Manufacturing method of the liquid-retaining layer

Abstract

To provide a manufacturing method of a liquid-holding layer allowing a liquid-trapping layer to contain sufficient liquid, a manufacturing method of a cooling body using the liquid holding-layer, and a manufacturing method of a mask using the cooling body.SOLUTION: There is provided a manufacturing method of a liquid-holding layer including: a laminate of a liquid impermeable layer and a liquid-trapping layer disposed on one surface side of the liquid impermeable layer; and a liquid contained in the liquid-trapping layer. The method comprises the step of adding the liquid to the liquid-trapping layer dividedly in a plurality of times.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a method for producing a liquid-retaining layer used in a mask or the like. [Background technology]

[0002] In recent years, the functions of masks that cover the mouth and nose have become more diverse, and various masks have been developed, such as masks with a heating function that provides heat. Masks with a cooling function that have a liquid-retaining layer with a heat-absorbing function are being considered. As the liquid-retaining layer, a liquid-retaining member that contains a liquid containing water as a main component is being considered.

[0003] Patent Document 1 discloses a method for manufacturing a heating device that has a function of imparting heat and other functions such as fragrant release, antibacterial properties, anti-inflammatory properties, etc. The heating device is configured by housing, in a breathable bag, a laminate of a heating element for imparting heat and a liquid-containing sheet in which a liquid-retaining sheet is impregnated with a liquid-containing drug for imparting functions other than imparting heat. In the manufacturing method of the heating device, a medicinal liquid is applied to one side of a liquid retaining sheet, and then the heat generating composition is overlaid so that the one side of the liquid retaining sheet faces the heat generating composition to obtain a laminate precursor, which is then cut into sheets of the laminate precursor, and an aqueous electrolyte solution is applied to the sheets of the laminate precursor to obtain the laminate. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2011-125525 A Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention relates to a mask having a cooling function. The cooling function may be provided with a liquid-retaining layer having a heat absorbing function. The liquid-retaining layer may be a liquid-retaining member impregnated with a liquid containing water as a main component. In order to provide an effective heat absorbing function to the liquid-retaining layer having a liquid-containing liquid retaining layer, it is desirable for the liquid retaining layer to be sufficiently saturated with liquid.

[0006] An object of the present invention is to provide a method for producing a liquid-retaining layer capable of impregnating the liquid retaining layer with a sufficient amount of liquid, a method for producing a cooling body using the liquid-retaining layer, and a method for producing a mask using the cooling body. [Means for solving the problem]

[0007] A method for producing a liquid-retaining layer according to one embodiment of the present invention is a method for producing a liquid-retaining layer including a laminate of a poorly liquid-permeable layer and a liquid-retaining layer arranged on one surface side of the poorly liquid-permeable layer, and a liquid contained in the liquid-retaining layer, the method including a multiple liquid-adding step of adding the liquid to the liquid-retaining layer in multiple batches. Effect of the Invention

[0008] According to the present invention, it is possible to obtain a liquid-retaining layer that contains a sufficient amount of liquid. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of a mask according to an embodiment of the present invention. [Diagram 2] FIG. 2 is an additional view showing the deployed state of the mask body of the above mask. [Diagram 3] FIG. 3 is a schematic cross-sectional view of the mask taken along line III-III in FIG. [Figure 4] 4 is a schematic cross-sectional view of a cooling body of the mask and an adhesive applied to the cooling body. FIG. [Diagram 5] FIG. 1 is a schematic diagram showing a manufacturing method for a liquid-retaining layer and a manufacturing apparatus for a liquid-retaining layer and a cooling body used in manufacturing a cooling body according to a first embodiment of the present invention, as viewed from above. [Figure 6]FIG. 6 is a schematic side view of the manufacturing apparatus of FIG. 5. [Figure 7] 7 is a flow diagram of a method for producing a liquid-retaining layer and a cooling body according to the first embodiment using the production apparatus in FIG. 6. [Figure 8] FIG. 2 is an enlarged view of a main part of the manufacturing apparatus as viewed from above, illustrating the liquid addition positions in each of the first to fourth liquid addition steps. [Figure 9] FIG. 4 is a schematic diagram illustrating the liquid spray width in a first liquid addition step to the liquid retaining layer. [Figure 10] FIG. 11 is a schematic side view of a liquid-retaining layer and cooling body manufacturing apparatus used in a liquid-retaining layer manufacturing method and in manufacturing a cooling body according to a second embodiment of the present invention. [Figure 11] FIG. 2 is a schematic diagram showing a top view of a mask manufacturing apparatus used to manufacture cooling masks using cooling bodies manufactured by the above manufacturing apparatus. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Preferred embodiments for carrying out the present invention will be described below with reference to the drawings. Note that the following embodiments do not limit the inventions according to the claims, and not all of the combinations of features described in the embodiments are necessarily essential to the solution of the invention. The drawings are schematic diagrams in which emphasis, omission, and ratio adjustments have been appropriately made to illustrate the present invention, and may differ from the actual shapes, positional relationships, and ratios.

[0011] First, the configuration of a mask having a liquid-retaining layer manufactured by the manufacturing method of the present invention will be described. The mask is a so-called cooling mask (hereinafter referred to as "cooling mask 1") that has a liquid-retaining layer containing liquid (water in this embodiment) and exhibits a cooling effect due to the heat of vaporization when worn.

[0012] <Overall composition of the cooling mask> As shown in FIG. 1, the cooling mask 1 includes a mask body 2, a holding portion 30, and a cooling body 20. The cool mask 1 is typically folded flat and distributed in a state where it is housed in a packaging material such as an oxygen-blocking bag for individual packaging from the viewpoint of hygiene. When worn, the cool mask 1 is used in a three-dimensional state by widening the opening of the face-contacting end portion 5 described later, as shown in FIG.

[0013] <Mask body configuration> The mask body 2 is configured so as to be able to cover at least a part of the wearer (the mouth and nose in this embodiment). In FIG. 1, the end portion on the open side (the side that contacts the face) of the mask body 2 is referred to as the "face contact end portion 5," and the end portion on the closed side (bottom side) located opposite the face contact end portion 5 is referred to as the "closed side end portion 6." When worn, the edge located on the upper side of the mask body 2 is referred to as the "upper edge 7," and the edge located on the lower side is referred to as the "lower edge 8." When the mask body 2 covers the wearer's mouth and nose, the upper edge 7 is the edge located on the nose side, and the lower edge 8 is the edge located on the chin side. The "wearing" referred to here means a state in which the normal and proper wearing position (the expected wearing position of the cool mask 1) is maintained. In this specification, "face side" or "inside" refers to the side of the cooling mask or its components that faces the wearer's face when worn. "Non-face side" or "outside" refers to the side of the cooling mask or its components that faces away from the wearer's face when worn. In addition, in this specification, "upper," "lower," "right," and "left" refer to "upper," "lower," "right," and "left" as seen by the wearer of the cooling mask when the wearer is facing forward. In addition, in the present specification, the term "planar view" refers to a state in which a thin, flat structure is viewed from the thickness direction.

[0014] As shown in FIGS. 1 to 3, the mask body 2 has a first panel portion 10A and a second panel portion 10B. Before use, the mask body 2 is folded in half along the vertical center line 100 (the closed side end 6) of the first panel portion 10A and the second panel portion 10B, so that the mask body 2 is folded in half into a flat shape. Furthermore, the holding portion 30 can be folded and stored inside the double-folded cool mask 1, making it possible to make the mask compact. On the other hand, when in use, the mask body 2 is opened from the edge (face-contacting end 5) opposite to the vertical center line 100 (occlusion side end 6), and worn so that the inner side of the folded mask body 2 faces the wearer. That is, when worn, the mask body 2 is configured so that the face-contacting end 5 of the first panel portion 10A and the face-contacting end 5 of the second panel portion 10B are pulled away from each other, causing the occlusion side end 6 to protrude forward of the mask body 2 about the vertical center line 100, forming a hollow, shape-retaining three-dimensional shape.

[0015] 1, the first panel portion 10A and the second panel portion 10B form a peripheral surface extending from the face-contacting end portion 5 toward the closed-side end portion 6. The peripheral surface is configured to form an internal space 4 between the face of the wearer and the peripheral surface when the mask is worn. Specifically, the first panel portion 10A forms one half of the circumferential surface of the mask body 2, and the second panel portion 10B forms the remaining half of the circumferential surface. The first panel portion 10A and the second panel portion 10B are configured to be deformable into a three-dimensional shape as shown in FIG. 1 by expanding the opening of the face-contacting end portion 5.

[0016] The first panel portion 10A and the second panel portion 10B are configured to have the same size and shape. The mask body 2 is formed by folding the first panel portion 10A and the second panel portion 10B in half about a vertical center line 100 so that an inner sheet 14 described later faces inside, and then joining the first panel portion 10A and the second panel portion 10B to each other by an upper joint portion 4a formed near an upper edge portion 7 of the vertical center line 100 and a lower joint portion 4b formed on a lower edge portion 8 side of the vertical center line 100. That is, the closed side end portion 6 of the mask body 2 is formed by the vertical center line 100 which is an integral continuous portion of the first panel portion 10A and the second panel portion 10B, the upper joint portion 4a which later joins the upper side (nose side) of the vertical center line 100, and the lower joint portion 4b which later joins the lower side (chin side) of the vertical center line 100. The means for joining the first panel portion 10A and the second panel portion 10B is not particularly limited as long as it is capable of joining the two panel portions 10A, 10B so that they do not separate. For example, any means such as pressure bonding, heat welding, ultrasonic welding, high-frequency welding, and adhesives can be used. In addition, in this embodiment, the first panel portion 10A and the second panel portion 10B are formed as a single unit from the beginning, but instead of this configuration, the first panel portion 10A and the second panel portion 10B may be formed as separate bodies and then mechanically joined together.

[0017] The first panel portion 10A and the second panel portion 10B are sheet-like and, for example, are configured with an integrated multi-layer structure in which two sheets are laminated. More specifically, the first panel portion 10A and the second panel portion 10B of this embodiment include an inner sheet 14 that forms the inner surface when the panel is three-dimensional, and an outer sheet 16 that forms the outer surface when the panel is three-dimensional, as shown in Figs. 1 and 3. The inner sheet 14 and the outer sheet 16 are formed to have the same shape and size.

[0018] As shown in FIG. 3, in the mask body 2, a cooling body 20 is disposed between the inner sheet 14 and the outer sheet 16. In this embodiment, the cooling body 20 is fixed to the inner surface of the outer sheet 16 by an adhesive 33 described below. This makes it possible to prevent the cooling body 20 from falling off from the mask body 2. As the adhesive 33, a hot melt adhesive is typically used, but the adhesive is not limited to this, and various known fixing means can be used.

[0019] The configuration for holding the cooling body 20 is not limited to the above configuration. For example, a pocket-shaped storage section may be provided on the inner surface of the mask body 2, and the cooling body 20 may be held in the storage section, or the cooling body 20 may be fixed to the inner surface of the mask body 2 using a fixing means such as an adhesive. Also, for example, the outer sheet 16 and the inner sheet 14 may be locally non-adhesive to form an opening and storage space between the outer sheet 16 and the inner sheet 14 through which the cooling body 20 can be inserted and removed.

[0020] The materials for the inner sheet 14 and the outer sheet 16 can be any material that has been conventionally used in the technical field of masks that cover the mouth and nose, and are not particularly limited as long as they have a certain level of breathability. For example, nonwoven fabric, woven fabric, fiber sheets such as paper, resin foam sheets, metal sheets, or combinations of these, etc., can be used. Among these, it is preferable to use nonwoven fabric from the viewpoints of ease of processing and economy. The fiber material of the nonwoven fabric is preferably one constituted of one or more types of fiber selected from, for example, polyester, polyolefin, rayon, cotton, and the like. An example of the polyester is polyethylene terephthalate (PET). Examples of polyolefins include PE (polyethylene), PP (polypropylene), and ethylene-propylene copolymers. The nonwoven fabric may be an air-through nonwoven fabric, a spunbond nonwoven fabric, a needle-punched nonwoven fabric, a melt-blown nonwoven fabric, or the like, which uses one or more of the above-mentioned fibers, and may have a single-layer or multi-layer structure. The nonwoven fabric may be chemically treated depending on the purpose.

[0021] The inner sheet 14 is preferably a breathable sheet from the viewpoints of increasing the efficiency of heat transfer from the wearer's face to the cooling body 20 and facilitating the evaporation of water vapor generated from the cooling body 20. On the other hand, the outer sheet 16 may be made of any material depending on the product design, and may be any of a breathable sheet, a poorly breathable sheet, and a non-breathable sheet. However, if the sheet of the cooling body 20 facing the outer sheet 16 (the sheet oriented toward the non-face side of the cooling body 20) is a breathable sheet, it is preferable that the outer sheet 16 is also a breathable sheet. Here, the term "poorly permeable" refers to a property that makes it difficult for gas to pass through, and includes a property that is non-permeable.

[0022] <Structure of holding part> 1, in the cool mask 1, the holding parts 30 are provided in pairs and joined to the left and right face-contacting ends 5, which are both left and right ends of the mask body 2. The holding parts 30 hold the mask body 2 on the wearer's face. In this embodiment, the holding part 30 is an ear hook that can be attached to the wearer's ear. The holding part 30 has an ear hook main body 31 and an ear hook hole 32.

[0023] The retaining portion 30 may be made of the same material as or a different material from the mask body 2. From the viewpoint of improving the fit of the mask body 2, the retaining portion 30 is preferably made of a material having elasticity and easily stretchable in the width direction of the mask body 2. In this embodiment, the holding part 30 is preferably made of a nonwoven fabric, and more preferably a nonwoven fabric having elasticity. From the viewpoint of binding with the mask body 2, it is preferable that the constituent fiber contains a thermoplastic resin. Furthermore, from the viewpoint of ease of processing, it is more preferable that the holding part 30 contains PP. The holding part 30 may further contain a thermoplastic resin other than PP, and for example, it is preferable that the holding part 30 further contains one or more selected from the group consisting of urethane, PE, and PET, and it is more preferable to use synthetic fibers made of urethane. By adopting such a configuration, the flexibility and fit of the holding part 30 can be efficiently expressed, and sufficient strength can be expressed when the cool mask 1 is used.

[0024] Furthermore, the holding portion 30 is not limited to the flat ear loop described above, and any type of holding portion that can be normally used for masks can be used as long as it is capable of holding the mask body 2 in front of the wearer's face.

[0025] <Cooling body configuration> 3, the cooling element 20 is disposed in the mask body 2 so that at least a portion of the cooling element 20 comes into direct or indirect contact with the wearer's face when the mask is worn. In this embodiment, the cooling element 20 is disposed between the inner sheet 14 and the outer sheet 16 of the mask body 2. Therefore, the cooling element 20 comes into indirect contact with the wearer's face via the inner sheet 14 when the mask is worn.

[0026] The cooling body 20 is configured to contain a liquid (water in this embodiment, hereinafter sometimes referred to as "water"). By containing water, when the cooling mask 1 is worn, the cooling body 20 functions as a heat absorbing sheet to absorb heat inside the mask and suppress a rise in temperature inside the mask. Heat is then dissipated by evaporation of the liquid contained in the cooling body 20, lowering the temperature inside the mask and providing a feeling of coolness to the wearer.

[0027] The cooling body 20 is a flat body having a substantially rectangular planar shape. 4, the cooling element 20 includes a liquid-retaining layer 24, a first covering layer 26, and a second covering layer 28. An adhesive 33 is applied to the surface of the cooling element 20 facing the second covering layer 28. In the cooling mask 1, the cooling element 20 is fixed to the inner surface of the outer sheet 16 by the adhesive 33. The first covering layer 26 and the second covering layer 28 are formed to have the same shape and size, and their peripheral portions are joined by a joining portion 20a to form a bag body. The liquid-retaining layer 24 is held within the bag body. By forming such a bag body, it is possible to prevent unintended falling off of the constituent material of the liquid-retaining layer 24, thereby improving the production efficiency and appropriately adjusting the amount of steam.

[0028] [First coating layer and second coating layer] At least one of the first covering layer 26 and the second covering layer 28 can be made of an air-impermeable material (air permeability of 30000 sec / 100 mL or more). The other of the first covering layer 26 and the second covering layer 28 can be made of an air-permeable material. Here, "poorly permeable" refers to a property that makes it difficult for gas to pass through, and includes non-permeable properties (air permeability of 80,000 sec / 100 mL or more).

[0029] The air permeability of the air-impermeable member is preferably 50,000 sec / 100 mL or more, and more preferably 80,000 sec / 100 mL or more. By using such an air-impermeable member for at least one of the first covering layer 26 and the second covering layer 28, it becomes possible to control the direction and amount of evaporation of water from the liquid-retaining layer 24. This increases the continuity of the steam released from the cooling body 20, and makes it possible to maintain the cooling effect of the cooling body 20 for a long period of time.

[0030] As such an air-impermeable member, for example, a synthetic resin film can be used alone or in a laminate of multiple layers. Depending on the application, the air-impermeable member can be laminated with a nonwoven fabric or the like on the outer surface to improve the texture. The nonwoven fabric can be selected from needle-punched nonwoven fabric, air-through nonwoven fabric, spunbond nonwoven fabric, etc., and a laminate film made of a PE film and a pulp sheet is preferable. Note that the air-impermeable sheet may be partially air-permeable as long as it has low air permeability as a whole.

[0031] The air permeability of the breathable member is preferably 350 sec / 100 mL or less, and more preferably 100 sec / 100 mL or less, from the viewpoint of slowly releasing generated steam while not excessively humidifying the skin. By using such a breathable member for one of the first covering layer 26 and the second covering layer 28, it is possible to enhance the cooling effect on the face by the heat of vaporization and heat dissipation accompanying the evaporation of moisture.

[0032] Here, air permeability is a value measured according to JIS P8117 (revised in 2009), and is the value at which 100 mL of air passes through a hole at a constant pressure of 6.42 cm. 2 It is defined as the time it takes for air to pass through an area of ​​100 mm. Therefore, a large air permeability value means that it takes longer for air to pass through, i.e., the air permeability is low. Conversely, a small air permeability value means that the air permeability is high. Thus, there is an inverse relationship between the air permeability value and the air permeability. Air permeability can be measured using an Oken air permeability meter. In this specification, an air permeability of 30,000 sec / 100 mL or more is called "hard to breathe," and an air permeability of 80,000 sec / 100 mL or more is called "non-breathable."

[0033] A suitable example of such a breathable member is a porous sheet (moisture-permeable waterproof sheet) made of synthetic resin that has moisture permeability but no water permeability, i.e., prevents liquid water from passing through while allowing gaseous oxygen and gaseous moisture to pass through. Specifically, a film containing PE or PP and stretched can be mentioned. When such a porous sheet is used, a nonwoven fabric can be laminated on the outer surface of the porous sheet to enhance the texture of the breathable sheet. Examples of nonwoven fabric include needle punch nonwoven fabric, air-through nonwoven fabric, and spunbond nonwoven fabric. As long as the sheet does not allow water to pass through but allows oxygen and water vapor to pass through and leakage prevention is taken into consideration, it may be a nonwoven fabric other than a porous sheet. For example, woven fabric, nonwoven fabric, paper, synthetic paper, etc., which are a mixture of one or more types selected from artificial fibers such as polyamide, vinylon, polyester, rayon, acetate, acrylic resin, PE, PP, and polyvinyl chloride, and natural fibers such as pulp, cotton, hemp, silk, and animal hair, can be used as the breathable member.

[0034] It is preferable that one of the first covering layer 26 and the second covering layer 28 is breathable and the other is not breathable. In that case, the layers may be oriented toward the face side or the non-face side as appropriate depending on the purpose.

[0035] For example, it is preferable to use an air-permeable material for the covering layer located on the face side, and to use a non-air-permeable material for the covering layer located on the non-face side. In this embodiment, the first covering layer 26 located on the face side has air permeability, and the second covering layer 28 located on the non-face side has poor air permeability. This makes it possible to enhance the heat absorbing effect on the face, thereby enhancing the cooling effect at the initial stage of wearing the cooling mask 1 and providing a stable cooling sensation with little temperature fluctuation over a long period of time.

[0036] On the other hand, when a non-breathable material is used for the covering layer located on the face side and a breathable material is used for the covering layer located on the non-face side, it is possible to reduce the amount of steam released into the internal space 4 of the mask body 2. This makes it possible to reduce the humidity in the internal space 4 and reduce stuffiness. In this case, it is also possible to increase the effect of dissipating heat to the outside (outside air) of the cooling mask 1 due to the heat of vaporization, so that the temperature inside the mask body 2 can be further reduced by the cooling body 20.

[0037] [Liquid retaining layer] 4, the liquid-retaining layer 24 is located between the first covering layer 26 and the second covering layer 28. The liquid-retaining layer 24 is configured to be able to retain liquid. The liquid-retaining layer 24 includes a poorly liquid-permeable layer 23, a liquid retaining layer 21, an adhesive 22, and a liquid contained in the liquid retaining layer 21. The liquid-retaining layer 24 is a laminate 71 in which the poorly liquid-permeable layer 23 and the liquid retaining layer 21 are laminated in the thickness direction. The liquid-retaining layer 24, and the poorly liquid-permeable layer 23 and the liquid retaining layer 21 constituting the liquid-retaining layer 24 have a transport direction X during production of the liquid-retaining layer described below, and a width direction Y perpendicular to the transport direction X. 4, the poorly liquid-permeable layer 23 has one surface 23a and the other surface 23b. In the cooling mask 1, the one surface 23a is located on the inside, and the other surface 23b is located on the outside. The liquid retaining layer 21 has a first surface 21a and a second surface 21b. In the cool mask 1, the first surface 21a is located on the outer side, and the second surface 21b is located on the inner side. In the liquid retaining layer 24, one surface 23a of the poorly liquid permeable layer 23 and the first surface 21a of the liquid retaining layer 21 are joined by an adhesive 22 and are positioned in contact via the adhesive 22. In the cooling body 20, the other surface 23b of the poorly liquid permeable layer 23 is positioned in contact with the second covering layer 28, and the second surface 21b of the liquid retaining layer 21 is positioned in contact with the first covering layer 26.

[0038] (liquid) In this embodiment, the liquid held in the liquid holding layer 21 is water. The water retained in the liquid retention layer 21 may be derived from an aqueous electrolyte solution (e.g., an aqueous solution of an alkali metal, an alkaline earth metal, etc.), and may also contain preservatives, bacteriostatic agents, disinfectants, or antioxidants, such as ethanol, methylparaben, ethylparaben, propylparaben, butylparaben, phenoxyethanol, 1,3-butylene glycol, propylene glycol, and dipropylene glycol.

[0039] (Liquid hardly permeable layer) The poorly liquid-permeable layer 23 is provided so as to cover the first surface 21 a of the liquid retaining layer 21 . Here, the term "poorly liquid permeable" refers to a property that makes it difficult for liquid to pass through, and is a concept that includes both a property that does not allow liquid to pass through at all and a property that allows a small amount of liquid to pass through (liquid-impermeable).

[0040] 4, in this embodiment, when worn, the poorly liquid permeable layer 23 is disposed so as to be located on the non-face side (outer side) of the liquid retaining layer 21. This promotes evaporation of moisture in the liquid retaining layer 24 toward the face, and the associated heat of vaporization enhances the cooling effect on the face. Furthermore, by arranging the poorly liquid-permeable layer 23 so as to be located closer to the non-face side than the liquid retaining layer 21, the moisture in the liquid retaining layer 24 is prevented from evaporating to the non-face side. This increases the continuity of the vapor released from the cooling body 20, so that the cooling effect of the cooling body 20 can be maintained for a long period of time.

[0041] When worn, the poorly liquid permeable layer 23 may be disposed so as to be located closer to the face (inner) than the liquid retaining layer 21. In this case, it is possible to promote steam generation toward the non-face side, and to enhance the cooling effect inside the mask body 2 by the heat of vaporization associated therewith. In addition, by suppressing the evaporation of moisture in the liquid retaining layer 24 toward the face side, it is possible to suppress stuffiness on the face due to the steam released from the cooling body 20.

[0042] Even when the above-mentioned liquid-impermeable layer 23 is arranged on the face side and non-face side, the amount of vapor generated to the non-face side or face side can be appropriately changed by adjusting the air permeability of the liquid-impermeable layer 23. For example, when it is desired to promote steam generation by the heat of vaporization associated with the liquid-impermeable layer 23 and further enhance the cooling effect within the mask body 2, the liquid-impermeable layer 23 can be made of a material having an air permeability of 50 sec / 100 mL or less, preferably 10 sec / 100 mL or less, and more preferably 1 sec / 100 mL or less. Furthermore, a material that is non-breathable (air permeability of 80,000 sec / 100 mL or more) or poorly breathable (air permeability of 30,000 sec / 100 mL or more) can be used when it is desired to improve the effect of sustaining the cooling time for the face or inside the mask body 2. The air permeability of the poorly liquid-permeable layer 23 is preferably 50,000 sec / 100 mL or more, and more preferably 80,000 sec / 100 mL or more. Furthermore, when the poorly liquid-permeable layer 23 is positioned so as to be on the non-face side, by laminating the liquid retaining layer 21 on the poorly liquid-permeable layer 23, productivity is improved in the process of adding water to the liquid retaining layer 21 in the mask body 2 (liquid adding process) and the process of installing the cooling body 20 on the mask body 2 in the manufacturing method described below.

[0043] As the liquid-impermeable layer 23, for example, a synthetic resin film can be used, such as a PE film or a PET film. The synthetic resin film may be a single layer or a laminate of multiple layers. A nonwoven fabric, paper, or film, or a laminate of two or more of these can be used. In this embodiment, the poorly liquid-permeable layer 23 is made of PE-laminated thin paper, which is liquid-impermeable and is obtained by laminating a PE film on a thin paper.

[0044] (glue) 4, the adhesive 22 is disposed between the poorly liquid-permeable layer 23 and the liquid retaining layer 21 to bond them together. As the adhesive 22, a hot melt adhesive is typically used, but the adhesive is not limited thereto, and various known fixing means can be used. Here, in the liquid-retaining layer 24, the poorly liquid-permeable layer 23 and the liquid-retaining layer 21 are formed to have the same shape and size in a plan view, and are overlapped to form a laminate. The laminate has a substantially rectangular shape in a plan view. As shown in Figs. 5 and 9, the adhesive 22 is applied linearly along and in the vicinity of a pair of opposing side parts 24a of the liquid-retaining layer 24, which is the laminate 71. The extending direction of the pair of side parts 24a corresponds to a conveying direction X during production, which will be described later. In addition, as shown in Fig. 9, the liquid-retaining layer 24 has an adhesive-free region 24b, where the adhesive 22 is not applied, between the pair of adhesives 22 in a plan view.

[0045] (Liquid holding layer) The liquid retaining layer 21 is configured to be capable of retaining added water. 3, in this embodiment, the liquid retaining layer 21 includes a water retaining material 40. More specifically, the liquid retaining layer 21 is configured by disposing the water retaining material 40 between a first layer paper 41 and a second layer paper 42.

[0046] ((Water-retaining material)) The water retention material 40 has a water retention ability (water absorption or removal function), and there is no particular restriction on the type as long as it is capable of retaining water, but it is preferable that it has excellent vapor dissipation properties. The water retention material 40 may be, for example, one or more selected from a carbon component, a fiber material, a water-absorbent powder, and the like. The carbon component has a water retention capacity, and for example, one or more types selected from activated carbon, acetylene black, and graphite can be used. As the fiber material, it is more preferable to use hydrophilic fibers, especially cellulose fibers. As the cellulose fibers, chemical fibers (synthetic fibers) and natural fibers can be used. The water-absorbent powder may be one or more selected from the group consisting of vermiculite, sawdust, silica gel, calcium silicate, zeolite, pulp powder, and super absorbent polymer (SAP). In order to maintain the cooling effect of the cooling mask 1 for a long period of time, it is preferable that the cooling body 20 contains a sufficient amount of water. In order to obtain a high water absorption rate in the liquid retention layer, it is preferable to use a highly water-absorbent polymer as the water retention material 40. In the following description, the water retention material 40 is replaced with the highly water-absorbent polymer 40.

[0047] The superabsorbent polymer 40 may be a hydrophilic polymer having a crosslinked structure capable of absorbing and retaining 20 times or more of its own weight in liquid. The shape of the superabsorbent polymer 40 may be any of a sphere, a block, a bunch of grapes, and a fiber. The mass-average particle size of the superabsorbent polymer 40 is preferably 1 μm or more, more preferably 10 μm or more, and even more preferably 100 μm or more. The average particle size of the superabsorbent polymer 40 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 superabsorbent polymer is measured by a laser diffraction method.

[0048] Specific examples of the highly water-absorbent polymer include one or more selected from the group consisting of starch, crosslinked carboxymethylated cellulose, polymers or copolymers of acrylic acid or alkali metal salts of acrylic acid, polyacrylic acid and its salts, and polyacrylate graft polymers. Among these, polymers or copolymers of acrylic acid or alkali metal salts of acrylic acid, polyacrylic acid and its salts, and polyacrylate graft polymers are preferred because the amount of water supported is easily maintained within a specific range.

[0049] In order to obtain sufficient water retention to effectively exert the cooling effect when wearing the mask, the basis weight of the highly water-absorbent polymer in the liquid-retaining layer before adding water is 20 g / m 2 It is preferable that the thickness is 30 g / m or more. 2 More preferably, it is equal to or greater than this.

[0050] ((First and second layer paper)) The first layer paper 41 and the second layer paper 42 hold a superabsorbent polymer 40 therebetween. The first layer paper 41 and the second layer paper 42 are both moisture permeable sheets, and may be made of, for example, wood pulp paper. In this embodiment, the liquid retaining layer 21 is constructed by laminating and integrating, in this order, a wood pulp paper (second layer paper 42), a highly absorbent polymer 40 (AQUALIC CAW151, manufactured by Nippon Shokubai Co., Ltd.), and a wood pulp paper (first layer paper 41).

[0051] (Initial content of water retained in liquid-retaining layer) In one cooling body 20, the initial content of water held in the liquid-retaining layer 24 (i.e., the water content immediately after opening a packaging material such as an oxygen-barrier bag) is preferably 5.5 times or more, and more preferably 6 times or more, the weight of the liquid-retaining layer 24 before water is added, from the viewpoints of increasing the cooling effect when the cooling mask 1 is first worn, increasing the durability of the steam released from the cooling body 20, and maintaining the cooling effect of the cooling body 20 for a long period of time. Furthermore, from the viewpoint of reducing the weight of the cooling body 20 and preventing the cooling mask 1 from slipping off the face, the initial content of water held in the liquid-retaining layer 24 is preferably 20 times or less, and more preferably 15 times or less, the weight of the liquid-retaining layer 24 before the addition of water. Here, the "weight of the liquid retaining layer 24" refers to the total weight of the poorly liquid permeable layer 23 and the liquid retaining layer 21, excluding the weight of the adhesive 22.

[0052] The initial content of water held in the liquid retaining layer 24 is set to 1 cm from the viewpoint of enhancing the cooling effect of the cooling mask 1 at the initial stage of wearing the cooling mask 1, enhancing the continuity of the steam emitted from the cooling body 20, and maintaining the cooling effect of the cooling body 20 for a long period of time. 2 It is preferable that the volume is 0.04 mL or more per cm 2 More preferably, it is 0.08 mL or more per cm 2 It is more preferable that the amount of the liquid is 0.10 mL or more per cm. Also, from the viewpoint of reducing the weight of the cooling body 20 and preventing the cooling mask 1 from slipping off the face, 2 Preferably, the volume is 0.40 mL or less per cm 2 More preferably, it is 0.30 mL or less per cm 2 It is even more preferable that the amount is 0.25 mL or more per unit volume.

[0053] (Method for measuring the initial content of water retained in liquid-retaining layer) The weights of the poorly liquid-permeable layer and the liquid-retaining layer not containing any liquid are measured in advance using an electronic balance (weight before liquid addition).The weight of the liquid-retaining layer after the addition of the liquid is measured (weight after liquid addition). (Initial content of liquid) = (weight after adding liquid) - (weight before adding liquid)

[0054] The initial content of water held in the liquid-retaining layer 24 is preferably 1% by mass or more of the maximum water absorption of the liquid-retaining layer 24, from the viewpoints of increasing the cooling effect at the beginning of wearing the cooling mask 1, increasing the sustainability of the steam released from the cooling body 20, and maintaining the cooling effect of the cooling body 20 for a long period of time, more preferably 2% by mass or more, even more preferably 3% by mass or more, and even more preferably 4% by mass or more. Moreover, from the viewpoints of reducing the weight of the cooling body 20 and preventing the cooling mask 1 from slipping off the face, the initial content of water is preferably 20% by mass or less of the maximum water absorption of the liquid-retaining layer 24, more preferably 15% by mass or less, even more preferably 10% by mass or less, and even more preferably 7% by mass or less.

[0055] (Method for measuring maximum water absorption) The maximum water absorption of the liquid-retaining layer 24 can be measured, for example, by the following method. That is, first, a 250 mesh (61 μm) nylon woven bag (100 mm × 150 mm) and a sample are weighed, and the tare weight of the mesh bag and the weight of the sample are measured. Next, the sample is placed in the mesh bag, and the mesh bag is placed upright in a 300 mL beaker, and 300 mL of deionized water is added so that the mesh bag does not directly touch the water, and the sample is immersed for 30 minutes to allow it to swell sufficiently. After that, the sample is hung for 10 minutes to drain the water, and the sample is weighed to two decimal places on an analytical balance. Then, the maximum water absorption is calculated by the following formula using the "total weight of the mesh bag," "tare weight of the mesh bag," and "weight of the sample" obtained above. "Maximum water absorption" = "Total weight of mesh bag" - "Tare weight of mesh bag" - "Weight of sample"

[0056] [Cooling ingredients] From the viewpoint of imparting an even more cooling sensation to the cooling body 20, a cooling component can be blended or added to any portion within the scope of the invention. Of the temperature-sensitive TRP channels present in the body, one containing an agonist acting on TRPM8, which is a cold receptor, or one containing a TRPM8 agonist may be used. Examples of those containing agonists that act on TRPM8 include menthol, menthanediol, cineol, menthyl glyceryl ether, menthone glycerin acetal, butylcyclohexanone, isopulegol, menthyl acid, menthyl succinate, menthyl glutarate, trimethylisopropylbutanamide, menthoxypropanediol, camphor, and the like. Menthol includes L-menthol and DL-menthol. Examples of substances that contain TRPM8 agonists include vegetable oils and essential oils. Examples of vegetable oils include peppermint oil, spearmint oil, eucalyptus oil, and the like. These may be used alone or in combination of two or more. Among these, from the viewpoints of comfort, effectiveness, and safety during use, one or more selected from menthol, menthyl lactate, menthyl succinate, menthyl glutarate, trimethylisopropylbutanamide, menthoxypropanediol, and camphor are preferred, and menthol is more preferred.

[0057] From the viewpoint of reducing irritation to the wearer's skin, the coolant component is preferably added to a member located closer to the skin in the coolant mask 1. For example, in this embodiment, the coolant component is added to the second coating layer 28 of the cooling body 20. In this way, the cooling mask 1 may have a function of providing a cool sensation due to a cooling component in addition to the cooling function due to the liquid retaining layer. Also, as another function, it may have a fragrance component.

[0058] <Production equipment for liquid-retaining layers and cooling bodies> Next, a description will be given of manufacturing apparatuses according to the first and second embodiments used for manufacturing the liquid-retaining layer and the cooling body. In the method for producing the liquid-retaining layer 24 of the present invention using the production apparatus, water is added to the liquid-retaining layer 21 in multiple batches. This allows the liquid-retaining layer 21 of the liquid-retaining layer 24 to contain sufficient water, thereby obtaining a liquid-retaining layer 24 and a cooling body 20 that can maintain a cooling effect for a long period of time. This will be described in detail below.

[0059] <<First embodiment>> [Overall configuration of the liquid retaining layer and cooling body manufacturing equipment] First, a manufacturing apparatus 50 used for manufacturing the liquid-retaining layer 24 and the cooling body 20 will be described with reference to Fig. 5 and Fig. 6. The manufacturing apparatus 50 is a manufacturing apparatus for continuously manufacturing the liquid-retaining layer and the cooling body including the liquid-retaining layer on the same manufacturing apparatus. 5 and 6, the transport direction in which the liquid retaining layer and the cooling body are transported is defined as the X direction, and the width direction perpendicular to the X direction is defined as the Y direction.

[0060] In the manufacturing apparatus 50, each component of the liquid retaining layer 24 and the cooling body 20 is formed by cutting a continuous sheet-like member. Hereinafter, the sheet-like member constituting the liquid retaining layer 21 in the liquid retaining layer 24 before cutting is referred to as the liquid retaining sheet 210. The liquid retaining sheet 210 has a first surface 210a and a second surface 210b. The first surface 210a corresponds to the first surface 21a of the liquid retaining layer 21 formed by cutting, and the second surface 210b corresponds to the second surface 21b of the liquid retaining layer 21 formed by cutting. The sheet-like member constituting the poorly liquid-permeable layer 23 in the liquid-retaining layer 24 before cutting is referred to as the poorly liquid-permeable sheet 230. The poorly liquid-permeable sheet 230 has one surface 230a and the other surface 230b. The one surface 230a corresponds to one surface 23a of the poorly liquid-permeable layer 23 formed by cutting. The other surface 230b corresponds to the other surface 23b of the poorly liquid-permeable layer 23 formed by cutting. The sheet-like member constituting the first covering layer 26 in the cooling body 20 before cutting is referred to as a first covering sheet 260. The sheet-like member constituting the second covering layer 28 in the cooling body 20 before cutting is referred to as a second covering sheet 280.

[0061] As shown in FIG. 5 and FIG. 6, the manufacturing apparatus 50 includes a liquid-retaining layer manufacturing section 50A for manufacturing the liquid-retaining layer 24 and a cooling body manufacturing section 50B for manufacturing the cooling body 20. The manufacturing apparatus 50 has conveying means such as conveying rollers 49, and the various sheet-like members, the liquid retaining layer 24 and the cooling body 20 are conveyed in a conveying direction X by the conveying means.

[0062] In the liquid-retaining layer manufacturing unit 50A of the manufacturing apparatus 50, a laminated sheet 70 formed by laminating a continuous sheet-like liquid retaining sheet 210 and a poorly liquid-permeable sheet 230 is cut to form a plurality of laminates 71 (liquid-retaining layers 24). In the liquid-retaining layer manufacturing unit 50A, water is added to the liquid retaining layer 21 of the liquid-retaining layer 24 in a water adding step multiple times (four times in this embodiment) to manufacture the liquid-retaining layer 24 containing water. The liquid-retaining layer producing section 50A has an adhesive coating section 57, a first water adding section 51, a cutting blade for forming slits and perforations 55, a cutter roll 56 for cutting a sheet, a second water adding section 52, a third water adding section 53, and a fourth water adding section 54. In this way, the producing apparatus 50 of this embodiment has a total of four water adding sections 51 to 54, and is configured to be able to add water in multiple batches at different times.

[0063] In the manufacturing apparatus 50, the cooling body manufacturing section 50B stacks the first covering sheet 260 and the second covering sheet 280, each in the form of a continuous sheet, and cuts the laminate with the liquid-retaining layer 24 sandwiched between them, to manufacture a plurality of cooling bodies 20. The cooling body manufacturing section 50B has a joining section 58 and a cutting blade 59.

[0064] [Components of the liquid retaining layer and cooling body manufacturing equipment] (Adhesive application part) The adhesive applicator 57 applies the adhesive 22 to the first surface 210a of the liquid retaining sheet 210. As shown in Fig. 5, the adhesive 22 is applied to each of the cut and divided liquid retaining layers 24 (laminate 71) so as to be located at a pair of side portions 24a in a plan view. The adhesive 22 may be applied to one surface 230a of the poorly liquid permeable sheet 230.

[0065] (1st water addition part) The first water adding section 51 as the first liquid adding section supplies water to one surface 230a side of the poorly liquid permeable sheet 230. In this embodiment, the first water adding section 51 continuously ejects water. That is, water is constantly flowing from the first water adding section 51. The first water adding section may eject water intermittently. Details will be described later, but after the first water addition by the first water addition section 51, the liquid-impermeable sheet 230 and the liquid retention sheet 210 are superimposed, and the water supplied to the liquid-impermeable sheet 230 is added to the liquid retention sheet 210.

[0066] (Cutting blade for forming slits and perforations) The cutting blade 55 for forming slits and perforations forms slits 43 and perforations 44 in a laminated sheet 70 formed by bonding together, with the adhesive 22, a liquid-retaining sheet 210 to which adhesive 22 has been applied and a poorly liquid-permeable sheet 230 to which water has been added for the first time. A plurality of slits 43 are formed in the adhesive non-coated region 24b of the liquid retaining layer 24. The slits 43 are provided so as to penetrate the liquid retaining sheet 210 in its thickness direction. In the manufacturing apparatus 50, two liquid retaining layers 24 are formed so as to be aligned in the width direction Y. The perforation 44 is provided between two liquid retaining layers 24 arranged side by side in the width direction Y. The adhesive 22 is applied so that the adhesive 22 is not applied to the area where the perforation 44 is formed.

[0067] (Cutter roll for cutting sheets) The cutter roll 56 for cutting sheets has a plurality of cutting blades extending in the width direction Y. By the rotation of the cutter roll 56 for cutting sheets, the laminated sheet 70 is cut by the cutting blades, and the liquid-retaining layers (laminate) 24 adjacent to each other in the conveying direction X are separated from each other. After cutting by the cutter roll 56 for cutting sheets, the two liquid-retaining layers 24 aligned in the width direction Y are in a continuous form. In a subsequent width-widening step, the two liquid-retaining layers 24 are separated along the perforations 44 provided between them. As a result, the poorly liquid-permeable sheet 230 is cut to form a plurality of poorly liquid-permeable layers 23, and the liquid-retaining sheet 210 is cut to form a plurality of liquid-retaining layers 21.

[0068] (2nd water addition section, 3rd water addition section, 4th water addition section) The second water addition section 52 as the second liquid addition section, the third water addition section 53 as the third liquid addition section, and the fourth water addition section 54 as the fourth liquid addition section each add water from the second surface 21b side to the liquid retaining layer 21. The second water addition section 52, the third water addition section 53, and the fourth water addition section 54 intermittently eject water.

[0069] (joint part) The joint 58 joins the first covering sheet 260 and the second covering sheet 280, which are arranged with the liquid retaining layer 21, to which water has been added in multiple batches, therebetween, to form the joint 20a. The joint 20a is formed for each liquid retaining layer 21.

[0070] (Cutting blade) The cutting blade 59 cuts the first covering sheet 260 and the second covering sheet 280 joined at the joint 20 a , and separates them into individual cooling bodies 20 .

[0071] [Relationship of water addition positions in each water addition section] The relationship between the water adding positions of the water adding units will be described with reference to FIG. In FIGS. 8(A) to (D), the areas filled with dots typically show the spreading of the added liquid. Here, an example is given in which the poorly liquid permeable layer 23 and the liquid retaining layer 21 constituting the liquid retaining layer 24 have a rectangular shape with a length a of 49 mm in the width direction Y and a length b of 49 mm in the transport direction X in plan view. Note that these numerical values ​​and numerical values ​​indicating the positional relationship of the nozzles described below are merely examples, and the present invention is not limited to these numerical values.

[0072] 8(A) to 8(D), each of the water adding units 51 to 54 has nozzles 51a to 54a that eject water. The number of nozzles 51a to 54a in each of the water adding units 51 to 54 may be one or more, and in this embodiment, there is one nozzle. From the nozzles 51a to 54a, water is supplied to one surface 230a of the poorly liquid-permeable sheet 230 or to the liquid retaining layer 21. The poorly liquid-permeable layer 23 is formed by cutting the poorly liquid-permeable sheet 230 in a later process.

[0073] After the first water addition by the first water adding section 51, the poorly liquid permeable sheet 230 and the liquid retaining sheet 210 are bonded together. As a result, the water supplied to the poorly liquid permeable sheet 230 is absorbed by the liquid retaining sheet 210. That is, the first water adding section 51 indirectly adds water to the liquid retaining sheet 210 from the second surface 21b side thereof. As shown in Figure 8 (A), in the portion that will become the liquid-impermeable layer 23 to be separated and formed in a subsequent cutting process, when viewed in a plane, the center of the nozzle 51a is located on a virtual center line 72 that is parallel to the conveying direction X and that bisects the width direction Y of the liquid-impermeable layer 23. Water is supplied from the nozzle 51a to the poorly liquid-permeable layer 23 from one surface 230a side thereof.

[0074] 8(B), in plan view, the center of the nozzle 52a of the second water addition section 52 is located on the imaginary center line 72. In other words, in terms of the relative position of the nozzle with respect to the poorly liquid permeable layer 23 or the liquid retaining layer 21 constituting the liquid retaining layer 24, the nozzle 52a is located at the same position as the nozzle 51a, and is positioned offset in the width direction Y with respect to nozzles 53a and 54a described below. Water is supplied from the nozzle 52a to the liquid retaining layer 21 from the second surface 21b side thereof.

[0075] 8(C), in plan view, the nozzle 53a of the third water adding section 53 is located at a distance d of 10 mm between the center of the nozzle 53a and the imaginary center line 72 in the width direction Y. In other words, in terms of the relative position of the nozzle with respect to the poorly liquid permeable layer 23 or the liquid retaining layer 21 constituting the liquid retaining layer 24, the nozzle 53a is positioned shifted to one side (upper, lower side in FIG. 8) in the width direction Y than the nozzle 51a. Water is supplied from the nozzle 53a to the liquid retaining layer 21 from the second surface 21b side thereof.

[0076] 8(D), in plan view, the nozzle 54a of the fourth water adding section 54 is located at a distance e of 10 mm between the center of the nozzle 54a and the imaginary center line 72 in the width direction Y. In other words, in terms of the relative position of the nozzle with respect to the poorly liquid permeable layer 23 or the liquid retaining layer 21 constituting the liquid retaining layer 24, the nozzle 54a is located shifted toward the other side (upper side in FIG. 8) in the width direction Y than the nozzle 51a. Water is supplied from the nozzle 54a to the liquid retaining layer 21 from the second surface 21b side thereof.

[0077] In this way, at least two of the multiple water addition steps performed indirectly or directly to the liquid retaining layer 21 have different water addition positions (liquid addition positions) in the liquid retaining layer. In this embodiment, three water addition steps have different liquid addition positions. More specifically, the water addition positions are shifted in a direction perpendicular to the transport direction X during production (width direction Y) in the plane of the liquid retaining layer 21 to which water is added in a plan view. Here, the term "water addition position (liquid addition position)" refers to the nozzle tip position of each water addition section (liquid addition section) relative to the liquid retention layer 21 to which water (liquid) is to be added in a plan view.

[0078] In addition, in the second, third and fourth water addition steps, water is added to the liquid retention layer 21 from the second surface 21b side, whereas in the first water addition step, water is added to the liquid retention layer 21 from the first surface 21a side. The first water addition step is a water addition step carried out before the step of bonding the liquid retention sheet 210 and the poorly liquid permeable sheet 230 together. The first surface 21a (first surface 210a) of the liquid retaining layer 21 (liquid retaining sheet 210) is the surface that contacts one surface 23a (one surface 230a) of the poorly liquid permeable layer 23 (poorly liquid permeable sheet 230) in the state of the laminate 71 (laminate sheet 70). The first surface 21a (first surface 210a) and the one surface 23a (one surface 230a) are bonded with an adhesive 22. For this reason, in order to prevent peeling between the liquid retaining layer 21 (liquid retaining sheet 210) and the poorly liquid permeable layer 23 (poorly liquid permeable sheet 230) in the laminate 71 (laminate sheet 70), it is preferable that the water-added region (liquid-added region) 45 formed by the first water adding step performed before the bonding step does not overlap with the applied region of the adhesive 22 in plan view, as shown in Fig. 9. In other words, it is preferable that the water-added region 45 is located in the adhesive non-applied region 24b between a pair of adhesives 22. Furthermore, by configuring the water addition area 45 from the first water addition process performed before the bonding process so that it does not overlap with the application area of ​​the adhesive 22, water supplied onto the poorly liquid-permeable layer 23 (poorly liquid-permeable sheet 230) is quickly absorbed into the liquid retaining layer 21 (liquid retaining sheet 210) without being hindered by the adhesive 22, and water can be efficiently added to the liquid retaining layer 21 (liquid retaining sheet 210). Here, the term "water-added region (liquid-added region)" refers to the region in which water (liquid) is present when it is supplied to the poorly liquid-permeable layer 23 (poorly liquid-permeable sheet 230) and diffuses on the poorly liquid-permeable layer 23 (poorly liquid-permeable sheet 230). 9, as an example, the distance between a pair of adhesives 22 in the width direction Y, i.e., the length f of the adhesive non-coated region 24b in the width direction Y, is 41 mm. The length g of the water added region 45 in the width direction Y is 37 mm.

[0079] <Method of manufacturing the liquid-retaining layer and the cooling body> Next, a method for producing a liquid-retaining layer and a cooling body using the liquid-retaining layer using the production apparatus 50 will be described with reference to FIGS. 5 and 6 and in accordance with the flow of FIG.

[0080] As shown in FIGS. 5 and 6, the adhesive 22 is applied to the first surface 210a of the liquid retaining sheet 210 by the adhesive application unit 57 (adhesive application step, ST1). Moreover, water is supplied from the first water adding section 51 to one surface 230a of the poorly liquid permeable sheet 230 (first water adding step, ST2). The first water adding step (ST2) is a pre-cutting water adding step (pre-cutting liquid adding step) that is carried out before the laminated sheet 70 is cut.

[0081] Next, the first surface 210a of the liquid retention sheet 210 on which the adhesive 22 is applied is opposed to one surface 230a of the liquid-impermeable sheet 230, and the liquid retention sheet 210 and the liquid-impermeable sheet 230 are bonded together via the adhesive 22 (bonding process, ST3) to form the laminated sheet 70. In this lamination step, one surface 230a of the poorly liquid-permeable sheet 230 to which water was added in the first water adding step comes into contact with the first surface 210a of the liquid retaining sheet 210, so that the water supplied to the poorly liquid-permeable sheet 230 is added to the liquid retaining sheet 210 from the first surface 210a side. In this manner, water is added to the liquid retaining sheet 210 from the first surface 210a side by the first water adding step and the lamination step.

[0082] Next, slits 43 and perforations 44 are formed in the laminated sheet 70 by the slit and perforation forming cutting blade 55 (ST4). Next, the laminated sheet 70 is cut by the cutter roll 56 for cutting sheets (ST5). Through this cutting step, the laminated sheet 70 is cut into a laminate in which two liquid-retaining layers 24 aligned in the width direction Y are connected and adjacent liquid-retaining layers 24 aligned in the conveying direction X are separated from each other. Next, a re-pitching step is performed to widen the gap between each of the two liquid-retaining layers 24 arranged in the width direction Y along the conveying direction X (ST6). Next, the laminate in which two liquid-retaining layers 24 aligned in the width direction Y are connected together is separated into two liquid-retaining layers 24 along the perforation 44 by a width-widening step (ST7).

[0083] Next, the second covering sheet 280 is arranged so as to cover the other surface 23b of the poorly liquid permeable layer 23 of the liquid retaining layer 24 (ST8). In this embodiment, the second covering sheet 280 is provided with a cooling component.

[0084] Next, water is added from the second water adding section 52 to the second surface 21b of the liquid retaining layer 21 of the liquid retaining layer 24 (second water adding step, ST9). The second water adding section 52 adds water intermittently. Next, water is added from the third water adding section 53 to the second surface 21b of the liquid retaining layer 21 of the liquid retaining layer 24 (third water adding step, ST10). The third water adding section 53 adds water intermittently. Next, water is added from the fourth water adding section 54 to the second surface 21b of the liquid retaining layer 21 of the liquid retaining layer 24 (fourth water adding step, ST11). The fourth water adding section 54 adds water intermittently. The second water adding step (ST9), the third water adding step (ST10), and the fourth water adding step (ST11) are post-cutting water adding steps (post-cutting liquid adding steps) that are carried out after the laminated sheet 70 is cut. As a result of the above, a liquid-retaining layer 24 is produced, which includes the liquid retaining layer 21, the poorly liquid-permeable layer 23, the adhesive 22 that bonds the liquid retaining layer 21 and the poorly liquid-permeable layer 23, and water retained in the liquid retaining layer 21.

[0085] Next, the first covering sheet 260 is arranged so as to cover the second surface 21b of the liquid retaining layer 21 of the liquid retaining layer 24, and the liquid retaining layer 24 is sandwiched and held between the first covering sheet 260 and the second covering sheet 280 (ST12, covering step). Next, the first covering sheet 260 and the second covering sheet 280 are joined together so that the joint 20a is positioned outside the outer periphery of the liquid-retaining layer 24, and then cut and separated into individual cooling bodies 20 (ST13). In this way, a plurality of cooling bodies 20 are manufactured, each having the liquid-retaining layer 24 held between the first covering layer 26 and the second covering layer 28.

[0086] <Action and effect> In the above-mentioned method for producing a liquid-retaining layer, water is added to the liquid-retaining layer in a plurality of batches, so that the liquid-retaining layer can be made to contain a sufficient amount of water without contaminating the production apparatus, and the liquid-retaining layer can be produced efficiently. That is, by adding water in a plurality of times, the amount of water added in one time can be reduced, and therefore it is possible to ensure a sufficient time for the liquid retaining layer to absorb water in each water adding step relative to the conveying speed of the production apparatus 50. This makes it possible to prevent a situation in which the production apparatus is contaminated by overflowing water due to an insufficient water absorption time being ensured, and also makes it possible to efficiently produce a plurality of liquid-retaining layers in succession, thereby improving the production efficiency of the liquid-retaining layers. The liquid-impregnating layer thus produced contains sufficient water, and therefore can be a liquid-impregnating layer capable of exerting a cooling effect for a long period of time. In addition, the liquid-retaining layer includes a poorly liquid-permeable layer and a liquid-retaining layer, and during the manufacturing process of the liquid-retaining layer, the poorly liquid-permeable layer is located below the liquid-retaining layer. Therefore, water added to the liquid-retaining layer is unlikely to pass through the poorly liquid-permeable layer, and therefore, for example, water absorbed by the liquid-retaining layer does not leak out and cause contamination of the manufacturing equipment.

[0087] By adding water through the water addition process multiple times, it is possible to efficiently impregnate the liquid-retaining layer with a large amount of water relative to its size, for example, 5.5 times or more the total weight of the liquid-retaining layer (laminate of the liquid-permeable layer and the liquid-retaining layer) before water addition, thereby obtaining a liquid-retaining layer that exhibits a cooling effect for a long period of time.

[0088] As described above, a cutting step may be provided between multiple water addition steps. In the above-mentioned example of the manufacturing method, the multiple water addition steps include a water addition step before cutting (ST2) and a water addition step after cutting (ST9, ST10, ST11). By providing a cutting step between multiple water addition steps in this way, cutting is performed in a state in which the liquid retaining layer contains an amount of water that is less than the target amount of water to be added in the end. This makes it possible to reduce water overflow from the liquid retaining layer that retains water due to pressure from the cutting blade during the cutting step, and to suppress contamination of the manufacturing equipment.

[0089] As described above, in the first water addition step among the multiple water addition steps, water is added indirectly from the first surface 21a side of the liquid retaining layer 21. On the other hand, in the second to fourth water addition steps, water is added directly from the second surface 21b side of the liquid retaining layer 21. In this way, by adding water to the liquid retaining layer 21 from both sides, it is possible to efficiently add a sufficient amount of water to the liquid retaining layer 21 over the entire area in the thickness direction. After the first water addition step, the poorly liquid-permeable sheet 230 and the liquid retaining sheet 210 are bonded together to form the laminated sheet 70. In the first water addition, water is added from the first surface 21a of the liquid retaining layer 21, so that in the state of the laminated sheet 70, the first surface 210a to which water is added is not exposed but is located inside the sheet, making it difficult for water to evaporate from the second surface 210b. This improves the efficiency of water use, enabling efficient water addition. Furthermore, in this embodiment, the addition of water from the first surface 21a of the liquid retaining layer 21 is performed before the cutting step (ST5). During the cutting step, the cutting blade enters from the second surface 21b opposite to the first surface 21a to which water is added, so that the overflow of liquid from the liquid retaining layer retaining water due to the pressure from the cutting blade during the cutting step can be further reduced. Therefore, the occurrence of contamination of the manufacturing equipment can be further suppressed.

[0090] In the above-mentioned manufacturing method, immediately after the first water adding step (ST2), the poorly liquid-permeable sheet 230 and the liquid retaining sheet 210 are bonded together (bonding step ST3). The liquid retaining sheet 210 used in this bonding is transported under tension in the transport direction before bonding. For this reason, in the first water adding step, it is preferable that water is added to the poorly liquid-permeable sheet 230, not the liquid retaining sheet 210. That is, when water is added directly to the liquid retaining sheet 210, the liquid retaining sheet 210 before merging with the poorly liquid-permeable sheet 230 is under tension, so that it tends to break due to the addition of water. For this reason, from the viewpoint of suppressing the breakage of the liquid retaining sheet 210, it is preferable to add water to the poorly liquid-permeable sheet 230 and then bring the liquid retaining sheet 210 into contact with the poorly liquid-permeable sheet 230 to indirectly add water to the liquid retaining sheet 210.

[0091] Furthermore, as described above, it is preferable that at least two of the multiple water addition steps are performed such that the water addition positions relative to the liquid retaining layer are shifted from each other in the direction perpendicular to the transport direction X (width direction Y) within the plane of the liquid retaining layer. In this way, by performing the water adding step multiple times at different water adding positions, water can be added evenly to the liquid retaining layer 21 across the width direction Y. Furthermore, since the liquid retaining layer 21 to which water is added is always flowing in the transport direction X during the water adding step, water can be added evenly to the liquid retaining layer 21 across the transport direction X. As a result, water can be efficiently distributed across almost the entire surface of the liquid retaining layer 21.

[0092] As described above, in the state of the laminated sheet 70 in which the poorly liquid-permeable sheet 230 and the liquid retaining sheet 210 are bonded together as shown in FIG. 9, it is preferable that the water-added area 45 in the first water-adding step performed before the bonding step and the application area of ​​the adhesive 22 do not overlap in a planar view. This ensures sufficient adhesive strength between the poorly liquid permeable sheet 230 and the liquid retaining sheet 210 in the laminated sheet 70, and prevents peeling between them. Also, in the laminated body 71 (liquid-retaining layer 24), this ensures sufficient adhesive strength between the poorly liquid permeable layer 23 and the liquid retaining layer 21, and prevents peeling between them. This improves the transport stability of the laminated sheet 70 and the laminated body 71 (liquid-retaining layer 24), and enables stable production of high-quality liquid-retaining layers.

[0093] Furthermore, as described above, before the second to fourth water addition steps, a plurality of slits 43 may be provided in the liquid retaining sheet 210 constituting the liquid retaining layer 21. By providing the slits 43, water absorption in the liquid retaining layer 21 in the second to fourth water addition steps is likely to be promoted, and contamination of the production equipment can be further suppressed.

[0094] The specific amount of water added in each water addition step will be described later as an example, but it is preferable to make the amount of water added in the latter water addition steps (e.g., the third water addition step and the fourth water addition step) less than the amount of water added in the earlier water addition steps (e.g., the first water addition step and the second water addition step). This makes it possible to further suppress contamination of the manufacturing equipment. That is, among the multiple water addition steps, the water absorption capacity of the liquid retaining layer 21 to which water is to be added is sufficiently high at the time of the first water addition step, whereas at the time of the second water addition step, the liquid retaining layer 21 already retains water, so that the water absorption capacity tends to be somewhat lower. Therefore, by adding water so that the amount of water is relatively large in the first half and so that the amount of water is relatively small in the second half, the occurrence of water overflow in the second half is suppressed, and contamination of the manufacturing equipment is suppressed.

[0095] In the manufacturing method of the cooling body 20 described above, the liquid-retaining layer 24 manufactured by the manufacturing method described above is sandwiched between the first covering sheet 260 and the second covering sheet 280, and for each liquid-retaining layer 24, a joint 30a is formed that joins the first covering sheet 260 and the second covering sheet 280 so as to surround the liquid-retaining layer 24 in a planar view, and then the cooling body 20 is separated by cutting. In this embodiment, the liquid-retaining layer 24 and the cooling body 20 including the liquid-retaining layer 24 are continuously manufactured on the same manufacturing apparatus 50. Therefore, the liquid-retaining layer 24 manufactured by adding water is immediately covered with the first covering sheet 260 and the second covering sheet 280, and the liquid-retaining layer 24 is held in the bag formed by joining these two sheets, which makes it easier to suppress evaporation of water. As a result, the quality of the cooling effect of the cooling mask 1 can be stably maintained.

[0096] <<Second embodiment>> A manufacturing apparatus 150 according to the second embodiment and a method for manufacturing the liquid-retaining layer 24 and the cooling body 20 by the manufacturing apparatus 150 will be described with reference to FIG. The manufacturing apparatus 150 is a manufacturing apparatus that continuously manufactures a liquid-retaining layer and a cooling body including the liquid-retaining layer on the same manufacturing apparatus, similarly to the manufacturing apparatus 50 of the first embodiment. Hereinafter, the same reference numerals are used for the same configurations as those of the first embodiment, and the description thereof may be omitted. In FIG. 10, the description will be given assuming that the conveying direction in which the liquid retaining layer and the cooling body are conveyed is the X direction, and the width direction perpendicular to the X direction is the Y direction.

[0097] In the manufacturing method using the manufacturing apparatus 50 of the first embodiment, the liquid retaining sheet 210 and the poorly liquid-permeable sheet 230 were separately carried into the manufacturing apparatus 50, and the liquid retaining sheet 210 to which the adhesive was applied and the poorly liquid-permeable sheet 230 to which water had been added for the first time were bonded together to form the laminated sheet 70. In other words, the first water addition was performed before the laminated sheet 70 was formed.

[0098] In contrast, in the manufacturing apparatus 150 of the second embodiment, as shown in Fig. 10, a laminated sheet 70 in which a poorly liquid-permeable sheet 230 has already been laminated to a liquid retention sheet 210 is carried in. The laminated sheet 70 is cut to obtain a plurality of laminated bodies 71. The laminated sheet 70 in the second embodiment has a laminated structure of a liquid retaining sheet 210 and a poorly liquid-permeable sheet 230. The surface of the liquid retaining sheet 210 facing the poorly liquid-permeable sheet 230 is referred to as a first surface 210a, and the opposite surface is referred to as a second surface 210b. The surface of the poorly liquid-permeable sheet 230 facing the liquid retaining sheet 210 is referred to as one surface 230a, and the opposite surface is referred to as the other surface 230b. The liquid retaining sheet 210 constitutes the liquid retaining layer 21 of the laminated body 71, and the poorly liquid-permeable sheet 230 constitutes the poorly liquid-permeable layer 23 of the laminated body 71. In the second embodiment, water is added in all of the multiple water adding steps from the liquid retaining sheet 210 side or the liquid retaining layer 21 side to the laminated sheet 70 or laminate 71. That is, in the second embodiment, water is added in the multiple water adding steps from the second surface 210b side of the liquid retaining sheet 210 or the second surface 21b side of the liquid retaining layer 21. In this embodiment, the first water addition is performed on the laminated sheet 70, and the second to fourth water additions are performed on the laminated sheet 70 obtained by cutting the laminated sheet 70. As in the manufacturing method using the manufacturing apparatus 150 of the second embodiment, a manufacturing method in which water is added to the laminated sheet 70 multiple times without performing the water adding step before the formation of the laminated sheet 70 may also be used.

[0099] As shown in FIG. 10, the manufacturing apparatus 150 has conveying means such as conveying rollers 49, and the various sheet-like members, the liquid retaining layer 24 and the cooling body 20 are conveyed in a conveying direction X by the conveying means. The manufacturing apparatus 150 has a first water addition section 51, a cutting blade for forming slits and perforations (not shown), a cutter roll 56 for cutting the sheet, a second water addition section 52, a third water addition section 53, a fourth water addition section 54, a joining section 58, and a cutting blade 59.

[0100] In the manufacturing apparatus 150, a laminated sheet 70 formed by laminating a liquid retention sheet 210 and a poorly liquid-permeable sheet 230 is carried in. Next, the first water adding section 51 supplies water to the second surface 210b of the liquid retaining sheet 210 constituting the laminated sheet . Thereafter, the cooling body 20 is manufactured through steps similar to ST4 to ST13 of the manufacturing method described in the first embodiment. As described above, in the manufacturing method according to the second embodiment, all of the multiple liquid adding steps are performed from the second surface 21b side of the liquid retaining layer 21.

[0101] In the production method according to the second embodiment, similarly to the first embodiment, water is added to the liquid-retaining layer in a number of batches, whereby the liquid-retaining layer can be made to contain a sufficient amount of water without contaminating the production apparatus, and the liquid-retaining layer can be produced efficiently.

[0102] <How to make a cooling mask> Next, the configuration of a manufacturing apparatus 60 for the cooling mask 1 having the cooling body 20 manufactured by the above-mentioned manufacturing apparatus 50 or 150 will be described with reference to FIG. In FIG. 11, the conveying direction in which the cooling body 20 and the cooling mask 1 are conveyed is defined as the X direction, and the width direction perpendicular to the X direction is defined as the Y direction.

[0103] In the manufacturing apparatus 60, the inner sheet 14 and the outer sheet 16 which constitute a part of the cooling mask 1 are formed by cutting a continuous sheet-like member. Hereinafter, the sheet-like member constituting the inner sheet 14 before cutting will be referred to as the inner sheet 140 before cutting, and the sheet-like member constituting the outer sheet 16 before cutting will be referred to as the outer sheet 160 before cutting.

[0104] As shown in FIG. 11, the manufacturing apparatus 60 has a conveying means (not shown), and the various sheet-like members, the cooling body 20, and the cooling mask 1 are conveyed in a conveying direction X by the conveying means.

[0105] A method for manufacturing the cool mask 1 using the manufacturing apparatus 60 will be described with reference to FIG. 11, in the manufacturing equipment 60, adhesive 33 is applied onto the pre-cut outer sheet 160, and the cooling body 20 manufactured in the manufacturing equipment 50 is carried in so that the cooling body 20 is placed on the adhesive 33. The cooling body 20 manufactured in the manufacturing equipment 50 is carried out so that the first coating layer 26 is located on the upper side. The cooling body 20 is carried into the manufacturing equipment 60 with the first coating layer 26 located on the upper side. Next, the pre-cut inner sheet 140 is placed on the pre-cut outer sheet 160 having the cooling element 20 fixed thereto by the adhesive 33 so as to cover the cooling element 20 . After the pre-cut outer sheet 160 and the pre-cut inner sheet 140 are overlapped with the cooling body 20 held therebetween, a pair of holding parts 30 are placed on the pre-cut inner sheet 140. The stacked holding parts 30, pre-cut inner sheet 140, and pre-cut outer sheet 160 are then joined at both sides in the width direction Y of the sheets to form a joint 390. The joint 390 becomes the joint 39 that joins the holding parts 30 and the mask body 2 in the cooling mask 1. Next, the uncut inner sheet 140 and the uncut outer sheet 160 are folded along a fold line along a center line that bisects the width direction Y so that the uncut inner sheet 140 is on the inside. Next, the folded uncut inner sheet 140 and the uncut outer sheet 160 are cut out into a shape that conforms to the outer shape of the cool mask 1. Next, parts of the periphery of the cut-out members are joined to form the upper joint portion 4a and the lower joint portion 4b, and the cooling mask 1 is manufactured. The cooling mask 1 manufactured in this manner is provided with a cooling body 20 that contains a sufficient amount of water, and therefore can be a cooling mask 1 that exerts a cooling effect for a long period of time.

[0106] <Example> An embodiment of the method for manufacturing the liquid-retaining layer will be described below with specific values. In the following description, specific values ​​showing the configuration of the components and the manufacturing conditions in the manufacturing apparatus for the liquid-retaining layer and the cooling body are given, but these are merely examples and are not intended to be limiting.

[0107] As the poorly liquid permeable layer 23 and the liquid retaining layer 21 constituting the liquid retaining layer 24, members each having a planar shape of 49 mm×49 mm were used. The liquid impermeable layer 23 has a basis weight of 32 g / m 2 PE laminated tissue paper (manufactured by Nittoku Corporation, cellulose basis weight 21g / m 2 , polyethylene basis weight 11g / m 2 ) was used. The first layer paper 41 and the second layer paper 42 constituting a part of the liquid retaining layer 21 have a basis weight of 20 to 40 g / m 2 In this embodiment, the first layer paper 41 has a basis weight of 30 g / m 2 The second layer paper 42 is made of wood pulp paper having a basis weight of 20 g / m 2 Wood pulp paper was used. The basis weight of the highly water-absorbent polymer (AQUALIC CAW151 manufactured by Nippon Shokubai Co., Ltd.) 40 constituting a part of the liquid retaining layer 21 is, for example, 20 to 70 g / m 2 In this embodiment, it is 70 g / m 2 The following was used. The total weight of the liquid-retaining layer 24, excluding the adhesive 22, was about 0.365 g. For one liquid-retaining layer 24 configured in this manner, the above-mentioned manufacturing apparatus 50 was used and the above-mentioned manufacturing method was used to add 0.8 g of water in the first water addition step, 1.2 g of water in the second water addition step, 0.5 g of water in the third water addition step, and 0.5 g of water in the fourth water addition step, for a total of 3.0 g of water, to produce the liquid-retaining layer 24 and the cooling body 20. Furthermore, the processing speed of the manufacturing apparatus 50 was adjusted so that 200 cooling bodies 20 were manufactured per minute. In this embodiment, about 8.2 times the weight of the liquid-retaining layer before the water addition was added. Even when a large amount of water is added to the liquid-retaining layer compared to the size of the liquid-retaining layer, by adding water in a plurality of times, it was confirmed that the time for the liquid retention layer 21 to absorb the liquid in each water addition step can be sufficiently secured relative to the conveying speed (processing speed), and a plurality of liquid-retaining layers and cooling bodies can be efficiently manufactured in succession while preventing contamination of the manufacturing equipment due to overflow of the liquid.

[0108] Although the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

[0109] For example, in the above embodiment, an example was described in which the water addition step (liquid addition step) was performed four times, but the number of times is not limited to four, and may be two or more. In addition, for example, in the above-mentioned embodiment, the liquid-retaining layer containing water exhibiting a cooling function is taken as an example, but the present invention is not limited thereto. The present invention can be applied to a method for producing a liquid-retaining layer that retains a liquid, in which a large amount of liquid (water in the above-mentioned embodiment) is added to the liquid-retaining layer that is the liquid-receiving additive. In this case as well, it is possible to improve production efficiency while suppressing contamination of the production apparatus due to overflow of the liquid. [Explanation of symbols]

[0110] 21...Liquid retention layer 23…Liquid hardly permeable layer 23a…One side 24…Liquid retaining layer

Claims

1. A method for producing a liquid-retaining layer comprising a laminate of a poorly liquid-permeable layer and a liquid retaining layer disposed on one surface side of the poorly liquid-permeable layer, and a liquid contained in the liquid retaining layer, comprising: The method includes a step of adding the liquid to the liquid retaining layer in a plurality of portions, The liquid includes water or an aqueous electrolyte solution, the liquid added to the liquid retaining layer in each of the multiple liquid adding steps is the same liquid, the liquid retaining layer has a transport direction and a width direction perpendicular to the transport direction, The liquid addition steps are carried out multiple times at different times, In at least two of the multiple liquid adding steps, liquid adding positions with respect to the liquid retaining layer are different from each other in the width direction within the plane of the liquid retaining layer. Method for producing the liquid-retaining layer.

2. the liquid-retaining layer to which the liquid has been added by the liquid-adding step multiple times contains the liquid in an amount of from 5.5 to 20 times the total weight of the liquid-retaining layer before the liquid is added; A method for producing the liquid-retaining layer according to claim 1.

3. The liquid retaining layer contains a highly absorbent polymer. The method for producing the liquid-retaining layer according to claim 2 .

4. In the manufacturing process of the liquid-retaining layer, the liquid-impermeable layer is transported in a state where it is positioned below the liquid-retaining layer. The method for producing the liquid-retaining layer according to claim 1 or 2.

5. the liquid retaining layer has a first surface in contact with the poorly liquid-permeable layer and a second surface opposite to the first surface, The liquid adding step performed multiple times includes a liquid adding step from the first surface side and a liquid adding step from the second surface side. The method for producing the liquid-retaining layer according to claim 1 or 2.

6. In the liquid addition step from the first surface side, the liquid is supplied to the one surface of the poorly liquid-permeable layer, and then the first surface and the one surface are brought into contact with each other, thereby adding the liquid to the liquid retaining layer from the first surface side. The method for producing the liquid-retaining layer according to claim 5 .

7. The laminate is formed by cutting a laminated sheet obtained by bonding together a poorly liquid-permeable sheet constituting the poorly liquid-permeable layer and a liquid retaining sheet constituting the liquid retaining layer with an adhesive, An adhesive application step of applying the adhesive to at least one of the liquid-impermeable sheet or the liquid retaining sheet; The liquid-impermeable sheet and the liquid-retaining sheet are bonded together via the adhesive. At least one of the liquid adding steps is performed before the bonding step; In the laminated sheet, a liquid addition region in the liquid addition step performed before the bonding step does not overlap with an adhesive application region in a plan view. The method for producing the liquid-retaining layer according to claim 5 .

8. The laminate is formed by cutting a laminated sheet obtained by laminating a poorly liquid-permeable sheet constituting the poorly liquid-permeable layer to a liquid-retaining sheet constituting the liquid-retaining layer, In the liquid addition step, the liquid is added to the laminated sheet or the laminate from the liquid retaining sheet side or the liquid retaining layer side. The method for producing the liquid-retaining layer according to claim 1 or 2.

9. A method for manufacturing a cooling body having a first covering sheet, a second covering sheet, and a liquid-retaining layer held between the first covering sheet and the second covering sheet, comprising: A step of producing the liquid-retaining layer by the production method according to claim 1 or 2; and a coating step of holding the liquid-retaining layer between the first coating sheet and the second coating sheet. A method for manufacturing a cooling body.

10. A method for manufacturing a mask having a mask body with a cooling body between an outer sheet and an inner sheet, comprising: A step of manufacturing the cooling body by the manufacturing method according to claim 9; and holding the cooling body between the outer sheet and the inner sheet. A method for manufacturing a mask.

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