JPH08200951A - Draining drying method for article and device therefor - Google Patents

Abstract

PURPOSE: To reliably recover perfluoro organic compound steam and to substantially prevent leakage of a solvent to the atmosphere by a method wherein exhaust gas from a drying device is caused to pass through a solvent recovery device incorporating such an adsorbent as activated charcoal. CONSTITUTION: An article 20a, such as an electronic part, after washing is moved in a partition chamber at an input and output zone 6. By rotating a turn table 21, the article is moved to a draining zone 1 and immersed in a solvent in a draining tank and moisture is removed through ultrasonic treatment. A draining article 20b is moved to a rinse zone and rinsed by a interfacial active agent in the solvent by rinsing by means of perfluoro organic compound steam heated and vaporized in a liquid reservoir arranged on the bottom of a rinse tank 13 and thereafter, the article is moved to a dry zone 8. At the dry zone 8, the rinse liquid of an article 20d is dried for removal. Exhaust gas from the partition chamber is fed to a solvent recovery device 9 and adsorbed to activated charcoal 10 to recover a perfluoroorganic compound. The dried article 20d is returned to the input and output zone 6 and taken out from a hatch 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for removing water from articles such as electronic parts and mechanical parts that have been washed with water to dry them.

[0002]

2. Description of the Related Art Conventionally, CFC 113, 1.1.1-trichloroethane, etc. have been used for cleaning electronic parts and mechanical parts, but due to the problem of ozone layer depletion in the stratosphere,
Since the use of these solvents has been banned, active research has been conducted on switching to water washing. This water washing method requires draining and drying.

Therefore, as a substitute for the Freon 113, a method of draining and drying an article using a perfluoroorganic compound and an apparatus therefor have been proposed (JP-A-5-114594).
Issue). A perfluoro organic compound is a compound in which all the hydrogen atoms of the organic compound are replaced with fluorine atoms and does not contain a chlorine atom which is a cause of ozone layer depletion. Not only does it not destroy the ozone layer, it is harmless to the human body and Since it is an incombustible and inert liquid, it does not adversely affect various members. Further, its physical properties are similar to those of CFC 113, and in particular, surface tension, specific gravity, heat of vaporization and the like are suitable as a solvent for draining and drying.

FIG. 4 is an explanatory view of the above-mentioned draining and drying device. This apparatus is provided with a water separation tank 5, a perfluoroorganic compound, and a draining tank 1 equipped with an ultrasonic device 1a, a perfluoroorganic compound boiling tank 2, and a perfluoroorganic compound vapor rinsing tank 3. The device to which water has adhered is an apparatus for sequentially moving from the water draining tank 1 to the boiling tank 2 and the rinse tank 3 to drain water and dry it. The water separation tank 5 is configured to remove water from the solvent overflowing from the water draining tank 1 and return it to the water draining tank 1. Since this device is an open system, it has a structure in which a cooling coil is provided in the upper part of the tank to condense and collect the solvent vapor, but it cannot reliably collect it.

[0005]

SUMMARY OF THE INVENTION Therefore, the present invention solves the above-mentioned drawbacks, drains and dries the parts, and surely recovers the perfluoroorganic compound vapor to substantially prevent the leakage of the solvent into the atmosphere. An object of the present invention is to provide a method for draining and drying a component that can be prevented and an apparatus therefor.

[0006]

According to the present invention, (1) an article after being washed with water is immersed in a solvent containing a perfluoroorganic compound as a main component and a surfactant and treated with ultrasonic waves or a jet stream. Then, the article is characterized in that the article is steam-cleaned in a vapor of a perfluoroorganic compound to rinse the surface active agent, further transferred to a drying chamber, and exhaust gas in the drying chamber is recovered by an adsorbent and reused. Draining method, and (2) Perfluoro organic compound as a main component, containing a solvent with a surfactant added, a draining tank equipped with ultrasonic waves or jet means, and a surface active with perfluoro organic compound vapor A rinse tank that removes the agent and a drying tank that is equipped with a device that recovers the solvent from the exhaust gas are arranged in an annular shape, and a turntable type moving mechanism is provided at the top of the tank to enable the movement of articles between the tanks. Of articles characterized by Closed type is a draining drying apparatus.

[0007]

In the present invention, a closed system is adopted for the draining / drying device, and in particular, the exhaust gas from the drying device is attached to the solvent recovery device having a built-in adsorbent such as activated carbon, so that the solvent as the draining agent is almost completely removed. It is possible to collect and reuse it, and it is possible to reduce the running cost by greatly reducing the solvent loss without polluting the air. Examples of the perfluoro organic compound used in the present invention include perfluorocarbon, perfluorohexane, perfluorocyclohexane and perfluorononane.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram for explaining the draining and drying method of the present invention. FIG. 2 is a perspective view of a draining / drying device that employs a turntable, and FIG. 3 is a plan view for explaining each processing zone of the turntable. In this device, a turntable 21 composed of four compartments divided by partitions 16a to 16c and the like is arranged above the draining tank 11 and the rinse tank 13, and the partition located above the draining tank 11 and the rinse tank 13 is arranged. The chambers were a draining zone 1 and a rinsing zone 3, a compartment located in front of the draining zone 1 was an article loading / unloading zone 6, and a compartment located behind the rinsing zone 3 was a drying zone 8.

An ultrasonic device 12 is provided at the bottom of the draining tank 11, and a solvent containing a perfluoroorganic compound as a main component and a surfactant is contained in the tank. The water-containing solvent separated from the article 20b is the water separator 1
8), the solvent having a high specific gravity is collected from the bottom into the solvent replenishing tank 19, and after replenishing the draining agent, it is jetted into the draining tank 11 by a pump, and the solvent in the draining tank 11 is stirred to improve the cleaning power. Let

In the rinse tank 13, the solvent in the liquid reservoir 14 at the bottom is heated and boiled by a heater or the like, and the perfluoro organic compound vapor is held in the tank to wash the article 20c with steam and rinse the surface active agent. A cooling coil 15 is arranged above the rinse tank 13 to condense the perfluoro organic compound and
Spray into the bath at 6. Further, the vapor taken out from the bottom of the rinse tank 13 is condensed by the cooler 22 and returned to the solvent tank 19.

In the four compartments of the turntable 21,
A compartment for lifting and lowering the article 20 and a hatch 7 for loading and unloading the article 20 are provided. The compartments located above the drainer tank 11 and the rinse tank 13 are connected to each tank so that the article 20 can be lowered. It is designed to hold a closed system to the outside system. In addition, in the compartment located in the drying zone 8,
A solvent recovery device 9 filled with activated carbon can be connected, and exhaust gas is recovered from the compartment of the drying zone 8 to the solvent recovery device 9 to adsorb the solvent on the activated carbon. The solvent is collected by sending hot air to the adsorbent to desorb it.

The procedure of draining and drying by the turntable method will be described below. The article 20a after being washed with water, such as an electronic component or a mechanical component, is the article 20 that has been drained and dried by opening the hatch 7 of the compartment located in the loading / unloading zone 6.
After removing d, the article 20a is placed in the compartment, the hatch 7 is closed, and the turntable 21 is rotated to move to the draining zone 1.

Next, the article 2 moved to the draining zone 1
0b drops into the draining tank 11, is immersed in a solvent and is treated with ultrasonic waves emitted from the ultrasonic device 12,
Remove the water that adheres to. The relatively light solvent with the increased amount of water overflows the wall of the draining tank 11 and overflows the water separator 18
And water is separated by the difference in specific gravity, and then the solvent replenishment tank 1
After being moved to 9 and supplemented with a draining agent, it is returned to the draining tank 11 by a pump. Then, the drained article 20b is pulled up from the drainage tank 11 into the compartment, and the turntable 2
1 is rotated and moved to the rinse zone 3.

Article 20c moved to rinse zone 3
Is dropped into the rinse tank 13 and rinsed with the perfluoroorganic compound vapor that has been heated and evaporated in the liquid reservoir provided at the bottom of the tank to rinse the surfactant in the solvent. The rinsed article 20c is again moved to the drying zone 8 by the rotation of the turntable 21.

The articles 20d transferred to the drying zone 8 are
The rinse liquid of the perfluoroorganic compound is dried and removed, the exhaust gas from the compartment is sent to the solvent recovery device 9 and adsorbed by the activated carbon 10, and the dry air is returned to the compartment of the drying zone 8. The perfluoro organic compound adsorbed on the activated carbon 10 is desorbed and collected with hot air. The dried article 20d is returned to the loading / unloading zone 6 by rotating the turntable 21 and taken out from the hatch 7.

In the present invention, by adding a surfactant to the perfluoroorganic compound, the performance of removing water adhering to the article after washing with water can be enhanced, and the draining and drying device is kept in a closed system. As a result, the solvent can be almost completely recovered and reused, so that the running cost can be significantly reduced.

Table 1 below shows the comparison of the physical properties of the perfluoro organic compound (Aqua Dry NS10, manufactured by Asahi Kasei Co., Ltd.) used in the above examples with that of CFC 113 used conventionally.

[0018]

[Table 1]

[0019]

According to the present invention, by adopting the above-mentioned constitution, a solvent having an excellent draining performance can be used, and the draining and drying can be carried out by a closed apparatus comprising a draining tank, a rinse tank and a drying chamber. Since the air is not polluted and the solvent can be almost completely recovered and reused, the consumption of the solvent can be significantly reduced and the running cost can be reduced.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a closed drainer according to an embodiment of the present invention.

FIG. 2 is a perspective view of a closed type draining / drying device of the present invention which employs a turntable.

FIG. 3 is a plan view for explaining each processing zone of the turntable of FIG.

FIG. 4 is a configuration diagram of a conventional drainer / dryer.

Claims (2)

[Claims] 1. An article after being washed with water is immersed in a solvent containing a perfluoroorganic compound as a main component and a surfactant and treated with ultrasonic waves or a jet stream, and then the article is exposed to perfluoroorganic compound vapor. A method for draining and drying an article, which comprises: rinsing with a steam to rinse the surface-active agent, further moving to a drying chamber, and collecting exhaust gas in the drying chamber with an adsorbent for reuse. 2. A perfluoro organic compound as a main component,
Drainage tank containing a solvent with a surfactant added, equipped with ultrasonic waves or jetting means, a rinse tank for removing the surfactant with perfluoroorganic compound vapor, and a drying device equipped with a device for recovering the solvent from the exhaust gas. A closed drainer for articles, characterized in that the tanks are arranged in an annular shape, and a turntable-type moving mechanism is provided on the upper part of the tanks to enable movement of articles between the tanks.