ISO 21896-2020 pdf free.Paper, pulp, and recycling — Decolouration test of dye colouredpaper products and paper productsprinted 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 contentconstitutes requirements of this document. For dated references, only the edition cited applies. Forundated 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 methodISO 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-Kothen methodISO 5635, Paper —Measurement of dimensional change after immersion in water.ISO 5637, Paper and board —Determination of water absorption after immersion in waterISo 8787, Paper and board -Determination of capillary rise – Klemm method
ISO/TR 10688,Paper, board and pulps — Basic terms and equations for optical properties
IS0 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.
4.Principle:After re-slushing coloured and/or printed paper according to a specified method, the pulp obtainedis bleached using two processes and pads are made. A decolouration index is determined by opticalmeasurements on the pads obtained by each of the bleaching processes specified in this document.
4.Pulp preparation material:Mixer with a recommended capacity of 5 l able to re-slush paper for recycling at a high stockconcentration (ca.w/v 20 %).
NOTEA Hobart N501) type apparatus is suitable.Hydrogen peroxide H-0, the peroxide concentration shall not exceed 40 g/l (unstable abovethis limit);
DTPA-type chelating agent;NaOH (caustic soda) in tablet form or a solution at a concentration of 20 %;standard sodium silicate;Tap water at room temperature.ISO 21896 pdf download.