IS 14661 : Part 3 : Sec 1 : 2025/ISO 12625-3 : 2014 Tissue paper and Tissue products - Part 3 Methods of test - Section 1 Determination of thickness, bulking thickness and apparent bulk density and bulk
NATIONAL FOREWORD
This Indian Standard (Part 3/Sec 1) which is identical to ISO 12625-3 : 2014 'Tissue paper and tissue products - Part 3: Determination of thickness, bulking thickness and apparent bulk density and bulk' 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.
Thickness is an important property of tissue paper and tissue products. In the tissue industry, thicknessrelated parameters, such as the roll diameter of rolled products (kitchen towel) or the stack height of folded products (paper towels) are often measured.
The thickness of tissue paper and tissue products is known to be dependent on the pressure applied to the material at the time of measurement. Several different loading pressures, pressure-foot diameters and loading speeds have been used within the tissue industry.
The fact that not only end-use tissue products but also the base tissue paper from which these products are made is the subject of trade between companies and countries, means that there is a genuine need for a consistent measure of thickness that can be applied to tissue products at any stage of their manufacture.
ISO has published standards for vocabulary and methods of test for tissue paper and tissue products under the ISO 12625 series of standards. To align with international best practices and ensure consistency within the Indian context, the concerned sectional committee of BIS decided to harmonize the vocabulary and methods of test of tissue paper and tissue products with those published by ISO. The committee also decided to publish all the concerned standards under IS 14661 series, with its parts addressing specific aspects of tissue paper and tissue products as given below:
Part 1 Vocabulary
Part 2 Specification
Part 3 Methods of test
Part 3 of IS 14661 series is further subdivided into several sections, each addressing methods of test for specific parameters.
This section of IS 14661 (Part 3) provides a test method for the determination of thickness and bulking thickness and the calculation of apparent bulk density and bulk of tissue papers and tissue products under a pressure of 2.0 kPa. Other sections of IS 14661 (Part 3) are:
Sec 2 Determination of tensile strength, stretch at maximum force and tensile energy absorption
Sec 3 Determination of wet tensile strength
Sec 4 Determination of grammage
Sec 5 Determination of optical properties - Measurement of brightness and colour with D65/10° (outdoor daylight)
Sec 6 Water-absorption time and water-absorption capacity, basket-immersion test method
Sec 7 Determination of disintegration in water
The text of ISO standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions and terminologies 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.