DE2948044A1 - Throwaway baby wraps - with swelling material pad between cellulose flock webs coated with paper - Google Patents

Abstract

An absorbent pad for hygienic purposes, e.g. for throw-away baby's wraps with an improved absorption capacity, includes at least one layer of a swelling material in addition to layers of plastic foil, fibre mat, cellulose flocks, tissue paper and/or crepe paper. The layer of swelling material is arranged loose as an interlayer between two pairs of cellulose flock webs. The pairs are joined to each other by seams of an adhesive. Tissue or crepe paper layers surround the cellulose flock layers on both sides. Napkin has enough absorption capacity to withstand several wettings during a night without exposing the baby to urine or stiffening the wrap.

Description

Absorbent pads for hygienic purposes

The invention relates to an absorbent pad for hygienic purposes, in particular a disposable diaper with increased absorbency that has a layered structure, at least one layer of swellable substances and further layers of plastic films, Fleece, cellulose flakes, tissue and / or crepe paper is made.

Absorbent pads of the aforementioned type have long been known and in one Described in a large number of literature references.

Efforts have also been made for a long time to improve the absorbency of such absorbent pads to increase. In particular, there was an urgent need for this in the field of disposable diapers before. The invention is therefore described below using the example of a disposable diaper, without limiting them to that.

Swelling substances within the meaning of the present application include Understand materials made from wet-crosslinked and etherified cellulose fibers may consist of the essentially water-insoluble fibrous salts of carboxymethyl cellulose are. The production of these materials is for example in DE-OS 19 12 740 described. Other modified swelling substances are disclosed in DE-OS 21 51 913, the DE-OS 23 57 079, DE-OS 23 58 150 and DE-OS 25 28 701 have become known. In all cases these are materials that form a hydrogel, whereby these hydrogels are several times their weight in aqueous liquid absorb can and do not release the absorbed liquid even under low pressures.

In the case of diapers, a distinction is made between day and night diapers.

The previous night diapers generally consist of one additional insert of cellulose flakes or a reinforced cellulose flake layer, to be able to absorb the greater amount of moisture.

However, there are already diapers known whose fibers with a are heavily treated on absorbent polymer that forms a kind of gel and thus the Binds moisture. Diapers of this type are for example in DE-AS 16 42 072 and DE-AS 22 08 126 described.

The swelling substances used are applied to the fibers of the absorbent pad sprinkled or dusted on, glued onto a sheet, by placing in gutters fixed in the absorbent pad, bound directly to the individual fibers of the absorbent pad or glued to the inner surfaces in flake form.

The disadvantage of all these options is that the diaper becomes relatively stiff as soon as it is wetted by liquid. These when wet Any stiffness that occurs is perceived by the mothers as not suitable for children, as well how many mothers compared to the gel-like mass that forms from the swelling substances, which is usually found in the upper layer of the diaper, developed a reluctance to have. Another disadvantage of the known diapers is that these swellable substances need a certain amount of time to remove the body fluid, i.e. generally urine, soak up, this time being between 1 and 5 minutes. In the case of an infant diaper So the baby is more or less surrounded by urine for several minutes.

As can be seen from DE-AS 22 O8 126, the humidification the diaper causes swelling of the swellable substance particles, which then becomes coherent form gel-like layer which is impermeable to liquids, i.e. that in particular with night diapers the most undesirable phenomenon occurs that already after the first wetting of the diaper, a passage of urine into the absorbent pad and a Distribution of the urine in the absorbent pad can no longer take place because the gei layer acts as a barrier and can only slowly bind additional amounts of urine.

The present invention is therefore based on the object of a To create a diaper with increased absorbency that is used as a night diaper can be exposed to repeated wetting at longer intervals can without the infant remaining in direct contact with the urine for a long period of time, the diaper stiffens significantly and the gel formation can be felt.

This task is solved by a suction pad for hygienic purposes, in particular by a disposable diaper with increased absorbency that one layer by layer Has structure, with at least one layer of swellable substances and further layers consist of plastic film, *, fleece, cellulose flakes, tissue and / or crepe paper, with the characteristic feature that a swellable material web is not fastened as an inner layer is arranged between two interconnected pulp fluff webs.

By executing the swellable substances as a swellable substance web, so not more than powder or granules first of all in the manufacture very easy to use. Furthermore, compared to the previously usual fastening of the swelling substance by gluing or binding, e.g. by means of water, to the windldeck or - underlays or on the diaper pad made a very significant advance, because in all of these binding processes a considerable part of the absorption capacity the swelling substances is lost due to the type of binding or the binding agent. Opposite to the advantage results from scattering or dusting without any attachment the even distribution of the swelling substances that dust when sprinkled on or on is not guaranteed because every diaper treated in this way both during transport is also exposed to movements later when worn, which causes the original even layer of dust compacted at certain grooves, and different from others completely detached.

The introduction of the swellable material web as an inner layer between two pulp curls does not affect the rigidity of the diaper as a whole. The soft diaper handle so remains. Furthermore, the gel state of the swollen swelling substance is also important no longer noticeable.

The most essential advantage of the invention, however, lies in the layered structure in which the urine is immediately absorbed by the capillary action at the interfaces and is then distributed in the pulp fluff webs. These pulp fluff webs are in direct contact with the swellable substance web, so that the swellable substance web is in full-surface contact with them, as a result of which the liquid is absorbed evenly and quickly from the two pulp fluff webs. This direct contact the pulp curl webs with the swellable web are of considerable importance. Tests with swelling substance granulate or swelling substance powder have shown that liquid is only absorbed when there is direct contact between the swelling substance and a wetted surface. If swelling granulate is poured onto a watch glass partially filled with water, the granulate forms several layers one on top of the other. Since the bottom layer is directly in the water, the water is soaked up relatively quickly, up to the maximum absorption capacity of the swelling substance granulate. An astonishing phenomenon can be observed, namely that the swollen granules, after the absorption process has been completed by saturation, rests in the form of boulders in the water and on top of this swollen granules there is another layer of granules that does not yet swell at all. The contact of individual swelling substance particles with one another does not yet lead to the complete absorption of liquid, but it must be ensured that the liquid has direct access to each individual swelling substance particle. This contact is already improved when the swellable substance is designed as a swellable web in which the swellable substances are connected to one another in fiber form and is perfected by the interposition of this web between two further webs due to the capillary effect.

It is particularly advantageous if the pulp fluff webs are covered on both sides with a tissue or a layer of crepe paper, because through these layers increase the capillary action.

The swelling material web is preferably fixed in that the pulp curl webs are connected to one another by two glued seams. the Glued seams form the side fixation, which prevents the swelling material from escaping Prevent gel formed without reducing the absorbency of the swelling substance will. The Quelistoff is only in the median and is exposed arranged between the two adhesive seams, so that the moisture from all areas has free access to the swelling material web.

The invention is described below with reference to the drawing.

A plastic sheet 1 made of polyethylene is made with a dot matrix 2 provided from a hot glue and glued to a cellulose flake mat 3, the is covered with tissue layers 6. The upper tissue layer 6 has two adhesive seams 4, which extends as a broken line over the entire length of the wind.

The swellable material web is located in the space formed by the adhesive seams 4 5 arranged by a further cellulose flake mat 3, which is also made with tissue layers 6 is covered, is covered. The adhesive seams 4 connect the two pulp flake mats 3 with each other, so that the swellable material web 5 is in direct contact with the tissue layers 6 of the pulp curl mats 3 is available. The absorbent pad thus formed is covered with a nonwoven web 7 covered, which is glued to the plastic film web 1 in the edge regions 8.

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Claims (4)

Claims 1. absorbent pads for hygienic purposes, in particular Disposable diaper with increased absorbency, which has a layered structure, at least one layer of swelling substances and further layers of plastic film, Consist of fleece, pulp flakes, tissue and / or crepe paper, characterized in that that a swellable material web (5) unattached as an inner layer between two with each other connected pulp lock webs (3) is arranged. 2. absorbent pad according to claim 1, characterized in that the pulp curl webs (3) are covered with a tissue or crepe paper layer (6). 3. absorbent pad according to one of claims 1 and 2, characterized in that that the Zeilstoffiockenbahnen (3) are connected to one another by two glued seams (4) are. 4. absorbent pad according to one of claims 1 - 3, characterized in that that the swellable material web (5) is arranged between the adhesive seams (4).