AS/NZS 1301.209:2017 pdf free

09-07-2021 comment

AS/NZS 1301.209:2017 pdf free.Methods of test for pulp and paper Method 209: Laboratory processing of pulp – PFI mill method.
4 Apparatus and auxiliary materials
Use ordinary laboratory equipment and the following.
4.1 PFI mill, as specified in Annex A.
See Annexes B and C.
4.2 Disintegrator, as specified in ISO 5263-1.
4.3 Balance capable of weighing the sample with an accuracy of at least 0,2 g.
4.4 Standard water, purified to have an electrical conductivity 0.25 mS/m at 25 C, as specified in ISO 14487.
4.5 A reference pulp. as described in Annex C, kept for beating-control purposes and stored for a sufficient time for the physical properties to stabilize. The reference pulp should, if possible. be of the same grade as that normally beaten in the beating equipment concerned. Since some pulp grades are not stable, it might be necessary to choose another grade.
To minimize a change in the pulp over time, the reference pulp should be kept at room temperature at a relative humidity range of 40 % to 60 % in a dark and dust-free place.
NOTE Stored under the recommended conditions, the reference pulp will, in most cases, be stable for approximately 10 years. Changes in the level of the tensile strength and tear strength values might be an indication that the reference pulp is no longer stable. The stability can be checked by measuring the viscosity of the reference pulp, e.g. twice a year.
5 Sampling
If the beating is being done to evaluate a lot of pulp, the sample shall be selected in accordance with
ISO 7213.
If the beating is done on another type of sample, report the source of the sample and, if possible, the sampling procedure used.
Select the test portions so that they are representative of the gross sample received.
6 Preparation of sample
If the sample is wet or air-dry, weigh a test portion br the determination of the dry-matter content in accordance with ISO 638. lIthe sample is in the form of an aqueous pulp suspension, determine the dry- matter content in accordance with ISO 4119.
Take a test portion of the sample corresponding to (30,0 ± 0,5) g of oven-dry pulp. Do not cut pulp sheets and avoid the use of cut edges. If the sample is in the form of machine-dried sheets or flash-dried slabs, soak the pulp thoroughly in 0.5 litre of standard water (4.4) at room temperature for at least 4 h. Tear the soaked pulp into pieces approximately 25 mm x 25 mm in size. It is essential that the pulp sample be thoroughly softened by soaking. to ensure that the preliminary disintegration leads to only a minimal beating effect. Wet pulps may be disintegrated without soaking.
7 Procedure
For each test portion (each degree of beating), carry Out the procedure described in 7.1 to 7.3.
7.1 Disintegration
Disintegrate the initially wet portion or the soaked test portion as described in ISO 5263-1. Use standard water (4.4) at (20 ± 5) °C to give a total volume of (2 000 ± 25) ml. The mass fraction in the disintegrator (4.2) will then be about 1.5%.
Pulps having an initial mass fraction of dry matter of 20 % or more shall be disintegrated for 30 000 revolutions of the propeller, whereas pulps having an initial mass fraction of dry matter of < 20 % shall be disintegrated for 10 000 revolutions of the propeller.AS/NZS 1301.209 pdf download.

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