機械パルプと非木材パルプ ＲＧＰ，ＴＭＰの製造

Abstract

The property of mechanical pulp strength is decided by fiber length, distribution of fiber length and fiber forms. The fine defiberization makes strong pulp with many ribbon fibers and fibrils. Refiner groundwood pulp (RGP) and thermo-mechanical pulp (TMP) has been developed to get fine mechanical pulp properties. However, there are few new RGP installations since TMP has been installed greatly in recent years. Therefore this paper reports on TMP process. TMP is significantly stronger than groundwood pulp or RGP and contains fewer shives. So TMP is used for newspaper and mechanical paper, and strong strength can reduce chemical pulp content. However, there is a fault that TMP consumes greater electric power to make strong strength. The importance for TMP process is temperature at presteaming and refining consistency. Those differences have an effect on the quality and properties of the pulp produced. As for equipment, generally refiner has used single disc. A standard flat type refiner is a 60-inch disc but recently 68-inch disc is developed. Conical type refiner mainly used in North America is available with up to 76-inch disc.