JP5081793B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article including an absorbent body, a top sheet, and a back sheet. More specifically, the present invention relates to an absorbent article that can make it difficult for the excrement excreted by the wearer to adhere to the skin of the wearer.

  In general, absorbent articles such as disposable diapers and urine pads include an absorbent body, a top sheet at least partially made of a liquid-permeable material, and arranged to cover the upper surface of the absorbent body, and a liquid-impermeable material. And a back sheet disposed so as to cover the lower surface of the absorber.

  Such an absorbent article is used so that the upper surface of the top sheet is in contact with the skin of the wearer, and excrement excreted by the wearer is absorbed and held by the absorbent through the liquid-permeable portion of the top sheet. The And it is prevented that excrement leaks outside the absorptive article by the liquid impermeable back sheet arranged at the lower surface side of the absorber.

  As such a conventional absorbent article, as a means for preventing the side leakage of excretory fluid, a leakproof wall was formed by folding the absorbent body as disclosed in, for example, Patent Document 1, provided with a three-dimensional gather. Things are known.

JP 2008-23365 A

  However, a conventional absorbent article having such a three-dimensional gather or a leak-proof wall is applied so that the absorbent body and the top sheet disposed on the upper surface side thereof are in close contact with the wearer's body when worn. Therefore, the excrement excreted by the wearer adheres to the skin of the wearer before being absorbed and held by the absorbent body. For this reason, there is a problem in that not only does it cause the wearer's skin to become dirty and uncomfortable, but skin troubles such as eczema, rash and rash may occur.

  In addition, since the conventional absorbent article is too close to the wearer's skin and the absorbent body, the three-dimensional gathers or leak-proof walls formed on both sides of the absorbent body do not function in a sufficiently upright state and are excreted. In addition to the problem that the side leakage of the liquid cannot be completely prevented, the formation of the leak-proof wall by folding is complicated to manufacture and is not suitable for mass production.

  The present invention has been made to solve such problems of the prior art, and makes it difficult for the wearer's excretion to adhere to the wearer's skin when the absorbent article is worn. The present invention provides a disposable diaper having a simple structure that can be used.

  As a result of intensive studies to solve the problems of the prior art as described above, the absorbent article provided with the absorber, the top sheet, and the back sheet is symmetrical in the longitudinal direction of the back sheet. By providing a long belt-like elastic body and having the portion sandwiched between the left and right elastic bodies at the crotch part of the absorbent article bulge downward according to the contraction of the elastic body at the time of wearing The present invention has been completed by conceiving that the above problems can be solved. Specifically, the following absorbent articles are provided by the present invention.

[1] A top sheet formed from each part of the front body, the crotch part, and the back body, an absorbent body, and at least a part made of a liquid-permeable material, and disposed so as to cover the upper surface of the absorbent body; A back sheet made of a liquid-impermeable material and disposed so as to cover the lower surface of the absorbent body, and the absorbent body is divided into three equal parts perpendicular to the longitudinal direction at the center. In a certain crotch region, a fold line capable of bending the absorbent body perpendicularly to the longitudinal direction is formed, and a long belt-like elastic body is formed on the surface of the back sheet that is in contact with the absorbent body or on the opposite surface. A portion corresponding to a left and right edge region excluding a central region of one of the surfaces of the back sheet, which is divided into three equal parts in parallel with the longitudinal direction, along the longitudinal direction of any one surface In addition, the expansion ratio is 150 to 40 symmetrically. It is arranged in the stretched state within the range of 0%, and the length of the stretched state at the time of placement is shorter than 2/3 of the longitudinal length of the absorbent body and longer than 1/4 , An absorbent article having a configuration in which a portion of the absorbent body sandwiched between the elastic bodies bulges downward and a space is formed in the crotch of the wearer.

[ 2 ] The absorbent article according to [1 ] , which is a tape-type disposable diaper.

  The absorbent article of the present invention can make it difficult for the wearer's excretion to adhere to the wearer's skin when worn. Therefore, the wearer's skin is hardly contaminated with excrement, and the absorbent article can be used comfortably, and the occurrence of skin troubles such as eczema, rash and rash can be suppressed. Moreover, the absorbent article of this invention can function a three-dimensional gather effectively in a standing state, and can prevent the side leakage of excretory fluid effectively.

  BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the best mode for carrying out the present invention will be specifically described. However, the present invention is not limited to the following embodiment, and is within the scope of the present invention without departing from the spirit of the present invention. It should be understood that design changes, improvements, etc. can be made as appropriate based on knowledge.

The absorbent article of the present invention is formed from each part of the front body, the crotch part, and the back body. The absorbent body and at least a part are made of a liquid-permeable material, and are arranged so as to cover the upper surface of the absorbent body. A top sheet and a back sheet made of a liquid-impermeable material and disposed so as to cover the lower surface of the absorber, the absorber being divided into three equal parts perpendicular to the longitudinal direction In the crotch region in the center, a fold line is formed so that the absorbent body can be folded perpendicularly to the longitudinal direction, and the long belt-like elastic body is in contact with the absorbent body of the backsheet or the opposite surface Along the longitudinal direction of any one of the surfaces, the left and right edge regions of any one of the surfaces of the backsheet, excluding the central region of the absorber divided into three equal parts in parallel with the longitudinal direction. in part, stretching to the left and right symmetry rate 150-40 % Is disposed in a stretched state in the range of shorter length of the stretched state during placement than the longitudinal 2/3 of the length of the absorbent body, by longer than 1/4, when worn, The absorbent article has a configuration in which a portion of the absorbent body sandwiched between the elastic bodies bulges downward and a space is formed in the crotch of the wearer.

  Here, the “upper surface of the absorbent body” refers to a surface facing the inner direction of the absorbent article (direction in contact with the body) at the time of wearing, and the “lower surface of the absorbent body” refers to the absorbent article at the time of wearing. It refers to the surface facing the outside direction (direction in contact with clothes). “Lower side” also refers to the outer side direction (the direction in contact with clothes) of the absorbent article when worn. The “longitudinal direction” means the front-rear direction of the absorbent article (the direction connecting the front body side and the back body side), and “left and right” means the width direction of the absorbent body when facing the longitudinal direction. It means the left and right of (the direction perpendicular to the longitudinal direction).

  The absorbent article of the present invention is characterized in that a long belt-like elastic body is arranged in a symmetrically stretched state on the back sheet, and the absorbent article other than the elastic body is arranged. The structure is not particularly limited as long as it includes an absorbent body, a top sheet, and a back sheet. For example, the structure may be a tape-type disposable diaper or a pants-type disposable diaper. . Moreover, in the case of a disposable diaper of a tape type or a pants type, it may be a one-piece type or a two-piece type. Furthermore, it is not limited to a tape-type or pants-type disposable diaper, but may be a urine pad or the like.

  In the present specification, the “pants-type disposable diaper” includes, for example, an absorbent body 22, a top sheet 18, and a back sheet 20, as in the absorbent article 1 </ b> A illustrated in FIGS. 1A to 1C. The corresponding side edge portions 2a, 6a (2b, 6b) of the body 2 and the back body 6 are joined together to form a joint portion 8, one waist opening 10 and a pair of leg openings 12 (12a, 12b). By forming, it means a disposable diaper configured in a pants shape in advance. FIG. 1A is a schematic plan view showing a state in which one embodiment of the absorbent article of the present invention is developed and seen from the top sheet side, and FIG. 1B is a cross-sectional view taken along line AA ′ of the absorbent article shown in FIG. 1A. FIG. 1C is a schematic perspective view showing a state in which the absorbent article shown in FIG. 1A is assembled and viewed from the front side.

  On the other hand, in this specification, “tape-type disposable diaper” includes an absorbent body 22, a top sheet 18, and a back sheet 20, as in the absorbent article 1 </ b> B shown in FIGS. 2A and 2B. Along with the fastening tape 11 for fixing the front body 2 and the back body 6 at the time of wearing, which are arranged so as to extend from the left and right side edge portions 6a, 6b, and the end of the front body 2 It shall mean a disposable diaper further provided with a front patch 13 which is disposed at the center in the width direction and which fastens the fastening tape 11. 2A is a schematic plan view showing another embodiment of the absorbent article of the present invention as viewed from the top sheet side, and FIG. 2B is a cross-sectional view taken along the line AA ′ of the absorbent article shown in FIG. 2A. It is a schematic sectional drawing shown.

  The “one-piece type” includes the absorbent body 22, the top sheet 18, and the back sheet 20 as in the absorbent article 1 </ b> B shown in FIGS. Means a diaper of a type in which the body 22 is integrally interposed (built in) between the top sheet 18 and the back sheet 20, and the top sheet 18 and / or the back sheet 20 is configured to perform the mounting function; To do.

  The “two-piece type” refers to the absorbent main body 14 in which the absorbent body 22, the top sheet 18, and the back sheet 20 are integrated into a pad shape like the absorbent article 1 </ b> A shown in FIGS. 1A and 1B. It is meant to be a diaper that includes an exterior member 16 that encloses the wearer's body and in which the absorbent main body 14 is disposed and fixed inside the exterior member 16.

  Further, in the present specification, the “front body” means a part covering the abdomen side (front of the body) of the wearer when the absorbent article is attached to the wearer, and the “inseam” means that the wearer is absorbent. The part that covers the inseam of the wearer when the article is attached, “the back body” means the part that covers the back side (back of the body) of the wearer when the absorbent article is attached to the wearer And

  Hereinafter, as an embodiment of the absorbent article of the present invention, a two-piece type pants-type disposable diaper and a one-piece type tape-type diaper will be described more specifically.

[1] Structure of the characteristic part of the absorbent article of the present invention:
As shown in FIG. 1A, FIG. 1B, FIG. 2A, and FIG. 2B, the absorbent article of the present invention has a surface in which the long belt-like elastic body 15 is in contact with the absorbent body 22 of the backsheet 20 or the opposite surface. It is characterized in that it is arranged in a symmetrically extended state in a portion corresponding to the inner side of both longitudinal edges of the absorbent body 22 along the longitudinal direction of any one of the surfaces. By adopting such a configuration, at the time of wearing, the portion sandwiched between the elastic bodies 15 of the absorbent body 22 bulges downward to form a space in the wearer's crotch, and the top sheet 18 and the absorbent body 22 and the skin Can be avoided.

  That is, when the elongated belt-like elastic body is disposed in the stretched state along the longitudinal direction of the back sheet as described above, a force that contracts in the front-rear direction acts on the absorbent body, and the front body side of the absorbent body and The back body side warps upward and stands up three-dimensionally. At that time, the portion sandwiched between the elastic bodies at the left and right of the absorbent body bulges downward, and as a result, the crotch part of the absorbent article can be bulged downward and contains excrement. A large volume of the internal space can be secured. Therefore, it is possible to avoid the excretion excreted by the wearer from adhering to the wearer's skin before being absorbed and held by the absorber.

  Further, as shown in FIG. 3, the absorbent article of the present invention has a central region in which the elastic body 15 is divided into three equal parts in parallel with the longitudinal direction of the absorbent body 22 on either side of the backsheet 20. It is preferable that the left and right end edge regions 101 (101a and 101b) excluding 100 are arranged in portions corresponding to the left and right end edge regions 101. By arrange | positioning the elastic body 15 in such a position, the center part of an absorber can fully bulge below. FIG. 3 is a plan view schematically showing one embodiment of an absorbent body used in the absorbent article of the present invention. In FIG. 3, the back sheet that is originally located below the absorber and on which the elastic body is arranged is omitted from the drawing.

Further, as shown in FIG. 4, the absorbent article of the present invention has an absorbent body 22 perpendicular to the longitudinal direction in the crotch region 104 in the center of the absorbent body 22 divided into three equal parts perpendicular to the longitudinal direction. foldable folding line 50 that is formed. By forming such a fold line 50 in the absorbent body 22, the front body side region 102 and the back body side region 106 of the absorbent body 22 are surely raised upward. The space can be secured satisfactorily. In addition, FIG. 4 is a top view which shows typically one Embodiment of the absorber which has a fold line used for the absorbent article of this invention.

[1-1] Elastic body:
The absorbent article of the present invention has a long belt-like elasticity along the longitudinal direction of either the surface (back sheet upper surface) in contact with the absorber of the back sheet (back sheet upper surface) or the opposite surface (back sheet lower surface). The body is disposed in a stretched state in a symmetrical manner in a portion corresponding to the inner side of both side edges in the longitudinal direction of the absorbent body. With such a configuration, the elastic body arranged in advance in a stretched state exerts a force of contracting in the front-rear direction of the absorbent article at the time of wearing, so the inseam of the absorbent article centering on the absorbent body In the portion, the portion sandwiched between the left and right elastic bodies forms a bulge downward by the contraction force.

  The elastic bodies are preferably arranged symmetrically along the longitudinal direction of any one surface of the backsheet, and the number of arrangement is not particularly limited. A plurality of them may be arranged on the left and right as long as an appropriate contraction force can be exerted without overtightening.

The elastic body, the one side of the backsheet, Ru is disposed in a portion corresponding to the left and right edge regions except the center region of the absorbent body was parallel to three equal parts in the longitudinal direction. In this way, by arranging the elastic body at a position where the left and right elastic bodies sandwich the central portion of the absorbent body, the central portion of the absorbent body naturally bulges downward, so the skin and excretion of the wearer It becomes possible to effectively prevent contact of objects.

  Regarding the properties of the elastic body, the constituent material, the tensile force of the material, the elongation rate at the time of fixation, and the like may be determined in consideration of the degree of shrinkage of the absorber.

  As the elastic material, materials that have been used in conventional absorbent articles can be suitably used. Specific examples include elastic rubber, elastic film, elastic foam (urethane foam, etc.), etc. in addition to natural rubber flat rubber and synthetic rubber (urethane rubber, etc.) elastic thread. it can.

Elastic body for applying a sufficient stretching force, Ru is disposed to the back sheet at a stretched state. For example, in the case where the elastic body is a flat rubber made of natural rubber or a thread rubber made of an elastic thread of synthetic rubber, the elastic body is preferably arranged at an elongation of 150 to 400%, and at an elongation of 200 to 300%. More preferably, it is arranged. By arranging in an extended state in such a range, a sufficient stretching force can be applied to the absorbent body without exerting an excessive tightening force on the wearer's body.

  The elastic body as described above is fixed to the back sheet by an adhesive or other means. The fixing method may be, for example, adhesion using a hot melt adhesive or other highly fluid adhesive, or may be welding by heat such as heat sealing or ultrasonic waves. 2A and 2B, when the cover sheet 24 is provided on the outer surface side of the back sheet 20, the elastic body 15 is sandwiched between the back sheet 20 and the cover sheet 24. It can also be bonded at the same time.

Elastic body, the length of the stretched state during placement shorter than the longitudinal 2/3 of the length of the absorbent body, has a length than 1/4. If the length of the stretched state at the time of placement is longer than 2/3 of the length in the longitudinal direction of the absorbent body, excessive shrinkage force is generated in the front-rear direction of the absorbent article, giving the wearer a feeling of tightening and close contact May cause discomfort. Moreover, the excessive shrinkage | contraction of an absorbent article does not correspond with achievement of the subject of this invention of making it difficult to adhere excrement to a wearer's skin.

[2] Configuration of other parts of the absorbent article of the present invention:
[2-1] Absorber:
The absorber is a member for absorbing and holding the wearer's urine. The absorber is made of an absorbent material because it needs to absorb and retain the wearer's urine and body fluid.

  Examples of the absorbent material constituting the absorber include conventionally known absorbent materials usually used for disposable diapers and other absorbent articles, such as fluff pulp, super absorbent polymer (Super Absorbent Polymer; hereinafter referred to as “SAP”). And a hydrophilic sheet. Use fluff pulp made of wood pulp or non-wood pulp defibrated, SAP as sodium polyacrylate, hydrophilic sheet as tissue paper, absorbent paper, hydrophilized non-woven fabric Is preferred.

  These absorbent materials are usually used as a single-layer or multi-layer mat. Under the present circumstances, 1 type may be used independently among the said absorptive materials, and 2 or more types may be used together. Especially, what used together about 10-500 mass parts SAP with respect to 100 mass parts of fluff pulp is preferable. At this time, the SAP may be uniformly mixed in each mat of fluff pulp, or may be arranged in layers between the layers of the multilayer fluff pulp.

  In addition, a sheet (second sheet) for diffusing liquid such as urine and body fluid may be incidentally disposed on the surface side of the absorber (for example, between the absorber and the top sheet). . When this second sheet is attached, due to the wearer's posture, etc., even when the space on the back side of the top sheet is not sufficiently formed, the absorption rate of urine, body fluid, etc. is difficult to decrease, and the absorption rate decreases. It is possible to prevent leakage of urine and body fluids.

  Examples of the material constituting the second sheet include hydrophilic and liquid-permeable materials such as woven fabric, non-woven fabric, porous plastic, and fluff pulp. Examples of these constituent materials include polypropylene, polyethylene, polyester, rayon, acetate, or composite fibers thereof, and pulp. As the pulp, crimped fibers such as curly cellulose fibers can be suitably used.

  Although there is no restriction | limiting in particular about the shape of an absorber, The shape used in the conventional absorbent article, for example, a rectangular shape, an hourglass type, a gourd type, a T shape etc. can be mentioned.

  The entire absorbent body is preferably encapsulated by a hydrophilic sheet. Such a configuration has an advantage that SAP can be prevented from leaking from the absorber and shape stability can be imparted to the absorber.

  Usually, the absorber is interposed between the top sheet and the back sheet by being sandwiched between the top sheet and the back sheet and sealing the peripheral edge thereof. Therefore, the flap part in which the absorber is not interposed is formed between the top sheet and the back sheet at the peripheral part of the absorber. The absorbent body may be interposed at least in the crotch region, and the absorbent body may extend to the front body and the back body.

As shown in FIG. 4, the absorbent article of the present invention can be folded perpendicularly to the longitudinal direction in the crotch region 104 in the center of the absorbent body 22 divided into three equal parts perpendicular to the longitudinal direction. Although Do folding lines 50 that are formed, such folding line 50, as long as it is possible to reliably erected front body side region 102 and the rear body side region 106 of the absorbent body 22, in particular its shape Ya The formation method is not limited. For example, there are a method of forming a linear thin portion in a portion to be bent by applying a pressing process to the absorber 22, a method of forming an intermittent thin portion by applying an embossing process, and the like.

[2-2] Top sheet:
A top sheet is a sheet | seat arrange | positioned so that the upper surface (surface of a wearer's skin at the time of mounting | wearing of an absorbent article) of an absorber may be coat | covered. At least a part (all or a part) of the top sheet is made of a liquid-permeable material because the absorber disposed on the lower surface side needs to absorb the excretion fluid of the wearer.

  Examples of the liquid permeable material constituting the top sheet include a woven fabric, a nonwoven fabric, and a porous film. Among these, it is preferable to use a non-woven fabric made of a thermoplastic resin such as polypropylene, polyethylene, polyester, or nylon and subjected to a hydrophilic treatment.

  The top sheet may be composed of a single sheet material, but may be composed of a plurality of sheet materials. For example, in a tape-type disposable diaper, as shown in FIG. 2A, a top sheet 18 (center sheet 18a) made of a liquid-permeable material is disposed at the center of the diaper, and a water repellency is formed on the side flap 9 of the diaper. The form which arrange | positions the top sheet 18 (side sheet 18b) which consists of material is utilized well.

  As the water-repellent material constituting the side sheet, non-woven fabric such as spunbond or card embossing can be used. Among these, nonwoven fabrics such as SMS (spunbond / meltblown / spunbond) and SMMS (spunbond / meltblown / meltblown / spunbond) have the advantage of high water pressure resistance and can be suitably used.

[2-3] Backsheet:
A backsheet is a sheet | seat arrange | positioned so that the lower surface (surface of a wearer's clothing side at the time of mounting | wearing of an absorbent article) of an absorber may be coat | covered. The back sheet is made of a liquid-impermeable material because it is necessary to prevent the excretion fluid of the wearer from leaking outside the absorbent article.

  Examples of the liquid-impermeable material constituting the backsheet include a liquid-impermeable film made of a resin such as polyethylene. Among these, a microporous polyethylene film is preferably used. This microporous polyethylene film has a large number of fine pores of 0.1 to several μm, and is liquid-impermeable but has moisture permeability, so it is possible to prevent stuffiness inside the absorbent article. There is an advantage.

  In a one-piece type disposable diaper, a sheet material (cover sheet 24) may be bonded to the outer surface of the back sheet 20 like the absorbent article 1B shown in FIGS. 2A and 2B. . The cover sheet 24 is used to reinforce the back sheet 20 and improve the touch (feel) of the back sheet 20.

  Examples of the material constituting the cover sheet include woven fabric and non-woven fabric. Especially, it is preferable to use the dry nonwoven fabric and wet nonwoven fabric which consist of thermoplastic resins, such as polyethylene, a polypropylene, and polyester.

  In the absorbent article of the present invention, the elastic body is disposed on the upper surface (the surface in contact with the absorber) of the back sheet or the lower surface that is the opposite surface, but the absorbent article 1B shown in FIGS. 2A and 2B Thus, in a one-piece type disposable diaper having a cover sheet 24, when an elastic body is disposed on the lower surface of the back sheet, the elastic body 15 is sandwiched between the lower surface of the back sheet 20 and the cover sheet 24. Are arranged as follows.

  In the two-piece type disposable diaper, the absorbent body 22, the top sheet 18, and the back sheet 20 are integrated into a pad shape like the absorbent article 1 </ b> A shown in FIGS. 1A to 1C, and the absorbent main body 14. The absorptive main body 14 may be arranged and fixed inside the exterior member 16. The exterior member 16 is used to encapsulate the wearer's body while fixing the absorbent body 14.

  An absorptive main body can be manufactured by inserting an absorber between a top sheet and a back sheet and sealing the peripheral edge of the absorber. An absorptive main body is comprised by the size which covers at least the crotch part of a diaper. However, in order to ensure the effect of preventing leakage, it is preferable to have a size that covers not only the crotch part but also a part of the front body and the back body. The absorptive main body can be fixed to the exterior member using, for example, a hot melt adhesive.

  On the other hand, the exterior member is a sheet-like member that forms the front body, the crotch part, and the back body. In the two-piece type tape-type diapers and pants-type diapers, the absorbent main body will serve exclusively for the absorption and retention function of absorbing and retaining the wearer's excretion fluid. There is no need to use a liquid-impermeable material. Examples of the material constituting the exterior member include a nonwoven fabric composed of synthetic fibers made of polyethylene, polypropylene, polyester, and other thermoplastic resins.

[2-4] Solid gathering:
The absorbent article of the present invention is, for example, the longitudinal direction of the absorbent body 22 on the surface of the top sheet 18 like the absorbent article 1A shown in FIGS. 1A and 1B and the absorbent article 1B shown in FIGS. 2A and 2B. It is preferable that a three-dimensional gather 26 composed of a water-repellent sheet 32 (32a, 32b) and configured to stand up three-dimensionally is provided along both side edges in the direction.

  The three-dimensional gather is a member for preventing side leakage of excreted fluid excreted by the wearer, and is a leak-proof wall configured to be able to stand up three-dimensionally. By forming this three-dimensional gather, the three-dimensional gather becomes a breakwater, and the leakage of excretory fluid around the legs (so-called “lateral leakage”) can be prevented. In the present invention, the excrement excreted by the wearer is temporarily held in a space (gap) formed by the downward swelling of the central portion of the absorbent body due to the contraction of the elastic body and the standing portion of the three-dimensional gather. In addition to making it difficult for the excrement to adhere to the skin of the wearer, since the three-dimensional gather functions normally in the standing state, the side leakage of the excretory liquid is further effectively prevented.

  The structure used for the conventional absorbent article can be adopted as the structure of the three-dimensional gather. For example, it is possible to suitably use a material in which a stretchable material (a three-dimensional gathered stretchable material) is arranged on a part of the sheet material, and a gather is formed on the sheet material by the three-dimensional gathered stretchable material.

  As the sheet material constituting the three-dimensional gather, it is preferable to use a sheet made of a water-repellent material (water-repellent sheet) from the viewpoint of improving the leak-proof property of the three-dimensional gather.

  As the three-dimensional gather stretchable material, stretchable materials that have been used in conventional absorbent articles can be suitably used. Specific examples include elastic rubber, elastic film, elastic foam (urethane foam, etc.), etc., as well as thread rubber and flat rubber made of elastic materials such as natural rubber and synthetic rubber (urethane rubber, etc.). .

  The types of three-dimensional gathers are: (1) Inverted gathers that tilt toward the inner side of the absorbent article, (2) Outer gathers that tilt toward the outer side of the absorbent article, and (3) Part of the height direction In addition, a three-dimensional gather (such as a C-fold gather or a Z-fold gather) having a bent portion or a folded portion may be used. Among these, inversion gathers are particularly preferable in terms of high leakage prevention.

  In addition, “along both side edges in the longitudinal direction of the absorber” means that a three-dimensional gather is provided in the same direction as both side edges in the longitudinal direction of the absorber. However, the side edge of the absorber may be formed in a curved line along the leg opening, and is not necessarily formed in a straight line. Therefore, the three-dimensional gather does not necessarily need to be attached so as to be in contact with the side edge of the absorber, and does not have to be attached so as to draw the same locus as the side edge of the absorber. Usually, a three-dimensional gather is often arranged linearly regardless of the shape of the absorber.

[2-5] Various elastic materials:
In the absorbent article, various elastic materials are arranged for the purpose of preventing leakage and improving fit. In the case of the absorbent article of the present invention, for example, in the case of a tape-type disposable diaper, as in the absorbent article 1B shown in FIGS. 2A and 2B, the leg-around elastic material 40 and the waist-around elastic material 42 are arranged. It is preferable. On the other hand, in the case of a pants-type disposable diaper, it is preferable that an abdominal circumference stretchable material 44 is further arranged in addition to these as in the absorbent article 1A shown in FIGS.

  The leg-surrounding stretchable material is a stretchable material disposed in the leg-surrounding opening. By arranging the leg-stretchable material, a gather (leg gather) rich in stretchability can be formed in the leg-surrounding opening. Therefore, it becomes difficult to form a gap around the legs, and it is possible to effectively prevent side leakage of excretory fluid from the openings around the legs.

  In the case of a pants-type disposable diaper, the leg-surrounding elastic member 40 adopts a configuration in which the leg-surrounding material 40 is arranged in a curved line along the trajectory of the leg-hole opening 12 (12a, 12b) as shown in FIG. 1A. On the other hand, in the case of a tape-type disposable diaper, as shown in FIG. 2A, it is possible to employ a configuration in which it is linearly arranged so as to be inscribed in the leg opening 12 (12a, 12b).

  A waist circumference elastic material is an elastic material arrange | positioned at a waist circumference opening part. By arranging the elastic material around the waist, a gather (waist gather) rich in elasticity can be formed in the opening around the waist. This waist gather makes it difficult for gaps to be formed around the waist, preventing leakage of excretory fluid from around the waist, as well as improving the fit of the diaper to the wearer and preventing the diaper from falling down. The

  If the waist stretchable material 42 is a pants-type disposable diaper, as shown in FIGS. 1A and 1C, a long belt-shaped stretchable material (thread rubber, flat rubber, etc.) is formed along the waist circumference opening 10. In the case of a tape-type disposable diaper, on the other hand, at least along the end of the absorbent article on the back body side, preferably the back body side and the front body A configuration in which a belt-like stretchable material (urethane foam or the like) is arranged at the center in the width direction along the side end can be employed.

  An abdominal circumference elastic material is an elastic material arrange | positioned in the part (namely, part corresponding to a wearer's abdominal circumference) between the waist circumference opening part and leg leg opening part of a pants type disposable diaper. By arranging the elastic material around the abdomen, it is possible to form a highly elastic tammy gather around the abdomen of the wearer. This Tammy Gather, together with West Gather, can make the diaper fit and anti-slip effect even better.

  About these elastic materials, the structure similar to the three-dimensional gather elastic material already described can be employ | adopted. Then, after considering the degree of gather contraction and the like, the constituent material, the stretch rate of the material, the stretched state at the time of fixing, etc. may be determined.

[3] Application target of absorbent article of the present invention:
The application target of the absorbent article of the present invention is not limited to the two-piece type pants-type diaper and the one-piece type tape-type diaper described so far. Although it can be applied to a piece-type tape-type diaper, it is particularly preferable to apply to a tape-type diaper. Moreover, it can also be applied to a urine pad or the like used by being placed in the crotch part of a diaper or the like.

  That is, even in disposable diapers and urine pads other than the disposable diapers described so far, the elongated belt-like elastic body is arranged in a symmetrically extended state along the longitudinal direction of the backsheet, thereby The same effect as a disposable diaper can be obtained.

  The “urine pad” is also called an inner pad or an auxiliary pad, and is an absorption pad exclusively for urine absorption. This urine pad is used in a state of being placed on the inner surface of the underwear or the surface of the top sheet of the disposable diaper. Like a disposable diaper, a urine pad includes an absorbent body, a top sheet disposed so as to cover the upper surface of the absorbent body, and a back sheet disposed so as to cover the lower surface of the absorbent body. Generally, it is configured in a small pad shape that does not have a portion that encloses a person's waist.

  The absorbent article of the present invention makes it difficult for the wearer's skin to become dirty with excrement, maintains a comfortable feeling of use, suppresses the occurrence of skin troubles, and can effectively prevent side leakage of excretory fluid. It can be suitably used as an absorbent article such as a disposable diaper or an urine pad for infants or adults such as elderly people and persons with disabilities who need care.

It is a schematic plan view which shows the state which developed one Embodiment of the absorbent article of this invention, and was seen from the top sheet side. It is a schematic sectional drawing which shows the A-A 'cross section of the absorbent article shown to FIG. 1A. It is a schematic perspective view which shows the state which assembled the absorbent article shown to FIG. 1A and was seen from the front side. It is a schematic plan view which shows the state which looked at another embodiment of the absorbent article of this invention from the top sheet side. It is a schematic sectional drawing which shows the A-A 'cross section of the absorbent article shown to FIG. 2A. It is a top view which shows typically one Embodiment of the absorber used for the absorbent article of this invention. It is a top view which shows typically one Embodiment of the absorber which has a fold line used for the absorbent article of this invention.

Explanation of symbols

1A, 1B: Absorbent article, 2: Front body, 2a, 2b: Side edge, 4: Crotch, 6: Rear body, 6a, 6b: Side edge, 8: Joint, 9: Side flap, 10 : Opening around waist, 11: fastening tape, 12, 12a, 12b: opening around leg, 13: front patch, 14: absorbent main body, 15, 15a, 15b: elastic body, 16: exterior member, 18: Top sheet, 18a: Center sheet, 18b: Side sheet, 20: Back sheet, 22: Absorber, 24: Cover sheet, 26, 26a, 26b: Solid gather, 32, 32a, 32b: Water repellent sheet, 36, 36a 36b: Three-dimensional gather elastic material, 40, 40a, 40b: Elastic material around the leg, 42: Elastic material around the waist, 44: Elastic material around the abdomen, 50: Folding line, 100: Central region, 101, 101a 101b: edge regions, 102: front body side region 104: crotch region, 106: rear body side region.

Claims (2)

It is formed from each part of the front body, the crotch, and the back body,
An absorbent body, a top sheet that is at least partially made of a liquid-permeable material and arranged to cover the upper surface of the absorbent body, and a liquid-impermeable material that covers the lower surface of the absorbent body With a backsheet arranged,
The absorbent body is formed by dividing the absorbent body into three equal parts perpendicular to the longitudinal direction, and in the crotch region in the center, a fold line that can bend the absorbent body perpendicular to the longitudinal direction is formed.
The absorption of one of the surfaces of the backsheet along the longitudinal direction of either the surface of the backsheet that is in contact with the absorber or the surface on the opposite side thereof The body is divided into three equal parts in parallel to the longitudinal direction, and the part corresponding to the left and right edge regions excluding the central region is arranged symmetrically in a stretched state within a stretch rate of 150 to 400% . The length of the stretched state is shorter than 2/3 of the longitudinal length of the absorbent body and longer than 1/4 , so that the portion sandwiched between the elastic bodies of the absorbent body is the lower side when worn. An absorbent article having a configuration in which a space is formed in the inseam of the wearer. The absorptive article according to claim 1 which is a tape type disposable diaper.

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