ISO 13821:2020 コルゲートファイバーボード—エッジワイズクラッシュ耐性の決定—ワックスエッジ法 | ページ 2

Foreword

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This document was prepared by Technical Committee ISO/TC 6/SC 2, Test methods and quality specifications for paper and board.

This second edition cancels and replaces the first edition (ISO 13821:2002), of which it constitutes a minor revision.

The main changes compared to the previous edition are as follows:

• Introduction of an additional group in the Introduction clause;
• Information on sampling of corrugated shipping containers are added in Clause 6;
• Information in 8.2 on the height of the test pieces;
• Introduction of precision data based on TAPPI comparative testing service.

Introduction

A variety of methods for the determination of edgewise crush resistance are in use in different parts of the world. These can be classified into four groups as follows:

• a) Those in which a carefully cut rectangular test piece is tested without any special treatment or modification.
• b) Those in which the edges of the test piece to which the force is applied are waxed to prevent the test result from being influenced by “edge effects”.
• c) Those in which the test piece edges are not waxed but the shape of the test piece is such that the length is substantially reduced at a point midway between the loading edges in order to induce the failure to occur away from those edges.
• d) Those in which carefully cut rectangular pieces are tested with edges clamped to prevent the test result from being influenced by"edge effects".

The dimensions of the test piece vary from one group to the other and, in group c), the methods vary according to the shape and method of reducing the length.

The methods may not give the same numerical results, but it can be shown that most of them can be used to predict the top-to-bottom compression strength which will be achieved when the board is properly converted into a transport package.

This document describes a method from group b) intended to be used for quality measurement and quality specification purposes. This particular method is selected because it correlates well with the top-to-bottom compression strength of the final transport package and provides significantly higher results than unwaxed methods (a) because edge effects are avoided.

1 Scope

This document specifies a method for the determination of the edgewise crush resistance of corrugated fibreboard. The force is applied in the direction of the flute axis.

This method is applicable to single-wall (double-faced), double-wall, and triple-wall corrugated fibreboard. It may also be used to test samples taken from corrugated cases and other converted products.

While the method is applicable to waxed corrugated fibreboard, care must be taken that the heat used in the waxing step does not affect the corrugated structure. This is controlled by observing that failure during the test still occurs away from the loaded edges.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

3 Terms and definitions

No terms and definitions are listed in this document.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

Bibliography