JPH0357838B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a method of coating solid particles with a material that is highly viscous or solid at room temperature, and particularly relates to a method of coating solid particles on the surface thereof so as to embed the solid particles. This relates to a method of applying the coating to the surface.

[Prior art]

BACKGROUND ART Conventionally, a granulator has been proposed, which forms a melted material into a film using a granulator equipped with a rotating disk in a cylindrical housing, and coats solid particles with the film. This rotating disk has cylindrical walls arranged at predetermined intervals to form a gap, and at the same time blows air in order to disturb the solid material introduced onto the top surface of the disk. The particles were sprayed with molten material using a nozzle. This method involves a device for coating solid particles and a method for coating solid particles using the device, which processes only one location within the housing, and the processing location is undesirably agglomerated due to excessive steam.

Furthermore, a device that generates moisture evenly on solid particles is a Swedish patent (SE-B-7903053-2).
It is stated in the official gazette. The manufacturing method and the equipment used in the manufacturing method are described as continuously mixing liquid and powder in order to mix evenly generated vapor. The liquid and powder used in this device are fed to the recesses of the rotary disk and to the compartment spaces of the rotary disk into which the powder is introduced, via separate conduit feeding devices. As a result, the liquid and powder are discharged toward the circumferential edge of the disk. The liquid is transferred to the lower side of the disk and is transferred to the upper side of the disk from the recessed part defined by the gap, and a layer of vapor is generated from the gap at the outlet of the disk. This vapor layer is absorbed by the powder moving toward the circumferential edge of the disc from the partitioned space in which the powder is fed, and the powder and vapor mix uniformly to form particles.

[Problem that the invention seeks to solve]

(Purpose) The present invention provides the simplest and most rational way to coat solid particles with a liquid material that is highly viscous or solid at room temperature and becomes weakly viscous when the temperature rises. The purpose is to

The diameter of the one obtained by the method of the present invention is 0.5
~1.5mm diameter, has moisture absorption resistance, prevents taste deterioration, has heat resistance, prevents melting in certain Hp regions to melt in other Hp regions, and melts. In the Hp region, drug-like formulations dissolve in the intestines with high Hp, so they do not dissolve in the gastric juice, which has an acidic pH, and also have low pH that can be used by the gastrointestinal tissues that feed back. PH of the food that has been eaten back
It is coated with a material that is unaffected by water so that food can pass through.

(Structure and operation) The coating method according to the present invention includes a molten material that has high viscosity or is solid at room temperature to room temperature;
A solid material to be coated is guided and transferred through a separate supply pipe into a concave portion of a rotary disk, and a cap is provided on the disk so that the solid material is moved by a force in the circumferential direction of the disk. The molten material is forced to move from the recess through the gap of the disk, and the solid material is pushed from the top surface of the disk toward its periphery, whereby the molten material is moved into the recess of the disk. The molten material passes through the gap and then presses towards the top of the disc, where the molten material eventually scatters and forms a mist of small droplets. The atomized droplets then come into contact with solid particulate material scattered toward the circumferential edge of the disk. The surface of the solid particles is then completely coated without interruption with a highly viscous material, which solidifies when cooled to room temperature.

As used herein, "a molten material that is highly viscous and solid at room temperature" is defined as a temperature of 40°C or higher, preferably 50°C or higher, which is the practical limit for keeping a device with a material supply pipe in a heated state. A material that is liquid at temperatures up to 150°C. Therefore, the highly viscous material maintains a substantially solid shape in the same temperature range as room temperature. However, it is physically and chemically defined as a liquid. A solid material means a material whose structure is solid. This solid material has a well-defined melting point, at least a narrow region of thermal melting. On the other hand, highly viscous materials do not have a clear melting point. However, as the temperature increases, the liquid becomes less viscous. Therefore,
Both materials may be referred to as melts. Suitable materials for the melt include wax, fatty acids, and glycerin fatty acid esters that have two or three fatty acid groups bonded to them.
It is an individual thing. This melt has a melting point of 40° to 50°
℃ or higher, solidification occurs when coating with solid materials at least 40 ℃, preferably below 50 ℃.

As used herein, the term "particulate solid material" refers to such solid materials in the form of particles with a particle size of up to about 1.5 mm.

According to the method of the present invention, the solid material to be coated can be used in solid form without melting the solid material to be applied, which is hygienic and safe.

〔Example〕

The apparatus used in the present invention will be explained based on the accompanying drawings. Reference number 1 is a casing, and a lid 2 is attached to the casing 1. An upper disk 3 and a lower disk 4 are disposed on a shaft 5 which is rotatable via a bearing 6 provided in the housing 1. The lower surface of the disk 3 and the disk 4 have a gentle inverted conical shape, and the inner portion of the lower surface of the disk 3 is formed with a plurality of radial recesses 7, and the outer annular surface and the outer circumferential surface of the disk 3 are formed. Annular gaps 8 and 9 are formed between the upper surface of the lower disk 4 and the upper surface of the lower disk 4. The upper surface of the upper disk 3 is cut to provide a plurality of blades 10 radially. This blade 10 may be fixedly installed by forming the disk 3 into a concave shape in advance. Further, the disc 3 and the blade 10 may be integrally cast. Between the blades 10 there are compartment spaces 13 for receiving the solid particles to be coated. On the other hand, a plurality of blades 11 are formed approximately radially in order to divide the recessed portion 7 into a plurality of pieces. This blade 11 is used to receive the coating melt. An annular protrusion 14 is provided on the lower disk 4 so as to form the gap 9 and have an opening. Annular protrusion 1 of the disk 4
4, a blade 15 is provided at the periphery extending outwardly from the blade 15 for discharging the finished product via a dissipating section 16 and an outlet 17. A shaft tube 22 is provided in the center of the lid 2.
A cylindrical passage 19 made of a larger diameter cylindrical body is formed, and the solid particles dropped from this cylindrical passage 19 are arranged in the divided space 13 near the center of the disk 3. The solid particles are fed into the cylindrical passage 19 by a transfer means 21, such as a screw conveyor. A shaft tube part 22 is formed on the upper part of the shaft 5,
Liquid material is fed to the recessed portion 7 via this shaft tube portion 22 .

[Effect]

The operation of the apparatus configured as described above will be explained. Both discs 3 and 4 rotate at 1000 to 5000 per minute around a shaft 5 inside a lid 2 covering a housing 1.
The preferred speed of the circular edge of the upper disk 3 of 300 mm in diameter is 1,500 to 5,000 m per minute, and the lower disk 4 is sufficiently coated by biting into the speed lump particles and covering the entire surface. Rotate as if The molten material for coating is thereby supplied via the shaft tube 22 to the recess 7 of the device. This melted material includes, for example,
Among waxes, fatty acids, and glycerin fatty acid esters, those having two or three bonded fatty acid groups can be used. The melting point of these molten materials is between 40°C and 50°C or higher. The material transferred to the shaft tube section 22 is supplied from a heating device to keep it in a molten state at all times. By means of the circumferential force of the disc and the blades 11, the molten material is moved outwardly from the gap 8 through the gap 9. The molten material always forms a thin liquid film in the outward direction. When this film-like molten material escapes from the gap 9, it is broken up into fine droplets by the annular protrusion 14. The droplets form a fine mist curtain that is visible under a microscope. At the same time compartment space 13
Particulate material is ejected from the input channel 19 by means of a feeding device 21 and ejected from the compartment space 13 by means of the extrusion force and the blades 10 . At the same time, the annular protrusion 14 makes contact with the atomized curtain generated from the melt and covers the particle material that has passed through the melt, so that the melt coats the surface of the particle material. It is released towards the direction. The product is then discharged out of the device via the diffuser 16 and the outlet 17. The products released to the outside are transported to a higher location, where they are packaged in predetermined quantities.

〔effect〕

The method of the present invention allows particles to be simply embedded into uniform, small-sized particles, and can be manufactured without using any dissolving power in the coating material when loading the drug.

Also, with the method of the present invention, the powder material can be easily processed and coated, thereby making it possible to exhibit its blending and tablet properties. Additionally, easily meltable powders can be granulated and coated when mixed and dispersed with a liquid.

In the method of the present invention, even if heat-reactive materials are used, they will not undergo substantial decomposition or putrefaction even if heat is applied during the granulation and release steps.

The method of the invention can also be used with materials that are sensitive to heat, since the time that the raw material remains in the same position during the processing operation is extremely short. The time interval during which the coating material melts and forms a mist-like curtain is only 1 second. for example
Even when NaHCO ₃ is used, the hydrocarbon does not undergo any decomposition and can be used as a melting material for coating.

According to the method of the present invention, even particles made of insecticides or fungicides can be coated very easily.

With the method of the invention many products other than those mentioned above can be produced, for example rice grains can be instantaneously coated, and it is also possible to coat thiokolate.

In the method of the invention, before the solid particles and the molten material come into contact with each other during the processing process, the two materials form a contact surface suitable for coating. When the particles are melted and the material itself inspected, the coating is of extremely high quality.

Furthermore, as described in the present apparatus above, the molten material is introduced from the shaft tube at the center of the apparatus, and the processing of the material is extremely rational and has the effect of producing good quality products.

The blade 10 shown in the accompanying drawings does not extend to the annular ridge 14 but is spaced apart in order to achieve a completely homogeneous coating.

On the other hand, in the case of the blade 10, the blade 10 extends to the vicinity of the annular protrusion 14, and the molten material is coated on the particles by spraying them one after another.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of the apparatus used in the present invention, FIG. 2 is a sectional view taken along the - line in FIG. 1, and FIG. 3 is an enlarged longitudinal sectional view of the main part of FIG. 1. 1... Housing, 2... Lid, 3, 4... Disc, 5...
...shaft, 7... recess, 8, 9... gap, 10, 1
1, 15...Blade, 17...Blade.

Claims (1)

[Scope of Claims] 1 A raw material consisting of a molten material that is highly viscous or solid at room temperature and a particulate solid material coated with the molten material, wherein both raw materials are transported through separate conduits 1
9, 22 into a recess 7 in a rotating disk 34 for mixing and one or more compartment spaces for solid material in said disks 3, 4, then both raw materials are introduced into said The molten material is scattered by the pressing force in the direction of the circumferential edges of both disks 3 and 4, whereby the molten material flows from the concave portion 7 toward the upper side of both disks 3 and 4 through the gap between both disks 3 and 4. pressed,
The molten material is then formed into a mist of fine droplets, and the atomized molten material interacts with the particulate solid material flying outwards of the disk, and then
A method for coating solid particles, characterized in that the surface of the solid material is coated with a highly viscous molten material without any gaps and is adhered to the surface, and then the molten material cools down to room temperature and solidifies. 2. The rotating disks 3 and 4 for mixing the materials are characterized in that they process a large amount of the materials to be processed per unit time, thereby embedding the particulate solid materials and solidifying them into a lump. A method for coating solid particles according to claim 1. 3. The rotating disks 3 and 4 for mixing the materials are processed in accordance with a small amount of the materials to be processed per unit time,
A method of coating solid particles according to claim 1, characterized in that each individual particle of the particulate solid material is thereby coated to form an individual particle.