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TAPPI T 818 Ring crush

Standard:

TAPPI

Method:

TAPPI T 818

Title:

Ring crush of paperboard (flexible beam method)

Scope

The TAPPI T 818 Ring crush test correlates with edgewise compression strength of paperboard. This method is intended for paperboard between 0.28 mm (0.011 in.) and 0.51 mm (0.020 in.) thick. It may be used with less reliability for paperboard as thin as 0.18 mm (0.007 in.), and as thick as 0.76 mm (0.030 in.). The short span compression test, TAPPI T 826 “Short Span Compressive Strength of Paperboard,” measures edgewise compressive strength over a broader range of thickness.

Significance

The edgewise compression strength of corrugated board is a principal element in determining the dynamic compression strength of the container made from that board. Since fiberboard shipping containers are frequently subjected to loads which are resisted by compression strength, this property is an important measure of the performance characteristic of corrugated board, useful in controlling the manufacturing process and in measuring the quality of the finished product. Since edgewise compression can be estimated by a summation of the ring crush strengths of the liners and the medium, this test becomes a useful one for the corrugated boxmaker.

Summary

A compressive force is exerted on a specimen held in ring form in a special jig and placed between two platens of a compression machine, by causing the upper platen to approach the lower platen at a uniform speed until the specimen collapses.

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