JP5681446B2 - Absorbent articles - Google Patents

Description

  The present invention relates to absorbent articles such as sanitary napkins, panty liners, and incontinence pads for absorbing menstrual blood and vaginal discharge, and more particularly to absorbent articles that have improved adhesion to skin when worn.

  Conventionally, as absorbent articles such as panty liners, sanitary napkins, cage sheets, incontinence pads, toiletries, etc., liquid-impervious back sheets such as polyethylene sheets or polyethylene sheet-laminated nonwoven fabrics, nonwoven fabrics or liquid-permeable plastic sheets, etc. There is known one in which an absorbent body made of cotton-like pulp or the like is interposed between the liquid-permeable surface sheet.

  Numerous improvements have been made on this type of absorbent article, and various means for preventing body fluid leakage have been taken. In particular, in a night napkin or the like, there is a transmission leak due to a gap formed between a valley of a buttock or a blood drainage port and the napkin surface as one of the causes of leakage. For this reason, what developed the thing which made the napkin center part protrude to the skin surface side along a longitudinal direction, and was made to contact | adhere to skin is developed.

  For example, in Patent Document 1 below, at least a rear central portion of the absorbent article has an absorbent middle portion that extends in the longitudinal direction of the absorbent article and protrudes toward the skin contact surface side, and the absorbent body. An absorbent article is disclosed in which intermittent concave grooves are formed along the longitudinal direction of the absorbent article on the non-skin contact surface side of the absorbent body corresponding to the middle and high portions. In such an absorbent article, in a mounted state, a large number of transverse axes that pass through portions (unprocessed portions) between intermittently formed concave grooves are deformed so as to be bent as flexible shafts, In order to fit the body so as to follow the roundness, and to deform so as to further raise the middle part of the absorbent body by a flexible shaft (longitudinal direction flexible shaft) with the formation row of the concave grooves as an axis, The absorber middle-high portion can be brought into close contact with the recessed portion.

  Further, in Patent Document 2 below, a pair of wing portions are formed from both end portions of an elastic stretchable sheet that crosses the absorbent main body and is fixed to the absorbent main body in an extended state. The fixing portions for the absorbent main body are respectively formed at positions on the inner side in the width direction from both side edges of the absorbent body at least on both sides in the longitudinal direction of the absorbent main body, and the absorbent main body includes two fixing portions. In the meantime, an absorbent article that is contracted in the width direction due to contraction of the elastic stretchable sheet is disclosed. In such an absorbent article, the absorbent main body actively contracts in conjunction with the elastic stretch sheet, and has a pre-planned contracted shape. It can be prevented.

JP 2006-263205 A JP 2002-369837 A

  However, in the absorbent article described in Patent Document 1, when a pressure-sensitive adhesive layer is formed on the non-use side (outer surface) of the liquid-impervious back sheet for adhesion and fixation to the underwear when worn, Depending on the position at which the absorber is provided, there is a risk that deformation of the absorbent body that rises is suppressed. For example, when an adhesive layer is provided along the longitudinal direction in the center of the absorbent article in the width direction, it is easily affected by the underwear twist due to leg pressure or the sleeping phase at bedtime. This also causes twisting and decreases the degree of adhesion with the skin. In addition, when the absorbent article is bonded and fixed to the undergarment, it is difficult for the absorbent body to be deformed so as to be raised, which causes a decrease in the degree of adhesion with the skin.

  On the other hand, when the absorbent main body between the fixing parts is raised on the surface side by contraction of the elastic stretchable sheet as in the absorbent article described in Patent Document 2, it is disposed on the outer surface side of the elastic stretchable sheet. Since the back sheet also shrinks, the adhesion between the pressure-sensitive adhesive layer provided on the back sheet and the underwear peels off and the effect of preventing misalignment decreases, and the degree of adhesion to the skin decreases due to the shift of the absorbent article. There is a fear.

  Accordingly, the main problem of the present invention is to provide an absorbent article that enhances the degree of adhesion with the skin by promoting the deformation that causes the central region of the absorbent body to rise, and that prevents the degree of adhesion from being lowered due to shorts in the shorts. There is to do.

In order to solve the above-mentioned problem, as the present invention according to claim 1, an absorbent body is interposed between the liquid-permeable top sheet and the back sheet, and a non-slip adhesive layer on the non-skin contact surface side of the back sheet. In the absorbent article formed with
A pair of left and right front grooves formed on the non-skin contact surface side of the absorbent body from the intersection of the center in the width direction behind the blood drainage port toward both sides diagonally forward, and the absorbent article from the intersection Y-shaped perineum embossing groove comprising a rear groove formed toward the rear along the longitudinal direction of
The center region including the rear groove is not formed with the anti-slipping adhesive layer, and the anti-slipping adhesive layer is formed on both sides along the longitudinal direction of the absorbent article. Articles are provided.

  In the first aspect of the present invention, since the embossed groove is formed along the longitudinal direction in the widthwise central portion of the absorbent article on the non-skin contact surface side of the absorbent body, Thinner than the part and reduced in rigidity (secondary moment of cross section), when the pressure of the legs from both sides is applied, this embossed groove is used as a flexible shaft to promote the deformation that causes the absorber to rise Therefore, the degree of adhesion with the skin can be increased.

Specifically, on the non-skin contact surface side of the absorbent body, a pair of left and right front grooves formed from the intersection of the widthwise center behind the blood drainage port toward both sides diagonally forward, and the intersection Since the Y-shaped embossing groove for the perineal area consisting of a rear groove formed rearward along the longitudinal direction of the absorbent article is formed, when leg pressure from both sides acts on the absorbent body Then, a triangular pyramid-shaped raised portion having the intersection point as a vertex is formed with the perineum embossed groove as a flexible axis.

In addition, the center region of the absorber is not formed in the center region including the rear groove, and the center layer of the absorbent body is formed on both sides thereof along the longitudinal direction of the absorbent article. This prevents the area where the deformation of the area from rising is hindered by the anti-displacement adhesive layer, and even if the shorts are bent due to leg pressure from both sides or the sleeping phase at bedtime, the central area where the area rises Can be kept in close contact with the skin without being affected by twist. Further, since the anti-slipping adhesive layer is formed on both sides of the central region, this portion serves as a base point of the raised portion of the absorbent body so that the deformation of the raised central region of the absorbent body is promoted. At the same time, the adhesive can be fixed to the undergarment.

As a second aspect of the present invention according to the present invention, in the crotch portion including the blood drainage port portion on the front side from the formation position of the embossing groove for the perineum portion, the absorption side is the non-skin contact surface side of the absorber. An embossed groove for the crotch part is formed along the longitudinal direction at the central part in the width direction of the absorbent article, and the non-skin contact surface side of the absorbent body is located behind the formation position of the embossed groove for the perineum part. An intermittent embossing groove for the buttock is formed along the longitudinal direction at the center in the width direction of the absorbent article.
2. The absorbent article according to claim 1, wherein the anti-slip adhesive layer is not formed in a central region including the crotch embossed groove and the buttock embossed groove.

The invention according to claim 2 further absorbs the crotch portion including the blood drainage opening on the non-skin contact surface side of the absorbent body, on the front side from the formation position of the embossing groove for the perineum. The crotch embossed groove formed along the longitudinal direction in the widthwise central portion of the article and the formation side of the perineum embossed groove on the rear side, on the non-skin contact surface side of the absorbent body, the widthwise central portion of the absorbent article in the longitudinal direction is obtained by forming the buttocks the embossing groove formed intermittently. Moreover, the said slip prevention adhesive layer is not formed in the center area | region containing the said embossed groove for crotch parts, and the embossed groove for hips.

As the present invention according to claim 3, the distal end portion of the front groove of the perineum embossing grooves, absorbent article according to claim 1, 2 or which is formed in a region overlapping with the displacement preventing pressure-sensitive adhesive layer Is provided.

In the invention of claim 3 , the tip of the front groove of the Y-shaped perineum embossing groove is formed in a region overlapping the anti-slipping adhesive layer, so that the tip of the Y-shaped embossing groove is It is stably fixed to the underwear side, and the absorber tends to be deformed so as to rise in a triangular pyramid shape along the perineum embossing groove.

As the present invention according to claim 4 , at least on both sides of the perineum embossing groove, the crotch embossing groove, and the buttock embossing groove , the substantially longitudinal direction of the absorbent article from the skin contact surface side of the absorbent article. The absorbent article according to claim 2 , wherein a pair of left and right fit embosses are formed along a direction, and the fit embosses are formed in a region overlapping with the anti-slip adhesive layer.

The invention according to claim 4 relates to the relative positional relationship between the fit emboss formed on the skin contact surface side of the absorbent article and the anti-slip adhesive layer formed on the non-skin contact surface side of the back sheet. The fit embossing includes at least the perineal part embossing groove, the crotch part embossing groove, and the buttock embossing groove on both sides of the absorbent article from the skin contact surface side in the substantially longitudinal direction. A pair of left and right are formed along the line, and the fit emboss is formed in a region overlapping the misalignment preventing adhesive layer. Thereby, it becomes easy to generate | occur | produce a deformation | transformation which the center area | region of an absorber protrudes to the skin contact surface side from the fitting embossing formed in the part adhesively fixed to the underwear by the slip prevention adhesive layer.

As the present invention according to claim 5 , a slip-preventing adhesive layer is formed on the front side and the rear side of the central region, where the perineum embossing groove, the crotch embossing groove, and the buttock embossing groove are not formed. An absorbent article according to claim 2 is provided.

In the invention according to claim 5 , the front side and the rear side of the central region where the anti-slipping adhesive layer is not formed, the region where the perineum embossing groove, the crotch embossing groove, and the buttock embossing groove are not formed. By forming the anti-displacement pressure-sensitive adhesive layer, it is possible to prevent the absorbent article from being turned up and down and to prevent the underwear twist from extending in the front-rear direction to the central region.

  As described above in detail, according to the present invention, the absorbent article has an improved degree of adhesion with the skin by promoting the deformation that causes the central region of the absorbent body to rise, and has prevented the deterioration of the degree of adhesion due to shorts of the shorts or the like. Will be able to provide.

It is an expanded view of the sanitary napkin 1 which concerns on this invention. FIG. It is the III-III arrow directional view of FIG. It is the IV-IV arrow directional view of FIG. It is an expanded sectional view showing sanitary napkin 1 of a wearing state. It is a bottom view of a human body which shows a crotch part structure. FIG. 6 is a plan view of the absorber defect portion 22. It is the top view and sectional drawing of the absorber defect | deletion part 22 which concern on another form. It is a reverse view of the sanitary napkin 1 which concerns on another form. It is a reverse view of the sanitary napkin 1 which concerns on another form.

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

[Basic structure of sanitary napkin 1]
1 to 4, 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 menstrual blood or vaginal discharge quickly. Sheet 3, absorbent bodies 4, 6 made of cotton-like pulp or synthetic pulp interposed between both sheets 2, 3, and the absorbent body 4 for maintaining the shape and improving the diffusibility of the absorbent body 4. The left and right sides are provided so as to protrude from the front surface side in a predetermined section in the front-rear direction so as to include at least the body fluid discharge portion with the substantially side edge portion of the absorbent body 4 as an upright base end. It is mainly composed of a pair of three-dimensional gathers BS and BS, and around the absorbent body 4, the outer edge portions of the liquid-impervious back sheet 2 and the liquid-permeable surface sheet 3 are formed at the upper and lower end edges. Adhesives such as hot melt and heat The impervious back sheet 2 joined by joining means such as a seal and extending laterally from the absorbent body 4 at both side edges, and the side nonwoven fabric 7 forming the three-dimensional gather BS Are bonded by bonding means such as an adhesive such as hot melt or heat sealing, and wing-like flaps W and W projecting sideways are formed by the laminated sheet portion of the liquid-impermeable back sheet 2 and the side nonwoven fabric 7. together and 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-impermeable back sheet 2 so as to fix the sanitary napkin 1 to the underwear when worn on the body. It has become. 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.

  The absorbent body 4 is not particularly limited as long as it can absorb and retain bodily fluids. Usually, a fluffy pulp mixed with a water-absorbing polymer powder is preferably used from the viewpoint of the absorption function and cost. The absorbent body 4 is preferably surrounded by an encapsulating sheet 5 in order to maintain the shape. As the encapsulating sheet 5, crepe paper, hydrophilic nonwoven fabric, or the like can be used.

  Synthetic fibers may be mixed in the absorber 4 and / or the absorber middle-high portion 6 described later. As the synthetic fiber, for example, polyolefins such as polyethylene or polypropylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon, and copolymers thereof can be used. It may be a mixture. 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 synthetic fiber that has been surface-treated with a hydrophilizing agent so as to have an affinity for body fluids.

  On the use surface side of the absorbent body 4, there can be formed an absorbent mid-high section 6 that is elongated in the longitudinal direction of the napkin at the center in the width direction and extends in the longitudinal direction and rises to the skin contact surface side. As shown in FIG. 1, the absorbent body middle-high portion 6 includes a crotch portion 6 </ b> A that includes a blood drainage port H of the wearer and a portion corresponding to a perineum embossing groove 23 described later at the center in the width direction. And the rear part 6B which is continuous from the rear end of the crotch part 6A. The crotch portion 6A of the absorber middle-high portion 6 is desirably provided at a predetermined height in order to maintain the amount of absorption and adhesion to the blood drainage port, but the rear portion 6B is deformed by embossing described later. It is preferable to make it thinner or eliminated from the crotch portion 6A so as not to hinder it. The thickness of the absorber middle high portion 6 is 3-20 mm at the crotch portion 6A, preferably 5-15 mm, and 0-10 mm, preferably 0-3 mm at the rear portion 6B. Further, as shown in FIG. 4, the skin contact surface side of the rear part 6B is bulky so as not to make the wearer feel uneasy by thinning or eliminating the absorber middle high part 6 of the rear part 6B. A second sheet 6a can be provided. The second sheet 6a is preferably made of a material having a high cushioning property so as not to affect the deformation of the absorbers 4 and 6. In addition, the absorber middle high portion 6 is formed such that the rear portion 6B is narrower than the front portion 6A, and the width and / or thickness gradually decreases toward the rear at the boundary between the front portion 6A and the rear portion 6B. Is formed. The boundary range in which the width and / or thickness gradually decreases is such that the front start position is slightly behind the portion corresponding to the intersection C of the perineum embossing groove 23 described in detail later, and the rear end position is the rear stage. It is preferable to be slightly behind the portion corresponding to the rear end of the rear groove 25 of the perineum embossing groove 23 described in detail in FIG. Thereby, the fitting property of the boundary portion between the crotch portion 6A and the rear portion 6B is improved.

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 views of FIGS. The three-dimensional gather BS prevents the permeation of the menstrual blood or the like, or increases the feeling of touch, etc. Depending on the purpose, a nonwoven fabric material subjected to appropriate water repellent treatment or hydrophilic treatment is used. The side nonwoven fabric 7 can be made of natural fiber, synthetic fiber, regenerated fiber, or the like and formed by an appropriate processing method. Preferably, the side nonwoven fabric 7 eliminates the feeling of stickiness and prevents stuffiness. For this reason, 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.

As shown in FIGS. 3 and 4, the side nonwoven fabric 7 has an outer portion from the intermediate portion in the width direction from the inner position of the absorber 4 to slightly beyond the absorber side edge to the outer edge of the liquid-impermeable back sheet 2. A pair of left and right wings are bonded to the absorbent body side portion substantially corresponding to the body fluid discharge portion by the laminated sheet portion of the side nonwoven fabric 7 and the liquid-impervious back sheet 2. flaps W, to form a W, a second wing-shaped flaps W _B now to the buttocks side _position, to form a W _B.

As shown in FIG. 2, the non-skin contact surface of the main body part in which the absorbent body 4 is interposed between the liquid-permeable top sheet 3 and the liquid-impervious back sheet 2 is for fixing to the underwear. Are formed with an appropriate coating pattern. Moreover, the wing-shaped flaps W, with wing-fixing adhesive layer 8, 8 on the surface of the liquid-impermeable back sheet 2 side of W is formed, the second wing-shaped flaps W _B, and W _B not Wings prevention adhesive layers 9 and 9 are formed on the surface of the liquid-permeable back sheet 2 side. The wings-stopping adhesive layers 8 and 8 are configured to wrap the wing-shaped flaps W and W to the opposite side at the position of the fold line RL when being attached to the shorts, and wrap around the crotch portion of the shorts and fasten. Yes. In addition, these slip prevention adhesive layers 8-11 are covered with the peeling material which is not shown in figure.

  As the pressure-sensitive adhesive that forms the anti-displacement pressure-sensitive adhesive layers 8 to 11, for example, a styrenic polymer, a tackifier, or a plasticizer that is a main component is preferably used. Examples of the styrenic polymer include styrene-ethylene-butylene-styrene block copolymers, styrene-butylene-styrene block copolymers, and styrene-isobutylene-styrene copolymers. It may be used or two or more polymer blends. Among these, a styrene-ethylene-butylene-styrene block copolymer is preferable in terms of good thermal stability. As the tackifier and plasticizer, those that are solid at room temperature can be preferably used. Examples of the tackifier include C5 petroleum resins, C9 petroleum resins, dicyclopentadiene petroleum resins, and rosin petroleum resins. Polyterpene resin, terpene phenol resin, etc., and examples of the plasticizer include monomer plasticizers such as trifresil phosphate, dibutyl phthalate, dioctyl phthalate, and polymer plasticizers such as vinyl polymers and polyesters. It is done.

  On the other hand, while the inner side part of the said side nonwoven fabric 7 is folded back substantially double, the thread-like elastic elastic member by which the appropriate position of the both ends or the longitudinal direction was fixed to the height direction intermediate part inside this double sheet | seat Are provided, and three-dimensional gathers BS and BS standing on the surface side are formed. Specifically, as shown in FIG. 3 and FIG. 4, in the standing state, the side surface standing part 7 a that stands up from the side edge of the absorber 4 or the vicinity thereof, and the tip of the side surface standing part 7 a are continuously provided. A skin contact surface portion 7b having a predetermined width that is formed to be substantially horizontal or inclined to the center side with respect to the surface of the napkin 1, and the side surface standing portion 7a of the skin contact surface portion 7b It is located outside the outer side edge. Each of the side upright portion 7a and the skin contact surface portion 7b has one or a plurality of thread-like elastic elastic members 12... 13 in the illustrated example along the longitudinal direction of the sanitary napkin 1. It is arranged.

[Structure of emboss groove and anti-displacement adhesive layer, etc.]
Next, the embossed groove formed on the non-skin contact surface side of the absorbent body 4, the fit emboss formed on the skin contact surface side of the sanitary napkin 1, and the non-skin contact surface side of the back sheet 2 are formed. The structure of the anti-slipping adhesive layer will be described below.

1 to 4, the sanitary napkin 1 is embossed on the non-skin contact surface side of the absorbent body 4 and at the center in the width direction of the sanitary napkin 1 along the longitudinal direction. One or a plurality of embossed grooves E having at least a part thereof are formed, and a central region M including an embossed part formed along the longitudinal direction in the widthwise central portion of the sanitary napkin 1 among the embossed grooves E. Is not formed with the main body displacement preventing adhesive layer, and the main body displacement preventing adhesive layers 10 and 10 are formed along the longitudinal direction of the sanitary napkin 1 on both sides thereof. Further, in the illustrated example, the main body displacement preventing adhesive layers 11 are formed on the front side and the rear side of the central region M and in the region where the embossed groove E is not formed.

  By forming the embossed groove E from the non-skin contact surface side of the absorbent body 4, as shown in FIG. 5, the embossed groove E is thinner than the other parts, and rigidity (secondary moment of cross section) is obtained. Therefore, when the pressure of the legs acts from both sides, the embossed groove E is used as a flexible shaft, the deformation of the central portion of the absorbent body 4 is promoted, and the blood drainage port, perineum, and buttock It becomes possible to increase the degree of adhesion with the skin of the depressed part of the body such as the groove part of the body.

In the embossed groove E , the sanitary napkin 1 is not formed in the central region M including the embossed portion formed along the longitudinal direction at the center in the width direction of the sanitary napkin 1. Can prevent a situation in which the central region of the absorber is unlikely to rise due to the adhesive being fixed to the underwear, and even if the shorts are twisted due to leg pressure from both sides or the sleeping phase at bedtime, etc. The raised central region M can be kept in close contact with the skin without being affected by twisting. On the other hand, since the anti-displacement adhesive layers 10 and 10 are formed on both sides of the central region M, the both side portions serve as the base points of the raised portions of the absorbent body so that the central region M of the absorbent body is raised. Smooth deformation is promoted.

  In addition, since the main body displacement preventing adhesive layers 11 and 11 are formed in the front and rear regions of the central region M, the sanitary napkin 1 can be prevented from being turned up and down, and the underwear from the front and rear direction can be bent. It is possible to prevent progressing to M.

  The embossed groove E will be described in detail. The embossed groove E is a non-skin contact surface side of the absorbent body 4 at the crotch portion including the blood drainage port H and the widthwise central portion of the sanitary napkin 1. The embossed groove 26 for the crotch part formed along the longitudinal direction and the width of the sanitary napkin 1 on the non-skin contact surface side of the absorbent body 4 on the rear side separated from the embossed groove 26 for the crotch part Embossed grooves 20, 20 formed intermittently along the longitudinal direction at the center in the direction, and the intersection of the center in the width direction behind the blood outlet H on the non-skin contact surface side of the absorber 4 A Y-shape comprising a pair of left and right front grooves 24, 24 formed diagonally forward from C and a rear groove 25 formed from the intersection C toward the rear along the longitudinal direction of the sanitary napkin 1. The perineum embossing groove 23 is included.

  The crotch embossing groove 26 is formed to cause the absorber to be deformed in the crotch part so that the surface is brought into close contact with the blood outlet. The crotch embossed groove 26 makes the widthwise center portion of the absorbent body 4 easily rise to the surface side along the longitudinal direction with the crotch embossed groove 26 as a flexible shaft, and the surface of the sanitary napkin 1 It is possible to ensure close contact with the blood drainage port of the wearer.

  The buttock embossing groove 20 is formed in order to cause deformation of the absorber to rise in the buttock and to bring the surface into close contact with the valley of the buttock and the roundness in the front-rear direction of the buttock. The flange embossing groove 20 may be formed as a continuous groove, but intermittent embossing grooves 20 in which relatively short straight concave embossing and unembossed non-processed portions are alternately arranged. , 20 is preferable because it can follow the roundness in the front-rear direction of the buttocks. In addition, although the said embossed groove | channel 20 for heel parts is formed in two places back and forth in the example of illustration, it can also form three or more places.

In the central region M including the crotch embossing groove 26 and the buttock embossing groove 20, a slip prevention adhesive layer is not formed.

  In addition, it is preferable to form an absorber defect portion 22 in which the absorber 4 is lost at least between the rib embossing grooves 20, 20, that is, in an unprocessed portion of the rib embossing groove 20. In the illustrated example, in addition to between the buttock embossed grooves 20, 20, it is also provided between the perineum embossed groove 23 and the buttock embossed groove 20, which will be described in detail later. As described above, when the central portion in the width direction is raised using the formation row of the embossed grooves 20 and 20 for the buttock as a flexible shaft, and the raised portion is curved along the roundness in the front-rear direction of the buttock, The absorbent body defect portion 22 absorbs deformation in the compression direction and tension direction of the absorbent body 4 so that wrinkles in the width direction are less likely to occur on the skin contact surface side, and can be satisfactorily adhered to the back of the narrow valley of the heel portion. become.

  Thus, by forming the buttock embossing groove 20 and the absorber defect portion 22 on the non-skin contact surface side of the absorber 4, the rear portion of the central region M is likely to rise along the napkin longitudinal direction, and Since this raised part is easily curved along the roundness in the front-rear direction of the buttocks, the adhesion to the valleys of the buttocks is improved and the back leakage of body fluid can be prevented.

  Next, the embossing groove 23 for the perineum is formed to fit the surface of the sanitary napkin 1 to the shape of the body from the perineum behind the blood drainage port to the valley of the buttocks. By forming the embossing groove 23 for the perineum part, the embossing groove 23 for the perineum part is made thinner than the other part and the rigidity (second moment of section) is reduced, so that the pressure of the legs from both sides acts. In this case, a triangular pyramid-shaped raised portion having the intersection C as a vertex is formed with the perineum embossed groove 23 as a flexible axis. Among the triangular pyramidal ridges, the lines extending diagonally forward on both sides of the front grooves 24, 24 extend from the rear part of the blood drainage port H to the beginning part of the valley of the buttocks, as shown in FIG. It fits to the body lines La and La extending toward both front sides starting from the beginning of the valley of the buttocks formed in the perineum. Further, among the triangular pyramidal ridges, a line extending rearward by the rear groove 25 fits a line Lb between the beginning of the ridge valley to the rear ridge valley. For this reason, the triangular pyramidal ridge formed by the perineum embossing groove 23 fits very well to the shape of the body from the perineum behind the blood drainage port H to the valley of the buttocks, to the back of the body fluid It will be possible to prevent leakage.

In the central region M including the rear groove 25, the anti-slipping adhesive layer is not formed, and the anti-slipping adhesive layers 10, 10 are formed along the longitudinal direction of the napkin 1 on both sides thereof. The front end of the perineum embossing groove 23 is preferably formed in a region overlapping with the anti-displacement adhesive layers 10 and 10.

  The structure of the embossed groove E (the crotch embossed groove 26, the buttocks embossed groove 20 and the perineal embossed groove 23) will be described in more detail. As shown in FIG. 1 and the like, the sanitary napkin 1 has a central portion. When the absorber middle high part 6 that extends in the longitudinal direction of the napkin and protrudes toward the skin contact surface side is formed, the crotch part embossed groove 26 and the buttock embossed groove 20 absorb the corresponding part of the absorber middle high part 6. The perineal part embossing groove 23 is formed on the non-skin contact surface side of the absorbent body 4 corresponding to the middle and high part 6 of the absorber and the vicinity thereof.

  The depth of the embossed groove E (the crotch embossed groove 26, the buttocks embossed groove 20 and the perineal embossed groove 23) is 30 to 95%, preferably 50 to 90% with respect to the thickness of the absorber 4. It is desirable to form at a depth. When the depth of the embossed groove E is less than 30%, it is not possible to ensure the deformability in the longitudinal direction as well as the deformability in the transverse direction. When the depth of the embossed groove E exceeds 95%, the rigidity of the embossed groove E becomes too high, and the curve along the roundness in the front-rear direction of the body does not easily occur.

  The length per one embossed groove 20 for the buttocks is preferably 5 mm to 30 mm, and more preferably 10 mm to 20 mm. The length of the buttock embossing groove 20 may not be constant. In the illustrated example, the buttock embossing groove 20 on the rear side is longer than the front side.

  The absorbent missing portion 22 is formed within a range of 10 mm to 20 mm in the width direction of the sanitary napkin 1 and 5 mm to 15 mm in the longitudinal direction. As shown in FIG. (B) Absorber is lost in any shape such as a rhombus shape, (C), (D) a wedge shape, or a triangular shape. Moreover, although the cross-sectional shape is good also as the same shape in the thickness direction of an absorber, it is good also as a three-dimensional shape which changed the shape in the thickness direction of the absorber 4, as FIG. 8 shows.

  The angle α formed between the front grooves 24 and 24 of the perineum embossing groove 23 is such that the angle of the body lines La and La formed in the perineum of an adult woman is high at a rate of approximately 70 ° or more. In order to adapt to this line, it is preferably 70 ° or more and less than 180 °, more preferably 90 ° or more and less than 150 °. By setting the angle to 70 ° or more, when the leg pressure from both sides is applied, the rising effect of the absorbent body having the perineum embossed groove 23 as a flexible shaft is improved.

  The intersection C of the embossing groove 23 for the perineal area is at least the central part in the width direction of the sanitary napkin 1 in order to improve the fit to the perineal area from the vaginal opening to the vicinity of the anus on the rear side, and the blood drainage opening. It is set between 40 mm and 60 mm behind the sanitary napkin 1 from the center of H.

  The front groove 24 and the rear groove 25 are each formed with a length of 20 mm to 40 mm from the intersection C, and the lengths of the front groove 24 and the rear groove 25 are preferably equal, but are formed with different lengths. You can also.

  The embossed groove E is desirably provided at the stage of the absorber 4 alone or the absorber 4 surrounded by the encapsulating sheet 5.

  On the other hand, as shown in FIG. 1, a pair of left and right fit embosses F are formed along the substantially longitudinal direction of the sanitary napkin 1 at least on both sides of the embossed groove E from the skin contact surface side of the sanitary napkin 1. ing. The “fit emboss” is an embossed groove that integrates the surface material and the absorbent body 4, and is an embossed groove that is applied from the surface side of the liquid-permeable surface sheet 3 to a predetermined depth of the absorbent body 4. It is. The fit emboss F is formed in a region overlapping the main body misalignment-preventing adhesive layer 10. That is, by forming the fit emboss F in the region bonded and fixed to the underwear by the body misalignment-preventing adhesive layer 10, the central region of the absorbent body is projected to the skin contact surface side with the fit emboss F as a base point. This makes it easy to cause various deformations.

  As the fit emboss F, an area corresponding to the crotch of the wearer is formed in a pair of left and right crotch embosses 30 and 30 along the substantially longitudinal direction of the sanitary napkin 1, and an area corresponding to the buttocks of the wearer. A pair of left and right rear embosses 31 and 31, and an intermediate region emboss formed in a middle region between the crotch portion emboss 30 and the rear portion emboss 31 with a gap between the embosses 30 and 31. 32 is included.

  Further, on the front side of the crotch embossing 30 (in the case where the absorber middle high part 6 is provided as in the illustrated example, the front side of the front end of the absorber middle high part 6) and on the front side of the central region M, A substantially umbrella-shaped front-end umbrella-shaped emboss 33 is formed at the center of the sanitary napkin 1 in the width direction, and a front-end design emboss 34 is further formed so as to surround a region on the front side. On the other hand, on the rear side of the rear part emboss 31 (when the absorber middle high part 6 is provided as in the illustrated example, on the rear side from the rear end of the absorber middle high part 6) and behind the central region M. On the side, a substantially umbrella-shaped rear-end umbrella-like emboss 35 is formed at the center of the sanitary napkin 1 in the width direction, and a rear-end design emboss 36 is formed on the further rear side.

  In the example shown in FIG. 1 and FIG. 2, it is preferable that the main body anti-slipping adhesive layer 10 is continuously provided substantially from the front end portion of the front end design emboss 34 to the rear end portion of the rear end design emboss 36. . Further, the front body misalignment-preventing adhesive layer 11 is provided from the front end portion of the front end design emboss 34 to the rear end portion of the front end umbrella-like emboss 33 (front end portion of the absorber middle high portion 6), and the rear main body misalignment stopper The pressure-sensitive adhesive layer 11 is provided from the rear end portion of the rear end design emboss 36 to the front end portion of the rear end umbrella-shaped emboss 35 (rear end portion of the absorber middle high portion 6).

  The crotch embossing 30 includes a blood drainage port H, and a pair of left and right is formed along the substantially longitudinal direction of the sanitary napkin 1 in a range where the rear end is applied to the beginning portion of the valley of the buttocks. The front end portion is bent so as to be slightly enlarged on both sides, and the inclination angle is formed at an angle substantially parallel to the rear end portion of the front end design emboss 34.

  Further, the rear end portion of the crotch portion emboss 30 has a shape inclined to the center portion in the width direction within a range having an overlap margin in the width direction with the embossing groove 23 for the perineum portion, and the inclination angle thereof is the perineum portion. A predetermined inclination angle is set in relation to the embossed groove 23 for use. Specifically, an imaginary line S1 extending the inclined rear end of the crotch emboss 30 and a virtual line S2 connecting the front end of the front groove 24 and the rear end of the rear groove 25 of the perineum embossing groove 23; Are formed substantially parallel to each other. “Substantially parallel” means not only the case where the inclination angles of the virtual lines S1 and S2 with respect to the longitudinal line of the napkin completely coincide with each other, but also the case where the inclination angle is formed within an angular difference of ± 5 °. Including.

  By setting the rear end portion of the crotch portion emboss 30 to the above-described inclination angle, the rear end portion of the crotch portion emboss 30 allows the action direction of the leg pressure from both sides to change the front end of the front groove 24 and the rear end of the rear groove 25. Can be converted to a direction perpendicular to the virtual line S2 connecting the two, and the region surrounded by the front groove 24 and the rear groove 25 of the embossing groove 23 for the perineum can be easily raised by leg pressure from both sides. it can.

  The rear embossing 31 is formed in a pair corresponding to the left and right along the substantially longitudinal direction of the sanitary napkin 1 in a range corresponding to the valley of the buttocks, and the center in the width direction of the absorber at the rear is along the valley of the buttocks. It is intended to be raised exactly. The rear part emboss 31 is formed by a curve in which the substantially front half bulges outward, and the remaining rear side bulges inward. Further, the rear end portion is formed in a shape bent in a semicircular arc shape toward the outside.

  In the rear part emboss 31, fit embosses 31 a, 31 a... Extending from the rear part emboss 31 to the center side in the napkin width direction are formed at positions corresponding to the absorber defect part 22. Thereby, it becomes possible to bend along the roundness in the front-rear direction of the buttocks at the formation position of the absorber defect portion 22 with the fit emboss 31a as a base point.

  The intermediate emboss 32 is formed such that a part of the rear end portion and the front end of the crotch portion emboss 30 has an overlap with respect to the direction orthogonal to the virtual line S2. As a result, the rigidity of the absorber 4 in the double embossed portion of the crotch emboss 30 and the intermediate emboss 32 having an overlap margin in the direction orthogonal to the imaginary line S2 is increased. It becomes easy to convert into the force which raises the area | region enclosed by the front groove | channel 24 and the back groove | channel 25 of the embossing groove | channel 23 for pubic parts.

[Other examples]
(1) As shown in FIG. 9, the main body displacement preventing adhesive layers 10 and 10 may be formed so that the separation width of the crotch portion is larger than the separation width of the rear portion. The separation width of the crotch part is preferably equal to or greater than the width of the crotch part of the absorber middle high part 6. When the thickness of the absorber middle-high portion 6 is thick, deformation that causes the absorber to rise is difficult to occur, which is effective in such a case. At this time, the front end portions of the front grooves 24, 24 of the perineum embossing groove 23 are overlapped with the main body misalignment-adhering adhesive layers 10 and 10 of the crotch portion having a large separation width, so that the perineum portion of the absorber is stably provided. Is raised in a triangular pyramid shape.
(2) Further, as shown in FIG. 10, the main body misalignment-preventing adhesive layers 10 and 10 are partially interposed between the liquid-permeable top sheet 3 and the liquid-impervious back sheet 2 with the absorbent body 4 interposed therebetween. It may be formed so as to extend outward from the formed main body portion. Thereby, the fixing force to the underwear of the main body displacement prevention adhesive layer can be increased. However, it is preferable to form the wing-shaped flaps W and W so as not to exceed the fold lines RL and RL. If the main body slip-off adhesive layer 10 is formed beyond the folding line RL, the wing slip-off adhesive layer 8 and the main body slip-off adhesive layer 10 are easily adhered when the sanitary napkin 1 is attached. It becomes difficult to do. Further, the longitudinal range beyond the main body portion is preferably from the rear end portion of the front main body misalignment-preventing adhesive layer 11 to the rear end portion of the perineum embossing groove 23. By extending this range outside the main body part, the fixing strength with the undergarment from the blood drainage port can be increased, and the central area of this range can be raised firmly to the skin contact surface side, The degree of adhesion with the skin can be increased.

  DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Liquid impervious back sheet, 3 ... Liquid permeable top sheet, 4 ... Absorber, 5 ... Encapsulating sheet, 6 ... Absorber middle high part, 7 ... Side nonwoven fabric, 10.11 ... Main body misalignment-adhesive layer, 20 ... Embossed groove for buttocks, 22 ... Absorber missing part, 23 ... Embossed groove for perineum, 24 ... Front groove, 25 ... Back groove, 26 ... Embossed groove for crotch part, 30 ... Crotch Part embossing, 31 ... rear part embossing, 32 ... intermediate embossing, C ... intersection, E ... embossing groove, F ... fit embossing

Claims (5)

In an absorbent article in which an absorbent body is interposed between the liquid-permeable surface sheet and the back sheet, and a non-slip adhesive layer is formed on the non-skin contact surface side of the back sheet,
A pair of left and right front grooves formed on the non-skin contact surface side of the absorbent body from the intersection of the center in the width direction behind the blood drainage port toward both sides diagonally forward, and the absorbent article from the intersection Y-shaped perineum embossing groove comprising a rear groove formed toward the rear along the longitudinal direction of
The center region including the rear groove is not formed with the anti-slipping adhesive layer, and the anti-slipping adhesive layer is formed on both sides along the longitudinal direction of the absorbent article. Goods. Longitudinal to the crotch part including the blood drainage port part on the front side from the formation position of the embossing groove for the perineum part, on the non-skin contact surface side of the absorbent body, and in the center part in the width direction of the absorbent article An embossed groove for the crotch part is formed along the direction, and at the rear side from the formation position of the embossed groove for the perineum part, the non-skin contact surface side of the absorbent body and the center in the width direction of the absorbent article An intermittent embossing groove for the buttocks along the longitudinal direction is formed in the part,
The absorptive article according to claim 1 in which said slip prevention adhesive layer is not formed in the central field containing said embossed groove for crotch parts, and the embossed groove for hips. The absorbent article according to any one of claims 1 and 2 , wherein a tip end portion of a front groove of the perineum embossing groove is formed in a region overlapping with the anti-displacement adhesive layer. At least on both sides of the perineum embossed groove, the crotch embossed groove and the buttock embossed groove, a pair of left and right fit embosses from the skin contact surface side of the absorbent article along the substantially longitudinal direction of the absorbent article The absorbent article according to claim 2 , wherein the fit emboss is formed in a region overlapping the misalignment-preventing adhesive layer. A front and rear of the central region, the perineum for embossing grooves, according to claim 2, wherein the displacement preventing pressure-sensitive adhesive layer on the embossed grooves and hip embossing groove crotch portion is not formed region is formed Absorbent article.

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