MXPA97007367A - Sanitary product of cellulose, liquid absorbent - Google Patents

Abstract

The present invention relates to a cellulose sanitary product, liquid absorbent, in particular a diaper, sanitary napkin or the like, comprises a liquid-proof backing layer (2) and an absorbent body (3). A storage layer (5) is placed on the absorbent body (3) and the backing layer (2), this storage layer (5) consisting of a layer of nonwoven material (6) profiled in the thickness direction (D) of the product by impressions (7) in the form of a chamber that are formed, inside each of which super absorbent hydrogel particles are inserted (

Description

SANITARY CELLULOSE PRODUCT. ABSORBENT OF LIQUID The invention relates to a liquid absorbent cellulose health product, such as diapers, sanitary napkins or the like, provided with a liquid-proof backing layer and an absorbent body. This may consist of a cellulose flake pad or a so-called air-laid material in the usual manner. This is used in particular for thin cellulose sanitary products, such as sanitary napkins or panty liners. Moreover, it is known from the state of the art to insert the so-called super absorbers in the cellulose sanitary products with the purpose of improving their absorbent capacity and their liquid retention capacity. As is generally known, said super absorbers, ie super absorbent hydrogel particles, are for example injected in the stream of flakes to form an absorbent body, in such a way that the hydrogel particles are distributed in the volume of the absorbent body. The insertion and distribution of the hydrogel particles is especially problematic, as a uniform distribution over the total base of the cellulose product is not desired. In contrast, most of the hydrogel particles should be located where the greatest accumulation of liquid is expected during the use of the cellulose product. In addition, the use of hydrogel is limited, while a too high hydrogel concentration causes the so-called "gel blocking" effect, the blocking effect of the swollen particles prevent any additional liquid absorption, as well as their transportation to areas of the absorbent body not yet supplied with liquid. Another substantial disadvantage of the conventional insertion of hydrogel particles in cellulose sanitary products is that the hydrogel particles can scarcely be localized, their migration being undefined during insertion and subsequently, in such a way that a distribution is often obtained. of disadvantageous particles. Therefore, the hydrogel particles can not reach their total absorbent capacity. Based on the deficiencies mentioned, it is an object of the invention to improve the structure of the cellulose sanitary products of the generic type, in such a way that a defined hydrogel particle insertion is possible. This object is achieved by the aspects of the characterizing part of claim 1. Accordingly, a storage layer is disposed between the absorbent body and the backing layer, the storage layer consisting of a layer of nonwoven material profiled in the direction of the thickness of the product by impressions in the form of a chamber that are formed, into which super absorbent hydrogel particles are inserted. By means of this structure, the super absorbent hydrogel particles are placed exactly in the desired target areas of the cellulose product and are kept there. In this way, the loss of hydrogel material during production is reduced. Moreover, the storage layer obtained in this way makes it possible to reduce the thickness of the absorbent body, so that, for example, a material placed by very thin air can be used. The actual storage of body fluid takes place in the same storage layer. Together, this favors the construction of thin cellulose health products at low material consumption. Additional features, details and advantages of the invention can be taken from the subclaims or the following description, respectively, in which a modality of the subject matter of the invention, taken in combination with the attached drawings, is explained, in which: Figure 1 shows a partial vertical section through a diaper, Figure 2 shows a plan view of the non-woven layer forming the storage layer, and Figure 3 shows a schematic view of a production arrangement for the storage layer with the backing layer. As can be seen from Figure 1, a diaper designated in its entirety by 1 comprises a liquid-proof backing layer 2 consisting of a thin film of polyethylene, an absorbent body 3 formed of cellulose flakes or material placed by air , and a core layer 4 consisting of a nonwoven material. Between the backing layer 2 and the absorbent body 3, a storage layer 5 is arranged, consisting of a non-woven layer 6 profiled in the thickness direction D of the diaper 1. By means of this profi, impressions 7 are formed in camera shape in the non-woven layer 6, whose impressions are in the form of caps when viewed from above (Figure 2). The super absorbent hydrogel particles 8 are applied inwardly, facing upwards, of the impressions 7 in a manner that they still remain to be specified. By means of the structure of the aforementioned storage layer 5, the hydrogel particles 8 are virtually inserted into the defined chambers formed by the impressions 7. The combined chamber volume of all the impressions in the diaper 1, is designed such that can capture at least a desired quantity of liquid that may occur. Moreover, the individual camera-shaped impressions 7 in the storage layer 5 can vary in volume, depending on the amount of expected liquid that occurs in a certain area of the diaper. For example, the impressions 7 arranged in the escutcheon area of the diaper 1 have a greater volume than those in the front, back and side.

The amount of hydrogel particles 8 inserted into the individual impressions 7 will be advantageously designed, such that the hydrogel particles, after absorption of the body fluid, fill the impressions 7 without the occurrence of the gel block. Accordingly, the smaller impressions 7 in areas of low liquid accumulation will be provided with a smaller amount of hydrogel particles 8. In order to ensure a secure insertion of the hydrogel particles 8 within the impressions 7, a layer is applied of cover 9 to the non-woven layer 6, whose cover layer 9 can be a separate non-woven layer or the absorbent body 3 itself in the form of a relatively firm air-laid material. The separate cover layer 9 can be seen in Figure 3. In order to join the non-woven layer 6 to the cover layer 9, a glued seal 10 is applied, which surrounds the print 7. In this way, the layer does not woven 6 and cover layer 9 form a type of laminate. The splice or joint can also be made mechanically, for example, by pressing the non-woven layer 6 and the cover layer 9. In this way, the penetration of the liquid through the overall structure and the absorbing capacity in this way is not reduced as well as with the gasket 10 mentioned above. Figure 3 shows a production arrangement for the storage layer 5. The core of the arrangement is a pair of embossing (embossing) rolls, which consist of an upper roller 11 and a lower roller 12. The upper roller 11 comprises embossing heads 13 in the form of spherical segments, considering that the lower roller 12 is provided with the corresponding cap-like impressions 14. The non-woven layer 6 maintained on a supply roller 15 runs through a deflection pulley 16 and continues through the space between the upper roller 11 and the lower roller 12. By means of the embossing heads 13 of the upper roller 11, which engage with the impressions 14 of the lower roller 12, the impressions 12 are enhanced in the non-woven layer 6.

The upper roller 11 at the same time serves as a transfer roller for the insertion of the hydrogel particles 8 into the impressions 7. For this purpose, as can be seen from the enlarged detail in Figure 3, the embossing heads 13 can be electrostatically charged and electrically isolated from the roller body by means of an insulating layer 17. During rotation of the upper roller 11, the electrostatically charged embossing heads are immersed in a reservoir 18 filled with hydrogel particles 8. Depending on the electrostatic charge, a defined amount of hydrogel particles 8 is collected during the immersion and, in the space between the rollers , is transferred to the non-woven layer 6 within the impressions 7 enhanced simultaneously. Downstream of the pair of rollers 11, 12, a spreading roller 19 of glue is placed, which spreads the glue on the raised areas surrounding the impressions 7, for the production of glued joints 10. Downstream of it is placed a roller of glue. pressed 20, which, like the spreader roller 19, cooperates with the lower roller 12. The cover layer 9, after being removed from the supply roller 15, is supplied through the pressing roller 20 and is glued together in this manner with the non-woven layer 6. In order to keep the non-woven layer 6 in contact with the lower roller 12 during its travel on it, the non-woven layer 6 is fixed by vacuum operation. To recapitulate, the present invention has the following advantages: Contrary to the state of the art, where only horizontally delimited cameras are used, for the subject matter of the invention additional cameras, which extend vertically, that is to say, in the direction of the thickness of the product of cellulose, they are produced in the shape of the impressions 7. Therefore, the effectiveness of the absorbent materials is improved, as they are placed in an exact and fixed manner in their position in the product in order to achieve the optimum characteristics of the product. In particular, the super absorbent particles of hydrogel 8 can not migrate to the areas, where they can not be used for the total capacity. The construction allows a greater pressing of the cellulose product and in this way a reduction of the package volume. The thickness of the absorbent body can be reduced, in such a way that thinner medical devices can be produced. Production losses are avoided, as they occur, for example, during loading with hydrogel particles from the stream of flakes forming the absorbent body.

Claims (6)

1. A cellulose sanitary product, liquid absorbent, in particular a diaper, sanitary napkin or the like, comprising a backing layer (2) liquid-proof and an absorbent body (3), characterized in that a storage layer is placed ( 5) between the absorbent body (3) and the backing layer (2), this storage layer (5) consists of a layer of nonwoven material (6) profiled in the direction of the thickness (D) of the product (diaper 1). ) by impressions in the form of a chamber that are formed, in each of which super absorbent hydrogel particles (8) are inserted.

2. A cellulose sanitary product, liquid absorbent, according to claim 1, characterized in that the impressions (7) are in the form of caps.

3. A cellulose sanitary product, liquid absorbent, according to claim 1 or 2, characterized in that the volume of the impressions (7) and / or the amount of super absorbent particles of hydrogel (8) inserted, varies with respect to the surface of the cellulose product (diaper 1), depending on the local liquid event.

4. A cellulose sanitary product, liquid absorbent, according to one of claims 1 to 3, characterized in that the surface areas, surrounding the impressions (7) of the non-woven layer (6), are connected with a cover layer (9), preferably formed by the absorbent body (3).

5. A cellulose sanitary product, liquid absorbent, according to claim 4, characterized in that the cover layer (9) is glued together (glued joint 10) or mechanically connected to the non-woven layer (6).

6. A cellulose sanitary product, liquid absorbent, according to one of claims 1 to 5, characterized in that the hydrogel particles (8) can be inserted, during the embossing of the non-woven layer (6), within of the impressions (7) by means of an embossing roller (upper roller 11) with electrostatically charged engraving heads (13) that collect the hydrogel particles (8) from a reservoir (18).