JPH01249130A - Method for mixing or dispersing particles - Google Patents

Abstract

PURPOSE:To uniformly mix or disperse particles by inserting or placing an electrode body coated with a dielectric for forming an electric field curtain in a layer of the particles and by electrostatically charging the particles by contact with the dielectric. CONSTITUTION:The electrode body 2 coated with the dielectric 4 for forming the electric field curtain is inserted or placed in a layer 1 of particles to be mixed or dispersed. Standing-wave or traveling-wave voltage is impressed on the electrodes 5, 6 of the electrode body 2 to form an alternating unequal electric field between the electrodes. The particles are electrostatically charged by contact with the dielectric and vigorously agitated by the action of the electric field curtain, so the particles can be uniformly mixed or dispersed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for mixing and dispersing particles by applying the principle of a contact type electric field curtain.

[Prior Art] A contact type electric field curtain is a group of electrodes for configuring an electric field curtain, as described in Japanese Patent Publication No. 12667/1988 (Method for Configuring a Contact Type Electric Field Curtain and Contact Type Electric Field Curtain Device Using the Same). A dielectric layer is placed in close proximity to or in contact with the dielectric layer, and a light-moving object on the dielectric layer obtains a contact charge due to contact charging with the surface of the dielectric layer, receives the electrodynamic action of the electric field curtain, and the dielectric layer It is driven by repulsion from the layer.

This will be explained with reference to FIG.

By arranging mutually insulated rod-shaped or annular electric field curtain forming electrodes a in a row and applying an alternating voltage between the adjacent electrodes 8, an electric force as shown by the dotted line in the figure is generated within each electrode a. An alternating unequal electric field with lines C is formed. Needless to say, the alternating unequal electric field with lines of electric force formed between the shafts a changes spatially in both magnitude and direction, and its direction is accurate chordwise in time. are alternated, forming an alternating unequal electric field array.

When a charged particle approaches this electric field region, it receives an alternating electric force in the direction along the electric field line C, and is photographed along the curved electric force 11c, and every half cycle of the photographing, the field line C is subjected to a pulsating centrifugal force in an outward direction perpendicular to . As a result, an average centrifugal force Fc acts on the particles.

In addition, due to the fact that the imaging phase of particles is due to vibration in a viscous medium, in a place with a strong electric field near electrode a, the electric force in the direction away from electrode a is reversed, and conversely, the electric field far from electrode a As a result of receiving an electric force in the direction toward the electrode a at a place where the force is weak, an average gradient force FO along the electric force line C in the direction away from the electrode acts on the particle as a difference between the electric forces.

The average centrifugal force FC is the spatial change (curvature) in the direction of the lines of force C
Due to this, the gradient force F9 is an acting force generated due to a spatial change in the density of the lines of force C (field intensity gradient), and both arise from the fact that the electric field is unequal and alternating. As a resultant force of both, an electrodynamic repulsive force Fr in the direction away from the electrode array acts on the particles.

When a dielectric layer is placed in this electric field region, particles are charged by contact charging as soon as they adhere to the dielectric layer and come to float from the dielectric layer due to the electrodynamic repulsion described above.

[Problems to be Solved by the Invention] By the way, this contact type electric field curtain is used mainly in applications such as electrostatic precipitators, electrostatic coating booths, and electrostatic coating guns, where particles are removed or moved by repulsive force. Currently, it is used for

The present inventors created the present invention by paying attention to the fact that particles cause violent disturbance motion when they are within the action area of an electric field curtain.The purpose of this invention is to electrodynamically mix or mix particles. The object of the present invention is to provide a method for mixing and dispersing particles that can be dispersed.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a method of inserting or disposing an electric field curtain-forming electrode body coated with a dielectric material in a layer of particles to be mixed or dispersed. The particles in the layer are mixed or dispersed by applying a standing wave or traveling wave voltage to each electrode of the electrode body.

[Function] According to the above configuration, an electric field curtain forming electrode body coated with one 1ff body is inserted or disposed in a layer of particles such as several types of powder or one type of powder to be mixed or dispersed. However, by applying a high voltage to each electrode, an alternating unequal electric field is formed between each electrode, and the particles become charged due to contact with the dielectric material, causing violent disturbance movement due to the effect of the electric field curtain. ,
Uniform mixing or dispersion is possible.

[Embodiments] Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, 1 is a layer of particles to be mixed or dispersed;
Any type of powder that can be mixed or dispersed in the form of several types of powders, aggregated powders, or colloids, emulsions, or slurries may be used. For mixing and dispensing various drug powders, as well as mixing raw material powders for superconducting materials as new applications for fine ceramics, and additives for coloring and reinforcing plastics for injection molding. It can be used for mixing, mixing vitamin additives with flour in bread manufacturing processes, etc.

In addition, for dispersion, when powder particles aggregated within layer 1 are uniformly dispersed, slurry and colloid are used.

■It is used for uniformly dispersing powders and droplets in a emulsion.

The electrode body 2 for forming an electric field curtain coated with a dielectric material is obtained by winding a pair of spiral electrodes 5.6 covered with a dielectric material 4 around the outer periphery of an electrode support 3 made of an insulator such as a glass rod. A power supply device 9 such as a single-phase AC power source is connected to the picture electrodes 5 and 6 via conductive wires 7 and 8.

In this electric field forming electrode body 2, instead of forming and covering the electrodes 5 and 6 in a spiral shape as shown in FIG. 1, the electrodes 5 and 6 are formed in an annular shape as shown in FIG. 2, and these electrodes are supported. It can be connected to a power supply device 9 via conductive wires 7 and 8 provided inside the body 3, or as shown in FIG. It may also be configured to arrange.

Furthermore, instead of attaching the electrodes 5 and 6 covered with the dielectric material 4 to the electrode support 3, the electrode support 3 is made of fine ceramic, and the electrodes 5 and 6 are buried in the molding process, and then fired. The electric field curtain forming electrode body 2 may be covered with a dielectric material.

The power supply device 9 uses a traveling wave three-phase AC power source in addition to a standing wave single-phase AC power source.

Next, the operation of this embodiment will be explained.

First, when a single-phase AC power source is applied to the electrodes 5.6 of the electric field curtain forming electrode body 2, an unequal alternating electric field is formed between the electrodes 5.6 as explained in FIG. 4.

In this state, the electrode body 2 for forming an electric field curtain is attached to the layer 1 of particles.
If the particles are inserted into the layer 1 or placed in the layer 1 in advance, the particles in the layer 1 will undergo intense disturbance motion due to the electrodynamic action of the electric field curtain formed by the electric field curtain forming electrode body 2. As a result, the particles within layer 1 can be mixed and dispersed. At this time, if the electric field curtain forming electrode body 2 is mechanically moved within the layer 1, the particles within the layer 1 can be mixed and dispersed more evenly.

In addition, if this electrode body 2 for forming an electric field curtain is placed near the outlet of a hopper that stores and discharges various types of particles, bridging of the stored particles can be prevented and the discharge thereof can be improved.

[Effects of the Invention] As is clear from the above explanation, the present invention exhibits the following excellent effects.

(1) By inserting or disposing an electric field shadow forming electrode body coated with a dielectric material in a layer of particles, the particles in the layer can be charged by contact, and the particles can be mixed and dispersed uniformly.

(2) Unlike conventional mechanical mixing and dispersion, mixing and dispersion is achieved by the agitating movement of each particle, resulting in more complete mixing and dispersion.
Can be distributed.

[Brief explanation of the drawing]

FIG. 1 is a new front view showing an embodiment of the present invention, FIG.
FIG. 3 is a sectional view showing other embodiments of the present invention, and FIG. 4 is a diagram showing the principle of an electric field curtain. In the figure, 1 is a layer of particles, 2 is an electrode for forming an electric field curtain, and 4 is a particle layer.
is a dielectric, 5 and 6 are electrodes, and 9 is a power supply device.

Claims (1)

[Claims] 1. Insert or arrange an electrode body for forming an electric field curtain covered with a dielectric material into the layer of particles to be mixed or dispersed, and apply a standing wave or traveling wave voltage to each electrode of the electrode body. A method for mixing and dispersing particles, which comprises applying an electric current to mix or disperse particles within a layer.