ISO 5269-2:2004

INTERNATIONAL ISO
STANDARD 5269-2
Third edition
2004-11-01
Pulps — Preparation of laboratory sheets
for physical testing —
Part 2:
Rapid-Köthen method
Pâtes — Préparation des feuilles de laboratoire pour essais
physiques —
Partie 2: Méthode Rapid-Köthen

Reference number
©
ISO 2004
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ii © ISO 2004 – All rights reserved

Contents Page
Foreword. iv
Introduction . v
1 Scope. 1
2 Normative references. 1
3 Principle. 1
4 Equipment. 2
5 Pretreatment and preparation of sample. 5
5.1 Pretreatment. 5
5.2 Preparation of sample . 6
6 Procedure. 6
6.1 Sheet forming. 6
6.2 Transfer of the sheet. 6
6.3 Drying and conditioning. 7
7 Test report. 7
Bibliography . 8

Foreword
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(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
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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 5269-2 was prepared by Technical Committee ISO/TC 6, Paper, board and pulps, Subcommittee SC 5,
Test methods and quality specifications for pulps.
This third edition cancels and replaces the second edition (ISO 5269-2:1998), of which the Introduction,
Clauses 1, 2 and 7 and Subclause 5.1 have been revised.
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
iv © ISO 2004 – All rights reserved

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 PFI mill method of laboratory beating according to ISO 5264-2. The method specified in
ISO 5269-1 (Conventional sheet-former method) should preferably be used with the Valley beater or PFI mill
[2]
methods of laboratory beating according to ISO 5264-1 and 5264-2, respectively.

INTERNATIONAL STANDARD ISO 5269-2:2004(E)

Pulps — Preparation of laboratory sheets for physical testing —
Part 2:
Rapid-Köthen method
1 Scope
This part of ISO 5269 specifies a method, using a Rapid-Köthen 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
[1]
reflectance factor (ISO brightness) in accordance with ISO 3688 .
WARNING — When long-fibred pulp is used in the unshortened form, the sheet formation may not
always be satisfactory.
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 187, Paper, board and pulps — Standard atmosphere for conditioning and testing and procedure for
monitoring the atmosphere and conditioning of samples
ISO 4119, Pulps — Determination of stock concentration
ISO 5263-1, Pulps — Laboratory wet disintegration — Part 1: Disintegration of chemical pulps
ISO 5263-2, Pulps — Laboratory wet disintegration — Part 2: Disintegration of mechanical pulps at 20 °C
ISO 5263-3, Pulps — Laboratory wet disintegration — Part 3: Disintegration of mechanical pulps at W 85 °C
ISO 5264-2, Pulps — Laboratory beating — Part 2: PFI mill method
ISO 5269-1, Pulps — Preparation of laboratory sheets for physical testing — Part 1: Conventional sheet-
former method
3 Principle
A circular sheet is formed from a pulp suspension on a wire screen under suction. The sheet is subjected to
pressure and dried in a dryer, with almost complete prevention of shrinkage, in a specified way with respect to
the pressure applied, the suction and the temperature.
4 Equipment
4.1 Rapid-Köthen apparatus, consisting of a sheet former, transfer equipment, one or more dryers and
accessories (see Figure 1). The parts of the instrument which come into contact with stock or water shall be
corrosion resistant.
4.1.1 Sheet former, consisting of a stock container for preparing the pulp suspension, the screen section
on which wet fibre is forwarded, and the suction chamber for drawing off and holding the water after passing
through the screen. The lower part of the stock container, screen section and suction chamber may be sealed
off.
4.1.1.1 Stock container (see Figure 1)
The stock container consists of a transparent cylindrical tube (1) with an internal diameter of
200 mm ± 0,5 mm and a capacity of not less than 10 litres. The container is graduated in litres. Around the
circumference of the lower part of the stock container are two rows of holes (2), 1,5 mm in diameter, one
above the other, connecting radially to a circular cavity (3) round the outside of the cylinder. Each row
contains 40 holes. The distance between the screen surface and the lower row of holes is 10 mm, and the
space between the lower and upper rows is 7 mm. The lower row of holes is drilled horizontally and the upper
row is inclined upwards at an angle of 30° towards the centre of the cylinder.
The stock container is so constructed that it can be lifted off the screen section. The circular cavity can be
filled with water and compressed air.
4.1.1.2 Screen section
The screen section, which separates the stock container and the suction chamber, consists of the sheet-
forming screen (4) and the supporting screen (5).
The nickel sheet-forming screen gauze is evenly stretched over the ring and can be lifted off from the
supporting screen. The dimensions of the twilled sheet-forming screen gauze are as follows:
Number of warp wires: 60 wires/cm
Number of weft wires: 55 wires/cm
Wire diameter: 0,060 mm to 0,065 mm
The supporting screen gauze is evenly stretched over bars (6) having a width of 2 mm and a height of 30 mm
arranged parallel to one another and spaced 10 mm ± 2 mm apart. The two upper edges of each bar are
chamfered at an angle of 75° to the horizontal in such a way that a 0,5 mm wide ledge remains as a support
for the supporting screen. The supporting screen shall be exactly horizontally aligned.
The dimensions of the supporting screen gauze in simple plain weave, made from phosphor bronze are as
follows:
Number of warp wires: 8 wires/cm
Number of weft wires: 7 wires/cm
Wire diameter: 0,35 mm
4.1.1.3 Suction chamber
The suction chamber has a capacity of more than 10 litres, and has a water outlet (7) that can be closed. The
suction chamber can be connected
...