JPH0724369A - Spraying device - Google Patents

Abstract

PURPOSE:To make a spraying device portable while molten wax and air for spraying the wax being kept at a constant temperature by uniform heating by connecting a heating tank, a gear pump, and an air heating and pressurizing apparatus to a spray gun with heated hoses. CONSTITUTION:A spraying device is to coat or pelletize solid particles of medicine and others with molten wax without using a solvent. A heating tank 9 keeps a molten wax at a constant temperature; a gear pump 10 feeds by pressure the molten wax to a spray gun 14; and an air heating and pressurizing apparatus 11 atomizes the wax. The heating tank 9, the gear pump 10, and the air heating and pressurizing apparatus 11 are connected to the spray gun 14 with two or more hoses 12, 13. The heating tank 9 consisting of a liquid tank and a heating medium jacket is equipped with a heating medium heating apparatus. The temperatures of equipment 9-11 and hoses 12, 13 are controlled by a control panel 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spray device for coating or granulating solid particles such as medicines and foods with wax which is heated and melted without using a solvent.

[0002]

2. Description of the Related Art Conventionally, a spray method for dissolving waxes in an organic solvent and coating or granulating solid particles such as medicines and foods is well known. On the other hand, in recent years, attempts have been made to directly heat and melt waxes without using an organic solvent to coat solid particles (PHARMACEUTICAL RE).
SEARCH7. NO11. (1990)). As shown in FIG. 1, the apparatus used in such a method is a molten coating tank 1 for heating and holding waxes, a hot plate 2 as a heat source for the waxes, and a roller for feeding the heated and melted waxes to a spray gun 3. Pump 4 and its piping 5,
An oil bath 6 for heating the air for spraying the liquid-melted waxes under heating and melting, a pipe 7 for pumping the heated air, a thermometer 8 for measuring the temperature of the pumped air, and a spray gun 3. It consists of

[0003]

However, in such an apparatus, the hot plate 2 is used as a heat source for heating and melting waxes, and this hot plate has a small heat transfer area to the molten coating material tank 1. The heat dissipation area of the molten coating material tank 1 is also large. Therefore, when the heat efficiency becomes poor and the amount of waxes charged increases, it is impossible to efficiently heat and melt the waxes at a uniform temperature and hold the heat. Further, there is a safety problem because the waxes that have been heated and melted are not equipped with a temperature control facility even though the waxes that have a risk of ignition are handled. In addition, since the roller pump 4 for feeding the waxes heated and melted by the hot plate 2 to the spray gun 3 and the pipe 5 therefor are not provided with the temperature control equipment for the waxes to feed the liquids, the temperature during the liquid feeding is the roller. It becomes non-uniform in the pump or in each part of the pipe, and especially when the temperature of the liquid is below the melting point of the waxes, the wax solidifies in the roller pump or the pipe and the liquid cannot be delivered. I will end up. Further, this roller pump generally uses a tube made of synthetic resin or the like, and there is a problem in heating above the melting point of waxes. Therefore, not only the liquid feeding distance of the wax melted by heating cannot be lengthened, but also the kind of waxes that can be used is limited by the melting point, and only the material with a relatively low melting point can be used. was there. Further, in heating the air for spraying the liquid-heated wax under heating and melting, the oil bath 6 is used to heat the air by passing it through the oil, and therefore the oil is coated with the heated air. object,
Alternatively, it may be sprayed on the granulated product, which becomes a problem in terms of product quality.

Further, in the pressure feeding of the heated air by the oil bath 6 and the pipe 7, since the temperature control equipment for automatically controlling the temperature of the air is not provided, the temperature of the air being fed is the temperature of the oil bath 6 and the pipe. It becomes non-uniform at each position of 7, and it is difficult to pressure feed air to the spray gun 3 at a stable temperature. Especially when the temperature of the air is below the melting point of the waxes that have been liquid-fed in the spray gun 3, heating and holding at a temperature above the melting point,
When the waxes that have been liquid-fed are sprayed and coated, the waxes are cooled to a temperature below the melting point, and the waxes are insufficiently melted to form a uniform coating, failing to achieve the intended purpose. Also, if the temperature of the air is too high with respect to the melting point of the waxes, the spray will melt the waxes already adhered to the coating, or the granules, causing not only aggregate formation but also the coating, Alternatively, it may cause burns of the granulated material. As described above, the conventional device has many problems in terms of product quality and safety and health.

[0005]

The present inventors have completed the present invention as a result of intensive studies to solve the above problems. That is, the present invention relates to a spray device for coating or granulating solid particles with heat-melted waxes, (1) a heating tank for heating and holding the heat-melted waxes, (2) the waxes for a spray gun. A spray pump characterized in that a heated and held gear pump for liquid delivery and (3) a heated and pressurized air device for spraying the waxes are connected to a spray gun by respective hoses that are heated and held.

Next, the present invention will be described in detail. In FIG. 2, a heating tank 9 for heating and melting waxes and heating and holding the same, a gear pump 10 for heating and feeding the waxes to a spray gun 14, and a hose 12 for heating and holding a heating and pneumatic device 11 respectively. , 13 connected to the spray gun 14. The heating tank for heating and melting the waxes of the present invention is a liquid tank 1 as shown in FIG.
A heat medium jacket 17 is provided on the outer periphery of 6, and the heat medium jacket is heated by an external heat medium heating device 18, whereby the waxes can be heated and melted and heated and held at 50 to 200 ° C. Further, since an external heating medium heating device is used, it is possible to prevent the occurrence of fire such as empty heating of the heating tank.

Further, a stirrer 19 driven by an air motor or the like may be provided inside the liquid tank, and the stirrer can heat and melt the waxes uniformly at a stable temperature and hold the heat. Especially, it is suitable when a large amount of waxes are charged in actual production. In FIG. 2, the gear pump 10 and the hose 12 are equipped with external heating devices on their outer circumferences and can be heated and maintained at 50 to 200 ° C. Therefore, the waxes heated and melted in the heating tank 9 can be liquid-fed to the spray gun 14 while being heated and held at a temperature of 50 to 200 ° C.

The heating / compressing air device 11 heats / heats the heated air uniformly at a stable temperature and controls the heating / compressing air in order to safely feed the compressed air to the spray gun 14.
1 is equipped with a heating device using an electric coil or the like, and the heating device causes a gas pressure of 0.05 to 10 kg / cm ² ,
Gas at a flow rate of 10 to 500 NL / min in the range of 50 to 500 ° C
It is installed so that it can be heated and held. Heating / pneumatic device 11
The spray gun 14 is connected to the spray gun 14 by a hose 13 provided with a heater on the outer circumference, and the gas heated by the heating / pneumatic device 11 is pressure-fed to the spray gun 14 while being heated and held at 50 to 500 ° C. Therefore, the heated air for spraying waxes can be pressure-fed to the spray gun while uniformly maintaining and controlling the heated air at a stable temperature. The waxes thus heated and melted are sprayed from the spray gun together with the heated air.

As shown in FIG. 2, a heating tank 9, a gear pump 10, a heating and pneumatic device 11, and hoses 12 and 13 are provided.
The temperature can be controlled by a control panel 15 installed outside the spray device through an appropriately installed sensor. As a result, while being heated and held at a temperature above the melting point, the waxes that have been liquid-fed are sprayed and solidified at the temperature below the melting point at the stage of coating, or the temperature of the heated air is too high, and the coated product Alternatively, it is possible to prevent a phenomenon such as melting of waxes already attached to the granulated product, and always spray waxes at a stable temperature.
Can be coated. As a result, not only the safety of the spray device but also device maintenance or automation can be supported. The heat source of the external heating device is not particularly limited as long as it can maintain the temperature for carrying out the present invention, such as heating and melting waxes, heating of a pump or heating of air, but more controllability is preferable. A good electric heater is used.

The spray gun used in the present invention may be any spray gun capable of spraying waxes under heating and melting. For example, a CN nozzle (registered trademark) or the like that does not cause the wax to be clogged at the nozzle tip, that is, a two-flow pair type nozzle that does not have a needle valve and the like can be mentioned. It is preferable that the spray device of the present invention is entirely covered with a heat insulating material. The equipment used at the same time as the spray device of the present invention is not particularly limited as long as it is an equipment that can be generally used for granulation or coating, for example, a fluidized bed granulation dryer, a composite type fluidized bed granulation coating device,
A centrifugal fluidized granulator, sugar-coated bread, high-speed stirring granulator, etc. are appropriately used. As for the spray device of the present invention, a plurality of the present devices may be installed according to the manufacturing scale.

[0011]

EFFECTS OF THE INVENTION According to the present invention, a heat-melted wax can be heated and held uniformly at a stable temperature, and liquid can be fed while being controlled. On the other hand, a heat-melted wax for spraying can be heated. Since air can be heated and held uniformly at a stable temperature and pressure-fed while being controlled, it is possible to spray and coat at a stable temperature. Therefore, the quality and production efficiency of the coated or granulated product are improved, and the maintenance and safety of the spray device are also increased, so that a stable product can be provided on a production scale of actual production.

[0012]

[Brief description of drawings]

FIG. 1 shows a conventional apparatus for directly heating and melting waxes for coating or granulation.

FIG. 2 shows a schematic configuration diagram of a spray device of the present invention.

FIG. 3 is an enlarged vertical cross-sectional view of a heating tank of the device of the present invention and an external heating medium heating device.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuo Uchiyama 1-3-45 Kuragakiuchi, Ibaraki-shi, Osaka Sumitomo Pharmaceutical Co., Ltd.

Claims (2)

[Claims] 1. A spray device for coating or granulating solid particles with waxes heated and melted, comprising: (1)
A heating tank that heats and holds wax that has been heated and melted,
(2) A gear pump that is heated and held to feed the waxes to the spray gun and (3) a heated and pressurized air device that sprays the waxes are connected to the spray gun by hoses that are heated and held. A spray device characterized in that 2. The spray apparatus according to claim 1, wherein the heating tank comprises a liquid tank and a heating medium jacket.