introductory:
In packaging, publishing, commercial printing, and more, the visual effect of printed matter is crucial. High-gloss offset printing ink can give the printed matter a mirror-like glossy texture, enhance the color vividness and image clarity, enhance the attractiveness and grade of the product, and meet the market demand for high-quality prints.
1. Ink characteristics
High gloss
Using special resin and fine pigment, after curing, it forms a smooth and smooth ink film, with high light reflectivity, and the gloss can reach more than 80% (according to different standards and test conditions).
Excellent color performance
The selection of high-quality pigments, high color saturation, accurate hue, wide color gamut, can accurately restore color, to meet the needs of spot color printing and high-precision image printing.
Good printability
With suitable viscosity and fluidity, easy to transfer and evenly distributed in the printing process, and have good affinity with different printing materials to ensure stable printing quality.
Drying performance
By optimizing the formulation, rapid oxidative polymerization drying or instant curing with the help of UV curing technology can be realized, improving production efficiency and reducing quality problems in the printing drying process.
2. Application scenarios
High-end packaging and printing
Such as cosmetics, luxury goods, electronic products and other packaging boxes, to enhance the appearance of products and brand image.
Fine album printing
Art albums, photo albums, etc., realistically present the details and colors of the picture, bringing visual enjoyment to readers.
Commercial advertising printing
Posters, leaflets, tags, etc., to attract consumers' attention and enhance the effect of advertising.
3. Ink selection
According to the printing material
Paper, the surface of coated paper is smooth, and it is suitable for the display effect of high-gloss ink; Inks that are adaptable to paper can be selected for whiteboard paper. Plastic films, such as PET and PP films, need to be used with special plastic high-gloss offset inks to ensure adhesion.
Combined with printing process
Ordinary lithographic offset printing, choose conventional high-gloss offset printing ink; Waterless offset printing, using waterless high-gloss offset printing ink to avoid the influence of moisture on ink performance.
Consider the drying method
Oxidative polymerization drying ink, suitable for conventional printing speed and production environment; UV-curable high-gloss inks for high-speed printing and where drying time is critical.
4. Pre-printing preparation
Equipment cleaning and debugging
Thoroughly clean the ink fountain, ink roller, blanket and other parts of the printing press to avoid impurities affecting ink transfer and gloss effect. Debug the printing pressure and ink balance to ensure the uniform transfer of ink and the stable printing quality.
Ink preparation
According to the requirements of the printing order, accurately adjust the ink color. Use ink stirring equipment to fully stir to ensure that the pigments and additives are evenly dispersed, and avoid precipitation affecting the gloss and printing effect.
Printing material testing
Check the flatness, thickness uniformity, surface roughness, pH, etc. of the paper, and check the surface tension and thickness tolerance of the plastic film to ensure that the material meets the printing requirements and avoid poor ink adhesion and uneven gloss due to material problems.
5. Printing process control
Printing pressure control
Fine adjustment according to the thickness and hardness of the printed material to ensure that the ink is transferred evenly, and excessive pressure leads to the expansion of dots and the accumulation of ink to affect the gloss; If it is too small, it will not transfer enough and the luster will be dull.
Ink and water balance control
Strictly control the amount and concentration of dampening solution, too much dampening solution will emulsify the ink, the gloss will decrease, and the color will fade; Too little is easy to dirty version. Real-time monitoring of ink and water balance to ensure print quality.
Drying control
Oxidation and polymerization of drying inks, control the temperature and humidity of the printing workshop (temperature 15°C - 25°C, humidity 40% - 60%)), to ensure normal drying speed and gloss; UV curing ink, adjust the UV lamp power, irradiation time and distance to ensure that the ink is fully cured without affecting the gloss and performance.
6.Quality inspection
Gloss detection
Using a gloss meter, measured at different positions of the printed matter, compared with the standard value, the deviation is controlled within 60%.
Color detection
Measure the color data with a spectrophotometer, and control the ΔE value within 40 compared with the standard color sample to ensure color accuracy.
Printing quality inspection
Visual inspection or with the help of a magnifying glass to check the clarity and uniformity of the dots, whether there are defects such as ghosting, pasting, and missing printing. The adhesive tape test method is used to test the adhesion of the ink and ensure the quality of the printed matter.
7. Precautions
Operator protection
Wear protective gloves, masks, and goggles to avoid skin contact and inhalation of volatile gases. Maintain good ventilation in the workplace and reduce the concentration of harmful gases.
Ink use management
Follow the first-in, first-out principle, use in strict accordance with the shelf life, and use or properly dispose of expired ink after passing the test.
Environmental management
The printing workshop is kept clean and ink residues and waste are cleaned regularly. Ink-containing wastewater and waste gas are discharged after treatment to reduce environmental pollution.
8. Recommendation of the same type of products
Ordinary Economical Offset Ink