JP6604264B2 - Absorbent article and manufacturing method thereof - Google Patents

Description

  The present invention relates to an absorbent article and a method for producing the same.

  2. Description of the Related Art Absorbent articles such as disposable diapers (hereinafter also simply referred to as “diapers”) in which discharged body fluid (hereinafter simply referred to as “liquid”) is guided to an absorber and absorbed are widely known. A liquid-permeable surface sheet is disposed on the skin contact surface side of the absorbent article, and the liquid is transmitted toward the inside of the absorbent article by the capillary force of the fibers constituting the surface sheet. .

  While the liquid that has penetrated into the absorbent article is absorbed by the absorbent body, there is a case where the liquid returns from the inside of the absorbent article to the skin contact surface side (hereinafter also referred to as “wet back”).

  Therefore, for example, in Patent Document 1, two types of top sheets having different properties are laminated above the absorbent body, and the hydrophilicity of the fibers constituting the top sheet on the skin contact surface side is set to the skin non-contact surface side. It is disclosed that it is configured to be lower than the hydrophilicity of the fibers constituting the top sheet. With this configuration, the amount of wet back is reduced by suppressing the return of the liquid to the skin contact surface side.

JP 2004-166832 A

  However, the absorbent article described in Patent Document 1 does not focus on the absorption speed of the top sheet with respect to the liquid, and if the absorption speed is slow, the liquid will stay in the vicinity of the top sheet, causing stickiness. There was a risk of this. Therefore, there is still room for improvement in the structure of the surface sheet.

  An object of the present invention is to provide an absorbent article for increasing the absorption speed of discharged body fluid and reducing the amount of wetback, and a method for manufacturing the same.

  An absorbent article according to the present invention is an absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between the top sheet and the back sheet, The hydrophilic difference portion formed on the surface sheet and the hydrophilic difference portion are so formed that the hydrophilicity on the skin contact surface side of the surface sheet is lower than the hydrophilicity on the skin non-contact surface side of the surface sheet. And a high-density portion in which the density of the surface sheet is higher than the periphery.

  Moreover, the manufacturing method by this invention manufactures an absorbent article provided with a liquid-permeable surface sheet, a liquid-impermeable back sheet, and an absorber disposed between the surface sheet and the back sheet. A step of forming a hydrophilic difference portion in the surface sheet so that the hydrophilicity of the surface sheet on the skin contact surface side is lower than the hydrophilicity of the surface sheet on the skin non-contact surface side; A step of forming a high density portion in the hydrophilic difference portion, and a step of bonding the surface sheet in which the hydrophilic difference portion and the high density portion are formed to the absorbent body so that the density of the surface sheet is higher than the periphery. It is characterized by including.

  According to the present invention, it is possible to increase the absorption speed of the discharged body fluid and reduce the wetback amount.

In the external appearance of an example of the diaper which concerns on 1st Embodiment of this invention, it is the perspective view seen from the front side. It is the top view which looked at the diaper of an extension state concerning a 1st embodiment of the present invention from the surface sheet side. It is a disassembled perspective view of the diaper shown in FIG. FIG. 4 is a sectional view in the IV-IV direction in FIG. 2. It is the top view which looked at the absorber based on 1st Embodiment of this invention from the surface sheet side. It is the top view which looked at the absorber based on 2nd Embodiment of this invention from the surface sheet side. It is a VII-VII direction sectional view in Drawing 6. It is a figure showing the example of the formation pattern of a high-density part and a recessed part, (a) is the pattern provided in the vertical stripe form, (b) is the pattern provided in the horizontal stripe form, (c) is the pattern provided in the diagonal lattice form (D) represents a pattern in which two sawtooth shapes are combined, and (e) represents a pattern in which a plurality of vertically long ellipses are arranged. It is a figure showing the example of formation of a hydrophilic difference part.

  An embodiment of an absorbent article according to the present invention will be described in detail with reference to FIGS. 1 to 9. However, the present invention is not limited to the aspect of the present embodiment.

  The absorbent article which concerns on this embodiment makes the hydrophilic property of the skin contact surface side lower than the hydrophilic property of the skin non-contact surface side about the surface sheet located in the skin contact surface of an absorber, and the hydrophilicity is It is comprised so that a high-density site | part may be provided in a different part. This configuration makes it easier for liquid to be absorbed at high-density sites, and the liquid guided to the absorber side is less likely to return to the skin contact surface side of the topsheet, thereby suppressing stickiness and improving the feeling of use. It becomes possible to improve.

  First, a first embodiment in which the present invention is applied to a deployable disposable diaper will be described below.

<First Embodiment>
<Configuration>
FIG. 1 shows a perspective view of an example of a diaper according to the first embodiment of the present invention as viewed from the front side. The diaper 10 according to the present embodiment is a deployable disposable diaper, and includes a front body region 10F, a back body region 10R, and a crotch region 10C that connects the front body region 10F and the back body region 10R. Moreover, the waist periphery opening part 10W which surrounds a wearer's waist part with the front body area | region 10F and the back body area | region 10R at the time of wear is formed. Similarly, a pair of left and right leg openings 10L that surround the thighs of the wearer's legs are formed by the lower ends of the front body region 10F and the back body region 10R and the crotch region 10C.

  When worn, the front body region 10F is positioned on the wearer's ventral side, and the back body region 10R is positioned on the wearer's back side. The crotch region 10C covers the wearer's crotch when worn, and the wearer's legs are respectively passed through the pair of left and right leg openings 10L. Therefore, the leg-hole opening 10L is located anywhere from the base of the wearer's legs to around the thigh.

  The left and right edge portions of a rear body region 10R of a cover sheet 11 (described later) located outside the diaper 10 are overlapped with the left and right edge portions of the front body region 10F when worn, and are connected to each other, thereby opening a leg opening 10L. A pair of left and right fastening tapes 10 </ b> A capable of forming the above are adhered. The fastening tape 10A is bonded to the front patch sheet 10B adhered on the cover sheet 11 in the front body region 10F so as to be repeatedly peelable.

  FIG. 2 is a plan view of the stretched diaper 10 as viewed from the top sheet 14 side according to the first embodiment of the present invention. 3 is a schematic exploded perspective view of the diaper 10 shown in FIG. 1, and the diaper 10 of FIG. 2 and the absorber 13 of FIG. 3 are shown in a partially broken state for convenience of explanation. .

  As shown in FIG. 2, the diaper 10 according to this embodiment includes, in order from the outside, a cover sheet 11 formed of a thin nonwoven fabric to obtain a good touch, a back sheet 12 having liquid impermeability, and absorption. It has a laminated structure in which a body 13, a top sheet 14 having liquid permeability, and a pair of side sheets 15 are stacked.

  A pair of notches 11N that are respectively leg openings 10L are formed on the left and right sides of the crotch region 10C of the cover sheet 11. Between the cover sheet 11 and the pair of side sheets 15, a pair of rubber threads 16 for forming a leg gather is bonded in an extended state.

  The top sheet 14 is composed of a woven fabric, a nonwoven fabric, a porous film or the like having liquid permeability. Among these, the nonwoven fabric is preferably made of fibers of thermoplastic resin such as polypropylene, polyethylene, polyester, nylon and the like. In this embodiment, the surface sheet 14 is comprised from two types of nonwoven fabrics from which hydrophilicity differs. As shown in FIG. 3, the topsheet 14 includes a first layer 14A located on the skin contact surface side and a second layer 14B located on the skin non-contact surface side from the first layer 14A. The surface sheet 14 is formed with a hydrophilic difference portion 20 such that the hydrophilicity of the surface sheet 14 on the skin contact surface side is lower than the hydrophilicity of the surface sheet 14 on the skin non-contact surface side. . That is, in the present embodiment, the hydrophilicity of the first layer 14A is lower than the hydrophilicity of the second layer 14B. Moreover, in this embodiment, the hydrophilicity difference part 20 is provided in the whole surface of the surface sheet 14, as shown in FIG. 5 mentioned later. Furthermore, the surface sheet 14 of the present embodiment is provided with a high-density portion 21 that is provided in the hydrophilicity difference portion 20 and in which the density of the surface sheet 14 is higher than the periphery. Compared with the part in which the high density part 21 is not formed in the hydrophilic difference part 20 in the part in which the high density part 21 is formed in the hydrophilicity difference part 20, between the fibers constituting the surface sheet 14 The distance is shorter and the capillary force is stronger. The high density portion 21 is represented by a plurality of hatched hatching in FIGS. 2 to 5 and FIG. 9 described later. Details of the hydrophilicity difference portion 20 and the high density portion 21 will be described later.

  The back sheet 12 is bonded to the cover sheet 11, and the absorber 13 is disposed between the back sheet 12 and the top sheet 14, and the top sheet 14 is bonded to the back sheet 12 through the absorber 13. . Further, in the back sheet 12, an area corresponding to the upper end portion of the back body area 10R extends along the width direction of the back sheet 12, and is elastic for giving a wearer an appropriate wearing feeling around the waist. Sheet 10D is joined.

  The absorbent body 13 of the present embodiment located under the top sheet 14 is an absorbent main body mainly composed of water absorbent fibers such as pulp and rayon and a super absorbent polymer (hereinafter also referred to as “Super Absorbent Polymer”). The (absorbent core) 17 is covered with a covering member (core wrap) 18 such as tissue or nonwoven fabric. The seam formed by wrapping the absorbent main body 17 with the covering member 18 is, for example, formed on the upper surface of the absorbent body 13 and extending in the longitudinal direction, as shown in FIG. The absorbent body 13 of this embodiment has an elongated shape so as to extend from the front body, the crotch, and the back body. Here, assuming that the front body part to the back body part are the front and rear (up and down) directions, and the direction orthogonal to the front and back parts is the left and right direction, the absorbent body 13 of the present embodiment is a rectangular thing with different front and rear (up and down) left and right lengths. (In FIG. 2 and FIG. 3, the front and rear (up and down) lengths are longer than the left and right lengths). In addition, the shape of the absorber 13 of this embodiment is not restricted to this, For example, the thing of the substantially square whose front and back (upper and lower) left and right lengths are comparable, and the corner | angular of the front and rear (up and down) end are rounded off Various shapes such as an elliptical shape extending in the front-rear direction (up and down) and a circular shape are included. Moreover, a pair of notch parts which make | form arc shape may be formed in the crotch part of the absorber 13 so as to correspond to a pair of leg periphery opening part 10L. In addition, in the diaper 10 which concerns on this embodiment, although the absorber 13 wrapped with the coating | coated member 18 is used, the absorbent article which concerns on this invention uses the absorptive main body 17 which is not wrapped with the coating | coated member 18. FIG. May be.

  A pair of hydrophobic side sheets 15 forming a three-dimensional gather are provided on the left and right side edges in the width direction of the top sheet 14 in the present embodiment. The pair of side sheets 15 has outer end edges formed in the same shape as the pair of notches 11N of the cover sheet 11, and stands along the left and right edges of the absorbent body 13 when worn. This is a member for preventing lateral leakage of the discharged body fluid. In each of the pair of side sheets 15, a rubber thread 19 as a three-dimensional gather stretchable material is arranged in an expanded state in a form in which the inner edge portion is folded and gripped toward the absorber 13. The pair of side sheets 15 rises toward the wearer's skin contact direction when the rubber thread 19 contracts. The three-dimensional gather can employ a known configuration used in conventional disposable diapers. For example, it can be formed by sandwiching and fixing a stretched three-dimensional gather elastic material between the layers of the water repellent sheet.

<Hydrophilic difference part>
FIG. 4 is a cross-sectional view in the IV-IV direction in FIG. For simplification of description, the joint of the covering member 18 is omitted in FIG. 4 (the same applies to FIG. 7 described later). FIG. 5 is a plan view of the absorber 13 as viewed from the top sheet 14 side according to the present embodiment.

  The hydrophilic difference portion 20 of the topsheet 14 is formed by a hydrophilic treatment with a hydrophilizing agent. Examples of hydrophilizing agents include surfactants, more specifically nonionic surfactants such as polyoxyethylene alkyl ethers and fatty acid sorbitan esters, monoalkyl sulfates, alkyl polyoxyethylene sulfates, alkylbenzene sulfonic acids. Anionic surfactants such as salts and monoalkyl phosphates, cationic surfactants such as alkyltrimethylammonium salts, dialkyldimethylammonium salts and alkylbenzyldimethylammonium salts, amphoteric interfaces such as alkyldimethylamine oxide and alkylcarboxybetaines Examples include activators. Thereby, the hydrophilicity of 14 A of 1st layers is formed so that the hydrophilicity of 2nd layer 14B may become lower among the two surface sheets 14. FIG.

  In the present embodiment, the topsheet 14 is divided into two layers. However, in the present invention, if the hydrophilicity on the skin contact surface side is lower than the hydrophilicity on the skin noncontact surface side, 3 It can be more than a layer. In this embodiment, the level of hydrophilicity is clearly separated by the two sheets. However, the present invention is not limited to this, and the hydrophilicity on the skin contact surface side of the top sheet is not skin contact. One surface sheet may be used as long as it is lower than the hydrophilicity on the surface side. In this case, the hydrophilicity in the hydrophilicity difference portion 20 is different continuously or stepwise in the thickness direction of one surface sheet. That is, a gradient is provided in the thickness direction of the topsheet for the hydrophilicity of the hydrophilicity difference portion 20. In addition, in the present invention, the hydrophilicity on the skin contact surface side after absorption of bodily fluid is of course not limited to the aspect in which the hydrophilicity on the skin contact surface side is lower than the hydrophilicity on the skin non-contact surface side before and after absorption of body fluid. It is good also as an aspect which the state which becomes lower than the hydrophilicity of the skin non-contact surface side expresses.

<High density part>
In the present embodiment, the high density portion 21 is formed in the hydrophilic difference portion 20 of the topsheet 14. The discharged body fluid is absorbed at a high speed by a strong capillary force in the portion where the high density portion 21 is formed.

  The high-density portion 21 is selected from, for example, embossing under high pressure and / or high temperature compared to other regions, fiber-to-fiber bonding processing, heat sealing processing, or a combination thereof. Formed by means.

The density of the high density portion 21 is preferably ½ or more, and preferably 0.03 g / cm ³ or more, of the area of the hydrophilic difference portion 20 where the high density portion 21 is not formed.

  In the present embodiment, as shown in FIG. 4, the high-density portion 21 is formed across the two topsheets 14 in the thickness direction of the topsheet 14. In the present embodiment, the portion where the high-density portion 21 is formed is thinner than the two top sheets 14 as shown in FIG. 4 (the same applies to FIG. 7 described later). Further, as shown in FIG. 5, five high-density portions 21 are formed so as to be parallel to each other in the longitudinal direction (front-rear direction) of the absorber 13. In the present invention, the present invention is not limited to this, and the high-density portion 21 may be formed with emphasis on an arbitrary place where the liquid is to be absorbed quickly, for example, in the crotch region and its periphery.

  The body fluid discharged from the wearer toward the surface of the top sheet 14 is absorbed at high speed in the portion of the top sheet 14 where the high density portion 21 is formed. Then, the liquid drawn into the surface sheet 14 by the strong capillary force of the high density portion 21 is guided into the diaper 10. The induced liquid is absorbed by the absorber 13, while wetback may occur. This wetback has caused skin problems such as stuffiness and rash. However, since the hydrophilicity of the first layer 14A is lower than the hydrophilicity of the second layer 14B of the two surface sheets 14, the liquid is suppressed from rising toward the skin contact surface side. Will be. Therefore, according to the present embodiment, it is possible to increase the absorption speed of the discharged body fluid and reduce the wetback amount. Therefore, stickiness can be suppressed and the usability can be improved.

  In the present embodiment, the density of the high density portion 21 is uniform, but in the present invention, the density of the high density portion 21 is lower on the skin contact surface side than on the skin non-contact surface side. It may be formed as follows. With this configuration, the capillary force on the skin contact surface side is weaker than the capillary force on the skin non-contact surface side, so that the rise of liquid to the skin contact surface side is suppressed, and the amount of wetback is reduced. Further reduction is possible.

  Moreover, it is preferable that the high density part 21 is formed in the area ratio of 10 to 50% in the range which the surface sheet 14 covers the absorber 13, in order to show | play the effect of this invention effectively. When the area ratio is 10% or more, the discharged body fluid can be guided from the top sheet 14 to the absorber 13 at a higher speed. On the other hand, if the said area ratio is 50% or less, the effect which the high-density part 21 has can be expressed more suitably, maintaining the cushioning property at the time of wear.

  Furthermore, in this embodiment, although the high-density part 21 is not formed to the part corresponding to the upper-lower-end part and right-and-left end part of the absorber 13 among the surface sheets 14, in this invention, the recessed part 22 is the said part. May be formed.

  The diaper 10 which concerns on this embodiment is manufactured with the following manufacturing methods, for example.

  The hydrophilic difference portion 20 is formed in the topsheet 14 so that the hydrophilicity on the skin contact surface side of the topsheet 14 is lower than the hydrophilicity on the skin noncontact surface side of the topsheet 14.

  The high density portion 21 is formed in the hydrophilic difference portion 20 so that the density of the surface sheet 14 is higher than the periphery.

  An absorbent main body 17 composed of pulp and SAP is wrapped with a covering member 18 to produce a mat-like absorbent body 13. The produced absorber 13 is cut by a cutting device as necessary.

  The topsheet 14 on which the hydrophilicity difference portion 20 and the high density portion 21 are formed is joined to the absorber 13. Then, it joins with the back surface sheet 12, the cover sheet | seat 11, etc., it cuts as needed, and the diaper 10 is manufactured.

<Comparison evaluation>
The topsheet 14 according to the present embodiment was subjected to a comparative evaluation of hydrophilicity and wetback amount. For these comparative evaluations, various general evaluation methods can be employed. About the sample piece of the surface sheet 14 used for the said comparative evaluation, it prepared by following (1) and (2).
(1) The kind of the surface sheet 14 from which the sample piece was collected was a nonwoven fabric made from a composite fiber made of polyethylene and polyethylene terephthalate, and the basis weight of the nonwoven fabric was 25 g / m ² .
(2) The size of the sample piece was 5 cm × 15 cm.
(3) When the diaper (absorbent article) 10 was used, a sample piece having the size (2) was collected from a position corresponding to the crotch.

<Hydrophilicity evaluation method>
The hydrophilicity of the first layer 14A and the second layer 14B before forming the high-density portion 21 was comparatively evaluated.

  The physiological saline was dropped by a pipette one by one at 30 points on the first layer 14A. The number of droplets that permeated within 30 seconds (number of droplets) was determined. The same evaluation was performed on the second layer 14B, and the number of droplets was determined. The larger number of droplets was evaluated as having higher hydrophilicity (see Table 1 below).

  As shown in Table 1, since the number of droplets of the first layer 14A is smaller than the number of droplets of the second layer 14B, it can be understood that the former hydrophilicity is lower than the latter hydrophilicity.

<Method for evaluating wetback amount>
About the surface sheet 14 of the present embodiment and the conventional surface sheet in which the hydrophilicity difference portion 20 and the high density portion 21 are not formed (hereinafter, also referred to as “surface sheet according to a comparative example”) A comparative evaluation was performed.

In the central part on the top sheet 14 according to the present embodiment, 150 g of physiological saline was absorbed and left for 30 minutes. Next, 20 sheets of predetermined filter paper were placed on the absorption site of the physiological saline, and a load of 0.5 N / cm ² was further applied for 5 minutes to absorb the physiological saline on the filter paper. Thereafter, the load was removed, and the weight of the filter paper that absorbed physiological saline was measured. The weight of the filter paper before absorption was subtracted from this weight, and the value was taken as the wetback amount. The same evaluation was performed on the surface sheet according to the comparative example, and the wetback amount was obtained (see the following Table 2).

  As shown in Table 2, it can be understood that the wet back amount of the top sheet 14 according to the present embodiment is smaller than the wet back amount of the top sheet according to the comparative example.

Second Embodiment
In 2nd Embodiment of this invention, the recessed part 22 is further formed in the absorber 13 in addition to 1st Embodiment. FIG. 6 is a plan view of the absorber 13 as viewed from the top sheet 14 side according to the present embodiment, and FIG. 7 is a cross-sectional view in the VII-VII direction in FIG. For simplification of description, the side sheet 15 is not shown in FIG. Among the elements constituting the diaper 10 according to the present embodiment, those having the same function are denoted by the same reference numerals as those in the first embodiment, and the description thereof is omitted.

  In the present embodiment, the recess 22 is formed so as to overlap the high-density portion 21 as shown in FIG. That is, the high-density portion 21 is disposed in the portion where the recess 22 is formed. Specifically, the recess 22 is formed continuously as shown in FIG. 6, and the high-density portion 21 is arranged at a position corresponding to the bottom of the recess 22 as shown in FIG. 7. The recess 22 is formed, for example, by embossing with an embossing roll.

  According to the present embodiment, the discharged body fluid is diffused widely by the concave portion 22 and then absorbed at high speed in the high density portion 21 formed at a position corresponding to the bottom portion of the concave portion 22. Therefore, since the liquid is efficiently guided to the absorber 13 and absorbed, the liquid staying inside the diaper 10 is reduced. As a result, the wetback amount can be reduced as compared with the first embodiment.

  The portion where the high-density portion 21 is formed has a possibility that the cushioning property at the time of wearing may be reduced because the density is high. However, by providing the concave portion 22, the concave portion 22 is easily bent, and the fit of the diaper 10 is further improved. Moreover, since the passage of air is formed when the recessed part 22 is provided, it becomes possible to improve the air permeability of the diaper 10. FIG.

  In the present embodiment, the high density portion 21 is disposed at a position corresponding to the bottom portion of the concave portion 22, but the present invention is not limited to this, and the high density portion 21 is disposed on the bottom portion and / or the side portion of the concave portion 22. It may be arranged at a corresponding position. Further, the high density portion 21 may not be formed at a position corresponding to the concave portion 22.

  In addition, the recessed part 22 may be formed by integrally bonding the absorbent body 13 and the topsheet 14, or may be formed by embossing only the absorbent body 13. When the topsheet 14 is joined after forming the recess 22 in the absorbent body 13, the high-density section 21 may be formed in a portion of the topsheet 14 positioned above the recess 22. With this configuration, the liquid is guided to the concave portion 22 through the high-density portion 21 and diffused in the concave portion 22, and the same effect as in the present embodiment can be obtained. Further, the high density portion 21 may be formed at the same time when the concave portion 22 is formed. For example, when the absorber 13 and the surface sheet 14 are squeezed together to form the recess 22, the high density portion 21 may be formed on the surface sheet 14 by the squeezing.

  Moreover, in this embodiment, although the recessed part 22 is not formed to the upper-lower-end part and right-and-left end part of the absorber 13, it is not restricted to this, In this invention, it forms to the said upper-lower-end part and the said right-and-left end part. May be.

<Third Embodiment>
In 3rd Embodiment of this invention, in addition to 1st Embodiment, the further suppression of generation | occurrence | production of a wet back is enabled by further providing the part in which the basic weight in the surface sheet 14 differs. Among the elements constituting the diaper 10 according to the present embodiment, those having the same function are denoted by the same reference numerals as those in the first embodiment, and the description thereof is omitted.

  In the present embodiment, in the two-layer topsheet 14, the first layer 14A has a basis weight that is lower than the basis weight of the second layer 14B. It becomes weaker than the capillary force of the two layers 14B.

The basis weight of the first layer 14A is preferably ^{3~20g / m 2, 3~10g / m} 2 is more preferable. Moreover, 10-30 g / m < ² > is preferable and the basic weight of 2nd layer 14B has more preferable 15-25 g / m < ² >.

  While the liquid induced | guided | derived inside the diaper 10 is absorbed by the absorber 13, it may be going to raise toward the skin contact surface side. In the present embodiment, not only the hydrophilicity is low, but also the liquid is prevented from returning by the first layer 14A having a low basis weight and a weak capillary force. Therefore, according to the present embodiment, it is possible to reduce the amount of wetback compared to the first embodiment.

  In the present embodiment, the basis weight is clearly divided by the two sheets. However, the present invention is not limited to this, and the basis weight on the skin contact surface side of the top sheet is the skin non-contact surface side. One surface sheet may be used as long as it is lower than the basis weight. In this case, the basis weight of the surface sheet is different continuously or stepwise in the thickness direction of one surface sheet. That is, a gradient is provided in the thickness direction of the topsheet with respect to the basis weight of the topsheet.

  Moreover, in this embodiment, although the hydrophilic difference part 20 and the part from which basic weight differs are formed in the same area | region of a surface sheet, in this invention, it is not restricted to this. However, it is preferable to form the hydrophilic difference portion 20 and the portion having different basis weights in the same region from the viewpoint of reducing the wetback amount.

<Modification>
The present invention is not limited to the above-described embodiments and modifications described anywhere, and appropriate modifications and variations can be made without departing from the technical idea of the present invention.

  For example, the structure of the diaper according to each of the above embodiments is not limited to the unfolded type as described above, and any diaper including a configuration of an absorbent article as defined in the claims can be used. It may be a configuration. For example, the present invention can be applied to a pants-type disposable diaper, a urine pad, and the like.

  In addition, in each said embodiment, although the high-density part 21 is continuously formed in the surface sheet 14, the vertical stripe-shaped arrangement pattern is completed, but it is not restricted to this. For example, as shown in FIG. 8A and FIG. 8B described later, the high-density portion 21 may be intermittently formed on the topsheet 14, and the arrangement pattern of the high-density portion 21 is, for example, Various arrangement patterns such as a polygonal arrangement pattern such as a triangle or a hexagon, a linear pattern, a curved line, or a wavy pattern may be used. Various formation patterns are possible for the recess 22 as well.

  FIG. 8 is a diagram illustrating an example of a formation pattern of the high density portion 21 and the concave portion 22. 8A is a pattern provided in a vertical stripe pattern, FIG. 8B is a pattern provided in a horizontal stripe pattern, FIG. 8C is a pattern provided in an oblique grid pattern, and FIG. 8D is two sawtooth patterns. FIG. 8E shows a pattern in which a plurality of vertically long ellipses are arranged. 8A to 8E, the high density portion 21 is represented by a thick solid line.

  In FIG. 8A, two high density portions 21 formed intermittently are arranged in a straight line in the vicinity of the position on the top sheet 14 and corresponding to the left and right end portions of the absorber 13. . Further, three continuously formed high-density portions 21 are linearly arranged on the topsheet 14 and sandwiched between the two intermittently formed high-density portions 21. . Moreover, in FIG.8 (b), the high density part 21 formed intermittently and the high density part 21 formed continuously are arrange | positioned so that it may mutually be parallel and may become alternate. As shown in FIG. 8A and FIG. 8B, it is possible to change the absorption speed according to the formation location by forming the recess 22 not only continuously but also intermittently. Become. Moreover, it becomes possible to improve the liquid diffusibility in the width direction of the absorber 13 by forming the recessed part 22 as shown in FIG.8 (b). Further, by forming the recess 22 as shown in FIGS. 8C to 8E, not only the longitudinal direction (front-rear direction) of the absorbent body 13 but also the liquid diffusibility in the width direction of the absorbent body 13 is obtained. Can also be improved.

  In each of the above embodiments, the hydrophilicity difference portion 20 is formed on the entire surface of the topsheet 14, but may be formed on a part of the topsheet 14 in the present invention. FIG. 9 is a diagram illustrating a formation example of the hydrophilicity difference portion 20. In the present invention, as shown in FIG. 9, the hydrophilic difference portion 20 can be formed only in a portion where the wetback amount is desired to be reduced as much as possible, for example, in the vicinity of the crotch region 10 </ b> C of the diaper 10.

  In each of the above embodiments, the hydrophilic difference portion 20 and the high density portion 21 are provided only on the topsheet 14, but the present invention is not limited thereto. For example, the hydrophilicity difference portion 20 is such that the hydrophilicity on the skin contact surface side of the composite body of the covering member 18 and the top sheet 14 positioned above the absorbent main body 17 is the skin noncontact surface side of the composite body. It may be formed in the complex so as to be lower than the hydrophilicity of the. Also in this case, the high density part 21 is provided in the hydrophilicity difference part 20 similarly to the said 1st Embodiment. With this configuration, it is possible to obtain the same effect as in the first embodiment.

10 Diaper 10A Fastening tape 10B Front patch sheet 10F Front body area 10R Rear body area 10C Inseam area 10W Waist opening 10L Leg opening 11 Cover sheet 11N, 15N Notch 12 Back sheet 13 Absorber 14 Top sheet 15 Side Sheets 16 and 19 Thread rubber 17 Absorbent body 18 Cover member 20 Different hydrophilic portion 21 High density portion 22 Recess

Claims (9)

An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between the top sheet and the back sheet,
The hydrophilic difference portion formed on the topsheet so that the hydrophilicity on the skin contact surface side of the topsheet is lower than the hydrophilicity on the skin noncontact surface side of the topsheet;
A high density portion provided in the hydrophilic difference portion, and the density of the topsheet is higher than the periphery ; and
A concave portion formed by pressing together the top sheet provided with the high-density portion and the absorbent body so as to at least partially overlap the high-density portion. Absorbent article. The absorbent article according to claim 1 , wherein the high-density portion is disposed at a position corresponding to a bottom portion of the concave portion. The absorption according to claim 1 or 2 , wherein the high-density portion is formed such that the density on the skin contact surface side is lower than the density on the skin non-contact surface side. Sex goods. Wherein the high density portion, in the range where the topsheet covers the absorber, as claimed in any one of claims 1 to 3, characterized in that it is formed by the area ratio of 10-50% Absorbent article. Hydrophilic in the hydrophilic difference portion in the thickness direction of the topsheet, as claimed in any one of claims 1 to 4, characterized in that differ continuously or stepwise Absorbent article. The hydrophilic difference portion includes a first layer located on the skin contact surface side, and a second layer located on the skin non-contact surface side from the first layer,
The absorbent article according to any one of claims 1 to 5 , wherein the hydrophilicity of the first layer is lower than the hydrophilicity of the second layer. The absorbent article according to claim 6 , wherein the basis weight of the first layer is lower than the basis weight of the second layer. Absorption comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, an absorbent main body disposed between the top sheet and the back sheet, and a covering member that covers the absorbent main body A sex product,
The hydrophilicity on the skin contact surface side of the composite body of the covering member and the top sheet positioned above the absorbent main body is lower than the hydrophilicity on the skin non-contact surface side of the composite body. , The hydrophilicity difference part formed in the complex,
Provided on the hydrophilic difference portion, and a high density portion which density of the complex than the surrounding is high,
A concave portion formed by pressing together the topsheet provided with the high-density portion and the absorbent main body covered with the covering member so as to at least partially overlap the high-density portion. An absorbent article comprising: A manufacturing method for manufacturing an absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between the top sheet and the back sheet,
Forming a hydrophilic difference portion on the topsheet so that the hydrophilicity on the skin contact surface side of the topsheet is lower than the hydrophilicity on the skin noncontact surface side of the topsheet;
Forming a high density portion in the hydrophilic difference portion so that the density of the topsheet is higher than the periphery; and
The topsheet of the hydrophilic difference portion and the dense portion is formed, a step of bonding said absorbent body,
Squeezing together the topsheet provided with the high-density portion and the absorbent body to form a recess so that at least a portion thereof overlaps the high-density portion. A featured manufacturing method.