AS/NZS 1301.423rp:1997

Australian/New Zealand Standard

Methods of test for pulp and paper Method 423rp: Folding strength of paper—Kohler-Molin method This is a free 7 page sample. Access the full version online. AS/NZS 1301.423rp:1997

This Joint Australian/New Zealand Standard was prepared by Joint Technical Committee PK/19, Methods of Test for Pulp and Paper. It was approved on behalf of the Council of Standards Australia on 1 August 1997 and on behalf of the Council of Standards New Zealand on 7 July 1997. It was published on 5 September 1997.

The following interests are represented on Committee PK/19: Australian Government Analytical Laboratories Australian Government Publishing Service CSIRO —Division of Forestry and Forest Products National Association of Forest Industries New Zealand Forest Research Institute New Zealand Pulp and Paper Industry Association Printing and Allied Trades Employers Federation of Australia Pulp and Paper Manufacturers Federation of Australia The Technical Association of the Australian and New Zealand Pulp and Paper Industry (APPITA)

Additional interests participating in preparation of Standard: Paper manufacturers Pulp manufacturers Research interests Manufacturers of paper testing instruments Suppliers of paper testing instruments

Review of Standards. To keep abreast of progress in industry, Joint Australian/ New Zealand Standards are subject to periodic review and are kept up to date by the issue of amendments or new editions as necessary. It is important therefore that Standards users ensure that they are in possession of the latest edition, and any amendments thereto. Full details of all Joint Standards and related publications will be found in the Standards This is a free 7 page sample. Access the full version online. Australia and Standards New Zealand Catalogue of Publications; this information is supplemented each month by the magazines ‘The Australian Standard’ and ‘Standards New Zealand’, which subscribing members receive, and which give details of new publications, new editions and amendments, and of withdrawn Standards. Suggestions for improvements to Joint Standards, addressed to the head office of either Standards Australia or Standards New Zealand, are welcomed. Notification of any inaccuracy or ambiguity found in a Joint Australian/New Zealand Standard should be made without delay in order that the matter may be investigated and appropriate action taken.

This Standard was issued in draft form for comment as DR 95333. AS/NZS 1301.423rp:1997

Australian/New Zealand Standard

Methods of test for pulp and paper Method 423rp: Folding strength of paper—Kohler-Molin method

Originated in Australia as AS P1.P423m—1962. Previous Australian edition AS 1301.423rp— 1989. Originated in New Zealand as Appita P423ts— 1960. Previous New Zealand edition NZS 1301.423rp— 1989. Jointly revised and designated AS/NZS 1301.423rp:1997. This is a free 7 page sample. Access the full version online.

PUBLISHED JOINTLY BY:

STANDARDS AUSTRALIA 1 The Crescent, Homebush NSW 2140 Australia STANDARDS NEW ZEALAND Level 10, Radio New Zealand House, 155 The Terrace, Wellington 6001 New Zealand ISBN 0 7337 1390 4 AS/NZS 1301.423rp:1997 Contents Page

1 Scope...... 1

2 Normativereferences...... 1

3 Definitions...... 1

4 Principle ...... 1

5 Apparatus...... 2

6 Preparationoftestpieces...... 2

7 Procedure...... 2

8 Calculation...... 3

9 Report...... 3

Annexes

A Care and maintenance of the Kohler-Molin folding strength tester ...... 5

B Bibliography...... 6 This is a free 7 page sample. Access the full version online.

ii AS/NZS 1301.423rp:1997 Foreword

This standard was prepared by Joint Technical Committee PK/19, Methods of Test for Pulp and Paper, as a part of AS/NZS 1301, Methods of test for pulp and paper.

This edition cancels and replaces AS 1301.423rp—1989 and NZS 1301.423rp—1989. The title has been changed from ‘Folding endurance of paper —Kohler-Molin method’ to ‘Folding strength of paper —Kohler-Molin method’.

This revision permits the reporting of results as the mean of the number of double folds or as folding endurance.

Since 1986 the ‘P’ has been omitted from the AS 1301 number identification; but, until all AS 1301 standards are reprinted the ‘P’ will continue to appear in some of them.

Annex A forms an integral part of this standard. Annex B is for information only. This is a free 7 page sample. Access the full version online.

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iii AS/NZS 1301.423rp:1997 Introduction

This standard prescribes the procedure to be used to determine the folding strength of paper by means of a Kohler-Molin folding strength tester. Folding strength can be reported as folding endurance defined as the logarithm (to the base 10) of the number of double folds required to cause rupture in a strip of paper 15 mm wide tested under a defined tension. Alternatively, folding strength may be reported as the mean of the number of double folds.

This standard conforms to ISO 5626:1993, but the ISO standard also includes the use of Schopper and MIT instruments and allows a wider tolerance on tension. The ISO standard requires that fold test results be reported either as folding endurance or as fold number, which is defined as the antilogarithm of the folding endurance. The ISO fold number and the AS/NZS mean of the number of double folds generally do not have the same value.

A similar standard is SCAN P17:77. This is a free 7 page sample. Access the full version online.

iv AS/NZS 1301.423rp:1997 Folding strength of paper—Kohler-Molin method

1Scope

This standard prescribes the procedure to be used to determine the folding strength of paper, measured as either folding endurance or the mean of the number of double folds, using a Kohler-Molin folding strength tester.

2 Normative references

The following standards contain provisions which, through reference in this text, constitute provisions of AS/NZS 1301.423rp. At the time of publication, the editions indicated were valid. All standards are subject to revisions, and parties to agreements based on AS/NZS 1301.423rp are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.

AS 1301.P414m—1986, Conditioning of paper for testing 1301.P415m—1985, Standard atmosphere for paper testing

3 Definitions

For the purpose of this standard the definitions below apply.

3.1 double fold: One complete oscillation of the test piece, during which it is folded backwards and forwards once about the same line.

3.2 folding endurance: The logarithm (to the base 10) of the number of double folds required to break a test piece when tested under a standard stress.

NOTE 1 — According to this standard the results of the folding strength test can be expressed either as folding endurance or as the mean of the number of double folds. In the ISO method results can be expressed either as folding endurance or fold number, which is the antilogarithm of the folding endurance. The mean of the number of double folds and the fold number generally will not have the same value. This is a free 7 page sample. Access the full version online. 3.3 machine direction folding strength: The test result obtained using test pieces with their long dimension in the machine direction.

3.4 cross-direction folding strength: The test result obtained using test pieces with their long dimension in the cross-direction.

4 Principle

A paper sample is folded backwards and forwards about the same line until it breaks, and the number of double folds completed is recorded.

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