ISO 12625-17:2021 Tissue paper and tissue products —Part 17: Determination of disintegration in water

标准简介

Tissue paper and tissue products —Part 17: Determination of disintegration in water由国际标准化组织(International Organization for Standardization，简称ISO)于2021-04发布，适用于世界范围。

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Tissue paper and tissue products —

Part 17: Determination of disintegration in water

1 Scope

This document specifies a method to assess the disintegration of tissue paper and tissue products when subjected to mechanical agitation in water.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

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

ISO 187, Paper, board and pulps — Standard atmosphere for conditioning and testing and procedure for monitoring the atmosphere and conditioning of samples

1)

ISO 638-1 , Paper, board, pulps and cellulosic nanomaterials — Determination of dry matter content by oven-drying method — Part 1: Materials in solid form

ISO 3310-1, Test sieves — Technical requirements and testing — Part 1: Test sieves of metal wire cloth

ISO 3310-2, Test sieves — Technical requirements and testing — Part 2: Test sieves of perforated metal plate

ISO 14487, Pulps — Standard water for physical testing

3 Terms a nd definiti ons

For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https://w ww .iso. org/ obp

— IEC Electropedia: available at http:// www .electropedia. org/ 3.1

disintegration

process that is characterized by a material breaking into small pieces in water under specified conditions

4 Principle

A test piece of tissue paper or tissue product is placed in a beaker and is agitated in water using an impeller rotating at a constant speed for time durations of 30 s, 2 min and 10 min. After agitation, the beaker contents are poured into a specified sieve, and if there are remains on the sieve, they are 1) Under preparation. Stage at the time of publication: ISO/FDIS 638-1.

collected and analysed gravimetrically to determine the percentages of disintegration after each agitation time period. Precision data are available in Annex D.

5 Reagents

5.1 Deionized water at 23 °C ± 0,5 °C, with a conductivity ≤ 0,25 mS/m at 25 °C, in accordance with ISO 14487.

6 Apparatus

6.1 Transparent beaker with a flat bottom, internal diameter 98 mm ± 5 mm, total height ≥ 150 mm.

6.2 Graduated cylinder, beaker, or other suitable container, having enough capacity to accurately measure and contain 600 ml ± 10 ml of water.

6.3 Stopwatch, with an accuracy of 0,1 s.

6.4 Agitating device with a rotation speed of 800 r/min ± 20 r/min, equipped with a polytetrafluoroethylene (PTFE) screw-propeller. The technical description of the propeller is given in Annex A, Figure A.1.

6.5 Stainless-steel test sieve, conforming to ISO 3310-2, 200 mm in diameter and height 50 mm, with perforated plate with round holes 12,5 mm in diameter.

NOTE Example and picture of typical, suitable and commercially available sieve is given in Annex B, Figure B.4.

6.6 Drying oven capable of maintaining a constant air temperature of 105 °C ± 2 °C, suitably ventilated, and capable of maintaining 80 °C ± 2 °C when test pieces are submitted to accelerated ageing.

6.7 Analytical balance with an accuracy of 0,001 g.

6.8 Drying pans.

6.9 Forceps.

6.10 Desiccator.

6.11 Shower head of diameter 70 mm ± 5 mm, having 50 ± 5 holes of diameter 1,0 mm ± 0,2 mm, attached to a faucet (tap) with a regulator adjusted to deliver 4,0 l/min ± 0,5 l/min.

NOTE Examples and pictures of typical, suitable and commercially available shower head types are given in Annex B.

7 Conditioning of test pieces

Conditioning shall be done prior to the preparation of test pieces, according to ISO 187.

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