OA19374A - Absorbent article comprising elastomeric strips. - Google Patents

Abstract

The present invention discloses a disposable or wearable absorbent article (1) that includes one or more elastomeric strand(s) (14) and/or strip(s) (16) on/in the backsheet (12) layer, localized in the absorbent core (10) region. The absorbent article (1) is preferably a baby diaper, an incontinence diaper, a pant or o pull up garment. The article may have a topsheet (6), a backsheet (12) and absorbent core (10) disposed between the topsheet (6) and backsheet (12), and a pair of longitudinal side edges. Elastomeric strand(s) (14) and/or strip(s) (16) is attached in longitudinal axis of the backsheet (12) of the absorbent article(l) in stretched form, whereby backsheet takes a crinkled form when it is in relaxed state. The absorbent article (1) fits better on users buttocks without sagging when the article is being worn.

Description

The présent invention is related to an absorbent article (1) such as, but not limited to, baby diapers, training pants and adult incontinence products comprising elastomeric strand(s) (14) and/or strip(s) (16) to provide fit shape structure and antisagging property to absorbent article (1 ).

The term absorbent article used herein refers to disposable or wearable absorbent 15 articles such as baby diapers (2), training pants (4), adult incontinence products, and the like which are put on to absorb bodily fluids and retain the various exudates discharged from the body. Typically these articles comprise a topsheet (6), a backsheet (12), an absorbent core (10) and optionally an acquisition/distrubition (8) layer which may be comprised of one or more layers and typically other components, 20 such as fastening members, cuffs and frontal tape structure.

The présent invention relates to an absorbent article (1) providing an improved fit in both dry and wet States and providing improved comfort for the wearers.

Dry state refers to, the absorbent article (1 ) being worn to the wearer but not loaded with body liquid or feces, or to the absorbent article (1) not being worn yet.

Wet state refers to, the absorbent article (1) which is in use and loaded with bodily fluids or feces.

The présent invention relates to an absorbent article (1) having antisagging property in loaded and not loaded state during the use.

The absorbent article (1) in the présent invention comprises a liquid permeable 30 topsheet (6), a liquid imperméable backsheet (12), an absorbent core (10) located between the topsheet (6) and the backsheet (12), and an acquisition-distribution layer (ADL) (8), located between the topsheet (6) and the absorbent core (10). The absorbent article (1) may also comprise a liquid imperméable barrier leg cuffs substantially planar with the châssis of the absorbent article (1).

The présent invention is disclosed with the given non-limiting embodiments;

In one embodiment, the backsheet (12) of the absorbent article (1) is shaped with at least one strand (14) and/or strip (16), as like having channels when the absorbent article (1 ) is in dry and in wet state during the use.

According to the présent application, formed channels can not be deformed by external forces, because the channels are formed permenantly with the help of hot melt adhesive used for attaching the elastomeric strand(s) (14) and/or strip(s) (16)-on the backsheet (12).

Additionally, as an advantage of the présent invention, superabsorbent polymers and/or cellulose fibers can be used as absorbent core (10) material separately or in mixtures.

In one embodiment, said elastomeric strand(s) (14) and/or strip(s) (16) is extended longitudinaly up to some extend before attaching on the backsheet (12) in fiat position.

In one embodiment, used elastomeric strand(s) (14) and/or strip(s) (16); is attached on at least one face of the backsheet (12) with help of adhesives.

In one embodiment, said elastomeric strand(s) (14) and/or strip(s) (16) is extended longitudinaly up to some extend before attaching in/on the polymeric film layer (18) of the backsheet (12) in fiat position.

In one embodiment, said elastomeric strand(s) (14) and/or strip(s) (16) is extended longitudinaly up to some extend before attaching on the polymeric film layer (18) of the backsheet (12) in fiat position.

In one embodiment, said elastomeric strand(s) (14) and/or strip(s) (16) is extended longitudinaly up to some extend before attaching on the interior surface of the polymeric film layer (18) of the backsheet (12) that is in contact with the absorbent core (10).

In one embodiment, said elastomeric strand(s) (14) and/or strip(s) (16) is extended longitudinaly up to some extend before attaching on the exterior surface of the polymeric film layer (18) of the backsheet (12) that is in contact with the nonwoven web layer (20).

In one embodiment, said elastomeric strand(s) (14) and/or strip(s) (16) is extended longitudinaly up to some extend before attaching in the polymeric film layer (18) of the backsheet (12) in fiat position.

In the présent invention; the term of elastomeric strand used herein means, only one string or band formed by elastomeric polymer material. And the term of elastomeric strip used herein means that, one elastomeric strand (14) has a width up to some extend or more than one elastomeric strands (14) corne together as plurality of elastomeric strands (14) to form an elastomeric strip (16). At least one elastomeric strand (14) having a width up to some extend may form an elastomeric strip (16).

According to the présent invention;

Topsheet (6), is placed on the top of the absorbent article (1) as the interior side of 5 the article, that can be formed of spun bonded or melt blown nonwoven structure.

In the présent invention, topsheet (6) is formed of a liquid permeable spunbonded nonwoven web structure (20). The function of said topsheet (6) is taking the body exudates through the bottom layers.

In the présent invention, the acquisition distribution layer (8) (ADL) is positioned îo between the topsheet (6) and the absorbent core (10). The function of the acquisition distribution layer (8) is taking the body fluid and distributing it through the absorbent core (10) to spread it proportionally. In the présent invention the ADL (8) is formed from spun bonded NW web structure.

In the présent invention, the absorbent core (10) is placed between the backsheet 15 (12) and the acquisition distribution layer (8) or topsheet (6). The function of said absorbent core (10) is to absorb and retain the exudates of the body for a prolonged amount of time. For example; to minimize re-wet to keep the wearer dry and avoid soiling of clothes or bed sheets overnight.

In the présent invention, absorbent article (1) comprises any known absorbent 20 material such as; a blend of wood pulp such as, cellulose with superabsorbent polymers (SAP) in particulate form, also called absorbent gelling materials. The absorbent core (10) layer may comprise both of them or the absorbent core may only comprise SAP as absorbent materials to hâve a thinner nature in unloaded state.

In the présent invention, the absorbent article (1) has an absorbent core (10) 25 comprising an absorbent material such as; SAP and/or cellulose.

In the présent invention the backsheet (12) is located under the absorbent core (10).

Said backsheet (12) of the présent invention is formed of any known conventional structure that, comprising at least two layers. One of these two layers is formed of nonwoven (NW) web structure (20) and the other one is formed of a polymeric film 30 layer (18).

In the présent invention, the backsheet may comprise more than one layer of polymeric film layer (18).

In the présent invention, the backsheet may comprise more than one layer of nonwoven web layer (20)

The backsheet (12) of the présent invention is of liquid impervious nature. The function of said backsheet (12) is, to prevent body and clothes of the wearer from exudates by retaining the liquid or feces inside the absorbent article (1).

Nonwoven web layer used herein may be a manufactured web sheet, formed by directionally or randomly orientated fibers, bonded by spun bonding or melt blown bonding methods. The fibers may be of natural or man-made nature and may be staple or continuous filaments. Commercially available fibers can be used as NW web fiber. The fibers corne in several different forms such as short fibers as; staple, or chopped; continuous single fibers as filaments or monofilaments.

Nonwoven web layer (20) of the présent invention can be formed by any known process such as meltblowing, spunbonding, solvent spinning, electrospinning, carding and airlaying. The basis weight of nonwoven webs used in the présent invention differs for topsheet (6), ADL (8) or backsheet (12).

Polymeric film layer (18) used in the disclosure means; a film layer of a polymeric material. Polymeric film (18) used in backsheet (12) of the absorbent article (1) can be any known polymeric material such as; polypropylene, polyethylene or mixtures thereof.

In the state of the art, a polymeric film is laminated to a nonwoven web to form a backsheet (12) and prevents liquid leakage from the absorbent article (1).

Any known backsheet formation process can be applied in the présent invention. The backsheet formed in the présent invention has substantially non-elastic nature.

In the présent invention, at least one elastomeric strand (14) and/or strip (16) is attached on/in the backsheet in extended form such that; when in relaxed state, said elastomeric strand (14) and/or strip (16) reduces the length of the absorbent article (1) in some extent.

The elastomeric strand(s) (14) or strip(s) (16) material may be chosen from elastic materials which can comprise elastomeric polymers such as block copolymers comprising SBS and/or SEBS, styrene block copolymers, polyesters, polyuréthanes, polyethers and polyether block copolymers, latex, rubber based polymers or combinations thereof. In the présent invention polyuréthane or rubber based polymers are preferred as elastomeric strand (14) or strip (16) material, more preferably polyuréthane is used.

According to the présent invention the elastomeric strand(s) (14) and/or strip(s) (16) is attached on the backsheet localized substantially in the range of the absorbent core (10) which prevents sagging of the absorbent article (1). The elastomeric strand(s) (14) and/or strip(s) (16) may be symmetrically oriented in the core width (W) range.

The details of the présent invention is given further as following embodiments.

In one embodiment, the backsheet (12) of the présent invention is formed by laminating the polymer film layer (18) and NW web layer (20) together. Before or after lamination of these two layers, one or more elastomeric strands (14) and/or strips (16) are attached on polymeric film layer (18). Said polymeric film layer (18) and NW web layer (20) form interior surface and exterior surface of the backsheet (12).

In one embodiment the polymeric film layer (18) forms the interior surface of the backsheet (12) which is directly in contact with the absorbent core (10). Said polymeric film layer (18) has two surfaces; the interior surface is attached to absorbent core (10) of the absorbent article and the exterior surface is attached to the NW web layer (20).

In another embodiment, the nonwoven web layer (20) forms the exterior face of the backsheet (12) which is directly in contact with the garment of the wearer. Said NW web layer (20) has two surfaces. The interior surface of said NW web layer (20) is attached to the exterior surface of the polymeric film layer (18) and the exterior surface of said NW web layer (20) is directly in contact with the garment of the user and with the legs of the wearer.

In one embodiment, the elastomeric strand(s) (14) and/or strip(s) (16) can be inclosed in the polymeric film layer (18) or attached on any surface of the polymeric film layer (18) of the backsheet (12). The elastomeric strand(s) (14) may be bonded on the interior surface and/or the exterior surface of the polymeric film layer (18).

According to the présent invention the elastomeric strand(s) (14) is preferably attached on the interior surface of the polymeric film layer (18).

By attachment of the elastomeric strand(s) (14) and/or strip(s) (16) on the exterior surface of the polymeric film layer (18), the shape of the backsheet (12) may seem over crimpled. Furthermore, the elastomeric strip(s) (16) can not be attached robust and as a conséquence, the elastomeric strand(s) (14) can be detached from the backsheet surface. Therefore, the elastomeric strand(s) is preferably attached on the interior surface of the polymeric film layer (18) in the présent invention.

In one embodiment, the elastomeric strand(s) (14) and/or strip(s) (16) is stretched to some extent before attaching on the backsheet (12), in fiat position. Afterwards, they are attached on the backsheet (12), preferably on the polymeric film layer surface (18). The elastomeric strand(s) (14) is extended up to some extend to obtain an absorbent article having crinkled backsheet at the crotch région in relaxed state of the absorbent article.

In one embodiment, the extended form of the elastomeric strand(s) (14) and/or strip(s) (16) is attached in/on polymeric film layer (18) and/or the nonwoven web layer (20) of the backsheet (12) in longitudinal and/or substantially curved longitudinal structure.

In the présent invention, the elastomeric strand(s) (14) and/or strip(s) (16) is stretched to an extend as such; enabling up to 50 % stretch in longitudinal direction of the absorbent article (1).

According to the présent invention, the elastomeric strand(s) (14) may be extended, exemplarily for polyuréthane based elastomeric strands with diameter of around 500 micron, up to 300 % of its original length, preferably 250 %, more preferably 200 % of its original length to provide up to 50 % of stretch in longitudinal direction of the 5 absorbent article (1).

In one embodiment, the extended form of the elastomeric strand(s) (14) and/or strip(s) (16) is attached in/on polymeric film layer (18) of the backsheet (12), preferably attached on polymeric film layer (18).

In another embodiment, the elastomeric strand(s) (14) and/or strip(s) (16) is localized îo preferably, substantially in the range of absorbent core(10) of the absorbent article (1). Whereas, the length of the elastomeric strand(s) (14) and/or strip(s) (16) may be longer than the absorbent core length in longitudinal axis (X).

According to the présent invention, the length of said elastomeric strand(s) (14) and/or strip(s) (16) extends between 5 to 95 %, preferably between 20 to 70 % of the 15 length (L) in longitudinal axis of the absorbent article (1).

In another embodiment, the elastomeric strand (14) and/or strip (16) forms channel like structures on the backsheet (12) by lying under the absorbent core (10) of the absorbent article (1).

The channels can be formed by at least one elastomeric strand (14) and/or at least 20 one elastomeric strip (16). Said elastomeric strip (16) may be formed by at least one strand (14) or by a plurality of elastomeric strands (14). These formed channels are permanent which means that; the integrity of the channels are maintained both in dry state and wet state.

In one embodiment, backsheet (12) may be crinkled when the absorbent article (1) is 25 in use. Said backsheet is formed by attaching at least one stretched elastomeric strand (14) and/or strip (16) when the article is in fiat position.

The term bonded or attached, used herein, expresses configurations whereby an element is directly joined to another element by affixing the element directly to the other element, and configurations whereby an element is indirectly joined to another 30 element by affixing the element to intermediate member(s) which in turn are affixed to the other element.

The term “stretched or extended” used herein, refers to the length of the material as increased or extended with regard to the original length.

The term used as “original length” refers to the length of the material in non-stretched 35 state or non crimpled state.

The term elastic or elastomeric polymer refers to a material stretchable up to 300 % or more of its original length under stress, and can return to its original length when the applied stretching force is removed.

The term substantially refers to a large extent.

According to the présent invention, the backsheet (12) of the absorbent article (1) comprises one or more elastomeric strand (14) and/or, one or more elastomeric strip (16).

Elastomeric strip(s) (16) consist of one or a plurality of elastomeric strand(s) (14).

In one embodiment, the backsheet(12) comprises at least one elastomeric strip (16) comprising at least one elastomeric strand (14). Said elastomeric strip(s) has a width (W) and a length (L).

According to the présent invention, the elastomeric strip (16) has a width (W) that is formed of at least one elastomeric strand (14).

In one embodiment, the backsheet (12) of the absorbent article (1) may comprise one elastomeric strip consists of one elastomeric strand (14) or, at least two elastomeric strips (16) consist of one elastomeric strand (14) respectively.

In another embodiment, the backsheet (12) of the absorbent article (1) may comprise one elastomeric strip (16) consists of ai least two elastomeric strands (14) or, at least two elastomeric strips (16) consist of at least two elastomeric strands (14) respectively.

In one embodiment, one or more of elastomeric strand (14) and/or strip (16) bonded on the polymeric film layer (18), which is made from polyuréthane and/or its mixture with latex and/or rubber based polymers.

According to the présent invention; said elastomeric strand(s) (14) and/or strip(s) (16) is preferably made from polyuréthane.

According to the présent invention; the diameter of said single polyuréthane elastomeric strand (14) is between preferably 200 to 800 micron, more preferably between 400 to 600 micron.

According to the présent invention, the distance between two elastomeric strips (16) is at least 5 mm, more preferably 10 mm. Whereas, the distance (B) between two elastomeric strips (16) is measured as; between the outer elastomeric strands (16) of each elastomeric strip (14) that facing each other.

According to the présent invention, said at least two strips are located preferably centrally with regard to the width (W) of the absorbent core (10).

According to the présent invention; the width (W) of said elastomeric strips (16) comprising at least one elastomeric strand (14) is at most 80 % of the width (W) of the absorbent core (10), preferably at most 40 %, more preferably at most 20 % of the width (W) of the absorbent core (10).

According to the présent invention; the channels, formed by elastomeric strands (14) and/or strips (16) on backsheet (12) of the article, are permanent.

“Permanent” used herein means that, the channel structures are maintained in the same structure without deforming the absorbent article (1) in both dry state and wet state.

According to the présent invention; elastomeric strand(s) (14) and/or strips (16) are localized substantially under the absorbent core (10) and attached on the backsheet îo (12), to form channel like structures.

In dry state of the absorbent article (1), formed channels holds the absorbent article (1) and provides comfort for the wearer. Attached elastomeric strand(s) (14) and/or strip(s) (16) crinkles the backsheet (12) structure which helps to fit the article to the body of the wearer.

In wet state of the absorbent article (1), formed channels holds the absorbent article (1) which is filled up with body exudates. Furthermore, it provides fit shape structure on user’s buttocks and prevents leakage of the body fluids or feces.

Particularly in the présent invention, the channels are résistant to friction forces and movements of the wearer. The channels do not burst by harsh movements of users.

In one embodiment, the permanent channels are obtained by attaching elastomeric strand(s) (14) or strip(s) (16) on interior face of the backsheet (12) as polymeric film layer (18) followed by laminating the polymeric film layer (18) on to the nonwoven web layer (20).

In one embodiment, the polymeric film layer (18) is laminated on to the nonwoven 25 web layer (20), followed by attaching the elastomeric strand(s) (14) and/or strip(s) (16) on the interior surface of the polymeric film layer (18) which is body facing side.

In another embodiment, the elastomeric strand(s) (14) and/or strip(s) (16) is attached on the exterior surface of the polymeric film layer (18) which is garment facing side, followed by lamination to the nonwoven web layer (20).

According to the présent invention, one or more of elastomeric strand(s) (14) and/or strip(s) (16) is bonded preferably on the interior side of the polymeric film layer (18).

In one embodiment, the elastomeric strand(s) (14) and/or strip(s) (16) is attached on the polymeric film layer (18), by applying a thermoplastic adhesive material wherein used thermoplastic adhesive is preferably hot melt adhesive.

In one embodiment said hot melt adhesive can be applied by extruding, rolling or spraying on the surface of the elastomeric strand(s) (14) and/or strip(s) (16).

Hot melt adhesive used in the présent invention can be chosen from; hydrocarbon, polyolefin, resin or rubber based polymers. Polyolefin based polymers such as; polyethylene, polypropylene, polybutene-1, oxidized polyethylene, polyisoprene or polybutadiene may be in form of block copolymers including A-B-A triblock structures, A-B diblock structures and (A-B)n radial block copolymer structures may be used. Rubber based polymers such as; Styrene block copolymers (SBC), also called styrene copolymer adhesives and rubber-based adhesives which hâve good low-temperature flexibility, high élongation, and high heat résistance can be used. Said rubber based polymers usually hâve A-B-A structure, with an elastic rubber segment between two rigid plastic endblocks such as; Styrene-butadiene-styrene (SBS), Styrene-isoprene-styrene (SIS), Styrene-ethylene/butylene-styrene (SEBS) or Styrene-ethylene/propylene (SEP).

According to the présent invention; preferred holt melt adhesive is rubber based hot melt adhesive such as styrene-rubber-copolymer.

According to the présent invention, an absorbent article is manufactired with a process comprising the steps;

i) Stretching one or more elastomeric strand(s) (14) up to an extend, to provide up to 50 % of stretch in length (L) in longitudinal direction of the absorbent article, il) Attaching the stretched elastomeric strand(s) (14) on the interior or exterior surface of the polymeric film layer (18) of the backsheet (12) by using hot melt adhesive, iii) Laying said backsheet (12) having attached elastomeric strands (14), in stretched form in fiat position as bottom layer, iv) Attaching the absorbent core (10) on the backsheet (12),

v) Laying the topsheet (6) on the absorbent core (10) and backsheet (12) to cover the surface and form the absorbent article (1 )

The production of the absorbent article (1) having elastomeric strand(s) (14) and/or strip(s) (16) is disclosed in Examples with further details below.

EXAMPLE 1 : Production Of The Absorbent Article (1) Of The Présent Invention

The absorbent article (1) of the présent invention, having elastomeric strand(s) (14) and/or strip(s) (16), can be manufactured by the following steps;

- Laminating the polymeric film layer (18) and the nonwoven web layer (20) together to form the backsheet (12),

- Stretching one or more elastomeric strand(s) (14) up to 300 % of its original length wherein, stretched form of elastomeric strand(s) (14) enables up to 50 % stretch in length (L) in longitudinal direction of the absorbent article (1 ) to reach original length of said absorbent article,

- Attaching the stretched elastomeric strand(s) (14) on the interior surface of the polymeric film layer (18) of the backsheet (12) in the absorbent core région by using hot melt adhesive,

- Laying said backsheet (12) with attached elastomeric strands (14), in stretched form in fiat position as bottom layer,

- Laying absorbent core (10) on the backsheet (12),

- Laying ADL (8) on the absorbent core (10),

- Laying the topsheet (6) on the ADL (8) and backsheet (12) to cover the surface and form the absorbent article (1).

EXAMPLE 2: Production Of The Absorbent Article (1) Of The Présent Invention

The absorbent article (1) of the présent invention, having elastomeric strand(s) (14) and/or strip(s) (16), can be manufactured by the following steps;

- Stretching one or more elastomeric strand(s) (14) up to 300 % of its original length wherein, stretched form of elastomeric strand(s) (14) enables up to 50 % stretch in length (L) in longitudinal direction of the absorbent article (1) to reach original length of said absorbent article,

- Attaching the stretched elastomeric strand(s) (14) on the exterior surface of the polymeric film layer (18) of the backsheet (12) in the absorbent core région, by using hot melt adhesive,

- Laminating the polymeric film layer (18) and the nonwoven web layer (20) together to form the backsheet (12),

- Laying said backsheet (12) with attached elastomeric strands (14), in stretched form in fiat position as bottom layer,

- Laying the absorbent core (10) on the backsheet (12),

- Laying ADL (8) on the absorbent core (10),

- Laying the topsheet (6) on the ADL (8) and backsheet (12) to cover the surface and form the absorbent article (1).

The production of the absorbent article (1) having elastomeric strand(s) (14) and/or strip(s) (16) in the présent invention is further disclosed in the following Example 3. The example is given for illustrative purposes and should not limit the scope of the invention.

EXAMPLE 3: Production Of The Absorbent Article (1) Of The Présent Invention

The absorbent article (1) of the présent invention, having elastomeric strand(s) (14) and/or strip(s) (16), can be manufactured by the following steps;

- Laminating the polymeric film layer (18) made from polyethylene based polymer having a thickness of around 15 micron and the nonwoven web îo layer (20) together to form the backsheet (12) having a length of 485 mm,

- Stretching two elastomeric strips (16) having two elastomeric strands (14) each, up to 200 % of its original length and hot melt adhesive is applied on to said elastomeric strand(s) (14), wherein each elastomeric strand is 15 made form polyuréthane based polymer having a diameter of 500 micron,

- Attaching the stretched elastomeric strand(s) (14) on the interior surface of the polymeric film layer (18) of the backsheet (12) centrally located in the absorbent core région wherein, the distance between two strands is 3 mm 20 and the distance between two strips is 30 mm by a width of absorbent core of 90 mm,

- Laying said backsheet (12) with attached elastomeric strands (14), in stretched form in fiat position as bottom layer, 25

- Laying the absorbent core (10) on the backsheet (12),

- Laying ADL (8) on the absorbent core (10),

- Laying the topsheet (6) on the ADL (8) and backsheet (12) to cover the surface and form the absorbent article (1),

- Releasing the applied stretch on the absorbent article to obtain a crimpled structure of said absorbent article, 35

- In this way obtained absorbent article has a length of 390 mm,

- Accordingly, a 20 % réduction of the length of the absorbent article is achieved,

Whereas, a test method for measurement of the reduced length is applied that is specified in the présent application below.

According to the présent invention, the adhesives may be used for imprégnation of elastomeric strand (14) on the polymeric film layer (18).

Using adhesive for bonding of elastomeric strand (14) on the polymeric film layer (18) is a preferred method in the présent invention. But also, other known methods, for example ultrasonic or heat bonding may be applied.

The présent invention provides an absorbent article (1) for personal hygiene as indicated in the claims. The absorbent article (1) has a front edge and a back edge, a longitudinal axis extending in longitudinal direction and a latéral axis extending in latéral direction of the absorbent article.

In one embodiment, the elastomeric strand(s) (14) and/or strip(s) (16) may be bonded on backsheet (12) in longitudinal axis (X) or in substantially curved form in the longitudinal axis(X), when the absorbent article (1) is in fiat position. The preferred attachment direction is in longitudinal (X) axis.

In the présent invention, it is preferred to attach the elastomeric strand(s) (14) and/or strip(s) (16) on backsheet (12) in longitudinal axis (X), which provides channel like structure on absorbent core (10) and best fit shape to the user as shown in Figs 1 -8.

In the présent invention, the elastomeric strand(s) (14) and/or strip(s) (16) can be attached on the backsheet (12) in substantially curved longitudinal axis (X), which can also provide channel like structure on absorbent core (10) and best fit shape to the user.

In the présent invention, when in relaxed state, said elastomeric strand(s) (14) and/or strip(s) (16) on backsheet (12) in longitudinal axis (X) reduces the length of said absorbent article (1) by crinkling the backsheet structure as shown in Fig. 9b.

In the présent invention, said elastomeric strip(s) (16) is attached on/in said polymeric film layer (18) of the backsheet (12) in longitudinal axis (X) in stretched form to provide up to 50 % stretch in longitudinal direction of the absorbent article (1) to reach original length of said absorbent article (1) by stretching.

Test Method for Measuring The Reduced Length Of The Absorbent Article:

The reduced length of the absorbent article is measured according to the method comprising the following steps;

- The leg cuffs of the reference absorbent article without elastomeric strand(s) (14) and/or strip(s) (16), are eut and removed from the absorbent article,

- The reference absorbent article, is then put on a plane surface in fiat position,

- The length of the reference absorbent article is measured by using a ruler,

- Providing an absorbent article of the présent invention with elastomeric strand(s) (14) and/or strip(s) (16) having a backsheet, having same original length with the reference absorbent article,

- The leg cuffs of the absorbent article of the présent invention, are eut and removed from the absorbent article,

- The remaining absorbent article of the présent invention is put on a plane surface in fiat position,

- The length of the absorbent article of the présent invention is measured by using a ruler and,

- The length différence between the reference absorbent article and the absorbent article of the présent invention is calculated.

According to présent above described in-house test method, the reduced amount of the length of the absorbent article (1) is calculated. Stretching elastomeric strand(s) (14), reduces the length of the absorbent article in some extent.

According to the présent invention the stretching amount of the elastomeric strand(s) enables, up to 50 % stretch in longitudinal direction of the absorbent article (1) to reach original length of said absorbent article (1) according to the given in-house test method.

In the présent invention, the backsheet (12) of the absorbent article (1) comprises elastomeric strand(s) (14) and/or strip(s) (16) in its longitudinal axis (X). The length (L) of the elastomeric strand(s) and/or strip(s) comprise at least 5 % of the longitudinal length of the absorbent article(1), and at most 95 % of the longitudinal length of the absorbent article( 1 ).

In the présent invention, the elastomeric strand(s) (14) and/or strip(s) (16) that attached on the backsheet (12) forms at least two channels which are at least partially oriented in the longitudinal direction of the absorbent article.

The lenghth of said elastomeric strand(s) (14) and/or strip(s) (16) lying in the longitudinal axis of the absorbent article (1) is between 5 to 95 % of the longitudinal length (L) of the absorbent article (1), preferably between 20 to 70 % of the longitudinal length of the absorbent article.

In the présent invention, the preferred maximum length of the elastomeric strand(s) (14) and/or strip(s) (16) lying in the longitudinal axis is at most 70 % of the longitudinal length of the absorbent article, since the backsheet loose its crinkled shape when the length of the elastomeric strand (14) and/or strip is more than 70 % of the longitudinal length of the absorbent article.

In the présent invention, the preferred minimum length of the elastomeric strand(s) (14) and/or strip(s) (16) lying in the longitudinal axis is at least 20 % of the longitudinal length of the absorbent article, since it is not effective to prevent sagging problem below said value.

Claims (5)

1- An absorbent article (1) having longitudinal axis (X) and latéral axis (Y) comprising, a backsheet (12), a topsheet (6) and an absorbent core (10) layered between the topsheet (6) and the backsheet (12), wherein said backsheet (12) comprises;

i) a polymeric film layer (18) as the interior face of the backsheet (12) and, ii) a nonwoven web layer (20) as the exterior face of the backsheet (12), wherein;

said polymeric film layer (18) having;

- an interior surface, that is in contact with the absorbent core (10) and an exterior surface, that is in contact with the nonwoven web layer (20) and, said nonwoven web layer (20) having;

- an interior surface, that is in contact with said polymeric film layer (18) and an exterior surface, that is in contact with the garment of the wearer, characterized in that;

said backsheet comprises; at least one elastomeric strip (16) having a width (W) and a length (L) comprising at least one elastomeric strand (14) wherein, said elastomeric strip(s) (16) is localized substantially in the range of absorbent core (10) wherein, said elastomeric strip(s) (16) is attached on/in said backsheet (12) in longitudinal axis (X), in stretched form, such that; when in relaxed state, said elastomeric strip(s) (16) reduces the length of said absorbent article (1).

2- An absorbent article (1 ) according to claim 1, wherein said elastomeric strip(s) (16) is attached on/in the polymeric film layer (18), preferably on the interior surface or the exterior surface of said polymeric film layer (18), more preferably on the interior surface of the polymeric film layer (18).

3- An absorbent article (1) according to claim 2, wherein, said elastomeric strip(s) (16) is attached on/in said polymeric film layer (18) of the backsheet (12) in longitudinal axis (X) in stretched form enabling up to 50 % stretch in longitudinal direction of the length (L) of said absorbent article (1).

4- An absorbent article (1) comprising elastomeric strip(s) (16) according to claim 1, wherein the length of said elastomeric strip(s) (16) extends between 5 to 95 %, preferably between 20 to 70 % of the length (L) of the absorbent article (1 ).

5- An absorbent article (1) comprising elastomeric strips (16) according to claim 1, wherein the distance between two elastomeric strips (16) (B), is at least 5 mm, preferably at least 10 mm.

6« An absorbent article comprising elastomeric strip(s) (16) having a width (W) according to claim 1, wherein the width (W) of said elastomeric strip is at most 80 % of the width (W) of the absorbent core (10), preferably at most 40 %, more preferably at most 20 % of the width (W) of the absorbent core (10).

7- An absorbent article (1) comprising elastomeric strand (14) according to claim 1, wherein said elastomeric strand (14) is formed of an elastic material comprising styrene block copolymers, polyesters, polyuréthanes, polyethers and polyether block copolymers, latex, rubber based polymers or mixtures thereof, preferably polyuréthane.

8~ An absorbent article (1) comprising elastomeric strand(s) (14) formed of polyuréthane according to claim 7, wherein the diameter of said polyuréthane elastomeric strand (14) is between 200 to 800 micron, preferably between 400 to 600 micron.

9“ An absorbent article (1) comprising elastomeric strand(s) (14) according to claim 1, wherein said elastomeric strand(s) (16) is attached on the backsheet (12) with a hot melt adhesive.

10”An absorbent article (1) comprising elastomeric strip(s) (16) comprising elastomeric strand(s) (14) according to claim 1, wherein the backsheet (12) comprises preferably two elastomeric strips (16) located centrally in the absorbent core width range, comprising at least one elastomeric strand (14).

11-A process of manufacturing of absorbent article (1) according to claim 1, comprising the steps;

vi) Stretching one or more elastomeric strand(s) (14) in an amount, to provide up to 50 % of stretch in longitudinal direction of the length (L) of the absorbent article (1).

vii) attaching the stretched elastomeric strand(s) (14) on the interior or exterior surface of the polymeric film layer (18) of the backsheet (12) by using hot melt adhesive, viii) laying said backsheet (12) with attached elastomeric strands (14), in stretched form in fiat position as bottom layer, ix) attaching absorbent core (10) on the backsheet (12),

x) laying topsheet (6) on the absorbent core (10) and backsheet (12) to cover the surface and form the absorbent article (1 )

5 12”An absorbent article (1) according to preceding claims wherein, said absorbent article (1) is used as disposable or wearable article comprising baby diapers, incontinence diapers, pants or pull ups.