Jet mill

About: Jet mill is a research topic. Over the lifetime, 803 publications have been published within this topic receiving 5686 citations.

Breakage behavior of silicon carbide particles in a fluidized bed opposed jet mill

Abstract: The grinding process of silicon carbide(SiC) particles in a fluidized bed opposed jet mill was analyzed by population balance modeling.The model could be solved by a simple first Kapur function to obtain the selection and breakage functions.It was found that these two functions were related to some operating parameters such as inlet pressure,feed rate and distance between the nozzle outlet and meeting point in the mill.The breakage mechanism for SiC particles in the mill could be discussed by these functions.A polynomial for the Kapur functions was proposed to effectively simulate the product size distributions under various conditions.

Method for optimizing jet mill grinding condition

Abstract: PROBLEM TO BE SOLVED: To provide a method for efficiently and precisely setting jet mill grinding conditions for stably obtaining a powder having a specified grain size distribution SOLUTION: First, a plurality of factors influencing a grinding process are selected, then a plurality of levels are selected for every selected factor and the selected factor and the selected level are allotted to an orthogonal arrangement table according to an experimental planning method, and the grain is test-ground in accordance with grinding conditions based on the orthogonal arrangement table Further, the particle diameter (D 50 ) which accounts for 50% of the integrated grain size distribution (volume standard) from the small particle diameter side of the obtained powder, and/or the particle diameter (D 90 ) which accounts for 90% of the integrated grain size distribution (volume standard) from the small particle diameter side of the obtained powder, is measured Then, the scatter analysis of the measurements is performed, then the promising factors to D 50 and/or D 90 are specified, and the point estimation and the interval estimation of D 50 and/or D 90 are carried out at each level of the specified promising factors Further, the desired jet mill grinding conditions are decided according to the estimate and the confidence interval sought by the point estimation and the interval estimation COPYRIGHT: (C)2011,JPO&INPIT

Manufacture of composition for injection molding powder metallurgy

Abstract: PURPOSE:To obtain composition for injection molding powder metallurgy, which can be injection-molded to a product having excellent dimensional accuracy, by spheroidizing shape of irregular shaped metal powder made by the water atomizing method, etc., with mechanical treatment and kneading with the specific ratio of binder. CONSTITUTION:The molten metal is pulverized with the water atomizing method, etc., and the metal particles having irregular shape and <=50mum particle diameter are spheroidized with the mechanical means of impact type pulverizing machine, etc., such as jet mill, hammer mill. To 11 vol. parts of the spheroidized metal powders, 9 vol. parts of thermoplastic binder, such as ethylene polymer, wax, are added and sufficiently kneaded. This kneaded composition is injection- molded with an injection molding machine and by executing sintering after debinder treating, the injection-molded powder metallurgy product having excellent dimensional accuracy can be produced.

Method for inhibiting aggregation of tea leaf powder

Abstract: PROBLEM TO BE SOLVED: To provide a food and beverage in which tea leaf powder is excellently dispersed and a method for inhibiting aggregation of tea leaf powder. SOLUTION: The food and beverage comprises tea leaf powder adjusted to have 90% accumulated particle size under a screen of ≤10 μm, a median diameter of ≤3 μm and an average degree of circularity of 0.9-1.0. The tea leaf powder is prepared by using a jet mill having a discharge pressure of ≥0.8 MPa. COPYRIGHT: (C)2011,JPO&INPIT

Process for preparing ground resin particles and apparatus for preparing the same

Abstract: A process for preparing ground resin particles is provided by modifying a jet mill with opposed fluidized bed. By using a jet mill having a plurality of jet nozzles disposed at predetermined positions in a barrel of a grinding chamber toward the injection point of the grinding chamber and a bottom wall having a flat surface in part or in whole, parallel to the jet nozzles, or having a conical projection immediately below the injection point, resin particles to be ground are jetted with or without water, thereby being ground to obtain ground resin particles of an intended particle size.