JP5341738B2 - Absorbent articles - Google Patents

Absorbent articles Download PDF

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JP5341738B2
JP5341738B2 JP2009283598A JP2009283598A JP5341738B2 JP 5341738 B2 JP5341738 B2 JP 5341738B2 JP 2009283598 A JP2009283598 A JP 2009283598A JP 2009283598 A JP2009283598 A JP 2009283598A JP 5341738 B2 JP5341738 B2 JP 5341738B2
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groove
article
region
grooves
longitudinal direction
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JP2011125360A (en
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仁 月田
一光 古田
泰生 豊島
進介 長原
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花王株式会社
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  The present invention relates to an absorbent article that is used by being fixed to an undergarment such as a sanitary napkin, a panty liner (corimono sheet), or an incontinence pad. Hereinafter, a sanitary napkin includes a panty liner and an incontinence pad.

  Conventionally, in a sanitary napkin, a left side, a right side, a front side, and a rear side of a skin contact surface side of an absorbent layer, which includes a liquid-retaining absorbent body and a surface sheet disposed on the skin contact surface side of the absorbent body Some of them have curved embossed grooves spaced apart from each other. For example, in the absorbent article described in Patent Document 1, the excretory part region (the part of the resting article that is in contact with the body fluid excretion part of the wearer) on the skin contact surface side of the vertically long absorbent layer. A pair of left and right grooves that are curved convexly outward in the article width direction when viewed in plan are formed on both side portions along the longitudinal direction of the pair of left and right grooves. Then, a pair of side grooves that are curved inwardly in the width direction are formed along the first groove, and the front grooves and the rear grooves that are curved outwardly in the longitudinal direction on the front side and the rear side, respectively. Grooves are provided.

JP 2007-195665 A

  The absorbent article described in Patent Document 1, in particular, has room for improvement in the stability of the surface shape of the skin contact surface of the excretory part region at the time of wearing. May occur, and the adhesion with the excretion part of the wearer may be insufficient.

  Accordingly, an object of the present invention is to provide an absorbent article (a sanitary napkin) having high stability of the surface shape of the excretory part region at the time of wearing and excellent adhesion to the excretory part of the wearer.

  The present invention comprises a liquid-retaining absorbent body and a topsheet disposed on the skin contact surface side of the absorbent body, and is substantially vertically long and has an excretory part region that is in contact with the body fluid excretory part of the wearer. An absorbent article having a front region extending forward of the body fluid excretion part and a rear region extending rearward of the body fluid excretion part in the longitudinal direction, wherein the skin contact of the absorbent article A linear shape extending in the longitudinal direction of the article, wherein the surface sheet and the absorbent body are integrally recessed toward the non-skin contact surface side of the absorbent article in a region of the contact surface overlapping the absorbent body in plan view As the grooves, a pair of first grooves that are curved outwardly in the article width direction when viewed in plan are formed on both side portions of the excretion part region along the article longitudinal direction. And in the article width direction outward of each of the pair of first grooves, the article width direction outward in plan view. A pair of second grooves curved in a convex shape are formed along the first grooves, and the first grooves are formed on both sides of the front region and the rear region along the longitudinal direction of the article. And a pair of third grooves that are not connected to the second groove are formed, and the number of the grooves is the largest in the boundary regions between the excretory region, the front region, and the rear region, In the front region and the rear region, the portion near the boundary region is minimized, and the second groove is less curved than the first groove, and the second groove By providing an absorbent article in which the distance in the article width direction from the first groove increases toward the outside in the article longitudinal direction, the above problem is solved.

  According to the absorbent article (sanitary napkin) of the present invention, the stability of the surface shape of the excretory part region at the time of wearing is high and the adhesiveness with the excretory part of the wearer is excellent, so that leakage of body fluid is reduced. In addition, twisting hardly occurs and the absorbent body has excellent fit.

FIG. 1 is a plan view schematically showing a skin contact surface side (surface sheet side) of a sanitary napkin that is an embodiment of the absorbent article of the present invention. FIG. 2 is a cross-sectional view schematically showing a cross section taken along line II of FIG. 3A and 3B are diagrams for explaining deformation in the longitudinal direction of the article when the napkin shown in FIG. 1 is mounted. FIG. 3A is a schematic plan view at the time of deformation, and FIG. It is a typical side view. FIG. 4 is a diagram for explaining deformation in the article width direction when the napkin shown in FIG. 1 is attached, based on a cross section taken along line II of FIG. 1, and FIG. 4 (a) is a compressive force in the article width direction. FIG. 4B is a perspective view of a schematic cross section taken along line II when the compressive force is applied. FIG. 5 is a plan view showing the arrangement of grooves in the main part (boundary area) of another embodiment of the sanitary napkin of the present invention. FIG. 6 is a perspective view schematically showing a process of obtaining the individual package by folding the napkin shown in FIG. 1 together with the packaging material. FIG. 7 is a perspective view schematically showing one embodiment of a top sheet provided in the napkin shown in FIG. 1. FIG. 8 is an enlarged plan view schematically showing a part on the skin contact surface side of the top sheet shown in FIG.

  Hereinafter, the absorbent article of this invention is demonstrated with reference to drawings based on the sanitary napkin which is one preferable embodiment. As shown in FIG. 1, the napkin 1 according to the present embodiment includes a liquid-retaining absorbent body 4 and a surface sheet 2 disposed on the skin contact surface side of the absorbent body 4, and is substantially vertically long and mounted. The excretory part area | region A contact | abutted by a person's bodily fluid excretion part, the front area | region B extended ahead of this bodily fluid excretion part A, and the back area | region C extended behind this bodily fluid excretion part A are longitudinal direction. Y has. When the napkin 1 is worn, the front area B is arranged on the front (abdomen) side of the wearer and the rear area C is arranged on the rear (back) side of the wearer.

  In the present specification, the skin contact surface is a surface of the sanitary napkin or a component thereof facing the wearer's skin when the sanitary napkin is worn, and the non-skin contact surface is the sanitary napkin. Alternatively, the surface of the member is directed to the side opposite to the skin side (clothing side) when the sanitary napkin is attached. The longitudinal direction is a direction along the long side of the sanitary napkin or its constituent members, and the width direction is a direction orthogonal to the longitudinal direction. In the figure, the direction indicated by the symbol X is the article width direction, and the direction indicated by the symbol Y is the article longitudinal direction.

  More specifically, as shown in FIG. 2, the napkin 1 of the present embodiment includes a top sheet 2 that forms a skin contact surface of the napkin 1, a back sheet 3 that forms a non-skin contact surface of the napkin 1, and these The absorbent body 4 interposed between the two sheets 2 and 3 is provided, and has a long shape (substantially rectangular shape) in one direction in a plan view as shown in FIG. The top sheet 2 and the back sheet 3 have a size larger than that of the absorbent body 4, extend from the peripheral edge of the absorbent body 4, and are joined to each other by heat sealing or the like at the end portions of the extended sections. Forming. The top sheet 2 and the back sheet 3 may be bonded to the absorbent core 4 with an adhesive. The non-skin contact surface of the back sheet 3 is provided with an adhesive portion (not shown) that fixes the napkin 1 to clothes such as underwear. The pressure-sensitive adhesive portion is provided by applying a hot melt pressure-sensitive adhesive or the like at a predetermined location, and is covered with a release sheet (not shown) made of a film, nonwoven fabric, paper, or the like before the napkin 1 is used. .

  As shown in FIG.1 and FIG.2, in the area | region which overlaps with the absorber 4 in planar view of this napkin 1 in the skin contact surface (skin contact surface of the surface sheet 2) of the napkin 1, it is the surface sheet 2 and absorption. A linear groove 7 extending in the article longitudinal direction Y, in which the body 4 is integrally recessed toward the non-skin contact surface side (back surface sheet 3 side) of the napkin 1 is formed. Here, “linear” means that the shape of the groove (concave portion) is not limited to a straight line in a plan view, but includes a curved line, and each line may be a continuous line or a broken line. In the linear groove 7, the topsheet 2 and the absorber 4 are integrated by heat fusion or the like. The formation of the linear groove 7 is particularly effective for preventing diffusion of excretory fluid such as menstrual blood and improving adhesion to the body when worn. The linear groove 7 can be formed in accordance with an ordinary method by embossing such as embossing with or without heat, or ultrasonic embossing.

In the napkin 1 of this embodiment, the following grooves 1) to 4) are formed as linear grooves 7 extending in the longitudinal direction Y of the article. The following pair of first, second, and third grooves are arranged symmetrically across a virtual straight line (not shown) that bisects the napkin 1 in the article width direction X, respectively.
1) A pair of first grooves 71, 71 formed on both side portions along the article longitudinal direction Y of the excretory part region A and curved in a convex shape outward in the article width direction X in plan view.
2) A pair of second grooves 72 formed outwardly in the article width direction X of each of the pair of first grooves 71, 71 and curved in a convex shape outward in the article width direction X in plan view. 72.
3) A pair of front longitudinal grooves (third grooves) 73, 73 formed on both sides of the front region B along the article longitudinal direction Y and not connected to the first groove 71 and the second groove 72. .
4) A pair of rear longitudinal grooves (third grooves) 74, 74 formed on both sides of the rear region C along the article longitudinal direction Y and not connected to the first groove 71 and the second groove 72. .

  In addition to the linear groove 7 extending in the article longitudinal direction Y of 1) to 4) above, the article on the skin contact surface of the napkin 1 that overlaps the absorbent body 4 in plan view of the napkin 1 A linear groove 8 extending in the width direction X is formed. That is, in the front region B, the front width direction groove 81 that is convexly curved outward in the longitudinal direction Y of the article in a plan view has the convex top portion 81a aligned with the center of the napkin 1 in the article width direction X. Is formed. The front width direction groove 81 is connected to a pair of front longitudinal grooves 73 and 73 at both ends in the linear direction, and the whole of the grooves 73, 73, 81 is the article longitudinal direction Y in plan view. A substantially U-shape that is convex outward is formed. Further, in the rear region C, a rear width direction groove 82 that is curved outwardly in the longitudinal direction Y of the article in plan view is formed with the convex top portion 82a coinciding with the center of the article width direction X. ing. The rear width direction groove 82 is connected to a pair of rear longitudinal grooves 74, 74 at both ends in the linear direction, and the whole of the grooves 74, 74, 82 is the article longitudinal direction Y in plan view. A substantially U-shape that is convex outward is formed.

  As shown in FIG. 1, the first groove 71 extends over the entire length in the article longitudinal direction Y of the excretory part region A, and the convex top 71 a is located at the center of the article 71 in the article longitudinal direction Y. doing. Both end portions 71b and 71b in the linear direction of the first groove 71 (the direction in which the linear grooves extend) are the boundary region D between the excretory region A and the front region B, and the excretion region A and the rear region C. And the boundary area E. The boundary region D is a region straddling the boundary line P1 between the excretion part region A and the front region B in the article longitudinal direction Y, and is composed of the vicinity of the boundary line P1 of each of the excretion part region A and the front region B. The boundary region E is a region straddling the boundary line P2 between the excretory part region A and the rear region C in the article longitudinal direction Y, and is composed of portions near the boundary lines P2 of the excretion part region A and the rear region C. Usually, the boundary line P1 is located at a position 25 to 50 mm away from the virtual straight line Q toward the front area B when the virtual straight line Q that bisects the napkin 1 in the article longitudinal direction Y is drawn, and the boundary line P2 Is located at a position 25 to 50 mm away from the imaginary straight line Q toward the rear region C. The first groove 71 is arranged such that the virtual straight line Q passes through the convex top portion 71 a of the groove 71.

  As shown in FIG. 1, the second groove 72 extends over the entire length in the article longitudinal direction Y of the excretory part region A, and the convex top part 72 a is the center of the article 72 in the article longitudinal direction Y. The first groove 71 is located within the range of the length in the article longitudinal direction Y. Both ends 72b, 72b in the linear direction of the second groove 72 exist in the boundary region D and the boundary region E, respectively. Similar to the first groove 71, the second groove 72 is arranged so that the imaginary straight line Q passes through the convex top portion 72 a of the groove 72, and the convex top portion 71 a and the groove 72 of the groove 71 are arranged. Is the same position in the article longitudinal direction Y. The groove 71 and the groove 72 have substantially the same length in the article longitudinal direction Y. The second groove 72 is preferably disposed in a region within 20 mm from the side edge 4s along the article longitudinal direction Y of the absorbent body 4.

  The degree of curvature of the second groove 72 is smaller than that of the first groove 71. As shown in FIG. 1, the distance L1 between the groove 71 and the groove 72 in the article width direction X is equal to the article longitudinal direction. It increases as it goes to the outside of Y. The separation distance L1 is minimum at a portion (passage portion of the imaginary straight line Q) sandwiched between the convex top portion 71a of the groove 71 and the convex top portion 72a of the groove 72. It is the maximum in each of the boundary areas D and E where the ends 71b and 72b in the linear direction exist. Therefore, the first groove 71 and the second groove 72 do not extend in the same direction starting from the tops 71a and 72a. The degree of curvature of the grooves 71 and 72 can be evaluated by the magnitude of the radius of curvature at the center in the linear direction of each groove (intersection with the virtual straight line Q and the vicinity of the intersection). The second groove 72, which has a small degree of curvature in comparison with the first groove 71, has a radius of curvature larger than that of the first groove 71.

  The front longitudinal direction groove 73 and the rear longitudinal direction groove 74, which are the third grooves, are respectively curved in a convex shape outward in the article width direction X in plan view, as shown in FIG. One of both ends in the linear direction of the front longitudinal groove 73 is connected to the front width direction groove 81, and the other (indicated by reference numeral 73 b in the figure) exists in the boundary region D. Further, one of both ends in the linear direction of the rear longitudinal groove 74 is connected to the rear width direction groove 82, and the other (indicated by reference numeral 74 b in the figure) exists in the boundary region E. . Each of the grooves 73 and 74 is preferably disposed in a region within 30 mm from the side edge 4s along the article longitudinal direction Y of the absorbent body 4.

  The napkin 1 of the present embodiment is deformed along the wearer's body when worn, mainly due to the presence of the linear grooves 7 extending in the article longitudinal direction Y described above. It is difficult for wrinkles to occur on the contact surface, and the skin contact surface is in close contact with the excretory part of the wearer. Such deformation at the time of mounting the napkin 1 is mainly due to the following configurations i) and ii).

  i) Boundary regions D and E located in the front and back of the article longitudinal direction Y of the excretory part region A are high rigidity regions having the highest rigidity, respectively, and in the front region B and the rear region C, respectively. The portions near the boundary areas D and E are low rigidity areas having the lowest rigidity.

  ii) In the excretion part region A, a first groove 71 extending along the entire length of the article longitudinal direction Y and a second groove 72 extending along the groove 71 are formed, and the convex shape of the groove 72 Of the groove 71 is within the range of the length of the article 71 in the longitudinal direction of the article 71, and the distance L1 between the groove 71 and the groove 72 increases toward the outside in the longitudinal direction of the article Y. Yes.

  Regarding the configuration i), the rigidity distribution in the article longitudinal direction Y is made by controlling the number of linear grooves 7 extending in the article longitudinal direction Y. The groove 7 is a portion where the topsheet 2 and the absorber 4 are consolidated, and is harder and more rigid than the other portions. Therefore, the region where the number of the grooves 7 is relatively large is higher in rigidity than the region where the number of grooves 7 is relatively small. In particular, since the groove 7 is a groove extending in the article longitudinal direction Y, the article longitudinal direction It is difficult to bend Y (that is, it is difficult to bend along a folding line along the article width direction X).

  In the present embodiment, the number of grooves 7 (the number of grooves 7 on one side with the center in the body width direction X as a boundary) is the number of grooves 71 and 72 in the excretory region A as shown in FIG. In the total of two lines, the boundary areas D and E, respectively, a total of three grooves 71, 72 and 73, and in the front area B and the rear area C, there are one groove 73 or 74, respectively. The boundary areas D and E, the excretion area A, the front area B, and the rear area C are arranged in descending order of the number of the grooves 7. That is, the number of the grooves 7 is the largest in the boundary regions D and E, and the smallest in the portions near the boundary regions D and E in the front region B and the rear region C, respectively. Therefore, in the napkin 1 of the present embodiment, the order of rigidity (difficulty in bending in the article longitudinal direction Y) is also in this order, the boundary areas D and E are the high rigidity area, the front area B and the rear area C are It is a low-rigidity region, and the excretion part region A is a middle-rigid region having intermediate rigidity between them.

  Due to the distribution of rigidity caused by the linear grooves 7 in the article longitudinal direction Y as defined in i) above, in the napkin 1 of the present embodiment, the boundary areas D and E are unlikely to be flexible shafts. A front area A (low rigidity area) located outside the article longitudinal direction Y from the boundary area D and a rear area C (low rigidity area) located outside the article longitudinal direction Y from the boundary area E are mounted. It is easy to bend on the person's skin side, and the excretion part area A (medium rigidity area) sandwiched between the boundary areas D and E is not easily bent in the article longitudinal direction Y, and the stability of the surface shape is enhanced. It is hard for wrinkles to occur. Accordingly, when the napkin 1 is fixed to the crotch portion of the undergarment as usual and attached to the body, the napkin 1 has a boat-like shape that is easy to follow the body in a side view as shown in FIG. The excretory part area A of the shape is in close contact with the excretory part of the wearer.

  Moreover, the surface sheet 2 and the absorber 4 in the area | region T (refer FIG. 4A) pinched | interposed by the 1st groove | channel 71 and the 2nd groove | channel 72 by the structure of said ii) are the groove | channel 71,72. In the region CT (see FIG. 4A) between the pair of first grooves 71 and 71, the integration is reduced by the consolidation at the time of formation and the flexibility is lower than that of the other portions. The top sheet 2 and the absorbent body 4 are not consolidated and maintain flexibility. Therefore, when the napkin 1 of the present embodiment is worn, as shown in FIG. 4B, the compressive force F (for example, pressure when tightened by the wearer's thigh) toward the center in the article width direction X is applied. When acted, the side portion including the first groove 71, the second groove 72, and the region T is unlikely to become a flexible shaft, and only the region CT sandwiched between the pair of left and right side portions is the wearer's. Since it protrudes toward the excretion part, the adhesion between the excretion part region A and the excretion part is improved, and leakage of body fluid is reduced. Further, in the napkin 1 of the present embodiment, only the region CT is raised in the article width direction X, and the first groove 71, the second groove 72, and the region T, which are located on the left and right sides of the region CT, Since it is difficult to separate from the crotch portion of the underwear, twisting hardly occurs and the fit of the absorbent body is improved.

  In particular, since the separation distance L1 between the first groove 71 and the second groove 72 increases toward the outside in the article longitudinal direction Y, a distribution of rigidity is formed in the region T itself, Due to the distribution of rigidity in such a region T, the adhesion between the excretion region A and the excretion region of the wearer is further enhanced. That is, in the region T, the region T1 sandwiched between the convex top portion 71a of the groove 71 and the convex top portion 72a of the groove 72, in which the separation distance L1 is the minimum value, has the highest rigidity in the region T and is compressed. Since the region is difficult to be deformed by the force F, the portion sandwiched between the pair of left and right regions T1 and T1 in the region CT is likely to rise toward the excretory part of the wearer, whereas the separation distance L1 is the maximum. Since the region T2 located in the boundary regions D and E, which is the value, is the region of the region T that has the lowest rigidity and is easily deformable by the compression force F, the movement of the wearer's thigh (particularly the vertical movement) ), The deformation of the portion sandwiched between the pair of left and right regions T2 and T2 is alleviated. A stable surface shape of the excretion part region A is obtained by the action of the difficult deformation area T1 and the easy deformation area T2, and the generation of wrinkles on the skin contact surface of the excretion part area A is suppressed. Adhesiveness to the body of the person's excretory part directly increases, and stable wearing and absorptive expression are possible.

  However, in order to obtain the above-described effects by the configurations of i) and ii), as a precondition, double grooves formed on both side portions along the article longitudinal direction Y of the excretory region A are Like the 1st groove | channel 71 and the 2nd groove | channel 72 in embodiment, all need to be curving convexly outward in the article width direction in planar view. Without such a configuration, the boundary regions D and E are unlikely to be high-rigidity regions, and the above-described action due to the region T sandwiched between the double grooves is also difficult to be performed. The stable surface shape of the partial region A cannot be obtained, and improvement in fit and prevention of body fluid leakage cannot be expected.

  For example, in the absorbent article described in Patent Document 1, a pair of left grooves in which double grooves formed on both sides of the excretory part-facing part are curved in a convex shape outward in the article width direction in plan view. Or a right groove and a side groove that is located outward in the width direction of the left groove or the right groove and is curved in a convex shape inward in the width direction in plan view, and the left groove (right groove) When the convex top of the side groove and the convex top of the side groove face each other, the absorbent article described in Patent Document 1 is wrinkled on the skin contact surface of the excretory region A when worn. There is room for improvement in terms of obtaining a stable surface shape. The reason is not clear, but in the absorbent article described in Patent Document 1, excretion occurs because the convex top of the left groove (right groove) and the convex top of the side groove face each other. The interval between the left groove (right groove) and the side groove in the boundary region between the partial region, the front region, and the rear region is excessively widened. As a result, the above-described “line extending in the article longitudinal direction in the article longitudinal direction” This is presumably due to the fact that the “distribution of rigidity due to the groove-like” is not formed.

  In the napkin 1 of the present embodiment, as shown in FIG. 1, the pair of first grooves 71 and 71 are separated from each other and are not connected in plan view. , 71 is easy to raise the region CT (see FIG. 4A). A configuration in which the pair of first grooves 71 and 71 are connected and closed in a plan view (forms a circumferential groove) is not preferable because the region CT hardly rises. From the viewpoint of facilitating the rise of the region CT, the distance L2 (see FIG. 1) between the end portions 71b of the pair of first grooves 71 and 71 in the linear direction is preferably 5 to 50 mm, and more preferably 10 ~ 30 mm.

  Moreover, in the napkin 1 of this embodiment, as shown in FIG. 1, the edge part 71b of the 1st groove | channel 71, the edge part 72b of the 2nd groove | channel 72, and the 3rd groove | channel are each in the boundary areas D and E. 73 exists, and the end 73 is located between the end 71b and the end 72b. That is, in the boundary areas D and E, the first groove 71, the third groove 73, and the second groove 72 are arranged in this order from the center in the article width direction X of the napkin 1 outward. The direction ends are lined up. When the end portions in the linear direction of the linear grooves 7 are arranged in this way in the boundary areas D and E, it is easy to obtain the above-described effects by the configurations i) and ii). Since the flexibility of the region T2 is improved and the flexible deformation with respect to the movement of the thigh of the wearer in the region T2 is further facilitated, a stable surface shape of the excretory region A is easily obtained.

  In addition, the arrangement | positioning form of each groove | channel 7 in the boundary areas D and E is not limited to embodiment shown in FIG. 1, It can set suitably, for example, can also be carried out like embodiment shown in FIG. FIG. 5 shows a modification of the portion where the ends of the grooves in the left portion of the boundary area D gather in FIG. 1, but in the embodiment shown in FIG. Further, both side portions of the boundary area E are configured in the same manner as in FIG. In the embodiment shown in FIG. 5, an end 71b of the first groove 71 and an end 73b of the third groove 73 exist in each of the boundary areas D and E, and the end 73b is an end. It is located inward in the article width direction X from 71b. The second groove 72 reaches the front region B (rear region C) beyond the boundary region D (boundary region E), and the end 72b is not located in the boundary region D (boundary region E). . In the embodiment shown in FIG. 5, the flexibility of the region T2 described above is particularly improved by the arrangement form of the ends of the groove, and the region T2 corresponds to the movement of the thigh of the wearer. The embodiment shown in FIG. 1 is not inferior to the embodiment shown in FIG. However, in order to appropriately control the raised shape when the excretory part region A (region CT) is mounted, as shown in FIG. 1, the end part 71b of the first groove 71 is the most in the boundary regions D and E. In the embodiment shown in FIG. 5, the end portion 73 b of the third groove 73 is most inward in the article width direction X in the embodiment shown in FIG. Because of the location, the embodiment shown in FIG. 1 is preferred overall.

From the viewpoint of ensuring the above-described effects of the napkin 1 according to the present embodiment, the dimensions and the like of each part are preferably set as follows.
The curvature radius of the first groove 71 (the intersection with the virtual straight line Q and the curvature radius in the vicinity of the intersection) is preferably 30 to 200 mm, more preferably 50 to 150 mm.
Further, the radius of curvature of the second groove 72 (the intersection with the virtual straight line Q and the curvature radius in the vicinity of the intersection) is preferably 50 to 500 mm, and more preferably 100 to 450 mm.
The ratio of the radius of curvature of the groove 71 to the radius of curvature of the groove 72 (groove 71 / groove 72) is preferably 0.30 to 0.80, and more preferably 0.35 to 0.75.
Further, the first groove 71 may be constituted by a plurality of curves having different curvature radii. In this case, if the curvature radius of the curve is derived from three points passing through both ends and the center of the groove. good. The curved line preferably has a center of curvature on the same side with the groove 71 as a boundary, but in a combination of curvature radii that is sufficiently smaller than the groove 71 (such as a wave shape), the curve may not be on the same side.

The minimum value of the separation distance L1 (the length in the article width direction X of the portion sandwiched between the convex top portion 71a of the groove 71 and the convex top portion 72a of the groove 72) is preferably 2 to 11 mm, more preferably 3 to 10 mm.
Further, the maximum value of the separation distance L1 (the separation distance between the groove 71 and the groove 72 in each of the boundary areas D and E) is preferably 5 to 25 mm, and more preferably 10 to 20 mm.

Further, the length (L71) of the first groove 71 in the article longitudinal direction Y is preferably 50 to 100 mm, and more preferably 60 to 80 mm.
Further, the length (L72) of the second groove 72 in the article longitudinal direction Y is preferably 50 to 100 mm, and more preferably 60 to 80 mm.
The ratio of the length L71 to the length L72 (L71 / L72) is preferably 0.75 to 1.35, more preferably 0.80 to 1.25.
Moreover, the width | variety (length of the direction orthogonal to a linear direction) of the grooves 71 and 72 becomes like this. Preferably it is 1-4 mm, More preferably, it is 1-2 mm.

A virtual straight line (not shown) extending in the linear direction toward the inside of the article longitudinal direction Y from the linear end 73b of the front longitudinal groove 73 and the linear end 74b of the rear longitudinal groove 74, respectively. The angle formed between each imaginary straight line and the first groove 71 is preferably 60 to 170 °, more preferably 90 to 150 °.
The lengths of the grooves 73 and 74 in the article longitudinal direction Y are each preferably 50 to 100 mm, and more preferably 40 to 80 mm. Further, the width of the grooves 73 and 74 (the length in the direction orthogonal to the linear direction) can be set similarly to the width of the grooves 71 and 72.

  The napkin 1 of this embodiment is folded with a packaging material, individually packaged (individually packaged), and marketed as an individual package, in the same manner as a normal sanitary napkin of this type. FIG. 6 shows a process of obtaining the individual package 15 of the napkin 1. The packaging material 10 is a sheet that forms the outer surface of the individual package 15, has a rectangular shape in plan view, is larger than the napkin 1, and when the napkin 1 is placed in the center of the napkin 1, The packaging material 10 extends from the periphery. The packaging material 10 can be peeled off from the napkin 1 via the adhesive portion (not shown) provided at a predetermined location on the non-skin contact surface of the napkin 1 (non-skin contact surface of the back sheet 3). It is sticky. As the packaging material 10, a resin film, a nonwoven fabric, paper, or the like can be used.

  To obtain the individual package 15, as shown in FIG. 6, first, the rear region C of the napkin 1 to which the packaging material 10 is adhered is excreted together with the packaging material 10 along the folding line S1 extending in the article width direction X. Folded to the skin contact surface side of the part area A, and then folded the front area B along the folding line S2 extending in the article width direction X together with the packaging material 10 to the skin contact surface side of the excretory part area A. A known tab tape 11 is fastened over the folded back region C. If necessary, both side edges of the packaging material 10 extending outward in the width direction from both side edges of the folded napkin 1 are sealed by a known joining method such as embossing. In this way, the napkin 1 is folded in the longitudinal direction together with the packaging material 10 to form an individual package 15. In addition, as a method for obtaining the individual package 15 (folding method of the napkin 1), on the contrary, first, the front area B is folded back to the skin contact surface side of the excretion area A, and then the rear area C is set. A method of folding the excretion area A to the skin contact surface side and overlapping the front area B that has already been folded may be used.

  In the individual package 15, the napkin 1 is positioned in the article longitudinal direction along folding lines S 1 and S 2 that are located outward of the article longitudinal direction Y from the end 71 b of the first groove 71 and extend in the article width direction X. Folded to Y. The folding lines S1 and S2 particularly preferably cross the front region B or the rear region C in the article width direction X, which is located outside the boundary regions D and E in the article longitudinal direction Y. As described above, the outer side in the article longitudinal direction Y than the end 71b of the first groove 71 is a low-rigidity region having the lowest rigidity, and the napkin 1 is placed in the article longitudinal direction in the low-rigidity region. By bending to Y, the bending becomes easy and wrinkles due to the bending are less likely to occur.

  When the formation material of each part in the napkin 1 of this embodiment is demonstrated, as the surface sheet 2 and the back surface sheet 3, various things conventionally used in the said technical field can be especially used without a restriction | limiting. As the top sheet 2, a hydrophilic and liquid permeable nonwoven fabric, an apertured film, a laminate thereof, or the like can be used. As the back sheet 3, a liquid impermeable or water repellent resin film or resin film can be used. A laminate of non-woven fabric and the like can be used.

  As a material constituting the absorbent body 4, various materials conventionally used in the technical field can be used without particular limitation, for example, a fiber assembly made of hydrophilic fibers such as wood pulp and synthetic fiber, or A fiber assembly in which particulate superabsorbent resin is held can be used. The absorbent body 4 includes a liquid-retaining absorbent core (not shown) made of the fiber assembly and the like, and a liquid-permeable core wrap sheet (not shown) that covers the absorbent core. In this case, the absorbent core and the core wrap sheet may be joined to each other by a joining means such as a hot-melt pressure-sensitive adhesive at a predetermined site. As a core wrap sheet which coat | covers an absorptive core, paper, such as tissue paper, various nonwoven fabrics, an apertured film, etc. can be used, for example.

  The napkin 1 of the present embodiment is used by being attached to an undergarment in the same manner as a known sanitary napkin. The napkin 1 of the present embodiment is mainly used for the skin of the excretory region A by the action of the linear grooves 7 (the first groove 71, the second groove 72, and the third groove 73) extending in the article longitudinal direction Y. It is difficult for wrinkles to occur on the contact surface, and the skin contact surface is in close contact with the excretion part of the wearer in a state where the surface shape is stable, so that leakage of bodily fluids is reduced and twisting is difficult to occur. The fit of the absorber is improved.

  By the way, the characteristic deformation when the napkin 1 of the present embodiment is mounted is largely due to the action of the groove 7 extending in the longitudinal direction Y of the article, but can be controlled to some extent by the topsheet 2. That is, when the topsheet 2 is a sheet that is difficult to extend in the article width direction X, the topsheet 2 and the absorber 4 in the region T sandwiched between the first groove 71 and the outer groove 72 are formed in the grooves 71 and 72. It is easier to integrate by compaction at the time of formation. Therefore, the first groove 71, the second groove 72, and the region T are less likely to be a flexible shaft, and the above-described region CT is more easily raised on the skin side, and is closely attached to the excretory part of the wearer. The performance is further improved and body fluid leakage is reduced.

  Specifically, the top sheet that is difficult to extend in the article width direction X is a top sheet having a tensile strength of 150 cN or more, particularly 200 to 400 cN when 10% of the article width direction X is elongated. The tensile strength is measured as follows.

<Measurement method of tensile strength at 10% elongation>
Tensilon tensile tester (manufactured by A & D Co., Ltd., RTC) with reference to A method (strip method) defined in JIS L1096 (general fabric test method) in a test room at a temperature of 23 ° C. and a humidity of 50% -1210A), the tensile strength at 10% elongation of the test piece (surface sheet) is measured. The distance between the upper and lower chucks of the Tensilon tensile tester is adjusted to 100 mm, and the test piece is sandwiched between the upper and lower chucks so that the tensile strength measurement direction (article width direction) matches the vertical direction of the chuck. In a fixed state, the upper chuck is raised at a constant speed of 300 mm / min to increase the distance between the upper and lower chucks, and the strength when the test piece is extended by 10% is measured. The measurement was performed 5 times, and the average value was calculated as the tensile strength at 10% elongation in the measurement direction. In addition, about the test piece, what was cut | disconnected to length 200mm and width 50mm was made into the test piece especially the test piece which did not pre-dry and left at room temperature.

  In this embodiment, what is demonstrated below is used as the surface sheet 2 which is hard to extend in the article width direction X. That is, as shown in FIG. 7, the surface sheet 2 according to the present embodiment has a linear concave portion 20 formed by pressure-bonding or bonding the constituent fibers of the surface sheet 2 on the skin contact surface 2 a side. A large number are formed, and the linear recesses 20 are continuous at least in the article width direction X. Moreover, the linear recessed part 20 is formed in the grid | lattice form, The surface sheet 2 is divided into many area | regions 22 by this linear recessed part 20, and the division area | region is formed.

  In the topsheet 2, the linear recess 20 is continuous at least in the article width direction X. Here, “continuous in the article width direction” may be a direction that intersects the article longitudinal direction Y with respect to the extending direction of the linear recess 20 (that is, the article longitudinal direction Y and Except for parallel directions). “Linear” means that the shape of the recess 20 is not limited to a straight line as shown in FIG. 7 in a plan view, but includes a curve, and each line may be a continuous line, or a rectangle, square, rhombus, or circle in a plan view. In addition, a large number of hollow portions (embossed portions) such as a cross may be connected to form a continuous line as a whole.

  The topsheet 2 is made of a single layer non-woven fabric (three-dimensionally shaped non-woven fabric), and its one surface 2a has a concavo-convex shape having a large number of concave portions 20 and convex portions 23, and the other surface 2b is substantially flat. . The one surface 2 a is a surface that forms the skin contact surface of the napkin 1. The convex part 23 is located between the concave parts 20. The inside of the convex part 23 is filled with the constituent fibers of the topsheet 20.

  The linear recess 20 is formed by pressing or bonding constituent fibers. Here, examples of means for crimping the fiber include embossing and ultrasonic embossing with or without heat. On the other hand, as means for adhering fibers, bonding with hot melt or various adhesives can be mentioned. The linear recess 20 in the topsheet 2 according to the present embodiment is formed by subjecting a fiber web formed by a card method to hot embossing. In the linear recessed part 20, the heat-fusible fiber which is the constituent fiber of the surface sheet 2 or the nonwoven fabric which comprises it is integrated by heat sealing | fusion. In the heat-fusible fiber in the linear recess 20, the heat-fusible component melts and the form of the fiber is not maintained.

  Thus, since the surface sheet 2 is formed with a large number of linear concave portions 20 that are continuous in the article width direction X, the surface sheet 2 can be pulled in the article width direction X even if it is pulled in the width direction X. It is difficult to extend. In particular, in the present embodiment, as shown in FIG. 7, the linear concave portion 20 is continuous not only in the article width direction X but also in the article longitudinal direction Y. Even if pulled in the direction Y, it is difficult to extend in the longitudinal direction Y. That is, the top sheet 2 is difficult to extend in both the article width direction X and the longitudinal direction Y. Here, “continuous in the longitudinal direction of the article” may be a direction that intersects the article width direction X with respect to the extending direction of the linear recess 20 (that is, the article width direction X and Except for parallel directions).

  Many linear recessed parts 20 are formed in the grid | lattice form, as shown in FIG. More specifically, as shown in FIG. 8, the topsheet 2 is parallel to each other with a plurality of first linear recesses 20 a formed in parallel as a linear recess 20 at a predetermined interval. And a plurality of second linear recesses 20b formed at predetermined intervals, and the first linear recesses 20a and the second linear recesses 20b intersect each other at an angle α. doing. Thus, when many linear recessed parts 20 are formed in a grid | lattice form, the difficulty of extending the surface sheet 2 in the article width direction X is further enhanced. Further, in the portion surrounded by the linear recess 20, there is little change in the thickness of the surface sheet, and the initial performance is easily obtained. The width W1 of the first linear recess 20a and the width of the second linear recess 20b are the same, and the interval W2 between the first linear recesses 20a and the interval between the second linear recesses 20b are also the same. The same.

  The width W1 (only one is shown) of the first and second linear recesses 20a and 20b is 0.1 to 1.5 mm, particularly 0.3 to 0, in order to securely fix the fibers in the linear embossing. It is preferable that the distance W2 between the first linear recesses 20a and the interval between the second linear recesses 20b are 2 to 14 mm, particularly 2 to 8 mm. W1 and W2 are measured in a direction orthogonal to the line. The width of the line may change from the intersection, but W1 is measured at the intersection and the midpoint of the intersection. W2 is measured by a line connecting opposite sides of the partition area 22 described later.

  Thus, the surface sheet 2 has a large number of linear recesses 20 formed in a lattice pattern, and the surface recess 2 is partitioned into a plurality of regions by the linear recesses 20, and the partitioned regions 22, 22. -Is formed. Each partition region 22 is a region surrounded by a linear recess 20 and has a rhombus shape in plan view. The central portion of each partition region 22 is raised relative to the concave portion 20 surrounding the partition region 22 to form a convex portion 23. The ratio (D1 / D2) of the diagonal line D1 (diagonal line extending in the napkin width direction Y) and D2 (diagonal line extending in the napkin longitudinal direction X) of the rhombic partition region 22 is 0.2 to 3.0, particularly 0.3. It is preferable that it is -1.7.

The area of each partition region 22 is preferably 0.25 to 2 cm 2 . Moreover, it is preferable that the area ratio of the linear recessed part 20 is 16% or less, especially 14% or less from a liquid becoming difficult to remain in the surface sheet 2. If the area ratio of the concave portion 20 is too high, the convex portion 23 of the sheet is pressed down and the liquid tends to remain in the topsheet 2. Further, the area ratio of the recess 20 is preferably 10% or more, particularly 11% or more from the viewpoint of improving the liquid suction property. If the area ratio of the concave portion 20 is too low, the width of the linear concave portion 20 becomes narrow and the embossing strength of the portion cannot be secured, so that the liquid sucking property is deteriorated. The area ratio of the recess 20 can be obtained by image analysis of an actual photograph. At this time, if there is a fiber defect in the recess 20, manual correction is performed, and measurement is performed assuming that there is a fiber.

As the constituent fiber of the surface sheet 2, a heat-extensible fiber whose length is extended by heating is preferably used. The surface sheet 2 containing the heat-extensible fibers can be manufactured by forming a linear recess 20 on a web containing the heat-extensible fibers according to a conventional method, and then heat-treating it. As the surface sheet 2, for example, a sheet containing heat-extensible fibers described in Japanese Patent Application No. 2009-239846 according to the previous application of the present applicant can be used. The basis weight of the surface sheet 2 is preferably 18 to 60 g / m 2 , more preferably 25 to 40 g / m 2 .

  The surface sheet according to the present invention is not limited to the form shown in FIG. 7 and can be appropriately changed without departing from the gist of the present invention. For example, the shape of the partition region 22 in plan view is not limited to a rhombus as shown in FIG. 7, and may be an arbitrary shape such as a rectangle, a square, a parallelogram, an ellipse, or a triangle. In addition, a plurality of types of partition regions having different shapes in plan view can be provided on one surface sheet, for example, by combining diamond-shaped partition regions and parallelogram-shaped partition regions. However, the linear recessed part 20 surrounding the partition area 22 needs to be continuous in the article width direction X.

  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, a sanitary napkin is given as one example of application of the absorbent article of the present invention. However, the sanitary napkin is applicable to, for example, disposable diapers, panty liners (orimono sheets), incontinence pads, and the like.

1 Sanitary napkin (absorbent article)
2 Top sheet 3 Back sheet 4 Absorbent body 7 Linear groove 8 extending in the longitudinal direction of the article Linear groove 10 extending in the width direction X of the packaging 15 Packaging material 15 Individual body 71 First groove 71b End of the first groove 72 Second groove 72b Second groove end 73, 74 Third groove 73b, 74b Third groove end 81 Front width direction groove 82 Rear width direction groove A Excretion part area B Front area C Rear area D Boundary area between the excretion part area and the front area E Boundary areas P1, P2 between the excretion part area and the rear area Boundary lines S1, S2 Folding line X Article width direction Y Article longitudinal direction

Claims (5)

  1. An excretory part region comprising a liquid-retaining absorbent body and a surface sheet disposed on the skin contact surface side of the absorbent body, substantially vertically long and in contact with the body fluid excretion part of the wearer; An absorbent article having a front region extending in front of the part and a rear region extending rearward of the body fluid excretion part in the longitudinal direction,
    In the area of the skin contact surface of the absorbent article that overlaps the absorbent body in plan view, the topsheet and the absorbent body are integrally recessed toward the non-skin contact surface side of the absorbent article. A linear groove extending in the longitudinal direction of the article is formed,
    As the grooves, a pair of first grooves that are curved outwardly in the article width direction in a plan view are formed on both side portions of the excretion part region along the article longitudinal direction, and a pair of the first grooves are formed. A pair of second grooves that are curved outwardly in the article width direction in a plan view are formed along the first grooves outwardly in the article width direction of each of the first grooves, and A pair of third grooves that are not connected to the first groove and the second groove are formed on both sides of the front region and the rear region along the longitudinal direction of the article,
    The number of the grooves is the largest in the boundary area between the excretory part area and the front area and the rear area, respectively, and is the smallest in the part near the boundary area in the front area and the rear area,
    The second groove is less curved than the first groove, and the separation distance in the article width direction between the second groove and the first groove is outward in the article longitudinal direction. Absorbent articles increasing as you head.
  2.   In the boundary area, there are ends of the first groove, the second groove, and the third groove, and the end of the third groove is the end of the first groove. The absorptive article according to claim 1 located between a section and an end of the 2nd slot.
  3.   In the boundary region, there are ends of the first groove and the third groove, respectively, and the end of the third groove is more in the article width direction than the end of the first groove. The absorbent article according to claim 1, which is located inward.
  4.   The absorptive article according to any one of claims 1 to 3 whose tensile strength at the time of 10% extension of the surface sheet of the article width direction is 150 cN or more.
  5. The absorbent article according to any one of claims 1 to 4, wherein the absorbent article is folded together with a packaging material.
    The absorbent article is a piece of absorbent article that is folded in the longitudinal direction of the article along a folding line that is located outward in the longitudinal direction of the article from the end of the first groove and extends in the width direction of the article. Body.
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