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EP1226297B1 - Verfahren zur herstellung eines vliesstoffes mit hydrodynamischer vernadelung - Google Patents

Verfahren zur herstellung eines vliesstoffes mit hydrodynamischer vernadelung Download PDF

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Publication number
EP1226297B1
EP1226297B1 EP00964353A EP00964353A EP1226297B1 EP 1226297 B1 EP1226297 B1 EP 1226297B1 EP 00964353 A EP00964353 A EP 00964353A EP 00964353 A EP00964353 A EP 00964353A EP 1226297 B1 EP1226297 B1 EP 1226297B1
Authority
EP
European Patent Office
Prior art keywords
web
fibers
fibres
raised
nonwoven
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.)
Expired - Lifetime
Application number
EP00964353A
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English (en)
French (fr)
Other versions
EP1226297A1 (de
Inventor
Frédéric NOELLE
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.)
Rieter Perfojet SAS
Original Assignee
Rieter Perfojet SAS
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Publication date
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Publication of EP1226297A1 publication Critical patent/EP1226297A1/de
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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
    • D04H18/00—Needling machines
    • D04H18/04—Needling machines with water jets
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/425—Cellulose series
    • D04H1/4258—Regenerated cellulose series
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • D04H1/46—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
    • D04H1/492—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres by fluid jet
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • D04H1/46—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
    • D04H1/492—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres by fluid jet
    • D04H1/495—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres by fluid jet for formation of patterns, e.g. drilling or rearrangement
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/10—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between yarns or filaments made mechanically
    • D04H3/11—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between yarns or filaments made mechanically by fluid jet
    • 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
    • D04H5/00—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length
    • D04H5/02—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length strengthened or consolidated by mechanical methods, e.g. needling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/637—Including strand or fiber material which is a monofilament composed of two or more polymeric materials in physically distinct relationship [e.g., sheath-core, side-by-side, islands-in-sea, fibrils-in-matrix, etc.] or composed of physical blend of chemically different polymeric materials or a physical blend of a polymeric material and a filler material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/689—Hydroentangled nonwoven fabric
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/697—Containing at least two chemically different strand or fiber materials
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/697—Containing at least two chemically different strand or fiber materials
    • Y10T442/698—Containing polymeric and natural strand or fiber materials

Definitions

  • One of the main problems that arises when producing nonwovens is that of achieving the cohesion of the structure in order to give the products mechanical characteristics depending on the intended application, while maintaining or conferring certain physical characteristics, such as voluminosity, touch, appearance ....
  • such cohesion is obtained by intermingling the fibers in the thickness of the sheet by the action of fluid jets, and more particularly jets of water under pressure.
  • this technique consists in interleaving the elementary fibers together by means of the action of pressurized water jets which act on the fibrous structure in the manner of needles and make it possible to reorient a part of the fibers. fibers constituting the web in the direction of the thickness.
  • wet wipes referred to in this technical sector by the English term “ wet wipes " as well as in the field of hygiene.
  • the invention is particularly suitable for producing such articles and, in the following description, it will be described more particularly for obtaining such products.
  • nonwoven webs made entirely of absorbent fibers, such as cellulosic fibers, including viscose.
  • absorbent fibers such as cellulosic fibers, including viscose.
  • a mixture of synthetic fibers (polyester, polypropylene) and artificial fibers (viscose) is preferably used.
  • Such a product has good mechanical strength characteristics, characteristics essentially provided by the synthetic fibers, as well as good absorption and liquid retention characteristics imparted by the cellulosic fibers.
  • the treatment consists in treating a base ply composed of elementary fibers of the same nature or of a different nature, compressing and moistening this base ply and then intermingling the fibers by means of at least one ramp of contiguous jets of water under high pressure acting on the base web.
  • the base ply is positively advanced on an endless porous support in motion and is brought to the surface of a perforated rotary cylindrical drum inside which a partial vacuum is applied.
  • the base web is mechanically compressed between the porous support and the rotating drum, both of which are advancing substantially at the same speed.
  • a water curtain is passed over the sheet which passes successively through the porous support, the compressed base ply and the perforated carrier drum which draws in excess water.
  • the elementary fibers are intermixed by subjecting the compressed and wet web to the action of at least one ramp of jets of water under high pressure.
  • the binding is carried out by means of several successive ramps of water jets which act either on the same face, or alternatively against the two faces of the sheet, the pressure inside the ramps and the speed of the jets emitted varying from one ramp to the next, and most often progressively.
  • the perforated roll preferably comprises micro-perforations distributed randomly.
  • the nonwoven structure may be subjected to a second treatment exerted on the reverse side.
  • the method according to the invention is characterized in that, after treatment of binding by means of water jets and before drying and reception, the pre-bonded and moistened web is transferred to an additional set of treatment by action of one or several series of water jets, said assembly comprising a mobile suction surface, in the form of a drum covered with a perforated structure, constituted by a wire mesh fabric, shaped to present a succession of raised areas and hollow.
  • the first water jet treatment is carried out in accordance with the teachings of FR-A-2 730 246 and FR-A-2 734 285, the content of which is incorporated herein. description as needed.
  • a rotary cylindrical perforated, aspirating drum is constituted by a honeycomb structure covered with a perforated sheet which rotates around a second coaxial cylindrical drum, fixed, hollow, connected to a source of partial vacuum to form a suction box below the areas where the jets of water act.
  • said drum is covered with a structure that is also perforated or porous in itself, having raised and recessed areas, this structure preferably being constituted by a fabric, in the form of a sleeve removable.
  • a cover structure of the suction drum it will be preferred to use a woven fabric, made for example of bronze son and which has the characteristic of being embossed.
  • the void ratio with respect to the surface is between 10% and 50%, and the overall height between the bottom of the hollow parts and the upper part of the raised areas is generally between 0.5 mm. and 2 mm.
  • the configuration of the reliefs and hollows that will present such a fabric can be of any type, for example be in the form of chevrons, patterns with precise contours (circular, square) or embossed appearance, crepe ...
  • the complex before treatment on the embossed surface, may optionally receive a second jet bonding treatment carried out in a manner similar to the previous one, but on the opposite face.
  • the nonwoven After treatment, the nonwoven, still in the wet state, is transferred to a voicing zone, followed by a drying zone consisting of a through-air drum. It is finally received in the form of a winding.
  • Such a method can be implemented for fibrous webs of any composition, made from natural, artificial and / or synthetic fibers, alone or as a mixture.
  • absorbent nonwovens For the production of absorbent nonwovens, it may be envisaged to produce a sheet consisting entirely of viscose fibers.
  • absorbent artificial fibers viscose
  • synthetic fibers such as polyester or polypropylene
  • the title of the elementary fibers and their length are preferably similar and are, for example, between 1 dtex and 3.3 dtex, the length being between 20 mm and 60 mm.
  • This pneumatic lapping and bonding operation is carried out before the shaping treatment on the embossed assembly, the jets of this assembly acting preferably against the surface coated with wood fibers.
  • a production line for producing a nonwoven according to the method according to the invention consists essentially of a set, designated by the general reference (1), allowing to carry out by carding or other similar technique, a web may be constituted either entirely of artificial fibers, in particular viscose, or a mixture of artificial fibers and synthetic fibers, such as polyester or polypropylene.
  • a porous conveyor belt (11) consisting for example of an endless fabric made of synthetic monofilament, in particular polyester, which has a porosity between 30 and 60%, that is to say a ratio between the solid surfaces and the empty surfaces of between 30 and 60%, preferably close to 50%.
  • This porous support (11) is associated, in a manner similar to the teachings of FR-A-2 730 246, with a water jet treatment unit that allows, on the one hand, compression and wetting of the web (10) formed and, secondly, to submit this sheet to the action of water jet ramps.
  • a water jet treatment unit that allows, on the one hand, compression and wetting of the web (10) formed and, secondly, to submit this sheet to the action of water jet ramps.
  • Such an assembly essentially comprises a rotary cylindrical drum designated by the general reference (20) bearing against the surface of the conveyor belt (11).
  • a first water jet ramp (21) is disposed below the support (11) and allows the prewetting of the web (10). This ramp is disposed at a distance between 70 and 100 mm of the porous support (11) and forms a water curtain for wetting the compressed web and resulting in a slight first intermingling of the web.
  • the drum (20) consists of a conventional rotating cylinder with honeycomb structure (not shown in the accompanying figures), which is covered with a metal sheet (22) having micro-perforations, distributed randomly to its surface or by a woven structure.
  • This rotating cylinder surrounds a second fixed, hollow coaxial cylindrical drum (23) connected to a source of partial vacuum to form a suction box, the suction being exerted through slots (26) located opposite the zone of action of water jets.
  • the ply (10) After prewetting by means of the ramp (21), and as is apparent from FIGS. 1 and 1a, the ply (10) is subjected to the action of pressurized water jets (27) coming from two conventional ramps (24). , 25).
  • These ramps (21,24,25) are formed of contiguous injectors arranged at predetermined distances from each other.
  • the drum Opposite each ramp (21,24,25), the drum comprises a slot (26) which extends over the entire length of a generatrix, whose width is in general between 5 mm and 30 mm and from which is recovered water jets (27).
  • a second assembly (28) made according to the invention After bonding to the assembly (20), the sheet is subjected to the action of a second assembly (28) made according to the invention, and whose general structure emerges from FIG. 1b.
  • This assembly (28) is constituted by a suction rotary drum (29), also constituted by a cylindrical honeycomb structure, not shown in Figure 1b, and which supports, not a micro-perforated strip as for the treatment unit (20), but a coating constituted by a perforated plate (29).
  • the perforations of this plate (29) can have a diameter of 3 mm, the spacing between two consecutive holes being 4 mm and the orifices being shifted from one row to the next.
  • the perforated surface (29) is coated with a perforated structure (30), in the form of a sleeve, having a succession of raised and recessed areas.
  • This perforated structure (30) consists of a perforated wire fabric, more particularly bronze wire, having an opening ratio of between 10% and 50%, said fabric having been embossed, as is apparent from FIGS. 5, to include a succession of raised and recessed areas.
  • These raised and recessed zones may have a regular structure, for example a chevron shape as shown in FIG. 3, or a configuration forming irregular patterns giving for example a creped appearance as illustrated by FIG.
  • the pre-bonded sheet is restructured by the action of one or more series of jets, coming from conventional hydraulic injectors in the number of two in the present case. Under the action of these jets, the sheet matches the configuration of the raised and recessed areas of the perforated structure (30).
  • the treated web (31) is fed to a conveyor (32) where the water is removed, for example by means of a suction box disposed below the conveyor (32), and then dried by passage on a through air cylinder (33) and having a temperature of the order of 150 ° C before being received in the form of a winding (34).
  • FIG. 2 illustrates a second embodiment of a production line of a nonwoven, allowing the production of composite webs, synthetic fibers - cellulosic fibers, wood for example, adapted for the implementation of the process according to the invention. 'invention.
  • Figures 2a, 2b, 2c and 2d are enlarged views of the circled treatment areas in Figure 2.
  • such a production line is produced in accordance with the teachings of document FR-A-2 781 818, which makes it possible to produce nonwovens made of a mixture of elementary fibers of different types, and more particularly of a mixture of synthetic fibers associated with cellulosic fibers, especially wood fibers.
  • a mixed nonwoven is produced in the following manner. Firstly, by carding (1) or other conventional technique, a first web (10) is made from chemical fibers. The fibrous web (10) produced is then subjected to a water jet tying treatment on a first treatment unit designated by reference (40).
  • the two faces of the fibrous web (10) are subjected to the action of jets of water by passing around two suction cylinders, the first having micro-perforations on the surface, and the second being coated a coarse canvas as shown in Figure 2a.
  • the complex structure, layer of synthetic fibers (10) coated with natural fibers (52), is then subjected to the action of a new series of water jets through a set designated by the general reference ( 53), positioned above a second conveyor.
  • This treatment ensures not only the binding but also the prewetting of the sheet necessary for the implementation of the process according to the invention.
  • the complex structure thus produced is then treated according to the invention on an assembly, designated by the general reference (28), illustrated by FIG. 2d, which assembly is similar to that illustrated in FIG. 1b, and which has been previously described. .
  • a mixed nonwoven (31) is obtained, comprising raised and recessed patterns, which is received on a carpet (32) to be subsequently dried at (33) and received at (34).
  • the process according to the invention is carried out on an installation as illustrated by FIGS. 1, 1a and 1b, in order to produce a product according to the invention consisting of a single type of hydrophilic fibers. namely, viscose fibers.
  • This sheet (10) is transported by a conveyor belt (11) on a hydraulic binding unit of the type sold under the name " Jetlace 2000" adapted for carrying out the process according to the invention.
  • the sheet (10) is compacted between the conveying conveyor (11) and a first binding cylinder (20) coated with a micro-perforated envelope, the holes being arranged randomly as described in the French patent 2,734,285.
  • the web is wetted by means of the ramp (21) located behind the transport conveyor just after the compacting point, which ramp is arranged perpendicularly to the generatrix of the cylinder.
  • the bonded veil undergoes an additional treatment according to the invention (FIG. 1b) by passing it over a cylinder also coated with a perforated envelope (29) on which is disposed a sleeve constituted by a bronze fabric (30) having 15 threads / cm and 15 frames / cm, having a diameter of 0.24 mm and having a void ratio of 40.8%.
  • This bronze sleeve (30) is embossed so as to have a herringbone pattern (as shown in Figure 5), whose depth is of the order of one millimeter and a half (1.5 mm).
  • the fibrous web is subjected to the action of two successive hydraulic injectors delivering jets of 120 microns in diameter at a speed of 200 m / second, the jets being spaced apart from each other by 0.6 mm.
  • the web is then transferred onto a suction belt (32) connected to a vacuum generator, then dried at a temperature of 145 ° C. in a through-air oven (33), to be finally received, for example in the form of a winding (34).
  • a nonwoven weighs about 60 g / m 2 and has a pattern in the form of chevrons (35), as shown in Figure 4, this pattern having excellent definition. It is permanent and resistant to friction.
  • the treatment conditions are the same as those given in Example 1.
  • a product consisting of a blend of viscose fibers and 70/30 polyester is produced.
  • the fibers have a title of 1.7 dtex and a length of 38 mm.
  • the formed web weighs, at the outlet of the card, about 65 g / m 2 and after treatment 60 g / m 2 .
  • This example illustrates a concrete embodiment of a nonwoven according to the invention, consisting of a mixture of synthetic fibers and natural fibers, and more particularly of cellulosic fibers, especially wood.
  • a production line is used, as illustrated in FIG. 2 and which, in a general manner, is carried out in accordance with the teachings of document FR-A-2 781 818, except it comprises, before drying in (33) and after treatment of binding and prewetting performed by the jets (53), an additional set of treatment (28) by the action of water jets, said assembly comprising a suction mobile surface , in the form a drum covered with a perforated structure (30), constituted by a woven fabric made of wire, shaped to present a succession of raised and recessed areas
  • the web is compacted between this conveyor and a first assembly designated by the general reference (40) and which comprises a binding cylinder coated with a microperforated envelope, the holes of which are randomly arranged. After compaction, the web is pre-wetted via a ramp located behind the transport conveyor (11) just after the compaction point and arranged perpendicularly to the generatrix of the cylinder.
  • the veil thus compacted and wet is subjected to the action of two hydraulic injectors projecting jets of water of 120 microns in diameter, at increasing speeds of 78 and 94 m / s, the jets of water being spaced apart from each other. others of 1.2 mm.
  • the web is then introduced on the assembly designated by the general reference (48) and which comprises a second cylinder coated with a coarse fabric made of 9 threads per centimeter, made of bronze, with a rectangular section of 0.33 mm by 6, 64 mm in chain direction and 9 threads per centimeter, also in 0.46 mm diameter bronze in the weft direction.
  • Two hydraulic injectors are arranged above this cylinder. They project on the veil jets of water of 120 microns in diameter at speeds of 100 m / s, the jets being spaced from each other by 0.5 mm.
  • the veil is then expressed using a suction box connected to a vacuum generator.
  • the product at the exit of this conveyor has a pyramidal type embossed appearance, with areas of different fiber density.
  • the web is then introduced onto a pneumatic lapping machine (51), which deposits 35 g / m 2 of cellulose fibers.
  • the web is introduced on another conveyor (54) above which are arranged four hydraulic injectors (53), projecting jets of water of 120 microns in diameter spaced from each other by 0.6 mm at speeds of 150 m / s.
  • the product thus obtained is thus in the form of a pre-bonded and moistened web which is then transferred to an additional processing unit, designated by the general reference (28).
  • an additional processing unit designated by the general reference (28).
  • Such an assembly comprises a cylinder coated with a bronze sleeve identical to that used in Example (1), and which is embossed so as to have a pattern in the form of chevrons.
  • the fibrous web is subjected to the action of two successive hydraulic injectors, delivering jets of 120 microns in diameter at a speed of 60 m / s, the jets being spaced apart from each other by 0.6 mm.
  • the product thus obtained according to the process according to the invention is then transferred to a suction belt (32), connected to a vacuum generator, then dried at a temperature of 160 ° C., in a through air oven, to be finally received. in the form of a winding (34).
  • examples 1 and 2 they are made on an installation in which the treatment unit (28) as illustrated in FIG. 1b is produced by means of a second series of jet treatments, as illustrated.
  • Figure 1c it is say on a conventional suction drum, whose surface coating is constituted by a micro-perforated sheet (22), similar to that used for the preloading treatment.
  • Example 3 it is performed on a production line, as shown in Figure 2, but not comprising a treatment unit (28).
  • the products obtained according to the invention and those of the comparative examples are tested to determine the thickness, the density, the resistance in the long direction (SL) and in the transverse direction (ST), the elongation in the long direction. and in the cross direction and the rate of water absorption.
  • Example 1 comparative Example 2 comparative Example 3 Comparative Weight g / m2 60 60 60 60 55 55 Thickness in mm 0.71 0.50 0.82 0.58 0.61 0.44 Density in g / cm3 0,085 0.12 0.073 0,103 0.090 0,125 Resistance Dry 115 120 112 114 108 110 long direction (SL) N / 50mm Wet 58 59 98 92 99 101 Resistance Dry 21 20 18 22 21 19 cross direction (ST) N / 50mm Wet 15 14 17 20 18 17 Elongation Dry 25 29 30 27 31 30 long meaning (SL) in% Wet 26 28 35 33 30 29 Elongation Dry 123 134 129 133 185 189 cross direction (ST) in% Wet 99 100 124 126 184 185 Absorption rate g / g 928 906 850 826 833 824
  • the materials made according to the invention have the advantage of being much thicker to equal weight.
  • the new products have a flattering and advantageous textile aspect that increases their commercial value.
  • embossed bronze fabric comprising 15 warp and weft yarns, the diameter of which is 0.24 mm and the opening ratio of 40.8%, it could be envisaged to use other types of embossed structures.
  • the embossed bronze fabric has 23.5 threads / cm both in warp and weft, said threads having a diameter of 0.19 mm and the opening ratio being 30, 5%.
  • the method according to the invention can also be used to obtain mixed nonwovens consisting of a mixture of different nature.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Nonwoven Fabrics (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)

Claims (7)

  1. Verfahren zur Herstellung eines Vliesstoffes, der zumindest teilweise aus wasseraufnehmenden Grundfasern besteht, das die kontinuierlichen Schritte aufweist:
    • Herstellen eines Faservlieses (10) durch Kardieren oder eine andere konventionelle Technik;
    • Komprimieren und Befeuchten besagten Vlieses;
    • Unterziehen des befeuchteten und komprimierten Vlieses einer Bearbeitung zum Binden mittels Wasserstrahlen, die gegen mindestens eine der Seiten gerichtet sind, wobei der Vlies durch eine drehbare Trommel, die in zufälliger Weise verteilte Mikroperforationen aufweist, gestützt ist, wobei ein Teilvakuum im Innern besagter Trommel erzeugt wird;
    • Bringen besagten gebundenen Vlieses zu einer Anordnung (32, 33) , die seine Entwässerung und seine Trocknung ermöglicht vor seiner Entgegennahme insbesondere in Form einer Aufwicklung,
    dadurch gekennzeichnet, dass, nach der Behandlung zum Binden (20) mittels Wasserstrahlen und vor der Trocknung und Entgegennahme, der vorgebundene und befeuchtete Vlies zu einer zusätzlichen Anordnung zur Behandlung (28) durch Bearbeitung mit einer oder mehreren Reihen von Wasserstrahlen gebracht wird, wobei besagte Anordnung eine saugende bewegte Oberfläche in Form einer Trommel aufweist, die mit einer abnehmbaren, eine durchbrochene Struktur (30) aufweisende Manschette bedeckt ist, die durch ein aus Bronzefäden gewobenes Tuch gebildet ist, das eingerichtet ist, eine Folge von Zonen mit Hervorhebungen und Gräben aufzuweisen, wobei die Hervorhebungen durch Prägung erhalten werden, das Verhältnis des Zwischenraums in Bezug auf die Oberfläche zwischen 10 und 50 % liegt, und die Gesamthöhe zwischen dem Boden der Grabenbereiche und dem höheren Bereich der hervorgehobenen Zonen zwischen 0,5 und 2 mm beträgt.
  2. Nichtgewebter Vliesstoff, der eine Folge von Zonen mit Hervorhebungen und Gräben aufweist, welche durch Ausführung des Verfahrens nach Anspruch 1 erhalten wurden, wobei die Gesamthöhe zwischen dem Boden der Grabenbereiche und dem höheren Bereich der hervorgehobenen Zonen zwischen 0,5 und 2 mm beträgt.
  3. Nichtgewebter Vliesstoff nach Anspruch 2, dadurch gekennzeichnet, dass er vollständig aus Viskose-Fasern besteht.
  4. Nichtgewebter Vliesstoff nach Anspruch 2, dadurch gekennzeichnet, dass er aus einer Mischung von absorbierenden Kunstfasern und Synthetikfasern besteht.
  5. Nichtgewebter Vliesstoff nach Anspruch 2, dadurch gekennzeichnet, dass er auf chemischen, künstlichen und/oder sythetischen Grundfasern, alleine oder als Mischung, basiert und mit Naturfasern wie Holzfasern verbunden ist.
  6. Nichtgewebter Vliesstoff nach Anspruch 5, dadurch gekennzeichnet, dass die Hervorhebungen vom Krepp-Typ sind.
  7. Verwendung eines nichtgewebten Vliesstoffes nach einem der Ansprüche 2 bis 6 als Wischstoff oder als Trägermaterial für Feuchttücher.
EP00964353A 1999-10-05 2000-09-22 Verfahren zur herstellung eines vliesstoffes mit hydrodynamischer vernadelung Expired - Lifetime EP1226297B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9912601 1999-10-05
FR9912601A FR2799214B1 (fr) 1999-10-05 1999-10-05 Procede pour la realisation de nappes non tissees dont la cohesion est obtenue par l'action de jets de fluide
PCT/FR2000/002633 WO2001025522A1 (fr) 1999-10-05 2000-09-22 Procede pour la realisation de nappes non tissees dont la cohesion est obtenue par l'action de jets de fluide

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EP4253615A1 (de) * 2022-03-28 2023-10-04 Orion Financement Vorrichtung zur bildung von perforierten cordvliesen

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US6796010B2 (en) 2004-09-28
DK1226297T3 (da) 2006-10-16
FR2799214A1 (fr) 2001-04-06
AU7530400A (en) 2001-05-10
DE60028804T2 (de) 2007-06-14
DE60028804D1 (de) 2006-07-27
WO2001025522A1 (fr) 2001-04-12
EP1226297A1 (de) 2002-07-31
US20020160681A1 (en) 2002-10-31
ATE330049T1 (de) 2006-07-15
FR2799214B1 (fr) 2001-11-16
ES2265979T3 (es) 2007-03-01
US20040158962A1 (en) 2004-08-19

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