EP3604652A1 - Non-tissé, utilisation du non-tissé et chiffon, toile de séchage ainsi que masque pour le visage comportant du non-tissé - Google Patents

Non-tissé, utilisation du non-tissé et chiffon, toile de séchage ainsi que masque pour le visage comportant du non-tissé Download PDF

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Publication number
EP3604652A1
EP3604652A1 EP18186541.1A EP18186541A EP3604652A1 EP 3604652 A1 EP3604652 A1 EP 3604652A1 EP 18186541 A EP18186541 A EP 18186541A EP 3604652 A1 EP3604652 A1 EP 3604652A1
Authority
EP
European Patent Office
Prior art keywords
nonwoven fabric
equal
opacity
less
fabric according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP18186541.1A
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German (de)
English (en)
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EP3604652B1 (fr
Inventor
Katharina Mayer
Mirko Einzmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lenzing AG
Original Assignee
Lenzing AG
Chemiefaser 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, Chemiefaser Lenzing AG filed Critical Lenzing AG
Priority to ES18186541T priority Critical patent/ES2964861T3/es
Priority to EP18186541.1A priority patent/EP3604652B1/fr
Priority to TW108124862A priority patent/TW202024420A/zh
Priority to CN201980051134.7A priority patent/CN112513357B/zh
Priority to US17/263,314 priority patent/US20210164138A1/en
Priority to KR1020217005698A priority patent/KR20210035876A/ko
Priority to BR112020026898-4A priority patent/BR112020026898A2/pt
Priority to JP2021505742A priority patent/JP7477241B2/ja
Priority to PCT/EP2019/070035 priority patent/WO2020025440A1/fr
Publication of EP3604652A1 publication Critical patent/EP3604652A1/fr
Application granted granted Critical
Publication of EP3604652B1 publication Critical patent/EP3604652B1/fr
Priority to US18/387,303 priority patent/US20240068140A1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D44/00—Other cosmetic or toiletry articles, e.g. for hairdressers' rooms
    • A45D44/002—Masks for cosmetic treatment of the face
    • 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
    • D01D5/20—Formation of filaments, threads, or the like with varying denier along their length
    • 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
    • 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
    • D01F2/06—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from viscose
    • 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
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/02—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments
    • 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
    • D04H3/02—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments
    • D04H3/04—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments in rectilinear paths, e.g. crossing at right angles
    • D04H3/045—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments in rectilinear paths, e.g. crossing at right angles for net manufacturing
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D2200/00—Details not otherwise provided for in A45D
    • A45D2200/10—Details of applicators
    • A45D2200/1009—Applicators comprising a pad, tissue, sponge, or the like
    • A45D2200/1027—Tissues, i.e. thin applicator sheets
    • 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
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2501/00—Wearing apparel
    • D10B2501/04—Outerwear; Protective garments
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2503/00—Domestic or personal
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2509/00—Medical; Hygiene
    • D10B2509/02—Bandages, dressings or absorbent pads
    • D10B2509/026—Absorbent pads; Tampons; Laundry; Towels

Definitions

  • the invention relates to a nonwoven fabric with a network of molded articles, the nonwoven fabric having a specific opacity of greater than or equal to 1.0% m 2 / g in the dry state.
  • the invention relates to uses of the nonwoven fabric and to a wipe, a dryer sheet and a face mask containing the nonwoven fabric.
  • Nonwovens also known as nonwovens or non-woven textiles
  • the unique properties and low manufacturing costs make them an ideal substrate for disposable or disposable products in hygiene applications such as for wipes, wet wipes, face masks, diapers and others.
  • customers place demands on high opacity, sufficient mechanical strength, flexibility, thickness and high water absorption of the products.
  • high opacity is of great importance to the end customer, since nonwoven products with too little opacity tend to be associated with low tear strength and low reliability.
  • the desire for products with a low basis weight is steadily increasing.
  • a high opacity can enable a further reduction in the basis weight and still give the end customer the feeling of tear resistance and reliability.
  • nonwovens with a high basis weight usually also have a high opacity
  • the manufacture of nonwovens with a low basis weight in particular in the range below about 35 g / m 2 , and at the same time high opacity, poses great challenges for the manufacturers.
  • Simple hydroentangled nonwovens (as from the EP 0473325 A1 known) can only be manufactured with great effort in low basis weights and accordingly have a strongly irregular structure and thus also opacity. Without appropriate modifications and additives, these can often not achieve the necessary or desired opacity with low basis weights.
  • Nonwovens which are made from thermoplastic synthetic polymers in a meltblown or spunbond process.
  • Nonwovens comprising such a spunbonded nonwoven require a multilayer structure in order to be able to meet the requirements for strength and stability.
  • the individual layers of different nonwovens are glued or fused together or provided with an additional coating in order to achieve the desired opacity of the nonwoven.
  • such nonwovens generally have a low water absorption capacity due to the synthetic polymer filaments and a low flexibility due to the multilayer or coated layer structure.
  • nonwovens containing synthetic polymers are not biodegradable, which is why their use in disposable or disposable products should be avoided.
  • the nonwovens according to the invention can be produced from a spinning solution containing cellulose according to a process for the direct production of nonwovens.
  • Such methods are, for example, from the prior art ( WO 98/26122 A1 . WO 99/47733 A1 . WO 98/07911 A1 . WO 97/01660 A1 . WO 99/64649 A1 . WO 05/106085 A1 . EP 1 358 369 A1 , and EP 2 013 390 A1 ) known.
  • the preparation and extrusion of the spinning solution in such a process is preferably carried out by a direct dissolving process such as the Lyocell process.
  • Cellulose is directly dissolved in an aqueous solution of an amine oxide (preferably NMMO - N-methylmorpholine-N-oxide) and formed into a spinnable spinning solution.
  • the spinning solution is then extruded through suitable spinnerets and the cellulose dissolved in the extruded spinning solution is precipitated with a coagulant to form shaped articles.
  • an amine oxide water or a mixture of water and amine oxide is particularly suitable as a coagulant.
  • the production of such spinning solutions by the Lyocell process for the production of nonwovens is, for example, from WO 98/26122 A1 . US 7,067,444 B2 or US 8,012,565 B1 known.
  • the object of the invention is therefore to create a nonwoven fabric with a low basis weight which is simple to produce and has a high specific opacity without special modifications.
  • the shaped bodies are regenerated cellulosic shaped bodies and are cohesively connected to one another via nodes to form the network, and wherein the regenerated cellulosic shaped bodies comprise individual filament sections that extend between nodes and vary in diameter along their longitudinal extent and over at least 90% of their longitudinal extent have a diameter of 15 ⁇ m or less.
  • the moldings are regenerated cellulosic moldings, biodegradable nonwovens can be created, which are also in one simple and reliable processes can be produced inexpensively. If the molded bodies are also cohesively connected to one another via nodes to form the network, a particularly dimensionally stable fleece can be created, which enables high tear strength with a low basis weight.
  • the opacity of the nonwoven can advantageously be greatly increased if the regenerated cellulosic shaped bodies comprise individual filament sections which extend between nodes and which vary in diameter along their longitudinal extent and have a diameter of less than or equal to 15 ⁇ m over at least 90% of their longitudinal extent.
  • the individual filament sections which vary in diameter can provide particularly high and advantageous light scattering and thus increase the opacity of the entire nonwoven fabric.
  • the single filament sections with fine diameters enable a particularly high surface coverage with a high number of filaments per surface, which in turn is conducive to a homogeneous opacity of the nonwoven fabric.
  • the very fine diameters of less than or equal to 15 ⁇ m enable the volume to be increased and thus the weight per unit area to be reduced without sacrificing opacity.
  • a nonwoven fabric with a low basis weight and a specific opacity of greater than or equal to 1.0% m 2 / g can thus be created.
  • the nature of the manufacturing process means that the formation of individual individual filament sections with diameters greater than 15 ⁇ m is unavoidable.
  • outliers have no negative influence on the advantageous properties of the nonwovens according to the invention, as long as the individual filament sections have a diameter of less than or equal to 15 ⁇ m over at least 90% of their longitudinal extent.
  • the individual filament sections can also have a diameter of less than or equal to 15 ⁇ m over at least 95% of their longitudinal extent.
  • the integral connection between the shaped bodies in the nonwoven fabric is understood to mean a cohesive connection between the cellulose molecules of the regenerated cellulosic shaped bodies.
  • Such a connection can be achieved, in particular, by touching or bringing into contact molded bodies which have not yet been completely coagulated (or by extruded spinning solution) after their extrusion, the cellulose molecules forming the integral connection via cohesion.
  • the opacity of the nonwoven fabric is determined in a dry state with a natural moisture content after conditioning at 23 ° C ( ⁇ 2 ° C) and 50% ( ⁇ 5%) relative air humidity for 24 hours.
  • the properties of a nonwoven fabric of the aforementioned type can advantageously be improved further if the regenerated cellulosic molded articles comprise multifilament sections which extend between nodes and which consist of a plurality of individual filament sections which are connected to one another in a materially integral manner and are essentially parallel.
  • the individual filaments connected to the multifilament can thus help stabilize the nonwoven and increase its strength.
  • the multifilament sections have a diameter of less than or equal to 100 ⁇ m over at least 90% of their longitudinal extent, it can further be ensured that the nonwoven fabric has a homogeneous appearance essentially without annoying visible thickenings.
  • a network of shaped bodies can thus be created in the nonwoven fabric, which at the same time has thicker multifilament sections for the formation of structure and strength and thinner individual filament sections for increasing the opacity.
  • Such a network can have an essentially multimodal distribution of the shaped body diameters.
  • the multifilament sections can be formed from 2 or more individual filaments after the extrusion of the shaped bodies.
  • the multifilament sections are therefore not a bundle of individual filaments, but rather a chemically and physically inseparable unit.
  • a nonwoven fabric can be provided which has less abrasion and can also build up a better contact surface. For example, contact with the skin or with a surface can be improved.
  • the invention can also be distinguished in a special way if the nonwoven is essentially free of matting agents and colorants.
  • matting agents such as titanium dioxide or zinc oxide
  • the use of conventional matting agents, such as titanium dioxide or zinc oxide, requires very special processing conditions in the production of the moldings, since these agents are very difficult to disperse in a spinning solution due to their strong affinity for particle formation.
  • the matting agent particles create imperfections in the shaped bodies, which can lead to increased brittleness and reduced strength in the shaped body. This in turn poses a problem for the downstream processing industry, since the reduced strength or higher brittleness means that complex or costly processing steps are required.
  • matting agents are expensive and have a negative impact on the cost efficiency of nonwoven production.
  • nonwoven fabric with high opacity without the use of matting agents and other colorants.
  • nonwovens according to the invention with a network of regenerated cellulosic molded articles, having single filament sections that have a diameter of less than or equal to 15 ⁇ m over at least 90% of their longitudinal extent, have a very high specific opacity without the use of matting agents. Nonwovens can thus be provided inexpensively and easily.
  • the nonwoven fabric can preferably consist essentially exclusively of cellulose.
  • Such a nonwoven fabric can differ from nonwoven fabrics based on synthetic polymers by a good one distinguish biodegradability, which is of particular importance for the sustainable use in disposable or disposable products such as hygiene articles.
  • purely cellulosic products have a significantly increased water absorption capacity compared to synthetic polymers, which is required, for example, in hygiene articles.
  • a nonwoven fabric with a particularly low ecological footprint can be created in this way.
  • the regenerated cellulosic shaped bodies are solution-spun cellulosic shaped bodies.
  • Solution-spun shaped bodies are shaped bodies which are formed by extrusion of a spinning solution through spinnerets and subsequent coagulation, the spinning solution being produced by directly dissolving cellulose in a solvent (without prior chemical conversion of the cellulose).
  • the moldings are preferably produced by a Lyocell process, NMMO (N-methylmorpholine-N-oxide) being used as the solvent.
  • Solution-spun cellulosic molded articles advantageously have, among other things, increased strength compared to other regenerated cellulosic molded articles (such as viscose). In the case of Lyocell moldings in particular, these advantages can be achieved by an environmentally friendly and cost-effective process.
  • the properties of the nonwoven fabric with regard to water absorption and strength can be further improved if the individual filament sections have a solid, in particular rounded, cross section.
  • a nonwoven fabric with a very high specific opacity can be provided if the nonwoven fabric is essentially free of binders or adhesives.
  • the nonwovens according to the invention can dispense with the use of such substances.
  • nonwovens in particular which are used directly on the skin or in sensitive areas, it is of great importance that these nonwovens are free of substances which can potentially cause skin irritation or allergic reactions.
  • Adhesives and binders in particular are known to lead to such irritation or allergic reactions and should therefore be avoided in the event of skin contact.
  • According to the invention can a skin-friendly nonwoven fabric with a low risk of irritation and allergy is created, which does not suffer any loss in opacity.
  • the nonwoven is also essentially free of copper and / or nickel, the advantages mentioned above with regard to low risk of irritation and allergy can be further improved, since it is known that even small residues of metals such as copper or nickel can lead to incompatibilities.
  • the nonwoven has a copper content of less than 5 ppm and / or a nickel content of less than 2 ppm in order to minimize the risk of irritation.
  • the specific opacity of the nonwoven can be further improved if the individual filament sections have a diameter of less than 10 ⁇ m, in particular less than or equal to 7 ⁇ m, over at least 90% of their longitudinal extent. Due to the very fine diameters of the individual filament sections of less than or equal to 10 ⁇ m, or in a further preferred embodiment of less than or equal to 7 ⁇ m, a particularly advantageous increase in the volume and simultaneous reduction in the basis weight can take place without reducing the specific opacity of the nonwoven.
  • the individual filament sections have an average diameter of greater than or equal to 1 ⁇ m and less than or equal to 8 ⁇ m. This creates a narrow diameter distribution of the individual filament sections, which on the one hand can guarantee a uniformly high specific opacity and on the other hand ensures high stability and strength in the nonwoven fabric.
  • the nonwoven has approximately the preferred diameters of the individual filament sections according to the invention, then it can have a specific opacity of greater than or equal to 1.2% .m 2 / g, or in a particularly advantageous embodiment of greater than or equal to 1.5% .m 2 / g , exhibit.
  • Nonwovens with such a high specific opacity can achieve excellent opacity even with very low basis weights.
  • the invention can be particularly advantageous if the nonwoven fabric has a basis weight of less than or equal to 70 g / m 2 .
  • the nonwoven fabric has a basis weight of less 35 g / m 2 , particularly preferably less than or equal to 20 g / m 2 .
  • a particularly light and fine nonwoven fabric with excellent opacity can thus be created.
  • the nonwoven fabric can also be advantageous if it contains properties and surface finishing or changing substances or processing aids in a content of max. 1% by weight, in particular of max. 0.5% by weight.
  • agents can be, for example, softening agents, antistatic agents, hydrophobizing agents or agents, which interact with lotions and thus, for example, facilitate the delivery of an active ingredient.
  • additives can be selected, for example, from the group comprising: fatty alcohol ether sulfates, phosphoric acid esters, alkyl ketene dimers, alkenyl succinic anhydride, aminopolysiloxane, ester quats, fatty acid polyglycol esters, aluminum sulfate, glycidyl ether or similar or equivalent substances.
  • the invention can also be distinguished in a wipe, in a face mask and in a dryer sheet, which is a nonwoven fabric according to the invention according to one of claims 1 to 16.
  • a wipe, such a face mask or such a dryer sheet may be advantageously carried out by an excellent specific opacity of greater than or equal 1.0% ⁇ m 2 / g, and in another embodiment of greater than or equal to 1.2% ⁇ m 2 / g, or in a very advantageous embodiment of greater than or equal to 1.5% m 2 / g.
  • Such wipes, face masks and dryer sheets can also have a basis weight of less than or equal to 70 g / m 2 , or in a further advantageous embodiment of less than or equal to 35 g / m 2 , in particular less than or equal to 20 g / m 2 , and thus a product provide high opacity and low basis weight.
  • Such a wipe can be used for a large number of different applications, for example in the hygiene, medical or sanitary field, and give the user a feeling of high reliability with regard to strength and water absorption.
  • a low basis weight can also be particularly suitable for sensitive applications, such as for cleaning measuring devices or optical devices such as Glasses, lenses or binoculars.
  • a face mask described above can be advantageous for hygienic applications, for example, whereby the low basis weight can ensure excellent flexibility and adaptability of the face mask to the facial contours of the user and the high specific opacity a versatile, non-transparent substrate for a large number of active ingredients, e.g. for cosmetic treatment of the facial skin.
  • Such a dryer sheet according to the invention can be suitable for use in tumble dryers and can convey a high level of reliability due to the high specific opacity.
  • a lotion can contain active ingredients for numerous applications and thus make it easy to use.
  • a wipe or a face mask can be impregnated with a cleaning or care lotion, which can be applied directly to the skin or to surfaces.
  • a dryer sheet can be used, for example be impregnated with a lotion, which is released during the drying process and cares for the laundry.
  • a previously mentioned lotion is essentially not water-based.
  • the water contained in a water-based lotion is absorbed by the nonwoven fabric and can significantly reduce the specific opacity compared to the dry state.
  • a preferred lotion can be fat or wax-based, for example, and thus ensure a dry product with a high specific opacity.
  • Such a wax-based lotion can be present in a wipe, for example as a polish, which is released onto a surface during the polishing process.
  • the lotion can melt, for example after contact with the skin, through the body temperature and thus be released to the skin.
  • a laundry care agent can be present, for example, as a wax-based lotion, which is released to the laundry during the drying process by means of an elevated temperature.
  • a process mentioned at the outset for the direct production of nonwovens from a cellulose-containing spinning solution can be used to produce the nonwovens according to the invention.
  • the spinning solution is preferably produced by a direct dissolving process, in particular the Lyocell process, and extruded through spinnerets.
  • an aqueous solution of NMMO or another amine oxide is used as the solvent.
  • water is used as a coagulant to precipitate the cellulose and to form the shaped bodies after the extrusion of the spinning mass.
  • regenerated cellulosic shaped bodies are thus formed, which are connected to one another to form a network of shaped bodies.
  • the shape and geometry of the shaped bodies formed can be strongly controlled by the process parameters such as the amount and time of the application of the coagulation liquid and the speed of the (blowing) air flow.
  • the time at which the coagulation liquid is applied strongly influences the formation of cohesive connections between individual filaments of the extruded spinning solution. For example, it has been found that the early application of coagulation liquid in the vicinity of the spinneret suppresses the formation of multifilaments and a high content of individual filaments in the end product is obtained.
  • filaments of the extruded spinning solution can touch in the blown air stream and bond cohesively to form a multifilament, since the cellulose has not yet precipitated and thus due to cohesion between the cellulose -Molecules of the individual filaments a permanent connection, which can no longer be released without being destroyed, is created.
  • This cohesion is particularly possible if the filaments from extruded spinning solution still contain solvents and have not yet been coagulated.
  • the individual filaments and multifilaments formed can then cross and touch in the blown air stream or in the formation of the nonwoven in step d) and thus create nodes between the filaments.
  • the individual filament sections are then cohesively connected to one another via the nodes and thus form the network of shaped bodies which makes up the nonwoven according to the invention.
  • the filaments can also cross and overlap without one Form node and thus form a three-dimensional network of shaped bodies.
  • the speed at which the nonwoven is drawn off on the belt conveyor or drum can also be varied, and the basis weight of the nonwoven can thus be influenced. It has surprisingly been found that increasing the take-off speed on the one hand increases the areal production output and, on the other hand, a nonwoven fabric with a low basis weight and high specific opacity can be achieved. The latter is due in particular to the individual filament sections in the nonwoven fabric, which have a diameter of less than or equal to 15 ⁇ m over 90% of their longitudinal extent. The method can thus be used to produce an inexpensive nonwoven fabric with particularly advantageous properties with regard to opacity.
  • multi-layer nonwovens By connecting several spinnerets in series in the process, multi-layer nonwovens can also be created, the networks of regenerated cellulosic molded articles being placed on top of one another in the different layers and possibly being subsequently consolidated, for example by water jets.
  • Fig. 1 shows a schematic representation of a nonwoven fabric 100 according to a first embodiment, which has a network 1 of regenerated cellulosic molded bodies 2.
  • the molded bodies 2 are integrally connected to one another at nodes 3 to form the network 1.
  • the molded bodies 2 have individual filament sections 4 in the network 1, each of which extends between nodes 3.
  • the shaped bodies 2 also have multifilament sections 5 which, like the single filament sections 4, extend between nodes 3 or are connected to one another to form the network 1 of molded bodies 2.
  • the individual filament sections 4 can in this case optionally be connected to other individual filament sections 4 or to multifilament sections 5 at the nodes 3.
  • the nonwoven fabric 100 has a specific opacity of greater than or equal to 1.0% m 2 / g.
  • this specific opacity can be dependent on the process parameter and the basis weight range up to 1.2% ⁇ m 2 / g or particularly preferably up to 1.5% ⁇ m 2 / g.
  • Fig. 3 approximately shows a scatter diagram 50, the x-axis 51 representing the basis weight in g / m 2 and the y-axis 52 representing the specific opacity in [% ⁇ m 2 / g].
  • the straight lines 53, 54 and 55 each represent the lower limit for a specific opacity of 1.0% ⁇ m 2 / g, 1.2% ⁇ m 2 / g and 1.5% ⁇ m 2 / g vertical straight lines 56, 57 and 58 each stand for the limit values of the basis weight of 70 g / m 2 , 35 g / m 2 and 20 g / m 2 .
  • the measuring points 60 each stand for an embodiment B1 to B7 of the present invention.
  • the measuring points 61, 62, 63 and 64 stand for the comparative measurements V1 to V4. The details of the measuring points 60 to 64 are explained in more detail in the description of the examples.
  • the single filament sections 4 according to the embodiment in FIG Fig. 1 have a variable, varying diameter 7 along their longitudinal extent 6.
  • the diameters 7 of the individual filament sections 4 are at most 15 ⁇ m along at least 90% of the longitudinal extent 6 of the individual filament sections 4.
  • the individual filament sections 4 have an average diameter 7 of between 1 ⁇ m and 8 ⁇ m along their longitudinal extension 6.
  • the diameter 7 of the individual filament sections 4 can be a maximum of 10 ⁇ m over at least 90% of their longitudinal extent 6, or a maximum of 7 ⁇ m in a particularly advantageous embodiment. Due to the stretching of the extruded spinning solution in the blown air stream at high speed and turbulent flow, the shaped bodies are given a diameter 7 that varies over their longitudinal extent 6.
  • the multifilament sections 5 formed by connecting several filaments in the blown air stream therefore also have a diameter 9 that varies over their longitudinal extent 8.
  • the multifilament sections 5 have a diameter of less than or equal to 100 ⁇ m over at least 90% of their longitudinal extent 8.
  • the multifilament sections 5 are formed by the integral connection of individual filaments in the blown air stream and are thus essentially composed of a plurality of individual filament sections 4, these being intrinsically inextricably linked to one another via cohesion of the cellulose molecules.
  • the multifilament sections 5 are therefore not to be regarded as a strand of parallel individual filament sections 4, but rather as a single one Multifilament section 5, which is caused by connecting several filaments.
  • Fig. 2 shows an electron microscope image in 250 times magnification of a nonwoven fabric 101 according to the invention.
  • the nonwoven fabric 101 has as before for Fig. 1 described the network 1 from cellulosic shaped bodies 2, which are connected via nodes 3 and consist of individual filament sections 4 and multifilament sections 5.
  • the regenerated cellulosic moldings 2 in the nonwovens 100 and 101 according to the Fig. 1 and 2 form an endless network 1, with essentially no filament ends of the shaped bodies 2 being visible.
  • the individual filaments are bonded to one another, so that any ends of the filaments are connected to other filaments and form a node 3.
  • no loose filament ends are identified.
  • further post-treatment steps of the nonwoven fabric 100, 101 such as an additional water jet consolidation, filament ends are detached from the network 1 and are thus loosely present in the nonwoven fabric.
  • the moldings 2 of the nonwoven fabric 101 are solution-spun cellulosic moldings 2 and were produced from a spinning solution containing cellulose, water and NMMO by the Lyocell process. After the cellulose has precipitated and the nonwoven fabric 101 has been washed, a nonwoven fabric 101 according to the invention is obtained which, apart from unavoidable impurities, consists exclusively of cellulose. Furthermore, the nonwoven fabric 101 has no matting agents and colorants, which gives it excellent strength and stability. In addition, the nonwoven fabric 101 is free of adhesives or binders, so that the mechanical flexibility of the nonwoven fabric 101 is not adversely affected. In addition, the nonwoven fabric 101 has good skin compatibility, since it is free of metallic residues, in particular of copper and nickel.
  • the nonwoven fabric 100, 101 can have a plurality of interconnected layers, but this has not been shown in the figures.
  • the connection of the layers can be cohesive Cohesion between the cellulose molecules of the shaped bodies 2, or, for example, positively and / or non-positively by mechanical entanglement of the shaped bodies 2 - for example in the course of water jet consolidation (hydroentanglement).
  • the nonwoven fabric 100 according to the invention is particularly suitable for producing a wipe 200, a face mask 300 and a dryer sheet 400, the nonwoven fabric 100 having a specific opacity of greater than or equal to 1.0% gm -2 .
  • a wipe 200 which has a previously described nonwoven fabric 100 according to the invention.
  • the nonwoven fabric 100 is impregnated with a lotion 210 which at least partially penetrates into the nonwoven fabric 100 and forms a penetration area 215.
  • Lotion 210 may contain a solvent such as water, but is preferably oil, fat, or wax-based and thus essentially free of water.
  • a wipe 200 can equally be suitable for hygienic use and for treating surfaces
  • a dryer sheet 400 is shown, which also has a nonwoven fabric 100 according to the invention.
  • a lotion 410 is in turn applied to the nonwoven fabric 100.
  • the lotion 410 can soak into the structure of the nonwoven fabric 100 and wet it, but this is not shown in the figures.
  • the nonwoven fabric 100 can be wholly or partially wetted by the lotion 410.
  • Lotion 400 is preferably free of aqueous solutions and is released to the laundry contained therein at elevated temperature, for example during a drying process in a tumble dryer.
  • Fig. 8 finally shows a face mask 300, which has a nonwoven fabric 100 as the base carrier and is coated on the inside (facing the face of the carrier) with a lotion 310.
  • the lotion 310 is preferably such that it can be detached from the nonwoven fabric 100 by the skin temperature of the wearer and is released to the skin.
  • the face mask 300 also has a plurality of cutouts 320 in order to adapt easily to the face of the wearer.
  • a 10 x 10 cm sample is randomly taken from the nonwoven to be measured and conditioned for 24 hours at 23 ° C ( ⁇ 2 ° C) and 50% ( ⁇ 5%) relative humidity before carrying out the measurement. After conditioning, the sample is weighed and the basis weight is determined in g / m 2 .
  • a Konica Minolta Inc. spectrophotometer CM-600d was equipped as a measuring device for all measurements with a measuring head attachment for opacity measurements (Konica Minolta, not glazed, plastic, CM-A180 target mask 8 mm (w / o plate)) and the device with the black standard (Konica Minolta Inc., zero calibration tube CM-A182) and calibrated with the white standard (Konica Minolta Inc., CM-A177).
  • an opacity measurement card with a black and a white area (TQC test chart, A4 format, Art. No. VF2345) is used.
  • Fig. 4 shows a schematic representation of a sample 70 which is made from a nonwoven fabric 100 according to the invention by cutting or punching out.
  • the sample 70 has edge lengths 71, 72 of 10 cm.
  • the points 73, 74, 75, 76 and 77, at which the measurement points 1 to 5 are recorded, are located in the corners and in the middle of the sample 70.
  • the sample 70 is positioned over the black area 81 of the opacity measurement card 80 and the measurement points 1 to 5 are determined for the reflection of the sample over black. Then the sample 70 is positioned over the white area 82 of the opacity measurement card 80 and the recording of the measurement points 1 to 5 is repeated for the reflection of the sample over white.
  • opacity a ⁇ t % 100 ⁇ reflection u ⁇ over black / reflection u ⁇ about white .
  • reflection over black stands for the reflection of the sample over the black opacity measurement card background at a wavelength of 570 nm, and vice versa reflection denotes the reflection of the sample over the white opacity measurement card background at a wavelength of 570 nm.
  • the specific opacity stands for the opacity normalized by the weight per unit area of the sample.
  • a 1 cm ⁇ 1 cm sample 90 was taken randomly from the fleece and conditioned for 24 hours at 23 ° C. ( ⁇ 2 ° C.) and 50% ( ⁇ 5%) relative air humidity before the measurement was carried out ,
  • the sample was 90, as in Fig. 5 shown, placed on a transparent sample holder 91 and covered with a cover glass 92.
  • the Cover glass 92 was weighted with a metal frame 93 (with a mass of 62.6 g).
  • the metal frame 93 has a window 94 for viewing through the cover glass 92 onto the sample 90.
  • a sample photograph of the sample 90 is thus taken in a light microscope in black and white transmitted light at 100 ⁇ magnification.
  • a 1 mm x 1 mm square 95 is randomly selected from the sample holder and two diagonals 96, 97 are drawn into this square 95. Those individual filament sections 98 which cut the diagonals 96, 97 to a measuring depth of 150 ⁇ m are measured by determining an equivalent diameter 99 (by means of circular equivalence). The top of the pressed fleece is defined as the zero point. Nonwovens that are thinner than 150 ⁇ m can be detected with their entire thickness using this method. If individual filament sections are cut at the corner points of the square, their equivalent diameter 99 can still be completely determined by means of circular equivalence.
  • the measurement method described can be repeated at two further fleece locations and the mean value over all equivalent diameters 99 of the individual filament sections 98 of those fleece locations can be formed. Multifilament sections and nodes are disregarded during the measurement.
  • Examples B1 to B7 obtained in this way consist 100% of cellulose, namely of regenerated Lyocell moldings, and all have a specific opacity of greater than 1% .m 2 / g and a weight per unit area of less than 70 g / m 2 .
  • the parameters (air pressure and amount of coagulation liquid) in Table 2 were given as factors based on Reference Example B4.
  • the reference parameters for reference example B4 were determined by adjusting the production system, so that a nonwoven fabric with an average basis weight of 25 g / m 2 ⁇ 10% and an average specific opacity of 1.6% ⁇ m 2 / g ⁇ 10% was obtained ,
  • the specific opacity of the nonwovens B1 to B7 was determined in accordance with the measurement method set out above. The measured values determined are shown in Table 3.
  • Table 3 Measured values for nonwovens according to the invention example Reflection black Reflection white Opacity [%] Mass [g] Basis weight [g / m 2 ] Specific opacity [% ⁇ m 2 / g] B1 29.36 83.09 35.33 0,330 33.0 1.07 B2 57,80 84.45 68.44 0.612 61.2 1.12 B3 20.35 82.82 24.57 0.158 15.8 1.56 B4 32.46 83.06 39.08 0.236 23.6 1.66 B5 24.23 82,88 29.23 0,152 15.2 1.92 B6 29.19 83.22 35.08 0.182 18.2 1.93 B7 28.34 82.98 34.16 0.156 15.6 2.19
  • Comparative Examples V1 to V4 are shown in Table 3.
  • the weight per unit area and the specific opacity of the comparative examples were determined in accordance with the measurement method described above.
  • Table 3 Properties of the comparative examples example material production method Basis weight [g / m 2 ] Specific opacity [% ⁇ m 2 / g] V1 100% polypropylene Carded, thermobond 32.0 0.74 V2 100% lyocell Carded, water jet vf. 79.7 0.88 V3 100% cupro spunbond 40.5 0.98 V4 100% polyester spunbond 19.0 1.51
  • Comparative Example V1 is a carded, thermally bonded (thermobond) fleece made of 100% polypropylene fibers of the Sawabond 4138 type, Sandler AG.
  • the fleece has a low basis weight of 32 g / m 2 , but showed a low specific opacity of only 0.74% ⁇ m 2 / g in the measurement.
  • Comparative example V2 is a carded, water-jet bonded fleece made of 100% Lyocell staple fibers from Lenzing AG.
  • the fleece has a comparatively high basis weight of 79.7 g / m 2 , but nevertheless only achieves a specific opacity of 0.88% ⁇ m 2 / g.
  • a 100% cupro spunbonded fabric from Asahi Kasei Corp. is used as comparative example V3.
  • type Bemliese SE384G. With a basis weight of 40.5 g / m 2 , the spunbonded fabric can only achieve a specific opacity of 0.98% ⁇ m 2 / g.
  • Comparative Example V4 shows a 100% polyester nonwoven spunbond type Reemay 2250 of Berry Global Inc.
  • the polyester spunbond nonwoven is at a low basis weight of 19.0 g / m 2 an excellent specific opacity of 1.51% ⁇ m 2 / G.
  • the comparative examples V1 to V4 are each represented as measured values 61, 62, 63 and 64 and placed in relation to the measured values 60 of the examples B1 to B7 according to the invention.

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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)
  • Artificial Filaments (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
EP18186541.1A 2018-07-31 2018-07-31 Non-tissé, utilisation du non-tissé et chiffon, toile de séchage ainsi que masque pour le visage comportant du non-tissé Active EP3604652B1 (fr)

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ES18186541T ES2964861T3 (es) 2018-07-31 2018-07-31 Tela no tejida, uso de la tela no tejida y toallita de limpieza, toallita para secar y mascarilla que contiene la tela no tejida
EP18186541.1A EP3604652B1 (fr) 2018-07-31 2018-07-31 Non-tissé, utilisation du non-tissé et chiffon, toile de séchage ainsi que masque pour le visage comportant du non-tissé
TW108124862A TW202024420A (zh) 2018-07-31 2019-07-15 非織物、該非織物之用途、以及含有該非織物之拭巾、乾燥機用調理巾和面膜
US17/263,314 US20210164138A1 (en) 2018-07-31 2019-07-25 Nonwoven material, use of the nonwoven material, and wiping cloth, drying cloth and face mask containing the nonwoven material
KR1020217005698A KR20210035876A (ko) 2018-07-31 2019-07-25 부직포, 부직포의 용도, 및 부직포를 포함한 와이프, 드라이어 시트 및 안면 마스크
BR112020026898-4A BR112020026898A2 (pt) 2018-07-31 2019-07-25 Material tnt, uso do material tnt, bem como pano de limpeza, pano de secagem e máscara de face contendo o material tnt
CN201980051134.7A CN112513357B (zh) 2018-07-31 2019-07-25 无纺织物、无纺织物的用途和包含所述无纺织物的擦拭巾、干衣纸以及面膜
JP2021505742A JP7477241B2 (ja) 2018-07-31 2019-07-25 不織布、不織布の使用、及び不織布を含むワイプ、ドライヤーシート、及びフェイスマスク
PCT/EP2019/070035 WO2020025440A1 (fr) 2018-07-31 2019-07-25 Non-tissé, utilisation du non-tissé et lingette, torchon ou masque facial contenant le non-tissé
US18/387,303 US20240068140A1 (en) 2018-07-31 2023-11-06 Nonwoven material, use of the nonwoven material, and wiping cloth, dryer sheet and face mask containing the nonwoven material

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EP4163430A1 (fr) 2021-10-08 2023-04-12 Lenzing Aktiengesellschaft Couche non-tissée comprenant un réseau de fibres cellulosiques régénérées sensiblement continues

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DE102021104011B4 (de) 2021-02-19 2022-11-03 Delfortgroup Ag Strukturiertes filtermaterial für nikotinabgabeprodukte

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EP3604652B1 (fr) 2023-09-06
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CN112513357A (zh) 2021-03-16
BR112020026898A2 (pt) 2021-03-30
WO2020025440A1 (fr) 2020-02-06
TW202024420A (zh) 2020-07-01
CN112513357B (zh) 2023-07-11
US20210164138A1 (en) 2021-06-03
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KR20210035876A (ko) 2021-04-01

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