Durian Fruit Skin Pulp To Enhance The Strength Characteristics Of Recycled Pulp Derived From Printed Paper Heated Using A Laser Printer

Abstract

PKD was processed with soda at 20% AA, a liquor-to-wood ratio of 4:1, and 170°C for 4 hours without bleaching. SWL underwent heat treatment in the printer, was fed five times at 160°C, and was subsequently repulped. The mixture of PKD and SWL was prepared at weight/weight compositions of 100/0, 75/25, 50/50, 25/75, and 0/100, with three freeness levels: 300 CSF, 200 CSF, and 100 CSF. The dimensions and derivative values for KD predominantly fall into fiber quality class II, except for felting power, which is classified as class III. SWL is categorized in quality class III. The solubility levels of ethanol-benzene, holocellulose, lignin, and α-cellulose for KD are 23%, 65.39-67.28%, 16.34-18.17%, and 41.16-42.38%, respectively. In 1% NaOH, the solubility hierarchy is as follows: fiber KD > PKD 300 CSF > PKD 200 CSF > SWL. Notably, the mechanical properties of the sheet pulp mixture diminished as the composition of PKD increased, likely due to PKD’s higher content of low-molecular-weight polysaccharides and elevated cellulose degradation. In contrast, the mechanical properties of SWL can be enhanced through beating.