American Pulp and Paper Technology Association test standards

This method cannot be used to test the reflection quality of patterns.

Moisture absorption of T 831 om-05 Corrugated core paper - Water drop penetration test

The water absorption rate of corrugated core paper is based on dripping water on the surface of the sample and determining the time in seconds for the water drop to penetrate from the surface to the lower layer.

This method is suitable for corrugated core paper and has been applied to commercial production. Not suitable for comparison of paperboards produced from different gram weights of paper.

There are three alternative methods, which can be carried out simultaneously. Different methods give different values.

TAPPI T 432 absorbent paper and TAPPI UM 596

Non-absorbent paperboards have been used to measure the water absorption of corrugated core paper, but studies promoting this method have shown that it lacks repeatability and is very time consuming, especially for some samples with strong water resistance.

The following are the changes and additions to the TAPPI test methodology in March 2004:

T 453 Characteristics of drying and heating on paper and board materials

This method is suitable for printing and writing paper, but can also be used as a measurement standard for other types of paper and paperboard.

Compressive strength of T 826 short box board

This method is suitable for boxes with a width to thickness ratio of 5 or less.