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WO2018184046A1 - Matériau non tissé conçu pour être utilisé en tant que milieu filtrant - Google Patents

Matériau non tissé conçu pour être utilisé en tant que milieu filtrant Download PDF

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Publication number
WO2018184046A1
WO2018184046A1 PCT/AT2017/000027 AT2017000027W WO2018184046A1 WO 2018184046 A1 WO2018184046 A1 WO 2018184046A1 AT 2017000027 W AT2017000027 W AT 2017000027W WO 2018184046 A1 WO2018184046 A1 WO 2018184046A1
Authority
WO
WIPO (PCT)
Prior art keywords
filaments
nonwoven material
nonwoven
filter media
web
Prior art date
Application number
PCT/AT2017/000027
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/AT2017/000027 priority Critical patent/WO2018184046A1/fr
Publication of WO2018184046A1 publication Critical patent/WO2018184046A1/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
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/18—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being cellulose or derivatives 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
    • D04H1/44—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
    • D04H1/498—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 entanglement of layered 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
    • D04H1/54—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 by welding together the fibres, e.g. by partially melting or dissolving
    • D04H1/552—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 by welding together the fibres, e.g. by partially melting or dissolving by applying solvents or auxiliary agents
    • 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
    • D04H3/16—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 thermoplastic filaments produced in association with filament formation, e.g. immediately following extrusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/0604—Arrangement of the fibres in the filtering material
    • B01D2239/0618—Non-woven
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material

Definitions

  • This invention relates to a nonwoven material suitable to be used as filter media, and, more particularly, to an essentially pure cellulose nonwoven web formed from essentially continuous filaments and multibonded by merged filaments, hydrogen bonding and the physical intermingling of filaments.
  • This web provides strength, dimensional stability, pore size distribution capable of removing fine particulates and impurities from both liquid and air or gases, a filament size distribution capable of both supplying structural support while still producing fine pore sizes capable of filtering small particulates, capable of holding a sufficient quantity of such particulates to be economically feasible, providing low resistance to fluids passing through the media, and capable of withstanding multiple filtration cycles without losing performance capabilities, and is biodegradable and compostable.
  • essentially pure cellulose shall address the fact that cellulosic moulded bodies, e.g. made according to the lyoceil 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. 4,589,894 teaches the use of two separate meltblown polypropylene layers for filtration.
  • U.S. 5,783,011 teaches the use of novel meltblown nonwovens for filter media.
  • U.S. 4,041 ,203, U.S. 5,073,436, U.S. 5,244,482 and U.S. 5,709,735 disclose the use of spunbond/meltblown/spunbond or SMS composites for filtration.
  • U.S. 5,080,702 teaches the use of two layers, an inner meltblown polypropylene and outer paper layer for vacuum cleaner bag filtration.
  • U.S. 9,309,612 teaches the use of a spunlaid nonwoven with filament diameters between those of spunbond and meltblown nonwovens.
  • U.S. 9,421 ,294 teaches the use of spunlaid, spunlace airlaid, needlepunch and thermal and carded nonwovens for facemask filtration media.
  • U.S. 9,296,176 discloses a nonwoven composite with layers of spunlaid polyolefin on each side of an airlaid pulp layer, for filtration media.
  • U.S. 8,021 ,996 teaches the use of a spunlace nonwoven with partially split bicomponent fibres to maximize small particulate capture while minimizing pressure drop across the media.
  • U.S. 9,498,932 discloses the use of multilayer meltblown synthetic polymers for filtering liquids, while U.S. 9,487,893 teaches the use of spunlaid polymers to attain needed dimensional stability.
  • Nonwoven substrates for use as filter media has been the subject of much research, as the requirements are stringent and demanding.
  • a nonwoven used as filter media must be able to filter small size particulates, must be able to hold a quantity of these particulates, must not have significant pressure drops in fluids passed through them, and must be able to withstand multiple cycles of filtering and cleaning. Compostability would be an advantage for such filter media, to simplify disposal.
  • nonwovens can be used for filter media, including spunlace nonwovens, needlepunch nonwovens, airlaid nonwovens, wetlaid nonwovens and spunlaid nonwovens. All but the last type employ primarily staple or cut fibres, or wood pulp. The last type consists of continuous filaments (either are not remaining as continuous or cut in the manufacturing process). Spunlaid nonwovens based on polypropylene, polyester or nylon are more expensive and not biodegradable or compostable. Spunlace, needlepunch, wetlaid and airlaid nonwovens can rely on cellulosic fibres, but they all share low strength and dimensional stability in prolonged immersion in some fluids and are not as efficient at removing small size particulates.
  • 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.
  • filter media In order to be commercially useful, filter media must be capable of filtering small size particulates ("filtration efficiency"), in large quantities (“loading") for either multiple cycles (filter, clean filter, filter) or long cycle times (“filter media life”) without requiring excessive pressure to force the material to be filtered through the media ("pressure drop"). It must also be capable of enduring long periods of time in various materials to be filtered, as well as potentially high or low temperatures. Biodegradability and/or compostability are also desired.
  • Spunlaid nonwovens can have fine pore size and are dimensionally stable and durable for long times and multiple cycles, but are susceptible to some solvents and high temperatures. They also have high pressure drops across the media and can be expensive. Spunbonds have strength and durability and low pressure drops across media made of them, but large pores which do not filter small particulates well. Meltblowns have fine pore sizes, but are weaker and have high pressure drops. Spunbond/meltblown/spunbond composites or SMS composites combine the filament diameters of coarse, outer layer spunbond with finer diameter inner layer meltblown, with the spunbond contributing strength and coarse particle filtration while the meltblown contributes fine particle and liquid filtration while permitting vapor transmission.
  • Carded, spunlace and airlaid nonwovens usually do not have as fine a pore size distribution as spunlaid, are not as strong or dimensionally stable as spunlaid, nor as durable as spunlaid, but do have lower pressure drops and costs.
  • Wetlaid nonwovens usually do not have the strength, dimensional stability or durability of spunlaid but do have lower costs.
  • the need for a universal filter media material is for it to have the cost, solvent and temperature resistance and pressure drop profile of a staple cellulose fibre or wood pulp based nonwoven with the pore size distribution,
  • the nonwoven web is produced using a spunbond or meltblown die or head to form the continuous filaments, in principle known from the prior art cited above.
  • This material will provide strength, dimensional stability, pore size distribution capable of removing fine particulates and impurities from both liquid and air or gases, a filament size distribution capable of both supplying structural support while still exhibiting fine pore sizes capable of filtering small particulates, capable of holding a sufficient quantity of such particulates to be economically feasible, providing low resistance to fluids passing through the media, and capable of withstanding multiple filtration cycles without losing performance capabilities. Further this material is biodegradable, compostable, made from a sustainable manufacturing process, and is able to qualify for - among others - indirect food contact.
  • This material is capable of filtering small size particulates ("filtration
  • the present invention Compared to nonwoven substrates based on cellulosic fibres, the present invention provides superior strength and dimensional stability, as well a superior durability to multiple filtration cycles, and the ability to filter small particulates.
  • the present invention Compared to nonwoven substrates based on synthetic polymers and fibres, the present invention provides equivalent strength and dimensional stability, small particulate filtration capability, equivalent durability and superior temperature resistance and is both biodegradable and compostable.
  • the nonwoven material according to the invention is further bonded or treated by a hydroentangiement, needlepunch or chemical bonding process to modify the physical properties.
  • This invention can also exist in a multi-layer structure of the same essentially continuous filaments and multibonded by merged filaments, hydrogen bonding and/or the physical intermingling of filaments.
  • each layer can consist of different pore size construction by controlling the filament diameter, the degree of merged filaments and the thickness of each layer.
  • said multi-layer structure it is possible to provide a gradient of decreasing pore size to maximize filtration efficiency and minimize the pressure drop across the filter media.
  • These layers can be produced in a single process where multiple layers are formed on top of one another, or produced in a separate step where the layers are laminated together via bonding processes such as adhesive bonding, hydroentangling,
  • the first cellulosic nonwoven web of the nonwoven material according to the invention is 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.
  • the slower the cooling rate the slower the coagulation rate, and conversely, the faster the cooling rate, the faster the coagulation rate. Therefore, configuration of the filament extension air can directing impact the cooling rate and therefore, impact the coagulation rate, which impacts the achievable amount of merged filament bonding that is possible.
  • 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
  • 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.
  • amine oxide is NMMO.
  • the present invention describes a cellulosic 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 cellulosic 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 comprises a second cellulosic nonwoven web, which is essentially formed of continuous filaments, pulp fiber or staple fiber, is formed on top of the first cellulosic nonwoven web, and subsequently both layers are hydroentangled together.
  • the nonwoven material comprises multiple layers of nonwoven webs, suitable for use as filtration media, wherein at least one layer is essentially pure cellulosic material formed of essentially continuous filaments and is bonded by merged fibers, hydrogen bonding and physical intermingling of filaments and subsequently at least two of these layers are hydroentangled together.
  • all layers within the nonwoven material are essentially pure cellulosic material formed of essentially continuous filaments and are bonded by merged fibers, hydrogen bonding and physical intermingling of filaments and subsequently all of these layers are hydroentangled together.
  • the individual layers within the two- or multilayer nonwoven material are designed to have different pore size construction to impart specific filtration performance efficiencies.
  • the individual layers in the nonwoven material are assembled in a sequence suitable to provide a gradient of decreasing pore size in flow direction to maximize filtration efficiency and minimize the pressure drop across the filter media.
  • Another object of the present invention is the use of the nonwoven material according to the invention for filtration as well as the use of this nonwoven material for the manufacture of a filter media.
  • Another object of the present invention is a filter media which contains a nonwoven material according to the invention.
  • Tensile properties and stiffness of a 50 gsm sample of the product of the invention was compared to a commercial product of same basis weight comprising 100% cellulosic staple fiber (lyocell).
  • Tensile properties were measured using standard method DIN EN 29 073 part 3/ISO 9073-3, although a clamping length of 8cm rather than 20cm was used.
  • the product of invention had comparable tensile strength with the commercial sample but the elongation in both MD and CD was 4 times less than the commercial sample.
  • Stiffness was measured using a 'Handle-o-meter', using standard method WSP 90.3, with 1 ⁇ 4 inch slot width, stainless steel surface, 1000 g beam.
  • Sample size was to 10cm x 10cm. Overall stiffness of the product of the invention was double that of the commercial sample.
  • the product of invention shows less elongation and higher stiffness compared to the commercial sample, it is more able to retain its dimensional structure while under pressure during both liquid and air/gas filtration.
  • a nonwoven web formed from essentially continuous filaments
  • the spunlaid-like cellulose process also referred to as solution-blown cellulose, has the capability to produce a range of filament diameters within a single web formation process.
  • the product of this invention shows a range of pore sizes which enables structural support for the filter media while still exhibiting fine pore sizes capable of filtering small particulates.
  • the media is also capable of holding a sufficient quantity of such particulates to be economically feasible, providing low resistance to fluids passing through the media, and capable of withstanding multiple filtration cycles without losing performance capabilities, and is biodegradable and compostable.
  • a product of the invention comprising multiple layers of the inventive nonwoven in which each layer consists of different filament diameters, and thereby exhibits different pore construction.
  • Layer A is comprised of coarse filaments and coarse filter pores for coarse particle filtration followed by Layer B of fine filaments and fine filter pores for fine particle filtration. This prevents early filter blocking and increases filter lifetime.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

La présente invention concerne un matériau non tissé qui présente une excellente stabilité dimensionnelle et thermique dans une grande variété de liquides, de gaz et d'air pour une utilisation en tant que milieu filtrant, contenant au moins une première bande de non-tissé cellulosique, caractérisé en ce que la bande de non-tissé cellulosique est composée de cellulose essentiellement pure formée de filaments essentiellement continus qui sont multiliés par des filaments fusionnés, une liaison hydrogène et un enchevêtrement physique des filaments. L'invention concerne en outre des matériaux non tissés composites, au moins une bande étant caractérisée en ce qu'elle est composée de cellulose essentiellement pure formée de filaments essentiellement continus qui sont multiliés par des filaments fusionnés, une liaison hydrogène et un enchevêtrement physique des filaments. Les couches individuelles peuvent, ou non, être conçues pour présenter une structure de tailles de pores différentes pour conférer des efficacités de performance de filtration spécifiques et utiliser le matériau non tissé selon l'invention en tant que milieu de filtration, ou produire et utiliser le matériau non tissé selon l'invention pour la fabrication d'un milieu filtrant.
PCT/AT2017/000027 2017-04-03 2017-04-03 Matériau non tissé conçu pour être utilisé en tant que milieu filtrant WO2018184046A1 (fr)

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PCT/AT2017/000027 WO2018184046A1 (fr) 2017-04-03 2017-04-03 Matériau non tissé conçu pour être utilisé en tant que milieu filtrant

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020115141A1 (fr) * 2018-12-05 2020-06-11 Lenzing Aktiengesellschaft Procédé et dispositif de production de non-tissés filé-lié cellulosiques tubulaires
US20200391147A1 (en) * 2018-02-19 2020-12-17 Twe Gmbh & Co. Kg Filter medium
WO2021170609A1 (fr) * 2020-02-24 2021-09-02 Lenzing Aktiengesellschaft Procédé de production de tissu filé-lié
WO2021170608A1 (fr) * 2020-02-24 2021-09-02 Lenzing Aktiengesellschaft Procédé et dispositif pour la production de non-tissé par filage direct
US12286735B2 (en) 2020-02-24 2025-04-29 Lenzing Aktiengesellschaft Method for producing spunbonded fabric

Citations (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4041203A (en) 1972-09-06 1977-08-09 Kimberly-Clark Corporation Nonwoven thermoplastic fabric
GB1580843A (en) * 1976-04-02 1980-12-03 Cartiera Del Sentino Spa Filter boards
US4589894A (en) 1984-04-11 1986-05-20 Minnesota Mining And Manufacturing Co. Disposable filter for a vacuum cleaner
US5073436A (en) 1989-09-25 1991-12-17 Amoco Corporation Multi-layer composite nonwoven fabrics
US5080702A (en) 1990-02-15 1992-01-14 Home Care Industries, Inc. Disposable two-ply filter
US5244482A (en) 1992-03-26 1993-09-14 The University Of Tennessee Research Corporation Post-treatment of nonwoven webs
US5709735A (en) 1995-10-20 1998-01-20 Kimberly-Clark Worldwide, Inc. High stiffness nonwoven filter medium
WO1998007911A1 (fr) 1996-08-23 1998-02-26 Weyerhaeuser Company Fibres lyocellulaires et procede de preparation
WO1998026122A1 (fr) 1996-12-10 1998-06-18 Acordis Fibres (Holdings) Limited Procede de fabrication d'un textile non tisse
US5783011A (en) 1995-05-02 1998-07-21 Memtec America Corporation Method of making filtration media having integrally co-located support and filtration fibers
WO1999047733A1 (fr) 1998-03-16 1999-09-23 Weyerhaeuser Company Fibres lyocel, et compositions pour leur fabrication
WO1999064649A1 (fr) 1998-06-05 1999-12-16 Tencel Limited Procede servant a fabriquer un non-tisse
US6197230B1 (en) 1995-06-26 2001-03-06 Acordis Fibres (Holdings) Limited Process for the preparation of a mixture of cellulosic fibers and microfibers
US6596033B1 (en) 1996-08-23 2003-07-22 Weyerhaeuser Company Lyocell nonwoven fabric and process for making
EP1358369A2 (fr) 2000-12-22 2003-11-05 Lüder Dr.-Ing. Gerking Procedes et dispositifs pour la production de filaments fins sensiblement continus
WO2005106085A1 (fr) 2004-04-26 2005-11-10 Biax Fiberfilm Corporation Appareil, produit et procede pour former des bandes non tissees cellulosiques microfibres
US20070227359A1 (en) * 2001-02-12 2007-10-04 Kyung-Ju Choi Product and Method of Forming a Gradient Density Fibrous Filter
WO2007124521A1 (fr) 2006-04-28 2007-11-08 Lenzing Aktiengesellschaft Produits hydro-enchevêtrés comprenant des fibres de cellulose
WO2007124522A1 (fr) 2006-04-28 2007-11-08 Lenzing Aktiengesellschaft Produit non-tisse obtenu par fusion-soufflage
US20090324926A1 (en) * 2008-06-30 2009-12-31 Weyerhaeuser Co. Nonwoven lyocell fiber webs for filtration
US20100167018A1 (en) * 2008-12-31 2010-07-01 Weyerhaeuser Company Lyocell Web Product
US8012565B2 (en) 2008-03-31 2011-09-06 Weyerhaeuser Nr Company Lyocell nonwoven webs
US8021996B2 (en) 2008-12-23 2011-09-20 Kimberly-Clark Worldwide, Inc. Nonwoven web and filter media containing partially split multicomponent fibers
US8191214B2 (en) 2008-12-31 2012-06-05 Weyerhaeuser Nr Company Method for making lyocell web product
US8668758B2 (en) 2006-05-16 2014-03-11 Polyester Fibers, Llc Trackified air filtration media and a self-supporting filter having improved stiffness and foldability
JP2014133198A (ja) * 2013-01-09 2014-07-24 Kureha Ltd 不織布濾材
EP2212456B1 (fr) 2007-11-07 2015-07-22 Lenzing Aktiengesellschaft Procédé de production d'un produit hydrolié comprenant des fibres de cellulose
US9296176B2 (en) 2009-07-20 2016-03-29 Suominen Corporation High cellulose content, laminiferous nonwoven fabric
US9309612B2 (en) 2014-05-07 2016-04-12 Biax-Fiberfilm Process for forming a non-woven web
US9421294B2 (en) 2012-03-07 2016-08-23 Toagosei Co., Ltd. Deodorizing mask
US9487893B2 (en) 2009-03-31 2016-11-08 3M Innovative Properties Company Dimensionally stable nonwoven fibrous webs and methods of making and using the same
US9498932B2 (en) 2008-09-30 2016-11-22 Exxonmobil Chemical Patents Inc. Multi-layered meltblown composite and methods for making same

Patent Citations (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4041203A (en) 1972-09-06 1977-08-09 Kimberly-Clark Corporation Nonwoven thermoplastic fabric
GB1580843A (en) * 1976-04-02 1980-12-03 Cartiera Del Sentino Spa Filter boards
US4589894A (en) 1984-04-11 1986-05-20 Minnesota Mining And Manufacturing Co. Disposable filter for a vacuum cleaner
US5073436A (en) 1989-09-25 1991-12-17 Amoco Corporation Multi-layer composite nonwoven fabrics
US5080702A (en) 1990-02-15 1992-01-14 Home Care Industries, Inc. Disposable two-ply filter
US5244482A (en) 1992-03-26 1993-09-14 The University Of Tennessee Research Corporation Post-treatment of nonwoven webs
US5783011A (en) 1995-05-02 1998-07-21 Memtec America Corporation Method of making filtration media having integrally co-located support and filtration fibers
US6197230B1 (en) 1995-06-26 2001-03-06 Acordis Fibres (Holdings) Limited Process for the preparation of a mixture of cellulosic fibers and microfibers
US5709735A (en) 1995-10-20 1998-01-20 Kimberly-Clark Worldwide, Inc. High stiffness nonwoven filter medium
US7067444B2 (en) 1996-08-23 2006-06-27 Weyerhaeuser Company Lyocell nonwoven fabric
US6596033B1 (en) 1996-08-23 2003-07-22 Weyerhaeuser Company Lyocell nonwoven fabric and process for making
WO1998007911A1 (fr) 1996-08-23 1998-02-26 Weyerhaeuser Company Fibres lyocellulaires et procede de preparation
WO1998026122A1 (fr) 1996-12-10 1998-06-18 Acordis Fibres (Holdings) Limited Procede de fabrication d'un textile non tisse
US6358461B1 (en) 1996-12-10 2002-03-19 Tencel Limited Method of manufacture of nonwoven fabric
WO1999047733A1 (fr) 1998-03-16 1999-09-23 Weyerhaeuser Company Fibres lyocel, et compositions pour leur fabrication
WO1999064649A1 (fr) 1998-06-05 1999-12-16 Tencel Limited Procede servant a fabriquer un non-tisse
EP1093536B1 (fr) 1998-06-05 2003-10-01 Tencel Limited Non-Tisse et procede servant a le fabriquer
EP1358369A2 (fr) 2000-12-22 2003-11-05 Lüder Dr.-Ing. Gerking Procedes et dispositifs pour la production de filaments fins sensiblement continus
US20070227359A1 (en) * 2001-02-12 2007-10-04 Kyung-Ju Choi Product and Method of Forming a Gradient Density Fibrous Filter
WO2005106085A1 (fr) 2004-04-26 2005-11-10 Biax Fiberfilm Corporation Appareil, produit et procede pour former des bandes non tissees cellulosiques microfibres
WO2007124521A1 (fr) 2006-04-28 2007-11-08 Lenzing Aktiengesellschaft Produits hydro-enchevêtrés comprenant des fibres de cellulose
WO2007124522A1 (fr) 2006-04-28 2007-11-08 Lenzing Aktiengesellschaft Produit non-tisse obtenu par fusion-soufflage
EP2013390A1 (fr) 2006-04-28 2009-01-14 Lenzing Aktiengesellschaft Produits hydro-enchevêtrés comprenant des fibres de cellulose
EP2013390B1 (fr) 2006-04-28 2015-08-19 Lenzing Aktiengesellschaft Produits hydro-enchevêtrés comprenant des fibres de cellulose
US8668758B2 (en) 2006-05-16 2014-03-11 Polyester Fibers, Llc Trackified air filtration media and a self-supporting filter having improved stiffness and foldability
EP2212456B1 (fr) 2007-11-07 2015-07-22 Lenzing Aktiengesellschaft Procédé de production d'un produit hydrolié comprenant des fibres de cellulose
US8012565B2 (en) 2008-03-31 2011-09-06 Weyerhaeuser Nr Company Lyocell nonwoven webs
US20090324926A1 (en) * 2008-06-30 2009-12-31 Weyerhaeuser Co. Nonwoven lyocell fiber webs for filtration
US8263506B2 (en) 2008-06-30 2012-09-11 Weyerhaeuser Nr Company Nonwoven lyocell fiber webs for filtration
US9498932B2 (en) 2008-09-30 2016-11-22 Exxonmobil Chemical Patents Inc. Multi-layered meltblown composite and methods for making same
US8021996B2 (en) 2008-12-23 2011-09-20 Kimberly-Clark Worldwide, Inc. Nonwoven web and filter media containing partially split multicomponent fibers
US20100167018A1 (en) * 2008-12-31 2010-07-01 Weyerhaeuser Company Lyocell Web Product
US8318318B2 (en) 2008-12-31 2012-11-27 Weyerhaeuser Nr Company Lyocell web product
US8191214B2 (en) 2008-12-31 2012-06-05 Weyerhaeuser Nr Company Method for making lyocell web product
US9487893B2 (en) 2009-03-31 2016-11-08 3M Innovative Properties Company Dimensionally stable nonwoven fibrous webs and methods of making and using the same
US9296176B2 (en) 2009-07-20 2016-03-29 Suominen Corporation High cellulose content, laminiferous nonwoven fabric
US9421294B2 (en) 2012-03-07 2016-08-23 Toagosei Co., Ltd. Deodorizing mask
JP2014133198A (ja) * 2013-01-09 2014-07-24 Kureha Ltd 不織布濾材
US9309612B2 (en) 2014-05-07 2016-04-12 Biax-Fiberfilm Process for forming a non-woven web

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200391147A1 (en) * 2018-02-19 2020-12-17 Twe Gmbh & Co. Kg Filter medium
WO2020115141A1 (fr) * 2018-12-05 2020-06-11 Lenzing Aktiengesellschaft Procédé et dispositif de production de non-tissés filé-lié cellulosiques tubulaires
CN113166990A (zh) * 2018-12-05 2021-07-23 连津格股份公司 用于制造管形的纤维素的纺粘无纺织物的方法和设备
WO2021170609A1 (fr) * 2020-02-24 2021-09-02 Lenzing Aktiengesellschaft Procédé de production de tissu filé-lié
WO2021170608A1 (fr) * 2020-02-24 2021-09-02 Lenzing Aktiengesellschaft Procédé et dispositif pour la production de non-tissé par filage direct
CN115103936A (zh) * 2020-02-24 2022-09-23 兰精股份公司 用于制造纺粘型无纺织物的方法和装置
US12247322B2 (en) 2020-02-24 2025-03-11 Lenzing Aktiengesellschaft Method for producing spunbonded fabric
US12286735B2 (en) 2020-02-24 2025-04-29 Lenzing Aktiengesellschaft Method for producing spunbonded fabric

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