In printing production, paper is one of the most demanding materials for the environment. Because paper is a porous structural material composed of plant fibers supplemented with various excipients, it has strong hydrophilicity. If the ambient temperature and humidity are not well controlled, the paper will be deformed. This deformation is often only one or two millimeters. But don't underestimate the change of 1~2mm. For high-volume imprinting products, it is enough to affect the final printing quality. Therefore, maintaining proper ambient temperature and humidity is the key to improving the quality of paper printing and improving production efficiency.
Data collection: the effect of temperature and humidity on paper size
We sampled and tested four kinds of commonly used papers in two production workshops, and obtained different types and sizes of papers in different temperature and humidity environments. The specific changes of the dimensions are shown in Tables 1 to 4. .
Through the analysis of the data listed in Tables 1 to 4, we found that no matter what kind of paper is placed in different temperature and humidity environments, it will cause abnormalities in paper size reduction or enlargement, but different papers have different temperature and humidity. .
As shown in Table 1 in the ordinary 7 1 g / m2 plain aluminized paper in Workshop 2, the lateral dimensions of the paper measured by three samplings are reduced, especially after 72 hours in a workshop environment with a temperature and humidity of 21 ° C / 35%. The paper size is reduced by 1.5mm in the horizontal direction; the same type of paper in the workshop 1 is only collected in the case of the temperature and humidity of 25 ° C / 55% after entering the workshop for 24 hours, the lateral increase is 0.2mm, the water content is slightly There was an increase, and in the two sampling tests where the ambient temperature and humidity were 27 ° C / 55% and 2 7 ° C / 5 2 %, respectively, although the moisture content of the paper was reduced, the size did not change.
The sub-grain aluminized paper in Table 2, only after entering the workshop 2 for 24 hours, the paper collected under the environment of temperature and humidity of 26 °C/40%, the lateral dimension is reduced by 1mm, and the other humidity is not less than 50%. The measured paper size did not change. The single-sided coated paper in Table 3 has no change in the paper size measured by the temperature and humidity of 25 ° C / 40%, and the others have different degrees of increase, measured in a temperature and humidity environment of 22 ° C / 60%. The horizontal size of the paper even rose by 2.5mm. The waterproof coated paper in Table 4 has no change in the paper size measured when the temperature and humidity in the workshop 1 is 22 ° C / 45%, and the other is reduced or enlarged, but the variation is significantly smaller than that of the single-sided coated paper.
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