ISO 12777-2:2000 パレットジョイントのテスト方法—パート2：パレットの釘とステープルの引き抜き抵抗とヘッドプルスルー抵抗の決定 | 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 3.

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 part of ISO 12777 may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.

International Standard ISO 12777-2 was prepared by Technical Committee ISO/TC 51, Pallets for unit load method of materials handling.

ISO 12777 consists of the following parts, under the general title Methods of test for pallet joints:

• Part 1: Determination of bending resistance of pallet nails, other dowel-type fasteners and staples
• Part 2: Determination of withdrawal and head pull-through resistance of pallet nails and staples
• Part 3: Determination of pallet joint strength

Introduction

In 1988 ISO/TC 51 considered developing standard test methods for pallet joints. It became evident that the lack of International Standards on nail testing meant that fasteners (essential elements of pallet joints) could not be characterized sufficiently to enable worthwhile progress on full joint testing. Although there were existing, or partially developed, nail testing principles, it was considered that, in a practical situation where, for quality control purposes or comparisons of nail quality, reasonably accurate and rapid nail strength data were required, one or both, of the two existing commercial nail testers were better suited to the needs of pallet makers, pallet test laboratories and nail manufacturers. This is now ISO 12777-1.

Preliminary work led the manufacturers of both machines to make design modifications to improve accuracy. An evaluation, carried out with the cooperation of the manufacturers/agents of each nail test machine, demonstrated that the technical requirements for nail test machines/principles were met by both machines. The principles of these test methods are given in ISO 12777-1. They are primarily concerned with pallet joints in shear configuration.

This part of ISO 12777 extends the possibility of characterizing nails with relation to their axial configuration and the methods involve standard laboratory testing equipment. However, these tests are more complex than those in part 1 and are not suitable for routine quality control of pallets or pallet joints. Additionally, the highly significant influence of delayed testing must be considered in all parts of ISO 12777. Values of strength frequently increase even a few days after wood joint assembly and delayed testing may be more relevant to long-term pallet usage.

1 Scope

This part of ISO 12777 specifies methods of determining the resistance of pallet nails and staples to axial load by specifying test methods for determining:

• a) characteristics and maximum load for axially loaded nailed or stapled joints (wood to wood);
• b) characteristics and maximum load for axially loaded nailed or stapled joints (for wood to wood-based materials and wood to non-wood-based materials, such as plastics).

These test methods apply to joints with all types of nails up to 7 mm in diameter (including plain round shank, square, fluted, twisted, helical and annular threaded) and may also be suitable for other fasteners such as wood staples.

2 Normative references

The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of ISO 12777. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of ISO 12777 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards.

3 Terms and definitions

For the purposes of this part of ISO 12777, the nail and staple terminology given in ISO 445:1996 and the following terms and definitions apply. Other symbols are shown in Table 1.

Bibliography