Because of the influence of strong cold air, was the land of the motherland in the white snow, in addition to everyone's trip is affected, packaging and printing enterprise production is also affected by the cold weather.

So what are the details of packaging printers in this cold weather?

Prevent rotary offset printing ink thickening in cold weather.

For the ink, if room temperature and ink liquid temperature has a large change, the ink transfer status will change, the tone will also change. At the same time, the low temperature will have a significant effect on the transfer rate of the ink. Therefore, in the printing of high-grade products, no matter how to control the temperature and humidity of the printing shop. In addition, when using ink in winter, preheat to reduce the temperature of the ink itself.

Note that the ink is too thick at low temperature and the viscosity is large, but it is better not to adjust the consistency of the ink with diluent or oil. Because when users need to allocate ink, printing ink factory production of the original ink can hold all kinds of additives, there is a limit to the amount of beyond is extremely limited, even if you can use, also weaken the basic performance of ink, affect the printing quality of printing technology.

Ink thickening caused by temperature can be solved by:

(1) place the original ink on the radiator or heater, so that its slow heating gradually returns to its original shape.

(2) the push the boiled water can be used for external heat, specific method is to put the boiled water into the basin, and then put the original barrel (box) ink in the water, but to prevent vapor into, to be out when the temperature drops to 27 degrees Celsius, open mix can be used. The temperature of the printing shop should be kept at about 27c.

Pay attention to the use of antifreeze UV varnish.

UV varnish is also a material that can be easily affected by low temperature. Therefore, many suppliers specialize in producing two different kinds of formulas for winter and summer. The winter formulation is lower than the summer formulation, so that the smooth performance of the light oil can be better when the temperature is low.

Note that if the winter formula is used in summer, it is easy to cause the oil solidification not completely, and it is easy to cause anti-adhesion. Conversely, the summer formulation is used in the winter, can cause UV oil leveling performance poor, resulting in bubbling, orange peel failure.

The effect of cold weather on paper.

In the production of printing, paper is one of the consumables to require very high environmental temperature and humidity, paper for porous material, its basic structure is composed of plant fiber and accessories, with strong hydrophilic, if can not get good control, environmental temperature and humidity can cause paper distortion, affect the normal printing. Therefore, it is the key to improve the quality of paper printing and improve production efficiency.

Ordinary paper to the requirement of the environment temperature is not so obvious, but when the environmental temperature under 10 ℃ when, ordinary paper can become very "brittle", in the process of the printing ink layer on the surface of adhesion will drop, easy to cause the deinking phenomenon.

Gold and silver card paper is usually made of coated paper, white paper, white paper, etc., and then composite PET film or aluminum foil. Gold and silver card type of paper on the environment temperature of some higher requirements, this is because the metal and plastic material are very sensitive to temperature changes, when the environmental temperature under 10 ℃ when, will greatly influence the gold and silver card paper Zhang Shi sex, when the gold and silver card class paper storage environment temperature in 0 ℃ or so, since paper library to the printing shop, its surface will appear a large number of water vapor due to temperature difference, affect the normal printing, even lead to scrap. If the above problem is encountered, and the delivery time is tight, the staff can open the UV lamp tube first to make the paper run again, so that the temperature is in balance with the ambient temperature before printing.

In addition, low temperature dry, relative humidity is low, paper and air carry on moisture exchange, paper becomes dry, become warped, shrink, can cause overprinter bad.

The effect of low temperature on glue adhesive.

Adhesive is an important chemical preparation in industrial production, and the properties of adhesives directly affect the quality of industrial products. An important technical index in adhesive production is the control of the temperature, the raw materials are mostly organic polymer adhesive, the material for high temperature dependence, which means their mechanical properties and viscoelasticity affected as the temperature changes. It should be pointed out that low temperature is the main culprit causing glue splicing.

When the temperature drops, the hardness of the adhesive stiffens, changing the stress of the adhesive. In the contrary low temperature condition, the polymer chain movement in adhesive is limited, and the scaling of adhesive is reduced.