The effect of heat ageing on color change and optical properties of bleached Chemi-Mechanical Pulp (CMP) with One and Two-stage of Sodium Hypochlorite and Hydrogen Peroxide

High yield and chemi-Mechanical pulps are susceptible to oxidation-optical and thermal reactions. These reactions result discoloration and brightness reversion in pulps. In this research, chemi-mechanical pulps were selected randomly from Mazandaran pulp and paper mill and were bleached separately b...

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Autores principales:	ghasem asadpour, fatemeh rajabi, seyed majid zabizadeh
Formato:	article
Lenguaje:	FA
Publicado:	Regional Information Center for Science and Technology (RICeST) 2019
Materias:	chemi-mechanical pulp thermal aging PC number Optical properties Sodium Hypochlorite hydrogen peroxide Forestry SD1-669.5
Acceso en línea:	https://doaj.org/article/88c34c0b5f4d40af93be9f239552a0ea
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spelling	oai:doaj.org-article:88c34c0b5f4d40af93be9f239552a0ea2021-12-02T11:30:24ZThe effect of heat ageing on color change and optical properties of bleached Chemi-Mechanical Pulp (CMP) with One and Two-stage of Sodium Hypochlorite and Hydrogen Peroxide1735-09132383-112X10.22092/ijwpr.2018.121555.1471https://doaj.org/article/88c34c0b5f4d40af93be9f239552a0ea2019-01-01T00:00:00Zhttp://ijwpr.areeo.ac.ir/article_116886_746b53be1d36c81f9b2d5f781d005c6c.pdfhttps://doaj.org/toc/1735-0913https://doaj.org/toc/2383-112XHigh yield and chemi-Mechanical pulps are susceptible to oxidation-optical and thermal reactions. These reactions result discoloration and brightness reversion in pulps. In this research, chemi-mechanical pulps were selected randomly from Mazandaran pulp and paper mill and were bleached separately by P, H, PH and HP sequences and sheets with 60 gr/m2 gramage were prepared from these bleached pulps. All the prepared papers went through thermal aging, separately at 0, 12, 24, 36 and 48 hours at 1050C in oven, and their optical properties, including, their brightness, their a, b and L factor, α exponent, yellowness, opacity, K/S ratio, and PC number before and after thermal aging were measured and compared based on TAPPI standard. The results of this study showed that, during thermal aging from 0 to 48 h, paper optical properties such as brightness, L and a factor were decreased and b factor, yellowness, α, K/S ration and PC number were increased. As a result, bleaching by P and HP sequences had the highest amount of brightness and L factor and lowest amount of a and b factor, α exponent, yellowness, K/S ratio and PC number. Therefore, these bleaching sequences had important influences on brightness stability and decrease in paper brightness reversion and increasing their durability against thermal degradation.ghasem asadpourfatemeh rajabiseyed majid zabizadehRegional Information Center for Science and Technology (RICeST)articlechemi-mechanical pulpthermal agingPC numberOptical propertiesSodium Hypochloritehydrogen peroxideForestrySD1-669.5FAتحقیقات علوم چوب و کاغذ ایران, Vol 33, Iss 4, Pp 467-477 (2019)
institution	DOAJ
collection	DOAJ
language	FA
topic	chemi-mechanical pulp thermal aging PC number Optical properties Sodium Hypochlorite hydrogen peroxide Forestry SD1-669.5
spellingShingle	chemi-mechanical pulp thermal aging PC number Optical properties Sodium Hypochlorite hydrogen peroxide Forestry SD1-669.5 ghasem asadpour fatemeh rajabi seyed majid zabizadeh The effect of heat ageing on color change and optical properties of bleached Chemi-Mechanical Pulp (CMP) with One and Two-stage of Sodium Hypochlorite and Hydrogen Peroxide
description	High yield and chemi-Mechanical pulps are susceptible to oxidation-optical and thermal reactions. These reactions result discoloration and brightness reversion in pulps. In this research, chemi-mechanical pulps were selected randomly from Mazandaran pulp and paper mill and were bleached separately by P, H, PH and HP sequences and sheets with 60 gr/m2 gramage were prepared from these bleached pulps. All the prepared papers went through thermal aging, separately at 0, 12, 24, 36 and 48 hours at 1050C in oven, and their optical properties, including, their brightness, their a, b and L factor, α exponent, yellowness, opacity, K/S ratio, and PC number before and after thermal aging were measured and compared based on TAPPI standard. The results of this study showed that, during thermal aging from 0 to 48 h, paper optical properties such as brightness, L and a factor were decreased and b factor, yellowness, α, K/S ration and PC number were increased. As a result, bleaching by P and HP sequences had the highest amount of brightness and L factor and lowest amount of a and b factor, α exponent, yellowness, K/S ratio and PC number. Therefore, these bleaching sequences had important influences on brightness stability and decrease in paper brightness reversion and increasing their durability against thermal degradation.
format	article
author	ghasem asadpour fatemeh rajabi seyed majid zabizadeh
author_facet	ghasem asadpour fatemeh rajabi seyed majid zabizadeh
author_sort	ghasem asadpour
title	The effect of heat ageing on color change and optical properties of bleached Chemi-Mechanical Pulp (CMP) with One and Two-stage of Sodium Hypochlorite and Hydrogen Peroxide
title_short	The effect of heat ageing on color change and optical properties of bleached Chemi-Mechanical Pulp (CMP) with One and Two-stage of Sodium Hypochlorite and Hydrogen Peroxide
title_full	The effect of heat ageing on color change and optical properties of bleached Chemi-Mechanical Pulp (CMP) with One and Two-stage of Sodium Hypochlorite and Hydrogen Peroxide
title_fullStr	The effect of heat ageing on color change and optical properties of bleached Chemi-Mechanical Pulp (CMP) with One and Two-stage of Sodium Hypochlorite and Hydrogen Peroxide
title_full_unstemmed	The effect of heat ageing on color change and optical properties of bleached Chemi-Mechanical Pulp (CMP) with One and Two-stage of Sodium Hypochlorite and Hydrogen Peroxide
title_sort	effect of heat ageing on color change and optical properties of bleached chemi-mechanical pulp (cmp) with one and two-stage of sodium hypochlorite and hydrogen peroxide
publisher	Regional Information Center for Science and Technology (RICeST)
publishDate	2019
url	https://doaj.org/article/88c34c0b5f4d40af93be9f239552a0ea
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The effect of heat ageing on color change and optical properties of bleached Chemi-Mechanical Pulp (CMP) with One and Two-stage of Sodium Hypochlorite and Hydrogen Peroxide

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