JP2005321371A - Sheet for measuring ultraviolet ray transmission amount, device for measuring ultraviolet ray transmission amount, and method for measuring ultraviolet ray transmission using the sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet body for simply measuring and evaluating ultraviolet ray transmission of various cloth-like specimens, and to provide a method for measuring and evaluating ultraviolet ray transmission using the sheet body. <P>SOLUTION: In the sheet 1 for measuring an ultraviolet ray transmission amount, a sheet-like base substance is dyed by a dye in which light resistance is blue scale one class or less regulated in JIS L 0842 after 20 hours of light irradiation of an ultraviolet ray carbon arc lamp. The dye is preferably C.I. mordant green 17, and the sheet-like base substance is dyed without mordanting. Nylon textiles, cation cotton fabrics, hemp textiles, rayon fabrics, leather, wool yarn textiles, silk textiles, paper and the like are mentioned as the sheet-like base substance. In the device for measuring the ultraviolet ray transmission amount, the sheet 1 for measuring the ultraviolet ray transmission amount is stored in an envelope body 2 comprising an ultraviolet ray transmissive material, and at least one ultraviolet ray irradiation open hole 3 is provided in one face of the envelope body 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sheet body (sheet for measuring the amount of UV transmission) used for measuring the UV transmittance of an object to be tested (generally a cloth) that is an evaluation object, and the sheet is made of a material that is not UV transparent. The present invention relates to an ultraviolet ray transmission amount measuring apparatus accommodated in an envelope body and an ultraviolet ray transmission measuring method using the sheet.

Many devices and methods for measuring the amount of ultraviolet rays have been proposed so far, and various materials that develop or fade when exposed to ultraviolet rays are also known. However, known dyes that change color tone by irradiation with ultraviolet rays are suitable for direct discoloration by direct exposure to ultraviolet rays, so that they are transmitted from the front side to the back side of a fabric-like specimen. It was unsuitable for measuring the amount of ultraviolet rays.
Examples of the device for measuring the amount of transmitted ultraviolet light include those described in Patent Documents 1 to 3 below, and all of the devices described in Patent Documents 1 to 3 are ultraviolet rays in the light receiving unit. The apparatus is expensive for mechanically measuring the illuminance, and it cannot be easily measured.
JP-A-5-248944 JP-A-5-248945 JP 2002-296180 A

  An object of the present invention is to solve the above-mentioned problems and to provide a sheet body that can easily measure and evaluate the ultraviolet transmittance of a fabric-like object to be tested. Moreover, this invention makes it a subject to provide the apparatus and method which can evaluate the ultraviolet-ray transmittance of various fabric-like test objects easily by using such a sheet | seat body.

In order to solve the above problems, the ultraviolet ray transmission amount measuring sheet of the present invention is a sheet body used for measuring the ultraviolet transmittance of a test object, and the sheet-like base material constituting the sheet body is an ultraviolet ray. It is characterized by being dyed with a dye whose light resistance after 20 hours of irradiation with a carbon arc lamp is a blue scale grade 1 or less as defined in JIS L 0842.
The present invention also relates to the ultraviolet ray transmission amount measuring sheet having the above characteristics, wherein the dye is C.I. I. Modern Tread 7, C.I. I. Modern Violet 1, C.I. I. Modern Blue 1, C.I. I. Modern Blue 17, C.I. I. Modern Black 1, C.I. I. Modern Black 9, C.I. I. Modern Black 11, C.I. I. Modern Blue 29, C.I. I. Modern Blue 3, C.I. I. Modern Green 17, C.I. I. It is selected from the group consisting of modern green 28, and is characterized in that the dye is dyed on the sheet-like substrate without mordanting.
Furthermore, the present invention is the ultraviolet ray transmission amount measuring sheet having the above characteristics, wherein the sheet-like base material is made of nylon fabric, cationized cotton fabric, hemp fabric, rayon fabric, leather, wool fabric, silk fabric and paper. It is also characterized by being selected from a group.

Further, according to the present invention, the above-mentioned ultraviolet ray transmission amount measuring sheet is accommodated in an envelope made of a non-ultraviolet material, and at least one ultraviolet irradiation opening is provided on one surface of the envelope. It is also an ultraviolet ray transmission amount measuring device characterized by being provided with holes.
Further, according to the present invention, in the ultraviolet transmission measuring apparatus having the above-described features, a structure in which a sheet body (transparent sheet body) made of a transparent material is laminated on the surface of the ultraviolet transmission measurement sheet. It is also characterized by being.

Furthermore, the present invention is a method for measuring the ultraviolet transmittance of a test object using an ultraviolet transmittance measuring sheet capable of measuring the ultraviolet transmittance, and the method comprises the following steps A to C:
Step A: a step of preparing the ultraviolet ray transmission amount measuring sheet according to any one of claims 1 to 3,
Process B: A process of irradiating ultraviolet rays in a state where an ultraviolet irradiation part and an ultraviolet non-irradiation part are formed on the surface of the test object, by laminating the test object in close contact with the surface of the ultraviolet ray transmission amount measurement sheet, as well as,
Step C: including a step of evaluating the ultraviolet transmittance of the DUT from the color difference between the ultraviolet ray irradiation portion and the ultraviolet ray non-irradiation portion in the ultraviolet ray transmission amount measurement sheet after being irradiated with the ultraviolet ray in the step B. It is also a feature.
Further, the present invention provides the test object after laminating a sheet body made of a transparent material on the surface of the ultraviolet ray transmission amount measuring sheet in the step B in the ultraviolet ray transmission amount measuring method having the above characteristics. It is also characterized by laminating bodies.

  The sheet for measuring the amount of transmitted UV light of the present invention is suitable for simply measuring and evaluating the UV transmittance of a cloth-like object to be tested. Further, by the method of the present invention using such a sheet body, it is possible to easily evaluate the ultraviolet transmittance of various fabric-like test bodies without using an expensive measuring instrument. Further, by laminating a transparent sheet body such as a polyethylene film or a glass plate on the surface of the sheet for measuring the amount of transmitted ultraviolet light, the sensitivity of measuring the amount of transmitted ultraviolet light compared to the case where such a sheet body is not laminated. This makes it suitable for evaluating and measuring the amount of ultraviolet light transmitted in a short time.

  First, the dye used for the ultraviolet ray transmission amount measuring sheet of the present invention will be described. The dye used in the present invention has a light resistance after 20 hours of irradiation with an ultraviolet carbon arc lamp, which is a blue scale grade 1 or less as defined in JIS L 0842. Such dyes include acid mordant dyes. Among them, those having —N═N— (azo group) in the structure can be used. I. Modern Tread 7, C.I. I. Modern Violet 1, C.I. I. Modern Blue 1, C.I. I. Modern Blue 17, C.I. I. Modern Black 1, C.I. I. Modern Black 9, C.I. I. Modern Black 11, C.I. I. Modern Blue 29, C.I. I. Modern Blue 3, C.I. I. Modern Green 17, C.I. I. Modern green 28, and C.I. I. Modern green 17 is preferred, but triphenolmethane or the like can also be used. C. most suitable for the present invention. I. Modern Green 17 is Mordant Green F (Mitsui Toatsu Chemicals), Sanchromin Green LG conc. (Made by Sumika Chemtex Co., Ltd.) and Mordant Green 501 (manufactured by Yamada Chemical Co., Ltd.) can be used, and various UV measurements can be performed easily and inexpensively by applying the characteristics.

  And in this invention, the above-mentioned acidic mordant dye is dyed to a sheet-like base material, without making it react with a metal, without mordanting. In the present invention, by not performing the mordanting treatment (unmordanting) in this way, an appropriate discoloration for ultraviolet irradiation can be obtained, and even when the same dye is used, a sheet-like substrate By selecting the material, it can be used as a short-time ultraviolet irradiation measurement sheet or a long-time ultraviolet irradiation measurement sheet. That is, examples of the sheet-like base material suitable for short-time ultraviolet irradiation measurement include nylon fabric (6-nylon fabric, 6,6-nylon fabric), cationized cotton fabric, hemp fabric, rayon fabric, leather, etc. The color changes gradually in the ultraviolet irradiation time of 10 minutes to 180 minutes in a general xenon fade meter (ultraviolet light resistance tester, manufactured by Suga Test Instruments). Among these, the most suitable sheet-like substrate for short-time ultraviolet irradiation is a nylon fabric. On the other hand, examples of the sheet-like base material suitable for long-time ultraviolet irradiation measurement include wool woven fabric, silk woven fabric, paper, etc., even when the same dye is used without mordanting, The ultraviolet irradiation time changes in steps from 180 minutes to 900 minutes.

  The sheet for measuring the amount of ultraviolet light transmission of the present invention obtained by dyeing the dye on such a sheet-like base material has the amount of ultraviolet light transmitted through a cloth-like object to be tested, for example, clothing, curtains, etc. It can be measured in a short time, and the ultraviolet ray transmission amount of glass and synthetic resin (film, corrugated sheet) can be measured in the same manner. Moreover, it is also possible to measure the amount of reflected ultraviolet light from various objects using the sheet for measuring the amount of transmitted ultraviolet light of the present invention, and can be applied to the reflection measurement of ultraviolet light such as walls, roads, snow, clouds, etc. It is also possible to measure the UV transmittance of plant leaves and flowers.

  Next, the ultraviolet transmission measuring device of the present invention will be described. The ultraviolet ray transmission amount measuring apparatus of the present invention has a configuration in which the above-described ultraviolet ray transmission amount measurement sheet is housed in an envelope made of an ultraviolet non-transparent material, and the envelope body has one surface. Is provided with at least one ultraviolet irradiation hole so that an ultraviolet irradiation part and an ultraviolet non-irradiation part are formed on the surface of the sheet. FIG. 1 is an external view showing an example of the ultraviolet ray transmission amount measuring apparatus of the present invention, (a) is a view when a surface provided with an ultraviolet irradiation aperture 3 is viewed, and (b), It is a figure when the surface on the opposite side is seen.

As shown in FIGS. 1 (a) and 1 (b), in the ultraviolet ray transmission amount measuring apparatus of the present invention, the ultraviolet ray transmission amount measuring sheet 1 dyed with the above-described dye is not ultraviolet-transmissive. In this case, the envelope body 2 is housed in an envelope 2 on one surface, so that an ultraviolet irradiation portion and an ultraviolet non-irradiation portion are formed on the surface of the sheet 1. At least one ultraviolet irradiation aperture 3 is provided. FIG. 1 illustrates an example in which one circular ultraviolet irradiation aperture 3 is provided, but the number and shape of the apertures 3 are not limited to this, and the ultraviolet irradiation unit and the ultraviolet rays are not limited thereto. It suffices if the color difference between the non-irradiated parts can be discriminated. Also, the material constituting the envelope 2 may be any material that does not transmit ultraviolet light and can be easily mounted so that an ultraviolet irradiation part and an ultraviolet non-irradiation part are formed on the surface of the ultraviolet ray transmission measuring sheet 1. For example, paper, cloth, film, synthetic resin, leather, metal and the like can be mentioned. The envelope 2 in the ultraviolet transmission measuring device illustrated in FIG. 1 is made of paper, and a gluing portion 4 is provided so that the ultraviolet transmission measuring sheet 1 can be inserted and removed from the lateral direction.
FIG. 2A is a view showing the outer appearance of the envelope 2 after the ultraviolet transmission measurement sheet 1 of the ultraviolet transmission measurement apparatus of the present invention illustrated in FIG. 1 is pulled out in the lateral direction (right side in the drawing). (B) is a figure which shows the external appearance of the sheet | seat 1 for ultraviolet-ray transmission amount measurement withdrawn.

  A preferable example of the ultraviolet ray transmission amount measuring apparatus of the present invention is a black measuring instrument in which an opening for ultraviolet irradiation is provided on the surface of a small envelope, and the size of the envelope and the opening can be freely set depending on the measurement purpose. As a product, a hole with an inner diameter of about 2 cm is provided on the surface of a 10 cm × 6.5 cm black paper envelope, and a 10 cm × 3.5 cm sensor mount (for example, paper using the above-mentioned dye is placed in the envelope. (Stained) is inserted (see FIGS. 1 and 2). When using such a device, use it with the sensor side facing the envelope side at the time of measurement, and pull out the sensor mount at the end of measurement and insert it into the envelope with the sensor side facing the back side. However, although ultraviolet rays are not irradiated, the ultraviolet ray amount measuring device of the present invention is not limited to such a configuration.

The ultraviolet ray transmission amount measuring device of the present invention has a structure in which a sheet body made of a transparent material is laminated on the surface side of the ultraviolet ray transmission amount measurement sheet in order to increase the ultraviolet ray measurement sensitivity of the measurement sheet. 3 (a) and 3 (b), as an example of the ultraviolet ray transmission amount measuring apparatus of the present invention, the ultraviolet ray transmission amount measurement is performed so that the transparent sheet body 5 is positioned on the opening 3 side of the envelope body 2. Having a structure in which the sheet 1 and the transparent sheet 5 are put in the envelope body 2 in a laminated state ((a) is a front view, (b) is a layer structure when viewed from the right side) However, the present invention is not limited to such a form, and the measurement device described in FIG. 1 may have a structure in a bag made of a transparent material. .
In the present invention, examples of the transparent sheet suitable for increasing the UV measurement sensitivity of the measurement sheet include a commercially available colorless polyethylene film, nylon film, cellophane film, polyvinylidene chloride film, and the like, and a glass plate is used. It is also possible.
In the present invention, (test fabric / transparent sheet body / ultraviolet transmission amount measurement sheet) laminate rather than the case where (UV) / UV transmission amount measurement sheet is irradiated with ultraviolet rays from the fabric under test side. When the ultraviolet ray is irradiated from the fabric side to be tested, the degree of discoloration of the ultraviolet ray transmission amount measuring sheet is increased, and thus the ultraviolet ray permeability of the fabric to be tested is measured and evaluated with high sensitivity in a short time. Can do.

  The method of the present invention for measuring the ultraviolet transmittance of a test object using the above-described ultraviolet ray transmission amount measuring sheet and ultraviolet ray transmission amount measuring apparatus includes the following steps A to C. A sheet for measuring the amount of transmitted UV light is prepared. For example, in order to produce a sheet for ultraviolet irradiation for a short time, the above-mentioned acidic mordant dye (for example, C I. Modern Green 17) and nylon taffeta are immersed in a dyeing bath containing ammonium sulfate and a surfactant at room temperature, and then gradually heated to maintain this temperature for a certain period of time. Allow to cool, wash with water and dry. At this time, mordanting is not carried out, and the dye concentration in the dyeing bath is 0.05 to 0.2% owf, preferably around 0.1% owf, so that the influence of ultraviolet rays is emphasized and an extremely light color is obtained. Preferably there is.

  In the second step B, the surface of the ultraviolet ray transmission amount measurement sheet obtained in the step A is laminated in a state in which a test object that is an object for measuring the ultraviolet ray transmission amount is in close contact, The surface of the test object is irradiated with ultraviolet rays using a fade meter or the like so that an ultraviolet irradiation portion and an ultraviolet non-irradiation portion are formed. The ultraviolet irradiation time at this time is appropriately selected depending on the ultraviolet transmittance of the test object and the ultraviolet sensitivity of the ultraviolet ray transmission amount measuring sheet. In the present invention, in this step B, it is preferable to laminate the sheet body made of the above-described transparent material between the ultraviolet ray transmission amount measuring sheet and the test object, By irradiating ultraviolet rays so that an ultraviolet irradiation part and an ultraviolet non-irradiation part are formed in the laminated state, the ultraviolet transmittance of the test fabric is measured in a shorter time than when the transparent sheet is not laminated.・ It becomes possible to evaluate.

Finally, in the third step C, the ultraviolet transmittance of the DUT is evaluated from the color difference between the ultraviolet ray irradiated portion and the ultraviolet ray non-irradiated portion in the ultraviolet ray transmission amount measurement sheet after the ultraviolet ray irradiation in the step B. To do. At this time, the color difference between the ultraviolet irradiation part and the ultraviolet non-irradiation part may be evaluated by visual observation, or may be evaluated by an instrument using a color measuring device.
Examples of the present invention will be described below, but the present invention is not limited thereto.

Example I: Experiments for evaluating ultraviolet transmittance of various test fabrics using the sheet for measuring the amount of UV transmission of the present invention when the transparent sheet is not laminated [Method for producing sheet for measuring the amount of UV transmission of the present invention]
Nylon taffeta (manufactured by Unitika) was prepared as a sheet-like substrate, and an acid mordant dye, Sunchromine Green LG (manufactured by Sumika Chemtex) 0.1% owf, ammonium sulfate 2% owf, a nonionic surfactant (Neugen HC, No. 1) After the nylon taffeta is immersed in a temperature range of 20-30 ° C. in a dyeing bath having a composition of 1% owf, the temperature is gradually raised to 98 ° C., and this temperature is maintained for 30 minutes. After cooling to room temperature, washing with water and drying, the ultraviolet ray transmission measuring sheet of the present invention was obtained.

[Method for Fabricating Test Fabric]
As a dyeing solution for producing a fabric to be tested, Chrome Yellow RCN (manufactured by Yamada Chemical) 0.1% owf, Chrome Red GN-N (manufactured by Yamada Chemical) 0.02% owf, Sunchromine Green LG (manufactured by Sumika Chemtex) ) A composition having a composition of 0.015% owf was prepared, and the fabrics of the materials described in Table 1 below were immersed in this dyeing solution without performing mordanting (Examples 1 to 3 and 6) / Mordant (Examples 4 and 5) was taken out, washed with water and dried to obtain each fabric to be tested.

[Ultraviolet irradiation test method]
A fade meter (manufactured by Suga Test Instruments Co., Ltd.) was formed by laminating two layers of the fabric to be tested on the surface of the ultraviolet ray transmission amount measurement sheet obtained as described above, and forming an ultraviolet irradiation part and an ultraviolet non-irradiation part. Was irradiated with ultraviolet rays for 120 hours from the fabric side to be tested.
Then, the difference in color (degree of fading) between the UV-irradiated part and the UV-irradiated part of the UV-transmitted sheet on the lower side of the two fabrics to be tested after UV irradiation and the UV non-irradiated part is visually observed. Evaluated. In the evaluation, an evaluation of “1” is given when the degree of fading is remarkably large, “5” is given when there is almost no discoloration, and “2”, “3”, As "4", it was classified into five categories as a whole.
The results are shown in Table 1 below.

From the results of Table 1 above, the sheet for measuring the amount of UV transmission of the present invention is suitable for evaluating the UV transmission performance of various fabrics having different UV transmission, and the color changes sensitively depending on the degree of UV transmission. It was confirmed that
In addition, using a wool fabric as a sheet-like base material, the ultraviolet ray transmission amount measuring sheet of the present invention is prepared according to the above-described method for producing the ultraviolet ray transmission amount measuring sheet, and using this, the ultraviolet ray is irradiated with a fade meter for 720 minutes. As a result, fading (discoloration) of the ultraviolet ray transmission amount measuring sheet occurred in the same order as in Table 1 above, and by comparing the degree of fading, the ultraviolet transmittance of the test specimen (various fabrics) was easily measured. It was possible to evaluate.

Example II: Comparison of UV transmittance of nylon-dyed fabric with UV-transmitting sheet according to the present invention when transparent sheets were laminated and 50 g of Sunchromine Green LG (manufactured by Sumika Chemtex) Dissolve in about 100 cc of hot water at 60 ° C., add water (tap water) to the resulting solution to make 700 cc as a whole, immerse a commercially available drawing paper in the obtained dyeing solution for about 30 seconds, take out, and remove ultraviolet rays. Was dried at room temperature in a place not exposed to UV light, and the ultraviolet ray transmission amount measuring sheet of the present invention was produced. Moreover, about the fabric to be tested, the nylon fabric fabric to be tested in Example 3 was used, and a commercially available colorless polyethylene film (thickness: 40 μm) was prepared as the transparent sheet.
It has the laminated structure of the above-mentioned fabric to be tested / transparent sheet / ultraviolet ray transmission amount measuring sheet of the present invention having the laminated structure of the present invention and the above-mentioned fabric to be tested / ultraviolet ray transmission amount measuring sheet. The measurement device was prepared, and the degree of discoloration of the measurement sheet by sunlight irradiation for 10 to 150 minutes was evaluated according to the same evaluation criteria as in Example I above. The results are shown in Table 2 below.

  From the results of Table 2 above, the ultraviolet transmission measuring device of the present invention having a structure in which a transparent sheet (colorless polyethylene film) is laminated on the upper surface of the ultraviolet transmission measurement sheet is a measurement in which the transparent sheet is not laminated. The degree of discoloration of the measurement sheet due to ultraviolet irradiation is larger than that of the apparatus, and not only the nylon-dyed fabric used in Example II above, but also various fabrics that are difficult to transmit ultraviolet rays (for example, cobalt mordanted silk fabric, cobalt mordanted nylon fabric, wool fabric) It has been confirmed that it is suitable for measuring and evaluating the ultraviolet transmittance of a high-sensitivity in a short time with high sensitivity.

BRIEF DESCRIPTION OF THE DRAWINGS It is an external view which shows an example of the ultraviolet-ray transmission amount measuring apparatus of this invention, (a) is a figure when seeing the surface in which the opening 3 for ultraviolet irradiation was provided, (b) is the other side. It is a figure when the surface is seen. (A) is a figure which shows the external appearance of the envelope body 2 after drawing out the ultraviolet-ray-transmission-measuring sheet | seat 1 of the ultraviolet-transmission measuring device of this invention illustrated in FIG. 1 to the horizontal direction (right side of drawing). (B) is a figure which shows the external appearance of the sheet | seat 1 for ultraviolet-ray transmission amount measurement withdrawn. An example of the ultraviolet ray transmission amount measuring apparatus of the present invention having a structure in which a sheet body 5 made of a transparent material is laminated on the surface side of the ultraviolet ray transmission amount measuring sheet 1 and placed in the envelope body 2. It is a figure shown, (a) is a front view, (b) is the schematic when it sees from a side.

Explanation of symbols

1 UV transmission sheet (UV transmission sensor)
2 Envelope body 3 Opening for ultraviolet irradiation 4 Gluing part 5 Transparent sheet body (transparent cover film)

Claims (7)

A sheet body used to measure the ultraviolet transmittance of a test object, and the sheet-like substrate constituting the sheet body has a light resistance after 20 hours of irradiation with an ultraviolet carbon arc lamp as defined in JIS L 0842. The ultraviolet ray transmission amount measuring sheet is characterized by being dyed with a dye having a blue scale grade 1 or less. The dye is C.I. I. Modern Tread 7, C.I. I. Modern Violet 1, C.I. I. Modern Blue 1, C.I. I. Modern Blue 17, C.I. I. Modern Black 1, C.I. I. Modern Black 9, C.I. I. Modern Black 11, C.I. I. Modern Blue 29, C.I. I. Modern Blue 3, C.I. I. Modern Green 17, C.I. I. 2. The ultraviolet ray transmission amount measurement according to claim 1, wherein the dye is selected from the group consisting of modern green 28, and the dye is dyed on the sheet-like substrate without mordanting. Sheet. 3. The sheet-like substrate is selected from the group consisting of nylon fabric, cationized cotton fabric, hemp fabric, rayon fabric, leather, wool fabric, silk fabric and paper. Sheet for measuring the amount of UV transmission. The ultraviolet ray transmission amount measuring sheet according to any one of claims 1 to 3 is accommodated in an envelope made of an ultraviolet non-transparent material, and at least on one surface of the envelope body An ultraviolet ray transmission amount measuring apparatus, wherein one ultraviolet ray irradiation aperture is provided. 5. The ultraviolet ray transmission amount measuring apparatus according to claim 4, wherein a sheet body made of a transparent material is laminated on the surface side of the ultraviolet ray transmission amount measuring sheet. A method for measuring the ultraviolet transmittance of a test object using an ultraviolet ray transmission amount measuring sheet capable of measuring an ultraviolet ray transmission amount, which method comprises the following steps A to C:
Step A: a step of preparing the ultraviolet ray transmission amount measuring sheet according to any one of claims 1 to 3,
Process B: A process of irradiating ultraviolet rays in a state where an ultraviolet irradiation part and an ultraviolet non-irradiation part are formed on the surface of the test object, by laminating the test object in close contact with the surface of the ultraviolet ray transmission amount measurement sheet, as well as,
Step C: including a step of evaluating the ultraviolet transmittance of the DUT from the color difference between the ultraviolet ray irradiation portion and the ultraviolet ray non-irradiation portion in the ultraviolet ray transmission amount measurement sheet after being irradiated with the ultraviolet ray in the step B. A method for measuring ultraviolet light transmittance. 7. The ultraviolet ray transmitting property according to claim 6, wherein in the step B, a sheet body made of a transparent material is laminated on the surface of the ultraviolet ray transmission amount measuring sheet, and then the test object is laminated. Measuring method.

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