JP5780757B2 - Absorbent articles - Google Patents

Description

  The present invention relates to absorbent articles such as sanitary napkins, panty liners, incontinence pads, etc. for absorbing menstrual blood or vaginal discharge. The present invention relates to an absorbent article in which a mid-high portion is formed.

  Conventionally, as absorbent articles such as sanitary napkins, panty liners, incontinence pads, liquid-impervious back sheet such as polyethylene sheet or polyethylene laminate sheet nonwoven fabric, and liquid-permeable surface sheet such as nonwoven fabric or liquid-permeable plastic sheet There is known an intervening absorber made of cotton-like pulp or the like.

  In this type of absorbent article, in order to increase the degree of adhesion with the surface of the body, an article having a high-absorbent medium-high portion on the use surface side at the center in the width direction of the absorbent article has been proposed.

  For example, in the following Patent Document 1, the absorber is composed of an upper absorbent layer and a lower absorbent layer, the lower absorbent layer has an opening in the center in the width direction, and the upper absorbent layer is the width of the absorbent article. An absorbent article is disclosed that spans both sides of the opening in the direction. Moreover, in the following patent document 2, each side part of the absorbent body is folded back to the center side in the width direction of the absorbent body and to the non-skin contact surface side in the thickness direction, so that the side part is in the thickness direction rather than the core part. An absorptive article is disclosed in which the height is increased and a space is formed between the core and the back sheet.

  In the absorbent article having such a middle-high part, by receiving a compressive force toward the inner side from the thigh when wearing the absorbent article, the middle-high part is deformed so as to rise to the skin contact surface side, When the raised portion is in close contact with the vicinity of the blood outlet, menstrual blood or the like can be absorbed.

JP 2006-115996 A JP 2008-125918 A

  However, in an absorbent article in which a high-absorber medium-high part is formed on the skin contact surface side, when the folding line that folds the absorbent article in the longitudinal direction is applied to the middle-high part during individual packaging, the outer surface side and the inner surface side in the middle-high part As a result, the wrinkle is tightly formed because the difference in the circumference of the body is partly increased, so even if it receives compression force from the thigh when worn, the middle and high parts do not rise effectively and the fit with the body is good There is a risk that the function of the middle and high parts may be impaired, for example, the leakage may occur.

  Moreover, in the absorbent article described in Patent Documents 1 and 2, in the individually packaged state in which the absorbent article is folded in the longitudinal direction, the portion where the absorbent bodies such as the middle and high parts are stacked is bulky, so the thickness of the individual package is thick. There was a problem that portability was bad.

  Therefore, a main problem of the present invention is to provide an absorbent article that does not deteriorate the function of the middle and high parts that fits the body at the time of wearing and prevents leakage, and that can be made compact in an individual packaging state.

In order to solve the above problems, as the present invention according to claim 1, an absorbent article in which an absorbent body is interposed between a back sheet and a liquid-permeable top sheet,
The absorbent body is disposed from the front side to the rear side of the absorbent article, and has a base material absorbent body having an opening corresponding to the blood drainage port of the wearer. And composed of a medium-high absorber formed at a height substantially equal to the base material absorber,
When receiving a compressive force directed from the outside in the width direction to the inside when installed, the gap between the side walls of the opening is narrowed, and the absorbent body for the base material on both sides of the opening enters the lower side of the absorbent body for middle and high By the above, the absorber for middle and high can protrude toward the skin contact surface side,
Wherein the lower side of the base material for the absorbent body and the opening is disposed hydrophilic sheet made of nonwoven fabric, the hydrophilic sheet, the absorbent body side for the medium and high in the longitudinal direction in only the central portion in the width direction of the opening The absorbent article is constructed such that the hydrophilic sheet is pulled up together with the mid-high absorber by moving the mid-high absorber to the skin contact surface side when being joined. Is provided.

  In the first aspect of the present invention, as the absorbent body, an absorbent body for a substrate having an opening in a region corresponding to the blood drainage port of the wearer disposed from the front side to the rear side of the absorbent article, In the mounted state, a medium / high-absorbent body that is fitted into the opening and formed at a height substantially equal to the base-material absorber is used. And, when receiving a compressive force directed from the outside in the width direction to the inside at the time of mounting, the space between the both side walls of the opening is narrowed so that the medium-high absorber is pushed away, and the base material absorber on both sides of the opening Is inserted into the lower side of the middle-high absorber, so that the middle-high absorber can protrude toward the skin contact surface side. Thus, in the absorbent article according to the present invention, in the individual packaging state, the middle and high portions of the high absorbent body are not formed on the use surface side, and the compressive force from the outer side in the width direction is received when the absorbent body is mounted. Since the middle-high absorbent body fitted in the opening moves to the skin contact surface side to form the middle-high part, even if the absorbent article is folded in the longitudinal direction in the individual packaging state, the middle-high part is folded. The wrinkles do not become tight, so that the problem of lowering the function of the middle and high parts such as the rise of the middle and high parts being restricted and the fitting performance being reduced and leakage occurring can be prevented.

  Moreover, since the middle and high parts of the absorber are not formed in the individually packaged state, the individual package becomes compact and the portability is excellent.

In the first aspect of the present invention, a hydrophilic sheet made of a non-woven fabric is disposed below the absorbent body for the base material and the opening, and the hydrophilic sheet is long only at the center in the width direction of the opening. By joining to the middle / high absorber side along the direction, when the middle / high absorber moves toward the skin contact surface side at the time of wearing, the body fluid absorbed by the middle / high absorber passes through the hydrophilic sheet. It is easy to shift to the absorbent body for a base material.

  As the present invention according to claim 2, at least both side walls in the opening and / or the medium-high use, which serve as a sliding surface between the base-material absorber and the medium-high absorber when receiving the compressive force. The absorbent article according to claim 1, wherein both side portions of the absorbent body are subjected to a low friction treatment for reducing frictional resistance.

  In the invention described in claim 2, at least both side wall portions in the opening and / or the medium-high height, which serve as a sliding surface between the base material absorber and the medium-high absorber when receiving the compressive force. By applying a low-friction process that reduces the frictional resistance to both side surfaces of the absorber, when receiving a compressive force from the outer side in the width direction to the inner side during mounting, the absorber for the base material near the opening is for medium-high Since it smoothly enters the lower side of the absorbent body, the middle-high absorbent body is easily moved toward the skin contact surface side.

  As this invention which concerns on Claim 3, the said opening is formed so that the opening width may become small gradually toward the longitudinal direction both ends side of the said absorbent article, The absorptivity in any one of Claims 1-2. Articles are provided.

  The invention described in claim 3 defines the planar shape of the opening, and is formed in such a shape that the opening width gradually decreases toward both ends in the longitudinal direction of the absorbent article. Thereby, when receiving a compressive force directed from the outer side in the width direction toward the inner side at the time of mounting, the interval between the both side walls of the opening tends to be narrowed.

  As an aspect of the present invention according to claim 4, there is provided the absorbent article according to any one of claims 1 to 3, wherein the side surface of the opening is inclined so that the opening area increases toward the skin contact surface side. The

  The invention according to claim 4 defines the cross-sectional shape of the opening, and the side surface of the opening is inclined so as to increase the opening area toward the skin contact surface side. As a result, when receiving a compressive force from the outer side in the width direction toward the inner side at the time of wearing, the absorbent body for the base material in the vicinity of the opening easily enters the lower side of the absorbent body for middle and high, and the skin contact surface of the absorbent body for middle and high The movement toward the side is performed smoothly.

  As the present invention according to claim 5, a body fluid diffusive sheet is disposed on the skin contact surface side of the base material absorbent body and in the range from the opening or the vicinity thereof to the rear side of the absorbent article. An absorbent article according to any one of claims 1 to 4 is provided.

  In the invention according to claim 5, the body fluid diffusive sheet is disposed on the skin contact surface side of the absorbent body for the base material and in the range of the rear side of the absorbent article from the opening or the vicinity thereof. Thereby, the diffusion to the back of the body fluid absorbed by the middle-high absorber is promoted, and the body fluid absorption effect in the middle-high absorber can be prevented from deteriorating.

  As described above in detail, according to the present invention, it is possible to provide an absorbent article that does not deteriorate the function of the middle and high parts that fits the body and prevents leakage at the time of wearing, and that can be made compact in an individual packaging state. Become.

1 is a plan view of a sanitary napkin 1 according to the present invention. It is the II-II arrow directional view. It is the III-III arrow directional view of FIG. FIG. 4 is a cross-sectional view of the absorber 4. (A), (B) is sectional drawing of the absorber 4 which shows the deformation | transformation process at the time of mounting | wearing. 3 is a plan view of a base material absorbent body 20 showing a planar shape of an opening 22. FIG. Another embodiment (part 1) is shown, (A) is a plan view of the absorber 4, and (B) is a cross-sectional view. Another embodiment (part 2) is shown, (A) is a plan view of the absorber 4 and (B) is a cross-sectional view. It is a top view of the sanitary napkin 1 which shows another example of a form (the 3). It is sectional drawing of the absorber 4 which shows another example (the 4).

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Basic structure of sanitary napkin 1]
1 to 3, the sanitary napkin 1 according to the present invention has a liquid-impervious back sheet 2 made of a polyethylene sheet and the like, and a liquid-permeable surface that allows permeation of blood or vaginal discharge quickly. A sheet 3, an absorbent body 4 made of cotton-like pulp or synthetic pulp interposed between the two sheets 2, 3, a substantially side edge of the absorbent body 4 as a standing base end, and at least a body fluid discharge section A pair of left and right three-dimensional gathers BS projecting to the front side in a predetermined section in the front-rear direction, three-dimensional gather forming nonwoven fabrics 6 and 6 forming BS, and predetermined positions of the three-dimensional gather forming nonwoven fabrics 6 and 6 From the side nonwoven fabrics 7 and 7 extending to the side edges of the sanitary napkin 1 respectively, and in the periphery of the absorbent body 4, the liquid-impervious back sheet 2 and the upper and lower edges thereof Liquid permeability The liquid-impervious back sheet, wherein an outer edge portion with the face sheet 3 is bonded by an adhesive such as hot melt or an adhesive means such as heat seal, and both side edge portions extend laterally from the absorbent body 4. 2 and the side nonwoven fabric 7 are joined together by an adhesive such as hot melt or an adhesive means such as heat seal, and a wing shape protruding sideways by a laminated sheet portion of the liquid-impermeable back sheet 2 and the side nonwoven fabric 7. flaps W, with W is formed, which second wing-shaped flaps portion located buttocks side from W _B, is W _B are formed.

Hereinafter, the structure of the sanitary napkin 1 will be described in detail.
As the liquid-impervious back sheet 2, a sheet material having at least water shielding properties such as polyethylene is used, but in recent years, a material having moisture permeability tends to be used from the viewpoint of preventing stuffiness. The water- and moisture-permeable sheet material is a microporous material obtained by melting and kneading an inorganic filler in an olefin-based resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. A sheet is preferably used. One or a plurality of adhesive layers (not shown) are formed on the non-use surface side (outer surface) of the liquid-impervious back sheet 2 of the main body portion where the absorbent body 4 is interposed, and the body portion is physiological when worn on the body. The napkin 1 for use is fixed to the underwear. As said liquid-impermeable back sheet 2, you may use the polylamination nonwoven fabric which laminated | stacked the plastic film and the nonwoven fabric.

  Next, as the liquid-permeable surface sheet 3, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. As the material fibers constituting the nonwoven fabric, in addition to olefins such as polyethylene or polypropylene, polyesters, polyamides, and other synthetic fibers, regenerated fibers such as rayon and cupra, and natural fibers such as cotton can be used. A nonwoven fabric obtained by an appropriate processing method such as a method, a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of being bulky and soft. When a large number of pores are formed in the liquid-permeable surface sheet 3, menstrual blood, venom, etc. (hereinafter collectively referred to as body fluids) are quickly absorbed, and are excellent in dry touch properties. It will be a thing.

On the other hand, the width dimension of the liquid-permeable surface sheet 3 is slightly longer than the width of the absorbent body 4 as shown in the cross-sectional view of FIG. The three-dimensional gather BS is for the purpose of preventing the penetration of three-dimensional gather forming nonwoven fabric 6, which is different from the liquid-permeable surface sheet 3, specifically, menstrual blood or the like, or enhancing the feeling of touch. Depending on the case, it is configured using a non-woven fabric material subjected to appropriate water repellent treatment or hydrophilic treatment. The body gather forming nonwoven fabric 6 may be made of natural fibers, synthetic fibers, regenerated fibers, or the like and formed by an appropriate processing method. In order to prevent this, it is preferable to use a non-woven fabric with reduced basis weight and air permeability. Specifically, it is desirable to use a nonwoven fabric prepared with a basis weight of 13 to 23 g / m ² , and silicon-based, paraffin-based, alkylchromic chloride-based water repellents, etc. to reliably prevent the passage of body fluids. A water repellent nonwoven fabric coated with is preferably used. Note that the three-dimensional gather BS may be formed without the three-dimensional gather forming nonwoven fabric 6 being disposed, and the side nonwoven fabric 7 being continuously arranged inside.

The side nonwoven fabric 7 can be made of the same material as the nonwoven fabric 6 for forming a three-dimensional gather. As shown in FIG. Adhering with an adhesive such as hot melt over a range slightly beyond the outer edge of the liquid-impervious back sheet 2, the body sheet is almost completely separated by the laminated sheet portion of the side nonwoven fabric 7 and the liquid-impervious back sheet 2. a pair of left and right wing flaps W to the absorbent body side portion position corresponding to the discharge unit, to form a W, a second wing-shaped flaps W _B now to the buttocks side _position, to form a W _B (see FIG. 1). These wing-shaped flaps W, W and second wing-shaped flaps W _B, each comprise a pressure-sensitive adhesive layer on the outer surface side of the W _B (liquid-impermeable back sheet 2 side) (not shown), when worn against shorts, the wing-shaped flaps W, folded on the opposite side by fold line RL position W, as well as fastened is wound around the crotch portion of the shorts, for fastening the second wing-shaped flaps W _B, the W _B to the inner surface of shorts It is like that.

[About absorber 4]
In the sanitary napkin 1, as shown in FIGS. 1 and 4, the absorbent body 4 is disposed from the front side to the rear side of the sanitary napkin 1 and corresponds to the blood outlet H of the wearer. The base material absorbent body 20 having an opening 22 in the middle and the medium-high absorbent body 21 fitted in the opening 22 and formed at substantially the same height as the base material absorbent body 20 in the individually packaged state. Has been.

  As the base material absorbent body 20, any material that can absorb and retain body fluids may be used, but pulp fiber mixed with a water-absorbing polymer powder is preferably used from the viewpoint of absorption function and cost. The manufacturing method of the said absorber 20 for base materials can be made into an air through absorber and an airlaid absorber. In addition, chemical fibers may be mixed with tow fibers (fiber bundles) or piled pulp. Examples of the tow fiber include polysaccharides or derivatives thereof (cellulose, cellulose ester, chitin, chitosan, etc.), synthetic polymers (polyethylene, polypropylene, polyamide, polyester, polylactamamide, polyvinyl acetate, etc.). In particular, cellulose esters and cellulose are preferable. As the chemical fiber, for example, a polyolefin such as polyethylene or polypropylene, a polyester such as polyethylene terephthalate or polybutylene terephthalate, a polyamide such as nylon, and a synthetic fiber such as a copolymer thereof can be used. Two types may be mixed. In addition, a composite fiber such as a core-sheath fiber, a side-by-side fiber, or a split fiber having a fiber having a high melting point as a core and a fiber having a low melting point as a sheath can also be used. Examples of the pulp fiber include chemical fibers obtained from wood, cellulose fibers such as molten pulp, and artificial cellulose fibers such as rayon and acetate. Softwood pulp having a longer fiber length than hardwood pulp functions and It is preferably used in terms of price.

  As the middle / high-absorbent body 21, the bodily fluid discharged to the upper surface of the liquid-permeable surface sheet 3 is functionally absorbed rapidly, but the absorbed bodily fluid penetrates into the base material absorbent body 20 without being retained inside. In order to improve the permeability, a mixture of chemical fibers in pulp fibers, an air-through absorber, an airlaid absorber, or a tow fiber is preferably used. By mixing a chemical fiber with the middle-high absorbent 21, the bulk can be maintained and the cushioning property can be maintained without being deflated even when the body fluid is absorbed. In order to increase the bulkiness and improve the fit to the body, it is preferable that the middle-high absorber 21 is mixed with polyester fibers such as tow fibers (fiber bundles), polyethylene terephthalate, and polybutylene terephthalate.

  In addition, the said absorber 20 for base materials does not require that it contains a chemical fiber, It can be made into the mixture of a pulp fiber independent or a pulp fiber and a highly water absorbing resin. The base material absorbent body 20 is not important for permeability, and it is desirable to retain the body fluid that has permeated from the medium / high-weight absorbent body 21 so that it does not bleed out, so that it does not contain chemical fibers. It is rather preferable.

  The absorbent body 20 for base material and the absorbent body 21 for medium and high are respectively surrounded by encapsulating sheets 23 and 24 for shape retention and diffusibility improvement. As the encapsulating sheets 23 and 24, crepe paper, hydrophilic nonwoven fabric, or the like can be used. As shown in FIG. 3, the encapsulating sheet 24 of the middle-high absorber 21 is formed to be longer than the length of the opening 22 in the napkin longitudinal direction, and the portion extending in the longitudinal direction from the opening 22 is the absorbent body for base material. It is preferable to join to the 20 side. In the example shown in FIGS. 2 and 3, the encapsulating sheet 23 surrounding the base absorbent body 20 is cut off at the opening 22 and the edges thereof are joined to each other.

  The base material absorber 20 and the medium-high absorber 21 respectively surrounded by the encapsulating sheets 23 and 24 are adhesives such as hot melt applied along the longitudinal direction at the center in the width direction of the sanitary napkin 1. Are joined by.

  As shown in FIG. 5, when the absorber 4 receives a compressive force F from the outer side in the width direction toward the inner side during mounting, the interval between the side walls 22 a and 22 a in the opening 22 is reduced. The absorbent body for base material 20 on both sides of the opening 22 enters the lower side of the absorbent body for middle / higher 21 so that the absorbent body for middle / higher 21 is pushed away toward the skin contact surface side. It is comprised so that it can protrude toward the side (liquid-permeable surface sheet 3 side).

  As described above, in the sanitary napkin 1, in the individual packaging state, the middle and high portions of the high absorbent body are not formed on the use surface side, and the opening 22 of the absorbent body 20 for base material is received by receiving a predetermined compressive force F at the time of wearing. Since the middle-high absorbent body 21 fitted to the skin moves to the skin contact surface side to form the middle-high part, even if the sanitary napkin 1 is folded in the longitudinal direction in the individual packaging state, The fold wrinkles do not become tight, and therefore, the problem of lowering the function of the middle and high parts such as the rise of the middle and high parts being restricted and the fitting performance being lowered and leakage may be prevented. In addition, since the middle and high portions are not formed in the individual packaging state, the individual packaging becomes compact and the portability is excellent.

  Furthermore, in the sanitary napkin 1, at least both side walls 22 a in the width direction in the opening 22, which serve as sliding surfaces between the base material absorbent body 20 and the medium-high absorbent body 21 when receiving the compressive force F, It is preferable that a low friction sheet 25 for reducing the frictional resistance is disposed on each of the side surfaces 21a and 21a of 22a and / or the middle / high absorber 21. By disposing this low friction sheet 25, when receiving a compressive force F directed from the outside in the width direction toward the inside during mounting, the base material absorbent body 20 in the vicinity of the opening 22 is smoothly placed below the middle / high absorbent body 21. Therefore, a series of operations in which the mid-high absorber 21 moves toward the skin contact surface side is smoothly performed.

  As shown in FIG. 1, the low-friction sheet 25 disposed on the absorbent body 20 for the base material has both side walls 22 a and 22 a in the width direction in the opening 22 with respect to the width direction of the sanitary napkin 1. It is preferable to extend to the skin contact surface side of the absorbent body 20 for the base material from the opening 22 to the outside of the opening 22. In addition, as shown in FIG. 1, when the encapsulating sheet 23 surrounding the middle / high absorber 21 is disposed extending in the napkin longitudinal direction from the opening 22, the low friction sheet 25 is respectively extended by this extension. It is preferable to arrange also in the existing part.

  As the low friction sheet 25, a laminated nonwoven fabric or a film having a low frictional resistance can be used. The friction can be further reduced by applying a lubricant to the laminated nonwoven fabric or film. Examples of the lubricant include silicon resin, tetrafluoroethylene resin, trifluorochloroethylene resin, fluororesin represented by hexafluoroethylenepropylene resin, or mineral wax such as paraffin wax, synthesis of polyethylene wax, etc. Wax, animal or vegetable waxes can be preferably used.

  As another aspect, when the encapsulating sheet 23 of the base material absorbent body 20 and the encapsulating sheet 24 of the medium-high absorber 21 are made of non-woven fabric, at least the widthwise side walls 22a and 22a in the opening 22 are provided. Further, it is possible to impart slipperiness by subjecting the side surface portions 21a, 21a of the middle / high absorber 21 to low friction processing. The low-friction processing is performed by a method of pressing down the non-woven fabric surface so that fibers that fluff on the non-woven fabric surface lie on the non-woven fabric surface. Examples of the method of applying pressure to the nonwoven fabric surface include a method of sandwiching the nonwoven fabric between rollers and applying pressure from both the front and back surfaces. Moreover, it can also carry out by pinching a nonwoven fabric on two surfaces, such as a board. Further, heat may be applied during these pressurizations. By this low friction processing, the surface of the nonwoven fabric is smoothed with fuzzing and the friction coefficient is reduced. Note that the low friction processing may be a method of cutting and smoothing fuzzy fibers. As the friction resistance of the nonwoven fabric surface by the low friction processing, MD (Machine Direction) is preferably 0.01 to 0.50 and CD (Cross Direction) is preferably 0.01 to 0.70 in the mean deviation (MMD value) of the friction coefficient. .

  On the other hand, it is preferable to dispose a hydrophilic sheet 26 below the base material absorber 20 and the opening 22. As the hydrophilic sheet 26, a bulky nonwoven fabric such as air-through, or a mixture of chemical fibers in pulp fibers to improve the diffusibility of body fluids is preferably used. The hydrophilic sheet 26 can be mixed with tow fibers (fiber bundles), polyester fibers such as polyethylene terephthalate and polybutylene terephthalate, or can be composed only of tow fibers. Examples of the tow fiber include polysaccharides or derivatives thereof (cellulose, cellulose ester, chitin, chitosan, etc.), synthetic polymers (polyethylene, polypropylene, polyamide, polyester, polylactamamide, polyvinyl acetate, etc.). In particular, cellulose esters and cellulose are preferable.

  As the chemical fiber, for example, a polyolefin such as polyethylene or polypropylene, a polyester such as polyethylene terephthalate or polybutylene terephthalate, a polyamide such as nylon, and a synthetic fiber such as a copolymer thereof can be used. Two types may be mixed. In addition, a composite fiber such as a core-sheath fiber, a side-by-side fiber, or a split fiber having a fiber having a high melting point as a core and a fiber having a low melting point as a sheath can also be used. In the case of a hydrophobic fiber, it is desirable to use a chemical fiber that has been surface-treated with a hydrophilizing agent so as to have affinity for body fluids.

  The hydrophilic sheet 26 is bonded to the middle / high absorber 21 side in the opening 22 of the base absorber 20. For this reason, since the middle-high absorbent 21 moves toward the skin contact surface side and the hydrophilic sheet 26 is pulled up at the time of wearing, the body fluid absorbed by the middle-high absorbent 21 through the hydrophilic sheet 26 is based. It becomes easy to transfer to the absorber 20 for materials.

  As shown in FIG. 6, the opening 22 is preferably formed so that the opening width gradually decreases toward both ends in the longitudinal direction of the sanitary napkin 1 in plan view of the sanitary napkin 1. Thereby, when the compression force F which goes to an inner side from the width direction outer side is received at the time of mounting | wearing, between both the side walls of the opening 22 becomes easy to narrow uniformly from the front side to the rear side. As shown in FIG. 6, the specific planar shape is (A) a hexagonal shape oriented so as to have vertices at both ends in the longitudinal direction of the sanitary napkin 1, and (B) in the longitudinal direction of the sanitary napkin 1. A long oval shape, (C) a long rhombus shape in the longitudinal direction of the sanitary napkin 1, (C) a shape in which both side walls of the hexagonal shape are convex inward (illustrated example) or convexly curved or bent outward. be able to.

  Further, as shown in FIGS. 2 and 3, the cross-sectional shape of the opening 22 is preferably formed such that the side surface is inclined so that the opening area increases toward the skin contact surface side. Thereby, since the side wall of the opening 22 is formed in a wedge shape with the lower side (non-skin contact surface side) protruding, when the compression force F is applied from the outer side in the width direction to the inner side during wearing, the vicinity of the opening 22 This makes it easier for the base material absorbent body 20 to enter the lower side of the mid-high absorbent body 21, and the movement of the mid-high absorbent body 21 toward the skin contact surface side is performed smoothly.

  As shown in FIG. 1, the opening 22 has a longitudinal length L of the sanitary napkin 1 of 90 mm or more, and a width direction length B of 25% with respect to the width direction length M of the base absorbent body 20. As mentioned above, it is desirable that it is 50% or less (0.25M <= B <= 0.5M). If the length L in the longitudinal direction is smaller than 90 mm, the blood outlet cannot be covered by the medium-high absorber 21, and if the length B in the width direction is smaller than 0.25M, a sufficient width cannot be secured as the medium-high absorber 21. If B is larger than 0.5M, the base-material absorber 20 will not be able to enter the lower central portion of the mid-high absorber 21 when it is compressively deformed during mounting.

  The middle / high absorber 21 is formed so that at least a part thereof fits into the opening 22. That is, even if the middle-high absorber 21 is formed to be smaller than the size of the opening 22 and all of the absorber 21 can be fitted into the opening 22, the width of the opening 22 in the napkin width direction length B or less. And having a length longer than the length L of the opening 22 in the napkin longitudinal direction, a part of which can be fitted into the opening 22. As the middle-high absorber 21 in which all of the former can be fitted into the opening 22, a cut piece obtained by cutting off the portion of the opening 22 from one base material absorber 20 in which the opening 22 is not formed. Can be used.

  For the middle-high absorbent 21, the body fluid diffusive sheet is located on the skin contact surface side of the base absorbent 20 and from the opening 22 or the vicinity thereof to the rear side of the sanitary napkin 1. 27 can be provided.

  For example, in FIG. 7, a belt-like body fluid diffusive sheet 27 is disposed in a range from the lower side of the middle-high absorber 21 to the rear side of the opening 22. The portion extending rearward from the opening 22 is preferably provided with a gap along the longitudinal direction at the center in the width direction of the sanitary napkin 1. By providing this gap, it is possible to prevent the central portion in the width direction of the rear portion from being hindered from being deformed to the skin surface side.

  Moreover, in FIG. 8, it is between the envelope sheet | seat 23 and the base material absorber 20 which surround the absorber 21 for middle and high, Comprising: From the vicinity of the rear-end part of the opening 22 to the range of the back side of the sanitary napkin 1 On the other hand, a body fluid diffusive sheet 27 is provided.

  By disposing the body fluid diffusive sheet 27, diffusion of the body fluid absorbed by the middle / high absorbent body 21 is promoted to the rear, and a decrease in the effect of body fluid absorption due to the body fluid absorption limit of the middle / high body absorbent 21 is prevented. it can. As the bodily fluid diffusive sheet 27, a sheet made of tow fibers having bodily fluid absorbability and excellent diffusibility can be suitably used.

  Next, the manufacturing procedure of the absorbent body 4 will be described. After the base material absorbent body 20 and the medium / high-sized absorbent body 21 in which the opening 22 is formed are surrounded by the encapsulating sheets 23 and 24, respectively, as necessary. Then, the outer surface of the encapsulating sheet 23 covering the skin contact surface side of the absorbent body 20 for the base material, and at least both side wall portions in the opening 22 are subjected to a low friction treatment, and if necessary, absorption for medium and high A friction reducing process is performed on both side surfaces of the encapsulating sheet 24 surrounding the body 21. Thereafter, an adhesive such as a hot melt in the form of a line or a strip along the longitudinal direction at least in the widthwise central portion of the opening 22 on the outer surface of the encapsulating sheet 23 covering the skin contact surface side of the absorbent body 20 for base material And the medium / high absorber 21 is joined from the upper surface thereof, and the medium / high absorber 21 is fitted into the opening 22 to manufacture the absorber 4.

[Other examples]
(1) In the above-described embodiment, the enveloping sheet 24 surrounding the middle-high absorber 21 is provided to extend in the napkin longitudinal direction from the opening 22, but as shown in FIG. 21 and the encapsulating sheet 24 may be formed in substantially the same shape as the opening 22, and the medium / high absorber 21 and the encapsulating sheet 24 may be fitted into the opening 22 in an individually packaged state.

(2) In the above embodiment, the hydrophilic sheet 26 is disposed on the outer surface side of the encapsulating sheet 23 surrounding the base absorbent body 20, but as shown in FIG. You may arrange | position between the absorber 20 and the covering sheet | seat 23. FIG. In this case, the base absorbent body 20 is surrounded by the encapsulating sheet 23 together with the hydrophilic sheet 26, and the encapsulating sheet 23 on the skin contact surface side and the hydrophilic sheet 26 are joined at the opening 22.

  DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Impervious back sheet, 3 ... Liquid permeable surface sheet, 4 ... Absorber, 6 ... Three-dimensional gather forming nonwoven fabric, 7 ... Side nonwoven fabric, 20 ... Substrate absorber, 21 ... Medium-high absorber, 22 ... Opening, 23.24 ... Encapsulated sheet, 25 ... Low friction sheet, 26 ... Hydrophilic sheet

Claims (5)

An absorbent article in which an absorber is interposed between a back sheet and a liquid-permeable top sheet,
The absorbent body is disposed from the front side to the rear side of the absorbent article, and has a base material absorbent body having an opening corresponding to the blood drainage port of the wearer. And composed of a medium-high absorber formed at a height substantially equal to the base material absorber,
When receiving a compressive force directed from the outside in the width direction to the inside when installed, the gap between the side walls of the opening is narrowed, and the absorbent body for the base material on both sides of the opening enters the lower side of the absorbent body for middle and high By the above, the absorber for middle and high can protrude toward the skin contact surface side,
Wherein the lower side of the base material for the absorbent body and the opening is disposed hydrophilic sheet made of nonwoven fabric, the hydrophilic sheet, the absorbent body side for the medium and high in the longitudinal direction in only the central portion in the width direction of the opening The absorbent article is constructed such that the hydrophilic sheet is pulled up together with the mid-high absorber by moving the mid-high absorber to the skin contact surface side when being joined. .   Friction on at least both side wall portions in the opening and / or both side surface portions of the medium-high absorber, which are sliding surfaces between the base material absorber and the medium-high absorber when receiving the compressive force. The absorptive article according to claim 1 in which low-friction processing which reduces resistance is performed.   The said opening is an absorbent article in any one of Claims 1-2 currently formed so that an opening width may become small gradually toward the longitudinal direction both ends side of the said absorbent article.   The absorbent article according to any one of claims 1 to 3, wherein a side surface of the opening is inclined so as to increase an opening area toward a skin contact surface side.   5. The body fluid diffusive sheet is disposed on the skin contact surface side of the absorbent body for the base material and in the range from the opening or the vicinity thereof to the rear side of the absorbent article. Absorbent article as described in 1.

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