EP2855753A1 - Procédé de fabrication d'un non-tissé - Google Patents

Procédé de fabrication d'un non-tissé

Info

Publication number
EP2855753A1
EP2855753A1 EP13727050.0A EP13727050A EP2855753A1 EP 2855753 A1 EP2855753 A1 EP 2855753A1 EP 13727050 A EP13727050 A EP 13727050A EP 2855753 A1 EP2855753 A1 EP 2855753A1
Authority
EP
European Patent Office
Prior art keywords
nonwoven fabric
spacers
carrier layer
base material
structures
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.)
Withdrawn
Application number
EP13727050.0A
Other languages
German (de)
English (en)
Inventor
Andreas Seeberger
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.)
Irema-Filter GmbH
Original Assignee
Irema-Filter GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Irema-Filter GmbH filed Critical Irema-Filter GmbH
Publication of EP2855753A1 publication Critical patent/EP2855753A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
    • B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/52—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
    • B01D46/521—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/52—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
    • B01D46/521—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material
    • B01D46/523—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material with means for maintaining spacing between the pleats or folds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
    • B01D67/0002—Organic membrane manufacture
    • 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
    • D04H3/03—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 at random
    • D04H3/033—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 at random reorientation immediately after yarn or filament formation
    • 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
    • B01D2239/0622—Melt-blown
    • 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
    • B01D2239/10—Filtering material manufacturing

Definitions

  • the invention relates to a process for the production of a nonwoven fabric, in particular a nonwoven filter medium or air filter medium, in a melt-spinning process comprising the steps of: melting a polymer, spraying the polymer from at least one spinning beam and collecting the polymer on a carrier layer, such that a nonwoven fabric is formed.
  • Nonwovens produced by this process are used as filter media in filters, e.g. used in indoor air filters and air conditioning systems, but in particular in air filters for the motor vehicle interior or for engines.
  • the nonwoven webs are usually formed in a masterbatch process by a melt-spinning process, such as by spunbonding. a spun-bond process or a melt-blown process, as e.g. is described in DE 41 23 122 A1.
  • the intake air of internal combustion engines e.g. in motor vehicles or in the off-highway area is usually filtered to protect the engine combustion chamber from mechanical damage by sucked particles from the ambient air.
  • An important criterion in the design of the filter elements is to ensure a long service life of the filter with simultaneously high separation efficiency of the sucked particles.
  • pollen filters that only filter pollen from the incoming air in the vehicle are not sufficient for the vehicle interior.
  • the allergens to which the immune system of allergic persons react are proteins whose diameter is only a fraction of the pollen diameter. They are in the size range around 0, 1 ⁇ , i. the area that has the biggest problems for particle filters, the so-called MPPS (Most Penetrating Particle Size). Accordingly, the separation efficiency in this size range should be at least 50%, measured by means of an aerosol whose particles have somewhat the same density, e.g. NaCl. At the same time with such filters when installed in motor vehicles life of at least 30 000 kilometers can be achieved.
  • the filter material is zigzag folded, ie pleated.
  • spacers are usually achieved by embossing the filter material. Embossing is only possible in paper filters in a satisfactory manner.
  • filters made of PP, PET or polyester can be embossed very poorly or not at all.
  • nonwoven fabric filters of these materials which consist of nonwoven fibers
  • the surface of the filter which has been flown over and which is defined by the filter material surface accessible for the air flow to be filtered is reduced. This increases the differential pressure.
  • the fusion or the embossing a further step is necessary. In the case of the carrier material even material costs are incurred for this, which makes the filter more expensive.
  • EP 1 970 111 A1 discloses a composite filter media structure comprising a corrugated base substrate comprising nonwoven synthetic fibers which are made by a dry-laid process and which corrugate the base substrate during the molding process. To corrugate the nonwoven synthetic fibers, the fibers are heated and passed through oppositely profiled calender rolls. In a finished filter element, contiguous folds of the corrugation form oval tubes which allow filtered air to flow through the filter element.
  • the object of the present invention is to provide a process for producing a nonwoven fabric which overcomes the above drawbacks and which produces a nonwoven fabric which does not require additional operations than the primary forming process of the nonwoven fabric to introduce spacers. Furthermore, it is the object to provide a corresponding device for the production and the nonwoven fabric.
  • a base material which forms the later nonwoven fabric is collected on a carrier layer which has structures, so that spacers are formed in the nonwoven fabric during the formation of the nonwoven fabric.
  • the process according to the invention for producing a nonwoven fabric has the advantage that spacers are already introduced into the nonwoven fabric in the primary molding process, ie in the melt-spinning process used. This eliminates a step, since the filter material must be neither coined nor corrugated or fused to ensure compliance with the distance of adjacent layers of the nonwoven fabric, for example, in a plissage.
  • bumps and / or depressions which serve as spacers need not be introduced over the entire area of the nonwoven fabric, as is necessary, for example, in corrugating. Only thereby is it possible to provide a filter with substantially planar adjacent layers, which are held at a defined distance from each other.
  • the spacers can be varied as desired by the formation of the carrier layer used in the primary molding process. Therefore, the size and / or the density of the spacers for each application can be kept low. This ensures that as small a portion of the surface of the nonwoven fabric as possible is covered with spacers, which in turn improves the filtering properties of such a nonwoven fabric as a filter material.
  • a nonwoven fabric according to the present invention is a fabric of individual fibers and consists essentially of loosely connected fibers which are not bonded together.
  • Base materials for the nonwoven fabrics are preferably mineral fibers, e.g. Glass, asbestos, mineral wool, basalt, chemical fibers, e.g. from natural polymers such as cellulose, or from synthetic polymers such as polyamide, polyester, polyvinyl chloride, polypropylene, polyethylene, polyphylene sulfite, polyacrylonitrile, polyimide, polytetrafluoroethylene, aramides, polyamide or even fiber blends of at least two of these raw materials.
  • mineral fibers e.g. Glass, asbestos, mineral wool, basalt
  • chemical fibers e.g. from natural polymers such as cellulose, or from synthetic polymers such as polyamide, polyester, polyvinyl chloride, polypropylene, polyethylene, polyphylene sulfite, polyacrylonitrile, polyimide, polytetrafluoroethylene, aramide
  • a melt-spinning process according to the present invention is any type of melt-blown process which can be used to make a nonwoven fabric.
  • a spinning beam according to the present invention is any type of device that can be used to spray a polymer.
  • the spinning beam is one or more spray nozzles, which are arranged predominantly next to one another, in particular in a beam.
  • a carrier layer in the sense of the invention is a surface which is suitable for collecting a sprayed raw material.
  • the carrier layer thereby performs a relative movement with respect to a spinning beam.
  • a structure in the sense of the invention is any type of three-dimensional structure which is formed on the two-dimensional support layer, or else a hole.
  • a spacer according to the invention is any type of shaping and / or material change in a nonwoven fabric, which serves to keep two layers of at least one nonwoven fabric spaced from each other when they are laid flat on each other.
  • the structures are arranged defined in the manner that substantially planar layers of the nonwoven fabric in a distance defined by the shaped spacers from each other are preserved, in particular by meeting during pleating spacers adjacent pleats of the plissage depending on the definition and / or do not clash.
  • a level position within the meaning of the invention is a continuous surface.
  • the nonwoven fabric is particularly well suited as an air filter medium for producing an air filter.
  • the spacers allow this an unhindered throughflow along the layers of a filter medium through the medium to be filtered.
  • the spacers also prevent individual layers of a filter from collapsing.
  • the spacers are formed on the flat layers of the nonwoven fabric.
  • the base material is guided between the spinning beam and the carrier layer by an air flow and / or the air is sucked under the carrier layer.
  • Both measures serve to control the collection or removal of the base material on the carrier layer and the turbulence of the base material before impinging on the carrier layer.
  • the base material is deep-drawn by the air flow and / or gravity in the structures of the carrier layer.
  • the deep drawing of the base material has the advantage that spacers can not be arranged only on one side of the filter medium.
  • the material properties of the nonwoven fabric can be changed.
  • the flow and / or the pressure of the base material are pulsed in time by the at least one spray bar.
  • the pulsing and the concomitant change in the spraying of the base material from the spinning beam (s) causes a change in the structure of the nonwoven fabric.
  • the carrier layer is coated, in particular Teflon-coated.
  • Teflon-coated By the coating can be achieved that the nonwoven fabric can be removed from the support layer despite the structures on the support layer without problems.
  • the structures are each arranged in such a way that, when pleating the nonwoven fabric, spacers of adjacent pleats of the plissage meet or do not meet one another.
  • the spacers are each staggered or arranged so as to meet each other when folding.
  • the distance of individual layers and the stability derselbigen can be adjusted.
  • the nonwoven fabric according to the invention has the further advantage that, despite the presence of the spacers, it has substantially the same material structure over the entire surface of the nonwoven fabric.
  • spacers may be applied even though the remainder of the nonwoven remains substantially planar. Furthermore, the spacers may also be arranged in non-symmetrical or irregularly recurring sequences.
  • the nonwoven fabric is a single layer.
  • Single-layer in the sense of the invention means that in the nonwoven fabric, no two different layers are recognizable, but the material is constructed continuously, with respective transitions in the material structure, for example in the density of certain fibers, run continuously.
  • the filtering effect of the nonwoven fabric over its entire surface is substantially constant.
  • the nonwoven fabric preferably forms a closed surface in which a certain pore size is preferably not exceeded and is preferably not fallen below.
  • the nonwoven fabric is self-supporting plissiergraphy.
  • the nonwoven fabric is stiffened so that it can be self-supporting pleated without a further substrate layer or additional reinforcements, without substantially producing distortions.
  • the height of the spacers depends on the position of the respective spacer in a substantially planar position of the pleated nonwoven fabric.
  • the distance of the plies of the nonwoven fabric can be controlled by the respective height of the spacers so that different distances can be defined at different locations between two layers.
  • the height increases from a first fold line to a second fold line. In a further advantageous embodiment of the invention, the height decreases to a third fold line again.
  • Fig. 1 is a schematic representation of an apparatus for producing a nonwoven fabric according to an embodiment of the invention
  • Fig. 2 is a schematic plan view of a nonwoven fabric according to first and second embodiments of the invention.
  • Fig. 3a is a schematic side view of the nonwoven fabric according to Fig. 2 according to the first embodiment of the invention
  • FIG. 3b is a schematic side view of a nonwoven fabric according to FIG. 2 according to the second embodiment of the invention.
  • Fig. 4 is a schematic plan view of a nonwoven fabric according to a third or fourth embodiment of the invention.
  • FIG. 5a is a schematic side view of a nonwoven fabric according to the invention according to FIG. 4 according to the third embodiment of the invention.
  • FIG. 5b is a schematic side view of the nonwoven fabric according to the invention according to FIG. 4 according to the fourth embodiment of the invention.
  • Fig. 6 is a schematic plan view of a nonwoven fabric according to a fifth to eighth embodiment of the present invention.
  • FIG. 7a is a schematic side view in the direction of the fold line A of the nonwoven fabric according to the invention according to FIG. 6 according to the fifth embodiment of the invention.
  • FIG. 7b is a schematic side view in the direction of the fold line A of the nonwoven fabric according to the invention according to FIG. 6 according to the sixth embodiment of the invention
  • FIG. Fig. 8a is a schematic side view of the nonwoven fabric according to the invention according to Fig. 6 in the direction of the fold line X according to the seventh embodiment of the invention
  • FIG. 8b is a schematic side view of a nonwoven fabric according to the invention according to FIG. 6 in the direction of the fold line X according to an eighth embodiment of the invention.
  • FIGS. 4 and 5a are schematic representations of a pleated nonwoven fabric according to the third embodiment of the invention according to FIGS. 4 and 5a;
  • Fig. 10 is a schematic representation of a filter with a nonwoven fabric according to the invention as a filter medium.
  • the device according to the invention preferably has a spinning beam 6, on or in which preferably at least one spray nozzle 11 is arranged.
  • the spinning beam 6 or the spray nozzle 11 are supplied with a pressurized liquid base material, preferably a polymer, which is sprayed from the nozzle 11.
  • This sprayed raw material forms a jet 10 which is deposited or collected on the carrier material 12.
  • the spray jet 10 is preferably directed via the spray direction of the spray nozzle 11 and the gravitational force G.
  • the direction and / or the turbulence of the polymer jet 10 is controlled by a fan 7 and / or an exhaust 8.
  • the carrier layer 12 moves relative to the spray bar 6, while a spray jet 10 is sprayed out of or from the spray nozzle or sprays 11.
  • the thickness or the thickness of the nonwoven fabric 1 can thus be influenced by the speed of the carrier layer 12.
  • the carrier layer 12 is guided over two rollers 9a and 9b as a treadmill in a circle.
  • the nonwoven fabric 1 then goes to one end of this treadmill, which is presently formed by the roller 9b, in the next process step and / or is stored or rolled up as web material.
  • the inventive method for producing a nonwoven fabric preferably proceeds as follows: First, a base material is melted. Then this is brought via lines in the spinning beam 6 and to the or the spray nozzles 11. This sprays or spray the base material, which passes through a spray 10 on the carrier layer 12. Structures (not shown) are arranged on the carrier layer 12. The structures on the carrier layer 12 serve as a negative for the later spacers 2 in the nonwoven fabric 1. When collecting the spray jet 10 from the base material on the carrier layer 12, this forms a nonwoven fabric 1, which covers the carrier layer 12 areally. In this case, the structures of the carrier layer 12 are also covered, which give the nonwoven fabric 1 a shape with spacers 2 when it is deposited on the carrier layer 12. The spacers 2 are therefore formed in the primary molding process of the nonwoven fabric 1.
  • the nonwoven fabric 1 is removed from the region of the spray jet 10 by the movement of the carrier layer 12 and gradually cools down.
  • the structures on the carrier layer 12 are preferably elevations and / or depressions. Particularly preferably, the depressions are holes. By gravity G and / or a generated by the fan 7 or the trigger 8 air flow, the material can be deep-drawn into the recess or holes.
  • the spray jet 10 is pulsed over a temporal pulsation of the flow and / or the pressure of the polymer through the at least one spinning beam 6 in time.
  • the thickness or thickness can be varied over the surface of the nonwoven fabric 1 in this way.
  • the structure of the individual fibers of the nonwoven fabric 1 is preferably changed.
  • the structures of the carrier layer 12 are preferably round, oval or polygonal in plan view. However, these may also be particularly preferably grooves and / or grooves which are arranged either transversely or longitudinally to the direction of movement of the carrier layer, Preferably, these grooves and / or grooves may also be interrupted. Preferably, the structures are formed as sections of polygons, spheres, cones or a three-dimensional oval body.
  • the arrangement of the structures is thereby preferably such that spacers 2 of adjacent folds of a fold or plissage either meet or do not meet, depending on the desired spacing and stability of individual layers of the produced nonwoven fabric 1.
  • the structures preferably have a height of from 0.1 to 2 cm, preferably from 0.2 to 1 cm, more preferably from 0.3 to 0.8 cm, more preferably from 0.4 to 0.6 cm and most preferably from 0.5 cm up.
  • the effect according to the invention is not limited to these values of height and also includes their edge regions outside the specified ranges.
  • the carrier layer 12 is preferably made of metal, glass or polymer. Particularly preferred is a glass fiber reinforced plastic. Furthermore, the carrier layer 12 is preferably coated, in particular Teflon-coated. The carrier layer 12 may be formed as a sieve, grid, wire mesh or a smooth surface.
  • the device has a plurality of spinning beams 6.
  • the spraying jets 10 sprayed out by different spinning beams 6 can be sprayed in parallel or in one another.
  • the spray jets 10 of adjacent spinning beams 6 are preferably adjusted so that the respectively discharged base materials are deposited one above the other.
  • the two layers of different base materials can then preferably be solidified together by a further working step, such as calendering or a thermal treatment.
  • the various spinning beams can spray either the same base material or different base materials at the same time.
  • the mixing of the spray jet 10 sprayed out is in this case also produced via the air streams which are generated by the blower 7 or the suction 8.
  • the air flow of the blower 7 sets directly at the outlet the nozzle 11 at.
  • the flow and / or the pressure can be pulsed differently by different spinning beams 6.
  • the nonwoven fabric 1 has substantially planar components or layers 3, i. Surface components, and spacers 2, which rise above the planar components 3 in one and / or other direction.
  • the spacers are preferably shown as circles, ie round. Particularly preferably, the spacers are oval or polygonal. Most preferably, these are formed as grooves or grooves, which preferably extend in the direction of the fold lines A or in the direction of the fold lines X.
  • the spacers are elevations and / or depressions.
  • Two spacers 2 preferably each form a spacer group 4. If the nonwoven fabric 1 is folded along one of the folding lines A or X, the groupings 4 of spacers of adjacent pleating folds do not lie one above the other. Depending on whether the spacers 2 of a grouping 4 lift out of the flat area 3 in the same or opposite direction, these then form spacers 2 to a nearest pleat fold or to the two nearest pleat folds.
  • FIG. 3a the second possibility in FIG. 3b in the side view of the nonwoven fabric 1 according to FIG. 1. If the respective spacers 2 of a grouping 4 are oriented in respectively opposite direction, then a nonwoven fabric 1 is formed, its spacing provides particularly good control over the spacing of individual pleats as the nonwoven is folded along fold lines A or X.
  • a nonwoven fabric 1 can also have a plurality of groupings 4 in a section between in each case two fold lines A, X.
  • the nonwoven fabric 1 according to the invention is preferably a single-layer nonwoven fabric 1.
  • Single-layer in the sense of the invention means that it is not possible to identify two separated layers over the cross section of the nonwoven fabric, as shown in FIGS. 3 a and 3 b, which z. B. be formed by two sequential melt spinning process, when the respective polymer fibers are sequentially deposited on each other.
  • the single layer construction of the nonwoven fabric 1 avoids a problem of delamination of individual layers.
  • the nonwoven fabric 1 has a substantially uniform thickness and internal structure over substantially its entire surface, also in the region of the spacers 2.
  • the nonwoven fabric 1 Despite the ply-ply, it is possible for the nonwoven fabric 1 to have variations in its internal structure across its cross-section.
  • by fabricating the web in a one-step masterbatch process by the melt spinning process such changes are continuous throughout the material. Discrete structural changes, as in the case of two-layer nonwovens, are preferably not present.
  • the nonwoven fabric 1 is preferably pleated along the fold lines A or X in order to be installed as a filter material in a frame or a round filter.
  • the distances of the individual fold lines A, X or their arrangement to the geometry of the spacers 2 and the groupings 4 can be chosen freely. In FIG. 2, essentially any line of symmetry of the nonwoven fabric 1 as a folding line is possible.
  • the distances M, N and O between the spacers 2 and the groupings 4 of spacers can be chosen essentially freely.
  • the distance O is smaller than the distance N, which, in turn, is preferably smaller than the distance M.
  • the height P of the spacers 2 or their extent over the surface of the substantially flat constituent of the nonwoven fabric 3 is preferably 0.1 cm to 2.0 cm, preferably 0.2 cm to 1, 0 cm, particularly preferably 0.3 cm to 0.8 cm, more preferably 0.4 cm to 0.6 cm and most preferably 0.5 cm.
  • the effect of the invention is is not limited to these values of height P and also includes their margins outside the specified ranges.
  • the height P of the spacers 2 depends on their position in the pleating to achieve a uniform pleating as shown in Fig. 10.
  • the height P thereby increases from a first fold line A, X in the direction perpendicular thereto to a second fold line A, X.
  • the height P decreases from the second fold line A, X to a third fold line A, X in turn.
  • the height P of the spacers corresponds substantially to the height of the structures (not shown), which are arranged on the carrier layer 12.
  • the carrier layer 12 serves essentially as a negative image (negative) to the nonwoven fabric formed later thereon, which is the positive image (positive).
  • the thickness of the nonwoven fabric 1 depends essentially on the desired properties. If, as in FIG. 3 b, spacers 2 are present on both sides of the essentially planar constituent 3 of the nonwoven fabric 3, the height or extent of the spacers P, P 'may be the same or may also have a different value.
  • FIGS. 4, 5a and 5b a third and fourth embodiment of the invention are shown.
  • the embodiments illustrated in FIGS. 4, 5a and 5b differ essentially from the embodiments of FIGS. 2, 3a and 3b by the arrangement of the spacers 2 or their groupings 4.
  • FIGS. 5a and 5b are respectively plan views of a nonwoven fabric 1 according to FIG 4 in the direction of the fold lines A and X.
  • the two embodiments of FIGS. 5a and 5b differ in the orientation of the spacers 2 arranged in each case in a row in the direction of the fold lines A.
  • FIGS. 6, 7a, 7b, 8, 8a and 8b differ from the embodiments of FIGS. 4, 5a and 5b by the orientation of the spacers 2.
  • FIGS. 7a and 7b show the alignment of the spacers 2 along the line II-II in FIG. 6, and FIGS. 8a and 8b respectively show the orientations of the spacers along the line I-1.
  • each row of spacers can preferably have the arrangement required to produce the desired spacing between individual layers of a nonwoven fabric 1.
  • a pleated nonwoven fabric 1 according to the third embodiment of the invention is shown in Figs. 4 and 5a. It can be clearly seen that the individual layers of the surface component 3 of the nonwoven fabric 1 are held by the spacers 2 at a defined distance.
  • a preferred filter comprising a nonwoven fabric of the present invention is shown as a filter medium.
  • the illustrated filter has a pleated nonwoven fabric 1 and a frame 15, with which the filter can be mounted at its place of use.

Abstract

L'invention concerne un procédé de fabrication d'un non-tissé (1), en particulier d'un support de filtre ou d'un support de filtre à air en non-tissé, au cours d'un procédé de filage par fusion. Ledit procédé comprend les étapes suivantes consistant à : faire fondre une matière première ; pulvériser la matière première à partir d'au moins une barre de filage (6) ; et collecter la matière première sur une couche de support (12) de manière à former le non-tissé (1). La couche de support (12) présente des structures telles que des entretoises (2) sont formées dans le non-tissé (1).
EP13727050.0A 2012-06-04 2013-06-04 Procédé de fabrication d'un non-tissé Withdrawn EP2855753A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012011065A DE102012011065A1 (de) 2012-06-04 2012-06-04 Verfahren zur Herstellung eines Vliesstoffes
PCT/EP2013/001634 WO2013182296A1 (fr) 2012-06-04 2013-06-04 Procédé de fabrication d'un non-tissé

Publications (1)

Publication Number Publication Date
EP2855753A1 true EP2855753A1 (fr) 2015-04-08

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP13727050.0A Withdrawn EP2855753A1 (fr) 2012-06-04 2013-06-04 Procédé de fabrication d'un non-tissé

Country Status (4)

Country Link
US (1) US20150128545A1 (fr)
EP (1) EP2855753A1 (fr)
DE (1) DE102012011065A1 (fr)
WO (1) WO2013182296A1 (fr)

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