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WO2019231409A1 - Absorbent articles having anti-sagging property via specific incorporation of elastomeric features on the designed crotch region - Google Patents

Absorbent articles having anti-sagging property via specific incorporation of elastomeric features on the designed crotch region Download PDF

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Publication number
WO2019231409A1
WO2019231409A1 PCT/TR2018/050267 TR2018050267W WO2019231409A1 WO 2019231409 A1 WO2019231409 A1 WO 2019231409A1 TR 2018050267 W TR2018050267 W TR 2018050267W WO 2019231409 A1 WO2019231409 A1 WO 2019231409A1
Authority
WO
WIPO (PCT)
Prior art keywords
absorbent article
elastomeric
backsheet
absorbent
strip
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/TR2018/050267
Other languages
French (fr)
Inventor
Fikret Koc
Arzu KARATEKIN
Haluk Ozgur Acar
Arif Akaytay
Ilke SIMSEK TURAN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HAYAT KIMYA SANAYI AS
Original Assignee
HAYAT KIMYA SANAYI AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by HAYAT KIMYA SANAYI AS filed Critical HAYAT KIMYA SANAYI AS
Priority to PCT/TR2018/050267 priority Critical patent/WO2019231409A1/en
Publication of WO2019231409A1 publication Critical patent/WO2019231409A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape specially adapted to be worn around the waist, e.g. diapers, nappies
    • A61F13/49007—Form-fitting, self-adjusting disposable diapers
    • A61F13/49009—Form-fitting, self-adjusting disposable diapers with elastic means
    • A61F13/49017—Form-fitting, self-adjusting disposable diapers with elastic means the elastic means being located at the crotch region
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers of the pads
    • A61F13/514—Backsheet, i.e. the impermeable cover or layer furthest from the skin
    • A61F13/51456—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by its properties
    • A61F13/51464—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by its properties being stretchable or elastomeric
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers of the pads
    • A61F13/514—Backsheet, i.e. the impermeable cover or layer furthest from the skin
    • A61F13/51474—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by its structure
    • A61F13/51478—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by its structure being a laminate, e.g. multi-layered or with several layers
    • A61F13/5148—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by its structure being a laminate, e.g. multi-layered or with several layers having an impervious inner layer and a cloth-like outer layer

Definitions

  • ABSORBENT ARTICLES HAVING ANTI-SAGGING PROPERTY VIA SPECIFIC INCORPORATION OF ELASTOMERIC FEATURES ON THE DESIGNED CROTCH
  • the present invention relates to disposable or wearable absorbent articles such as; but not limited to, baby diapers, incontinence diapers, pants, pull up diapers, adult incontinence articles, which provide dynamic and sustained fit shape structure and anti-sagging property to absorbent articles by attaching at least one elastomeric strand and/or strip on/in the backsheet.
  • Disposable diapers have wide product spectrum which are concentrated on the similar purposes like enhanced fit, comfort and/or minimized leakage.
  • various structural features have been developed and incorporated into diapers accordingly.
  • US2014163503 describes a disposable absorbent article comprising at least two channel forming areas formed by attaching the upper and bottom sides of an absorbent core wrap together with the help of an adhesive. Channel forming areas are free of absorbent particle and the absorbent core is free of cellulose fibers. When the article becomes wet the channels are formed in the crotch region. The absorbent article seems to be a traditional article when it is dry but the channels become obvious when the article is loaded with the body exudates. The swelled channels formed are not robust therefore not permenant. When the user sits down on his/her buttocks roughly, the channels can be deformed by bursting of the channels from their adhesive applied parts. Additionally, the absorbent core which is free of cellulosic fibers brings about a softness problem for users, especially for babies.
  • Absorbent articles are desired to be flexible in the crotch region which will provide free movement of user.
  • the benefits of the flexible crotch region are; improved freedom of movement for the wearer especially when the user's legs compress the crotch region of the absorbent article and/or improved performance of absorbent structure during use, despite the fact that, highly flexible products may generally have poor resiliency when becoming wet and thus tend to lose their shape while in use.
  • the crotch region is compressed by the movement of the wearer's legs especially of babies and thus, the shape of the absorbent article becomes deformed. As the absorbent core is deformed, the product may fail performing properly which increases the likelihood of failure such as fluid leakages.
  • the design of the disposable or wearable absorbent article is shaped to fit the body structure while being worn.
  • the form of the crotch area is shaped by taking the body shape of the wearers into consideration.
  • the dynamic/sustained fit and reduced sag/gap of the absorbent articles are interrelated with each other and that can be achieved by uniquely designed crotch area.
  • It is further object of the present invention is to provide disposable or wearable absorbent articles providing dynamic/sustained fit and reduced sagging/gapping by reducing the impact of forces exerted by user’s motions. It is an object of the present invention to provide disposable or wearable absorbent articles having elastomeric features spreading continuously across the absorbent core.
  • the present invention provides an absorbent article for personal hygiene as indicated in the following embodiments.
  • the present invention describes an absorbent article such as disposable or wearable absorbent article comprising; a chassis including a topsheet, a backsheet, an absorbent core located between said topsheet and backsheet and a liquid acquisition distribution layer located preferably between said topsheet and absorbent core.
  • the present invention provides disposable or wearable absorbent articles having elastomeric features attached on the backsheet localized substantially in the range of the absorbent core which prevents sagging of the absorbent article.
  • the present invention provides elastomeric features which spread continuously across the absorbent core. These are arranged as extending rearwardly from the front part of the absorbent core as long enough in the back part to fit over the buttock and also, fit in the leg creases of the wearer to define a narrow crotch.
  • the arrangement of elastics in this manner ensures more coverage over the buttock that is desired to provide comfort and security.
  • This structure improves the freedom of movement for the wearer as a result of ensuring underwear like comfort and/or improves the performance of absorbent structure during use as a result of sustained shape of absorbent article between standing and sitting positions.
  • the absorbent core is formed from absorbent material to absorb the body exudates.
  • the majority of the core’s storage capacity lies in the rear and the center panel that brings a negative impact on the sagging/gapping of the absorbent article. Because of that it is desirable to allocate the elastomeric features around these force zones. Therefore, the elastomeric features are distributed around the force zones providing core’s storage capacity to prevent sagging/gapping.
  • the elastomeric features located too close to the leg openings increase the tension around the legs and leads to rashes. Additionally, this may lead to narrowing of the front and back panels adjacent to the crotch part which comprimises buttock coverage and causing leakage problems.
  • the elastomeric features can be symmetrically oriented within the core width (W) range.
  • the ratio of the length of elastomeric freatures to the length of absorbent article should be within a desirable range to prevent sagging of the absorbent article.
  • said elastomeric features should be localized in the range of absorbent core.
  • the elastomeric features of the present invention are arranged according to the elastomeric feature length/ absorbent article length core length ratio to strengthen the gripping power of these strands. This arrangement improves the dynamic and sustained fit of the absorbent article as well as allows comfort and the freedom of movement for the user.
  • the low ratio of elastomeric feature length / absorbent article length means that elatomeric features cover small area in the core which can not sustain the shape of the article and lead to sagging and leakage of body exudates.
  • the high ratio of elastomeric feature length / absorbent article length means that elastomeric features apply too much tension near the belt area and pulls the belt down compromising fit and causing discomfort.
  • the elastic force of elastomeric fearures is critical to keep the integrity and shape of the absorbent atticle between standing and sitting positions to prevent sagging/gapping and leakage problems.
  • Elastomeric features imparting too low elastic force lead to sagging/gapping of the absorbent article and thus in turn, may cause leakage of body exudates from the absorbent article.
  • elastomeric features imparting too high elastic force leads to fit of the absorbent article over the buttock very tightly which causes rashes and uncomfort of the wearer.
  • the object of the present invention is to provide disposable or wearable absorbent articles having elastomeric feature length / absorbent article length within desired range to prevent sagging/gapping of the absorbent article.
  • It is further an object of the present invention is to provide disposable or wearable absorbent articles having elastomeric features which can apply desirable elastic force when attached within the specified region of the absorbent article.
  • Fig. 1 Plan view of the layers of the absorbent article in flat position, as described in the present invention Fig.2. Top view of the absorbent article in flat position as described in the present invention
  • FIG.3 Top view of the disposable diaper in flat position, having double elastomeric strands in strip attached on backsheet as described in the present invention
  • FIG.4. Front view of the wearable pant when in use having double elastomeric strands in strip attached on backsheet as described in the present invention Fig.5.
  • pant 6 topsheet
  • elastomeric strip 18 polymeric film layer 20: nonwoven web layer X: longitudinal axis Y: lateral axis
  • A the distance between two strands
  • B the distance between two strips
  • Fig. 1 is a plan view of the exemplary diaper, in flattened state, with elastomeric strips (16) which are formed by a plurality of elastomeric strands (14) on backsheet (12) layer of the absorbent article (1).
  • Fig. 2 is a top view of exemplary diaper describing the absorbent core (10) structure of the present invention.
  • Exemplary absorbent article according to the present invention in the form of a diaper is represented in Figs.3.
  • Exemplary absorbent articles according to the present invention in the form of a pant is represented in Figs.4.
  • Fig. 5a is a plan view of the exemplary diaper, in flattened state with double elastomeric strips (16) comprising double elastomeric strands (14) in each, attached on/in the polymeric film layer (18) of the backsheet (12) wherein, the absorbent article (1) is in stretched state and the elastomeric strands are lying in straight shape.
  • Fig. 5b is a plan view of the exemplary diaper, in flattened state with double elastomeric strips (16) comprising single elastomeric strands (14) in each, attached on/in the polymeric film layer (18) of the backsheet (12) wherein, the absorbent article (1) is in relaxed state and the elastomeric strands (14) are in crinkled shape.
  • Fig.6 is the stress vs strain curve belonging to 5 repetative measurements of size 4 of absorbent article (1) of the present invention.
  • diaper and/or pant structures are shown only for illustration purpose, as the present invention may be applied for making a wide variety of absorbent articles.
  • ADL Acquisition and/or distrubition layer
  • SAP Super absorbent polymer
  • L Length W: Width
  • R Extention ratio
  • absorbent article is used herein to describe the disposable garments which can absorb and contain bodily exudates in particular urine or feces.
  • 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 state or non crimpled state.
  • the term“elastic” or“elastomeric polymer” or“elastomeric feature” or elastic feature or elastomeric material 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 terms used elastic strip/ strand or elastomeric strip/ strand are used interchangeably in the context of the present invention.
  • the present invention is related to an absorbent article (1) such as, but not limited to baby diapers, incontinence diapers, pants, pull ups, 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).
  • an absorbent article (1) such as, but not limited to baby diapers, incontinence diapers, pants, pull ups, 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 present 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 an absorbent article (1) which is not worn yet or refers to an absorbent article whic is worn by the wearer but not loaded with body liquid or feces.
  • Wet state refers to an absorbent article (1) which is in use and loaded with bodily fluids or feces.
  • the present invention relates to an absorbent article (1 ) having antisagging property in loaded and not loaded state during the use.
  • absorbent article (1) used herein refers to disposable or wearable absorbent articles (1) 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.
  • these articles comprise a topsheet (6), a backsheet (12), an absorbent core (10) and optionally an acquisition/distrubition layer (8) which may be comprised of one or more layers and typically other components, such as fastening members, cuffs and frontal tape structure.
  • Absorbent articles (1 ) for personal hygiene such as; disposable or wearable absorbent articles (1) are designed to absorb or retain body exudates, in particular urine or feces. These kinds of absorbent articles (1) can be baby diapers (2), training pants (4), pull up diapers (2), pants (4) or adult incontinence products. These absorbent articles have multiple layers having different functions.
  • the absorbent article (1 ) is known to comprise a chasis being formed by a topsheet (6), a backsheet (12) and an absorbent core (10) layered between said topsheet (6) and backsheet (12). It is also known to use acquisiton and/or distribution layer (ADL) (8) between the topsheet (6) and absorbent core (10) structure.
  • ADL acquisition layer
  • the absorbent article (1 ) in the present invention comprises a liquid permeable topsheet (6), a liquid impermeable 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 impermeable barrier leg cuffs substantially planar with the chassis of the absorbent article (1).
  • topsheet (6) is placed on the top of the absorbent article (1) that allows urine to pass through absorbent core (10) layer.
  • the topsheet (6) is layered on the interior part of the absorbent article (1) which contacts directly with the skin of the wearer.
  • Topsheet (6) materials are mostly chosen from softer nonwoven (NW) materials since the topsheet (6) is directly in touch with the skin of the wearer.
  • the acquisition distribution layer (8) (ADL) is positioned between the topsheet (6) and the absorbent core (10).
  • the ADL (8) is formed from spun bonded NW web structure.
  • the absorbent core (10) is placed between the backsheet (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. Therefore, re-wetting is minimized to keep the wearer dry and thereby soiling of clothes is avoided.
  • the absorbent core (10) structure generally requires superabsorbent polymer material and/or cellulose material in order to absorb large quantity of bodily exudates.
  • absorbent article (1 ) comprises any known absorbent material such as; a blend of wood pulp such as, cellulose with superabsorbent polymers (SAP) in particulate form, also called absorbent gelling materials.
  • SAP superabsorbent polymers
  • the absorbent core (10) layer may comprise both of them or the absorbent core (10) may only comprise SAP as absorbent material to have a thinner nature in unloaded state.
  • the absorbent article (1 ) has an absorbent core (10) comprising an absorbent material such as; SAP and/or cellulose.
  • the absorbent core (10) may be covered with core wrap made up of a nonwoven web structure.
  • the backsheet (12) is layered as the bottom layer of the absorbent article (1 ) to protect the body and the garments from the body waste.
  • the backsheet (12) of the absorbent article (1) has an interior face comprising a polymeric film layer (18); that is oriented as body facing side toward the wearer.
  • the backsheet (12) of the absorbent article (1) has an exterior face comprising NW web layer; which is directly in contact with the garment of the wearer, when the absorbent article (1 ) is being worn.
  • the backsheet (12) is located under the absorbent core (10) forming the exterior surface of the absorbent article (1) and prevents the leakage of the liquid or feces from the absorbent structure.
  • Said backsheet (12) of the present 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 layer (18).
  • the backsheet (12) may comprise more than one layer of polymeric film layer (18).
  • the backsheet(l) may comprise more than one layer of nonwoven web layer (20).
  • Nonwoven web layer (20) 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 come 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 present invention can be formed by any known process such as meltblowing, spunbonding, solvent spinning, electrospinning, carding and airlaying.
  • 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.
  • a polymeric film (18) is laminated to a nonwoven web (20) to form a backsheet (12) and prevents liquid leakage from the absorbent article (1 ).
  • the backsheet (12) of the present invention is of liquid impervious nature.
  • the function of said backsheet (12) is, to prevent soiling of body and clothes of the wearer with body exudates by retaining the liquid or feces inside the absorbent article (1).
  • the backsheet (12) formed in the present invention has substantially non-elastic nature.
  • the backsheet (12) comprises at least one strip (16) comprising at least one strand (14), attached in/on the backsheet (12).
  • the elastomeric strip (16) has a width (W) and a length (L) wherein said elastomeric strip(s) has a width (W) that is formed of at least one elastomeric strand (14).
  • the strip(s) (16) is formed by one or more strand(s) (14), coming together to form channel like structure.
  • the elastomeric strand(s) (14) is stretched longitudinally to an extend before attaching on the polymeric film layer (18).
  • the extended elastomeric strand(s) (14) and/or strip(s) (16) is attached preferably on the surface of polymeric film layer (18) of the backsheet (12) by applying adhesives.
  • the elastomeric strand(s) (14) and/or strip(s) (16) behaves like channel when the diaper is wet in use and holds the diaper up, to prevent sagging.
  • the elastomeric strand(s) (14) and/or strip(s) (16) provides a fit shape structure to absorbent article (1) when in use and also not in use.
  • At least one elastomeric strand (14) and/or strip (16) is attached on/in the backsheet (12) in longitudinal axis (X),in streched form localized substantially in the range of absorbent core (10) 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, wherein the full extension of the elastomeric strips(s) (16) corresponds to the length of absorbent article (1) length.
  • superabsorbent polymers and/or cellulose fibers can be used as absorbent core (10) material separately or in mixtures.
  • the backsheet (12) of the absorbent article (1) is elastisized with at least one strand (14) and/or strip (16) attached on/in the polymeric film layer (18) of the backsheet (12), as like having an elastisized core structure to provide fit shape structure to the body during the use of the absorbent article (1).
  • Elastomeric strip(s) (16) is attached 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).
  • elastomeric strand (14) used herein means, only one string or band formed by elastomeric polymer material.
  • elastomeric strip (16) used herein means that, one elastomeric strand (14) has a width up to some extent or more than one elastomeric strand(s) (14) come 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 extent may form an elastomeric strip (16).
  • 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.
  • 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 polymeric film layer (18) of the backsheet (12).
  • said elastomeric strand(s) (14) and/or strip(s) (16) is extended longitudinaly up to some extent before attaching on the polymeric film layer (18) of the backsheet (12) in flat position.
  • said elastomeric strand(s) (14) and/or strip(s) (16) is extended longitudinaly up to some extent 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).
  • said elastomeric strand(s) (14) and/or strip(s) (16) is extended longitudinaly up to some extent 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).
  • said elastomeric strand(s) (14) and/or strip(s) (16) have extention ratio (R) of from 30% to 70%, wherein extention ratio (R) is defined as the ratio of the length of elastic strips in relaxed state (L1) to fully extended state (L2) with absorbent article (see figures 5a and 5b).
  • the elastomeric strand(s) (14) and/or strip(s) (16) spread continuously across the absorbent core (10) and arranged as extending rearwardly from the front edge (10.3) of the absorbent core (10) as long enough in the back to fit over the buttock and also, fit in the leg creases of the wearer to define a narrow crotch.
  • Said elastomeric strand(s) (14) and/or strip(s) (16) may be symmetrically oriented in the absorbent core (10) width (W) range.
  • the elastomeric strand(s) (14) and/or strip(s) (16) are distributed around the midst of crotch region amongst the different force zones to prevent sagging/gapping and rashes.
  • the strand(s) (14) and/or strip(s) (16) are equally distanced around the central plane of the absorbent core (10).
  • the distance between two elastomeric strips (16) is at least 5 mm, preferably at least 10 mm and also, elastomeric strips (16) are located at least 5 mm inside of the absorbent core side edge (10.1).
  • the distance between outer elastomeric strand (14) and absorbent core side edge (10.1) is denoted by (Z) and determined by measuring the distance between outer elastomeric strand (14) and absorbent core side edge (10.1 ).
  • the distance (B) between two elastomeric strips (16) is determined by measuring the distance between the inner elastomeric strands (16) of each elastomeric strip (14) that facing each other.
  • the strand(s) (14) and/or strip(s) (16) can be symmetrically oriented in the core width (W) range.
  • the strand(s) (14) and/or strip(s) (16) of the present invention are arranged according to the elastomeric feature length / absorbent article length ratio to strengthen the gripping power of these strand(s) (14) and/or strips (16).
  • the elastic strand(s) (14) and/or strip(s) (16) preferably have a distance of 7 mm, more preferably 5 mm from the back edge (10.2).
  • the strand(s) (14) and/or strip(s) (16) preferably have a distance of 9 mm, more preferably 7 mm from the front edge (10.3).
  • the strand(s) (14) and/or strip(s) (16) of the present invention encompass between 20% and 80 %, preferably between 30% and 70% of of the length of the absorbent article (1 ) in extended state to ensure anti-sagging property without compromising the secure usage of wearer.
  • the elastic force of strand(s) (14) and/or strip(s) (16) is critical to keep the integrity and shape of the absorbent article (1 ) by standing and sitting positions to prevent sagging/gapping and leakage problems.
  • the elastic force applied by elastomeric features of the present invention is from 0,5N to 4,0 N, preferably from 0,7N to 3, ON at an extension of one half of extension length of absorbent article (1) and from 0,5 N to 1 ,5 N at an extension of one quarter of extension length of absorbent article (1) in order to cover the target fit range of antisagging property. Whereas the difference between extended state length of absorbent article (1) and relaxed state length of absorbent article (1 ) corresponds to the extention length (L) of the absorbent article (1 ).
  • the density of fibers in strand(s) (14) and/or strip(s) (16) is called as linear density whose commonly used unit is decitex (dtex).
  • the present invention provides strand(s) (14) and/or strip(s) (16) having linear density between 500 and 1000 dtex, preferably 600 and 850 dtex.
  • said elastomeric strand(s) (14) and/or strip(s) (16) is extended longitudinaly up to some extent before attaching in the polymeric film layer (18) of the backsheet (12) and attached adhesively or by means of ultrasonic tretatment. Said polymeric film layer (18) is further attached to the nonwoven web layer (20) of the backsheet (12) adhesively or by lamination.
  • 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, polyurethanes, polyethers and polyether block copolymers, latex, rubber based polymers or combinations thereof.
  • elastomeric polymers such as block copolymers comprising SBS and/or SEBS, styrene block copolymers, polyesters, polyurethanes, polyethers and polyether block copolymers, latex, rubber based polymers or combinations thereof.
  • polyurethane or rubber based polymers are preferred as elastomeric strand (14) or strip (16) material, more preferably polyurethane is used.
  • the backsheet (12) of the present 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 the interior of polymeric film layer (18) of the backsheet (12).
  • 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 (1) and the exterior surface is attached to the NW web layer (20).
  • 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.
  • the strand(s) (14) and/or strip(s) (16) is preferably attached on the interior 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 consequence, the elastomeric strand(s) (14) can be detached from the backsheet (12) surface. Therefore, the elastomeric strand(s) is preferably attached on the interior surface of the polymeric film layer (18) in the present invention.
  • the elastomeric strand(s) (14) and/or strip(s) (16) is extended up to some extend before attaching to obtain an absorbent article (1 ) having crinkled backsheet (12) at the crotch region in relaxed state of the absorbent article (1 ).
  • the elastomeric strand(s) (14) may be extended, exemplarily for polyurethane based elastomeric strands (14) having around 800 dtex with diameter of around 500 micron, up to 300 % of its original length, preferably 250 %, more preferably 200 % of its original length to provide an extention ratio (R) of from 30% to 70% attached on the backsheet (12) of the absorbent article (1 ) wherein the extention ratio (R) is defined as the ratio of the length of elastomeric strips (16) in relaxed state (L1) to fully extended state (L2) with absorbent article (1).
  • said elastomeric strand(s) (14) and/or strip(s) (16) is preferably made from polyurethane.
  • the diameter of said single polyurethane elastomeric strand (14) is between 200 to 800 micron, preferably between 400 to 600 micron.
  • said backsheet (12) may comprise preferablly two elastomeric strips (16) located centrally in the absorbent core (10) width range, comprising at least one elastomeric strand (14) per elastomeric strip (16).
  • elastomeric strand(s) (14) and/or strips (16) are localized substantially in the range of absorbent core (10) and attached on the polymeric film layer (18) of the backsheet (12), to form channel like structures.
  • 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.
  • 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.
  • 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.
  • thermoplastic adhesive is preferably hot melt adhesive.
  • 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 present invention can be chosen from; hydrocarbon, polyolefin, resin or rubber based polymers.
  • an absorbent article(1 ) is manufactured with a process comprising the steps; i) Stretching one or more elastomeric strand(s) (14) up to an extend, to provide an extention ratio (R) of from 30% to 70% (L1/L2) in longitudinal direction of the absorbent article (1)
  • the absorbent article (1) of the present invention having elastomeric strand(s) (14) and/or strip(s) (16), can be manufactured by the following steps;
  • the elastic force of the absorbent article (1 ) is measured according to the method comprising the following steps;
  • leg cuffs of the absorbent article (1 ) of the present invention prepared according to the example 1 are cut and removed from the absorbent article (1),
  • the remaining absorbent article(1) of the present invention is attached at front (10.3) and back edges (10.2) of the absorbent article (1 ) to the clamps of the elastic force measurement instrument.
  • the absorbent article (1) of the present invention is stretched 70mm longitudinally with a speed of 500mm/min until elastic strands (14) on the backsheet are stretched. (5 repetative mesaurements are performed for each article having different sizes)
  • the stress vs.strain curves belonging to the absorbent article (1) of the present invention is prepared. TEST RESULTS and EVALUATION
  • the elastic force of strand(s) (14) and/or strip(s) (16) is critical to keep the integrity and shape of the absorbent article (1 ) between standing and sitting positions to prevent sagging/gapping and leakage problems.
  • the elastic force applied by elastomeric features of the present invention is from 0,5 N to 4,0 N, preferably from 0,7N to 3,0 N at an extension of one half of extension length of absorbent article (1) and from 0,5 N to 1 ,5 N at an extension of one quarter of extension length of absorbent article (1) in order to cover the target fit range of antisagging property. Whereas the difference between extended state length of absorbent article (1 ) and relaxed state length of absorbent article (1) corresponds to the extention length (E) of the absorbent article (1).

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Abstract

The present invention relates to disposable or wearable absorbent articles (1) such as; but not limited to, baby diapers (2), incontinence diapers, pants (4), pull up diapers, adult incontinence articles in which elastomeric strand(s) (14) and/or strip(s) (16) imparting enough elastic force are attached in longitudinal axis of the backsheet (12) of the absorbent article (1) in stretched form to provide dynamic and sustained fit shape structure and anti-sagging property to absorbent articles (1) without compromising wearer's comfort and lekage problems.

Description

ABSORBENT ARTICLES HAVING ANTI-SAGGING PROPERTY VIA SPECIFIC INCORPORATION OF ELASTOMERIC FEATURES ON THE DESIGNED CROTCH
REGION
FIELD OF THE INVENTION
The present invention relates to disposable or wearable absorbent articles such as; but not limited to, baby diapers, incontinence diapers, pants, pull up diapers, adult incontinence articles, which provide dynamic and sustained fit shape structure and anti-sagging property to absorbent articles by attaching at least one elastomeric strand and/or strip on/in the backsheet.
BACKGROUND OF THE INVENTION
Disposable diapers have wide product spectrum which are concentrated on the similar purposes like enhanced fit, comfort and/or minimized leakage. In this regard, various structural features have been developed and incorporated into diapers accordingly.
Many of the disposable diapers on the market tend to sag/gap away from the body of the wearer during use as a result of motions of the wearer like breathing, moving or changing position. As the wearer moves, diaper is subjected to dynamic forces which cause strains especially when the diaper is loaded with bodily exudates. As the dynamic forces exerted on the disposable diaper are consolidated, these forces tend to deform the material constituting the diaper. As a result, the absorbent article tends to sag/gap away from the wearer leading to poor fit and leakage of the bodily exudates.
The dynamic fit of the absorbent article about the wearer has been provided with the incorporation of elastomeric features about the waist, hips or legs. However, these absorbent articles have the tendency to sag/gap as a result of dynamic forces exerted by movements of the wearer or they can be highly tight during use which leads to rashes and discomfort of the wearer.
Thus, it would be advantageous to provide an absorbent article having improved fit and wearer comfort as well as reduced sagging/gapping and leakage problems during use.
US2014163503 describes a disposable absorbent article comprising at least two channel forming areas formed by attaching the upper and bottom sides of an absorbent core wrap together with the help of an adhesive. Channel forming areas are free of absorbent particle and the absorbent core is free of cellulose fibers. When the article becomes wet the channels are formed in the crotch region. The absorbent article seems to be a traditional article when it is dry but the channels become obvious when the article is loaded with the body exudates. The swelled channels formed are not robust therefore not permenant. When the user sits down on his/her buttocks roughly, the channels can be deformed by bursting of the channels from their adhesive applied parts. Additionally, the absorbent core which is free of cellulosic fibers brings about a softness problem for users, especially for babies.
Moreover, there is a need to use special machine equipment to manufacture that kind of absorbent article having channels which are free of superabsorbent polymers. With traditional diaper manufacturing equipments it is not possible to obtain that kind of structure, which is in industrial applications not economically feasable. Therefore, there is a need to provide an absorbent core containing cellulosic fibers to obtain softer and fluffy products which are fitting and not leaking.
In view of the above mentioned aspects there is a need to provide disposable absorbent articles which do not display above mentioned swollen shape and sagging problem. There is a need to provide fit shape structure of absorbent articles in filled state with an economical, feasable and simple manner.
The comfort and performance of an absorbent article is mostly achieved by the performance and design of its core structure which is designed to absorb and retain the body exudates. As a result of high load of absorbent core, it becomes weighty which stretches the absorbent article downward while being used. The situation gets worse when the user compress the legs. Upon compression of the crotch portion, the absorbent article loses its shape which brings about the sagging of the absorbent article and thus in turn, leakage problems will arise.
Absorbent articles are desired to be flexible in the crotch region which will provide free movement of user. The benefits of the flexible crotch region are; improved freedom of movement for the wearer especially when the user's legs compress the crotch region of the absorbent article and/or improved performance of absorbent structure during use, despite the fact that, highly flexible products may generally have poor resiliency when becoming wet and thus tend to lose their shape while in use. The crotch region is compressed by the movement of the wearer's legs especially of babies and thus, the shape of the absorbent article becomes deformed. As the absorbent core is deformed, the product may fail performing properly which increases the likelihood of failure such as fluid leakages. The design of the disposable or wearable absorbent article is shaped to fit the body structure while being worn. The form of the crotch area is shaped by taking the body shape of the wearers into consideration. The dynamic/sustained fit and reduced sag/gap of the absorbent articles are interrelated with each other and that can be achieved by uniquely designed crotch area. Thus, it would be advantageous to provide an absorbent article having improved sustained fit as well as reduced sagging/gapping and leakage during use.
It is therefore an object of the present invention to provide greater freedom of movement of the wearer by conformably fitting the diaper to the wearer and by sustaining this fit during use. It is also an object of the present invention to provide disposable or wearable absorbent articles enabling dynamic and sustained fit through its uniquely designed crotch area.
It is further object of the present invention is to provide disposable or wearable absorbent articles providing dynamic/sustained fit and reduced sagging/gapping by reducing the impact of forces exerted by user’s motions. It is an object of the present invention to provide disposable or wearable absorbent articles having elastomeric features spreading continuously across the absorbent core.
SUMMARY OF THE INVENTION
The present invention provides an absorbent article for personal hygiene as indicated in the following embodiments. The present invention describes an absorbent article such as disposable or wearable absorbent article comprising; a chassis including a topsheet, a backsheet, an absorbent core located between said topsheet and backsheet and a liquid acquisition distribution layer located preferably between said topsheet and absorbent core.
In view of the above mentioned problems with existing absorbent articles, the present invention provides disposable or wearable absorbent articles having elastomeric features attached on the backsheet localized substantially in the range of the absorbent core which prevents sagging of the absorbent article.
The present invention provides elastomeric features which spread continuously across the absorbent core. These are arranged as extending rearwardly from the front part of the absorbent core as long enough in the back part to fit over the buttock and also, fit in the leg creases of the wearer to define a narrow crotch. The arrangement of elastics in this manner ensures more coverage over the buttock that is desired to provide comfort and security. This structure improves the freedom of movement for the wearer as a result of ensuring underwear like comfort and/or improves the performance of absorbent structure during use as a result of sustained shape of absorbent article between standing and sitting positions.
The absorbent core is formed from absorbent material to absorb the body exudates. The majority of the core’s storage capacity lies in the rear and the center panel that brings a negative impact on the sagging/gapping of the absorbent article. Because of that it is desirable to allocate the elastomeric features around these force zones. Therefore, the elastomeric features are distributed around the force zones providing core’s storage capacity to prevent sagging/gapping. The elastomeric features located too close to the leg openings increase the tension around the legs and leads to rashes. Additionally, this may lead to narrowing of the front and back panels adjacent to the crotch part which comprimises buttock coverage and causing leakage problems.
Specifically, the elastomeric features can be symmetrically oriented within the core width (W) range. The ratio of the length of elastomeric freatures to the length of absorbent article should be within a desirable range to prevent sagging of the absorbent article. Preferably, said elastomeric features should be localized in the range of absorbent core. The elastomeric features of the present invention are arranged according to the elastomeric feature length/ absorbent article length core length ratio to strengthen the gripping power of these strands. This arrangement improves the dynamic and sustained fit of the absorbent article as well as allows comfort and the freedom of movement for the user.
The low ratio of elastomeric feature length / absorbent article length means that elatomeric features cover small area in the core which can not sustain the shape of the article and lead to sagging and leakage of body exudates. The high ratio of elastomeric feature length / absorbent article length means that elastomeric features apply too much tension near the belt area and pulls the belt down compromising fit and causing discomfort.
More specifically, the elastic force of elastomeric fearures is critical to keep the integrity and shape of the absorbent atticle between standing and sitting positions to prevent sagging/gapping and leakage problems. Elastomeric features imparting too low elastic force lead to sagging/gapping of the absorbent article and thus in turn, may cause leakage of body exudates from the absorbent article. On the other hand, elastomeric features imparting too high elastic force leads to fit of the absorbent article over the buttock very tightly which causes rashes and uncomfort of the wearer.
Therefore, the object of the present invention is to provide disposable or wearable absorbent articles having elastomeric feature length / absorbent article length within desired range to prevent sagging/gapping of the absorbent article.
It is further an object of the present invention is to provide disposable or wearable absorbent articles having elastomeric features which can apply desirable elastic force when attached within the specified region of the absorbent article.
BRIEF DESCRIPTION OF DRAWINGS
Fig. 1. Plan view of the layers of the absorbent article in flat position, as described in the present invention Fig.2. Top view of the absorbent article in flat position as described in the present invention
Fig.3. Top view of the disposable diaper in flat position, having double elastomeric strands in strip attached on backsheet as described in the present invention
Fig.4. Front view of the wearable pant when in use having double elastomeric strands in strip attached on backsheet as described in the present invention Fig.5. Top view of the disposable diaper in flat position, having double elastomeric strands in strip attached on the nonwoven web layer of backsheet;
5a. in stretched state as described in the present invention
5b. in relaxed state as described in the present invention
Fig.6. Stress vs. strain curve belongs to size 4 of absorbent article (1 ) of the present invention
Wherein;
1 : absorbent article 2: diaper
4: pant 6: topsheet
8: acquisition and/or distribution layer (ADL) 10: absorbent core
10.1 : absorbent core side edge 10.2: absorbent core back edge 10.3: absorbent core front edge 12: backsheet 14: elastomeric strand
16: elastomeric strip 18: polymeric film layer 20: nonwoven web layer X: longitudinal axis Y: lateral axis
A: the distance between two strands B: the distance between two strips
D: the distance between outer elastomeric strand and absorbent core side edge
Fig. 1 is a plan view of the exemplary diaper, in flattened state, with elastomeric strips (16) which are formed by a plurality of elastomeric strands (14) on backsheet (12) layer of the absorbent article (1). Fig. 2 is a top view of exemplary diaper describing the absorbent core (10) structure of the present invention.
Exemplary absorbent article according to the present invention in the form of a diaper is represented in Figs.3. Exemplary absorbent articles according to the present invention in the form of a pant is represented in Figs.4.
Fig. 5a is a plan view of the exemplary diaper, in flattened state with double elastomeric strips (16) comprising double elastomeric strands (14) in each, attached on/in the polymeric film layer (18) of the backsheet (12) wherein, the absorbent article (1) is in stretched state and the elastomeric strands are lying in straight shape.
Fig. 5b is a plan view of the exemplary diaper, in flattened state with double elastomeric strips (16) comprising single elastomeric strands (14) in each, attached on/in the polymeric film layer (18) of the backsheet (12) wherein, the absorbent article (1) is in relaxed state and the elastomeric strands (14) are in crinkled shape. Fig.6 is the stress vs strain curve belonging to 5 repetative measurements of size 4 of absorbent article (1) of the present invention.
The shown diaper and/or pant structures are shown only for illustration purpose, as the present invention may be applied for making a wide variety of absorbent articles.
ABBREVIATIONS NW: Nonwoven
ADL: Acquisition and/or distrubition layer SAP: Super absorbent polymer L: Length W: Width R: Extention ratio
E: Extension Length DETAILED DESCRIPTION OF THE INVENTION
The term "disposable" is used to describe single use garments which are discarded not needed to be reused or laundered.
The term "absorbent article" is used herein to describe the disposable garments which can absorb and contain bodily exudates in particular urine or feces.
As used herein, the term“stretched or extended” used herein, refers to the length of the material as increased or extended with regard to the original length.
As used herein, the term used as“original length” refers to the length of the material in non- stretched state or non crimpled state. As used herein, the term“elastic” or“elastomeric polymer” or“elastomeric feature” or elastic feature or elastomeric material 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 terms used elastic strip/ strand or elastomeric strip/ strand are used interchangeably in the context of the present invention. The present invention is related to an absorbent article (1) such as, but not limited to baby diapers, incontinence diapers, pants, pull ups, 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 present 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 an absorbent article (1) which is not worn yet or refers to an absorbent article whic is worn by the wearer but not loaded with body liquid or feces.
Wet state refers to an absorbent article (1) which is in use and loaded with bodily fluids or feces. The present invention relates to an absorbent article (1 ) having antisagging property in loaded and not loaded state during the use.
The term absorbent article (1) used herein refers to disposable or wearable absorbent articles (1) 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 layer (8) which may be comprised of one or more layers and typically other components, such as fastening members, cuffs and frontal tape structure.
Absorbent articles (1 ) for personal hygiene such as; disposable or wearable absorbent articles (1) are designed to absorb or retain body exudates, in particular urine or feces. These kinds of absorbent articles (1) can be baby diapers (2), training pants (4), pull up diapers (2), pants (4) or adult incontinence products. These absorbent articles have multiple layers having different functions. Basically the absorbent article (1 ) is known to comprise a chasis being formed by a topsheet (6), a backsheet (12) and an absorbent core (10) layered between said topsheet (6) and backsheet (12). It is also known to use acquisiton and/or distribution layer (ADL) (8) between the topsheet (6) and absorbent core (10) structure.
The absorbent article (1 ) in the present invention comprises a liquid permeable topsheet (6), a liquid impermeable 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 impermeable barrier leg cuffs substantially planar with the chassis of the absorbent article (1).
In the present invention, topsheet (6) is placed on the top of the absorbent article (1) that allows urine to pass through absorbent core (10) layer. The topsheet (6) is layered on the interior part of the absorbent article (1) which contacts directly with the skin of the wearer. Topsheet (6) materials are mostly chosen from softer nonwoven (NW) materials since the topsheet (6) is directly in touch with the skin of the wearer.
In the present invention, the acquisition distribution layer (8) (ADL) is positioned between the topsheet (6) and the absorbent core (10). In the present invention the ADL (8) is formed from spun bonded NW web structure.
In the present invention, the absorbent core (10) is placed between the backsheet (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. Therefore, re-wetting is minimized to keep the wearer dry and thereby soiling of clothes is avoided. The absorbent core (10) structure generally requires superabsorbent polymer material and/or cellulose material in order to absorb large quantity of bodily exudates.
In the present invention, absorbent article (1 ) comprises any known absorbent 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 (10) may only comprise SAP as absorbent material to have a thinner nature in unloaded state.
In the present invention, the absorbent article (1 ) has an absorbent core (10) comprising an absorbent material such as; SAP and/or cellulose.
The absorbent core (10) may be covered with core wrap made up of a nonwoven web structure.
In the present invention, the backsheet (12) is layered as the bottom layer of the absorbent article (1 ) to protect the body and the garments from the body waste. The backsheet (12) of the absorbent article (1) has an interior face comprising a polymeric film layer (18); that is oriented as body facing side toward the wearer. The backsheet (12) of the absorbent article (1) has an exterior face comprising NW web layer; which is directly in contact with the garment of the wearer, when the absorbent article (1 ) is being worn.
In the present invention, the backsheet (12) is located under the absorbent core (10) forming the exterior surface of the absorbent article (1) and prevents the leakage of the liquid or feces from the absorbent structure. Said backsheet (12) of the present 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 layer (18).
In the present invention, the backsheet (12) may comprise more than one layer of polymeric film layer (18).
In the present invention, the backsheet(l) may comprise more than one layer of nonwoven web layer (20).
Nonwoven web layer (20) 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 come 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 present invention can be formed by any known process such as meltblowing, spunbonding, solvent spinning, electrospinning, carding and airlaying.
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 (18) is laminated to a nonwoven web (20) to form a backsheet (12) and prevents liquid leakage from the absorbent article (1 ).
The backsheet (12) of the present invention is of liquid impervious nature. The function of said backsheet (12) is, to prevent soiling of body and clothes of the wearer with body exudates by retaining the liquid or feces inside the absorbent article (1).
Any known backsheet (12) formation process can be applied in the present invention. The backsheet (12) formed in the present invention has substantially non-elastic nature.
The backsheet (12) comprises at least one strip (16) comprising at least one strand (14), attached in/on the backsheet (12).
According to the present invention, the elastomeric strip (16) has a width (W) and a length (L) wherein said elastomeric strip(s) has a width (W) that is formed of at least one elastomeric strand (14).
The strip(s) (16) is formed by one or more strand(s) (14), coming together to form channel like structure.
The elastomeric strand(s) (14) is stretched longitudinally to an extend before attaching on the polymeric film layer (18). The extended elastomeric strand(s) (14) and/or strip(s) (16) is attached preferably on the surface of polymeric film layer (18) of the backsheet (12) by applying adhesives. The elastomeric strand(s) (14) and/or strip(s) (16) behaves like channel when the diaper is wet in use and holds the diaper up, to prevent sagging. The elastomeric strand(s) (14) and/or strip(s) (16) provides a fit shape structure to absorbent article (1) when in use and also not in use. In the present invention, at least one elastomeric strand (14) and/or strip (16) is attached on/in the backsheet (12) in longitudinal axis (X),in streched form localized substantially in the range of absorbent core (10) 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, wherein the full extension of the elastomeric strips(s) (16) corresponds to the length of absorbent article (1) length.
The present invention is disclosed with the given non-limiting embodiments;
According to the present invention, superabsorbent polymers and/or cellulose fibers can be used as absorbent core (10) material separately or in mixtures.
According to the present invention, the backsheet (12) of the absorbent article (1) is elastisized with at least one strand (14) and/or strip (16) attached on/in the polymeric film layer (18) of the backsheet (12), as like having an elastisized core structure to provide fit shape structure to the body during the use of the absorbent article (1). Elastomeric strip(s) (16) is attached 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).
In the present invention; the term of elastomeric strand (14) used herein means, only one string or band formed by elastomeric polymer material. And the term of elastomeric strip (16) used herein means that, one elastomeric strand (14) has a width up to some extent or more than one elastomeric strand(s) (14) come 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 extent may form an elastomeric strip (16).
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 present 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 polymeric film layer (18) of the backsheet (12). In one embodiment, said elastomeric strand(s) (14) and/or strip(s) (16) is extended longitudinaly up to some extent before attaching on the polymeric film layer (18) of the backsheet (12) in flat position.
In one embodiment, said elastomeric strand(s) (14) and/or strip(s) (16) is extended longitudinaly up to some extent 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 extent 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) have extention ratio (R) of from 30% to 70%, wherein extention ratio (R) is defined as the ratio of the length of elastic strips in relaxed state (L1) to fully extended state (L2) with absorbent article (see figures 5a and 5b).
In the present invention, the elastomeric strand(s) (14) and/or strip(s) (16) spread continuously across the absorbent core (10) and arranged as extending rearwardly from the front edge (10.3) of the absorbent core (10) as long enough in the back to fit over the buttock and also, fit in the leg creases of the wearer to define a narrow crotch. Said elastomeric strand(s) (14) and/or strip(s) (16) may be symmetrically oriented in the absorbent core (10) width (W) range.
In the present invention, the elastomeric strand(s) (14) and/or strip(s) (16) are distributed around the midst of crotch region amongst the different force zones to prevent sagging/gapping and rashes. The strand(s) (14) and/or strip(s) (16) are equally distanced around the central plane of the absorbent core (10). The distance between two elastomeric strips (16) is at least 5 mm, preferably at least 10 mm and also, elastomeric strips (16) are located at least 5 mm inside of the absorbent core side edge (10.1). The distance between outer elastomeric strand (14) and absorbent core side edge (10.1) is denoted by (Z) and determined by measuring the distance between outer elastomeric strand (14) and absorbent core side edge (10.1 ). The distance (B) between two elastomeric strips (16) is determined by measuring the distance between the inner elastomeric strands (16) of each elastomeric strip (14) that facing each other.
In the present invention, the strand(s) (14) and/or strip(s) (16) can be symmetrically oriented in the core width (W) range. The strand(s) (14) and/or strip(s) (16) of the present invention are arranged according to the elastomeric feature length / absorbent article length ratio to strengthen the gripping power of these strand(s) (14) and/or strips (16). The elastic strand(s) (14) and/or strip(s) (16) preferably have a distance of 7 mm, more preferably 5 mm from the back edge (10.2). The strand(s) (14) and/or strip(s) (16) preferably have a distance of 9 mm, more preferably 7 mm from the front edge (10.3). Therefore, the strand(s) (14) and/or strip(s) (16) of the present invention encompass between 20% and 80 %, preferably between 30% and 70% of of the length of the absorbent article (1 ) in extended state to ensure anti-sagging property without compromising the secure usage of wearer.
An absorbent article (1) according to claim (1), wherein said elastic forces applied from said elastomeric strip(s)(16) are between 0,5N and 1 ,5N at an extension of one quarter of said extension length of the absorbent article (1).
In the present invention, the elastic force of strand(s) (14) and/or strip(s) (16) is critical to keep the integrity and shape of the absorbent article (1 ) by standing and sitting positions to prevent sagging/gapping and leakage problems. The elastic force applied by elastomeric features of the present invention is from 0,5N to 4,0 N, preferably from 0,7N to 3, ON at an extension of one half of extension length of absorbent article (1) and from 0,5 N to 1 ,5 N at an extension of one quarter of extension length of absorbent article (1) in order to cover the target fit range of antisagging property. Whereas the difference between extended state length of absorbent article (1) and relaxed state length of absorbent article (1 ) corresponds to the extention length (L) of the absorbent article (1 ). When the elastic force falls below 0,5 N at an extension of one quarter of extention length (L) of absorbent article (1), the product may "feel" loose, sagging occurs that leads to leakage problems. On the other hand, when the elastic force gets above the upper portion of the range of 4,0 N at an extension of one half of extended state of elastic material, the product may "feel" tight and lead to rashes and also, wearer’s discomfort.
The density of fibers in strand(s) (14) and/or strip(s) (16) is called as linear density whose commonly used unit is decitex (dtex). The present invention provides strand(s) (14) and/or strip(s) (16) having linear density between 500 and 1000 dtex, preferably 600 and 850 dtex.
In one embodiment, said elastomeric strand(s) (14) and/or strip(s) (16) is extended longitudinaly up to some extent before attaching in the polymeric film layer (18) of the backsheet (12) and attached adhesively or by means of ultrasonic tretatment. Said polymeric film layer (18) is further attached to the nonwoven web layer (20) of the backsheet (12) adhesively or by lamination. 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, polyurethanes, polyethers and polyether block copolymers, latex, rubber based polymers or combinations thereof. In the present invention polyurethane or rubber based polymers are preferred as elastomeric strand (14) or strip (16) material, more preferably polyurethane is used.
The details of the present invention is given further as following embodiments.
In one embodiment, the backsheet (12) of the present 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 the interior of polymeric film layer (18) 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 (1) 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.
According to the present, invention the strand(s) (14) and/or strip(s) (16) 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 consequence, the elastomeric strand(s) (14) can be detached from the backsheet (12) surface. Therefore, the elastomeric strand(s) is preferably attached on the interior surface of the polymeric film layer (18) in the present invention.
The elastomeric strand(s) (14) and/or strip(s) (16) is extended up to some extend before attaching to obtain an absorbent article (1 ) having crinkled backsheet (12) at the crotch region in relaxed state of the absorbent article (1 ). According to the present invention, the elastomeric strand(s) (14) may be extended, exemplarily for polyurethane based elastomeric strands (14) having around 800 dtex with diameter of around 500 micron, up to 300 % of its original length, preferably 250 %, more preferably 200 % of its original length to provide an extention ratio (R) of from 30% to 70% attached on the backsheet (12) of the absorbent article (1 ) wherein the extention ratio (R) is defined as the ratio of the length of elastomeric strips (16) in relaxed state (L1) to fully extended state (L2) with absorbent article (1).
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 polyurethane and/or its mixture with latex and/or rubber based polymers.
According to the present invention; said elastomeric strand(s) (14) and/or strip(s) (16) is preferably made from polyurethane.
According to the present invention; the diameter of said single polyurethane elastomeric strand (14) is between 200 to 800 micron, preferably between 400 to 600 micron. According to the present invention, said backsheet (12) may comprise preferablly two elastomeric strips (16) located centrally in the absorbent core (10) width range, comprising at least one elastomeric strand (14) per elastomeric strip (16).
According to the present invention; elastomeric strand(s) (14) and/or strips (16) are localized substantially in the range of absorbent core (10) and attached on the polymeric film layer (18) of the backsheet (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.
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 present invention can be chosen from; hydrocarbon, polyolefin, resin or rubber based polymers.
PREPARATION METHOD OF ABSORBENT ARTICLE
According to the present invention, an absorbent article(1 ) is manufactured with a process comprising the steps; i) Stretching one or more elastomeric strand(s) (14) up to an extend, to provide an extention ratio (R) of from 30% to 70% (L1/L2) in longitudinal direction of the absorbent article (1)
ii) 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) Laminating the nonwoven web layer (20) to the polymeric film layer (18) to form the laminate backsheet structure (12),
iv) Laying said backsheet (12) having attached elastomeric strands (14), in stretched form in flat position as bottom layer,
v) Attaching the absorbent core (10) on the backsheet (12),
vi) 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 Present Invention
The absorbent article (1) of the present invention, having elastomeric strand(s) (14) and/or strip(s) (16), can be manufactured by the following steps;
Stretching two elastomeric strips (16) having two elastomeric strands (14) each, up to 200 % of its original length, which provides a length of %55 of the absorbent article (1) (270 mm) and hot melt adhesive is applied on to said elastomeric strand(s) (14), wherein each elastomeric strand is made form polyurethane 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 region wherein, the distance between two strands is 3 mm and the distance between two strips is 30 mm by a width (W) of absorbent core of 90 mm, Laminating the polymeric film layer (18) made from polyethylene based polymer having a thickness of around 15 micron and the spunbonded nonwoven web layer (20) together to form the backsheet (12) having a length of 485 mm,
Laying said backsheet (12) with attached elastomeric strands (14), in stretched form in flat position as bottom layer,
Laying ADL (8) on the absorbent core (10),
Laying the topsheet (6) including cuffs on the ADL (8)
Laying obtained topsheet aggregate on the backsheet to cover the surface and for the absorbent article (1)
Releasing the applied stretch on the absorbent article reveal a crimpled structure of said absorbent article having a length of 390 mm,
Accordingly, a 20 % reduction of the length of the absorbent article is achieved,
MEASUREMENTS and TEST METHODS
A.Determination of Elastic Force of Elastomeric Features
The elastic force of the absorbent article (1 ) is measured according to the method comprising the following steps;
The leg cuffs of the absorbent article (1 ) of the present invention prepared according to the example 1 , are cut and removed from the absorbent article (1),
The remaining absorbent article(1) of the present invention is attached at front (10.3) and back edges (10.2) of the absorbent article (1 ) to the clamps of the elastic force measurement instrument.
The absorbent article (1) of the present invention is stretched 70mm longitudinally with a speed of 500mm/min until elastic strands (14) on the backsheet are stretched. (5 repetative mesaurements are performed for each article having different sizes)
The stress vs.strain curves belonging to the absorbent article (1) of the present invention is prepared. TEST RESULTS and EVALUATION
Table 1: Elastic Force Results of the Absorbent Articles of the Present Invention
Figure imgf000020_0001
In the present invention, the elastic force of strand(s) (14) and/or strip(s) (16) is critical to keep the integrity and shape of the absorbent article (1 ) between standing and sitting positions to prevent sagging/gapping and leakage problems. The elastic force applied by elastomeric features of the present invention is from 0,5 N to 4,0 N, preferably from 0,7N to 3,0 N at an extension of one half of extension length of absorbent article (1) and from 0,5 N to 1 ,5 N at an extension of one quarter of extension length of absorbent article (1) in order to cover the target fit range of antisagging property. Whereas the difference between extended state length of absorbent article (1 ) and relaxed state length of absorbent article (1) corresponds to the extention length (E) of the absorbent article (1). When the elastic force falls below 0,5 N at an extension of one quarter of extention length (E) of absorbent article (1), the product may "feel" loose, sagging occurs that leads to leakage problems. On the other hand, when the elastic force gets above the upper portion of the range of 4,0 N at an extension of one half of extended state of elastic material, the product may "feel" tight and lead to rashes and also, wearer’s discomfort.

Claims

1. An absorbent article (1) having longitudinal axis (X) and lateral axis (Y) located in the middle of absorbent article constitutes a back part (B) and front part (F) comprising, a backsheet (12), a top sheet (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 backsheet (12) comprises; at least one elastomeric strip (16) comprising at least one elastomeric strand (14) said elastomeric strip(s) (16) is attached on/in said backsheet (12) in longitudinal axis (X), in streched form, applying elastic forces to the absorbent article (1 ), localized substantially in the range of absorbent core (10) such that; when in relaxed state, said elastomeric strip(s)(16) reduces the length of said absorbent article (1), wherein said elastomeric strips (16) encompass between 20% and 80% of the length of the absorbent articl e (1 ) (L) in extended state wherein the elastic forces applied from said elastomeric strip(s) (16) to the absorbent article (1) are between 0,5N and 4,0 N at an extension of one half of the extension length of the absorbent article (1).
Whereas the difference between extended state length of absorbent article (1) and relaxed state length of absorbent article (1) corresponds to the extension length of absorbent article (1 ),
2. An absorbent article according to claim (1), wherein said the elastic forces applied from said elastomeric strip(s) (16) to the absorbent article (1) are preferably between 0,7N and 3,0 N at an extension of one half of the extension length of the absorbent article (1).
3. An absorbent article according to claim (1), wherein said elastomeric strip(s) (16) encompass between 30% and 70% of the length of the absorbent article (1) in extended state.
4. An absorbent article (1 ) according to claim (1 ), wherein said elastomeric strip(s) (16) have extention ratio (R) of from 30% to 70%, wherein extention ratio (R) is defined as the ratio of the length of elastic strips (16) in relaxed state (L1) to fully extended state (L2).
5. 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) of the backsheet (12).
6. 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.
7. An absorbent article according to claim 1 , wherein said strips (16) are located at least 5 mm inside of the absorbent core side edge (10.1 ).
8. An absorbent article (1 ) comprising elastomeric strands (14) according to claim 1 , wherein said elastomeric strands (14) is formed of an elastic material comprising styrene block copolymers, polyesters, polyurethanes, polyethers and polyether block copolymers, latex, rubber based polymers or mixtures thereof, preferably polyurethane.
9. An absorbent article (1 ) comprising elastomeric strand(s) (14) formed of polyurethane according to claim 7, wherein the diameter of said polyurethane elastomeric strand (14) is between 200 to 800 micron, preferably between 400 to 600 micron at relaxed state.
10. 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.
11. 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 (10) width range, comprising at least one elastomeric strand (14).
12. A process of manufacturing of absorbent article (1) according to claim 1 , comprising the steps;
i) Stretching one or more elastomeric strand(s) (14) in an amount, to provide an extension ratio (R) of from 305 to 705 (L1/L2) in longitudinal direction of the absorbent article (1).
ii) 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) with attached elastomeric strands (14), in stretched form in flat position as bottom layer,
iv) attaching absorbent core (10) on the backsheet (12),
v) laying topsheet (6) on the absorbent core (10) and backsheet (12) to cover the surface and form the absorbent article (1)
13. An absorbent article (1 ) according to preceding claims wherein, said absorbent article (1) is used as disposable or wearable article comprising baby diapers (2), incontinence diapers (2), pants (4) or pull ups.
PCT/TR2018/050267 2018-05-28 2018-05-28 Absorbent articles having anti-sagging property via specific incorporation of elastomeric features on the designed crotch region Ceased WO2019231409A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5259902A (en) * 1992-09-04 1993-11-09 The Procter & Gamble Company Method for continuously attaching tensioned elastic material to an absorbent article
WO2001028480A1 (en) * 1999-10-15 2001-04-26 Drypers Corporation Disposable absorbent article with containment structure
US20030069555A1 (en) * 2001-10-09 2003-04-10 Erdman Edward P. Padded absorbent article
US20140163503A1 (en) 2012-12-10 2014-06-12 The Procter & Gamble Company Absorbent article with high absorbent material content

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5259902A (en) * 1992-09-04 1993-11-09 The Procter & Gamble Company Method for continuously attaching tensioned elastic material to an absorbent article
WO2001028480A1 (en) * 1999-10-15 2001-04-26 Drypers Corporation Disposable absorbent article with containment structure
US20030069555A1 (en) * 2001-10-09 2003-04-10 Erdman Edward P. Padded absorbent article
US20140163503A1 (en) 2012-12-10 2014-06-12 The Procter & Gamble Company Absorbent article with high absorbent material content

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