RU2361559C2 - Adsorbing product in form of underpants - Google Patents

Abstract

FIELD: medicine.

SUBSTANCE: group of inventions concerns area of hygiene and can be used at incontience. An adsorbing product in the form of underpants (1), has adsorbing complete set (3) containing adsorbing core (2) and carcass (4). Carcass (4) contains forward part (5) and back part (6), in which forward and back parts (5; 6) are bridged with each other along two opposite longitudinal side edges for restriction of an aperture for a waist and pair of apertures for feet. At least, one of forward and back parts (5; 6) contains elastic rolled material (10). The product contains further gusset part (7) located between forward part (5) and back part (6) in longitudinal direction of the product, and forward part (5) has length (b1) in a longitudinal direction; back part (6) has length (b3) in a longitudinal direction and gusset part (7) has length (b2) in a longitudinal direction. Adsorbing complete set (3) lays, at least, on gusset part (7) and blocks on certain distance both forward, and back parts (5; 6). According to one embodiment adsorbing complete set (3) covers not more than 20%, preferably not more than 10% of the area of a surface of each of forward and back-parts as it is measured in the stretched condition of the product. There are two more versions of the product.

EFFECT: creation of a product with rational distribution of elastic and inelastic materials for various components and product areas.

18 cl, 5 dwg

Description

Technical field

The present invention relates to an absorbent article in the form of underpants, such as a diaper in the form of underpants, hygienic underpants or an incontinence garment, said article comprising an elastic roll material.

State of the art

It is believed that absorbent articles having certain core regions and frame regions have a snug fit on the wearer's body. For panty-shaped articles, such as panty diapers, hygiene pants or incontinence panties, it is also desirable for the articles to be able to be pulled up and pulled down the wearer's hips to allow the wearer or maintenance personnel to easily put on or remove the article after it pollution. It is known to manufacture such absorbent underpants with elastic stretchable side portions and a part of the waist, usually containing elastic elements, such as elastic threads, attached with compression between the protective layer and the upper layer.

It is further known to manufacture parts of the skeleton of absorbent articles from an elastic material, such as tensile laminates. Such laminates may include a layer of expanded elastomeric fibers that are stretched and inserted between the outer layers of the spun nets.

US 6,552,245 discloses a tensile outer coating for an absorbent article that provides a certain permanent deformation when subjected to tensile stress. The stretchable outer coating contains a neck laminate in the form of a single layer having a neck inelastic film and one layer of elastic film. Films can be breathable.

WO 03/047488 discloses an elastic laminate comprising an elastic film which, on opposite sides, binds to the first and second inelastic fibrous layers. Laminate is obtained by bonding inelastic fibrous layers with a layer of elastic film and, therefore, stretching the composite material, causing the destruction of inelastic materials. The elastic film material may be of breathable material. Laminate can be incorporated into an absorbent article.

US 2004/0243086 discloses a panty type disposable underwear having stretchable front and rear parts, for example, made of an elastic laminate. The adsorption kit is attached to the front and rear.

Other examples of adsorbent articles, which are partially made from elastic laminates, are found in US 6476289 and JP 10043235.

International applications PCT / SE2004 / 001004, PCT / SE2004 / 001005 and PCT / SE2004 / 001415 relate to absorbent articles containing an outer protective layer in the form of an elastic laminate having improved properties such as the appearance and feel of clothing.

In order to obtain a good fit, improved comfort and protection against leakage, it is important that the absorbent articles have dimensions that are combined with the corresponding dimensions of the user. Appropriate product dimensions are also important so that the components or areas of the product are not excessively large or small relative to each other. The overall dimensions of the product and the relative sizes of its components can also be adjusted so as to obtain a product with an appearance more similar to underpants. Elastic materials can be used to improve fit, but they are often expensive, so there is a need for products that are elastic in parts where elasticity is important, which may still contain (cheaper) inelastic material in parts where elasticity is less important. The right choice of elastic and inelastic materials should be made for the various components or areas of the product, thus balancing economic interests and a good fit of the product. In addition, the elastic properties of the elastic web materials used in the construction of the product should be maintained as much as possible.

There is still a need to improve the properties of absorbent articles containing an elastic web material, such as an elastic laminate, especially their fit and appearance. Convenience and softness of the absorbent products of the aforementioned type are also important. In addition, improvements in manufacturing methods can minimize production costs, which are important for disposable products, as they are discarded after a single use.

The task and the most important features of the invention

The objective of the present invention is to provide an absorbent article in the form of pants, which does not have problems associated with known products of this type. This is achieved using an absorbent article in the form of underpants (such as a diaper in the form of underpants, protective underpants or incontinence underpants), said article having an absorbent assembly comprising an absorbent core and a frame. The frame includes a front part and a rear part, which are connected to each other along two opposite longitudinal side edges to distinguish between the waist hole and a pair of leg openings. At least one of the front and rear parts comprises an elastic web material. The product further comprises a crotch portion located between the front part and the rear part in the longitudinal direction of the product. The front part has a length (b1) in the longitudinal direction, the rear part has a length (b3) in the longitudinal direction and the crotch part has a length (b2) in the longitudinal direction. The absorbent assembly lies at least on said crotch portion and overlaps both the front and rear portions at a certain distance, and the article has longitudinal (y) and transverse (x) directions.

According to one embodiment of the invention, the absorbent assembly covers no more than 20%, preferably not more than 10%, of the surface area of each of the front and rear parts, as measured in the elongated state of the product. The term “elongated state” will be described in more detail below.

Thus, the absorbent article in the form of pants provides a good fit, improved comfort and protection against leakage, since the product takes on the shape of the user's body more easily. Using a combination of parts in individual parts of the product allows for easier identification of components and the selection of those that are most suitable in the selected part.

In another embodiment of the present invention, the article has a front half delimited by the edges of the article and the transverse center line of the article, and a rear half delimited by the edges of the article and the transverse center line of the article. In accordance with the invention, the surface area of the front half is between 80% and 90% of the surface area of the rear half, as measured in the stretched state of the product.

In a further embodiment of the present invention, the article has a maximum width (c) in the transverse direction and a maximum length (b) in the longitudinal direction. According to the invention, the ratio of the maximum width (s) to the maximum length (b) of the article is between 80% and 120%, preferably between 90% and 110%, as measured in the stretched state of the article. In addition, the ratio of the length (b1) of the front to the width (s) of the article can be between 25% and 35%, preferably between 28 and 32%, as measured in the stretched state of the article. The ratio of the length (b3) of the rear to the width (s) of the article may be between 38% and 52%, as measured in the stretched state of the article.

The length (b2) of the crotch portion is between 10-40%, preferably between 20-40%, most preferably between 25-35% of the total length of the product (b), as measured in the stretched state of the product.

In one embodiment, both the front and rear parts comprise elastic web material.

In accordance with one aspect of the invention, the crotch portion is substantially free of elastic roll material, and the length of the crotch portion is substantially equal to the distance between the parts of the elastic roll material at the front and rear.

Preferably, the absorbent assembly comprises a liquid impervious protective layer, a liquid permeable top layer and an absorbent core interposed therebetween.

In one embodiment of the present invention, the crotch portion comprises a crotch material, which is preferably a substantially inelastic web material and which lies beneath the absorbent assembly on its side facing the garment. Preferably, the inelastic web material is a nonwoven fabric.

In accordance with one embodiment, the elastic web material is a laminate composed of the first and second layers of fibrous material and an elastic film layer located between said first and second fibrous layers. In another embodiment, the elastic film layer is breathable.

In one aspect of the invention, the elastic laminate has a Water Vapor Transmission Rate in accordance with at least ASTM E96-00 Method D

1,500 g / m ² 24h, preferably at least 3,000 g / m ² 24h.

In accordance with one embodiment, said elastic laminate comprises first and second fibrous layers of spun material, each having a bulk of between 10 and 35 g / m ² , preferably between 12 and 30 g / m ² , more preferably between 10 and 25 g / m ² , and an air-permeable layer of elastic film having a bulk of between 20 and 80 g / m ² , preferably between 20 and 60 g / m ² , wherein said elastic laminate has a Water vapor transmission rate in accordance with ASTM E96-00 Method D, according to at least 1500 g / m ² 24h, preferably at EPE 3000 g / m ² 24h.

According to yet another embodiment, said elastic web material has a transverse elasticity of at least 30%, preferably at least 50%, more preferably at least 70% when measured in accordance with an elasticity test, specified in this document.

In one aspect of the invention, the elastic web material has a bulk of not more than 100 g / m ² , preferably not more than 90 g / m ² .

Brief Description of the Drawings

The invention will now be described in more detail by way of example and with reference to the accompanying drawings, in which:

FIG. 1 shows a perspective view of a panty diaper.

FIG. 2 shows a top view of a panty-shaped diaper in its flat, fully stretched state before being formed, as seen from the side facing the body.

FIG. 3 is a corresponding plan view from the opposite side of the diaper in the form of panties facing the garment.

FIG. 4 is a cross section along line VI-VI of FIG. 3.

FIG. 5 is a cross-section of an elastic laminate along line VII-VII of FIG. 3.

Description of preferred embodiments

The invention will now be described in more detail with reference to some embodiments shown in the accompanying drawings.

Absorbent product

The term “absorbent article” refers to articles that are placed directly opposite the user's skin to adsorb and preserve physiological exudates, such as urine, feces and menstrual fluid. The invention mainly relates to disposable absorbent articles, which means articles that are not intended to be washed or otherwise restored or reused as an absorbent article after use. The invention relates to “panty-shaped absorbent articles” having a core region and a carcass region surrounding the core region. Examples of such absorbent articles in the form of underpants are diapers in the form of underpants, hygiene underpants and incontinence underpants.

The drawings show the embodiment of a diaper in the form of underpants 1 for children or adults with incontinence. The specified diaper in the form of pants usually contains an absorbent core 2 located in the absorbent kit 3 of the product. The diaper further comprises a frame 4. The frame contains a front part 5, a rear part 6. The product may contain an elastic belt 17.

The product has a longitudinal direction Y and a transverse direction X.

The absorbent assembly 3 comprises a liquid-permeable top layer 20 and a liquid-impermeable backing layer 19. An absorbent core 2 is sandwiched between the top layer 20 and the backing layer 19 (FIG. 4).

Upper layer

The liquid-permeable topsheet 20 may consist of a non-woven material, for example spun, expanded, carded, hydro-tangled, wet laid, etc. Suitable non-woven materials can be composed of natural fibers, such as wood pulp or cotton fibers, artificial fibers such as polyester, polyethylene, polypropylene, rayon, etc., or a mixture of natural and artificial fibers. The material of the upper layer can be further composed of tow fibers, which can be bonded to each other in a related pattern, as, for example, disclosed in EP-A-1035818. Further examples of topcoat materials are porous foams, aperture plastic films, etc. Materials suitable as topcoat materials should be soft and non-irritating to the skin and intended to be easily impregnated with physiological fluid, such as urine or menstrual fluid. The top layer may be different in different parts of the absorbent article.

Protective layer

The liquid impervious protective layer 19 contained in the absorbent assembly 3 on the garment side of the absorbent core 2 consists of a liquid impermeable material, such as a thin plastic film, for example a polyethylene or polypropylene film, a non-woven material coated with a liquid impermeable material, hydrophobic non-woven material, which prevents the penetration of liquid, or a laminate containing plastic films and non-woven materials. The protective layer 19 may be breathable so as to allow vapor to escape from the absorbent core, while still preventing liquids from passing through it. Examples of breathable backing layer materials are porous polymer films, non-woven laminates of spun and expanded layers, laminates of porous polymer films and non-woven materials. The protective layer 9 is preferably inelastic.

Elastic roll material

At least one of the front and rear parts 5 and 6 of the frame 4 contains elastic roll material 10. Preferably, both parts 5 and 6 contain elastic roll material 10. The X-direction elasticity of the elastic roll material 10 should be at least 30 %, preferably at least 50%, more preferably at least 70%, as measured by the elasticity test below.

Preferably, the elastic web material 10 is also elastic in the Y-direction of the article. However, the elasticity in the Y-direction is preferably lower than in the X-direction. Elasticity in the Y-direction should be at least 20%.

In the embodiment shown and described herein, the elastic web material is an elastic laminate 10 composed of the first and second outer layers of the fibrous material 11 and 12 and the middle layer 13 of the elastic film located between the fibrous layers (see Fig. 5). However, it is understood that other types of elastic web materials can be used, such as elastic non-woven materials, non-woven materials which are themselves inelastic but which are elasticized by elastic threads, etc. The elastic web materials may contain one layer or two or more layers that are laminated.

In the elastic laminate shown and described herein, it is preferable that the outer fibrous layers 11 and 12 be selected so that, in combination with the inner layer 13 of the elastic film, give the material high puncture resistance. They also give the laminate a soft and clothing-like feel. Examples of suitable materials are carded meshes and spun materials. The bulk of the layers of fibrous materials should be between 10 and 35 g / m ² , preferably between 12 and 30 g / m ² , more preferably between 15 and 25 g / m ² . Examples of suitable polymers used in fibrous materials are polyethylene, polyesters, polypropylene and other polyolefin homopolymers and copolymers. Natural fibers, such as cotton fiber, can also be used as long as they provide the desired properties. A mixture of polymers can contribute to higher flexibility of the nonwoven layer and thereby give the nonwoven material a higher elongation at maximum load. It has been proven that a mixture of polymers of polyethylene and polypropylene provides good results in this regard. A mixture of fibers of other polymers is also possible.

The middle layer 13 in accordance with one embodiment of the invention is an aperture elastic film having a bulk of between 20 and 80 g / m ² , preferably between 20 and 60 g / m ² . The film may be from any suitable flexible polymer, natural or synthetic. Some examples of suitable materials for an elastic film are low crystallinity polyethylene, low crystallinity polyethylene on a metallocene catalyst, ethylene vinyl acetate (EVA) copolymers, polyurethane, polyisoprene, butadiene and styrene copolymers, styrene block copolymers such as styrene, isoprene and block copolymers styrene (SIS), styrene, butadiene and styrene (SBS), and styrene, ethylene butadiene and styrene. You can also use mixtures of these polymers, as well as other modified elastomeric or non-elastomeric materials. One example of a suitable film is the aperture three-layer elastomeric film PE-SEBS-PE.

The total bulk of the laminate is preferably 100 g / m ² or less, more preferably not more than 90 g / m ² .

The elastic laminate 10 can be made in accordance with the method disclosed in WO 03/047488, in which one spun layer 11 is applied to the film 13 in an adhesive state and thereby adheres to the film layer, while the other spun layer 12 is adhesive laminated to the layer films 13 using, for example, a pressure sensitive hot melt adhesive. Alternatively, the laminate is produced in accordance with a modified version of this known method, in which the modification includes that the laminate is pulled in steps (via hooking devices, IMG) to a point below elongation at peak load of at least one of the non-elastic nonwoven layers to maintain some strength, at least for one of the nonwoven layers. Another layer can also be stretched to a point below its elongation at peak load or to a point at which it will tear during stretching.

The method disclosed in WO 03/047488 involves stretching the laminate over the fracture point of the fibrous material so that the inelastic layers are completely destroyed. Therefore, as described in WO 03/047488, the extension of the laminate is not limited to the tensile modulus of the inelastic material.

In a preferred embodiment, at least one, preferably both of the fibrous layers that bind to the elastic film (in contrast to the method described in WO 03/047488) does not completely break when a laminate is formed in accordance with the present invention. The choice of fibrous materials that have an elongation at maximum load greater than the elasticity of the elastic laminate allows the elastic film to stretch without obstruction from the side of the fibrous layers. Such a choice also ensures that the fibrous layers contribute to the resistance to puncturing of the laminate, as they do not completely delaminate or break during manufacture. Preferably, both fibrous layers or at least one of the fibrous layers have an elongation at maximum load, which is at least 10% higher than the elasticity of the laminate. This is described in more detail in PCT / SE2004 / 001005, which is incorporated herein by reference.

The opacity of the material layer is the characteristic ability of the material layer to hide visually from the side of the main object or pattern. Opacity is measured as a percentage, where 100% opacity means that nothing can be seen through the material layer, and 0% means that the material layer is completely transparent. The opacity is measured using the opacity test described below, which is based on the data of the index of reflection of light.

The opacity of the laminate can be obtained by introducing opaque fillers into the laminate, especially in an elastic film. Such pigments may be organic or inorganic dyes, coloring agents or bleaching agents. Inorganic materials such as titanium dioxide, inorganic carbonates, synthetic carbonates, talc, nypheline syenite, magnesium hydroxide, Siatomite earth aluminum trihydrate, mica, natural or synthetic silicic acids, calcined clays and mixtures thereof are examples of preferred opaque fillers.

Filler is preferably added as a masterbatch during film extrusion. One example of an approximate concentration is about 5% wt. filler to the mass of the film.

It is further preferred that the elastic laminate 10 has breathability (water vapor transmission rate) in accordance with Method D of ASTM E96-00 of at least 1500 g / m ² 24 h, preferably at least 3000 g / m ² 24 h .

The live section of the elastic film layer is preferably at least 5%, more preferably at least 8%. The live section is measured by image analysis methods and is defined as the sum of the area of the holes divided by the total area of the film sample.

Absorbent core

An “absorbent core” is an absorbent structure located in an absorbent assembly of an absorbent article. The absorbent core 2 may be of any conventional kind. Examples of commonly occurring adsorbent materials are fluff pulp, tissue layers, highly absorbent polymers (so-called superabsorbents), absorbent foam materials, absorbent nonwoven materials, or the like. It is generally accepted to combine the fluff pulp with superabsorbent polymers in an absorbent core. Superabsorbent polymers are water-swellable, water-insoluble organic or inorganic materials, capable of adsorbing at least about 20 times their own weight and in an aqueous solution containing 0.9 wt.% Sodium chloride. Organic materials suitable for use as a superabsorbent material may include natural materials such as polysaccharides, polypeptides and the like, along with synthetic materials such as synthetic hydrogel polymers. Such hydrogel polymers include, for example, alkali metal salts of polyacrylic acids, polyacrylamides, polyvinyl alcohol, polyacrylates, polyacrylamides, polyvinylpyridines and the like. Other suitable polymers include hydrolyzed starch grafted with acrylonitrile, starch grafted with acrylic acid and copolymers of isobutylene and maleic anhydride and mixtures thereof. Hydrogel polymers are preferably slightly crosslinked to convert the material to a substantially water-insoluble form. Preferred superabsorbent materials are further crosslinked so that the outer surface or shell of the superabsorbent particle, fiber, flake, sphere, etc. had a higher crosslink density than the inner part of the superabsorbent. Superabsorbent materials can be in any form suitable for use in adsorbent composites, including particles, fibers, flakes, spheres and the like.

High adsorption capacity is provided by the use of a large amount of superabsorbent material. For an absorbent core containing a matrix of hydrophilic fibers, such as cellulose fibers, and a superabsorbent material, the proportion of superabsorbent material is preferably between 10 and 90% by weight, more preferably between 30 and 70% by weight.

It is customary for absorbent articles to have absorbent cores containing layers with different properties with respect to liquid receiving ability, liquid distribution ability and its storage ability. Thin adsorbent core parts that are common, for example, in baby diapers and incontinence protectors, often contain a compressed mixed or layered structure of the fluff pulp and superabsorbent polymers. The size and adsorption capacity of the absorbent core may vary to suit various uses, such as for children or for adults with incontinence.

The absorbent core may further include a distribution and collection layer located at the top of the main absorbent core and which is adapted to quickly receive and temporarily store the recovered liquid before it is adsorbed by the main absorbent core. Such distribution and collection layers are well known in the art and may consist of porous fibrous linings or foam materials.

Diaper

The panty diaper disclosed in FIG. 1 is intended to surround the lower abdomen of the user like a pair of lower panties. It comprises an absorbent assembly 3 and a frame 4. The frame 4 comprises a front part 5 and a rear part 6. The front 5 and rear parts 6 are connected to each other along two opposite longitudinal side edges by ultrasonic welding, gluing or the like to limit the waist opening and pairs of panty diaper leg openings.

At least one and preferably both of the front and rear parts 5, 6 comprise elastic web material 10, as described above. The absorbent assembly 3 lies at least on said crotch portion 7 and overlaps at a certain distance both the front and rear parts 5, 6, and the product has a longitudinal (y) and transverse (x) direction.

The product 4 further comprises a crotch portion 7 located between the front part 5 and the rear part 6 in the longitudinal direction of the product. The front part 5 has a length b1 in the longitudinal direction, the rear part 6 has a length b3 in the longitudinal direction and the crotch part 7 has a length b2 in the longitudinal direction.

The product is thus divided into three parts (front part, gusset part and back part) in its longitudinal direction, as shown in FIG. 2. The front part is limited by the waist of the product, the longitudinal side edges of the product, part of the leg openings and the transverse line, which is located at the point at which the angle of inclination of the edge of the leg hole is the most vertical (ie, at the point at which the rate of change the angle of the edge of the leg hole with respect to the transverse direction is the highest). The back part is limited in the same way: the waist edge of the product, the longitudinal side edges of the product, the part of the product’s foot openings and the transverse line, which is located at a point on the edge of the foot opening, in which the angle of the edge is the most vertical (i.e. in which the rate of change of the angle of the edge of the leg hole with respect to the transverse direction is the highest). The gusset portion is limited at the longitudinal edges by the edges of the product leg openings and at the transverse edges by two transverse lines described above.

It is important that the elastic roll material of the front / back can bend and stretch when using the product. If inelastic materials are combined with this elastic roll material, its flexibility and extensibility are reduced. In accordance with the invention, the absorbent assembly 3 covers no more than 20%, preferably not more than 10% of the surface area of each of the front and rear parts, as measured in the stretched state of the product.

An “elongated state” is defined herein as a state in which an article is stretched in all four directions to such an extent that all elastic materials contained therein, such as elastic web material, elastic bands at the waist, elastic bands at the legs are stretched to such the extent that they will not fold any part of the product into folds, and the entire product will become completely flat. The product is stretched only to the extent that such a flat state is achieved.

In another embodiment of the invention, the product has a front half 14 defined by the edges of the product and the transverse center line 16 of the product, and a rear half 15 defined by the edges of the product and the transverse center line 16 of the product. The surface area of the front half 14 is between 80% and 90% of the surface area of the rear half 15, as measured in the stretched state of the product. This gives the absorbent article a shape more like underpants.

In a further embodiment, the article has a maximum width (s) in the transverse direction and a maximum length (b) in the longitudinal direction, and the ratio of the maximum width (c) to the maximum length (b) of the article is between 80% and 120%, preferably between 90% and 110% as measured in the stretched condition of the product. According to a preferred embodiment, the ratio of the front length (b1) to the product width (s) (b1 / s) is between 25% and 35%, preferably between 28% and 32%, as measured in the stretched state of the product. In addition, the ratio of the length (b3) of the rear to the width (s) of the product (b3 / s) is between 38% and 52%, as measured in the stretched state of the product. Products matching these sizes provide an absorbent product with a more coward-like shape and a more secure fit.

To provide a good fit and protection against leakage, the length (b2) of the crotch portion 7 should be between 10-40%, preferably between 20-40%, most preferably between 25-35% of the entire length of the product (b), as measured in the stretched state products.

The gusset portion 7 may comprise a gusset material 21 that lies beneath the absorbent assembly on its side facing the garment. In accordance with one embodiment of the invention, the gusset material 21 comprises a substantially inelastic web material 18, although elastic materials can also be used. Accordingly, the inelastic web material 18 is a nonwoven fabric. Essentially inelastic web material 18 is located on the crotch portion of the product and can be attached to the elastic web material 10 at the border between the crotch portion 7 and the front and rear parts 5 and 6, respectively, or adjacent to this border so that it is located between these parts in the longitudinal direction products. Although it can overlap the front and rear parts 5, 6 enough to join these parts, inelastic web material 18 does not significantly overlap the front and rear parts 5, 6 over most of its surface.

In one embodiment of the invention, both the front and rear parts comprise elastic web material 10, while the crotch portion 7 is substantially free of elastic web material, where the length (b2) of the crotch portion 7 is substantially equal to the distance between the parts of the elastic web material 10 on the front and rear parts 5 and 6. However, the boundary between the front and rear parts 5 and 6 and the crotch part 7 may or may not coincide with the joints between the materials of the various parts 10 and 21. Thus, the joint Between the materials of various parts can extend over any of the front, back or crotch parts.

The inelastic web material 18 of the crotch portion 7 can be attached to the elastic web material 10 of the front and / or rear parts 5, 6 while it is held in a selectively stretched state so that the front and rear seams 8, 9 of the elastic part on the inelastic web material 18 are present folds. The folds act to stretch the absorbent article in the form of underpants to the desired shape, thereby providing a good fit and also providing an article that looks more like underpants in appearance.

In another embodiment, no separate crotch material 21 is provided, but the elastic web material 10 also lies under the absorbent assembly 3 in the crotch portion of the product. Alternatively, the adsorbent assembly 3 alone connects the front and rear parts 5 and 6.

The absorbent assembly 3 in accordance with the invention comprises a liquid impervious protective layer 19, a liquid permeable top layer 20, and an absorbent core 2 enclosed by honey, all of whose components are described above. The absorbent assembly 3 can be attached to the elastic web material 10 of the front and / or rear parts 5, 6 while it is held in a selectively extended state so that folds are present in the absorbent assembly 3 at the points where it attaches to the front and rear parts 5, 6.

The panty-shaped absorbent article according to the invention may comprise an elastic belt 17 comprising elastic elements attached to the front and rear. In an alternative embodiment, only one of the front 5 and rear 6 has an elastic belt 17 attached thereto. Parts of the elastic belt 17 that are attached to the front part 5 and the rear part 6, respectively, can also be attached to each other along these side seams.

There is no need for additional elasticized side parts connecting the front and rear parts 5 and 6 when using the elastic web material 10 in accordance with the invention. If desired, additional elasticized side parts can of course be provided, especially in cases where the elastic web material 10 is located only on parts of the front and / or back parts.

As described above, the elastic web material 10 has an opacity of at least 40%, preferably at least 50%, and more preferably at least 60%. The opacity of the elastic web material provides the product with a sensation similar to clothing, which is especially important when the product is a diaper in the form of underpants. Especially in this case, when the elastic roll material forms a single component on large areas of the diaper’s surface area in the form of underpants, which are like large areas of the front and back parts, and the absorbent core covers only relatively small areas, 30% or less of the product, the feeling of elastic roll material is of great importance to the whole diaper sensation. Thus, upon receipt of an opaque elastic roll material with an opacity of at least 40%, the panty diaper will look more like clothes and more like a “normal” garment than if the elastic roll material had a higher degree of transparency . Opacity is measured by the opacity test disclosed in PCT / SE2004 / 001415.

It is further desirable that the elastic web material has a piercing resistance of at least 15H, as measured in accordance with ASTM designation D3763-02. Preferably, the elastic web material of the present invention has a piercing resistance of at least 20 N and more preferably at least 30 N.

The flexible web material should preferably have a softness in accordance with Kawabata of at least 20, preferably at least 30 and most preferably at least 40. It is further desirable that it has a formability in accordance with Kawabata no more than 50, preferably not more than 30, more preferably not more than 20, and most preferably not more than 10. It is also desirable that the elastic web material has a drape in accordance with Kawabata of not more than 40. Softness, shape spine and drapability according to Kawabata is measured according to the test methods given in PCT / SE2004 / 001004.

Elasticity test

The method measures how an elastic material behaves during repeated loading and unloading cycles. The sample is stretched to a predetermined extension, and a cyclic movement is made between 0 and the specified predetermined extension. The desired loading and unloading forces are recorded. The constant is measured, i.e. the remaining lengthening of the relaxed material.

A Lloyd LRX dynamometer is used, capable of cyclic movements and equipped with a printer / recorder, or software is used. The sample is obtained by cutting it to a width of 25 mm and a length that is preferably 20 mm longer than the distance between the clamps of the dynamometer.

The dynamometer is calibrated in accordance with the instrument instructions. The parameters required for the test (load and unload forces) are adjusted to:

slide speed: 500 mm / min

distance between clips: 50 mm

preload: 0.05 N

The sample is placed in the clamps in accordance with the marks, and you should make sure that the sample is centered and attached perpendicular to the clamps. The dynamometer is turned on and performs three cycles between 0 and a predetermined extension equal to the highest defined 1st load. Before the last cycle, the sample rests for 1 minute, then the constant elongation is measured by stretching the sample until a force of 0.1 N is reached and the elongation is read.

Permanent elongation after relaxation (attenuation) should be less than 10% and is measured by the above method. Thus, an elasticity of 30% is defined as the fact that the laminate must have permanent relaxation after elongation of less than 10% after exposure to elongation of 30% on the above dynamometer. Elongation of 30% means elongation to a length that is 30% longer than the original length of the sample.

Dimensions

Some embodiments of the products of the invention have the following dimensions and comparative dimensions:

Product Product Width (s) / Product Length (b); % Back Length (b3) /
product width (s); % Front Length (b1) /
product width (s); % Crotch length (b2) / product width (s); % Crotch length (b2) / product length (b); % one 92 47 29th 24 26 2 92 fifty 32 eighteen twenty 3 108 39 thirty 31 29th

Overlapping the adsorbent kit on the front / rear

Product % overlap, rear % overlap, rear one fifteen 5 2 12 12

It is understood that although the invention has been described with reference to preferred embodiments, some modifications are possible within the scope of the claims. Therefore, the invention is intended to cover any variations and equivalents that are in known or habitual implementations in the technical field to which it belongs.

Claims (18)

1. An absorbent article (1) in the form of underpants, such as a diaper in the form of underpants, hygiene underpants or incontinence underpants, said article having an absorbent assembly (3) comprising an absorbent core (2) and a frame (4), wherein the frame (4) 4) comprises a front part (5) and a rear part (6), in which the front and rear parts (5; 6) are connected to each other along two opposite longitudinal side edges to limit the waist opening and the pair of leg openings, at least , one of the front and rear parts (5; 6) contains an elastic roll a material (10), said product further comprising a crotch portion (7) located between the front part (5) and the rear part (6) in the longitudinal direction of the product, the front part (5) having a length (b1) in the longitudinal direction, the rear part (6) has a length (b3) in the longitudinal direction and the crotch part (7) has a length (b2) in the longitudinal direction, and the absorbent set (3) lies at least on the crotch part (7) and overlaps on a certain the distance of both the front and rear parts (5; 6), and the specified product has a longitudinal (y) and transverse direction (x), characterized in that the adsorption set (3) covers no more than 20%, preferably not more than 10% of the surface area of each of the front and rear parts, as measured in the stretched state of the product. 2. An absorbent article (1) in the form of underpants, such as a diaper in the form of underpants, hygiene underpants or incontinence underpants, said article having an absorbent assembly (3) comprising an absorbent core (2) and a frame (4), said frame (4) comprises a front part (5) and a rear part (6), in which the front and rear parts (5; 6) are connected to each other along two opposite longitudinal side edges to limit the waist opening and the pair of leg openings at least at least one of the front and back parts (5; 6) contains elas tic roll material (10), said product further comprising a crotch portion (7) located between the front part (5) and the rear part (6) in the longitudinal direction of the product, the front part (5) having a length (b1) in the longitudinal direction , the rear part (6) has a length (b3) in the longitudinal direction and the crotch part (7) has a length (b2) in the longitudinal direction, said adsorbent set (3) lying at least on the crotch part (7) and overlaps at a certain distance, both the front and rear parts (5; 6), said product having a front half (14) bounded by the edges of the product and the transverse center line (16) of the product, and a rear half (15) bounded by the edges of the product and the transverse center line (16) of the product, said product having a longitudinal ( y) and the transverse direction (x), characterized in that the surface area of the front half (14) is between 80 and 90% of the surface area of the rear half (15), as measured in the stretched state of the product. 3. An absorbent article (1) in the form of underpants, such as a diaper in the form of underpants, hygiene pants or incontinence underpants, said article having an absorbent assembly (3) comprising an absorbent core (2) and a frame (4), said frame (4) comprises a front part (5) and a rear part (6), in which the front and rear parts (5; 6) are connected to each other along two opposite longitudinal side edges to limit the waist opening and the pair of leg openings at least at least one of the front and back parts (5; 6) contains elas tic roll material (10), said product further comprising a crotch portion (7) located between the front part (5) and the rear part (6) in the longitudinal direction of the product, the front part (5) having a length (b1) in the longitudinal direction , the rear part (6) has a length (b3) in the longitudinal direction and said crotch portion (7) has a length (b2) in the longitudinal direction, wherein the absorbent assembly (3) lies at least on said crotch part (7) and overlaps at a certain distance both the front and rear parts (5; 6), and the specified product has a maximum width (s) in the transverse direction and a maximum length (b) in the longitudinal direction, and the specified product has a longitudinal (y) and transverse direction (x), characterized in that the ratio of the maximum width (s) to the maximum length (b) of the product is between 90 and 110% when measured in the stretched state of the product, while the ratio of the length of the front part (b1) to the maximum width (c) of the product is between 25 and 35%, preferably between 28 and 32% at measurement in the extended state of the product, but ix rear length (b3) to the maximum width (c) of the article is between 38 and 52% when measured in a stretched state of the article. 4. An absorbent product according to any one of claims 1 to 3, characterized in that the length (b2) of the crotch portion (7) is between 10-40%, preferably between 20-40%, most preferably between 25-35% of the total length products (b), as measured in the stretched state of the product. 5. An absorbent product according to any one of claims 1 to 3, characterized in that both the front and rear parts (5) and (6) contain the specified elastic roll material (10). 6. An absorbent article according to claim 4, characterized in that the crotch portion (7) is substantially free of elastic web material (10), and the length (b2) of the crotch portion (7) is substantially equal to the distance between the parts of the elastic web material (10) on the front and back of (5) and (6). 7. An absorbent article according to claim 5, characterized in that the crotch portion (7) is substantially free of elastic web material (10), and that the length (b2) of the crotch portion (7) is substantially equal to the distance between the elastic web parts material (10) on the front and rear parts (5) and (6). 8. An absorbent product according to any one of claims 1 to 3, characterized in that the absorbent kit (3) contains a liquid-tight protective layer (19), a liquid-permeable top layer (20) and an absorbent core (2) enclosed between them . 9. An absorbent product according to any one of claims 1 to 3, characterized in that the crotch portion (7) contains the crotch material (21) lying under the absorbent kit (3) on its side adjacent to the garment. 10. An absorbent product according to claim 9, characterized in that the material (21) of the crotch part contains a substantially inelastic web material (18). 11. An absorbent product according to claim 10, characterized in that the inelastic web material (18) is a nonwoven material. 12. An absorbent product according to any one of claims 1 to 3, characterized in that the elastic roll material is a laminate (10) composed of the first and second layers of fibrous material (11, 12) and a layer (13) of elastic film located between these the first and second fibrous layers. 13. The absorbent product according to item 12, characterized in that the layer (13) of the elastic film is breathable. 14. An absorbent product according to claim 13, characterized in that the elastic laminate (10) has a Water vapor transmission rate in accordance with Method D of ASTM E96-00 of at least 1500 g / m ^{2 for} 24 hours, preferably at least , 3000 g / m ² 24 h. 15. An absorbent product according to any one of claims 1 to 3, characterized in that the elastic laminate (10) contains the first and second fibrous layers (11, 12) of spun material, each having a bulk of between 10 and 35 g / m ² , preferably between 12 and 30 g / m ² , more preferably between 15 and 25 g / m ² , and the breathable layer (13) of the elastic film has a bulk of between 20 and 80 g / m ² , preferably between 20 and 60 g / m ² , wherein the elastic laminate (10) has a water vapor transmission rate according to ASTM E96-00 method D of at least 1500 g / m ² 24h, preferring tion of at least 3000 g / m ² 24h. 16. An absorbent product according to any one of claims 1 to 3, characterized in that the elastic web material (10) has a bulk of not more than 100 g / m ² , preferably not more than 90 g / m ² . 17. An absorbent product according to any one of claims 1 to 3, characterized in that the elastic roll material (10) has an elasticity in the transverse direction of the product of at least 30%, preferably at least 50%, more preferably 70% when measured in accordance with the test for elasticity described in the description. 18. An absorbent product according to any one of claims 1 to 3, characterized in that the elastic roll material (10) has an elasticity in the longitudinal direction of the product of at least 20% when measured in accordance with the elasticity test described in the description.

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