EP3406780B1 - Getemperter meltblown-vliesstoff mit hoher stauchhärte - Google Patents

Getemperter meltblown-vliesstoff mit hoher stauchhärte Download PDF

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Publication number
EP3406780B1
EP3406780B1 EP17172180.6A EP17172180A EP3406780B1 EP 3406780 B1 EP3406780 B1 EP 3406780B1 EP 17172180 A EP17172180 A EP 17172180A EP 3406780 B1 EP3406780 B1 EP 3406780B1
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Prior art keywords
meltblown nonwoven
nonwoven fabric
filaments
meltblown
annealed
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EP17172180.6A
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German (de)
English (en)
French (fr)
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EP3406780A1 (de
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Axel Nickel
Norbert Jording
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Individual
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Priority to EP17172180.6A priority Critical patent/EP3406780B1/de
Priority to CN201880049523.1A priority patent/CN111226001B/zh
Priority to US16/633,065 priority patent/US20200165759A1/en
Priority to PCT/EP2018/063287 priority patent/WO2018215402A1/de
Publication of EP3406780A1 publication Critical patent/EP3406780A1/de
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    • 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
    • D04H1/56—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 in association with fibre formation, e.g. immediately following extrusion of staple fibres
    • 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
    • D04H1/4282—Addition polymers
    • D04H1/4291—Olefin 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
    • D04H3/005—Synthetic yarns or filaments
    • D04H3/007—Addition polymers
    • 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
    • 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
    • D10B2321/00—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D10B2321/02—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polyolefins
    • D10B2321/022—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polyolefins polypropylene

Definitions

  • the present invention relates to a tempered meltblown nonwoven with a high compression hardness and in particular to a tempered voluminous meltblown nonwoven with a high compression hardness. Furthermore, the present invention relates to a method for producing such a tempered meltblown nonwoven.
  • Felts and nonwovens are usually produced from staple fibers and / or continuous filaments by means of known mechanical or aerodynamic processes.
  • a well-known aerodynamic process is the meltblown process based on the Exxon principle, such as that in the US 3,755,527 is described.
  • a low-viscosity polymer is extruded through capillaries located at the tip of a nozzle.
  • the polymer droplets that form are then subjected to an air flow, which is referred to as blown air and has a high temperature and speed, from two sides, as a result of which the polymer droplets are drawn out into a polymer free jet in the form of fine filaments.
  • the polymer strands are additionally stretched, so that the filaments obtained after the filaments have been deposited on a support and after cooling can have a diameter and fineness in the single-digit micrometer range or even less.
  • the meltblown nonwovens or meltblown nonwovens produced in this way are used for various applications, for example for barrier functions in the hygiene area. For these applications, the filaments are placed on the carrier as a flat, two-dimensional nonwoven.
  • Voluminous, three-dimensional meltblown nonwovens can also be produced by depositing the filaments formed between two suction drums or double drums, as is the case, for example, in DE 17 85 712 C3 and in the US 4,375,446 is described.
  • These voluminous meltblown nonwovens can be used, for example, as oil absorbers or as acoustic damping materials.
  • these voluminous meltblown nonwovens have the disadvantage that they are very ductile and are characterized by poor relaxation, which leads to a loss of volume after pressure load.
  • meltblown nonwovens which contain, in addition to the meltblown filaments, staple fibers of polyethylene terephthalate incorporated therein. These nonwovens are characterized by increased resilience, which is why the nonwoven has better relaxation. However, these nonwovens are constructed from two incompatible polymers, which precludes recycling, which in turn leads to a major cost disadvantage.
  • a major disadvantage of the known meltblown nonwovens and in particular of the known voluminous meltblown nonwovens is their comparatively low rigidity and the resulting low compression hardness, in particular under higher loads. Furthermore, these materials are usually limp, which means that they deform under their own weight, but not a specific one Keep in shape. For these reasons, these known meltblown nonwovens and in particular known voluminous meltblown nonwovens are difficult to convert permanently into a predetermined shape. Deformation generally leads to compression of these nonwovens.
  • meltblown nonwoven and in particular a voluminous meltblown nonwoven, which has increased rigidity and, in particular, an increased compression hardness, especially under greater loads, and which is also easy to convert into a predetermined, permanent shape.
  • this object is achieved by a tempered meltblown nonwoven fabric which can be obtained by a process in which at least some of the meltblown nonwoven fabric is subsequently tempered at a temperature which is between the glass transition temperature and 0.1 ° C. below the melting temperature of the filaments of the meltblown nonwoven, the meltblown nonwoven being composed of filaments from a polyolefin, and the meltblown nonwoven having a basis weight of 100 to 600 g / m 2 , a density of 5 to 50 kg / m 3 and one in accordance with DIN EN Compression hardness measured according to ISO 3386 at 60% compression of at least 2 kPa.
  • meltblown nonwoven fabric according to the invention is also characterized by a significantly increased compression hardness, especially under greater loads, such as, for example, at 40% or 60% compression , namely by a compression hardness measured according to DIN EN ISO 3386 at 60% compression of at least 2 kPa.
  • meltblown nonwoven according to the invention can easily be shaped into a desired shape during the tempering.
  • these advantages are at least partly due to the fact that the degree of crystallization of the nonwoven filaments, which were previously predominantly amorphous, is significantly increased during the subsequent annealing carried out according to the invention. This is suspected because the inventors found that the melting temperature of the filaments of the meltblown nonwoven fabric can increase by about 10 to 20 ° C depending on the conditions during the annealing.
  • the filament fineness and the nonwoven structure are not changed, or at most only insignificantly, by the tempering, so that after the tempering the nonwoven maintains its other properties, such as, for example, in the case of a voluminous nonwoven, its thickness-specific acoustic properties, such as the degree of acoustic absorption.
  • meltblown nonwoven is understood to mean a nonwoven fabric produced using one of the known meltblown processes, regardless of whether it is a two-dimensional nonwoven or a voluminous nonwoven.
  • Processes for producing such meltblown nonwovens are, for example, in US Pat US 4,118,531 , in the US 4,375,446 , in the US 4,380,570 and in the DE 17 85 712 C3 described.
  • annealing is generally understood to mean a heat treatment, that is to say the heating of the meltblown nonwoven at the aforementioned temperature for a certain period of time.
  • the meltblown nonwoven is subsequently annealed, specifically at a temperature which is between the glass transition temperature and 0.1 ° C. below the melting temperature of the filaments of the meltblown nonwoven.
  • Both the glass transition temperature and the melting temperature of the filaments of the meltblown nonwoven refer to the corresponding temperatures of the meltblown nonwoven present at the time.
  • the inventors have found that the melting temperature of the filaments of the meltblown nonwoven fabric can increase by about 10 to 20 ° C depending on the conditions during the annealing. Therefore, the temperature can be raised during annealing. For example, if the melting temperature of the filaments of the meltblown nonwoven is 152 ° C.
  • the tempering can be carried out, for example, in such a way that the meltblown nonwoven is first annealed at a temperature of 150 ° C, after a certain period of time, for example 10 minutes, the temperature is increased to 155 ° C (which is 2 ° C below the melting temperature which the filaments of the meltblown nonwoven have at this time), before after a further period of 10 minutes, for example, the temperature is raised again to 165 ° C. (which is 2 ° C. below the melting temperature which the filaments of the meltblown nonwoven have at this point in time).
  • the meltblown nonwoven is partially or fully annealed.
  • a specific partial area of the meltblown nonwoven or several partial areas of the meltblown nonwoven can be annealed, whereas the rest of the meltblown nonwoven remains untempered. It is also possible and, according to the present invention, particularly preferred to heat the entire meltblown nonwoven.
  • the meltblown nonwoven or the subarea (s) to be tempered at one temperature are annealed, which is between 20 ° C below the melting temperature and 1 ° C below the melting temperature of the filaments of the meltblown nonwoven.
  • the tempering is particularly preferably carried out at a temperature which is between 15 ° C. below the melting temperature and 1 ° C. below the melting temperature and very particularly preferably between 10 ° C. below the melting temperature and 2 ° C. below the melting temperature, for example at about 5 ° C below the melting temperature (for example between 8 ° C below the melting temperature and 2 ° C below the melting temperature) of the filaments of the meltblown nonwoven.
  • the duration of the annealing depends on the temperature to which the meltblown nonwoven is heated during the annealing, with a lower annealing temperature tending to require a longer annealing period. Basically, an annealing period of 1 minute to 10 days and in particular 2 minutes to 24 hours has proven to be suitable.
  • the period of annealing is preferably 2 minutes to 2 hours, particularly preferably 2 to 60 minutes and most preferably 2 to 10 minutes.
  • meltblown nonwoven is annealed for 2 minutes to 2 hours at a temperature which is between 20 ° C. below the melting temperature and 1 ° C. below the melting temperature of the filaments of the meltblown nonwoven.
  • Annealing is particularly preferred of the meltblown nonwoven is carried out for 2 to 60 minutes at a temperature which is between 15 ° C. below the melting temperature and 2 ° C. below the melting temperature of the filaments of the meltblown nonwoven, and the tempering of the meltblown nonwoven is very particularly preferred for 2 to 10 minutes at a temperature which is about 5 ° C below the melting temperature, that is between 8 ° C below the melting temperature and 2 ° C below the melting temperature of the filaments of the meltblown nonwoven.
  • the melting point of the meltblown nonwoven may increase during annealing due to the increase in the degree of crystallization.
  • the distance between the tempering temperature and the melting point of the meltblown nonwoven would increase more and more during the tempering, and the required tempering time would be comparatively long. Therefore, in accordance with an alternative embodiment of the present invention, it is proposed to increase the temperature during the annealing in order to keep the annealing temperature always just below (for example about 2 ° C. or 5 ° C.) below the melting point of the meltblown nonwoven which increases during the annealing , For example, if the melting temperature of the filaments of the meltblown nonwoven is 152 ° C.
  • the tempering can be carried out as described above, for example that the meltblown nonwoven is first tempered at a temperature of 150 ° C, after a certain period of time, for example 10 minutes, the temperature is 155 ° C (which is 2 ° C below the melting temperature that the filaments of the meltblown nonwoven at this time ) is increased before, after a further period of 10 minutes, for example, the temperature is again increased to 165 ° C. (which is 2 ° C. below the melting temperature that the filaments of the meltblown nonwoven have at this point in time).
  • the present invention is not restricted with regard to the way in which the meltblown nonwoven is annealed.
  • Annealing in which hot melt and / or superheated steam is applied to the meltblown nonwoven fabric, has proven to be not only simple, but particularly effective.
  • the hot air or the superheated water vapor has a temperature which corresponds to that to which the meltblown nonwoven is to be heated during the annealing.
  • hot air or superheated steam is preferably applied to the meltblown nonwoven by flowing hot air or superheated steam around the meltblown nonwoven or, more preferably, flowing through it.
  • the meltblown nonwoven is preferably annealed in an oven which has at least one blow box which is arranged such that the hot air or the superheated steam can be blown into the meltblown nonwoven. If only one or more areas of the meltblown nonwoven are to be tempered, the blow box should be designed so that the hot air or the superheated steam is only blown into the area (s) of the meltblown nonwoven to be tempered.
  • the meltblown nonwoven be annealed in an oven which has at least one suction box, which is arranged such that air flowing through the meltblown nonwoven or superheated water vapor can be sucked off in order to ensure a safe flow guarantee. Vacuuming on both sides ensures that hot air or superheated water vapor flows safely through the nonwoven fabric and that the nonwoven fabric does not collapse but maintains its volume.
  • the meltblown nonwoven is annealed in an oven which has at least one blow box and at least one suction box, the at least one blow box being arranged such that the hot air or the superheated water vapor in the meltblown Nonwoven can be blown in, and, wherein the at least one suction box is arranged so that the air flowing through the meltblown nonwoven or superheated water vapor can be sucked off.
  • the furnace particularly preferably has two blow boxes and one or two suction boxes, the suction box being arranged downstream of the first or second blowing box in the case of a suction box, and, the two suction boxes being downstream of the first and the second in the case of two suction boxes Blow box are arranged.
  • the meltblown nonwoven has a weight per unit area of 100 to 600 g / m 2 , preferably 100 to 400 g / m 2 and particularly preferably 250 to 350 g / m 2 , such as 350 g / m 2 .
  • the meltblown nonwoven is preferably a voluminous meltblown nonwoven with a density of 8 to 25 kg / m 3 and particularly preferably of 10 to 20 kg / m 3 .
  • the filaments of the meltblown nonwoven according to the present invention are composed of a polymer selected from the group consisting of polypropylene and polyethylene.
  • the filaments of the meltblown nonwoven according to the present invention are very particularly preferably composed of isotactic polypropylene, since it has been found that the degree of crystallization is particularly well increased during the tempering in filaments made of isotactic polypropylene.
  • the meltblown nonwoven in a shaped body in order to also convert the meltblown nonwoven into a predetermined shape during the annealing.
  • This can be achieved, for example, in that the molded body in which the meltblown nonwoven is tempered is at least partially designed as a sieve, so that the meltblown nonwoven is flowed through and / or flowed around with hot air or with superheated steam during the tempering can.
  • meltblown nonwoven after heating, but before cooling, in a shaped body and thus to convert it into a predetermined shape in order to shape it, the meltblown nonwoven being cooled in the mold in order to complete the tempering process ,
  • the meltblown nonwoven can be shaped into a specific shape, such as a hemisphere, by tempering as a stamped part.
  • the meltblown nonwoven fabric, tempered and shaped in this way is significantly more dimensionally stable than the starting material and largely retains its shape.
  • the meltblown nonwoven can therefore take on forces after tempering, so that additional stiffening structural elements in the meltblown nonwoven can be dispensed with after molding.
  • At least one spacer which has a length that is greater than the thickness of the meltblown nonwoven, is provided in the meltblown nonwoven and is arranged in the thickness direction of the meltblown nonwoven. This is advantageous, for example, if the meltblown nonwoven is to be used as an acoustic absorber.
  • an inherently rigid molded part is obtained, in which, due to the spacer (s) - if it acts as an acoustic absorber in front of a reflective plane, such as the sheet metal wall of an automobile, is mounted - a not insignificant air gap is formed between the absorber and the reflecting plane, the additional air volume thus created acting as an integral part of the absorber structure.
  • a molded part made of meltblown nonwoven fabric with an excellent absorber effect can be achieved with a significantly reduced material expenditure.
  • the air volume enclosed between the absorber and the wall results in a significant improvement in the low-frequency behavior of the structure, which can otherwise only be achieved by means of correspondingly thick and thus also heavy and expensive materials.
  • the air volume between the absorber and the wall described above can also be created by a structure of the wall with a flat absorber or a structure of the wall and the absorber, the inherent rigidity of the absorber being necessary for the permanent formation of the air volume.
  • the meltblown nonwoven to be tempered can be made by any of the known meltblown processes, such as one in the art US 4,118,531 , in the US 4,375,446 , in the US 4,380,570 or in the DE 17 85 712 C3 described method.
  • a meltblown process is used to produce nonwoven by extruding polymer melt extruded through a nozzle on the outside with flowing air and stretching it before the filaments thus formed are placed on a carrier and cooled.
  • the carrier is preferably a double suction drum.
  • the degree of crystallization of the meltblown nonwoven is increased by the annealing.
  • the filaments of the annealed meltblown nonwoven preferably have at least in sections and preferably over the entire surface, a degree of crystallization of 20 to 80%, more preferably 30 to 75%, particularly preferably 40 to 75% and most preferably 50 to 70%. If the meltblown nonwoven is annealed only in sections, the tempered areas of the annealed meltblown nonwoven preferably have a degree of crystallization of 20 to 80%, more preferably 30 to 75%, particularly preferably 40 to 75% and most preferably 50 to 70 % on.
  • the meltblown nonwoven has, at least in sections and preferably over the entire surface, a compression hardness (compressive stress) measured at 60% compression of at least 2 kPa based on DIN EN ISO 3386.
  • the meltblown nonwoven preferably has, at least in sections and preferably over the entire area, a compression hardness (compressive stress) measured in accordance with DIN EN ISO 3386 at 60% compression of at least 8 kPa, particularly preferably of at least 12 kPa, very particularly preferably of at least 20 kPa and maximum preferably has at least 30 kPa.
  • the compression hardness at 60% compression is to be understood as the compressive stress under which a material sample is reduced by 60% of the original thickness.
  • the preload for determining the initial thickness of the material is reduced to 0.014 kPa in order to take into account the very low compression hardness of the untempered material. In the case of deviating degrees of compression or other test conditions, deviating compressive stresses with non-linear relationships to the stated values can result.
  • the annealing temperature In order to shorten the annealing time, it is proposed in a further development of the inventive concept to raise the annealing temperature continuously or in stages during the annealing, and preferably also above the melting temperature of the non-annealed filaments of the meltblown nonwoven, the annealing temperature, however, always being at least 0.1 ° C below the current (ie the melting temperature of the filaments of the meltblown nonwoven at this time.
  • the present invention makes it possible to increase the degree of crystallization of the filaments of meltblown nonwovens in sections or over the entire area, and thus to increase the rigidity of meltblown nonwovens in sections or over the entire area.
  • the present invention can be used to anneal the entire surface of the meltblown nonwoven and thus to increase the degree of crystallization in the entire area of the meltblown nonwoven. This enables the production of rigid, pressure-stable two-dimensional components.
  • the shaped meltblown nonwoven can also only be partially annealed and the degree of crystallization in the meltblown nonwoven can only be raised over part of the surface, for example to increase the rigidity only in component-specific areas or in the continuous grid of the component.
  • edge areas of the component made of the meltblown nonwoven can be annealed in order to make the edge areas of the component more rigid, for example to increase the stackability of the component made of the meltblown nonwoven.
  • tempering can be used to form a component from the meltblown nonwoven and to increase the degree of crystallization over the entire surface in order to produce inherently rigid three-dimensional components.
  • locally condensed or consolidated areas can expand the functionality, for example for the formation of contact surfaces at fastening points.
  • Another object of the present invention is a tempered meltblown nonwoven whose filaments are at least in sections and preferably over the entire surface have a degree of crystallization of 20 to 80%, preferably 30 to 75%, particularly preferably 40 to 75% and most preferably 50 to 70%.
  • the present invention relates to a meltblown nonwoven with a compression hardness measured at least in sections and preferably over the entire surface in accordance with DIN EN ISO 3386 at 60% compression of at least 2 kPa.
  • the meltblown nonwoven according to the invention preferably has a compression hardness at 60% compression of at least 8 kPa, particularly preferably of at least 12 kPa, very particularly preferably of at least 20 kPa and most preferably of at least 30 kPa.
  • the meltblown nonwoven in step b) is annealed for 2 minutes to 2 hours at a temperature which is between 20 ° C. below the melting temperature and 1 ° C. below the melting temperature of the filaments of the meltblown nonwoven ,
  • the Fig. 1 schematically shows a belt furnace 10 for producing a tempered meltblown nonwoven according to an embodiment of the present invention.
  • the open 10 comprises air-permeable belts 14, 14 'which are guided and driven on rollers 12 and via which the meltblown nonwoven fabric 15 is guided into and through the oven 10.
  • the meltblown nonwoven 15 is passed through the furnace 10 from right to left on the lower belt 14.
  • meltblown nonwoven fabric 15 When passing through the blow boxes 16, 16 ', hot air is flowed into and through the meltblown nonwoven fabric 15 in order to raise the filaments of the meltblown nonwoven fabric 15 to the desired tempering temperature. In the area of the suction box 18, air flowing through the meltblown nonwoven 15 is sucked off to ensure that the meltblown nonwoven 15 is safely flowed through by the hot air and the meltblown nonwoven 15 does not collapse but maintains its volume.
  • FIG. 2 schematically shows a mold 20 for the simultaneous molding and tempering of a meltblown nonwoven fabric 15 according to another exemplary embodiment of the present invention.
  • the meltblown nonwoven fabric 15 is held in the desired shape from both sides by appropriately shaped sieves 22, 22 ', from which the mold 20 is composed, and heated to the desired temperature by tempering or flowing hot air around it.
  • the nonwoven mat produced in this way retains the embossed shape and is dimensionally stable.
  • a meltblown nonwoven fabric with a basis weight of 300 g / m 2 and a density of 15 kg / m 3 was produced from filaments made of isotactic polypropylene with a filament fineness of 5 ⁇ m on average by using the US 4,375,446 described meltblown process was carried out.
  • This meltblown nonwoven was then heat-treated in a forced air oven at 158 ° C. for 10 minutes. By inserting the cold nonwoven and opening the oven door, the initial temperature was below the melting point of the filaments of the unheated nonwoven. Due to the immediate onset of crystallization with an accompanying increase in the melting point of the filaments, the rest of the 10 minutes could be further tempered at 158 ° C, i.e. above the melting temperature of the unheated filaments, but below the melting temperature of the filaments present at the time, and so on Tempering time can be shortened compared to tempering at a lower temperature.
  • the degree of sound absorption of the tempered meltblown nonwoven was measured as a function of the thickness-standardized frequency in accordance with DIN EN ISO 10534.
  • the results are in the Fig. 3 in curve A in comparison to the values which have been achieved with the unannealed meltblown nonwoven fabric produced in the comparative example (curve B).
  • the unit of the abscissa is the measurement frequency x absorber thickness / 15 mm. The comparison of the results shows that the heat treatment according to the invention has no negative effects on the sound absorption properties of the nonwoven.
  • An annealed meltblown nonwoven fabric was made according to the procedure described in Example 1, except that the annealing was carried out at 155 ° C for 10 minutes.
  • An annealed meltblown nonwoven fabric was made according to the procedure described in Example 1, except that the annealing was carried out at 155 ° C for 25 minutes.
  • Example 1 An untempered meltblown nonwoven fabric was produced in accordance with the first process step described in Example 1, which, unlike the one described in Example 1, was not annealed.
  • Table 1 example Annealing temperature (° C) Annealing time (min.) Compression hardness factor at 60% compression Compression hardness factor at 60% compression 1 158 10 18.5 14 2 155 10 9.5 7 3 155 25 12 9 Comparative Example 1 - - 1 1 Compression hardness factor: Ratio of the compression hardness of the annealed nonwoven fabric of the example divided by the compression hardness of the non-annealed nonwoven fabric of the comparative example

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Nonwoven Fabrics (AREA)
EP17172180.6A 2017-05-22 2017-05-22 Getemperter meltblown-vliesstoff mit hoher stauchhärte Active EP3406780B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP17172180.6A EP3406780B1 (de) 2017-05-22 2017-05-22 Getemperter meltblown-vliesstoff mit hoher stauchhärte
CN201880049523.1A CN111226001B (zh) 2017-05-22 2018-05-22 具有高压缩硬度的经回火的熔喷非纺织物
US16/633,065 US20200165759A1 (en) 2017-05-22 2018-05-22 Tempered Melt-Blown Nonwoven Having a High Compression Hardness
PCT/EP2018/063287 WO2018215402A1 (de) 2017-05-22 2018-05-22 Getemperter meltblown-vliesstoff mit hoher stauchhärte

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EP17172180.6A EP3406780B1 (de) 2017-05-22 2017-05-22 Getemperter meltblown-vliesstoff mit hoher stauchhärte

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EP3406780A1 EP3406780A1 (de) 2018-11-28
EP3406780B1 true EP3406780B1 (de) 2020-01-08

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EP3425099A1 (de) * 2017-07-03 2019-01-09 Axel Nickel Meltblown-vliesstoff mit verbesserter stapelbarkeit und lagerbarkeit

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CN111226001A (zh) 2020-06-02
EP3406780A1 (de) 2018-11-28
US20200165759A1 (en) 2020-05-28
WO2018215402A1 (de) 2018-11-29

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