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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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What are the commonly used ink additives

What are the commonly used ink additives

2023-08-28

Ink additives are auxiliary materials used to adjust ink to adapt to different printing conditions. There are many types of ink additives, and commonly used ones include adhesive remover, diluent, desiccant, slow drying agent, diluent, friction resistant agent, gloss oil, anti scratch agent, ink blending oil, etc. The following is a brief introduction to the functions and usage methods of common ink additives. 1. Spreading adhesive The adhesive remover has a small viscosity and is generally used for flat printing and relief printing ink to reduce its stickiness. In offset printing, due to changes in paper performance and printing conditions, such as high oil absorption, poor surface strength, and peeling of front and back coatings, excessive desiccant or low room temperature in the printing workshop can cause problems such as paper fuzzing, printing stacking, and pasting, affecting the quality of the printed product. Therefore, when the above phenomena occur, an appropriate amount of adhesive remover can be added to weaken and eliminate the above faults. 2. Withdrawal agent Diluting agent, also known as diluent, is a widely used additive in offset printing. There are two common diluents: one is transparent oil, used for glossy inks; One type is resin based fading agent, used for resin ink. If it is found that the ink color is too dark to restore the original during printing, an appropriate amount of diluent can be added to achieve the desired effect. 3. Desiccant Desiccants are one of the most important printing ink additives. The amount, type, and usage of desiccants vary depending on the printing conditions and paper used. There are two commonly used desiccants: red drying oil and white drying oil. The drying of red drying oil is from the outside to the inside, while the drying of white bath oil is done simultaneously with the outside. When printing, I choose the type of drying oil based on the drying requirements of the print and the ink color. The usual amount of drying oil is 2% -3%, and excessive use can actually cause a reversal of the base, leading to a decrease in drying speed. 4. Slow drying agent Anti drying agent, also known as antioxidant, is an ink additive that is opposite to drying agent. During the printing process, various reasons often cause downtime. When the downtime is long, the ink on it will dry and peel. To solve such problems, it is often necessary to add an appropriate amount of anti drying agent to the ink on the machine and run the machine a few times to prevent it from drying too quickly. 5. Diluent In printing, due to excessive ink viscosity or poor paper quality, problems such as paper fuzzing and plate dropping often occur, affecting the normal progress of printing. At this time, in addition to adding an appropriate amount of adhesive remover to reduce ink viscosity, a small amount of diluent can also be added to reduce ink viscosity, ensuring smooth printing. There are many types of diluents, usually low viscosity sixth grade inking oil. 6. Friction resistant agent Friction resistant agents, also known as smoothing agents, are mostly composed of waxes. When printing ink particles are coarse, such as white ink, gold and silver ink, an appropriate amount of friction resistant agents can be added to increase the friction resistance and smoothness of the printed material. 7. Masking oil High end prints such as trademarks and brochures often require surface gloss treatment to achieve a high gloss effect. When using gloss oil, the base can be mixed with ink before printing, or a layer of gloss oil can be added after printing. However, printed products that have undergone masking treatment will turn yellow after prolonged exposure, resulting in poor light resistance. Therefore, many new gloss oils that replace masking oils have been applied.

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