Low temperature is coming. Have you paid attention to these details of printing and packaging process?
Time:2022-12-09
Views:2501
1. Prevent rotary offset printing ink thickening
For ink, if the room temperature and ink liquid temperature such as a large change, ink flow state will change, the tone will also change.
For ink, if the room temperature and ink liquid temperature such as a large change, ink flow state will change, the tone will also change.
At the same time, the low temperature weather on the highlight of the ink transfer rate will have a significant impact. Therefore, in the printing of high-grade products, in any case to control the temperature and humidity of the printing workshop. In addition, when using ink in winter to preheat in advance, in order to reduce the temperature of the ink itself.
Note, low temperature ink is too thick, viscosity is also large, but it is best not to use diluent or ink oil to adjust its viscosity. Because when the user needs to deploy ink, ink manufacturers output of the original ink can accommodate the total amount of various additives is limited, beyond the extreme limit, even if can be used, also weakened the basic performance of the ink, affecting the printing quality of printing technology.
The thickening of ink caused by temperature can be solved in the following ways:
2. Use freeze-resistant UV varnish
The thickening of ink caused by temperature can be solved in the following ways:
(1) the original ink on the radiator or heating next to the slow warming gradually restore to the original state.
(2) urgent use of boiling water can be used for external heating, the specific method is to pour the boiling water into the basin, and then the original bucket (box) ink in the water, but to prevent water vapor immersion, until the water temperature drops to 27 degrees Celsius to remove, open the cover and stir evenly can be used. The temperature in the printing shop should be kept at about 27 degrees Celsius.
2. Use freeze-resistant UV varnish
UV varnish is also a material that is easily affected by low temperatures, so many suppliers specialize in two different formulations, winter type and summer type. Winter formula relative to the summer formula solid content is lower, so that when the temperature is low, the smooth oil leveling performance can be better.
Note that if the winter formula is used in summer, it is easy to cause the oil curing is not complete, easy to cause anti-sticking phenomenon; On the contrary, the summer formula used in winter will cause poor UV oil leveling performance, resulting in foaming, orange peel failure.
3. The effect of low temperature on paper
4. Effect of low temperature on glue adhesives
In printing production, paper is one of the consumables with high requirements for environmental temperature and humidity. Paper is a porous substance, its basic structure is composed of plant fibers and auxiliary materials, and it has strong hydrophilicity. If the environmental temperature and humidity are not well controlled, it will cause paper deformation and affect normal printing. Therefore, keeping the appropriate environmental temperature and humidity is the key to improve the quality of paper printing and improve production efficiency.
Ordinary paper has less obvious requirements for ambient temperature, 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 in the printing process, which is easy to cause deinking phenomenon.
Gold and silver card paper is usually based on coated paper, white board paper, white card and other materials, and then composite PET film or aluminum foil and other materials, which has higher requirements on the environmental temperature. This is because metal and plastic materials are very sensitive to temperature changes. When the ambient temperature is lower than 10℃, the adaptability of gold and silver card paper will be greatly affected. When the ambient temperature of gold and silver card paper is about 0℃, the surface of the paper will appear a lot of water vapor due to the temperature difference after being transported from the paper bank to the printing workshop, which will affect the normal printing and even lead to the appearance of waste products.
If you encounter the above problems, and the delivery time is tight, the staff can first open the UV lamp to let the paper empty run again, so that the temperature and the ambient temperature balance after formal printing.
In addition, low temperature dry, low relative humidity, paper and air moisture exchange, paper dry, warped, shrinkage, will cause bad overprinting.
4. Effect of low temperature on glue adhesives
Adhesive is an important chemical preparation in industrial production. The properties of adhesive directly affect the quality of industrial products.
An important technical index in the production of adhesives is the control of temperature. The raw materials of adhesives are mostly organic polymers, which have a high dependence on temperature, which means that their mechanical properties and viscoelasticity are affected with the change of temperature. It should be pointed out that low temperature is the main cause of glue false adhesion.
When the temperature drops, the hardness of the adhesive becomes hard and the stress action of the adhesive is changed. At the opposite low temperature, the movement of polymer chains in the adhesive is limited, which reduces the elasticity of the adhesive.
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Anna Zhang