0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; useWater-based varnishShould I pay attention to? Let's find out.
0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 1. Control the drying temperature and time
0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; Common drying devices include hot air drying and infrared drying, generally considered infrared drying The effect is better. Since the main solvent of water-based glaze is water, the drying speed of water-based glaze is slower than that of ordinary glaze. Similarly, the drying temperature should be higher than that of ordinary varnish. It is generally recommended that the drying temperature of the water-based varnish is 80 ～ 100 ℃ and the drying tunnel length is about 2 m. If the temperature is not enough and the drying tunnel is too short, the coating film will not dry. In severe cases, sticking and rubbing will occur; but if the temperature is too high and the drying time is long, the paper fibers will lose too much water and the paper will change. Brittle, easy to break or burst during post-processing. One way to increase the drying speed is to increase the content of ethanol in the water-based glaze, but it cannot be adjusted at will according to the actual situation.

0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 2. Adjust the viscosity of water-based varnish
0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; In the coating process, the viscosity of the varnish needs to be reasonably controlled. If the viscosity is too low, it will not protect and decorate; if the viscosity is too high, the phenomenon of poor leveling and slow drying may occur. For the viscosity of the water-based glazing oil that uses offline glazing, it is generally recommended to be in 18 ～ 25 seconds (DIN 4, 25 ℃); The viscosity of light water-based varnish is generally recommended in 4 0 ～ 70 seconds (DIN 4, 25 ℃). The specific viscosity should be adjusted according to the characteristics of the paper and equipment.
0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; The thinner used in water-based varnish is generally {{5} }: 1 Alcohol aqueous solution, when the proportion of alcohol in the thinner is high, the drying speed will be faster, so it can be adjusted according to the specific situation. It should be noted that it cannot be diluted too much, otherwise it will reduce the abrasion resistance and gloss of the film.
0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; Due to the low temperature and humidity in winter, it is easy to use water-based varnish The problem of poor leveling occurs. The main reason is that the temperature is low and the viscosity of the aqueous varnish is high. It needs to be adjusted to the normal use viscosity by adding 1: 1 alcohol aqueous solution; Second, the humidity is low and the water-based glazing oil volatilizes quickly. It is necessary to slow down the volatilization rate by adding water, while appropriately reducing the drying temperature and air volume. In addition, when using water-based varnish in winter, you should put the water-based varnish to be used in the production workshop 24 hours in advance to make its temperature rise. Stir evenly before use and measure to adjust its Reuse viscosity.