JPH08983Y2 - Powder surface modification device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a powder surface reforming apparatus.

[Conventional technology]

For the purpose of producing functional particles such as electronic toner, pharmaceuticals, cosmetics, biochemicals, electronic materials, etc., or for various powders such as fluidity, dispersibility, wettability, color tone, particle size distribution, electromagnetic characteristics, taste, etc. For the purpose of improving the physical properties, it has been customary conventionally to coat the surface of a mother particle serving as a core with a fine particle child to form a composite, which is then subjected to an immobilization treatment or a film formation treatment. .

There is a conventional processing device shown in FIG. This device is provided with a hot air supply cylinder 21 on the outer peripheral upper part of the tower 20, and blows hot air from the supply cylinder 21 into the inside of the tower 20 to swirl it, and from the raw material supply port 22 formed in the upper part of the tower 20 into the inside of the tower 20. The composite A is supplied to connect with the hot air.

[Problems to be solved by the device]

By the way, in the above apparatus, since the hot air blown from the supply cylinder 21 is swirled inside the tower 20, the temperature of the tower 20 becomes high, and the composite A
Often move and thus adhere to the inner diameter surface of the tower 20 or adhere to each other.
For this reason, the fluidity of the composite is poor, and the temperature of the hot air cannot be raised.

In addition, since the temperature cannot be increased, the composite cannot be spheroidized, and child particles cannot be reliably attached to the mother particles.

Therefore, the present invention solves the above-mentioned inconvenience, and improves the surface of the powder so that the complex in which the surface of the mother particle is coated with the child particle can be extremely efficiently and surely fixed or film-formed. It is a technical challenge to provide quality equipment.

[Means for solving the problem]

In order to solve the above problems, in the present invention, around the hot air jet nozzle, toward the hot air jetted from the nozzle, a composite in which fine particle child particles are coated on the surface of the mother particles serving as the core. A plurality of composite injection nozzles for injection are provided at equal intervals, and a composite collection hood and a collector for the composite, which are arranged to face the injection port at the tip of the hot air injection nozzle, are connected by a suction pipe for cooling. The structure was adopted.

[Action]

The surface reforming apparatus having the above-mentioned configuration injects a composite from each of the composite injection nozzles into the hot air injected from the hot air injection nozzle, heats the composite by contact with the hot air, and forms the composite. At least one of the mother particles and the child particles is melted to fix the child particles to the mother particles. Then, the complex is collected in a hood, cooled as it flows through the suction pipe from the hood, and is collected by a collector.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 1, an annular nozzle header 2 is concentrically provided outside the hot air jet nozzle 1.

The nozzle header 2 has an annular passage 3, and an inner diameter portion of the upper surface thereof is a tapered surface 4, and a plurality of complex injection nozzles 5 are provided on the tapered surface 4 at equal intervals.

The composite A is supplied to the annular passage 3 of the nozzle header 2. As the composite supply device, here, an air supply pipe 6 is connected to the nozzle header 2, an outlet of a hopper 7 is connected to the air supply pipe 6, and the ejector action of the compressed air supplied to the air supply pipe 6 is used. The composite A filled in the hopper 7 is fed into the annular passage 3 of the nozzle header 2.

Here, as shown in FIG. 4 (a), the composite A is composed of a mother particle a serving as a core and fine child particles b coated on the surface of the mother particle a. It is attached to the particle a. The mother particles a and the child particles b may be of the same type, or may be of different types such as a polymer material and an inorganic substance.

The composite A supplied to the nozzle header 2 receives the annular passage 3
The composite air jet nozzle 5 to the hot air jet nozzle 1
Is injected into the hot air stream.

In this case, the composite injection nozzle 5 is provided with a required inclination angle α so that the jet flow of the composite injection nozzle 5 does not cross the hot air flow, and the inclination angle α is 30 °.
It is preferably about -40 °.

Further, in order to avoid a temperature rise, it is preferable that the composite injection nozzle 5 be provided with a space between the injection port at the tip and the hot air so as not to directly contact the hot air flow, but if the space is too large, Since the composite A cannot be effectively supplied into the hot air flow, the injection port of the composite injection nozzle 5 needs to be provided with a required space from the hot air flow.

However, since the temperature of the injection port rises to some extent due to the temperature rise around the hot air stream, the temperature rise causes the complex A adhering to the periphery of the injection port to melt, and the complex A adheres to the complex A to form a complex. The fluidity of A may deteriorate, and the melt may drip from the injection port.

Therefore, in order to prevent the composite A from adhering to the injection port and to improve cutting when the molten material drips, a tapered surface 8 is formed at the injection port of the composite injection nozzle 5 as shown in FIG. It is thin and thick.

The temperature of the hot air jetted from the hot air jet nozzle 1 is appropriately determined according to the materials of the mother particles a and the child particles b forming the composite A, and at least one of the surface layer portion of the mother particles a and the child particles b is The temperature should be such that it melts instantly. It is preferable that the diameter of the hot air jetting nozzle 1 can be adjusted so that the temperature can be adjusted.

As described above, by injecting the composite A into the hot air flow, the hot air flow collides with the composite A, so that the composite A is effectively dispersed. Further, since the complex jet nozzles 5 for jetting the complex A are provided at equal intervals around the hot air jet nozzle 1, the hot air flow is disturbed by the jet of the complex A jetted from the complex jet nozzle 5. Instead, the composite A can be uniformly and effectively contacted with the hot air.

By the contact, the composite A is heated and the mother particles a and the child particles b are integrated. In this case, when the softening temperature of the mother particles a is lower than the softening temperature of the child particles b, as shown in FIG. 4B, the surface layer portion of the mother particles a is melted and spherical, and the child particles b are formed on the surface thereof. In the opposite case, the child particles b are melted to form a film on the surface of the mother particles a.

The heat-treated composite A ′ is collected in the hood 9 facing the hot air jet nozzle 1. The hood 9 and a collector 10 such as a cyclone are connected by a suction pipe 11, and a damper 12 for taking in outside air is connected to the end of the suction pipe.

Further, a dust collector 13 having a suction blower is connected to the exhaust port of the collector 10, and suction force is applied to the suction pipe 11 by the operation of the suction blower.

Therefore, the composite pair A ′ collected in the hood 9 flows in the suction pipe 11 and is collected in the collector 10. In this case, since the outside air is taken into the suction pipe 11 from the damper 12, the complex A ′ is cooled and smoothly flows into the collector 10 without being adhered or fixed to the inner surface of the suction pipe 11.

A cooling jacket 14 is provided outside the suction pipe 11, and cold water is supplied to the cooling jacket 14 to suck the suction pipe 11.
By cooling 11 the composite A ′ can be cooled more effectively.

[Effect of device]

As described above, in the present invention, a plurality of composite jet nozzles are provided at equal intervals around the hot air jet nozzle, and the composite jets are jetted into the hot air from each of the composite jet nozzles. It is possible to prevent the hot air from being disturbed by the jet flow. Therefore, the composite injected into the hot air can be effectively dispersed in the hot air by collision with the hot air, and the composite can be extremely effectively
Moreover, the entire outer circumference can be uniformly heat-treated.

In addition, since the entire outer periphery of the composite can be uniformly heat-treated, the mother particles and the child particles can be reliably fixed, and the melted portion due to heating is rounded with corners, resulting in less unevenness. A rounded and uniform product can be obtained.

Furthermore, since the composite that has been encapsulated or spheroidized by heating is collected by the hood and introduced into the suction pipe that sucks the outside air, the composite can be cooled during transportation. Therefore, the complex does not adhere to the inner surface of the suction pipe or the inner surface of the collector, and as a result, continuous operation is possible.
Nearly 100% can be recovered as a product, and since the heat treatment section and collector are open to the atmosphere, there is no danger of dust explosion and it is extremely safe.

In addition, since there is no movable part such as a rotating body and the structure of the device is simple, maintenance is easy.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of a surface reforming apparatus according to the present invention, FIG. 2 is a plan view of a nozzle head portion of the same, FIG. 3 is a sectional view of the nozzle of the same, and FIG. (A) is a cross-sectional view of the composite, FIG. 4 (b) is a cross-sectional view showing a state after the heat treatment of the composite, and FIG. 5 is a schematic view of a conventional surface reforming apparatus. 1 ... Hot air jet nozzle, 5 ... Composite jet nozzle, 9 ...
… Hood, 10 …… collector, 11 …… suction pipe.

Claims (1)

[Scope of utility model registration request] 1. A plurality of composite jet nozzles for jetting, around a hot air jet nozzle, a composite in which fine mother particles are coated on the surface of mother particles serving as nuclei toward the hot air jetted from the nozzles. A surface reforming device for powder, wherein a complex collection hood, which is provided at equal intervals and is disposed so as to face the jet port at the tip of the hot air jet nozzle, and a collector for the complex are connected by a suction pipe for cooling.