Application of the hottest pearlescent pigment in

2022-08-18
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Application of pearlescent pigments in various printing methods

pearlescent pigments in printing inks can not only produce pearlescent effect, but also maintain the original color tone, and can bring a variety of metallic gloss effects and iridescence. Seals or combined pad gloss effects should be replaced in time. Pearlescent pigments have been widely used in the printing industry, commonly used in the printing of various packaging paper, magazines, advertising paintings, textiles and other items

overview of precautions for use

pearlescent pigments have excellent dispersing power. Generally, they can be mixed with low viscosity printing inks with only slight stirring. Due to the layered structure of pearlescent pigment, it can only be stirred slightly when mixing with ink to avoid rough mechanical treatment, so as to avoid damage to the surface of pearlescent powder. Usually, pearlescent pigments are added in the last process of ink production. When using dispersing machine and high-speed mixer, the mixing time of each batch of products must be consistent and the shortest, so as to avoid color difference between product batches. When the three roller machine has to be used, the roller gap should be adjusted as large as possible, and the mixing should be completed in the shortest possible time, so as to avoid the damage of the pigment structure affecting the gloss. Transparent materials shall be used as far as possible to avoid using opaque and scattered light additives to affect the pearlescent effect

the effect of ink, gloss and coating containing pearlescent pigment depends on whether the pigment is evenly distributed on the substrate. Only the pigment is arranged parallel to the surface of the substrate. The proper substrate can avoid the adverse effect of printing effect. The substrate with smooth and flat surface can make the pigment arrange smoothly and have the best gloss effect. In addition, the relationship between the number of plates and lines and the particle size of the pigment, the optimal viscosity of the ink, the printing speed, the drying conditions, the avoidance of pigment flocculation, and the dispersion of the ink are also very important. Pearlescent pigments have good scratch resistance, insulation and acid-base resistance

pearlescent pigments are used in flexographic printing

the printing plate used in flexographic printing is made of rubber or photosensitive resin, and the ink is transmitted through the embossing on the printing plate. Flexographic printing ink is a low viscosity liquid, which can be divided into solvent type and water type. It dries quickly, especially when radiation Yongxing new energy is solidified from a wholly-owned subsidiary of the company to a holding subsidiary. Because of its physical and chemical properties, pearlescent pigments can be used in most inks used in flexographic printing

traditional pigments have astigmatism, so they must be highly dispersed when mixed with pearlescent pigments and cannot exceed 3% of the weight of the ink. In water-based alkaline inks, alkaline additives should be used to adjust the surface properties of pearlescent pigments. If the viscosity is adjusted with alkaline thixotropic agent, the pigment with acidic surface must be adjusted to avoid pigment flocculation and abnormal viscosity changes

if you need to improve the dispersion of pearlescent pigments in the ink, you can pre wet and disperse the pigments before adding them to the ink. Choose the substrate with smooth and flat surface for the best effect. Calendering and embossing can increase the pearlescent effect

pearlescent pigments are used in offset printing

in offset printing, ink is transferred through flat printing plates. The printing plate has plane printing area and non printing area. Use the incompatibility of oil and water to color the printing area of the printing plate. At present, offset printing uses thin aluminum plates treated by UV exposure. In most cases, fountain solution is still used to separate printing and non printing areas

ordinary offset printing inks are high viscosity inks, which are not suitable for pearlescent pigments. Special printing inks should be used, and the ink manufacturer should adjust the ink composition according to the printing procedure

commonly used packages and labels can be printed with pearl pigment offset ink. The surface of the substrate shall be as smooth and flat as possible to optimize the pigment arrangement and obtain the ideal gloss effect, because the oil and ink layer in offset printing is very thin

pearlescent pigments are used in silk printing

while paying attention to the development of science and technology, printing ink is transferred from the silk plate to the substrate in silk printing. The frame of the platform screen printing plate is stretched with silk, which is used to transmit image information, and the ink is extruded through the rubber roller or scraper to the substrate. The material selection and manufacturing technology of silk play an important role in the printing effect. The thickness of ink transfer layer is determined by the fiber thickness of silk. When using pearlescent pigments, it is recommended to use single filaments to prevent the pigments from blocking the silk holes

the silk printing ink should have good application performance (adaptability, fluidity and good curing). The ink should not block the silk holes and dry rapidly after printing. Pearlescent pigments can be used in all silk printing ink systems, but are most suitable for transparent ink systems. If pearlescent pigments are pre wetted and dispersed, they will be better mixed with ink. The addition of pearlescent pigment in silk printing ink is generally% of the finished ink. In silk printing, because of the chemical resistance of pearlescent pigments, the post press processing process does not affect the pearlescent effect, so it is most used in textiles

pearlescent pigments are used in gravure printing

in gravure printing, printing results are obtained by transferring ink through the corrosion of the printing plate or the carved inking holes. Gravure printing mainly uses low viscosity liquid ink, which is prepared according to the substrate and post press processing. Pearlescent pigment is suitable for most solvent or water-based inks in gravure printing. Choose the connecting material with high transparency to avoid the damage of pearlescent effect. When preparing color inks, transparent pigments with good dispersion must be mixed with pearlescent pigments. Because pearlescent pigments have optical effect only in the ink layer with abundant light, the addition of pigments should generally be within 3% of the finished ink, and excessive hue will affect the pearlescent effect. Appropriate rheological additives should also be used to improve the surface properties of pearlescent pigments in inks. When applied to solvent based inks, it is recommended that the pigments be pre wetted and dispersed. Calendering and embossing can increase the pearlescent effect

source: Shanghai Dongdong Pearlescent Pigment Co., Ltd

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