ISO 4674-1:2016 ゴムまたはプラスチックでコーティングされた布—引き裂き抵抗の決定—パート1：一定速度の引き裂き方法 | ページ 2

Foreword

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The committee responsible for this document is ISO/TC 45, Rubber and rubber products, Subcommittee SC 4, Products (other than hoses).

This second edition cancels and replaces the first edition (ISO 4674-1:2003), which has been technically revised. The changes are as follows.

• The title of Clause 4 has been changed to “Apparatus and reagents”. The clamping device and some reagents have been added.
• Clause 5 has been broken down to two subclauses for conditioning and for testing respectively. The atmosphere of conditioning has been referred to the condition of “1” specified in ISO 2231:1989.
• New Clause 6 “Time-interval between manufacturing and testing” has been added.
• In 7.1, 7.2, 8.1, and 8.2, the wet testing has been moved from Clause 5 with partial modification.
• In 7.2 and 8.2, the procedure of handling abnormal test results has been incorporated. The NOTE in each subclause has been moved to the body text respectively.
• In Clause 10, item f) has been added.
• Annex B has been changed to normative and the body text format has been subdivided by adding clauses.

ISO 4674 consists of the following parts, under the general title Rubber- or plastics-coated fabrics — Determination of tear resistance:

• Part 1: Constant rate of tear methods
• Part 2: Ballistic pendulum method

Introduction

Tearing is amongst the more usual ways of destruction for many thin materials such as paper, coated or uncoated textiles, plastic films and leather. Knowledge of the resistance of these materials to this type of behaviour is therefore very important.

In practice, tearing can result from very different circumstances; hence the large number of test methods that have been developed in order to predict the behaviour of materials in various situations.

The ISO 4674 series deals with initiated tearing, i.e. the propagation of a tear from an initiating cut.

This part of ISO 4674 describes two methods using a tensile-testing machine at constant rate of elongation. ISO 4674-2 describes a dynamic method using the kinetic energy of a falling pendulum.

1 Scope

This part of ISO 4674 specifies two methods for determining the forces necessary to initiate and propagate tearing of a coated fabric using the constant rate of tear method. The methods described are the following:

• method A: tongue tear;
• method B: trouser tear.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. 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

For the purposes of this document, the following terms and definitions apply.