Solid material comminution or disintegration – Apparatus – Loose grinding body comminutor
Patent
1998-07-21
2000-02-29
Husar, John M.
Solid material comminution or disintegration
Apparatus
Loose grinding body comminutor
241172, 241174, 241179, B02C 1716
Patent
active
060299207
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a dispersing apparatus for performing a process for dispersing a material, which is a raw material of a mill base, in which, for example, powder pigment is dispersed in a varnish or a solvent at a high concentration, and more particularly to a dispersing apparatus in which the distance for which the material to be dispersed is moved in a vessel thereof is elongated so as to sufficiently disperse the material.
BACKGROUND ART
For example, ink for printing and a coating material have been manufactured by using a mill base in which powder pigment is dispersed in a varnish or a solvent at a high concentration. It is preferable that a process in which powder pigment is dispersed in a solvent or the like be performed such that powder pigment of secondary particles in a state where primary particles of the pigment have been aggregated are crushed and dispersed in a solvent to form fine pigment particles in which coarse particles do not exist in order to improve the coloring power of the ink for printing or the coating material.
Hitherto, as the dispersing apparatus, a sand mill, a grain mill, a ball mill, an attritor and the like have been known. Among the dispersing apparatuses above, a structure for continuously performing the dispersing process and arranged as shown in FIG. 7 has been known.
That is, the structure is a horizontal structure having a cylindrical vessel 101 disposed horizontally. In the vessel 101, a rotational shaft 103 is horizontally and rotatively disposed. A plurality of pin type stirring blades 105 projecting in the radial directions are provided for the rotational shaft 103 to be disposed apart from one another at arbitrary intervals in the axial direction. In the vessel 101, spherical particle media 107 made of, for example, steel, ceramics or stones, are enclosed in order to perform the process for dispersing the material.
With the foregoing structure, when the rotational shaft 103 is rotated by a motor or the like and a raw material for a mill base is supplied through a supply port 109 formed at an end of the vessel 101, the particle media 107 are stirred by the plurality of stirring blades 105 provided for the rotational shaft 103. Therefore, the process for dispersing the raw material for the mill base can be performed. The mill base, subjected to the dispersing process, is continuously discharged through a discharge port 111 formed at another end of the vessel 101.
The foregoing structure sometimes encounters a so-called short pass in which the raw material for the mill base supplied into the vessel 101 through the supply port 109 cannot uniformly be dispersed and therefore the mill base containing coarse pigment particles is discharged through the discharge port 111. Therefore, there arises a problem in that the dispersing process cannot satisfactorily be performed.
When the movement of the particle media 107 is observed, the particle media 107 are in a tendency to follow the rotation of the stirring blades 105 provided for the rotational shaft 103 and rotate together with the same. Therefore, there arises a problem in that the dispersing process cannot effectively be performed.
If the rate of charging the particle media 107 into the vessel 101 is raised in order to prevent the short pass, the short pass can somewhat be prevented. If the rate of charging the particle media 107 Is raised excessively, a choking phenomenon takes place in which the particle media 107 are, in the J101, moved eccentrically toward the discharge port 111. Thus, another problem arises in that the operation cannot be performed safely. Accordingly, the rate of charging of the particle media is generally determined to be 75 to 80% at the time of performing the operation.
A conventional structure shown in FIG. 8 can be available. The structure is a vertical structure in which a cylindrical vessel 101 is disposed vertically. A rotational shaft 103 having stirring blades 105 is vertically and rotatively disposed.
The foregoing structure is formed by converting th
REFERENCES:
patent: 3199792 (1965-08-01), Norris, Jr.
patent: 4673134 (1987-06-01), Barthelmess
patent: 4919347 (1990-04-01), Kamiwano et al.
patent: 5544825 (1996-08-01), Stehr
Dohi Makoto
Shimizu Hideo
Husar John M.
Toyo Ink Manufacturing Co. Ltd.
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