WO2013180245A1 - Viscosimètre - Google Patents

Viscosimètre Download PDF

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Publication number
WO2013180245A1
WO2013180245A1 PCT/JP2013/065109 JP2013065109W WO2013180245A1 WO 2013180245 A1 WO2013180245 A1 WO 2013180245A1 JP 2013065109 W JP2013065109 W JP 2013065109W WO 2013180245 A1 WO2013180245 A1 WO 2013180245A1
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WO
WIPO (PCT)
Prior art keywords
fluid
viscometer
gas
needle
container
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Application number
PCT/JP2013/065109
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English (en)
Japanese (ja)
Inventor
雅弘 大澤
Original Assignee
天竜精機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 天竜精機株式会社 filed Critical 天竜精機株式会社
Priority to CN201380023089.7A priority Critical patent/CN104272085B/zh
Priority to JP2014518740A priority patent/JP6086907B2/ja
Publication of WO2013180245A1 publication Critical patent/WO2013180245A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
    • G01N11/02—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material
    • G01N11/04—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material through a restricted passage, e.g. tube, aperture
    • G01N11/08—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material through a restricted passage, e.g. tube, aperture by measuring pressure required to produce a known flow

Definitions

  • the present invention relates to a technique effective when applied to a viscometer.
  • Patent Document 1 JP-A-9-329539
  • Patent Document 2 JP-A-9-329539
  • Patent Document 3 JP-A-9-329539
  • Patent Document 2 JP-A-9-329539
  • Patent Document 3 describes a technique related to a capillary viscometer for measuring the viscosity of a liquid.
  • Patent Document 2 describes a technique for measuring the plasticity of a fluid dough using a capillary viscometer.
  • a capillary viscometer can measure a viscosity characteristic (also referred to as a fluid characteristic) from a relationship between a pressure applied to the fluid and a flow rate at that time by allowing the fluid to be measured to pass through the capillary (for example, see paragraphs [0021]-[0024] in the specification of Patent Document 2.)
  • a viscosity characteristic also referred to as a fluid characteristic
  • the dispersion fluid has a Newtonian fluid (also referred to as Newtonian liquid) and a non-Newtonian fluid (non-Newtonian fluid) depending on the relationship between shear rate (also referred to as shear rate) and shear stress (also referred to as shear stress) (that is, viscosity characteristics). It is also classified as liquid.) If the shear rate and shear stress are in a proportional relationship, it is a Newtonian fluid (viscosity characteristics indicate Newtonian characteristics), and if it is not in a proportional relationship, it is a non-Newtonian fluid (viscosity characteristics indicate, for example, thixotropic characteristics). .
  • a capillary viscometer has an existing concept that it is not suitable for measuring the viscosity characteristics of a non-Newtonian fluid, unlike a torque type that can be measured while rotating a dispersed fluid. This is because, when a capillary type is used, clogging of solid particles occurs in a micro flow channel where the size of solid particles cannot be ignored (that is, the capillaries are small in diameter), so the viscosity characteristic of the dispersion fluid is the size of the solid particles. (Hereinafter, also referred to as size dependency of solid particles with respect to the dispersion fluid channel).
  • the manufacturer of the dispersion fluid provides the viscosity characteristics under a predetermined condition in the product specification, but the viscosity characteristics matching the use conditions of the user who uses the dispersion fluid are not described. It is common. As described above, the viscosity characteristic provided by the manufacturer is considered to have been measured using a torque viscometer.
  • the viscometer described in Patent Document 2 measures the viscosity characteristics from the flow rate at that time (that is, the flow rate of the fluid itself) by allowing the fluid to be measured to pass through the capillary (capillary tube).
  • the fluid discharged from the capillary inevitably remains (attaches) to the capillary tip, in order to directly measure the flow rate of the fluid more accurately, it is necessary to remove the fluid remaining at the capillary tip. . For this reason, there is a need for a viscometer having a simple configuration without providing a mechanism for removing the residual fluid.
  • An object of the present invention is to provide a viscometer that measures the viscosity characteristics of a fluid with a simple configuration.
  • the viscometer according to the present invention is a container that contains a fluid, a gas unit that communicates with the container and sends a gas that presses the fluid into the container, and communicates with the container and is pressed with the gas.
  • a measuring needle for discharging the fluid, and a computer unit including a calculation function for calculating a viscosity characteristic of the fluid from a gas pressure and a gas flow rate when the fluid is pressed are provided.
  • the viscosity characteristic of the fluid can be measured by regarding the gas flow rate as the fluid flow rate, and the viscometer can be simply configured because the fluid flow rate is not directly measured.
  • the viscometer according to the present invention includes a plurality of needles having different inner diameters, which are selected as the measurement needles, and calculates the viscosity characteristics of the fluid in each of the plurality of needles by the calculation function, It is preferable to measure the dependent viscosity properties of the fluid.
  • the gas unit includes a regulator for adjusting the gas pressure and a flow meter for measuring the gas flow rate, and the calculation function changes the gas pressure by the regulator. It is preferable to calculate the viscosity characteristic of the fluid from the change in the gas flow rate.
  • the measurement accuracy of the viscometer can be determined from the measurement accuracy of the regulator and the flow meter. Further, it is possible to provide a viscometer that is less expensive than a viscometer including a mass flow controller.
  • the gas unit includes a mass flow controller that adjusts the gas flow rate, and a pressure gauge that measures the gas pressure, and the calculation function is configured to control the gas flow rate by the mass flow controller. It is preferable to calculate the viscosity characteristic of the fluid from the change in the gas pressure when the pressure is changed.
  • the measurement accuracy of the viscometer can be determined from the measurement accuracy of the mass flow controller and the pressure gauge.
  • a viscometer with higher accuracy than a viscometer equipped with a regulator can be provided.
  • the measuring needle is replaced as a needle to be cleaned, and a cleaning adapter is provided for supplying the solvent into the needle to be cleaned and cleaning the needle to be cleaned.
  • the measurement needle after the measurement that is, the fluid remaining in the needle to be cleaned can be removed.
  • the number of components is limited to that specific number unless otherwise specified or in principle limited to a specific number in principle. It may be more than a specific number or less.
  • the shape of a component, etc. it shall include substantially the same or similar to the shape, etc., unless explicitly stated or in principle otherwise considered otherwise .
  • FIG. 1 is a diagram for explaining the configuration of the viscometer 10.
  • 2 to 8 are views for explaining an assembly configuration of the viscometer 10.
  • FIG. 1 is a diagram for explaining the configuration of the viscometer 10.
  • FIGS. 2 to 7 show a state in which the front cover 51 (see FIG. 8) is removed from the main body 50 by the snap lock 61 and the rotating cover 52 is opened by the hinge 62.
  • 3 shows a state in which the upper surface cover 55 (see FIG. 6) of the needle storage case 54 is removed.
  • 4 to 7 show a state where the sensor cover 53 (see FIG. 2) is removed.
  • the viscometer 10 includes rubber feet 56 provided at the four corners of the bottom of the main body 50 equipped with various devices, and a handle 60 provided on the upper portion of the main body 50, and can be measured stably. At the same time, it has excellent portability (see FIG. 8).
  • the viscometer 10 in this embodiment is a capillary type that measures the viscosity characteristics of the fluid 13 by pressing the fluid 13 and discharging it from the measuring needle 11A (capillary tube).
  • the fluid 13 is a dispersion fluid in which solid particles (for example, a thixotropic agent) are dispersed in a resin part (for example, a polymer material).
  • the fluid 13 is hatched for the sake of clarity.
  • the viscometer 10 includes a plurality of needles 11 having different inner diameters ⁇ selected as measurement needles 11 ⁇ / b> A, and a container 12 in which the measurement needles 11 ⁇ / b> A are attached (attached) in communication and contain a fluid 13. ing.
  • the plurality of needles 11 are housed in a needle housing case 54, and the selected needle 11 (becomes a measurement needle 11 ⁇ / b> A) is taken out and attached to the container 12.
  • Examples of the plurality of needles 11 include an inner diameter ⁇ of 1.60 mm, 1.37 mm, 1.19 mm, 1.07 mm, 0.84 mm, 0.69 mm, 0.60 mm, 0.51 mm, 0.41 mm,. 13 pieces different from 34 mm, 0.26 mm, 0.21 mm, and 0.18 mm are prepared.
  • the inner diameter ⁇ of the measuring needle 11 is referred to in calculating the viscosity characteristic of the fluid 13 to be measured.
  • the length L of each needle 11 is 20 mm, for example.
  • the inner diameter ⁇ (0.18 to 1.60 mm), the length L (20 mm), and the number (13) of the needle 11 are not limited to these.
  • each needle 11 is used as a capillary tube where capillary action occurs.
  • the other end of each needle 11 can be screwed so as to be attached in communication with the container 12.
  • one selected from the plurality of needles 11 can be easily attached to and removed from the container 12 as the measurement needle 11A. That is, the plurality of needles 11 can be easily exchanged.
  • the container 12 has a syringe shape, and a small-diameter tip (one end) is connected to and connected to the measurement needle 11 ⁇ / b> A, and a large-diameter other end is connected to the measurement adapter 15. Inside the container 12, the fluid 13 packed and stored at the distal end side is pressed by the plunger 16.
  • the plunger 16 is pressed and moved by the air supplied by adjusting the pressure (indicating the pressure value P) into the container 12 from the other end (upper) side of the container 12. For this reason, the container 12 and the measuring adapter 15 are connected in communication so that air is supplied to the inside of the container 12.
  • the pressure value P of the air supplied into the container 12 is also the pressure value P that presses the fluid 13, and is referred to in calculating the viscosity characteristic of the fluid 13 to be measured.
  • the measuring adapter 15 is connected to the air supply source 20 by an air flow path AD1 in order to receive air supply from an air supply source 20 (for example, a maximum of 400 kPa).
  • the viscometer 10 includes an electropneumatic regulator 21, an electromagnetic valve 22, and a pressure gauge 23 provided in the middle of the air flow path AD1.
  • the power supply of the viscometer 10 including the electropneumatic regulator 21 is performed by turning on and off the main power switch 63 (see FIG. 2).
  • the electropneumatic regulator 21 adjusts the pressure value P of air supplied into the container 12, that is, adjusts the pressure value P that presses the fluid 13.
  • the electromagnetic valve 22 opens and closes the air flow path AD1.
  • the pressure gauge 23 is provided downstream of the electropneumatic regulator 21 and measures the pressure value P of the air supplied into the container 12. The measured value (pressure value P) of the pressure gauge 23 can be displayed on the display device 64.
  • the viscometer 10 includes an area sensor 30 (see FIG. 4) configured to include photoelectric sensors 25 and 26 (see FIG. 1) provided on the distal end side of the measuring needle 11A, and a sensor that covers the area sensor 30. And a cover 53 (see FIG. 2).
  • the photoelectric sensors 25 and 26 are composed of a light receiving part and a light emitting part. The photoelectric sensors 25 and 26 detect changes as a signal when the measurement target passes between the light receiving unit and the light emitting unit and the light from the light emitting unit is blocked.
  • the sensor cover 53 is provided with a window portion 53a through which the tip of the measuring needle 11A passes.
  • the photoelectric sensor 25 and the photoelectric sensor 26 are provided apart from each other by a certain distance D (for example, 10 mm). That is, the photoelectric sensor 25 is provided at the starting point of the interval D of the fluid 13 discharged from the measuring needle 11A, and the photoelectric sensor 26 is provided at the end point of the interval D.
  • the interval D (10 mm) is not limited to this.
  • the area sensor 30 measures the passage time T of the fluid 13 discharged from the measuring needle 11A with the photoelectric sensors 25 and 26 as a pair.
  • the measurement signals from the paired photoelectric sensors 25 and 26 are converted to a passage time T through which the fluid 13 passes by being referred to in synchronization by the computer unit 14. Since the viscometer 10 is provided with the sensor cover 53, the influence of disturbance (for example, air flow) can be reduced when the passage time T of the fluid 13 is measured by the area sensor 30, and the accuracy can be improved. Measurement results can be obtained.
  • the passage time T is referred to in calculating the apparent flow rate Q ′ of the fluid 13 discharged from the measuring needle 11A.
  • the apparent flow rate Q ' indicates a value calculated by the time T during which the fluid 13 passes between a pair of photoelectric sensors 25 and 26 having a constant interval and the inner diameter ⁇ of the measuring needle 11A.
  • the flow path diameter (also referred to as discharge diameter) of the fluid 13 is the inner diameter of the measuring needle 11.
  • the degree of contraction flow is determined by the solid particles contained in the fluid 13.
  • the viscometer 10 is configured to calculate (measure) the viscosity characteristics of the fluid 13 by the computer unit 14 with reference to the apparent flow rate Q ′. For this reason, the viscometer 10 has a simple configuration that does not require measurement of the actual flow path diameter of the fluid 13.
  • the photoelectric sensors 25 and 26 constituting the area sensor 30 are connected to the computer unit 14 through a signal line via an interface module 24.
  • the electropneumatic regulator 21, the electromagnetic valve 22, and the pressure gauge 23 described above are also connected to the computer unit 14 through a signal line via the interface module 24.
  • the computer unit 14 provided in the viscometer 10 has an apparent flow rate Q of the fluid 13 discharged from the measuring needle 11A when the pressure value P is changed by the electropneumatic regulator 21 (for example, in the range of 40 kPa to 100 kPa). Includes a calculation function to calculate '.
  • a control signal for adjusting the air supply amount is output to the electropneumatic regulator 21 (for example, 0 to 5V output). Further, a control signal for opening and closing the air flow path is output from the computer unit 14 to the electromagnetic valve 22. Then, the measurement signal of the pressure value P is input from the pressure gauge 23 (for example, 1 to 5 V input) to the computer unit 14.
  • measurement signals are input (digital input) from the photoelectric sensors 25 and 26 to the computer unit 14.
  • Sensor amplifiers 25A and 26A for amplifying signals are provided in the middle of the signal line connecting the computer unit 14 and the photoelectric sensors 25 and 26.
  • the measurement signals from the photoelectric sensors 25 and 26 that are paired in this way are converted into a passage time T through which the fluid 13 passes by being referred to in synchronization by the computer unit 14.
  • the calculation function of the computer unit 14 is based on the pressure value P, the passage time T, and the apparent flow rate Q ′ of the fluid 13 discharged from the measuring needle 11A, and the fluid 13 has the inner diameter ⁇ of the measuring needle 11 as the channel diameter of the fluid 13. Viscosity characteristics are calculated.
  • the viscometer 10 is an apparatus that can measure the apparent flow rate Q ′ passing through the measuring needle 11A by adding air with the pressure value P controlled through the container 12 to the fluid 13. It is.
  • the viscometer 10 includes a computer unit 14 that obtains a rheological equation from the measured data (direct pressure value P, apparent flow rate Q ′) and determines viscosity characteristics (shear rate ⁇ shear stress characteristics). Yes.
  • a laptop computer connected to the main body 50 by a connection cable (signal line) can be used as the computer unit 14 of the viscometer 10.
  • the computer unit 14 can also be connected inside the main body 50.
  • the viscosity characteristic of the fluid 13 can be calculated by measuring the pressure value P of the air applied to the fluid 13 in the container 12 and the apparent flow rate Q ′.
  • n is the nth power of the power law
  • ⁇ 0 is the viscosity of the resin part (solvent)
  • R is the radius of the inner diameter ⁇ of the measuring needle 11A
  • L is the length of the measuring needle 11A.
  • Equation (2) holds because the contracted flow is uniquely determined by the n value of the dispersed fluid.
  • the air pressure value ( ⁇ P) is taken on the horizontal axis
  • the apparent flow rate (Q ′) is taken on the vertical axis
  • plotted on a log-log graph and a straight line is obtained.
  • the n value of the fluid 13 can be determined.
  • the shear stress ⁇ w and the shear rate ⁇ w on the wall surface of the measuring needle 11A are expressed by the following equations (4) and (5).
  • ⁇ w ⁇ (3n + 1) / n ⁇ Q / ⁇ R 3 (5)
  • the viscosity characteristic ( ⁇ w ⁇ w characteristic) of the fluid 13 to be measured is calculated by the computer unit 14.
  • various shear speeds ⁇ w and shear stress ⁇ w are calculated from the various air pressure values P and the apparent flow rate Q ′ by the computer unit 14, and the viscosity of the fluid 13 to be measured is measured by the viscometer 10. Characteristics will be measured. Further, when the viscosity characteristic of the fluid 13 is measured, the viscosity value, the thixo index, and the yield value at each shear rate ⁇ w, which are index values of the fluid 13, (the shear rate ⁇ w indicated by the arrow in FIG. 9 is 0). The value of the shear stress ⁇ w at the time can also be calculated.
  • the needle 11 (measuring needle 11A) having a different needle inner diameter ⁇ (for example, 1.60 mm, 1.07 mm) is applied to the same fluid 13 (for example, one having an average size of solid particles of about 30 ⁇ m).
  • Examples of viscosity characteristics ( ⁇ w- ⁇ w characteristics) measured by using are shown in FIGS. 9 and 10 are diagrams for explaining an example of the viscosity characteristic of the fluid 13. 9 shows the viscosity characteristics when the needle inner diameter ⁇ is 1.60 mm, and FIG. 10 shows the viscosity characteristics when the needle inner diameter ⁇ is 1.07 mm.
  • the viscosity characteristics in FIG. 9 show normal thixotropic characteristics (non-Newtonian characteristics), while the viscosity characteristics in FIG. 10 show Newton characteristics. These viscosity characteristics are clearly different depending on the needle inner diameter ⁇ even in the same fluid 13.
  • the result shown in FIG. 10 is that the size of the solid particles contained in the fluid 13 is larger than the flow path diameter (needle inner diameter ⁇ ) of the fluid 13, causing a clogging phenomenon in the measuring needle 11 ⁇ / b> A. It is thought that only the resin part flowed. For example, in the semiconductor manufacturing field, when cream solder (dispersed fluid) is printed, if the opening of the printing mask becomes smaller, the resin portion will have poor bleeding, but the measurement results shown in FIGS. 9 and 10 show this phenomenon. Explain well.
  • FIG. 11 is a diagram for explaining an example of the viscosity characteristic of the fluid 13.
  • FIG. 11 shows the thixotropic characteristic similar to that shown in FIG. This is considered to be due to thixotropic characteristics, even when the clogged needle inner diameter ⁇ is reduced by reducing the average size of the solid particles of the fluid 13. From this, it can be seen that the reason why the viscosity characteristic in FIG. 10 is obtained as the Newton characteristic is due to the size of the solid particles of the fluid 13.
  • the viscometer 10 calculates the viscosity characteristics of the fluid 13 in each of the plurality of needles 11 by the calculation function of the computer unit 14, and the inner diameter ⁇ of the needle 11 is used as the channel diameter of the fluid 13 and depends on the channel diameter.
  • the viscosity characteristic of the fluid 13 can be measured.
  • the viscosity characteristics when the flow path diameter of the fluid 13 is changed can be obtained. Therefore, the influence of the size of the solid particles of the fluid 13 on the flow path of the fluid 13, that is, the size dependency of the solid particles on the dispersed fluid flow path can be measured.
  • the computer unit 14 may include an extraction function for extracting the inner diameter ⁇ of the needle 11 exhibiting the thixotropic characteristic before the viscosity characteristic of the fluid 13 changes from the thixotropic characteristic to the Newton characteristic.
  • an extraction function for extracting the inner diameter ⁇ of the needle 11 exhibiting the thixotropic characteristic before the viscosity characteristic of the fluid 13 changes from the thixotropic characteristic to the Newton characteristic.
  • the plurality of needles 11 are exchanged from one having a large needle inner diameter ⁇ to one having a small needle inner diameter ⁇ .
  • the pressure value P is changed in the range of 40 kPa to 100 kPa, for example, and the viscosity characteristic is calculated (measured) from the measurement result.
  • each of the viscosity characteristics indicates a thixotropic characteristic when the needle inner diameter ⁇ is larger, and a Newton characteristic when the needle inner diameter ⁇ is smaller.
  • the viscosity characteristic changes from the thixotropic characteristic to the Newton characteristic.
  • the computer unit 14 changes from the thixotropic characteristic to the Newton characteristic. Extract the previous inner diameter ⁇ (1.19 mm).
  • the fluid 13 it is possible to specify the range in which the fluid 13 can be used in the state of thixotropic characteristics. That is, if the flow path diameter is equal to or larger than the needle inner diameter (1.19 mm in the case of the example) extracted by the computer unit 14, it can be specified that the fluid 13 is in a thixotropic characteristic state. As a specific application example, it is possible to determine whether or not the cream solder as the fluid 13 is embedded in the opening (flow path diameter) of the printing mask with no bleeding defect by using the viscometer 10 when performing cream solder printing. It becomes easy.
  • such a viscometer 10 includes blowers 31 and 32 for injecting air to the tip of the measuring needle 11A from an oblique direction with respect to the direction in which the fluid 13 is discharged from the measuring needle 11A. It may be.
  • blowers 31 and 32 are needle-shaped, and one end thereof is directed to the tip of the measurement needle 11A.
  • the blowers 31 and 32 receive the air supply from the air supply source 20, the other ends are connected to the air supply source 20 and the air flow path AD2.
  • a manual regulator 33 for adjusting the air pressure (for example, 400 kPa) of the air supply source 20 and an electromagnetic valve 34 for opening and closing the air flow path AD2 communicating with the container 12 are provided.
  • the electromagnetic valve 34 is connected to the computer unit 14 via a signal line via the interface module 24.
  • a control signal for opening and closing the air flow path AD ⁇ b> 2 is output from the computer unit 14 to the electromagnetic valve 34.
  • the electromagnetic valve 34 When the electromagnetic valve 34 is opened, air is supplied into the blower 31 from the other end of the blower 31, and the blower 31 is ejected from one end of the blower 31 to remain at the tip of the measurement needle 11 ⁇ / b> A after measurement.
  • the fluid 13 that has been removed can be removed.
  • the blower 32 can remove the fluid 13 remaining at the tip of the measurement needle 11 ⁇ / b> A. The removal of the remaining fluid 13 is performed every time the apparent flow rate Q ′ is calculated (measured) by changing the pressure value P, whereby a highly accurate result can be obtained.
  • the remaining fluid 13 can be thrown away in one direction while being sandwiched. Since this one direction is the direction in which the fluid 13 is discharged from the measuring needle 11A, the remaining fluid 13 can be removed without adhering to the area sensor 30.
  • the viscometer 10 includes a cleaning adapter 35 in which the measuring needle 11A is replaced as the needle to be cleaned 11B, and a solvent is supplied into the needle 11B to be cleaned to clean the needle 11B to be cleaned.
  • the cleaning adapter 35 supplies a solvent into a container 12A of the same type as the container 12, supplies air to a plunger that presses the solvent, and removes the remaining fluid 13 for cleaning.
  • the cleaning adapter 35 can be regarded as a configuration including the container 12A.
  • the remaining fluid 13 may be simply cleaned and removed by supplying air directly into the needle 11B to be cleaned.
  • the cleaning adapter 35 is connected to the air supply source 20 by an air flow path AD3 in order to receive air supply from the air supply source 20.
  • a manual regulator 36 for adjusting the air pressure (for example, 400 kPa) of the air supply source 20 and an electromagnetic valve 40 for opening and closing the air flow path AD3 communicating with the cleaning adapter 35 are provided.
  • the electromagnetic valve 34 is connected to the computer unit 14 via a signal line via the interface module 24. From the computer unit 14, a control signal for opening and closing the air flow path AD3 is output to the electromagnetic valve 34 (digital output).
  • the cleaning adapter 35 supplies air to the needle 11B to be cleaned through the container 12A, and remains in the measuring needle 11A after measurement, that is, the needle 11B to be cleaned.
  • the fluid 13 can be removed and washed.
  • the cleaned needle 11 (the needle to be cleaned 11B) is stored in the needle storage case 54 (see FIG. 3).
  • a simple fluid composed only of a dispersion fluid and a resin part is adhesiveness.
  • the adhesive force of the fluid can be measured with a so-called tack tester, for example.
  • This tack tester applies the fluid to be measured to the fixed plate, presses the fluid to be measured with the movable rod, and then pulls the movable rod away from the fixed plate to destroy the fluid to be measured.
  • the force at the time of measuring is measured, and the value is measured as the adhesive strength.
  • this measurement object is considered to measure not the adhesive force of the fluid but the deformation resistance at which the fluid to be measured is deformed when the movable rod is pulled up.
  • the viscometer 10 described in the first embodiment can measure the stress at which the fluid 13 starts to flow, that is, the yield value. Considering this value physically, it can be seen that this is nothing but the stress when the fluid 13 flows, that is, the adhesive force of the fluid to the wall surface of the needle 11. Thus, by using the viscometer 10, the adhesive strength of the fluid 13 can also be measured.
  • the needle 11 is replaceable. For this reason, for example, if the viscosity characteristic is measured using the needle 11 having a different surface roughness inside the needle, it is possible to obtain information on how the flow characteristic of the fluid 13 changes depending on the surface state. Become.
  • cream solder used in the semiconductor manufacturing field is one of the dispersed fluids.
  • Cream solder uses solder powder as solid particles and flux as a resin part. This cream solder is widely used in surface mounting technology, and is printed and applied onto a pad of a printed circuit board using a dedicated printing machine.
  • the size of parts is decreasing year by year in order to improve the mounting density.
  • an extremely small electronic component of 0.3 mm ⁇ 0.15 mm has been developed by an electronic component manufacturer.
  • the width of the cream solder printed on the substrate pad is about 0.1 mm.
  • the size of the solder powder used for the cream solder is, for example, at least 10 ⁇ m. That is, the size of the solid particles as described in the first embodiment is at a level that directly affects the flow characteristics.
  • the viscometer 10 includes a container 12 that houses a fluid 13, and a measurement needle 11 ⁇ / b> A (needle 11) that communicates with the container 12 and discharges the fluid 13 that is pressed with gas.
  • the container 12 has a syringe shape, and has a small-diameter tip (one end) connected to the measurement needle 11 ⁇ / b> A and a large-diameter other end connected to the measurement adapter 15.
  • the measurement adapter 15 is connected to the air supply source 20 by the air flow path AD1 in order to receive the air supply from the air supply source 20.
  • the fluid 13 packed and accommodated at the front end side is pressed by the air sent from the air flow path AD1 via the plunger 16.
  • the structure which presses the fluid 13 directly without providing the plunger 16 may be sufficient.
  • the flow meter 10 includes a gas unit 100 that communicates with the container 12 and sends a gas that presses the fluid 13 into the container 12.
  • the gas unit 100 includes a pipe (for example, a manifold) constituting the air flow path AD1, and is connected between the container 12 (measurement adapter 15) and the air supply source 20.
  • the gas unit 100 includes a flow meter 101 (for example, a mass flow meter, a volume flow meter, etc.), an electropneumatic regulator 21, a pressure gauge 23, and a regulator 102 with a filter provided in the middle of the air flow path AD1. And.
  • the flow meter 101 is used to measure the gas flow rate Q ′′ when it is pressed with air in order to discharge the fluid 13 from the measuring needle 11A. Further, the electropneumatic regulator 21 is supplied into the container 12. The pressure value P (gas pressure P) of air is adjusted, that is, the pressure value P that presses the fluid 13 is adjusted, and the pressure gauge 23 is provided downstream of the electropneumatic regulator 21, and the container 12. The pressure value P (gas pressure P) of the air supplied to the inside is measured, and the regulator with filter 102 is adjusted so as to remove foreign matters from the air supply source with a filter and supply stable air. Is.
  • the pressure gauge 23 can be omitted.
  • a pressure gauge 23 is provided downstream of the flow meter 101 and before the container 12 (measuring needle 11A).
  • the regulator 102 with a filter can be omitted when no foreign matter is mixed in the air supplied from the air supply source.
  • the flow meter 10 includes a temperature control unit 103 that controls the temperature of the fluid 13 accommodated in the container 12.
  • a temperature control unit 103 controls the temperature of the fluid 13 accommodated in the container 12.
  • the temperature control unit 103 can be omitted.
  • the viscometer 10 includes a computer unit 14 including a calculation function for calculating a viscosity characteristic of the fluid 13 from a gas pressure P and a gas flow rate Q ′′ when the fluid 13 is pressed.
  • the interface module 24 is connected to each of the electropneumatic regulator 21, the pressure gauge 23, the flow meter 101, and the temperature control unit 103 with signal lines (indicated by a one-dot chain line in FIG. 12). Therefore, for example, a control signal for adjusting the air supply amount or a control signal for adjusting the temperature of the temperature control unit 103 is sent from the computer unit 14 to the electropneumatic regulator 21.
  • data signals from the pressure gauge 23 and the flow meter 101 are sent to the computer unit 14. For this reason, Computer unit 14 (calculating function), when changing the gas pressure P by the electropneumatic regulator 21, it is possible to calculate the viscosity characteristics of the fluid 13 from the change in gas flow rate Q ".
  • the viscosity characteristic ( ⁇ w ⁇ w characteristic) of the fluid 13 to be measured is calculated by the computer unit 14 from the expressions (4) and (5). Then, the n value used in the equation (5) is determined from the slope of the straight line obtained by plotting the logarithmic graph with the gas pressure ⁇ P on the horizontal axis and the gas flow rate Q ′′ on the vertical axis. .
  • the present inventor has found that the n value obtained from the apparent flow rate Q ′ and the n value obtained from the gas flow rate Q ′′ are the same (or approximate).
  • the gas flow rate Q ′′ can be regarded as the flow rate Q of the fluid 13, and the viscosity characteristic of the fluid 13 can be measured. Since the flow rate Q of the fluid 13 is not directly measured, the viscometer 10 Can be configured simply.
  • FIG. 13 It is a figure for demonstrating the structure of the viscometer 10. In addition, only the structure of the gas unit 100 is different between FIG.
  • a gas unit 100 shown in FIG. 13 includes a mass flow controller 104 that adjusts a gas flow rate Q ′′ and a pressure gauge 23 that measures a gas pressure P.
  • the mass flow controller 104 and the computer unit 14 include a signal line. (Indicated by a one-dot chain line in FIG. 13.) Accordingly, a control signal for adjusting the gas flow rate Q ′′ is sent from the computer unit 14 to the mass flow controller 104. Therefore, the computer unit 14 (calculation function) can calculate the viscosity characteristic of the fluid 13 from the change in the gas pressure P when the gas flow rate Q ′′ is changed by the mass flow controller 104.
  • the viscometer 10 in this embodiment measures the viscosity characteristics of the fluid 13 from the gas pressure P and the gas flow rate Q ′′ when pressing the fluid 13.
  • the viscometer 10 shown in FIG. The electropneumatic regulator 21 is controlled by a command from the computer unit 14.
  • the flow rate Q of the fluid 13 is determined by measuring the flow rate Q ′′ of air (pressure air) supplied to the measurement container 12. I consider it.
  • the viscometer 10 shown in FIG. 13 supplies air having a constant flow rate Q ′′ to the container 12 according to a command from the computer unit 14 by the mass flow controller 104, and the pressure P (gas pressure P applied to the container 12 at that time).
  • the mass flow controller 104 feeds in an amount of air whose accuracy can be guaranteed, and the pressure P applied to the container 12 at that time is measured by the pressure gauge 23.
  • FIG. In the viscometer 10 shown, since the mass flow controller 104 is expensive, a combination method of the electropneumatic regulator 21 and the flow meter 101 is adopted with a focus on price.
  • the time T during which the apparent flow rate Q ′′ of the fluid 13 discharged from the measuring needle 11A passes between the two photoelectric sensors 25 and 26 arranged at a predetermined interval is used. Further, the viscometer 10 according to the first embodiment needs to remove the fluid 13 remaining at the tip of the measuring needle 11A when continuously measuring, and the blower 31, It is necessary to provide a removal mechanism with 32 or a mechanical cutting mechanism.
  • the viscometer 10 in the present embodiment has the following characteristics. First, since the flow rate of the dispersion fluid 13 discharged from the measuring needle 11A is not directly measured, there is no need to provide a photoelectric sensor, a mechanical cutting mechanism, etc. on the front surface of the viscometer 10, and the measurer can be aware of anything. Absent. Moreover, it is excellent in operability and maintenance. In particular, since there is no mechanical cutting mechanism, it is easy to handle and difficult to break. In addition, since it is not necessary to cut the dispersion fluid 13 at the tip of the measurement needle 11A, the measurement speed can be increased.
  • the measurement accuracy depends on the detection accuracy of the photoelectric sensors 25 and 26, and the measurement accuracy can only be obtained experimentally and is difficult to determine logically.
  • the measurement accuracy can be logically determined from the accuracy of the flow meter 101, the electropneumatic regulator 21, and the mass flow controller 104. Therefore, the calibration of the apparatus becomes easy.
  • the viscometer 10 in the present embodiment can also be used in the second to fourth embodiments.
  • a pressure measurement curve is analyzed, it is possible to analyze physical quantities such as the adhesive force between the dispersion fluid 13 and the needle wall surface and the yield stress that starts to flow.
  • cream solder is a measurement target
  • a pigment or the like can also be a measurement target.
  • Newtonian fluid for example, water etc.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Coating Apparatus (AREA)
  • Measuring Arrangements Characterized By The Use Of Fluids (AREA)
  • Electric Connection Of Electric Components To Printed Circuits (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

La présente invention concerne un viscosimètre permettant de mesurer, au moyen d'une conception simple, les caractéristiques de viscosité d'un fluide. Le viscosimètre (10) comporte un contenant (12) destiné à contenir un fluide (13) ; une unité de gaz (100), qui alimente le contenant (12) en gaz (par exemple, de l'air), ledit gaz exerçant une pression sur le fluide (13) en communiquant avec le contenant (12) ; une aiguille de mesure (11A), qui forme un jet de fluide (13) en communiquant avec le contenant (12), ledit fluide ayant été soumis à la pression exercée par le gaz ; et une partie ordinateur (14), qui comprend une fonction de calcul pour calculer les caractéristiques de viscosité du fluide (13) sur la base de la pression gazeuse et du volume d'écoulement gazeux au moment où la pression est exercée sur le fluide (13). L'unité de gaz (100) est pourvue d'un régulateur électropneumatique (21), qui règle la pression gazeuse, et d'un débitmètre (101) qui mesure le volume de l'écoulement gazeux. La fonction de calcul de la partie ordinateur (14) calcule les caractéristiques de viscosité du fluide (13) sur la base d'un changement de volume de l'écoulement gazeux obtenu lorsque la pression gazeuse est modifiée par le régulateur (21).
PCT/JP2013/065109 2012-05-31 2013-05-30 Viscosimètre WO2013180245A1 (fr)

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Cited By (2)

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JP6194462B1 (ja) * 2017-02-06 2017-09-13 株式会社プロセス・ラボ・ミクロン メタルマスクとはんだペーストの適合性診断システム及び適合性診断方法
WO2022065369A1 (fr) * 2020-09-28 2022-03-31 株式会社村田製作所 Capteur de caractéristique de fluide

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CN113155673A (zh) * 2014-04-11 2021-07-23 电流感应器公司 粘度计和使用该粘度计的方法
JP6423564B1 (ja) * 2018-05-24 2018-11-14 天竜精機株式会社 はんだ印刷装置及びはんだ印刷方法
CN109297440A (zh) * 2018-11-04 2019-02-01 江苏兴达钢帘线股份有限公司 一种使用旋转粘度计测量圆柱物件表面相对粗糙度的方法

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JP2018126889A (ja) * 2017-02-06 2018-08-16 株式会社プロセス・ラボ・ミクロン メタルマスクとはんだペーストの適合性診断システム及び適合性診断方法
WO2022065369A1 (fr) * 2020-09-28 2022-03-31 株式会社村田製作所 Capteur de caractéristique de fluide
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JP7332055B2 (ja) 2020-09-28 2023-08-23 株式会社村田製作所 流体特性センサ

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CN104272085B (zh) 2018-03-20

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