JP2000152957A - Sanitary napkin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sanitary napkin, which can follow physical motions well and is good at an absorptive property. SOLUTION: This sanitary napkin 1 comprises a narrow upper absorptive part 2 and a broad lower absorptive part 3. The respective absorptive cores 12, 13 of the upper and lower absorptive parts 2, 3 come into contact with each other in the neighborhood of a central part in the cross direction of the napkin 1. A middle sheet 8, which is waterproof and has an elastic expansion in the longitudinal direction of the napkin 1, intervenes between the upper and lower absorptive parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sanitary napkin, and more particularly, to a sanitary napkin that can follow the movement of the vaginal opening even when the position of the vaginal opening and the shorts is shifted.

[0002]

2. Description of the Related Art An absorbent article disclosed in JP-A-10-33589 is an example of a sanitary napkin, and is interposed between a liquid-permeable top sheet and a liquid-impermeable back sheet. The absorber has an upper absorber and a lower absorber substantially in a non-contact state with each other, and the center region in the width direction is particularly thick, and the upper absorber can move in the width direction or the longitudinal direction with respect to the lower absorber. As in one continuous topsheet. It is described that such an absorbent article (sanitary napkin) fits the body without being affected by the movement of the wearer.

[0003]

In the known sanitary napkin, even when the upper absorbent body can move relatively freely, when the vaginal opening and the napkin are separated from each other in the up and down direction, the upper absorbent body is not used. Since there is no means for following the vaginal opening of such movement, it is difficult to reliably capture menstrual blood, which may cause menstrual leakage. In addition, since the upper and lower absorbers are in a non-contact state, while the upper absorber is in close contact with the vaginal opening, it is possible to utilize the absorption capacity of the lower absorber despite the presence of the lower absorber. This can lead to discomfort when wearing a napkin and may cause menstrual leakage.

An object of the present invention is to improve the followability of the upper absorbent body to the vaginal opening in a sanitary napkin having two upper and lower absorbent bodies, and at the same time, the absorption capacity of the upper absorbent body and the lower absorbent body. To provide a sanitary napkin that can prevent menstrual leaks by utilizing the same.

[0005]

In order to solve the above problems,
The present invention is based on the assumption that a liquid-permeable top sheet, a liquid-impervious back sheet, and an absorbent core located between these two sheets are long in the longitudinal direction and orthogonal to the longitudinal direction. The sanitary napkin has a particularly thick central region in the width direction.

On the premise, the features of the present invention are as follows. A first core positioned in the central region and extending in the vertical direction;
A second core that is located on the lower surface side of the core and that is wider than the first core extending in the longitudinal direction, wherein the first core has an upper surface, a side surface, and a lower surface of the first core. The remaining part except the central part in the width direction is covered with the topsheet. In the second core, a remaining upper surface portion of the second core upper surface excluding a width direction central portion facing the first core width direction central portion in the same width as the first core width direction central portion is covered by the topsheet, and The lower surface of the core is covered with the back sheet, and the side surface of the second core is covered with any of the front and back sheets. In the topsheet, a portion covering the lower surface of the first core and a portion covering the upper surface of the second core are connected on both sides of the widthwise central portion of the first and second cores, respectively. A fold curve extending in the direction is formed. Between the top sheet of the portion covering the lower surface of the first core and the top sheet of the portion covering the upper surface of the second core, a liquid resistant sheet having elasticity in the longitudinal direction is interposed, The liquid-resistant sheet is stretched in the longitudinal direction, and both ends of the sheet are fixed to both ends of the napkin, and the inner edge of the sheet is fixed to the top sheet in the vicinity of the folding curve, and An outer edge is located near a side edge of the first core. The first core and the second core are connected to each other in the center in the width direction so that menstrual blood can be transferred from the first core to the second core.

In one embodiment of the present invention, each of the first and second cores contains 40 to 100% by weight of a hydrophilic fiber, and the density of the hydrophilic fiber component of the second core is lower than that of the first core. It is the same as or higher than the density of the hydrophilic fiber component.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the sanitary napkin according to the present invention will be described below with reference to the accompanying drawings.

The sanitary napkin 1 shown in a partially cutaway perspective view in FIG. 1 is vertically long, symmetrical about a center line C-C that bisects the width, and has a relatively small width dimension. It has an upper absorbing portion 2 and a lower absorbing portion 3 which is relatively large in the width direction and is located below the upper absorbing portion 2, and the central portion in the width direction is particularly thick. The upper surface of the napkin 1 that contacts the skin of the napkin wearer is formed of a liquid-permeable top sheet 6, and the lower surface of the napkin 1 that contacts the shorts worn is formed of a liquid-impermeable sheet 7. A liquid-resistant intermediate sheet 8 is located between the top sheet 6 covering the upper absorbent section 2 and the top sheet 6 covering the lower absorbent section 3, and the sheet 8 extends in the vertical direction. . The upper absorber 2
A menstrual-absorbing upper core 1 that adheres to the inside of the topsheet 6
2, and the lower absorbent portion 3 has a menstrual-absorbable lower core 13 that is in close contact with the inside of the topsheet 6. The vertical dimension of the upper core 12 and the lower core 13 is substantially the same, or the dimension of the lower core 13 is large. The dimension of the upper core 12 and the lower core 13 in the width direction is larger than that of the lower core 13, and the width of the upper core 12 is １ ／ of the width of the lower core 13.
It is in the range of 3/4. The front and back sheets 6 and 7 overlap at portions extending from both side edges of the lower core 13 and are joined to each other. The front and back sheets 6 and 7 and the intermediate sheet 8 overlap at portions extending from both end edges of the upper and lower cores 12 and 13 and are joined to each other.

FIG. 2 is a view showing a cut surface along a center line II-II which bisects the vertical dimension of the napkin 1 in FIG. The topsheet 6 is provided on the upper surface 1 of the upper core 12.
2A, both side surfaces 12B, and a portion of the lower surface 12C excluding the central portion E in the width direction. Further, the topsheet 6 covers the portion of the upper surface 13A of the lower core 13 excluding the width center portion E, and both side surfaces 13B, and is joined to the backsheet 7 outside the both side surfaces 13B. However, the side surface 13B may be covered with the back sheet 7 instead of the top sheet 6. The topsheet 6 is bent along fold curves 14 extending in the vertical direction on both sides of the width direction central portions E of the upper and lower cores 12 and 13 (see also FIG. 1). Lower surface 12C of upper core 12
The liquid-resistant intermediate sheet 8 located between the top sheet 6 covering the upper surface and the top sheet 6 covering the upper surface 13A of the lower core 13 has a hot-melt inner edge 18. The outer edge 21 is bonded to the upper core 1 near the fold curve 14 via the adhesive 19 while
The second side surface 12B extends to the vicinity. Outer edge 21
, An elastic member 22 extending in the vertical direction is attached in an extended state, and the intermediate sheet 8 has elasticity in the vertical direction. That the intermediate sheet 8 is liquid-resistant means that the sheet 8 is liquid-impermeable or even if it is liquid-permeable, it does not have liquid permeability as high as the top sheet 6. It means that it has relatively high resistance to permeation of menses.

In the upper absorbent section 2, the upper core 12 is in close contact with the inner surface of the topsheet 6 and spreads with a substantially uniform thickness, and enters the lower absorbent section 3 at the central portion E in the width direction. The lower core 13 of the lower absorbent portion 3 includes a first portion 15A formed by the upper core 12 that has entered and a second portion 15B that is in close contact with the first portion 15A.
5A and 15B are in close contact with the inner surface of the topsheet 6. The upper and lower cores 12 and 13 can be bonded to the inner surface of the topsheet 6 via a hot melt adhesive as needed.

An adhesive 23 is applied to the lower surface 7 B of the back sheet 7, and the adhesive 23 is covered with a release paper 24. The napkin 1 can be fixed to the inner surface of the shorts by the adhesive 23.

FIG. 4 is a perspective view of the napkin 1 attached to the inner surface of the crotch region of the shorts 24 and curved in the vertical direction, and a drawing showing a cross section taken along the line IV-IV. When the napkin 1 is bent in the vertical direction, the elastic member 2 of the intermediate sheet 8 is
2, the intermediate sheet 8 rises such that the outer edge 21 pivots upward from the position shown in FIG. 2 with the inner edge 18 as a base end, and the upper absorbent portion 2 is moved to the vaginal opening of the napkin wearer. Can be pushed up towards.

FIG. 5 is a drawing similar to FIG. 4 illustrating the state of the napkin 1 worn. After the napkin 1 is worn, a positional shift may occur between the vaginal opening and the shorts 24 depending on the movement of the body. However, in this napkin 1, the upper absorbent portion 2 is not strongly restrained by the shorts 24, and relatively freely moves, for example, to the left as shown in FIG. Can be. Moreover, since the upper core 12 and the lower core 13 are substantially a series, menstrual blood absorbed by the upper core 12 shifts to the lower core 13, and the upper core 12 becomes saturated with menstrual blood. Can be slowed down or avoided. In the state in which the upper absorbent portion 2 is deflected to the side of the napkin 1 as shown in FIG. 5, menstrual blood tends to concentrate on the side portion of the napkin 1 where the width is narrow, and the lateral leakage easily occurs. Immediately below the absorbing section 2, a liquid-resistant intermediate sheet 8
Is located, the menstrual blood overflowing from the absorbing portion 2 can be received by the sheet 8, moved toward the widthwise central portion E of the napkin 1, and further absorbed by the lower absorbing portion 3. Therefore, even if the upper absorbent portion 2 is shifted to the side of the napkin 1, lateral leakage of menstrual blood hardly occurs. Upper absorption part 2
In order to promote the transfer of menstrual blood from the
The density of the hydrophilic fiber component forming the lower core 13 of the lower absorbent section 3 is equal to or higher than the density of the hydrophilic fiber component forming the upper core 12 of the upper absorbent section 2. Is preferred. For example, in the lower core 13,
The density of the hydrophilic fibers of the second portion 15B is the same as that of the first portion 15A.
Is preferably equal to or higher than the density of the hydrophilic fibers.

FIG. 6 is a drawing similar to FIG. 4 showing an example of the embodiment. In this napkin 1, a first portion 15A of the lower core 13, which is a portion of the upper core 12 entering the lower absorbent portion 3, extends to the side edge of the napkin 1 along the inner surface of the topsheet 6. The second portion 15B is located below the extended portion.

In the present invention, a nonwoven fabric or an open plastic film can be used for the top sheet 6, and a plastic film can be used for the back sheet 7.
As the intermediate sheet 8, besides a nonwoven fabric or an apertured plastic film having a lower liquid permeability than the top sheet 6, a liquid impervious sheet similar to the back sheet 7 can be used. The topsheet 6 may be made of a hydrophobic nonwoven fabric obtained by subjecting a required portion of the nonwoven fabric to a hydrophilic treatment. For the upper core 12 and the lower core 13, a hydrophilic nonwoven fabric or a molded product of pulverized pulp, a mixture of pulverized pulp and a superabsorbent polymer, or the like can be used. To join the members of the napkin 1, it is possible to bond them with a hot melt adhesive or the like, or to weld them with heat or ultrasonic waves.

[0017]

The sanitary napkin according to the present invention has an upper absorbent portion and a lower absorbent portion. Even when the napkin is fixed to the shorts worn, the upper absorbent portion is moved by the action of the elastic intermediate sheet. And the absorbent cores are in contact with each other between the upper and lower absorbent portions, so that menstrual blood can transfer from the upper absorbent portion to the lower absorbent portion. When the upper absorbent portion is deflected to the side of the napkin, the liquid-resistant intermediate sheet acts to collect menstrual blood at the central portion in the width direction of the napkin, thereby preventing lateral leakage of menstrual blood. With such a napkin, there is no risk of menstrual leakage even when the wearer moves actively.

[Brief description of the drawings]

FIG. 1 is a partially broken perspective view of a sanitary napkin.

FIG. 2 is a sectional view taken along the line II-II of FIG. 1;

FIG. 3 is a perspective view of a napkin attached to shorts.

FIG. 4 is a view showing a cross section taken along line IV-IV of FIG. 3;

FIG. 5 is a view similar to FIG. 4, showing an example of a deformed state of the napkin.

FIG. 6 is a drawing similar to FIG. 4, showing an example of the embodiment;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sanitary napkin 6 Top sheet 7 Back sheet 8 Liquid resistance sheet (intermediate sheet) 12 1st core (upper core) 12A Upper surface 12B Side surface 12C Lower surface 13 2nd core (Lower core) 13A Upper surface 13B Side surface 13C Lower surface 14 Folding curve 18 Inside edge 21 Outside edge E Central part in the width direction

Claims (2)

[Claims] 1. A liquid-permeable top sheet, a liquid-impervious back sheet, and an absorbent core located between these two sheets, and are long in the vertical direction and have a center in the width direction orthogonal to the vertical direction. A sanitary napkin having a region formed particularly thick, wherein the core is located in the central region and extends in the longitudinal direction, and the first core is located on a lower surface side of the first core and extends in the longitudinal direction. A second core wider than the width of the first core extending to the first core. The first core includes an upper surface, a side surface, and a remaining portion of the lower surface excluding a central portion in the width direction. The second core is covered by the topsheet, and the second core is covered by the topsheet except for the widthwise center portion of the upper surface of the second core facing the same width as the first core widthwise center portion. And the lower surface of the second core is And the second core side surface is covered by any of the front and back sheets, and the top sheet covers a portion covering the lower surface of the first core and an upper surface of the second core. And the first and second cores are connected on both sides of the widthwise central portion of the first and second cores to form a bent curve extending in the longitudinal direction, and a topsheet of a portion covering the lower surface of the first core; A liquid-resistant sheet having elasticity in the vertical direction is interposed between the liquid-resistant sheet and the surface sheet of a portion covering the upper surface of the second core, and the liquid-resistant sheet is stretched in the vertical direction and Both ends of the sheet are fixed to both ends of the napkin, and the inner edge of the sheet is fixed to the top sheet near the folding curve, and the outer edge of the sheet is near the side edge of the first core. Is located The first core and the second core are connected to each other in the width direction central portions so that menstrual blood can be transferred from the first core to the second core. napkin. 2. The first and second cores each contain 40 to 100% by weight of a hydrophilic fiber, and the density of the hydrophilic fiber component of the second core is the same as the density of the hydrophilic fiber component of the first core. 2. The napkin of claim 1, wherein the napkin is or higher.