WO2009110548A1

WO2009110548A1 - Method and system for washing electronic component

Info

Publication number: WO2009110548A1
Application number: PCT/JP2009/054167
Authority: WO
Inventors: 秀明菊地
Original assignee: 三井・デュポンフロロケミカル株式会社
Priority date: 2008-03-07
Filing date: 2009-03-05
Publication date: 2009-09-11
Also published as: JPWO2009110548A1; TW200946254A

Abstract

A method of washing electronic components comprises a purifying step of purifying an unused fluorine-containing organic detergent composition liquid by a purifier and a washing step of washing electronic components using the purified detergent composition liquid supplied from the purifier into a washing device. In the purifying step, at least the organic contaminants are removed by a rectifying device and solid contaminants are removed by a filter device.

Description

Electronic component cleaning method and cleaning system

The present invention relates to a method and a cleaning system for cleaning an electronic component using a fluorine-containing organic cleaning composition liquid.

Conventionally, as a device for cleaning electronic components such as silicon wafers, silicon chips, and printed boards using a fluorine-containing organic cleaning composition liquid (hereinafter sometimes referred to as “fluorine-based cleaning liquid”), vapor degreasing is used. A cleaning device is used (for example, Patent Document 1).
In addition, a method has also been proposed in which a dirty fluorine-based cleaning liquid in a cleaning device used for cleaning an electronic component is put into a regeneration device provided separately to be regenerated and used again for cleaning the electronic component (for example, Patent Document 2).
U.S. Pat.No. 3,881,949 JP 2001-129302 A

In recent years, with the increase in the density of elements and wiring in electronic components, the amount of residue generated in the pattern formation of elements and wiring that has been permitted in the past has become unacceptable. Since it is becoming narrower, higher purity of the fluorine-based cleaning liquid is demanded.
On the other hand, in the conventional vapor degreasing cleaning device, dirt components are accumulated in the cleaning device, and the cleaning capability of the fluorine-based cleaning solution in the cleaning device decreases with time. Therefore, the unused fluorine-based cleaning solution or the regenerated fluorine-based cleaning device It was necessary to change frequently with the cleaning solution.

However, since unused fluorine-based cleaning liquid is usually contained in a container and transported from the manufacturer to the site of use, a slight contamination component in the container is mixed in the fluorine-based cleaning liquid, and the container is opened. When the fluorine-based cleaning liquid is introduced into the cleaning device, it is considered that the fluorine-based cleaning liquid comes into contact with the external atmosphere and dirt components in the external atmosphere are mixed into the fluorine-based cleaning liquid. However, it cannot be said that it is used with the required high purity.
Also, in the case of the regenerated fluorine-based cleaning liquid, the regenerated fluorine-based cleaning liquid is accommodated in the container from the regenerating apparatus and transported, and the container is opened and the fluorine-based cleaning liquid is introduced into the cleaning apparatus. Since the fluorine-based cleaning liquid is contaminated in the same manner as described above, it cannot be said that the regenerated fluorine-based cleaning liquid is used at the required high purity.
Therefore, it is desired to use a fluorine-based cleaning liquid having a higher purity in order to clean electronic components that tend to be denser and finer.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a method of cleaning an electronic component that can use a fluorine-based cleaning liquid with high purity, and a cleaning system using the same.
That is, according to the present invention, a purification step of purifying an unused fluorine-containing organic detergent composition liquid by a purification apparatus and a purified detergent composition liquid supplied from the purification apparatus into the cleaning apparatus are used. And cleaning the electronic component, and in the purification step, the organic composition is removed by a rectifying device and the solid contaminant is removed by a filter device to purify the cleaning composition liquid. There is provided a method of cleaning an electronic component using the thus-purified cleaning composition liquid.

According to another aspect of the present invention, there is provided a cleaning system for cleaning an electronic component by the cleaning method, wherein a contaminant contained in an unused fluorine-containing organic cleaning composition liquid is removed and purified. And a rectifying device for removing organic contaminants, and a cleaning device for cleaning an electronic component using the cleaning composition liquid purified by the purifying device. There is provided a cleaning system for an electronic component that includes at least a filter device for removing solid contaminants and is configured to purify the rectifying device and the filter device through the cleaning composition liquid.

According to the present invention, an unused fluorine-based cleaning liquid transported from a manufacturer of a fluorine-containing organic detergent composition liquid (fluorine-based cleaning liquid) is charged from the container into a purification apparatus, The cleaning liquid can be purified by removing the dirt component in the cleaning liquid.
Therefore, the manufacturer has filled the container with a small amount of dirt components with the fluorine-based cleaning liquid, so even if dirt components are mixed in the fluorine-based cleaning liquid, the purification equipment removes the dirt components in the fluorine-based cleaning liquid. The electronic component can be cleaned by supplying the purified high-purity fluorine-based cleaning liquid to the cleaning device without contacting the external atmosphere. In other words, according to the present invention, it is possible to prevent deterioration of the quality of electronic components caused by unused fluorine-based cleaning liquid.
Accordingly, the present invention provides a silicon wafer, a ceramic wafer, a silicon chip obtained by cutting the silicon wafer, a ceramic chip obtained by cutting the ceramic wafer, a glass substrate, a metal substrate, a color filter substrate, a printed circuit board, and an electronic component using these. It is possible to cope with higher density and miniaturization of electronic components.
In addition, it becomes possible to always clean electronic components with a fluorine-based cleaning liquid that has been cleaned to a high purity, and stable cleaning quality can be ensured.

It is a schematic block diagram which shows Embodiment 1 of the washing | cleaning system of this invention. It is a schematic block diagram which shows Embodiment 2 of the washing | cleaning system of this invention. It is a schematic block diagram which shows Embodiment 3 of the washing | cleaning system of this invention. It is a schematic block diagram which shows Embodiment 4 of the washing | cleaning system of this invention. It is a schematic block diagram which shows Embodiment 5 of the washing | cleaning system of this invention. It is a schematic block diagram which shows Embodiment 6 of the washing | cleaning system of this invention. It is a schematic block diagram which shows Embodiment 7 of the washing | cleaning system of this invention. It is a schematic block diagram which shows Embodiment 8 of the washing | cleaning system of this invention. It is a schematic block diagram which shows Embodiment 9 of the washing | cleaning system of this invention.

Explanation of symbols

10, 100, 100A, 100B,

100C Cleaning device

11, 110

Body

12, 120

Cleaning tank

12a,

150a Heater

13, 130

Rinsing tank

13a, 130a

Ultrasonic generator

14, 140a

Steam condensing part

14a,

140a Condensation pipes

14b, 140b Saddle 14c, 22, 140c, 220 Water separator 17

Shower nozzle

20, 200

Purification device

21, 210 Counter-current

water contact column

23, 230

Hygroscopic column

24, 240 Ionic

contaminant removal column

25, 160

Distillation tower

26 , 260 Filter 30 Regenerator 31 Circulation piping 41 Purification buffer tank 42 Regeneration buffer tank 120a Heater or ultrasonic generator 150 Steam generation tank C Fluorine-containing organic detergent composition liquid (fluorine-based cleaning liquid)
S vapor layer

The method for cleaning an electronic component according to the present invention includes a purification step of purifying an unused fluorine-containing organic cleaning composition liquid by a purification apparatus, and a purified cleaning composition liquid supplied from the purification apparatus into the cleaning apparatus. In the purification process, at least removal of organic contaminants by a rectifying device and removal of solid contaminants by a filter device are performed, and water-soluble contamination by a water cleaning device is performed. You may remove the thing arbitrarily.

In the purification step, the order of removing organic contaminants, water-soluble contaminants, solid contaminants is arbitrary, but from the viewpoint of efficiently removing each contaminant, organic contaminants, water-soluble contaminants, It is preferable to purify the detergent composition liquid by removing in the order of solid contaminants, or in the order of water-soluble contaminants, organic contaminants, and solid contaminants.

Although this cleaning method does not limit the object to be cleaned, a silicon wafer, a ceramic wafer, a silicon chip obtained by cutting the silicon wafer, and the ceramic wafer are required to be highly cleaned with a high-purity fluorine-based cleaning liquid. It is suitable for cleaning electronic components such as cut ceramic chips, glass substrates, metal substrates, color filter substrates, printed boards and electronic components using these.
This cleaning method can also be used as a cleaning method for other objects to be cleaned, such as liquid crystal cells, PDP panels, stampers, molds, magnetic heads, VCMs (voice coil motors), HSAs (head stack assemblies), and cassettes. .

In the present invention, as the fluorine-based cleaning liquid, those suitable for cleaning electronic components can be used.
Examples of the fluorine-containing organic detergent composition liquid include fluorine compounds that have a molecular weight of less than 1000, contain carbon atoms and fluorine atoms in the skeleton, and are liquid and volatile at room temperature. The fluorine compound is not particularly limited, but preferably contains hydrogen atoms in order to shorten the lifetime in the atmosphere from the viewpoint of preventing global warming. Furthermore, you may contain hetero atoms, such as an oxygen atom, a sulfur atom, and a nitrogen atom. The carbon skeleton may be linear, branched or cyclic, and may have a double bond or a triple bond.

Examples of the fluorine-based cleaning liquid having such characteristics include nonafluorobutyl methyl ether, 1,1,1,2,2,3,4,5,5,5-decafluoropropane, 1,2,2, 2-tetrafluoroethyl-2,2,2-trifluoromethyl ether, 1,1,1,3,3-pentafluorobutane, 1,1,2,2,3,3,4-heptafluorocyclopentane, Examples thereof include dichloropentafluoropropane, among which 1,1,1,2,2,3,4,5,5,5-decafluoropropane is preferable.
In the present invention, the fluorine-based cleaning liquid may be a mixture of one or more fluorine-based cleaning liquids.
Further, it may be one or a mixture of two or more of a fluorine-based cleaning liquid and another organic solvent. Examples of the organic solvent include alcohols such as 2-propanol and ethanol, ketones such as acetone, ethers such as diethyl ether, organic acids such as acetic acid, esters such as ethyl acetate, dichloroethylene, dichloropentafluoropropane, etc. And halogenated hydrocarbons.
Depending on the type of electronic component or dirt, a mixture (azeotropic mixture) of a fluorine-based cleaning liquid and a water-soluble organic solvent (for example, alcohol) may be used as the cleaning liquid. In this case, the purification step does not include a water-soluble contaminant removal step.
In addition, when the fluorine-based cleaning liquid is a mixture having an azeotropic composition, a mixing ratio in the azeotropic composition is desirable.

Next, the cleaning system of the present invention for cleaning electronic components by this cleaning method will be described.
This cleaning system includes a purification device that removes and purifies contaminants contained in an unused fluorine-containing organic cleaning composition liquid, and an electronic component using the cleaning composition liquid purified by the purification apparatus. A cleaning device for cleaning, wherein the purification device includes at least a rectifying device for removing organic contaminants and a filter device for removing solid contaminants, and the cleaning agent is provided in the rectifying device and the filter device. It is comprised so that it may refine | purify through a composition liquid, and may further be equipped with the water washing apparatus which removes a water-soluble contaminant, and the water removal apparatus which removes a water | moisture content.

In the purification apparatus, the rectification apparatus, the water washing apparatus, the water removal apparatus, and the filter apparatus may be arranged in any order. However, from the viewpoint of efficiently removing each contaminant as described above, the purification apparatus is a rectification apparatus. The apparatus is preferably configured to purify through the detergent composition liquid in the order of apparatus, water cleaning apparatus, moisture removing apparatus and filter apparatus, or in the order of water cleaning apparatus, moisture removing apparatus, rectifying apparatus and filter apparatus.

(Description of cleaning device)
In the present invention, the cleaning device is not particularly limited as long as it contains a fluorine-based cleaning liquid for removing dirt attached to the electronic component and is configured to clean the electronic component in the cleaning device. Is not to be done.
As the cleaning device, for example, a rinsing tank to which a fluorine-based cleaning liquid purified by a purification device is supplied, a cleaning tank that receives and heats the fluorine-based cleaning liquid overflowing from the rinsing tank, and heating in the cleaning tank A vapor retaining part in which the vapor of the vaporized fluorine-based cleaning liquid stays, and a steam condensing part for condensing the steam in the steam-retaining part and returning it to the rinsing tank, and in the fluorine-based cleaning liquid in the cleaning tank An electronic component is immersed and washed in the cleaning tank, and the cleaned electronic component is immersed and rinsed in a fluorine-based cleaning solution in the rinsing tank, and the rinsed electronic component is steam-washed with the steam in the steam retaining portion. The thing which was done is mentioned.
Specifically, for example, a known multi-tank cleaning apparatus described in JP-A-8-243515, JP-A-10-192797 and the like can be used.

The cleaning device may further include a shower nozzle, and the fluorine-based cleaning liquid purified by the purification device may be ejected from the shower nozzle to shower-wash the electronic component after the steam cleaning.
If comprised in this way, the cleanliness of the electronic component by the washing | cleaning system of this invention can be raised more.

(Description of purification equipment)
The purification apparatus according to the present invention removes dirt components mixed in an unused fluorine-based cleaning liquid according to the kind of the dirt, and as described above, a rectification apparatus that removes organic contaminants. And a filter device that removes solid contaminants, and further includes a water cleaning device that removes water-soluble contaminants, a moisture removal device that removes moisture, and an ionic contaminant removal device that removes ionic contaminants. It may be.

In the present invention, the types of contaminants include the organic contaminants, water-soluble contaminants, ionic contaminants, and solid contaminants. Specific examples of these various contaminants include the following.
Examples of the organic contaminant include fluorine oil (for example, Krytox (registered trademark)), fluorine polymer, and the like.
Examples of water-soluble contaminants include alcohols such as isopropyl alcohol and ethanol, and ketones such as acetone.
Examples of ionic contaminants include ions such as fluorine ions, nitrate ions, hydrogen carbonate ions, ammonium ions, and sodium ions.
Examples of solid contaminants include organic polymer compound particles such as plastics and elastomers, metal particles, and dust.
Hereinafter, a specific configuration of the purification apparatus will be described. Needless to say, the purification apparatus may have an apparatus for removing contaminants other than those described above.

<Rectifying device>
As a rectifying device, organic substances contained in unused fluorine-based cleaning liquids are obtained by heat exchange using the difference between the boiling point of fluorine-based cleaning liquids and the boiling point of organic contaminants (hereinafter referred to as “boiling point difference”). It can be configured to remove contaminants.
For example, when the boiling point difference is small, a heat exchange action is required multiple times for the separation of the fluorine-based cleaning liquid and the organic contaminants, and a rectification apparatus having a high reflux function is selected, and the boiling point difference is reduced. If larger, a simple distillation apparatus or a heating apparatus that heats the fluorine-based cleaning liquid without boiling is selected.
As described above, the rectifying apparatus is appropriately selected depending on the difference in boiling point between the fluorine-based cleaning liquid and the organic contaminant or the cleanliness required for the electronic component.
In addition, when the rectification apparatus (for example, distillation apparatus) is integrated with the washing | cleaning apparatus, a rectification apparatus can be abbreviate | omitted from a refinement | purification apparatus.

<Water cleaning device>
To remove water-soluble contaminants contained in the fluorine-based cleaning solution, it is effective to bring the fluorine-based cleaning solution into contact with water and dissolve the water-soluble contaminants in water. Is preferred. The contact method is not particularly limited, but a counter-current contact method is preferable in view of simplicity and handling.
As such a water contact device, for example, a plurality of partition plates are arranged inside a cylinder having a cleaning liquid inlet and a water outlet at the upstream end and a cleaning liquid outlet and a water inlet at the downstream end. Or the water contact apparatus of the structure which raised the contact rate of the fluorine-type washing | cleaning liquid and water in an internal flow path by filling with a filling material is mentioned. The water contact device having such a configuration has a counter-current type contact in which an upstream end is arranged at the upper part and a downstream end is arranged at the lower part, and the fluorine-based cleaning liquid is poured from the upper part to the lower part in the water stream flowing from the lower part to the upper part. It is preferable to adopt a method.

Further, when the fluorine-based cleaning liquid is brought into contact with water, water is dissolved in the fluorine-based cleaning liquid in a small amount, but the moisture removing device for removing water in the fluorine-based cleaning liquid is provided downstream of the water contact device. It is attached.
As described above, when the cleaning liquid is composed of a mixture of a fluorine-based cleaning liquid and a water-soluble organic solvent, the water cleaning device and the water removing device are omitted from the purification device.

<Moisture removal device>
As the moisture removing device, for example, a moisture removing device having a structure in which a granular moisture absorbent typified by zeolite is filled inside a cylinder having a cleaning liquid inlet at the upstream end and a cleaning liquid discharge port at the downstream end. Can be mentioned. In addition, when the water-soluble contaminant also has ionicity, the water-soluble contaminant removal by the water contact device and the water removing device also serves as ionic contaminant removal.

Further, since there is a limit to the amount of moisture adsorbed by the hygroscopic material, the moisture removing device may include a moisture discharging means for discharging the moisture adsorbed on the hygroscopic material to the outside.
Examples of the moisture discharge means include an air inlet and an air outlet formed at the upstream end and the downstream end of the moisture removing device, a hot air supply device that sends hot air to the air inlet, or room temperature air at the air inlet. What is comprised is equipped with the band heater wound around the blower which sends in and a cylinder, and the inside is heated, and the moisture absorption material is dried by letting the heated air pass through a cylinder.
Moreover, it is preferable that two or more moisture removal apparatuses are installed in parallel. In this way, when the moisture absorbent material of one moisture removing device is being dried, the moisture in the fluorine-based cleaning liquid can be removed by the other moisture removing device. The cleaning liquid cleaning efficiency can be increased.

In addition, a part of the peripheral wall of the cylinder is formed of a transparent window, and a saturated indicator such as blue silica gel is mixed with the hygroscopic material, so that the moisture absorbent absorbs moisture depending on the color of the saturated indicator. You may make it visible visually (degree of drying). Alternatively, a moisture measuring device may be installed on the downstream side of the moisture removing device, and the moisture content in the air used for drying may be measured by the moisture measuring device to examine the degree of drying of the moisture absorbent.
Furthermore, in order to improve the moisture removal efficiency by the hygroscopic material, water separation that separates the fluorine-based cleaning liquid and water using the difference in specific gravity between the fluorine-based cleaning liquid and the water dissolved in the fluorine-based cleaning liquid A vessel may be installed between the water contact device and the water removal device.

<Ionic contaminant removal device>
As the ionic contaminant removal apparatus, for example, an ionic contaminant removal apparatus having a configuration in which alumina gel is filled inside a cylinder having a cleaning liquid inlet at the upstream end and a cleaning liquid discharge outlet at the downstream end is provided. Can be mentioned.

<Filter device>
Examples of the filter device for removing solid contaminants include a filter device in which a microfiltration membrane, an ultrafiltration membrane, and the like are provided in a cylinder through which a fluorine-based cleaning liquid passes. In this case, the solid contaminants removed by the filter device are discharged from the cylindrical body to the outside by replacing the filter. A plurality of the same filtration membranes or different filtration membranes may be used in combination.

From the viewpoint of efficiently removing the various contaminants described above, the purification apparatus in the present cleaning system is, in order from the upstream to the downstream, the rectification apparatus, the water cleaning apparatus, the water removing apparatus, and the filter apparatus in this order, or the water cleaning apparatus, It is preferable that each device is connected continuously by piping in the order of the moisture removing device, the rectifying device, and the filter device. In addition, when a refinement | purification apparatus has an ionic contaminant removal apparatus, if it is except between a water washing apparatus and a water | moisture-content removal apparatus, the installation position of an ionic contaminant removal apparatus is not specifically limited.

<Other configurations>
The cleaning system further includes a regeneration device that regenerates the used fluorine-based cleaning liquid used for cleaning the electronic components in the cleaning device, and the regeneration device is connected to the cleaning device by a circulation pipe, and the used fluorine-based cleaning liquid. May be configured to be supplied from the cleaning device to the regenerator and regenerated, and the regenerated fluorine-based cleaning liquid is circulated and supplied from the regenerator to the cleaning device.
By integrating the regenerator into the cleaning system in this way, the used dirty fluorine-based cleaning liquid is transferred from the cleaning apparatus to the regenerator through the circulation pipe, and the regenerated fluorine-based cleaning liquid is recirculated from the regenerator to the circulation pipe. Through the cleaning device. As a result, in addition to being able to transfer the fluorine-based cleaning liquid easily and in a short time, the regenerated fluorine-based cleaning liquid can be transferred to the cleaning device without contacting the external environment. It is possible to avoid contamination by contaminants.

In the present invention, the regenerator only needs to be able to remove various contaminants contained in the used fluorine-based cleaning liquid, and more preferably, the regenerating apparatus is a high-purity fluorine-based cleaning liquid similar to the purity before use. Anything that can be reproduced is acceptable.
For example, if the used fluorine-based cleaning liquid contains organic contaminants, water-soluble contaminants, ionic contaminants, or solid contaminants, the regenerator must remove all these contaminants. For example, the regenerator described in Japanese Patent Laid-Open No. 2001-129302 can be connected to the cleaning device by a circulation pipe.

In the cleaning system, a buffer tank for temporarily storing a fluorine-based cleaning liquid is further provided between at least one of the purification device and the cleaning device and between the cleaning device and the regeneration device. Also good.
When a purification buffer tank is installed on the downstream side of the purification device, in parallel with the cleaning process by the cleaning device, the purified, unused fluorine-based cleaning solution is put into the purification buffer tank for the next batch cleaning process. Can be stored. Therefore, when the dirty used fluorine-based cleaning solution in the cleaning device is replaced with a new fluorine-based cleaning solution, or when the used fluorine-based cleaning solution is regenerated in the regenerator, the purified fluorine-based cleaning solution in the purification buffer tank is used. The cleaning liquid can be used for the next batch cleaning process, and the cleaning process can be performed efficiently.

In addition, when a regeneration buffer tank is provided on the upstream side of the regenerator, the used fluorine-based cleaning liquid is put into the regenerator buffer tank when the dirty spent fluorine-based cleaning liquid in the cleaning device is regenerated by the regenerator. While transporting, supply the purified fluorine-based cleaning solution from the purification device to the cleaning device, and supply the used fluorine-based cleaning solution from the regeneration buffer tank to the regeneration device during the cleaning process by the cleaning device to perform the regeneration process. Can do. If a second regeneration buffer tank is provided on the downstream side of the regenerator, the regenerated fluorine-based cleaning liquid is continuously sent to the second regeneration buffer tank and stored for the next cleaning batch. I can keep it.
Further, when both the purification and regeneration buffer tanks are provided, the above-described advantages of each buffer tank can be obtained, and the washing process can be performed more efficiently.

In the cleaning system of the present invention, the purification apparatus in which each of the contaminant removing apparatuses is continuously connected by piping and the cleaning apparatus are connected and integrated by piping, thereby continuously from the unused fluorine-based cleaning liquid. In addition, a high-purity fluorine-based cleaning liquid that has been purified by removing various contaminants can be directly supplied to the cleaning apparatus without being brought into contact with the external environment.
In this cleaning system, for example, a pump-type or air-type transfer means may be provided in the middle of the pipe so that the transfer of the fluorine-based cleaning liquid is not delayed, or the fluorine-based cleaning liquid is transferred by a gravity difference. Also good.

(Description of cleaning method)
The cleaning method of the present invention, in which the electronic component is cleaned by the cleaning system configured as described above, is a cleaning liquid regeneration step in which the fluorine-based cleaning liquid discharged from the cleaning apparatus is regenerated by the regenerating apparatus and circulated to the cleaning apparatus May further be included.
Moreover, you may include the washing | cleaning liquid replenishment process which replenishes the refine | purified fluorine-type washing | cleaning liquid from a refiner | purifier to a washing | cleaning apparatus.
In the cleaning process, the electronic component is immersed and cleaned in the fluorine-based cleaning liquid in the cleaning tank, the cleaned electronic component is immersed in the fluorine-based cleaning liquid in the rinsing tank and rinsed, and the rinsed electronic component is vaporized. The electronic component that has been subjected to vapor cleaning with the vapor in the staying portion and then subjected to vapor cleaning may be subjected to shower cleaning with a purified fluorine-based cleaning liquid from a shower nozzle.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited to what was illustrated below.

(Embodiment 1)
FIG. 1 is a schematic configuration diagram showing Embodiment 1 of the cleaning system of the present invention.
The cleaning system according to the first embodiment includes a cleaning device 10 and a purification device 20 connected to the cleaning device 10 by piping.

The cleaning device 10 includes a body 11 having an upper opening shape, a cleaning tank 12 and a rinsing tank 13 disposed in a lower portion of the body 11, and a vapor condensing unit 14 disposed along an upper opening edge of the body 11. The fluorine-based cleaning liquid C is accommodated in the cleaning tank 12 and the rinsing tank 13. In FIG. 1, the alternate long and two short dashes line represents the liquid level of the fluorine-based cleaning liquid C, and the fluorine-based cleaning liquid C is an amount in which the liquid level of the cleaning tank 12 is always lower than the liquid level of the rinsing tank 13. ing.

The cleaning tank 12 has a heater 12a on the inner bottom surface, and the fluorine-based cleaning liquid C in the cleaning tank 12 is heated by the heater 12a. Further, a part of the heated fluorine-based cleaning liquid C in the cleaning tank 12 rises as vapor, and a vapor layer S of the fluorine-based cleaning liquid C is formed above the cleaning tank 12 and the rinsing tank 13. In FIG. 1, the dotted line represents the boundary between the vapor layer S and the outside air.
The rinsing tank 13 has an ultrasonic generator 13a on the inner bottom surface, and ultrasonic waves are applied to the fluorine-based cleaning liquid C in the rinsing tank 13 by the ultrasonic generator 13a.

The vapor condensing unit 14 includes a condensing tube 14a provided along the inner surface of the upper opening edge of the body 11, a cooling cycle unit (not shown) that circulates the refrigerant in the condensing tube 14a, and a soot provided under the condensing tube 14a. The water separator 14c which connects the part 14b, the collar part 14b, and the rinse tank 13 through piping is provided.
A part of the vapor in the vapor layer S comes into contact with the condenser tube 14 and is deprived of heat to be liquefied and collected in the flange 14b. Since the liquefied fluorine-based cleaning liquid C contains moisture condensed from water vapor in the air, the fluorine-based cleaning liquid C is introduced into the water separator 14c from the flange 14b and separated from the water, and the fluorine-based cleaning liquid C Water having a smaller specific gravity than the water separator 14c is discharged to the outside from the drain outlet at the top of the water separator 14c, and the fluorine-based cleaning liquid C is introduced into the rinsing tank 13 through the piping from the opening at the bottom of the water separator 14c.

The purification device 20 constitutes a water contact column 21 constituting a water washing device for removing water-soluble contaminants, a water separator 22 and a hygroscopic material column 23 constituting a water removal device, and an ionic contaminant removal device. An ionic contaminant removal column 24, a heater built-in distillation column 25 constituting a rectifying device for removing organic contaminants, and a filter device 26 for removing solid contaminants are arranged in this order from the upstream side. Are connected in series.
The water contact column 21 has a cleaning liquid inlet and a water outlet at the upper upstream end, and has a cleaning liquid outlet and a water inlet at the lower downstream end. The cleaning liquid inlet is an unused fluorine-based cleaning liquid C. Is connected to the hopper 21a for introducing the water into the inside through a pipe, and the water inlet is connected to a water supply source (not shown) through the pipe.
The filter device 26 is connected to the rinsing tank 13 of the cleaning device 10 by piping.

The cleaning method using this cleaning system includes a purification process in which an unused fluorine-based cleaning liquid is supplied to the purification apparatus 20 for purification, and a cleaning process in which electronic components are cleaned with the fluorine-based cleaning liquid C in the cleaning apparatus 10. In addition, the purified fluorine-based cleaning liquid C is supplied to the cleaning device 10 before cleaning the electronic components in the cleaning device 10.

<About the purification process>
In the water contact column 21, the fluorine-based cleaning liquid flows from above and water flows from below. When water-soluble contaminants are contained in the fluorine-based cleaning liquid, the water-soluble contaminants are removed while the fluorine-based cleaning liquid descends, and then sent to the water separator 22. In addition, water used for the treatment is discharged from the upper part of the water contact column 21.
Since the fluorine-based cleaning liquid sent to the water separator 22 contains a slight amount of water, the fluorine-based cleaning liquid and water are separated into a lower layer and an upper layer in the water separator 22, and the lower-layer fluorine-based cleaning liquid becomes a hygroscopic material. Sent to column 23. The separated water is discharged from the upper part of the water separator 22.
Since the fluorine-based cleaning liquid sent to the hygroscopic material column 23 contains a small amount of moisture, the moisture is removed by the hygroscopic material (for example, zeolite), and then the fluorine-based cleaning liquid is transferred to the ionic contaminant removal column 24. Sent.

When ionic contaminants are contained in the fluorine-based cleaning liquid sent to the ionic contaminant removal column 24, the ionic contaminant removal material (for example, alumina gel) is used in the ionic contaminant removal column 24. The ionic contaminants are removed, and then the fluorine-based cleaning liquid is sent to the distillation tower 25.
When organic contaminants are contained in the fluorine-based cleaning liquid sent to the distillation column 25, the organic property is obtained by distillation operation in the distillation column 25 using the boiling point difference between the organic contaminants and the fluorine-based cleaning liquid. Contaminants are removed, and then the fluorine-based cleaning liquid is sent to the filter device 26.
When solid contaminants are contained in the fluorine-based cleaning liquid sent to the filter device 26, the solid contaminants are removed by the filter device 26 having a microfiltration membrane, an ultrafiltration membrane, or the like. The solid contaminant may include a hygroscopic material or an ionic contaminant removing material that has flowed from the upstream side.

Thus, the fluorine-based cleaning liquid that has passed through the water contact column 21, the water separator 22, the hygroscopic material column 23, the ionic contaminant removal column 24, the distillation tower 25, and the filter device 26 is water-soluble, ionic, organic, The fluorine-based cleaning liquid C is purified to a high purity and does not contain various solid contaminants, and is sent to the rinsing tank 13 of the cleaning apparatus 10.
That is, when cleaning an electronic component using a brand new fluorine-based cleaning liquid, the purified fluorine-based cleaning liquid C is supplied into the empty rinsing tank 13 of the cleaning apparatus 10 and the fluorine-based cleaning liquid C overflowing from the rinsing tank 13 is supplied. Is supplied to the washing tank 12.

<About the cleaning process>
In the cleaning process, first, the electronic component is immersed in the heated fluorine-based cleaning liquid C in the cleaning tank 12 to remove dirt (mainly organic contaminants) on the surface of the electronic component.
Next, the electronic component is immersed in the fluorine-based cleaning liquid C in the rinsing tank 13. Since the fluorine-based cleaning liquid C in the rinsing tank 13 is maintained at a lower temperature than the fluorine-based cleaning liquid C in the cleaning tank 12, the electronic components are cooled in the rinsing tank 13. Further, in the rinsing tank 13, since ultrasonic waves are applied to the fluorine-based cleaning liquid C by the ultrasonic generator 13 a, dirt remaining on the surface of the electronic component without being removed in the cleaning tank 12 is ultrasonic. Is removed from the electronic component by the action of and removed.

Thereafter, the electronic component is pulled up from the rinsing tank 13 and introduced into the vapor layer S, and finally rinsed with a fluorine-based cleaning liquid that condenses and liquefies on the surface of the electronic component, and is taken out from the upper opening of the cleaning device 10. It is.
During the cleaning process, the clean fluorine-based cleaning liquid condensed into the condensing unit 14 is separated into water and then returned to the rinsing tank 13, and contaminants brought into the rinsing tank 13 accompanying the electronic components from the cleaning tank 12 are It is returned to the washing tank 12 by overflow.
In this cleaning step, the electronic component can be cleaned using a fluorine-based cleaning liquid in which the purity of the unused fluorine-based cleaning liquid is further increased, so that the cleanliness of the electronic component can be further improved.

In this cleaning system, when the internal fluorine-based cleaning liquid C is reduced by repeating the cleaning process of the electronic component by the cleaning device 10, the purified fluorine-based cleaning liquid is supplied to the rinsing tank 13 during and / or after cleaning. Can be replenished.
Further, in the present cleaning system, after a predetermined number of electronic components are cleaned (one batch cleaning process) in the cleaning device 10, it is necessary to replace the dirty fluorine-based cleaning liquid C in the cleaning device 10.
In this case, a valve of a discharge port (not shown) provided at the bottom of the cleaning tank 12 and the rinsing tank 13 is opened to collect the used fluorine-based cleaning liquid in a recovery container, and if necessary, the cleaning apparatus 10 is emptied. Is washed with the fluorine-based cleaning liquid C purified by the purification apparatus 20 and the discharge port is closed, and then the fluorine-based cleaning liquid C purified by the purification apparatus 20 as described above is introduced into the rinsing tank 13 and the cleaning tank 12. .
The recovered used fluorine-based cleaning liquid may be discarded or regenerated in a regenerator, and the regenerated fluorine-based cleaning liquid may be directly put into the cleaning apparatus 10 to be reused or purified. After the purity is further increased by the apparatus, it may be put into the cleaning apparatus 10 and reused.

(Embodiment 2)
FIG. 2 is a schematic configuration diagram showing Embodiment 2 of the cleaning system of the present invention.
As in the first embodiment, the cleaning system according to the second embodiment includes the cleaning device 100 and the purification device 200 connected to the cleaning device 100 through a pipe. The configurations of the cleaning device 100 and the purification device 200 are as follows. Is slightly different from the first embodiment.
Hereinafter, differences from the first embodiment in the second embodiment will be mainly described.

The cleaning device 100 includes a body 110 having an upper opening shape, a cleaning tank 120 and a rinsing tank 130 disposed in a lower portion of the body 110, a vapor condensing unit 140 disposed along an upper opening edge of the body 110, and a cleaning A steam generation tank 150 disposed adjacent to the tank 120 and a distillation tower 160 disposed above the steam generation tank 150 are provided.
As in the first embodiment, the cleaning tank 120 includes a heater 120a, the rinsing tank 130 includes an ultrasonic generator 130a, and the vapor condensing unit 140 includes a condensing pipe 140a, a ridge 140b, and a water separator 140c. ing. In addition, you may provide an ultrasonic generator in the washing tank 120 instead of the heater 120a.

The steam generation tank 150 is provided outside the steam condensing unit 140, and has a heater 150a on the inner bottom surface.
The body 110 has a portion that covers the upper part of the steam generation tank 150, and the distillation tower 160 is mounted on this portion. The distillation tower 160 and the steam generation tank 150 communicate with each other through a communication hole formed in the body 110.
Further, a discharge port for discharging steam is formed at the upper end of the distillation column 160, and this discharge port communicates with the vicinity of the condensing pipe 140a of the steam condensing unit 140 through a pipe.

In the electronic component cleaning process by the cleaning apparatus 100 as in the first embodiment, the electronic component is first immersed and cleaned in the heated fluorine-based cleaning liquid C in the cleaning tank 120, and then in the rinsing tank 130. After immersing and rinsing in the fluorine-based cleaning liquid C to which ultrasonic waves are applied, the heated fluorine-based cleaning liquid C in the cleaning tank 120 is pulled up into the vaporized vapor layer S and steam-cleaned, and then externally. It is taken out.
During this time, the fluorine-based cleaning liquid C overflowing the cleaning tank 120 is introduced into the steam generation tank 150, and a part of the vapor of the fluorine-based cleaning liquid C heated and vaporized in the steam generation tank 150 passes through the distillation tower 160. By contacting the condenser tube 140a, it is liquefied and collected in the collar 140b. That is, in the cleaning process, the dirty fluorine-based cleaning liquid in the cleaning tank 120 flows into the steam generation tank 150, and the fluorine-based cleaning liquid containing organic contaminants is vaporized in the steam generation tank 160, and organic contaminants out of the vapor are included. The vapor is cooled and liquefied in the distillation column 160 and returned to the vapor generation tank 160, and only the fluorine-based cleaning solution vapor that does not contain organic contaminants passes through the distillation column 160 and is liquefied in the vapor condensing unit 140. At the same time, a part of the vapor in the vapor layer S is liquefied by the vapor condensing unit 140 and collected in the tub 140b, and a clean fluorine-based cleaning liquid is returned from the jar 140b to the rinsing tank 130 through the water separator 140c. .

In the purification apparatus 200, a water contact column 210 to which a hopper 210a is connected, a water separator 220, a moisture absorption column 230, an ionic contaminant removal column 240, and a filter device 260 are continuously connected in series by piping. The filter device 260 is connected to the rinsing tank 130 of the cleaning device 100 by piping. That is, the purification apparatus 200 is the same as that of Embodiment 1 except that the distillation column 25 (see FIG. 1) in the purification apparatus 20 of Embodiment 1 is omitted.

According to the cleaning system of the second embodiment, the purification apparatus 200 passes through removal of water-soluble contaminants other than organic contaminants in the unused fluorine-based cleaning liquid, removal of ionic contaminants, and removal of solid contaminants. The purified fluorine-based cleaning liquid is introduced into the rinsing tank 130 of the cleaning device 100, and the cleaning system 100 cleans the fluorine-based cleaning liquid containing organic contaminants while cleaning the electronic components by the distillation tower 160. It can be refluxed to the tank 130.

(Embodiment 3)
FIG. 3 is a schematic configuration diagram showing Embodiment 3 of the cleaning system of the present invention.
The cleaning system according to the third embodiment further includes a regenerator 30 that regenerates the used fluorine-based cleaning liquid in addition to the same cleaning apparatus 10 and purification apparatus 20 as those of the first embodiment described with reference to FIG. In FIG. 3, the same components as those in FIG. 1 are denoted by the same reference numerals.
Hereinafter, differences from the first embodiment in the third embodiment will be mainly described.

The regenerator 30 is connected to the cleaning tank 12 and the rinsing tank 13 of the cleaning apparatus 10 through a circulation pipe 31, and the dirty fluorine-based cleaning liquid in the cleaning tank 12 is introduced into the regenerator 30 and cleaned. The regenerated fluorine-based cleaning liquid is returned to the rinsing tank 13 and reused.
For example, after one batch of cleaning process is completed, the dirty fluorine-based cleaning liquid from the cleaning tank 12 is continuously transferred to the regenerator 30 for regeneration, and the regenerated cleaning composition liquid is subjected to the next batch cleaning process. It is continuously supplied to the rinsing tank 13 before starting.
In this cleaning system as well, when the internal fluorine-based cleaning liquid C is reduced by repeating the cleaning process of the electronic component by the cleaning device 10, the purified fluorine-based cleaning liquid is rinsed during and / or after cleaning. 13 may be replenished.

The regenerator 30 includes a plurality of contaminant removal devices that remove various contaminant components, for example, a water cleaning device, a moisture removal device, an ionic contaminant removal device, a rectification device, and a filter device similar to the purification device 20. It is preferable that a known reproducing apparatus can be used.
According to this cleaning system, the used dirty fluorine-based cleaning liquid is transferred from the cleaning device 10 to the regenerator 30 through the circulation pipe 31, and the regenerated fluorine-based cleaning liquid is transferred from the regenerator 30 through the circulation pipe 31 to the cleaning apparatus 10. Can be transferred to. As a result, in addition to being able to transfer the fluorine-based cleaning liquid easily and in a short time, the regenerated fluorine-based cleaning liquid can be transferred to the cleaning device 10 without contacting the external environment. The contamination inside can be avoided.

(Embodiment 4)
FIG. 4 is a schematic configuration diagram showing Embodiment 4 of the cleaning system of the present invention.
The cleaning system according to the fourth embodiment further includes a regeneration device 30 similar to that of the third embodiment in addition to the same cleaning device 100 and purification device 200 as those of the second embodiment described with reference to FIG. In FIG. 4, the same components as those in FIGS. 2 and 3 are denoted by the same reference numerals.
Similarly to the third embodiment, the cleaning system according to the fourth embodiment can regenerate the used and dirty fluorine-based cleaning liquid easily and with high purity in the system.

(Embodiment 5)
FIG. 5 is a schematic configuration diagram showing Embodiment 5 of the cleaning system of the present invention.
As shown in FIG. 5, the cleaning system of the fifth embodiment temporarily stores the purified fluorine-based cleaning liquid between the purification device 20 and the cleaning device 10 in the cleaning system of the third embodiment (see FIG. 3). A purification buffer tank 41 is provided, and a regeneration buffer tank 42 is provided between the downstream side of the regeneration device 30 and the cleaning device 10 to temporarily store the regenerated fluorine-based cleaning liquid.
According to the cleaning system of the fifth embodiment, the fluorine-based cleaning liquid C in the cleaning apparatus 10 is continuously transferred to the regeneration apparatus 30 and regenerated, and the regenerated fluorine-based cleaning liquid is continuously supplied to the regeneration buffer tank 42. In the meantime, the purified fluorine-based cleaning liquid in the purification buffer tank 41 can be continuously transferred to the cleaning device 10 to prepare for the next cleaning step.
In addition, the regenerated fluorine-based cleaning liquid in the regeneration buffer tank 42 is continuously transferred to the cleaning apparatus 10 while the fluorine-based cleaning liquid C in the cleaning apparatus 10 is continuously transferred to the regenerating apparatus 30 and regenerated. It is also possible to prepare for the next cleaning step. Therefore, it is possible to efficiently perform the cleaning process in batch units.
It is also possible to replenish the cleaning apparatus 10 with a part of the purified or regenerated fluorine-based cleaning liquid stored in the

buffer tanks

41 and 42 as needed.

The position of the purification buffer tank 41 is not limited to the position shown in the figure, and is between the distillation column 25 and the filter 26, between the ionic contaminant removal column 24 and the distillation column 25, and between the hygroscopic material column 23 and the ion. It may be between the toxic contaminant removal column 24 or before the water contact column 21. In this case, the fluorinated cleaning liquid during or before purification is temporarily stored in the purification buffer tank.
Further, the position of the regeneration buffer tank 42 may be between the upstream side of the regeneration device 30 and the cleaning device 10. In this case, the fluorinated cleaning liquid before regeneration is temporarily stored in the regeneration buffer tank 42.
In the fifth embodiment, the buffer tank may be either for purification or for regeneration.
Further, it goes without saying that such a configuration including the purification buffer tank 41 and / or the regeneration buffer tank 42 can be applied to the cleaning systems of Embodiments 1, 2, and 4 in addition to the cleaning system of Embodiment 3. Yes.

(Embodiment 6)
FIG. 6 is a schematic configuration diagram showing Embodiment 6 of the cleaning system of the present invention.
In the cleaning system of the sixth embodiment, the cleaning apparatus 10 further includes a shower nozzle 17 in addition to the same cleaning apparatus 10 and purification apparatus 20 as those of the third embodiment described with reference to FIG. 3, and the fluorine-based cleaning liquid purified by the purification apparatus 20. Is ejected from the shower nozzle 17 and the electronic component after the steam cleaning is configured to be shower cleaned. In FIG. 6, the same components as those in FIG. 3 are denoted by the same reference numerals.
Hereinafter, differences from the third embodiment in the sixth embodiment will be mainly described.

In the sixth embodiment, for example, the shower nozzle 17 is disposed near the upper edge of the body 11 near the cleaning tank 12 above the vapor retention portion S in the cleaning device 10, and the filter 26 and the cleaning device 10 of the purification device 20 are arranged. A branch pipe 28 that branches from the middle of the pipe 27 that connects the pipe 18 and the shower nozzle 17 is connected. Further, an open / close valve 28 a is provided in the middle of the branch pipe 28, and an open / close valve 27 a is provided downstream of the branch pipe 28 of the pipe 27.

With this configuration, during the cleaning process, the opening / closing valve 27a is closed, the opening / closing valve 28a is opened, the fluorine-based cleaning liquid purified by the purification device 20 is ejected from the shower nozzle 17, and the steam S in the steam retention part is used. It is possible to shower-wash the electronic component after being steam-washed. Further, the fluorine-based cleaning liquid subjected to shower cleaning can be dropped into the cleaning tank 12 and reused in the cleaning tank 12.
Therefore, even if the vapor S contains the organic contaminant vapor, and the organic contaminant remains on the surface of the electronic component after the vapor cleaning, the surface of the electronic component is removed by the purified shower-like fluorine-based cleaning liquid. Since the organic contaminants are washed away, the cleanliness of the electronic component can be further increased.
Needless to say, such a configuration that enables shower cleaning can be applied to the cleaning systems of the first, second, fourth, and fifth embodiments in addition to the cleaning system of the third embodiment.
In particular, it is preferable that the purified fluorine-based cleaning liquid can be supplied from the purification buffer tank 41 (see FIG. 5) to the shower nozzle 17 as needed.

(Embodiment 7)
FIG. 7 is a schematic configuration diagram showing Embodiment 7 of the cleaning system of the present invention.
The cleaning system of the seventh embodiment is the same as that of the first embodiment except that the cleaning device 10 in the cleaning system of the first embodiment described in FIG. 1 is different. In FIG. 7, the same components as those in FIG. 1 are denoted by the same reference numerals.
Hereinafter, differences from the first embodiment in the seventh embodiment will be mainly described.

The cleaning apparatus 10A according to the seventh embodiment includes a body 11 having an upper opening, a lid 11a that shields the upper opening of the body 11 so as to be openable and closable, The rinsing tank 13 is provided, and the fluorine-based cleaning liquid C is accommodated in the cleaning tank 12 and the rinsing tank 13. Note that the fluorine-based cleaning liquid C is set so that the liquid level in the cleaning tank 12 is always lower than the liquid level in the rinsing tank 13.
Further, the cleaning tank 12 and the rinsing tank 13 each have an ultrasonic generator 13 a on the inner bottom surface, and ultrasonic waves are generated in the cleaning liquid 12 in the cleaning tank 12 and the rinsing tank 13 by each ultrasonic generator 13 a. Is granted.

When the electronic device is cleaned by the cleaning device 10A, the lid 11a is opened. First, the electronic component is immersed in the fluorine-based cleaning liquid C in the cleaning tank 12 at room temperature, and the surface of the electronic component is ultrasonically cleaned. Peeled by action. Subsequently, the electronic component is immersed in the fluorine-based cleaning liquid C in the rinsing tank 13 at room temperature, and dirt remaining on the surface of the electronic component is peeled off by the action of ultrasonic waves, and then the upper opening of the cleaning device 10A. Is taken out more.
Thus, in the seventh embodiment, the steam cleaning performed in the first embodiment is omitted. The lid 11a is basically closed except for the electronic component cleaning step, and the cleaning apparatus 10A is hermetically sealed so that dust, dirt, dust, and the like do not enter the cleaning tank 13 and the rinsing tank 13.

(Embodiment 8)
FIG. 8 is a schematic configuration diagram showing Embodiment 8 of the cleaning system of the present invention.
The cleaning system of the eighth embodiment is the same as that of the seventh embodiment except that the cleaning device 10A in the cleaning system of the seventh embodiment described in FIG. 7 is different. In FIG. 8, the same components as those in FIG. 7 are denoted by the same reference numerals.
Hereinafter, differences from the seventh embodiment in the eighth embodiment will be mainly described.

The cleaning device 10B according to the eighth embodiment is obtained by providing the cleaning device 10A according to the seventh embodiment with a shower nozzle 17 (see FIG. 6). The shower nozzle 17 is connected to the purifier 20 as in the sixth embodiment.
When the electronic device is cleaned by the cleaning device 10B, the electronic component is cleaned in the cleaning tank 12 and the rinsing tank 13 in the same manner as in the seventh embodiment, and then the purified fluorine-based cleaning liquid C ejected from the shower nozzle 17 is used. And shower washed. Alternatively, shower cleaning may be performed after one or both of cleaning in the cleaning tank 12 and cleaning in the rinsing tank 13 are omitted. The shower cleaning may be high-pressure shower cleaning.

(Embodiment 9)
FIG. 9 is a schematic configuration diagram showing Embodiment 9 of the cleaning system of the present invention.
The cleaning system of the ninth embodiment is the same as that of the first embodiment except that the cleaning device 10 in the cleaning system of the first embodiment described in FIG. 1 is different. In FIG. 9, the same components as those in FIG. 1 are denoted by the same reference numerals.
Hereinafter, differences from the first embodiment in the ninth embodiment will be mainly described.

In the cleaning device 10C according to the ninth embodiment, the rinsing tank 13 of the cleaning device 10 according to the first embodiment is omitted.
When cleaning the electronic component by the cleaning device 10C, the electronic component is not immersed in the heated fluorine-based cleaning liquid C in the cleaning tank 12, but is cleaned in the vapor layer S. At this time, when the electronic component is brought into the vapor layer S in a cold state, the vapor of the cleaning liquid is condensed and liquefied on the component surface, thereby washing away the dirt on the component surface. After that, the temperature of the electronic component gradually increases and finally reaches the boiling point of the cleaning liquid by leaving it for a while, so that the cleaning liquid on the surface of the component is vaporized and the electronic component is dried. Note that the electronic component may be taken out from the vapor layer S and dried by natural drying or an external drying device before drying.

(Other embodiments)
1. In each of the embodiments described above, a circulation path for circulating the fluorine-based cleaning liquid in the rinsing tank of the cleaning device is provided, a filter is installed in the circulation path, and the fluorine-based cleaning liquid in the rinsing tank is passed through the filter to be circulated and cleaned. You may comprise so that it may become. According to this configuration, even if solid contaminants adhering to the electronic parts before cleaning are peeled off in the rinsing tank and mixed into the fluorinated cleaning liquid, the solid contaminants are removed from the fluorinated cleaning liquid in the rinsing tank. It is possible to increase the cleanliness of the electronic component.
2. The cleaning systems of Embodiment 2 (see FIG. 2) and Embodiment 4 (see FIG. 4) are provided with a distillation column 160 for removing organic contaminants from the used fluorine-based cleaning liquid. Although the distillation column is omitted from the apparatus 200, the purification apparatus 200 may be provided with a distillation column as in the first embodiment (see FIG. 1) and the third embodiment (see FIG. 3). By providing a distillation tower in the purification apparatus 200, it is possible to supply the cleaning apparatus 100 with a higher-purity unused fluorine-based cleaning liquid from which organic contaminants have been removed.
3. The cleaning systems of Embodiments 7 to 9 (FIGS. 7 to 9) may also include the regenerator 30 and the

buffer tanks

41 and 42 as in Embodiments 3 to 6 (FIGS. 3 to 6).

EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated in more detail, this invention is not limited to these Examples.
Example 1
Vertrel (registered trademark) XF (manufactured by Mitsui DuPont Fluoro Chemical Co., Ltd.) as a fluorine-based cleaning liquid, 200 ppm by weight of 2-propanol (hereinafter referred to as IPA) as a water-soluble contaminant, and Krytox as an organic contaminant (Registered trademark) 143AC (manufactured by DuPont) was mixed with 5 ppm by weight to prepare a fluorine-based cleaning solution having simulated dirt.
The fluorine-based cleaning liquid having simulated dirt is purified using the purification apparatus 20 in the first embodiment (see FIG. 1), and how much various contaminants and moisture are removed from the purified fluorine-based cleaning liquid. The results were measured using a moisture meter (CA-06 model, manufactured by Mitsubishi Chemical Corporation), and the results are shown in Table 1. In addition, the molecular sieve 3A (made by Union Carbide) was used for the ionic contaminant removal apparatus 24, and the distillation tower (Oldershaw type, 40 stages) was used for the rectification apparatus 25. FIG.

From the results of Example 1, it was confirmed that a high-purity fluorine-based cleaning liquid can be obtained by purifying the fluorine-based cleaning liquid having simulated dirt with the purification apparatus of the present invention.

(Example 2)
First, what kind of contaminants are contained in the unused fluorine-based cleaning liquid used in the cleaning system of the present invention, and then the unused fluorine-based cleaning liquid is purified in the same manner as in Example 1, The extent to which various contaminants were removed from the purified fluorine-based cleaning solution was measured in the same manner as in Example 1, and the results are shown in Table 2.
In addition, as the unused fluorine-based cleaning liquid, the Bertrell XF (registered trademark) contained in an 18 L steel can was used.

From the results of Example 2, a plurality of types of contaminants are also contained in the unused fluorine-based cleaning liquid, and a higher-purity fluorine-based cleaning liquid can be obtained by purifying the fluorine-based cleaning liquid with a purification apparatus. I was able to confirm.

The electronic component cleaning method and cleaning system of the present invention are not limited to electronic components, but cut silicon wafers, ceramic wafers, and silicon wafers that require high cleaning with a high-purity fluorine-based cleaning solution. Particularly suitable for cleaning electronic components such as silicon chips, ceramic chips obtained by cutting the ceramic wafer, glass substrates, metal substrates, color filter substrates, printed circuit boards and electronic components using these, and are always highly clean. It becomes possible to use the fluorinated cleaning liquid for a long period of time.

Claims

A purification step of purifying an unused fluorine-containing organic detergent composition liquid by a purification device;
A cleaning step of cleaning the electronic component using the purified cleaning composition liquid supplied from the purification device into the cleaning device,
An electronic component cleaning method in which at least the organic contaminants are removed by a rectifying device and the solid contaminants are removed by a filter device in the purification step.
The purification step includes removal of water-soluble contaminants by a water washing device;
The purification process is performed in the order of organic contaminant removal, water-soluble contaminant removal, solid contaminant removal, or water-soluble contaminant removal, organic contaminant removal, solid contaminant removal. The method for cleaning an electronic component according to claim 1, wherein the cleaning method is performed to purify the cleaning composition liquid.
The electronic component includes a silicon wafer, a ceramic wafer, a silicon chip obtained by cutting the silicon wafer, a ceramic chip obtained by cutting the ceramic wafer, a glass substrate, a metal substrate, a color filter substrate, a printed circuit board, and an electronic component using these. The method for cleaning an electronic component according to claim 1.
The method for cleaning an electronic component according to claim 1, further comprising a regeneration step of regenerating the detergent composition liquid discharged from the cleaning device with a regeneration device and circulatingly supplying the cleaning composition liquid to the cleaning device.
2. The electronic component cleaning method according to claim 1, further comprising a replenishment step of replenishing the purified cleaning composition liquid from the purification device to the cleaning device.
A rinsing tank in which the cleaning device is supplied with the cleaning composition liquid purified by the purification device, a cleaning tank that receives and heats the cleaning composition liquid overflowing from the rinsing tank, and the cleaning tank A vapor retention part where the vapor of the cleaning agent composition heated and vaporized is retained, a vapor condensation part for condensing the vapor of the vapor retention part and returning it to the rinsing tank, and a cleaning purified by a purification device A shower nozzle for jetting the agent composition liquid,
In the cleaning step, the electronic component is immersed in the cleaning composition liquid in the cleaning tank for cleaning, and the cleaned electronic component is immersed in the cleaning composition liquid in the rinsing tank for rinsing and rinsing. The electronic component cleaning method according to claim 1, wherein the electronic component is subjected to steam cleaning with the steam in a steam retention portion, and the electronic component subjected to steam cleaning is shower cleaned with a cleaning agent composition liquid from the shower nozzle. .
A cleaning system for cleaning an electronic component by the cleaning method according to claim 1,
A purification device that removes and purifies contaminants contained in an unused fluorine-containing organic cleaning composition liquid, and a cleaning for cleaning electronic components using the cleaning composition liquid purified by the purification apparatus With the device,
The purification device includes at least a rectifying device for removing organic contaminants and a filter device for removing solid contaminants, and is configured to purify the cleaning composition liquid through the rectifying device and the filter device. Electronic component cleaning system.
The refining device further includes a water washing device for removing water-soluble contaminants and a water removing device for removing water, and the rectifying device, the water washing device, the water removing device, and the filter device in this order, or water The electronic component cleaning system according to claim 7, wherein the electronic component cleaning system is configured to purify through the cleaning composition liquid in the order of a cleaning device, a water removing device, a rectifying device, and a filter device.
The electronic component cleaning system according to claim 7, wherein the refining device further includes an ionic contaminant removing device for removing ionic contaminants.
The electronic component cleaning system according to claim 7, further comprising a regeneration device that regenerates the cleaning agent composition liquid used in the cleaning device and circulates and supplies it to the cleaning device.
A rinsing tank in which the cleaning device is supplied with the cleaning composition liquid purified by the purification device, a cleaning tank that receives and heats the cleaning composition liquid overflowing from the rinsing tank, and the cleaning tank A vapor retention part in which the vapor of the cleaning composition liquid heated and vaporized is retained, and a vapor condensation part for condensing the vapor in the vapor retention part and refluxing it to the rinsing tank,
In addition, the electronic component is immersed in the cleaning composition liquid in the cleaning tank for cleaning, and the cleaned electronic component is immersed in the cleaning composition liquid in the rinsing tank for rinsing and rinsing. The component is configured to be subjected to steam cleaning with the steam in the steam retention part,
The electronic device cleaning system according to claim 7, wherein the regeneration device is configured to regenerate the cleaning composition liquid discharged from the cleaning tank and circulate and supply the liquid to the rinsing tank.
The buffer tank which temporarily stores a cleaning composition liquid is further provided in at least one between the said refinement | purification apparatus and the said washing | cleaning apparatus, and between the said washing | cleaning apparatus and the said regeneration apparatus. Electronic component cleaning system.
The cleaning device further includes a shower nozzle, and is configured to eject the cleaning composition liquid purified by the purification device from the shower nozzle to shower-wash the electronic component after the steam cleaning. The electronic component cleaning system according to 11.