AS/NZS 1301.426S:1994

1 - AS/NZS 1301.426s:1994 DETERMINATION OF THICKNESS AND APPARENT BULK DENSITY OR APPARENT SHEET DENSITY
1 - PREFACE
3 - 1 Scope
3 - 2 Normative references
3 - 3 Definitions
3 - 3.1 single sheet thickness:
3 - 3.2 bulking thickness:
3 - 3.3 apparent bulk density:
3 - 3.4 apparent sheet density:
3 - 4 Principle
3 - 5 Apparatus
3 - 5.1 Dead-weight micrometer
4 - 5.2 Thickness gauges
4 - 6 Sampling
4 - 7 Conditioning
4 - 8 Preparations of test pieces
4 - 8.1 Bulking thickness
4 - 8.2 Single sheet thickness
4 - 9 Procedure
4 - 9.1 Verification and calibration of micrometer
4 - 9.2 Determinations
5 - 9.2.1 Determination of thickness
5 - 9.2.2 Determination of apparent density
5 - 10 Expression of results
5 - 10.1 Bulking thickness
5 - 10.2 Single sheet thickness
5 - 10.3 Apparent density
5 - 10.3.1 Apparent bulk density
5 - 10.3.2 Apparent sheet density
6 - 11 Precision
6 - 11.1 Repeatability
6 - 11.1.1 Bulking thickness
6 - 11.1.2 Single sheet thickness
6 - 11.2 Reproducibility
6 - 11.2.1 Bulking thickness
6 - 11.2.2 Single sheet thickness
6 - 12 Test report
8 - Annex A - Verification of micrometer performance and calibration
8 - A.1 General
8 - A.2 Pressure exerted between pressure faces
8 - A.3 Indication error and repeatability of measurement
8 - A.4 Parallelism of pressure faces

Specifies two methods of measuring the thickness of paper and board and of calculating the apparent sheet density from the thickness determinations. This Standard is based on ISO 534:1988 and incorporates amendments which provide that the ISO preferred pressure between the faces be mandatory and allow the Standard to be applied to corrugated fibreboard.

This International Standard specifies two methods of measuring the thickness of paper and board and of calculating the apparent bulk density or the apparent sheet density from the thickness determinations. The methods area) measurement of single sheets of paper or board (single sheet thickness);b) measurement of a pack of sheets of paper of grammage up to 224 g/m2(bulking thickness).Method b) is applicable to corrugated fibreboard. Neither method is applicable to certain soft papers such as tissues which are creped and/or embossed due to the slow or excessive compression which takes place when measurements are made on such materials.

First published as Appita P426-1960.
Appita P427m first published 1960.
Appita P426-1960 revised and redesignated as Appita P1.P426ts-1964.
Appita P427m-1960 revised and redesignated as Appita P1.P427ts-1964.
Appita P1.P426ts-1964 revised and redesignated AS P1.P426ts-1972.
Appita P1.P427ts-1964 revised and redesignated AS P1.P427ts-1972.
AS P1.P426ts-1972 revised and redesignated AS 1301.P426s-1978.
AS P1.P427ts-1972 revised and redesignated AS 1301.P427s-1978.
AS 1301.P426s-1978 revised and redesignated AS 1301.426s-1988.
AS 1301.P427s-1978 revised and redesignated AS 1301.427s-1988.
AS 1301.426s-1988 and AS 1301.427s-1988 jointly revised and designated as Joint Standard AS/NZS 1301.426s:1994.