ISO 14678:2005 接着剤—流れに対する抵抗の決定（たるみ） | ページ 2

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 14678 was prepared by the European Committee for Standardization (CEN) in collaboration with Technical Committee ISO/TC 61, Plastics, Subcommittee SC 11, Products, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).

Throughout the text of this document, read"...this European Standard..." to mean"...this International Standard...".

Introduction

When an adhesive joint is prepared, it is important that the applied adhesive does not flow away from the area of the joint. Flow can occur before the joint has been assembled, e.g. before solvent or water has evaporated, or after the joint has been closed, but before the adhesive has set, e.g. during the curing, solidification, or drying process.

The flow of an applied adhesive will be influenced by the stress applied and the duration and temperature of the bonding process. The extent of flow of an adhesive will also be influenced by the surface energies involved and the degree of roughness of the adherents. The occurrence of flow under gravity is called sagging (see Clause 3).

This European Standard describes three types of test for the assessment of sagging. In the first type of test, which simulates the conditions before joint assembly, the extent of flow of an adhesive down a surface which is either vertical (Methods 1, 2 and 3) or at 60° to the horizontal (Method 4) is measured. In the second type of test, which simulates conditions after assembly (Methods 5 and 6), the flow of adhesive from a hole or slot is observed. The third type of test simulates conditions during the cure cycle for structural film adhesives (Method 7). The method appropriate to the type of adhesive and its consistency should be selected.

1 Scope

This European Standard describes seven methods for the assessment of the flow characteristics of adhesives after application at room temperature and during cure, by the measurement of sagging. These methods may be used both for specifying an adhesive and for quality control purposes.

2 Normative references

The following referenced documents are indispensable for the application 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

For the purposes of this European Standard, the terms and definitions given in EN 923:1998 together with the following apply.