Shenzhen Buke Printing External Coating Process

Shenzhen Buke Printing External Coating Process

The ink (coating) used for printing on the outer layer of metal packaging containers is an outer coating, which aims to make the appearance of the container more beautiful and improve durability.

The base coating is a layer of connecting agent between the iron sheet and the ink, which ensures good adhesion between the white ink and the iron sheet and improves the adhesion of the ink.

The base coating mainly includes 350 amino alcohol acid baking paint with alcohol as the main solvent, as well as insulation paint such as 2. The solvent for the base coating should be 0 "varnish and 6" varnish. The base coating should have good affinity with ink or self coating;

Has good leveling properties, appropriate thermosetting properties, and flexibility; Light color; After drying and forming a film, it has little yellowing and good water resistance. White paint, commonly known as white magnetic oil, is commonly used for base color application,

Its function is to make the colored ink printed on it more vivid. Apply two or three coats to achieve the desired whiteness. To avoid yellowing of the white ink during baking, some color pigments can be added. White coatings mainly consist of titanium dioxide powder

Composed of resin and solvent. At the same time, it is required that after high-temperature baking, the pigment of the white ink does not turn yellow, and the softness and adhesion of the coating film do not decrease, which can be suitable for stamping processing in subsequent processes.

In addition, the coating should also maintain a certain level of viscosity and non volatility in metal printing. The coating roller is generally a synthetic rubber roller, and the surface hardness of the coating roller should also meet certain requirements.

The materials mainly include brain based rubber series, heterorubber series, polyurethane rubber series, and other materials. According to the solvent composition of the coating, silver should be selected as a material with certain physical properties such as lung lubrication, tensile strength, peel strength, and shape resistance.

Having a degreasing varnish can make the printed surface glossy and beautiful, protect the printed surface, and increase the coating's resistance to physical and chemical corrosion.

Shenzhen Buke Printing External Coating Process