Influence of Climate Change on the Quality of Film Printing Products

With the development of the flexible packaging industry, the continuous expansion of the plastic printing industry and the fierce competition in the market, the plastic gravure printing companies are faced with many difficulties and problems, especially the cold food products market is more prominent. Some companies use low-grade materials for color printing and bagging. Although prices have a place in the market, many quality problems have emerged. The following analysis is made on the issues that affect the printing quality due to climate change:

Impact of climate on film properties

Changes in the climate change the properties of plastic films, too high temperature and humidity film absorption is relatively high, printing ink is not easy to dry, directly affect the gloss of the ink. Because the ink is drying too slowly, the printing will increase the drying conditions, forcing the ink to evaporate too quickly, resulting in poor gloss and poor ink. If the printed nylon film is high in temperature and humidity, it is more prominent, and some phenomena such as poor fastness are prone to occur. Based on these circumstances, when using a film, use the film produced recently and pay attention to the packaging of the film to avoid the above phenomenon.

The influence of climate on ink performance The quality of ink drying directly affects the quality of the product. Drying of the ink, in addition to drying conditions of the ink itself, the impact of climate is the most important. The effects of climate can be divided into: too fast drying, high temperature, and low humidity. Humidity and high temperatures make printing more difficult. In the high-temperature season of summer, the drying speed of the inner layer on the printed matter is obviously too fast; on the contrary, the dryness of the ink layer factory is obviously slow. Therefore, to ease the reaction of the ink to the environment temperature and humidity, when using the ink thinner, use the solvent that meets the national standard to prepare fast and dry thin materials, and then control the temperature and humidity of the workshop. The general printing shop is at about 25°C, and the humidity cloth is 65%— 75% between.

Controlling the influence of climate on printed products When the air temperature is too high and the humidity is too high, the pigment powder of the ink itself is prone to absorb water, and the water absorption rate is too high, which may cause the ink to thicken and fail to meet the requirements of the printed products because the colors of the ink are different. The pigment powder used does not matter, and the water absorption rate is also different. Example: Red pigment powder has higher water absorption than other pigments. Therefore, there is a change in the climate. When the temperature and humidity are too high, the ink fountain should be controlled and a semi-enclosed and stirred ink stick should be used. If the water droplets appear in the ink fountain, the sponge should be used to suck it out and add new ink in time. Immediately after shutdown, the ink in the ink fountain is released and sealed.
Control solvent quality: In addition to controlling the impact of climate on printed products, we must also use solvents that meet the national standard. Many companies use table printing inks to replace composite inks. The performance of the general table printing ink is different from the performance of the compound ink, the use of solvents is also different, the solvent can not meet the requirements, the ingredients are different, the evaporation speed is not the same, some of the solvents have high water content, add ink After a certain period of time, water is absorbed by the pigment powder and it easily reacts, causing separation and expansion, and the compound odor and air bubbles are liable to occur, affecting the firmness and the like. When the surface is printed, the inner layer is too thick and the thinner material cannot meet the requirements. It is also easy to cause primary and secondary adhesion phenomena. Therefore, controlling the quality of solvents is an important guarantee for the quality of printed products.