face mask

Abstract

A face mask includes: a face mask body that covers at least a portion of a wearer's face; and a cooling body disposed on the face mask body, wherein the face mask body is configured to form an internal space between itself and the wearer's face when worn, the cooling body comprising: a water-retaining layer, a first sheet, and a second sheet disposed opposite to the first sheet through the water-retaining layer, and disposed on the face mask body such that at least a portion of it is in direct or indirect contact with the wearer's face when worn, wherein at least one of the first sheet and the second sheet is made of a non-breathable sheet or a non-breathable sheet.

Description

TECHNICAL FIELD

[0001] The present application relates to a mask and a cooling sheet for a mask. BACKGROUND

[0002] Conventionally, a mask that covers the mouth and nose of a wearer has been used in order to prevent inhalation of dust, pollen, viruses, and the like in the outside air, or to prevent scattering of saliva and the like. In recent years, the functions of such masks that cover the mouth and nose have diversified, and various masks have been developed.

[0003] For example, Japanese Patent Application Publication No. 2006-102145 discloses a mask configured such that, by providing a reinforcing body at the upper edge of a mask body or in the vicinity thereof, a gap is less likely to be formed between the upper edge of the mask body and the face, and by causing the reinforcing body to have a heating function, the part of the nasal cavity on both sides of the nose is warmed, and a comfortable feeling is brought to a wearer who has allergic rhinitis or a cold.

[0004] In addition, Japanese Patent Application Publication No. 2014-140774 discloses a mask provided with a mask body configured to form a space between the mouth and the nose when worn on the face, and an absorbent core body disposed in the mask body in opposition to the space, and configured to prevent dryness of the throat by using moisture evaporated from the absorbent core body. In particular, the mask of Japanese Patent Application Publication No. 2014-140774 is characterized in that, by disposing the absorbent core body in a manner such that the absorbent core body does not contact the mouth and the nose, the mask can be comfortably worn even at noon. SUMMARY

[0005] The present application relates to a mask provided with a mask body that covers at least a part of the face of a wearer, and a cooling body provided to the mask body, and configured to form an internal space between the mask body and the face of the wearer when worn, the cooling body being provided with a water-retaining layer that retains water, a first sheet, and a second sheet disposed in opposition to the first sheet with the water-retaining layer interposed therebetween, and disposed to the mask body in a manner such that at least a part thereof directly or indirectly contacts the face of the wearer when worn, at least one of the first sheet and the second sheet being composed of a non-breathable sheet or a less-breathable sheet.

[0006] In addition, the present application relates to a cooling sheet for a mask used together with a mask body that covers at least a part of the face of a wearer, and provided with a water-retaining layer that retains water, the cooling sheet being configured such that, in a state in which the cooling sheet is disposed between the mask body and the wearer, at least a part of the water-retaining layer directly or indirectly contacts the face of the wearer. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 is a view showing a mask of one embodiment of the present application.

[0008] Figure 2 is an expanded view showing an expanded state of a mask body in the mask of the first embodiment.

[0009] Figure 3 is a cross-sectional view along the line I-I' of Figure 2

[0010] Figure 4 is a view showing a folded state of the mask of the first embodiment.

[0011] Figure 5 (a) is a side view showing a state where the mask of the first embodiment is worn on a volumetric-determination head model, Figure 5 (b) is a front view showing a state where the mask of the first embodiment is worn on a volumetric-determination head model.

[0012] Figure 6 (a) is a view showing a state after an end portion of a skin side of the mask is opened, Figure 6 (b) is a view showing a state after the holding portion is folded in.

[0013] Figure 7 is a view schematically showing a cross section of a cooling body.

[0014] Figure 8 is a view showing a state after the mask is enclosed in a packaging bag.

[0015] Figure 9 (a) is a view showing a state when the holding portion is stretched, Figure 9 (b) is a view showing a state when the holding portion is worn.

[0016] Figure 10 is a view showing a mask of a modification example of the first embodiment.

[0017] Figure 11 is a schematic view showing a device for measuring a water vapor production amount.

[0018] Figure 12 is a view showing a mask of the second embodiment.

[0019] Figure 13 is a view showing a cooling sheet for a mask.

[0020] Figure 14 is a cross-sectional view along the line II-II' of Figure 13

[0021] Figure 15 is a view showing a state after the cooling sheet for a mask is enclosed in a packaging bag.​​

[0022] Figure 16 This diagram shows a mask body equipped with a cooling sheet for the mask.

[0023] Figure 17 This diagram shows the state of the wearer wearing the mask of the second embodiment.

[0024] Symbol Explanation

[0025] 1, 1': Cooling face mask

[0026] 2, 2': Main body of the mask

[0027] 4: Interior space

[0028] 4a: Upper joint

[0029] 4b: Lower joint

[0030] 5: End of the veneer side

[0031] 6: End of occlusion

[0032] 7: Upper edge

[0033] 8: Lower edge

[0034] 10A: First piece of body

[0035] 10B: Second body piece

[0036] 10': Main body

[0037] 14, 14': Inner surface sheet

[0038] 16, 16': Outer surface sheet

[0039] 20, 20': cooling body

[0040] 22: Substrate layer

[0041] 24: Water-retaining layer

[0042] 26: First Sheet

[0043] 28: Second sheet

[0044] 30, 30': Holding part (ear loop)

[0045] 31: Main body of the ear loop

[0046] 32: Ear loop hole

[0047] 39: Sealing part

[0048] 50: Cooling sheet for face mask

[0049] 100: Vertical centerline

[0050] 200, 200': Packaging bags Detailed Implementation

[0051] In recent years, due to the global pandemic of COVID-19, the daily wearing of face masks has been required even in summer. However, with existing face masks, there is a possibility of feeling stuffy and hot when worn in summer because the mask is in direct contact with the skin, and there is also a possibility of increased humidity inside the mask due to the vapor contained in exhaled breath, which can also cause a feeling of damp heat. In particular, the face mask disclosed in Japanese Patent Application Publication No. 2006-102145 has a more pronounced stuffiness and heat due to the direct contact with the skin, and the face mask disclosed in Japanese Patent Application Publication No. 2014-140774 has a more pronounced damp heat due to the increased humidity inside the mask.

[0052] Therefore, the present invention relates to a face mask and a cooling sheet for the face mask that can provide a cooling sensation to the wearer.

[0053] That is, the present invention relates to a face mask comprising: a face mask body covering at least a portion of the wearer's face; and a cooling body disposed on the face mask body, wherein the face mask body is configured to form an internal space between itself and the wearer's face when worn, the cooling body comprising: a water-retaining layer, a first sheet, and a second sheet disposed opposite to the first sheet through the water-retaining layer, and disposed on the face mask body such that at least a portion therein directly or indirectly contacts the wearer's face when worn, wherein at least one of the first sheet and the second sheet is made of a non-breathable sheet or a non-breathable sheet.

[0054] In addition, the present invention relates to a cooling sheet for a face mask, which is used in conjunction with a face mask body covering at least a portion of the wearer's face, and has a water-retaining layer, configured such that, when disposed between the face mask body and the wearer, at least a portion of the water-retaining layer is in direct or indirect contact with the wearer's face.

[0055] The face mask and cooling sheet for face masks according to the present invention can provide a cooling sensation to the wearer.

[0056] Hereinafter, preferred embodiments for carrying out the present invention will be described using the accompanying drawings. Furthermore, the following embodiments do not limit the invention as claimed, and not all feature combinations described in the embodiments are necessary for the solution of the invention. Additionally, the accompanying drawings are schematic diagrams appropriately emphasized, omitted, and scaled for the purpose of illustrating the present invention, and may sometimes differ from the actual shapes, positional relationships, or proportions.

[0057] [First Implementation]

[0058] First, use Figures 1-9 The mask 1 of the first embodiment of the present invention will be described below.

[0059] [The overall structure of the face mask]

[0060] like Figure 1 As shown, the face mask 1 of this embodiment is a so-called cooling face mask (hereinafter referred to as "cooling face mask 1"), comprising: a face mask body 2, which can cover at least a portion of the wearer (mouth and nose in this embodiment); and one or more cooling elements 20 disposed on the face mask body 2. In addition, the cooling face mask 1 of this embodiment further comprises one or more holding parts 30 for holding the face mask body 2 in front of the wearer's face.

[0061] Furthermore, in this specification, the open side (the side that contacts the face) of the mask body 2 is referred to as the "face-contacting end 5," and the closed side (bottom side) located opposite the face-contacting end 5 is referred to as the "closed side end 6." Additionally, the mask body 2, arranged with the "face-contacting end 5" and the "closed side end 6" in a left-right orientation, is viewed from a planar perspective (i.e., Figure 4 In the state of (the mask body 2 covering the wearer's mouth and nose), the upper edge is referred to as "upper edge 7", and the lower edge in this state is referred to as "lower edge 8". Here, "upper edge 7" is the edge located on the nasal side when the mask body 2 covers the wearer's mouth and nose, and "lower edge 8" is the edge located on the mandibular side in this state.

[0062] Furthermore, in this specification, the shape in which the opening of the face-fitting end 5 is opened and the three-dimensional shape is maintained is referred to as "three-dimensional". Further, in this specification, the term "width direction" refers to the direction from the face-fitting end 5 of the first sheet portion 10A (described later) through the blocking end 6 to the face-fitting end 5 of the second sheet portion 10B (described later), and the term "both ends of the mask body in the width direction" refers to the face-fitting end 5 of the first sheet portion 10A and the face-fitting end 5 of the second sheet portion 10B.

[0063] [The composition of the main body of the mask]

[0064] like Figure 1 As shown, the mask body 2 has a circumferential surface extending from the face-contacting end 5 toward the closed-off end 6, and is configured such that an internal space 4 is formed between the mask body 2 and the wearer's face when worn. That is, the mask body 2 is configured such that when worn, the face-contacting end 5 and its surrounding circumferential surface are in contact with the wearer's face (skin), while other areas of the circumferential surface and the closed-off end 6 are away from the wearer's face (skin), forming an internal space 4 between the mask body 2 and the wearer's face.

[0065] Specifically, the mask body 2 includes: a first piece 10A forming half of the circumferential surface of the mask body 2; and a second piece 10B forming the remaining half of the circumferential surface. For example... Figure 1 As shown, the first sheet portion 10A and the second sheet portion 10B are configured to be deformable into a three-dimensional shape by opening the opening at the end portion 5 on the facing side. Furthermore, when the first sheet portion 10A and the second sheet portion 10B are maintained in a three-dimensional state, as... Figure 1 and Figure 6 As shown in (a), it has a tapering shape that converges from the open, annular, facing end 5 toward the linear, closed end 6. However, it is not limited to this, and it may also be configured such that the closed end 6 has a planar bottom.

[0066] like Figure 1 and Figure 2 As shown, the mask body 2 is unfolded with its inner surface facing upwards, in a three-dimensional manner (i.e., Figure 2 In the state of [unclear], a longitudinal center line 100 extending orthogonally to the width direction is provided at the center of the mask body 2 in the width direction. In the mask body 2 of this embodiment, the first sheet portion 10A is formed on one side of the width direction, with the longitudinal center line 100 as the boundary, and the second sheet portion 10B is formed on the other side of the width direction. In addition, Figure 2 This is a top view of the mask body 2 unfolded with its inner surface facing upwards, in a three-dimensional form. Figure 3 It is along Figure 2 A cross-sectional view of line I-I' in the middle. Figure 4 This diagram shows the state of the mask body 2 folded in half with the longitudinal center line 100 as the center.

[0067] like Figure 2 As shown, the first piece 10A and the second piece 10B are integrally continuous along the longitudinal center line 100 and have a left-right symmetrical shape with the longitudinal center line 100 of the two pieces 10A and 10B as the boundary. In other words, the mask body 2 includes sheet-like members in which the first piece 10A and the second piece 10B of the same shape and size are arranged symmetrically from left to right. Alternatively, the first piece 10A and the second piece 10B may be configured, for example, to mechanically join the separately formed first piece 10A and the second piece 10B, instead of being integrally formed from the beginning.

[0068] The mask body 2 is sheet-like, more specifically, formed from a single sheet of material. This single sheet forming the mask body 2 can be a single-layer structure or a multi-layered structure composed of multiple stacked sheets. The sheet-like component forming the mask body 2 can be configured to perform various functions by assigning different functions to the multiple sheets; therefore, a multi-layered structure is preferred. When using multiple sheets, the sheets can be embossed or laminated, or they can be joined together entirely but separated from each other. Regarding the joining of the sheets when they are separated, the edges of the sheets can be joined along the shape of the mask body 2, or only a portion of the edges can be joined. Furthermore, the following joining methods can be used.

[0069] In the following description of this embodiment, the method by which the mask body 2 is formed from a single sheet of material with a multi-layered structure will be explained. Specifically, as follows... Figure 3 As shown, the mask body 2 includes: an inner surface sheet 14, which forms an inner surface when it is three-dimensional; and an outer surface sheet 16, which forms an outer surface when it is three-dimensional. The inner surface sheet 14 and the outer surface sheet 16 are formed with the same shape and size, and these inner surface sheets 14 and outer surface sheets 16 form a multi-layered structure of a single sheet.

[0070] In the face mask body 2 of this embodiment, a cooling body 20 is disposed between the inner surface sheet 14 and the outer surface sheet 16. That is, when both the inner surface sheet 14 and the outer surface sheet 16 contain a single layer or multiple layers of nonwoven fabric as described below, the cooling body 20 is sandwiched between two or more pieces of nonwoven fabric. However, it is not limited to this. It can be configured such that a pocket-shaped storage portion is provided on the inner surface of the face mask body 2 so as to load and unload the cooling body 20 in the storage portion. It can also be configured such that the cooling body 20 is fixed to the inner surface of the face mask body 2 using a fixing method such as adhesive. In addition, it can be configured such that the outer surface sheet 16 and the inner surface sheet 14 are partially non-adhesive, so that an opening for inserting and unloading the cooling body 20 and a storage space are formed between the outer surface sheet 16 and the inner surface sheet 14.

[0071] An adhesive (not shown) is applied to the outer surface sheet 16, and the cooling body 20 and the inner surface sheet 14 are bonded together by the adhesive. A hot-melt adhesive is preferred as the adhesive, but it is not limited to this; various known fixing methods can be used. For example, adhesives other than hot-melt adhesives, sewing, heat fusion, etc., can be used, as long as they can be used for fixing. Alternatively, the adhesive can be applied to the inner surface sheet 14 instead of the outer surface sheet 16.

[0072] The materials used for the inner surface sheet 14 and the outer surface sheet 16 can be those used in the field of face masks that cover the mouth and nose, and there are no particular restrictions on their types as long as they have a certain degree of breathability. For example, non-woven fabric, woven fabric, paper, and other fiber sheets, resin foam sheets, metal sheets, or combinations thereof can be used. Among these, non-woven fabric is preferred from the viewpoint of ease of processing or economy. As the fiber raw material for non-woven fabric, it is preferred to use raw materials composed of one or more fibers selected from polyesters such as PET (polyethylene terephthalate); polyolefins such as PE (polyethylene), PP (polypropylene), and ethylene propylene copolymer; rayon; cotton, etc. In addition, as the non-woven fabric, non-woven fabrics can be made by using fibers from one or more of the above-mentioned raw materials through hot air method, spunbond method, needle punching method, meltblown method, carding method, hot melt bonding method, water flow weaving method, solvent bonding method, etc., and can be single-layer or multi-layer structure. In addition, as a nonwoven fabric, various treatments such as chemical treatment, mechanical treatment and physicochemical treatment can be used depending on the purpose.

[0073] Furthermore, the inner surface sheet 14 and the outer surface sheet 16 can be either single-layered or multi-layered. They can be a single-layered structure composed of only one sheet, or a multi-layered structure obtained by overlapping two or more sheets. Moreover, when the mask body 2 adopts a multi-layered structure, the material of the mask body 2 positioned on the side opposite to the wearer's side (outer side) can be different from the material of the mask body 2 positioned on the inner side. Specifically, the outer surface sheet 16 positioned on the outer side can be made of a material suitable for providing shape retention to the mask, while the inner surface sheet 14 positioned on the inner side can be made of a material designed to improve skin feel. Additionally, the inner surface sheet 14 and the outer surface sheet 16 can be colored in any color, and any patterns can be added through printing or other means. With this configuration, the texture and design are improved, resulting in a mask that the user will appreciate.

[0074] From the viewpoint of improving the heat transfer efficiency from the wearer's face to the cooling body 20 and facilitating the evaporation of water vapor generated by the cooling body 20, the inner surface sheet 14 is preferably a breathable sheet. Specifically, from the viewpoint of promoting vaporization heat dissipation caused by water evaporation, the breathability of the inner surface sheet 14 is preferably 300 seconds / 100 mL or less, more preferably 200 seconds / 100 mL or less, further preferably 100 seconds / 100 mL or less, even more preferably 5 seconds / 100 mL or less, and most preferably 0 seconds / 100 mL. As long as such breathability is met, the inner surface sheet 14 may also be configured to be partially non-breathable.

[0075] Here, air permeability is a value measured according to JIS (Japanese Industrial Standards) P8117 (2009 revised edition), defined as the passage of 100ml of air through 6.42cm under a certain pressure. 2 The permeability is determined by the time it takes for air to pass through the surface. Therefore, a higher permeability value means that air takes longer to pass through, i.e., lower permeability. Conversely, a lower permeability value means higher permeability. Thus, the value of permeability and the level of permeability show an inverse relationship. Permeability can be measured using a Wang Yan-type permeability meter. In this instruction manual, permeability below 30,000 seconds / 100ml is defined as "permeable", permeability above 30,000 seconds / 100ml but below 80,000 seconds / 100ml is defined as "poorly permeable", and permeability above 80,000 seconds / 100ml is defined as "non-permeable".

[0076] Furthermore, from the viewpoint of balancing the increase in thickness and sheet strength, the weight per square meter of the inner surface sheet 14 is preferably 5 g / m². 2 The above, more preferably 10g / m 2 The above is further preferred to be 15g / m 2 The above is further preferred to be 20g / m 2 That's all. Furthermore, from the viewpoint of improving heat transfer efficiency from the wearer's face to the cooling element 20 and facilitating the evaporation of water vapor generated by the cooling element 20, the weight per square meter of the inner surface sheet 14 is preferably 60 g / m². 2 The following is more preferably 50g / m 2 The following is a further preferred value: 40g / m 2 The following is a further preferred value: 30g / m 2 the following.

[0077] On the other hand, the outer surface sheet 16 can be made of any material depending on the product design, and can be any of the following: a breathable sheet, a non-breathable sheet, or a non-breathable sheet. If the sheet of the cooling body 20 opposite to the outer surface sheet 16 (the sheet oriented towards the non-face side of the cooling body 20) is a breathable sheet, then the outer surface sheet 16 is preferably a breathable sheet. Furthermore, the outer surface sheet 16 can be stretchable or non-stretchable. Examples of stretchable sheets include sheets containing elastic fibers as constituent fibers, sheets containing elastic filaments, and sheets that exhibit stretchability through a rib-stitch structure.

[0078] Furthermore, the weight per square meter of the outer surface sheet 16 is determined based on the considerations of maintaining the stability of the shape of the face mask body 2 and the shape of the cooling body 20, and further preventing the cooling body 20 from being seen through it and thus detracting from the appearance. From this perspective, the weight per square meter of the outer surface sheet 16 is preferably 10 g / m². 2 The above, more preferably 20g / m 2 The above is further preferred to be 30g / m 2 The above is further preferred to be 40g / m 2 That's all. Furthermore, from the viewpoint of preventing deviations caused by the weight of the mask and ensuring comfortable wear, the weight per square meter of the outer surface sheet 16 is preferably 100 g / m². 2 The following is more preferably 90g / m 2 The following is a further preferred value: 80g / m 2 The following is a further preferred value: 70g / m 2 the following.

[0079] like Figure 4 As shown, the mask body 2 with the above configuration is formed by folding the first sheet portion 10A and the second sheet portion 10B in half with the inner surface sheet 14 as the inner side and the longitudinal center line 100 as the center. The first sheet portion 10A and the second sheet portion 10B are joined together by the upper joint portion 4a formed near the upper edge portion 7 of the longitudinal center line 100 and the lower joint portion 4b formed on the lower edge portion 8 side of the longitudinal center line 100. That is, the closed end portion 6 of the mask body 2 is formed by the continuous integral portion of the first sheet portion 10A and the second sheet portion 10B, namely the longitudinal center line 100, the upper joint portion 4a which is subsequently joined to the upper side (nose side) of the longitudinal center line 100, and the lower joint portion 4b which is subsequently joined to the lower side (chin side) of the longitudinal center line 100.

[0080] Furthermore, there are no particular limitations on the method by which the first body portion 10A and the second body portion 10B are joined, as long as the two body portions 10A and 10B can be joined in a manner that prevents them from separating. For example, any method such as crimping, heat welding, ultrasonic welding, high-frequency welding, and adhesives can be used. In the example shown, the upper joining portion 4a and the lower joining portion 4b are configured in a way that forms striped patterns in the forming area, but this is not limited to this. For example, various configurations can be used, such as a continuous seal formed by crimping the entire surface of the forming area.

[0081] The shapes of the face-contact end 5, the closed end 6, the upper edge 7, and the lower edge 8 of the mask body 2 are appropriately adjusted to fit the wearer's face (especially the nose, cheeks, and jaw), and can be any shape such as straight lines, arcs, or shapes with convex or curved parts.

[0082] Before use, the mask body 2 with the above-described structure is folded in half along the longitudinal center line (closed-side end 6) to form a flat surface, with the first piece 10A and the second piece 10B folded together. Furthermore, in this state, the retaining part 30 is folded inward toward the inside of the mask body 2 for storage, as described below (see reference). Figure 4 This allows for a compact design. Furthermore, the mask body 2 is worn in such a way that, during use, it unfolds from the edge (face-contacting end 5) opposite to the longitudinal centerline 100 (closed-side end 6), making the folded inner surface of the mask body 2 the wearer's side. Specifically, the mask body 2 is configured such that, during use, the face-contacting end 5 of the first piece 10A and the face-contacting end 5 of the second piece 10B are pulled apart, causing the closed-side end 6 to protrude forward from the longitudinal centerline 100, resulting in a hollow, conformal three-dimensional shape for the mask body 2. In this three-dimensional mask body 2, the opening of the opened face-contacting end 5 closely follows the wearer's face (especially the nose, cheeks, and chin), thus minimizing gaps between the wearer's face and the mask body 2.

[0083] Furthermore, from the viewpoint that the surface area of ​​the inner surface (hereinafter referred to as the "back surface area") in the state of maintaining a three-dimensional shape is large enough to cover the wearer's mouth and nose, and to form a suitable internal space 4 between it and the wearer's face to reduce breathing difficulties, the mask body 2 is preferably 50cm. 2 The above, preferably 100cm 2 The above is further optimized to 140cm. 2 That's all. Furthermore, from the viewpoint of minimizing the gap between the back surface and the wearer's face, the preferred surface area is 400 cm². 2 Below, 300cm is preferred. 2 The following is a further preferred size: 200cm 2 Here, the weight (g) of the sheet forming the inner surface (i.e., the inner surface sheet 14) can be measured while it is held in a three-dimensional state. Based on this measured weight (g) and the predetermined weight per square meter (g / m²) of the inner surface sheet 14... 2 The surface area of ​​the back side is then calculated.

[0084] Furthermore, the main body 2 of the mask remains three-dimensional, and from the viewpoint of facilitating breathing, the volume of the internal space 4 when worn in the volume measurement mannequin HM is preferably 40 cm³. 3 The above, preferably 50cm 3 The above is further optimized to 60cm. 3 That's all. Furthermore, from the viewpoint of providing adequate humidity, the volume of the internal space 4 in this state is preferably 90 cm³.3 The following is a preferred value: 80cm 3 The following is a further preferred size: 70cm 3 the following.

[0085] Furthermore, the internal space 4 formed between the mask body 2 and the face of the volume measurement mannequin HM is not limited to a sealed space formed by the mask body 2 being in contact with the face of the volume measurement mannequin HM; there may also be a small gap between the mask body 2 and the face of the volume measurement mannequin HM. This small gap refers to the gap that would occur when the cooling mask 1 is worn using the usual method. Even with such a gap, it can be considered sealed along the edge of the mask body 2.

[0086] Here, the "volume measurement head model HM" can be a female head model (width 151.24mm, depth 206.82mm, height 233.01mm) shaped based on the average female head data (latest data as of February 3, 2021) manufactured by Digital Human Technology Inc. Furthermore, the "maintaining a three-dimensional state" when measuring the volume of the internal space 4 refers to the three-dimensional state after the cooling mask 1 is worn on the volume measurement head model HM (e.g., the aforementioned female head model).

[0087] Furthermore, the width of the aforementioned female version of the human head model refers to the straight-line distance between the most prominent points of the left and right auricles, the depth refers to the straight-line distance from the back of the head to the most prominent point of the nose, and the height refers to the straight-line distance from the top of the head to the most prominent point of the chin along the vertical direction (body axis direction). Therefore, the so-called "maintaining a three-dimensional state" means that the rear ear-hook hole 32 of one retaining part 30 and the rear ear-hook hole 32 of the other retaining part 30 are separated by the width (151.24 mm) of the female version of the human head model. In addition, the cooling mask 1 worn on the volume measurement human head model HM specifically has the following dimensions. In this embodiment, these dimensions are measured using a long-jaw caliper (CM-50L) manufactured by Mitutoyo Co., Ltd.

[0088] That is, such as Figure 5 As shown in (a), when the cooling mask 1 is maintained in a three-dimensional state (worn on a human head model HM for volume measurement), the vertical length Lopen from the nasal vertex to the chin vertex of the end face 5 is preferably 80 mm or more, more preferably 90 mm or more, further preferably 100 mm or more, and even more preferably 105 mm or more. Additionally, it is preferably 140 mm or less, more preferably 130 mm or less, further preferably 120 mm or less, and even more preferably 110 mm or less.

[0089] In addition, such as Figure 5 As shown in (b), when the cooling mask 1 is maintained in a three-dimensional state (worn on the volume measurement head model HM), the opening width (opening width Wopen when maintaining shape) between the face-contact side end 5 of the first piece 10A and the face-contact side end 5 of the second piece 10B is preferably 90 mm or more, more preferably 100 mm or more, further preferably 120 mm or more, and even more preferably 130 mm or more. Additionally, it is preferably 180 mm or less, more preferably 170 mm or less, further preferably 160 mm or less, and even more preferably 150 mm or less. Here, "opening width Wopen when maintaining shape" refers to the straight-line distance along the horizontal direction (orthogonal to the vertical and depth directions) between the furthest points of the face-contact side end 5 of the first piece 10A and the face-contact side end 5 of the second piece 10B when the cooling mask 1 is maintained in a three-dimensional state (worn on the volume measurement head model HM).

[0090] Furthermore, such as Figure 5 As shown in (a), when the cooling mask 1 is maintained in a three-dimensional state (worn on a human head model HM for volume measurement), the conformal depth Dopen along the depth direction from the face-contact end 5 to the occlusion end 6 is preferably 40 mm or more, more preferably 50 mm or more, further preferably 60 mm or more, and even more preferably 70 mm or more. Additionally, it is preferably 130 mm or less, more preferably 120 mm or less, further preferably 100 mm or less, and even more preferably 90 mm or less. Here, "conformal depth Dopen" refers to the straight-line distance extending horizontally (in a direction orthogonal to the vertical and width directions) from the point of greatest expansion (expansion point) of the occlusion end 6 to the face-contact end 5.

[0091] Furthermore, the volume of the internal space 4 is measured by using a human head model HM (e.g., the female version of the human head model mentioned above) to reproduce the usage state of the cooling mask 1, and by converting it into three-dimensional data using a three-dimensional measuring machine.

[0092] In addition to measuring the volume of the internal space 4 using the three-dimensional data method described above, the volume can also be determined by measuring the amount of water remaining inside the cooling mask 1, as shown in Japanese Patent Application Publication No. 2012-205926. Specifically, firstly, a liquid-impermeable membrane is disposed over the entire inner surface of the mask body 2, maintaining the cooling mask 1 in a three-dimensional shape with the same shape-preserving length Lopen, shape-preserving opening width Wopen, and shape-preserving depth Dopen as when worn on the volume-measuring head model HM. Secondly, the cooling mask 1, maintained in a three-dimensional state, is positioned with the face-contact end 5 facing upwards (and the closed end 6 facing downwards), and water is injected into the interior of the cooling mask 1. The face of the volume-measuring head model HM is placed face down close to the water-filled cooling mask 1 as described above, and the retaining part 30 is worn on the ears of the volume-measuring head model HM. Subsequently, the volume-measuring human head model HM is removed from the cooling mask 1, and the amount of water remaining inside the cooling mask 1 is measured. By measuring the amount of water remaining inside the cooling mask 1 in this way, a value that is approximately the same as the measurement method using three-dimensional data with the aforementioned female version human head model can be obtained. Therefore, depending on the shape of the cooling mask 1, even when it is difficult to convert it into three-dimensional data, the volume of the internal space 4 can be measured by the method disclosed in Japanese Patent Application Publication No. 2012-205926.

[0093] Furthermore, the volume of the internal space 4 can be calculated as follows. That is, it can be calculated as follows: the volume of the cooling mask 1 when it is kept in a three-dimensional state with the same shape-preserving length Lopen, shape-preserving opening width Wopen, and shape-preserving depth Dopen as when it is worn on the volume measurement head model HM (the volume of the cooling mask 1 when not worn) is subtracted from the volume of the part of the volume measurement head model HM that enters the cooling mask 1 when it is worn on the volume measurement head model HM (the volume of the insertion part of the volume measurement head model HM).

[0094] Here, the volume of the insertion portion of the head model HM for volume measurement is proportional to the perimeter of the opening at the face-contact end 5 when the cooling mask 1 is held in a three-dimensional state, and can be determined by the following method. That is, using the same steps as measuring the amount of water remaining inside the cooling mask 1, a liquid-impermeable membrane is disposed over the entire inner surface of the mask body 2, and the cooling mask 1 is held in a three-dimensional state, filling its interior with water. The volume of water at this time is measured to determine the "volume of the cooling mask 1 when not worn". Furthermore, using the same steps as measuring the amount of water remaining inside the cooling mask 1, the amount of water remaining after being placed close to the face of the head model HM for volume measurement is measured. Then, the difference between the amount of water before and after being placed close to the face of the head model HM for volume measurement is calculated, and this difference is taken as the "volume of the insertion portion of the head model HM for volume measurement".

[0095] [Structure of the retaining section]

[0096] The retaining part 30 is engaged with both ends of the mask body 2 in the width direction, holding the mask body 2 in place on the wearer's face. Hereinafter, an example of the retaining part 30 will be described.

[0097] In this embodiment, the retaining part 30 is an ear loop that can be installed on the wearer's ears, and is provided in pairs at the left and right ends of the long side (horizontal width direction) of the mask body 2. Figure 2 As shown, the retaining part 30 has an ear hook body 31, an ear hook hole 32 for the wearer's ear to be inserted, and a sealing part 39 for joining the mask body 2 with the ear hook body 31 (see reference). Figure 3 and Figure 6 (b)).

[0098] The ear loop body 31 has an upper edge, a lower edge, an open edge on the open side of the retaining portion 30 that is not engaged with the mask body 2, and a joining edge that engages with the face-contacting end 5 of the mask body 2. In this embodiment, the ear loop body 31 is planar and forms a generally quadrilateral with rounded corners. Specifically, the upper and lower edges taper towards the open edge from the joining edge and are curved at the portion connecting to the open edge.

[0099] In this embodiment, the total length (mm) of the pair of retaining portions 30 in the direction parallel to the width direction of the mask body 2 is preferably less than or equal to the width (mm) of the mask body 2. In this embodiment, the retaining portions 30 are a pair; therefore, the length (mm) of one retaining portion 30 in the direction parallel to the width direction of the mask body 2 is less than the width (mm) of one mask body 2 bisected by the longitudinal centerline 100 (closed-side end 6). Thus, when the cooling mask 1 is folded in half at the longitudinal centerline, the retaining portions 30 overlap with the mask body 2 and are unnaturally folded into the interior of the mask body 2, which can suppress the increase in thickness and the intertwining of the retaining portions 30, allowing for a more compact storage of the cooling mask 1. Furthermore, as... Figure 6 As shown in (b), when the retaining part 30 is folded to the inside of the mask body 2, the retaining part 30 is less susceptible to contamination, which can further improve hygiene.

[0100] The retaining part 30 can be made of the same material as the mask body 2 or a different material. From the viewpoint of improving the fit of the mask body 2, a stretchable material is preferred, and a material that can easily stretch along the width of the mask body 2 is also acceptable. In this embodiment, the retaining part 30 is preferably made of non-woven fabric, and more preferably of stretchable non-woven fabric. From the viewpoint of adhesion to the mask body 2, it is preferable to include thermoplastic resin as the constituent fiber. Furthermore, from the viewpoint of ease of processing, it is more preferable to include polypropylene. In addition, the retaining part 30 may further include thermoplastic resin other than polypropylene, for example, preferably one or more selected from polyurethane, polyethylene, and polyethylene terephthalate, and more preferably synthetic fibers made of polyurethane. With such a configuration, the softness and fit of the retaining part 30 can be effectively exhibited, and sufficient strength can be exhibited when using the cooling mask 1.

[0101] Furthermore, the retaining part 30 is not limited to the aforementioned flat ear loops, as long as it can hold the mask body 2 in front of the wearer's face; it can use any ear loop commonly used with masks, such as... Figure 10 The holding part 30 can be configured in various ways, such as a rubber cord-like loop 30' (holding part) or one or more straps (not shown) that extend from the face-fitting end 5 of the first piece 10A to the face-fitting end 5 of the second piece 10B. Furthermore, the holding part 30 is not limited to a separate component joined to both ends of the mask body 2 in the width direction; it can also be integrally formed with the mask body 2.

[0102] [Composition of the cooling system]

[0103] like Figure 7As shown, the cooling body 20 has a water-retaining layer 24 that holds water, and is disposed on the mask body 2 such that at least a portion of it comes into direct or indirect contact with the wearer's face when worn.

[0104] Specifically, the form of the cooling body 20 can be exemplified by the forms shown in (i) and (ii) below.

[0105] (i) As one form of the cooling body 20, a sheet-like form having a water-retaining layer 24 can be exemplified. In this case, the water-retaining layer 24 is obtained by coating one side of the sheet with a slurry, which is obtained by mixing water into a powdered or fibrous water-retaining material. The sheet can be any of the first sheet 26, the second sheet 28, and the substrate layer 22, which will be described later.

[0106] (ii) Alternatively, as another form of the cooling body 20, the water-retaining material itself can be exemplified as the water-retaining layer 24, maintaining its shape. In this case, it can be obtained by cutting the water-retaining material into the desired size and making it contain water.

[0107] In addition, in this specification, the term "water-retaining material" refers to a material that has the ability to retain water (water absorption or water removal). As long as it can retain water, there are no particular restrictions on its type, but materials with excellent vapor diffusion properties are preferred.

[0108] In either of the embodiments described in (i) and (ii) above, the cooling body 20 may be configured such that a water-retaining material is sealed within a bag-like structure formed by joining the peripheral portions of the first sheet 26 and the second sheet 28 together. By constructing the bag-like structure from the first sheet 26 and the second sheet 28, the cooling body 20 can prevent accidental detachment of the constituent material, thereby further improving manufacturing efficiency and allowing for appropriate adjustment of the steam volume.

[0109] As one form of the cooling body 20, it is a rectangular flat body, having a substrate layer 22 and a water-retaining layer 24 stacked on the substrate layer 22. In addition, the cooling body 20 further includes a first sheet 26 and a second sheet 28 arranged opposite to the first sheet 26 with the substrate layer 22 and the water-retaining layer 24 in between.

[0110] (Water-retaining layer)

[0111] In the configuration described in (i) above, the water-retaining layer 24 has a water-retaining material dispersed on the substrate layer 22, and water retained in the water-retaining material. Examples of water-retaining materials include one or more selected from carbon components, fibrous materials, and water-absorbing powders.

[0112] Furthermore, in the case of the above-described (ii) configuration (where the water-retaining layer 24 also functions as a water-retaining material), the water-retaining layer 24 and the water-retaining material can be made from various fiber raw materials, such as blended hydrophilic fibers or a mixture of hydrophilic fibers and synthetic fibers. Examples of fiber raw materials include one or more selected from polyethylene, polypropylene, polyester, rayon, cotton, and pulp.

[0113] The carbon component has water-retention capabilities; for example, one or more types selected from activated carbon, acetylene black, and graphite can be used. Furthermore, as a fibrous material, hydrophilic fibers, especially cellulose fibers, are more preferred. As cellulose fibers, chemical fibers (synthetic fibers) or natural fibers can be used. Further, as a water-absorbing powder other than those mentioned above, one or more types selected from vermiculite, sawdust, silica gel, calcium silicate, zeolite, pulp powder, and water-absorbing polymers can be used.

[0114] Examples of water-absorbing polymers include cross-linked hydrophilic polymers capable of absorbing and retaining more than 20 times their own weight in liquid. The shape of the water-absorbing polymer can be spherical, blocky, bunch-like, or fibrous. The mass-average particle size of the water-absorbing polymer is preferably 1 μm or more, more preferably 10 μm or more, and even more preferably 100 μm or more. Furthermore, the average particle size of the water-absorbing polymer is preferably 1000 μm or less, more preferably 700 μm or less, and even more preferably 500 μm or less. The particle size of the water-absorbing polymer is determined by laser diffraction.

[0115] Specific examples of water-absorbing polymers include one or more selected from starch, cross-linked carboxymethyl cellulose, polymers or copolymers of acrylic acid or alkali metal salts of acrylate, polyacrylic acid and its salts, and polyacrylate grafted polymers. Among these, polymers or copolymers of acrylic acid or alkali metal salts of acrylate, polyacrylic acid and its salts, and polyacrylate grafted polymers are preferred from the viewpoint of easily maintaining the amount of water carried within a specific range.

[0116] Examples of forms of the water-retaining layer when using a water-absorbing polymer include: (a) a single layer formed by sandwiching a water-absorbing polymer between two breathable sheets; (b) a single layer in which the water-absorbing polymer is directly laminated onto the substrate layer 22; or (c) a laminated structure having a first water-absorbing polymer layer and a second water-absorbing polymer layer, wherein the first water-absorbing polymer layer is formed by the water-absorbing polymers being adjacent and arranged in layers, the second water-absorbing polymer layer is adjacent to the first water-absorbing polymer layer, and the second water-absorbing polymer layer is formed by sandwiching powder of a water-absorbing resin between two breathable sheets.

[0117] The water retained in the water-retaining material can come from electrolyte aqueous solutions (such as aqueous solutions of alkali metals, alkaline earth metals, etc.). In addition, preservatives, antibacterial agents, bactericides or antioxidants such as ethanol, methylparaben, ethylparaben, propylparaben, butylparaben, phenoxyethanol, 1,3-butanediol, propylene glycol, dipropylene glycol, etc. can also be added.

[0118] From the viewpoint of improving the cooling effect of the cooling mask 1 during the initial wearing stage and enhancing the sustainability of the vapor released from the cooling body 20, thereby maintaining the cooling effect brought by the cooling body 20 for a longer period of time, the initial water content retained in the water-retaining layer 24 is preferably 1% or more by mass of the maximum water absorption capacity of the water-retaining layer 24, more preferably 2% or more by mass, further preferably 3% or more by mass, and even more preferably 4% or more by mass. Furthermore, from the viewpoint of suppressing the weight of the cooling body 20 and preventing the cooling mask 1 from shifting and falling relative to the face, the initial water content is preferably 20% or less by mass of the maximum water absorption capacity of the water-retaining layer 24, more preferably 15% or less by mass, further preferably 10% or less by mass, and even more preferably 7% or less by mass.

[0119] (Method for determining maximum water absorption)

[0120] The maximum water absorption capacity of the water-retaining layer 24 can be determined, for example, by the following method: First, weigh a 250-mesh (61 μm) nylon textile bag (100 mm × 150 mm) and the sample, and measure the tare weight of the mesh bag and the weight of the sample. Next, place the sample inside the mesh bag, stand it upright in a 300 mL beaker, add 300 mL of deionized water without direct contact with the mesh bag, and soak for 30 minutes to allow it to fully swell. Then, hang it for 10 minutes, drain the water, and weigh it to two decimal places using a chemical balance. Finally, using the calculated "total weight of the mesh bag," "tare weight of the mesh bag," and "sample weight," calculate the maximum water absorption capacity using the following formula.

[0121] "Maximum water absorption capacity" = "Total weight of mesh bag" - "Tare weight of mesh bag" - "Sample weight"

[0122] Based on the above viewpoints, the initial water content retained in the water-retaining layer 24 (i.e., the water content immediately after opening the packaging bag 200, such as the oxygen barrier bag) is preferably an average of 1 cm. 2 The concentration is 0.04 ml or more, more preferably an average of 1 cm. 2 The concentration is 0.08 ml or more, and more preferably an average of 1 cm. 2 The concentration is 0.10 ml or more; additionally, it is preferred to have an average concentration of 1 cm. 2 Less than 0.40 ml, more preferably an average of 1 cm 2The concentration is less than 0.30 ml, and more preferably an average of 1 cm. 2 It is less than 0.25ml.

[0123] (Substrate layer)

[0124] The substrate layer 22 is provided such that it covers the surface of the water-retaining layer 24 that is opposite to the first sheet 26.

[0125] When the substrate layer 22 is positioned on the face side during wear, it promotes the generation of vapor to the non-face side (the outer side of the mask body 2), thereby enhancing the cooling effect inside the mask body 2 through the accompanying heat of vaporization. In addition, by suppressing the evaporation of moisture from the water-retaining layer 24 to the face side, it is possible to suppress facial stuffiness caused by vapor released from the cooling body 20.

[0126] On the other hand, when the substrate layer 22 is configured such that it is located on the non-face side when worn, it can promote the generation of vapor toward the face side, thereby enhancing the cooling effect on the face through the accompanying heat of vaporization. In addition, by suppressing the evaporation of moisture from the water-retaining layer 24 toward the non-face side, the persistence of the vapor released from the cooling body 20 can be improved, thus maintaining the cooling effect generated by the cooling body 20 for a longer period of time.

[0127] Even when the substrate layer 22 is positioned on the face side or the non-face side as described above, the amount of vapor generated on the non-face side (outer side of the mask body 2) or the face side can be appropriately adjusted according to the breathability of the substrate layer 22. For example, if it is desired to promote vapor generation by the heat of vaporization associated with the substrate layer 22, thereby further improving the cooling effect inside the mask body 2, a sheet with a breathability of 50 seconds / 100mL or less, preferably 10 seconds / 100mL or less, and more preferably 1 second / 100mL or less can be used as the substrate layer 22. In addition, if it is desired to improve the duration of cooling time inside the face or the mask body 2, a non-breathable (breathability of 80,000 seconds / 100mL or more) or poorly breathable (breathability of 30,000 seconds / 100mL or more) sheet can be used. The breathability of the substrate layer 22 is preferably 50,000 seconds / 100mL or more, and more preferably 80,000 seconds / 100mL or more.

[0128] Furthermore, when the substrate layer 22 is arranged in a manner that is not on the face side, the productivity of setting the cooling body 20 on the mask body 2 is improved by stacking the water-retaining layer 24 on the substrate layer 22.

[0129] As such a substrate layer 22, a synthetic resin film can be used, for example, such as a polyethylene film or a polyethylene terephthalate film. The synthetic resin film can be a single layer or a multilayer laminate. Non-woven fabric, paper, or film, or two or more of these laminates, can be used.

[0130] (Sheet 26 and Sheet 28)

[0131] At least one of the first sheet 26 and the second sheet 28 may be a non-breathable sheet (breathability of 80,000 seconds / 100mL or more) or a poorly breathable sheet (breathability of 30,000 seconds / 100mL or more). Alternatively, the other of the first sheet 26 and the second sheet 28 may be a breathable sheet.

[0132] The air permeability of the non-air-permeable or poorly air-permeable sheet is preferably 50,000 seconds / 100mL or more, and more preferably 80,000 seconds / 100mL or more. By using such a non-air-permeable or poorly air-permeable sheet for at least one of the first sheet 26 and the second sheet 28, the direction and amount of moisture evaporation from the water-retaining layer 24 can be controlled, thereby improving the continuity of the vapor released from the cooling body 20 and maintaining the cooling effect of the cooling body 20 for a longer period of time.

[0133] As such non-breathable or poorly breathable sheets, synthetic resin films can be used alone or in multiple layers. Furthermore, depending on the application, non-breathable or poorly breathable sheets can have nonwoven fabrics laminated on their outer surface to improve texture. Nonwoven fabrics can be selected from needle-punched nonwoven fabrics, hot-air nonwoven fabrics, and spunbond nonwoven fabrics, with laminates comprising polyethylene film and pulp sheets being preferred. Additionally, non-breathable or poorly breathable sheets, as long as they have low overall breathability, can also possess localized breathability.

[0134] From the viewpoint of slowly releasing the generated vapor without excessive humidification, the breathability of the breathable sheet is preferably 350 seconds / 100mL or less, more preferably 100 seconds / 100mL or less. By using such a breathable sheet for either the first sheet 26 or the second sheet 28, the cooling effect on the face can also be improved through the heat of vaporization or heat dissipation accompanying the evaporation of moisture.

[0135] As such a breathable sheet material, a porous sheet material made of synthetic resin is preferred, for example. Specifically, an extended membrane containing polyethylene or polypropylene can be used as an example. When using this porous sheet material, a nonwoven fabric can be laminated on the outer surface of the porous sheet material to improve the texture of the sheet material. Examples of nonwoven fabrics include needle-punched nonwoven fabrics, hot-air nonwoven fabrics, and spunbond nonwoven fabrics. The sheet material can also be one that allows oxygen or water vapor to pass through but not water, and if leak-proof properties are considered, a sheet material other than a porous sheet material can also be used. For example, as a breathable sheet material, artificial fibers such as polyamide, vinylon, polyester, rayon, cellulose acetate, acrylic resin, polyethylene, polypropylene, and polyvinyl chloride can be used; or woven fabrics, nonwoven fabrics, paper, synthetic paper, etc., made from one or more natural fibers selected from pulp, cotton, hemp, silk, and animal hair can be used.

[0136] Preferably, one of the first sheet 26 and the second sheet 28 is breathable, and the other is non-breathable or poorly breathable. In this case, the orientation towards the face or non-face can be adjusted depending on the purpose.

[0137] For example, a breathable sheet can be used on the face side, while a non-breathable or poorly breathable sheet can be used on the non-face side. This improves the heat absorption effect on the face, thus enhancing the cooling effect of the cooling mask 1 in the initial wearing stage and providing a more stable cooling sensation with less temperature fluctuation over a longer period of time.

[0138] On the other hand, by using a non-breathable or poorly breathable sheet on the face side and a breathable sheet on the non-face side, the amount of vapor released into the internal space 4 of the mask body 2 can be suppressed, thus suppressing the humidity in the internal space 4 and reducing damp heat. In addition, in this case, the heat dissipation effect generated by vaporization to the outside of the cooling mask 1 (external atmosphere) can be improved, so the cooling body 20 can be used to further reduce the temperature inside the mask body 2.

[0139] (Fragrance ingredients)

[0140] The cooling body 20 may, for example, be formulated with or have flavoring ingredients described in "Synthetic Fragrance Chemistry and Commercial Knowledge" (by Genichi Into, published by Chemical Industry Daily Co., Ltd.) added to any part of it without impairing the effects of the present invention. Specifically, examples include myrcene, farnesene, pinene, limonene, camphene, phellandrene, terpinen, terpinolene, p-cymene, cedrene, and caryophyllene. Terpenes such as 1, 2, 3-(4-tert-butylphenyl)-propanal, 4-(4-hydroxy-4-methylpentyl)-3-cyclohexene-1-carboxaldehyde, vanillin, etc.; Aromatic alcohols such as benzyl alcohol, phenylethanol, pamplefleur (2-methyl-4-phenyl-1-pentanol), dimethylbenzyl alcohol, phenylhexanol (3-methyl-5-phenylpentanol), etc.; Phenolic compounds such as anethole, eugenol, etc.; Lactones such as γ-nonanolide, γ-undecaprolactone, etc.

[0141] (Cooling ingredients)

[0142] Regarding the cooling body 20, from the viewpoint of further imparting a cooling sensation, a cooling ingredient can be formulated or added to any part of the body without impairing the effect of the invention. This cooling ingredient preferably contains an agonist that acts as a cold receptor (TRPM8) in temperature-sensitive TRP (Transient Receptor Potential) channels present in the body. Examples include: L-menthol, DL-menthol, menthol, menthyl glycol, eucalyptol, menthyl glyceryl ether, menthone glyceryl acetal, butylcyclohexanone, isoprene, trimethylisopropylbutanamide, menthoxypropylene glycol, camphor, etc. Plant or essential oils containing a TRPM8 agonist, such as peppermint oil, spearmint oil, and eucalyptus oil, can also be used. These can be used individually or in combination of two or more. From the perspective of comfort, effectiveness, and safety during use, the preferred ingredient is one or more of menthol, menthyl lactate, menthyl succinate, menthyl glutarate, trimethylisopropylbutanamide, menthol, and camphor, with menthol being more preferred.

[0143] (Amount of water vapor generated by the cooling element)

[0144] Regarding the cooling body 20 with the above-described structure, the amount of water vapor generated toward the wearer's face is preferably 2.5 mg / (cm³). 2 • Hours or more, more preferably 5.0 mg / (cm³) 2 • Hours or more, more preferably 7.5 mg / (cm³) 2 • Hours or more. By setting the water vapor production rate to this level, the skin can be effectively cooled by the vaporization of water.

[0145] Furthermore, regarding the cooling body 20, the aforementioned water vapor generation rate is preferably 20.0 mg / (cm³). 2 Less than 15.0 mg / (cm³) per hour, more preferably 15.0 mg / (cm³) per hour. 2 Less than 10.0 mg / (cm³) per hour, more preferably 10.0 mg / (cm³) per hour. 2 (hours) or less. By setting the water vapor production rate to this level, the humidity inside the interior space 4 can be suppressed, reducing damp heat.

[0146] The amount of water vapor generated towards the wearer's face is the amount of water vapor produced by using Figure 11 The values ​​measured by the measuring device 40 shown are as follows. Furthermore, in the following description, the cooling body 20, which is sealed in a non-permeable packaging bag 200 or the like, is taken as the object. The process begins by opening the non-permeable packaging bag 200, and continues from the opening until the cooling body is placed... Figure 11 The time required for the measuring device 40 shown, i.e., the time point 5 seconds after the opening, is defined as the "start time point of water vapor generation".Figure 11 The measuring device 40 shown includes: an aluminum measuring chamber (volume 4.2L) 41; an inflow path 42 that allows dehumidified air (humidity less than 2%, flow rate 2.1L / min) to flow into the lower part of the measuring chamber 41; an outflow path 43 that allows air to flow out from the upper part of the measuring chamber 41; an inlet thermo-hygrometer 44 and an inlet flow meter 45, which are installed in the inflow path 42; an outlet thermo-hygrometer 46 and an outlet flow meter 47, which are installed in the outflow path 43; and a thermometer (thermometer) 48, which is installed inside the measuring chamber 41. The thermometer 48 uses a thermometer with a temperature resolution of approximately 0.01°C. Furthermore, the steam generation amount in this specification refers to the total amount measured from the "steam generation start point" of the cooling body 20 until one hour later.

[0147] In addition, the amount of water vapor generated by the cooling body 20 can be achieved by adjusting the following properties within the composition and numerical range of the above-mentioned elements: water retention performance, which is specific based on the type of water-retaining material used in the water-retaining layer 24 and the initial water content; and air permeability performance, which is specific based on the dehydration rate, orientation of the first sheet 26, and air permeability, which are specified by the viscosity and boiling point of the water retained in the water-retaining layer 24.

[0148] (Configuration of the cooling system)

[0149] As described above, the cooling body 20 with the above configuration is disposed on the mask body 2 such that at least a portion of it comes into direct or indirect contact with the wearer's face when the mask body 2 covers the wearer's mouth and nose (when worn). In this embodiment, the cooling body 20 is disposed between the inner surface sheet 14 and the outer surface sheet 16 of the mask body 2, so that when worn, the cooling body 20 comes into indirect contact with the wearer's face through the inner surface sheet 14.

[0150] However, this is not the only possibility. The cooling element 20 can be housed within a pocket-shaped storage portion on the inner surface of the mask body 2, allowing indirect contact between the cooling element 20 and the wearer's face through this storage portion. Alternatively, the cooling element 20 can be fixed to the inner surface of the mask body 2 using an adhesive or similar agent, allowing direct contact between the cooling element 20 and the wearer's face. Furthermore, in areas where heat conduction is impossible between the wearer's face and the cooling element 20, other components can be placed between them.

[0151] Preferably, the area of ​​the cooling body 20 that directly or indirectly (e.g., in contact with the wearer's face through a sheet) in contact with the wearer's face (the contact area) is 10% or more of the surface area of ​​the side of the cooling body 20 opposite to the wearer's face. Specifically, from the viewpoint of improving the heat transfer efficiency from the wearer's face to the cooling body 20 and improving the heat absorption efficiency of the heat of vaporization of water heated by the wearer's body temperature, the proportion of the surface area of ​​the side of the cooling body 20 opposite to the wearer's face that directly or indirectly contacts the wearer's face (the contact area) is preferably 10% or more, more preferably 20% or more, and even more preferably 30% or more. In addition, from the viewpoint of extending the duration of cooling, the proportion of the above-mentioned contact area of ​​the cooling body 20 is preferably 100% or less, more preferably 80% or less, and even more preferably 50% or less.

[0152] (Methods for measuring contact area)

[0153] Here, the contact area of ​​the cooling body 20 can be determined, for example, by the following two methods.

[0154] First, the first method calculates the contact area of ​​the cooling body 20 based on the weight per square meter of the inner surface sheet 14. Specifically, first, the surface area of ​​the side of the cooling body 20 opposite to the wearer's face is defined as A1, and the weight WR1 of the A1 portion of the inner surface sheet 14 is calculated based on the weight per square meter of the inner surface sheet 14. Then, a cooling mask 1 using the cooling body 20 is manufactured by attaching activated carbon to a female head model (approximately 18cm wide, 21cm deep, and 26cm high) shaped according to the average female head data (latest data at the time of application) manufactured by Digital Human Technology Inc. Then, the cooling mask 1 is worn on the female head model for 10 minutes and then removed. Afterward, the portion of the inner surface sheet 14 overlapping with the cooling body 20 is cut off, and the inner surface sheet 14 corresponding to the position of the cooling body 20 is removed. Then, the portion without attached activated carbon is cut off, the weight is measured, and defined as WR2. Subsequently, based on the weight WR1 of portion A1 of the inner surface sheet 14 (the portion of the inner surface sheet 14 that is stacked with the cooling body 20) and the weight WR2 of portion A1 of the inner surface sheet 14 without activated carbon, obtained by this method, the weight WR3 of portion A1 of the inner surface sheet 14 with activated carbon (i.e., the contact portion) is calculated according to the following formula. The weight WR3 of the contact portion obtained by this method is the weight of the inner surface sheet 14 alone, excluding the weight of the activated carbon.

[0155] "WR1-WR2 = Weight of the inner surface sheet 14 of the activated carbon attachment area (contact portion) WR3"

[0156] Subsequently, based on the weight per square meter of the inner surface sheet 14, an area equivalent to the weight WR3 is calculated, and this area is set as the contact area of ​​the cooling body 20.

[0157] Alternatively, powders of a different color than the inner surface sheet 14 can be used instead of activated carbon during the measurement.

[0158] Alternatively, the second method involves calculating the contact area of ​​the cooling body 20 using three-dimensional shape data. Specifically, firstly, a light-blocking material is applied to the surface of a female head model with an internal cavity, modeled using average head data (latest data at the time of application) manufactured by Digital Human Technology Inc. Three points—the left and right temples and the throat—are marked as reference points on the inside of the head model (within the cavity). Then, using Artec Eva (manufactured by ARTEC 3D), three-dimensional data (reference three-dimensional data) from the inside of the head model is acquired. Next, a partially colored cooling mask 1 with the cooling body 20 is worn on a transparent head model with the reference points set at the same locations, and three-dimensional data (measured three-dimensional data) from the inside of that head model is acquired. Using the three-dimensional image analysis software 3D-RUGLE (manufactured by Medic Engineering Corporation), the two 3D images (reference three-dimensional data and measured three-dimensional data) obtained in the above manner are overlaid according to the aforementioned reference points to identify the contact portion of the cooling body 20 with the surface of the head model. When specifying the contact portion, considering that the contact area may change due to movement in the case of a human body, the colored portion of the cooling mask 1 (the portion where the cooling body 20 is provided) and the portion whose gap distance with the surface of the human head model is within the range of -0.5mm to 0.5mm are defined as the contact portion of the cooling body 20. Then, the area of ​​the contact portion of the cooling body 20 specified in this way is calculated and defined as the contact area of ​​the cooling body 20. By using the second method of calculation using three-dimensional shape data in this way, approximately the same result as the first method described above can also be obtained.

[0159] like Figure 2 As shown, in this embodiment, the cooling elements 20 are arranged symmetrically on both the first body portion 10A and the second body portion 10B, with the longitudinal center line 100 as the boundary. In the illustrated example, each of the left and right wings is provided with one cooling element 20, for a total of two cooling elements 20.

[0160] Each cooling element 20 is arranged at a predetermined distance from the longitudinal center line 100, such that it primarily contacts the wearer's cheeks directly or indirectly when the mask body 2 covers the wearer's mouth and nose. Specifically, each cooling element 20 is preferably arranged such that the distance D1 between the longitudinal center line 100 of the mask body 2 and the end of each cooling element 20 on the side of the longitudinal center line 100 is 5 mm or more, and more preferably 10 mm or more. Furthermore, from the viewpoint of improving the cooling sensation to the wearer's face, this distance D1 is preferably as large as possible within the range where each cooling element 20 is housed within the first sheet portion 10A and the second sheet portion 10B. Here, this distance D1 refers to the straight-line distance between the end of each cooling element 20 closest to the longitudinal center line 100 and the longitudinal center line 100, along a direction orthogonal to the longitudinal center line 100.

[0161] Furthermore, each cooling element 20 is preferably arranged such that the distance D2 between the end of each cooling element 20 closest to the face-contact side end 5 and the face-contact side end 5 is 28 mm or less, more preferably 23 mm or less. Additionally, from the viewpoint of improving the cooling sensation to the wearer's face, this distance D2 is preferably as small as possible within the area where each cooling element 20 is housed within the first sheet portion 10A and the second sheet portion 10B. Here, this distance D2 refers to the straight-line distance between the end of each cooling element 20 closest to the face-contact side end 5 and the face-contact side end 5, along a direction orthogonal to the longitudinal centerline 100. Furthermore, as... Figure 2 As shown, when the ends of the surface-facing end 5 of each cooling body 20 are not parallel to each other, the straight-line distance between the farthest parts can be set as distance D2.

[0162] Furthermore, from the viewpoint of allowing the cooling body 20 to contact the wearer's cheek and utilize their own body temperature to vaporize moisture, this distance D2 is preferably 50% or less of the width D3 of each panel 10A, 10B, more preferably 40% or less, and even more preferably 30% or less. Additionally, from the viewpoint of properly vaporizing moisture and avoiding over-humidification, this distance D2 is preferably 10% or more of the width D3 of each panel 10A, 10B, more preferably 15% or more, and even more preferably 20% or more. Here, the width D3 of each panel 10A, 10B refers to the width of the mask body 2 bisected by the longitudinal centerline (closed-side end 6), specifically, the straight-line distance between the longitudinal centerline (closed-side end 6) and the face-contact end 5 along a direction orthogonal to the longitudinal centerline 100. Furthermore, as... Figure 2 As shown, when the longitudinal centerline (blocking side end 6) and the facing side end 5 are not parallel to each other, the straight-line distance of the farthest part can be set as the horizontal width D3.

[0163] Furthermore, the cooling elements 20 are preferably arranged such that the total area of ​​all cooling elements 20 disposed on the mask body 2 has a predetermined percentage relative to the area of ​​the entire surface of the mask body 2 on the wearer side. Specifically, from the viewpoint of easily and effectively cooling the inside of the mask, the proportion of the total area occupied by the cooling elements 20 relative to the area of ​​the entire surface of the mask body 2 on the wearer side is preferably 40% or more, more preferably 42% or more. In addition, from the viewpoint of preventing excessive humidification, this proportion is preferably 80% or less, more preferably 65% ​​or less. In addition, in this embodiment, the area of ​​the entire surface of the mask body 2 on the wearer side refers to the surface area of ​​the inner surface of the mask body 2 in a three-dimensional state, that is, the aforementioned "back surface area".

[0164] Furthermore, the planar shape of the cooling body 20 is not particularly limited and can be circular, polygonal, etc. From the viewpoints of manufacturing efficiency, ease of use, and cooling effect, a rectangular or approximately square quadrilateral shape is preferred, and an approximately square shape is more preferred from the viewpoint of ease of use. In addition, it is preferable, for example, to provide one or two or more cooling bodies 20 in the cooling mask 1, preferably to provide one or two or more in each panel, and more preferably to provide them in the left and right panels, but it is not limited thereto. Furthermore, when multiple cooling bodies 20 are provided, the cooling characteristics of the multiple cooling bodies 20 may be the same or different, but it is more preferable that they are the same.

[0165] (10-hour average relative humidity and 10-hour average temperature)

[0166] The cooling mask 1, which has the above-mentioned structure and water vapor generation properties, can suppress the humidity in the internal space 4 for a long time and can cool the wearer's face for a long time.

[0167] Specifically, in the cooling mask 1 equipped with the following cooling body 20, the 10-hour average relative humidity in the internal space 4 (i.e., the 10-hour average relative humidity in the area where the cooling body 20 does not directly or indirectly contact the face) can be suppressed to below 80%. In the cooling body 20, the first sheet 26 is made of a breathable material oriented towards the face, and the second sheet 28 is made of a non-breathable or poorly breathable material. Furthermore, the 10-hour average temperature at the point where the cooling body 20 directly or indirectly contacts the wearer's face can be suppressed to below 29°C.

[0168] More specifically, the average relative humidity of the cooling mask 1 over 10 hours is more preferably below 90%, and even more preferably below 80%. In addition, the average temperature of the cooling mask 1 over 10 hours is more preferably below 29.5°C, and even more preferably below 29.0°C.

[0169] Furthermore, the cooling mask 1 equipped with the following cooling body 20 can suppress the 10-hour average relative humidity in the internal space 4 to below 50%, wherein the first sheet 26 of the cooling body 20 is made of a non-breathable or poorly breathable material and is oriented towards the face side, while the second sheet 28 is made of a breathable material. Additionally, the 10-hour average temperature at the point where the cooling body 20 directly or indirectly contacts the wearer's face can be suppressed to below 28.0°C.

[0170] More specifically, the average relative humidity of the cooling mask 1 over 10 hours is more preferably below 60%, and even more preferably below 50%. In addition, the average temperature of the cooling mask 1 over 10 hours is more preferably below 28.5°C, and even more preferably below 27.5°C.

[0171] (Methods for measuring temperature and relative humidity)

[0172] Here, temperature and relative humidity are measured using the following method. Specifically, a humidity sensor is placed on the nose (non-contact part of the cooling body) of a female human head model (approximately 18cm wide, 21cm deep, and 26cm high), modeled according to the average female head data (latest data at the time of application) manufactured by Digital Human Technology Inc., and a temperature sensor is placed on the cheek (contact part of the cooling body), secured with surgical tape to prevent movement. Then, in an environment of 30°C and 40% RH, the cooling mask 1 is worn on the female human head model, and the temperature and humidity changes are measured every 30 seconds. Alternatively, the LT-ST08-12 (manufactured by Gram Corporation) can be used as the temperature sensor, and the Hygrochron (manufactured by KN LABORATORIES) can be used as the humidity sensor.

[0173] [Advantages of the Cooling Face Mask of the First Embodiment]

[0174] As described above, the cooling mask 1 of the first embodiment includes a mask body 2 that covers at least a portion of the wearer's face and a cooling body 20 disposed on the mask body 2. The mask body 2 is configured to form an internal space 4 between itself and the wearer's face when worn. The cooling body 20 includes a water-retaining layer 24, a first sheet 26, and a second sheet 28 disposed opposite to the first sheet 26 with the water-retaining layer 24 in between. It is disposed on the mask body 2 such that at least a portion of it is in direct or indirect contact with the wearer's face when worn. At least one of the first sheet 26 and the second sheet 28 is made of a non-breathable or difficult-to-breath sheet material.

[0175] Moreover, according to the cooling mask 1 with such a configuration, as described above, the wearer can experience a cooling sensation for a long time through the synergistic effect of heat conduction from the wearer's face to the cooling body 20, the heat of vaporization caused by the evaporation of water in the cooling body 20, and the heat conduction from the cooling body 20 to the outside atmosphere.

[0176] Furthermore, by making at least one of the first sheet 26 and the second sheet 28 of the cooling body 20 a non-permeable or poorly permeable sheet, the direction and amount of moisture evaporation from the water-retaining layer 24 can be controlled. This improves the sustainability of the steam released from the cooling body 20, allowing the cooling effect provided by the cooling body 20 to be maintained for a longer period.

[0177] In particular, when the cooling body 20 is arranged in the mask body 2 such that the area of ​​the cooling body 20 that comes into direct or indirect contact with the wearer's face when worn is more than 10% of the surface area of ​​the side of the cooling body 20 opposite to the wearer's face, a cooling sensation can be further provided to the wearer.

[0178] Furthermore, when the area occupied by the cooling body 20 is more than 40% and less than 80% of the total area of ​​the wearer side of the mask body 2, the cooling sensation imparted to the wearer is more significant.

[0179] Furthermore, when the other of the first sheet 26 and the second sheet 28 is made of a breathable sheet, it can promote the generation of vapor and enhance the cooling effect on the face through the accompanying heat of vaporization or heat dissipation. Moreover, this advantage is particularly significant when the breathable sheet has a breathability of 350 seconds / 100mL or less.

[0180] Furthermore, the initial water content in the water-retaining layer 24 of the cooling body 20 is an average of 1 cm 2 With a volume of 0.40 ml or less, the cooling effect of the cooling mask 1 during the initial wearing stage can be improved, and the persistence of the vapor released from the cooling body 20 can be enhanced, enabling the cooling effect of the cooling body 20 to be maintained for a longer period of time. Furthermore, the weight of the cooling body 20 can be reduced, preventing the cooling mask 1 from shifting and slipping off relative to the face. In particular, when the water-retaining layer 24 contains a water-absorbing polymer, the persistence of the vapor released from the cooling body 20 is especially significant.

[0181] Furthermore, under the test environment conditions of 30°C and 40% RH, when the 10-hour average relative humidity of the internal space 4 is below 90%, the humidity of the internal space 4 can be suppressed for a long time, maintaining a comfortable environment inside the mask. In addition, under the test environment conditions of 30°C and 40% RH, when the 10-hour average temperature of the part of the cooling body 20 that is in direct or indirect contact with the wearer's face is below 29.5°C, the wearer's face can be cooled for a long time.

[0182] [Second Implementation]

[0183] Next, use Figures 12-17 The mask 1' of the second embodiment of the present invention will be described below.

[0184] [The overall structure of the face mask]

[0185] like Figure 12 As shown, the mask 1' of the second embodiment includes: a mask body 2' that can cover at least a portion of the wearer (mouth and nose in this embodiment), and a mask cooling sheet 50 used with the mask body 2', and is configured to function as a so-called cooling mask (hereinafter referred to as "cooling mask 1'") by combining the mask body 2' with the mask cooling sheet 50.

[0186] [Main body of the mask]

[0187] like Figure 12 As shown, the mask body 2' includes: a main body 10' having a size capable of covering at least a portion of the wearer (mouth and nose in this embodiment); and one or more ear loops 30' for holding the main body 10' in front of the wearer's face. The mask body 2' is configured such that, when held in front of the wearer's face via the ear loops 30', it can accommodate a cooling sheet 50 for the mask within the internal space formed between the main body 10' and the wearer's face. The mask body 2' is not limited to... Figure 12 The pleated mask shown can also be a foldable three-dimensional mask such as the mask body 2 of the first embodiment, or a pre-shaped three-dimensional mask, or various other masks.

[0188] [Cooling sheet for face mask]

[0189] The cooling sheet 50 for the face mask includes a water-retaining layer 24, configured such that, when positioned between the face mask body 2' and the wearer, at least a portion of the water-retaining layer 24 directly or indirectly contacts the wearer's face. Hereinafter, the cooling sheet 50 for the face mask will be described using an example of a configuration where one or more cooling elements 20' are sandwiched between the inner surface sheet 14' and the outer surface sheet 16' (so-called internal sheet type), but it is not limited to this. For example, one or more cooling elements 20' can be used directly as the cooling sheet 50 for the face mask. That is, the term "cooling sheet for the face mask" in this specification includes not only configurations combining one or more cooling elements 20' with the inner surface sheet 14' and the outer surface sheet 16', but also configurations where the cooling element 20' is a single unit. Furthermore, when using a single cooling element as the cooling sheet for the face mask, the size of the cooling element can be arbitrarily changed. For example, a cooling body 20' of the size shown in the figure can be used directly, or the cooling body 20' can be enlarged proportionally to the same extent as the cooling sheet 50 for the face mask shown in the figure.

[0190] In this embodiment, such as Figure 13 As shown, the cooling sheet 50 for the face mask is formed in a sheet shape, having the size and shape to be housed within the main body portion 10' of the face mask body 2', and is configured as an internal sheet for use as a container between the face mask body 2' and the wearer's face. The cooling sheet 50 for the face mask is formed from a single sheet. The single sheet forming the cooling sheet 50 for the face mask can be a single structure (single-layer structure) or a multi-layer structure consisting of multiple sheets stacked together. The sheet-like member forming the cooling sheet 50 for the face mask can impart various functions to the cooling sheet 50 for the face mask by assigning different functions to the multiple sheets, and therefore a multi-layer structure is preferred. When using multiple sheets, the sheets can be embossed or laminated, or they can be joined together entirely but separated from each other. In the case where the sheets are separated, the joining of the sheets can be done by joining the edges of the sheets along the shape of the cooling sheet 50 for the face mask, or only joining a portion of the edges. In addition, regarding the joining method, the following methods can be used.

[0191] In the following description of this embodiment, it is explained that the cooling sheet 50 for the face mask is formed from a single sheet with a multi-layered structure. Specifically, as... Figure 14As shown, the cooling sheet 50 for the face mask includes: an inner surface sheet 14', which forms a surface facing the wearer when disposed between the face mask body 2' and the wearer; and an outer surface sheet 16', which forms a surface facing the face mask body 2' when disposed between the face mask body 2' and the wearer. The inner surface sheet 14' and the outer surface sheet 16' are formed with the same shape and size, and are a single sheet with a multi-layer structure obtained by stacking these inner surface sheets 14' and outer surface sheets 16'. In the illustrated example, the cooling sheet 50 for the face mask has a generally rectangular shape including the short side and the long side, but the shape of the cooling sheet 50 for the face mask is not limited to this. Various arbitrary shapes can be adopted as long as at least a portion of the cooling body 20' described later comes into direct or indirect contact with the wearer's face when disposed between the face mask body 2' and the wearer. In addition, the cooling sheet 50 for the face mask is not limited to the planar shape shown, and may also be three-dimensional from the viewpoint of easy breathing. In addition, when the cooling sheet 50 for the mask is set to a three-dimensional shape, it can be configured to deform from a folded state into a three-dimensional shape, or it can be pre-shaped.

[0192] In the cooling sheet 50 for face masks of this embodiment, a cooling body 20' is disposed between the inner surface sheet 14' and the outer surface sheet 16'. That is, when both the inner surface sheet 14' and the outer surface sheet 16' are composed of a single layer or multiple layers of nonwoven fabric as described below, the cooling body 20' is sandwiched between two or more pieces of nonwoven fabric. However, it is not limited to this. It can be configured to have a pocket-shaped storage part provided on the inner surface of the cooling sheet 50 for face masks, and the cooling body 20' can be installed and removed from the storage part. It can also be configured to fix the cooling body 20' to the inner surface of the cooling sheet 50 for face masks using fixing methods such as adhesive, sewing, or heat fusion. In addition, it can also be configured to form an opening and storage space between the outer surface sheet 16' and the inner surface sheet 14' by partially making the outer surface sheet 16' and the inner surface sheet 14' non-adhesive, thereby allowing the cooling body 20' to be inserted and removed. Furthermore, the cooling sheet 50 for the face mask can also be configured to be used without a storage part, and can be directly disposed between the face mask body 2' and the wearer's skin without being fixed. Alternatively, the outer surface sheet 16' and the inner surface sheet 14' can be omitted, and the cooling body 20' can be used as a separate cooling sheet for the face mask, directly disposed between the face mask body 2' and the wearer.

[0193] In this embodiment, an adhesive (not shown) is applied to the outer surface sheet 16', and the cooling body 20' and the inner surface sheet 14' are bonded together via this adhesive. A hot-melt adhesive is preferred as the adhesive, but it is not limited to this, and various known fixing methods can be used. Alternatively, when fixing the cooling body 20', the structure of applying adhesive to the outer surface sheet 16' can be replaced, or a structure of applying adhesive to the inner surface sheet 14' can be used. Furthermore, as described above, the cooling body 20' can also be directly sandwiched between the mask body 2' and the wearer's skin. In this case, the cooling body 20' may or may not be fixed relative to the mask body 2'.

[0194] The material and various properties of the inner surface sheet 14' of the cooling sheet 50 for the face mask can be the same as those of the inner surface sheet 14 of the face mask body 2 in the first embodiment, so a detailed description thereof is omitted. Similarly, the material and various properties of the outer surface sheet 16' of the cooling sheet 50 for the face mask can also be the same as those of the outer surface sheet 16 of the face mask body 2 in the first embodiment, so a detailed description thereof is omitted.

[0195] [cooling body]

[0196] The cooling body 20' of the cooling sheet 50 for the face mask can be the same as the cooling body 20 of the first embodiment. That is, the cooling body 20' is the same as the cooling body 20 of the first embodiment, and includes a water-retaining layer 24, a first sheet 26, and a second sheet 28 arranged opposite to the first sheet 26 with the water-retaining layer 24 in between.

[0197] At least one of the first sheet 26 and the second sheet 28 of the cooling body 20' is the same as that of the first sheet 26 and the second sheet 28 of the cooling body 20 of the first embodiment, and can be a non-permeable sheet (permeability of 80,000 seconds / 100 mL or more) or a poorly permeable sheet (permeability of 30,000 seconds / 100 mL or more). Alternatively, the other of the first sheet 26 and the second sheet 28 can be a permeable sheet. Furthermore, other configurations of the first sheet 26 and the second sheet 28 of the cooling body 20' can be the same as those of the first sheet 26 and the second sheet 28 of the cooling body 20 of the first embodiment, and therefore detailed descriptions are omitted.

[0198] The cooling body 20' with the above configuration is configured such that, with the mask cooling sheet 50 disposed between the mask body 2' and the wearer, at least a portion of the water-retaining layer 24 of the cooling body 20' is in direct or indirect contact with the wearer's face. In this embodiment, the cooling body 20' is disposed between the inner surface sheet 14' and the outer surface sheet 16' of the mask cooling sheet 50, so that when worn, the water-retaining layer 24 of the cooling body 20' is indirectly in contact with the wearer's face through the inner surface sheet 14'. However, it is not limited to this. It can be configured such that the cooling body 20' is stored in a pocket-shaped storage portion provided on the inner surface of the mask cooling sheet 50, so that the water-retaining layer 24 of the cooling body 20' is indirectly in contact with the wearer's face through the storage portion. It can also be configured such that the cooling body 20' is fixed to the inner surface of the mask cooling sheet 50 by an adhesive or the like, so that the water-retaining layer 24 of the cooling body 20' is in direct contact with the wearer's face. Alternatively, other components may be sandwiched between the wearer's face and the cooling body 20' in areas where heat cannot be conducted.

[0199] Similar to the cooling body 20 of the first embodiment, the area (contact range) in which the cooling body 20' directly or indirectly (e.g., in contact with the wearer's face through a sheet) contacts the wearer's face is preferably 10% or more, more preferably 20% or more, and even more preferably 30% or more. Furthermore, it is preferably 100% or less, more preferably 80% or less, and even more preferably 50% or less. The method for measuring the contact area of ​​the cooling body 20 is the same as that for the cooling body 20 of the first embodiment, therefore its detailed description is omitted.

[0200] like Figure 13As shown, the cooling bodies 20' are arranged symmetrically on the left and right, with the center (longitudinal center line 100') along the long side of the mask cooling sheet 50 as the boundary. In the illustrated example, one cooling body 20' is provided on each side, with the longitudinal center line 100' as the boundary, for a total of two cooling bodies 20'. Each cooling body 20' is arranged at a predetermined distance from the longitudinal center line 100', so that it mainly contacts the wearer's cheek directly or indirectly when the mask body 2' is positioned between the mask cooling sheet 50 and the wearer. In addition, the distance from the longitudinal center line 100' to the end of each cooling body 20' can be set to the same distance D1 as described in detail in the first embodiment, and the distance from the end of the mask cooling sheet 50 to the end of each cooling body 20' can be set to the same distance D2 as described in detail in the first embodiment. Furthermore, the distance from the end of the cooling sheet 50 to the end of each cooling element 20' (distance D2) is preferably 50% or less, more preferably 40% or less, and even more preferably 30% or less, the same as the distance D2 described in detail in the first embodiment. It is also preferably 10% or more, more preferably 15% or more, and even more preferably 20% or more. Furthermore, the proportion of the total area of ​​all cooling elements 20' provided on the cooling sheet 50 can be set to the same proportion as the proportion of the total area occupied by the cooling elements 20 relative to the area of ​​the entire surface of the face mask body 2 on the wearer side, as described in detail in the first embodiment.

[0201] The planar shape of the cooling body 20' is the same as that of the cooling body 20 in the first embodiment and is not particularly limited; it may also be circular, polygonal, etc. From the viewpoints of manufacturing efficiency, ease of use, and cooling effect, a rectangular or approximately square quadrilateral shape is preferred, and an approximately square shape is more preferred from the viewpoint of ease of use. In addition, it is preferable, for example, to provide one or two or more cooling bodies 20' in the cooling sheet 50 for the face mask, and preferably to provide one or two or more on both sides with the longitudinal center line 100' as the boundary, but it is not limited thereto. Furthermore, when multiple cooling bodies 20' are provided, the cooling characteristics of the multiple cooling bodies 20' may be the same or different, and it is more preferable that they are the same.

[0202] (10-hour average relative humidity and 10-hour average temperature)

[0203] According to the cooling sheet 50 for the mask having the above-mentioned structure and water vapor generation performance, similar to the cooling mask 1 of the first embodiment, the humidity of the internal space formed between the mask body 2' and the wearer's face can be suppressed for a long time, and the wearer's face can be cooled for a long time.

[0204] Specifically, the cooling sheet 50 for the face mask, equipped with a cooling body 20', can suppress the 10-hour average relative humidity in the internal space (i.e., the 10-hour average relative humidity in areas not directly or indirectly contacted by the cooling body 20') to below 80%, similar to the cooling face mask 1 of the first embodiment. In the cooling body 20', a breathable sheet is used for the first sheet 26 and oriented towards the face, while a non-breathable or poorly breathable sheet is used for the second sheet 28. Furthermore, the 10-hour average temperature at the portion of the cooling body 20' that directly or indirectly contacts the wearer's face can be suppressed to below 29°C. More specifically, the 10-hour average relative humidity of the cooling sheet 50 for the face mask in this case is more preferably below 90%, and even more preferably below 80%. Additionally, the 10-hour average temperature of the cooling sheet 50 for the face mask in this case is more preferably below 29.5°C, and even more preferably below 29.0°C. Furthermore, the methods for measuring temperature and relative humidity are the same as those described in the first embodiment, so detailed descriptions are omitted.

[0205] Furthermore, the cooling sheet 50 for the face mask, equipped with the cooling body 20', can suppress the 10-hour average relative humidity in the internal space to below 50%, similar to the cooling face mask 1 of the first embodiment. In the cooling body 20', the first sheet 26 is made of a non-breathable or poorly breathable material oriented towards the face, and the second sheet 28 is made of a breathable material. Additionally, the 10-hour average temperature at the portion of the cooling body 20' that directly or indirectly contacts the wearer's face can be suppressed to below 28.0°C. More specifically, the 10-hour average relative humidity of the cooling sheet 50 for the face mask in this case is more preferably below 60%, and even more preferably below 50%. Furthermore, the 10-hour average temperature of the cooling sheet 50 for the face mask in this case is more preferably below 28.5°C, and even more preferably below 27.5°C.

[0206] How to use a cooling face mask (cooling sheet for face masks)

[0207] Next, the usage methods of the cooling face mask 1 of the first embodiment and the cooling face mask 1' of the second embodiment will be described.

[0208] The cooling mask 1 of the first embodiment and the cooling mask 1' of the second embodiment are cooling devices with packaging bags, which at least preserve the cooling bodies 20 and 20' in a state of being sealed in waterproof packaging bags 200 and 200'. In the first embodiment, the cooling body 20 is integrated with the mask body 2, therefore, as Figure 8As shown, the cooling face mask 1 is stored in a packaging bag 200 with the entire mask sealed inside. In this stored state, the face mask body 2 can be folded around its longitudinal center line with the holding part 30 folded inward, or it can remain folded. On the other hand, in the second embodiment, as... Figure 15 As shown, the face mask cooling sheet 50 can be stored in a packaging bag 200' only. In this storage state, the face mask cooling sheet 50 can be folded around its longitudinal centerline or left folded. In the second embodiment, the face mask body 2' does not need to be sealed in the waterproof packaging bag 200', but can be sealed together with the face mask cooling sheet 50. Alternatively, it is also possible to only seal the cooling bodies 20 and 20' into the packaging bags 200 and 200'.

[0209] When using the cooling face mask 1 according to the first embodiment, firstly, the wearer opens the packaging bag 200, takes out the cooling face mask 1, opens the folded face mask body 2 from the face-contact end 5, and takes out a pair of retaining parts 30 from the inside of the face mask body 2. Then, as... Figure 9 As shown in (a), with the mask body 2 in contact with the mouth and nose, the retaining part 30 is stretched with fingers, and the ears are inserted into the ear loops 32. In this way, the pair of retaining parts 30 are hooked onto the wearer's left and right ears, as shown. Figure 9 As shown in (b), the mask body 2 can be kept on the wearer's face in a way that keeps the wearer's mouth and nose covered.

[0210] On the other hand, when using the cooling mask 1' of the second embodiment, the wearer opens the packaging bag 200', takes out the cooling sheet 50 (or cooling body 20') for the mask, and... Figure 16 As shown, with a cooling sheet 50 (or cooling body 20') for the mask provided on the inner surface of the new mask body 2' or the already worn mask body 2', as... Figure 17 As shown, the mask body 2' is worn on the wearer's face. At this time, from the viewpoint of fit, it is preferable that the outer surface sheet 16' of the mask cooling sheet 50 (or the first sheet 26 or the second sheet 28 of the cooling body 20') overlaps the inner surface of the mask body 2', and that the longitudinal center line 100' of the mask cooling sheet 50 is aligned with the center of the width direction of the mask body 2', but it is not limited to this.

[0211] Furthermore, when the mouth and nose are covered by the mask bodies 2 and 2', at least a portion of the water-retaining layer 24 of the cooling bodies 20 and 20' comes into contact with the wearer's face, thereby conducting heat from the wearer's face to the cooling bodies 20 and 20', cooling the wearer's face. Additionally, the heat from the wearer's face heats the cooling bodies 20 and 20', causing the water held in the cooling bodies 20 and 20' to evaporate, thus generating heat of vaporization. As a result, the heat from the cooling bodies 20 and 20' is continuously dissipated outside the cooling bodies 20 and 20', further cooling the wearer's face. Furthermore, through heat conduction from the cooling bodies 20 and 20' to the external atmosphere, the heat from the cooling bodies 20 and 20' is dissipated outside the cooling bodies 20 and 20'. Utilizing this cooling mechanism, the cooling masks 1 and 1' according to the first and second embodiments can provide a cooling sensation to the wearer for a prolonged period.

[0212] Furthermore, the packaging bags 200 and 200' that enclose the cooling mask 1 or the cooling sheet 50 (or cooling body 20') are preferably bags with water vapor barrier properties (such as non-permeable packaging materials), but are not limited thereto. In addition, in the first and second embodiments, the entire cooling mask 1 or the entire cooling sheet 50 is enclosed in the packaging bag 200', but is not limited thereto. When the cooling bodies 20 and 20' are not integrated with the mask body 2 or the cooling sheet 50 (as can be attached later), the mask body 2 or the cooling sheet 50 can be packaged separately from the cooling bodies 20 and 20', or only the cooling bodies 20 and 20' can be packaged.

[0213] [Advantages of the Cooling Sheet for the Face Mask in the Second Embodiment]

[0214] As explained above, the cooling sheet 50 for the face mask in the second embodiment is a cooling sheet 50 for the face mask that is used with the face mask body 2' that covers at least a portion of the wearer's face. It has a water-retaining layer 24 and is configured such that, when disposed between the face mask body 2' and the wearer, at least a portion of the water-retaining layer 24 is in direct or indirect contact with the wearer's face.

[0215] Furthermore, according to the cooling sheet 50 of the mask having such a configuration, similar to the cooling mask 1 of the first embodiment, the mask can provide a cooling sensation to the wearer for a long time through the synergistic effect of heat conduction from the wearer's face to the cooling body 20', the heat of vaporization caused by the evaporation of water in the cooling body 20', and the heat conduction from the cooling body 20' to the outside atmosphere.

[0216] In addition, by making at least one of the first sheet 26 and the second sheet 28 of the cooling body 20' a non-breathable or difficult-to-breath sheet, the direction and amount of water evaporation of the water-retaining layer 24 can be controlled, just like the cooling mask 1 of the first embodiment. Therefore, the continuity of the steam released from the cooling body 20' can be improved, and the cooling effect of the cooling body 20' can be maintained for a long time.

[0217] [Variation Example]

[0218] The preferred embodiments of the present invention have been described above, but the technical scope of the present invention is not limited to the scope described in the above embodiments. Various modifications or improvements can be made to the above embodiments.

[0219] For example, in the first and second embodiments described above, a cooling mask that can cover the mouth and nose is described, but it is not limited thereto; it is sufficient as long as it can cover at least a portion of the wearer's face.

[0220] In the first embodiment described above, the mask body 2 is described as having a first sheet portion 10A and a second sheet portion 10B, and is configured to deform from a folded state into a three-dimensional shape. However, it is not limited to this, and it can also be pre-shaped. In addition, the mask body 2 is not limited to a three-dimensional shape, and can also be a planar mask body such as a pleated mask.

[0221] As can be seen from the claims, the variations described above are included within the scope of this invention.

[0222] Regarding the above embodiments, the present invention further discloses the following face mask and cooling sheet for face mask.

[0223] <1>

[0224] A face mask comprising: a face mask body covering at least a portion of the wearer's face; and a cooling body disposed on the face mask body;

[0225] The main body of the aforementioned mask is configured to create an internal space between itself and the wearer's face when worn;

[0226] The cooling body comprises: a water-retaining layer, a first sheet, and a second sheet disposed opposite to the first sheet with the water-retaining layer in between, and disposed on the main body of the mask such that at least a portion thereof comes into direct or indirect contact with the wearer's face when worn.

[0227] At least one of the aforementioned first sheet and the aforementioned second sheet is composed of a non-breathable sheet or a sheet that is difficult to breathe.

[0228] <2>

[0229] The face mask described in <1> above, wherein,

[0230] The air permeability of the aforementioned non-breathable or poorly breathable sheets is preferably 50,000 seconds / 100mL or more, and more preferably 80,000 seconds / 100mL or more.

[0231] <3>

[0232] The face mask as described in <1> or <2> above, wherein,

[0233] When the aforementioned cooling body is worn, the area in direct or indirect contact with the wearer's face is more than 10% of the surface area of ​​the side of the cooling body opposite to the wearer's face.

[0234] <4>

[0235] The face mask described in <3> above, wherein...

[0236] Of the surface area of ​​the cooling body on the side opposite to the wearer's face, the proportion of the area that directly or indirectly contacts the wearer's face (contact area) is preferably 10% or more, more preferably 20% or more, even more preferably 30% or more, and preferably 100% or less, more preferably 80% or less, and even more preferably 50% or less.

[0237] <5>

[0238] The face mask as described in any one of <1> to <4> above, wherein,

[0239] The aforementioned cooling elements are arranged symmetrically on the first and second sections of the mask body, with the longitudinal center line of the mask body as the dividing line.

[0240] <6>

[0241] The face mask as described in any one of <1> to <5> above, wherein,

[0242] The cooling body is preferably configured such that the distance D1 between the longitudinal centerline of the mask body and the end of the cooling body on the longitudinal centerline side is 5 mm or more, and more preferably such that it is 10 mm or more.

[0243] <7>

[0244] The face mask as described in any one of <1> to <6> above, wherein,

[0245] The cooling body is preferably configured such that the distance D2 between the end of the cooling body on the face-contact side and the end of the face-contact side of the mask body is 28 mm or less, and more preferably such that it is 23 mm or less.

[0246] <8>

[0247] The face mask described in <7> above, wherein...

[0248] The aforementioned distance D2 is preferably 50% or less of the width D3 of each piece of the mask body, more preferably 40% or less, even more preferably 30% or less, and preferably 10% or more, more preferably 15% or more, and even more preferably 20% or more.

[0249] <9>

[0250] The face mask as described in any one of <1> to <8> above, wherein,

[0251] The area occupied by the cooling body is more than 40% and less than 80% relative to the area of ​​the entire surface of the wearer side of the main body of the mask.

[0252] <10>

[0253] The face mask described in <9> above, wherein...

[0254] The proportion of the total area occupied by the cooling body relative to the area of ​​the entire surface on the wearer side of the mask body is preferably 40% or more, more preferably 42% or more, and preferably 80% or less, more preferably 65% ​​or less.

[0255] <11>

[0256] The face mask as described in any one of <1> to <10> above, wherein,

[0257] The other of the first sheet and the second sheet mentioned above includes a breathable sheet having a breathability of less than 350 seconds / 100mL.

[0258] <12>

[0259] The face mask described in <11> above, wherein,

[0260] The air permeability of the above-mentioned breathable sheet is preferably less than 350 seconds / 100mL, and more preferably less than 100 seconds / 100mL.

[0261] <13>

[0262] The face mask as described in any one of <1> to <12> above, wherein,

[0263] Under the experimental conditions of 30°C and 40% RH, the 10-hour average relative humidity of the above-mentioned interior space was less than 90%.

[0264] <14>

[0265] The face mask as described in any one of <1> to <13> above, wherein,

[0266] Under the test conditions of 30°C and 40%RH, the average temperature of the part of the above-mentioned cooling body that comes into direct or indirect contact with the wearer's face over 10 hours is below 29.5°C.

[0267] <15>

[0268] The face mask as described in <11> or <12> above, wherein,

[0269] The aforementioned cooling body uses a breathable sheet on the face side and a non-breathable or poorly breathable sheet on the non-face side.

[0270] <16>

[0271] The face mask described in <15> above, wherein,

[0272] The cooling body, which is made by using a breathable sheet for the first sheet and oriented towards the face, and using a non-breathable or difficult-to-breath sheet for the second sheet, has a 10-hour average relative humidity in the internal space of the mask (i.e., the 10-hour average relative humidity in the area where the cooling body is not in direct or indirect contact) that is more preferably less than 90%, and even more preferably less than 80%.

[0273] <17>

[0274] The face mask described in <15> or <16> above includes a cooling body made by using a breathable sheet for the first sheet and oriented towards the face, and using a non-breathable or poorly breathable sheet for the second sheet. The average temperature of the cooling body at the part that directly or indirectly contacts the wearer's face over 10 hours is more preferably 29.5°C or less, and even more preferably 29.0°C or less.

[0275] <18>

[0276] The face mask as described in <11> or <12> above, wherein,

[0277] In the aforementioned cooling body, a non-breathable or poorly breathable sheet is used on the face side, while a breathable sheet is used on the non-face side.

[0278] <19>

[0279] The face mask described in <18> above, wherein the cooling body comprises a non-breathable or difficult-to-breathable sheet for the first sheet and oriented on the face side, and a breathable sheet for the second sheet, wherein the average relative humidity in the internal space of the face mask over 10 hours is more preferably less than 60%, and even more preferably less than 50%.

[0280] <20>

[0281] The face mask described in <18> or <19> above includes a cooling body that uses a non-breathable or poorly breathable sheet for the first sheet and is oriented towards the face, and uses a breathable sheet for the second sheet. The average temperature over 10 hours at the part of the cooling body that directly or indirectly contacts the wearer's face is more preferably 28.5°C or less, and even more preferably 27.5°C or less.

[0282] <21>

[0283] The face mask as described in any one of <1> to <20> above, wherein,

[0284] The initial water content of the above-mentioned water-retaining layer is an average of 1 cm 2 The dosage is less than 0.40ml.

[0285] <22>

[0286] The face mask described in <21> above, wherein,

[0287] The initial water content retained in the aforementioned water-retaining layer (i.e., the water content immediately after opening the packaging bag such as the oxygen barrier bag) is preferably an average of 1 cm. 2 The concentration is 0.04 ml or more, more preferably an average of 1 cm. 2 The concentration is 0.08 ml or more, and more preferably an average of 1 cm. 2 The concentration is 0.10 ml or more; additionally, it is preferred to have an average concentration of 1 cm. 2 Less than 0.40 ml, more preferably an average of 1 cm 2 The concentration is less than 0.30 ml, and more preferably an average of 1 cm. 2 It is less than 0.25ml.

[0288] <23>

[0289] The face mask as described in any one of <1> to <22> above, wherein,

[0290] The initial water content in the aforementioned water-retaining layer is preferably 1% or more by mass of the maximum water absorption capacity of the water-retaining layer, more preferably 2% or more by mass, even more preferably 3% or more by mass, and even more preferably 4% or more by mass. In addition, it is preferably 20% or less by mass, more preferably 15% or less by mass, even more preferably 10% or less by mass, and even more preferably 7% or less by mass.

[0291] <24>

[0292] A cooling sheet for a face mask, used in conjunction with a face mask body covering at least a portion of the wearer's face, and having a water-retaining layer.

[0293] The cooling sheet for the face mask is configured such that, when disposed between the face mask body and the wearer, at least a portion of the water-retaining layer is in direct or indirect contact with the wearer's face.

[0294] <25>

[0295] The cooling sheet for the face mask described in <24> above further comprises: a first sheet, and a second sheet disposed opposite to the first sheet with the aforementioned water-retaining layer in between.

[0296] At least one of the aforementioned first sheet and the aforementioned second sheet is composed of a non-breathable sheet or a sheet that is difficult to breathe.

[0297] <26>

[0298] As described in <25> above, the cooling sheet for the face mask, wherein...

[0299] The air permeability of the aforementioned non-breathable or poorly breathable sheets is preferably 50,000 seconds / 100mL or more, and more preferably 80,000 seconds / 100mL or more.

[0300] <27>

[0301] The cooling sheet for a face mask as described in any one of <24> to <26> above includes a cooling body having the aforementioned water-retaining layer.

[0302] The cooling body described above is preferably in contact with the wearer's face directly or indirectly for a range of 10% or more, more preferably 20% or more, even more preferably 30% or more, and preferably 100% or less, more preferably 80% or less, and even more preferably 50% or less.

[0303] <28>

[0304] The cooling sheet for the face mask as described in any one of <24> to <27> above, wherein,

[0305] The aforementioned cooling elements are arranged symmetrically on the left and right, with the center (longitudinal center line) of the long side of the aforementioned cooling sheet for the face mask as the dividing line.

[0306] <29>

[0307] The cooling sheet for the face mask as described in any one of <24> to <28> above, wherein,

[0308] The cooling body is preferably arranged such that the distance from the longitudinal center line of the cooling sheet for the face mask to the end of the cooling body is 5 mm or more, and more preferably such that the distance is 10 mm or more.

[0309] <30>

[0310] The cooling sheet for the face mask as described in any one of <24> to <29> above, wherein,

[0311] The cooling body is preferably configured such that the distance from the end of the cooling sheet for the face mask to the end of the cooling body is 28 mm or less, and more preferably such that the distance is 23 mm or less.

[0312] <31>

[0313] As described in <30> above, the cooling sheet for the face mask, wherein...

[0314] The distance (distance D2) from the end of the cooling sheet for the face mask to the end of the cooling body is preferably 50% or less of the distance (distance D3) from the longitudinal center line of the cooling sheet for the face mask to the end. More preferably, it is 40% or less. Even more preferably, it is 30% or less. In addition, it is preferably 10% or more, more preferably 15% or more, and even more preferably 20% or more.

[0315] <32>

[0316] The cooling sheet for the face mask as described in any one of <24> to <31> above, wherein,

[0317] The proportion of the total area occupied by the cooling body relative to the area of ​​the entire wearer side of the aforementioned cooling sheet for the face mask is preferably 40% or more, more preferably 42% or more, and preferably 80% or less, more preferably 65% ​​or less.

[0318] <33>

[0319] The cooling sheet for the face mask as described in any one of <24> to <32> above, wherein,

[0320] The first sheet and the other of the second sheet are both made of a breathable sheet having a breathability of less than 350 seconds / 100mL.

[0321] <34>

[0322] As described in <33> above, the cooling sheet for the face mask, wherein...

[0323] The air permeability of the above-mentioned breathable sheet is preferably less than 350 seconds / 100mL, and more preferably less than 100 seconds / 100mL.

[0324] <35>

[0325] The cooling sheet for the face mask as described in any one of <24> to <34> above, wherein,

[0326] Under the experimental conditions of 30°C and 40% RH, the average relative humidity in the internal space formed between the mask body and the wearer's face was less than 90% over 10 hours.

[0327] <36>

[0328] The cooling sheet for the face mask as described in any one of <24> to <35> above, wherein,

[0329] Under the experimental conditions of 30°C and 40%RH, the average temperature of the part of the cooling body that comes into direct or indirect contact with the wearer's face over 10 hours is below 29.5°C.

[0330] <37>

[0331] As described in <33> or <34> above, the cooling sheet for the face mask, wherein,

[0332] The aforementioned cooling body uses a breathable sheet on the face side and a non-breathable or poorly breathable sheet on the non-face side.

[0333] <38>

[0334] The cooling sheet for the face mask described in <37> above comprises a cooling body obtained by using a breathable sheet for the first sheet and oriented it towards the face side, and using a non-breathable or difficult-to-breath sheet for the second sheet, and the 10-hour average relative humidity in the internal space (i.e., the 10-hour average relative humidity in the area where the cooling body is not in direct or indirect contact) is more preferably less than 90%, and even more preferably less than 80%.

[0335] <39>

[0336] The cooling sheet for the face mask as described in <37> or <38> above comprises a cooling body obtained by using a breathable sheet for the first sheet and oriented towards the face side, and using a non-breathable or difficult-to-breath sheet for the second sheet, wherein the average temperature of the part of the cooling body that directly or indirectly contacts the wearer's face over 10 hours is more preferably 29.5°C or less, and even more preferably 29.0°C or less.

[0337] <40>

[0338] As described in <33> or <34> above, the cooling sheet for the face mask, wherein,

[0339] The aforementioned cooling body uses a non-breathable or poorly breathable sheet on the face side and a breathable sheet on the non-face side.

[0340] <41>

[0341] The cooling sheet for the face mask described in <40> above comprises a cooling body obtained by using a non-breathable or difficult-to-breathable sheet for the first sheet and oriented it on the face side, and using a breathable sheet for the second sheet, and the average relative humidity of the internal space over 10 hours is more preferably less than 60%, and even more preferably less than 50%.

[0342] <42>

[0343] The cooling sheet for the face mask as described in <40> or <41> above comprises a cooling body obtained by using a non-breathable or difficult-to-breathable sheet for the first sheet and oriented it towards the face side, and using a breathable sheet for the second sheet, wherein the average temperature of the cooling body at the part that directly or indirectly contacts the wearer's face over 10 hours is more preferably 28.5°C or less, and even more preferably 27.5°C or less.

[0344] <43>

[0345] The cooling sheet for the face mask as described in any one of <24> to <42> above, wherein,

[0346] The initial water content of the above-mentioned water-retaining layer is an average of 1 cm 2 The dosage is less than 0.40ml.

[0347] <44>

[0348] As described in <43> above, the cooling sheet for the face mask, wherein...

[0349] The initial water content retained in the aforementioned water-retaining layer (i.e., the water content immediately after opening the packaging bag such as the oxygen barrier bag) is preferably an average of 1 cm. 2 The concentration is 0.04 ml or more, more preferably an average of 1 cm. 2 The concentration is 0.08 ml or more, and more preferably an average of 1 cm. 2 The concentration is 0.10 ml or more; additionally, it is preferred to have an average concentration of 1 cm. 2 Less than 0.40 ml, more preferably an average of 1 cm 2 The concentration is less than 0.30 ml, and more preferably an average of 1 cm. 2 It is less than 0.25ml.

[0350] <45>

[0351] The cooling sheet for the face mask as described in any one of <24> to <44> above, wherein,

[0352] The initial water content in the aforementioned water-retaining layer is preferably 1% or more by mass of the maximum water absorption capacity of the water-retaining layer, more preferably 2% or more by mass, even more preferably 3% or more by mass, and even more preferably 4% or more by mass. In addition, it is preferably 20% or less by mass, more preferably 15% or less by mass, even more preferably 10% or less by mass, and even more preferably 7% or less by mass.

Claims

1. A face mask, wherein, The face mask comprises: a face mask body that covers at least a portion of the wearer's face; and A cooling element is disposed on the main body of the mask. The main body of the mask is configured to create an internal space between itself and the wearer's face when worn. The cooling body comprises: a water-retaining layer, a first sheet, and a second sheet disposed opposite to the first sheet through the water-retaining layer, and disposed on the mask body such that at least a portion thereof directly or indirectly contacts the wearer's face when worn. The first sheet is positioned on the side of the wearer's face, and the breathability of the first sheet is above 80,000 seconds / 100 mL; The second sheet is positioned on the non-face side of the wearer, and the breathability of the second sheet is less than 350 seconds / 100 mL.

2. The face mask as claimed in claim 1, wherein, When worn, the cooling body comes into direct or indirect contact with the wearer's face by an area of ​​more than 10% of the surface area of ​​the side of the cooling body opposite to the wearer's face.

3. The face mask as claimed in claim 1 or 2, wherein, The area occupied by the cooling body is more than 40% and less than 80% relative to the entire area of ​​the wearer side of the main body of the mask.

4. The face mask as described in any one of claims 1 to 3, wherein, The initial water content of the water-retaining layer is an average of 1 cm. 2 The volume is less than 0.40 ml.

5. The face mask as described in any one of claims 1 to 4, wherein, Under environmental conditions of 30°C and 40%RH, the average temperature of the part of the cooling body that comes into direct or indirect contact with the wearer's face over 10 hours is below 29.5°C.

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