A comparative study of the effect of refining on charge of various pulps

Banavath, Hussen Naik; Bhardwaj, Nishi Kant; Ray, A. K.

doi:10.1016/j.biortech.2010.12.109

Cited by 68 publications

(39 citation statements)

References 15 publications

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“…1, increased as the beating revolutions were increased. Similar results were shown by previous researchers working with oil palm EFB (Jiménez et al 2009), various wood and non-wood pulps (Banavath et al 2011), and semantan bamboo (Nurul Husna et al 2013). The burst strength of the coir paper increased tremendously after the beating process at 1000 revolutions.…”

Section: Fig 1 Freeness and Burst Index At Different Beating Revolusupporting

confidence: 89%

Linerboard Made from Soda-Anthraquinone (Soda-AQ) Treated Coconut Coir Fiber and Effect of Pulp Beating

Main¹,

Talib²,

Ibrahim³

et al. 2015

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The performance of coir fiber in the production of linerboard made from soda-anthraquinone (soda-AQ) pulp was evaluated. Based on chemical analysis, the composition of coir fiber is suitable for the pulping process. Out of nine pulping conditions characterized, a pulping condition of 18% active alkali for 90 min cooking time was chosen. These conditions provided the highest screened yield (48.99%), a low rejection yield (0.27%), high viscosity (11.73 cP), and a kappa number (41) that is acceptable for unbleached linerboard production. Beating strengthened the coir pulp. Analyzing the beating revealed that coir pulp was optimized at 1000 to 2000 revolutions, based on a graph of freeness vs. burst index. For all beating conditions (1000 to 8000 revolutions), FESEM micrographs showed the presence of internal and external fibrillation of the fiber, which gradually increased fiber conformability and improved the inter-fiber bonding within the paper formation. Based on its burst strength of 4.57 kPa.m 2 /g and ring crush test of 1.76 Nm 2 /g, which complies with the minimum requirement of the industry standard, coir fiber can be considered an alternative fiber source for linerboard production.

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Section: Fig 1 Freeness and Burst Index At Different Beating Revolusupporting

confidence: 89%

Linerboard Made from Soda-Anthraquinone (Soda-AQ) Treated Coconut Coir Fiber and Effect of Pulp Beating

Main¹,

Talib²,

Ibrahim³

et al. 2015

BioResources

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“…Cellulosic fibers carry a negative charge when suspended in water due to the presence of ionisable acidic groups in the hemicellulose and lignin (Banavath et al 2011). Figure 1 shows fiber surface composition in both unbleached and bleached fibers.…”

Section: Surface Composition and Acetone Extractivesmentioning

confidence: 99%

“…Figure 3 shows that there were basically no statistically significant differences in the fiber total charge independent of the cooking method or wood species used in the unbleached and bleached pulps. Banavath et al (2011) concluded that the total charge depended mainly on the chemical composition of the fiber but not on the physical change in the fiber. The higher proportion of carbohydrate in unbleached fibers of E. globulus might explain the tendency of a higher total charge than in E. nitens, even though they are not statistically different.…”

Section: Fiber Total Charge and Superficial Chargementioning

confidence: 99%

Fiber Surface and Paper Technical Properties of Eucalyptus globulus and Eucalyptus nitens Pulps after Modified Cooking and Bleaching

Antes¹,

Joutsimo²

2015

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The SuperBatch™(SB), CompactCooking™(CC), and Lo-Solids™ (LS) modified cooking methods were evaluated relative to the cell wall surface and paper technical properties of bleached Eucalyptus globulus and Eucalyptus nitens. E. globulus pulps presented higher screened yield and brightness than E. nitens, which needed higher H-factor to reach a kappa number target. Independently of the cooking method or species, all the samples consumed similar amounts of ClO2 to reach a brightness of 90% ISO. E. nitens pulps showed lower carbohydrates and higher extractives content on the fiber surface, regardless of the cooking method. E. nitens presented slightly higher surface charge of the bleached pulps. Surface charges of CC and LS pulps were higher independently of cooked Eucalyptus species. Water retention value (WRV) for E. nitens pulps were higher than for E. globulus. No differences were observed in refinability of different cooking methods, however E. nitens pulps showed higher tensile and lower bulk compared to E. globulus. E nitens presented a thinner fiber cell wall than E. globulus. This seems to be more relevant for paper technical properties and WRV than fiber charge or surface composition. No correlation between surface composition, fiber surface properties, and paper technical properties among the cooking methods could be determined.

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“…O refino da celulose é um procedimento que visa a elevar a resistência física do papel, devido à maior conformação e uniformidade das fibras (BANAVATH et al, 2011;TAIPALE et al, 2010), no entanto, reduz as propriedades ópticas (LUNDIN et al, 2009). Ao atingirem um ponto máximo de refino, as propriedades da folha tendem a se estabilizar e, se o refino for prolongado, ele pode levar ao declínio (GIGAC;FIŠEROVÁ, 2008;LUNDIN et al, 2009).…”

Section: Introductionunclassified

Efeito de reagentes de branqueamento na classificação e refinação de polpa de eucalipto

Favaro

Ventorim

Caraschi

2014

CERNE

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RESUMO:Objetivou-se, neste estudo, avaliar o comportamento do branqueamento de polpa de celulose kraft de eucalipto nas propriedades físicas e mecânicas do papel. A polpa foi branqueada por quatro sequências semelhantes, sendo elas: D(E+P)DD (referência), A HT D(E+P)DD, D(E+P)D(PO), P X (E+P)DD. Cada uma das sequências contendo um dos reagentes analisados: dióxido de cloro, ácido sulfúrico peróxido de hidrogênio pressurizado, e perácido (ácido de Caro). Parte das amostras foi refinada para 40ºSR, enquanto a outra parte foi classificada em equipamento Bauer-McNett. Posteriormente, a porção retida na malha de 50 mesh, foi refinada ao mesmo número de revoluções que sua amostra global. As polpas branqueadas com A HT , P X e PO apresentaram diminuição da resistência mecânica e aumentaram a concentração de polpa em peneiras mais finas, durante a classificação, pois esses reagentes são pouco seletivos. Os resultados encontrados mostraram que polpas branqueadas por reagentes como o perácido e peróxido de hidrogênio pressurizado indicaram menores resistências, assim como suas frações de polpa. No entanto, apesar da baixa seletividade da hidrólise ácida, foi verificado que essa sequência apresentou altos índices de rasgo e tração, tanto da polpa global quanto da polpa classificada, concluindo que as polpas apesar de classificadas, apresentam elevada resistência mecânica. EFFECT OF BLEACHING REAGENTS ON EUCALYPTUS KRAFT PULP FRACTIONATION AND REFINING ABSTRACT:The aim of this study was to evaluate the behavior of eucalyptus kraft pulp bleaching on paper physical and mechanical properties. Pulp was bleached by four similar sequences, each containing one of the reagents analyzed: D(E+P)DD (reference), A HT D(E+P)DD, D(E+P)D(PO), and P X (E+P)DD. Each of the sequences contained one of the studied reagents: chlorine dioxide, sulfuric acid, pressurized hydrogen peroxide, and peracid (Caro's acid). One part of the samples was refined to 40ºSR, whereas the other part was classified in a Bauer-McNett. Subsequently, the part retained in 50 mesh sieve, was refined to the same number of revolutions as the global sample. Pulp bleached in A HT , PO, and P X exhibited reduced mechanical strength and during fractionating increased the concentration of fibers in finer sieves because these reagents are less selective. The results show that pulp bleached in reagents such as pressurized hydrogen peroxide and peracid indicated reduced strength and produced greater fiber concentrations. However, despite the low selectivity of acid hydrolysis, it was found that this sequence had very high tear and tensile strength comparable to classified and global pulp, concluding that regardless of classification, pulp fractions may have high mechanical strength.

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A comparative study of the effect of refining on charge of various pulps

Cited by 68 publications

References 15 publications

Linerboard Made from Soda-Anthraquinone (Soda-AQ) Treated Coconut Coir Fiber and Effect of Pulp Beating

Linerboard Made from Soda-Anthraquinone (Soda-AQ) Treated Coconut Coir Fiber and Effect of Pulp Beating

Fiber Surface and Paper Technical Properties of Eucalyptus globulus and Eucalyptus nitens Pulps after Modified Cooking and Bleaching

Efeito de reagentes de branqueamento na classificação e refinação de polpa de eucalipto

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