CN217660461U - Absorbent article - Google Patents

Abstract

The utility model provides an absorptive article which is not easy to leak the excretion liquid such as urine discharged from a wearer. The utility model discloses an absorbent article possesses preceding piece (2), the back piece (3) of non-liquid permeability of liquid permeability, be located absorber (4) between two above pieces and be located preceding piece (2) and intermediate lamella (5) between absorber (4), its characterized in that, absorber (4) contain high absorbent polymer layer (41) and core package piece sheet (42), high absorbent polymer layer (41) contain the high absorbent polymer with the mass ratio more than 60 mass%, core package piece sheet (42) cover high absorbent polymer layer (41), the both ends of the width direction of intermediate lamella (5) compare respectively the both ends of the width direction of high absorbent polymer layer (41) extend by the outside of width direction.

Description

Absorbent article

Technical Field

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

Background

Since absorbent articles such as disposable diapers and incontinence pads are worn for a long time in contact with the crotch of the wearer, it is desired to rapidly absorb the excretory fluid discharged from the wearer and to have excellent fit to the body of the wearer so as not to cause discomfort, and the like to the wearer.

Among such absorbent articles, there is known an absorbent article in which a diffusive intermediate sheet is disposed between a topsheet and an absorbent body in order to improve absorption of excretory fluid.

For example, patent document 1 discloses an absorbent article including a liquid-permeable top sheet, a liquid-impermeable back sheet, an absorbent core disposed between the top sheet and the back sheet, a Super Absorbent Polymer (SAP) as an absorbent material sealed in the core sheet, and a fibrous layer located between the top sheet and the absorbent core, the fibrous layer forming a water channel in the fibrous layer as the absorbent material swells.

The absorbent article of patent document 1 has improved liquid handling properties in the water channel formed in the fibrous layer, and in particular, has the function of distributing the fluid discharged along the length of the water channel.

Documents of the prior art

Patent document

Patent document 1: japanese patent No. 6185163

SUMMERY OF THE UTILITY MODEL

Problems to be solved by the utility model

Since the fiber layers as the intermediate sheet of the absorbent article disclosed in patent document 1 are not disposed at both ends in the width direction of the absorbent core, a part of the excretory fluid such as urine discharged from the wearer easily reaches the portions of the absorbent core not covered with the fiber layers (i.e., both ends in the width direction of the absorbent core). However, since the superabsorbent polymer (SAP) in the absorbent core has a low absorption rate, a part of the discharged liquid reaching the portion of the absorbent core not covered with the fiber layer flows outward in the width direction of the absorbent core without being absorbed by the SAP, and as a result, there is a possibility that the discharged liquid leaks from both end portions in the width direction of the absorbent article.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an absorbent article which is less likely to leak excretory fluid such as urine discharged from a wearer.

Means for solving the problems

The absorbent article according to one aspect of the present invention (claim 1) comprises a liquid-permeable front sheet, a liquid-impermeable back sheet, an absorbent body disposed between the two sheets, and an intermediate sheet disposed between the front sheet and the absorbent body, and is characterized in that the absorbent article has a longitudinal direction, a width direction, and a thickness direction,

the absorbent body comprising a superabsorbent polymer layer and a core wrap sheet covering the superabsorbent polymer layer,

wherein both widthwise end portions of the intermediate sheet extend outward in the widthwise direction than both widthwise end portions of the high-absorbent polymer layer, and the absorbent body has a narrowed (Japanese: buck12428) portion in which both widthwise end portions of the high-absorbent polymer layer are recessed inward in the widthwise direction in a crotch region including the lengthwise center portion,

the extension length of each of the portions of the intermediate sheet, which extend outward in the width direction from both the width-direction end portions of the super absorbent polymer layer, is smaller than the narrowing depth of the narrowing portion.

In the absorbent article according to the present invention, the width-direction both end portions of the intermediate sheet extend outward in the width direction than the width-direction both end portions of the high-absorbent polymer layer, respectively, so that a predetermined space adjacent to the high-absorbent polymer layer can be formed on the non-skin-facing surface side of the extended portion of the intermediate sheet. Thus, even if the excretory fluid such as urine excreted from the wearer reaches the non-skin-facing surface side of the intermediate sheet by spreading in the intermediate sheet or the intermediate sheet, the absorbent article according to the present aspect can gradually absorb the excretory fluid into the Super Absorbent Polymer (SAP) in the super absorbent polymer layer adjacent to the space while temporarily storing the excretory fluid in the space, and therefore, the excretory fluid can be made less likely to leak from both ends in the width direction of the absorbent article.

In addition, according to another aspect (aspect 2) of the present invention, in the absorbent article according to aspect 1, the intermediate sheet is formed of a water-absorbent sheet.

The intermediate sheet of the absorbent article according to the present invention is formed of the water-absorbent sheet, and the intermediate sheet itself can absorb the excretory fluid, so that leakage of the excretory fluid can be less likely to occur as a result.

The absorbent sheet forming the intermediate sheet of the absorbent article according to the present invention contains pulverized pulp in a mass ratio of 10 mass% or more, and therefore the intermediate sheet is a bulky and flexible sheet, and the wearer can be less likely to feel the feel of a knot of superabsorbent polymer in the superabsorbent polymer layer, which is hard in the core wrap sheet of the absorbent body located on the non-skin-facing surface side of the intermediate sheet. In addition, in the absorbent article according to the present invention, when a body pressure is applied from the wearer when the absorbent article is worn, the bulky and flexible intermediate sheet is folded so as to cover the end portions in the width direction of the absorbent body, and therefore, leakage of the excretory fluid from both end portions in the width direction of the absorbent article can be made less likely to occur.

In the absorbent article according to the present invention, the intermediate sheet is formed of a water-absorbent sheet containing a super-absorbent polymer, and therefore, the intermediate sheet has higher absorbency and is less likely to cause leakage of excretory fluid.

In the absorbent article according to the present invention, the extension length of the intermediate sheet is smaller than the narrowing depth of the narrowing portion of the absorbent body, so that the space formed on the non-skin-facing surface side of the extension portion of the intermediate sheet can be formed into a space of an appropriate capacity, and even when an external force is applied in the width direction of the absorbent article, the intermediate sheet and the absorbent body are less likely to deform in the crotch region, and a gap can be less likely to be formed between the intermediate sheet and the body surface of the wearer. Thus, the absorbent article according to the present aspect can more accurately prevent leakage of excretory fluid from, in particular, both ends in the width direction of the crotch region.

In another aspect (aspect 3) of the present invention, in the absorbent article according to aspect 1, the intermediate sheet has a narrowed portion formed by recessing both width-direction end portions toward the inside in the width direction in a crotch region including the longitudinal-direction central portion.

The intermediate sheet of the absorbent article according to the present invention has the narrowed portion in the crotch region, and therefore, even when an external force is applied in the width direction of the absorbent article due to the absorbent article being sandwiched between the legs of the wearer or the like, the intermediate sheet is not easily deformed in the crotch region, and a gap can be hardly formed between the intermediate sheet and the body surface of the wearer. Thus, the absorbent article according to the present aspect can further reduce leakage of the excretory fluid from, in particular, both ends in the width direction of the crotch region.

In another aspect (aspect 4) of the present invention, in the absorbent article according to aspect 3, a central portion in the longitudinal direction of the narrowed portion of the intermediate sheet is located on a front side in the longitudinal direction with respect to the central portion in the longitudinal direction of the absorbent article.

In the absorbent article according to the present invention, the position of the constricted portion of the intermediate sheet is shifted toward the front side of the absorbent article, and a certain absorption performance can be ensured on the rear side of the absorbent article, so that even in a case where the wearer is in a supine position and the excretory fluid flows toward the rear side of the absorbent article, the excretory fluid can be more reliably absorbed, and as a result, leakage of the excretory fluid can be less likely to occur.

In another aspect (aspect 5) of the present invention, in the absorbent article according to aspect 1, the absorber has a narrowed portion in which both width-direction end portions of the high-absorbent polymer layer are respectively recessed toward the inside in the width direction in a crotch region including a central portion in the length direction.

Since the absorbent body of the absorbent article according to the present invention has the narrowed portion in the crotch region, even when an external force is applied in the width direction of the absorbent article due to the absorbent article being sandwiched between the legs of the wearer or the like, the absorbent body (specifically, the super absorbent polymer layer in the absorbent body) is not easily deformed in the crotch region, and therefore, a gap can be hardly formed between the absorbent body and the body surface of the wearer. Thus, the absorbent article according to the present aspect can further reduce leakage of the excretory fluid from, in particular, both ends in the width direction of the crotch region.

In another aspect (aspect 6) of the present invention, in the absorbent article according to aspect 5, the absorbent body is provided with a super absorbent polymer at the constriction portion so that a weight per unit area of the super absorbent polymer decreases outward in the width direction.

In the absorbent article according to the present invention, since the superabsorbent polymer is disposed in the narrowing portion such that the weight per unit area of the superabsorbent polymer decreases toward the outside in the width direction, even when the superabsorbent polymer layer in the absorbent body absorbs excretory fluid and swells, the change in thickness due to swelling is reduced in the crotch region, and a gap is less likely to be formed between the superabsorbent polymer layer and the body surface of the wearer. Thus, the absorbent article according to the present aspect can further reduce leakage of the excretory fluid from, in particular, both ends in the width direction of the crotch region.

In addition, the absorbent article according to the present invention has an advantage that the wearer is less likely to feel the feeling of the highly absorbent polymer pimple in the crotch region in contact with the inner portions of the legs of the wearer.

In another aspect (aspect 7) of the present invention, in the absorbent article according to aspect 5, the absorbent body is provided with a super absorbent polymer at the constriction portion so that a weight per unit area of the super absorbent polymer increases toward an outer side in the width direction.

In the absorbent article according to the present invention, since the superabsorbent polymer is disposed in the narrowing portion such that the weight per unit area of the superabsorbent polymer increases toward the outer side in the width direction, even when the superabsorbent polymer layer in the absorbent body absorbs the excretory fluid and swells, the superabsorbent polymer layer in the lower crotch region can be brought closer to the body surface of the wearer, and even the excretory fluid which has a low tendency to flow can be absorbed reliably. Thus, the absorbent article according to the present aspect can further reduce leakage of the excretory fluid from, in particular, both ends in the width direction of the crotch region.

In another aspect of the present invention (claim 8), in the absorbent article according to claim 1, the absorbent article further includes a pair of side sheets extending in the longitudinal direction at both width-direction end portions thereof and disposed on the skin-facing surface side of the top sheet,

the pair of side sheets respectively have a non-fixing portion which is located at an end portion on an inner side in the width direction and is not joined to the front sheet, and a fixing portion which is adjacent to an outer side in the width direction of the non-fixing portion and is joined to the front sheet,

the intermediate sheet has both width-direction end portions located between the width-direction inner end portions of the pair of side sheets and the fixing portion, respectively, in a plan view.

In the absorbent article according to the present invention, the intermediate sheet has both widthwise end portions which are located between the widthwise inner end portions of the pair of side sheets and the fixing portions, respectively, in plan view, and therefore, a gap which cannot absorb the excretory fluid is not easily formed between the widthwise inner end portions of the side sheets and the absorbent body, or the excretory fluid is not easily leaked along the intermediate sheet to the widthwise outer side, and as a result, the excretory fluid is less likely to leak.

In another aspect (aspect 9) of the present invention, in the absorbent article according to aspect 1, the absorbent body has a multilayer structure in which a plurality of the superabsorbent polymer layers are stacked in the thickness direction with interlayer sheet members interposed therebetween.

The absorbent body of the absorbent article according to the present invention has a multilayer structure in which a plurality of super absorbent polymer layers are laminated, and therefore, can exhibit a higher absorption performance corresponding to the number of layers, and as a result, leakage of excretory fluid can be made less likely to occur.

In another aspect (aspect 10) of the present invention, in the absorbent article according to aspect 1, the absorbent article includes a compressed groove in a region where the middle sheet and the super absorbent polymer layer of the absorber overlap in the thickness direction, and the compressed groove is formed by compressing the absorbent article in the thickness direction.

The absorbent article according to the present invention has the compressed groove in the region where the intermediate sheet and the super absorbent polymer layer overlap, and therefore, the compressed groove is likely to diffuse the excretory fluid by capillary action, and the absorbent article is excellent in the absorption of the repeatedly supplied excretory fluid, and as a result, the leakage of the excretory fluid can be made less likely to occur.

Effect of utility model

The utility model provides an absorptive article which can prevent leakage of excretory fluid such as urine discharged from a wearer.

Drawings

Fig. 1 is a plan view of a disposable diaper 1 according to an embodiment of the absorbent article of the present invention, as viewed from a front sheet 2 side in a thickness direction T, in a developed state.

FIG. 2 is an imaginary line C along the longitudinal center of the disposable diaper 1 shown in FIG. 1 _W Is enlarged in cross section.

Fig. 3 is a plan view schematically showing the arrangement of the super absorbent polymer layer 41 and the intermediate sheet 5 in the disposable diaper 1 shown in fig. 1.

Detailed Description

Various definitions

Hereinafter, preferred embodiments of the absorbent article of the present invention will be described in detail with reference to the drawings. In the present specification, unless otherwise specified, "a case where an object (for example, a disposable diaper) is placed on a horizontal plane in an unfolded state as viewed from above in a vertical direction along a thickness direction of the object" is simply referred to as "plan view".

Unless otherwise stated, various directions and the like used in the present specification are as follows.

In the present specification, "the longitudinal direction" means a direction in which the length of a vertically long object (for example, a disposable diaper in an unfolded state) is long in a plan view, "the width direction" means a direction in which the length of a vertically long object is short in a plan view, "and" the thickness direction "means a direction perpendicular to an object placed on a horizontal plane in an unfolded state," and the above longitudinal direction, the width direction, and the thickness direction are in a relationship orthogonal to each other.

In the present specification, the "one side in the longitudinal direction of the absorbent article which is the side in the longitudinal direction that becomes relatively close to the abdomen of the wearer when the wearer wears the absorbent article" is referred to as the "front side of the absorbent article", and the "other side in the longitudinal direction of the absorbent article which is the side in the longitudinal direction that becomes relatively far from the abdomen of the wearer (i.e., the side relatively close to the back of the wearer) when the wearer wears the absorbent article" is referred to as the "rear side of the absorbent article".

In the present specification, an imaginary line extending in the longitudinal direction and positioned at the center in the width direction of the vertically long object is referred to as a "width direction center imaginary line", and an imaginary line extending in the width direction and positioned at the center in the longitudinal direction of the vertically long object is referred to as a "longitudinal direction center imaginary line". In this connection, "the side of the vertically long object in the longitudinal direction relatively close to the longitudinal center imaginary line" is referred to as "inner side in the longitudinal direction", and "the side of the vertically long object in the longitudinal direction relatively distant from the longitudinal center imaginary line" is referred to as "outer side in the longitudinal direction". Similarly, the side of the vertically long object that is relatively close to the virtual line of the center in the width direction is referred to as the "inner side in the width direction", and the side of the vertically long object that is relatively far from the virtual line of the center in the width direction is referred to as the "outer side in the width direction".

In the present specification, in the thickness direction of the absorbent article, "the side relatively close to the skin surface of the wearer when the absorbent article is worn" is referred to as "the skin-facing surface side", and "the side relatively far from the skin surface of the wearer when the absorbent article is worn" is referred to as "the non-skin-facing surface side".

Disposable diaper having a disposable diaper core

Fig. 1 is a plan view of a disposable diaper 1 according to an embodiment of the absorbent article of the present invention, as viewed from a front sheet 2 side in a thickness direction T, in a developed state. Further, fig. 2 is a virtual line C along the center in the longitudinal direction of the disposable diaper 1 shown in fig. 1 _W Is enlarged in cross section. Fig. 3 is a plan view schematically showing the arrangement of the super absorbent polymer layer 41 and the intermediate sheet 5 in the disposable diaper 1 shown in fig. 1.

The disposable diaper 1 has a longitudinal direction L and a width direction W in a plan view, and has a substantially central portion in the longitudinal direction L facing an inner side W in the width direction W as shown in fig. 1 _i A vertically long external shape which is formed by thin and narrow and roughly hourglass. The disposable diaper 1 is a so-called tape-type disposable diaper, and is configured to be a rear side L in a longitudinal direction L of a back side of a wearer when worn _B Has outer sides W facing the width direction W _o The pair of extended belt members become the rear side L of the length direction L of the back side of the wearer when the pair of extended belt members are worn _B And a front side L in the longitudinal direction L which becomes the abdominal side of the wearer when worn _F End ofThe sections may be joined by the pair of strap members.

The outer shape of the disposable diaper 1 is not limited to the above-described shape, and any shape can be adopted as long as it is vertically long, and it can be adapted to various uses, use forms, and the like.

Further, as shown in fig. 2, the disposable diaper 1 has, as a basic structure, a skin-facing surface side T forming the disposable diaper 1 in a thickness direction T ₁ The front liquid-permeable sheet 2 on the surface, and the non-skin-facing surface side T forming the disposable diaper 1 ₂ A liquid-impermeable back sheet 3 on the front surface, an absorbent body 4 positioned between the above two sheets, and an intermediate sheet 5 positioned between the front sheet 2 and the absorbent body 4.

The disposable diaper 1 further includes, similarly to a normal tape-type disposable diaper, both end portions in the width direction (i.e., one end portion 1E in the width direction W of the disposable diaper 1 in fig. 1) ₁ And the other end portion 1E ₂ ) Each end portion of (2) extends in the longitudinal direction L and is disposed on the skin-facing surface side T of the topsheet 2 ₁ A pair of side pieces 6, and a pair of side pieces 6 located inward W in the width direction W of the side pieces 6 _i A plurality of stretchable members (e.g., rubber threads) arranged along the longitudinal direction L at the end portions 61 of the disposable diaper 1, a plurality of stretchable members for stretching the both end portions in the width direction of the disposable diaper 1 in the longitudinal direction L, respectively, and a rear side L in the longitudinal direction L of the disposable diaper 1 _B Are respectively directed to the outer sides W in the width direction W _o A pair of extended belt members and a skin-facing surface side T arranged on the back sheet 3 ₁ The leak-proof membrane of (1).

The pair of side panels 6 are disposed on the inner side W in the width direction W of the pair of side panels 6 when the disposable diaper 1 is put on (i.e., when the disposable diaper 1 is bent in the longitudinal direction L) _i The pair of side pieces 6 can be contracted in the longitudinal direction L by the stretchable member of the end portion 61 of (2), and the inner side W in the width direction W of the pair of side pieces 6 can be made _i The end portions 61 of the pair of the leakage preventing wall portions are erected.

In the disposable diaper 1, as shown in fig. 1 to 3, the absorbent member 4 includesA super absorbent polymer layer 41 and a core wrap sheet 42, wherein the super absorbent polymer layer 41 contains a super absorbent polymer at a mass ratio of 60 mass% or more, the core wrap sheet 42 covers the super absorbent polymer layer 41, and the intermediate sheet 5 is formed at both ends in the width direction of the intermediate sheet 5 (that is, at one end 5E in the width direction W of the intermediate sheet 5 in fig. 1 to 3) ₁ And the other end 5E ₂ ) Each of which is larger than both ends in the width direction of the super absorbent polymer layer 41 (i.e., one end 41E in the width direction W of the super absorbent polymer layer 41 in fig. 1 to 3) ₁ And the other end portion 41E ₂ ) On the outer side W in the width direction W _o And is extended.

Thus, each of the widthwise opposite ends of the intermediate sheet 5 of the disposable diaper 1 is located further outward in the width direction W than the widthwise opposite ends of the absorbent polymer layer 41 _o Is extended so as to be able to be in the extended portion 5E of the intermediate sheet 5 as shown in fig. 2 _X Non-skin-facing side T of ₂ Forming a predetermined space S adjacent to the super absorbent polymer layer 41 _P . Thus, even if the excretory fluid such as urine excreted from the wearer spreads on or in the intermediate sheet 5 and reaches the non-skin-facing surface side T ₂ The disposable diaper 1 can temporarily store the excretory fluid in the space S _P One side of the space S _P The superabsorbent polymer (SAP) in the adjacent superabsorbent polymer layer 41 gradually absorbs the excretory fluid, and therefore can be made less likely to occur from both widthwise ends of the disposable diaper 1 (i.e., one widthwise end 1E of the disposable diaper 1 in fig. 1) ₁ And the other end portion 1E ₂ ) The excretory fluid of (2) leaks.

As shown in fig. 1, the disposable diaper 1 is divided into 3 regions in the longitudinal direction L. That is, the disposable diaper 1 is divided into a front side L in the longitudinal direction L _F Front side region A of _F And a rear side L located in the longitudinal direction L _B Rear side area A of _B And a crotch region A located between the above regions and including a central portion in the longitudinal direction L _C 。

In the present invention, the allocation of the above regions divided in the longitudinal direction of the absorbent article is appropriately set for each type of absorbent article, depending on the type of absorbent article, specifically, the type of excrement such as urine, feces, and menstrual blood discharged from the wearer, the age and sex of the wearer, the position and region of the absorbent body facing or abutting the excretory opening of the wearer, and the structure of the absorbent body. Therefore, for example, the absorbent article may be divided into the front region, the rear region, and the crotch region by simply equally dividing the absorbent article in the longitudinal direction 3, or the crotch region or the rear region may be divided so as to be longer than the other regions in the longitudinal direction.

Hereinafter, various components of the absorbent article of the present invention will be described in further detail with reference to the disposable diaper 1 of the above-described embodiment.

Dough sheet

In the above-described disposable diaper 1, the topsheet 2 has a first end portion 1E extending from one end portion to the other end portion in the longitudinal direction L of the disposable diaper 1 and from the width direction W of the disposable diaper 1 in a plan view as shown in fig. 1 ₁ Near to the other end 1E ₂ A vertically long profile shape extending proximally. As shown in fig. 2, the topsheet 2 is disposed on the skin-facing surface side T in the thickness direction T of the disposable diaper 1 ₁ The position of (2) is determined by the skin-facing surface side T of the disposable diaper 1 which forms a contact surface capable of contacting the skin of the wearer ₁ The surface of (2) is formed of a liquid-permeable sheet-like member.

Further, as shown in fig. 1, the front sheet 2 is positioned on the non-skin-facing surface side T ₂ The topsheet 2 of the super absorbent polymer layer 41 of the absorbent body 4 at the position(s) has a slightly larger dimension in the longitudinal direction L and the width direction W, and is positioned on the non-skin-facing surface side T at least in part of the peripheral edge part ₂ Is joined to the back sheet 3.

In the present invention, the outer shape, various dimensions, unit area weight, and the like of the top sheet are not particularly limited as long as they can be used as a top sheet of an absorbent article, and any outer shape, various dimensions, unit area weight, and the like can be adopted according to desired liquid permeability, skin touch, flexibility, strength, and the like.

Back sheet

In the above-described disposable diaper 1, the back sheet 3 extends from one end portion to the other end portion in the longitudinal direction L of the disposable diaper 1 in a plan view, and is provided from one end portion 1E in the width direction W of the disposable diaper 1 ₁ To the other end 1E ₂ The shape of the vertically elongated profile of the ground extension. The back sheet 3 is disposed on the non-skin-facing surface side T in the thickness direction T of the disposable diaper 1 as shown in fig. 2 ₂ From the non-skin-facing surface side T forming the disposable diaper 1 ₂ And a liquid-impermeable sheet member for preventing leakage of excretory fluid such as urine from passing through the absorbent body 4 to the outside of the disposable diaper 1.

In the present invention, the shape, dimensions, basis weight, and the like of the back sheet are not particularly limited as long as the back sheet can be used as a back sheet of an absorbent article, and any shape, dimensions, basis weight, and the like can be adopted according to desired leakage-proof performance, air permeability, strength, and the like.

Intermediate sheet

In the disposable diaper 1 described above, the intermediate sheet 5 is positioned between the topsheet 2 and the absorbent member 4, and as shown in fig. 1 to 3, the intermediate sheet 5 has a non-skin-facing surface side T with respect to the intermediate sheet 5 ₂ The super absorbent polymer layer 41 of the disposed absorbent body 4 has a vertically long outline shape with slightly larger dimensions in the longitudinal direction L and the width direction W. As shown in fig. 2, the intermediate sheet 5 is disposed at a position between the topsheet 2 and the absorbent member 4 in the thickness direction T of the disposable diaper 1, and is capable of diffusing, in the planar direction, the excretion liquid such as urine that has passed through the topsheet 2 toward the non-skin-facing surface side T ₂ The super absorbent polymer layer 41 of the absorbent body 4 of (2) is formed of a water-absorbent sheet such as a water-absorbent nonwoven fabric to which the excretion liquid is transferred.

As described above, the intermediate sheet 5 has both width-direction end portions of the intermediate sheet 5 (i.e., one width-direction W end portion 5 of the intermediate sheet 5 in fig. 1 to 3)E ₁ And the other end 5E ₂ ) Is located on the non-skin-facing surface side T ₂ The both ends in the width direction of the super absorbent polymer layer 41 of the absorbent body 4 (i.e., one side end 41E in the width direction W of the super absorbent polymer layer 41 in fig. 1 to 3) ₁ And the other end portion 41E ₂ ) On the outer side W in the width direction W _o And is extended.

Thus, the disposable diaper 1 can be set in the extension portion 5E of the intermediate sheet 5 as shown in FIG. 2 _X Non-skin-facing side T of ₂ Forming a predetermined space S adjacent to the super absorbent polymer layer 41 _P Therefore, even if the excretory fluid such as urine excreted from the wearer spreads on or in the intermediate sheet 5 and reaches the non-skin-facing surface side T ₂ It is also possible to temporarily store the waste liquid in the space S _P One side of the space S _P The Super Absorbent Polymer (SAP) in the adjacent super absorbent polymer layers 41 gradually absorbs the excretory fluid, and as a result, the excretory fluid is less likely to leak from both widthwise ends of the disposable diaper 1.

The intermediate sheet 5 may be positioned on the non-skin-facing surface side T ₂ The super absorbent polymer layer 41 of the absorbent body 4 in (a) is not particularly limited as long as it can transfer the excretion liquid such as urine coming through the top sheet 2, and any sheet-like member such as a liquid-permeable sheet-like member or a hydrophilic napkin similar to the top sheet 2 can be used in addition to the above-mentioned water-absorbent sheet (e.g., water-absorbent nonwoven fabric).

However, the intermediate sheet 5 is preferably formed of the water-absorbent sheet as described above. When the intermediate sheet 5 is formed of a water-absorbent sheet, the intermediate sheet 5 can also absorb the excretory fluid, and as a result, leakage of the excretory fluid can be made less likely to occur.

The water-absorbent sheet forming the intermediate sheet 5 preferably contains pulverized pulp in a mass ratio of 10 mass% or more. When the water-absorbent sheet forming the intermediate sheet 5 contains the ground pulp in a mass ratio of 10 mass% or more, the intermediate sheet 5 becomes a bulky and flexible sheet, and therefore the wearer can be less likely to feel that the water-absorbent sheet is positioned on the non-skin-facing surface side T of the intermediate sheet 5 ₂ Core of absorbent body 4The feel of the pimples of superabsorbent polymer of the stiff, superabsorbent polymer layer 41 of the wrapper sheet 42. Further, when a body pressure is applied from the wearer when the disposable diaper 1 including such an intermediate sheet 5 is put on, the bulky and flexible intermediate sheet 5 is bent so as to cover the end portions in the width direction W of the absorbent body 4, and therefore leakage of excreta liquid from both end portions in the width direction of the disposable diaper 1 can be made less likely to occur.

In addition, the water-absorbent sheet forming the intermediate sheet 5 preferably contains a super absorbent polymer. When the water-absorbent sheet forming the intermediate sheet 5 contains a super absorbent polymer, leakage of excretory fluid can be further made less likely to occur because the intermediate sheet has higher absorbency.

Here, when the water-absorbent sheet contains a super-absorbent polymer, the content thereof is not particularly limited, and any content corresponding to desired absorbency or the like can be used. The water-absorbent sheet preferably contains the super-absorbent polymer in a mass ratio of 10 mass% or more, and more preferably contains the super-absorbent polymer in a mass ratio of 30 to 70 mass%. When the water-absorbent sheet forming the intermediate sheet contains a super-absorbent polymer at a mass ratio of 10 mass% or more, the intermediate sheet has further high absorbency and therefore leakage of excretory fluid can be further suppressed, and when the super-absorbent polymer is contained at a mass ratio of 30 mass% to 70 mass%, the intermediate sheet has moderate softness without becoming hard and has further high absorbency and therefore leakage of excretory fluid can be further suppressed without impairing the wearing feeling of the disposable diaper.

The Super Absorbent Polymer is a powder or a pellet made of a high Absorbent Polymer such as a sodium acrylate copolymer (sodium acrylate copolymer) and is known in the art, and is called SAP (Super Absorbent Polymer).

In the above-described disposable diaper 1, the absorber 4 is located in the crotch region a including the central portion in the longitudinal direction L _C The both ends in the width direction of the super absorbent polymer layer 41 are respectively directed to the inner side W in the width direction _i By recessing of the collarThe narrow part 41C, and each of the two widthwise end parts of the middle sheet 5 are located further outward in the widthwise direction W than the two widthwise end parts of the absorbent polymer layer 41 _o The portion extending the ground (i.e., the extension portion 5E of the intermediate sheet 5) _X ) The respective extension lengths are preferably smaller than the narrowing depth of the narrowing portion 41C of the absorbent body 4. Thus, when the extension length of the intermediate sheet 5 is smaller than the narrowing depth of the narrowing portion 41C of the absorbent body 4, the extension portion 5E formed in the intermediate sheet 5 can be formed _X Non-skin-facing side T of ₂ Space S of _P The intermediate sheet 5 and the absorbent body 4 form a space of an appropriate capacity, and even when an external force is applied in the width direction W of the disposable diaper 1, the intermediate sheet 5 and the absorbent body 4 are in the crotch region A _C And is less deformable, enabling a gap to be less likely to form with the body surface of the wearer. With this, the disposable diaper 1 having such a structure can more reliably prevent the generation of the self-standing diaper particularly in the crotch region a _C The drainage liquid at both ends in the width direction of (2) is leaked.

In the present specification, the narrowing depth of the narrowing portion refers to the width-directional length of the bottom portion of the narrowing portion and a virtual straight line connecting both longitudinal-directional ends (i.e., both longitudinal-directional ends of the narrowing portion) of a portion in which one end or the other end in the width direction of at least 1 layer of the super absorbent polymer layer forming the narrowing portion is recessed inward in the width direction.

In the present specification, both longitudinal end portions of the narrowing portion include: both longitudinal ends of a portion in which one end in the width direction of at least 1 superabsorbent polymer layer forming the constriction is recessed toward the inside in the width direction; and both longitudinal ends of a portion in which the other end in the width direction of at least 1 superabsorbent polymer layer forming the constriction is recessed inward in the width direction. The two longitudinal ends are portions corresponding to four corners of the narrowing portion.

In the disposable diaper 1, as shown in fig. 1 and 3, the intermediate sheet 5 is located in the crotch region a _C Having both ends in the width direction oriented at one timeInner side W in the width direction W of diaper 1 _i A narrowed portion 5C formed by sinking. When the intermediate sheet 5 is in the crotch region A _C With such a narrowed portion 5C, even when an external force is applied in the width direction W of the disposable diaper 1 due to the disposable diaper 1 being sandwiched between the legs of the wearer or the like, the intermediate sheet 5 is in the crotch region a _C And is less likely to deform, and can be less likely to form a gap with the body surface of the wearer. Thus, the disposable diaper 1 can be made less likely to generate self-life, particularly in the crotch region a _C The drainage liquid at both ends in the width direction of (2) is leaked.

In the above-described disposable diaper 1, as shown in fig. 1, the intermediate sheet 5 has a narrowed portion 5C of the intermediate sheet 5 at the center portion in the longitudinal direction L (see a virtual line C 'including the longitudinal center of the intermediate sheet 5 in fig. 3)' _W Portion(s) is located at a position farther than the center in the longitudinal direction L in the disposable diaper 1 (i.e., an imaginary line C including the longitudinal center of the disposable diaper 1 in fig. 1) _W Portion) toward the front side L in the longitudinal direction L _F The position of (a). When the position of the narrowed part 5C of the intermediate sheet 5 is thus shifted to the front side L of the disposable diaper 1 _F At this time, since it can be at the rear side L of the disposable diaper 1 _B Since a certain absorption performance is ensured, even when the wearer is in a supine position, the excretory fluid is directed to the rear side L of the disposable diaper 1 _B Even in such a case, the excretion liquid can be absorbed more securely, and as a result, leakage of the excretion liquid can be made less likely to occur.

In addition, in the present invention, it is not essential that the intermediate sheet has the narrowed portion, and therefore the absorbent article of the present invention may not have the narrowed portion of the intermediate sheet as described above.

In the present invention, the outer shape, various dimensions, basis weight, and the like of the intermediate sheet are not particularly limited as long as the intermediate sheet can be used as an absorbent article, and any outer shape, various dimensions, basis weight, and the like can be adopted according to desired water absorption, liquid diffusibility, strength, and the like.

Absorbent body

In the above disposable diaperIn the diaper 1, as shown in fig. 1, the absorbent member 4 extends over a wide range in the longitudinal direction L of the disposable diaper 1 in a plan view, and has a substantially central portion in the longitudinal direction L directed inward in the width direction W _i The vertical long external shape of the roughly hourglass shape is obtained after the thin narrowing. As shown in fig. 2, the absorbent body 4 is disposed between the intermediate sheet 5 and the back sheet 3 in the thickness direction T of the disposable diaper 1, and is formed of an absorbent member having a predetermined water absorbing property capable of absorbing and retaining excretory fluid such as urine that has passed through the front sheet 2 and the intermediate sheet 5.

As shown in fig. 2, the absorbent body 4 mainly includes a superabsorbent polymer layer 41 containing a superabsorbent polymer at a mass ratio of 60 mass% or more and a core sheet 42 covering the superabsorbent polymer layer 41, and more specifically, the absorbent body 4 has a multilayer structure in which two superabsorbent polymer layers 41 are laminated in a thickness direction T with an interlayer sheet member 43 interposed therebetween, and has a structure in which the two superabsorbent polymer layers 41 are disposed on the skin-facing surface side T ₁ And a non-skin-facing side T ₂ The core wrap sheet 42.

The super absorbent polymer layer 41 may contain another water absorbent material as long as it contains a high absorbent polymer (SAP) such as a sodium acrylate copolymer at a mass ratio of 60 mass% or more. Examples of such absorbent materials include water-absorbent fibers such as pulp fibers (e.g., ground pulp), cellulose fibers such as cotton, rayon, and acetate fibers.

The core wrap sheet 42 is not particularly limited as long as it can be used as a core wrap sheet of an absorbent article, and any hydrophilic sheet member (for example, a tissue made of hydrophilic cellulose fibers) corresponding to desired water absorbency, strength, and the like can be used.

In addition, as the above-described interlayer sheet member 43, a hydrophilic sheet member similar to the core sheet 42 can be used.

The form in which the super absorbent polymer layer 41 is covered with the core wrap sheet 42 is also not particularly limited, and examples thereof includeThe super absorbent polymer layer 41 may be disposed on the skin-facing surface side T as in the disposable diaper 1 described above ₁ And a non-skin-facing side T ₂ The core wrap sheet 42 of (4) may be covered with a sheet arranged on the skin-facing surface side T ₁ And a non-skin-facing side T ₂ With the larger 1-core tablet-coated sheet 42 on either side.

In the disposable diaper 1, as shown in fig. 1 and 3, the absorbent member 4 is located in the crotch region a _C Has a structure in which both ends in the width direction of the super absorbent polymer layer 41 are respectively directed to the inner sides W in the width direction _i The recessed narrowed portion 41C facilitates the disposable diaper 1 to be in close contact with the crotch of the wearer. When the absorbent body 4 is in the crotch region A _C With the constriction 41C in this way, even when an external force is applied in the width direction W of the disposable diaper 1 by the disposable diaper 1 being sandwiched between the legs of the wearer or the like, the absorbent body 4 (specifically, the super absorbent polymer layer 41 in the absorbent body 4) is in the crotch region a _C And is not easily deformed, and thus can be less likely to form a gap with the body surface of the wearer. With this, the disposable diaper 1 having such a structure can be made less likely to generate self-emission particularly in the crotch region a _C The drainage liquid at both ends in the width direction of (2) is leaked.

Further, when the absorbent body 4 has such a constricted portion 41C, the absorbent body 4 having relatively high rigidity among the constituent members of the disposable diaper 1 (specifically, the superabsorbent polymer layer 41 in the absorbent body 4) is less likely to come into contact with the inner portions of the wearer's legs, and therefore there is also an advantage that the wearer can be less likely to feel a foreign body sensation.

Here, in the present specification, the narrowing portion of the absorber is a part of the absorber in which both widthwise ends of at least 1 superabsorbent polymer layer are depressed toward the inside in the widthwise direction in a crotch region including a central portion in the lengthwise direction of the absorbent article, and the both widthwise ends of the absorber can be defined as a part in which the widthwise length sandwiched in the lengthwise direction is narrower by portions in which both widthwise ends of the at least 1 superabsorbent polymer layer are depressed toward the inside in the widthwise direction (that is, both lengthwise ends of the narrowing portion).

In the disposable diaper 1 described above, the absorbent body 4 is preferably formed in the constricted portion 41C such that the basis weight of the super absorbent polymer is gradually increased toward the outer side W in the width direction W _o So as to decrease or so that the basis weight of the super absorbent polymer decreases toward the outer side W in the width direction W _o The superabsorbent polymer is disposed in an enlarged manner.

The narrowing portion 41C of the absorbent body 4 is formed such that the basis weight of the super absorbent polymer is gradually increased toward the outer side W in the width direction W _o When the superabsorbent polymer is disposed in such a manner as to decrease, the superabsorbent polymer layer 41 in the absorbent body 4 can swell by absorbing excretory fluid, and can be placed in the crotch region A _C Since the change in thickness due to swelling is reduced and a gap is less likely to be formed between the disposable diaper 1 having such a structure and the body surface of the wearer, the disposable diaper can be more less likely to develop itself, particularly in the crotch region a _C The excretory fluid at both ends in the width direction of (1) leaks. The disposable diaper 1 having such a configuration also has a crotch region a in contact with inner portions of both legs of the wearer _C It is not easy for the wearer to feel the advantage of the pimple feel of the super absorbent polymer.

In addition, the narrowing portion 41C of the absorbent body 4 is formed such that the weight per unit area of the super absorbent polymer is increased toward the outer side W in the width direction W _o When the superabsorbent polymer is arranged so as to be enlarged, the crotch region a can be made to swell when the superabsorbent polymer layer 41 in the absorbent body 4 absorbs excretory fluid _C The super absorbent polymer layer 41 is close to the surface of the wearer's body, and thus even the excreted liquid with weak momentum that flows can be securely absorbed. With this, the disposable diaper 1 having such a structure can be made less likely to generate self-emission particularly in the crotch region a _C The excretory fluid at both ends in the width direction of (1) leaks.

In addition, in the present invention, it is not essential that the absorbent body has the constriction, and therefore the absorbent article of the present invention may not have the constriction of the absorbent body as described above.

In the above-described disposable diaper 1, the absorbent body 4 has a multilayer structure in which two superabsorbent polymer layers 41 are laminated in the thickness direction T with an interlayer sheet member 43 interposed therebetween as shown in fig. 2, but the structure of the absorbent body is not limited to this embodiment in the present invention. That is, the absorbent body may have a single-layer structure including 1 superabsorbent polymer layer, or may have a multilayer structure in which two or more superabsorbent polymer layers are stacked in the thickness direction with an interlayer sheet member interposed therebetween. However, when the absorbent body has such a multilayer structure, the absorbent body can exhibit higher absorption performance corresponding to the number of layers, and as a result, there is an advantage that leakage of the excretory fluid can be made less likely to occur.

In the present invention, the outer shape, various dimensions, unit area weight, and the like of the absorber are not particularly limited as long as the effects of the present invention are not impaired, and any outer shape, various dimensions, unit area weight, and the like corresponding to desired water absorption performance, flexibility, strength, and the like can be adopted. In the case where the absorber is not formed with the aforementioned narrowing portion, the absorber may have, for example, a vertically long outer shape in which the widthwise length is constant in the longitudinal direction.

The position at which the absorber is disposed is not particularly limited as long as it is a position including the center portion in the longitudinal direction of the absorbent article, and the absorber may be disposed, for example, so as to be offset to one side in the longitudinal direction of the absorbent article.

The absorbent body may be joined to another component member such as an intermediate sheet positioned on the skin-facing surface side via an adhesive layer. When the absorbent body is joined to other constituent members via the adhesive layer in this way, the absorbent body is less likely to lose its shape during the operation of the wearer, and more excellent adhesiveness can be exhibited.

Side sheet

In the above-described disposable diaper 1, the pair of side pieces 6 are disposed on the skin-facing surface side T of the topsheet 2 so as to extend in the longitudinal direction L at both ends in the width direction of the disposable diaper 1, as shown in fig. 1 and 2 ₁ . The pair ofThe side sheets 6 are formed of a band-shaped liquid-impermeable sheet, and the liquid-impermeable sheet can be used to make the inner side W in the width direction W of the pair of side sheets 6 when the disposable diaper 1 is put on _i The end portions 61 rise to form a pair of leakage preventing wall portions.

The belt-shaped liquid-impermeable sheet forming the side sheet 6 is not particularly limited as long as it has various characteristics (for example, liquid impermeability, skin feel, flexibility, strength, and the like) that can be used as a side sheet of an absorbent article, and for example, a hydrophobic nonwoven fabric (for example, a hydrophobic or hydrophobic spunbonded nonwoven fabric, a point-bonded nonwoven fabric, an SMS nonwoven fabric, and the like), a synthetic resin film having liquid impermeability, a laminate of these materials, and the like can be used.

In the disposable diaper 1, the pair of side sheets 6 have the non-fastening portions 6 as shown in fig. 1 and 2, respectively _F And a fixed part 6 _S The above-mentioned non-fixed part 6 _F Is located on the inner side W in the width direction W _i And the end portion 61 of the front sheet 2 is not joined, and the fixing portion 6 _S And the non-fixed part 6 _F Outer side W in the width direction W of _o Adjacent to and joined to the front sheet 2, and the above-mentioned both widthwise ends of the intermediate sheet 5 (i.e., one widthwise end 5E of the intermediate sheet 5) ₁ And the other end 5E ₂ ) Are respectively positioned on the inner sides W of the pair of side pieces 6 in the width direction W in plan view _i End portion 61 and fixing portion 6 _S In between.

The two ends of the intermediate sheet 5 in the width direction are respectively positioned on the inner sides W of the pair of side sheets 6 in the width direction W in this way _i End portion 61 and fixing portion 6 _S In between, it is not easy to be on the inner side W of the side sheet 6 in the width direction W _i A gap which cannot absorb the excretory fluid is formed between the end portion 61 and the absorbent body 4, or the outer side W in the width direction W along the intermediate sheet 5 is less likely to be formed _o As a result, leakage of the excreted liquid can be made less likely.

In the present invention, the outer shape, the weight per unit area, the thickness, and the like of the side sheet are not particularly limited as long as the effects of the present invention are not impaired, and any shape, weight per unit area, thickness, and the like corresponding to desired liquid impermeability, skin touch, flexibility, and the like can be adopted.

In the present invention, it is not essential that the absorbent article includes a pair of side sheets, and therefore the absorbent article of the present invention may not include such a pair of side sheets.

In the absorbent article of the present invention, the intermediate sheet and the high-absorbency polymer layer of the absorber may have a compressed groove formed by compressing the absorbent article in the thickness direction in a region where the intermediate sheet and the high-absorbency polymer layer overlap in the thickness direction. When such a compressed groove is provided in the region where the intermediate sheet and the super absorbent polymer layer overlap, the excretory fluid is easily diffused by capillary action in the compressed groove, and therefore the absorbent article has excellent absorbability for the repeatedly supplied excretory fluid, and as a result, leakage of the excretory fluid can be made less likely to occur.

Such compressed grooves can be formed by compressing a laminate composed of at least a front sheet, an intermediate sheet, an absorber, and a back sheet in the thickness direction from the skin-facing surface side toward the non-skin-facing surface side by using processing means such as embossing known in the art.

The position and shape of the compressed groove are not particularly limited, and any position and shape can be adopted according to the desired liquid diffusibility, deformation conductivity, strength, and the like.

In addition to the tape-type disposable diaper of the above-described embodiment, the present invention can be applied to various absorbent articles such as a pants-type disposable diaper, an incontinence pad, a panty liner, and a sanitary napkin. The absorbent article of the present invention is not limited to the above-described embodiments, and various combinations, substitutions, and alterations can be appropriately made without departing from the scope of the objects and purposes of the present invention.

Description of the reference numerals

1. A disposable diaper; 2. a dough sheet; 3. a back sheet; 4. an absorbent body; 41. a superabsorbent polymer layer; 41C, a narrowing portion; 42. a core wrap sheet; 43. an interlayer sheet member; 5. an intermediate sheet; 6. a side piece.

Claims (10)

1. An absorbent article comprising a liquid-permeable front sheet, a liquid-impermeable back sheet, an absorber positioned between the two sheets, and an intermediate sheet positioned between the front sheet and the absorber, the absorbent article having a longitudinal direction, a width direction, and a thickness direction,

the absorbent body comprising a superabsorbent polymer layer and a core wrap sheet covering the superabsorbent polymer layer,

both widthwise end portions of the intermediate sheet extend outward in the widthwise direction than both widthwise end portions of the super absorbent polymer layer,

the absorber has a narrowing portion in a crotch region including the longitudinal center portion, the narrowing portion being formed by recessing both widthwise end portions of the super absorbent polymer layer inward in the widthwise direction,

the extension length of each of the portions of the intermediate sheet extending further outward in the width direction than the width direction both ends of the super absorbent polymer layer is smaller than the narrowing depth of the narrowing portion.

2. The absorbent article according to claim 1,

the intermediate sheet is formed of a water-absorbent sheet.

3. The absorbent article according to claim 1,

the intermediate sheet has a narrowed portion in a crotch region including a central portion in the longitudinal direction, the narrowed portion being formed by recessing both ends in the width direction inward in the width direction.

4. The absorbent article according to claim 3,

the central portion in the longitudinal direction at the narrowed portion of the intermediate sheet is positioned on the front side in the longitudinal direction with respect to the central portion in the longitudinal direction in the absorbent article.

5. The absorbent article according to claim 1,

the absorbent body has a narrowing portion in a crotch region including the longitudinal center portion, the narrowing portion being formed by recessing both ends in the width direction of the super absorbent polymer layer inward in the width direction.

6. The absorbent article according to claim 5,

the absorbent body is provided with a super absorbent polymer in the narrowing portion such that the weight per unit area of the super absorbent polymer decreases toward the outside in the width direction.

7. The absorbent article according to claim 5,

the absorbent body is provided with a super absorbent polymer at the narrowing portion such that the weight per unit area of the super absorbent polymer increases toward the outside in the width direction.

8. The absorbent article according to claim 1,

the absorbent article further includes a pair of side sheets extending in the longitudinal direction at both ends in the width direction and disposed on the skin-facing surface side of the top sheet,

the pair of side sheets respectively have a non-fixing portion which is located at an end portion on an inner side in the width direction and is not joined to the front sheet, and a fixing portion which is adjacent to an outer side in the width direction of the non-fixing portion and is joined to the front sheet,

the intermediate sheet has both width-direction end portions located between the width-direction inner end portions of the pair of side sheets and the fixing portion, respectively, in a plan view.

9. The absorbent article according to claim 1,

the absorbent body has a multilayer structure in which a plurality of the superabsorbent polymer layers are stacked in the thickness direction with an interlayer sheet member interposed therebetween.

10. The absorbent article according to claim 1,

the absorbent article has a compressed groove in a region where the intermediate sheet and the super absorbent polymer layer of the absorber overlap in the thickness direction, and the compressed groove is formed by compressing the absorbent article in the thickness direction.

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