Research: Required layer thickness in barrier packaging

Multi-layer injection blow molding containers must achieve minimum wall thickness for reliable barrier performance. Research at the Technical University Ilmenau in Germany shows that for the material combination of COP and PA in an A-B-A structure with PA in the middle layer, there are definite layer thicknesses of the two materials that will provide an optimum in technical and economic relation.
The middle layer thickness of PA should be above 100 micron to provide best oxygen barrier and the outside COP layers will provide best water vapor barrier with a total layer thickness of 200 microns. Including two COP layers, the total container wall thickness should not be less than 300 micron.
Click here for an article about the research (475 kB).
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