Absorbent panty-type items

Abstract

This invention relates to a pant-type absorbent product that can prevent leakage of excrement in a variety of situations. [Solution] The pants-type absorbent article of the present invention comprises an absorbent main body positioned from the crotch region to the ventral and dorsal regions, and an outer body positioned on the non-skin side of the absorbent main body, having a waist end that forms a waist opening. The outer body comprises an outer layer sheet including a non-skin facing surface, and an inner layer sheet made of a separate material from the outer layer sheet and positioned on the skin side of the outer layer sheet. The pants-type absorbent article further comprises a skin-facing sheet positioned on the skin side of the longitudinal end of the absorbent main body and the inner layer sheet around the end, and made of a separate material from the outer body. The skin-facing sheet has an extension portion that extends longitudinally outward from the waist end in at least one of the dorsal or ventral region.

Description

Technical Field

[0001] The present invention relates to a pants-type absorbent article such as a disposable diaper.

Background Art

[0002] A pants-type absorbent article generally includes a waist opening disposed around the abdomen of a wearer and a pair of leg openings disposed around the legs of the wearer, and has a configuration in which an abdominal region and a back region are joined at side edges.

[0003] In order to prevent leakage from the waist side of a pants-type absorbent article, Patent Document 1 describes a pants-type absorbent article having a back-side extending portion formed by extending the back side of an exterior body.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Pants-type absorbent articles are required to prevent excrement leakage in various situations corresponding to excrements (urine and feces) and the posture of the wearer (standing posture, lying posture, sitting posture) and the like.

[0006] The present invention relates to a pants-type absorbent article capable of preventing excrement leakage in various situations.

Means for Solving the Problems

[0007] A pants-type absorbent article according to one aspect of the present invention is: The garment comprises a waist opening positioned around the wearer's abdomen and a pair of leg openings positioned around the wearer's legs, and has a longitudinal direction extending from the wearer's abdomen through the crotch to the back, a transverse direction perpendicular to the longitudinal direction and corresponding to the wearer's left-right direction, and a thickness direction perpendicular to the longitudinal and transverse directions. The aforementioned pant-type absorbent article is divided in the longitudinal direction into an ventral region positioned on the wearer's abdominal side, a dorsal region positioned on the wearer's back and joined to the ventral region at its lateral edge, and a crotch region positioned between the ventral and dorsal regions. The aforementioned pant-type absorbent article is, An absorbent body positioned extending from the crotch region to the ventral region and the dorsal region, The device further comprises an outer casing having a waist end that forms the waist opening, and positioned on the non-skin side of the absorbent body. The exterior body is, An outer layer sheet including a non-skin-facing surface, The material comprises an outer layer sheet and an inner layer sheet, which is made of a separate material and is positioned on the skin side of the outer layer sheet. The aforementioned pant-type absorbent article is, The absorbent body is further provided with a skin-facing sheet, which is disposed on the skin side of the inner layer sheet at the ends in the vertical direction and around the ends, and is made of a separate material from the outer casing. The skin-facing sheet has an extension portion that extends outward in the longitudinal direction from the waist end in at least one of the dorsal region or the ventral region. [Effects of the Invention]

[0008] The absorbent pant-type article of the present invention makes it possible to prevent leakage of excrement in a variety of situations. [Brief explanation of the drawing]

[0009] [Figure 1] This is a perspective view of a pant-type absorbent article according to one embodiment of the present invention. [Figure 2]It is a plan view of the above-mentioned pants-type absorbent article viewed from the skin side in an unfolded state. [Figure 3] It is a cross-sectional view in the vicinity of the waist end portion of the above-mentioned pants-type absorbent article. [Figure 4] (A) is a cross-sectional view showing the operational effect when the above-mentioned pants-type absorbent article is worn, and (B) is a cross-sectional view showing another operational effect when the above-mentioned pants-type absorbent article is worn. [Figure 5] It is a cross-sectional view showing still another operational effect when the above-mentioned pants-type absorbent article is worn. [Figure 6] (A) is a cross-sectional view showing the angle α formed by a virtual surface obtained by extending the skin-facing surface of the skin-side sheet of the above-mentioned pants-type absorbent article and the bent portion where the skin-side sheet is bent, and (B) is a cross-sectional view showing the angle β formed by a virtual surface obtained by extending the non-skin-facing surface of the outer layer sheet of the above-mentioned pants-type absorbent article and the bent portion where the skin-side sheet is bent. [Figure 7] It is a cross-sectional view of a pants-type absorbent article according to a modified example of the above embodiment of the present invention. [Figure 8] It is a cross-sectional view showing the operational effect when the above-mentioned pants-type absorbent article is worn. [Modes for Carrying Out the Invention]

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that constituent elements already described are denoted by the same reference numerals, and descriptions thereof may be omitted.

[0011] In Figure 1, Figure 2 and Figure 3, a pants-type disposable diaper 1 is shown as the absorbent article according to one embodiment of the present invention. Hereinafter, the pants-type disposable diaper 1 will be referred to as the diaper 1.

[0012] As shown in Figure 1, the diaper 1 includes a waist opening 1W and a pair of leg openings 1L, and is worn around the wearer's torso and crotch portion when in use. The waist opening 1W is formed by a waist end portion Wa described later. The diaper 1 has a longitudinal direction X, a lateral direction Y, and a thickness direction Z. The longitudinal direction X extends from the abdominal side of the wearer through the crotch portion to the back side. The lateral direction Y is orthogonal to the longitudinal direction X and corresponds to the left-right direction of the wearer. The thickness direction Z is a direction orthogonal to the longitudinal direction X and the lateral direction Y of the diaper 1.

[0013] In the present specification, "waist side" and "longitudinal direction X outer side" mean the side moving away in the longitudinal direction X from the lateral center line that bisects the diaper 1 in the longitudinal direction X in the unfolded state of the diaper 1. The "longitudinal direction X outer side" includes not only the side approaching the waist end portion Wa but also the side beyond the waist end portion Wa toward the wearer's head. "Leg side" and "longitudinal direction X central side" mean the side approaching the lateral center line in the longitudinal direction X in the unfolded state of the diaper 1. In the present specification, regarding the thickness direction Z, the side close to the wearer's skin when the diaper is worn may be referred to as the skin side, and the side close to the clothing may be referred to as the non-skin side. Further, the "skin-facing surface" means the surface of the diaper or its constituent members that faces the wearer's skin side, that is, the surface that is relatively close to the wearer's skin. The "non-skin-facing surface" means the surface of the diaper or its constituent members that faces the side opposite to the skin-facing surface (the clothing side), that is, the surface that is relatively far from the wearer's skin.

[0014] As illustrated in Figure 2, the diaper 1 is divided, with respect to the longitudinal direction X, into an abdominal region A disposed on the abdominal side of the wearer, a back region B disposed on the back side of the wearer, and a crotch region C disposed between the abdominal region A and the back region B. The abdominal region A, the crotch region C, and the back region B are arranged along the longitudinal direction X. The back region B is joined to the abdominal region A at side edge portions 54, 55 in the lateral direction Y. Note that Figure 2 shows a planar unfolded form in which the diaper 1 is unfolded, the elastic members of each part are stretched, and the diaper is spread flat so as to have design dimensions in a state where the influence of the elastic members is completely eliminated. Unfolding the diaper 1 means unfolding the diaper by separating the side edge portion 54 of the abdominal region A and the side edge portion 55 of the back region B.

[0015] As illustrated in Figures 2 and 3, the diaper 1 comprises an absorbent body 4 and an outer casing 5 positioned on the non-skin-facing side of the absorbent body 4. The outer casing 5 has a waist end Wa that forms a waist opening 1W and side edges 54, 55 in the lateral direction Y.

[0016] The absorbent body 4 is positioned from the crotch region C to the ventral region A and the dorsal region B. As illustrated in Figures 2 and 3, the absorbent body 4 has at least an absorbent 40, and may further have a surface sheet 2, a cuff-forming sheet 7, a back sheet 3, etc. For example, the absorbent body 4 has a configuration in which the back sheet 3, the absorbent 40, and the surface sheet 2 are laminated in the thickness direction Z. The absorbent 40 includes a liquid-retaining absorbent core, and may further include a core wrap sheet covering the absorbent core. The cuff-forming sheet 7 is positioned on the lateral Y side of the surface sheet 2 and forms a leak-proof cuff 70. The materials used for each component included in the absorbent body 4 (back sheet 3, absorbent 40, surface sheet 2, cuff-forming sheet 7, etc.) can be any material used in the art without particular limitation.

[0017] Furthermore, the absorbent body 4 has ends 106 and 107 in the longitudinal direction X. End 106 is the end in the dorsal region B, and end 107 is the end in the ventral region A.

[0018] As illustrated in Figure 3, the outer casing 5 includes an outer layer sheet 51 including a non-skin-facing surface 51s, and an inner layer sheet 52 positioned on the skin side of the outer layer sheet 51. The non-skin-facing surface 51s is the non-skin-facing surface of the outer casing 5 and is also the non-skin-facing surface of the diaper 1. The inner layer sheet 52 is made of a separate material from the outer layer sheet 51. Preferably, an elastic member 71 is placed between the inner layer sheet 52 and the outer layer sheet 51.

[0019] The outer layer sheet 51 and the inner layer sheet 52 are composed of, for example, a sheet material mainly composed of a thermoplastic resin, preferably a nonwoven fabric mainly composed of thermoplastic fibers. The sheet material mainly composed of a thermoplastic resin preferably contains 90% by mass or more of a thermoplastic resin, and more preferably consists of 100% by mass of a thermoplastic resin. Examples of thermoplastic resins include polyolefins such as polyethylene and polypropylene; polyesters such as polyethylene terephthalate; polyamides such as nylon 6 and nylon 66; polyacrylic acid, polyalkyl methacrylate, polyvinyl chloride, polyvinylidene chloride, etc., and one of these can be used alone or in combination of two or more. When the sheet material is composed of a nonwoven fabric, the thermoplastic fibers may be short fibers or long fibers. As thermoplastic fibers, composite fibers such as core-sheath type or side-by-side type, split fibers, irregularly shaped cross-section fibers, heat-shrinkable fibers, etc. can also be used.

[0020] Furthermore, the outer layer sheet 51 and the inner layer sheet 52 may contain cellulosic fibers in addition to thermoplastic fibers. Examples of cellulosic fibers include natural cellulosic fibers such as cotton and pulp, and regenerated cellulosic fibers such as rayon and cupro. These can be used individually or in combination of two or more.

[0021] In this embodiment, the outer casing 5 has a configuration divided into a ventral region A and a dorsal region B. That is, the outer casing 5 has at least a ventral portion 5A that is positioned on the ventral side of the wearer and a dorsal portion 5B that is positioned on the dorsal side of the wearer and is made of a different material from the ventral portion 5A.

[0022] Furthermore, the outer casing 5 of this embodiment includes a crotch area 5C located between the ventral portion 5A and the dorsal portion 5B and positioned in the crotch region C, as illustrated in Figures 1 and 2. The crotch area 5C is positioned on the non-skin-facing surface of the absorbent body 4 and is composed of a separate component from the ventral portion 5A and the dorsal portion 5B. The crotch area 5C has an elastic member 72 positioned on the lateral Y-edge. The elastic member 72 forms a leg gather that contracts along the leg opening 1L.

[0023] Furthermore, as illustrated in Figures 1 and 2, the outer casing 5 has a pair of side seals 8, formed by joining the lateral edge 54 of the ventral portion 5A in the lateral direction Y and the lateral edge 55 of the dorsal portion 5B in the lateral direction Y. In other words, the right side seal 8 has a configuration in which the right lateral edge 54 of the ventral portion 5A and the right lateral edge 55 of the dorsal portion 5B are joined by overlapping them in the thickness direction Z. The left side seal 8 has a configuration in which the left lateral edge 54 of the ventral portion 5A and the left lateral edge 55 of the dorsal portion 5B are joined by overlapping them in the thickness direction Z. The side seals 8 are preferably joined by heat sealing or ultrasonic sealing.

[0024] Furthermore, the diaper 1 further includes a skin-facing sheet 10. As will be described later, the skin-facing sheet 10 has an extended portion 11 that extends outward in the vertical direction X from the waist end Wa, which contributes to preventing leakage of excrement. The configuration of the skin-facing sheet 10 will be described below.

[0025] [Composition of the skin-facing sheet] As illustrated in Figures 2 and 3, the skin-facing sheet 10 is positioned on the skin side of the ends 106 and 107 of the absorbent body 4 in the longitudinal direction X, and the inner layer sheet 52 surrounding the ends 106 and 107. The "inner layer sheet 52 surrounding the ends 106 and 107" refers to the inner layer sheet 52 positioned around the ends 106 and 107 in the longitudinal direction X and / or the transverse direction Y. In this embodiment, the skin-facing sheet 10 includes a ventral skin-facing sheet 10A positioned in the ventral region A, and a dorsal skin-facing sheet 10B positioned in the dorsal region B. In this embodiment, the ventral skin-facing sheet 10A and the dorsal skin-facing sheet 10B are each composed of separate components.

[0026] The ventral skin-facing sheet 10A and the dorsal skin-facing sheet 10B are composed of, for example, a sheet material mainly composed of a thermoplastic resin, preferably a nonwoven fabric mainly composed of thermoplastic fibers. The ventral skin-facing sheet 10A and the dorsal skin-facing sheet 10B may also contain cellulose fibers in addition to thermoplastic fibers.

[0027] In the examples shown in Figures 2 and 3, the ventral skin-facing sheet 10A and the dorsal skin-facing sheet 10B are arranged over substantially the entire width in the lateral direction Y of the ventral portion 5A and the dorsal portion 5B, but may be arranged in a portion of the ventral portion 5A and the dorsal portion 5B in the lateral direction Y. The ventral skin-facing sheet 10A covers the end 107 of the absorbent body 4 and extends to the waist end Wa, but only needs to be arranged on the skin side of at least the end 107 and a portion of the inner layer sheet 52 around it. The dorsal skin-facing sheet 10B covers, for example, the end 106 on the waist end Wa side of the absorbent body 4 and extends outward in the longitudinal direction X beyond the waist end Wa. The ventral skin-facing sheet 10A and the dorsal skin-facing sheet 10B are preferably joined to at least the ends 106 and 107 of the absorbent body 4, and may also be joined to the inner layer sheet 52.

[0028] The skin-facing sheet 10 has an extended portion 11 that extends outward in the longitudinal direction X from the waist end Wa in at least one of the dorsal region B or the ventral region A. In this embodiment, the dorsal skin-facing sheet 10B has the extended portion 11. The extended portion 11 in this embodiment is the portion of the dorsal ventral sheet 10B that extends outward in the longitudinal direction X from the waist end Wa of the dorsal portion 5B.

[0029] The length of the extension portion 11 in the vertical direction X (i.e., the length from the waist end Wa to the vertical X end of the extension portion 11) is preferably, for example, 10 mm to 40 mm, from the viewpoint of suppressing leakage of excrement from the dorsal side. The length of the extension portion 11 in the vertical direction X refers to the minimum length. As shown in Figures 1 and 3, when the waist end Wa of the dorsal portion 5B is a straight line parallel to the horizontal direction Y, the length of the extension portion 11 in the vertical direction X (the length from the waist end Wa of the dorsal portion 5B in the vertical direction X to the upper end of the extension portion 11 in the vertical direction X) is equal across the entire width in the horizontal direction Y. However, if, for example, the waist end Wa of the dorsal portion 5B is a curved shape that is convex outward in the vertical direction X, the length of the extension portion 11 in the vertical direction X is not equal across the entire width in the horizontal direction Y. In such a configuration, the length of the part of the extension portion 11 where the length in the vertical direction X is smallest (minimum length) is defined as the "length of the extension portion 11 in the vertical direction X".

[0030] The longer the extension portion 11, the better it can prevent loose stools and other excrement from leaking out. However, if it is too long, it becomes difficult to pull up the diaper 1, and the extension portion 11 is more likely to curl up. Therefore, it is preferable that the length of the extension portion 11 be 40 mm or less. On the other hand, if the extension portion 11 is too short, the leak-preventing effect of the extension portion 11 is reduced, and it becomes difficult to change its shape. Therefore, it is preferable that the length of the extension portion 11 be 10 mm or more.

[0031] On the other hand, in this embodiment, the ventral skin-facing sheet 10A does not have an extension portion 11, but as will be described later, it may have an extension portion 11. A specific example of the ventral skin-facing sheet 10A having an extension portion 11 will be described later.

[0032] The diaper 1 with the above configuration has an extended portion 11 formed by the skin-facing sheet 10, which prevents leakage of excrement from the waist side in various postures.

[0033] As illustrated in Figure 4(A), for example, when the extended portion 11 is extended to the back of the wearer H, even if soft stool P flows down the groove between the buttocks to the back in a sitting or lying position, the extended portion 11 can block the soft stool P and prevent leakage from the diaper 1. Furthermore, since the extended portion 11 is formed on the skin-facing sheet 10, the gap between the wearer H's skin and the extended portion 11 is reduced compared to, for example, when the extended portion 11 is formed on a sheet attached to the non-skin-facing surface of the outer layer sheet 51, thereby effectively suppressing leakage of excrement.

[0034] Alternatively, as illustrated in Figure 4(B), when pressure is applied to the back of the wearer H, such as in a sleeping position, the extended portion 11 can be folded and positioned between the wearer H's skin and the waist end Wa to more reliably prevent leakage from the back. This more effectively fills the gap between the wearer H's skin and the waist end Wa, more effectively preventing leakage of excrement (loose stool P). Another example of use is to fold the extended portion 11 and use it to wipe away loose stool P, etc., that has adhered to the skin.

[0035] As another example, as illustrated in Figure 5, when pressure is applied to the dorsal region B, such as in a sleeping position, the extended portion 11 can be folded towards the non-skin side of the waist end Wa to prevent moisture from seeping out from the dorsal side under pressure. This adds another layer of sheet to the non-skin side, which can suppress moisture seepage and increase peace of mind when there is a high concern about leakage of watery excrement.

[0036] Thus, according to the diaper 1 (pant-type absorbent item) of this embodiment, the shape of the extension portion 11 can be changed according to the type of excrement (urine and feces) and the wearer's posture (standing, lying down, sitting), allowing for measures to prevent leakage of excrement in each situation. Therefore, according to the diaper 1 (pant-type absorbent item) of this embodiment, leakage of excrement can be prevented in a variety of situations.

[0037] [Example of skin-facing sheet configuration] In this embodiment, the extension portion 11 is preferably easily deformable from the viewpoint of accommodating a variety of usage modes, as described above. For this reason, it is preferable that the extension portion 11 does not contain an elastic member. "The extension portion 11 does not contain an elastic member" means that it does not contain an elastic member that is directly joined to the extension portion 11 and imparts a contractile force. By not including an elastic member in the extension portion 11, the deformability of the extension portion 11 can be further enhanced without its free deformation being hindered by the contractile force of an elastic member.

[0038] Furthermore, it is preferable that the extension portion 11 is made of a single layer of sheet material. A single layer of sheet material refers to a single layer of nonwoven fabric or the like, rather than a sheet material made by laminating or joining two or more layers of sheet material. Also, the term "laminated sheet material of two or more layers" as used here is not limited to a sheet material in which two or more layers of sheet material are integrated, but also includes, for example, a sheet material in which a part of two layers of sheet material is separated to form a pocket. By making the extension portion 11 of a single layer of sheet material, the basis weight of the extension portion 11 can be reduced, and its rigidity can be reduced.

[0039] Specifically, the rigidity of the extension portion 11 is preferably 15 cN or less. By setting the rigidity of the extension portion 11 to 15 cN or less, the deformability of the extension portion 11 is sufficiently increased, making it easier to accommodate a variety of usage configurations. Furthermore, from the viewpoint of further increasing deformability, the rigidity of the extension portion 11 is preferably 12 cN or less, and from the viewpoint of maintaining the desired usage configuration with a certain degree of shape retention, it is preferably 1.0 cN or more, more preferably 1.5 cN or more.

[0040] A method for measuring the rigidity of the extension portion 11 will be described. First, the sheet of the extension portion 11 to be measured is removed from the absorbent material by peeling it off using a cold spray or the like. From the removed sheet, five rectangular pieces are cut out, each with a length of 80 mm along the orientation direction of the constituent fibers of the sheet and a length of 10 mm along the direction perpendicular to the orientation direction. These will be used as test pieces. Each test piece is rolled into a cylindrical shape along its longitudinal direction, and one end and the other end of the test piece are overlapped by 10 mm to create a cylinder with an outer circumference of 70 mm. The upper end (upper end in the direction of the cylinder axis) and lower end of the overlapped portion at both ends are fastened with staples (for example, Max Co., Ltd., No. 10-1M staples) to obtain five cylindrical measurement samples. The orientation of the staples is parallel to the circumferential direction of the measurement sample. Each obtained measurement sample (initial sample width: 30 mm) is set in a Tensilon compression tester (RTA-100, manufactured by Orientec Co., Ltd.), and the maximum load (cN) is measured when compressed in the axial direction of the cylinder (the width direction of the test piece) at a compression rate of 10 mm / min using a circular compression plate with a diameter of 70 mm or more. The same measurement is performed for five measurement samples, and the arithmetic mean of these measurements is taken as the stiffness of the extension 11. The measurement environment is room temperature 23 ± 2°C and relative humidity 50% RH ± 5%.

[0041] In relation to rigidity, the basis weight of the extended portion 11 is preferably 25 g / m², from the viewpoint of reducing rigidity and increasing deformability. 2 More preferably 20 g / m 2 The following applies. Furthermore, the basis weight of the skin-facing sheet 10 is preferably 6 g / m² from the viewpoint of obtaining a certain degree of shape retention. 2 Above, a comfortable 10g / m 2That concludes the explanation. The basis weight of the extension portion 11 shall be the average of the basis weights of five or more locations in the extension portion 11.

[0042] Furthermore, in relation to deformability, as illustrated in Figure 6(A), the angle α between the first folded portion 12, which is formed by folding the extended portion 11 back toward the skin-facing surface 10s of the skin-facing sheet 10, and the virtual surface 108 which is an extension of the skin-facing surface 10s of the skin-facing sheet 10, is preferably 140 degrees or more, more preferably 150 degrees or more. A larger angle α in this way makes it possible to form an extended portion 11 that is easier to fold toward the skin.

[0043] The angle α can be measured as follows: The diaper 1 is positioned so that its vertical direction X is parallel to the vertical direction, and the extended portion 11 is folded back towards the center of the vertical direction X on the skin side to form a first folded portion 12. A load F of 1.2 gf is applied to the lower end of this first folded portion 12 in the vertical direction X. The method of applying the load F is not particularly limited; for example, a weight of 1.2 gf can be attached to the end with tape or the like. Then, the angle between a virtual surface 108, which is an extension of the skin-facing surface 10s on the absorbent body 4 of the skin-facing sheet 10 outward in the vertical direction X, and the first folded portion 12 of the skin-facing sheet 10 is defined as α, and this angle α is measured. For example, an image is taken from the horizontal direction Y that includes angle α, and the average value of angle α measured from three or more images taken can be defined as angle α.

[0044] From a similar viewpoint, as illustrated in Figure 6(B), the angle β between the second folded portion 13, which is formed by folding the extended portion 11 back towards the non-skin-facing surface 51s of the outer sheet 51, and the virtual surface 109 which is an extension of the non-skin-facing surface 51s of the outer sheet 51, is preferably 140 degrees or more, more preferably 150 degrees or more. A larger angle β in this way also makes it possible to form an extended portion 11 that is easier to fold back towards the non-skin side.

[0045] The angle β can be measured as follows: The diaper 1 is positioned so that its vertical direction X is parallel to the vertical direction, and the extended portion 11 is folded back from the waist end Wa towards the center of the vertical direction X on the non-skin side to form a second folded portion 13. A load F of 1.2gf is placed at the lower end of this second folded portion 13 in the vertical direction X as described above. Then, the angle between a virtual surface 109, which is an extension of the non-skin facing surface 51s of the outer layer sheet 51 outward in the vertical direction X, and the second folded portion 13 of the skin surface sheet 10 is defined as β, and this angle β is measured. For example, an image is taken from the horizontal direction Y that includes the angle β, and the average value of the angle β measured from three or more images taken can be defined as the angle β.

[0046] Furthermore, in this embodiment, it is preferable that both angles α and β are 140 degrees or greater. By having large angles α and β in this way, it is possible to form an extended portion 11 that can be easily folded back on both the skin side and the non-skin side.

[0047] Furthermore, as illustrated in Figure 3, in this embodiment, it is preferable that the skin-facing sheet 10 having the extended portion 11 has a bent portion 14 near the waist end Wa, which serves as the starting point for the bend. "Near the waist end Wa" means a position within 5 mm in the vertical direction X from the waist end Wa. By having the bent portion 14 at such a position, the entire extended portion 11, or a large part of the extended portion 11, can be reshaped, and the extended portion 11 can be effectively utilized to effectively prevent leakage of excrement.

[0048] The bent portion 14 is, for example, a portion of the skin-facing sheet 10 having an extended portion 11 that is separated from the absorbent body 4 or inner layer sheet 52, and specifically, it may be the boundary between the joined portion and the unjoined portion of the skin-facing sheet 10 and the absorbent body 4 or inner layer sheet 52. In Figure 3, assuming that the skin-facing sheet 10 is joined to the surface sheet 2 of the absorbent body 4, the portion of the skin-facing sheet 10 having an extended portion 11 that is joined to the end of the surface sheet 2 in the longitudinal direction X is exemplified as the bent portion 14.

[0049] Furthermore, in this embodiment, it is preferable that the skin-facing sheet 10 having the extended portion 11 is not joined to the inner layer sheet 52 at the waist end Wa, or is easily peel-bonded to the inner layer sheet 52 at the waist end Wa. By separating the skin-facing sheet 10 having the extended portion 11 from the inner layer sheet 52 at the waist end Wa, or by allowing it to be easily separated, a wider deformable area can be secured in the skin-facing sheet 10. This increases the deformability of the extended portion 11 of the skin-facing sheet 10, and allows the effect of preventing leakage of excrement to be exerted more effectively.

[0050] Furthermore, "the skin-facing sheet 10 is not bonded to the inner layer sheet 52 at the waist end Wa" means that the skin-facing sheet 10 is not bonded to the inner layer sheet 52 in an area within 5 mm from the waist end Wa towards the center in the vertical direction X. Similarly, "the skin-facing sheet 10 is easily peel-bonded to the inner layer sheet 52 at the waist end Wa" means that the skin-facing sheet 10 is easily peel-bonded to the inner layer sheet 52 in an area within 5 mm from the waist end Wa towards the center in the vertical direction X.

[0051] Furthermore, "easy peeling joint" means that when an adult with average muscle strength grasps the skin-surface sheet 10 and applies force in a direction that peels it away from the inner layer sheet 52, the skin-surface sheet 10 is bonded in a way that allows it to be peeled away from the inner layer sheet 52. The easily peeling jointed portion (hereinafter referred to as the "easy peeling joint portion") can be formed, for example, by making the coating pattern of the hot melt adhesive sparse or by reducing the amount of coating. Specifically, the bonding strength at the easily peeling joint portion of the skin-surface sheet 10 is preferably 0.01N or more, more preferably 0.02N or more, and also preferably 0.20N or less, more preferably 0.18N or less.

[0052] The bonding strength of the easily peelable joint of the skin-facing sheet 10 is measured as follows. First, the easily peelable joint of the inner layer sheet 52 and the skin-facing sheet 10 of the diaper 1 is cut in the longitudinal direction X and the transverse direction Y to be used as a test specimen. The test specimen is cut so that a margin of 10 mm is left in the longitudinal direction X and / or transverse direction Y from the outer edge of the bonded easily peelable joint. Each sheet joined at the easily peelable joint in the test specimen is fixed to the respective chucks of a tensile testing machine (product name "Autograph AGS50A", manufactured by Shimadzu Corporation), and pulled in the 180° direction until complete delamination occurs, and the maximum strength during this period is determined. This maximum strength measurement is performed for five or more different easily peelable joints, and the average value is taken as the bonding strength of the easily peelable joint. The tensile speed is 300 mm / min.

[0053] Furthermore, in this embodiment, the surface of the extension portion 11 may be hydrophilic or hydrophobic depending on the desired function. The term "surface of the extension portion 11" here refers to a concept that includes both the skin-facing surface and the non-skin-facing surface. That is, the "surface of the extension portion 11" to which functionality is imparted includes any of the following patterns: only the skin-facing surface of the extension portion 11, only the non-skin-facing surface of the extension portion 11, or both the skin-facing and non-skin-facing surfaces of the extension portion 11. From the viewpoint of exhibiting functionality in various usage configurations, it is preferable that functionality is imparted to both the skin-facing and non-skin-facing surfaces of the extension portion 11.

[0054] For example, the surface of the extension portion 11 may be hydrophilic. If the surface of the extension portion 11 is hydrophilic, it can be folded and positioned between the waist end Wa and the skin to absorb the excrement and suppress leakage outward in the longitudinal direction X. Alternatively, the extension portion 11 can be used to easily wipe away excrement containing moisture.

[0055] One method for imparting hydrophilicity to the surface of the extension portion 11 is to coat the sheet material, such as a nonwoven fabric, that constitutes the skin-facing sheet 10 with a hydrophilic oil agent (fiber treatment agent). As an indicator of hydrophilicity, the contact angle of the fibers or sheet pieces that constitute the skin-facing sheet 10 can be used. The smaller the contact angle, the higher the hydrophilicity, and the larger the contact angle, the lower the hydrophilicity. Generally, the contact angle θ of fibers classified as hydrophilic is 90° or less, preferably 88° or less, and the smaller the contact angle, the higher the hydrophilicity.

[0056] Alternatively, the surface of the extension portion 11 may be hydrophobic. Having a hydrophobic surface on the extension portion 11 can suppress the leakage of watery stools and urine, thereby improving leak resistance. One method for imparting hydrophobicity to the surface of the extension portion 11 is to apply a water-repellent treatment agent to the sheet material, such as a nonwoven fabric, that constitutes the skin-facing sheet 10. The contact angle of the fibers or sheet pieces constituting the skin-facing sheet 10 can also be used as an indicator of hydrophobicity; a smaller contact angle indicates lower hydrophobicity, while a larger contact angle indicates higher hydrophobicity. Generally, the contact angle θ of fibers classified as hydrophobic is greater than 90°, and the larger the angle, the higher the hydrophobicity.

[0057] The contact angle of the surface of the extension portion 11 is measured as follows. An automatic contact angle meter MCA-J manufactured by Kyowa Interface Science Co., Ltd. is used as the measuring device. Distilled water is used for contact angle measurement. The amount of liquid discharged from the inkjet type water droplet discharge unit (CTC-25 pulse injector manufactured by Cluster Technology Co., Ltd., with a discharge unit pore diameter of 25 μm) is set to 20 picoliters, and water droplets are dropped directly onto the fiber (measurement sample). The dropping process is recorded by a high-speed recording device connected to a horizontally mounted camera. From the perspective of later image analysis, a personal computer with a built-in high-speed capture device is preferable as the recording device. In this measurement, images are recorded every 17 msec. In the recorded video, the first image in which a water droplet lands on the fiber is analyzed using the attached FAMAS software (software version 2.62, analysis method: droplet method, analysis method: θ / 2 method, image processing algorithm: non-reflective, image processing image mode: frame, threshold level: 200, curvature correction: none), and the angle between the air-contacting surface of the water droplet and the fiber is calculated and defined as the contact angle. The sample for measurement is a fiber obtained by taking it from the surface of the extension 11. The fiber is placed on the sample stage of the contact angle meter and kept horizontal, and the contact angle is measured at two different locations for each fiber. At the measurement target area, the contact angles of N=5 fibers are measured to one decimal place, and the average value of the total 10 measured values ​​(rounded to two decimal places) is defined as the contact angle at the measurement target area. If fibers cannot be extracted from the surface of the extension portion 11, or if the extension portion 11 is made of a sheet material other than nonwoven fabric, then tiny sheet pieces (for example, 5 mm x 5 mm) are used instead of fibers.

[0058] [Example of configuration at the waist end] As illustrated in Figure 3, in this embodiment, it is preferable that the outer sheet 51 and the inner sheet 52 each have cut ends 51a and 52a of the sheet material at the waist end Wa. In other words, in this configuration, the outer sheet 51 and the inner sheet 52 are not folded back at the waist end Wa.

[0059] This configuration prevents the outer casing 5 from becoming thicker at the waist end Wa. As a result, even if the extended portion 11 is folded back at the waist end Wa, bulkiness around the waist end Wa is suppressed, and the wearing comfort is maintained. Furthermore, because the outer casing 5 at the waist end Wa is thin, the extended portion 11 can be easily folded back not only on the skin side but also on the non-skin side, promoting a variety of shape changes for the extended portion 11.

[0060] [Examples of extensions in the ventral region] As a modification of this embodiment, the skin-facing sheet 10 may have an extension portion 11 in the ventral region A, as illustrated in Figure 7. That is, the ventral skin-facing sheet 10A has an extension portion 11. This extension portion 11 is a part that extends outward in the longitudinal direction X from the ventral portion 5A of the outer covering 5.

[0061] Thus, by having an extension 11 in the ventral region A, leakage of excretions (e.g., urine) from the ventral side can be prevented, for example, when lying face down.

[0062] For example, as illustrated in Figure 8, the extended portion 11 can be folded and positioned between the wearer H's skin and the waist end Wa. This prevents leakage of urine and other fluids from the ventral side, even when lying face down. Furthermore, on cold days, folding the extended portion 11 in this way and positioning it on the ventral side creates an air layer between the sheets of the extended portion 11, thus providing warmth to the abdominal area.

[0063] [Other embodiments] Although embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the present invention.

[0064] In the above-described embodiment, an example was shown in which the skin-contacting sheet 10 is formed over substantially the entire width in the lateral direction Y of the outer casing 5. However, the invention is not limited to this, and the skin-contacting sheet 10 may be placed in only a portion of the outer casing 5 in the lateral direction Y. However, from the viewpoint of effectively suppressing leakage of excrement, it is preferable that the skin-contacting sheet 10 has a width that covers the entire width in the lateral direction Y of the absorbent body 4 or more.

[0065] Furthermore, the skin-facing sheet 10 may have extensions 11 in both the ventral region A and the dorsal region B. In this case, the effects of preventing leakage from both the dorsal and ventral sides described above can be obtained. However, since the extensions 11 in the ventral region A and the extensions 11 in the dorsal region B may be used in different shapes, it is preferable not to join them with a side seal 8 or the like.

[0066] In the above-described embodiment, the outer casing 5 is shown to be divided into a ventral portion 5A, a dorsal portion 5B, and a crotch portion 5C. However, the embodiment is not limited to this, and the outer casing 5 may be integrated into a single unit in the ventral region A, the dorsal region B, and the crotch region C.

[0067] In the embodiments described above, disposable diapers were shown as an example of a pant-type absorbent article, but the invention is not limited to this, and pant-type sanitary napkins or the like may also be used. This will also prevent leakage of excrement (menstrual blood) from the waist in various positions.

[0068] With regard to the embodiments of the present invention described above, the following additional information is disclosed. <1> A pant-type absorbent article comprising a waist opening positioned around the wearer's abdomen and a pair of leg openings positioned around the wearer's legs, and having a longitudinal direction extending from the wearer's abdomen through the crotch to the back, a transverse direction perpendicular to the longitudinal direction and corresponding to the wearer's left-right direction, and a thickness direction perpendicular to the longitudinal and transverse directions, With respect to the longitudinal direction, it is divided into a ventral region located on the abdominal side of the wearer, a dorsal region located on the dorsal side of the wearer and joined to the ventral region at the lateral edge in the transverse direction, and a crotch region located between the ventral region and the dorsal region. The aforementioned pant-type absorbent article is, An absorbent body positioned extending from the crotch region to the ventral region and the dorsal region, The outer casing further comprises having a waist end that forms the waist opening and being positioned on the non-skin side of the absorbent body, The exterior body is, An outer layer sheet including a non-skin-facing surface, It comprises an inner layer sheet, which is made of a separate material from the outer layer sheet and is positioned on the skin side of the outer layer sheet, The aforementioned pant-type absorbent article is, The absorbent body is further provided with a skin-facing sheet, which is disposed on the skin side of the inner layer sheet at the ends in the vertical direction and around the ends, and is made of a separate material from the outer casing. The skin-facing sheet has an extension portion that extends outward in the longitudinal direction from the waist end in at least one of the dorsal region or the ventral region. Absorbent pants. <2> The extension portion does not include an elastic member. The aforementioned <1> The pant-type absorbent article described above. <3> The extension portion is made of a single layer of sheet material. The aforementioned <1> or <2> The pant-type absorbent article described above. <4> The rigidity of the extension is 15 cN or less. The aforementioned <1> from the above <3> A pant-type absorbent article described in any one of the following. <5> The skin-facing sheet having the extended portion has a bend near the waist end that serves as the starting point for the bend. The aforementioned <1> from the above <4> A pant-type absorbent article described in any one of the following. <6> The skin-facing sheet having the extension portion is not joined to the inner layer sheet at the waist end, or is easily peel-bonded to the inner layer sheet at the waist end. The aforementioned <1> from the above <5> A pant-type absorbent article described in any one of the following. <7> The skin-facing sheet has the extended portion in the back region. The aforementioned <1> from the above <6> A pant-type absorbent article described in any one of the following. <8> The skin-facing sheet has the extended portion in the ventral region. The aforementioned <1> from the above <7> A pant-type absorbent article described in any one of the following. <9> The surface of the extension is hydrophilic. The aforementioned <1> from the above <8> A pant-type absorbent article described in any one of the following. <10> The surface of the extension is hydrophobic. The aforementioned <1> from the above <8> A pant-type absorbent article described in any one of the following. <11> The outer layer sheet and the inner layer sheet each have a cut end of the sheet material at the waist end. The aforementioned <1> from the above <10> A pant-type absorbent article described in any one of the following. <12> The skin-facing sheet is attached to the end of the absorbent body. The aforementioned <1> from the above <11> A pant-type absorbent article described in any one of the following. <13> The length of the extension in the vertical direction is 10 mm or more and 40 mm or less. The aforementioned <1> from the above <12> A pant-type absorbent article described in any one of the following. <14> The rigidity of the extension is 1.0 cN or more. The aforementioned <4> The pant-type absorbent article described above. <15> The basis weight of the extended portion is 10 g / m². 2 More than 25g / m2 The following is The aforementioned <1> from the above <14> A pant-type absorbent article described in any one of the following. <16> The angle between the first folded portion, which is formed by folding the extended portion back toward the skin-facing surface of the skin-facing sheet, and the imaginary surface formed by extending the skin-facing surface of the skin-facing sheet, is 140 degrees or more. The aforementioned <1> from the above <15> A pant-type absorbent article described in any one of the following. <17> The angle between the second folded portion, which is formed by folding the extended portion back towards the non-skin-facing side of the outer sheet, and the imaginary surface formed by extending the non-skin-facing side of the outer sheet, is 140 degrees or more. The aforementioned <1> from the above <16> A pant-type absorbent article described in any one of the following. <18> The easily bendable portion is located in the part of the skin-facing sheet having the extended portion that is separated from the absorbent body or the inner layer sheet. The aforementioned <5> The pant-type absorbent article described above. <19> The extended portion is used by folding it towards the non-skin side of the waist end. The aforementioned <1> from the above <18> A pant-type absorbent article described in any one of the following. <20> The extended portion is used folded between the wearer's skin and the waist end. The aforementioned <1> from the above <19> A pant-type absorbent article described in any one of the following. <21> The skin-facing sheet has a width that is greater than or equal to the width that covers the entire lateral width of the absorbent body. The aforementioned <1> from the above <20> A pant-type absorbent article described in any one of the following. <22> The outer casing comprises a ventral portion positioned in the ventral region and a dorsal portion positioned in the dorsal region and composed of a separate material from the ventral portion. The aforementioned <1> from the above <21> A pant-type absorbent article described in any one of the following. <23> The outer casing is integrated in the ventral region, the dorsal region, and the crotch region. The aforementioned <1> from the above <21> A pant-type absorbent article described in any one of the following. [Explanation of symbols]

[0069] 1. Absorbent pants (diapers) 1L Leg opening 1W Waist opening A ventral region B Dorsal area C Inseam area Wa (waist end) 4 Absorbent body 5. Exterior 51 Outer layer sheet 52 Inner layer sheet 10 Skin-facing sheets 11 Extension

Claims

1. A pant-type absorbent article comprising a waist opening positioned around the wearer's abdomen and a pair of leg openings positioned around the wearer's legs, and having a longitudinal direction extending from the wearer's abdomen through the crotch to the back, a transverse direction perpendicular to the longitudinal direction and corresponding to the wearer's left-right direction, and a thickness direction perpendicular to the longitudinal and transverse directions, With respect to the longitudinal direction, it is divided into a ventral region located on the abdominal side of the wearer, a dorsal region located on the dorsal side of the wearer and joined to the ventral region at the lateral edge in the transverse direction, and a crotch region located between the ventral region and the dorsal region. The aforementioned pant-type absorbent article is, An absorbent body positioned extending from the crotch region to the ventral region and the dorsal region, The outer casing further comprises having a waist end that forms the waist opening and being positioned on the non-skin side of the absorbent body, The exterior body is, An outer layer sheet including a non-skin-facing surface, It comprises an inner layer sheet, which is made of a separate material from the outer layer sheet and is positioned on the skin side of the outer layer sheet, The aforementioned pant-type absorbent article is, The absorbent body is further provided with a skin-facing sheet, which is disposed on the skin side of the inner layer sheet at the ends in the vertical direction and around the ends, and is made of a separate material from the outer casing. The skin-facing sheet has an extension portion that extends outward in the longitudinal direction from the waist end in at least one of the dorsal region or the ventral region. Absorbent pants.

2. The extension portion does not include an elastic member. The pant-type absorbent article according to claim 1.

3. The extension portion is made of a single layer of sheet material. The pant-type absorbent article according to claim 1 or 2.

4. The rigidity of the extension is 15 cN or less. The pant-type absorbent article according to claim 1 or 2.

5. The skin-facing sheet having the extended portion has a bend near the waist end that serves as the starting point for the bend. The pant-type absorbent article according to claim 1 or 2.

6. The skin-facing sheet having the extension portion is not joined to the inner layer sheet at the waist end, or is easily peel-bonded to the inner layer sheet at the waist end. The pant-type absorbent article according to claim 1 or 2.

7. The skin-facing sheet has the extended portion in the back region. The pant-type absorbent article according to claim 1 or 2.

8. The skin-facing sheet has the extended portion in the ventral region. The pant-type absorbent article according to claim 1 or 2.

9. The surface of the extension is hydrophilic. The pant-type absorbent article according to claim 1 or 2.

10. The surface of the extension is hydrophobic. The pant-type absorbent article according to claim 1 or 2.

11. The outer layer sheet and the inner layer sheet each have a cut end of the sheet material at the waist end. The pant-type absorbent article according to claim 1 or 2.

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