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You are here: opti-pack > E4: Design Protection against Climate

E4: Design Protection against Climate

Calcullation can be done as follows:

Film formel 1

Permeability coefficient: P

Area on surface: A

Time: t

Vapour pressure on both sides: pi and po

Film thickness: l 

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Film formel 2

Permeability coefficient, P, is dependent of:

Constant: P0

Activating energy: Ed

Gas constant: R = 0,0821 l*bar/mol*oK

Temperature in oK(=oC+273): T

Constant: k1

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In case of films with several different layers you calculate:

Film formel 3

Laminate thickness: L

Layer thickness in layer n: Xn

Total permiability: PPermiability in layer n: Pn