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Patent
Kotobuki Industries Co. | Date: 2012-02-17

A straight-drum centrifugal dehydration device, wherein extraction of moisture from heavy phase built up in a bowl is facilitated to improve the dehydration effect, and compression efficiency is improved to achieve a reduced load. The straight-drum centrifugal dehydration device, wherein an outer peripheral surface of a rotary drum (


Inkyo M.,Kotobuki Industries Co. | Hagarty T.,Kotobuki Industries Co. | Arai T.,Marubeni Techno Systems America Inc.
Nanotechnology 2010: Advanced Materials, CNTs, Particles, Films and Composites - Technical Proceedings of the 2010 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2010 | Year: 2010

Kotobuki Industries has developed a new type of beads mill which has successfully solved many problems related to nanoparticle dispersion such as reaglomeration and damage to the crystal structure of nanoparticles. The Ultra Apex Mill uses centrifugation technology which enables the use of ultra small beads with a diameter of less than 0.05mm for the first time in the world. Now 0.015mm beads are available. This technology has pioneered practical applications for nanoparticles in various areas, such as composition materials for LCDs, ink-jet printing, ceramic condensers and cosmetics. Source


Tahara T.,Kotobuki Industries Co. | Tahara T.,Hiroshima University | Imajyo Y.,Kotobuki Industries Co. | Nandiyanto A.B.D.,Hiroshima University | And 4 more authors.
Advanced Powder Technology | Year: 2014

The low-energy dispersion of nanomaterials in the bead-milling process is examined. The effect of milling parameters including bead size, rotation speed, and milling time on the dispersibility of fragile rod-type titanium dioxide nanoparticles is investigated. From experimental data obtained for the morphological, optical, and crystalline properties of dispersed nanoparticles, an unbroken primary particle dispersion in colloidal suspension was obtained only by conducting the bead-milling process using the optimum milling parameters. Deviation from the optimum conditions (i.e., higher rotation speed and larger bead size) causes re-agglomeration phenomena, produces smaller and ellipsoidal particles, and worsens crystallinity and physicochemical properties, especially the refractive index, of the dispersed nanoparticles. We also found that decreases in refractive index induced by the milling process are related to collisions forming broken particles and the amorphous phase on the surface of the particles. In addition, the present low-energy dispersion method is prospective for industrial applications, confirming almost no impurity (from breakage of the beads) was apparent in the final product. © 2014 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved. Source


Tahara T.,Kotobuki Industries Co. | Inkyo M.,Kotobuki Industries Co. | Imajou Y.,Kotobuki Industries Co. | Ogi T.,Hiroshima University | Okuyama K.,Hiroshima University
Kagaku Kogaku Ronbunshu | Year: 2013

Titania nanoparticles were dispersed with a dual axis beads mill that enables nanoparticles to be dispersed with much lower energy than usual, and their dispersion characteristics were examined. In a recent study, titania nanoparti-cles were found to disperse to a primary nanoparticle size by evaluating the size and crystallinity of dispersed particles. In this study, the dispersed titania nanoparticles were further characterized by examining TEM, small angle X-ray scattering, ζ-potential, specifc surface area and optical properties. TEM revealed that the dispersion of titania nanopar-ticles at low energy gave the primary particle size without crushing the crystals, while dispersion at higher energy gave rise to coagulation of crushed titania nanoparticles of around 10 nm in size. Te large agglomerated nanoparticles were re-dispersed to around 10 nm by adding dispersant under the appropriate conditions to give a transparent titania slurry. © 2013 The Society of Chemical Engineers, Japan. Source


Inkyo M.,Kotobuki Industries Co. | Tahara T.,Kotobuki Industries Co. | Imajyo Y.,Kotobuki Industries Co.
IOP Conference Series: Materials Science and Engineering | Year: 2011

Two of the major problems related to nanoparticle dispersion with a conventional beads mill are re-agglomeration and damage to the crystalline structure of the particles. The Ultra Apex Mill was developed to solve these problems by enabling the use of ultra-small beads with a diameter of less than 0.1mm. The core of this breakthrough development is centrifugation technology which allows the use of beads as small as 0.015mm. When dispersing agglomerated nanoparticles the impulse of the small beads is very low which means there is little influence on the particles. The surface energy of the nanoparticles remains low so the properties are not likely to change. As a result, stable nanoparticle dispersions can be achieved without re-cohesion. The Ultra Apex Mill is superior to conventional beads mills that are limited to much larger bead sizes. The technology of the Ultra Apex Mill has pioneered practical applications for nanoparticles in various fields: composition materials for LCD screens, ink-jet printing, ceramic condensers and cosmetics. © 2011 Ceramic Society of Japan. Source

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