EFFECT OF DEPITHING ON BAGASSE PULP AND PAPER PROPERTIES

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RASOOLY GARMAROODY E.; RASHIDAVI J.; RAMEZANI O.; SARAEEAN A.R.

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Journal: Journal of Wood and Forest Science and Technology Year:2016 | Volume:22 | Issue:4 Page(s): 167-186

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Title

EFFECT OF DEPITHING ON BAGASSE PULP AND PAPER PROPERTIES

Author(s)

RASOOLY GARMAROODY E. | RASHIDAVI J. | RAMEZANI O. | SARAEEAN A.R. | Issue Writer Certificate

Keywords

BAGASSEQ2

PITHQ2

DEPITHINGQ2

ACTIVE ALKALIQ2

STRENGTH PROPERTIESQ1

Abstract

Background and objectives: Previous studies show that 30 to 35 percent by weight of BAGASSE is PITH that mostly formed from soft and thin-walled parenchymal cells with irregular shapes by large amounts of ash with high absorption capacity. Although PITH chemical structure is similar to fiber, but in terms of morphological and physical characteristics are very different and it cannot convert to qualified pulp due to small dimensions, the non-fibrous physical nature and aggregation (link) with the dust. Due to these inherent disadvantages and associated problems, PITH should be removed in effective manner. Otherwise, to produce pulp with the similar kappa number, chemicals used more. Also, when the DEPITHING increases (ie, the ratio of fiber to PITH enhances), initial freeness of pulp and STRENGTH PROPERTIES of its paper also increased. In different reasons, PITH can have adverse effects on the properties of pulping and its paper. In this respect, Pars Paper Mill is facing with high use of chemicals in the pulping that one of the reasons could be the lack of efficiency of depithers and subsequently presence of PITH in the pulping which absorbed a lot of chemicals and so, despite higher consumption of chemicals, produced pulp quality is not high. In addition to increasing pollution loading in effluent, also will bring a lot of environmental problems. The effect of DEPITHING levels on BAGASSE soda pulping and its pulp and paper properties were studied in Pars paper factory.Materials and methods: BAGASSE with different levels of DEPITHING (i.e. BAGASSE with 30, 20, 10, 5 and 0% of PITH) were cooked under the same pulping condition as used in pars factory: chemical charge 15% of sodium hydroxide (NaOH applied based on dry fiber), temperature: 170°C, cooking time: 15 minutes and L:W= 10:1. Effects of different level of PITH on residual ACTIVE ALKALI, pulp properties such as freeness, shive, kappa number and drainage time and paper properties such as tear, burst, tensile, density, brightness and opacity were investigated.Results: Results have shown that by PITH level decreasing in raw material, the residual ACTIVE ALKALI in black liquor increased and pulp properties such as kappa number, screen yield, shive content, initial freeness and drainage time improved. Also, STRENGTH PROPERTIES of paper such as tear, burst and tensile increased.Conclusion: In addition, comparing these results to pulping conditions of above factory indicated that the efficiency of factory DEPITHING process is very low. Therefore, its effect appears in high level of PITH and consequently high chemical consumption in digester and hence contributes to the inferior quality of pulp and paper properties.

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APA: Copy

RASOOLY GARMAROODY, E., RASHIDAVI, J., RAMEZANI, O., & SARAEEAN, A.R.. (2016). EFFECT OF DEPITHING ON BAGASSE PULP AND PAPER PROPERTIES. JOURNAL OF WOOD AND FOREST SCIENCE AND TECHNOLOGY, 22(4), 167-186. SID. https://sid.ir/paper/156922/en

Vancouver: Copy

RASOOLY GARMAROODY E., RASHIDAVI J., RAMEZANI O., SARAEEAN A.R.. EFFECT OF DEPITHING ON BAGASSE PULP AND PAPER PROPERTIES. JOURNAL OF WOOD AND FOREST SCIENCE AND TECHNOLOGY[Internet]. 2016;22(4):167-186. Available from: https://sid.ir/paper/156922/en

IEEE: Copy

E. RASOOLY GARMAROODY, J. RASHIDAVI, O. RAMEZANI, and A.R. SARAEEAN, “EFFECT OF DEPITHING ON BAGASSE PULP AND PAPER PROPERTIES,” JOURNAL OF WOOD AND FOREST SCIENCE AND TECHNOLOGY, vol. 22, no. 4, pp. 167–186, 2016, [Online]. Available: https://sid.ir/paper/156922/en

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