RU2418569C1 - Absorbing product with improved fitting - Google Patents

Abstract

FIELD: medicine.

SUBSTANCE: invention relates to absorbing product such as protective means used in case of incontinence, diaper in form of underpants, and can be used for child, sick or disabled person care. Absorbing product has frame, which includes upper layer, lower layer and absorbing structure. Back part of frame waist includes the first elastic area. To frame in back waist area attached is a pair of opposite back lateral parts. One or both lateral parts include the second elastic area. Product also includes fastening means. Absorbing structure ends at the first distance from transversal edge of back waist area and at the second distance from the first elastic area. The first elastic area is separated from absorbing structure by the third distance and ends near the first longitudinal edge at the fourth distance. The third distance is larger and equals the second distance.

EFFECT: reduction of risk of incorrect fastening of absorbing product around user's waist and ensuring improved and comfortable fitting, attractive outlook and ability to stay in the same place in course of usual application.

29 cl, 8 tbl, 14 dwg

Description

FIELD OF TECHNOLOGY

The present invention relates to an absorbent article, such as a disposable diaper or incontinence protector, for adults or children.

BACKGROUND

Disposable diapers traditionally include a skeleton having a liquid permeable topsheet, a liquid impervious backsheet, and an absorbent structure sandwiched between the topsheet and backsheet. The frame has a front main part, which when applied passes over the abdomen and front region of the thighs of the user, and a rear main part, which when applied passes over the back and rear region of the thighs of the user. Each of the main parts has a waist part such that when fastening the diaper around the user's waist, the waist part provides a continuous environment for the user. To fasten the diaper around the user's waist, a fastening system comprising fastening tabs is usually used. Fastening tabs can be provided on the side parts that extend from the transverse side edges of the diaper frame.

As the user of the diaper moves (i.e., eats, breathes, sneezes, crawls, walks, jumps, etc.), the user's waist circumference expands and contracts, which subsequently causes parts of the diaper's waist to stretch and relax. Repeated or increased expansion and contraction of the waist can lead to long-term deformation of the waist, which leads to a weakening of the diaper around the waist. Especially for active young children wearing diapers that already contain damage, this often leads the diaper to slide down, thus increasing the risk of leakage.

To reduce the risk of leakage when worn, the diaper should provide fit to the figure in at least some areas. The fit properties of the figure also contribute to the improved appearance of the diaper when worn by the user. Typically, one or both parts of the waist may comprise an elastic waistband. In addition, the side parts on which fastening protrusions are provided may exhibit elastic properties. However, elastic material is generally more expensive than non-elastic material, and in many cases has poor air permeability.

Even though conventional diapers may exhibit some fit to the figure, nevertheless, leakage resistance is reduced if the diaper is improperly fastened around the user's waist.

When the user purchases an absorbent article, it is not possible for him / her to predict how well the absorbent article will remain in place during use, since the test methods of the prior art do not provide such information. Known test methods test only test specimens cut from the fabrics that make up the absorbent article. The disadvantage associated with testing only a test sample of fabric is that the absorbent product usually contains several different parts containing various materials that are used to fasten the absorbent product around the user's waist, such as adhesive tape, elastic sections, elastic parts and others, connected or single elements. Therefore, it is difficult to determine the elastic and tensile properties of all these parts / materials from the analysis of each part / material separately. In addition, the mass of the absorbent article and its contents are not taken into account in tests conducted on the test sample, even though the mass of the absorbent article and its contents will affect how well the absorbent article remains in place on the user.

SUMMARY OF THE INVENTION

It is an object of the present invention to provide an elasticized absorbent article, such as a disposable diaper or incontinence protector, in which the elastic regions of the absorbent article are positioned so as to reduce the risk of improperly fastening the absorbent article around the user's waist, and so that the absorbent article has an improved and comfortable fit, attractive appearance and ability to stay in place during normal use.

This problem is solved by an absorbent product containing a frame elongated around the circumference of the longitudinal axis, and the frame includes a top layer, a back layer and an absorbent structure located between the top layer and the back layer. The frame has a first transverse axis dividing the absorbent structure into a front main part ending at the front waist region, and a rear main part ending at the rear waist region, which has the first elastic region. The frame is bounded by opposite longitudinal edges and opposite transverse edges. A pair of opposite rear side parts is attached to the frame at the rear waist region of the rear main part. Each rear side part extends outward from the corresponding longitudinal edge of the frame. At least one of the rear side parts has a second elastic region. The absorbent article also comprises a fastening system, for example a mechanical fastening system, especially a hook-and-loop fastening means, for securing the absorbent product around the user's waist. The fastening system comprises a first fastening means located on a pair of opposite rear side parts, and an additional second fastening means located on the front main part.

At the back of the waist, the absorbent structure ends at a first distance from the transverse edge. The first elastic region extends substantially parallel to the transverse edge and is separated from it by a second distance and is separated from the absorbent structure by a third distance. The first elastic region ends near the first longitudinal edge at a fourth distance, where the third distance is greater than the second distance, or substantially equal to it. The first fastening system comprises a first fastening element on each opposite rear side part, the first fastening elements being arranged on a second transverse axis elongated substantially parallel to the first transverse axis, with a second transverse axis extending between the absorbent structure and the first elastic region. The synergistic effect that arises between the first and second elastic regions when using an absorbent article makes the absorbent article not only comfortable to wear and easy to fasten and handle, but also provides a satisfactory fit and ensures that the absorbent article remains firmly in place during use. even if the user is very active.

The first and second elastic regions are arranged so that they are able to elongate substantially in the transverse direction of the absorbent article, whereby the expressions “elastic” and “inelastic” as used herein are determined using the elasticity test described below.

Elasticity test

The elasticity test measures how an elastic material behaves during repeated loading and unloading cycles. The test piece is pulled to a predetermined elongation, and a cyclic movement is made between 0 and said predetermined elongation. The desired loading and unloading forces are recorded. The residual, i.e. remaining elongation of the material in a state of relaxation.

The dynamometer, Lloyd LRX, is capable of cyclic movements and is equipped with a printer / plotter or applies imaging with software. A test specimen is obtained by cutting it with 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 according to the instrument instructions. The parameters necessary for the test (load and unloading forces) are adjusted to:

Guide head speed 500 mm / min Distance between clamps 50 mm Preload 0.05 N

The test specimen is placed in the clamps according to the marks and make sure that the test specimen is centered and fixed perpendicular to the clamps. The dynamometer is turned on and three cycles are made between 0 and the indicated predetermined elongation equal to the largest defined first load. Before the last cycle, the test specimen is placed in a relaxation state for one minute, then the residual elongation is measured by drawing out the test specimen until a force of 0.1 N is noted, and the elongation is read.

An elastic material is defined as a material having a residual elongation after relaxation of less than 10% after the material has been elongated by 30% in the above elasticity test. Elongation of 30% means the ratio of elongation to length, which is 30% longer than the original length of the sample. The inelastic material has a residual elongation after relaxation of more than 10% after it has been elongated by 30%.

With regard to the fastening system of the absorbent article, the outer surface of the front part may, for example, consist of a receiving surface for the first fastening means or contain it, i.e. the backing layer of the front part can be arranged so that it functions as a receiving surface for the first fastening means, or a piece of material that is positioned so that it functions as the receiving surface for the first fastening means can be attached to the outer surface of the front part. In cases where the first fastening means is a hook fastener, non-woven material may be used as an additional second fastening means. In cases where the first fastening means is a protrusion of adhesive tape, a plastic film as well as a non-woven material may be suitable as a receiving material. Further examples of mechanical fastening systems are a button and button holes or loops, snap fasteners and the like.

A “hook-and-loop fastener” refers to a fastener system having a “hook” part (first fastening tool) and a “loop” part (additional secondary fastening tool) that are re-fastened. The term “hook”, as used herein, refers to any element capable of engaging another element, the so-called “loop” part. The term “hook” is not limited to “hooks” in the usual sense, but rather covers any form of engaging elements, either unidirectional or bidirectional. Also, the term “loop” is not limited to “loops” in the usual sense, but also covers any structure that can engage with a “hook” fastener. Examples of “loop” materials are fibrous structures like non-woven materials. Hook-and-loop fasteners are available, for example, from Velcro, USA. Alternatively, the first fastening means is an adhesive fastening means, such as an adhesive tape protrusion, in which at least a portion of the outer surface of the front part may be of a material to which the tape can be adhered (additional (complementary) secondary fastening means).

According to an embodiment of the invention, the distance of the absorbent structure from the transverse edge of the rear part (first distance) is between 40-140 mm, preferably between 80-130 mm and most preferably between 95-115 mm. The distance of the first elastic region from the transverse edge of the rear part (second distance) is between 5-40 mm and preferably between 10-30 mm. The distance of the first elastic region from the absorbent structure (third distance) is between 10-60 mm, preferably between 10-50 mm and most preferably between 15-40 mm. The distance of the first elastic region from each longitudinal edge of the rear part (fourth distance) is between 30-120 mm, preferably between 40-100 mm and most preferably between 50-90 mm.

According to an embodiment of the invention, the first and second elastic regions are sewn so that when tested on a device for testing a circular expansion of the waist, as described below, the absorbent product does not slip down more than 15 mm from its original location on the device for testing a circular expansion of the waist during at least fifteen cycles of expansion / contraction of the test for cyclic expansion of the waist and for 5-10 seconds after it was subjected to at least ten cycles of expansion / juice Testing for cyclical expansion of the waist.

According to another embodiment of the invention, the absorbent article does not slide down more than 10 mm and most preferably no more than 7 mm from its original location on the device for testing the circular expansion of the waist described in this document. A graduated scale, as determined by how much the absorbent article slides down from its original location during at least ten cycles of expansion / contraction of the cyclic waist extension test and after the test.

According to another embodiment of the invention, the first and second elastic regions are sewn so that when tested using a tensile mechanism using a force of 7 N, as described herein, the ratio of the stretching of the first elastic region to the stretching of the second elastic region is in the range of 35 : 60 to 50:60, such as, for example, 44:56.

According to another embodiment of the invention, the first elastic region ends next to each opposite longitudinal edge at a fourth distance, i.e. it is located in the center between the opposite longitudinal edges of the frame.

According to a further embodiment of the invention, the first elastic region consists of an elastic film. The elastic film may be any suitable elastic 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 / styrene (SIS), styrene / butadiene / styrene (SBS) or a block copolymer of styrene / ethylene-butadiene / styrene. Mixtures of these polymers can also be used, as well as other modifying elastomeric or non-elastomeric materials.

According to an embodiment of the invention, the second elastic region consists of an elastic laminate comprising at least one elastic layer of the film and at least one non-woven layer in which the layers are ultrasonically bonded, adhesive bonded or extruded bonded using a combination of bonding methods . For such elastic laminates, it is preferable that the first and second layers of fibrous material are selected so that they, in combination with the intermediate layer of elastic film, give the laminate a soft, clothing-like feel. Examples of suitable materials are carded webs and spun materials. Examples of suitable polymers used in fibrous materials are polyethylene, polyesters, polypropylene and other polyolefin homopolymers and copolymers. Natural fibers can also be used, for example, since they provide the desired properties. A blend of polymers can contribute to the higher flexibility of the nonwoven layer.

According to an embodiment of the invention, when the layers of the elastic laminate are ultrasonically bonded, the male side of the bonding points is positioned so that it is directed towards the body of the user of the absorbent article when using said absorbent article. The male side of said bonding points is a non-woven surface containing protrusions, such as protruding fibers, and the female side of said bonding points is a surface containing recesses.

The second elastic region may comprise a stretch activated laminate, for example, hot stretch activated, and is known in the art. An elastic laminate may be a laminate between two or more nonwoven layers, two or more film layers, or a combination of film layers and a nonwoven layer. One group of elastic laminates are the so-called “stretch-bonded” laminates, in which the elastic layer is stretched in at least one direction before laminating it with one or more inelastic layers. After the tensile force is removed from the elastic layer, it can freely contract to its unstressed state, and the inelastic layer (s) laminated with it becomes wrinkled, giving three-dimensional wrinkling. Alternatively, the second elastic region may comprise one or more elastic bands or threads joined in compression between the webs, which may be inelastic.

Another group of elastic laminates is the so-called “cross-tapered” laminates, which are laminates in which the elastic material is bonded to inelastic material, while the inelastic material is stretched under conditions that reduce its width, or “with the formation of transverse narrowing ". “Cross-tapered” laminates refer to a composite material having at least two layers in which one layer is a narrowed, inelastic layer and the other layer is an elastic layer. The layers join together when the inelastic layer is in a stretched state.

An additional group of elastic laminates is disclosed, for example, in WO 03/047488, in which non-elastic non-woven layers are laminated with an elastic film layer and the laminate is stretched above the fracture point of the non-woven materials so that the non-elastic layers break. Inelastic nonwoven layers can also be laminated with an unstretched elastic film layer. Then, the elasticity of the laminate is activated by mechanical stretching.

Examples of elastic laminates are disclosed in EP-B-0646062, WO 98/29251, WO 03/000165 and US-A-5226992. Examples of commercially available elastic laminates are Fabriflex ™ 306 from Tredegar and PK 6358 from Nordenia.

According to another embodiment of the invention, the second elastic region consists essentially of the entire at least one rear side part. However, the second elastic region can be attached by adhesive, thermal bonding, ultrasonic or laser welding to the essentially inelastic part of at least one rear side part, which leads to the application of an elastic and essentially inelastic material, according to which the length of the specified overlay, as measured in the transverse direction, can be up to 15 mm. All dimensions of the elastic regions along the transverse direction of the absorbent article, which are given in this document, refer to the active elastic length, i.e. the length of the elastic material, which can be lengthened by applying an elongating force in the transverse direction of the absorbent article and shortened when the force is removed, whereby the expression “elastic material” is as defined according to the above elasticity test.

According to an embodiment of the invention, the ratio of the distance of the first elastic region from the transverse edge of the rear main part to the distance of the absorbent structure to the transverse edge of the rear main part is 1: 2 and 1: 9, preferably 1: 3 and 1: 5, i.e. the ratio of the second distance to the first distance is 1: 2 and 1: 9, preferably 1: 3 and 1: 5.

According to another embodiment of the invention, the ratio of the third distance to the first distance is 1: 3 1: 9, preferably 1: 4 and 1:45. According to an alternative embodiment of the invention, the ratio of the fourth distance to the width of the rear main part in the rear waist region is 1:20 to 1:45, preferably 1:30 to 1: 1.40. The width of the rear main part is measured in the transverse direction of the absorbent product between the peripheral longitudinal edges of the frame to which the rear side parts are attached.

According to an embodiment of the invention, the first elastic region extends along 25-55% of the width of the rear main part in the rear waist region in the transverse direction (T) of the absorbent article, preferably along 30-45% of the width of the rear main part in the transverse direction (T) of the absorbent article, as measured in the initial non-elongated state of the rear main part.

According to another embodiment of the invention, the first elastic region extends from 1 to 5 cm in the longitudinal direction of the absorbent article, preferably 2-3 cm in the longitudinal direction of the absorbent article.

According to an embodiment of the invention, the absorbent structure in the rear main part is thinner than the absorbent structure in the front main part, namely up to 50% thinner, preferably up to 25% thinner. According to an embodiment of the invention, the absorbent structure is the thinnest in the vicinity of the rear waist region and has, for example, a thickness of 3-5 mm in proximity to the rear waist region (measured with an accuracy of ± 0.03 mm using a thickness gauge with a base, having an area of 50 cm ² and using a loading pressure of 0.5 kPa).

According to an embodiment of the invention, the absorbent article comprises a material, such as a top layer material and a breathable back layer material, which consists of at least one breathable zone located between the longitudinal edge of the carcass and the longitudinally elongated edge of the first elastic region, i.e. an edge that extends in the longitudinal direction of the absorbent article. The expression "breathable" means that the specified zone or material will allow water vapor to pass through. At least one breathable zone may, for example, contain a soft non-woven material having a thin edge, or a microporous or monolithic plastic film, which is designed to be in direct contact with the skin of the user of the absorbent product. Suitable non-woven material may be a spun material of polypropylene or polyethylene fibers. At least one breathable zone provides a traction-like effect that promotes air circulation within the absorbent article and, therefore, lowers the temperature of the inside of the absorbent article during its use as compared to a non-breathable material.

According to another embodiment of the invention, the absorbent article comprises a pair of opposed front side parts, containing, for example, non-woven material, attached to the front main part. The front side parts have a surface roughness where the vertical distance between the surface containing 5% of the material constituting the front side part and the surface containing 95% of the material constituting the front side part (SDC value 5-95%) is from 46 to 48 μm as measured using a projection method in fluorescent lighting (SPL) (as described below and schematically illustrated in FIG. 14) and using a MikroCAD optical 3D measuring device from GFMesstechnik from Göttingen, in which a sample of material is before s side parts are placed on a flat surface and covered with a glass plate, through which the measurements were made with a ratio of the scanning surface, or the surface magnification equal to 125-128%.

In the SPL method, a strip of light from a triangulation laser is deployed through a sample of material. A camera is used to determine the distance from a point along the strip from the camera, which varies depending on how far from the laser the strip hits the surface of the sample. The dot on the laser strip, the camera and the laser emitter form a triangle. The length of one side of the triangle, the distance between the camera and the laser emitter are known. The angle of rotation of the laser emitter is also known. The angle of rotation of the camera can be determined by viewing the location of the laser point in the field of view of the camera. These three pieces of information fully determine the shape and size of the triangle and provide the location of the rotation of the laser point of the triangle.

The MikroCAD optical 3D measuring device is designed for three-dimensional control of the surface profile and roughness of small samples and operates with high measuring speed and high accuracy. The non-contact measurement method provides a discrete interference display based on micromirrors. A 3D sample profile can be obtained in a few seconds.

According to a further embodiment of the invention, the first elastic region is located between the top layer and the back layer. If the first elastic region were positioned outside the top layer so that it was adjacent to the skin of the wearer when using an absorbent article, this would create more friction with respect to the wearer's skin and thereby make the absorbent article less wearable.

According to an embodiment of the invention, each of the opposing longitudinal edges comprises a foot contour, i.e. a curved shape that is positioned so as to fit around the user's leg, and that the absorbent article comprises a rubber band that extends to extend into a curved line that is substantially parallel to the foot contour when the frame is fully extended. Leg gum may contain a plurality of elastic elements, such as elastic yarns, which are pressed in compression between the top layer and the back layer of the absorbent article. The absorbent article may also be provided with so-called barrier flaps to provide improved leakage safety. These barrier lapels can in some cases replace leg elastic.

According to an embodiment of the invention, the frame comprises at least one channel free from the absorbent structure, which extends substantially in the longitudinal direction of the absorbent article in order to facilitate the absorption of the absorbent article into a bowl shape when used.

According to an embodiment of the invention, the absorbent article is for a child, i.e. an infant or young child who weighs, for example, 4-25 kg. It should be noted that the absorbent article according to an embodiment of the invention is suitable for a child having a weight of 4-25 kg, and that the absorbent article is not adjusted to fit all children in this weight range.

According to another embodiment of the invention, the absorbent article is positioned so as to be able to be fastened around the contour plates of the apparatus for testing the circular expansion of the waist, as described herein, in the manner described herein.

According to a further embodiment of the invention, the absorbent article contains elastic regions only at the rear waist region, i.e. the front waist area does not contain elastic at the waist.

It should be noted that the absorbent article according to any one of the embodiments of the invention can be worn with a front waist region located in front of the user and a rear waist region located on the back of the user. Alternatively, the absorbent article according to any one of the embodiments of the invention may be worn with a front waist region located on the back of the user and a rear waist region located on the front of the user.

BRIEF DESCRIPTION OF THE DRAWINGS

Below in this document, the present invention will be further explained by way of unlimited examples with reference to the accompanying figures, where

1 and 2 show an absorbent article according to an embodiment of the invention,

Figure 3 shows a cross section of an elastic laminate according to an embodiment of the invention,

Figure 4 shows the rear waist region according to an embodiment of the invention before testing using a tensile tester,

5 shows a back waist region according to an embodiment of the invention when tested on a tensile tester for determining length, L _7N ,

6-12 schematically show a device for testing the circular expansion of the waist according to a variant embodiment of the invention,

FIG. 13 shows the location at which a load is located in the absorbent article during a circular expansion test of the waist, and

14 schematically shows a fluorescent projection (SPL) device used to measure the surface roughness of the front side part of an absorbent article.

It should be noted that the drawings are not drawn to scale, and for the sake of clarity, the dimensions of certain parts are enlarged.

DETAILED DESCRIPTION OF EMBODIMENTS

Figures 1 and 2 show an absorbent article 10, namely a disposable diaper, which takes the form of a panty type when fastened around the user's waist. The absorbent article 10 comprises a frame 12 elongated around the circumference of the longitudinal axis, L, said frame including a top layer 13, a back layer 15 and an absorbent structure 14 placed between said top layer 13 and said back layer 15. The frame 12 has a first transverse axis, T dividing the absorbent structure 14 into a front main part 16 ending on the front waist region 18 and a rear main part 20 ending on the rear waist region 22, which has a first elastic region 24 composed, for example, of elastic a film located between the upper layer 13 and the back layer 15 of the frame 12. The first elastic region 24 can be compressed to join between the upper layer 13 and the back layer 15 or it can be compressed to the inner surface of the upper layer 13 or the inner surface of the back layer 12, in accordance with which the inner surface is a surface facing the absorbent structure 14.

The frame 12 is delimited by opposite longitudinal edges 12a and 12b and opposite transverse edges 12c and 12d. To the frame 12 on the rear waist region 22 of the rear main part 20 is attached a pair of opposite rear side parts. Each rear side part 26 extends outward from a corresponding longitudinal edge 12a, 12b of the frame 12. At least one of the rear side parts 26 has a second elastic region 28. The absorbent article 10 also includes a fastening system for securing the absorbent article 10 around the user's waist. The fastening system comprises a first fastening means 30 located on a pair of opposite rear side parts 26, and an additional second fastening means 32 located on the front main part 16.

The illustrated absorbent article 10 also includes foot circuits 34 and a foot elastic 36 that extends to extend into a curved line that is substantially parallel to the foot contour when the frame 12 is fully extended. The illustrated absorbent article 10 also comprises at least one channel 38 free from the absorbent structure, which extends substantially in the longitudinal direction L of the absorbent article 10, and a pair of opposed front side parts 40 attached to the front main part 16. In addition, the illustrated the absorbent article 10 comprises at least one breathable zone 42, which is located between the longitudinal edge 12a, 12b of the frame 12 and the longitudinal edge of the first elastic region 24.

At the rear waist region 22, the absorbent structure 14 ends at a first distance A from the transverse edge 12c. The first elastic region 24 extends substantially parallel to the transverse edge 12c and is separated from it by the second distance B and is separated from the absorbent structure 14 by the third distance C. The first elastic region 24 ends near the first longitudinal edge 12b at the fourth distance D, where the third distance C is greater than the second distance B, or essentially equal to it. In the illustrated embodiment, the first elastic region 24 ends next to each opposing longitudinal edge 12a and 12b at a fourth distance D, i.e. the first elastic region 24 is located in the center between the opposing longitudinal edges 12a and 12b of the frame 12.

The first fastening system comprises a first fastening element 30 on each opposite rear side member 26, the first fastening elements 30 being located on a second transverse axis X elongated parallel to the first transverse axis T, with a second transverse axis X extending between the absorbent structure 14 and the first elastic region 24.

The absorbent structure 14 may be of any conventional form. Examples of commonly occurring absorbent materials are fluff pulp, tissue layers, highly absorbent polymers (so-called superabsorbents), absorbent foam materials, absorbent nonwoven materials, or the like. Typically, a fluff pulp with superabsorbent polymers is combined in an absorbent structure. Superabsorbent polymers are water-swellable water-insoluble organic or inorganic materials capable of absorbing at least about 10 times their own weight in an aqueous solution containing 0.9% by weight. sodium chloride. Organic materials suitable for use as superabsorbent materials may include natural materials such as polysaccharides, polypeptides and the like, as well as 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 give the material a substantially water insoluble form. Preferred superabsorbent materials are further crosslinked so that the outer surface or shell of the superabsorbent particle, fiber, flakes, sphere, etc. had a higher crosslink density than the inside of the superabsorbent.

High fluid retention is ensured by the use of large quantities of superabsorbent material. For an absorbent structure 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 traditional for absorbent articles to have absorbent structures containing layers with different properties with respect to the ability to receive liquid, the ability to distribute the liquid, and its storage ability. Thin absorbent structures that are common, for example, in disposable diapers and incontinence protectors, often contain a compressed mixed or layered structure of the fluff pulp and superabsorbent polymers. The size and absorbency of the absorbent structure may vary to suit various applications, such as for children or adult incontinence.

The absorbent structure may further include a collection and distribution layer placed on top of the primary absorbent base, which is adapted to quickly receive and temporarily store the recovered liquid before it is absorbed by the primary absorbent structure. Such layers of collection reception and distribution are well known in the art and may consist of porous fiber packing or foam materials.

According to an embodiment of the invention, the absorbent structure 14 in the rear main part 20 is thinner than the absorbent structure in the front main part 20, namely thinner up to 50%, preferably thinner up to 25%. The absorbent structure 14 illustrated in FIG. 2 has a rounded end in the vicinity of the rear waist region 22 and is positioned to have a gradual decrease in thickness in the longitudinal direction L of the absorbent article, starting from the point at which the longitudinal axis L intersects the first transverse axis T in FIG. .2 outside the rounded end. The decreasing thickness of the rounded end of the absorbent structure 14 allows the rounded end to collect around the waist of the wearer's body and thus provides an improved fit when using the absorbent article 10 and also makes the absorbent article 10 lighter.

Figure 3 schematically shows an elastic laminate that is suitable for use as a second elastic region 28 of the rear side part 26. The elastic laminate comprises an elastic film 44 containing a styrene-butadiene copolymer sandwiched between two tapered nonwoven layers 46, such as polypropylene or polyethylene nonwoven layers, whereby the layers of said elastic laminate are bonded together by ultrasound. According to an embodiment of the invention, the at least one rear side part of the absorbent article comprises at least one similar elastic laminate. According to another embodiment of the invention, substantially the entire rear side part 26 or both rear side parts 26 are composed of such an elastic laminate.

Tensile Test Procedure

Figure 4 schematically represents the test used to determine the interaction between the first (24) and second (28) elastic regions in the absorbent article 10, as illustrated in figure 1. The rear waist region 22 of the absorbent article 10 was tested using a tensile testing mechanism (Lloyd LRX) using a force of 7 N (cell 50 N, test speed 300 mm / min, preload force 0.1 N, clamps 50 mm, line accuracy ± 0.3 mm). It is believed that several Newtons is a suitable effort when applied to a product by the user. The tests were carried out in an air-conditioned room at a temperature of 23 ± 1 ° C, a relative humidity of 50 ± 5%, whereby the samples to be tested were kept in the room for at least two hours before the tests .

First, the absorbent article 10 was cut to obtain a triangular test sample containing essentially only the rear waist region 22. The first fastening means 30 of the rear waist 22 was clamped in the upper and lower clamps 29a and 29b of the tensile tester, respectively, whereby the upper clamp 29a was arranged to move vertically and the lower clamp 29b was fixed so that it remained stationary during tests. The test sample was centered and fixed perpendicularly to the jaws 29a, 29b. The edge of each clamp 29a and 29b was placed on the outermost extreme edge of the second elastic regions 28, as shown in FIG. The length of the first elastic region 24 and the second elastic region (s) 28 in a relaxed state was measured using a ruler. After the test specimen was secured between the clamps 29a and 29b, the test specimen was extended to a preliminary force of 0.1 N. Then the upper clamp 29a was moved vertically upward at a constant speed of 300 mm / min until the tensile force equal to 7 N. The length of the first elastic region 24 and the second elastic region (s) 28 was measured using a ruler.

The following equations were used to determine the% elongation of the first and second elastic regions:

The total initial length of the first elastic region 24 and the second elastic regions 28:

where L0 is the total length of the elastic material when the rear portion 22 of the waist is in a non-elongated state,

L0 _1st is the average length of the first elastic region 24, when the rear part 22 of the waist is not elongated, and

L0 _2nd is the average length of the second elastic regions 28 when the rear part 22 of the waist is in a non-elongated state.

The total length of the first elastic region 24 and the second elastic regions 28 at 7 N:

where L _7N is the total length of the elastic material when the rear waist region 22 is subjected to a force equal to 7 N,

L _1st is the average length of the first elastic region 24 when the rear waist region 22 is subjected to a force of 7 N, and

L _2nd is the average length of the second elastic regions 28 when the rear waist region 22 is subjected to a force of 7 N.

% elongation of the first elastic region,

.% elongation of the second elastic region,

.

The tests were carried out on absorbent articles intended for infants. The top layer 13 of tested absorbent articles according to an embodiment of the invention is composed of thermally bonded spun nonwoven fabric available from BBA Nonwovens Sweden (vendor code 4 WH05-01017 N) and containing a minimum of 97% polypropylene, a maximum of 2% polyethylene, 0.3-1% TiO ₂ and a maximum of 0.6% surfactant (BHQ). The backing layer 15 is constituted by a laminated adhesive with a laminate of nonwoven fabric and a microporous film available from Nuova Pansac (vendor code Mira air 37B32). The first elastic region is constituted by an elastic film available from Nordenia (supplier code KS 6425.000), which comprises a solution cast film coextruded in three layers; the middle layer of SBS (42 microns thick) and the outer layers of polyolefin (2 × 4 microns). The elastic film had a length of 90 mm in a relaxed state before it was attached to the absorbent product, then it was extended to 140 mm and attached to the absorbent product, whereby the extreme 5 to 7 mm at each end of the elastic film did not extend , i.e. only the central part of the elastic film was elongated until the elastic film was attached to the absorbent article. The rear side parts that made up the second elastic regions are composed of an ultrasonically bonded elastic laminate available from Tredegar Film Products (vendor code Fabriflex 306) which contains a soft non-woven PP / PE material and a high-strength elastic film, whereby the non-woven side of the laminate constitutes a covered the side of the laminate worn opposite the user's skin.

The tested absorbent articles were carried out as follows: the distance of the absorbent structure from the transverse edge of the rear part (first distance) was 105 mm. The distance of the first elastic region from the transverse edge of the rear part (second distance) was 20 mm. The distance of the first elastic region from the absorbent structure (third distance) was 25 mm. The distance of the first elastic region from each longitudinal edge of the rear part (fourth distance) was 75 mm. The first elastic region 24 had an extension of 135 mm in the first transverse direction T of the absorbent article and an extension of 25 mm in the longitudinal direction L of the absorbent article.

In a relaxed state, the rear side parts 30 had a tensile strength of 55 mm in the first transverse direction T of the absorbent article and a tensile stress of 83 mm in the longitudinal direction L of the absorbent article.

It was found that the ratio of the stretching of the first elastic region to the stretching of the second elastic region of the absorbent product according to an embodiment of the invention was 44:56, while the following commercially available products had the following ratio: Huggies Super Flex 84:16, Huggies Natural Fit 83/17 and Unicharm Moneyman 53/47.

Waist Circular Test

Figure 5 shows a test sample consisting essentially of only the rear waist region 22 of an absorbent article according to an embodiment of the invention, tested on a tensile testing apparatus for determining the length, L _7N, before testing absorbent articles of the same size and type on the Test Instrument for cyclic extension of the waist. A test piece 22 is clamped between the upper and lower clamps 29a and 29b of the tensile tester as shown in FIG. 5. The edge of each clamp 29a and 29b is located on the inner extreme edge of the first fastening means 30. The test specimen 22 is extended to a preload force of 0.1 N. Then, the upper clamp 29a is moved vertically upward at a constant speed of 300 mm / min to until the tensile force is 7 N. Then measure the length, L _7N . This test procedure is similar to the test procedure used in the tensile test described above. The only difference is the location of the clamps.

6 schematically shows a perspective view of an apparatus 48 for testing the cyclic expansion of the waist according to an embodiment of the invention. Test equipment 48 includes a base 50 that supports two contour plates 52, 54, which are formed to mechanically simulate the user's human waist. The contour plates 52, 54 are supported by the base 48 so that the base 48 does not prevent any part of the absorbent article from being wrapped around the contour plates 52, 54. The absorbent article 10 is wrapped around the contour plates 52, 54, and the rear side parts 26 are attached to the outer surface of the front part 16 of the absorbent article 10 in a stretched position, as will be described below.

7 shows a device 48 for testing for cyclic expansion of the waist from above. Once the absorbent article is secured around the contour plates 52, 54, the drive means 56 pushes the second contour plate 54 away from the first mechanical element 52 from its original location X1 to an external location X2 (applying an air pressure of 4 bar) and then back to its original location X1 (which is one extension / contraction cycle) several times, so as to simulate the extension and contraction of the user's waist when he / she moves. The speed (V) of the mechanical movement of the device is set to 15 cycles in 22 s, and there is no pause between cycles.

Figures 7 and 8 show cross-sections of the device 48 for testing the cyclic expansion of the waist (as seen in the vertical plane AA shown in figure 4). The contour plates 52, 54 are shown respectively at their original location X1 and when the contour plates 52, 54 are located separately at location X2. The first fixed contour plate 52, which is inserted into the cylinder 58, is mounted directly into the base 50. The second moving contour plate 54 is inserted into the piston 56, which moves into and out of the cylinder 58 and is free to move with respect to the first fixed contour plate 52. The drive means 58, 56 may comprise a pneumatic or hydraulic cylinder or piston, as in the illustrated embodiment, or any other means for moving the two contour plates 52, 54 together and a compartment nno. Between the contour plates 52, 54, one or more support rods may be provided to support the second contour plate 54 as it moves.

9 and 10 schematically show two contour plates 52, 54 of the Device 48 for testing the cyclic expansion of the waist, respectively, side and top. The first and second contour plates 52, 54 have a substantially semicircular cross section and consist of semicircles with an outer radius of 80.2 mm, which results in a circle of 504 mm when the contour plates 52, 54 are adjacent to each other. Two contour plates are mounted with the open ends of the corresponding cross-sections of a semicircular shape facing each other so as to form a substantially circular shape resembling the shape of a person’s waist, especially the waist of a baby. The second contour plate 54 moves mechanically a predetermined distance from the internal location X1 to the external location X2. This predetermined distance is 10 mm when testing for a circular expansion of the waist, giving a circumference change of 20 mm.

Both contour plates 52, 54 have a height of 150 mm, contain austenitic stainless steel (DIN 1.4301, SIS 2333, AISI 304) having a grain size of 0.3 μm, and their surface is coated with a material based on polyethylene terephthalate, namely Scrynel Petex ^® PET59HC, which is available from Sefar AG, Mesh & Technology, 8803 Rüschlicon, Switzerland as a product of Sefar AG reference number 07-59 / 33, which has a mesh size of 59 μm, an open area of 33%, the number of cells, warp 97 cells / cm, number of cells, ducks 97 cells / cm, thread diameter, warp 44 microns, thread diameter, weft 44 microns, weight 35 g / m ² and a thickness of 65 microns. This material is glued to the contour plates using double-sided adhesive. One side of the material is covered with adhesive over its entire surface, except for a zone of width 2-3 mm along its edges (to eliminate the risk of covering the side of the material with adhesive, which will constitute the outer surface of the device for testing the circular expansion of the waist to which absorbent products will be attached), and then the material is glued to the contour plates.

When the contour plates 52, 54 are in their internal location X1, the distance between them is 5 mm. Such a distance is necessary to ensure that absorbent products do not get caught between the contour plates. If the smallest distance between the two contour plates was 0 mm, there would be a risk of sticking absorbent products in the gap between the two contour plates instead of falling out from there as soon as their elastic areas become relatively deformed.

The test for cyclic expansion of the waist includes the stages of:

• Ensure that the second contour plate 54 is installed at its internal location X1.

• Bend the absorbent article 10 and place the upper edge 12c of the front part 16 parallel to the upper edge of the first contour plate 52 and 32 cm from it, whereby the vertical location of the upper edge 12c can be noted on the first contour plate.

• Wrap the hanging gusset of the absorbent article 10 under the contour plates 52, 54 and attach the front part 10 to the rear part 20 so that the middle of the transverse edge 12d of the front part 16 of the absorbent article 10 is located between the contour plates 52, 54 of the Waist . The front and rear parts can be temporarily held in place on the contour plates using clamps. It is important to make sure that the elastic regions are extended as much as possible if they are subjected to a force of 7 N on a tensile tester, and that the elastic regions of all those present in absorbent articles to be tested are elongated by one value. This is done by determining the length L _{7N of} each absorbent article using the method described above in connection with FIG. 5, and then securing the absorbent article 10 around the contour plates 52, 54 so that it has a circumference equal to the tension distance. The tension distance, L, which is measured between the inner extreme edges of the first fastening means 30 when attached to an additional second fastening means 32 (as indicated in FIG. 12), can be calculated using the equation:

where C is the circumference of the contour plates, namely 504 mm, and L _7N is the length of the back region 22 of the waist of that absorbent article 22 when it is subjected to a force of 7 N on the tensile testing apparatus described herein.

• Place a load of 100 g (namely a brass ring having an outer diameter of 47 mm, an inner diameter of 35 mm, and a height of 13 mm) inside the crotch portion of the absorbent article. The load is placed directly in front of the center of the absorbent structure of the absorbent article on the front part of the absorbent article (as shown in FIG. 13). If clamps are used, they are then removed.

• Start the pneumatic cylinder and allow the two contour plates 52, 54 to move for fifteen expansion and contraction cycles. When the last cycle is completed, two contour plates 52, 54 are arranged to stop separately at the internal location X1 at a distance of 5 mm.

• Mark or note the location of the top edge 12c / 12a of the absorbent article thirty seconds after the fifteenth expansion and contraction cycle is completed, and measure / calculate the vertical distance between the first and second marks or locations, thus providing the distance through which the absorbent the product will slip if the absorbent product is still undergoing a test of cyclic expansion of the waist.

In order to conduct a circular waist expansion test, it is necessary to test fifteen absorbent articles of the same size and type, and the average distance through which fifteen absorbent products could slide down can be no more than 15 mm from their original location in the fifteen circular waist expansion test expansion / reduction cycles. The measurement of the distance at which each absorbent article slides was carried out 5-10 seconds after the completion of fifteen expansion / contraction cycles. The measurement is taken in the middle of the transverse edge 12d of the front part 16 of the absorbent article. The absorbent article or its packaging can then be labeled with information and / or a parameter that indicates how well the absorbent article remains in place at the user's waist during use.

12 shows an absorbent article 10 fixed around test equipment. The testing equipment may include a vertical scale 68 so that it is possible to record the initial location of the edge of the waist region 18, 22 of the absorbent article 10, as well as its location after each or all expansion and contraction cycles. Then, the drive means can move the contour plates 52, 54 in fifteen cycles of expansion and contraction, for example (when one such cycle involves moving the movable contour plate 54 from X1 to X2 and again back to X1). 12 shows the tension distance, L.

Fifteen samples of each of eight different commercially available absorbent articles (of various types and sizes) were tested under the same conditions using a circular waist extension test. Fifteen samples of the absorbent article of the present invention were also tested and compared with commercially available products. The tests were carried out in an air-conditioned room at a temperature of 23 ± 1 ° C, relative humidity 50 ± 5%, according to which the samples to be tested were kept in the room for at least two hours before the tests.

The following tables show the vertical distance of each tested absorbent article and the average vertical distance of each set of fifteen tested absorbent articles.

The √ symbol indicates that the product has passed the test, i.e. the average distance of the fifteen absorbent articles tested was not more than 15 mm from their original location on the Cyclic Waist Expansion Tester during fifteen expansion / contraction cycles and 5-10 seconds after completion of fifteen expansion and contraction cycles.

The symbol "X" indicates that the product has not passed the test, i.e. the average distance of the fifteen absorbent articles tested was more than 15 mm from their original location on the Cyclic Waist Expansion Tester during fifteen cycles of expansion and contraction, or 5-10 seconds after completion of fifteen cycles of expansion and contraction.

SCA manufactured product

product code
61205M1 264746
Tension distance
L = 135 mm product code
060929 FG092059
Tension distance L = 96 mm product code
130407 FG090659
Tension distance L = 45 mm Size 3 Size 4 Size 5 Sample Vertical distance (mm) Sample Vertical distance (mm) Sample Vertical distance (mm) one 13 one eighteen one 8 2 12 2 eleven 2 7 3 fourteen 3 16 3 8 four 12 four 8 four 7 5 12 5 12 5 7 6 eighteen 6 10 6 10 7 fifteen 7 16 7 7 8 13 8 fifteen 8 6 9 13 9 10 9 7 10 16 10 13 10 8 eleven 16 eleven eleven eleven 7 12 fourteen 12 12 12 7 13 fourteen 13 13 13 8 fourteen fourteen fourteen 10 fourteen 9 fifteen fifteen fifteen 13 fifteen 7 average 14.1
√ average 12.5
√ average 7.5
√

Active Fit manufactured by Procter & Gamble

product code
08022007 7
039 4499 74
05:52 E
Tension distance L = 134 mm product code
21092006 6
264 4,499 75
06:22 E
Tension distance
L = 111 mm product code
13102006 6,286
4499 76 21:10 E
Tension distance L = 97 mm Size 3 Size 4 Size 5 Sample Vertical distance (mm) Sample Vertical distance (mm) Sample Vertical distance (mm) one 21 one 19 one eleven 2 23 2 17 2 eleven 3 twenty 3 17 3 9 four eighteen four 16 four 9 5 23 5 eighteen 5 10 6 22 6 19 6 eighteen 7 22 7 fourteen 7 13 8 23 8 17 8 13 9 23 9 eighteen 9 13 10 eighteen 10 17 10 13 eleven eighteen eleven fourteen eleven 23 12 17 12 19 12 fourteen 13 19 13 17 13 16 fourteen twenty fourteen 17 fourteen fourteen fifteen twenty fifteen 16 fifteen 12 average 20.5
Χ average 17.0
Χ average 13.3
√

Huggies Super Flex manufactured by Kimberly Clark

Product Code BO6186111831 1
FAB: 050706
VAL: 050709
Tension distance L = 147 mm product code
BO0736122322 1 FAB:
05/02/07 VAL: 05/0210
Tension distance
L = 143 mm product code
B07030060047 1
FAB: 300107
VAL: 300 110
Tension distance L = 105 mm Size 3 Size 4 Size 5 Sample Vertical distance (mm) Sample Vertical distance (mm) Sample Vertical distance (mm) one fifteen one fifteen one 8 2 13 2 13 2 8 3 13 3 12 3 7 four fifteen four 13 four 5 5 fourteen 5 fifteen 5 6 6 12 6 eleven 6 6 7 13 7 12 7 6 8 12 8 eleven 8 5 9 16 9 13 9 7 10 fourteen 10 10 10 four eleven 12 eleven 10 eleven 9 12 17 12 eleven 12 7 13 fourteen 13 10 13 10 fourteen 13 fourteen eleven fourteen 7 fifteen fourteen fifteen 10 fifteen 9 average 13.8
√ average 11.8
√ average 6.9
√

Huggies Natural Fit manufactured by Kimberly Clark

product code
B06353080524
1 FAB 9/12/06
VAL: 19/12/09
Tension distance L = 155 mm product code
B07055080940 1
FAB24 * / 02/07
VAL24 / 02/10
Tension distance
L = 123 mm product code
BO6339080549 1
FAB: 05/12/06
VAL 05/12/09
Tension distance L = 107 mm Size 3 Size 4 Size 5 Sample Vertical distance (mm) Sample Vertical distance (mm) Sample Vertical distance (mm) one 17 one 9 one 6 2 eighteen 2 9 2 7 3 fourteen 3 9 3 7 four fifteen four 9 four 6 5 fourteen 5 8 5 6 6 fourteen 6 9 6 8 7 13 7 9 7 5 8 16 8 9 8 9 9 16 9 9 9 8 10 16 10 9 10 6 eleven 16 eleven 8 eleven 7 12 fifteen 12 9 12 8 13 17 13 8 13 6 fourteen fourteen fourteen 10 fourteen 6 fifteen fifteen fifteen 10 fifteen 7 average 13.5
Χ average 8.9
√ average 6.8
√

George manufactured by ASDA

product code
6355A2020738
MIDI
Tension distance L = 100 mm
Size 3 product code
7045A202194
5 MAXI
Tension distance L = 63 mm
Size 4 product code
7068A202161
5 MAXI PLUS
Tension distance L = 67 mm
Size 4+ product code
7062A2020211
Junior
Tension distance L = 66 mm
Size 5 Sample Vertical distance (mm) Sample Vertical distance (mm) Sample Vertical distance (mm) Sample Vertical distance (mm) one fifteen one eleven one fourteen one fourteen 2 12 2 eleven 2 12 2 eleven 3 fifteen 3 10 3 13 3 12 four eighteen four 10 four fifteen four 12 5 eighteen 5 eleven 5 fourteen 5 13 6 17 6 fourteen 6 fifteen 6 eleven 7 eighteen 7 12 7 fifteen 7 12 8 twenty 8 12 8 eleven 8 9 9 19 9 13 9 16 9 eleven 10 twenty 10 fifteen 10 13 10 eleven eleven eighteen eleven 12 eleven fourteen eleven 10 12 17 12 12 12 12 12 10 13 17 13 10 13 13 13 12 fourteen 12 fourteen fourteen fourteen fourteen fourteen 13 fifteen 16 fifteen fifteen fifteen 13 fifteen 12 average 16.8
Χ average 12.1
√ average 13.6
√ average 11.5
√

Boots manufactured by Boots

product code
709061608
Tension distance
L = 68 mm
Weight 100 g 1 909 062 008
Tension distance
L = 67 mm
Weight 100 g 1 801 072 015
Tension distance
L = 66 mm
Weight 100 g Size 4 Size 4+ Size 5 Sample Vertical distance (mm) Sample Vertical distance (mm) Sample Vertical distance (mm) one 16 one 10 one fourteen 2 fifteen 2 12 2 12 3 17 3 13 3 fourteen four 16 four fourteen four eleven 5 fifteen 5 fifteen 5 fourteen 6 16 6 eighteen 6 fourteen 7 fifteen 7 13 7 13 8 fourteen 8 12 8 13 9 fourteen 9 10 9 12 10 fifteen 10 12 10 fourteen eleven 17 eleven fifteen eleven fourteen 12 16 12 16 12 13 13 12 13 19 13 10 fourteen eighteen fourteen fifteen fourteen 16 fifteen 16 fifteen 13 fifteen eighteen average 15,5
Χ average 13.8
√ average 13.5
√

Carrefour manufactured by Carrefour

Sample Vertical distance (mm) Sample Vertical distance (mm) Sample Vertical distance (mm) Sample Vertical distance (mm) one eighteen one fifteen one 12 one fourteen 2 17 2 7 2 fourteen 2 12 3 17 3 10 3 fourteen 3 12 four 13 four 12 four 12 four fourteen 5 eighteen 5 eleven 5 13 5 13 6 fifteen 6 9 6 fourteen 6 16 7 17 7 9 7 fifteen 7 fifteen 8 eighteen 8 13 8 12 8 13 9 17 9 fifteen 9 12 9 13 10 17 10 fifteen 10 13 10 12 eleven 16 eleven 9 eleven fourteen eleven 10 12 16 12 eleven 12 12 12 13 13 eighteen 13 eleven 13 12 13 fourteen fourteen 19 fourteen 9 fourteen fourteen fourteen 13 fifteen 17 fifteen eleven fifteen 12 fifteen 13 average 16.9
Χ average 11.1
√ average 13.0
√ average 13.1
√

Monneyman manufactured by Unicharm

Product Code 852216082 (M)
Tension distance
L = 155 mm Product Code 852037093 (L)
Tension distance
L = 134 mm Size M Size L Sample Vertical distance
(mm) Sample Vertical distance
(mm) one twenty one 19 2 twenty 2 17 3 twenty 3 17 four twenty four 16 5 eighteen 5 19 6 21 6 16 7 21 7 17 8 eighteen 8 17 9 twenty 9 17 10 19 10 eighteen eleven 21 eleven 17 12 eighteen 12 17 13 twenty 13 19 fourteen eighteen fourteen 17 fifteen 19 fifteen eighteen average 19.5
Χ average 17.4
Χ

Even though some of the tested products did not slide down more than 15 mm on the Product for testing the circular expansion of the waist for 5-10 seconds after completing fifteen cycles of expansion and contraction, none of the tested products showed the same structural features as the product of the invention, namely the elastic regions of the tested products are not made in the same way as the elastic regions of the product according to the invention.

Further modifications to the invention will be apparent to those skilled in the art within the scope of the claims.

Claims (29)

1. An absorbent article (10) containing a frame (12) extending around a longitudinal axis (L), said frame comprising a top layer (13), a back layer (15) and an absorbent structure (14) placed between the top layer (13) ) and a back layer (15), where the frame (12) has a first transverse axis (T) dividing the absorbent structure (14) into the front main part (16) ending in the front waist region (18) and the rear main part (20) ) ending at the rear waist region (22), with the rear waist region (22) having a first elastic region (24) and a skeleton (12) bounded by opposite longitudinal edges (12a, 12b) and opposite transverse edges (12c, 12d); a pair of opposing rear side parts (26) attached to the frame (12) on the rear waist region (22) of the rear main part (20), and each rear side part (26) is pulled outward from the corresponding longitudinal edge (12a, 12b) of the frame ( 12), wherein at least one of the rear side parts (26) has a second elastic region (28), and a fastening system for securing the absorbent article (10) around the user's waist, the fastening system comprising the first fastening means (30), located on the specified pair of opposite backsides lateral parts (26), and an additional second fastening means (32) located on the specified front main part (16), characterized in that on the rear waist region (22) the absorbent structure (14) ends at a first distance (A) from the transverse edge (12c), and the first elastic region (24) extends substantially parallel to the transverse edge (12c) and is separated from it by a second distance (B), and is separated from the absorbent structure (14) by a third distance (C), the first elastic region (24) ends near the first longitudinal edge (12 b) a fourth distance (D) in which the third distance (C) is greater than or substantially equal to the second distance (B); wherein said first fastening system comprises a first fastening element (30) on each opposite rear side part (26), where the first fastening elements (30) are located on a second transverse axis (X) extending substantially parallel to the first transverse axis (T), c said second transverse axis (X) extending between the absorbent structure (14) and the first elastic region (24). 2. An absorbent product (10) according to claim 1, characterized in that said first and second elastic regions (24, 28) are made so that when tested on a device (48) for testing for a circular expansion of the waist, as described herein , the absorbent article (10) did not slide down more than 15 mm from its original location on the device (48) for testing the circular expansion of the waist during at least fifteen cycles of expansion / reduction of the test for cyclic expansion of the waist and within 5 -10 s after being under at least fifteen cycles of expansion / contraction test for cyclic expansion of the waist. 3. An absorbent article (10) according to claim 1 or 2, characterized in that said first and second elastic regions (24, 28) are made so that when tested on a tensile testing apparatus using a force of 7 N, described herein, the ratio of the stretching of the first elastic region (24) to the stretching of the second elastic region (28) was in the range from 35:60 to 50:60. 4. An absorbent article (10) according to claim 1 or 2, characterized in that the first elastic region (24) ends near each opposite longitudinal edge (12a, 12b) at the specified fourth distance (D). 5. An absorbent article (10) according to claim 1 or 2, characterized in that said first distance (A) is 40-140 mm, preferably 80-130 mm and most preferably 95-115 mm. 6. An absorbent article (10) according to claim 1 or 2, characterized in that said second distance (B) is 5-40 mm and preferably 10-30 mm. 7. An absorbent article (10) according to claim 1 or 2, characterized in that said third distance (C) is 10-60 mm, preferably 10-50 mm and most preferably 15-40 mm. 8. An absorbent article (10) according to claim 1 or 2, characterized in that said fourth distance (D) is 30-120 mm, preferably 40-100 mm and most preferably 50-90 mm. 9. An absorbent article (10) according to claim 1 or 2, characterized in that said first elastic region (24) is formed of an elastic film. 10. An absorbent article (10) according to claim 1 or 2, characterized in that said second elastic region (28) is an elastic laminate comprising at least one layer (44) of elastic film and at least one non-woven layer (46), in which the layers were bonded by ultrasound, adhesive or extrusion, or bonded using a combination of these bonding methods. 11. An absorbent article (10) according to claim 1 or 2, characterized in that said second elastic region (28) is an elastic laminate comprising at least one layer (44) of elastic film and at least one a nonwoven layer (46) in which the layers are ultrasonically bonded, whereby the male side of the region in which the layers are bonded is positioned so as to be directed towards the body of the user of the absorbent article (10) when using the absorbent article (10). 12. An absorbent article (10) according to claim 1 or 2, characterized in that the second elastic region (28) is represented by substantially all of said at least one rear side part (26). 13. An absorbent article (10) according to claim 1 or 2, characterized in that the ratio of said second distance (B) to said first distance (A) is between 1: 2 and 1: 9, preferably between 1: 3 and 1: 5. 14. An absorbent article (10) according to claim 1 or 2, characterized in that the ratio of said third distance (C) to said first distance (A) is between 1: 3 and 1: 9, preferably between 1: 4 and 1: 45. 15. An absorbent product (10) according to claim 1 or 2, characterized in that the ratio of the specified fourth distance (D) to the width of the rear main part (20) on the rear waist region (22) is from 1:20 to 1:45, preferably from 1:30 to 1:40. 16. An absorbent article (10) according to claim 1 or 2, characterized in that the first elastic region (24) is elongated along 25-55% of the width of the rear main part (20) in the rear waist region (22) in the transverse direction (T ) of the absorbent article (10), preferably along 30-45% of the width of the rear main part (20) in the transverse direction (T) of the absorbent article (10). 17. An absorbent article (10) according to claim 1 or 2, characterized in that the first elastic region (24) is elongated 1-5 cm in the longitudinal direction (L) of the absorbent article (10), preferably 2-3 cm in the longitudinal direction of the absorbent article (10). 18. An absorbent article (10) according to claim 1 or 2, characterized in that the absorbent structure (14) in the rear main part (20) is thinner than the specified absorbent structure (14) in the front main part (16). 19. An absorbent article (10) according to claim 1 or 2, characterized in that the absorbent structure (14) is the thinnest near the rear waist region (22). 20. An absorbent product (10) according to claim 1 or 2, characterized in that it contains a material representing at least one breathable zone, which is located between the longitudinal edge (12A, 12b) of the frame (12) and longitudinally elongated edge of the first elastic region (24). 21. An absorbent product (10) according to claim 1 or 2, characterized in that it contains a pair of opposite front side parts (40) attached to the front main part (16). 22. An absorbent article (10) according to claim 21, characterized in that SDC 5-95% of the material constituting the front side piece (40) is from 46 to 48 μm when measured using a projection method in fluorescent lighting (SPL) as described in this document. 23. An absorbent article (10) according to claim 1 or 2, characterized in that the first elastic region (24) is located between the upper layer (13) and the back layer (15). 24. An absorbent article (10) according to claim 1 or 2, characterized in that each of these opposite longitudinal edges (12a, 12b) contains a foot loop (34), and the absorbent article (10) contains a foot elastic (36), which positioned to extend into a curved line that is substantially parallel to the foot contour (34) when the carcass (12) is fully extended. 25. An absorbent article (10) according to claim 1 or 2, characterized in that the frame (12) contains at least one channel (38) free from the absorbent structure, which extends essentially in the longitudinal direction of the absorbent article (10) . 26. An absorbent product (10) according to claim 1 or 2, characterized in that it is intended for a child. 27. An absorbent product (10) according to claim 26, characterized in that it is intended for a child who weighs 4-25 kg. 28. An absorbent article (10) according to claim 1 or 2, characterized in that it is positioned so as to be fixed around the contour plates (52, 54) of the device (48) for testing the circular expansion of the waist, as described herein, by the method described in this document. 29. An absorbent product (10) according to claim 1 or 2, characterized in that it contains elastic regions (24, 28) only on the rear waist region (22).

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