Predicting Permeability & Transmission Rate for Multilayer Materials

The authors recommend the proper equations to predict permeability and/or transmission rate—critical factors in the selection of food packaging materials to help maintain food quality

Food Technology Magazine | Article

KAY COOKSEY, KENNETH S. MARSH,

LEROY H. DOAR

In preparation for teaching his Packaging Materials class, Clemson University faculty member LeRoy Doar was reviewing equations used to calculate permeability for laminated materials using Hanlon’s Package Engineering textbook. He immediately noticed that the equation in the second edition (Hanlon, 1984) was different from that in the third edition (Hanlon, 1998). After checking other references, he asked other faculty in the nearby offices for their opinions to determine the correct equation.

We…

Fig. 1—Cross-section of a 7-layer barrier material photographed using 200× magnification

Table 1 Units used to express permeability and transmission rate


Table-3 Data used for calculations

Table-5 Predicted permeability for each equation and each calculation


Eq1 Calculating transmission rate from transmission rate data

Eq 2 Calculating transmission rate from permeability data


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