JPH07100362A - Fluidized bed granulator - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a fluidized bed granulating apparatus capable of uniformizing the quality of a coated product by making the flow of powder particles in a granulating cylinder uniform and preventing agglomeration of the granulated product. [Structure] The rectifying plate 4 is fixedly arranged in the heating gas supply chamber of the granulation cylinder 6, and an upper supply chamber 5a and a lower supply chamber 5b are formed by partitioning. Further, gas inlets 7a and 7b communicating with the supply chambers 5a and 5b are opened in the granulation cylinder, and a gas supply pipe 8 is connected to these gas inlets in the tangential direction of the granulation cylinder. A gas supply port 9 is opened at a position facing the gas inflow ports 7a and 7b of the straightening vane, and a shutter 10 for adjusting the opening degree of the gas supply port is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for granulating powder and fine particles.

[0002]

2. Description of the Related Art Generally, a mixed granulating apparatus is used for producing powder such as toner for copying machines and fine particles such as chemicals. This mixed granulator includes a fluidized bed granulator and a centrifugal fluidized bed granulator. In the fluidized bed granulator, the powder is mixed and stirred by the centrifugal force generated by the rotary table provided in the granulating cylinder and the heating gas supplied from below the slit grill provided on the outer peripheral side of the rotary table, and the centrifugal flow is performed. In the layer granulator, the powder is mixed and stirred by the heating gas supplied from below the slit grill, and in any granulator,
Granulation is performed by spraying the coating agent on the powder under mixing and stirring.

[0003]

However, in the conventional granulating apparatus, it is difficult to uniformly supply the heating gas from the slit grille, which hinders the uniform mixing and stirring of the powders, and the granulated product is Aggregation (due to non-uniformity of particle flow)
However, there is a problem in that the occurrence of defects occurs and the variation in coating quality becomes large.

The present invention is intended to solve the above problems, and its object is to make the flow of powder particles in a granulation cylinder uniform (stabilize) and to agglomerate the granulated product in the granulation cylinder. It is to provide a fluidized bed granulating apparatus capable of making the quality of a coated product uniform by preventing the above.

[0005]

A fluidized bed granulating apparatus of the present invention is provided with a rotary table and a slit guide in a granulating cylinder, and causes heated gas to flow into a gas supply chamber from a gas inlet of the granulating cylinder. In the granulating apparatus configured to agitate the powder or fine particles by ejecting from below the rotary table through the slit guide into the granulating chamber, a rectifying plate that is uniform with respect to the heating gas and capable of setting an arbitrary air volume, It is characterized in that it is provided in the gas supply chamber.

[0006]

[Operation] The heating gas for granulation is made to flow into the gas supply chamber through the gas inlet of the granulation cylinder and is made highly uniform by the straightening plate,
It is jetted from below the rotary table into the granulation chamber through the slit guide. While the powder is uniformly and stably mixed and stirred by the jetting of the heating gas and the rotation of the rotary table,
Granulation is carried out by spraying the powder with a coating agent.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described more specifically with reference to the embodiments shown in the drawings. Example 1 (Claims 1, 2 and 3) In the granulating apparatus shown in FIGS. 1 and 2, the rotary table 1 and the slit grill 2 provided directly below the rotary table 1 form the bottom of the granulating chamber 3. The current plate 4 is fixedly arranged in the heating gas supply chamber below the slit grill 2 to partition the upper supply chamber 5a and the lower supply chamber 5b. A gas inlet 7a communicating with the upper supply chamber 5a and a gas inlet 7b communicating with the lower supply chamber 5b are opened in the granulation cylinder 6, and a gas supply pipe 8 is connected to these gas inlets. Connect in the tangential direction of the cylinder 6. Baffle plate 4
The gas supply port 9 is opened at a position facing the gas inflow ports 7a and 7b, and a shutter 10 for adjusting the opening degree of the gas supply port 9 is provided. Reference numeral 11 is a motor for rotating the rotary table 1. The opening of the gas supply port 9 can be adjusted within a range of 30 to 100% in order to make the amount of the heated gas jetted from the slit grill 2 uniform in accordance with the change in the flow rate of the heated gas.

In this apparatus, the heating gas G is supplied to the gas supply pipe 8
And, it flows into the upper supply chamber 5a and the lower supply chamber 5b through the gas inlets 7a and 7b. The heating gas in the upper supply chamber 5a is jetted from the slit grill 2 to the granulation chamber 3, and the heating gas in the lower supply chamber 5b passes through the gas supply port 9 whose opening is adjusted,
It spouts from the slit grill 2 to the granulation chamber 3.

Embodiment 2 (Claim 4) In the granulating apparatus shown in FIGS. 3 and 4, a fixed table 21 and a large number of radially adjustable guide claws 22 provided on the outer peripheral portion of the fixed table 21 are used. The straightening vane 23 is fixedly arranged immediately below the slit grill 2 and in the immediate vicinity thereof. The gas supply pipe 8 is connected to the gas inlet of the heating gas supply chamber 5 in the tangential direction of the granulation cylinder 6. The guide claw 22 has a structure similar to that used in a dry toner airflow classifier, and the opening degree (gap) can be arbitrarily set within the range of 1 to 5 mm depending on the flow rate of the heating gas. is there. Such a straightening plate 23
Thereby, the heating gas can be uniformly and stably supplied to the granulation chamber 3 from the slit grill 2.

Embodiment 3 (Claim 5) In the granulating apparatus shown in FIGS. 5 and 6, a fixed table 31 and a large number of rotary blades 32 radially provided at the center of the fixed table and capable of adjusting the number of revolutions are provided. A straightening plate 33 composed of and is fixedly arranged immediately below the slit grill 2 and in the immediate vicinity thereof. A gas supply pipe 9 is connected to the gas inlet of the heating gas supply chamber 5 in the tangential direction of the granulation cylinder 6. The rotary vane 32 arrangement portion has a biaxial structure so that rotation can be controlled separately from the rotary table 1. With such a straightening plate 33, the heating gas can be uniformly and stably supplied from the slit grill 2 to the granulation chamber 3.

Next, a test example based on the above embodiment and
A comparative example will be described. In addition, in these test examples and comparative examples, Spiral coater SP-40 type (centrifugal rolling type) manufactured by Okada Seiko was used, and in Test Examples 1 to 3, main parts were modified corresponding to Examples 1 to 3, respectively. In Comparative Example 1, the test was conducted without modification.

Test Example 1 Using the apparatus of Example 1, the rotation speed of the rotary table 1 was set to 2
00 rpm, the pressure of the heating gas supply chamber 5a, 5b is 200
The coating layer forming liquid was applied to the surface of the ferrite carrier as mmAq to obtain a silicone resin-coated carrier. The target thickness of the coat layer was 1.00, and the layer thickness was measured by a cross-sectional photograph. The results are as follows, and good values were obtained for each item as compared with Comparative Example 1. Adhesion efficiency: 79.4% Coat layer thickness: 0.94 Fluidity: 30.13 Bulk density: 2.50

Test Example 2 The apparatus of Example 2 was used, and the clearance of the guide claw 22 of the current plate 23 was set to 3 mm. The results are as follows,
Good values were obtained for each item as compared with Comparative Example 1. Adhesion efficiency: 82.7% Coat layer thickness: 0.95 Fluidity: 30.58 Bulk density: 2.54

Test Example 3 The apparatus of Example 3 was used. The results are as follows, and good values were obtained for each item as compared with Comparative Example 1. Adhesion efficiency: 82.9% Coat layer thickness: 0.91 Fluidity: 31.07 Bulk density: 2.49

Comparative Example 1 The same apparatus as in Test Example 1 except that the current plate 4 was not used,
The coating layer forming liquid was applied to the surface of the ferrite carrier under the conditions to obtain a silicone resin coated carrier. The results are as follows, and in comparison with Test Examples 1 to 3, all the items are inferior. Adhesion efficiency: 66.4% Coating layer thickness: 0.79 Fluidity: 27.31 Bulk density: 2.24 The results of Test Examples 1 to 3 and Comparative Example 1 are summarized in Table 1. It is as follows.

[0015]

[Table 1]

[0016]

As apparent from the above description, according to the granulating apparatus of the present invention, since the gas supply chamber is provided with the straightening plate which allows the heating gas to be uniformly set and the air volume can be arbitrarily set, The flow of the powder and fine particles in the inside is made uniform, the agglomeration of the granulated product is prevented, and the granulated product can be evenly dried. Therefore, there is an effect that a coated product having a uniform quality can be stably granulated.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a main part of an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a vertical cross-sectional view showing the main parts of another embodiment.

4 is a sectional view taken along line BB of FIG.

FIG. 5 is a vertical sectional view showing a main part of still another embodiment.

6 is a cross-sectional view taken along the line CC of FIG.

[Explanation of symbols]

 1 rotary table 2 slit grill 3 granulation chamber 4,23,33 straightening plate 5 heating gas supply chamber 5a upper supply chamber 5b lower supply chamber 6 granulation cylinders 7a, 7b gas inlet 8 gas supply pipe 9 gas supply port 10 shutter 11 Motor 21, 31 Fixed Table 22 Guide Claw 32 Rotating Blade

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G03G 9/107 9/113 G03G 9/10 352

Claims (5)

[Claims] 1. A granulation cylinder comprising a rotary table and a slit guide, wherein heated gas is introduced into a gas supply chamber from a gas inlet of the granulation cylinder, and the granulation chamber is introduced from below the rotary table through the slit guide. In a granulating apparatus configured to agitate powders and fine particles by being jetted into a fluidized bed, a flow plate characterized in that a rectifying plate that is uniform with respect to the heating gas and that can set an arbitrary air volume is provided in the gas supply chamber. Granulator. 2. The gas supply chamber is vertically moved by the straightening plate.
2. The gas supply chamber is divided, the gas inlet is provided in each of the gas supply chambers, and one gas supply port is provided in the straightening plate at a position facing the gas inlet. Fluidized bed granulator. 3. The fluidized bed granulator according to claim 2, wherein a shutter for adjusting the opening of the gas supply port is provided at the gas supply port of the straightening plate. 4. The flow according to claim 1, wherein the straightening vane comprises a fixed table and a large number of guide claws radially provided on an outer peripheral portion of the fixed table and capable of adjusting the opening degree. Layer granulator. 5. The rectifying plate comprises a fixed table and a large number of rotary blades provided radially at the center of the fixed table so that the number of rotations can be adjusted. Fluidized bed granulator.