What factors will affect the glossiness of the water-based varnish?

   With people's increasingly stringent aesthetic requirements for packaging and

the development of the market, printing factories have higher and higher

performance requirements for water-based varnishes. Water-based varnishes have

become an indispensable and important member of the printing and packaging

industry. It has become a common problem in the printing and packaging industry

that the glossiness of water-based varnish after glazing cannot achieve the desired

effect. So what factors will affect the gloss of water-based varnish?

   Leveling of water-based varnish Varnish viscosity, pH value and surface tension may

affect the leveling of water-based varnish. Water-based varnish with good leveling

property can achieve rapid leveling effect before the coating dries, improve the

smoothness of the surface, and then significantly improve the gloss of the coating after

glazing; if the water-based varnish cannot If it is dried before leveling, there will be streaks,

blisters and other phenomena, which will affect the gloss of the printed matter.

The key factors affecting the leveling property are the leveling viscosity and drying speed of

the varnish during the leveling process. The leveling viscosity remains low and the coating

levels out faster. The lower the drying rate, the better the leveling of the coating. The ratio of

emulsion and water-soluble resin The glossiness of water-based varnish also has a certain

relationship with the ratio of emulsion and water-soluble resin. Increasing the amount of

emulsion is directly proportional to the gloss, although it can improve the gloss,

but the leveling and processing suitability are reduced; increasing the amount of water-soluble

resin is inversely proportional to the gloss, although it can improve the leveling and

processing suitability of the varnish. resistance, but its gloss will be reduced.

   The surface tension of the varnish is an important factor affecting the overall quality and

gloss of the varnish. If the surface tension value of the water-based varnish is too small,

the water-based varnish can easily wet the surface of the printed matter, and under

the action of the surface tension, it will easily level off into a smooth and uniform film surface;

if the surface tension of the varnish is large , then it is difficult to wet the ink film on the

surface of the printed matter, and it is not easy to form a uniform coating layer; when its value

is greater than the surface tension value of the ink film of the printed matter, the varnish coating

after coating will shrink to a certain extent, There may even be phenomena such as trachoma.

The viscosity of varnish is due to the surface of the printed matter has a certain absorption of

varnish, and the absorption rate of varnish is proportional to the viscosity value of varnish,

so the viscosity of water-based varnish has a great influence on the leveling and wettability of

the coating process. Coating suitability has a very important influence.