JP2014117321A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article, an absorbent core of which is fitted to a wearer's body to hardly cause liquid leakage.SOLUTION: An absorbent article 1 includes: an absorbent core; and a pair of three-dimensional leakage preventing structure. A front area A and a rear area B of the absorbent core 4 are respectively provided with deformation guide parts N1, N2 recessed from side edges S1, S2 inwardly in the width direction and inwardly in the longitudinal direction. The three-dimensional leakage preventing structure 8 has a base end part 8a and a free end part 8b, and the base end part 8a is located on the absorbent core 4 in the skin opposite surface. In the front and rear end part areas in the longitudinal direction Y in the three-dimensional leakage preventing structure 8, the position J for fixing the free end part 8b of the three-dimensional leakage preventing structure 8 is located between the end edges T1, T2 and the deformation guide parts N1, N2, and also between the side edges S1, S2 and the inward end Q in the width direction of the deformation guide parts N1, N2.

Description

  The present invention relates to various absorbent articles including disposable absorbent pads and sanitary napkins.

  2. Description of the Related Art Conventionally, in an absorbent article, a technique is known in which deformation induction portions are provided on the left and right side edges of an absorbent core. For example, a pair of deformation induction portions are formed on the side edges of the front portion and the rear portion of the absorbent core, and a groove portion is formed inward in the width direction of the deformation induction portion, and on the back side of the absorbent core An absorbent article in which an elastic member is disposed at a position adjacent to a side edge has been proposed (see Patent Document 1). According to this absorbent article, the absorbent core is deformed into a ship shape, and liquid leakage is unlikely to occur in the longitudinal direction and the width direction.

  On the other hand, a slit is formed in the absorbent core, an elastic material is disposed on the surface side, and the absorbent core follows the movement of the wearer by controlling the spread of the slit and the expansion by the elastic material, whereby the absorbent article An absorbent article that fits the wearer's body has been proposed (see Patent Document 2).

JP 2008-93289 A JP 2009-153736 A

  In the absorbent article described in Patent Document 1, due to the provision of the deformation induction part and the expansion and contraction member, there is a risk that deformation occurs such that the absorption surfaces at the front and rear end parts of the absorbent body are separated from the wearer's body. Moreover, a gap may be generated between the article and the wearer's body due to the sway of the absorbent core due to the movement of the wearer or the twist of the standing elastic material, and the liquid may leak out.

  Although the absorbent article described in Patent Document 2 has an advantage that a gap is not easily formed between the article and the wearer's body, the formation of a leakage prevention mechanism (for example, a three-dimensional leakage prevention wall) located on the side is provided. Since it is difficult to perform, it is difficult to handle when a large amount of liquid is excreted. As a result, it is difficult to suppress liquid leakage to the side.

  Therefore, this invention relates to the absorbent article which can eliminate the fault which the prior art mentioned above has.

The present invention relates to an absorbent article comprising a longitudinal absorbent core defined by a pair of side edges extending in the longitudinal direction and a pair of end edges extending in the width direction, and a pair of three-dimensional leak-proof structures extending in the longitudinal direction. ,
In the front region and the rear region in the longitudinal direction of the absorbent core, each provided with a pair of deformation guide portions that enter from the side edge toward the inner side in the width direction and the inner side in the longitudinal direction,
The three-dimensional leak-proof structure has a base end portion and a free end portion extending in the longitudinal direction, and the base end portion is on the absorbent core on the skin facing surface,
The position where the free end portion of the three-dimensional leak-proof structure is fixed in the longitudinal front and rear end regions of the three-dimensional leak-proof structure is between the end edge and the deformation guiding portion, and the side edge and the deformation The absorbent article is provided between the inward end in the width direction of the guide portion.

  According to the absorbent article of the present invention, by providing the absorbent core with the deformation induction portion and the three-dimensional leak-proof structure adjacent thereto, the deformation induction portion contracts in the longitudinal direction, and the absorbent core It deforms into a three-dimensional shape between the deformation guiding portions before and after the core. Furthermore, since the base end portion of the three-dimensional leak-proof structure is located on the absorbent core, the free end portion stands up successfully. As a result, the absorbent core fits to the wearer's body and liquid leakage is less likely to occur.

FIG. 1 is a perspective view showing an incontinence pad as one embodiment of the absorbent article of the present invention. 2 is a cross-sectional view in the width direction at the crotch portion when the incontinence pad shown in FIG. 1 is attached. FIG. 3 is a plan view of the absorbent core in the incontinence pad shown in FIG. FIG. 4 is an enlarged plan view showing the first deformation guiding portion in the absorbent core shown in FIG. FIG. 5 is a plan view of the incontinence pad shown in FIG. 1 as viewed from the surface sheet side. 6A is a perspective view showing a state in which the absorbent core in the incontinence pad shown in FIG. 1 is three-dimensionally deformed, and FIG. 6B is a cross-sectional view taken along the line bb in FIG. 6A. FIG. 6C is a cross-sectional view taken along line cc in FIG. Fig.7 (a) is a top view which shows the shape of the deformation | transformation induction | guidance | derivation part which consists of a notch provided in the absorptive core of the conventional absorbent article, FIG.7 (b) is a deformation | transformation induction | guidance | derivation shown in FIG. It is a top view which shows the area | region with low rigidity in a part. FIGS. 8A and 8B are enlarged plan views showing another embodiment of the first deformation guiding portion in the absorbent core. 9A and 9B are plan views showing another embodiment of the absorbent core.

  The present invention will be described below based on preferred embodiments with reference to the drawings. FIG. 1 shows a perspective view of an incontinence pad as an embodiment of the absorbent article of the present invention. 2 is a cross-sectional view in the width direction at the crotch portion when the incontinence pad shown in FIG. 1 is attached. In the present specification, the “upper surface” is a surface of the constituent members of the incontinence pad that faces the wearer's skin when worn. The “lower surface” is a surface that faces away from the wearer's skin when worn.

  1 and 2, the incontinence pad 1 of this embodiment is disposed between a liquid-permeable top sheet 2, a liquid-impermeable or hardly-permeable back sheet 3, and both sheets 2, 3. The liquid-retaining absorbent core 4 is substantially vertically long. The upper, lower and side surfaces of the absorbent core 4 are covered with a liquid-permeable core wrap sheet 5. Furthermore, the pad 1 is provided with a pair of three-dimensional leak-proof structures 8 at positions on both sides along the longitudinal direction of the absorbent core 4 on the surface sheet 2 side.

  As shown in FIG. 3, the absorbent core 4 is defined by a pair of side edges S1, S2 extending in the longitudinal direction Y and a pair of edges extending in the width direction X, that is, a front end edge T1 and a rear end edge T2. It has a vertically long rectangle. However, it is not necessary that the absorbent core 4 is a perfect rectangle. For example, the side edges S1 and S2 may be curved curves that are concave inward in the width direction of the absorbent core 4. Alternatively, the side edges S1 and S2 may be curves that are convex outward in the width direction of the absorbent core 4. In the following description, a portion corresponding to the crotch when the wearer wears or a region near the urination point located in front of the crotch is referred to as a central region C, and the front edge T1 in the longitudinal direction Y from the central region C The regions extending toward the rear end edge T2 are referred to as a front region A and a rear region B. For example, when the incontinence pad 1 has a shape in which the center in the longitudinal direction of the absorbent core 4 faces the wearer's crotch, the central region obtained by dividing the absorbent core 4 into three in the longitudinal direction Y is the central region. Defined as C. Further, the remaining 1/3 adjacent areas adjacent to the central area C are defined as a front area A and a rear area B, respectively.

  The absorbent core 4 is generally composed of a mixed fiber of absorbent material such as particles of superabsorbent polymer and hydrophilic fiber material such as pulp. As the core wrap sheet 5 covering the absorbent core 4, for example, tissue paper or hydrophilic nonwoven fabric is used.

  Similarly to the absorbent core 4, the top sheet 2 and the back sheet 3 are also rectangular. As the surface sheet 2 and the back surface sheet 3, the same materials as those conventionally used for this type of pad can be used. For example, as the surface sheet 2, a hydrophilic nonwoven fabric, a hydrophilic film in which a large number of openings are formed, or the like can be used. A thermoplastic film can be used as the back sheet 3. This film may have moisture permeability. Further, as the back sheet 3, a liquid-impermeable nonwoven fabric such as a spunbond-meltblown-spunbond (SMS) nonwoven fabric can also be used.

  As shown in FIG. 3, the front region A of the absorbent core 4 has a pair of first firsts that enter inward in the width direction X and inward in the longitudinal direction Y from both side edges S1 and S2 in the front region A. Deformation guide portions N1 and N1 are provided. The first deformation guiding portions N1 and N1 are provided at a position away from the front end edge T1 of the absorbent core 4. Furthermore, in the rear region B of the absorbent core 4, a pair of second deformation guiding portions N <b> 2 entering from the side edges S <b> 1 and S <b> 2 in the rear region B toward the inner side in the width direction X and the inner side in the longitudinal direction Y. , N2 are provided. The second deformation guiding portions N2 and N2 are provided at a position spaced a predetermined distance from the rear end edge T2 of the absorbent core 4. The pair of first deformation guiding portions N <b> 1 and N <b> 1 are provided at the same position with respect to the longitudinal direction Y of the absorbent core 4. The pair of first deformation guiding portions N1 and N1 have the same deformed V shape, and form a discontinuous region of the constituent material of the absorbent core 4. In the first deformation guiding portion N1, the constituent material of the absorbent core 4 is not present, or even if it is present, the amount is small. In other words, the first deformation guiding portion N1 is formed by a notch formed in the absorbent core 4. All of these are similarly applied to the second deformation guiding portion N2. With respect to the longitudinal direction of the absorbent core 4, the central region C occupies a position between the first deformation guiding portion N1 and the second deformation guiding portion N2, and the position is approximately at the position between the wearer's crotch. It corresponds.

  Furthermore, the absorptive core 4 has a pair of longitudinal direction deformation | transformation induction | guidance | derivation parts 6 in the both sides along the longitudinal direction Y. A pair of longitudinal direction deformation | transformation induction | guidance | derivation parts 6 are the same length, have the same width, and are left-right symmetric about the longitudinal centerline (not shown) of the absorptive core 4. FIG. The longitudinal deformation guiding portion 6 extends in parallel along the longitudinal direction Y, and is provided at an inner position in the width direction X than the deformation guiding portions N1 and N2. One end and the other end of each longitudinal deformation guide portion 6 are in the same position in the longitudinal direction Y. The longitudinal direction deformation guiding portion 6 is located between the first deformation guiding portion N1 and the second deformation guiding portion N2, and mainly exists in the central region C. Similar to the first and second deformation guiding portions N 1 and N 2 described above, the longitudinal deformation guiding portion 6 also forms a discontinuous region of the constituent material of the absorbent core 4. In the longitudinal direction deformation guiding portion 6, the constituent material of the absorbent core 4 does not exist, and the opening penetrates the thickness direction of the absorbent core 4. However, the longitudinal direction deformation guiding portion 6 is not limited to being configured from an opening, and the longitudinal direction deformation guiding portion 6 may be formed by setting the basis weight to be lower than that of other portions of the absorbent core 4, for example. it can. Or the longitudinal direction deformation | transformation induction | guidance | derivation part 6 can also be formed by compacting more strongly than the other site | part of the absorptive core 4, and making thickness thin.

  The length and width of the longitudinal direction deformation guiding portion 6 may be appropriately determined according to the specific application of the pad 1. The width is 5 mm or more, and the length is 2 of the length of the absorbent core 4. When it is / 3 or more, it is preferable to laminate a liquid diffusion layer made of a nonwoven fabric or the like on the lower surface side of the absorbent core 4 so as to cover the longitudinal direction deformation inducing portion 6. Thereby, it becomes easy to take in the liquid which flows in the longitudinal direction deformation | transformation induction | guidance | derivation part 6 toward the front-back direction in the absorptive core 4, and it can use the absorptive capacity of the absorptive core 4 effectively as a whole. it can.

  FIG. 4 shows an enlarged view of the first deformation guiding portion N1 described above. Although not shown, the second deformation guiding portion N2 has the same configuration as that of the first deformation guiding portion N1. As described above, the first deformation guiding portion N1 is formed by a notch formed in the absorbent core 4. The notch is defined by an edge including a first notch edge C1 located on the side close to the edge T1 and a second notch edge C2 located on the side far from the edge T1. Yes. The first notch edge C1 is a straight line that connects one end P1 located on the side edge S2 and the other end P1 'located inward in the width direction X from the one end P1. The second notch edge portion C2 is a straight line connecting one end portion P2 located on the side edge S2 and the other end portion P2 'located inward in the width direction X from the one end portion P2.

  The length of the first notch edge C1 is longer than that of the second notch edge C2. The first notch edge C1 and the second notch edge C2 extend so as to gradually approach from the side edge S2 toward the inside in the width direction X. The angle θ1 formed between the first notch edge C1 and the width direction X is larger than the angle θ2 formed between the second notch edge C2 and the width direction X. That is, the first notch edge C1 has a greater degree of inclination toward the center in the longitudinal direction Y and the width direction X than the second notch edge C2. As a result, the first deformation guiding portion N1 gradually decreases in width from the side edge S1 inward in the width direction X, and is roughly wedge-shaped.

  The first deformation guiding portion N1 has a third notch edge C3 in addition to the first notch edge C1 and the second notch edge C2. The third notch edge C3 is a straight line connecting the end P1 'and the end P2'. The third notch edge C3 is inclined with respect to the side edges S1 and S2 of the absorbent core 4. As described above, the first deformation guide portion N1 is defined by the first to third cutout edges C1-C3.

  In the first deformation guiding portion N1 defined by the three notch edges C1-C3 described above, two inner ends, that is, on the end portion P2 ′, are positioned inward in the width direction X. It has a first inward end Q1 located and a second inward end Q2 located on the end P1 ′. The first inner end Q1 is located outward in the width direction X with respect to the second inner end Q2, and is located inward in the longitudinal direction Y. In this specification, the inward end is a position where the extending direction of the notch edge that defines the deformation guiding portion changes in the inner region of the first and second deformation guiding portions. Say.

  As shown in FIG. 4, a straight line passing through the end P1 of the first notch edge and extending in the width direction X is L1, passing through the end P2 of the second notch edge and in the width direction X. When the extending straight line is L2, the first inner end Q1 described above is located outside the region R defined by L1 and L2. Specifically, the first inner end Q1 is located closer to the inner side in the longitudinal direction Y than L2. On the other hand, the second inner end Q2 is located in the region R.

  Returning to FIG. 2, as shown in FIG. 2, the top sheet 2 covers the upper surface of the absorbent core 4. Furthermore, the topsheet 2 extends outward in the width direction X from the left and right side edges S1, S2 of the absorbent core 4. On the other hand, the back sheet 3 covers the lower surface of the absorbent core 4. The back sheet 3 also extends outward in the width direction X from the left and right side edges S1, S2 of the absorbent core 4. The top sheet 2 and the back sheet 3 extending outward in the width direction X from the side edges S1 and S2 of the absorbent core 4 are joined to each other to form a side flap 7.

  The three-dimensional leak-proof structure 8 is composed of a single sheet 9 for forming a three-dimensional leak-proof structure extending in the longitudinal direction Y. The sheet 9 for forming a three-dimensional leak-proof structure is arranged on both sides along the longitudinal direction Y of the pad 1 so that one side edge extending along the longitudinal direction Y coincides with the position of the side edge of the side flap 7. ing. The three-dimensional leak-proof structure forming sheet 9 is arranged so as to overlap the top sheet 2 from the position of the side edge of the side flap 7 toward the inside in the width direction X. And the sheet | seat 9 for three-dimensional leakage-proof structure formation has stood up toward the wearer's body in the position of the base end part 8a on the absorbent core 4. The standing sheet 9 for forming the three-dimensional leak-proof structure is folded back at the position of the free end 8b, the folded portion returns to the position of the base end 8a, and further toward the outside in the width direction X, the three-dimensional leak-proof structure The structure forming sheet 9 enters the lower surface side. In this way, the three-dimensional leak-proof structure 8 defined between the base end portion 8a extending in the longitudinal direction Y and the free end portion 8b also extending in the longitudinal direction Y is formed. The three-dimensional leak-proof structure 8 exists at least in the central region in the longitudinal direction Y of the pad 1. Further, the three-dimensional leak-proof structure 8 extends from the central region in the longitudinal direction Y toward the front end edge T1 and the rear end edge T2 of the absorbent core 4 respectively. At the position of the free end portion 8b in the three-dimensional leak-proof structure 8, the three-dimensional leak-proof structure forming sheet 9 is folded back and extends in the same direction as the direction in which the free end portion 8b extends. The elastic member 8c is bonded and fixed in the extended state. Since the three-dimensional leak-proof structure 8 has such a structure, the base end portion 8 a in the three-dimensional leak-proof structure 8 is located on the absorbent core 4 on the skin facing surface of the pad 1. It is preferable that the base end portion 8a is positioned on the absorbent core 4 because the free end portion of the three-dimensional leak-proof structure 8 can be erected successfully in the mounted state of the pad 1.

  The top view which looked at the incontinence pad 1 from the surface sheet 2 side is shown by FIG. The sheet 9 forming the three-dimensional leak-proof structure 8 described above is joined to the top sheet 2 in the area indicated by hatching in FIG. Specifically, in the central region C in the longitudinal direction Y, the three-dimensional leak-proof structure forming sheet 9 is joined to the topsheet 2 in a region between the base end portion 8 a and the side edge of the side flap 7. . In the front area A and the rear area B in the longitudinal direction, the three-dimensional leak-proof structure forming sheet 9 is joined to the surface sheet 2 in a region between the base end 8 a and the side edge of the side flap 7. In addition to this, the region between the free end portion 8b and the side edge of the side flap 7 is also joined. And the position J which fixes the free end part 8b of the three-dimensional leak-proof structure 8 in the front-and-rear end part of the longitudinal direction Y in the three-dimensional leak-proof structure 8 is the edge T1, T2 of the absorptive core 4, and deformation | transformation induction part N1, The second is located between N2 and the inner edges Q1 and Q2 in the width direction X of the side edges S1 and S2 of the absorbent core 4 and the deformation guiding portions N1 and N2 further toward the inner side in the width direction. And the inner end Q2. In particular, the position J where the free end portion 8b is fixed is between the end edges T1, T2 of the absorbent core 4 and the deformation induction portions N1, N2, and the deformation induction portion N1, more than the center position H (see FIG. 5). It is preferable that it is close to N2. By fixing the free end portion 8b at such a position, the deformation guiding portions N1 and N2 are likely to shrink due to the contraction of the elastic member 8c, and the base end portion 8a and the free end portion of the three-dimensional leak-proof structure 8 It is easy to obtain a strain relaxation effect by the sheet 9 for forming a three-dimensional leak-proof structure located between the two. From this point of view, the distance F (see FIG. 5) between the position J for fixing the free end 8b and the deformation guiding portions N1, N2 is preferably 10 mm or more, more preferably 15 mm or more, and more preferably 20 mm or more. More preferably. The interval F is preferably 50 mm or less, more preferably 40 mm or less, and even more preferably 30 mm or less. For example, the interval F is preferably 10 mm or more and 50 mm or less, more preferably 15 mm or more and 40 mm or less, and further preferably 20 mm or more and 30 mm or less.

  In the incontinence pad 1 of the present embodiment having the above-described configuration, the free end portion 8b straddles the first and second deformation induction portions N1 and N2 in a state where the pad 1 is extended to a plane. Also, when the stretched state is released to the natural state, the free end portion 8b straddles the first and second deformation guiding portions N1 and N2. Due to this, the absorbent core 4 is affected by the contraction of the elastic member 8a disposed in the vicinity of the free end portion 8b, and in each of the first and second deformation induction portions N1, N2. Shrinkage occurs. In addition to this shrinkage, the position of the longitudinal direction deformation guiding portion 6 (see FIG. 3) acts as a flexible shaft for bending, and in the mounted state of the pad 1, the absorbent core 4 is three-dimensional as shown in FIG. Transforms into In the three-dimensionally deformable absorbent core 4, for example, a wrinkle or the like is less likely to occur in the central area C for the reason described later, and thus liquid leakage from the side is less likely to occur. C becomes easy to fit a wearer's crotch part. In particular, at least the inner end Q1 of the inner ends Q1 and Q2 in the width direction X of the deformation guide portions N1 and N2 is located outside the region R described above and inward in the longitudinal direction from L2. When the three-dimensional deformation of the absorbent core 4, the front area A and the rear area B become difficult to deform, and even after the three-dimensional deformation of the absorbent core 4, the front area A and the rear area B are The flat shape before deformation is maintained. As a result, according to the pad 1 of this embodiment, liquid leakage is less likely to occur. In FIG. 6, the thickness of the absorbent core 4 is drawn thinner than the actual thickness in order to facilitate understanding of the state in which the absorbent core 4 is three-dimensionally deformed.

  By the way, in the conventional absorbent article, from the viewpoint of portability and the like, the absorbent article is folded along a folding line extending in the width direction of the absorbent article. In an absorbent article that performs such folding, if the absorbent core is provided with a cut or the like in which no absorbent material exists, a flexible shaft for folding is easily formed at that position. As a result, a large number of folds extending in the width direction are generated on the surface sheet and the like, and the liquid is guided to the folds to flow sideways, so that liquid leakage is likely to occur. In particular, the conventionally known incision shown in FIG. 7 (a) has a sudden decrease in the rigidity of the portion V in the width direction passing through the V-shaped tip. There was a lot of wrinkles in an absorbent article. On the other hand, when the deformation guide portions N1 and N2 of the present embodiment are employed, the portion having the minimum bending rigidity does not become one place as shown in FIG. 7B, but has a predetermined width along the longitudinal direction Y. Therefore, the bending flexible shaft is formed with a width within the range G. Due to these reasons, generation of wrinkles is suppressed. As a result, it is possible to prevent the liquid from flowing to the side and causing liquid leakage.

  From the viewpoint of further enhancing the above advantageous effects, among the inner ends Q1 and Q2 of the deformation guide portions N1 and N2, the second inner end Q2 positioned in the innermost side in the width direction X and the side edge S1. , S2 and the distance W (see FIG. 4) are preferably 10% or more of the width of the absorbent core 4 and more preferably 15% or more. Further, the distance W is preferably 30% or less of the width of the absorbent core 4 and more preferably 25% or less. For example, the distance W is preferably 10% to 30% of the width of the absorbent core 4, and more preferably 15% to 25%. By setting the position of the second inward end Q2 in this way, it becomes easy to be influenced by the contraction of the elastic member 8c, and the side portion of the central region C in the absorbent core 4, that is, the longitudinal deformation guide portion 6 is obtained. As a result, it is possible to successfully start up the portion located outward in the width direction X.

  From the same viewpoint, the distance D (see FIG. 5) between the base end portion 8a and the free end portion 8b in the three-dimensional leak-proof structure 8 is the width direction of the inner ends Q1, Q2 of the deformation guide portions N1, N2. The distance W between the second inner end Q2 located on the innermost side of X and the side edge is preferably 0.3 times or more, more preferably 0.4 times or more, and 0 More preferably, it is 5 times or more. The distance D is preferably 1.0 times or less, more preferably 0.9 times or less, and even more preferably 0.8 times or less with respect to the distance W. For example, the distance D is preferably 0.3 to 1.0 times the distance W, more preferably 0.4 to 0.9 times, and more preferably 0.5 to 0 times. More preferably, it is 8 times or less.

  Further, from the same viewpoint, the base end portion 8a of the three-dimensional leak-proof structure 8 has a distance D ′ (see FIG. 5) from the side edges S1 and S2 of the absorbent core 4 that is not less than 0 times the above-described distance W. It is preferably 0.1 times or more, more preferably 0.2 times or more. The distance D ′ is preferably 0.7 times or less, more preferably 0.6 times or less, and even more preferably 0.5 times or less with respect to the distance W. For example, the distance D ′ is preferably 0 to 0.7 times the distance W, more preferably 0.1 to 0.6 times, and more preferably 0.2 to 0. More preferably, it is 5 times or less. The free end portion 8b is not located inward in the width direction X with respect to the deformation guide portions N1 and N2, regardless of the position of the base end portion 8a.

  In each of the deformation guiding portions N1 and N2, the distance K1 (see FIG. 4) between the end portion P1 and the end portion P2 in the longitudinal direction Y is preferably 5 mm or more, and more preferably 10 mm or more. The distance K1 is preferably 30 mm or less, and more preferably 20 mm or less. For example, the distance K1 is preferably 5 mm or more and 30 mm or less, and more preferably 10 mm or more and 20 mm or less.

  Further, in each of the deformation guiding portions N1 and N2, a distance in the longitudinal direction Y between the end portion P1 ′ and the end portion P2 ′ (not a linear distance between the end portion P1 ′ and the end portion P2 ′) K2 (FIG. 4). Is preferably shorter than the distance K1 described above. In addition, the distance K2 is preferably 0 mm or more, and more preferably 5 mm or more, on condition that the distance K2 is shorter than the distance K1. The distance K2 is preferably 25 mm or less, and more preferably 15 mm or less. For example, the distance K2 is preferably 0 mm or more and 25 mm or less, and more preferably 5 mm or more and 15 mm or less.

  Further, the distance M (see FIG. 3) in the longitudinal direction Y between the first deformation guiding portion N1 and the second deformation guiding portion N2 located on the same side along the longitudinal direction Y is determined by the deformation guiding portions N1, N2. In terms of the distance between the end portions P1, the thickness is preferably 50 mm or more, and more preferably 60 mm or more. The distance M is preferably 150 mm or less, more preferably 120 mm or less, and even more preferably 100 mm or less.

The absorbent core 4 can appropriately set the basis weight according to the specific application of the pad 1. Generally speaking, the basis weight of the absorbent core 4 is preferably 150 g / m ² or more, more preferably 300 g / m ² or more, and even more preferably 400 g / m ² or more. The basis weight of the absorbent core 4 is preferably 900 g / m ² or less, more preferably 700 g / m ² or less, and even more preferably 600 g / m ² or less. For example, the basis weight of the absorbent core 4 is preferably 150 g / m ² or more and 900 g / m ² or less, more preferably 300 g / m ² or more and 700 g / m ² or less, and 400 g / m ² or more and 600 g / m ² or less. More preferably, it is m ² or less. The absorbent core 4 preferably contains a superabsorbent polymer, and the ratio is preferably (pulp / polymer) 1/3 or more and 4/1 or less.

  FIGS. 8A and 8B show another embodiment of the first deformation guiding portion N1. Although not shown, these embodiments are also applied to the second deformation guiding portion N2. In the embodiment shown in FIG. 8A, the third notch edge C3 is different from the above-described embodiment. Specifically, in the above-described embodiment, the third notch edge C3 is inclined with respect to the side edges S1 and S2 as shown in FIG. The third cut-out edge C3 is parallel to the side edges S1 and S2. Therefore, with respect to the width direction X, the positions of the end P1 'and the end P2' are the same. Employing the deformation guiding portion N1 of the present embodiment is advantageous in that the flexibility of the bending flexible shaft is uniform within the range G.

  In the embodiment shown in FIG. 8B, the end portion located inward in the width direction X in the first notch edge portion C1 and the inward portion in the width direction X in the second notch edge portion C2. The position with the end to be matched. Therefore, in the present embodiment, unlike the previous embodiments, the third notch edge portion C3 does not exist, and the deformation guiding portion N1 has a triangular shape. P, which is the intersection of the first notch edge C1 and the second notch edge C2, is also the inner end Q that exists only in one place in the deformation guiding part N1. The inner end Q is located outside the region R between the straight line L1 and the straight line L2. Specifically, it is located inward in the longitudinal direction Y from the straight line L2. The first notch edge C1 and the second notch edge C2 are both inclined with respect to the width direction X. In the deformation guiding portion N1 of the present embodiment, similarly to the deformation guiding portion described so far, the portion having low rigidity when the absorbent core 4 is bent is not one portion, and the portion has a width along the longitudinal direction Y. Therefore, it has the effect of suppressing wrinkles caused by bending.

  In addition, in the embodiment shown in FIGS. 8A and 8B, the explanation detailed in the embodiment shown in FIG.

  FIGS. 9A and 9B show another embodiment of the absorbent core 4. The absorbent core 4 shown in FIG. 9A has a generally rectangular shape, but is different from the absorbent core 4 of the embodiment shown in FIG. 3 in that the four corners of the rectangle are rounded. doing. In addition, the absorbent core 4 of the present embodiment is also the absorbent core of the embodiment shown in FIG. 4 and different. Furthermore, the absorptive core 4 of this embodiment is different from the absorptive core 4 of the embodiment shown in FIG. 2 in that the longitudinal direction deformation guiding portion is not formed. The absorbent core 4 according to this embodiment is advantageous in that distortion due to deformation of the absorbent body hardly occurs because the inner end Q is one place.

  The outline of the absorbent core 4 shown in FIG. 9B is the same as that shown in FIG. 9A, and the four corners of the rectangle are rounded. Moreover, in this embodiment, compared with the absorptive core 4 of embodiment shown in FIG. 3, each deformation | transformation induction | guidance | derivation part N1, N2 is all biased and formed near the front end edge T1. As a result, the area closer to the front end edge T1 than the first deformation guiding portion N1 is smaller than the area closer to the rear end edge T2 than the second deformation guiding portion N2. The absorbent core 4 of this embodiment is advantageous in that the side absorbent body stands up around the urination point.

  In addition, in the embodiment shown in FIGS. 9A and 9B, the explanation detailed in the embodiment shown in FIG. 3 and FIG.

  Moreover, each above embodiment can be combined suitably in the range which does not impair the effect of this invention.

  The absorbent article of the present invention can be used, for example, as an incontinence pad as described above. Moreover, it can also be used as an absorbent article other than this, for example, an auxiliary pad disposed and used inside a disposable diaper, a deployable disposable pad provided with fastening means using a fastening tape, and a sanitary napkin.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment. For example, in the above-described embodiment, the shape of the first deformation guiding portion N1 formed in the absorbent core 4 is the same as the shape of the second deformation guiding portion N2, but instead of this, The shape of the deformation guiding portion N1 may be different from the shape of the second deformation guiding portion N2.

  Also, in the deformation guiding portion N1 shown in FIGS. 4 and 8A, the first inner end Q1, which is one of the two inner ends Q1, Q2, is a straight line L1. The second inner end Q2 which is located outside the region R defined by L2 and the other inner end is located in the region R. Instead of this, the two inner ends The ends Q1 and Q2 may be located outside the region R. For example, the two inner ends Q1, Q2 may be positioned inward in the longitudinal direction Y with respect to the straight line L2.

  Further, in each of the above-described embodiments, the notch edges C1-C3 that define the deformation guiding portions N1, N2 are all straight lines, but instead of these, the notch edges C1-C3. At least one of these may be a curve.

This invention discloses the following absorbent articles further regarding embodiment mentioned above.
<1>
In an absorbent article comprising a vertically long absorbent core defined by a pair of side edges extending in the longitudinal direction and a pair of edges extending in the width direction, and a pair of three-dimensional leak-proof structures extending in the longitudinal direction,
In the front region and the rear region in the longitudinal direction of the absorbent core, each provided with a pair of deformation guide portions that enter from the side edge toward the inner side in the width direction and the inner side in the longitudinal direction,
The three-dimensional leak-proof structure has a base end portion and a free end portion extending in the longitudinal direction, and the base end portion is on the absorbent core on the skin facing surface,
The position where the free end portion of the three-dimensional leak-proof structure is fixed in the longitudinal front and rear end regions of the three-dimensional leak-proof structure is between the end edge and the deformation guiding portion, and the side edge and the deformation An absorptive article located between the inner end in the width direction of the guide portion.

<2>
Having side flaps extending outward in the width direction from the side edges of the absorbent core;
The three-dimensional leak-proof structure is composed of a vertically long three-dimensional leak-proof structure forming sheet extending in the longitudinal direction,
In the front region and the rear region in the longitudinal direction, the three-dimensional leak-proof structure forming sheet is joined in a region between a free end and a side edge of the side flap. Absorbent articles.
<3>
<1> or more preferably 10 mm or more, more preferably 15 mm or more, and even more preferably 20 mm or more when the distance F between the position where the free end is fixed and the deformation induction part is defined. The absorbent article as described in <2>.
<4>
When the distance between the position where the free end is fixed and the deformation guiding portion is F, the distance F is preferably 50 mm or less, more preferably 40 mm or less, and even more preferably 30 mm or less. The absorbent article according to any one of <1> to <3>.
<5>
In a state where the absorbent article is stretched flat, the free end portion straddles the first and second deformation induction portions,
The absorbent article according to any one of <1> to <4>, wherein the free end portion straddles the first and second deformation guide portions even when the stretched state is released to be a natural state.
<6>
The deformation induction part is composed of a notch formed in the absorbent core,
The notch is defined by an edge including a first notch edge located on a side near the edge and a second notch edge located on a side far from the edge;
A straight line that passes through the end P1 of the first notch edge located on the side edge and extends in the width direction is L1, and an end P2 of the second notch edge located on the side edge is defined as L1. When the straight line extending in the width direction and extending in the width direction is L2, the inner ends in the width direction of the deformation guiding portion are located outside the region defined by L1 and L2, <1> to <5> The absorbent article according to any one of the above.

<7>
The deformation induction part is composed of a notch formed in the absorbent core,
The notch is defined by an edge including a first notch edge located on a side near the edge and a second notch edge located on a side far from the edge;
Any of <1> to <6>, wherein the first and second cutout edges are both straight lines, and the first cutout edge is longer than the second cutout edge. Or an absorbent article according to claim 1.
<8>
The deformation induction part is composed of a notch formed in the absorbent core,
The notch is defined by an edge including a first notch edge located on a side near the edge and a second notch edge located on a side far from the edge;
Any one of <1> to <7>, wherein the first notch edge and the second notch edge extend so as to gradually approach each other toward the inner side in the width direction from the side edge. 2. The absorbent article according to 1.
<9>
The deformation induction part is composed of a notch formed in the absorbent core,
The notch is defined by an edge including a first notch edge located on a side near the edge and a second notch edge located on a side far from the edge;
Any one of <1> to <8>, wherein an angle θ1 formed between the first notch edge and the width direction is larger than an angle θ2 formed between the second notch edge and the width direction. Absorbent article as described in 1.
<10>
The deformation induction part is composed of a notch formed in the absorbent core,
The notch is defined by an edge including a first notch edge located on a side near the edge and a second notch edge located on a side far from the edge;
<1> thru | or <9> in which the grade of the inclination toward the center direction of the longitudinal direction Y and the width direction X is larger in the 1st notch edge part than the 2nd notch edge part. The absorbent article as described in any one of these.
<11>
The first deformation inducing portion is any one of the above <1> to <10>, in which the width gradually decreases from the side edge toward the inner side in the width direction, and generally has a wedge shape. Absorbent article according to item.
<12>
The deformation induction part is composed of a notch formed in the absorbent core,
The notch is defined by an edge including a first notch edge located on a side near the edge and a second notch edge located on a side far from the edge;
The first deformation inducing portion has a third notch edge in addition to the first notch edge and the second notch edge, and any one of <1> to <11>. Absorbent article according to item.
<13>
A 3rd notch edge part is an absorbent article as described in said <12> inclined with respect to the said side edge of the said absorptive core.
<14>
The third notch edge is parallel to the side edge, whereby the end of the first notch edge located on the side edge in the width direction and the side edge The absorbent article according to <12> or <13>, wherein the positions of the end portions of the second notch edge portion located above are the same.
<15>
The deformation guiding portion has the inner end in two places;
The deformation induction part is composed of a notch formed in the absorbent core,
The notch is defined by an edge including a first notch edge located on a side near the edge and a second notch edge located on a side far from the edge;
A straight line that passes through the end P1 of the first notch edge located on the side edge and extends in the width direction is L1, and an end P2 of the second notch edge located on the side edge is defined as L1. When the straight line extending in the width direction is L2, the first inner end is located outside the region defined by L1 and L2, and the second inner end is located within the region. The absorbent article according to any one of <1> to <14>.
<16>
The deformation guiding portion has the inner end in two places;
The absorbent article according to <12>, wherein two inner ends are located outside a region defined by the L1 and the L2.
<17>
Of the two inner ends of each deformation guiding portion, the distance W between the second inner end located in the innermost side in the width direction X and the side edge is preferably the width of the absorbent core. The absorbent article according to <15> or <16>, which is 10% or more, more preferably 15% or more.
<18>
The absorbent article according to any one of <15> to <17>, wherein the distance W is preferably 30% or less, more preferably 25% or less, of the width of the absorbent core.
<19>
The distance D between the base end portion and the free end portion in the three-dimensional leak-proof structure is the distance between the inner end located in the innermost direction in the width direction X and the side edge among the inner ends in each deformation guiding portion. The absorbent article according to any one of <1> to <18>, which is preferably 0.3 times or more, more preferably 0.4 times or more, and further preferably 0.5 times or more with respect to W. .
<20>
The distance D is preferably not more than 1.0 times, more preferably not more than 0.9 times, and still more preferably not more than 0.8 times the distance W, <1> to <19> Absorbent article as described in 1.
<21>
The base end portion of the three-dimensional leak-proof structure is an inner end whose distance D ′ from the side edge of the absorbent core is located at the innermost end in the width direction X among the inner ends of the deformation guide portions. <1> to <20>, wherein the distance W between the edge and the side edge is preferably 0 times or more, more preferably 0.1 times or more, and still more preferably 0.2 times or more. Absorbent article.
<22>
The distance D ′ is preferably not more than 0.7 times, more preferably not more than 0.6 times, and still more preferably not more than 0.5 times the distance W, any one of the above items <1> to <21> Or an absorbent article according to claim 1.
<23>
The deformation induction part is composed of a notch formed in the absorbent core,
The notch is defined by an edge including a first notch edge located on a side near the edge and a second notch edge located on a side far from the edge;
In each deformation guiding portion, the longitudinal direction Y between the end portion of the first notch edge portion located on the side edge and the end portion of the second notch edge portion located on the side edge is determined. The absorbent article according to any one of <1> to <22>, wherein the distance K1 is preferably 5 mm or more, more preferably 10 mm or more.
<24>
The absorbent article according to any one of <1> to <23>, wherein the distance K1 is preferably 30 mm or less, more preferably 20 mm or less.
<25>
The deformation induction part is composed of a notch formed in the absorbent core,
The notch is defined by an edge including a first notch edge located on a side near the edge and a second notch edge located on a side far from the edge;
The distance M in the longitudinal direction Y between the first deformation guiding portion and the second deformation guiding portion located on the same side along the longitudinal direction Y is the first distance located on the side edge in each deformation guiding portion. The absorbent article according to any one of the above items <1> to <24>, which is represented by a distance between the end portions of the cutout edge portion, preferably 50 mm or more, more preferably 60 mm or more.
<26>
The absorbent article according to any one of <1> to <25>, wherein the distance M is preferably 150 mm or less, more preferably 120 mm or less, and still more preferably 100 mm or less.
<27>
The absorbent core according to any one of <1> to <26>, wherein the absorbent core is composed of a mixed fiber of superabsorbent polymer particles and an absorbent material such as a hydrophilic fiber material such as pulp. Goods.
<28>
The absorption according to any one of <1> to <27>, wherein a position where the free end portion is fixed is closer to the deformation guide portion than a central position between the edge and the deformation guide portion. Sex goods.
<29>
The absorbent article according to any one of <1> to <28>, wherein the absorbent core includes a pair of longitudinal deformation guide portions on both side portions along the longitudinal direction.
<30>
The absorbent article according to <29>, wherein the longitudinal direction deformation guide portion is provided at an inner position in the width direction X than the deformation guide portion.
<31>
The longitudinal direction deformation guiding portion is located between the first deformation guiding portion and the second deformation guiding portion, and is mainly present in the central region C according to <29> or <30>. Absorbent article.
<32>
The absorbent article according to any one of <29> to <31>, wherein the longitudinal deformation guide part forms a discontinuous region of a constituent material of the absorbent core.
<33>
The deformation induction part is composed of a notch formed in the absorbent core,
The notch is defined by an edge including a first notch edge located on a side near the edge and a second notch edge located on a side far from the edge;
In each deformation guiding portion, the longitudinal direction Y between the end portion P1 of the first notch edge portion located on the side edge and the end portion P2 of the second notch edge portion located on the side edge. Is the distance K1,
The other end portion P1 ′ positioned inward in the width direction from the end portion P1 of the first notch edge portion, and positioned inward in the width direction from the end portion P2 of the second notch edge portion. The absorbent article according to any one of <1> to <32>, wherein K2 is shorter than K1, where K2 is a distance in the longitudinal direction Y with respect to the other end P2 ′.

DESCRIPTION OF SYMBOLS 1 Incontinence pad 2 Top sheet 3 Back sheet 4 Absorbent core 5 Core wrap sheet 6 Longitudinal deformation guide part 7 Side flap 8 Three-dimensional leak-proof structure 8a Base end part 8b Free end part 8c Elastic member 9 Three-dimensional leak-proof structure forming sheet A Front area B Rear area C Central area C1 First notch edge C2 Second notch edge C3 Third notch edge N1 First deformation inducing part N2 Second deformation inducing parts S1, S2 Side edge T1 Front edge T2 Rear edge Q, Q1, Q2 Inner end of deformation guide

Claims (5)

In an absorbent article comprising a vertically long absorbent core defined by a pair of side edges extending in the longitudinal direction and a pair of edges extending in the width direction, and a pair of three-dimensional leak-proof structures extending in the longitudinal direction,
In the front region and the rear region in the longitudinal direction of the absorbent core, each provided with a pair of deformation guide portions that enter from the side edge toward the inner side in the width direction and the inner side in the longitudinal direction,
The three-dimensional leak-proof structure has a base end portion and a free end portion extending in the longitudinal direction, and the base end portion is on the absorbent core on the skin facing surface,
The position where the free end portion of the three-dimensional leak-proof structure is fixed in the longitudinal front and rear end regions of the three-dimensional leak-proof structure is between the end edge and the deformation guiding portion, and the side edge and the deformation An absorptive article located between the inner end in the width direction of the guide portion. The deformation induction part is composed of a notch formed in the absorbent core,
The notch is defined by an edge including a first notch edge located on a side near the edge and a second notch edge located on a side far from the edge;
A straight line that passes through the end P1 of the first notch edge located on the side edge and extends in the width direction is L1, and an end P2 of the second notch edge located on the side edge is defined as L1. 2. The absorptivity according to claim 1, wherein an inner end in the width direction of the deformation guiding portion is located outside a region defined by L <b> 1 and L <b> 2 when L <b> 2 is a straight line extending in the width direction. Goods.   The absorptivity according to claim 1 or 2, wherein each of the first and second cutout edges is a straight line, and the first cutout edge is longer than the second cutout edge. Goods.   The deformation guiding portion has the inner end at two locations, the first inner end is located outside the region defined by L1 and L2, and the second inner end is the region. The absorbent article according to claim 2, which is located inside.   The absorbent article according to any one of claims 1 to 4, wherein a position where the free end portion is fixed is closer to the deformation guide portion than a center position between the end edge and the deformation guide portion. .

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