In freezing weather, the details that must be paid attention to in the printing and packaging process, have you GET it?

Affected by the strong cold air, the mountains and rivers of the motherland fell into the white ice and snow. In addition to the impact of everyone's travel, the production of packaging and printing enterprises was also affected by the low temperature weather.

　　So, what details should packaging printers pay attention to in this low temperature weather?

　　 Prevent web offset printing ink from thickening in cold weather

　　 For ink, if the room temperature and the liquid temperature of the ink change drastically, the ink migration state will change, and the color tone will also change accordingly. At the same time, low-temperature weather will have a significant impact on the ink transfer rate of the high-gloss parts. Therefore, when printing high-end products, the temperature and humidity of the printing workshop must be controlled anyway. In addition, when using the ink in winter, preheat it in advance to reduce the temperature change of the ink itself.

　　 Note that the ink is too thick and the viscosity is too high at low temperatures, but it is best not to adjust its viscosity with thinner or varnish. Because when the user needs to adjust the ink, the total amount of various additives that the ink manufacturer can contain is limited. If the amount exceeds the limit, even if it can be used, it will also weaken the basic performance of the ink and affect printing. Quality printing technology.

　　The ink thickening phenomenon caused by temperature can be solved by the following methods:

　　 (1) Put the original ink on the radiator or next to the heater to slowly heat up and gradually return to its original state.

(2) For emergency use, you can use boiled water for external heating. The specific method is to pour the boiled water into the basin, and then put the original bucket (box) of ink in the water, but prevent water vapor from entering, and wait until the water temperature drops to about 27 degrees Celsius. Take it out, open the lid and stir evenly before use. The temperature of the printing workshop should be kept at about 27 degrees Celsius.

　　Pay attention to the use of antifreeze UV varnish

　　UV varnish is also a material that is easily affected by low temperature. Therefore, many suppliers specialize in two different formulations of winter type and summer type. The solid content of the winter formula is lower than the summer formula, so that the leveling performance of the varnish can be better when the temperature is lower.

Note that if the winter formula is used in the summer, it is easy to cause the oil to be incompletely cured and easy to cause anti-sticking. On the contrary, if the summer formula is used in the winter, it will cause poor UV oil leveling performance, resulting in blistering and orange peel failure. .

　　The effect of low temperature weather on paper

In printing production, paper is one of the consumables that require extremely high environmental temperature and humidity. Paper is a porous material. Its basic structure is composed of plant fibers and auxiliary materials. It has strong hydrophilicity. If the environmental temperature and humidity are not good Control will cause paper deformation and affect normal printing. Therefore, maintaining a suitable environmental temperature and humidity is the key to improving the quality of paper printed products and improving production efficiency.

The requirement of ordinary paper for the ambient temperature is not so obvious, but when the ambient temperature is lower than 10 ℃, the ordinary paper will become very "brittle", the adhesion of the ink layer on its surface will decrease during the printing process, and it is easy to cause peeling. Ink phenomenon.

　　 Gold and silver card paper is usually produced by using coated paper, white paper, white cardboard, etc. as the base material, and then composite PET film or aluminum foil and other materials. Gold and silver card papers have higher requirements for environmental temperature. This is because metal and plastic materials are very sensitive to temperature changes. When the ambient temperature is lower than 10 ℃, it will greatly affect the suitability of gold and silver card papers. When the storage environment temperature of gold and silver card paper is around 0℃, after being transported from the paper warehouse to the printing workshop, a large amount of water vapor will appear on its surface due to the temperature difference, which will affect normal printing and even lead to waste. If you encounter the above-mentioned problems and the delivery time is tight, the staff can first turn on the UV lamp and let the paper run empty to make the temperature balance with the ambient temperature before formal printing.

　　 In addition, low temperature drying, low relative humidity, paper and air exchange moisture, the paper becomes dry, warped, and shrinks, which will cause poor overprinting.

　　The influence of low temperature on glue adhesive

　　 Adhesive is an important chemical agent in industrial production today, and the performance of the adhesive directly affects the quality of industrial products. An important technical index in the production of adhesives is temperature control. Most of the raw materials of adhesives are organic polymers, which are highly dependent on temperature, which means that their mechanical properties and viscoelasticity are affected by temperature changes. Influence. It should be pointed out that low temperature is the main culprit for false glue.

　　 When the temperature drops, the hardness of the adhesive becomes harder, which changes the stress of the adhesive. In the opposite low temperature state, the movement of polymer chains in the adhesive is restricted, reducing the flexibility of the adhesive.

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