News
-
2019-10-22
Water-based Ink Printing Conditions
The printing suitability of water-based inks is affected by the objective conditions such as printing conditions, surface characteristics of the substrate, ambient temperature and humidity, and storage time. Therefore, some additives are needed to finely adjust the ink to obtain the best printing effect. . The commonly used additives in water-based inks are color materials, pH stabilizers, slow-drying agents, defoamers, thinners, etc., and the characteristics and methods of use of the additives should be familiar with the printing.
1) The colorant is used to deepen the color, and its dosage should generally be controlled at 0 to 30%. If it exceeds 30%, the content of the binder in the ink will be too low, resulting in a decrease in adhesion and wear resistance.
2) The pH stabilizer is used to adjust and control the pH of the aqueous ink to stabilize it at 8.0 to 9.5 to ensure the printing state of the aqueous ink. At the same time, it can also adjust the viscosity of the aqueous ink and dilute the ink.
3) The slow drying agent is used to reduce the drying degree of the ink. The slow drying agent can suppress and slow the drying speed of the water-based ink, prevent the ink from drying on the printing plate, and reduce the occurrence of printing failures such as blocking and paste. The amount of slow-drying agent should generally be controlled to 0~10% of the total ink. If the amount is too much, the ink will not dry thoroughly, and the printed matter will be dirty or odor.
4) Aqueous ink thinner is mainly used to reduce the depth of color, and the amount is not limited. However, the addition of a large amount of thinner may cause a slight increase in the viscosity of the ink, and a small amount of diluent may be added at the same time for adjustment.
5) The dilution is mainly used to reduce the viscosity of the ink. The dosage should be controlled within 3%, so as not to reduce the color depth of the ink, and keep the pH value of the ink unchanged. The diluent should be added slowly while stirring to prevent the viscosity from being too low. If more diluent is added or diluted with tap water with high hardness, bubbles will be generated, and an antifoaming agent should be added.
6) The main reason for the foaming problem in the use of water-based inks is that water is used as a diluent. When the emulsion is polymerized, a certain amount of emulsifier must be used to greatly reduce the surface tension of the emulsion system. -
2019-10-21
Water-based Ink Production Process
Grinding color paste: mixing water-soluble resin, pigment, auxiliary agent, solvent (water), etc., stirring and dispersing by a high-speed disperser, and grinding into a standby color paste.
Formulating the ink: mixing and mixing the alternate color paste, auxiliary agent and solvent (water), and dispersing it by grinding to make it have sufficient fineness, luster and coloring power, and the filter package is an aqueous ink product.
In summary, we have selected various types and varieties of water-soluble acrylic resin, through the comparative test screening of pigments and additives, and compounding with acrylate emulsion, adding cross-linking agent, through orthogonal test preferred formula, The water-based ink products developed by the company have been tested and used by relevant units, which prove that their indicators have reached the advanced level of similar products at home and abroad, and have been well received by the users.
Main Specifications:
1 color: similar to the standard version (Note: compare the sample and the standard sample with the manual color wheel color contrast);
2 fineness: less than 20um, instrument: 0 ~ 50um scraper fineness meter;
3 Viscosity: 20±5s, instrument: RIGOSHA4# cup (25°C);
4 PH value: 8.0 ~ 9.5 instrument: portable PH meter (PHB-2 type);
5 heavy metal content: in line with the world packaging green environmental standards;
6 tolerance: meet the requirements. -
2019-09-11
Classification Of Water-based Inks
Classification of inks Modern inks are mainly divided into four categories according to the type:
1. Letterpress ink
A type of ink used to print books, newspapers, albums, documents, books, etc. The main feature of letterpress printing is that the inking portion of the printing plate protrudes from the non-inking portion. The letterpress ink is divided into a printing ink, a copper ink, a letterpress rotary ink, and a flexible letterpress ink according to the type of the printing machine and the use of the printing product.
2. lithographic ink
A class of inks suitable for lithography. Each part of the lithographic layout is basically in a plane, the pattern is oleophilic, the non-pattern is hydrophilic, and the printing is performed by the principle of oil and water repelling, so the lithographic ink must have water resistance. According to the process, it is divided into offset printing ink, web offset printing ink, flat offset printing ink, waterless offset printing ink, printing iron ink, lithographic ink, and printing ink.
3. Gravure ink
A type of ink suitable for gravure printing. The ink is recessed on the pattern portion of the layout during printing, and the ink of the non-pattern portion is wiped or scraped, and then printed. There are engraved gravure inks and gravure inks.
4. Mesh ink
A type of ink that prints through a mesh of a printing plate onto a printing surface. The mesh printing ink is further divided into a writing ink and a screen printing ink.