EN ISO 5269-1:2000
(Main)Pulps - Preparation of laboratory sheets for physical testing - Part 1: Conventional sheet-former method (ISO 5269-1:1998)
Pulps - Preparation of laboratory sheets for physical testing - Part 1: Conventional sheet-former method (ISO 5269-1:1998)
This part of ISO 5269 specifies a method, using a conventional sheet former, for the preparation of laboratory sheets of pulp for the purpose of carrying out subsequent physical tests on these sheets in order to assess the relevant properties of the pulp itself. This part of ISO 5269 is applicable to most kinds of pulp. It is not suitable for some pulps with very long fibres, such as those made from unshortened cotton, flax and similar materials. This method is not suitable for the preparation of laboratory sheets for the determination of diffuse blue reflectance factor (ISO brightness) in accordance with ISO 3688.
Faserstoffe - Laborblattbildung für physikalische Prüfungen - Teil 1: Konventionelles Blattbildungsverfahren (ISO 5269-1:1998)
Dieser Teil der ISO 5269 legt ein Verfahren für die Blattbildung zur Herstellung von Laborblättern auf einem konventionellen Laborblattbildner fest. Die so hergestellten Laborblätter können anschließend physikalischen Prüfungen unterzogen werden, um die relevanten Eigenschaften des Faserstoffes zu bestimmen. Dieser Teil der ISO 5269 ist auf die Mehrzahl aller Faserstoffe anwendbar, eignet sich jedoch nicht für besonders langfaserige Faserstoffe, wie sie beispielsweise aus gekürzter Baumwolle, Flachs und ähnlichen
Rohstoffen hergestellt werden. Ferner ist dieses Verfahren nicht für die Herstellung von Laborblättern zur Bestimmung des diffusen blauen
Reflexionsfaktors (ISO-Weißgrad) nach ISO 3688 [1] geeignet.
Pâtes - Préparation des feuilles de laboratoire pour essais physiques - Partie 1: Méthode de la formette conventionnelle (ISO 5269-1:1998)
Vlaknine - Izdelava laboratorijskih listov za preskušanje fizikalnih lastnost - 1. del: Metoda na konvencionalnem oblikovalniku (ISO 5269-1:1998)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 5269-1:2000
01-december-2000
Vlaknine - Izdelava laboratorijskih listov za preskušanje fizikalnih lastnost - 1. del:
Metoda na konvencionalnem oblikovalniku (ISO 5269-1:1998)
Pulps - Preparation of laboratory sheets for physical testing - Part 1: Conventional sheet-
former method (ISO 5269-1:1998)
Faserstoffe - Laborblattbildung für physikalische Prüfungen - Teil 1: Konventionelles
Blattbildungsverfahren (ISO 5269-1:1998)
Pâtes - Préparation des feuilles de laboratoire pour essais physiques - Partie 1: Méthode
de la formette conventionnelle (ISO 5269-1:1998)
Ta slovenski standard je istoveten z: EN ISO 5269-1:2000
ICS:
85.040 Vlaknine Pulps
SIST EN ISO 5269-1:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
SIST EN ISO 5269-1:2000
---------------------- Page: 2 ----------------------
SIST EN ISO 5269-1:2000
---------------------- Page: 3 ----------------------
SIST EN ISO 5269-1:2000
---------------------- Page: 4 ----------------------
SIST EN ISO 5269-1:2000
---------------------- Page: 5 ----------------------
SIST EN ISO 5269-1:2000
---------------------- Page: 6 ----------------------
SIST EN ISO 5269-1:2000
INTERNATIONAL ISO
STANDARD 5269-1
Second edition
1998-08-01
Pulps — Preparation of laboratory sheets
for physical testing —
Part 1:
Conventional sheet-former method
Pâtes — Préparation des feuilles de laboratoire pour essais physiques —
Partie 1: Méthode de la formette conventionnelle
A
Reference number
ISO 5269-1:1998(E)
---------------------- Page: 7 ----------------------
SIST EN ISO 5269-1:2000
ISO 5269-1:1998(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.
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.
International Standard ISO 5269-1 was prepared by Technical Committee
ISO/TC 6, Paper, board and pulps, Subcommittee SC 5, Test methods and
quality specifications for pulp.
This second edition cancels and replaces the first edition (ISO 5269-1:1979),
of which it constitutes a technical revision.
ISO 5269 consists of the following parts, under the general title Pulps —
Preparation of laboratory sheets for physical testing:
— Part 1: Conventional sheet-former method
— Part 2: Rapid-Köthen method
Annex A of this part of ISO 5269 is for information only.
© ISO 1998
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet iso@iso.ch
Printed in Switzerland
ii
---------------------- Page: 8 ----------------------
SIST EN ISO 5269-1:2000
©
ISO ISO 5269-1:1998(E)
Introduction
It has been agreed that the ultimate aim of standardization of the
preparation of laboratory sheets should be to develop one method which is
internationally acceptable and which, if possible, permits the use of
different types of sheet-making apparatus.
For practical reasons, it has not proved possible to achieve this at present.
Therefore, as an interim measure, in view of the widespread use of
equipment described in this part of ISO 5269, it has been decided to
provide agreed guidance on the use of different types of equipment in order
to achieve consistency of results with each method.
To avoid creating too many levels of results, the method specified in this
part of ISO 5269 should preferably be used with the Valley beater or
PFI mill methods of laboratory beating according to ISO 5264-1 and
[3]
ISO 5264-2, respectively. The method specified in ISO 5269-2 (Rapid-
Köthen method) should preferably be used with the PFI mill or Jokro mill
[2]
methods of laboratory beating according to ISO 5264-2 and 5264-3 ,
respectively.
iii
---------------------- Page: 9 ----------------------
SIST EN ISO 5269-1:2000
---------------------- Page: 10 ----------------------
SIST EN ISO 5269-1:2000
©
INTERNATIONAL STANDARD ISO ISO 5269-1:1998(E)
Pulps — Preparation of laboratory sheets for physical testing —
Part 1:
Conventional sheet-former method
1 Scope
This part of ISO 5269 specifies a method, using a conventional sheet former, for the preparation of laboratory
sheets of pulp for the purpose of carrying out subsequent physical tests on these sheets in order to assess the
relevant properties of the pulp itself.
This part of ISO 5269 is applicable to most kinds of pulp. It is not suitable for some pulps with very long fibres, such
as those made from unshortened cotton, flax and similar materials.
This method is not suitable for the preparation of laboratory sheets for the determination of diffuse blue reflectance
[1]
factor (ISO brightness) in accordance with ISO 3688 .
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this part of
ISO 5269. At the time of publication, the editions indicated were valid. All standards are subject to revision, and
parties to agreements based on this part of ISO 5269 are encouraged to investigate the possibility of applying the
most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid
International Standards.
ISO 187:1990, Paper, board and pulps — Standard atmosphere for conditioning and testing and procedure for
monitoring the atmosphere and conditioning of samples.
ISO 3310-1:1990, Test sieves — Technical requirements and testing — Part 1: Test sieves of metal wire cloth.
ISO 5263:1995, Pulps — Laboratory wet disintegration.
ISO 5264-1:1979, Pulps — Laboratory beating — Part 1: Valley beater method.
ISO 5264-2:1979, Pulps — Laboratory beating — Part 2: PFI mill method.
ISO 5635:1978, Paper — Measurement of dimensional change after immersion in water.
ISO 8787:1986, Paper and board — Determination of capillary rise — Klemm method.
3 Principle
A circular, square or rectangular sheet is formed from a pulp suspension on a wire screen under suction. The sheet
is subjected twice to a pressure of 410 kPa. The sheet is dried in conditioned air and in contact with a drying plate,
to which it adheres so that it does not shrink.
1
---------------------- Page: 11 ----------------------
SIST EN ISO 5269-1:2000
©
ISO
ISO 5269-1:1998(E)
4 Equipment
4.1 Sheet former, consisting of three main parts.
comprising a stock container, with a mark located 350 mm 1 mm above a wire screen
4.1.1 Upper section, ±
(see 4.1.3). It is furnished with a rubber gasket to prevent leakage. The cross-section of the container shall be
circular, square or rectangular, and constant throughout the height. If the container is rectangular, the shorter side
shall be not less than 120 mm and the ratio of the longer to the shorter side shall not exceed 2,5. If the container is
circular, it shall be not less than 158 mm in diameter. It shall be of such height that water will not splash over the
edge when the stirrer (4.2) is operating.
4.1.2 Lower section, comprising a drainage vessel, consisting of an upper and a lower part. The upper part shall
have the same cross-section as the stock container (see 4.1.1), and its shape shall be such that the flow of liquid
through the wire screen is uniform over the whole area. The lower part may be of smaller cross-section but shall be
positioned symmetrically in relation to the upper part. The lower part shall be fitted with a valve, which is connected
to a draining pipe with a water seal at its lower end. The vertical distance from the top of the wire screen to the
overflow of the water seal shall be 800 mm ± 5 mm. The lower part and the drainage valve shall be large enough to
permit water in the stock container between the level mark and the wire screen to empty within 4,0 s ± 0,2 s. The
lower part of the drainage container shall be provided with a water inlet tube. The design shall incorporate a means
of releasing vacuum after the sheet has been formed.
4.1.3 Frame, with a perfectly flat, plain-woven metallic wire screen, to be placed horizontally between the upper
section (4.1.1) and the lower section (4.1.2). The screen shall be clean, undamaged and fitted without wrinkles and
corrugations. It shall have a nominal size of aperture of 125 μm, according to ISO 3310-1. The preferred diameter of
the wire shall be 90 μm with a permissible range between 77 μm and 104 μm. The wire screen is backed by a
coarser wire screen, which, in turn, may be backed by a rigid framework.
4.2 Stirrer, made of any non-corroding, rigid material, consisting of a perforated plate and furnished with vanes to
keep the plate parallel to the wire screen (see 4.1.3) and to minimize swirling during stirring. The total area of the
holes (diameter 10 mm to 20 mm) shall be about 30 % of the area of the plate; the holes shall be evenly spaced.
The dimensions of the plate shall be such that there is a clearance of 2 mm to 3 mm between the plate and the
stock container (see 4.1.1). All edges shall be rounded and smoothed to avoid the accumulation of fibres. The stirrer
shall also have a stop that maintains a distance of about 20 mm between the wire screen and the plate in its lowest
position.
An air agitation system may be used, provided that it produces bubbles of sufficient size and that they do not cling
to the fibres or cause pin-holes in the sheet.
NOTE — The following is an example of an agitation system. It uses compressed air and has at least eight inlet holes, each
with a diameter of 1,0 mm ± 0,2 mm and equally spaced (max. 70 mm) in the upper section (4.1.1). The distance between the
inlet holes and the wire screen is 10 mm ± 2 mm when the sheet former is operating. The inlet holes are connected to each
other by air channels, 8 mm in diameter, located parallel to the sides of the sheet former so that the depth of the inlet holes
(wall thickness) is 5 mm ± 2 mm. The air pressure is regulated to 100 kPa above atmospheric pressure. The agitation time is
5,0 s 0,5 s.
±
4.3 Couching equipment, comprising either
a) a couch weight having a plane bottom of the same area as the wire screen (see 4.1.3) and having a mass
corresponding to a pressure of between 1 kPa and 5 kPa on the surface of the laboratory sheet; or
b) an automatic couching system, comprising a diaphragm to which air pressure is applied; or
c) a couch roll (mass 13,0 kg, length 178 mm, diameter 102 mm) and a couch plate to protect the sheets.
Unless an automatic couching system is used, a couch plate shall be used to protect the sheet from distortion when
the couch weight is placed on it. The total mass of the couch plate and couch weight shall be within the limits given
above.
2
---------------------- Page: 12 ----------------------
SIST EN ISO 5269-1:2000
©
ISO
ISO 5269-1:1998(E)
4.4 Blotters, made of fully bleached chemical pulp or rag pulp, having neutral pH, and free from sizing agents,
chemical additives, visible contraries and fluorescent contaminant (see note 1). The blotters shall have the same
dimensions as the laboratory sheets or, if the laboratory sheets are circular, neither the length nor width of the
blotters shall be less than the sheet diameter nor shall the area of the blotters exceed that of the sheet by more than
35 %. If the sheets are square or rectangular, no blotter dimension in the plane of the blotter shall be less than the
corresponding sheet dimension nor shall the area of the blotters exceed that of the sheet by more than 35 %. The
2 2
grammage of the blotters shall be 250 g/m ± 25 g/m ; the Klemm absorbency, measured in accordance with
ISO 8787, shall be 70 mm ± 20 mm and the dimensional changes caused by soa
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.