Desiccating agent consumption calculation
Calculation method by JIS Z 0301
The desiccating agent, please find the consumption by the following expressions depending on a use and the situation.
(1)
W: Consumption (g) of the desiccating agent
R: Of JIS Z 0208 [vapor permeance test method (cup method) of the moistureproof wrapping]
Vapor permeance (g/m^{2}, 24h) of the moistureproof wrapping by condition B
A: Surface area (m^{2}) of the moistureproof packing
t: Packing period Sunday (= 24h) (1)
h1: Mean humidity (%) of the fresh air during a packing period
h2: Mean humidity (%) (2) in the packing during a packing period
K1: Moistureproof wrapping coefficient (3) to be decided by kind and average temperature θ ℃ during a packing period
C1: Moisture absorption rate (%) of the desiccating agent at the time of the beginning to use
C2: Equilibrium moisture absorption rate (%) of the desiccating agent in the relative humidity of the maximum permitted by the packing inside
K2: Wrapping coefficient (4) to be decided by a moisture absorption rate with the absorbency in the packing
D: Mass (g) of the wrapping with the absorbency in the packing
R: Of JIS Z 0208 [vapor permeance test method (cup method) of the moistureproof wrapping]
Vapor permeance (g/m^{2}, 24h) of the moistureproof wrapping by condition B
A: Surface area (m^{2}) of the moistureproof packing
t: Packing period Sunday (= 24h) (1)
h1: Mean humidity (%) of the fresh air during a packing period
h2: Mean humidity (%) (2) in the packing during a packing period
K1: Moistureproof wrapping coefficient (3) to be decided by kind and average temperature θ ℃ during a packing period
C1: Moisture absorption rate (%) of the desiccating agent at the time of the beginning to use
C2: Equilibrium moisture absorption rate (%) of the desiccating agent in the relative humidity of the maximum permitted by the packing inside
K2: Wrapping coefficient (4) to be decided by a moisture absorption rate with the absorbency in the packing
D: Mass (g) of the wrapping with the absorbency in the packing
Note (1)

When a change of temperature, the humidity during a packing period is big, you divide a packing period properly and calculate the desiccating agent consumption during each period and may add this. 
(2)  For kisanchi, I take the middle value with the humidity of the maximum permitted within humidity and packing in the early packing. 
(3)  I calculate the value of K1 by the next expression. 
Pθ: I can put it in mean temperature θ ℃ during a packing period
Moisturepermeable rate (g, cm/cm^{2}, s, kPa) of the moistureproof wrapping P40: Moisturepermeable rate (g, cm/cm^{2}, s, kPa) of the moistureproof wrapping in 40 degrees Celsius pθ: I divide saturated steam in θ ℃ (kPa) p40: I divide saturated steam in 40 degrees Celsius (kPa) 
■I show a value of K1 in various temperature of the film for the reference ... a lot of packing to the reference list.
Film
 40 degrees Celsius
 35 degrees Celsius
 30 degrees Celsius
 25 degrees Celsius
 20 degrees Celsius
 15 degrees Celsius
 10 degrees Celsius
 5 degrees Celsius

Polyester
 11.1 x
10^{3}  7.3 x
10^{3}  4.9 x
10^{3}  3.1 x
10^{3}  2.0 x
10^{3}  1.27 x
10^{3}  0.81 x
10^{3}  0.48 x
10^{3} 
Low density
Polyethylene  11.1 x
10^{3}  7.0 x
10^{3}  4.5 x
10^{3}  2.8 x
10^{3}  1.8 x
10^{3}  1.05 x
10^{3}  0.63 x
10^{3}  0.36 x
10^{3} 
High density
Polyethylene  11.1 x
10^{3}  6.9 x
10^{3}  4.4 x
10^{3}  2.7 x
10^{3}  1.7 x
10^{3}  1.0 x
10^{3}  0.59 x
10^{3}  0.33 x
10^{3} 
Polypropylene
 11.1 x
10^{3}  6.9 x
10^{3}  4.3 x
10^{3}  2.5 x
10^{3}  1.6 x
10^{3}  0.92 x
10^{3}  0.53 x
10^{3}  0.29 x
10^{3} 
Polychlorination
Vinylidene  11.1 x
10^{3}  6.5 x
10^{3}  3.9 x
10^{3}  2.2 x
10^{3}  1.3 x
10^{3}  0.74 x
10^{3}  0.40 x
10^{3}  0.21 x
10^{3} 
Note (4)

I calculate K2 by the next expression.
C1: Moisture absorption rate (%) of the desiccating agent at the time of the packing start
C2: Equilibrium moisture absorption rate (%) of the desiccating agent in the humidity of the maximum permitted within packing C3: Equilibrium moisture absorption rate (%) of the wrapping with the absorbency in the humidity of the maximum permitted within packing C4: Moisture absorption rate (%) of the wrapping with the absorbency when I put it in the packing 
(2)
I calculate R = 0, the consumption of the desiccating agent at the age of D = 0 by the next expression.
I calculate R = 0, the consumption of the desiccating agent at the age of D = 0 by the next expression.
V: The space capacity (m^{3}) in the packing container except the capacity of the packing contents
H: Absolute humidity (g/m^{3}) in the temperaturehumidity at the time of the packing
C1: Moisture absorption rate (%) of the desiccating agent at the time of the packing start
C2: Equilibrium moisture absorption rate (%) of the desiccating agent in the humidity of the maximum permitted within packing
H: Absolute humidity (g/m^{3}) in the temperaturehumidity at the time of the packing
C1: Moisture absorption rate (%) of the desiccating agent at the time of the packing start
C2: Equilibrium moisture absorption rate (%) of the desiccating agent in the humidity of the maximum permitted within packing