JP6920070B2 - Absorbent article - Google Patents

Description

The present invention relates to an absorbent article comprising a surface sheet on which a skin care agent is arranged and leak-proof cuffs arranged on both sides of the surface sheet.

For absorbent articles such as disposable diapers, those equipped with a leak-proof cuff that stands up toward the wearer's skin at the inseam when worn as a leak-proof wall to prevent lateral leakage of excrement such as urine from the inseam. Are known. In a typical leak-proof cuff, one end side of the hydrophobic leak-proof cuff forming sheet in the lateral direction is joined to another member such as a back surface sheet to form a fixing portion, and the other end side is folded back inside the folded portion. The elastic member has a structure in which it is fixed in an extended state. In the leak-proof cuff having such a configuration, the folded portion of the leak-proof cuff forming sheet is joined to other members such as a surface sheet at the ventral and dorsal portions extending in front of and behind the inseam, and at the inseam. It is a free end that is not joined to other members. As a result, when the absorbent article is worn, the contraction force of the elastic member acts in the vertical direction orthogonal to the horizontal direction, that is, in the direction corresponding to the front-back direction of the wearer, and the leak-proof cuff at the lower crotch starts from the fixed portion. Stand up with the free end side facing the wearer's skin. A pocket is formed between the standing leak-proof cuff and the surface sheet to prevent lateral leakage of body fluid from the inseam.

In addition, when an absorbent article is worn, a rash may occur on the skin due to stuffiness or the like. Therefore, in order to prevent such skin troubles, it has been conventionally practiced to arrange a skin care agent on a portion of the absorbent article that can come into contact with the wearer's skin. For example, Patent Document 1 describes that a lotion having a skin care effect is placed on a surface sheet of a disposable diaper provided with a leak-proof cuff. The technique described in Patent Document 1 has a main problem of suppressing a decrease in absorption capacity which is a concern by arranging a lotion on a surface sheet, and the means for solving the problem is characterized by an arrangement pattern of the lotion on the surface sheet. Can be attached.

Japanese Patent Application Laid-Open No. 2008-522772

Some useful skin care agents applied to absorbent articles are hydrophilic, but when the hydrophilic skin care agents are placed on the surface sheet of absorbent articles with a hydrophobic leak-proof cuff, they are protected. When the leak-proof cuff falls down to the surface sheet side and comes into contact with it, the skin care agent is transferred from the surface sheet to the leak-proof cuff to reduce the hydrophobicity of the leak-proof cuff, and the hydrophobicity of the leak-proof cuff is lowered. Excretion such as urinary stool may leak from the part.

Therefore, an object of the present invention is to provide an absorbent article having an excellent skin care effect by suppressing the leakage of excrement caused by the skin care agent arranged on the surface sheet adhering to the leak-proof cuff.

The present invention has a vertical direction corresponding to a direction extending from the ventral side of the wearer to the dorsal side via the crotch portion and a lateral direction orthogonal to the vertical direction, and a liquid-retaining absorber and a vertical direction of the absorber. It is arranged along both sides along the direction, and is arranged between a pair of leak-proof cuffs having a standing portion that stands up toward the wearer's skin starting from a fixed portion with another member, and a pair of leak-proof cuffs. An absorbent article comprising a surface sheet that overlaps the absorber at a position closer to the wearer's skin than the absorber, wherein a hydrophilic skin care agent is arranged on the surface sheet, and the upright portion is It has a tip portion that overlaps with the absorber in a plan view when the upright portion is laid down on the surface sheet side, and a base end portion located between the tip portion and the fixed portion. The end portion includes an inner sheet arranged at a position relatively close to the absorber and an outer sheet arranged opposite to the inner sheet at a position relatively far from the absorber. The outer sheet and the inner sheet are each hydrophobic at least on one side, and there is a separation portion between the inner sheet and the outer sheet in which both sheets are separated from each other in the thickness direction. It is a sex article.

According to the present invention, an absorbent article having an excellent skin care effect is provided, in which the leakage of excrement caused by the skin care agent arranged on the surface sheet adhering to the leak-proof cuff is suppressed.

FIG. 1 is a plan view schematically showing the skin-facing surface, that is, the surface sheet side of the deployable disposable diaper according to the embodiment of the absorbent article of the present invention, and the elastic members of each part are extended and expanded in a plane shape. It is a plan view in the unfolded state. FIG. 2 is a cross-sectional view schematically showing a cross section taken along line I-I of FIG. 1, showing a state in which the leak-proof cuff is laid down inward in the lateral direction of the diaper. FIG. 3 is a cross-sectional view schematically showing an enlarged leak-proof cuff on one side of FIG. 2 and its vicinity. FIG. 4 is a cross-sectional view schematically showing an upright state of the leak-proof cuff shown in FIG. FIG. 5 is a view corresponding to FIG. 3 of another embodiment of the absorbent article of the present invention. FIG. 6 is a view corresponding to FIG. 4 of still another embodiment of the absorbent article of the present invention. FIG. 7 is a view corresponding to FIG. 4 of still another embodiment of the absorbent article of the present invention. FIG. 8 is a view corresponding to FIG. 4 of still another embodiment of the absorbent article of the present invention. FIG. 9 is a view corresponding to FIG. 4 of still another embodiment of the absorbent article of the present invention. FIG. 10 is a view corresponding to FIG. 4 of still another embodiment of the absorbent article of the present invention.

Hereinafter, the absorbent article of the present invention will be described with reference to the drawings based on the deployable disposable diaper which is a preferred embodiment thereof. The deployable disposable diaper 1A shown in FIGS. 1 and 2 has a vertical direction X corresponding to a direction extending from the ventral side of the wearer to the dorsal side via the crotch portion and a lateral direction Y orthogonal to the vertical direction X, and is worn. It has a crotch part B arranged in the crotch part of a person, and a ventral side part A and a dorsal side part C extending in front of and behind the crotch part B. The ventral portion A, the inseam B, and the dorsal portion C correspond to each region when the diaper 1A is divided into three equal parts in the vertical direction X. The inseam B has an excretion portion facing portion that is arranged to face the excretion portion of the wearer's penis, anus, etc. when the diaper 1A is worn, and the excretion portion facing portion is usually in the vertical direction X of the diaper 1A. It is located in or near the center.

As shown in FIGS. 1 and 2, the diaper 1A has a liquid-retaining absorber 4 and a fixing portion located on the outer side of the absorbent body 4 on both side edges 4S and 4S along the vertical direction X in the horizontal direction Y. It is arranged between a pair of leak-proof cuffs 5 and 5 that stand up toward the wearer's skin starting from 54 and a pair of leak-proof cuffs 5 and 5, and absorbs at a position closer to the wearer's skin than the absorber 4. A front surface sheet 2 that overlaps with the body 4 and a back surface sheet 3 that is arranged on the non-skin facing surface side of the absorber 4 and overlaps with the absorber 4 at a position farther from the wearer's skin than the absorber 4 are provided. In a plan view as shown in the above, the central portion of the vertical direction X located at the lower crotch B is constricted inward and has a vertically long hourglass shape that is long in one direction, that is, the vertical direction X. The front surface sheet 2 and the back surface sheet 3 each have a size larger than that of the absorber 4 interposed between the two sheets 2 and 3, and form the outer shape of the unfolded and stretched diaper 1A as shown in FIG. ing. As the front surface sheet 2 and the back surface sheet 3, those usually used in this kind of absorbent article can be used without particular limitation. As the surface sheet 2, for example, a liquid-permeable hydrophilic non-woven fabric or perforated film can be used, and these non-woven fabrics and films are generally thermoplastic resins such as polyethylene and polypropylene and other polyolefin resins and polyethylene terephthalate. It is composed of polyester resin and the like. As the back sheet 3, for example, a liquid-impermeable film or a liquid-impermeable non-woven fabric can be used, and the liquid-impermeable film may have moisture permeability.

In the present specification, the "skin facing surface" is a surface of the absorbent article or its constituent member (for example, the surface sheet 2) that is directed toward the skin side of the wearer when the absorbent article is worn, that is, relatively worn. The side close to the skin of a person, and the "non-skin facing surface" is the surface of the absorbent article or its constituent members that is directed to the side opposite to the skin side (clothing side) when the absorbent article is worn, that is, relative to the skin. On the side far from the wearer's skin. In addition, "when worn" here means a state in which a normal proper wearing position is maintained.

The absorber 4 has a long shape in the vertical direction X in a plan view as shown in FIG. 1, and extends from the ventral side A to the dorsal side C. The absorber 4 includes a liquid-retaining absorbent core 40 containing an absorbent material, and a core wrap sheet 41 that covers the skin-facing surface and the non-skin-facing surface of the absorbent core 40. The absorbent core 40 and the core wrap sheet 41 are joined by a known joining means such as a hot melt type adhesive. In a plan view as shown in FIG. 1, the absorbent core 40 has an hourglass shape in which the central portion in the longitudinal direction, that is, the longitudinal direction X is constricted inward. The absorbent core 40 is formed by stacking core-forming materials including an absorbent material. As the absorbent material, those usually used as a material for forming this kind of absorbent core can be used without particular limitation. For example, hydrophilic fibers such as wood pulp and synthetic fibers treated with a hydrophilizing agent and water absorption can be used. Examples include sex polymer particles. The absorbent core 40 may be a laminated fiber of hydrophilic fibers, or a laminated fiber in which water-absorbing polymer particles are supported. As the core wrap sheet 41, a water-permeable sheet material can be used, and for example, paper, non-woven fabric, or the like can be used. In the diaper 1A, the core wrap sheet 41 is one continuous sheet having a width of 2 times or more and 3 times or less the length of the lateral Y of the absorbent core 40, and this one core wrap sheet 41. Covers the entire skin-facing surface of the absorbent core 40 and extends outward in the horizontal direction Y from both side edges along the vertical direction X of the absorbent core 40, as shown in FIG. The portion is wound below the absorbent core 40 to cover the entire non-skin facing surface of the absorbent core 40. The form of the core wrap sheet 41 is not limited to this, and for example, the skin-side core wrap sheet that covers the skin-facing surface of the absorbent core 40 and the non-skin-side that covers the non-skin-facing surface of the absorbent core 40. A core wrap sheet may be included, and both sheets may be separate sheets.

As shown in FIG. 1, a band-shaped elastic member 11 is provided in the lateral direction between the waist portion of each of the ventral side portion A and the dorsal side portion C, that is, between the front surface sheet 2 and the back surface sheet 3 at the end portion in the vertical direction X. It is fixed to Y in an extended state, whereby waist gathers are formed on the waist portion when the diaper 1A is worn due to the contraction of the elastic member 11. Further, a plurality of thread-like elastic members 12 are fixed in a laterally extended state between the front surface sheet 2 and the back surface sheet 3 in the waist circumference corresponding to the wearer's waist circumference in the dorsal side C. As a result, gathers around the waist are formed by the contraction of the elastic member 12 around the waist when the diaper 1A is worn. Further, a thread-like elastic member 13 is fixed in an extended state along the vertical direction X between the leakage-proof cuff forming sheet 50 and the back surface sheet 3 at the left and right leg portions arranged around the wearer's legs. As a result, a pair of leg gathers are formed on the leg portion when the diaper 1A is worn due to the contraction of the elastic member 13. The front surface sheet 2, the back surface sheet 3, the absorber 4, the sheet 50, and the elastic members 11 to 13 are joined to each other by a known joining means such as a hot melt type adhesive.

As shown in FIG. 1, a pair of fastening tapes 6 and 6 are provided on both side edges of the dorsal portion C of the diaper 1A along the vertical direction X. A fastening portion 61 made of a male member of a mechanical hook-and-loop fastener is attached to the fastening tape 6. Further, a landing region 7 made of a female member of a mechanical hook-and-loop fastener is formed on the non-skin facing surface of the ventral side A of the diaper 1A. In the landing region 7, a female member of a mechanical hook-and-loop fastener is attached to the non-skin facing surface of the back sheet 3 forming the non-skin facing surface of the ventral side A by a known joining means such as an adhesive or a heat seal. It is formed by joining and fixing, and the fastening portion 61 of the fastening tape 6 can be detachably fastened.

In the diaper 1A, as shown in FIG. 3, the hydrophilic skin care agent 10 is arranged on the surface sheet 2. In this way, by arranging the skin care agent 10 on the surface sheet 2 which is a part of the diaper 1A that can come into direct contact with the wearer's skin, skin troubles such as skin irritation of the wearer while wearing the diaper 1A can be caused. Can be effectively suppressed.

The arrangement pattern of the skin care agent 10 on the surface sheet 2 is not particularly limited, and for example, the skin care agent 10 may be evenly arranged over the entire skin-facing surface of the surface sheet 2, or the skin care agent 10 may be present on the skin-facing surface of the surface sheet 2. The skin care agent 10 may be arranged discontinuously so that a region and a non-existing region are formed. As an example of the latter discontinuous arrangement, a mode in which the existing area and the non-existing area of the skin care agent 10 extend in the vertical direction X with a predetermined width and both areas are alternately arranged in the horizontal direction Y can be exemplified. In addition, in FIG. 3, from the viewpoint of easy understanding, it is described that the skin care agent 10 is laminated on the skin-facing surface of the surface sheet 2, but it is not that such a laminated state is actually formed. Not limited to this, depending on the type of the skin care agent 10, the material of the surface sheet 2, and the like, the surface sheet 2 may include the skin care agent 10.

The method of arranging the skin care agent 10 on the surface sheet 2 is not particularly limited, and a known method can be appropriately selected depending on the type of the skin care agent 10 and the like. Typically, the skin of the surface sheet 2 is coated with a fluid skin care agent 10 prepared by dissolving it in a suitable solvent or heating it as needed, by applying, spraying, dipping or the like. Adhere to the facing surface. Examples of the means for adhering the skin care agent 10 include a die coater method, a slot spray method, a curtain spray method, a melt blown method, a spiral spray method, a gravure method, and a bead method.

The amount of the skin care agent 10 adhered to the surface sheet 2 may be appropriately selected within a range in which a sufficient skin care effect is exhibited according to the type of the skin care agent 10, and is not particularly limited, but the basis weight is preferably 0.05 g /. It is m ² or more, more preferably 0.1 g / m ² or more, and preferably 5.0 g / m ² or less, still more preferably 3.0 g / m ² or less.

A typical surface sheet 2 on which the skin care agent 10 is arranged is a hydrophobic non-woven fabric containing fibers composed of a thermoplastic resin, and the surface sheet 2 is often inherently hydrophobic. When the hydrophilic skin care agent 10 is attached to such a surface sheet 2, the surface sheet 2 can be subjected to a hydrophilic treatment prior to the attachment. Specifically, for example, when the surface sheet 2 is made of various non-woven fabrics, a hydrophilic agent is attached to the surface of the constituent fibers of the nonwoven fabric, or the hydrophilic agent is kneaded into the constituent fibers. , Hydrophilization treatment can be performed. That is, the surface sheet 2 may be a hydrophobic sheet material (for example, a hydrophobic non-woven fabric) that has been subjected to a hydrophilic treatment, and in that case, after the hydrophilic treatment, the surface of the constituent fibers of the surface sheet 2 is skin-care. The agent 10 may be attached. The basis weight of the surface sheet 2 is preferably 5 g / m ² or more, more preferably 10 g / m ² or more, and preferably 40 g / m ² or less, still more preferably 50 g / m ² or less.

The skin-facing surface of the surface sheet 2 is hydrophilic due to the arrangement of the hydrophilic skin care agent 10 and the like. In the present invention, the hydrophilicity of a sheet such as a surface sheet or a leak-proof cuff forming sheet, a spacer member described later, or a region having a predetermined area is evaluated based on the contact angle with water measured by the following method. The smaller the contact angle with water, the higher the hydrophilicity (lower hydrophobicity), and the larger the contact angle, the lower the hydrophilicity (higher hydrophobicity). Further, if the contact angle with water is less than 90 degrees, it is hydrophilic, and if it is 90 degrees or more, it is hydrophobic. Therefore, the contact angle of the hydrophilic surface sheet 2 with water on the skin-facing surface is less than 90 degrees, preferably 55 degrees or more and 85 degrees or less.

<Measurement method of contact angle>
The fibers are taken out from the constituent members (surface sheet, etc.) to be measured in the absorbent article, and the contact angle of water with respect to the fibers is measured. As a measuring device, an automatic contact angle meter MCA-J manufactured by Kyowa Interface Science Co., Ltd. is used. Distilled water is used to measure the contact angle. The amount of liquid discharged from the inkjet water droplet discharge unit (Pulse injector CTC-25 manufactured by Cluster Technology Co., Ltd., having a discharge unit hole diameter of 25 μm) is set to 20 picolitres, and water droplets are dropped directly above the fibers. The state of dripping is recorded on a high-speed recording device connected to a horizontally installed camera. From the viewpoint of image analysis later, the recording device is preferably a personal computer incorporating a high-speed capture device. In this measurement, an image is recorded every 17 msec. In the recorded video, the first image of water droplets on the fibers is the attached software FAMAS (software version is 2.6.2, analysis method is sessile drop method, analysis method is θ / 2 method, image processing algorithm. Is non-reflective, image processing image mode is frame, threshold level is 200, curvature correction is not performed), the angle between the surface of the water droplet that comes into contact with the air and the fiber is calculated, and the contact Make a corner. The fiber taken out from the object to be measured is cut to a fiber length of 1 mm, and the fiber is placed on a sample table of a contact angle meter and maintained horizontally. Measure the contact angles at two different points for each fiber. The contact angle of N = 5 fibers is measured to one digit after the decimal point, and the average value of the measured values at 10 points in total (rounded to the second digit after the decimal point) is defined as the contact angle of the fiber with water. The measurement environment is room temperature 22 ± 2 ° C. and humidity 65 ± 2% RH.

When measuring the contact angle, when a component such as a surface sheet to be measured is taken out from the absorbent article, the component is fixed to another component by an adhesive, fusion, or the like. Removes the fixed portion by applying a solvent, blowing hot air with a dryer, blowing a cold spray (for example, a commercially available product manufactured by Nichiban Co., Ltd.), and then taking out the fixed portion.

The skin care agent used in the present invention will be described. The skin care agent used in this kind of absorbent article includes a hydrophilic one and a hydrophobic one, and the skin care agent used in the present invention is hydrophilic. Since the skin care agent is hydrophilic, it has the effect of increasing the affinity for the skin.

As the skin care agent used in the present invention, those which are hydrophilic and have effects such as protection and healing on the wearer's skin can be used without particular limitation. For example, a preferred skin care agent includes a diamide derivative represented by the following formula (I). The diamide derivative represented by the following formula (I) is the diamide derivative of the invention described in International Publication No. WO00 / 61097, and has a medicinal effect of improving the water retention capacity and barrier function of the stratum corneum. ing. When the diamide derivative is transferred to the wearer's skin while wearing the diaper 1, it functions as an oil-based skin care agent and can suppress / improve skin irritation.

When the diamide derivative is used as a skin care agent, only one diamide derivative may be used, or two or more diamide derivatives may be used in combination.

As another hydrophilic skin care agent that can be used in the present invention, for example, a skin care agent used as an emollient agent in the field of cosmetics can be used. Specific examples of other hydrophilic skin care agents include liquid paraffin, silicone oil, animal and vegetable oils (olive oil, hooba oil, benibana oil, squalane and squalane, etc.), monoglyceride, diglyceride, triglyceride, aliphatic ethers (myristyl-1, myristyl-1,). 3-Dimethylbutyl ether, palmitol-1,3-dimethylbutyl ether, stearyl-1,3-dimethylbutyl ether, palmityl-1,3-methylpropyl ether, stearyl-1,3-methylpropyl ether, etc.), isostearyl-cholesterol ester , Paraffin wax, C _{12 to} C ₂₂ fatty acids, C _{12 to} C ₄₄ fatty acid ethers, C _{12 to} C ₂₂ fatty alcohols, vaseline, fatty acid sorbitan esters (any of monoesters, diesters, and triesters), polyoxy Ethylene fatty acid sorbitan ester (any of monoester, diester, and triester), metal stone test (magnesium stearate, etc.), sucrose fatty acid ester, cyclodextrin fatty acid ester, silicone, silicone resin, JP-A-2004- Examples thereof include an emollient agent used in the invention described in Japanese Patent Application Laid-Open No. 298643 or Japanese Patent Application Laid-Open No. 2008-522772, and a lotion composition containing an emollient agent and an immobilizing agent. The various hydrophilic skin care agents may be used alone or in combination of two or more.

Among the various hydrophilic skin care agent, a mixture of diamide derivatives of C ₁₂ -C ₂₂ fatty alcohols (preferably stearyl alcohol) and the formula (I), top sheet when placed in the topsheet It is preferable because it does not interfere with the permeability of the body fluid. From the viewpoint of transferability of the skin care agent to the skin, skin care effect, feel during use, and body fluid permeability of the surface sheet, the mixed mass ratio of stearyl alcohol and the diamide derivative of the above formula (I) is stearyl alcohol / diamide. The derivative is preferably in the range of 90/10 to 50/50. It is preferable that the mixture is heated to increase its fluidity and then applied and adhered on the surface sheet. Further, after adhering the mixture to the surface sheet 2, it is preferable to leave the mixture at room temperature to reduce the fluidity of the mixture so that it can be easily held on the surface sheet.

When arranging the skin care agent on the surface sheet, various coating methods can be used without particular limitation. For example, a die coater method, a slot spray method, a curtain spray method, a melt blown method, a spiral spray method, and a gravure method can be used. , Bead method and the like.

Explaining the leakage-proof cuff 5, which is one of the main feature portions of the diaper 1A, the pair of leakage-proof cuffs 5 and 5 are continuous 1 over the entire length of the diaper 1A in the vertical direction X, respectively, as shown in FIG. A sheet 50 for forming a leak-proof cuff, and one or a plurality of (two in the illustrated embodiment) elastic member 53 for forming a leak-proof cuff fixed to the sheet 50 in a vertically extending state. Is configured to include.

As shown in FIGS. 2 and 3, the leakage-proof cuff forming sheet 50 is arranged so as to straddle the side edge 4S along the vertical direction X of the absorber 4 in the horizontal direction Y, and the inner edge portion along the vertical direction X. In the plan view of the diaper 1A in the expanded and extended state as shown in FIG. 1, it has 55 and an outer edge portion 56 located outside the inner edge portion 55 in the lateral direction Y and along the vertical direction X. The inner edge portion 55 overlaps with the absorber 4, and the outer edge portion 56 is located outside the side edge 4S of the absorber 4 in the lateral direction Y. The inner edge portion 55 is a diaper 1A including a surface sheet 2 at least in the inseam B, specifically, for example, in the inseam B and the portion of the ventral side A and the dorsal side C near the crotch B. It is a free end portion that is not joined to other constituent members, and is joined to the surface sheet 2 at the front and rear ends of the ventral side portion A and the dorsal side portion C in the vertical direction X (not shown). The outer edge portion 56 is joined to another member (back surface sheet 3 in the illustrated form) constituting the diaper 1A over the entire length in the vertical direction X. The leak-proof cuff forming elastic member 53 is fixed to the inner edge portion 55 (free end portion) of the sheet 50 in a state of being extended in the vertical direction X. With the above configuration, when the diaper 1A is worn, the contraction force of the elastic member 53 acts in the vertical direction X, and the leakage-proof cuff 5 is provided at least in the inseam B, which is a region where the inner edge portion 55 is a free end portion. As shown in FIG. 4, starting from the fixing portion 54 with another member (back surface sheet 3) of the sheet 50, the inner edge portion 55 side stands up toward the skin of the wearer (not shown). As described above, the leak-proof cuff 5 has an upright portion 5S that stands up toward the wearer's skin starting from the fixing portion 54 with other members. The upright portion 5S is a portion of the leak-proof cuff 5 that is not fixed to other members.

As the leak-proof cuff forming sheet 50, a sheet material in which a part (one side) is hydrophilic can be used, but typically, a sheet material in which all (both sides) are hydrophobic is used. As the hydrophobic sheet material, for example, as the hydrophobic non-woven fabric, air-through non-woven fabric, spunbonded non-woven fabric, SMS non-woven fabric, SMMS non-woven fabric, SSMS non-woven fabric and the like can be used. In addition, a hydrophobic resin film and the resin thereof can be used. A laminate of the film and the non-woven fabric or the like can be used. Here, "S" means a spunbonded non-woven fabric, and "M" means a melt-blown non-woven fabric. At least a part (one side) of the leak-proof cuff forming sheet 50 is hydrophobic, and the contact angle of the hydrophobic portion with water measured by the above method is 90 degrees or more.

As described above, the fixing portion 54 with the other member of the leak-proof cuff forming sheet 50 (the back surface sheet 3 in the illustrated form) serves as a starting point when the leak-proof cuff 5 (sheet 50) stands up. It has a predetermined length in the horizontal direction Y and extends in the vertical direction X. In the diaper 1A, the fixing portion 54 is formed by applying a hydrophobic adhesive such as a hot melt adhesive, and forms a continuous linear shape extending in the vertical direction X in a plan view as shown in FIG. The fixed portion 54 may extend in the vertical direction X in a plan view, and its plan view shape is not limited to a straight line, and may be, for example, a wavy line, a curved line, a zigzag line, or one. It does not have to be a continuous line, and may be a break line having a configuration in which small fixed portions and non-fixed portions having a relatively short length are alternately arranged in the vertical direction X.

As shown in FIG. 3, the standing portion 5S that is not fixed to the other members in the leak-proof cuff 5 is shown in FIG. 1 when the standing portion 5S is laid down on the surface sheet 2 side, that is, inside the lateral direction Y. In a plan view of the diaper 1A as shown in the above, the diaper 1A has a tip portion 5S1 overlapping the absorber 4 and a base end portion 5S2 located between the tip portion 5sS1 and the fixing portion 54. In the inverted state of the upright portion 5S as shown in FIG. 3, the tip portion 5S1 extends inward in the lateral direction Y from the side edge 4S of the absorber 4, and the base end portion 5S2 does not overlap with the absorber 4. It is continuous from the side edge 4S to the fixing portion 54. The side edge 4S of the absorber 4 serves as a boundary between the tip portion 5S1 and the base end portion 5S2 in the upright portion 5S in a state of being laid down on the surface sheet 2 side.

As shown in FIG. 3, the base end portion 5S2 of the upright portion 5S is attached to the inner sheet 51 arranged at a position relatively close to the absorber 4 and to the inner sheet 51 at a position relatively far from the absorber 4. It is configured to include an outer sheet 52 arranged to face each other. In the diaper 1A, not only the base end portion 5S2 but also the tip end portion 5S1 includes both sheets 51 and 52 as in the base end portion 5S2. Both sheets 51 and 52 may be hydrophobic on at least one side and hydrophobic on both sides, respectively.

In the diaper 1A, the leak-proof cuff forming sheet 50 is composed of one strip-shaped sheet as shown in FIG. 3, and the strip-shaped sheet is folded in half in the horizontal direction Y by a folding curve (not shown) extending in the vertical direction X. The folded curve side (free end side) is the inner edge portion 55 of the leak-proof cuff 5, and the side opposite to the folded line side, that is, the side edge side (fixed end side) along the vertical direction X of the strip-shaped sheet is leak-proof. Where the outer edge portion 56 of the cuff 5 is used, the inner sheet 51 and the outer sheet 52 are each a part of one sheet 50 (strip-shaped sheet), and both sheets 51 and 52 are continuous 1 It constitutes a sheet 50.

As one of the main features of the diaper 1A, as shown in FIGS. 2 to 4, both sheets 51 and 52 are separated from each other in the thickness direction between the inner sheet 51 and the outer sheet 52 at the base end portion 5S2. The point that the separating portion 58 exists can be mentioned. The separation portion 58 may be present at least in the inseam B and further in the ventral side A and / or the dorsal side C.

In the diaper 1A, as shown in FIGS. 3 and 4, a hydrophobic spacer member 8 is partially arranged between the inner sheet 51 and the outer sheet 52 at the base end portion 5S2, and between the two sheets 51 and 52. There is a separation portion 58 in the non-arranged portion of the spacer member 8 in the above. The spacer member 8 may be fixed to the inner sheet 51, the outer sheet 52, or both the sheets 51 and 52.

The spacer member 8 has a continuous linear shape extending in the vertical direction X in the plan view of the diaper 1A as shown in FIG. 1, and in the illustrated form, three linear spacer members 8 are laterally formed at the base end portion 5S2. It is intermittently arranged in the direction Y. The spacer member 8 has a predetermined thickness in the thickness direction of the sheets 51 and 52. By arranging a plurality of spacer members 8 between the two sheets 51 and 52 facing each other in this way, at least between the two adjacent spacer members 8 and 8 (non-arranged portion of the spacer member 8). In addition, a separating portion 58 is formed in which both sheets 51 and 52 are separated from each other in the thickness direction.

Due to such a characteristic configuration of the leak-proof cuff 5, the leakage of excrement caused by the skin care agent 10 arranged on the surface sheet 2 adhering to the upright portion 5S of the leak-proof cuff 5, particularly the proximal end portion 5S2. Is effectively suppressed. That is, the hydrophilic skin care agent 10 adheres to the surface sheet 2 side, that is, the inner sheet 51 of the base end portion 5S2, which is inherently hydrophobic at least on one side, so that the hydrophobicity of the adhered portion decreases. Even if there is a concern that excrement may leak to the outside of the diaper 1A from the portion where the hydrophobicity is lowered, the proximal end portion 5S2 includes two hydrophobic layers, an inner sheet 51 and an outer sheet 52. Even if the skin care agent 10 adheres to the inner sheet 51, the outer sheet 52 having a hydrophobic layer is arranged on the outside in the lateral direction Y, so that the hydrophobicity-reduced portion (skin care agent) of the inner sheet 51 is arranged. The excrement that has passed through the attachment portion of 10) is blocked by the outer sheet 52. Further, the base end portion 5S2 is formed with a separation portion 58 which is a space portion where the two sheets 51 and 52 do not come into contact with each other, and in this separation portion 58, excrement is transferred from the inner sheet 51 to the outer sheet 52. Since it is unlikely to occur, the amount of excrement adhering to the outer sheet 52 is suppressed, and in combination with the effect of blocking the excrement by the outer sheet 52, the excrement extends beyond the outer sheet 52 to the outside of the diaper 1A. The inconvenience of leaking is effectively prevented.

Further, in the diaper 1A, the stability of the separating portion 58 is further improved by arranging the hydrophobic spacer member 8 between the inner sheet 51 and the outer sheet 52 at the base end portion 5S2. , Leakage prevention of excrement is made more effectively and stably. Further, if the spacer members 8 are evenly arranged between the sheets 51 and 52 at the base end portion 5S2, the flexibility of the leak-proof cuff 5 is impaired, and as a result, the function of the leak-proof cuff 5 may deteriorate. Although there is concern, in the diaper 1A, since the spacer member 8 is partially arranged at the base end portion 5S2, such a concern is dispelled. Further, since the non-arranged portion of the spacer member 8 in the base end portion 5S2 including the separation portion 58 can also function as a space for taking in excrement, the surface sheet 2 and the leak-proof cuff 5 (inner sheet 51) are used. The amount of excrement accumulated during the period is reduced, and the diffusion of excrement is effectively suppressed.

As described above, both sheets 51 and 52 need only be hydrophobic on at least one side. For example, with respect to the inner sheet 51, the outer surface (surface sheet 2 side) is hydrophilic and the inner surface (outer sheet 52 side) is hydrophobic. However, the former form is preferable when the inner sheet 51 has both a hydrophilic surface and a hydrophobic surface as described above. When the surface of the inner sheet 51 on the surface sheet 2 side is hydrophilic and the surface on the outer sheet 52 side is hydrophobic, the exudation of the skin care agent 10 transferred from the surface sheet 2 to the outer sheet 52 side is even more effective. Is suppressed.

As the spacer member 8, a hydrophobic member useful for forming and maintaining the separating portion 58 can be used, and examples thereof include a hydrophobic adhesive such as a hydrophobic hot melt adhesive. That is, the spacer member 8 can be formed by partially applying the hydrophobic adhesive between the inner sheet 51 and the outer sheet 52 at the base end portion 5S2. Other examples of the spacer member 8 include a hydrophobic non-woven fabric, a resin film, and a composite material obtained by laminating a non-woven fabric and a resin film.

From the viewpoint of ensuring the action and effect of the spacer member 8 to be exerted more reliably, it is preferable to set the dimensions and the like of each part of the spacer member 8 as follows.
The length (thickness of the spacer member 8) 81 (see FIG. 4) of the spacer member 8 in the thickness direction of the leakage-proof cuff forming sheet 50 (sheets 51 and 52) is preferably 0.1 mm or more, more preferably 0. It is .3 mm or more, preferably 2.5 mm or less, and more preferably 2.0 mm or less.
The length 82 (see FIG. 4) of the spacer member 8 in the leak-proof cuff width direction Y1 is preferably 0.1 mm or more, more preferably 0.3 mm or more, and preferably 5.0 mm or less, further preferably 3. It is 0 mm or less. The leakage-proof cuff width direction Y1 is a direction orthogonal to the longitudinal direction of the leakage-proof cuff 5 (leakage-proof cuff forming sheet 50).
The distance 83 (see FIG. 4) between the two adjacent spacer members 8 and 8, that is, the length of the separation portion 58 in the leak-proof cuff width direction Y1 is preferably 1.0 mm or more, more preferably 2.0 mm or more. Then, it is preferably 5.0 mm or less, more preferably 4.0 mm or less.
The number of spacer members 8 arranged along the leakage-proof cuff width direction Y1 in the leakage-proof cuff 5 (base end portion 5S2) on one side is, for example, 3 in FIG. 4, but is preferably 3 or more. It is more preferably 5 or more, preferably 20 or less, still more preferably 15 or less.

Hereinafter, other embodiments of the absorbent article of the present invention will be described with reference to FIGS. 5 to 10. Regarding other embodiments described later, components different from the diaper 1A of the above-described embodiment will be mainly described, and similar components will be designated by the same reference numerals and description thereof will be omitted. The description of the diaper 1A is appropriately applied to the components not particularly described.

In the diaper 1A, the outer edge 56 of the leak-proof cuff 5 was located outside the lateral edge 4S of the absorber 4 in the lateral direction (see FIG. 3 and the like), but in the diaper 1B shown in FIG. The outer edge 56 of the leak-proof cuff 5 and its vicinity are arranged between the absorber 4 and the back surface sheet 3, and the outer edge 56 is inside the lateral edge 4S of the absorber 4 in the lateral direction Y. It is located in the direction. In the diaper 1B, the portion of the leak-proof cuff 5 (leak-proof cuff forming sheet 50) arranged between the absorber 4 and the back surface sheet 3 is such that the standing portion 5S stands up toward the wearer's skin. It functions as a fixing portion 54 at the time. That is, in the diaper 1B, the fixing portion 54 of the leakage-proof cuff 5 with other members overlaps with the absorber 4 in a plan view as shown in FIG. 1, and at this point, the fixing portion 54 is a side edge of the absorber 4. It is different from the diaper 1A (see FIG. 3) located outside the lateral direction Y from 4S. The diaper 1B also produces the same effect as the diaper 1A.

In the diaper 1C shown in FIG. 6, the water-absorbent material 9 is arranged between the inner sheet 51 and the outer sheet 52 at the base end portion 5S2. The water-absorbent material 9 has a long strip in one direction in a plan view, and both sheets are interposed between 51 and 52 so that the longitudinal direction thereof coincides with the vertical direction X. The water-absorbent material 9 is fixed to the inner surface of the inner sheet 51 (the surface facing the outer sheet 52) and is arranged in non-contact with the outer sheet 52. A separation portion 58 exists between the water-absorbent material 9 and the outer sheet 52.

An example of the water-absorbent material 9 is a sheet-shaped absorption structure containing a water-absorbent material such as a water-absorbent polymer and a hydrophilic fiber. Examples thereof include an absorbent sheet formed into a sheet by bonding between the constituent fibers and between the constituent fibers and the water-absorbing polymer via a binder such as an added adhesive or an adhesive fiber. The absorbent sheet may be composed of only hydrophilic fibers such as wood pulp without containing a water-absorbing polymer. The thickness of the absorbent sheet as the water-absorbent material 9 under no load is preferably 0.5 mm or more, more preferably 0.8 mm or more, and preferably 2.0 mm or less, further preferably 1.5 mm or less. ..

The diaper 1C also produces the same effect as the diaper 1A. In particular, in the diaper 1C, since the surface hydrophobic water-absorbing material 9 is arranged between the inner sheet 51 and the outer sheet 52 in the base end portion 5S2, the stability of the separating portion 58 is excellent and the water-absorbing portion is excellent. Since the material 9 itself can absorb the excrement, the transfer of the excrement from the inner sheet 51 to the outer sheet 52 is unlikely to occur, and the skin care agent 10 arranged on the surface sheet 2 adheres to the leak-proof cuff 5. , Leakage of excrement is effectively suppressed.

In the diaper 1D shown in FIG. 7, a water-absorbent material 9 and a plurality (three) spacer members 8 are arranged between the inner sheet 51 and the outer sheet 52 in the base end portion 5S2 in order from the sheet 51 side. There is. A separating portion 58 exists between the adjacent spacer members 8 and 8. The spacer member 8 may be fixed to the water-absorbent material 9, the outer sheet 52, or both the water-absorbent material 9 and the outer sheet 52. The diaper 1D also produces the same effect as the diaper 1A. In particular, in the diaper 1D, since the water-absorbent material 9 and the spacer member 8 are arranged between the two sheets 51 and 52, the transfer of excrement from the inner sheet 51 to the outer sheet 52 is effectively hindered and leakage-proof. It is particularly excellent in preventing the leakage of excrement from the cuff 5.

The diaper 1E shown in FIG. 8, the diaper 1F shown in FIG. 9, and the diaper 1G shown in FIG. 10 are all surfaces of the inner sheet 51 of the base end portion 5S2 opposite to the outer sheet 52, that is, the sheet 51. The outer surface of the diaper is characterized by having irregularities 59. As described above, when the outer surface of the inner sheet 51 is an uneven surface, the upright portion 5S of the leak-proof cuff 5 is laid down toward the surface sheet 2 side as compared with the case where the outer surface of the sheet 51 is a flat surface without unevenness. When the sheet 51 comes into contact with the surface sheet 2, the contact area of the sheet 51 with the surface sheet 2 is reduced, so that the transfer of the skin care agent 10 arranged on the surface sheet 2 to the sheet 51 is suppressed, and as a result. As a result, the leakage of excrement from the leak-proof cuff 5 is effectively suppressed. Further, it can be expected that the flexibility of the leak-proof cuff 5 (standing portion 5S) is improved by providing the inner sheet 51 with the unevenness 59. As a method of imparting unevenness 59 to the inner sheet 51, for example, a raw sheet for an inner sheet having no unevenness is provided between a pair of tooth groove rolls in which teeth and tooth bottoms are alternately formed in the circumferential direction. There is a method to introduce it.

In the diaper 1E shown in FIG. 8, other members such as the spacer member 8 and the water-absorbent material 9 are not arranged between the inner sheet 51 and the outer sheet 52 at the base end portion 5S2, and both sheets 51, There is a separation portion 58 between the 52.
In the diaper 1F shown in FIG. 9, a plurality of spacer members 8 (three in the illustrated embodiment) are arranged between the inner sheet 51 and the outer sheet 52 at the base end portion 5S2, and are located in the vicinity of the plurality of spacer members 8. The separation portion 58 exists.
In the diaper 1G shown in FIG. 10, the water-absorbent material 9 is fixed to the inner surface of the inner sheet 51 at the base end portion 5S2, and a separation portion 58 exists between the water-absorbent material 9 and the outer sheet 52.

Although the present invention has been described above based on the embodiment, the present invention can be appropriately modified without being limited to the embodiment. For example, from the viewpoint of improving absorbency and leakage resistance, a liquid permeable sheet made of paper or various non-woven fabrics, which is also called a sublayer, is formed between the surface sheet 2 and the absorber 4 (core wrap sheet 41). It may be intervened. From the same viewpoint, a groove formed by integrally compacting the surface sheet 2 and the absorber 4 may be formed on the skin-facing surface of the diaper 1.
The present invention is not limited to the deployable disposable diapers as in the above embodiment, and broadly includes articles used for absorbing body fluids (urine, loose stools, menstrual blood, sweat, etc.) discharged from the human body, and is of a pants type. Disposable diapers, sanitary napkins, sanitary shorts and the like are also included.
All the parts of only one embodiment described above can be mutually used as appropriate.

1A, 1B, 1C, 1D, 1E, 1F, 1G Expandable disposable diapers (absorbent articles)
2 Front sheet 3 Back sheet 4 Absorber 4S Side edge of absorber 5 Leakage cuff 5S Standing part 5S1 Tip 5S2 Base end 50 Leakage cuff forming sheet 51 Inner sheet 52 Outer sheet 53 Leakage cuff forming elastic member 54 Fixed part 55 Inner edge of leak-proof cuff forming sheet 56 Outer edge of leak-proof cuff forming sheet 57 Overlapping part with side edge of absorber in leak-proof cuff 58 Separation part 59 Concavo-convex 8 Spacer member 9 Water absorption Material 10 Skin care agent A Ventral side B Crotch part C Dorsal side X Vertical direction Y Horizontal direction

Claims (5)

It has a vertical direction corresponding to a direction extending from the ventral side of the wearer to the dorsal side through the crotch portion and a lateral direction orthogonal to the vertical direction, and a liquid-retaining absorber and both sides along the vertical direction of the absorber. A pair of leak-proof cuffs having a standing portion that stands up toward the wearer's skin starting from a fixed portion with another member, and an absorber that is arranged between the pair of leak-proof cuffs. An absorbent article comprising a surface sheet that overlaps the absorber at a position closer to the wearer's skin.
A hydrophilic skin care agent is arranged on the surface sheet,
The upright portion has a tip portion that overlaps with the absorber in a plan view when the upright portion is laid down on the surface sheet side, and a base end portion that is located between the tip portion and the fixed portion. death,
The base end portion is configured to include an inner sheet arranged at a position relatively close to the absorber and an outer sheet arranged to face the inner sheet at a position relatively far from the absorber. And
Wherein the outer sheet is a single-sided hydrophobic even without a small,
The inner sheet has a hydrophilic surface on the surface sheet side and a hydrophobic surface on the outer sheet side.
An absorbent article in which a separating portion in which both sheets are separated from each other in the thickness direction exists between the inner sheet and the outer sheet. A hydrophobic spacer member made of a hydrophobic adhesive is partially arranged between the inner sheet and the outer sheet, and the separation portion exists in a non-arranged portion of the spacer member between the two sheets. The absorbent article according to claim 1. The absorbent article according to claim 1 or 2, wherein a water-absorbent material is arranged between the inner sheet and the outer sheet. The absorbent article according to claim 3, wherein the water-absorbent material is fixed to the inner sheet and arranged in a non-contact manner with respect to the outer sheet. The absorbent article according to any one of claims 1 to 4, wherein the surface of the inner sheet opposite to the surface facing the outer sheet has irregularities.

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