Chemi-mechanical pulp from rapeseed straw

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F16%3A39901674" target="_blank" >RIV/00216275:25310/16:39901674 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Chemi-mechanical pulp from rapeseed straw

Popis výsledku v původním jazyce

This study deals with chemi-mechanical pulping of rapeseed straw (species Brassica napus L. convar. napus). Three cold chemi-mechanical processes, namely neutral sulphite, alkaline sulphite, and caustic soda, were applied under laboratory conditions. The chemi-mechanical pulping comprises four main operations, viz. chipping, grinding, leaching, and beating. The influence of varying charges of chemicals on the total yield, strength properties such as bending stiffness, bending modulus of elasticity, curvature in the region of elastic and plastic deformation, as well as the tensile index of pulp hand sheets was determined. The results obtained revealed that the cold caustic soda pulping has greater effect on the bending stiffness and bending modulus of chemi-mechanical pulps in comparison with neutral sulphite and alkaline sulphite pulping, although the total pulp yield for caustic soda pulping was lower than that for neutral sulphite and alkaline sulphite pulping. For all three cold processes, the bending stiffness, as well as the bending modulus of elasticity in the region of elastic deformation increased with increasing the chemical charge. However, the tensile index of chemi-mechanical pulps was found to be significantly lower in comparison with kraft softwood pulp and pulp from waste paper. The chemi-mechanical pulp was characterized by its degree of polymerization which was measured in the range of 75 to 110 with respect to relatively great amount of low molecular substances presented in pulps prepared by the cold pulping process.

Název v anglickém jazyce

Chemi-mechanical pulp from rapeseed straw

Popis výsledku anglicky

This study deals with chemi-mechanical pulping of rapeseed straw (species Brassica napus L. convar. napus). Three cold chemi-mechanical processes, namely neutral sulphite, alkaline sulphite, and caustic soda, were applied under laboratory conditions. The chemi-mechanical pulping comprises four main operations, viz. chipping, grinding, leaching, and beating. The influence of varying charges of chemicals on the total yield, strength properties such as bending stiffness, bending modulus of elasticity, curvature in the region of elastic and plastic deformation, as well as the tensile index of pulp hand sheets was determined. The results obtained revealed that the cold caustic soda pulping has greater effect on the bending stiffness and bending modulus of chemi-mechanical pulps in comparison with neutral sulphite and alkaline sulphite pulping, although the total pulp yield for caustic soda pulping was lower than that for neutral sulphite and alkaline sulphite pulping. For all three cold processes, the bending stiffness, as well as the bending modulus of elasticity in the region of elastic deformation increased with increasing the chemical charge. However, the tensile index of chemi-mechanical pulps was found to be significantly lower in comparison with kraft softwood pulp and pulp from waste paper. The chemi-mechanical pulp was characterized by its degree of polymerization which was measured in the range of 75 to 110 with respect to relatively great amount of low molecular substances presented in pulps prepared by the cold pulping process.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

JJ - Ostatní materiály

OECD FORD obor

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Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Cellulose Chemistry and Technology

ISSN

0576-9787

e-ISSN

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Svazek periodika

50

Číslo periodika v rámci svazku

3-4

Stát vydavatele periodika

RO - Rumunsko

Počet stran výsledku

8

Strana od-do

489-496

Kód UT WoS článku

000381325100021

EID výsledku v databázi Scopus

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