DE3029290A1 - ABSORBING OBJECT, IN PARTICULAR MONTHLY BINDING - Google Patents

Description

PATEN TANWÄLTE

J. REITSTÖTTER

PROF. DR. DR. DIPL. ING.

W. BUNTE (1958-1976) DR. ING.

W. KINZEBACH

DR. PHIL·. DIPL. CHBM.

K. P. HELLLER

DK. RER. NAT. DIPL. CHEM.

TELEPHONE: (089) 37 83 TELEX! B21B2O8 ISAR D

BAUERSTRASSE 22, 80OO MUNICH 4O

Munich, August 1, 1980

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187
188

L ¹ OREAL 14, rue Royale

F-75 381 Paris (France)

Absorbent r item, especially sanitary napkin

POSTANSCHIBTi POSTPACH 78Ο, D-80O0 MUNICH 43

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The invention relates to an absorbent article, in particular a sanitary napkin that, despite its small thickness, has a high absorption and retention capacity for body fluids owns.

In the French patent 70.46473 a sanitary napkin is already described, which has an outer, soft layer made of natural fibers. This layer surrounds a central core, which consists of one layer: from dry-defibrated and after layering there is compressed wood cellulose. The compression reduces the The space between the fibers and gives the ply a large capillarity and consequently a large one Rate of diffusion for body fluid. The presence such a layer of compressed, dry-fiberized wood cellulose enables the diffusion and the Distribution of body fluid in the total mass of the absorbent article. Even if the body fluid is up a "single zone of the compressed layer hits, the absorbed liquid is quickly distributed both in the width and in the length of the article. This will any local saturation of the core and consequently any risk of leakage of the body fluid avoided.

In the French patent application 76-36994 an improved sanitary napkin was also described, the central The core does not just contain a product that facilitates the diffusion and distribution of the liquid to be absorbed in the

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Allowing total mass of the core, but also mixed with this product that allows diffusion Contains product that enables strong storage and swells upon contact with body fluid, so that the latter is retained inside the absorbent article.

The sanitary napkin according to the invention has the components of the two aforementioned pads. However, these components are arranged in a different way and combined with elements, which do not get wet. These elements are located

on the side of the bandage that comes with

comes into contact with the user's body. This sanitary napkin has three properties. It absorbs quickly the body fluid, detain them liquid even when the binding is slightly compressed, and gives the impression that they _at: remains dry use. ^: In fact, the binder according to the invention has in comparison to known and to heute.verwendeten sanitary napkins has a structure that enables the steering and distribution of body fluids to the rear side of the napkin, so that the active side of the napkin which comes into contact with the user's body stays dry even after use. ^: This sanitary napkin is therefore very comfortable for the user. In addition, thanks to its improved absorption and retention properties for liquids, the sanitary napkin according to the invention can be thinner than the usual sanitary napkins, so that perfect protection is ensured even in the event of strong leaks of liquid.

The object of the present invention is to provide an absorbent. To create an item that can be used as a sanitary napkin can be, this object has a substantially parallelepiped shape and a layer in its interior from dry fiberized and compressed after layer formation

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having technical cellulose, which is characterized in that the absorbent article, if one of the active Side / on which the body fluid to be absorbed meets, to the opposite or rear side, a permeable fleece that absorbs the Wrapped object, a permeable sheet, a first layer of dry-fiberized technical wood cellulose, a second layer made of dry fiber and after the layer formation compressed technical wood cellulose, the first layer either not compressing after the layer formation or has been slightly compressed compared to the compression to which the second layer has been subjected, a product, that holds back the body fluid to be absorbed well, an underlying product that is the aforementioned Product supported with strong retention force, and has a sheet impermeable to body fluids.

In a preferred embodiment, the covering of the absorbent article consists of a nonwoven made of hydrophobic material Fibers. The permeable sheet also consists of a non-woven fabric made of hydrophobic fibers. The impermeable sheet consists of Plastic, such as B. polyethylene, this sheet is folded around the inner mass of the bandage and its two Longitudinal edges are glued to the two corresponding edges of the permeable sheet. The second layer off technical wood cellulose is compressed to such an extent that its volume after compression by 2 to 5 times and is preferably 3 times less than the volume before compression. The specific gravity of the second The technical wood cellulose layer is between 0.15 g / cm and 0.35 g / cm and preferably between 0.20 g / cm and 0.30 g / cm. The second layer of technical wood cellulose is made slightly damp and then slightly compressed, for example with a press or in a calender, and optionally dried if the moisture is more than 10%. The first layer of technical wood cellulose,

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the second compressed layer and carrier sheet for the high retention product then become folded and wrapped with the impermeable sheet. The whole thing is then cut lengthways to get the core of the Obtain bandage. The weight per square meter of the first layer of technical wood cellulose is 200 to 300 g / m. The high retention product is applied to the carrier sheet, which consists of hydrophilic fibers, glued and lies either in the form of particles or in the form of a Tab in front. On the back of the absorbent

At least one longitudinal adhesive strip is attached to the object, which is covered with a tear-off protective sheet.

That for the production of the "absorbent according to the invention The product which can be used and has a high retention capacity is selected from carboxymethyl cellulose and graft copolymers of polyacrylonitrile starch, carboxymethyl starch, cellulose modified by grafting or crosslinking and acrylic copolymers.

As carboxymethylcellulose, there can be mentioned those manufactured by the company "Bukeye Cellulose Corporation" under the trade name "CLD", by the company "National Starch" under the trade name ' ¹ PERMASORB · 3θ "by the company" CECA "under the trade name" ALGINATE ", by the company" British Celanese "under the trade name" BIBOULOUS FIBRES - REFERENCE A "and by the company" Hercules "under the trade name" AQUALON ". A carboxymethyl cellulose of this type can be in the form of a powder, in the form of fibers, finely ground fibers, ie with a length of less than 1 mm, in the form of granules or a sheet with a fibrous structure. This carboxymethyl cellulose, consisting of fibers, can swell in water and absorb up to 25 g of water per g of fiber absorbed

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Water can from these fibers of carboxymethyl cellulose, even if they are of a relatively high compression are exposed, are well stored.

As a product with strong retention, one can also use a Use graft copolymer made of polyacrylonitrile starch, which can swell in water. In particular, you can have a Graft copolymer made of polyacrylonitrile and starch with a aqueous base hydrolyzed-was, use, the Nitrile group has been converted to a mixture of carboxyamides and alkali metal carboxylates. After that Copolymer has been dried as a carboxylate in the form of a film, this polymer can be many times its own Absorb their own weight in an electrolyte solution that is composed like urine. One such absorbent can be used either in the form of a film or in the form of particles.

As carboxymethyl starches, used as a product with strong retention can be used, one can name those sold by the company "Doittau France" under the trade name "'" SUPER-SLURPER ".

As cellulose fibers modified by grafting or crosslinking, which can be used as a high retention product can be those with polyacrylonitrile call grafted cellulose.

It is found that the diffusion of body fluid in the absorbent article according to the invention is very weak on the active side and on the back of the absorbent article becomes very strong. It is exactly different with a classic, absorbent article. The diffusion of the body fluid is much stronger on the active side of the absorbent article.

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In the case of the bandage according to the invention, the absorbent penetrates Body fluid first the permeable covering, which is not wettable due to its hydrophobic fibers, and then the permeable sheet, which is also not wettable. The interaction of these two layers prevents that the moisture that had previously penetrated the bandage escapes again.

Then the body fluid traverses the first layer of dry defibered wood cellulose. The body fluid ■ is only slightly absorbed by this position. This situation is not compact enough to the body fluid to retain and distribute on their ^r genzen surface. The body fluid then comes to the second layer of dry-fiberized wood cellulose that has been compressed after the layer formation. This second layer has a large capillarity, which means that the body fluid penetrates quickly into this layer and is well distributed:. In addition, this second layer absorbs the body fluid very well and prevents the first layer from being wetted.

Under this second compressed layer is the

Product with strong retention capacity, e.g. made of a flap Carboxymethyl cellulose fibers. These own a big one

; Absorbency / however, this absorption takes place only slowly instead of. Their large absorption capacity allows the sanitary napkin to be used for a longer period of time as it. too fast a saturation avoids the compressed position and any reproduction of

ι body fluid, even under a slight pressure, ^comparable: prevent.

The following drawings are provided to aid understanding of the present invention.

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From the drawings show:

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

FIG. 2 shows an enlarged schematic section along II-II of FIG. 1.

The sanitary napkin of FIG. 1 is essentially parallelepiped in shape with small thickness. It has a length of approximately 23 cm, a width of approximately 7 cm and a Thickness of about 0.5 cm.

The bandage consists of a sheet 2 made of fleece, the outside of which

2 2

m weight is approximately 15 to 20 g / m. It is permeable but not wettable because it consists of hydrophobic fibers.

The side 3a of the permeable envelope 2, the active side of the napkin is, by penetrating the body fluid. · ^The opposite side 3b, which should not come up with the user's body in contact is about with an adhesive strip having a width of 35 mm equipped. This adhesive strip is covered with a protective sheet 5, which consists of silicone paper and can be torn off by the user at the moment of use. The adhesive strip 4 serves to attach the sanitary napkin 1 to the inner surface of the supporting garment.

Under the 'active side 3a there is a permeable one Sheet 6, which also consists of hydrophobic fibers. As the hydrophobic fibers used for the envelope 2 or the sheet 6 The following synthetic fibers can be named: polyester, polypropylene, polyamides, polyacrylics and polyvinyls.

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2 '2

The sheet 6 has an m weight of approximately 10 to 20 g / m 2.

Under the sheet 6 are two superimposed layers of technical wood cellulose 7 and 8. The first layer 7 has a

2 2

m -weight of about 220 g / m. It is made by shredding a bleached paper pulp, which is boiled in digestion liquor has been obtained, won.

The second layer is composed in exactly the same way as the first layer 7, but it differs in terms of fiberization and layering. The layer is compressed to such an extent that the volume of the compressed layer is 3 times less than the volume of the same layer before compression. The compressed layer 8 has a density of approximately 0.5 g / cm

Under the second layer of compressed technical wood cellulose 8, a layer 9 of a high retention product is attached. This layer is 9 cm long and 2.5 cm wide. It consists of carboxymethylellulose fiber ("CLD" fibers from "BUCKEYE CELLULOSE CORPORATION") and its weight is about 0.6g.

The layer 9 is on a carrier sheet 10 made of hydrophilic Fibers glued. The carrier sheet 10 enables a seal Contact of the film 9 with the second layer of technical wood cellulose 8.

Finally, the permeable sheet 6, the two layers 7 and 8, the layer 9 and the carrier sheet 10 are impermeable Sheet 11 made of plastic wrapped, however, the envelope not on the central zone of the permeable sheet 6 is present. The wrapping impermeable sheet 11 is glued to the two longitudinal edges of the permeable sheet 6.

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It should be emphasized that the structure of the sanitary napkin 1 enables the body effluents to be directed toward the back 3b of the napkin to direct and distribute. The active surface 3a remains completely dry after use and conveys the user the impression of having less severe losses. The sanitary napkin according to the invention is thus very comfortable and to wear very discreetly due to their small thickness, but with a strong absorption and retention capacity owns.

111 / Hch

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Claims (10)

M / 21 187 M / 21 188 claims 1. Absorbent article, especially as a sanitary napkin usable, with essentially parallelepiped shapes, the inside a layer of dry fiberized and after the layering of compressed technical wood cellulose has, characterized in that the absorbent article, when looking from the active side to which the absorbent. Body fluid meets, goes to the opposite or rear side, a permeable fleece that envelops the absorbent object on the outside, a permeable sheet, a first layer of dry fiberized technical wood cellulose, a second layer of dry fiberized and after the layer formation compressed technical wood cellulose, the the first layer after the layer formation has either not been compressed or has been slightly compressed, compared; with the compression to which the second layer has been subjected: a product that well retains the body fluids to be absorbed ■ a sheet underneath that supports the aforementioned product with strong retention, and one for body fluid. has impermeable sheet. '._ 2. Article according to claim 1, characterized in that the product with strong retention capacity is selected from carboxymethyl starches, carboxymethyl celluloses, graft copolymers of polyacrylonitrile starch, modified by grafting or crosslinking 130013/0987 M / 21 187 - 2 - M / 21 188 Cellulose and acrylic copolymers. 3. Article according to claim 2, characterized in that that the product with strong retention capacity on the carrier sheet, which consists of hydrophilic fibers, and in the form of either a chunk or a tab, is glued. 4. Article according to one of claims 1 to 3, characterized characterized in that the covering surrounding the object is made of a fleece which is at least 50% hydrophobic Has fibers, consists. 5. Article according to any one of claims 1 to 4, characterized in that the permeable sheet consists of a Fleece consists of at least 50% hydrophobic fibers. 6. Article according to one of claims 1 to 5, characterized characterized in that the impermeable sheet is made of plastic and folded around the interior of the article with its two longitudinal edges glued to the corresponding two edges of the permeable sheet. 7. Object according to one of claims 1 to 6, characterized in that the second layer is compressed to the extent that it is becomes that their volume after compression is 2 to 5 times less than the volume of the same Location before compression. 8. The article according to claim 7, characterized in that the specific weight of the second layer consists of technical cellulose is between about 0.15 g / cm and about 0.35 g / cm. 130013/0987 M / 21 187 - 3 - M / 21 188 9. Article according to one of claims 1 to 8, available in that the second layer of technical wood cellulose is slightly dampened and then lightly is compressed and optionally dried, if the humidity is approximately more than 10% that the first layer of technical wood cellulose, the second compressed layer and the carrier sheet for the product placed on top of one another with strong retention, then covered with the sheet impermeable to body fluids and finally cut lengthways, so that the object is obtained. 10. Article according to one of claims 1 to 9, characterized in that the first layer of technical wood cellulose has a weight per square meter between approximately 200 g / m ² and approximately 300 g / m. 130013/0987