JP2009131442A - Absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorbent article which can surely prevent side leakage through its surface, can visualize its effect against side leakage prevention in appearance, reduces the feeling of incompatibility by being easily fitted to the body, and makes the touch to the skin soft. <P>SOLUTION: In a sanitary napkin 1 in which an absorbent body 4 is interposed between a liquid-permeable surface sheet 3 and a liquid-impermeable back surface sheet 2 and side nonwoven fabrics 7 and 7 are disposed respectively along the longitudinal direction at both side parts of the surface, embossing of composite wavy lines in which the roughly simple harmonic waveform of a relatively short cycle is piled up on the roughly simple harmonic waveform of a relatively long cycle is practically imparted respectively to the side nonwoven fabrics 7 from the surface side so as to be along the longitudinal direction of the napkin 1, go back and forth over the side end edge of the absorbent body 4 and be line-symmetrical to the longitudinal direction center line CL of the napkin 1. In a side part area corresponding to a blood discharge port part H at least, the roughly simple harmonic waveform component of the relatively long cycle of the embossing 20 is arranged so as to be protruded to the inner side. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to absorbent articles for women such as sanitary napkins, panty liners, incontinence pads, etc. for absorbing menstrual blood and vaginal discharge. The present invention relates to an absorbent article that is softened so that the effect of preventing side leakage can be visually recognized in appearance.

  Conventionally, as an absorbent article N such as a sanitary napkin, a panty liner, a cage sheet, an incontinence pad, for example, as shown in FIG. 8, a back sheet 50 made of a polyethylene sheet or a polyethylene laminated nonwoven fabric, a nonwoven fabric or An absorbent body 52 made of cotton-like pulp or the like is interposed between the liquid-permeable surface sheet 51 made of a permeable plastic sheet or the like, and side nonwoven fabrics 53 and 53 are respectively arranged along the longitudinal direction on both sides of the surface. It is known that a flap portion where the absorber 52 is not interposed is formed on the outer edge of the absorber 52.

  When fixing the absorbent article N to the undergarment S, as shown in FIG. 9, apply the absorbent article N locally, take out the wing-shaped flaps W, W protruding sideways from the undergarment S, Both wing-shaped flaps W, W are folded at folding lines RL, RL, and adhered to the outer surface of the crotch portion of the underwear S while the crotch portion of the underwear S is wound around.

This type of absorbent article N is provided with embossed wires 54 and 55 in various forms from the surface side of the topsheet 51 in order to prevent side leakage and back-and-front leakage of menstrual blood discharged from the blood outlet. Are known (for example, see Patent Document 1 below).
Japanese Patent No. 3801127

  However, in such an absorbent article N, when a large amount of menstrual blood or the like is discharged, menstrual blood or the like passes over the embossed wires 54 and 55 and flows to the outside of the embossed wires 54 and 55 through the surface. There is a case. Here, menstrual blood or the like that has flowed out in the front-rear direction is less likely to leak back and forth by being absorbed by the absorber 52 because the absorber 52 is interposed in this direction for a relatively long time. The menstrual blood or the like may leak to the outside along the surface of the side nonwoven fabric 53 because the width of the absorbent article 52 is small due to the structure of the absorbent article, and this side leakage has been a problem.

  Moreover, in the conventional absorbent article N, since the embossed lines 54 and 55 are formed on the absorbent body, the effect is visually recognized against the lateral leakage of body fluid, and the wearer has a certain level of security. However, in this case, the effect of preventing side leakage cannot be clearly seen in the appearance, and it does not give a sufficient sense of security. There wasn't.

  Furthermore, even if the absorbent body is thin, it is relatively stiffer than other napkin components, so it is difficult to bend smoothly along the curve of the body and bend into a polygonal shape with a bending point. It was causing discomfort to the body.

  In addition, the flaps at both ends where the side nonwoven fabric is disposed are areas where the relatively high-rigidity back sheet is close to the body via the side nonwoven fabric without the presence of an absorber. It is necessary to make the skin soft by reducing as much as possible.

  Therefore, the main problem of the present invention is to prevent side leakage that propagates on the surface, and to visually confirm the effect of preventing side leakage and to easily fit the body to reduce the sense of incongruity, An object of the present invention is to provide an absorbent article having a soft touch.

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 liquid-impervious back sheet, and the both sides of the surface are respectively along the longitudinal direction. In the absorbent article in which the side nonwoven fabric is arranged,
Each of the side nonwoven fabrics is substantially embossed with a composite wavy line obtained by superimposing a relatively long-cycle substantially simple vibration waveform on a relatively long-cycle substantially simple vibration waveform along the longitudinal direction of the absorbent article. And is provided from the surface side so as to cross over the side edge of the absorbent body and to be axisymmetric with respect to the longitudinal center line of the absorbent article. The absorbent article is characterized in that a relatively long-cycle substantially simple vibration waveform component of the emboss is disposed so as to be convex inward in the side region corresponding to.

In the first aspect of the present invention, each of the side nonwoven fabrics is substantially embossed with a composite wavy line obtained by superimposing a relatively long-cycle substantially single vibration waveform on a relatively short-cycle substantially single vibration waveform. Along the longitudinal direction of the absorbent article, it is applied from the surface side so as to cross over the side edge of the absorbent body and to be axisymmetric with respect to the longitudinal center line of the absorbent article. Since at least the side region corresponding to the blood drainage port is disposed so that a relatively long-cycle substantially single vibration waveform component of the emboss is convex inward, the following (1) to (6) Various effects shown in the above can be achieved.
(1) Even if menstrual blood or the like flows to the side of the non-woven fabric, the embossed portion of the relatively long-cycle substantially single vibration waveform component corresponding to the blood discharge port portion of the embossing Since menstrual blood or the like stays at the side position and is absorbed by the absorber here, side leakage can be reliably prevented.
(2) Further, even if the body fluid that has reached the embossing then flows along the longitudinal direction of the absorbent article, the embossing has a relatively short period and a substantially short vibration waveform. Compared to the emboss formed with a simple wavy curve, the flow in the front-rear direction along the emboss is less likely to occur, and menstrual blood is drained. It becomes easy to stay in the vicinity of the part, and the effect of preventing side leakage is further enhanced.
(3) Since the emboss is formed as a composite wavy line obtained by superimposing a relatively short period of substantially simple vibration waveform on a relatively long period of substantially simple vibration waveform, the emboss can be given in a straight line or a simple Compared with the case where the wavy curve is applied, the concave area per unit length is increased, so that the contact area with the skin is reduced, and stuffiness and threading can be reduced.
(4) Since the embossing is applied from the surface side of the side nonwoven fabric, the embossing can be clearly seen in appearance and can give a sense of security of preventing side leakage.
(5) When this absorbent article is curved along the body, a bent line is formed in the width direction at the convex portion inside the relatively short-cycle substantially single vibration waveform component constituting the wavy outline of the emboss. It becomes easy. The bending line of this side nonwoven fabric becomes a bending line that bends the absorbent body in a polygonal shape that is almost an arc line with a small distance between the corners, thereby making it easier for the absorbent article to fit on the body and reducing discomfort during wearing. become able to.
(6) The emboss is formed so as to cross over the side edge of the absorber. In other words, since it is formed in a range from the side edge portion of the absorber to the relatively rigid back sheet portion, the portion that comes into contact with the body through the side nonwoven fabric is made as soft as possible. be able to.

  In the present invention according to claim 2, in the embossed region in which the relatively long-cycle substantially simple vibration waveform component is convex outward, an independent point-like emboss is provided at an inner position of the embossed region that is spaced apart from the embossed region. Or the absorbent article of Claim 1 to which the hieroglyphics embossing, such as a flower shape, is provided.

  According to the second aspect of the present invention, in the embossed region where the relatively long period substantially simple vibration waveform component is convex outward, an independent point-like emboss is provided at an inner position of the embossed region that is spaced apart from the embossed region. Or it is made to give hieroglyph embossing, such as a flower shape. By the independent dot embossing or the elephant embossing such as a flower shape, the flow in the lateral direction such as menstrual blood can be retained, the absorption into the absorbent body can be effectively performed, and along the embossed line The flow in the front-rear direction can be prevented. Furthermore, the point-like embossing or the hieroglyphic embossing also has a role of emphasizing the wave-like embossing, making it easier to visually recognize the effect of preventing side leakage.

  As the present invention according to claim 3, there is provided the absorbent article according to any one of claims 1 and 2, wherein the emboss is a continuous linear emboss.

  According to a fourth aspect of the present invention, the embossing is an embossing that forms a pseudo linear shape as a whole by connecting discrete embossing composed of point-like embossing, dotted line-like embossing, elephant embossing such as flower shape, or a combination thereof. An absorbent article according to any one of 1 and 2 is provided.

  The inventions according to claims 3 and 4 define a specific form of the embossment according to claim 1. As in the invention described in claim 3, continuous linear embossing is desirable from the viewpoint of preventing side leakage, but as in invention of claim 4, dot embossing, dotted line embossing, flower shape, etc. The same effect can be obtained even if the embossing shown in the form of a pseudo-line as a whole is formed by connecting the discrete embossing made of the above-mentioned hieroglyphics or a combination thereof. In this case, the appearance and the feminine tenderness can be emphasized by embossing in appearance.

  As described above in detail, according to the present invention, side leakage on the surface can be surely prevented, and the effect of preventing side leakage can be visually recognized, and the fit to the body is reduced, and the uncomfortable feeling is reduced, and the skin is softened. Can be a thing.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 is a partially broken development view of a sanitary napkin 1 according to the present invention, and FIG. 2 is a view taken along the line II-II in FIG.

  The sanitary napkin 1 includes a liquid-impervious back sheet 2 made of a polyethylene sheet, a polypropylene sheet, etc., a liquid-permeable front sheet 3 that allows permeation of menstrual blood, cages, and the like, and a space between the two sheets 2 and 3. An absorbent body 4 made of cotton-like pulp or synthetic pulp intervening in the sheet, crepe paper 5 surrounding the absorbent body 4 for maintaining the shape and improving the diffusibility of the absorbent body 4, and longitudinally on both sides of the surface. It is comprised from the side nonwoven fabrics 7 and 7 formed along the direction. Around the absorber 4, at the upper and lower edge portions, the outer edge portions of the liquid-impervious back sheet 2 and the liquid-permeable surface sheet 3 are joined by an adhesive such as hot melt or an adhesive means such as heat seal. In addition, the liquid-impervious back sheet 2 and the side nonwoven fabric 7 that extend laterally from the absorbent body 4 at both side edges thereof are bonded to each other by an adhesive such as hot melt or an adhesive means such as heat seal. The flap portion F is formed on the outer periphery of the absorber 4.

Hereinafter, the structure of the sanitary napkin 1 will be described in detail.
As the liquid-impermeable back sheet 2, a sheet material having at least water shielding properties such as an olefin resin sheet such as polyethylene or polypropylene is used. In addition, a laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet or the like, or A nonwoven fabric sheet (in this case, the waterproof film and the nonwoven fabric constitute a liquid-impervious back sheet) can be used after substantially impervious to liquid imperviousness by interposing a waterproof film. In recent years, those having moisture permeability tend to be used from the viewpoint of preventing stuffiness. This water- and moisture-permeable sheet material is a microporous sheet obtained by forming a sheet by melting and kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, and then stretching in a uniaxial or biaxial direction. It is.

  Next, as the liquid-permeable surface sheet 3, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. Examples of the material fibers constituting the nonwoven fabric include synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a lace 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.

  The absorbent body 4 interposed between the liquid-impervious back sheet 2 and the liquid-permeable top sheet 3 is made of, for example, fluffy pulp and a water-absorbing polymer. The water-absorbing polymer is mixed in the pulp constituting the absorber, for example, as granular powder. Examples of the pulp include chemical fibers obtained from wood, cellulose fibers such as dissolving 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. When the crepe paper 5 surrounding the absorbent body 4 is provided as in this example, the crepe paper 5 is interposed between the liquid-permeable surface sheet 3 and the absorbent body 4 as a result. The crepe paper 5 which is excellent in diffusing body fluids quickly prevents reversal of menstrual blood and the like. In addition, the use surface side of the sanitary napkin 1 can be embossed (not shown) in an appropriate shape.

  On the other hand, side non-woven fabrics 7 and 7 are provided on both sides of the sanitary napkin 1 along the longitudinal direction and almost the entire length of the napkin 1, respectively. Wing-like flaps W, W are formed by a part of the liquid-impervious back sheet 2 that extends sideways and also extends sideways.

  As the side nonwoven fabric 7, a water-repellent treated nonwoven fabric or a hydrophilic treated nonwoven fabric can be used from the viewpoint of an important function. For example, if importance is placed on functions such as preventing permeation of menstrual blood or vaginal discharge, or enhancing the touch feeling, water repellent treatment coated with silicon, paraffin or alkylchromic chloride water repellent It is desirable to use a nonwoven fabric. Further, if importance is attached to the absorption of menstrual blood and the like in the wing-shaped flaps W, W, a method of polymerizing a compound having a hydrophilic group, for example, an oxidation product of polyethylene glycol, in the process of producing a synthetic fiber, , By treating with a metal salt such as stannic chloride, partially dissolving the surface to make it porous, and depositing metal hydroxides to swell or make the synthetic fiber porous, applying capillary action to make it hydrophilic The hydrophilic treatment nonwoven fabric which gave is used.

  As the side nonwoven fabric 7, it is preferable to use a bulky nonwoven fabric such as an air-through nonwoven fabric. By making the side nonwoven fabric 7 into a bulky nonwoven fabric, when embossing is added to the side nonwoven fabric 7, the depth of the groove can be formed deeply, so that (1) the effect of retaining menstrual blood or the like is easily exhibited. The effect of reducing the contact area with the skin, and (3) making the embossing easy to visually recognize can be obtained. Moreover, the said side nonwoven fabric 7 can show | play the said effect notably further by making it have the double sheet | seat part turned back to the lower surface side by the side edge part.

  In the sanitary napkin 1 according to the present invention, each of the side nonwoven fabrics 7 and 7 is substantially a relatively long-cycle substantially simple vibration waveform (hereinafter referred to as a “long-cycle waveform”) and has a relatively short cycle. An emboss of a composite wavy line superposed with a simple vibration waveform (hereinafter referred to as “short-period waveform”) runs along the longitudinal direction of the sanitary napkin 1 and straddles the side edge of the absorbent body 4. In addition, the embossing is applied to the sanitary napkin 1 from the surface side so as to be symmetrical with respect to the longitudinal center line CL, and at least in the side region corresponding to the blood drainage port H, the emboss is relatively long It arrange | positions so that the substantially single vibration waveform component of a period may become convex inside.

[First example of embossing]
As shown in FIG. 1, the embossing according to the first embodiment formed on the above-described side nonwoven fabric 7 is formed by superimposing the short-period waveform on each of the side nonwoven fabrics 7 and 7 by continuous lines. An emboss 20 of combined composite wavy lines is formed.

  The long-period waveform has a wavelength that is the length in the longitudinal direction for one cycle of 1/2 to 1/6, preferably 1/3 to 1/4 of the length in the longitudinal direction of the napkin 1. Good. In addition, after setting the initial phase such that the extreme values of the short period waveform overlap each extreme value of the long period waveform, the wavelength of the long period waveform is a wavelength that is an integral multiple of the wavelength of the short period waveform. It is preferable that As a result, the extreme value of the long-period waveform and the extreme value of the short-period waveform can always be matched, and the appearance can be improved.

  Further, in the sanitary napkin 1 of the present invention, at least a side region corresponding to the blood drainage port H is used so that menstrual blood or the like stays at a relatively inward position of the absorber 4 and is absorbed by the absorber. The long-period waveform component of the emboss 20 is arranged so as to be convex inward, but the phase of the short-period waveform is convex inward as shown in FIG. It is desirable that the pole portion is convex outward. As a result, as shown in FIG. 3, it is possible to make it difficult for body fluid or the like flowing out from the blood drainage port H to the emboss 20 to diffuse in the front-rear direction. Furthermore, since the emboss 20 has a composite wave shape in which a short period waveform is superimposed on a long period waveform, the flow in the front-rear direction along the emboss 20 from the part where the embosses 20 and 20 are formed narrowly is performed. It is difficult to occur and absorption into the absorber 4 is promoted.

  On the other hand, as described above, the embossed 20 applied from the surface side of the bulky side nonwoven fabric 7 has a brighter color tone than other parts and can be clearly identified visually. The effect can be clearly seen in appearance, and the wearer can be given a sense of security to prevent side leakage.

  On the other hand, as shown in FIG. 4, when the sanitary napkin 1 is bent along the body, the side nonwoven fabric 7 is bent in the width direction at the convex portion inside the short-period waveform component of the emboss 20. Lines 30, 30... Are easily formed. This is because bending stress concentrates on the embossing poles convex inside the short period waveform and bends. The bending lines 30, 30... Of the side nonwoven fabric 7 formed in this way bend the absorbent body 4 in a polygonal shape having a small distance between the corner break points and almost an arcuate line. It is easy to fit the body smoothly and can reduce the feeling of strangeness when worn.

  The emboss 20 is formed so as to cross the side edge of the absorbent body 4 to the left and right. As a result, the side leakage prevention is achieved as described above, and at the same time, the emboss 20 formed on the side nonwoven fabric 7 per unit length is longer than when embossing is provided with a straight line or a simple wavy curve. Therefore, the area of contact with the skin is reduced, so that stuffiness and threading can be reduced. Moreover, the embossing 20 is formed in a range extending from the side edge portion of the absorber 4 to the relatively rigid back sheet portion by going back and forth across the side edge of the absorber 4. Therefore, the portion in contact with the body through the side nonwoven fabric 7 can be made as soft as possible.

  By the way, as shown in FIG. 1, in the embossed region that protrudes outward due to the long-period waveform component of the emboss 20, an independent point-shaped emboss 21 or It is preferable to apply the hieroglyphics 22.

  As a result, as shown in FIG. 3, body fluid or the like that diffuses in the front-rear direction along the emboss 20 from the portion where the space between the embosses 20, 20 is narrow is retained by the dot-like emboss 21 or the hieroglyph-like emboss 22. Can be absorbed, and absorption into the absorber is promoted. In addition, in the area | region where the embossing 20 protrudes on the outer side of the absorber 4, it is preferable to set it as the hieroglyphic emboss 22 of the comparatively big dimension which straddles on the absorber 4. FIG.

  As shown in FIG. 5 (A), the dot-like emboss 21 preferably has a shape such as a circle or an ellipse, and preferably has no corners in consideration of contact with the skin. . In addition, as the above-mentioned elephant emboss 22, there is an emboss shaped in various shapes such as a flower shape in which the ellipses in FIG. 5B are close, a flower shape in which the ellipses in FIG. can do. The point-like emboss 21 and the ellipsoidal emboss 22 are preferably embossed in which the inside of the closed curve is recessed, but may be embossed in which the closed curve is recessed in a fringe manner.

[Second example of embossing]
The embossing 23 which concerns on 2nd form example shown by FIG.6 and FIG.7 connects the discrete embossing which consists of the dotted | punctate embossing 21 and / or the hieroglyphic embossing 22 which were provided from the surface side to each of the side nonwoven fabrics 7 and 7. FIG. As a result, a pseudo-wire shape is formed as a whole. In the illustrated example, the composite wavy line 24 connecting the insides of the discrete embosses runs along the longitudinal direction of the napkin 1 and crosses the side edge of the napkin 1, and the longitudinal center line of the napkin 1. It is applied from the surface side so as to be line symmetric with respect to CL, and is arranged so that the long-period waveform component of the emboss 23 is convex inward in at least the side region corresponding to the blood drainage port H. Yes. Even when such discrete embossing is applied, the same effect as that of the first embodiment can be obtained by forming the composite wavy line 24 connecting the discrete embosses into the above-described shape.

  In the illustrated example, the discrete embossing is configured by a combination of the point-like embossing 21 and the hieroglyphic embossing 22, but it may be configured by the point-like embossing 21 alone or the hieroglyphing embossing 22 alone, or a short straight line “-”. It is good also as the dotted-line-like embossing which continued.

It is a partial fracture development view of sanitary napkin 1 concerning the present invention. It is the II-II arrow directional view of FIG. It is a principal part enlarged view of FIG. 1 explaining the flow of body fluids. It is an expanded view of the sanitary napkin 1 which shows the bending line 30 when the sanitary napkin 1 is curved. (A) is an enlarged view showing a dotted emboss 21 and (B) to (D) are hieroglyphics 22. It is an expanded view of the sanitary napkin 1 which shows the example (the 1) of discrete embossing. It is an expanded view of the sanitary napkin 1 which shows the example (the 2) of discrete embossing. It is a partially broken development view showing a conventional absorbent article N. It is a perspective view which shows the mounting state of the absorbent article N. FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Impervious back sheet, 3 ... Impervious surface sheet, 4 ... Absorber, 5 ... Crepe paper, 7 ... Side nonwoven fabric, 20/23 ... Embossing, 21 ... Point embossing, 22 ... Embossed emboss, 24 ... Compound wavy line, W ... Wing flap

Claims (4)

In the absorbent article in which the absorbent body is interposed between the liquid-permeable surface sheet and the liquid-impermeable back sheet, and the side nonwoven fabric is disposed along the longitudinal direction on both sides of the surface,
Each of the side nonwoven fabrics is substantially embossed with a composite wavy line obtained by superimposing a relatively long-cycle substantially simple vibration waveform on a relatively long-cycle substantially simple vibration waveform along the longitudinal direction of the absorbent article. And is provided from the surface side so as to cross over the side edge of the absorbent body and to be axisymmetric with respect to the longitudinal center line of the absorbent article. An absorbent article characterized in that a relatively long-cycle substantially simple vibration waveform component of the emboss is disposed so as to be convex inward in a side region corresponding to.   In the embossed region in which the relatively long-cycle substantially single vibration waveform component is convex outward, an independent point-like emboss or an embossed shape such as a flower shape is provided on the inner side of the embossed region and spaced apart from the emboss. The absorbent article according to claim 1.   The absorbent article according to claim 1, wherein the emboss is a continuous linear emboss.   The absorption according to any one of claims 1 and 2, wherein the embossing is a quasi-linear embossing as a whole by connecting point embossing, dotted line embossing, elephant embossing such as flower shape, or discrete embossing composed of a combination thereof. Sex goods.

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