Defects and remedies of the hottest ink or polish

2022-08-09
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Defects and remedies of inks or varnishes Part 4

2.4 bleeding and frosting:

a, fault phenomenon:

primer or full-scale graphic ink, in the substrate carrier, the penetration of pigments into the ink film and oil film leads to the change or blooming of surface inks or varnishes. We know that the precipitation of pigments that are prone to color bleeding on the surface of the graphic ink film of printing ink or the oil film of glazing oil is called frosting

b, cause:

the coloring substance on the surface of the substrate of plastic or aluminum foil or the coloring pigment in the primer layer is dissolved by the solvent of the ink on the surface and migrated to the ink film or oil film, resulting in bleeding and frosting. Usually, inorganic pigments do not have such problems. There are many problems with red or purple organic pigments. The compatibility of the primer ink or primer with the solvent in the surface ink system and the solvent resistance of the pigment should be taken into account

c. countermeasures:

when packaging the diversity of plastic or aluminum foil substrates, the following methods can be used: (1) in order to prevent color bleeding, the base oil with good sealing property or full version of white or yellow can be used to provide enough power color ink for zigzag reinforcement, and their solubility and leveling properties are good. For another example, alcohol soluble polyamide resin with polyvinyl butyral or Dama resin and silver powder, mica powder and other closed colors form one component closed white ink or varnish and two-component polyurethane ink and varnish; (2) When organic pigments are used, they should be resistant and fed back to the computer control system through the data collection card; The hydraulic system is the power system of the tensile testing machine. Pigments with good solvent, base oil, surface oil, ink color and structure color are as close as possible to the hue of pigments; (3) When the ink and varnish are full-scale printed or undercoated with one component thermoplastic ink or varnish, add a small amount of thermosetting resin binder to ensure the adhesion of the ink film after cooking. The solvent on the surface of the ink film should be compatible with the solvent with poor solubility; (4) When the full version white ink or yellow ink or the full version base oil is completely cured, the surface chromatic printing is carried out. When printing inside, the color of the chromatic printing is dry, and then the last layer of the foundation screw is installed to cover the bottom printing or the full version of the gloss oil to cover the light

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