The two international standards for adhesion strength (PAT) testing in the corrugated cardboard industry are:
-testleri.jpg "Adhesion Strength (PAT) Tests")
The AS/NZS 1301.430s standard, an Australian / New Zealand standard, describes a test method for determining the force required to break the bond between a liner in corrugated cardboard and the corrugated media. It consists of corrugated board, liner and heavy paper media. The liner is the flat, outer surface that adheres to the medium. The media is wavy, corrugated paper between the liners. Both are produced from a special type of heavy paper called containerboard. The corrugated board composition consists of pulp material. The pulp is predominantly made from timber and is created using recycled sawdust.
The TAPPI T 821 standard, developed by the Pulp, Paper and Conversion Industry Technical Association (TAPPI), defines a test method to measure the force required to separate the corrugated cardboard between the corrugated ends of the corrugated cardboard and its primer coating surfaces. This is a compression method. The two parts are pushed apart by two rows of pins (support and pressure pins) spaced according to the groove dimensions.
Good adhesion of the corrugated media to their coating is essential in obtaining high quality corrugated boards and boxes. The adhesion strength (PAT) test provides a means to determine the nature and strength of the bond formed during the joining process and is used to detect certain manufacturing defects such as poor adhesive penetration, spotty adhesion, and cardboard with low internal bond strength.
The test method described in this standard measures the Z-direction force required to selectively separate the inner or outer surface of the corrugated board. But when a liner is too flexible, it tends to bend around the pressure pins and a shear error will occur rather than a straight Z-direction error resulting in lower readings.
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