KR20170053901A - Apparatus and method for measuring transfer efficiency of spray paint - Google Patents

Abstract

Quantitative evaluation of the arrival efficiency of coating materials by quantitatively evaluating the arrival efficiency of paints using a device capable of calculating the amount of coating material in terms of volume during spray coating experiment and a method of measuring film thickness is quantitatively analyzed Disclosed is an apparatus and method for evaluating the arrival efficiency of a spray coating capable of presenting spray painting conditions with optimal efficiency. The apparatus for evaluating the arrival efficiency of a spray coating includes a weight measuring sensor for measuring a weight change amount of a paint to be evaluated stored in a paint storage container; A spray module for applying the paint to be evaluated of the paint storage container to the specimen; An operation unit for calculating the volume of the coating material used for coating based on the density of the coating material to be evaluated and the weight change amount of the coating material sensed after coating; And a coating thickness gauge for measuring a thickness of the dried coating film applied to the specimen. The calculating unit calculates a total volume of the dried coating film based on the thickness and the area of the dried coating film measured by the coating film thickness gauge, The humidity film volume is inversely calculated before the paint is dried in consideration of the solid content of the paint, and the arrival efficiency of the paint is calculated based on the volume of the paint used in the application and the volume of the humidity film.

Description

[0001] APPARATUS AND METHOD FOR MEASURING TRANSFER EFFICIENCY OF SPRAY PAINT [0002]

The present invention relates to an apparatus and method for estimating the arrival efficiency of a spray coating, and more particularly, to an apparatus and method for evaluating the arrival efficiency of a spray coating, which can quantitatively analyze the arrival efficiency of a paint during a spray coating experiment, And an evaluation apparatus and method.

Generally, the ship is made of steel plate, and a spraying type painting work is performed to protect the steel plate surface of the ship from corrosion or external environment.

Korean Patent Laid-Open Publication No. 10-2009-0052541 (2009.06.01) filed in the name of Korean Patent Application No. 10-1454382 (Apr. 17, 2014) discloses an apparatus and method for measuring the state of spraying paint. Has been disclosed.

However, since the conventional paint evaluation device can not know the amount of the discharged material through the spray device accurately, the paint arrival efficiency is not quantitatively analyzed and only the relative comparison result between the spray painting conditions of interest is obtained.

Patent Document 1: Korean Published Patent Application No. 10-2009-0052541 (2009.06.01) Patent Document 2: Korean Patent Publication No. 10-1454382 (Oct. 17, 2014)

In order to solve such conventional problems, the present invention quantitatively evaluates the arrival efficiency of coating materials by using a device capable of calculating the amount of paint to be used in spray test and a method of measuring film thickness, Provided is an apparatus and method for estimating the arrival efficiency of a spray painting which can quantitatively analyze changes in arrival efficiency according to various coating conditions and present spray painting conditions with optimal efficiency.

The apparatus for evaluating the arrival efficiency of a spray coating according to the present invention comprises: a weight measuring sensor for measuring a weight change amount of a paint to be evaluated stored in a paint storage container; A spray module for applying the paint to be evaluated of the paint storage container to the specimen; An operation unit for calculating the volume of the coating material used for coating based on the density of the coating material to be evaluated and the weight change amount of the coating material sensed after coating; And a coating thickness gauge for measuring a thickness of the dried coating film applied to the specimen. The calculating unit calculates a total volume of the dried coating film based on the thickness and the area of the dried coating film measured by the coating film thickness gauge, The humidity film volume is inversely calculated before the paint is dried in consideration of the solid content of the paint, and the arrival efficiency of the paint is calculated based on the volume of the paint used in the application and the volume of the humidity film.

According to another aspect of the present invention, there is provided a method of evaluating an arrival efficiency of a spray coating, comprising the steps of: applying a paint to a specimen according to a spray coating condition of a paint to be evaluated; Measuring a weight change amount of the paint to be evaluated after spray application; Calculating the volume of the coating material based on the density and weight variation of the coating material; Drying the coated specimen; Measuring the thickness of the dried coating and the applied area to calculate the total volume of the dried coating; Inversely calculating the humidity film volume before drying the paint based on the volume of the dried film and the solid content of the paint; And calculating the arrival efficiency of the paint on the basis of the volume of the used paint and the humidity film volume.

The apparatus and method for estimating the arrival efficiency of a spray coating according to the present invention can evaluate the arrival efficiency through the volume ratio of the paint, thereby performing more accurate evaluation compared with other evaluation methods. Further, data can be utilized as an average value of the film thicknesses at a plurality of points, and further improved evaluation reliability can be obtained by considering the dry film volume, the humidity film volume, and the solid content ratio. In addition, it is possible to estimate the film thickness value to be formed under a specific condition and to provide a coating condition having an optimum efficiency by databaseing the arrival efficiency values for various spray painting conditions.

FIG. 1 schematically shows a configuration of a spray painting arrival efficiency evaluating apparatus according to an embodiment of the present invention,
FIG. 2 is a diagram for calculating a used paint volume according to an embodiment of the present invention,
FIG. 3 illustrates a method of measuring a dry film thickness according to an embodiment of the present invention,
4 is a total dry film volume calculation formula according to an embodiment of the present invention,
5 is a total volume calculation formula of a humidity film according to an embodiment of the present invention,
FIG. 6 is a calculation formula of an arrival efficiency according to an embodiment of the present invention,
7 is a flowchart illustrating a method for evaluating the arrival efficiency of a spray painting according to an embodiment of the present invention.

Hereinafter, the technical composition of the apparatus and method for estimating the arrival efficiency of spray painting will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic view of a configuration of an apparatus for evaluating the arrival efficiency of a spray coating according to an embodiment of the present invention. FIG. 2 is a diagram for calculating a used paint volume according to an embodiment of the present invention. FIG. 4 is a graph illustrating a method of calculating a dry film thickness according to an embodiment of the present invention. FIG. And FIG. 6 is a calculation formula of the arrival efficiency according to an embodiment of the present invention.

1 to 6, an apparatus for evaluating the arrival efficiency of a spray coating according to an embodiment of the present invention includes a paint storage container 6, a paint suction hose 7, a spray pump 8, A paint film hose 10, a spray module, an input unit 1, a weight measuring sensor 2, a calculating unit 3, a film thickness measuring instrument and a cable 4.

The paint storage container (6) has an accommodation space inside to store the evaluation target paint (5). The paint suction hose 7 is a passage for sucking the paint 5 inside the paint storage container 6 by connecting the inside of the paint storage container 6 with a spray pump 8 to be described later.

The spray pump 8 can be implemented as a hydraulic or pneumatic type and sucks the paint 5 inside the paint storage container 6. [ The pressure regulating gauge (9) regulates the operating pressure of the spray pump (8).

The paint hose 10 connects the spray pump 8 and the spray gun 11 to be described later and is a path for transferring the paint sucked through the spray pump 8 to the spray gun 11 side. The paint hose 10 may be made of a flexible material.

The spray module is composed of a spray gun 11 and a spray tip 12 for applying a paint to be evaluated in a paint storage container 6 to a specimen. The spray gun 11 controls the spraying of the paint transferred through the paint hose 10 on and off. The spray tip (12) is connected to the end of the spray gun (11) to atomize and discharge the sprayed paint. The paint sprayed through the spray tip (12) is sprayed onto the top surface of the specimen (14) in the form of an atomizing paint (13).

The input unit 1 inputs and stores the density of the paint to be evaluated. In this case, the density of the paint to be evaluated can be realized by a method in which the operator directly inputs the density and a method in which the density value preset in advance for each kind of paint is selected.

The weight measuring sensor (2) measures the weight change amount of the evaluation target paint stored in the paint storage container (6). The weight measurement sensor 2 is provided at the lower end of the paint storage container 6 to measure the weight change amount of the paint storage container 6. [ The paint in the paint storage container 6 is sucked through the spray pump 8 and transferred to the side of the spray gun 11 so that the total weight of the paint storage container 6 is reduced. The weight measuring sensor 2 senses the amount of decrease in the weight of the paint storage container and transmits the sensed information to the calculating section 3 to be described later.

Operation unit 3 is based on the density change in weight (Δw) of the coating material after detection (ρ _paint) and the application of the coating evaluated, and calculates the volume (V _spray) of the coating material used for coating. That is, the volume (V _spray ) of the used _paint can be obtained by dividing the weight change amount? W of the paint by the density (? Paint) of the _{paint as} shown in FIG.

The film thickness gauge measures the thickness of the dried film applied to the specimen. Referring to Figs. 3 and 4, the film thickness gauge measures a thickness value (T _mn ) of a plurality of points (m, n) arranged in the transverse direction and the longitudinal direction of the coating film. The average thickness value is the sum of the thicknesses of the respective points, i.e., the sum of the values of T ₁₁ , T ₁₂ , ... T _1n , T ₂₁ , ... T _m1 , ... T _mn , m x n).

The cable 4 electrically connects the weight measuring sensor 2 and the calculating unit 3 so that data can be transmitted. On the other hand, the calculation unit 3 can be configured to calculate the used paint volume and then display the value externally.

The calculation unit 3 calculates the total volume (V _dry ) of the dried coating film based on the thickness (average thickness) and the area of the dried coating film measured by the coating film thickness meter _film . That is, the total volume of the dried coating film (V _{dry film} can be obtained by multiplying the average thickness value of the coating film by the transverse length and the longitudinal length for the transverse length L and the longitudinal length H as shown in Fig.

Further, the calculating unit 3 calculates the _wet film volume (V _wet) before the paint is dried in consideration of the solid fraction of the paint _film . Referring to Figure 5, the humidity film volume V _{wet film} has a dry film volume V _{dry film} is divided by the volume solid ratio.

In addition, the calculation unit 3 calculates the transfer efficiency (%) of the paint based on the volume (V _spray ) of the paint used in coating and the volume of the _{wet film} (V _{wet film} ). Referring to FIG. 6, the transfer efficiency (%) of the paint is calculated by _dividing the humidity film volume (V _wet ) by the volume of the used paint (V _spray ) _film ) as a percentage.

7 is a flowchart illustrating a method for evaluating the arrival efficiency of a spray painting according to an embodiment of the present invention.

Referring to FIG. 7, the method for estimating the arrival efficiency of a spray coating according to an embodiment of the present invention includes the steps of: (S10) inputting a density of a coating material to an input unit; A step (S30) of measuring a weight change amount of the paint to be evaluated after applying the spray, a step (40) of calculating a volume of the paint used based on the density of the paint and the weight change amount, A step S60 of drying the coated specimen, a step S60 of calculating the total volume of the dried coating film by measuring the thickness and the coated area of the dried coating film, the step S60 of calculating the total volume of the dried coating film, (S70) of inversely calculating the volume of the humidity film before the paint is dried, and calculating the arrival efficiency of the paint based on the volume of the used paint and the volume of the humidity film (S80).

(S10), the density of the paint is input to the input unit. The density value of the inputted paint is transmitted to the calculation section 3 and used as calculation data.

(S20), the paint is applied to the specimen 14 having a predetermined size according to the spray coating conditions of the paint to be evaluated. When the spray pump 8 is driven, the paint stored in the paint storage container 6 is conveyed along the paint suction hose 7 to the spray gun 11 side and is sprayed through the spray tip 12 in the form of atomized paint 13 (14).

(S30), the weight measuring sensor 2 measures the weight change amount (decrease amount) after applying the spray. In (S40) step, the operation unit 3 is based on the density of the weight change (Δw) of the coating material after detection (ρ _paint) and the application of the evaluation target coating, and calculating the volume (V _spray) of the coating material used for coating .

(S50), the painted specimen 14 is thoroughly dried under constant temperature and humidity conditions for three days or more.

In step S60, the film thickness is measured using a film thickness meter. In this case, the film thickness measuring device measures the thickness value (T _mn ) of a plurality of points (m, n) arranged in the transverse direction and the longitudinal direction of the coating film. The average thickness value is the sum of the thicknesses of the respective points, i.e., the sum of the values of T ₁₁ , T ₁₂ , ... T _1n , T ₂₁ , ... T _m1 , ... T _mn , m x n).

In step S60, the coating area of the coating film (H x L) is determined in addition to the thickness measurement of the coating film, and the calculation unit 3 calculates the total volume of the dry film. The total volume of _dry film (V _{dry film} can be obtained by multiplying the average value of the thickness of the coating film by the area of the coating film.

(S70), the volume of the humidity film before drying is inversely calculated in consideration of the solid fraction of the paint. Humidity film volume (V _{wet film} has a dry film volume V _{dry film} is divided by the volume solid ratio.

(S80), the calculating unit 3 calculates the volume (V _spray ) of the paint used in coating and the humidity film volume (V _{wet the} transfer efficiency (%) of the paint is calculated based on the _film .

The spray coating conditions can consist of at least one of the paint viscosity, the sprayer pressure, the length of the paint hose, the feed rate of the spray tip and the spray gun, the spacing distance between the spray tip and the spray gun and the specimen, And calculates the arrival efficiency of the paint while changing spray painting conditions. As a result, it is possible to obtain a quantitative arrival efficiency value by using the spray painting condition as a variable.

The apparatus and method for estimating the arrival efficiency of a spray coating according to an embodiment of the present invention can evaluate the arrival efficiency through the volume ratio of the paint and perform a more accurate evaluation compared with other evaluation methods. For reference, the method of inspecting the arrival efficiency of the paint using the mass ratio of the paint is often inaccurate because the mass of the solvent is evaporated at a high rate, and the present invention provides a more accurate calculation method.

Further, data can be utilized as an average value of the film thicknesses at a plurality of points, and further improved evaluation reliability can be obtained by considering the dry film volume, the humidity film volume, and the solid content ratio. In addition, it is possible to estimate the film thickness value to be formed under a specific condition and to provide a coating condition having an optimum efficiency by databaseing the arrival efficiency values for various spray painting conditions.

Although the apparatus and method for evaluating the arrival efficiency of spray painting according to the present invention have been described with reference to the embodiments shown in the drawings, it is to be understood that various changes and equivalent embodiments are possible without departing from the scope of the present invention. I will understand the point. Accordingly, the scope of the true technical protection should be determined by the technical idea of the appended claims.

1: Input 2: Weighing sensor
3: operation unit 4: cable
5: Paint 6: Paint storage container
7: paint suction hose 8: spray pump
9: Pressure gauge 10: Paint hose
11: Spray gun 12: Spray tip
13: atomized paint 14: specimen

Claims (8)

A weight measuring sensor (2) for measuring a weight change amount of a paint to be evaluated stored in a paint storage container (6);
A spray module for applying the paint to be evaluated of the paint storage container (6) to the specimen;
A calculation unit 3 for calculating the volume V _spray of the paint used in coating based on the density (ρ _paint ) of the _{paint to be} evaluated and the weight change amount (? W) of the paint sensed after coating; And
And a film thickness gauge for measuring a thickness of the dried coating film applied to the specimen,
The calculating unit 3 calculates the total volume V _dry of the dried coating film based on the thickness and the area of the dried coating film measured by the film thickness measuring machine _film and calculates the humidity film volume (V _wet) before drying of the paint in consideration of the solid content of the paint _film , and the volume (V _spray ) of the paint used in the application and the humidity film volume (V _{wet film} on the basis of the arrival efficiency of the paint. The method according to claim 1,
And an input unit (1) for inputting and storing the density (? Paint) of the _paint to be evaluated. The method according to claim 1,
The film thickness measuring devices are arranged in the transverse and longitudinal direction of the film multiple points (m, n) value of thickness (T _mn) the measurement, the total volume of the dry film _(dry V of _film has a transverse length L and a longitudinal length H,

Wherein the equation (3) is satisfied. The method according to claim 1,
Transfer efficiency (%) of coating material calculated in the calculating section 3 is wet film volume to volume (V _spray) of the coating material used (V _{wet film} is a value calculated as a percentage. Applying a paint to the specimen in accordance with a spray coating condition of the paint to be evaluated;
Measuring a weight change amount of the paint to be evaluated after spray application;
Calculating the volume of the coating material based on the density and weight variation of the coating material;
Drying the coated specimen;
Measuring the thickness of the dried coating and the applied area to calculate the total volume of the dried coating;
Inversely calculating the humidity film volume before drying the paint based on the volume of the dried film and the solid content of the paint; And
And calculating the arrival efficiency of the paint on the basis of the volume of the used paint and the humidity film volume. 6. The method of claim 5,
Calculating the total volume of the dried coating film is arranged in a transverse and longitudinal direction of the film multiple points (m, n) thickness value (T _mn) the measurement, the total volume of the dry film (V _dry in _film has a transverse length L and a longitudinal length H,

Wherein the equation is satisfied. 6. The method of claim 5,
Wherein in the step of calculating the humidity film volume, the humidity film volume is a value obtained by dividing the dry film volume by the solid fraction of the paint. 6. The method of claim 5,
The spray coating conditions include at least one of a coating viscosity, a sprayer pressure, a length of the coating hose, a conveying speed of the spray tip and the spray gun, a spacing distance between the spray tip and the spray gun and the specimen, And calculating an arrival efficiency of the paint while changing the arrival efficiency of the paint.

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