Generally, the factory viscosity of water-based varnish is 35-60 seconds (25℃, coating -4 amount). When the factory uses water-based varnish, it needs to be diluted according to its own needs. The dilution method and ratio have a lot of influence on the performance of the varnish. Influence.

solution

When diluting water-based varnish, the more common way is to use a 1:1 mixed solution of alcohol and water for dilution. The proportion of alcohol is directly proportional to the drying speed. On the contrary, the proportion of water is inversely proportional to the drying time. The factory can adjust the proportion appropriately according to production needs.

The appropriate dilution ratio of varnish is 3%. If it is too diluted, the gloss and abrasion resistance of the water-based varnish will decrease.

In the case of high temperature and high humidity in the working environment, or in the case of wet-on-wet online varnishing and heavy ink, the water-based varnish is more likely to re-stick when it is varnished.

So how to solve the problem of back stickiness of water-based varnish?

①In order to speed up the drying speed of varnish, it is recommended to modulate the hot air and cold air to the highest grade to achieve the effect of quickly cooling the paper temperature;

②Because the overheating of the paper stack will cause the cross-linked and dried water-based varnish to soften and stick again, it is most appropriate to control the paper stack temperature at T≤35℃, and the highest temperature should not exceed 40℃;

③Using the smallest ink and water to achieve uniform printing under the state of ink and water balance, to ensure that the ink dries quickly. Qingshui Technology's water-based varnish has obvious performance advantages and helps maintain the state of ink and water balance. It is recommended to control the PH value of the water within the range of 4.8~5.3 to ensure the normal amount of alcohol added;

④Improve air extraction to avoid washing machine effect;

⑤Reduce the amount of glazing;

⑥ It is recommended to use water-soluble powder spray to prevent related problems caused by excessive powder spray;

⑦The hot and humid weather can easily lead to the phenomenon of sticking back. The paper receiving pile should not be stacked too high, and the plywood should be added frequently.