ISO 21896:2020 PDF

Name: ISO 21896:2020 — Paper, pulp, and recycling — Decolouration test of dye coloured paper products and paper products printed using dye inks
SKU: ISO 21896:2020
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Paper, pulp, and recycling — Decolouration test of dye coloured paper products and paper products printed using dye inks

Название (английский):

ISO 21896:2020

Paper, pulp, and recycling — Decolouration test of dye coloured paper products and paper products printed using dye inks

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 14
Дата публикации:: 23 марта 2020 г.
Издание:: ISO IS 21896 edition 1 version 1
ICS:: 85.080.01

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Описание (английский):

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.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 21896:2020 - Paper, pulp, and recycling - Decolouration test of dye coloured paper products and paper products printed using dye inks specifies a laboratory method to measure the decolouration capability of dye‑coloured papers and paper products printed with dye inks. The standard defines how to reslush (re‑pulp) samples, apply reductive and oxidative bleaching treatments, form filter pads and perform optical measurements to calculate a decolouration index (DRI). Note: this standard does not apply to papers printed with pigment inks.

Key topics and technical requirements

Scope & principle

Laboratory method to assess chemical decolouration (not mechanical deinking) of dye‑containing papers during recycling and bleaching.
Produces a DRI value indicating bleaching effectiveness.

Apparatus & conditions

Pulp preparation mixer (e.g., 5 L Hobart‑type pulper).
Reductive bleaching with sodium hydrosulphite (controlled pH, 50 ± 2 °C water bath, sealed jars).
Oxidative bleaching with hydrogen peroxide (70 ± 2 °C water bath, pH control, sealed/plastic bag).
Pad preparation: Büchner filtration, 150 mm filter papers (retaining ≥25 µm particles), Rapid‑Köthen drying or 95 ± 2 °C heating.
Optical instrumentation to measure tristimulus/CIELAB values and diffuse reflectance.

Procedure highlights

Sampling per ISO 186 and pulp dry matter determination (ISO 638).
Re‑slushing and controlled bleaching (both reductive and oxidative options).
Preparation, conditioning and optical measurement of filter pads.
Calculation of DRI (%) from measured optical changes.

Safety & quality

Use of hazardous reagents and temperature control - observe appropriate laboratory safety and handling.

Applications and users

ISO 21896:2020 is practical for:

Paper and board recyclers assessing how dye‑coloured or dye‑printed feedstocks respond to bleaching.

Quality control and R&D laboratories evaluating the effectiveness of bleaching chemistries on dyed papers.

Ink and paper manufacturers characterizing dye fugacity and recyclability of products printed with dye inks.

Environmental and process engineers optimizing recycling lines where bleaching supplements deinking.

Keywords: ISO 21896:2020, decolouration test, dye coloured paper, dye inks, paper recycling, decolouration index, sodium hydrosulphite, hydrogen peroxide, filter pads, optical measurements.

Related standards

Relevant normative references include:

ISO 186 (sampling),

ISO 638 (dry matter content),

ISO 2469 (diffuse reflectance),

ISO 5269‑2 (handsheet drying - Rapid‑Köthen),

ISO 11475 (CIE whiteness),

and ISO/TR 10688 (optical property terms).

Use ISO 21896:2020 to quantify bleaching potential of dye‑based paper products and to support recycling process decisions where chemical decolouration supplements deinking.

ISO 21896:2020 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards

Технические детали

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SIST EN ISO 5269-2:2005

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BS ISO 11475:2017

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PD ISO/TR 10688:2015

Paper, board and pulps. Basic terms and equations for optical properties