JP2017217257A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article excellent in wearing feeling and in which absorption performance is secured.SOLUTION: An absorbent article 1 comprises: a top sheet 2; a back sheet 3; and an absorbent core 4 provided therebetween. The absorbent core 4 contains at least pulp fibers, and the absorbent core is formed into a cornice shape comprising crest parts 5A and trough parts 5B alternately, in a cross direction y, with the top sheet 2. The top sheet 2 comprises a center flap 7 which is tilted outward of a width direction x, and is overlapped to at least a part of the absorbent core 4 formed into a cornice shape, on each of one side and the other side of the width direction x.SELECTED DRAWING: Figure 1

Description

  The present invention relates to absorbent articles such as disposable diapers, urine pads (including incontinence pads), and sanitary napkins.

  Conventionally, various absorptive articles in which the shape of the absorbent body or the absorbent core (absorbent core) has been devised are known. For example, Patent Document 1 discloses an absorbent pad including a liquid-permeable top sheet, a liquid-impervious back sheet, and an absorbent body interposed therebetween, and the absorbent body has a mountain fold and a valley fold. The ridges and ridges, which are formed by repeatedly forming the bellows and valleys of the absorber, extend in the front-rear direction connecting the wearer's front side and back side. An existing absorbent pad is disclosed. Patent Document 2 discloses an absorptive article having an absorbent core between a top sheet and a back sheet, and an abdominal panel, a crotch panel, a back panel, and an outer edge panel in which the absorbent core can be bent between panels. An absorbent article is disclosed in which each panel is configured to be able to bend in the front, back, left, and right directions independently within each panel surface. Patent Document 3 discloses an absorbent article having a vertically long absorbent main body provided with a top sheet, a back sheet, and an absorbent body interposed between the two sheets. An absorbent article is disclosed in which a plurality of transverse grooves extending in the longitudinal direction are provided at a predetermined pitch in the longitudinal direction.

JP 2014-83277 A JP 2004-49507 A JP 2007-14635 A

  The absorbent articles disclosed in Patent Documents 1 to 3 are devised in three-dimensional shapes of the absorbent body and the absorbent core in order to enhance the fit in the wearer's crotch or to increase the absorbent capacity. However, the absorbent article is required to improve the feeling of wearing and the absorption ability in this way. This invention is made | formed in view of the said situation, The objective is to provide the absorbent article which was excellent in the feeling of wear and ensured the absorptivity.

  The absorbent article of the present invention capable of solving the above problems is an absorbent article having a width direction and a front-rear direction, and having a top sheet, a back sheet, and an absorbent core provided therebetween. The absorbent core contains at least pulp fibers, and is formed in a bellows shape having alternating peaks and valleys in the front-rear direction together with the top sheet; on the top sheet, on one side and the other side in the width direction It is characterized in that a central flap is provided that is inclined outward in the width direction and overlaps at least a part of the absorbent core formed in a bellows shape.

  In the absorbent article of the present invention, the absorbent core is formed in a bellows shape having alternating peaks and valleys in the front-rear direction together with the top sheet, so that it is easy to form a curve in the front-rear direction, and the wearer's crotch part In addition to being able to enhance the fit, the presence of the peaks and valleys enhances the cushioning at the crotch and improves the feeling of wear. Moreover, it originates in a bellows-shaped trough part, and it becomes easy to form the clearance gap extended in the width direction between a top sheet and a wearer's skin, and can improve air permeability. Then, on one side and the other side of the top sheet in the width direction, the absorbent article is tilted outward in the width direction and provided with a central flap so as to overlap at least a part of the absorbent core formed in a bellows shape. The diffusibility of urine and the like in the front-rear direction is ensured on the skin surface side of the skin, and the absorbent core can exhibit absorptivity in a wide range in the front-rear direction.

  The absorbent core preferably has a length L1 in the front-rear direction in a state of being formed in a bellows shape that is 0.5 to 0.9 times the length L2 in the front-rear direction in a state in which the bellows is spread. If the absorbent core is formed in an accordion shape so that the ratio of L1 / L2 is in such a range, the absorbent core is formed with an appropriate thickness in an accordion state, and adequately secures cushioning and breathability. At the same time, the absorbent core becomes too bulky.

  The central flap is preferably provided such that the distance between the upright base of the central flap on one side and the upright base of the central flap on the other side is 60 mm or less. By providing the central flap in this manner, the absorbent core having the central flap formed in a bellows shape can be easily covered over a wide range.

  The central flap is preferably provided with an elastic member extending in the front-rear direction. By providing an elastic member in the central flap, the central flap rises toward the wearer's skin due to the contraction force of the elastic member, and a space is easily formed between the wearer's skin and the top sheet, ensuring air permeability. It becomes easy. In addition, a diffusion path for urine and the like to diffuse in the front-rear direction is easily formed by the central flap.

  The central flap is preferably provided with a plurality of elastic members extending in the front-rear direction and arranged in the width direction. By providing the elastic member on the central flap in this way, the rigidity of the central flap can be increased as a whole, and a space is easily formed between the wearer's skin and the top sheet, and the bellows is formed. The unevenness of the absorbent core is less likely to be transmitted to the wearer's skin.

  The central flap is preferably composed of a liquid-permeable nonwoven fabric. By configuring the central flap in this manner, urine or the like can pass through the central flap and be suitably absorbed by the absorbent core. Moreover, a feeling of wear can be improved by making the touch of the center flap soft.

  The absorbent core preferably has an opening or a recess extending in the front-rear direction between the central flap on one side and the central flap on the other side. Thus, by forming an opening or a recessed part in an absorptive core, the air permeability in an opening or a recessed part is improved. In addition, the opening or recess functions as a diffusion path in the front-rear direction of urine and the like, and the absorbent core easily contributes to absorption of urine and the like over a wide range.

  It is preferable that a leak-proof flap inclined inward in the width direction is provided on the outer side in the width direction of the central flap. Side leakage such as urine is prevented by the leak-proof flap. At this time, the center flap and the leakproof flap have a distance between the raised base of the central flap and the raised base of the leakproof flap between the raised base of the central flap on one side and the raised base of the central flap on the other side. It is preferable that it is provided so that it may become longer than this distance, and, thereby, the absorbent core formed in the bellows shape by the center flap can be covered over a wider range. Moreover, since the leak-proof flap is provided on the outer side in the width direction of the absorbent article, a wider range in the width direction of the absorbent core can contribute to absorption of urine and the like.

  In the absorbent article of the present invention, the absorbent core is formed in a bellows shape having alternating peaks and valleys in the front-rear direction together with the top sheet, so that it is easy to form a curve in the front-rear direction, and the wearer's crotch part In addition to being able to enhance the fit, the presence of the peaks and valleys enhances the cushioning at the crotch and improves the feeling of wear. Moreover, it originates in a bellows-shaped trough part, and it becomes easy to form the clearance gap extended in the width direction between a top sheet and a wearer's skin, and can improve air permeability. Then, on one side and the other side of the top sheet in the width direction, the absorbent article is tilted outward in the width direction and provided with a central flap so as to overlap at least a part of the absorbent core formed in a bellows shape. The diffusibility of urine and the like on the skin surface side in the front-rear direction is ensured, and the absorbent core can exhibit absorptivity in a wide range in the front-rear direction.

An example of the absorbent article of this invention is represented, and the top view which looked at the absorbent article from the skin surface side is represented. II-II sectional drawing of the absorbent article shown in FIG. 1 is represented. The III-III sectional view of the absorptive article shown in Drawing 1 is expressed. The other example of the absorbent article of this invention is represented, and the top view which looked at the absorbent article from the skin surface side is represented. The VV sectional view of the absorptive article shown in Drawing 4 is expressed.

  The absorbent article of the present invention has a top sheet, a back sheet, and an absorbent core provided therebetween, and has a width direction and a front-rear direction. Examples of the absorbent article of the present invention include disposable diapers, urine pads (including incontinence pads), sanitary products, and the like.

  In this invention, the front-back direction of an absorbent article means the direction extended in the front-back direction of a wearer's crotch when a wearer wears an absorbent article. The width direction of the absorbent article means a direction that is on the same plane as the absorbent article and is orthogonal to the front-rear direction. The skin side of the absorbent article means the side facing the wearer's skin when the absorbent article is worn, and the outer surface side of the absorbent article is the wearer when wearing the absorbent article. Means the opposite side.

  The shape of the absorbent article is not particularly limited. When the absorbent article is a urine pad, the shape of the absorbent article includes a substantially rectangular shape, an hourglass shape, a gourd shape, and the like.

  When the absorbent article is a disposable diaper, the absorbent article includes, for example, a front side portion, a rear side portion, and a crotch portion that is located between them and includes an absorbent core. As a disposable diaper, for example, an absorbent main body in which an absorbent core is arranged between a top sheet and a back sheet on the skin side surface of an exterior member composed of a front side part, a rear side part, and a crotch part positioned therebetween May be provided. At this time, a substantially rectangular shape or the like is shown as the shape of the absorbent main body. Moreover, as a disposable diaper, the laminated body by which the absorptive core was distribute | arranged between the top sheet | seat and the back sheet | seat may form a front side part, a rear side part, and the crotch part located among these. In addition, a front side part is corresponded to the part which hits a wearer's belly side when wearing a disposable diaper, and a back side part is equivalent to the part which hits a wearer's back side when wearing a disposable diaper. A crotch part is located between a front side part and a rear side part, and is equivalent to the part applied to a wearer's crotch.

  When the absorbent article is a disposable diaper, the disposable diaper is an open-type (tape-type) disposable diaper in which fastening members are provided on the left and right ends of the rear side portion and formed into a pants shape when worn by the fastening member. It may be a pants-type disposable diaper in which a waist opening and a pair of leg openings are formed.

  A top sheet is a sheet | seat provided in the skin surface side rather than an absorptive core, and it is preferable that it is liquid-permeable. As the top sheet, for example, a nonwoven fabric formed from hydrophilic fibers such as cellulose, rayon, and cotton, and a hydrophobic property such as polyolefin (eg, polypropylene, polyethylene), polyester (eg, PET), polyamide (eg, nylon), etc. A non-woven fabric formed from fibers, in which the surface of hydrophobic fibers is hydrophilized with a surfactant, can be used. As the top sheet, a woven fabric, a knitted fabric, a perforated plastic film, or the like may be used.

  The back sheet is a sheet provided on the outer surface side of the absorbent core, and is preferably liquid-impermeable. As the back sheet, a non-woven fabric formed from hydrophobic fibers such as polyolefin (for example, polypropylene, polyethylene), polyester (for example, PET), polyamide (for example, nylon), a plastic film, or the like can be used. Moreover, you may use the laminated body of a nonwoven fabric and a plastic film. In the present invention, the liquid impermeability includes the meaning of water repellency.

  The exterior member may be liquid permeable or liquid impermeable, and a sheet material that can be used for a top sheet or a back sheet can be used. The exterior member is preferably formed by laminating an outer sheet on an inner sheet, and more preferably formed by laminating a liquid-impermeable outer sheet on a hydrophilic inner sheet.

  When using a nonwoven fabric as each sheet material demonstrated above, it is preferable to use a spunbond nonwoven fabric, an air through nonwoven fabric, a point bond nonwoven fabric, a melt blown nonwoven fabric, an airlaid nonwoven fabric, an SMS nonwoven fabric, etc. as a nonwoven fabric.

  The absorbent core is not particularly limited as long as it includes an absorbent material that can absorb excrement such as urine. As an absorptive core, the molded object which shape | molded the absorptive material in the predetermined shape can be used, for example. The absorbent core may be covered with a sheet member such as a paper sheet (for example, tissue paper or thin paper) or a liquid-permeable nonwoven fabric. Examples of the absorbent material contained in the absorbent core include hydrophilic fibers such as pulp fibers, and water-absorbing resins such as polyacrylic acid, polyaspartic acid, cellulose, and starch / acrylonitrile. The absorbent material includes heat-fusible fibers such as polyolefin fibers (eg, polyethylene fibers, polypropylene fibers), polyester fibers (eg, PET fibers), and polyamide fibers (eg, nylon fibers). Also good. These heat-fusible fibers may be hydrophilized with a surfactant or the like in order to increase the affinity with urine or the like.

  In the absorbent article of the present invention, the absorbent core contains at least pulp fibers as the absorbent material. The pulp fibers are preferably contained in the absorbent core as an aggregate of the opened pulp fibers. If the absorbent core contains pulp fibers, the shape retention of the absorbent core is enhanced, and as will be described later, the absorbent core can be easily formed into a bellows shape, and the absorbent core formed into a bellows shape can be easily formed. Cushioning can be improved. Moreover, it becomes easy to absorb the urine etc. excreted from the wearer promptly. The absorbent core preferably further contains a water-absorbing resin from the viewpoint of increasing the absorption capacity. In this case, for example, a pulp fiber aggregate in which a water absorbent resin is mixed or dispersed can be used. The absorbent core preferably contains, for example, 50% by mass or more of pulp fiber, more preferably contains 60% by mass or more, and further preferably contains 70% by mass or more. The said ratio represents the content rate of the pulp fiber in 100 mass% of absorbent cores.

Basis weight of the absorbent core, for example, 100 g / m ² or more preferably, 120 g / m ² or more, and more preferably 135 g / m ² or more, preferably 400 g / m ² or less, 350 g / m ² or less More preferably, 300 g / m ² or less is further preferable, and 250 g / m ² or less is particularly preferable. The absorbent article of the present invention has an absorbent core formed in a bellows shape, as will be described later, but the weight of the absorbent core described here is the weight of the absorbent core in a state in which the bellows is unfolded. means.

  The shape (planar shape) of the absorbent core is not particularly limited. The shape of the absorbent core may be appropriately determined according to the application, and examples thereof include a substantially rectangular shape, an hourglass shape, a gourd shape, and a battledore shape.

  The absorbent core may be formed by laminating a plurality of layers. For example, the absorbent core may have an upper absorbent layer provided on the top sheet side and a lower absorbent layer provided on the back sheet side. The upper absorbent layer and the lower absorbent layer are not particularly limited as long as they contain an absorbent material, and the shape (planar shape) thereof is not particularly limited as well, as described above for the absorbent core.

  In the absorbent article of this invention, the absorptive core is formed in the bellows shape which has a peak part and a trough part by turns in the front-back direction with a top sheet. The absorbent article of the present invention is configured in this way, so that it is easy to bend in the front-rear direction, and the fit of the wearer at the crotch portion can be improved, and the presence of the crest and trough portions increases the crotch. The cushioning property at the portion is increased, and the wearing feeling when the absorbent article is mounted can be improved. In addition, even when the absorbent article is mounted so as to be in close contact with the wearer's skin, a gap extending in the width direction is easily formed between the top sheet and the wearer's skin due to the bellows-shaped valley. Easy to ensure air permeability. Therefore, the stuffiness at the time of wearing an absorptive article can be reduced.

  The bellows-like absorbent core and the top sheet described above can be formed by folding the absorbent core in a front-back direction of the absorbent article in a state where the absorbent core is overlapped with the top sheet. Therefore, an absorptive core will overlap with a top sheet in both the peak part and valley part of a bellows. The peaks and valleys formed by folding the absorbent core together with the top sheet in a bellows shape correspond to the valleys viewed from the back sheet side of the absorbent core. The valley part seen from the sheet | seat side respond | corresponds to the peak part seen from the back seat | sheet side of the absorptive core. In addition, in this invention, unless otherwise indicated, the peak part and trough part of a bellows shall be prescribed | regulated seeing from the skin surface side (top sheet side) of an absorbent article.

  The ridges and valleys of the bellows may be formed so that the ridges and valleys are alternately present in the front-rear direction in the cross-section in the front-rear direction of the absorbent article (that is, the cross section taken along the cutting line extending in the front-rear direction). Each of the bellows and valleys of the bellows is formed so as to extend substantially in the width direction of the absorbent article, but does not need to extend completely in the width direction and extends obliquely with respect to the width direction. Or may extend in a curved shape. Further, two (or more) peak portions may join together in the middle of extending in the width direction, and may become one peak portion, and two (or more) valley portions extend in the width direction. You may join on the way and become one trough. The length of the front-rear method of each peak (or the length of each trough in the front-rear direction) may be the same or different. The absorptive core and the top sheet may be bent in a bellows shape in the front-rear direction as a whole.

  The absorbent core is preferably formed in a bellows shape at least when the absorbent core is divided into three equal parts in the front-rear direction to form a front part, a rear part, and an intermediate part therebetween. More preferably, the intermediate portion is formed in a bellows shape over the entire front-rear direction. As for an absorptive core, a front part and a back part may be formed in the shape of a bellows. The intermediate portion of the absorbent core is defined by being equally divided into three in the front-rear direction in a state where the absorbent core is formed in a bellows shape, for example, in an unloaded state such as being placed on a horizontal base.

  It is preferable that a plurality of peaks and valleys of the absorbent core formed in a bellows shape are provided. The number of peaks and valleys formed in the absorbent core is preferably 5 or more, preferably 8 or more, and more preferably 10 or more. The upper limit of the number of peaks and valleys formed in the absorbent core is not particularly limited, but may be, for example, 50 or less, 40 or less, or 30 or less. . The number of ridges and valleys formed in the absorbent core is counted in the cross section in the front-rear direction of the absorbent core. Further, the number of peaks and valleys formed in the intermediate part of the absorbent core is preferably 3 or more, preferably 5 or more, and more preferably 7 or more. About the upper limit of the number of the peak part and trough part formed in the intermediate part of an absorptive core, for example, 30 or less may be sufficient and 25 or less may be sufficient.

  The absorbent core preferably has a length L1 in the front-rear direction in a state of being formed in a bellows shape that is 0.5 to 0.9 times the length L2 in the front-rear direction in a state in which the bellows is spread. If the absorbent core is formed in an accordion shape so that the ratio of L1 / L2 is in such a range, the absorbent core is formed with an appropriate thickness in an accordion state, and adequately secures cushioning and breathability. At the same time, the absorbent core becomes too bulky. The ratio of L1 / L2 is more preferably 0.6 times or more, and more preferably 0.8 times or less.

  The absorbent core is preferably bonded directly or indirectly to the top sheet over at least the entire middle portion in the front-rear direction, and is directly or indirectly bonded to the top sheet over the entire absorbent core. It is more preferable. For example, when the absorbent core is divided into a 1 cm mesh in the front-rear direction and the width direction in a state in which the absorbent core is expanded (a state in which the bellows is unfolded), it is classified in the middle part of the absorbent core or the entire absorbent core. In any region, the absorbent core is preferably bonded directly or indirectly to the top sheet. Thus, by adhering an absorptive core and a top sheet, an absorptive core becomes easy to be formed in a bellows shape with a top sheet.

  It is preferable that the absorptive core and the top sheet are bonded by an adhesive applied in a predetermined pattern such as a net shape, a linear shape, or a dotted shape. In addition, it is preferable that the absorptive core and the top sheet are adhere | attached by the linear adhesive pattern, and it becomes easy to improve the liquid permeability of a top sheet by this. The linear adhesive pattern may be linear, curved, or a combination thereof. Examples of the curved adhesive pattern include a pattern in which an adhesive is applied in a meandering shape or a spiral shape (spiral shape). The meandering shape includes, for example, a sinusoidal or Ω-like repeating pattern. A linear adhesive pattern can be formed by applying an adhesive by a coater method, a bead method, an omega coating method, a spiral coating method, a pattern coating, or the like.

  As the adhesive, it is convenient in production to use a hot melt adhesive, and among them, a rubber hot melt adhesive is preferably used. The rubber-based hot melt adhesive preferably includes a styrene-based elastomer. Examples of the styrene-based elastomer include a styrene-isoprene-styrene block copolymer (SIS) and a styrene-butadiene-styrene block copolymer (SBS). Styrene-ethylene-butadiene-styrene block copolymer (SEBS), styrene-ethylene-propylene-styrene block copolymer (SEPS), and the like. The styrene elastomer illustrated above may use only 1 type, and may use 2 or more types together.

  In addition to the top sheet, the absorbent core may be formed in a bellows shape together with the back sheet. In this case, the absorbent core is preferably bonded directly or indirectly to the backsheet. Adhesion between the absorbent core and the back sheet may be performed in accordance with the adhesion between the absorbent core and the top sheet described above.

  The bellows of the absorbent core may be formed by adhering adjacent peaks or valleys, and may be formed to be deployable in the front-rear direction. In the latter case, an elastic member extending in the front-rear direction may be provided on the absorbent core, the top sheet, or the back sheet.

  The absorbent core is preferably bent in a bellows shape in the entire thickness direction, and the absorbent core is made of an absorbent material because it is easy to form the absorbent core in this way. It is preferable not to have a plurality of layers but to have only one absorbent layer made of an absorbent material. Specifically, the absorbent core preferably has only one absorbent layer containing at least pulp fibers.

  By the way, when the absorptive core is formed in a bellows shape having alternating peaks and valleys in the front-rear direction together with the top sheet as described above, the diffusibility of urine and the like in the front-rear direction is reduced on the top sheet. In addition, there is a possibility that the absorptivity at the front part and the rear part of the absorbent core is not sufficiently utilized. Therefore, in the absorbent article of the present invention, the central flap is formed on one side and the other side in the width direction of the top sheet so as to tilt outward in the width direction and overlap with at least a part of the absorbent core formed in a bellows shape. Is provided. The central flap is provided on the skin surface side of the top sheet. By providing the central flap in this way, diffusibility in the front-rear direction of urine and the like is ensured on the skin surface side of the absorbent article, and the absorbent core can exhibit absorptivity in a wide range in the front-rear direction. Become.

  The central flap may be provided so as to overlap at least part of the bellows-shaped portion of the absorbent core. The overlap between the center flap and the absorbent core is defined with the center flap lying down outward in the width direction. The central flap is preferably provided so as to overlap at least the middle part in the front-rear direction of the absorbent core, and may be provided so as to overlap the front part and the rear part of the absorbent core. A center flap may be provided over the whole front-back direction of an absorptive core. In addition, it is preferable that a center flap is not provided so that it may overlap over the whole width direction of an absorptive core. Specifically, the absorbent core preferably extends outward from the outer edge of the central flap in the width direction with the central flap lying down outward in the width direction. It becomes easy to ensure breathability when wearing. More preferably, the absorptive core extends outward from the outer edge in the width direction of the central flap in any of the front portion, the intermediate portion, and the rear portion.

  The central flaps are provided on one side and the other side in the width direction of the top sheet, respectively, but the central flap on one side and the central flap on the other side are preferably provided close to each other. Specifically, the distance between the upright base of the central flap on one side and the upright base of the central flap on the other side (that is, the distance between the upright bases of the central flap) is preferably 60 mm or less, and is 50 mm or less. More preferably, it is more preferably 40 mm or less. By providing the central flap in this way, the central flap can easily cover a wide range of the portion of the absorbent core formed in the bellows shape (particularly including the central portion in the width direction of the absorbent core). The starting point where the central flap rises is called the standing base, and the leading end where the central flap rises is called the free end.

  The distance between the standing bases of the central flap is preferably 1.8 times or less, more preferably 1.6 times or less of the length from the standing base of the central flap to the free end. By forming the central flap in this way, the central flap is unlikely to fall inward in the width direction. That is, even if the central flap on one side is about to fall inward in the width direction, it is easy to prevent the central flap on the other side from getting in the way and preventing the central flap from falling completely inward in the width direction. Become.

  The central flap is preferably provided with an elastic member extending in the front-rear direction. By providing an elastic member in the central flap, the central flap rises toward the wearer's skin due to the contraction force of the elastic member, and a space is easily formed between the wearer's skin and the top sheet, ensuring air permeability. It becomes easy. In addition, a diffusion path for urine and the like to diffuse in the front-rear direction is easily formed by the central flap.

  The central flap is preferably provided with an elastic member at least near the free end. Specifically, when the region from the standing base of the central flap to the free end is divided into three equal parts to form a base side region, a free end side region, and an intermediate region therebetween, an elastic member is provided at least in the free end side region. It is preferred that The free end of the central flap can be raised high by the elastic member provided in the free end side region, and a wider space is easily formed between the wearer's skin and the top sheet.

  The central flap is preferably provided with a plurality of elastic members extending in the front-rear direction and arranged in the width direction. By providing the elastic member on the central flap in this way, the rigidity of the central flap can be increased as a whole, and a space is easily formed between the wearer's skin and the top sheet, and the bellows is formed. The unevenness of the absorbent core can be made difficult to be transmitted to the wearer's skin. More preferably, the central flap is provided with elastic members in the base region and / or the intermediate region in addition to the free end region.

  The elastic member may be fixed to the central flap by a known joining means such as an adhesive. In addition, when a plurality of elastic members are provided in the central flap in the width direction, it is preferable that a region where no adhesive is applied (adhesive non-coating region) is provided between adjacent elastic members. The central flap is hard to be formed by an adhesive, and the touch of the central flap can be improved.

  It is preferable that the front and rear end portions of the outer side surface in the width direction are directly or indirectly joined to the top sheet so that the center flap is inclined to the outside in the width direction and easily rises. The front and rear end portions of the outer side surface in the width direction of the center flap are joined to the top sheet, so that a portion between the front end portion and the rear end portion of the center flap is formed to be able to stand. The outer side surface of the central flap means an outer side surface with respect to the width direction of the central flap in a state where the central flap is raised. The front end and the rear end of the central flap are respectively defined as portions including the front end or the rear end of the central flap. The front end is set to 0% as a relative position with respect to the front and rear direction of the center flap, and the rear end is set to 100%. %, For example, the front end corresponds to a region of 0% to 15%, and the rear end corresponds to a region of 85% to 100%. The relative position is defined in a state in which the absorbent article is completely expanded. When an elastic member is provided on the central flap, the relative position is defined in a state in which the elastic member is finely cut and no contraction force is expressed.

  The center flap can be formed, for example, by arranging a center sheet on the top sheet and joining the center portion in the width direction of the center sheet to the top sheet. Alternatively, it can be formed by arranging the right center sheet and the left center sheet on both sides in the width direction of the top sheet, and joining the inner portions in the width direction of the right center sheet and the left center sheet to the top sheet. When providing an elastic member in the central flap, the elastic member may be attached to these center sheets.

  The central flap may be liquid permeable or liquid impervious, so the center sheet (including the left center sheet and the right center sheet) can be used for top sheets and back sheets. Can be used. In addition, it is preferable that a center flap or a center sheet | seat is liquid-permeability, and, thereby, urine etc. can permeate | transmit a center flap and a center sheet | seat, and can be suitably absorbed by an absorptive core. More preferably, the center flap or the center sheet is made of a liquid-permeable nonwoven fabric, whereby the touch of the center flap can be made soft and the feeling of wear can be improved.

  The absorbent core preferably has an opening or a recess extending in the front-rear direction at the center in the width direction. The opening or the recess may be formed so as to include the center line in the width direction of the absorbent core and extend in the front-rear direction along the center line. The opening or recess extending in the front-rear direction means an opening or recess having a shape longer in the front-rear direction than in the width direction. Thus, by forming an opening or a recessed part in an absorptive core, the air permeability in an opening or a recessed part is improved. In addition, the opening or recess functions as a diffusion path in the front-rear direction of urine and the like, and urine and the like are easily absorbed by the absorbent article, and the absorbent core easily contributes to absorption of urine and the like over a wide range.

  The opening is provided through the absorbent core in the thickness direction. The recess is formed by partially reducing the weight of the absorbent core. The recesses are preferably formed such that the basis weight is 60% by mass or less (more preferably 50% by mass or less, and further preferably 40% by mass or less) as compared with the part other than the recesses.

  When a recessed part is formed in an absorptive core, a recessed part may be formed in the surface by the side of the top sheet of an absorptive core, or may be formed in the surface by the side of a back sheet. When the absorbent core is composed of an upper absorbent layer and a lower absorbent layer, an opening is formed in the upper absorbent layer, and the lower absorbent layer is provided so as to cover the opening, whereby the absorbent core has a recess. Conversely, an opening may be formed in the lower absorbent layer, and the upper absorbent layer may be provided so as to cover the opening, whereby a recess may be formed in the absorbent core. Preferably, the recess is formed on the surface of the absorbent core on the top sheet side.

  The absorbent core may be provided with only one opening or recess, or may be provided with two or more, but preferably, only one opening or recess is provided in the absorbent core. That is, it is preferable that the absorbent core is provided with only one opening or recess, and the opening or recess is provided at the center in the width direction so as to extend in the front-rear direction. Thus, by forming an opening or a recess in the absorbent core, the part on which the wearer's buttock is placed is formed in an accordion shape of the absorbent core so that cushioning is ensured, and between the left and right buttock Can be provided with openings or recesses to improve air permeability.

  The width in the width direction of the opening or the recess is preferably 5% or more, more preferably 8% or more, and further preferably 10% or more of the length in the width direction of the narrowest part of the absorbent core. Moreover, 30% or less is preferable, 25% or less is more preferable, and 20% or less is further more preferable. In addition, the narrowest part of an absorptive core means the part formed narrowest in the width direction in the intermediate part of the front-back direction of an absorptive core. The width of the opening or the recess is preferably 5 mm or more, more preferably 8 mm or more, preferably 35 mm or less, and more preferably 25 mm or less.

  The opening or the recess is preferably provided at least in the middle part in the front-rear direction of the absorbent core, and may extend to the front part and / or the rear part of the absorbent core. In addition, it is preferable that an opening or a recessed part is not provided over the whole front-back direction of an absorptive core, ie, the front side end of an opening or a recessed part is located back rather than the front side end of an absorptive core, and the back side of an opening or a recessed part The end is preferably located in front of the rear end of the absorbent core.

  The absorbent core is particularly preferably provided with an opening among the opening and the recess. If an opening extending in the front-rear direction is provided at the center of the absorbent core in the width direction, the absorbent core bellows can be prevented from being distorted even if a force directed inward in the width direction is applied to the absorbent core. The absorbent core is easily maintained in a bellows shape.

  It is preferable that the absorbent article is provided with a leak-proof flap that is inclined inward in the width direction outside the center flap in the width direction. Side leakage such as urine is prevented by the leak-proof flap.

  The leak-proof flap is preferably provided with an elastic member extending in the front-rear direction. By providing an elastic member on the leak-proof flap, the leak-proof flap is likely to rise toward the wearer's skin by the contraction force of the elastic member. The leak-proof flap is preferably provided with an elastic member at least in the vicinity of the free end when the rising base is the rising base and the rising tip is the free end. Specifically, when the region from the standing base portion of the leak-proof flap to the free end is divided into three equal parts to form the base side region, the free end side region, and the intermediate region therebetween, the elastic member is at least in the free end side region. It is preferable to be provided. The leak-proof flap may be provided with a plurality of elastic members arranged in the width direction.

  The elastic member may be fixed to the leakproof flap by a known joining means such as an adhesive. In addition, when a plurality of elastic members are provided side by side in the width direction on the leak-proof flap, it is preferable that an area where no adhesive is applied (adhesive non-coating area) is provided between adjacent elastic members. This makes it difficult for the leak-proof flap to be strongly formed by the adhesive, thereby improving the touch of the leak-proof flap.

  The leak-proof flap may be provided over the entire length in the front-rear direction of the absorbent article, or may be provided in a part in the front-rear direction of the absorbent article. In addition, from the point which improves the side leakage prevention effect by a leak-proof flap, it is preferable that a leak-proof flap is provided with the length of 70% or more of the front-back direction of an absorbent article, 80% or more is more preferable, 90% or more Is more preferable.

  It is preferable that the front and rear end portions of the inner side surface in the width direction are directly or indirectly joined to the top sheet so that the leak-proof flap is inclined inward in the width direction and easily rises. By connecting the front and rear end portions of the inner side surface in the width direction of the leak-proof flap to the top sheet, a portion between the front end portion and the rear end portion of the leak-proof flap is formed to be able to stand up. The inner side surface of the leak-proof flap means the inner side surface with respect to the width direction of the leak-proof flap when the leak-proof flap is raised. The front end and the rear end of the leak-proof flap are each defined as a part including the front end or the rear end of the leak-proof flap, and the front end is set to 0% relative to the front-rear direction of the leak-proof flap. When the end is defined as 100%, for example, the front end corresponds to a region of 0% to 15%, and the rear end corresponds to a region of 85% to 100%. In addition, the relative position is defined in a state where the absorbent article is completely spread, and when an elastic member is provided on the leak-proof flap, the relative position is defined in a state in which the elastic member is finely cut and no contraction force is expressed. .

  The leak-proof flap is preferably provided so as not to overlap the central flap. Specifically, it is preferable that the center flap and the leak-proof flap are formed so as to be separated from each other in a lying state. If the central flap and the leak-proof flap are formed in this way, when the absorbent article is used, the central flap and the leak-proof flap can easily stand up without being disturbed by each other.

  The center flap and leak-proof flap have a distance between the standing base of the center flap and the stand-up base of the leak-proof flap that is greater than the distance between the standing base of the center flap on one side and the standing base of the center flap on the other side. It is preferable that it is provided so as to be longer. In this case, since the central flaps on one side and the other side in the width direction are provided close to each other, the absorbent core formed in a bellows shape by the central flap can be covered over a wider range. In addition, since the leak-proof flap is provided on the outer side in the width direction of the absorbent article, a wide range of the absorbent core can contribute to absorption of urine and the like, and side leakage of urine and the like is prevented by the leak-proof flap. It will be effectively prevented. In addition, the distance between the standing base part of a center flap and the standing base part of a leak-proof flap means the distance between a center flap and the leak-proof flap located in the width direction of the said center flap.

  The leak-proof flap can be formed, for example, by joining side sheets extending in the front-rear direction on both sides in the width direction of the top sheet, and providing an elastic member on an inner portion in the width direction of the side sheet. By providing the side seat and the elastic member in this manner, the inner portion of the side seat in the width direction rises toward the wearer's skin due to the contraction force of the elastic member, and a leak-proof flap is formed. The leak-proof flap or side sheet is preferably composed of a liquid-impermeable plastic film, a liquid-impermeable nonwoven fabric, or the like.

  In addition to the elastic member described above, another elastic member may be provided in the absorbent article of the present invention. For example, the absorbent article may be provided with elastic members extending in the front-rear direction at both ends in the width direction, or may be provided with elastic members extending in the width direction at both ends in the front-rear direction. By providing elastic members extending in the front-rear direction at both ends in the width direction of the absorbent article, the fit around the wearer's leg is improved, and leakage of urine and the like from the leg is prevented. By providing elastic members extending in the width direction at both ends in the front-rear direction of the absorbent article, the fit around the waist of the wearer is enhanced, and leakage of urine and the like from the abdomen and back is prevented.

  Further, an elastic member extending in the front-rear direction may be provided between the central flap on one side and the central flap on the other side, whereby the standing base of the central flap is lifted toward the wearer's skin, and the absorbent article When the is worn, the central flap is easily positioned so as to overlap the absorbent core formed in a bellows shape.

  As each elastic member demonstrated above, the elastic elastic material used for normal absorbent articles, such as a polyurethane thread | yarn, a polyurethane film, and natural rubber, can be used. The elastic member is preferably fixed in an expanded state with an adhesive such as a hot melt adhesive. For example, polyurethane yarn having a fineness of 40 to 1,240 dtex is stretched and arranged at a magnification of 1.1 to 5.0 times and fixed. As the joining means, a rubber-based hot melt adhesive is preferably used. The magnification is 1.0 in the non-expanded state.

  Next, the structural example of the absorbent article of this invention is demonstrated with reference to drawings. In the drawings, an open type (tape type) disposable diaper is shown as an absorbent article. The present invention is not limited to the embodiments shown in the drawings.

  1 to 3 show an example of the absorbent article of the present invention. 1 represents a plan view of an open type disposable diaper as an absorbent article as seen from the skin side, FIG. 2 represents a II-II cross-sectional view of the absorbent article shown in FIG. 1, and FIG. The III-III partial sectional view of the absorptive article shown in Drawing 1 is expressed. 3 shows a cross-sectional view of a portion where the absorbent core is folded in a bellows shape. In the drawings of the present application, the arrow x represents the width direction, the arrow y represents the front-rear direction, and the direction perpendicular to the surface formed by the arrows x, y represents the thickness direction (vertical direction) z. In FIG. 1, the upper side of the drawing corresponds to the front side of the absorbent article, and the lower side of the drawing corresponds to the rear side of the absorbent article.

  The absorbent article 1 (1A) has an absorbent core 4 disposed between the top sheet 2 and the back sheet 3. The excrement passing through the top sheet 2 is accommodated by the absorbent core 4. The back sheet 3 is provided on the outer surface side of the absorbent core 4 to prevent excrement from leaking to the outside. In the absorbent article 1A, the absorbent core 4 is formed in an hourglass shape.

  A fastening member 15 is attached to the left and right ends of the rear side portion of the absorbent article 1A in the front-rear direction y. The fastening member 15 is configured by providing a fastener 17 on a base sheet 16. The absorbent article 1A can be mounted by placing it on the crotch of the wearer and joining the fastener 17 of the fastening member 15 to the outer side surface of the front side portion of the absorbent article 1A. As the fastener 17, a hook member of a hook, a loop, or a fastener or an adhesive can be employed.

  The absorptive core 4 contains at least pulp fibers, and is formed in a bellows shape having alternating peaks 5A and valleys 5B in the front-rear direction y together with the top sheet 2. By forming the absorbent core 4 in a bellows shape together with the top sheet 2, a bellows portion 5 having a peak portion 5A and a valley portion 5B is formed. By forming the bellows portion 5 in this manner, the absorbent article 1A can be easily bent in the front-rear direction y, and can improve the fit at the wearer's crotch portion, and cushioning properties at the crotch portion. Can be increased. Moreover, it originates in the trough part 5B of the bellows part 5, and it becomes easy to form the clearance gap extended in the width direction x between the top sheet 2 and a wearer's skin, and it becomes easy to ensure air permeability. As shown in FIG. 3, in the absorbent article 1 </ b> A, the absorbent core 4 is bent into a bellows shape together with the top sheet 2 and the backsheet 3 to form a bellows portion 5.

  The top sheet 2 is provided with a central flap 7 on one side and the other side in the width direction x, which is inclined outwardly in the width direction x and overlaps at least a part of the absorbent core 4 formed in a bellows shape. ing. That is, the central flap 7 is provided so as to overlap with at least a part of the bellows portion 5. In the drawing, the center sheet 9 is arranged on the top sheet 2, the center portion of the center sheet 9 in the width direction x is joined to the top sheet 2, and both end portions of the center sheet 9 in the width direction x are formed to rise. Thus, the central flap 7 is formed. The central flap 7 includes a central flap 7A on one side in the width direction x and a central flap 7B on the other side. By providing the central flap 7, the diffusibility of excrement such as urine in the front-rear direction y is secured on the skin surface side of the absorbent article 1A, and the absorbent core 4 easily contributes to the absorption of urine over a wide range. Become. In the drawing, the central flap 7 is provided over the entire front-rear direction y of the absorbent core 4, and inward from the outer edge of the absorbent core 4 in the width direction x over the entire front-rear direction y. Is provided.

  The central flap 7 is provided with an elastic member 8 extending in the front-rear direction y. By providing the elastic member 8 on the central flap 7, the central flap 7 rises toward the wearer's skin, and a space is easily formed between the wearer's skin and the top sheet 2, and air permeability is easily secured. . In addition, a diffusion path for urine and the like to diffuse in the front-rear direction y is easily formed between the central flap 7A on one side and the central flap 7B on the other side.

  In the absorbent article 1A, the central flap 7 is provided with a plurality of elastic members 8 extending in the front-rear direction y (three in each of the central flap 7A on one side and the central flap 7B on the other side) in the width direction x. It has been. By providing a plurality of elastic members 8 on the central flap 7, the rigidity of the central flap 7 can be enhanced as a whole, and a space is easily formed between the wearer's skin and the top sheet 2, and the bellows portion 5. The unevenness can be made difficult to be transmitted to the wearer's skin.

  In the absorbent core 4, an opening 6 extending in the front-rear direction y is formed between the central flap 7A on one side and the central flap 7B on the other side. By providing the opening 6 in the absorbent core 4, the air permeability at the opening 6 can be enhanced. The opening 6 can also function as a diffusion path in the front-rear direction y of urine or the like.

  Leg elastic members 13 are provided on both sides of the absorbent article 1 </ b> A in the width direction x, outside the width direction x of the absorbent core 4. Leg gathers are formed around the legs of the wearer by the leg elastic members 13, and leakage of excrement such as urine from the legs is prevented.

  A waist elastic member 14 is provided at the end in the front-rear direction y of the absorbent article 1A, outside the front-rear direction y of the absorbent core 4. A waist gather is formed along the circumference of the wearer's waist by the waist elastic member 14, and leakage of urine and the like from the back side and the abdomen side is prevented.

  Next, another configuration example of the absorbent article of the present invention will be described. FIG. 4 shows a plan view of an open-type disposable diaper as an absorbent article as seen from the skin surface side, and FIG. 5 shows a VV cross-sectional view of the absorbent article shown in FIG. In the following description, the description of the same part as the above description is omitted.

  In the absorbent article 1 (1B) shown in FIGS. 4 and 5, a leak-proof flap 10 tilted inward in the width direction x is provided outside the central flap 7 in the width direction x. The leak-proof flap 10 can prevent side leakage from the absorbent article 1B.

  The leak-proof flap 10 is provided with an elastic member 11 extending in the front-rear direction y. By providing the elastic member 11 on the leak-proof flap 10, the leak-proof flap 10 can easily rise toward the wearer's skin, and side leakage from the absorbent article 1B can be prevented.

  In the drawing, the side sheet 12 is arranged on the top sheet 2, the outer part in the width direction x of the side sheet 12 is joined to the top sheet 2 or the back sheet 3, and the inner part in the width direction x of the side sheet 12. By providing the elastic member 11, the leak-proof flap 10 is formed. The leak-proof flap 10 includes a leak-proof flap 10A on one side in the width direction x and a leak-proof flap 10B on the other side.

  The central flap 7 and the leak-proof flap 10 have the same distance between the standing base of the central flap 7A (or 7B) and the standing base of the leak-proof flap 10A (or 10B). It is provided so as to be longer than the distance from the upright base portion of the central flap 7B on the side. By providing the central flap 7 and the leak-proof flap 10 in this way, a wider range of the bellows portion 5 can be covered by the central flap 7. Moreover, since the leak-proof flap 10 is provided on the outer side in the width direction x of the absorbent article 1B, the absorbent core 4 can contribute to absorption of urine and the like in a wide range in the width direction x. Side flaps such as urine are effectively prevented by the flap 10.

  As mentioned above, although the structural example of the absorbent article of this invention was demonstrated, the deformation | transformation of the absorbent article of this invention can add various deformation | transformation to said structural example. For example, a recess may be formed in the absorbent core 4 instead of the opening 6. 2 and 5, the elastic member 8 is attached to one surface (lower surface in the drawing) of the center sheet 9, and the elastic member 11 is attached to one surface (lower surface in the drawing) of the side seat 12. Although attached, the center sheet 9 and the side sheet 12 may have a multilayer structure, and the elastic member 8 and the elastic member 11 may be provided between the layers. Other elastic members can be arbitrarily disposed or removed.

1, 1A, 1B: Absorbent article 2: Top sheet 3: Back sheet 4: Absorbent core 5: Bellows part, 5A: Mountain part, 5B: Valley part 6: Opening 7: Central flap 8, 11, 13, 14 : Elastic member 10: Leak-proof flap

Claims (9)

An absorbent article having a width direction and a front-rear direction, having a top sheet, a back sheet, and an absorbent core provided therebetween,
The absorbent core contains at least pulp fibers, and is formed in a bellows shape having alternating peaks and valleys in the front-rear direction together with the top sheet,
The top sheet is provided with a central flap on one side and the other side in the width direction so as to incline outward in the width direction and overlap with at least a part of the absorbent core formed in the bellows shape. Absorbent article characterized by.   The length L1 in the front-rear direction of the absorbent core formed in a bellows shape is 0.5 to 0.9 times the length L2 in the front-rear direction of the bellows expanded state. Absorbent article as described in 1.   The absorbent article according to claim 1 or 2, wherein a distance between the standing base portion of the central flap on the one side and the standing base portion of the central flap on the other side is 60 mm or less.   The absorbent article as described in any one of Claims 1-3 in which the elastic member extended in the front-back direction is provided in the said center flap.   The absorbent article according to any one of claims 1 to 4, wherein the central flap is provided with a plurality of elastic members extending in the front-rear direction and arranged in the width direction.   The absorbent article according to any one of claims 1 to 5, wherein the central flap is made of a liquid-permeable nonwoven fabric.   The said absorptive core has the opening or recessed part extended in the front-back direction between the center flap of the said one side, and the center flap of the said other side, The absorptivity as described in any one of Claims 1-6. Goods.   The absorbent article as described in any one of Claims 1-7 in which the leak-proof flap inclined to the inward of the width direction is provided in the outward of the width direction of the said center flap.   The center flap and the leakproof flap have a distance between the standing base of the central flap and the standing base of the leakproof flap so that the standing base of the central flap on the one side and the standing base of the central flap on the other side. The absorbent article of Claim 8 provided so that it may become longer than the distance between.

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