Winter is coming. With the coming of cold air, strong wind and cooling weather have appeared in many places. The sudden drop in temperature will not only affect your travel, but also affect some printing processes. So, in this cold weather, what details should Shandong pay attention to when printing and packaging?
Prevent offset printing ink from thickening
For printing ink, if the room temperature and the liquid temperature of printing ink change significantly, the ink migration state will change, and the color will also change. At the same time, the low temperature weather will have a significant impact on the ink transfer rate in the high light areas. Therefore, when printing products, the temperature and humidity of the printing workshop should be controlled in any case. In addition, the ink should be preheated in advance when it is used in winter to reduce the temperature change of the ink itself.
The ink thickening caused by temperature can be solved by the following methods:
(1) Place the original ink on the radiator or beside the heater, and make it slowly warm up and gradually return to its original state.
(2) In case of emergency, 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 of ink in the water, but prevent the water vapor from being immersed. When the water temperature drops to about 27 ℃, take it out, open the lid and stir it evenly before use. The temperature of the printing workshop should be kept at about 27 ℃.
Influence of low temperature weather on paper
If the ambient temperature and humidity are not well controlled, the paper will be deformed and normal printing will be affected. Therefore, maintaining the appropriate environmental temperature and humidity is the key to improve the quality of paper prints and improve production efficiency. The requirements for ambient temperature of ordinary paper are not so obvious, but when the ambient temperature is lower than 10 ℃, ordinary paper will become very "brittle", and the adhesion of the ink layer on its surface will decline during printing, which is easy to cause deinking.
Gold and silver card paper is usually made of coated paper, white board paper, white card paper and other substrates, and then compounded with PET film or aluminum foil and other materials, which requires higher environmental temperature. This is because both metal and plastic materials are very sensitive to temperature changes. When the ambient temperature is lower than 10 ℃, the suitability of gold and silver card paper will be greatly affected. When the storage ambient temperature of gold and silver card paper is about 0 ℃, after it is transported from the paper warehouse to the printing workshop, its surface will have a lot of moisture due to temperature difference, which will affect the normal printing, and even lead to waste products.
If the above problems are encountered, and the delivery date is tight, the staff can first turn on the UV lamp to let the paper run through the air, so that its temperature is balanced with the ambient temperature before formal printing. In addition, low temperature drying, low relative humidity, moisture exchange between paper and air, paper drying, warping, shrinkage, will cause poor overprint.
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