CN1130179C - Sanitary napkin having barrier means to restrict lateral migration of body fluids - Google Patents

Abstract

A sanitary napkin is provided with barrier means for preventing lateral leakage of body fluids. The barrier means may be attached to a sanitary napkin which is provided with flaps and which includes an end edge in the absorbent core which lies within the periphery of the absorbent core during use of the sanitary napkin. The barrier means may also be added to a tabbed sanitary napkin and may be formed as an integral part of the topsheet of the sanitary napkin, or as a separate strip of material.

Description

Sanitary napkins with barriers restricting lateral flow of bodily fluids

The present invention relates to a sanitary napkin, comprising

- an absorbent core having a first side, a second side and a periphery comprising two longitudinal sides and two transverse sides,

- a liquid permeable topsheet overlying the first face of said core,

- a liquid-tight backsheet connected to said topsheet, said backsheet overlying the second side of said core, and

- barrier means arranged along said longitudinal sides for restricting the flow of liquid in a direction generally parallel to said transverse sides.

Such a sanitary napkin is known from British patent application GB2168253.

In this patent application, said blocking means are arranged outside the periphery of said core and are constituted by elastic vertical portions of said topsheet and said backsheet. Although the use of the barrier means reduces lateral liquid flow, the rate of absorption of liquid enclosed between the barrier means and the core may be reduced. Such known sanitary napkins are also subject to positional changes during use.

It is an object of the present invention to provide a barrier means in a sanitary napkin which is comfortable to use and which effectively restrains the lateral escape of body fluids while at the same time ensuring adequate absorption.

Another object of the present invention is to provide a sanitary napkin which can be reliably positioned relative to the underpants of the user.

According to the present invention there is provided a sanitary napkin comprising: a) a central absorbent pad having a body contacting surface, a periphery comprising two longitudinal sides and two transverse sides, the central absorbent pad comprising: a topsheet , a liquid-impermeable backsheet joined together with said topsheet, and an absorbent core positioned between said topsheet and said backsheet; b) disposed along said longitudinal side inside or outside for confining liquid barrier means for flow in parallel lateral side directions, each said barrier means comprising a wall having a free edge raised above the plane of said central absorbent pad; and c) wings attached to the underpants, The flaps extend outwardly from each longitudinal side of the central absorbent pad.

By arranging said barrier means so that at least said free edge is on top of said absorbent core during use rather than inside it, liquids which are blocked by said barrier means from spilling laterally along said topsheet are easily Absorbed by the core.

Another absorbent article according to the invention is characterized in that said backsheet extends beyond the periphery of said core to form wings for attachment to an underpants in use, said blocking means comprising a The perimeter of the core adjoins the walls of the flaps.

The flaps may be folded up around the edge of the wearer's panties as disclosed in US-A-4687478, which is hereby incorporated by reference. It has been found that the flaps in combination with said blocking means reduce the lateral run-off of bodily fluids. Said barrier means may consist of a liquid-tight wall, or of an absorbent strip attached to said wings, said absorbent strip being attached to the wings, for example by gluing or welding. . The free edges of the walls are preferably located within the periphery of the core during use of the sanitary napkin to effectively absorb body fluids retained by the walls. However, it is also possible that the free edge of the wall is arranged outside the periphery of the core, or, for example, when using a shaped core, only part of the core is located for wider cores. within the perimeter.

An embodiment of the absorbent article according to the invention is characterized in that said wall is constituted by a spacer element located between said topsheet and said backsheet.

The spacer element may consist of a cantilever of flexible material placed between the topsheet and the backsheet outside the perimeter of the core and pushing the topsheet upwards. During use of the sanitary napkin, the sanitary napkin is compressed in the transverse side direction and the topsheet is held up by the cantilever. The free edge preferably formed by the topsheet and the cantilever is preferably compressed within the periphery of the core during use of the sanitary napkin in order to better absorb body fluids retained by the cantilever.

Said barrier means also comprises a strip of foam which is bonded or said to be attached between said topsheet and said core or on top of said topsheet.

Another embodiment of the absorbent article according to the invention is characterized in that said barrier means are constituted by said top sheet having a central part superimposed on said core and extending along the longitudinal direction of said core. The sides form edge portions of the wall.

Even though the topsheet is liquid permeable, the barrier means still creates a restriction to the lateral run-off of bodily fluids. The use of the topsheet forming the wall reduces the need for separate barrier means and thus keeps the number of parts used in the sanitary napkin low, which is welcome during production. Said blocking means may extend along the entire periphery of said core, which also prevents leakage of liquid in the general direction of the longitudinal sides.

The free edge of described blocking device is preferably tightened before use, thereby is subjected to stretching during use and throws off top sheet and is in erect upward state. This tightening can be achieved by using an elastic element in its pretensioned state along the free edge of the barrier. The free edge of said barrier means may be formed by said topsheet or said backsheet or a combination of both, which free edge may also be shortened and wrinkled by heating. Shortening the free edge in this manner also causes the sanitary napkin to be stretched longitudinally to erect upwardly during use.

Some embodiments of the sanitary napkin according to the present invention will be described in more detail with reference to the accompanying drawings. In these drawings:

Fig. 1 is the plan view of sanitary napkin of the present invention;

Figure 2 is a cross-sectional view of the sanitary napkin of Figure 1 along section line 2-2, the blocking means being formed by the topsheet;

Figure 3 is a sectional view of a sanitary napkin according to the present invention, said barrier means being formed by said topsheet and disposed within the periphery of said core;

Figure 4 is a cross-sectional view of an embodiment of a sanitary napkin according to the present invention, said barrier means being formed by said backsheet;

Figure 5 is a cross-sectional view of an embodiment of a sanitary napkin, the barrier means being formed from a strip of foam,

Figure 6 is an embodiment of a sanitary napkin, the blocking means is formed by a cantilever;

Figure 7 is an embodiment of a sanitary napkin having said wings, said barrier means being formed of strips bonded to said wings,

Figure 8 is a front view of an ordinary panty in which a sanitary napkin according to the invention can be used,

Figure 9 is a cross-sectional view of the underpants of Figure 8 taken along section line 6-6 showing the sanitary napkin of Figure 1 contained therein, and

Figure 10 is a partial circular view showing the sanitary napkin and underpants of Figure 8 in section worn on a user.

Figures 1 and 2 show a preferred embodiment of the sanitary napkin of the present invention. The sanitary napkin 210 includes an absorbent means represented by a central absorbent pad 212 and two wings 224 and 224' (in the following discussion, unless otherwise indicated, the sanitary napkin will have two wings. Although both The wings do not have to be the same or exactly the same, but they are preferably mirror images of each other. Therefore, a description of the first wing will also be a description of the second wing, so, for clarity of explanation, Discussion of the second wing will be omitted. In the drawings, corresponding elements are indicated by reference numerals or primed reference numerals.)

The flaps 224 are attached to the central absorbent pad 212 along a non-linear bond line 226 . The term "non-linear" as used in the context of this specification means any curve which is different from a straight line.

Flap 224 has a distal edge 278 distal from line of engagement 226 . In the embodiment shown in FIG. 1 , the bond line 226 is concave relative to the distal edge 278 . That is, bond wire 226 is bent away from distal edge 278 . In this embodiment, non-linear join lines 226 and 226' and seam 239 define the contour of an absorbent device (central absorbent pad 212) that is narrower at its central region than at its ends. Users find that sanitary napkins that are narrower in the center than the ends are generally more comfortable than uniform widths.

The flap 224 has a first notional axis of flexibility 256 and a second notional axis of flexibility 234 .

Figure 2, a cross-sectional view of the sanitary napkin 210 taken along section line 2-2, illustrates in general terms the preferred construction of the sanitary napkin 210. As shown in FIG. 2 , the central absorbent pad 212 includes an absorbent core 216 . Both the central absorbent pad 212 and the wings 224 comprise a topsheet 214. The backsheet 218 is disposed on the opposite side of the absorbent core 216 and wings 224 from the topsheet 214 . In effect, the topsheet 214 forms one surface of the wings 224 and the backsheet 218 forms the other surface of the wings; the topsheet forms one surface of the central absorbent pad 212 and the backsheet forms the other surface thereof. In the illustrated embodiment, the wing absorbent core 230 is inserted between the topsheet 214 and the backsheet 218 . The wing absorbent core 230 extends through the sanitary napkin 210 and is inserted between the absorbent core 216 and the backsheet 218 for structural simplicity. While this is a preferred embodiment primarily for structural reasons, it is not necessary to insert the flap absorbent core 230 between the absorbent core 216 and the backsheet 218.

The topsheet 214 and the backsheet 218 are joined around the entire perimeter seam 239 of the sanitary napkin 210. The purpose of this seam is to join the different parts of the sanitary napkin into a whole. The topsheet 214 is secured to the wing absorbent core 230 and the backsheet 218 by means of attachment means (not shown in FIG. 2 9) along non-linear join lines 226 and 226'.

Shown in FIG. 2 are adhesive attachment means, center pad adhesive 220 and wing adhesive 236, which are covered with a center pad release liner 220 and wing release liner 238, respectively. The adhesive attachment means is suitable for securing the sanitary napkin 210 in the crotch area of the panty.

The topsheet 214 is liquid permeable and, when the sanitary napkin 210 is in use, it conforms closely to the skin of the wearer. The topsheet 214 conforms to the human body, feels soft and is non-irritating to the user's skin. It can be made of any material conventionally used for such purposes. Non-limiting examples of suitable materials that may be used as the topsheet 214 are woven or nonwoven polyester, polypropylene, nylon, and rayon, and formed thermoplastic films; formed films are preferred. Suitable formed films are described in U.S. Patent No. 4,324,246 issued April 13, 1982 to Mullane and Smith and U.S. Patent No. 4,342,314 issued August 3, 1982 to Radel and Thompson, both of which are incorporated herein by reference. . Formed films are preferred for use as the topsheet 214 because they are liquid permeable and also nonabsorbent. Thus, the surface of the formed film that comes into contact with the body remains dry and more comfortable for the wearer.

In a preferred embodiment of the invention, the outer surface of the topsheet 214 is treated with an active agent. Treating the outer surface of the topsheet with a surfactant renders the surface more hydrophilic, allowing liquid to pass through the topsheet faster than an untreated surface. This will reduce the possibility of menses flowing off the topsheet 214 and not being absorbed by the absorbent core 216. It is preferred that the surfactant is distributed substantially evenly and throughout the entire outer surface of the topsheet 214. This can be accomplished using common techniques well known to those of ordinary skill in the art. For example, the surfactant can be applied to the topsheet 214 by spraying, priming or by using a transfer roller.

In a preferred embodiment, the inner surface of the topsheet 214 is secured to the absorbent core 216 in intimate contacting relationship. This contact relationship allows liquids to pass through the topsheet 214 more quickly without contacting the absorbent core 216. The topsheet 214 may be applied to the inner surface of the topsheet 214 with an adhesive, preferably in spaced, limited areas, maintained in contact with the absorbent core 216. Examples of suitable adhesives for this purpose include the brands Acrylic emulsion E-1833BT (produced by Rohm and Hass Co., Philadelphia, Pa.) and acrylic emulsion designated WB380S (produced by H.B. Fuller Co., St. Paul, Minn.). This adhesive can be applied in the same manner as the surfactant is applied to the outer surface of the topsheet 214.

Referring to FIG. 2 , it can be seen that the absorbent core 216 is positioned between the topsheet 214 and the backsheet 218 . The absorbent core 216 provides a means for absorbing menses. The absorbent core 216 is generally compressible, comfortable, and non-irritating to the user's skin. It can be made of any material used for this purpose in the art, examples of suitable materials are thin fabric layers (such as wadding) and fiberized pulverized pulp (hollow mat), and fiberized pulverized pulp, which are all preferred.

The backsheet 218 is liquid impermeable, thus, it prevents menses that may be expressed from the absorbent core 216 from soiling the user's clothing. Here, any material used for this purpose in the field can be used. Suitable materials are embossed or non-embossed polyethylene films and laminates.

The outer surface of the backsheet 218 is generally aligned with the absorbent core 216, on which the central pad adhesive 220 is coated. The central pad adhesive provides an adhesive attachment means for securing the central absorbent pad 212 to the panty crotch. Any adhesive or glue used in the art for such purposes can be used here, preferably a pressure sensitive adhesive, a suitable adhesive is Century A-305-IV (by the Cehtury Adhesives Corporation-ation Manufactured) and Instant Lok 342823 (manufactured by National Sfrarch Co.). As shown in Figure 2, the central pad adhesive 220 generally has the same width as the absorbent pad 216, but this width is not critical, and the appropriate width also has a length selection, which is easy for those of ordinary skill in the art Yes, the pressure sensitive adhesive of the center pad adhesive layer 220 should be covered with a center pad adhesive release liner to keep the adhesive from drying out and to keep it from sticking to extraneous surfaces prior to use superior. Any of the commercially available release liners commonly used for such purposes may be used herein. Non-limiting examples of suitable release liners are BL30MG-ASilox E1/0 and BL30MG-A Silox AP/O, both of which are manufactured by Krosil Corporation.

As seen in the foregoing discussion, the central absorbent pad 212 is an absorbent device: it has a liquid-permeable contact surface, (represented by the topsheet 214 in FIG. 2 ) and a relatively liquid-impermeable surface. surface, (represented by negative 218 in FIG. 2). It should be understood that this embodiment is illustrated by a single example, although this is a preferred example. Other embodiments include one in which the absorbent core is substantially entirely wrapped by the topsheet before it is attached to the backsheet. The absorbent device may also comprise an absorbent core of sufficient integrity to stand alone and which is liquid-permeable on one surface and which has been treated on the other surface to ensure its Impermeable to liquids.

It should be noted that the narrow central absorbent pad 212 is effective because the overall construction of the sanitary napkin 210 and the use of the central absorbent pad 212 maintains a close fit. This closeness of the central absorbent pad 212 allows it to be placed exactly where it should be, very close to the body outside the vaginal opening. Thus, the central absorbent pad 212 can absorb most of the menses before it has a chance to flow along the central absorbent pad 212 .

It will be found that the joining lines 226 and 226' are the lines along which the wings 224 and 224' and the absorbent means (represented by the central absorbent pad 212) join together; the demarcation line. It will also be found that the lines of engagement are non-linear in such embodiments, however, may be straight and preferably they are concave relative to the distal ends 278 and 278', and the main body of the central absorbent pad 212. Thus, the absorbent means assumes a shape in which the width at its center is smaller than the width at its edges. This profile shape closely approximates the anatomical dimensions of the user's bifurcation. This makes the sanitary napkin more comfortable for the wearer and, at the same time, more effective by ensuring that it is less squeezed by the user's legs. While non-linear seams that are raised relative to the body of the distal central absorbent pad could also be used, they are not preferred.

Preferably, the width of the central absorbent pad 212 is approximately 1 to 8 centimeters at the nearest point between junctions 226 and 226'. The central absorbent pad 212 is approximately 2 to 9 centimeters wide at its ends. The length of the central absorbent pad is approximately 7.6 to 38 cm.

The central absorbent pad 212 need not have a substantially greater absorbent capacity than the total menstrual flow expected to be absorbed. Thus, the central absorbent pad 212 can be relatively thin in addition to being narrow, so that a thin and narrow absorbent device is extremely comfortable for the user. In the embodiment depicted in Figures 1 and 2, the topsheet 214 does not serve as a topsheet for the flaps 224 and 224'. Generally speaking, wings do not need a topsheet for them to function properly, but it is better to use a topsheet. The wing topsheets may be integral with the main body contacting surface of the absorbent device, or they may be separate elements as shown; the former is preferred. All of the specific physical property suggestions made above with respect to the topsheet 214 are applicable to any wing topsheet used. However, the flap topsheet need not be of the same material as the topsheet associated with the central absorbent pad. In some preferred embodiments, the flap topsheet may be a nonwoven material, while the topsheet associated with the central absorbent pad is a formed film.

In the embodiment shown in Figures 1 and 2, the backsheet 218 serves as the backsheet for the flaps 224 and 224'. The wings require a backsheet (or more generally a liquid impermeable material) in order for them to function properly. The flap backsheet may be integral with the liquid impermeable surface of the absorbent device, as shown, or they may be a separate element; the former being preferred. All of the specific physical properties suggested above with respect to the backsheet 218 are applicable to any wing backsheet.

The overall dimensions of the wings 224 can be readily selected by one of ordinary skill in the art. Preferably, the sanitary napkin 210 has a width of about 10 to 23 centimeters at the greatest separation between distal ends 278 and 278'. The length of the wings 224 in a direction parallel to the longitudinal axis of the sanitary napkin is preferably about 7.6 to 18 centimeters.

The outer surface of flap 224 adjacent distal end 278 is coated with flap adhesive 236 .

The flap adhesive 236 is an adhesive attachment means used to assist in holding the flap 234 in place after it has been wrapped around the edge of the panty crotch, as described below. Any adhesive used as center pad adhesive 220 can be used as wing adhesive 236. In addition, wing adhesive 236 covers a removable wing release liner 238 . Any wing material that can be used as the center pad release sheet 222 can be used as the wing liner 238 .

As shown in FIGS. 1 and 2 , the topsheet 214 is secured to the backsheet 218 along a seam 239 . Seam 239 may be formed using any method commonly used in the art for this purpose, such as gluing, crimping, or heat welding. The seam 239 is shown around the edge of the sanitary napkin 210, which is a preferred embodiment for ease of manufacture. (Other methods of connecting the various pieces can also be used.)

Topsheet 214 may be secured to backsheet 218 along seam lines 226 and 226' using any technique for forming seam 239.

The flap 224 contains a first flexible shaft 256 and a second flexible shaft 234 . In use, the two flexible axes cause the flaps 224 to form a wall, as will be described hereinafter. These axes of flexibility may consist of a single fold line or may be provided along a continuous extent on said flap 224, which is bendable to bend about any desired line.

The first flexible axis 256 is made such that the wings can be bent along the first flexible axis 256 . When the sanitary napkin 210 has the structure shown in FIG. 2, the bending direction of the wings is upward. More generally, the direction of bending is such that it makes that portion of the wing 224 containing the distal end 278 generally follow an arc from its extended position around the first flexible axis 256 (as shown in FIG. 2 ). As shown) toward the liquid-permeable contact surface of the absorbent device (shown in FIG. The portion of the backsheet 218 aligned with the absorbent core 216 represents) rotation.

The second flexible axis 234 is configured such that the flaps can bend along the second flexible axis 234 . When the sanitary napkin 210 is in the structure shown in Figure 2, the bending direction of the wings is downward. More generally, the direction of said curvature is such: it makes that part that contains the flap 224 of distal end 278 generally start from its protruding part i (as shown in Figure 2) an arc Winding up the second flexible axis 234 toward the liquid-impermeable surface of the absorbent device (indicated in Figure 2 by the portion of the backsheet 218 that includes the central absorbent core 212 in alignment with the absorbent core 216), and away from the permeable surface of the absorbent device. The liquid contacting surface rotates (represented in Figure 2 by the portion of the topsheet 214 aligned with the absorbent core 216).

The first and second flexible shafts can be provided in various ways. A preferred method is shown in Figures 1 and 2. In the illustrated embodiment, the material of construction of the flaps 224 is chosen such that the flaps 224 are extremely flexible throughout their extension. Thus, flexible shafts 256 and 234 as shown are not a single and unique structure, but actually represent an infinite number of pairs of shafts. This arrangement is particularly preferred because it allows the sanitary napkin 210 to be easily adjusted in use to fit many size-specific underpants and in use to the anatomical requirements described below.

The flexibility of the entire flap 224 allows it to be positioned around the crotch edge of the undergarment without altering the inherent contour of the crotch edge of the undergarment. Thus, it is not necessary to stretch the panty crotch section edges to accommodate the second flexible axis of the flap. Furthermore, the inherent contour of the sides of the panty crotch region creates the highest enclosure when the sanitary napkin is in use; in other words, this provides the greatest resistance to menstrual flow.

In the embodiment of the sanitary napkin 210 shown in Figures 1 and 2, it is preferred that the material of construction of the flaps 224 be selected so that it has a resistance to bending of less than 200 grams, more preferably less than 50 grams, when turned through 90°. Grams, most preferably less than 7.5 grams, as measured using The PLA Score bend tester manufactured by Thwing-Albert Instrument Company of Phiadephia, Pa. These data were obtained when a section, 7.6 cm long flap, (flap held 2.5 cm above the bottom edge of the test ramp) was evaluated under TAPPI standard conditions.

Theoretically, shafts are generally considered to be linear components. The flexible shafts of the present invention are also generally linear. However, since the material used to construct the flaps is flexible to such an extent that the flaps can be easily bent and folded by the human body, the flexible axis can become non-linear under the influence of external forces. of.

As shown in Figure 1, the first flexible shaft 256 is close to the joint line 226, in fact, the first flexible shaft 256 may intersect the joint line 226, at this point, the latter contacts the outer edge (the outer edge) in the sanitary napkin. indicated by seam 239). In general, this will be the only situation where the first flex axis 256 and the bond line 226 are in contact or coincide. It should be understood, however, that external forces applied during use may cause the first flexible shaft to move toward the line of juncture so that, in some instances, the two may contact or coincide.

The sanitary napkin is composed of a liquid-permeable topsheet, a liquid-impermeable backsheet and an absorbent core inserted between the topsheet and the backsheet; outwardly extending wings from each longitudinal side of the central absorbent pad, wherein the line of juncture between each wing and the longitudinal side of the central absorbent pad is linear; each wing has a Therefore, the sanitary napkin can preferably not be bent on the line of linear juncture of each wing and the longitudinal side of the central absorbent pad, but also can be bent on the flexible axis located in the main body of the wing , these sanitary napkins, although significantly different from those of the present invention, function in a manner that mimics the present invention.

The precise shape of the flaps 224, as well as the overall shape of the sanitary napkin 210, can be selected by one of ordinary skill in the art without undue experimentation. In the embodiment depicted in Figures 1 and 3, the flaps are disposed symmetrically along the longitudinal axis of the sanitary napkin; although this is a preferred embodiment, it is not a mandatory design feature , as has been noted previously, the two flaps are usually mirror images of each other; while this is preferred, it is likewise not a design condition that must be followed.

Additionally, the sanitary napkins shown in Figures 1 and 2 are embodiments wherein the flaps are integrally formed with the topsheet and backsheet of the sanitary napkin. Again, while this is a preferred method of composition, it doesn't have to be followed. The flaps and central core absorbent means can be formed separately and combined using techniques well known to those of ordinary skill in the art in such a way that the resulting sanitary napkin functions substantially equivalently to the embodiments herein.

When intended for use, the sanitary napkin of the present invention may be held in place by any known supporting means for this purpose, for example, a belt worn around the waist of the wearer may be used, however, it is most preferably held as described below. They are fastened to the user's panties.

Fig. 8 is the underpants of the type commonly worn by many women, called panties. It includes a front piece 240, a back piece 242 and a bifurcated portion 244 connecting the front piece 240 and the back piece 242 together. The bifurcated portion 224 includes two sides 246 and 246 ′ and a central bifurcated portion 248 .

The sanitary napkin of the present invention, for example, shown at 210 in FIGS. as shown. The center of central absorbent pad 212 is fixed on the bifurcated part 224 of shorts, and its one end stretches to the front panel 240 of shorts, and the other end stretches to the rear panel 242 of shorts, and rear panel 218 is connected with the central bifurcated part of shorts. The inner surfaces of 248 are in contact. The central pad adhesive 220 holds the central absorbent pad in place, and the distal ends of the flaps 224 and 224' are bent along the second axes of flexibility 234 and 234', respectively, and folded around the side edges 246 and 246' of the panty. Flap adhesive 236 and 236' secures flaps 224 and 224' in this position. Thus, flaps 224 and 224' are each folded over themselves and a portion of the panty, including sandwiching sides 246 and 246' between them.

Numerous benefits can be derived from the sanitary napkins of the present invention. Flaps 224 and 224' are wrapped around each side 246 and 246 of bifurcated portion 244 of the pant, as shown in FIG. This closure of the crotch of the panty helps prevent menses from coming into contact with the crotch portion of the panty so that said crotch portion of the panty will not become soiled.

There are two more advantages. One is that the wing portion containing the second flexible shafts 234 and 234' provides a gasket-like seal against the human body. The other is that the central absorbent means, such as the central absorbent pad 212, maintains an excellent contact relationship with the human body.

The sides of the panty portion usually contain elastic material. When worn, the elastic material at the sides of the bifurcated portion will generate an upward force against the body due to the energy in the elastic material and the fit of the panties. A second axis of flexibility, for example, second axes of flexibility 234 and 234', is provided between the human body and the sides of the crotch portion of the panties so that the upward force generated by the sides of the crotch portion of the panties will The wing portion containing the second flexible shaft is comfortably pushed against the body, which results in a strip gasket seal along the flexible shaft between the wings and the human body. This is illustrated in Figure 10, which is a partial circular view showing the sanitary napkin and panties shown in Figure 8 cut away and worn on a human body. (Annulus is the front plan view through the longitudinal axis of the human body.) This gasket-like seal helps prevent menses from penetrating beyond the second flexible shaft, in other words, this minimizes contamination of the legs and nearby clothing. lowest. Another benefit obtained by the flaps being comfortably pushed towards the body along the second axis of flexibility is that the absorbent means (central absorbent pad) is forced to approach or conform to the body. This is also illustrated in Figure 10. Maintaining the body fit of the central absorbent pad is referred to as "good body contact". The benefits of good human contact are due to the fact that it blocks the lateral flow of menses. Without such a barrier, menses would tend to flow rapidly along said topsheet, giving less time for said absorption of menses.

Original bunching is the crease along the transverse axis of a sanitary napkin that results from the sanitary napkin being originally intended for use within a panty. (The transverse axis of the sanitary napkin extends across the "bifurcation region" of the sanitary napkin, generally parallel to line 2-2 of Figure 1.) This pre-existing knuckle is due to the fact that. That is, the sanitary napkin is substantially rectilinear along its longitudinal axis, and follows the anatomical contours of the human body such that the sanitary napkin lays in a substantially "U" shape. (The longitudinal axis of the sanitary napkin extends from one end of the central absorbent means to the other, and is generally perpendicular to line 2-2 of Figure 1.) Thus, once the sanitary napkin is in place, its shape extends along its longitudinal axis. The straight line on the axis is transformed into a "U" shape. This change in shape produces some creases along the transverse axis of the sanitary napkin, with the greatest creases occurring at the point of greatest curvature of the body, ie the split.

Forced bunching Wrinkling of a sanitary napkin along its transverse or longitudinal axis caused by the movement of the user's legs.

The creases of the sanitary napkin due to pre-existing and forced gathers are known as flow channels because menses can easily flow along the grooves of the creases in the absence of effective body contact along said creases.

The sanitary napkin of the present invention provides a number of advantages due to the flexing of the flaps on the first axis of flexibility. In particular, it brings the following benefits:

(1) The original knuckles resulted in flow channels essentially only in the center absorbent pad, not in most of the flaps;

(2) The sanitary napkin of the present invention can withstand a lot of forced bunching before forming a flow channel;

(3) Even if the forced bunching is severe enough to create a flow channel, the channel formed is practically limited to the central absorbent pad; and

(4) The menses is inhibited from penetrating between the second flexible shafts of the wings even if the forced gathers are so large that flow channels are created in both the central absorbent pad and the wings outside.

These four advantages are achieved due to the fact that the sanitary napkin of the present invention has a barrier or wall 107 and also due to its ability to bend along a flexible axis. The anatomical characteristics of the bifurcated part of women's buttocks are as follows: the bifurcated part is basically trapezoidal, and the bifurcated central area located at the vaginal opening is the bottom of the trapezoid. When a sanitary napkin of the present invention, such as the embodiment shown in Figures 1 and 2, is in use, the anatomical characteristics of the crotch region force the sanitary napkin to form a crotch on each side of the central absorbent pad. A wall; said wall extending from said first flexible axis to said second flexible axis, as described in FIG. 10 . Thus, in use, when the user is in an upright position, the sanitary napkin of the present invention has a planar, well-like shape formed by said second flexible shaft (234 and 234'), said planar surface being defined by The sides (246 and 246') of the bifurcated portion of the surrounding panty surround and are above the plane formed by said first axis of flexibility (256 and 256').

The existing polypods on the sanitary napkins of the present invention are mainly limited to the central absorbent pad; virtually no flow channels are formed in the walls. Without being bound by any theory, it is believed that as the flow channels are formed, the energy that creates them is transferred across the central absorbent pad and lengthens the flow channels. This process continues until the flow channel reaches the first flexible shaft. The flow channel does not extend beyond the first flexible shaft, which is believed to be due to the first flexible shaft releasing the energy that enables the flow channel. The flow channel will then not be able to touch the gasket-like seal formed between the flap and the body on the second axis of flexibility, and thus the seal will remain intact. The gasket-like seal forms a barrier and stops the flow of menstruation. The menses can then be absorbed by the absorbent core.

The sanitary napkin of the present invention can withstand considerable forced bunching before any flow path is created because the energy transferred to the sanitary napkin by said forced bunching causes the wall to tend to rotate about each first axis of flexibility. Without such rotation, flow channels would form.

Even if the forced gathers are large enough to form flow channels, these channels will be substantially limited to the central absorbent pad. For the same reason, the original gathers also create flow channels in the central absorbent pad. Thus, the gasket-like seal will remain intact and form a barrier against the flow of menses until it is absorbed by the absorbent core.

Even if the forced bulking is so strong that flow channels are formed on both the central absorbent pad and the wings, menses is still inhibited from penetrating out of the wall 107 and out of the second flexibility of the wings. axis. Such flow channels may destroy the described gasket-like sealing effect. However, menses is inhibited from penetrating from the second flexible shaft of the wings due to the fact that these walls themselves form a barrier to menses flow. In order to penetrate the crack in the gasket seal, menses would have to flow up through the wall, which flow is actually directly under the force of gravity when the user is standing upright. In this way, the walls themselves inhibit the flow of menstruation.

In summary, the sanitary napkins of the present invention actually only form flow channels in the central absorbent pad, which allows the gasket-like seal to remain intact. As a result, menses will not be able to flow beyond the gasket-like seal. However, if the coercion is so strong that the gasket-like seal is ruptured, only the wall itself can restrict the flow of menses.

It is important to note that Figure 10 illustrates that the flap adhesive 236 is only on the "outer" surface of the panty when it contacts the sides of the panty. Although this is an alternative way of securing the sanitary napkin to the panty, the flap adhesive still only contacts the panty on its "inner surface" or on both its "inner" and "outer" surfaces edge of the side such that a portion of the flap extends around or near the side of the panty.

The sanitary napkin of the present invention is provided as a sanitary napkin with two wings. The means by which each flap forms a wall in use has already been described. While this embodiment is highly preferred, it is contemplated that there are also devices without or with only one wing. Such a flap with only one flap should be joined to the central absorbent means along a non-linear joint line. Said flaps should contain at least two, preferably at least four, axes of flexibility which will allow the flap to fold completely over at its bifurcated portion around the panty to form the two walls described above. Said flaps are then joined to said central absorbent means along a non-linear joint line opposite the above-mentioned one.

In the sanitary napkin embodiments of the present invention illustrated and discussed above, the adhesive attachment means is proximate the distal ends of said wings and is aligned with said central pad. These components designed to securely retain the sanitary napkin in the crotch region of the panty are some very desirable components. Without compromising that orientation, it can be asserted that those embodiments of the invention which in fact lack one or more of the described adhesive attachment means are also useful, novel, effective means.

The embodiment described in Figures 1 and 2 can be easily adapted for use as an embodiment of the invention that actually lacks one or more adhesive attachment means.

For example, the central adhesive 220 (and, of course, the central pad release liner 222 to which it is bonded) may be omitted from the sanitary napkin 210 described in FIGS. 1 and 2 . In use, this modified embodiment will be placed within the crotch region of the panty, just like the unmodified embodiment, except that the central absorbent pad 220 is not secured to the crotch region of the panty. Inside. Flaps 224 and 224' may be secured around the elastic sides of the panty with flap adhesive 236 and 236' as described above. The panties with the attached improved sanitary napkin can then be worn by the user as before. Adhesives 236 and 236 cooperate with the elastic sides of the panty to hold the improved sanitary napkin in place.

The sanitary napkin 210 can be modified in a similar manner by only omitting the flap adhesives 236 and 236' (and the release liners 238 and 238'). This improved sanitary napkin will be secured in the crotch region of the panty with center pad adhesive 220 and the flaps will only be folded around the elastic edges.

The sanitary napkin 210 can be modified in a similar manner by omitting the flaps and center pad adhesive. In use, the improved sanitary napkin will be held in place only by the cooperation between the flaps, the elastic sides of the panty and the body of the user.

Figure 3 shows an embodiment wherein the topsheet comprises a central pad 105 and is folded over its edge portion 103 . On the periphery of the core 48, the topsheet comprises, for example, two layers joined together by adhesive or ultrasonic welding techniques, the free edge 109 of the wall 107 formed by the topsheet is fixed to the absorbent core 48 in its periphery. At the top, the perimeter is bounded by sides 226 and 226', as described in FIG. 1 . A tightening element is attached to the free edge 109 in the form of a rubber band 77 .

In the embodiment of Figure 4, the wall 107 is formed by the backsheet 42 which is folded around the core 48 and joined to the topsheet 40 in a joining zone 108 on top of said core.

In the embodiment shown in Figure 5, the wall 107 is formed by a strip of foam 100 positioned on top of the core 48, but below the topsheet. The sanitary napkin of Figure 5 has tabs 43 for attachment to the wearer's undergarments, as shown in Figure 10 .

In the embodiment of FIG. 6 , the wall 107 is formed by a flexible cantilever 102 connected between the top sheet 40 and the bottom sheet 42 .

Figure 7 is a partial cross-sectional view depicting the structure of the crotch region of a further embodiment of the sanitary napkin according to the present invention, deformed before it is worn on the wearer, (i.e. the sanitary napkin is subjected to elastic contraction) . The absorbent core 44 includes an absorbent layer 48 shown completely surrounded by first and second fabric layers 50 and 52 . The absorbent core 44 is disposed between the topsheet 38 and the backsheet 42 , both of which extend beyond the side edges 46 of the absorbent core 44 to define side flaps 58 . The juxtaposed regions of the topsheet 38 and the backsheet 42 are secured together by adhesive 88 bonding.

The barrier means 62 shown is formed by securing an element to the topsheet between the outer edges of the flaps and the side edges 46 of the absorbent core 44, the proximal edge 64 of the barrier means 62 being bonded to the top sheet with an adhesive 92. The barrier element is fixed to the top sheet 38 to form, and the isolation elastic 77 is enclosed in a tunnel formed when said barrier element is folded back on it; the isolation elastic 77 is secured to the barrier 62 by means of elastic attachment means 94 among. The far edge 66 of described blocking device utilizes the elastic contraction effect of separating elastic part 77 to be separated from the surface of top sheet 38; Then, form a groove 96 by the inboard surface 68 of near edge 64, far edge 66 and blocking device 62 at least, Channel 96 is shown which confines, contains and retains bodily fluids until the sanitary napkin 210 is removed from the wearer.

The topsheet 38 is form-fitting, soft-feeling and non-irritating to the wearer's skin, in addition. The topsheet 38 is liquid pervious, allowing liquids to readily pass through its thickness. Suitable topsheets can be made from a wide range of materials, such as porous foams, reticulated foams, perforated plastic films, natural fibers (such as wood fibers or cotton fibers), synthetic fibers (such as polyester or polypropylene fibers) or Composition with natural and synthetic fibers. It is preferably made of hydrophobic material. In order to isolate the wearer's skin from the liquid in the absorbent core 44.

A particularly preferred topsheet 38 comprises 1.5 denier (denier) rayon length polypropylene fibers, such as Hercules Type 151 polypropylene distributed by Hercales Inc. of Wilmington. Del. The term "rayon length fibers" is used herein to refer to those fibers having a length of at least 15.9 mm (0.625 inches).

There are many manufacturing techniques that can be used to make the topsheet 38, for example, the topsheet 38 can be woven, nonwoven, silk bonded (Spanbonded), carded, or the like. A very suitable topsheet is carded and thermally bonded by methods well known to those skilled in the fiber arts. Preferably, the topsheet 38 has a basis weight of from about 18 to 25 g/m ² , a minimum dry tensile strength of at least about 40 g/cm in the machine direction, and a wet tensile strength of at least 55 g/cm in the vertical direction. .

The absorbent core 44 is generally any device that is compressible, comfortable, non-irritating to wear and skin, and capable of absorbing and retaining body fluids. A preferred absorbent core 44 has a first side and a second opposing side and is comprised of an absorbent layer 48 and first and second fabric layers, respectively. The first and second fabric layers are superimposed on the major surfaces of the absorbent core 48 to form first and second opposing surfaces of the absorbent core.

The absorbent layer 48 can be made in various sizes and shapes (e.g., rectangular, hourglass, etc.), and is made of various liquid-absorbent materials commonly used in absorbent articles, such as ground pulp, which is commonly referred to as hollow felt. manufacture. Examples of other suitable absorbent materials include creped fibrous wadding, absorbent foams, absorbent sponges, superabsorbent polymers or any equivalent material or combinations thereof. However, the overall absorbent capacity of the absorbent layer 48 should be consistent with the designed body fluid load of the sanitary napkin at the time of its intended use. In addition, the size and absorbency of the absorbent layer 48 can be varied to accommodate different wearers.

The size, shape and configuration of the absorbent layer 48 may vary, for example, the absorbent layer may be of different thickness or degree of hydrophilicity, or may contain superabsorbent material or synthetic fibers.

The first and second fabric layers 50 and 52 improve the tensile strength of the absorbent core 44 and reduce the tendency of the absorbent layer 48 to split, clump or ball up when wetted. The first and second fabric layers also help to improve the lateral penetration of absorbed body fluids, thereby allowing for a more even distribution of body fluids throughout the absorbent layer 48. Although there are many materials and manufacturing techniques that can be used to make the first and second fabric layers 50 and 52, satisfactory results are obtained using a base weight of about 16 g/ ^m2 (10 pounds per 3000 square feet) and an air permeability of A thin paper sheet of approximately 30.5 cubic meters per square meter per minute (100 cubic feet per square foot per minute) at a differential pressure of approximately 12.8 millimeters of water (0.5 inches). The first and second tissue layers 50 and 52 are preferably attached to the absorbent layer 48, however, they may be of different sizes, different configurations or they may be omitted entirely.

The absorbent core 44 is superposed on the backsheet 42 and is preferably attached to the backsheet 42 by attachment means such as those known in the art (not shown). For example, the absorbent core 44 may be secured to the backsheet with a uniform, continuous pattern of adhesive, or a patterned layer of adhesive or an array of discrete lines or spots of adhesive. An adhesive which has been found to work satisfactorily is manufactured by Eastman Chemical Products Company of Kingsportin, Tenn. and sold under the trade mark Eastobond A-3.

The backsheet 42 is liquid-impermeable and is preferably made of a thin plastic film, although other flexible materials can also be used. The backsheet 42 prevents bodily fluids absorbed and retained in the absorbent core 44 from wetting the articles in contact with the sanitary napkin. Such as panties. The backsheet 42 is preferably a polyethylene film having a thickness from about 0.012 mm (0.5 mil) to about 0.051 cm (2.0 mil), although other flexible liquid impermeable materials can also be used. As used herein, the term "flexible" means those materials that conform to the body and easily conform to the general shape and contours of the human body.

A suitable polyethylene film is manufactured by Monsanto Chemical Corporation and sold under the tradename Fitm No. 8020. The backsheet 42 may be embossed and/or textured to provide a cloth-like appearance. In addition, the backsheet 42 allows moisture vapor to escape from the absorbent core 44, while it still prevents liquid from passing through the backsheet 42.

The topsheet 38 and the backsheet 42 may be attached to each other in any suitable manner. When the meaning of the term "connecting" includes such structures, therefore, the backsheet 42 is directly connected to the topsheet 38 by directly fixing the topsheet 38 on the backsheet 42; it also includes such structures, and these intermediate The topsheet 38 is indirectly secured to the backsheet 42 in such a way that the components are in turn secured to the backsheet 42 . In a preferred embodiment, the topsheet 38 and backsheet 42 are directly attached to each other along the periphery by attachment means. Said attachment means such as: adhesive or any other well-known attachment means in the art. For example, a uniform continuous adhesive, or a patterned adhesive or any arrangement of discrete lines of dots of adhesive may be used. The side flaps 58 should be highly flexible.

Side flaps 58 are the portions of the sanitary napkin between the perimeter and edges of the absorbent core 44 . Thus, in one embodiment of the invention as shown in FIG. 7, the side flaps 58 are formed by the backsheet 42 and the topsheet 38 extending from and along the side edges 46 of the absorbent core 44. As shown in FIG.

Each barrier 62 is a flexible member having a proximal edge 64 , a distal edge 66 , a medial side 68 and an outer side 70 . The term "flexible" as used herein refers to materials that conform to the body and conform easily to the general shape and contours of the human body. In addition, if spacer 76 comprises spacer elastic member 77, stopper 62 must be shrinkable, therefore, far edge 66 can have enough spacing to be spaced apart from top sheet upper surface, has finally formed channel 96, so that limit, contain and Keep bodily fluids in this item. Barrier 62 may be fabricated from a variety of materials such as polyester, rayon, nylon, foam, plastic film, formed film, and resilient foam. Various manufacturing techniques can be used to manufacture the blocking means. For example, the barrier means can be a woven, non-woven, card or similar. A particularly preferred barrier means 62 comprises a material which contains no processing, or which is rendered liquid impermeable. A particularly preferred material is manufactured by the Crown Zellerbach Company under the name Celestra.

As shown in Figure 7, the blocking means 62, and in particular its proximal edge 64, is arranged on the inside of said flap, preferably adjacent said flap.

The term "inboard" is defined as the direction towards the centerline 36, which is parallel to the sides (226, 226') along which the particular blocking means 62 are located.

The blocking means 62 are provided to provide a more effective restraint of the flow of bodily fluids. The barrier means 62 is preferably disposed between the outer edges of the flaps and the longitudinal centerline 36 of the sanitary napkin.

The proximal edge 64 and the distal edge 66 are spaced apart from each other and define the width of the barrier. The proximal edge 64 and the distal edge 66 may be parallel, non-parallel, or in a linear relationship to each other. Furthermore, the blocking means 62 may have various cross-sections, including circular, square, rectangular, or any other shape. Preferably, the proximal edge 64 is spaced from the distal edge 66 in a parallel or linear relationship so as to provide the barrier 62 with a uniform width.

The embodiment of the sanitary napkin shown in FIG. 7 has barrier means 62 attached to the topsheet 38. As shown in FIG. The term "attached" includes any means for securing the barrier means to the sanitary napkin, and includes some embodiments in which the barrier means is a device with a proximal edge 64 directly or indirectly attached to the topsheet 38 (e.g. integral); or include some embodiments, wherein, blocking device 62 is to make with topsheet 38 same element or material, therefore, proximal edge 64 is continuous and inseparable topsheet element ( e.g. single). In other words, the barrier means 62 may be attached to the side flaps 58, the backsheet 42, the absorbent core 44, the topsheet 38, or any combination of these or other elements of the sanitary napkin. In the embodiment shown in FIG. 2, the barrier means 62 is formed integrally with the topsheet 38. As shown in FIG. The integral barrier means 62 is preferably formed from a single piece of material secured to the topsheet by adhesive 92, the distal edge 66 being formed by folding back one end of the material.

The distal edge 66 is preferably disposed inboard of the proximal edge 64, which provides a more effective barrier to fluid flow. The distal edge 66 is held inside the proximal edge 64 by adhesive means 78 in order to prevent them from being turned upside down. While the distal edge 66 may also be positioned in other locations in relation to the proximal edge 64, these locations are not preferred.

It is preferred that the distal edge 66 is not secured to any element at least in the central region of the sanitary napkin so that it can be spaced from the upper surface 40 of the topsheet 38. The distal edge 66 is preferably spaced from the upper surface of the topsheet 38 so that the barrier means 62 can form a channel 96 to enhance the containment of the article. When the term is used here, the word "separated" includes an embodiment in which the far edge 66 can accept one or more positions relative to the upper surface 40 of the topsheet 38, including accepting adjacent topsheets in some cases. A location on the upper surface 40 of the 38. The distance from the upper surface 40 of the far edge 66 to the top sheet 38 is along a line drawn by the closest part of the end edge 66 to the top sheet 38 when the far edge 66 is in order to be positioned, so as to be spaced apart from the top sheet 38 as far as possible ( That is, in the retracted position), the far edge 66 is preferably separated from the topsheet 38 by a height of at least 2 millimeters, more preferably a height of about 5 millimeters to about 10 millimeters.

Grooves 96 are formed along at least the proximal edge 64 , the distal edge 66 and the inner side surface 68 of the barrier 62 . When bodily fluids tend to flow through the topsheet 38, the grooves 96 provide a barrier to the flow of bodily fluids.

The blocking device 62 can also additionally be provided with absorbing means fixed on or in the blocking device 62 . The absorbent means absorbs and contains bodily fluids that come into contact with the barrier means 62 . The absorbent device may be any device capable of absorbing and retaining bodily fluids and may be of any size, shape, configuration or absorbent capacity. The absorbent means may be secured to the blocking means 62 along the inner side surface 68 or within the blocking means 62 . The absorbent means is preferably a layer of hollow felt secured within the aperture formed by the entire barrier means and along the entire length and width of the inside surface of the barrier means 62 .

Additionally, the barrier device 62 may be rendered liquid-tight to prevent the flow of bodily fluids. The liquid impermeable barrier 62 prevents the movement of liquid through the barrier, thus making it more leak resistant. Barrier 62 may be rendered liquid impermeable by any means known in the art, such as selective treatment of the barrier, or by immobilizing dispersed material to the barrier.

The spacer 76 that is used to far edge 66 and top sheet upper surface 40 separations can be any element, and this element makes stopper 62 gather, shrinks, strengthens, shortens or takes place other changes, so that form groove 96 along stopper 62 Provides an inhibitory effect on body fluid leakage.

As shown in FIG. 7, the isolating means preferably includes an isolating resilient member 77 secured within the interior of the barrier means 62 adjacent the distal edge 66. The isolating elastic member 77 is preferably secured to the blocking means 62 in a contracted state, whereby the isolating elastic member 77 is effective to collapse or gather the blocking means 62 in a generally unconstrained configuration.

As shown in FIG. 7, the isolating elastic element 77 is connected to the blocking means 62 by securing it within said blocking means with elastic attachment means 94. Although the spacer elastic member 77 could be secured to the stop means near the end of the spacer spring member 77, it is preferred that the spacer spring member 77 be secured to the stop means 62 for the entire length of the spacer spring member 77. The elastic attachment means herein are preferably pellets of hot melt adhesive, such as sold under the tradename Aahesives 581 by Adhesives Incorporated, Wis.

A suitable isolated elastic member 77 is a 0.18 mm x 1.5 mm cross-section elastic strand made of natural rubber, such as that supplied from the Rubber Company of Va. under the trademark L-1900 Rabber Compound product. Other suitable isolating elastic members 77 may be made of natural rubber, such as the elastic band sold under the trademark 9211 by Compnny of Sco-tland. N.C. Isolating elastic member 77 may also comprise any heat shrinkable material as is known in the art. Other suitable resilient materials may also include those known in the art, such as films, polyurethane membranes, foams, and molded rubber pads.

In addition, the isolation elastic element 77 can adopt different structures, for example, the width of the isolation elastic element 77 can be changed; the isolation elastic element may include a single stranded elastic material or several parallel stranded elastic materials; or The insulating elastic material 77 may be straight or curved. Furthermore, the isolating elastic member 77 may be secured to the blocking device 62 by any of several methods known in the art. For example, the isolation elastic 77 could be glued or heat welded to the barrier 62 using various adhesive types, or the isolation elastic 77 could simply be glued to the barrier 62 .

The spacer means 76 for isolating the distal edge 66 from the topsheet upper surface 40 may also be provided with reinforcing means disposed in or above each barrier means. The reinforcing means must be sufficiently rigid to separate the distal edge 66 from the topsheet upper surface 40. Suitable materials for use as reinforcing means include foam, fibers, batting, formed film from polyethylene film, spray glue, formed polyester, or high reinforcement materials such as those produced by Carolima Fobics.

Spacer means 77 may also include means for shortening the length of distal edge 66 compared to the length of the sides of the sanitary napkin. The distal edge can be shortened by folding or pleating the distal edge 66 . Such corrugations or folds may be secured by any retaining means known to those skilled in the art, such as adhesives or heat welding. In other words, a section may be cut from the distal edge and the cut sections brought together to form a connection or seam. The far edge 66 can also be shortened by attaching a portion of the length of the far edge 66 to the topsheet 38 at a position different from where the sanitary napkin is laid out, or other shortening techniques known in the art can be used. .

The adhesive means for securing the end of the barrier 62 against the lateral edge of the sanitary napkin provides a more comfortable fit for the user and eliminates inversion of the barrier 62 during application and use. Inversion is generally defined as the inwardly positioned distal edge 66 turning outward when the sanitary napkin is fastened on the wearer. In a preferred embodiment, such adhesive means are provided in the front and rear regions of said sanitary napkin. The remainder of the blocking means is not secured so tightly so that the far edge 66 can be released freely.

Adhesive means 78 are preferably adhesive particles comprising hot melt adhesives such as those sold under the Adhesives 581 trademark by Adhesives Incorporated., Wis.

Claims (15)

1. a sanitary towel (210) comprising:

A) a center absorption pad (212) has a body contacting surface, a periphery that comprises two vertical sides and two transverse sides, and this center absorption pad comprises:

A top flat (40,214),

Liquid-tight egative film (42,218) that links together with described top flat and

Absorbent cores (48,216) between described top flat and described egative film;

B) along described vertical side inboard or arranged outside be used for confined liquid mobile retention device on the parallel transverse side directions, each described retention device comprises a wall (107,107 '), this wall has the free margins (109,109 ') on the plane that is lifted at described center absorption pad; With

C) be attached to flap (43,58,224) on the underwear, described flap stretches out from each vertical side of described center absorption pad.

2. according to the sanitary towel of claim 1, it is characterized in that described egative film extends in outside the periphery of described center absorption pad with formation and is attached to flap on the underwear.

3. according to the sanitary towel of claim 1, it is characterized in that described egative film extends to described flap and is formed for the part of a flap egative film of described flap.

4. according to the sanitary towel of claim 1, it is characterized in that each described retention device is to be connected in described flap.

5. according to the sanitary towel of claim 3, it is characterized in that each described retention device is to be connected in described flap egative film.

6. according to the sanitary towel of claim 1, it is characterized in that described top flat extends to described flap and is formed for the part of a flap top flat of described flap.

7. according to the sanitary towel of claim 1, it is characterized in that each described retention device can see through liquid.

8. according to the sanitary towel of claim 1, it is characterized in that the free margins of each described retention device is arranged on the absorbent cores.

9. according to the sanitary towel of claim 1, it is characterized in that, the wall of each described retention device be by on the top that is positioned at described absorbent cores (48) but the foam strip (100) under described top flat constitute.

10. according to the sanitary towel of claim 1, it is characterized in that the free margins of the wall of described retention device has constriction device.

11. the sanitary towel according to claim 10 is characterized in that, described constriction device comprises a flexible member (77).

12. the sanitary towel according to claim 10 is characterized in that, described constriction device provides the free edge shortening by wrinkling.

13. the sanitary towel according to claim 6 is characterized in that, described retention device and flap top flat are structure as a whole.

14. the sanitary towel according to claim 1 is characterized in that, described absorbent cores has lateral margin and described flap has flexible shaft, and wherein each described retention device is connected between the lateral margin of the flexible shaft of described flap and described absorbent cores.

15. the sanitary towel according to claim 1 is characterized in that, comprises that also one is arranged on center pad bonder on the egative film and one and is arranged on and is used for fixing the flap bonder of sanitary towel on underwear on each described flap.

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