BS ISO 21993:2020 pdf free.Paper and pulp一Deinkability test for printed paper products.
BS ISO 21993 This document specifies a basic laboratory test method for deinkability, applicable to any kind of printed paper product, under alkaline conditions by means of single stage flotation deinking and fatty acid-based collector chemistry.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 187, Paper, board and pulps一Standard atmosphere for conditioning and testing and procedure for monitoring the atmosphere and conditioning of samples ISO 638, Paper, board and pulps一Determination of “dry matter content – – Oven-drying method ISO 1762, Paper, board, pulps and cellulose nanomaterials一Determination of residue (ash content) on ignition at 525 °C
ISO 2469:2014, Paper; board and pulps一Measurement of diffuse radiance factor (diffuse reflectance factor) ISO 2470-1, Paper, board and pulps一Measurement of diffuse blue reflectance factor一Part 1: Indoor daylight conditions (ISO brightness) ISO 3689, Paper and board一Determination of bursting strength after immersion in water ISO 4119:1995, Pulps – Determination of stock concentration.This laboratory scale method defines the essential steps of the flotation deinking process: pulping and flotation. In order to simulate the average age of paper recovered from households, an accelerated ageing step is part of the procedure. Special care was taken to define a procedure without the need to test unprinted paper. The whole laboratory procedure and the required chemicals are shown in Figure 1.The deinkability is assessed by three main quality parameters of the deinked pulp and one important process parameter.Prepare 2 000 g of deinking solution which will be sufficient for several tests. Dissolve 6 g of sodium hydroxide in approximately 600 g of deionised water, heat slowly to approximately 60 °C and proceed by adding 8 g of oleic acid. Stir until the solution is clear, then add 18 g of sodium sillicate and fill up with deionised water to 2 000 g. The formation of soap reduces the alkalinity. 0,114 % of sodium hydroxide is needed to neutralise the oleic acid.In addition, prepare 100 g of hydrogen peroxide solution for each test, using deionised cold water.BS ISO 21993 pdf download.