JPH05312713A - Testing apparatus for resistance to weather and light - Google Patents

Abstract

PURPOSE:To test an object by irradiating it uniformly with intense energy rays. CONSTITUTION:The interior of a testing tank 1 is sectioned in the horizontal direction by a glass filter 2. The lower part is used as a sample chamber and the upper part as a lamp chamber 4. A sample stage 6 is arranged a predetermined distance from the glass filter 2 in the sample chamber 3, onto which a sample 19 is mounted. A lamp 8 which is curved like a mountain to apply the uniform irradiance to the whole upper surface of the sample stage 6 is set a predetermined distance from the glass filter 2 in the lamp chamber 4. Moreover, a blower 11 of a cooling wind to cool the interior of the lamp chamber 4 and the lamp 8 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tester for accelerating and evaluating weather resistance and photodegradation of paints and plastics, and more particularly to a device capable of uniformly irradiating the entire surface to be irradiated of a sample.

[0002]

2. Description of the Related Art As a conventional weather resistance tester, which is not shown in the drawings because of its widely known construction, Japanese Industrial Standard JIS
B 7754 "Xenon arc lamp type light resistance and weather resistance tester", etc., a light source for weather light test (for example, a straight tube-shaped xenon lamp) is vertically arranged in the center of a test tank, and a cylindrical shape is provided around the light source. Or, arrange a filter that transmits light of a specific wavelength or a specific wavelength range configured in a polygonal shape in close proximity,
Furthermore, a certain distance from the light source (for example, 480 from the center of the light source)
(mm) The sample is mounted vertically on a vertical cylindrical or annular sample frame that rotates around it and irradiates the irradiated surface of the sample with light of a specific wavelength or a specific wavelength range, and the temperature and humidity inside the test tank. There is a device that controls the spraying device for applying rainfall conditions to the sample and the spraying device for applying rain conditions to the sample, and performs a test corresponding to various climatic conditions.

Further, Japanese Patent Publication No. 55-13541 discloses that
A weather resistance tester as shown in FIG. 6 is disclosed. still,
FIG. 6 is a sectional view showing the gist of the configuration of this testing machine.

In the figure, a side wall 21 of the sample chamber 3 is a reflector having a parabolic cross section, and a straight tube-shaped xenon lamp 8 as a light source is horizontally arranged in its focus. It is placed on a sample table 6 which is horizontally arranged below. Further, a mirror 22 on a one-third cylinder curved in the sample direction from the xenon lamp 8 is arranged between the upper ends of the side walls 21, and an auxiliary mirror formed in a roof shape above the xenon lamp 8. 23 has the end of the mirror 22
It is arranged so as to be in contact with the end of the.

The point of the construction of this device is that the light from the light source is made into a parallel light beam, and uniform irradiation is carried out over the entire sample 19. Therefore, as described above, the side wall 21 has a parabolic cross section and its focal point. There is a light source in the room. Further, similarly to the main purpose of the device disclosed in Japanese Patent Publication No. 54-1199, the mirror 22 and the auxiliary mirror 23, which are optical filters in a broad sense, can selectively irradiate only the ultraviolet ray portion (UV portion). And the infrared part (IR
The part) is designed to reflect heat and release heat.

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the conventional weather resistance tester specified in IS B 7754, etc., the sample is mounted on a flat sample holder and the test is performed by directly facing the sample to the light source. Since the distance to the light source will be different,
The irradiance received by the entire irradiated surface of the sample was not uniform in the upper, middle, and lower parts, and the upper and lower parts were weak with respect to the central part.
Also, if the lamp capacity is increased to increase the lamp strength, the thermal energy will increase in proportion, and eliminating this without affecting the test piece would be structurally complicated, and of course the cost of the device would be high. It was also high and the economic efficiency of the test equipment was poor.

Therefore, as disclosed in, for example, Japanese Utility Model Publication No. 1-16034, the sample is received as a sample frame having a vertically cylindrical sample frame whose upper and lower portions are narrowed down toward a light source at a predetermined angle. An object to make the irradiance uniform, a sample holder having such a sample frame divided vertically (a sample holder having a U-shaped cross section), and a circle disclosed in Japanese Patent Publication No. 32-700. The sample is attached to an arc-shaped sample holder, and these sample holders are combined so as to have the same effect as that of the above-described sample frame so that the irradiance received by the sample surface is made uniform.

However, when the sample frame and the sample holder as described above are used, the size of the sample is limited during the test (generally, the maximum size of the sample is 15
0 mm, width 70 mm). For example, since a long sample cannot be tested as it is, it is necessary to divide it into short pieces, and even a wide sample needs to be bent according to the curvature of the sample frame. Therefore, samples that are not applicable to the sample frame and sample holder as described above must be divided into an appropriate size for testing, and it takes time and effort to prepare the sample, and samples that cannot be divided or bent cannot be separated. It was necessary to make samples for testing.

The Japanese Patent Publication No. 55-135 shown in FIG.
In the apparatus as disclosed in Japanese Patent No. 41, the side wall 21 of the sample chamber 3 is parabolic, the lamp 8 is arranged at the focal position thereof, and the irradiation light is made into parallel rays to uniformly irradiate the surface of the sample 19. Although it is an attempt to irradiate the same irradiation area with different irradiance, for example, to arrange a plurality of lamps 8 to obtain a stronger irradiance, the side wall 21 is made parabolic and the lamp 8 has its focus. This is impossible because it is a structure that is placed in a position. When the sample 19 is brought closer to the lamp 8 to obtain a stronger irradiance, such a structure naturally leads to a reduction in the irradiation area. Further, in order to remove the heat generated from the lamp 8, it is necessary to dispose the lamp 8 at the focal position of the parabola, so that the heat dissipation structure is also limited, and a large capacity lamp 8 is also used in this structure. Can not.

Therefore, with the device disclosed in Japanese Patent Publication No. 55-13541, it is not possible to easily increase the irradiance, so that it is impossible to obtain a high degree of acceleration, which is the purpose of the weather resistance test. Moreover, the irradiation area for irradiating the sample cannot be easily increased.

Further, as shown in FIG. 7, in an apparatus in which, for example, two straight tubular xenon lamps 8 are arranged in a mountain shape having a predetermined opening angle, the electrode portion 24 is located at the top. , Of course, because the electrode part 24 does not emit light,
As shown in FIG. 8, the light energy at the center of the irradiation surface was low, and it was impossible to make the entire sample surface have uniform irradiance.

Therefore, what kind of test condition is to solve the various problems of the conventional apparatus as described above, and to test the uniform irradiance over the entire irradiation surface of a large sample with strong irradiation energy. However, the challenge was to develop a device that can achieve good reproducibility.

[0013]

In order to solve the above-mentioned problems, the inside of the test tank is horizontally partitioned by a glass filter which transmits light energy of a specific wavelength or a specific wavelength range, and the lower part is divided into a sample chamber and the upper part. The sample chamber in the lower part has a glass filter in the lower part with a certain distance from the glass plate, and the upper part has a horizontal sample stand. In the upper part, one or more lamps with a mountain-shaped bend are arranged in parallel. A plurality of lamps are arranged with their tops facing upward at a predetermined distance from the glass filter, and the opening angle of the lamp is an angle that gives a uniform irradiance over the entire upper surface of the sample table. A weathering light tester constituted by connecting a device for introducing outside air or forced cooling air for cooling the interior of the lamp chamber and the lamp itself to the lamp chamber was used as the first means.

As a second means, a plurality of lamps each having the above-mentioned mountain-shaped bend are arranged such that the tops of the respective bends of the lamps are directed upward, and the tops of the lamps are centered with a space provided therebetween. Configured.

[0015]

The uniform irradiance can be obtained over the entire upper surface of the sample table by disposing the lamp bent in the shape of a mountain having an opening angle corresponding to the distance from the upper surface of the sample table. This uniformity does not change under any test conditions.
Further, since the lamp chamber is arranged independently, the inside of the lamp chamber and the lamp can be sufficiently cooled, the cooling efficiency of the glass filter for obtaining the light of the predetermined wavelength used as the partition between the lamp chamber and the sample chamber is increased, and Changes in transmittance are unlikely to occur.
Furthermore, by installing multiple lamps in parallel,
It is possible to obtain high-intensity irradiance and increase the sample area especially for long samples.

Further, by using a plurality of the above lamps and arranging them vertically and crossing each other, more uniform and high intensity irradiance can be obtained over the entire surface of the sample table.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the device of the present invention will be described below with reference to the drawings. 1 and 2 are configuration diagrams of a main part thereof, FIG. 1 is a sectional view taken along line AA of FIG. 2, and FIG. 2 is a sectional view taken along line BB of FIG.

In both figures, the test tank 1 has a rectangular parallelepiped shape.
The inside is horizontally partitioned by a flat glass filter 2 that transmits only light in the wavelength range of 300 to 700 nm, and the lower part is a sample chamber 3 and the upper part is a lamp chamber 4. The glass filter 2 is placed in close contact with a frame-shaped filter mounting frame 5 fixed on the same horizontal surface around the inner wall of the test tank 1.

A flat plate-shaped sample table 6 is horizontally fixed to the bottom of the sample chamber 3, and the distance between the upper surface of the sample table 6 and the lower surface of the glass filter 2 is about 30 cm. Further, in order to adjust the temperature and humidity inside the sample chamber 3, a temperature and humidity controller 7 is provided in contact with one side wall of the sample chamber 3. Although not shown in detail, the temperature adjusting / humidifying device 7 is a known device including a heater, a humidifying device, a blower, and the like. In addition, you may add a cooler etc. as needed.

At the center of the lamp chamber 4, a xenon lamp 8 (air cooling 1.
5 Kw) 1 piece, fixed with its top facing upward (described later)
I am doing it. Further, the lamp chamber 4 is provided with an outside air introduction port 9 and an exhaust port 10, and the outside air introduction port 9 is connected to a blower 11 for forcibly cooling the lamp 8 itself and the entire inside of the lamp chamber 4 with the outside air. There is. Note that this cooling may be performed by forced cooling air through a cooler or the like, if necessary.

FIG. 3 is a diagram for explaining the method of fixing the xenon lamp 8 used in this embodiment and the shape of the xenon lamp 8.

In the figure, the shape of the xenon lamp 8 is
Insulators 13 with lead wires 12 are attached to both ends thereof, the distance a between the tips of the insulators 13 is about 40 cm, the tube diameter (diameter) b of the discharge portion is about 20 mm, and the opening angle θ of the mountain shape is about 120. It is degree. The distance between the xenon lamp 8 and the glass filter 2 is defined by the distance c between the lower surface of the glass filter 2 and the horizontal line connecting the tips of the two insulators 13.
Is.

This xenon lamp 8 has an insulator mounting member 14
The fixtures 1 in which the insulators 13 at both ends of the lamp 8 are inserted into the through holes of the lamps and the fixtures are fixed to the filter attachment frame 5.
5 is fixed by bolts 16 or the like.
Further, the insulator mounting tool 14 and its fixing tool 15 are provided with elongated holes 17, respectively, so that the vertical direction, the horizontal direction and the mounting angle can be adjusted. The insulator mounting tool 14, the fixing tool 15 and the like are made of an insulating material. The fixing method of the xenon lamp 8 is not limited to the above method, and any method can be used as long as the vertical direction, the horizontal direction and the mounting angle can be easily adjusted and the lamp 8 can be firmly fixed.

Although not shown in detail in FIG. 2, the control panel 18 has a function of controlling lighting and extinguishing times of the lamp 8.
A function of communicating with a dry bulb and wet bulb thermometer (not shown) in the sample chamber 3 to set and control the temperature and humidity in the sample chamber 3,
There is a control device such as a microcomputer having a test time setting control function. Reference numeral 20 is a door for loading and unloading the sample 19.

Although not used in this embodiment, when it is desired to control the sample chamber 3 at a temperature at the same position as the sample 19 on the sample table 6, a thermometer (for example, weatherproof light) is directly mounted on the sample table 6. (Black panel thermometer generally used in testing machines)
And put it in contact with the temperature control function,
When continuously measuring the irradiance received by the surface of the sample 19, the light receiving part of the irradiance measuring device may be arranged in the same manner as the thermometer so that the measurement or recording can be performed on the control panel 18. This is easily possible with known technology. Similarly,
It is also possible to adjust the current voltage of the lamp 8 so that the irradiance received by the surface of the sample 19 is always maintained at a constant level.

Next, an experiment using the apparatus of this embodiment will be shown. Table 1 shows the ratio of irradiance at each position on the sample table 6 shown in FIG. The sample table 6 of this embodiment has an upper surface of 4
It is a 0 cm square.

FIG. 4 is a plan view of the sample table 6. When straight lines which are perpendicular to each other are drawn on the upper surface of the sample table 6, the intersections thereof are XY0, X1, X2, X3, X4, Y1, as shown in the drawing. Y2,
Y3, Y4, Y5, Y6, XY1, XY2, XY3, XY4, X
Y5, XY6, XY7 and XY8. At this time, XY0
The point coincides with the vertical line from the top of the xenon lamp 8, and XY
The straight line where 0, X1, X2, X3 and X4 are located is this lamp 8
The sample table 6 is arranged so as to coincide with the center line in the longitudinal direction of. Further, each value in Table 1 is a ratio when the irradiance is measured at each of the above points and the value at the XY0 point is set to 100.

[0028]

[Table 1]

As is clear from this table, XY1, XY
Area surrounded by 4 points of 2, XY3 and XY4 (40 cm x 30 c
In the m range), an irradiance of 92% or more is obtained with respect to the center XY0.

With the xenon lamp 8 turned on,
Place a black panel thermometer at each point in Table 1 above, center X
When the temperature of the sample chamber 3 is adjusted so that the same thermometer of Y0 maintains 63 ° C, the temperature at each point is the same as in JIS B 7
Like the test temperature specified in 754, it was within the range of 63 ± 3 ° C.

Next, as a second embodiment, although not shown, an apparatus having basically the same configuration as the apparatus of the first embodiment,
In order to make it possible to irradiate a large area with high energy, two lamps identical to the xenon lamp are fixed in parallel with the distance between the center lines in the lamp longitudinal direction being 20 cm, and fixed in the same manner as in the first embodiment. The case of arranging them will be described.

In this device, the lamp is X1, in FIG.
Center lines in the longitudinal direction were arranged vertically above parallel lines (parallel lines passing through Y2 and parallel lines passing through Y3) 10 cm apart from each other with a straight line connecting X4 as the center. In addition, the number and capacity of the blower for cooling the lamp itself and the lamp chamber and the temperature and humidity control device for controlling the temperature and humidity in the sample chamber are naturally increased. The distance between the lower surface of the glass filter, the upper surface of the sample table and the xenon lamp was the same as in the first embodiment.

At this time, the ratio of the irradiance on the sample table 6 in FIG. 4 is the same range as that in the first embodiment (XY1, XY2, XY3, X) when the irradiance at the XY0 point is 100.
9 in a 40 cm x 30 cm area surrounded by 4 points of Y4)
5% or more, similarly, the entire range (XY5,
40cm x 40cm surrounded by 4 points of XY6, XY7, XY8
In the range) was 90% or more. The radiant energy was about 1.8 times that of the device. The black panel temperature in this range is 6 as in the first embodiment.
It was within the range of 3 ± 3 ° C.

In the third embodiment of the present invention, as shown in FIG. 5, two xenon lamps 8 which are the same as those used in the first embodiment are provided, and the tops of both lamps are arranged on the same vertical line. The lamps are arranged so as to be positioned so as to be orthogonal to each other with the tops of the two lamps as the centers. For example, the longitudinal direction of the xenon lamp 8 is one of the xenon lamps in the X1 and X4 directions in FIG.
The other xenon lamp is arranged so as to be Y5 and Y6, and the vertical distance between the two is approximately 10 mm between the tops. The distance between the lower surface of the glass filter and the upper surface of the sample table and the xenon lamps arranged in the X1 and X4 directions was the same as that in the first embodiment.

Although not shown in FIG. 5, the fixing of each xenon lamp 8 is the same as the method of the first embodiment shown in FIG. 3, and the long hole 17 of the fixture 15 (see FIG. 3). ), One of the xenon lamps (the xenon lamps arranged in the Y5 and Y6 directions) is mounted about 10 mm above.

Although not shown in the figure, the blower 11 and the temperature / humidity adjusting device 7 in FIG. 1 are constructed by increasing the number and capacity thereof as in the second embodiment.

The values in Table 1 are the same as those in the first embodiment shown in FIG.
Is the ratio when the irradiance is measured at each point and the value at the XY0 point is 100.

[0038]

[Table 2]

As is clear from this table, XY5, XY
The irradiance ratio in the range of 40 cm × 40 cm surrounded by four points of 6, XY7 and XY8 was 90% or more with respect to the center XY0 in the second embodiment, but was 98% or more in this embodiment. I know there is. Further, the irradiance and the black panel temperature in this range were almost the same as those in the second embodiment, and were about 1.8 times and 63 ± 3 ° C., respectively.

Further, in order to obtain higher energy in the above three embodiments, a xenon lamp having a larger rating may be used, and the lamp is mounted in the vertical or horizontal direction as described above. Also, the mounting angle can be adjusted and the mounting method is easily possible.

[0041]

[Effect] According to the present invention, by disposing a lamp bent in a mountain shape having an opening angle according to the distance from the upper surface of the sample table, uniform irradiance can be obtained over the entire upper surface of the sample table. Out. Further, since the lamp chamber is arranged independently, the inside of the lamp chamber and the lamp can be sufficiently cooled, the cooling efficiency of the glass filter for obtaining the light of the predetermined wavelength used as the partition between the lamp chamber and the sample chamber is increased, and Changes in transmittance are unlikely to occur. Furthermore, it is possible to easily use a plurality of lamps without major modification of the device, to irradiate stronger light energy, and to increase a uniform irradiation area to easily cope with a large sample.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a main part of an apparatus according to a first embodiment, which is a cross-sectional view taken along the line AA of FIG.

FIG. 2 is a configuration diagram of a main part of the device according to the first embodiment, which is a cross-sectional view taken along line BB of FIG.

FIG. 3 is an explanatory diagram of a method for fixing the xenon lamp and a shape of the xenon lamp according to the first embodiment.

FIG. 4 is a plan view of the sample table of the first embodiment, showing a measurement point of irradiance.

FIG. 5 is a configuration diagram of a xenon lamp according to a third embodiment.

FIG. 6 is a configuration diagram of main parts of a conventional device.

FIG. 7 is a view showing a case where two straight tubular xenon lamps are arranged in a mountain shape.

FIG. 8 is a diagram showing a light distribution curve in FIG.

[Explanation of symbols]

 1 Test Tank 2 Glass Filter 3 Sample Chamber 4 Lamp Chamber 6 Sample Stage 7 Temperature / Humidity Controller 8 Xenon Lamp 11 Blower 14 Insulator Fixture 15 Fixture 17 Long Hole 18 Control Panel 19 Sample

Claims (2)

[Claims] 1. A weathering light tester comprising a light source for weathering resistance test arranged in an upper part of a test tank and a sample table arranged in a lower part of the test tank, and has a specific wavelength or a specific wavelength range in the test tank. It is partitioned horizontally by a glass filter that transmits the light energy of the sample chamber, the lower part is the sample chamber, the upper part is the lamp chamber, and the lower sample chamber is provided with a glass filter and a sample table with a horizontal upper surface. In the upper lamp chamber, one or a plurality of lamps each having a mountain-shaped bend are arranged in parallel, and the tops of the lamps are arranged at a predetermined distance from the glass filter. The opening angle of the lamp is The angle is set so as to provide uniform irradiance over the entire surface of the sample table, and the lamp chamber is connected to a device for feeding outside air or forced cooling air for cooling the lamp chamber and the lamp itself. , In normal weather resistance test A weathering light tester characterized in that, under temperature conditions, high-intensity light energy in a specific wavelength or in a specific wavelength range is uniformly irradiated on a sample mounted on a sample table surface. 2. A plurality of lamps each having a mountain-shaped bend are arranged such that the tops of the bends of the respective lamps face upward, and the lamps are crossed at intervals with the tops as the centers. Weather resistance tester.