EFFECTS OF HOT WATER AND ALKALI PRETREATMENT ON YIELD AND OPTICAL AND RESISTANCE PROPERTIES OF HORNBEAM CMP PULP

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ASADPOUR ATTOEII GH.; ALIPOUR M.; ZABIHZADEH S.M.; GHAZVINI Z.

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Journal: Journal of Wood and Forest Science and Technology Year:2016 | Volume:23 | Issue:3 Page(s): 119-220

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Title

EFFECTS OF HOT WATER AND ALKALI PRETREATMENT ON YIELD AND OPTICAL AND RESISTANCE PROPERTIES OF HORNBEAM CMP PULP

Author(s)

ASADPOUR ATTOEII GH. | ALIPOUR M. | ZABIHZADEH S.M. | GHAZVINI Z. | Issue Writer Certificate

Keywords

ALKALINE PRE-TREATMENTQ1

HORNBEAMQ2

BRIGHTNESSQ2

EXTRACTIVESQ2

CMP PULPQ1

Abstract

Background and objectives: Some extractive compounds from wood, adhesives which are difficult to remove during pulp washing and cause adhesive residues on process equipment. In preparing pulp from hardwoods, these compounds are the source of numerous problems such as the formation of sticky materials, impurities remain in the paper pulp and paper break in paper machine. In addition, remain these compounds on paper caused problems such as creation dark spots and paper fibers stick on the cylinder surface, paper breaks and clogging with and felt. Also the EXTRACTIVES may react with chemical bleaching and produce changed and oxidized products. Changed EXTRACTIVES are causing pitch problem and have a negative impact on pulp BRIGHTNESS. In this study, the effect of hot water and alkali pretreatment on the bleach ability of HORNBEAM CMP PULP was studied.Methods and materials: HORNBEAM wood chips prepared from Mazandaran wood and paper mill. In three levels of 0.5, 2 and 3.5 percent pretreated with hot water and alkali were done for aim of removing the EXTRACTIVES before pulping and then paper pulp prepared from control and pretreated wood chips with the same conditions and CMP process and bleached with hydrogen peroxide. Handmade paper produced from the resulting pulp and papers optical properties before and after bleaching and strength properties of produced papers before bleaching was examined.Results: The sample pre-treated with stable temperature and time, the mass loss during pretreated with hot water is less than pre-treated with alkali and in the alkali treatment, the mass loss increased with increasing alkali percent. In both pretreated cases, pretreated HORNBEAM chips pulp yield is more than the control sample. The refining rounds and energy consumption of paper pulp produced from alkali pretreated chips is more than pulp from wood chips pre-treated with hot water. The BRIGHTNESS of hot water and alkali pre-treated samples before and after bleaching increased to compare to the control sample. During alkali pre-treated, with increasing the percentage of alkaline, pre-treated samples also showed increase BRIGHTNESS. Before bleaching, opacity of pretreated sample with hot water had low increase and in general, no significant differences between the samples treated with hot water and control at the level of 5% was observed. The sample pretreated with stable temperature and time, the HORNBEAM tensile index increased. Pretreatment with alkali also showed that the increases in the tensile index. Burst index was increased by hot water and alkali pretreatments. Treatment of Samples with hot water and alkali also showed that and an increase in the tear index which was directly related to the percentage alkali.Conclusion: Pretreatment of HORNBEAM wood chips with hot water and alkali caused to reduce wood chips mass and increase CMP wood pulp yield has been compared to the control samples. BRIGHTNESS of pretreatment samples before and after bleaching increased than the control sample. Opacity in the samples pretreated with hot water increased and decreased during the treatment with alkaline solution. In those pre-treated with hot water and alkaline solution than the control sample, HORNBEAM paper pulp tear index increased but in burst index and tear strength, no difference significant has been observed.

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APA: Copy

ASADPOUR ATTOEII, GH., ALIPOUR, M., ZABIHZADEH, S.M., & GHAZVINI, Z.. (2016). EFFECTS OF HOT WATER AND ALKALI PRETREATMENT ON YIELD AND OPTICAL AND RESISTANCE PROPERTIES OF HORNBEAM CMP PULP. JOURNAL OF WOOD AND FOREST SCIENCE AND TECHNOLOGY, 23(3), 119-220. SID. https://sid.ir/paper/156781/en

Vancouver: Copy

ASADPOUR ATTOEII GH., ALIPOUR M., ZABIHZADEH S.M., GHAZVINI Z.. EFFECTS OF HOT WATER AND ALKALI PRETREATMENT ON YIELD AND OPTICAL AND RESISTANCE PROPERTIES OF HORNBEAM CMP PULP. JOURNAL OF WOOD AND FOREST SCIENCE AND TECHNOLOGY[Internet]. 2016;23(3):119-220. Available from: https://sid.ir/paper/156781/en

IEEE: Copy

GH. ASADPOUR ATTOEII, M. ALIPOUR, S.M. ZABIHZADEH, and Z. GHAZVINI, “EFFECTS OF HOT WATER AND ALKALI PRETREATMENT ON YIELD AND OPTICAL AND RESISTANCE PROPERTIES OF HORNBEAM CMP PULP,” JOURNAL OF WOOD AND FOREST SCIENCE AND TECHNOLOGY, vol. 23, no. 3, pp. 119–220, 2016, [Online]. Available: https://sid.ir/paper/156781/en

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