Investigation on the Influence of Paper Making Variables on Apparent Density of Paper Produced From Old Corrugated Container

تحقیقات علوم چوب و کاغذ ایران

Sayed mehdi Manzor alajdad¹  Ali akbar Enayati²  Ahmad Jahan latibari³  Omid Ramazani⁴  Mohammad mehdi Faezipoor⁵ 

[1] Associate Prof. Wood and Paper Science and Technology, University of Tehran Manager, Research and Development Dept. Iran Wood and Paper Industries;Associate Prof. of Natural Resources College of Tehran University;Islamic Azad University, Karaj, Iran;Ph.D. student at Wood and Paper Science and Technology, University of Tehran;Prof., Wood and Paper Science and Technology, Tehran University;

关键词: Apparent density;    freeness;    DRYING TEMPERATURE;    drying pressure;    tensile strength;    restrained drying;    Free drying;   

DOI  :  10.22092/ijwpr.2007.117417

来源: DOAJ

【 摘 要 】

Apparent Density of paper is the most effective physical property which directly and indirectly affects most of the strength and optical properties of paper such as tensile strength, modulus of elasticity, light scattering coefficient as well as the bonded area between fibers. Since paper making variables influences the apparent density of paper, in this study, the influence of OCC pulp freeness, and drying conditions are investigated.  The influence of three freeness levels of 350,450, and 550 CSF, drying under strain and unstrained, drying temperatures of 100, 150, 200 C and drying pressure of 7 and 10 kg/cm2 are studied. The relationship between paper making variables and apparent density is developed. All measurements of apparent density were analyzed using Minitab 15 and regression model between independent variables was calculated. The results showed that both pulp freeness and drying temperature had the highest impact on apparent density and both factors increased the apparent density.  The response of apparent density of the hand sheets dried at 200 ◦C varied considerably and was analyzed thoroughly.  Higher pressure increased apparent density of the sheets. The combined effect of variables is also considered. The combined effect of pulp freeness and drying temperature caused lignin softening and delamination. However, the influence of increasing the drying pressure for unrefined and less refined pulp is not significant.  Furthermore, for unstrained drying, the influence of freeness on apparent density was more than strained drying. Manufacturing of more desirable quality papers would be possible considering the obtained results and the effect of Apparent Density on paper strength properties.

【 授权许可】

Unknown