JP2020146133A - Absorbent article - Google Patents

Abstract

To provide an absorbent article capable of heightening persistence of an effect generated by a skin care agent.SOLUTION: An absorbent article includes a surface sheet on the skin contact surface side, a rear surface sheet on the skin noncontact surface side, and an absorber interposed between the surface sheet and the rear surface sheet. In the absorbent article, the surface sheet includes a projection containing a skin care agent on the skin contact surface side, and the projection has two ridge parts and a hollow part sandwiched by the two ridge parts in a cross sectional view in a thickness direction, and more skin care agent is arranged on the hollow part than on the ridge parts.SELECTED DRAWING: Figure 1

Description

The present invention relates to absorbent articles such as diapers and sanitary napkins.

For absorbent articles such as diapers and sanitary napkins, techniques for reducing skin problems of the wearer have been proposed.
For example, Patent Document 1 describes an absorbent article in which a skin care agent is applied to the skin contact surface side of a surface sheet having a high-density portion and a low-density portion. Further, in the absorbent article described in Patent Document 2, it is described that a raised portion is formed on the laminated surface sheet and a high-density portion is formed on the raised portion in order to reduce skin troubles due to breathability.

Japanese Unexamined Patent Publication No. 2011-131544 Japanese Unexamined Patent Publication No. 2006-263296

The skin care agent applied to the surface sheet migrates to the skin and exerts its effect. The skin care agent can be sufficiently transferred to the skin at the initial stage of wearing the absorbent article, but the skin care agent remaining on the surface sheet decreases with the passage of wearing time and excretion. Therefore, conventionally, as the wearing time is extended, the amount of the skin care agent transferred to the skin is reduced due to the influence of excretion, and the skin care effect is likely to be diminished.
In view of the above points, the present invention relates to the provision of an absorbent article capable of enhancing the sustainability of the effect of the skin care agent.

The present invention is an absorbent article comprising a front surface sheet on the skin contact surface side, a back surface sheet on the non-skin contact surface side, and an absorber interposed between the front surface sheet and the back surface sheet. The surface sheet has a convex portion containing a skin care agent on the skin contact surface side, and the convex portion has two peaks and a recess sandwiched between the two peaks in a cross-sectional view in the thickness direction. Provide an absorbent article having a skin care agent in the recessed portion in a larger amount than the peak portion.

The absorbent article of the present invention can enhance the sustainability of the effect of the skin care agent.

It is a partial notch plan view which developed the tape type diaper as one Embodiment of this invention and was seen from the skin contact surface side. It is an enlarged cross-sectional view along the line II-II of FIG. 1, and the figure in the circle indicated by reference numeral P is an enlarged cross-sectional view of a convex portion. (A) is a cross-sectional view showing a state in which the convex portion is inclined and raised at an angle, and (B) is a cross-sectional view showing a state in which the convex portion is bent in the middle of the uplift. It is a partially enlarged perspective view which shows the aspect which the convex part has the shape of a truncated cone. It is one cross-sectional perspective view which shows the aspect which the convex part has a streak shape. It is sectional drawing which shows the aspect which the surface sheet comprises the 1st nonwoven fabric and the 2nd nonwoven fabric. It is sectional drawing which shows the aspect which the surface sheet has a high convex part and a low convex part. FIG. 5 is a plan view showing a partially enlarged arrangement pattern when a convex portion having a recessed portion on which a skin care agent is arranged is arranged on the entire surface sheet. (A) is a plan view showing a partially enlarged arrangement pattern in which convex portions having recessed portions on which skin care agents are arranged are scattered in a grid pattern in the plane direction of the surface sheet, and (B) and (C) are shown. Is a plan view showing a partially enlarged arrangement pattern in which rows of convex portions having recessed portions on which skin care agents are arranged are arranged in the longitudinal direction Y and are intermittently arranged in the width direction X. FIG. 3 is a plan view showing an embodiment in which a row of convex portions having recessed portions in which a skin care agent is arranged is arranged in a plurality of striped regions in the surface sheet of the diaper shown in FIG.

Hereinafter, the diaper 10 as a preferred embodiment of the absorbent article according to the present invention will be described with reference to the drawings. Although the diaper 10 is shown as a tape type in FIG. 1, it is not limited to this, and may be, for example, a pants type.

In the present invention, the side in contact with the skin of the wearer is referred to as the skin surface side or the skin contact surface side or the front surface side, and the opposite side is referred to as the non-skin surface side or the non-skin contact surface side or the back surface side. These are also used as terms indicating the relative positional relationship in the member composition of the absorbent article even for the member having no surface in contact with the wearer's skin. In addition, the direction located on the front side of the wearer when worn is referred to as the front, and the direction located on the rear side is referred to as the rear. The normal direction of the front or back surface of the absorbent article is called the thickness direction. The front side is the ventral side of the wearer, and the posterior side is the back side of the wearer.

FIG. 1 shows a state in which the diaper 10 of the present embodiment is unfolded and viewed in a plan view from the skin contact surface side. In this state, the diaper 10 is divided into anterior side F, inseam C and posterior R arranged on the front side, inseam and posterior side of the wearer, respectively, and the front side F, inseam C and posterior side portion. It has a longitudinal direction Y corresponding to the direction in which R is connected and a width direction X orthogonal to the longitudinal direction Y.

The diaper 10 is composed of a front surface sheet 1 arranged on the skin contact surface side, a leak-proof back surface sheet 2 arranged on the non-skin contact surface side, and between the front surface sheet 1 and the back surface sheet 2. It has an absorber 3 interposed in the body.
The surface sheet 1 is made of a liquid-permeable soft material, and is preferably made of, for example, a hydrophilic non-woven fabric. In the present embodiment, the surface sheet 1 will be described as being made of a hydrophilic non-woven fabric.
The absorber 3 has an aggregate of an absorbent material for excrement liquid (hereinafter, also referred to as an absorbent core), and has, for example, an aggregate of pulp fibers or an aggregate of pulp fibers and a superabsorbent polymer material. From the viewpoint of shape retention, the absorbent core is preferably covered with a hydrophilic coating sheet (not shown). The back sheet 2 is preferably made of a leak-proof member, for example, a breathable breathable film laminated with a non-woven fabric having a comfortable exterior.

In the present embodiment, a pair of side sheets 8 and 8 are arranged on the skin contact surface side of the surface sheet 1 from both sides in the longitudinal direction Y toward the left and right outside in the width direction X. The diaper 10 has an outer shape in which the crotch portion C is constricted and the front side portion F and the rear side portion R project in the width direction. The overhanging portions of the front side portion F and the rear side portion R form a pair of left and right front side flaps 10A and a rear side flap 10B. Fastening tapes 9 and 9 used for fixing the diaper 10 to the body at the time of wearing are arranged on the outer edges of the rear side flaps 10B in the width direction, respectively.

Next, the surface sheet 1 will be described in detail.
The surface sheet 1 is provided with a convex portion 6 on the skin contact surface side. The surface sheet 1 of the present embodiment includes a concave-convex structure 5 having a plurality of convex portions 6 and concave portions 7 between the convex portions 6 and 6. In the concave-convex structure 5, a plurality of convex portions 6 and 7 concave portions are alternately arranged in the plane direction on the skin contact surface side of the surface sheet 1. The convex portion 6 may be in the entire region of the surface sheet 1 on the skin contact surface side, or may be in a partial region. It is preferable that the convex portion 6 is arranged at least in the region where the surface sheet touches the wearer's skin. For example, as shown in FIG. 1, a region where the surface sheet 1 is not covered by the pair of side sheets 8 and 8 and is exposed on the skin contact surface side (the surface of the diaper 10 at a predetermined width from the center L in the width direction X). It is preferable that the convex portion 6 is arranged on M1 (a region extending over the longitudinal direction Y of the sheet 1). In the longitudinal direction Y, the convex portion 6 is preferably arranged in the region where the absorber 3 exists, and is arranged at least in a region covering the buttocks from the excretion site (a region 200 mm across the center in the longitudinal direction of the product). It is more preferable to have. Further, it is preferable that the uneven structure 5 including the convex portion 6 is also arranged in the above range. This facilitates the transfer of the agent to a site where skin troubles are likely to occur, and makes it easier to effectively care for the site. In the present invention, the number of convex portions is not limited to that of the above embodiment, and may be appropriately determined according to the size, shape, etc. of the absorbent article, and may be one, or two or more. There may be.

As shown in FIG. 2, the skin care agent 4 is contained on the convex portion 6. The “above the convex portion 6” means the surface of the convex portion 6 (the surface facing the skin contact surface side).

式中、Ｒ^１は、ヒドロキシ基及び／又はアルコキシ基が置換していてもよい、炭素数１〜２２の直鎖又は分岐鎖の炭化水素基を示し、Ｒ^２は、炭素数１〜１２の直鎖又は分岐鎖の二価の炭化水素基を示し、Ｒ^３は、炭素数１〜４２の直鎖又は分岐鎖の二価の炭化水素基を示す。 The skin care agent used in the present invention will be described. As the skin care agent used in the present invention, those having 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. WO 00/61097, 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 absorbent article, it functions as an oily skin care agent and can suppress / improve skin irritation.

In the formula, R ¹ represents a linear or branched hydrocarbon group having 1 to 22 carbon atoms, which may be substituted with a hydroxy group and / or an alkoxy group, and R ² has 1 to 12 carbon atoms. It represents a linear or branched divalent hydrocarbon group, R ³ represents a linear or branched divalent hydrocarbon group having 1 to 42 carbon atoms.

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 other skin care agents that can be used in the present invention, for example, skin care agents used as emollients in the field of cosmetics can be used. Specific examples of other skin care agents include liquid paraffin, silicone oil, animal and vegetable oils (olive oil, hooba oil, benivana oil, squalane and squalane, etc.), monoglyceride, diglyceride, triglyceride, aliphatic ethers (myristyl-1,3-dimethyl). Butyl ether, palmityl-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 , C12-C22 fatty acids, C12-C44 fatty acid ethers, C12-C22 fatty alcohols, vaseline, fatty acid sorbitan esters (any of monoesters, diesters, and triesters), polyoxyethylene fatty acid sorbitan esters (monoesters, diesters). , And triester), metal stone test (magnesium stearate, etc.), sucrose fatty acid ester, cyclodextrin fatty acid ester, silicone, silicone-based resin, JP-A-2004-298643 or Japanese Patent Application Laid-Open No. 2008-522772. Examples thereof include an emollient agent used in the invention described in Japanese Patent Publication No., 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.

A preferred embodiment of the skin care agent is a solid state having low fluidity that tends to stay on the convex portion before wearing, and becomes a semi-solid by heating due to body temperature or the like at the time of wearing to generate fluidity. As a result, it is possible to more effectively realize the continuous transfer of the skin care agent in the structure of the convex portion 6 described later.

The convex portion 6 is raised toward the skin contact surface side. As a relative positional relationship along the rising direction of the convex portion 6, the side closer to the position where it touches the skin is called the upper side, and the side farther from the position is called the lower side. Further, the ridge height H1 of the convex portion 6 is divided into two equal parts, and the portion closer to the position where it touches the skin is classified as the upper portion 6T, and the portion below the upper portion 6T is classified as the root portion 6N. The "raised height H1 of the convex portion 6" is the thickness from the highest portion to the lowest portion of the surface of the convex portion 6 on the skin contact surface side in the side view (or cross-sectional view in the thickness direction) of the convex portion 6. Say the distance in the direction. For this distance, for example, by observing the cross section in the thickness direction using a digital microscope (manufactured by KEYENCE CORPORATION), the peak portion 61 of the convex portion 6, that is, the highest portion to the lowest portion of the surface on the skin contact surface side is observed. It can be measured by the height at the shortest distance in the thickness direction. The above-mentioned "cross-sectional view in the thickness direction" means observing a cross section cut in a plane along the thickness direction of the surface sheet 1 from a direction orthogonal to the cross section.

As shown in FIG. 2, the convex portion 6 has two peak portions 61 and a recessed portion 62 sandwiched between the two peak portions 61 in a cross-sectional view in the thickness direction. It should be noted that the above specification is a cross section in the thickness direction passing through the recessed portion 62 among various cross sections in the thickness direction that can be taken with respect to the convex portion 6, and the above requirements (two peak portions 61 and two peak portions 61). It means that there is at least one cross section that satisfies the requirement) of the recessed portion 62 sandwiched between the two. Therefore, it is not necessary to satisfy the above requirements for all possible cross sections.
The peak portion 61 and the recess portion 62 are arranged in the upper portion 6T of the convex portion 6. It is preferable that the peak portion 61 and the recess portion 62 are located in the upper portion 6T in contact with the wearer's skin. Specifically, in each convex portion 6, it is preferable that at least a part of the peak portion 61 is positioned at the highest position of the raised height H1 of the convex portion 6. It is preferable that the recessed portion 62 is arranged adjacent to the peak portion 61 at the highest position of the raised height H1 of the convex portion 6.

As shown in FIG. 2, the convex portion 6 is not limited to a protrusion perpendicular to the plane direction of the surface sheet 1. For example, as shown in FIGS. 3 (A) and 3 (B), there may be one that is tilted and raised, or one that bends in the middle of the uplift. Regardless of the raised shape of the convex portion 6, the raised height H1 of the convex portion 6 is, as described above, from the highest portion to the lowest portion of the surface of the convex portion 6 on the skin contact surface side. The distance in the thickness direction of. Further, in each convex portion 6, the height of the peak portion 61 may be uniform or non-uniform. Further, the heights of the peaks 61 may be uniform or non-uniform between the convex portions 6.

The peak portion 61 is formed according to the shape of the convex portion 6.
For example, when the individual convex portions 6 have a frustum shape independent of each other as shown in FIG. 4, the peak portion 61 is formed in an annular shape with the convex portion 6 viewed in a plan view. In this case, the recess 62 is arranged in a region surrounded by the annular peak 61 in a plan view. When the peak portion 61 is annular, the annular may be a complete ring without a break, or may have a portion where the ring is interrupted in the middle. When the convex portion 6 has a truncated cone shape, the convex portion 6 preferably has a truncated cone shape, and the peak portion 61 preferably has a circular shape in a plan view from the viewpoint of enhancing the soft touch of the surface sheet 1. ..
Further, when each convex portion 6 is formed in a streak shape in the plane direction as shown in FIG. 5, the ridge portion 61 is also formed in a streak shape in accordance with this. In this case, two streaky peaks 61 are arranged in parallel, and the recess 62 is arranged in the region sandwiched between the peaks 61 and 62. In the case of the streaky peak portion 61, the streak may have no break, and there may be a break in the middle of the streak.
In any of the aspects of FIGS. 4 and 5, in the cross section of the convex portion 6 in the thickness direction passing through the recessed portion 62, the two peak portions 61, 61 and the recessed portion 62 between them can be confirmed.

The peak portion 61 preferably has a rounded tip from the viewpoint of enhancing the soft touch of the surface sheet 1. Further, the peak portion 61 preferably has an inclined surface (tapered shape) that descends from the tip toward the recessed portion 62 in order to facilitate the transfer of the skin care agent 4 to the skin.

As shown in FIGS. 2, 3 (A) and 3 (B), the recessed portion 62 is adjacent to the peak portion 61 and opens toward the skin contact surface side. Further, the recessed portion 62 is a shallow recessed portion having a raised height H1 of the convex portion 6 so as not to impair the raised shape of the convex portion 6. The depth H2 of the recessed portion 62 is preferably 50% or less, more preferably 40% or less, based on the raised height H1 of the convex portion 6 from the viewpoint of maintaining a soft touch and cushioning property due to the uneven structure 5 of the surface sheet 1. preferable. Further, the depth H2 of the recessed portion 62 is preferably 10% or more, more preferably 20% or more, based on the raised height H1 of the convex portion 6 from the viewpoint of enhancing the sustainability of the following skin care effect. The depth H2 of the recessed portion 62 is a depth descending from that position with reference to the portion arranged at the highest position of the peak portion 61, applying the measurement method of the above-mentioned “raised height H1 of the convex portion 6” mutatis mutandis. Can be measured as. As shown in FIGS. 2, 3 (A) and 3 (B), the recessed portion 62 is not limited to one location for one convex portion 6, and may be arranged at a plurality of locations. ..

In each of the convex portions 6, the recessed portion 62 is provided with more skin care agent 4 than the peak portion 61. The amount of the skin care agent 4 referred to here refers to the amount of the skin care agent 4 present on the surface of the peak portion 61 and the recess portion 62 on the skin contact surface side. The magnitude relationship of the amount of the skin care agent 4 can be measured by the following method.

(Evaluation method of the amount of skin care agent)
Infrared spectroscopy (IR) can be used as a method for evaluating the magnitude relationship of the amount of the skin care agent 4. When comparing the place where the skin care agent 4 is abundant and the place where the skin care agent 4 is a little, it is possible to judge the place where the skin care agent is abundant and the place where the skin care agent is a little by comparing the height of the infrared absorption peak derived from the target skin care agent obtained by IR. Is. That is, it can be determined that the higher the infrared absorption peak (the larger the amount of absorption), the more the skin care agent 4 present.
The ATR method can be used for infrared spectroscopy, and if the measurement range is sufficiently wide, any of the absorption peaks obtained by direct measurement (macro: 2 to 3 mm) (for example, the above-mentioned diamide derivative) can be used. In the case of, the absorption peak of the amide group, 3300 cm ^-1 ), can be compared. Further, when the measurement site is small, it is preferable to use a microscope (100 μm).
As an example, the procedure of the above measurement is shown below.
Measuring device: PerkinElmer Spectrum One (+ Multiscope)
Macro measurement: ATR probe is measured by single reflection using diamond Microscopic measurement: ATR probe is measured by germanium Wavenumber resolution: 4 cm ^-1
Number of integrations: 4 times (macro measurement), 16 times (micro measurement)

Due to the above arrangement of the skin care agent, the skin care agent 4 stays in the recess 62 at the upper portion 6T of the convex portion 6 in contact with the skin, and even if a small amount of the skin care agent 4 is arranged, it can be efficiently transferred to the skin. Can be done. Further, in the convex portion 6 in contact with the skin, the recessed portion 12 serves as a storage portion for the skin care agent 4, and the skin care agent 4 is applied not only at the same height position as the peak portion 61 but also at a position lower than the peak portion 61. It can be fastened and held stably. Further, the recessed portion 62 can prevent the skin care agent 4 from physically falling off or flowing down due to excrement. On the other hand, the peak portion 61 adjacent to the recess portion 62 comes into contact with the skin surface and transfers the skin care agent 4 to the skin. In addition, the peak portion 61 can also receive the supply of the skin care agent 4 from the adjacent recessed portion 62, and it is easy to sustain the transfer of the skin care agent 4 to the skin. The supply of the skin care agent 4 from the recessed portion 62 to the peak portion 61 may occur, for example, triggered by contact or rubbing between the surface sheet 1 and the skin surface. Further, depending on the degree of contact or rubbing between the surface sheet 1 and the skin surface, the skin care agent 4 staying in the recessed portion 62 may directly touch the skin surface and migrate due to the strong pressing against the peak portion 61. These transitions are more likely to occur because the skin care agent 4 is heated by body temperature or the like to increase its fluidity.
As a result, the combination of the peak portion 61 and the concave portion 62 in the convex portion 6 gradually and continuously transfers the skin care agent 4 to the skin, and enhances the sustainability of the skin care effect. As a result, the diaper 10 can maintain a good wearing feeling for a long time.
Further, in the diaper 10, since the surface sheet 1 has the above-mentioned convex portion 6, the contact area between the surface sheet 1 and the wearer's skin surface can be suppressed and the air permeability can be improved. The breathability combined with the sustainability of the skin care effect described above further enhances the good wearing feeling of the diaper 10.

Based on the above measurement method, the ratio of the amount Q1 of the skin care agent 4 in the recess 62 to the amount Q2 of the skin care agent 4 in the peak 61 enhances the sustainable transferability of the skin care agent 4 to the skin. From the viewpoint, 1.1 / 1 or more is preferable, 1.2 / 1 or more is more preferable, and 1.5 / 1 or more is further preferable. Further, the ratio Q1 / Q2 is preferably 20/1 or less, more preferably 10/1 or less, still more preferably 5/1 or less, from the viewpoint of suppressing inhibition of absorption performance.

By arranging the amount of the skin care agent 4 according to the above ratio in the peak portion 61 and the recess portion 62, the amount of the skin care agent 4 in the entire surface sheet 1 can be suppressed without being excessive. As a result, the skin care agent is continuously transferred to the skin surface while suppressing the inhibition of absorption performance, which is preferable. From this viewpoint, the amount of the skin care agent 4 arranged on the surface sheet 1 is preferably 5 g / m ² or less, more preferably 3 g / m ² or less, and even more preferably 1 g / m ² or less. The amount of skin care agent 4 that is disposed on the surface sheet 1, from the viewpoint of sufficiently exhibiting the skin care benefits, 0.01 g / ^{m 2} or more preferably, 0.05 g / ^{m 2} or more preferably, 0.1 g / M ² or more is more preferable. The amount of the skin care agent can be obtained by selecting an appropriate solvent according to the type of the skin care agent, extracting from the surface sheet 1, and quantifying using gas chromatography (GC) or high performance liquid chromatography (HPLC). .. Further, the amount of the skin care agent per unit area can be obtained by dividing the quantified amount of the skin care agent by the area of the surface sheet 1 to be extracted. As the solvent to be used, one or a combination of two or more of highly polar solvents such as methanol and ethanol (highly polar solvents), non-polar solvents such as hexane, and solvents having a lower polarity than the highly polar solvents should be used. Can be done.

As shown in FIGS. 2 to 5, the convex portion 6 may be provided with a hollow portion 63, or may be a solid portion without the hollow portion 63 (not shown). However, it is preferable that the convex portion 6 includes the hollow portion 63. As a result, even if there is a change in the load on the surface sheet 1 due to the movement of the wearer, the convex portion 6 flexibly follows the skin surface, and the above-mentioned skin care agent 4 is more smoothly transferred to the skin. Can be expressed. In addition, the soft touch and cushioning property of the convex portion 6 can be improved.

The surface sheet 1 is shown in FIGS. 2 to 5 as being composed of one non-woven fabric, but the present invention is not limited to this, and a plurality of non-woven fabrics may be laminated in the thickness direction. Specific examples thereof include those shown in FIG. In the surface sheet 1 shown in FIG. 6, the first non-woven fabric 11 on the skin contact surface side has an uneven structure 5 and is joined to the flat second non-woven fabric 12 on the non-skin contact surface side. The second nonwoven fabric 12 is preferably joined to the bottom surface 71 of the recess 7 of the first nonwoven fabric 11. The bonding between the first non-woven fabric 11 and the second non-woven fabric 12 may be performed by an adhesive or by heat fusion of an embossing treatment. The hollow portion 63 is surrounded by the first non-woven fabric 11 and the second non-woven fabric 12, and the joint portion between the first non-woven fabric 11 and the second non-woven fabric 12 is arranged around the hollow portion 63 to form the hollow portion 63 and the hollow portion 63. The shape stability of the included convex portion 6 is increased. As a result, the continuous transfer of the skin care agent 4 to the skin by the peak portion 61 and the depression portion 62 described above can be realized more stably. In addition, the convex portion 6 satisfactorily exhibits a soft touch and cushioning property.

The convex portion 6 of the surface sheet 1 can be manufactured by various methods usually used for absorbent articles. For example, when the non-woven fabric constituting the surface sheet 1 is formed by the air-through method, the fiber web before fusion is placed on the uneven support and the hot air treatment is performed to form the uneven shape to form the convex portion 6. can do. The non-woven fabric or the fiber web may be formed into irregularities using a tooth groove roll or the like. When the tooth groove roll is used, one non-woven fabric may be formed into irregularities, and at the same time, heat-sealed with another flat non-woven fabric in the concave portion to form the convex portion 6 as shown in FIG. Further, the non-woven fabric or the fiber web may be formed into irregularities by intermittent embossing. In this case, even if the fiber web contains heat-shrinkable fibers in a predetermined region and is subjected to intermittent embossing treatment, then the non-embossed portion is raised by hot air treatment to form a convex portion and the embossed portion is formed as a concave portion. Good.
The recessed portion 62 in the convex portion 6 can be formed after the formation of the convex portion 6. In forming the recess 62, various methods commonly used in absorbent articles can be employed. For example, a method of forming a dent by crushing it by heat compression, a method of giving a dent to the top by applying mechanical force after shaping, and a vent in advance at the top of the convex part of the uneven support. An example is a method in which a recess having the above is provided and suction is performed from inside the convex portion.

The application of the skin care agent 4 to the convex portion 6 can be performed by various methods usually used for absorbent articles. In particular, it is preferable to apply the coating while applying a predetermined pressure using a contact type coater. As a result, the skin care agent 4 can be more reliably distributed to the recessed portion 62 than to the peak portion 61.

In the present embodiment, it is preferable that the root wall portion 64 of the convex portion 6 has a higher fiber density than the wall portion (hereinafter, referred to as the upper wall portion) 65 above the root wall portion 64. The fiber density in each wall portion is the number of fibers per unit area on the surface of the surface sheet 1. When the root wall portion 64 of the convex portion 6 has a high fiber density as described above, the number of fibers is larger (the distance between fibers is smaller) than that of the upper wall portion 65 of the root wall portion 64 of the convex portion 6. It is a dense area. Since the fiber density of the root wall portion 64 is high, the shape of the convex portion 6 can be maintained. Further, as compared with the root wall portion 64, the upper wall portion 65 and the recessed portion 62 are more easily deformed, and it is possible to realize a soft touch in a region most likely to come into contact with the wearer's skin in the wearing state. The "root wall portion 64" referred to here is a surface portion of the convex portion 6 in the above-mentioned root portion 6N. Further, the "upper wall portion 65" refers to the surface portion of the convex portion 6 in the upper portion 6T described above.

(Method of measuring the fiber density of the root wall portion 64 of the convex portion 6 and the fiber density of the upper wall portion 65)
In the present invention, the "fiber density" of the root wall portion 64 and the upper wall portion 65 is a convex portion in a state where the shape of the surface sheet 1 is not changed (for example, in a non-contact manner without applying a load to the surface sheet 1). The root wall portion 6 and the upper wall portion 65 of No. 6 are observed with an optical microscope, respectively, and per unit area of the surface of the root wall portion 64 and the upper wall portion 65 portion in a predetermined sheet (first non-woven fabric 11 in FIG. 6). It is calculated by measuring the number of fibers of.

Based on the above measurement method, the ratio S1 / S2 of the fiber density S1 of the root wall portion 64 to the fiber density S2 of the upper wall portion 65 of the root wall portion 64 is the soft touch of the convex portion 6 and the entire convex portion 6. From the viewpoint of achieving both resistance to crushing, 1.1 / 1 or more is preferable, 1.25 / 1 or more is more preferable, and 1.5 / 1 or more is further preferable. Further, the ratio S1 / S2 is preferably 5/1 or less, more preferably 4/1 or less, and 3/1 or less, from the viewpoints of absorption performance, the soft touch of the convex portion 6 and the difficulty of crushing the entire convex portion 6. Is more preferable.

The above-mentioned difference in fiber density can be formed by, for example, the method described in each example of JP2012-136790. The web supplied from the card machine to the web shaping device is fixed on a pedestal that has a large number of protrusions and is breathable, and then hot air is blown onto the fiber web on the pedestal to make the protrusions on the pedestal. A method of shaping the fiber web and fusing the fibers of each core-sheath structure can be mentioned. According to this method, the fiber density is low in the web region driven away from the pedestal by the hot air, and the fiber density is relatively high in the web region close to the pedestal due to the short distance the fibers are driven away. ..

Further, in the present embodiment, as shown in FIG. 7, the surface sheet 1 may include a high convex portion 66 and a low convex portion 67 having a height lower than that of the high convex portion 66. In this case, the high convex portion 66 is preferably a convex portion 6 having a recessed portion 62 containing the skin care agent 4. That is, the highly convex portion 66 has two peaks 61 and a recess 62 sandwiched between the two peaks 61 in a cross-sectional view in the thickness direction, and the recess 62 is larger than the peak 61. It is preferable that a large amount of skin care agent is distributed. As a result, the continuous transfer of the skin care agent 4 to the wearer's skin can be realized more stably. In this case, as long as the recessed portion 62 containing the skin care agent 4 is arranged in the high convex portion 66, the recessed portion 62 containing the skin care agent 4 may also be arranged in the low convex portion 67.

In the present embodiment, the convex portion 6 having the recessed portion 62 containing the skin care agent 4 is directed to the skin contact surface side of the surface sheet 1 as long as the above-mentioned skin care agent 4 is continuously transferred to the skin. It can be arranged in various patterns.

For example, as shown in FIG. 1, a region extending from the center L of the width direction X of the diaper 10 to the longitudinal direction Y of the surface sheet 1 at a predetermined width (the surface sheet 1 is not covered by the pair of side sheets 8 and 8 and is exposed. A convex portion 6 having a recessed portion 62 containing the skin care agent 4 may be arranged over the entire M1. This is preferable because the range in which the skin care agent can be continuously transferred becomes wide. As a specific example thereof, the convex portion 6 is formed into an independent frustum shape as shown in FIG. 4, and the concave portion 62 containing the skin care agent 4 is arranged in all the convex portions 6 as shown in FIG.

On the other hand, the convex portions 6 having the recessed portions 62 containing the skin care agent 4 may be scattered in the plane direction of the surface sheet 1 with respect to the above region M1. In the case of the scattered arrangement, the skin care agent on the convex portion without the dented portion is preferentially transferred at the initial stage, and the skin care agent is continuously transferred to the skin in the convex portion having the dented portion 62, so that the diaper is initially worn. The skin care effect can be effectively maintained from time to time. Further, it is preferable to leave the convex portion without the recessed portion because it is possible to secure the cushioning property, the air permeability and the liquid passing performance of the surface material. The scattered arrangement may be either a regular scattered arrangement or an irregular scattered arrangement.
As a specific example of the regular scattered arrangement, as shown in FIG. 9A, there is an arrangement pattern in which the convex portions 6 having the recessed portions 62 containing the skin care agent 4 are arranged in an oblique grid pattern. Here, a convex portion 69 having no recessed portion 62 is arranged between the convex portions 6 and 6 having the recessed portion 62 containing the skin care agent 4. In the case of the diagonal grid-like arrangement, the convex portion 69 having no recessed portion 62 and the convex portion 6 having the recessed portion 62 can be uniformly arranged in a grid pattern, and the above-mentioned uniform skin care effect and the cushion of the surface material can be uniformly arranged. It is preferable because it is possible to secure all of retention, air permeability and liquid passage performance. The convex portion 69 without the recessed portion 62 may contain a skin care agent or may not contain the skin care agent.
Further, as shown in FIG. 9B, there is an arrangement pattern in which rows of convex portions 6 having recesses 62 containing the skin care agent 4 are arranged in the longitudinal direction Y and arranged intermittently in the width direction X (striped arrangement). Can be mentioned. In this case, as shown in FIG. 10, in the above-mentioned region M1, a row of convex portions 6 having recesses 62 containing the skin care agent 4 is arranged in the plurality of striped regions M2, and is adjacent to the region M2. A row of convex portions 69 having no recessed portion 62 is arranged in the region M3. In this arrangement pattern, the convex portion 69 having no recessed portion 62 and the convex portion 6 having the recessed portion 62 can be arranged in a striped shape, and the above-mentioned skin care effect, cushion holding property of the surface material, and vertical breathability can be arranged. It is preferable because it is possible to secure both the liquid passing performance and the liquid passing performance. The convex portion 69 without the recessed portion 62 may contain a skin care agent or may not contain the skin care agent. As an example of this modification, as shown in FIG. 9C, in the region M3, a convex portion 68 having a recessed portion 62 that does not contain the skin care agent 4 may be arranged. In this case, the skin care agent can be applied in a striped shape, the amount of the skin care agent can be reduced, and the liquid passage performance can be ensured, which is preferable.
In FIGS. 9B and 9C, rows of convex portions 6 having recesses 62 containing the skin care agent 4 arranged in the longitudinal direction Y are arranged one by one in the region M2. Not limited to. For example, the region M2 may be formed by bundling a plurality of rows of two or more rows. In this case, lateral air permeability and liquid flow performance can be ensured, which is preferable. Further, the striped arrangement is not limited to the case where the convex portions 6 having a frustum shape independent of each other as shown in FIG. 4 are used, and the convex portions 6 formed in a streak shape as shown in FIG. 5 are formed in the longitudinal direction Y. It may be extended to and intermittently arranged in the width direction X. In this case, it can be arranged in a stripe shape in the vertical direction, and even if the diaper is twisted in the vertical direction, it is possible to continuously secure the skin care transition effect, vertical breathability, and liquid passage performance, and it is possible to secure the vertical direction. It is preferable because the effect of preventing the spread of stool to the stool can be enhanced.

Further, in the surface sheet 1, the shape, number, and size of the convex portions 6 are not limited to those shown in FIGS. 2 to 9. The convex portion 6 is provided with a ridge portion 61 and a recessed portion 62 sandwiched between the ridge portions 61, and the skin care agent 4 is arranged in a specific arrangement to more stably express the above-mentioned continuous transfer of the skin care agent 4 to the skin. As long as, the shape, number, and size of the convex portions 6 can be appropriately set.

As the constituent members of the diaper 10 of the present embodiment, materials usually used in absorbent articles can be used without particular limitation. In addition to the above-mentioned constituent members, other members may be incorporated as appropriate. Further, the configuration of the diaper 10 is not limited to the one shown in FIG. 1, and a unit of a vertically long absorbent body (front sheet, back sheet and absorber) is combined with an exterior body separated into a front side portion and a rear side portion. It may be a diaper.

The absorbent article of the present invention is not limited to the above embodiments. As described above, as long as the surface sheet 1 in which the peak portion 61 and the recessed portion 62 are arranged in the convex portion 6 and the skin care agent 4 is arranged in the recessed portion 62 more than the peak portion 61 is provided, it can be applied to various absorbent articles. can do. For example, it is not limited to tape-type diapers, but may be pants-type diapers, such as urine absorbing pads, sanitary napkins, and panty liners, which are worn in contact with the wearer's skin to absorb excrement. Applicable to goods.

1 Front surface sheet 2 Back surface sheet 3 Absorbent 4 Skin care agent 5 Concavo-convex structure 6 Convex part 61 Peak part 62 Recessed part 63 Hollow part 64 Root wall part 65 Wall part above the root wall part (upper wall part)
66 High convex part 67 Low convex part 7 Concave 8 Side sheet 9 Fastening tape 10 Diaper 10A Front side flap 10B Rear side flap

Claims (4)

An absorbent article comprising a front surface sheet on the skin contact surface side, a back surface sheet on the non-skin contact surface side, and an absorber interposed between the front surface sheet and the back surface sheet.
The surface sheet has a convex portion containing a skin care agent on the skin contact surface side.
The convex portion has two peaks and a recess sandwiched between the two peaks in a cross-sectional view in the thickness direction, and more skin care agent is arranged in the recess than the peak. Absorbent article. The absorbent article according to claim 1, wherein the root wall portion of the convex portion has a higher fiber density than the wall portion above the root wall portion. The first or second claim, wherein the surface sheet includes a high-convex portion and a low-convex portion having a height lower than that of the high-convex portion, and the high-convex portion is a convex portion containing the skin care agent. Absorbent article. The absorbent article according to any one of claims 1 to 3, wherein the convex portions containing the skin care agent are scattered in the plane direction of the surface sheet.

Images