Showing papers on "Jet mill published in 1996"

Physicochemical Properties of Hull-less Barley Flours Prepared with Different Grinding Mills

Abstract: During the pearling process of hull-less barley, protein, lipid, ash and insoluble dietary fiber (IDF) contents decreased, while soluble dietary fiber (SDF) and contents slightly increased. Depending on milling methods and types of grinding mills used, there were differences in particle size distribution of barley flour. Flour particle size was smaller in the following order of Fitz mill, Ball mill, Pin mill, Cyclotec sample mill and Jet mill. Color (brightness) was closely related to the particle size of barley flour. Damaged starch (%) in pearled barley flour was the highest in Jet mill among different mills. Flours prepared with Cyclone mill and Pin mill had a reasonable amount of damaged starch. Flour produced by Fitz mill showed the lowest amount of damaged starch. Scanning electron microscopy (SEM) of the flour samples demonstrated different sizes and shapes of particles consisting of starch granules and cell wall materials. Damaged starch tended to increase water absorption index (WAI), water solubility index (WSI), and water retention capacity (WRC). Pasting viscosity determined by amylograph was relatively high in Pin-milled and Cyclone-milled flours. Viscosity was the lowest in coarsely ground flour by Fits mill.

Device for fluidized-bed jet milling

Abstract: The present invention pertains to a fluidized-bed jet mill intended to overcome the problem whereby a fluid jet introduced into the fluidized bed at high velocity takes up solid particles from the fluidized bed mainly in the area of the jet near the circumference. To have solid particles in the core area of the fluid jet as well auxiliary jets with fluidized solid particles are caused to penetrate into the fluid jet to be introduced into the fluidized bed such that the solid particles reach the core area of the fluid jet to enrich the core area with solid particles and allow an area near the circumference to receive solid particles from the fluidized bed.

Non-Aqueous Secondary Battery and a Manufacturing Method of Graphite Powder

Abstract: The object of the present invention is to provide a carbon material having superior reversibility in lithium intercalation/de-intercalation reaction, and a non-aqueous secondary battery using the carbon material as an active material for its negative electrode, which has a high energy density and excellent rapid charging and discharging characteristics. Graphite powder having a maximum particle diameter of less than 100 µm and less than 20 % of rhombohedral structure in the crystalline structure is used as an active material for the negative electrode of the non-aqueous secondary battery. The graphite powder can be obtained by pulverising raw graphite with a jet mill and subsequently treating the powder at a temperature equal to or higher than 900 °C.

Powder having improved release property and its production

Abstract: PROBLEM TO BE SOLVED: To safely produce the subject powder without using an organic solvent, at a low cost, having improved releasing properties of a hardly soluble material and useful for medicines, cosmetics, etc., by burying the hardly soluble material in starch and thereafter applying a dynamic stress thereon. SOLUTION: The objective powder holding a hardly soluble material in modified porous starch granules is obtained by burying a hardly soluble material (e.g. indomethacin) in a porous starch obtained by acting an enzyme having raw starch- degrading ability (e.g. amylase) on the starch (e.g. corn starch), and thereafter applying a dynamic stress thereon. The application of the dynamic stress is performed by using not only a ball mill, a hammer mill and a vibrating mill but also a jet mil, etc. In the case of the ball mil, the powder holding the hardly soluble material in the modified starch is obtained by changing the structure of the porous starch into an α-structure while enclosing the hardly soluble material therein by impact because the porous starch has viscoelasticity, and in the case of the jet mill, the powder of the modified starch with the attached hardly soluble material is obtained by finely milling the porous starch carrying the hardly soluble material together with the hardly soluble material.

Jet milling of agrichemical feedstocks

Abstract: A system for reducing the particle size of particulate substances and classifying the resulting particles includes a compressor, a jet mill and a series of separators. The compressor is connected to the jet mill by a feed pipe, and a hopper for particulate substances discharges into the feed pipe. The compressor, jet mill and separators are arranged in series and a recirculating pipe runs from the last separator back to the compressor. The compressor is driven by a combustion engine having an outlet for exhaust gases. The outlet is connected to the recirculating pipe by way of a catalytic converter and a cooling unit. The catalytically converted exhaust gases provide an inert atmosphere for the jet mill and function as a carrier for particulate substances admitted into the feed pipe.

Propolis food producing method and propolis food

Abstract: A propolis piece is comminuted into fine grains or further into colloid to produce a propolis food which is easy to eat. The comminution is achieved using one of a rolling ball mill, a vibrating mill, a tower mill, a medium agitating mill, a roller mill, a high-speed tumbling mill, a jet mill, a planetary mill and an attrition mill.

Electrode material of secondary battery

Abstract: PURPOSE: To provide negative electrode material for a secondary battery, especially for a lithium secondary battery having high charging/discharging capacity and efficiency. CONSTITUTION: Electrode material for a secondary battery is graphite having a particle size of 1-100μm and a purity of 90% of more, obtained by milling flake natural graphite with a jet mill. When the graphite is charged/discharged at a voltage of 0.02-0.5V, charging/discharging capacity obtained on and after a second cycle is 250mAh/g or more.

Production of material powder for r-fe-b based permanent magnet

Abstract: PURPOSE: To enhance the magnetic characteristics of a magnet alloy by casting a molten alloy principally comprising R, Fe and B into a piece of predetermined thickness by a predetermined method, collapsing the cast piece by feeding H2 gas thereto and then crushing the collapsed cast piece by means of a jet mill thereby pulverizing the collapsed cast piece efficiently. CONSTITUTION: A molten alloy containing 10-30at.% of rare earth element R including Y, 2-28at.% of B, and the remainder of Fe and inevitable impurities is subjected to strip casting to produce a piece of thin plate of 0.03-10mm thick having such texture as an R-rich layer is separated to be 5μm or less. The cast piece is placed in a vessel into which H2 gas is fed at 200Torr-50kg/cm to produce a collapsed alloy powder which is then subjected to dehydrogenation. Consequently, a coarsely crushed powder powder having average particle size of 10-500μm is obtained and admixed with 0.02-5.0wt.% of a lubricant. Finally, it is subjected to jet mill crushing in an inert gas flow to produce a fine powder having average particle size of 1-5μm. This method produces a powder having uniform particle distribution efficiently and the magnetic characteristics of a magnet alloy is enhanced.

Production of tableted product such as of crude drug or the like

Abstract: PURPOSE: To obtain the subject high-yield product formulated with 100% of the active ingredient, simplified in production process and obviated in the necessity of its sterilization, by coarsely grinding a stock such as a crude drug followed by pulverization and then directly tableting the resultant fine particles. CONSTITUTION: First, a stock of crude drug such as Panax ginseng C.A. Meyer is coarsely ground. Subsequently, the resultant coarse granules are pulverized into fine particles (pref. 0.5-10μm in diameter) which are then directly tableted to obtain the objective product. The pulverization is pref. carried out as follows: a jet mill is charged with the coarsely ground particles under supersonic air jet and the particles are ground into fine particles through mutual collision and their collision with the wall. It is recommended that the particles be sterilized along with the pulverization by heat generated due to high-speed rotation of the jet mill.

Process for the preparation of ceramic sintering

Abstract: The ceramic extrusion molded body is manufactured by mixing ceramic materials containing alumina, silica, zirconia, cordierite, mullite, silicon nitride and silicon carbide or their mixture and an organic additive such as methyl cellulose, polyvinyl alcohol, hydroxypropyl methyl cellulose, carboxy methyl cellulose, starch or gum arabic homogeneously for 5-60 min. without a dispersive solvent in the jet mill. The classifier of the jet mill is rotated with the rotational speed of 100-500 rpm, the high pressure tank at the mill maintains the pressure of 5-10 bar. The mixing process comprises the pulverization and mixing steps in reciprocal collision with particles in high speed air stream.

Process for preparing a cracker(gang jung)by employing an ultrating powder of glutinous rice

Abstract: The process for preparing a cracker called Gang-jung comprises the steps of (1) drying sticky rice at 30-50 deg.C to 6-8% water content, (2) grinding with one of pin mill, jet mill, roll mill or impact mill to 0.5-20 micron size, (3) discarding protein particles by Turboplex classifier, (4) kneading the remaining starch particles and shaping, (5) drying at 30-50 deg.C for 5-24 hours to 5-20% water content and (6) frying at 110 deg.C and again at 180 deg.C for 10 seconds. This process saves the soaking process and prevents spoilling.

Production of charge controlling agent

Abstract: PURPOSE: To efficiently produce a charge controlling agent in a fine powdery state having a uniform particle size distribution to be used for an electrostatic charge image developing toner and the like by pulverizing and classifying the agent by using a pulverizing machine equipped with an air classifying mechanism. CONSTITUTION: The charge controlling agent for an electrostatic charge image development is pulverized and classified by using a pulverizing machine equipped with an air classifying mechanism. The air classifying mechanism is a means to produce the convection of particles by blowing and to classify particles during blowing by differences in gravity, centrifugal force or inertia force given to the particles. As for the pulverizing machine equipped with the air classifying mechanism, a pin mill or a jet mill can be used. In a pin mill, for example, interaction of impact and repulsion is added to the material by the pins attached to a disk in the machine to pulverize the material. The pin mill also has a classifying function. In a jet mill, strong impact and friction is added to the material in a jet air flow to pulverize the material. The machine also has a classifying function. The average particle size of the charge controlling agent thus pulverized and classified is 0.01 to 50μm, and more preferably 0.1 to 15μm.

Manufacture of thermoplastic polymer and thermoplastic polymer fiber

Abstract: PURPOSE: To adapt to multiking various difference system or small lot changing- over production by a method wherein melt thermoplastic polymer dispersed with pigment particles is produced by carrying out a contact-mixing of gas carrier, in which the pigmentary particles are dispersed, with melt thermoplastic polymer. CONSTITUTION: By grinding agglomerated particles of pigment through the simultaneous feeding of the particles to a jet mill and compressed nitrogen gas to the mill, the produced particles are dispersed in nitrogen gas carrier. By feeding melt thermoplastic polymer under molten state to one flow path 3b of a two fluid nozzle 3a and simultaneously feeding pigment particle- dispersedly-containinig nitrogen gas carrier to the other flow path 3c, both of them are directly mixed with each other so as to produce melted thermoplastic polymer, in which the pigment particles are dispersed. Next, the resultant polymer is introduced in a polymerization tank so as to perform mixing of the polymer and separation of the carrier. After that, the obtained pigment particle-dispersed melted thermoplastic polymer is pelletized and fiberized directly.

Micronizer type jet mill

Abstract: PURPOSE: To stably pulverize particles of high tackiness in a micronizer type jet mill for pulverizing particles by forming a thin film of diamondlike carbon or diamond on the inner wall surface of a plate-shaped liner and a disc-shaped top board constituting a pulverizing chamber. CONSTITUTION: A pulverizing chamber 1 of a micronizer type jet mill is a space consisting of a plate-shaped liner 2, a disc-shaped top board 3 and the vertical part of a housing 12. By jetting gaseous nitrogen and rare earth magnet raw powder together from a nozzle 4, a turning flow is generated in the pulverizing chamber 1 and a classifying chamber 5 to pulverize particles. After the pulverized particles are classified in the classifying chamber 5, fine particles are discharged as fine powder from a collecting pipe 14. In this case, a thin film of diamondlike carbon or diamond is formed on the inner wall surface of the plate-shaped liner 2 and the disc-shaped top board 3. In this way, the inner wall of the pulverizing chamber 1 excels in sticking preventive property and wear resistance, and the particles diameter of the obtained fine powder is stabilized for a long time.

Properties of Fine Superconducting YBCO Particles Prepared by Dry- and Wet-Type Jet-Mill

Abstract: Small YBCO particles which has an average size of 1–2 µm were prepered from high quality YBCO pellets by dry-type jet-mill system. The resulting small YBCO particles were further pulverized by wet-type jet-mill system in a high pressure flow of MEK(methyl-ethyl-keton:CH3COCH2CH3) or toluene(C6H5CH3).As a result, the fine YBCO particles prepared by wet-type jet-mill with MEK showed superconducting properties with Tc at 92K or more obtained from the experimental susceptibility curves as a function of temperature.