preface
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ISO 12625-3, prepared by the Technical Committee CEN/TC 172 (Pulp, paper and board) of the European Committee for Standardisation (CEN) in cooperation with the Technical Committee ISO/TC 6 (paper, board and pulp) and Subcommittee SC 2 (Test methods and quality specifications for paper and board), Comply with the technical cooperation agreement between ISO and CEN (Vienna Agreement).

This second. Version cancels and replaces the technically revised first version (ISO 12625-3:2005).

For ISO 12625-3:2005, the following minor changes have been made:

a) The title has been changed; Add “bulk”;

b) The accuracy data in Annex A has been adjusted according to existing equipment capabilities and calibration procedures;

c) Prepare specimens with more accurate descriptions and reformulate 7.1 and 7.4;

d) Edit and update.

ISO 12625 consists of the following parts under the general heading Tissue Paper and household paper products

— Part 1: General guidance on articles;

— Part 3: Determination of thickness, expansion thickness, apparent bulk density and volume

— Part 4: Determination of tensile strength, tensile at break and tensile energy absorption;

— Part 5: Determination of wet tensile strength;

— Part 6: Determination of gram weight;

— Part 7: Determination of optical properties — Measurement of luminance and chroma (outdoor daylight) using D65/10°;

— Part 8: Water absorption time and capacity; Basket soaking test method;

— Part 9: Determination of blasting strength of the ball;

— Part 11: Determination of wet-bulb bursting strength;

— Part 12: Determination of tensile strength of perforated lines — calculation of perforating efficiency;

— Part 15 Determination of optical properties — Measurement of luminance and chroma using a C/2° (indoor daylight) light source;

— Part 16 Determination of optical properties — Opacity (paper backing) — diffuse reflection method

ISO 12625-3-2014 Tissue paper and tissue products – Part 3: Determination of thickness, expansion thickness and apparent bulk density and volume

introduce
Thickness is an important characteristic of household paper and household paper products.

In the household paper industry, thickness-related parameters are often measured, such as the diameter of rolls for rolled products (kitchen towels) or stack height for folded products (paper towels). However, not only end-use household paper products, but also the basic household paper from which these products are produced are also the subject of trade between companies and countries, which means that there is a real need for consistent thickness measurements that can be applied to household paper products at any stage of their manufacture.

It is well known that the thickness of tissue paper and tissue products depends on the pressure applied to the material at the time of measurement. The household paper industry has used several different loading pressures, pressure foot diameters, and loading speeds. This part of ISO 12625 was developed by harmonizing the standards applicable to tissues and tissue products currently in use. It specifies a single loading pressure, foot diameter and loading speed for all thickness measurements of tissue and tissue products.

It is clearly stated that tissue paper and tissue products should be tested for impurities and dents in accordance with ISO 15755.

ISO 287 or ISO 638 should be used to determine moisture content in tissue and household paper products.

1 range
This part of ISO 12625 specifies a test method for determining thickness and expansion thickness, as well as calculating the apparent bulk density and volume of tissue and household paper and tissue paper products at a pressure of 2,0 kPa.

Note that this part of ISO 12625 is intended to provide a consistent test method for determining the thickness and density of tissue paper and tissue products. ISO 534 covers the corresponding test methods for paper and board.

2 Normative references
All or part of the following documents are referred to normatively in this document and are not available for their use. For dated references, citation-only versions apply. For undated references, the new version of the reference (including any revisions) applies.

ISO 186, Paper and board — Sampling to determine average quality

ISO 187, Paper, board and pulp — Standard atmospheres for conditioning and testing and procedures for monitoring sample atmospheres and conditioning

ISO 12625-1, tissue and household paper products – Part 1: General guidance on terminology

ISO 12625-6, Tissue paper and tissue products – Part 6: Determination of gram weight

ISO 12625-3-2014 Tissue paper and tissue products – Part 3: Determination of thickness, expansion thickness and apparent bulk density and volume

3 Terms and Definitions
For the purposes of this document, the terms and definitions set forth in ISO 12625-1 and below apply.

3.1 Thickness of single layer

The distance between the two main surfaces of a single layer of tissue paper measured under static load applied as specified in this part of ISO 12625

Note 1: A tissue “layer” is an unlaminated tissue, like tissue made directly from a toilet paper mechanism.

3.2 Sheet thickness

The distance between the two main surfaces of a single paper towel product measured under the applied static load specified in this part of ISO 12625

Note 1: Tissue “sheets” are laminated or unlaminated tissue, as present in finished paper towel products.

3.3 Expansion thickness

The thickness of a single sheet of tissue paper or tissue product, calculated from the thickness of several sheets of superimposed paper, is measured under the applied static load specified in this part of ISO 12625

3.4 Apparent packing density

The quality of tissue paper or tissue product per unit volume, calculated according to its gram weight and expanded thickness

Note 1: Apparent packing density is expressed in grams per cubic centimeter.

3.5 Bulk

Apparent specific volume

Reciprocal density

Note 1: Volume is expressed in cubic centimeters per gram.

3.6g

The mass per unit area of tissue paper or tissue paper products as determined by the procedure in ISO 12625-6

Note 1 Entry: The gram weight of the entry is expressed in grams per square meter (g/m 2).

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