HUT71540A - Sanitary napkin having barrier means - Google Patents

Description

The present invention relates to absorbent articles having the following structure:

an absorbent core comprising a first surface, a second surface, and a circumferential portion comprising two longitudinal sides and two lateral sides;

- a liquid-permeable topsheet lying on the first surface of the core;

- a liquid impermeable backsheet located on the second surface of the core and connected to the upper panel; and

- boundary edges along the longitudinal sides, which generally serve to limit the migration of fluid migration parallel to the lateral sides.

Such a sanitary napkin is disclosed in British Patent No. 2,168,253.

The boundary edges described in the above-mentioned patent are located outside the core circumference and form a raised part of the top plate and the backsheet. Although the boundary edges limit lateral fluid migration, the rate of absorption of the fluid trapped between the boundary edges and the core may be reduced. The position of known sanitary napkins may shift during use.

It is an object of the present invention to provide limiting edges for use in sanitary napkins that are comfortable in use, effectively limit lateral flow of body fluids, and allow proper absorption.

Another object of the present invention is to provide a sanitary napkin that can be comfortably fitted to the wearer's underwear.

The sanitary napkin of the present invention comprises boundary edges consisting of walls with a free edge rising above the plane of the first surface of the core.

By placing the boundary edges so that at least the free edge is at the top of the absorbent core and not adjacent to it during use, the core easily absorbs the fluid spreading laterally on the top sheet.

In another embodiment of the present invention, the backsheet of the absorbent article extends beyond the core circumference during use to form underwear wings, and the wall forming the boundary edges engages wings adjacent to the core circumference.

The wings may be folded around the edge of the wearer's underwear as disclosed in U.S. Patent No. 4,687,478. It has been found that wings combined with boundary edges reduce lateral migration of body fluids. The boundary edges may be formed using a liquid impermeable wall or an absorbent strip and bonded to the wings by, for example, gluing or fusion bonding. The free edge of the wall, when using the sanitary napkin, is located to effectively absorb the body fluids retained by the wall, preferably within the perimeter of the core. However, the free wind is outside the perimeter of the core, or, for example, if you have formed a core. · · · · · · · · · · · · · · · · · · · · · · • ♦ · · · · ♦ · · · · · · · · · ·

4 may be used, it may be located within the periphery of the core and may be located over a wider portion of the core.

The present invention relates to an absorbent article having a wall formed by a spacer member disposed between the top panel and the backsheet.

The spacer is formed from a cantilever bracket made of resilient material which is located outside the core circumference between the top plate and the backsheet and presses the top plate upwards. When using the sanitary napkin, the insert is pressed sideways and the cantilever holder lifts the top plate. Preferably, the free edge of the wall is formed by the top panel and, when using the sanitary napkin, the bracket holder is compressed within the peripheral portion. As a result, the cantilever holder provides good body fluid absorption.

The boundary edge may also include a foam tape that is glued between the topsheet and the core or glued to the top of the topsheet.

Another object of the present invention is to provide an absorbent article in which the topsheet comprises boundary edges and a central portion lying on the core and the peripheral edge portions forming the wall and along the longitudinal sides of the core.

Although the top sheet is liquid-permeable, the boundary edges limit the lateral distribution of body fluids. If the wall is made using the top panel, the need for the installation of separate boundary edges ··· · · 9 · ··· ···

5 is reduced, so that fewer components are preferably required for the manufacture of the sanitary napkin. The boundary edges may extend over the entire circumference of the core to prevent general fluid migration along the longitudinal sides.

Preferably, the free edges of the boundary edges prior to use are so contracted that the boundary edges protrude during use and protrude from the backsheet for their configuration. The contraction can be caused by incorporating an elastic member pre-shrunk in the free edge of the boundary edges. The free edge of the boundary edges, which is formed by either the top panel or the backsheet or a combination of the two, can also be contracted by heating the shorter free edge of the boundary edges. This shortening of the free edge in the longitudinal extension of the sanitary napkin also causes the edges to be raised.

Some embodiments of the sanitary napkin of the present invention are described in more detail in the accompanying drawings.

Brief description of the drawings:

Figure 1 is a perspective view of a sanitary napkin according to the invention.

Figure 2 is a cross-sectional view taken along line 2-2 of the sanitary napkin of Figure 1.

Figure 3 shows a cross-sectional view of a variant of a sanitary napkin according to the invention, with the boundary edges of the backside of the sanitary napkin of the present invention; formed by the top plate and located within the perimeter of the core.

Figure 4 is a cross-sectional view of another embodiment of a sanitary napkin of the present invention with the backside formed by the backsheet.

Figure 5 shows a variant of a sanitary napkin according to the invention in which the boundary edges are formed with a foam band.

Figure 6 shows a variant of a sanitary napkin according to the invention in which the boundary edges are formed by a bracket.

Figure 7 shows a winged version of a sanitary napkin according to the invention in which the boundary edges are formed with a tape adhered to the wings.

Figure 8 is a front view of a conventional women's trousers in which the sanitary napkin of the present invention may be used.

Figure 9 is a cross-sectional view taken along line 6-6 of the pants of Figure 8; the figure shows the sanitary napkin in the pants.

Figure 10 is a wreath view of the cross section of the pants and sanitary napkin of Figure 8 while wearing.

A preferred embodiment of the sanitary napkin of the present invention is the articles shown in Figures 1 and 2.

The sanitary napkin 210 comprises a central absorbent pad 212 and wings 224 and 224. (In the description below, the term sanitary napkin is used to designate the two-wing pads, except If the wings are different, it is not necessary for the wings to be identical, but more accurately to each other, but preferably they are. Accordingly, the first description is suitable for the second. Therefore, for clarity, the second description is omitted. numbers and marked numbers.)

The flap 224 is connected to the central absorbent pad 212 along the non-linear line of the bond 226. As used herein, the term non-linear refers to any non-linear, differently curved line.

The distal edge 278 of the flaps 224 is located away from the boundary line 226. In the embodiment shown in Figure 1, the joint 226 is concave to the distal edge 278. Therefore, it is said that the line of bond 226 deflects from the distal edge 278. In this embodiment, the non-linear line of the joints 226 and 226 'and the rim 239 form an absorbent device (central absorbent pad 212) that is narrower in center region than at its ends. Thus, the sanitary napkin is narrower at the center than at the ends and, as a result, provides a more comfortable feel than uniform width inserts.

The wing 224 comprises a first apparent axis 256 and a second axis 234.

The sanitary napkin 210 shown in Figure 2 is a cross-sectional view along the line 2-2 of the sanitary napkin 210. advantageous construction. As shown, the central absorbent pad 212 comprises the absorbent core 216. The backsheet 218 is located on the side of the absorbent core 216 and the flap 224 on the opposite side of the top panel 214. In practice, top panel 214 forms one surface of wing 224; the topsheet 214 also forms one surface of the central absorbent core 212 and the other one the backsheet 218.

In the illustrated embodiment, absorbent core flap 230 is disposed between top panel 214 and backsheet 218. To simplify the construction, the absorbent core 230 covers the entire sanitary napkin 210 and is located between the absorbent core 216 and the backsheet 218. This variant is advantageous mainly because of its construction, but it is not necessary to place the absorbent core 230 between the absorbent core 216 and the backsheet 218.

The topsheet 214 and the backsheet 218 are joined to each other at a rim 239 surrounding the entire periphery of the sanitary napkin 210. The hem serves to unify the various elements of the sanitary napkin. The topsheet 214 engages the absorbent core 230 and the backsheet 218 along the nonlinear bond lines 226 and 22 'as shown in Figure 2.

Figure 2 shows that the central cushion 220 and wing adhesive members 236 are provided with removable central cushion 222 and removable wing cuffs 238. • · · · · «• · 4 ·« «« «« **

- 9 equipped. These adhesive members serve to fasten the sanitary napkin 210 to the underwear leg.

The topsheet 214 is fluid-permeable and is located near the wearer's skin while the sanitary napkin 210 is being worn. The topsheet 214 is a tactile material that is comfortable to touch and non-irritating to the wearer's skin and can be made from any conventional material suitable for such use. Suitable materials for making the topsheet 214 include woven and nonwoven polyester, polypropylene, nylon and rayon, and molded thermoplastic films; and of these, shaped films are preferred. Suitable molded films are described in U.S. Patent Nos. 4,324,246 and 4,342,314. Molded films are advantageous for forming the topsheet 214 because they are liquid-permeable but do not absorb. As a result, the body contact surface of the formed film 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 a surfactant. Treating the outer surface of the topsheet with a surfactant will make the surface more hydrophilic, so that the liquid will permeate the topsheet more quickly than with an untreated topsheet. This reduces the likelihood that the menstrual fluid flows from the top panel 214 in a direction other than the absorbent core 216. Preferably, the surfactant is uniformly and completely distributed on the outer surface of the topsheet 214. The treatment is suitable for any known, known as "4" "" 4 "" 4 '"4' ' · «·« «

- 10 processes, such as spraying, filling or rolling.

In a preferred embodiment of the invention, the inner surface of the topsheet 214 is secured in contact with the absorbent core 216, as a result of which the topsheet 214 is more fluid-permeable than if it was not in contact with the absorbent core 216. The contact of the topsheet 214 with the absorbent core 216 is maintained by means of an adhesive applied to the inner surface, preferably a defined, separated area of the topsheet 214. Suitable adhesives include E-1833BT from Rhom and Haas Co., Philadelphia, Pa., Or H.B. Fuller Co., St. Paul, Minn. WB 3805. The application of the adhesive to the outer surface of the topsheet 214 may be similar to the application of a surfactant.

2, the absorbent core 216 is disposed between the topsheet 214 and the backsheet 218. The absorbent core 216 serves to absorb menstrual fluid. The absorbent core 216 is generally compressible, comfortable and non-irritating to the wearer's skin. Any such material may be used in its preparation. Suitable materials include, for example, a fabric, such as a cotton pad, air-felted fibrous crushed pulp, preferably fibrous crushed pulp.

The backsheet 218 is a liquid impermeable material and thus prevents the wearer's clothing from being contaminated with the menstrual fluid that may be ejected from the absorbent core 216 **.

It may be prepared from any material conventionally used for this purpose. Suitable applications include pressed or non-pressed polyethylene films and layered fabrics.

The outer surface of the backsheet 218 is generally joined to the absorbent core 216 and secures the central absorbent pad 212 to the leg leg with the central pad adhesive 220. Any known adhesive or glue may be used for this purpose, preferably pressure sensitive adhesive. Suitable adhesives include Century A-305-IV from Century Adhesives Corp. and National Starch Co.

Instant Lók 34-2823. Figure 2 shows that the central pad adhesive 220 is generally of the same width as the absorbent core 216; however, the width is not critical and the appropriate width and length can be easily selected by one of ordinary skill in the art. The pressure sensitive 220 central pad adhesive, before the adhesive dries, and other

to avoid sticking to surfaces, a 222 shall be provided with a removable central protective tape. For this a

any commercially available removable protective tape may be used. Suitable for use are the products BL 30 MG-Ά Silox El / 0 and BL 30 MG-A Silox 4 P / O from Akrosil Corp.

In the following description, it can be seen that the central absorbent pad 212 is an absorbent device which is a fluid in contact with a body. On the other hand, it consists of a liquid impermeable surface (backsheet 218 in FIG. 2). This solution is a possible variant, but modifications thereof are within the scope of the invention. An example of such a possible embodiment is a product in which the absorbent core is completely backed.

It is also possible to use an absorbent device which is liquid in itself. It is noted that the narrow central core 212 is effective because the entire absorbent structure and use of the sanitary napkin 210 serves to provide close proximity to the body. THE

Thus, the absorbent core 212 is located exactly where it can, i.e. at the vaginal opening of the body. The central absorbent core 212 absorbs most of the menstrual fluid before passing through the central absorbent core 212.

It can also be observed that the bond lines 226 and 226 'are connected along the flaps 224 and 224' to the absorbent core (represented by the central absorbent core 212); and thus form a boundary between the absorbent device and the wings. In this embodiment, these bonding lines are nonlinear but may be straight. The bond lines are concave to the distal edges 278 and 278 'and to the extent of the central absorbent core 212. The absorbent device thus takes the form of a center width which is smaller than its ends. Such a contour mimics the anatomical dimensions at the wearer's forehead, making it comfortable for the wearer while being less exposed to the pressure exerted by the wearer's feet. Nonlinear bonding lines that are convex to the distal edges and to the extent of the central absorbent core may also be provided, but are not preferred.

The shortest width of the central absorbent pad 212 between the bond lines 226 and 226 'is preferably about 1-8 cm and the width at the ends is about 2-9 cm. The central absorbent pad 212 has a length of about 7.6 cm to 8 cm.

The absorbent capacity of the central absorbent pad 212 need not be much greater than the expected amount of menstrual fluid. Accordingly, the central absorbent pad 212 may be not only narrow but also relatively thin, which is more comfortable for the wearer. 1 and 2, the topsheet 214 also does not serve as the topsheet of the flaps 224 and 224 '.

Although it is not necessary for the wings to function properly, it is preferable to use a top plate. The upper flaps of the wings may be integral with the body-contacting surface of the absorbent core or may be separate elements as shown; the former version is preferred. Any material having special physical properties as described above for the top panel 214 may be used as the tops of the wings, but need not necessarily be made of the same material. In a preferred embodiment, the top sheet of the wings may be a nonwoven material and the top sheet of the central absorbent pad is a formed film.

In the embodiment shown in Figures 1 and 2, the backsheet 218 also serves as backsheets for the flaps 224 and 224 '. The wings require a backside (or, more generally, a liquid impermeable material) for proper operation. The backsheet of the wings may or may not be integral with the liquid impermeable backsheet of the absorbent core; the former version is preferred. Any material having special physical properties as described above for the backsheet 218 may be used as the backside of the wings.

The overall size of the wing 224 is readily determined by one of ordinary skill in the art. Preferably, sanitary napkin 210 has a width between the outermost edges of distal edges 278 and 278 'of about 10 to 23 cm and a length of flap 224 about 7.6 to 18 cm along the longitudinal axis of the sanitary napkin.

The outer surface of the wing 224 is coated with the wing glue 235 along the distal edges 278.

The wing adhesive 236 is an adhesive device which serves to keep the wing 234 in its position after folding around the edge of the leg portion of the pants. The wing adhesive 236 may be any adhesive such as that shown in FIG

The central pillow adhesive is described above. The wing adhesive 236 is also provided with a removable protective tape 238.

As shown in Figures 1 and 2, the top panel 214 is secured to the backsheet 218 along an edge 239. Edge 239 can be produced by any conventional method such as gluing, stapling or heat bonding.

The illustrated rim 239 completely surrounds the surface of the sanitary napkin 210; this is beneficial for simple construction. (Other different knitting devices may be used).

The topsheet 214 and the backsheet 218 are secured to each other along the bond lines 226 and 226 'in a similar manner to the edges 239.

Wing 224 includes first elastic axis 256 and second elastic axis 234. These two axes of elasticity allow the sash 224 to form a wall during use, as described below. The elastic axis can be formed by independent hinged lines or as a continuous region in the flap 224 which can be wound in any desired shape.

The first elastic axis 256 is formed so that the wing can bend along the first elastic axis 256. In the sanitary napkin 210 shown in FIG. 2, the flap folds upwardly. More generally, the ascent is directed to a

A portion of the flap 224 having a distal edge 278 from its generally initially extended position, as shown in Figure 2, toward the body-permeable fluid-permeable surface of the absorbent device around the first axis of elasticity 256 (as shown in FIG. top panel) and rotate away from the liquid impermeable surface of the absorbent device (as shown by the backsheet 216 of the absorbent core 216 in Figure 2).

The second elastic axis 234 is formed so that the wing can bend along the second elastic axis 234. With the sanitary napkin 210 shown in Figure 2, the fold is downward. More generally, the folding is such that the distal edge portion 278 of the flap 224 is in its generally originally extended position, as shown in Figure 2, toward the liquid impermeable surface of the absorbent device around the second elastic axis 234 (as shown in Figure 2). The backsheet portion 218 of the absorbent core 216 includes a central absorbent pad portion 212) and rotates away from the fluid-permeable body-contacting surface of the absorbent device as shown by the topsheet portion 214 of the absorbent core 216 shown in FIG.

The first and second elastic shafts can be formed by various methods. The preferred embodiments are shown in Figures 1 and 2. In the embodiments shown, the material used to form the 224 wings is extremely flexible throughout. The axes 256 and 234, as shown in Figures 1 and 2, are thus not single-line structures, but consist of a plurality of axle pairs. This arrangement is advantageous in that it allows for easy adjustment of the sanitary napkin 210 in use, and for adjustment to the various sizes of underwear and anatomical differences described below.

The full flexibility of the flap 224 allows the flap 224 to fit around the edge of the leg crotch without altering the natural passage formed by the leg portion of the pant. Thus, the leg leg of the pants does not have to be stretched to fit the wing to the second elastic axis.

The natural passage at the edges of the pant leg when using the sanitary napkin, as described below, forms the highest wall and thus serves as the greatest barrier to menstrual fluid.

In the embodiment of sanitary napkin 210 shown in Figures 1 and 2, the bending resistance of the wing fabric 224 as measured by a 90 ° bend gauge is preferably less than about 200 g, more preferably less than about 50 g, and most preferably less than about 25g The measurement was performed using a PCA Score Bending Measurer from Thwing-Albert Instrument Co., Philadelphia, Pa. These values are obtained when the wing section length is 67.6 cm (and this test equipment is · · · · · · · · · · · 2.5 cm from the bottom edge of your plate) and measure under standard conditions ΤΆΡΡΙ.

The axis is generally considered to be a linear element. The elastic elements described are also linear, but the material constituting the wings is generally so elastic that it can be folded and bent comfortably by hand, and the elastic axis can become nonlinear by external force.

As can be seen in Figure 1, the first axis of elasticity 256 is in close proximity to bond line 226. The first axis of elasticity 256 interrupts the bond line 226 at the point where the latter is in contact with the outer edge of the sanitary napkin (this outer edge being the edge 239). First elastic axis 256 and 226 generally only contact or meet in this case. However, it should be noted that external forces during use may move the first axis of elasticity toward the bonding line, so that the two may occasionally contact or meet.

A central absorbent pad comprising a top sheet, a backsheet, and an absorbent core disposed therebetween, and a wing extending from both longitudinal edges of the central absorbent core, a linear bonding line between the two wings and the absorbent pad. and the elastic shaft in the wing

the sanitary napkin should preferably bend at the longitudinal edge of • the wings and the central absorbent pad and the linear centreline of the elastic axis of the flap.

While such inserts may be very different from the inserts of the present invention, they may function in the same manner as the latter.

The shape of the wings 224 and the entire sanitary napkin 210 can be readily selected by one of ordinary skill in the art. Figures 1 and 3 show that the wings are symmetrical about the longitudinal axis of the sanitary napkin; however, arrangements other than this preferred embodiment are within the scope of the invention. As mentioned above, the wings are generally mirror images of one another; however, a structure other than this preferred embodiment is within the scope of the invention.

The sanitary napkin shown in Figures 1 and 2 is a variant in which the wings are integrated with the back of the sanitary napkin. This advantageous construction, however, is also within the scope of the invention. The wings and absorbent pads may be formed independently of one another and may be joined by a well known method to function substantially similarly to the embodiments of the invention described above.

Any well-known fastening means, such as a strap attached to the wearer's hips, may be used to fasten the sanitary napkins of the present invention for use. However, it is most advantageous to place the insert in the wearer's high cost as described below.

The type of trousers shown in FIG.

This underwear comprises a front portion 240, a back portion 242, and a leg portion. The leg portion 244 comprises two side edges 246 and 246 'and a

Contains 248 central sections.

The sanitary napkins of the invention, e.g.

The embodiments shown in Figures 1 and 2 are applied by removing the sanitary napkin 222, 238 as shown in Figure 9.

1 to 4, as shown in FIG. The center of the central absorbent pad 212 is the panties

We place it at 244 junctions so that 212 is central

Face the front 240 and the other end toward the back 242 of the undergarment and the rear panel 218

Contact the inner surface of the 248 foot portions.

The 220 central pad adhesive a

Holds 212 absorbent pads in place.

224 and

The distal portions of the 224 'wings are folded to the side edges 246 and 246' of the underwear so that the insert

234 and

234 'is bent along a second axis of elasticity. THE

Wing glues 236 and 236 'secure the wings 224 and 224 in this position. Each of the wings 224 and 224 'overlaps the corresponding portion of the garment, including the wings

246 and 246 '.

♦ ·· ·

The use of the sanitary napkin of the present invention has several advantages. The wings 224 and 224 'cover the edges 246 and 246' of the first leg leg 244, as shown in FIG. Such wrapping of the undergarment portion of the underwear can prevent the menstrual fluid from contacting and contaminating the middle of the undergarment portion.

There are also additional benefits. One is that

The second elastic axis 234 and 234 'wings provide a seal-like seal against the body. Another advantage is that the central absorbent device, such as central absorbent 212, is in continuous contact with the body.

The edges of the undergarment portion of the underwear are generally some elastic material. When wearing underwear, the elastic edge of the leg exerts an upward force against the body as a result of the elastic energy and the fit of the underwear. When the second elastic shaft, such as the elastic shafts 234 and 234 ', is positioned between the body and the undergarment portion, the edge of the undergarment portion exerts an upward force and presses wings containing the second elastic shafts comfortably toward the body. This results in a sealed seal between the wings and the body. This effect is illustrated in Figure 10; this figure shows a detail drawing of the crown worn in the underwear shown in Figure 8. (A crown • · * ························································

- Figure 22 is a front view that can be taken in the plane of the longitudinal axis of the body.) The sealing seal prevents the menstrual fluid from penetrating the second elastic axis, thereby minimizing contamination of the legs and adjacent clothing. A further advantage of the wings comfortably pressed along the second elastic axes is that the absorbent device (central absorbent pad) is conveniently located close to the wearer's body. Figure 10 also shows this. Such an arrangement of the central absorbent pad is referred to as "good contact with the body". Good contact with the body is advantageous because it prevents lateral flow of menstrual fluid. Without this limiting edge, the menstrual fluid would quickly run off the top plate and leave less time to absorb the fluid in the absorbent pad.

The degree of internal lumping that develops along the lateral axes of the sanitary napkin depends on the crease resulting from the initial insertion of the sanitary napkin into the pants. (The side axes of the sanitary napkin extend beyond the leg portion of the sanitary napkin and are generally shown in Figure 1.

2-2). This internal lumping results from the fact that the sanitary napkin is substantially linear along its longitudinal axis and that the contour of the body is substantially U-shaped when the sanitary napkin is placed.

(The longitudinal axis of the sanitary napkin extends from one end to the other of the central absorbent device and is generally perpendicular to line 2-2 of Figure 1). When the sanitary napkin is in place, the substantially linear shape changes to a U-shape along the longitudinal axis. This deformation produces creases along the lateral axes of the sanitary napkin, and most of the creases occur at the maximum curvature of the body, i.e., at the crotch.

Forced clumping is the crease caused by the wearer's foot movement along the longitudinal and lateral axes of the sanitary napkin.

Wrinkles, which are self-induced and induced by forced lumps, are known to create flowing channels, because in the absence of significant contact of the menstrual fluid with the body, it easily passes through the groove created by the crease.

The sanitary napkin of the present invention is characterized by a number of advantageous properties due to the presence of wings curved at the first elastic axis. These benefits include:

(1) flowing channels as a result of self-induced creases occur essentially only at the central absorbent pad and not at the wing area;

(2) the sanitary napkin of the present invention can withstand much more forced lumping than conventional devices prior to the formation of flowing channels;

(3) Even if the forced clumping is large enough to create flowing channels, their formation is essentially the ·· ·

- limited to the area around 24 absorbent pads; and (4) even if forced lumping is such that flowing channels are formed along both the central absorbent pad and the wings, the menstrual fluid does not pass through the second elastic axis of the wings.

The four advantageous properties of the sanitary napkins of the present invention described above are due to the fact that they are provided with boundary edges 107 or wall and that wall is curved along the axes of elasticity. The anatomical structure of the female limb body is essentially a trapezoid centered on the center of the limb at the vaginal opening. While wearing the sanitary napkin of the present invention as shown in Figures 1 or 2, the anatomical features of the leg compression force the sanitary napkin to curve upwardly at the first elastic axis. As a result, a wall forms on both sides of the central absorbent pad in the sanitary napkin; and this wall extends from the first axis of elasticity to the second as shown in Figure 10. This allows the sanitary napkin of the present invention to provide a good shape during use with the plane of the second elastic shafts (234 and 234 ') which, when upright, lies higher than the edge (234 and 234') of the underwear leg region. such as the plane formed by the first elastic axes (256 and 256 ').

The self-induced lumping of the sanitary napkin of the present invention is essentially the central absorber.

- limited to 25 cushions; there are no flowing channels in the walls. Without any particular theoretical discussion, it is assumed that when the flow channels are formed, the energy that generates them is also transmitted to the central absorbent pad and that the flow channels are enlarged. This continues until the flowing channels reach the first axis of elasticity. Flow channels are not further extended because it is assumed that the first elastic axes reduce the propagation of energy in the flow ducts, and thus the flow ducts do not achieve the sealing seal formed between the wing and body in the second elastic axis. thus, the insulation remains intact. The sealed insulation forms a barrier and prevents the flow of menstrual fluid. Thus, the menstrual fluid may be absorbed by the absorbent core.

The sanitary napkin of the present invention is resistant to greater forced lumping even before flowing channels, because the energy transmitted by the forced lining of the sanitary napkin causes the walls to rotate about the first axis of elasticity. Without this, the channels that would flow without turning would be formed.

If the forced clumping were strong enough to create flowing channels, they would be limited to the central absorbent pad. This is the same explanation as self-evolving lumping

• ♦ · '' ♦ • · * · · · »» »» »» »» »» csak csak csak csak csak csak csak csak csak csak csak csak csak csak csak csak csak csak csak csak is is As a result, the sealing seal remains intact, forming a barrier and preventing the menstrual fluid from flowing before being absorbed by the absorbent core.

If the forced clumping were large enough to create channels flowing in both the central absorbent core and the wings, the menstrual fluid would still not pass beyond the walls 107 and the second wings of the wings. These flowing ducts would be expected to break the seal. However, even in this case, the menstrual fluid would not penetrate further from the second axis of elasticity of the wings, since the walls themselves would obstruct the flow of menstrual fluid. In this case, the menstrual fluid would have to flow upwardly through the wall to hold the wearer upright, which would be essentially counteracted by the force of gravity to penetrate the seal. Thus, the walls themselves prevent the flow of menstrual fluid.

In summary, the sanitary napkins of the present invention are substantially free of flowing channels in the central absorbent pad and result in sealing seals remaining intact.

It is important to note that the glue 236 shown in Figure 10 is illustrated with the edge of the undergarment touching only its outer surface. The same procedure for attaching the sanitary napkin to the underwear is the same, ·· · · - ·. • 5 · · · · · · · · * ** * • · · · · · · · ·· _{··> (...}

however, the wing adhesive may be secured to the undergarment either on its inner surface or on both its inner and outer surfaces so that a portion of the wings extend over the edge of the undergarment.

The sanitary napkin of the present invention is a device comprising two wings forming a wall during use. This embodiment is preferred, however, such devices having no wings or only one wing are also within the scope of the present invention. In the single-wing version, the wing is connected to a central absorbent core along a non-linear bond line. The wing comprises at least two, preferably at least four, axes of elasticity which, when fully folded at the junction of the underwear, form a wall on each side. The flap is then attached to the central absorbent core by a non-linear bonding line opposite to that described above.

In one embodiment of the sanitary napkin of the present invention described and illustrated above, the adhesive means is disposed at the distal edges of the flaps and with the central absorbent core. These very advantageous elements are incorporated to secure the sanitary napkin to the underwear leg. Sanitary napkins which do not contain one or more of the above elements are also within the scope of the invention.

The variant shown in Figures 1 and 2 may be used even if one or more adhesive means are not included.

• ·· ·

Thus, for example, the sanitary napkin 210 shown in FIGS. 1 and 2 may omit the central cushion adhesive 220 (and, of course, the associated central cushion protective tape 222). When this modified version is used, the insert, like the unmodified version, is placed inside the underwear leg, but the central absorbent pad 220 is not secured to the inner portion of the underwear leg. The wings 224 and 224 'are secured with the flap 236 and 236' around the elastic edge of the underwear, as described above. The wearer will use the modified sanitary napkin underwear as described above. The wing adhesive 236 and 236 ', together with the elastic edges of the garment, hold the modified insert in place.

The sanitary napkin 210 may also be modified to omit the wing adhesive 236 and 236 '(and the protective tapes 238 and 238'). The sanitary napkin thus modified is secured with the central absorbent core adhesive 220 to the undergarment of the underwear and the wings are simply folded around the elastic edges.

Alternatively, remove all wing and central core adhesives. In this case, the modified insert will remain in place at the appropriate action of the wings, the elastic edges of the underwear, and the wearer's body.

Figure 3 shows a variant in which the top panel 40 comprises a central pad 105 and is folded over its own edge portions 103. The top sheet is 48 cores

has two layers fixed to one another by adhesive or ultrasonic bonding. The free edge 109 of the top panel wall 107 is located within the defined circumference of the upper portion of the absorbent core 48 as shown in Figure 1. An elastic member 77 is connected to the free edge 109.

In the variant shown in Figure 4, the walls 107 are formed by a backsheet 42 which is wrapped around the core 48 and connected to the top panel 40 at the upper portion of the core in the bonding areas 108.

In the embodiment shown in Fig. 5, the wall 107 is formed by a foam strip 100 located below the top panel of the core 48. This sanitary napkin is provided with wings 43 attached to the wearer's underwear, as shown in FIG.

6, the wall 107 is formed by a cantilever bracket 102 between the top panel 40 and the backsheet 42.

Figure 7 is a detail drawing showing the structure of the sanitary napkin of the present invention at the ankle when molded before being worn by the wearer (i.e., the sanitary napkin is subjected to elastic compression). The absorbent core 44 comprising the absorbent layer is completely surrounded by the first and second fabric layers 50 and 52, respectively. The absorbent core 44 is disposed between the topsheet 38 and the backsheet 42, and both the topsheet 38 and the backsheet 42 extend beyond the lateral edge 46 of the absorbent core 44 and thus form the flap 58. Adjacent areas 88 of the topsheet 38 and the backsheet 42 are glued together.

The boundary edges 62 shown are formed by attaching to the top panel 38 an element between the side edge 46 of the absorbent core 44 and the outer edge of the sash. The proximal edge 64 of the boundary edges 62 is formed by gluing the boundary edges 92 with the topsheet 38. The spacer elastic members 77 are locked in a tunnel, which occurs when the boundary edge members are folded back on themselves. The distal edge 66 of the boundary edges is held away by the elastic collection action of the elastic spacer members 77 from the top surface of the upper surface 40; Thus, channel 96 is formed by at least one proximal edge 64, distal edge 66, and inner surface 68 of boundary edges 62. The presented. The 96 channels thus easily retain, retain and store body fluids until the wearer 210 has been removed.

The topsheet 38 is comfortable to wear, soft to the touch, non-irritating to the wearer's skin, and fluid permeable so that the liquid can easily penetrate its entire thickness. It can be made from a variety of materials, such as porous foams, cross-linked foams, perforated films, natural fibers (e.g., wood or cotton fibers) or synthetic fibers (e.g., polyester or polypropylene fibers) or mixtures of natural and synthetic fibers. Preferably, the preparation is made of a hydrophobic material so as to separate the fluid from the absorbent core 44 from the wearer's skin.

A particularly preferred topsheet 38 is a so-called bundle length polypropylene fiber having a denier of about 1.5. An example of such material is Hercules Inc. of Wilmington. South. made by Hercules 151. As used herein, the term "staple length fibers" refers to fibers having a length of at least about 15.9 mm.

The topsheet 38 may be made by a variety of methods, such as weaving, nonweaving, twisting, or carding. A good process is carding and some known heat bonding. Preferably, the topsheet 38 has a weight of from about 18 to about 25 g / m ² , and has a minimum dry-machine machine bending strength of at least about 400 g / cm and a wet-measured transverse bending strength of at least about 55 g / cm 2.

The absorbent core 44 may be any generally compressible, comfortable, non-irritating device capable of absorbing and retaining body fluids. The preferred absorbent core is an opposed first and second side, an absorbent 48

layer and a first fabric layer 50 and a second fabric layer 52, respectively contain. The first and second fabric layers 50 and 52 are shown in FIG absorbent cover most of the seed, and so it is absorbent seed facing each other first and second

• · ·

The absorbent layer 48 is of various sizes and shapes, such as rectangular or watch glass, and forms the sides of such articles.

of a variety of materials commonly used in the production of, for example, blankets generally. Suitable cellulose wadding, absorbent materials, said crushed wood pulp include corrugated foams, absorbent foams, super absorbent polymers, or equivalent materials, and various mixtures thereof. However, the absorbent capacity of the absorbent layer 48 should be compatible with the amount of body fluid present in the sanitary napkin application area. In addition, the size and absorption capacity of the absorbent layer 48 must be adapted to the wearer.

The size, shape and arrangement of the absorbent layer 48 may also be varied; For example, the thickness, hydrophilicity gradient of the absorbent core, or the material may be a superabsorbent material or a synthetic fiber.

The first and second fabric layers 50 and 52 increase the flexural strength of the absorbent core 44 and reduce the tendency of the absorbent layer 48 to leak, shrink or curl when wetted. In addition, they facilitate the lateral absorption of absorbed body fluids, thereby providing a more efficient distribution of body fluids throughout the absorbent layer.

They can be prepared by a variety of methods;

paper tissue sheets with a basis weight of

«About 16 g / cm ² and air permeability 12.8 Pa (12.8 mm water column)

300.5m ² / m ² . At differential pressures 50 and 52, approximately first and second tissue layers 48 are also present.

the absorbent core is disposed on the backsheet 42 and is attached thereto by a binding device (not shown) formed by a well known method. Attachment of the absorbent core 44 to the backsheet 42 may be accomplished, for example, by uniformly continuous gluing or by separate glue lines or spots. A suitable adhesive is

Eastman Chemical Products of Kingsport, Tenn.

brand,

Eastbond A-3 is a trade name.

is preferably made from a thin plastic film, but other flexible liquid impermeable materials may also be used. The backsheet 42 prevents the body fluid absorbed and retained in the absorbent core from wetting materials that contact the sanitary napkin, such as undergarments. Preferably, the backsheet 42 is a polyethylene film having a thickness of about 0.012 mm to 0.051 mm, but other flexible, liquid impervious materials may be used. The term "flexible expression" used herein refers to materials which can be conveniently applied and well adapted to the normal shape and contours of the human body.

Such a suitable polyethylene film is commercially available from Monsanto Chemical Corp.,

Movie No. 8020 under the trade name.

The backsheet 42 may also be embossed or matted for a more linen-like appearance. It allows vapors from the core to pass through, and body fluids do not penetrate.

Any suitable method of attaching the topsheet 38 to the backsheet 42 may be used. As used herein, the term interconnection is used to design elements in which the topsheet 38 is directly attached to the backsheet 43 such that the topsheet 38 is directly attached to the backsheet 42 or wherein the topsheet 38 is indirectly coupled to the backsheet 42 such that secured to the intermediate member and secured to the backsheet 42. In a preferred embodiment, the topsheet 38 and the backsheet 42 are directly connected to one another circumferentially by adhesive 88 or other known coupling means. For example, a uniformly continuous adhesive layer, adhesive pattern, or separate adhesive arrows or spots may be used. The side flaps 58 must be very flexible.

The side wings 58 extend between the periphery and the edges of the absorbent core 44. Accordingly, in the version of the sanitary napkins of the present invention shown in Figure 7, the flaps 58 are formed by extending the backsheet 42 and the top panel 38 along the side edges 46 of the absorbent core 44.

The boundary edges 62 each comprise a proximal edge 64, a distal edge 66, an inner surface 68, and an outer surface 70. As used herein, the term "flexible" refers to materials that are comfortable and easily adapted to the normal shape and contours of the body. In addition, if the spacer 76 includes a resilient spacer 77, the boundary edges 62 must be sufficiently compressible such that the distal edges 66 are sufficiently spaced from the top surface 40 of the top plate to accommodate the formed channels 96 and keep body fluids. The boundary edges 62 may be made of a variety of materials, such as polyester, rayon, nylon, foams, plastic foils, molded foils, or flexible foams. The preparation can be carried out in a variety of ways. For example, it can be made from woven, nonwoven or carded materials. Particularly preferred are the boundary edges 62 formed without surface finishing or by liquid impermeable treatment. For example, Celestra from Crown Zellerbach Company is particularly suitable.

Figure 7 shows that the boundary edges 62, and in particular the near edge 64, are located on the inner surface and preferably near the wing.

The term inner surface, as used herein, refers to a surface extending in the direction of a centerline 36 parallel to the edges 226 and 226 'of the respective boundary 62.

The boundary edges 62 are used to better prevent the flow of body fluids. The boundary edges 62 are preferably disposed between the outer edge of the sash and the longitudinal centerline 36 of the sanitary napkin.

The proximal edge 64 and the distal edge 66 are positioned relative to one another so as to define the width of the boundary edges 62. The proximal and distal edges 64 may be parallel to each other, not parallel, bounded by straight lines or converging lines. In addition, the cross-sections of the boundary edges 62 may take a variety of shapes, such as circular, square, rectangular, and other shapes. Preferably, the proximal edge 64 and the distal edge 66 extend along parallel lines that provide a uniform width to the boundary edges 62.

In the version of the sanitary napkin of the present invention shown in Figure 7, the boundary edges 62 engage the upper panel 38. The term "connected" refers to any method that allows the boundary edges 62 to be secured to a sanitary napkin, and includes solutions whereby the proximal edge 64 of the boundary edges 62, which are incorporated as a separate element, directly or indirectly engages the top panel (i.e., or solutions that make the boundary 62 the same element or material,

3Ί like the topsheet 38, so that the near edge 64 forms a continuous, undivided (i.e., uniform) member with the topsheet. The boundary edges 62 may also engage the flap 58, the backsheet 42, the absorbent core 44, or any member of the sanitary napkin. In the embodiment of the invention shown in Figure 2, the integral boundary edges 62 are formed of a single web material and secured to the top panel by adhesive 92, and the distal edge 66 is formed by folding the back of the material by itself.

Preferably, the distal edge 66 is positioned within the proximal edge 64 to more effectively prevent fluid flow. The distal edge 66 is held by the adhesive 78 within the proximal edge 64 to prevent it from turning.

While the distal edge 66 may be positioned in a position other than the proximal edge 64, these are not preferred.

Preferably, the distal edge 66 is not fixed at least at the center of the sanitary napkin so as to keep the upper surface of the backsheet 38 away.

Preferably, the distal edge 66 is spaced so far away from the upper surface 40 of the topsheet 38 that the boundary edge 62 provides 96 channels to increase the content of the article. The offshore term refers to variants wherein the distal edges 66 are one or more position, including a position adjacent to the top surface 40 of the sheet. The distance of the distal edge 66 from the upper surface 40 of the top panel 38 is in the case where the distal edge 66 is at its farthest (i.e., in a contracted state) edge and the closest portion of the top panel is straight. The preferred height is at least about

from a possible , a 6 6 remote between drawn sheet to mm and more

more preferably about 2 to 5 mm.

The channel 96 is formed along at least the inner surface 68 of the proximal and distal edges 64 and the boundary edges 62. The channel 96 prevents the flow of body fluids towards the topsheet 38.

The boundary edges 62 may also be provided with absorbent means fixed to or within the boundary edges 62. This absorbent device is intended to absorb and retain body fluids in contact with the boundary edges 62. The absorbent device can be any device capable of absorbing and holding liquids, and may vary in size, shape, arrangement, or absorbent capacity. The absorbent device may be disposed along the inner surface 68 of the boundary edges 62 or within the boundary edges 62. Preferably, the absorbent device is an air felt layer which is secured in a tunnel formed by the integral boundary edges and extends over the entire length and width of the inner surface 68 of the boundary edges 62.

The boundary edges 62 may also be impermeable to prevent the penetration of body fluids. Liquid impermeable stop 62

edges prevent fluid from moving through boundary edges 62 and thus allow greater leakage resistance. Liquid impermeability of the boundary edges 62 may be accomplished by any suitable method, such as by selective treatment of the boundary edges or by attaching any separate material to the boundary edges.

The spacer 76 for keeping the distal edge 66 from the upper surface 40 of the top panel may be any element that holds or contracts the boundary edges 62, stiffens, shortens or otherwise influences to form a channel 96 along the boundary edges 62, and prevents leakage.

Figure 7 shows that the spacer 76 comprises a resilient member 77 which is fixed adjacent the distal edge 66 of the boundary edges 62. Preferably, the spacer elastic member 77 is secured to the boundary edges 62 in a collapsible position such that, in normal position, the spacer elastic member 77 effectively contracts or holds the boundary edges 62 together.

Figure 7 shows that the spacer member 77 is connected to the boundary edges 62 by securing it within the boundary edges by means of a flexible coupling device 94. While the spacer elastic member 77 may be secured to the boundary edges, it may be provided adjacent to only one end of the spacer elastic member 77, but it is preferred that the entire length of the spacer elastic member 77 be secured to the boundary edges. Preferably, the flexible coupling device 94 may be a hot melt adhesive made of glue bead; an example of such an adhesive is Adhesives Incorporated, Wis., under the tradename Adhesives 581.

The spacer member 77 may, for example, be a 0.18 mm x

Elastic yarn of natural rubber with a cross-section of 1.5 mm. Such a rubber is sold under the tradename L-1900 Rubber Compound by Rubber Co., AA. The spacer 77 is also useful as a flexible member, for example, in the Company of Scotland, N.C. elastic tape manufactured by trade name 9211; or a heat shrinkable flexible material commonly used as such; or other well-known material such as foil, polyurethane foam, foam or molded elastic material.

The spacer member 77 may have a variety of configurations. Thus, for example, the width of the spacer elastic member 77 can be varied, or it can be made from a single elastic yarn or parallel or non-parallel elastic yarns; either in the form of straight contours or curved contours. There are also a number of known methods for attaching the spacer member 77 to the boundary edges 62. For example, the spacer elastic member 77 may be bonded or thermally bonded to the boundary edges 62, or simply glued, using a variety of bonding patterns.

The spacer element 76 for holding the distal edge 66 away from the upper surface 40 may also include additional members. For example, each of the boundary edges 62 may also include stiffening means fixed therein or therethrough. The stiffening means must be so stiff that the distal edges 66 are kept away from the upper surface of the topsheet 40. Suitable fasteners include foams, fabrics, cotton wools, molded polyethylene foils, spray adhesives, foamed polyesters, or high-hole materials made by Carolina Formed Fabrics.

The spacer means 77 may also include means for shortening the distal edges 66 relative to the length of the sanitary napkin edge. The short edges 66 may be shortened by folding or wrinkling the distal edge.

Folding or creasing may be secured by well known means such as gluing or heat bonding.

By cutting a piece of the distant wind, you can also extend or join edges.

it is also possible to shorten the distal edges by longitudinally connecting the distal edge to the topsheet 38 in a position different from that of the sanitary napkin when extended. Other known shortening methods may also be used.

The adhesive means used to secure the end portion of the boundary edges 62 secures this portion close to the side edges of the sanitary napkin; Thus, the sanitary napkin is more conveniently fitted to the wearer and the distal edges 66 of the boundary edges 62 are prevented from rotating during use and use. The bounce generally means that the distal edges 66 inside are turned outward when applied to the wearer. In a preferred embodiment of the invention, such adhesive means are provided on the front and back of the sanitary napkin. The rest of the boundary edges 62 are not locked, so that the distal edges 66 remain free.

Preferably, the hot melt melt adhesive made from adhesive beads marketed under the tradename Adhesives 581 by Adhesives Inc., Wis., Is used as the adhesive device 78.

Claims (13)

Claims 1. Sanitary napkin with the following structure: an absorbent core comprising a first surface, a second surface, and a circumferential portion comprising two longitudinal sides and two lateral sides; - an upper plate lying on the first surface of the core; - a liquid impermeable backsheet located on the second surface of the core and connected to the upper panel; and - boundary edges along longitudinal sides, generally intended to limit the migration of fluid migration parallel to the lateral sides, characterized in that the boundary edges comprise a wall with a free edge protruding from the plane of the first surface of the core and the free edge at least is located within the perimeter of the core when using the insert. The sanitary napkin of claim 1, wherein the backsheet extends beyond the core circumference during use to form lingerie wings, and the wall forming the boundary edges engages adjacent wings adjacent to the core circumference. 3. Sanitary napkin with the following structure: - an absorbent core which is a first surface, a second> ΐ. · “. ·········· · · · · · · · · · · · · · · · · · · · · · · · · · í: ··: - ··· ·· «·.« · ... a surface and a peripheral portion consisting of two longitudinal sides and two lateral sides; - a topsheet lying on the first surface of the core; - a liquid impermeable backsheet located on the second surface of the core and connected to the upper panel; and - boundary edges along the longitudinal sides, which generally serve to limit the migration of fluid migration parallel to the lateral sides, characterized in that the backsheet extends over the core circumference during use, and the wall forming the boundary edges is adjacent to the core circumference; linked to wings. The sanitary napkin according to claim 1, 2 or 3, characterized in that the wall is formed by a spacer element between the top plate and the backsheet. The sanitary napkin of claim 4, wherein the spacer member is a cantilever tape. 6. The sanitary napkin of claim 1 wherein said spacer member is disposed between said topsheet and said core. 7. The sanitary napkin of claim 6, wherein the spacer member is a foam web. 8. A sanitary napkin according to any one of claims 1 to 3, characterized in that the boundary edges also include the topsheet and the topsheet comprises a central portion lying on the core and wall portions forming a wall along the longitudinal sides of the core. A sanitary napkin according to claim 8, characterized in that the edges of the topsheet are located along the side portions of the core. 10. A sanitary napkin according to any one of claims 1 to 3, characterized in that the boundary edges also include a backsheet. A sanitary napkin according to any one of claims 1, 2, 3, 8, 9 or 10, characterized in that the free edge of the wall of the boundary edges is provided with a shrinkable device. The sanitary napkin of claim 11, wherein the contraction device comprises a resilient member. 13. The sanitary napkin of claim 11, wherein the contraction device is formed by shortening the free edge by stapling.