Disposable diaper

Abstract

To provide a disposable diaper that can further reduce skin trouble.SOLUTION: A disposable diaper (1) comprises an absorbing core (21) comprising an absorbing material, and a skin surface sheet (40) located closer to a skin side (T1) than the absorbing core (21), and to be brought into contact with skin of a wearer. The disposable diaper (1) has predetermined absorbing performance. The skin surface sheet (40) has a surface friction coefficient (MIU) of 0.20 or less, and comprises coconut oil. The coconut oil may be applied to a surface of fiber constituting the skin surface sheet.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a disposable diaper. [Background technology]

[0002] Patent Document 1 provides a disposable diaper with a top sheet to which a skin care agent is applied, which applies the skin care agent to the wearer's skin, thereby preventing skin troubles. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-131044 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in recent years, awareness of preventing skin troubles has increased, and there is a demand for disposable diapers that can further suppress skin troubles. In particular, in the case of long-term disposable diapers, which are worn for long periods of time and may continue to be worn even after excretion, skin troubles are more likely to occur, and there is a greater demand for suppressing skin troubles.

[0005] The present invention has been made in consideration of such problems, and provides a disposable diaper that can further reduce skin troubles. [Means for solving the problem]

[0006] A disposable diaper according to one embodiment includes an absorbent core having an absorbent material, and a skin-contact sheet located closer to the skin than the absorbent core and in contact with the skin of a wearer. The disposable diaper has a predetermined absorption performance. The skin-contact sheet has a surface friction coefficient (MIU) of 0.20 or less and contains coconut oil. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a schematic front view of a disposable diaper according to an embodiment. [Diagram 2] FIG. 2 is a plan view of the disposable diaper according to the embodiment as viewed from the skin side. [Diagram 3] FIG. 3 is a plan view of the disposable diaper according to the embodiment as viewed from the non-skin side. [Figure 4] FIG. 4 is a cross-sectional view taken along the line AA shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] (1) Overview of the embodiment At least the following points will become apparent from the description of this specification and the accompanying drawings. The invention according to the first aspect is a disposable diaper having an absorbent core having an absorbent material and a skin-facing sheet located closer to the skin than the absorbent core and in contact with the skin of a wearer. The disposable diaper has a predetermined absorption performance. The skin-facing sheet has a surface friction coefficient (MIU) of 0.20 or less and contains coconut oil. According to this aspect, since the skin-facing sheet has a low MIU, the skin-facing sheet continues to smoothly contact the skin, and skin troubles can be suppressed even when used for a long time. Furthermore, since the skin-facing sheet contains coconut oil, the coconut oil component can moisturize the skin and the skin can be smoothly contacted, and skin troubles can be suppressed even when used for a long time. Furthermore, since the skin-facing sheet contains coconut oil, it is possible to obtain an effect of suppressing skin troubles caused by the components of coconut oil itself. In addition, it is possible to provide a sense of security by the fact that the wearing assistant has coconut oil, which is gentle on the skin.

[0009] According to a preferred embodiment, the invention according to embodiment 2 may have the following features in the invention according to embodiment 1. The coconut oil is applied to the surface of the fibers constituting the skin-contact sheet. According to this embodiment, since coconut oil is applied to the surface of the fibers of the contact sheet, coconut oil can be distributed not only on the surface of the skin-contact sheet but also throughout the entire thickness direction. Therefore, the efficacy of coconut oil components can be imparted to the wearer not only when the surface of the skin-contact sheet touches the skin, but also in various situations, such as when the skin is pressed into the skin-contact sheet.

[0010] According to a preferred embodiment, the invention according to embodiment 3 may have the following features in the invention according to embodiment 1 or embodiment 2. The coconut oil is contained within the fibers that make up the skin-contact sheet. According to this embodiment, since coconut oil is contained within the fibers that make up the skin-contact sheet, the coconut oil is less likely to be washed away by bodily fluids, etc., and the coconut oil content is less likely to decrease even with long-term use, so that the benefits of the coconut oil components can be provided to the wearer over a long period of time.

[0011] According to a preferred embodiment, the invention according to embodiment 4 may have the following features in the invention according to any one of embodiments 1 to 3. The coconut oil is applied to the surface of the skin-facing sheet. According to this embodiment, since coconut oil is applied to the surface that comes into direct contact with the skin, even a small amount of coconut oil can provide the wearer with the benefits of the coconut oil components.

[0012] According to a preferred embodiment, the invention according to embodiment 5 may have the following features in the invention according to any one of embodiments 1 to 4: the compressive energy WC value of the skin-facing sheet is 0.05 N·m / m 2 According to this aspect, the skin-contact sheet has a compression energy WC value of 0.05 N·m / m 2 As described above, the sheet has a certain cushioning property and is easily fitted to the skin when worn. Therefore, the skin-facing sheet can be brought into contact with the skin to impart the effects of coconut oil.

[0013] According to a preferred embodiment, the invention according to embodiment 6 may have the following features in the invention according to any one of embodiments 1 to 5. The skin-contact sheet is disposed in a waist region extending in the front-rear direction from a waist opening. The waist region is an area that comes into close contact with the skin, and by providing a skin-contact sheet in this area, skin troubles can be further suppressed. In addition, the waist region is a place that a putting assistant touches when putting on the disposable diaper or correcting the disposable diaper from shifting when worn. By disposing the skin-contact sheet in this waist region, the putting assistant can more easily feel a sense of security due to the presence of coconut oil that is gentle on the skin.

[0014] According to a preferred embodiment, the invention according to embodiment 7 may have the following features in the invention according to any one of embodiments 1 to 6. The waist region does not have a non-breathable sheet, but has a ventilation region in which a breathable sheet is arranged. According to this embodiment, the ventilation region can improve the breathability of the waist region, and can further prevent skin troubles.

[0015] According to a preferred embodiment, the invention according to embodiment 8 may have the following features in the invention according to any one of embodiments 1 to 7. A fragrance component containing at least one of γ-nonalactone, γ-undecalactone, and wine lactone is added. γ-nonalactone, γ-undecalactone, and wine lactone all have a fragrance similar to coconut odor. By adding the coconut fragrance component to the disposable diaper, the wearer and the wearing assistant can recognize that the diaper contains coconut oil that is gentle on the skin, and the satisfaction of use can be increased. Before use, the wearer can notice the presence of coconut oil, and during use, the wearer can continue to wear the diaper with peace of mind while feeling the sense of security that comes from the presence of coconut oil.

[0016] According to a preferred embodiment, the invention according to embodiment 9 may have the following features in the invention according to any one of embodiments 1 to 8. The disposable diaper is provided with evocative information evoking coconut oil. According to this embodiment, the wearer and the putting assistant can recognize the presence of coconut oil by visually recognizing the evocative information. The wearer can recognize that the disposable diaper is gentle on the skin and can use the disposable diaper with peace of mind.

[0017] (2) Disposable diaper according to an embodiment Hereinafter, a disposable diaper 1 according to an embodiment will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted with the same or similar reference numerals. However, it should be noted that the drawings are schematic and the ratios of the dimensions may differ from the actual ones. Therefore, the specific dimensions should be determined with reference to the following description. In addition, the drawings may include parts with different dimensional relationships and ratios.

[0018] The disposable diaper 1 is a disposable diaper that can absorb excrement from a wearer. The disposable diaper 1 may be for infants or for the elderly. The disposable diaper 1 may be a disposable diaper that is put on the wearer by an assistant (for example, a caregiver (parent, etc.), childcare worker, caregiver, etc.). The disposable diaper may be a tape-type or a pants-type. The disposable diaper 1 of this embodiment is a pants-type disposable diaper for infants.

[0019] FIG. 1 is a schematic front view of a disposable diaper 1 according to an embodiment. FIG. 2 is a schematic plan view of the disposable diaper 1 according to an embodiment in an unfolded and stretched state as viewed from the skin side T1. FIG. 3 is a schematic plan view of the disposable diaper 1 according to an embodiment in an unfolded and stretched state as viewed from the non-skin side T2. The unfolded and stretched views shown in FIG. 2 and FIG. 3 show an extended state in which the disposable diaper 1 is extended to a state in which no wrinkles are formed with the side joint portion 60 described below being extended. In the present invention, the "extended state" refers to a state in which the entire product (the entire product) is extended without wrinkles, specifically, a state in which the dimensions of each component constituting the disposable diaper 1 are extended to the same or close to the dimensions of the component alone.

[0020] The disposable diaper 1 has a front waist region S1, a rear waist region S2, and a crotch region S3. The front waist region S1 is a region facing the front waist (abdomen) of a wearer. The rear waist region S2 is a region facing the rear waist (back) of a wearer. The crotch region S3 is a region located between the front waist region S1 and the rear waist region S2, between which the wearer is placed. The crotch region S3 may be a region in which leg openings 66 are provided.

[0021] As shown in FIG. 1, a side joint 60 may be provided by joining an end of the front waist region S1 (front exterior body 51) in the width direction W with an end of the rear waist region S2 (rear exterior body 52) in the width direction W. The side joint 60 is defined by a portion where an outer portion of the front waist region S1 and an outer portion of the rear waist region S2 are engaged with each other. With the side joint 60 formed, the disposable diaper 1 is provided with a waist opening 62 through which the torso of the wearer passes and which surrounds the torso of the wearer, and a pair of leg openings 66 through which the legs of the wearer are inserted and which surround the legs of the wearer. The waist opening 62 may be defined by a front edge of the front waist region S1 and a rear edge of the rear waist region S2. FIGS. 2 and 3 show the disposable diaper 1 in an unfolded state after the joining at the side joint 60 is released.

[0022] In the present invention, the outer portion refers to a portion occupying a certain range in the width direction W including the outer edge in the width direction W, and the outer edge refers to the outer edge in the width direction W. In the present invention, the inner portion refers to a portion occupying a certain range in the width direction W including the inner edge in the width direction W, and the inner edge refers to the inner edge in the width direction W. In addition, the front end and rear end refers to a portion occupying a certain range in the front-to-back direction L including edges in the front-to-back direction L, and the front edge and rear edge are edges in the front-to-back direction L. The outer end includes the front end and rear end, and the outer edge includes the front edge and rear edge.

[0023] The disposable diaper 1 may have an exterior body 50 and an absorbent body 15. The exterior body 50 may have a portion disposed on the non-skin side T2 of the absorbent body 15, and covers at least the waist of the wearer. A portion of the exterior body 50 may be disposed on the skin side T1 of the absorbent body 15. The exterior body 50 may have a front exterior body 51 disposed in the front waist region S1, and a rear exterior body 52 disposed in the rear waist region S2. The front exterior body 51 and the rear exterior body 52 may be disposed apart from each other in the front-rear direction L. In a modified example, the front exterior body 51 and the rear exterior body 52 may be integrated together. The front exterior body 51 and the rear exterior body 52 may have a first exterior sheet 55, a second exterior sheet 56 disposed inside the first exterior sheet 55 in the thickness direction T, and a third exterior sheet 57 disposed between the first exterior sheet 55 and the second exterior sheet 56. The exterior body 50 may have waist elastic members 58 arranged to be stretchable in the width direction W.

[0024] The first exterior sheet 55 and the second exterior sheet 56 are sheet members having a rectangular shape in a plan view, and may be composed of a liquid-permeable sheet such as a nonwoven fabric. The first exterior sheet 55 and the second exterior sheet 56 may be breathable sheets. The second exterior sheet 56 and the first exterior sheet 55 may have a folded region folded back to the skin side T1 of the absorbent main body 15 from the non-skin side T2 to the skin side T1 and from the outside to the inside in the front-rear direction L, and a non-folded region arranged on the non-skin side T2 of the folded region. The non-folded region is arranged on the non-skin side T2 of the absorbent main body 15, and the folded region is arranged on the skin side T1 of the absorbent main body 15. The folds at which the first exterior sheet 55 and the second exterior sheet 56 are folded back constitute the "waist opening 62". The folded region of the first exterior sheet 55 is located on the skin side T1 of the absorbent core 21 and is in contact with the wearer's skin, and may constitute the "skin-facing sheet 40" of the present invention. It should be noted that the folded region does not necessarily have to be provided.

[0025] The third exterior sheet 57 is a sheet member having a rectangular shape in a plan view, and may be formed of, for example, a liquid-impermeable sheet such as a film. The third exterior sheet 57 may be a non-breathable sheet. The non-skin side T2 surface of the third exterior sheet 57 may be printed. At least a part of the printing may constitute the "recall information 80" of the present invention.

[0026] The waist elastic member 58 is a stretchable member arranged along the width direction W and stretchable in the width direction, and in this embodiment, a white rubber thread is used. The waist elastic members 58 may be arranged in a line in the front-rear direction L and attached in a stretched state in the width direction W. The waist elastic member 58 may be arranged between the non-folded region of the second exterior sheet 56 and the third exterior sheet 57. The front waist region S1 and the rear waist region S2 fit the waist of the wearer due to the stretchability exhibited by the waist elastic member 58. Note that, although the disposable diaper 1 of this embodiment is provided with the waist elastic member 58, a stretchable member such as a stretch sheet may be arranged to stretch the front waist region S1 and the rear waist region S2 in the left-right direction.

[0027] The absorbent main body 15 may be disposed across the front waist region S1, the rear waist region S2 and the crotch region S3. The absorbent main body 15 may be configured as a separate body from the front exterior body 51 and the rear exterior body 52, and may be joined to the front exterior body 51 and the rear exterior body 52 in the front waist region S1 and the rear waist region S2, respectively. The absorbent main body 15 may have at least an absorbent core 21, a top sheet 31 disposed on the skin side T1 of the absorbent core 21, and a back sheet 32 ​​disposed on the non-skin side T2 of the absorbent core 21.

[0028] The absorbent core 21 may contain, for example, ground pulp or superabsorbent polymer (SAP), or a mixture thereof. The absorbent core 21 may be covered by a core wrap sheet. The top sheet 31 may be a liquid-permeable sheet. The top sheet 31 is located closer to the skin side T1 than the absorbent core 21 and contacts the wearer's skin, and may constitute the "skin-facing sheet 40" of the present invention. The back sheet 32 ​​may have a liquid-impermeable leak-proof sheet 32A and a main body outer sheet 32B arranged on the non-skin side T2 than the leak-proof sheet 32A. The leak-proof sheet 32A may be made of a film and may constitute a non-breathable sheet. The main body outer sheet 32B may be made of a nonwoven fabric. The surface of the leak-proof sheet 32A on the non-skin side T2 may be printed. At least a part of the print may constitute the "recall information 80" of the present invention.

[0029] The disposable diaper 1 of the present invention has a predetermined absorption performance and is configured to have a high water retention performance. The predetermined absorption performance is a water retention performance equal to or higher than a water retention performance determined for each recommended weight of the disposable diaper 1. Specifically, a diaper having a water retention performance of 120 g / p or more for a recommended weight of less than 10 kg is considered to have the predetermined absorption performance. A diaper having a water retention performance of 160 g / p or more for a recommended weight of 10 kg or more and less than 20 kg is considered to have the predetermined absorption performance. A diaper having a water retention performance of 200 g / p or more for a recommended weight of 20 kg or more and less than 30 kg is considered to have the predetermined absorption performance. A diaper having a water retention performance of 320 g / p or more for a recommended weight of 30 kg or more is considered to have the predetermined absorption performance. A diaper having the predetermined absorption performance can be used for a long time, for example, for 12 hours or more.

[0030] Here, the water retention performance can be measured by the following method. First, the disposable diaper to be measured is laid out in an unfolded state. For example, in the case of a pants-type disposable diaper, the side joints are separated and the disposable diaper is laid out. Next, the elastic members that are shrinking the absorbent are removed or cut, and the absorbent is laid flat with no contraction force acting on it. The disposable diaper is used as the sample to be measured. Next, the weight of the sample is measured (E), and the sample is placed in a container in which the entire sample can be immersed, and is immersed for 30 minutes in physiological saline (0.9% NaCl solution, a solution in which NaCl is dissolved in distilled water) poured into the container to allow it to swell sufficiently. After 30 minutes, the sample is placed in a dehydrator (150G) with the top sheet side facing the outer surface of the dehydration tank, and dehydrated for 90 seconds, and then its weight (F) is measured. The water retention capacity of the absorbent is calculated using the formula F(g)-E(g).

[0031] The present invention is a diaper having high water retention performance, and some users may use it for a long time. However, the longer the time the diaper is worn, the more likely troubles will occur. In addition, when the time the diaper is worn is long, there are cases where the diaper is continued to be worn even after excretion, and skin troubles are more likely to occur. Therefore, the diaper according to the present invention is configured to further suppress skin troubles. Next, the configuration for suppressing skin troubles will be described in detail. The diaper according to the present invention is characterized by the configuration of the skin-facing sheet 40 that contacts the wearer's skin, and is configured to further suppress skin troubles. The skin-facing sheet 40 is a sheet located on the skin side T1 of the absorbent core 21, abuts against the wearer's skin, has a surface friction coefficient (MIU) of 0.20 or less, and contains coconut oil. In this embodiment, both the top sheet 31 and the folded-back region of the first exterior sheet 55 constitute the skin-facing sheet 40.

[0032] The skin-side sheet 40 has a surface friction coefficient (MIU) of 0.20 or less and contains coconut oil. The surface friction coefficient (MIU) is a value that indicates slipperiness, with a smaller value indicating easier slipperiness. Because the skin-side sheet 40 has a low MIU, the skin-side sheet 40 continues to smoothly contact the skin, and skin troubles can be suppressed even with long-term use. In addition, because the skin-side sheet 40 contains coconut oil, the coconut oil component can moisturize the skin and allow the sheet to smoothly contact the skin, and skin troubles can be suppressed even with long-term use.

[0033] In disposable diapers for infants, the wearer who wears the disposable diaper and the assistant who buys and puts on the disposable diaper are different. Therefore, the assistant cannot feel the texture of the disposable diaper 1 when wearing it, and it is sometimes difficult to realize that the disposable diaper can suppress skin troubles. In addition, as a result of the applicant's extensive research, it was found that the assistant generally has the image of coconut oil being gentle on the skin and suppressing skin troubles. Therefore, by having a skin-facing sheet 40 containing coconut oil in a disposable diaper for infants, in addition to the effect of suppressing skin troubles caused by the components of coconut oil itself, it is possible to give the assistant a sense of security by having coconut oil that is gentle on the skin. Coconut oil is a vegetable oil extracted from the fruit of the coconut palm.

[0034] At least one of the sheets (the top sheet and the first outer sheet in this embodiment) located on the skin side T1 of the absorbent core 21 and in contact with the wearer's skin may function as the skin-facing sheet 40 having a surface friction coefficient (MIU) of 0.20 or less and containing coconut oil. Preferably, the entirety of the sheet has a surface friction coefficient (MIU) of 0.20 or less and contains coconut oil, but a part of the sheet may have a surface friction coefficient (MIU) of 0.20 or less and contain coconut oil. The skin-facing sheet 40 may be provided with oil consisting of only coconut oil, or may be provided with oil containing other oils (e.g., olive oil).

[0035] Here, the surface friction coefficient (MIU) can be measured, for example, by the following method. When the load on the friction element (the part in contact with the sample) is W and the friction force with the sample is F, the friction coefficient μ can be expressed by the following formula. Friction coefficient μ = friction force F / load W The surface friction coefficient (MIU) is the average value of the friction coefficient μ over the measurement length L1. (1) The measurement device used was an automated surface testing machine (KESFB4-AUTO-A manufactured by Kato Tech Co., Ltd.) with a friction force detection function. The measurement conditions were: the contact area of ​​the friction element was 5 mm × 5 mm (0.25 cm 2 ) and the load W, including the weight of the friction element, is 50 gf (approximately 0.5 N) in the vertical direction. (2) Prepare a measurement sample by cutting it from the absorbent article so that it is at least 40 mm long and at least 15 mm wide. When measuring an area of ​​the disposable diaper where unevenness is formed on the surface, such as the topsheet, cut the measurement sample in the direction in which the friction element moves across the convex and concave parts. In an area where no concave or convex parts are formed, cut in the direction in which the friction element moves along the width direction or the front-back direction, and measure. (3) The measurement sample is set in an automated surface testing machine with a tension of 400 g, the above-mentioned friction probe is brought into contact with the sample with a load W, the friction probe is moved at a speed of 1 mm / sec, and the friction force F is measured, and the average coefficient of friction (MIU) is calculated using the above formula, etc. (4) Repeat the above measurement five times using different samples, and use the average value of the surface friction coefficient (MIU).

[0036] Whether or not a product contains coconut oil can be verified using the following method. The oil from the coconut oil-containing portion of the target disposable diaper can be extracted using an acetone solution, etc., and the components can be analyzed using a method such as an infrared spectrophotometer (IR). If the component analysis shows that the diaper contains a large amount of lauric acid, which is found in large amounts in coconut oil, as well as myristic acid and palmitic acid, it can be determined that the product contains coconut oil. In addition, if the target disposable diaper itself or the packaging of the disposable diaper contains any description of the inclusion of coconut oil (ingredients information, any description suggesting the presence of coconut oil, any description of the presence of cocoa), it can be determined that the product contains coconut oil.

[0037] Coconut oil may be applied to the surface of the fibers that make up the skin-side sheet 40. Because coconut oil is applied to the surface of the fibers of the skin-side sheet 40, coconut oil can be distributed not only on the surface of the skin-side sheet 40 but also throughout the entire area in the thickness direction T. Therefore, the benefits of the coconut oil components can be imparted to the wearer not only when the surface of the skin-side sheet 40 touches the skin, but also in various situations, such as when the skin is pressed into the skin-side sheet 40.

[0038] An example of a method for applying coconut oil to the fiber surface of the skin-contact sheet is to add coconut oil to the oil agent of the skin-contact sheet. The oil agent can be, for example, a mixture of coconut oil, water, and a surfactant. The oil agent can be applied to the fiber surface. According to the skin-contact sheet 40 containing an oil agent having coconut oil, the oil agent is easily exuded by excreted body fluids, and the coconut oil component contained in the oil agent is easily brought into contact with the wearer's skin.

[0039] In a modified embodiment, coconut oil may be contained in the fibers that make up the skin-side sheet 40. Since coconut oil is contained in the fibers that make up the skin-side sheet 40, the coconut oil is unlikely to flow out due to bodily fluids, and the content of coconut oil is unlikely to decrease even with long-term use, so that the effects of the coconut oil components can be provided to the wearer for a long period of time. Furthermore, since the fibers of the skin-side sheet 40 contain coconut oil, coconut oil can be disposed not only on the surface of the skin-side sheet 40 but also throughout the entire thickness direction. Therefore, the effects of the coconut oil components can be provided to the wearer not only when the surface of the skin-side sheet 40 touches the skin, but also in various situations, such as when the skin is pressed into the skin-side sheet 40.

[0040] An example of a method for applying coconut oil to the fibers of the skin-side sheet 40 is to add coconut oil to the resin components (polyethylene, polypropylene, etc.) that make up the fibers. Additives may be added to the resin components as necessary. Skin-side sheet 40 in which coconut oil has been added to the resin components of the fibers makes it difficult for the oil to seep out due to excreted body fluids, and the benefits of the coconut oil components can be provided to the wearer for a long period of time.

[0041] Moreover, coconut oil may be applied to the surface of the skin-facing sheet 40. Since coconut oil is applied to the surface that comes into direct contact with the skin, even a small amount of coconut oil can impart the benefits of the coconut oil components to the wearer.

[0042] Coconut oil may be applied to the surface of the skin-facing sheet 40 by applying it to the surface of the above-mentioned fibers, or by coating or spraying it onto the surface of a molded sheet. By applying coconut oil to the surface of a molded sheet, coconut oil can be applied to intended areas of the skin-facing sheet 40, such as areas where skin troubles should be suppressed or areas where skin troubles are likely to occur, and the effects of coconut oil ingredients can be imparted to the wearer.

[0043] Coconut oil also contains lauric acid, a medium-chain fatty acid. This prevents the growth of bacteria on areas that come into contact with the skin. Coconut oil also contains antioxidants such as vitamin E and polyphenols. This provides antioxidants to the skin, moisturizes it, and helps prevent skin problems.

[0044] The compression energy WC value of the skin sheet 40 is 0.05 N·m / m 2 The compression energy WC value indicates elasticity (resilience, resilience) against compression, and the larger this value is, the easier it is to resilient against compression, i.e., the more cushioning properties there are. The skin-facing sheet 40 has a compression energy WC value of 0.05 N·m / m 2As described above, the sheet has a certain cushioning property and is easily fitted to the skin when worn. Therefore, the skin-facing sheet can be brought into contact with the skin to impart the effects of coconut oil.

[0045] Here, the compression energy WC value can be measured, for example, by the following method. The compression energy WC value can be obtained by subjecting a sample to a compression property evaluation test using an automated compression tester "KES FB-3A" (manufactured by Kato Tech Co., Ltd.). At this time, the compression element of the tester is centered at the center of the cushion part in the width direction for measurement. The measurement conditions for the compression property evaluation test are as follows: SENS:2 Speed: 0.02mm / sec Stroke: 5mm / 10V Compressor area: 2cm2 Capture interval: 0.1 seconds Maximum load: 50gf / cm2 Number of repetitions: 1

[0046] The skin-facing sheet 40 may be disposed in a waist region R62 extending inward in the front-rear direction from the waist opening 62. The waist region R62 is a region extending inward in the front-rear direction L from the waist opening 62. The waist region R62 may be a region in which the folded-back region of the waist region R62 constituting the skin-facing sheet 40 is disposed, or may be a region within 60 mm from the waist opening 62 toward the inside in the front-rear direction. In this embodiment, the first exterior sheet 55 is disposed in the waist region R62. The waist region R62 is a region that comes into close contact with the skin, and by providing the skin-facing sheet 40 in this region, skin troubles can be further suppressed. In addition, the waist region R62 is a place that a putting assistant touches when putting on the disposable diaper or correcting the dislocation of the disposable diaper when wearing it. By disposing the skin-facing sheet 40 in the waist region R62, a feeling of security can be given by the putting assistant having coconut oil that is gentle on the skin. The first exterior sheet 55 may be disposed so as to extend beyond the ends of the top sheet 31 in the front-rear direction and cover a portion of the top sheet 31 .

[0047] The waist region R62 may be provided with a ventilation region R65 in which a non-breathable sheet is arranged, instead of a non-breathable sheet. The breathable sheet is a breathable sheet such as a nonwoven fabric, and the non-breathable sheet is a non-breathable sheet such as a film. The ventilation region R65 is a region in which a non-breathable sheet is not arranged over the entire thickness direction T. In this embodiment, the ventilation region R65 is a region in which the first exterior sheet 55 and the second exterior sheet 56 are arranged, and the third exterior sheet 57 is not arranged, and is a region between the waist opening 62 and the outer edge of the third exterior sheet 57 in the front-rear direction L. By providing the ventilation region R65, the breathability of the waist region can be improved, and skin trouble can be further suppressed. Preferably, the ventilation region R65 may be provided adjacent to the waist opening 62. The breathability in the vicinity of the waist opening 62 can be improved, and skin trouble can be further suppressed.

[0048] The disposable diaper may be provided with an aroma component containing at least one of γ-nonalactone, γ-undecalactone, and wine lactone. γ-nonalactone, γ-undecalactone, and wine lactone all have an aroma similar to coconut odor. By providing the aroma component to the disposable diaper 1, the wearer and the wearing assistant can recognize that the diaper contains coconut oil that is gentle on the skin. Before use, the wearer can notice the presence of coconut oil, and during use, the wearer can continue to wear the diaper with peace of mind while feeling a sense of security due to the presence of coconut oil. The aroma component may be provided anywhere on the disposable diaper, and in the case of the disposable diaper 1 contained in a package, the aroma component may be provided inside the package.

[0049] According to the disposable diaper of this embodiment, since coconut oil is applied to the skin-facing sheet 40 that contacts the wearer's skin, it is possible to inform the wearer and the wearing assistant that the diaper contains coconut oil. When the wearing assistant takes out the diaper to put on the wearer and touches the relevant part of the diaper, the wearing assistant feels a very soft touch by touching the skin-facing sheet having an MIU of 2.0 or less. In addition, the wearing assistant who understands that the diaper contains coconut oil feels a very soft touch and at the same time expects that the presence of coconut oil is good for the skin. This effect can be further enhanced by adding an odor reminiscent of coconut oil, which can further increase the expectation and recognition that the diaper is gentle on the wearer's skin.

[0050] The disposable diaper 1 may be provided with evocative information 80 that recalls coconut oil. According to this embodiment, the wearer and the wearing assistant can recognize the presence of coconut oil by visually recognizing the evocative information 80. The evocative information 80 may be configured to be visible from the skin side T1 or the non-skin side T2 of the disposable diaper 1. The wearing assistant, etc., recognizes the evocative information 80 when visually checking the outer surface of the disposable diaper 1, and can recognize the presence of coconut oil. In this embodiment, the evocative information 80 is printed on the non-skin side of the leak-proof sheet 32A, and the evocative information 80 is printed on the non-skin side of the third outer sheet 57. Therefore, the wearing assistant, etc., can recognize the presence of coconut oil when visually checking the outer surface of the disposable diaper. The wearing assistant, etc., can recognize that the disposable diaper is gentle on the skin, and can use the disposable diaper with peace of mind. The evocative information 80 may be a design or characters showing coconut oil itself, or may be a design or characters that evokes an image of coconut oil. As shown in Fig. 3, the evocative information 80 of this embodiment includes a design of coconut oil contained in a container, a design showing coconut palm, which is the raw material for coconut oil, and a design showing a coconut palm tree.

[0051] Although the present invention has been described in detail using the above-mentioned embodiment, it is clear to those skilled in the art that the present invention is not limited to the embodiment described in this specification. The present invention can be implemented in modified and altered forms without departing from the spirit and scope of the present invention defined by the description of the claims. Therefore, the description in this specification is intended to be illustrative and does not have any limiting meaning on the present invention. [Explanation of symbols]

[0052] 21: Absorption core 31: Surface sheet (skin-facing sheet) 32: Back sheet 32A: Leak-proof sheet 32B: Body outer sheet 40: Skin-facing sheet 50: Exterior body 51: Front exterior body 52: Rear exterior body 55: First exterior sheet (skin-facing sheet) 56: Second exterior sheet 57: Third exterior sheet (non-breathable sheet) 60: Side joint 62: Waist opening L: Direction R62: Waist area R65: Ventilation area S1: Front waist area S2: Rear waist area S3: Inseam area T: Thickness direction T1: Skin side T2: Non-skin side W: Width direction

Claims

1. an absorbent core having an absorbent material; A disposable diaper having a predetermined absorption performance, the disposable diaper comprising: a skin-facing sheet located closer to the skin than the absorbent core and in contact with the skin of a wearer; The disposable diaper has a surface friction coefficient (MIU) of 0.20 or less and contains coconut oil.

2. The disposable diaper according to claim 1 , wherein the coconut oil is applied to a surface of the fibers constituting the skin-facing sheet.

3. The disposable diaper according to claim 1 , wherein the coconut oil is contained in fibers constituting the skin-facing sheet.

4. The disposable diaper according to claim 1 , wherein the coconut oil is applied to a surface of the skin-facing sheet.

5. The compression energy WC value of the skin-facing sheet is 0.05 N·m / m ２ The disposable diaper according to any one of claims 1 to 4, wherein:

6. The disposable diaper according to claim 1 , wherein the skin-facing sheet is disposed in a waist region extending in a front-rear direction from a waist opening.

7. 7. The disposable diaper according to claim 6, wherein the waist region is provided with a ventilation region in which a non-breathable sheet is not arranged and a breathable sheet is arranged.

8. The disposable diaper according to claim 1 , which is scented with at least one of γ-nonalactone, γ-undecalactone, and wine lactone.

9. The disposable diaper according to any one of claims 1 to 4, further comprising evocative information evocative of coconut oil.

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