The temperature is getting higher! These things need to be paid attention to in the printing shop
Time:2022-07-04
Views:3811
Concern 1: temperature and humidity will affect the performance of paper and ink
Paper is made of plant fibers, which are porous and hydrophilic and very sensitive to water. Environmental temperature and humidity changes slightly, paper water content will change. The influence of relative humidity of air on paper moisture content is generally relative humidity increase, paper moisture content increase, on the contrary, relative humidity reduction, paper moisture content reduction.
And the temperature change on the paper moisture content of the impact of different. Generally, the temperature increases, the water content of the paper decreases. And paper water content size, and printing performance has a direct relationship. For example, paper water content changes can cause the paper to stretch (including local deformation). The dimensional stability of paper has a great relationship with the operation and alignment of printing. Especially multicolor overprinting products, paper size changes, will cause product overprinting is not allowed, become defective, waste. Therefore, paper size changes due to the influence of temperature and humidity are one of the most important problems in the printing shop.
Due to the change of water content of the paper, it will also cause changes in other properties of the paper. Such as water content, paper tensile strength, surface strength decreased; Water content is too low, the paper becomes brittle and hard, printing is easy to produce static charge phenomenon.
Various printing inks are affected by temperature and humidity. In general, the higher the temperature, the faster the drying; The lower the temperature, the slower the drying. In particular, lithographic printing process of ink, in the printing process, due to the presence of the fountain solution, will cause emulsification, so the relative humidity of the size of the impact of the evaporation of water in the ink. Therefore, temperature and humidity for ink drying speed has a direct impact, if the temperature is too low, relative humidity is too large, will reduce the drying speed of ink, extend the printing cycle.
Ambient temperature and humidity will also affect the viscosity of ink. Environmental temperature increase, ink viscosity reduction; Ambient temperature decreases, ink viscosity increases. If the temperature is too low, the ink viscosity is too large, printing failure will occur, such as local paper surface peeling, sticking to the blanket or printing plate.
Therefore, controlling the temperature and relative humidity of the printing shop can control the drying rate of ink and printing failure.
Therefore, controlling the temperature and relative humidity of the printing shop can control the drying rate of ink and printing failure.
Concern 2: High workshop temperature affects the normal operation of printing equipment
1) Wear of mechanical parts will intensify;
2) It has a greater impact on the electrical part. The control of the motor, air pump and oil pump on the offset press is protected by thermal appliances. If the temperature is too high, there will be overload protection action, which affects the normal operation.
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 the printing workshop is 18℃~23℃, and the relative humidity is 55%~65%. Printing enterprises can create a relatively stable production environment with the help of dehumidification and humidification integrated machine.
Enterprises should take timely measures to cope with the "high" temperature, and take measures to cool down and ventilate the hot production workshop. This is not only to ensure the storage quality of printing supplies, but also to ensure the physical safety of front-line employees of printing production.
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Anna Zhang