EP2041345B1 - Non-woven used as a wiping cloth, its production process and installation for producing it - Google Patents

Non-woven used as a wiping cloth, its production process and installation for producing it Download PDF

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Publication number
EP2041345B1
EP2041345B1 EP07803800A EP07803800A EP2041345B1 EP 2041345 B1 EP2041345 B1 EP 2041345B1 EP 07803800 A EP07803800 A EP 07803800A EP 07803800 A EP07803800 A EP 07803800A EP 2041345 B1 EP2041345 B1 EP 2041345B1
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EP
European Patent Office
Prior art keywords
nonwoven
jets
structures
row
straight line
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EP07803800A
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German (de)
French (fr)
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EP2041345A2 (en
Inventor
Frédéric NOELLE
Said Serbi
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Rieter Perfojet SAS
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Rieter Perfojet SAS
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Priority to PL07803800T priority Critical patent/PL2041345T3/en
Publication of EP2041345A2 publication Critical patent/EP2041345A2/en
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Publication of EP2041345B1 publication Critical patent/EP2041345B1/en
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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/005—Synthetic yarns or filaments
    • D04H3/007—Addition polymers
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L13/00—Implements for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L13/10—Scrubbing; Scouring; Cleaning; Polishing
    • A47L13/16—Cloths; Pads; Sponges
    • 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
    • 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
    • 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
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24273—Structurally defined web or sheet [e.g., overall dimension, etc.] including aperture

Definitions

  • the present invention relates to nonwovens having outstanding electrostatic characteristics, to their methods of manufacture and to their use as dry wiping cloths.
  • nonwovens used as wiping cloths having complex structures for example at least one web of continuous filaments hydroentangled with a sheet of thermoplastic staple fibers.
  • This nonwoven has a high mechanical strength thanks to the properties of the filament layers incorporated.
  • these nonwovens subject to corona discharge have a reduced decline in surface potential over time, which explains their good electrostatic quality and their use as wiping cloth ( EP 1 275 764 ).
  • the invention therefore relates to the use of a polypropylene filament spunbond nonwoven structured with structures of 1 to 3 mm in diameter at a structuring rate indicative of the ratio of the structured surface area to the total area of 20. at 60%, the interval between the structures, defined by the distance between the centers of the structures, being between 3 and 5 mm as wiping cloth.
  • the nonwoven has a tensile strength in a first direction, namely the machine direction, preferably between 100 and 150 N / 50 mm. between 110 and 130 N / 50 mm and in a second direction perpendicular to the first direction, therefore the cross direction, between 80 and 120 N / 50 mm, preferably between 90 and 110 N / 50 mm.
  • the nonwoven has an elongation of 80 to 140% / 10 N.
  • the nonwoven has a surface potential decline between 100 and 150 V in 600 seconds.
  • the filaments preferably have a denier of between 1.8 and 2 and 2.2 and more preferably between 1.9 and 2.1.
  • the nonwoven has a basis weight of 30 to 60 g / m 2 and in particular 40 to 50 g / m 2 .
  • the structures are openings.
  • the invention also relates to an installation comprising a spunbond tower, the bundle of filaments being extruded, stretched and deposited on a conveyor belt, sending a sheet to a consolidation device by jets of water projected on one of the faces of the web to obtain a consolidated web itself sent to a structuring device, including an adjoining device, by jets of water.
  • the structuring device is arranged to project jets on the other side of the consolidated sheet and comprises three rows of jets with a diameter of 100 to 140 ⁇ m, preferably 110 to 130 ⁇ m, the intervals between the outlets of the jets in the same row being between 0.5 and 1.5 mm, the distance between the straight line passing through the centers of the outlets of a row and the line passing through those of a neighboring row being between 0.25 and 1.2 mm and the distance between the perpendicular to said straight line of a row passing through one of its orifices and perpendicular to said straight line of a neighboring row passing through the orifice closest to said orifice is between 0.25 and 0.75 mm.
  • the nonwoven thus obtained is dried in a through air oven and is received on a winding device.
  • the rate of passage of the nonwoven in the installation mainly in front of the adjoining station is between 20 and 60 m per minute, preferably between 20 and 50 m per minute. Too high a speed can prevent getting the openings.
  • the invention finally relates to a nonwoven as defined for the nonwoven used as a dry cleaning cloth according to the invention.
  • the openings are preferably free of filaments passing therethrough.
  • the gaps between the openings are free of loop surface formed of filament.
  • a nonwoven By operating, preferably, by the method and on the installation defined above, a nonwoven is obtained which, unexpectedly, has all the qualities required to constitute a good wiping cloth and which, in particular , has a sufficiently slow surface potential decline, so that it retains its dust and wire collection properties electrostatically for as long as possible, properties that are conferred on it by the simple friction implemented during the wiping operation. Unevenly, the unevenness caused by the openings does not make it difficult for the wiping cloth to pass over the surface to be wiped, especially when the solid parts of the nonwoven have no longer any hooking loops or other hair and the enhancements improve the process of potential decline. In this respect, a perforated cloth is more effective than a plain surface cloth.
  • the invention also relates to a wiping process which consists in wiping a surface with the aid of a nonwoven according to the invention.
  • the wiper according to the invention can be used, in particular, for dry wiping of all surfaces, in particular metal, plastic, ceramic, glass, fabric, as follows:
  • the cloth is held in one hand and applied to the surface to be cleaned with either straight or small circles.
  • the sample is conditioned for 24 hours and the test is carried out at 23 ° C. and a relative humidity of 50%.
  • the thickness of the nonwoven is measured by measuring the distance between a reference plate on which the nonwoven is based and a parallel pressure plate which applies a precise pressure to the surface under test.
  • the apparatus consists of two circular horizontal plates attached to a frame. The top plate moves vertically. It has a surface of about 2500 m 2 .
  • the reference plate has a flat surface with a diameter greater than 50 mm greater than that of the top plate.
  • Equipment is provided for vertically suspending the test piece between the two trays.
  • the test piece has dimensions of 180 x 180 mm plus or minus 5 mm for width and length. There is provided a device for measuring the distance between the plates when they are close to the point of applying a pressure of 0.02 kpa.
  • a sample is conditioned for 24 hours and the test is carried out at 23 ° C. and a relative humidity of 50%.
  • a dynamometer comprising a set of fixed jaws and a set of movable jaws moving at a constant speed is used for the test.
  • the jaws of the dynamometer have a useful width of 50 mm.
  • the dynamometer is equipped with a logger which allows to draw the curve of the tractive force according to elongation.
  • Five samples of 50 mm plus or minus 0.5 mm in width and 250 mm in length are cut, in the long direction and in the cross direction of the nonwoven.
  • the samples are tested one by one, at a constant tensile speed of 100 mm per minute and with an initial distance between jaws of 200 mm.
  • the dynamometer records the curve of the tensile force in Newtons as a function of elongation.
  • a sample is conditioned for 24 hours and the test is carried out at 23 ° C. and a relative humidity of 50%.
  • a dynamometer comprising a set of fixed jaws and a set of movable jaws moving at a constant speed is used for the test.
  • the jaws of the dynamometer have a useful width of 50 mm.
  • the dynamometer is equipped with a logger which allows to draw the curve of the tensile force according to the displacement of the movable jaws.
  • 5 samples of 75 mm plus or minus 1 mm in width and 150 mm plus or minus 2 mm in length are cut in the long direction and in the cross direction of the nonwoven. The long side of 150 mm is cut in the direction of the machine direction or through to be tested.
  • Samples are tested one by one.
  • the jaws of the dynamometer are placed at an initial distance of 25 mm.
  • the sample is placed between the jaws so that the small base of the trapezium slightly tense and the base of the trapezium is relaxed.
  • Samples are tested at a constant pull rate of 100 mm per minute.
  • a sample is conditioned for 24 hours and the test is carried out at 23 ° C. and a relative humidity of 50%.
  • At least 3 samples of an area of at least 50,000 mm 2 are cut with a cutting apparatus known as a cutter.
  • Each sample is weighed on a laboratory scale with an accuracy of 0.1% of the weight of the weighed samples.
  • the decline of the surface potential is measured as follows.
  • Step 1 A DC voltage greater than or equal to ⁇ 3 KV is applied to a needle from a high voltage power supply. This makes it possible to ionize the air in the vicinity of the needle. We talk about corona discharge. For a positive (negative) voltage applied to the needle, positive (negative) ions are generated. We can therefore deposit ions whose polarity is controlled on the surface of an insulating material that is placed under this needle. The amount of ions deposited will then depend on the voltage and the duration of the corona discharge, the distance between the needle and the surface of the material and the climatic conditions (temperature and relative humidity) in which this is achieved. crown discharge.
  • a metal gate connected to a high-voltage power supply is inserted between the needle and the material.
  • the setpoint applied to this fixed grid the amount of ions deposited (e.g., applying a voltage V on the discharge gate, the amount of ions is deposited on the surface gives a voltage equivalent value on the surface of the material equal to V discharge. in other words, the ions generated by corona discharge pass through the grille and are deposited on the surface of the material until the potential on this surface reaches the value of the voltage applied to the gate.
  • the other advantage of this grid is to allow to homogenize the distribution of ions on the surface of the material.
  • Step 2 Once the ions are deposited, they represent an "equivalent" voltage on the surface that we call surface potential.
  • a non-contact electrostatic probe positioned a few mm above the material, makes it possible to measure this surface potential.
  • This electrostatic probe is connected to an electrostatic voltmeter whose analog output is connected to a computer that records the potential value as a function of the time that has elapsed after depositing the ions.
  • the complete system consists of a motorized turntable (stepper motor) with 4 sample holders.
  • the displacement of the sample holder from the discharge station to the measurement station is thus automated and the speed of movement is controlled.
  • the application of the duration and the voltage of the corona discharge is also automated.
  • the whole is driven by a program.
  • the device is installed in an enclosure climate, which makes it possible to perfectly control the desired temperature and relative humidity conditions.
  • the sample holder is grounded, which means that the back of the sample is also in contact with the ground.
  • the figure 1 represents an installation according to the invention. It comprises a conventional spunbond tower 1 providing on a conveyor belt 2 a nonwoven N which passes on two drums 4 and 5 and then on a drum 6 of drying.
  • the outlets of the jets are arranged in two rows in each injector 7 and 8. They are staggered from one row to another.
  • the distance between two orifices of the same row is between 1.2 and 1.6 mm, and preferably between 1.3 and 1.5 mm. We obtain a non-woven face without hair.
  • the figure 2 illustrates the position of the orifices of the water jets on the injector 9. They are in a row at an interval of the same size d3 as in the injectors 7 and 8, and preferably at an identical interval.
  • the distance between two adjacent outlets of the jets of the injector 10 is denoted d1 at the figure 3 .
  • the distance between the perpendiculars to the two straight lines passing through the respective centers of two adjacent rows is denoted by d2 at the figure 3 , the perpendiculars to the two lines passing through two adjacent holes of a row and the other.
  • a first row Ra a second row Rb and a third row Rc of orifices, three of them being represented in each row.
  • the row Ra thus has orifices 11, 12 and 13, the row Rb of the orifices 14, 15 and 16 and the row Rc of the orifices 17, 18, 19. orifices 11, 12, 13 pass through the same straight line, the centers of the orifices 14, 15, 16 pass through another same straight line parallel to the first and the same applies to the orifices 17, 18, 19.
  • the distance between the center of an orifice 11 and that of its neighbor orifice 12 is denoted d1.
  • the distance between the perpendicular to the straight lines of the rows Ra, Rb and Rc passing through the orifice 11 and the perpendicular to these lines passing through the center of the orifice 14 is denoted d2.
  • d1 is between 0.60 and 0.90 mm, while d2 is between 0.15 and 0.35 mm.
  • the diameter of the orifices is between 100 and 140 ⁇ m and, preferably, it is 120 ⁇ m.
  • a sheet of continuous filament PP of 2 deniers is subjected to the action of jets of water on an installation corresponding to the figure 1 , the speed of the jets of water is 50 m / minute, the pressure of the water jets on the injectors 7 and 8 is 100 bar, the pressure of the water jets on the injectors 9 and 10 is 200 bar .
  • the nonwoven obtained is dried at a temperature of 120 ° C. in a through-air oven.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Nonwoven Fabrics (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Cleaning Implements For Floors, Carpets, Furniture, Walls, And The Like (AREA)

Abstract

This non-woven production installation comprises a spunbond tower (1), a device (7, 8) for consolidation by means of jets of water and a device (9, 10) for perforating by means of jets of water, the perforating device comprising three rows of jet outlet orifices.

Description

La présente invention se rapporte aux non-tissés ayant des caractéristiques électrostatiques remarquables, à leurs procédés de fabrication et à leur utilisation en tant que chiffons d'essuyage à sec.The present invention relates to nonwovens having outstanding electrostatic characteristics, to their methods of manufacture and to their use as dry wiping cloths.

Il est connu de réaliser des non-tissés utilisés comme chiffons d'essuyage ayant des structures complexes, par exemple au moins une nappe de filaments continus hydroenchevêtrée à une nappe de fibres discontinues thermoplastiques.It is known to produce nonwovens used as wiping cloths having complex structures, for example at least one web of continuous filaments hydroentangled with a sheet of thermoplastic staple fibers.

Ce non-tissé a une grande résistance mécanique grâce aux propriétés des nappes de filaments incorporées. En plus, ces non-tissés soumis à une décharge couronne ont un déclin réduit du potentiel de surface dans le temps, ce qui explique leur bonne qualité électrostatique et leur utilisation comme chiffon d'essuyage ( EP 1 275 764 ).This nonwoven has a high mechanical strength thanks to the properties of the filament layers incorporated. In addition, these nonwovens subject to corona discharge have a reduced decline in surface potential over time, which explains their good electrostatic quality and their use as wiping cloth ( EP 1 275 764 ).

Or, on a trouvé ce qui fait l'objet de la présente invention, un non-tissé ayant des caractéristiques électrostatiques meilleures, moins coûteux et plus facile à obtenir par un procédé qui lui confère aussi une grande résistance mécanique.However, it has been found that which is the subject of the present invention, a nonwoven having better electrostatic characteristics, less expensive and easier to obtain by a process which also gives it a high mechanical strength.

L'invention a donc pour objet l'utilisation d'un non-tissé spunbond en filaments de polypropylène structuré par des structures de 1 à 3 mm de diamètre à un taux de structuration indiquant le rapport de la surface structurée à la surface totale de 20 à 60 %, l'intervalle entre les structures, défini par la distance entre les centres des structures, étant compris entre 3 et 5 mm comme chiffon d'essuyage.The invention therefore relates to the use of a polypropylene filament spunbond nonwoven structured with structures of 1 to 3 mm in diameter at a structuring rate indicative of the ratio of the structured surface area to the total area of 20. at 60%, the interval between the structures, defined by the distance between the centers of the structures, being between 3 and 5 mm as wiping cloth.

De préférence, le non-tissé a une résistance à la rupture en traction dans un premier sens, à savoir le sens machine, compris entre 100 et 150 N/50 mm, de préférence, entre 110 et 130 N/50 mm et dans un second sens perpendiculaire au premier, donc le sens travers, compris entre 80 et 120 N/50 mm, de préférence, entre 90 et 110 N/50 mm.Preferably, the nonwoven has a tensile strength in a first direction, namely the machine direction, preferably between 100 and 150 N / 50 mm. between 110 and 130 N / 50 mm and in a second direction perpendicular to the first direction, therefore the cross direction, between 80 and 120 N / 50 mm, preferably between 90 and 110 N / 50 mm.

De préférence, le non-tissé a un allongement de 80 à 140 %/10 N.Preferably, the nonwoven has an elongation of 80 to 140% / 10 N.

De préférence, le non-tissé a un déclin de potentiel de surface compris entre 100 et 150 V en 600 secondes.Preferably, the nonwoven has a surface potential decline between 100 and 150 V in 600 seconds.

Les filaments ont, de préférence, un denier compris entre 1,8 et 2 et 2,2 et mieux entre 1,9 et 2,1.The filaments preferably have a denier of between 1.8 and 2 and 2.2 and more preferably between 1.9 and 2.1.

De préférence, le non-tissé a un grammage de 30 à 60 g/m2 et notamment de 40 à 50 g/m2.Preferably, the nonwoven has a basis weight of 30 to 60 g / m 2 and in particular 40 to 50 g / m 2 .

Suivant un mode de réalisation très préféré du non-tissé utilisé, les structures sont des ajours.According to a very preferred embodiment of the nonwoven used, the structures are openings.

Lorsqu'un ajour n'est pas circulaire, on considère que son diamètre est la moyenne de sa plus grande dimension parallèlement à la surface du non-tissé et de sa dimension perpendiculaire à sa plus grande dimension.When an aperture is not circular, it is considered that its diameter is the average of its largest dimension parallel to the surface of the nonwoven and its dimension perpendicular to its largest dimension.

L'invention a également pour objet un procédé de production d'un non-tissé dans lequel :

  • on prépare une nappe spunbond de filaments de polypropylène,
  • on consolide la nappe par hydroliage par action de jets d'eau sur l'une de ses faces à une pression des jets de 80 à 120 bars, de préférence de 90 à 110 bars, en une nappe consolidée,
  • on structure la nappe consolidée par action de jets d'eau sur l'autre face de la nappe à une pression de 180 à 220 bars, de préférence de 190 à 210 bars, provenant d'un injecteur à trois rangées de jets d'un diamètre de 100 à 140 µm, de préférence de 110 à 130 µm, les intervalles entre les orifices de sortie des jets dans une même rangée étant compris entre 0,5 et 1,5 mm, la distance entre la droite passant par les centres des orifices de sortie d'une rangée et la droite passant par ceux d'une rangée voisine étant comprise entre 0,25 et 1,2 mm et la distance entre la perpendiculaire à ladite droite d'une rangée passant par l'un de ses orifices et la perpendiculaire à ladite droite d'une rangée voisine passant par l'orifice le plus proche dudit un orifice est comprise entre 0,25 et 0,75 mm.
The invention also relates to a process for producing a nonwoven fabric in which:
  • a spunbond web of polypropylene filaments is prepared,
  • the web is consolidated by hydrolysis by the action of jets of water on one of its faces at a jet pressure of 80 to 120 bar, preferably 90 to 110 bar, in a consolidated layer,
  • the consolidated sheet is formed by the action of jets of water on the other face of the sheet at a pressure of 180 to 220 bar, preferably 190 to 210 bar, coming from a three-row injector of jets of a diameter of 100 to 140 μm, preferably from 110 to 130 μm, the intervals between the outlets of jets in the same row being between 0.5 and 1.5 mm, the distance between the straight line passing through the centers of outlets from one row and the right going through those of a neighboring row being between 0.25 and 1.2 mm and the distance between the perpendicular to said straight line of a row passing through one of its orifices and the perpendicular to said straight line of a neighboring row passing through by the orifice closest to said one orifice is between 0.25 and 0.75 mm.

L'invention a aussi pour objet une installation comprenant une tour spunbond, le faisceau de filaments étant extrudé, étiré et déposé sur un tapis transporteur, envoyant une nappe à un dispositif de consolidation par jets d'eau projetés sur l'une des faces de la nappe pour obtenir une nappe consolidée lui-même envoyé à un dispositif de structuration, notamment à un dispositif d'ajourage, par jets d'eau. Suivant l'invention, le dispositif de structuration est disposé de manière à projeter des jets sur l'autre face de la nappe consolidée et comprend trois rangées de jets d'un diamètre de 100 à 140 µm, de préférence de 110 à 130 µm, les intervalles entre les orifices de sortie des jets dans une même rangée étant compris entre 0,5 et 1,5 mm, la distance entre la droite passant par les centres des orifices de sortie d'une rangée et la droite passant par ceux d'une rangée voisine étant comprise entre 0,25 et 1,2, mm et la distance entre la perpendiculaire à ladite droite d'une rangée passant par l'un de ses orifices et la perpendiculaire à ladite droite d'une rangée voisine passant par l'orifice le plus proche dudit un orifice est comprise entre 0,25 et 0,75 mm.The invention also relates to an installation comprising a spunbond tower, the bundle of filaments being extruded, stretched and deposited on a conveyor belt, sending a sheet to a consolidation device by jets of water projected on one of the faces of the web to obtain a consolidated web itself sent to a structuring device, including an adjoining device, by jets of water. According to the invention, the structuring device is arranged to project jets on the other side of the consolidated sheet and comprises three rows of jets with a diameter of 100 to 140 μm, preferably 110 to 130 μm, the intervals between the outlets of the jets in the same row being between 0.5 and 1.5 mm, the distance between the straight line passing through the centers of the outlets of a row and the line passing through those of a neighboring row being between 0.25 and 1.2 mm and the distance between the perpendicular to said straight line of a row passing through one of its orifices and perpendicular to said straight line of a neighboring row passing through the orifice closest to said orifice is between 0.25 and 0.75 mm.

Le non-tissé ainsi obtenu est séché dans un four à air traversant puis est réceptionné sur un dispositif d'enroulement.The nonwoven thus obtained is dried in a through air oven and is received on a winding device.

La vitesse de passage du non-tissé dans l'installation principalement devant le poste d'ajourage est comprise entre 20 et 60 m à la minute,en étant de préférence comprise entre 20 et 50 m à la minute. Une vitesse trop grande peut empêcher d'obtenir les ajours.The rate of passage of the nonwoven in the installation mainly in front of the adjoining station is between 20 and 60 m per minute, preferably between 20 and 50 m per minute. Too high a speed can prevent getting the openings.

L'invention a enfin pour objet un non-tissé tel que défini pour le non-tissé utilisé comme chiffon de nettoyage à sec suivant l'invention.The invention finally relates to a nonwoven as defined for the nonwoven used as a dry cleaning cloth according to the invention.

En outre, suivant l'invention, dans le non-tissé, les ajours sont, de préférence, exempts de filaments les traversant.In addition, according to the invention, in the nonwoven, the openings are preferably free of filaments passing therethrough.

Suivant un mode de réalisation lui aussi préféré, les intervalles entre les ajours sont exempts en surface de boucle formée de filament.According to a also preferred embodiment, the gaps between the openings are free of loop surface formed of filament.

En opérant, de préférence, par le procédé et sur l'installation définie ci-dessus, on obtient un non-tissé qui, d'une manière inattendue, a toutes les qualités requises pour constituer un bon chiffon d'essuyage et qui, notamment, a un déclin de potentiel de surface suffisamment lent, de sorte qu'il conserve ses propriétés de collecte des poussières et des fils par voie électrostatique aussi longtemps que possible, propriétés qui lui sont conférées par le simple frottement mis en oeuvre lors de l'opération d'essuyage. D'une manière inattendue, les dénivellations provoquées par les ajours ne rendent pas difficile le passage du chiffon d'essuyage sur la surface à essuyer surtout lorsque les parties pleines du non-tissé ne présentent plus de boucles d'accrochage ou autre pilosité et les ajours améliorent le procédé de déclin de potentiel. Un chiffon troué est à cet égard plus efficace qu'un chiffon à surface unie. L'invention vise aussi un procédé d'essuyage qui consiste à essuyer une surface à l'aide d'un non-tissé suivant l'invention.By operating, preferably, by the method and on the installation defined above, a nonwoven is obtained which, unexpectedly, has all the qualities required to constitute a good wiping cloth and which, in particular , has a sufficiently slow surface potential decline, so that it retains its dust and wire collection properties electrostatically for as long as possible, properties that are conferred on it by the simple friction implemented during the wiping operation. Unevenly, the unevenness caused by the openings does not make it difficult for the wiping cloth to pass over the surface to be wiped, especially when the solid parts of the nonwoven have no longer any hooking loops or other hair and the enhancements improve the process of potential decline. In this respect, a perforated cloth is more effective than a plain surface cloth. The invention also relates to a wiping process which consists in wiping a surface with the aid of a nonwoven according to the invention.

Le chiffon d'essuyage suivant l'invention peut être utilisé, notamment, pour l'essuyage à sec de toutes surfaces, notamment en métal, en matière plastique, en céramique, en verre, en tissu, de la manière suivante :The wiper according to the invention can be used, in particular, for dry wiping of all surfaces, in particular metal, plastic, ceramic, glass, fabric, as follows:

Le chiffon est tenu d'une main et appliqué sur la surface à nettoyer avec un déplacement soit rectiligne soit par petits cercles.The cloth is held in one hand and applied to the surface to be cleaned with either straight or small circles.

Les tests de laboratoire de mesure d'épaisseur, de masse volumique, de résistance dans le sens long et dans le sens travers, d'allongement dans le sens long et dans le sens travers, de déchirure sens long et sens travers sont conduits selon les normes ERT de l'EDANA (European Disposables and Nonwovens Association), à savoir :Laboratory tests for measuring thickness, density, long-term and cross-directional strength, elongation in the long and cross direction, long-term and cross-direction tearing are conducted according to EDANA (European Disposables and Nonwovens Association) ERT standards, namely:

a) Epaisseur a) Thickness

On conditionne l'échantillon pendant 24 heures et on effectue l'essai à 23°C et à une humidité relative de 50 %. On mesure l'épaisseur du non-tissé en mesurant la distance entre un plateau de référence sur lequel repose le non-tissé et un plateau presseur parallèle qui applique une pression précise sur la surface soumise à l'essai. L'appareil consiste en deux plaques horizontales circulaires fixées à un bâti. La plaque supérieure se déplace verticalement. Elle a une surface d'environ 2500 m2. La plaque de référence a une surface plane d'un diamètre plus grand d'au moins 50 mm que celui de la plaque supérieure. Il est prévu un équipement permettant de suspendre verticalement la pièce soumise à l'essai entre les deux plateaux.The sample is conditioned for 24 hours and the test is carried out at 23 ° C. and a relative humidity of 50%. The thickness of the nonwoven is measured by measuring the distance between a reference plate on which the nonwoven is based and a parallel pressure plate which applies a precise pressure to the surface under test. The apparatus consists of two circular horizontal plates attached to a frame. The top plate moves vertically. It has a surface of about 2500 m 2 . The reference plate has a flat surface with a diameter greater than 50 mm greater than that of the top plate. Equipment is provided for vertically suspending the test piece between the two trays.

La pièce d'essai a des dimensions de 180 x 180 mm a plus ou moins 5 mm pour la largeur et la longueur. Il est prévu un dispositif de mesure de la distance entre les plaques lorsque celles-ci se sont rapprochées au point d'appliquer une pression de 0,02 kpa.The test piece has dimensions of 180 x 180 mm plus or minus 5 mm for width and length. There is provided a device for measuring the distance between the plates when they are close to the point of applying a pressure of 0.02 kpa.

b) Résistance et allongement dans le sens long et dans le sens travers b) Resistance and elongation in the long direction and in the cross direction

On conditionne un échantillon pendant 24 heures et on effectue l'essai à 23°C et à une humidité relative de 50 %. On utilise pour le test un dynamomètre comprenant un jeu de mâchoires fixes et un jeu de mâchoires mobiles se déplaçant à une vitesse constante. Les mâchoires du dynamomètre ont une largeur utile de 50 mm. Le dynamomètre est équipé d'un enregistreur qui permet de tracer la courbe de la force de traction en fonction de l'allongement. On coupe 5 échantillons de 50 mm plus ou moins 0,5 mm de largeur et de 250 mm de longueur, ceci dans le sens long et dans le sens travers du non-tissé. Les échantillons sont testés un par un, à une vitesse constante de traction de 100 mm par minute et avec une distance initiale entre mâchoires de 200 mm. Le dynamomètre enregistre la courbe de la force de traction en newtons en fonction de l'allongement.A sample is conditioned for 24 hours and the test is carried out at 23 ° C. and a relative humidity of 50%. A dynamometer comprising a set of fixed jaws and a set of movable jaws moving at a constant speed is used for the test. The jaws of the dynamometer have a useful width of 50 mm. The dynamometer is equipped with a logger which allows to draw the curve of the tractive force according to elongation. Five samples of 50 mm plus or minus 0.5 mm in width and 250 mm in length are cut, in the long direction and in the cross direction of the nonwoven. The samples are tested one by one, at a constant tensile speed of 100 mm per minute and with an initial distance between jaws of 200 mm. The dynamometer records the curve of the tensile force in Newtons as a function of elongation.

c) Résistance à la déchirure dans le sens long et dans le sens travers c) Tear resistance in the long direction and in the cross direction

On conditionne un échantillon pendant 24 heures et on effectue l'essai à 23°C et à une humidité relative de 50 %.A sample is conditioned for 24 hours and the test is carried out at 23 ° C. and a relative humidity of 50%.

On utilise pour le test un dynamomètre comprenant un jeu de mâchoires fixes et un jeu de mâchoires mobiles se déplaçant à une vitesse constante. Les mâchoires du dynamomètre ont une largeur utile de 50 mm. Le dynamomètre est équipé d'un enregistreur qui permet de tracer la courbe de la force de traction en fonction du déplacement des mâchoires mobiles. On coupe 5 échantillons de 75 mm plus ou moins 1 mm de largeur et de 150 mm plus ou moins 2 mm de longueur, ceci dans le sens long et dans le sens travers du non-tissé. Le grand côté de 150 mm est coupé dans le sens de la direction machine ou travers à tester. On trace deux lignes obliques définissant un trapèze isocèle de 25 mm de base par 100 mm de base et de 75 mm de hauteur et dont les bases sont centrées à 75 mm des bords des éprouvettes. Une petite entaille de 5 mm est réalisée à l'aide de ciseaux au centre de la base de 25 mm de chaque trapèze. Cette entaille a pour but d'amorcer la déchirure lors des tests.A dynamometer comprising a set of fixed jaws and a set of movable jaws moving at a constant speed is used for the test. The jaws of the dynamometer have a useful width of 50 mm. The dynamometer is equipped with a logger which allows to draw the curve of the tensile force according to the displacement of the movable jaws. 5 samples of 75 mm plus or minus 1 mm in width and 150 mm plus or minus 2 mm in length are cut in the long direction and in the cross direction of the nonwoven. The long side of 150 mm is cut in the direction of the machine direction or through to be tested. We draw two oblique lines defining an isosceles trapezium of 25 mm base by 100 mm base and 75 mm height and whose bases are centered 75 mm from the edges of the test pieces. A small cut of 5 mm is made using scissors in the center of the base of 25 mm of each trapeze. This notch is intended to initiate the tear during testing.

Les échantillons sont testés un par un. Les mâchoires du dynamomètre sont placées à une distance initiale de 25 mm. L'échantillon est placé entre les mâchoires de manière à ce que la petite base du trapèze soit légèrement tendue et que la brande base du trapèze soit détendue.Samples are tested one by one. The jaws of the dynamometer are placed at an initial distance of 25 mm. The sample is placed between the jaws so that the small base of the trapezium slightly tense and the base of the trapezium is relaxed.

Les échantillons sont testés à une vitesse constante de traction de 100 mm par minute.Samples are tested at a constant pull rate of 100 mm per minute.

d) Masse au mètre carré d) Mass per square meter

On conditionne un échantillon pendant 24 heures et on effectue l'essai à 23°C et à une humidité relative de 50 %.A sample is conditioned for 24 hours and the test is carried out at 23 ° C. and a relative humidity of 50%.

On coupe au oins 3 échantillons d'une surface d'au moins 50.000 mm2 avec un appareil de découpe appelé massicot.At least 3 samples of an area of at least 50,000 mm 2 are cut with a cutting apparatus known as a cutter.

Chaque échantillon est pesé sur une balance de laboratoire ayant une précision de 0,1 % de la masse des échantillons pesés.Each sample is weighed on a laboratory scale with an accuracy of 0.1% of the weight of the weighed samples.

e) Déclin du potentiel de surface e) Decline of surface potential

On mesure le déclin du potentiel de surface de la manière suivante.The decline of the surface potential is measured as follows.

La mesure du déclin de potentiel de surface (DPS) s'effectue en deux étapes :

  1. a) dépôt d'ions (positifs ou négatifs) sur la surface du matériau,
  2. b) mesure du potentiel à la surface du matériau et enregistrement de ce potentiel au cours du temps.
The measurement of the surface potential decline (DPS) is done in two steps:
  1. a) deposition of ions (positive or negative) on the surface of the material,
  2. b) measuring the potential at the surface of the material and recording this potential over time.

Etape 1 : Une tension continue supérieure ou égale à ±3 KV est appliquée sur une aiguille à partir d'une alimentation haute tension. Ceci permet d'ioniser l'air au voisinage de l'aiguille. On parle de décharge couronne. Pour une tension positive (négative) appliquée sur l'aiguille, des ions positifs (négatifs) sont générés. On peut donc déposer des ions dont on contrôle la polarité sur la surface d'un matériau isolant que l'on place sous cette aiguille. La quantité d'ions déposée va alors dépendre de la tension et de la durée de la décharge couronne, de la distance entre l'aiguille et la surface du matériau et les conditions climatiques (température et humidité relative) dans lesquelles est réalisée cette décharge couronne. Afin de contrôler cette quantité d'ions déposée, on intercale entre l'aiguille et le matériau une grille métallique connectée à une alimentation haute tension. La consigne appliquée sur cette grille fixe la quantité d'ions déposés (par exemple, si on applique une tension Vdécharge sur la grille, la quantité d'ions qui se dépose sur la surface donne une valeur équivalente de tension sur la surface du matériau égale à Vdécharge. Dit autrement, les ions générés par décharge couronne traversent la grille et vont se déposer sur la surface du matériau jusqu'à ce que le potentiel sur cette surface atteigne la valeur de la tension appliquée sur la grille. L'autre avantage de cette grille est de permettre d'homogénéiser la répartition des ions sur la surface du matériau. Step 1 : A DC voltage greater than or equal to ± 3 KV is applied to a needle from a high voltage power supply. This makes it possible to ionize the air in the vicinity of the needle. We talk about corona discharge. For a positive (negative) voltage applied to the needle, positive (negative) ions are generated. We can therefore deposit ions whose polarity is controlled on the surface of an insulating material that is placed under this needle. The amount of ions deposited will then depend on the voltage and the duration of the corona discharge, the distance between the needle and the surface of the material and the climatic conditions (temperature and relative humidity) in which this is achieved. crown discharge. In order to control this amount of deposited ions, a metal gate connected to a high-voltage power supply is inserted between the needle and the material. The setpoint applied to this fixed grid the amount of ions deposited (e.g., applying a voltage V on the discharge gate, the amount of ions is deposited on the surface gives a voltage equivalent value on the surface of the material equal to V discharge. in other words, the ions generated by corona discharge pass through the grille and are deposited on the surface of the material until the potential on this surface reaches the value of the voltage applied to the gate. the other advantage of this grid is to allow to homogenize the distribution of ions on the surface of the material.

Etape 2 : Une fois les ions déposés, ils représentent une tension "équivalente" en surface que l'on appelle potentiel de surface. Une sonde électrostatique sans contact, positionnée quelques mm au-dessus du matériau permet de mesurer ce potentiel de surface. Cette sonde électrostatique est connectée à un voltmètre électrostatique dont la sortie analogique est connectée à un ordinateur qui enregistre la valeur du potentiel en fonction du temps qui s'est écoulé après avoir déposé les ions. On peut donc suivre l'écoulement des ions sur la surface à partir de l'évolution de ce potentiel de surface : on parle de mesure de déclin de potentiel de surface. La mesure est moyennée sur une surface d'au moins 25 mm2. Step 2 : Once the ions are deposited, they represent an "equivalent" voltage on the surface that we call surface potential. A non-contact electrostatic probe, positioned a few mm above the material, makes it possible to measure this surface potential. This electrostatic probe is connected to an electrostatic voltmeter whose analog output is connected to a computer that records the potential value as a function of the time that has elapsed after depositing the ions. We can therefore follow the flow of ions on the surface from the evolution of this surface potential: we speak of measurement of surface potential decline. The measurement is averaged over an area of at least 25 mm 2 .

Le système complet est composé d'un plateau tournant motorisé (moteur pas à pas) comportant 4 porte-échantillons. Le déplacement du porte-échantillon du poste de décharge au poste de mesure est ainsi automatisé et la vitesse de déplacement est contrôlée. L'application de la durée et de la tension de la décharge couronne est également automatisée. L'ensemble est piloté par un programme. Le dispositif est installé dans une enceinte climatique, ce qui permet de contrôler parfaitement les conditions de température et d'humidité relative souhaitées.The complete system consists of a motorized turntable (stepper motor) with 4 sample holders. The displacement of the sample holder from the discharge station to the measurement station is thus automated and the speed of movement is controlled. The application of the duration and the voltage of the corona discharge is also automated. The whole is driven by a program. The device is installed in an enclosure climate, which makes it possible to perfectly control the desired temperature and relative humidity conditions.

Le porte-échantillon est mis à la masse, ce qui signifie que la face arrière de l'échantillon est elle aussi en contact avec la masse.The sample holder is grounded, which means that the back of the sample is also in contact with the ground.

Conditions expérimentalesExperimental conditions

Les conditions expérimentales appliquées pour tous les échantillons sont résumées dans le tableau suivant : Paramètre Valeur Tension appliquée sur l'aiguille pour réaliser la décharge couronne 5 KV Durée de la tension pour réaliser la décharge couronne 1 seconde Tension appliquée sur la grille répartitrice (Vdécharge) 2000 V Temps "perdu" entre la décharge couronne et la mesure du potentiel ~2secondes Température dans l'enceinte 25°C Humidité relative dans l'enceinte 50 % Temps de conditionnement d'un échantillon dans l'enceinte avant d'effectuer la décharge couronne 30 minutes Durée de la mesure du potentiel de surface consécutive à une décharge couronne 10 minutes The experimental conditions applied for all samples are summarized in the following table: Parameter Value Voltage applied on the needle to achieve the corona discharge 5 KV Duration of the voltage to achieve the corona discharge 1 second Voltage applied on the distribution grid (V discharge ) 2000 V Time "lost" between the corona discharge and the potential measurement ~ 2 seconds Temperature in the enclosure 25 ° C Relative humidity in the enclosure 50% Conditioning time of a sample in the chamber before performing corona discharge 30 minutes Duration of the measurement of the surface potential following a corona discharge 10 minutes

Aux dessins annexés donnés uniquement à titre d'exemple :

  • la figure 1 est une vue schématique en coupe d'une installation suivant l'invention,
  • la figure 2 est un schéma illustrant la position respective des orifices de sortie de jets du premier injecteur d'ajourage (9),
  • la figure 3 est un schéma identique à celui de la figure 2 se rapportant au deuxième injecteur d'ajourage en aval du premier (10),
  • la figure 4 est une vue en plan d'un non-tissé ajouré suivant l'invention.
  • La figure 5 est la courbe de déclin du potentiel de surface du non-tissé suivant l'exemple.
In the accompanying drawings given solely by way of example:
  • the figure 1 is a schematic sectional view of an installation according to the invention,
  • the figure 2 is a diagram illustrating the respective position of the jet outlet orifices of the first perforation injector (9),
  • the figure 3 is a pattern identical to that of the figure 2 relating to the second injoining injector downstream of the first (10),
  • the figure 4 is a plan view of a perforated nonwoven according to the invention.
  • The figure 5 is the curve of decline of the surface potential of the nonwoven according to the example.

La figure 1 représente une installation suivant l'invention. Elle comprend une tour 1 spunbond classique fournissant sur un tapis 2 transporteur un non-tissé N qui passe, sur deux tambours 4 et 5 puis sur un tambour 6 de séchage.The figure 1 represents an installation according to the invention. It comprises a conventional spunbond tower 1 providing on a conveyor belt 2 a nonwoven N which passes on two drums 4 and 5 and then on a drum 6 of drying.

Sur le tambour 4 est effectuée, successivement, sur une face du non-tissé N, par deux injecteurs 7 et 8, une opération habituelle préconsolidation et de consolidation par projection de jets d'eau.On the drum 4 is carried out, successively, on one side of the nonwoven N, by two injectors 7 and 8, a usual operation preconsolidation and consolidation by jetting water jets.

Les orifices de sortie des jets sont disposés sur deux rangées dans chaque injecteur 7 et 8. Ils sont en quinconce d'une rangée à l'autre. La distance entre deux orifices d'une même rangée est comprise entre 1,2 et 1,6 mm, et, de préférence, entre 1,3 et 1,5 mm. On obtient une face du non-tissé sans pilosité.The outlets of the jets are arranged in two rows in each injector 7 and 8. They are staggered from one row to another. The distance between two orifices of the same row is between 1.2 and 1.6 mm, and preferably between 1.3 and 1.5 mm. We obtain a non-woven face without hair.

Une opération d'ajourage est effectuée sur l'autre face du non-tissé sur le tambour 5 à l'aide des injecteurs respectifs 9 et 10. L'autre face n'a plus non plus de pilosité.An operation is performed on the other side of the nonwoven on the drum 5 with the respective injectors 9 and 10. The other side no longer has hairiness.

La figure 2 illustre la position des orifices des jets d'eau sur l'injecteur 9. Ils sont sur une rangée à un intervalle de même grandeur d3 que dans les injecteurs 7 et 8, et, de préférence, à un intervalle identique.The figure 2 illustrates the position of the orifices of the water jets on the injector 9. They are in a row at an interval of the same size d3 as in the injectors 7 and 8, and preferably at an identical interval.

La distance entre deux orifices voisins de sortie des jets de l'injecteur 10 est notée d1 à la figure 3. La distance entre les perpendiculaires aux deux droites passant par les centres respectifs de deux rangées voisines est notée par d2 à la figure 3, les perpendiculaires aux deux droites passant par deux trous voisins d'une rangée et de l'autre.The distance between two adjacent outlets of the jets of the injector 10 is denoted d1 at the figure 3 . The distance between the perpendiculars to the two straight lines passing through the respective centers of two adjacent rows is denoted by d2 at the figure 3 , the perpendiculars to the two lines passing through two adjacent holes of a row and the other.

Plus précisément, il y a trois rangées, à savoir une première rangée Ra, une deuxième rangée Rb et une troisième rangée Rc d'orifices, trois d'entre eux étant représentés dans chaque rangée. La rangée Ra a ainsi des orifices 11, 12 et 13, la rangée Rb des orifices 14, 15 et 16 et la rangée Rc des orifices 17, 18, 19. Les centres des orifices 11, 12, 13 passent par une même droite, les centres des orifices 14, 15, 16 passent par une autre même droite parallèle à la première et il en va de même pour les orifices 17, 18, 19. La distance entre le centre d'un orifice 11 et celui de son orifice 12 voisin est notée d1. La distance entre la perpendiculaire aux droites des rangées Ra, Rb et Rc passant par l'orifice 11 et la perpendiculaire à ces mêmes droites passant par le centre de l'orifice 14 est notée d2.More precisely, there are three rows, namely a first row Ra, a second row Rb and a third row Rc of orifices, three of them being represented in each row. The row Ra thus has orifices 11, 12 and 13, the row Rb of the orifices 14, 15 and 16 and the row Rc of the orifices 17, 18, 19. orifices 11, 12, 13 pass through the same straight line, the centers of the orifices 14, 15, 16 pass through another same straight line parallel to the first and the same applies to the orifices 17, 18, 19. The distance between the center of an orifice 11 and that of its neighbor orifice 12 is denoted d1. The distance between the perpendicular to the straight lines of the rows Ra, Rb and Rc passing through the orifice 11 and the perpendicular to these lines passing through the center of the orifice 14 is denoted d2.

De préférence, d1 est compris entre 0,60 et 0,90 mm, tandis que d2 est compris entre 0,15 et 0,35 mm.Preferably, d1 is between 0.60 and 0.90 mm, while d2 is between 0.15 and 0.35 mm.

Le diamètre des orifices est compris entre 100 et 140 µm et, de préférence, il est de 120 µm.The diameter of the orifices is between 100 and 140 μm and, preferably, it is 120 μm.

Grâce à cette disposition des orifices de sortie de jets, on peut empêcher qu'il se produise un point d'accrochage du non-tissé, qui peut être désagréable à l'utilisateur.With this arrangement of jet outlets, it can prevent it occurs a point of attachment of the nonwoven, which can be unpleasant to the user.

L'exemple suivant illustre l'invention.The following example illustrates the invention.

Une nappe de filament continu PP de 2 deniers est soumis à l'action de jets d'eau sur une installation correspondant à la figure 1, la vitesse des jets d'eau est de 50 m/minute, la pression des jets d'eau sur les injecteurs 7 et 8 est de 100 bars, la pression des jets d'eau sur les injecteurs 9 et 10 est de 200 bars.A sheet of continuous filament PP of 2 deniers is subjected to the action of jets of water on an installation corresponding to the figure 1 , the speed of the jets of water is 50 m / minute, the pressure of the water jets on the injectors 7 and 8 is 100 bar, the pressure of the water jets on the injectors 9 and 10 is 200 bar .

Le non-tissé obtenu est séché à une température de 120° C dans un four à l'air traversant. On obtient une masse surfacique de 50 g/m2 avec des ajours de diamètre de 2 mm, avec un taux d'ajour de 5.0 %, la résistance à la traction à la rupture dans le sens machine MD = 140 N et CD = 105 N, l'épaisseur est de 0,8 mm, le non-tissé est très doux et a un déclin de potentiel de 140 V/ en 600 s.The nonwoven obtained is dried at a temperature of 120 ° C. in a through-air oven. A surface density of 50 g / m 2 with openings with a diameter of 2 mm is obtained, with an aperture rate of 5.0%, the tensile strength at break in the machine direction MD = 140 N and CD = 105 N. , the thickness is 0.8 mm, the nonwoven is very soft and has a potential decline of 140 V / in 600 s.

Claims (13)

  1. Use of a spunbond nonwoven made of polypropylene filaments and structured by means of structures having a diameter of from 1 to 3 mm with a degree of structuring such that the ratio of the structured surface to the total surface is from 20 to 60%, the spacing between the structures, which is defined by the distance between the centres of the structures, being from 3 to 5 mm, the nonwoven having a tensile strength in a first direction of from 100 to 150 N/50 mm and in a second direction, perpendicular to the first, of from 80 to 120 N/50 mm, as a dry wiping cloth.
  2. Method of dry cleaning a surface, characterised in that the surface is wiped with a spunbond nonwoven made of polypropylene filaments and structured by means of structures having a diameter of from 1 to 3 mm with a degree of structuring such that the ratio of the structured surface to the total surface is from 20 to 60%, the spacing between the structures, which is defined by the distance between the centres of the structures, being from 3 to 5 mm, the nonwoven having a tensile strength in a first direction of from 100 to 150 N/50 mm and in a second direction, perpendicular to the first, of from 80 to 120 N/50 mm, as a dry wiping cloth.
  3. Use or method according to claim 1 or 2, characterised in that the nonwoven has a tensile strength in a first direction of from 100 to 150 N/50 mm and in a second direction, perpendicular to the first, of from 80 to 120 N/50 mm.
  4. Use or method according to claim 1 or 2, characterised in that the filaments have a denier of from 1.8 to 2.2.
  5. Use or method according to any one of the preceding claims, characterised in that the structures are perforations.
  6. Use or method according to any one of the preceding claims, characterised in that the nonwoven has an elongation of from 80 to 140%/10 N.
  7. Use or method according to any one of the preceding claims, characterised in that the nonwoven has a decline in surface tension of from 100 to 150 V in 600 seconds.
  8. Use or method according to any one of the preceding claims, in which a metal, plastics, ceramics, glass or fabric surface is wiped.
  9. Process for the production of a nonwoven, in which
    - a spunbond web of polypropylene filaments is prepared,
    - the web is consolidated by hydraulic bonding by the action of water jets on one of its faces at a pressure of the jets of from 80 to 120 bar, preferably from 90 to 110 bar, to give a consolidated web,
    characterised in that
    - the consolidated web is structured by the action of water jets on the other face of the web at a pressure of from 180 to 220 bar, preferably from 190 to 210 bar, said jets coming from an injector having three rows of jets with a diameter of from 100 to 140 µm, preferably from 110 to 130 µm, the spacing between the outlet orifices of the jets in the same row being from 0.5 mm to 1.5 mm, the distance between the straight line passing through the centres of the outlet orifices of one row and the straight line passing through those of an adjacent row being from 0.25 to 1.2 mm, the distance between the perpendicular to said straight line of a row passing through one of its orifices and the perpendicular to said straight line of an adjacent row passing through the orifice closest to said one orifice is from 0.25 to 0.75 mm.
  10. Installation for the production of a nonwoven, comprising:
    - a spunbond tower (1) which sends a web to a device (7, 8, 9) for consolidation by means of water jets projected onto one of the faces of the web in order to obtain a consolidated web which is sent to a device (9, 10) for structuring, especially to a device for perforating, by means of water jets, characterised in that the structuring device is arranged so as to project jets onto the other face of the consolidated web and comprises three rows of jets with a diameter of from 100 to 140 µm, preferably from 110 to 130 µm, the spacing between the outlet orifices of the jets in the same row being from 0.5 to 1.5 mm, the distance between the straight line passing through the centres of the outlet orifices of one row and the straight line passing through those of an adjacent row being from 0.25 to 1.2 mm, and the distance between the perpendicular to said straight line of a row passing through one of its orifices and the perpendicular to said straight line of an adjacent row passing through the orifice closest to said one orifice is from 0.25 to 0.75 mm.
  11. Nonwoven made of polypropylene filaments and structured by means of structures, preferably by means of perforations, having a diameter of from 1 to 3 mm with a degree of structuring such that the ratio of the structured surface to the total surface is from 20 to 60%, the spacing between the structures, which is defined by the distance between the centres of the structures, being from 3 to 5 mm, the nonwoven having a tensile strength in a first direction of from 100 to 150 N/50 mm and in a second direction, perpendicular to the first, of from 80 to 120 N/50 mm and a grammage of from 30 to 60 g per m2, the decline in surface tension being from 100 to 150 V.
  12. Nonwoven according to claim 11, characterised in that the perforations are free of filaments passing through them.
  13. Nonwoven according to claims 11 and 12, characterised in that the areas between the perforations are free of loops formed by filaments on their surface.
EP07803800A 2006-07-07 2007-06-28 Non-woven used as a wiping cloth, its production process and installation for producing it Active EP2041345B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL07803800T PL2041345T3 (en) 2006-07-07 2007-06-28 Non-woven used as a wiping cloth, its production process and installation for producing it

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0606213A FR2903426B1 (en) 2006-07-07 2006-07-07 NON-WOVEN AS A WIPING CLOTH, PROCESS AND PRODUCTION PLANT THEREFOR.
PCT/FR2007/001091 WO2008003847A2 (en) 2006-07-07 2007-06-28 Non-woven used as a wiping cloth, its production process and installation for producing it

Publications (2)

Publication Number Publication Date
EP2041345A2 EP2041345A2 (en) 2009-04-01
EP2041345B1 true EP2041345B1 (en) 2010-01-27

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EP07803800A Active EP2041345B1 (en) 2006-07-07 2007-06-28 Non-woven used as a wiping cloth, its production process and installation for producing it

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US (1) US20090320878A1 (en)
EP (1) EP2041345B1 (en)
CN (1) CN101490327B (en)
AT (1) ATE456694T1 (en)
DE (1) DE602007004617D1 (en)
ES (1) ES2336853T3 (en)
FR (1) FR2903426B1 (en)
PL (1) PL2041345T3 (en)
WO (1) WO2008003847A2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2410317A1 (en) * 2010-07-13 2012-01-25 Krämer AG Bassersdorf Method for assessing particles attached to a body
CN102061571B (en) * 2010-12-17 2012-09-26 多氟多化工股份有限公司 Electrostatic spinning and spunlacing consolidation composite membrane-making device
JP5712195B2 (en) * 2012-12-04 2015-05-07 花王株式会社 Nonwoven fabric substrate for wipe sheet
JP5712194B2 (en) * 2012-12-04 2015-05-07 花王株式会社 Nonwoven fabric substrate for wipe sheet

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0737702B2 (en) * 1986-12-31 1995-04-26 ユニ・チヤ−ム株式会社 Non-woven fabric with perforated pattern
US6573205B1 (en) * 1999-01-30 2003-06-03 Kimberly-Clark Worldwide, Inc. Stable electret polymeric articles
JP3662455B2 (en) * 1999-11-22 2005-06-22 ユニ・チャーム株式会社 Polypropylene nonwoven fabric and method for producing the same
US6736916B2 (en) * 2000-12-20 2004-05-18 Kimberly-Clark Worldwide, Inc. Hydraulically arranged nonwoven webs and method of making same
US6420024B1 (en) * 2000-12-21 2002-07-16 3M Innovative Properties Company Charged microfibers, microfibrillated articles and use thereof
FR2827313B1 (en) * 2001-07-10 2004-03-12 Rieter Perfojet NONWOVEN COMPRISING A CONTINUOUS FILAMENT TABLECLOTH, MANUFACTURING METHOD THEREOF AND APPLICATION THEREOF AS WIPING RAG
WO2003060215A1 (en) * 2002-01-09 2003-07-24 Polymer Group Inc. Hydroentangled continuous filament nonwoven fabric and the articles thereof
US20040010894A1 (en) * 2002-07-17 2004-01-22 Avgol Ltd. Method for making a hydroentangled nonwoven fabric and the fabric made thereby
US20040121121A1 (en) * 2002-12-23 2004-06-24 Kimberly -Clark Worldwide, Inc. Entangled fabrics containing an apertured nonwoven web

Also Published As

Publication number Publication date
PL2041345T3 (en) 2010-07-30
WO2008003847A3 (en) 2008-02-21
DE602007004617D1 (en) 2010-03-18
CN101490327B (en) 2011-05-11
ATE456694T1 (en) 2010-02-15
CN101490327A (en) 2009-07-22
EP2041345A2 (en) 2009-04-01
WO2008003847A2 (en) 2008-01-10
FR2903426B1 (en) 2008-09-12
FR2903426A1 (en) 2008-01-11
US20090320878A1 (en) 2009-12-31
ES2336853T3 (en) 2010-04-16

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