IS 6213 : Part 22 : 2024/ISO 3688 : 2022 Methods of Test for Pulp - Part 22 Preparation of Laboratory Sheets for the Measurement of Optical Properties
NATIONAL FOREWORD
This Indian Standard (Part 22) which is identical to ISO 3688 : 2022 'Pulps - Preparation of laboratory sheets for the measurement of optical properties' issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the Paper and its Products Sectional Committee and approval of the Chemical Division Council.
For obtaining good quality paper, it is essential that the pulp which goes into the manufacture of paper is properly cooked and bleached. To forecast the optical properties of the paper to be produced from pulp and to compare optical properties of different type of pulps, it is essential to carry out optical tests on sheets of pulps. For the test to be reproducible and comparable, it is essential that pulps are subjected to exactly the same procedure for sheet making treatments before undergoing these tests.
ISO has published test method standards related to paper, pulp and board under three broad categories namely 'Paper, board and pulps', 'Paper and board' and 'Pulps'. Related Indian Standards published in IS 1060 (Parts 1, 2 and 3) 'Methods of sampling and test for paper and allied products' and IS 6213 series of standards published for 'Methods of test for pulps' are widely recognized and used in India. To maintain consistency with the prevailing international practices and to retain the existing test methods series, the committee responsible for formulating this standard decided to harmonize the methods of tests prescribed in IS 1060 series and IS 6213 series with those published by ISO and publish these adopted test methods standards in subsequent parts/ sections of IS 1060 series or IS 6213 series.
This Part of IS 6213 specifies two procedures for preparation of laboratory sheets for measuring optical properties for all wood pulps and other types of pulps. The other parts of IS 6213 are:
Part 1 Water solubility of pulp
Part 2 Determination of freeness of pulp
Part 3 Determination of alpha, beta and gamma cellulose in pulp
Part 4 Determination of viscosity of pulp
Part 5 Solubility of pulp in one percent caustic soda solution
Part 6 Copper number of pulp
Part 8 Preparation of laboratory sheets for physical testing:
Sec 1 Conventional sheet-former method (first revision)
Sec 2 Rapid-Köthen method
Part 9 Bleach requirements and preparation of hand sheets for optical tests of pulp
Part 10 Determination of kappa number (first revision)
Part 11 Determination of acid-insoluble ash (first revision)
Part 12 Determination of calcium content (first revision)
Part 13 Determination of copper content (first revision)
Part 14 Determination of iron content (first revision)
Part 15 Determination of manganese content (first revision)
Part 16 Dirt count
Part 17 Determination of saleable mass of pulp
Part 18 Pulp - Determination of chlorine consumption (Degree of delignification) (first revision)
Part 19 Determination of alkali solubility of pulp
Part 20 Determination of alkali resistance of pulp
Part 21 Paper, board and pulps -Determination of dry matter content - Oven-drying method (first revision)
Considering the benefits of aligning standard with that of international standards, the Committee decided to prepare this standard by identical adoption of ISO 3688 'Pulps - Preparation of laboratory sheets for the measurement of optical properties' under dual numbering.
The text of ISO Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:
a) Wherever the words 'International Standard' appear referring to this standard, they should be read as 'Indian Standard'; and
b) Comma (,) has been used as a decimal marker, while in Indian Standards, the current practice is to use a point (.) as the decimal marker.