CN101803978B - Underpants type absorption product - Google Patents

Abstract

An absorbent article (1) of pant type having a frame (4) and an absorbent assembly (3) comprising an absorbent core (2). The frame (4) comprises a front portion (5) and a rear portion (6), wherein the front portion and the rear portion (5; 6) join each other along two opposed longitudinal sides, thereby defining a waist opening and a pair of Leg openings. At least one of the front and rear parts (5; 6) comprises an elastic web material (10). The article also comprises a crotch (7) in its longitudinal direction between a front (5) and a rear (6), the front (5) having a length (b1) in the longitudinal direction, the rear The portion (6) has a length (b3) in the longitudinal direction and said crotch portion (7) has a length (b2) in the longitudinal direction. The absorbent assembly (3) is located at least on said crotch portion (7) and overlaps both the front and the rear portion (5; 6) by a certain distance. According to one embodiment, the absorbent assembly (3) overlaps no more than 20%, preferably no more than 10%, of the respective surface areas of said front and back parts when measured on the article in the extended state.

Description

Panty type absorbent article

This application is a divisional application of Chinese Patent Application No. 200580048185.2 (application date: March 2, 2005; invention name: underwear-type absorbent product).

technical field

The present invention relates to pant-type absorbent articles, such as pant diapers, sanitary pants or incontinence garments, comprising an elastic web material.

Background technique

Absorbent articles having defined core regions and frame regions are considered to fit comfortably on the wearer. For underwear articles like pant diapers, hygiene pants and incontinence pants, it is also desirable that the article be able to be put on and taken off the wearer's buttocks, thereby allowing the wearer or caregiver to easily put the article on and get it dirty Easy to take off. It is known to provide such absorbent underpants with elasticized stretchable side and waist portions, which usually include elastic elements such as elastic threads and are contractibly secured between the backsheet and the topsheet.

It is also known to produce parts of the frame of absorbent articles from elastic materials, such as stretch bonded laminates. Such laminates may include a layer of blow-melt formed elastic fibers that have been stretched and sandwiched between outer layers of spunbond webs.

US 6,552,245 discloses an extensible outer cover for an absorbent article which provides some permanent deformation when subjected to tension. The extensible outer cover comprises a shrink laminate in the form of a shrink inelastic film and a layer of elastic film. The membrane is breathable.

WO03/047488 discloses an elastic laminate comprising an elastic film joined on opposite sides to first and second inelastic fibrous layers. Such laminates are formed by joining a layer of inelastic fibers to an elastic film layer and then stretching the composite to cause fracture of the inelastic material. The elastic film material may be a breathable material. The laminates described above may be incorporated into absorbent articles.

US 2004/0243086 discloses a disposable pant-type undergarment having extensible front and rear parts, for example made of elastic laminate. An absorbent assembly is secured to the front and back.

Other examples of absorbent articles made partly of elastic laminates can be found in US6,476,289 and JP10043235.

International applications PCT/SE2004/001004, PCT/SE2004/001005 and PCT/SE2004/001415 refer to an absorbent article comprising an outer cover in the form of an elastic laminate comprising, for example, a cloth Improved performance in general feel and appearance.

For a good fit, improved comfort, and leak safety, it is important that the absorbent article has dimensions that match the relative dimensions of the wearer. The relative size of the article is also important such that components or parts of the article cannot be oversized or undersized relative to each other. The overall size of the article and the relative sizes of its components can also be adjusted to give the article a more panty-like appearance. Elastic materials can be used to improve fit, but this is often expensive, so there is a need for elastic articles for areas where elasticity is more important, while (cheap) non-elastic materials can be included for those areas where elasticity is less important. Proper selection of elastic and inelastic materials must be made for the different components or parts of the article, thereby balancing the cost of the article with a good fit. Furthermore, the elasticity of the elastic web materials used in the construction of the article must be maintained anyway.

Accordingly, there remains a need to improve the performance of absorbent articles comprising elastic web materials such as elastic laminates, especially their fit and appearance. The comfort and soft feel of absorbent articles of the above type are also important. In addition, improvements in manufacturing methods have allowed manufacturing costs to be kept to a minimum, which is significant for disposable products since they are discarded after a single use.

Contents of the invention

It is an object of the present invention to provide an absorbent article of pant type which avoids the problems involved with known articles of this type. This can be achieved with a pant-type absorbent article, such as a pant diaper, hygiene pants or incontinence pants, having a frame and an absorbent assembly comprising an absorbent core layer. The frame includes front and rear portions joined to each other along two opposed longitudinal sides thereby defining a waist opening and a pair of leg openings. At least one of the front and rear portions includes an elastic web material. The article also includes a crotch portion between the front portion and the rear portion in its longitudinal direction. The front portion has a length (b1) in the longitudinal direction, the rear portion has a length (b3) in the longitudinal direction, and the crotch portion has a length (b2) in the longitudinal direction. Said absorbent assembly is located at least on said crotch portion and overlaps both said front and rear portions by a distance, and said article has a longitudinal direction (y) and a transverse direction (x).

According to one embodiment of the invention, said absorbent assembly overlaps said front and rear parts with no more than 20%, preferably no more than 10%, of the respective surface areas when measured on the article in an extended state. The term "extended state" will be explained more fully below.

In this way, the pant-type absorbent article can provide a good fit, greater comfort and leak-proof security because it is easier to adapt to the body shape of the wearer. By utilizing combinations between parts, especially article parts, it is possible to allow easier specification of components and make the most suitable selection for a given part.

According to another embodiment of the present invention, the aforementioned article has a front half defined by an edge of the article and a transverse centerline of the article, and a rear half defined by the edge of the article and the transverse centerline of the article. According to the invention, the surface area of said front half is 80% to 90% of the surface area of said rear half when measured on the article in an extended state.

According to yet another embodiment of the invention, the aforementioned article has a maximum width (c) in the transverse direction and a maximum length (b) in the longitudinal direction. According to the present invention, the ratio of said maximum width (c) to said maximum length (b) of the product is 80% to 120%, preferably 90% to 110%, when measured on the product in an extended state. Furthermore, the ratio of the length (b1) of said front portion to said width (c) of the product, when measured on the product in an extended state, is 25% to 35%, preferably 28% to 32%. The ratio of the length (b3) of the rear portion to the width (c) of the product is 38% to 52% when measured on the product in an extended state.

The crotch length (b2) is 10% to 40%, preferably 20% to 40%, most preferably 25% to 35% of the overall length (b) of the product when measured on the product in an extended state.

In one embodiment, both said front portion and said rear portion comprise said elastic web material.

According to one aspect of the present invention, said crotch portion is substantially free of said elastic web material, and said crotch portion has a length substantially equal to the distance between the facing layers of elastic web material in said front and rear portions.

Preferably, the absorbent assembly comprises a liquid impermeable backsheet, a liquid permeable topsheet, and an absorbent core enclosed therebetween.

According to one embodiment of the present invention, said crotch portion comprises a crotch facing material, preferably a substantially inelastic web material, positioned under the garment side absorbent assembly. Preferably, said inelastic web material is a nonwoven material.

According to one embodiment, said elastic web material is a laminate consisting of first and second layers of fibrous material, and an elastic film layer between said first and second fibrous layers. In another embodiment, said elastic film layer is breathable.

According to an aspect of the present invention, said elastic laminate has a water vapor transmission rate according to ASTM E96-00 Procedure D of at least 1500 g/m ² 24h, preferably at least 3000 g/m ² 24h.

According to one embodiment, said elastic laminate comprises first and second fibrous layers of spunbond material, and a breathable elastic film layer, said first and second fibrous layers each having 10 g/m ² to 35 g/m 2 m ² , preferably 12g/m ² to 30g/m ² , more preferably 10g/m ² to 25g/m ² , the elastic film layer has a basis weight of 20g/m ² to 80g/m ² , preferably 20g/m ² Basis weight of -60 g/m ² , said elastic laminate has a water vapor transmission rate according to ASTM E96-00 Procedure D of at least 1500 g/m ² 24h, preferably at least 3000 g/m ² 24h.

According to another embodiment, the elastic web material has an elasticity of at least 30%, preferably at least 50%, and more preferably at least 70% in the transverse direction of the product when measured according to the elasticity test method specified in this specification.

According to an aspect of the present invention, said elastic web material has a basis weight not exceeding 100 g/m ² , preferably not exceeding 90 g/m ² .

Description of drawings

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

Figure 1 shows a perspective view of a pant diaper.

Figure 2 shows a plan view of the pant diaper, shown from the body-facing side, in its flattened, fully extended state prior to forming.

Figure 3 is a corresponding plan view from the opposite garment-facing side of the pant diaper.

Fig. 4 is a section obtained along line VI-VI in Fig. 3 .

Figure 5 is a section through the elastic laminate taken along line VII-VII of Figure 3 .

Detailed ways

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

(absorbent products)

The term "absorbent article" means those articles which are arranged in contact with the skin of the wearer in order to absorb and contain bodily exudates such as urine, feces and menstrual fluid. The present invention is primarily concerned with disposable absorbent articles, which means that it is not intended that the articles be laundered or reconditioned or reused after use. The present invention relates to "absorbent articles of the pant type" having a core region and a frame region surrounding the core region. Examples of such pant-type absorbent articles are pant diapers, hygiene pants and incontinence pants.

The figures show an embodiment of a pant diaper 1 for an infant or an incontinent adult. The pant diaper generally comprises an absorbent core 2 within the absorbent assembly 3 of the article. The pant diaper also includes a frame 4 . The frame comprises a front part 5 and a rear part 6 . The article described above may also include an elastic waistband 17 .

The article described above has a longitudinal direction y and a transverse direction x.

The absorbent assembly 3 comprises a liquid permeable topsheet 20 and a liquid impermeable backsheet 19 . The absorbent core 2 is enclosed between a topsheet 20 and a backsheet 19 (Fig. 4).

(top floor)

The liquid permeable topsheet 20 may be constructed of a nonwoven material such as spunbonded, blowmelted, carded, hydroentangled, wetlaid, or the like. Suitable nonwoven materials may comprise natural fibers such as wood pulp fibers or cotton fibers, man-made fibers such as polyester, polyethylene, polypropylene, viscose, or a mixture of natural and man-made fibers. The top layer material may also comprise two fibers, which may be bonded to each other, for example in a bonding manner as disclosed in EP1035818A1. Other examples of top sheet materials are porous foams, perforated plastic films, and the like. These suitable materials for the topsheet material should be soft and non-irritating to the skin, and are expected to be readily permeable by bodily fluids such as urine or menstrual fluid. The above-mentioned topsheet may be different for different parts of the absorbent article.

(back layer)

Included in the absorbent assembly 3 on the garment side of the absorbent core 2 is a liquid-impermeable backsheet 19, which is a liquid-impermeable material, such as a thin plastic film such as polyethylene film or polypropylene film, coated with Non-woven materials impervious to liquids, hydrophobic non-woven materials impermeable to liquids, or laminates comprising plastic films and non-woven materials. The backsheet 19 may be breathable to allow vapor to escape from the absorbent core while preventing liquid from passing therethrough. Examples of breathable backsheet materials are porous polymeric films, nonwoven laminates made by spunbond and blown melt layers, laminates made by porous polymeric films and nonwovens. The back layer 9 is preferably inelastic.

(elastic web material)

At least one of the front portion 5 and the rear portion 6 of the frame 4 includes an elastic web material 10 . Preferably, both the front part 5 and the rear part 6 comprise elastic web material 10 . The elastic web material 10 should have an elasticity in the x-direction of at least 30%, preferably at least 50%, and more preferably at least 70%, as measured by the Elasticity Test Method specified herein.

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 the elasticity in the x-direction. The elasticity in the y direction should be at least 20%.

For the embodiments shown and described herein, the elastic web material is an elastic laminate 10 consisting of a first layer 11 and a second layer 12 of fibrous material, and an intermediate elastic layer between the fibrous layers. The membrane layer 13 is formed (referring to Fig. 5). However, it should be understood that other types of elastic web materials may also be used, such as elastic non-woven materials, non-woven materials that are not elastic themselves but are made elastic by elastic threads or the like. The elastic web material may comprise one layer or two or more layers laminated.

For the elastic laminate shown and described herein, the outer fibrous layers 11 and 12 are preferably chosen such that they are combined with the inner elastic film layer 13 to impart a high degree of puncture resistance to the material. They also provide a soft and cloth-like feel to the laminate. Examples of suitable materials are carded webs and spunbonded materials. The basis weight of the above fiber material layer should be 10g/m ² to 35g/m ² , preferably 12g/m ² to 30g/m ² , more preferably 15g/m ² to 25g/m ² . Examples of suitable polymers for use in the fibrous material are polyethylene, polyester, polypropylene and other polyolefin homopolymers and copolymers. Natural fibers such as cotton yarns can also be used as long as they provide the desired properties. The blend of polymers contributes to a more elastic nonwoven layer and thus gives the nonwoven material a higher stretchability at maximum load. Blends of polyethylene and polypropylene have proven to provide good results in this respect. Fiber mixtures of different polymers are also possible.

The intermediate layer 13 according to one embodiment of the present invention is a perforated elastic film layer having a basis weight of 20g/m ² -80g/m ² , preferably 20g/m ² -60g/m ² . The film layer can be any suitable natural or synthetic elastomeric polymer. Some examples of suitable materials for the elastic film layer are: low crystallinity polyethylene, metallocene catalyzed low crystallinity polyethylene, ethylene vinyl acetate copolymer (EVA), polyurethane, polyisoprene Diene, butadiene-styrene copolymers such as styrene/isoprene/styrene (SIS), styrene/butadiene/styrene (SBS) or styrene/ethylene-butadiene/benzene Styrene block copolymers of ethylene block copolymers. Mixtures of these polymers may also be used, as well as other modified elastic or non-elastomeric materials. An example of a suitable film is an apertured three-layer elastic film of PE-SEBS-PE.

The overall basis weight 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 manufactured according to the method disclosed in WO 03/047488, wherein a spunbond formed layer 11 is applied to a film 13 in a glued state and thus bonded to the film layer while simultaneously A further spunbond layer 12 is adhesively laminated to the film layer 13, for example by a pressure-sensitive hot-melt adhesive. Alternatively, the laminate can also be manufactured according to a modification of this known method, wherein the modification consists in that the laminate (via intermeshing gears, IMG) is incrementally stretched below the The extent to which at least one of the layers is elongated at peak load, thereby maintaining a certain strength for at least one of the nonwoven layers. The other layers may also be stretched below their elongation at peak load, or to an extent that tearing will occur during stretching.

The method disclosed in WO03/047488 involves stretching the laminate to such an extent that failure of the fibrous material occurs such that the inelastic layer breaks completely. Thus, elongation of the laminate is not limited by the modulus of stretch of the inelastic material as described in WO03/047488.

In a preferred embodiment, for laminates produced according to the invention, at least one of the fibrous layers, preferably both of the fibrous layers bonded to the elastic film layer, are not completely torn (as described in WO03/047488 the opposite). The fiber material is chosen to have a greater elongation at maximum load than the elasticity of the elastic laminate, which allows the elastic film to stretch without being impeded by the fibrous layers. This choice also ensures that the fiber layers contribute to the puncture resistance of the laminate since they do not completely tear or break during manufacture. Preferably, the two fiber layers or at least one of the fiber layers has an elongation at maximum load of at least 10% above the elasticity of the laminate. This is described in more detail in PCT/SE2004/001005, which is hereby incorporated by reference.

The opacity of the material layer gives the material layer a visually hidden property from the underlying object or pattern. The opacity is measured as a percentage, where 100% opacity means nothing can be seen through the material layer, and 0% means the material layer is completely transparent. The opacity is measured by the Opacity Test Method described below, which is based on luminous reflectance data.

The opacity of the laminates described above can be achieved by incorporating opacifying fillers into the laminate, especially into the elastic film. Such pigments may be organic or inorganic dyes, colorants, or brighteners. Inorganic materials such as titanium dioxide, inorganic carbonates, artificial carbonates, talc, nepheline syenite, magnesium hydroxide, aluminum trihydrate oxides, mica, natural or artificial silica, clay calcined products and mixtures thereof are preferred All examples of blackout fillers.

The aforementioned fillers are preferably added as a masterbatch onto the extrusion of the film. An example of a suitable concentration is around 5% filler by weight of the film.

Furthermore it is preferred that the elastic laminate 10 has an air permeability (water vapor transmission rate) according to ASTM E96-00 Procedure D of at least 1500 g/m ² 24h, preferably at least 3000 g/m ² 24h.

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

(absorbent core)

An "absorbent core" is an absorbent structure distributed throughout the absorbent assembly of an absorbent article. The absorbent core 2 may be of any conventional type. Examples of commonly present absorbent materials are fibrous fluff pulp, scrims, highly absorbent polymers (so-called superabsorbents), absorbent foams, absorbent nonwovens and the like. Cellulosic fluff pulp is typically combined with superabsorbent polymers in the absorbent core. A superabsorbent polymer is a water-swellable, water-insoluble, organic or inorganic material capable of absorbing at least 20 times its own weight in an aqueous solution containing 0.9 weight percent sodium chloride. Organic materials suitable for superabsorbents can include natural materials such as polysaccharides, polypeptides, etc., as well as synthetic materials such as synthetic hydrogel polymers. Such hydrogel polymers include, for example, alkali metal salts of polyacrylic acid, polyacrylamide, polyvinyl alcohol, polyacrylates, polyacrylamide, polyvinylpyridine, and the like. Other suitable polymers include hydrolyzed acrylonitrile grafted starch, acrylic acid grafted starch, and isobutylene maleic anhydride copolymers and mixtures thereof. The hydrogel polymer is preferably slightly crosslinked in order to render the material substantially water insoluble. Preferred superabsorbent materials are also surface crosslinked such that the outer surface or shell of the superabsorbent particle, fiber, flake, sphere, etc. has a higher crosslink density than its interior. The superabsorbent material can be in any form suitable for use in absorbent compositions, including particles, fibers, flakes, spheres, and the like.

A high degree of absorbency is provided by using a large amount of superabsorbent material. For absorbent cores comprising a matrix of hydrophilic fibers such as cellulosic fibers and superabsorbent material, the proportion of superabsorbent material is preferably 10% to 90% by weight, more preferably 30% to 70% by weight. %.

Absorbent articles conventionally have an absorbent core comprising multiple layers having different properties in terms of liquid acquisition, liquid distribution and storage properties. Thinner absorbent bodies commonly used in, for example, baby diapers and incontinence guard garments generally comprise a compressed blend or layered structure of fibrous fluff pulp and superabsorbent polymer. The size and absorbent capacity of the absorbent core can be varied to suit different uses such as infants or incontinent adults.

The absorbent core may also comprise an acquisition distribution layer disposed on the primary absorbent body, adapted to quickly receive and temporarily store exudates before they are absorbed by the primary absorbent core. Such acquisition distribution layers are well known in the art and may consist of porous fibrous wadding or foam.

(pant diapers)

The pant diaper shown in Figure 1 is intended to enclose the lower portion of the wearer's torso like an underwear. 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 portion 5 and the rear portion 6 are joined to each other along two opposed longitudinal sides by ultrasonic welding, gluing or the like, thereby defining a waist opening and a pair of leg openings of the pant diaper.

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

The article 4 also comprises a crotch portion 7 between the front portion 5 and the rear portion 6 in its longitudinal direction. 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.

As shown in Figure 2, the article is thus divided along its longitudinal direction into three parts (front, crotch and rear). The front portion is defined by the waist edge of the article, the longitudinal sides of the article, a portion of the leg opening of the article, and at the point where the angular change of the edge of the leg opening is most dramatic (i.e., the edge of the leg opening The transverse line where the rate of change of angle relative to the transverse direction is greatest). The rear portion is defined in a similar manner by: the waist edge of the article, the longitudinal sides of the article, a portion of the leg opening of the article, and at the point where the angular change of the edge of the leg opening is most dramatic (i.e. the leg The transverse line where the angle of the edge of the opening changes the most with respect to the transverse direction). Said crotch is bounded on the longitudinal edges by the edges of the leg openings of the article and on the transverse edges by the two transverse lines mentioned above.

It is important that the front/rear elastic web material is allowed to bend and stretch when the article is in use. If an inelastic layer is joined to the elastic web material, its elasticity and extensibility will be reduced. According to the invention, the overlapping of the respective surface areas of said front and rear parts by the absorbent assembly 3 does not exceed 20%, preferably does not exceed 10%, when measured on the article in the extended state.

The "extended state" of an article is defined herein as an article that has been extended in all four directions to the extent that all elastic materials contained therein (e.g., elastic web material, waist elastic, leg elastic) to the extent that they do not wrinkle any part of the article and the article is completely flat throughout. The article stretches only so far as to achieve a flat state.

According to another embodiment of the invention, the article has a front half 14 defined by the article edge and article transverse centerline 16, and a rear half 15 defined by the article edge and article transverse centerline 16. The surface area of the front half 14 is 80% to 90% of the surface area of the rear half 15 when measured on the article in the extended state. This provides a more pant-like absorbent article.

In another embodiment, the article has a maximum width (c) in the transverse direction and a maximum length (b) in the longitudinal direction, when the article is measured in an extended state, the maximum width (c) of the article is the same as the maximum The ratio of the length (b) is 80% to 120%, preferably 90% to 110%. According to a preferred embodiment, the ratio (b1/c) of the length (b1) of the front part to the width (c) of the product is 25% to 35%, preferably 28% to 32%, when the product is measured in an extended state. %. Furthermore, when the product in the stretched state was measured, the ratio (b3/c) of the length (b3) of the rear portion to the width (c) of the product was 38% to 52%. Articles conforming to these dimensions can provide a more pant-looking absorbent article and a more secure fit.

In order to provide good matching and leak-proof safety, when the product is measured in the extended state, the length (b2) of the crotch 7 is 10% to 40%, preferably 20% to 40% of the overall length (b) of the product , most preferably 25% to 35%.

The crotch portion 7 may comprise a crotch facing material 21 which is positioned under the garment side absorbent assembly. According to one embodiment of the present invention, the crotch facing material 21 comprises a substantially inelastic web material 18, although elastic materials may also be used. Suitably, the inelastic web material 18 is a nonwoven material. Substantially inelastic web material 18 is disposed on the crotch portion of the article and may be joined to elastic web material 10 at or near the border of the crotch portion 7 with the front portion 5 and rear portion 6, respectively, so that it follows the The longitudinal direction of the article lies between these parts. While the inelastic web material 18 may overlap the front portion 5 and the rear portion 6 sufficiently to be connected thereto, it does not substantially overlap the front portion 5 or the rear portion 6 over most of its surface.

According to one embodiment of the invention, said front and rear portions are comprised of elastic web material 10, while the crotch portion 7 is substantially free of said elastic web material, wherein the length (b2) of the crotch portion 7 is substantially equal to that of the front portion 5 and the distance between the facing layer of elastic web material 10 in the rear portion 6 . However, the boundary line between the front and rear parts 5, 6 and the crotch part 7 may or may not coincide with the seam between the different facing materials 10 and 21 . In this way the seam between the different facing materials may extend across any of the front, back or crotch.

The inelastic web material 18 of the crotch portion 7 can be connected to the elastic web material 10 of the front portion 5 and/or the rear portion 6 and maintained in a selected stretched state so that the inelastic web material of the front and rear crotch seams 8,9 There will be no wrinkles in the mesh material 18 . The creases act to pull the pant-type absorbent article into the desired shape, thereby providing a good fit and giving the article a more pant-like appearance.

In another embodiment, no separate crotch facing material 21 is provided, but the elastic web material 10 remains under the absorbent assembly 3 in the crotch of the article. Alternatively, the absorbent assembly 3 alone connects the front part 5 and the rear part 6 .

The absorbent assembly 3 according to the invention comprises a liquid-impermeable backsheet 19, a liquid-permeable topsheet 20, and an absorbent core 2 enclosed therebetween, all of which components are as described above. The absorbent assembly 3 may be attached to the elastic web material 10 of the front portion 5 and/or the rear portion 6 and held in a selected stretched state so that the absorbent assembly 3 exists at the position where it is attached to the front portion 5 and the rear portion 6 wrinkled.

The pant-type absorbent article according to the present invention may comprise an elastic waistband 17 comprising elastic elements secured to said front and back portions. In an alternative embodiment, only one of the front part 5 and the rear part 6 has an elastic waistband 17 secured thereto. The elastic waistband portions 17 fastened to the front part 5 and the rear part 6 respectively may also be connected to each other along said side seams.

When using the elastic web material 10 according to the invention, additional elastic side portions connecting the front portion 5 and the rear portion 6 are no longer required. Additional elastic sides can of course also be provided if desired, especially if the elastic web material 10 is only arranged in a part of the front and/or rear.

As noted above, the elastic web material 10 has an opacity of at least 40%, preferably at least 50%, more preferably at least 60%. The opacity of the elastic web material can provide a cloth-like appearance to the article, which is especially important if the article is a pant diaper. Especially for elastic web materials that form the sole element over a relatively large surface area of the pant diaper (such as the large areas of the front and rear), while the absorbent core only covers a relatively small area (30% or less) of the product. ), the appearance of the elastic web material is quite important to the overall appearance of the article. Thus, by having an elastic web material with an opacity of at least 40%, the pant diaper exhibits a more clothy feel and is closer to a "standard" pant than if the elastic web material is more transparent. Opacity is measured according to the Opacity Test Method disclosed in PCT/SE2004/001415.

It is also desirable that the elastic web material possess a puncture resistance of at least 15 N as measured according to ASTM Designation D3763-02. The elastic web material according to the invention preferably has a puncture resistance of at least 20N, more preferably of at least 30N.

The elastic web material should preferably have a softness of at least 20, preferably at least 30, more preferably at least 40 according to Kawabata. It is also desirable that it possess a formability according to Kawabata of not more than 50, preferably not more than 30, more preferably not more than 20, most preferably not more than 10. It is also desirable that the elastic web material has a drapability of not more than 40 according to Kawabata. The above flexibility, formability and drapability according to Kawabata were measured by the test method given in PCT/SE2004/001004.

(elasticity test)

This method tests how elastic materials behave under repeated load and no-load cycles. The sample is stretched to a predetermined extension and a cyclic movement is performed between 0 and said predetermined extension. The desired loaded and unloaded strengths are recorded. The permanent elongation of the relaxed material, ie the residual elongation, is measured.

A tensile testing machine Lioyd LRX capable of performing cyclic movements and equipped with a printer/plotter or imaging software was used. The samples are prepared as follows: they are cut to a width of 25 mm and a length preferably 20 mm longer than the spacing of the grips in the tensile testing machine.

The tensile testing machine was calibrated according to the equipment instructions. The parameters required for the test (loaded and unloaded strength) were adjusted to:

Crosshead speed: 500mm/min

Fixture spacing: 50mm

Preload: 0.05N

Place the sample in the fixture according to the marks, and make sure that the sample is centered and fixed vertically in the fixture. The tensile testing machine is activated and performs three cycles between 0 and a predetermined extension equal to the highest defined first load. Before the last cycle, the sample was relaxed for 1 min, the permanent elongation was measured by stretching the sample until a force of 0.1 N was detected, and the elongation was read.

The permanent elongation after relaxation should be less than 10% and measured as above. Thus, 30% elasticity is defined as the laminate should have a post-extension permanent relaxation of less than 10% after being subjected to a 30% extension in the tensile tester described above. An extension of 30% means that the length is extended by 30% greater than the original length of the sample.

(size)

Some embodiments of articles of the invention have the following dimensions and relative dimensions:

Product Product Width (c)/Product Rear Length (b3)/ Front Length (b1)/ Crotch Length (b2)/ Crotch Length (b2)/

Product length (b); % Product width (c); % Product width (c); % Product width (c); % Product length (b); %

1 92 47 29 24 26

2 92 50 32 18 20

3 108 39 30 31 29

Overlap of absorbent components on front/rear

Article Overlap %, Posterior Overlap %, Posterior

1 15 5

2 12 12

It will be understood that although the invention has been described with reference to a preferred embodiment, several modifications may be made within the scope of the claims. The present invention is therefore intended to cover any modifications or equivalents that come within known or conventional technical means in the art.

Claims (19)

CLAIMS 1. A pant-type absorbent article (1) having a frame (4) comprising a front (5) and a rear portion and an absorbent assembly (3) comprising an absorbent core (2) (6) wherein said front and rear portions (5; 6) join each other along two opposed longitudinal sides thereby defining a waist opening and a pair of leg openings, said front and rear At least one of (5; 6) comprises an elastic web material (10), said article (4) further comprising a crotch portion (7) in its longitudinal direction between the front portion (5) and the rear portion (6) , the front portion (5) has a length (b1) in the longitudinal direction, the rear portion (6) has a length (b3) in the longitudinal direction, and the crotch portion (7) has a length (b3) in the longitudinal direction ( b2), said absorbent assembly (3) is located at least in said crotch portion (7) and overlaps both said front and rear portions (5; 6) by a certain distance, said article has a maximum width in transverse direction (c) and having a maximum length (b) in the longitudinal direction, said article having a longitudinal direction (v) and a transverse direction (x), It is characterized in that, the absorbent assembly does not overlap by more than 20% of the respective surface areas of said front and rear parts when measured on the article in the extended state, When measuring the product in an extended state, the ratio of said maximum width (c) to said maximum length (b) of the product is 90% to 110%, the ratio of the length (b1) of said front portion to said maximum width (c) of the article is 25% to 35%, when measured on the article in an extended state, The ratio of the length (b3) of the back portion to the maximum width (c) of the product is 38% to 52%, when measured on the product in an extended state. 2. The pant-type absorbent article (1) according to claim 1, wherein said pant-type absorbent article is a pant diaper, a sanitary pant or an incontinence pant. 3. The pant-type absorbent article (1) according to claim 1, wherein the ratio of the length (bl) of said front portion to said maximum width (c) of the article is 28% to 32%. 4. The pant-type absorbent article (1) according to claim 1, characterized in that, When measuring the product in an extended state, the length (b2) of the crotch portion (7) is 10% to 40% of the overall length (b) of the product. 5. The underpants type absorbent product (1) according to claim 1, characterized in that the length (b2) of the crotch portion (7) is 20%-40% of the overall length (b) of the product. 6. The pant-type absorbent product (1) according to claim 1, characterized in that the length (b2) of the crotch portion (7) is 25%-35% of the overall length (b) of the product. 7. The pant-type absorbent article (1) according to claim 1 or 2, characterized in that, Both said front part (5) and said rear part (6) comprise said elastic web material (10). 8. The pant-type absorbent article (1) according to claim 1, characterized in that, The crotch (7) is substantially free of the elastic web material (10), and the length (b2) of the crotch (7) is substantially equal to the elasticity in the front (5) and rear (6) The distance between the facing layers of the web material (10). 9. The pant-type absorbent article of claim 1, wherein: The absorbent assembly (3) comprises a liquid-impermeable backsheet (19), a liquid-permeable topsheet (20), and an absorbent core (2) enclosed therebetween. 10. The pant-type absorbent article of claim 1, wherein: The crotch portion (7) comprises a crotch facing material (21) which is positioned under the absorbent assembly (3) on the garment side. 11. The pant-type absorbent article of claim 10, wherein: The crotch facing material (21) comprises a substantially inelastic web material (18). 12. The pant-type absorbent article of claim 11, wherein: The substantially inelastic web material (18) is a nonwoven material. 13. The pant-type absorbent article of claim 1, wherein: The elastic web material is a laminate (10) consisting of first and second layers (11, 12) of fibrous material, and an elastic film layer (13) between said first and second fibrous layers ) constitutes. 14. The pant-type absorbent article of claim 13, wherein: The elastic film layer (13) is breathable. 15. The pant-type absorbent article of claim 14, wherein: The elastic laminate (10) has a water vapor transmission rate according to ASTM E96-00 Procedure D of at least 1500 g/m ² 24h. 16. The pant-type absorbent article of claim 13, wherein: The elastic laminate (10) comprises first and second fibrous layers (11, 12) made of spunbond material, and a breathable elastic film layer (13), the first and second fibrous layers Each has a basis weight of 10g/m ² to 35g/m ² , the breathable elastic film layer (13) has a basis weight of 20g/m ² to 80g/m ² , and the elastic laminate (10) has Water vapor transmission rate of at least 1500g/m ² 24h according to ASTM E96-00Procedure D. 17. The pant-type absorbent article of claim 1, wherein: The elastic web material (10) has a basis weight of not more than 100 g/ ^m2 . 18. The pant-type absorbent article of claim 1, wherein: The elastic web material (10) has an elasticity of at least 30% in the transverse direction of the product when measured according to the elasticity test method specified in this specification. 19. The pant-type absorbent article of claim 1, wherein: The elastic web material (10) has an elasticity of at least 20% in the longitudinal direction of the product when measured according to the elasticity test method specified in this specification.