In high temperature weather, printing workshop needs to pay attention to matters
Time:2022-09-21
Views:2989
1、Temperature and humidity will affect the performance of paper, ink
Paper is made up of plant fibers, which are porous, hydrophilic and sensitive to water. Slight changes in ambient temperature and humidity, paper water content will change. The influence of air relative humidity on the water content of the paper is generally the relative humidity increase, the paper water content increase, on the contrary, the relative humidity decreases, the paper water content decreases.
And the influence of temperature change on the water content of paper is different. Generally, the temperature increases, paper water content decreases. And the size of the paper water content, and printing performance has a direct relationship. For example, paper water content changes will cause paper expansion (including local deformation). The dimensional stability of paper is closely related to the working suitability and registration suitability of printing. Especially multi-color overprinting products, paper size changes, will cause the product overprinting is not accurate, become defective, waste products. Therefore, the paper is affected by temperature, humidity and size change, in the printing shop is one of the most important problems.
Due to the change of water content of paper, it will also cause the change of other properties of paper. If the water content increases, the tensile strength of the paper, the surface strength decreases; Water content is too low, the paper becomes brittle and hard, printing is easy to produce electrostatic charge phenomenon.
Various printing inks are affected by temperature and humidity. Generally, the higher the temperature, the faster the drying; The lower the temperature, the slower the drying. In particular, the ink of lithography printing process, in the printing process, due to the presence of moisten liquid, will cause emulsification, so the size of the relative humidity affects the evaporation of water in the ink. Therefore, temperature and humidity have a direct impact on the ink drying speed, if the temperature is too low, the relative humidity is too large, will reduce the ink drying speed, prolong the printing cycle.
Ambient temperature and humidity will also affect the viscosity of the ink. The ambient temperature increases, the ink viscosity decreases; The ambient temperature decreases, the ink viscosity increases. If the temperature is too low, the ink viscosity is too large, printing failures will occur, such as paper surface partial peeling, stick to the blanket or plate. Therefore, controlling the temperature and relative humidity of the printing shop can control the drying speed of the ink, printing failure.
2、The workshop temperature is too high to affect the normal work of printing equipment
1) The wear of the mechanical part will be aggravated;
2) The impact on the electrical part is greater. The control of the motor, air pump and oil pump on the offset press are protected by thermal appliances. If the temperature is too high, overload protection action will occur, which will affect the normal work.
The change of temperature and humidity has great influence on the normal production of printing workshop.
Practice has proved that the best working environment temperature of printing workshop is 18℃~23℃, relative humidity is 55%~65%, printing enterprises can use dehumidification and humidification machine to create a relatively stable production environment of temperature and humidity for the workshop.
Enterprises should timely introduce countermeasures against the "rising" temperature, and take good measures for cooling and ventilation in hot production workshops. This is not only to ensure the storage quality of printing consumables, but also to ensure the physical safety of front-line employees in printing production.
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Anna Zhang