JP2954367B2 - Equipment for drying goods - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates, after preheated by saturated steam articles relates dry 燥装 location of the article to dry by superheated steam.

[0002]

2. Description of the Related Art As a method for washing and drying precision parts and the like, a washing and drying method using a nonflammable solvent such as chlorofluorocarbon 113 and trichloroethylene has been used. In this method, the article is first immersed in a cleaning liquid and subjected to ultrasonic cleaning, followed by performing a cold shower with cold Freon, then performing finish drying with saturated Freon vapor, and further performing finish drying by air drying. Good quality dried products have been obtained due to the low surface tension and low latent heat of vaporization of the nonflammable solvent.

[0003] An aqueous washing and drying method is also known. In this case, washing with a chemical such as sodium alkylbenzenesulfonate (ABS-based activator), rinsing, washing with ultrapure water, and isopropanol are then performed. , Acetone, etc., and finish drying by warm air drying. Further, a method has been proposed in which the article is washed and then dried with superheated steam.

[0004]

However, in these conventional washing and drying methods, there is a problem that the use of nonflammable solvents such as Freon 113 and trichloroethylene is restricted due to the influence on the environment. In the case of water-based systems, there is no suitable drying method, and water is replaced with flammable solvents such as isopropanol and acetone, and dried with warm air such as air or nitrogen gas or carbon dioxide gas. In the case of operation and operation, the device becomes complicated, and there are problems in terms of safety and performance.

[0005] In the method of drying the washed articles with superheated steam, the time required for drying can be shortened and the quality can be maintained by low oxygen. It is not preferable to put it inside because there is a problem that a watermark (a spot left behind a water drop, also referred to as a water mark) is formed on the surface of the article.

[0006]

The present inventors have made intensive studies in view of the above-mentioned conventional problems, and as a result, have reached the present invention .

That is , according to the present invention, a preheating chamber having a saturated steam jet port for preheating an article, a drying chamber having a superheated steam jet nozzle for drying a preheated article, A first exhaust unit that sucks and exhausts the saturated steam ejected in the chamber together with the outside air, a circulation unit that circulates the superheated steam injected in the drying chamber and supplies the superheated steam to the superheated steam injection nozzle, And a second exhaust means for sucking and exhausting the water vapor together with the outside air.

[0008]

According to the present invention, the article is preheated with saturated steam and then dried by using superheated steam (also referred to as dry steam or dry steam, which is steam having a temperature higher than the saturated steam temperature). There is a feature in making it work.

In the case of drying an article, if a low-temperature article is put in hot air or superheated steam, a water mark (a spot left behind a water droplet, also called a water mark) is formed on the surface of the article. It is not preferable because it can be done. On the other hand, when the article is preheated with saturated steam and then rapidly dried with superheated steam as in the present invention, the generation of watermarks can be prevented, and the article can be efficiently and well dried.

[0010] The temperature of the superheated steam is not particularly limited, but it is 130 to 800 ° C, preferably 250 to 450 ° C under atmospheric pressure. The articles to be dried are particularly effective for glass tubes, ceramics, precision parts having complicated shapes, and the like. The movement of the article during drying by the drying apparatus of the present invention is performed in a tact system, and can be continuously moved in a batch system at a predetermined tact distance at a predetermined tact time.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the illustrated embodiments, but the present invention is not limited to these embodiments. FIG. 1 is a schematic view of an embodiment of an article drying apparatus according to the present invention.

This drying apparatus has a preheating chamber 2, a rear chamber 3 before and after the drying chamber 1, and a suction hood 14 in front of the preheating chamber 2.
The article 4 to be dried is conveyed by the conveyor 5 to the preheating chamber 2 →
The drying chamber 1 is transferred to the rear chamber 3. In addition, an evaporator 6 is provided, and pure water is sent in and evaporated, and is ejected from an ejection nozzle 9 provided at an upper portion of the preheating chamber 2 to the preheating chamber 2, and together with superheated steam from the drying chamber 1. The steam circulated and reheated by the steam heater 15 is injected into the drying chamber 1 from an injection nozzle 8 provided at the upper part of the drying chamber 1.

Next, the operation of the above device will be described.
A glass tube is used as an object to be dried. First, ultrasonic cleaning with a neutral detergent is performed as a pre-drying step, followed by rinsing with pure water. Next, the container 10 containing the glass tube 4 that has been subjected to the above pretreatment is placed on the conveyor 5 and sent into the preheating chamber 2. In the preheating chamber 2, saturated steam at 100 ° C. and 1 atm, which was sent from the evaporator 6, was injected from the ejection port 9 into the glass tube 4 for preheating. Excess steam is discharged from the suction hood 14 by the exhaust fan 20. In addition,
The drain liquid is discharged from a lower part of the preheating chamber 2.

The preheating chamber 2 is connected to the outside air by a shut-off door 12 such as a plate, a door or a curtain, and the drying chamber 1 is shut by a shut-off door 13.
And each is shut off. Next, the glass component 4 is sent into the drying chamber 1. In the drying chamber 1, at 100 ° C. under atmospheric pressure,
The steam of 1 atm.
Superheated steam heated to 0 ° C. was produced, and injected from the injection nozzle 8 to the glass tube 4. Although the steam temperature at the superheated steam outlet 16 changes depending on the drying state of the material to be dried, the steam is circulated and used together with the steam from the evaporator 6. In addition, drying room 1
The drain liquid is discharged from the lower part of the. The circulating steam is superheated by the steam superheater 15 to a predetermined temperature, in this example, 300 ° C., and is injected from the injection nozzle 8. Reference numeral 18 denotes a blower.

Next, the glass tube 4 dried for a predetermined time (3.5 minutes in this example) in the drying chamber 1 is transferred to the rear chamber 3. The rear room 3 is shut off from the outside air by a shutoff door 22, and is provided with a ventilation port 23 for discharging leaking steam and the like.
Is provided. Further, at the boundary with the drying chamber 1, a shut-off door 24 is provided, and these doors 22 and 24 are connected to the doors 12 and 1.
Like the glass tube 3, the glass tube 4 can be opened and closed only when the glass tube 4 enters and leaves the room. In addition, the ventilation opening 23
Heater 2 to prevent condensation on walls and ceiling between
1 to keep the wall temperature at 100 ° C. or higher.
As described above, when the glass tube 4 was dried at a tact time (drying interval) of 3.5 minutes, good drying could be performed.

[0016]

As described above, the dryness of the article of the present invention can be improved.
According to 燥装 location, to be dried article was preheated by saturated steam, since the drying by superheated steam, efficiently there is no fear articles which generation of water marks on the surface of the article, to perform a good drying Can be.

[Brief description of the drawings]

FIG. 1 is a schematic view of an embodiment of an apparatus for drying articles according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drying room 2 Preheating room 3 Back room 4 Article 5 Conveyor 6 Evaporator 7 Cyclone 8 Injection nozzle 9 Ejection nozzle 10 Container 15 Steam superheater 21 Heater

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Claims (1)

(57) [Claims] 1. A preheating chamber having a saturated steam jet port for preheating an article, a drying chamber having a superheated steam jet nozzle for drying a preheated article, and a saturated jet spouted from the preheating chamber. First exhaust means for sucking and exhausting steam together with outside air, circulating means for circulating superheated steam injected in the drying chamber and supplying it to the superheated steam injection nozzle, and sucking steam from the drying chamber together with outside air And a second exhaust means for exhausting the air.