Adjustable fluidized bed coating process and adjustable fluidized bed coating device

Abstract

The invention discloses an adjustable fluidized bed coating process and an adjustable fluidized bed coating device, relating to the technical field of large-batch uniform coating production process. The adjustable fluidized bed coating device comprises a shell, an air inlet, an air inlet chamber, an air distribution screen plate, a fluidization chamber, a separation chamber, an air outlet and spray gun. According to the fluidized bed coating process, a coating agent wraps core pill particles, the height of a pulverization area of the spray gun connected with the coating agent is increased along with the increasing of fluidization material level. The device is suitable for industrial large-batch production, and has the advantages of good product quality, high yield, low product cost, stable operation and safety, the handling capacity of each batch is 20 tons / batch.

Description

technical field [0001] The invention relates to the technical field of large batch uniform coating production technology. Background technique [0002] The coating method is used to coat various active ingredients, which has involved various effects such as anti-oxidation coating, moisture-proof coating, stomach-soluble coating, enteric-coating coating, and coloring coating, among which the coating weight has increased by 30 % or more, or when the processing volume of each batch is greater than 300 kg, adverse effects will occur: [0003] 1. The coating is difficult to be uniform, and the thickness of the coating is also difficult to achieve the coating effect in uneven thin and weak places. [0004] 2. The existing coating method cannot be mass-produced, and the quality is difficult to guarantee. At present, there are no fluidized bed coating machines on the market with a single batch processing capacity greater than 300 kg, which will be affected during large-scale produ...

AI Technical Summary

Problems solved by technology

[0003] 1. The coating is difficult to be uniform, and the thickness of the coating is also difficult to achieve the coating effect in the uneven thin and weak places

[0004] 2. The existing coating method cannot be mass-produced, and the quality is difficult to guarantee

At present, there are no fluidized bed coating machines on the market with a single batch processing capacity greater than 300 kg, which will be affected during large-scale production. 300 kg, as the coating process proceeds, the volume of the incoming nuclear pellets will continue to increase until it is about 2 times. The fixed spray gun, the top spray type, and the bottom spray type spray gun all lead to difficult coating quality. Qualified. It is found through applied research that when the processing capacity is greater than 20 kg per batch and the coating weight increase reaches more than 100%, the coating quality will be unqualified;

[0005] For example: in a normal fluidized bed, during fluidization, large particles will tend to concentrate at the bottom, small particles will tend to concentrate at the top, and the spray gun with a fixed position, when the fluidization material level increases, for the increased fluidization position , the spray gun is easy to spray; the spray gun in the form of top spray, when the height of the fluidized material level changes greatly, the height of the spray gun mouth from the upper surface of the fluidized layer will change, resulting in changes in the coating quality, and more small particles are packed; common The fluidized shape of the fountain and the spray gun in the form of bottom spray, when the height of the fluidized material level changes greatly, the fluidized state of the fountain changes, the adhesion rate increases and other reasons lead to unqualified quality

[0006] 3. For example, when the common production capacity of 20,000 tons is produced per year, more than 200 sets of existing coating equipment need to be used, which is basically economically unfeasible

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