EP0148033B1 - Nichtgewobene Stoffbahnen - Google Patents

Nichtgewobene Stoffbahnen Download PDF

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Publication number
EP0148033B1
EP0148033B1 EP84309135A EP84309135A EP0148033B1 EP 0148033 B1 EP0148033 B1 EP 0148033B1 EP 84309135 A EP84309135 A EP 84309135A EP 84309135 A EP84309135 A EP 84309135A EP 0148033 B1 EP0148033 B1 EP 0148033B1
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EP
European Patent Office
Prior art keywords
range
batt
nonwoven fabric
staple fibers
fabrics
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EP84309135A
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English (en)
French (fr)
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EP0148033A3 (en
EP0148033A2 (de
Inventor
Birol Kirayoglu
Sang-Hak Hwang
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EIDP Inc
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EI Du Pont de Nemours and Co
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Priority claimed from US06/568,174 external-priority patent/US4556601A/en
Application filed by EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of EP0148033A2 publication Critical patent/EP0148033A2/de
Publication of EP0148033A3 publication Critical patent/EP0148033A3/en
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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
    • D04H1/44—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
    • D04H1/42—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
    • D04H1/4326—Condensation or reaction polymers
    • D04H1/4334—Polyamides
    • 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
    • D04H1/4326—Condensation or reaction polymers
    • D04H1/435—Polyesters

Definitions

  • This invention relates to nonapertured, heavyweight nonwoven fabric made from hydraulically entangled staple fibers of synthetic organic polymer. More particularly, the invention concerns such a fabric having unusually strong tensile characteristics and high resistance to disentanglement.
  • Nonwoven fabrics in which hydraulically entangled staple fibers of synthetic organic polymer form a stable, nonapertured fabric without the presence of resin binder of fiber-to-fiber melt bonds are known in the art. Such fabrics have been manufactured commercially with unit weights that are usually less than 4 oz/yd 2 [136 g/m 2 ]. Bunting et al, U.S. Patents 3,493,462, 3,508,308 and 3,560,326 disclose a wide variety of such fabrics with unit weights as high as about 20 ozlyd 2 [680 g/m 2 ].
  • the commercially manufactured nonapertured fabrics of hydraulically entangled staple fibers are strong and exhibit strip tensile strengths of as high as about 8.5 (Ib/in)/oz/yd 2 ) [0.44 (N/cm)/(g/m 2 )].
  • the heavy-weight fabrics of this type which were disclosed by Bunting et al were relatively weak.
  • such heavyweight fabrics had strip tensile strengths of 4.39 (Ib/in)/(oz/yd) [0.226 (N/cm)/g/m 2 )] at a weight of 6.7 oz/yd 2 [227 g/m 2 ] and 1.3 and 1.1 (lb/in)/(ozlyd 2 ) [0.067 and 0.059 (N/cm)/(glm 2 )] for weights of 10 and 20 ozlyd 2 [339 and 678 g/m 2 ], respectively.
  • the present invention provides an improved heavy-weight, nonapertured nonwoven fabric which consists essentially of hydraulically entangled staple fibers of synthetic organic polymer.
  • the improvement comprises the fabric having in combination a unit weight in the range of 200 to 850 g/m 2 [6-25 oz/yd 2 ], a grab strength of at least 160 N/cm [91 Ib/in], a strip tensile strength of at least 0.26 (N/cm)/(g/m 2 ) [5 (lb/in)/ (ozlyd 2 )] and a resistance to disentanglement of at least 50 alternate extension cycles.
  • the fabric combines a unit weight in the range of 240 to 510 g/m 2 [7-15 oz/yd 2 ], a grab strength in the range of 245 to 875 N/cm [140-500 Ib/in], a strip tensile strength in the range of 0.36 to 0.77 (N/cm)/(g/m 2 ) [7-15 (lb/in)/oz/ yd 2) and a resistance to disentanglement of at least 90 alternate extension cycles.
  • the preferred fabrics have 3 to 10 jet tracks per centimeter [7.5-25 per inch].
  • the preferred staple fibers are of 1 to 18 dtex [0.9-16 den] and of 0.6 to 5 cm [1/4 to 2 inch] length.
  • Preferred polymers for the staple fibers are poly-(p-phenylene terephthalamide), poly(m-phenylene isophthalamide) or poly(ethylene terephthalate).
  • the invention also provides a novel process for preparing heavy-weight, nonapertured, nonwoven fabric by treating batts of staple fibers of synthetic organic polymer with rows of fine columnar streams of water while the batts are supported on a foraminous screen and are moving perpendicular to the rows of streams.
  • the process is characterized by, for stronger fabrics, preparing the fabric from batts having a unit weight of 200 to 850 g/m 2 and consisting essentially of staple fibers having a length in the range of 0.6 to 5 cm and a decitex in the range of 1 to 18, the batts being treated immediately after preliminary consolidation and wetting by a row of streams which forces portions of staple fibers from one surface of the batt through the thickness of the batt to the opposite surface of the bat, said row of streams being spaced at a frequency in the range of 3 to 10 per centimeter and being supplied from orifices having diameters in the range of 0.13 to 0.22 mm, whereby an improved heavy-weight, nonapertured nonwoven fabric as defined above is produced.
  • the batt unit weight is in the range of 240 to 510 g/m 2
  • the fiber length is in the range of 1.3 to 3.8 cm
  • the fiber decitex is in the range of 1.4 to 2.5 dtex
  • the orifice frequency is in the range of 3 to 6 per cm
  • the streams are supplied at a pressure in the range of 6890 to 22740 kPa.
  • the term "heavy-weight” means a nonapertured nonwoven fabric of hydraulically entangled staple fibers that has a unit weight in the range of 200 to 850 g/m 2 [6-25 ozlyd 2 ].
  • the key advantageous distinction of the products of the present invention is illustrated in the graph of the attached drawing.
  • the shaded area represents the nonapertured nonwoven fabrics of hydraulically entangled staple fibers of the prior art.
  • the individual points shown on the graph represent the strip tensile data given in detail hereinafter in the Examples. Note the extraordinarily higher tensile strengths of the heavy-weight fabrics of the invention. These strong fabrics of the invention also possess excellent grab strengths and resistance to disentanglement.
  • the staple fibers which are suitable for use in the nonapertured nonwoven fabric of the present invention are in the range of 1 to 18 dtex [0.9 to 16 denier] and in the range of 0.6 to 5 cm [1/4-2 inches] long.
  • the dtex range is 1.4 to 2.5 dtex [1.25-2.25 denier] and the length range 1.3 to 3.8 cm [1/2-1-1/2 inches]. Fibers of circular cross-section are preferred.
  • the staple fibers may be of any synthetic organic polymer.
  • Preferred polymers include poly(p-phenylene terephthalamide), poly(m-phenylene isophthalamide) and poly(ethylene terephthalate). Fabrics made of hydraulically entangled fibers of each of the polymers are illustrated in the Examples.
  • the heavy-weight nonapertured nonwoven fabric of the present invention possesses a unique advantageous combination of characteristics, which includes a grab strength of at least, 160 N/cm [91 Ib/in], preferably in the range of 245 to 875 N/cm [140 to 500 lb/in], a strip tensile strength of at least 0.26 (N/cm)/(g/ m 2 ) [5 Ib/in)/(oz/yd 2 )], preferably in the range of 0.36 to 0.77 (N/cm)/(g/m 2 ) [7-15 (lb/in)/ozlyd 2 )] and the resistance to disentanglement is at least 50 alternate extension cycles, preferably at least 90 cycles.
  • the preferred manner in which the hydraulic entanglement treatment is performed in manufacturing the preferred fabrics of the present invention results in the nonapertured fabrics having a repeating pattern of closely spaced lines of fiber entanglement, called "jet tracks".
  • the jet tracks are readily visible under low magnification.
  • the preferred fabrics of the invention have between 3 and 10 jet tracks per cm [7.5 to 25 per inch] and most preferably between 3 and 6 jet tracks per cm [7.5 to 15 per inch].
  • the staple fibers are formed into starting batts of 200 to 850 g/m 2 [6 to 25 ozlyd 2 ] by known techniques which employ Rando-webbers or air-laydown equipment such as that disclosed in Zafiroglu, U.S. Patent 3,797,074.
  • a continuous hydraulic entanglement treatment is then performed with the staple-fiber starting batt in place on a foraminous support, such as a woven wire screen.
  • the batt In the hydraulic entanglement treatment, the batt is exposed to a series of fine, columnar streams of water supplied to one surface of the batt and then to the other surface of the batt.
  • the streams of water are supplied from a row of orifices located a short distance, usually about 2.5 cm [1 inch] above the surface of the batt.
  • Orifices of the type disclosed in Dworjanyn, U.S. Patent 3,403,862, are employed. Preferred orifices have a diameter in the range of 0.13 to 0.22 mm [0.005 to 0.009 inch].
  • the orifices are spaced to produce at least 3 jet tracks per cm [7.5 per inch] and no more than 10 jet tracks per cm [25 per inch], and most preferably no more than 5 jet tracks per cm [12.7 per inch].
  • portions of the staple fibers initially located at one surface of the batt are driven by the water jets through the thickness of the batt to the opposite surface of the batt.
  • This important rearrangement of the fibers is performed immediately after an initial wetting and preliminary light consolidation of the batt. If the starting batt has sufficient coherency as supplied to the entanglement step, the very first row of water streams can perform this important rearrangement, if supplied at sufficient pressure and if they impact the batt with sufficient force.
  • the use of such jets on wide spacings i.e., no more than 10/cm results in deeper penetration of the streams into the batt with less interference from adjacent streams than would be obtained with closer spaced jets.
  • the highest pressures be supplied to the first row of jets (or the first row after the initial wetting operation).
  • the pressure to this first row of jets is in the range of 6890 kPa to 22740 kPa [1000-3300 psi]. This prevents the fibers at the surface of the batt from immediately forming a dense, tightly entangled surface layer, which then resists water-jet penetration and does not allow portions of fibers from one surface of the batt to be forced through the thickness of the batt to the opposite surface.
  • the remainder of the entanglement process can be performed in the known manner. Even if closer spaced jets are used in the remaining portion of the hydraulic entanglement procedure, the jet tracks produced by the initial high impact jets are not erased or obscured.
  • the preferred hydraulic-jet treatment just described in comparison to the other methods illustrated herein is believed to result in stronger, better entangled and more delamination-resistant heavy-weight nonwoven fabrics.
  • Staple fiber blends of mixed lengths and/or mixed decitex usually are more readily made into fabrics of the invention than fibers of substantially only one length and decitex.
  • blends of staple fibers may be formed into fabrics of the invention with less total expenditure of energy per unit weight of fabric, with less total energy impact product, and with lower maximum jet pressures. Heavier, longer and stiffer fibers are more difficult to rearrange and entangle.
  • Tensile properties are measured on an Instron tester at 70°F and 65% relative humidity.
  • Strip tensile strength is measured in general accordance with ASTM Method D-828-60 on a 1/2 inch [1.27 cm] wide by 4 inch [10.16 cm] long sample, using a 2 inch [5.08 cm] gauge length and an elongation rate of 50% per minute.
  • Disentanglement resistance of nonapertured nonwoven fabric was measured in cycles by the Alternate Extension Test described by Johns & Auspos, "The Measurement of the Resistance to Disentanglement of Spunlaced Fabrics," Symposium Papers, Technical Symposium, Nonwovens Technology-Its Impact on the 80's, INDA, New La, Louisiana, 158-162 (March 1979).
  • the load applied to the test sample in the .machine direction of the fabric i.e., the vertical load on the tester
  • the load- applied in the cross-machine direction was one-half that applied in the machine direction.
  • batts of staple fibers are given a hydraulic jet treatment to from strong, heavy-weight fabrics of the invention.
  • Different sets of orifices are employed to provide columnar streams of water to the batts, while the batts are supported on screens, under which means are provided for removing the water.
  • the orifices are arranged in rows perpendicular to the direction of batt travel and are located about 1 inch (2.5 cm) from the surface of the batt. Five sets of orifices and five different screens are employed. These orifice sets are described as follows:
  • orifice set A, B, C and E all the orifices are located in a single row, but in set D the orifices are arranged in two staggered rows spaced 0.04 inch [0.10 cm] apart with each row containing 20 orifices/ inch [7.9/cm].
  • This example illustrates the invention with heavy-weight, nonapertured, jet-tracks nonwoven fabrics of hydraulically entangled staple fibers of poly(p-phenylene terephthalamide).
  • the fabrics have outstanding tensile characteristics.
  • Two batts of poly(p-phenylene terephthalamide) staple fibers were prepared. Each batt consisted of three layers of webs that were formed on a Rando-webber air laydown machine from 3/4 inch [1.9 cm] long and 1.5 denier [1.7 dtex] T-29 Kevlar® aramid fibers. The fibers were commercially available from E.I. Du Pont de Nemours and Company. Batt 1-a weighed 14.7 ozlyd 2 [498 g/m 2 ] and Batt 1-b weighed 16.4 oz/yd 2 [556 g/m 2 ].
  • Each batt was then placed on Screen C and forwarded at a speed of 10 yards per minute [9.14 meters/min] under rows of columnar jets of water supplied for orifice sets C.
  • Supply pressure to successive rows of jets was 500 psi [3450 kPa] to the first row of jets followed by 3,300 psi [22,740 kPa] to each of the next three rows of jets.
  • the same sequence of jet treatments was then given through the opposite surface of the batt.
  • Table I lists the total energy-impact product (Exl) and the total energy expended in the hydraulic jet treatment along with properties of the resultant nonapertured fabric.
  • the average of the MD and XD strip tensile strengths of the fabrics are plotted in the Figure and show the extraordinarily higher strip tensile strength of these fabrics of the invention, as compared to the highest strip tensile strength exhibited by same weight of prior art fabrics.
  • the fabrics of this example have strip tensile strengths that are about 7.7 to 9.2 times those of the prior art fabrics of comparable weight.
  • Nomex s aramid staple fibers Two batts of Nomex s aramid staple fibers were prepared by an air-laydown process of the type described in Zafiroglu, U.S. Patent 3,797,074.
  • the Nomex® fibers were available commercially from E.I. du Pont de Nemours and Company and are made from poly(m-phenylene isophthalamide) polymer.
  • Batt 2-a consisted essentially of a 67/33 blend of 1.5 inch [3.8 cm] long and 1/4 inch [0.64 cm] long staple fibers of 2 denier [2.2 dtex].
  • Batt 2-b consisted essentially of 1 inch [2.5 cm] long fibers of 2 denier [2.2 dtex].
  • Batts 2a and 2b were treated with columnar hydraulic jets to form fabrics respectively weighing 7.0 and 8.6 oz/yd 2 [237 and 292 g/m 2 ].
  • Table II summarizes the sequence of jet treatments. The first five rows of jets impact one face of the batt; the other rows, the other face.
  • This example illustrates the production of fabrics of the invention from poly(ethylene terephthalate) staple fibers of 1.35 denier [1.5 dtex] and 3/4 inch [1.9 cm] length.
  • the fabrics exhibit excellent tensile characteristics and resistance to disentanglement.
  • the four fabrics were prepared as described in the following paragraphs.
  • Batt 3-a was prepared on Rando-webber equipment and then treated sequentially by hydraulic jets from orifice set C while being forwarded at 10 yardslmin [9.14 m/min] on screen support C.
  • the batt was treated by seven rows of jets. The first four rows of jets treated one side of the batt and the remaining three rows the other side of the batt.
  • the jet supply pressure was 200 psi [1380 kPa] for the first row of jets and 2800 psi [19290 kPa] for the remaining rows of jets.
  • Batt 3-b was formed by means of an air-laydown apparatus of the type disclosed in Zafiroglu, U.S. Patent 3,797,074 and then, while being forwarded at 10 yardslmin [9.14 m/min], was treated sequentially by seven rows of jets. The first four rows treat one side of the batt; the last three rows treat the other side. While under the first row of jets, the batt is on support screen C; on screen A while under the next three rows; and on screen B while under the last three rows. The first row of jets was supplied through orifice set C at a pressure of 1000 psi [6890] kPa.
  • the next three rows were supplied through orifice sets D respectively at pressures of 500, 1500 and 2000 psi [3450, 10340 and 13780 kPa].
  • the final three rows were supplied through orifice sets D respectively at pressures of 500, 1500 and 2000 psi [3450, 10340 and 13780 kPa].
  • Batts 3-c and 3-d were formed on a similar air laydown apparatus as used for Batt 3-b, but one that gave more MD direction strength to the batt. Batts 3-c and 3-d were subjected to rows of hydraulic jets while being forwarded at 13.6 yards/min [12.4 m/min].
  • Batt 3-c one face of the batt was subjected in sequence to one row of jets supplied through orifice set E at 1500 psi [10340 kPa] while on screen support C, and then while on screen support B, to one row of jets supplied through orifice set C at 500 psi [3450 kPa] and 4 rows of jets supplied through orifice set D at 2000 psi [13780 kPa].
  • staple fibers of polyethylene terephthalate of different deniers and of different lengths are blended together to form batts which are then treated with columnar streams of water to obtain strong, nonapertured, heavy-weight nonwoven fabrics of the present invention.
  • Three batts of blended polyester fibers were prepared by the same air-laydown process as used in Example 2. Two of the batts labelled 4-a and 4-b were made with a 50/50 blend of 1-1/4-inch [3.2 cm] long, 6- denier [6.7-dtex] fibers with 1/4-inch [0.64-cm] long, 1.35-denier [1.5-dtex] fibers. The third batt, 4-c, contained a 67/33 blend respectively of these fibers. These batts were forwarded at 10 yards/min [9.14 m/ min] through columnar water jets, supplied through orifice sets D while supported in sequence on Screens C, A and B.
  • This example illustrates the production of a nonwoven fabric of the invention from a 50/50 blend of 1.5- inch [3.8-cm] long, 15-denier [16.7-dtex] with 1/4-inch [0.63-cm] long, 1.8-den [2-dtex] staple fibers of 66 nylon.
  • the fiber blend was formed into a batt with an air laydown apparatus of the type disclosed in Zafiroglu, U.S. Patent 3,797,074. The batt was then forwarded at 8.0 yards/min [7.3 meters/min] through rows of hydraulic jets, while supported on screens.
  • the sequence of treatments was as follows:

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

Claims (8)

1. Schwerer, nicht mit Öffnungen versehener Vliesstoff, welcher im wesentlichen aus hydraulisch verwirrten Spinnfasern aus synthetischem, organischem Polymeren besteht, dadurch gekennzeichnet, dass der Vliesstoff in Kombination ein Flächengewicht im Bereich von 200 bis 850 g/m2, eine Grabfestigkeit von wenigstens 160 N/cm, eine Streifenzugfestigkeit von wenigstens 0,26 (N/cm)/(g/m2) und eine Entwirrungsbeständigkeit von wenigstens 50 alternierenden Streckzyklen hat.
2. Vliesstoff nach Anspruch 1, dadurch gekennzeichnet, dass das Flächengewicht im Bereich von 240 bis 510 g/m2, die Grabfestigkeit im Bereich von 245 bis 875 N/cm, die Streifenzugfestigkeit im Bereich von 0,36 bis 0,77 (N/cm)/(g/m2) liegt und die Entwirrungsbeständigkeit wenigstens 90 alternierende Streckzyklen umfasst und dass der Vliesstoff zwischen 3 und 10 Strahlspuren pro cm hat.
3. Vliesstoff nach Anspruch 1 oder Anspruch 2, dadurch gekennzeichnet, dass die Spinnfasern 1 bis 18 dtex und eine Länge von 0,6 bis 5 cm haben.
4. Vliesstoff nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das Polymer Poly(p-phenylenterephthalamid) ist.
5. Vliesstoff nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das Polymer Poly(m-phenylenisophthalamid) ist.
6. Vliesstoff nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das Polymer Poly(ethylenterephthalat) ist.
7. Verfahren zum Herstellen eines schweren, nicht mit Öffnungen versehenen Vliesstoffes durch Behandeln von Vliesen aus Spinnfasern aus synthetischem organischem Polymer mit Reihen von feinen, säulenförmigen Wasserströmen während der Abstützung der Vliese auf einem durchlochten Sieb und einer Bewegung senkrecht zu den Reihen der Ströme, dadurch gekennzeichnet, dass für stärkere Gewebe das Gewebe aus Vliesen hergestellt wird, die ein Flächengewicht von 200 bis 850 g/m2 haben und im wesentlichen aus Spinnfasern bestehen, die eine Länge im Bereich von 0,6 bis 5 cm und einen Decitexwert im Bereich von 1 bis 18 haben, die Vliese unmittelbar nach einer vorläufigen Verfestigung und Benetzung mit einer Reihe von Strömen behandelt werden, welche Teile der Spinnfasern von einer Oberfläche des Vlieses durch die Dicke des Vlieses zu der gegenüberliegenden Oberfläche des Vlieses drücken, die Reihe der Ströme in einem Abstand mit einer Wiederholrate im Bereich von 3 bis 10 pro cm vorgesehen sind und über Öffnungen versorgt werden, die Durchmesser im Bereich von 0,13 bis 0,22 mm haben, wodurch man ein Gewebe nach Anspruch 1 herstellt.
8. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass das Flächengewicht im Bereich von 240 bis 510 g/m2 liegt, die Faserlänge im Bereich von 1,3 bis 3,8 cm liegt, der Faserdecitexwert im Bereich von 1,4 bis 2,5 dtex liegt, die Öffnungshäufigkeit im Bereich von 3 bis 6 pro cm liegt und die Ströme unter einem Druck im Bereich von 6890 bis 22 740 kPa eingeleitet werden.
EP84309135A 1984-01-05 1984-12-28 Nichtgewobene Stoffbahnen Expired - Lifetime EP0148033B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US56817184A 1984-01-05 1984-01-05
US568174 1984-01-05
US568171 1984-01-05
US06/568,174 US4556601A (en) 1984-01-05 1984-01-05 Heavy-weight nonwoven fabric of hydraulically-entangled fibers

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EP0148033A2 EP0148033A2 (de) 1985-07-10
EP0148033A3 EP0148033A3 (en) 1987-03-04
EP0148033B1 true EP0148033B1 (de) 1990-09-05

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EP (1) EP0148033B1 (de)
JP (1) JP2595202B2 (de)
KR (1) KR910006427B1 (de)
DE (1) DE3483149D1 (de)
DK (1) DK6685A (de)
IE (1) IE56334B1 (de)

Cited By (1)

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WO2023278929A1 (en) * 2021-06-30 2023-01-05 Dupont Safety & Construction, Inc. Nonwoven liner for cured-in-place pipes

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4536439A (en) * 1985-01-07 1985-08-20 E. I. Du Pont De Nemours And Company Light weight filter felt
FR2705698B1 (fr) * 1993-04-22 1995-06-30 Freudenberg Spunweb Sa Procédé de fabrication d'une nappe de non-tissé constituée de filaments continus liés entre eux et nappe ainsi obtenue.
WO2002050355A1 (en) * 2000-12-19 2002-06-27 M & J Fibretech A/S Web consisting of a base web and air-laid fibres hydroentangled on the base web
FR2856414B1 (fr) * 2003-06-18 2005-09-23 Georgia Pacific France Procede et dispositif d'hydroliage d'une nappe de produit cellulosique fibreux
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Also Published As

Publication number Publication date
EP0148033A3 (en) 1987-03-04
DK6685D0 (da) 1985-01-04
EP0148033A2 (de) 1985-07-10
KR850005519A (ko) 1985-08-26
IE56334B1 (en) 1991-06-19
JP2595202B2 (ja) 1997-04-02
DK6685A (da) 1985-07-06
KR910006427B1 (ko) 1991-08-24
IE850004L (en) 1985-07-05
JPS60155761A (ja) 1985-08-15
DE3483149D1 (de) 1990-10-11

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