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Testing Packages
AQUATRAN Model 3/40 Operator's Manual
Package Mounting Methods
There are many different types of packages and most of them can be tested on the AQUATRAN Model
3/40. To test packages a Diffusion Cell must be created to provide the required difference in permeant
concentration across the barrier material. The creation of an effective Diffusion Cell is often the most difficult
and complex part of performing a permeation test on a package.
The process of creating the Diffusion Cell is often referred to as "fixturing" or "mounting" the sample. When
testing packages, the sample itself is often an important structural element of the Diffusion Cell. An
important element of the Diffusion Cells used in the AQUATRAN Model 3/40 is the reusable components
collectively referred to as a Test Cartridge.
Most packages can be classified as belonging to one of two categories, rigid (and semi-rigid) packages or
flexible packages. The type of package (rigid or flexible) usually determines the approach used to mount the
package. The design of the Test Cartridges is optimized for the type of samples to be tested. This chapter
contains an overview of how the Test Cartridges designed for testing rigid packages and semi-rigid
packages and those designed for testing flexible packages are used. More detailed information is provided
in the "User Guide" included with each Test Cartridge.
Mounting Rigid and Semi-Rigid Packages
A common characteristic of a rigid or semi-rigid package is an open area that must be sealed to create the
Carrier Gas side of the Diffusion Cell. The perimeter of this open area usually contains a feature used to
seal the filled package. This feature is also used to seal the package to an impermeable barrier material
creating the Carrier Gas side of the cell.
Figure 6-1: Rigid Package Test Cartridge
The Test Cartridges intended for use with rigid and semi rigid packages are designed to use a disposable
aluminum foil for this impermeable barrier. This barrier material is referred to as a "Mounting Foil" or as a
"foil". A selection of Test Cartridge optimized for different sizes and styles of trays, cups and bottles is
available to suit your specific needs. For convenience, each type of Test Cartridge is designed to use a
precut mounting foil.
Mounting a package in a Test Cartridge designed to use a Mounting Foil consists of several basic steps.
The opening in the package is sealed to a Mounting foil using an appropriate adhesive. If necessary, an
6-2
Revision D
MOCON, Inc.
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