The Role of Polyolefins in “Protecting” Moisture Sensitive Barrier Layers in Packaging Structures, 18IFPED

It is well known that the oxygen permeation of many barrier polymers, including EVOH and polyamide (nylon), increases with increasing relative humidity (RH).  Many in the industry believe sandwiching the barrier polymer between layers of polyolefins “protects” the barrier by preventing moisture from reaching the barrier layer.  Permeation, however, is an equilibrium measurement.  The presence of a high moisture barrier polyolefin merely delays the time for the barrier layer to reach its equilibrium moisture content.  Since flexible package films are thin, the time to reach equilibrium is short, even when high moisture barrier layers are present.  In a symmetric film structure with the barrier layer in the middle, at equilibrium the barrier layer will experience an effective RH halfway between the inside and outside environments of the package, no matter what the composition of the skin layers are.  Polyolefins used in conjunction with barrier layer location, however, can shift the effective RH of the barrier layer towards that of the lower RH side of the package, reducing oxygen permeation.    Model equations are developed that highlight this effect and show how it can be used to optimize barrier packaging structures. 

TAPPI conference proceedings and presentations, technical papers, and publication articles provide technical and management data and solutions on topics covering the Pulp, Paper, Tissue, Corrugated Packaging, Flexible Packaging, Nanotechnology and Converting Industries.

Simply select the quantity, add to your cart and your conference paper, presentation or article will be available for immediate download.

The Role of Polyolefins in “Protecting” Moisture Sensitive B
The Role of Polyolefins in “Protecting” Moisture Sensitive Barrier Layers in Packaging Structures, 18IFPED

New Releases

TAPPI PRESS Catalog eBook 2024

Experience the Power of Publications in the 2024 TAPPI Press Catalog



Kraft Recovery Boilers, Third Edition  

Sponsored by the Recovery Boiler Program R&D Subcommittee of the American Forest & Paper Association (AF&PA) and published by TAPPI Press.



Handbook For Pulp and Paper Technologists (The SMOOK Book), Fourth Edition

The best-selling text to introduce the entire technology of pulp and paper manufacture.



Guidelines for Safe Assessment and Operation of Yankee Dryers  

A project of the Yankee Dryer Safety & Reliability Committee.



Check our newest additions.

TAPPI Press offers some of the most in-depth resources and references for the forest products and related industries. 

See More


Available for Purchase – Conference Proceedings

TAPPI maintains a record of key conference papers, presentations, and other conference publications, available for purchase in a variety of formats.

See More