Face masks and inspection method of face masks

Abstract

To provide face masks and an inspection method of face masks that enable greater variation in design and facilitate the identification of welding defects.SOLUTION: A face mask 10 comprises a mask body 11 that covers the mouth and nose of a wearer. The mask body 11 has a first portion 18 constituting a left side portion of the mask body 11 and a second portion 19 constituting a right side portion of the mask body 11. The first portion 18 and the second portion 19 are welded together with back surfaces thereof facing each other at a boundary portion of the portions 18 and 19. A surface color of the first portion 18 is a first color C1, and a surface color of the second portion 19 is a second color C2, which is different from the first color C1. A welded portion 23 where the first portion 18 and the second portion 19 are welded is formed so that the second color C2 of the second portion 19 appears, when viewed from a surface side of the first portion 18, as a color different from the first color C1.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a mask and a method for inspecting the mask. [Background technology]

[0002] The mask has a mask body that covers the wearer's mouth and nose. The mask shown in Patent Document 1 has a mask body with a pair of left and right mask pieces that are welded together at their borders with their back surfaces facing each other.

[0003] In recent years, there has been an increasing demand for mask designs, and color masks, in which the mask body is colored in a color other than white, are now available in the market. In color masks, the entire mask body is colored in a predetermined color, such as pink or blue. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2022-100877 Summary of the Invention [Problem to be solved by the invention]

[0005] In the mask of Patent Document 1, it is anticipated that welding defects may occur in the welded portions where the mask pieces are welded to the mask body. Therefore, after welding, it is necessary to visually check whether welding defects have occurred in the welded portions. However, there is no significant difference in appearance between areas with welding defects and areas without welding defects. Therefore, it is considered difficult to visually check whether welding defects have occurred.

[0006] In addition, in recent years, user needs regarding mask designs have become more diverse. Therefore, there is a demand for a wide variety of mask designs to meet these needs. However, with the above-mentioned color masks, in which the entire mask body is colored in a predetermined color, there is a limit to the number of design variations that can be provided, and there is a risk that the masks will not be able to meet user needs.

[0007] The present invention has been made in consideration of the above circumstances, and its main object is to provide a mask and a mask inspection method that can increase the variety of mask designs and easily check for welding defects. [Means for solving the problem]

[0008] In order to achieve the above object, the mask of the present invention comprises: A mask body that covers the wearer's mouth and nose, the mask body has a first portion constituting one of the left and right portions of the mask body, and a second portion constituting the other portion, The first portion and the second portion are welded together at a boundary between the first portion and the second portion with their back surfaces facing each other, At least the surface of the first portion has a first color, the second portion has at least a surface color of a second color different from the first color; The welded portion where the first portion and the second portion are welded is formed so that when viewed from the surface side of the first portion, the second color of the second portion appears and appears to be a color different from the first color. [Effects of the Invention]

[0009] According to the mask of the present invention, the mask body has a first portion constituting one of the left and right portions of the mask body, and a second portion constituting the other portion, and these portions are welded together with their back surfaces facing each other. The surface of the first portion is a first color, and the surface of the second portion is a second color different from the first color. In this case, the combination of the first and second colors can further increase the variety of mask designs.

[0010] Furthermore, when viewed from the surface side of the first part, the welded portion where the first and second parts are welded appears to be a different color from the first color because the second color of the second part is revealed. With this configuration, if a welding defect occurs in a part of the welded portion, the color appearance of the defective welded area will change, for example, the color will appear lighter. Therefore, it is possible to check whether there is a localized change in the color of the welded portion, and if such a change is present, it can be determined that a welding defect has occurred in that area. If such a change is not present (i.e., if the color of the welded portion is uniform), it can be determined that a welding defect has not occurred. This makes it easy to check for welding defects. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 2 is a front view of the mask according to the first embodiment. [Figure 2] Rear view of the mask. [Figure 3] FIG. 3 is a side view of the mask in a folded state, seen from the surface side of the first part. [Figure 4] FIG. 4 is a side view of the mask in a folded state, seen from the surface side of the second part. [Figure 5] 10 is a flowchart showing a procedure for inspecting a mask. [Figure 6] FIG. 10 is a side view showing a defective portion of the mask in a folded state, as viewed from the front side of the first portion. [Figure 7] FIG. 10 is a side view showing a defective portion of the mask in a folded state, as viewed from the surface side of the second part. [Figure 8] FIG. 10 is a front view of a mask according to a second embodiment. [Figure 9] Rear view of the mask. [Figure 10] FIG. 3 is a side view of the mask in a folded state, seen from the surface side of the first part. [Figure 11] Cross-sectional view of line AA in Figure 8. [Figure 12] 10 is a flowchart showing a procedure for inspecting a mask. [Figure 13] FIG. 10 is a side view showing a defective portion of the mask in a folded state, as viewed from the front side of the first portion. [Figure 14] FIG. 10 is a side view showing a defective portion of the mask in a folded state, as viewed from the surface side of the second part. DETAILED DESCRIPTION OF THE INVENTION

[0012] [First embodiment] A mask according to an embodiment of the present invention will now be described with reference to the drawings.

[0013] As shown in Figures 1 and 2, the mask 10 comprises a mask body 11 that covers the wearer's mouth and nose, and a pair of left and right ear loops 12, 13 that are hung around the wearer's ears. The ear loops 12, 13 are provided on both left and right ends of the mask body 11. Of the ear loops 12, 13, the ear loop 12 is hung around the left ear, and the ear loop 13 is hung around the right ear. The mask body 11 corresponds to the "mask body."

[0014] The mask 10 is a urethane mask made of urethane. The mask 10 includes a pair of left and right sheet bodies 15, 16, which are joined by welding. Each of the sheet bodies 15, 16 is made of a sheet-like polyurethane foam (urethane sheet), and more specifically, is formed by punching out a polyurethane foam molded into a sheet. Each of the sheet bodies 15, 16 has a symmetrical shape.

[0015] Each of the sheet bodies 15, 16 includes a first sheet body 15 provided on the left side and a second sheet body 16 provided on the right side. The first sheet body 15 forms the left side of the mask 10, more specifically, the left half of the mask 10. The first sheet body 15 is formed including a first portion 18 that forms the left side (more specifically, the left half) of the mask main body 11, and a left ear hook 12. A hole 21 is formed in the first sheet body 15 to the left of the first portion 18, and the ear hook 12 is formed by a ring-shaped portion that surrounds the hole 21.

[0016] The second sheet body 16 constitutes the right side of the mask 10, more specifically the right half of the mask 10. The second sheet body 16 is formed to include a second portion 19 that constitutes the right side (more specifically the right half) of the mask main body 11, and a right ear loop 13. A hole 22 is formed in the second sheet body 16 to the right of the second portion 19, and the ear loop 13 is formed by a ring-shaped portion that surrounds the hole 22.

[0017] The first portion 18 of the first sheet body 15 and the second portion 19 of the second sheet body 16 are welded together at their boundary with their back surfaces facing each other. As a result, a welded portion 23 where the first portion 18 and the second portion 19 are welded together protrudes toward the front surface of the mask 10 (mask main body 11). The welded portion 23 extends in the vertical direction of the mask main body 11, and more specifically, extends continuously across the entire vertical area of ​​the mask main body 11. The welded portion 23 is welded by, for example, thermal welding. However, the welded portion 23 may also be welded by ultrasonic welding.

[0018] 3 and 4, the mask body 11 can be folded along the welded portion 23 so that the first portion 18 and the second portion 19 overlap with their back surfaces facing each other. Furthermore, the mask 10 can be folded along the welded portion 23 so that the first sheet body 15 and the second sheet body 16 overlap with their back surfaces facing each other.

[0019] In the mask 10 of this embodiment, the first sheet body 15 and the second sheet body 16 are each colored. This point will be described below.

[0020] 1 and 2, the first sheet body 15 is colored a first color C1. In this embodiment, the first color C1 is light blue. More specifically, the entire first sheet body 15 is colored the first color C1. As a result, the front and back surfaces of the entire first sheet body 15, including the first portions 18 and the ear hook portions 12, are both colored the first color C1.

[0021] The second sheet body 16 is colored a second color C2. The second color C2 is a color different from the first color C1, and in this embodiment, is pink. More specifically, the entire second sheet body 16 is colored the second color C2. As a result, the front and back surfaces of the entire second sheet body 16, including the second portions 19 and the ear hook portions 13, are both colored the second color C2.

[0022] 1 to 4, for the sake of convenience, in order to make it easier to understand the difference between the first color C1 and the second color C2, the first color C1 is shown in white and the second color C2 is shown with dot hatching. This also applies to Figures 6 and 7, which will be described later.

[0023] 3, when viewed from the front surface side of the first portion 18, the welded portion 23 where the first portion 18 of the first sheet body 15 and the second portion 19 of the second sheet body 16 are welded appears to be a color different from the first color C1 because a second color C2, which is the color of the second portion 19, appears. More specifically, when viewed from the front surface side of the first portion 18, the welded portion 23 appears to be a color tinged with the hue of the second color C2, due to the combination of the first color C1 of the first portion 18 and the second color C2 of the second portion 19. In this case, it can be said that the welded portion 23 is formed so that when viewed from the front surface side of the first portion 18, the second color C2 of the second portion 19 appears to be a color different from the first color C1.

[0024] 4, when viewed from the surface side of the second portion 19, the welded portion 23 appears to be a color different from the second color C2 because the first color C1, which is the color of the first portion 18, is revealed. More specifically, when viewed from the surface side of the second portion 19, the welded portion 23 appears to be a color that takes on the hue of the first color C1, due to the combination of the second color C2 of the second portion 19 and the first color C1 of the first portion 18. In this case, it can be said that the welded portion 23 is formed so that when viewed from the surface side of the second portion 19, the welded portion 23 appears to be a color different from the second color C2 because the first color C1 of the first portion 18 is revealed.

[0025] Next, a method for inspecting the mask 10 after manufacturing the above-described mask 10 will be described with reference to Figures 5 to 7. Note that the inspection of the mask 10 is performed in a state where the mask body 11 is folded along the welded portion 23 (the state shown in Figures 3 and 4).

[0026] As shown in FIG. 5, first, a welding defect confirmation step (step S1) is performed to confirm whether or not there is a welding defect in the welded portion 23 of the mask 10. In this step, the welded portion 23 is viewed from the surface side of the first portion 18 to confirm whether or not there is a location where the color of the welded portion 23 has changed locally. If the confirmation result shows that there is a location K1 where the color of the welded portion 23 has changed locally, as shown in FIG. 6, it is determined that there is a welding defect in that location K1. Note that in the example of FIG. 6, the color of the welded portion 23 is locally lighter at that location K1. On the other hand, as shown in FIG. 3, if there is no location where the color of the welded portion 23 has changed locally, that is, if the color of the welded portion 23 is uniform throughout the entire welded portion 23, it is determined that there is no welding defect. Note that the welding defect confirmation step corresponds to the "first step."

[0027] Instead of the above-described welding defect confirmation step (hereinafter referred to as the "first welding defect confirmation step"), a second welding defect confirmation step may be performed. In the second welding defect confirmation step, the welded portion 23 is viewed from the surface side of the second portion 19 to confirm whether or not there is a location where the color of the welded portion 23 has changed locally. If the confirmation result shows that there is a location K2 where the color of the welded portion 23 has changed locally, as shown in FIG. 7, it is determined that there is a welding defect at that location K2. Furthermore, if there is no location where the color of the welded portion 23 has changed locally, as shown in FIG. 4, it is determined that there is no welding defect.

[0028] The first welding defect checking step and the second welding defect checking step may be performed separately, in which case the presence or absence of welding defect can be checked with higher accuracy.

[0029] Next, a first hole confirmation step (step S2) is performed to confirm whether or not holes such as pinholes have occurred in the first portion 18 of the mask body 11. In this step, the first portion 18 is viewed from the front side to confirm whether or not there is a portion that appears to be the second color C2, which is the color of the second portion 19 (i.e., a portion that appears to be a color different from the first color C1). If the confirmation result shows that a portion K3 that appears to be the second color C2 is present, as shown in FIG. 6, it is determined that a hole 25 has occurred in the portion K3. On the other hand, if there is no portion that appears to be the second color C2, as shown in FIG. 3, it is determined that no hole has occurred in the first portion 18. The first hole confirmation step corresponds to the "second step."

[0030] Next, a second hole confirmation step (step S3) is performed to confirm whether or not holes such as pinholes have occurred in the second portion 19 of the mask body 11. In this step, the second portion 19 is viewed from the front side to confirm whether or not there are any areas that appear to be the first color C1, which is the color of the first portion 18 (i.e., areas that appear to be a color different from the second color C2). If the confirmation result shows that there is a location K4 where the first color C1 is visible, as shown in FIG. 7, it is determined that there is a hole 26 in that location K4. On the other hand, if there is no location where the first color C1 is visible, as shown in FIG. 4, it is determined that there is no hole in the second portion 19. The second hole confirmation step corresponds to the "third step."

[0031] If, as a result of performing each of the above steps, there is a welding defect in the welded portion 23 of the mask 10, or if there is a hole in either the first portion 18 or the second portion 19, the mask 10 is determined to be defective. On the other hand, if there is no welding defect in the welded portion 23 of the mask 10, and there is no hole in either the first portion 18 or the second portion 19, the mask 10 is determined to be normal. This completes the inspection of the mask 10.

[0032] It should be noted that the above-mentioned steps do not necessarily have to be performed in the order of welding defect confirmation step (S1) → first hole confirmation step (S2) → second hole confirmation step (S3). For example, the welding defect confirmation step may be performed after each hole confirmation step.

[0033] According to the configuration of this embodiment described above in detail, the following excellent effects can be obtained.

[0034] The mask body 11 has a first portion 18 that forms the left side of the mask body 11 and a second portion 19 that forms the right side of the mask body 11, and these portions 18, 19 are welded together at their boundary with their back surfaces facing each other. The surface color of the first portion 18 is a first color C1, and the surface color of the second portion 19 is a second color C2 that is different from the first color C1. In this case, the combination of the first color C1 and the second color C2 can further increase the variety of mask designs.

[0035] Furthermore, when viewed from the surface side of the first portion 18, the welded portion 23 where the first portion 18 and the second portion 19 are welded appears as a second color C2, which is the color of the second portion 19, and thus appears different from the first color C1. With this configuration, if a welding defect occurs in a part of the welded portion 23, the color of the defective welding portion will change, for example, the color of the defective welding portion will appear lighter. Therefore, it is possible to check whether there is a localized change in the color of the welded portion 23, and if such a portion is present, it can be determined that a welding defect has occurred in that portion. If such a portion is not present (i.e., if the color of the welded portion 23 is uniform), it can be determined that a welding defect has not occurred. This makes it easy to check for welding defects.

[0036] When viewed from the surface side of the second portion 19, the welded portion 23 appears as a first color C1, which is the color of the first portion 18, and is therefore a different color from the second color C2. This makes it possible to check for defective welding by viewing the welded portion 23 from the surface side of the second portion 19 and checking for localized changes in the color of the welded portion 23. Therefore, in this case, defective welding can be confirmed whether the welded portion 23 is viewed from the surface side of the first portion 18 or the surface side of the second portion 19. This makes it easier to check for defective welding.

[0037] The color of the back surface of the first portion 18 is a color (specifically, a first color C1) that is different from the second color C2, which is the color of the front surface of the second portion 19. With this configuration, if a hole such as a pinhole occurs in the second portion 19, when the mask body 11 is folded so that the first portion 18 and the second portion 19 overlap and the second portion 19 is viewed from the front side, the color of the back surface of the first portion 18 (first color C1), i.e., a color different from the color of the front surface of the second portion 19, will be visible through the hole. This makes it easy to confirm that a hole has occurred in the second portion 19.

[0038] Furthermore, the color of the back surface of the second portion 19 is a color (specifically, a second color C2) different from the first color C1, which is the color of the front surface of the first portion 18. As a result, if a hole occurs in the first portion 18, when the first portion 18 is viewed from the front surface side, the color of the back surface of the second portion 19 (second color C2), i.e., a color different from the color of the front surface of the first portion 18, will be visible through the hole. Therefore, it is easy to confirm that a hole has occurred in the first portion 18.

[0039] When the mask 10 is manufactured using a manufacturing device, for example, the manufacturing device first picks up each of the sheets 15, 16 and stacks them on top of each other, and then welds the stacked sheets 15, 16 together. When the mask 10 is manufactured in this manner, there is a possibility that one of the sheets 15, 16 may not be picked up during the pick-up process. In this case, the welding process will be performed only on the other sheet, resulting in the production of a mask made of only that other sheet.

[0040] In this regard, according to the mask 10 of the first embodiment, when inspecting the mask 10, the appearance of the mask 10 is checked to see whether the mask 10 has two colors (first color C1 and second color C2) or one color. If the result of the check shows that the mask 10 has one color, it can be determined that a mask made only of the other sheet body has been manufactured. In other words, in this case, it can be determined that the mask was manufactured with one sheet body missing. Therefore, it is possible to easily determine the missing sheet body defect.

[0041] [Second embodiment] Next, a second embodiment will be described. In this embodiment, the mask 30 is a nonwoven fabric mask made of nonwoven fabric.

[0042] 8 and 9, the mask 30 comprises a mask body 31 that covers the wearer's mouth and nose, and a pair of ear loops 32, 33 that are hung on the wearer's ears. Each ear loop 32, 33 is made of an elastic cord and is attached to both ends of the mask body 31 in the left-right direction.

[0043] As shown in FIG. 11, the mask body 31 is formed with a plurality of (specifically, three) nonwoven fabric sheets 35-37. Each of the nonwoven fabric sheets 35-37 includes an outer sheet 35 that forms the front surface of the mask body 31, an inner sheet 36 that forms the back surface of the mask body 31, and an intermediate sheet 37 that is sandwiched between the outer sheet 35 and the inner sheet 36 and forms a filter layer. The nonwoven fabric sheets 35-37 are integrated by welding at their peripheral edges. In this case, the mask body 31 is provided with a plurality of peripheral welds 39 that weld the nonwoven fabric sheets 35-37 along its peripheral edge. Each peripheral weld 39 is, for example, spot welded. The peripheral welds 39 correspond to "sheet welds."

[0044] The mask body 31 has a first portion 41 that constitutes the left portion (more specifically, the left half) of the mask body 31, and a second portion 42 that constitutes the right portion (more specifically, the right half) of the mask body 31. The first portion 41 and the second portion 42 are welded together at their boundary with their back surfaces facing each other. As a result, a welded portion 43 where the first portion 41 and the second portion 42 are welded together protrudes toward the front surface of the mask body 31. The welded portion 43 extends in the vertical direction of the mask body 31, more specifically, extends continuously across the entire vertical area of ​​the mask body 31. As shown in FIG. 10 , the mask body 31 can be folded along the welded portion 43 so that the first portion 41 and the second portion 42 overlap with their back surfaces facing each other.

[0045] In the welded portion 43, the nonwoven fabric sheets 35-37 of the first portion 41 and the nonwoven fabric sheets 35-37 of the second portion 42 are overlapped to form six layers, and the first portion 41 and the second portion 42 are welded together in this six-layered state (see FIG. 11). The welded portion 43 is welded by, for example, thermal welding. However, the welded portion 43 may also be welded by ultrasonic welding.

[0046] The peripheral welds 39 include a plurality of first welds 39a provided in the first portion 41 and a plurality of second welds 39b provided in the second portion 42. The first welds 39a and the second welds 39b are arranged symmetrically with respect to the welded portion 43. Therefore, when the mask body 31 is folded along the welded portion 43 (the state shown in FIG. 10), the first welds 39a and the second welds 39b overlap each other. The first welds 39a correspond to the "first sheet welds," and the second welds 39b correspond to the "second sheet welds."

[0047] Here, the mask 30 of this embodiment has a colored mask body 31. This point will be described below.

[0048] Of the nonwoven fabric sheets 35 to 37 that make up the mask body 31, the outer sheet 35 has a first sheet portion 35a that is the left portion of the outer sheet 35 and a second sheet portion 35b that is the right portion of the outer sheet 35. The first sheet portion 35a is the portion of the outer sheet 35 that makes up the first portion 41 of the mask body 31. The second sheet portion 35b is the portion of the outer sheet 35 that makes up the second portion 42 of the mask body 31.

[0049] The first sheet portion 35a is colored a first color D1. In this embodiment, the first color D1 is beige. More specifically, the entire first sheet portion 35a is colored the first color D1. As a result, the surface of the first portion 41 is colored the first color D1.

[0050] The second sheet portion 35b is colored a second color D2. The second color D2 is a color different from the first color D1. In this embodiment, the second color D2 is gray. More specifically, the entire second sheet portion 35b is colored the second color D2. As a result, the surface of the second portion 42 is colored the second color D2.

[0051] 8 to 10, for the sake of convenience, in order to make it easier to understand the difference between the first color D1 and the second color D2, the first color D1 is shown with light dot hatching and the second color D2 is shown with dark dot hatching. This also applies to Figures 13 and 14, which will be described later.

[0052] The inner sheet 36 and the intermediate sheet 37 are not colored and are entirely white. The inner sheet 36 may be entirely colored in a light beige color or the like.

[0053] 10 , when viewed from the surface side of the first portion 41, the welded portion 43 of the mask body 31 appears to be a color different from the first color D1 because a second color D2, which is the surface color of the second portion 42, is revealed. More specifically, when viewed from the surface side of the first portion 41, the welded portion 43 appears to be a color tinged with the hue of the second color D2, due to the combination of the first color D1, which is the surface color of the first portion 41, and the second color D2 of the second portion 42. In this case, it can be said that the welded portion 43 is formed so that when viewed from the surface side of the first portion 41, the second color D2 of the second portion 42 is revealed and the welded portion 43 appears to be a color different from the first color D1.

[0054] When viewed from the surface side of the second portion 42, the welded portion 43 does not show the first color D1, which is the color of the surface of the first portion 41, and as a result, it appears to show the second color D2, which is the color of the surface of the second portion 42 (see Figure 14).

[0055] 9, each first welded portion 39a of the mask body 31 is formed so that when viewed from the back side of the first portion 41, the first color D1 of the first sheet portion 35a is revealed, making it appear to be a color different from the second color D2. Also, each second welded portion 39b of the mask body 31 is formed so that when viewed from the back side of the second portion 42, the second color D2 of the second sheet portion 35b is revealed, making it appear to be a color different from the first color D1.

[0056] Next, a description will be given of a method for inspecting the above-mentioned mask 30. Note that the inspection of the mask 30 is carried out in a state where the mask body 31 is folded along the welded portion 43 (the state shown in FIG. 10).

[0057] As shown in FIG. 12, first, a welding defect confirmation step (step S11) is performed to confirm whether or not there is a welding defect in the welded portion 43 of the mask body 31. In this step, the welded portion 43 is viewed from the surface side of the first portion 41 to confirm whether or not there is a location where the color of the welded portion 43 has changed locally. If the confirmation result indicates that there is a location K5 where the color of the welded portion 43 has changed locally, as shown in FIG. 13, it is determined that there is a welding defect in that location K5. Note that in the example of FIG. 13, the color of the welded portion 43 is locally lighter at the location K5. On the other hand, as shown in FIG. 10, if there is no location where the color of the welded portion 43 has changed locally, that is, if the color of the welded portion 43 is uniform throughout the entire welded portion 43, it is determined that there is no welding defect. Note that the welding defect confirmation step corresponds to the "first step."

[0058] Next, a third hole checking step (step S12) is performed to check whether or not holes such as pinholes have occurred in each of the first welded portions 39a. As described above, when the mask body 31 is folded, the first welded portions 39a overlap with the second welded portions 39b. Therefore, if holes have occurred in the first welded portions 39a, the color of the second welded portions 39b will be visible through the holes. Furthermore, since the color of the second welded portions 39b is different from the first color D1, which is the color of the surface of the first portion 41, a color different from the first color D1 will be visible through the holes.

[0059] Therefore, in the third hole confirmation step, the first welded portion 39a is viewed from the surface side of the first portion 41 to check whether it appears to be a color different from the first color D1. If the check results in a color different from the first color D1, as shown in FIG. 13, it is determined that a hole 45 has occurred in the first welded portion 39a. On the other hand, if it appears to be the first color D1, it is determined that no hole has occurred in the first welded portion 39a. The third hole confirmation step corresponds to the "fourth step."

[0060] Next, a fourth hole checking process (step S13) is performed to check whether or not holes such as pinholes have occurred in each second welded portion 39b. In this process, the second welded portion 39b is viewed from the surface side of the second portion 42 to check whether or not it appears to be a color different from the second color D2. If the result of the check is that it appears to be a color different from the second color D2, as shown in FIG. 14, it is determined that a hole 46 has occurred in the second welded portion 39b. On the other hand, if it appears to be the second color D2, it is determined that no hole has occurred in the second welded portion 39b. The fourth hole checking process corresponds to the "fifth process."

[0061] If, as a result of performing each of the above steps, there is a welding defect in the welded portion 43 of the mask 30, or if there is a hole in either of the welded portions 39a, 39b, the mask 30 is determined to be defective. On the other hand, if there is no welding defect in the welded portion 43 of the mask 30, and there is no hole in either of the welded portions 39a, 39b, the mask 30 is determined to be normal. This completes the inspection of the mask 30.

[0062] It should be noted that the above-mentioned steps do not necessarily have to be performed in the order of welding defect confirmation step (S11) → third hole confirmation step (S12) → fourth hole confirmation step (S13). For example, the welding defect confirmation step may be performed after each hole confirmation step.

[0063] According to the configuration of this embodiment described above in detail, the following excellent effects can be obtained.

[0064] In the mask body 31, the surface color of the first portion 41 is a first color D1, and the surface color of the second portion 42 is a second color D2 that is different from the first color D1. In this case, the combination of the first color D1 and the second color D2 can further increase the variety of mask designs.

[0065] Furthermore, when viewed from the surface side of the first portion 41, the welded portion 43 where the first portion 41 and the second portion 42 are welded appears as a second color D2, which is the color of the second portion 42, and is therefore a different color from the first color D1. With this configuration, it is possible to check whether there are any areas where the color of the welded portion 43 has changed locally, and if such areas are present, it is determined that there is a welding defect in that area, and if there are no such areas, it is determined that there is no welding defect. This makes it easy to check for welding defects.

[0066] The peripheral welded portion 39 that welds the multiple nonwoven fabric sheets 35-37 together includes a first welded portion 39a provided in the first portion 41 and a second welded portion 39b provided in the second portion 42. When viewed from the back side of the first portion 41, the first welded portion 39a appears to be a color different from the second color D2 because the first color D1 of the first sheet portion 35a of the outer sheet 35 is revealed. When viewed from the back side of the second portion 42, the second welded portion 39b appears to be a color different from the first color D1 because the second color D2 of the second sheet portion 35b of the outer sheet 35 is revealed.

[0067] Furthermore, the first welded portion 39a and the second welded portion 39b are positioned symmetrically with respect to the welded portion 43, which corresponds to the folding line when folding the mask body 31. In this case, when the mask body 31 is folded along the welded portion 43, the first welded portion 39a and the second welded portion 39b overlap each other. With this configuration, if a hole such as a pinhole occurs in the first welded portion 39a, a color different from the first color D1, which is the surface color of the first portion 41, will be visible through the hole. This makes it easy to confirm that a hole has occurred in the first welded portion 39a. Furthermore, if a hole occurs in the second welded portion 39b, a color different from the first color D2, which is the surface color of the second portion 42, will be visible through the hole. This makes it easy to confirm that a hole has occurred in the second welded portion 39b.

[0068] [Other embodiments] The present invention is not limited to the above-described embodiment, and may be implemented, for example, as follows.

[0069] (1) In the first embodiment described above, the color of the first portion 18 (i.e., the first color C1) in the mask body 11 is light blue, and the color of the second portion 19 (i.e., the second color C2) is pink. However, the color combination of the first color C1 and the second color C2 is not necessarily limited to this. For example, a combination of the first color C1 being yellow and the second color C2 being yellow-green is conceivable. Alternatively, the first color C1 may be white and the second color C2 may be pink. In short, the combination of the first color C1 and the second color C2 may be any as long as the welded portion 23 is formed so that, when viewed from the surface side of the first portion 18, the second color C2 of the second portion 19 is revealed, making it appear a color different from the first color C1.

[0070] Furthermore, in the second embodiment, the color of the first portion 41 (i.e., the first color D1) in the mask body 31 is beige, and the color of the second portion 42 (i.e., the second color D2) is gray. However, the color combination of the first color D1 and the second color D2 in the second embodiment is not necessarily limited to this. For example, a combination in which the first color D1 is blue and the second color D2 is red is also conceivable. In short, in the second embodiment, the combination of the first color D1 and the second color D2 may be any combination as long as the welded portion 43 is formed so that, when viewed from the surface side of the first portion 41, the second color D2 of the second portion 42 is revealed and appears to be a color different from the first color D1.

[0071] (2) In the first embodiment, the color of the first portion 18 (i.e., the first color C1) may be a light color, and the color of the second portion 19 (i.e., the second color C2) may be a dark color. Examples of light colors include white, beige, yellow, and light blue. Examples of dark colors include black, navy blue, and brown. By combining the first color C1 and the second color C2 as a light and dark color in this manner, when the welded portion 23 is viewed from the surface side of the first portion 18, the second color C2 (dark color) of the second portion 19 is more likely to appear and is more likely to appear as a color different from the first color C1. This makes it easier to check whether or not a welding defect has occurred when viewing the welded portion 23 from the surface side of the first portion 18.

[0072] Similarly, in the second embodiment, the first color D1 on the first portion 41 side may be a light color, and the second color D2 on the second portion 42 side may be a dark color.

[0073] (3) It is also assumed that holes such as pinholes may occur in the first portion 41 or the second portion 42 of the mask body 31 in the mask 30 of the second embodiment. Therefore, in the second embodiment, when inspecting the mask 30, a first hole checking step for checking whether or not a hole has occurred in the first portion 41 and a second hole checking step for checking whether or not a hole has occurred in the second portion 42 may be performed.

[0074] In the first hole confirmation process, when the mask body 31 is in a folded state, the first portion 41 is viewed from the front side to check whether there is a portion that appears white, which is the color of the back surface of the second portion 42 (i.e., a color different from the first color D1, which is the color of the front surface of the first portion 41). If the check reveals that there is a portion that appears white, it is determined that there is a hole in that portion, and if there is no portion that appears white, it is determined that there is no hole in the first portion 41. The first hole confirmation process corresponds to the "second process."

[0075] In the second hole confirmation process, when the mask body 31 is in a folded state, the second portion 42 is viewed from the front side to check whether there is a portion that appears white, which is the color of the back surface of the first portion 41 (i.e., a color different from the second color D2 that is the color of the front surface of the second portion 42). If the check reveals that there is a portion that appears white, it is determined that there is a hole in that portion, and if there is no portion that appears white, it is determined that there is no hole in the second portion 42. The second hole confirmation process corresponds to the "third process."

[0076] (4) In the first embodiment, the sheet body 15 colored in the first color C1 is arranged on the left side, and the sheet body 16 colored in the second color C2 is arranged on the right side. However, this may be reversed, with the sheet body colored in the first color C1 on the right side and the sheet body colored in the second color C2 on the left side. In this case, the sheet body on the right side corresponds to the "first sheet body," and the sheet body on the left side corresponds to the "second sheet body." Furthermore, the portion of the sheet body on the right side that constitutes the right side of the mask body corresponds to the "first portion," and the portion of the sheet body on the left side that constitutes the left side of the mask body corresponds to the "second portion."

[0077] Similarly, in the second embodiment, the colors of the left and right portions of the mask body 31 may be reversed. That is, the surface color of the left portion of the mask body 31 may be the second color D2, and the surface color of the right portion may be the first color D1. In this case, the right portion of the mask body 31 corresponds to the "first portion," and the left portion corresponds to the "second portion."

[0078] (5) In the first embodiment, a thickness defect confirmation step (corresponding to step 6) may be performed during the inspection of the mask 10. In the thickness defect confirmation step, the mask 10 is folded along the welded portion 23 so that the first sheet body 15 and the second sheet body 16 overlap each other. Then, the mask 10 is viewed from a direction intersecting the overlapping direction of the sheets 15 and 16 to confirm the thickness difference between the sheets 15 and 16. Based on the confirmation results, it is determined whether or not the sheets 15 and 16 have a thickness defect. In this case, since the sheets 15 and 16 have different colors, it is easy to confirm the thickness difference between the sheets 15 and 16. Therefore, it is easy to determine whether or not the sheets 15 and 16 have a thickness defect. For example, if the thickness of one of the sheets 15 and 16 is smaller than a predetermined thickness, the thickness defect can be easily identified.

[0079] When manufacturing the first sheet body 15, for example, a block of urethane colored in the first color C1 may be sliced ​​to a predetermined thickness. The same process is used when manufacturing the second sheet body 16. When manufacturing the sheet bodies 15, 16 using this type of slicing process, defects such as the sheet bodies 15, 16 being sliced ​​thinner than the predetermined thickness may occur. Therefore, when the sheet bodies 15, 16 are manufactured in this manner, it is particularly effective to perform a thickness defect confirmation process. [Explanation of symbols]

[0080] 10...mask, 11...mask main body, 12, 13...ear loops, 15...first sheet body, 16...second sheet body, 18...first part, 19...second part, 23...welded part, 30...mask, 31...mask main body, 35...outer sheet, 35a...first sheet part, 35b...second sheet part, 39...peripheral welded part as sheet welded part, 39a...first welded part as first sheet welded part, 39b...second welded part as second sheet welded part, 41...first part, 42...second part, 43...welded part.

Claims

1. A mask body that covers the wearer's mouth and nose, the mask body has a first portion constituting one of the left and right portions of the mask body, and a second portion constituting the other portion, the first portion and the second portion are welded together at a boundary between the first portion and the second portion with their back surfaces facing each other, At least a surface of the first portion has a first color, At least a surface color of the second portion is a second color different from the first color, A mask in which the welded portion where the first portion and the second portion are welded is formed so that when viewed from the surface side of the first portion, the second color of the second portion appears and appears to be a color different from the first color.

2. The mask body is foldable along the welded portion so that the first portion and the second portion overlap with each other with their back surfaces facing each other, a color of the back surface of the first portion is different from the second color; The mask of claim 1 , wherein a color of the back surface of the second portion is different from the first color.

3. A urethane mask comprising a pair of urethane sheet bodies, the pair of sheet bodies being joined by welding, The pair of sheet bodies a first sheet body formed to include the first portion and an ear hook portion to be hooked over one ear of a wearer; a second sheet body formed to include the second portion and an ear hook portion to be hooked over the other ear of the wearer, the first portion of the first sheet body and the second portion of the second sheet body are welded to form the welded portion, the first sheet body is colored in the first color, The mask according to claim 1 or 2, wherein the second sheet body is colored in the second color.

4. The mask body is formed by joining a plurality of nonwoven fabric sheets by welding, The plurality of nonwoven fabric sheets includes an outer sheet that forms the surface of the mask body, a first sheet portion of the outer sheet that constitutes the first portion has a surface color of the first color; a second sheet portion of the outer sheet that constitutes the second portion has a surface color of the second color; The mask body is foldable along the welded portion so that the first portion and the second portion overlap with each other with their back surfaces facing each other, the sheet welding portions for welding the plurality of nonwoven fabric sheets include a first sheet welding portion provided in the first portion and a second sheet welding portion provided in the second portion; the first sheet welded portion is formed so that the first color of the first sheet portion appears when viewed from the back surface side of the first portion, and thus appears to be a color different from the second color; the second sheet welded portion is formed so that the second color of the second sheet portion appears as a color different from the first color when viewed from the back surface side of the second portion, The mask according to claim 1 or 2, wherein the first sheet welded portion and the second sheet welded portion are disposed symmetrically with respect to the welded portion.

5. 3. The mask according to claim 1, wherein the welded portion is formed so that, when viewed from the surface side of the second portion, the first color of the first portion is revealed, thereby appearing to be a color different from the second color.

6. the first color is a light color; The mask of claim 1 or 2, wherein the second color is a dark color.

7. 2. The mask inspection method according to claim 1, A mask inspection method comprising a first step of observing the welded portion from the surface side of the first portion, checking whether there is a location where the color of the welded portion has changed locally, and determining, if there is a location, that there is a welding defect in that location.

8. 3. The mask inspection method according to claim 2, further comprising: a second step of viewing the first portion from the front side while the mask body is folded along the welded portion, and checking whether or not there is a portion that appears to be a color different from the first color, and determining that a hole has occurred in that portion if there is a portion; and a third step of viewing the second portion from the front side of the mask body in the folded state, and checking whether or not there is a portion that appears to be a color different from the second color, and determining that a hole has occurred in that portion if there is a portion that appears to be a color different from the second color; A method for inspecting a mask, comprising:

9. 5. The mask inspection method according to claim 4, further comprising: a fourth step of viewing the first sheet welded portion from the surface side of the first portion while the mask body is folded along the welded portion, and checking whether the first sheet welded portion appears to be a color different from the first color, and determining that a hole has occurred in the first sheet welded portion if the color appears to be a different color; a fifth step of viewing the second sheet welded portion from the surface side of the second portion while the mask body is in the folded state, and checking whether the second sheet welded portion appears to be a color different from the second color, and determining that a hole has occurred in the second sheet welded portion if the color appears to be a different color; A method for inspecting a mask, comprising:

10. 4. The mask inspection method according to claim 3, a sixth step of folding the mask along the welded portion so that the first sheet body and the second sheet body overlap, viewing the mask from a direction intersecting the overlapping direction, checking the difference in thickness of each of the sheet bodies, and determining whether or not a thickness defect has occurred in each of the sheet bodies based on the checking results.

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