JP2724060B2 - Weather tester and sample holder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to plastics, fibers,
The present invention relates to a weather tester and a sample holder for accelerating tests for deterioration of various materials such as coating films and products.

[0002]

2. Description of the Related Art As shown in FIG. 6, a conventional weather tester is provided with a single light source 2 in the center of a temperature and humidity adjustable test tank 3 around which a sample rotating frame 5 holding a sample rotates. The mainstream was to test materials and products. However, in recent years, the number of materials and products having good weather resistance has increased, and the time required for testing has become longer. For this reason, a large number of weathering test machines are required to perform these evaluations accurately and quickly, and the cost required for the test apparatus, the installation place of the apparatus, the maintenance cost, and the like have been greatly increased.

Therefore, a weather tester as shown in FIG. 5, which can double the number of samples to be tested at a time while satisfying the performances of the apparatus shown in FIG. 6, has been developed and used. As shown in the figure, this apparatus includes a light source 2 and a test tank 3 whose temperature and humidity can be adjusted.
The two xenon lamps held vertically are arranged vertically one by one on a vertical axis passing through the center of the test tank, and the sample rotating frames 5a and 5b for mounting the sample holder 4 holding the sample are independent. Each light source 2 is provided so as to be rotatable around the center (the vertical axis is the center). Also, with the increase in test time, it has become necessary to strictly control the uniformity of temperature as well as the irradiance received by the sample.

For example, in the case of a device using a xenon lamp as a light source, a light receiver for receiving irradiance is placed at the same position as the sample surface, and the input power of the lamp is controlled based on a change in the amount of received light. A device that always keeps constant is generalized and can be controlled relatively easily and uniformly.

However, the temperature varies depending on various factors such as the shape of the test tank, the flow of the circulating air in the test tank, the speed and the amount thereof, so that hot air simply controlled at a predetermined temperature is supplied to the inside of the test tank. However, it was difficult to achieve uniformity. In the apparatus of FIGS. 5 and 6, although not shown in detail, a disk-shaped wind-direction plate 16 smaller than the lower frame 5b of the sample rotating frame is provided below the lower frame, and the control air supplied from the lower part of the test tank is provided. The purpose of this method is to rectify the circulating air whose temperature is controlled and the air volume and the air velocity are kept constant, pass the circulating air through the back surface of the sample holder and around the light source to make the temperature received by the sample uniform. Further, a similar system is widely used as temperature control of a weather tester.

FIG. 7 is a cross-sectional view of the rotating sample frame portion shown in FIGS. 5 and 6. In the drawing, the sample holder is a modified U-shaped 3 with a trapezoidal flat plate 20 fixed to the upper end and a flat plate 22 fixed to the lower end of the sample holder of the present invention shown in FIG. Step sample holder. Now, the circulating air in the apparatus shown in FIGS. 5, 6 and 7 flows as indicated by the arrows in the figures. In other words, a lot of air flows upward while licking the entire back surface while colliding with the lower back surface of the sample holder, and a small amount of other air flows from between the wind direction plate and the lower frame to the lower surface of the sample holder. It flows upward in the direction of the ramp so as to lick the lamp.

[0007]

In the conventional weathering tester as described above, since a larger amount of circulating air hits the lower back surface and lower surface than the other parts of the sample holder, a table showing test results described later is provided. As shown in Fig. 1, in the sample held in the sample holder, the temperature of the lower sample was extremely low,
Variations occurred depending on the position where the sample was held. Therefore, the number of materials and products with good weather resistance has increased, and the test time has become longer.In the case where the same sample is tested simultaneously, different test results will occur depending on the position where the sample is held, and the evaluation cannot be performed. Are also coming out. For this reason, the development of an apparatus that does not cause temperature variations in the held sample has been an issue.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention firstly comprises a temperature control and humidity control chamber, and further comprises a sample which rotates independently around two light sources and holds the sample. It has a sample rotating frame with upper and lower frames for mounting the holder, and controls the sample temperature by controlling the temperature and temperature of the circulating air in the test chamber or by controlling the temperature and humidity of the circulating air. In the test machine, a vertical height attached to the upper frame of the sample rotating frame is up to 15 cm, and the upper end circumference of the cylinder is up to 15 cm in the horizontal direction from the upper frame. ,
It is located below the lower frame of the sample rotation frame and is located within a range where the width of the lower frame is at most 15 cm and the circumference of the lower frame exists between the inner circumference and the outer circumference, and a gap is provided between the lower frame and the lower frame. And a horizontal ring-shaped lower wind direction plate.

Secondly, in the above-mentioned weathering tester, when the sample holder is mounted on the sample rotating frame without any gap, it forms the same frustoconical shape as the first upper wind direction plate and lower wind direction. A sample holder comprising the upper and lower ends of the sample holder is provided so as to form the same horizontal ring-shaped lower wind direction plate as the plate.

Third, in the above weather tester, when the wind direction adjusting device mounts the sample holder on the sample rotating frame without any gap, the height in the vertical direction is up to 15 cm, and the circumference of the cylinder top is from the top of the sample holder. The upper wind direction plate, which is attached to the upper end so as to form a truncated cone of up to 15 cm in the horizontal direction, and whose lower bottom is composed of a trapezoidal flat plate whose width matches the width of the upper end of the holder, and the lower frame of the sample rotation frame A horizontal ring-shaped lower wind direction plate which is located below and has a width of up to 15 cm and whose inner and outer peripheries are located within a range corresponding to the circumference of the lower frame, with a gap provided between the lower frame and the lower frame. It is composed of

[0011]

In the present invention, by providing the above-mentioned wind direction adjusting device, most of the circulating air sent from below the test tank of the weathering test machine hits the lower wind direction plate and passes through the back surface of the sample holder. Flows upward. A small portion enters the inside of the sample frame but does not flow near the sample holder but flows around the light source and goes upward. The circulating air that has passed through the back surface of the sample holder enters the temperature and humidity control chamber through the air suction port at the top of the test tank, and returns to the test tank at a predetermined temperature and humidity. For this reason, the air near the upper portion of the sample holder is sucked from the air suction port and is not in a rectified state, so that much air hits the upper rear surface of the sample holder. The upper wind direction plate guides this flow further upward to reduce the air hitting the upper back surface of the sample holder. Therefore,
The circulating air is rectified near the sample holder by the lower wind direction plate and the upper wind direction plate, so that the sample temperature can be kept constant.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. Embodiment 1 FIG. 1 shows a weather tester 1 of Embodiment 1. In FIG.
Two xenon lamps held vertically as light sources 2 are arranged one above the other on a vertical axis passing through the center of the test tank 3, and a sample rotating frame for mounting a sample holder 4 holding a sample is provided. Independently, the upper sample rotation frame 5a and the lower sample rotation frame 5b are provided so as to be rotatable around their respective light sources (centering on the vertical axis). A temperature and humidity control chamber 10 including a blower 6, a heater 7, a cooler 8, a humidifier 9 and the like for circulating temperature- and humidity-controlled air in the test tank 3 to control the temperature and humidity in the tank. It is provided adjacent to the test tank 3. Further, although not shown, the irradiance applied to the sample surface is controlled to be always constant. In addition, the sample rotating frame placed above the test tank is the upper sample rotating frame.
5a, the lower one is arranged as a lower sample rotating frame 5b, and the upper frame 12 shown in FIG. 2 is supported by the upper frame support 23 and the lower frame 14 is supported by the lower frame support 24.

In the above weather tester, as shown in FIG. 2, the upper wind direction plate 11 has a cylindrical shape with a narrowed upper part (a truncated conical cylindrical shape).
The height is 5 on the vertical line from the upper end of the upper frame 12 to the upper end of the cylinder.
The narrowing of the upper end of the cylinder is 4 cm horizontally from the upper end of the upper frame 12, and the lower periphery is fixed to the upper end of the upper frame 12. Further, the lower wind direction plate 13 is arranged horizontally with a constant width gap provided below the lower frame 14 by matching the inner circumference of a ring-shaped flat plate having a width of 4 cm with the circumference of the lower frame. It is fixed to the lower frame 14 via a support 15. The upper wind direction plate 11 and the lower wind direction plate 13 are attached to the upper frame 12 and the lower frame 14 of each of the sample rotating frames 5a and 5b which are vertically arranged independently, and are integrally configured to form a wind direction adjusting device. is there.

With such a configuration, the test tank 3
The circulating air sent from the lower part flows as follows. (A) Most of the circulating air rises toward the tank wall of the test tank 3 by the wind direction plate 16 as shown in FIG. (B) Most of the air in (a) hits the lower wind direction plate 13 of the lower sample rotating frame 5b and rises through the back surface of the sample holder 17. (C) A small amount rises between the lower wind direction plate 13 and the wind direction plate 16 toward the ramp. (D) The air above the lower sample rotation frame 5b hits the lower wind direction plate 13 of the upper sample rotation frame 5a and rises through the back surface of the sample holder 17. (E) The air above the lower sample rotation frame 5b is
And a small amount rises in the lamp direction from between the upper sample rotating frame 5a. (F) The air near the upper part of the upper sample rotating frame 5a is sucked into the air inlet 18 from above the upper wind direction plate 11. With such a flow of the circulating air, it is possible to prevent the air from hitting the lower and upper portions of the sample holder 17 much.

Second Embodiment FIG. 4 shows a second embodiment. This weathering test machine is a combination of the test machine shown in the first embodiment and the three-stage sample holder shown in the following third embodiment. Is fixed in the same manner, and a trapezoidal flat plate 20 similar to the upper part of the sample holder of Example 3 is fixed on the upper part of the sample holder. Accordingly, the trapezoidal flat plate functions as the wind direction plate when the sample holder similar to that of the third embodiment is mounted on the sample rotation frame similar to the first embodiment without any gap, and the wind direction adjusting device is used together with the lower wind direction plate. Configure.

Embodiment 3 The weather test apparatus of this embodiment uses a sample holder shown in FIG. The sample holder is a three-stage type sample holder having a U-shape with a modified upper end and lower end. Each sample holder 4 holds a sample 19 and is attached to the upper frame 12 and the lower frame 14. ing. The three-stage type sample holder is mounted on the sample rotating frame of the first embodiment without any gap through the upper frame and the lower frame, and a trapezoidal flat plate 20 is formed so that the upper portion is the same as the upper wind direction plate. Is fixed, and a flat plate 22 is fixed horizontally at a lower end portion by providing a gap of a fixed width via two columns 21 so that the lower portion becomes the same as the lower wind direction plate. .

The flow of the circulating air in the second and third embodiments is the same as that in the first embodiment. Next, an experiment was conducted using the apparatus of Example 1, and the results are shown in Table 1 in comparison with the case where the present invention was not used (prior art). This table shows the results of measuring the temperature of the surface of a three-stage sample holder attached to the upper and lower sample rotating frames while holding the sample on each of the upper, middle and lower stages. The temperature of the test tank was controlled by controlling the temperature of the circulating air so that the temperature of the black panel thermometer attached to the upper stage of the three-stage sample holder attached to the lower sample rotating frame became 63 ° C.

[0018]

[Table 1] As is clear from this table, in the case of using the apparatus of the present invention, the difference between the upper, middle, and lower sample surface temperatures was 4.1 ° C at the maximum, 0.2 ° C at the minimum, and 14 ° C at the maximum in the prior art as well as the minimum.
4.6 ° C. Also, the same good results as in Table 1 were obtained in the experimental results using the devices of Examples 2 and 3. still,
In Examples 1 to 3, the height of the upper wind direction plate is 15 cm, the horizontal distance is larger than 15 cm, and the width of the lower wind direction plate is
When it was larger than 15 cm, good results were not obtained as in the above experimental results, and were almost the same as the results of the prior art.

[0019]

As is clear from the above experimental results, the weather tester of the present invention uses the above-described wind direction adjusting device and the sample holder equipped with the wind direction adjusting device, thereby mounting the sample held on the sample holder. Since the temperature variation due to the position is reduced, even if the material and the product with good weather resistance are tested for a long time, the test results have less variation,
Accurate and reliable tests can now be performed.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a weather resistance tester used in Examples.

FIG. 2 is a configuration diagram of a wind direction adjusting device according to the first embodiment.

FIG. 3 is a configuration diagram of a sample holder according to a third embodiment.

FIG. 4 is a configuration diagram of a wind direction adjusting device according to a second embodiment.

FIG. 5 is a configuration diagram of a conventional weathering tester in which two light sources are arranged in a test tank.

FIG. 6 is a configuration diagram of a conventional weather resistance tester in which one light source is arranged in a test tank.

FIG. 7 is an explanatory view of a rotating sample frame portion of a conventional weathering tester.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Weather resistance tester 2 Light source 3 Test tank 4 Sample holder 5 Sample rotation frame 5a Upper sample rotation frame 5b Lower sample rotation frame 6 Blower 7 Heater 8 Cooler 9 Humidifier 10 Temperature and humidity control room 11 Upper wind direction plate 12 Upper frame 13 Lower wind direction plate 14 Lower frame 15 Post 16 Wind direction plate 17 Sample holder 18 Air suction port 19 Sample 20 Trapezoidal flat plate 21 Post 22 Flat plate 23 Upper frame support 24 Lower frame support

Claims (3)

(57) [Claims] 1. A test tank comprising a temperature and humidity control chamber, a sample rotating frame which rotates independently around two light sources, and has upper and lower frames for mounting a sample holder holding a sample. A weather resistance tester for controlling the sample temperature by controlling the temperature and humidity of the circulating air temperature or the temperature and humidity of the circulating air flow rate (air volume); An upper wind direction plate having a maximum height of 15 cm in the vertical direction and a top end circumference of the cylinder of up to 15 cm in the horizontal direction from the upper frame, and a frustoconical cylindrical upper shape plate; Is a maximum of 15 cm and is located within a range where the circumference of the lower frame exists between the inner circumference and the outer circumference, and a horizontal ring-shaped lower wind direction plate provided with a gap between the lower frame and the wind direction is adjusted. A weathering test machine provided as an apparatus. (2) When the sample holder is mounted on the sample rotating frame without any gap, the vertical direction height is up to 15 cm, and the cylinder top circumference is up to 15 cm in horizontal direction from the top of the sample holder. An upper wind direction plate, which is formed of a trapezoidal flat plate whose lower bottom is the same as the width of the upper end of the holder, attached to the upper end so as to form a truncated cone, (b) below the lower frame of the sample rotation frame It is composed of a horizontal ring-shaped lower wind direction plate with a maximum width of 15 cm and its inner and outer peripheries located within a range that matches the circumference of the lower frame, with a gap provided between the lower frame and the lower frame. The weather resistance tester according to claim 1, wherein the test is performed. 3. A circulating air temperature or a temperature-controlled humidified air in a test tank, which has a sample rotating frame which rotates around a light source and has a frame for mounting a sample holder holding a sample. In a sample holder used in a weather tester that controls the sample temperature by controlling the circulating air flow rate (air volume),
(B) When the sample holder is mounted on the sample rotating frame without any gap, the upper wind direction plate has a maximum height of 15 cm in the vertical direction, and a circular truncated cone with a circumference of the cylinder top of 15 cm in the horizontal direction from the top of the sample holder. A trapezoidal flat plate whose lower bottom is the same as the width of the upper end of the holder attached to the upper end of each sample holder so as to form; (b) the width when the holder is mounted on the sample rotating frame without gaps Each of the above-mentioned components is formed so as to form a horizontal ring-shaped lower wind direction plate having a maximum of 15 cm and an inner periphery and an outer periphery thereof located within a range corresponding to the circumference of the lower frame and having a gap between the lower frame and the lower frame. A sample holder for use in a weather tester, comprising: a flat plate attached to a lower end portion of the sample holder; and a wind direction adjusting device for making the flow of air flowing on the sample surface constant and making the temperature of the sample uniform. .