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WO2018184042A1 - Bande non tissée conçue pour être utilisée dans une lingette de nettoyage industrielle - Google Patents

Bande non tissée conçue pour être utilisée dans une lingette de nettoyage industrielle Download PDF

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Publication number
WO2018184042A1
WO2018184042A1 PCT/AT2017/000023 AT2017000023W WO2018184042A1 WO 2018184042 A1 WO2018184042 A1 WO 2018184042A1 AT 2017000023 W AT2017000023 W AT 2017000023W WO 2018184042 A1 WO2018184042 A1 WO 2018184042A1
Authority
WO
WIPO (PCT)
Prior art keywords
nonwoven material
nonwoven
filaments
web
cellulosic
Prior art date
Application number
PCT/AT2017/000023
Other languages
English (en)
Inventor
Tom Carlyle
Mirko Einzmann
Gisela Goldhalm
Malcolm John Hayhurst
Katharina Mayer
Ibrahim Sagerer-Foric
Original Assignee
Lenzing Ag
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 Lenzing Ag filed Critical Lenzing Ag
Priority to PCT/AT2017/000023 priority Critical patent/WO2018184042A1/fr
Publication of WO2018184042A1 publication Critical patent/WO2018184042A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING 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
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/013—Regenerated cellulose series
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered 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
    • B32B5/02—Layered 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
    • B32B5/022—Non-woven fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered 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
    • B32B5/02—Layered 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
    • B32B5/06—Layered 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 characterised by a fibrous or filamentary layer mechanically connected, e.g. by needling to another layer, e.g. of fibres, of paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered 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
    • B32B5/22—Layered 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
    • B32B5/24—Layered 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
    • B32B5/26—Layered 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered 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
    • B32B7/02—Physical, chemical or physicochemical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered 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
    • B32B7/04—Interconnection of layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered 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
    • B32B7/04—Interconnection of layers
    • B32B7/06—Interconnection of layers permitting easy separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered 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
    • B32B7/04—Interconnection of layers
    • B32B7/08—Interconnection of layers by mechanical means
    • B32B7/09—Interconnection of layers by mechanical means by stitching, needling or sewing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered 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
    • B32B7/04—Interconnection of layers
    • B32B7/10—Interconnection of layers at least one layer having inter-reactive properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered 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
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/12—Stretch-spinning methods
    • D01D5/14—Stretch-spinning methods with flowing liquid or gaseous stretching media, e.g. solution-blowing
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING 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
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-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
    • D04H1/42—Non-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
    • D04H1/425—Cellulose series
    • D04H1/4258—Regenerated cellulose series
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING 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
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-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
    • D04H1/42—Non-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
    • D04H1/4374—Non-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 using different kinds of webs, e.g. by layering webs
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING 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
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-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
    • D04H1/44—Non-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
    • D04H1/46—Non-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
    • D04H1/492—Non-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 by fluid jet
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING 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
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/10—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between yarns or filaments made mechanically
    • D04H3/11—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between yarns or filaments made mechanically by fluid jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/02—2 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/03—3 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/04—4 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/05—5 or more layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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    • B32B2250/20—All layers being fibrous or filamentary
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
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    • B32B2262/06—Vegetal fibres
    • B32B2262/062—Cellulose fibres, e.g. cotton
    • B32B2262/065—Lignocellulosic fibres, e.g. jute, sisal, hemp, flax, bamboo
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
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    • B32B2432/00—Cleaning articles, e.g. mops or wipes

Definitions

  • This invention relates to a nonwoven material suitable to be used as an industrial general purpose cleaning wipe, and, more particularly, to such a material containing at least an essentially pure cellulose nonwoven web formed of essentially continuous filaments and multibonded by merged filaments, hydrogen bonding and/or physical intermingling of filaments.
  • This web provides the cleanability, dimensional stability, wet strength, abrasion resistance, solvent resistance and absorbency required by an industrial general purpose cleaning wipe.
  • essentially pure cellulose shall address the fact that cellulosic moulded bodies, e.g. made according to the lyocell process, always contain a small amount of polymers other than cellulose, namely hemicellulose. This does not influence in any way the suitability for the use according to this invention.
  • U.S. 3,879,257 describes a cellulosic nonwoven described as double re-crepe, or DRC, bonded with a latex binder.
  • Coform is a nonwoven combining meltblown polyolefin with wood pulp and is described in U.S.
  • U.S. 8,333,918 and U.S. 7,994,079 describe U.S. a 100% meltblown polyolefin nonwoven used for wipers.
  • U.S. 7,194,788 describes a hydroentangled composite material containing both staple length fibers as well as meltblown polyolefin webs.
  • JP 2014159662 describes a laminate of hydrophobic and hydrophilic nonwovens.
  • WIPO WO2014094722 describes an airlaid pulp nonwoven used as a wiper.
  • U.S. 3,879,257 describes a primarily wood pulp based wiper, but abrasion resistance and strength are only moderate and requires the use of a wet strength adding polymeric latex binder, which also imparts non- biodegradability.
  • U.S. 8,333,918 and U.S. 7,994,079 describe products based on meltblown polyolefins, which deliver excellent abrasion resistance, but little absorbency and liquid drying capability. These products are also not biodegradable.
  • U.S. 4,818,464, U.S. 4,100,324, and U.S. 7,194,788 recognize the value of meltblown nonwovens for strength combined with cellulosic nonwovens for absorbency. However, meltblown polyolefin based nonwovens are not biodegradable; they also contribute very limited liquid absorbency.
  • the present invention relates to the use of specially designed nonwoven substrates produced using novel variants of the spunlaid nonwoven process, comprising 100% cellulose polymers.
  • spunlaid cellulose webs There are known methods and products using spunlaid cellulose webs.
  • none of this prior art teaches production methods for, or products addressing the specific substrate requirements for industrial cleaning wipes.
  • Industrial cleaning wipes or wipers are typically based on paper, textiles or nonwovens. These substrates are used in combination with either an aqueous cleaning solution or solvent based cleaning fluid. Usually, the cleaning solution or fluid is applied to the surface, then the wipe is used to combine with the cleaning solution while applying cleaning force to the surface and moving the cleaning fluid over the surface.
  • a cleaning wipe or wiper must be able to clean a surface (cleanability); it should do so without abrading or deteriorating. Additionally no lint or wipe material should be left on a surface after cleaning. The wipe or wiper must not tear when wet and wiping a surface. Additionally, the wiper must be able to absorb and remove the spent or used cleaning solution. Finally, biodegradability of the wipe and a sustainable production process are desired.
  • Cellulosic fiber nonwoven based wipes like wetlaid double recrepe or airlaid nonwovens, address absorbency and biodegradability needs, but fall short in strength and abrasion resistance.
  • Composites like coform or hydroentangled spunbond pulp) and laminates combining
  • meltblown and cellulosic nonwovens are good compromises, providing average strength, abrasion resistance, and absorbency, with partial
  • This nonwoven material is characterized in that the cellulosic nonwoven web is made from essentially pure cellulose formed of essentially continuous filaments and multibonded by merged filaments, hydrogen bonding and physical intermingling of the filaments.
  • the nonwoven material according to the invention is used in an industrial cleaning wipe that is designed to be a biodegradable, compostable and sustainable nonwoven with excellent cleanability, high strength, high abrasion resistance, high absorbency, and 100% biodegradability.
  • the nonwoven web which is a 100% essentially continuous filament cellulose nonwoven will provide both high strength/abrasion resistance and high absorbency, and as a sustainable product, produced using an environmentally sound process.
  • the present invention is more absorbent and biodegradable and sustainably produced.
  • the present invention Compared to nonwoven substrates based on cellulosic fibers, the present invention has superior strength and abrasion resistance, with comparable absorbency, biodegradability and sustainability.
  • the present invention Compared to composites, including those of hydroentangled combinations of meltblown polyolefins with cellulose materials, the present invention has equivalent strength, superior cleanability, liquid take up rate, and overall absorbency.
  • the degree of merged filament bonding also results in a wider range of filament diameters and cross-sections being present. This characteristic enables additional cleanability versus nonwoven webs with a tight range of fiber and/or filament diameters.
  • the inventive nonwoven material is further bonded or treated by a hydroentanglement process. It surprisingly still has acceptable consumer acceptable drape and softness while it still can be loaded with a solution, has high wet strength and abrasion resistance, is absorbent and dispenses absorbed liquids uniformly, and is compostable and based on renewable resources.
  • the first cellulosic nonwoven web is preferably made according to a lyocell process.
  • Cellulosic fibres can be produced by various processes.
  • a lyocell fibre is spun from cellulose dissolved in N-methyl morpholine N-oxide (NMMO) by a meltblown process, in principle known from e.g. EP 1093536 B1 , EP 2013390 B1 and EP 2212456 B1.
  • meltblown it will be understood that it refers to a process that is similar or analogous to the process used for the production of synthetic thermoplastic fibres (filaments are extruded under pressure through nozzles and stretched to required degree by high velocity/high temperature extension air flowing substantially parallel to the filament direction), even though the cellulose is dissolved in solution (i.e.
  • the web is formed by a spun bonding process, where filaments are stretched via lower temperature air.
  • spunbonded synthetic fibres are longer than meltblown synthetic fibres which usually come in discrete shorter lengths. Fibres formed by the solution blown lyocell process can be continuous or discontinuous depending on process conditions such as extension air velocity, air pressure, air temperature, viscosity of the solution, cellulose molecular weight and distribution and combinations thereof.
  • the fibres are contacted with a non-solvent such as water (or water/NMMO mixture) by spraying, after extrusion but before web formation.
  • a non-solvent such as water (or water/NMMO mixture)
  • the fibres are subsequently taken up on a moving foraminous support to form a nonwoven web, washed and dried.
  • Freshly-extruded lyocell solution ('solvent spun', which will contain only, for example, 5-15% cellulose) behaves in a similar way to 'sticky' and deformable thermoplastic filaments. Causing the freshly-spun filaments to contact each other while still swollen with solvent and with a 'sticky' surface under even low pressure will cause merged filament bonding, where molecules from one filament mix irreversibly with molecules from a different filament. Once the solvent is removed and coagulation of filaments completed, this type of bonding is impossible.
  • coagulation liquor i.e. a liquid which is able to cause coagulation of the dissolved cellulose; in a lyocell process this preferably is water or a diluted solution of NMMO in water, is applied to control the merged filament bonding.
  • the amount of merged filament bonding is directly dependent on the stage of coagulation of the filaments when the filaments come into contact. The earlier in the coagulation process that the filaments come into contact, the greater the degree of filament merging that is possible. Both placement of the coagulation liquor application and the speed at which the application liquor is applied can either increase, or decrease, the rate of coagulation. Which results in control of the degree (or amount) of merged filament bonding that occurs in the material.
  • the merged filament bonding is further controlled by filament spinning nozzle design and arrangement and the configuration and temperature of filament extension air.
  • the degree of molecular alignment that is present as the solution exits the spinning nozzle has an impact on the coagulation rate. The more aligned the molecules are, the faster the coagulation rate, and conversely, the less aligned the molecules are, the slower the coagulation rate.
  • the spinning nozzle design and arrangement, along with the molecular weight of the cellulosic raw material used will determine the starting coagulation rate at the exit of the spinning nozzle. Additionally, the rate of cooling (temperature decrease) of the solution upon spinning nozzle exit will impact the coagulation rate as well.
  • At least two spinnerets also known as jets
  • spinnerets preferably between two and ten, and further preferred between 2 and 6, each one arranged to form a layer of nonwoven web
  • spinnerets are used to obtain a multilayer nonwoven material.
  • the filaments are spun using a solution of cellulose in an aqueous amine oxide and the coagulation liquor is water, preferably with a content of amine oxide not being able to dissolve cellulose, also referred to as a lyocell process; the manufacture of such a solution is in principle known, e.g. from U.S. 6,358,461 , U.S. 7,067,444, U.S. 8,012,565, U.S. 8,191 ,214, U.S.
  • the present invention describes a ceilulosic nonwoven web produced via a meltblown or spunbond-type process.
  • the filaments produced are subjected to touching and/or compaction and/or intermingling at various points in the process, particularly before and during initial web formation.
  • Contact between filaments where a high proportion of solvent is still present and the filaments are still swollen with said solvent causes merged filament bonding to occur.
  • the amount of solvent present as well as temperature and contact pressure controls the amount of this bonding.
  • the amount of filament intermingling and hydrogen bonding can be limited by the degree of merged filament bonding.
  • This is the result of a decrease in filament surface area and a decrease in the degree of flexibility of the filaments.
  • the degree of merged filament bonding increase, the amount of overall surface area is decreased, and the ability of cellulose to form hydrogen bonds is directly dependent on the amount of hydroxyl groups present on the ceilulosic surface.
  • filament intermingling happens as the filaments contact the forming belt. The filaments are traveling at a faster rate of speed than the forming belt. Therefore, as the filament contacts the belt, it will buckle and sway side to side, and back and forth, just above the forming belt.
  • the filaments will intermingle with neighboring filaments. If the filaments touch and merge prior to the forming belt, this limits the number of neighboring filaments by which it can intermingle with. Additionally, filaments that merge prior to contacting the forming belt with not have the same degree of flexibility as a single filament and this will limit the total area over which the filament will buckle and sway.
  • the nonwoven material is dried prior to subsequent bonding/treatment.
  • the percentage of each type of bonding is controlled using a process with up to two compaction steps, where one of these compaction steps is done after step d. of the inventive process where the spun filaments are still swollen with a solvent, and one of these compaction steps is done before or in step e. of the inventive process where all or most of the solvent has been removed and the web has been wet with water.
  • control of the coagulation of the spun solution is a factor in controlling the degree of merged filament bonding.
  • This preferred embodiment concerns decreasing the coagulation rate to a state where additional compaction steps can be used after filament laydown to further increase the actual amount of merged filament boding that is achievable. It might be helpful to view the maximum achievable filament bonding as the state where we have merged all filaments into an essentially film-like structure.
  • the present invention describes a process and product where merged filament bonding, physical intermingling and hydrogen bonding can be controlled independently.
  • the degree of merged filament bonding can limit the degree of physical intermingling and hydrogen bonding that can occur.
  • process conditions can be adjusted to optimise these bonding mechanisms between layers. This can include modifying ease of delamination of layers, if required.
  • bonding/treatment steps may optionally be added. These bonding/treatment steps may occur while the web is still wet with water, or dried (either fully or partially).
  • bonding/treatment steps may add additional bonding and/or other web property modification.
  • These other bonding/treatment steps include hydroentangling or spunlacing, needling or needlepunching, adhesive or chemically bonding.
  • various post- treatments to the web may also be applied to achieve specific product performance.
  • post-treatments it is possible to apply finishes and other chemical treatments directly to the web of this invention during production which will not then be removed, as occurs with, for example, a post-treatment hydroentanglement step.
  • Varying the degree of merged filament bonding provides unique property characteristics for nonwoven cellulose webs with regards to softness, stiffness, dimensional stability and various other properties. Properties may also be modified by altering the degree of physical intermingling before and during initial web formation. It is also possible to influence hydrogen bonding, but the desired effect of this on web properties is minor. Additionally, properties can be adjusted further by including an additional
  • bonding/treatment step such as hydroentangling, needlepunching, adhesive bonding and/or chemical bonding.
  • Each type of bonding/treatment provides benefits to the nonwoven web.
  • hydroentangling can add some strength and soften the web as well as potentially modifying bulk density; needling is typically employed for higher basis weights and used to provide additional strength; adhesive and chemical bonding can add both strength and surface treatments, like abrasive material, tackifiers, or even surface lubricants.
  • the present invention allows independent control of the key web bonding features: merged filaments, intermingling at web formation, hydrogen bonding and optional additional downstream processing. Manipulation of merged filament bonding can be varied to predominantly dictate the properties of the nonwoven web.
  • the nonwoven material contains a second layer, consisting of a cellulosic nonwoven web, which is formed of essentially continuous filaments, pulp fiber or staple fiber, which is formed on top of the first cellulosic nonwoven web, and subsequently both layers are hydroentangled together.
  • a cellulosic nonwoven web which is formed of essentially continuous filaments, pulp fiber or staple fiber, which is formed on top of the first cellulosic nonwoven web, and subsequently both layers are hydroentangled together.
  • the nonwoven material contains a third layer, consisting of a cellulosic nonwoven, which is formed of essentially continuous filaments, pulp fiber or staple fiber, which is formed on top, and subsequently all three layers are hydroentangled together
  • a third layer consisting of a cellulosic nonwoven, which is formed of essentially continuous filaments, pulp fiber or staple fiber, which is formed on top, and subsequently all three layers are hydroentangled together
  • another useful advantage is to have one outer layer as high density for cleaning a surface (“scrubby layers”), another outer layer to have a high surface area for excellent cleanability with the center layer designed to have a high absorbent capacity.
  • one or more of the cellulosic nonwoven layers within the nonwoven material, if formed of essentially continuous filaments, are made according to a lyocell process.
  • the lyocell process allows for use of a sustainable raw material (pulp) and provides a final filament with high purity (very low residual chemicals).
  • pulp sustainable raw material
  • a two-layer material according to the invention either both layers consist of continuous filaments, made according to a lyocell process, or one layer consist of continuous filaments, made according to a lyocell process, and the second layer consist of pulp fiber.
  • a three-layer material in particularly preferred embodiments of a three-layer material according to the invention either all three layers consist of continuous filaments, made according to a lyocell process, or the two outer layers consist of continuous filaments, made according to a lyocell process, and the middle layer consist of pulp fiber.
  • the resulting wipe is both water and oil absorbent, has acceptable consumer acceptable drape and softness and is compostable and based on renewable resources.
  • Still another object of the present invention is to provide a compostable industrial cleaning wipe, containing the inventive nonwoven material according as a base sheet.
  • the nonwoven material of the compostable industrial cleaning wipe is further process by hydroentanglement. Undergoing this additional process enables a greater range of wipe functionality design. Such attributes as thickness, drape, softness, strength and aesthetic appearance can be tailored to meet specific wipe requirements.
  • a 50-gsm wipe product of the present invention was compared to the cleanability performance, strength and stiffness of a commercially available industrial wipe of same basis weight being comprised of spunbond
  • polypropylene wetlaid pulp and being hydroentangled.
  • Tensile properties were measured according to standard method DIN EN 29 073 part 3/ISO 9073-3, although a clamping length of 8cm rather than 20cm was used. Stiffness was measured using a 'Handle-o-meter', according to standard method WSP 90.3, with 1 ⁇ 4-inch slot width, stainless steel surface, 1000 g beam. The sample size tested was 10 x 10 cm.
  • the 50-gsm wipe product of invention of example 1 was further analyzed for water uptake speed and level and water absorbency capacity versus the competitive product of example 1.
  • the sample of invention showed a 3 % higher water absorbency capacity than the competitive product.
  • ATS Absorbency Testing System ATS-600, of Sherwood Instruments, Inc., Lynnfield, USA. With that, the test sample (sample size round, diameter 5 cm) was supplied with water from the bottom and water taken up by the sample without having any hydrostatic pressure is evaluated. The measurement for each sample is stopped when the taken up amount of water is below 0.005g/20sec
  • Fig. 1 it can be seen that the sample of the invention has a much faster average liquid uptake and levels off at a higher average end value than the sample being spunbond polypropylene, wetlaid pulp and hydroentangled.
  • Fig. 1 shows the water uptake speed average of 5 measurements of sample 1 (sample of invention) versus sample 2 (spunbond polypropylene, wetlaid pulp and hydroentangled).
  • Example 2 shows that the product of invention is superior to the tested competitive product in liquid uptake speed and amount and in holding the absorbed water.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Nonwoven Fabrics (AREA)
  • Cleaning Implements For Floors, Carpets, Furniture, Walls, And The Like (AREA)

Abstract

L'objet de la présente invention concerne un matériau non tissé adapté à être utilisé dans une lingette de nettoyage industrielle contenant au moins une première bande de non-tissé cellulosique qui (a) présente une excellente aptitude au nettoyage, (b) présente une résistance à l'état humide élevée et une résistance à l'abrasion élevée, (c) est absorbante et capable de distribuer des liquides absorbés de façon uniforme et (d) est biodégradable, compostable et à base de ressources renouvelables, la bande de non-tissé cellulosique étant composée de cellulose essentiellement pure formée de filaments essentiellement continus et multiliée par des filaments fusionnés, une liaison hydrogène et un enchevêtrement physique des filaments, et l'utilisation du matériau non tissé selon l'invention en tant que feuille de base pour la fabrication d'une lingette de nettoyage industrielle compostable. Un autre objet de l'invention concerne une lingette de nettoyage industrielle compostable qui contient le matériau non tissé de l'invention en tant que feuille de base.
PCT/AT2017/000023 2017-04-03 2017-04-03 Bande non tissée conçue pour être utilisée dans une lingette de nettoyage industrielle WO2018184042A1 (fr)

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EP3823820A1 (fr) * 2018-07-19 2021-05-26 Celwise AB Structure stratifiée et son procédé de production
EP4110983B1 (fr) 2020-02-24 2024-07-03 Lenzing Aktiengesellschaft Procédé et appareil permettant de produire un non-tissé composite
WO2024223041A1 (fr) 2023-04-26 2024-10-31 Essity Hygiene And Health Aktiebolag Non-tissé hydro-enchevêtré comprenant des filaments cellulosiques

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Publication number Priority date Publication date Assignee Title
EP3823820A1 (fr) * 2018-07-19 2021-05-26 Celwise AB Structure stratifiée et son procédé de production
EP4110983B1 (fr) 2020-02-24 2024-07-03 Lenzing Aktiengesellschaft Procédé et appareil permettant de produire un non-tissé composite
WO2024223041A1 (fr) 2023-04-26 2024-10-31 Essity Hygiene And Health Aktiebolag Non-tissé hydro-enchevêtré comprenant des filaments cellulosiques

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