JP7037345B2 - Disposable diapers - Google Patents

Description

The present invention relates to disposable diapers.

Absorbent articles such as disposable diapers typically include a liquid permeable front sheet, a liquid impermeable back sheet and an absorber disposed between the two sheets. The absorbent body includes a liquid-retaining absorbent core in which a core-forming material containing wood pulp, a water-absorbent polymer, and the like is accumulated, and a water-permeable core wrap sheet that covers the absorbent core. What has been done is known. The core wrap sheet plays a role of ensuring the shape retention of the absorber and preventing the core forming material from falling off.

Conventionally, in disposable diapers, for the purpose of improving fit and liquid absorption, the absorbent core has a through hole penetrating the absorbent core in the thickness direction, or a low basis weight portion having a lower basis weight than the peripheral portion. Is being provided. For example, in Patent Document 1, in order to improve the fit and liquid absorbency of a disposable diaper, a low basis weight portion linear in a plan view is formed in a grid pattern on the absorbent core, and the absorbent core is provided with a high basis weight. It is described that it is divided into a plurality of blocks consisting of parts.

Japanese Unexamined Patent Publication No. 2013-255563

In disposable diapers, excrement such as urine is uniformly absorbed over a wide range of the absorber, and the "ratio of the portion actually used for liquid absorption to the entire absorber" (absorber utilization rate) is high. Is requested. If the absorber is difficult to absorb uniformly and the absorber utilization rate is low, the swelling portion due to liquid absorption and the non-swelling portion that does not absorb the liquid are remarkably mixed in the absorber after liquid absorption. As a result, steps are irregularly formed on the skin-facing surface of the absorber after the liquid is absorbed, and the skin-facing surface becomes uneven, which may cause inconvenience such as deterioration of wearing feeling. Disposable diapers capable of uniformly absorbing liquid over a wide range of absorbers have not yet been provided.

Therefore, an object of the present invention relates to providing a disposable diaper having excellent uniform absorbability of an absorber.

The present invention includes a liquid-retaining absorber and a surface sheet arranged on the skin-facing surface side of the absorber, and is orthogonal to the vertical direction extending from the ventral side of the wearer to the dorsal side via the crotch portion. It has a lateral direction, and has a crotch portion that is arranged so as to face the crotch portion when worn, a ventral portion that is arranged on the ventral side of the wearer from the crotch portion, and a wearer's portion rather than the crotch portion. A disposable diaper having a dorsal portion arranged on the dorsal side, wherein the absorber covers an absorbent core in which a core-forming material containing an absorbent material is accumulated and a skin-facing surface of the absorbent core. A vertical core wrap sheet that includes a skin-side core wrap sheet and a non-skin-side core wrap sheet that covers the non-skin facing surface of the absorbent core, and vertically divides the unfolded and stretched diaper into two equal parts. It extends in the vertical direction from the ventral side to the dorsal side across the center line, and a plurality of non-integrated portions of the core forming material are formed in the absorbent core, and the plurality of non-integrated portions are formed on the absorbent core. The main non-integrated portion includes a main non-integrated portion extending in the vertical direction at the lateral central portion of the absorbent core and an auxiliary non-integrated portion extending laterally outward from the main non-integrated portion. When the skin-side core wrap sheet and the non-skin-side core wrap sheet are joined to each other and the regions I to V are set in the diaper according to the following <method for determining regions I to V>, the regions II and The main non-integrated part is present in III, the auxiliary non-integrated part is present in region II, and the total area of the auxiliary non-integrated part present in regions II and III is present in regions I and IV. It provides disposable diapers that are larger than the total area of the accumulator.

<Method of determining areas I to V>
In the unfolded and stretched diaper, one virtual straight line extending laterally through the ventral end of the absorber is used as a reference line, and the diaper is located on the dorsal side of the reference line. Draw five virtual straight lines parallel to the reference line at equal intervals. The distance between the virtual straight lines is a value obtained by dividing the vertical length from the vertical center line to the vertical end on the ventral side of the absorber by 5, and further doubling the length. The regions divided into five by these six virtual straight lines are designated as region I, region II, region III, region IV, and region V in order from the one closest to the reference line.

INDUSTRIAL APPLICABILITY According to the present invention, a disposable diaper having excellent uniform absorbency of an absorber is provided.

FIG. 1 shows a partially broken surface sheet side, that is, a skin-facing surface side, showing an expanded state (expanded and extended state) in which an elastic member of each part is extended and expanded in a plane according to an embodiment of the disposable diaper of the present invention. It is a plan view. 2A is a schematic cross-sectional view taken along the line AA of FIG. 1, and FIG. 2B is a schematic cross-sectional view taken along the line BB of FIG. FIG. 3 is a schematic plan view of the absorber in the diaper shown in FIG. 1 on the skin-facing surface side. FIG. 4 is a schematic cross-sectional view taken along the line CC of FIG. FIG. 5 is a diagram corresponding to FIG. 3 of another embodiment of the absorber according to the present invention. FIG. 6 is a diagram corresponding to FIG. 3 of still another embodiment of the absorber according to the present invention. FIG. 7 is a schematic cross-sectional view of still another embodiment of the absorber according to the present invention.

Hereinafter, the disposable diaper of the present invention will be described with reference to the drawings based on the preferred embodiment thereof. 1 and 2 show the disposable diaper 1 of the present embodiment. The diaper 1 has a vertical direction X extending from the ventral side of the wearer to the dorsal side via the crotch portion and a lateral direction Y orthogonal to the vertical direction X, and the inseam M arranged in the crotch portion when worn. The ventral portion F arranged on the ventral side of the wearer with respect to the inseam M and the dorsal portion R arranged on the dorsal side of the wearer with respect to the inseam M are provided in the vertical direction X.

The diaper 1 has a vertically long shape that is long in the vertical direction X in the unfolded and extended plan view as shown in FIG. 1, the longitudinal direction thereof coincides with the vertical direction X, and the width direction coincides with the horizontal direction Y. ing. In the plan view as shown in FIG. 1, the diaper 1 has both side edges along the vertical direction X curved inward in an arc shape in the central portion of the vertical direction X including the inseam M, and is the center of the vertical direction X. The part has an hourglass shape that is tied inward. The inseam M includes an excretion portion facing portion (urination point) (not shown) that is arranged to face the excretion portion such as the wearer's penis when worn. The portion facing the excretion portion is usually located at a position slightly deviated toward the dorsal portion R from the central portion in the vertical direction X of the diaper 1.

As shown in FIGS. 1 and 2, the diaper 1 is arranged on the liquid-retaining absorber 4 and the skin-facing surface side of the absorber 4, and has a liquid permeability that can come into contact with the wearer's skin when worn. It includes a front surface sheet 2 and a liquid-impermeable or water-repellent back surface sheet 3 arranged on the non-skin facing surface side of the absorber 4. The absorber 4 is interposed and arranged between the two sheets 2 and 3. The absorber 4 has a vertically long shape that is long in the vertical direction X in a plan view as shown in FIG. 1, and straddles the vertical center line CLx that bisects the unfolded and extended diaper 1 in the vertical direction X. It extends in the vertical direction X from F to the dorsal portion R.

In the present specification, the "skin facing surface" is a surface of the absorbent article or its constituent member (for example, the absorbent body 4) that is directed toward the skin side of the wearer when the absorbent article is worn, that is, relatively worn. The side closer to the skin of the person, and the "non-skin facing surface" is the side of the absorbent article or its constituent members opposite to the skin side when the absorbent article is worn, that is, the side relatively far from the wearer's skin. It is a surface facing (the side of clothing worn by the wearer). 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.

The front surface sheet 2 and the back surface sheet 3 each have a larger size than the absorber 4, and extend outward from the peripheral edge of the absorber 4. The back sheet 3 forms the outer shape of the unfolded and stretched diaper 1 as shown in FIG. As shown in FIG. 2, the front surface sheet 2 and the back surface sheet 3 extend outward from both side edges along the vertical direction X of the absorber 4 in the lateral direction Y to form a side flap portion together with the side sheet 34 described later. is doing. The side flap portion is a portion of the diaper 1 made of a member extending outward in the lateral direction Y from the absorber 4. As the front surface sheet 2 and the back surface sheet 3, various types conventionally used for this kind 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 front surface sheet 2, and a resin film or a laminate of a resin film and a non-woven fabric or the like can be used as the back surface sheet 3. The back surface sheet 3 has, for example, a form of a liquid-impermeable film sheet alone and a form in which an exterior sheet is laminated and arranged on a non-skin facing surface of the film sheet, that is, on the outer surface side. It is a non-woven fabric.

A thread-like elastic member 31 is extended along the lateral direction Y between the front surface sheet 2 and the back surface sheet 3 at the waist portions of the ventral side portion F and the dorsal side portion R, that is, at the ends in the vertical direction X. It is fixed, so that waist gathers are formed on the waist portion when the diaper 1 is worn due to the contraction of the elastic member 31. Further, side sheets (leakage-proof cuff forming sheets) 34 are arranged on both left and right sides along the vertical direction X on the surface sheet 2 side of the diaper 1. The side sheet 34 has an inner edge portion along the vertical direction X and an outer edge portion located outside the inner edge portion in the horizontal direction Y and along the vertical direction X, and has a plane as shown in FIG. Visually, the inner edge portion overlaps with the absorber 4, and the outer edge portion extends outward from the side edge along the vertical direction X of the absorber 4 in the lateral direction Y and is joined to the back surface sheet 3. A thread-like elastic member 32 is fixed in an extended state along the vertical direction X between the side seat 34 and the back seat 3 in the left and right leg portions arranged around the wearer's legs. A pair of leak-proof cuffs are formed on the leg portion when the diaper 1 is worn due to the contraction of the elastic member 32. Further, a thread-like elastic member 33 is fixed to the inner edge of the side sheet 34 in an extended state along the vertical direction X, whereby at least the inseam M due to the contraction of the elastic member 33 when the diaper 1 is worn. A leak-proof cuff is formed on. The front surface sheet 2, the back surface sheet 3, the absorber 4, the elastic members 31, 32, 33 and the side sheet 34 are bonded to each other by a known bonding means such as a hot melt type adhesive.

The diaper 1 is a so-called deployable disposable diaper, and as shown in FIG. 1, a pair of fastening tapes 35 are formed on both side edges (the side flaps) of the dorsal portion R of the diaper 1 along the vertical direction X. , 35 are provided. A fastening portion (not shown) made of a male member of a mechanical hook-and-loop fastener is attached to the fastening tape 35. Further, a landing region 36 made of a female member of a mechanical hook-and-loop fastener is formed on the non-skin facing surface of the ventral side F of the diaper 1. In the adhered region 36, a female member of a mechanical hook-and-loop fastener is attached to the non-skin facing surface of the back surface sheet 3 forming the non-skin facing surface of the ventral side F by a known joining means such as an adhesive or a heat seal. It is formed by joining and fixing, and the fastening portion of the fastening tape 35 can be detachably fastened. When wearing the diaper 1, the side flap portion of the dorsal side portion R is extended to the ventral side of the wearer, and the fastening tapes 35 and 35 provided on the side flaps are covered with the outer surface of the ventral side portion F. It stops at the landing area 36.

FIG. 3 shows the skin-facing surface side of the absorber 4. The absorber 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. It is configured to include a side core wrap sheet 42. The absorbent core 40 and the core wrap sheets 41 and 42 are bonded by a known bonding means such as a hot melt type adhesive. In the present embodiment, the absorbent core 40 has a single-layer structure and has a vertically long shape that is long in the vertical direction X in a plan view as shown in FIG.

The absorbent core 40 is formed by accumulating core-forming materials including an absorbent material. As the absorbent material, those usually used as a material for forming this kind of absorbent core can be used without particular limitation, and for example, a fiber material such as wood pulp or a synthetic fiber treated with a hydrophilic agent (preferably). (Hydrophilic fiber) and water-absorbent polymer can be mentioned. The absorbent core 40 may be an aggregate of fiber materials, or a particulate water-absorbent polymer supported on the aggregate.

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. As an example of the form of 1) above, one continuous core wrap sheet having a width of 2 times or more and 3 times or less the length (width) of the absorbent core 40 in the lateral direction is the skin of the absorbent core 40. It covers the entire surface of the facing surface and extends outward in the lateral direction Y from both side edges along the vertical direction X of the absorbent core 40, and the extending portion is wound below the absorbent core 40. Examples thereof include a form that covers the entire non-skin facing surface of the absorbent core 40. In this one core wrap sheet, the portion covering the skin facing surface of the absorbent core 40 is the skin side core wrap sheet 41, and the portion covering the non-skin facing surface of the absorbent core 40 is the non-skin side core wrap. Sheet 42.

In the case of 2) above, the length in the lateral direction Y, that is, the width may be the same or different between the skin side core wrap sheet 41 and the non-skin side core wrap sheet 42. If the widths of both sheets 41 and 42 are different, whichever is longer may be used. 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, and is not. 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 width direction Y from both side edges along the vertical direction X of the absorbent core 40. The extending portion thereof may be rolled up on a skin-side core wrap sheet 41 arranged to face the skin-facing surface of the absorbent core 40, and may cover both side edges of the sheet 41 along the vertical direction X. ..

As the core wrap sheets 41 and 42, liquid permeable sheets can be used, and examples thereof include paper and non-woven fabric. However, a non-woven fabric is preferable as both the sheets 41 and 42 from the viewpoint of surely preventing the core wrap sheets 41 and 42 from being torn and surely joining the two sheets 41 and 42 to each other in the non-integrated portions 5 and 6 described later. The non-woven fabric has higher strength than paper and is not easily torn during processing, and when the water-absorbent polymer particles are used as the core forming material constituting the absorbent core, the non-woven fabric is absorbent due to the swelling of the water-absorbent polymer particles. It can flexibly respond to the deformation of the core. As the non-woven fabric, those manufactured by various manufacturing methods can be used without particular limitation. Further, as the non-woven fabric, a hydrophilic non-woven fabric made of synthetic fibers subjected to a hydrophilization treatment is preferable.

The thickness of the absorbent core 40 (thickness of portions other than the non-integrated portions 5 and 6 described later) is preferably 1 mm or more, more preferably 2 mm or more, and preferably 10 mm or less, still more preferably 6 mm or less.
The basis weight of the absorbent core 40 (the basis weight of the portion other than the non-integrated portions 5 and 6 described later) is preferably 250 g / m ² or more, more preferably 350 g / m ² or more, and preferably 600 g / m ² . Below, it is more preferably 500 g / m ² or less.
The basis weight of the core wrap sheets 41 and 42 (the basis weight of the portion other than the non-integrated portions 5 and 6 described later) is preferably 5 g / m ² or more, more preferably 7 g / m ² or more, and preferably 20 g / m. It is m ² or less, more preferably 15 g / m ² or less.
The thickness of the diaper 1 or the constituent members of the diaper 1 (absorbent core 40, surface sheet 2, etc.) is measured by the following method.

<Measuring method of thickness of disposable diapers or their constituent members>
Place the object to be measured on a horizontal surface without wrinkles or bends, and measure the thickness of the object to be measured under a load of 5 cN / cm ² . Specifically, for measuring the thickness, for example, a thickness meter PEACOCK DIAL UPRIGHT GAUGES R5-C (manufactured by OZAKI MFG.CO.LTD.) Is used. At this time, a plan-viewing circular or square plate (thickness) whose size is adjusted so that the load on the measurement object is 5 cN / cm ² between the tip of the thickness gauge and the cut-out object to be measured. (Acrylic plate of about 5 mm) is placed and the thickness is measured. In the thickness measurement, 10 points are measured, and the average value thereof is calculated to obtain the thickness of the object to be measured.

The absorbent core 40 is formed with a plurality of non-integrated portions indicated by reference numerals 5 and 6 in the figure. As shown in FIG. 3, the plurality of non-integrated portions 5 and 6 include a main non-integrated portion 5 extending in the vertical direction X at the central portion in the lateral direction Y of the absorbent core 40, and the main non-integrated portion 5. Includes an auxiliary non-integrating portion 6 extending outward in the lateral direction Y from 5. The main non-integrated portion 5 and the auxiliary non-integrated portion 6 are connected to each other to form one continuous non-integrated portion.

The main non-integrated portion 5 constitutes an absorbent core 40 and is a portion in which a core forming material including an absorbent material such as a fiber material or a water-absorbing polymer is not integrated, and the core forming material in the main non-integrated portion 5 is not integrated. The basis weight of is virtually zero. The main non-integrated portion 5 can be said to be a through hole penetrating the absorbent core 40 in the thickness direction. The main non-accumulating portion 5 functions as a conduit for excrement liquid such as urine, and has an action of diffusing the excretion liquid in the vertical direction X, which is the extending direction thereof. The above-mentioned "substantially zero basis weight" includes a form in which a very small amount of the core forming material is present in the main non-integrated portion 5 due to unintentional mixing of the core forming material. .. However, in such a form, the amount of the core forming material present in the main non-integrated portion 5 is described later in "Joining the skin-side core wrap sheet 41 and the non-skin-side core wrap sheet 42 in the main non-integrated portion 5". Is not disturbed.

On the other hand, as the auxiliary non-integrated portion 6, in addition to the form of the through hole as in the main non-integrated portion 5, there may be a form in which a smaller amount of core forming material is present than in other regions of the absorbent core 40. .. This is because the auxiliary non-accumulation portion 6 made of such a small amount of accumulation portion also has the same effect (liquid diffusion action, etc.) as that of the auxiliary non-accumulation portion 6 made of through holes. The basis weight of the auxiliary non-accumulation portion 6 including such a small amount of accumulation portion is preferably 300 g / m ² or less, more preferably 250 g / m ² or less. When the auxiliary non-integrated portion 6 is such a small amount integrated portion, the auxiliary non-integrated portion 6 usually does not join the skin-side core wrap sheet 41 and the non-skin-side core wrap sheet 42, which will be described later. .. Considering the liquid diffusion effect and the like, the auxiliary non-accumulation portion 6 composed of through holes is preferable to the auxiliary non-accumulation portion 6 consisting of a small amount of accumulation portion. As shown in FIG. 2B, the auxiliary non-integrated portion 6 in the present embodiment is a through hole penetrating the absorbent core 40 in the thickness direction, and is the same as the main non-integrated portion 5.

The non-integrated portions 5 and 6 (non-integrated portions composed of through holes) are sites formed by intentionally inhibiting the accumulation of the core forming material in the process of accumulating the core forming material at the time of manufacturing the absorbent core 40. be. The absorbent core 40 having the non-integrated portions 5 and 6 can be manufactured according to a conventionally known method for manufacturing an absorbent core. Specifically, for example, using a fiber stacking device, a core forming material (absorbent material) supplied on an air stream is sucked and deposited on a molding die formed on the outer peripheral surface of a rotary drum to absorb the material. In the method of obtaining the core 40, it can be manufactured by using a molding die having a predetermined pattern as the molding die, for example, a molding die in which a portion corresponding to the non-integrated portions 5 and 6 protrudes upward with respect to the peripheral portion. can. In the absorbent core 40 obtained by such a method, the portions where the core forming material does not exist are the non-integrated portions 5 and 6. As another manufacturing method of the absorbent core 40 having the non-integrated portions 5 and 6, an absorbent core having no non-integrated portions 5 and 6 is manufactured, and a die-cutting process is performed on a predetermined portion of the absorbent core. It is also possible to adopt a method of forming the non-integrated portions 5 and 6 by performing post-processing such as cutting or cutting. Further, the absorbent core having the above-mentioned "auxiliary non-accumulation part 6 composed of a small amount of accumulation part" can also be manufactured according to the above-mentioned method.

As shown in FIG. 2, in the main non-integrated portion 5, the skin-side core wrap sheet 41 and the non-skin-side core wrap sheet 42 are joined. With such a configuration, the adhesion between the absorbent core 40 and both sheets 41 and 42 is improved, so that the shape-retaining property of the absorbent core 40 interposed between both sheets 41 and 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 constituting the 40 swells by absorbing the excrement liquid such as urine, the degree of deformation of the absorbent core 40 is suppressed. Further, the skin-side core wrap sheet 41 is bonded to the front surface sheet 2 with an adhesive, and the non-skin-side core wrap sheet 42 is bonded to the back surface 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 front surface sheet 2 and the back surface sheet 3 while wearing the diaper 1. Therefore, the absorber 4 (absorbent core 40) is not easily broken during the use of the diaper 1, and excellent absorption performance can be stably exhibited. Further, with such a configuration, the take-up of excrement liquid by the absorbent core 40 is improved, and the burial of the main non-accumulated portion 5 due to the swelling of the absorbent material contained in the core forming material is effectively prevented. ..

In the present embodiment, as described above, the auxiliary non-integrated portion 6 is also a through hole like the main non-integrated portion 5, but as shown in FIG. 2 (b), in the auxiliary non-integrated portion 6 of the through hole. The skin side core wrap sheet 41 and the non-skin side core wrap sheet 42 are joined. It is not essential that both sheets 41 and 42 are joined in the auxiliary non-integrated portion 6, but the joining is made so that both sheets 41 and 42 are joined in the main non-integrated portion 5. In combination with this, it is preferable because the action and effect (improvement of shape retention of the absorbent core 40, etc.) due to the joining of both sheets 41 and 42 can be more reliably achieved.

The joining method of both sheets 41 and 42 in the non-integrated portions 5 and 6 is not particularly limited, and for example, an adhesive such as a hot melt type adhesive or a known joining method such as fusion can be used. The joints of both sheets 41 and 42 in the non-integrated portions 5 and 6 can be formed, for example, as follows. That is, an adhesive such as a hot melt type adhesive is previously applied to the corresponding positions of the non-integrated portions 5 and 6 on at least one of both sheets 41 and 42, and the absorbent core 40 is covered with both sheets 41 and 42. After obtaining the absorber 4, the non-integrated portions 5 and 6 of the absorber 4 are pressed from the skin facing surface and / or the non-skin facing surface side to push one or both of the sheets 41 and 42. Both sheets 41 and 42 can be joined in the non-integrated portions 5 and 6. As the pressing process, known embossing such as embossing with or without heat or ultrasonic embossing can be adopted. When a heat-pressurizing treatment such as embossing with heat is adopted as the pressing treatment, both sheets 41 and 42 are heat-bonded to each other, so that both sheets 41 and 42 are combined with the adhesive force of the adhesive. They can be firmly joined together.

In particular, when the core wrap sheets 41 and 42 are non-woven fabrics composed of fibers containing polypropylene (PP) resin, particularly non-woven fabrics made of only PP, both sheets 41 in the non-integrated portions 5 and 6 are described above. , 42 can be joined only by pressing the sheets 41 and 42 without heating or melting the resin such as ultrasonic waves and without using an adhesive. Since sufficient bonding strength can be obtained at the bonding portion of 42, it is advantageous in terms of processing suitability, manufacturing cost, and the like.

In the present embodiment, the joint portion of both sheets 41 and 42 in the non-integrated portions 5 and 6 is located at the central portion in the thickness direction of the absorber 4, as shown in FIG. 2, and therefore both sheets 41. , 42 are concavely recessed at the formation positions of the non-integrated portions 5 and 6, respectively. Such a form of the joint portion of both sheets 41 and 42 can be obtained by simultaneously pressing both sheets 41 and 42 at the formation positions of the non-integrated portions 5 and 6 in the above-mentioned method for forming the joint portion. The position of the joint portion of both sheets 41 and 42 in the non-integrated portions 5 and 6 does not have to be the central portion in the thickness direction of the absorber 4, and is unevenly distributed on the skin facing surface side, that is, the surface sheet 2 side. It may be unevenly distributed on the non-skin facing surface side, that is, on the back surface sheet 3 side. In the former case, the skin-side core wrap sheet 41 is flat, but the non-skin-side core wrap sheet 42 is recessed at the positions where the non-integrated portions 5 and 6 are formed. In the latter case, the non-skin side core wrap sheet 42 is flat, but the skin side core wrap sheet 41 is concavely recessed at the formation positions of the non-integrated portions 5 and 6.

In the non-integrated portions 5 and 6, both sheets 41 and 42 need only be joined in at least a part of each of the non-integrated portions 5 and 6, and are not joined over the entire area of each of the non-integrated portions 5 and 6. However, from the viewpoint of stably exerting the action and effect of the non-integrated portions 5 and 6, "the area of the joint portion of both sheets 41 and 42 occupying the area of each of the non-integrated portions 5 and 6" The higher the ratio (joint area occupancy) is, the more preferable it is, specifically, it is preferably 70% or more, more preferably 80% or more, and ideally 100%. In the present embodiment, as shown in FIGS. 1 and 3, the non-integrated portions 5 and 6 have a long shape in one direction (vertical direction X) in a plan view, specifically, a rectangular shape. Both sheets 41 and 42 are continuous over the vertical X, that is, the total length in the longitudinal direction of each of the rectangular non-integrated portions 5 and 6. The "total length" here means the total length of the non-integrated portions 5 and 6 in the vertical direction X and the length equivalent thereto, and specifically, means 90% or more of the total length of the non-integrated portions 5 and 6. do.

The diaper 1 is characterized in terms of the arrangement pattern of the plurality of non-integrated portions 5, 6 in the absorbent core 40. That is, when the regions I to V are set in the diaper 1 according to the following <method for determining regions I to V>, the main non-integrated portion 5 exists in the regions II and III, and the auxiliary non-accumulated portion 6 is present in the region II. exist.

<Method of determining areas I to V>
In the unfolded and stretched diaper 1 (see FIG. 1), as shown in FIG. 3, one virtual extending in the horizontal direction Y through the vertical end (front end) 4F on the ventral side F side of the absorber 4. A straight line is defined as a reference line V1, and five virtual straight lines V2 to V6 parallel to the reference line V1 are drawn at equal intervals Sx on the dorsal side R side of the reference line V1. The interval Sx between the virtual straight lines V1 to V6 divides the vertical length Lx from the vertical center line CLx that bisects the expanded and extended diaper 1 in the vertical direction X to the front end 4F of the absorber 4 by 5. Then, the value is doubled. The regions divided into five by these six virtual straight lines V1 to V6 are designated as region I, region II, region III, region IV, and region V in order from the one closest to the reference line V1.

Since the regions I to V determined by the determination method are mainly used for specifying the positions of the non-integrated portions 5 and 6 in the absorber 4 (absorbable core 40), these regions are used. It is also considered appropriate to set the virtual straight lines V1 to V6 to be divided based on the dimensions of the absorber 4 (the length in the vertical direction X). However, in the present invention, as described above, not in the absorber 4, but in the expanded and stretched diaper 1 as shown in FIG. 1, the diaper 1 is bisected in the vertical direction X based on the length of the vertical direction X. Virtual straight lines V1 to V6 are set with reference to the vertical center line CLx. The reason is that the positions of the non-accumulated portions 5 and 6 should be determined based on the absorption site of excrement such as urine in the absorber 4 when the diaper 1 is worn. This is because it cannot be specified only by the dimensions of the absorber 4, and it is necessary to consider the position of the absorber 4 in the diaper 1. If the absorber is always arranged in the vertical center of the expanded and stretched diaper, there is almost no problem in setting the virtual straight lines V1 to V6 based on the vertical length of the absorber. It is conceivable that the positions of the absorbers in the diaper are various, and for example, in the diaper 1, the absorbers 4 may be unevenly distributed on the ventral side F side of the diaper 1. In that case, since the center of the absorber 4 in the vertical direction X does not match that of the diaper 1 in the expanded and extended state, the regions I to V are determined based on the length of the vertical X of the absorber 4. However, each region thus determined may not reflect the site where the excrement is actually absorbed in the absorber 4, and as a result, the non-accumulated portions 5 and 6 are formed at appropriate positions. It can be difficult to do. Therefore, in the present invention, the virtual straight lines V1 to V6 are set and the regions I to V are determined based on the vertical length of the disposable diaper in the expanded and extended state.

In the determination method, the "vertical end (front end) 4F of the absorber 4" through which the reference line V1 passes is the closest to the waist end 1F on the ventral side F side of the diaper 1 among the constituent members of the absorber 4. It is the vertical end. Therefore, for example, when the core wrap sheets 41 and 42 extend from the vertical end (front end) on the ventral side F side of the absorbent core 40 to the waist end 1F side, the absorbent cores 41 and 42 are both absorbent. The tip of the extending portion from the front end of the core 40 is the front end 4F of the absorber 4. In the present embodiment, all the constituent members of the absorber 4, that is, the lengths of the absorbent core 40 and the skin-side core wrap sheet 41 and the non-skin-side core wrap sheet 42 in the vertical direction X are the same as each other, and therefore absorb. The front end 4F of the body 4 coincides with the vertical end (front end) on the ventral side F side of each of these three components.

Further, in the present embodiment, as shown in FIG. 3, the length of the absorber 4 in the vertical direction X is the same as the length of the regions I to V in the vertical direction X, and the absorber 4 has the region I in the vertical direction X. It is divided into five equal parts. However, the absorber 4 is not limited to this, and the present invention includes a form in which the length of the absorber 4 in the vertical direction X is different from the length of the regions I to V in the vertical direction X. Specifically, 1) a form in which the length of the vertical X of the absorber 4 is shorter than the length of the vertical X of the regions I to V, that is, the vertical end (rear) on the back side R side of the absorber 4. End) 4R is located closer to the front end 4F of the absorber 4 than the virtual straight line V6, and 2) the length of the absorber 4 in the vertical direction X is longer than the length of the vertical direction X of the regions I to V. That is, the rear end 4R of the absorber 4 is located farther from the front end 4F of the absorber 4 than the virtual straight line V6. In the typical case of the absorber 4 (absorbable core 40) in the form of 1) above, the rear end 4R of the absorber 4 is located between the virtual straight lines V5 and V6 or between the virtual straight lines V4 and V5. do.

Further, in the present embodiment, as shown in FIG. 3, one absorber 4 (expanded and stretched diaper 1) is bisected in the horizontal direction Y and one on the horizontal center line CLY extending in the vertical direction X. The main non-integrated portion 5 extends continuously in the vertical direction X, and a plurality of (16 in this embodiment) auxiliary non-integrated portions 6 extend from the main non-integrated portion 5. Further, a plurality of (two in this embodiment) auxiliary non-integrating portions 6 extend from one location in the vertical direction X in the main non-integrating portion 5 in different directions. In the main non-integrated portion 5, there are eight locations that serve as starting points for such a plurality (two) auxiliary non-integrated portions 6, and one from each of the eight starting points on both outer sides of the lateral direction Y. The auxiliary non-integrated portions 6 are extended to form a pair of two auxiliary non-integrated portions 6 for each starting point. These plurality (8 to 16) auxiliary non-integrated portions 6 are formed line-symmetrically with the main non-integrated portion 5 as the axis of symmetry.

Further, in the present embodiment, the non-integrated portions 5 and 6 each have a rectangular shape in a plan view of the absorber 4 as shown in FIG. The longitudinal direction of the main non-integrated portion 5 coincides with the vertical direction X, and the longitudinal direction of the auxiliary non-integrated portion 6 coincides with the lateral direction Y. The plurality of auxiliary non-integrated portions 6 have the same shape and the same dimensions in a plan view.

In the diaper 1, regions II and III are regions in which the excretion portion facing portion (urination point), which is a site where the wearer first receives excretion fluid such as urine, is present, and the excretion fluid is concentrated and absorbed. The body utilization rate is particularly high. In the absorber 4 in such regions II and III, the non-accumulated portions 5 and 6 that function as a conduit for excretory fluid such as urine are present, so that the excretory fluid is spread by the non-accumulated portions 5 and 6. It is diffused in the existing direction, and uniform absorption of the absorber 4 is achieved. In particular, in the regions II and III, the presence of the main non-accumulation portion 5 extending in the vertical direction X at the central portion of the horizontal direction Y of the absorptive core 40 promotes the diffusion of the excrement liquid in the vertical direction X. Further, the presence of the auxiliary non-accumulation portion 6 extending outward in the lateral direction Y from the main non-accumulation portion 5 in the region II promotes the diffusion of the excrement liquid in the lateral direction Y, and these Combined with the liquid diffusion action, the uniform absorbency of the absorber 4 is improved.

In particular, in the present embodiment, as shown in FIG. 3, the main non-integrated portion 5 exists not only in regions II and III but also in regions I and IV, and more specifically, regions I to regions. It is continuously extended over IV. With such a configuration, the excrement liquid is efficiently diffused into the regions I to IV by the main non-accumulation portion 5, so that the uniform absorbability of the absorber 4 is improved and the utilization rate of the absorber can be expected to be improved. Further, in the present embodiment, the main non-accumulation portion 5 is present in the regions I to IV where the probability of the presence of urine is relatively high, and the skin-side core wrap sheet 41 and the non-skin-side core are present in the main non-accumulation portion 5. Since it is joined to the wrap sheet 42, the absorbent core 40 is unlikely to break even in a wet state.

In the present embodiment, as shown in FIG. 3, the absorbent core 40 has a longer lateral length (width) in the region I or II than the portion located in the region III in the absorbent core 40. , Has a wide portion 40W. In the illustrated embodiment, the wide portion 40W exists in both the regions I and II, and exists across both regions. The wide portion 40W is a portion having more absorbent material than the portion located in the region III in the absorbent core 40, and is a portion having a relatively large liquid absorption capacity. The presence of 5 and 6 can be expected to further improve the absorber utilization rate.

Further, in the present embodiment, as shown in FIG. 3, the non-integrated portions 5 and 6 all extend continuously in a predetermined direction. As shown in the figure, the term "continuously extending" means not only a form in which the non-integrated portion is continuous without interruption in one direction, but also a small non-integrated portion having a relatively short length in one direction. A plurality of intermittently arranged forms with a slight interval (preferably 5 mm or less) in one direction are included. Strictly speaking, the latter form, that is, the non-integrated portion consisting of an aggregate of small non-integrated portions, is discontinuous in one direction, but the intervals between the small non-integrated portions are narrow and substantially continuous in one direction. Therefore, it can function as a conduit for excretory fluid.

Further, in the diaper 1, the total area S1 of the auxiliary non-integrated portion 6 existing in the regions II and III is larger than the total area S2 of the auxiliary non-integrated portion 6 existing in the regions I and IV. The total areas S1 and S2 mean the total area of each auxiliary non-integrated portion 6 on the skin facing surface of the absorber 4 (skin facing surface of the skin side core wrap sheet 41). In the present embodiment, as shown in FIG. 3, the number of auxiliary non-integrated portions 6 in each region is 6 to 12 in each of regions II and III, and 1 to 2 in each of regions I and IV. Since the areas of the plurality of auxiliary non-integrated portions 6 are the same as each other, the magnitude relationship of "total area S1> total area S2" is established. By establishing such a magnitude relationship, the diffusivity of the excrement fluid in the lateral direction Y is improved, so that the excretory fluid that tends to concentrate in the central portion of the lateral direction Y of the absorber 4 is outside the lateral direction Y. It becomes possible to diffuse the mixture quickly, and the uniform absorbency of the absorber 4 is improved. The ratio of the total area S1 to the total area S2 is preferably 1.5 or more, more preferably 2.0 or more, and preferably 2.0 or more, as the total area S1 / total area S2 on the premise that the total area S1> the total area S2. Is 5.0 or less, more preferably 4.0 or less.

Further, since the central portion of the absorber 4 in the regions II and III in the lateral direction Y is a portion where the excrement liquid is particularly concentrated, the swelling tends to be larger than that of the peripheral portion after the liquid is absorbed. The occurrence of partial swelling in the absorbent body 4 may give the viewer the impression that uniform absorption has not been performed, which may lead to a decrease in reliability of the disposable diaper product. On the other hand, in the diaper 1, the main non-integrated portion 5 in which the core forming material does not exist in the central portion of the absorber 4 in the lateral direction Y in the regions II and III, which is a portion where the swelling due to liquid absorption tends to be large. Is formed, and the liquid can be transferred in the vertical direction X (front-back direction), so that such an inconvenience is unlikely to occur.

However, since the main non-integrated portion 5 is a portion in which the core forming material does not exist, for example, when the absorber 4 is visually observed from the outside before the diaper 1 is used, the absorber 4 is formed at the formed position of the main non-integrated portion 5. 4 seems to be fragmented, and some observers may question the performance primarily performed by the absorber 4, such as liquid absorbency. This situation also applies to the auxiliary non-accumulation unit 6. Therefore, it is desirable that the non-integrated portions 5 and 6 are as inconspicuous as possible within the range in which the above-mentioned effects can be exerted. From such a viewpoint, the length (width) of the non-integrated portions 5 and 6 in the lateral direction Y is preferably 5 mm or less. The width of the non-integrated portions 5 and 6 is preferably 1 mm or more, more preferably 1 mm or more, from the viewpoint of the balance between the expression of the predetermined action and effect by the non-integrated portions 5 and 6 and the inconspicuousness of the non-integrated portions 5 and 6. Is 2 mm or more, preferably 5 mm or less, and more preferably 4 mm or less. The widths of the non-integrated portions 5 and 6 may be the same or different from each other. The "width" (length in the horizontal direction Y) of the non-integrated portions 5 and 6 referred to here means the maximum width when the width is not constant in the vertical direction X. Similarly, the width of the non-integrated portions 5 and 6 means the maximum width when the width differs between the skin facing surface and the non-skin facing surface of the absorber 4.

In addition, when the diaper 1 is worn, the absorber 4 is usually sandwiched between the wearer's thighs in the regions II and III, and therefore, the absorbent body 4 is the main body of the absorber 4 in the regions II and III. The sex core 40 is fragile due to an external force caused by the movement of the wearer. In particular, when the absorbent core 40 absorbs the excrement liquid and becomes wet, and the strength is lowered or the weight is increased as compared with the dry state, the absorbent core 40 is in a more fragile state and receives an external force. There is a concern that it will be divided into multiple chunks. On the other hand, in the present embodiment, as described above, the skin-side core wrap sheet 41 and the non-skin-side core wrap sheet 42 are joined not only in the main non-integrated portion 5 but also in the auxiliary non-integrated portion 6. As a result, the absorbent core 40 is firmly restrained by both sheets 41 and 42 at a plurality of locations of regions II and III, so that the absorbent core 40 is less likely to break even in a wet state. In particular, the auxiliary non-integrated portion 6 having a relatively short length in the vertical direction X plays a major role in preventing the absorbent core 40 from breaking, and the auxiliary non-integrated portion 6 is the main non-integrated portion. Since a plurality of pairs are formed line-symmetrically with 5 as the axis of symmetry, breakage of the absorbent core 40 is effectively prevented.

On the other hand, the region V is the region farthest from the regions II and III in which the excretion portion facing portion exists and has a low absorber utilization rate. Therefore, from the viewpoint of improving the absorption performance of the absorber 4, the region V is a region. There is little need to diffuse the excrement to such a region V. Rather, if the non-integrated portions 5 and 6 in which the core forming material does not exist are provided in the region V, the non-accumulated portions 5 and 6 are provided before the diaper 1 is used. The user recognizes the step of the absorber 4 due to the absence of the core forming material at the forming position of 6, and the user does not have uniform absorption due to the step, and the absorber is divided, which is unnecessary anxiety. There is a risk of giving. Therefore, as shown in FIG. 3, the non-integrated portions 5 and 6 do not exist in the region V. It is important that the non-integrated portions 5 and 6 are arranged only in the minimum necessary portions from the viewpoint of uniform absorption and prevention of breakage of the absorber.

The plan view shape of the main non-integrated portion 5 is not limited to the rectangular shape as shown in FIG. 3, and may be a shape long in the vertical direction X, for example, an elliptical shape, a rhombus shape, or a polygonal shape having a pentagon or more. good. The length of the main non-integrated portion 5 in the vertical direction X is the vertical direction of the absorbent core 40 from the viewpoint of the balance between the manifestation of a predetermined action and effect by the non-integrated portion 5 and the inconspicuousness of the non-integrated portion 5. With respect to the length of X, it is preferably 40% or more, more preferably 50% or more, and preferably 80% or less, still more preferably 70% or less. Further, from the viewpoint of preventing leakage, it is preferable that the vertical end of the main non-integrated portion 5 does not reach the vertical end of the absorbent core 40, that is, the vertical end of the main non-integrated portion 5. The directional end is preferably a closed end as shown in FIG. 3, rather than an open end.

FIG. 4 shows a cross section of the main non-integrated portion 5 in the absorber 4 shown in FIG. 3 and its vicinity along the lateral direction Y. In the present embodiment, as shown in FIG. 4, the absorber 4 is laterally oriented from the main non-integrated portion 5 on both sides of the main non-integrated portion 5 (joint portion of the core wrap sheets 41 and 42) in the lateral direction Y. It has a gradation region 4G in which the basis weight of the absorber 4 (absorbent core 40) gradually increases toward the outside of Y (away from the main non-integrated portion 5). The gradation region 4G is adjacent to the main non-integrated portion 5 and exists in the non-existent portion of the auxiliary non-integrated portion 6 at the side edge of the main non-integrated portion 5 along the vertical direction X. Further, the gradation region 4G does not reach both ends of the absorber 4 in the horizontal direction Y (both edges along the vertical direction X), and is between the main non-integrated portion 5 and the region where the basis weight of the absorber 4 is constant. It is sandwiched between. When the absorber 4 has such a gradation region 4G, the effect that the presence of the main non-integrated portion 5 becomes inconspicuous can be expected.

From the viewpoint of ensuring that the action and effect of the gradation region 4G are more reliably performed, the length (width) 4GW (see FIG. 4) of the lateral Y of the gradation region 4G is the length of the lateral Y of the main non-integrated portion 5. It is preferable that the width is longer than 5W (see FIG. 4), and in particular, the width 4GW is larger than the value obtained by doubling the width 5W, that is, the magnitude relationship of "4GW> (5W x 2)" is established. It is preferable to do so. The ratio of the two is preferably 1.5 or more, more preferably 2.0 or more, and preferably 5.0 or less, still more preferably 4. It is 0 or less.

The plan view shape of the auxiliary non-integrating portion 6 is not limited to the rectangular shape as shown in FIG. 3, and may be a shape long in a predetermined direction, for example, an ellipse, a rhombus, or a polygonal shape of pentagon or more. But it may be. The length in the longitudinal direction of the auxiliary non-integrated portion 6 (the length in the horizontal direction Y in the present embodiment) is the length in the longitudinal direction of the main non-integrated portion 5 (the length in the vertical direction X in the present embodiment). On the other hand, it is preferably 1/5 or less, more preferably 1/6 or less.

Further, from the viewpoint of making the non-integrated portions 5 and 6 as inconspicuous as possible, the surface sheet 2 located in the region where the non-integrated portions 5 and 6 exist is the non-integrated portion 5 and 6 in which the core forming material is not integrated. It is preferable to have a high basis weight and a thick wall so that the dents formed corresponding to the above can be filled and the non-integrated portions 5 and 6 can be visually concealed. Specifically, the surface sheet 2 located in the region where the non-integrated portions 5 and 6 are present has a basis weight of preferably 30 g / m ² or more, more preferably 35 g / m ² or more, and a thickness of preferably 0. It is 0.7 mm or more, more preferably 1.0 mm or more. In the present embodiment, as shown in FIG. 3, the non-integrated portions 5 and 6 are present in the regions I to IV, so that the surface sheet 2 has such a high basis weight and wall thickness at least in the regions I to IV. The entire surface sheet 2 including the region V may have such a high basis weight and a wall thickness. Regarding the upper limit of the basis weight and thickness of the surface sheet 2 located in the region where the non-integrated portions 5 and 6 exist, the basis weight is determined from the viewpoint of imparting practically sufficient strength to the surface sheet 2. It is preferably 50 g / m ² or less, more preferably 40 g / m ² or less, and the thickness is preferably 5 mm or less, further preferably 3 mm or less. Further, the surface sheet 2 may be composed of one sheet, or may be a laminated structure of a plurality of sheets formed by stacking a plurality of sheets. From the viewpoint of making the non-integrated portions 5 and 6 inconspicuous and from the viewpoint of cost, the surface sheet 2 has a laminated structure of two sheets and has a three-dimensional uneven structure on at least one surface (skin facing surface). A non-woven fabric having the above is preferable.

Hereinafter, other embodiments of the present invention will be described with reference to the drawings. Regarding other embodiments described later, components different from the above-mentioned diaper 1 (absorbent body 4) will be mainly described, and similar components will be designated by the same reference numerals and description thereof will be omitted. The description of the diaper 1 (absorber 4) is appropriately applied to the components not particularly described.

In the absorber 4A shown in FIG. 5, at least one of the auxiliary non-integrated portions 6 existing in the regions I and II virtually extends the auxiliary non-integrated portion 6 toward the direction away from the main non-integrated portion 5. In this case, the virtual extension line (not shown) intersects the reference line V1 and the angle θ formed with the lateral direction Y is 10 degrees or more and less than 90 degrees. In the absorber 4A, as shown in FIG. 5, 6 to 12 auxiliary non-integrated portions 6 are formed over the regions I to IV, and all of the plurality of auxiliary non-integrated portions 6 are as described above. In addition, the virtual extension line intersects the reference line V1 and the angle θ formed with the lateral direction Y is 10 degrees or more and less than 90 degrees. "The virtual extension line of the auxiliary non-integrated portion 6 intersects the reference line V1" means that the auxiliary non-integrated portion 6 is from the main non-integrated portion 5 to the front end 4F of the absorber 4 (on the ventral side F side of the diaper 1). It means that it extends diagonally toward the waist end 1F) side. Since the auxiliary non-accumulation portion 6 extends in the ventral direction from the main non-accumulation portion 5 in this way, it becomes possible to actively diffuse the excrement liquid such as urine to the ventral side F and absorb it. The body utilization rate will be further improved. Particularly in the absorber 4A, the absorbent core 40 has a wide portion 40 W in the regions I and II, and the liquid absorption capacity of the absorber 4A is larger than that in other regions such as the region III. The presence of the auxiliary non-accumulation portion 6 extending in the ventral direction in such regions I and II (wide portion 40W) is advantageous in terms of improving the absorber utilization rate.

In the absorber 4B shown in FIG. 6, 5 to 10 auxiliary non-integrated portions 6 having different positions in the vertical direction X are formed, and among the plurality of auxiliary non-integrated portions 6, the main non-integrated portion 5 or its own. The angle formed by the virtual extension line (corresponding to the lateral center line CLy in the figure) and the angle α increasing from the ventral side F side toward the dorsal side R side is 90 degrees or the closest to 90 degrees. 1) The specific auxiliary non-accumulation part 60 exists in the region II or III, and 2) the ventral F side of the absorber 4 is located more than the specific auxiliary non-accumulation part 60. The auxiliary non-integrated portion 6 (hereinafter, also referred to as “ventral auxiliary non-integrated portion 61”) near the vertical end (front end) 4F has an angle α smaller than that of the specified auxiliary non-integrated portion 60, and 3). The auxiliary non-integrated portion 6 (hereinafter, also referred to as “dorsal auxiliary non-integrated portion 62”) closer to the vertical end (rear end) 4R on the dorsal side R side of the absorber 4 than the specific auxiliary non-integrated portion 60 is The angle α is larger than that of the specific auxiliary non-integrated portion 60.

According to the absorber 4B having such a configuration, the excrement liquid such as urine received at the central portion (the portion facing the excretion portion) in the lateral direction Y of the region II or III is mainly laterally distributed by the specific auxiliary non-accumulation portion 60. It is diffused substantially parallel to the direction Y, mainly ventral (anterior) by the ventral auxiliary non-accumulation portion 61, and mainly dorsal (rear) by the dorsal auxiliary non-accumulation portion 62. Therefore, the uniform absorbency of the absorber 4B and the utilization rate of the absorber can be improved. Further, particularly in the present embodiment, as shown in FIG. 6, the non-integrated portions 5 and 6 are not arranged in the region V which is a portion where the absorber utilization rate is relatively low, and are uniformly absorbent and have an absorber. Since it is limited to the minimum necessary parts (parts centered on areas II and III) from the viewpoint of preventing breakage of the diaper, uniform absorption is performed without giving unnecessary anxiety to the user of diaper 1. The sex and absorber utilization rate are increased. The angle α formed by each of the non-integrated portions 61 and 62 with the main non-integrated portion 5 or its virtual extension line can be appropriately set in the range of 10 degrees or more and less than 90 degrees, and the non-integrated portions 61 and 62 can be set to each other. The angles α may be different from each other.

In the absorber 4C shown in FIG. 7, the length (width) of the main non-integrated portion 5 in the lateral direction gradually increases from the skin facing surface 43 of the absorber 4C toward the non-skin facing surface 44. In other words, the length (width) of the main non-integrated portion 5 in the lateral direction gradually decreases from the non-skin facing surface 44 of the absorber 4C toward the skin facing surface 43. Therefore, in the absorber 4C, in the main non-integrated portion 5, the widths of the skin facing surface 43 and the non-skin facing surface 44 are different, and "width at the skin facing surface 43 Wa <width at the non-skin facing surface 44". A magnitude relationship called "Wb" is established.

In the absorber 4C in which the above-mentioned magnitude relationship is established with respect to the length (width) of the main non-integrated portion 5 in the lateral direction, the width of the absorbent core 40 is constant in the thickness direction as shown in FIG. It has a constant width portion 40A and a tapered portion 40B whose width gradually decreases from the skin facing surface 43 toward the non-skin facing surface 44, and the tapered portion 40B is adjacent to the main non-integrating portion 5 in the lateral direction Y. ing.

Generally, the skin facing surface 43 of the absorber 4C is a surface that is more easily observed externally than the non-skin facing surface 44, but if the width Wa of the main non-integrated portion 5 on the skin facing surface 43 is too large, It strongly impresses the observer of the skin-facing surface of the unused diaper that the absorber 4C is divided at the formation position of the main non-accumulation portion 5, thereby allowing the observer to absorb the liquid and the like. , The performance mainly performed by the absorber 4C may be questioned, leading to a decrease in reliability of the diaper. On the other hand, if the width Wa of the main non-integrated portion 5 is made too small for fear of this, the bonding force between the core wrap sheets 41 and 42 in the main non-integrated portion 5 decreases, and as a result, the absorbent core is particularly wet. The shape-retaining property of 40 is lowered, and there is a possibility that the above-mentioned action and effect of the main non-integrated portion 5 may not be sufficiently exerted. On the other hand, in the absorber 4C, as described above, in the main non-integrated portion 5, the magnitude relationship of "width Wa on the skin facing surface 43 <width Wb on the non-skin facing surface 44" is established. Although the presence of the main non-integrated portion 5 is not conspicuous when observing the skin facing surface (surface sheet 2 side) of the diaper 1, both sheets 41 and 42 are firmly joined by the main non-accumulated portion 5. A predetermined effect of the main non-integrated portion 5 is stably produced.

Further, when the magnitude relationship of "width Wa on the skin facing surface 43 <width Wb on the non-skin facing surface 44" is established in the main non-integrating portion 5, the skin-side core wrap sheet 41 in the main non-integrating portion 5 is formed. The thickness of the joint with the non-skin side core wrap sheet 42 tends from the central portion of the main non-integrated portion 5 in the lateral direction Y to the outside in the lateral direction Y in the cross-sectional view along the lateral direction Y as shown in FIG. It will gradually increase as it increases. The joint portion of both sheets 41 and 42 in the main non-integrated portion 5 has such a structure (arch structure) in which the thickness of the central portion in the lateral direction is relatively thin and the thickness of both side portions is relatively thick. If this is done, the resistance to the external force of the joint portion itself is improved, which leads to the improvement of the shape retention of the absorbent core 40.

From the viewpoint of ensuring that the action and effect of the joints of the arch structures of both sheets 41 and 42 are more reliably exerted, the thickness of the joints at the center of the main non-integrated portion 5 in the lateral direction is set to T1. When the thickness of the joint portion at the end portion of the main non-integrated portion 5 in the lateral direction Y is T2, it is preferable that the thickness T1 <thickness T2.

When the absorbent core 40 contains a fiber material such as wood pulp and a water-absorbent polymer (water-absorbent polymer particles) as a core forming material (absorbent material), the fiber material for the water-absorbent polymer in the tapered portion 40B. The content mass ratio (mass of fiber material / mass of water-absorbent polymer) is preferably lower than that in the constant width portion 40A. That is, it is preferable that the tapered portion 40B has a smaller content of the water-absorbing polymer than the constant width portion 40A. If the tapered portion 40B adjacent to the main non-accumulated portion 5 in the lateral direction Y contains a large amount of a water-absorbing polymer having a degree of swelling due to liquid absorption larger than that of the fiber material, the tapered portion after absorption of excrement such as urine. There is a concern that the 40B swells greatly, which causes the width and shape of the main non-accumulation portion 5 to change significantly, and the manifestation of a predetermined effect by the main non-accumulation portion 5 is hindered. However, as described above, water absorption. Regarding the content mass ratio of the fiber material to the sex polymer, the swelling of the tapered portion 40B after absorption of the liquid is suppressed by establishing the magnitude relationship of "tapered portion 40B <constant width portion 40A". Is wiped out.

The absorbent core 40 having the constant width portion 40A and the tapered portion 40B can be manufactured according to a conventionally known method for manufacturing an absorbent core using a fiber stacking device. Specifically, for example, using a fiber stacking device, the fiber material and the water-absorbent polymer particles supplied on an air stream are sucked and deposited on a molding die formed on the outer peripheral surface of the rotating drum to be deposited and absorbed. In the method of obtaining 40, the molding die has a shape in which the portion corresponding to the main non-integrated portion 5 protrudes upward as compared with the peripheral portion, and the width of the portion gradually decreases upward (tapered portion 40B). It can be manufactured by using a molding die having a reverse taper shape in which the width decreases in the opposite direction. Further, since the water-absorbent polymer particles contained in the tapered portion 40B are more likely to fall off than the constant width portion 40A, the above-mentioned "(water absorption in the constant width portion 40A)" is described during the production of the absorbent core 40. Water absorption as usual without any special measures to establish the magnitude relationship of "weight content ratio of fiber material to polymer)> (content mass ratio of fiber material to water absorbent polymer in tapered portion 40B)" If the absorbent core 40 in which the polymer particles are uniformly distributed is manufactured, many water-absorbent polymer particles will fall off from the tapered portion 40B during the period from the manufacturing to the use, so that the absorbent core 40 is used. When the time, that is, when the diaper 1 is worn, the magnitude relationship is established.

The gradation region 4G (see FIG. 4) of the absorber 4 described above is formed by compressing the absorbent core 40 having the tapered portion 40B in the thickness direction of the absorbent core 40. The absorbent core 40 having the gradation region 4G thus formed does not have the tapered portion 40B because the tapered portion 40B is deformed by such compression and the tapered portion collapses.

The configuration of the main non-integrated portion 5 in the absorber 4C described above is also applicable to the auxiliary non-integrated portion 6, and the auxiliary non-integrated portion 6 also has the above-mentioned "width Wa on the skin facing surface 43 <non-skin facing". A magnitude relationship of "width Wb on the surface 44" is established, and the tapered portion 40B may be adjacent to the auxiliary non-integrated portion 6 in a direction orthogonal to the extending direction of the auxiliary non-integrated portion 6.

Although the present invention has been described above, the present invention is not limited to the above-described embodiment and can be appropriately modified. For example, the number of auxiliary non-integrated portions 6 is not particularly limited, and may be one, that is, one auxiliary non-integrated portion 6 is provided only on one of the two outer sides of the main non-integrated portion 5 in the lateral direction Y. It may be in an extended form. Further, in the above-described embodiment, the plurality of auxiliary non-integrated portions 6 are formed line-symmetrically with the main non-integrated portion 5 as the axis of symmetry (see FIGS. 3, 5, and 6), but the plurality of auxiliary non-integrated portions are formed. 6 does not have to be formed line-symmetrically. For example, the auxiliary non-integrated portion 6 extending to one of the two outer sides of the lateral Y of the main non-integrated portion 5 and the auxiliary non-integrating portion extending to the other. The accumulating portions 6 may be arranged alternately in the vertical direction X. All the parts of only one embodiment described above can be mutually used as appropriate.

Further, the disposable diaper of the present invention is not limited to the deployable disposable diaper as in the above embodiment, and can be applied to all diapers used for absorption of body fluid, and is applied to, for example, a pants-type disposable diaper. Can be done. Pants-type disposable diapers typically have a liquid-retaining absorber, a surface sheet placed on the skin-facing side of the absorber, and an exterior placed on the non-skin-facing side of the absorber. A structure including a body, and a pair of side seals, a waist opening, and a pair of leg openings are formed by joining both side edges of the ventral and dorsal parts along the vertical direction of the exterior body. Has. Further, the following additional notes will be disclosed with respect to the above-described embodiment of the present invention.

<1> A liquid-retaining absorber and a surface sheet arranged on the skin-facing surface side of the absorber are provided, and the vertical direction extending from the ventral side of the wearer to the dorsal side via the crotch portion and the lateral direction orthogonal to the vertical direction are provided. The crotch portion which has a direction and is arranged to face the crotch portion at the time of wearing, the ventral portion arranged on the ventral side of the wearer from the crotch portion, and the wearer's back from the crotch portion. A disposable diaper with a dorsal part arranged on the side.
The absorber includes an absorbent core in which a core-forming material containing an absorbent material is integrated, a skin-side core wrap sheet that covers the skin-facing surface of the absorbent core, and a non-skin-facing surface of the absorbent core. It is configured to include a non-skin side core wrap sheet to be covered, and extends vertically from the ventral side to the dorsal side across the vertical center line that bisects the unfolded and stretched diaper in the vertical direction. And
A plurality of non-integrated portions of the core-forming material are formed in the absorbent core, and the plurality of non-integrated portions are a main non-integrated portion extending in the vertical direction at the lateral central portion of the absorbent core. , Including an auxiliary non-accumulation portion extending laterally outward from the main non-accumulation portion.
The skin-side core wrap sheet and the non-skin-side core wrap sheet are joined to each other in the main non-integrated portion.
When the regions I to V are set in the diaper according to the following <method for determining regions I to V>, the main non-integrated portion exists in the regions II and III, and the auxiliary non-accumulated portion exists in the region II. ,
Disposable diapers in which the total area of the auxiliary non-integrated portions present in regions II and III is larger than the total area of the auxiliary non-integrated portions present in regions I and IV.
<Method of determining areas I to V>
In the unfolded and stretched diaper, one virtual straight line extending laterally through the ventral end of the absorber is used as a reference line, and the diaper is located on the dorsal side of the reference line. Draw five virtual straight lines parallel to the reference line at equal intervals. The distance between the virtual straight lines is a value obtained by dividing the vertical length from the vertical center line to the vertical end on the ventral side of the absorber by 5, and further doubling the length. The regions divided into five by these six virtual straight lines are designated as region I, region II, region III, region IV, and region V in order from the one closest to the reference line.

<2> The absorbent core has a wide portion in the region I or II, which is longer in the lateral direction than the portion of the absorbent core located in the region III.
At least one of the auxiliary non-integrated portions existing in the regions I and II has the virtual extension line when the auxiliary non-integrated portion is virtually extended toward a direction away from the main non-integrated portion. The disposable diaper according to <1>, wherein the disposable diaper intersects the reference line and forms an angle of 10 degrees or more and less than 90 degrees in the lateral direction.
<3> The disposable diaper according to <1> or <2>, wherein the auxiliary non-integrated portion penetrates the absorbent core in the thickness direction.
<4> The disposable diaper according to <3>, wherein the skin-side core wrap sheet and the non-skin-side core wrap sheet are joined in the auxiliary non-integrated portion.
<5> A joint portion between the skin-side core wrap sheet and the non-skin-side core wrap sheet, which occupies the area of the non-integrated portion, at least one of the main non-integrated portion and the auxiliary non-integrated portion, preferably all of them. The disposable item according to any one of <1> to <4>, wherein the joint occupancy rate, which is the ratio of the area of the above, is preferably 70% or more, more preferably 80% or more, and more preferably 100%. Diapers.
<6> The lateral lengths of the main non-integrated portion and the auxiliary non-integrated portion are each 5 mm or less, specifically, preferably 1 mm or more, more preferably 2 mm or more, and preferably 5 mm or less, further. The disposable diaper according to any one of <1> to <5>, preferably 4 mm or less.
<7> The disposable diaper according to any one of <1> to <6>, wherein the main non-integrated portion and the auxiliary non-integrated portion do not exist in the region V.
<8> The disposable diaper according to any one of <1> to <7>, wherein a plurality of the auxiliary non-integrated portions extend in different directions from one position in the vertical direction in the main non-accumulated portion. ..
<9> The disposable diaper according to any one of <1> to <8>, wherein the auxiliary non-integrated portion is formed line-symmetrically with the main non-integrated portion as an axis of symmetry.

<10> The disposable diaper according to any one of <1> to <9>, wherein the main non-integrated portion and the auxiliary non-integrated portion each have a rectangular shape in a plan view.
<11> The disposable diaper according to <10>, wherein the longitudinal direction of the main non-integrated portion coincides with the vertical direction, and the longitudinal direction of the auxiliary non-accumulated portion coincides with the lateral direction.
<12> The disposable diaper according to any one of <1> to <11>, wherein the plurality of auxiliary non-integrated portions have the same shape and the same dimensions in a plan view.
<13> The total area (S1) of the auxiliary non-integrated portion existing in the regions II and III is larger than the total area (S2) of the auxiliary non-integrated portion existing in the regions I and IV, and the ratio between the two. However, the former (S1) / latter (S2) is preferably 1.5 or more, more preferably 2.0 or more, and preferably 5.0 or less, still more preferably 4.0 or less. The disposable diaper according to any one of <12>.
<14> The vertical length of the main non-integrated portion is preferably 40% or more, more preferably 50% or more, and preferably 80% or less, further, with respect to the vertical length of the absorbent core. The disposable diaper according to any one of <1> to <13>, preferably 70% or less.
<15> The disposable diaper according to any one of <1> to <14>, wherein the vertical end of the main non-integrated portion does not reach the vertical end of the absorbent core.

<16> The absorber has gradation regions on both sides of the main non-accumulation portion in the lateral direction in which the basis weight of the absorber gradually increases from the main non-accumulation portion toward the outside in the lateral direction. The disposable diaper according to any one of <1> to <15>.
<17> The disposable diaper according to <16>, wherein the lateral length of the gradation region is longer than the lateral length of the main non-integrated portion.
<18> The ratio of the lateral length of the gradation region to the lateral length of the main non-integrated portion is preferably 1.5 or more, more preferably 2.0, as the former / the latter, assuming the former> the latter. The disposable diaper according to the above <16> or <17>, which is preferably 5.0 or less, more preferably 4.0 or less.
<19> The vertical length of the auxiliary non-integrated portion is preferably 1/5 or less, more preferably 1/6 or less with respect to the vertical length of the main non-integrated portion. The disposable diaper according to any one of <18>.
<20> The basis weight of the surface sheet located in the region where the main non-integrated portion and the auxiliary non-integrated portion are present is preferably 30 g / m ² or more, more preferably 35 g / m ² or more, and preferably 35 g / m 2 or more. The disposable diaper according to any one of <1> to <19>, which is 50 g / m ² or less, more preferably 40 g / m ² or less.
<21> The thickness of the surface sheet located in the region where the main non-integrated portion and the auxiliary non-integrated portion are present is preferably 0.7 mm or more, more preferably 1 mm or more, and preferably 5 mm or less, further preferably. Is 3 mm or less, the disposable diaper according to any one of <1> to <20>.
<22> The thickness of the portion other than the main non-integrated portion and the auxiliary non-integrated portion in the absorbent core is preferably 1 mm or more, more preferably 2 mm or more, and preferably 10 mm or less, further preferably 6 mm or less. The disposable diaper according to any one of <1> to <21>.
<23> The basis weight of the portion of the absorbent core other than the main non-integrated portion and the auxiliary non-integrated portion is preferably 250 g / m ² or more, more preferably 350 g / m ² or more, and preferably 600 g / m. The disposable diaper according to any one of <1> to <22>, which is m ² or less, more preferably 500 g / m ² or less.

<24> A plurality of the auxiliary non-integrated portions having different positions in the vertical direction are formed, and among the plurality of auxiliary non-integrated portions, an angle formed by the main non-integrated portion or a virtual extension line thereof and a ventral portion thereof. When the angle increasing from the side to the dorsal side is 90 degrees or the one closest to 90 degrees is defined as the specific auxiliary non-integrated part.
The angle of the auxiliary non-accumulation portion is such that the specific auxiliary non-accumulation portion is present in the region II or III and the auxiliary non-accumulation portion is closer to the vertical end on the ventral side of the absorber than the specific auxiliary non-accumulation portion. Smaller than that of the specific auxiliary non-integration part,
The auxiliary non-integrated portion closer to the vertical end on the dorsal side of the absorber than the specific auxiliary non-integrated portion has the angle larger than that of the specific auxiliary non-integrated portion, <1> to <23. > The disposable diaper according to any one of the items.
<25> The disposable diaper according to <24>, wherein the main non-integrated portion and the auxiliary non-integrated portion do not exist in the region V.
<26> At least one of the main non-integrated portion and the auxiliary non-integrated portion, preferably all of them, gradually increase in lateral length of the non-accumulated portion from the skin-facing surface to the non-skin-facing surface of the absorber. The disposable diaper according to any one of <1> to <25>, which is increasing.
<27> The absorbent core has a constant width portion whose lateral length is constant in the thickness direction of the absorbent core, and the lateral length is not from the skin facing surface of the absorbent core (absorbent). It has a tapered portion that gradually decreases toward the skin facing surface, and the tapered portion is adjacent to the main non-integrated portion or the auxiliary non-integrated portion in the lateral direction.
The absorbent core contains a fiber material and a water-absorbent polymer as the absorbable material, and the content mass ratio of the fiber material to the water-absorbent polymer in the tapered portion, that is, the mass of the fiber material / water absorption. The disposable diaper according to any one of <1> to <26>, wherein the weight of the sex polymer is lower than that in the constant width portion.

1 Disposable diaper F Ventral part M Crotch part R Dorsal side 2 Front side sheet 3 Back side sheet 4, 4A, 4B, 4C Absorber 40 Absorbent core 40A Constant width part 40B Tapered part 40W Wide part 41 Skin side core wrap sheet 42 Non-skin side core wrap sheet 4G Gradation area 5 Main non-integrated part 6 Auxiliary non-integrated part 60 Specific auxiliary non-integrated part 61 Ventral auxiliary non-integrated part 62 Dorsal auxiliary non-integrated part X Vertical direction Y Horizontal direction

Claims (8)

A liquid-retaining absorber and a surface sheet arranged on the skin-facing surface side of the absorber are provided, and a vertical direction extending from the ventral side of the wearer to the dorsal side via the crotch portion and a lateral direction orthogonal to the vertical direction are provided. It has a crotch part that is arranged facing the crotch part at the time of wearing, a ventral part that is arranged on the ventral side of the wearer from the crotch part, and a dorsal side of the wearer than the crotch part. A disposable diaper with a dorsal part that is
The absorber includes an absorbent core in which a core-forming material containing an absorbent material is integrated, a skin-side core wrap sheet that covers the skin-facing surface of the absorbent core, and a non-skin-facing surface of the absorbent core. In the vertical direction from the ventral side to the dorsal side, straddling the vertical center line that bisects the unfolded and stretched diaper, including the non-skin side core wrap sheet to be covered. It is postponed and
A plurality of non-integrated portions of the core-forming material are formed in the absorbent core, and the plurality of non-integrated portions extend in the vertical direction at the center of the absorbent core in the horizontal direction. The integrated portion and the auxiliary non-accumulated portion extending outward from the main non-accumulated portion in the lateral direction are included.
The lateral length of the main non-integrated portion is 5 mm or less, and the lateral length of the auxiliary non-integrated portion is 1 mm or more and 5 mm or less.
The skin-side core wrap sheet and the non-skin-side core wrap sheet are joined to each other in the main non-integrated portion.
When the regions I to V are set in the diaper according to the following <method for determining regions I to V>, the main non-integrated portion exists in the regions II and III, and the auxiliary non-accumulated portion exists in the region II. ,
The total area S1 of the auxiliary non-integrated portion existing in the regions II and III is larger than the total area S2 of the auxiliary non-integrated portion existing in the regions I and IV, and the ratio of the two is S1 / S2. Disposable diapers that are 5 or more and 5.0 or less .
<Method of determining areas I to V>
In the unfolded and stretched diaper, one virtual straight line extending in the lateral direction through the vertical end on the ventral side of the absorber is used as a reference line, and the dorsal side of the reference line is defined as a reference line. Five virtual straight lines parallel to the reference line are drawn at equal intervals. The distance between the virtual straight lines is a value obtained by dividing the length in the vertical direction from the vertical center line to the vertical end on the ventral side of the absorber by 5, and further doubling the length. The regions divided into five by these six virtual straight lines are designated as region I, region II, region III, region IV, and region V in order from the one closest to the reference line. The absorptive core has a wider portion in the absorptive core I or II that is longer in the lateral direction than the portion of the absorptive core located in the region III.
At least one of the auxiliary non-integrated portions existing in the regions I and II has the virtual extension line when the auxiliary non-integrated portion is virtually extended toward a direction away from the main non-integrated portion. The disposable diaper according to claim 1, wherein the disposable diaper intersects the reference line and has an angle of 10 degrees or more and less than 90 degrees with respect to the lateral direction. The disposable diaper according to claim 1 or 2, wherein the auxiliary non-integrating portion penetrates the absorbent core in the thickness direction. The disposable diaper according to claim 3, wherein the skin-side core wrap sheet and the non-skin-side core wrap sheet are joined to each other in the auxiliary non-integrated portion. The disposable diaper according to any one of claims 1 to 4 , wherein the main non-integrated portion and the auxiliary non-accumulated portion do not exist in the region V. The disposable diaper according to any one of claims 1 to 5 , wherein a plurality of auxiliary non-integrated portions extend in different directions from one location in the vertical direction in the main non-accumulated portion. The disposable diaper according to any one of claims 1 to 6 , wherein the auxiliary non-integrated portion is formed line-symmetrically with the main non-integrated portion as an axis of symmetry. A plurality of the auxiliary non-integrated portions having different positions in the vertical direction are formed, and among the plurality of auxiliary non-integrated portions, the angle formed with the main non-integrated portion or a virtual extension line thereof and from the ventral side. When the angle that increases toward the dorsal side is 90 degrees or the one closest to 90 degrees is the specified auxiliary non-integrated part.
The angle of the auxiliary non-accumulation portion is such that the specific auxiliary non-accumulation portion is present in the region II or III and the auxiliary non-accumulation portion is closer to the vertical end on the ventral side of the absorber than the specific auxiliary non-accumulation portion. Smaller than that of the specific auxiliary non-integration part,
Any of claims 1 to 7 , wherein the auxiliary non-accumulation portion closer to the vertical end on the dorsal side side of the absorber than the specific auxiliary non-accumulation portion has an angle larger than that of the specific auxiliary non-accumulation portion. The disposable diaper described in item 1.

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