Kraft Cooking and Bleaching Ability of Lowdensity Acacia Wood and Hardwoods with Varying Chemical Characteristics of Lignin

Tanifuji, Keishi; Nozaki, Ken; Sugiura, Taro; Ohi, Hiroshi

doi:10.2524/jtappij.72.944

Cited by 3 publications

(1 citation statement)

References 11 publications

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“…This result is very low, as compared with the wood density of acacias. 20 Tanifuji et al 21 showed that the wood density of the Acacia hybrid is lower than that of other acacias. Low wood density results in lower pulp yield.…”

Section: Resultsmentioning

confidence: 99%

Pulping of Hybrid Acacia Planted in a Social Forestry Program in Bangladesh

Haque¹,

Aziz²,

Hossain³

et al. 2019

Cellulose Chem. Technol.

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Acacias have been planted and it was found that Acacia auriculiformis, Acacia mangium and their hybrid are promising species with respect to their survival and growth performance in Bangladesh. Therefore, these three species have been introduced into a social forestry program in Bangladesh. In this study, the chemical, physical and morphological characteristics of wood originating from plantation A. auriculiformis, A. mangium and their hybrid, grown in Bangladesh, were assessed for their suitability in papermaking. The α-cellulose content of the Acacia hybrid was 45.5%, which was 1.3% lower than that of A. mangium and 2.1% higher than that of A. auriculiformis. Kraft pulping of Acacia hybrid was carried out, with varying active alkali charge and cooking time, and it was observed that the hybrid required a high chemical charge to cook properly. Under the cooking conditions of 18% active alkali charge, 120 min of cooking, a pulp yield of 45.9% was reached, with kappa number 27.6 and with no reject. The pulp yield was quite high, as compared to those of A. auriculiformis and A. mangium. Acacia hybrid and Acacia auriculiformis pulps showed almost similar papermaking properties. The maximum tear index of Acacia hybrid was achieved at a tensile index of 76.3 N.m/g, while it was 61.9 N.m/g for A. auriculiformis and 57.2 N.m/g for A. mangium. At these peak levels, the tear index values are almost similar (10 mN.m 2 /g) for A. auriculiformis and the hybrid. With respect to pulp yield and papermaking properties, the hybrid produced the best pulpwood.

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Section: Resultsmentioning

confidence: 99%

Pulping of Hybrid Acacia Planted in a Social Forestry Program in Bangladesh

Haque¹,

Aziz²,

Hossain³

et al. 2019

Cellulose Chem. Technol.

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Physical and Mechanical Properties of Papers Produced From Different Cellulosic Pulps Blending

Pego

Bianchi

Yasumura

2022

Preprint

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This study aimed to evaluate the effect of different fiber blending in the physical-mechanical properties of papers and understand to what extent the fiber blending influence produced paper quality. Three different commercial cellulosic pulps were used: eucalyptus, sisal, and pine pulp. Fiber morphological analyses were performed after refining in each pulp. The pulps were blended two by two in 5/95%, 25/75%, and 45/55% ratio in all possible combinations. Handsheets were formed (2% consistency) in a lab papermaking machine and tested by physical and mechanical properties. Virgin pulps (without blending) were also used for handsheet production. Fibers presented different features regarded to morphological properties and indexes. Most significant differences were related to fiber length. Statistical differences occurred in all physical and mechanical properties. Differences were due to morphological features. The highest and lowest values were pointed out for each property. Thickness tended to decrease with fiber blending in all proportion. Thickness and grammage were not related. For all mechanical properties, the lowest values were obtained in eucalyptus treatment and blending involving it. The highest values were obtained in pine, sisal, and blending treatments. A small addition of sisal (5%) in eucalyptus pulp improved the tensile strength, tensile index, stretch, bursting index, tear index, and fold endurance in approximately 41.5, 54.8, 51.4, 28.9, 37.5, and 33.3%, respectively. The same addition using pine resulted in an improvement of 15.9, 22.7, 22.7, 37.4, 46.7, and 133.3%. Fiber blending presented a synergetic effect for physical and mechanical properties.

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Chlorine-free Bleaching of Eucalyptus Kraft Pulp Using a Mixture of Peroxymonosulfuric Acid and a Trace of Chlorine Dioxide

Huang

Salaghi

et al. 2021

Mokuzai Gakkaishi

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This study proposed eco-friendly chlorine-free bleaching as a method of pulp production for papermaking. As a wood species with excellent cooking ability, 12-year-old Eucalyptus globulus wood chips were kraft-cooked and oxygen (O) −bleached in a laboratory, and then the bleaching response was evaluated. In addition, these were compared with an O-bleached kraft mill pulp (LOKP) , which was produced in a mill from mixed wood chips of E. globulus and Acacia spp. A five-stage bleaching sequence (O−P sa −E p −P sa −E p ) using O-bleaching, peroxymonosulfuric acid (P sa ) treatment and alkaline hydrogen peroxide (E p ) treatment was adopted. Produced E. globulus kraft pulp (yield : 50.1%, kappa number : 16.0, brightness : 33.3% ISO, viscosity 72.2 mPa•s) provided a bleached pulp with brightness of 88.6% ISO and viscosity of 10.8 mPa•s. Using a modified bleaching process by adding a small amount of ClO 2 to the P sa stages in a sequence of O− (P sa +ClO 2 )−E p − (P sa +ClO 2 ) −E p , viscosity of the bleached pulp was increased to 12.3 mPa•s with no significant change in brightness. The LOKP resulted in brightness of 90.1% ISO and viscosity of 8.

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Kraft Cooking and Bleaching Ability of Lowdensity Acacia Wood and Hardwoods with Varying Chemical Characteristics of Lignin

Cited by 3 publications

References 11 publications

Pulping of Hybrid Acacia Planted in a Social Forestry Program in Bangladesh

Pulping of Hybrid Acacia Planted in a Social Forestry Program in Bangladesh

Physical and Mechanical Properties of Papers Produced From Different Cellulosic Pulps Blending

Chlorine-free Bleaching of Eucalyptus Kraft Pulp Using a Mixture of Peroxymonosulfuric Acid and a Trace of Chlorine Dioxide

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