Select the general amount of
silica gel desiccant simple calculation according to formula (A1) calculated as follows:
W = 1/2K * V ···············( A1)
Where:
W - the amount of silica gel desiccant, g;
K - coefficient between the desiccant moisture absorption rate of [K = Kb / Ka. Ka for the fine silica in the air temperature 25 ℃, relative humidity of 60% of the moisture absorption rate of 30%; Kb for other desiccant (such as molecular sieve, alumina, activated clay, etc.) at the same temperature and humidity conditions, the moisture absorption rate. When using silica gel thin air, K = 1];
V - Packaging container internal volume, dm3 (taking money).
A2 use silica gel desiccant
A2.1 Calculation of selected amount of silica gel:
Pore silica gel dosage according to formula (A2), (A3), (A4), (A5) calculation:
Using mechanical means sealed metal containers:
W = 20 + V + 0.5 D ... ... ... ... ... ... ... ... ... ... ... ... ... ... (A2)
Use of plastic bags made of composite materials:
W = 100AY + 0.5D ... ... ... ... ... ... ... ... ... ... ... ... ... ... (A3)
Polyethylene plastic film packaging materials such as bags made of:
W = 100AR1Y + 0.5D ... ... ... ... ... ... ... ... ... ... ... ... ... (A4)
Use sealing tape sealing cans and plastic containers:
W = 300R2Y + 0.5D ... ... ... ... ... ... ... ... ... ... ... ... ... ... (A5)
Where:
W - the amount of desiccant, g;
V - Packaging container internal volume, dm3 (taking money);
D - Package includes the quality of wet materials (wrapping paper, pads, cushions, etc.), g;
A - total area of packaging materials, m2 (taking money);
Y - pre-storage time (the time to take the next replacement of the desiccant), a;
R1 - the temperature is 40 ℃, relative humidity of 90% of packaging film materials under the conditions of water vapor transmission rate, g / (m2 · 24h);
R2 - the temperature is 40 ℃, relative humidity of 90% under the conditions of the sealing tape sealing cans, plastic containers of water vapor through the amount of humidity, g / (m2 · 24h);
