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What is printing ink? Ink is a homogeneous mixture of colored bodies (such as pigments, dyes, etc.), binders, fillers (fillers), and additives. It is an important material for packaging material printing, and is mostly used for various printing such as books and periodicals, packaging and so on. PAP Boxes teaches you 3 minutes to understand the process of printing ink for Luxury Eco Friendly factory gift box.


Pigments, binders and auxiliary additives constitute the basic components of printing inks.


Luxury Eco Friendly factory gift box If you want to have a good printing effect, you first need to understand the role of pigments. Physical properties such as particle size and surface of the pigment will greatly affect the dispersion process, but printing problems will occur if the degree of dispersion cannot reach a certain standard. The particle size of the pigment affects the strength of the color. The smaller the particle size of the pigment, the larger the specific surface area and the stronger the color. When the particle size is 0.5 micron or the specific surface area is 30 to 100 m2 / g, the pigment effect is good.

Varnishes are an integral part of pigments, helping to set into thin films and providing printability to inks. There are two main types of varnishes currently in use: oleoresin varnishes and non-oleoresin varnishes. The manufacturing temperature of oily varnishes is higher than that of non-oily varnishes.


Like varnish making

The varnish contains a dry oil that encounters oxygen in the atmosphere to cause polymerization. Therefore, varnishes are usually manufactured in closed pots. The oils and solvents in the varnishes are quickly dissolved or transesterified at high temperatures. In this process, the temperature will also be different, and the control range is between 120 ° C and 260 ° C. Temperature control is very important, so pay close attention to the temperature change rate during the production process. Use with condenser to prevent solvent loss.

In varnish production, dry oil, alkyd and other solvents must be added to the container under nitrogen before cooking. After a certain temperature, hard resin is added. The heating process continues until the reactants are completely consumed during the transesterification process or Until sufficient solubility is achieved in the solvent, additives such as chelating agents are added after the batch is cooled. Finally, the varnish mixture is reheated to obtain the target rheological properties, and the varnish is tested before being sent to the tank.


Production process

1. Make the binder, and add auxiliary additives to the pigment to mix and stir; after mixing, the pigment particles usually aggregate together to form a polymer

2, pigment dispersion; the raw materials mixed in the first step are ground through a grinder to uniformly disperse the pigment polymer to achieve the desired fineness.

3. The varnish is produced, and the pigments are mixed in. When the pigment particles are aggregated together, the agglomerates are broken by a pulverizer to uniformly disperse the pigment in the resin.


The above is the printing ink production process shared by gift box manufacturers.