Uniformity

Evaluate the uniformity of the ink by observing the overall effect of the printed material, checking for any spots, streaks, or uneven color distribution. This method directly reflects how the ink is distributed during the printing process.

4. Viscosity

The viscosity of ink is evaluated by measuring the rotational resistance of a rotor immersed in the ink using a rotary viscometer. This method allows for precise measurement of ink viscosity, which significantly influences the ink’s flow properties and printability.

5. Liquidity

The flow distance of the ink under specific conditions is observed, and the fluidity is expressed in terms of the diameter of the cylinder. This method provides an intuitive reflection of the ink’s flow properties and has a significant impact on ink transfer during the printing process.

6. Drying property

These include the visual inspection method, the friction test method, and the hardness test method. The drying performance of the ink is comprehensively evaluated by observing the glossiness and color changes on the ink surface, using fingers or cotton cloth to test for ink residue through friction, and employing a hardness tester to measure the surface hardness of the ink.

7. Glossiness

The measurement is performed using a photoelectric gloss meter, which determines the ratio of the amount of reflected light from the sample to that from a standard surface. This method allows for precise measurement of ink gloss and is used to evaluate ink quality and printing results.

8. Impact resistance

Test using a drop-ball test or an impact testing machine to observe the ink’s detachment or cracking under impact. This method can evaluate the ink’s stability when the printed material is subjected to external impact forces.

II. Chemical Performance Indicators

1. Adhesion

These include the grid-cut method and the tape test. In the grid-cut method, a blade is used to cut a grid pattern into the ink surface, and then adhesive tape is applied and pulled off to observe any ink flaking or detachment. The tape test involves directly applying a specific type of adhesive tape onto the printed surface and pulling it off to assess the adhesion strength between the ink and the substrate material.

2. Lightfastness

Use a xenon lamp aging test chamber or a UV aging test chamber to simulate outdoor lighting conditions and observe the fading of inks. This method allows for the evaluation of ink stability under prolonged exposure to light.

3. Heat resistance

Use a high-temperature oven to test the heat resistance of inks, observing phenomena such as melting, discoloration, or smoke formation under high temperatures. This method allows for the evaluation of ink stability in high-temperature environments.

4. Steam and boil resistance

Use a steaming and boiling test chamber to evaluate the steam-resistance of inks, observing changes in ink color and adhesion performance during the steaming and boiling process. This method can assess the stability of inks under humid and high-temperature conditions.

5. Solvent resistance, acid and alkali resistance, and oxidation resistance

Solvent resistance is assessed by performing a solvent-drip test to observe whether the ink swells, softens, or dissolves. Acid-alkali resistance is evaluated by immersing the ink in acid or alkaline solutions of specific concentrations and monitoring changes in color, brightness, and color difference. Oxidation resistance is assessed by simulating performance changes under oxidative environmental conditions. These methods collectively enable a comprehensive evaluation of the ink’s stability in various chemical environments.

III. Environmental Protection and Safety Performance Indicators

1. Content of harmful substances, content of heavy metals

Harmful substances in inks—such as heavy metals and volatile organic compounds (VOCs)—are detected using chemical analysis methods, including gas chromatography and atomic absorption spectroscopy. This method ensures that the inks meet environmental and safety standards.

2. Volatile Organic Compound (VOC) Content

The ink samples are subjected to preliminary treatment (such as heating to volatilize solvents), and then analyzed using a specialized VOC detector or gas chromatograph. This method allows for precise measurement of the VOC content in the ink, enabling an assessment of its environmental performance.

IV. Summary

In summary, the determination of performance indicators for UV inks is a complex process that involves multidisciplinary knowledge and requires the flexible application of modern analytical techniques and standardized testing methods. By rigorously measuring various performance indicators of UV inks, we can ensure that these inks maintain stable and high-quality output under diverse printing conditions, thereby driving the printing industry toward greater environmental friendliness, efficiency, and personalization.

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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

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