JP6646441B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article such as a sanitary napkin.

  Conventionally, in an absorbent article having a long vertical length along the front-rear direction of the wearer, such as a sanitary napkin for use at bedtime, if there is a gap with the wearer's skin, In some cases, the liquid flows along the surface of the skin, leading to liquid leakage.

  Therefore, the present applicant proposes an absorbent article having improved fit to the body by forming a thick middle and high part in the absorbent body of the absorbent article and forming a raised part on the skin-facing surface. (For example, Patent Document 1).

  In addition, the present applicant has proposed an absorbent body for an absorbent article in which a groove-shaped concave portion serving as a base point of bending is formed in an absorbent core to improve fit to a body (for example, Patent Document 2). .

  In addition, as another technique, for example, in Patent Document 3, a long convex region is formed that is bent so that the central portion in the width direction of the front side sheet becomes a vertex toward the body side, and as a whole, An interlabial pad that is boat-shaped is described.

JP 2015-97716 A JP 2012-143535 A WO2002 / 094145

  In the absorbent article described in Patent Literature 1, the raised mid-high portion may be bent due to the compressive force from both legs in the width direction in the sleeping posture, which may also lead to liquid leakage, and further improvement. There was room for

  In the absorbent article for an absorbent article described in Patent Literature 2, since a thick middle and high portion is not provided partially, the absorbent body is compressed by a compressive force from both legs inward in the width direction in a sleeping posture. However, it is easy to bend and it is difficult to prevent liquid leakage, and there is room for further improvement.

  Further, the absorbent article described in Patent Document 3 is an interlabial pad, which is very small as compared with a sanitary napkin. The absorbent tends to bend due to the compressive force toward, and liquid leakage cannot be prevented. In addition, since the middle and high portions having a large thickness are not provided partially, the absorbent article is easily bent by the compressive force from the legs in the width direction toward the inside in the sleeping posture, and it is not possible to prevent liquid leakage.

  Therefore, an object of the present invention is to provide an absorbent article that can solve the above-mentioned disadvantages of the related art.

  The present invention includes an absorbent core having a longitudinally long shape corresponding to the front-rear direction of the wearer, an excretion part opposing portion disposed to face the liquid excretion part of the wearer, and disposed in front of the excretion part opposing portion. An absorbent article having a front portion and a rear portion disposed rearward of the excretory portion facing portion, wherein the absorbent core is provided at a central portion of the excretory portion facing portion in a horizontal direction orthogonal to a vertical direction. A middle-high region, wherein the middle-high region has a thickness greater than a thickness of a peripheral region of the middle-high region in the absorbent core, and is formed to have a basis weight higher than a basis weight of the peripheral region; The core has a groove portion having a thickness smaller than the thickness of the peripheral region and having a basis weight lower than the basis weight of the peripheral region, and the groove portion surrounds the middle and high region and defines the middle and high region and the peripheral region. A middle-high full-peripheral groove portion to be divided, and a vertical A pair of front grooves extending from the ends toward the front sides of both sides along the longitudinal direction of the absorbent core, and a longitudinal rear end of the middle and high circumferential groove along the longitudinal direction of the absorbent core. It is an object of the present invention to provide an absorbent article having a pair of rear grooves extending toward the rear side of both sides.

  ADVANTAGE OF THE INVENTION According to this invention, by the compressive force which inwardly in the width direction from both legs in a sleeping posture, a raised middle and high part is hard to bend, a fit to the body can be maintained, and liquid leakage hardly occurs.

FIG. 1 is a perspective view showing a worn state of a sanitary napkin which is a preferred first embodiment of the absorbent article of the present invention. FIG. 2 is a plan view showing the skin facing surface side (top sheet side) of the sanitary napkin shown in FIG. FIG. 3 is a sectional view schematically showing a section taken along line III-III of FIG. FIG. 4 is a plan view of the absorbent core included in the sanitary napkin shown in FIG. 1 on the skin facing surface side. FIG. 5 is a sectional view schematically showing a section taken along line VV of FIG. FIG. 6 is a sectional view schematically showing a section taken along line VI-VI of FIG. 7 (a) and 7 (b) are explanatory views for explaining a manufacturing process of the absorbent core provided in the sanitary napkin shown in FIG. FIG. 8 is a plan view of the absorbent core provided in the sanitary napkin according to the second preferred embodiment of the absorbent article of the present invention on the side facing the skin (equivalent to FIG. 4). FIG. 9 is a plan view showing a skin facing surface side (top sheet side) of a sanitary napkin which is a preferred second embodiment of the absorbent article of the present invention (corresponding to FIG. 2).

  Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings. The sanitary napkin 1A (hereinafter, also simply referred to as napkin 1A) as the first embodiment of the absorbent article of the present invention is a night napkin particularly suitable for use at bedtime. The napkin 1A preferably has a total length of 30 cm or more. The napkin 1A includes an absorbent core 41 having a shape that is long in the longitudinal direction X corresponding to the front-rear direction of the wearer, and is configured such that the excretion portion facing portion B is disposed to face the liquid excretion portion of the wearer. It has a front part A arranged forward and a rear part C arranged rearward from the excretion part facing part B.

  In this specification, the longitudinal direction X corresponds to the longitudinal direction of the absorbent article (napkin 1A), and the lateral direction Y corresponds to the width direction (the direction orthogonal to the longitudinal direction) of the absorbent article (napkin 1A). ing. The napkin 1A is formed symmetrically with respect to a center line CL extending in the vertical direction X. The vertical direction X is also a direction parallel to the center line CL. In this specification, the skin-facing surface is a surface of the absorbent article (napkin 1A) or a component thereof, which faces the wearer's skin when the absorbent article (napkin 1A) is worn, and is a non-skin facing surface. The surface is a surface of the absorbent article (napkin 1A) or a component thereof, which is directed to the side opposite to the skin side (clothing side) when the absorbent article (napkin 1A) is worn.

  The napkin 1A is disposed at a position facing the excretion part B facing the liquid excretion part (eg, vaginal opening) of the wearer when worn, and closer to the abdomen (front side) of the wearer than the excretion part opposition part B. It has a front part A and a rear part C arranged closer to the back (rear side) of the wearer than the excretion part facing part B. That is, the napkin 1A is divided in the longitudinal direction X in the order of the front part A, the excretion part facing part B, and the rear part C.

  In the absorbent article of the present invention, the excretion part facing part B is an absorbent article having no wing part, such as the napkin 1A of the present embodiment, in which the absorbent article is folded in three. With respect to two fold curves (not shown) that traverse the absorbent article in the horizontal direction Y, which are generated when the absorbent article is folded, the first fold curve and the first fold curve are counted from the front end in the longitudinal direction X of the absorbent article. It means a region surrounded by a bi-fold curve. When the absorbent article has a wing part, the excretion part opposing part B is a region having a wing part in the longitudinal direction X of the absorbent article (the base along the longitudinal direction X of one wing part and the other part). (A region between the wing portion and the base along the longitudinal direction X).

  As shown in FIGS. 1 and 2, the napkin 1A of this embodiment has a liquid-permeable top sheet 2 forming a skin-facing surface, a back sheet 3 forming a non-skin-facing surface, and both sheets 2, 3. It has an absorber 4 interposed therebetween.

  In the napkin 1A, as shown in FIGS. 2 and 3, the topsheet 2 covers the entire area of the skin facing surface of the absorber 4 and extends outward from both ends of the absorber 4 in the vertical direction X in the vertical direction X. At the same time, it extends outward in the horizontal direction Y from both side edges along the vertical direction X of the absorber 4. On the other hand, the back sheet 3 covers the entire area of the non-skin-facing surface of the absorber 4, extends outward from both ends in the vertical direction X of the absorber 4 in the vertical direction X, and extends in the vertical direction X of the absorber 4. , And extends outward in the lateral direction Y from both side edges. The top sheet 2 and the back sheet 3 are joined to each other at a portion extending from the entire periphery of the absorber 4 by a known joining means such as an adhesive, a heat seal, and an ultrasonic seal. It should be noted that a pair of side sheets or a pair of leak-preventing cuffs can be arranged on the left and right sides along the vertical direction X on the skin facing surface of the top sheet 2.

  In the napkin 1A, as shown in FIG. 3, the absorber 4 includes an absorbent core 41 having a water-absorbing polymer and a core wrap sheet 42 surrounding the absorbent core 41. The absorbent core 41 is formed by holding a water-absorbing polymer in a fiber aggregate made of a fiber material such as pulp fiber. The upper and lower surfaces of the absorbent core 41 are covered with a core wrap sheet 42 made of tissue paper or a water-permeable nonwoven fabric. The core wrap sheet 42 is used for the purpose of preventing the material forming the absorbent core 41 from leaking out and improving the shape retention of the absorbent core 41. Between the core wrap sheet 42 and the top sheet 2 covering the skin-facing surface side of the absorbent core 41 and between the core wrap sheet 42 and the back sheet 3 covering the non-skin facing surface side of the absorbent core 41. , Dots, spirals, stripes, etc., are preferably joined to each other by an adhesive coated with the pattern.

  In the napkin 1A, as shown in FIGS. 2 to 4, the absorbent core 41 has a middle and high area 43 in the central part in the lateral direction Y orthogonal to the vertical direction X in the excretion part facing part B. In the napkin 1A, the absorbent core 41 has a shape that is long in the same direction as the longitudinal direction X of the napkin 1A. Therefore, the longitudinal direction of the absorbent core 41 is the same direction as the longitudinal direction X of the napkin 1A, and the lateral direction of the absorbent core 41 is the same direction as the lateral direction Y of the napkin 1A.

  In the napkin 1A, as shown in FIGS. 4 to 6, the middle and high region 43 is thicker than the thickness of the peripheral region 44 of the middle and high region 43 in the absorbent core 41, and is smaller than the basis weight of the peripheral region 44. The amount is formed high. In the napkin 1A, the middle and high regions 43 are arranged in the central portion in the lateral direction Y, and are arranged in a belt shape over the entire excretion portion facing portion B. In the napkin 1A, as shown in FIG. 4, the front and rear end portions of the middle and high region 43 in the longitudinal direction X are respectively recessed inward when the absorbent core 41 is viewed in plan.

  In the napkin 1A, the peripheral region 44 is an annular region surrounding the middle and high region 43, and is arranged from the front part A to the rear part C. The thickness and basis weight of the middle and high region 43 mean the thickness and basis weight of a portion of the middle and high region 43 where no later-described middle and high groove portions 431 exist. The thickness and basis weight of the peripheral region 44 of the absorbent core 41 to be compared with the thickness and basis weight of the middle and high region 43 are the thickness and basis weight of a portion of the peripheral region 44 of the absorbent core 41 where a groove 45 described below does not exist. Means

  In the napkin 1A, the thickness of the middle and high regions 43 is such that a raised portion 11 (see FIG. 1) protruding toward the skin is formed on the skin-facing surface of the napkin 1A to improve the liquid absorbency and the like in the excretion-facing portion B. In view of this, the thickness of the peripheral region 44 of the absorbent core 41 is preferably 110% or more, more preferably 130% or more, still more preferably 150% or more, and preferably 2000% or less, more preferably 1000% or less. % Or less, more preferably 600% or less, specifically, preferably 110% or more and 2000% or less, more preferably 130% or more and 1000% or less, and still more preferably 150% or more and 600% or less. is there. The difference between the thickness of the middle and high region 43 and the thickness of the peripheral region 44 of the absorbent core 41 (former-latter) is preferably 0.5 mm or more, more preferably 1.5 mm or more, and further preferably 2.5 mm or more, and preferably 25 mm or less, more preferably 15 mm or less, even more preferably 10 mm or less, specifically, preferably 0.5 mm or more and 25 mm or less, more preferably 1.5 mm or more and 15 mm or less Or less, more preferably 2.5 mm or more and 10 mm or less. The thickness of each part of the absorbent core 41 is measured from a photograph of a cut end surface of the absorbent article under no load.

In the napkin 1A, the basis weight of the middle and high regions 43 is such that a raised portion 11 (see FIG. 1) protruding toward the skin is formed on the skin-facing surface of the napkin 1A to improve the liquid absorptivity and the like in the excretion portion-facing portion B. From the viewpoint of improvement, the basis weight of the peripheral area 44 of the absorbent core 41 (the average basis weight of the basis weight of the front peripheral area 44A, the basis weight of the rear peripheral area 44C, and the basis weight of the side peripheral area 44S, which will be described later). , Preferably 110% or more, more preferably 130% or more, even more preferably 150% or more, and preferably 600% or less, more preferably 400% or less, and still more preferably 300% or less. Specifically, it is preferably from 110% to 600%, more preferably from 130% to 400%, and still more preferably from 150% to 300%. The difference between the basis weight of the middle and high area 43 and the basis weight of the peripheral area 44 of the absorbent core 41 (the former-the latter) is preferably 20 g / m ² or more, more preferably 60 g / m ² or more, It is more preferably 100 g / m ² or more, and preferably 1000 g / m ² or less, more preferably 600 g / m ² or less, and further preferably 400 g / m ² or less. Specifically, it is preferably 20 g / m ² or more and 1000 g / m ² or less, more preferably 60 g / m ² or more and 600 g / m ² or less, and still more preferably 100 g / m ² or more and 400 g / m ² or less. In addition, the grammage of the middle-high region 43 is obtained by dividing the mass of a sample obtained by cutting out a portion where no middle-high groove portion 431 described below is present by the area of the sample on the skin-facing surface side. The grammage of the grammage of the peripheral region 44 is obtained by dividing the mass of a sample obtained by cutting out a portion where a groove 45 described later does not exist by the area of the sample on the skin-facing surface side.

  In the napkin 1A, as shown in FIGS. 4 to 6, the absorbent core 41 has a groove portion 45 that is thinner than the peripheral region 44 and has a lower basis weight than the peripheral region 44. I have. The thickness of the groove 45 depends on the point that the raised portion 11 (see FIG. 1) protruding toward the skin is formed on the skin-facing surface of the napkin 1A to improve the liquid absorbency and the like in the excretion-facing portion B. From the viewpoint of facilitating the deformation of the absorbent core 41, the thickness of the peripheral region 44 of the absorbent core 41 is preferably at least 10%, more preferably at least 13%, even more preferably at least 15%, and preferably 80% or less, more preferably 60% or less, further preferably 50% or less, specifically, preferably 10% or more and 80% or less, more preferably 13% or more and 60% or less, and further more preferably 15% or more and 50% or less. % Or less. The difference between the thickness of the peripheral region 44 of the absorbent core 41 and the thickness of the groove 45 (the former-the latter) is preferably 1 mm or more, more preferably 2 mm or more, and still more preferably 3 mm or more, and It is preferably 10 mm or less, more preferably 8 mm or less, further preferably 6 mm or less, and specifically, preferably 1 mm to 10 mm, more preferably 2 mm to 8 mm, and still more preferably 3 mm to 6 mm. The thickness of the groove 45 of the absorbent core 41 is measured from a photograph of the cut end surface of the absorbent article under no load.

In the napkin 1A, the basis weight of the groove 45 is such that a raised portion 11 (see FIG. 1) protruding toward the skin is formed on the skin-facing surface of the napkin 1A to improve the liquid absorbency and the like in the excretion-facing portion B. From the viewpoint of making the same, the basis weight of the peripheral region 44 of the absorbent core 41 is preferably 1% or more, more preferably 2% or more, still more preferably 4% or more, and preferably 80% or less, more preferably It is 60% or less, more preferably 50% or less, specifically, preferably 1% or more and 80% or less, more preferably 2% or more and 60% or less, and still more preferably 4% or more and 50% or less. The difference between the basis weight of the peripheral region 44 of the absorbent core 41 and the basis weight of the groove 45 (the former-the latter) is preferably 30 g / m ² or more, more preferably 50 g / m ² or more, and furthermore It is preferably at least 100 g / m ² , and more preferably at most 500 g / m ² , more preferably at most 400 g / m ² , still more preferably at most 300 g / m ² , and specifically preferably at most 30 g / m 2. ^{It is 2 to} 500 g / m ² , more preferably 50 g / m ^{2 to} 400 g / m ² , and still more preferably 100 g / m ^{2 to} 300 g / m ² . The grammage of the groove 45 is obtained by dividing the mass of the sample obtained by cutting out the groove 45 by the area of the surface of the sample facing the skin.

  In the napkin 1A, as shown in FIG. 4, the groove 45 includes a middle-high circumferential groove 451 surrounding the middle-high region 43 and dividing the middle-high region 43 and the peripheral region 44, and a front end in the vertical direction X of the middle-high high-peripheral groove 451. A pair of front grooves 452, 452 extending from the portion toward the front A side of both sides 41S, 41S along the longitudinal direction X of the absorbent core 41, and absorbing from the rear end in the vertical direction X of the middle and high circumferential groove 451. And a pair of rear grooves 453 and 453 extending toward the rear part C of the both sides 41S, 41S along the longitudinal direction X of the conductive core 41. As described above, in the napkin 1 </ b> A, the groove 45 has the middle and high circumferential groove 451, the pair of front grooves 452 and 452, and the pair of rear grooves 453 and 453.

  In the napkin 1A, the middle and high circumferential groove 451 is arranged at a position surrounding the outer periphery of the middle and high region 43 as shown in FIG. As described above, when the absorbent core 41 is viewed in a plan view, since the front and rear end portions of the napkin 1A in the longitudinal direction X are recessed inward, the mid-high full-width groove portion of the napkin 1A is formed. Reference numerals 451 denote portions corresponding to the front and rear ends in the vertical direction X of the middle and high regions 43, respectively, which are recessed inward. Further, in the middle / high circumferential groove 451 of the napkin 1 </ b> A, portions corresponding to both side portions along the vertical direction X of the middle / high region 43 extend in the vertical direction X, respectively.

  In the napkin 1A, the pair of front grooves 452, 452 absorbs from both corners of the front end in the vertical direction X of the middle and high circumferential groove 451, respectively, when the absorbent core 41 is viewed in plan as shown in FIG. It extends toward the front part A side of both sides 41S, 41S along the longitudinal direction X of the sex core 41, and reaches the side edges of both sides 41S, 41S. The napkin 1A is formed such that the interval between the pair of front grooves 452, 452 gradually increases toward the front part A. The angle α (see FIG. 4) formed between the center line CL extending in the vertical direction X and one of the front grooves 452 is preferably 5 ° or more and 80 ° or less, and more preferably 7 ° or more and 70 ° or less. .

  In the napkin 1A, the pair of rear grooves 453 and 453 absorb the absorbent core 41 from both corners of the rear end in the vertical direction X in the middle and high circumferential groove 451, respectively, as shown in FIG. It extends toward the rear part C side of both sides 41S, 41S along the longitudinal direction X of the sex core 41, and reaches the side edges of both sides 41S, 41S. The napkin 1A is formed such that the interval between the pair of rear grooves 453 and 453 gradually increases toward the rear portion C. The angle β between the center line CL extending in the vertical direction X and one of the front grooves 452 (see FIG. 4) is the angle α between the center line CL extending in the vertical direction X and the one front groove 452 (see FIG. 4). ), More specifically, preferably from 7 ° to 85 °, and more preferably from 10 ° to 75 °.

  The groove width of the groove portion 45 may be the same as the groove width of the middle and high circumferential groove portion 451, the front groove portion 452, and the rear groove portion 453. By making the groove width wider than the groove width of the front groove portion 452, the middle and high circumferential groove portions 451 bend more preferentially than the front groove portion 452, and the protruding portion 11 ( From the viewpoint of facilitating formation of (see FIG. 1), the groove width of the middle and high circumferential groove 451 is formed to be wider than the groove width of the front groove 452 and the groove width of the rear groove 453. From the same viewpoint, the groove width of the middle and high circumferential groove 451 is preferably more than 100%, more preferably 105% or more, further preferably 120% or more of the groove width of the front groove 452 or the groove width of the rear groove 453. And preferably 1000% or less, more preferably 800% or less, even more preferably 600% or less, specifically, preferably more than 100% to 1000%, more preferably 105% to 800%, More preferably, it is 110% or more and 600% or less. Preferably, the groove width of the middle and high circumferential groove 451 is preferably 1 mm or more, more preferably 2 mm or more, still more preferably 3 mm or more, and preferably 10 mm or less, more preferably 8 mm or less, and still more preferably 6 mm or less. Specifically, it is preferably 1 mm or more and 10 mm or less, more preferably 2 mm or more and 8 mm or less, and still more preferably 3 mm or more and 6 mm or less. The groove width of the front groove 452 or the groove width of the rear groove 453 is preferably 0.5 mm or more, more preferably 1.5 mm or more, still more preferably 2.5 mm or more, and preferably 9 mm or less, more preferably It is 7 mm or less, more preferably 5 mm or less, specifically, preferably 0.5 mm or more and 9 mm or less, more preferably 1.5 mm or more and 7 mm or less, and still more preferably 2.5 mm or more and 5 mm or less. The groove width of the groove 45 is measured in a direction perpendicular to the direction in which the groove 45 extends, and is measured from a photograph of the cut end face.

  Further, in the napkin 1A, as shown in FIG. 4, the peripheral region 44 includes a front peripheral region 44A surrounded by a front end in the vertical direction X of the middle and high circumferential groove 451 and a pair of front grooves 452 and 452. A rear peripheral region 44C surrounded by a rear end in the vertical direction X of the entire circumferential groove 451 and a pair of rear grooves 453 and 453, and a side edge and a front groove 452 of the middle and high circumferential groove 451 along the vertical direction X. It has a pair of side peripheral regions 44S, 44S surrounded by the rear groove 453.

Further, the basis weight of the front peripheral region 44A, the basis weight of the rear peripheral region 44C, and the basis weight of the side peripheral region 44S may be formed uniformly, but in the napkin 1A, the napkin 1A is formed by dividing the napkin 1A into the middle and high circumferential grooves 451, The front groove 452 makes it easy to break, and the excretion part facing part B makes it easy to form the raised part 11 (see FIG. 1) protruding toward the skin. When received, from the viewpoint that the peripheral region 44 is deformed earlier than the middle and high region 43 and the middle and high region 43 is hardly deformed, the lateral peripheral region 44S has the basis weight of the front peripheral region 44A. It is formed higher than the basis weight of the rear peripheral area 44C. The basis weight of the lateral peripheral region 44S of the absorbent core 41 is preferably more than 100%, more preferably 110% or more, and more preferably the basis weight of the front peripheral region 44A or the rear peripheral region 44C. , 150% or more, and preferably 600% or less, more preferably 400% or less, further preferably 300% or less, specifically, preferably 110% or more and 600% or less, more preferably 130% or less. Not less than 400%, more preferably not less than 150% and not more than 300%. The difference between the basis weight of the side peripheral region 44S and the basis weight of the front peripheral region 44A or the basis weight of the rear peripheral region 44C (the former-the latter) is preferably 20 g / m ² or more, more preferably. Is at least 50 g / m ² , more preferably at least 100 g / m ² , and preferably at most 600 g / m ² , more preferably at most 300 g / m ² , further preferably at most 200 g / m ² , Is preferably 20 g / m ² or more and 600 g / m ² or less, more preferably 50 g / m ² or more and 300 g / m ² or less, and still more preferably 100 g / m ² or more and 200 g / m ² or less.

  In the napkin 1A, the entire absorbent core 41 having the middle and high region 43, the peripheral region 44, and the groove 45 is integrally formed. "Integrally molded" means that members manufactured in different processes are joined together by bonding means such as adhesive or compression, and are integrally formed in one process using the same material. Means that it is.

As shown in FIG. 7A, the absorbent core 41 of the napkin 1A has a stacking concave portion 55 on an outer peripheral surface thereof, and a stacking drum 54 rotating in one direction R, and an outer periphery of the stacking drum 54. It can be manufactured using a fiber stacking device provided with a duct (not shown) for supplying the core material in a scattered state on the surface.
Plural concave portions 55 are formed at regular intervals in the circumferential direction of the outer peripheral surface of the stacking drum 54. The bottom surface 56 of the accumulation concave portion 55 is formed of a mesh plate or the like, and has a large number of pores functioning as suction holes.

  Further, as shown in FIG. 7A, one recess 56b for forming the middle and high region 43 is formed in a part of the bottom surface 56 of one integration recess 55. Further, on the bottom surface 56 in the peripheral region of the concave portion 56b, a gas-impermeable member 57 for forming the groove portion 45 is arranged. The air-impermeable member 57 is disposed at a position corresponding to the middle and high circumferential grooves 451, the pair of front grooves 452, 452, and the pair of rear grooves 453, 453, and is fixed so as to protrude from the bottom surface 56 of the collecting recess 55. ing. The air-impermeable member 57 may be a non-air-permeable member, and is made of, for example, metal, plastic, ceramic, or the like.

  As in the known stacking device having a stacking drum, by supplying the core material in which the water-absorbing polymer and the pulp fiber are mixed into the duct while sucking from the bottom surface of the stacking recess 55, FIG. As shown in (b), the core material is deposited in a predetermined shape in the accumulation recess 55. The absorbent core 41 is obtained by releasing the deposit 40 from the accumulation concave portion 55. Before or after the absorbent core 41 is covered with the core wrap sheet 42, the absorbent core 41 is pressed and appropriately compressed by passing it between a pair of rolls or the like. Thereby, the portion deposited in the concave portion 56b becomes the middle and high region 43 having a relatively large basis weight and density. Similarly, the portion made of the core material deposited in the peripheral region of the concave portion 56b becomes the peripheral region 44 having a relatively small basis weight and density, and the core material deposited on the air-impermeable member 57 in the peripheral region of the concave portion 56b. The portion becomes a groove portion 45 having a smaller basis weight and density than the peripheral region 44.

The material for forming each component of the napkin 1A of the first embodiment will be described.
As the top sheet 2 and the back sheet 3, various kinds of articles conventionally used for absorbent articles such as sanitary napkins can be used without any particular limitation. For example, as the topsheet 2, liquid-permeable sheets such as various nonwoven fabrics or apertured films that have been subjected to a hydrophilic treatment can be used. As the back sheet 3, a liquid-permeable or water-repellent sheet such as a thermoplastic resin film or a laminate of the film and a nonwoven fabric can be used. The back sheet 3 may have water vapor permeability. Further, as the core wrap sheet 42, a thin paper (tissue paper) manufactured by a wet papermaking method, a liquid-permeable nonwoven fabric, or the like can be used.

The operation and effect of the napkin 1A of the first embodiment will be described.
As shown in FIGS. 2 to 4, the napkin 1 </ b> A has, in the absorbent core 41, a middle-high area 43 having a larger thickness and a higher basis weight than the peripheral area 44. The groove portion 45 that divides the middle and high region 43 and the peripheral region 44 and has a lower basis weight than the peripheral region 44 has a middle and high peripheral groove portion 451, a pair of front groove portions 452 and 452, and a pair of rear groove portions 453 and 453. are doing. Therefore, as shown in FIG. 1, while wearing the napkin 1 </ b> A, the middle / high area 43 protrudes toward the skin, and the protruding part 11 protruding toward the skin is easily formed at the excretion part facing part B, Due to the compressive force from both legs in the width direction in the sleeping posture, the raised middle / high area 43 is hard to bend. As described above, the fitting to the body can be maintained by the raised portion 11 while the napkin 1A is worn, and liquid leakage hardly occurs. Since the front groove portion 452 extends toward the front portion A, the napkin 1A is more easily fitted from the crotch portion to the abdomen of the wearer. In addition, since the rear groove portion 453 extends toward the rear portion C, the napkin 1A is more easily fitted from the crotch portion to the buttocks of the wearer.

  In the napkin 1A, as shown in FIGS. 2 to 4, the peripheral region 44 of the absorbent core 41 has a front peripheral region 44A, a rear peripheral region 44C, and a pair of side peripheral regions 44S, 44S. The basis weight of the side peripheral region 44S is formed higher than the basis weight of the front peripheral region 44A and the basis weight of the rear peripheral region 44C. Therefore, as shown in FIG. 1, while wearing the napkin 1 </ b> A, the middle and high region 43 protrudes toward the skin, and the protruding portion 11 protruding toward the skin at the excretion part facing portion B is further easily formed. Has become. In the napkin 1A, as shown in FIG. 4, the front and rear ends of the middle and high region 43 in the longitudinal direction X are respectively recessed inward when the absorbent core 41 is viewed in plan. Therefore, as shown in FIG. 1, while wearing the napkin 1 </ b> A, the middle and high region 43 protrudes toward the skin, and the protruding portion 11 protruding toward the skin at the excretion part facing portion B is further easily formed. Has become. Further, the front and rear ends in the vertical direction X of the middle and high region 43 are respectively depressed inward, so that when the side peripheral region 44S and the rear peripheral region 44C are bent, the middle and high region 43 and the side peripheral region 44C are bent. Compression is unlikely to occur between the region 44S and between the rear peripheral region 44C and the middle and high region 43, and can be smoothly bent.

  Next, a sanitary napkin 1B (hereinafter, simply referred to as a napkin 1B) as a second embodiment of the present invention will be described. Regarding the napkin 1B, the points different from the napkin 1A will be mainly described, and the same points will be denoted by the same reference numerals and the description thereof will be omitted. The description regarding the napkin 1A is appropriately applied to the points not particularly mentioned. In addition, the effect of the napkin 1B will be described on the points different from the effect of the napkin 1A, and the points that are not particularly described are the same as the effects of the napkin 1A, and the description of the effect of the napkin 1A is appropriately applied.

  In the napkin 1B, as shown in FIG. 8, the absorbent core 41 is viewed in a plan view, and the middle and high region 43 is divided by a middle and high groove 431 extending in the lateral direction Y, and the middle and high groove 431 faces the front part A side. It is formed to be convex. Preferably, the middle and high region 43 is divided by a plurality of middle and high groove portions 431, and the middle and high region 43 is formed with a plurality of small absorption portions 432 arranged along the vertical direction X. Each of the middle and high grooves 431 is formed to be convexly curved toward the front part A side. In the napkin 1B, as shown in FIG. 8, the front end of the middle and high region 43 in the vertical direction X is formed so as to protrude toward the front portion A side when the absorbent core 41 is viewed in a plan view. The rear end of the vertical direction X is formed so as to protrude toward the rear part C side.

  In the napkin 1B, as shown in FIG. 8, when the absorbent core 41 is viewed in a plan view, each of the front and rear ends in the longitudinal direction X of the middle and high region 43 of the napkin 1B is formed to protrude toward the front and rear ends of the absorbent core 41. In the napkin 1B, the portions corresponding to the front and rear ends in the longitudinal direction X of the middle and high regions 43 of the napkin 1B are formed so as to protrude toward the front and rear ends of the absorbent core 41, respectively. I have.

  The above-described napkin 1B having the absorbent core 41 shown in FIG. 8 is formed by interposing the absorber 4 including the absorbent core 41 between the top sheet 2 and the back sheet 3 as shown in FIG. Have been. In the napkin 1B, as shown in FIG. 9, a pair of linear grooves 6 in which the topsheet 2 and the absorber 4 are integrally recessed toward the backsheet 3 are formed on the skin-facing surface of the topsheet 2. ing. The term “linear” in the linear groove 6 means that the shape of the groove (recess) is not limited to a straight line in plan view, but includes a curve. Each line may be a continuous line or a broken line. The linear grooves 6 are formed by squeezing the top sheet 2 and the absorber 4 toward the back sheet 3, and have a higher density than other regions except the linear grooves 6. In the napkin 1B, each linear groove 6 is formed corresponding to the groove 45, and in the napkin 1B, one linear groove 6 extends in the vertical direction X of the middle-high region 43 in the middle-high circumferential groove 451 of the napkin 1B. Along the outside in the horizontal direction Y of the portion corresponding to one side along the lengthwise direction, it extends in the vertical direction X along the portion. Also, in the napkin 1B, one linear groove 6 extends laterally outside the one front groove 452 and one rear groove 453 in the horizontal direction Y, and extends in the vertical direction X along one front groove 452 and one rear groove 453. Extending. As described above, one linear groove 6 is disposed on the outer side in the lateral direction Y along one front groove 452, a portion corresponding to one side of the middle and high circumferential groove 451, and one rear groove 453. ing. Similarly, the other linear groove 6 is arranged on the outside in the lateral direction Y along the other front groove 452, the portion corresponding to the other side of the middle and high circumferential groove 451, and the other rear groove 453. I have. Thus, each linear groove 6 is formed in each side peripheral region 44S. The pair of linear grooves 6, 6 are arranged symmetrically with respect to a center line CL extending in the vertical direction X.

  The linear groove 6 can be formed according to a conventional method by pressing with or without heat (so-called embossing) or embossing such as ultrasonic embossing.

  In the napkin 1B of the second embodiment, the middle and high regions 43 of the absorbent core 41 are divided by the middle and high grooves 431, and the middle and high regions 43 are formed with a plurality of small absorbing portions 432 arranged along the vertical direction X. . For this reason, while wearing the napkin 1B, the middle and high area 43 protrudes toward the skin, and the protruding portion 11 protruding toward the skin is easily formed at the excretion part opposing portion B, and the width from both legs in the sleeping posture is easy. Even if it receives a compressive force directed inward in the direction, it can be buffered by the middle and high groove portions 431 of the raised middle and high regions 43, so that it is difficult to bend. As described above, the fitting to the body can be maintained by the raised portion 11 while the napkin 1A is worn, and liquid leakage hardly occurs. Further, the napkin 1A can fit the shape of the abdomen and buttocks, and can also buffer the compressive stress against compressive deformation in the abdomen and buttocks at bedtime, and can maintain fit.

  In the napkin 1B of the second embodiment, each linear groove 6 is formed corresponding to the groove 45. Therefore, it is easy to bend around each linear groove 6, and the middle and high region 43 protrudes toward the skin while the napkin 1 </ b> B is worn, and the protruding portion 11 protruding toward the skin at the excretory portion facing portion B is formed. Further, it is easy to form. Furthermore, even if a compressive force inward in the width direction is received from both legs, each linear groove 6 can protect the middle and high region 43 from compression.

  As described above, the present invention has been described based on the preferred embodiments. However, the absorbent article of the present invention is not limited to the napkin 1A of the first embodiment and the napkin 1B of the second embodiment, and can be appropriately changed. is there.

For example, the napkin 1A and the napkin 1B have a middle-high region 43 only in the excretion part facing portion B as shown in FIG. May be.
Further, the absorbent article of the present invention may be a sanitary napkin, a panty liner (vegetable sheet), an incontinence pad, or the like.

1A, 1B Sanitary napkin (absorbent article)
11 Raised portion 2 Top sheet 3 Back sheet 4 Absorber 41 Absorbent core 42 Core wrap sheet 43 Middle / high area 431 Medium / high groove section 432 Small absorbing section 44 Peripheral area 44A Front peripheral area 44C Back peripheral area 44S Side peripheral area 45 Groove 451 Middle high Full circumference groove 452 Front groove 453 Rear groove

Claims (5)

A longitudinally long absorbent core corresponding to the front-rear direction of the wearer is provided, the excretory portion facing portion disposed to face the liquid excretion portion of the wearer, a front portion disposed forward of the excretory portion facing portion, And an absorbent article having a rear portion disposed rearward from the excretion portion facing portion,
The absorbent core has a middle and high region in a central portion in a horizontal direction orthogonal to a vertical direction in the excretion portion facing portion,
The middle-high region is thicker than the thickness of the peripheral region of the middle-high region in the absorbent core, and is formed to have a higher grammage than the grammage of the peripheral region,
The absorbent core has a groove portion having a thickness smaller than the thickness of the peripheral region and having a basis weight lower than the basis weight of the peripheral region,
The groove portion surrounds the middle-high region and divides the middle-high region and the peripheral region.A middle-high full-peripheral groove portion, and both side portions along the longitudinal direction of the absorbent core from a vertical front end portion of the middle-high full-circle groove portion. A pair of front grooves extending toward the front of the absorbent core, and a pair of rear grooves extending from the vertical rear ends of the middle and high circumferential grooves to the rear sides of both sides along the longitudinal direction of the absorbent core. It has a door,
An absorbent article in which the longitudinal front and rear ends of the middle and high region are respectively depressed inward when the absorbent core is viewed in plan .   2. The absorbent article according to claim 1, wherein a groove width of the middle-high circumferential groove is wider than a groove width of the front groove and a groove width of the rear groove. The peripheral region of the absorbent core, a front peripheral region surrounded by the longitudinal front end of the middle and high circumferential groove and the pair of front grooves, a vertical rear end of the middle and high circumferential groove and A rear peripheral region surrounded by the pair of rear grooves, and a pair of lateral peripheral regions surrounded by the front edge and the rear groove along the longitudinal edge of the middle and high circumferential groove. And
The absorbent article according to claim 1, wherein a basis weight of the side peripheral region is higher than a basis weight of the front peripheral region and the rear peripheral region. In a plan view of the absorbent core, the middle and high region is divided by a middle and high groove portion extending in a lateral direction,
The absorbent article according to any one of claims 1 to 3, wherein the middle and high groove portions are formed so as to protrude toward the front portion side . A longitudinally long absorbent core corresponding to the front-rear direction of the wearer is provided, the excretory portion facing portion disposed to face the liquid excretion portion of the wearer, a front portion disposed forward of the excretory portion facing portion, And an absorbent article having a rear portion disposed rearward from the excretion portion facing portion,
The absorbent core has a middle and high region in a central portion in a horizontal direction orthogonal to a vertical direction in the excretion portion facing portion,
The middle-high region is thicker than the thickness of the peripheral region of the middle-high region in the absorbent core, and is formed to have a higher grammage than the grammage of the peripheral region,
The absorbent core has a groove portion having a thickness smaller than the thickness of the peripheral region and having a basis weight lower than the basis weight of the peripheral region,
The groove portion surrounds the middle-high region and divides the middle-high region and the peripheral region.A middle-high full-peripheral groove portion, and both side portions along a longitudinal direction of the absorbent core from a vertical front end portion of the middle-high full-circle groove portion. A pair of front grooves extending toward the front of the absorbent core, and a pair of rear grooves extending from the vertical rear ends of the middle and high circumferential grooves to the rear sides of both sides along the longitudinal direction of the absorbent core. And has
In a plan view of the absorbent core, the middle and high region is divided by a middle and high groove portion extending in a lateral direction,
Intake Osamusei article said convex grooves, that are formed in a convex toward the front side.

Images