JPH07301596A - Suction cell, flux densitometer and moisture densitometer - Google Patents

Abstract

PURPOSE:To perform the sampling, inner cleaning and cleaning with a liquid to be used operations quickly and easily by providing a sample liquid sampling means. CONSTITUTION:A sample suction mechanism 10 comprises a cylinder 11, and a piston 12 being moved up and down through a shaft 13. The nozzle part 20, screwed through an O-ring to the lower end of the cylinder 11, is coupled liquid-tightly with the mechanism 20. A sample liquid sucked by the mechanism 10 through a sample port 21 ascends in a liquid flow furnace 22 and introduced into the cylinder 11. In this regard, ultraviolet rays, visible rays, etc., enter through a disc-like photometric window 31 the sample liquid contained in a columnar liquid containing section 23 formed in the way of a channel 22 and the light transmitted through the sample liquid is received by a detector through a disc-like photometric window 32. In other words, the sample liquid can be contained easily in the channel 22 including the containing part 23, and the cylinder 11. Furthermore, the channel 22 and the cylinder 1 can be cleaned with pure water and also cleaned with the sample liquid by simply reciprocating, the piston 12 and sucking/discharging the pure cleaning wafer and the sample liquid one to several times.

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The present invention is capable of performing operations such as sampling of a sample solution, washing of the inside and co-washing, and measurement of absorbance data and infrared absorption data immediately after sampling the sample solution. The present invention relates to a cell, and a flux densitometer and a water densitometer of a cleaning liquid provided with such an absorption cell. Here, the cleaning liquid refers to a cleaning liquid for cleaning and removing the flux applied to the parts to be joined and the residual solid content thereof during the work such as soldering.

[0002]

2. Description of the Related Art In a soldering process for manufacturing a printed circuit board, for example, flux is applied to parts to be joined for the purpose of preventing the formation of oxides. Then, after the soldering work is completed, it is necessary to wash and remove this flux and its residual solid content (hereinafter, simply referred to as “flux”).

Conventionally, CFCs and trihalomethanes have been used as cleaning liquids for cleaning and removing the flux, but recently, in consideration of their environmental impact, cleaning liquids that replace CFCs (hereinafter referred to as "CFCs"). “Alternative cleaning solution”) is beginning to be used. Here, as the CFC substitute cleaning liquid used for cleaning the substrate, a hydrocarbon solvent (for example, "Solfine"), a semi-aqueous solvent (for example, "Cleansul", "pine alpha"), an alcohol solvent (for example, Methanol, ethanol, isopropyl alcohol), CFC alternatives (eg "HCF"
C225 "), a terpene solvent (for example," EC7 "),
Solvent-based cleaning liquids such as silicone-based solvents (for example, "Techno Care"); alkaline saponification type water-based cleaning liquids (for example, "Aqua cleaner" and "Sortol"), and water-based cleaning liquids such as pure water are known.

However, since the cleaning liquid for the printed circuit board or the like is usually repeatedly subjected to the cleaning treatment, the concentration of the flux in the cleaning liquid increases as the cleaning treatment is repeated. When the flux concentration exceeds a certain level, not only the cleaning ability of the cleaning liquid is lowered, but also the problem of recontamination of the printed circuit board is caused.
Therefore, in the CFC substitute cleaning liquid, it is necessary to constantly monitor the flux concentration so as to maintain the initial cleaning ability, and to replace the cleaning liquid with a new one immediately when the concentration reaches a certain value or more. Here, the measurement of the flux concentration is usually performed by instrumental analysis using the absorptiometry.

On the other hand, of the above CFC substitute cleaning liquids, the solvent-based cleaning liquid is flammable. Therefore, by containing a certain proportion of water in the cleaning liquid,
The flammability of the cleaning liquid is suppressed. However, since the flux cleaning / removal treatment is usually carried out under heating at about 60 ° C., the moisture concentration decreases due to the evaporation of moisture during the cleaning treatment, and if the moisture concentration falls below a certain level, there is a risk of ignition. Will occur. Therefore, in the solvent-based CFC alternative cleaning liquid, it is necessary to constantly monitor the water concentration in the cleaning liquid and immediately replenish the water when the water concentration becomes less than a certain level. Here, the measurement of the water concentration is usually performed by instrumental analysis using the infrared absorption method.

FIG. 4 is an explanatory view showing the basic structure of an instrument (absorptiometer) used for absorbance measurement by the absorptiometry method. In FIG. 4, 1 is a light source, 2 is an optical filter,
3 is a sample chamber, 4 is a detector, and 5 is a calculation display means. Here, the sample chamber 3 is composed of an absorption cell 6 that stores a sample liquid to be measured, and a cell holder (not shown) that holds the absorption cell 6. As the absorption cell, a material such as fused quartz or glass having a rectangular shape with a bottom or a cylindrical shape with a bottom is known.

When measuring the absorbance with an absorptiometer equipped with such an absorption cell, the absorption cell is taken out from the cell holder, and a sample solution collected by a sampling means such as a dropper is injected into the absorption cell.
The absorption cell is returned to the cell holder and measurement is started. After the measurement is completed, the absorption cell is taken out again from the cell holder, the sample solution in the absorption cell is discharged, and then the inside of the absorption cell is washed with pure water or the like.
In addition, in order to perform accurate measurement, it is also necessary to perform co-washing with the sample solution once or plural times before putting the sample solution into the absorption cell. Then, the basic configuration of the device and the measurement procedure as described above are the same in the device analysis by the infrared absorption method.

However, when measuring the absorbance data and the infrared absorption data by the equipment having the above-mentioned absorption cell, there are the following problems. (1) It is necessary to collect the sample solution to be measured by a sampling means such as a dropper and inject the sample solution into the absorption cell from this sampling means. In this case, the capacity of the absorption cell is usually several ml. Since it is as small as several tens of ml, it is extremely difficult to perform the injection operation quickly, and some skill is required. Moreover, when the outer wall of the absorption cell is contaminated by the sample liquid overflowing from the inside, this may cause a measurement error.
In particular, the flux in the cleaning liquid is not preferable because it adheres to the outer wall and produces a white residue. (2) As described above, since the capacity of the absorption cell is small, operations such as cleaning the inside of the absorption cell before and after the measurement and co-washing inside the absorption cell before the measurement are complicated and require a certain period of time. In addition, it takes time to drain the internal liquid (discharge the sample liquid and pure water for cleaning). (3) In the CFC substitute cleaning liquid, it is necessary to monitor the flux concentration and the water concentration and promptly deal with the changes in these concentrations. However, as described above, it was collected from the inside of the washing treatment tank because of complicated operations before and after the concentration measurement, such as washing and co-washing inside the absorption cell, and injecting the sample solution into the absorption cell from the sampling means. With respect to the cleaning liquid, the flux concentration and the water concentration cannot be measured immediately, so that it is not possible to quickly deal with the changes in the flux concentration and the water concentration, and the cleaning ability and safety of the CFC substitute cleaning liquid are reduced. Be damaged. In order to avoid this, it is possible to temporarily stop the cleaning process line, but this is not preferable because the cleaning process efficiency is significantly reduced.

[0009]

The present invention has been made based on the above circumstances. A first object of the present invention is to enable quick and easy operations such as sampling of a sample solution, internal washing and co-washing, and rapid detection of absorbance data / infrared absorption data and concentration measurement. It is to provide an absorption cell that can do so. A second object of the present invention is that the CFC substitute cleaning liquid collected from the cleaning treatment tank can be easily and quickly operated until the flux concentration is measured, and can be suitably used when managing the flux concentration. It is to provide a flux densitometer that can. A third object of the present invention is that the CFC substitute cleaning liquid collected from the cleaning treatment tank can be easily and quickly operated until the water concentration is measured, and can be suitably used when managing the water concentration. The purpose is to provide a moisture concentration meter that can do this.

[0010]

The absorption cell of the present invention is an absorption cell used for instrumental analysis utilizing an absorptiometric method or an infrared absorption method, and is provided with a means for collecting a sample liquid to be measured. It is characterized by being

Further, the absorption cell of the present invention includes a sample liquid suction mechanism including a cylinder and a piston, a sample liquid storage portion for storing the sample liquid sucked by the sample liquid suction mechanism, and a sample liquid storage portion. And a photometric unit provided in the sample liquid storage unit so that the absorbance data or the infrared absorption data of the sample liquid can be detected.

The absorption cell of the present invention comprises a sample liquid suction mechanism (1) comprising a cylinder (11) and a piston (12) that reciprocates in the housing of the cylinder (11).
0), the liquid collection port (21), and this liquid collection port (21)
Liquid flow path (2
2) The liquid flow path (22) is formed so that the absorbance data or infrared absorption data of the sample liquid in the liquid flow path (22) of this nozzle part (20) can be detected. And a pair of flat plate-shaped photometric windows (31, 32) which are opposed to each other with the photometric unit (30) interposed therebetween.

The flux densitometer of the present invention is a flux densitometer for measuring the concentration of the flux residue contained in the cleaning liquid which is repeatedly used for removing the flux residue by utilizing the absorptiometry. The absorption cell for measuring the absorbance data is any one of the absorption cells described above.

The moisture densitometer of the present invention is a moisture densitometer for measuring the concentration of moisture contained in a cleaning liquid repeatedly used for removing flux residues by utilizing an infrared absorption method. The absorption cell for measuring infrared absorption data is any one of the absorption cells described above.

[0015]

[Action]

(1) The sample liquid can be directly contained inside by the sample liquid sampling means. Therefore, since it is not necessary to inject the sample solution by the sampling means as in the conventional case, the sample solution can be easily collected and stored, and the detection of the absorbance data / infrared absorption data and the measurement of the concentration can be performed by a skilled person. But it can be done quickly. Further, since the problem of the conventional absorption cell that the outer wall is contaminated by the overflowing sample liquid does not occur, the measurement error due to this does not occur. (2) The sample liquid suction mechanism including the cylinder and the piston makes it easy to store the sample liquid in the sample liquid storage portion, and does not require the skilled person to detect the absorbance data / infrared absorption data and measure the concentration. But it can be done quickly. In addition, the pure water for cleaning and the sample liquid are sucked and discharged about once to several times by reciprocating the piston which constitutes the sample liquid suction mechanism, and the cleaning and co-cleaning in the sample liquid container (in the liquid flow path) are performed. The washing is done reliably. Therefore, the cleaning operation can be speeded up and facilitated. Furthermore, since the sample liquid and pure water remaining in the sample liquid storage portion (in the liquid flow path) are forcibly discharged by the piston, there is no time loss due to the liquid running out slowly. (3) Since the operations required for detecting the absorbance data (washing, co-washing, storage of sample solution) can be performed easily and quickly, the flux concentration in the CFC substitute cleaning solution collected from the cleaning tank can be quickly measured. Can be measured at any time, and immediately responds to changes in flux concentration (replacement of cleaning liquid)
can do. Therefore, there is no need to temporarily stop the cleaning process line when measuring the concentration. Further, unlike the conventional case, the white residue due to the flux does not adhere to the outer wall of the absorption cell, and this does not cause a measurement error. (4) Since the operation required to detect infrared absorption data can be performed simply and quickly, the water concentration in the CFC substitute cleaning liquid sampled from the cleaning treatment tank can be measured quickly. Therefore, it is possible to immediately deal with the change in the water concentration (supplement of water), and it is possible to sufficiently secure the safety without temporarily stopping the cleaning process line when measuring the concentration. (5) Distance between a pair of flat plate-shaped photometric windows forming the photometric unit,
That is, the length of the liquid layer through which light is transmitted can be reduced, which enables concentration measurement over a wide range.

[0016]

EXAMPLES Examples of the present invention will be described below. <Absorption Cell> FIG. 1 is an explanatory view showing an example of the absorption cell of the present invention, in which (a) is a front view and (b) is A in (a).
FIG.

In the figure, 10 is a sample suction mechanism, and this sample suction mechanism 10 is composed of a cylinder 11 and a piston 12. 13 is a cylinder 11
It is a shaft for moving the piston 12 up and down in the inside, and a finger hanging metal fitting 14 is connected and fixed to the upper end of the shaft 13.

Reference numeral 20 denotes a nozzle portion, and this nozzle portion 20
Is liquid-tightly connected to the sample suction mechanism 10 by being screwed onto the lower end of the cylinder 11 via an O-ring. Reference numeral 21 is a liquid sampling port, and 22 is a liquid flow path formed in the nozzle portion 20 so as to communicate with the inside of the cylinder 11. The sample liquid sucked from the liquid sampling port 21 by the sample suction mechanism 10 rises in the liquid flow path 22 and moves to the cylinder 11
Be introduced inside.

Reference numeral 23 is a liquid storage portion formed of a cylindrical space formed in the middle of the liquid flow path 22. 24 and 25 are
Each is a cylindrical recess formed on the side surface of the nozzle portion 20, and the peripheral surface of the cylindrical recess 24, 25 is threaded.

The photometric unit 30 has a pair of disc-shaped photometric windows 31 and 32 that are arranged opposite to each other with the liquid storage unit 23 in between, and holding members 34 and 35 for holding and fixing these.

The disc-shaped photometric windows 31 and 32 are made of fused quartz, glass or the like. The outer peripheral surface of the holding member 34 (35) is threaded so that the cylindrical recess 24
The disk-shaped photometric window 31 (32) is pressed and held inward by being screwed with the peripheral surface portion of (25).

In this embodiment, ultraviolet rays, visible rays, and
Light such as infrared rays enters from the disc-shaped photometric window 31 side, and the light transmitted through the sample liquid passes through the disc-shaped photometric window 32 and is received by the detector. Thereby, the absorbance data and the infrared absorption data are detected. The gap between the disc-shaped photometric window 31 and the disc-shaped photometric window 32, that is, the length of the liquid layer through which light is transmitted is 10 mm or less, for example 2.0 mm, which is extremely narrow. As a result, a calibration curve having excellent linearity can be measured over a wide concentration range, and the reliability of measurement results can be improved.

According to the absorption cell of this embodiment, the following effects are obtained. By the sample liquid suction mechanism 10 including the cylinder 11 and the piston 12, the liquid flow path 22 including the liquid storage portion 23 is provided.
The operation of accommodating the sample liquid in the cylinder and the cylinder 11 can be easily performed, and the absorbance data and infrared absorption data can be detected and the concentration can be quickly measured without the need of an expert. The outer surfaces of the disc-shaped photometric windows 31 and 32 are not contaminated by the sample liquid, and the measurement error due to this does not occur. The liquid flow path 22 can be obtained by reciprocating the piston 12 and suctioning and discharging pure water for cleaning or sample liquid once or several times.
The inside and the inside of the cylinder 11 are reliably washed and co-washed. Therefore, the cleaning operation can be speeded up and facilitated. Since the sample liquid and pure water remaining in the liquid flow path 22 and the cylinder 11 are forcibly discharged by the piston 12, there is no time loss due to the liquid running out slowly. Since the gap between the disc-shaped photometric window 31 and the disc-shaped photometric window 32 (the length of the liquid layer through which light passes) is narrow, it is possible to measure a calibration curve having excellent linearity over a wide concentration range. Therefore, the reliability of the measurement result can be improved.

<Flux Densitometer> FIG. 2 is an explanatory view showing the outline of the flux densitometer of the present invention. This flux densitometer is composed of an absorption photometric sensor section A and a calculation display section B. In the absorption photometric sensor section A,
Reference numeral 50 is an absorption cell having the same configuration as that of the above embodiment, 51 is a visible light emitting light source including a blue light emitting diode or a green light emitting diode, 52 is a lens, 53 is an interference filter, and 54
Is an incident light intensity detector consisting of a silicon diode, 55
Is a transmitted light intensity detector made of a silicon diode. On the other hand, in the calculation display section B, 56 is a calculation means, 5
Reference numeral 7 is a display means.

According to the flux densitometer of the present embodiment, the washing, co-washing and sample liquid accommodating operations necessary for detecting the absorbance data can be performed easily and quickly, and the fluorocarbon collected from the washing treatment tank can be used. The flux concentration in the alternative cleaning liquid can be measured quickly. Then, when the flux concentration reaches a value equal to or higher than a certain value, it is possible to immediately deal with replacing the cleaning liquid with a new one. In addition, the outer surface of the disk-shaped photometric window of the absorption cell 50 is not contaminated by the flux in the CFC substitute cleaning liquid, and the white residue does not adhere to it, so that a measurement error due to this does not occur.

The flux densitometer of this embodiment is also characterized in that it utilizes the absorption characteristics of visible light. According to the flux densitometer having such characteristics, the visible light emitting light source 51 including the blue light emitting diode and the green light emitting diode, which has a simple structure and is relatively inexpensive.
The flux concentration in the CFC substitute cleaning liquid can be accurately measured by the absorptiometric sensor including an inexpensive transmitted light intensity detector 55 made of a silicon diode or the like.

<Moisture Concentration Meter> FIG. 3 is an explanatory view showing the outline of the moisture concentration meter of the present invention. This moisture concentration meter includes an infrared absorption sensor section C and a calculation display section D. In the infrared absorption sensor section C, 60 is an absorption cell having the same configuration as that of the above-mentioned embodiment, 61 is an infrared radiation light source composed of an incandescent lamp or a halogen lamp, 62 is a lens,
63 is an infrared interference filter, 64 is an incident light intensity detector made of a photoconductive element, 65 is a transmitted light intensity detector made of a photoconductive element, and 66 is a rotary plate for chopping the light from the infrared radiation source 61. , 67 are drive motors for the rotary plate 66. On the other hand, in the calculation display section D, 68 is a calculation means and 69 is a display means.

According to the moisture concentration meter of this embodiment, the washing, co-washing, and sample liquid accommodating operations required for detecting infrared absorption data can be performed easily and quickly, and the moisture concentration was measured from the washing treatment tank. It is possible to quickly measure the water concentration in the CFC substitute cleaning liquid. Then, when the water concentration falls below a certain level, it is possible to take measures to immediately replenish the water, and sufficient safety can be ensured.
Further, by narrowing the gap between the two disc-shaped photometric windows that form the absorption cell 60, it is possible to measure a calibration curve with excellent linearity and improve the reliability of the measurement results. it can.

[0029]

EFFECT OF THE INVENTION According to the absorption cell of the present invention, the sample liquid can be easily collected and stored, and the absorbance data and infrared absorption data can be detected and the concentration can be quickly measured without the need of an expert. be able to. Further, unlike the conventional case, the outer wall of the absorption cell is not contaminated, so that a measurement error due to this does not occur. According to the flux densitometer of the present invention, the flux concentration in the CFC substitute cleaning liquid collected from the cleaning treatment tank can be quickly measured, and the change in the concentration can be immediately dealt with (exchange of the cleaning liquid). . Therefore, it is not necessary to stop the cleaning process line when measuring the concentration. According to the moisture concentration meter of the present invention, it is possible to quickly measure the moisture concentration in the CFC substitute cleaning liquid collected from the cleaning treatment tank, and immediately deal with the change in the concentration (replenishment of moisture). . Therefore, it is possible to sufficiently secure the safety without temporarily stopping the cleaning process line when measuring the concentration.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of an absorption cell of the present invention,
(A) is a front view, (B) is a sectional view taken along line AA in (A).

FIG. 2 is an explanatory diagram showing an outline of a flux concentration meter of the present invention.

FIG. 3 is an explanatory diagram showing an outline of a moisture concentration meter of the present invention.

FIG. 4 is an explanatory diagram showing a basic configuration of an apparatus used for measuring absorbance by an absorptiometry method.

[Explanation of symbols]

10 Sample Suction Mechanism 11 Cylinder 12 Piston 13 Shaft 14 Metal Fitting for Finger 20 Nozzle Part 21 Liquid Collection Port 22 Liquid Flow Path 23 Liquid Storage Part 24 Cylindrical Recess 25 Cylindrical Recess 30 Photometric Section 31 Disc-shaped Photometric Window 32 Circular Plate-shaped photometric window 34 Holding member 35 Holding member 50 Absorption cell 51 Visible light emission light source 52 Lens 53 Interference filter 54 Incident light intensity detector 55 Transmitted light intensity detector 56 Calculation means 57 Display means 60 Absorption cell 61 Infrared radiation light source 62 Lens 62 Infrared interference filter 64 Incident light intensity detector 65 Transmitted light intensity detector 66 Rotating plate 67 Drive motor 68 Computing means 69 Display means

Claims (5)

[Claims] 1. An absorption cell used for instrumental analysis utilizing an absorption spectrophotometric method or an infrared absorption method, which is equipped with a means for collecting a sample liquid to be measured. 2. A sample liquid suction mechanism composed of a cylinder and a piston, a sample liquid storage unit which stores the sample liquid sucked by the sample liquid suction mechanism, and an absorbance of the sample liquid stored in the sample liquid storage unit. The absorption cell according to claim 1, further comprising a photometric unit provided in the sample liquid storage unit so that data or infrared absorption data can be detected. 3. A sample liquid suction mechanism (10) comprising a cylinder (11) and a piston (12) which reciprocates in the housing of the cylinder (11), a liquid sampling port (21), and this liquid sampling. About the nozzle part (20) in which the liquid flow path (22) from the mouth (21) to the housing of the cylinder (11) is formed, and the sample liquid in the liquid flow path (22) of this nozzle part (20) In order to be able to detect the absorbance data or infrared absorption data of, a photometric unit (30) having a pair of flat plate-shaped photometric windows (31, 32) facing each other across the liquid channel (22) is provided. The absorption cell according to claim 1, wherein 4. A flux densitometer for measuring the concentration of a flux residue contained in a cleaning liquid repeatedly used for removing a flux residue by using an absorptiometry method for measuring absorbance data. A flux densitometer, wherein the absorption cell for achieving the above is the absorption cell according to any one of claims 1 to 3. 5. A moisture densitometer for measuring the concentration of moisture contained in a cleaning liquid, which is repeatedly used for removing flux residues, by using an infrared absorption method, wherein infrared absorption data is obtained. An absorption cell for measurement is the absorption cell according to any one of claims 1 to 3, wherein a moisture concentration meter is provided.