JP5977653B2 - Absorbent articles - Google Patents

Description

  The present invention relates to absorbent articles such as sanitary napkins, panty liners, and incontinence pads.

  Conventionally, it has been known that an absorbent body in an absorbent article such as a sanitary napkin is provided with a raised portion along the uneven shape of the wearer's skin, and it is also known that a groove is formed in the raised portion. ing. For example, Patent Documents 1 and 2 disclose an absorber having a raised portion having a groove near the center of the absorber.

JP 2009-112590 A JP 2012-125366 A

The absorber in Patent Document 1 has a laminated structure having an upper layer and a lower layer, and a depression extending over the upper and lower layers is formed in a central region where the upper layer exists and forms a raised portion. However, the recess is formed by hot embossing, and since the vicinity of the bottom of the recess is consolidated, the liquid hardly diffuses from the vicinity of the bottom of the recess to other parts, preventing wetback performance and absorption. There is room for improvement in terms of effective utilization of the body's absorption capacity.
Further, Patent Document 2 discloses an absorbent body having a large number of block-shaped convex portions provided with raised portions that are similarly composed of a large number of convex portions. However, the depth of the groove formed between the block-shaped convex portions in the raised portion is different between the excretory portion facing portion disposed opposite to the wearer's liquid excretion portion and the rear portion disposed behind it. There is no suggestion about making it happen.

  Therefore, the subject of this invention is providing the absorbent article which can eliminate the fault which the prior art mentioned above has.

  The present invention is an absorbent article provided with an absorbent core having a long shape in the front-rear direction of the absorbent article, the absorbent core having a central region and lateral regions located on both sides thereof in the width direction. The central region has a protruding portion that protrudes upward from the upper surface of each of the lateral regions, and the absorbent core has the central region and the lateral regions integrally formed; The protruding portion is formed from an excretion portion facing portion disposed opposite to the liquid excretion portion of the wearer to a rear portion disposed rearward from the excretion portion facing portion, and the absorptivity is provided on the protruding portion. A plurality of transverse grooves along the width direction of the core are formed, the transverse grooves are formed by reducing the basis weight of the material forming the absorbent core, and the transverse grooves formed in the rear part are the excretory part The present invention provides an absorbent article having a depth greater than that of the lateral groove formed in the facing portion.

  Further, the present invention is an absorbent article provided with an absorbent core having a long shape in the front-rear direction of the absorbent article, wherein the absorbent core is located in the width direction in the central region and on the sides located on both sides thereof. The central region has a protruding portion that protrudes upward from the upper surface of each of the lateral regions, and the absorbent core is formed by integrally molding the central region and the lateral region. The projecting portion is formed from the excretion portion facing portion disposed opposite to the liquid excretion portion of the wearer to the rear portion disposed behind the excretion portion facing portion, and the projecting portion includes A plurality of transverse grooves are formed along the width direction of the absorbent core, the transverse grooves are formed by reducing the basis weight of the material forming the absorbent core, and the transverse grooves formed in the rear part are The present invention provides an absorbent article having a width wider than that of the lateral groove formed in the excretory part facing part.

  According to the absorbent article of the present invention, the absorbent core has a protruding portion, is excellent in fit to the concave portion of the body, and so that the absorbent core follows the curved shape of the body in a wide range in the front-rear direction of the wearer. It is easily deformed and has excellent fit to the skin of the entire absorbent article. In addition, since the absorbent core maintains a stable shape, it is difficult for the absorption capacity to decrease due to the absorbent core being swung, and liquid return to the skin contact surface is unlikely to occur.

FIG. 1 is a perspective view showing a sanitary napkin according to a first embodiment of the present invention. 2A, 2B, and 2C are a sectional view taken along line IIa-IIa, a sectional view taken along line IIb-IIb, and a sectional view taken along line IIc-IIc in FIG. 3 is a cross-sectional view taken along line III-III in FIG. FIG. 4 is a schematic view showing a deformed state of the absorbent core when the sanitary napkin of FIG. 1 is worn. FIG. 5 is a schematic view showing a cross section along a circumferential direction of a fiber pile drum preferably used for manufacturing the absorbent core of the sanitary napkin shown in FIG. FIG. 6: is the (a) top view, (b) VIa-VIa sectional view, and (c) VIb-VIb sectional drawing which show the absorptive core of the sanitary napkin which is 2nd Embodiment of this invention. . FIG. 7: is the (a) top view, (b) VIIa-VIIa sectional view, and (c) VIIb-VIIb sectional drawing which show the absorptive core of the sanitary napkin which is 3rd Embodiment of this invention. . FIG. 8: is the (a) top view, (b) VIIIa-VIIIa sectional view taken on the line, and (c) VIIIb-VIIIb sectional view showing the absorptive core of the sanitary napkin which is 4th Embodiment of this invention. .

The present invention will be described below based on preferred embodiments with reference to the drawings.
A sanitary napkin 1 (hereinafter also simply referred to as napkin 1) as a first embodiment of the absorbent article of the present invention is a night napkin suitable for use at bedtime.
As shown in FIG. 1, the napkin 1 has an absorbent main body 6 that is long in the front-rear direction, a pair of wing portions 7, 7, and a pair of rear flap portions 8, 8. With respect to absorbent articles such as sanitary napkins, the “front-rear direction” is a direction that coincides with the wearer's front-rear direction when worn.
The absorptive main body 6 has a front part A, a liquid excretion part facing part B, and a rear part C in its longitudinal direction, and a pair of wing parts 7 and 7 on the left and right sides of the liquid excretion part facing part B. The left and right sides of the part C have a pair of rear flap parts 8 and 8. The liquid excretion part facing part B is a part arranged opposite to the wearer's liquid excretion part (vaginal opening) at the center part in the width direction, and the front part A is the front side of the wearer from the liquid excretion part facing part B. The rear part B is a part arranged on the back side of the wearer from the liquid excretion part facing part B. In this specification, at the time of wearing (at the time of wearing), the direction closer to the side in contact with the skin of the wearer is referred to as the skin contact surface side or the upper side, and the far side is referred to as the non-skin contact surface side or the lower side.

  The napkin 1 includes a skin-side sheet 2 that forms a skin contact surface that faces the wearer's skin when worn, a non-skin-side sheet 3 that forms a non-skin contact surface that faces the clothing side such as shorts when worn, And the absorptive core 4 arrange | positioned between these both sheets 2 and 3 is provided. The skin-side sheet 2 includes a liquid-permeable surface sheet 2a and a pair of three-dimensional guard forming sheets 2b and 2b joined to both sides thereof. The liquid permeable top sheet 2 a is arranged at the center in the width direction of the absorbent main body 6 so as to cover the entire length of the absorbent main body 6. The three-dimensional guard forming sheet 2b is formed in such a manner that the side edge 21 on the center side in the width direction of the absorbent main body is overlapped on the surface sheet 2a at a position slightly outward from the side edge 21 in the width direction. 2a. The solid guard forming sheet 2b has an elastic member (not shown) for forming a solid guard in the vicinity of the side edge portion 21, and when worn, due to the contraction force of the elastic member, the liquid excretion portion facing portion A solid guard is formed by standing so that a portion having a predetermined width from the side edge portion 21 in B is separated from the top sheet 2a.

  The pair of wing portions 7, 7 and the pair of rear flap portions 8, 8 are composed of a three-dimensional guard forming sheet 2 b and a non-skin side sheet 3 extending from both side edges of the absorbent core 4. A wing portion adhesive portion (not shown) for fixing to the non-skin contact surface of the crotch portion of the shorts is provided on the surface formed of the non-skin side sheet 3 of each of the pair of wing portions 7. The non-skin contact surface is provided with a main body adhesive portion (not shown) for fixing the main body 6 to the inner surface of the shorts. The rear flap 8 is arranged on the inner surface (skin contact surface) of the shorts when worn. It is preferable that an adhesive portion for fixing to the inner surface of the shorts is also provided on the surface of the rear flap portion 8 made of the non-skin side sheet 3. The skin-side sheet 2 and the non-skin-side sheet 3 are joined to each other with an adhesive from the periphery of the absorbent core 4 and are joined to each other at the periphery of the napkin 1 by heat sealing. The skin-side sheet 2 and the absorbent core 4 and the absorbent core 4 and the non-skin-side sheet 3 are also bonded to each other by a pattern-coated adhesive such as dots, spirals, and stripes. Is preferred.

  The absorbent core 4 in the napkin 1 is composed of a fiber assembly made of a fiber material such as pulp fiber or a superabsorbent polymer held between fibers of the fiber assembly. The upper and lower surfaces of the absorbent core 4 are covered with a core wrap sheet (not shown) made of tissue paper or a water-permeable nonwoven fabric. The core wrap sheet is used for the purpose of preventing leakage of the forming material of the absorbent core or improving the shape retention of the absorbent core.

As shown in FIG. 1, the absorbent core 4 in the napkin 1 has a shape that is long in the same direction as the front-rear direction of the napkin 1. Moreover, the absorptive core 4 has the center area | region 41 and the side areas 45 and 45 located in the both sides in the width direction Y, as shown to Fig.2 (a)-FIG.2 (c), The central region 41 has a protruding portion 5 that protrudes upward from the upper surfaces S2 and S2 of the lateral regions 45 and 45, respectively.
In the napkin 1, the protruding portion 5 of the absorbent core 4 exists under the top sheet 2 a, so that a raised portion 11 that protrudes toward the wearer's skin is formed at the center in the width direction of the skin contact surface. ing.
In the protruding portion 5, the ratio of the height t protruding from the upper surface S <b> 2 of the lateral region 45 to the total thickness t <b> 1 of the central region 41 is preferably 20% in both the liquid excretion portion facing portion B and the rear portion C. Or more, more preferably 30% or more, preferably 90% or less, more preferably 80% or less, preferably 20% or more and 90% or less, more preferably 30% or more and 80% or less. It is. The protrusion height t of the protrusion 5 is the same as the value obtained by subtracting the thickness t2 of the side area 45 from the total thickness t1 of the central area 41.
Further, the width W1 of the protrusion 5 [see FIG. 2 (a)] is preferably 20% or more, more preferably 30% or more, and preferably 80% or less, with respect to the total width W2 of the absorbent core. More preferably, it is 70% or less, preferably 20% or more and 80% or less, more preferably 30% or more and 70% or less.

The protrusion 5 of the absorbent core 4 and the raised portion 11 formed thereby in the napkin 1 have a long shape in the longitudinal direction X of the absorbent core 4 as shown in FIG. It is formed from the liquid excretion part facing part B to a part of the rear part C. More specifically, it is formed from a portion in front of the front end portion of the liquid excretion portion facing portion B to a portion in the rear portion C behind the center portion in the X direction.
It is preferable that the protrusion part 5 and the protruding part 11 are formed from the liquid excretion part opposing part B to a part of the rear part C in the front-rear direction X of the napkin 1 (absorbent article). Moreover, it is preferable that the protrusion part 5 and the protruding part 11 are formed over the length of 30% or more of the total length of the napkin 1 in the front-rear direction X, and the length of the total length of the napkin 1 is 40% or more. More preferably, it is formed over 50% or more of the total length of the napkin 1.

  In the central area 41 of the absorbent core 4, as shown in FIG. 3, high basis weight portions 42 and low basis weight portions 43 are alternately formed in the longitudinal direction X of the absorbent core 4. The low basis weight portion 43 extends along the width direction Y of the absorbent core 4. The high basis weight portion 42 is a portion where the basis weight of the absorbent core forming material is relatively higher than the adjacent low basis weight portion 43.

  In the napkin 1 of the present embodiment, with respect to the high basis weight portion 42, the liquid excretion portion facing portion B and the rear portion C have substantially the same basis weight, whereas the low basis weight portion 43 has the rear portion C. The basis weight of the low basis weight part 43 is smaller than the basis weight of the low basis weight part 43 of the liquid excretion part facing part B.

In the central area 41 existing in the liquid excretion part facing part B, the ratio of the basis weight of the low basis weight part 43 to the basis weight of the high basis weight part 42 is preferably 20% or more, more preferably 30% or more, Moreover, it is preferably 90% or less, more preferably 80% or less, preferably 20% or more and 90% or less, more preferably 30% or more and 80% or less.
On the other hand, in the central area 41 existing in the rear part C, the basis weight of the low basis weight part 43 is preferably 5% or more, more preferably 10% or more, with respect to the basis weight of the high basis weight part 42. Preferably, it is 50% or less, more preferably 40% or less, preferably 5% or more and 50% or less, more preferably 10% or more and 40% or less.
In each of the liquid excretion part facing part B and the rear part C, the basis weight of the high basis weight part 42 is preferably 250 g / m ² or more, more preferably 300 g / m ² or more, and preferably 800 g. / M ² or less, more preferably 700 g / m ² or less, preferably 250 g / m ² or more and 800 g / m ² or less, more preferably 300 g / m ² or more and 700 g / m ² or less.

In each of the liquid excretion part facing part B and the rear part C, the high basis weight part 42 not only has a larger basis weight than the low basis weight part 43 but also has a larger thickness.
The thickness of the low basis weight part 43 in the liquid excretion part facing part B is preferably 20% or more, more preferably 30% or more, and preferably 90% or less, with respect to the thickness of the high basis weight part 42. More preferably, it is 80% or less, preferably 20% or more and 90% or less, more preferably 30% or more and 80% or less.
The thickness of the low basis weight portion 43 in the rear portion C is such that the ratio to the thickness of the high basis weight portion 42 is preferably 5% or more, more preferably 10% or more, and preferably 50% or less, more preferably 40% or less, preferably 5% or more and 50% or less, more preferably 10% or more and 40% or less.
In each of the liquid excretion part facing part B and the rear part C, the thickness of the high basis weight part 42 is preferably 3 mm or more, more preferably 4 mm or more, and preferably 10 mm or less, more preferably 8 mm or less. Moreover, it is preferably 3 mm or more and 10 mm or less, more preferably 4 mm or more and 8 mm or less.

  Moreover, in each of the liquid excretion part opposing part B and the back part C, the high basic weight part 42 and the low basic weight part 43 and a density are substantially uniform. That is, the thickness of the high basis weight portion 42 is increased according to the basis weight of the absorbing member, and the thickness of the low basis weight portion 43 is decreased according to the basis weight of the absorbing member.

[Measurement method of basis weight of high basis weight part and low basis weight part]
An absorptive core is cut | disconnected using the single blade razor by a feather company along the boundary line of a high basic weight part and a low basic weight part, and the small piece of a high basic weight part and a low basic weight part is obtained. A high basic weight part cuts out the part pinched | interposed into a pair of low basic weight parts 43 and 43 in the center area 41 as a small piece. When the small piece includes the vertical groove 50 extending in the vertical direction as in the second embodiment to be described later, individual pieces obtained by removing the low basis weight portion existing on the bottom surface of the vertical groove 50 are measured. Used for. The small piece of a low basic weight part cuts out the narrow part pinched between a pair of high basic weight parts 42 and 42 in the center area 41 as a small piece.
The weights of these pieces are measured using an electronic balance (Electronic balance GR-300 manufactured by A & D, accuracy: 4 digits after the decimal point). The basis weight of the small piece is calculated by dividing the obtained weight by the area of the small basis weight portion or the low basis weight portion. About each of a high basic weight part and a low basic weight part, let the average of 5 basic weights of a small piece be a basic weight.

[Method for measuring thickness and density of high basis weight part and low basis weight part]
The thicknesses of the high basis weight 42 and the low basis weight 43 are measured by measuring the thickness of a small piece cut out using a single blade razor manufactured by Feather Co., Ltd. in order to measure the basis weight at each part. The measurement part of the small basis weight 42 and the low basis weight part 43 cut out from the absorbent article is pressurized at 5 kPa for 10 minutes, and the measurement is performed immediately after dewetting. An acrylic plate having a size of 20 mm × 20 mm and a thickness of 3 mm is placed on the absorber 3 in the center area of the sample, and a non-contact type laser displacement meter (laser head LK-G30, displacement meter LK-GD500) manufactured by KEYENCE is used. Measure the thickness of the sample. When it is difficult to measure with a non-contact type laser displacement meter, the cross section of the cut sample is observed and measured at a magnification of 20 to 100 times using, for example, a microscope (VHX-1000 manufactured by KEYENCE). May be. The thickness of the high basis weight part and the low basis weight part and the depth of the lateral groove are preferably measured by measuring the thickness and depth in the cross section at the longitudinal center line that divides the absorbent core into two equal parts. When there is a vertical groove on the longitudinal center line as in the second embodiment, measurement is performed while avoiding the vertical groove.
The density of the high basis weight part and the low basis weight part is calculated from the basis weight and thickness measured as described above.

And the high basic weight part 42 and the low basic weight part 43 which have a basic weight difference and thickness difference are formed in said aspect, By the skin contact surface in the center area 41 of the absorptive core 4, A plurality of lateral grooves 44 that are recessed toward the non-skin contact surface side are formed to extend in the width direction Y of the absorbent core 4, respectively, and FIG. 2 (b), FIG. 2 (c), and FIG. As shown in FIG. 3, the depth d2 of the lateral groove 44b formed in the rear part C is deeper than the depth d1 of the lateral groove 44a formed in the liquid excretion part facing part B.
In the present specification, the skin contact surface is a surface directed toward the wearer's skin when worn on the absorbent article or its constituent member, and the non-skin contact surface is when worn on the absorbent article or its constituent member. It is a surface directed to the side opposite to the wearer's skin side.

The absorbent core 4 has a central area 41 including the protruding portion 5 and a pair of side areas 45, 45 formed integrally. “Integrally molded” means that the same material is used to form parts in one process, unlike the case where members manufactured in different processes are joined by means of bonding, such as adhesives or compression. Means that Therefore, for example, between the portion 42u forming the protruding portion 5 in the central region 41 and the portion 42d located below the portion 42u, there are layers of layers that are produced when two separately manufactured absorbent cores are stacked. There are no adjacent portions or joint portions, and adjacent portions between cores generated when two separately manufactured absorbent cores are arranged side by side at the boundary portion between the central region 41 and the side regions 45, 45. There is no joint.
When the central region 41 including the protruding portion 5 and the pair of side regions 45, 45 are integrally formed, the liquid to be absorbed has continuity that can move smoothly. A method for manufacturing the absorbent core having such a structure will be described later.

  In addition, the absorbent core 4 in the napkin 1 has the protrusions 5 and the lateral grooves 44 so that the skin contact surface side has an uneven shape, while the non-skin contact surface side is flat.

  According to the napkin 1 of this embodiment, while having the horizontal groove 44 in the center area 41 of each of the liquid excretion part opposing part B and the rear part C, the depth d2 of the horizontal groove 44b of the rear part C is liquid excretion. Since the depth d1 of the lateral groove 44a of the part-opposing part B is deeper, as shown in FIG. 4, the protruding part 5 and the raised part 11 formed thereby are arranged along the wearer's liquid excretion part and rupture. The cross-sectional shape of the absorbent core 4 can be deformed along the curved shape of the wearer's body from the liquid excretion part facing part B to the rear part C. Thereby, while being excellent in the fitting property with respect to the unevenness | corrugation of a body over the full length of the napkin 1, it is excellent in the followable deformation property with respect to a wearer's movement, and it is hard to give the uncomfortable feeling resulting from a wrinkle or a breakage | absorption of an absorptive core.

Unlike the groove portion of the present invention, when the transverse groove portion is formed by partial compression, the transverse groove portion has a higher density than the other portions and acts as a flexible shaft, so that the bending rigidity is increased. On the other hand, since the lateral groove portion becomes hard, it is easy for the wearer to feel a sense of discomfort due to wearing.
On the other hand, since the horizontal groove part 44 of the napkin 1 is formed on the skin contact surface side of the low basic weight part 43 whose thickness is reduced by partially reducing the basic weight of the absorbent material, The density of the low basis weight portion 43 and the high basis weight portion 42 formed on the bottom surface of the portion is substantially uniform. For this reason, while the horizontal groove part 44 prompts the deformation | transformation of the absorptive core 4 rapidly, the horizontal groove part 44 does not become partially hard and it is hard to make a wearer feel uncomfortable by mounting | wearing.

  Moreover, since the absorbent core is integrally formed and the lateral groove 44 is formed by reducing the basis weight of the material for forming the absorbent core 4, the liquid absorbed from the protruding portion 5 is absorbed in the central region 41. While smoothly diffusing in the thickness direction, the liquid easily diffuses from near the bottom of the lateral groove 44 to other parts, and the liquid staying near the bottom of the lateral groove 44 does not return to the skin contact surface by pressurization. . Therefore, even when a large amount of liquid is supplied, the liquid hardly remains on the skin contact surface, and a comfortable wearing feeling can be obtained.

From the viewpoint of ensuring good deformability along the body shape and the like, the depth d2 of the lateral groove 44b formed in the rear part C is a ratio to the depth d1 of the lateral groove 44a formed in the liquid excretion part facing part B. Preferably it is 125% or more, more preferably 150% or more, preferably 400% or less, more preferably 300% or less, preferably 125% or more and 400% or less, more preferably 150%. More than 300%.
Further, from the viewpoint of encouraging deformation along the shape of the wearer's body, the depth d1 of the lateral groove 44a formed in the liquid excretion portion facing portion B is the total thickness of the central region 44 in the liquid excretion portion facing portion B. The ratio to t1 is preferably 10% or more, more preferably 20% or more, preferably 80% or less, more preferably 70% or less, and preferably 10% or more and 80% or less. More preferably, it is 20% or more and 80% or less.

  In addition, in a case where the absorbent core fits well to a portion where the curvature radius of the skin surface behind the liquid excretion part of the wearer is relatively small and when a large amount of liquid is supplied, etc. From the viewpoint of suppressing liquid remaining on the skin contact surface, the depth d2 of the lateral groove 44b formed in the rear portion C is preferably a ratio of 50% or more to the total thickness t1 of the central region 44 in the rear portion C. More preferably, it is 60% or more, preferably 95% or less, more preferably 90% or less, preferably 50% or more and 95% or less, more preferably 60% or more and 90% or less. .

  Further, the width W of the lateral groove 44 is preferably 0.5 mm or more, more preferably 1 mm or more, preferably 10 mm or less, more preferably 5 mm or less, and 0.5 mm or more and 10 mm or less. Is preferably 1 mm or more and 5 mm or less. The width W of the lateral groove 44 is a dimension in the longitudinal direction X of the absorbent core as shown in FIG.

  Further, the lateral groove 44a formed in the liquid excretion part facing part B may be one or plural, and the lateral groove 44b formed in the rear part C may be one or plural. In addition, when there are a plurality of lateral grooves 44b formed in the rear part C, the groove part deeper than the lateral groove 44a formed in the liquid excretion part facing part B may be a part of the plurality. It may be all. Further, when a plurality of lateral grooves 44 are formed in the liquid excretion part facing part B and the rear part C, respectively, the rear part C is compared with the interval between the lateral grooves 44a formed in the liquid excretion part facing part B. It is preferable that the interval between the lateral grooves 44b formed in the narrower is narrower. The number of lateral grooves formed in the central region 41 having the protrusions 5 is preferably 2 or more, more preferably 4 or more, and preferably 15 or less, more preferably 10 or less, Preferably they are 2 or more and 15 or less, More preferably, they are 4 or more and 10 or less.

Moreover, in the napkin 1 of this embodiment, as shown in FIG.2 (b) and FIG. 3, the horizontal groove 44a formed in the liquid excretion part opposing part B is the center area 41 in the width direction Y of the absorptive core 4 The bottom 44d is positioned above the upper surface S2 of the side region 45 over the entire area. In FIG. 3, L <b> 1 is an imaginary line that indicates the height position of the upper surface S <b> 2 of the lateral region 45.
On the other hand, as shown in FIG. 2 (c) and FIG. 3, the lateral groove 44 b formed in the rear portion C has a bottom portion 44 d in the central portion of the central region 41 in the width direction Y of the absorbent core 4. It is located below the upper surface S2. Moreover, as shown in FIG.7 (c), in the absorptive core 4B of the sanitary napkin of 3rd Embodiment mentioned later, the horizontal groove 44b formed in the back part C is in the width direction Y of the absorptive core 4. A bottom portion 44 d in a portion adjacent to the side region 45 of the central region 41 is located below the upper surface S <b> 2 of the side region 45. Further, in the absorbent core 4C of the sanitary napkin of the fourth embodiment to be described later, the lateral groove 44b formed in the rear portion C has a bottom portion 44d extending over the entire central region 41 in the width direction Y of the absorbent core 4. The side region 45 is located below the upper surface S2.

  The whole or part of the central region 41 in the width direction Y of the absorbent core of the lateral groove 44b of the rear part C is located below the upper surface S2 of the side region 45, whereby the liquid excretion part of the wearer The rigidity of the product in the portion arranged further rearward is reduced, and it is possible to follow even in a part where the curvature of the body is increased, so that high fit is obtained. From the viewpoint of ensuring such an effect, the lateral groove 44b formed in the rear portion C is such that the entire area of the central area 41 in the width direction Y of the absorbent core is the same as that of the lateral area 45. More preferably, it is located below the upper surface S2.

  The lateral groove 44b of the rear portion C is preferably positioned below the upper surface S2 of the side region 45 over a length of 50% or more, more preferably 70% or more of the width W1 of the protruding portion 5. .

The absorptive core 4 of the napkin 1 described above is provided with the accumulation recess 55 on the outer peripheral surface, and the stacking drum 54 rotating in one direction A and the absorbent core forming material are scattered on the outer peripheral surface of the stacking drum 54. It can manufacture using a fiber stacking apparatus provided with the duct (not shown) supplied in a state.
A plurality of stacking recesses 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 recess 55 is made of a mesh plate or the like and has a large number of pores functioning as suction holes.

As shown in FIG. 5, a concave portion 56 a for forming the central region 41 having the protruding portion 5 is formed on a part of the bottom surface 56 of the accumulation concave portion 55. A breathable member 57 for forming a low basis weight such as the low basis weight 43 on the absorbent core is disposed at the bottom of the accumulation recess 55. The air-impermeable member 57 is fixed so as to protrude from the bottom surface of the accumulation recess 55, and may be a non-air-permeable member, for example, made of metal or plastic.
As shown in FIG. 5 (b), the material for forming the absorbent core is supplied into the duct while sucking from the bottom surface of the accumulation recess 55, as in the known fiber stacking device including the fiber stacking drum. The material for forming the absorbent core is deposited in a predetermined shape in the accumulation recess 55. The absorbent core 4 is obtained by releasing the deposit 4 ′ from the accumulation recess 55. The absorbent core 4 is pressed and compressed appropriately by passing between a pair of rolls before or after coating with the core wrap sheet. As a result, as shown in FIG. 5B, the portion 43 ′ made of the core forming material deposited on the air-impermeable member 57 becomes the low basis weight portion 43 having a relatively small basis weight and density, and the air permeability is difficult. The portion 42 ′ deposited on the bottom surface without the elastic member 57 becomes the high basis weight portion 42 having a relatively large basis weight and density. When manufacturing the absorptive core containing a water absorbing polymer, it is preferable to provide the introduction part of a water absorbing polymer in the middle of a duct.

  As the surface sheet 2a and the non-skin side sheet 3, those similar to those conventionally used in the technical field can be used without particular limitation. For example, as the top sheet 2a, a liquid-permeable nonwoven fabric or a perforated film can be used. As the non-skin side sheet 3, a water-repellent nonwoven fabric having a high water pressure resistance such as a liquid-impermeable film made of a synthetic resin or a spunbond-meltblown-spunbond laminated nonwoven fabric can be used. Further, as the three-dimensional guard forming sheet 2b, a water-repellent nonwoven fabric having a high water pressure resistance, such as a spunbond-meltblown-spunbond laminated nonwoven fabric, or the like can be used.

  Next, sanitary napkins according to second to fifth embodiments of the present invention will be described. The sanitary napkins of the second to fifth embodiments differ from the first embodiment in the configuration of the absorbent core. About 2nd-5th embodiment, a different point from 1st Embodiment is mainly demonstrated, the same code | symbol is attached | subjected about the same point, and description is abbreviate | omitted. For the points not particularly mentioned, the description relating to the first embodiment is applied as appropriate.

  In the absorbent core 4 </ b> A according to the second embodiment, as shown in FIG. 6, vertical grooves 50 are formed in the skin contact surface of the central region 41 that forms the protruding portion 5. The longitudinal groove 50 is smaller in the basis weight and thickness of the absorbent core forming material than the high basis weight portion 42 in the central area 41 of the absorbent core, similarly to the transverse groove 44 along the width direction Y of the absorbent core. A low basis weight portion 48 is provided. Further, the vertical groove 50 extends through the projecting portion 5 and extends to a front end and a rear end region positioned forward or rearward from both longitudinal ends of the projecting portion 5. Further, the vertical groove 50 has a bottom portion located below the upper surface S <b> 2 of the lateral region 45 in each of the liquid excretion portion facing portion B and the rear portion C. Instead, in each of the liquid excretion part facing part B and the rear part C, the vertical groove 50 formed in the central area 41 is such that the bottom part is positioned above the upper surface S2 of the side area 45. Also good. Further, the depth of the longitudinal groove 50 may be different between the liquid excretion part facing part B and the rear part C. For example, the bottom part of the liquid excretion part facing part B is located above the upper surface of the side region 45. On the other hand, the bottom of the rear portion C may be positioned above the upper surface of the side region 45.

  The absorbent core 4A according to the second embodiment is provided with a non-breathable member that forms the longitudinal groove 50 in addition to the non-breathable member that forms the lateral groove 44 in the accumulation recess 55 of the stacking drum, The absorbent core 4 of the first embodiment can be manufactured in the same manner as described above.

  In the absorbent cores 4B and 4C in the third and fourth embodiments, as shown in FIGS. 7 and 8, the central region 41, the side regions 45 and 45, and the central region in the longitudinal direction, which form the protrusions 5, are provided. Longitudinal grooves 50 and 51 are provided in front and rear end regions outside the both ends of 41. Further, in each of the liquid excretion part facing part B and the rear part C, the lateral groove 44 formed in the central area 41 extends to each of the lateral areas 45 on both sides of the central area 41, and more specifically. Each lateral groove 44 extends over the entire region in the width direction Y of the absorbent core 4. Further, the vertical groove 50 formed in the central region 41 extends through the projecting portion 5 and extends to the front end and rear end regions located forward or rearward from the projecting portion 5. It extends over the entire length in the longitudinal direction X.

The bottom part of the longitudinal groove 50 in the third embodiment is located above the height position of the bottom part of the part located in the lateral region 45 of the lateral groove 44 in each of the liquid excretion part facing part B and the rear part C. . In the liquid excretion part facing part B, the bottom part of the vertical groove 50 in the fourth embodiment is located above the height of the bottom part of the part located in the lateral region 45 of the lateral groove 44, and in the rear part C, It is formed at substantially the same position as the height position of the bottom of the portion located in the lateral region 45 of the lateral groove 44.
Moreover, in the absorbent core 4B in 3rd Embodiment, the width | variety of the horizontal groove 44b formed in the back part C, ie, the dimension of the longitudinal direction of an absorptive main body, is the width | variety of the horizontal groove 44a formed in the liquid excretion part opposing part B. It is wider than the width. Moreover, as for the absorptive core 4C in 4th Embodiment, the position in the center part of the center area 41 is located ahead of the both ends of the width direction Y of an absorptive core as the horizontal groove 44b formed in the back part C. Thus, it has a lateral groove bent. Moreover, as for the absorptive core 4B of 3rd Embodiment, the thickness of the center area 41 is gradually reduced toward each of the side area 45 from the center part in the width direction X. As shown in FIG.

  In 2nd-4th embodiment, the vertical groove 50 in alignment with the longitudinal direction of the absorptive core 4 is formed in the center area 41 which has the protrusion part 5. As shown in FIG. Therefore, the protruding portion 5 and thus the raised portion 11 formed on the skin contact surface of the napkin are further easily deformed so as to conform to the wearer's body shape, and the fit to the unevenness of the body is further improved. Further, from the viewpoint of improving the liquid suction property in the thickness direction of the central region 41 and making it difficult for the liquid to remain on the skin contact surface, the longitudinal groove 50 is formed between the liquid excretion part facing part B and the rear part C. It is preferably formed at least in the rear part C, and more preferably formed so as to extend from the excretory part facing part B to a part of the rear part C.

In the third and fourth embodiments, the lateral groove 44 formed in the rear portion C is continuous from the central region 41 to the side region 45, and specifically, the width of the absorbent core 4 It extends over the whole area in the direction Y.
The lateral groove 44 is formed so that the lateral groove 44b formed in at least the rear part C of the excretion part facing part B and the rear part C is continuous from the central region 41 to the side region 45. This is preferable because the product is more flexible and easily bent. Here, with respect to the lateral groove 44, continuous from the central region to the lateral region means that the space in the lateral groove with the upper side released is not interrupted between the central region and the lateral region, and from the central region to the lateral region. It means to exist continuously over the area. In the napkin of the third and fourth embodiments, as shown in FIGS. 7B and 8B, the horizontal groove 44 intersects the vertical grooves 50 and 51 in a cross shape in plan view. In the case where all or part of the space in the other lateral groove exists on the extension of the space in the lateral groove on one side facing each other across the groove, the lateral groove is not interrupted at the intersection with the vertical groove And

  In the sanitary napkin of the fifth embodiment, the depth d2 of the lateral groove 44b formed in the rear part C in the absorbent core 4, 4A of the sanitary napkin of the first or second embodiment is set as the liquid excretion part facing part. The width of the horizontal groove 44b formed in the rear part C is made wider than the width of the horizontal groove 44a formed in the liquid excretion part facing part B, while making it equal to the depth d1 of the horizontal groove 44a formed in B. Is. As in the third embodiment and the fifth embodiment, the width of the lateral groove 44b formed in the rear part C is also made wider than the width of the lateral groove 44a formed in the liquid excretion part facing part B. The same effect as the embodiment is achieved. Regarding the fifth embodiment, the same configuration as that of the first or second embodiment, including a preferable configuration, can be adopted unless particularly described. When the width of the lateral groove 44b formed in the rear part C is larger than the width of the lateral groove 44a formed in the liquid excretion part facing part B, the width of the lateral groove 44b in the rear part C is equal to the lateral groove of the liquid excretion part facing part B. The ratio to 44a is preferably 125% or more, more preferably 150% or more, preferably 500% or less, more preferably 300% or less, and preferably 125% or more and 500% or less, More preferably, it is 150% or more and 300% or less.

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, although the longitudinal groove extended in the longitudinal direction of this absorptive core was formed in the absorptive core in the 2nd-4th embodiment, the longitudinal groove does not need to be formed. In addition, while the vertical groove in the central area is provided, the vertical groove in the lateral area may not be provided, and conversely, the vertical groove in the central area may not be provided while the vertical groove in the lateral area may be provided. .

Further, the lateral groove 44 that extends from the central region 41 to the side region 45 may be formed only in the liquid excretion part facing part B of the absorbent article, or may be formed only in the rear part C.
Further, the lateral grooves 44a and 44b formed in the central area 41 may be formed on the non-skin contact surface side instead of being formed on the skin contact surface side.

  Moreover, in the said embodiment, although the density of the high basic weight part 42 and the low basic weight part 43 was uniform, it replaces with this and the density of the high basic weight part 42 is made larger than the density of the low basic weight part 43. It is also possible. In this case, the central area 41 of the absorbent core 4 is pressed in the process of manufacturing the absorbent core 4. Under the present circumstances, the pressure by a press concentrates on the thick high basic weight part 42, and the thin low basic weight part 43 does not receive a pressure by a press and is not compressed. Thus, only the high basis weight part 42 is compressed, so that the high basis weight part 42 has a higher density of the absorbent member than the low basis weight part 43. For this reason, the body fluid taken in by the low basic weight part 43 becomes easy to move to the high basic weight part 42, and the absorptive core 4 is used effectively.

  The lateral region 45 of the absorbent core 4 is pressed in a step different from the step of pressing the central region 41. The pressure by the press is concentrated on the thick high basis weight portion 46, and the low low basis weight portion 47 is not compressed by the press and is not compressed. Thus, the high basis weight part 46 is designed so that the density of the absorbent member is higher than the low basis weight part 47 by compressing only the high basis weight part 42. In addition, the press process used in this process is a measure such as using a press roll cut into a shape corresponding to the central area 41 or a roll having a press portion only in a part corresponding to the side area 45 of the absorbent core 4. It is devised so that only the side region of the absorbent core 4 is pressed.

  Moreover, an absorptive core may consist only of fiber materials, such as a pulp fiber, and may contain both a fiber material and a super absorbent polymer. As the fiber material, various materials conventionally used for absorbent articles of absorbent articles such as sanitary napkins, panty liners, and disposable diapers can be used without particular limitation. For example, pulp fibers, rayon fibers, cotton Short fibers of cellulosic fibers such as fibers, short fibers of synthetic fibers such as polyethylene, and the like are used. These fibers can be used alone or in combination of two or more. Moreover, it is preferable that the fiber material is entirely or partly pulp fiber, and the ratio of the pulp fiber in the fiber material is preferably 50 to 100% by mass, more preferably 80 to 100% by mass, More preferably, it is 100 mass%. In addition to the superabsorbent polymer, the absorbent core may contain a deodorant or an antibacterial agent as necessary.

  In addition to the sanitary napkin, the absorbent article of the present invention may be other absorbent articles such as panty liners (origami sheets), incontinence pads, and disposable diapers. The description omitted in one embodiment described above and the requirements of only one embodiment can be applied to other embodiments as appropriate, and the requirements in each embodiment can be appropriately changed between the embodiments. Can be replaced with

This invention discloses the following absorbent articles further regarding embodiment mentioned above.
<1> An absorbent article provided with an absorbent core having a long shape in the front-rear direction of the absorbent article, wherein the absorbent core has a central region and side regions located on both sides thereof in the width direction. The central area has a protruding portion that protrudes upward from the upper surface of each side area, and the absorbent core has the central area and the side area formed integrally, The projecting portion is formed from the excretory portion facing portion disposed opposite to the liquid excretion portion of the wearer to the rear portion disposed rearward from the excretion portion facing portion, and the absorbent core includes the absorbent core. A plurality of transverse grooves are formed along the width direction, and the transverse grooves are formed by reducing the basis weight of the forming material of the absorbent core, and the transverse grooves formed in the rear part are opposed to the excretory part An absorbent article having a deeper depth than the lateral groove formed in the portion.

<2> An absorbent article having an absorbent core having a long shape in the front-rear direction of the absorbent article, wherein the absorbent core has a central region and side regions located on both sides thereof in the width direction. The central area has a protruding portion that protrudes upward from the upper surface of each side area, and the absorbent core has the central area and the side area formed integrally, The projecting portion is formed from the excretion portion facing portion disposed opposite to the liquid excretion portion of the wearer to the rear portion disposed behind the excretion portion facing portion, and the absorptivity is provided on the projecting portion. A plurality of transverse grooves along the width direction of the core are formed, the transverse grooves are formed by reducing the basis weight of the material forming the absorbent core, and the transverse grooves formed in the rear part are the excretory part An absorbent article having a width wider than the groove formed in the facing portion.
<3> The absorbent article according to <1> or <2>, wherein a longitudinal groove along the longitudinal direction of the absorbent body is formed in the protruding portion.
<4> The absorbent article according to any one of <1> to <3>, wherein the lateral groove formed in the rear portion is continuous from the central region to the lateral region.
<5> The lateral groove formed in the rear part has a bottom part in the central region in the width direction of the absorbent core or a bottom part in the entire region located below the upper surface of the side region, <1> The absorbent article according to any one of ~ <4>.
<6> The absorptivity according to <5>, wherein the lateral groove formed in the rear portion is configured such that the entire region of the central region in the width direction of the absorbent core is located below the upper surface of the side region. Goods.
<7> The ratio of the protrusion protruding from the upper surface of the lateral region to the total thickness of the central region is 20% or more and 90% or less in both the liquid excretion part facing part and the rear part. The absorbent article according to any one of <1> to <6>.
<8> The absorbent article according to any one of <1> to <7>, wherein the width of the protruding portion is 20% to 80% of the total width of the absorbent core.
<9> In the central region existing in the liquid excretion part facing part, the basis weight of the low basis weight part is a ratio of 20% or more and 90% or less of the basis weight of the high basis weight part of <1> to <8>. The absorbent article of any one.
<10> In the central region existing in the rear part, the basis weight of the low basis weight part is any one of <1> to <9>, wherein the ratio of the high basis weight part to the basis weight is 5% or more and 50% or less. Absorbent article as described in 1.

<11> The thickness of the low basis weight part in the liquid excretion part facing part is described in any one of <1> to <10>, in which the ratio to the thickness of the high basis weight part is 20% or more and 90% or less. Absorbent article.
<12> The absorbent article according to any one of <1> to <11>, wherein the thickness of the low basis weight part in the rear part is 5% or more and 50% or less with respect to the thickness of the high basis weight part. .
<13> The absorbent article according to any one of <1> to <12>, wherein the lateral groove is provided on a skin contact surface of the absorbent core.
<14> The absorbent article according to any one of <1> to <13>, wherein the longitudinal groove is provided on a skin contact surface of the absorbent core.
<15> The absorbent article according to any one of <1> to <14>, wherein the absorbent core has an uneven shape on the skin contact surface side and is flat on the non-skin contact surface side.
<16> The depth of the lateral groove formed in the rear part is a ratio of 125% or more and 400% or less of <1> to <15> with respect to the depth of the lateral groove formed in the liquid excretion part facing part. The absorbent article of any one.
<17> The depth of the transverse groove formed in the liquid excretion part facing part is any of <1> to <16>, in which the ratio of the central area in the liquid excretion part facing part is 10% or more and 80% or less Or an absorbent article according to claim 1.
<18> In the protruding part, the ratio of the height protruding from the upper surface of the lateral area to the total thickness of the central area is 20% or more and 90% or less in both the liquid excretion part facing part and the rear part. <1> -Absorptive article given in any 1 of <17>.
<19> The absorbent article according to any one of <1> to <18>, wherein the protrusion width is 20% or more and 80% or less with respect to the entire width of the absorbent core.
<20> The absorbent article according to any one of <1> to <19>, wherein the absorbent article is a sanitary napkin.

DESCRIPTION OF SYMBOLS 1 Sanitary napkin 2 Skin side sheet 2a Surface sheet 2b Solid guard formation sheet 3 Non-skin side sheet 4, 4A-4C Absorbent core 41 Central area 42 High basic weight part 43 Low basic weight part 44 Horizontal groove 44b Liquid excretion part opposing Lateral groove 44a Rear lateral groove 45 Side region S2 Upper side surface 5 Protruding portion 6 Absorbent body 7 Wing portion 8 Rear flap portion 11 Raised portion 50-51 Vertical groove 54 Condensation concave portion 55 Stack fiber drum 56 Accumulation Bottom surface of concave portion for use 56a Concave portion 57 Breathable member A Front portion B Liquid excretion portion facing portion C Rear portion

Claims (6)

An absorbent article having an absorbent core having a long shape in the front-rear direction of the absorbent article,
The absorbent core has, in the width direction, a central region and lateral regions located on both sides thereof, and the central region has a protruding portion that protrudes upward from the upper surface of each of the lateral regions. ,
In the absorbent core, the central region and the lateral region are integrally formed,
The projecting portion is formed from the excretion portion facing portion disposed to face the wearer's liquid excretion portion to the rear portion disposed behind the excretion portion facing portion,
A plurality of lateral grooves along the width direction of the absorbent core are formed in the protruding portion, and the lateral grooves are formed by reducing the basis weight of the absorbent core forming material,
The said horizontal groove formed in the said back part is an absorptive article deeper than the said horizontal groove formed in the said excretion part opposing part. An absorbent article having an absorbent core having a long shape in the front-rear direction of the absorbent article,
The absorbent core has, in the width direction, a central region and lateral regions located on both sides thereof, and the central region has a protruding portion that protrudes upward from the upper surface of each of the lateral regions. ,
In the absorbent core, the central region and the lateral region are integrally formed,
The protrusion is formed from an excretion part facing part disposed opposite to the liquid excretion part of the wearer to a rear part arranged behind the excretion part facing part,
A plurality of lateral grooves along the width direction of the absorbent core are formed in the protruding portion, and the lateral grooves are formed by reducing the basis weight of the absorbent core forming material,
The said horizontal groove formed in the said back part is an absorbent article wider than the said horizontal groove formed in the said excretion part opposing part.   The absorptive article according to claim 1 or 2 by which a longitudinal slot in alignment with a longitudinal direction of said absorber is formed in said projection part.   The absorbent article according to any one of claims 1 to 3, wherein the lateral groove formed in the rear portion is continuous from the central region to the lateral region.   The lateral groove formed in the rear portion is configured such that a part of the central region in the width direction of the absorbent core or a bottom portion in the entire region is located below the upper surface of the side region. The absorbent article of any one of Claims.   6. The absorbent article according to claim 5, wherein the lateral groove formed in the rear portion is such that the entire area of the central region in the width direction of the absorbent core is located below the upper surface of the lateral region.

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