JP2014097132A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article, hardly causing a wearer to feel a discomfort and restraining the occurrence of twisting and bending.SOLUTION: An absorbent article includes: a surface sheet 11; a rear surface sheet 12; and an absorber 20 interposed between the surface sheet and the rear surface sheet. A part where the surface sheet and the absorber overlap each other includes: an oblong annular pressing strip groove 31 formed by pressing the surface sheet and the absorber in the thickness direction; low pressing regions 14 located on both end parts in the longitudinal direction in an area 16 surrounded with the annular pressing strip groove and having a low pressing recessed part 32 formed by pressing the surface sheet and the absorber in the thickness direction; and an absorbing central region 17 located between the low pressing regions. The thickness of the bottom of the low pressing recessed part is larger than that of the bottom of the annular pressing strip groove.

Description

  The present invention relates to an absorbent article, and more particularly to absorbent articles such as light incontinence pads, panty liners, sanitary napkins, vaginal absorbent pads, urine absorbent pads, and disposable diapers.

  Conventionally, a surface sheet that is disposed on one side in the thickness direction and located on the wearer's skin facing surface side, a back sheet that is disposed on the other side in the thickness direction and located on the non-skin facing surface side of the wearer, Absorbent articles comprising an absorbent body interposed between back sheets are known.

  For example, in Patent Document 1, a leak-proof groove formed on both left and right side portions on the skin contact surface side and extending in the longitudinal direction, and a linear crimp formed by pressure-bonding a top sheet and an absorbent body between the leak-proof grooves. A sanitary napkin having a recess is disclosed.

  According to this sanitary napkin, it is possible to make it difficult for the absorbent body positioned between the leak-proof grooves to twist.

JP 2007-89907 A

  In the sanitary napkin disclosed in Patent Document 1, since the surface sheet and the absorbent body are pressure-bonded in the linear pressure-bonding concave portion, the unevenness generated in the surface sheet becomes large, giving an unpleasant sensation to the user. In addition, since the linear crimp recess is inserted into the absorber and crimped, the sanitary napkin becomes relatively hard, and the sanitary napkin is prevented from being deformed following the movement of the user. Or bend.

  This invention makes it a subject to provide the absorbent article by which generation | occurrence | production of the twist and the bending was suppressed, without producing unpleasant feeling to a wearer.

  In order to solve the above-mentioned problems, the present invention has a vertical direction, a horizontal direction, and a thickness direction that are orthogonal to each other, and is disposed on one side of the thickness direction and is located on the skin facing surface side of the wearer Assuming an absorbent article comprising a sheet, a back sheet disposed on the non-skin facing surface side of the wearer on the other side in the thickness direction, and an absorber interposed between the top sheet and the back sheet And

In this absorbent article, the present invention is a vertically long shape formed by squeezing the topsheet and the absorber in a direction from the topsheet to the backsheet at a portion where the topsheet and the absorber overlap. In the direction surrounded by the annular pressing groove and the both ends of the longitudinal direction in the region surrounded by the annular pressing groove, the top sheet and the absorber in the direction from the top sheet to the back sheet The absorption at the bottom of the low-pressure squeeze comprises a low-pressure squeeze region having a plurality of low-pressure squeeze regions formed by squeezing and an absorption central region located between the low-pressure squeeze regions formed at both ends The dimension in the thickness direction of the absorbent article is larger than the dimension in the thickness direction of the absorbent article at the bottom of the annular compressed groove.
Here, in the present application, when “the dimension in the thickness direction of the absorbent article at the bottom of the low pressure recessed portion”, “the dimension in the thickness direction of the absorbent article at the bottom of the annular pressing groove” and the like, It means the dimension from the top surface of the top sheet to the bottom of the back sheet, when the dimensions are measured with the top sheet side facing up. In the present application, unless otherwise specified, “the dimension in the thickness direction” means “the dimension in the thickness direction of the absorbent article”.

  In the absorbent article according to the present invention, since the depths of the plurality of low-pressure recessed portions formed at both ends in the longitudinal direction within the region surrounded by the annular compressed groove are relatively small, the unevenness generated in the topsheet is reduced. It is difficult for the user to feel uncomfortable. Furthermore, since the depth of the low pressing portion is relatively small, an increase in the hardness of the low pressing portion where the low pressing portion is formed is suppressed. Therefore, the deformation of the absorbent article following the movement of the user is not hindered. Thus, an absorbent article in which the occurrence of twisting and bending is suppressed without causing an unpleasant sensation to the user is provided.

The partially broken top view of the sanitary napkin of an example of the absorbent article which concerns on this invention. II-II sectional view taken on the line of FIG. III-III sectional view taken on the line of FIG. Explanatory drawing which shows the embossing process for manufacturing an absorbent article. The VV line expanded sectional view of FIG. The partially broken top view of the sanitary napkin of 2nd Embodiment. VII-VII line sectional drawing of FIG. Photograph of sample for thickness direction dimension evaluation. Measurement example of thickness direction dimension.

  An embodiment of a sanitary napkin which is an example of an absorbent article according to the present invention will be described with reference to the accompanying drawings.

<First Embodiment>
As shown in FIG. 1, a sanitary napkin 10 according to the present invention includes a top sheet 11 positioned on the skin facing surface side of the user, a back sheet 12 positioned on the non-skin facing surface side, the top sheet 11 and the back surface. And an absorbent body 20 interposed between the sheets 12. The sanitary napkin 10 has a vertically long shape that is long in the vertical direction Y, and is substantially symmetric with respect to the vertical center line and the horizontal center line. In addition, the sanitary napkin 10 according to the present embodiment includes a pair of wing portions 15 extending in a convex shape toward the laterally outer side at the longitudinal center portion of the side edge.

  The top sheet 11 and the back sheet 12 are sheets of the same shape and the same size, and both the dimensions in the horizontal direction X and the vertical direction Y are larger than those of the absorbent body 20, and include a peripheral edge 13 that extends around the absorbent body 20. . The top sheet 11 and the back sheet 12 are joined to each other at a peripheral edge portion 13 by a known means such as a hot melt adhesive (not shown) or heat welding. In FIG. 1, the joint 18 shown by hatching is joined.

The top sheet 11 has liquid permeability and is made of a material containing a thermoplastic synthetic resin. For example, a fiber nonwoven fabric such as an air-through fiber nonwoven fabric, a point bond nonwoven fabric, or a spun bond nonwoven fabric can be suitably used. Examples of the thermoplastic synthetic resin include, but are not limited to, olefin polymers such as ethylene and propylene, or polyethylene terephthalate. For example, the top sheet 11 has a mass of about 10 to 50 g / m ² and a thickness of about 0.5 to 2.0 mm.

The back sheet 12 is made of a material that includes a liquid-impervious or liquid-impervious thermoplastic synthetic resin, and for example, a plastic film or a laminate of a plastic film and a fiber nonwoven fabric can be suitably used. Examples of the fiber nonwoven fabric include, but are not limited to, a spunbond / meltblown / spunbond (SMS) fiber nonwoven fabric, an air-through fiber nonwoven fabric, a point bond fiber nonwoven fabric, and a spunbond fiber nonwoven fabric. The above-mentioned synthetic resin can be used for the thermoplastic synthetic resin. For example, the back sheet 12 has a mass of about 10 to 50 g / m ² and a thickness of about 0.1 to 1.0 mm. The top sheet 11 and the back sheet 12 are preferably made of a material containing the same kind of resin.

  The wing portion 15 of this embodiment is formed integrally with the top sheet 11 and the back sheet 12. However, the wing portion 15 can be provided separately from the top sheet 11 and the back sheet 12. In this case, the wing part 15 is formed from the same or different sheet material as the top sheet 11 or the back sheet 12 and joined to both side edges in the longitudinal direction of the absorber 20 by a known means such as hot melt adhesive or heat welding. can do.

  The absorbent body 20 has a substantially rectangular shape, and is located between the first sheet 21 located on the top sheet 11 side, the second sheet 22 located on the back sheet 12 side, and the first sheet 21 and the second sheet 22. It has a body fluid-absorbing core material 23 interposed, and has a substantially uniform thickness. The first sheet 21 and the second sheet 22 have substantially the same shape and size, and their peripheral portions are joined to each other by a known means such as hot melt adhesive or heat welding.

The 1st sheet | seat 21 can be formed using a liquid-permeable fiber nonwoven fabric, tissue paper, and an airlaid sheet | seat. When using a fiber nonwoven fabric, fiber nonwoven fabrics, such as air through, a spun bond, and SMS, can be used. The 1st sheet | seat 21 of this embodiment consists of an air through fiber nonwoven fabric. The air-through fiber nonwoven fabric is preferable because liquid return to the skin can be reduced. The mass of the 1st sheet | seat 21 is about 10-60 g / m < ² >, for example. The first sheet may not be used. When the first sheet is not used, the top sheet 21 directly covers the core member 23.

The second sheet 22 may be either a liquid-permeable sheet or a liquid-impermeable sheet, and can be formed using a fiber nonwoven fabric, tissue paper, or an airlaid sheet. When using a fiber nonwoven fabric, fiber nonwoven fabrics, such as air through, a spun bond, and SMS, can be used. The 2nd sheet | seat 22 of this embodiment consists of a SMS fiber nonwoven fabric. The mass of the second sheet 22 is, for example, about 10 to 60 g / m ² .

  The core material 23 can be constituted by one or both of known absorbent polymer particles and absorbent fibers. Examples of absorbent polymers include, but are not limited to, starch-based, acrylic acid-based, and amino acid-based polymers. Examples of absorbent fibers include, but are not limited to, natural pulp fibers such as wood fluff pulp, regenerated fibers such as rayon staples, and mixtures thereof.

  The topsheet 11 is formed in each of the vertically long annular pressing grooves 31 formed at the portion where the topsheet 11 and the absorbent body 20 overlap, and both ends in the longitudinal direction Y in the region 16 surrounded by the annular pressing grooves 31. A low-pressure squeezing region 14 having a plurality of low-pressure squeezing recesses 32 and an absorption central region 17 located between the low-pressure squeezing regions 14 are provided. The annular pressing groove 31 and the low pressure recessed portion 32 are formed by pressing the top sheet 11 and the absorbent body 20 in the direction from the top sheet 11 to the back sheet 12. As will be described later, the annular pressing groove 31 and the low pressing recess 32 can be formed by embossing. In addition, in FIG. 1, illustration of the pressing mark formed in the core material 23 is abbreviate | omitted. Moreover, although the low pressing recessed part 32 is illustrated by the small diameter circle, the shape of the low pressing recessed part 32 is not limited to a circle.

  The region 16 surrounded by the annular compressed groove 31 is located inside the outer peripheral edge of the portion where the topsheet 11 and the absorbent body 20 overlap. The annular compressed groove 31 prevents the body fluid excreted in the region 16 from leaking out. In the region 16 surrounded by the annular squeezing groove 31, the absorption central region 17 located between the pair of low-pressure squeezing regions 14 formed at both ends is located at the substantially central portion of the sanitary napkin 10 and is attached. Opposite the user's excretory part.

  In the present embodiment, the annular compressed groove 31 has a pair of constricted portions 36 that are constricted toward the inner side in the lateral direction of the sanitary napkin 10 at both boundary portions of the pair of low-pressure squeezed regions 14 and the absorption central region 17. The pair of constricted portions 36 has an effect of raising the absorption central region 17 located at the central portion of the sanitary napkin 10 to the user side and reducing leakage at the time of wearing. On the other hand, the low-pressure squeezed regions 14 located on both outer sides in the longitudinal direction Y of the constricted portion 36 are kept flat and can be deformed following the movement of the user's body.

  As shown in FIG. 2, the low-pressure squeezed recess 32 and the annular squeeze groove 31 are formed by squeezing until they enter the core 23, and the dimension in the thickness direction Z at the bottom 33 of the low-pressure squeezed recess 32 is It is larger than the dimension in the thickness direction Z at the bottom 34 of the annular compressed groove 31. The dimension in the thickness direction Z of the bottom 33 of the low pressing recess 32 is 50% or more of the dimension in the thickness direction Z around the low pressing recess 32, and preferably 60% or more. The dimension in the thickness direction Z of the bottom 34 of the annular compressed groove 31 is less than 50% of the dimension in the thickness direction Z around the annular compressed groove 31, and there is no particular lower limit, and embossing is performed. The dimension in the thickness direction Z can be reduced as much as possible. As an example, when the dimension in the thickness direction Z of the sanitary napkin 10 in which the low-pressure squeezed recess 32 and the annular squeeze groove 31 are formed is substantially uniform, The dimension is about 2/3 of the dimension in the thickness direction Z around the low-pressure recessed portion 32, and the dimension in the thickness direction Z of the bottom 34 of the annular compressed groove 31 is the thickness around the annular compressed groove 31. It is about 1/3 of the dimension in the length direction Z.

  In the bottom part 33 of the low pressure recessed part 32 and the bottom part 34 of the annular pressing groove 31, the 1st sheet | seat 21 and the surface sheet 11 are integrated by pressing. In other words, the first sheet 21 and the top sheet 11 are also continuous without breaking at the bottom 33 of the low pressure recessed portion 32 and the bottom 34 of the annular compressed groove 31. If the top sheet 11 is peeled off from the first sheet 21 during use of the sanitary napkin 10, there is a risk that the product will be twisted. Thus, the first sheet 21 and the top sheet 11 are integrated by pressing. Therefore, it is possible to prevent the surface sheet 11 from being peeled off by friction caused by the movement of the user. The first sheet 21 and the surface sheet 11 can be integrated by a known means such as heat welding during embossing.

  As described above, since the compression depth of the low-pressure recessed portion 32 of the present invention is relatively small, the unevenness generated in the surface sheet 11 during embossing is also relatively small, resulting in an unpleasant sensation for the user. Hateful. Moreover, as a result of suppressing the increase in the hardness of the low pressing area 14 in which the low pressing recessed part 32 is arrange | positioned because the depth of the low pressing recessed part 32 is relatively small, the absorbent article which followed the movement of the user Will not hinder the deformation. Moreover, since the low pressing recessed part 32 of this invention squeezes and forms until it penetrates into the core material 23 of the absorber 20, the communication with the core material 23 is high, and a bodily fluid tends to osmose | permeate the absorber 20. FIG. Furthermore, in the core material 23, the density of the pulp pulverized body around the low-pressing recessed portion 32 is higher than that in the periphery, and the absorbed liquid is easily retained. As a result, the absorbability of the sanitary napkin 10 is improved. Moreover, also in the annular pressing groove 31, the density of the pulp pulverized body becomes higher than that of the periphery, and the absorbability is improved.

  As shown in FIG. 1, in the present embodiment, a plurality of low-pressure depressions 32 are arranged on virtual lattice lines G that are inclined with respect to the vertical direction Y. More specifically, the plurality of low-pressure squeezed recesses 32 are provided between the constricted part 36 and the annular squeezed groove 31 at both ends in the longitudinal direction Y in the region 16 surrounded by the annular squeezed groove 31, that is, in the low-pressure squeezed region 14. The compressed depression 32 is also formed in a portion that is outside in the lateral direction X with respect to the most constricted portion of the constricted portion 36 that is arranged in the lateral direction X. Since the sanitary napkin 10 is applied with a force in the lateral direction X from the user's legs toward the inside of the sanitary napkin 10 when worn, wrinkles parallel to the longitudinal direction Y are likely to enter. As a result of disposing wrinkles parallel to the vertical direction Y by disposing the plurality of low-pressure depressions 32 on the virtual lattice line G inclined with respect to the vertical direction Y, the result of preventing irregular deformation of the product It is possible to improve the feeling of use and prevent leakage.

  In the present embodiment, since the first sheet 21 and the top sheet 11 are compressed and integrated until they enter the core member 23 while being stretched, the first sheet between the adjacent low-pressure recessed portions 32 on the virtual lattice line G. 21 and the topsheet 11 are drawn into the low-pressure squeezed recess 32. For this reason, tension is applied to the first sheet 21 and the top sheet 11 between the adjacent low pressing recesses 32, and as shown in FIG. Get smaller. That is, a slight depression is generated along the virtual lattice line G in which the low-pressure depression 32 is disposed. This means that along the virtual lattice line G inclined with respect to the longitudinal direction Y, a region where the tension is higher than the surroundings is formed. By the site | part with high tension formed along the virtual lattice line G inclined with respect to the vertical direction Y, it is suppressed that a wrinkle parallel to the vertical direction Y enters, and peeling of the surface sheet 11 is prevented. The generation of such depressions along the virtual grid line G depends on various factors such as the physical properties of the first sheet 21 and the top sheet 11, the distance between the low-pressure depressions 32, the depth of the low-pressure depressions 32, and the like. However, the above-described effects can be obtained as long as tension is applied to the first sheet 21 and the top sheet 11 between the adjacent pressed depressions 32 on the virtual lattice line G regardless of the presence or absence of such depressions. .

  Next, with reference to FIG. 4, the embossing process which is a part of manufacturing method of the sanitary napkin 10 which concerns on this invention is demonstrated. In FIG. 4, illustration of auxiliary rolls and the like is omitted, MD indicates a machine direction, CD indicates a cross direction orthogonal to the machine direction MD, and VD is an upper and lower direction orthogonal to the machine direction MD and the cross direction CD, respectively. Indicates direction. The machine direction MD corresponds to the vertical direction Y, the cross direction CD corresponds to the horizontal direction X, and the vertical direction VD corresponds to the thickness direction Z.

  In the embossing process, while the sheet member 50 having the top sheet 11, the back sheet 12, and the absorbent body 20 interposed between the two sheets 11 and 12 is continuously run in one direction, that is, the machine direction MD, The top sheet 11 is embossed by being sandwiched between a pair of embossing rolls 40. At this time, the sheet member 50 is caused to travel such that a portion where the topsheet 11 and the absorbent body 20 overlap faces upward. The absorbent body 20 includes a body fluid-absorbing core member 23 interposed between the first sheet 21 and the second sheet 22 and is formed to have a substantially uniform thickness.

  The pair of embossing rolls 40 includes a first roll 44 and a second roll 45, and the first roll 44 is positioned above the second roll 45. The rotation shaft 44a of the first roll 44 and the rotation shaft 45a of the second roll 45 are parallel to each other. The first roll 44 is a roll that is in contact with the top sheet 11 during embossing, and is disposed inside the annular first protrusion 46 and the annular first protrusion 46 for forming the annular compressed groove 31, A plurality of second protrusions 47 for forming the low-pressure squeezed recesses 32 extend from the peripheral surface 44z toward the outside in the diameter direction. As shown in FIG. 5, the height of the first protrusion 46 from the peripheral surface 44 z is higher than that of the second protrusion 47. Moreover, the 1st roll 44 is comprised so that control of the surface temperature is possible by a temperature control means (not shown). The second roll 45 is located on the back sheet 12 side. Further, the peripheral surface 45z of the second roll 45 has a constant distance from the axis of the rotation shaft 45a and is flat.

  When embossing, the clearance between the first roll 44 and the second roll 45 can be squeezed at a desired depth at the portion where the top sheet 11 and the absorbent body 20 are overlapped by the first protrusion 46 and the second protrusion 47. Adjust as follows. As an example, the clearance is adjusted within a range in which the gap between the first protrusion 46 and the second roll 45 is greater than 0 mm and approximately 2 mm or less, and the compression depth is set to a desired value. Further, the sheet member 50 is machined so that the portion where the topsheet 11 and the absorber 20 overlap and the position of the first protrusion 46 and the second protrusion 47 rotating in the circumferential direction of the first roll 44 are synchronized. Drive continuously in direction MD.

  Accordingly, the sheet member 50 is sandwiched between the first and second rolls 44 and 45 with a certain clearance, and the pattern of the first protrusion 46 and the second protrusion 47 formed on the first roll 44 is changed to the sheet member. 50, the annular pressing groove 31 and the plurality of low-pressure recessed portions 32 can be formed in a portion where the topsheet 11 and the absorbent body 20 overlap. Further, when embossing is performed, the temperature of the first roll 44 is set to a temperature at which the top sheet 11 and the first sheet 21 can be thermally welded, for example, about 80 to 100 ° C., whereby the sheet member 50 is removed from the top sheet 11. When squeezing in the direction toward the back sheet 12, the top sheet 11 and the first sheet 21 can be integrated by heat welding. After this embossing process, the sanitary napkin 10 having a predetermined shape is cut out from the sheet member 50.

  In the manufacturing method of the present invention, the first protrusions 44 and the second protrusions 47 having different clearances from the peripheral surface 44z of the first roll 44 with the clearance between the first roll 44 and the second roll 45 being constant are used. Embossing. As a result, the dimension in the thickness direction Z at the bottom 33 of the low-pressure depression 32 formed by the second protrusion 47 having a relatively low height from the peripheral surface 44z of the first roll 44 is the first protrusion. It becomes larger than the dimension of the thickness direction Z in the bottom part 34 of the annular pressing groove 31 formed of the part 46. FIG. In other words, the annular pressing groove 31 is squeezed deeper than the low pressure recess 32. That is, the annular pressing groove 31 is compressed at a higher compression rate than the low-pressure pressing recess 32. Thereby, the density of the core material 23 of the part in which the annular pressing groove 31 is formed becomes higher than the density of the core material 23 of the part in which the low pressure recessed part 32 is formed. When the density of the core material 23 is high, the diffusion rate of body fluid is improved. On the other hand, when the density of the core material 23 is relatively low, although it depends on the degree, the diffusion rate of the body fluid decreases, but the volume of the body fluid that can be absorbed and held increases.

  Next, an example of a method for evaluating the dimension in the thickness direction Z of the sanitary napkin 10 according to the present invention will be described. In this evaluation example, it has an annular first protrusion 46 for forming the annular pressing groove 31 and a plurality of second protrusions 47 for forming the low pressure recess 32, and the first protrusion 46. The sanitary napkin 10 produced using the first roll 44 having a height from the peripheral surface 44z of about 2 times the height of the second protrusion 47 was used. The sanitary napkin 10 used in this evaluation has a substantially uniform thickness.

  From this sanitary napkin 10, a portion including the low-pressure squeezed recess 32 and the annular squeeze groove 31 was cut out to prepare an evaluation sample shown in FIG. The surface having the low-pressure squeezing recess 32 and the annular squeezing groove 31 of the sample for evaluation is attached on a horizontal plane, and the non-contact type keyence shape measuring device KS-1100 is used with this plane as a reference plane. Using, the height of the surface of each part of the sanitary napkin 10 with respect to the reference surface was measured. In this evaluation, the height of the surface of the sanitary napkin 10 relative to the reference surface is referred to as the “apparent thickness” of the sanitary napkin 10, and by comparing the apparent thickness, the dimension in the thickness direction Z of the sanitary napkin 10 is determined. evaluated. Here, the value of the apparent thickness of the annular compressed groove 31 and the low-pressure recessed portion 32 was set to the minimum apparent thickness value in the portion where they were formed by pressing.

  As shown in FIG. 8, the annular pressing groove 31 formed in the top sheet 11 of the sample for evaluation has a bottom pressing portion 31a on the bottom surface. That is, the bottom surface of the annular pressing groove 31 has irregularities, and the dimension in the thickness direction Z is the smallest in the bottom pressing portion 31a. Moreover, the low pressing recessed part 32 formed in the surface sheet 11 of the sample for evaluation is arrange | positioned on the virtual lattice line (not shown) inclined with respect to the vertical direction of the sanitary napkin 10. FIG.

  FIG. 9 shows the result of measuring the apparent thickness in the frame line shown in FIG. 8 using the keyence shape measuring instrument KS-1100. FIG. 9A is a diagram showing the distribution of the apparent thickness when the sample for evaluation is viewed from above by the change in color tone, and FIG. 9B is an apparent view in the section IXb-IXb of FIG. 9A. It is a measurement result of thickness. As shown in FIG. 9 (b), in the sample for evaluation, the apparent thickness of the low pressure recessed portion 32 of the sanitary napkin 10 is about 1900 μm, and the apparent thickness of the annular compressed groove 31 (bottom compressed portion 31a) is about 1000 μm. The apparent thickness of the low pressure recessed portion 32 is larger than the apparent thickness of the bottom portion of the annular compressed groove 31. In other words, the pressing depth of the low-pressure pressing recess 32 is smaller than the pressing depth of the annular pressing groove 31.

  In this way, the dimension in the thickness direction Z at the bottom of the low-pressure squeezed recess 32 and the dimension in the thickness direction at the bottom of the annular squeeze groove 31 can be evaluated. In this evaluation example, the apparent thickness of the sanitary napkin 10 in a portion that is not squeezed by the first and second protrusions 46 and 47 in embossing is about 2500 to 3000 μm. Therefore, the apparent thickness of the low-pressure recessed portion 32 is 50% or more of the apparent thickness of the sanitary napkin 10, and the apparent thickness of the annular compressed groove 31 is less than 50% of the apparent thickness of the sanitary napkin 10. ing. In the example shown in FIG. 9B, the apparent thickness of the sanitary napkin 10 around the low-pressure recessed portion 32 and the annular compressed groove 31 is about 2500 to 2700 μm, whereas the sanitary napkin 10 The apparent thickness at the end is about 3000 μm. As for this, the sheet | seat member (1st sheet | seat 21 and surface sheet 11) around the low pressing recessed part 32 and the annular pressing groove 31 is drawn in in the low pressing recessed part 32 and the annular pressing groove 31 by the pressing at the time of embossing. This is because.

Second Embodiment
A second embodiment of the present invention will be described with reference to FIG. Since the basic configuration of the second embodiment is the same as that of the sanitary napkin 10 of the first embodiment, only differences will be described below. In addition, in FIG. 6, illustration of the pressing mark formed in the core material 23 is abbreviate | omitted.

  The sanitary napkin 10 according to this embodiment is an absorption center located between the low-pressure squeezed region 14 formed at both ends in the longitudinal direction Y in the region 16 surrounded by the annular compressed groove 31 and the low-pressure squeezed region 14. A pair of curvilinear lateral pressing grooves 30 that are spaced apart from the annular pressing groove 31 and extend in the lateral direction are provided on the absorption central area 17 side of both boundaries with the area 17. The horizontal pressing groove 30 is formed by pressing the top sheet 11 and the absorbent body 20 in the direction from the top sheet 11 to the back sheet 12 until entering the core member 23, similarly to the annular pressing groove 31. . Further, as shown in FIG. 7, the dimension in the thickness direction Z at the bottom 33 of the low-pressure squeezing recess 32 is larger than the dimension in the thickness direction Z at the bottom 35 of the lateral pressing groove 30. Although the dimension of the thickness direction Z in the bottom part 35 of the horizontal pressing groove 30 can be made substantially the same as the dimension of the thickness direction Z in the bottom part 34 of the annular pressing groove 31, it is not limited to this.

  During use of the sanitary napkin 10, a lateral X force is applied from both legs of the user toward the inside of the sanitary napkin 10. Since the sanitary napkin 10 which concerns on 2nd Embodiment is equipped with the horizontal pressing groove | channel 30 extended in the shape of a line in the lateral direction inside the annular pressing groove 31 in addition to the annular pressing groove 31, the sanitary napkin 10 It is possible to resist the force in the lateral direction X applied at the time of wearing. Thereby, a deformation | transformation of the sanitary napkin 10 is suppressed and twist is prevented. Moreover, since the absorption center area 17 which contact | abuts a user's excretion part is surrounded by a pair of horizontal pressing groove 30 extended in the horizontal direction X, and the both sides of the annular pressing groove 31 extended in the vertical direction Y. Even when a force in the lateral direction X is applied, deformation of the absorption central region 17 is effectively suppressed. As a result, the state where the absorption central region 17 is in contact with the excretion portion of the user is easily maintained. Moreover, since the density of a pulp grinding | pulverization body becomes high compared with a periphery also in the horizontal pressing groove 30, similarly to the annular pressing groove 31, a bodily fluid absorbency improves.

  Similarly to the first embodiment, the low-pressure squeezing recess 32 disposed in the low-pressure squeezing region 14 is formed by integrating the first sheet 21 and the top sheet 11 by squeezing, so that friction due to the movement of the user is caused. Since the surface sheet 11 is prevented from being peeled off, and the unevenness generated in the surface sheet 11 is relatively small, it is difficult to cause an unpleasant sensation to the user. Furthermore, since the increase in the hardness of the low pressure area 14 is suppressed, the deformation of the absorbent article following the user's movement is not hindered, and wrinkles parallel to the vertical direction Y are suppressed. As a result of preventing irregular deformation of the product, it is possible to improve the feeling of use and prevent leakage. In addition to these, in the present embodiment, even when deformation occurs in the low pressure squeezing region 14, the horizontal squeezing groove 30 provided at the boundary between the low pressure squeezing region 14 and the absorption central region 17 causes the absorption central region 17 to It is possible to prevent the deformation from propagating.

  As a modified example of the present embodiment, the low-pressure recessed portion 32 can be disposed between the pair of lateral compressed grooves 30, that is, the absorption central region 17. The absorption center region 17 is a portion that abuts the user's excretion portion, and by arranging the low-pressure squeezed recess 32 in the absorption center region 17, the communication between the topsheet 11 and the absorber 20 is improved, and the absorber 20. The transfer of body fluids to is promoted. In addition, the sanitary napkin 10 of this embodiment embosses using the roll (not shown) which added the projection part for forming the horizontal pressing groove 30 to the 1st roll 44 shown in Embodiment 1. FIG. It can manufacture by processing.

  Although this invention was demonstrated based on embodiment, this invention is not limited to this, A various change can be implemented. For example, although the case where the annular compressed groove 31 has the constricted portion 36 has been described, the constricted portion 36 may not be provided in the annular compressed groove 31. Moreover, although the case where the low pressing recessed part 32 is arrange | positioned on the virtual lattice line G inclined with respect to the said vertical direction was demonstrated, if it is the arrangement | positioning which can suppress a wrinkle parallel to the vertical direction Y, for example, Penrose Another arrangement such as a tile format may be employed. Alternatively, instead of the configuration in which the core material 23 is interposed between the first and second sheets 21 and 22, the core material 23 can be covered with tissue paper, or the first sheet 21 can be omitted. . Moreover, although the case where the thickness of the absorber 20 was uniform was demonstrated, the dimension of the thickness direction Z of the absorber 20 of the part corresponded to the absorption center area 17 is enlarged, and it adheres to a user's excretion part. You can also. The present invention is not limited to the sanitary napkin 10, and may be applied to absorbent articles such as light incontinence pads, panty liners, vaginal absorption pads, urine absorption pads, and disposable diapers.

  For the members constituting the sanitary napkin 10, unless otherwise specified, in addition to the materials described in this specification, known materials usually used in this kind of field are used without limitation. Can do. In addition, the terms “first” and “second” used in this specification are simply used to distinguish similar elements, positions, and the like.

  The disclosure relating to the present invention described above can be summarized at least in the following matters.

  A top sheet that has a longitudinal direction, a lateral direction, and a thickness direction orthogonal to each other, is disposed on one side of the thickness direction and is located on the side facing the wearer's skin, and is disposed on the other side of the thickness direction. An absorbent article comprising a back sheet positioned on the non-skin facing surface side of the wearer and an absorbent body interposed between the top sheet and the back sheet, wherein the top sheet and the absorbent body overlap each other. In the part, the vertically long annular pressing groove formed by compressing the top sheet and the absorber in the direction from the top sheet to the back sheet, and the vertical in the region surrounded by the annular pressing groove A low-pressure squeezing region having a plurality of low-pressure squeezing recesses formed by squeezing the top sheet and the absorbent body in a direction from the top sheet to the back sheet, respectively, Formed in the part An absorption center region located between the low-pressure squeezing regions, and the thickness-wise dimension of the absorbent article at the bottom of the low-pressure squeezing recess is the above-mentioned of the absorbent article at the bottom of the annular squeeze groove The said absorbent article characterized by being larger than the dimension of the thickness direction.

  The invention disclosed above can include at least the following embodiments.

(1) The plurality of low-pressure squeezed recesses are arranged on virtual lattice lines configured by a plurality of lines that are inclined with respect to the longitudinal direction and intersect each other.
(2) In the region surrounded by the annular compressed groove, the annular compressed groove on the absorption central region side of the boundary between the low pressure region and the absorption central region formed at both ends. A pair of linear or curved lateral pressing grooves that are spaced apart from each other and extend in the lateral direction from each other, and the dimension in the thickness direction of the absorbent article at the bottom of the low-pressure pressing recess is the lateral pressing It is larger than the dimension in the thickness direction of the absorbent article at the bottom of the groove.
(3) In the said area | region enclosed by the said annular pressing groove, it has the said low pressing recessed part also between a pair of said horizontal pressing groove.
(4) A pair of constricted portions in which the annular compressed groove is constricted toward the inner side in the lateral direction of the absorbent article at both boundary portions between the low-pressure squeezed region and the absorption central region formed at both ends. Have
(5) In the said low pressing area, it has the said low pressing recessed part also in the part which becomes the said horizontal direction outer side with respect to the most narrowed part of the said narrowed part tied toward the said horizontal direction inner side.

  Moreover, the indication regarding the method of manufacturing the absorbent article of this invention can be summarized to the following matter at least.

  A sheet member having a top sheet, a back sheet, and an absorber interposed between the top sheet and the back sheet is continuously run in one direction, and sandwiched between a pair of embossing rolls. A step of embossing the top sheet, the peripheral surface of one of the pair of embossing rolls is flat, and the other roll extends from the peripheral surface toward the outside in the diameter direction of the roll. A first protrusion for forming the annular squeezing groove and a plurality of second protrusions for forming the low-pressure depression, the first protrusion being more circumferential than the second protrusion. A manufacturing method characterized in that the height from the surface is high.

10 Sanitary napkins (absorbent articles)
DESCRIPTION OF SYMBOLS 11 Top sheet 12 Back sheet 14 Low pressure pressing area 16 Area 17 Central absorption area 20 Absorber 21 1st sheet 22 2nd sheet 23 Core material 30 Horizontal pressing groove 31 Annular pressing groove 32 Low pressure depression 33 Bottom part of a low pressure depression 34 Bottom 35 of the annular compressed groove 35 Bottom 36 of the horizontal compressed groove 36 Constricted portion 40 Embossing roll 44z Peripheral surface 45z Peripheral surface 46 First protrusion 47 Second protrusion 50 Sheet member G Virtual lattice line X Horizontal direction Y Vertical Direction Z Thickness direction

Claims (7)

A top sheet that has a longitudinal direction, a lateral direction, and a thickness direction orthogonal to each other, is disposed on one side of the thickness direction and is located on the side facing the wearer's skin, and is disposed on the other side of the thickness direction An absorbent article comprising a back sheet positioned on the non-skin facing surface side of the wearer, and an absorbent body interposed between the top sheet and the back sheet,
In the part where the topsheet and the absorbent body overlap, a vertically long annular squeezed groove formed by squeezing the topsheet and the absorbent body in the direction from the topsheet to the backsheet;
Plural formed by squeezing the top sheet and the absorbent body in the direction from the top sheet to the back sheet, located at both ends of the longitudinal direction in the region surrounded by the annular compressed groove. A low-pressure squeezing region having a low-pressure squeezing recess,
An absorption central region located between the low-pressure squeezed regions located at both ends,
The absorbent article characterized in that a dimension in the thickness direction of the absorbent article at the bottom of the low-pressure depression is larger than a dimension in the thickness direction of the absorbent article at the bottom of the annular pressing groove. .   The absorptive article according to claim 1 in which said a plurality of low pressing depressions are arranged on a virtual lattice line constituted by a plurality of lines which incline and intersect mutually with respect to said longitudinal direction. In the region surrounded by the annular compressed groove, the absorption center region side of the boundary between the low pressure region and the absorption central region formed at both ends is separated from the annular compressed groove. And further comprising a pair of linear or curved lateral pressing grooves extending in the lateral direction with respect to each other,
The dimension of the said thickness direction of the said absorbent article in the said bottom part of the said low pressing recessed part is larger than the dimension of the said absorbent article in the thickness direction in the bottom part of the said horizontal pressing groove. Absorbent articles.   The absorptive article according to claim 3 which has said low-pressure pressing crevice between said pair of horizontal pressing grooves in said field surrounded by said annular pressing groove.   The annular pressing groove has a pair of constricted portions that are constricted toward the inner side in the lateral direction of the absorbent article at both boundary portions between the low-pressure squeezed region and the absorption central region formed at the both ends. The absorptive article according to any one of claims 1 to 4.   6. The absorbent article according to claim 5, wherein, in the low-pressure squeezing region, the low-pressure squeezed concave portion is also provided in a portion that becomes the outer side in the lateral direction with respect to the most constricted portion of the constricted portion that is bound toward the inner side in the horizontal direction. . It is a manufacturing method of the absorptive article according to claim 1,
A sheet member having a top sheet, a back sheet, and an absorber interposed between the top sheet and the back sheet is continuously run in one direction, and sandwiched between a pair of embossing rolls. And embossing the top sheet,
The peripheral surface of one roll of the pair of embossing rolls is flat,
A plurality of second protrusions for forming the first pressing part for forming the annular pressing groove and the low pressing pressing part, the other roll extending from the peripheral surface toward the outer side in the diameter direction of the roll. The manufacturing method is characterized in that the first protrusion is higher in height from the peripheral surface than the second protrusion.