絶縁紙表面の微視の構造に及ぼす繊維素平均重合度の影響

抄録

We have investigated the role of polymerization degree on the surface microstructure of insulating paper for power cable by means of the electronmicroscope.
When the pulp of _??_ 1, 650_??_445 is beaten to SR 40°, in the case of _??_ 1, 650, the surface is covered with S₁ wall layer and internal fibrillation of S₂ wall layer is incomplete. In _??_ 1, 270, it is clarified that most part of the S₁ wall layer is separated, and fine internal fibrillation parallel to the fiber axis is found. In such a microstructure, the values of the mechanical and electrical properties are found higher.
Under the _??_ 1, 000, fiber was partially cut and broken during beating, and then mechanical strength of paper was lowered. Moreover, it appears that the fibrillation of S₁ and S₂ wall layer is disproportionate. But most of the S₂ wall layer is internally less fibrillated, and the microstructure on the surface disordered.