JP6333223B2 - Absorbent articles - Google Patents

Description

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

  2. Description of the Related Art In recent years, in an absorbent article such as a disposable diaper, various improvements have been studied in order to realize good comfort while preventing leakage of excrement such as urine. For example, Patent Literature 1 discloses an absorbent article in which at least a joint portion between a topsheet and an absorbent body is formed, and the absorbent body has a predetermined basis weight. 1 region and a second region having a lower basis weight of the absorbent than the first region, the second region extending along the longitudinal direction of the absorbent article, and An absorbent article is disclosed, which is sandwiched between the first regions in the width direction of the absorbent article and the joining portion is formed in the second region. According to the absorbent article disclosed in Patent Document 1, even if a joint portion is provided, side leakage can be more reliably prevented without deteriorating the wearing feeling to the wearer.

  Patent Document 2 discloses an absorbent article having a joint for joining a liquid-permeable layer and an absorbent core, wherein the absorbent core includes hydrophilic fibers and a superabsorbent polymer as absorbent materials. And having a first region having a predetermined absorbent material basis weight and a second region having a lower absorbent material basis weight than the first region, the absorbency in the second region The ratio of the superabsorbent polymer basis weight with respect to material basis weight is 10 / 100-47 / 100, and the absorbent article by which the said junction part is formed inside the said 2nd area | region is disclosed. According to the absorbent article disclosed in Patent Document 2, even if the joint portion that joins the liquid-permeable layer and the absorbent core is formed in the low basis weight region of the absorbent core, sufficient bending flexibility of the joint portion. It is said that it is possible to combine the properties, sufficient bonding strength of the bonded portion, and sufficient liquid absorbency.

JP 2010-233839 A JP 2014-136126 A

Like these absorbent articles disclosed in Patent Documents 1 and 2, the low fiber density region of the absorbent body (absorbent core) (that is, the basis weight of fibers such as hydrophilic fibers constituting the absorbent body is relatively When a joining portion (squeezed portion) formed by compressing at least the absorbent body in the thickness direction by embossing or the like is provided along the longitudinal direction of the absorbent article in a small area), the wearer removes the absorbent article. When worn, the squeezed part can function as a folding base point of the absorbent body to induce deformation of the absorbent body, so that the absorbent article is deformed into an appropriate shape according to the body shape and movement of the wearer. , Excrement can be efficiently absorbed and retained.
However, in the absorbent articles disclosed in Patent Documents 1 and 2, the pressing portion has a high fiber density region in the width direction of the absorbent article (that is, the basis weight of fibers such as hydrophilic fibers constituting the absorbent body). Relatively high area), even if the absorbent body is bent with the compressed part as a starting point, the high fiber density areas adjacent to both sides of the compressed part interfere with each other (collision). As a result, there is a possibility that it cannot be bent sufficiently. In particular, after the absorber absorbs liquid excrement such as urine, the high fiber density regions adjacent to both sides of the compressed portion are more likely to interfere (collision) due to expansion of the absorber (i.e., Since the absorbent article is difficult to bend and the absorbent article is difficult to be deformed into an appropriate shape according to the body shape and movement of the wearer, the excretion cannot be absorbed and retained efficiently. There was a risk of inducing leaks.
Furthermore, since the said pressing part is pressed and hardened by embossing etc., since it is exposed to the surface of the surface sheet or the skin surface side of an absorber, a wearer's skin surface is a surface sheet of an absorbent article. When the surface is touched, the hardness of the squeezed part is easily sensed directly from the surface of the surface sheet or indirectly through the surface sheet, and there is a possibility that the feel of the absorbent article, the feeling of wearing, etc. may be impaired. there were.

  Therefore, the present invention is an absorbent article that is easily deformed into a predetermined shape before and after absorption of excrement, can efficiently absorb and retain excrement, and is excellent in touch and wearing feeling. The purpose is to provide.

  The absorbent article which concerns on 1 aspect (aspect 1) of this invention is an absorbent article provided with the absorber which has a length direction, a width direction, and thickness direction and contains an absorptive fiber at least, The said absorption The body includes a deformation guiding portion extending in a predetermined direction and a base portion extending on both sides of the deformation guiding portion, and the deformation guiding portion extends in the predetermined direction and extends from the base portion to the skin surface side. Two first convex portions projecting, at least one second convex portion extending in the predetermined direction between the two first convex portions and projecting to the skin surface side, and the first convex A pressing region that includes a pressing portion that extends in the predetermined direction between the shape portion and the second convex portion and that compresses the absorber in the thickness direction, and the first convex portion. And each fiber density of the said 2nd convex-shaped part is lower than the fiber density of the said base, In the said absorbent article. That.

In the absorbent article according to this aspect 1, the absorbent body includes the deformation induction portion and the base portion, and the deformation induction portion has a lower fiber density than the base portion. It has a specific structure including the at least one second convex portion having a fiber density lower than that of the base portion and the pressing region between the first convex portion and the second convex portion. Between the base and the first convex part (specifically, between the base and one first convex part and between the base and the other first convex part), Between the first convex part and the pressing area, and between the second convex part and the pressing area (specifically, between the second convex part and one pressing area, and Each boundary portion between the second convex portion and the other compressed area is easily bent to the skin surface side due to the rigidity difference of the absorber, To ability, an absorber, and thus the absorbent article, predetermined shape (e.g., shape that is convex on the non-skin side) can be easily deformed to. As a result, the absorbent article according to the first aspect can efficiently absorb excrement since it can be deformed in accordance with the wearer's body shape and movement when force is applied to the absorbent body by the wearer's buttocks or the like. Furthermore, the discomfort caused by the excrement adhering to the skin surface of the wearer can be reduced.
Further, in the absorbent article according to the first aspect, the deformation guide portion of the absorbent body is between the first convex portion and the second convex portion, that is, one first convex portion and the second convex portion. A pressing region including the pressing portion that hardly expands even when liquid excretion is absorbed between the protruding portion and between the other first protruding portion and the second protruding portion. And the squeezing region is provided so as to be spaced apart from each other with the at least one second convex portion interposed therebetween, so that the movable range of the base portion extending on both sides of the deformation guiding portion is provided. (I.e., the range in which the absorbent body is bent) is wide, and even after the absorbent body absorbs liquid excrement, between the first convex portion and the compressed region, and the second convex portion and the above Since each boundary part between the compressed areas can function as a folding base point, the absorber absorbs liquid excreta. In After also, the absorbent article by the plurality of bending base point is easily deformed in the predetermined shape.
Furthermore, since the 1st convex part and 2nd convex part whose fiber density is comparatively low (namely, soft) protrude at least on the skin side rather than the pressing part of a pressing area | region, a wearer's skin surface is It is possible to soften the feel when touching the surface sheet of the absorbent article, and the squeezed part of the hard squeezing area is hard to be sensed by the wearer of the absorbent article, and wears a good feel and wear feeling Can be provided. Further, even when the first convex portion and the second convex portion are crushed due to collision between the convex portions when the absorbent body is bent, body pressure applied from the wearer, or the like, the first convex portion and Since a 2nd convex-shaped part is crushed so that the pressing part located between these may be covered, the hardness of the said pressing part is hard to be sensed by a wearer.
Therefore, the absorbent article of the present aspect 1 is easily deformed into a predetermined shape before and after absorption of excrement, and can absorb and retain excretion efficiently, and has a good touch and feeling of wear. Can be provided to the wearer.

  Moreover, in another aspect (aspect 2) of the present invention, in the absorbent article according to aspect 1, the predetermined direction is the length direction, and the absorber extends in the length direction of the absorber. The deformation guide portions are respectively provided at positions spaced apart from each other with the direction center axis therebetween.

The absorbent article according to this aspect 2 includes the deformation induction portions at positions where the absorber is spaced apart from each other across the widthwise central axis extending in the length direction of the absorber. The absorbent article is likely to be deformed into a substantially box-like shape that protrudes toward the non-skin surface side with the region sandwiched between the bottoms. As a result, the absorbent article of the present aspect 2 is configured such that when force is applied to the absorbent body by the wearer's buttocks or the like, the edge portions in the length direction and the width direction of the absorbent article are aligned with the skin surface of the wearer. In the center region of the absorbent article (that is, the region straddling both the width direction central axis C _L and the length direction central axis C _W of the absorbent article), between the skin surface of the wearer and the top sheet In addition, since it can be deformed into a substantially box shape so as to secure a certain space (hereinafter, sometimes simply referred to as “excrement storage space”), solid excrement is added to the excrement storage space. Liquid excrement can be absorbed in the absorbent body while being retained, and excrement can be absorbed and retained more efficiently.

  Furthermore, in another aspect (aspect 3) of the present invention, in the absorbent article according to aspect 2, the absorbent body has a length direction, a width direction, and a thickness direction and includes at least the water-absorbing fiber. And a core wrap that covers the outer peripheral surface of the absorbent core, and the absorbent core is a pair of notches provided at symmetrical positions across the central axis in the width direction at both ends in the width direction. A plurality of bending guide lines connecting the portions closest to the central axis in the width direction are arranged in parallel in the length direction, and the deformation guide section includes at least a plurality of the bending guide lines. From the bending guide line closest to one end in the length direction of the absorption core to the bending guide line closest to the other end in the length direction of the absorption core of the plurality of bending guide lines It extends over.

  The absorbent article according to aspect 3 is easily bent in the length direction by the plurality of bending guide lines arranged in parallel in the length direction of the absorption core, and the width of the absorption core is increased. A pair of notches provided at both ends prevent the absorber from interfering with each other when the absorber is deformed and three-dimensionalized along the deformation guide portion and the bending guide line. Therefore, the absorbent body is easily deformed with high accuracy by the above-mentioned substantially box-shaped shape, and the above-mentioned excrement accommodation space can be secured more reliably. As a result, the absorbent article of aspect 3 can absorb and hold excreta discharged from the wearer more efficiently.

  Furthermore, in another aspect (aspect 4) of the present invention, in the absorbent article according to aspect 2 or 3, the deformation guide portion is convex outward with respect to the central axis in the width direction in plan view. Includes patterns.

  The absorbent article according to aspect 4 includes a pattern in which each of the deformation guide portions protrudes outwardly with respect to the central axis in the width direction in plan view. Can be secured widely, and when the absorbent article is deformed into a substantially box shape that is convex on the non-skin surface side, the absorbent article is likely to be deformed into a box shape with a wide bottom. In the central region, a large amount of excrement accommodation space can be secured between the skin surface of the wearer and the top sheet, and excrement can be absorbed and retained more efficiently.

  Furthermore, in another aspect (aspect 5) of the present invention, in the absorbent article according to any one of aspects 1 to 4, the total width of the squeezing regions in the deformation induction part is 1 of the width of the deformation induction part. / 2 or less.

In the absorbent article according to this aspect 5, the total width of the compression regions in the deformation induction portion is ½ or less of the width of the deformation induction portion, and the width of each compression region is narrow. The pressing part of the hard pressing region is less likely to be sensed by the wearer of the absorbent article, and a better feel and wearing feeling can be provided to the wearer. Further, even when the first convex portion and the second convex portion are crushed by collision between the convex portions when the absorbent body is bent, body pressure applied from the wearer, or the like, the first convex shape. Since the portion and the second convex portion can more completely cover the compressed portion located between them, the hardness of the compressed portion is further less likely to be sensed.
Moreover, when the said compression area | region is formed by pressing together a surface sheet and the said absorber, when the width | variety of the said compression area | region is formed narrowly as mentioned above, an absorbent article is a precise structure There is also an advantage that it is possible to give a sense of security to the wearer and the like by giving an aesthetic appearance that gives such an impression.

  Furthermore, in another aspect (aspect 6) of the present invention, in the absorbent article according to any one of aspects 1 to 5, the pressing area includes a plurality of pressing portions provided intermittently along the predetermined direction, and A non-squeezing part that exists between the pressing parts adjacent to each other in the predetermined direction, and the non-squeezing part protrudes to the skin side from the pressing part.

  In the absorbent article according to this aspect 6, since the non-compressed portion existing between the compressed portions adjacent to each other in the predetermined direction protrudes toward the skin surface side than the compressed portion, the skin surface of the wearer is in the predetermined direction. Even when sliding on the surface sheet along, the hardness of the squeezed portion is hardly sensed, and a good touch and a feeling of wearing can be provided to the wearer more reliably.

  Furthermore, in another aspect (aspect 7) of the present invention, in the absorbent article according to any one of the aspects 1 to 6, the absorbent body includes an absorbent polymer, and the absorbent polymer is included in the deformation induction portion. Is smaller than the basis weight of the absorbent polymer contained in the base.

  In the absorbent article according to this aspect 7, since the absorbent body includes the absorbent polymer, it is possible to steadily absorb and retain excrement (particularly liquid excrement). Moreover, since the basis weight of the absorbent polymer is small, the deformation induction part of the absorbent body is difficult to expand even after the absorbent body absorbs liquid excrement, and the compressed part also disappears. Therefore, the absorbent article can be maintained in a state where it is easily deformed into a predetermined shape. As a result, the absorbent article according to the present aspect 7 can absorb and retain excretion more efficiently even after absorption of the liquid excrement while improving the absorbability of the absorbent with respect to the liquid excretion.

  Furthermore, in another aspect (aspect 8) of the present invention, in the absorbent article according to any one of aspects 1 to 7, the base portion is adjacent to the first convex portion and along the first convex portion. Provided on the non-skin surface side, and a base body adjacent to the recess.

Since the absorbent article of this aspect 8 is provided with a concave portion adjacent to the first convex portion, it is between the first convex portion and the concave portion, and between the concave portion and the base main body. A large fiber density difference (that is, a large rigidity difference occurs) occurs in each boundary portion of each, and each boundary portion can also function as a folding base point of the absorbent body. Therefore, the absorbent article can be further easily deformed into a predetermined shape. can do.
In addition, when the concave portion is provided adjacent to the first convex portion, the protrusion of the first convex portion is more conspicuous, so that the softness due to the first convex portion is more easily felt and absorbable. As a product, it is possible to provide the wearer with a better feel and wearing feeling.

  Furthermore, in another aspect (aspect 9) of the present invention, in the absorbent article according to aspect 8, the absorbent body contains an absorbent polymer and extends in the thickness direction on the non-skin surface side of the recess. The mass content of the absorbent polymer contained in the portion is larger than the mass content of the absorbent polymer contained in the base body.

  In the absorbent article according to this aspect 9, the absorbent body contains an absorbent polymer, and the mass content of the absorbent polymer contained in the portion extending in the thickness direction on the non-skin surface side of the concave portion is Since the basis weight of the absorbent polymer contained in the base body is higher, the first convex shape has a relatively low fiber density (that is, a relatively low absorbency) due to the absorbent polymer. Even after the absorber absorbs the liquid excrement, the swelling of the absorber in the vicinity of the first convex portion is depressed on the non-skin surface side, while ensuring the absorbability in the vicinity of the portion). The effect produced by the first convex portion described above can be continuously exhibited.

  Furthermore, in another aspect (aspect 10) of the present invention, in the absorbent article according to any one of aspects 1 to 9, the thickness of the second convex portion is smaller than the average thickness of the base portion.

  In the absorbent article of this aspect 10, since the thickness of the second convex portion existing in the central region in the width direction of the deformation induction portion is small, the absorbent body is bent with the above-described boundary portions as the folding base points. The first convex portion and the second convex portion are unlikely to interfere (collision), and the absorbent article can be more reliably deformed into the predetermined shape.

  Furthermore, in another aspect (Aspect 11) of the present invention, in the absorbent article according to any one of Aspects 1 to 10, the width of the second convex part is narrower than the width of the first convex part.

  In the absorbent article according to this aspect 11, since the width of the second convex portion existing in the central region in the width direction of the deformation induction portion is narrow, the absorbent body is bent with the above-described boundary portions as the folding base points. The first convex portion and the second convex portion are unlikely to interfere (collision), and the absorbent article can be more reliably deformed into a predetermined shape.

  Furthermore, in another aspect (aspect 12) of the present invention, in the absorbent article according to any one of aspects 1 to 11, the deformation guide part is the second convex part between the two first convex parts. 2 or more, and between the said 2nd convex-shaped parts, the subcompression area | region which has the pressing part which extended in the said predetermined direction and consolidated the said absorber in the said thickness direction is provided.

  The absorbent article according to this aspect 12 includes two or more second convex portions between the two first convex portions, and the second convex portions are arranged in the predetermined direction between the second convex portions. Since it has a sub-squeezing region that extends and compresses the absorbent body in the thickness direction, there are many boundary portions having a rigidity difference that can function as a folding base point of the absorbent body. In addition to ensuring a wider range of bending, the absorbent body can be easily bent even after absorption of liquid excreta.

  Furthermore, in another aspect (aspect 13) of the present invention, in the absorbent article according to any one of aspects 1 to 12, the absorbent body extends in the predetermined direction, and at least in the predetermined direction of the deformation guide portion. An end-side deformation inducing portion connected to one end, the end-side deformation inducing portion extending in the predetermined direction and projecting from the base portion toward the skin surface side; An end-side squeezing region having a squeezing portion that extends in the predetermined direction between the one convex portion and the two end-side first convex portions and that compacts the absorber in the thickness direction; The fiber density of the end side first convex part is lower than the fiber density of the base part, and the end part side squeezing area of the absorbent article in the squeezing area of the deformation induction part It connects with the end of the pressing area located in an inner side by planar view.

  The absorbent article of this aspect 13 is connected to one end of a compressed area where the end-side compressed area is located on the inner side in a plan view of the absorbent article in the compressed area of the deformation induction section. And since there exist two end part side 1st convex parts which protrude from the said base part to the skin surface side in the both sides of the said end part side pressing area | region, the area | region (namely, absorption) where the said end part side deformation induction part exists Even in the region of the end in the predetermined direction of the body, the end-side squeezing region while holding the function of inducing the absorbent article (hereinafter sometimes simply referred to as “deformation inducing function”). The squeezed portion can be made hard to be sensed by the wearer, and the wearer can be provided with a better touch and feel. In addition, since the said edge part side pressing area | region is connected with the end of the pressing area | region located in an inner side in the planar view of the said absorbent article among the pressing area | regions of the said deformation | transformation induction | guidance | derivation part (that is, the said Since the end-side compressed region is provided at a position away from the edge in the width direction of the absorbent body), the end-side compressed region of the hard end-side compressed region is harder than the wearer's buttocks, etc. The touch is difficult to be transmitted and the above-mentioned good touch and wearing feeling can be maintained.

  Furthermore, in another aspect (aspect 14) of the present invention, in the absorbent article according to any one of the aspects 1 to 13, the deformation guide portion is the two first convex shapes on the non-skin surface side of the absorber. Two third convex portions projecting from the base to the non-skin surface corresponding to the portion, and at least one fourth convex projecting to the non-skin surface corresponding to the at least one second convex portion A non-skin-side pressing area having a non-skin-side pressing part corresponding to the pressing part on the skin side between the third protruding part and the fourth protruding part. The fiber density of each of the third convex portion and the fourth convex portion is lower than the fiber density of the base portion.

  Since the absorbent article of this aspect 14 is provided with each convex-shaped part with low fiber density (namely, soft) and each pressing area on the non-skin surface side, the absorbent body is on the non-skin surface side. Further, the absorbent article can be easily bent (that is, the degree of freedom of deformation of the absorbent body is high), and the absorbent article can be more easily deformed according to the body shape and movement of the wearer. As a result, it is possible to further improve the leak-proof property and wearing feeling of the absorbent article.

  According to the present invention, an absorbent article that is easily deformed into a predetermined shape before and after absorption of excrement, can efficiently absorb and retain excrement, and is excellent in touch and wearing feeling. Can be provided.

Drawing 1 is a top view in the state where the disposable diaper 1 concerning one embodiment of the present invention was developed. FIG. 2 is a perspective view when the disposable diaper 1 according to the embodiment of the present invention is deformed into a predetermined shape. FIG. 3 is a plan view of the absorbent body 4 of the disposable diaper 1 according to the embodiment of the present invention. FIG. 4 is an enlarged end view of a main part along IV-IV ′ of the absorber 4 shown in FIG. 3. Fig.5 (a) is a schematic diagram which shows the state after the absorber 4 shown in FIG. 4 absorbed the liquid excrement, FIG.5 (b) is the absorber 4 of the state shown to Fig.5 (a). It is a schematic diagram which shows the state bent by the width direction. Fig.6 (a)-(c) is an end elevation equivalent to FIG. 4 of the absorber of the absorbent article which concerns on another embodiment of this invention, respectively. FIG. 7 is a plan view of an absorbent body 4d of an absorbent article according to still another embodiment of the present invention. Drawing 8 is a mimetic diagram for explaining an example of the manufacture device of absorber 4 of disposable diaper 1 concerning one embodiment of the present invention. FIG. 9A is an enlarged schematic view of the main part when the portion X in FIG. 8 is viewed from the MD direction, and FIG. 9B is a schematic view of the first laminated in the mold member provided on the outer peripheral surface of the suction drum. It is a principal part expanded end elevation which shows typically a state of the laminated body of 1 from MD direction. FIG. 10A is an enlarged end view of the main part of the end surface corresponding to FIG. 4 of the second laminated body before being compressed by the press device in the manufacturing process of the absorbent body 4, and FIG. FIG. 10C is an enlarged end view of the main part of the end surface corresponding to FIG. 4 of the third laminated body when compressed by the press device (before bulk recovery) in the manufacturing process of the body 4. It is a principal part expanded end elevation of the end surface equivalent to FIG. 4 of the 3rd laminated body after bulk recovery after compression with a press apparatus in a manufacturing process (before a pressing process). FIG. 11: is a schematic diagram for demonstrating an example of the manufacturing apparatus of the absorber 4a of the absorbent article which concerns on another embodiment (embodiment in which an absorber does not contain an absorptive polymer) of this invention. FIG. 12 is an enlarged schematic view of a main part when the shaping device in the manufacturing apparatus shown in FIG. 11 is viewed from the MD direction. FIG. 13A is an enlarged end view of the main part of the end surface corresponding to FIG. 4 of the second laminated body before shaping by the shaping apparatus in the manufacturing process of the absorbent body 4a, and FIG. FIG. 5 is an enlarged end view of the main part of the end surface corresponding to FIG. 4 of the third laminated body after shaping by the shaping device (before the pressing step) in the manufacturing process of the absorbent body 4a.

Hereinafter, preferred embodiments of the absorbent article of the present invention will be described in detail with reference to the drawings. In the present specification, unless otherwise specified, “the thickness of the target object (for example, an absorbent article, an absorbent body, etc.) placed on a horizontal surface in an unfolded state from the upper side in the vertical direction is described. “Looking in the direction” is simply called “plan view”.
In this specification, “width direction W” refers to “a direction in which the length of a vertically long object is short (short direction)” in plan view, and “length direction L” is “portrait in plan view” "Long direction (longitudinal direction)" of the object of the "thickness direction", "thickness direction T" is the vertical direction (that is, the thickness direction of the object) with respect to when placed on the horizontal plane in the unfolded state The width direction W, the length direction L, and the thickness direction T are orthogonal to each other.
Further, in this specification, "vertically elongated object (e.g., an absorbent article, the absorbent body, etc.) in the width direction W of the relatively proximal side with respect to the width direction central axis C _L extending in the longitudinal direction L "I refer to the" inner side in the width direction ", in the width direction W of the object of" the vertical, outer side relatively distal "and in the" width direction with respect to the widthwise central axis C _L " Similarly, “in the longitudinal direction L of the vertically long object, the relatively proximal side relative to the longitudinal central axis C _W extending in the width direction W” is referred to as “inward side in the longitudinal direction”. , “In the longitudinal direction L of the longitudinal object, the distal side relative to the longitudinal central axis _CW ” is referred to as “the outward side in the longitudinal direction”.
Further, in this specification, in the thickness direction T of the absorbent article, “relatively proximal to the wearer's skin surface when the absorbent article is worn” is referred to as “skin surface side”. The “relatively distal side relative to the skin surface of the wearer when wearing the property article” is referred to as “non-skin surface side”.

FIG. 1 is a plan view of a state in which a disposable diaper 1 according to an embodiment of the present invention is developed, and FIG. 2 is a perspective view when the disposable diaper 1 is deformed into a predetermined shape.
As shown in FIG. 1, the disposable diaper 1 according to one embodiment of the present invention has a shape whose outer shape is long in the length direction L in plan view, and further, a substantially central portion in the length direction L. Has an approximately hourglass shape narrowed toward the inner side in the width direction W. In the present invention, the outer shape of the absorbent article is not limited to such an outer shape, and if the length dimension in the length direction L is longer than the width dimension in the width direction W, An arbitrary vertically long shape (for example, a rectangle, an ellipse, a bowl, etc.) can be used according to various applications.

  The disposable diaper 1 according to the present embodiment has a length direction L, a width direction W, and a thickness direction T as shown in FIGS. 1 and 2, and a liquid-permeable surface in the thickness direction T. A sheet 2, a liquid-impermeable back sheet 3, and an absorber 4 disposed between these sheets are provided. Further, the disposable diaper 1 includes hydrophobic or water-repellent side sheets 5 and 5 that are disposed on the skin surface side of the top sheet 2 to form a pair of leak-proof walls, and the pair of leak-proof walls. And an elastic member 6 extending in the length direction L on the front end side in the width direction W. In addition, in the disposable diaper 1 shown in FIG. 1, the one end side of the length direction L located below FIG. 1 is the abdomen side which covers a wearer's abdomen, and the other end side of the length direction L located above is a wearer's abdomen. It is the dorsal side which covers a back part (buttock). Moreover, the disposable diaper 1 which concerns on this embodiment is what is called a tape-type disposable diaper with which a wearer is mounted | worn using the tape fastener 7 at the time of wear.

In the present embodiment, the top sheet 2 is disposed on the skin surface side of the absorbent body 4, and liquid excretion such as urine from the wearer is quickly absorbed or permeated to move toward the absorbent body 4. It is a permeable sheet-like member. In addition, in this embodiment, the said surface sheet 2 is long formed in the direction in alignment with the length direction L of the disposable diaper 1. FIG.
Further, in the present invention, as the surface sheet, for example, any liquid permeable sheet such as a nonwoven fabric, a woven fabric, a synthetic resin film in which liquid permeable holes are formed, and a net-like sheet having a mesh can be used. Among these, it is preferable to use a nonwoven fabric from the viewpoints of liquid permeability, flexibility, and touch.

In the present embodiment, the back sheet 3 is disposed on the non-skin surface side of the disposable diaper 1 and prevents liquid excretion discharged from the wearer from leaking out of the disposable diaper 1. Sheet-like member. The back sheet 3 is bonded to each other with the top sheet 2 and the side sheets 5 and 5 and the absorber 4 sandwiched therebetween. For this bonding, for example, any bonding means such as bonding with a hot melt adhesive or bonding by various embossing treatments can be used.
In the present invention, the back sheet is, for example, a waterproof nonwoven fabric, a synthetic resin film such as polyethylene or polypropylene, a composite sheet of a nonwoven fabric and a synthetic resin film, or any liquid impermeable sheet such as an SMS nonwoven fabric. Can be used.

FIG. 3 is a plan view of the absorbent body 4 of the disposable diaper 1 according to the present embodiment, and FIG. 4 is an enlarged end view of a main part along IV-IV ′ of the absorbent body 4 shown in FIG. 3. In addition, the code | symbols 81-83 and 91-93 in FIG. 3 represent the ridgeline of the top part in each convex-shaped part, and the broken line of the code | symbol 11 represents the width direction centerline of the bottom part in a recessed part.
In the present embodiment, the absorbent body 4 is an absorbent member that is disposed between the top sheet 2 and the back sheet 3 and absorbs and holds liquid excretion that has permeated through the top sheet 2. In addition, in this embodiment, as shown in FIG.1 and FIG.3, the absorber 4 has a substantially rectangular external shape in planar view, As a whole, it is near the stomach side of the disposable diaper 1. They are arranged in a biased manner.

  In the present embodiment, as shown in FIG. 4, the absorbent body 4 includes an absorbent core 41 made of an absorbent material including water absorbent fibers 41 </ b> F and absorbent polymer 41 </ b> S for absorbing and holding liquid excrement, and the absorbent core. And a core wrap 42 made of at least one liquid-permeable sheet that covers the outer peripheral surface of 41. In the present invention, the water-absorbing fiber is not particularly limited as long as it can absorb and retain a liquid, and for example, a cellulose-based water-absorbing fiber such as pulp can be used. The core wrap is not particularly limited as long as it has liquid permeability and can maintain the shape of the absorbent body. For example, a liquid permeable sheet such as a tissue can be used. Furthermore, an absorptive polymer will not be restrict | limited especially if a liquid can be absorbed and hold | maintained, For example, a highly water-absorbing polymer of a starch type, a cellulose type, and a synthetic polymer type can be used. In addition, in this embodiment, although the absorption core 41 which comprises the absorber 4 contains the water absorbing fiber 41F and the absorbent polymer 41S, in this invention, it is not limited to such an aspect, Absorber As long as the absorbent core contains water-absorbing fibers, the absorbent core may not contain the absorbent polymer.

  And as shown in FIG.3 and FIG.4, the absorber 4 functions the said absorber 4 so that the disposable diaper 1 may be deform | transformed into the predetermined shape predetermined beforehand (in this embodiment, in this embodiment). A pair of deformation guide portions 8 and 9 extending in a direction along the length direction L of the absorbent article, and base portions 10 disposed on both sides of the deformation guide portions 8 and 9 are provided.

As shown in FIGS. 3 and 4, one of the pair of deformation guide portions 8, 9 extends in the length direction L and protrudes from the base portion 10 to the skin surface side. Two first convex portions 81, 82 and one second convex portion 83 extending in the length direction L between the two first convex portions 81, 82 and projecting to the skin surface side. And a compression that extends in the longitudinal direction L between the two first convex portions 81 and 82 and the second convex portion 83 and that compacts the absorbent body 4 in the thickness direction T. Squeezing regions 84 and 85 including portions 84p and 85p, and the other deformation guiding portion 9 of the pair of deformation guiding portions 8 and 9 extends in the length direction L, and Between the two first convex portions 91 and 92 projecting from the base portion 10 to the skin surface side, and the two first convex portions 91 and 92 And extending in the length direction L and projecting to the skin surface side, and between the two first convex portions 91 and 92 and the second convex portion 93. Each includes compression regions 94 and 95 including compression portions 94p and 95p extending in the length direction L and compacting the absorbent body 4 in the thickness direction T.
Moreover, in this embodiment, a pair of deformation | transformation induction | guidance | derivation parts 8 and 9 and the base 10 in the absorber 4 are integrated by the core wrap 42 arrange | positioned at the outer peripheral surface of the absorption core 41 and this absorption core 41, as shown in FIG. Is formed.
In addition, as for the surface by the side of the non-skin surface of the absorber 4, as shown in FIG. 4, the part by the side of the non-skin surface of the pressing parts 84p, 85p, 94p, and 95p is dented in the skin surface side. This squeezes the absorbent body 4 (ie, the absorbent core 41 and the core wrap 42 covering the outer peripheral surface of the absorbent core 41) in the thickness direction T from the skin surface side to form the compressed portions 84p, 85p, 94p, and 95p. The tension applied to the core wrap 42 positioned around the compressed parts 84p, 85p, 94p, and 95p is released after the compression and the core wrap 42 contracts, and the compressed parts 84p, 85p, and 94p are contracted by the contraction , 95p is formed by being pulled up to the skin surface side. Thus, when the non-skin surface side portions of the compressed portions 84p, 85p, 94p, and 95p are recessed to the skin surface side, the surrounding portion has a structure that is relatively slightly swollen. Cushioning properties and flexibility as a body can be improved.

In the present invention, the basis weight of the base in the absorbent body (that is, the basis weight of the absorbent material excluding the core wrap (in this embodiment, the basis weight of the absorbent material composed of the water absorbent fibers 41F and the absorbent polymer 41S). )), although varied depending on the use or the like, preferably in the range of 100 to 1000 g / ^{m 2,} more preferably in the range of 200~900g / ^{m 2,} more preferably in the range of 300 to 800 g / ^{m 2} is there. When the basis weight of the base is 100 g / m ² or more, it is possible to sufficiently secure the absorption capacity of the base, which is a part that mainly absorbs and holds liquid excreta in the absorbent body. Moreover, a base becomes bulky and flexible as the basic weight of a base is 1000 g / m < ² > or less, and also the said base can bring a favorable touch and a feeling of wear.
On the other hand, the basis weight of the deformation induction portion in the absorbent body (that is, the basis weight of the absorbent material in the two first convex portions, the second convex portion, and the compressed region) is not particularly limited, but the basis weight of the above-described base portion. It is preferable that it is 30-80 mass% of quantity. When the basis weight of the deformation induction portion is 30% by mass or more of the basis weight of the base portion, the absorber is less likely to lose its shape in the deformation induction portion, and a certain absorption capacity or more can be secured. In addition, when the basis weight of the deformation induction portion is 80% by mass or less of the basis weight of the base, the deformation induction portion (particularly, the first convex portion and the second convex portion) becomes more bulky and flexible. In the deformation induction portion, it is possible to bring about a better feel and wearing feeling.

Hereinafter, the pair of deformation guide portions 8 and 9 of the absorbent body 4 in the disposable diaper 1 according to the present embodiment will be described in more detail. These deformation guide portions 8 and 9 have a widthwise central axis extending in the length direction L. It provided in positions symmetrical with respect to C _L, due to the provision of the same configuration, in the following description, detailed only one deformation introducing portion 8 from the viewpoint of simplification of the description.

In the present embodiment, the two first convex portions 81 and 82 and the one second convex portion 83 of the deformation guiding portion 8 are portions that protrude to the skin surface side from the base portion 10, and both are substantially the same. It has a protruding height (that is, a distance between the apex of the convex portion and the non-skin-side surface of the base portion). Since these convex-shaped parts 81-83 protrude in the skin surface side rather than the pressing parts 84p and 85p in at least a pair of pressing area | regions 84 and 85, the skin surface of the wearer of an absorbent article is the skin of the surface sheet 2 When the surface-side surface is contacted, the hard pressed portions 84p and 85p are not easily sensed by the wearer through the surface sheet 2, and a good touch and wearing feeling can be provided to the wearer. . Furthermore, since these convex-shaped parts 81-83 are each provided in the both sides of the said pair of pressing area | regions 84 and 85 extended in the length direction L, how a wearer's skin surface is on top sheet 2 Even if it slides, since at least one convex-shaped part 81-83 contacts a wearer's skin surface indirectly through the surface sheet 2, the hard pressing parts 84p and 85p are the said surface sheets. The wearer is less likely to be impressed through 2. Thereby, even when the wearer is moving, it is possible to continue to provide the wearer with a good feel and wearing feeling.
Further, as shown in FIG. 4, the first convex portions 81 and 82 and the second convex portion 83 in the present embodiment are formed such that the top side portion of the convex portion has a substantially semicircular cross section. Since the surface of the wearer can be softly contacted through the top sheet 2 with a small contact area, the wearer is unlikely to feel uncomfortable due to the convex portions 81 to 83 described above.
In addition, in this embodiment, the surface sheet 2 is arrange | positioned at the skin surface side of each above-mentioned convex-shaped part 81-83, and the surface sheet 2 and the absorber 4 are the pressing parts 84p of the said deformation | transformation induction | guidance | derivation part 8, Although it is not squeezed integrally at 85p (that is, the topsheet 2 and the absorber 4 are not joined by the squeezed portions 84p, 85p), in the present invention, the topsheet and the absorber are deformed. The squeezing part may be squeezed integrally. Even in such a case, since the pair of first convex portions and the at least one second convex portion protrude at the skin surface side from at least the pressing portion, the skin surface of the wearer is the skin surface of the topsheet. When contacting the surface on the side, the hard pressed portion is hard to be sensed by the wearer, and a good touch and wearing feeling can be provided to the wearer.

In the present embodiment, the first convex portions 81 and 82 and the second convex portion 83 are configured such that the fiber density is lower than the fiber density of the base portion 10. Therefore, between the base 10 and each 1st convex part 81,82, between each 1st convex part 81,82 and each pressing area | region 84,85, and the 2nd convex part 83 and each pressing area | region 84. , 85 can be easily bent toward the skin surface due to a difference in rigidity caused by a difference in fiber density of the absorbent body 4, and can function as a folding base point of the absorbent body 4, respectively. Thus, the disposable diaper 1 can be easily deformed into a predetermined shape as shown in FIG. In that case, since each said convex-shaped part 81-83 has a comparatively low fiber density (namely, soft) and can be crushed even if it collides with each other, there is no possibility of inhibiting the bending of the absorber 4.
Therefore, the disposable diaper 1 which concerns on this embodiment will deform | transform according to a wearer's body shape and a movement, if a pressure (especially the pressure of the width direction W) is added to the absorber 4 by a wearer's buttocks etc. FIG. Therefore, the excrement can be efficiently absorbed and retained, and further, discomfort caused by the excrement adhering to the skin surface of the wearer can be reduced.
In addition, the first convex portions 81 and 82 and the second convex portions 83 having relatively low fiber density (ie, softer) are skin than the compressed portions 84p and 85p of at least the compressed regions 84 and 85 as described above. Since it protrudes in the surface side, while the wearer's skin surface can touch the surface of the surface sheet 2 of the disposable diaper 1, it can soften the touch, and the compression parts 84p and 85p with relatively hard hardness are provided. It is difficult for the wearer to sense through the surface sheet 2, and a good touch and wearing feeling can be provided to the wearer. Further, even when the first convex portions 81 and 82 and the second convex portion 83 are crushed by collision between the convex portions when the absorbent body 4 is bent, body pressure applied from the wearer, or the like, the first Since the first convex portions 81 and 82 and the second convex portion 83 are crushed so as to cover the compressed portions 84p and 85p located between them, the hardness of the compressed portions 84p and 85p is impressed by the wearer. It is hard to be done.

In the present invention, the fiber density of the first convex part and the second convex part is not particularly limited as long as it is lower than the fiber density of the base part, but it is within the range of 0.20 to 0.80 times the fiber density of the base part. More preferably, it is in the range of 0.25 to 0.75 times, more preferably in the range of 0.30 to 0.70 times. When the fiber density of the first convex part and the second convex part is 0.20 times or more of the fiber density of the base part, each convex part has excellent cushioning properties and flexibility. On the other hand, when the fiber density of the first convex part and the second convex part is 0.80 times or less of the fiber density of the base part, when the absorbent body is bent, the impact of the absorbent body due to the collision between the convex parts. Bending is further prevented from being hindered, and the deformation induction function of the deformation induction portion can be sufficiently exhibited.
In addition, as long as the fiber density of a 1st convex part and a 2nd convex part is lower than the fiber density of a base, it may respectively be the same, and may differ, respectively.
Further, in this specification, the fiber density is not particularly limited as long as the fiber density of the first convex portion and the second convex portion and the fiber density of the base portion can be relatively compared. Each fiber density can be measured in accordance with the following [Fiber density measuring method].
[Fiber density measurement method]
(1) Take out the absorber from the absorbent article (if the absorber and other member (surface sheet or the like are joined), together with other members), and remove 20 mm from the absorber to include the location to be measured. A sample for measurement having a size of 20 mm is cut out.
(2) 3D measurement X-ray CT apparatus (TDM-1000-IS / SP, manufactured by Yamato Scientific Co., Ltd.) equipped with image processing software (3D volume rendering software: VG-Studio MAX manufactured by Nippon Visual Science Co., Ltd.) , The measurement sample is subjected to predetermined imaging conditions (tube voltage: 30 kv, tube current: 30 μA, number of pixels: 1024 pixels × 1024 pixels, field size: maximum within a range in which the measurement sample can be accommodated in the thickness direction. By taking tomography at a magnification, image data of the internal cross section (XY cross section, YZ cross section, and XZ cross section) of the measurement sample is obtained in the bmp format.
(3) The obtained image data is transferred to an image analysis software (USB digital scale manufactured by SCARA Co., Ltd.) for image analysis, and the thickness at the measurement target portion (that is, the convex portion or the base portion) of the measurement sample. (Mm) is measured. At this time, the thickness of the said measurement object site | part measures the thickness of only the absorber except other members, such as a surface sheet.
(4) Cut out only the measurement target part whose thickness was measured from the measurement sample to obtain a measurement target part piece. At this time, when the measurement sample includes another member such as a surface sheet, the small member is obtained by removing the other member.
(5) The area (bottom area) (mm ² ) on the non-skin surface side of the obtained measurement target part piece is measured.
(6) The mass (g) of the small piece is measured using an electronic balance (GR-300 manufactured by A & D Co., Ltd., accuracy: 4 digits after the decimal point).
(7) After integrating the thickness (mm) of the measurement target part and the area (mm ² ) on the non-skin surface side of the small piece, the apparent volume (cm ³ ) is calculated.
(8) When the absorbent core in the absorbent body does not contain an absorbent polymer (that is, when the absorbent core consists only of water-absorbing fibers), the mass (g) of the small piece is expressed as an apparent volume (cm By dividing by ³ ), the fiber density (g / cm ³ ) of the site to be measured is obtained.
Moreover, when the said absorption core contains an absorptive polymer, the following steps (9)-(12) are performed sequentially after the step (7).
(9) The mass content (%) of the absorbent polymer contained in the above-mentioned measurement target site piece is determined according to [Method for measuring mass content of absorbent polymer] described later.
(10) The mass (g) of the absorbent polymer contained in the small piece is calculated from the mass (g) of the small piece and the mass content (%) of the absorbent polymer.
(11) By subtracting the mass (g) of the absorbent polymer from the mass (g) of the small piece, the mass (g) of the water-absorbing fibers contained in the small piece is obtained.
(12) The fiber density (g / cm ³ ) of the measurement target part is obtained by dividing the mass (g) of the obtained water-absorbing fiber by the apparent volume (cm ³ ) of the measurement target part.
In addition, a fiber density is measured in arbitrary 5 places in the same measurement object site | part, and the average value is employ | adopted. Further, if only comparing the fiber density, it is possible to visually confirm the image data obtained in the above step (2).

Further, in the present invention, the protruding height of the first convex portion and the second convex portion (here, the protruding height of the convex portion means the thickness of the convex portion, specifically, The distance between the apex of the convex portion and the surface on the non-skin surface side) is 1 of the thickness of the base (however, if the base has a recess, the thickness of the base body other than the recess). It is preferably 2 to 3.0 times, more preferably 1.3 to 2.5 times, and even more preferably 1.5 to 2.0 times. When the protrusion height of the first convex portion and the second convex portion is 1.2 times or more of the thickness of the base portion, these convex portions collide with each other when the absorber is bent. Even in the case of being crushed by body pressure applied from the wearer, etc., it can be crushed so as to cover the squeezed part positioned between these convex parts more reliably, so that the hardness of the squeezed part is more sensitive to the wearer. It becomes difficult to be taken. On the other hand, when the protrusion height of the first convex portion and the second convex portion is 3.0 times or less of the thickness of the base portion, when the absorber is bent, the collision of each convex portion causes the absorber to bend. Bending is further prevented from being hindered, and the deformation induction function of the deformation induction portion can be sufficiently exhibited. Furthermore, when the absorbent article is folded and packed as a package, the absorbent article can be neatly folded, so that when the absorbent article is worn, the wearer feels uncomfortable due to creases, etc. There is also an advantage that is difficult to occur.
In addition, the protrusion height of a 1st convex-shaped part and a 2nd convex-shaped part is not restrict | limited especially unless the effect of this invention is inhibited, Each may be the same, or may each differ.
Here, the thickness of the base (however, when the base has a recess, the thickness of the base body other than the recess) is any point on the skin side surface of the base and the non-base (base body) It means the distance between the skin surface side and (1) in the above-mentioned [Fiber Density Measurement Method] as well as the protruding height of the convex portion (that is, the thickness of the convex portion). Measurement can be performed by sequentially performing steps (3) to (3). In addition, the thickness of the said convex-shaped part and the said base is measured at arbitrary 5 places, respectively, and the average value is each employ | adopted as a measured value of thickness.
Note that such a thickness measuring method is applied not only to the above-described protrusion height of each convex portion and the thickness of the base (base body), but also to the thickness of other parts of the absorber. be able to.

In the present embodiment, the compression regions 84 and 85 of the deformation guiding portion 8 apply pressure to the absorbent body 4, that is, the absorbent core 41 and the core wrap 42 covering the outer peripheral surface of the absorbent core 41, such as embossing. The first convex part 81 and the second convex part 83 include one of the compressed parts 84p and 85p formed by pressing in the thickness direction T from the skin surface side of the absorbent body 4 using means. , And between the other first convex portion 82 and the second convex portion, respectively, one squeezing region 84, 85 is disposed (that is, the deformation guide portion 8 has two The compression regions 84 and 85 are disposed), and the compression regions 84 and 85 are formed along the first convex portions 81 and 82 and the second convex portions 83, respectively.
And since these pressing area | regions 84 and 85 are spaced apart and the 2nd convex-shaped part 83 is pinched | interposed, when the absorber 4 bends, it extends to the both sides of the said deformation | transformation induction | guidance | derivation part 8. The movable range of the base 10 (that is, the range in which the absorbent body 4 bends) is wide, and even after the absorbent body 4 absorbs the liquid excrement of the wearer, the first convex portions 81 and 82 and the compressed region 84 , 85, and each boundary portion between the second convex portion 83 and the compressed regions 84, 85 can function as a folding base point of the absorbent body 4, respectively. 4 and eventually the disposable diaper 1 is easily deformed into a predetermined shape.

Here, the reason why the absorbent body 4 of the disposable diaper 1 according to the present embodiment is easily deformed into a predetermined shape even after absorbing the liquid excrement of the wearer will be described in more detail with reference to the drawings. Fig.5 (a) is a schematic diagram which shows the state after the absorber 4 shown in FIG. 4 absorbed the liquid excrement, FIG.5 (b) is the absorber 4 of the state shown to Fig.5 (a). It is a schematic diagram which shows the state by which it was bent in the width direction (namely, toward the skin surface side).
As shown in FIG. 5A, when the absorbent body 4 absorbs the liquid excrement of the wearer, the absorbent material forming the absorbent core 41 (that is, the water absorbent fiber 41F and the absorbent polymer 41S) is liquid excreted. In order to absorb and hold objects, the volume expands as a whole, but in the deformation induction part 8 of the absorbent body 4, the fiber density of the water absorbent fibers 41F and the basis weight of the absorbent polymer 41S are smaller than those of the base part 10. Moreover, since the compressed parts 84p and 85p that hardly expand even when liquid excreta is absorbed are provided, the expansion of the volume can be suppressed within a certain range as compared with the base 10. Thereby, even after absorbing the liquid excrement, the absorbent body 4 includes at least the second convex portion 83 and the second convex portion 83 in the deformation guiding portion 8 as shown in FIG. Since it can hold | maintain the compression area | regions 84 and 85 provided mutually on both sides, between the 1st convex part 81 and the compression area | region 84, the compression area | region 84 and the 2nd convex part 83, Since each boundary part between the 2nd convex-shaped part 83 and the pressing area | region 85 and between the pressing area | region 85 and the 1st convex-shaped part 82 can each function as a bending | flexion origin, the absorber 4 is Even after liquid excretion is absorbed, it is easy to deform into a predetermined shape as shown in FIG.
Further, even after the absorbent 4 absorbs the liquid excrement, the first convex portions 81 and 82 and the second convex portion 83 having relatively low fiber density (that is, soft) are at least the compressed region 84. Since the state which protruded to the skin surface side from 85 pressing parts 84p and 85p is hold | maintained, while a wearer's skin surface can touch the surface of the surface sheet 2, it can soften the touch. The hard pressed parts 84p and 85p are not easily perceived by the wearer, and can continue to provide the wearer with a good touch and feel.

Moreover, the compression area | regions 84 and 85 in this embodiment are the predetermined direction, ie, the some compression parts 84p and 85p provided intermittently along the length direction of the deformation | transformation induction | guidance | derivation part 8, as shown in FIG. And a plurality of non-compressed non-compressed portions 84q and 85q that exist between the compressed portions 84p and 85p adjacent in the length direction. The pressing parts 84p and 85p are parts that are compacted by compressing the absorbent body 4 (that is, the absorbent core 41 and the core wrap 42 covering the outer peripheral surface of the absorbent core 41) in the thickness direction T from the skin surface side. And the bottom of the depression in which the surface of the absorber 4 is depressed in the thickness direction (here, “the bottom of the depression” is a portion extending from the bottom of the depression to the surface on the non-skin surface side in the thickness direction T). And the portion having the smallest thickness and the highest fiber density in the absorbent body 4. Therefore, the compressed parts 84p and 85p are the hardest parts in the absorber 4.
In addition, in this embodiment, the pressing parts 84p and 85p are formed by pressing together the absorption core 41 and the core wrap 42 which coat | covers the outer peripheral surface of this absorption core 41 from the skin surface side to the thickness direction T. However, in this invention, a pressing part is not limited to such an aspect, For example, pressing a surface sheet and the absorber which consists of an absorption core and a core wrap from the skin surface side to the thickness direction T together. Furthermore, the pressing part may be formed by pressing in the thickness direction T from both the skin surface side and the non-skin surface side of the absorber. In addition, the pressing part formed by pressing together various members (a surface sheet, an absorption core, a core wrap, etc.) functions also as a junction part which joins the said various members mutually.
Moreover, in this embodiment, the non-pressing parts 84q and 85q protrude at the skin surface side more than the pressing parts 84p and 85p (in the absorber 4 shown in FIG. 4 from the base 10), and the pressing parts 84p. The fiber density is smaller than that of 85p and is the softest part in the compressed regions 84 and 85. Therefore, even when the wearer's skin surface slides on the surface of the topsheet 2 along the length direction, the soft non-pressed portions 84q and 85q come into contact before the hard pressed portions 84p and 85p. For this reason, the hardness of the compressed parts 84p and 85p is hardly sensed, and the softness of the non-compressed part and the feeling of wearing can be provided to the wearer more reliably.

Moreover, in this invention, it is preferable that the width | variety of each pressing area | region in a deformation | transformation induction | guidance | derivation part is that the sum total width is 1/2 or less of the width | variety of a deformation | transformation induction | guidance | derivation part, More preferably, it is 1/4 or less, More preferably, 1 / 8 or less. When the total width of the compression regions in the deformation induction portion is ½ or less of the width of the deformation induction portion, the compression portion of the hard compression region is less likely to be sensed by the wearer of the absorbent article. It is possible to provide the wearer with a better feel and a feeling of wearing. Furthermore, even when the first convex portion and the second convex portion are crushed due to collision between the convex portions when the absorbent body is bent, body pressure applied from the wearer, or the like, the first convex portion and Since the said 2nd convex part can cover the pressing part located between these more reliably, the hardness of the said pressing part becomes still hard to be sensed.
Moreover, when the said compression area | region is formed by pressing together a surface sheet and an absorber, when the width | variety of the said compression area | region is formed narrowly as mentioned above, an absorbent article is made into a surface sheet. When viewed from the side, there is also an advantage that the absorbent article has an aesthetic appearance that gives an impression that it is an elaborate structure and can give a sense of security to the wearer and the like.
In addition, about the minimum of the total width | variety of each pressing area | region in a deformation | transformation induction | guidance | derivation part, it is 1/100 or more of the width | variety of a deformation | transformation induction | guidance | derivation part, for example, Preferably it is 1/50 or more. Moreover, the same width may be sufficient as the width | variety of each pressing area | region, and a different width | variety may be sufficient as it.

Here, the width of the deformation induction part in the absorbent article of the present invention (however, if the absorbent article includes a plurality of deformation induction parts, the width of one deformation induction part) is not particularly limited as long as the effect of the present invention is not impaired. It is not restrict | limited, For example, it exists in the range of 3-45 mm, Preferably it exists in the range of 5-40 mm, More preferably, it exists in the range of 10-30 mm. When the width of the deformation guiding portion is 3 mm or more, the deformation guiding function of the deformation guiding portion can be exhibited more effectively, and when the width of the deformation guiding portion is 45 mm or less, the deformation guiding portion has. A soft touch, a touch, etc. can be exhibited more effectively.
In the present invention, the width of each pressing region (that is, the width of each pressing portion) is preferably in the range of 0.3 to 8 mm, more preferably, although it depends on the width and shape of the deformation induction portion. Is in the range of 0.4 to 6 mm, more preferably in the range of 0.5 to 4 mm. When the width of each pressing region is 0.3 mm or more, the bonding strength by pressing is high, the absorber is not easily deformed, and the deformation induction function of the above-described deformation induction part can be more effectively exhibited. it can. Moreover, since the width | variety of a pressing part is narrow as the width | variety of each pressing area | region is 8 mm or less, the hardness of the said pressing part becomes still hard to be perceived by a wearer's skin surface.

Furthermore, in this invention, the length (length of the direction in alignment with the length direction of a pressing area | region) of the one pressing part in the several pressing part provided intermittently is the length, shape, etc. of a deformation | transformation induction | guidance | derivation part. However, it is preferably in the range of 1 to 20 mm, more preferably in the range of 2 to 15 mm, and still more preferably in the range of 2.5 to 10 mm. When the length of one pressing part is 1 mm or more, the bonding strength by pressing increases, so that the absorber is not easily deformed and the deformation induction function of the above-described deformation induction part is more effectively exhibited. be able to. Moreover, since the length of one pressing part is short as the length of one pressing part is 20 mm or less, the hardness of the said pressing part becomes still hard to be perceived by a wearer's skin surface.
Moreover, the length between the compression parts adjacent to the said length direction (namely, the length between the opposing parts in the compression part adjacent to the said length direction, or the length of the direction along the length direction of a non-compression part. ) Depends on the length and shape of the deformation induction part, the length of the compressed part, etc., but is preferably in the range of 0.1 to 20 mm, more preferably in the range of 0.5 to 15 mm, still more preferably. It is in the range of 1.0 to 10 mm. When the length between the pressing parts adjacent in the length direction is 0.1 mm or more, the length between the pressing parts adjacent in the length direction (that is, the length in the direction along the length direction of the non-squeezing part) Therefore, the non-compressed portion present between the compressed portions makes it difficult for the wearer's skin surface to sense the hardness of the compressed portion. Moreover, since the space | interval between the pressing parts adjacent to the said length direction is short and the joint strength by pressing becomes high as the length between the pressing parts adjacent to the said length direction is 20 mm or less, it is a type | mold to an absorber. It is difficult for collapse and the like, and the deformation induction function of the above-described deformation induction portion can be more effectively exhibited.
In addition, in this embodiment, although the pressing parts 84p and 85p are provided intermittently along the length direction of the deformation | transformation induction | guidance | derivation part 8, in this invention, it is not limited to such an aspect, pressing The part may be a continuous squeezing part provided along the length direction of the deformation guiding part, or a continuous squeezing part for each squeezing part along the length direction of the deformation guiding part. And intermittent pressing parts may be provided in a mixed manner.

Next, the pattern of the deformation | transformation induction | guidance | derivation part provided in an absorber in the absorbent article of this invention is demonstrated.
As shown in FIGS. 1 and 3, the disposable diaper 1 according to an embodiment of the present invention, a pair of deformation introducing portion 8, 9 sandwiching the widthwise center axis CA _L extending in the longitudinal direction of the absorbent body 4 And provided at positions separated from each other. When a pair of deformation guiding portions is provided at such a position, a box shape in which an absorbent body or an absorbent article is convex on the non-skin surface side with an area sandwiched between the pair of deformation guiding portions as a bottom portion When the pressure is applied to the absorbent body (especially in the width direction of the absorbent body) by the wearer's buttocks or the like, the edge portions in the length direction and the width direction of the absorbent article are worn. In the central region of the absorbent article (that is, the region straddling both the width-direction central axis C _L and the length-direction central axis C _W of the absorbent article) along the skin surface of the wearer, And the surface sheet can be deformed so as to ensure a certain space (ie, excrement accommodation space), so that liquid excrement can be retained while holding solid excrement in the excrement accommodation space. Absorber can absorb, excretion more efficient Ku absorption, can be held.
Then, in the present embodiment, the pair of deformation introducing portion 8, 9 as shown in FIGS. 1 and 3, in plan view, the axis of symmetry widthwise central axis CA _L extending in the length direction L Further, the pair of deformation guide portions 8 and 9 are each formed in a pattern that is convex outwardly with respect to the central axis in the width direction in plan view. Has been.
More specifically, as shown in FIG. 3, the pair of deformation guide portions 8 and 9 has respective start portions 86 a at the end portions in the width direction of the absorbent body 4 at positions near the ventral end portions of the absorbent body 4. as 96a, a first base point 86b located between said start point 86a, the widthwise central axis CA _L between the end portion in the width direction of the absorber 4 a back side of the absorbent body 4 than 96a, 96b Until the absorber 4 is gently curved so as to be convex inward in the width direction, and then the absorber 4 is further extended from the first base points 86b and 96b than the first base points 86b and 96b. second base point 86c located between a back side edge in the width direction of the absorbent body 4 and the widthwise central axis CA _L, to 96c, and the outwardly convex side in the width direction of the absorbent body 4 Extending from the second base points 86c and 96c. The second base point 86c, the third base point 86d located between the widthwise center axis CA _L and the width direction of the end portion of the absorber 4 a back side of the absorbent body 4 than 96c, to 96d, It extends in a gently curved state so as to protrude outward in the width direction of the absorber 4, and from the third base points 86d and 96d to the back side of the absorber 4 with respect to the third base points 86d and 96d In this case, the end points 86e and 96e located at the end portions in the width direction of the absorber extend in a gently curved state so as to protrude outward in the width direction of the absorber 4.
Thus, a pair of deformation introducing portion 8 and 9, respectively when being formed to include a pattern that is convex outward side with respect to the widthwise central axis C _L in plan view, of the pair Since the region sandwiched between the deformation guiding portions 8 and 9 can be secured widely, when the absorbent article is deformed into a box shape that protrudes toward the non-skin surface as shown in FIG. It becomes easy to deform into a wide box shape. As a result, in the central region of the absorbent article, it is possible to more surely secure a large amount of excrement storage space between the skin surface of the wearer and the top sheet, so that excrement can be more efficiently performed. Can be absorbed and retained.

Moreover, in this embodiment, as shown in FIG. 3, the absorption core 41 which comprises the absorber 4 has the length direction L, the width direction W, and the thickness direction T, and both ends of the said width direction W In the portions corresponding to the first base point to the third base points 86b to 86d and 96b to 96d, a notch portion 43 in which a part of the edge portion of the absorbent core 41 is notched is provided. Yes. When these notches 43 are provided, interference between the ends of the absorber 4 can be prevented when the absorber 4 is deformed along the deformation guiding portions 8 and 9 to become three-dimensional. The absorber 4 is more easily deformed by the predetermined shape. In the present invention, the shape of the notch is not particularly limited, and for example, any shape such as a substantially triangular shape, a rectangular shape, or an oval shape can be adopted. From the standpoint of being more noticeable, the shape of the notch is preferably a shape that tapers inward.
Furthermore, the absorbent core 41, as shown in FIG. 3, the width direction W pair of cutout portions 43 provided at positions which are symmetrical across the widthwise central axis CA _L at both ends of the width direction folding guide line 46-48 connecting portion closest to each other in the central axis CA _L is said have been 3 Hon'nami set in the length direction L, the deformation introducing portion 8,9, at least, the absorbent core 41 Extends from the bending guide line 46 closest to the one end 44 in the length direction L to the bending guide line 48 closest to the other end 45 in the length direction L of the absorbent core 41.
The absorption core 41 configured in this way is easily bent in the length direction L by the three bending guide lines 46 to 48 arranged in parallel in the length direction L, and the absorption core 41 When the absorber 4 is deformed along the deformation guide portions 8 and 9 and the bending guide lines 46 to 48 by the notch portions 43 provided at both end portions in the width direction W of the 41, and is three-dimensionalized. In addition, since the interference between the end portions of the absorber 4 can be prevented, the absorber 4 constituted by such an absorption core 41 is easily deformed with high accuracy by the above-mentioned substantially box-shaped shape.

In the present embodiment, the bending guide lines 46 to 48 are arranged in parallel in the length direction L of the absorbent core 41. In the present invention, the number of the bending guide lines is particularly large. Without limitation, two bending guide wires may be provided in parallel in the length direction of the absorbent core, or four or more bending guide wires may be provided in parallel. However, if three or more bending guide wires are arranged in parallel in the length direction of the absorption core, a deep excrement storage space can be formed, so that excrement can be absorbed and retained more efficiently. can do.
Moreover, in this embodiment, the one end 44 of the length direction L of the absorption core 41 located in the lower side of FIG. 1 is the abdominal end that covers the wearer's abdomen, the absorption core 41 located in the upper part of FIG. The other end 45 in the length direction L is a back-side end portion that covers the wearer's back portion (saddle portion). However, in the present invention, the present invention is not limited to such an embodiment, and the type of absorbent article, etc. Depending on the situation, the one end may be the ventral end and the other end may be the dorsal end.
Furthermore, in this embodiment, as shown in FIG.1 and FIG.2, the absorber 4 or the disposable diaper 1 makes it easy to form the valley fold state by which the skin surface side becomes an inner side by the deformation | transformation induction | guidance | derivation parts 8 and 9. Therefore, the elastic members 6 and 6 are arranged along the length direction L in the vicinity of both end edge portions in the width direction of the disposable diaper 1.

By the way, as above-mentioned, since the absorber 4 in this embodiment contains the absorptive polymer 41S with the water absorbing fiber 41F as an absorptive material, the absorber 4 is steadily excreted (especially liquid excrement). ) Can be absorbed and retained. Furthermore, in this embodiment, the basic weight of the absorptive polymer 41S contained in the deformation | transformation induction | guidance | derivation parts 8 and 9 is lower than the basic weight of the absorptive polymer 41S contained in the base 10. As described above, when the basis weight of the absorbent polymer 41S contained in the deformation induction parts 8 and 9 is lower than that of the base part 10, the deformation induction parts 8 and 9 absorb the liquid excrement when the absorbent body 4 absorbs the liquid excrement. Expansion due to the swelling of the conductive polymer 41S is smaller than that of the base 10. Thereby, since the deformation | transformation induction | guidance | derivation function by the deformation | transformation induction | guidance | derivation parts 8 and 9 becomes difficult to be inhibited, even after the absorber 4 absorbs liquid excrement, the disposable diaper 1 can be stably deformed into a predetermined shape. The excrement can be absorbed and retained more efficiently.
In addition, when a large amount of absorbent polymer 41S is contained in the compressed portions 84p, 85p, 94p, and 95p of the compressed regions 84, 85, 94, and 95 in the deformation guiding portions 8 and 9, the compressed portion 84p, Although the absorbent polymer 41S is exposed to the skin side by pressing when forming 85p, 94p, and 95p, there is a possibility that the touch of the absorbent body 4 through the surface sheet 2 may be reduced. 9, the basis weight of the absorbent polymer 41S contained in the base 10 is lower than the basis weight of the absorbent polymer 41S contained in the base 10, such a problem is less likely to occur, and a decrease in touch can be more reliably suppressed. .

  In the present invention, the basis weight of the absorbent polymer that can be included in the deformation inducing portion is not particularly limited as long as the effect of the present invention is not impaired, but it is less than 80% by mass of the basis weight of the absorbent polymer in the base portion. Is preferred. When the basis weight of the absorbent polymer in the deformation induction part is less than 80% by mass of the basis weight of the absorbent polymer in the base part, even if the absorbent body absorbs liquid excrement, the expansion of the deformation induction part is larger than that of the base part. Since it becomes sufficiently small, the deformation induction function by the deformation induction portions 8 and 9 is hardly inhibited. In the present invention, as described above, the absorbent body may not contain an absorbent polymer, but in order to sufficiently secure the absorption capacity in the deformation induction portion, the basis weight of the absorbent polymer in the deformation induction portion. The amount is preferably 25% by mass or more of the basis weight of the absorbent polymer at the base.

Next, the base of the absorbent body in the absorbent article of the present invention will be described.
As shown in FIG. 4, in the present embodiment, the base 10 of the absorbent body 4 is adjacent to the first convex portions 81, 82, 91, 92 of the deformation guiding portions 8, 9 and the adjacent first convex portions. A concave portion 11 extending from the skin surface side to the non-skin surface side and extending along the shape portions 81, 82, 91, 92, and the skin surface surface adjacent to the concave portion 11 and substantially flat. And a base body 12 formed in a shape. Furthermore, in this embodiment, as shown in FIG. 4, the base body 12 has both a skin surface side and a non-skin surface side formed in a substantially flat shape, and has a substantially constant thickness as a whole. On the other hand, as shown in FIG. 4, the recess 11 has a substantially U-shaped cross section along the width direction W, and is thinner than the base body 12. As shown in FIG. 3, the absorber 4 is basically configured as a base portion 10 except for the deformation guide portions 8 and 9.
Thus, when the recessed part 11 is provided adjacent to each 1st convex part 81, 82, 91, 92 of the deformation | transformation induction | guidance | derivation part 8, 9, the said 1st convex part adjacent to the said recessed part 11 and it is provided. 81, 82, 91, 92, and each boundary portion between the recess 11 and the base body 12 adjacent thereto, a large fiber density difference occurs (that is, a large rigidity difference occurs), and each boundary portion However, since each can function as a folding base point of the absorbent body 4, the absorbent body 4 or the disposable diaper 1 can be further easily deformed into a predetermined shape. Furthermore, since the protrusion of each 1st convex part 81, 82, 91, 92 adjacent to it is more conspicuous if the recessed part 11 is provided in this way, the said 1st convex part 81, 82, 91, 92 is concerned. The softness caused by can be more easily felt through the surface sheet 2, and can provide the wearer with a better touch and feel as an absorbent article.

（１０）上述の（１）のステップにおいて吸収性物品から取り出した吸収体から、吸収性ポリマーのみを、２ｇ〜５ｇ程度を目安として取り出し、その質量Ｗ_Ｓ（ｇ）を測定する。
（１１）取り出した吸収性ポリマーについて、上述の（４）〜（９）と同様のステップを実施し、吸収性ポリマーの保水率Ｈ_Ｓ（％）を算出する。
（１２）吸収性ポリマーと同様に、上述の（１）のステップにおいて吸収性物品から取り出した吸収体から、吸水性繊維のみを、２ｇ〜５ｇ程度を目安として取り出し、その質量Ｗ_Ｐ（ｇ）を測定する。
（１３）取り出した吸水性繊維について、上述の（４）〜（９）と同様のステップを実施し、吸水性繊維の保水率Ｈ_Ｐ（％）を算出する。
（１４）上述の吸収性ポリマーの保水率Ｈ_Ｓを、吸収性ポリマーの質量含有率が１００％のときの吸収コアサンプルの保水率とし、上述の吸水性繊維の保水率Ｈ_Ｐを、吸収性ポリマーの質量含有率が０％のときの吸収コアサンプルの保水率として、それぞれＸ軸を吸収性ポリマーの質量含有率（％）とし、Ｙ軸を吸収コアサンプルの保水率（％）としたグラフにプロットする。
（１５）プロットした２点を直線で結び、該直線の式（Ｙ＝ａＸ＋ｂ）を算出して一次関数の検量線を得る。
（１６）上述の（９）のステップで算出した吸収コアサンプルの保水率Ｈ_Ａ（％）を前記検量線に代入し、前記吸収コアサンプルに含まれる吸収性ポリマーの質量含有率（％）を算出する。
なお、吸収性ポリマーの質量含有率は、同じ測定対象部位における任意の５箇所で測定し、その平均値を採用する。 Furthermore, in this embodiment, the mass content (%) of the absorbent polymer 41S included in the portion extending in the thickness direction on the non-skin surface side of the recess 11 of the absorbent body 4 is included in the base body 12. It is larger than the mass content (%) of the absorbent polymer 41S. Thereby, in the absorbent body 4, excellent absorbency by the absorbent polymer 41S (particularly, excellent absorbency in the vicinity of the first convex portions 81, 82, 91, 92 in which the fiber density of the water absorbent fibers 41F is relatively low). ) In a stable manner, and even after the absorbent body 4 has absorbed liquid excreta, the concave section 11 does not cause the expansion of the absorbent body 4 in the vicinity of the first convex portions 81, 82, 91, 92. It can suppress by being depressed in the skin surface side, and can exhibit the effect show | played by the above-mentioned 1st convex-shaped part 81, 82, 91, 92 continuously.
In the present specification, the mass content (%) of the absorbent polymer means the ratio of the mass of the absorbent polymer to the total mass of the water absorbent fibers and the absorbent polymer contained in the absorbent body. And this mass content rate (%) can be calculated | required according to the following [Measurement method of the mass content rate of an absorptive polymer].
[Method for measuring mass content of absorbent polymer]
(1) Take out the absorbent body from the absorbent article (At this time, if the absorbent body and other members (surface sheet, etc.) are joined, remove the other members), and further from the removed absorbent body Using a sharp cutter, only the measurement target site of the mass content of the absorbent polymer is cut out to obtain a measurement target site piece.
(2) The small piece is immersed in a toluene solution, the core wrap is removed from the small piece, and a water absorbent fiber and an absorbent polymer (hereinafter referred to as “absorbing core sample”) are taken out.
(3) The absorbent core sample taken out from the small piece is dried for 12 hours or more in a drier set at 80 ° C.
(4) The dried absorbent core sample is put in a nylon mesh bag, and its mass W ₀ (g) is measured.
Incidentally, the mesh bag made of nylon, water-absorbent fibers and absorbent polymer of the absorbent core samples using the one having a network structure so as not to fall off before entering the absorbent core samples, previously its mass W _{M (g)} Measure it.
(5) from the measured mass _W 0 (g) subtracting the mesh bag weight _W M (g), to calculate a mass _W 1 of the dry absorbent core sample (g).
(6) The above-described dried absorbent core sample is immersed in ion-exchanged water for 60 minutes together with the mesh bag, and then dehydrated with a centrifugal dehydrator (centrifugal force: 150 G, dehydration time: 2 minutes).
(7) The absorption core sample after dehydration is measured by measuring the total mass W ₂ (g) of the absorbent core sample and the mesh bag and subtracting the mass W _M (g) of the mesh bag from the total mass W ₂ (g). to the calculated water retention amount _W a (g).
(8) After performing the above step (6) using only nylon mesh bags of the same size and mass, and subtracting the mass of the mesh bag measured in advance from the mass of the mesh bag after dehydration. The water retention amount W _B (g) of the mesh bag is calculated.
(9) The water retention rate H _A (%) of the absorbent core sample is calculated using the following formula (1).

(10) from the absorber was removed from the absorbent article in step (1) above, only the absorbent polymer, is taken out as a guideline about 2G～5g, measuring its mass _W S (g).
(11) The same steps as in the above (4) to (9) are performed on the extracted absorbent polymer, and the water retention rate H _S (%) of the absorbent polymer is calculated.
(12) Similarly to the absorbent polymer, from the absorbent body taken out from the absorbent article in the above step (1), only the water-absorbing fibers are taken out with about 2 to 5 g as a guide, and its mass W _P (g) Measure.
(13) Steps similar to the above (4) to (9) are performed on the extracted water-absorbing fibers, and the water retention rate H _P (%) of the water-absorbing fibers is calculated.
(14) The water retention H _S of the absorbent polymer described above, the mass content of the absorbent polymer is the water retention of the absorbent core samples with 100%, the water retention rate H _P of absorbent fibers described above, the absorbent Graph showing the water retention rate of the absorbent core sample when the mass content of the polymer is 0%, with the X axis as the mass content of the absorbent polymer (%) and the Y axis as the water retention rate (%) of the absorbent core sample, respectively. Plot to.
(15) Connect the two plotted points with a straight line, calculate the equation (Y = aX + b) of the straight line, and obtain a calibration curve of a linear function.
(16) Substituting the water retention rate H _A (%) of the absorbent core sample calculated in step (9) above into the calibration curve, and calculating the mass content (%) of the absorbent polymer contained in the absorbent core sample calculate.
In addition, the mass content rate of an absorptive polymer measures in arbitrary 5 places in the same measurement object site | part, and employ | adopts the average value.

In the present invention, the mass content of the absorbent polymer contained in the portion extending in the thickness direction on the non-skin surface side of the concave portion of the base is the mass content of the absorbent polymer contained in the base body of the base. It is preferably in the range of 1.05 to 1.50 times, more preferably in the range of 1.10 to 1.40 times, and still more preferably in the range of 1.15 to 1.30 times. The mass content of the absorbent polymer contained in the portion extending in the thickness direction on the non-skin surface side of the concave portion of the base is 1.05-1 of the mass content of the absorbent polymer contained in the base main body of the base. In the range of 50 times, in the absorbent body, the excellent absorbency by the absorbent polymer (particularly, excellent absorbency in the vicinity of the first convex portion where the fiber density of the water absorbent fiber is relatively low) is stable. Even after the absorber absorbs the liquid excreta while ensuring the safety, the expansion of the absorber in the vicinity of the first convex portion can be more reliably suppressed, and the above-described first convex portion is effective. Effect can be exhibited more sustainably. In particular, the content of the absorbent polymer contained in the portion extending in the thickness direction on the non-skin surface side of the concave portion of the base is 1.05 times the mass content of the absorbent polymer contained in the base main body of the base. If it is the above, there also exists an advantage that it is easy to form the said recessed part adjacent to a said 1st convex-shaped part.
In the present invention, since the concave portion of the base portion is not an essential constituent element, when the concave portion is not formed in the base portion, the content of the absorbent polymer is simply set to a predetermined value or less (that is, a change in manufacturing equipment, etc.) Can be manufactured easily).

Next, an absorbent body used in an absorbent article according to another embodiment of the present invention will be described in detail with reference to the drawings. Note that configurations other than the portions different from the above-described embodiment basically have the same configuration as the above-described embodiment, and thus description thereof is omitted.
FIGS. 6A to 6C are end views corresponding to FIG. 4 of an absorbent body used in an absorbent article according to another embodiment of the present invention. FIG. 7 is a plan view of an absorbent body 4d used in an absorbent article according to still another embodiment of the present invention. In these drawings, components related to the same components as those in the above-described embodiment are denoted by the same reference numerals as those in the above-described embodiment.

In another embodiment of the present invention shown in FIG. 6A, the absorbent body 4a includes an absorbent core 41a made of water absorbent fibers 41Fa and at least one liquid-permeable sheet covering the outer peripheral surface of the absorbent core 41a. The absorbent core 41a does not contain an absorbent polymer. In addition, the fiber similar to the water absorbing fiber 41F used in the above-mentioned embodiment can be used for the water absorbing fiber 41Fa. In this other embodiment, since the absorber 4a does not contain an absorptive polymer, the softness of the absorber 4a as a whole is improved as compared with that containing an absorptive polymer.
In another embodiment shown in Drawing 6 (a), as for absorber 4a, base 10a is constituted only by base part main part 12a, and base 10a is provided with recess 11 provided in the above-mentioned embodiment. There is no equivalent. That is, the base portion 10a is configured by a base body 12a in which both the skin surface side and the non-skin surface side are formed in a substantially flat shape as a whole, and has a substantially constant thickness as a whole. . Since the entire surface on the skin surface side of the base portion 10a is substantially flat, even if the skin surface of the wearer touches the base portion 10a via the surface sheet 2, the wearer feels a feeling of unevenness or the like. There is no, and a good touch and a feeling of wear can be provided.

  In another embodiment shown in FIG. 6 (a), the absorber 4a includes a pair of deformation guide portions 8a and 9a extending in a predetermined direction (length direction L) as in the above-described embodiment, and these Base portions 10a disposed on both sides of each of the deformation guide portions 8a and 9a. Further, the deformation guiding portion 8a (9a) extends in the length direction L and protrudes from the base portion 10a toward the skin surface side, and the first convex portions 81a and 82a (91a and 92a), One second convex portion 83a (93a) extending in the length direction L between the two first convex portions 81a, 82a (91a, 92a) and projecting to the skin surface side, and each first A squeezed portion that extends in the length direction L between the convex portions 81a and 82a (91a and 92a) and the second convex portion 83a (93a) and that compacts the absorber 4a in the thickness direction T. Squeezing regions 84a and 85a (94a and 95a) including 84pa and 85pa (94pa and 95pa), respectively, the first convex portions 81a and 82a (91a and 92a) and the second convex portion 83a. Each fiber density of (93a) It is lower than the fiber density of the base portion 10a. In this other embodiment, the absorbent body 4a does not contain an absorbent polymer, and the first convex portions 81a, 82a (91a, 92a) and the second convex portions 83a (93a) are soft. For this reason, the deformation guiding portion 8a (9a) can provide the wearer with a better feel and feel in addition to the effects achieved by the deformation guiding portion 8 (9) of the above-described embodiment. .

Further, in still another embodiment of the present invention shown in FIG. 6B, the absorbent body 4b includes a pair of deformation guide portions 8b and 9b extending in a predetermined direction (length direction L), and these deformation guide portions 8b. , 9b and a base 10 disposed on each side. Further, the deformation guiding portion 8b (9b) extends in the length direction L and protrudes from the base portion 10 toward the skin surface side, and the first convex portions 81b and 82b (91b and 92b), One second convex portion 83b (93b) extending in the longitudinal direction L and projecting to the skin surface side between the two first convex portions 81b, 82b (91b, 92b), and each first A squeezed portion that extends in the length direction L between the convex portions 81b and 82b (91b and 92b) and the second convex portion 83b (93b) and that compacts the absorber 4b in the thickness direction T. Squeezing regions 84b and 85b (94b and 95b) including 84pb and 85pb (94pb and 95pb), and the first convex portions 81b and 82b (91b and 92b) and the second convex portion 83b. Each fiber density of (93b) is It is lower than the fiber density of the parts 10.
And in another embodiment shown in this FIG.6 (b), the thickness of the said 2nd convex-shaped part 83b (93b) is formed smaller than the average thickness of the base 10. As shown in FIG. Therefore, in this other embodiment, since the thickness of the second convex portion 83b (93b) existing in the substantially central region in the width direction of the deformation guiding portion 8b (9b) is small, the absorber 4b 10 and each first convex part 81b, 82b (91b, 92b), between each first convex part 81b, 82b (91b, 92b) and each pressing area 84b, 85b (94b, 95b), And when each boundary part between 2nd convex-shaped part 83b (93b) and each pressing area | region 84b, 85b (94b, 95b) bend | folded as a fold | fold base point, each said 1st convex-shaped part 81b, 82b (91b) 92b) hardly interfere with each other (collision), and the absorbent article can be more reliably deformed into a predetermined shape.

  In the present specification, the “average thickness of the base” means an average thickness at any five locations in the base (in the case where the base has a recess, the base body other than the recess). This “average thickness of the base” is measured by sequentially performing the steps (1) to (3) in the above-mentioned [Fiber Density Measuring Method], respectively, at the arbitrary five locations in the base. It can be obtained by calculating an average value.

  Further, in the embodiment shown in FIG. 6 (b), the width of the second convex portion 83b (93b) (that is, the length in the width direction W) is the first convex portion 81b, 82b (91b, 92b) is narrower than any width. Therefore, in this embodiment, since the width of the second convex portion 83b (93b) existing in the central region in the width direction of the deformation guide portion 8b (9b) is narrow, the absorber 4b The first convex portions 81b and 82b (91b and 92b) are unlikely to interfere (collision) with each other when the base material is bent, and the absorbent article can be more reliably deformed into a predetermined shape.

In addition, in still another embodiment of the present invention shown in FIG. 6C, the absorber 4c includes a pair of deformation guide portions 8c, 9c extending in a predetermined direction (length direction L), and these deformation guide portions 8c. , 9c, and a base 10 disposed on each side. Further, the deformation guiding portion 8c (9c) extends in the length direction L and protrudes from the base portion 10 toward the skin surface side. The two first convex portions 81c ₁ , 82c ₁ (91c ₁ , 92c ₁₎ ) And the two first convex portions 81c ₁ , 82c ₁ (91c ₁ , 92c ₁ ), and one second convex portion 83c extending in the length direction L and projecting to the skin surface side. ₁ (93c ₁ ), the first convex portions 81c ₁ , 82c ₁ (91c ₁ , 92c ₁ ) and the second convex portions 83c ₁ (93c ₁ ), extending in the length direction L, and a compressing portion 84pc was consolidated in the thickness direction T of the absorbent body 4c from the skin surface side _{1, 85pc 1 (94pc 1,} 95pc 1) compressed regions _84c 1 _{comprising, 85c 1 (94c 1, 95c} 1), In addition, the non-absorbent body 4c In the surface side, the two first protrusions _{81c 1,} 82c _{1 (91c} 1, 92c ₁₎ of the two third convex portion 81c projecting from the base 10 in correspondence with each of the non-skin side ₂ , 82c ₂ (91c ₂ , 92c ₂ ) and a fourth convex portion 83c ₂ (93c ₂₎ projecting toward the non-skin surface side of the absorbent body 4c corresponding to the second convex portion 83c ₁ (93c ₁ ). ) And the third convex portions 81c ₂ , 82c ₂ (91c ₂ , 92c ₂ ) and the fourth convex portions 83c ₂ (93c ₂ ), the pressed portions 84pc ₁ , 85pc ₁ on the skin surface side. (94 pc ₁ , 95 pc ₁ ) and the non-skin having the non-skin surface side compressed portions 84 pc ₂ , 85 pc ₂ (94 pc ₂ , 95 pc ₂ ) in which the absorbent body 4 c is pressed in the thickness direction T from the non-skin surface side. side compressed regions _84c 2, 85 _{2 (94c} 2, 95c ₂₎ and, optionally wherein the first convex portion _{81c 1, 82c 1 (91c 1} , 92c 1), the second convex portion _83c 1 _(93c 1), the third The fiber density of each of the convex portions 81c ₂ and 82c ₂ (91c ₂ and 92c ₂ ) and the fourth convex portion 83c ₂ (93c ₂ ) is lower than the fiber density of the base portion 10.
In the embodiment shown in FIG. 6 (c), the absorbent body 4c has not only the skin surface side but also the non-skin surface side, and the third convex portions 81c ₂ and 82c ₂ (which are soft) having low fiber density (ie, soft). and 91c _2, 92c ₂₎ and fourth respective convex portions of the convex portions _{83c 2} (93c 2), and non-skin side compressed regions _{84c 2, 85c 2 (94c 2} , 95c 2), is provided with the In addition, the absorbent body 4c is easily bent to the non-skin side (that is, the degree of freedom of deformation of the absorbent body 4c is high), and the absorbent article is flexibly adapted to the body shape and movement of the wearer and easily deformed. can do. As a result, it is possible to further improve the leak-proof property and wearing feeling of the absorbent article.

  Moreover, in each above-mentioned embodiment, although the deformation | transformation induction | guidance | derivation part is provided with one 2nd convex-shaped part between two 1st convex-shaped parts, in this invention, it is limited to such an aspect. In yet another embodiment of the present invention, the deformation guiding portion includes two or more second convex portions between two first convex portions extending in a predetermined direction, and further adjacent to each other. Between the 2nd convex-shaped parts, the subcompression area | region which has the pressing part which each extended in the predetermined direction and consolidated the absorber to the thickness direction is provided. When the absorbent body is configured in this manner, a plurality of portions having a rigidity difference that can function as a folding base point of the absorbent body are formed according to the number of the second convex portions and the sub-squeezing regions. In addition to ensuring a wider range of bending of the absorbent body, it is possible to suitably maintain a state in which the absorbent body is easily folded even after absorption of liquid excreta.

In still another embodiment of the present invention, as shown in FIG. 7, the absorbent body 4d includes a pair of deformation guide portions 8 ′ and 9 ′ extending in a predetermined direction (length direction L) in plan view. , End side deformation guide portions 8A, 8B, 9A, 9B extending in the length direction L and connected to both ends of the pair of deformation guide portions 8 ′, 9 ′ in the length direction L, , And base portions 10 ′ disposed on both sides of the end portion side deformation guide portions 8 </ b> A, 8 </ b> B, 9 </ b> A, 9 </ b> B. Further, one of the pair of deformation guiding portions 8 ′ and 9 ′ has two first deformation guiding portions 8 ′ extending in the length direction L and projecting from the base portion 10 ′ to the skin surface side. One second convex portion 83 extending in the length direction L and projecting to the skin surface side between the convex portions 81 ′, 82 ′ and the two first convex portions 81 ′, 82 ′. And the two first convex portions 81 ′, 82 ′ and the second convex portion 83 ′ extend in the length direction L, and the absorber 4 d extends in the thickness direction T. Squeezing regions 84 'and 85' including compressed portions 84'p and 85'p, and the other deformation guiding portion 9 of the pair of deformation guiding portions 8 'and 9'. 'Extends in the length direction L and protrudes from the base portion 10' toward the skin surface side, and the two first convex portions 91 'and 92'. 'Between One second convex portion 93 ′ extending in the length direction L and projecting to the skin surface side, the two first convex portions 91 ′, 92 ′ and the second convex portion 93 ′. Squeezing regions 94 ′ and 95 ′ including squeezed portions 94 ′ p and 95 ′ p that extend in the longitudinal direction L and are compacted in the thickness direction T, respectively. ing.
And each of the said edge part side deformation | transformation induction | guidance | derivation part 8A, 8B (9A, 9B) is extended in the said length direction L, and the two edge part side 1st protrusions which protrude in the skin surface side from the said base 10 '. Between the first and second end portions 81A, 82A, 81B, and 82B (91A, 92A, 91B, and 92B) and the first convex portions 81A, 82A, 81B, and 82B (91A, 92A, 91B, and 92B). End side compressed regions 84A, 84B (94A, 94B) each having a compressed portion 84pA, 84pB (94pA, 94pB) that extends in the length direction L and has the absorber 4d consolidated in the thickness direction T; Each of the end-side first convex portions 81A, 82A, 81B, 82B (91A, 92A, 91B, 92B) is lower than the fiber density of the base 10 ′, End side compression 84A, 84B (94A, 94B) is the inner side in the plan view of the absorbent article in the compressed regions 84 ′, 85 ′ (94 ′, 95 ′) of the deformation guiding portion 8 ′ (9 ′). Is connected to one end of the compressed region 84 ′ (94 ′) located at
Further, the base portion 10 'of the absorber 4d is adjacent to each of the first convex portions 81', 82 ', 91', 92 'of the deformation guiding portions 8', 9 'and each of the adjacent first portions. A concave portion 11 ′ that extends along the convex portions 81 ′, 82 ′, 91 ′, 92 ′ and is recessed from the skin surface side to the non-skin surface side, and the end side deformation guide portion 8 </ b> A, First end portions 81A, 82A, 81B, 82B (91A, 92A, 91B, 92B) of each end portion side of 8B (9A, 9B) are adjacent to and adjacent to each first convex portion 81A, 82A. , 81B, 82B (91A, 92A, 91B, 92B), extending from the skin side surface to the non-skin surface side and extending toward the non-skin surface side, and the respective recess portions 11 ′ and A base body 12 ′ adjacent to the end-side recesses 11A and 11B and having a substantially flat surface on the skin surface side.

In the embodiment shown in FIG. 7, the region where the end side deformation guiding portions 8A and 8B (9A and 9B) of the absorber 4d are present (that is, both the ventral side and the back side in the length direction L of the absorber 4d). In the end portion side region), the hardness of the squeezed portions 84pA and 84pB (94pA and 94pB) of the end side squeezing regions 84A and 84B (94A and 94B) is maintained to the wearer while maintaining the deformation induction function. Sensation can be made difficult, and a better feel and wearing feeling can be provided to the wearer. Moreover, the said edge part side compression area | region 84A, 84B (94A, 94B) is the said absorptivity in the compression area | region 84 ', 85' (94 ', 95') of the said deformation | transformation induction | guidance | derivation part 8 '(9'). Since it is connected to one end of the compressed region 84 ′ (94 ′) located on the inner side in plan view of the article (that is, the end side compressed regions 84A and 84B (94A and 94B) are absorbent 4d. ), Because it is provided at a position distant from the edge in the width direction of the wearer, the squeezing portion 84pA of the hard end portion side squeezing region 84A, 84B (94A, 94B), The touch of 84 pB (94 pA, 94 pB) is difficult to be transmitted, and the above-mentioned good touch and wearing feeling can be maintained.
In the embodiment shown in FIG. 7, the end side deformation guiding portions 8A and 8B (9A and 9B) are connected to both end portions in the length direction L of the deformation guiding portion 8 ′ (9 ′). However, in the present invention, the end side deformation guide portion is not limited to such an aspect, and the end side deformation guide portion is one end portion (that is, the ventral side or the back side) of the deformation guide portion in a predetermined direction (length direction). Any one end part) may be connected.

  Hereinafter, the manufacturing method of the absorber 4 (namely, absorber 4 shown in FIG.3 and FIG.4) used for the disposable diaper 1 which concerns on one Embodiment of this invention is demonstrated. In addition, since the disposable diaper 1 can be manufactured by a normal manufacturing method known in the art, processes other than the manufacturing process of the absorbent body 4 (for example, a stacking process of a top sheet and a back sheet) can be manufactured. The description is omitted below.

FIG. 8 is a schematic diagram for explaining an example of the manufacturing apparatus 100 for the absorbent body 4 used in the disposable diaper 1 according to the embodiment of the present invention. FIG. 9A shows an X portion of FIG. FIG. 9B is an enlarged schematic view of the main part viewed from the MD direction, and FIG. 9B schematically shows the state of the first stacked body stacked in the mold member provided on the outer peripheral surface of the suction drum from the MD direction. It is a principal part expanded end view shown. In this specification, the direction along the material or product conveyance direction F is referred to as the MD direction, and the direction orthogonal to the MD direction on the horizontal plane (that is, the width direction of the production line) is referred to as the CD direction. The direction orthogonal to the direction and the CD direction (that is, the vertical direction of the production line) is referred to as the TD direction.
This manufacturing apparatus 100 sucks the absorbent material in the conveyance pipe 101 and conveys the absorbent material including the opened water absorbent fibers 41F and the absorbent polymer 41S, and absorbs these absorbent materials. Are laminated in a plurality of concave mold members 103 arranged at regular intervals along the circumferential direction on the outer peripheral surface, whereby the first laminated body 401 that becomes the absorbent core 41 of the absorbent body 4 in a later step. A continuous suction drum 102 and a first laminated body 401 on the outer peripheral surface of the suction drum 102, and a continuous long core wrap covering the outer peripheral surface of the first laminated body 401. An unwinding roll 104 for a core wrap continuum for unwinding the body 402.

Furthermore, the manufacturing apparatus 100 pressurizes the second laminated body 403 obtained by laminating the core wrap continuous body 402 on the first laminated body 401 in the TD direction (that is, the thickness direction of the laminated body 403), and evenly. A press device 105 having a pair of upper and lower press rolls 105a and 105b to be compressed, and a third laminate that is positioned downstream of the press device 105 in the conveying direction F and is compressed in the TD direction by the press device 105 And a pressing device 106 that squeezes a predetermined position 405 in the TD direction and performs embossing.
In addition, the 4th laminated body 406 embossed with the pressing apparatus 106 is cut | disconnected in the shape of the absorber 4 downstream from the pressing apparatus 106 in the conveyance direction F, and the single absorber 4 is formed. A cutting device (not shown), a top sheet laminating device (not shown) for supplying and laminating the top sheet continuous body on the upper surface of the absorbent body 4, and a back sheet continuous body for feeding and laminating the bottom surface of the absorbent body 4 A back sheet laminating device (not shown). These cutting devices, top sheet laminating devices, and back sheet laminating devices can be arranged in any order in the transport direction F. Moreover, in embodiment which squeezes a surface sheet and an absorber together, the said surface sheet lamination | stacking apparatus is arrange | positioned in the upstream in the conveyance direction F of the above-mentioned press apparatus.
Moreover, the squeezing device 106 forms the squeezing regions 84 and 85 (94 and 95) of the deformation guiding portion 8 (9) in the absorbent body 4, and has a pair of upper and lower rolls 106a and 106b. A plurality of emboss pins in which the roll 106a (the upper roll in FIG. 8) is arranged in accordance with the shape and position of the pressing portions 84p and 85p (94p and 95p) of the pressing regions 84 and 85 (94 and 95). Is an embossing roll with an outer peripheral surface. The other roll 106b (lower roll in FIG. 8) is an anvil roll with a flat outer peripheral surface.

  When manufacturing the absorber 4 using the manufacturing apparatus 100 described above, the first step of forming the first laminate 401 by laminating the absorbent material including the water absorbent fibers 41F and the absorbent polymer 41S; The second step of forming the second laminated body 403 by covering the first laminated body 401 with the core wrap continuous body 402, and pressurizing the second laminated body 403 in the TD direction by the press device 105, and evenly A third step of forming the third laminated body 405 by compressing to a predetermined position, and a predetermined position of the third laminated body 405 is squeezed in the TD direction (thickness direction) by the squeezing device 106 and embossed. Thus, the fourth step of forming the fourth stacked body 406 is sequentially performed.

First, in the first step of forming the first laminate 401, the absorbent material including the water absorbent fibers 41F and the absorbent polymer 41S is sucked by the suction drum 102 through the transport pipe 101, and the suction drum 102 The first laminated body 401 is formed by laminating in the mold member 103 disposed on the outer peripheral surface of the first laminated body 103. At this time, as shown in FIG. 9A, the absorbent material is supplied into the mold member 103 from the upper side in the TD direction, and the mold member 103 is provided at the bottom of the suction drum 102 in the circumferential direction. And a pair of protrusions 103a and 103b having a substantially trapezoidal cross-sectional shape along the CD direction. The pair of protrusions 103a and 103b are located at positions corresponding to the positions of the pair of deformation guide portions 8 and 9 in the absorbent body 4 and have a length corresponding to the shape and width of the pair of deformation guide portions 8 and 9 in the length direction. It is disposed at the bottom of the mold member 103 in a manner having a shape and a width in the vertical direction. Further, the mold member 103 protrudes upward in the TD direction from the bottom in FIG. 9A and extends inward from both ends in the CD direction (in this embodiment, a suction drum). There are three pairs of protrusions (not shown) for forming notches in the circumferential direction of 102.
The absorbent polymer 41S supplied into the mold member 103 through the transport pipe 101 is a part of the absorbent polymer 41S other than the protrusions 103a and 103b because a part of the absorbent polymer 41S collides with the tip surfaces of the protrusions 103a and 103b and bounces back. Therefore, it is deposited in the mold member 103 with the bottom 103c around the protrusions 103a and 103b as the center. Note that the absorbent polymer 41S rebounds when it collides with the tip surfaces of the protrusions 103a and 103b of the mold member 103. The absorbent polymer 41S is granular and has a relatively high mass per absorbent polymer. It is considered that this is because it is large and easily affected by the kinetic energy of the absorbent polymer 41S itself due to the suction of the suction drum 102. On the other hand, the water absorbent fiber 41F has flexibility and can absorb the energy even if it collides with the tip surfaces of the protrusions 103a and 103b due to the flexibility. Therefore, the water absorbent fiber 41F has the protrusion 103a described above. , 103 b does not rebound or move even if it collides with the front end face of 103 b, and deposits in the mold member 103 substantially evenly.
In addition, since the manner in which the absorbent polymer 41S is deposited on the bottom 103c of the portion other than the protrusions 103a and 103b depends on the cross-sectional shape along the CD direction of the protrusions 103a and 103b, the cross-sectional shape is appropriately selected. Thus, it is possible to control the manner in which the absorbent polymer 41S is deposited. As a result, the structure of the concave portion 11 (particularly, the length of the concave portion 11 in the width direction W, the depth in the thickness direction T, etc.) is controlled. be able to.

As shown in FIG. 9B, the first laminate 401 formed in this way has a plurality of regions having different basis weights of the absorbent polymer 41S in the CD direction (width direction). Specifically, in the first laminated body 401, portions corresponding to the portions directly above the pair of protrusions 103a and 103b in the mold member 103 collide with the tip surfaces of the protrusions 103a and 103b and the protrusions 103a and 103b. Thus, the basis weight of the absorbent polymer 41S is reduced by the amount of movement of the absorbent polymer 41S, so that the low basis weight regions 201 and 202 are obtained. Of the portions corresponding to the portions directly above the protrusions 103a and 103b, the absorbent polymer 41S collides with the tip surfaces of the protrusions 103a and 103b in the vicinity of the tip surfaces of the protrusions 103a and 103b. Since it moves to the bottom part 103c other than the protrusions 103a and 103b, the absorbent polymer 41S is hardly present and the water-absorbing fibers 41F are mainly present. After the fibers 41F are deposited, the absorbent polymer 41S is also deposited uniformly in the width direction. Therefore, of the portion corresponding to the portion directly above the protrusions 103a and 103b, other than the vicinity of the tip surfaces of the protrusions 103a and 103b. About the part of this, the absorptive polymer 41S exists in the quantity according to the predetermined | prescribed supply ratio similarly to the other area | region in the width direction.
On the other hand, the portion along the side wall portion of the pair of protrusions 103a and 103b and the vicinity thereof has the amount of the absorbent polymer 41S that has rebounded and moved at the tip surfaces of the protrusions 103a and 103b. Since the basis weight becomes higher, it becomes the high basis weight regions 203 to 206. Further, in the mold member 103, a portion where the absorbent polymer 41S is not affected by the pair of protrusions 103a and 103b (that is, the absorbent polymer 41S does not bounce off and move at the tip surfaces of the protrusions 103a and 103b). (Part) is because the absorbent polymer 41S is deposited evenly, the basis weight of the absorbent polymer 41S is lower than the high basis weight regions 203 to 206 and higher than the low basis weight regions 201, 202. Regions 207 to 209.
More specifically, from one side in the width direction in the mold member 103 to the other side (from the left side to the right side in FIG. 9B), the region 207 in which the basis weight of the absorbent polymer 41S is medium basis weight is high. Basis area 203, low basis weight area 201, high basis weight area 204, medium basis weight area 208, high basis weight area 205, low basis weight area 202, high basis weight area 206, medium basis weight area 206, medium basis weight The quantity areas 209 are arranged in order. In particular, the area 201 (202) having a low basis weight of the absorbent polymer 41S is located between the two high basis weight areas 203 and 204 (205 and 206).
The first laminated body 401 is formed of three pairs of notch portions formed by the above-described projections for forming the notch portions, in which part of the edge portions are notched at both ends in the width direction ( (Not shown).

Then, after the first step, the first laminated body 401 in the mold member 103 is placed on the core wrap continuum 402 in a state where an adhesive such as a hot-melt adhesive is interposed by the rotation of the suction drum 102. A second step of forming the second laminated body 403 is performed by transferring and placing, and covering the outer peripheral surface of the first laminated body 401 with the core wrap continuous body 402. FIG. 10A is an enlarged end view of the main part of the end surface corresponding to FIG. 4 of the second laminated body before being compressed by the press device in the manufacturing process of the absorbent body 4.
In this second step, as shown in FIG. 8, first, the suction drum 102 unwinds the first laminated body 401 in the mold member 103 from the unwinding roll 104 for the core wrap continuum, and the conveying direction. Transfer and place on the upper surface of the core wrap continuum 402 moving to F. Then, the core wrap continuum 402 is bent in the CD direction perpendicular to the conveying direction F along the outer peripheral surface of the first laminated body 401 by an arbitrary bending means (not shown), and the core wrap continuous body 402 is bent into the first laminated body 401. A long second laminate 403 is formed as shown in FIG.

After the completion of the second step, a third step of forming the third stacked body 405 by further compressing the second stacked body 403 in the TD direction (thickness direction) is performed. In addition,
FIG. 10B is an enlarged end view of the main part of the end surface corresponding to FIG. 4 of the third laminated body during compression by the press device (before bulk recovery) in the manufacturing process of the absorbent body 4, and FIG. c) is the principal part expanded end elevation of the end surface equivalent to FIG. 4 of the 3rd laminated body after volume recovery after compression with a press apparatus in the manufacturing process of the absorber 4 (before a pressing process).
In the third step, the second laminate 403 formed in the second step is compressed in the thickness direction by passing between the pair of upper and lower press rolls 105a and 105b of the press device 105. . At this time, as shown in FIG. 10B and FIG. 10C, the regions having different basis weights of the absorbent polymer 41S in the width direction of the first laminate 401 are also compressed in the thickness direction as they are. Therefore, also in the 3rd laminated body 405 after compression, the state from which the basic weight of the absorptive polymer 41S differs in the said width direction is maintained.
Moreover, since the absorbent polymer 41S enters the gap between the surrounding water absorbent fibers 41F when compressed by the pair of press rolls 105a and 105b, the absorbent polymer 41S is formed in the laminate 404 during compression. The existing portion is pressed and hardened by pressurization by the pair of press rolls 105a and 105b.

The laminated body 404 at the time of compression shown in FIG. 10B is recovered to some extent after passing through the press device 105, and the third laminated body as shown in FIG. 10C is recovered. 405.
More specifically, the laminated body 404 at the time of compression is restored to a certain thickness as a whole by the influence of the flexibility of the water absorbent fibers 41F after passing through the press device 105. FIG. As shown in FIG. 3, in the regions 203 to 206 where the basis weight of the absorbent polymer 41S is high, the amount of the absorbent polymer 41S entering the gaps between the water absorbent fibers 41F is large, so that it is compressed by pressurization. The thickness does not recover much. On the other hand, in the area 207 to 209 where the basis weight of the absorbent polymer 41S is medium basis weight, the amount of the absorbent polymer 41S entering the gap between the water absorbent fibers 41F is higher than that of the above high basis weight areas 203 to 206. Since there are few, thickness will recover rather than the area | regions 203-206 of the above-mentioned high basic weight. Further, in the areas 201 and 202 where the basis weight of the absorbent polymer 41S is low, the amount of the absorbent polymer 41S entering the gap between the water absorbent fibers 41F is extremely small, and the amount of the flexible water absorbent fibers 41F is small. Because of the large amount, it is not compressed much even when pressurized, and the thickness recovers more than the medium basis weight regions 207 to 209.
As a result, the regions 203 to 206 having a high basis weight of the absorbent polymer 41S in the laminate 404 at the time of compression are not recovered in thickness, as shown in FIG. Portions 303 to 306 corresponding to the recess 11 of the base 10 are formed. In addition, since the area | region where the basic weight of this absorptive polymer 41S is a high basic weight is formed in four places as shown in FIG.10 (b), four parts corresponded to the above-mentioned recessed part 11 are also formed. The Rukoto. Further, in the laminate 404 at the time of compression, the regions 201 and 202 in which the basis weight of the absorbent polymer 41S is low are recovered on the upper surface side, and the protruding portions 301 and 302 that gently protrude on the upper surface side are provided. It is formed. These projecting portions 301 and 302 are portions corresponding to the pair of deformation guiding portions 8 and 9 in the absorbent body 4 as a whole. In addition, since the area | region where the basic weight of this absorptive polymer 41S is low basic weight is formed in two places as shown in FIG.10 (b), the said protrusion parts 301 and 302 are also formed two. It becomes. Further, in the laminated body 404 at the time of compression, the regions 207 to 209 in which the basis weight of the absorbent polymer 41S is medium basis weight are restored to some extent, and the portion 307 corresponding to the base body 12 in the base 10 of the absorber 4 ~ 309. In addition, since the area | region where the basic weight of this absorptive polymer 41S is medium basic weight is formed in three places as shown in FIG.10 (b), three parts equivalent to the above-mentioned base main body 12 are also formed. Will be.
Finally, the state in which the portions 303 to 306 corresponding to the concave portion 11 of the base 10 of the absorber 4, the protrusions 301 and 302, and the portions 307 to 309 corresponding to the base main body 12 of the base 10 are formed as described above. The third stacked body 405 is obtained.

And after completion | finish of the said 3rd process, the 4th laminated body 406 is formed by squeezing the protrusion parts 301 and 302 of the 3rd laminated body 405 with the pressing apparatus 106, and embossing it. Perform the process.
In this 4th process, the 3rd laminated body 405 formed by passing the 3rd laminated body 405 formed in the above-mentioned 3rd process between the upper and lower rolls 106a and 106b of the pressing device 106 is passed. The protrusions 301 and 302 are squeezed in the thickness direction. At this time, the embossed spin of the embossing roll, which is the upper roll 106a of the pressing device 106, is sandwiched between two substantially central portions (substantially apexes of the protruding portions) in the width direction of the protruding portions 301 and 302 of the third laminated body 405. The portions are sequentially squeezed in the thickness direction. The compressed portions of the protruding portions 301 and 302 are portions corresponding to the compressed regions 84, 85, 94, and 95 of the absorbent body 4, and more specifically, the compressed portions 84p, 85p, 94p, and 95p, respectively. Moreover, the part (namely, part which is not squeezed) of the both sides of the length direction of a pressing part in the protrusion parts 301 and 302 is respectively 1st convex-shaped part 81, 82, 91, 92 and 2nd convex of the absorber 4. This is a portion corresponding to the shape portions 83 and 93.
In this way, the above-described fourth stacked body 406 is formed.

After completion of the fourth step, the fourth laminated body 406 is cut into the shape of the absorbent body 4 by a cutting device (not shown), and the single absorbent body 4 is formed.
And the disposable diaper 1 as shown in FIG.1 and FIG.2 is completed by laminating | stacking or joining the absorber 4 manufactured in this way with various members, such as the surface sheet 2 and the back surface sheet 3. FIG.

The manufacturing method of the absorber used for the absorbent article of this invention will not be specifically limited if the structure of the above-mentioned deformation induction part can be formed, Arbitrary manufacturing methods are employable.
For example, the absorber 4a of the embodiment shown in FIG. 6A described above can be manufactured as follows.

FIG. 11 shows an example of a manufacturing apparatus 110 for manufacturing the absorbent body 4a of the embodiment shown in FIG. 6 (a), and FIG. 12 shows the shaping apparatus 120 in the manufacturing apparatus 110 shown in FIG. It is the principal part expansion schematic diagram seen from MD direction.
This manufacturing apparatus 110 does not include the press apparatus 105 included in the manufacturing apparatus 100 of the absorbent body 4 described above, but instead includes a shaping apparatus 120 for shaping an object into a predetermined shape. Yes. Furthermore, a moisture supply device 121 for supplying moisture such as water to the object to be shaped is provided upstream of the shaping device 120 in the transport direction F. In this embodiment, since the absorbent body 4a does not contain an absorbent polymer, the absorbent material supplied to the suction drum 102 through the transport pipe 101 is mainly opened as shown in FIG. Only the water absorbent fibers 41F. In the manufacturing apparatus 110, the parts other than the configuration different from the manufacturing apparatus 100 have the same configuration as the manufacturing apparatus 100, and thus the same reference numerals are given and detailed description thereof is omitted.

In the present embodiment, the shaping apparatus 120 includes a pair of upper and lower rolls 120a and 120b as shown in FIGS. Of the pair of upper and lower rolls 120a and 120b, the upper roll 120a is a shaping roll, and the deformation guide portions 8a and 9a before forming the compressed regions 84a, 85a, 94a and 95a on the outer peripheral surface thereof. Are provided with a pair of grooves 120a ₁ and 120a ₂ extending in the circumferential direction for shaping the pair of protrusions 311 and 312 into a laminate. The pair of groove portions 120a ₁ and 120a ₂ corresponds to the shape and width in the length direction of the pair of deformation guide portions 8a and 9a at positions corresponding to the positions of the pair of deformation guide portions 8a and 9a in the absorber 4a. It is formed on the outer peripheral surface of the upper roll 120a in a mode having a length direction and a width. On the other hand, the lower roll 120b is an anvil roll with a flat outer peripheral surface. And by passing the laminated body which is an object to be shaped between the pair of rolls 120a and 120b, the pair of protrusions 311 and 312 are respectively provided on one surface (in this case, the upper surface) of the laminated body. It can be shaped. Moreover, this shaping apparatus 120 is comprised so that each roll 120a, 120b can be heated, and can shape | mold while heating the laminated body of a shaping target object.

  When manufacturing the absorbent body 4a using the manufacturing apparatus 110 described above, the first step of forming the first laminated body 411 by laminating the absorbent material mainly composed of only the water absorbent fibers 41F, and the core wrap continuous A second step of forming the second laminated body 413 by covering the first laminated body 411 with the body 412, and the third laminated body by shaping the second laminated body 413 with the shaping device 120 The fourth layer 415 is formed by embossing the third step of forming 414 and pressing the predetermined position of the third stacked body 414 in the TD direction (thickness direction) by the pressing device 106. The fourth step is sequentially performed.

  First, in the first step, since the absorbent material supplied to the suction drum 102 through the transport pipe 101 is mainly the opened water absorbent fibers 41F, the first step formed by this first step is used. The laminated body 411 is composed of water absorbent fibers 41F having a substantially uniform basis weight as a whole. Since the other points are the same as those in the first step of the manufacturing method using the manufacturing apparatus 100 described above, detailed description thereof is omitted. Further, the second step and the fourth step are also the same as the respective steps of the manufacturing method using the manufacturing apparatus 100 described above, and detailed description thereof is omitted.

In the third step, the second laminated body 413 formed in the second step, that is, the first laminated body 411 formed by the water absorbent fibers 41F as shown in FIG. By forming the laminated body in which the (absorbing core) is covered with the core wrap continuous body 412 by the shaping apparatus 120 described above, a third laminated body 414 as shown in FIG. 13B is formed.
More specifically, water is sprayed from the moisture supply device 121 to the second stacked body 413 transported along the transport direction F, and the second stacked body 413 (particularly, the second stacked body 413). After moistening the water absorbent fibers 41F in the laminate 413), the wet second laminate 413 is passed between the heated pair of rolls 120a and 120b of the shaping device 120, and a pair of protrusions 311 and 312 are formed. By passing the wet second laminate 413 between a pair of heated rolls 120a and 120b, adjacent water absorbent fibers 41F in the second laminate 413 are connected by hydrogen bonds. Therefore, the pair of protrusions 311 and 312 formed in accordance with the shape of the pair of grooves 120a ₁ and 120a ₂ in the upper roll 120a is maintained in a substantially unchanged shape. In the third laminated body 414 after shaping, a portion shaped by the portions other than the pair of groove portions 120a ₁ and 120a ₂ becomes a portion 313 corresponding to the base portion 10a of the absorbent body 4a.
In this way, in the third step, the third laminated body 414 in a state in which the pair of protruding portions 311 and 312 and the portion 313 corresponding to the base portion 10a of the absorber 4a are shaped is formed. It will be.

  And by further implementing the same process as each process of the manufacturing method using the above-mentioned manufacturing apparatus 100 with respect to the 3rd laminated body 414 formed at the said 3rd process, Fig.6 (a) The absorber 4a shown in FIG.

In each of the above-described embodiments, the deformation guide portions are provided at positions spaced apart from each other across the width direction central axis extending in the length direction of the absorber. It is not limited to an aspect, Only one deformation | transformation induction | guidance | derivation part may be provided according to a desired deformation | transformation induction | guidance | derivation aspect, and may be provided three or more. Further, the direction in which the deformation guide portion extends (that is, the predetermined direction) is not limited to the length direction of the absorber, and the predetermined direction may be the width direction of the absorber. Further, the shape of the deformation guiding portion in plan view may be different from the shapes shown in FIGS.
As described above, the absorbent article of the present invention is not limited to the above-described embodiments, and can be appropriately combined and changed without departing from the object and spirit of the present invention.

  In addition to the tape-type disposable diaper of the embodiment described above, the present invention can be applied to various absorbent articles such as a pant-type disposable diaper, a light incontinence pad, a panty liner, a sanitary napkin, and the like. it can. In this specification, ordinal numbers such as “first” and “second” are used to distinguish items with the ordinal numbers, and mean the order, priority, importance, etc. of each item. Not what you want.

1 disposable diaper (absorbent article)
2 Top sheet 3 Back sheet 4 Absorber 41F Water absorbent fiber 41S Absorbent polymer 8, 9 Deformation induction part 81, 82, 91, 92 First convex part 83, 93 Second convex part 84, 85, 94, 95 Pressing area 84p, 85p, 94p, 95p Pressing part 84q, 85q, 94q, 95q Non-pressing part 10 Base 11 Recess 12 Base body

Claims (14)

An absorbent article having an absorbent body having a length direction, a width direction, and a thickness direction and including at least a water-absorbing fiber,
The absorber has a deformation guiding portion extending in a predetermined direction, and a base portion extending on both sides of the deformation guiding portion,
The deformation guiding part extends in the predetermined direction, extends in the predetermined direction between the two first convex parts protruding from the base part to the skin surface side, and the two first convex parts, and And extending in the predetermined direction between at least one second convex portion projecting to the skin surface side, and between the first convex portion and the second convex portion, and the absorber in the thickness direction And a compression region including a compressed portion compressed into
The absorbent article, wherein the fiber density of each of the first convex part and the second convex part is lower than the fiber density of the base part.   The predetermined direction is the length direction, and the absorber includes the deformation guide portions at positions spaced apart from each other across a widthwise central axis extending in the length direction of the absorber. Item 10. An absorbent article according to Item 1. The absorbent body is composed of an absorbent core having a length direction, a width direction, and a thickness direction and including at least the water absorbent fiber, and a core wrap that covers an outer peripheral surface of the absorbent core,
The absorption core is a bending guide that connects a portion of a pair of notches provided at symmetrical positions across the widthwise central axis at both ends in the widthwise direction, the portions closest to the widthwise central axis. A plurality of wires are arranged side by side in the length direction,
The deformation guide part is at least the absorption of the plurality of bending guide lines from the bending guide line closest to one end in the length direction of the absorption core of the plurality of bending guide lines. The absorptive article according to claim 2 extended over the bending induction line nearest to the other end of the length direction of a core.   4. The absorbent article according to claim 2, wherein each of the deformation guide parts includes a pattern that protrudes outward with respect to the central axis in the width direction in plan view.   The absorptive article according to any one of claims 1 to 4 whose total width of each squeezing area is 1/2 or less of the width of said deformation induction part in said deformation induction part.   The said compression area | region is equipped with the several pressing part provided intermittently along the said predetermined direction, and the non-squeezing part which exists between the said pressing parts adjacent to the said predetermined direction, The said non-squeezing part The absorbent article as described in any one of Claims 1-5 which protrudes in the skin surface side rather than the said pressing part.   The said absorber contains the absorptive polymer, The basic weight of the said absorptive polymer contained in the said deformation | transformation induction | guidance | derivation part is smaller than the basic weight of the said absorptive polymer contained in the said base part. The absorbent article as described in any one.   The base includes a concave portion that is provided adjacent to the first convex portion and along the first convex portion and that is recessed toward the non-skin surface, and a base main body that is adjacent to the concave portion. The absorbent article as described in any one of Claims 1-7.   The absorber contains an absorbent polymer, and the mass content of the absorbent polymer contained in a portion extending in the thickness direction on the non-skin surface side of the recess is the absorption contained in the base body. The absorbent article according to claim 8, wherein the absorbent article is larger than a mass content of the conductive polymer.   The absorbent article as described in any one of Claims 1-9 whose thickness of a said 2nd convex-shaped part is smaller than the average thickness of the said base.   The absorptive article according to any one of claims 1 to 10 whose width of said 2nd convex part is narrower than the width of said 1st convex part.   The deformation guiding portion includes two or more second convex portions between the two first convex portions, and extends between the second convex portions in the predetermined direction and The absorbent article as described in any one of Claims 1-11 provided with the subcompression area | region which has the pressing part which consolidated the absorber in the said thickness direction. The absorber includes an end-side deformation guide portion that extends in the predetermined direction and is connected to at least one end portion of the deformation guide portion in the predetermined direction;
The end portion side deformation guide portion includes two end side first convex portions extending in the predetermined direction and projecting from the base portion toward the skin surface side, and the two end side first convex portions. An end-side squeezing region that has a squeezed portion that extends in the predetermined direction and has the absorbent body consolidated in the thickness direction,
The fiber density of the end side first convex part is lower than the fiber density of the base part,
The said edge part side pressing area | region is connected with the end of the pressing area | region located in an inward side in the planar view of the said absorbent article among the pressing area | regions of the said deformation | transformation induction | guidance | derivation part. The absorbent article as described in any one. The deformation inducing portion includes, on the non-skin surface side of the absorbent body, two third convex portions protruding from the base portion to the non-skin surface side corresponding to the two first convex portions, and the at least one The squeezing on the skin surface side between at least one fourth convex portion projecting to the non-skin surface side corresponding to the two second convex portions, and between the third convex portion and the fourth convex portion A non-skin-side compressed area having a non-skin-side compressed part corresponding to the part,
The absorbent article as described in any one of Claims 1-13 whose fiber density of each of the said 3rd convex part and the said 4th convex part is lower than the fiber density of the said base.

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