Parameters a, b and e are calculated according to DIN55474.

n =1/a*( V *+ m * c + A * e * WDD * t )

= 1/7.1 * (1 * 18.42+3 * 30+6 * 0.65 * 0.9 * 40) = 35 (rounded)

Therefore, in order to ensure that the humidity in the package is always below 50% within 40 days, we need to use 35 units of desiccant.

Desiccant adsorption units commonly used abroad. According to the adsorption capacity of desiccant, a "unit" desiccant can adsorb 3.00g of water vapor at the equilibrium temperature of 25℃ (RH =20%), and a "unit" desiccant can adsorb 6.00g of water vapor at the equilibrium temperature of 25℃ (RH =40%). To be exact, a "unit" montmorillonite desiccant is equivalent to 33.

Shanghai Bozhao Desiccant Manufacturing Co., Ltd. has more than 20 years of industry experience, and its products include silica gel desiccant, montmorillonite desiccant (DIN standard), mineral desiccant, calcium chloride desiccant, high moisture absorption magnesium chloride desiccant, container desiccant, roll desiccant, gas phase rust inhibitor, deoxidizer, etc., which are widely used in machinery, electronics, instruments, meters, leather, processed food, tea, clothing, shoes and hats and other industries.