Fuji Manufacturing Co., Ltd.

Konishiroku Photo Industry Co., Ltd.

Toyo Engineering Corporation

Fuji Manufacuturing Co., Ltd.

Shozo Ishibashi

Keiji Mase

Yusuke Kondo

Masatoshi Kitagami

Yoshitaka Takahashi

Masashi Takahashi

Changming Zhao

Masahiko Naoe

Takahiro Matsuzawa

Genshi Nishikawa

Hiromichi Enomoto

Yuya Takahashi

Hirofumi Nakayama

Christian Ruslim

Tetsuya Kawabe

Keishi Sano

Takahiro Shima

Katsuyuki Takeda

Mizuki Sekizawa

Kimihito Haruta

Katsunori Yagoh

Yuichiro Wakashima

Takashi Kojima

Masao Kumagai

Kiyoshi Hoshikawa

A fluidized bed or fluidized bed/spouted bed granulator into which urea seed particles, an aqueous urea solution and air are introduced to produce urea particles with an average particle size of 1 mm or more. The granulator includes a box-shaped granulation chamber with a bottom floor, a top and side surfaces. Inner wall surfaces of the chamber are of a metal plate material, an upper part of the side or top surfaces includes an exhaust outlet, the side surfaces or top surface includes an inlet for introducing the seed particles, the side surfaces include a collection port for the particles, the aqueous urea solution is introduced from the bottom floor or the side surfaces, the air is introduced from the bottom floor or the bottom floor and the side surfaces, and at least a portion of the inner wall surfaces of the granulation chamber is treated by surface roughening.

Fluidized bed granulator or fluidized bed/spouted bed granulator

A re-circulatory blasting device obtained is capable of performing stable treatment for a prolonged period of time even in cases in which an elastic abrasive employed has abrasive grains adhered to the surface of elastic cores. An elastic abrasive regeneration device provided to the blasting device regenerates elastic abrasive employed for re-circulation. The elastic abrasive regeneration device includes a mixer and a combining unit. Recovered abrasive fed in from an abrasive recovery section is mixed in the mixer with abrasive grains fed in from an abrasive grain feeder, and the abrasive grains are adhered to the surface of the cores of the recovered abrasive. In the combining unit, the abrasive grains are pressed against and combined to the surface of the cores by passing an aggregated state of the recovered abrasive mixed by the mixer along a constricted flow path having a flow path cross-sectional area that gradually narrows.

Elastic abrasive manufacturing method, elastic abrasive manufacturing device, blasting method, and blasting device

A surface treatment method for preventing adhesion of powder to a powder-contacting member having a surface on which contacted powder flows in the form of a particle layer. The method includes performing surface treatment on the surface such that an arithmetic average peak curvature Spc (1/mm) of the surface is 150 to 400, a peak density Spd (piece/mm) of the surface is 10000 to 180000, a root mean square gradient Sdq of the surface is 0.05 to 0.30, and an arithmetic average height Sa (μm) of the surface is 0.02 to 3.00, and providing a space where an air layer can exist between the particle layer and the surface.

Powder contact member and method for surface treatment of powder contact member

A method for surface treatment of a DLC coated member that includes: taking as a treatment subject a DLC coated member having a DLC film coated on a base material surface; ejecting substantially spherical ejection particles having a median diameter of from 1 &#x3bc;m to 20 &#x3bc;m and a falling time through air of not less than 10 s/m against a surface of the film of the member at an ejection pressure of from 0.01 MPa to 0.7 MPa; and forming dimples on the surface of the film without exposing the base material so that a total projected area of the dimples is 50% or more of a treated region and so that the surface of the DLC film is processed to an arithmetic mean height (Sa) of from 0.01 &#x3bc;m to 0.1 &#x3bc;m and a texture aspect ratio (Str) of 0.4 or more.

Method for surface treatment of DLC coated member

A method for surface treatment of a workpiece made from a hard-brittle material comprises first blasting employing abrasive grains of higher hardness than a hardness of a base material of the workpiece for forming a three dimensional recess-protrusion profile having protrusions and recesses formed between the protrusions on a surface of the workpiece; and second blasting employing an elastic abrasive having a structure in which abrasive grains carried in and/or on an elastic body made from material with low rebound elasticity for polishing the surface of the workpiece formed with the recess-protrusion profile so as to achieve an arithmetic average roughness Ra of not greater than 1.6 &#x3bc;m on the surface of the protrusions and the recesses on the workpiece while maintaining the recess-protrusion profile formed by the first blasting.

Method for surface treatment of workpiece made from hard-brittle material

The present invention is directed to provide a method of forming dimples comparatively simply on a surface of hard-brittle materials such as ceramics by post-processing. In the method, substantially spherical ejection particles having a median diameter d50 of from 1 &#x3bc;m to 20 &#x3bc;m are ejected together with a compressed gas at an ejection pressure of from 0.01 MPa to 0.7 MPa against a dimple formation region which is a region where dimples are to be formed on a surface of an article made from a hard-brittle material or a surface of an article having a surface coated with a coating layer of a hard-brittle material, or the like so as to form dimples on the surface of the hard-brittle material by plastic deformation without occurrences of breaks or cracks.

Method of forming fine dimples in a hard-brittle material surface

A surface treatment method is provided that is capable of raising the slidability of a ceramic surface at low cost using a comparatively simple method. Dimples are formed on a surface of a treatment region, this being a portion of a ceramic surface where surface treatment is to be performed, by ejecting substantially spherical ejection particles having a median diameter of from 1 &#x3bc;m to 20 &#x3bc;m, together with compressed gas at an ejection pressure of from 0.01 MPa to 0.7 MPa, so as to achieve a value of a fastest decay autocorrelation length of not less than 10. The dimples are formed so as to have a plan view profile with a ratio between a horizontal Feret diameter and a vertical Feret diameter of from 0.7 to 1.43. Thereby a ceramic surface with improved slidability can be obtained regardless of use or non-use of a lubricant.

Method of surface treatment for ceramic and ceramic article

An artificial toothto be polished is fixed at a tooth neckside and rotated about a tooth axis. Abrasives, preferably elastic abrasives formed by kneading abrasive grains into or supporting abrasive grains on an elastic material, are ejected together with a compressed gas at an ejection pressure of from 0.1 MPa to 0.5 MPa onto an occlusal portionside of the artificial toothwhile the artificial toothis being rotated. The abrasives are ejected at an inclination angle &#x3b8; with respect to the tooth axisof the artificial toothof from 0&#xb0; to 90&#xb0;, and preferably from 15&#xb0; to 75&#xb0;. Portions on the occlusal portionand side surfacesof the artificial toothare thereby polished at the same time by the abrasive sliding over these portions.

Method for polishing artificial tooth and device for polishing artificial tooth

A method of treating a surface of a mold. The method includes forming dimples on a surface of a mold by ejecting substantially spherical ejection-particles so as to bombard the surface of the mold. The dimples are formed so as to satisfy a condition defined by the following formula:1+3.3&#x2264;3+13.4wherein W is an equivalent diameter (&#x3bc;m) of the dimples and H is a base metal hardness (Hv) of the mold.

Mold surface treatment method and mold treated with said method

To obtain a circulation-type blasting device which enables stable processing for a long period of time even in a case that an elastic abrasive of which abrasive grains are attached to a surface of an elastic core are used. A circulation-type blasting device is provided with a device for recycling an elastic abrasive for recycling all or a part of elastic abrasive used in a cyclic way, and the device for recycling the elastic abrasive is provided with a mixing unit for mixing recovered abrasives recovered from an abrasive recovery unit and abrasive grains introduced from an abrasive grain supplying unit in a gas flow by introducing the abrasive grains and the recovered abrasive in the gas flow to generate a solid-gas biphase flow, and a combining unit composed of at least one bent space to which the solid-gas biphase flow is introduced.

Method and device for manufacturing elastic abrasive method for blasting the elastic abrasive including method for recycling the elastic abrasive and device for blasting the elastic abrasive including device for recycling the elastic abrasive

An elastic abrasive with abrasive grains dispersed in or adhered to an elastic base material is ejected toward a side portion of a substrate together with compressed air. The elastic abrasive is ejected toward a predetermined processing area centered on a processing point in an ejection direction that intersects a widthwise line at the processing point and that forms a predetermined inclination angle selected from a range of 2&#xb0; to 60&#xb0; relative to a contact line. Moreover, an ejection nozzle and the workpiece are moved relatively to each other so that the processing area is moved at a fixed speed in a circumferential direction of the workpiece and so that the ejection direction is maintained at each processing point after moving. If multiple stacked substrates are to be processed, the processing area is moved at a fixed speed also in a widthwise direction of the substrates.

Method for grinding side portion of stacked hard, brittle material substrate

A long-lasting elastic grinding material capable of subjecting surfaces of objects to mirror-finishing, glossifying and the like via blasting thereof. A nucleus () is obtained by granulating a crosslinked polyrotaxane compound having self-tackiness and a rubber hardness of 30 or less into particles of a prescribed diameter. The nucleus (), which is soft and exhibits significant deformability, is sealed on the inside of an abrasive-particle layer () by: adhering abrasive particles () to the surface of the nucleus (): then affixing the abrasive particles () to the surface of the nucleus () by applying pressure to the surface of the nucleus () to which the abrasive particles () are adhered; and forming the abrasive-particle layer (), which has a masonry-like structure formed by attaching a plurality of the abrasive particles () in the thickness direction to the surface of the nucleus (), by further subjecting the surface of the nucleus () to which the abrasive particles () are affixed to repeated adhesion of identical abrasive particles () and affixing by application of pressure.

Method for producing elastic grinding material, elastic grinding material, and blasting method using said elastic grinding material

A cutting method by sandblasting in which cutting through of a workpiece and/or formation of a through-hole in the workpiece are/is performed by forming a resist on a plate-shaped workpiece and projecting abrasive against the workpiece to cut a portion of the workpiece where no resist is formed, comprises the steps of: forming the resist in a predetermined pattern on a front surface and a back surface of the workpiece symmetrically between the front and back by inkjet printing, and projecting the abrasive against each of the front and back surfaces of the workpiece to make a cut from the front surface side communicate with a cut from a back side at an approximately intermediate position of a thickness of the workpiece.

Cutting method by sandblasting

An abrasive that can impart a mirror finish, glossiness, or the like to a surface of a workpiece by blasting is provided. A crosslinked polyrotaxane compound having a network structure where crosslinking points are circular molecules of polyrotaxane and also having abrasive grains dispersedly mixed therein is obtained by causing chemical bonding between the circular molecules of the polyrotaxane in a state where the abrasive grains and the polyrotaxane are mixed. Then, the crosslinked polyrotaxane compound is granulated to a predetermined grain diameter to obtain a gel-like abrasive where a part of the dispersedly mixed abrasive grain is exposed at the surface. By using the thus-obtained gel-like abrasive in blasting by projecting the abrasive at an angle tilted with respect to a surface of a workpiece, mirror finishing or the like is possible without making the surface of the workpiece pearskin-like.

Growing community of inventors

Tokyo, Japan

Shozo Ishibashi