JP2023044802A - body fluid absorbent article - Google Patents

Abstract

To provide a body fluid absorbent article capable of enhancing absorptivity of a body fluid with an absorber and suppressing the reversion of the body fluid from the absorber.SOLUTION: A body fluid absorbent article 1 comprises a top sheet 2, a back sheet 3, and an absorber 4 disposed between the top sheet 2 and the back sheet 3, and absorbs with the absorber 4 a body liquid transmitted through the top sheet 2 on a side to be in contact with a user's skin. Recess unit patterns 12 recessed toward the absorber 4 side are repetitively arranged in the longitudinal direction and the cross direction of the top sheet 2 to form a plurality of recesses 9 in the top sheet 2, and the aperture area rate of the recesses 9 in the top sheet 2 is 4% or more but 10% or less.SELECTED DRAWING: Figure 6

Description

TECHNICAL FIELD The present invention relates to a body fluid absorbent article used for absorbing body fluids such as vaginal discharge, menstrual blood, sweat and urine.

BACKGROUND ART Conventionally, bodily fluid absorbent articles have been used to absorb bodily fluids such as vaginal discharge, menstrual blood, sweat and urine. A bodily fluid-absorbing article mainly has a three-layer structure comprising a top sheet that is permeable to body fluids, a back sheet that is impermeable to body fluids, and an absorbent body sandwiched between the top sheet and the back sheet. , the top sheet is brought into contact with the user's skin, and body fluids permeated through the top sheet are absorbed by the absorber.

In order to improve comfort during use of the body fluid-absorbing article, it is necessary to increase the absorbability of body fluids by the absorbent body so that body fluids do not remain on the top sheet, which is in contact with the skin, as much as possible so that body fluids do not come into contact with the user's skin. is important. As a means for this, a technique of forming a plurality of recesses in the top sheet by embossing or the like has been disclosed (see, for example, Patent Document 1).

JP 2020-014927 A

In the body fluid absorbent article, the absorbability of the body fluid by the absorbent body is enhanced by forming many concave portions in the top sheet. It is also necessary to suppress

SUMMARY OF THE INVENTION The present invention has been made to solve this problem, and aims to provide a body fluid-absorbing article that can enhance the absorption of body fluids by an absorbent body and can suppress backflow of body fluids from the absorbent body. aim.

The present invention comprises a top sheet, a back sheet, and an absorbent body disposed between the top sheet and the back sheet, and absorbs body fluids permeating through the top sheet on the side that contacts the user's skin. It relates to a body fluid absorbent article that absorbs with. In the body fluid absorbent article of the present invention, a plurality of recesses are formed in the top sheet by repeatedly arranging unit patterns of recesses recessed toward the absorbent body in the longitudinal direction and the lateral direction of the top sheet. , wherein the opening area ratio of the recesses in the top sheet is 4% or more and 10% or less.

In the body fluid-absorbing article of the present invention, preferably, a plurality of unit rows are arranged parallel to each other, and are configured by repeatedly arranging the unit patterns of the recesses in a direction inclined with respect to the longitudinal direction or the lateral direction of the top sheet. It can be configured to be characterized by

Further, in the body fluid-absorbent article of the present invention, preferably, the top sheet has a longitudinally elongated shape whose length in the longitudinal direction is longer than the length in the lateral direction, and the unit pattern of the concave portions is It can be configured to be characterized by repeatedly lining up in the direction of inclination.

Further, in the bodily fluid-absorbing article of the present invention, preferably, the top sheet has a vertically elongated shape in which the length in the vertical direction is longer than the length in the horizontal direction, and the unit pattern of the concave portions is It can be configured to be characterized by repeatedly lining up in the direction of inclination.

In the body fluid-absorbent article of the present invention, preferably, the top sheet has a plurality of dense regions in which a plurality of the recesses are gathered, and the plurality of dense regions are not formed with the recesses. It can be configured to be characterized by being surrounded by a sparse area.

According to the body fluid absorbent article of the present invention, it is possible to improve the absorbability of the body fluid by the absorbent body and to suppress the regurgitation of the body fluid from the absorbent body.

1 is a plan view of a bodily fluid absorbent article; FIG. Fig. 2 is a rear view of the bodily fluid absorbent article; FIG. 2 is a longitudinal sectional view showing an enlarged schematic configuration of a portion of the body fluid absorbent article; FIG. 10 is a longitudinal sectional view showing an enlarged schematic configuration of a portion of a modification of the top sheet. FIG. 4 is a plan view showing an enlarged portion of the top sheet; FIG. 4 is an explanatory diagram showing a unit pattern of recesses; FIG. 2 is a plan view of the body fluid-absorbing article and a diagram for explaining the arrangement of a plurality of recesses in the top sheet. FIG. 4 is an explanatory view showing a schematic configuration of a method of forming a plurality of recesses in a first raw material sheet that is a base of a top sheet; It is a perspective view showing a schematic structure of a pair of plate rolls. It is a figure explaining arrangement|sequence of several protrusions formed in the outer peripheral surface of a printing roll. It is a figure explaining arrangement|sequence of several recessed parts formed in the 1st raw material sheet. It is an explanatory view showing a schematic structure of a manufacturing method of a bodily fluid absorbent article.

A bodily fluid absorbent article is directly attached to a user's clothing (underwear, for example) or skin, and is used to absorb bodily fluids such as vaginal discharge, menstrual blood, sweat, and urine. Specific examples of bodily fluid absorbent articles include panty liners, sanitary napkins, incontinence pads, armpit sweat pads, sweat absorbing sheets, and the like.

A bodily fluid-absorbent article comprises at least three components: a top sheet permeable to bodily fluids, a back sheet impermeable to bodily fluids, and an absorbent body sandwiched between the top sheet and the back sheet capable of absorbing bodily fluids. It has a layered structure, and the absorber absorbs and retains bodily fluids that permeate the top sheet on the side that contacts the user's skin. The backsheet prevents body fluids from leaking from the absorbent body and adhering to the user's clothing during use.

One embodiment of the present invention will now be described with reference to the accompanying drawings. In the following embodiments, the side of the body fluid absorbent article that contacts the user's skin is referred to as the "front side", and the opposite side is referred to as the "back side".

Overall Configuration of Body Fluid Absorbent Article The body fluid absorbent article 1 of the present embodiment is a vaginal discharge sheet that is attached to a user's undergarments when in use. As shown in FIGS. 1 to 3, the body fluid-absorbent article 1 has a flat shape having main surfaces on the front side and the back side, and includes a top sheet 2, a back sheet 3, a top sheet 2 and a back sheet. and a sheet-like absorbent body 4 sandwiched between 3. The top sheet 2 , back sheet 3 , and absorbent body 4 are all formed to have the same outer shape (shape formed by the outer peripheral edge) and size, and match the outer shape and size of the body fluid absorbent article 1 . Note that the absorbent body 4 does not necessarily have the same outer shape and size as the top sheet 2 and the back sheet 3. For example, the absorbent body 4 may have the same outer shape as the top sheet 2 and the back sheet 3, but may be one size smaller ( For example, it may be small enough to fit inside the crimping portion 6 described later).

A bodily fluid absorbent article 1 has a top sheet 2, an absorbent body 4, and a back sheet 3 laminated in this order from the front side to the back side, and the top sheet 2 and the absorbent body 4 are bonded over the entire surface or substantially the entire surface. It is fixed by the layer 5, and the absorbent body 4 and the back sheet 3 are fixed by the adhesive layer 6 over the entire surface or substantially the entire surface. The back surface of the back sheet 3 is provided with an adhesive layer 7 for attaching the body fluid absorbent article 1 to the user's underwear.

The outer peripheral edge of the body fluid absorbent article 1 is subjected to thermocompression bonding, ultrasonic compression bonding, simple compression bonding in which only pressure is applied in the thickness direction, etc. over the entire circumference, thereby forming the crimped portion 8 . there is In the crimped portion 8, the top sheet 2, the absorbent body 4 and the back sheet 3 are strongly bonded, or the top sheet 2 and the back sheet 3 are strongly bonded, and the thickness of the crimped portion 8 is the same as that of the crimped portion 8. thinner than the thickness of the Although the width of the crimped portion 8 is not particularly limited, it is preferably 2 mm or more and 5 mm or less inward from the outer peripheral edge of the bodily fluid absorbent article 1 . Note that the crimped portion 8 does not necessarily have to be formed on the body fluid absorbent article 1 .

The bodily fluid absorbent article 1 preferably has an outer shape that matches the user's body part to which it is applied during use. In other words, the body fluid absorbent article 1 has a length in the longitudinal direction along the front-rear direction of the user's body, which is longer than the length in the lateral direction perpendicular to the longitudinal direction, and the longitudinal direction is the longitudinal direction. and the horizontal direction is the width direction. Here, the longitudinal direction of the body fluid absorbent article 1 is a reference direction when applying the body fluid absorbent article 1 to a predetermined site of the user in an appropriate orientation during use.

The body fluid-absorbing article 1 has a symmetrical shape with respect to a center line that bisects the dimension in the width direction and extends in the longitudinal direction, although not particularly limited thereto. The body fluid absorbent article 1 may or may not be symmetrical in the front-rear direction with respect to a center line that bisects the dimension in the longitudinal direction and extends in the width direction. Furthermore, the width of the body fluid absorbent article 1 is not particularly limited, but the width is the narrowest at the center in the longitudinal direction, and the left and right side edges gradually narrow from the front and rear ends toward the center. is formed as

The outer shape of the body fluid-absorbent article 1 can be any other shape, such as a stadium track (lap track) or a similar shape, an elliptical shape, a rectangular shape, etc., as long as it is vertically long. Otherwise, it can have various shapes such as square, circular, and polygonal.

The size and thickness of the bodily fluid absorbent article 1 are not particularly limited, and the size and thickness can be appropriately set according to the user's body part to be used.

The body fluid absorbent article 1 does not necessarily have a three-layer structure of the top sheet 2, the absorbent body 4 and the back sheet 3. Alternatively, a laminate structure of four or more layers may be employed, such as by providing a sheet having an effect of preventing backflow of bodily fluids to the surface side.

Top sheet The top sheet 2 is in contact with the user's skin during use, and allows the body fluid discharged to the top sheet 2 to pass through in the thickness direction and transfer the body fluid to the absorbent body 4. have The sheet structure of the top sheet 2 is not particularly limited as long as it has liquid permeability, and examples thereof include woven fabric, knitted fabric, non-woven fabric, and felt. Among these, it is preferable to use a nonwoven fabric for the top sheet 2 from the viewpoints of good touch and low irritation to the skin. The method for producing the nonwoven fabric used for the top sheet 2 is not particularly limited, and the nonwoven fabric can be produced according to conventionally known methods. It is preferable to manufacture by a method such as a method. According to these methods, the texture of the top sheet 2 is improved, and since no adhesive or solvent is used, safety to the skin can be enhanced.

The material that constitutes the top sheet 2 is not particularly limited, and examples thereof include natural fibers such as cotton, silk, pulp, wool, and hemp; Synthetic fibers such as polyethylene/polypropylene composite fibers; semi-synthetic fibers such as rayon fibers and acetate fibers; Among these, when cellulosic fibers such as cotton, rayon fibers, and acetate fibers are used as the material of the top sheet 2, they are excellent in moisture absorption, so that the moisture on the surface of the skin can be kept moderately, and the fibers themselves can absorb moisture. It has the advantage of less friction with the skin because it becomes softer and less static electricity is generated. In particular, when cotton, which is a natural fiber, is used as the cellulosic fiber, the body fluid-absorbing article 1 is gentle on the skin and excellent in comfort when used because it has a good texture and is less irritating to the skin (less likely to cause a rash). can do.

When the top sheet 2 is made of 100% cotton, the body fluid-absorbing article 1 can be more effectively made gentle to the skin and excellent in comfort during use. On the other hand, if the top sheet 2 is made of cotton and thermoplastic synthetic fibers such as polyethylene/polyester composite fibers, the body fluid absorbent article 1 is subjected to thermocompression bonding in order to form the crimped portions 8 . When applied, the thermoplastic synthetic fibers are melted to allow the top sheet 2 and the absorbent body 4 (containing thermoplastic fibers) or the back sheet 3 to be welded together. Note that the top sheet 2 in this case preferably contains 50% or more of cotton from the viewpoint of improving the gentleness when touching the skin as described above.

The top sheet 2 does not need to be composed of a single liquid-permeable sheet, and may be composed of a laminate obtained by laminating a plurality of liquid-permeable sheets. The top sheet 2 in this case is a laminate in which a sheet made of cellulosic fibers (preferably cotton) is arranged on the side that contacts the user, and a sheet made of thermoplastic synthetic fibers is arranged on the side that contacts the absorbent body 4. preferably configured.

As shown in FIG. 1, the top sheet 2 is formed with a plurality of recesses 9 on the surface side. The plurality of recesses 9 may be formed at least in the body fluid discharge main region F of the top sheet 2, but may be formed throughout the top sheet 2 as in the present embodiment. The entire area of the top sheet 2 means the entire area excluding the crimped portion 8 . The body fluid discharge main region F refers to a region facing the user's private part where body fluids are discharged during use. In the present embodiment, as indicated by the dashed line in FIG. It is said that Note that the position and size of the body fluid discharge main region F may be appropriately adjusted according to the user's site to which the body fluid absorbent article 1 is applied and how it is worn on the site, and are not particularly limited. .

Although details will be described later, the plurality of recesses 9 are formed by embossing the top sheet 2, for example. In the top sheet 2, as shown in FIG. 3, the depressions 9 are thin portions due to the pressing force applied during embossing, and body fluids can easily permeate through the depressions 9. As shown in FIG. Therefore, the bodily fluid discharged to the top sheet 2 is transferred to the absorbent body 4 mainly through the recesses 9 and is absorbed. The body fluid absorbed by the absorbent body 4 spreads radially in the surface direction of the absorbent body 4 and is held by the absorbent body 4 .

As shown in FIG. 3 , the recess 9 has a tapered shape in a vertical cross section parallel to the thickness direction of the top sheet 2 in which the width gradually narrows toward the bottom of the recess 9 . The concave portion 9 has a tapered vertical cross-sectional shape in all directions, and the cross-sectional shape gradually decreases from the opening 90 widening on the surface of the top sheet 2 toward the bottom 91 side. In this embodiment, the recess 9 has a truncated cone shape with a flat tip forming a bottom 91 .

The shape of the recess 9 in the longitudinal section is not particularly limited as long as it has a tapered shape. Further, as shown in FIG. 4A, the peripheral wall 92 may be inclined in a curved line rather than in a straight line, and as shown in FIG. You may have As described above, the shape of the concave portion 9 in the longitudinal section can be various shapes as long as it exhibits a tapered shape. Further, the recess 9 may have a hole (not shown) formed in the bottom 91 .

The concave portion 9 has a tapered shape as a whole toward the bottom 91 side, and since the cross section on the side of the opening 90 that widens on the surface of the top sheet 2 has a large shape, the concave portion 9 absorbs bodily fluid discharged to the top sheet 2 . It can be smoothly transferred to the body 4, and the absorbability of the body fluid by the absorbent body 4 can be enhanced. In addition, since the cross-sectional shape of the recess 9 adjacent to the absorbent body 4 on the side of the bottom 91 is small, the body fluid held by the absorbent body 4 does not return from the absorbent body 4 to the top sheet 2 side via the recessed part 9 . can be suppressed.

Although the depth of the recess 9 is not particularly limited, it is preferable that the recess 9 protrude beyond the thickness of the top sheet 2 toward the absorbent body 4 as shown in FIG. Since the concave portion 9 protrudes toward the absorbent body 4 , the body fluid can be transferred to the absorbent body 4 more smoothly, so that the absorbability of the body fluid by the absorbent body 4 can be further enhanced.

The shape of the recess 9 in plan view is not particularly limited, and may be circular as in the present embodiment, but may be elliptical or polygonal. The area of the concave portion 9 in a plan view (the area of the opening of the concave portion 9 that spreads on the surface of the top sheet 2, hereinafter referred to as the “opening area”) is not particularly limited, but if it is too small, the concave portion 9 may cause the absorber to While the effect of smoothly transferring body fluids to 4 is weakened, if it is too large, backflow of body fluids from the absorbent body 4 tends to occur. Therefore, the opening area of the concave portion 9 is preferably 0.2 mm ² or more and 7.1 mm ² or less, more preferably 0.4 mm ^{2 or} more and 1.8 mm ² or less.

The total opening area of the recesses 9 of the top sheet 2 is not particularly limited. The adhesive of the adhesive layer 5 for bonding the absorbent body 4 comes into contact with the skin, and the comfort during use of the body fluid absorbent article 1 is reduced. Therefore, the total opening area of the concave portions 9 of the top sheet 2 is preferably 4% or more and 10% or less as a ratio (opening area ratio) to the area of the top sheet 2 (the area of the region excluding the crimping portion 8). It is more preferable to make it 5% or more and 8% or less. The opening area ratio may be 4% or more and 10% or less, more preferably 5% or more and 8% or less, at least in the body fluid discharging main region F of the top sheet 2 .

As will be described later, by arranging a plurality of unit rows 13 in parallel with each other, the unit rows 13 are formed by repeatedly arranging the unit patterns 12 of the recesses in a direction inclined with respect to the vertical direction or the horizontal direction of the top sheet 2. When the recesses 9 are formed in the top sheet 2, the ratio of the total opening area of the recesses 9 in the unit pattern 12 to the area of the unit pattern 12 of recesses (opening area ratio) is preferably 4% or more and 10%. Below, more preferably 5% or more and 8% or less.

This open area ratio is obtained by taking a picture with a camera while placing a scale on the surface of the top sheet 2, importing the photographed image into a personal computer, and using image analysis software to analyze the entire area of the top sheet 2 (the unit pattern 12 of the recesses). area) is extracted and its area S1 is measured. The opening area ratio can be calculated by ×S2/S1.

The plurality of recesses 9 are not evenly distributed in the topsheet 2 as shown in FIG. That is, the plurality of recesses 9 are not arranged on the top sheet 2 in a state in which the recesses 9 are evenly distributed, such as in a lattice arrangement or a staggered arrangement. The plurality of recesses 9 are arranged on the top sheet 2 in a state in which several recesses 9 are gathered at a plurality of locations on the top sheet 2 . That is, the top sheet 2 includes a plurality of dense regions 10 in which a plurality of recesses 9 are densely gathered as shown in FIG. Regions 10 are distributed at intervals. A plurality of dense regions 10 sandwich a sparse region 11 , and each dense region 10 is surrounded by the sparse regions 11 . Here, the sparse region 11 refers to a region of the top sheet 2 where the recesses 9 are not formed. The number of recesses 9 included in the dense region 10 is not particularly limited, but is preferably three or more, more preferably four or more. Moreover, it is preferable that the plurality of concave portions 9 included in the dense region 10 are not gathered in a row but are evenly distributed and gathered together. The top sheet 2 may include portions other than the dense area 10 and the sparse area 11. For example, one concave portion 9 may be arranged separately from the concave portion 9 of the dense area 10.

Since a plurality of dense regions 10 exist on the top sheet 2 with the sparse regions 11 interposed therebetween, body fluid discharged to the top sheet 2 spreads in the surface direction of the top sheet 2 through the sparse regions 11. , to a plurality of dense regions 10 present in the top sheet 2 . Then, when the bodily fluid is guided to the dense region 10 , the plurality of recesses 9 densely gathered in the dense region 10 quickly migrate to the absorbent body 4 and are absorbed by the absorbent body 4 . In this way, while the body fluid discharged to the top sheet 2 is diffused over a wide range, the body fluid is rapidly transferred to the absorbent body 4 in each of the dense regions 10 in the middle of the diffusion, so that the body fluid can be spread over a wide area of the absorbent body 4. In addition, the absorbent core 4 can absorb more bodily fluids, and the return of the bodily fluids from the absorbent core 4 to the top sheet 2 can be suppressed.

In the dense area 10, a plurality of concave portions 9 are gathered at small intervals within an imaginary frame having a predetermined shape in plan view. In the present embodiment, as shown in FIG. 5, as the dense area 10, a dense area 10A in which four recesses 9 are gathered within a circular virtual frame, and a dense area 10A in which 17 recesses 9 are gathered within a circular virtual frame. Dense areas 10B1, 10B2, 10B3, and 10B4A are present in the top sheet 2, and a predetermined number of recesses 9 are evenly distributed within each dense area 10. As shown in FIG. The distance between the recesses 9 in the dense region 10 is 1.5 mm or more and 3.0 mm or less, preferably 2 mm, with respect to at least one other recess 9 located closest to the given recess 9. 0 mm or more and 2.8 mm or less.

The size of the dense area 10 is not particularly limited, but in the present embodiment, the size of the circular imaginary frame in which the plurality of recesses 9 are accommodated is set within the range of 5 mm or more and 20 mm or less in diameter. . It should be noted that the shape of the virtual frame is not necessarily circular, and may be various shapes such as elliptical and rectangular such as square and rectangle. When the virtual frame has an elliptical shape, its size is set within the range of 10 mm to 20 mm in major axis and 5 mm to 15 mm in minor axis. The size when the virtual frame is square or rectangular conforms to the size when it is circular or elliptical, respectively.

The density of the plurality of recesses 9 included in the dense region 10 is not particularly limited. However, if the size is too large, the adhesive of the adhesive layer 5 for bonding the top sheet 2 and the absorbent body 4 together will come into contact with the skin, reducing the comfort during use of the body fluid absorbent article 1 . Therefore, the density of the plurality of recesses 9 included in the dense region 10 is preferably 8% or more and 15% or less, and preferably 10% or more, in terms of the ratio of the opening area of the recesses 9 to the area of the dense region 10 (opening area ratio). It is more preferable to make it 13% or less.

The open area ratio of the recesses 9 in the dense region 10 is obtained by taking a picture with a camera while placing a scale on the surface of the top sheet 2, importing the photographed image into a personal computer, and extracting the dense region 10 using image analysis software. It is possible to measure the area S3 and to extract the openings 90 of the plurality of concave portions 9 in the dense area 10, measure the total area S4, and calculate the opening area ratio by 100×S4/S3.

In addition, in the dense region 10 of the top sheet 2 , the presence of the plurality of recesses 9 tends to reduce the adhesive strength of the adhesive layer 5 between the top sheet 2 and the absorbent body 4 . In particular, when the material of the top sheet 2 is mainly composed of hydrophilic cellulosic fibers such as cotton and rayon, when the adhesive used for the adhesive layer 5 is mainly composed of hydrophobic rubber-based hot melt, the adhesive strength is reduced. tends to decrease. However, since the sparse area 11 exists in the top sheet 10 so as to surround the dense area 10, the bonding strength of the adhesive layer 5 between the top sheet 2 and the absorbent body 4 is high in the sparse area 11. The sheet 2 can be made difficult to peel off from the absorber 4. - 特許庁In this way, the top sheet 2 has the sparse regions 11 around the individual dense regions 10 of the plurality of dense regions 10, so that the top sheet 2 maintains high durability against peeling of the top sheet 2 from the absorbent body 4. , the absorption of bodily fluids by the absorbent body 4 can be enhanced.

Although the size of the sparse area 11 is not particularly limited, it is preferably large enough to separate the dense areas 10 sandwiching the sparse area 11 from each other by an interval of, for example, 5 mm or more and 10 mm or less. The total area of the sparse regions 11 in a plan view is not particularly limited. While the effect of increasing the durability against peeling of 2 is weakened, if the density is too large, the effect of rapidly transferring body fluids by the dense region 10 to the absorbent body 4 is weakened. Therefore, the area of the sparse region 11 in a plan view is preferably 20% or more and 50% or less as a ratio (area ratio of the sparse region) to the area of the top sheet 2 (area of the region excluding the crimped portion 8). It is more preferable to make it 30% or more and 40% or less.

The area ratio of the sparse region 11 is determined by taking a picture with a camera while placing a scale on the surface of the top sheet 2, importing the photographed image into a personal computer, and extracting the body fluid discharge main region F using image analysis software. In addition to measuring the area S1, the dense area 10 in the body fluid discharge main area F and the concave portion 9 existing alone are extracted, the area S5 other than these is measured, and the opening area ratio is calculated by 100 x S5/S1. can be done.

As shown in FIG. 6, the plurality of recesses 9 of the top sheet 2 described above are formed in the top sheet 2 by arranging in parallel a plurality of unit rows 13 each formed by repeating unit patterns 12 of recesses. It is The recess unit pattern 12 is composed of one or a plurality of recesses 9, and when it is composed of a plurality of recesses 9, it is a combination of recesses forming a predetermined pattern. In the present embodiment, as shown in FIG. 7, 32 (=8×4) recesses 9 forming the eight dense regions 10A described above and 68 recesses forming the four dense regions 10B1, 10B2, 10B3, and 10B4. It is composed of a total of 110 recesses 9 of four (4×17) recesses 9 . As shown in FIG. 6 , the concave unit pattern 12 is repeatedly arranged along the vertical direction (longitudinal direction) and the horizontal direction (width direction) of the top sheet 2 , thereby forming a plurality of concave portions 9 on the top sheet 2 . is formed in

The shape of the recess unit pattern 12 is not limited to the shape of the present embodiment, and may be a shape in which a plurality of recesses 9 are combined in a simpler pattern. For example, in the present embodiment, the dense regions 10B1, 10B2, 10B3, and 10B4 have slightly different patterns of the recesses 9, but the patterns of the recesses 9 of the dense regions 10B3 and 10B4 are the same as the patterns of the recesses 9 of the dense regions 10B1 and 10B2. Alternatively, the unit pattern 12 of concave portions having a shape including four dense regions 10A and two dense regions 10B1 and 10B2 may be arranged repeatedly, or the pattern of the concave portions 9 of the dense regions 10B2, 10B3 and 10B4 may be arranged in the dense region 10B1. In the same manner as the pattern of the concave portions 9, the unit pattern 12 of concave portions having a shape including two dense regions 10A and one dense region 10B1 may be repeatedly arranged.

Although the unit pattern 12 of the recesses is not particularly limited, in the present embodiment, the unit patterns 12 are not repeatedly arranged in a direction parallel to the lateral direction forming the width direction of the top sheet 2, but are arranged in a direction inclined with respect to the lateral direction. lined up repeatedly. The inclination angle θ of the direction in which the unit patterns 12 are repeatedly arranged with respect to the lateral direction of the top sheet 2 is not particularly limited, but is preferably 1.0° or more and 5.0° or less, and 2.5°. ° or more and 3.5° or less. In this embodiment, the unit patterns 12 of the recesses are not repeatedly arranged in a direction parallel to the longitudinal direction, but are repeatedly arranged in a direction inclined with respect to the longitudinal direction, even in the longitudinal direction of the top sheet 2. . In addition, the unit patterns 12 of the concave portions may be arranged repeatedly in a direction parallel to the longitudinal direction of the top sheet 2 . Further, the concave unit patterns 12 may be repeatedly arranged in a direction parallel to the horizontal direction in the horizontal direction of the top sheet 2, and may be repeatedly arranged in a direction inclined with respect to the vertical direction in the vertical direction of the top sheet 2. good.

Backsheet The backsheet 3 prevents the body fluid absorbed by the absorbent body 4 from flowing out from the back side of the body fluid absorbent article 1, and has liquid impermeability that does not allow body fluid to permeate. The material of the back sheet 3 is not particularly limited as long as it is liquid-impermeable. For example, a liquid-impermeable film, a liquid-impermeable nonwoven fabric such as SMS, a spunbonded nonwoven fabric, or a point-bonded nonwoven fabric. For example, a liquid-impermeable film laminated on the film can be used. Examples of liquid-impermeable films include films made of polyethylene, polypropylene, polyester, nylon, polyvinyl alcohol, cellophane, vinyl chloride, etc., or multilayer films thereof.

Absorbent body The absorbent body 4 absorbs the body fluid that permeates the top sheet 2 and retains the absorbed body fluid. The material of the absorbent body 4 is not particularly limited as long as it has the ability to absorb and retain bodily fluids, and is generally used for pantyhose sheets, sanitary napkins, sweat-absorbing sheets, etc., for example, water-absorbent pulp. , known absorbent materials such as water-absorbing polymers; and sheet-structure fiber aggregates such as woven fabrics, knitted fabrics, non-woven fabrics, and pulp products. Among them, it is preferable to use a nonwoven fabric made of natural fibers and synthetic fibers because of its good texture and excellent absorbency.

Natural fibers include, for example, cotton, silk, pulp, wool, hemp, and the like. Among these natural fibers, cellulosic fibers such as cotton and pulp (which are not protein-based components) are preferable because they are less likely to cause contact dermatitis such as allergies, less likely to cause rashes, and have excellent absorbency.

Examples of synthetic fibers include nylon fibers, polyethylene fibers, polyester fibers, polyamide fibers, acrylic fibers, polyvinyl alcohol fibers, polypropylene fibers, polyethylene terephthalate fibers, ethylene vinyl acetate fibers, and urethane fibers. Rayon fibers, acetate fibers, semi-synthetic fibers such as cupra, and mixed spinning products and mixed fiber products of various fibers can also be used. Among them, synthetic fibers such as ethylene vinyl acetate fiber, polypropylene fiber, polyethylene fiber, polyester fiber, polyethylene terephthalate fiber, and composite fibers thereof are preferable from the viewpoint of dry feeling and texture. Examples of conjugated fibers include polyethylene/polyester (including polyethylene terephthalate) conjugated fibers, polyethylene/polypropylene conjugated fibers, ethylene vinyl acetate/polypropylene conjugated fibers, and the like. These may be used individually by 1 type, and may be used in combination of 2 or more type. Examples of a combination of two or more types include a combination of cellulosic fibers and composite fibers, and the blending ratio can be, for example, 4:6 to 8:2.

The manufacturing method of the nonwoven fabric used for the absorbent body 4 is not particularly limited, and it can be manufactured according to a conventionally known method. It is preferable to manufacture by a method such as a method. According to these methods, the feel of the absorbent body 4 is improved, and since no adhesive or solvent is used, the safety to the skin can be enhanced.

Adhesive layer The adhesive layers 5 and 6 are made of a water-soluble adhesive (for example, an acrylic water-soluble adhesive) or a non-water-soluble adhesive (for example, a rubber hot-melt or a polyolefin hot-melt) between the top sheet 2 and the absorbent body. 4 and between the absorbent body 4 and the backsheet 3, for example, by coating or spraying. The adhesive layers 5 and 6 may be provided on the entire surface or substantially the entire surface of the top sheet 2, the absorbent body 4, and the back sheet 3, or may be partially provided in, for example, a stripe pattern (vertical stripes, horizontal stripes), a lattice pattern, or a spiral pattern. may have been

Adhesive layer The adhesive layer 7 is formed by applying an adhesive to the back sheet 3, for example. The adhesive is not particularly limited as long as it can be used to attach the body fluid absorbent article 1 to clothing such as underwear. Adhesives such as flexible adhesives (for example, rubber-based hot-melt and polyolefin-based hot-melt) can be used. Among them, water-insoluble adhesives are preferable, and rubber-based hot melt adhesives are more preferable, because they have superior adhesive strength to clothes such as underwear compared to other adhesives.

The adhesive layer 7 may be provided on the entire or substantially the entire back surface of the back sheet 3, or may be provided partially. In this embodiment, as shown in FIG. 2, the adhesive layer 7 includes a plurality of strip-shaped adhesive portions 70 extending in the width direction of the backsheet 3 and arranged at predetermined intervals along the longitudinal direction of the backsheet 3. The adhesive layer 7 is striped.

The adhesive layer 7 is protected by being covered with a release sheet (not shown) before use. A bodily fluid absorbent article can be attached. The release sheet is formed by applying a release agent to a sheet material such as a plastic film, a fiber sheet, or paper, and the release agent side is attached to the adhesive layer 7 .

Manufacturing Method of Body Fluid Absorbent Article A manufacturing method of the body fluid absorbent article 1 described above will be described. First, with reference to FIGS. 8 to 11, a method of manufacturing a raw sheet in which strip-shaped first raw material sheets 101 that form the base of the top sheet 2 are wound up will be described. The manufacturing apparatus 110 in this manufacturing method includes a sheet supply unit 111 that supplies the first material sheet 101, a recess forming unit 112 that forms a plurality of recesses 9 in the first material sheet 101, and a first sheet in which the recesses 9 are formed. and a sheet recovery unit 113 that recovers the raw material sheet 101 .

The sheet supply unit 111 includes a supply roll 114 around which the first raw material sheet 101 is wound, and support means (not shown) that rotatably supports the supply roll 114 . The first raw material sheet 101 is unwound from the supply roll 114 by the rotation of the take-up roll 121, which will be described later, and is conveyed to the concave portion forming portion 112 with the lengthwise direction being the conveying direction.

The concave portion forming section 112 includes a pair of plate rolls 115 and 116, and a rotation drive means (not shown) that supports the pair of plate rolls 115 and 116 and rotates them in synchronization with the conveyance of the first raw material sheet 101. . A pair of plate rolls 115 and 116 are arranged so as to sandwich the first raw material sheet 101 and rotate in directions opposite to each other according to the conveying direction of the first raw material sheet 101 . The pair of plate rolls 115 and 116 form recesses 9 in the first raw material sheet 101 passing therebetween by pressing projections 117 (to be described later) from one surface side without heating the first raw material sheet 101 passing therebetween. At this time, since the protrusions 117 physically divide the fibers forming the first material sheet 101 to form the recesses 9 , the recesses 9 corresponding to the shapes of the protrusions 117 are formed in the first material sheet 101 .

As shown in FIGS. 9 and 10, a plurality of protrusions 117 are provided on the outer peripheral surface of one plate roll 115 . A plurality of protrusions 117 are provided on the outer peripheral surface of one plate roll 115 in a pattern-shaped arrangement pattern corresponding to the arrangement pattern of the plurality of recesses 9 formed in the top sheet 2 described above. That is, the unit rows 119 are formed by repeatedly arranging the unit patterns 118 of the protrusions in a direction inclined with respect to the circumferential direction of one of the plate rolls 115, and a plurality of the unit rows 119 are arranged in parallel with each other. lined up in the thickness direction of the plate roll 115), a plurality of protrusions 117 are provided on the outer peripheral surface of one of the plate rolls 115. As shown in FIG. The inclination angle θ of the direction in which the unit patterns 118 are repeatedly arranged with respect to the circumferential direction of one printing roll 115 is the inclination angle θ of the direction in which the unit patterns 12 of the concave portions of the top sheet 2 are repeatedly arranged with respect to the lateral direction of the top sheet 2 . is the same size as The projection unit pattern 118 has a pattern shape corresponding to the concave unit pattern 12 of the top sheet 2 , and is composed of a combination of a total of 110 projections 117 in this embodiment.

The protrusion 117 has a tapered shape in a longitudinal section parallel to the height direction (the direction of protruding from the outer peripheral surface of one printing roll 115), the width of which gradually narrows toward the tip side. The projection 117 has a tapered longitudinal cross-sectional shape in all directions, and in this embodiment, the projection 117 has a conical shape with a rounded tip. As a result, the concave portions 9 of the top sheet 2 formed by the projections 117 have a tapered longitudinal cross-sectional shape in all directions. The shape of the protrusion 117 is not particularly limited as long as the shape of the longitudinal section in all directions is tapered. The height of the protrusions 117 is not particularly limited, but is preferably greater than the thickness of the top sheet 2 . As a result, as shown in FIG. 3, the recesses 9 of the top sheet 2 formed by the projections 117 protrude beyond the thickness of the top sheet 2 toward the absorbent body 4 .

As shown in FIG. 9 , a plurality of recesses 120 are provided on the outer peripheral surface of the other plate roll 116 . The plurality of depressions 120 are provided on the outer peripheral surface of the other plate roll 116 in an arrangement pattern of a pattern shape corresponding to the arrangement pattern of the plurality of protrusions 117 formed on the outer peripheral surface of the one plate roll 115 . When the plate roll 116 rotates synchronously with one of the plate rolls 115, the protrusions 117 of one plate roll 115 sandwich the first raw material sheet 101 between the corresponding depressions 120 of the other plate roll 116. Get stuck in. As a result, the concave portions 9 can be firmly and firmly formed in the first raw material sheet 101, and the shape stability of the concave portions 9 can be improved.

As shown in FIG. 8 , the first raw material sheet 101 that has passed through the recess forming section 112 is conveyed to the sheet collecting section 113 . The sheet recovery unit 113 includes a take-up roll 121 and a transport driving means (not shown) that supports and rotates the take-up roll 121 to transport the first raw material sheet 101 while winding it around the take-up roll 121 . Prepare. The first raw material sheet 101 in which the plurality of recesses 9 are formed is conveyed to the take-up roll 121 and taken up. The first raw material sheet 101 in which the plurality of recesses 9 are formed is stored in the form of a rolled original sheet.

As shown in FIG. 11, the first raw material sheet 101 in which the plurality of recesses 9 are formed by the above-described method has the unit patterns 12 of the recesses arranged repeatedly in the MD direction (the length direction of the first raw material sheet 101). A plurality of configured unit rows 13 are arranged parallel to each other in the CD direction (aligned in the width direction of the first raw material sheet 101). The unit patterns 12 of the concave portions are not repeatedly arranged in a direction parallel to the MD direction, but are repeatedly arranged in a direction inclined with respect to the MD direction. The inclination angle θ of the direction in which the unit patterns 12 are repeatedly arranged with respect to the MD direction is preferably 1.0° or more and 5.0° or less, and 2.5° or more and 3.5° or less, similarly to the top sheet 2. is more preferable.

Since the unit patterns 12 of the concave portions are not repeatedly arranged in the direction parallel to the MD direction in this way, the following effects can be obtained. In other words, when the unit patterns 12 of recesses are repeatedly arranged in a direction parallel to the MD direction, the first raw material sheet 101 is wound around the take-up roll 121 so that one part of the first raw material sheet 101 in the length direction is above the other part. , the recesses 9 in one part overlap the recesses 9 in the same unit row 13 in the other part from above. If this occurs every time the first raw material sheet 101 is wound around the take-up roll 121, the concave portions 9 of each layer of the original fabric may overlap and the shape of the concave portions 9 may be lost (collapsed, deformed, etc.). In particular, when the material of the top sheet 2 is mainly composed of cellulosic fibers such as cotton, the shape stability of the top sheet 2 is poor, and this problem becomes significant.

On the other hand, if the unit patterns 12 of the recessed portions are repeatedly arranged in a direction that is inclined with respect to the MD direction, the length of the first raw material sheet 101 is reduced when the first raw material sheet 101 is wound on the take-up roll 121 . Even if one part in the width direction is stacked on top of another part, there is no possibility that the recessed part 9 in this part will overlap the recessed part 9 in the same unit row 13 in the other part from above. Therefore, when the first raw material sheet 101 is wound around the take-up roll 121 to form a raw fabric, the concave portions 9 of the layers of the first raw material sheet 101 do not overlap each other, and the shape of the concave portions 9 collapses (collapses or deforms). etc.) can be suppressed. In particular, when the material of the top sheet 2 is mainly composed of cellulosic fibers such as cotton, the shape stability of the top sheet 2 is poor. The shape of the concave portions 9 can be maintained when the raw material sheet 101 is stored in the form of the original sheet.

In this embodiment, the unit patterns 12 of the concave portions are not repeatedly arranged in the direction parallel to the CD direction, but are repeatedly arranged in the direction inclined with respect to the CD direction. Note that the unit patterns 12 of concave portions may be arranged repeatedly in a direction parallel to the CD direction.

Next, a method for manufacturing the bodily fluid absorbent article 1 will be described with reference to FIG. The manufacturing apparatus 100 in this manufacturing method includes a first raw material sheet 101 in which a plurality of recesses 9 are formed, a strip-shaped second raw material sheet 102 that forms the basis of the absorbent body 4, and a strip-shaped raw material sheet that forms the basis of the back sheet 3. A sheet supply unit 105 that supplies the third raw material sheet 103, a bonding unit 106 that bonds the raw material sheets 101, 102, and 103 together to form a strip-shaped laminated sheet 104, and the body fluid absorbent article 1 from the laminated sheet 104. A punching part 107 for punching is provided.

The sheet supply unit 105 supports and rotates the first supply roll 105A on which the first raw material sheet 101 is wound, and the first supply roll 105A to feed and convey the first raw material sheet 101 from the first supply roll 105A. A first transport drive means (not shown), a second supply roll 105B on which the second raw material sheet 102 is wound, and the second supply roll 105B are supported and rotated to transfer the second raw material sheet 102 to the second feed roll 105B. A second transport driving means (not shown) that feeds and transports from the supply roll 105B, a third supply roll 105C around which the third raw material sheet 103 is wound, and a third supply roll 105C that supports and rotates the third feed roll 105C. and a third transport driving means (not shown) for feeding and transporting the three-material sheet 103 from the third supply roll 105C. The first raw material sheet 101, the second raw material sheet 102 and the third raw material sheet 103 are synchronously conveyed from the supply rolls 105A, 105B and 105C, respectively, and conveyed to the bonding section 106 with the lengthwise direction as the conveying direction. be. For example, a hot-melt adhesive is applied to the second raw material sheet 102 and the third raw material sheet 103 using the coaters 109A and 109B during transportation.

The lamination unit 106 includes a pair of heating rolls 106A and 106B and a lamination rotation drive means (Fig. (not shown), embossing roll 106C, backup roll 106D, and embossing roll 106C and backup roll 106D, which are supported and rotated in synchronism with the conveyance of the raw material sheets 101, 102, 103 (not shown). ) and A pair of heating rolls 106A and 106B are arranged so as to sandwich the raw material sheets 101, 102 and 103, and rotate in directions opposite to each other according to the conveying direction of the raw material sheets 101, 102 and 103. As shown in FIG. The embossing roll 106C and the backup roll 106D are arranged so as to sandwich the raw material sheets 101, 102, 103, and rotate in directions opposite to each other according to the conveying direction of the raw material sheets 101, 102, 103.

The pair of heating rolls 106A and 106B heats and presses the raw material sheets 101, 102 and 103 passing therebetween, thereby bonding the raw material sheets 101, 102 and 103 to each other with a hot-melt adhesive. As a result, a strip-shaped laminated sheet 104 in which the raw material sheets 101, 102, and 103 are laminated is formed. The laminated sheet 104 is fed to the downstream embossing roll 106C and backup roll 106D.

The embossing roll 106C is provided with a plurality of embossments (not shown) corresponding to the shape of the crimped portion 8 of the body fluid absorbent article 1 on the outer peripheral surface, and the laminated sheet 104 passing between the embossing roll 106D and the backup roll 106D is embossed. A plurality of pressure-bonded portions 8 are formed in the laminated sheet 104 by thermocompression bonding. Then, the laminated sheet 104 is supplied to a punching section 107 positioned downstream.

The punching part 107 is arranged so that the laminated sheet 104 is sandwiched between a cutting roll 107A provided with a blade (not shown) corresponding to the outer shape of the bodily fluid absorbent article 1 on its outer peripheral surface and the cutting roll 107A. and a rotation drive means (not shown) that supports the cutting roll 107A and the backup roll 107B and rotates them in synchronism with the transport of the laminated sheet 104.

The cutting roll 107A punches out the laminated sheet 104 passing between the backup roll 107B and the body fluid absorbent article 1 in a shape corresponding to the outer shape of the bodily fluid absorbent article 1 with a blade, thereby separating the body fluid absorbent article 1 from the laminated sheet 104 one after another. be done. In this embodiment, the laminated sheet 104 is punched out so that the vertical direction (longitudinal direction) of the body fluid absorbent article 1 faces the CD direction (the width direction of the laminated sheet material 104). As a result, a plurality of recesses 9 are formed in the top sheet 2 of the body fluid absorbent article 1 such that the recess unit patterns 12 are repeatedly arranged in a direction inclined with respect to the lateral direction (width direction). Note that the laminated sheet 104 may be punched so that the vertical direction (longitudinal direction) of the body fluid absorbent article 1 faces the MD direction (the length direction of the laminated sheet material 104). In this case, a plurality of recesses 9 are formed in the top sheet 2 of the body fluid absorbent article 1 such that the recess unit patterns 12 are repeatedly arranged in a direction inclined with respect to the vertical direction (longitudinal direction). .

The individual separated bodily fluid absorbent articles 1 are conveyed to the next step by the conveyer 108, where the adhesive layer 6 is formed, and then individually packaged. On the other hand, the trim 122, which is a waste material of the laminated sheet 104 after the body fluid absorbent article 1 has been separated, is recovered after being wound around the cutting roll 107A.

Functions and Effects In the body fluid absorbent article 1 of the present embodiment, the opening area ratio of the concave portions 9 in the top sheet 2 is 4% or more and 10% or less. As a result, the body fluids discharged to the top sheet 2 can be smoothly transferred to the absorbent body 4 by the plurality of recesses 9, and the absorbability of the body fluids by the absorbent body 4 can be enhanced. regurgitation of bodily fluids can be suppressed. In addition, the adhesive of the adhesive layer 5 for bonding the top sheet 2 and the absorbent body 4 together can be prevented from coming into contact with the user's skin, and comfort during use of the body fluid absorbent article 1 can be enhanced. .

In addition, in the body fluid absorbent article 1 of the present embodiment, the top sheet 2 is formed with a plurality of dense regions 10 in which a plurality of recesses 9 are gathered. It is surrounded by the sparse area 11 . As a result, the bodily fluid discharged onto the top sheet 2 can be spread in the surface direction of the top sheet 2 by the sparse regions 11 and guided to the plurality of dense regions 10 dispersed in the top sheet 2 . The concave portion 9 allows the liquid to be rapidly transferred to the absorbent body 4 and absorbed by the absorbent body 4 . Therefore, body fluids discharged to the top sheet 2 can be rapidly absorbed in a wide area of the absorbent body 4, so that the absorbability of the body fluids by the absorbent body 4 can be enhanced, and the return of body fluids from the absorbent body 4 can be prevented. can be suppressed. In addition, since the sparse area 11 exists in the top sheet 10 so as to surround the dense area 10, the bonding strength of the adhesive layer 5 between the top sheet 2 and the absorbent body 4 is high in the sparse area 11. The top sheet 2 can be made difficult to peel off from the absorber 4. - 特許庁In this way, the top sheet 2 has the sparse regions 11 around the individual dense regions 10 of the plurality of dense regions 10, so that the top sheet 2 maintains high durability against peeling of the top sheet 2 from the absorbent body 4. , the absorption of bodily fluids by the absorbent body 4 can be enhanced.

Further, in the body fluid absorbent article 1 of the present embodiment, the vertical cross-section of the concave portion 9 of the top sheet 2 exhibits a tapered shape in which the width gradually narrows toward the bottom side of the concave portion 9 (toward the absorber 4 side). there is As a result, since the concave portion 9 has a large cross-sectional shape on the side of the opening 90 that widens on the surface of the top sheet 2 , bodily fluids smoothly transfer from the concave portion 9 to the absorbent body 4 . Therefore, it is possible to increase the absorption of body fluids by the absorbent body 4, reduce the amount of body fluids remaining on the top sheet 2, and prevent the body fluids from coming into contact with the user's skin. In addition, since the concave portion 9 has a small cross-sectional shape on the side of the bottom 91 adjacent to the absorbent core 4, body fluid retained by the absorbent core 4 flows back from the absorbent core 4 to the top sheet 2 side via the concave portion 9. can be suppressed.

In addition, in the body fluid absorbent article 1 of this embodiment, the concave portion 9 of the top sheet 2 protrudes toward the absorber 4 beyond the thickness of the top sheet 2 . This makes it easier for body fluid discharged to the top sheet 2 to migrate from the recesses 9 to the absorbent body 4 . Therefore, the absorbability of body fluids by the absorber 4 can be further enhanced.

In addition, in the manufacturing process of the body fluid absorbent article 1 of the present embodiment, the first raw material sheet 101 forming the base of the top sheet 2 has a unit pattern 12 of depressions in a direction inclined with respect to the length direction. A plurality of recesses 9 are formed by arranging a plurality of unit rows 13 in parallel with each other. As a result, when the first raw material sheet 101 having the plurality of recesses 9 formed thereon is wound around the take-up roll 121 and collected, the recesses 9 do not overlap in the wound layers of the first raw material sheet 101 . Therefore, when the first raw material sheet 101 is wound around the take-up roll 121 and collected, it is possible to prevent the shape of the concave portion 9 from collapsing (crushing, deforming, etc.). In particular, when the material of the top sheet 2 is mainly composed of cellulosic fibers such as cotton, the shape stability of the top sheet 2 is inferior. Since the shape of the recesses 9 can be maintained when the sheet 101 is stored in the form of a raw sheet, the plurality of recesses formed in the top sheet 2 can be maintained even in the body fluid absorbent article 1 manufactured using the first raw material sheet 101. 9 shape is retained.

Modifications Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the gist of the present invention.

In the above-described embodiments, the recesses 9 project beyond the thickness of the topsheet 2 toward the absorbent body 4, as shown in FIG. As a modified example, the concave portion 9 may be recessed from the front side within the thickness of the top sheet 2 and may not protrude from the back side toward the absorbent body 4 .

In the above-described embodiment, as shown in FIG. 3, the concave portion 9 has a tapered shape in a longitudinal section parallel to the thickness direction of the top sheet 2 in which the width gradually narrows toward the bottom side of the concave portion 9. presenting. As a modified example, the concave portion 9 does not have a tapered shape in a longitudinal section parallel to the thickness direction of the top sheet 2, but has a constant width from the opening 90 side to the bottom side 91. good.

In the above-described embodiment, as shown in FIG. 5, the top sheet 2 is formed with a plurality of dense regions 10 in which a plurality of recesses 9 are densely gathered. As a modified example, the recesses 9 may be dispersedly arranged in the top sheet 2 without being densely gathered.

In the above-described embodiment, as shown in FIG. 6, in the top sheet 2, unit rows 13 are formed by repeatedly arranging unit patterns 12 of recesses in a direction inclined with respect to the vertical or horizontal direction of the top sheet. A plurality of recesses 9 are formed by arranging a plurality of unit rows 13 parallel to each other. As a modified example, the unit patterns 12 of recesses may be arranged repeatedly in a direction parallel to the longitudinal direction of the top sheet 2 and may be arranged repeatedly in a direction parallel to the lateral direction of the top sheet 2 .

In the above-described embodiment, the body fluid-absorbing article 1 is a pantyhose sheet, but as a modification, the body fluid-absorbing article 1 may be a sanitary napkin, an incontinence pad, an armpit sweat pad, a sweat absorbing sheet, or other type of body fluid. It can be made for absorption.

The present invention will be described in more detail below based on examples. In addition, the contents of the present invention are not limited to the following examples.

In order to confirm the effect of the opening area ratio of the concave portions of the top sheet of the body fluid-absorbing article, a test was conducted on the absorbability of body fluid by the absorbent body and the regurgitation property of the body fluid from the absorbent body. The bodily fluid absorbent articles used in Examples 1 to 3 and Comparative Examples 1 to 4 were laminated with a top sheet measuring 15 cm long and 5 cm wide, an absorbent body, and a back sheet. And the materials of the back sheet are as follows. Table 1 shows the opening area ratios of the recesses in the top sheets of Examples 1 to 3 and Comparative Examples 1 to 4.
・Surface sheet: Spunlace nonwoven fabric (same for all examples)
・Absorbent: Air-through non-woven fabric (same for all examples)
- Backsheet: Polyethylene film (same for all examples)

As for the contents of the test, first, 0.5 mL of an aqueous mucin solution having a concentration of 0.62% is dropped from the top sheet and left for 5 minutes. After 5 minutes, 10 sheets of filter paper each having a size of 7.5 cm long and 7.5 cm wide are superimposed on the top sheet and allowed to stand in this state for 1 minute. After 1 minute, remove the 10 filter papers on the topsheet and weigh the 10 filter papers. The amount of change in weight M before and after placing the filter paper on the body fluid absorbent article was calculated, and the proportion of the aqueous mucin solution transferred from the body fluid absorbent article to the filter paper (100×M/0.5) was calculated. The specific gravity of the aqueous mucin solution was set to 1. Table 1 shows the results. In addition, when 10 pieces of filter paper are placed on the top sheet and allowed to stand for 1 minute, a weight of 378 g is placed on the filter paper, and the weight of the 10 pieces of filter paper after standing for 1 minute in this state is also calculated. In the same manner, the proportion of aqueous mucin solution transferred from the body fluid absorbent article to the filter paper (100×M/0.5) was calculated. Table 1 shows the results.

According to Table 1, when the opening area ratio of the recesses in the top sheet is 4% or more, the absorbability of the body fluid discharged to the top sheet sheet by the absorber is excellent, and the return of body fluid from the absorber is effectively prevented. It was confirmed that it is possible to prevent Therefore, it can be seen that the top sheet is less sticky to the skin when the body fluid absorbent article is used, and the comfort during use can be improved.

REFERENCE SIGNS LIST 1 bodily fluid absorbing article 2 top sheet 3 back sheet 4 absorber 9 recess 10 dense region 11 sparse region 12 unit pattern of recess 13 unit row of unit pattern

Claims (5)

A body fluid comprising a top sheet, a back sheet, and an absorbent body disposed between the top sheet and the back sheet, wherein the absorbent body absorbs body fluid that permeates through the top sheet on the side that contacts the user's skin. An absorbent article,
A plurality of recesses are formed in the top sheet by repeatedly arranging unit patterns of recesses recessed toward the absorbent body in the longitudinal direction and the lateral direction of the top sheet,
A bodily fluid-absorbing article, wherein the top sheet has an open area ratio of the recesses of 4% or more and 10% or less. 2. The bodily fluid absorbency according to claim 1, wherein a plurality of unit rows are arranged parallel to each other, each unit row being formed by repeatedly arranging the unit pattern of the recesses in a direction inclined with respect to the longitudinal direction or the lateral direction of the top sheet. Goods. The top sheet has a vertically long shape whose length in the vertical direction is longer than the length in the horizontal direction,
3. The body fluid-absorbing article according to claim 1, wherein the unit pattern of the recesses is repeatedly arranged in a direction inclined with respect to the lateral direction. The top sheet has a vertically long shape whose length in the vertical direction is longer than the length in the horizontal direction,
The bodily fluid-absorbing article according to any one of claims 1 to 3, wherein the unit pattern of the recesses is repeatedly arranged in a direction inclined with respect to the longitudinal direction. 5. The top sheet according to any one of claims 1 to 4, wherein the top sheet has a plurality of dense regions in which a plurality of the recesses are gathered, and each of the plurality of dense regions is surrounded by a sparse region in which the recesses are not formed. The bodily fluid absorbent article according to any one of .

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