JPH0354889Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention is a dryer equipped with a dryer attached to a hopper provided on the upper part of an extrusion molding machine or an injection molding machine for inputting and supplying synthetic resin raw materials. Regarding Hopper.

<Prior Art> If a synthetic resin raw material for molding contains moisture, it will have a negative effect on the shape, precision, light selection, etc. of the molded product, so the raw material must be sufficiently dried. For this purpose, a hopper dryer for drying raw materials as shown in FIG. 3 has conventionally been used.

That is, the synthetic resin raw material is supplied from the upper part of the hopper main body A through the input port C in the loader, but at this time, the air blown from the blower is heated by the heater and becomes hot air, which flows into the hopper. It is supplied into the main body and exhausted from the exhaust port,
The raw material is heated.

However, since the heater hole is located outside the hopper body, it takes up a lot of space, there is heat loss from the heater hole to the raw material, and the structure is complicated.

<Problems to be solved by the invention> In view of the above circumstances, the present invention aims to provide a hopper with a dryer that takes up less space, has less heat loss, and has a simple structure. .

<Means for Solving the Problems> The hopper with a dryer of the present invention solves the above problems by attaching a cylindrical drying device with a built-in electric heat source directly inside the hopper.

<Operation> However, the raw material comes into direct contact with the surface of the cylindrical drying device. Therefore, the outer surface of the device was filled with a heat insulating material to keep the surface at a low temperature that did not reach the melting temperature of the raw material, and to work on the raw material without causing any problems.

<Embodiments> Hereinafter, embodiments of the present invention will be described with reference to the attached drawings.

Reference numeral 1 in FIG. 1 is a hopper, and the raw material outlet 2 at the bottom is attached to the molding machine. Although not shown, a synthetic resin raw material is automatically supplied into the hopper 1 by a loader or the like.

Inside the hopper 1, a cylindrical drying device 3 is attached vertically from the top to the center. Cylindrical drying device 3
has a built-in electric heat source 4 consisting of a Shih Tzu tube heater, and the outer surface of the cylindrical drying device (3) is filled with a heat insulating material 5 to a required thickness. Therefore, the surface of the cylindrical drying device 3 is maintained at a low temperature within the melting temperature of the raw material, so there is no risk of harming the raw material.

The upper part of the cylindrical drying device 3 is directly equipped with an air blower 6 consisting of a blower, and the lower part thereof is provided with an outlet 8 to which a mesh-shaped punching plate 7 is attached. In addition, the temperature was measured using the thermometer 9, and the electric heat source 4 was turned on using the temperature controller of the T/C.
The hot air is maintained at the desired temperature by turning it off.
The raw material is blown into the hopper 1, dried directly in the hopper 1, and then exhausted from the exhaust port 10.

FIG. 2 is an example of a hopper with a dryer showing another embodiment of the present invention. 11 is hopper, 13
is a cylindrical drying device, 4 is an electric heat source, 18 is an air outlet, etc., and the blower B is installed within the dehumidifying unit D or separately, and the dehumidified dry air blown from the blower B is The air is sent into the cylindrical drying device through the air outlet 16.

This is because engineering plastics such as polyethylene terephthalate resin and nylon resin are extremely sensitive to moisture, and unless dehumidified air is supplied in advance, the humidity cannot be lowered to the desired relative humidity simply by increasing the temperature. Since a dehumidifying unit is required, and the blower is installed inside the dehumidifying unit or outside the hopper, the air blowing port 16 is used.

<Effects of the invention> Because the hopper with dryer of the present invention has the above-mentioned configuration, it does not take up much space, making it possible to effectively utilize the space in the narrow molding chamber, and the short passage from the heat source to the air outlet improves thermal efficiency. The object of the present invention is to provide a hopper with a dryer that is useful and practical and has advantages such as a simple structure and fewer failures.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing one embodiment of the present invention, Fig. 2 is a longitudinal sectional view showing another embodiment of the invention, and Fig. 3 is a longitudinal sectional view showing another embodiment of the invention.
The figure is a schematic front view showing a conventional example. In the figure: 1, 11... Hopper, 3, 13... Cylindrical drying device, 4, 14... Electric heat source, 6... Air blower, 8, 18... Air outlet, 16... Air outlet.

Claims (1)

[Scope of utility model registration request] A cylindrical drying device with a built-in electric heat source is attached to the hopper.The top of the cylindrical drying device is equipped with a blower or an air outlet, and an air outlet is provided near the bottom, so that raw materials can be directly supplied inside the hopper. A hopper with a dryer that can be dried.