Preface
Introduction of Advanced Technology of Seishin Enterprise Co. Ltd.
Seishin Enterprise Co.Ltd., Japan has faced powder handling with instruments and devices based on its science and technology for half a century. At the time of our founding in 1968, we started to develop powder analytical devices such as a micron photo sizer, a light transmission centrifugal particle size distribution measuring instrument. During the periods of such activity, we have recognized the importance in knowledge of the wide variety of powder materials, due to its base of many creative products around our social life. This makes us to involve into manufacturing functional powder materials, being supported with an aid of powder measuring instruments and devices. Now we have worked on the development of new equipment and devices focusing on automation system and its networking being suitable for the powder industrial field updated.
Technical Report
Oct.
2022 |
Establishment of both removal technique of PFOA as a by-product produced in a manufacturing low-molecular-weight PTFE powder and its extremely micro analysis method. |
[Abstract]
We have manufactured various grades of poly-tetra-fluoro-ethylene (PTFE) powder by irradiation of high-energy beam followed by dry milling recent years. This powder production method produces small amounts of per-fluoro-octanoic acid (PFOA) in the PTFE fine grades with particle size of several micron meters. PFOA is a kind of environmental pollutant and harmful substance, so that this material should be removed away from the PTFE powder at least down to the REACH regulated value of EU (25ppb). We have attempted to establish the reliable removal technique of PFOA from PTFE powder and its microscopic analysis method. This paper introduces briefly our techniques and micro analysis method. The former technique is based on an extraction using organic solvent, and the latter method makes full use of a liquid chromatography/tandem mass spectrometry. In short, we succeed the removal of PFOA down to approximately 10 ppb, which is lower than the EU REACH regulated value (25ppb). |
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June 2021 |
Development of a Device called NSM enabling Spheroidization, Agglomeration and Surface Coating for Powder Particles |
[Abstract]
In this paper, we introduce a new type of powder particle shape control equipment "NSM", developed by our company, that enables spheroidization, granulation and surface coating for powder particles. NSM. Natural Graphite Spheroidization Machine, its original goal was to spheroidize the irregular shape of graphite powder particles. Graphite powder is manufactured by grinding, but its particle shape is irregular in general. If the particle shape becomes spherical by some way, the powder filling structure will be dense, leading to well electric conductivity when it is used as electrode, for example. This was the motivation of our development group, and they have challenged to develop a device, which is composed of a vertical powder processing container in which a high-speed rotor with blades is installed at the center of its bottom. As a result of the equipment operation by filling graphite powder into the container, it was confirmed that the particle shape of graphite can be spheroidized. Further, when the NSM was operated by adding a binder to the graphite powder, it was clarified that the graphite powder is granulated into the moderate particle size. The tap density of the granules is found to be improved. Furthermore, as an example, when polyethylene resin (PE) powder (particle size:100 to 200μm) and graphite powder (average particle size: about 8μm) are treated with the NSM, it is confirmed that the surface of the polyethylene (PE) particles is coated with graphite fine particles.
As described above, the NSM is an equipment for spheroidization of graphite, but from a number of subsequent experiments, it is confirmed that its capability can extend to other powders besides graphite. Thus, we appreciate very much if you could utilize the NSM for your samples’ spheroidization, granulation and surface coating. |
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