JP2002214117A - Simplified permeability testing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a testing device capable of executing, simply and surely, a permeability test of a coating film applied onto the surface of armoring material such as ALC or the like in an extremely short time without using consumables such as liquid, sealing material. SOLUTION: This simplified permeability testing device has a constitution wherein a vacuum pump 3 is continuously provided through a pipe 4 on the upper end of a cylindrical chamber 1 having an elastic pat 2 installed on the lower edge thereof, and a valve 5 is installed in the middle of the pipe 4, to thereby block the connection between the chamber 1 and the vacuum pump 3, and an internal pressure measuring device 6 capable of measuring the internal pressure of the chamber 1 is installed on the chamber 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-permeability test for an exterior material (hereinafter simply referred to as ALC) such as a porous plate having a surface coated with a waterproof coating, for example, a lightweight cellular concrete plate (ALC plate). A simple water permeability tester that can easily perform the test, especially without using consumables or adding water as in the past, and simply reducing the pressure in close contact with the coating film on the surface of the ALC. The present invention relates to a simple water permeability test apparatus capable of accurately measuring the quality of a waterproof coating film in an extremely short time.

[0002]

2. Description of the Related Art A conventional method for measuring and managing the waterproof performance of a coating film of ALC has been carried out according to "JIS K5400 Test Method for Water Permeability".

For example, as shown in FIGS. 5 and 6, a funnel 53 is erected on the surface of an ALC 52 having a surface coated with a waterproof coating 51 as shown in FIG. The liquid 54 composed of a solution is, for example, 250 mm
The height of the liquid 54 in the funnel 53 is measured by taking the weight of the liquid 54 in the funnel 53 to determine whether or not the liquid 54 passes through the coating film 51 over 3 days. It was measured whether there was a defect. In the figure, reference numeral 55 denotes a sealing material for preventing liquid leakage.

Further, as disclosed in Japanese Patent Application Laid-Open No. 9-49835, ALC is placed in a closed container containing water or an acid solution.
Immersed in a building material sample, etc., taken an image of bubbles generated from this building material sample with a camera, and obtained the image where the bubbles were generated for a certain area of the image polarized by the image processing device. There is also known a test apparatus that quantitatively measures through pinholes provided in a coating film by obtaining an area ratio that is not so using an image processing apparatus.

[0005]

However, when the test apparatus shown in FIGS. 5 and 6 is used, it takes three days or more for a test result to be obtained. There was a problem that at least one day was required. In addition, when operating this test device, it is necessary to add water.
There was also a problem that it was impossible to measure without changing the quality of the test material.

When the test apparatus shown in FIGS. 5 and 6 is used, a consumable material such as a sealing material 55 for sealing around the funnel 53 placed on the coating film 51 is required. Also, there was a problem that the cost was high. Also, as shown in FIG. 6, the surface is designed and processed with a deep groove joint 56 or the like.
In C52, even if an attempt is made to install a test apparatus in this part, there is a problem that it is difficult to perform a complete sealing operation with the sealing material 55, and it is troublesome to carry out.

Further, the technique disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 9-49835 has a problem that a part of a product such as ALC must be cut out as a test piece and tested, and the operation is complicated. In addition, this inspection apparatus requires a special camera and an image processing apparatus, so that there is a problem that the cost is extremely high. This inspection method also has problems that it requires water or an acid solution and that it takes a long time to complete the inspection.

[0008] The simple permeability test apparatus according to the present invention is a completely new technique developed in view of the above-mentioned many problems of the conventional apparatus, and particularly, a chamber capable of reducing pressure is brought into close contact with the surface of ALC, This chamber is depressurized through a decompression device, and it is measured in a short time whether or not air flows into the chamber through a pinhole provided in the ALC coating film. It is intended to provide a completely new test apparatus technology capable of easily performing a film test.

[0009]

SUMMARY OF THE INVENTION A simple water permeability test apparatus according to the present invention is an invention which has fundamentally improved many of the above-mentioned conventional problems. In a test device that can easily carry out a water permeability test of an exterior material such as a porous plate to which a coating film is applied, for example, a lightweight cellular concrete plate, etc. A pressure reducing device that can reduce the pressure inside the chamber is connected to the chamber that can be in close contact,
A simple water permeability test device comprising a closing device provided between the pressure reducing device and the chamber, and an internal pressure measuring device capable of measuring the internal pressure of the chamber connected to the chamber.

In the above-described apparatus of the present invention, a chamber which can be in close contact with the coating film provided on the surface of the exterior material such as ALC is used, and is installed at a desired arbitrary position on the exterior material. Thereby, the lower end edge of the chamber is brought into close contact with the coating film, and the inside of the chamber can be kept airtight. In particular, the airtightness of the chamber can be maintained by closely adhering to the surface of the ALC whose surface has been subjected to design processing such as joints of deep grooves.

In the apparatus of the present invention, a decompression device capable of decompressing the inside of the chamber is provided so as to be connected to the chamber. Pressure. Further, since a closing device is provided between the pressure reducing device and the chamber, the internal pressure of the chamber can be made independent of the outside air via the closing device.

Since the internal pressure measuring device capable of measuring the internal pressure in the chamber is connected to the chamber, the pinhole of the coating film applied to the surface of the ALC is placed in the chamber reduced to a predetermined pressure as described above. The internal pressure measuring device can determine whether or not the outside air flows through the internal pressure measuring device in a very short time, so that the performance of the coating film can be easily tested.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the simple water permeability test apparatus according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a simplified explanatory view of the water permeability test apparatus according to the present invention, and FIG. FIG. 3 is a perspective view of the bottom of the test apparatus, and FIG. 3 is an explanatory view of use of the water permeability test apparatus of FIG.

In FIGS. 1 and 2, reference numeral 1 denotes a decompression chamber, which is formed by a cylinder whose lower part is open. An elastic pad 2 made of a rubber-based foamed elastic body or the like is attached to the lower edge of the chamber 1, and the elastic pad 2 can completely adhere to an uneven surface such as a deep groove to maintain airtightness. It is configured to be able to.

Reference numeral 3 denotes a vacuum pump. The upper end of the chamber 1 and the vacuum pump 3 are connected to each other by a pipe 4, and the inside of the chamber 1 is depressurized by operating the vacuum pump 3. It is configured to be able to A valve 5 is attached to a predetermined position of the pipe 4, and the connection between the chamber 1 and the vacuum pump 3 can be cut off by rotating the valve 5.

Reference numeral 6 denotes an internal pressure measuring device which is configured to measure the internal pressure of the chamber 1. The tip of the internal pressure measuring device 6 is inserted into the chamber 1, and the measurement display unit is mounted so as to be exposed outside the chamber 1.

In the figure, reference numeral 7 denotes an ALC measured by the apparatus according to the present invention.
Is painted. If a pinhole such as 9 occurs in the coating film 8, there is a problem that the waterproof performance of the coating film is reduced. The present invention is to predict the amount of water permeation by measuring the presence and amount of the pinhole 9.

Next, a state in which the water permeability of the coating film 8 of the ALC 7 is measured using the apparatus according to the present invention will be described. That is, as shown in FIGS. 1 and 3, the chamber 1 of the apparatus is placed on the coating 8 applied to the surface of the ALC 7, and the elastic pad 2 provided on the lower edge thereof is placed on the coating 8. The chamber 1 is kept in close contact so that the chamber 1 can be kept airtight. Since the aforementioned elastic pad 2 has flexibility,
It is also inserted into the joint 10 of the ALC 7 so that it can be closely attached so that air does not pass therethrough.

In this state, the vacuum pump 3 is operated to gradually reduce the pressure in the chamber 1 through the pipe 4, for example, to about 1/20 of the atmospheric pressure. When the pressure of the chamber 1 reaches a predetermined pressure, the valve 5 attached to the pipe 4
To shut off the space between the chamber 1 and the vacuum pump 3. As described above, since the present invention does not require a complete vacuum, the vacuum pump does not need to have high performance.

Subsequently, by observing the scale of the internal pressure measuring device 6 attached to the chamber 1, it is observed whether or not the air pressure inside the chamber 1 changes within a certain time, for example, about 1 to 5 minutes. I do. This observation makes it possible to determine whether or not the pinhole 9 exists in the coating film 8 of the ALC 7.

In the above measurement, when the pinhole 9 does not exist in the coating 8 of the ALC 7 and the coating 8 has a predetermined waterproof property, the pressure in the chamber 1 is 1 to It hardly changes within about 5 minutes.

If the coating film 8 has a pinhole 9 or the like and does not have a predetermined waterproof property, air enters the chamber 1 from the ALC 7 through a defective portion of the pinhole 9 and the like, The pressure in 1 is rapidly increased in a short time. Therefore, by measuring this state with the internal pressure measuring device 6, it is possible to easily measure the quality of the performance of the coating film 8.

Since the relationship between the pressure fluctuation rate in the chamber 1 and the water permeability can be determined in advance by an experiment, by performing the above-described measurement, the water permeability of the ALC 7 to be measured can be determined. It can be easily calculated.

The graph shown in FIG. 4 shows an example in which a change in the internal pressure in the chamber 1 was measured using the test apparatus of the present invention. The vertical axis of the graph indicates the internal pressure (mbar) of the chamber 1, and the horizontal axis indicates the measurement time (minute).

In the measurement example, for example, the internal pressure of the chamber 1 rapidly rises from 50 to 500 or more within one minute after the start of the measurement, and the coating 8 applied to the surface of the ALC 7 Has a large number of pinholes 9 and therefore a large amount of water leakage per day (for example, 13.0).
0 cc), indicating that the performance of the coating film 8 was extremely poor.

Similarly, in the case of and
Within about 6 minutes from the start of the measurement, the internal pressure of the chamber 1 rises from 50 to 500 or more, and a relatively large or relatively large number of pinholes 9 exist in the coating 8 applied to the surface of the ALC 7. Therefore, the daily water leakage is 9.90 cc.
Or 7.00 cc, and it turned out that the performance of the coating film 8 was bad.

On the other hand, in the case of the above measurement, the internal pressure of the chamber 1 is within 150 even after about 6 minutes from the start of the measurement, and there is almost no change in the atmospheric pressure. 1.00 cc or less, and in these cases, the coating 8 applied to the surface of the ALC had almost no pinholes 9, so that it was found that the performance of the coating 8 was good.

[0028]

According to the above-described apparatus of the present invention, an internal pressure measuring device capable of measuring the internal pressure in the chamber is connected to the chamber. Whether or not outside air flows in through a pinhole or the like of the coating film applied to the surface of the ALC can be measured in a very short time by this internal pressure measuring device. It has a great effect such that the performance can be easily measured.

Further, the apparatus of the present invention does not require any liquid such as water or acid as in the above-mentioned conventional apparatus, and has an effect that it can be used in a dry manner. Further, consumables such as a sealing material are not required as in the related art, which has an effect that can be measured economically.

[Brief description of the drawings]

FIG. 1 is a simplified explanatory view of a water permeability test apparatus according to the present invention.

FIG. 2 is a perspective view of the bottom of the permeability test apparatus of FIG.

FIG. 3 is an explanatory view of use of the water permeability test device of FIG. 1;

FIG. 4 is a graph showing an example in which a change in the internal pressure in the chamber 1 is measured using the test apparatus of the present invention.

FIG. 5 is an explanatory front view of a conventional water permeability test apparatus.

6 is an explanatory perspective view showing a use state of the device of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Decompression chamber 2 ... Elastic pad 3 ... Vacuum pump 4 ... Pipe 5 ... Valve 6 ... Internal pressure measuring device 7 ... ALC 8 ... Coating 9 ... Pin hole 10 ... ALC7 joint 51 ... Coating 52 ... ALC 53 ... Funnel 54: Liquid composed of water or acid solution 55: Sealant 56: Deep groove joint

Claims (1)

[Claims] 1. A test apparatus capable of easily performing a water permeability test on an exterior material such as a porous plate having a surface coated with a coating film by waterproof coating. A pressure reducing device that can reduce the pressure inside the chamber is connected to a chamber that can be in close contact with the coating film, and a closing device is provided between the pressure reducing device and the chamber to measure the internal pressure of the chamber. A simple water permeability test device characterized in that the device is connected to a chamber.