JP6714444B2 - Disposable diapers - Google Patents

Description

The present invention relates to absorbent articles such as disposable diapers.

A typical form of the absorbent article includes a liquid-permeable top sheet, a liquid-impermeable back sheet, and a vertically long absorber disposed between the both sheets. Further, as the absorbent body, it is known that the absorbent body is configured to include a liquid-retaining absorbent core containing wood pulp or a water-absorbing polymer, and a water-permeable core wrap sheet that coats the absorbent core. There is. The core wrap sheet acts as a sheet for receiving an absorbent core forming material such as a water-absorbent polymer at the time of manufacturing the absorbent body, and plays a role of wrapping the absorbent core and shaping it after the manufacturing.

Further, in an absorbent article, conventionally, for various purposes, it is possible to form a through hole that penetrates the absorbent core in the thickness direction, that is, a non-fiber-laden portion in which the absorbent core-forming material is not fiber-laid. It is being appreciated. For example, Patent Document 1 describes that a plurality of through holes are individually arranged and formed in the absorbent core for the purpose of improving air permeability, and the shape of the through holes is maintained and the through holes are formed. It is also described that upper and lower core wrap sheets that cover the absorbent core are joined to each other on the side wall surface of the through hole for the purpose of preventing scattering of the absorbent core forming material in the hole.

Further, in Patent Document 2, in view of the fact that the position of the absorber shifts between the topsheet and the backsheet or the absorber undergoes unintended deformation due to the movement of the wearer while wearing the absorbent article. For the purpose of solving such a problem, it is described that a plurality of through holes are individually arranged and formed in an absorber, and a top sheet and a back sheet are joined at each of the through holes. Further, Patent Document 3 describes that a through hole extending in the longitudinal direction of the diaper is formed in the absorbent core of the disposable diaper for the purpose of improving the liquid diffusibility, and the surface of each of the through holes is a surface. Joining the sheet and the backsheet is also described.

JP, 2010-233597, A Japanese Unexamined Patent Publication No. 9-51913 JP, 9-99008, A

In the absorbent body, the absorbent core and the core wrap sheet that covers the absorbent core are usually bonded to each other with an adhesive to maintain the shape retention of the absorbent body. When excreted liquid such as urine is absorbed, the liquid may infiltrate into the joint to reduce the joint strength, which may cause the absorbent core to slip on the core wrap sheet. In such a state, when a part of the absorbent core is cracked by the movement of the wearer's legs, the weight of the absorbent core may be increased due to liquid absorption, and the cracked part may absorb the absorbent core. The core is divided, and the portion located closer to the wearer's crotch than the cracked portion, that is, the portion located below the cracked portion when worn, slides down into the crotch due to its own weight, and the absorber is broken. A technique capable of effectively suppressing a decrease in shape retention of the absorbent body while wearing such an absorbent article has not been provided yet.

Therefore, an object of the present invention is to provide an absorbent article which has excellent shape retention of the absorbent body and is less likely to be broken during wearing.

The present invention is provided with an absorber, has a longitudinal direction extending from the abdominal side of the wearer to the back side through the crotch part and a lateral direction orthogonal to the longitudinal direction, and is a crotch part arranged in the crotch part when worn. An absorbent article having a ventral side portion disposed on the wearer's ventral side with respect to the crotch portion and a back side portion disposed on the wearer's back side with respect to the crotch portion in the longitudinal direction. The absorbent body has a liquid-retaining absorbent core, a skin-side core wrap sheet that covers the skin-facing surface of the absorbent core, and a non-skin-side core wrap that covers the non-skin-facing surface of the absorbent core. A plurality of non-fiber-fabricated portions each of which is configured to include a sheet and which penetrates the absorptive core in the thickness direction are independently arranged and formed in the absorbent core, and the skin-side core in each of the non-fiber-fabricated portions. A wrap sheet and the non-skin side core wrap sheet are joined together, and all of the projected images formed when the plurality of non-productive portions are vertically projected toward the longitudinal end of the absorbent core. However, the present invention provides an absorbent article in which the minimum width portion of the crotch of the absorbent core, which is the minimum lateral length portion in the crotch portion, is connected to each other.

ADVANTAGE OF THE INVENTION According to this invention, the absorbent article which is excellent in the shape retention property of an absorber, and an absorber is hard to be broken during wearing is provided.

FIG. 1 shows a surface sheet side of a disposable diaper as an embodiment of an absorbent article of the present invention in a developed state in which elastic members of respective parts are expanded and spread in a plane, that is, a partially broken plane on the skin-facing surface side. It is a figure. FIG. 2 is a schematic cross-sectional view taken along the line I-I of FIG. 1 (the site where the non-fiber-laden portion exists). FIG. 3 is a plan view schematically showing a partially cut-away skin-facing surface of the absorbent body, that is, the absorbent core and the core wrap sheet arranged in the diaper shown in FIG. 1. FIG. 4 is formed in the crotch minimum width part of the absorbent core when the plurality of non-fiber-laden parts in the absorbent core shown in FIG. 1 are projected in the vertical direction toward the longitudinal ends of the absorbent core. It is a figure which shows typically the projected image. FIG. 5: is FIG. 3 equivalent figure of other embodiment of the absorber which concerns on the absorbent article of this invention. FIG. 6 is a view corresponding to FIG. 3 of the absorber used in Comparative Example 2. FIG. 7 is an explanatory diagram of the center-to-center distance between the maximum inscribed circles of the non-stacked fiber portion according to the present invention.

Hereinafter, an absorbent article of the present invention will be described based on a preferred embodiment of a disposable diaper with reference to the drawings. As shown in FIG. 1, the disposable diaper 1 of the present embodiment has a vertical direction X extending from the abdominal side of the wearer to the back side through the crotch portion and a lateral direction Y orthogonal to the vertical direction X, and when worn, A crotch part 1M arranged in the crotch part, an abdominal part 1F arranged on the wearer's abdomen side than the crotch part 1M, and a back part 1R arranged on the wearer's back side from the crotch part 1M. In the vertical direction X. The crotch portion 1M includes a not-shown excretion portion facing portion that is disposed so as to face a wearer's excretion portion (for example, a penis) when worn. The excretion part facing portion is usually located at a position slightly offset from the center of the diaper 1 in the longitudinal direction X to the abdominal side portion 1F.

The diaper 1 is a so-called deployable disposable diaper, and as shown in FIGS. 1 and 2, a liquid-retaining absorbent body 4 and a skin-facing surface side of the absorbent body 4, which are worn by the wearer when worn. It comprises a liquid-permeable topsheet 2 that can come into contact with the skin, and a liquid-impermeable or water-repellent backsheet 3 disposed on the non-skin-facing surface side of the absorber 4. The absorber 4 is interposed between the sheets 2 and 3, and has a shape that is long in the vertical direction X in a plan view as shown in FIG. 1 and is vertically long. The diaper 1 has a center portion in the vertical direction X including the crotch portion 1M, in which both side edges along the vertical direction X are curved in an inward arc shape, and in the plan view as shown in FIG. The part is in the shape of an hourglass that is confined inward.

In the present specification, the “skin-facing surface” is a surface of the absorbent article or its constituent members (for example, the absorbent body 4) that faces the skin side of the wearer when the absorbent article is worn, that is, relatively worn. The side closer to the person's skin, and the "non-skin facing surface" is the side of the absorbent article or its constituent member that is opposite to the skin side when the absorbent article is worn, that is, the side relatively far from the wearer's skin. Is the side facing. Further, in the present specification, "when worn" means a state in which a normal proper wearing position, that is, a correct wearing position of the absorbent article is maintained, and the absorbent article is in a state displaced from the wearing position. The case is not included.

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

Between the top sheet 2 and the back sheet 3 at the waist portions of the abdominal side portion 1F and the back side portion 1R, that is, at the end portions in the vertical direction X, a thread-shaped elastic member 31 extends in the lateral direction Y. The waist gather is formed by the contraction of the elastic member 31 at the waist when the diaper 1 is worn. Further, side sheets 34 are arranged on the left and right sides of the diaper 1 on the side of the topsheet 2 in the vertical direction X, respectively. The side seat 34 has an inner edge portion along the vertical direction X and an outer edge portion that is located outward of the inner edge portion in the lateral direction Y and extends along the vertical direction X, and has a flat surface as shown in FIG. As viewed, the inner edge portion overlaps with the absorber 4, and the outer edge portion extends outward in the lateral direction Y from a side edge of the absorber 4 along the longitudinal direction X and is joined to the backsheet 3. A thread-shaped elastic member 32 is fixed in an elongated state along the longitudinal direction X between the side sheet 34 and the back sheet 3 in the left and right leg portions arranged around the wearer's legs, and thus, When the diaper 1 is worn, a pair of leg gathers are formed by contraction of the elastic member 32 when the diaper 1 is worn. In addition, a thread-shaped elastic member 33 is fixed to the inner edge of the side seat 34 in a stretched state along the longitudinal direction X, so that when the diaper 1 is worn, at least the crotch portion 1M due to the elastic member 33 contracting. A three-dimensional gather is formed on. The topsheet 2, the backsheet 3, the absorber 4, the elastic members 31, 32, 33, and the side sheets 34 are joined to each other by a known joining means such as a hot-melt adhesive.

As shown in FIG. 1, a pair of fastening tapes 35, 35 are provided on both side edges of the back side portion 1R of the diaper 1 along the longitudinal direction X. A fastening portion (not shown) made of a male member of a mechanical surface fastener is attached to the fastening tape 35. Further, a non-skin facing surface of the ventral side portion 1F of the diaper 1 is provided with a to-be-attached area 36 made of a female member of a mechanical surface fastener. The fastened region 36 is formed on the non-skin facing surface of the back sheet 3 forming the non-skin facing surface of the ventral side portion 1F by a known joining means such as an adhesive or heat seal with a female member of a mechanical surface fastener. It is formed by joining and fixing, and the fastening portion of the fastening tape 35 can be detachably fastened.

The absorbent body 4 includes a liquid-retaining absorbent core 40, a skin-side core wrap sheet 41 that covers the skin-facing surface of the absorbent core 40, and a non-skin that covers the non-skin-facing surface of the absorbent core 40. The side core wrap sheet 42 is included. The absorbent core 40 has a single-layer structure, and in a plan view as shown in FIG. 1, the center portion in the vertical direction X has an hourglass shape inwardly constricted, and has a long shape in the vertical direction X. The absorbent core 40 has a ventral side longitudinal end 40F on the ventral side portion 1F and a back side longitudinal direction end 40R on the back side portion 1R, and extends over the entire length of the crotch portion 1M in the longitudinal direction X. The absorbent core 40 has an inseam minimum width portion 40S which is a portion of the crotch portion 1M having a minimum length (that is, width) in the lateral direction Y. The excretion portion facing portion is usually located at or near the crotch minimum width portion 40S.

The absorptive core 40 is formed by stacking core forming materials containing an absorptive material. As the absorbent material, those usually used as a material for forming this type of absorbent core can be used without particular limitation. Polymer particles. That is, the absorbent core 40 may be a fiber-laid product of hydrophilic fibers or a water-absorbent polymer particle supported on the product.

The thickness of the absorbent core 40 under no load (the thickness of the portion other than the non-fiber-laden portion 5 described later) is not particularly limited, but is preferably 2 mm or more, more preferably 3 mm or more, and preferably 15 mm or less, It is preferably 10 mm or less, more specifically, 2 mm or more and 15 mm or less, and further preferably 3 mm or more and 10 mm or less.
The basis weight of the absorbent core 40 is preferably 100 g/m ² or more, more preferably 300 g/m ² or more, and preferably 1000 g/m ² or less, more preferably 600 g/m ² or less, and more specifically. , Preferably 100 g/m ² or more and 1000 g/m ² or less, more preferably 300 g/m ² or more and 600 g/m ² or less.

As the core wrap sheets 41 and 42, for example, paper, non-woven fabric or the like can be used. An example of the non-woven fabric is a hydrophilic non-woven fabric made of fibers that have been subjected to a hydrophilization treatment. Nonwoven fabric has higher strength than paper and does not easily break during processing, and when water-absorbent polymer particles are used as the core-forming material that constitutes the absorbent core, absorbability due to swelling of the water-absorbent polymer particles Nonwoven fabric is preferably used as the core wrap sheets 41 and 42 because it can flexibly cope with the deformation of the core.

The skin-side core wrap sheet 41 and the non-skin side core wrap sheet 42 may be 1) one continuous sheet or 2) separate sheets. In the case of the above 1), for example, one continuous core wrap sheet having a width of 2 times or more and 3 times or less of the length (that is, width) of the absorbent core 40 in the lateral direction Y can be used. This one core wrap sheet covers, for example, the entire skin-facing surface of the absorbent core 40, and extends outward in the lateral direction Y from both side edges of the absorbent core 40 along the longitudinal direction X, and its extension. The projecting portion may be wound under the absorbent core 40 to cover the entire non-skin-facing surface of the absorbent core 40. In that case, in this one core wrap sheet, the portion that covers the skin-facing surface of the absorbent core 40 is the skin-side core wrap sheet 41, and the portion that covers the non-skin-facing surface of the absorbent core 40 is the non-skin-side core. It is the wrap sheet 42.

In the case of 2), the skin side core wrap sheet 41 and the non-skin side core wrap sheet 42 may have the same length (that is, width) in the lateral direction Y or may have different lengths. If the widths of the two sheets 41 and 42 are different, either one may be longer. For example, the skin side core wrap sheet 41 has the same width as the maximum width of the skin facing surface of the absorbent core 40, that is, has a size capable of covering the entire skin facing surface of the absorbent core 40. The skin-side core wrap sheet 42 can be wider than the sheet 41. The wide non-skin side core wrap sheet 42 covers the entire non-skin facing surface of the absorbent core 40, and extends outward in the lateral direction Y from both side edges of the absorbent core 40 along the longitudinal direction X. The extended portion may be wound up on the skin-side core wrap sheet 41 arranged opposite to the skin-facing surface of the absorbent core 40, and may cover both side edges of the sheet 41 along the longitudinal direction X. ..

As shown in FIG. 1, in the absorbent core 40, a plurality of non-fiber-fabricated portions 5A to 5E that penetrate the absorbent core 40 in the thickness direction are individually arranged and formed. More specifically, in the absorbent core 40, nine non-fiber-fabricated portions 5 each having a circular shape in plan view, which are formed of through-holes, are arranged in a scattered manner, and the nine non-fiber-fabricated portions 5 are formed. , Each of which is surrounded by the core forming material forming the absorbent core 40 and is not connected to each other.

In FIG. 3, the skin-facing surface of the absorber 4, that is, the surface facing the topsheet 2 is shown enlarged. As shown in FIG. 3, in the absorbent core 40, the non-fiber-stacking portions 5A, 5B, 5C, 5D, 5E are arranged in this order in the vertical direction from the ventral side longitudinal end 40F to the back side longitudinal end 40R. It is formed intermittently in X, the non-spun portion 5A is in the ventral side portion 1F, the non-spun portion 5E is in the back side portion 1R, and the non-spun portions 5B, 5C, 5D are in the crotch portion 1M, respectively. There is. The non-fiber-fabricated portions 5A, 5B, 5D, 5E other than the non-fiber-fabricated portion 5C are symmetrical with respect to the vertical center line Lx that divides the absorbent core 40 into the horizontal direction Y and extends in the vertical direction X. Are formed, and there are a pair of each. Only one non-stacked portion 5C exists on the vertical center line Lx in the crotch minimum width portion 40S. Further, the size of the non-fiber-laden portion in plan view, that is, the opening diameter of the non-fiber-laden portion is the same in the non-fiber-laden portions 5A, 5C, and 5E, and the same in the non-fiber-laden portions 5B and 5D. Further, the non-fiber-stacked portions 5A, 5C, 5E are larger than the non-fiber-stacked portions 5B, 5D. That is, in the absorbent body 4, the non-fiber-fabricated portions 5A, 5C, 5E having a relatively large opening diameter and the non-fiber-fabricated portions 5B, 5D having a relatively small opening diameter are alternately arranged in the vertical direction X. Has been done.

In addition, the opening diameter of the non-textile portion means the length of the non-textile portion formed of the through hole in a plan view. More specifically, the opening diameter of the non-fiber-fabricated portion is equal to the diameter of the maximum inscribed circle of the non-fiber-fabricated portion in plan view. The maximum inscribed circle here means the largest diameter of the perfect circles that do not protrude from the non-fiber-stacking portion in plan view. For example, when the non-fiber-stacking portion has a circular shape in plan view like the non-fiber-stacking portions 5A to 5E shown in FIG. 1, the non-fiber-stacking portion and the maximum inscribed circle thereof are completely coincident with each other. The opening diameter of the fiber portion is equal to the diameter of the non-fiber portion. In addition, the present invention includes a non-fiber-laden portion having a shape other than a circular shape in plan view. For example, in the case where the non-fiber-laden portion has a square shape in plan view, the maximum inside of the non-fiber-laden portion is Since the diameter of the tangent circle is equal to the length of one side of the non-fiber-laden portion, the opening diameter of the non-fiber-laden portion is equal to the length of the one side of the non-fiber-laden portion. Further, when the shape of the non-textile portion in a plan view is a rectangular shape, the diameter of the maximum inscribed circle of the non-textile portion is equal to the length of the short side of the non-textile portion, so the opening diameter of the non-textile portion is It is equal to the length of the short side of the non-stacked portion.

The non-fiber-laying portions 5A to 5E in the absorber 4 are arranged in a staggered pattern. As used herein, the "staggered arrangement" means that, as shown in FIG. 3, virtual straight lines extending in the vertical direction X through the centers of the plurality of non-fiber-fabricated portions 5A to 5E are arranged at predetermined intervals in the horizontal direction Y. A plurality of adjacent non-textile portions are displaced from each other by two virtual straight lines adjacent to each other, that is, the positions of the non-textile portions in the vertical direction X do not match. In FIG. 3, a plurality of straight lines denoted by reference numerals 51 to 56 are the virtual straight lines, and one of the pair of non-fiber-fabricating portions 5B and 5B and one of the pair of non-fiber-fabricating portions 5E and 5E are in the lateral direction Y. Since the positions match, the virtual straight line 51 is shared, and the other of the pair of non-fiber-stacking parts 5B and 5B and the other of the pair of non-fiber-stacking parts 5E and 5E are positioned in the lateral direction Y. Since they match, the virtual straight line 56 is shared. For example, the imaginary straight line 51 and the imaginary straight line 52 are adjacent to each other, but the non-stacked fiber portions 5B and 5E on the virtual straight line 51 and the non-stacked fiber portion 5A on the virtual straight line 52 are deviated from each other. The positions in the vertical direction X do not match.

The non-laden fiber portions 5A to 5E are portions formed by intentionally hindering the fiber lapping of the core forming material in the fiber laminating step of the core forming material such as wood pulp during the production of the absorbent core 40. The absorbent core 40 having the non-fiber-fabricated portions 5A to 5E can be manufactured according to a conventionally known manufacturing method of an absorbent core. For example, the core forming material supplied by being placed on an air flow is applied to the outer peripheral surface of the rotating drum. In the method for obtaining the absorbent core 40 by suctioning and depositing it on the molding die formed on the mold, a molding die having a predetermined pattern, for example, a portion corresponding to the non-fiber-laden portion 5 is compared with a peripheral portion. It can be manufactured by using a mold protruding upward. In the absorbent core 40 obtained by such a method, the portions where the core forming material does not exist are the non-fiber-fabricated portions 5A to 5E. As another method of manufacturing the absorbent core 40 having the non-fiber-fabricated portions 5A to 5E, an absorbent core having no non-fiber-fabricated portions is manufactured, and a die-cutting process is performed at a predetermined portion of the absorbent core. It is also possible to employ a method in which post-processing such as cutting processing is performed to form the non-fiber-laid portion.

As shown in FIG. 2, in the non-fiber-laden portion 5C, the skin side core wrap sheet 41 and the non-skin side core wrap sheet 42 are joined. Although not shown, both sheets 41 and 42 are also joined in the other non-fiber-laying portions 5A, 5B, 5D and 5E. With such a configuration, the adhesiveness between the absorbent core 40 and the sheets 41, 42 is improved, so that the shape retention of the absorbent core 40 interposed between the sheets 41, 42 is improved, and the absorbent core is improved. Even if the absorbent material such as the water-absorbent polymer particles contained in the core-forming material forming the absorbent core 40 swells by absorbing excretory liquid such as urine, the degree of deformation of the absorbent core 40 is suppressed. In addition, the skin side core wrap sheet 41 is joined to the top sheet 2 with an adhesive, and the non-skin side core wrap sheet 42 is joined to the back sheet 3 with an adhesive. Since the movement of the absorber 4 is restricted, it is difficult for the absorber 4 to move with respect to the topsheet 2 and the backsheet 3 while wearing the diaper 1. Therefore, the absorbent body 4 (absorbent core 40) is not easily broken during use of the diaper 1, and excellent absorption performance can be stably exhibited. Further, with such a structure, the absorbability of the excreted liquid by the absorbent core 40 is improved, and the non-cumulative fibers 5A to 5E are effectively prevented from being buried due to the swelling of the absorbent material contained in the core forming material. To be done.

The absorbent core 40 and the core wrap sheets 41 and 42 are joined by an adhesive such as a hot melt adhesive. The adhesive application pattern is not particularly limited, and examples thereof include an application pattern in which linear (straight, spiral, etc.) adhesive application portions extending in the vertical direction X are intermittently arranged in the horizontal direction Y. Further, as shown in FIG. 3, the absorbent core 40 is squeezed inward at the crotch portion 1M, and the core wrap sheets 41, 42 extend in the lateral direction Y from the squeezed portion. The extending portions of 41 and 42 are joined to each other in the crotch portion 1M with an adhesive to form a core wrap sheet joining portion 43.

The joint portions of the sheets 41 and 42 in the non-fiber-stacked portions 5A to 5E can be formed as follows, for example. That is, an adhesive such as a hot melt adhesive is applied in advance to the corresponding positions of the non-fiber-laden portions 5A to 5E on at least one of the sheets 41 and 42, and the absorbent core 40 is covered with the sheets 41 and 42. After obtaining the absorbent body 4, the non-fiber-laden portions 5A to 5E of the absorbent body 4 are simultaneously pressed from the skin-facing surface side and the non-skin-facing surface side, so that both sheets in the non-fiber-laden portions 5A to 5E. 41 and 42 can be joined. For the pressing process of the non-stacked portions 5A to 5E, known embossing such as embossing with or without heat or ultrasonic embossing can be adopted. When the heating/pressurizing process such as embossing accompanied by heat is adopted as the pressing process of the non-fiber-laden parts 5A to 5E, both the sheets 41 and 42 are thermocompression-bonded to each other, and therefore, the adhesive force by the adhesive is combined. Therefore, the two sheets 41, 42 can be firmly joined together. In addition, the pressing process of the non-spun fiber portions 5A to 5E may be performed by pushing the skin-side core wrap sheet 41 into the non-skin side core wrap sheet 42 side at the formation position of the non-spun fiber portions 5A to 5E. Alternatively, the non-skin side core wrap sheet 42 may be pushed into the skin side core wrap sheet 41 side. In the former case, the non-skin side core wrap sheet 42 is flat, but the skin side core wrap sheet 41 is recessed in the formation positions of the non-fiber-laying portions 5A to 5E, and in the latter case, the skin side core wrap. Although the sheet 41 is flat, the non-skin side core wrap sheet 42 is recessed at the positions where the non-fiber-laden portions 5A to 5E are formed.

As one of the main features of the diaper 1, as shown in FIG. 4, a plurality (9 pieces) of non-fiber-fabricated portions 5A to 5E in the absorbent core 40 are directed toward the longitudinal end 40F or 40R of the absorbent core 40. One point is that all the projected images formed when projected in the vertical direction X are connected to each other in the crotch minimum width portion 40S of the absorbent core 40. That is, the plurality of non-fiber-stacking portions 5A to 5E in the absorbent core 40 are the non-fiber-stacking portions located at the outermost one side in the lateral direction Y (in FIG. 3, among the pair of non-fiber-stacking portions 5B and 5B). One or one of the pair of non-stacked portions 5E, 5E) to the other outermost non-stacked portion (in FIG. 3, the other of the pair of non-stacked portions 5B, 5B or the pair) Are arranged and formed so that the projected images of all the non-fiber-stacking parts 5A to 5E up to the non-fiber-stacking parts 5E and 5E) are continuously connected in the lateral direction Y in the crotch minimum width part 40S. There is.

As described above, the core wrap sheets 41 and 42 are joined to each other at the plurality of non-fiber-laying portions 5A to 5E formed on the absorbent core 40, thereby preventing the absorbent body 4 from being broken while the diaper 1 is worn. However, merely adopting such a configuration cannot effectively prevent breakage of the absorber 4. In particular, the portion of the absorbent core 40 located in the crotch portion 1M has the excretion portion facing portion that directly receives the excretion liquid such as urine, and is a portion where the load of the legs of the wearer is likely to be applied, While wearing the diaper 1, cracks are likely to occur due to the movement of the wearer's legs, and a part of the absorbent core 40 divided by the cracks in the crotch portion 1M slides down below the wearer's crotch due to its own weight. There was a possibility that breakage of the absorber 4 would occur.

On the other hand, in the diaper 1, as described above, the plurality of non-fiber-fabricated portions 5A to 5E in the absorbent core 40 have projected images in the vertical direction X that are laterally in the crotch minimum width portion 40S of the crotch portion 1M. Since the absorbent core 40 (absorber 4) is arranged and formed so as to be continuously connected in the direction Y (see FIG. 4 ), the absorbent core 40 is constrained in both the longitudinal direction X and the lateral direction Y, and is hard to move, and is worn. Even when the absorbent core 40 is divided due to cracks in the crotch minimum width portion 40S and its vicinity due to the movement of the legs of the person, the non-fiber accumulation portions 5A to 5E function as a support against the slipping-off of the absorbent core 40. Therefore, breakage of the absorber 4 is effectively prevented.

As shown in FIG. 3, among the plurality of non-productive portions 5A to 5E, the non-productive portions 5B and 5E located on the outermost side in the lateral direction Y are not arranged in the crotch minimum width portion 40S. Moreover, it overlaps with the virtual extension line 40SL of the side edge along the vertical direction X of the crotch minimum width portion 40S. With this configuration, the movement of the crotch minimum width portion 40S (particularly the movement in the lateral direction Y), which is a portion where breakage of the absorber 4 is particularly likely to occur, is further restrained, so that breakage of the absorber 4 is more reliable. To be prevented. Even when the non-fiber-laying portions 5B and 5E located on the outermost side in the horizontal direction Y are arranged outside the virtual extension line 40SL in the horizontal direction Y without overlapping the virtual extension line 40SL. The same effect as described above is achieved.

In the diaper 1, the structure shown in FIG. 4 (projected images of the plurality of non-fiber-fabricated portions 5A to 5E in the vertical direction X are continuously connected in the lateral direction Y in the crotch minimum width portion 40S) is adopted. On the premise that the following constitutions (1) and (2) are adopted, the restraining force against the movement of the absorbent body 4 particularly in the lateral direction Y is increased, and the crotch portion 1M of the absorbent core 40 is increased. It is even more difficult to break the part where it is located.
(1) The absorbent core 40 has the crotch minimum width portion 40S in the crotch portion 1M, and the non-fiber-laying portions 5B and 5E arranged on one side and the other side in the vertical direction X with reference to the crotch minimum width portion 40S. Are arranged so as to overlap with the virtual extension line 40SL or to be located outside the virtual extension line 40SL in the lateral direction Y (see FIG. 3).
(2) The skin side core wrap sheet 41 and the non-skin side core wrap sheet 42 are joined at an outer position in the longitudinal direction X of the absorbent core 40 in the crotch portion 1M to form a core wrap sheet joint portion 43. (See FIG. 3).

By the way, in general, the larger the area of the plurality of non-fiber-fabricated portions 5A to 5E, or the larger the number per unit area, the more the binding force against the movement of the absorbent core 40 is improved, and thus the absorbent body 4 is broken. Although the hardness is improved, on the other hand, the absorption performance tends to decrease. Considering such a point, from the viewpoint of the balance between the breakage of the absorbent body and the absorption performance, the areas of the plurality of non-fiber-fabricated portions 5A to 5E on the skin-facing surface and the non-skin-facing surface of the absorbent core 40, respectively. Is preferably 30% or less, particularly 10% or less, and particularly 4 to 8% of the total area of the skin facing surface or the non-skin facing surface of the absorbent core 40.

From the same viewpoint, an arbitrary one is selected from the plurality of non-fiber-stacking portions 5A to 5E, and an imaginary straight line that traverses the absorbent core 40 in the lateral direction Y through the selected non-fiber-stacking portion is selected. When one is drawn, the sum of the lengths of the overlapping portions of all the non-fiber-laden parts overlapping the virtual straight line with the virtual straight line is 50 times the length of the overlapping portion of the virtual straight line and the absorbent core. % Or less, particularly 35% or less, and particularly preferably 15 to 25%. As an example of the virtual straight line, FIG. 3 shows a virtual straight line 61 that crosses the absorbent core 40 in the lateral direction Y through a pair of non-fiber-fabricated portions 5A, 5A. The total length (t1+t2) of the overlapping portions with the non-stacked portions 5A and 5A is the length of the overlapping portion between the virtual straight line 61 and the absorbent core 40, that is, the absorbent core 40 at the position of the virtual straight line 61. It is preferably 50% or less of the total length in the horizontal direction Y.

From the same viewpoint, an arbitrary one is selected from the plurality of non-fiber-fabricated portions 5A to 5E, and an imaginary straight line that traverses the absorbent core 40 in the longitudinal direction X is passed through the selected non-fiber-fabricated portion. When one is drawn, the sum of the lengths of the overlapping portions of all the non-fiber-laden parts overlapping the virtual straight line with the virtual straight line is 50 times the length of the overlapping portion of the virtual straight line and the absorbent core. % Or less, particularly 20% or less, and particularly preferably 5 to 10%.

From the same viewpoint, in the plurality of non-fiber-stacking portions 5A to 5E, an arbitrary one non-fiber-laying portion and the maximum inscribed point that is closest to the center of the maximum inscribed circle of the arbitrary one in plan view. The distance between the centers of the maximum inscribed circles of the two non-productive parts with respect to the other one non-productive part having the center of the circle is the radius of each of the two maximum inscribed circles. The total amount is preferably 2 times or more, particularly 2.5 times or more, and 10 times or less, particularly preferably 8 times or less. If the center-to-center distance between the maximum inscribed circles of the two non-stacked portions is too short, swelling inhibition may occur, which is not preferable. As described above, the diameter of the maximum inscribed circle of the non-fiber-stacked portion in plan view is equal to the opening diameter of the non-fiber-laid portion.

The above-mentioned "center-to-center distance between the maximum inscribed circles of two non-stacked fiber portions" will be described with reference to FIG.
In both of FIGS. 7A and 7B, two non-laden fiber portions 5G having a rectangular shape in plan view are arranged in parallel with their longitudinal directions aligned with the longitudinal direction X, In this case, the position of the maximum inscribed circle 50 of each non-fiber-stacking portion 5G is not fixed in one place, and any position in the vertical direction X can be selected. Therefore, simply two non-fiber-stacking portions 5G, When the center-to-center distance between the maximum inscribed circles 50, 50 of 5G is set, the center-to-center distance L1 in FIG. 7A may be present and the center-to-center distance L2 in FIG. 7B may be present. However, the above-mentioned "center-to-center distance between the maximum inscribed circles of the two non-stacked portions" is, as is clear from the above definition, "the shortest center-to-center distance" among multiple center-to-center distances. 7A, only the center-to-center distance L1 in FIG. 7A meets the definition, and the center-to-center distance L2 in FIG. It is not the "center-to-center distance between the maximum inscribed circles".
7C and FIG. 7D, two non-fiber-fabricated portions 5G each having a rectangular shape in plan view are arranged in series so that their longitudinal directions coincide with the lateral direction Y. However, in this case, the "center-to-center distance between the maximum inscribed circles of the two non-fiber-fabricated portions" is the "center-to-center distance" L3 in FIG. 7(c), The center-to-center distance L4 in FIG. 7D is not the above-mentioned "center-to-center distance between the maximum inscribed circles of the two non-fiber-laying portions".

The opening diameters or diameters (the diameters of the maximum inscribed circles) of 5A to 5E of the non-stacked portion 5 having a circular shape in plan view are preferably 10 mm or more, more preferably 15 mm or more, and preferably 40 mm or less, It is preferably 30 mm or less, more specifically, 10 mm or more and 40 mm or less, and further preferably 15 mm or more and 30 mm or less. When the shape of the non-productive portion in a plan view is a non-circular shape such as a quadrangle, the opening diameter of the non-productive portion is in the same range as the opening diameter, that is, the diameter of the circular shape in the plan view. It is preferable to set.

In the diaper 1, as illustrated for the non-fiber-laden section 5C in FIG. 2, the surface sheet 2 and the skin-side core wrap sheet 41 are joined to each other in the plurality of non-fiber-laden sections 5A to 5E. The two sheets 2 and 41 in the non-fiber-stacked portions 5A to 5E are joined by an adhesive. The joints between the two sheets 2 and 41 in the non-fiber-stacked portions 5A to 5E can be formed as follows, for example. That is, an adhesive such as a hot melt adhesive is applied in advance to the corresponding positions of the non-fiber-laden portions 5A to 5E on at least one of the sheets 2 and 41, and the absorbent body 4, more specifically the sheet 41 After covering the skin-facing surface with the surface sheet 2, the corresponding positions of the non-fiber-fabricated portions 5A to 5E on the surface sheet 2 are pressed from the surface sheet 2 side, so that the non-fiber-fabricated portions 5A to 5E have both sheets 2. 41 can be joined. Since the sheets 2 and 41 are joined to each other in the non-spun portions 5A to 5E, a groove is formed on the surface that comes into contact with the skin. Therefore, when urinating, urine is likely to spread quickly in the vertical direction and feels dry. The effect of improving is exhibited.

In the diaper 1, as shown in FIG. 2, not only the topsheet 2 and the skin-side core wrap sheet 41 are joined in the non-spun portions 5A to 5E, but also the backsheet 3 and the non-skin side. The core wrap sheet 42 is also joined by an adhesive. The joints between the sheets 3 and 42 in the non-fiber-stacked portions 5A to 5E can be formed by the same method as the joint between the sheets 2 and 41 described above.

In the diaper 1, the joining force H2 between the skin-side core wrap sheet 41 and the non-skin side core wrap sheet 42 in each of the non-spun fiber portions 5A to 5E is equal to the surface sheet 2 and the skin side in each of the non-spun fiber portions 5A to 5E. It is made larger than the joining force H1 with the core wrap sheet 41. When the surface sheet 2 and the skin side core wrap sheet 41 are joined in the non-spun portions 5A to 5E, the absorber 4, particularly the non-spun fibers, follows the movement of the wearer's body while wearing the diaper 1. When a shearing force acts on the portions 5A to 5E, the joints between the core wrap sheets 41 and 42 in the non-fiber-laden portions 5A to 5E may be destroyed. On the other hand, by setting the joining force H2>the joining force H1 as described above, the joining portion between the surface sheet 2 and the skin side core wrap sheet 41, which are joined to each other with a relatively low joining force H1, is better. Since the core wrap sheets 41 and 42 are destroyed before the joints between the core wrap sheets 41 and 42, it is important to achieve the above-described operational effects. Is more easily maintained.

The ratio of the bonding force H2 to the bonding force H1 (bonding force H2/bonding force H1) is preferably 1.1 or more, more preferably 1.5 or more, and preferably 5.0 or less, more preferably 3.0. Hereinafter, more specifically, it is preferably 1.1 or more and 5.0 or less, and more preferably 1.5 or more and 3.0 or less.
The joining force H1 between the surface sheet 2 and the skin side core wrap sheet 41 in each of the non-fiber-laden portions 5A to 5E is preferably 0.2 N or more, more preferably 1.0 N or more, and preferably 4.5 N or less, It is more preferably 3.5 N or less, more specifically 0.2 N or more and 4.5 N or less, and further preferably 1.0 N or more and 3.5 N or less.
The joining force H2 between the skin-side core wrap sheet 41 and the non-skin side core wrap sheet 42 in each of the non-fiber layer portions 5A to 5E is preferably 0.5 N or more, more preferably 1.5 N or more, and preferably 5 N. 0.0N or less, more preferably 4.0N or less, more specifically, 0.5N or more and 5.0N or less, and further preferably 1.5N or more and 4.0N or less.

The joining forces H1 and H2 can be measured as follows. Sufficiently hold each joint by 20 mm in the longitudinal direction and laterally in the chuck of Tensilon tensile tester (manufactured by Orientec Co., Ltd.) from the lateral end of the joint outward. Cut so that the length of the surface sheet 2 and the skin side core wrap sheet 41 or the skin side core wrap sheet 41 and the non-skin side core wrap sheet 42 are sandwiched in a chuck so that the joint surface is peeled from the lateral direction, and the pulling speed The distance between the chucks was expanded at 300 mm/min, and the maximum point strength at the time of peeling was taken as the respective bonding force.

The absorbent body according to the present invention is not limited to the absorbent body 4 shown in FIG. 3, and those within a range not departing from the spirit of the present invention can be appropriately used, and examples thereof include the absorbent body 4A shown in FIG. In the absorber 4A shown in FIG. 5, the same components as those of the absorber 4 are designated by the same reference numerals, and the description of the absorber 4 is appropriately applied to the components that are not particularly described.

In the absorbent body 4A, as shown in FIG. 5, the non-fiber-stacked portions 5A, 5B, 5C, 5D, 5E, and 5F are vertically arranged in this order from the abdominal side longitudinal direction end 40F to the dorsal side longitudinal direction end 40R. It is formed intermittently in the direction X. The non-stacked fiber portions 5B and 5E are formed symmetrically with respect to a vertical center line Lx that divides the absorbent core 40 into two in the horizontal direction Y and extends in the vertical direction X, and each pair exists. Only one non-fiber-laying portion 5A, 5C, 5D, 5F exists on the vertical center line Lx. Further, the size of the non-fiber-stacking portion in plan view, that is, the opening diameter (the diameter of the largest inscribed circle) of the non-fiber-lapping portion, is the same between the non-fiber-laden portions 5A and 5F, and the non-fiber-laden portions 5B to 5E. Are the same as each other, and the non-fiber-stacking portions 5A and 5F are larger than the non-fiber-stacking portions 5B to 5E. That is, in the absorbent body 4A, the non-fiber-fabricated portions 5A and 5F having a relatively large opening diameter are arranged on the outermost side in the vertical direction X, and the non-fiber-fabricated portions 5B to 5E having a relatively small opening diameter are not arranged. It is arranged between the fiber stack portions 5A and 5F. Further, the non-fiber-laying portions 5A to 5F in the absorber 4A are arranged in a staggered pattern.

Although the present invention has been described above, the present invention is not limited to the above-described embodiment and can be modified as appropriate. The absorbent article of the present invention is not limited to the deployable disposable diaper as in the above-mentioned embodiment, but widely includes articles used for absorbing body fluids (urine, menstrual blood, loose stool, sweat, etc.) discharged from the human body. , Pants-type disposable diapers, sanitary napkins, sanitary shorts and the like are also included. Regarding the above-described embodiment of the present invention, the following supplementary notes are further disclosed.

<1>
An absorbent article, which has a longitudinal direction extending from the wearer's abdominal side to the back side through the crotch portion and a lateral direction orthogonal to the longitudinal direction, and a crotch portion arranged in the crotch portion when worn, and the crotch portion An absorptive article having a ventral side portion arranged on the abdominal side of the wearer than the portion and a back side portion arranged on the back side of the wearer than the crotch portion in the longitudinal direction,
The absorbent body is a liquid-retaining absorbent core, a skin-side core wrap sheet that covers the skin-facing surface of the absorbent core, and a non-skin-side core wrap sheet that covers the non-skin-facing surface of the absorbent core. And includes
In the absorbent core, a plurality of non-fiber-laden parts that penetrate the absorbent core in the thickness direction are individually arranged and formed, and the skin-side core wrap sheet and the non-skin-side core are formed in each of the non-fiber-laden parts. It is joined to the wrap sheet,
All of the projection images formed when the plurality of non-fiber-laden parts are vertically projected toward the longitudinal end of the absorbent core have a lateral length in the crotch portion of the absorbent core. Absorbent articles that are connected to each other in the smallest crotch width portion that is the smallest portion.

<2>
When an arbitrary one is selected from among the plurality of non-fiber-stacking parts and one virtual straight line transversely crossing the absorbent core through the selected non-fiber-stacking part is drawn, the virtual straight line <1>, wherein the sum of the lengths of the overlapping portions of the non-stacked portion overlapping with the virtual straight line is 50% or less of the length of the overlapping portion of the virtual straight line and the absorbent core. The absorbent article according to.
<3>
Of the plurality of non-spun portions, the non-spun portion that is located on the outermost side in the lateral direction is not arranged in the crotch minimum width portion, and the side along the longitudinal direction of the crotch minimum width portion. The absorbent article according to <1> or <2>, which overlaps with the virtual extension line of the edge or is arranged laterally outward of the virtual extension line.
<4>
<1> to <wherein the surface sheet is provided on the skin-facing surface side of the absorbent body, and the surface sheet and the skin-side core wrap sheet are joined in each of the plurality of non-fiber-fabricated portions. The absorbent article according to any one of 3>.
<5>
Furthermore, it comprises a back sheet disposed on the non-skin-facing surface side of the absorbent body, in each of the plurality of non-fiber-laden parts, the top sheet and the skin-side core wrap sheet are joined together, and The absorbent article according to <4>, wherein the back sheet and the non-skin side core wrap sheet are joined.

<6>
Furthermore, comprising a surface sheet disposed on the skin facing surface side of the absorbent body, the surface sheet and the skin side core wrap sheet are joined in the non-fiber-laden portion,
The joining force H2 between the skin-side core wrap sheet and the non-skin side core wrap sheet in the non-spun portion is greater than the joining force H1 between the surface sheet and the skin side core wrap sheet in the non-spun portion. The absorbent article according to any one of <1> to <3>.
<7>
The ratio of the bonding force H2 to the bonding force H1 is, as the bonding force H2/bonding force H1, preferably 1.1 or more, more preferably 1.5 or more, and preferably 5.0 or less, more preferably 3 The absorbent article according to <6>, which is 0.0 or less.
<8>
The bonding force H1 is preferably 0.2 N or more, more preferably 1.0 N or more, and preferably 4.5 N or less, more preferably 3.5 N or less, according to <6> or <7>. Absorbent article.
<9>
Any one of the above <6> to <8>, wherein the bonding force H2 is preferably 0.5 N or more, more preferably 1.5 N or more, and preferably 5.0 N or less, more preferably 4.0 N or less. The absorbent article according to item 1.

<10>
The absorbent article according to any one of <1> to <9>, wherein the plurality of non-fiber-laying portions are arranged in a staggered pattern.
<11>
In the zigzag arrangement of the plurality of non-textile portions, a plurality of virtual straight lines extending in the vertical direction through the centers of the plurality of non-textile portions are arranged laterally at predetermined intervals and are adjacent to each other. The absorbent article according to <10>, wherein the positions of the non-fiber-laden portions are displaced from each other by the two virtual straight lines.
<12>
In the zigzag arrangement of the plurality of non-textile portions, a plurality of virtual straight lines extending in the vertical direction through the centers of the plurality of non-textile portions are arranged laterally at predetermined intervals and are adjacent to each other. The absorbent article according to <10> above, wherein the positions of the non-fiber-laden portions in the vertical direction do not match between the two virtual straight lines.

<13>
The absorbent article according to any one of <1> to <12>, wherein the absorbent core, the skin-side core wrap sheet, and the non-skin-side core wrap sheet are respectively joined by an adhesive. ..
<14>
The absorbent core is squeezed inward in the crotch part, and the skin side core wrap sheet and the non-skin side core wrap sheet extend laterally from the squeezed portion, and both core wrap sheets extend. The absorbent article according to any one of the above items <1> to <13>, wherein the projecting portions are joined together by an adhesive in the crotch portion to form a core wrap sheet joining portion.
<15>
The non-skin side core wrap sheet is flat, but the skin side core wrap sheet is recessed in a concave shape at the formation position of the non-fiber stack portion, according to any one of <1> to <14>. Absorbent article.

<16>
In each of the skin-facing surface and the non-skin-facing surface of the absorbent core, the sum of the areas of the plurality of non-textile portions is 30% or less of the total area of the skin-facing surface or the non-skin-facing surface of the absorbent core, The absorbent article according to any one of <1> to <15>, which is preferably 10% or less, and more preferably 4 to 8%.
<17>
When an arbitrary one is selected from among the plurality of non-fiber-stacking parts and one virtual straight line transversely crossing the absorbent core through the selected non-fiber-stacking part is drawn, the virtual straight line The total length of the overlapping portions with the virtual straight line of all the non-fiber-laden portions overlapping with 50% or less, preferably 35% or less of the length of the overlapping portion of the virtual straight line and the absorbent core, The absorbent article according to any one of <1> to <16>, which is more preferably 15 to 25%.
<18>
There is the virtual straight line that traverses the absorbent core laterally through the pair of non-fiber-stacking portions, and the total length of the overlapping portions of the virtual straight line and the pair of non-fiber-stacking portions is, respectively, The absorbent article according to <17>, wherein the length of the overlapping portion between the virtual straight line and the absorbent core is 50% or less of the total length of the absorbent core in the horizontal direction at the virtual straight line position.
<19>
When an arbitrary one is selected from the plurality of non-textile portions and one virtual straight line that crosses the absorbent core in the longitudinal direction through the selected non-fiber-laden portion is drawn, the virtual straight line The total length of the overlapping portions with the virtual straight line of all non-fiber-laden portions overlapping with 50% or less, preferably 20% or less of the length of the overlapping portion of the virtual straight line and the absorbent core, The absorbent article according to any one of <1> to <18>, which is more preferably 5 to 10%.
<20>
Arbitrary one non-fiber-stacking portion selected from the plurality of non-fiber-stacking portions, and the maximum inscribed circle closest to the center of the maximum inscribed circle of the arbitrary one non-fiber-laden portion in plan view The distance between the centers of the maximum inscribed circles of the two non-productive parts with the other one non-productive part having the center of is the sum of the radii of the two maximum inscribed circles. Is preferably 2 times or more, more preferably 2.5 times or more, and preferably 10 times or less, more preferably 8 times or less, <1> to <19> Goods.
<21>
Each of the plurality of non-productive portions has a circular shape in plan view, and the diameter of each non-productive portion is preferably 10 mm or more, more preferably 15 mm or more, and preferably 40 mm or less, more preferably 30 mm or less. The absorbent article according to any one of <1> to <20>.

<22>
In the central portion in the vertical direction including the crotch portion, both side edges along the vertical direction are curved in an inward arc shape, and the central portion in the vertical direction is inwardly constricted in an hourglass shape in plan view. The absorbent article according to any one of 1> to <21>.
<23>
The thickness of the portion other than the non-fiber-laden portion of the absorbent core under no load is preferably 2 mm or more, more preferably 3 mm or more, and preferably 15 mm or less, more preferably 10 mm or less. <1> ~ The absorbent article according to any one of <22>.
<24>
The basis weight of the absorbent core is preferably 100 g/m ² or more, more preferably 300 g/m ² or more, and preferably 1000 g/m ² or less, more preferably 600 g/m ² or less <1> ~ The absorbent article according to any one of <23>.
<25>
The absorbent article according to any one of <1> to <24>, wherein the skin side core wrap sheet and the non-skin side core wrap sheet are one continuous sheet.

Hereinafter, the present invention will be described more specifically by way of examples, but the present invention is not limited to the examples.

[Example 1]
An expandable disposable diaper having a basic configuration similar to that of the diaper 1 shown in FIGS. 1 to 4 was produced by a conventional method. An air-through nonwoven fabric having a basis weight of 30 g/m ² was used as the topsheet. As the back sheet, a liquid-impermeable and moisture-permeable polyethylene resin film (containing calcium carbonate) having a basis weight of 18 g/m ² was used. As the core wrap sheet, one piece of SMS (spun bond/melt blow/spun bond) non-woven fabric having a basis weight of 10 g/m ² is used to cover the skin-facing surface and the non-skin-facing surface of the absorbent core, A side core wrap sheet and a non-skin side core wrap sheet were used.
As the absorptive core, the same absorptive core 40 shown in FIG. 3 was manufactured according to a conventional method, and the non-fiber-fabricated portion was formed by intentionally hindering the deposition of the core-forming material as described above. The absorbent core used in Example 1 has a single-layer structure in which a particulate water-absorbing polymer (SAP) is held in a fiber assembly, and includes fluff pulp 200 g/m ² and water-absorbing polymer 285 g/m ² . The absorbent core has a total basis weight of 485 g/m ² and is composed of a uniform mixture of Regarding the dimensions of the absorbent core used in Example 1, the longitudinal length was 370 mm, the minimum width was 75 mm, and the thickness was 3.9 mm. Further, the non-fiber-fabricated portion of the absorbent core used had a length of 105 mm in the longitudinal direction and a width of 14 mm.
After the absorbent core is covered with a core wrap sheet to form an absorbent body, the non-textile portion of the absorbent body is heated and pressed from both the skin-facing surface and the non-skin-facing surface to give the skin in the non-textile portion. The side core wrap sheet and the non-skin side core wrap sheet were joined. The joint portion between the core wrap sheets in the non-fiber stack portion is formed by an adhesive applied in advance and heat fusion between the core wrap sheets.

[Comparative Example 1]
A deployable disposable diaper was produced in the same manner as in Example 1 except that the non-fiber-laden section was not formed in the absorbent core.

[Comparative Example 2]
A deployable disposable diaper was produced in the same manner as in Example 1 except that the absorbent body 4Z shown in FIG. 6 was used as the absorbent body instead of the absorbent body 4 shown in FIG. The absorbent body 4Z has a rectangular shape in a plan view, and two absorbent bodies 4Z are formed at the center of the absorbent core 40 in the lateral direction Y with the longitudinal direction thereof aligned with the longitudinal direction X, and at least the minimum crotch width of the crotch part 1M. It extends in the vertical direction X through the portion 40S (the excretion portion facing portion). The two non-laden fibers 5Z and 5Z are formed symmetrically with respect to the vertical center line Lx.

[Evaluation]
With respect to the disposable diapers of Examples and Comparative Examples, the number of times the absorbent body was destroyed was evaluated by the following method.

<Measurement method of the number of times of absorber destruction operation>
The diaper to be evaluated is folded into two in the vertical direction with the surface facing the skin, that is, with the surface sheet inside, and both sides of the center of the absorbent body, which is the site where artificial urine is to be injected, are grasped with fingers and alternated in the vertical direction. Move to. After repeating this vertical movement 50 times, each part of the diaper is expanded and expanded in a flat shape as shown in FIG. 1, and the surface sheet is fixed upward on the horizontal surface, and the surface of the absorbent body in the central part is fixed. 40 g of artificial urine was injected onto the sheet to absorb the urine, and then left in a natural state for 3 minutes. Next, the up-and-down motion performed before the injection of artificial urine is performed again on the diaper. This vertical movement is assumed to be the movement of the wearer's leg while wearing the diaper. This vertical movement is repeated until the absorber is broken, and the number of vertical movements required to break the absorber is referred to as the absorber destruction operation count. If even part of the absorber collapses, it is determined that the absorber has broken. The greater the number of times the absorbent body is destroyed, the better the shape retention of the absorbent body, and it can be judged that the absorbent body is less likely to break during wearing, and the evaluation is high.

The composition of artificial urine used in the above measurement method is as follows. Urea 1.94% by mass, sodium chloride 0.7954% by mass, magnesium sulfate (heptahydrate) 0.11058% by mass, calcium chloride (dihydrate) 0.06208% by mass, potassium sulfate 0.19788% by mass. , 0.0035% by mass of polyoxyethylene lauryl ether and ion-exchanged water (remaining amount).

The disposable diaper of Comparative Example 1 was one in which the non-fiber-laying portion was not formed in the absorbent core, and the number of times of the absorbent body breaking operation was 26 times.
As shown in FIG. 6, the disposable diaper of Comparative Example 2 has a plurality of (two) non-fiber-fabricated portions 5Z formed on the absorbent core 40. The projected image in the direction X was discontinuous in the lateral direction Y in the crotch minimum width portion 40S of the crotch portion 1M, and the absorber destruction operation number was 36 times.
On the other hand, the configuration shown in FIG. 4 is adopted, that is, the projected images of the plurality of non-fiber-fabricated portions 5A to 5E in the vertical direction X are continuously connected in the lateral direction Y in the crotch minimum width portion 40S. In the disposable diaper of Example 1, the number of times of destruction of the absorbent body was 58, which was higher than in Comparative Examples 1 and 2.
From the above, in order to obtain an absorbent article having excellent shape retention of the absorbent body and the absorbent body not easily broken during wearing, the configuration shown in FIG. 4 is adopted for the arrangement of the non-fiber-laden part in the absorbent core. It turns out that doing is effective.

1 Disposable diapers (absorbent articles)
1F Abdominal part 1M of absorbent article 1M Crotch part of absorbent article 1R Backside part of absorbent article 2 Topsheet 3 Backsheet 4,4A, 4Z Absorber 40 Absorbent core 40S Inseam minimum width part 41 Skin core wrap Sheet 42 Non-skin side core wrap sheet 43 Core wrap sheet Joints 5A, 5B, 5C, 5D, 5E, 5F, 5G, 5Z Non-stacked fiber portion X Vertical direction Y Horizontal direction

Claims (21)

An absorbent article, which has a longitudinal direction extending from the wearer's abdominal side to the back side through the crotch portion and a lateral direction orthogonal to the longitudinal direction, and a crotch portion arranged in the crotch portion when worn, and the crotch portion A disposable diaper having a ventral side portion disposed on the wearer's ventral side than a portion and a back side portion disposed on the wearer's back side from the crotch portion in the longitudinal direction,
The absorbent body is a liquid-retaining absorbent core, a skin-side core wrap sheet that covers the skin-facing surface of the absorbent core, and a non-skin-side core wrap sheet that covers the non-skin-facing surface of the absorbent core. And includes
In the absorbent core, a plurality of non-fiber-laden parts that penetrate the absorbent core in the thickness direction are individually arranged and formed, and the skin-side core wrap sheet and the non-skin-side core are formed in each of the non-fiber-laden parts. It is joined to the wrap sheet,
The non-stacked portion is arranged at least in the crotch part,
All of the projection images formed when the plurality of non-fiber-laden parts are vertically projected toward the longitudinal end of the absorbent core have a lateral length in the crotch portion of the absorbent core. In the crotch minimum width part which is the smallest part, it is connected to each other,
When an arbitrary one is selected from among the plurality of non-fiber-stacking parts and one virtual straight line transversely crossing the absorbent core through the selected non-fiber-stacking part is drawn, the virtual straight line The disposable diaper in which the total length of the overlapping portions of the non-stacked portion overlapping with the virtual straight line is 50% or less of the length of the overlapping portion of the virtual straight line and the absorbent core. An absorbent article, which has a longitudinal direction extending from the wearer's abdominal side to the back side through the crotch portion and a lateral direction orthogonal to the longitudinal direction, and a crotch portion arranged in the crotch portion when worn, and the crotch portion A disposable diaper having a ventral side portion disposed on the wearer's ventral side than a portion and a back side portion disposed on the wearer's back side from the crotch portion in the longitudinal direction,
The absorbent body is a liquid-retaining absorbent core, a skin-side core wrap sheet that covers the skin-facing surface of the absorbent core, and a non-skin-side core wrap sheet that covers the non-skin-facing surface of the absorbent core. And includes
In the absorbent core, a plurality of non-fiber-laden parts that penetrate the absorbent core in the thickness direction are individually arranged and formed, and the skin-side core wrap sheet and the non-skin-side core are formed in each of the non-fiber-laden parts. It is joined to the wrap sheet,
The plurality of non-fiber-stacking parts include a non-fiber-stacking part having a relatively large opening diameter and a non-fiber-stacking part having a relatively small opening diameter, and the two non-fiber-stacking parts are alternately arranged in the vertical direction. And
All of the projection images formed when the plurality of non-fiber-laden parts are vertically projected toward the longitudinal end of the absorbent core have a lateral length in the crotch portion of the absorbent core. In the crotch minimum width part which is the smallest part, it is connected to each other,
When an arbitrary one is selected from among the plurality of non-fiber-stacking parts and one virtual straight line transversely crossing the absorbent core through the selected non-fiber-stacking part is drawn, the virtual straight line The disposable diaper in which the total length of the overlapping portions of the non-stacked portion overlapping with the virtual straight line is 50% or less of the length of the overlapping portion of the virtual straight line and the absorbent core. An absorbent article, which has a longitudinal direction extending from the wearer's abdominal side to the back side through the crotch portion and a lateral direction orthogonal to the longitudinal direction, and a crotch portion arranged in the crotch portion when worn, and the crotch portion A disposable diaper having a ventral side portion disposed on the wearer's ventral side than a portion and a back side portion disposed on the wearer's back side from the crotch portion in the longitudinal direction,
The absorbent body is a liquid-retaining absorbent core, a skin-side core wrap sheet that covers the skin-facing surface of the absorbent core, and a non-skin-side core wrap sheet that covers the non-skin-facing surface of the absorbent core. And includes
In the absorbent core, a plurality of non-fiber-laden parts that penetrate the absorbent core in the thickness direction are individually arranged and formed, and the skin-side core wrap sheet and the non-skin-side core are formed in each of the non-fiber-laden parts. It is joined to the wrap sheet,
The non-stacked portion is arranged at least in the crotch part,
The plurality of non-fiber-stacking parts include a non-fiber-stacking part having a relatively large opening diameter and a non-fiber-stacking part having a relatively small opening diameter, and the two non-fiber-stacking parts are alternately arranged in the vertical direction. And
All of the projection images formed when the plurality of non-fiber-laden parts are vertically projected toward the longitudinal end of the absorbent core have a lateral length in the crotch portion of the absorbent core. In the crotch minimum width part which is the smallest part, it is connected to each other,
When an arbitrary one is selected from among the plurality of non-fiber-stacking parts and one virtual straight line transversely crossing the absorbent core through the selected non-fiber-stacking part is drawn, the virtual straight line The disposable diaper in which the total length of the overlapping portions of the non-stacked portion overlapping with the virtual straight line is 50% or less of the length of the overlapping portion of the virtual straight line and the absorbent core. Of the plurality of non-spun portions, the non-spun portion that is located on the outermost side in the lateral direction is not arranged in the crotch minimum width portion, and the side along the longitudinal direction of the crotch minimum width portion. The disposable diaper according to claim 1, wherein the disposable diaper overlaps with the virtual extension line of the edge or is arranged laterally outward of the virtual extension line. The surface sheet arranged on the skin-facing surface side of the absorbent body is provided, and the surface sheet and the skin-side core wrap sheet are bonded to each other in each of the plurality of non-fiber-fabricated portions . The disposable diaper according to any one of claims . Furthermore, it comprises a back sheet disposed on the non-skin-facing surface side of the absorbent body, in each of the plurality of non-fiber-laden parts, the top sheet and the skin-side core wrap sheet are joined together, and The disposable diaper according to claim 5 , wherein the back sheet and the non-skin side core wrap sheet are joined. Furthermore, comprising a surface sheet disposed on the skin facing surface side of the absorbent body, the surface sheet and the skin side core wrap sheet are joined in the non-fiber-laden portion,
The joining force H2 between the skin-side core wrap sheet and the non-skin side core wrap sheet in the non-spun portion is greater than the joining force H1 between the surface sheet and the skin side core wrap sheet in the non-spun portion. The disposable diaper according to any one of claims 1 to 7 . The disposable diaper according to claim 7 , wherein a ratio of the joining force H2 to the joining force H1 is 1.1 or more and 5.0 or less as a joining force H2/joining force H1. The disposable diaper according to any one of claims 1 to 9 , wherein the plurality of non-stacked fiber portions are arranged in a staggered pattern. In the zigzag arrangement of the plurality of non-textile portions, a plurality of virtual straight lines extending in the vertical direction through the centers of the plurality of non-textile portions are arranged laterally at predetermined intervals and are adjacent to each other. The disposable diaper according to claim 9 , wherein the positions of the non-fiber-laden portions are displaced from each other by the two virtual straight lines. In the zigzag arrangement of the plurality of non-textile portions, a plurality of virtual straight lines extending in the vertical direction through the centers of the plurality of non-textile portions are arranged laterally at predetermined intervals and are adjacent to each other. The disposable diaper according to claim 9 , wherein the two virtual straight lines are arranged such that the positions of the non-fiber stacking portions in the vertical direction do not match. Wherein the absorbent core and the skin-side core wrap sheet and the non-skin side core wrap sheets, disposable diaper according to any one of claim 1 to 11, which are joined by respective adhesive. The absorbent core is squeezed inward in the crotch part, and the skin side core wrap sheet and the non-skin side core wrap sheet extend laterally from the squeezed portion, and both core wrap sheets extend. The disposable diaper according to any one of claims 1 to 12 , wherein the projecting portions are joined at the crotch portion with an adhesive to form a core wrap sheet joining portion. Wherein at non-skin side core wrap sheets are flat, the skin-side core wrap sheets either disposable diaper according to one of claim 1 to 13, which is recessed in a concave shape in the formation position of the non-product defibrating unit. In each of the skin-facing surface and the non-skin-facing surface of the absorbent core, the sum of the areas of the plurality of non-textile portions is 30% or less of the total area of the skin-facing surface or the non-skin-facing surface of the absorbent core. The disposable diaper according to any one of claims 1 to 15 . When an arbitrary one is selected from among the plurality of non-fiber-stacking parts and one virtual straight line transversely crossing the absorbent core through the selected non-fiber-stacking part is drawn, the virtual straight line The sum of the lengths of the overlapping portions of the non-stacked portion that overlaps with the virtual straight line is 35% or less of the length of the overlapping portion of the virtual straight line and the absorbent core. 15. The disposable diaper according to any one of 15 . There is the virtual straight line that traverses the absorbent core laterally through the pair of non-fiber-stacking portions, and the total length of the overlapping portions of the virtual straight line and the pair of non-fiber-stacking portions is, respectively, The disposable diaper according to claim 16 , wherein the length is 50% or less of the length of the overlapping portion between the virtual straight line and the absorbent core. When an arbitrary one is selected from the plurality of non-textile portions and one virtual straight line that crosses the absorbent core in the longitudinal direction through the selected non-fiber-laden portion is drawn, the virtual straight line overlaps of all non-product defibrating unit, the total length of the overlap between the virtual straight line, according to claim 1 is 50% or less of the overlapping portion of the length between the virtual straight line and the absorbent core 17 The disposable diaper according to any one of 1. Arbitrary one non-fiber-stacking portion selected from the plurality of non-fiber-stacking portions, and the maximum inscribed circle closest to the center of the maximum inscribed circle of the arbitrary one non-fiber-laden portion in plan view The distance between the centers of the maximum inscribed circles of the two non-productive parts with the other one non-productive part having the center of is the sum of the radii of the two maximum inscribed circles. 10 times or less than twice of claims 1-18 disposable diaper according to any one of the. In the longitudinal center portion including the crotch portion, both side edges along the longitudinal direction are curved in an inward arc shape, and the longitudinal center portion has an hourglass shape inwardly constricted in a plan view. The disposable diaper according to any one of 1 to 19. The disposable diaper according to any one of claims 1 to 20, wherein the skin side core wrap sheet and the non-skin side core wrap sheet are one continuous sheet.

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