ISO 801-2:1994 パルプ—ロット内の販売可能な質量の決定—パート2：スラブで梱包されたパルプ（フラッシュ乾燥パルプなど） | 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.

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.

International Standard ISO 801-2 was prepared by Technical Committee ISO/TC 6, Paper, board and pulps, Subcommittee SC 5, Test methods and quality specifications for pulp.

This second edition cancels and replaces the first edition (ISO 801-2:1979), of which it constitutes a technical revision.

ISO 801 consists of the following parts, under the general title Pulps — Determination of saleable mass in lots:

• Part 1: Pulp baled in sheet form
• Part 2: Pulps (such as flash-dried pulps) baled in slabs
• Part 3: Unitized bales

Annexes A and B of this part of ISO 801 are for information only.

Introduction

The extreme difficulty encountered in the cutting of wedges from thick slabs of pulp, such as flash-dried pulp, for which this test method has been designed, has led to the adoption of a disc sampling procedure, following an extensive investigation (practical and statistical) of the problem. A brief statement of this investigation is given in annex B.

It is recognized that, although the wedge system of sampling is, in theory, more accurate than the disc system, the drilling procedure specified in this part of ISO 801 may be regarded as satisfactory because, in practice, the moisture variation from place to place is relatively small (for example in flash-dried pulps).

1 Scope

This part of ISO 801 specifies a method for determining the dryness of a lot of pulp baled in slabs and for calculating its saleable mass.

This method is applicable to most kinds of pulp, in bales of approximately 200 kg, and made up of four to six slabs or wads, of fairly uniform and similar thickness. It may also be applicable to bales not composed of individual layers, but which are naturally delaminateable. It does not apply to pulp baled in sheet form or to pulp in unitized bales.

The method is not applicable if the drilling device becomes appreciably hot because of frictional heat evolved during drilling; this can occur with some strong chemical or semichemical pulps.

An example of a full certificate of analysis and related calculations is given in annex A.

2 Normative reference

The following standard contains provisions which, through reference in this text, constitute provisions of this part of ISO 801. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this part of ISO 801 are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and ISO maintain registers of currently valid International Standards.

3 Definitions

For the purposes of this part of ISO 801, the following definitions apply.