ISO 21896:2020 pdf download

ISO 21896:2020 pdf download.Paper, pulp, and recycling — Decolouration test of dye coloured paper products and paper products printed using dye inks
1 Scope
This document defines a method for measuring the decolouration capability of commercial products,produced using paper and board dyed in mass and/or printed with dye inks.
This document does not apply to paper printed with pigment inks.
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 186, Paper and board — Sampling to determine average quality
ISO 638, Paper, board and pulps — Determination of dry matter content — Oven-drying method
ISO 2469, Paper, board and pulps — Measurement of diffuse radiance factor (diffuse reflectance factor)
ISO 5269-2, Pulps — Preparation of laboratory sheets for physical testing — Part 2: Rapid-Köthen method
ISO 5635, Paper — Measurement of dimensional change after immersion in water
ISO 5637, Paper and board — Determination of water absorption after immersion in water
ISO 8787, Paper and board — Determination of capillary rise — Klemm method
ISO/TR 10688, Paper, board and pulps — Basic terms and equations for optical properties
ISO 11475, Paper and board — Determination of CIE whiteness, D65/10 degrees (outdoor daylight)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
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 http:// www .electropedia .org/
6.4 Preparation of pads
— Büchner-type filtration equipment with a 150-mm diameter and filtration flask;
— 1-litre beakers;
— Heater plate (95 ± 2) °C or drying section of a Rapid-Köthen handsheet former as specified in ISO 5269-2;
— Pre-weighed, to an accuracy of 0,1 g, 150-mm diameter filter paper. The filter shall be capable of retaining particles with a circle equivalent diameter greater than or equal to 25 µm.
NOTE Whatman 589/1 2) or equivalent filter papers are suitable.
— Blotting paper: manufactured from 100 % bleached chemical pulp, neutral pH, and containing no bonding agent, chemical additive, impurity or fluorescent contamination. It shall be at least 3 mm larger than the filter paper in each direction. The grammage shall be (250 ± 25) g/m 2 ; the water absorption capacity, determined according to ISO 8787, shall be (70 ± 20) mm and the change in dimensions after immersion, measured according to ISO 5635, shall not exceed 3 % in each direction. The grammage after immersion, determined following the procedure described in ISO 5637, shall be (450 ± 50) g/m 2 ;