JP2016112029A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article which prevents breakage of an absorbent core and falling of an absorbent material from the absorbent core without a reduction in absorption performance and can exhibit the excellent absorption performance for a long period of time during the wearing.SOLUTION: A non-fiber-stacked part 5 comprising a hole penetrating an absorbent core in a thickness direction is formed on the absorbent core 40 in a manner to extend in a longitudinal direction X in a crotch part 1M. In the non-fiber-stacked part 5, a skin-side core wrap sheet 41 and a non-skin-side core wrap sheet 42 are joined. While the absorbent core 40 does not absorb a liquid, a tucked part 6 where a part of the non-skin-side core wrap sheet 42 is folded in a lateral direction Y is formed between the absorbent core 40 and a rear surface sheet 3, and at least a part of the tucked part 6 is overlapped with a part (a part where an absorbent material exists) excluding the non-fiber-stacked part 5 in the absorbent core 40 in the thickness direction of the absorbent core 40.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an absorbent article such as a disposable diaper.

  A typical form of the absorbent article includes a liquid-permeable top sheet, a liquid-impermeable back sheet, and a vertically long absorbent body disposed between both sheets. Further, the absorbent body includes a liquid-retaining absorbent core containing cellulosic fibers such as wood pulp and a water-absorbing polymer, and a water-permeable core wrap sheet that covers the absorbent core. Things are known. The core wrap sheet serves as a sheet for receiving an absorbent core-forming material such as a water-absorbing polymer at the time of manufacturing the absorbent body, and plays a role of wrapping and shaping the absorbent core after the manufacture.

  Conventionally, for the purpose of improving the diffusibility of excretory fluids such as urine in the absorbent article in the longitudinal direction, a non-fibrous portion comprising a hole penetrating the absorbent core in the thickness direction has been longitudinally formed in the absorbent article. It is performed to extend in the direction. For example, in Patent Document 1, a non-stacking portion extending in the vertical direction in a plan view is formed in the center portion and both side portions of the crotch portion in the absorbent core, and the non-stacking portions on both side portions in the lateral direction are formed. Describes joining two core wrap sheets positioned above and below the absorbent core, but not joining the core wrap sheets in the non-stacked portion at the center in the lateral direction. According to Patent Document 1, it is said that the shape retention of the absorbent core is excellent, the swelling inhibition of the water-absorbing polymer is less likely to occur, and the absorption performance of the water-absorbing polymer can be sufficiently expressed.

  Patent Document 2 describes an absorbent article in which pleats composed of folded portions are formed in side regions along the longitudinal direction of each of the back sheet and the absorbent body. This pleat is formed by folding a Z-shaped folded portion formed along the side region of the absorbent body and a Z-shaped folded portion formed along the side region of the back sheet. It is said that the liquid spreads as it absorbs the liquid, and is spread so as to surround the user's body.

JP 2012-34715 A Japanese translation of PCT publication No. 2004-525732

  Absorbent cores composed of absorbent materials such as water-absorbing polymers can be used to remove the water-absorbing polymer, to cause partial breakage of the absorbent core due to the water-absorbing polymer absorbing liquid and swelling. There are problems such as the subsequent greater breakdown, that is, the collapse of the absorbent core. For the absorbent core having such a problem, as described in Patent Document 1, a non-stacked fiber portion where no absorbent material exists is provided, and the non-stacked fiber portion is arranged above and below the absorbent core. Joining the core wrap sheets that are present is effective in solving the above problems. Further, as described in Patent Document 1, when the non-stacked portion of the absorbent core is formed so as to extend in the longitudinal direction of the absorbent article, the non-stacked portion of the absorbent core guides excretory fluid such as urine. Since it functions as a passage, it can be expected that liquid diffusibility is improved and absorption performance is improved. However, in order to prevent the falling off of the water-absorbing polymer and the destruction of the absorbent core, the bonding force between the core wrap sheets in the non-stacked portion of the absorbent core is changed to the force to swell the absorbent core. Where it is necessary to make it strong enough not to lose, if the core wrap sheets are joined so strongly in the non-stacked part, the absorbent core and the water-absorbing polymer constituting the core will swell. There is a possibility that the absorption performance is deteriorated.

  Thus, the effect of preventing the destruction of the absorbent core by suppressing the swelling of the absorbent core by the core wrap sheet and the absorption performance of the absorbent core are in a trade-off relationship, and both are compatible at a high level. The technology to obtain has not yet been provided. As described in Patent Document 2, there is a possibility that the technology for forming the pleats by folding the constituent members of the absorbent article can achieve both the prevention of the destruction of the absorbent core and the prevention of the decrease in the absorption performance, In the invention described in Patent Document 2, since the pleat is formed in the side region of the absorber, it absorbs the liquid and spreads outward in the lateral direction and protrudes from the region where the absorber is disposed. Cannot be prevented.

  Accordingly, the present invention can prevent the breakage of the absorbent core and the removal of the absorbent material from the absorbent core without causing a decrease in the absorbent performance, and exhibits excellent absorbent performance for a long time during wearing. The present invention relates to a possible absorbent article.

  The present invention comprises a liquid-retaining absorbent body and a back sheet disposed on the non-skin facing surface side of the absorbent body, and has a longitudinal direction corresponding to the wearer's front-rear direction and a lateral direction perpendicular thereto. An absorbent article having a crotch portion disposed in a crotch portion of the wearer, wherein the absorbent includes an absorbent core containing a water-absorbing polymer and hydrophilic fibers, and a skin facing surface of the absorbent core A non-skin-side core wrap sheet covering the non-skin-facing surface of the absorbent core, and at least the non-skin-side core wrap sheet is made of a nonwoven fabric, The absorbent core is formed with a non-stacked portion comprising holes penetrating the absorbent core in the thickness direction so as to extend in the longitudinal direction at the crotch portion, and the skin-side core wrap sheet and the Non-skin side core wrap sheet is joined In the state where the absorbent core is not absorbing liquid, a tack portion in which a part of the non-skin side core wrap sheet is folded in the lateral direction is formed between the absorbent core and the back sheet. In addition, the present invention provides an absorbent article in which at least a part of the tack part overlaps with a part other than the non-stacked fiber part in the absorbent core in the thickness direction of the absorbent core.

  According to the present invention, it is possible to prevent the absorbent core from being broken and the absorbent material from falling off the absorbent core without causing a decrease in the absorption performance, and to have an excellent absorption performance for a long time during wearing. An absorbent article that can be exerted is provided.

FIG. 1 is a partially broken plan view of a surface sheet side, that is, a skin facing surface side, showing a developed state in which a disposable diaper as an embodiment of the absorbent article of the present invention is expanded in a flat shape by extending elastic members of each part. It is. FIG. 2 is a schematic cross-sectional view taken along the line II of FIG. FIG. 3 is a view corresponding to FIG. 2 and showing the absorber and the back sheet shown in FIG. 2 in more detail by separating them. FIG. 4 is a view corresponding to FIG. 3 schematically showing a state in which the absorbent shown in FIG. FIG. 5: is a top view which shows typically the skin opposing surface of other embodiment of the absorber which concerns on this invention. 6 is a schematic cross-sectional view taken along the line II-II in FIG.

  Hereinafter, the absorbent article of the present invention will be described based on a disposable diaper which is a preferred embodiment thereof with reference to the drawings. The disposable diaper 1 of this embodiment is shown by FIG.1 and FIG.2. The diaper 1 includes a liquid-retaining absorbent body 4 and a back sheet 3 disposed on the non-skin facing surface side of the absorbent body 4, and is orthogonal to the longitudinal direction X corresponding to the wearer's front-rear direction. And a crotch portion 1M disposed in the crotch portion of the wearer. The wearer's front-rear direction is a direction extending from the wearer's ventral side to the dorsal side through the crotch part having the excretory part.

  The diaper 1 is a so-called unfolded disposable diaper. As shown in FIGS. 1 and 2, the diaper 1 is disposed on the liquid-retaining absorbent body 4 and the skin-facing surface side of the absorbent body 4. A liquid-permeable top sheet 2 that can come into contact with the skin and a liquid-impermeable or water-repellent back sheet 3 disposed on the non-skin facing surface side of the absorber 4 are provided. The absorber 4 is disposed between the sheets 2 and 3 and has a shape that is long in the vertical direction X in a plan view as shown in FIG. The diaper 1 has an abdominal side portion 1F disposed on the abdomen side of the wearer when worn, a back side portion 1R disposed on the back side, and a crotch portion 1M positioned therebetween, and a ventral side portion. It has a vertical direction X extending from 1F to the back side 1R via the crotch 1M and a horizontal direction Y orthogonal thereto.

  In this specification, the “skin facing surface” refers to a surface of the absorbent article or a component thereof (for example, the absorbent body 4) that is directed toward the wearer's skin when the absorbent article is worn, that is, the wearer's skin. The “non-skin facing surface” is a surface that is directed to the side opposite to the skin side when the absorbent article is worn, that is, the side that is relatively far from the wearer's skin. It is. In addition, "at the time of wearing" here means the state in which the normal proper wearing position is maintained, and does not include the case where the absorbent article is in a state shifted from the wearing position.

  Each of the top sheet 2 and the back sheet 3 has a size larger than that of the absorber 4, and extends outward from the peripheral edge of the absorber 4. The back sheet 3 forms the outer shape of the diaper 1 in the unfolded and stretched state as shown in FIG. As the top sheet 2 and the back sheet 3, various types conventionally used for this type of absorbent article can be used without particular limitation. For example, various nonwoven fabrics or apertured films can be used as the top sheet 2, and a resin film, a laminate of a resin film and a nonwoven fabric, or the like can be used as the back sheet 3. The back sheet 3 includes, for example, a liquid-impermeable film sheet alone and a non-skin facing surface side of the film sheet, for example, a non-woven fabric laminated and disposed.

  The diaper 1 has both side edges along the vertical direction X curved in an inward arc shape in the central portion of the vertical direction X including the crotch portion 1M, and in the plan view as shown in FIG. The section is in the shape of an hourglass with an inner part. The crotch part 1M is a region located in the central part in the vertical direction when the absorbent body 4 is divided into three equal parts in the vertical direction, and includes a non-illustrated excretory part facing part that is disposed to face the excretion part of the wearer when worn. Yes. The excretory part facing part is usually located at a position slightly deviated from the center of the diaper 1 in the longitudinal direction X, that is, slightly closer to the back side part 1R than the virtual center line that bisects the diaper 1 in the longitudinal direction X.

  Between the top sheet 2 and the back sheet 3 at the waist, which is the longitudinal end of each of the ventral side 1F and the back side 1R, a thread-like elastic member 31 is stretched along the lateral direction Y. The waist gathers are formed by the contraction of the elastic member 31 at the waist when the diaper 1 is worn. Moreover, the side seat | sheet 34 is distribute | arranged to the left-right both sides along the vertical direction X in the surface sheet 2 side of the diaper 1, respectively. The side seat 34 has an inner edge along the vertical direction X, and an outer edge along the vertical direction X that is located outside the inner edge in the lateral direction Y, as shown in FIG. In view, the inner edge overlaps the absorbent body 4, and the outer edge extends from the side edge along the longitudinal direction X of the absorbent body 4 outward in the lateral direction Y and is joined to the back sheet 3. Between the side sheet 34 and the back sheet 3 in the left and right leg portions arranged around the legs of the wearer, a thread-like elastic member 32 is fixed in an extended state along the vertical direction X. A pair of leg gathers is formed in the leg portion when the diaper 1 is worn by contraction of the elastic member 32. Further, a thread-like elastic member 33 is fixed to the inner edge portion of the side seat 34 in an elongated state along the longitudinal direction X. Accordingly, when the diaper 1 is worn, at least the crotch portion 1M is contracted by the contraction of the elastic member 33. A three-dimensional gather is formed. The top sheet 2, the back sheet 3, the absorber 4, the elastic members 31, 32, 33 and the side sheet 34 are joined to each other by a known joining means such as a hot-melt adhesive.

  As shown in FIG. 1, a pair of fastening tapes 35, 35 are provided on both side edges along the longitudinal direction X of the back side 1 </ b> R of the diaper 1. A fastening portion (not shown) made of a male member of a mechanical surface fastener is attached to the fastening tape 35. Moreover, the to-be-attached area | region 36 which consists of the female member of a mechanical hook-and-loop fastener is formed in the non-skin opposing surface of the belly side part 1F of the diaper 1. FIG. The to-be-attached region 36 has a female member of a mechanical hook-and-loop fastener on a non-skin facing surface of the back sheet 3 that forms a non-skin facing surface of the ventral side 1F. The fastening portion of the fastening tape 35 can be detachably fastened.

  The absorbent body 4 includes a liquid-retaining absorbent core 40, a skin-side core wrap sheet 41 that covers the skin facing surface of the absorbent core 40, and a non-skin that covers the non-skin facing surface of the absorbent core 40. The side core wrap sheet 42 is included. The absorbent core 40 and the core wrap sheets 41 and 42 are joined to each other via an adhesive such as a hot-melt adhesive. In this embodiment, as described later, the arrangement pattern of the adhesive between the absorbent core 40 and the core wrap sheets 41 and 42 is devised. The absorptive core 40 has a single-layer structure, and in a plan view as shown in FIG. Have.

  The absorbent core 40 includes an absorbent material, and includes a water-absorbing polymer and hydrophilic fibers as the absorbent material. Specific examples of the water-absorbent core 40 include a fiber aggregate containing cellulosic fibers in which water-absorbing polymer particles are held. This fiber assembly is a sheet-like material formed by mechanical entanglement of fibers, adhesion or fusion of fibers, and specific examples include paper, nonwoven fabric, and composites thereof. The water-absorbing polymer particles are three-dimensionally dispersed inside the fiber assembly.

  As the water-absorbing polymer to be contained in the absorbent core 40, those conventionally used for this type of absorbent article can be used without any particular limitation, and in particular, can absorb and hold a liquid 20 times or more of its own weight and Water-absorbing polymers that can be gelled are preferred, for example, starch, crosslinked carboxylmethylated cellulose, polymers or copolymers of acrylic acid or alkali metal acrylates, polyacrylic acid and salts thereof, and polyacrylate graft polymers Is mentioned. The water-absorbing polymer contained in the absorbent core 40 is usually particles having a predetermined shape such as a spherical shape or an elliptical shape. The particle diameter of the water-absorbing polymer particles is preferably 2 to 800 μm, more preferably 50 to 600 μm.

  Examples of hydrophilic fibers contained in the absorbent core 40 include cellulosic fibers. Specifically, softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP), softwood bleached sulfite pulp (NBSP). And wood pulp such as thermomechanical pulp (TMP); non-wood pulp such as straw, bamboo, kenaf, hemp and the like, and these can be used alone or in combination of two or more.

  The skin-side core wrap sheet 41 and the non-skin-side core wrap sheet 42 may be 1) one continuous sheet, or 2) separate sheets. In the case of 1), for example, a single continuous core wrap sheet having a width of 2 to 3 times the length of the absorbent core 40 in the transverse direction Y can be used. In the present embodiment, this one continuous core wrap sheet is adopted, and the skin side core wrap sheet 41 and the non-skin side core wrap sheet 42 constitute one continuous sheet. In the present embodiment, this single continuous core wrap sheet covers the entire skin-facing surface of the absorbent core 40 from both side edges along the longitudinal direction X of the absorbent core 40, as shown in FIG. It extends outward in the lateral direction Y, and the extended portion is wound down below the absorbent core 40 to cover the entire area of the non-skin facing surface of the absorbent core 40. In the wrap sheet, the portion covering the skin facing surface of the absorbent core 40 is the skin side core wrap sheet 41, and the portion covering the non-skin facing surface of the absorbent core 40 is the non-skin side core wrap sheet 42.

  In the case of 2), the length in the width direction Y, that is, the width may be the same or different between the skin-side core wrap sheet 41 and the non-skin-side core wrap sheet 42. If the widths of the two sheets 41 and 42 are different, whichever is longer. For example, the skin-side core wrap sheet 41 has the same width as the maximum width of the skin facing surface of the absorbent core 40, in other words, has a size that can cover the entire skin facing surface of the absorbent core 40. The non-skin-side core wrap sheet 42 can be made wider than the sheet 41. The wide non-skin side core wrap sheet 42 covers the entire area of the non-skin facing surface of the absorbent core 40 and extends outward in the width direction Y from both side edges along the longitudinal direction X of the absorbent core 40. The extending portion may be wound up on the skin-side core wrap sheet 41 disposed to face the skin-facing surface of the absorbent core 40 and cover both side edges along the longitudinal direction X of the sheet 41. .

  As the core wrap sheets 41 and 42, a liquid-permeable sheet material can be used. Conventionally, paper, non-woven fabric, and the like are used as the core wrap sheet in this type of absorbent article, and paper can also be used as the skin side core wrap sheet 41 in this embodiment, but at least the non-skin side core. As the wrap sheet 42, a non-woven fabric is used without using paper. When using one continuous sheet as the core wrap sheet as in the present embodiment, a non-woven fabric is used as the one continuous sheet, and in that case, only the non-skin-side core wrap sheet 42 is used. Moreover, the skin-side core wrap sheet 41 is also a nonwoven fabric. The nonwoven fabric has a property that it has a higher elongation at break than paper and is not easily torn even if it is deformed. Further, as will be described later, the non-skin-side core wrap sheet 42 has a portion of the sheet 42 placed sideways. Since the tack portion 6 folded in the direction Y is formed, a nonwoven fabric is used as at least the non-skin-side core wrap sheet 42 from the viewpoint of ensuring the strength of the tack portion 6. As the nonwoven fabric that can be used as the core wrap sheets 41 and 42, those that can be used as constituent members in this type of absorbent article can be used without particular limitation. For example, air-through nonwoven fabric, heat roll nonwoven fabric, spunlace nonwoven fabric, Spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunbond-meltblown-spunbond nonwoven fabrics, and the like. These non-woven fabrics may be hydrophilic non-woven fabrics made of fibers subjected to hydrophilic treatment.

  The absorbent core 40 is formed with a non-stacking portion 5 formed of holes penetrating the absorbent core 40 in the thickness direction so as to extend in the longitudinal direction X in the crotch portion 1M. As shown in FIG. 1, the unstacked fiber portion 5 in the present embodiment has a rectangular shape, more specifically, a rectangular shape in plan view, and the longitudinal direction of the non-stacked fiber portion 5 coincides with the longitudinal direction X. Two are formed at the center in the direction Y, and extend in the longitudinal direction X through at least the excretory part-facing portion of the crotch 1M. The two non-stacked fiber portions 5 and 5 are formed symmetrically with reference to a virtual vertical center line (not shown) extending in the vertical direction X by dividing the absorbent core 40 or the diaper 1 into the horizontal direction Y. In the skin facing surface of the absorbent core 40, the length in the transverse direction Y, that is, the width of each non-stacked portion 5 is constant over the entire length in the longitudinal direction X. Also in the non-skin facing surface, the width in the transverse direction Y of each non-stacking portion 5 is constant over the entire length in the longitudinal direction X.

  The non-stacked fiber portion 5 is formed by the absorbent core 40 at the time of production of the absorbent core 40, such as fiber material such as wood pulp and absorbent material such as water absorbent polymer particles. It is a part formed by intentionally inhibiting the fiber stacking of the material. The absorbent core 40 having the non-stacked fiber portion 5 can be manufactured according to a conventionally known method for manufacturing an absorbent core. For example, the absorbent material supplied by being put on an air flow is formed on the outer peripheral surface of the rotating drum. In the method of obtaining the absorbent core 40 by sucking and stacking on the formed mold, the mold has a predetermined pattern as the mold, for example, a portion corresponding to the non-stacked portion 5 as compared with the peripheral portion. It can be manufactured by using a mold projecting upward. In the absorbent core 40 obtained by such a manufacturing method, the portion where no absorbent material is present is the non-stacked fiber portion 5. In addition, as another manufacturing method of the absorbent core 40 having the non-stacked fiber portion 5, an absorbent core not having the non-stacked fiber portion is manufactured, and embossing or die cutting processing is performed on a predetermined portion of the absorbent core. Alternatively, a method of forming a non-stacked portion by performing post-processing such as cutting or cutting can be employed.

  As shown in FIG. 2, the skin-side core wrap sheet 41 and the non-skin-side core wrap sheet 42 are joined in the non-stacking portion 5. In this embodiment, the joint part of both the sheets 41 and 42 is unevenly distributed in the non-skin opposing surface side, ie, the back surface sheet 3 side, in the thickness direction of the absorber 4, and the non-skin side core wrap sheet 42 is flat. However, the skin-side core wrap sheet 41 is recessed in a concave shape at the formation position of the non-stacking portion 5. Moreover, in this embodiment, the junction part of both the sheets 41 and 42 is continuing over the full length of the vertical direction X of the non-stacking fiber part 5. FIG.

  The joint part of both the sheets 41 and 42 in the non-stacking part 5 can be formed as follows, for example. That is, an adhesive such as a hot-melt adhesive is applied in advance to the corresponding position of the non-stacked portion 5 in at least one of the sheets 41 and 42, and the absorbent core 40 is covered with the sheets 41 and 42. After obtaining the absorbent body 4, the non-stacked fiber portion 5 of the absorbent body 4 is pressed from the skin facing surface side and the skin-side core wrap sheet 41 is pushed into the non-skin-side core wrap sheet 42 side. In the part 5, both sheets 41 and 42 can be joined via an adhesive. The pressing process of the non-stacked fiber portion 5 can employ known embossing such as embossing or ultrasonic embossing with or without heat. For example, when a heat and pressure treatment such as embossing with heat is employed as the pressing process for the non-fiber stacking part 5, the skin-side core wrap sheet 41 and the non-skin-side core wrap sheet 42 are melted in the non-fiber stacking part 5. The two sheets 41 and 42 can be bonded more firmly than the bonding by the adhesive. In this case, the non-skin-side core wrap sheet 42 is flat, but the skin-side core wrap sheet 41 is recessed in a concave shape at the position where the non-stacking portion 5 is formed. The non-stacking portion 5 may be pressed by pressing the non-skin-side core wrap sheet 42 toward the skin-side core wrap sheet 41 at the position where the non-stacking portion 5 is formed. 5 may be performed by pressing both sheets 41 and 42 at the same time. In the former case, the skin-side core wrap sheet 41 is flat, but the non-skin-side core wrap sheet 42 will be recessed in the formation position of the non-stacked fiber portion 5, and in the latter case, in the non-stacked fiber portion 5 The joint part of both the sheets 41 and 42 is located in the center part of the thickness direction of the absorber 4, and both the sheets 41 and 42 will be depressed in the concave shape in the formation position of the non-stacking part 5, respectively.

  As one of the main features of the diaper 1 of the present embodiment, in a state where the absorbent core 40 (absorber 4) does not absorb liquid, that is, in an unused state, between the absorbent core 40 and the back sheet 3, The point by which the tack part 6 by which a part of non-skin side core wrap sheet | seat 42 was folded by the horizontal direction Y is formed is mentioned. FIG. 3 shows a state where the bonding between the absorber 4 and the back sheet 3 is released and separated from the viewpoint of easy explanation. As shown in FIGS. 2 and 3, one tack portion 6 is formed on each of both side portions in the lateral direction Y on the non-skin facing surface of the absorbent body 4, and the plurality of (two) tack portions 6 are formed. Are formed symmetrically with respect to the center in the lateral direction Y of the absorber 4.

  The tack portion 6 includes a portion where the non-skin-side core wrap sheets 42 and 42 face each other, and is a connecting portion of the facing sheets 42 and 42, and is used when the tack portion 6 is formed. It has the front-end | tip part 6T which is also a bending edge part, and the base end part 6B located in the opposite side to this front-end | tip part 6T. The tack portion 6 is continuous over the entire length of the absorbent body 4 in the longitudinal direction X, and although not shown, the tip portion 6T of the tack portion 6 is longitudinal in the plan view of the non-skin facing surface of the absorbent body 4. A continuous straight line extending in the direction X is formed. The folding direction of the tack portion 6, that is, the direction of the tip portion 6T may be inward or outward in the lateral direction Y. In this embodiment, the tack portion 6 is inward in the lateral direction Y as shown in FIGS. Folded in the direction. The portion of the non-skin-side core wrap sheet 42 where the tack portion 6 is folded is composed of the two opposing sheets 42, 42 constituting the tack portion 6 and the one sheet 42 that is not folded. It has a three-layer structure.

  At least a part of the tack portion 6 overlaps a portion other than the non-stacked fiber portion 5 in the absorbent core 40 in the thickness direction of the absorbent core 40 (diaper 1). That is, in a plan view of the non-skin facing surface of the absorbent body 4, that is, the non-skin side core wrap sheet 42 side, at least a part of the tack portion 6 and a portion other than the non-stacked fiber portion 5 in the absorbent core 40 overlap. . In this embodiment, as shown in FIG.2 and FIG.3, the whole tack part 6 has overlapped with parts other than the non-stacking fiber part 5 in the absorptive core 40, ie, the part in which an absorptive material exists.

  In the diaper 1 of the present embodiment, by joining the skin-side core wrap sheet 41 and the non-skin-side core wrap sheet 42 that cover the absorbent core 40 at the non-stacking portion 5 of the absorbent core 40, The absorbent core 40 moderately inhibits swelling when the excretory fluid such as urine is absorbed, thereby preventing the absorbent material such as the water absorbent polymer from falling off the water absorbent core 40 and absorbing Breakage due to swelling of the core 40 is prevented, and even when a part of the absorbent core 40 is broken, further deterioration of the broken state is prevented. Further, in the diaper 1 of the present embodiment, the absorbent core 40 has a pair of non-stacked fiber portions 5 and 5 functioning as a liquid conduction path in the longitudinal direction X through the excretory portion-facing portion of the crotch 1M. Since it is formed to extend, excretion liquid such as urine excreted from the excretion part of the wearer toward the excretion part facing part and the vicinity thereof passes through the top sheet 2 and flows into the non-stacking part 5 After that, it is diffused back and forth in the longitudinal direction X by the non-stacked fiber portion 5, whereby the absorption capacity of the absorbent core 40 is effectively utilized and the absorption speed is improved.

  On the other hand, as described above, the effect of preventing the breakage of the absorbent core, which is exhibited by suppressing the swelling of the absorbent core by joining the core wrap sheets 41 and 42 in the non-stacked fiber portion 5, and the absorbent core Absorption performance is in a trade-off relationship, and it is feared that suppressing the swelling of the absorbent core with the core wrap sheet will lead to a decrease in the absorbent performance of the absorbent core.

  In response to such concerns, in the diaper 1 of the present embodiment, the tuck portion 6 formed by folding the non-skin-side core wrap sheet 42 is formed on the non-skin-facing surface of the absorbent body 4 to eliminate this concern. In addition, the breakage prevention of the absorbent core and the absorbent performance of the absorbent core are compatible at a high level. That is, the tack portion 6 is a structural member that deforms in accordance with the swelling of the absorbent core 40 and functions as a swelling space, and the absorbent core 40 (absorbent body 4) has not absorbed excretory fluid such as urine. In the use state, as shown in FIG. 2 and FIG. 3, the absorbent core 40 is folded between the absorbent core 40 and the back sheet 3. As it swells, the non-skin-side core wrap sheets 42 and 42 in the tack portion 6 gradually open from the base end portion 6B side with the swelling, and finally in FIG. As shown, the folded state of the non-skin side core wrap sheet 42 forming the tack portion 6 is completely eliminated and disappears. In the process up to the disappearance of the tack portion 6, the absorbent core 40 can sufficiently swell using the swelling space provided by the tack portion 6, so that the absorbent core 40 originally has sufficient absorption performance. Can be used. That is, according to the diaper 1 of the present embodiment, it is possible to prevent the absorbent core from being broken and the absorbent material from falling off the absorbent core without causing a decrease in absorbent performance, and for a long time during wearing. Can exhibit excellent absorption performance.

  If the tack portion 6 is formed on the skin-facing surface of the absorbent body 4, that is, if a part of the skin-side core wrap sheet 41 located between the topsheet 2 and the absorbent core 40 is folded, the absorption The tack portion 6 formed on the skin-facing surface of the body 4 can function as a swelling space for the absorbent core 40. In this case, the skin-side core wrap that should allow the excretory fluid to pass through the absorbent core 40 side quickly. Since the folded portion of the sheet 41 is formed on the sheet 41, the liquid permeability of the sheet 41 is lowered, which may adversely affect the absorption performance. Therefore, in the present embodiment, the tack portion 6 is formed on the non-skin facing surface of the absorber 4.

  Further, if the tack portion 6 is formed by overlapping and joining the end portions of the two core wrap sheets, the tack portion 6 composed of the two sheets becomes a base as the absorbent core 40 swells. In the process of opening from the end portion 6B side, the joining of the two sheets at the tip portion 6T is released and the tip portion 6T opens, and the absorbability of the absorbent core 40 such as a water-absorbing polymer through the opening. Material may leak out. On the other hand, in the present embodiment, since the tack portion 6 is formed by folding one sheet (non-skin side core wrap sheet 42), the one end portion of the front end portion 6T that is the folded end portion is the one sheet. As described above, there is no possibility that the tip portion 6T opens during the swelling process of the absorbent core 40 as described above, and the absorbent material is effectively prevented from falling off.

  From the viewpoint that the tack portion 6 is quickly and reliably deformed as the absorbent core 40 swells, and the swelling space of the absorbent core 40 is smoothly provided by the tack portion 6, FIG. 2 and FIG. The non-skin-side core wrap sheets 42 and 42 facing each other in the folded tack portion 6 as shown in the figure are either (1) not joined to each other, or (2) joined to each other, but the joining force is It is preferable that the bonding strength between the skin-side core wrap sheet 41 and the non-skin-side core wrap sheet 42 in the non-stacking portion 5 is weak. In the case of (1), the non-skin-side core wrap sheets 42 and 42 facing each other in the tack portion 6 are not joined to each other by a joining means such as an adhesive, but are simply overlapped.

  In the case of (2), an adhesive such as a hot-melt adhesive can be used as a joining means for joining the non-skin-side core wrap sheets 42 and 42 facing each other in the tack portion 6. As a method for realizing the above-mentioned relationship of “the joining force of the sheets 42 and 42 in the tack portion 6 <the joining force of the sheets 41 and 42 in the non-stacking fiber portion 5”, for example, i) relative to the tack portion 6 A method of using an adhesive having a low adhesive strength and using an adhesive having a relatively high adhesive strength in the non-stacking portion 5; ii) bonding the basis weight of the adhesive in the tack portion 6 to the non-stacking portion 5; The method of making it less than the basic weight of an agent is mentioned.

  Each of the methods i) and ii) is a method of relatively reducing the bonding force in the tack portion 6, but iii) the method of relatively increasing the bonding force of the non-stacked fiber portion 5 also It is possible to realize a magnitude relationship of “the bonding force between the sheets 42 and 42 in the tack portion 6 <the bonding force of the sheets 41 and 42 in the non-stacking fiber portion 5”. That is, for example, when the skin-side core wrap sheet 41 and the non-skin-side core wrap sheet 42 are fused in the non-stacked fiber portion 5, the joining force of both sheets 41, 42 by the fusion is usually tack. Since it is stronger than the joining force between the non-skin side core wrap sheets 42 and 42 facing each other that are joined to each other by the adhesive in the portion 6, the magnitude relationship of the joining force is realized. Examples of the method for fusing both sheets 41 and 42 in the non-stacked fiber portion 5 include the pressing process of the non-stacked fiber portion 5, particularly a heat and pressure process such as embossing with heat.

The basis weight of the adhesive when the skin-side core wrap sheet 41 and the non-skin-side core wrap sheet 42 are joined with an adhesive in the non-stacking portion 5 (when the sheets 41 and 42 are not fused) is preferably 2 g / m ² or more, more preferably 3 g / m ² or more, and preferably 10 g / m ² or less, more preferably 8 g / m ² or less, more specifically preferably 2 g / m ² or more and 10 g / m ^2. Hereinafter, it is more preferably 3 / m ² or more and 8 g / m ² or less.
On the other hand, the basis weight of the adhesive when the non-skin-side core wrap sheets 42 and 42 facing each other in the tack portion 6 are joined by an adhesive is preferably 1 g / m ² or more, more preferably 2 g / m ² or more. And preferably 9 g / m ² or less, more preferably 8 g / m ² or less, more specifically preferably 1 g / m ² or more and 9 g / m ² or less, more preferably 2 g / m ² or more and 8 g / m ² or less. ² or less.

  In the present embodiment, as shown in FIG. 3, a portion other than the non-stacked fiber portion 5 in the absorbent core 40, that is, a portion where the absorbent material exists, a skin-side core wrap sheet 41, and a non-skin-side core wrap sheet 42. Are joined via a non-skin-side adhesive application part 45, a skin-side adhesive application part 46, and a side adhesive application part 47 formed by applying an adhesive such as a hot-melt adhesive. By these adhesive application portions 45, 46, 47, the core wrap sheets 41, 42 are effectively prevented from being displaced from their proper positions, and the above-described operational effects can be achieved more reliably.

  As shown in FIG. 3, between the non-skin facing surface of the absorbent core 40 and the non-skin-side core wrap sheet 42, one total is provided for each of the central portion and both side portions of the absorbent core 40 in the lateral direction Y. Adhesives are applied to three locations, whereby continuous linear non-skin-side adhesive applicators 45 extending in the longitudinal direction X in plan view are formed at each of the three locations. The plurality of (three) non-skin side adhesive application portions 45 are intermittently arranged in the lateral direction Y and do not overlap the tack portion 6. That is, in the portion where the non-skin facing surface of the absorbent core 40, that is, the absorbent material is present, no adhesive is applied to the portion overlapping the tack portion 6 in plan view, and the non-skin side adhesive application portion 45 is not applied. Is not formed. With such a configuration, the non-skin-side core wrap sheet 42 is firmly fixed to an appropriate position on the non-skin-facing surface of the absorbent core 40 via the non-skin-side adhesive application part 45, and the absorbent core 40 is swollen. Sometimes, it becomes possible to quickly open between the non-skin-side core wrap sheets 42 and 42 facing each other in the tack portion 6 from the base end portion 6B side, and the space necessary for the swelling of the absorbent core 40 becomes the tack portion 6. Will be provided promptly.

  From the viewpoint of promptly providing the space necessary for swelling of the absorbent core 40 by the tack portion 6, the non-skin facing surface and the non-skin side core wrap of the absorbent core 40 by the non-skin side adhesive application portion 45. The joining force with the sheet 42 is preferably weaker than the joining force between the skin-side core wrap sheet 41 and the non-skin-side core wrap sheet 42 in the non-stacking portion 5. As a method of realizing the magnitude relationship of “the bonding force between the non-skin facing surface of the absorbent core 40 and the non-skin-side core wrap sheet 42 <the bonding force of the sheets 41 and 42 in the non-stacking portion 5”, for example, In accordance with i), a method using an adhesive having a relatively low adhesive strength in the non-skin-side adhesive application portion 45 and using an adhesive having a relatively high adhesive strength in the non-stacked fiber portion 5 is used. Can be mentioned. Moreover, according to said ii), the method of making the basic weight of the adhesive agent in the non-skin side adhesive application part 45 smaller than the basic weight of the adhesive agent in the non-stacking fiber part 5 is mentioned. Further, as in the above iii), the skin-side core wrap sheet 41 and the non-skin-side core wrap sheet 42 are fused in the non-stacking portion 5 so that the bonding force of the non-stacking portion 5 is non-skin-side adhesive. A method of increasing the bonding force by the application unit 45 may be used.

  Moreover, as shown in FIG. 3, between the skin facing surface of the absorbent core 40 and the skin-side core wrap sheet 41, there are two in the central portion in the lateral direction Y of the absorbent core 40 and one in each of both sides. The adhesive is applied to a total of four locations, whereby continuous linear skin-side adhesive application portions 46 extending in the longitudinal direction X in plan view are formed at each of the four locations. In this embodiment, these plural (four) skin-side adhesive application portions 46 and plural (three) non-skin-side adhesive application portions 45 are the thickness of the absorbent core 40 (diaper 1). Does not overlap in direction. That is, the non-skin-side adhesive application part 45 and the skin-side adhesive application part 46 do not overlap in the plan view of the absorbent body 4.

  Both the non-skin-side adhesive application portion 45 and the skin-side adhesive application portion 46 serve to reduce the degree of freedom of movement of the absorbent core 40 in the space surrounded by the core wrap sheets 41 and 42, and absorb the absorption. The destruction of the absorbent core 40 is effectively prevented by reducing the freedom of movement of the absorbent core 40. In order to reduce the degree of freedom of movement of the absorbent core 40, it is sufficient that at least one of the non-skin-side adhesive application part 45 and the skin-side adhesive application part 46 exists. good. A particularly preferable arrangement pattern of the adhesive application portions 45 and 46 is “one virtual straight line (not shown) that vertically cuts the absorbent body 4 in the longitudinal direction X in a plan view of the absorbent body 4 as shown in FIG. When drawn, it is an “arrangement pattern in which the one virtual straight line and the non-skin-side adhesive application part 45 or the skin-side adhesive application part 46 overlap”. In other words, “when the arrangement pattern of the non-skin-side adhesive application part 45 and the arrangement pattern of the skin-side adhesive application part 46 are virtually superimposed, the entire virtual region formed by the superposition is The “arrangement pattern covered with the non-skin-side adhesive application part 45 and / or the skin-side adhesive application part 46” is particularly preferable.

  Further, as shown in FIG. 3, both sides along the longitudinal direction X of the absorbent core 40, that is, a portion sandwiched between the skin facing surface and the non-skin facing surface on the outer surface of the absorbent core 40, and covering the portion The core wrap sheet is joined via the side adhesive application part 47. The plan view shape of the side adhesive application portion 47 (the shape in the side view of the absorbent core 40) is not particularly limited, and may be, for example, a continuous linear shape extending over the entire length in the longitudinal direction X of the absorbent core 40. The shape may be discontinuous. In the present embodiment, the skin-side core wrap sheet 41 and the non-skin-side core wrap sheet 42 constitute one continuous sheet, and the one continuous core wrap sheet is a side adhesive application portion. In order to adhere securely to the side of the absorbent core 40 via 47, the absorbent core 40 is compared with the case where separate sheets are used as the skin-side core wrap sheet 41 and the non-skin-side core wrap sheet 42, respectively. The effect of preventing damage is more reliably exhibited.

The basis weight of the adhesive in the non-skin side adhesive application part 45 is preferably 2 g / m ² or more, more preferably 3 g / m ² or more, and preferably 10 g / m ² or less, more preferably 8 g / m ^2. Hereinafter, more specifically, it is preferably 2 g / m ² or more and 10 g / m ² or less, and more preferably 3 / m ² or more and 8 g / m ² or less.
The basis weight of the adhesive in the skin side adhesive application part 46 is preferably 2 g / m ² or more, more preferably 3 g / m ² or more, and preferably 10 g / m ² or less, more preferably 8 g / m ² or less. More specifically, it is preferably 2 g / m ² or more and 10 g / m ² or less, more preferably 3 / m ² or more and 8 g / m ² or less.
The basis weight of the adhesive in the side adhesive application part 47 is preferably 2 g / m ² or more, more preferably 3 g / m ² or more, and preferably 10 g / m ² or less, more preferably 8 g / m ² or less. More specifically, it is preferably 2 g / m ² or more and 10 g / m ² or less, more preferably 3 / m ² or more and 8 g / m ² or less.

The top sheet 2 and the back sheet 3 and the absorber 4 are respectively joined by an adhesive, thereby preventing the absorber 4 from being displaced from the appropriate position. Between the top sheet 2 and the absorber 4, an adhesive may be applied and joined at an arbitrary position. However, between the back sheet 3 and the absorber 4, the function of the tack portion 6 described above. It is necessary to pay attention to the position of the adhesive so as not to hinder. From this point of view, in this embodiment, as shown in FIG. 3, the absorber 4 is joined to the back sheet 3 and the adhesive application part 48 at a part other than the tack part 6. The adhesive application part 48 has a continuous line shape extending in the vertical direction X in plan view, and a plurality (five) of adhesive application parts 48 are intermittently arranged in the horizontal direction Y. In FIG. 3, the absorber 4 and the back sheet 3 are shown separately from the viewpoint of easy explanation, but actually, the absorber 4 and the back sheet 3 are joined via the adhesive application part 48. doing. With this configuration, the absorbent body 40 and the back sheet 3 are firmly fixed via the adhesive 48 to prevent unintentional misalignment, and when the absorbent core 40 swells, the opposing non-skin in the tack portion 6 It becomes possible to quickly open between the side core wrap sheets 42, 42 from the base end portion 6B side. The basis weight of the adhesive application part 48 is preferably 2 g / m ² or more, more preferably 3 g / m ² or more, and preferably 50 g / m ² or less, more preferably 25 g / m ² or less, more specifically. Is preferably 2 g / m ² or more and 50 g / m ² or less, more preferably 3 g / m ² or more and 25 g / m ² or less.

  The water-absorbing polymer contained in the absorbent core 40 is normally distributed uniformly throughout the absorbent core 40. However, by making the water-absorbent polymer unevenly distributed in the absorbent core 40, the above-described absorbent core 40 has a uniform distribution. It is possible to promote deformation of the tack portion 6 accompanying swelling. In other words, in the thickness direction of the absorbent core 40, the water-absorbing polymer is present more on the non-skin facing surface side, that is, the side near the back sheet 3, than on the skin facing surface side, that is, the side close to the top sheet 2. Since the degree of swelling due to liquid absorption on the non-skin facing surface side of the absorbent core 40 is larger than when the water-absorbing polymer is uniformly distributed in the absorbent core 40, the tack portion 6 is formed on the basis of the tack portion 6. As a result, the force of opening from the end portion 6B side is increased, and as a result, the deformation of the tack portion 6 accompanying the swelling of the absorbent core 40 occurs rapidly, and the provision of the swollen space of the absorbent core 40 by the tack portion 6 becomes even faster. And it will be made surely.

  Moreover, it is preferable that the non-skin-side core wrap sheets 42 and 42 facing each other in the folded tack portion 6 are in close contact with each other. In other words, it is preferable that an absorbent material such as a water-absorbing polymer and a space portion do not exist between the non-skin-side core wrap sheets 42 and 42 facing each other in the folded tack portion 6. With such a configuration, it is difficult for excretion fluid such as urine to move into the inside of the tack portion 6, so that the tack portion 6 is not deformed until a certain amount of excretion fluid is absorbed by the absorbent core 40. In addition, while maintaining the folded state, the swelling of the absorbent core 40 is suppressed to prevent destruction, and when the amount of excretory liquid absorbed by the absorbent core 40 exceeds a predetermined amount, the absorbent core 40 is quickly deformed to be deformed. Thus, it is possible to provide both the prevention of destruction of the absorbent core 40 and the absorption performance of the absorbent core 40 at a higher level.

From the standpoint of ensuring the above-described effects, the dimensions and the like of each part in the absorbent body 4 are preferably in the following ranges.
The length in the longitudinal direction X of the non-stacked fiber portion 5 is preferably 20% or more, more preferably 30% or more, and preferably 60% or less with respect to the length of the absorbent core 40 in the longitudinal direction X. More preferably, it is 50% or less, more specifically, preferably 20% or more and 60% or less, more preferably 30% or more and 50% or less.
The length or width in the lateral direction Y of the non-stacked fiber portion 5 is preferably 2 mm or more, more preferably 3 mm or more, and preferably 15 mm or less, more preferably 10 mm or less, more specifically preferably 2 mm or more. It is 15 mm or less, More preferably, it is 3 mm or more and 10 mm or less.
In a state where the absorbent core 40 (absorber 4) does not absorb liquid, that is, in an unused state, the length of the folded tack portion 6 in the lateral direction Y, that is, the base end portion 6B and the tip end portion 6T Is preferably 1 mm or more, more preferably 2 mm or more, and preferably 10 mm or less, more preferably 5 mm or less, more specifically, preferably 1 mm or more and 10 mm or less, more preferably 2 mm or more and 5 mm or less. is there.
The basis weight of the absorbent core 40 is preferably 200 g / m ² or more, more preferably 300 g / m ² or more, and preferably 800 g / m ² or less, more preferably 700 g / m ² or less, more specifically. , preferably 200 g / ^{m 2} or more 800 g / ^{m 2} or less, more preferably 300 g / ^{m 2} or more 700 g / ^{m 2} or less.

  5 and 6 show another embodiment of the absorbent body according to the present invention. In other embodiments to be described later, constituent parts different from those of the absorbent body 4 in the above-described embodiment will be mainly described, and the same constituent parts are denoted by the same reference numerals and description thereof will be omitted. The description of the above embodiment is applied as appropriate to components that are not particularly described.

  In the absorbent body 4A, as shown in FIG. 5, the non-stacked fiber portion 5 is formed in the absorbent core 40A so as to extend in both the vertical direction X and the horizontal direction Y. That is, in the absorbent core 40A, two non-stacked portions 5 having a rectangular shape in plan view extending in the vertical direction X are formed in the center of the horizontal direction Y of the absorbent core 40A and extend in the horizontal direction Y. The non-stacked fiber portion 5 having a rectangular shape in plan view is formed so as to intersect (orthogonally) the two non-stacked fiber portions 5 extending in the longitudinal direction X. One or more non-stacked fiber portions 5 extending in the lateral direction Y are formed on each of the abdominal side portion 1F, the crotch portion 1M, and the back side portion 1R, and the side edges or the longitudinal edges X along the longitudinal direction X of the absorbent core 40, respectively. The neighborhood has been reached. Thus, the non-stacking part 5 is formed in the absorptive core 40A in the shape of a lattice, so that the absorbent core 40A includes a part where the absorbent material is present and the non-stacking part 5 surrounding the part. Is present. The absorbent core 40A is formed so that the fiber stacking portion 5 that functions as a conduction path for excretion fluid such as urine extends in both the vertical direction X and the horizontal direction Y, thereby making the liquid diffusibility in both directions. Therefore, it is easier to absorb the liquid at both sides in the lateral direction Y than in the central portion in the lateral direction Y, in particular, the portion sandwiched between the two non-stacked fibers 5 and 5 extending in the longitudinal direction X. "Has a characteristic absorption characteristic.

  And in absorber 4A provided with absorptive core 40A which has such a characteristic absorption characteristic, tack part 6 is formed in consideration of the absorption characteristic. Specifically, as shown in FIG. 6, the tack portion 6 includes a central portion in the lateral direction Y of the absorbent body 4A, that is, a portion sandwiched between a pair of non-stacked fiber portions 5 and 5 extending in the longitudinal direction X, and a lateral direction. It is formed on both sides of Y, that is, on the outer side in the lateral direction Y than the pair of non-stacked fiber portions 5 and 5, and each side on both sides in the lateral direction Y is compared to the central portion in the lateral direction Y. The number of tack portions 6 is large. In FIG. 6, two tack portions 6 are formed at the central portion in the lateral direction Y of the absorbent body 4 </ b> A, and three tack portions 6 are formed at both side portions in the lateral direction Y, respectively. The portions 6 are in close contact with each other to form one tack portion group. The arrangement pattern of the tack portion 6 is swelled by absorption of excretory fluid in consideration of the absorption characteristic of the absorbent core 40A that “the side portion absorbs liquid more easily than the central portion in the lateral direction Y”. The number of tack portions 6 (a tack composed of a number of tack portions 6) is larger than the center portion on each side portion in the lateral direction Y of the absorbent body 4A, which is expected to be greater than the central portion in the lateral direction Y. Part group). The greater the number of tack portions 6 constituting the tack portion group, the wider the portion of the absorbent core 40A that overlaps with the tack portion group and the swelling space in the vicinity thereof.

  Although the present invention has been described above, the present invention is not limited to the above-described embodiments and can be modified as appropriate. For example, in the above-described embodiment, the number of non-stacking portions 5 in the absorbent core 40 is two, but may be one or three or more. For example, when one non-stacked fiber portion 5 is formed in the absorbent core 40, the single non-stacked fiber portion 5 is divided into the longitudinal direction X by dividing the absorbent core 40 into the transverse direction Y and extending in the longitudinal direction X. It can be formed on Lx (see FIG. 3). The absorbent article of the present invention is not limited to the deployable disposable diaper as in the above embodiment, and widely includes articles used to absorb body fluids such as urine, menstrual blood, loose stool and sweat discharged from the human body, Pants-type disposable diapers, sanitary napkins, sanitary shorts, and the like are also included. The following additional notes are disclosed with respect to the embodiment of the present invention described above.

<1>
It comprises a liquid-retaining absorbent body and a back sheet disposed on the non-skin facing surface side of the absorbent body, and has a longitudinal direction corresponding to the wearer's front-rear direction and a lateral direction perpendicular thereto, and is worn An absorbent article having a crotch part arranged in the crotch part of the person,
The absorbent body includes an absorbent core containing a water-absorbing polymer and hydrophilic fibers, a skin-side core wrap sheet covering the skin-facing surface of the absorbent core, and a non-skin-covering surface of the absorbent core. A skin-side core wrap sheet, and at least the non-skin-side core wrap sheet is made of a nonwoven fabric,
In the absorbent core, a non-stacked portion comprising holes penetrating the absorbent core in the thickness direction is formed to extend in the longitudinal direction in the crotch portion, and the skin-side core wrap sheet is formed in the non-stacked portion. The non-skin side core wrap sheet is joined,
In a state where the absorbent core is not absorbing liquid, a tack portion in which a part of the non-skin side core wrap sheet is folded in a lateral direction is formed between the absorbent core and the back sheet. An absorbent article in which at least a part of the tack portion overlaps with a portion of the absorbent core other than the unstacked portion in the thickness direction of the absorbent core.

<2>
The non-skin-side core wrap sheets facing each other in the folded-up tack part are not joined to each other or joined to each other, but the joining force is the skin side in the non-stacking part. The absorbent article according to <2>, which is weaker than a bonding force between the core wrap sheet and the non-skin side core wrap sheet.
<3>
The absorbent article according to <1> or <2>, wherein the skin-side core wrap sheet and the non-skin-side core wrap sheet are fused in the non-stacked fiber portion.

<4>
An adhesive is applied between the non-skin facing surface of the absorbent core and the non-skin-side core wrap sheet, and a plurality of continuous non-skin-side adhesive application portions extending in the vertical direction in plan view are formed. The absorbent article according to any one of <1> to <3>, wherein the plurality of non-skin-side adhesive-applied portions are intermittently arranged in a lateral direction and do not overlap with the tack portion.
<5>
The basis weight of the adhesive in the non-skin side adhesive application part is preferably 2 g / m ² or more, more preferably 3 g / m ² or more, and preferably 10 g / m ² or less, more preferably 8 g / m ^2. The absorbent article according to <4>, wherein:
<6>
The bonding force between the non-skin-facing surface of the absorbent core and the non-skin-side core wrap sheet by the non-skin-side adhesive application part is the skin-side core wrap sheet and the non-skin-side core wrap in the non-stacking part. The absorbent article according to <4> or <5>, which is weaker than a bonding force with the sheet.
<7>
An adhesive is applied between the skin-facing surface of the absorbent core and the skin-side core wrap sheet, and a continuous linear skin-side adhesive application portion extending in the vertical direction in plan view is formed,
In a plan view of the absorber, when one imaginary straight line that vertically cuts the absorber is drawn at an arbitrary position, the one imaginary straight line and the skin-side adhesive-applied portion or the non-skin-side adhesive The absorbent article as described in any one of said <4>-<6> with which an agent application part overlaps.
<8>
The basis weight of the adhesive in the skin side adhesive application part is preferably 2 g / m ² or more, more preferably 3 g / m ² or more, and preferably 10 g / m ² or less, more preferably 8 g / m ² or less. The absorbent article according to <7>, wherein

<9>
The absorbent article according to any one of <1> to <8>, wherein the absorbent body is bonded to the back sheet via an adhesive at a portion other than the tack portion.
<10>
The basis weight of the adhesive application part that joins the absorber and the back sheet is preferably 2 g / m ² or more, more preferably 3 g / m ² or more, and preferably 50 g / m ² or less, more preferably Absorbent article as described in said <9> which is 25 g / m < ² > or less.
<11>
The non-stacked fiber portion is formed in the absorbent core so as to extend in both the vertical and horizontal directions,
The tack portions are formed at the center portion and both side portions in the lateral direction of the absorber, and each of the lateral side portions has a larger number of the tack portions than the lateral center portion. The absorbent article as described in any one of <1>-<10>.

<12>
The absorbent article according to any one of <1> to <11>, wherein the skin-side core wrap sheet and the non-skin-side core wrap sheet constitute one continuous sheet.
<13>
<1> to <12> in which the joint portion between the skin-side core wrap sheet and the non-skin-side core wrap sheet in the non-stacked fiber portion is continuous over the entire length in the vertical direction of the non-stacked fiber portion. The absorbent article as described in any one of these.
<14>
The tack portion is configured to include two sheets facing each other generated by folding the non-skin-side core wrap sheet, and is a connecting portion of the two sheets facing each other, Absorbency as described in any one of said <1>-<13> which has the front-end | tip part which is also a bending end part at the time of forming a tack part, and the base end part located on the opposite side to this front-end | tip part. Goods.
<15>
The tack portion is continuous over the entire length in the longitudinal direction of the absorber, and the tip portion of the tack portion has a continuous linear shape extending in the longitudinal direction in a plan view of the non-skin facing surface of the absorber. Absorbent article as described in <14> above.
<16>
The absorbent article according to any one of <1> to <15>, wherein the tack portion is folded inward in the lateral direction.
<17>
Absorption as described in any one of said <1>-<16> in which the whole said tack part has overlapped with parts (part in which an absorptive material exists) other than the said unstacked fiber part in the said absorptive core. Sex goods.

<18>
In the non-stacking part, the skin-side core wrap sheet and the non-skin-side core wrap sheet are bonded to each other without being fused, and the basis weight of the adhesive is preferably 2 g / m. The absorbent article according to any one of <1> to <17>, which is ² or more, more preferably 3 g / m ² or more, and preferably 10 g / m ² or less, more preferably 8 g / m ² or less. .
<19>
The non-skin side core wrap sheets facing each other in the tack part are joined together by an adhesive, and the basis weight of the adhesive is preferably 1 g / m ² or more, more preferably 2 g / m ² or more, and The absorbent article according to any one of <1> to <18>, preferably 9 g / m ² or less, more preferably 8 g / m ² or less.
<20>
The absorbent article according to <18> or <19>, wherein the basis weight of the adhesive in the tack portion is smaller than the basis weight of the adhesive in the non-stacked portion.
<21>
Both side portions along the longitudinal direction of the absorbent core (a portion sandwiched between the skin facing surface and the non-skin facing surface on the outer surface of the absorbent core) and a core wrap sheet covering the both side portions (the skin side core) The wrap sheet and / or the non-skin-side core wrap sheet) is the absorbent article according to any one of <1> to <20>, which is joined via a side adhesive application portion.
<22>
The basis weight of the adhesive in the side adhesive application part is preferably 2 g / m ² or more, more preferably 3 g / m ² or more, and preferably 10 g / m ² or less, more preferably 8 g / m ² or less. The absorbent article according to <21>, wherein

<23>
In a state where the absorbent core is not absorbing liquid (unused state), the lateral length of the tack portion in the folded state (the separation distance between the base end portion and the tip end portion) is preferably The absorbent article according to any one of <1> to <22>, which is 1 mm or more, more preferably 2 mm or more, and preferably 10 mm or less, more preferably 5 mm or less.
<24>
The absorptive according to any one of <1> to <23>, wherein the water-absorbing polymer is present more on the non-skin facing surface side than on the skin facing surface side in the thickness direction of the absorbent core. Goods.
<25>
The absorbent article according to any one of <1> to <24>, wherein the non-skin side core wrap sheets facing each other in the folded tack portion are in close contact with each other.
<26>
The longitudinal length of the non-stacked fiber portion is preferably 20% or more, more preferably 30% or more, and preferably 60% or less, more preferably 50%, with respect to the longitudinal length of the absorbent core. % Or less, The absorbent article as described in any one of said <1>-<25>.
<27>
Any one of the above items <1> to <26>, wherein the lateral length or width of the non-stacked fiber portion is preferably 2 mm or more, more preferably 3 mm or more, and preferably 15 mm or less, more preferably 10 mm or less. The absorbent article according to one item.

1 disposable diaper (absorbent article)
1F Abdominal side 1M Crotch 1R Back side 2 Top sheet 3 Back sheet 4, 4A Absorbent body 40, 40A Absorbent core 41 Skin side core wrap sheet 42 Non skin side core wrap sheet 45 Non skin side adhesive application part 46 Skin side adhesive application part 5 Non-stacking part 6 Tack part 6B Base end part of tack part 6T Tip part of tack part X Longitudinal direction Y Lateral direction

Claims (8)

It comprises a liquid-retaining absorbent body and a back sheet disposed on the non-skin facing surface side of the absorbent body, and has a longitudinal direction corresponding to the wearer's front-rear direction and a lateral direction perpendicular thereto, and is worn An absorbent article having a crotch part arranged in the crotch part of the person,
The absorbent body includes an absorbent core containing a water-absorbing polymer and hydrophilic fibers, a skin-side core wrap sheet covering the skin-facing surface of the absorbent core, and a non-skin-covering surface of the absorbent core. A skin-side core wrap sheet, and at least the non-skin-side core wrap sheet is made of a nonwoven fabric,
In the absorbent core, a non-stacked portion comprising holes penetrating the absorbent core in the thickness direction is formed to extend in the longitudinal direction in the crotch portion, and the skin-side core wrap sheet is formed in the non-stacked portion. The non-skin side core wrap sheet is joined,
In a state where the absorbent core is not absorbing liquid, a tack portion in which a part of the non-skin side core wrap sheet is folded in a lateral direction is formed between the absorbent core and the back sheet. An absorbent article in which at least a part of the tack portion overlaps with a portion of the absorbent core other than the unstacked portion in the thickness direction of the absorbent core.   The non-skin-side core wrap sheets facing each other in the folded-up tack part are not joined to each other or joined to each other, but the joining force is the skin side in the non-stacking part. The absorbent article according to claim 1, wherein the absorbent article is weaker than a bonding force between the core wrap sheet and the non-skin side core wrap sheet.   The absorbent article according to claim 1 or 2, wherein the skin-side core wrap sheet and the non-skin-side core wrap sheet are fused in the non-stacking portion.   An adhesive is applied between the non-skin facing surface of the absorbent core and the non-skin-side core wrap sheet, and a plurality of continuous non-skin-side adhesive application portions extending in the vertical direction in plan view are formed. The absorptive article according to any one of claims 1 to 3, wherein the plurality of non-skin-side adhesive-applied portions are intermittently arranged in a lateral direction and do not overlap with the tack portion.   The bonding force between the non-skin-facing surface of the absorbent core and the non-skin-side core wrap sheet by the non-skin-side adhesive application part is the skin-side core wrap sheet and the non-skin-side core wrap in the non-stacking part. The absorbent article according to claim 4, which is weaker than a bonding force with a sheet. An adhesive is applied between the skin-facing surface of the absorbent core and the skin-side core wrap sheet, and a continuous linear skin-side adhesive application portion extending in the vertical direction in plan view is formed,
In a plan view of the absorber, when one imaginary straight line that vertically cuts the absorber is drawn at an arbitrary position, the one imaginary straight line and the skin-side adhesive-applied portion or the non-skin-side adhesive The absorptive article according to claim 4 or 5 which overlaps with an agent application part.   The absorbent article according to any one of claims 1 to 6, wherein the absorber is joined to the back sheet via an adhesive at a portion other than the tack portion. The non-stacked fiber portion is formed in the absorbent core so as to extend in both the vertical and horizontal directions,
The tack portion is formed at a lateral center portion and both side portions of the absorber, and each of the lateral side portions has a larger number of tack portions than the lateral center portion. Item 8. The absorbent article according to any one of Items 1 to 7.

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