JPH07927A - Cleaner - Google Patents

Abstract

PURPOSE:To provide a cleaner capable of excellently cleaning the intricate part, with the consumption of a cleaning soln. reduced and capable of easily recovering harmful material and valuable material. CONSTITUTION:This cleaner consists of a cleaning tank 1, a transfer device (rollers 22 and 23) for introducing a material 6 to be treated into the tank 1 and discharging it, a spray nozzle 3 for injecting an atomized soln. 30 consisting of a mixture of liq. and gas against the material 6 in the tank 1 and an exhauster 4 connected to the tank 1, and a mist catcher 42 is preferably furnished to the exhauster 4. This device shows specific effect on the cleaning of a printed circuit board after plating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning device used for cleaning a printed wiring board or the like.

[0002]

2. Description of the Related Art Conventionally, for example, when cleaning a printed wiring board plated with metal, an immersion type cleaning device 9 as shown in FIG. 6 has been used. That is, the cleaning device 9 continuously transfers the long film-shaped printed wiring board 8 into the cleaning water 90 for cleaning contained in the tank 91. The printed wiring board 8 is transferred by rollers 93, 94 and 95 which are transfer devices. The printed wiring board 8 is immersed in cleaning water 90,
To be washed. Although not shown, there is also a method of injecting a water droplet shower into the printed wiring board 8 instead of the immersion method.

[0003]

However, the conventional cleaning device described above has the following problems. That is, first, in the case of the former immersion type cleaning device, the cleaning water 90 in the cleaning tank 91 is contaminated with the lapse of time due to the plating liquid adhering to the printed wiring board 8. As a result, the cleaning ability is reduced and the productivity is also reduced.

Therefore, it is necessary to replace the cleaning water 90 in the cleaning tank 91. For example, in the case of cleaning the printed wiring board 8 after the metal plating, it is necessary to replace the total amount of cleaning water of about 50 liters every 8 hours. Furthermore,
It is also necessary to control the degree of contamination of the wash water. On the other hand, as a solution to the above problem, it is possible to continuously supply and discharge a fixed amount of water in the cleaning tank 91. However, in this case, a large amount of water is required. Also in this case, the above pollution control is necessary.

Further, in any of the above cases, a small amount of the washed and removed plating solution is mixed in a large amount of water. Therefore, if a harmful substance such as a cyanide component in the plating liquid or an expensive substance such as gold (Au) or nickel (Ni) in the plating liquid is to be recovered, a great cost is required for the recovery. Further, in the case of this immersion type, since the printed wiring board only passes through the washing water, it is possible to sufficiently remove the plating liquid adhering to the details such as between the patterns of the printed wiring board and the through holes. However, cleaning may be insufficient.

Further, in the case of the above water drop shower system,
Although the shower water is poured onto the printed wiring board at one or two places, the injected washing water immediately drops and the contact time between the surface of the printed wiring board and the washing water is short. Therefore, cleaning may be insufficient. Therefore, if a large amount of cleaning water is used, a large amount of cleaning water is required as in the case of the above immersion type. Further, similarly, a great amount of cost is required to recover the harmful substances and the expensive substances.
Further, in the printed wiring board, there is a possibility that insufficient cleaning may occur in details as described above.

The same applies to objects to be cleaned other than the printed wiring board. In view of the above conventional problems, the present invention is to provide a cleaning device which is excellent in cleaning properties in detail, uses a small amount of cleaning liquid, and can easily collect harmful substances and expensive substances.

[0008]

According to the present invention, there is provided a cleaning tank, a transfer device for feeding and discharging an object to be cleaned into the cleaning tank, and a mixture of liquid and gas toward the object to be cleaned in the cleaning tank. A cleaning device comprising: a spray nozzle for spraying the atomized spray liquid and an exhaust device connected to the cleaning tank.

What is most noticeable in the present invention is that the spray nozzle is provided in the cleaning tank, and an exhaust device for discharging the gas in the spray liquid is connected to the cleaning tank. The atomizing nozzle injects an atomized atomizing liquid composed of a mixture of liquid and gas. Examples of the liquid include water or a liquid containing a detergent, a cleaning chemical or the like and a liquid such as water or alcohol. The gas includes high pressure air, nitrogen gas, carbon dioxide gas, and the like.

The liquid is integrally mixed with the high-pressure gas in the spray nozzle and jetted as a mist-like spray liquid by the pressure of the high-pressure gas. The pressure during this injection is preferably 1 to 4 kg / cm ² . 1 kg
If it is less than / cm ² , cleaning may be insufficient in the details such as in the small holes and small grooves. On the other hand, 4 kg / cm ²
Then, the spray force of the spray liquid is too strong, which may cause damage such as bending of the object to be cleaned.

In the case of cleaning a printed wiring board having details such as through holes, wiring patterns, small holes such as pads, and uneven portions, the above pressure is ^{2 to 4} kg / cm ^2.
It is preferable that As a result, the above details can be completely cleaned without damaging the printed wiring board.

Next, the exhaust device is for exhausting exhaust gas mainly consisting of gas components in the spray liquid injected into the cleaning tank. This exhaust device is connected to the side surface, top lid, etc. of the cleaning tank via an exhaust pipe.
It is preferable that the exhaust device is provided with a suction blower in order to efficiently discharge the gas components and efficiently perform cleaning with the spray liquid (FIG. 1).

Further, the exhaust device is preferably provided with a mist catcher for removing the mist mixed in the exhaust, that is, the fine particles of the liquid component in the spray liquid. As this mist catcher, a porous material such as felt or resin fiber is used. The mist catcher is installed between the washing tank and the suction blower.

Next, a waste liquid pipe is connected to the bottom of the cleaning tank, and the waste liquid pipe is sent to either the waste liquid outlet for exhausting the cleaning waste liquid or the recovery tank for collecting the cleaning waste liquid. It is preferable to provide a switching valve. As a result, the cleaning waste liquid can be collected or exhausted as needed. Further, it is preferable that a plurality of the spray nozzles are arranged toward the object to be cleaned. The spray nozzles are usually arranged on both the front side and the back side of the object to be cleaned.

Next, as the above-mentioned objects to be cleaned, there are semiconductors, liquid crystals, iron plates, etc. in addition to the above-mentioned printed wiring board. Further, the present invention is particularly effective when the object to be cleaned is a long film body such as a film printed wiring board, because the object can be continuously cleaned.

The present invention is particularly effective when the printed wiring board is subjected to metal plating and then the plating solution is washed. That is, in the case of cleaning the plating solution, it is necessary to collect harmful substances such as cyan in the plating solution or gold. However, as will be described later, in the case of the spray liquid cleaning according to the present invention, since the cleaning liquid amount may be small, the concentrations of the above-mentioned harmful substances and expensive substances such as gold and nickel in the cleaning waste liquid are high. Therefore, the collection of these becomes easy and the cost can be reduced significantly.

[0017]

In the present invention, the object to be cleaned is transferred into and out of the cleaning tank by the transfer device. And
In the cleaning tank, the spray liquid is sprayed from the spray nozzle onto the object to be cleaned. The spray liquid collides with the object to be cleaned and blows off the dirt on its surface. Further, the liquid in the spray liquid that has collided with the object to be cleaned adheres to the surface of the object to be cleaned and flows down to wash away the dirt on the surface. Further, the gas component in the spray liquid is discharged by the exhaust device with some liquid mist.

Therefore, even the details of the surface of the object to be cleaned can be cleaned extremely efficiently. On the other hand, in the conventional immersion type and shower type cleaning devices, the contact between the surface of the object to be cleaned and the cleaning liquid is static and not dynamic like the spray liquid of the present invention. That is, according to the present invention, since dynamic cleaning can be performed, even small details such as small holes and uneven grooves can be extremely effectively cleaned.

Further, since the cleaning is efficient, the amount of the cleaning liquid used can be extremely small. Therefore, the concentration of harmful substances and expensive substances in the cleaning waste liquid is also high. Therefore, the collection of these becomes easy and the cost of collection becomes low. Therefore, according to the present invention, it is possible to provide a cleaning device which is excellent in cleaning properties of details, uses a small amount of cleaning liquid, and can easily collect harmful substances and expensive substances.

[0020]

【Example】

Example 1 A cleaning apparatus according to an example of the present invention will be described with reference to FIGS. This example is an example of cleaning a long film-like printed wiring board as an object to be cleaned. As shown in FIGS. 1 to 3, the cleaning apparatus of the present example has cleaning tank 1 and rollers 21 to 23 as a transfer device for feeding and discharging the cleaning target 6 into the cleaning tank 1. Further, in the cleaning tank 1, there is provided a spray nozzle 3 for spraying a spray liquid 30 in the form of a mist composed of a mixture of liquid and gas toward the object to be cleaned 6. An exhaust pipe 41 of the exhaust device 4 is connected to the side surface of the cleaning tank 1.

Hereinafter, this will be described in detail. Cleaning tank 1 above
As shown in FIGS. 1 and 3, has an upper lid 11, and on both sides thereof, a roll 21 for feeding an article to be washed and a roll 23 for delivering an article to be washed. Further, the cleaning tank 1 has a guide roll 22 for guiding an object to be cleaned into the tank. Further, as shown in FIG. 1, a waste liquid pipe 15 is provided at the bottom of the cleaning tank 1, and the waste liquid pipe 15
In this case, a disposal port 150 for discarding the cleaning waste liquid 35 or a switching valve 14 for sending the cleaning waste liquid 35 to the recovery tank 5 is provided. A recovery pump 51 is provided between the switching valve 14 and the recovery tank 5.

In the exhaust device 4, a mist catcher 42 filled with felt is provided above the exhaust pipe 41, and the mist catcher 42 is connected to the suction blower 43. On the other hand, below the exhaust pipe 41, a drain pipe 46 for discharging the liquid collected by the mist catcher 42 is connected.

As shown in FIG. 4, the spray nozzle 3 has a housing 32, a liquid passage 33 provided therein, an air passage 34, an air passage opening 341, and a fan-shaped spray air hole 342. With the liquid injection port 33 in the center
It has a needle valve 35 for opening and closing 1. The rear end of the needle valve 35 is in contact with the injection amount adjusting knob 36. In the housing 32, the needle valve 35
In front of the piston 352, there is a pressure working chamber 363 communicating with the air passage 34.

The air passage 34 has an air pipe 321,
It communicates with the filter 324 via the compressor 323. On the other hand, the liquid passage 33 includes the liquid pipe 311,
It is connected to a water tank 313 via a liquid pump 312. Further, as shown in FIGS. 1 to 3, one spray nozzle 3 is provided on the side surface of the object to be cleaned and is arranged so that the spray liquid is sprayed on the upper and lower surfaces of the object to be cleaned.

Next, the function and effect will be described. First, the object to be cleaned 6 is fed into the cleaning tank 1 and delivered by the rolls 21 to 23 of the transfer device. Therefore, as shown in FIG. 4, the water 314 is sent into the liquid passage 33 of the spray nozzle 3 by the liquid pump 312. At the same time, high-pressure air is sent into the gas passage 34 of the spray nozzle 3 by the compressor 323.

The high-pressure air is jetted from the air passage opening 341 and the atomizing air hole 342 and enters the pressurizing working chamber 363. The high pressure air pushes the piston 352 behind the needle valve 35 backward. Therefore, the needle valve 35 retracts, the liquid injection port 331 is opened, and the water 314 is discharged.

At this time, the water 314 is mixed with the high-pressure air jetted from the air passage opening 341 and jetted as the spray liquid 30. In addition, the air holes 342 for spraying
The high-pressure air jetted from the atomizer further atomizes the liquid. The spray liquid 30 collides with the surface of the object 6 to be cleaned and blows off the plating liquid on the surface. Further, since the spray liquid strongly hits the inside of the through hole of the printed wiring board and the details such as the uneven portion of the circuit pattern, the cleaning is efficiently performed.

In the exhaust device, the exhaust blower 43 exhausts air through the exhaust pipe 41 connected to the side surface of the cleaning tank 1. Therefore, suction blower 4
In the direction of 3, the mixture of the high pressure air and some liquid mist is sucked. Then, this mist is collected by the mist catcher 42. The collected liquid falls and is discharged by the drain pipe 46.

In the present example, a film-shaped printed wiring board was used as the object to be cleaned, and this was sent into the cleaning tank 1 at a speed of 1 m / min, and the spray liquid 30 was sprayed onto it. The spray liquid has a spray pressure of about 3 kg at the spray nozzle.
Was / cm ² . The amount of water used for the spray liquid was 3 liter / hr. As a result, cleaning could be performed extremely efficiently and reliably. In addition, the cleaning of details such as the inside of the through-hole was perfect.

On the other hand, as a comparative example, when the immersion type was used, 40 liters of water was put in the washing tank, and this was replaced once every 8 hours. In this case, the amount of water required for cleaning the printed wiring board 100m was about 0.08 liter. On the other hand, in the case of the present example, the amount of water required for cleaning the printed wiring board 100m was about 0.05 liter, which was extremely small. Regarding the cleaning results, in the case of the above-mentioned comparative example, some insufficient cleaning was found in the details.

Further, in the case of the above-mentioned example, the amount of cyan in the recovered liquid was about 0.8 mg / liter,
In the case of the comparative example, it was extremely thin, about 0.01 mg / liter. As described above, according to this example, the fine cleaning property is excellent, the amount of the cleaning liquid used is small, and the harmful substances and expensive substances are easily recovered.

Embodiment 2 As shown in FIG. 5, the cleaning apparatus of this embodiment has an exhaust pipe 41 connected to the lid 11 above the cleaning tank 1. In addition, the spray nozzle 3 is used in the first embodiment in the first half of cleaning.
In the same manner as above, the object to be cleaned 6 was placed so that the spray liquid hits both sides. Further, in the latter stage of cleaning, the spray nozzle 381, so that the spray liquid hits both the front side and the back side of the object 6 to be cleaned.
382 was placed. According to this example, compared to the first embodiment,
Cleaning efficiency and exhaust efficiency are further improved. In addition, Example 1
The same effect as can be obtained.

[Brief description of drawings]

FIG. 1 is an overall explanatory diagram of a cleaning device according to a first embodiment.

FIG. 2 is a plan view of the cleaning device according to the first embodiment.

FIG. 3 is a side view of the cleaning device according to the first embodiment.

FIG. 4 is a sectional view of the spray nozzle according to the first embodiment.

FIG. 5 is an explanatory diagram of a cleaning device according to a second embodiment.

FIG. 6 is an explanatory view of a conventional cleaning device.

[Explanation of symbols]

 1. ． ． Wash tank, 15. ． ． Waste liquid pipe, 3. ． ． Spray nozzle, 30. ． ． Spray liquid, 32. ． ． Housing, 33. ． ． Liquid passage, 34. ． ． Air passage, 35. ． ． Needle valve, 4. ． ． Exhaust device, 42. ． ． Mist catcher, 5. ． ． Recovery tank,

Claims (7)

[Claims] 1. A cleaning tank, a transfer device for feeding and discharging an object to be cleaned into the cleaning tank, and an atomized state of a mixture of liquid and gas toward the object to be cleaned in the cleaning tank. A cleaning device comprising a spray nozzle for spraying a spray liquid and an exhaust device connected to the cleaning tank. 2. The cleaning device according to claim 1, wherein the exhaust device has a mist catcher for removing mist mixed in the exhaust gas. 3. The cleaning tank according to claim 1, wherein a waste liquid pipe is connected to a bottom portion of the cleaning tank, and the waste liquid pipe is provided with a waste liquid waste port for discarding the cleaning waste liquid or a recovery tank for collecting the cleaning waste liquid. A cleaning device having a switching valve for sending. 4. The cleaning device according to claim 1, wherein a plurality of spray nozzles are arranged toward the object to be cleaned. 5. The cleaning device according to claim 1, wherein the object to be cleaned is a long sheet which is continuously fed by a transfer device. 6. The cleaning device according to claim 1, wherein the object to be cleaned is a film-shaped printed wiring board. 7. The cleaning apparatus according to claim 1, wherein the spray liquid is water and air, and the spray pressure of the spray liquid at the spray nozzle is 0.3 to 4 kg / cm ² .