KR950001517Y1 - Undispositive absorbent - Google Patents

Abstract

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Description

Non-closing, liquid impermeable composite back sheet for absorbent products

1 is a perspective view of a sanitary napkin using the composite back sheet according to the present invention,

2 is a cross-sectional view of the sanitary napkin shown in FIG. 1 along the cutting line 2-2 of FIG.

FIG. 2a is a cross-sectional view of another sanitary napkin of the type shown generally in FIG. 1 at a point corresponding to cut line 2-2 in FIG.

FIG. 3 is generally similar to FIG. 2A but illustrates the shape of the sanitary napkin corresponding to the wearer's pelvis and the contact state between the innermost face of the wearer's thigh and the outermost face of the composite back sheet according to the present invention. to be.

The present invention generally relates to absorbent products such as disposable diapers, sanitary napkins, disposable bedpads, incontinence pads.

The present invention particularly relates to a backing material for an absorbent product which gives a very desirable tactile feel to its exposed surface, which prevents the liquid absorbed in the absorbent product from leaking to the back side of the absorbent product and is also substantially in contact with the skin. By preventing the part from closing the wearer's skin, the fit is improved.

Absorbent products such as diapers, sanitary napkins, disposable bed pads, incontinence pads are known. These products are used to absorb liquids from the human body and retain them. It is also known to cover the exterior of the absorbent article with a flexible plastic sheet that prevents the absorbed liquid from leaking out of the absorbent article and contaminating other adjacent garments such as bedding and clothing. While such waterproof plastic sheets of the prior art are very effective in preventing leakage and incorporating liquid in absorbent products, these waterproof plastic sheets also tend to be inconvenient to wear. Therefore, many prior art techniques have been attempted to provide such absorbent backsheets, i.e., backsheets which only block the passage of liquid moisture and which permeate gas and vapor to some extent.

The purpose of this breathable backsheet according to the prior art is to provide a communication between the inside of the absorbent product and the outside of the absorbent product, so that the absorbed liquid is evaporated into the atmosphere and air is circulated between the inside and the outside of the absorbent product.

Examples of such prior art absorbent articles using breathable backsheets are described in US Pat. No. 3,989,867, issued to Sisson on 2 November 1976 and assigned to the applicant; United States Patent No. 3,156,242 issued to Crow, Jr. on November 10, 1964; US Patent No. 2,119,610, issued to Tasker on June 7, 1938; United States Patent No. 3,439,678 to Thomas, dated April 22, 1969; And US Patent No. 4,341,216, issued to obenour on July 27, 1982, to Applicant, all of which are incorporated herein by reference.

The above-mentioned Oben Hour patent discloses a disposable diaper comprising a two-material breathable back sheet. These two materials are relatively liquid impermeable and vapor permeable outer sheets and liquid impermeable inner panels. The inner panel is located between the outer sheet and the absorbent core of the product in the crotch portion of the disposable diaper. The relatively liquid impermeable outer panels described in Oven Hour's patent are tapered capillary forms as described in US Pat. It consists of a polymeric film which shows The outer panel is arranged such that the direction of the liquid impermeability is directed from the absorbent core to the outer surface of the diaper. This means that in the illustrated embodiment, the taper capillary peaks of the outer sheet are oriented towards the absorption core.

Oben Hour's main issue in the product structure according to the prior art is to provide breathability between the atmosphere around the back sheet exposed in disposable diapers and the moisture absorption of the product.

Because of the wide range of conditions encountered in use, prior art absorbent products using breathable backsheets that allow only limited traffic between the atmosphere and the absorbent material around the backsheet have not always worked in the intended manner. For example, if the absorbent product's pressure rises above normal pressure due to the wearer's movement or activity, liquid will leak out of the breathable backsheet, thereby wetting the wearer's surrounding garments.

Another prior art for improving fit and maintaining liquid impermeability between absorbent material and ambient air has studied how to add a wearer contact layer outside of the water impermeable backing layer used to contain the liquid. One such layer of structure is described in US Pat. No. 4,200,103, issued April 29, 1980 to Black et al., Which is incorporated herein by reference.

Black et al. Describe absorbent products for absorbing and retaining body fluids. Such absorbent articles have a body contact surface and a garment contact surface, and include an elongated planar absorbent pad. The absorbent pad is surrounded by a generally rectangular menstrual permeable sheath, which overlies the garment contact surface of the product and has longitudinal edges. Generally rectangular menstrual impermeable blocking sites are inserted between the sheath and the pad.

The blocking sheet is placed on the garment contact surface of the pad and at least on the longitudinal edge of the pad. At least two menstrual block sutures extend in the longitudinal direction of the product to suture the longitudinal edge of the blocking site against the cover. Longitudinal sutures prevent the menstrual fluid from moving across the suture line by wicking or by seeping, while the menstrual fluid impermeable barrier sheet prevents any absorbed secretion from leaking. In the invention of Black et al., In a particularly preferred embodiment a pocket is formed between the barrier sheet and the sheath overlying it. According to Black et al., This pocket area is opened to allow free circulation of water and air on both the inner and outer surfaces of the skin, so that the sweat deposited on the longitudinal edges of the pads can be transferred to the product before irritating the user's skin. Can be evaporated and removed.

The menstrual permeable sheath described in the patent of Black et al., In a preferred embodiment, prevents menstrual fluid uptake to the outermost surface of the pad by the longitudinal blocking sutures and is composed of a substantially planar fibrous material. When the pad described in Black et al. Is under pressure, the contact skin causes the outermost pee to contact the underlying menstrual impermeable barrier layer. Therefore, in a situation where the sheath is constantly pressurized, a pocket formed between the sheath and the barrier layer cannot be possible at the site where the sheath is continuously pressurized. In other words, the air circulation between the pressurized wearer's body part and the barrier layer should be provided through a substantially planar envelope material. If the nearly planar fibrous skin material described by Black et al. Does not provide sufficient separation between the wearer's skin and the barrier layer of the pad to allow significant air circulation between the wearer's skin and the barrier layer, an antiperspirant action at that interface This can happen, and as a result the wearer becomes uncomfortable.

It is therefore an object of the present invention to provide a composite back sheet comprising an outermost layer of a liquid permeable wearer contact layer and an almost inner liquid impermeable innermost barrier layer, wherein the composite backsheet is formed of the wearer's skin and the composite backsheet. The ability to circulate air between the liquid impermeable barrier layers is suitable for use in absorbent articles that do not depend on the formation of pockets between the wearer contact layer and the barrier layer.

Another object of the present invention is an elastic non-absorbable polymeric outermost material which can provide continuous air circulation between the wearer's skin and the lower barrier layer even when the absorbent article using the back sheet is subjected to atmospheric pressure by the physical movement of the wearer. It is to provide a composite back sheet comprising a layer.

Another object of the present invention is to provide a composite back sheet having a soft wearer contact surface which is generally preferred by consumers because it gives a silky feel compared to the woven and nonwoven fabrics of the prior art, which are typically used for contact surfaces with a user's skin. It is.

Another object of the present invention is a composite back sheet comprising a wearer contact polymer layer having a plurality of protrusions with a small depression that minimizes the contact and frictional forces of the wearer's skin when the backsheet and the wearer's skin move relatively. This often reduces the sticking phenomenon that occurs when the back sheet does not move relatively easily with respect to the wearer's skin.

Another object of the present invention is to provide a composite back sheet that does not make a rustling sound that occurs when the wearer moves and embarrasses the wearer.

Another object of the present invention is to provide a method for producing the composite back sheet.

In a particularly preferred embodiment, the present invention comprises an absorbent material comprising a composite backsheet which is liquid impermeable but aesthetically and tactilely satisfactory. The composite back sheet preferably includes the outermost polymeric web as the first layer, including a plurality of small elastic projections with volcanic depressions at each vertex. The projections of the polymeric web are externally oriented, whereby volcanic depressions are placed in contact with the wearer's skin. The innermost layer, as a second layer of substantially liquid impermeable material, for example, a polymeric membrane of another layer, prevents the liquid absorbed in the absorbent article from penetrating the composite back sheet. The liquid impermeable innermost layer may optionally be vapor permeable, but this is not a requirement of the present invention. The portion of the composite back sheet in contact with the wearer's skin is non-pulmonary because air circulation easily occurs between the outermost and innermost layers of the backsheet. Also, since the outermost web has a very small surface area in contact with the skin, there is little tendency for the two to stick together when the outermost layer and the wearer's skin move relatively. As a result, it is thought that the composite back sheet of the present invention will not generally stick. In other words, when the wearer's body moves relative to the back sheet of the absorbent article, the back sheet is hardly inclined to pull on the skin. Small volcano-shaped depressions are believed to represent small feathery edges that slide easily across the surface of the skin, rather than sticking to it, thereby leading to the generally indented feeling that accompanies the wearer's body as it moves. Substantially reduced compared to the polymeric web of the art.

It was unexpectedly found that the rustling sound typically generated by the recessless polymeric backsheet according to the prior art is not also caused by the composite backsheet of the present invention. This can be quite important for products such as adult incontinence briefs that produce a rustling sound that can be very embarrassing for the wearer.

In a particularly preferred embodiment of the present invention, the almost liquid impermeable innermost layer consists of a very thin polymeric membrane that is soft and easy to handle to prevent liquid transfer but to make no noise when the wearer's body moves. However, the nearly liquid impermeable layer may, if desired, be vapor permeable. This layer may be attached to or beneath the polymeric outermost layer where the fine depressions of the composite back sheet are present. In another embodiment of the present invention, it may take the form of a coating applied almost continuously to the opposite surface of the volcanic peak where the fine depressions are present.

Thus, the back sheet of the present invention provides the highly desirable liquid impermeability that is characteristic of the polymeric membrane back sheet of the prior art, along with the desirable tactile and aesthetic properties previously provided only for fibrous woven and nonwoven structures. In addition, the composite back sheet of the present invention often improves the fit at the point of contact without making a sound that may be difficult for the wearer.

1 is a perspective view of a sanitary napkin 10 using the composite back sheet 19 of the present invention. Although the absorbent article described in detail herein is in the form of a sanitary napkin, one skilled in the art should understand that the general principles of the present invention and its applicability to other absorbent or apparel products thereof may be readily appreciated. In addition, the term "back sheet" is not limited to any particular surface of the absorbent article. For example, the edges of the back sheet may in some cases be folded and folded to form part of the appearance of the absorbent article, such as in disposable diaper waist bands, disposable diaper leg bands, and the like.

Therefore, the present invention is not intended to limit its use only as a particularly preferred back sheet material in a sanitary napkin, and the scope of the present invention is described in detail in the appended utility model registration claims.

The sanitary napkin 10 shown in FIG. 1 is an almost hourglass shaped sanitary napkin that allows for easy placement between the wearer's legs without twisting. Sanitary napkins of the type shown in FIG. 1 are often used as panty liners, for example by the well-known means such as pressure-sensitive adhesive tape (not shown) on the bottom surface of the sanitary napkin. Can be attached to The sanitary napkin 10 is an ideal fluid permeable top sheet that allows menstrual fluid or other body fluids deposited on the top surface of the structure to pass through the top sheet 15 and then be retained by the absorbent material 30 located directly below the top sheet. It is preferable to contain 15).

One of the particularly preferred top sheet materials consists of a macroscopically expanded three-dimensional polymeric web, having a plurality of capillary networks 17, each consisting of a plurality of interconnected fibrous materials, exhibiting a fibrous appearance and feel. This general type of structure is described in US Pat. No. 4,342,314, issued August 3, 1982 to Radel and Thompson, which is incorporated herein by reference. Of course, it will be appreciated that the particular type of upper sheet is not critical to the practice of the present invention, but can be readily manufactured from more conventional materials such as woven and nonwoven fabrics.

The absorbent material 30 may be made of any known absorbent material, such as wood pulp fibers ground by airaid, commonly known as airfelt. The absorbent material 30 may also consist of plies of tissue paper, absorbent foam or a combination of the foregoing materials. The exact composition and structure of the absorbent material 30 is also not critical to the practice of the present invention.

In the embodiment shown in FIG. 1, the absorbent material 30 is preferably an absorbent material in the form of an hourglass. In a particularly preferred embodiment, the perimeter of the absorbent material 30 is in the same space as the rim of the upper sheet 15. Under the absorbent material 30 is preferably provided the liquid impermeable composite back sheet 19 of the present invention. As can be seen in the cross-sectional views of FIGS. 1 and 2, the composite back sheet 19 consists of an innermost layer 25 and an outermost layer 20. In addition, as observed in FIGS. 1 and 2, the layers 20 and 25 of the composite back sheet 19, the middle edges of the absorbent material 30 and the upper sheet 15 are formed around the sanitary napkin 10. It is attached to each other in the sealing region 35 forming the periphery. The combined sealing region 35 may be manufactured with or without peripheral edges of the absorbent material 30 attached between the layers. Suture region 35 may be continuously coupled around the periphery of the sanitary napkin, or may be partially coupled at regular or non-uniform intervals. Any suitable means well known in the art can be used to attach the various layers to one another, including, for example, using a relatively flexible adhesive that mediates the various layers. Of course, it is generally desirable to keep the edges of the suture area 35 soft so as not to scratch the wearer's skin.

Since layers 20 and 25 are superimposed around the periphery of sanitary napkin 10, there is no need to attach layers 20 and 25 to each other at other locations along the bottom surface of the sanitary napkin.

In a particularly preferred embodiment, the innermost layer 25 of the composite backsheet 19 preferably consists of a nearly liquid and vapor impermeable polymeric membrane, such as polyethylene having a thickness of preferably from about 0.0002 to about 0.0008 in. . In the case of very thin membranes, particularly when operating at high speeds, it may be desirable to extrude the innermost layer over the outermost layer 20 where the depression is present. In addition, in the practice of the present invention, a material which is almost liquid impermeable but vapor permeable may be used. One such material is a porous polytetrafluoroethylene web, such as PLASTORON, product of Garlock, Inc., Newtown, Pa., USA. However, such liquid impermeable but vapor permeable materials are generally more expensive than polymeric membranes that are liquid and vapor impermeable.

Since the liquid impermeable layer 25 generally does not need to resist significant mechanical forces, such as the tension applied to the absorbent article, this material does not generate a sound every time the wearer's body moves due to its presence. It is generally chosen to be as thin as practical and as easy to handle as possible. Materials with low modulus of elasticity are generally preferred because they tend to produce less sound.

The outermost layer of the composite backsheet 19 preferably consists of a second layer of polymeric membrane with a relatively small number of elastic protrusions 21 with small depressions 22 present at the apex. As can be seen in the cross-sectional view of FIG. 2, the layer 20 is externally oriented with projections farther away from the water impermeable layer 25. As a result, the small depression 22 at the apex of the protrusion 21 has a small volcanic peak 23 that can be in contact with the wearer's skin when the wearer wears the sanitary napkin 10. The protrusions 21 support microscale structures, such as 80 filaments / in × 80 filaments / in woven wire mesh, consisting of 7 mil filaments with fluid differential pressure on a nearly planar polymeric membrane. Can be produced. The projections in which the depressions created in this way correspond to the graduations created between the crossed filaments.

In order to provide the visual and tactile benefits described herein, it is generally desirable to use a wire mesh count of at least about 80 / in × 80 / in. As the mesh count increases, it is desirable for the filament diameter to decrease. A more detailed description of particularly preferred size and spacing criteria for a number of protrusions is described by John J. Curro and E. Kelly Linman, in which the presence of the "soft and silky fine depressions coexisted with the present invention. The polymeric web "is described in United States Patent Application (Attorney's Docket No. 3406), which is incorporated herein by reference.

While it is believed that the backsheet of an absorbent product, such as a sanitary napkin, is not generally in extensive contact with the wearer's skin, it should be noted that when using the product, the external surface of the absorbent product is often in contact with the wearer's skin. In particular, when a woman wears a sanitary napkin, the outer surface of the pad may be adapted to the user's pelvis so that the innermost face of the thigh may be in substantial contact with the outermost face of the pad. This condition is generally illustrated in the cross-sectional view of FIG. 3, which illustrates the mode of use of another sanitary napkin 10 '.

Skin contact is also noted in many cases, including adult incontinence briefs, infant diapers, and related structures that, when in contact with the wearer's blood, form a sealing area that prevents leakage over the edges of the absorbent product when contacted with the wearer's blood. Similar to

Although not necessarily so, it is believed that the contact properties between the composite back sheet of the present invention and the wearer's skin will make the wearer feel that the absorbent product according to the invention is more comfortable and will not stick. In particular, the small volcanic peak 23 located at the apex of each projection 21 has a very small contact area with the user's skin. Since the outermost web is elastic, each time the pressure 21 is removed from the web sufficient to temporarily collapse the protrusion, the protrusion 21 rises again to circulate air back to the skin. In contrast, inelastic plastic backing sheets without the prior art depressions tend to have a large contact area with the wearer's skin. The large contact area of the polymeric membrane tends to close the skin and thus cause perspiration, resulting in the skin sticking to this prior art backsheet, so that the wearer's body and backsheet move relatively when the wearer moves. If there is a tendency to pull on the wearer's skin. Also, because most of these webs are nearly planar and lack elasticity, once they are in contact they do not separate from the wearer's skin at least until the wearer moves. The disadvantageous "sticking phenomenon" often referred to in the prior art liquid impervious back sheet is caused by the tendency of the skin and back sheet material to come into contact with each other when the two surfaces of the skin and the back sheet material move relatively.

The skin is pulled by the relative movement as described above when the wearer's body is moved enough to separate between the wearer's body portion affected by this relative movement and the back sheet portion where the body portion is temporarily attached. This is one of the important reasons why prior art polymeric backsheets without depressions do not get a good response to the consumer.

Another advantage provided by the composite backsheet 19 of the present invention is that the associated relatively small volcanic peak 23 of the depression 22 does not significantly close the wearer's skin. The shape of the protrusions 21 circulates air continuously between the innermost layer 25 and the outermost layer 20 of the composite back sheet 19.

Unlike prior art structures, such as those described in Black et al., Such continuous air circulation is mediated by the liquid impermeable innermost layer 25 and other mediating the outermost layer 20 where the depression is present. It does not depend on the formation of structural films or pockets. Thus, this is independent of the composition of the final product.

Since the air circulation is improved, it is thought that the tendency of the user's skin to sweat is reduced. In addition, both the reduction of the contact area and the reduction of sweating are believed to minimize the sticking of the wearer's skin to the back sheet. As a result, the tendency of the wearer's skin to be pulled by the relative movement between the wearer's skin and the composite backsheet according to the present invention is much reduced.

Another preferred embodiment of the sanitary napkin 10 ′ according to the present invention is shown in the cross sectional view of FIG. 2A. The sanitary napkin 10 'shown in FIG. 2a uses a three dimensional outermost layer 20' that is expanded macroscopically than the outermost layer 20, where the composite backsheet 19 'of the present invention is substantially planar. In most respects, it is similar to the sanitary napkin 10 shown in FIG. The outermost layer 20 'is generally similar to the outermost layer 20 except that it is expanded macroscopically to have a number of debossings 24 that increase its overall thickness. In some cases, the debossed portion 24 may also be manufactured with depressions 27 having a macroscopic cross section at the end of each debossed portion 24. In the web embodiment 20 ′ shown in FIGS. 2 and 3, the projection 21 comprising a small depression 22 located at its apex and a volcanic peak 23 is a macroscopically expanded three-dimensional feature. It is present on the surface of the web 20 'at substantially even intervals. The debossed portion 24 present in the layer 20 'of the composite back sheet 19' provides a much greater sense of elasticity to the web 20 'when the outer surface of the sanitary napkin 10' is in contact with the wearer. Provide the web with a three-dimensional macroscopic cross section to impart. In addition, since the total thickness of the three-dimensional layer 20 'expanded macroscopically is larger and there is a recess 27 having a macroscopic cross section at the end of the debossed portion 24, the liquid impermeable intermediate layer 25 and the first There is much more space for air to circulate to the outer layer 20 '. This is specifically explained by the arrow "A" shown in the cross-sectional view of FIG. 3, which illustrates the case where a sanitary napkin 10 'of the type shown in FIG. 2A is used.

As can be seen from the third, even when the thighs of the wearer pressurize the elastic part of the outermost layer 20 'with which they are in contact, the small protrusion 21 having the depression 22 at the apex is Prevents the wearer's skin from closing completely. In addition, when the body of the wearer is moved by walking, the outermost layer 20 'in contact with the wearer's thigh is formed with a small volcanic peak 23 formed around each small depression 22. Because it does not stick, it easily crosses the skin surface.

Thus, while the prior art methods have mostly attempted to solve the problem of "sticking phenomenon" by simply providing a backsheet that only passes vapor and prevents liquid transfer from the absorbent material to the backsheet, Composite backsheets are not apparent but are thought to solve a number of previous problems due to the lack of breathability between absorbent material and ambient air in a novel way. In particular, the solution provided by the present invention has safety associated with the liquid impermeable back sheet of the prior art. However, the solution of the present invention eliminates the problem of "sticking" and at the same time provides a visually and tactilely desirable appearance and organization on the outermost side of the back sheet, thereby providing a general negative response from the consumer to the back sheet of the prior art. Remove it.

Particularly preferred methods of making the outermost layers 20 and 20 'of the composite backsheets 19 and 19', respectively, are Kuro, James C. Baird, Donald L. Gerth, Vernon By "M. Vernon and E. Kelly Linman," a multi-step process for debossing and perforating polymeric webs to produce a shape with one or more three-dimensional shaped structures, filed and assigned identically to this application. It is shown in FIG. 1 of the name of the United States Patent Application (Attorney's Doket No. 3402), which is incorporated herein by reference.

Webs with fine depressions, such as web 20, can be formed by treating a substantially planar web of polymeric film as the first step of the multi-step molding process described in the patent application. Alternatively, microscopic depressions such as web 20 'and macroscopically expanded three-dimensional webs may be used to provide polymeric membranes to the above-mentioned US Patent Application Attorney's Docket No. 3402 may be processed and molded in two steps of the multi-step process shown in FIG. Particularly preferred features for wearer contact webs, such as (20) and (20 '), are described by Curro and Linman in the same application as the "Flexible, silky, tactile fines." Polymeric webs with depressions are described in detail in Attorney's Docket No. 3406, entitled " Polymer Web, " which is incorporated herein by reference.

As described herein above, the composite back sheet of the present invention consists of a wearer outermost outer barrier layer and an inner barrier layer, which can simply be attached to one another by overlapping one another in the finished product, or can be joined together in an irregular or regular fashion. Can be.

In addition, the barrier layer may be applied substantially to the outermost web as an extrudate or coating, and optionally cured in place with, for example, an electron beam. For example, a macroscopically expanded three-dimensional web 20 ′ with a fine depression in the form generally shown in FIG. 2a can be used to directly direct a thin film of low density polyethylene (eg, approximately 0.0002 in. Thick) or a nylon thin film. Extruders such as National Rubber Machinery Co. Pacemaker III (NRM Process Systems; Columbia, Ohio, USA) can be used for casting. Materials and methods suitable for the manufacture of webs, such as (20 '), are generally filed on the same page as this application and pending in US Patent Application Attorney's Docket No. 3402, which is incorporated herein by reference.

The resulting composite structure 19 'has a liquid impermeable barrier layer 25 consisting of a thin polyethylene film or nylon coating and a non-closed wearer contact layer 20' with a macroscopically expanded, fine depression.

As another alternative, contact coating of a suitable monomer or other suitable crosslinkable coating onto the surface of the web, such as (20 '), and then curing the monomer in place using known curing stimulants such as electron beams or ultraviolet light. It can be.

Although specific embodiments of the present invention have been described by way of example, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the present invention, the scope of the appended utility model registration claims Includes all modifications falling within the scope of.

Claims (18)

(a) a liquid-permeable polymeric membrane superimposed on and adjacent to the first inner layer 25 and (b) the first layer, which is the liquid impermeable innermost layer 25, which is placed adjacent to the absorbent material 30 side by side. It consists of the 2nd layer which is the outermost layer 20 which consists of; At this time, a plurality of elastic protrusions 21 exist across the exposed membrane surface of the polymeric membrane, and each protrusion 21 is formed in a plane adjacent to the innermost layer 25 and protrudes outward. (21) is terminated to form a volcano-shaped depression 22, and each of the volcano-shaped depression 22 is characterized by the presence of a plurality of externally oriented peaks (23), Composite back sheet for use adjacent to 30). The method of claim 1, wherein the outermost layer 20, the second layer, is expanded macroscopically to provide a plurality of three-dimensional debossment 24 having a macroscopic cross section on the surface. The end wall of the Singh portion is located adjacent to the first layer, which is the innermost layer 25 of liquid impermeability. 3. The composite backside of claim 2 wherein the end wall of the debossed portion 24 present in the second layer, which is the outermost layer 20 'of the polymeric film, comprises a depression 27 having a macroscopic cross section. bedsheet. The composite back sheet according to claim 1, wherein the first layer, which is the liquid-impermeable innermost layer (25), and the second layer, which is the liquid-permeable outermost layer (20), are directly attached to each other. 5. The continuous polymeric coating of claim 4 wherein the first layer, the liquid impermeable innermost layer 25, is applied to the wearer-non-contacting surface of the second layer, the outermost layer 20 of the polymeric film. Composite back sheet consisting of a coating. 2. The composite back sheet of claim 1 wherein the first layer, the innermost layer of liquid impermeability, is made of a low elastic polymer that is cured in place. The composite back sheet according to claim 1, wherein the first layer, which is the liquid-impermeable innermost layer (25), is vapor permeable. The density of the projections 21 in the second layer, which is the outermost layer 20 'made of a polymeric film, is measured at the undebossed web surface, the density of 80 / in x 80 / in. Composite back sheet which is ideal. The composite back sheet according to claim 8, wherein the projections (21) are present at regular intervals relative to each other. The composite back sheet according to claim 8, wherein all the protrusions (21) have the same size and shape. The composite back sheet according to claim 1, wherein the density of the elastic protrusions (21) present in the outermost layer (20) is 80 / in x 80 / in or more. The second layer, the outermost layer 20, is expanded macroscopically to provide a plurality of three-dimensional debossed portions 24 having macroscopic cross sections on the surface of the second layer, wherein The end wall is a composite back sheet located adjacent to the first layer, which is the innermost layer 25 of liquid impermeability. 13. The composite backsheet according to claim 12, wherein the end wall of the debossed portion 24 present in the second layer, which is made of polymeric outermost layer 20 ', comprises a recess 27 in its macroscopic cross section. . 12. The composite back sheet of claim 11, wherein the liquid impermeable layer is vapor permeable. 12. The composite back sheet according to claim 11, wherein the projections (21) are present at regular intervals relative to each other. 12. A composite back sheet according to claim 11, wherein the size and shape of all the projections (21) are the same. delete delete