KR20100033485A - Method and apparatus for cleaning metal plate and spray nozzle for cleaning metal plate - Google Patents

Abstract

[PROBLEMS] To provide a method of cleaning a metal plate that is an inexpensive method of reduced environmental load not using any glycol and alcohol organic solvents, and that is capable of neatly cleaning even holes of printing pattern whose width is as very small as, for example, 0.22 or 0.14 mm, and provide a relevant cleaning apparatus and a gas/liquid spray nozzle for metal plate cleaning. [MEANS FOR SOLVING PROBLEMS] The cleaning method is for a metal plate (1) used to print a cream solder on a printed wiring board. The cleaning method comprises mixing an alkali water with compressed air in an alkali water spray nozzle (14) and, while atomizing the alkali water, spraying at high velocity the atomized alkali water from the alkali water spray nozzle (14) onto the metal plate (1) to thereby attain cleaning of the metal plate (1).

Description

METHOD AND APPARATUS FOR CLEANING METAL PLATE AND SPRAY NOZZLE FOR CLEANING METAL PLATE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cleaning a metal plate, a cleaning apparatus, and a metal plate cleaning used for printing cream soldering onto a printed wiring board. A jet nozzle for dragons.

Conventionally, cream soldering is applied to soldered portions of a printed wiring board, and cream soldering is printed by a screen printing method using a metal plate made of stainless steel, nickel, or the like. Is applied widely. However, in the case of printing the cream soldering by this screen printing method, since the solvent of the cream solder is volatilized by the change with time, since the cream soldering solidifies gradually, the printing work is being performed. While the cream soldering is solidified and deposited on the inner surface of the printing pattern hole of the metal plate, in particular, the inner surface of the hole end portion, the metal plate is clogged and the desired print quality is not obtained. A problem arises. For this reason, the metal plate used for printing is wash | cleaned every set time, and the solid substance of the cream soldering deposited on the inner surface of the hole is removed. As a washing apparatus of such a metal plate, the washing apparatus which sprays a washing | cleaning liquid at high pressure from a washing nozzle, and wash | cleans a metal plate (refer patent document 1), or Cleaning apparatus (for example, refer patent document 2) etc. which wash | clean a metal plate by vibrating a cleaning liquid with an ultrasonic vibrator are proposed.

In the cleaning apparatus described in Patent Document 1, a metal plate is attached to a holder and supported in a longitudinal direction, and both surfaces of the front and back surfaces of the metal plate are provided by a pair of cleaning nozzles. It is comprised so that a metal plate may be wash | cleaned by sliding a holder in the up-down direction, spraying a washing | cleaning liquid on it. In addition, the metal plate, the holder for supporting it, and the cleaning nozzle are entirely covered with a casing, and a rod-shaped partition plate is formed below the casing, and is sprayed from the cleaning nozzle. The cleaning liquid is configured to be recovered to a tank through the partition plate after cleaning the metal plate.

In the cleaning apparatus described in the patent document 2, the metal plate is disposed substantially parallel and at a slight interval from the longitudinal vibration plate with the ultrasonic vibrator, and the vibration plate is vibrated between the vibration plate and the metal plate by vibrating the vibration plate by the ultrasonic vibrator. It is configured to ultrasonically clean the metal plate by flowing down the cleaning liquid.

On the other hand, electrolysis of water or an aqueous electrolyte solution is performed to produce electrolytic alkaline water having a hydrogen ion index of pH 9 or more and pH 12 or less, which is pressurized to increase mechanical parts and electricity. A cleaning apparatus for cleaning a cleaning object by spraying the cleaning object onto a cleaning object such as a part, an automobile, an outer wall of a building, and a surface of a civil engineering structure is proposed (see Patent Document 3, for example).

In addition, a cleaning apparatus for removing contaminants adhering on the surface of a substrate, comprising: a spray nozzle for ejecting droplets toward a substrate; and a spray nozzle connected to the spray nozzle and having pure water in the spray nozzle. Liquid supply means for supplying a liquid such as water, gas supply means connected to the injection nozzle and supplying gas into the injection nozzle, and installed in the injection nozzle; It is proposed to have a mixing means for mixing a liquid and a gas supplied therein to change the liquid into droplets (see Patent Document 4, for example).

Patent Document 1: Japanese Patent Application Laid-Open No. 10-71705

Patent Document 2: Japanese Patent Application Laid-Open No. 2000-107711

Patent Document 3: Japanese Patent Application Laid-Open No. 2001-327934

Patent Document 4: Japanese Patent Application Laid-Open No. 8-318181

(Task to be solved)

By the way, in the washing apparatus described in the patent document 1, since a large amount of a glycol-based or alcohol-based organic solvent is sprayed from the washing nozzle, the running cost is not only high, but also the drainage. (Iii) had to be treated as industrial waste, so there was a problem that the load on the environment was very high. In addition, since the organic solvent is accompanied by a strong odor, the load on the body of the worker is not small, and there is a demand for improvement of the working environment. On the other hand, in the washing apparatus described in patent document 2, although the washing liquid to be used can be drastically reduced, as a washing | cleaning liquid, the organic solvent of a glycol type or alcohol type like a washing | cleaning apparatus described in patent document 1 is used. There is a problem in that the load on the environment is increased because it needs to be used, and also drainage must be treated as industrial waste.

In addition, as a method for cleaning a metal plate, in addition to the methods described in Patent Documents 1 and 2, a method of drying by wiping dry cloth, etc. dipped in a solvent, or blowing off using an air gun, Absorption by a suction nozzle is also used, but in recent years, the pitch of printed wiring boards has become very narrow, so that the holes of the printed pattern of metal plates are also 0.22 mm wide or 0.14. Since it is very narrow like mm width, it is difficult to completely remove the soldering which remains in the hole of a printing pattern by these washing | cleaning methods.

On the other hand, as described in Patent Literature 3, a washing method using electrolytic alkaline water, or as described in Patent Literature 4 is mixed with a liquid cleaning liquid such as air and pure water in the nozzle and a high-speed droplet is removed from the nozzle. The cleaning method by spraying and cleaning has not yet been adopted as the cleaning method of the metal plate, and a cleaning method capable of effectively and efficiently cleaning a metal plate having a printing pattern hole of 0.22 mm width or 0.14 mm width is still established. What is not is the current state.

Moreover, this inventor wash | cleans as described in patent documents 1 and 2 using the organic solvent, when wash | cleaning a metal plate using water-based washing | cleaning liquids, such as electrolytic alkali water and pure water, described in patent document 3, 4 In order to prevent reattachment of the cleaned soldering balls in the same manner as in the method, when the metal plates are washed in order from the upper side with the metal plate in the vertical direction, the cleaning defect occurs as it proceeds to the lower side of the metal plate. I found out that there is. And as a result of earnestly examining the cause, in the washing | cleaning method of patent documents 1 and 2, since the flux of cream soldering melt | dissolves in the organic solvent, even if the organic solvent after washing | cleaning moves to the lower side along a metal plate, it is a problem. However, it was found that the flux absorbs the washing water and solidifies when the cleaning liquids such as electrolytic alkaline water and pure water described in Patent Documents 3 and 4 are used, resulting in poor washing.

An object of the present invention is to provide a low-cost and low-cost cleaning method without using a glycol- or alcohol-based organic solvent, and to cleanly clean very narrow printed pattern holes such as 0.22mm width or 0.14mm width. To provide a metal plate cleaning method, a cleaning apparatus and a spray nozzle for cleaning the metal plate.

(Solution solution)

MEANS TO SOLVE THE PROBLEM This inventor has the ability to saponify and disperse an oil component with alkaline water, and has the property which is easy to micronize compared with ion-exchange water or an organic solvent, and waste liquid loads on an environment. By focusing on the fact that alkaline water is finely granulated to a smaller diameter than the printing pattern hole of the metal plate and spraying the metal plate at high speed, the fine particles of the alkaline water directly collide with the soldering attached to the hole of the printing pattern, The idea that the metal plate can be cleaned effectively and efficiently has been achieved to complete the present invention.

The cleaning method of the metal plate which concerns on this invention is a cleaning method of the metal plate used for printing cream soldering on a printed wiring board, Alkaline water ( Alkali water and compressed air are mixed in a jet nozzle to finely granulate the alkaline water, and the finely granulated alkaline water is jetted from the jet nozzle toward the metal plate at high speed. ) To clean the metal plate.

In the present invention, alkaline water means water having a pH of 7.5 or more made of alkaline water, alkaline electrolytic water or alkaline ionized water.

In this washing method, the alkaline granulated water is sprayed from the jet nozzle to the metal plate in a state in which the alkaline nozzle and the compressed air are mixed in the jet nozzle and granulated to a size that can pass through the holes of the printed pattern. Soldering balls or fluxes can be removed efficiently and efficiently by colliding with soldering balls or fluxes inside the printed pattern without energy loss. In addition, since alkaline water has the ability to saponify and disperse oil components, it has the effect of saponifying and dispersing the flux so that it is easy to clean. Thus, the flux adhering to the metal plate and the flux in the hole of the printing pattern are more efficient. It is removed cleanly. In addition, because only alkaline water is used to clean organic solvents, the waste liquid after cleaning does not need to be treated as industrial waste, which significantly reduces the load on the environment. It can be improved. In addition, since alkaline water is not volatile like organic solvents, it is not necessary to always replenish, and since running water is enough to wash and dry after washing, the running cost is also low. In addition, alkaline water has a property that it is more likely to be finer than ion-exchanged water or an organic solvent as described above, and can be finely granulated to a diameter smaller than a hole of a very narrow printing pattern such as 0.22 mm width or 0.14 mm width. Therefore, soldering and flux in the hole can be efficiently removed.

Here, while maintaining the metal plate at a constant angle to the horizontal direction, while spraying alkaline water from the jet nozzle toward the metal plate, the jet nozzle is reciprocated in the horizontal direction to move the metal plate in order from the bottom side. Priming cleaning is a preferred embodiment. In this case, since the metal plate is washed while being supported at a constant angle with the horizontal direction, the alkaline water injected into the metal plate flows downward along the metal plate, but since the metal plate is first cleaned from the bottom side in order. Even when alkaline water, which is an aqueous cleaning liquid, is used, the alkaline water sprayed onto the metal plate flows down along the completed portion of the metal plate, and the flux soldering flux attached to the metal plate absorbs the alkaline water. The cleaning failure due to solidification can be effectively prevented, and the metal plate can be cleaned cleanly.

After the initial cleaning, it is also a preferred embodiment to finish-clean the metal plate in order from the upper side by reciprocating the spray nozzle in the horizontal direction while spraying alkaline water from the injection nozzle toward the metal plate. In this way, when the final cleaning is performed in order from the upper side, even when a part of the cream soldering is reattached to the metal plate in the initial cleaning, this can be cleaned cleanly.

In the initial cleaning, alkaline water is sequentially sprayed into the forming range of the printing pattern of the metal plate to perform the initial cleaning, and in the final cleaning, alkaline water is sequentially sprayed onto the entire surface of the metal plate. Final cleaning is also a preferred embodiment. This structure can shorten the washing time by initial washing much and can shorten washing time as a whole. In addition, regarding the formation range of the most important printing pattern of a metal plate, cream soldering can be cleaned cleanly by two washing | cleaning.

It is also a preferred embodiment to supply the alkaline water to the jet nozzle while heating the alkaline water to 30 ° C to 60 ° C. The temperature of the alkali electrolytic water supplied to the injection nozzle is preferably set at 30 ° C or higher in consideration of the improvement of the cleaning power by softening the flux of the cream soldering. Therefore, it is preferable to set it to 30 to 60 degreeC.

In the above washing method, it is a preferred embodiment to set the hydrogen ion index of the alkaline water to pH = 10.5 to 12.0. In other words, if the pH is too high, the metal parts of the soldering or metal plate are corroded, and if the pH is too low, a long time cleaning is required, and it is undesirable to consider drainage treatment or running coast, so the pH is set to 10.5 or more and 12.0 or less. It is desirable to.

It is also a preferred embodiment to set the volume ratio of the compressed air and the alkaline water to 500: 1 to 700: 1. In other words, when the volume ratio of the compressed air is large, sufficient cleaning power is not obtained because the amount of alkaline water that collides with the soldering is not obtained. In order to completely remove the soldering and flux from the printing pattern, a long time cleaning is required. In addition, when the volume ratio of compressed air is too small, the alkaline water cannot be sufficiently granulated, and in very narrow widths such as 0.22 mm width or 0.14 mm width, the particles of alkaline water cannot escape through the holes of the printing pattern. Sufficient cleaning effect cannot be obtained. Similarly, when the volume ratio of the compressed air is too small, the phenomenon that the injected alkaline water forms a water film on the surface of the metal plate prevents the collision of new particles, thereby reducing the cleaning effect.

It is also a preferred embodiment to set the distance between the tip of the injection nozzle and the metal plate to 3 mm to 8 mm. If the distance between the tip of the injection nozzle and the metal plate is too long, the collision energy of alkaline water cannot be sufficiently applied to the cream soldering attached to the metal plate, and if it is too short, the alkaline water will not be sufficiently refined and will collide with the metal plate. In addition, since the spraying alkaline water collides with the alkaline water splashed from the metal plate, the cleaning efficiency is lowered. Therefore, the distance between the tip of the spray nozzle and the metal plate is preferably set to 3 mm to 8 mm.

The cleaning apparatus for a metal plate according to the present invention is a cleaning apparatus for a metal plate used for printing cream soldering on a printed wiring board, wherein the alkaline water supply means for pressurizing and supplying alkaline water ( Washing apparatus main body which sequentially washes the metal plate using alkaline water, compressed air supply means for supplying compressed air, and alkaline water and compressed air supplied from the both supply means. [0018] An injection nozzle capable of injecting alkaline water and compressed air supplied from the two supply means and injecting the alkaline water into a fine grain, and the injection nozzle are made of metal. A moving means for relatively moving along the plate, and finely divided alkaline water is discharged from the spray nozzle. While towards the injection plate at a high speed, but by a relative movement of the injection nozzle by moving means along the metal plate with the cleaning device main unit for cleaning a metal plate in sequence (洗淨 裝置 本體).

In this washing apparatus, the alkaline water supplied from the alkaline water supply means and the compressed air supplied from the compressed air supply means are mixed in the injection nozzle, and the alkaline water granulated from the injection nozzle is sprayed at a high speed toward the metal plate, thereby producing the metal. Since the plate is cleaned, the same effect as the above cleaning method is obtained.

Here, the alkaline water supply means includes soft water generating means for generating soft water from tap water, and alkaline water generating means for generating alkaline water from soft water produced by the soft water generating means. It is a preferred embodiment to use those having an alkaline water pressurizing means for pressurizing the alkaline water generated by the alkaline water generating means and the alkaline water generating means. Although commercially available alkaline water can be pressurized and supplied, since it is necessary to stock a large amount of alkaline water, it is preferable to comprise so that alkaline water may be produced from tap water like this invention.

The alkaline water supply means includes a storage tank for storing neutral water having a salt concentration set to a constant concentration, and alkaline electrolytic water (alkali) using neutral water in the storage tank. Alkaline water generator for generating alkaline water consisting of electrolysis water and strong acid water, a by-product thereof, and alkaline water for pressurizing and supplying alkaline water produced in the alkaline water generator to the injection nozzle. Alkaline water is supplied from the alkaline water generator, the alkaline water supplied from the alkaline water generator and used as the cleaning liquid in the washing machine main body, and neutralized by mixing strong acidic water produced by the alkaline water generator. A neutral tank is provided, and the neutral water generated in the neutral tank is returned to the water storage tank. Therefore, it is a preferred embodiment to reuse alkaline water after use as a washing liquid as neutral water.

In this washing apparatus, alkaline water and strong acidic water consisting of alkaline electrolyzed water are generated by the alkaline water generator using the neutral water stored in the water storage tank, and the generated alkaline water is supplied to the washing machine main body, and the alkaline water is used to remove metal plates or the like. The cleaning object is washed. In the washing apparatus main body, alkaline water after use as a cleaning liquid and strong acidic water generated by the alkaline water generator are supplied to a neutralization tank, and neutralized by mixing alkaline water and strong acidic water in the neutralization tank, and neutralizing neutral water obtained by neutralization. Return to the tank and reuse by alkaline water generator. That is, the alkaline water after use in the washing treatment may be diluted with tap water or the like to drain the water. However, in the present invention, the alkaline water after use in the washing treatment is mixed with the strong acidic water produced by the alkaline water generator to neutralize the alkaline water. Since it can be reused as neutral water, it is possible to substantially reduce the load on the environment by making almost no drainage from the cleaning device to the outside. In addition, since alkaline water has a property of being easy to micronize compared with ion-exchanged water or an organic solvent, it is possible to clean the details of the cleaning object by spraying the finely granulated alkaline water onto the cleaning object. For example, soldering and flux in the hole of the metal plate can be efficiently removed by using fine particles having a diameter smaller than that of a very narrow printing pattern such as 0.22 mm or 0.14 mm in the metal plate.

Here, in the alkaline water pressurizing means, at least one alkaline water pressurizing tank for pressurizing and supplying the alkaline water generated by the alkaline water generator is preferably provided. In this case, the alkaline water generated by the alkaline water generator can be directly supplied to the main body of the washing apparatus, but since it is necessary to employ an expensive one having high processing capacity as the alkaline water generator, it is necessary for one washing process, for example. Install an alkaline water pressurizing tank capable of storing alkaline water as much as the set amount or more, and generate alkaline water by using the time for setting the cleaning object in the washing apparatus main body, so as to sequentially store in the alkaline water pressurized tank, Two alkaline water pressurizing tanks capable of storing alkaline water at a set amount equal to or greater than the amount required for one washing process are installed, and the metal plate is cleaned using alkaline water in one alkaline water pressurizing tank. , The other It is adapted to store the number of alkalinity generated by the number generator in the alkaline alkali pressurized tanks is preferred.

Neutral water injection means for injecting neutral water into the metal plate may be provided in the washing apparatus main body. Since alkaline water remaining in the metal plate causes corrosion or the like, it is preferable to provide neutral water injection means as in the present invention, and wash the metal plate after washing with alkaline water with neutral water. In particular, if neutral water jetting means for injecting neutral water into a metal plate is installed in the main body of the washing apparatus, and soft water or neutral water used in the alkaline water supply means is used as the neutral water, the alkaline water supply means is used. Neutral water can be effectively used, and the metal plate after the washing treatment with alkaline water can be washed with neutral water.

It is also a preferred embodiment to provide heating means for heating the alkaline water supplied to the jet nozzle to 30 ° C to 60 ° C. The temperature of the alkaline water supplied to the injection nozzle is preferably set at 30 ° C or higher in consideration of the improvement of the cleaning power by softening of the flux soldering, and if it exceeds 60 ° C, the pH of the alkaline water is lowered and the cleaning power is lowered. Therefore, it is preferable to set it to 30 to 60 degreeC.

It is also a preferred embodiment to provide injection nozzles on both sides of the metal plate, respectively. The metal plate may be cleaned one by one, but when spray nozzles are provided on both sides of the metal plate and the alkaline water is sprayed toward the front and the back of the metal plate, the cleaning efficiency of the metal plate can be improved. It is preferable because it can raise. In this case, it is preferable to make the injection position of the alkaline water by the two injection nozzles aside, and to prevent the fall of the washing | cleaning force by the collision of the alkaline water sprayed from both injection nozzles. As a method of dispensing the spray positions, the spray positions may be set by setting the spray angles of alkaline water in both spray nozzles to different angles, or the positions of the spray nozzles may be set to X while setting the spray angles the same. The injection position may be shifted by shifting in the axial direction or the Y axis direction, or the injection position may be shifted by combining both. As the most preferable method, it is preferable to shift the position of both injection nozzles in the X-axis direction or the Y-axis direction while setting the injection direction of both injection nozzles orthogonal to a metal plate, and to leave the injection position.

It is also a preferred embodiment to form the injection hole of the injection nozzle into a long hole shape having an aspect ratio of 40 or more. Although the injection hole can also be formed circularly, in order to be able to wash | clean a metal plate of a large area for a short time, it is preferable to form a injection hole in the shape of a long hole with an aspect ratio 40 or more.

It is also a preferred embodiment to set the hydrogen ion index of the alkaline water to pH = 10.5 to 12.0. In other words, if the pH is too high, the metal parts of the soldering or metal plate are corroded, and if the pH is too low, a long time cleaning is required, and it is undesirable to consider drainage treatment or running coast, so the pH is set to 10.5 or more and 12.0 or less. It is desirable to.

It is also a preferred embodiment to set the volume ratio of the compressed air and the alkaline water to 500: 1 to 700: 1. In other words, when the volume ratio of the compressed air is large, sufficient cleaning power is not obtained because the amount of alkaline water that collides with the soldering is not obtained. In order to completely remove the soldering and flux from the printing pattern, a long time cleaning is required. In addition, when the volume ratio of compressed air is too small, the alkaline water cannot be sufficiently granulated, and in very narrow widths such as 0.22 mm width or 0.14 mm width, the particles of alkaline water cannot escape through the holes of the printing pattern. Sufficient cleaning effect cannot be obtained. Similarly, when the volume ratio of the compressed air is too small, there is a problem that the sprayed alkaline water forms a water film on the surface of the metal plate, which hinders the collision of new particles, thereby reducing the cleaning effect.

It is also a preferred embodiment to set the distance between the tip of the injection nozzle and the metal plate to 3 mm to 8 mm. If the distance between the tip of the injection nozzle and the metal plate is too long, the collision energy of alkaline water cannot be sufficiently applied to the cream soldering attached to the metal plate, and if it is too short, the alkaline water will not be sufficiently refined and will collide with the metal plate. In addition, since the sprayed alkaline water collides with the alkaline water splashed from the metal plate, the cleaning efficiency is lowered. Therefore, the distance between the tip of the spray nozzle and the metal plate is preferably set to 3 mm to 8 mm.

The jet nozzle for cleaning the metal plate according to the present invention is attached to and detached from a nozzle body and a tip of the nozzle body, each of which forms a flow path of compressed air and a flow path of alkaline water. It is provided with a nozzle cap attached so that it may be attached, the injection hole is formed in the front-end | tip of a nozzle cap, and the partition wall which protrudes toward the injection opening in the front-end | tip of a nozzle body is formed, The partition wall divides the space between the nozzle body and the nozzle cap into three spaces, a first space on both sides of the separation wall and a second space on the tip side of the separation wall, and a pair of first spaces. And the second space are connected through a gap formed between the tip of the dividing wall and the nozzle cap, opening the flow path of the compressed air to the pair of the first spaces, and opening the flow path of the alkaline water. From the tip of the dividing wall The opening is made into two spaces, and the alkaline water and the compressed air are mixed in the second space to refine the alkaline water.

In this injection nozzle, the compressed air is supplied to the first space on both sides of the separation wall through the flow passage inside the nozzle body, and is supplied to the second space while accelerating from the first space to a speed close to the speed of sound through the gap. . On the other hand, the alkaline water is supplied to the second space at the tip side of the separation wall through a flow path formed in the separation wall, and is mixed with the high-speed compressed air in the second space to be granulated and jetted together with the compressed air from the injection port. Then, the finely divided high-speed alkaline water jetted from the jet port is sprayed toward the metal plate to clean the metal plate. For this reason, in this injection nozzle, the same effect as the said washing | cleaning method is acquired.

Here, in the injection nozzle, the injection port can be formed in the shape of a long hole with an aspect ratio of 40 or more. Although it is possible to form the injection hole in a circular shape, in order to be able to wash | clean a metal plate of a large area in a short time, it is preferable to form an injection hole in the long hole shape of 40 or more aspect ratio.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view of the principal part in the washing | cleaning apparatus main body which concerns on this invention.

2 is a schematic explanatory diagram of a cleaning apparatus according to the present invention.

3 is a perspective view of a jet nozzle according to the present invention.

4 is an exploded perspective view of the jet nozzle according to the present invention.

5 is a cross-sectional view taken along the line V-V in FIG.

FIG. 6 is a cross-sectional view taken along the line VI-VI of FIG. 3.

7 is an explanatory diagram for a cleaning method for initial cleaning according to the present invention.

8 is an explanatory view of a cleaning method for finish cleaning according to the present invention.

Fig. 9 is an enlarged view before cleaning a printed pattern in the metal plate according to the present invention.

10 is an enlarged view of the printed pattern after washing with ion-exchanged water in the metal plate according to the present invention.

Fig. 11 is an enlarged view of the printed pattern after washing with alkaline water in the metal plate according to the present invention.

12 is a schematic explanatory view of a washing apparatus using another alkaline water generating apparatus according to the present invention.

Explanation of symbols on the main parts of the drawings

1: metal plate 2: printed pattern

2A: Formation Range 3: Hole

4: flux 5: soldering

10 metal plate cleaning device 11 cleaning device body

12 housing 13 reinforcement frame

14: alkaline water injection nozzle 15: flow path

15a: branch path 16: distribution path

17: nozzle body 18: nozzle cap

19: retainer 20: supply pipe

21: plug 22: nozzle

23: dividing wall 24: first space

25: second space 26: gap

27: Compressor 28: neutral water injection nozzle

29 heating means 30 alkaline water supply device

31: soft water generating means 32: alkaline water generating means

33: alkaline water pressurized tank 34: neutral water pressurized tank

40: alkaline water supply device 41: water storage tank

42: alkaline water generator 43: neutralization tank

44: aeration pipe 45: water supply tank

46: water softener 47: aeration pipe

F1: 1st filter F2: 2nd filter

F3: 3rd order filter F4: 4th order filter

HV: Valve SV1: Valve

SV2: Valve P1: Pump

P2: Pump P3: Pump

P4: Pump

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described, referring drawings.

As shown in Figs. 1 and 2, the metal plate cleaning apparatus 10 includes a metal plate 1 containing finely divided alkaline water. A cleaning device main body 11 for jetting the metal plate 1 to clean the metal plate 1, and an alkaline water supply device 30 for supplying alkaline water. Doing.

A frame-shaped reinforcement frame 13 is integrally provided on the outer circumferential portion of the metal plate 1, and the metal plate 1 is a housing of the cleaning device body 11. It is supported so as to maintain a constant angle with the horizontal direction in the housing 12, and the alkaline water injected by the metal plate 1 is comprised so that it may flow along the metal plate 1. As shown in FIG. Although the inclination angle with respect to the horizontal direction of the metal plate 1 can be set arbitrarily, in order to make the washing | cleaning apparatus main body 11 very small, as shown in FIG. 1, FIG. 12, it set to the horizontal direction and 90 degrees, It is preferable to support the housing 12 in the vertical direction.

On both sides before and after the metal plate 1, a pair of alkaline water injection nozzles 14 for injecting alkaline water into the metal plate 1 face each other. The alkaline water jetting nozzles 14 on both sides are supported to be movable in the X-axis direction and the Y-axis direction by moving means not shown in the figure. As the moving means, any configuration can be adopted, and for example, a guide rod in the X-axis direction and the Y-axis direction, and a motor for moving in the X-axis direction and the Y-axis direction are provided. It can employ | adopt.

As shown in FIG. 2, the alkaline water jetting nozzles 14 before and after are orthogonal to the metal plate 1 in the direction in which alkaline water is jetted, and the alkaline water jetting position is fixed in the X axis direction. It is provided so as to face away from the distance S. As a result, the alkaline waters ejected from the front and rear alkaline water injection nozzles 14 can prevent collisions or interference with each other, thereby preventing deterioration of the cleaning effect, and sprayed from one nozzle 14. Soldering (5) or flux (4) (see Figs. 9 and 10) that cannot be removed by alkaline water are removed by alkaline water sprayed from the other nozzle 14 It is configured to do so. The distance G between the tip of the alkaline water jet nozzle 14 and the metal plate 1 is set to 3 mm to 8 mm. If the distance G between the tip of the alkaline water injection nozzle 14 and the metal plate 1 is too long, the collision energy of alkaline water is applied to the soldering 5 or the flux attached to the metal plate 1. If it is not sufficiently applied to 4) and is too short, the alkaline water does not sufficiently refine and collides with the metal plate 1, and the sprayed alkaline water collides with the alkaline water splashed from the metal plate 1, thereby deteriorating the cleaning efficiency. Therefore, it is preferable to set the distance G between the tip of the alkaline water jet nozzle 14 and the metal plate 1 to 3 mm to 8 mm.

As shown in Figs. 3 to 6, the alkaline water jet nozzle 14 has a nozzle body which forms a flow path 15 for compressed air and a flow path 16 for alkaline water ( 17, a nozzle cap 18 attached to and detached from the tip of the nozzle body 17, and a retainer for fixing the nozzle cap 18 to the nozzle body 17. 19 and a plug 21 for connecting the supply pipe 20 of the compressed air to the nozzle body 17 are provided. As the injection nozzle, one having a configuration other than that illustrated in Figs. 3 to 6 may be employed.

The tip of the nozzle cap 18 is formed with a long, long hole-shaped injection port 22 in the vertical direction, and the tip of the nozzle body 17 is separated to protrude toward the injection port 22 A wall 23 is formed, and the space between the nozzle body 17 and the nozzle cap 18 is formed by the separation wall 23 so that the first space 24 on both sides of the separation wall 23 is formed. And three spaces of the second space 25 on the tip end side of the separation wall 23. A gap 26 is formed between the tip end of the dividing wall 23 and the nozzle cap 18, and the first space 24 and the second space 25 are connected through the gap 26. A pair of compressed air flow passages 15 are formed in the nozzle body 17, and the downstream portions of both flow passages 15 are branched into six branch passages 15a, respectively. Each of the two first spaces 24 is opened, and the alkaline water flow path 16 is opened to the second space 25 at the distal end of the dividing wall 23.

In this alkaline water injection nozzle 14, compressed air is supplied to each of the two first spaces 24 through a pair of flow passages 15, and also to the second space 25 through the gap 26. It is supplied symmetrically. The flow path 15 has a small cross section of the passage in the branch passage 15a, and in the first space 24, the cross section of the passage becomes small as it progresses toward the gap 26 side. As a result, the compressed air accelerates and flows into the second space 25 at high speed while advancing toward the gap 26 in accordance with Bernoulli's law. On the other hand, the alkaline water is supplied to the second space 25 through the flow path 16, but since the cross-sectional area of the flow path 16 becomes smaller in the separation wall 23, the alkaline water accelerates in the separation wall 23. In this state, it is supplied to the second space 25. In the second space 25, the compressed air and the alkaline water are mixed at a high speed. As a result, the alkaline water is finely granulated in the second space 25, and in this state, the compressed water and the alkaline water are fined. Sprayed. Alkaline water, however, has properties that tend to be finer than ion-exchanged water or organic solvents, and the finely divided alkaline water particles have a printing pattern as shown in FIG. Since it becomes a diameter which can pass easily through the hole 3 of the printing pattern 2, it collides with the soldering 5 inside the printing pattern 2, and solders with the pressure energy. ) Can be removed. Moreover, since alkaline water has the ability to saponify and disperse an oil component, it has the effect of saponifying and disperse | distributing the flux 4, and making it easy to wash | clean. Thereby, the flux 4 adhering to the metal plate 1, the flux 4 in the printed pattern 2, and the soldering 5 are removed, and washing | cleaning is implement | achieved.

The opening width W of the injection port 22 is preferably set to 0.3 mm or more and 0.7 mm or less, and the opening length L is preferably set to 20 mm or more and 30 mm or less. Moreover, it is preferable to set the aspect ratio (L / W) of the injection port 22 to 40 or more. Although the injection port 22 can also be formed in a circular shape, the aspect ratio L / W has a long hole shape of 40 or more so that the metal plate 1 having a large area can be cleaned in a short time. It is preferable to form.

The moving speed of the alkaline water injection nozzle 14 by the moving means is preferably set from 5 mm / sec or more to 20 mm / sec or less. If the moving speed is less than 5mm / sec, the cleaning treatment speed is slow, it takes a long time, and if it exceeds 20mm / sec, cleaning failure occurs. Moreover, it is preferable to set the injection quantity of the alkaline water from the alkaline water injection nozzle 14 to 500 cc / min or less from 500 cc / min or more. If the injection amount is less than 500 cc / min, poor cleaning occurs, and if it exceeds 700 cc / min, the consumption of alkaline water increases, and it is necessary to employ a large one as the alkaline water supply device 30. A water film is formed on the surface of the metal plate 1, and conversely, a problem arises that the washing | cleaning ability falls.

The volume ratio of the compressed air and alkaline water is set to 500: 1 to 700: 1. In other words, when the volume ratio of the compressed air is large, sufficient cleaning power is not obtained because the amount of alkaline water colliding with the soldering 5 is reduced, so that the soldering 5 and the flux 4 are completely removed from the printing pattern 2. In order to remove it quickly, a long time washing | cleaning is needed. In the case where the volume ratio of the compressed air is too small, the alkaline water cannot be sufficiently granulated, so in very narrow widths such as 0.22 mm width or 0.14 mm width, the particles of alkaline water are formed in the holes 3 of the printing pattern 2. ) Can't get out of it, so you can't get enough cleaning effect. Similarly, if the volume ratio of the compressed air is too small, the phenomenon that the injected alkaline water forms a water film on the surface of the metal plate 1 will interfere with the collision of new particles, thereby reducing the cleaning effect.

As compressed air, so-called factory air compressed by a compressor 27 is used, but it is preferable to sufficiently remove oil components and unnecessary moisture by a filter or a dryer. The pressure of the compressed air also varies depending on the ratio of the cross-sectional area of the gap 26 and the flow path 15 of the compressed air, but when it is lowered, it is preferable that the pressure is 0.5 MPa or more because sufficient flow rate and flow rate cannot be obtained. In this embodiment, it is set to 0.5 MPa.

Heating means 29 for supplying alkaline water supplied from the alkaline water supply device 30 to the alkaline water injection nozzle 14 in the state in which the alkaline water supply device 30 is heated to 30 ° C to 60 ° C. Is provided, and the heating means 29 is configured to heat the alkaline water so as to soften the flux of the cream soldering adhered to the metal plate 1 to improve the cleaning power. . It is preferable to set the temperature of the alkaline water supplied to the alkaline water injection nozzle 14 to 30 ° C. or more, which is the softening temperature of the flux of the cream soldering. Since it falls, it is preferable to set to 30 to 60 degreeC. As the heating means 29, any structure can be adopted, for example, a heat exchanger in which a plurality of alkaline water flow paths are formed in a metal block, and a heater for heating the heat exchanger ( and a heater configured to allow the alkaline water to flow through the flow passage while the metal block is heated by the heater, and to heat the alkaline water to the set temperature. It is preferable to provide this heating means 29 in terms of improving the cleaning power of alkaline water, but the omitted means is also included in the scope of the present invention.

Next, an alkaline water supply device 30 for supplying alkaline water will be described.

As shown in FIG. 2, the alkaline water supply device 30 includes a soft water generating means 31, an alkaline water generating means 32, and an alkaline water pressurized tank. An alkaline water tank 33 and a neutral water pressure tank 34 are provided. In the present embodiment, alkaline water is generated from tap water and supplied to the washing apparatus main body 11, but commercially available alkaline water can be used as the washing liquid as it is.

The soft water producing means 31 has a well-known structure for producing soft water by ion exchange resin, and for example, SS-04E manufactured by SAMSON of Japan can be suitably used.

The alkaline water generating means 32 is of a well-known configuration for generating alkaline water by increasing hydroxyl ions (OH) on the cathode side by electrolyzing water, and for example, Japanese Amano Co., Ltd .; Δ1500K available from AMANO Eco Technology Corporation) can be suitably used. Alkaline water has a detergency depending on its pH. If the pH is high, the cleaning power is improved. If the pH is higher than 12, the metal plate 1 and the soldering 5 may be corroded. On the other hand, when pH is lower than 10.5, since long time washing | cleaning is required in order to remove the soldering 5 and the flux 4 completely, a large amount of alkaline water is needed and it is unpreferable. For this reason, it is preferable that the pH of alkaline water exists in the range of 10.5-12.0, and it is especially preferable to exist in the range of 11.2-11.5.

There are many kinds of bases used in alkaline water, such as sodium hydroxide and potassium carbonate. However, if the pH is in the above range, the kind of base is not particularly problematic.

Next, a cleaning method using the cleaning device 10 will be described with reference to FIG.

First, tap water is supplied to the soft water generating means 31 to generate alkaline water by the alkaline water supply device 30 to generate soft water in the soft water generating means 31. Specifically, 1.9 liters of soft water are produced per minute. Part of the soft water produced by the soft water producing means 31 is used as soft water for producing alkaline water, and the remainder is supplied to the neutral water pressurized tank 34, and the metal plate by alkaline water is described later. It is used as a rinsing water after washing of (1).

Next, the soft water generated by the soft water generating means 31 is supplied to the alkaline water generating means 32, and the alkaline water generating means 32 generates alkaline water. Specifically, 1.5 liters of alkaline water and 0.4 liters of neutral water are produced from 1.9 liters of soft water. Potassium carbonate is used to generate alkaline water. The generated alkaline water is sequentially supplied to the alkaline water pressurizing tank 33, and is stored in the alkaline water pressurizing tank 33 by a set amount or more necessary for one washing. On the other hand, since neutral water is also generated at the time of generation of alkaline water, the neutral water can be supplied to the neutral water pressurizing tank 34 together with the soft water.

Next, the alkaline water is pressurized from the alkaline water pressurization tank 33 to the heating means 29 by the compressed air from the compressor 27 in order to clean the metal plate 1 in the washing apparatus main body 11. V) heating the alkaline water to a set temperature of 30 ° C. to 60 ° C., supplying it to the alkaline water injection nozzle 14, and compressing the compressed air from the compressor 27 to the alkaline water injection nozzle 14. By supplying and mixing alkaline water and compressed air in the alkaline water jet nozzle 14, the alkaline water is granulated, and the finely divided alkaline water is injected from the injection port 22 toward the metal plate 1. While moving, the alkaline water jetting nozzles 14 are sequentially moved along the metal plate 1 in the X-axis direction and the Y-axis direction by means of the moving means, and the fine particles of alkaline water Removed by washing the solder 5 and the flux 4 attached to talpan (1).

More specifically, the metal plate 1 is cleaned by the following initial cleaning process and finish cleaning process.

In the initial cleaning step, the alkaline water injection nozzle 14 is moved by a moving distance in the + X axis direction by a moving means while spraying the alkaline water from the alkaline water injection nozzle 14, and then the predetermined distance is moved in the + Y axis direction. After that, after moving a predetermined distance in the -X axis direction, the predetermined distance is moved in the + Y axis direction, and then the movement in the + X axis direction is repeated to clean the entire metal plate 1.

In the final cleaning step, the alkaline water jet nozzle 14 is moved to the printing pattern 2 portion of the metal plate 1 in order to intensively clean the portion of the printing pattern 2, and then the printing pattern 2 portion is Similarly to the initial cleaning, the alkaline water jetting nozzle 14 is moved by the moving means while the alkaline water jetting nozzle 14 sprays the alkaline water to clean the entire portion of the printed pattern 2.

As described above, the cleaning consists of two processes: initial cleaning and final cleaning, and the entire metal plate 1 is cleaned by initial cleaning, that is, not only the surface of the printing pattern 2 but also the metal plate 1. Remove the soldering (5) and flux (4) attached to the surface of). Since alkaline water has the effect of saponifying and dispersing an oil component, the flux 4 on the surface of the metal plate 1 is removed. In the final washing, only the pattern portion is washed. Alkaline water has a property of being easily refined as compared with ion-exchanged water, and since the finely alkaline particles can easily pass through the printed pattern 2, they collide with the soldering 5 inside the pattern. Soldering (5) is removed with the pressure energy. Thereby, the flux 4 adhering to the metal plate 1, the flux 4 in the printed pattern 2, and the soldering 5 are removed, and washing | cleaning is implement | achieved.

After washing the metal plate 1 in this way, the neutral water stored in the neutral water pressurizing tank 34 is removed from the neutral water injection nozzle 28 in the metal plate 1 on the front and rear surfaces thereof. The alkaline water adhering to the metal plate 1 is sprayed to clean the neutral water, and the metal plate 1 is dried to complete the cleaning of the metal plate 1. In addition, the drainage after washing | cleaning is collected by the drainage tank which is not shown in the figure installed in the bottom part of the housing 12, and it drains after removing the soldering 5 through a filter. On the other hand, at least one alkaline water pressurizing tank 33 may be installed, for example, two alkaline water pressurizing tanks 33 are installed, that is, alkaline water pressurizing tank 33 is formed by alkaline water in one of the alkaline water pressurizing tanks 33. Alkaline water while washing the metal plate 1, washing the metal plate 1 with neutral water in the neutral water pressurizing tank 34, and drying the metal plate 1. It is preferable to configure the pressurized tank 33 to store the alkaline water generated by the alkaline water generating means 32 in terms of reducing waste of time.

As a specific cleaning method of the metal plate 1 using the washing | cleaning apparatus main body 11, the washing | cleaning method of washing | cleaning the metal plate 1 can also be employ | adopted as the following primary washing | cleaning and finishing washing | cleaning sequentially.

In the initial cleaning, first, as shown in Fig. 7, the alkaline water jetting nozzles 14 are moved to the lower left edge of the formation range 2A of the printing pattern 2 by the moving means. Next, the alkaline water jetting nozzles 14 are moved substantially horizontally from the left edge to the right edge of the formation range 2A while spraying the alkaline water fine particles from the alkaline water jetting nozzles 14 onto the metal plate 1. Thereafter, the alkaline water jetting nozzles 14 are once moved upwards so that the injection ranges of alkaline water partially overlap the upper and lower sides, and then the alkaline water jetting nozzles 14 are moved in the opposite direction to the formation range 2A. After moving substantially horizontally from the right edge to the left edge, the operation of moving the alkaline water jetting nozzles 14 upward is repeated to wash the entire forming range 2A of the print pattern 2 in order from the lower side. On the other hand, the formation range 2A of the printing pattern 2 is set in advance for each metal plate 1 so that all the printing patterns 2 formed in the metal plate 1 are included. Further, the initial cleaning may be performed from the lower right edge of the forming range 2A of the printing pattern 2.

In the final cleaning, first, as shown in Fig. 8, the alkaline water jet nozzle 14 is moved to the upper left edge of the metal plate 1 by the moving means. Next, the alkaline water jetting nozzles 14 are moved substantially horizontally from the left edge of the metal plate 1 to the right edges while jetting the alkaline water fine particles from the alkaline water jetting nozzles 14 to the metal plate 1. Thereafter, the alkaline water jetting nozzles 14 are first moved downward so that the injection range of the alkaline water partially overlaps the upper and lower sides, and then the alkaline water jetting nozzles 14 are moved from the right edge of the metal plate 1 in the opposite manner to the above. After moving substantially horizontally to the left edge, the operation of moving the alkaline water injection nozzle 14 once downward is repeated to clean the entire surface of the metal plate 1 in order from the upper side. However, since the reinforcement frame 13 is provided in the outer edge part of the metal plate 1, the part exposed to the inside of the reinforcement frame 13 in the metal plate 1 is wash | cleaned. On the other hand, finish cleaning can also be performed from the upper right edge of the metal plate 1.

In this cleaning method, since the entire cleaning range 2A of the printing pattern 2 is sequentially cleaned from the lower side by the initial cleaning, the cream soldering attached to the metal plate 1 is lowered along the metal plate 1. The cleaning failure caused by the solidification of the cream soldering can be prevented by absorbing the alkaline water after the washing treatment flowing down into the solidification to prevent solidification. In this initial cleaning, since only the formation range 2A of the printing pattern 2 is cleaned, the cleaning processing time can be significantly shortened as compared with the case where the entire surface of the metal plate 1 is cleaned. After the initial cleaning, the entire surface of the metal plate 1 is sequentially cleaned from the upper side in the final cleaning, so that even if the cream soldering is reattached in the initial cleaning, this can be cleaned. In addition, since alkaline water has an effect of saponifying and dispersing an oil component, the flux 4 on the surface of the metal plate 1 can also be removed. In addition, alkaline water has a property of being easier to be finer than ion-exchanged water, and since the finely divided particles of alkaline water can easily pass through the inside of the printing pattern 2, the soldering 5 inside the pattern It can collide and remove the soldering 5 with the pressure energy. As a result, the flux 4 and the soldering 5 in the flux 4 or the printed pattern 2 attached to the metal plate 1 can be removed.

Next, the cleaning test of the metal plate 1 performed in order to verify the effect of the cleaning method of this invention is demonstrated.

The used metal plate 1 is of a so-called medium size substrate of 330 mm x 250 mm, and the pattern is for a QFP (Quad Flat Package) having a width of 0.14 mm. In the test, after applying the cream soldering to the metal plate 1 and confirming that the cream soldering is filled in the entire hole 3 of the printing pattern 2, ion exchange water (pH 6 to) The results of washing using two types of cleaning solutions (pH 7) and alkaline water (pH 11.2) were compared.

Fig. 9 is a pattern shape before cleaning, in which the flux 4 and the soldering 5 are attached to the hole 3. 10 shows the result of washing with ion-exchanged water, and FIG. 11 shows the result of washing with alkaline water. 10 and 11, in the cleaning using ion-exchanged water, the soldering 5 and the flux 4 are removed not only in the printing pattern 2 but also on the surface of the metal plate 1 around the pattern. In contrast, in the cleaning using alkaline water, the soldering 5 and the flux 4 in the printing pattern 2 and the surface of the metal plate 1 are completely removed, and the metal plate 1 is removed. ), No damage was observed. The time taken for washing was 46 minutes for the ion-exchanged water, and the alkaline water was 26 minutes, and the cleaning time was about 60% higher than that for the ion-exchanged water.

Next, another embodiment in which the configuration of the alkaline water supply device 30 is partially changed will be described. On the other hand, the same reference numerals are given to the same members as the above embodiments, and detailed description thereof will be omitted.

As shown in Fig. 12, this alkaline water supply device 40 supplies alkaline water consisting of alkaline electrolytic water as the cleaning liquid to the cleaning device main body 11, thereby providing a salt concentration. Using a storage tank 41 for storing neutral water set to a constant concentration, and neutral water in the storage tank 41, alkaline water consisting of alkaline electrolytic water and strong acid water as a by-product thereof are generated. Alkaline water generator 42, alkaline water after being supplied from the alkaline water generator 42 and used as the cleaning liquid in the washing machine main body 11, and generated in the alkaline water generator 42 It is provided with a neutralization tank 43 which mixes and neutralizes strong acidic water, and returns the neutral water produced | generated in the neutralization tank 43 to the water storage tank 41. FIG. Document is to be reused after the alkaline cleaning liquid is used as a deionized water. On the other hand, alkali electrolyzed water means water whose pH obtained by electrolyzing water is 7.5 or more.

In the reservoir tank 41, for example, 100 liters of neutral water having a salt concentration of 0.05 to 0.2% is stored. If the salt concentration is less than 0.05%, the pH of the alkaline water generated by the alkaline water generator 42 cannot be sufficiently increased. If the salt concentration is greater than 0.2%, the salt is supplied to the washing apparatus main body 11 or the alkaline water supply device 40 by salt. Since rust etc. generate | occur | produce easily, it is preferable to set to 0.05 to 0.2%. In addition, an aeration pipe 44 is provided in the bottom of the water storage tank 41, and a pump P4 is connected to the aeration pipe 44, and the neutral in the water storage tank 41 is neutralized. The water is agitated by bubbles discharged from the aeration pipe 44, and the salt concentration is configured to be constant.

In the storage tank 41, a level sensor not shown in the figure for measuring the storage amount of the stored neutral water is provided, and the water supply tank 45 is provided with a pump P1 and a water softener 46. Is connected via the water supply tank 41, and when the storage water of the neutral water in the water storage tank 41 falls to the lower limit level, the water in the water supply tank 45 passes through the water softener 46 to set the level. It is configured to automatically supply to the water storage tank 41 up to the level). That is, since the neutral water of the storage tank 41 decreases by evaporation or washing | cleaning at the time of washing | cleaning, the neutral water thus reduced is replenished automatically. On the other hand, although not shown in the drawing, when the water is supplied from the water supply tank 45 into the water storage tank 41, since the salt concentration of the neutral water in the water storage tank 41 is lowered, the same salinity concentration as the neutral water of the water storage tank 41 is obtained. To supply water to the water supply tank 45, or to adjust the salt concentration of the neutral water in the storage tank 41 by hand by measuring the salt concentration of the storage tank 41 at regular intervals, or the water supply tank It is configured to automatically supply sodium chloride according to the quantity supplied from the 45 to the water storage tank 41 to the water storage tank 41 so that the salt concentration of the water storage tank 41 is kept constant. However, the water supply tank 45 and the pump P1 may be omitted so that the tap water may be directly supplied to the water softener 46.

The alkaline water generator 42 is connected to the water storage tank 41 with the pump P2, the fourth filter F4 and the valve SV1 interposed therebetween, and the neutral water in the water storage tank 41 is the fourth filter F4. For example, after the oil component and the residue of 0.5 micrometer-1.0 micrometer in diameter are removed, it is supplied to the alkaline water generator 42. In addition, a part of the neutral water purified by the fourth filter F4 is supplied to the neutral water pressurizing tank 34 via the valve SV2. Then, by supplying compressed air from the compressor 27 to the neutral water pressurizing tank 34, the neutral water in the neutral water pressurizing tank 34 is pressurized and supplied to the neutral water spray nozzle 28, and from the neutral water spray nozzle 28, In the metal plate 1, neutral water is sprayed on both surfaces of the front and back surfaces, so that the alkaline electrolytic water attached to the metal plate 1 can be washed with neutral water.

The alkaline water generator 42 has a well-known configuration for producing alkaline water consisting of alkaline electrolytic water and strong acid water, which are by-products, by electrolyzing water using sodium chloride as an electrolytic aid. Techno Super502 made by NASASTEC Co., Ltd. can be suitably employed. If the pH of the alkaline water is set to a high value, the cleaning power is improved. However, if the pH is higher than 12, the metal plate 1 or the soldering 5 may be corroded. If the pH is lower than 10.5, the cleaning power is lowered and the cleaning time is reduced. Since it becomes long and a large amount of alkaline water is needed, it is preferable to set in the range of 10.5-12.0, and it is especially preferable to set in the range of 11.2-11.5. Moreover, as strong acidic water, the thing of pH 2.3-2.7 is produced | generated about the same quantity as alkaline water.

The alkaline water generator 42 is connected to the heating means 29 of the washing apparatus main body 11 via the alkaline water pressurizing tank 33, and the alkaline water generated in the alkaline water generator 42 is the alkaline water pressurizing tank 33. ) Is sequentially supplied to the alkaline water pressurizing tank 33 and stored in the alkaline water pressurizing tank 33 by a set amount or more necessary for one time of washing. When cleaning the metal plate 1, alkaline water is pressurized and supplied from the alkaline water pressurization tank 33 to the heating means 29 by pressurized air from the compressor 27 as in the above embodiment. After heating to a set temperature of 60 ° C. to 60 ° C., this is supplied to the alkaline water jet nozzle 14, and the compressed air from the compressor 27 is supplied to the alkaline water jet nozzle 14 to supply the alkaline water jet nozzle ( In the 14), the alkaline water is granulated by mixing alkaline water and compressed air, and the alkaline water jetting nozzle 14 is moved by the moving means while spraying the finely divided alkaline water from the injection port 22 toward the metal plate 1. ) Is sequentially moved along the metal plate 1 in the X-axis direction and the Y-axis direction, and is attached to the metal plate 1 by micronized particles of alkaline water. Removed by washing the solder 5 and the flux (4). On the other hand, in the specific cleaning method of the metal plate 1, as in the above-described embodiment, the initial cleaning and the final cleaning are carried out, and the neutral water stored in the neutral water pressurizing tank 34 is finally removed from the neutral water injection nozzle 28. In the plate 1, the alkaline water attached to the metal plate 1 is cleaned by spraying toward the front and rear surfaces thereof, and the metal plate 1 is dried to complete the cleaning of the metal plate 1. In addition, at least one alkaline water pressurizing tank 33 may be provided. For example, two alkaline water pressurizing tanks 33 may be provided, that is, a metal plate made of alkaline water in one alkaline water pressurizing tank 33. The other alkaline water pressurizing tank 33 while washing (1), washing the metal plate 1 with neutral water in the neutral water pressurizing tank 34, and drying the metal plate 1 are carried out. It is preferable to configure the alkaline water generated by the alkaline water generator 42 to store the waste of time.

On the other hand, alkaline water and neutral water after use in washing of the metal plate 1 are supplied to the neutralization tank 43 after the soldering in alkaline water is removed through the primary filter F1, and the alkaline water generator 42 The strong acidic water generated by the same is supplied into the neutralization tank 43 as it is, and the alkaline and strong acidic water are neutralized by being agitated by the air supplied from the pump P4 to the aeration pipe 47 in the neutralization tank 43. do. This neutralization produces neutral water in the neutralization tank 43 having a pH of 6 to 8 and a salt concentration approximately equal to that of the water storage tank 41. On the other hand, at the beginning of operation of the washing apparatus 10, a predetermined amount of alkaline water is sequentially stored in the alkaline water pressurizing tank 33, and only strong acidic water is stored in the neutralizing tank 43. Therefore, when the washing apparatus 10 is operated while the alkaline water pressurizing tank 33 and the neutralization tank 43 are empty, the alkaline water pressurizing tank 33 is stored in the alkaline water pressurizing tank 33 in the strong acid water generated in the alkaline water generator 42. The strong acidic water in the same amount as the alkaline water is discharged to the outside of the washing apparatus 10 without inputting to the neutralization tank 43, so that the same amount of alkaline water and the strong acidic water are supplied into the neutralization tank 43.

The neutralization tank 43 is connected to the water storage tank 41 through the pump P3, the secondary filter F2, and the tertiary filter F3, and the neutralized neutral water in the neutralization tank 43 is the secondary filter. After removal of oil components or debris having a diameter of 0.5 μm or more by (F2), for example, metal hydroxides having a diameter of 0.35 μm or more are removed by a tertiary filter F3. The oil component of 0.5 μm or more is removed and returned to the water storage tank 41. On the other hand, when the neutral water in the water storage tank 41 is dirty, the valve (HV) is opened to filter the neutral water in the water storage tank 41 with the fourth filter F4 and then to the outside of the washing apparatus 10. Discharge. In addition, the position in which the filters F1 to F4 are provided may be appropriately changed in consideration of the load on the pump.

In this alkaline water supply device 40, alkaline water generated from neutral water is used for washing the metal plate 1, and then alkaline water after use in this washing is used using strong acidic water generated as a by-product when alkaline water is produced. Since neutral water can be neutralized and the neutralized water obtained can be reused to generate alkaline water, it is not necessary to discharge the alkaline water after washing to the outside of the washing apparatus 10 over a long period of time. Since it can be discharged as water, it is possible to realize an excellent cleaning device in terms of environment.

According to the cleaning method of the metal plate, the cleaning apparatus, and the metal jet nozzle for cleaning the metal plate according to the present invention, the alkaline nozzle and the compressed air are mixed into the jet nozzle to finely granulate to the size that can pass through the holes of the printed pattern. Since the jet is sprayed from the jet nozzle to the metal plate in the state, the finely divided alkaline water can collide with the soldering balls or the flux inside the printing pattern to effectively and efficiently remove the soldering or the flux. In addition, since alkaline water has the ability to saponify and disperse oil components, it has the effect of saponifying and dispersing the flux so that it is easy to clean, and therefore the flux adhered to the metal plate and the flux in the hole of the printing pattern are more efficiently and It is removed cleanly. In addition, since only organic water is used to clean organic solvents, the waste liquid after washing does not need to be treated as industrial waste, which significantly reduces the load on the environment. The working environment can also be improved. In addition, since alkaline water is not volatile like organic solvents, it does not always need to be replenished, and since running water is sufficient to dry after washing, the running cost is also low. In addition, since alkaline water has a property of being easily refined compared to ion-exchanged water or an organic solvent as described above, it can be finely granulated to a diameter smaller than a hole of a very narrow printing pattern such as 0.22 mm width or 0.14 mm width. Soldering and flux in the holes can be removed efficiently.

Claims (23)

As a method of cleaning a metal plate used for printing cream soldering on a printed wiring board, Alkaline water and compressed air are mixed in an injection nozzle to finely granulate the alkaline water, and the finely granulated alkaline water is rapidly flowed from the injection nozzle toward the metal plate. Cleaning the metal plate by spraying The cleaning method of a metal plate characterized by the above-mentioned. The method according to claim 1, While maintaining the metal plate at a constant angle with the horizontal direction, the alkaline plate is reciprocated in the horizontal direction while spraying alkaline water from the injection nozzle toward the metal plate, thereby cleaning the metal plate in order from the lower side. To do The cleaning method of a metal plate characterized by the above-mentioned. The method of claim 2, After the initial cleaning, while cleaning the metal plate in order from the upper side by reciprocating the spray nozzle in the horizontal direction while spraying alkaline water from the injection nozzle toward the metal plate. The cleaning method of a metal plate characterized by the above-mentioned. The method of claim 3, In the above-mentioned initial cleaning, alkaline water is sequentially sprayed onto the formation range of the printing pattern of the metal plate to perform the initial cleaning, In the final cleaning, the final cleaning by spraying alkaline water sequentially to the entire surface of the metal plate The cleaning method of a metal plate characterized by the above-mentioned. The method according to any one of claims 1 to 4, And supplying the alkaline water to the spray nozzle while heating the alkaline water at 30 ° C to 60 ° C. The method according to any one of claims 1 to 5, The hydrogen ion index of the said alkaline water was set to pH = 10.5-12.0, The washing method of the metal plate characterized by the above-mentioned. The method according to any one of claims 1 to 6, The volume ratio of the compressed air and the alkaline water is set to 500: 1 to 700: 1. The method according to any one of claims 1 to 7, A method for cleaning a metal plate, characterized in that the distance between the tip of the spray nozzle and the metal plate is set to 3 mm to 8 mm. As a cleaning device for a metal plate used to print cream soldering on a printed wiring board, Alkaline water supply means for pressurizing and supplying alkaline water, Compressed air supply means for supplying compressed air, A washing apparatus main body that sequentially cleans a metal plate using alkaline water and compressed air supplied from the two supply means, wherein the alkaline water and compressed air supplied from the both supply means are mixed and the alkaline water is supplied. A spray nozzle capable of spraying water in a state of finely granulated water, and a moving means for relatively moving the spray nozzle along a metal plate, and spraying the granulated alkaline water into a spray nozzle. The cleaning apparatus main body which sequentially cleans the metal plate by moving the injection nozzle relatively along the metal plate by the moving means while spraying from the high speed toward the metal plate. The cleaning apparatus of the metal plate characterized by the above-mentioned. The method of claim 9, As the alkaline water supply means, Soft water producing means for producing soft water from tap water, Alkaline water generating means for generating alkaline water from soft water produced by the soft water producing means, Alkaline water pressurizing means for pressurizing the alkaline water generated by the alkaline water generating means The washing | cleaning apparatus of the metal plate using what was equipped. The method of claim 10, As the alkaline water supply means, A storage tank for storing neutral water having a salt concentration set to a constant concentration; An alkaline water generator for generating alkaline water consisting of alkaline electrolytic water and strong acid water as a by-product using alkaline water in the reservoir tank; Alkaline water pressurizing means for pressurizing and supplying alkaline water generated by the alkaline water generator to the injection nozzle; A neutral tank, which is neutralized by mixing alkaline water supplied from the alkaline water generator and used as a cleaning liquid in the washing machine main body and strong acidic water generated in the alkaline water generator, is neutralized. Equipped, Returning the neutral water produced in the neutralization tank to the water storage tank and reusing the alkaline water after use as the washing liquid as the neutral water. The cleaning apparatus of the metal plate characterized by the above-mentioned. The method of claim 11, And at least one alkaline water pressurizing tank for pressurizing and supplying alkaline water generated in said alkaline water generator to said alkaline water pressurizing means. The method according to any one of claims 9 to 12, A cleaning apparatus for a metal plate, characterized in that a neutral water jetting means for injecting neutral water into the metal plate is provided in the cleaning device body. The method according to any one of claims 9 to 12, A neutral water jetting means for injecting neutral water into the metal plate is provided in the washing apparatus main body, and soft water or neutral water used in the alkaline water supply means is used as the neutral water. The method according to any one of claims 9 to 14, And a heating means for heating the alkaline water supplied to the spray nozzle to 30 占 폚 to 60 占 폚. The method according to any one of claims 9 to 15, And a spray nozzle is provided on both sides of the metal plate, respectively. The method of claim 16, And a jetting position of alkaline water by the two injection nozzles. The method according to any one of claims 9 to 17, The spraying device of the said injection nozzle was formed in the shape of a long hole with an aspect ratio of 40 or more, The cleaning apparatus of the metal plate characterized by the above-mentioned. The method according to any one of claims 9 to 18, The hydrogen ion index of the said alkaline water was set to pH = 10.5-12.0, The washing | cleaning apparatus of the metal plate characterized by the above-mentioned. The method according to any one of claims 9 to 19, And a volume ratio of the compressed air to the alkaline water is set to 500: 1 to 700: 1. The method according to any one of claims 9 to 20, And a distance between the tip of the jet nozzle and the metal plate is set to 3 mm to 8 mm. A nozzle body forming a flow path of compressed air and a flow path of alkaline water, The nozzle cap attached to the front end of the nozzle body to be attached or detached Equipped, A spray hole is formed at the tip of the nozzle cap, Forming a separating wall protruding toward the injection hole at the tip of the nozzle body, The partition wall divides the space between the nozzle body and the nozzle cap into three spaces, the first space on both sides of the separation wall and the second space on the tip side of the separation wall. A pair of the first space and the second space is connected through a gap formed between the tip of the separation wall and the nozzle cap, Opening the flow path of the compressed air to each of the pair of first spaces, and opening the flow path of the alkaline water from the distal end of the separation wall to the second space, The fine granulation of alkaline water by mixing alkaline water and compressed air in the second space A jet nozzle for cleaning a metal plate. The method of claim 22, An injection nozzle for cleaning a metal plate, wherein the injection hole is formed into a long hole shape having an aspect ratio of 40 or more.

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