Pappersteknik

Ämnesområden: Massa
Kommittébeteckning: SIS/TK 157 (Massa och papper)
Källa: ISO
Svarsdatum: den 6 jul 2022
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This standard describes a procedure for determining the content of residual alkali in Kraft black liquors having a dry matter content up to 40 %.
NOTE If the dry matter content of the sample exceeds 40 %, the sample needs to be diluted with distilled water to a dry matter content around 20 %.
The method is based on a potentiometric titration with hydrochloric acid and is intended for black liquor samples with an initial pH ≥11,0.
The lower limit of determination is 0,1 g/l of eq. NaOH.

Ämnesområden: Massa
Kommittébeteckning: SIS/TK 157 (Massa och papper)
Källa: ISO
Svarsdatum: den 6 jul 2022
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This standard specifies a potentiometric titration procedure for the determination of total, active and effective alkali in white and green liquors obtained and used in the kraft or sulphate pulping process. This method may not be used for the analysis of liquors such as oxidized white liquors which contain significant amounts of polysulphides. The definitions given below do not apply to such liquors. This method is not intended for the determination of particular ionic species, such as sulphides or carbo- nates.

Ämnesområden: Massa
Kommittébeteckning: SIS/TK 157 (Massa och papper)
Källa: ISO
Svarsdatum: den 6 jul 2022
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This Standard describes a procedure for the determination of sulphide, i.e. the hydrosulphide ion concentration, in white, oxidized white and green liquors as well as in black liquor having a dry matter content up to 40 %. The determination also includes the sulphide part of any polysulphide present in the solution.
NOTE 1 If the dry matter content of the sample exceeds 40 %, the sample needs to be diluted with oxygen-free water (5.1) to a dry matter content around 20 %. The procedure can result in low results due to unintentional oxidation during the dilution.
NOTE 2 The Standard has not yet been tested for oxidized black liquors.

Kommittébeteckning: SIS/TK 157 (Massa och papper)
Källa: ISO
Svarsdatum: den 10 aug 2022
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This document specifies a method for determining the bacteria, yeast and mould population on the surface of paper and paperboard. The enumeration relates to specific media. The standard is applicable to all kinds of paper and paperboard, to dry market pulp in sheet form and to packaging material. The first part of ISO 8784 deals with the enumeration of aerobic bacteria and bacterial spores in dry market pulp, paper and paperboard, and it is based on disintegration.
NOTE The appropriateness of this standard may be specified by regulations.