DK152007B - HYGIENE BINDING AND PROCEDURE FOR ITS MANUFACTURING - Google Patents

Description

The present invention relates to a sanitary napkin of the kind set forth in claim 1.

German publication publication DE-OS 21 63 295 discloses a sanitary napkin which has. a flexible outer layer of natural fibers. This layer surrounds a central core consisting of a layer of dried up and after layer formation compressed wood cellulose. The compression has the effect of reducing the fiber gap. This layer therefore has a high capillarity and allows the body fluid to diffuse at high velocity. The presence of such a layer of compressed, dry wood cellulose allows the diffusion and distribution of body fluid throughout the mass of the absorbent article. Thus, although the supply of body fluid is applied to a single zone of the compressed layer, the absorbed liquid is rapidly distributed both longitudinally and in the width of the binder, thereby avoiding any local saturation of the core and thus any risk of release of body fluid.

French Patent 2,373,274 discloses a sanitary napkin whose central core contains a product which allows diffusion and distribution of the liquid to be absorbed into the total core. Mixed with this product is an additional product which, upon contact with body fluid, swells up and stores the fluid, so that the body fluid is retained in the interior of the sanitary napkin.

German Patent Specification DE-AS 22 08 126 discloses a wrapped suction pad for hygienic purposes which contains on the side facing the wearer a layer of nitrogen particles. This nitrogen layer serves to absorb liquids and, in the swollen state, form a barrier layer for the liquids already present in a suction layer located below.

This barrier layer is necessary because the suction layer does not have sufficient retention capability.

German publication publication DE-OS 27 16 867 describes a suction-resistant product that can be used as a sanitary napkin. However, this known suction-resistant product does not ensure that the side facing the wearer remains dry during use.

German publication specification DE-OS 24 32 722 discloses a diaper on the basis of a fibrous coating and an absorbent layer of cellulosic material, the coating being treated with a binder and a wetting agent. The diaper has the disadvantage that re-withdrawal of absorbed fluid cannot be completely prevented.

The object of the present invention is to provide an improved sanitary napkin which absorbs body fluid rapidly compared to the prior art, retains this fluid even when the bandage is lightly compressed and remains dry on the side facing the wearer.

This task is solved by a sanitary napkin of the kind set out in the preamble of claim 1 and characterized in that a) said permeable cover is a hydrophobic fiber cover, which surrounds the bond externally, b) said permeable lamella is a hydrophobic fiber cover; (c) said dry fibrous wood cellulose layer comprises (i) a first layer of dry wood technical cellulose weighing between 200 g / m and 300 g / m and (ii) a second layer of dry wood cellulose and after layering, technical wood cellulose is compressed with a density of between 0.15 g / cm and 0.35 g / cm, the first layer compared to the second layer is not or only slightly compressed; (d) said layer of a product having strong retention capacity for liquids is a particle layer or foil, and that e) between the layer of a product with strong retention capacity for liquids and the impermeable laminate for body fluids is provided a hydrophilic fiber support lamella which supports said liquid retaining product . .

Said second layer of technical wood cellulose preferably has a density of between 0.20 g / cm and 0.30 g / cm 3.

Said layer of a product with strong retention capacity for liquids may consist of carboxymethyl cellulose, graft copolymers of polyacrylonitrile starch, carboxymethyl starch, cellulose modified by graft or crosslinking and acrylic copolymers. Preferably, the layer is adhered to said hydrophilic support supporting lamella.

Preferably, said impermeable lamella consists of plastic material, such as polyethylene, and is conveniently folded around the interior of the binder, both of whose length edges being adhered to the corresponding edge of the permeable cover.

Conveniently, at least one longitudinal adhesive strip is covered on the back of the sanitary napkin which is covered with a removable protective lamella.

The present sanitary napkin has, compared with the known and heretofore used sanitary napkins, a structure which allows routing and distribution of the body fluid towards the back of the napkin, so that the active side of the napkin that comes into contact with the wearer remains dry even after use. Accordingly, this binding is very convenient for the wearer. Furthermore, due to its improved absorption and retention properties for liquids, the sanitary napkin may be thinner than the usual sanitary napkins, so that even with strong fluid discharge, perfect protection is ensured.

In the case of the sanitary napkin concerned, the diffusion of the body fluid on the side facing the wearer is very weak, but strong on the side facing away from the baker. On the other hand, the known sanitary napkins are different in that the diffusion of the body fluid on the side facing the wearer is much stronger than on the opposite side.

In the binder of the invention, the body fluid to be absorbed passes first the permeable jacket which is non-wettable as it consists of hydrophobic fibers, then the permeable lamella which is also non-wettable. The interaction between these two layers prevents moisture entering the bond from penetrating again.

Then, the body fluid passes through the first layer of shredded wood cellulose. The body fluid is only slightly absorbed by this layer. This layer is not sufficiently compact to hold the body fluid and spread it over the entire surface of the layer. The body fluid then comes to the second layer of the drying cell and after layer formation compressed wood cellulose. This second layer has a large capillarity, which causes the body fluid to rapidly penetrate into this layer and is well distributed. Furthermore, this second layer absorbs the body fluid well and prevents the first layer from being wetted.

Under this second compressed layer is placed the product with high retention capacity, e.g. a film of carboxymethyl cellulose fibers. This has a high absorbency but a low absorption rate. The high absorbency of the product makes it possible to extend the use of the binder as avoiding too fast saturation of the compressed layer and the product prevents any release of body fluid even under light pressure.

The following products are mentioned as carboxymethyl celluloses which can be used as a product with high retention capacity: CLD®PERMASORB 30 ®, ALGINATE ® and AQUALON A carboxymethyl cellulose of this kind can be in the form of powder, fiber, fine crushed fibers, ie. with a length less than 1 mm, such as granules or a film of fibrous structure. This carboxymethyl cellulose fiber can swell in water and absorb up to 25 g of water per day. grams of fiber. The majority of the water thus absorbed can be effectively retained by these fibers in the carboxymethyl cellulose, even when subjected to a relatively strong compression.

As a product with strong retention capacity, a graft copolymer of polyacrylonitrile starch capable of swelling in water may also be used.

In particular, a graft copolymer of polyacrylonitrile and starch hydrolyzed with an aqueous base can be used, whereby the nitrile groups are converted into a mixture of carboxyamides and alkali metal carboxylates. After drying the copolymer in the form of a carboxylate film, this polymer is capable of absorbing several times its own weight of an electrolyte solution having a composition such as urine. Such an absorbent product can be used either in the form of films or in the form of particles.

Carboxymethyl starches which can be used as a product with high retention capacity include the product which is commercially available under the designation "SUPER-SLURPER" ®.

As cellulose fibers modified by grafting or crosslinking, and useful as a high retention product, mention may be made of celluloses grafted with polyacrylonitrile.

The invention also relates to a method of making the present sanitary napkin which is characterized in that a) as said permeable cover is used a cover of OE> hydrophilic fibers which covers the outside of the binder, b) as said permeable lamella is used. a hydrophobic fiber cover; (c) as said layer of dry, fibrous wood cellulose, a two-layer layer consisting of (i) a first layer of dry-aged, technical wood cellulose weighing between 200 g / m and 300 g / m2 is used. and (ii) a second layer of dry wood technical cellulose with a density of between 0.15 g / cm and 0.35 g / cm provided by wetting the layer of technical wood cellulose and subsequent compression so that its volume after compression is approx. 2 to 5 times less than the volume of the same layer prior to compression, and optionally drying if the humidity is more than 10%, wherein said first layer, compared to said second layer, is not or only slightly compressed; d) said layer of a product with a strong retention capacity for liquids, a particle layer or foil is used, and e) a hydrophilic fiber support laminate is provided between the layer of a strong liquid retention product and the liquid impermeable laminate which supports said liquid retention product.

The compression of the second layer of technical wood cellulose, for example, takes place with a press or a lander. It is convenient that the volume after compression be approx. 3 times less than the volume prior to compression.

During the construction of the binder, it is convenient that said first layer of technical wood cellulose, said second compressed layer of technical wood cellulose and said support laminate on which the product with strong retention capacity for liquids is adhered, be superimposed with the impermeable laminate to body fluids and then cut longitudinally. · The longitudinal cut serves to preserve the core of the napkin.

The invention is further described with reference to the drawing, in which

FIG. 1 is a perspective view of a sanitary napkin according to the invention, and

Fig. 2 schematically and on a larger scale shows a cross-section along II-II in Figs. First

Referring to FIG. 1, a sanitary napkin of substantially small thickness parallelepipedum shape is shown at 1. It has a length of approx. 23 cm, a width of approx. 7 cm and a thickness of approx. 0.5 cm.

The outside of the band consists of a cover 2 whose weight 2 is approx. 15-20 g / m, It is permeable but non-wettable as it consists of hydrophobic fibers.

Since 3a of the permeable cover 2, during use, it forms the side facing the carrier through which the body fluid penetrates. The opposite side 3b, which is not intended to come into contact with the body of the wearer, is provided with an adhesive strip 4 having a width of approx. 35 mm, and which is coated with a protective film 5 of silicone paper which can be peeled by the carrier at the time of application of the adhesive. The adhesive strip 4 is intended to secure the sanitary napkin 1 to the inner surface of the supporting garment.

Underneath the side 3a is a permeable lamella in the form of a cover 6, which also consists of hydrophobic fibers. As hydrophobic fibers which can be used for the tire 2 or the tire 6, there are mentioned the following synthetic fibers: polyesters, polypropylene, polyamides, polyacrylic compounds and polyvinyl compounds.

1 2 The tire 6 has a weight of approx. 10-20 g / m. Under the tire 6 are placed two superposed layers 7, 8 of technical wood cellulose. The first layer 7 has a weight of approx. 220 g / m and is produced by rolling up a bleached pulp obtained by baking soda.

The second layer 8 has the same composition as the first layer 7, but it differs in terms of leveling and layer formation. The layer is compressed to such an extent that the volume of the compressed layer is approx. three times less than the volume of the same layer prior to compression. The compressed layer 8 has a density of approx.

0.25 g / cm 3.

Under the second layer of compressed technical wood cellulose 8 is a layer 9 of a product with strong retention capacity. This layer is 9 cm long and 2.5 cm wide and consists of carboxymethyl cellulose fibers.

The layer 9 is adhered to a hydrophilic carrier lamina 10. The support lamella 10 ensures close contact between the layer 9 and the second layer of technical wood cellulose 8.

Claims (6)

A sanitary napkin of substantially the form of a parallelepipedum, which, having in use the side facing the wearer, sequentially has a permeable cover, a permeable lamella, a layer of dry, fibrous wood cellulose, a layer of a product having a strong retention capacity for liquids and an impermeable laminate to body fluids, characterized in that (a) said permeable liner is a hydrophobic fiber liner (2) surrounding the bonded exterior, b) said laminate laminate is a liner (6) of hydrophobic fibers, (c) said dry fibrous wood cellulose layer comprises (i) a first layer (7) of dry wood engineered wood cellulose weighing between 200 g / m and 300 g / m2, and (ii) a second layer (8) of dry-aged and, after layer forming, technical wood cellulose having a density of between 0.15 g / cm and 0.35 g / cm, the first layer (7) compared to the second layer (8) not being or only slightly compressed; (d) said layer of a strong retention product liquid capacity is a particle layer or film (9) and e) between a layer (9) of a product with a strong retention capacity for liquids and the impermeable laminate (11) for body fluids (10) of hydrophilic fibers which bracket supports said fluid retention product. 2. A sanitary napkin according to claim 1, characterized in that said impermeable lamella (11) consists of plastic material and is folded around the interior of the napkin, both of whose length edges are adhered to the corresponding edge of the permeable cover (6). A sanitary napkin according to claim 1 or 2, characterized in that said layer (9) of a product with strong retention capacity for liquids is adhered to said support lamella (10). A method of producing a sanitary napkin according to claim 1, wherein, in substantially the form of a parallelepipedum, a napkin is formed which, starting from the side facing the wearer, sequentially has a permeable cover, permeable lamella, a layer of dry, fibrous wood cellulose, a layer of a product with strong retention capacity for liquids and an impermeable lamella impermeable to body fluids, characterized in that a) as said permeable cover, a cover (2) of hydrophobic fibers is used, which (b) As said permeable laminate, a cover (6) of hydrophobic fibers is used; (c) As said layer of dry, fibrous wood cellulose, a two-ply layer consisting of (i) a first layer (7) of dry-coated, technically wood 2 cellulose having a weight of between 200 g / m and 300 g / m2, and (ii) another layer (8) of dry wood technical wood cellulose having a density of between 0.15 g / cm and 0 , 35 q / atn provided by wetting the layer of technology wood cellulose and subsequent compression so that its volume after compression is approx. 2 to 5 times less than the volume of the same layer prior to compression, and optionally drying if the humidity is more than 10%, wherein said first layer (7), compared to said second layer (8) is not or only slightly compressed, d ) as said layer of a product with strong retention capacity for liquids, a particle layer or foil (9) is used, and that e) is placed between the layer (9) of a product with a strong retention capacity for liquids and the impermeable lamella (11) for body fluids (11). a hydrophilic fiber support lamella (10) supporting said fluid retaining product. Method according to claim 4, characterized in that, as said impermeable lamella (11), a plastic lamella is folded, which is folded about the interior of the band, both of whose length edges are adhered to the corresponding edge of the permeable cover (6). Method according to claim 4 or 5, characterized in that, during the construction of the binder, said first layer (7) of technical wood cellulose, said second compressed layer (8) of technical wood cellulose and said support lamella (10), fluid retention capability is adhered, superimposed, encapsulated with the impermeable lamella (11) against body fluids, and then cut longitudinally.