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When choosing flexible packaging printing ink, these four aspects should be noted

When choosing flexible packaging printing ink, these four aspects should be noted

2023-08-28

Flexible packaging refers to packaging in which the shape of the container can change after filling or removing the contents. Various bags, boxes, covers, envelopes, etc. made of paper, aluminum foil, fibers, plastic films, and their composites belong to flexible packaging. Substrate For different substrates, suitable ink should be selected. For example, ordinary ink can be used for printing BOPP films, polyurethane ink can be selected for printing NY/PET films, and it is best to choose aluminum foil specific ink when printing on aluminum foil as the substrate. The most basic condition for gravure printing is to allow the printing ink to adhere to the printing substrate, so the ink's wetting and polarity are important properties. In order to improve adhesion performance, it is also necessary to perform surface treatment on the printing substrate in advance (some inks are specifically suitable for substrate films treated with corona discharge). The adhesion of ink can have an impact on the processing and durability after printing, so it is important to pay close attention to it. The type of substrate is the most important factor in determining the type of ink used. Even for the same species, there are often differences due to differences in variety and grade. Therefore, it is necessary to investigate the following points in detail as much as possible: the type of printing substrate (material composition), manufacturer, thickness, presence or absence of electrostatic inhibitors and other additives, presence or absence of pre-treatment, treatment methods, printing surface, etc. Printing conditions The printing conditions include printing speed, drying device (capacity) and position, condition of the printing plate drum, printing color number and printing sequence, temperature and humidity in the printing workshop, function of the preheater cooler (roller), etc. These conditions can directly affect the transfer rate and drying speed of ink, so the ink selected for printing should be suitable for the printing conditions. The drying conditions include drying air temperature, air volume (wind speed), and drying device structure, which determine the drying efficiency. The speed of printing determines the length of drying time and the separation speed at the moment of ink transfer. The temperature, humidity, and preheating conditions in the printing workshop have a certain impact on the drying and layering of ink. The cooling roller must be able to cool the heat carried by the ink film when it leaves the outlet of the drying oven in a timely manner. In addition, for low-speed printing machines, the quality requirements for ink are relatively low. When using medium to high speed printing machines, it is necessary to choose medium to high grade ink. Some ink with poor quality has a lower transfer rate and is difficult to adapt to shallow versions. Printing quality requirements Color tone, brightness, and purity Transparency and covering ability Surface glossiness Hierarchical effect Overlay state Surface printing or back printing (inner printing) Is there any additional printing varnish available Other special quality requirements Ink produced by different manufacturers has different ink colors. There are differences in concentration, transparency, glossiness, and level expression, and the selected ink should meet the customer's requirements in terms of printing effect. When the printing effect is high, it is undoubtedly necessary to choose higher grade ink with targeted selection. After obtaining a standard sample with one ink for the first time, it is difficult to catch up with the standard sample with another ink. Due to the same reasons, the amount of ink used for plate making and sample making should be consistent with the actual printing ink used. Post press processing conditions Most plastic gravure printing products need to go through post-printing processing steps such as lamination, slitting, bag making, or hot stamping and polishing after printing to obtain the product. The processing conditions of this process must be judged to determine whether it is suitable for the performance of the ink, which is an important part of ensuring product quality. The compatibility with adhesives, composite strength, and heat resistance of heat sealing in composite processing are closely related to the type of ink (i.e. the resin in the binder), while the boiling resistance and distillation resistance of boiling sterilization are not only related to the type of ink, but also to the durability of the pigments used in the ink.

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What are the differences in the models of the Cai'en Cup and how to use the Cha'en Cup

What are the differences in the models of the Cai'en Cup and how to use the Cha'en Cup

2023-08-28

First cup: suitable for very thin liquids Second cup: thin oil, mixed paint, varnish Third cup: medium viscosity, mixed paint, varnish Cup number four: thicker fluids and mixtures Number 5 cup: A particularly viscous fluid and mixture. Usage of Cai En Cup: 1) The temperature of the liquid to be tested is 25 degrees Celsius, and during the testing process, it is necessary to ensure that the temperature fluctuation is minimal and cannot exceed+/-0.2 degrees Celsius. Adjust the temperature of the liquid to be tested if necessary. 2) Choose a viscosity cup with the appropriate aperture. Immerse the viscosity cup into the liquid to be tested, and the cup body must be completely immersed in the liquid. 3) Measure the temperature of the liquid in the viscosity cup using a thermometer and record it. 4) Remove the thermometer. 5) Lift the ring on the handle with your index finger to make the viscosity cup vertical. Quickly and steadily lift the viscosity cup, and start pressing the stopwatch when the viscosity cup leaves the liquid level. During the outflow process, the height of the viscosity cup should not be higher than 15 centimeters above the liquid level. 6) Stop timing when the first exact interruption of the beam is observed.

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What is the dyne value of ink

What is the dyne value of ink

2023-08-28

The dyne value comes from dyne. Dyne is the unit of force, 1 dyne=newton. The surface tension and dyne value we usually refer to are colloquial terms, but more accurately, they should be the surface tension coefficient. The definition is the pulling force between two adjacent parts of a liquid surface per unit length. The unit of surface tension in the SI system is Newton per meter (N/m), but it is still commonly used as dyne per centimeter (dyn/cm), where 1dyn/cm=1mN/m. In summary, the dyne value is actually a common term for dyne/centimeter, which expresses the magnitude of the surface tension coefficient. Surface energy, dyne value, and contact angle are all methods for evaluating the wetting performance of solid surfaces. Solids with higher surface free energy can be wetted better by water droplets on the solid surface, resulting in a smaller contact angle. Solids with lower surface free energy cannot be wetted well by water droplets on the solid surface, resulting in a larger contact angle The measurement of dyne value is most commonly used in printing, which can reflect whether the material is good for printing and what type of ink is suitable. Because the dyne value of the material is a certain value, the selected ink must be close to it and slightly smaller to achieve the best printing effect.

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How do we choose the appropriate printing ink

How do we choose the appropriate printing ink

2023-08-28

Any color is represented by three characteristics: hue, brightness, and saturation, so these three factors must be considered in the color matching process. Although theoretically black is the complete absorption of light, black ink still has a luster. Ink is made by grinding pigments (pigments) and resin binders. The particles of the pigment are wrapped in an almost transparent layer of resin oil, which has the ability to refract and reflect light. Therefore, we can feel that black ink printing still has a certain luster on the substrate. In the process of ink color matching, the ink used should be determined based on the actual printing process, ink layer thickness, printing substrate, and other conditions. When choosing ink, it is important to consider the gloss, hue, coloring power, and covering power of the ink itself. 1. Gloss can be measured by instruments or judged by the naked eye, usually only observed by the naked eye during the color matching process. Gloss actually refers to the degree to which ink printing samples have the ability to reflect light in the same direction after being exposed to light. It directly affects the appearance of printed materials and is a very important indicator. Meanwhile, when selecting ink, it is important to distinguish whether the ink itself is a glossy, semi glossy, or matte ink to avoid mixing errors. 2. Hue is the fundamental characteristic of color, used for qualitative differentiation. When color matching, the first thing to consider is whether the color is consistent. The detection method is usually to scrape the color with sample paper or simulate printing, and observe and compare the standard sample and the sample with human eyes. 3. Covering power is the degree to which ink covers its base color. The better the covering power, the worse the transparency. The level of transparency affects the efficiency of ink color matching and the degree to which it is affected by the printing substrate. 4. Coloring power is a method of indicating the concentration of ink. Its determination is a method of diluting and mixing a certain amount of ink with a certain amount of standard white ink, and then comparing it with the standard sample. The strength of color difference reflects the degree of color mixing of the ink and affects the thickness of the printing ink film. By conducting a color identification and scraping test on colored paper, the differences in gloss, hue, and covering power between the ink sample and the standard sample can be compared. Specific method: Place standard ink in the upper left corner of the identification paper and color matching ink in the upper right corner, with a distance of about one centimeter between the two. Use a scraper to flatten the thin application part with force at an angle almost perpendicular to the color paper, and quickly unfold the thick application part with light force at an inclined angle. After the surface of the ink dries, the ink color can be observed on the thin application part, the ink coverage and transparency can be evaluated on the black belt part, and the difference in gloss between the two can be judged on the thick application part, and the entire color appearance can be observed. Usually, black and colored ink use white scratch paper, while white ink uses black scratch paper.

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What is the difference between eco-friendly ink for children's book printing and regular ink

What is the difference between eco-friendly ink for children's book printing and regular ink

2023-08-28

The children's book market in China is becoming increasingly prosperous as parents pay more attention to reading.     At the same time, parents are also increasing their requirements for the printing and content of children's books, especially in terms of safety and environmental protection. Many publishing institutions have started labeling children's books with words such as "green printed publications" and "printed with soy ink".     How much do you know about professional children's book printing with environmentally friendly ink?     1. Rice bran ink     The rice bran ink technology originated from Japan, and currently many institutions and enterprises in China are conducting research on it. The development of rice bran oil extraction technology and the technological breakthrough of rice bran oil in ink not only maximize the value of rice bran, but also further improve the environmental protection and sustainable development of printing ink.     The main advantages of rice bran ink are: low residual volatile organic compounds (VOCs), low migration, and low environmental pollution; Rice bran resources are easy to localize, which is in line with China's national conditions; Rice bran ink has high glossiness, minimal residual harmful substances in printed products, and high safety.

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Analysis of the Development Trends of Future Ink Market

Analysis of the Development Trends of Future Ink Market

2023-08-28

Inkjet printing ink is a type of "liquid ink" that uses the electric field force between the nozzle of an inkjet printer and the substrate to spray a predetermined area on the surface of the substrate to form an imprint representing graphic and textual information. The future inkjet ink industry will present the following development trends.   1. High end professional inkjet inks will use more pigments as colorants Due to the large scale of pigment particle structure, whether it is the photodegradation caused by indoor light irradiation on the molecular structure of pigments, or the degree of oxidation and decomposition caused by outdoor sunlight and ozone in the air, pigments have advantages over dyes in terms of light resistance, gas resistance, water resistance, and image halo under high humidity. These characteristics also determine that pigment inks are more suitable for high-end professional users.      To achieve a wider color gamut, more ink colors have been developed, and HI-FI technology has been more fully utilized In theory, it is possible to mix various colors using the initial four colors "C, M, Y, K". However, the existing colorants have not yet reached the ideal level, resulting in slight differences between the actual color mix and the expected color. The best and simplest way to solve this problem is to increase the types of "color" ink. In addition, due to the fact that ink color matching is a subtractive color matching method, the more ink the inkjet printer sprays on the medium, the darker the color performance will be. Therefore, increasing ink color and using a single color to represent the previous stacked colors is the best coloring method.

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