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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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The requirements of different printing materials for ink

The requirements of different printing materials for ink

2023-08-28

1. Newspaper: The embossing ink used for newsprint printing is a type of ink that is very thin, low viscosity, and has good fluidity. Its fluidity depends on the speed of the printing machine. Its drying is completely absorption permeation drying. Nowadays, news printing has been replaced by rotary offset printing, and flexographic printing has also been used in news printing, where water-based ink has been extensively used. 2. Non coated paper: The quality of non coated paper varies, and the ink used must also meet the requirements of various types of paper. Usually printed with viscous ink, but thinner than the ink used for coated paper, the drying method is achieved through penetration absorption and oxidation of the film. 3. Cardboard: Cardboard is commonly used to make paper boxes, cardboard boxes, printed packaging, hardcover book covers, etc. In printing, ink requires good fluidity, low viscosity, and resistance to mechanical forces such as collisions and ink rubbing during transportation. Printing on cardboard can be done using all printing methods: embossing or offset printing with oxide film drying, gravure or flexographic printing with infiltration and evaporation drying. 4. Coated paper and surface treated paper: For embossing and single sheet offset printing, the ink thickness for printing on coated paper should be thicker than that on uncoated paper, the ink viscosity should be slightly higher, and the final drying of the ink is mainly achieved by oxidation film; When printing on coated paper using a rotary machine, it is required to use quick drying ink, and at the same time, oxidized film drying ink is gradually being replaced by thermosetting ink.

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