JP4679300B2 - Absorbent of absorbent articles - Google Patents

Description

  The present invention relates to an absorbent body of an absorbent article.

The absorbent body of the disposable diaper has a planar shape in the manufacturing process of the diaper, and is generally formed into a three-dimensional shape by the contracting action of the elastic member of each part when the diaper is used. However, when it becomes a three-dimensional shape, irregular wrinkles may occur in the absorbent body, and the wearing feeling may deteriorate.
In particular, the degree of deterioration of the wearing feeling is large in an absorbent body in which two or more absorbent materials are laminated in order to ensure a sufficient absorption capacity.

  Patent Document 1 describes a disposable diaper in which a bending guide portion is formed on an absorber disposed on the abdomen side of a wearer, and the gazette wears an absorber having a bending guide portion. There is a description of means for closely contacting a person's torso.

JP 2003-275236 A

  However, the diaper described in Patent Document 1 may cause wrinkles in the absorbent body when the absorbent body having the bending guide part is brought into close contact with the body part, and the basis weight of the absorbent material is particularly increased in order to increase the absorption capacity. When it is increased or a plurality of absorbent materials are overlapped, the discomfort due to wrinkles of the absorber becomes large, and a reduction in wearing feeling is inevitable. Moreover, since irregular wrinkles generated in the absorber also lead to a reduction in leakage prevention effect, suppression thereof is required.

  Accordingly, an object of the present invention is to absorb absorbent articles that are less likely to generate irregular wrinkles even when deformed into a three-dimensional shape, and that can improve the wearing feeling while maintaining or improving the absorption capacity. To provide a body.

  The present invention is an absorbent article of an absorbent article that is composed of two or more layers of absorbent material and has a substantially vertically long shape, and is located on the skin contact surface side of the first absorbent material and the first absorbent material. The first absorbent material and the second absorbent material each have a cut portion on both sides in the longitudinal direction, and the first absorbent material cut portion and the second absorbent material The cut portion overlaps at least a part of each to form an opening region for closing, and the layer of the absorbent material extends from the edge of the opening region for closing toward the inside of the absorber perpendicular to the edge. The object is achieved by providing an absorbent article absorbent article, the number of which is increased.

  Even if the absorbent body of the absorbent article of the present invention is deformed into a three-dimensional shape, irregular wrinkles are unlikely to occur, and the wearing feeling can be improved while maintaining or improving the absorption capacity.

Hereinafter, the present invention will be described based on preferred embodiments thereof.
As shown in FIGS. 1 to 3, the absorbent body 4 of the absorbent article of the present embodiment is an absorbent body that is preferably used for disposable diapers, particularly pants-type disposable diapers.
As shown in FIGS. 3 and 4, the absorbent body 4 is made of two or more layers of absorbent material and has a substantially vertically long shape.
The absorbent body 4 includes a first absorbent material 41 and a second absorbent material 46 positioned on the skin contact surface side of the first absorbent material 41 in the thickness direction of the absorbent body 4. The two absorbents 46 have two pairs of cuts 42, 43, 47, 48 on both sides in the longitudinal direction, respectively, and the cuts 42, 43 of the first absorbent 41 and the second absorbent 46. The cut-out portions 47 and 48 overlap with each other at least in part to form the closing opening regions 40 and 45, and the edge portions of the closing opening regions 40 and 45 are perpendicular to the edge portions. The number of layers of the absorbers 41 and 46 increases toward the inside of the absorber. The longitudinal direction of each of the first absorbent material 41 and the second absorbent material 46 is the same as the longitudinal direction of the absorbent body 4 (vertical direction in FIG. 4).

The absorber 4 of this embodiment is demonstrated in detail.
As shown in FIG. 4 (a), the opening regions 40 and 45 for closing in the absorbent body 4 of the present embodiment divide the absorbent body 4 into three parts by dividing the full length L in the longitudinal direction of the absorbent body 4 into the ventral side. When divided into a part 4A, a central part 4C, and a back side part 4B, a pair is formed on the ventral side part 4A and the back side part 4B.
The closing opening regions 40 and 45 formed on one side in the longitudinal direction of the absorber 4 and the closing opening regions 40 and 45 formed on the other side are a center extending in the longitudinal direction of the absorber 4. It is formed symmetrically with respect to the line.

The closing opening region 40 formed on the ventral side portion 4A is a region generally indicated by dotted dots in FIG. 5A, and the cut portion formed in the first absorbent material 41. 42 [see FIG. 4 (b)] and a part of the cut portion 47 [see FIG. 4 (c)] formed in the second absorbent material 46 overlap in the thickness direction of the absorber 4. Is formed. Therefore, neither the first absorbent material 41 nor the second absorbent material 46 exists in the closing opening area 40.
As shown in FIG. 5, the opening area 40 for closing has a pair of opposite edges 401 and 402, and as shown in FIG. 5B, one edge 401 is made of the first absorbent material. The edge part 421 of the notch part is formed, and the other edge part 402 is formed by the edge part 421 of the notch part of the first absorbent material and the edge part 471 of the notch part of the second absorbent material.

  On the one edge 401 side of the opening area 40 for closing, as shown in FIG. 5B, the absorber extends from the edge 401 in a direction perpendicular to the edge 401 (in the plan view of the absorber). The number of layers of the absorbent material is increasing toward the absorber internal direction (the left direction in FIG. 5B) in the direction orthogonal to the direction. That is, the vicinity of the edge portion 401 of the absorbent body 4 is composed only of the first absorbent material 41, but the second absorbent material is disposed at a portion separated from the edge portion 401 in a direction orthogonal to the edge portion 401 by a predetermined width L1. The edge part 471 of 46 is located, and the layer number of an absorber becomes 2 layers beyond it.

The closing opening region 45 formed in the back side portion 4B is a region generally indicated by dotted dots in FIG. 6 (a), and the cut portion formed in the first absorbent material 41. 43 [see FIG. 4B] and a part of the cut portion 48 [see FIG. 4C] formed in the second absorbent material 46 overlap in the thickness direction of the absorber 4. Is formed. Therefore, neither the first absorbent material 41 nor the second absorbent material 46 exists in the closing opening region 45.
As shown in FIG. 6, the opening area 45 for closing has a pair of opposite edges 401 and 402, and as shown in FIG. 6B, each of the edges 401 and 402 has the first absorption. It is formed by the edge part 431 of the notch part of a material. In the opening area 45 for closing, the edge part 481 of the notch part of the 2nd absorbent material is located rather than the position of the edge part 431 of the notch part of the 1st absorbent material in any edge part 401,402 side which opposes. As a result, the number of absorbent layers increases from the edge toward the inside of the absorbent body in the direction perpendicular to the edge on either edge 401, 402 side. ing.

  For example, when the absorbent body 4 of the present embodiment is used by being incorporated in the disposable diaper 1 described above, the diaper 1 is deformed into a three-dimensional shape as shown in FIG. Accordingly, as shown in FIGS. 5 (c) and 6 (c), the opening region 40 for closing the ventral portion 4 </ b> A and the opening region 45 for closing the dorsal side portion B are closed, respectively. Is also transformed into a three-dimensional shape. The term “closure” as used herein includes not only the case where the opening area for closing is completely or almost completely closed, but also the case where the distance between a pair of opposite side edges of the opening area for closing becomes short.

  According to the absorbent body 4 of the present embodiment, since it has the opening areas 40 and 45 for closing, the absorbent body 4 is each opening area for closing or its vicinity by the contracting action of the elastic member arranged on the absorbent article. It bends and easily deforms into a three-dimensional shape. And even if it deform | transforms like that, as shown in FIG.5 (c) and FIG.6 (c), the edge part of the 1st absorber 41 or the 2nd absorber 46 which exists on both sides of the opening area for closure Since they are prevented from colliding with each other, irregular wrinkles can be prevented from occurring in the absorbent body 4, and it is possible to prevent the wearer from feeling uncomfortable. When the edge part of the notch part of the 1st absorber 41 is located in the position retreated from the edge part of the notch part of the 2nd absorber 46, when the absorber 4 deform | transformed into a solid shape Although the edges of the second absorbent material 46 are likely to collide with each other, even if they collide with each other, a portion where the number of layers of the absorbent material is not large will collide, so that it is possible to prevent irregular wrinkles from occurring in the absorbent body 4 and wearers It is possible to prevent the user from feeling uncomfortable.

  The closing opening region in the present invention is formed by cutting the second absorbent material 46 on one or both sides of the pair of edge portions 401 and 402 facing each other like the closing opening regions 40 and 45 in the present embodiment. It is preferable that the edge portion of the insert portion is located at a position retreated from the edge portion of the cut portion of the first absorbent member 41, and a pair of opposing edge portions 401 like the opening region 45 for closing. , 402, it is more preferable that the edge of the cut portion of the second absorbent material 46 is located at a position retracted from the edge of the cut portion of the first absorbent material 41.

  In addition, the closing opening region in the present invention is similar to the closing opening region 45 in the present embodiment, in which both of the pair of opposed edge portions 401 and 402 are edges of the cut portion of the first absorbent material. It is formed by the part 431, or that both of the pair of opposite edge parts 401 and 402 are formed by the edge part of the cut part of the second absorbent material. It is preferable from the viewpoint of prevention.

Further, the closing opening region in the present invention is only one edge 401 side of the pair of facing edges 401 and 402 of the closing opening region, like the closing opening region 40 in the present embodiment. , The position of the edge 421 of the cut portion of the first absorbent material and the position of the edge portion 471 of the cut portion of the second absorbent material are shifted in a direction perpendicular to the edge portion 401 of the opening region for closing. When it exists, it is preferable that the shift | offset | difference width L1 [refer FIG.5 (b)] is 3-20 mm, and it is more preferable that it is 6-15 mm.
On the other hand, as in the opening region 45 for closing in the present embodiment, the cut portion of the first absorbent material is formed on either edge 401 side of the pair of edge portions 401 and 402 facing each other in the opening region for closing. When the position of the edge portion 431 and the position of the edge portion 481 of the cut portion of the second absorbent material are shifted in the direction perpendicular to the respective edge portions 401 and 402 of the closing opening region, the shift width L2 [See FIG. 6B] is preferably 3 to 20 mm, and more preferably 3 to 12 mm.

  When the edge of the cut portion of the second absorbent material is located at a position 3 mm to 20 mm away from the edge of the opening area for closing, it is possible to simultaneously achieve both the closing property of the opening area for closing and the prevention of wrinkles. It becomes easy. By setting it to 3 mm or more, the cut edges of the second absorbent material collide with each other at the time of closing, and it can be surely prevented that wrinkles occur, and by setting it to 20 mm or less, when wearing a diaper or the like, It can prevent that the closing property of the opening area for closure deteriorates.

  In the absorbent body of the present invention, since the absorbent body is composed of two or more layers of absorbent material, it is possible to prevent irregular wrinkles from occurring in the absorbent body while maintaining or improving the absorption capacity. That is, when a cut portion is put in an absorbent body made of a single absorbent material, wrinkles are likely to occur near the cut portion when the absorbent body is made into a three-dimensional shape with an increase in the basis weight. Therefore, a reduction in wearing feeling is inevitable. In the present invention, the absorber is divided into a plurality of layers, the shape of the cut portion in each is changed, and the opening is formed by overlapping them to form a closing opening region, thereby maintaining or improving the absorption capacity. The generation of wrinkles can be suppressed.

In the absorber 4 of this embodiment, it is preferable that the average basic weight of each absorber 41 and 46 is 600 g / m < ² > or less, and the average basic weight of an absorber is 250-700 g / m < ² >.
By setting the average basis weight of each absorbent material 41, 46 to 600 g / m ² or less, wrinkles are generated in the absorbent material when the opening area for closure is closed, and the wrinkles adversely affect the wearing feeling and the like. Can be prevented. The average basis weight of each absorbent material 41, 46 is more preferably 500 g / m ² or less. The lower limit of the average basis weight of each of the absorbent materials 41 and 46 is not particularly limited, but is preferably 60 g / m ² or more, particularly 90 g / m ² or more from the viewpoint of securing the absorption capacity.
When the average basis weight of the absorbent is less than 250 g / m ² , the degree of wrinkles is small and there is little uncomfortable feeling without using the technique of the present invention, but the absorbent has a relatively high absorption capacity as in a disposable diaper. It is difficult to ensure a sufficient absorption capacity for the absorbent body of the article. On the other hand, when the average basis weight of the absorber is 700 g / m ² or less, the absorption capacity can be sufficiently secured, and the closing property of the opening area for closing is reduced due to the decrease in flexibility of the absorber. It can prevent that the adhesiveness to the skin of a body falls. It is more preferable that the average basis weight of the absorber is 350 to 600 g / m ² , since an excellent wearing feeling and adhesion of the absorber to the skin can be easily realized while ensuring a sufficient absorption capacity.

The average basis weight of each absorbent material 41 and 46 is calculated by measuring the area and weight for each absorbent material and dividing the weight by the area.
The average basis weight of the absorber is calculated by dividing the total weight of each absorbent material by the area surrounded by the outer edge of the laminate formed by laminating each absorbent material.

Further, the absorber 4 is such that the average basis weight of the second absorbent material 41 is smaller than the average basis weight of the first absorbent material 47 when the opening regions 40 and 45 for closing are closed. Even if the edges of the nipped portions collide with each other and the wrinkles are generated, the degree is small and it is preferable because inconveniences such as discomfort can be prevented.
Moreover, in order to suppress the degree of wrinkles when the edges of the cut portions of the second absorbent material collide with each other, it is preferable to reduce the rigidity of the second absorbent material. The absorbent material is preferably composed of a fiber composition not containing an absorbent polymer (fiber composition such as pulp, rayon, acetate tow, or a combination thereof).

  Absorbents constituting the absorber include piled fibers of fibers such as pulp fibers, mixed fibers of fibers such as pulp fibers and superabsorbent polymers, or piled articles such as pulp fibers. The thing etc. which spread | dispersed the polymer, etc., or those which included fibers, such as acetate tow, combined with paper, a nonwoven fabric, etc. can be used. The notches 42, 43, 47, and 48 are formed by cutting out a part of the first and second absorbent materials, or stacking a fiber product and a mixed product with a superabsorbent polymer. At this time, it can be formed by preventing fibers and the like from being deposited in a portion corresponding to the cut portion. The absorbent body 4 is formed by stacking a plurality of absorbent materials composed of fiber piles, mixed fibers of fibers and superabsorbent polymers, or the like, and a first absorbent material and a second absorbent material. Other absorbent materials may be included. The absorbent body 4 may be covered with soft thin paper or nonwoven fabric or the like, and such soft thin paper or the like may exist in the opening area for closing, but the absorbent body 4 has irregular wrinkles. From the standpoint of preventing the occurrence, it is preferable that the thin paper or the like is cut out so as to roughly follow the shape of the opening area for closing (if it is not a means for cutting out, it is sufficient if it has such a shape as a result). .

In the absorbent body 4 of the present embodiment, the pair of closing opening regions 40, 40 and the pair of closing opening regions 45, 45 are formed apart from each other in the longitudinal direction of the absorber 4, and FIG. b) and as shown in FIG. 4 (c), the open ends 42a, 43a, 47a, 48a of the notches 42, 43, 47, 48 forming the respective opening regions 40, 40, 45, 45 for closing are Both are directed to one end (end on the back side) 4E side (downward in FIG. 4) of the absorbent body 4 in the longitudinal direction.
By forming all the incisions forming the opening region for closing so that their open ends are directed to either one of the ends in the longitudinal direction of the absorber, the absorber Productivity can be improved, and it can be manufactured relatively easily and inexpensively without requiring significant modification of conventional equipment. If one of the cuts is facing the ventral side and the other is facing the dorsal side, it will be broken into a part of the absorber by wind pressure around the cut part facing the direction of travel during production. Etc. are likely to occur, which may lead to a decrease in production efficiency.

The absorbent body 4 of the present embodiment is used by being incorporated in the disposable diaper 1 as shown in FIGS. In the state of being incorporated in the disposable diaper 1, the opening area 45 for closing of the absorbent body 4 is located at a site that abuts near the wearer's buttocks, and the opening area 40 for closing closes the abdomen of the wearer. It is located in the part which touches.
Since the wearer's buttocks or near the abdomen is a region with a large curvature in the wearer's torso direction, irregular wrinkles are generated in the absorbent when the absorbent is intended to follow the wearer's skin. Cheap. By forming the opening area for closing on the ventral side 4A or the back side 4B of the absorbent body 4, especially both of them, the wrinkle of the absorbent body is prevented and the wearing feeling when wearing the diaper is effectively improved. Can be made.

From the viewpoint of deforming the absorbent body 4 into a curved shape along the skin shape of the lower leg or the lower abdomen, the opening region 40 for closing the ventral portion 4A prevents irregular wrinkles. Of the angles formed by the direction center line L40 and the longitudinal center line of the absorber 4 or the straight line L4 parallel thereto, the acute angle θ1 (see FIG. 5A) is preferably 5 to 30 °. More preferably, it is 5 to 20 °.
From the viewpoint of deforming the absorbent body 4 into a curved shape along the skin surface shape of the leg circumference or the buttock while preventing the occurrence of irregular wrinkles, the opening area 45 for closing the back side part 4B has its longitudinal direction. Of the angles formed by the center line L45 and the longitudinal center line of the absorber 4 or the straight line L4 parallel thereto, the acute angle θ2 (see FIG. 6A) is preferably 30 to 80 °, more preferably. Is 30-60 °.
Considering the difference between the shape of the buttocks and the abdomen, the value of the angle θ2 of the opening area 45 for closing the back side part 4B is used for closing the abdominal side part 4A from the viewpoint of improving the fit of the absorber and improving the wearing feeling. It is preferable that the opening area 40 is larger than the value of the angle θ1.
As shown in FIG. 6A, the longitudinal center line of the closing opening region has an apex angle vertex 403 on the tip point P in the depth direction of the notch of the closing opening region, and for closing. The isosceles as large as possible, having apex 404, 405 of the base angle on each of the pair of opposite edges 401, 402 of the opening region, and each of the pair of edges 401, 402 does not intersect with two equal sides When a triangle is assumed, a straight line that divides the apex angle into two equal parts. When there are a plurality of longitudinal centerlines of the opening area for closing, measurement is performed for each. When the vicinity of the tip in the depth direction of the opening of the closing opening region is not a curve but a straight line, a center line in the longitudinal direction is drawn with the point that bisects the length of the line forming the straight line as the tip point P .

The length of the opening area 40 for closing the ventral portion 4A is from the viewpoint of deforming the absorbent body 4 into a curved shape along the skin surface shape of the legs or the lower abdomen while preventing irregular wrinkles. It is preferable that it is 10-100 mm, More preferably, it is 15-50 mm.
The length of the closing opening region 45 of the back side portion 4B is 20 from the viewpoint of deforming the absorber 4 into a curved shape along the skin surface shape of the leg periphery or the buttock while preventing the occurrence of irregular wrinkles. It is preferable that it is -120mm, More preferably, it is 20-70mm.
The length of each closing opening area is the distance between the apex and base sides (sides having base angles at both ends) of the isosceles triangle when the above-mentioned isosceles triangle is assumed for each closing opening area. Distance.

Further, the opening area 45 for closing the back side portion 4B has less wrinkles when the area is closed, so that the width gradually increases toward the tip point P in the depth direction of the cut portion of the area. The shape is preferably reduced, and particularly in the present embodiment, it is preferably substantially U-shaped or V-shaped in plan view. The same applies to the closing opening region 40 of the ventral portion 4A. The opening area 45 for closing the back side portion 4B is an open end side from the viewpoint of deforming the absorber 4 into a curved shape along the skin shape of the leg circumference or the buttock while preventing the occurrence of irregular wrinkles. Is preferably 10 to 100 mm, more preferably 20 to 60 mm.
The opening width on the open end side is the length of the base of the isosceles triangle (side having base angles at both ends) when the above-mentioned isosceles triangle is assumed for each closing opening region.

The disposable diaper 1 shown in FIGS. 1-3 is demonstrated.
The disposable diaper 1 is a pants-type disposable diaper as shown in FIGS. 1 to 3, and as shown in FIG. 3, the liquid-permeable top sheet 2, the liquid-impermeable or water-repellent back sheet 3 and the above-mentioned. The absorbent body 4 is provided.
As shown in FIG. 2, the diaper 1 can be divided into a crotch region C disposed in the crotch part, and a ventral region A and a dorsal region B positioned in front and rear thereof. Further, as shown in FIG. 2, the present diaper 1 can be divided into a front body F and a back body G with a diaper center line CL extending in the lateral direction of the diaper as a boundary. The diaper 1 has a pair of side joints 23 and 23, a waist opening 5 and a pair of leg openings by joining the side edges A1 and A1 of the ventral side A and the side edges B1 and B1 of the back side B. Portions 6 and 6 are formed.

  As shown in FIGS. 2 and 3, the diaper 1 is located on the outer surface of the absorbent main body 10 and the outer surface of the absorbent main body 10 (surface facing away from the wearer). The outer package 20 is fixed. The absorptive main body 10 includes a top sheet 2, a back sheet 3, an absorbent body 4 sandwiched and fixed between the two sheets, and a pair of three-dimensional guards 11 each having a thread-like elastic member 11a disposed at a free end. As shown in FIG. 3, the outer package 20 includes at least two sheets, that is, an outer layer sheet 21 forming an outer surface of the diaper 1 (a surface facing away from the wearer), and the outer layer sheet. 21 and an inner layer sheet 22 laminated and adhered to the inside thereof, and elastic members 51, 61, 62, 71, 72 of each part to be described later are made of hot melt adhesive or the like between these sheets. It is fixed in an extended state using an adhesive.

  As shown in FIG. 2, waist elastic members 51 are disposed in the stretched state along the diaper lateral direction in the vicinity of the waist openings 5A and 5B of the front body F and the back body G, respectively. The waist elastic member 51 forms a waist gather substantially around the entire circumference of the waist opening 5.

  Further, the diaper lateral center line CL side (the lower side in the state shown in FIG. 1) on the diaper lateral center line CL side than the waist elastic members 51 of the front body F and the back body G of the diaper 1 than at both ends in the diaper width direction. The front body curved elastic member 71 and the back body curved elastic member 72 are arranged so as to be approximated to the diaper lateral center line CL on the diaper width direction central portion side. The front body curved elastic member 71 and the back body curved elastic member 72 in the diaper 1 are each arranged in a state of being divided in the diaper width direction, and substantially overlap with the central portion in the width direction of the absorbent body 4. Does not exist.

  Moreover, the 1st and 2nd leg elastic members 61 and 62 are distribute | arranged to each leg part 60 which is a site | part distribute | arranged around a wearer's leg in the diaper 1. As shown in FIG. These leg elastic members 61 and 62 overlap or are close to each other in the crotch region, and by these elastic members, substantially the entire circumference of each leg opening 6 is substantially overlapped with each other. A continuous leg gather is formed.

In the absorbent body 4 in the state of being incorporated in the diaper 1, the ventral part 4 </ b> A is located in the front body F and the back part 4 </ b> B is located in the back body G. When the diaper 1 has a three-dimensional shape as shown in FIG. 1, the opening area 40 for closing the ventral side 4A is closed mainly by the contracting action of the elastic members 71 and 61 described above, and the back side 4B The opening area 45 for closing is mainly closed by the contracting action of the elastic members 72 and 62 described above.
Thus, it is preferable that the absorber 4 is used so that each closing opening area | regions 40 and 45 are closed by the contraction effect | action of the elastic member distribute | arranged to the absorbent article in which the absorber 4 is integrated. In addition, as a forming material of the elastic members 51, 61, 62, 71, 72, 71, 72 of the absorbent body 4, various known elastic materials used for disposable diapers and the like can be used. -A wide range of elastic materials such as synthetic rubber such as butadiene, butadiene, isoprene, neoprene, natural rubber, EVA, elastic polyolefin, urethane, etc., for example, the shape is rectangular, square, circular, polygonal A shape, a multifilament type, etc. can be used such as a thread shape, a string shape, or a belt shape.

As mentioned above, although preferable embodiment of this invention was described, this invention is not restrict | limited to embodiment mentioned above.
For example, the absorbent body of the absorbent article of the present invention can be used as an absorbent body of various absorbent articles used in contact with human skin, in addition to pants-type diapers for adults or infants, So-called unfolded (tape-clamped) disposable diapers, auxiliary absorbent pads, incontinence pads, sanitary napkins, panty liners (origami sheets), breast milk placed on the skin contact surface of disposable diapers It can also be used as a pad absorber.

  Moreover, the number of layers of the absorbent material constituting the absorber may be three or more. In this case, the first absorbent material is the lowermost absorbent material farthest from the skin contact surface side of the absorbent article, and the second absorbent material is adjacent to the first absorbent material and overlaps the first absorbent material. The absorber is the third absorbent material and the fourth absorber in order from the third layer. When there are three or more absorbent layers, the shape of the cut portion is different in all layers (for example, the third layer and the fourth layer have the same shape and do not overlap completely), and the opening area for closing It is preferable from the viewpoint of reducing wrinkles of the absorbent body that the number of layers of the absorbent material is increased stepwise as one moves away from the edge at one or both of the pair of opposite edges.

Moreover, although the absorber 4 of embodiment mentioned above had the opening area | regions 40 and 45 for closure in both the ventral | abdominal side part 4A and the back | dorsal side part 4B, it has a closing opening area | region only in any one. It may be. Moreover, the position of the edge part of a 2nd notch part from the edge part of the notch part of a 1st absorbent material in each side of a pair of edge part which opposes like the opening area 45 for closure in embodiment mentioned above. 7, the position of the edge portion of the second cut portion 46 is moved backward from the edge portion of the cut portion of the first absorbent material 41 on the one edge portion 401 side, as shown in FIG. 7. In addition, on the other edge side 402, the position of the edge of the cut portion of the first absorbent material 41 may be set backward from the edge of the cut portion of the second absorbent material 46.
From the viewpoint of deforming the absorbent body 4 into a curved shape along the skin shape of the lower abdomen or the buttocks while preventing the occurrence of irregular wrinkles, the opening area for closing is also provided at the longitudinal end of the absorbent body 4. It is preferable to form, and it is preferable to form at least the end 4E on the back side of the absorber 4.

FIG. 1 is a perspective view showing a state in which a pants-type diaper incorporating an absorbent body as an embodiment of the present invention is viewed from the front body side. FIG. 2 is a plan view showing a developed and extended state of the pant-type diaper of FIG. 3 is a cross-sectional view taken along the line XX of FIG. FIG. 4 is a view showing an absorbent body as an embodiment of the present invention, FIG. 4 (a) is a plan view showing a state seen from the second absorbent material side, and FIG. 4 (b) is a second view. FIG. 4C is a plan view showing only the first absorbent material, and FIG. 4C is a plan view showing only the first absorbent material. It is a figure which shows the detail of the opening area | region for closure formed in the ventral | abdominal side part of the absorber shown in FIG. 4, FIG. 5 (a) is a top view which expands and shows a part of FIG. 4, FIG. ) Is a cross-sectional view taken along the line II-II in FIG. 5A, and FIG. 5C is a view corresponding to FIG. 5B showing a state where the opening region for closing is closed. FIG. 6 is a diagram showing details of an opening region for closing formed on the back side portion of the absorbent body shown in FIG. 4, and FIG. 6A is a plan view showing a part of FIG. 4 in an enlarged manner, FIG. ) Is a cross-sectional view taken along line III-III in FIG. 6A, and FIG. 6C is a view corresponding to FIG. 6B showing a state in which the opening region for closing is closed. It is a figure which shows the absorber as other embodiment of this invention, and is a figure which shows only the back | dorsal side part and its vicinity part of an absorber.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pants type diaper 2 Top sheet 3 Back sheet 4 Absorber 4A Abdominal side part 4B Back side part 4C Center part 40,45 Opening area for closure 41 First absorbent material 42,43 Cut part of first absorbent material 46 Second Absorbent material 47, 48 Cut portion 401, 402 of the second absorbent material A pair of opposing edges of the closing opening region 5 Waist opening portion 51 Waist elastic member A Abdominal region B Back region C Inseam region F Front body G back body

Claims (7)

It is an absorbent body of an absorbent article comprising two or more layers of absorbent material and having a substantially vertically long shape,
A first absorbent material and a second absorbent material located adjacent to the first absorbent material and located closer to the skin contact surface than the first absorbent material, each of the first absorbent material and the second absorbent material being longitudinal A cut portion on both sides of the direction, and the cut portion of the first absorbent material and the cut portion of the second absorbent material overlap each other at least in part to form an opening region for closure,
On one or both sides of a pair of opposing edges of the closing opening region, the direction approaching the closing opening region in the direction perpendicular to the edge is the front, and the direction away from the closing opening region is the rear when present in the edge of the cut portion of the second absorbent material is recessed from the edge of the cut portion of the first absorbent material located, perpendicular to said edges from the edge of the closure opening region Absorber for absorbent articles, wherein the number of layers of absorbent material increases toward the interior of the absorbent body in the direction. The absorbent body of an absorbent article according to claim 1, wherein the average basis weight of each absorbent material is 600 g / m ² or less, and the average basis weight of the absorbent body is 250 to 700 g / m ² .   3. Both of a pair of opposing edge parts of the opening area | region for closure are formed of the edge part of the notch part of a 1st absorbent material, or the edge part of the notch part of a 2nd absorbent material. Absorbent body of absorbent articles.   A position in which at least one of the pair of opposing edges of the opening area for closing is formed by the edge of the cut part of the first absorbent material and is 3 to 20 mm away from the one edge of the opening area for closing The absorbent body of an absorbent article according to any one of claims 1 to 3, wherein an edge portion of the cut portion of the second absorbent material is located at the top.   Closing opening regions are formed at a plurality of locations spaced in the longitudinal direction of the absorber, and the open ends of the first and second cut portions that form the respective closing opening regions are both longitudinal of the absorber. The absorbent body of an absorbent article according to any one of claims 1 to 4, which faces one end side in the direction.   It is an absorbent body of a disposable diaper, and the absorbent body is divided into an abdominal part, a central part and a dorsal part by dividing the entire length in the longitudinal direction into three equal parts, and The absorbent body for absorbent articles according to any one of claims 1 to 5, wherein an opening region for closing is formed.   The absorbent article which comprises the absorber of the absorbent article in any one of Claims 1-6.

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