WO2007077216A1 - Cover and transfer layer structure for a hygiene product - Google Patents

Cover and transfer layer structure for a hygiene product Download PDF

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Publication number
WO2007077216A1
WO2007077216A1 PCT/EP2007/000022 EP2007000022W WO2007077216A1 WO 2007077216 A1 WO2007077216 A1 WO 2007077216A1 EP 2007000022 W EP2007000022 W EP 2007000022W WO 2007077216 A1 WO2007077216 A1 WO 2007077216A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
fibers
nonwoven
transfer layer
cover
Prior art date
Application number
PCT/EP2007/000022
Other languages
German (de)
French (fr)
Inventor
Alvaro Garcia
Katja Lerner
Original Assignee
Johnson & Johnson Gmbh
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
Priority to DE102006000781.6 priority Critical
Priority to DE102006000781A priority patent/DE102006000781A1/en
Application filed by Johnson & Johnson Gmbh filed Critical Johnson & Johnson Gmbh
Publication of WO2007077216A1 publication Critical patent/WO2007077216A1/en

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53Absorbent 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 absorbing medium
    • A61F13/534Absorbent 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 absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F13/537Absorbent 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 absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51Absorbent 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
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51Absorbent 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
    • A61F13/511Topsheet, i.e. the permeable cover or layer facing the skin
    • A61F13/51121Topsheet, i.e. the permeable cover or layer facing the skin characterised by the material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/022Non-woven fabric
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/08Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer the fibres or filaments of a layer being of different substances, e.g. conjugate fibres, mixture of different fibres
    • BPERFORMING OPERATIONS; TRANSPORTING
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    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02Physical, chemical or physicochemical properties
    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04HMAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/425Cellulose series
    • D04H1/4258Regenerated cellulose series
    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04HMAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/44Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • D04H1/46Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
    • D04H1/498Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres entanglement of layered webs
    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04HMAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • D04H1/541Composite fibres, e.g. sheath-core, sea-island or side-by-side; Mixed fibres
    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04HMAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • D04H1/542Adhesive fibres
    • D04H1/544Olefin series
    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04HMAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • D04H1/542Adhesive fibres
    • D04H1/55Polyesters
    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04HMAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • D04H1/559Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving the fibres being within layered webs
    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04HMAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H13/00Other non-woven fabrics
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51Absorbent 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
    • A61F13/511Topsheet, i.e. the permeable cover or layer facing the skin
    • A61F13/5116Topsheet, i.e. the permeable cover or layer facing the skin being formed of multiple layers
    • AHUMAN NECESSITIES
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    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51Absorbent 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
    • A61F2013/51002Absorbent 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 with special fibres
    • A61F2013/51023Absorbent 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 with special fibres being polymeric fibres
    • A61F2013/51028Absorbent 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 with special fibres being polymeric fibres being bicomponent
    • AHUMAN NECESSITIES
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    • A61FFILTERS 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
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    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
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    • A61F13/511Topsheet, i.e. the permeable cover or layer facing the skin
    • A61F13/513Topsheet, i.e. the permeable cover or layer facing the skin characterised by its function or properties, e.g. stretchability, breathability, rewet, visual effect; having areas of different permeability
    • A61F2013/51338Topsheet, i.e. the permeable cover or layer facing the skin characterised by its function or properties, e.g. stretchability, breathability, rewet, visual effect; having areas of different permeability having improved touch or feeling, e.g. smooth film
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    • B32B2555/00Personal care
    • B32B2555/02Diapers or napkins

Abstract

The invention relates to a cover and transfer layer structure for a hygiene product, comprising at least one nonwoven cover layer, containing superabsorbent fibers and multi-component fibers that are produced by calendering, and at least one nonwoven transfer layer, comprising regenerated cellulose-based fibers and multi-component fibers. The invention also relates to an absorbent product, comprising at least one layer structure according to the claims of the invention, at least one absorbent core, especially adjacent to the nonwoven transfer layer of the layer structure, and optionally at least one substantially fluid-impermeable barrier layer facing the side of the absorbent core which is opposite the layer structure.

Description

Cover and transfer layer structure for a hygiene article

description

The present invention relates to a cover and transfer layer structure for a hygiene article and an absorbent article comprising the cover and transfer layer structure of the invention.

The US 5,728,083 is to take a multi-layered absorbent structure, quickly absorbs the body fluids, and will retain larger quantities of fluids. Such absorbent structures may include, for example, two each multilayer nonwoven layers between which superabsorbent powder has been sprinkled. While the first nonwoven layer comprises a first layer containing PE / PET bicomponent fibers and cellulose fibers, and a second layer containing PE / PET bicomponent fibers and PET fibers, the second non-woven layer is composed of a first layer containing PE / PET bicomponent fibers, a second layer containing PE / PET bicomponent fibers and cellulose fibers, and a third layer containing PE / PET bicomponent fibers together. The entry of superabsorbent particles is technically complicated and requires at least an additional process step. In addition, it must be ensured that the superabsorbent particles are applied too close to the side edges of the nonwoven substrate, otherwise can not be ruled out that these particles fall out of the salable product. In addition, in particular the fine grain fractions of the superabsorbent powder not remain in the layer between the upper and lower non-woven fabric, but penetrate more or less deeply into the respective web a. This leads to no longer predictable absorbing properties.

The US 6,452,062 Bl discloses an absorbent structure comprising first and second layers of carded fibers which are connected together by means of needle punching and thermal bonding. For the first layer viscose, polyester, polyethylene, polypropylene, nylon, ethylene / propylene, copolymer and / or bi-component fibers may in particular be made of cellulose. The second layer is preferably composed of polyester fibers. By the addition of two-component fibers and fibers which are equipped with a heat-activatable adhesive or POWDER with respect to the first and / or second layer of lower melting point, a thermal bonding system is provided which prevents forming of the resulting absorbent article during use fluff. In addition, the resulting absorbent articles retain a high resistance to rewetting.

The US 5,989,688 has a laminate non-woven structure comprising a first support layer and a first bulky layer for controlled acquisition and distribution of liquids to the object. While the bulk layer serves to receive and distribute liquid, the backing layer is provided to retain the fluid, or to pass to a liquid retaining layer. The bulk layer can z. B. be obtained by carding or spunbonding using carded fibers. The support layer may be by a variety of different methods, for. For example, be obtained by means of carding, Spunlaying, Wetlaying, Drylaying or airlaying.

The US 6,608,237 Bl discloses an absorbent article comprising a bottom fluid-impermeable layer, an upper fluid permeable layer and an absorbent core between the topsheet and backsheet. The absorbent core may comprise, for example a matrix of hydrophilic fibers, for example cellulose fibers, are incorporated into the superabsorbent hydrogel-forming particles and, if necessary, synthetic meltblown fibers and / or natural fibers. The superabsorbent particles are substantially homogeneously mixed with the hydrophilic fibers, but can also have a gradient. The upper layer may include natural as well as synthetic fibers, for example cotton fibers, polyester fibers and / or polypropylene fibers comprise. Meltblown or spunbond fiber webs of the upper layer are preferably obtained by means of carding.

From US 6,443,936 Bl, an absorbent article to an adjacent location to the upper fluid acquisition layer shows including, for example polyester, polypropylene, polyethylene, nylon, viscose or cellulose acetate fibers. This acquisition layer can be obtained by airlaying, Wetlaying, meltblowing, spunbonding, carding, thermal bonding or through-air bonding. In a preferred embodiment, the acquisition layer has two laminated layers, an upper layer of spunbonded polypropylene and a lower layer made primarily of cellulosic fibers with a minor proportion of a powdery adhesive. The fibers of the lower layer are connected by airlaying with each other as well as the upper layer.

in the US 6,033,769, finally, is to find an absorbent layer structure comprising a layer of a water-soluble polymer foam, among other things, on which a layer of particulate superabsorbent polymer is fixed. In this way, the superabsorbent material is to be integrated in a simple and reliable manner in a matrix and simultaneously fixed.

The absorbent article according to the prior art, especially those that come with at least one surface on the skin condition, especially over a long period of time, be always perceived as not optimal. This applies particularly to absorbent articles which have already received body fluid during wear. Users of such absorbent articles often complain particularly a lack of softness and spatial extent at the body-facing surface, particularly during extended use after moisture absorption. Is also, like pantiliners or sanitary napkins usual, the body-facing surface is moved relative to the adjacent area of ​​skin during wear or moved, it is often an irritation of the skin, among other things, caused by frictional effects observed. These adverse properties can not be shut off easily by the above-described absorbent article.

The present invention was therefore based on the object to provide a sanitary absorbent article having a top layer is available, which is not associated with the drawbacks of the prior art and feels soft and bulky in particular during extended use after the fluid wetting and not to resulting irritation of the skin caused by friction.

Accordingly, a cover and transfer layer structure was found for a hygiene article comprising at least one nonwoven cover layer comprising superabsorbent fibers and multi-component fibers which is manufactured by means of calendering, and at least one nonwoven transfer layer comprising fibers of regenerated on the basis of cellulose, as well as multi-component fibers.

The cover layer of the layer structure of the invention, which has a top and an opposite bottom side may be disposed in the structure of the invention in such a way that the upper side is open and accessible readily outwardly, while the underside abuts against the top of the transfer layer. Alternatively, the upper surface of the cover layer can itself in turn at least partly with a further layer or ply, z. As a protective layer to be covered. Preferably, the upper surface of the top layer is also the outside of an absorbent article.

Under a cover and transfer layer structure for hygiene articles according to the present invention, such structures are to be understood in principle, formed from at least one separate cover layer and at least one separate transfer layer, regardless of whether detect macroscopically layers in the inventive layer structure after their completion to let.

Suitable regenerated cellulose fibers include viscose, modal, cupro, cellulose acetate and / or lyocell. Viscose fibers are particularly preferred.

Regenerated cellulose fibers is obtained as natural cellulose fibers from the so-called wood fiber pulp. Regenerated cellulose fibers and their preparation are well known in the art and commercially available readily. In lyocell is environmentally friendly producible regenerated cellulose fibers. These fibers are obtained by extrusion of tertiary in an aqueous amine N-oxide, for example N-methylmorpholine-N-oxide, dissolved cellulose into an aqueous coagulating bath after the solvent Spinnververfahren. For further details concerning the manufacturing process of lyocell fibers is referred to the US 5,094,690. Lyocell fibers are similar in their properties, rather than cotton fiber rayon fibers. They are distinguished in particular by high strength when wet. lyocell can eg be purchased under the trade name Lenzing Lyocell by the company Acordis Cellulosic Fiber under the trade name Tencel or company Lenzing Fibers.

Suitable multicomponent fibers include, for. B. bi- and tri-component fibers. Under such bicomponent fibers are generally understood, in which two different polymers are present in non-homogeneous form next to each other. This may mean, in one embodiment, two polymers are juxtaposed side by side in a fiber strand. In a further embodiment, a first polymer may form the core, which is surrounded by a second polymer. It is also possible that a first polymer is completely surrounded by a second polymer to form individual islands in the second polymer. Suitable bi-component fibers consist generally of two thermoplastic polymers such as polyolefins and polyamides, polyolefins and polyesters or polyamides and polyesters. Particularly suitable for the present nonwoven fabrics are for. B. bicomponent fiber based on Polyolfinen and polyesters, in particular comprising the combination of polyethylene / polyethylene terephthalate, and polypropylene / polyethylene terephthalate. It is further provided in another embodiment that the bicomponent polyethylene / polypropylene fiber, a polypropylene / polyethylene terephthalate fiber, a polyethylene / polyethyl terephthalate fiber, a polyethylene terephthalate / co-polyethylene terephthalate fiber, and any mixture thereof. Bicomponent fibers based on polyethylene and polypropylene are particularly preferred. Here, the polypropylene preferably forms the core of these bi-component fiber.

Furthermore, the present case to subsume even so-called "spiral crimp" fiber under appropriate bi-component fibers. "Spiral crimp" fibers are generally obtained by the use of which is used in two different viscosities of a thermoplastic polymer. An example are the "spiral crimp" -Polyesterfasern St. 8Y Unitika Ltd., Japan, and 7-HCS Company Sum Yang, known as South Korea. The different viscosities of the polyester polymers used here, usually go back to the use of polyesters with different molecular weight. "Spiral crimp" fibers are characterized regularly by a helical configuration. For more details about "spiral crimp" fibers reference is made to US 5,723,215.

The cover layer of the layer structure of the invention is obtained by means of calendering. Here, the blended preferably homogeneous, the coating film forming fibers passed through the rolls of a calendering machine, where preferably at least one of the rollers is heated. During passage through the machine calender, the fibrous material is preferably subjected to both pressure and heat. The particular homogeneously mixed, the transfer layer-forming fibers is processed using the air-through bonding technology to a fibrous web. Here, the fiber mixture is treated with a controlled flow of heated air, so that at least at least partially to melt some of the fibers of the multicomponent fiber at its surface and bond upon cooling with adjacent fibers. In general, it is already sufficient if the exposure to the bond-forming fibrous web to be subjected to the heated air about 5 to 10 seconds. The air temperature should be in this case preferably selected such that at least the outer regions of the multi-component fibers partially soften. In addition to the multicomponent fibers and thermoplastic powder or granules can be used to bind with formation or solidification. These powders and granules are preferably distributed uniformly in the nonwoven material.

In a further embodiment it is provided that at least one nonwoven layer and / or at least one fibrous nonwoven transfer layer further comprise natural fibers and / or synthetic fibers.

Suitable natural fibers include, for. As cotton, wool, silk, linen, sisal, hemp, flax, ramie and jute fibers and any mixtures thereof.

As synthetic fibers, for example fibers are based on polyolefins such as polyethylene and polypropylene, polyamides, polyacetals, z. As polyoxymethylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyacrylates or polymethacrylates such as polymethyl methacrylate, into consideration. Further, be made of aramid fibers, acrylic fibers or polyvinyl alcohol fibers as synthetic fibers.

Be particularly advantageous layer structures according to the invention have been shown in which the nonwoven layer (s) about 60 to 99 wt .-%, in particular 88 to 96 wt .-%, of multi-component fibers, natural fibers and / or synthetic fibers and 1 to 40 wt. -%, especially 4 to 12 wt .-%, of superabsorbent fibers comprises or comprise in each case based on the total weight of the nonwoven layer (s).

Already by using only small amounts of superabsorbent fibers in the top layer succeeds in a particularly comfortable to wear, even in continuous use to ensure. In combination with multi-component fibers, the cover layer is characterized by superior softness and particularly good sliding properties on the skin. Even with heavy use, such as during exercise, wearing a previously wetted with body fluid absorbent article comprising the multilayer structure according to the invention, not bothersome. Skin irritations do not occur. Rather, the surface of the layer structure of the invention sliding in the wetted with fluid and unwetted state soft and gentle to the skin over the applied or pressed-skin.

Particularly satisfactory results are obtained with the inventive layer structures, in which the multicomponent fiber comprises a bicomponent fiber, in particular a PP / PE-bicomponent fiber.

In this case, such layer structures are preferred, which are characterized in that the bi-component fiber of the nonwoven transfer layer comprises at least an eccentric bicomponent fiber, in particular an eccentric PP / PE-bicomponent fiber. With the above layer structures are particularly good fluid acquisition properties set.

It can be provided that the non-woven fabric cover layer has a basis weight in the range of about 5 to 45 g / m 2, in particular in the range of about 10 to 35 g / m 2 has.

Further, it can be provided that the nonwoven transfer layer comprising a basis weight in the range of about 5 to 80 g / m 2, in particular in the range of about 10 to 40 g / m 2. According to another aspect of the present invention, an absorbent article is provided, which at least one layer structure according to one of the preceding claims, at least an absorbent core, particularly adjacent to the nonwoven transfer layer of the layer structure, and optionally at least one substantially fluid-impervious barrier layer of the side facing the absorbent core which is opposite the layer structure comprising.

Suitable absorbent articles such place. As sanitary napkins, panty liners, diapers, incontinence protection products, wound dressings and wipes. Furthermore, it is possible to equip tampons with the inventive layer structure.

The object underlying the invention is further achieved by a method for producing a laminated cover and transfer layer structure for sanitary products, comprising the steps of:

a) preparing at least one non-woven fabric for at least one cover layer comprising a top side and an opposite underside, of superabsorbent fibers and multicomponent fibers means of calendering,

b) preparing at least one non-woven fabric for at least one transfer layer comprising a top side and an opposite underside, of fibers based on regenerated cellulose, as well as multi-component fibers by air-through bonding technology, and

c) forming a laminate of cover layer and transfer layer of the webs of cover and transfer layer, wherein the underside of the top layer and the top of the transfer layer are adjacent to each other. The laminate of cover layer and transfer layer can be used advantageously by means of thermobonding, in particular calendering and / or through-air-bonding, water-jet and / or mechanical needling (needle punching) was obtained. The through-air bonding technique is particularly preferred and provides particularly airy, light products.

The inventive layer structure surprisingly absorbent articles can be obtained whose surfaces also feel even after wetting with a body fluid soft and bulky and which can be moved on the skin without or with very low frictional resistance. Further, body fluids enter even after repeated wetting of the top layer of the layer structure of the invention readily therethrough without being hampered by superabsorbent fiber associations, which are already loaded with fluid. Even larger amounts of fluid occur within a very short time, for. B. in only about 15 sec, due to the inventive layer structure therethrough.

Below the absorption and retention capacity is exemplified by means of a specific inventive layer structure.

The layered structure according to the invention comprised a nonwoven cover layer of 95 wt .-% of bicomponent fibers of the company Fiber Visions (ES-Cure, 2.2 dtex) and 5 wt .-% of superabsorbent fibers of the company Oasis (Superabsorbent Fibers 102) produced by calendering, and a nonwoven transfer layer of 67 wt .-% of a bicomponent fiber of the company fiber Visions (ES-Superbulk, 3.3 dtex) and 33 wt .-% of viscose fibers of the company Lenzing (1.7 dtex). While the top layer had a basis weight of 15 g / m 2, the transfer layer had a basis weight of 40 g / m 2.

For comparison, the absorption and retention capacity were a layered structure of a cover layer containing thermo-bonded polypropylene fibers, and a transfer layer formed by the air-through bonding technology, containing 70 wt .-% of bicomponent fibers and 30 wt .-% PET fibers, examined.

The absorption capacity of present in outline form of a sanitary napkin laminate structure was tested by 7 ml were added dropwise to aqueous test fluid to a location of the covering layer in such a way that each drop penetrated the laminated structure and has been absorbed. The period between the occurrence of the first liquid droplet and the last complete absorption of the liquid drop was determined.

The retention capability of this laminate structure has been determined in such a manner that the product previously described, soaked with liquid with ten layers of filter paper MN 615 (Macherey and Nagel) covered and weighted for three minutes with a weight of 5 kg. The difference between the weight of the filter paper in the dry state and after three minutes of contact with the test liquid containing laminate structure was determined as a measure of their retention capacity.

The absorption time of the comparative structure, determined using the previously described method, was about 1 1 seconds that the structure of the invention for about 20 seconds. For the specific retention capacity by the above method a value of 0.9 g for the reference structure and of 1.1 g was determined for the inventive structure. With regard to absorption and retention capacity, the layer structure of the invention is thus equally be described as quite conventional layer structures, but feels unlike conventional layer structures from cover and transfer layer during extended use after the fluid wetting yet always soft and bulky and does not cause irritation skin due to friction. The features disclosed in the foregoing description and in the claims the invention may be both separately and in any combination material for realizing the invention in its various embodiments.

Claims

claims
1. cover and transfer layer structure for a sanitary article comprising at least one nonwoven cover layer comprising superabsorbent fibers and multi-component fibers which is manufactured by means of calendering, and at least one nonwoven transfer layer comprising fibers of regenerated on the basis of cellulose, as well as multi-component fibers.
2nd layer structure according to claim 1, characterized in that at least include a nonwoven layer and / or at least one fibrous nonwoven transfer layer further comprises natural fibers and / or synthetic fibers.
3rd layer structure according to claim 1 or 2, characterized in that the nonwoven cover layer (s) about 60 to 99 wt .-%, in particular 88 to 96% by weight, of multi-component fibers, natural fibers and / or synthetic fibers and 1 to 40 wt .-%, in particular 4 wt .-%, of superabsorbent fibers comprises or comprise up to 12, in each case based on the total weight of the nonwoven layer (s).
4th layer structure according to any one of the preceding claims, characterized in that the multicomponent fiber comprises a bicomponent fiber.
5. Layer structure according to claim 4, characterized in that the bi-component fiber of the nonwoven transfer layer comprises at least an eccentric bicomponent fiber.
6. Layer structure according to one of the preceding claims, characterized in that the fiber on the basis of regenerated cellulose comprises viscose fibers.
7th layer structure according to any one of the preceding claims, characterized in that the nonwoven cover layer comprising a basis weight in the range of about 5 to 45 g / m 2, in particular in the range of about 10 to 30 g / m 2.
8. layered structure according to any one of the preceding claims, characterized in that the nonwoven transfer layer comprising a basis weight in the range of about 5 to 80 g / m 2, in particular in the range of about 10 to 40 g / m 2.
9. An absorbent article comprising at least one layer structure according to one of the preceding claims, at least an absorbent core, particularly adjacent to the nonwoven transfer layer of the layer structure, and optionally at least one substantially flui dundurchlässige barrier layer, which faces the side of the absorbent core that the layer structure opposite.
10. An absorbent article according to claim 9, characterized in that it comprises a sanitary napkin, a panty liner, a diaper, an incontinence guard, a wound dressing, a wipe and a tampon.
11. A method for producing a laminated cover and transfer layer structure for hygiene articles, in particular according to one of claims 1 to 8, comprising the steps of: a) preparing at least one non-woven fabric for at least one cover layer comprising a top side and an opposite underside, of superabsorbent fibers and multi-component fibers by means of calendering,
b) preparing at least one non-woven fabric for at least one transfer layer comprising a top side and an opposite underside, of fibers based on regenerated cellulose, as well as multi-component fibers by air-through bonding technology, and
c) forming a laminate of cover layer and transfer layer of the webs of cover and transfer layer, wherein the underside of the top layer and the top of the transfer layer are adjacent to each other.
12. The method according to claim 11, characterized in that the laminate of cover layer and transfer layer by means of thermobonding, in particular calendering and / or through-air-bonding, water-jet and / or mechanical needling (needle punching) is prepared.
PCT/EP2007/000022 2006-01-04 2007-01-03 Cover and transfer layer structure for a hygiene product WO2007077216A1 (en)

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