TWI710366B - Absorbent articles - Google Patents

Abstract

The surface sheet (2) of the present invention includes a laminate of a first sheet and a second sheet. The laminated body has a plurality of joints caused by the partial joining of the first sheet and the second sheet, and the first sheet protrudes away from the second sheet at a location other than the joints, forming a person facing the wearer The protruding parts of the body. The front sheet (2) has a central area (S) and a pair of side areas (M) adjacent to the central area (S). The shape and/or arrangement pattern of the joining part is different in the central area (S) and the side area (M). The area ratio of the junction is approximately the same in the central area (S) and the side area (M). The number of junctions per unit area is that the side area (M) is more than the central area (S).

Description

Absorbent articles

The present invention relates to various absorbent articles such as disposable diapers or menstrual sanitary napkins.

The following technology is known, which aims to reduce the contact area or friction between the front sheet and the wearer's skin, or to improve the texture or breathability while wearing the absorbent article, and the skin in the front sheet The opposite side is made into a three-dimensional shape. For example, Patent Document 1 describes a front sheet 2 of an absorbent article 1, which has a plurality of protrusions 21 having a shape longer in the longitudinal direction in a central region 2c located at the center of the longitudinal direction, and The end regions 2a and 2b located in front of and behind the central region 2c have a plurality of convex portions 22 that are long in the width direction of the absorbent article. The convex parts 21 and 22 in the central region 2c and the end regions 2a and 2b are arranged in a state of being dispersed in the longitudinal direction and the width direction of the absorbent article 1. The front sheet 2 includes: a first non-woven fabric 23 formed with convex portions 21 and 22; and a substantially flat second non-woven fabric 24, which is part of the first non-woven fabric 23 other than the convex portions 21 and 22 and the first non-woven fabric 23 Splice. This document describes that the absorbent article 1 having such a top sheet 2 has excellent absorption performance and also excellent anti-leakage performance. Patent Document 2 describes a front sheet 2 of an absorbent article 1 in which a plurality of convex portions 21 are formed in a central region 2a arranged at a central portion extending in the longitudinal direction in a state dispersed in the longitudinal direction and the width direction , And in the side regions 2b, 2b arranged on the left and right sides of the central region 2a, a plurality of convex portions rows R1 to R3 formed by a plurality of convex portions 22 serially arranged in the longitudinal direction are formed in the width direction. The front sheet 2 includes: a first non-woven fabric 22 that is shaped into a concave and convex shape; and a substantially flat second non-woven fabric 23 that is joined to the first non-woven fabric 22 in the whole or a part of the concave portion 22 a of the first non-woven fabric 22. The document describes that the absorbent article 1 having such a front sheet 2 has excellent leakage prevention performance, and can effectively prevent both side leakage and leakage from the front and rear ends. Prior Art Documents Patent Documents Patent Document 1: Japanese Patent Laid-Open No. 2009-136349 Patent Document 2: Japanese Patent Laid-Open No. 2009-148445

In order to improve the softness of the front sheet of the laminated laminate containing two non-woven fabrics as described in Patent Documents 1 and 2, or to reduce friction with the wearer’s skin, it is more effective to combine the area ratio of the two non-woven fabrics Set to low. However, the decrease in the bonding area ratio will lead to a decrease in the bonding strength of the two non-woven fabrics in most cases. The decrease in bonding strength may cause peeling of the two non-woven fabrics or bulging between the two non-woven fabrics in the wearing of the absorbent article. Especially in the vicinity of the leg openings, which are areas where the degree of contact with the wearer's skin is relatively high, the above-mentioned peeling or bulging is more likely to occur. [Technical Means to Solve the Problem] The present invention provides an absorbent article comprising a front sheet, a back sheet, and an absorber arranged between the two sheets, the front sheet includes a first sheet and a second sheet. A laminated body of 2 sheets, the laminated body has a plurality of joints caused by the partial joining of the first sheet and the second sheet, and the first sheet is away from the second sheet at a location other than the joint The front surface sheet has a central area located at the center in the width direction and extending in the longitudinal direction, and adjacent to the central area and extending in the longitudinal direction. A pair of side regions, the shape and/or arrangement pattern of the above-mentioned joint is different in the central region and the side region, the area ratio of the above-mentioned joint is approximately the same in the central and side regions, and the ratio of the above-mentioned joint per unit area The number system has more lateral areas than central areas.

The present invention relates to the improvement of the front sheet of an absorbent article comprising a laminate of two sheets, and more specifically, it relates to a front sheet that has a good texture and is not prone to peeling or swelling between the two sheets Sheet of absorbent articles. Hereinafter, the absorbent article of the present invention will be described based on its preferred embodiment with reference to the drawings. Fig. 1 and Fig. 2 show a disposable diaper 1 which is one embodiment of the absorbent article of the present invention. The diaper 1 has an abdominal part 1F arranged on the abdominal side of the wearer when worn, a dorsal part 1R arranged on the back side, and a lower crotch 1M between them. The diaper 1 has the longitudinal direction X which extends from the abdominal part 1F to the back part 1R via the crotch part 1M, and corresponds to the front and back direction of the wearer, and the width direction Y orthogonal to it. The abdominal part 1F, the crotch part 1M, and the back part 1R correspond to each area when the diaper 1 is divided into three equal parts in the longitudinal direction X. The crotch portion 1M has an excretion opposing portion arranged opposite to the excretion of the wearer when the diaper 1 is worn. The excretion opposing portion is usually located at or near the center of the longitudinal X of the diaper 1.

As shown in Figures 1 and 2, the diaper 1 includes: an absorbent body 4 having an absorbent core 40; a liquid-permeable front sheet 2 arranged on the skin-facing side of the absorbent body 4, and When wearing, it can be in contact with the wearer's skin; and the liquid-impermeable or water-repellent back sheet 3 is arranged on the non-skin facing side of the absorbent body 4. In the plan view as shown in FIG. 1, the diaper 1 is formed in a longitudinally long hourglass shape that is located in the lower part 1M of the crotch and is contracted inward in the longitudinal direction X and is longer in one direction, that is, the longitudinal direction X. The front sheet 2 has approximately the same size as the absorber 4 or has a size slightly larger than the absorber 4. The back sheet 3 has a size larger than that of the absorber 4. In addition, the back sheet 3 has a larger size than the front sheet 2. The back sheet 3 extends outward from the periphery of the absorbent body 4 to form the outer shape of the diaper 1 in an unfolded and stretched state as shown in FIG. 1. As the back sheet 3, various sheets previously used for such absorbent articles can be used without particular limitation, and a resin film, a laminate sheet of a resin film, a non-woven fabric, etc. can be used. The back sheet 3 may have air permeability.

In this specification, the "skin facing surface" refers to the surface of the absorbent article or its constituent members (such as absorber 4) that faces the wearer's skin when wearing the absorbent article, that is, relatively speaking away from the wearer's skin The closer side. The "non-skin facing surface" refers to the surface of the absorbent article or its constituent members that faces the side opposite to the skin side when the absorbent article is worn, that is, the side facing the side relatively far from the wearer's skin. The "wearing time" mentioned here refers to the state of maintaining the usual proper wearing position, that is, the correct wearing position of the absorbent article, and does not include the state of the absorbent article deviating from the wearing position. Side sheets 5 are respectively arranged on the left and right sides along the longitudinal direction X on the side of the front sheet 2 of the diaper 1. The side sheet 5 has an inner edge portion along the longitudinal direction X and a lateral edge portion located on the outer side of the lateral direction Y than the inner edge portion and along the longitudinal direction X. In the plan view shown in FIG. 1, the inner side The edge overlaps the absorber 4, and as shown in FIG. Between the side sheet 5 and the back sheet 3 of the left and right legs arranged around the leg of the wearer, the linear elastic member 50 is fixed in an extended state along the longitudinal direction X. Thereby, when the diaper 1 is worn on the legs, a pair of leg gathers are formed by the contraction of the elastic member 50. In addition, at the inner edge of the side sheet 5, the linear elastic member 51 is fixed in an extended state along the longitudinal direction X, whereby when the diaper 1 is worn, the elastic member 51 shrinks at least in the lower part of the crotch. 1M, the side sheet 5 starts from the junction with the back sheet 3, and the inner edge side rises toward the wearer's skin side to form a leak-proof cuff. The leak-proof cuffs can prevent the outflow of excretion fluid such as urine to the outside of the lateral direction Y, so-called side leakage. The top sheet 2, the back sheet 3, the absorber 4, the side sheets 5, and the elastic members 50 and 51 are joined to each other by a well-known joining method such as a hot-melt adhesive. The diaper 1 is a so-called expandable disposable diaper. As shown in Fig. 1, a pair of hook and loop fasteners 6, 6 are provided at the edge portions of both sides along the longitudinal direction X of the back side portion 1R of the diaper 1. The hook and loop fastener 6 is equipped with a fixing portion (not shown) of a male member including a mechanical surface fastener. In addition, on the non-skin facing surface of the ventral portion 1F of the diaper 1, a fixed region 7 of a mother member including a mechanical surface fastener is formed. The fixed area 7 uses a known joining method, such as an adhesive or heat sealing, to join and fix the mother member of the mechanical surface fastener to the non-skin of the back sheet 3 forming the non-skin facing surface of the ventral portion 1F The facing surface is formed so that the fixing part of the hook and loop fastener 6 can be detachably fixed. In the plan view as shown in FIG. 1, the absorbent body 4 is formed into a shape long in the longitudinal direction X, and extends from the abdominal part 1F to the back part 1R. The absorber 4 includes a liquid-retaining absorbent core 40 containing an absorbent material, and a core-clad material 45 covering the skin-facing surface 40a and the non-skin-facing surface 40b of the absorbent core 40. The absorptive core 40 and the core covering material 45 are joined by a well-known joining means such as a hot-melt adhesive. The absorber 4 (absorbent core 40) is formed symmetrically with respect to an imaginary straight line (not shown) that divides the diaper 1 into two parts in the transverse direction Y and extends in the longitudinal direction X. The absorbent core 40 may have a single-layer structure. Alternatively, the absorbent core 40 may have a multilayer structure. In the plan view as shown in FIG. 1, the absorbent core 40 is formed in the shape of an hourglass in which the longitudinal direction, that is, the center portion of the longitudinal direction X shrinks inward. The absorbent core 40 is formed by fiber stacking a core forming material containing an absorbent material. As the absorbent material, it can be used without particular limitation as a material for forming such an absorbent core and ordinary users, for example, include: wood pulp, hydrophilic fibers such as synthetic fibers treated with a hydrophilizing agent, or water absorption Polymer particles. That is, the absorbent core 40 may be a fiber accumulation of hydrophilic fibers or a fiber accumulation that supports water-absorbent polymer particles. As the chip covering material 45, a water-permeable sheet can be used. As the core-coating material 45, for example, paper, non-woven fabric, etc. can be used. In the diaper 1 of the present embodiment, the core-covering material 45 is a continuous core-covering material 45 having a width of two to three times the length of the transverse direction Y of the absorbent core 40, as shown in FIG. 2, The one sheet of core-wrap material 45 covers the entire area of the skin-facing surface 40a of the absorbent core 40, and extends from both sides of the absorbent core 40 along the longitudinal direction X to the outer side of the transverse direction Y. The exit portion is rolled down to below the absorbent core 40, and covers the entire area of the non-skin facing surface 40b of the absorbent core 40. However, the form of the core covering material 45 is not limited to this. For example, it may include a skin-side core covering material covering the skin facing surface 40a of the absorbent core 40, and a non-skin covering material covering the absorbent core 40. The non-skin side core-coated material covered with the facing surface 40b, and the two sheets are independent individual sheets. As shown in FIG. 3, the front sheet 2 arranged on the side of the skin facing surface 40a in the absorber 4 has a central area S and a pair of side areas M and M located on both sides of the central area S. The central area S is located in the central part of the width direction of the diaper 1 (ie, the transverse direction Y), and extends along the length direction of the diaper 1 (ie, the longitudinal direction X). A pair of side regions M and M are adjacent to the central region S and extend along the length direction of the diaper 1 (ie, the longitudinal direction X). The central area S and the side area M are preferably formed at least at the lower part of the crotch 1M, and more preferably formed from the lower part of the crotch 1M to either or both of the ventral part 1F and the dorsal part 1R, more preferably It is formed over the entire length of the absorbent body 4, and more preferably formed over the entire length of the diaper 1. The central area S and the side area M can be distinguished according to the shape and/or arrangement pattern of the joint described below. The width of the central region S relative to the width of the front sheet 2 is preferably 30% or more, and more preferably 40% or more. Moreover, it is preferably 70% or less, and more preferably 60% or less. Furthermore, the width of the central region S is preferably 30% or more and 70% or less, and more preferably 40% or more and 60% or less with respect to the width of the surface sheet 2. The width of the side region M relative to the width of the front sheet 2 is preferably 15% or more, and more preferably 20% or more. Moreover, it is preferably 35% or less, and more preferably 30% or less. Furthermore, the width of the side region M with respect to the width of the surface sheet 2 is preferably 15% or more and 35% or less, and more preferably 20% or more and 30% or less. On the other hand, the sum of the widths of the side regions M relative to the width of the front sheet 2 is preferably 30% or more, and more preferably 40% or more. Moreover, it is preferably 70% or less, and more preferably 60% or less. Furthermore, the sum of the widths of the side regions M with respect to the width of the front sheet 2 is preferably 30% or more and 70% or less, and more preferably 40% or more and 60% or less. The surface sheet 2 includes a laminate of a first sheet and a second sheet. The first sheet is located on the side of the wearer's body while wearing the diaper 1. The second sheet is located on the absorber 4 side. As shown in FIG. 4, which is an enlarged view of the main part of FIG. 3, the front sheet 2 in any one of the central area S and the side area M is a layered first sheet and a second sheet. Partially joined by embossing or ultrasonic processing, a plurality of joints M11, M12, S11, S12 are formed, and the first sheet is located away from the first sheet at a location other than the joints M11, M12, S11, S12 The direction of the two sheets protrudes, and convex parts M21, S21, S22 protruding toward the wearer's skin side are formed. The front sheet 2 has a substantially flat surface on the second sheet side in any of the central region S and the side regions M, and has large undulations on the first sheet side. In the central region S of the surface sheet 2, two types of junction parts S11 and S12 are formed. The joint portions S11 and S12 are identical in terms of having a rectangle with sides along the longitudinal direction X and the lateral direction Y, but have different shapes. The joint portions S11 are arranged in a row along the longitudinal direction X with a certain distance apart to form a first joint portion row S31. The joint portions S12 are also arranged in a row along the longitudinal direction X with a certain distance apart, thereby forming a second joint portion row S32 and a third joint portion row S33. Between adjacent first joining portion rows S31, second joining portion rows S32 and third joining portion rows S33 are alternately arranged. The second joint portion row S32 and the third joint portion row S33 have the same distance between the joint portions S12 along the longitudinal direction X, and the phases are shifted by half a pitch. By arranging the joint portions S11 and S12 in this way, the convex portions S21 and S22 are formed in the central region S. The convex portion S21 has a plan view shape of a substantially elliptical shape whose length along the transverse direction Y is longer than that along the longitudinal direction X. The convex portion S22 has a substantially circular top view shape whose length along the lateral Y and longitudinal X are substantially the same. When the front sheet 2 is viewed along the longitudinal direction X, the central region S is formed with a first protrusion row S34 in which the protrusions S21 and the protrusions S22 are alternately arranged along the longitudinal direction X. The first convex portion row S34 is located at the same position as the second engaging portion row S32 described above. In addition, when the surface sheet 2 is viewed along the longitudinal direction X, a second convex portion row S35 in which only the convex portion S22 is arranged along the longitudinal direction X is formed in the central region S. The second convex portion row S35 is located at the same position as the third joint portion row S33 described above. "Roughly elliptical" refers to the concept of complete ellipse and oblong. "A substantially circular shape whose length along the transverse direction Y is approximately the same as the length along the longitudinal direction X" includes both of the following: a complete circle, and the length along the longitudinal direction X is within ±10% of the length along the transverse direction Y The elliptical shape when the situation is within the range. In the side area M of the surface sheet 2, two types of junction parts M11 and M12 are formed. The joint portions M11 and M12 are identical in terms of having a rectangle with sides along the longitudinal direction X and the lateral direction Y, but have different shapes. The joints M11 are arranged in a row along the longitudinal direction X with a certain distance apart to form a fourth joint row M31. The joints M12 are also arranged in a row along the longitudinal direction X with a certain distance apart, thereby forming a fifth joint row M32. The fourth joint portion row M31 and the fifth joint portion row M32 are alternately arranged in the lateral direction Y. The distance between the joints M11 in the fourth joint row M31 and the distance between the joints M12 in the fifth joint row M32 are the same. In addition, in the fourth joining portion row M31 and the fifth joining portion row M32, the arrangement of the joining portions M11 and M12 is shifted by a half pitch. As a result, in the side region M, only one type of convex portion, that is, convex portion M21 is formed. The convex portion M21 is formed in an area surrounded by a total of four joint portions of two joint portions M11 adjacent in the longitudinal direction X and two joint portions M12 adjacent in the lateral direction Y. The convex portion M21 has a substantially circular plan view shape with a length along the lateral Y and a length along the longitudinal X being substantially the same. When the front sheet 2 is viewed along the lateral direction Y, in the side area M, a third convex portion row M33 and a fourth convex portion row M34 in which the convex portions M21 are arranged along the lateral direction Y are formed. In the third convex portion row M33 and the fourth convex portion row M34, the distance between the convex portions M21 is the same, and the arrangement of the convex portions M21 is staggered by a half pitch. Regarding the convex portion S21 and the convex portion S22 formed in the central region S, the heights may be the same or different, but from the viewpoint of improving the appearance and touch, they are preferably different in height. When the heights of the two convex portions S21 and S22 are different, the convex portion S21 may be higher than the convex portion S22, or conversely, the convex portion S22 may be higher than the convex portion S21. By setting the two types of protrusions to different heights, when touching the part with a finger, the parts with different tactility will appear alternately, which is better than the one with the same height. The texture. In addition, when the excreted urine flows along the surface of the front sheet 2, the resistance when the urine moves from the lower convex portion to the higher convex portion becomes greater, whereby the urine becomes difficult to flow, which can reduce leakage. Regarding the convex portion M21 formed in the side region M, the height of the convex portion M21 may be the same as the convex portion S21 and the convex portion S22, or may be different. For example, the height of the convex part M21 may be the same as any of the convex part S21 and the convex part S22, or may be the same as both of the convex part S21 and the convex part S22, or it may be different from both. The side area M is prone to bulge of the front sheet 2 due to the movement of the wearer's legs. Therefore, from the viewpoint of suppressing the swelling of the surface sheet 2, the convex portion M21 arranged in the side area M is preferably composed of one type of convex portion. Furthermore, it is preferable that the height of the convex part M21 arranged in the side area M is lower than the height of the convex parts S21 and S22 arranged in the central area S where texture is more important, or the height of the two is the same. In the surface sheet 2, the shape and/or arrangement pattern of the joint portions S11, S12, M11, and M12 are different in the central area S and the side area M. That is, at least any one of the shape or the arrangement pattern of the joint portions S11, S12, M11, and M12 is different in the central area S and the side area M. In detail, in the central area S and the side area M, it is any one of the following situations: (i) the layout pattern of the joint is the same, but the shape of the joint is different; or (ii) the shape of the joint is the same, However, the layout pattern of the joint is different; or (iii) the layout pattern of the joint is different, and the shape of the joint is also different. Due to the difference between the central area S and the side area M, the contact between the front sheet 2 and the wearer's skin can be appropriately controlled, and the appearance can also be greatly changed, but it is preferable that the shape and arrangement pattern of the joint are different . In the embodiment shown in FIGS. 3 and 4, in the central area S and the side area M, the layout patterns of the joint portions S11, S12, M11, and M12 are different, and the shapes of the joint portions S11, S12, M11, and M12 are also different. different. In the front sheet 2, in the central area S and the side area M, the shape and/or the arrangement pattern of the joining portion are different. In addition, the area ratio of the joining portion is approximately the same in the central area S and the side area M. The area ratio (%) of the joint part is the sum of the area of the joint part occupied in a specific area in each of the central area S and the side area M, divided by the specific area and then multiplied by 100 value. The area ratio of the junction is substantially the same, including the following two: the area ratio of the junction is the same in the central area S and the side area M, and the area ratio of the side area M is ±15% relative to the area ratio of the central area S Circumstances within the scope. That is, when the area ratio of the central region S is A% and the area ratio of the side region M is 0.85A% or more and 1.15A% or less, it is said that the area ratio of the central region S and the side region M are approximately the same . Since the area ratio of the joint is approximately the same in the central area S and the side area M, the advantage is that, when the diaper 1 is worn, the first sheet and the second sheet constituting the front sheet 2 change It is not easy to peel off. In addition, there are advantages in that the pressure fluctuation when the roll rotates when the front sheet 2 is manufactured by laminating the first sheet and the second sheet, and the width of the roll can be lined The pressing on the central area S and the side area M are substantially the same, thereby significantly improving the workability. For example, it becomes difficult to generate voids in the bonding of the first sheet and the second sheet. In addition, it is possible to suppress abrasion or chipping of the roller used for bonding. In addition, since the area ratio of the joint is approximately the same in the central area S and the side area M, an important advantage for the absorbent article can be obtained, that is, the excreted urine can be uniformly absorbed by the entire surface of the absorber. In this embodiment, when the laminated first sheet and second sheet are locally joined by embossing or ultrasonic processing to form a plurality of joints M11, M12, S11, S12, the joints In this, the fibers of the non-woven fabric constituting the first sheet and the second sheet are filmed to prevent peeling and swelling during use, so that urine is not absorbed in the joint. Since urine is excreted to the central area S at a rate of 3 cc/sec or more and 20 cc/sec or less under normal use, it cannot be completely absorbed by the central area S alone. Therefore, it is important not only in the central area S, but also in the central area S. The side area M is also absorbed instantaneously. If the area ratios of the junctions existing in the central region S and the side regions M are different, the absorption speed of excreted urine in each part will vary. Due to this situation, it is difficult to uniformly and efficiently use The entire surface of the absorber becomes prone to leakage. In the present invention, since the area of the joint portion of the part is the same, it is possible to prevent such a problem. In addition, by uniformly and efficiently using the entire surface of the absorber, free water (water not held by the water-absorbent polymer particles) inside the diaper is reduced, and it is also possible to prevent the moisture from returning to the skin during wearing of the diaper. On the condition that the area ratio of the junction is substantially the same in the central region S and the side region M, the area ratio of the junction in the central region S and the side region M is preferably 10% or more, and more preferably 15% or more. In addition, the area ratio of the junction is preferably 40% or less, and more preferably 35% or less. The area ratio of the junction is preferably 10% or more and 40% or less, and more preferably 15% or more and 35% or less. By setting the area ratio to this range, it is possible to sufficiently improve the bonding strength of the two sheets without reducing the skin touch and absorption performance of the front sheet 2. In the front sheet 2, the shape and/or arrangement pattern of the joints in the central area S and the side area M are different. In addition, the number of joints per unit area is more in the side area M than in the central area S. Setting the number of joints in the side region M to be more than that in the central region S has the following advantages (a) and (b). (a) The degree of freedom of the constituent fibers of the surface sheet 2, that is, the ease of movement of the fibers is that the central region S is higher than the side region M. As a result, the softness of the central region S is improved. (b) The height difference between the convex portion and the concave portion in the side region M becomes relatively low, and the degree of freedom of the fiber decreases. As a result, it becomes less prone to breakage of the front sheet 2 in the side area caused by the movement of the wearer's legs. In addition, by setting the number of joints in each side region M to be more than that in the center region S, there is also an advantage that the vibration at both sides of the roll during manufacturing is reduced, thereby significantly improving workability. For example, it becomes difficult to generate voids in the bonding of the first sheet and the second sheet. In addition, it is possible to suppress abrasion or chipping of the roller used for bonding. In the surface sheet 2, the area of the largest area of the junctions S11 and S12 formed in the central region S is set to C, and the largest area of the junctions M11, M12 formed in the side region M When the area is set to D, it preferably has a relationship of C>D. By making the area of the junction formed in the central region S larger than the area of the junction formed in the side region M, it becomes easy to make the number of junctions formed in the central region S less than that formed in the side region M The number of joints. As a result, when the diaper 1 is worn, irregular wrinkles are not easily generated in the central region S. If irregular creases are generated, urine or feces become easy to flow along the creases, and sometimes leakage may easily occur due to this condition. In contrast, by suppressing the generation of wrinkles, liquid leakage can be suppressed. From the viewpoint of further suppressing the occurrence of wrinkles, the area D is preferably 80% or less of the area C, and more preferably 70% or less. In addition, the area D is preferably 20% or more of the area C, and more preferably 30% or more. The area D is preferably 20% or more and 80% or less of the area C, and more preferably 30% or more and 70% or less. The ratio of the total area of the joints of the area C to the total area of the joints of the central region S is preferably 20% or more, and more preferably 30% or more. The upper limit of the ratio is preferably 80%, and more preferably 70%. On the other hand, the ratio of the sum of the areas of the joints of the area D to the sum of the areas of the joints of the side region M is preferably 80% or more, and more preferably 90% or more. The upper limit of the ratio is preferably 100%. In the front sheet 2, the length of the longest length along the longitudinal direction X among the joint portions S11 and S12 formed in the central area S is set to E, and the joint portions M11 and M12 formed in the side area M When the length of the longest length in the longitudinal direction is set to F, it preferably has a relationship of E>F. Thereby, in the state of wearing the diaper 1, when the central area S receives a laterally inward force from the wearer's thigh, when the central area S is wrinkled, the wrinkles are easily generated regularly. In other words, it becomes difficult to produce irregular wrinkles in the central area S. Due to this situation, liquid leakage is suppressed. From the viewpoint of making wrinkles more regular, the length F is preferably 80% or less of the length E, and more preferably 70% or less. Furthermore, the length F is preferably 20% or more of the length E, and more preferably 30% or more. The length F is preferably 20% or more and 80% or less of the length E, and more preferably 30% or more and 70% or less. The ratio of the sum of the areas of the junctions of the central region S and the length E to the sum of the areas of the junctions is preferably 20% or more, and more preferably 30% or more. The upper limit of the ratio is preferably 100%, and more preferably 80%. On the other hand, the ratio of the sum of the areas of the joints of the length F in the side region M to the sum of the areas of the joints is preferably 60% or more, and more preferably 80% or more. The upper limit of the ratio is preferably 100%, and more preferably 90%. In the front sheet 2, it is preferable that the shear stress of the sheet 2 in the side area M is higher than the shear stress of the sheet 2 in the central area S. The shear stress is an indicator of the softness of the convex portions formed in the central region S and the side regions M, which means that the smaller the shear stress, the softer the convex portions. Therefore, the higher shear stress in the side region M than the shear stress in the central region S means that the convex portion of the central region S is softer than the side region. Thereby, the convex part of the center area S which is the most dominant area|region for softness can be made soft, and the wearing feeling of the diaper 1 can be improved. The shear stress is measured by the following method. A rectangular shape with a vertical length of 50 mm and a horizontal length of 30 mm was cut from the front sheet of the object to be measured and used as a test piece. Next, a tape (manufactured by Nitto Denko Co., Ltd., trade name "No. 500") with the same shape and size as the test piece was superimposed on a PET (Polyethylene Terephthalate) film (STAR CORPORATION) , Trade name "Star OHP Film") to make a laminate (A), overlay the non-convex side of the test piece on the tape side of the laminate (A) to obtain a laminate (B), and make 1 kg The roller goes back and forth on the laminate (B) 5 times, and the adhesive tape in the laminate (B) is pressed against the test piece. Also, prepare the male member (manufactured by 3M (stock), trade name "1600PPI") of the mechanical fastener of the shape and size that can cover the entire test piece as the adhered piece, and make the test piece on the laminate (B) The convex part side is crimped with a 1.5 kPa load through the bristle material on the adhered sheet to obtain a measurement sample. The measurement sample was installed between the chucks of a tensile tester (Autograph AG-X manufactured by Shimadzu Corporation) (the distance between the chucks was 150 mm), and the measurement sample was peeled at 180 degrees. The 180-degree peeling is performed by clamping the laminated body (B) at one end of the longitudinal direction of the measurement sample and the adhered sheet at the other end in the chuck of the tensile testing machine, and facing the opposite direction of 180 degrees. Stretch. The tensile speed is set to 300 mm/min, and the maximum tensile load at this time is recorded. The measurement parts are selected from one piece of diaper, including the length direction of the diaper, the abdomen, the back side × the short dimension direction of the diaper, the left, right, and the center of the diaper. The measurement is performed on a total of 3 diapers, and the average value is obtained. Shear stress (unit: N) of the front sheet as the measurement object. The value of the shear stress in the central region S is preferably 25 N or more, and more preferably 30 N or more. Furthermore, it is preferably 34 N or less, and more preferably 33 N or less. The value of the shear stress of the central region S is preferably 25 N or more and 34 N or less, and more preferably 30 N or more and 33 N or less. On the other hand, the value of the shear stress in the side region M is higher than the shear stress in the central region S, and is preferably 33 N or more, and more preferably 35 N or more. Furthermore, it is preferably 45 N or less, and more preferably 40 N or less. The value of the shear stress of the side region M is preferably 33 N or more and 45 N or less, and more preferably 35 N or more and 40 N or less. In order to make the value of the shear stress different between the central area S and the side area M, for example, the joint pattern of the central area S and the side area M may be different, or the strength of each joint may be different. . For example, convex parts S21 and S22 are present in the central region S, and convex parts M21 are present in the side region M (see FIG. 4). At this time, the area of the largest convex portion in the central region S (in FIG. 4, the convex portion S21) is set to S _max , and the largest convex portion in the side region M (the convex portion When the area of M21) is set to M _max, it is important to satisfy the relationship of S _max > M _max . By satisfying this relationship, compared with the side regions M, the degree of freedom of fibers (easy to move) of the central region S becomes relatively larger, and the softness becomes more remarkable. The front sheet 2 configured as described above can be manufactured according to, for example, the method for manufacturing a composite sheet described in Japanese Patent Application Laid-Open No. 2015-112343. Specifically, for example, it is obtained by a method of supplying a belt-shaped first sheet between a first roller and a second roller whose peripheral surfaces are mutually meshing, and deforming the first sheet into unevenness After the shape, the first sheet is moved from the meshing part along the peripheral surface of the first roller, and the second sheet is fed so as to overlap the first sheet, and the two sheets are placed in the first roller. The convex part and the heating roller are heated while being pressed to join them locally. At this time, the concave and convex shapes of the first roller and the second roller, and the joint formed by the first roller and the heating roller The pattern is different on the center and side of the first sheet. When the first sheet is meshed with the meshing portion of the first roller and the second roller to deform into a concavo-convex shape, it is preferable to attract the first sheet toward the inside of the roller to promote the deformation of the first sheet into the concavo-convex shape. The first sheet and the second sheet constituting the top sheet 2 are made of sheet materials. As the sheet material, for example, fiber sheets such as nonwoven fabrics, woven fabrics, and knitted fabrics, or films, etc. can be used. From the viewpoint of skin touch, etc., it is preferable to use a fiber sheet, and it is particularly preferable to use a non-woven fabric. The types of the sheet materials constituting the first sheet and the second sheet may be the same or different, but from the viewpoint of obtaining strong sealing strength, the same type of sheet is preferable. When a non-woven fabric is used as the sheet material constituting the first sheet and the second sheet, examples of the non-woven fabric include: hot-air non-woven fabric, spun-bonded non-woven fabric, spunlace non-woven fabric, melt-blown non-woven fabric, and resin adhesive non-woven fabric , Needle punched non-woven fabrics, etc. A laminate obtained by combining two or more kinds of these nonwoven fabrics, or a laminate obtained by combining these nonwoven fabrics with a film or the like can also be used. Among them, it is preferable to use hot-air nonwoven fabric or spunbonded nonwoven fabric. Particularly preferably, the first sheet, which is the sheet on the side opposite to the wearer's skin in the state of wearing the diaper 1, contains a hot-air nonwoven fabric. The basis weight of the non-woven fabric used as the sheet material constituting the first sheet and the second sheet is each independently preferably 10 g/m ² or more, more preferably 15 g/m ² or more, and more preferably 40 g/m ² or less, more preferably 35 g/m ² or less. The basis weight of the non-woven fabric is preferably 10 g/m ² or more and 40 g/m ² or less, and more preferably 15 g/m ² or more and 35 g/m ² or less. As the fibers constituting the nonwoven fabric, various fibers containing thermoplastic resins can be used. Examples of thermoplastic resins include polyolefins such as polyethylene or polypropylene, polyesters such as polyethylene terephthalate, polyamides such as nylon 6 or nylon 66, polyacrylic acid, polyalkyl methacrylate, and poly Vinyl chloride, polyvinylidene chloride, etc. These resins can be used individually by 1 type or as a blend of 2 or more types. Also, it can be used in the form of composite fibers such as a core-sheath type or a side-by-side type. It is particularly preferable that the first sheet, which is the sheet on the side opposite to the wearer's skin in the state of wearing the diaper 1, contains a plurality of types of fibers. Especially when the first sheet has an upper and lower double layer structure, it is preferable that any one of the upper layer and the lower layer contains a plurality of fibers. Thereby, the cushioning feeling generated by the convex portion is higher, and the smoothness of the convex portion is improved. Furthermore, the standing property of the convex part or the resistance to collapse of the convex part when a load is applied are improved. The above-mentioned plural kinds of fibers preferably include at least two kinds of fibers including a first fiber and a second fiber. In addition, it is preferable that the first fiber and the second fiber each contain a high-melting component and a low-melting component whose melting point is lower than the high-melting component. In this case, the high melting point component of the first fiber and the high melting point component of the second fiber may be of the same type, or may be of different types. In addition, the low melting point component of the first fiber and the low melting point component of the second fiber may be of the same type, or may be of different types. The first fiber and the second fiber are preferably distinguished by the difference in diameter ratio. In this specification, the diameter ratio is the ratio of the diameter of the high melting point component to the diameter (μm) of the low melting point component of the first fiber and the second fiber. The diameter of the high-melting component and the diameter of the low-melting component refer to: for example, when the first and second fibers are core-sheath composite fibers, and the sheath resin contains low-melting components, the core resin contains high-melting components, as shown in Figure 5. D1 is the diameter of the low melting point component C1, and D2 is the diameter of the high melting point component C2. In addition, the diameter ratio AX of the high melting point component C2 and the low melting point component C1 of the Xth fiber is calculated by the following formula. Here, "the same type of hot-melt fiber" refers to the same resin constituting the fiber and the same structure. For example, when there are two core-sheath composite fibers containing a high-melting component and a low-melting component, the high-melting component and low-melting component of the two fibers are respectively the same resin, and the core-sheath diameter ratio When the same, the two fibers are the same type of hot-melt fiber. On the other hand, even if the high melting point component and the low melting point component are the same resin, they are different types of hot-melt fibers when the diameter ratio is different. In addition, "comprising plural kinds of fibers" means including different kinds of hot-melt fibers. X-th fiber diameter ratio AX = X-th fiber's low-melting-point component diameter D1 (μm) ÷ X-th fiber's high-melting-point component diameter D2 (μm) In the present invention, as described above, it is preferable to make the first fiber The diameter ratio A1 is different from the diameter ratio A2 of the second fiber. The ratio of A2 to A1, that is, the value of A2/A1 is preferably less than 1, more preferably 0.99 or less, and more preferably 0.91 or less. Moreover, the value of A2/A1 is preferably 0.5 or more, more preferably 0.6 or more, and more preferably 0.7 or more. By setting the ratio of A1 to A2 in this way, the cushioning feeling generated by the convex portion is further improved, and the smoothness of the convex portion is further improved. Furthermore, the standing property of the convex portion or the resistance to collapse of the convex portion when a load is applied is further improved. For example, the value of A2/A1 is preferably 0.5 or more and less than 1, more preferably 0.6 or more and 0.99 or less, and more preferably 0.7 or more and 0.91 or less. When the ratio of the first fiber diameter ratio A1 to the second fiber diameter ratio A2 is as described above, the first fiber diameter ratio A1 itself is preferably 1.1 or more, more preferably 1.2 or more, more preferably 1.3 and above. Furthermore, it is preferably 2.0 or less, more preferably 1.9 or less, and more preferably 1.8 or less. Specifically, the first fiber diameter ratio A1 itself is preferably 1.1 or more and 2.0 or less, more preferably 1.2 or more and 1.9 or less, and more preferably 1.3 or more and 1.8 or less. On the other hand, the diameter ratio A2 of the second fiber itself is less than A1, and is preferably 1.1 or more, more preferably 1.2 or more, and more preferably 1.3 or more. Furthermore, it is preferably 2.0 or less, more preferably 1.9 or less, and more preferably 1.8 or less. Specifically, the value of the second fiber diameter ratio A2 itself is preferably 1.1 or more and 2.0 or less, more preferably 1.2 or more and 1.9 or less, and more preferably 1.3 or more and 1.8 or less. 6(a) and 6(b) show another embodiment of the top sheet 2. The central area S in the surface sheet 2 of the embodiment shown in FIG. 6(a) has joint portions S11 and S12 having mutually different shapes. The joint portions S11 are arranged at specific intervals along the longitudinal direction X to form a first joint portion row S31. In addition, the joint portions S12 are also arranged at a specific interval along the longitudinal direction X to form a second joint portion row S32. In addition, two rows of the first joining portion row S31 and one row of the second joining portion row S32 constitute a group, and the group is repeatedly arranged in the horizontal Y. On the other hand, the side area M has only one type of junction, that is, the junction M11. The joint portions M11 are arranged at a specific interval along the longitudinal direction X to form a fourth joint portion row M31. In addition, the joint portions M11 are arranged at a predetermined interval along the longitudinal direction X to form a fifth joint portion row M32. In the fourth joint row M31 and the fifth joint row M32, the distance between the joints 11 along the longitudinal direction X is different, and the distance in the fifth joint row M32 is greater than the distance in the fourth joint row M31. The central area S in the surface sheet 2 of the embodiment shown in FIG. 6(b) has joint portions S11 and S12 having mutually different shapes. The joint portions S11 are arranged at specific intervals along the longitudinal direction X to form a first joint portion row S31. In addition, the joint portions S11 are arranged at a predetermined interval along the longitudinal direction X to form a second joint portion row S32. The first joining portion row S31 and the second joining portion row S32 have the same distance between the joining portions S11 along the longitudinal direction X, but the phases are shifted by half a pitch. On the other hand, the joint portions S12 are arranged at specific intervals along the longitudinal direction X to form a third joint portion row S33. In the central region S, the first joining portion row S31, the third joining portion row S33, the first joining portion row S31, the third joining portion row S33, the second joining portion row S32, and the third joining portion row S33 are in this order They are arranged in the horizontal Y and they form a group, and the group is arranged repeatedly in the horizontal Y. On the other hand, the side area M has only one type of junction, that is, the junction M11. The joint portions M11 are arranged at a specific interval along the longitudinal direction X to form a fourth joint portion row M31. In addition, the joint portions M11 are arranged at a predetermined interval along the longitudinal direction X to form a fifth joint portion row M32. In the fourth joint section row M31 and the fifth joint section row M32, the distance between the joint sections 11 along the longitudinal direction X is the same, but the phases are shifted by half a pitch. In the case of using the front sheet 2 of the embodiment shown in Figs. 6(a) and 6(b) above, the area ratio of the joint is also preferably approximately the same in the central area S and the side area M. In addition, it is also preferable that the number of joints per unit area is greater in the side area M than in the central area S. Thereby, the front sheet 2 exhibits a good texture, and it is not easy to peel or bulge between the two sheets. Above, the present invention has been described based on its preferred embodiments, but the present invention is not limited by the above-mentioned embodiments. For example, the above-mentioned embodiment is an example of applying the absorbent article of the present invention to an expanded disposable diaper, but the present invention can also be applied to other disposable diapers, such as shorts-type disposable diapers. Furthermore, the present invention can also be similarly applied to absorbent articles other than disposable diapers, such as menstrual napkins or incontinence pads. Regarding the above-mentioned embodiment, the present invention further discloses the following absorbent articles. <1> An absorbent article comprising a front sheet, a back sheet, and an absorber disposed between the two sheets, and the front sheet includes a laminate of a first sheet and a second sheet The above-mentioned laminate has a plurality of joint portions produced by the partial joint between the first sheet and the second sheet, and the first sheet protrudes away from the second sheet at a location other than the above-mentioned joint portion, and is formed A plurality of convex parts protruding toward the wearer's body, the above-mentioned front sheet has a central area located at the center in the width direction and extending in the length direction, and a pair of side areas adjacent to the central area and extending in the length direction The shape and/or arrangement pattern of the above-mentioned joint is different in the central region and the side region, the area ratio of the above-mentioned joint is approximately the same in the central region and the side region, and the number of the above-mentioned joint per unit area is the side region More than the central area. <2> The absorbent article as in the above <1>, wherein in the above-mentioned front sheet, the area of the largest area among the above-mentioned joints formed in the central area is set as C, and the area formed in the side area When the area of the largest area of the above-mentioned joints is set to D, it has a relationship of C>D. <3> The absorbent article as in the above <1> or <2>, wherein in the above-mentioned front sheet, the length of the longest length in the longitudinal direction of the above-mentioned joint formed in the central region is set as E. When the length of the longest length in the longitudinal direction of the joints formed in the side region is set to F, the relationship is E>F. <4> The absorbent article according to any one of the above <1> to <3>, wherein with regard to the above-mentioned front sheet, the shear stress of the sheet in the side region is higher than that of the sheet in the central region Shear stress. <5> The absorbent article according to any one of the above <1> to <4>, which has a ventral part arranged on the ventral side of the wearer when worn, a dorsal part arranged on the back, and the like In the lower part of the crotch, the central area and the side area are formed at least in the lower part of the crotch. <6> The absorbent article according to any one of the above <1> to <5>, which has a ventral part arranged on the ventral side of the wearer when worn, a dorsal part arranged on the back, and the like The lower part of the crotch, the central area and the side area are preferably formed from the lower part of the crotch to either or both of the ventral part and the dorsal part, more preferably formed throughout the absorbent body It is formed over the entire length, and more preferably formed over the entire length of the absorbent article. <7> The absorbent article according to any one of the above <1> to <6>, wherein the width of the central region relative to the width of the front sheet is preferably 30% or more, and more preferably 40% or more, It is preferably 70% or less, and more preferably 60% or less. <8> The absorbent article according to any one of the above <1> to <7>, wherein the width of the side region relative to the width of the top sheet is preferably 15% or more and 35% or less, and more preferably Above 20% and below 30%. <9> The absorbent article according to any one of the above <1> to <8>, wherein the sum of the widths of the side regions relative to the width of the front sheet is preferably 30% or more, and more preferably 40 % Or more, preferably 70% or less, more preferably 60% or less. <10> The absorbent article according to any one of the above <1> to <9>, wherein the front sheet is on the side of the second sheet in any of the central area and the side area The surface is substantially flat, and large undulations are formed on the first sheet side. <11> The absorbent article of any one of the above <1> to <10>, which has a longitudinal direction corresponding to the front and back directions of the wearer, and a transverse direction perpendicular to the longitudinal direction, in the center of the front sheet In the area, two types of junctions are formed, and the two types of junctions are the same in terms of rectangles having sides along the longitudinal direction and the lateral direction, but have different shapes. <12> The absorbent article of any one of the above <1> to <11>, which has a longitudinal direction corresponding to the front and back directions of the wearer, and a transverse direction perpendicular to the longitudinal direction, in the center of the front sheet In the region, there are formed two types of joints arranged in rows along the longitudinal direction and separated by a specific distance, one joint forms a first joint row, and the other joint forms alternately arranged adjacent first joints. The second joint row and the third joint row between the joint rows, the second joint row and the third joint row are the same distance between the other joints along the longitudinal direction, and the phases are shifted by half Spacing. <13> The absorbent article of any one of the above <1> to <12>, which has a longitudinal direction corresponding to the front and back direction of the wearer, and a horizontal direction perpendicular to the longitudinal direction, and two types are formed in the above central area A convex portion, one convex portion has a substantially elliptical plan shape whose length along the transverse direction is longer than the length along the longitudinal direction, and the other convex portion has a length along the transverse direction which is approximately the same as the length along the longitudinal direction. The circular top view shape. <14> The absorbent article of any one of the above <1> to <13>, which has a longitudinal direction corresponding to the front and back directions of the wearer and a transverse direction orthogonal to the longitudinal direction, and is formed in the side area Two types of junctions are the same in terms of the two types of junctions having a rectangular shape having sides along the longitudinal direction and the lateral direction, but have different shapes. <15> The absorbent article of any one of the above <1> to <14>, which has a longitudinal direction corresponding to the front and back directions of the wearer and a transverse direction orthogonal to the longitudinal direction, and is formed in the side area Two types of joints are arranged in a row along the longitudinal direction and separated by a specific distance. One joint forms the fourth joint row, and the other joint forms the fourth joint row alternately arranged in the lateral direction. 5 joint part rows, the distance between the one joint part in the fourth joint part row and the other joint part distance in the fifth joint part row are the same, in the fourth joint part row and the fifth joint The arrangement of the above-mentioned joints is staggered by half a pitch. <16> The absorbent article according to any one of the above <1> to <15>, in which two types of protrusions are formed in the center region, and the two types of protrusions have different heights.

<17>

The absorbent article of any one of <1> to <16> above, wherein the protrusions arranged in the side area are lower than the height of the protrusions arranged in the central area, or both The height is the same.

<18>

The absorbent article according to any one of the above <1> to <17>, wherein in the central region and the side region, the arrangement pattern of the joint is different, and the shape of the joint is also different.

<19>

The absorbent article according to any one of the above <1> to <18>, wherein the area ratio of the joint portion in the center region and the side region is preferably 10% or more, and more preferably 15% or more, It is preferably 40% or less, and more preferably 35% or less.

<20>

The absorbent article of any one of <1> to <19> above, wherein the area of the largest area among the joints formed in the central region is set to C, and the joints formed in the side regions When the area of the largest area among the parts is set to D, the area D is preferably 80% or less of the area C, more preferably 70% or less, more preferably 20% or more, and more preferably 30% or more .

<21>

The absorbent article according to any one of the above <1> to <20>, wherein the area of the largest area among the joints formed in the central region is set to C, which will be formed in the side region When the area of the largest area among the junctions of the domain is set to D, the ratio of the sum of the areas of the junctions of the above area C to the sum of the areas of the junctions of the central region is preferably 20% Above, more preferably 30% or more, and the upper limit of the ratio is preferably 80%, and more preferably 70%.

<22>

The absorbent article of any one of the above <1> to <21>, wherein the area of the largest area among the joints formed in the central region is set to C, and the joints formed in the side regions When the area of the largest area among the sections is set to D, the ratio of the sum of the areas of the joints of the above-mentioned area D to the total area of the joints of the side regions is preferably 80% or more, More preferably, it is 90% or more, and the upper limit of the ratio is preferably 100%.

<23>

The absorbent article as described in any one of the above <1> to <22>, which has a longitudinal direction corresponding to the front and back directions of the wearer and a transverse direction orthogonal to the longitudinal direction, in the joint part to be formed in the central area When the length of the longest length along the longitudinal direction is set to E, and the length of the longest length along the longitudinal direction formed in the joining portion of the side region is set to F, the length F is preferably the above The length E is 80% or less, more preferably 70% or less, more preferably 20% or more, and more preferably 30% or more.

<24>

如由表1所示之結果明確得知，實施例之尿布與比較例之尿布相比，正面片材之質感良好，且不易產生片材間之剝離。 [產業上之可利用性] 根據本發明，提供一種具備包含呈現出良好之質感且於2片片材間不易產生剝離或隆起之積層體之正面片材之吸收性物品。The absorbent article according to any one of the above <1> to <23>, wherein the length of the longest length along the longitudinal direction in the joining part formed in the central region is set to E, which will be formed on the side When the length of the longest length along the above-mentioned longitudinal direction of the joints in the region is set to F, the ratio of the total area of the joints of the central region and the above-mentioned length E to the total area of the joints It is preferably 20% or more, more preferably 30% or more, and the upper limit of the ratio is preferably 100%, and more preferably 80%. <25> The absorbent article according to any one of the above <1> to <24>, in which the length of the longest length along the longitudinal direction of the joint formed in the central region is set to E, which will form When the length of the longest length along the longitudinal direction of the joints in the side region is set to F, the sum of the areas of the joints of the side region and the length F is in the sum of the areas of the joints The ratio is preferably 60% or more, more preferably 80% or more, and the upper limit of the ratio is preferably 100%, and more preferably 90%. <26> The absorbent article according to any one of the above <1> to <25>, wherein the value of the shear stress in the central region is preferably 25 N or more, more preferably 30 N or more, and more preferably 34 N or less, more preferably 33 N or less. <27> The absorbent article of any one of the above <1> to <26>, wherein the value of the shear stress in the side region is higher than the shear stress in the center region, preferably 33 N Above, it is more preferably 35 N or more, more preferably 45 N or less, and still more preferably 40 N or less. <28> The absorbent article according to any one of the above <1> to <27>, wherein the area of the largest area of the convex portion in the central region is S _max , and the side region is When the area of the largest convex portion is set to M _max , the relationship of S _max > M _max is satisfied. <29> The absorbent article according to any one of the above <1> to <26>, wherein the basis weight of the non-woven fabric used as the sheet material constituting the first sheet and the second sheet is preferably 10 g/m ² or more, more preferably 15 g/m ² or more, more preferably 40 g/m ² or less, more preferably 35 g/m ² or less. EXAMPLES Hereinafter, the present invention will be described in further detail with examples. However, the scope of the present invention is not limited by this embodiment. As long as it is not specifically mentioned, "%" means "quality %". [Example 1] The front sheet of the disposable diaper "Merries" (registered trademark, manufactured in 2015) manufactured by Kao Co., Ltd. was removed, and the front sheet shown in FIGS. 3 and 4 was replaced with the front sheet , And get disposable diapers. The dimensions of the joints in the front sheet shown in FIGS. 3 and 4 are set as shown below. S11: 1 mm×4 mm, S12: 1 mm×1 mm, M11: 1 mm×4 mm, M12: 1 mm×3 mm (all rectangular) Also, the first sheet that constitutes the front sheet is located The sheet on the opposite side of the wearer's skin contains hot-air non-woven fabric (basic weight 18 g/m ² ). The second sheet also includes hot-air non-woven fabric (basis weight 18 g/m ² ). The hot-air non-woven fabric constituting the first sheet includes a double-layer structure of an upper layer and a lower layer. The upper layer contains a core-sheath composite fiber of polyethylene terephthalate/polyethylene (resin mass ratio 5/5, 2.3 dtex, core-sheath diameter Than 1.57). The lower layer contains polyethylene/polyethylene terephthalate core-sheath composite fiber (resin mass ratio 5/5, 2.3 dtex, core-sheath diameter ratio 1.57) and polypropylene/low melting point polypropylene core-sheath composite fiber (Resin mass ratio 5/5, 2.2 dtex, core sheath diameter ratio 1.42) The mass ratio is 5:5 for blending. The hot-air nonwoven fabric constituting the second sheet includes a polyethylene terephthalate/polyethylene core-sheath composite fiber (resin mass ratio 5/5, 2.3 dtex). [Example 2] In Example 1, the one shown in Fig. 6(a) was used as the top sheet. Except for this, in the same manner as in Example 1, a disposable diaper was obtained. The size of the joint in the front sheet shown in Fig. 6(a) is set as shown below. S11: 1 mm×2 mm, S12: 1 mm×1 mm, M11: 1 mm×1 mm (all rectangular) [Example 3] In Example 1, the one shown in Figure 6(b) is used as the front Sheet. Except for this, in the same manner as in Example 1, a disposable diaper was obtained. The size of the joint in the front sheet shown in Fig. 6(b) is set as shown below. S11: 1 mm×3 mm, S12: 1 mm×1 mm, M11: 1 mm×1 mm (all rectangular) [Comparative Example 1] In Example 1, only the front sheet used in Example 1 was used The side area of the material is formed on the entire area as the front sheet. Except for this, in the same manner as in Example 1, a disposable diaper was obtained. [Evaluation] For the disposable diapers obtained in the examples and comparative examples, the texture of the front sheet and the degree of peeling between the sheets of the front sheet were evaluated by the following methods. The results are shown in Table 1 below. [Softness of the front sheet] Ten mothers of infants who used diapers evaluated the softness of the surface material based on the following criteria for each diaper. The results obtained are shown in Table 1. First, let 10 mothers touch the front sheet of the disposable diaper "Merries" (registered trademark, manufactured in 2015) manufactured by Kao Co., Ltd., based on it (3 points), 1 point (soft), 2 points (Slightly soft), 3 points (same as Merries), 4 points (slightly soft), 5 points (not soft) were evaluated on 5 levels, and the softness was evaluated based on the average value of 10 mothers. [The degree of peeling between the front sheet] Place the acrylic resin board on the sample, assume the pressure when the baby sits down, apply the load to a pressure of 3.5 KPa, and make the acrylic resin with a stroke length = 10 cm The resin board was moved a certain number of times, and the degree of peeling was evaluated by visual observation. Set the degree of peeling of the front sheet of the disposable diaper "Merries" (registered trademark, manufactured in 2015) manufactured by Kao Co., Ltd. to "medium", and set the degree of peeling lower than that to "small". The degree of peeling is higher than it is set to "large". [Table 1]

As is clear from the results shown in Table 1, compared with the diapers of the comparative examples, the diapers of the examples have a good texture of the front sheet and are less likely to cause peeling between the sheets. [Industrial Applicability] According to the present invention, there is provided an absorbent article provided with a front sheet including a laminated body that exhibits a good texture and is unlikely to be peeled or raised between two sheets.

1‧‧‧Diapers 1F‧‧‧Ventral 1M‧‧‧Lower crotch 1R‧‧‧Back side 2‧‧‧Front sheet 3‧‧‧Back sheet 4‧‧‧Absorber 5‧‧‧Side sheet 6‧‧‧Hook and Loop 7‧‧‧Fixed area 40‧‧‧Absorbent core 40a‧‧‧Skin facing side of absorbent core 40b‧‧‧Non-skin facing side of absorbent core 45‧‧‧Packing chip material 50‧‧‧Elastic member 51‧‧‧Elastic member C1‧‧‧Low melting point ingredients C2‧‧‧High melting point ingredients D1‧‧‧The diameter of the low melting point component D2‧‧‧High melting point component diameter M‧‧‧ side area M11‧‧‧Joint M12‧‧‧Joint M21‧‧‧Protrusion M31‧‧‧4th joint line M32‧‧‧The 5th joint line M33‧‧‧3rd convex row M34‧‧‧4th convex row S‧‧‧Central area S11‧‧‧Joint S12‧‧‧Joint S21‧‧‧Protrusion S22‧‧‧Protrusion S31‧‧‧The first joint line S32‧‧‧Second joint line S33‧‧‧3rd joint line S34‧‧‧The first convex row S35‧‧‧The first convex row X‧‧‧ portrait Y‧‧‧ horizontal

Fig. 1 is a disposable diaper of one embodiment of the absorbent article of the present invention. The elastic members of each part are stretched to become a flat unfolded state, and this is observed from the skin facing surface, that is, the front sheet side Top view of diapers. Fig. 2 is a schematic cross-sectional view taken along the line II-II in Fig. 1 in the thickness direction. Fig. 3 is a plan view showing a part of the skin facing surface of the front sheet of the diaper shown in Fig. 1. Fig. 4 is a plan view showing an enlarged main part of Fig. 3. Fig. 5 is a schematic view showing an example of the cross-sectional structure of the first fiber or the second fiber used in the surface sheet of the absorbent article of the present invention. Fig. 6(a) and Fig. 6(b) are plan views showing another embodiment of the front sheet used in the absorbent article of the present invention.

2‧‧‧Front sheet

M‧‧‧Side area

M11‧‧‧Joint

M12‧‧‧Joint

M21‧‧‧Protrusion

M31‧‧‧4th joint line

M32‧‧‧The 5th joint line

M33‧‧‧3rd convex row

M34‧‧‧4th convex row

S‧‧‧Central area

S11‧‧‧Joint

S12‧‧‧Joint

S21‧‧‧Protrusion

S22‧‧‧Protrusion

S31‧‧‧The first joint line

S32‧‧‧Second joint line

S33‧‧‧3rd joint line

S34‧‧‧The first convex row

S35‧‧‧The first convex row

X‧‧‧Vertical

Y‧‧‧Horizontal

Claims (29)

An absorbent article comprising a front sheet, a back sheet, and an absorber arranged between the two sheets, and the front sheet includes a laminate of a first sheet and a second sheet, and the laminate The body has a plurality of joints caused by the partial joints of the first sheet and the second sheet. The first sheet protrudes away from the second sheet at a location other than the joints mentioned above, forming a person facing the wearer A plurality of convex parts protruding from the body, the above-mentioned front sheet has a central area located at the center in the width direction and extending in the longitudinal direction, and a pair of side areas adjacent to the central area and extending in the longitudinal direction, the joint The shape and/or arrangement pattern of the portion is different in the central area and the side area, the area ratio of the joint is approximately the same in the central area and the side area, and the number of the joints per unit area is the side There are more regions than the above-mentioned central region. The absorbent article of claim 1, wherein in the front sheet, the area of the largest area of the joints formed in the central region is set to C, and the joints formed in the side regions When the area of the largest area in the part is set to D, it has the relationship of C>D. The absorbent article according to claim 1, wherein in the front sheet, the length of the longest length in the longitudinal direction of the joint formed in the central region is set to E, When the length of the longest length in the longitudinal direction of the joint formed in the side region is set to F, the relationship is E>F. The absorbent article according to claim 1, wherein with respect to the front sheet, the shear stress of the sheet in the side region is higher than the shear stress of the sheet in the center region. Such as the absorbent article of claim 1, which has a ventral part arranged on the ventral side of the wearer when worn, a dorsal part arranged on the back, and the lower part of the crotch between them, the above-mentioned central area and the above-mentioned side The region is formed on the lower part of the crotch. Such as the absorbent article of claim 1, which has the ventral part arranged on the abdominal side of the wearer when worn, the dorsal part arranged on the back, and the lower part of the crotch between them, the above-mentioned central region and the above-mentioned side The region is formed from the lower part of the crotch to either or both of the ventral part and the dorsal part. The absorbent article of claim 1, wherein the width of the central area is 30% or more and 70% or less relative to the width of the front sheet. The absorbent article according to claim 1, wherein the width of the side region relative to the width of the front sheet is 15% or more and 35% or less. The absorbent article of claim 1, wherein the sum of the widths of the side regions relative to the width of the front sheet is 30% or more and 70% or less. The absorbent article of claim 1, wherein the surface of the front sheet is substantially flat on the side of the second sheet in any of the central region and the side region, and is on the side of the first sheet Formed with large undulations. Such as the absorbent article of claim 1, which has a length direction corresponding to the front and back direction of the wearer and a width direction orthogonal to the length direction, and two types of the above-mentioned joints are formed in the above-mentioned central area of the above-mentioned front sheet The two types of joints are the same in terms of having a rectangular shape with sides along the length direction and the width direction, but have different shapes. Such as the absorbent article of claim 1, which has a length direction corresponding to the front and back direction of the wearer and a width direction orthogonal to the length direction, and in the central area of the front sheet, there is formed along the length Two kinds of the above-mentioned joints are arranged in a row with a specific distance in each direction. One joint forms a first joint row, and the other joint forms a first joint arranged alternately between adjacent first joint rows. The second joint row and the third joint row have the same distance between the second joint row and the third joint row along the longitudinal direction, and the phases are shifted by half a pitch. Such as the absorbent article of claim 1, which has a length direction corresponding to the front and back direction of the wearer and a width direction orthogonal to the length direction, and two kinds of the convex portions are formed in the central area, One type of convex portion has a substantially elliptical top view shape whose length along the width direction is longer than that along the length direction, and another type of convex portion has a length along the width direction that is approximately the same as the length along the length direction. A roughly circular top view shape. Such as the absorbent article of claim 1, which has a length direction corresponding to the front and back direction of the wearer and a width direction orthogonal to the length direction, and two kinds of the above-mentioned joints are formed in the side region, the two kinds The joint portions are identical in terms of having a rectangular shape with sides along the length direction and the width direction, but have different shapes. Such as the absorbent article of claim 1, which has a length direction corresponding to the front and back direction of the wearer and a width direction orthogonal to the length direction, and the side area is formed along the length direction and spaced apart by a specific The distance between the two types of the above-mentioned joints is arranged in a row, one of the joints forms the fourth joint of the row, and the other joints forms the fifth joint of the width direction alternately with the said fourth joints row. The distance between the aforementioned one type of joining portion in the fourth joining portion row is the same as the distance between the aforementioned another type of joining portion in the aforementioned fifth joining portion row, in the fourth joining portion row and the fifth joining portion row, the aforementioned joining portion The configuration is staggered by half a pitch. The absorbent article of claim 1, wherein two kinds of the convex portions are formed in the central area, The above two types of convex portions have different heights. The absorbent article of claim 1, wherein the convex portion arranged in the side area is lower than the height of the convex portion arranged in the central area, or the height of the two is the same. The absorbent article according to claim 1, wherein in the central area and the side area, the arrangement pattern of the joint is different, and the shape of the joint is also different. The absorbent article according to claim 1, wherein the area ratio of the joint portion in the central region and the side region is 10% or more and 40% or less. An absorbent article according to claim 1, wherein the area of the largest area of the joint portions formed in the central region is set to C, and the area of the largest area of the joint portions formed in the side regions is set When the area is set to D, the area D is 20% to 80% of the area C. An absorbent article according to claim 1, wherein the area of the largest area of the joint portions formed in the central region is set to C, and the area of the largest area of the joint portions formed in the side regions is set When this area is set to D, the ratio of the sum of the areas of the joints of the area C to the sum of the areas of the joints of the central region is 20% or more and 80% or less. The absorbent article of claim 1, wherein the above-mentioned joint formed in the above-mentioned central area When the area with the largest area in the area is set as C, and the area with the largest area among the junctions formed in the side region is set as D, the sum of the areas of the junctions of the area D is The ratio of the total area of the joints in the above-mentioned side regions is 80% to 100%. Such as the absorbent article of claim 1, which has a length direction corresponding to the front and back directions of the wearer and a width direction orthogonal to the length direction, and is along the length in the joint portion to be formed in the central region The length of the longest length in the direction is set to E, and when the length of the longest length in the longitudinal direction formed in the joint portion of the side region is set to F, the length F is the length of E Above 20% and below 80%. The absorbent article according to claim 1, wherein the length of the longest length in the longitudinal direction of the joint formed in the central region is set to E, and the joint formed in the side region When the length of the longest length in the above-mentioned longitudinal direction is set to F, the ratio of the sum of the areas of the joints of the above-mentioned central region and the above-mentioned length E to the total area of the joints is 20% Above 100%. The absorbent article according to claim 1, wherein the length of the longest length in the longitudinal direction of the joint formed in the central region is set to E, and the joint formed in the side region When the length of the longest along the above-mentioned length direction is set to F, The ratio of the sum of the area of the joint of the length F in the side region to the sum of the area of the joint is 60% or more and 100% or less. Such as the absorbent article of claim 1, wherein the value of the shear stress in the central area is 25N or more and 34N or less. The absorbent article of claim 1, wherein the value of the shear stress of the side region is higher than the shear stress of the center region, and is 33N or more and 45N or less. The absorbent article of claim 1, wherein the area of the largest area of the convex portion in the central region is set as S _max , and the area of the largest area of the convex portion in the side region is set to M _max is the case, satisfy S _max> M _max of the relationship. The absorbent article according to claim 1, wherein the basis weight of the nonwoven fabric used as the sheet material constituting the first sheet and the second sheet is independently 10 g/m ² or more and 40 g/m ² or less.

Images