DE202014011114U1 - Series of absorbent articles with channel-forming regions - Google Patents

Abstract

A series of at least two absorbent articles of different sizes, the articles comprising a wearer facing side, a garment facing side and an absorbent core (28) comprising an absorbent material (60) between the wearer facing side and the garment facing side, wherein each absorbent article has a notional longitudinal axis (80), a front portion (36), a rear portion (38), and an intermediate crotch portion (37), each portion having one third of the length of the article as measured along the longitudinal axis wherein the absorbent core forms two channel forming regions (26) at least partially present in the crotch region of the article, said channel forming regions being symmetrically disposed on opposite sides of the longitudinal axis and concave to the longitudinal axis, each channel forming region having a length (KL) and has a height (KH), characterized in that s I increased the length to height ratio (KL / KH) of the channel forming areas with the size of the articles.

Description

FIELD OF THE INVENTION

The invention relates to absorbent personal hygiene articles of the type used by an incontinent person for receiving body exudates, in particular urine. The articles include in particular baby and toddler nappies (including diaper panties), sanitary napkins and adult incontinence articles.

BACKGROUND OF THE INVENTION

These personal care absorbent articles typically comprise an absorbent material disposed between a liquid-pervious skin-contacting ply (topsheet) and a liquid-impermeable garment-facing ply (backsheet). Superabsorbent polymer materials ("SAP") capable of absorbing many times their own weight of urine are typically used today as absorbent material. SAP particles are typically mixed with cellulosic fluff, however, commercially newer cellulose-free absorbent cores (so-called "Airfelt Free" absorbent core) are now marketed. The absorbent material may typically be included in a separate component called absorbent core, but it may also simply be located directly between the topsheet and the backsheet.

Personal hygiene absorbent articles are typically offered in a variety of sizes to suit the particular needs of the various individuals wearing them. For example, baby diapers are typically differentiated according to the weight of the child they are wearing, each diaper size corresponding to the baby's weight range. The size of each article increases according to the weight range. The number of sizes and weight ranges may vary from manufacturer to manufacturer and market to market. Similar subdivision exists in other categories of personal hygiene articles, such as feminine care and adult incontinence articles, and may be related to the severity of the incontinence as well as the size of the person wearing the article.

Typically, the dimensions of the absorbent core and the amount of absorbent material will increase with the size of the articles, particularly to accommodate a greater amount of urine, at least as long as the one wearing the article remains incontinent. Articles for older children in the exercise phase (eg, exercise pants) that are about to become dry may have less absorbent material than products for younger children. However, the overall design and dimensions of the absorbent core generally do not vary with product sizes.

Recently, it has been proposed to provide absorbent structures comprising superabsorbent polymers, optionally a cellulosic material, and at least two substantially longitudinally extending absorbent material-free zones forming channels. Examples of such structures are in WO2012 / 170778 (Rosati et al., See also WO2012 / 170779 . WO2012 / 170781 and WO2012 / 170808 ) and further in the WO2014 / 093319 , WO2014 / 093311 (both to Arizti), WO2014 / 093310 (Ehrnsperger) revealed. The material free zone in these disclosures may be domed. Another prior art discloses channels that are straight and are typically aligned in the longitudinal and / or transverse direction of the core, as in US-A-5,423,741 WO95 / 11652 (Dancer) or WO2012 / 052,172A1 (Van Malderen).

The WO2008 / 023291 (Cohen) discloses that children at different stages of development have different predominant leg positions. Cohen cites the different predominant leg positions of newborns, babies, and toddlers by providing a range of disposable items that include different leg opening positions. However, Cohen does not disclose adapting the structure of the absorbent cores according to the stage of development of the person wearing them.

There is a continuing need for the improvement and comfort of absorbent articles. The provision of absorbent articles of different dimensions (longitudinal and transverse) based on baby weight is known to provide proper coverage and performance. The inventors of the present application have now found that the dimensions of the channeling area should be particularly adapted to the size of the person wearing the article. The adaptation of the dimensions and in particular the ratio of the curvature of the channel-forming regions to the morphological changes of the baby (height, weight and leg circumference) is advantageous in order to allow a good fit over the entire time course of the diaper age. In addition, the inventors have one Relationship between the dimensions of the channels and the morphology parameters of the baby (ie as in the leg circumference) found that can be used to optimize the fit for a particular size. In short, the geometry of the channel-forming areas should be adapted to the size of the wearer to ensure a better fit.

SUMMARY

The invention is directed to a series of absorbent articles comprising at least two absorbent articles of different sizes. Each article has a side facing the wearer and a side facing the clothing and an absorbent core between the side facing the wearer and the side facing the clothing. Each absorbent article further has a longitudinal axis, a front region, a rear region and a crotch region. The absorbent core comprises two channel-forming regions at least partially present in the crotch region of the article, these channel-forming regions being symmetrically disposed on opposite sides of the longitudinal axis and concave with the longitudinal axis, each channel-forming region having a length (KL) and a channel height (KH). having. The ratio of the length to the ratio (KL / KH) of the channel forming regions increases with the sizes of the article to provide an improved fit.

BRIEF DESCRIPTION OF THE DRAWINGS

1 Figure 11 is a plan view of an exemplary absorbent article in the form of a glued diaper, with the inner layers partially exposed, and including an absorbent core having two of the curved channel-forming regions;

2 shows a plan view of the absorbent core of 1 isolated;

3a shows a transverse cross section of the core of 2 ;

3b shows the same transverse cross section of the nucleus of 3a after the core has absorbed a liquid and swelled;

4 shows a close-up view of a central part of the channel formation area;

5a , b, c show schematically different absorption cores with different channel-forming regions that can be used to make a series of articles of the invention;

6a , b, c are like 5a , b, c with alternative channel-forming areas;

7 shows a core with alternatively shaped channel forming areas;

8th shows a core with alternatively shaped channel forming areas;

9 is a graph showing the relationship between growth and leg circumference (in mm) as a function of weight (in kg).

DETAILED DESCRIPTION OF THE INVENTION

General description of an absorbent article

An exemplary absorbent article according to the invention in the form of a glued baby diaper 20 is in 1 shown. 1 is a plan view of the exemplary diaper 20 in a flattened state, with portions of the structure cut away to more clearly show the construction of the diaper. The diaper 20 is shown for illustrative purposes only. The absorbent article may, for example, also be a pant-type article with preformed side seams. Unless otherwise stated, the dimensions and ranges disclosed herein relate to the article in this flat configuration. If a portion of the article is under tension due to the stretchable components, the article can typically be flattened using staples along the circumference of the article and / or a tacky surface so that the topsheet and backsheet can be stretched to provide tension are essentially flat. Closed items such as diaper pants can be cut along the side seams so that they can be laid out on a flat surface.

The absorbent article 20 includes a front edge 10 , a back edge 12 and two longitudinally extending lateral (lateral) edges 13 . 14 which the front edge and the rear. Connect edge. The front edge 10 is the edge of the article that is to be placed on the user's front when it becomes, and the back edge 12 is the opposite edge of the article. The absorbent article is thought to be through a longitudinal axis 80 Dividing from the leading edge to the trailing edge of the article, and dividing the article into two substantially symmetrical halves relative to this axis, when viewing the article from the side facing the wearer in a flat configuration as exemplified in 1 shown. This axis 80 can typically be with the longitudinal axis 80 ' of the absorbent core. The article has a length L as measured along the axis 80 from the rear edge to the front edge. The absorbent article can theoretically be defined by a transverse axis 90 divided into a front region and a rear region of equal length, measured on the longitudinal axis, when in such a flat state. The transverse axis 90 The article is perpendicular to the longitudinal axis 80 and is located at half the length of the article. The intersection of the longitudinal axis and the transverse axis is referred to herein as stepping point "C".

The absorbent article is also thought to be in a frontal area 36 , a rear area 38 , and a step area 37 divided in between. The front area 36 is defined as the area of the article extending from the front edge 10 extends, and has a length of one third of L along the longitudinal axis 80 on. The back area 38 is defined as the area of the article extending from the back edge 12 extends, and has a length of one third of L along the longitudinal axis 80 on. The crotch area 37 is the intermediate region between the front and the rear region, and also has a length of one third of L along the longitudinal axis 80 on.

The absorbent article 20 includes a side facing the wearer which in principle is a liquid pervious topsheet 24 a clothing-facing one from a liquid-impermeable backsheet 25 consists, and an absorbent core 28 that is between the upper layer 24 and the rear layer 25 is, can be formed. The absorbent core 28 is individually in 2 shown. The upper layer 24 , the rear position 25 , the absorbent core 28 and the other article components may be assembled in a variety of well known configurations, particularly by gluing and / or heat embossing.

Exemplary diaper rows, for example, are generally referred to in U.S. Pat US 3,860,003 . 5,221,274 . US 5,554,145 . US 5,569,234 . US 5,580,411 and US 6,004,306 described. The absorbent article is preferably thin, for example, having a caliper of from 2.0 mm to 8.0 mm, especially from 3.0 mm to 6.0 mm, the crotch point is measured using the Absorbent Article Ticket Test described below.

The item 20 may also include other components, such as a receiving layer and / or a distribution layer (collectively called acquisition distribution system (ADS)) and with 54 designated), and elasticized sealing cuffs 32 , which are present between or upper layer and the rear layer, and standing Sperrbeinbündchen 34 , The ADS may be profiled and / or arched towards the rear edge of the article, such as in the WO2014 / 093323 disclosed. 1 also shows other typical components of glued diapers, such as a fastening system, the fastening strip 42 includes, towards the rear edge 12 of the article and with an impact area 44 towards the front edge 10 of the article. These attachment features are typically absent in panty-type garments having preformed side seams. The absorbent article may also include other typical components not shown in the figures, such as a rear elastic waist feature, a front elastic waist feature, a transverse barrier member, a wetness indicator that changes appearance when in contact with urine, a cream application, etc. These components are well known in the art and will not be discussed in greater detail herein. It will be on the WO2014 / 093310 Reference is made in which several examples of these components are disclosed in more detail.

Conventionally, adjacent layers are bonded together using a conventional bonding method, such as adhesive coating by slot coating or spraying on all or part of the layer or heat bonding or pressure bonding or combinations thereof. The connection of the components is mostly not shown in the figure for reasons of clarity and readability. It should be understood that the layers of the article are linked together, if not specifically excluded. Adhesives can usually be used to improve the adhesion of the various layers, for example, between the backsheet and the core wrap, as in US Pat WO2012 / 170341A disclosed. The adhesive used can be any conventional hot melt adhesive as known in the art. The absorbent core 28 and the channel-forming ones 26 will now be described in more detail.

General description of the absorbent core 28 ,

As used herein, the term "absorbent core" refers to a single component of the absorbent article that includes an absorbent material enclosed in a core wrap. The absorbent core, as defined herein, does not include the acquisition distribution layer or a multi-layer system, if present. The core wrap is typically formed from one or two plies of nonwoven or tissue material, however, it is not excluded that in some articles of simple construction, the core wrap may be partially or fully formed by the topsheet and / or the backsheet. The absorbent core is typically the component of an absorbent article which has the greatest absorbency of all the components of the absorbent article and which comprises all or a majority of the superabsorbent polymer (SAP). The core may consist essentially or wholly of the core wrap, absorbent material and optional adhesives. The terms "absorbent core" and "core" are used interchangeably herein.

The absorbent cores according to the invention are essentially planar. By "substantially planar" is meant that the absorbent core can be laid flat on a flat surface. The absorbent cores may typically be thin and conformable so that during the manufacturing process they may also be laid out on a curved surface, for example a roller, or stored and used as an uninterrupted roll of stock material before being made into an absorbent article.

For ease of explanation, the exemplary absorbent core of the 2 until shown in a flat state. The absorbent core is relatively thin in relation to its other dimensions in the transverse direction (x) and the longitudinal direction (y).

These directions correspond to the transverse and the longitudinal direction of the article. Unless otherwise stated, the dimensions and ranges disclosed herein relate to the core in this flat configuration. The same is true for an absorbent article as exemplified in US Pat 1 is shown as a glued diaper, in which the core is integrated. The absorbent cores and articles according to the invention will be explained with reference to the figures and the numbering mentioned in these figures; however, these are not intended to limit the scope of the claims in any way except as otherwise stated.

The absorbent core shown 28 includes a front edge 280 , a back edge 282 and two longitudinally extending side edges 4 . 286 , which connect the front edge and the rear edge. The leading edge of the core is the edge which is positioned towards the front edge of the absorbent article in which the core is integrated. Usually, the front and rear edges 280 . 282 the core shorter than the long sides 284 . 286 of the core. The absorbent core further includes an upper surface 288 and a bottom 290 , The top of the core is in the finished article in the direction of the wearer (upper class 24 ) or should be placed there and the lower side is in the direction of clothing (lower layer 25 ) or should be arranged there. The upper side of the core wrap may be more hydrophilic than the lower side, for example after treatment with a wetting agent.

The absorbent core can theoretically through a longitudinal axis 80 ' be divided parallel to the longitudinal direction y, extending from the front edge 280 to the rear edge 282 and divides the core into two substantially symmetrical halves relative to the axis when the core is seen in the plane formed by the longitudinal and transverse directions (x, y). The length L "of the core is from the edge 280 towards the back edge 282 along the longitudinal axis 80 ' including the area of the core wrap that does not enclose the absorbent material, especially at the front and back end seals, if any. The crotch point of the core C 'is the point aligned vertically with the crotch point C of the absorbent article and normally also on the longitudinal axis 80 ' the absorbent core is arranged.

The width W "of the core is the maximum dimension of the core wrap, measured along the transverse direction x, which is perpendicular to y. The shape of the absorbent article defined by the core wrap may typically be generally triangular. The width W "and length L" of the core may vary depending on the intended. Use vary. The core wrap can also be shaped to have a width is narrower at the crotch point C 'front and / or rear of the Kernumwicklung. For baby care applications, such as diapers and infant diaper pants, the width of the core is typically in the range of 4 cm to 22 cm and the length in the range of 10 cm to 62 cm, depending on the size and capacity desired. The ratio of length to width (L "/ W") may be in the range of 2 to 10, for example. Adult incontinence articles can typically be longer and larger than baby articles and have larger dimensions.

The absorbent core comprises an absorbent material 60 that is included in the core wrap. The absorbent material may comprise a large proportion of superabsorbent polymer (herein abbreviated to "SAP"). As used herein, the term "superabsorbent polymer"("SAP") refers to absorbent materials which can be cross-linked polymeric materials and which can absorb at least 10 times their weight in 0.9% aqueous saline solution, as with the Centrifuge Retention Capacity Test (Centrifuge Retention Capacity, CRC) (EDANA method WSP 241.2-05E). In particular, the SAP may have a CRC of greater than 20 g / g or greater than 24 g / g or from 20 to 50 g / g or from 25 to 40 g / g. The SAP content may be at least 80% by weight and up to 100% by weight of the absorbent material contained in the core wrap. In particular, the SAP may be in powder form (SAP particles), but other forms are possible, such as, for example, absorption foam or absorption fibers. Further detailed examples of absorbent material, in particular SAP, are in the WO2014 / 093310 (Ehrnsperger) revealed. In particular, the absorbent material may comprise or consist of SAP particles having a time of less than 240 seconds, as measured by the K (t) test method, of 20 g / g (T20), as described in U.S. Pat WO2012174026 described is needed.

In particular, the absorbent material may be free of cellulosic fibers, which means that it comprises at least less than 20% by weight of cellulose fibers relative to the total weight of the absorbent material, more preferably less than 10% by weight or less than 5% by weight and even as little as 0 wt .-% cellulose fibers. The absorbent core may therefore be relatively thin, in particular thinner than conventional cores comprising cellulose fibers. In particular, the thickness of the core (before use), as at the crotch point (C ') or at any other point on the surface of the core according to the core thickness test described herein may be in the range of 0.25 mm to 5.0 mm, in particular 0, 5 mm to 4.0 mm.

The absorption material 60 forms an absorbent material deposition region 8th within the core wrap. The deposition region 8th may comprise a continuous layer of absorbent material in the plane of the core, as in FIG 2 shown. Alternatively, the deposition area may comprise separate or bonded impact areas comprising absorbent material and material-free connection areas therebetween. The basis weight (amount deposited per unit surface area) of the absorbent material may also be varied to produce a macroscopically-profiled distribution of the absorbent material in the longitudinal (x) and / or transverse (x) directions. Typically, the absorbent material of the core may advantageously be in a slightly lesser amount in the direction. the rear section 38 be distributed to the core, since typically in the direction of the crotch area and the front area a higher absorption is needed. However, other absorption material distributions are also possible, for example, a homogeneous distribution along the Absorptionsmaterialbereichs 8th be easier to produce.

The absorbent material deposition region 8th can be generally rectangular, as in 2 however, shaped absorbent material deposition regions are also desirable. A typically shaped deposition region tapers in the crotch region having at least one point where the width is less than the width of the absorbent material deposition region at the anterior and / or posterior regions where, in particular, a dogbone or hourglass shaped region of absorbent material is formed. Further detailed examples of absorbent material distribution that can be used herein are described in U.S. Patent Nos. 4,199,074; WO2014 / 093310 (Ehrnsperger) revealed.

Various absorbent core designs that have a high amount of SAP have been proposed in the past. The methods used may allow relatively precise deposition of SAP at a relatively high rate and may be used to prepare the absorbent cores of the present invention, see for example US5,599,335 (Goldman), EP1,447,066 (Busam) WO95 / 11652 (Dancer), US2008 / 0312617 (Hundorf) WO2012 / 052172 (Van Malderen) and in particular WO2012 / 170778 (Rosati et al., See also WO2012 / 170779 . WO2012 / 170781 and WO2012 / 170808 ).

The absorbent material may also be made, for example, using an SAP printing technique, such as that described in U.S. Pat US2006 / 024433 (Blessing) US2008 / 0312617 and US2010 / 0051166A1 (both on Hundorf et al.). This method uses a transmission device, such as a A platen roller for depositing SAP particles on a substrate disposed on a web of a carrier (eg, a platen roller). The net may include a plurality of crossbars extending substantially parallel to one another and spaced from one another to form ribs extending between the crossbars. The SAP is deposited inside these ribs. This technology allows for very rapid and precise deposition of SAP on a substrate, particularly to provide areas that are substantially free of absorbent material surrounded by absorbent material by which the core wrap can be self-bonded to channel-forming To form areas. For example, the regions that are substantially free of absorbent material may be formed by providing an area on the substrate on which no SAP is applied, and then bonding both sides of the core wrap through these regions that are free of absorbent material be bound. This can be achieved in the way that in the US2012 / 0312491 (Jackels) is revealed.

The core wrap may be formed by any substrate materials that are suitable for receiving and retaining the absorbent material. Typical substrate materials are in particular nonwoven, paper, paper towels, films, woven or laminate of any of these. The core wrap may be formed, in particular, by a nonwoven web, such as a carded nonwoven, spunbond ("S") or nonwoven ("M"), and laminates of any of these. For example, staple fiber polypropylene non-woven fabrics are suitable, in particular those with an SMS or SMMS SSMMS structure of the laminate web and with a from about 5 g / m ² to 15 g / m ^2. Suitable materials are, for example, in US2011 / 0268932A1 . US2011 / 0319848A1 and US2011 / 0250413A1 disclosed. It is also possible to use nonwovens made of synthetic fibers, such as PE, PET and in particular PP.

The core wrap can, as in the cross-sectional view of 3 shown a first substrate 16 that cover the top 288 of the core, and a second substrate 16 ' this is essentially the bottom side 290 of the core. Alternatively, it is known in the art to make a core wrap from a single substrate or to use the backsheet or topsheet as a substrate to directly, partially or completely form the core wrap. If two substrates are used, the core wrap can be C-wrapped along all the long side edges 284 . 286 of the core. The core wrap is not considered absorbent material for the purpose of calculating the percentage of SAP in the absorbent core. Examples of a core wrapping construction will be found in U.S. Pat WO2014 / 093310 explained in more detail.

The absorbent core may comprise one or more layers of adhesive to immobilize the absorbent material. The absorbent core 28 may be at least one auxiliary adhesive layer 71 . 72 which is applied to the inner surface of the upper side and / or the lower side of the core wrapping. The auxiliary adhesive may be applied directly over the substrate on which the absorbent material is subsequently deposited, thereby at least partially immobilizing the absorbent material on the substrate. The auxiliary adhesive may also at least partially core-wrap bond 27 the channel-forming areas 26 form. The auxiliary adhesive may also be useful to improve the adhesion of a fibrous thermoplastic material, if any, to the substrate. The auxiliary adhesive can be applied by an adhesive applicator known in the art, in particular ball, slot or. The auxiliary adhesive may be applied as a pattern using a slot coating method that includes a plurality of spaced slots each extending longitudinally. The slots may, for example, have a width of 0.5 mm to 3 mm, and / or have a lateral spacing of 0.5 mm to 4 mm between them.

The absorbent core 28 may also comprise a fibrous thermoplastic adhesive material (not shown), also known as microfiber adhesive, to immobilize the absorbent material 60 to support within the core transformation. The fibrous thermoplastic adhesive material may be applied, typically by spraying, over an absorbent material that has been discontinuously deposited on a substrate during the core manufacturing process, thereby forming landing and bonding regions as noted above. The fibrous thermoplastic adhesive material contacts the absorbent material and the substrate layer in the regions that are free of absorbent material. This imparts a substantially three-dimensional structure to the fibrous layer of thermoplastic adhesive material, which per se is essentially a two-dimensional structure of relatively small thickness compared to the length and width directions. This allows the fibrous thermoplastic adhesive material to provide voids to cover the absorbent material and thereby render this absorbent material immobile. Thus, a two-ply core can be constructed, with the patches of one ply fitting the material-free bond regions of the other ply, and vice versa, resulting in a continuous dual absorbent layer.

These adhesives and their use in an SAP printing process are also generally described in U.S. Pat US2006 / 024433 (Blessing) US2008 / 0312617 and US2010 / 051166A1 (both on Hundorf et al.) and the US2014 / 027066A1 disclosed. The absorbent cores can advantageously provide sufficient immobilization of the absorbent material in a dry and wet condition. The absorbent core advantageously achieves an SAP loss of no more than about 70%, 60%, 50%, 40%, 30%, 20%, 10% according to the method described in U.S. Pat US2010 / 051166A1 described wet immobilization test.

Channel forming areas 26

Each absorbent core further comprises at least two channel-forming regions 26 , which will now be described in more detail. The channel-forming areas 26 may each comprise an absorbent material-free region in which a core wrap bond 27 is available. The channel-forming regions typically can not be visible in the article of opacity of the other layers of the article prior to use, especially if the absorbent core is substantially free of cellulose fibers and therefore only a few mm thin. The thickness of the core 28 in the dry state, as in the 3 is shown exaggerated to allow the channel forming areas 26 and the core development bond 27 be clearly shown.

The channel-forming regions do not swell significantly, at least initially, because the absorbent core absorbs urine or other liquid, while the absorbent material can swell significantly adjacent the channel-forming regions. The channel-forming regions therefore form three-dimensional channels when the absorbent material absorbs and swells a liquid adjacent to the channel-forming regions. As the core absorbs more fluid, the wells become within the absorbent core, through the core wrap bond 27 formed between the two substrates, deeper and visible and tactile. If the core wrap bond is sufficiently strong, and / or with a relatively extensible substrate material, the channels may remain until saturation of the absorbent material is complete. On the other hand, the core wrap bond 27 be designed to at least partially open or break when the core is near saturation so as not to unnecessarily restrict the swelling of the absorbent material when the core is significantly saturated.

The channel-forming regions can be formed in different ways. In particular, the channel-forming regions may be regions of the core that is substantially free of absorbent material and through which the upper side of the core wrap is bonded to the lower side of the core wrap. The core development bond 27 between the upper side and the lower side of the core wrap in these areas may be at least partially by an auxiliary adhesive 71 . 72 and / or microfiber glue (not shown) formed directly on the inner surface of at least one of the substrates. This is exemplified in the example WO2012 / 170778 shown. However, it is also known to form bonds using other bonding agents such as ultrasonic bonding, pressure bonding or thermal bonding. The channel forming regions may not possibly include such core wrap bonds, however, the resulting channels may then be less resistant to compression, and the absorbent material may fill the channel regions relatively quickly as the article is being worn. The channel-forming regions may also be formed by core wrap bonding with minimal or no surrounding absorbent material-free regions.

The channel-forming areas 26 are pairwise symmetrical on opposite sides of the longitudinal axis of the article 80 formed and are the longitudinal axis 80 of the article concave. By "concave to the longitudinal axis" is meant that the channels have a point or area closest to the longitudinal axis (typically in the crotch area of the article) and that the channels generally branch off from this next point or area as the channels move downstream extend forward or backward in the article. The smallest distance or the smallest gap between the two areas may for example be at least 5 mm or at least 10 mm, or at least 16 mm, and may be up to 40 mm, for example.

The channels may advantageously be curvilinear. The curve may have a substantially constant radius of curvature along the length of the curved portion, as in FIG 2 shown, or this radius can be as in 6a vary. It is also not excluded that at least a portion of the channels may be straight and / or may have multiple straight segments. For example, the channel-forming regions may be approximated by two lines that meet at the point closest to the longitudinal axis and together form a shallow V, as in FIG 7 shown. The channel forming areas may also include three or more segments, as in FIG 8th shown.

Although not shown in the figures, it is not excluded that a part of the channel-forming regions is not concave in the direction of the longitudinal axis, for example, that a part of the channels at the extremities in the direction of the front and / or rear of the core parallel to the longitudinal axis or even convex (and in the direction of converging). In this case, only the concave section of the channel-forming areas is taken into account for calculating the length-to-height ratio (see below) of the channel-forming areas. The absorbent core may further comprise channel-forming regions in addition to the curved pairs, in particular channel-forming regions that are not curved or that are arranged only in the front region of the article, as in FIG WO2012 / 170779 disclosed.

The channel-forming areas 26 can be essentially free of absorbent material, so that the bond 27 between the upper side 288 and the bottom side 290 the core wrap can be easily formed within these areas, which are substantially free of absorbent material, for example, by gluing and / or pressure bonding of these two surfaces. By "substantially free of absorbent material" is meant that there is virtually no absorbent material in these areas. Minimal amounts, such as unintentional contamination with absorbent material particles which may occur during the manufacturing process, are neglected. Within the channel forming areas becomes the upper side 288 the core wrap at the bottom 290 through a core wrap bond 27 attached, as in the 2 to 3 shown. The section of channel-forming areas immediately adjacent to the binding 27 may be substantially free of absorbent material. The channel-forming regions in total, including this absorbent material-free region, may have a width Wc. In this example, the width of the channel-forming area 26 that corresponds to an area that is substantially free of absorbent material, about 8 mm, and channel binding 27 can be about 2 to 3 mm. The channel-forming regions may be at least part of their length over a width Wc, at least 2 mm, or at least 3 mm, or at least 4 mm, up to, for example, 20 mm, or 16 mm or 12 mm substantially free of absorbent material , The width Wc of the regions that are substantially free of absorbent material may be constant over substantially the entire length or vary along the length of the channel-forming regions.

The channel-forming areas 26 and bindings 27 In view of the plane of the core, it is advantageous for the absorption material 60 surround. In particular, they advantageously can not extend to any of the edges of the absorbent material absorbent material deposition region to reduce the risk of leakage. Typically, the minimum distance between a channel-forming region and the next edge of the core wrap is at least 5 mm, or advantageously at least 10 mm.

Swells the absorption material 60 due to the absorption of a liquid, the core wrap bonds remain 27 at least initially at the channel-forming areas 26 attached. If the absorption material 60 swelled in the remainder of the core, the core wrap forms channels, ie elongated depressions, along the core wrap bond 27 , as in 3b shown. These channels 26 ' are three-dimensional and have been found to function as bend lines that promote the diaper's flexing to conform to the anatomy of the wearer and thus improve the fit of the diaper. The channels may also serve to pass an infiltrating liquid along their length to a wider area of the core. They can provide a faster fluid uptake rate and better utilization of the absorbent capacity of the core. The channels may further include deformation of an overlying layer such as a fibrous layer 54 provide and provide corresponding grooves in the overlying layer. The absorbent core may comprise other regions that are substantially free of absorbent material, such as the spaces between the absorbent material regions, but without a core wrap bond, these unbonded regions typically do not form permanent, three-dimensional channels.

The core development bond 27 may also be designed to open in a controlled manner when exposed to a large amount of fluid. The bonds may therefore remain substantially at least during a first phase when the absorbent material absorbs a moderate amount of liquid. In a second phase, the core wrapping bonds 27 in the channels begin to open up to provide more space for swelling of the absorbent material while retaining most of the channel benefits, such as increased lateral flexibility of the core and liquid handling. In a third phase, which corresponds to a very high saturation of the absorbent core, a much larger portion of the channel bonds can open to provide more space for the intumescent absorbent material. The strength of the core wrap bond 27 For example, the channels can be varied by varying the amount and type of adhesive used to attach the two sides the core wrap is used, the pressure used to make the core wrap bond, and / or the distribution of the absorbent material, as more absorbent material will typically cause swelling and put more pressure on the bond. The core wrap material can also play a role.

The core development bond 27 can along any channel-forming area 26 however, it may not be continuous (interrupted), for example when it is formed by multiple point bonds. Each channel-forming area 26 is also advantageously continuous, but it is not excluded that it is formed from a separate area which is separated by small gaps, as long as a generally concave outline is formed by the separate areas. An auxiliary glue 71 . 72 if present, can be at least partially involved in the formation of the bond 27 help. Typically, a pressure on the substrates in the areas 26 be applied so that the auxiliary adhesive forms the bonds between the substrates better. However, it is not excluded that the core development bond 27 via other known fastening means, for example by pressure bonding, ultrasonic bonding or thermal bonding, or a combination thereof, in which case the width of the channel-forming regions can be even more reduced. Will be an auxiliary glue 71 . 72 on the inner surface of each of the substrates 16 . 16 ' As a series of longitudinally aligned slots, the width and frequency of these slots may advantageously be such that at least one slot of the auxiliary adhesive is present on each plane of the channel in the longitudinal direction. For example, the slots may be 1 mm wide, with a 1 mm gap between adjacent slots, and the absorbent material-free areas that form the channel-forming areas have a width of about 8 mm. In this example are on average 4 Slots of auxiliary adhesive in each of the areas 26 available.

In general, the core wrap bonds can 27 have the same contour as the absorbent material-free regions, but due to the tolerance required in manufacturing processes, be slightly smaller than this.

The channel-forming areas 26 are at least in the crotch area 37 every article available; in particular, they may be extended sufficiently to extend through the entire crotch area and into the front and / or rear of the article. The channel-forming areas 26 Therefore, they may have a length KL which is at least 25% of the length L of the article, in particular at least 33% or even at least 40% of L, up to 90% or 80% of L.

The channel-forming areas 26 are further characterized by the ratio of their channel length (KL) to the channel height (KH). The channel length (KL) corresponds to the distance between the two extremities of the channel-forming regions, as in 2 through the line 126 including the absorbent material-free area, if present. If the channel-forming regions have a measurable width Wc, the center of the channel-forming regions at the extremities is used to measure the channel length.

The straight line 126 that connects these two extremities can be generally parallel to the longitudinal axis 80 ' of the core (cf. 2 However, it is not excluded that this line has an angle with respect to the longitudinal axis when one of the extremities is transversely inclined with respect to the other extremity. Such an angle may be, for example, up to 25 °, or up to 20 °, with respect to the longitudinal axis 80 the article or the longitudinal axis 80 ' of the absorbent core amount.

The channel height (KH) is the largest distance between the line 126 which connects the two extremities of the channel-forming regions and the remainder of the channel-forming region, as at right angles to the connecting line 126 measured. This is in 4 shown a close up view of the relevant part of 2 is, in which the distance KH is measured. Have the channel-forming areas 26 a measurable width, as shown, the channel height is measured by looking at the central portion of the channel forming area 26 Reference is made, which is typically the middle of the binding 27 can be, as in 4 shown.

The inventors have found that, among a number of article sizes with concave channel forming regions, the ratio of KL / KH to the sizes of the article should increase to provide an optimum fit for at least two of the articles in the series, especially for at least three of them Items. This will be explained further in the next section.

Series of absorption products

The present invention is directed to a series of absorbent articles comprising at least two distinct articles, more particularly at least three articles comprising channel-forming regions as previously indicated, and wherein the KL / KH ratio of the articles increases with the size of the articles. The size of the article can typically be marked directly on the absorbent article, for example printed on the backsheet, and is also typically marked on the package of the absorbent articles to facilitate user selection. The "user" as defined herein may be the one who is responsible for the baby care articles or the wearer even for adult incontinence articles. The articles in the series are typically part of a series or system of absorbent articles covering a range of different article sizes. The number of absorbent articles can typically be marketed under a common primary label, usually as a trademark such as Pampers ^® or Luvs ^® (both trademarks of the Procter & Gamble Company). The articles of the series can also be marketed under a secondary designation that is the same or different for each article in the series, for example, Baby-Dry ^™ or Cruisers ^™ .

The sizes of the articles may be directly related to the weight of the intended user, typically as the weight range. For example, the item size for baby care products can be specified as a number (size 0, 1, 2 ... 6), as a number (XS, S, M, L, XL ...), as a short description (newborn, mini, midi, Maxi, ...) or as a combination of these. Typically, the amount of absorbent material increases with the size of the article, and advantageously also the length and width of the article. The size of the article may therefore typically increase with the weight of the wearer, however, it is also possible that the size of the article may additionally or alternatively be related to the wearer's age or urine absorption requirements.

Since the needs of the wearer vary over the ranges, the same size designation may be used by the manufacturer for items having different weight ranges. For baby care items, the following table indicates, for example, the different size specifications for the weight ranges (in kg), indicated for baby diapers sold at the filing date under the name Pampers ^® Baby-Dry ^TM in different geographical regions. region size 1 2 3 4 5 6 North America 4-6 5-8 7-13 10-17 12+ 16+ Western Europe - 3-6 4-9 7-18 11-25 16+ Eastern Europe and Russia 2-5 3-6 4-9 7-14 11-18 15+ China <5 3-8 6-11 9-14 12-17 > 15

The articles may be offered for sale in various packaging, from a single packaged product to a jumbo carton box comprising more than one hundred articles.

A view of absorbent cores with channel-forming regions with different KL / KH ratios has been provided schematically in FIG 5a , b, c and 6a , b, c shown. These cores may be used, for example, in articles having different sizes to form a series of articles of the invention wherein the size of the absorbent article increases from left to right. To more clearly illustrate the increase ratio of KL / KH from left to right, these cores have been shown with the same length and width, however, it is believed that the cores for the smaller size articles are generally smaller in the transverse and longitudinal directions. The ratio KL / KH for the core 285a , shown on the left, (KL1 / KH1) is larger than the ratio for the nucleus 285b , which was shown in the middle, even larger than the ratio for the core 285c is located on the right side (KL3 / KH3). In other words, if everything is considered the same, the curvatures formed by the channel-forming regions become flatter as the size of the article increases.

6a , b, c, similarly show a different type of curvature of the channel-forming regions, wherein the core wrap bond of the core has a radius of curvature that is emphasized toward the rear or front side edge of the core. This may be particularly useful for aligning or in the vicinity of the point of curvature having the maximum channel height at the crotch point C 'of the core bring. The general ratio of the ratio KL / KC is maintained in this example (KL'1 / KH'1>KL'2 / KH'2> KL3 '/ KH3') so that a series of the product according to the invention can be provided, by providing these cores from left to right in the absorbent products of increasing sizes. The same applies, of course, to the core that is in 7 and 8th was shown.

Channel-forming areas provide bend lines that help improve the fit and comfort of the article. Ideally, these bending lines should follow the natural curvature of the body, particularly at the areas where the wearer's torso and thighs connect (the so-called "crotch line" or "gusset") that form an area with a lot of movement (towards the leg) and a region of little movement (in the direction of the trunk). This curvature changes with the age and weight of babies or with the body mass index in adults. By adjusting the length of the channel and its curvature ratio, it is possible to favor intended wrinkles in the absorbent core matching the baby legs around the crotch area of the wearer. Although the inventors do not wish to be bound by this theory, they assume that the rate of growth of babies (leg circumference) is greater in morphological change in babies under 9 months than in older babies, and they estimate a growth ratio relative to diaper size Range of 14 to 16% in younger babies (babies up to 9 kg) in proportion to 6 to 10% in older babies.

In addition, improved bowing may be achieved as the channels extend from the crotch to the front and / or back of the absorbent article and extend across transitional areas between the upper and lower ranges of motion of the wearer's crotch. It is believed that the leg hoop (the oval circumference around the leg following the crotch line) and the rise (defined as the distance from the navel to a correspondingly high point on the baby's back) are also common in smaller babies increase more than larger babies. This is in 9 shown graphically. It may also be advantageous that the channel length increases in a manner similar to the growth of the baby. In a first approximation, and without being committed to these experimental numbers, the following formula, describing a favorable channel length as a function of baby weight, was found: KL = -0.36M ² + 17.5M + 62 (in mm), where M is the weight of the baby in kg. The ratio KL / KH should also increase as a function of leg ring and elevation, although it is more difficult to pinpoint this increase as a weight function. Also, regional consumer habits and habits may influence the perfect fit of the fit in some cases.

example

The following table numerically shows an example of the dimensions (KL = channel length, KH = channel height) of the channel-forming regions and how these may vary among a range of different-sized absorbent articles.

The articles are baby diapers. The ratio of article size to weight range was used at the time of registration for Pampers. diaper size 1 2 3 4 5 6 Weight range (kg) 2-5 3-6 4-9 7-18 11 to 25 > 15 KL (mm) 138 159 197 227 227 254 KH (mm) 17 17 17 17 17 17 Ratio KL / KH 8.1 9.4 11.6 13.4 13.4 14.9 Percent increase in the KL / KH ratio - 15 24 15 0 11

The percentage increase value shows the increase of the KL / KH ratio from one size to the next size. In this example, a series of articles according to the invention are formed by the size 1, 2, 3 (or 4), 5 and 6. This example also shows that in some cases the same channel design can be acceptable over more than one offered item size (size 4 and size 5), especially if the weight range of the baby has a significant overlap in these item sizes, or if the differences in ideal channel dimensions reduce costs and costs Complexity that does not warrant the presence of multiple designs. Additional product sizes may be included in the series, in particular Intermediate sizes such as size 4+ or size 5+, or for newborns (size 0 or "N") as known in the art. The series of articles can be sold, for example, an existing primary term that is typically a trade name, ^® for example, Pampers ^®, and one or more secondary names such as Baby-Dry ^®, New-Born, Active Fit or Swaddlers ^®. The ratio of weight ranges to article size given in the table above may be varied by the manufacturer, especially for other product lines or regions or times.

The amount of absorbent material, especially superabsorbent polymer particles, present in the article can typically increase with the size of the article.

The amount of AGM can typically be changed by the manufacturer depending on the changing habits in the regions concerned, the absorbency and the cost of the SAP used. As a purely illustrative example, the following amount of commercially available SAP can be used in the cores described above. diaper size 1 2 3 4 5 S6 Amount of SAP (g) per core 6 6.5 9 12.5 13.5 14.8

test method

The values given here are measured according to the procedures given below, unless otherwise specified. All measurements are carried out at 21 ° C ± 2 ° C and 50% ± 20% RLF, unless otherwise stated. All samples should be kept for at least 24 hours under these conditions to equilibrate prior to performing the assays unless otherwise stated.

All measurements should be reproduced on at least 4 samples and the mean indicated unless otherwise stated.

Centrifuge retention capacity test (CRC)

The CRC measures the fluid absorbed by the superabsorbent polymer particles for free swelling in excess fluid. The CRC is measured according to the EDANA method WSP 241.2-05.

Thickness test method for dry absorption cores

This test can be used to measure the thickness of the absorbent core (before use, ie without liquid loading) in a normalized manner. This text is detailed in the WO2014 / 093311 which is hereby incorporated by reference.

Thickness test method for absorbent articles

The thickness test method for absorbent articles can be carried out as for the dry absorbent core thickness test method, with the difference that the thickness of the finished absorbent article is measured instead of the thickness of the core. Further details for this text are also in the WO2014 / 093311 explained.

General

As used herein, the terms "comprising" and "comprising" are open-ended terms; specifies the presence of a following feature, e.g. A component, but excludes the presence of other features, e.g. Elements, steps, components known in the art, or disclosed herein. These terms, which are based on verb "comprising", are to be read to mean the narrower terms "consisting of," any element, any step or any ingredient that is not mentioned, and the way the trait works , and the term "consisting of" which includes any element, step or ingredient not mentioned. All preferred embodiments or embodiments described below do not limit the scope of the claims unless expressly stated otherwise. The words "typically", "normally", "preferred", "advantageously", "especially" and the like also describe features that It is not intended to limit the scope of the claims unless specifically indicated. Any feature or component described herein in connection with one embodiment may be combined with another feature or component of another embodiment, unless otherwise specified.

Unless otherwise stated, the description and claims refer to the absorbent article, absorbent core or component thereof prior to use (ie, dry and not soaked with a liquid) and for at least 24 hours at 21 ° C +/- 2 ° C and 50 +/- - 20% relative humidity (RH) conditioned.

The dimensions and values disclosed herein should not be construed as being strictly limited to the exact numerical values given. Instead, unless stated otherwise, each of these dimensions is intended to mean both the indicated value and a functionally corresponding range surrounding this value. Thus, the dimension disclosed as "40mm" is intended to mean "about 40mm".

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 2012/170778 [0005, 0037, 0046]
• WO 2012/170779 [0005, 0037, 0049]
• WO 2012/170781 [0005, 0037]
• WO 2012/170808 [0005, 0037]
• WO 2014/093319 [0005]
• WO 2014/093310 [0005, 0024, 0033, 0036, 0040]
• WO 95/11652 [0005, 0037]
• WO 2012/052172 A1 [0005]
• WO 2008/023291 [0006]
• US 3860003 [0023]
• US 5221274 [0023]
• US 5554145 [0023]
• US 5569234 [0023]
• US 5580411 [0023]
• US 6004306 [0023]
• WO 2014/093323 [0024]
• WO 2012/170341 A [0025]
• WO 2012174026 [0033]
• US 5599335 [0037]
• EP 1447066 [0037]
• US 2008/0312617 [0037, 0038, 0043]
• WO 2012/052172 [0037]
• US 2006/024433 [0038, 0043]
• US 2010/0051166 A1 [0038]
• US 2012/0312491 [0038]
• US 2011/0268932 A1 [0039]
• US 2011/0319848 A1 [0039]
• US 2011/0250413 A1 [0039]
• US 2010/051166 A1 [0043, 0043]
• US 2014/027066 A1 [0043]
• WO 2014/093311 [0077, 0078]

Claims (34)

A series of at least two absorbent articles of different sizes, the articles comprising a wearer-side, a garment-facing side and an absorbent core ( 28 ) comprising an absorption material ( 60 ) between the side lying to the wearer and the side lying to the clothing, wherein each absorbent article is purely mentally a longitudinal axis ( 80 ), a front area ( 36 ), a rear area ( 38 ) and an intermediate step area ( 37 each region being one third of the length of the article measured along the longitudinal axis, the absorbent core having two channel-forming regions (FIG. 26 ) which are at least partially present in the crotch region of the article, said channel forming regions being symmetrically disposed on opposite sides of the longitudinal axis and being concave to the longitudinal axis, each channel forming region having a length (KL) and a height (KH), characterized in that the ratio of length to height (KL / KH) of the channel-forming regions increases with the size of the articles. A set according to claim 1, comprising three absorbent articles of different sizes according to claim 1.  A series of absorbent articles according to the preceding claim, wherein the length of the channel-forming regions increases with the size of the article. A series of absorbent articles according to any one of the preceding claims, wherein the length to height ratio of the articles of the series is in the range of 5 to 40. A series of absorbent articles according to any one of the preceding claims, wherein the length to height ratio between two successive sizes of the series increases by at least 10%. A series of absorbent articles according to any one of the preceding claims, wherein for each article in the series, the channel-forming regions have a length (KL) of between 25% and 90% of the length (L) of the article. A series of absorbent articles according to any one of the preceding claims, wherein the amount of absorbent material, in particular the amount of superabsorbent polymer, in each absorbent core increases with the size of the absorbent article of the series. A series of absorbent articles according to any one of the preceding claims wherein the absorbent core of each article of the series is substantially free of cellulosic fibers. A series of absorbent articles according to any one of the preceding claims, wherein the absorbent material ( 60 ) of each absorbent core of the series comprises at least 90% by weight of superabsorbent polymer particles, in particular wherein all of the absorbent material consists of superabsorbent polymer particles. A series of absorbent articles according to any one of the preceding claims, wherein the absorbent material ( 60 ) of each article from a nuclear envelope ( 16 . 16 ' ) and the channel-forming regions are formed by the upper side (288) of the core sheath with the lower side of the core sheath ( 290 ) along a nuclear envelope bond ( 27 ) is attached. The array of claim 10, wherein the channel-forming regions comprise a region that is substantially free of absorbent material surrounded by absorbent material and through which the core-sheath bond (FIG. 27 ) is formed. A series of absorbent articles according to any of the preceding claims 10 or 11, wherein the core-sheath bond is formed by at least one of gluing, pressure bonding and / or ultrasonic bonding. A series of absorbent articles according to any one of the preceding claims, wherein the absorbent material is enclosed by a core sheath and further comprises a thermoplastic adhesive material which immobilizes at least a portion of the absorbent material within the core sheath, in particular an auxiliary adhesive ( 71 . 72 ) on the inner side of the upper side and / or lower side of the core sheath, and / or a mesh of microfiber adhesive applied to the absorbent material. A series of articles comprising a series of absorbent articles according to any one of the preceding claims. A series of baby care nappies according to claim 14, wherein the series comprises at least five different articles whose sizes are subdivided according to the weight of the baby. A series according to the preceding claim, wherein the sizes of the articles of the series are selected from the groups consisting of: - a first size corresponding to a baby weight range limited to 4 kg; - a second size corresponding to a baby weight range limited to 5 kg; - a third size corresponding to a baby weight range limited to 8 kg; - a fourth size corresponding to a baby weight range limited to 12 kg; - a fifth size corresponding to a baby weight range limited to 14 kg; - a sixth size corresponding to a baby weight range limited to 17 kg. A series of at least two absorbent articles of different sizes, the articles comprising a wearer-side, a garment-facing side and an absorbent core ( 28 ) comprising an absorption material ( 60 ) between the side lying on the wearer and the side lying on the clothing, each absorbent article having a longitudinal axis of thinking ( 80 ), a front area ( 36 ), a rear area ( 38 ) and an intermediate step area ( 37 each region being one third of the length of the article measured along the longitudinal axis, the absorbent core having two channel-forming regions (FIG. 26 ) which are at least partially present in the crotch region of the article, each channel forming region having a length (KL) and a height (KH), characterized in that the length to height ratio (KL / KH) of the channel forming regions is equal to the length Size of the article changes. A set according to claim 17 comprising three absorbent articles of different sizes according to claim 17. A series of absorbent articles according to claim 17 or 18, wherein the length of the channel-forming regions increases with the size of the article. A series of absorbent articles according to any of the preceding claims 17-20, wherein the length to height ratio of the articles of the series ranges from 5 to 40. A series of absorbent articles according to any one of the preceding claims 17-21, wherein the length to height ratio between two successive sizes of the series increases by at least 10%. Absorbent article article according to any one of the preceding claims 17-21, wherein for each article in the series, the channel-forming regions have a length (KL) of between 25% and 90% of the length (L) of the article. A series of absorbent articles according to any of the preceding claims 17-22, wherein the amount of absorbent material, in particular the amount of superabsorbent polymer, in each absorbent core increases with the size of the absorbent article of the series. A series of absorbent articles according to any of the preceding claims 17-23 wherein the absorbent core of each article of the series is substantially free of cellulosic fibers. A series of absorbent articles according to any one of the preceding claims 17-24, wherein the absorbent material ( 60 ) of each absorbent core of the series comprises at least 90% by weight of superabsorbent polymer particles, in particular wherein all of the absorbent material consists of superabsorbent polymer particles. A series of absorbent articles according to any of the preceding claims 17-25, wherein the absorbent material ( 60 ) of each article from a nuclear envelope ( 16 . 16 ' ) and the channel-forming areas are formed by the upper side ( 288 ) of the nuclear envelope with the lower side of the nuclear envelope ( 290 ) along a nuclear envelope bond ( 27 ) is attached. A row according to claim 26, wherein the channel-forming regions comprise an area substantially free of absorbent material surrounded by absorbent material and through which the core-sheath ( 27 ) is formed. A series of absorbent articles according to any one of the preceding claims 26 or 27, wherein the core-sheath bond is formed by at least one of gluing, pressure bonding and / or ultrasonic bonding. A series of absorbent articles according to any one of claims 17-28, wherein the absorbent material is enclosed by a core sheath and further comprises a thermoplastic thermoplastic adhesive material which immobilizes at least a portion of the absorbent material within the core sheath, in particular an auxiliary adhesive ( 71 . 72 ) on the inner side of the upper side and / or lower side of the core sheath, and / or a mesh of microfiber adhesive applied to the absorbent material. A series of articles comprising a series of absorbent articles according to any one of the preceding claims 17-29. A series of baby care nappies according to claim 30, wherein the series comprises at least five different articles whose sizes are subdivided according to the weight of the baby. A series according to the preceding claim, wherein the sizes of the articles of the series are selected from the groups consisting of: - a first size corresponding to a baby weight range limited to 4 kg; - a second size corresponding to a baby weight range limited to 5 kg; - a third size corresponding to a baby weight range limited to 8 kg; - a fourth size corresponding to a baby weight range limited to 12 kg; - a fifth size corresponding to a baby weight range limited to 14 kg; - a sixth size corresponding to a baby weight range limited to 17 kg. A set of at least two different sized absorbent articles, wherein the article comprises a wearer facing side, a garment facing side and an absorbent core 28 ) comprising an absorption material ( 60 ) between the side lying on the wearer and the side lying on the clothing, each absorbent article having a longitudinal axis of thinking ( 80 ), a front area ( 36 ), a rear area ( 38 ) and an intermediate step area ( 37 each region being one third of the length of the article measured along the longitudinal axis, the absorbent core having two channel-forming regions (FIG. 26 ) which are at least partially present in the crotch region of the article, each channel forming region having a length (KL) and a height (KH), characterized in that the length to height ratio (KL / KH) of the channel forming regions coincide with that Size of the article changes. The array of claim 33, wherein the length to height ratio (KL / KH) of the channel forming regions increases with the size of the articles.

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