JPH07289876A - Granulating and drying method of powder material - Google Patents

Abstract

PURPOSE:To prevent blocking and to improve the production yield of the objective granules by allowing the granulated product to pass through a screen or the like having a large aperture than the objective granule when the granulated product from a granulating machine is sent to a drying machine. CONSTITUTION:In a wet granulating method by adding water and other material usually used such as a binder to a powder material and granulating the mixture, the granulated material is made to pass through a metal mesh, screen or slit having a large aperture 2-80 times as large as the max. particle size of the objective granule before the material is sent to a drying machine. Thereby, production of a large aggregate due to sticking of granules can be prevented and the production yield of the objective granules is largely improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wet granulation / drying method for powders, and more particularly to a method for preventing a granulated product from blocking and obtaining a desired granulated dried product in a high yield. Is.

[0002]

2. Description of the Related Art Conventionally, when a wet-granulated product is dried, a method of directly introducing the wet-granulated product into a dryer has been used. However, in this method, the granulated products adhere to each other to form blocks, or only 20 to 40% of the target granulated dried product adhered to the inner wall of the dryer can be obtained, and various conditions are devised. However, the maximum yield was limited to 60%.

[0003]

An object of the present invention is to prevent the granulated product from blocking when drying the wet granulated product of the powder and to obtain the target granulated dried product in a high yield.

[0004]

Means for Solving the Problems In the wet granulation, when the granules are put into a dryer, the granules adhere to each other to form a large lump of 3 to 100 mm in the conventional method (blocking). Only 30-40% was obtained. Therefore, the inventors conducted various studies on how to obtain the target granulated product in high yield.

As a result, when the granulated product is put into the dryer from the granulator, blocking is prevented by introducing the granulated product into the dryer through a screen having an opening larger than that of the target granulated product. The present invention has been completed based on the finding that the above can be remarkably improved.

The wet granulation method according to the present invention may be extrusion granulation, stirring granulation rolling granulation, or other wet granulation method in which water or other commonly used binder is added to the powder for granulation. All are applicable.

The particle size of the granulated product is not particularly limited, and the opening diameter of the nozzle or screen of the granulator used may be set according to the particle size of the target granulated dried product.

The above granulated product is then put into a dryer through a wire net, a screen or a slit having an opening larger than that of the granulated product.

The size of the opening needs to be larger than that of the granulated product, but if it is too large, the desired effect of the present invention will not be obtained. The opening may be up to about 40 times.

Even in the case of a wet granulated product, the particle size of the granulated product is not uniform, and the particle size distribution varies depending on the type of raw material powder and the granulation conditions. Therefore, it is usually necessary to use a wire mesh, screen, slit or the like having an opening larger than the particle size of the largest segment in the particle size distribution.

Specifically, the opening may be about 2 to 80 times the maximum particle size of the target granulated product, and may be 100 to 150.
In the case of a granulated product of 0 μm, the granulated product before drying should have an opening of 2 to 20 m.
It suffices to pass a wire mesh, a screen, a slit, etc. of about m.

For example, as a method of obtaining a high yield after drying a granulated product of 297 to 1,410 μm, the granulated product before drying is passed through a wire net, a screen, a slit or the like having an opening of 2.8 to 15 mm, preferably 4 to 9 mm. By putting it in the dryer, the yield of the desired product of 30-40% up to that time was 70-8.
It can be improved by 5%.

By using an opening through which the larger particle size does not pass in the particle size distribution, an undesired large particle size classification is removed in advance, and this classification is collected and recycled without being dried. Is also possible.

The shape of the opening is not particularly limited to a square, a rectangle, a circle, an ellipse and the like.

The granulated product that has passed through the wire mesh, screen, slits and the like is then dried, but the drying method is not particularly limited, and sieving and the like after drying is appropriately performed if necessary.

[0016]

【Example】

Example 1 Fish powder 15% (weight%, the same below), salt 30%, umami seasoning 25%, sugar 20%, amino acid 10% natural seasoning with a binder in the range of particle size 210-1,190. Stir-granulated so that When this granulated product was directly put into a fluidized-bed dryer, only about 30-40% of the granulated dried product having a particle size of 210-1,190 μm was obtained, but this granulated product was wire mesh or slit with an opening of 4-9 mm. Then, the target granulated dried product can be obtained with a high yield of 70 to 90% by passing the mixture through the sol.

Example 2 15% vegetable extract, 10% meat extract, 20% amino acid,
A 25% sugar and 30% salt natural seasoning was tumbled and granulated with a binder. When this granulated product is directly put into a fluidized dryer, the target granulated product having a particle size of 0.3 to 1.5 mm is 30 to 30 mm.
Although only 40% was obtained, the granulated product was passed through a wire mesh or slit having an opening of 5 to 10 mm and put into a dryer to obtain a target granulated dried product with a high yield of 70 to 85%. I was able to.

Example 3 In the granulation of a food material of calcium 30%, salt 20%, amino acid 10%, pregelatinized rice 40%, an extruded granule of 0.5 to 2 mm was extruded from a 2 mmφ screen to granulate. When the product was put into the drier as it was, only a yield of 60 to 80% was obtained, but by putting the granulated product into the drier through a wire net of 5 to 15 mm, the yield was 90 to 95%.
I was able to improve.

[0019]

According to the method of the present invention, in wet granulation,
The target granulated dried product can be obtained in high yield.

Claims (2)

[Claims] 1. In wet granulation of powder, when the granulated product is introduced into the dryer from the granulator, it is introduced through a wire mesh, a screen or a slit having a larger opening than the target granulated product. Granulation drying method. 2. Two to 80 times the maximum particle size of the target granulated product
The method for granulating and drying according to claim 1, wherein a wire net, a screen, or a slit having a double opening is used.