CN220175388U - Disposable absorbent article - Google Patents

Abstract

The present utility model provides a disposable absorbent article comprising a liquid permeable topsheet, a liquid impermeable backsheet, an absorbent member positioned between the topsheet and the backsheet, and a liquid distribution member (20) positioned between the topsheet and the absorbent member; the liquid distribution member comprises a three-dimensional upper layer having a first plurality of apertures (39), a sub-layer having fibers, and a second plurality of openings (29) through the three-dimensional upper layer and the sub-layer in thickness, the second plurality of openings having an average area greater than six times the first plurality of apertures. The liquid gushes can quickly pass through the absorbent member at the second plurality of openings, thereby reducing the risk of side leakage. The absorbent article provides improved comfort and performance.

Description

Disposable absorbent article

Technical Field

The present utility model relates to a disposable absorbent article.

Background

Disposable absorbent articles typically comprise a liquid permeable topsheet, a liquid impermeable backsheet, and an absorbent core layer disposed therebetween, such as a pant diaper, a urine absorbent pad, a panty liner, a sanitary napkin, or the like. Disposable absorbent articles are designed to fit comfortably in the excretory region of the wearer to absorb and contain bodily exudates.

The prior art CN1198555C discloses a sanitary napkin having a large number of minute apertures in the topsheet. The prior art CN101754734B discloses a sanitary napkin, the top sheet of which has a first hole and a second hole.

Disclosure of Invention

It is an object of the present utility model to provide an absorbent article to provide improved comfort and performance.

To this end, the present utility model provides a disposable absorbent article comprising a liquid permeable topsheet, a liquid impermeable backsheet, an absorbent member positioned between said topsheet and backsheet, and a liquid distribution member positioned between said topsheet and absorbent member; the liquid distribution member includes a three-dimensional upper layer having a first plurality of apertures, a sublayer having fibers, and a second plurality of openings through the three-dimensional upper layer and the sublayer in thickness, the second plurality of openings having an average area that is greater than six times the average area of the first plurality of apertures. The first plurality of holes may have, in part, different shapes or areas, preferably a ratio of maximum area to minimum area of individual holes not exceeding 2. The second plurality of openings may have, in part, different shapes or areas, preferably a ratio of a maximum area to a minimum area of a single opening is not more than 2. When liquid discharged from the wearer's discharge orifice, such as but not limited to menstrual blood, urine, gushes out, the absorbent member can be quickly reached through the second plurality of openings, thereby reducing the risk of side leakage caused by the gushed liquid flowing around the upper surface of the liquid distribution member.

In an alternative embodiment of the disposable absorbent article, the average area of the second plurality of openings is seven times or more the average area of the first plurality of apertures. In an alternative embodiment of the disposable absorbent article, the average area of the second plurality of openings is more than eight times the average area of the first plurality of apertures.

In an alternative embodiment of the disposable absorbent article, the individual area of the first plurality of apertures is between 0.1 and 1 square millimeters, more preferably between 0.2 and 0.8 square millimeters. In an alternative embodiment of the disposable absorbent article, the individual area of the second plurality of openings is between 3 and 20 square millimeters, more preferably between 4 and 13 square millimeters, and more preferably between 5 and 9 square millimeters.

In an alternative embodiment of the disposable absorbent article, the shape of the second plurality of openings is selected from the group consisting of circles, ovals, polygons, such as, but not limited to, triangles, squares, diamonds, slits.

In an alternative embodiment of the disposable absorbent article, the three-dimensional upper layer is selected from the group consisting of a three-dimensional film, a three-dimensional nonwoven fabric structure, a three-dimensional paper structure, a hollow double-walled fabric. Optionally, the first plurality of holes in the three-dimensional film, the three-dimensional nonwoven structure, the three-dimensional paper structure are formed by piercing, have a microscopic funnel shape, and facilitate the passage of liquid from the funnel without facilitating reverse osmosis. Optionally, the first plurality of apertures in the hollow double-walled fabric are formed by weaving.

In an alternative embodiment of the disposable absorbent article, the three-dimensional nonwoven structure comprises a three-dimensional first nonwoven layer and a planar second nonwoven layer, the first nonwoven layer comprising raised areas and recessed areas, the first nonwoven layer being composited with the second nonwoven layer in the recessed areas, the first plurality of apertures being located in the recessed areas.

In an alternative embodiment of the disposable absorbent article, the second nonwoven layer is more hydrophilic than the three-dimensional first nonwoven layer and the fibrous sub-layer is more hydrophilic than the second nonwoven layer. The hydrophilic gradient thus provided makes it more likely that liquid excreted by the wearer will be conducted to the absorbent member and will be difficult to reverse penetrate from the absorbent member to the topsheet, thereby keeping the topsheet dry and comfortable for the wearer in use.

In an alternative embodiment of the disposable absorbent article, the raised areas are in the form of a grid and the recessed areas have an area ratio of between 50% and 75%. The grid-like raised areas help to reduce the risk of liquid flowing around the upper surface of the liquid distribution member causing side leakage. In an alternative embodiment, the area of the recessed region is between 35 and 60 square millimeters and the number of the first plurality of apertures is between 10 and 20 in each mesh of the three-dimensional first nonwoven layer; or the area of the recessed region is between 50 and 120 square millimeters, and the number of the first plurality of holes is between 20 and 30.

In an alternative embodiment of the disposable absorbent article, the liquid distribution member comprises a front portion, a central portion, a rear portion, and the second plurality of openings are located in the central portion. Optionally, the second plurality of openings comprises less than 20% of the area of the liquid distribution member in the middle.

In an alternative embodiment of the disposable absorbent article, a transition zone is provided between the front portion and the central portion, the width of which decreases towards the middle, and the rear portion has wedge-shaped slits symmetrically arranged along the longitudinal central axis of the article, said slits forming an angle of between 15 ° and 40 °.

In an alternative embodiment of the disposable absorbent article, the absorbent member comprises a first absorbent body adjacent to the liquid distribution member and a second absorbent body adjacent to the backsheet, the second absorbent body being made of a blend of wood pulp fibers and superabsorbent material.

In an alternative embodiment of the disposable absorbent article, the first absorbent body comprises a nonwoven substrate on the side adjacent to the liquid distribution member and a mixture of polymer fibers and wood pulp fibers on the side adjacent to the second absorbent body, and a gradient in which the specific gravity of the wood pulp fibers in the mixture gradually increases is formed in a direction from the top sheet toward the bottom sheet. The nonwoven substrate and the polymer fibers have good liquid conductivity, while the wood pulp fibers have good liquid storage capacity, so that the first absorbent body has both liquid conductivity and liquid storage capacity in its plane, and the gradient of liquid storage capacity formed in its thickness direction is favorable for moving liquid in the direction from the top sheet toward the bottom sheet.

In an alternative embodiment of the disposable absorbent article, a hydrophilic nonwoven layer is further provided between the absorbent member and the backsheet. In an alternative embodiment of the disposable absorbent article, the absorbent member has a hydrophilic nonwoven cover. A hydrophilic nonwoven layer such as, but not limited to, a spunlaced nonwoven in direct contact with the backsheet, wherein the wetting of the nonwoven layer by the liquid removed by the wearer can be visually observed through the backsheet, thereby increasing the perception of the absorbent capacity of the article by the wearer.

The present utility model provides a disposable absorbent article comprising a liquid permeable topsheet, a liquid impermeable backsheet, an absorbent member positioned between the topsheet and the backsheet, and a three-dimensional liquid distribution member positioned between the topsheet and the absorbent member; the liquid distribution part comprises a front part, a middle part and a rear part, wherein a transition area with the width reduced to the middle is arranged between the front part and the middle part, the rear part is provided with wedge-shaped notches symmetrically arranged along the longitudinal central axis of the article, and the notches form an included angle between 15 degrees and 40 degrees.

In an alternative embodiment of the disposable absorbent article, the three-dimensional liquid distribution member comprises a hollow double-walled fabric.

Drawings

Other features and advantages of the present utility model will be better understood from the following detailed description of the preferred embodiments taken in conjunction with the accompanying drawings, in which like reference characters designate the same or similar parts throughout the figures thereof. It is to be understood that the drawings are not solely for the purposes of illustration and as a definition of the limits of the utility model, for which reference should be made.

FIG. 1 is an exploded schematic view of a sanitary napkin 10;

FIG. 2 is a schematic plan view of the liquid distribution member 20 in the sanitary napkin 10;

FIG. 3A is a schematic cross-sectional view of the liquid distribution member 20 in the sanitary napkin 10;

FIG. 3B is a top view of the materials used in the three-dimensional nonwoven structure 31 of the sanitary napkin 10;

fig. 4A to 4C are schematic views of other materials suitable for the three-dimensional nonwoven fabric structure 31;

FIGS. 5A and 5B are schematic illustrations of the outline of the liquid dispensing components 20a, 20B in two other embodiments;

fig. 6 is an exploded view of a sanitary napkin 100 according to another embodiment of the present utility model.

Detailed Description

The making and using of the embodiments are discussed in detail below. It should be understood, however, that the detailed description and the specific examples, while indicating specific ways of making and using the utility model, are given by way of illustration only and are not intended to limit the scope of the utility model.

In this specification, the directional expressions "upper", "lower", "top", "bottom", etc. are not absolute, but relative, in describing the structural positions of the respective components. These directional expressions are appropriate when the various components are arranged as shown in the figures, but should be changed as the position of the various components in the figures changes.

It will be understood that the "width" direction, "transverse" and X-direction in the drawings herein correspond to each other, the "length" direction, "longitudinal" and Y-direction in the drawings correspond to each other, and the "thickness" direction and Z-direction in the drawings correspond to each other. The "skin side" or "inner side" refers to the side that faces or is closer to the skin surface of the wearer in the thickness direction when the absorbent article is worn, and the "non-skin side" or "garment side" refers to the side of the absorbent article that faces away from the skin or the outer side of the wearer when the absorbent article is worn.

As used herein, the term "hydrophilic" refers herein to fibers or fiber surfaces that are wetted by an aqueous liquid that contacts the fibers. The degree of wetting of a material can in turn be described in terms of the contact angle and surface tension of the liquid and material involved. In general, fibers having contact angles less than 90 ° are considered "wettable" or hydrophilic, and fibers having contact angles greater than 90 ° are considered "non-wettable" or hydrophobic.

As used herein, the term "liquid impermeable" refers herein to a layer or layers of a laminate in which, upon liquid contact, liquid bodily exudates, such as urine, do not pass through the layer or laminate under ordinary use conditions in a direction generally perpendicular to the plane of the layer or laminate.

As used herein, the term "liquid permeable" refers herein to any material that is not liquid impermeable.

As used herein, the term "superabsorbent material" refers herein to a water-swellable, water-insoluble organic or inorganic material capable of absorbing at least about 15 times, in embodiments at least about 30 times its weight in an aqueous solution containing 0.9% by weight sodium chloride under most favorable conditions. Superabsorbent materials can be natural, synthetic, and modified natural polymers and materials. Furthermore, the superabsorbent materials can be inorganic materials, such as silica gels, or organic compounds, such as crosslinked polymers.

As used herein, the terms "nonwoven", "nonwoven web" and "nonwoven web" refer to a web having a structure of individual fibers or threads which are interlaid, but not in a repeating pattern as in a woven fabric or knitted fabric. Nonwoven webs or fabrics can be formed from many known processes such as, for example, air-laid processes, melt-blown processes, spunbond processes, hydroentangled processes, spunlaced processes, and bonded carded processes. In addition, multiple layers of webs, such as spunbond-meltblown-spunbond webs made by a multiple beam spunbond process, and the like, may also be used.

The sanitary napkin 10 shown in figure 1 includes a liquid permeable topsheet 11, a liquid distribution member 20, an absorbent member 40, and a liquid impermeable backsheet 12. The liquid distribution member 20 comprises a three-dimensional nonwoven structure 31 as an upper layer, a nonwoven fibrous layer 32 as a sub-layer.

As shown in fig. 2, the liquid distribution member 20 comprises a front portion 21, a middle portion 22, and a rear portion 23. In the central portion 22 there are a plurality of openings 29 penetrating the three-dimensional nonwoven structure 31 and the nonwoven fibrous layer 32. A transition 24 is provided between the front portion 21 and the central portion 22, which tapers in width towards the middle, and the rear portion 23 has wedge-shaped cutouts 25 which are arranged symmetrically with respect to the longitudinal central axis of the sanitary towel 10, the cutouts 25 forming an angle of about 30 °. The opening 29 is circular in shape and uniform in size and has an area of about 5.4 to 7 square millimeters. Preferably, the opening 29 is formed by punching and removing the material of the opening area. The liquid distribution member 20 is in a planar condition prior to use of the product, with the ratio of the longitudinal lengths of the front portion 21, the middle portion 22, and the rear portion 23 being about 1.6:2.8:1. The central portion 22 is generally aligned with the lower body discharge opening of the wearer, the front portion 21 extends at least partially within the front 1/3 length of the sanitary napkin 10, and the rear portion 23 extends at least partially within the rear 1/3 length of the sanitary napkin 10.

The width of the transition zone 24 is adapted to the distance between the muscle tendons (musculature) on both sides of the crotch of the wearer in the groin of the wearer, which is approximately 16-44 mm. The sanitary napkin 10 has a mass distribution that varies per unit length along its longitudinal direction, and as a result, the sanitary napkin 10 is more prone to crease in the lateral direction along a predetermined location, such as the transition 24, when it is fitted to a wearer. When the sanitary napkin 10 is in place, it is natural for the wearer to use the transition zone 24 to position it in the proper position on the body, i.e., over the muscle tendons. The product can then be automatically bent at said predetermined position, which, of course, is selected to obtain an optimal adaptation of the product to the human body.

The slits 25 extend from the end edges of the liquid distribution member 20 in the crotch direction, as a result of which the sanitary towel 10 can be folded along the slits and the longitudinal lines in these parts. The cut 25 is important for the adaptability and softness of the product with respect to the body, and the folds in the cut can be inserted into the seams of the wearer and in this way can provide a very good protection against leakage of liquid through the seams, which often occurs during use of conventional products when the wearer is lying down. The cut-out 25 also enables the legs 26, 27 on the liquid distribution member 20 to be displaced vertically relative to each other during different body movements, such as when the wearer walks.

FIG. 3A is a schematic cross-sectional view of the liquid distribution member 20 in the sanitary napkin 10; fig. 3B is a top view of the materials used for the three-dimensional nonwoven structure 31 in the sanitary napkin 10. For simplicity, both the possible holes 39 and openings 29 are not shown in fig. 3A. The three-dimensional nonwoven structure 31 comprises a three-dimensional nonwoven layer 33 and a flat nonwoven layer 34 that are closer to the topsheet 11. The three-dimensional nonwoven layer 33 includes raised regions 35 and recessed regions 36. As shown in FIG. 2, the raised areas 35 are staggered in a plurality of undulations extending longitudinally of the product, forming a generally diamond-shaped grid with the longer diagonal of the diamond-shaped grid being generally parallel to the longitudinal direction of the product. The recessed areas 36 are substantially flat and occupy about 70% of the area of the three-dimensional nonwoven layer 33. The three-dimensional nonwoven layer 33 is combined with the flat nonwoven layer 34 in its recessed areas 36 by, for example, but not limited to, bonding, ultrasonic welding, thermal compression. In the recessed areas 36, a plurality of apertures 39 are provided, through which apertures 39 liquid discharged by the wearer can reach the nonwoven fibrous layer 32. The apertures 39 are formed, for example and without limitation, by piercing from the three-dimensional nonwoven layer 33 toward the flat nonwoven layer 34, have a microscopic funnel shape, facilitating the passage of liquid through the apertures 39 in the direction from the three-dimensional nonwoven layer 33 toward the flat nonwoven layer 34, and not facilitating the reverse osmosis of liquid in the opposite direction. The area of the holes 39 is between 0.2 and 0.8 square millimeters. The area of the recessed area 36 is between 40 and 50 square millimeters and the number of holes 39 is between 14 and 16 in each grid.

The non-woven fibrous layer 32 is generally lofty and facilitates liquid conduction by capillary effects. The three-dimensional nonwoven fabric layer 33, the flat nonwoven fabric layer 34, and the nonwoven fabric fiber layer 32 are all hydrophilic, and the hydrophilicity thereof exhibits a step from weak to strong. Thus, liquids excreted by the wearer, such as, but not limited to, menstrual blood, urine, are more readily conducted to the absorbent member 40 and are more difficult to reverse penetrate from the absorbent member 40 to the topsheet 11, thereby maintaining dryness of the topsheet 11 and making it more comfortable for the wearer to use.

The raised areas 35 of the three-dimensional nonwoven layer 33 form cavities with the flat nonwoven layer 34. The raised areas 35 are in contact with the topsheet 11 and the recessed areas 36 form cavities with the topsheet 11. These cavities form an air cushion when the liquid is sufficiently absorbed by the absorbent member 40, providing a more comfortable experience for the wearer. The grid-like raised areas 35 slow down the flow of liquid around the plane of the three-dimensional nonwoven structure 31, thereby reducing the risk of side leakage. When liquid discharged from the wearer's discharge orifice, such as but not limited to menstrual blood, urine, gushes out, it is able to quickly reach the absorbent member 40 through the opening 29, thereby reducing the risk of the gushing liquid flowing around the upper surface of the liquid distribution member 20 causing side leakage.

The absorbent member 40 includes a first absorbent 41 and a second absorbent 42. The first absorbent 41 comprises a nonwoven substrate, such as but not limited to a nonwoven selected from hot air (hot air-through), adjacent to the liquid distribution member 20. On the side of the first absorbent body 41 adjacent to the second absorbent body 42 is a mixture of polymer fibers and wood pulp fibers (pulp), and a gradient in which the specific gravity of the wood pulp fibers in the mixture gradually increases is formed along the direction from the top sheet 11 toward the bottom sheet 12. The nonwoven substrate and the polymer fibers have good liquid conductivity, while the wood pulp fibers have good liquid storage capacity, so that the first absorbent body 41 has both liquid conductivity and liquid storage capacity in its plane, and the liquid storage capacity gradient formed in its thickness direction is advantageous for moving the liquid in the direction from the top sheet 11 toward the bottom sheet 12. The first absorbent 41 is made, for example, but not limited to, by depositing a mixture of polymer fibers and wood pulp fibers on a nonwoven substrate using an airlaid process. The secondary absorbent body 42 is a single layer cut from, for example, but not limited to, a sheet made from a blend of wood pulp fibers and superabsorbent material. The second absorbent 42 has a mass per unit area such as, but not limited to, in the range of 80-180gsm (grams per square meter), or in the range of 100-160gsm, or in the range of 120-150 gsm. The specific gravity of the superabsorbent material in the second absorbent body 42 is, for example, but not limited to, in the range of 40% -65%.

The sanitary napkin 10 may also include several other components not shown in the figures, such as, but not limited to, side leakage prevention erectable barriers, and the like.

Fig. 4A to 4C show some other materials suitable for the three-dimensional non-woven structure 31. In the material shown in fig. 4A, the raised regions 35a have a shape similar to the raised regions 35 in fig. 2, while each individual diamond-shaped recessed region 36a has a larger area and a greater number of holes than the diamond-shaped recessed region 36 in fig. 2. The raised areas 35B of the material shown in fig. 4B are also latticed to help slow the lateral flow of liquid. In the material shown in fig. 4C, the raised areas 35C are in a block-like, discrete layout.

Fig. 5A and 5B are schematic outline views of liquid distributing members 20a, 20B in other two embodiments. In the embodiment shown in fig. 5A, the liquid distribution member 20a has an oblong shape with a major axis parallel to the length direction of the product, and a plurality of openings 29a extending through the thickness of the liquid distribution member 20a have an oblong shape. In the embodiment shown in fig. 5B, the liquid dispensing member 20B is rectangular in shape with its long side parallel to the longitudinal direction of the product and a plurality of openings 29B extending through the thickness of the liquid dispensing member 20B are diamond-shaped.

The sanitary napkin 100 according to another embodiment as shown in fig. 6 comprises a liquid permeable topsheet 101, a liquid distribution member 120, an absorbent member 140 and a liquid impermeable backsheet 102. The contour of the liquid dispensing member 120 is the same as the contour of the liquid dispensing member 20 shown in fig. 2. The material of the liquid distribution member 120 is selected from, for example, but not limited to, hollow double-walled fabrics.

While the foregoing has described the technical content and features of the present utility model, it will be appreciated that those skilled in the art, upon attaining the teachings of the present utility model, may make variations and improvements to the concepts disclosed herein, which fall within the scope of the present utility model. Although only an embodiment of a sanitary napkin is shown in connection with the accompanying drawings, this is not limiting. The present utility model also encompasses any type of disposable absorbent article suitable for fitting the skin of a wearer to absorb and contain body exudates, such as infant diapers, panty liners, panty-type sanitary napkins and the like.

The above description of embodiments is illustrative and not restrictive, and the scope of the utility model is defined by the claims.

Claims (11)

1. A disposable absorbent article comprising a liquid permeable topsheet, a liquid impermeable backsheet, an absorbent member positioned between said topsheet and backsheet, and a liquid distribution member positioned between said topsheet and absorbent member;

wherein the liquid distribution member comprises a three-dimensional upper layer having a first plurality of apertures, a sub-layer having fibers, and a second plurality of openings through the three-dimensional upper layer and the sub-layer in thickness, the second plurality of openings having an average area greater than six times the first plurality of apertures.

2. The disposable absorbent article of claim 1, wherein the first plurality of apertures has an area between 0.1 and 1 square millimeter and the second plurality of openings has an area between 3 and 20 square millimeters.

3. The disposable absorbent article of claim 1, wherein the shape of the second plurality of openings is selected from the group consisting of circles, ovals, triangles, squares, and diamonds.

4. The disposable absorbent article of claim 1, wherein the second plurality of openings are slits.

5. The disposable absorbent article of claim 1 wherein the three-dimensional upper layer is selected from the group consisting of three-dimensional films, three-dimensional nonwoven structures, three-dimensional paper structures, hollow double-walled fabrics.

6. The disposable absorbent article of claim 5, wherein the three-dimensional nonwoven structure comprises a three-dimensional first nonwoven layer and a planar second nonwoven layer, the first nonwoven layer comprising raised areas and recessed areas, the first nonwoven layer being composited with the second nonwoven layer in the recessed areas, the first plurality of apertures being located in the recessed areas.

7. The disposable absorbent article of claim 6 wherein said raised areas are in the form of a grid and said recessed areas have an area ratio of between 50% and 75%.

8. The disposable absorbent article of any of claims 1-7, wherein said liquid distribution member comprises a front portion, a middle portion, a rear portion, said second plurality of openings being located in said middle portion.

9. The disposable absorbent article of claim 8 wherein a transition zone is provided between the front and middle portions that tapers in width toward the middle, the rear portion having wedge-shaped cuts symmetrically disposed along the longitudinal central axis of the article, the cuts forming an included angle of between 15 ° and 40 °.

10. The disposable absorbent article of any of claims 1-7, wherein said absorbent member comprises a first absorbent adjacent to said liquid distribution member and a second absorbent adjacent to said backsheet.

11. The disposable absorbent article of claim 10 wherein said first absorbent comprises a nonwoven substrate adjacent to a side of said liquid distribution member.