SIST EN ISO 5263-3:2023
(Main)Pulps - Laboratory wet disintegration - Part 3: Disintegration of mechanical pulps at ≥ 85°C (ISO 5263-3:2023)
Pulps - Laboratory wet disintegration - Part 3: Disintegration of mechanical pulps at ≥ 85°C (ISO 5263-3:2023)
This document specifies an apparatus and the procedures for the laboratory wet disintegration of mechanical pulps that exhibit latency except when brightness is measured. This apparatus and procedure can be used for preparation of the test portion in other International Standards dealing with pulps.
This document is applicable to all kind of mechanical pulps (i.e. mechanical, semi-chemical and chemi-mechanical pulps) exhibiting latency.
Faserstoffe - Nassaufschlagen im Labor - Teil 3: Aufschlagen von Holzstoff bei ≥ 85 °C (ISO 5263-3:2023)
Dieses Dokument legt ein Gerät und die Verfahren zum Nassaufschlagen von Holzstoffen mit Latenz im Labor fest. Es gilt nicht für Fälle, in denen der Weißgrad gemessen wird. Das Gerät und das Verfahren kann auch zur Vorbereitung von Prüfmengen in anderen Internationalen Normen zum Thema Faserstoffe verwendet werden.
Dieses Dokument ist für alle Holzstoffarten (d. h. Holzstoffe, Halbzellstoffe und chemische Holzstoffe) mit Latenz anwendbar.
Pâtes - Désintégration humide en laboratoire - Partie 3: Désintégration des pâtes mécaniques à une température supérieure ou égale à 85 °C (ISO 5263-3:2023)
Le présent document spécifie un appareillage et les modes opératoires pour la désintégration humide en laboratoire des pâtes mécaniques qui présentent une latence, excepté lorsque le degré de blancheur est mesuré. Cet appareillage et ce mode opératoire peuvent être utilisés pour la préparation de la prise d’essai dans d’autres Normes internationales portant sur les pâtes.
Le présent document est applicable à tous les types de pâtes mécaniques (à savoir pâtes mécaniques, mi-chimiques et chimico-mécaniques) présentant une latence.
Vlaknine - Laboratorijsko razvlaknjevanje v mokrem - 3. del: Razvlaknjevanje mehanskih vlaknin pri ≥ 85°C (ISO 5263-3:2023)
Ta dokument določa napravo in postopke za laboratorijsko mokro razvlaknjevanje mehanske celuloze, ki kaže zgubanost, razen če je izmerjena svetlost. Ta naprava in postopek se lahko uporabljata za pripravo testnih količin v drugih mednarodnih standardih, ki obravnavajo celulozo.
Dokument se uporablja za vse vrste mehanske celuloze (tj. mehanska, polkemična in kemično-mehanska celuloza), ki izkazuje zgubanost.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 5263-3:2023
01-junij-2023
Nadomešča:
SIST EN ISO 5263-3:2005
Vlaknine - Laboratorijsko razvlaknjevanje v mokrem - 3. del: Razvlaknjevanje
mehanskih vlaknin pri ≥ 85°C (ISO 5263-3:2023)
Pulps - Laboratory wet disintegration - Part 3: Disintegration of mechanical pulps at ≥
85°C (ISO 5263-3:2023)
Faserstoffe - Nassaufschlagen im Labor - Teil 3: Aufschlagen von Holzstoff bei ≥ 85 °C
(ISO 5263-3:2023)
Pâtes - Désintégration humide en laboratoire - Partie 3: Désintégration des pâtes
mécaniques à une température supérieure ou égale à 85 °C (ISO 5263-3:2023)
Ta slovenski standard je istoveten z: EN ISO 5263-3:2023
ICS:
85.040 Vlaknine Pulps
SIST EN ISO 5263-3:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 5263-3:2023
---------------------- Page: 2 ----------------------
SIST EN ISO 5263-3:2023
EN ISO 5263-3
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2023
EUROPÄISCHE NORM
ICS 85.040 Supersedes EN ISO 5263-3:2004
English Version
Pulps - Laboratory wet disintegration - Part 3:
Disintegration of mechanical pulps at 85°C (ISO 5263-
3:2023)
Pâtes - Désintégration humide en laboratoire - Partie 3: Faserstoffe - Nassaufschlagen im Labor - Teil 3:
Désintégration des pâtes mécaniques à une Aufschlagen von Holzstoff bei 85 °C (ISO 5263-
température supérieure ou égale à 85 °C (ISO 5263-
3:2023)
3:2023)
This European Standard was approved by CEN on 11 February 2023.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 5263-3:2023 E
worldwide for CEN national Members.
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SIST EN ISO 5263-3:2023
EN ISO 5263-3:2023 (E)
Contents Page
European foreword . 3
2
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SIST EN ISO 5263-3:2023
EN ISO 5263-3:2023 (E)
European foreword
This document (EN ISO 5263-3:2023) has been prepared by Technical Committee ISO/TC 6 "Paper,
board and pulps" in collaboration with Technical Committee CEN/TC 172 “Pulp, paper and board” the
secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by August 2023, and conflicting national standards shall
be withdrawn at the latest by August 2023.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 5263-3:2004.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 5263-3:2023 has been approved by CEN as EN ISO 5263-3:2023 without any
modification.
3
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SIST EN ISO 5263-3:2023
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SIST EN ISO 5263-3:2023
INTERNATIONAL ISO
STANDARD 5263-3
Second edition
2023-02
Pulps — Laboratory wet
disintegration —
Part 3:
Disintegration of mechanical pulps at
≥85°C
Pâtes — Désintégration humide en laboratoire —
Partie 3: Désintégration des pâtes mécaniques à une température
supérieure ou égale à 85 °C
Reference number
ISO 5263-3:2023(E)
© ISO 2023
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SIST EN ISO 5263-3:2023
ISO 5263-3:2023(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
© ISO 2023 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 5263-3:2023
ISO 5263-3:2023(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Apparatus . 2
5 Preparation of test portion . 2
6 Procedure .3
6.1 General . 3
6.2 Disintegration and latency removal . 3
6.3 Standard disintegrator . . 3
6.4 Circulation disintegrator . . 4
7 Test report . 4
Annex A (normative) Construction of the standard disintegrator . 6
Annex B (normative) Checking the standard disintegrator . 9
Annex C (normative) Circulation disintegrator .10
Annex D (informative) The effect of latency in mechanical pulps .11
Bibliography .13
iii
© ISO 2023 – All rights reserved
---------------------- Page: 9 ----------------------
SIST EN ISO 5263-3:2023
ISO 5263-3:2023(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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 6, Paper, board and pulps, in collaboration
with the European Committee for Standardization (CEN) Technical Committee CEN/TC 172, Pulp, paper
and board, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna
Agreement).
This second edition cancels and replaces the first edition (ISO 5263-3:2004), which has been technically
revised.
The main changes are as follows:
— the requirement to reduce the temperature of the suspension immediately following disintegration
has been made explicit.
A list of all parts in the ISO 5263 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
© ISO 2023 – All rights reserved
---------------------- Page: 10 ----------------------
SIST EN ISO 5263-3:2023
INTERNATIONAL STANDARD ISO 5263-3:2023(E)
Pulps — Laboratory wet disintegration —
Part 3:
Disintegration of mechanical pulps at ≥85°C
1 Scope
This document specifies an apparatus and the procedures for the laboratory wet disintegration
of mechanical pulps that exhibit latency except when brightness is measured. This apparatus and
procedure can be used for preparation of the test portion in other International Standards dealing with
pulps.
This document is applicable to all kind of mechanical pulps (i.e. mechanical, semi-chemical and chemi-
mechanical pulps) exhibiting latency.
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 638-1, Paper, board, pulps and cellulosic nanomaterials — Determination of dry matter content by
oven-drying method — Part 1: Materials in solid form
ISO 4119, Pulps — Determination of stock concentration
ISO 14487, Pulps — Standard water for physical testing
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
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
Note 1 to entry: 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 to entry: The degree of latency in a pulp is generally related to the consistency and energy applied during
the mechanical processing.
1
© ISO 2023 – All rights reserved
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SIST EN ISO 5263-3:2023
ISO 5263-3:2023(E)
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 1 to entry: In this document, the temperature for latency removal is stated to be not less than 85 °C.
4 Apparatus
The usual laboratory apparatus and, in particular, the following shall be used.
4.1 Disintegrator with heat supply or hot-water supply capable of maintaining a temperature
of ≥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 Reference [5]), the
disintegrator used shall be reported.
4.1.1 Standard disintegrator, in accordance with 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.
The procedure for checking the standard disintegrator is given in Annex B.
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, in accordance with Annex C. The disintegrator shall
have a supply of water of a temperature of between 90 °C and 95 °C.
There shall be a means of running the pump for short intervals of time. To prevent damage to the pump,
the pump shall not be run dry for more than 3 s.
4.2 Balance, capable of weighing with an accuracy of 0,2 g.
4.3 Water, standard water, as specified in ISO 14487, distilled water or tap water, depending on the
requirement in the procedure for which the disintegrated pulp will be used.
5 Preparation of test portion
If the pulp is wet or air-dry, determine the dry matter content in accordance with ISO 638-1. 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
...
SLOVENSKI STANDARD
oSIST prEN ISO 5263-3:2021
01-november-2021
Vlaknine - Laboratorijsko razvlaknjevanje v mokrem - 3. del: Razvlaknjevanje
mehanskih vlaknin pri > 85 °C (ISO/DIS 5263-3:2021)
Pulps - Laboratory wet disintegration - Part 3: Disintegration of mechanical pulps at >
85°C (ISO/DIS 5263-3:2021)
Faserstoffe - Nassaufschlagen im Labor - Teil 3: Aufschlagen von Holzstoff bei ≥ 85 °C
(ISO/DIS 5263-3:2021)
Pâtes - Désintégration humide en laboratoire - Partie 3 : Désintégration des pâtes
mécaniques à une température supérieure ou égale à 85 degrés °C (ISO/DIS 5263-
3:2021)
Ta slovenski standard je istoveten z: prEN ISO 5263-3
ICS:
85.040 Vlaknine Pulps
oSIST prEN ISO 5263-3:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
oSIST prEN ISO 5263-3:2021
---------------------- Page: 2 ----------------------
oSIST prEN ISO 5263-3:2021
DRAFT INTERNATIONAL STANDARD
ISO/DIS 5263-3
ISO/TC 6 Secretariat: SCC
Voting begins on: Voting terminates on:
2021-09-10 2021-12-03
Pulps — Laboratory wet disintegration —
Part 3:
Disintegration of mechanical pulps at > 85°C
ICS: 85.040
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 5263-3:2021(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
©
PROVIDE SUPPORTING DOCUMENTATION. ISO 2021
---------------------- Page: 3 ----------------------
oSIST prEN ISO 5263-3:2021
ISO/DIS 5263-3:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved
---------------------- Page: 4 ----------------------
oSIST prEN ISO 5263-3:2021
ISO/DIS 5263-3:2021(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Apparatus . 2
5 Preparation of test portion . 2
6 Procedure. 3
6.1 Disintegration and latency removal . 3
6.2 Standard disintegrator . 3
6.3 Circulation disintegrator . 4
7 Test report . 4
Annex A (normative) Construction of the Standard Disintegrator . 6
Annex B (normative) Checking the Standard disintegrator . 8
Annex C (normative) Circulation disintegrator . 9
Annex D (informative) The effect of latency in mechanical pulps .10
Bibliography .12
© ISO 2021 – All rights reserved iii
---------------------- Page: 5 ----------------------
oSIST prEN ISO 5263-3:2021
ISO/DIS 5263-3:2021(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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC6 Paper, board and pulps.
This second edition cancels and replaces the first edition (ISO 5263-3:2004), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— The requirement to reduce the temperature of the suspension immediately following disintegration
has been made explicit.
A list of all parts in the ISO 5263 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2021 – All rights reserved
---------------------- Page: 6 ----------------------
oSIST prEN ISO 5263-3:2021
DRAFT INTERNATIONAL STANDARD ISO/DIS 5263-3:2021(E)
Pulps — Laboratory wet disintegration —
Part 3:
Disintegration of mechanical pulps at > 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 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 638-1, Paper, board, pulps and cellulosic nanomaterials — Determination of dry matter content by
oven-drying method — Part 1: Materials in solid form
ISO 4119, Pulps — Determination of stock concentration
ISO 14487, Pulps — Standard water for physical testing
3 Terms and definitions
For the purposes of this document, the following terms and 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
Note 1 to entry: 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 to entry: The degree of latency in a pulp is generally related to the consistency and energy applied during
the mechanical processing.
© ISO 2021 – All rights reserved 1
---------------------- Page: 7 ----------------------
oSIST prEN ISO 5263-3:2021
ISO/DIS 5263-3:2021(E)
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 1 to entry: In this part of ISO 5263, the temperature for latency removal is stated to be not less than 85 °C.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Apparatus
Ordinary laboratory apparatus and the following:
4.1 Disintegrator with heat supply or hot-water supply capable of maintaining a temperature of ≥ 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.Type text.
5 Preparation of test portion
If the pulp is wet or air-dry, determine the dry matter content in accordance with ISO 638 -1. 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.
2 © ISO 2021 – All rights reserved
---------------------- Page: 8 ----------------------
oSIST prEN ISO 5263-3:2021
ISO/DIS 5263-3:2021(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 x 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
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