JPH0743318B2 - Weather resistance tester - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a technique for making a surface temperature of a sample uniform in a weather resistance tester.

[0002]

2. Description of the Related Art A weather resistance tester uses, for example, a sunshine arc lamp, a xenon arc lamp, and a metal halide lamp as a light source, and irradiates mainly the ultraviolet light among these irradiation lights to prevent deterioration of the sample due to light. This is an accelerated test. In addition to this light irradiation, temperature, humidity, rainfall,
The test is conducted under various conditions such as dew condensation.

FIG. 4 shows the Japanese Industrial Standard (JIS) B 77.
No. 54 "Xenon arc lamp type light resistance and weather resistance tester" is a weather resistance tester 1b that satisfies various conditions.

In the figure, a xenon arc lamp as a light source 6 is vertically arranged in the center of a test tank 10, and a sample 4 is vertically arranged on a rotating frame 7 which is rotated by a rotating device 15 provided in the lower part of the device. A so-called vertical sample holder 16 attached to the above is attached. Air is introduced from the lower part of the test tank 10 to maintain the surface temperature of the sample 4 constant and circulates in the test tank 10.

The surface temperature of the sample 4 is determined by the radiant energy from the light source 6 and the ambient temperature of the sample 4.
Here, in order to maintain the sample surface at a predetermined test temperature, since the weathering light test 1b is basically tested with the radiant energy of the light source 6 being constant, it is performed by adjusting the ambient temperature of the sample 4. Become.

The surface temperature of the sample 4 is controlled by the test tank 1
The circulating air sent from the lower part of 0 is made to flow so as to pass through the front and back sides of the sample 4, but various properties of the surface of the sample, such as brushing, are not affected by the air flow. Therefore, in general, a flow divider 17 or the like is used so that the back surface side of the sample 4 flows more than the front surface side. The surface temperature of the sample 4 is detected by a so-called black panel thermometer 18 arranged at the same position as the sample surface,
The temperature and the amount of the circulating air are adjusted so as to maintain the test temperature from the detected temperature.

In the apparatus 1b shown in the figure, a conditioning room 19 is provided adjacent to the test tank 10, and inside the conditioning room 19,
The circulating air is sucked and blown by a fan 21 which is rotated by a motor 20, and the circulating air is circulated with a constant amount and speed. The temperature is the heater 22 and the cooler 2.
3. The refrigerator 24 controls the temperature to a predetermined temperature, and the humidity is adjusted by a humidity generator (not shown). Further, reference numeral 25 in the drawing denotes a cooling water pipe for the xenon lamp.

Now, in the weather resistance tester 1b as described above,
Since the surface temperature and the irradiance of the sample 4 mounted on the vertical sample holder 16 were not uniform by any means, there were cases where the test results varied greatly. For this reason,
A labor-intensive method has been adopted in which the apparatus is stopped every predetermined time and the top and bottom of the sample 4 are switched so that the surface temperature and irradiance of the sample 4 become uniform.

Therefore, in order to eliminate these drawbacks,
Recently, for example, by utilizing the technique disclosed in Japanese Utility Model Laid-Open No. 58-30857, both ends as shown in FIG. 5 are provided so that the surface of the sample attached to the sample holder has uniform temperature and irradiance. A modified U-shaped three-stage sample holder 2b having a tilted portion has been used.

[0010]

A modified U-shaped sample holder 2b (irradiation of FIG. 5 using the technique disclosed in Japanese Utility Model Laid-Open No. 58-30857 is applied to the weather resistance tester 1b as described above. The six-window sample holder) is configured such that the surface of the sample 4 is located substantially on the light distribution curve of the light source, so that the irradiance received by the sample surface is substantially uniform as shown in Table 1.

[0011]

[Table 1]

The measurement of the irradiance in Table 1 above was carried out under the following conditions. That is, in the same apparatus as in FIG. 4, a 7.0 Kw xenon arc lamp was used as a light source, and the sample holder 2b in FIG. The measurement position of the irradiance is the position of A to F in FIG. 5 (the position of the dotted circle), and the irradiance of the D position is 120 W /
It is the ratio at each value when the value is controlled to 100 by controlling with m ² . In addition, the distance between the center of the light source and the position between C and D (the position of the black circle in the figure) was 240 mm, and white thick paper was attached as a dummy to the irradiation window 5 of each sample holder 2b.

Table 2 shows the results of measuring the surface temperature of the sample 4. To measure the surface temperature, a thermometer such as a thermocouple is used, and a sample holder 2b shown in FIG. The measurement was performed by attaching a thermometer such as a thermocouple to each sample surface position of a to f of No. 5.
The irradiance at this time was controlled to the same 120 W / m ² as in Table 1 above, and the temperature inside the test tank was controlled to 35 ° C. with a dry-bulb thermometer placed in a place where the light from the light source 6 was not directly applied, It is an average value measured 10 times at 10 minute intervals.
At this time, the air flowing on the front surface side and the back surface side of the sample 4 is
About 0.5 m / s on the front side of the sample and about 0.8 m / s on the back side
Therefore, it is a slight breeze that does not affect the properties of the sample surface.

[0014]

[Table 2]

From Table 2 above, the surface temperature of the sample 4 was different from the irradiance and was not uniform, and the temperatures at positions b, c and d were higher than those at other positions.
Therefore, even if the irradiance received on the surface of the sample is uniform, there are cases in which different test results occur at the mounting position of the sample 4 due to variations in the surface temperature of the sample 4.

Therefore, it is strongly desired to develop a weathering light tester in which the irradiance received on the sample surface is uniform in all the samples and the surface temperature is also uniform, and the test results do not vary depending on the mounting position of the sample. Was there.

[0017]

In order to solve the above-mentioned problems, in the weather resistance tester described above, both ends of the modified U-shape are arranged so that the sample is located on substantially the same light distribution curve of the light source. An inclined sample holder having a plurality of irradiation windows is provided, and an end of the irradiation window on the downstream side of the irradiation window and the irradiation window based on the flow direction of the air are part or all of the irradiation window. Make an opening with the downstream side end of the sample to be attached to, so that the width of the opening can be adjusted, to the front side or the back side of the irradiation window, move along the frame of the irradiation window side, and to the sample end. The means was that a sample stopper that came into contact was provided.

[0018]

By adopting the above-mentioned means, that is, with reference to the flow of air that is fed or circulated in the test tank to keep the sample temperature constant, the irradiation window of the sample holder is set to the downstream side of the flow. By forming an opening between the end of the sample and the end of the sample attached to the irradiation window, a large amount of air flows on the back side of the sample, so negative pressure is generated on the front side and the back side at this opening, and the sample front side The air flowing through the opening flows out from the front surface side to the back surface side of this opening. Therefore, the air flowing on the sample surface side uniformly hits the entire sample surface, and the temperature can be made uniform over the entire sample surface.

[0019]

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a front view and side view of a main part of a sample holder 2a to be attached to a weather light tester 1a of the present invention, and FIG. 2 is a partial perspective view of an example of a sample stopper 3.
FIG. 3 is a main part configuration diagram of a weather resistance tester 1a of the present invention to which the sample holder 2a shown in FIGS. 1 and 2 is attached.

Referring to FIG. 1, a weather resistance tester 1 of the present invention.
The sample holder 2a used for a has basically the same structure as the above-described conventional sample holder 2b, and the sample 4 is the light source 6a.
Of the modified U-shape in which both ends thereof are inclined so that they are located on substantially the same light distribution curve.
Individual) irradiation windows 5. Here, the inclination angles θ of both ends of the sample holder 2a used in this embodiment are about 28 °. That is, the sample holder 2a has a modified U-shaped three-step shape, and a step portion having the above-mentioned inclination angle is connected to both ends of the central step portion, and each step portion has an irradiation window of the same size. Two 5's are provided and configured.

Further, since the sample holder 2a is attached to an annular rotary frame 7 centered on the light source 6 (see FIG. 3), if the width of the frame 8 portion for forming the irradiation window 5 is the same, the rotary frame is the same. When trying to attach to 7 without a gap, a gap will be opened at both inclined step portions. For this reason, the frame 8 of both inclined step portions is configured to be narrowed from the width of the frame 8 of the central step portion toward the end portion.

The frame width is determined by the width of the sample holder 2a, the inclination angle (θ) of both ends of the sample holder 2a, and the distance from the light source 6. In this embodiment, the inclination angle (θ) of both inclined step portions is about 28 ° as described above, the size of each irradiation window 5 is about 51 mm × 41 mm, and the maximum width is about 86 mm at the central step portion. The minimum width is about 68 mm at both ends, and is configured as the sample holder 2a used when the distance from the center of the light source 6 to the center of the sample holder 2a (the position of the black circle in FIG. 1) is about 240 mm in FIG. I am doing it.

Further, as shown in FIG. 2, the sample stopper 3
In order to attach the frame, a long hole 9 of about 1.5 mm × 10 mm is provided at a target position with the sample 4 sandwiched in the frame 8. That is,
With reference to the flow of air circulating in the test tank 10, the irradiation window 5a located on the central step side and the two irradiations on the central step part in the two irradiation windows 5 of the inclined step part located on the downstream side thereof. The window 8 is provided on the frame 8 of the window 5b from the same position as the end portion of each irradiation window on the downstream side of the above-described air flow toward the end portion on the upstream side.

The frame of the sample holder 2a is bent at a right angle with a slight width from the side of the irradiation window 5, and its end is bent again so that it is parallel to the irradiation window. It has a shape. Further, this re-bent portion is configured such that the inclined step portion becomes narrower from the frame width of the central step portion toward the end portion. Further, each of the long holes 9 is provided in this portion of the frame 8.

The sample stopper 3 has a shape in which one side of a rectangular flat plate is provided with a certain width and is cut into two substantially equal parts, and one of them is bent at a right angle. The end of this bent portion is brought into contact with a slight width portion provided on the side portion of the irradiation window 5 as described above, and a small hole 11 (diameter of about 1.2 mm) is provided substantially at the center of the other portion. There is this hole 11
The center of is substantially coincident with the center line of the long hole 9. A screw 12 is passed through the hole 11 and the long hole 9 and fixed to the sample holder 2a by using a nut 13. Further, the frames 8 on both sides of the irradiation windows 5a and 5b are provided with graduations 14 (for example, at intervals of 2 mm) starting from the ends thereof. Therefore, the sample stopper 3 can be moved and adjusted within the range of the elongated hole 9. Further, by fixing each sample stopper 3 according to the scale 14, the irradiation windows 5a, 5a, 5a, 5b, 5c can be fixed.
In b, it can be easily fixed at the same position (the object across the irradiation window).

Irradiation window 5 provided with the sample stopper 3
When mounting the sample 4 in a and 5b, one end of the sample 4 is applied to the sample stopper 3 and fixed to the sample holder 2a with a sample fixture (not shown), so that the sample 4 is fixed between the sample end and the irradiation window end. A width opening 26 will be formed. Also, another irradiation window 5
Since the sample stopper 3 is not provided in the sample, the sample 4 is similarly attached by a sample fixture (not shown) so that the entire irradiation window is hidden. In this embodiment, the opening 26 is about 2 mm in the irradiation window 5a, about 3 mm near the irradiation window 5a among the two irradiation windows 5b in the central step, and one of them is about 7 mm.

In FIG. 3, the sample holder 2a is mounted on the light source 6 as shown in FIG.
It is a weather resistance tester 1a which is arranged side by side without a gap. This weather resistance tester 1a differs from the conventional weather resistance tester 1b described as FIG. 4 only in the mounting portion of the sample holder 2a, and the other configurations are the same.

Table 3 shows the sample surface temperatures when the test is conducted under the conditions that obtain the results shown in Tables 1 and 2. Table 3
A to f are measurement positions of the sample surface temperature corresponding to a to f in FIG. Further, for convenience, the same symbols as in FIG. 5 are used.

[0030]

[Table 3]

From Table 3, it can be seen that the sample surface temperature of the weather resistance tester 1a of this example is more uniform than the sample surface temperature of the conventional weather resistance tester 1b shown in Table 2.
That is, the difference between the maximum and the minimum of the sample surface temperature was 5 ° C. in the past, but is 1 ° C. in the present embodiment. or,
Although not shown, the irradiance ratio at this time was almost the same as in Table 1.

The weather resistance tester 1a of the above embodiment has a structure in which the light source 6 is arranged vertically and the sample holders 2a are arranged around the light source 6 without a gap, but although not shown, for example, a metal halide lamp or the like is used as the light source. In the weather resistance tester, since the original performance cannot be obtained by arranging the lamp vertically, the lamp is arranged horizontally. Even in this case, a sample holder similar to the sample holder 2a described in the above embodiment is arranged around a horizontally arranged light source without a gap so that a larger amount of circulating air flows from the front surface side of the holder to the back surface side thereof. It was found that with the above apparatus, a temperature as uniform as the sample surface temperature obtained in Table 3 can be obtained.

[0033]

[Effect] In the conventional weather resistance tester, the irradiance received by the sample could be made uniform, but the surface temperature could not be made uniform, so that the test results greatly varied due to the temperature difference.

According to the weather resistance tester of the present invention, the surface temperature can be made uniform as well as the irradiance received by the sample.
There is no variation in the test results, and the device can perform reliable tests.

[Brief description of drawings]

FIG. 1 is a front view and a side view of a sample holder used in a weather resistance tester of the present invention.

FIG. 2 is a partial perspective view of the back surface of FIG.

FIG. 3 is a configuration diagram of a main part of a weather resistance tester of the present invention.

FIG. 4 is a configuration diagram of a main part of a conventional weather resistance tester.

FIG. 5 is a front view and a side view of a sample holder used in a conventional weather resistance tester.

[Explanation of symbols]

 1a Weatherproof tester 2a Sample holder 3 Sample stopper 4 Sample 5 Irradiation window 5a Irradiation window 5b Irradiation window 6 Light source 7 Rotating frame 9 Long hole 10 Test tank 26 Opening

Claims (1)

[Claims] 1. A sample holder is arranged side by side on a sample frame rotating around a light source without a gap, and air is introduced or circulated into a test tank to maintain a constant temperature of the sample. In the weather resistance tester configured to flow more from the (irradiated surface) side to the back surface side, a plurality of samples with both ends inclined in a modified U-shape so that the sample is located on almost the same light distribution curve of the light source The sample holder having the irradiation window is arranged, and the irradiation window has a part or all of the irradiation window based on the flow direction of the air, and the end of the irradiation window on the downstream side and the downstream side of the sample attached to the irradiation window. A sample stopper that moves along the frame of the side of the irradiation window and is in contact with the sample end is provided on the front side or the back side of the irradiation window so that the opening can be adjusted with the end and the width of the opening can be adjusted. The air flowing on the front side of the sample is directed toward the back side of the sample. A weathering light tester, wherein the sample is made to flow through the opening to make the surface temperature of the sample uniform.