introduction
ISO (International Organization for Standardization) is a global alliance of national standards bodies (ISO member bodies). The development of international standards is usually carried out through ISO technical committees. Each member institution interested in a subject on which a technical committee has been established has the right to be represented on that committee. International governmental and non-governmental organizations liaising with ISO are also involved in this work. ISO works closely with the International Electrotechnical Commission (IEC) on all matters of electrical standardization.

International standards are drafted in accordance with the rules given in Part 2 of the ISO/IEC Directive.

The main task of the technical committee is to develop international standards. The draft international standard adopted by the Technical Committee will be circulated to the member bodies for voting. Publication as an international standard requires approval by at least 75% of member institutions.

Please note that certain elements of this document may be subject to patent rights. ISO is not responsible for identifying any or all such patents.

ISO 12625-12-2010 “Toilet paper and sanitary paper products – Part 12: Determination of tensile strength of perforation lines – Calculation of perforation efficiency”

ISO 12625-12 by the Technical Committee of the European Committee for Standardisation (CEN) CEN/TC 172 (Pulp, paper and board) in collaboration with the Technical Committee ISO/TC 6 (Paper, board and pulp), Subcommittee SC 2 (Test methods and quality specifications for paper and board), Prepared in accordance with the Technical Cooperation Agreement between ISO and CEN (Vienna Agreement).

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

– Part 1: General principles of terminology use

– Part 3: Determination of thickness, swelling thickness and apparent packing density

– 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

– Part 8: Water absorption time and capacity, basket soaking test method

– Part 9: Determination of the bursting strength of the ball

– Part 12: Determination of tensile strength of perforating lines – Calculation of perforating efficiency

ISO 12625-12-2010 “Toilet paper and sanitary paper products – Part 12: Determination of tensile strength of perforation lines – Calculation of perforation efficiency”

The following sections are under preparation:

– Part 13: Determination of spectral reflectance (luminance) at wavelength R 457 nm, with and without ultraviolet stimulation and opacity

introduce

Paper towels such as toilet paper and kitchen towels are usually pre-cut. They are used after separating two consecutive sheets of paper.

It is important to understand the efficiency of pre-cut perforation.

The perforation strength should be enough to ensure the cohesion of the product, but not too high, so that the sheet can be easily separated. Depending on the type of tissue product, the force can be applied perpendicular to or in the direction of the piercing line.

This part of ISO 12625 was prepared by harmonizing the standards applicable to tissue paper and tissue paper products currently in use. It specifies a procedure for determining perforation efficiency based on the method described in ISO 12625-4 for the determination of tensile strength of tissue paper and tissue paper products.

ISO 12625-12-2010 “Toilet paper and sanitary paper products – Part 12: Determination of tensile strength of perforation lines – Calculation of perforation efficiency”

1 Range
This part of ISO 12625 specifies a test method for determining the tensile strength of perforated lines of tissue paper. It uses tensile test equipment that operates at a constant elongation rate.

This method is only used to measure the tensile strength in the direction of the machine, i.e. for cross-direction perforations on tissue paper.

The calculation of perforation efficiency is also specified in this part of ISO 12625.

It is clearly stated that testing for impurities and impurities in tissue paper and tissue paper products can be carried out according to ISO 15755.

In order to determine the moisture content of tissue paper and household paper products, ISO 287 can be applied.

ISO 12625-12-2010 “Toilet paper and sanitary paper products – Part 12: Determination of tensile strength of perforation lines – Calculation of perforation efficiency”

2 Normative references
The following reference files are required for the application of this document. For dated references, only the cited version applies. For undated references, a 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 536, paper and board – Determination of gram weight

ISO 1924-2, Paper and board – Determination of tensile properties – Part 2: constant elongation method (20 mm/min)

ISO 7500-1, Metallic materials – Verification of static uniaxial testing machines – Part 1: Tensile/compression testing machines – Verification and calibration of force measuring systems

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

ISO 12625-12-2010 “Toilet paper and sanitary paper products – Part 12: Determination of tensile strength of perforation lines – Calculation of perforation efficiency”

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

3.1 Tensile strength S

In a tensile test, the maximum tensile force a specimen is subjected to per unit width before breaking

3.2 Punch Efficiency Ep

The difference in tensile strength between the non-perforated and the perforated material from the same sample divided by the tensile strength of the non-perforated material

Note 1: Performance efficiency is expressed as a percentage.

Note 2: The higher the perforation efficiency, the easier the sheet separation.

3.3 Pull Rod

Uncut area in the punch line

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