COMPARISON OF PLATE AND CONICAL FILLINGS IN REFINING OF BLEACHED SOFTWOOD AND HARDWOOD PULPS  

作　　者：K.Koskenhely K. Nieminen E. Hiltunen H. Paulapuro 

机构地区：[1]Helsinki University of Technology, Laboratory of Paper Technology. Adress: PL6300, Espoo, Finland.,Helsinki University of Technology, Laboratory of Paper Technology. Adress: PL6300, Espoo, Finland.,Helsinki University of Technology, Laboratory of Paper Technology. Adress: PL6300, Espoo, Finland.,Helsinki University of Technology, Laboratory of Paper Technology. Adress: PL6300, Espoo, Finland.

出　　处：《天津科技大学学报》2004年第A02期18-26,共9页Journal of Tianjin University of Science & Technology

摘　　要：The purpose of this study was to compare plate and conical refiner fillings in refining of softwood and hardwood pulp fibers. Contrary to expectations, better tensile strength values were achieved when BSW was refined with conical fillings and the development of strength was found to be insensitive to variations in refining intensity. A bar microprofile was measured with the aid of a profilometer. The leading edges of conical filling bars were found to be rounder. A possible reason for the better tensile strength of pulp refined with conical fillings is that the round edge helps large SW fiber flocs to enter the space between the bars, resulting in less heterogeneous or more efficient treatment of fibers. The recorded gap closure values supported the above interpretation. The gap between conical fillings was found to become wider when pulp consistency and thus fiber flocculation increased, whereas increased pulp consistency decreased the gap between plate fillings, which was further reflected as increased fiber cutting. The reduction in fiber length was proportional to the increase in gap closure, supporting the earlier theory that fibers are squeezed and crushed between the bars. More attention should be paid to the wear of filling materials when refining BSW. A filling material which wears so that the bar edges are rounded would seem to promote high tensile strength and high average fiber length.The purpose of this study was to compare plate and conical refiner fillings in refining of softwood and hardwood pulp fibers. Contrary to expectations, better tensile strength values were achieved when BSW was refined with conical fillings and the development of strength was found to be insensitive to variations in refining intensity. A bar microprofile was measured with the aid of a profilometer. The leading edges of conical filling bars were found to be rounder. A possible reason for the better tensile strength of pulp refined with conical fillings is that the round edge helps large SW fiber flocs to enter the space between the bars, resulting in less heterogeneous or more efficient treatment of fibers. The recorded gap closure values supported the above interpretation. The gap between conical fillings was found to become wider when pulp consistency and thus fiber flocculation increased, whereas increased pulp consistency decreased the gap between plate fillings, which was further reflected as increased fiber cutting. The reduction in fiber length was proportional to the increase in gap closure, supporting the earlier theory that fibers are squeezed and crushed between the bars. More attention should be paid to the wear of filling materials when refining BSW. A filling material which wears so that the bar edges are rounded would seem to promote high tensile strength and high average fiber length.

关 键 词：化学制浆纤维 圆锥形浆料 漂白软木 漂白硬木 精练 伸展度 杆材料 

分 类 号：TS74[轻工技术与工程—制浆造纸工程] TS72