The effect of harvesing time on kenaf biomass and quality of carton top liner

Mahdavi, Saeed; Rezvani, Mohammad Hadi

doi:10.22092/ijwpr.2021.343118.1618

Document Type : Research Paper

Authors

¹ Ph.D., Wood and Paper Science Research Division, Research Institute of Forests and Rangelands , Iran,

² Wood Science and Technology Department, Faculty of Materials Engineering and New Technologies, Shahid Rajaee Teacher Training University, Tehran, Iran

https://doi.org/10.22092/ijwpr.2021.343118.1618

Abstract

Kenaf as an industrial plant can play an important role in providing shortage of virgin fiber for paper and board based on the history of cultivation in Iran. Harvesting time of kenaf is one of the most important economic-technical aspect, so the growth rate of kenaf (variety of Cuba) and the weight ratio of bast, core and pith individually were measured at 5, 6 and 7 months after planting and kenaf biomass was determined after 7 month. Soda-AQ pulping from kenaf bast fiber was adjusted at 14% and 16% chemical charges, 175°C, 120 min., liquor to bast fiber of 5:1 and adding 0.2% AQ. Handsheet was made by the bast pulp from the three harvested times with base weight of 110 g/m2. The results showed that by increasing the harvest period from 5 to 6 and 7 months, stalk height and diameter increased 9% and 5%, and vice versa, respectively. The weight ratio of kenaf bast to core has decreased by increasing of harvest time. Dry and green biomass of kenaf was determined at 33.1 and 7.7 t/ha, respectively. Screen yield, kappa number, and reject were of pulp were measured for combinations of optimal cooking in range of 48.8% to 52.9%, 35.4 to 72.6, and 0.92% to 2.5%, respectively. The beating energy consumption of pulp that prepared from 7 month harvesting time was greater than the others. Optimal conditions were determined as harvesting time of 5 month and cooking variables of 120 min, 165 °C and 16% NaOH for carton top liner. Handmade paper properties compared to kraft liner paper confirms the superiority of paper made from virgin kenaf bast fiber according to national standard of Iran (ISIRI 3054).

Keywords

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The effect of harvesing time on kenaf biomass and quality of carton top liner

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Volume 36, Issue 1 - Serial Number 74April 2021Pages 40-52

Volume 36, Issue 1 - Serial Number 74
April 2021
Pages 40-52