DE2358394A1 - ABSORBENT OBJECT TO DISPOSE OF - Google Patents

Description

PATENT ADVOCATE

6 Frt.r .. ^ iL · · ' 3 ..} iv'iiin 70 Schnedcwihoisfr. 27-i'al.017079

November 20, 1973 Gze / Ra.

Union Carbide Corporation, New York ", N.Y. 10017 / U.S.A.

Disposable absorbent article

The present invention relates to disposable absorbent articles; in particular, the invention relates to absorbent Throw away items such as baby diapers,

absorbent material for medical use (discharge pads incontinence) and the like.

The use of disposable absorbent articles of the kind referred to above has _y in recent years due to the convenience in their use combined with the low cost, greatly increased, especially because of the eye-catching value of clean, fresh, disposable absorbent articles, their use without the Labor of washing and reusing the previously used non-disposable items is possible. The advantages of using disposable absorbent articles are particularly clearly by the widespread inclusion of disposable diapers, which replaces the cloth diapers traditionally used habeH _e

In addition to the egwerfgegenständen -olbem on guided Vorteilea of absorbent ¥ belongs to many of these items as an integral part of its structure a © for Fluid = iradnrehlässigej speeds, rear sheet _9, wherein

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application leads to further advantages. For example, when using a disposable winch, which one is at the rear Foil, the use of rubber pants in babies is no longer necessary in order to ensure moisture penetration to prevent the diapers through which leads to wetting of the baby's clothes.

The present invention will be described in detail with reference to disposable winches, but it is applicable to those with experts clearly trusted this matter that the corresponding Teaching on other disposable absorbent articles, such as about discharge pads, absorbent pads or pads for medical needs and similar objects.

In the most basic embodiment, there is a disposable diaper mainly made of an absorbent layer of disposable material, which on the back with a Foil is lined with material impervious to liquids, which can be reused or disposed of is. The thickness of the layer of absorbent material can vary depending on the intended use be different. If the diaper e.g. overnight or Should be used for an older baby, then a larger absorption capacity with a correspondingly thicker one Absorbent layer required ^ than with a diaper that only intended for a short time during the day or for an infant is. The length and width of the Wijsctel can also correspond changed according to the different greetings of babies. Usually the absorbent pad has a thickness of about 3.2 to 12.7 nanometers, and the Wip.öel is about a length

from about 305 to 457 mm and a width of about 203 to 406 mm.

Although a baby diaper assembled in this way will die Has essential components of a disposable diaper, namely an absorbent layer and one for liquids impervious back sheet, are earlier modifications has been proposed to overcome one or more disadvantages associated with this basic design necessary are. For example, it has been found that when the absorbent sheet is soaked with urine, it is tends to 'curl up, or lose most of its overall strength and begin to break up into pieces dissolve.

In order to overcome these disadvantages, it has heretofore been customary to use a layer of non-woven material, gauze or other Provide material that its nature also according to the Moisture penetration is also retained on the upper part of the absorbent layer of the diaper, creating the absorbent layer sandwich-like between a top layer made of self-supporting, but liquid-permeable material and one Rear film made of liquid-impermeable material is arranged. With such an embodiment the disadvantages were overcome by dissolving it into individual pieces; however, this embodiment was found for the baby as uncomfortable because after wetting the urine was partially absorbed on the upper layer, which is the skin of the Babies. This contact between the builds of the baby and the urine on the surface of the diaper is one

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ORIGINAL INSPECTED

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of the basic causes of the diaper induced Skin rash. In addition, upon removal of the wet diaper, the baby's skin was found to be wet and had to be dried off before a fresh diaper could be put on.

To overcome this deficiency it has been proposed to make the upper layer hydrophobic or water-repellent, to keep the layer in contact with the baby's skin as dry as possible. This was achieved by the upper class the diaper has been formed partially or wholly from hydrophobic fibers, or by adding an otherwise hydrophilic Top layer was impregnated or coated with a hydrophobic resin.

This method has not been completely satisfactory because the topsheet of the diaper, whether woven or non-woven Material that has spaces between the fibers that are resistant to the passage of liquid in both directions stand open. The spaces are required to allow urine from the baby to reach the absorbent layer the diaper can get. When the diaper has reached its maximum capacity, or when pressure is on the absorbent layer is exerted, for example by the fact that the baby is sitting in the wet diaper, then the absorbent acts Layer just like a sponge that has been completely saturated or compressed, and secretes that Urine on the surface from where it can pass through the openings in the topsheet and with the baby's skin can come into contact.

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INSPECTED

It is therefore an object of the present invention to provide a to provide a disposable absorbent article such as a disposable diaper, with a topsheet that allows drainage the liquid in the direction of the absorbent layer willingly allows, which however the possibility largely excludes a backflow in the opposite direction. These and other objects of the invention are achieved to those skilled in the art from the following description, examples, drawings and claims.

In their broadest scope, there are disposable absorbent articles according to the present invention from the combination of at least one absorbent pad and one with this base adjacent top layer, which has a plurality of closable openings. The upper class is preferably formed from a non-fibrous, hydrophobic film, such as a thermoplastic film, in which consist of a large number of closable openings.

The invention is explained in detail with reference to the drawings explained; show:

Fig. 1 is a plan view, partly in section, of a disposable diaper according to one embodiment of the present invention;

Fig. 2 is a plan view, partly in section, of a disposable diaper , according to another and preferred embodiment of the present invention;

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FIG. 3 shows a section along the line 3-3 of FIG. 2;

FIG. H shows an enlarged detail from the cross section according to FIG. 3, which shows a section of the absorbent article in the unsaturated state; FIG.

Fig. 5 is a view similar to FIG _t h with the exception that the absorbent article is saturated with liquid.

Figure 6 is a plan view, partly in section, of a disposable diaper according to a further, but less preferred embodiment of the present invention.

1 shows a disposable diaper, generally designated IO, which comprises a rectangular, absorbent pad 12 which is substantially centrally disposed and sandwiched between a thin, flexible backing sheet lh of liquid impervious material, such as a polyethylene film, and a thin, flexible topsheet 16, usually also made of a material impervious to liquids. In the topsheet 16 there are a plurality of slits 18, which are described in detail below.

The rear sheet 14 and the topsheet 16 are approximately the same size and slightly exceed the corresponding dimensions of the absorbent pad 12 in terms of length and width. The edges of the rear sheet lh are mutually sealed against the edges of the topsheet 16

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around the full circumference of the diaper and just outside the outermost edges of the absorbent pad 12. The seal can be achieved by any convenient means, such as the use of adhesives, however, a heat seal is preferred which is compatible with Heat melting or seal 20 around the perimeter of the Diaper is indicated.

The absorbent pad 12 consists of a plurality of layers of absorbent tissue paper or wadding which is piled up to the desired thickness. The wadding layers do not have to be glued together, but since it is customary to bond the layers together by means of adhesives, mechanical measures or other means in order to maintain the relative arrangement of the layers and the shape of the absorbent pad, such means or measures can also be applied to the diaper after the the present invention can be applied. The wadding can be piled up to form a base of the desired thickness, and the absorbency can thus also be controlled for each individual intended use. For example, it has check in conventional disposable diapers which are intended for use during the day, proved to be common to the absorbent cotton wool to a thickness of about 3 _mm} 2 pile up, for which usually 5 to 10 Cotton & chichten be used. For special purposes, such as sew-on diapers, a thicker and more absorbent pad may be desirable and a thickness of about 6.4 mm with about 10 to 20 layers of cotton is usually considered sufficient.

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Absorbent materials other than tissue paper and wadding can of course also be used in the diapers according to the invention will. For example, absorbent, non-woven materials can be produced in any thickness that allows the can replace absorbent pads described above. One such absorbent pad that is used in disposable diapers Used on an extraordinarily large scale, consists of a wood pulp product commonly called wood flakes (wood fluff) and is made in the same way as non-woven fabric.

The only requirements for usability under of the present invention are that the material is absorbent to a base can be processed, is compatible with the waste products with which it comes into contact, and does not cause irritation exerts on the skin.

Various natural and synthetic polymeric materials are self-absorbent or can be made absorbent and are therefore useful as, or in conjunction with, the absorbent pad of the present invention. One group of polymeric materials that are particularly preferred are insoluble, hydrophilic homopolymers and copolymers, which form a gel when water is absorbed. These materials offer the obvious advantage that they Hold liquids stubbornly and prevent the liquid from being released from the absorbent article Prevent skin or clothing from getting damp or wet.

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In practice, the materials that are special very suitable, insoluble, hydrophilic polymers which have been prepared from the following starting materials: Poly (alkylene oxides), i.e. poly (ethylene oxide), polyvinyl alcohol, polyvinyl methyl ether, copolymers of maleic anhydride and ethylene, copolymers of maleic anhydride and vinyl methyl ether, polyelectrolytes and similar materials.

Such insoluble, hydrophilic polymers, which are sometimes called "Hydrogels" are referred to are particularly useful in the context of the present invention because they have the ability absorb large amounts of water, namely about 25 to 100 times their dry weight.

In connection with these polymers the terms "insoluble" or "rendering insoluble" used to mean the formation of a gel that does not flow, and from which no water escapes under the pressures which occur when using the above-mentioned products.

The insolubilization can be done by a variety of methods

can be achieved - are limited to this " _s include Jiiersra ioaisieireaö © nrad Bielrt ^ ioslsiereaiä © irradiation nnü die cJaeMlseSae ¥ era © tsraag ctareli Jkovalemt® and ioiaiscii © Bim = ctaageKu

Sim for oil © Y <3Tw <sm <ä.ting, in «i®H © rf iralwsgs according to ei Gegemstäffiiö © H

Feevoraagtes Hydrogel eatkält aissäiadlast a SayteopSaiies of the folgeiadea Foreels

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ORIGINAL INSPECTED

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which has been crosslinked, and where the radicals R ₁ and R _{2 are} hydrogen, alkyl radicals, alkyl-substituted aryl radicals, and the radicals H to R ^ are hydrogen, methyl, phenyl and vinyl radicals, and η is a value greater than i having. The hydrogels are polymeric compounds which have at least one of the following structural units:

-G

H
I.

where the radicals R ₁ to R. mean hydrogen, methyl, phenyl and vinyl radicals.

These hydrophilic polymers have carbon-carbon crosslinks between the carbon atoms from straight chains and the carbon atoms from methyl groups from branched ones Chains on, and in addition to that in a very small and insignificant number of bonds between two oxygen atoms, which connect the carbon atoms.

The polymeric gel compounds can have crosslinked bonds, which as inter-molecular bonds (i.e. as bonds between two different molecules) and intramolecular bonds (i.e. as bonds between two carbon atoms of the same molecule), with combinations between intra- and inter-molecular cross-linked Ties are possible.

The hydrogels in the diaper construction of the present invention can either be in the form of thin, translucent ones Films are used which are arranged between or instead of the cotton wool layers of the absorbent pad, or they can be embedded as a powder or in comminuted form between the fibers of the absorbent pad. the The way in which the materials are incorporated into the backing is not of great importance, as it is primarily What is required is that the polymers come into contact with the liquid which passes through the topsheet of the absorbent Object penetrates.

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ORIGINAL INSPECTED

The materials; which are used in making the topsheet and backing sheet of absorbent articles of the present invention used are not limited to any particular chemical composition as it rather- their physical properties than their chemical properties Properties are what such materials for the invention Make objects meaningful. These materials should, of course, be thin, pliable and self-supporting, and form substantially water-impermeable films. They are preferably made of thermoplastic materials, which under Can be welded or sealed against each other under the effect of heat.

The back sheet is preferably made of an olefinic film or a vinyl film. Most will use polyethylene a thickness of about 0.010 to about 0.038 mm is preferred. This type of film has been widely used so far used for this purpose, and usually a pattern is embossed on the surface of these films to give the impression and simulate tissue handling. These manufacturing processes can also be applied to the absorbent articles of the present invention can be applied.

Any film that is useful as a backing sheet can also be used as a topsheet for the disposable absorbent articles can be used according to the present invention. However, it is preferable to use a film as the top layer, which is more reminiscent of tissue in terms of impression and touch, since it is this section of the object that is connected to the Skin of the user comes into contact. As particularly useful

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OfIIGlNAL INSPECTED

A film made of ethylene-ethyl-acrylate has proven to be suitable for this. This copolymer is fabric-like, softer and, after cutting, stronger than a film made of polyethylene. The movie should have a thickness of about 0.010 to about 0.051 mm, with a thickness of about 0.025 to 0.038 mm being preferred will.

As described above, the topsheet becomes essentially one film impermeable to liquids and must be provided with closable openings in order to be able to withstand the absorbent articles of the present invention to be effective.

or valve-like "

The term "closable / (valvular) is used throughout the description and claims to mean To designate openings in the top layer that can be opened to allow liquid under certain conditions can pass through, and which can be closed to allow the passage of liquid under certain other conditions to prevent. In the open state, the closable openings should have the ability that through a

at least 20 ml of liquid pass through the wetted area of approximately 130 cm within 10 seconds. For this Openings can be of two basic types, namely, essentially straight slots and punctures.

The slots useful in the present invention must be essentially straight because if such slots are curved, V-shaped, or any other configuration have, then they form flaps or flaps on the upper part. area of the film that can be opened too easily and

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INSPECTH)

tend to stay open. Although such slots make a allow sufficient passage of the liquid in the direction of the absorbent pad, they have no effect, in order to substantially prevent the reflux of the liquid, which, however, is the main object of the present invention. This disadvantage also occurs when holes are formed in the film by removing pieces of film material, in contrast to the production of punctures in the film, namely in which no film material is removed. The film points as a result If there are holes in the missing material, it is open to the uncontrolled passage of the liquid in both directions.

Recently it has been suggested (such as in U.S. Patents 2,877,765 and 3,399,672) to provide curved slits in that layer of dressings or bandages which applied directly to the skin to facilitate removal of the dressing from the skin. For that special one In use, however, it has been found that straight slots are not effective. In complete contrast to this, it has now been found that rectilinear slots are excellent and unexpectedly suitable for the topsheets of disposable diapers, while curved ones Slots are unsuitable for this purpose. This different performance of straight slots versus curved ones Seating can probably best be explained by the different functions that the slots in the must meet the respective use cases.

In the case of bandages, for example, the top layer must be permeable to liquids which come out of the wound usually slowly over a

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emerge for a longer period of time. Reflux from the dressing is not a problem as there is sufficient time stands so that the liquid is absorbed into the absorbent Layer is distributed, and no accumulation of liquid on the intermediate layer between the absorbent Layer and the top layer forms.

In contrast, a disposable diaper in use made considerably different demands. Unlike a slow, steady passage of fluid, urinate Babies, before the bladder has been brought under control, 5 to 30 or 40 times a day, about 10 times a day on average, about 40 g of urine are released per urination. It therefore, intermittent flows of liquid occur which come into contact with the topsheet of the diaper. This liquid must quickly pass through the topsheet to the absorbent layer, and the topsheet must prevent backflow of the liquid to such an extent that so that the liquid can be absorbed. This problem becomes apparent after the second and each subsequent Uri- nation increasingly difficult, since the absorption capacity of the absorbent layers is considerably reduced. In addition, if the baby is in a wet diaper, liquid will stick to the surface of the absorbent pad released from where it passes through the topsheet and can come into contact with the baby's skin, unless the openings in the topsheet act to prevent such backflow.

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As explained below, curved slots allow allow adequate drainage of the liquid towards the absorbent layer, but prevent backflow not to such an extent as to permit their use in an improved embodiment.

The attached drawing shows a preferred embodiment the topsheet, in which the topsheet 16 has a plurality of straight slits 18 which are staggered parallel rows are arranged along the surface of the topsheet. This embodiment is preferred because it leads to a solid top layer, which nevertheless allows maximum penetration of the liquid.

To be effective, the top layer should be 6.5 cm of film have about 10 to 1000 closable openings. If slots are used, each should be approximately in length 0.76 to about 12.7 mm. Are preferred to

ο
b. 5 cm there are about 30 to about 150 slots, each of these slots being about 1.78 to about 5.08 mm in length. The most preferred film contains ^{about 50 slits per 6.5 cm 1} ", each of which is approximately 2, ^r > h mm in length.

The slots allow the topsheet of the absorbent article to act as a kind of one-way valve for liquid flow works. For example, in the case of an x-disposable diaper, movement of the baby within the diaper such as the Walking or sitting so that the slots are opened and closed continuously. If the baby wets, then touch

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OfHGlNAL INSPECTED

the urine the topsheet of the diaper, and any movement through it A part of the baby's body causes the opening of a multitude of slits, allowing the urine to be absorbent to the underlying Support can flow off. Even without a partial movement of the baby, making the diaper are the baby partially enveloping a number of slots for passage opened to the liquid. There is little contact between the liquid and the absorbent pad necessary. After this contact has occurred, and that Has started to drain, a kind of siphon effect is created, which causes substantially all of the urine to pass through the topsheet into the absorbent pad drains. After the urine has drained through the slits, the outer surface of the topsheet does as a result their hydrophobic nature gives them an almost dry impression.

A passage of the urine from the absorbent pad back through the slits is prevented because there is no accumulation of liquid in contact with the underside of the topsheet occurs, causing the liquid through the as a result the movement of the baby flows back open and closed slits. This creates an effective boundary layer built up5 which prevents the urine from coming back and comes into contact with the baby's skin; This creates the outermost section of the topsheet, which is the baby's skin touched, kept relatively dry.

The closable openings in the top layer can be formed in a variety of ways. To the simplest method includes the use of a roller with a number of razors—

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ORIGINAL INSPECTED

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Knife cutting around their circumference across the width protrude from the roller. The cutting edges can be arranged on the roller as desired, and if the section, which protrudes from the roller, has a triangular shape, then the length of the slots which are cut in the film, by limiting the depth to which the blades pierce the film. It can be flexible, backward Roller may be provided to facilitate the piercing of the film between the slitting roller and the back roll is passed through. If desired, sections of the upper layer can be in a non-pierced state lag behind. This can be done, for example, along a strip with a width of approximately 25 ram around the circumference the upper class. Such a strip acts as an additional protection against a penetration of the liquid the edges of the diaper, which can come into direct contact with the baby's clothing.

After the topsheet is slit, the assembly of the diaper follows more or less conventional procedures Diaper manufacturing. The top layer and the back sheet are cut to approximately the same dimensions, which correspond to the desired size of the finished diaper. The size can depend on the intended use depend, for example, a size of 254 x 355 mm is sufficient for the diaper of babies, while

for a larger child's diaper, dimensions of 305 x 406 mm would be better, with a size of 355 x ^ 57 mm is preferred for a toddler's diaper.

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ORiGINAL INSPECTED

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The topsheet and the backing film x ^ are placed exactly on top of one another, with the absorbent pad sandwiched close to the center between the layers. The length and width of the absorbent pad should be slightly smaller than the corresponding dimensions of the top layer and the backing film ₉ so that sealing or welding of the top layer and backing film around their circumference is possible. For this purpose, a projecting hand "with a width of approximately 12.5 should mm on each side are sufficient. The sealing or welding may be by conventional processes done by the edges by heat welded. The heat-welding may be simultaneously erwendet \ ^r to cutting the edges to cut off excess film material from the diaper and give a diaper structure with a clean appearance.

If desired, the absorbent pad can be the same length as the topsheet and backing sheet, and the top and bottom edges of the diaper can be left untwisted. Such an embodiment facilitates Of course, mass production, since the diapers are hexagonal in the form of an endless belt and cut to the desired length Can be trimmed without further finishing is required.

Ks was found to be the diaper in the above-described Ali and way can be put together before the Oberscji it has been slotted before and it can be a rotating one .Sliding device .be used to open the lockable Cut openings in the topsheet of the finished diaper,

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ORIGINAL INSPECTED

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without damage to the rear film or a loss of impermeability to the liquid «

It is apparent to those skilled in the art that the applicant a basic embodiment for a diaper is described which can be adapted to include other materials for special purposes. For example, it can be desirable be to add a perfume or deodorant to the absorbent pad on the outer surface of the topsheet baby powder or lotion may be provided, or a germicidal agent may be used anywhere on the diaper can be added.

In addition, it is apparent to those skilled in the art that the above teaching, which is detailed in relation to disposable diapers for babies has been set forth, to the same extent for similar disposable absorbent articles such as drainage pads and the like, is applicable. For every diesel 'application is the structure of the absorbent article basically the same as described above for a diaper was, with the exception that size, shape and absorbency be adapted to the specific purpose. Additionally you can use strips, glue or some other means of attachment may be provided in a suitable form to increase the convenience of use.

The following examples serve primarily to illustrate the present invention without in any way whatsoever to restrict.

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example 1

An absorbent pad made up of eight layers of absorbent wadding with approximate dimensions of 505 x 406 χ 4.76 µm was placed in the middle on a sheet of polyethylene film with laid to dimensions of approximately 311 χ 412 χ 0.032 mm, in which a taffeta pattern had been embossed.

A 0.032 mm thick sheet of ethylene-ethyl acrylate film was made thereby perforated by being between a roller with a multitude of small cutting edges which are in staggered parallel Rows were arranged on the circumference of the roller, and a flexible pressure roller was passed through. The perforating The roller had a cutting density of approximately 125 cutting edges

6.5 cm, and the perforated film treated with it showed Ungern

make about 125 parallel slots per 6.5 cm ", each of which was approximately 2.54 mm in length.

The perforated film was cut to approximately 311 χ 412 mm and placed on top of the absorbent wadding pad, whereby the pad is sand-like between the perforated film and the Polyethylene film is located. The edges of the two films are then heated to one another with a heating rod welded to complete the assembly process; the disposable diaper obtained thereby functioned satisfactorily.

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ORIGINAL INSPECTED

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Example 2

From a rear sheet of transparent polyethylene film with the approximate dimensions 311 x 412 x 0.032 mm and a top layer of transparent ethylene-ethyl aerylate film with approximate dimensions 311 χ "^ 12 χ 0.032 mm a disposable diaper was made. The absorbent pad consisted of eight layers of absorbent wadding with the approximate dimensions 305 x 406 χ 4.76 mm. The three layers the diaper was folded up and heat-sealed in the same way as in Example 1, and then passing the completed diaper, topsheet up, under a rotating slitter. The cutting edges of the slitter were set to pierce and partially pierce the topsheet penetrate the absorbent pad without, however, penetrating through the absorbent pad and the rear Touching foil. The slits formed were the same in size and arrangement as after Example 1, and the diaper obtained was found to be as good as the diaper of Example 1.

Example 3

A diaper was made according to the procedure given in Example 2, except that the one used was absorbent Pad with about 2 g of cross-linked, powdery Poly (ethylene oxide) was formed, which was scattered on four layers of cotton wool and with two more cotton wool layers was covered. All of this material was then used to make a diaper.

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ORIGINAL! NSFECTED

■ η · ■ '

394

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The diaper obtained in this way was thinner than the diaper according to Example 2, but had a greater absorption capacity.

The following tests were conducted to improve performance of curved slots versus straight slots to compare in the upper class of diapers constructed in the same way.

Attempt 1

A round film sample with a diameter of 138.5 mm was made placed on a sieve and covered with a circular piece (diameter 8.5 mm) of absorbent material; both were placed between a glass cylinder with a diameter of 138.5 mm and a funnel with a diameter of 127 mm clamped, which led to a measuring cylinder *. A rubber stopper (No. 13) was placed on the sample film and quickly Put 200 inl of water into the glass cylinder. It became the required one Time measured until the first drop of water was collected and until 100 ml of water had been collected.

The sample films examined had approximately k5 to 48 slits

2
to 6.5 cm with an average slot length of 2.54 minutes. If slits were being examined, the first drop of water was collected after 2 seconds and 100 ml after 1 hour. If curved slits were examined, the first drop was collected after 1 second and 100 ml after 3 seconds.

The results of this comparative experiment show that both just like curved slots are satisfactorily suited to To allow liquid to pass through to the absorbent medium.

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OfUGiMAl INSPECTED

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Attempt 2

The same glassware was used as in Experiment 1, but the test procedure was similar modified so that the reflux could be determined on film samples (identical to those from experiment 1).

The film was placed over the top opening of the funnel so that it neither sagged nor was stretched so far that an opening formed. A circular piece of cotton wool was placed over the film and the glass cylinder clamped in this position. There were 100 ml of water in the cylinder given and determined the time after which the first drop and 10 ml of water collected in the measuring cylinder had.

When using film samples with straight slits as well as with curved slits, the first drop was inside one second, for the samples with curved slits, however, the 10 ml had already been collected after 10 seconds while the straight slots took 95 seconds to collect the same volume. The reflux with curved slots is therefore considerably faster than with straight slots, which foils with makes curved slits unsuitable for an improved diaper.

Attempt 3

Reflux was also observed on films with curved and straight slits the same size and number as the films

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determined according to experiments 1 and 2 by moistening an absorbent pad (diameter 127 mm) with 30 ml of water the pad was covered with the sample film, and the film was covered with another dry absorbent pad from known weight and placed a 5 »^ kg weight on it became. After 2 seconds, the dry pad was weighed to determine the water absorption.

For the curved slots the mean reflux was 5.1 g, while the reflux for the straight slots was only 3.0 g on average, which in turn proves that straight Slits are more suitable for use in diapers than curved slits.

A control was also run with no film sandwiched between the dry and wet backing, and with a non-woven material, with 50 % open spaces between the backing. In the test without a film between the substrates, S.9 g of water were absorbed, while 7.1 g of water were absorbed with the intermediate layer of non-woven material.

From the above it is clear that the in connection The absorbent article described with Fig. 1 solves numerous problems associated with known prior art related absorbent articles are incurred, especially those problems with diapers, discharge pads and similar materials are important.

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ORIGiMAL INSPECTED

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Unfortunately, although the major problems of the conventional products have been eliminated, the merits of the new absorbent ones are increasing Objects offset by minor disadvantages to a certain extent, which, although they are by no means are as serious as the difficulties with the conventional ones Products, nonetheless, as an obstacle on the way to achieving an absorbent article, in particular a baby diaper, with optimal properties such as functional usability, dimensional (or relative) stability (including Stability in the moist state) and absorption by the consumer.

liier should be remembered that to the qualities or Properties that make an absorbent article, for example Make a baby diaper superior to other known products, including the following properties:

(a) It must be ensured (if a hydrophobic top layer is used) that the necessary passage of urine takes place through the openings of the hydrophobic layer to the absorbent layer within such a period of time, that the residence time, i.e. the time between urination and absorption, is so short that discomfort, rashes, Leakage of urine to the outside and the like do not occur;

(b) The proportion of urine that passes through the openings of the hydrophobic Layer flowing back when the absorbent layer is soaked and compressed must be greatly reduced will;

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OKlGiNAL INSPECTED

(? c) The absorbent article must have dimensional stability or have at least relative stability; and

(d) the absorbent article must have an aesthetic appearance - apply pressure, i.e. it must feel comfortable and look good.

With the designation "dimensional stability or at least relative stability", as it is used under point (c), is intended to mean that the individual components of the absorbent article remain firmly connected to one another. For example, if a baby diaper has a topsheet and a back sheet sandwiched with absorbent Material is arranged, then it is advantageous that the absorbent material in relation to the topsheet or the backing sheet is attached so as to prevent "migration" of the absorbent material. If the components do not mutually maintain their position, that ultimately leads to the fact that the absorbent material is gathered into a ball or rolled, especially when the baby is in the wet diaper sits and moves.

It is also intended that when this term is used in conjunction with the wet condition of the diaper State is used, the ability of the constituents of the Diaper should be expressed, its strength and resistance to dissolving into individual strips after wet- will express.

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ORIGINAL

That is, although the absorbent article depicted in Figure 1 is an improvement over conventional absorbent ones Articles represent are nonetheless still in relation to one or more of the qualities and properties mentioned above determine certain disadvantages. For example, if point (a) considered, it is, in spite of the fact that the closable openings in the upper layer within 10 seconds

2
allow at least 20 ml of liquid to pass through an area of 130 cm, the initial period of time for soaking, ie until the absorption of the liquid actually occurs into the absorbent material, is still not optimal. In other words, the residence time of the liquid (urine in the case of diapers) before the absorption begins is so great that discomfort can occur.

With regard to item (c), it was found that the absorbent article depicted in Fig. 1 does not exhibit dimensional stability or has relative stability which is clearly superior to conventional objects. This is presumably based insists that the absorbent material is sandwiched between the topsheet and the backing sheet is, however, without being glued to them, whereby there is necessarily a certain tendency that the absorbent Material "migrates" or is pushed back and forth with respect to the edges of the top and bottom layers. Furthermore can use the vertically aligned, closable openings (slots), although they have the valve effect described above guarantee quite well, nonetheless like a zipper rise ", i.e. there is a tendency that a vertical

409824/0285

OfiiGiNÄL INSPECTED

arranged slot up to ζυ the next corresponding one above or below arranged vertical slot tears.

With regard to item (d), it has been found that the aesthetic qualities of the absorbent article differ from the commercial Not completely satisfactory from this point of view, since the upper layer lacks a warm appearance when it comes to the optical impression.

Various efforts have been made to address one or more of the 2 disadvantages associated with an absorbent article are connected according to Fig. 1, to be limited to a minimum or to be eliminated entirely. Initially it was tried in order to ensure the relative stability of the topsheet with regard to the absorbent material, the topsheet with adhering an adhesive to the absorbent layer; however, it has been found that improved dimensional stability at the expense of the absorbent properties of the article and its soft grip was achieved. In order to eliminate the disadvantage of the "zipper-like opening", The vertically aligned slots have been dispensed with and these have been replaced by curved and V-shaped slots.

But these variations in the pattern confirmed the observations already described above that curved or V-shaped slits tabs on the surface of the topsheet which can be opened too easily and which tend to remain in the open state, whereby the liquid can flow back and come into contact with the skin.

409824/0 285

ORIGINAL! NSPECTED

23-3394

Various other possibilities have also been considered, for example piercing the absorbent article with needles in order to secure the absorbent material in view of the topsheet; However, it was found here that the additional process costs in addition to the loss of absorption properties and strength which occurred created new disadvantages which far exceeded the problems to be solved.

own
In the course of the development work, a method was also investigated in which the topsheet was adhered to the absorbent layer at various points along the lower surface of the topsheet. The sticking was done by touching the absorbent article with a roller, which had a system of probes, or with the aid of heat and pressure; This made it possible to depress and soften the top layer (if it consisted of thermoplastic material) at the points where it came into contact with the probes so that the fibers of the absorbent layer immediately below the probes softened with the, impressed, thermoplastic top layer. After the thermoplastic material cooled, the interpenetrated fibers were permanently embedded in the topsheet, reducing migration of the absorbent material.

However, as stated above, the absorption of the liquid passes through the closable slits, which must allow the passage of the liquid to the absorbent layer. It therefore seemed obvious that if the

409824/0285

ORIGINAL JiWECTED

23 ^ 394 - 3d -

Probes have indented and softened the thermoplastic material sufficiently to embed absorbent fibers therein that those slots fuse into contact with the probes, thereby reducing the number of openings through which liquid can pass, resulting in poor initial wicking and the total absorption of the liquid deteriorates. In other words, the solution to a problem (prostitution stability) would occur at the expense of other qualities (good absorption properties).

However, if the obtained absorbent material in view of was examined for its absorption properties, then it was completely surprising and contrary to usual expectation found that the absorbency and, more significantly, the wicking effect have been dramatically improved »It was in Indeed, surprising to find that this technique leads to a absorbent article with excellent absorption and wicking properties, since it, as stated above, logically and it seemed obvious that if the thermoplastic material was selected with a hot probe in the one described above It is treated in a way that then by merging such Slots that come into contact with the hot probe, a loss of absorption capacity should occur. Here the teaching of U.S. Patent 3,221,738 was of course taken into account. The diaper according to this patent consists of a core of moisture-absorbent material that is completely of a thin plastic film that insulates against liquid is included, and the main feature of which is that the plastic film on one of the sides of the core is inside-

409824/028

ORIGINAL INSPECTED

lialb of the edges formed by these, in a soldier manner heat-treated -is that the insulating against liquid ownership of the film completely or at least partially is eliminated so that liquid reaching the surface of the heat-treated film is automatically passed through the lolie is sucked in and absorbed by the core. That The method is further characterized in that the foils- layer is heated by means of a number of heated metal bodies, which are arranged at small distances from one another so that the film layer forms a net-like pattern of such film, which insulates against the liquid.

According to this doctrine, the passage of liquid occurs through the pores passing through, which through the on the manner described in the patent in heating the film layer were formed.

This well-known doctrine is diametrically opposed to that what is intended by the present invention. According to the present invention, most of the liquid absorption must take place through the closable slots, in complete contrast to the absorption by the thermoplastic top layer in the indented areas. Aul "this way, through the action of the valve-like slits (as set out above and explained in more detail below), the desired penetration of the liquid is controlled. That is, the indented areas according to the present invention (these are hereinafter referred to as "depressions" called) serve the purpose of bringing about dimensional stability, the aesthetic impression of the material

409824AO285

OfJIGiMAL INSf ⁵ ECTEi

23- / 394 - 33 -

improve and to aid absorption in the manner that will be explained with reference to the drawings.

Figure 2 (like numerals refer to like parts in all figures) shows an improved disposable diaper 10, inclusive the rectangular, absorbent pad 12, the flexible rear sheet 14 made of liquid impermeable Material, and the flexible topsheet 16, which is normally also made of liquid impermeable Material. The method of manufacture, the properties, the choice of materials, and the featured Properties for the improved diaper shown in FIG. 2 correspond to those of the diaper according to FIG. 1, apart from the particular differences set out below. Over the surface of the topsheet 16 is a system of closable openings (slots) distributed, which are denoted by the reference numeral 18a, and a System of indented areas 22 (depressions). The slots 18a are arranged in longitudinal rows in such a way that that each row represents an elongated region of substantially parallel, straight slots, each one of which possesses angular orientation with respect to the longitudinal axis of the row. Adjacent rows are arranged similarly, but with the exception that the slots are arranged in such a way that the end points of each slot lie on a line substantially between the endpoints of corresponding slots of adjacent alternating Rows runs. The slots suitable for the present invention must be substantially straight because if they a curved, V-shaped, or other configuration then they form tabs in the surface of the film,

4 0 9 8 2 4/0285

ORIGINAL INSPECTED

- 3 * 1

dex "then opens too easily and tends to be in the open State to remain. In addition, the angular arrangement of the slots, as described above, prevents the "zipper-like" Tear ", thereby eliminating one of the primary disadvantages of the absorbent articles of Figure 1. Any the slots should have a length of about 0.762 to about

6.35 mn *. Preferred is about 30 to 6.5 cm " approximately 150 slots are provided, each of these slots has a length of about 1.778 to about 5 * 08 minutes.

Most preferred films contain approximately 6.5 cm 81 slots, each approximately 2.54mm in length.

The slots can be formed by methods described in Connection with the absorbent diaper according to Pig. I are described. The preferred method of forming the slots In the top layer, however, in short, there is a plastic film between a piercing part with a A plurality of independent, flexible projections which protrude from this part, and a rear part with a reticulated, outer surface. The piercing part, or the rear part, becomes relative moved against the other part, whereby the flexible protrusions follow the reticulated surface and selectively pierce the film. The piercing part can consist of a metal comb, a Wire brush or a metal strip, which has a plurality of substantially parallel slots extending from one edge in the direction of the opposite Reach the edge, which forms the flexible protrusions. The rear part can be made from a wire screen,

409824/0285

OFlIGlNAL INSPECTED

23 ^; , - .: 394

- 55 -

a perforated metal plate, a scratched metal roller, or consist of an endless band related to the piercing part is driven in the longitudinal direction.

The indented areas 22 (depressions) are distributed over the surface of the top layer in the manner shown in FIGS. That is, it can be seen that the topsheet 1b has a plurality of depressions which are arranged in staggered, parallel lines along the surface of the topsheet (FIG. 2) and which are below the plane of the topsheet (FIGS. 3 and 3) h) enough. The Ausgestaltxmg these recesses can be circular, elliptical, rectangular, diamond-shaped or similar; What is important is that they have been formed in such a way that there is essentially no breakage or cutting of the top layer in the course of division or danacii.

It has been observed that the full benefits of the present Invention cannot be achieved if the top layer is broken in the course of making the recess, cut or melted to such an extent that obstructs the controlled passage of the liquid to the absorbent pad (which is described above as the effect of the closable Openings has been described). It is evident that if, in the course of the production of the indentations, there is an incision or breakage of the topsheet occurs, then the liquid will pass through these cuts or breaks ΐνπ jfl, if the absorbent pad is not saturated, and if then the absorbent pad is saturated or even is only partially saturated that then these access points too

■ 4 09824/0285

235 9394

serve as such points or places through which the liquid flows back and through the upper layer and comes into contact, e.g. with the baby's skin.

For these reasons, and also to facilitate and simplify manufacture, it has been found that circular depressions, as shown in FIGS. 2 to k , are preferred.

The depressions can be formed in the top layer in a variety of ways. The simplest, and therefore the strongest preferred method involves the use of a roller, which is equipped with heating means, and has a plurality of spikes or probes, which over the width of the The roller and its circumference protrude. The spikes, mandrels or probes, which have smooth, rounded end points, can be arranged as desired on the roll to the desired number of depressions on the absorbent article deliver. The depressions are preferably formed on the absorbent article after the closable openings have been formed but prior to the complete manufacture of the absorbent article, and this process step can can be achieved in that the absorbent article, which has the closable openings, in contact is guided past a heated roller. In this method, the absorbent pad rests on a resilient one rear part, such as an endless conveyor belt, or a compliant, rear roller. The depth of the pits can be controlled by limiting the depth to which the probes penetrate the film. When it

409824/028

ORIGINAL INSPECTED

235S394

If desired, portions of the topsheet may be left untreated (with no depressions). This can be, for example along a strip approximately 25.4 mm wide close to the perimeter of the upper class. Since the top layer is made of thermoplastic material, the extent to which With the heat and pressure acting on the areas to be treated, very carefully controlled in order to prevent a breakthrough or to essentially avoid penetration of the top layer. As a general rule, the required heat should be sufficient to soften the film * and the pressure should be sufficient to plasticize the film to the general outline deform the probe. Of course, it should be noted that the exact heat and pressure conditions depend on (next to other variables) on the residence time of the treated absorbent pad, i.e. on the length of time with which the Top layer is in contact with the roller; from the thickness the absorbent pad and similar factors. However, the exact conditions can easily be determined by one skilled in the art can be determined, so that a further, detailed description of these conditions does not appear necessary.

From Figs. 3 and h can be seen that the recesses 22 a short distance below the plane of the topsheet ± 6 extend, and that the absorbent material 12a is present directly below the recesses in a compressed state. At the points at which the depression was formed over a portion of the slot 18a, it can be seen that the slot is open to a far greater extent than corresponding seat slots which are located apart from the depressions 22. However, because of the location of the indentations, the slots are what

409824/0285

ORIGINAL INSPECTED

2353394

are arranged between corresponding depressions, opened wider than would be the case if no depressions were available. This is due to the fact that the pressure exerted by the depressions on the surface of the topsheet, under the influence of a Tensioning the top layer causes the slits to open slightly. Parts of the compressed, absorbent pad are connected to these open slots, and because of this contact, soaking is achieved to such an extent that that has never been achieved before. In fact, in most cases, the soaking is instantaneous. To the extent that in After the liquid is transferred to the absorbent pad 12, the absorbent pad absorbs the liquid over its entire range until either partial or complete saturation has occurred «As from Fig. 5 (Here a saturated absorbent pad is shown) can be seen, the compressed material 12a expands and pushes the recess 22 upwards, closer to the plane of the topsheet 16. This action is used to close the previously open slits, whereby most of the liquid is trapped in the absorbent pad will.

Advantageously, therefore, according to the present invention a maximum wicking and absorption effect in the course of the critical period of time during the liquid flow (approx during urination and similar processes), while the liquid leaks out of the absorbent pad back considerably reduced by the same slot openings is due to the combination of the shut-off effect

409824/0285

ORIGINAL INSPECTED

2350394

the slots and the indentations.

The depressions can be in on the absorbent article a plurality of patterns can be arranged. That is, the effect of the entire pattern can be a rhombus, a curved one Line, herringbone and other patterns. The preferred pattern consists of a system of substantially straight * staggered parallel rows along der, surface of the upper class. The number of depressions per 6.5 cm of the area of the absorbent pad can be can be varied over a relatively wide range. Even if only one indentation (with a diameter of i, 27 mm) on

6.5 cm absorbent pad was used, improvements were made observed. Further, it was observed that good results were obtained even if 100 wells (1.27 mm diameter) within 6.5 cm of the area of the absorbent pad. Here is Of course, note that the number of wells that

can be accommodated on an area of 6.5 cm of the absorbent pad, depending on the size of the wells. As a general rule, the total area occupied by the wells should not exceed 20% of the area of the absorbent material. Excellent results are obtained when the total area of the depressions h takes up to 12 % of the area of the absorbent material. About 3 to about 3 are preferred

25 wells (with a diameter of 2.5 ^ mm) on 6.5 cm the range of absorbent material, most preferably about 6 to about 15 wells by 6.5 cm the area on the absorbent surface.

409 8 2 4/02 8.5

ORIGINAL INSPECTED

2 3 ^r - 394

As a general rule, the diameter of the pits is in the range of about O, bjl to b, are ll mm. From the standpoint of aesthetic quality and Funktionsiähigkeit forth, it is preferred that the size of the depressions in the range of about I ₅ ¹ JO J ⁷ to about 3 mm for the SIO Durehmesser.

13 in yet another, but less preferred embodiment. form, the depressions are connected to the absorbent pad according to FIG. 1 in such a way as that shown in FIG is.

In the absorbent article of Figure 6, the slits 18 are substantially straight and in staggered parallel rows arranged and, as shown, recesses 22 are provided. Although improved according to this embodiment of the invention Absorbency, dimensional stability and absorbency is achieved, compared with conventional material, is the difficulty with the "zipper-like tearing", although significantly improved, still not completely eliminated.

In the following examples, a different test method than that used in relation to Examples 1 to 3 is described. Corresponding to that in the following. In the methods used in Examples, an open cylinder having an inner diameter of 101.6 mm is placed on a portion of the absorbent article. 30 ml of a liquid, such as water or a saline solution, is poured into the cylinder and the length of time it takes for this JO ml of liquid to be absorbed (which at a

409824/028 5

ORIGINAL INSPECTED

23 ¹ : 7394

Temperature of 35 to 38 C is kept) by the hydrophobic Film is required through it.

Example 4

An absorbent wadding consisting of eight layers of absorbent wadding Support with the approximate dimensions 305 x 406 χ 4.76 mm was made on a foil in the middle Polyethylene film with the approximate dimensions 311 χ 412 χ 0.032 mm laid, in which a taffeta-like pattern was embossed.

A 0.032 mm thick sheet of ethylene ethyl acrylate film was perforated by passing it through the gap between a roller with a plurality of small blades arranged in staggered parallel rows around the circumference of the roller and a resilient rear roller became. The perforating roller had approximately 125 cutting edges at 6.5 cm ", so the perforated P was also ¹ µm

approximately -125 parallel slots per 6.5 cm "of surface area, each slot having a length of approximately 2.54 mm.

The perforated film was cut into pieces with the approximate dimensions 311 χ 412 mm and placed this on top of the absorbent Vatte pad, creating the last sandwiched between the perforated film and the polyethylene film was enveloped. The edges of the enveloping material were then heat-welded.

The absorbent article was then placed under the cylinder and the wicking properties examined. For this 30 ml of a liquid, i.e. a 0.3 N sodium chloride solution, were added at body temperature (to simulate urine) in

409824/0285

ORIGINAL. iisSSPECTED

23: '. O394

cast the cylinder. Within Ik seconds, the liquid was completely absorbed through the topsheet by or in the absorbent material.

The topsheet was then carefully removed and placed on top of another identical absorbent material, and then sealed the edges again. The absorbent article was then put on with touching contact a roller passed, which with Lieizeinrichtungen and

ο
was equipped with about 10 pins per 6.5 cm which protruded the width of the roller and beyond its circumference. The diameter of the pins was 2.78 mm and the end point of the pins was spherical with a radius of curvature of approximately 1.389 mm. The absorbent article would be held by a resilient rear roller. Using a system that circulated hot oil at a temperature of 177 ° C, the pens were maintained at a temperature of approximately 150 ° C. The absorbent product obtained had approximately 10 depressions per 6.5 cm along the topsheet of the absorbent article. The absorbent article was then subjected to the same initial wicking and wicking test discussed above. It was found that within 1 * 1 seconds the liquid was completely absorbed into the absorbent material through the topsheet.

Example 5

This example shows that without closable openings no or almost no liquid through the wells in the Upper class passes through.

AO9824 / 0285

INSPECTED

An absorbent article was produced which essentially corresponded to the article according to Example h , with the difference that the slit was not formed. That is, the absorbent article corresponded identically to the article according to example k, but with the difference that the top layer had no closable openings (slits). According to the procedure of Example k, the water absorption of the absorbent article was examined. After a period of 3 minutes, no noticeable absorption of the liquid in the absorbent material was observed. The liquid remained as a whole on the surface of the topsheet. That is, essentially no liquid passed through the depressions in the topsheet.

Example 6 .

An absorbent pad made from eight layers of absorbent wadding approximately 305 x 406 χ ^; 1.6 mm was placed in the middle on a sheet of polyethylene film with the approximate dimensions 311 x 412 χ 0.032 mm, with a taffeta pattern embossed in the latter.

A 0.5 mm thick film made of ethylene ethyl aerylate film was used perforated by being brought into contact with a reciprocating rod which has a plurality of small cutting edges distributed over the surface of the reciprocating rod. The one with it

2 perforated film produced was approximately 72 per 6.5 cm parallel slots each about a length of about 2.03 mm.

40 9-8 24/0285

ORIGINAL INSPECTED

2 3 ^r - ■ ■ "· 3 9

The perforated film was then cut into pieces with dimensions of 311 χ kl2 mm and placed on top of the absorbent wadding pad, whereby this pad was sandwiched by the perforated film and the polyethylene film. The edges of the wrapping material were then subjected to heat welded.

The absorbent article was then placed under the cylinder (inner diameter 101.6 mm) and the properties when absorbing 50 ml of liquid (simulated urine) examined. Within 57 seconds, the liquid was completely through the topsheet and into the absorbent Absorbent pad.

The overcoat was then carefully removed and put on another, identical absorbent material was laid and the edges were welded again.

The absorbent article was then fed with "touching contact" past a roller which was equipped with a heating device and approximately 10 pins per 6.5 cm "", the pins protruding across the width of the roller and beyond its circumference Pins were 2.78 mm and the end point of the pins was spherical with a radius of curvature of about 1.3-9 mm. The absorbent article was held or supported by a flexible, rear roller. Using hot oil (177 ° C), which circulated in a corresponding system, the sticks were heated to a temperature of about 150 C. The absorbent product obtained in this way pointed along the upper

409824/0285

ORIGINAL INSPECTED

layer of the absorbent article about 10 depressions per 6.5 cm. According to the above procedure, the absorption properties of the absorbent Subject examined; it was found that the liquid was complete within 4 seconds through the topsheet and in the absorbent material was absorbed.

Example 7

An absorbent pad made of 8 layers of absorbent wadding with the approximate dimensions 305 406 χ 4.76 mm was made in the middle on a sheet of polyethylene film with the approximate Dimensions 311 χ 412 0.032 mm, with a taffeta pattern being embossed in the latter.

A 0.032 min thick sheet of ethylene ethyl acrylate film was made perforated by being in touching contact on a reciprocating rod with a multitude of small Cutting was passed; per 25.54 mm there were about 8 cutting edges across the surface of the 'reciprocating Pole distributed. The resulting film was unpleasant

65 parallel slots per 6.5 cm;
about 2.54 mm long.

65 parallel slots per 6.5 cm, each of which is un-

The perforated film was then cut into pieces with the approximated Dimensions 311 x 412 mm cut and these placed on top of the absorbent wadding pad, making the pad sandwiched by the perforated film and the polyethylene film. The edges of the enveloping materials were then welded under the action of heat.

409824 / 028S

INSPECTED

23 ^ 9394

The absorbent article was then placed under the cylinder (Inner diameter 101.6 mm) brought and the absorbent properties examined. The liquid was within 36 seconds has been completely absorbed through the topsheet in the absorbent material.

The topsheet was then carefully removed and placed on top of another identical absorbent material, and the edges welded again.

The absorbent article was then guided past a roller with touching contact which was equipped with a heating device and with approximately 10 pins per 6.5 cm, which protruded beyond the width of the roller and its circumference. The diameter of the pins was 2.78 mm and the end points of the pins were spherical with a radius of curvature of approximately 1.389 mm. In doing so, the absorbent article became more resilient, more rearward. Roller supported or held. ^{The pins were heated to approximately 150 °} C. by means of hot oil (177 ° C.) circulating in a suitable system. The absorbent product thus obtained had approximately 10 depressions per 6.5 cm along the topsheet of the absorbent article. The absorption capacity of the absorbent article was then examined in accordance with the method explained above; within 3 seconds the liquid (simulated urine) was completely absorbed through the topsheet into the absorbent material.

409824/0285

ORIGINAL INSPECTED

23-3394

-'kl -

Example 8

An absorbent pad made of 8 layers of absorbent wadding with the approximate dimensions 305 χ 406 χ ^ζ ι, 76 mm was placed in the middle on a sheet of Polyätliylenfilni with the approximate dimensions 311 χ 412 χ 0.032 mm, in which a taffeta-like pattern had been embossed .

A 0.032 ram thick sheet of ethylene-ethyl acrylate film was made perforated by being in touching contact on a reciprocating rod with a plurality of ■ small cutting was passed; per 25.4 mm of surface area of the reciprocating rod were about 9 small ones Cutting arranged. The resulting perforated film

had approximately 7B parallel slits per 6.5 cm of which each was approximately 1.778 mm in length.

i »ei · perforated film was then cut into pieces with approximated Dimensions 311 ~ x 412mm and cut this on top the absorbent wadding — pad placed, making this pad sandwiched by the perforated film and the polyethylene film. The edges of the enveloping Materials were then welded under the action of heat.

The absorbent article was then placed under the cylinder (inner diameter 101.6 mm) and the wicking properties were examined. The liquid was within 87 seconds (simulated urine) has been completely absorbed through the topsheet and into the absorbent material.

409824/0285

ORIGINAL INSPECTED

23 ^ 394

-.1 * 8-

The upper layer was then carefully removed and put on put another, identical absorbent material, and welded the edges again.

The absorbent article was then guided past a roller with touching contact, which roller was equipped with a heating device and approximately 10 pins per 6.5 cm "", the pins protruding beyond the width of the roller and its circumference. The diameter of the pins was 2.78 mm and the end points of the pins were spherical with a radius of curvature of approximately 1.389 mm. The absorbent article was held or supported by a flexible, rear roller. By means of hot oil (177 C), ^as I ^ ¹ * a suitable system circulated, the pins were heated to about 150 ° C. The absorbent product thus obtained pointed along the top layer of the absorbent

.-absorbing article about 10 wells per 6.5 cm ⁱ "in the procedure above was then examined the absorption capability of the absorbent article; within 5 seconds, the liquid (simulated urine) was completely absorbed through the topsheet and into the absorbent material been.

Example 9

An absorbent pad made of S layers of absorbent wadding with the approximate dimensions 505 χ 406 χ 4.76 mm was placed in the middle on a sheet of polyethylene film with the approximate dimensions 311 χ 412 χ 0.032 mm, in which a taffeta pattern had been embossed.

409824/0285

ORIGINAL INaFECTED

^23:: J394

A 0.052 mm thick film of ethylene-ethyl acrylate film was perforated ^{by passing the F 1} µm through a device as already described above on page 34 (such a device essentially consists of a piercing part and a rear part Part with a net-like outer surface, whereby the two parts are moved relative to each other). The rear part consisted of a wire screen with a mesh size of about 2 mm, while the piercing part consisted of a metal comb. The perforated film thus obtained had the appearance shown in FIG. 2 and had 81 slits per 6.5 cm, each of which was approximately 2.54 μm in length.

The perforated film was then cut into pieces with the approximated Dimensions 311 χ 412 mm cut and placed on top of the absorbent wadding pad, making the Was sandwiched by the perforated film and the polyethylene film. The edges of the enveloping Materials were then welded under the action of heat.

The absorbent article was then placed under the cylinder and the absorption properties were examined. Within by 4 seconds the liquid was completely absorbed through the topsheet and into the absorbent material been.

The topsheet was then carefully removed and put on another, identical absorbent material and an appropriate one put back foil, and the edges welded again.

409824/0285

ORIGINAL INSPECTED

23 ^ 394

The absorbent article was then passed, with touching contact, past a roller, which was equipped with a Lieiz equipment and approximately 10 pins per 6.5 cm ", the pins protruding beyond the width of the roller and its circumference. The diameter of the pins was 2, 78 mm, and the end points of the pins were spherical with a radius of curvature of about 1.389 mm. The absorbent article was held or supported by a flexible rear roller. Hot oil circulated in a suitable system was used to open the pins about 150 ° C. The absorbent product thus obtained had about 10 depressions per 6.5 cm "along the topsheet of the absorbent article. The absorption capacity of the absorbent article was then examined using the method explained above. Within 3.2 seconds, the liquid was completely absorbed through the topsheet and into the absorbent material.

Example 10

The procedure of Example 9 was repeated, but with the Difference that each of the slots was approximately 1.778 mm in length; all other conditions of manufacture and the investigation remained the same. The investigation leads to the following results:

Time for the liquid to be completely absorbed

Top layer without depressions Top layer with depressions 80 seconds 3 seconds

409824/0285

ORIGINAL INSPECTED

23: 3394-54-

The following Examples 11-15 demonstrate that the extent to which baby diaper !! according to the present invention liquid

Absorb 2, on the number of wells per b, 5 cm in the surface of the top layer can be influenced. In the previous investigations, the liquid was on the manufactured diapers poured while the with the liquid treated portion of the diaper was in a horizontal position. To get the actual wicking properties then present when a baby is wearing such a diaper, to simulate more realistically, the following research method was used elaborated:

Each of the diapers tested was placed on a board and clamped onto it, which formed an angle of ^L 15 ° from the vertical. A separatory funnel which dispenses 40 ml of liquid in 30 seconds was attached over the board so that the outflow end of the funnel ended 25 mm above the top of the diaper. The funnel was adjusted so that the liquid which emerged at the outlet end of the funnel fell on the topsheet of the diaper and covered a distance of 280 mm on this over the width of the diaper. The liquid consisted of aqueous 0.3 ni sodium chloride, which was at room temperature. Within a period of 30 seconds, the total amount of liquid of 50 ml emerged from the funnel, and the proportion of the liquid which had passed through the diaper was determined ran away, ie was not absorbed by the diaper.

All diapers tested were made from the same wadding material and made from the same roll of material for the top layer (ethylene-ethyl acrylate film). The examined

40 9 82.4 / 0285

ORIGINAL INSPECTED

23 ^r; -'i34

Diapers were made according to the method of Example 6,

ο with the difference that the number of wells per 6.3 cm ",

were varied as indicated below;

Three trials were run with each example (where jextfeils a different winch was used) and the provide the results listed in Table 1 below Mean values of these tests.

Table 1

example Indentations per 6.5 cm " 0 amount (ml) 11 r:
9 s 31 12th ο , 9 6th 13th k O
J " O lh 7th ,8th 0 15th ■ 9 0

The procedure of Examples 16 to 20 corresponds identically to the procedure of Examples 11 to 15, with the difference that the angle of the board was set to 60 °. The results obtained are in the following table II listed:

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ORIGINAL INSPECTED

235-394

Table II Example of depressions per 6.5 cm '

Amount of water collected (ml)

16 0 33 17th 2.5 10.8 18th ^, 9 ■ 't »3 19th 7.2 ■ 0 20th 9.8 0

The following example 21 demonstrates for a diaper which after
of the present invention was indented to maintain the increase in strength even when wet. For this purpose, an absorbent pad made of wood pulp flakes was used, since such flakes are from
Loss of wet integrity strength is greater
are affected as cotton wool.

The examination is carried out according to the following procedure:

A test device was used in which samples made of a composite base with the dimensions 101.6 χ 101.6 mm, as they were made for the investigation, twice as much their dry weight were moistened with water, and after a period of 1 minute for equilibrium was the pad under pressure between two circular flat metal rings made of aluminum with an open internal diameter of 88.9 mm recorded. The middle of the

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ORIGINAL INSPECTED

.23- ° 194

The bottom of the sample with a diameter of 88.9 mm held in this way rested on a first plate with a diameter of 38.1 mm, which was coated with 27 mm thick polyurethane cha to. A second plate with a diameter of 25.4 mm, which was also covered with 27 mm thick polyurethane foam, was located in the middle (above the first or bottom plate) and pressed the sample from above with a pressure of 0.9 kg / cm ", and the sample was additionally moistened with twice its dry weight in water; a minute passed again to adjust the equilibrium Rotate the plane of the sample while the second plate, which pressed from above on the upper surface of the sample, was set so that it rotated within an arc of 45 ° 55 times per minute The pores held in the long were torn out in a circle around the moving, central pressure plate (diameter 25.4 mm) th test with the described rotational movement ^for ten minutes, the test result was determined as the tearing out and visually rated with values from 0 to 3, with tearing rates greater than 1 being equivalent to unsatisfactory usability for actual use. The pull-out rates determined for the individual samples under test conditions have the following meaning:

Pull-out rate 1 - around the compressed area

were the tears overall at an angle of less than 10 ;

Pull-out rate 2 - around the compressed area

were the outliers overall at an angle of 10 to 90 °;

409824/0285

Often / GINAL INSPECTED

. 2 3 B "Ί 9 4 - 55 -

Leak rate 3 - around the compressed area

the outliers were overall at an angle above 90.

Example 21

An absorbent pad made of 30 g cellulose (of which 22 g iiolz cellulose flakes) with the approximate dimensions 3 (> 5 x Λ06 χ ^! I, 76 mm) was placed in the middle on a sheet of polyethylene film with the approximate dimensions 311 x ^ 12 χ 0.032 mm, whereby a taffeta pattern had been embossed into the latter.

One. 0.032 mm thick film made of .Lthylen-Ethylacrylat-Filin was has been perforated by being through the top of page 3 ^ described device had been performed. Uas rear Part consisted of a metal sieve with a clear mesh size of 2 mm, and the piercing part consisted of a metal comb. i) ex * the perforated film obtained in this way had the one shown in FIG

2 depicted appearance and had 81 slots on 6.5 cm, each of which was approximately 2.54 mm in length.

The perforated film was cut into pieces approximately 311 χ kl2 mm and placed on top of the absorbent pad, thereby sandwiching the perforated film and the polyethylene film. The edges of the enveloping material were then heat-welded. The diaper thus obtained was then subjected to the investigation described above to determine the wet strength (wet integrity), a tear rate of 2 being determined.

409824/0285 "

ORIGiNAL INSPECTED

Another diaper was produced identically according to the method described. The diaper was then touched Contact passed a roller, which with

ο a heating device and with about 10 pins per b.5 cm was equipped with the pins protruding beyond the width of the roller and its circumference. The diameter of the pins was 2.78 mm, and the end point of the pins was spherical with a radius of curvature of approximately 1.389 mm. The absorbent article was supported by a flexible, rear roller held or supported. Using hot oil circulated in a suitable system, were heated the pens to approximately 150 ° C. The absorbent product obtained thereby pointed along the overlayer of the absorbent Article has approximately 10 depressions per 6.5 cm ". This absorbent article subsequently became the subjected to the same test to determine wet strength; a runaway rate of 1 was found here.

Example 22. '

From the materials described in Example 9 and after a diaper was made there, however with the exception that the slits were 1.778 mm in length and the size of the depressions was one Corresponding to a radius of 2.387 mm. Following the procedure given in Example 9, the absorbency of this diaper tested, obtaining the following results:

With depressions in the without depressions in the upper class upper class

80 seconds h seconds

409824/0285

ORIGINAL INSPECTED

23 ^ 394

From the examples listed and the description of the present Invention clearly shows that the absorbent product of the present invention is superior Has qualities in view of the properties (a) to (d). Variations of the invention are possible, in particular the omission of such features that although they are not lead to an optimal product, as explained above, yet still lead to an improved product compared to conventional products Product lead. For example, the fibers in the absorbent pad do not have to be attached to the lowest sections of the indented areas are glued. There is a slight decrease in dimensional stability, however other advantages are not materially affected. That is, instead of the absorbent product, the process of manufacture which passes through the depressions, the top layer can be pretreated in such a way that it subsequently has indented areas and then such a topsheet is combined with the other components to form the end product result.

In the following claims, the term "depressions" is used for the indented areas. In the claims the term "depressions" is intended to relate to the indented areas above the surface of the top layer, which are below the level of the upper class, and which have been produced by such a process that in the course or after essentially no breaking, melting or cutting of the topsheet in such a manner during manufacture. Extent occurs, which hinders the controlled passage of the liquid to the absorbent pad. That is, the wells are essentially impermeable to the liquid.

40982 * 70286 OBQHIAl. INSPECTED

Claims (1)

Claims (lJ disposable absorbent article, consisting of: a non-fibrous hydrophobic film, as the side close to the body, with a variety of closable Openings in it, which through a wetted area of 130 cm of this film within 10 seconds at least Allow 20 ml of liquid to pass through; an absorbent pad adjacent to the film, which absorbs the liquid which has passed through those openings, which openings largely can be closed in order to prevent the absorbent material from touching the body and prevent backflow to inhibit the liquid from the absorbent pad. 2. Disposable absorbent article consisting of a hydrophobic topsheet, as the side close to the body, with a plurality of openings therein, one essentially liquid impermeable backing sheet, an absorbent pad between the topsheet and the rear slide showing the Absorbs liquid which passes through the openings, the openings largely closable are to prevent contact of absorbent material with the body and the backflow of in the absorbent Underlay to inhibit absorbed liquid, and that a system of depressions on the top layer 409824/0285 ORIGINAL INSPECTED 23 ^ 394 - 59 - is provided, with at least one recess 6.5 cm of the area of the absorbent pad. 3. Absorbent article according to claim 2, characterized in that that the plurality of closable openings consists essentially of straight slots which in parallel rows are arranged, each slot is arranged parallel to the longitudinal axis of these rows. H. Absorbent article according to claim 3, characterized in that each slot has a length of 1.778 to 5.08 mm and that there are 6.5 to 30 to 130 slots. 5.08 mm, and that on 6.5 cm top layer there is Absorbent article according to claim 2, characterized in, that the number of wells in the topsheet is approximately 1 to 100 wells a absorbent pad. approximately 1 to 100 wells per 6.5 cm area of the 6. Absorbent. Article according to claim 2, characterized in that that the number of depressions in the top layer about 3 to about 25 pods per 6.5 cm "area of the absorbent pad. 7. Absorbent article according to claim 2, characterized in that the number of depressions in the topsheet is approximately 6 to approximately 15 depressions per 6.5 cm area of the absorbent pad. 409824/0285 OfJlGlNAL INSPECTED :? 9 4 - 6ο - 8. Absorbent article according to claim 2, characterized in that that the total area occupied by the depressions 20 '< the area of the absorbent pad does not increase. 9. Absorbent article according to claim 2, characterized in that the total area occupied by the depressions h to 12 ⁽ , o of the area of the absorbent pad amounts to " 10. Absorbent article according to claim 2, characterized in that that the depressions are circular and have a diameter of approximately 0.635 to approximately about 6.35 n "". 11. Absorbent article according to claim 2, characterized in that that the wells are circular, with a diameter of about 1.905 to 3.81 mm. 12. Absorbent article according to claim 2, characterized in that that the plurality of closable openings consists essentially of parallel straight slots, which are arranged in longitudinal rows, each slot at an angle with respect to the longitudinal axis of that row and is arranged so that the end points of each slot lie on a line which is substantially runs between the endpoints of corresponding slots in adjacent spaces. 409824/0285 OFHGlNAL INSPECTED 2353394 13. Absorbent article according to claim 12, characterized in that the seat braid has a length of about 0.762
to about 6.35 now. lh. Absorbent article according to claim 12, characterized in that the slits have a length of about 1.778
to about 5 * 08 mm. 15. Absorbent article according to claim 12, characterized thereby
come. shows that there are 30 to 150 slits on a 6.5 cm upper layer l6. Absorbent article according to claim 12, characterized in that the number of depressions in the top layer
about 1 to 100 wells
absorbent pad. ο
approx. 1 to 100 depressions in a 6.5 cm area 17. Absorbent article according to claim 12, characterized in that the number of depressions in the top layer
about 3 to 25 wells
the underlay is. approximately 3 to 25 depressions per 6.5 'cm area absor- 18. Absorbent article according to claim 12, characterized in that the number of depressions in the top layer is about 6 to about 15 vertie:
absorbent pad. about 6 to about 15 wells per 6.5 cm "area 19. Absorbent article according to claim 12, characterized in that the total area occupied by the depressions is 20% of the area of the absorbent pad
does not exceed. 409824/0285 ORIGINAL JNSPECTED 20. Absorbent article according to claim 12, characterized in that the total area occupied by the depressions is k to 12 % of the area of the absorbent pad. 21. Absorbent article according to claim 12, characterized in that that the wells are circular are approximately 0.635 to 6.35 mm in diameter. 22. Absorbent article according to claim 12, characterized in that that the wells are circular are about 1.905 to about 3.81 mm in diameter. 23. Baby diaper for disposal, consisting of a hydrophobic top layer on the side close to the body, with a variety of Openings therein, a substantially liquid impervious back sheet, an absorbent one. Underlay between the topsheet and the backing film, this underlay absorbing the liquid, which passes through the openings, wherein the openings are largely closable to contact between the absorbent material to prevent the skin from flowing back into the absorbent pad to inhibit absorbed fluid, and with a system of depressions in the upper layer, whereby on 6.5 cm " there is at least one depression in the area of the absorbent pad; Top layer and back sheet, respectively a thickness of 0.0127 to 0.051 mm and substantially have the same dimensions, and at least partially 409824/0285 ORIGINAL INSPECTED 23. ^{ε Λ} 394 wise are mutually connected on their outer hand to form a unified diaper structure, in which the absorbent pad is essentially sandwiched between the topsheet and the backing film, and the closable Openings consist essentially of straight slots arranged in parallel rows, each Slot is arranged parallel to the longitudinal axis of the rows. 24. Baby diaper according to claim 23, characterized in that each slot is from about 0.762 to about 6.55 mm, and on 6.5 cm topsheet approximately 30 to come IyO slots. 25. Baby diaper according to claim 24, characterized in that the hydrophobic top layer made of ethylene-ethyl acrylate film consists, and that the absorbent pad consists of a stack of absorbent cotton layers. 26. Baby diaper according to claim 23, characterized in that the number of depressions on the hydrophobic top layer is about one to about 100 depressions per 6.5 cm area of absorbent pad. 27. Baby diaper according to claim 23, characterized in that ο the number of depressions in the Obex 'layer per 6.5 cm Absorbent pad area is about 3 to about 25 depressions. 09824/0285 ORIGINAL INSPECTED 3 - 28. Baby diaper according to claim 2 ?, characterized in that the number of depressions in the top layer per 6.5 cm " Absorbent backing area about 6 to about 13 wells, 29. Baby diaper according to claim 23, characterized in that the total area occupied by the depressions does not exceed 20 <; c of the area of the absorbent pad. 50. Baby diaper according to claim 23? characterized in that the total area occupied by the depressions is h to 12 ',.: of the area of the absorbent pad. 31. Baby diaper according to claim 23, characterized in that the wells are circular in shape, approximately 0.635 to 6.35 mm in diameter. 52. Baby diaper according to claim 23, characterized in that the wells are circular in shape, approximately 1.905 to 3.81 mm in diameter. 33. Baby diaper according to claim 23, characterized in that The top layer and the rear film are welded to one another around their circumference under the action of heat. ~ jk. Disposable baby diaper, consisting of a combination of the following: an iridrophobic upper layer, as the side close to the body, with a plurality of closable openings therein, which are essentially parallel, straight 409824/028 5 ORIGINAL 1?> IS? ECTED 2350394 There are slots that are arranged in longitudinal rows with each slot viewed along the longitudinal axis each iteifae forms an angle; at least one absorbent pad adjacent to the topsheet, which the through the openings absorbed and retained liquid that has passed through; a back sheet which is largely impermeable to liquids, adjacent to the absorbent sheet Layer opposite the top layer, the openings in the top layer being largely closable to to prevent contact between the absorbent pad and the body, and to prevent backflow of the To inhibit liquid from the absorbent pad, and xtfobei topsheet and backsheet essentially have the same dimensions and are at least partially connected to one another at their edges to form a unitary diaper structure in which the absorbent pad is substantially is sandwiched between the topsheet and the backing sheet; and a system of depressions in the top layer, whereby to 6.5 cm of the area of the abso. at least one depression is coming. to 6.5 cm of the area of the absorbent pad 409824/0285 ORIGINAL INSPECTED 2 3 ^c - "3 9 'Yeah. A baby diaper according to claim jh, characterized in that the slits are arranged in such a way that the eridpunits of each slit slit lie on a line which runs substantially between the end points of corresponding slits in adjacent rows, and that the lungs of the slits are approximately 0.762 to 6.35 mra. 3b. Baby diaper according to Claim 3 ² i », characterized in that there are approximately 1 to 100 depressions for every 6.3 an" of the area of the absorbent base, and that the top layer is connected to the bottom layer by heat welding the top layer to the bottom layer. 37. Baby diaper for disposal, consisting of a combination of the following components: a hydrophobic top layer, as the side close to the body, with a plurality of closable openings therein, consisting essentially of parallel straight lines There are slots, which are arranged in longitudinal rows each slot forming an angle with respect to the longitudinal axis of each row, and the slots are arranged so that the endpoints of each slot are on a line, essentially between the endpoints of corresponding slots in adjacent rows, and the length of the slots is about 0.762 to 6.35 Kim; 409824/0285 ORIGINAL ■ '. . 23-: 394 at least one absorbent pad, adjacent to the topsheet, which absorbs the liquid which passes through the openings and backlits; one that is largely impermeable to liquids back sheet, adjacent to the absorbent layer on the opposite side to the topsheet, wherein the openings in the topsheet are largely closable to prevent contact between the absorbent pad and the body to prevent the liquid from flowing back of the absorbent pad, and wherein the topsheet and backsheet essentially have the same dimensions and at least partially with each other at their edges by the action of heat are welded to form a unitary diaper structure in which the absorbent The backing is substantially sandwiched between the topsheet and the backing sheet is; and a system of depressions in the top layer, wherein to 6.5 cffl ~ area of the absorbent pad approximately one to about 100 wells come. 38. Baby diaper according to claim 37, characterized in that the number of wells in the topsheet per 6.5 cm area of absorbent pad is approximately 3 to 25 wells amounts to. 4098 2 ^ / 028 5 -: ■■ - ■, ORIGINAL INSPECTED 2359394 39 »Baby diaper according to claim 37» characterized in that the length of the slots is now approximately 1.778 to 5.08, kO. Baby diaper according to Claim 37, characterized in that the slits which are closest to the depressions are opened to a greater extent than slits which are further away from the depressions. St. Disposable baby diaper, characterized by the combination of the following components: a hydrophobic top layer as the side close to the body, with a large number of closable openings therein, which consist essentially of parallel, straight slots arranged in longitudinal rows with each slot forming an angle with the longitudinal axis of each row and being arranged so that the endpoints of each slot lie on a line that is substantially between the endpoints of corresponding ones Slots in adjacent rows, and the length of the slots approximately 1.778 to 5.08 mm amounts to; at least one absorbent pad adjacent to the topsheet which passes through the openings absorbed and retained liquid that has passed through; a system of depressions on the top layer, where ο
on b, 5 cm of the area of the absorbent pad there are about 3 to 23 wells; and 409824/0285 ORIGINAL IfMSPECTED 2353394 a back sheet, which is largely impermeable to liquids, adjacent to the absorbent layer on the opposite side, to the topsheet, with the slits in the topsheet that are closest to the wells being opened to a greater extent than the slits that come from the wells are further away, the slits are largely closable in order to prevent contact between the absorbent pad and the body and to inhibit the backflow of the liquid from the absorbent pad, the top layer and the backing film having largely the same dimensions and at least partially by the action of heat their edges are sealed to form a unitary diaper structure in which the absorbent pad is substantially sandwiched between the topsheet and the backsheet. 42. Baby diaper according to claim 41, characterized in that on 6.5 cm area of the absorber
up to 15 wells. on approximately 6.5 cm area of the absorbent pad 43. Baby diaper according to claim 37, characterized in that the total area occupied by the depressions does not exceed 20% of the area of the absorbent pad, 44. Baby diaper according to claim 37, characterized in that the total area occupied by the depressions 4 to / c of the area of the absorbent pad. 409 824/0285 ORIGINAL INSPECTED kj. A baby diaper according to Claim 57, characterized in that the depressions are circular and have a diameter of approximately 0. t>/> 5 to 6.33 nini. hb. Baby diaper according to Claim 37, characterized in that the depressions are circular and have a diameter of approximately 1.905 to "3.81 mm. k ~ {. Baby diaper according to Claim 37 5, characterized in that there are approximately 1 to 150 slits for each 6.3 cm "top layer. kS. Disposable baby diaper, consisting of a combination of the following components: a hydrophobic top layer as the side close to the body, with a large number of closable openings therein, which consist of substantially parallel straight slots arranged in longitudinal rows each slot forms a V / inc el with the longitudinal axis of each row and is arranged in such a way that that the end points of each slot lie on a line which is substantially between the end points corresponding slots in adjacent borrowed runs, the length of the slots approximately 1.778 to 3.81 mm and about 30 to 150 slots come to 6.5 cm "of the upper layer; at least one absorbent pad adjacent to the topsheet that passes through the openings absorbed and retained liquid that has passed through; and 409824/0285 OfIiGiNAL INSPECTED a system of depressions in the top layer, the depressions being circular and have a diameter of about 0.635 to 6.35 Mim, with that of the depressions Total area occupied 20% of the area of the absorbent pad. 49 · Baby diaper according to claim 48, characterized in that the total area occupied by the depressions is 4 to 12 ic of the area of the absorbent pad. 50. baby diaper according to claim 48, characterized in that the non-fibrous, hydrophobic top layer made of one Ethylene-ethyl acrylate film consists, and that the absorbent Pad consists of a stack of absorbent cotton sheets. 51 »Baby diaper according to claim 50, characterized in that the ethylene-ethyl acrylate film has a thickness of 0.0127 0.051 mm. 52. Baby diaper according to claim 48, characterized in that 2 the length of the slots is 2.54 mm, and there are approximately 81 slots for each 6.5 cm top layer. 53 · Baby diaper after. Claim 48, characterized in that those slots closest to the depressions are opened to a greater extent than Slots further away from the indentations. 9824/02 85 2358334 5 ^; i. Baby diaper according to claim h &, characterized in that the depressions have a diameter of approximately 1.905 to 3, Sl min. 55. Baby diaper for disposal, consisting of a combination the following components: an ethylene-ethyl acrylate film with a thickness of 0.0127 to 0.051 mm, as a top layer, for the side close to the body, with a plurality of closable openings therein, which consist essentially of parallel, straight slots which are arranged in longitudinal rows, wherein each slot forms an angle with the longitudinal axis of each row, and is arranged so that the end points of each slot lie on a line which runs substantially between the end points of corresponding slots from adjacent rows, the length of the slots is 2.5 * 1 mm , and up
more sl slots come; ο
2.5 * i mm, and on 6.5 cm of the upper layer un- at least one absorbent pad made of a stack of absorbent cotton layers, close to the topsheet, which soaks up and retains the liquid which has passed through the openings; and a system of depressions on the topsheet, the depressions being circular in shape and approximately 0.635 to 6.35 mm in diameter, the total area occupied by the depressions not exceeding 20 fc of the area of the absorbent pad, the diaper further thereby 0 9 8 2 4/0285 2353394 is characterized in that the wells on next lying slits are opened to a greater extent than seated slits emerging from the depressions are further away. 56. Baby diaper according to claim 55 »characterized in that 6.5 cm of the area of the absorbent pad about 1 to 100 wells come out. 57. Baby diaper according to claim 55 »characterized in that for every 6.5 cm of the area of the absorbent pad there are approximately 3 to 25 depressions. 58. Baby diaper according to claim 55 , characterized in that to 6.5 cdi "" of the area of the absorbent pad there are about 6 to 15 wells. 59 Baby diaper for disposal, consisting of a combination of the following components: a hydrophobic top layer, as the side close to the body, with a large number of closable openings therein, which are arranged substantially as parallel straight slots in longitudinal rows; at least one absorbent pad adjacent to the topsheet which passes through the openings absorbs and retains liquid that has passed through; 409824/028 5 OfHGINAL INSPECTED -Your- a rear film, which is largely impervious to liquids, adjacent to the absorbent one Layer on the opposite side to the topsheet, with the openings in the topsheet largely can be closed to prevent contact between the absorbent pad and the body and to inhibit the backflow of liquid from the absorbent pad, whereby overlay and back sheets have substantially the same dimensions and at least partially on their Are joined together to form a unitary diaper structure in which the absorbent The backing is essentially sandwiched between the topsheet and the backing sheet will; and a system of indented areas disposed on the topsheet, the lower portions of the indented areas extend below the level of the upper layer, and largely for liquids are impermeable, and are in non-adhesive relationship with the absorbent pad, wherein on 6.5 cm of the area of the absorbent pad comes at least one indented area. 60. Baby diaper according to claim 59, characterized in that the slits form an angle with the longitudinal axis of each row form, and are arranged so that the end points of each slot lie on a line which is substantially runs between the endpoints of corresponding slots from adjacent rows. 409824/0285 ORIGINAL INSPECTED