JPH03297610A - Air-type cleaner for wall surface of plastic drying vessel - Google Patents

Abstract

PURPOSE:To prevent the adhesion of a powder of a plastic to wall surfaces of a drying vessel and dry the plastic uniformly, by discharging super-dry air generated by a dry air generator along inner walls of the drying vessel to form air curtains on the inner walls. CONSTITUTION:A plastic 1 in a drying vessel 2 is agitated uniformly by agitating bladed 9 driven by a motor 8, whereby part of the plastic 1 is powdered. A dry air generator 3 generates super-dry air 15 to be fed into the drying vessel 2, and discharge the super-dry air 15 with compressing. The super-dry air discharged from air discharge ports 12b is blown down along inner walls 5, forming air curtains 7. The air curtains 7 are formed by the flow of the super-dry air in a broad and thin curtain-like form whereby the plastic 1 powdered and made lighter through agitation by the agitating blades 9 is blown off so as not to collect in an area where the agitating action is weak or be adhered to the inner walls 5 by static electricity. Therefore, the plastic 1 is agitated uniformly and dried uniformly.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides an air-type cleaning method for the wall surface of a plastic drying tank to prevent plastic powder from adhering to the wall surface of the plastic drying tank in which plastics are evenly heated and dried while stirring. Regarding equipment.

[Prior Art] Conventional plastic drying tanks have been of a type in which plastic stirring blades provided inside stir the plastic to evenly heat it, and drying air is blown into the tank.

[Problems to be Solved by the Invention] When stirring plastic, some of the plastic becomes powder due to friction between the stirring blade, the plastic, and other plastics, and is adhered to the wall of the plastic drying tank during stirring. It becomes easier. Furthermore, because the fine plastic particles attached to the wall are fixed in place, their water absorption rate is significantly different from the average. This has been a hindrance to accurately measuring the average dry state.

[Means for solving the problem] The present invention has been made by focusing on such problems,
A dry air generator W3 is provided above the wall surface 4 of the drying tank 2, and a dry air generator W3 is provided above the wall surface 4 of the drying tank 2 to make the air ultra-dry and feed it into the drying tank 2 for stirring and heating the plastic 1.
The dry air nozzle 6 discharges the ultra-dry air generated by the drying process along the inner wall 5 of the drying tank 2 in a wide-angle fan shape. Further, a drying air nozzle 6 is provided above the wall surface 4 of the drying tank 2 for the plastic 1,
It may also be arranged so that it discharges obliquely downward along the inner wall 5 in a wide-angle fan shape.

[Function] The air-type cleaning device for the wall surface of the plastic drying tank of the present invention has the following features:
This is to uniformly heat and dry the plastic 1 in the drying tank 2 and to prevent the plastic 1 from adhering to the inner wall 5 of the drying tank 2, which is one of the causes of uneven drying. That is, the drying air nozzle 6 discharges air in a wide-angle fan shape along the inner wall 5 of the drying tank 2 and blows it down, thereby blowing off the plastic 1 adhering to the inner wall 5. Furthermore, the air flow along the inner wall 5 removes some of the plastic 1. An air curtain 7, which is a layer of compressed air, is formed to prevent powdered matter from adhering. Further, the ultra-dry air discharged from the dry air nozzle 6 is discharged in a wide-angle fan shape to form a wide air curtain 7 against the inner wall 5. Furthermore, by directing the discharge direction of the ultra-dry air discharged from the dry air nozzle 6 diagonally downward, the area of the air curtain 7 can be made wider.

[Example code] Next, embodiments of the present invention will be explained based on the drawings.

FIG. 1 is an explanatory diagram of a plastic drying tank according to the present invention.

Symbol 1 is a plastic such as nylon, PP, PET, etc. in the form of granules, and a predetermined amount is put into the drying tank 2. The plastic 1 in the drying tank 2 is connected to the motor 8
The mixture is evenly stirred by stirring blades 9 driven by.

At this time, a part of the plastic 1 becomes powder. Reference numeral 10 denotes a heating drying device composed of a heater or a microwave generator, which dries the plastic 1 and the like. The dry air generator 3 is a device that generates, compresses, and sends out ultra-dry air 15 to be sent into the drying tank 2. The dry air generator 3 is a device that generates, compresses, and sends out ultra-dry air 15 to be sent into the drying tank 2. Air is supplied through the air port 11a, and at the same time, moisture generated from the plastic is discharged through the air exhaust port 11b of the drying tank 2. Symbol 16 is compressed air 1
Pressure regulator to adjust the pressure of 5, symbol 17 is air 15
This is a flow rate regulator that adjusts the flow rate of. A plurality of drying air nozzles 6 are provided above the wall surface 4 of the drying tank 2.
Air 15 is discharged to the inner wall 5 of the drying tank 2 in a wide-angle fan shape.

Further, the dry air generator 3 may be provided with a heater 10 to heat the air 15. Symbol 18 is motor 8. This is a controller that drives and controls the heating drying device 10.

FIG. 2 is an explanatory view of the dry air nozzle in a first blowing down state. The drying air nozzle 6 has an air inlet 12a provided outside the drying tank 2, and an air inlet 12a provided inside the drying tank 2, which injects ultra-dry air into the inner wall 5.
An air outlet 12b that blows down in a wide-angle fan shape along
It consists of The ultra-dry air discharged from the air discharge port 12b is blown down directly below along the inner wall 5 to form an air curtain 7. The air curtain 7 is a layer of compressed air formed by ultra-dry air flowing in a wide and thin state like a curtain, and the air curtain 7 is a layer of compressed air that is formed when ultra-dry air flows in a wide and thin state like a curtain. 1 has the role of blowing away so that it does not concentrate on the part where stirring accumulates or adhere to the inner wall 5 due to static electricity or the like. Therefore, it is possible to eliminate the retention of the plastic 1 on the surface of the inner wall 5.

FIG. 3 is an explanatory diagram of a second blowing down state of the dry air nozzle. In FIG. 3, the ultra-dry air discharged from the air discharge port 12b of the dry air nozzle 6 is blown diagonally downward along the inner wall 5, and is blown into the air curtain 7.
form. The air curtain 7 has a roughly triangular shape,
A curtain-free portion 14 of the air curtain 7 is formed in an inverted triangular shape between adjacent air curtains 7. Naturally, it is possible to use a large number of dry air nozzles 6 in order to reduce this area, but as shown in FIG. Unformed part 1
4 can be made smaller. Therefore, there is no need to increase the number of dry air nozzles 6 so much.

[Effects of the Invention] According to the present invention, the air curtain 7 generated by the drying air nozzle 6 causes the air to adhere to the inner wall 5 of the drying tank 2 due to static electricity or the like, or to rest in a place outside the drive area of the stirring blade 9. By blowing away the plastic 1 and throwing the plastic 1 into the stirring vortex again, the entire plastic 1 is stirred uniformly, which has the effect of uniformly drying it.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a plastic drying tank according to the present invention. FIG. 2 is an explanatory diagram of the dry air nozzle in the first blow-down state. FIG. 3 is an explanatory diagram of the dry air nozzle in a second blowing down state.

Claims (2)

[Claims] (1) A drying air generator installed in a plastic drying tank that evenly heats and dries the plastic while stirring it, and that makes the air ultra-dry and feeds it into the drying tank that stirs and heats the plastic, and the above-mentioned plastic drying device. It consists of a drying air nozzle installed above the wall of the drying tank that discharges ultra-dry air generated by a drying air generator in a wide-angle fan shape along the inner wall of the drying tank, forming an air curtain on the inner wall of the drying tank. An air-type cleaning device for the wall surface of a plastic drying tank. (2) In the air-type wiping device set forth in paragraph 1, which is installed in a plastic drying tank that evenly heats and dries the plastic while stirring the plastic, the drying air nozzle is placed above the wall surface of the plastic drying tank and diagonally downward along the inner wall. An air-type cleaning device for mural paintings in a plastic drying tank, characterized in that the device is arranged to discharge air in a wide-angle fan shape, and forms an air curtain on the inner wall of the drying tank.