For paper packaging products, is extremely sensitive to the humidity, because all the corrugated board packaging products, whether it is three or five or seven, they all have the basic requirements of physical indicators, that is pressure-bearing. Especially the master carton or exclusive use color box, they needs to stacking from the product packaging, transportation, loading and unloading and then warehouse stacking, such a series of logistics operations, each step was a rigorous test for the box pressure. if the carton can not guarantee that the product bearing capacity stacking requirements, then the logistics process in the product code on the occurrence of the phenomenon of collapse will happen anytime soon collapse code appears, it is bound to cause damage to the product, even devastating damage.

So,what's the impact of humidity on the board? based on nearly 20 years experience in this field, to estimates that, from 8%, humidity increase every one percentage point, pressure capacity decreased 8-10%, if the paper grade is low, if the ring crush Index for corrugated paper was under 7.5, its bearing capacity loss over 15%. The lower ring crush index, decreased pressure ability more obvious. When the humidity reaches 15% of cardboard,the pressure value decreased rate was 35-40%. Therefore, once the cardboard humidity exceeds the allowable standard of 11%, 8% of the standard finished humidity values, your bearing capacity of the box would have no standards at all,That's why formula calculate results was a very big diffrence to the actual test results

Why humidity for corrugated box appear so unstable. The main reason is humidifying cardboard during the production process in addition to environment humidity. Environmental impact of cartons humidity mainly in moisture and damp cardboard. Generally 15% humidity cardboard BCA watts at 40% humidity enviroment, it needs 120 - 150 minutes to completely dry, the humidity in the ventilated environment can reach 10%. And when the ambient humidity is 60%, the drying rate will be reduced to 1500-1800 minutes. And when the humidity reaches 80%, cardboard will stop dry, semi-dry cartons would have been damp phenomenon. Cardboard carton forming and manufacturing process, the greater the amount of plastic used, the more serious the degree of damp, because the adhesive cardboard boxes currently used is alkaline. Because the bases are the water absorbent properties, so it is easy alkaline absorbent material damp. Then, once the ambient humidity above 80%, damp cardboard cartons appears.

In High humidity areas, in the annual winter until the beginning of March this period for up to three quarters of the time paper and packaging companies had to rely on the sun methods to help solve or alleviate effects of humidity, but this method is very passive, after all, because you can have sun sun, not the sun when you are supposed to do, not to mention full sun really direct exposure to the sun, you do not dare drying up because this time you re the sun, it will cause serious distortion boxes, and even the color of yellowing.