For the printing industry, in the production process, especially to ensure adequate humidity, why the need to humidify? How much humidity should be maintained to achieve good printing results? Let's break it down.
What is the function of the mist spray humidifier for the printing shop?
Usually the temperature of the printing shop is 20 ~ 22℃, and the relative humidity is 45 ~ 60%. At present, some domestic printing enterprises should not only take reasonable temperature and humidity control to the printing shop, but also strict requirements on the temperature and humidity of the paper bank: 18 ~ 20℃, 60 ~ 65% RH, to ensure that the paper has sufficient moisture content before entering the printing shop, to prevent paper deformation.
Eliminate static electricity
The mist system neutralizes the positive and negative charged particles of an object by misting a liquid into extremely fine droplets.Paper is easy to produce static electricity, the staff often feel electric shock, and accompanied by electrostatic pulping phenomenon, especially in the autumn and winter season often appear in the dry season. The intensity of static electricity is closely related to the ambient humidity. Static electricity is active in 30% of the relative humidity. The lower the humidity, the more active the static electricity is. It gradually weakens with the increase of humidity, and almost disappears when the humidity is above 50%.
Avoid wrinkles
The dry fog system in the mist system can attach very fine droplets to the surface of the paper, which can humidify the paper without wetting the paper.Paper wrinkle is due to the appearance of "lotus leaf edge" or "tight edge" phenomenon, so that the paper cannot be stretched smoothly, printing wrinkles. This phenomenon can cause a lot of printer waste. Prevent stretching deformation. Because of the variety of paper, its expansion and contraction rates are different. If the paper and the environment do not achieve a moisture balance, the following conditions will result: the paper absorbs water and expands, water loss and shrinkage. When the deformation of monochrome printing machine can not overprint, multi-color printing will also appear a color than a color in turn elongation phenomenon, or drag part of the fan "swing Angle", resulting in overprint or front and back due to expansion and not set or printing paper expansion, bring a lot of trouble to the next processing process.
Falling scraps of paper
At the same time, the atomizing droplets of the misting system float in the air. Attached with the confetti in the air, let the confetti drop to the ground, thus reducing the damage of confetti in the air.The paper powder contained in the paper and the dust in the air flying around in the drying chamber have different degrees of influence on the quality of the printed matter. When the humidity in a room exceeds 50 percent, various dust flocs absorb water and become heavy and fall to the ground.
Because of the above reasons, it is necessary to use the water mist nozzle to humidify the air of the printing plant, and use the water mist nozzle to humidify the air, so as to ensure that the nozzle stops working after dripping and leaks droplets, so as not to pollute finished or semi-finished products.