JPS6193917A - Measuring method of quantity of paint stuck on metal plate - Google Patents

Abstract

PURPOSE:To perform automatic measurement with excellent accuracy by calculating the supply quantity S(g/min) of paint in measuring time T(min) and the return quantity W(g) of the paint which is not painted on a metal plate and measuring the throughput L(m) of this metal plate passing during this measuring time T. CONSTITUTION:A fixed quantity of paint 12 is supplied to a coater pan 13 every hour by a fixed quantity pump 17. The rest of quantity of the paints 12 which are painted on the metal plate 8 return to a return tank 16. A pump 21 is stopped during measuring time and the return quantity of the paints 12 is measured by a load cell 20 by stopping an outflow from the return tank 16 to a storage tank 18. Then, the quantity H1(g/m<2>) of the paint stuck on the metal plate 8 is calculated on a basis of a formula by an arithmetic unit 23. Hereby, the automatic measurement is performed with excellent accuracy.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention applies paint to a metal plate. Gold J
This invention relates to a method for measuring the amount of paint applied on a board.

[Conventional technology]

Conventionally, the method for measuring the amount of paint deposited on a metal plate was disclosed in, for example, Japanese Patent Application Laid-open No. 5
There was a method (1) proposed in No. 6-157807 using the apparatus shown in FIG.

In this method, a metal plate 8 is irradiated with X-rays 2 emitted from a radiation source 1, and the associated X-rays 3 from a substance in a film thickness 7 are transmitted to an X-ray detector 4, a counter 5, and a film thickness detector. The film thickness 7 was measured by detecting 6 and 6.

Another conventional method (2) is to form grooves of different depths on a roll, apply paint to the grooves, and read the results with a gauge, which is simple and often used.

[Problem that the invention seeks to solve]

However, in the above-mentioned conventional method (1), it is necessary to uniformly disperse a substance (for example, TiO2) in the paint that does not have a serious adverse effect on the color tone, and it is necessary to carry out calibration in advance to determine the film thickness. The problem was that the line had to be determined in advance, and the accuracy was poor.

In addition, the conventional method (2) has a four-material pile amplifier, serves only as a guide, and is inaccurate.

Furthermore, since the measurement was performed manually, there was a problem in that roll marks remained.

The present invention has been proposed in order to solve the above-mentioned problems, and is capable of automatically determining the adhesion of paint on a metal plate with high precision and without manual intervention. One objective is to provide a constant force method for the quantity Δ11.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments with reference to the drawings.

First, an embodiment of the first invention will be described.

FIG. 1 shows a coating apparatus used in a method according to an embodiment of the present invention, and first, the flow of paint will be explained.

The paint 12 in the storage tank 18 is supplied to the coater pan 1 via a supply pipe 14 by a metering pump 17 which is a paint supply device.
3 is supplied in a fixed amount every hour.

Further, the paint 12 is applied to the metal plate 8 via a big roller, a blow roll 11, and an applicator roll 10.
7 On the other hand, the coating material 12 in an amount greater than that applied to the metal plate 8 is supplied to the coater pan 13 by the metering pump 17, and is returned to the coater pan 13 by the overflow piping 15! link 16. Therefore, the amount of paint 12 in the coater pan 13 is constant.

Further, the paint 112 in the return tank 16 is returned to the storage tank 18 via a return pipe 22 by a pump 21 which is a fuel I return device.

Next, the method of this embodiment will be explained.

The paint 12 is supplied to the coater pan 13 in a fixed amount every hour by a metering pump 17 which is a paint 1 supply device. The paint 12 is returned to the return tank 16 except for the part where the metal plate 8 is coated. At the measurement time, the pump 21 is stopped and the flow from the return tank 16 to the storage tank 18 is stopped, so that the return amount of 131i$412 is measured by the load cell 20.

Further, the amount of passage of the metal plate 8 during the measurement is measured by a length measuring device 19.

The amount H1 of paint adhered to the metal plate 8 is determined by the calculation device 23 using the following equation.

At a glance, Hl: Paint 1 is attached! i) (g/m″) S: Amount of paint supplied to the coater pan 13 by the seven-day pump 17, which is a paint supply device (g/m1n) T: Measurement time (min) W: No coating during measurement time T Return tank 1 which is the amount of paint
Paint return device in 6 (g) L: Measurement time T
The amount of passage of the metal plate 8 in (m) B: Width of the metal plate 8 (m).

In the above method, as in the present invention, the paint supply amount S and the feedback MW are
The amount H1 of paint deposited per unit amount of the metal plate 8 is determined from the difference between the two and the weight of the metal plate 8 passed during this measurement time T.

Next, a method according to an embodiment of the second invention will be described.

FIG. 2 shows a coating apparatus used in the method of this embodiment.

The paint 12 is supplied to the coater pan 13 by the paint supply device 111-pop 17 at a constant rate of 4f1! 11 supply.

The paint 12 is returned to the tank 1 except for the amount applied to the metal plate 8.
Return to 6.

The return tank 16 is controlled so that the amount of paint 12 remains constant. That is, the paint level is detected by the level meter 24, and the rotation speed of the metering pump 25, which is a paint return device, is controlled according to level fluctuations so that the level remains constant, and the paint 12 is returned to the storage tank 18. The passing speed of the metal plate 8 at this time is measured by a length measuring device 19.

Hl for paint adhesion to the metal plate 8 is determined by the calculation device 23 using the following equation.

here.

Hl: Paint adhesion amount (g/m'') Sl:
Coating amount (g/m1n) of metering pump 17, which is the coating 1 supply device S2. The unpainted paint 1 is returned by the metering pump 25, which is a paint returning device! Ii: (g/m1n) Sentence: Passing speed of metal plate 8 (m/m1n) B・Width of metal plate 8
(m).

As described above, the amount H2 of the paint 12 adhering to the metal plate 8 is detected from the relationship between the supply amount S1 and the return amount S2 of the paint 12 and the passing speed of the metal plate 8.

Next, a method according to an embodiment of the present invention using :iS3 will be explained.

In the first and second methods of the present invention described above, only the average amount of coating Nl 2 on 8 metal plates can be detected.

Furthermore, a film thickness meter that uses optical X-rays or the like cannot detect the absolute value of film thickness unless it is calibrated.

Therefore, as shown in FIG. 3, a film thickness gauge 6 using fluorescent X-rays or the like is moved in the board width direction by a screw 26 and a motor 27 to measure adhesion changes in the board width direction.

At this time, the width in the sheet width direction is adjusted by adjusting the roll pressing force, etc.
Try to equalize the amount. By the performer 28, this attachment 1f
By setting the average value of fl to the same unit as the adhesion amount H1 or H2 determined by the first or second method of the present invention, the film thickness can be uniform in the board width direction without having to calibrate the film thickness meter 6 using a standard board, etc. Also, the absolute value H3 (g/m'') of the amount of paint adhered is detected.

An embodiment of the arithmetic unit 28 is shown in FIG.

a! is a signal representing the paint adhesion amount HI or H2 (g/m') according to the first and second embodiment methods of the present invention.

a2 is the film thickness (adhesion amount) of film thickness meter 6 using fluorescent X-rays, etc.
(tile m).The integrator 29 calculates the integrated value of the H-thickness, and the divider 30 divides by the moving distance to calculate the average value a2 (door m) of the film thickness signal. Here, the moving distance means the width B of the metal plate 8, and a2 is the average film thickness (μm) in the plate width direction.

Here, since the film thickness gauge 6 moves at a constant speed, the moving distance is determined in terms of time, and the divider 2
It is built into 8. Furthermore, by calculating a+/&2 with the divider 31, the ratio (a+/a2) between the film thickness a2 obtained with the film thickness meter 6 and the adhesion amount is obtained. By determining the product H3 = a2

The value indicating the change in thickness in the board width direction) is calculated as the output of the calculator 32, and the paint adhesion in the same unit as the paint material H1 or H2 (g/m') obtained by the first and second methods of the present invention is calculated. ;The absolute value H3 (g/m') of the stop is determined.

This value is the same as the absolute value of the average value, but in the product, the pressing force etc. are controlled to eliminate unevenness in the width direction of the film thickness meter 6 using fluorescent X-rays etc. In reality, the n2 thickness gauge 6 is measured using highly accurately calibrated optical X-rays or the like.

Next, a modification of the coating apparatus used in the first, second, and third embodiment methods of the present invention will be described.

Although the paint 12 in the return tank 16 is measured by the load cell 20 in FIG. 1, it may also be measured by level meters 33 and 34 as shown in FIG.

In other words, after the pump 21 stops, the measurement time T required for the paint to increase from level 1 to level 2 is determined, and the above formula (
The paint adhesion amount H1 may be determined by 1).

: In the diagram, a weighing device such as a load cell 20 is installed at the bottom of the return tank 16 to control the amount of paint 12 in the return tank 16 as shown in Figure 1.
The pump 25 may be controlled so that the weight measured by the weighing device is constant, and the paint adhesion amount H2 may be determined from the above equation (2).

Further, in FIG. 3, the film thickness gauge 6 is an I! film thickness gauge such as an infrared film thickness gauge. 1! Any continuous type film thickness meter is sufficient6 [Effects of the Invention] The present invention is as follows.
- Coating on the board' [By detecting the amount of coating and adjusting the pressing pressure per circumferential speed of each manufacturer's roll, it is possible to control the coating film thickness.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a coating device used in the method according to the first embodiment of the present invention, and FIG. 2 is an explanatory diagram of the coating device used in the method according to the second embodiment of the present invention. FIG. 3 is a diagram 91 showing a description of a coating device used in the method according to the third embodiment of the present invention, and FIG. 4 is an example of a computing unit constituting the coating device used in the method according to the third embodiment of the present invention. FIG. 5 is an explanatory diagram of a modification of the coating apparatus shown in FIG. 1, and FIG. 6 is an explanatory diagram of a measuring instrument using a conventional fluorescent X-ray method. 3...Fluorescent X-ray 4...X-ray detector 8...
Gold a plate 9...Back roll lO...Applicator roll 11...Pickup roll 12...Paint 13...Coater pan j
”6°゛°return y/y 17°
°°Quantification 1″18...Storage tank 19...Length measuring device 20...Load cell 21...Pump 23...
- Arithmetic device 24... Level meter 25... Pump 27... Motor 28... Arithmetic unit 2
9... Integrator 30. 31... Divider 32... Multiplication calculator 33. 34... Level meter

Claims (1)

[Claims] 1. Calculate the supplied amount S of paint at a measuring time T, which is supplied in a fixed amount every hour, and the returned amount W of the paint that was not coated on the metal plate, and calculate the amount of paint that passed during the measuring time T. Measure the passing amount L of the metal plate, and calculate the amount H_1 of paint deposited per unit amount of the metal plate using the following formula.
A method for measuring the amount of paint deposited on a metal plate, characterized by determining the amount of paint deposited on a metal plate. H_1=(ST-W)/(LB) Here, H_1: Amount of paint deposited (g/m^2) S: Amount of paint supplied by the paint supply device (g/min) T: Measurement time (min) W: The amount of unpainted paint returned during the measurement time T (g) L: The amount of the metal plate passing through the measurement time T (m) B: The width of the metal plate (m). 2. Calculate the supply amount S_1 of the paint that is supplied in a constant amount every hour at the measurement time T and the return amount S_2 of the paint that was not coated on the metal plate, and calculate the passing speed l of the metal plate that passed during the measurement time T. A method for measuring the amount of paint deposited on a metal plate, characterized in that the amount H_2 of the paint deposited per unit of the metal plate is determined by the following formula. H_2=(S_1-S_2)/(lB) Here, H_2: Amount of paint deposited (g/m^2) S_1: Amount of paint supplied by the paint supply device (g/min) S_2: Unpainted paint Amount of feedback by the feedback device (g/min) l: Passing speed of the metal plate (m/min) B: Width of the metal plate (m). 3 Measure the change in the paint film thickness in the width direction of the metal plate with a film thickness meter that moves in the width direction of the metal plate, determine the film thickness a_2 in the width direction of the plate, and the average film thickness ■, and use the following formula (1) or ( By determining the paint adhesion amount H_1 or H_2 obtained in step 2), the absolute value H_3 of the paint adhesion amount in the board width direction in the same unit as the paint adhesion amount H_1 or H_2 is determined by the following equation (3). A method for measuring the amount of paint deposited on a metal plate. H_1=(ST-W)/(LB)...(1) Here, H_1: Amount of paint deposited (g/m^2) S: Amount of paint supplied by the paint supply device (g/min) T: Measurement Time (min) W: Return amount of unpainted paint during measurement time T (g) L: Passage amount of metal plate during measurement time T (m) B: Width of metal plate (m). H_2=(S_1-S_2)/(lB)...(2) Here, H_2: Amount of paint deposited (g/m^2) S_1: Amount of paint supplied by the paint supply device (g/min) S_2: Painting Amount of paint returned by the paint return device (g/min) l: Passing speed of the metal plate (m/min) B: Width of the metal plate (m). H_3=a_2×(a_1/■)...(3) Here, H_3: Absolute value of paint adhesion amount (g/m^2) a_1(H
_1 or H_2): Paint adhesion amount (g/m^2) a_2: Film thickness (μm) ■: Average film thickness (μm).