JP2019198583A - Absorbent article - Google Patents

Abstract

To provide an absorbent article which is worn by a wearer by engaging an abdominal part and a back side part by an attachment member, which can acquire preferable fitting feeling and wearing feeling regardless of an attachment position of the attachment member.SOLUTION: A surface sheet 2 comprises a first region 21 and a second region 22 having different physical property with each other, on at least one of both sides of a lateral center line CLy in a lateral direction Y. An attachment region 7 comprises a plurality of display parts indicating an attachment position of the attachment member 6 so as to be visually recognized from outside, the plurality of display parts comprise, a first display part A straddling the lateral center line CLy and a second display part B adjacent to outside of the first display part A in the lateral direction Y. The first region 21 exists in a first display part corresponding region 71 including both of the first display part A and a virtual extension region when the same is extended virtually in a vertical direction X, and the second region 22 exists in a second display part corresponding region 72 including both of the second display part B and a virtual extension region when the same is extended virtually in the vertical direction X.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an absorbent article of a type that is worn by fastening a fastening member on the back side to a fastening region on the ventral side.

  As a disposable diaper which is a kind of absorbent article, a deployable disposable diaper is known. The unfoldable disposable diaper generally has an abdominal side portion disposed on the abdomen side of the wearer, a dorsal side portion disposed on the back side, and a crotch portion positioned between them. The side flap on the back side is extended to the wearer's abdomen and the fastening member provided on the side flap is fastened to a predetermined fastening region on the outer surface of the abdomen. Accordingly, the diaper can be appropriately tightened around the waist and fixed so as not to slip off. Patent Document 1 describes a deployable disposable diaper in which target printing (for example, numbers and illustrations) that serves as a guide for the fastening position of the fastening member is visible.

  For the purpose of reducing the contact area between the surface sheet and the skin of the wearer to improve air permeability and reducing stickiness to the skin, the absorbent sheet is directed toward the wearer's skin side. A technique for forming irregularities on the skin facing surface by embossing or the like is known. For example, in Patent Document 2, in a deployable disposable diaper including a surface sheet having irregularities formed on a skin-facing surface and an absorbent body having a low-rigidity region and a high-rigidity region, the low-rigidity region in the surface sheet It is described that the uneven pattern is made different between a corresponding portion and a portion corresponding to the high-rigidity region.

JP-A-2015-223257 JP 2017-104502 A

  Absorbent articles that are worn by engaging the abdomen and the dorsal side with fastening members, for example, deployable disposable diapers, generally have a newborn size, S size, M size, L size, etc. per one type of product. A plurality of types having different chassis sizes are prepared, and a wearer or a guardian thereof selects one that matches the wearer's body size (girth circumference). In addition, since many of such absorbent articles have a certain width in the range of wearer's body sizes that can be accommodated in each chassis size, for example, as a chassis size that fits the wearer's body size Even if the M size is selected, the selected M size absorbent article includes a size that is smaller or larger than the wearer's actual body size, and is not immediately fit when worn. The fitting position can be obtained by adjusting the fastening position of the fastening member when wearing the absorbent article and matching the chassis size (the circumference of the waistline opening of the absorbent article) with the waist circumference of the wearer Yes.

  In this way, commercially available disposable disposable diapers have multiple chassis sizes, and each chassis size has a certain range that encompasses the actual body size of the wearer. The fastening position of the fastening member varies depending on whether the size is large or small. And, due to the difference in the fastening position, in the diaper waist opening formed along the wearer's body line, the overlapping state of each member and the degree of force applied to each member are different, resulting in the diaper There is a risk of a decrease in fit and wearing feeling.

  For example, if the diaper chassis size is larger than the wearer's body size and the diaper is fitted to the wearer's body, the fastening position of the fastening member is usually the position of the abdomen of the wearer. The center of the diaper corresponding to the vicinity of the center of the wearer's abdomen, while the side along the vertical direction of the diaper of the diaper is in contact with the skin in a free state at the fastening position. Since a relatively strong pressing force is applied to the part, a gap is generated between the skin and the diaper in the flank and the vicinity thereof, and the skin is strongly tightened in the vicinity of the center of the abdomen. Conversely, if the chassis size of the diaper is smaller than the wearer's body size, the fastening position of the fastening member that provides a fit is usually laterally outward from the center of the wearer's abdomen. At that fastening position, the entire abdomen side of the diaper is pulled laterally outward by the fastening member, so that a relatively strong pressing force is applied to the entire abdomen, causing a burden on the skin and a feeling of wearing is reduced. To do.

  A commercially available unfoldable disposable diaper is designed so that when the chassis size of the diaper is larger or smaller than the wearer's body size, the displacement of both sizes is adjusted at the fastening position of the fastening member. Therefore, it is ideal that a good fit and wearing feeling can be obtained regardless of the fastening position, but as described above, conventional diapers have not reached such ideal form. . In order to make a diaper that provides a good fit and wearing feeling regardless of the fastening position, it is possible to design products that individually correspond to various fastening positions, but such product design is a reality. Not right.

  On the other hand, as described in Patent Document 1, commercially available unfolded disposable diapers include one in which a display portion serving as a guide for a fastening position is provided in a fastening region of the fastening member. By fixing the fastening member to the part, the diaper can be worn with good fit. In addition, such a display area display unit is convenient for storing a fixing position where the mother fits the infant, for example, when the mother with the infant is changing diapers on a daily basis. It is. If such an appropriate fastening position is memorized by the person who puts the diaper on the wearer rather than the diaper's wearer, it can be helpful to quickly perform work related to detachment of the diaper, such as changing diapers.

  However, depending on the degree of deviation between the chassis size range of the diaper to be worn and the body size of the wearer, even if the fastening member is fastened to the display portion of the fastening region, a good fit and feeling of wearing May not be obtained, and the fit or the like may be better if it is fixed to a part other than the display part. Absorbent articles that provide a good fit and a good feeling of wear with little contact on the skin, without causing any gaps around the waist of the wearer, regardless of the fastening position of the fastening member, are still provided. Not.

  Accordingly, the present invention is an absorbent article that is worn by engaging the abdomen and the back with a fastening member, and has a good fit and wearing feeling regardless of the fastening position of the fastening member. It relates to providing the resulting absorbent article.

  The present invention has a longitudinal direction corresponding to the longitudinal direction of the wearer and a lateral direction perpendicular thereto, and an absorbent body and a surface sheet disposed closer to the wearer's skin than the absorbent body. The absorbent article has in the longitudinal direction a belly side portion disposed on the wearer's belly side and a back side portion disposed on the back side and a crotch portion positioned therebetween, wherein the topsheet is The absorbent article has a first region and a second region having different physical properties on at least one of the lateral sides of the boundary with a lateral center line extending in the longitudinal direction by dividing the absorbent article into two equal parts. In addition, fastening members are provided on both side edges along the longitudinal direction of the back side portion, and a fastening region where the fastening member can be fastened to the non-skin facing surface of the abdominal side portion A plurality of tables that are provided so as to straddle the center line and indicate the fastening position of the fastening member in the fastening region. The plurality of display units include a first display unit straddling the horizontal center line and a second display unit adjacent to the outside of the first display unit in the lateral direction. Including the first display portion and the first display portion corresponding region including both the first display portion and the virtual extension region when the first display portion is virtually extended in the vertical direction. Absorption in which the second region of the topsheet is present in the second display portion corresponding region, including both the second display portion and the virtual extension region when the second display portion is virtually extended in the vertical direction. It provides a sex product.

  According to the present invention, the absorbent article is worn by engaging the abdomen and the dorsal side with a fastening member, and has a good fit and wearing feeling regardless of the fastening position of the fastening member. An absorbent article from which can be obtained is provided.

FIG. 1 is a schematic perspective view of a disposable diaper that is an embodiment of the absorbent article of the present invention. FIG. 2 is a plan view schematically showing the skin-facing surface, that is, the surface sheet side of the diaper shown in FIG. 1, and is a plan view in a developed state in which elastic members of respective parts are extended and spread in a flat shape. FIG. 3 is a cross-sectional view schematically showing a cross section taken along line II of FIG. FIG. 4 is a plan view schematically showing the ventral side of the diaper in FIG. 2 and is a diagram showing the relationship between each part of the topsheet and each part of the fastening region. FIG. 5 is an enlarged schematic view showing a cross section of the opening formed in the top sheet according to the present invention. FIG. 6 is a view corresponding to FIG. 4 of 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.

  Hereinafter, the absorbent article of this invention is demonstrated with reference to drawings based on the preferable embodiment. The disposable diaper 1 which is one Embodiment of the absorbent article of this invention is shown by FIGS. 1-3. The diaper 1 has a longitudinal direction X corresponding to the wearer's front-rear direction (a direction extending from the wearer's abdomen side to the back side through the crotch part) and a transverse direction Y orthogonal thereto, and the wearer A longitudinal side X includes an abdominal side F disposed on the ventral side (front side), a back side R disposed on the back side (rear side), and a crotch M positioned therebetween. The crotch part M includes a non-illustrated excretory part facing part that is opposed to the excretion part of the wearer when worn. The excretory part opposing part is normally in a position biased slightly closer to the back side R than the central part in the longitudinal direction X of the diaper 1.

  As shown in FIG. 2, the diaper 1 has a vertically long shape in the longitudinal direction X in a plan view in a state where the diaper is spread in a planar shape, the longitudinal direction coincides with the longitudinal direction X, and the width direction is the lateral direction Y. It matches. The diaper 1 has both side edges along the longitudinal direction X curved in an inward arc shape in the central portion of the longitudinal direction X including the crotch M, and in the plan view as shown in FIG. The section is in the shape of an hourglass with an inner part. In the present embodiment, the diaper 1 is formed symmetrically on both sides with respect to a horizontal center line CLy extending in the vertical direction X by equally dividing the diaper 1 in the horizontal direction Y.

  As shown in FIGS. 2 and 3, the diaper 1 is disposed on the absorbent body 4 and a position closer to the skin of the wearer than the absorbent body 4, that is, on the skin facing surface side of the absorbent body 4. A liquid-permeable top sheet 2 that can come into contact with the skin, and a liquid-impermeable back sheet 3 that is disposed farther from the wearer's skin than the absorbent body 4, that is, on the non-skin-facing surface side of the absorbent body 4. It comprises. Here, the liquid impermeability is a concept including poor liquid permeability, and includes cases where the back sheet 3 is made of a water-repellent sheet or the like in addition to the case where the liquid does not pass through the liquid at all.

  In the present specification, the “skin-facing surface” is a surface of the absorbent article or a component thereof (for example, the surface sheet 2) that is directed toward the wearer's skin when the absorbent article is worn, that is, the wearer's skin. The side close to the skin, and the “non-skin facing surface” is directed to the side opposite to the skin side when the absorbent article is worn, that is, the side that is relatively far from the wearer's skin. It is the surface that is. In addition, "at the time of wearing" here means the state in which the normal proper wearing position, that is, the correct wearing position of the absorbent article is maintained.

  As shown in FIG. 2, the top sheet 2 covers the entire skin facing surface of the absorbent body 4. In the present embodiment, the lateral length (maximum length) of the top sheet 2 is the same as that of the absorbent body 4, and the top sheet 2 is accommodated in the side edges 4S and 4S along the longitudinal direction X of the absorbent body 4. ing. On the other hand, the back sheet 3 covers the entire area of the non-skin facing surface of the absorbent body 4, and further extends outward in the lateral direction Y from both side edges 4S, 4S of the absorbent body 4, and side flaps together with the side sheet 5 described later. Forming part. The side flap portion is a portion of the diaper 1 made of a member that extends outward in the lateral direction Y from the absorbent body 4. The back sheet 3 and the side sheet 5 are joined to each other by known joining means such as an adhesive, heat seal, ultrasonic seal, and the like at the extended portions from both side edges 4S, 4S of the absorber 4. The top sheet 2 and the back sheet 3 may be bonded to the absorber 4 with an adhesive. As the top sheet 2 and the back sheet 3, various types conventionally used for this type of absorbent article can be used without particular limitation. For example, as the surface sheet 2, a single layer or multilayer nonwoven fabric, an apertured film, or the like can be used. As the back sheet 3, a moisture-permeable resin film or the like can be used.

  The absorbent body 4 includes a liquid-absorbent absorbent core 40 that forms the main body of the absorbent body 4, and a liquid-permeable core wrap sheet 41 that covers the outer surface of the absorbent core 40. The absorbent core 40 has a shape that is long in the longitudinal direction X in a plan view as shown in FIG. 2, and the longitudinal direction of the absorbent core 40 coincides with the longitudinal direction X of the diaper 1 and is perpendicular to the longitudinal direction. The width direction of the core 40 coincides with the lateral direction Y of the diaper 1. The absorbent core 40 and the core wrap sheet 41 may be joined by an adhesive such as a hot-melt adhesive. The absorptive core 40 can be comprised from the laminated body of liquid absorbent fibers, such as a pulp fiber, the mixed fiber body of a liquid absorbent fiber and a water absorbing polymer, or the laminated body only of a water absorbing polymer, for example. . Examples of the liquid-absorbing fibers include cellulose-based hydrophilic fibers such as pulp fibers, rayon fibers, cotton fibers, and cellulose acetate. Besides the cellulose-based hydrophilic fibers, polyolefins, polyesters, polyamides, etc. A fiber made of a synthetic resin and made hydrophilic by a surfactant or the like can also be used. As the core wrap sheet 41, for example, tissue paper or a water-permeable nonwoven fabric is used. As shown in FIG. 2, the core wrap sheet 41 may cover the absorbent core 40 with a single sheet, and although not shown, two or more sheets may be combined to cover the absorbent core 40. Further, the absorbent body 4 may not include the core wrap sheet 41.

  As shown in FIGS. 2 and 3, on both sides of the skin facing surface of the diaper 1 in the longitudinal direction X, side sheets (leakproof cuff forming sheets) 5 having elastic members 11 are arranged, and the elastic members 11, a pair of leak-proof cuffs standing on the skin side of the wearer is formed in the crotch M in the worn state. Moreover, the leg part elastic member 12 is distribute | arranged to the site | part distribute | arranged around the wearer's leg in the crotch part M, and it is arrange | positioned by the contraction to the crotch part M in a wear state to the circumference | surroundings of a wearer's leg. Leg gathers are formed to improve the fit.

  The diaper 1 is a so-called unfolded disposable diaper. As shown in FIG. 2, the fastening member 6 is provided on both side edges along the longitudinal direction X of the back side R of the diaper 1. A fastening region 7 where the fastening member 6 can be fastened to the non-skin facing surface of F is provided so as to straddle the lateral center line CLy. In order to wear the diaper 1, the abdominal side F and the back side R are engaged by the fastening member 6, specifically, the fastening member 6 may be fastened to the fastening region 7. A fastening part 61 made of a male member of a mechanical surface fastener is attached to the fastening member 6. The fastening region 7 is formed by joining a female member of a mechanical hook-and-loop fastener to the non-skin facing surface of the back sheet 3 that forms the non-skin facing surface of the ventral side F by a known joining means such as an adhesive or heat seal. The fastening part 61 of the fastening member 6 can be detachably fastened. In addition, the fastening part 61 is not limited to the male member of a mechanical surface fastener, For example, an adhesive may be sufficient.

  As shown in FIG. 4, a plurality of display portions indicating the fixing positions of the fixing members 6 are provided in the fixing region 7 so as to be recognized from the outside, and the plurality of display portions are arranged on the horizontal center line CLy. And a second display portion B that is adjacent to the outside of the first display portion A in the lateral direction Y. Further, in the present embodiment, the third display unit C is provided on the outside of the second display unit B in the lateral direction Y in the fastening region 7 so as to be recognized from the outside. In the present embodiment, the letters A, B, or C are printed on the surface of each display unit in the fastening region 7 so as to be visually recognized, whereby each display unit can be recognized from the outside. In the present invention, the display portion of the fastening area is not limited to such a printed matter (display portion that can be visually recognized) such as characters and designs, and various displays are possible without departing from the spirit of the present invention. For example, a display unit appealing to the sense of touch, which can be recognized by touching with a finger, may be used.

  In the present embodiment, the fastening region 7 has a rectangular shape in plan view, and the longitudinal direction thereof coincides with the lateral direction Y, so that the outer surface of the back sheet 3 of the abdominal side F, that is, the lateral direction Y of the non-skin facing surface. It is fixed at the center. And the 1st display part A is located in the center part of the longitudinal direction (horizontal direction Y) of the fixation area | region 7, and a pair of 2nd display part B is formed in the both sides of the horizontal direction Y of this 1st display part A. Is located, and a pair of third display portions C are located on both outer sides in the lateral direction Y of the pair of second display portions B.

  The display parts A to C of the fastening region 7 serve as a guide for an appropriate fastening position of the fastening member 6 for obtaining a good fit and wearing feeling when the diaper 1 is worn. In other words, the diaper 1 is designed for a plurality of body sizes, and is fitted to the wearer's body size (girth circumference) by fastening the fastening member 6 to any one of the display parts A to C. In addition, the skin does not have a gap around the wearer's waist, and it adheres well to the skin, resulting in a good fit and a feeling of wear with little burden on the skin. However, this is realized when the wearer's body size is compatible with several body sizes that the diaper 1 can handle, and when the difference between the two is large, there is a problem as described above. That is, for example, when the body size of the wearer greatly exceeds the corresponding body size of the diaper 1, the fastening position of the fastening member 6 is the central portion in the lateral direction Y of the ventral side F (the abdomen of the wearer Since the skin is strongly tightened at the center, there is a risk of adverse effects on the wearing feeling. Also, both sides of the center (corresponding to the flank and its vicinity). In the portion to be), there is a possibility that a gap is generated between the skin and the diaper 1 to adversely affect the fit. Conversely, when the wearer's body size is significantly smaller than the corresponding body size of the diaper 1, the fastening position of the fastening member 6 is the both sides of the abdominal side F in the lateral direction Y (the flank and its belly). Therefore, the entire abdominal side F is pulled outward in the lateral direction Y by the pair of fastening members 6 and 6, so that the abdomen is entirely compressed and the feeling of wear is adversely affected. There is a risk.

  Such a situation where the discrepancy between the actual body size of the wearer and the corresponding body size of the absorbent article is relatively large often occurs, and the fastening position (diaper recommended by the absorbent article manufacturer, etc.) 1, there is a demand for an absorbent article that can provide a good fit and a feeling of wearing even when the fastening member is unavoidably fastened to positions other than the display portions A to C) of the fastening region 7.

  As a result of various studies conducted by the present inventors in order to meet such a demand, the inventors have obtained knowledge that it is effective to partially change the physical properties of the surface sheet provided in the absorbent article, and as a result of further investigation, It was found that it is effective to increase the thickness (apparent thickness) of the central portion in the lateral direction in comparison with both side portions in the same direction. In addition, as another finding, the rigidity of the center part in the lateral direction of the top sheet is lowered in comparison with both side parts in the same direction, that is, the center part in the lateral direction of the top sheet is a low rigidity and flexible part. It was found that it is effective to make both sides of the sheet in the lateral direction highly rigid and relatively hard.

  The absorbent article of the present invention has been made on the basis of such knowledge. As shown in FIG. 4, the topsheet 2 has a lateral center line CLy of the diaper 1 as a boundary, and the boundary sheet has a lateral direction Y on both sides. At least one has a first region 21 and a second region 22 having different physical properties. In this embodiment, the surface sheet 2 has the 1st area | region 21 and the 2nd area | region 22 in each of the both sides of the horizontal direction Y on both sides of the horizontal centerline CLy of the diaper 1. And the 1st field of top sheet 2 is included in the 1st display part corresponding field 71 including both the 1st display part A and the virtual extension field at the time of extending the 1st display part A in the lengthwise direction X virtually. 21 and the second display portion corresponding region 72 including both the second display portion B and the virtual extension region when the second display portion B is virtually extended in the vertical direction X. There are two second regions 22.

  In the diaper 1 of the present embodiment, as shown in FIG. 4, the first region 21 is formed when the leakage prevention cuff (side sheet 5) in the topsheet 2 is laid down in the lateral direction Y. It is arranged only in a portion that does not overlap with the cuff, and is not arranged in a portion that overlaps with the leak-proof cuff that has fallen inward in the lateral direction Y. The 2nd field 22 is arranged in the portion which overlaps with the above-mentioned leak-proof cuff laid inward in the horizontal direction Y in surface sheet 2.

  Moreover, in the diaper 1 of this embodiment, as shown in FIG. 4, the 1st area | region 21 of the surface sheet 2 exists only in the 1st display part corresponding | compatible area | region 71, and exists in the 2nd display part corresponding | compatible area | region 72. Absent. Further, the second region 22 of the top sheet 2 exists only in the second display portion corresponding region 72 and does not exist in the first display portion corresponding region 71. That is, the boundary between the first display part A and the second display part B in the fastening region 7 and the boundary between the first region 21 and the second region 22 in the topsheet 2 coincide.

  Moreover, in the diaper 1 of the present embodiment, as shown in FIG. 4, the third display unit C includes a third display unit C and a virtual extension region when the third display unit C is virtually extended in the vertical direction X. In the display portion corresponding region 73, the topsheet 2 does not exist, and therefore the first region 21 and the second region 22 do not exist.

  As described above, in the surface sheet 2, the first region 21 and the second region 22 have different physical properties. Specifically, as shown in FIG. 4, a plurality of convex portions 23L and 23S protruding toward the wearer's skin side are scattered on the skin facing surface of the topsheet 2 and the periphery of the convex portions 23L and 23S. In the first region 21 and the second region 22, the heights of the convex portions 23L and 23S are different from each other, and the height of the convex portion is one of the physical properties. is there. That is, the convex portion 23L existing in the first display portion corresponding region 71 located in the central portion of the diaper 1 in the horizontal direction Y is formed in the second display portion corresponding region 72 located outside the horizontal direction Y of the region 71. Compared with the existing convex portion 23S, the “height”, that is, the “projection height from the non-convex portions (the concave portion 24 in the illustrated embodiment) around the convex portions 23L and 23S” is higher.

  As described above, in the topsheet 2 having the unevenness formed on the skin facing surface, the convex portion 23L of the first region 21 overlapping the first display portion A at the center in the lateral direction Y, and the first display portion A For example, the body size of the wearer can be determined by establishing a size relationship of the convex portion 23L> the convex portion 23S with respect to the height with the convex portion 23S of the second region 22 overlapping the second display portion B located on both sides. In the case where the corresponding body size of the diaper 1 is greatly exceeded, in the case where the fastening position of the fastening member 6 is the central portion in the lateral direction Y of the ventral side F in accordance with the conventional practice, the projecting height is relatively high. Since the first region 21 of the topsheet 2 having a high convex portion 23L is strongly pressed against the wearer's skin, the skin of the flank and the vicinity thereof and the diaper 1 that has conventionally occurred in such a case It is difficult to form a gap between them, and the diaper at the waistline 1 adhesion can be improved. In addition, for example, when the body size of the wearer is significantly smaller than the corresponding body size of the diaper 1, the fastening position of the fastening member 6 is set to the both sides in the lateral direction Y of the ventral side F according to the custom. The second region 22 of the topsheet 2 having the convex portion 23S having a relatively low projecting height is strongly pressed against the wearer's skin, but the convex portion 23S is compared to the convex portion 23L. Because of its low height, it is hard and difficult to deform, so it is difficult to deform even if it is strongly pressed against the skin in this way, so a level of pressing force that does not create a gap between the diaper 1 and the skin of the wearer As a result, the entire surface sheet 2 in the waistline portion is in close contact with the skin, thereby reducing leakage.

  That is, when the size of the diaper 1 is larger than the wearer's body size, the fastening position in the fastening region 7 of the fastening member 6 is normally the first display portion including the lateral center line CLy and the vicinity thereof. Therefore, a relatively large force is applied to the first display portion A at the time of fastening. However, such a large force is not applied to the second display portion B located outside the first display portion A in the lateral direction Y. Absent. Therefore, in the diaper 1 of the present embodiment, the surface sheet 2 that directly contacts the skin of the wearer in consideration of the force applied when the fastening member 6 is fastened to the fastening region 7. The physical properties of the skin facing surface, specifically, the heights of the convex portions 23L and 23S (apparent thickness of the topsheet) are displayed on the first display portion corresponding region 71 corresponding to the first display portion A and the second display portion B. As described above, the corresponding second display portion corresponding region 72 is made different so as to equalize the degree of application of such force. Further, when the size of the diaper 1 is smaller than the body size of the wearer, the fastening position in the fastening region 7 of the fastening member 6 is usually compared with the lateral center line CLy outward in the lateral direction Y. Since it becomes the 2nd display part B in the position away from the target, a strong force is generally applied from the 2nd display part B to the 1st display part A at the time of fixation, but also in this case, the top sheet 2 By differentiating the heights (apparent thickness of the surface sheet) of the convex portions 23L and 23S on the skin-facing surface as described above, the feeling of pressure on the abdomen can be eased and the burden on the skin can be reduced.

  From the viewpoint of ensuring the above-described effects, the ratio of the area of the first region 21 (area ratio of the first region 21) to the total area of the skin facing surface of the topsheet 2 is preferably Is 30% or more, more preferably 40% or more, and preferably 70% or less, more preferably 60% or less. Further, the ratio of the area of the second region 22 (area ratio of the second region 22) to the total area of the skin facing surface of the topsheet 2 is preferably 30% or more, more preferably 40% or more, and Preferably it is 70% or less, More preferably, it is 60% or less. In addition, regarding the area ratio of the second region 22, the “area of the second region 22” necessary for calculating this is, for example, as shown in FIG. 4, the second region 22 on the skin facing surface of the topsheet 2. When there are a plurality (two in FIG. 4), it means the total area of each of the plurality of second regions 22. The same applies to the “area of the first region 21” necessary for calculating the area ratio of the first region 21.

  There are various “physical properties” of the surface sheet of interest in the present invention other than the “height of the convex portion”. The “physical properties” as used herein widely includes physical properties such as mechanical properties (mechanical properties) exhibited by the surface sheet, and the properties appearing in the outer shape of the surface sheet, such as the height of the convex portion. In addition, there is a property that does not appear in the outer shape of the surface sheet, that is, a property that the first region and the second region cannot be distinguished from each other at a glance.

  The following (1)-(3) can be illustrated as said "physical property" of the surface sheet which pays attention by this invention, ie, the physical property which is different in the 1st area | region 21 and the 2nd area | region 22 of the surface sheet 2. FIG. The first region 21 and the second region 22 of the surface sheet 2 may be different in one or more physical properties selected from the group consisting of the following (1) to (3).

(1) Height of the convex portions 23L and 23S when a plurality of convex portions 23L and 23S projecting toward the skin side of the wearer are formed on the skin facing surface of the top sheet 2 (2) Top sheet 2 Bending stiffness (3) MMD value of skin facing surface of topsheet 2

  The first region 21 of the topsheet 2 existing in the first display portion corresponding region 71 located in the central portion of the diaper 1 in the lateral direction Y from the viewpoint of more surely achieving the above-described predetermined effect of the present invention. The height of the convex portion is high (the apparent thickness is large) in comparison with the second region 22 of the topsheet 2 existing in the second display portion corresponding regions 72 located on both sides in the lateral direction Y of the diaper 1. It is preferable that it has the characteristics of being bulky, soft, easily crushed and easily deformed, fluffy and slippery. In other words, the second region 22 of the topsheet 2 is harder than the first region 21 of the topsheet 2 and has a low height (small apparent thickness), hard, and hardly deformed, It is preferable to have a feature that it is difficult to slip. Considering the above, it is preferable to set (1) to (3) as follows.

Regarding (1), the ratio of the height 23LH (see FIG. 3) of the convex portion 23L of the first region 21 to the height 23SH (see FIG. 3) of the convex portion 23S of the second region 22 is “height 23LH. > 23SH / height 23SH, preferably 1.1 or higher, more preferably 1.3 or higher, and preferably 5.0 or lower, more preferably 2.0 or lower. is there.
The height 23LH of the convex portion 23L is preferably 2.0 mm or more, more preferably 2.5 mm or more, and preferably 10 mm or less, more preferably 6.0 mm or less.
The height 23SH of the convex portion 23S is preferably 1.5 mm or more, more preferably 2.0 mm or more, and preferably 10 mm or less, more preferably 6.0 mm or less.
The height (projection height) of the convex portions 23L and 23S of the topsheet 2 is measured by the following method. With regard to (1) above, the diaper 1 is worn regardless of the fastening position in the fastening region 7 of the fastening member 6 by setting the protruding height of the projections of each region of the topsheet 2 as described above. A good fit can be obtained without increasing the burden on the person's skin, and the effect of reducing the gap between the waistline of the diaper 1 and the skin can be achieved more reliably.

<Measurement method of height of convex part of surface sheet>
The surface sheet to be measured is cut with a sharp razor along the thickness direction, the cut surface is observed, and the height of the convex part on the skin facing surface under no load of the surface sheet is measured. For example, on the cut surface of the topsheet 2 under no load as shown in FIG. 3, a virtual straight line VL that connects both ends of the contour line of one convex portion 23L to be measured (the root of the convex portion 23L) is drawn, The shortest distance between the virtual straight line VL and the top of the convex portion 23L is measured, and the measured value is taken as the height of the convex portion 23L. It measures similarly about the height 23SH of the convex part 23S. The means for observing the cut surface of the topsheet is not particularly limited, and may be the naked eye, or an optical microscope may be used. When using an optical microscope, it can be observed at a magnification of 20 to 100 using, for example, a microscope (VHX-100 manufactured by KEYECE). Further, when an external force has been applied to the surface sheet to be measured for a long time, specifically, for example, it is incorporated into an absorbent article such as a disposable diaper, and the absorbent article is stored in a state of being compressed and filled into a package. In order to eliminate the influence of the external force, the surface sheet is taken out from the absorbent article and left for one day or more in an environment of normal temperature and pressure and cut with a razor as described above.

Regarding (2) above, the ratio of the bending stiffness 21b of the first region 21 and the bending stiffness 22b of the second region 22 is based on the premise that “bending stiffness 21b <bending stiffness 22b”. It is preferably 0.2 or more, more preferably 0.3 or more, and preferably 0.9 or less, more preferably 0.8 or less.
The bending rigidity 21b of the first region 21 is preferably 10 cN or more, more preferably 15 cN or more, and preferably 50 cN or less, more preferably 40 cN or less.
The bending rigidity 22b of the second region 22 is preferably 15 cN or more, more preferably 20 cN or more, and preferably 70 cN or less, more preferably 50 cN or less.
The bending rigidity of the top sheet 2 is measured by the following method. It can be evaluated that the smaller the measured value of the bending rigidity, the lower the rigidity of the measurement object, and the easier it is to bend. Therefore, regarding (2), by setting the bending rigidity of each region of the topsheet 2 as described above, the skin of the wearer of the diaper 1 regardless of the fastening position in the fastening region 7 of the fastening member 6. A good fit can be obtained without increasing the burden on the diaper, and the effect that the gap between the waistline of the diaper 1 and the skin is reduced can be more reliably achieved.

<Measurement method of bending rigidity of surface sheet>
According to the ring crush method JIS P8126. Specifically, a predetermined measurement target part is cut out from the surface sheet to obtain a measurement sample. For example, from each of the first region 21 and the second region 22 of the surface sheet 2, a rectangular portion having a length of 30 mm in the vertical direction X and a length of 110 mm in the horizontal direction Y is cut out to form a test piece. The test piece is skinned in the longitudinal direction with the skin facing surface facing outside, and one end and the other end in the longitudinal direction of the test piece are fastened with an ultrasonic seal to form a cylindrical shape with a height of 30 mm. A measurement sample is prepared. The prepared cylindrical measurement sample is set up so that its axial direction coincides with the vertical direction, and the measurement sample is compressed in the axial direction from its upper end side at a compression speed of 10 mm / min using a compression tester. Record the maximum load shown at times. Five measurement samples are prepared for each measurement target part, and each maximum load is measured. The average value thereof is set as the bending rigidity value of the measurement target part (for example, the first region 21 or the second region 22). .

Regarding (3), the ratio between the MMD value 21c of the skin facing surface of the first region 21 and the MMD value 22c of the skin facing surface of the second region 22 is based on the assumption that “MMD value 21c <MMD value 22c”. The coefficient 21c / friction coefficient 22c is preferably 0.2 or more, more preferably 0.25 or more, and preferably 0.9 or less, more preferably 0.8 or less.
The MMD value 21c of the skin facing surface of the first region 21 is preferably 0.0060 or more, more preferably 0.0070 or more, and preferably 0.0090 or less, more preferably 0.0080 or less.
The MMD value 22c of the skin facing surface of the second region 22 is preferably 0.0060 or more, more preferably 0.0070 or more, and preferably 0.010 or less, more preferably 0.0090 or less.
The MMD value of the skin facing surface of the topsheet 2 is measured by the following method.

<Measurement method of MMD value of skin facing surface of surface sheet>
Using a commercially available MMD measuring instrument (KES-FB4 surface tester manufactured by Kato Tech Co., Ltd.), the friction surface attached to the MMD measuring instrument on the surface to be measured, that is, the skin facing surface (formation surface of the convex portion) of the surface sheet The MMD value in the longitudinal direction (direction corresponding to the wearer's front-rear direction) of the absorbent article having the topsheet is measured under the conditions of SENS: 2 × 5, load 50 gf / cm ² .

  The MMD value is an index of the surface roughness of the measurement object, and it can be evaluated that the surface of the measurement object is smoother as the MMD value is smaller. And when the MMD value of the skin facing surface of the topsheet 2 is relatively small, the skin facing surface is smooth and has little friction with the skin of the wearer of the diaper 1, and when the MMD value is relatively large The skin-facing surface is rough and friction with the skin of the wearer of the diaper 1 is relatively large. Therefore, with respect to (3) above, by setting the MMD value as described above, the friction between the first region 21 and the skin that is relatively slippery and relatively slippery on the skin facing surface of the topsheet 2 and the skin. Is formed with a relatively large and non-slipable second region 22, thereby increasing the burden on the skin of the wearer of the diaper 1 regardless of the fastening position in the fastening region 7 of the fastening member 6. A good fit and a feeling of wearing are obtained, and the effect that the gap between the waistline of the diaper 1 and the skin is reduced can be achieved more reliably.

  The top sheet 2 may be formed with an opening that penetrates the top sheet 2 in the thickness direction. When such a hole is formed in the surface sheet 2, air permeability, liquid permeability, and the like can be improved. FIG. 5 shows an opening 25 as an example of an opening formed in the top sheet 2. The opening 25 is a three-dimensional opening having an extending portion (opening wall extending portion) 25 </ b> E that extends outward from the one surface of the topsheet 2 in the thickness direction. The extending part 25 </ b> E is typically formed on the non-skin facing surface of the topsheet 2, and in that case, the diaper 1 extends toward the absorber 4. The extending portion 25E has a cylindrical shape that gradually decreases in diameter as it goes outward in the thickness direction (when applied to the diaper 1, it goes toward the absorber 4). Since such a three-dimensional opening 25 is formed in the top sheet 2, it becomes easy for capillary force to act, and body fluid such as urine existing on the skin facing surface of the top sheet 2 can be easily transferred to the absorber 4. In addition, liquid return is less likely to occur. In particular, when the extending portion 25E is formed on the non-skin facing surface of the topsheet 2 and extends toward the side opposite to the skin side of the wearer, the permeability of the low-viscosity discharged matter (for example, soft stool) is improved. improves.

  The topsheet 2 may be formed with a high density portion having a higher density than the peripheral portion. That is, the surface sheet 2 may include a high density portion and a low density portion having a lower density than the high density portion. When the high-density part is formed in the surface sheet 2, the transition of the body fluid to the absorber 4 becomes even smoother. The “high density part having a higher density than the peripheral part” in the top sheet 2 is typically a part (squeezed part) formed by pressing the top sheet 2 from one surface side. The periphery of the density part (non-pressed part) is a low density part having a lower density than the high density part. In order to form the high-density portion, the pressing may be accompanied by melting of the constituent fibers of the topsheet 2 or may be only compression of the topsheet 2 without melting. Examples of the former expression include embossing with heat and ultrasonic embossing. In the high-density part formed by pressing with melting of the constituent fibers of the surface sheet 2, the constituent fibers are thermally fused, and depending on the degree of melting, the constituent fibers lose their original fibrous form. It may be filmed.

  The principal part of other embodiment of the absorbent article of this invention is shown by FIGS. In other embodiments to be described later, constituent parts different from those of the above-described embodiment will be mainly described, and the same constituent parts are denoted by the same reference numerals and description thereof will be omitted. The description about the diaper 1 of the said embodiment is applied suitably to the component which is not demonstrated especially about other embodiment mentioned later.

  In the diaper 1 </ b> A shown in FIG. 6, the first region 21 is from a portion of the topsheet 2 that does not overlap the leakproof cuff when the leakproof cuff (side sheet 5) is laid down in the lateral direction Y. It extends to both sides in the lateral direction Y, and is also disposed on the portion overlapping the leak-proof cuff. Further, the top sheet 2 extends outward in the lateral direction Y from both side edges 4S, 4S of the absorbent body 4, and the second region 22 is arranged across the lateral edge 4S of the absorbent body 4 in the lateral direction Y. Has been. The same effect as the diaper 1 is produced by the diaper 1A.

  The diaper 1B shown in FIG. 7 is different from the diaper 1A shown in FIG. 6 in the arrangement of the fastening parts A to C in the fastening region 7. That is, in the diaper 1 </ b> B, the first area 21 of the topsheet 2 extends from the first display area corresponding area 71 to the second display area corresponding area 72, that is, in the second display area corresponding area 72. Area 21 exists. Moreover, in the diaper 1B, the 2nd area | region 22 of the surface sheet 2 is extended from the 2nd display part corresponding | compatible area | region 72 to the 3rd display part corresponding | compatible area | region 73, that is, with the 1st display part corresponding | compatible area | region 71. The second region 22 exists on the opposite side (third display portion corresponding region 73). The effect similar to diaper 1 is show | played also by diaper 1B.

  In the diaper 1 </ b> C shown in FIG. 8, the second region 22 extends laterally from the portion of the topsheet 2 that overlaps the leakproof cuff when the leakproof cuff (side seat 5) is laid inward in the lateral direction Y. It extends inward in the direction Y and is also arranged on a portion that does not overlap the leak-proof cuff. The second area 22 extends from the second display area corresponding area 72 to the first display area corresponding area 71, that is, the second area 22 exists in the first display area corresponding area 71. The effect similar to diaper 1 is show | played also by diaper 1C.

  In the diaper 1 </ b> D shown in FIG. 9, the second region 22 of the topsheet 2 extends from the second display portion corresponding region 72 to the opposite side of the first display portion corresponding region 71, that is, the third display portion corresponding region 73. Except for the point, it is the same as the diaper 1C shown in FIG. The same effect as the diaper 1 is produced by the diaper 1D.

Although the present invention has been described above, the present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit of the present invention. All the parts of only the one embodiment described above can be used together as appropriate.
For example, the topsheet 2 may have a third region having physical properties different from those of the second region 22 on the outer side in the lateral direction Y of the second region 22 (on the side opposite to the first region 21 side). Good. More specifically, for example, in the diaper 1 shown in FIG. 4, the third region having a physical property different from that of the first region 21 as well as the second region 22 may exist in the third display portion corresponding region 73. .

  The absorbent article of the present invention broadly includes articles used for absorbing body fluids (urine, menstrual blood, loose stool, sweat, etc.) discharged from the human body, and the application range is not limited to deployable disposable diapers.

1,1A, 1B, 1C, 1D Disposable diapers (absorbent articles)
F ventral side M crotch R back side 2 surface sheet 21 first region 22 second region 23L, 23S convex portion 24 concave portion 25 opening 25E extending portion 3 back sheet 4 absorbent 5 side sheet 6 fastening member 7 Fastening area 71 First display area corresponding area 72 Second display area corresponding area 73 Third display area corresponding area X Vertical direction Y Horizontal direction

Claims (8)

It has a longitudinal direction corresponding to the wearer's front-rear direction and a transverse direction orthogonal thereto, and comprises an absorbent body and a surface sheet disposed closer to the wearer's skin than the absorbent body, An absorptive article having in the vertical direction an abdominal side portion arranged on the ventral side and a back side portion arranged on the back side and a crotch portion located therebetween,
The top sheet is divided into a first region and a second region having different physical properties on at least one of the lateral sides of the boundary, with a lateral center line that bisects the absorbent article in the lateral direction and extends in the longitudinal direction as a boundary. Two regions,
Fastening members are provided on both side edges along the longitudinal direction of the back side portion, and a fastening region where the fastening member can fasten to the non-skin facing surface of the ventral side portion is the lateral center. It is provided so as to cross the line,
In the fastening region, a plurality of display portions indicating the fastening positions of the fastening members are provided so as to be recognizable from the outside, and the plurality of display portions includes a first display portion straddling the horizontal center line, A second display section adjacent to the laterally outward side of the first display section,
The first display portion corresponding area includes both the first display section and the virtual extension area when the first display section is virtually extended in the vertical direction, and the first area of the topsheet exists.
The absorptivity in which the second region of the topsheet is present in the second display portion corresponding region, including both the second display portion and the virtual extension region when the second display portion is virtually extended in the vertical direction. Goods. The absorbent article according to claim 1, wherein the physical property is at least one selected from the group consisting of the following (1) to (3).
(1) Height of the convex part when the plurality of convex parts projecting toward the wearer's skin side are formed on the skin facing surface of the top sheet (2) Bending rigidity of the top sheet (3) MMD value of the skin facing surface of the topsheet   The absorptive article according to claim 1 or 2 in which the 1st field of said surface sheet does not exist in said 2nd indicator corresponding field.   The absorptive article according to claim 1 or 2 with which the 1st field of said surface sheet has extended from said 1st display part corresponding field to said 2nd display part corresponding field.   The absorptive article according to any one of claims 1 to 4 with which the 2nd field of said surface sheet has extended from said 2nd display part corresponding field to said 1st display part corresponding field.   The absorptive article according to any one of claims 1 to 5 with which the 2nd field of said surface sheet is prolonged in the opposite side to said 1st display part corresponding field from said 2nd display part corresponding field. . A third display portion is provided on the outer side in the lateral direction of the second display portion in the fastening area so as to be recognized from the outside.
The first display area and the second area of the topsheet are included in a third display section corresponding area including both the third display section and a virtual extension area when the third display section is virtually extended in the vertical direction. Absorbent article given in any 1 paragraph of Claims 1-6 which do not exist.   The absorbent article according to any one of claims 1 to 7, wherein the topsheet has a third region having a physical property different from that of the second region outside the second region in the lateral direction.

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