The Relationship between the Flocculation State of Particles and the Packing Structure on the Surface of Gypsum Mold [Translated]†

• Main Authors: Masafumi Arakawa, Hideki Kobayashi, Kei-ichiro Hirado, Keikichi Inoue
• Format: Article
• Language: English
• Published: Hosokawa Powder Technology Foundation 2014-06-01
• Series: KONA Powder and Particle Journal
• Online Access: https://www.jstage.jst.go.jp/article/kona/8/0/8_1990007/_pdf/-char/en

Generally a slip-casting process is closely related to the flocculation state of particles. The present investigation was undertaken in order to understand the relationship between the flocculation state of the particles and the packing structure on the surface of gypsum mold. The flocculation state of particles in an Al2O3 -slurry was discussed on the basis of rheological and sedimentation behavior as a function of dispersant concentration. It was found that these properties could be classified into three modes. On the slurries, the rate and pressure in the absorption of water, the increase in the packing layer thickness, and the porosity and permeability of the packing layer were measured in order to explain the packing structure on the surface of mold. From these measurements, the relationship between the flocculation state of the particles and the packing structure could be modelled.† This report was originally printed in J. Soc. Powder Technology, Japan. 25(9), 585-590 (1988) in Japanese, before being translated into English by KONA Editorial Committee with the permission of the editorial committee of the Soc. Powder Technology, Japan.