ISO 5263-3:2004

Pulps — Laboratory wet disintegration — Part 3: Disintegration of mechanical pulps at > 85 degrees C

ISO 5263-3:2004 specifies an apparatus and the procedures for the laboratory wet disintegration of mechanical pulps that exhibit latency. This apparatus and procedure are required for preparation of the test portion in a number of other International Standards dealing with pulps. ISO 5263-3:2004 is applicable to all kind of mechanical pulps (i.e. mechanical, semi-chemical and chemo-mechanical pulps) exhibiting latency. Mechanical pulps not exhibiting latency shall be disintegrated according to ISO 5263-2. The procedure specified in ISO 5263-2 should be used to disintegrate all mechanical pulps to be measured for brightness.

Pâtes — Désintégration humide en laboratoire — Partie 3: Désintégration des pâtes mécaniques à une température supérieure ou égale à 85 degrés C

General Information

• Status: Withdrawn
• Publication Date: 06-Sep-2004
• ICS: 85.040 - Pulps
• Technical Committee: ISO/TC 6 - Paper, board and pulps
• Drafting Committee: ISO/TC 6 - Paper, board and pulps
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 08-Feb-2023

Relations

• Revised: ISO 5263-3:2023 - Pulps — Laboratory wet disintegration — Part 3: Disintegration of mechanical pulps at ≥85°C
• Effective Date: 23-Apr-2020
• Revises: ISO 5263:1995 - Pulps — Laboratory wet disintegration
• Effective Date: 15-Apr-2008
• Revised: SIST ISO 5263:1996 - Pulps -- Laboratory wet disintegration
• Effective Date: 12-May-2008

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 5263-3
First edition
2004-09-01


Pulps — Laboratory wet disintegration —
Part 3:
Disintegration of mechanical pulps at
WWWW 85 °C
Pâtes — Désintégration humide en laboratoire —
Partie 3: Désintégration des pâtes mécaniques à W 85 °C




Reference number
ISO 5263-3:2004(E)
©
ISO 2004

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ISO 5263-3:2004(E)
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ii © ISO 2004 – All rights reserved

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ISO 5263-3:2004(E)
Contents Page
Foreword. iv
1 Scope. 1
2 Normative references . 1
3 Definition. 1
4 Apparatus. 2
5 Preparation of test portion. 2
6 Procedure. 3
7 Test report. 4
Annex A (normative) Construction of the Standard disintegrator . 5
Annex B (normative) Checking the Standard disintegrator. 7
Annex C (normative) Circulation disintegrator . 8
Annex D (informative) The effect of latency in mechanical pulps. 9
Bibliography . 11

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ISO 5263-3:2004(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 5263-3 was prepared by Technical Committee ISO/TC 6, Paper, board and pulps, Subcommittee SC 5,
Test methods and quality specifications for pulps.
This first edition cancels and partially replaces ISO 5263:1995 which has been technically revised. In the
revision, ISO 5263 has been divided into three parts; Part 1 which is applicable to chemical pulps, Part 2
which is applicable to mechanical pulps without latency and Part 3 which is applicable to mechanical pulps
exhibiting latency. In Part 3, an informative Annex has been inserted describing the effect of latency in
mechanical pulps.
ISO 5263 consists of the following parts, under the general title Pulps — Laboratory wet disintegration:
— Part 1: Disintegration of chemical pulps
— Part 2: Disintegration of mechanical pulps at 20 °C
— Part 3: Disintegration of mechanical pulps at W 85 °C

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INTERNATIONAL STANDARD ISO 5263-3:2004(E)

Pulps — Laboratory wet disintegration —
Part 3:
Disintegration of mechanical pulps at WWWW 85 °C
1 Scope
This part of ISO 5263 specifies an apparatus and the procedures for the laboratory wet disintegration of
mechanical pulps that exhibit latency. This apparatus and procedure are required for preparation of the test
portion in a number of other International Standards dealing with pulps.
ISO 5263-3 is applicable to all kind of mechanical pulps (i.e. mechanical, semi-chemical and chemi-
mechanical pulps) exhibiting latency. Mechanical pulps not exhibiting latency shall be disintegrated according
to ISO 5263-2.
The procedure specified in ISO 5263-2 should be used to disintegrate all mechanical pulps to be measured for
brightness.
NOTE Brightness is not significantly altered by the presence of latency; however, hot disintegration of mechanical
pulps can lead to significant loss of brightness.
2 Normative references
The following referenced documents are indispensable for the application 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 638, Pulps — Determination of dry matter content
ISO 4119, Pulps — Determination of stock concentration
ISO 14487, Pulps — Standard water for physical testing
3 Definition
For the purposes of this part of ISO 5263, the following definitions apply.
3.1
disintegration of mechanical pulp
mechanical treatment in water so that interlaced fibres, which were free in the pulp stock, are again separated
from one another without appreciably changing their structural properties
3.2
latency
condition of a mechanical pulp in which some of its properties are inhibited and require disintegration of the
pulp at elevated temperature to be developed
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ISO 5263-3:2004(E)
NOTE 1 Latency is due to the distorted form of the fibres, acquired in mechanical processing, especially at high
consistency, and subsequently preserved upon cooling at high consistency. It is assumed that its preservation is caused
by the hardening of the lignin.
NOTE 2 The degree of latency in a pulp is generally related to the consistency and energy applied during the
mechanical processing.
3.3
latency removal
procedure using a combination of mechanical treatment, i.e. disintegration, and heat treatment using a
temperature exceeding the softening temperature of lignin
NOTE In this part of ISO 5263, the temperature for latency removal is stated to be not less than 85 °C.
4 Apparatus
Ordinary laboratory apparatus and the following:
4.1 Disintegrator with heat supply or hot-water supply capable of maintaining a temperature of W 85 °C in
the suspension during the entire disintegration procedure. Use either the Standard disintegrator (4.1.1) or the
Circulation disintegrator (4.1.2).
Since the two types of disintegrator do not treat the fibres in the same way (see [6]), the disintegrator used
must be reported.
4.1.1 Standard disintegrator, constructed as described in Annex A. For latency removal, the Standard
disintegrator shall be equipped with an electrically heated container or shall have a supply of hot water,
capable of keeping the temperature of the fibre-water suspension at the temperature stated in 4.1.
NOTE 1 The procedure for checking the Standard disintegrator is given in Annex B.
NOTE 2 For safety reasons, it is not recommended to use a Standard disintegrator intended for disintegration at 20 °C
and an electric hot plate for boiling water.
4.1.2 Circulation disintegrator, of Domtar type, constructed as described in Annex C. The disintegrator
shall have a supply of water of a temperature of between 90 °C and 95 °C.
There must be a means of running the pump for short intervals of time. To prevent damage to the pump, the
pump must not run dry for more than 3 s.
4.2 Balance, capable of weighing with an accuracy of 0,2 g.
4.3 Standard water, for physical testing, as specified in ISO 14487.
5 Preparation of test portion
If the pulp is wet or air-dry, determine the dry matter content in accordance with ISO 638. If the pulp is in slush
form, determine the dry matter content in accordance with ISO 4119.
If the concentration of a slush pulp sample is less than 1,5 % by mass, thicken it to the appropriate volume,
carefully avoiding the loss of fines. This is most easily done by sedimentation of the suspension and removing
a part of the water phase or by dewatering through a filter paper on a Büchner funnel.
Use standard water (4.3) for disintegrating pulps to be used in tests where drainability properties are of
importance. In all cases, use water of the same quality as required in the procedure for which the pulp is
disintegrated.
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ISO 5263-3:2004(E)
For the Standard disintegrator (4.1.1), take a test portion corresponding to a mass of (50 ± 5) g of oven-dry
pulp. For the Circulation disintegrator (4.1.2), take a test portion corresponding to a mass of (56 ± 1) g of
oven-dry pulp. If the sample is in sheet-form, do not cut the sheets and avoid taking cut edges.
If the dry matter comprises 20 % or more of the sample, soak the test portion in 1 l to 1,5 l of water (standard
water or other) at (20 ± 5) °C for at least the minimum soaking time specified in Table 1. If the pulp is in the
form of sheets or slabs, after soaking tear the sample into pieces of dimensions approximately
25 mm × 25 mm. Soaking for a time longer than the minimum specified, for example overnight, has been
found not to have any significant effect on the results. The soaking time shall, however, never be longer than
24 h for any pulp grade.
NOTE Flash-dried mechanical pulp needs to be soaked for a minimum of 10 min.
Table 1 — Recommended soaking time for mechanical pulps
Dry matter content of the pulp, Minimum soaking time
% by mass
< 20 0 min
20 to 60 30 min

> 60 4 h

Where necessary for climatic reasons, a temperature of between 25 °C and 30 °C may be used, provided that
this is stated in the test report.
6 Procedure
6.1 Disintegration and latency removal
WARNING — Since the hot-disintegration procedure involves the treatment of the test portion at a
temperature exceeding 85 °C, cautions must be taken to prevent scalding.
Information regarding the effect of latency in mechanical pulps (or in pulps having a high lignin content) is
given in Annex D.
6.2 Standard disintegrator
Transfer the test portion, a
...