EP2337882B1 - Spinnvliesturm mit elektrostatischer vorrichtung - Google Patents

Spinnvliesturm mit elektrostatischer vorrichtung Download PDF

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Publication number
EP2337882B1
EP2337882B1 EP09736251A EP09736251A EP2337882B1 EP 2337882 B1 EP2337882 B1 EP 2337882B1 EP 09736251 A EP09736251 A EP 09736251A EP 09736251 A EP09736251 A EP 09736251A EP 2337882 B1 EP2337882 B1 EP 2337882B1
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EP
European Patent Office
Prior art keywords
air
filaments
air inlet
cooling
forming
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP09736251A
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English (en)
French (fr)
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EP2337882A2 (de
Inventor
Jean-Michel Dubus
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Andritz Perfojet SAS
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Andritz Perfojet SAS
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Application filed by Andritz Perfojet SAS filed Critical Andritz Perfojet SAS
Publication of EP2337882A2 publication Critical patent/EP2337882A2/de
Application granted granted Critical
Publication of EP2337882B1 publication Critical patent/EP2337882B1/de
Not-in-force legal-status Critical Current
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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/08—Melt spinning methods
    • D01D5/098—Melt spinning methods with simultaneous stretching
    • D01D5/0985—Melt spinning methods with simultaneous stretching by means of a flowing gas (e.g. melt-blowing)
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/16—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic filaments produced in association with filament formation, e.g. immediately following extrusion

Definitions

  • the present invention relates to spunbond towers having an electrostatic device for unbundling bundles of filaments.
  • the electrostatic device operates on the principle of the Corona effect which causes ionization of the air near a tip subjected to an electric potential.
  • the small size of the electrode causes a concentration of the field lines which can then exceed the ionization threshold and cause ionization of the air.
  • the Corona effect is positive or negative and causes a different ionization of the air Figure 6 .
  • the filaments are preferentially charged with the same polarity.
  • the material constituting the filament is of electropositive or electronegative nature and therefore tends to more easily accept the charges of the polarity corresponding to its electrostatic affinity. By this load, the filaments will tend to repel each other and thus occupy more evenly the volume of air available.
  • the important parameters of the device are the voltage applied between the electrodes, generally a few tens of kilovolts, from 10 to 70 kilovolts) and the current which is established (by displacement of the ions) between these same elements (a few tens of milliampere per meter of length, from 2 to 20 mA per meter of length).
  • the current obtained is the image of the quantity of the charges that pass between the electrodes.
  • the increase in current indicates an increase in the amount of charges present in the volume between the electrodes and consequently an increase in the probability of depositing charges on the filaments and modifying their trajectory.
  • This electrostatic device disperses the bundles of filaments that are generated by the equipment located upstream. These groupings are usually caused by turbulence or local heterogeneities of air flows, which are difficult to see completely impossible to overcome.
  • the electrostatic device by inducing an electric charge on the filaments, causes their relative displacement in space, either by the electric field created by the electrostatic device itself, or by repulsion with neighboring filaments which have the same polarity.
  • the figure 7 shows two examples of the trajectories followed by the filaments in the case where there is no electrostatic device Figure 7.1 and in case there is one Figure 7.2 .
  • the web generally has a cloudy appearance consisting of areas containing a large number of strongly interwoven filaments and areas containing a much smaller number of filaments. All the physical properties of the veil (such as the mass per unit area, the behavior under traction, permeability to a gas, a liquid or a powder) are altered by this heterogeneity.
  • the invention overcomes this disadvantage by making it possible to obtain a veil having good properties for a long period of operation.
  • the Corona effect explained above in a very simplified way is in fact an extremely complex physical phenomenon.
  • the molecules and ions created in this reaction are very strongly dependent on the polarity and the composition and quality of the gas present in the space between the electrode and the flat plate.
  • chemical molecules present in the gas may as well as the filaments receive an electrostatic charge and suffer the effects of electrostatic forces. These molecules will then be displaced horizontally either towards the electrode or towards the flat plate and may be deposited on these elements causing pollution of the device.
  • the observed effect of this pollution is the reduction of the Corona effect, which induces a decrease of the current at constant voltage and which imposes to increase the voltage necessary to establish a given current.
  • the effect of fouling is characterized by an increase in the applied voltage in order to maintain the current at the desired value and then, when the maximum available voltage is reached, by a decrease of the current .
  • the appearance of the veil changes gradually from the almost uniform appearance of the figure 8.2 . to the heterogeneous aspect of the figure 8.1 . Below a certain current value, the appearance becomes too cloudy and the product is no longer acceptable to the end user. The tower is then stopped to allow cleaning of the device.
  • the judgment criterion for deciding the shutdown for cleaning is usually a minimum current level below which the nonwoven is considered non-compliant.
  • Dehumidification can greatly reduce the loss of efficiency over time due to pollution.
  • a second dehumidifier on the slots (air inlet) of the drawing device.
  • the drawing air being injected under pressure, the trigger cools the air and creates by condensation water droplets very harmful to the electrostatic device. By dehumidifying, this increases the duration during which the tower functions well.
  • the cooling device has an air inlet and a third dehumidifier is mounted on the cooling air inlet.
  • the volume of dehumidified air is thus relatively large and little pollution remains in the tower.
  • the tower includes a fourth dehumidifier mounted on an air inlet slit in the forming system.
  • the tower has a suction device below the conveyor belt and the first and / or second and / or third and / or the fourth dehumidifier is constituted by a device for recycling at least a portion of the air forming and / or cooling and / or entering through the air inlet slit and / or drawing air which is sucked by the suction device to the formation air inlet and / or to the cooling air inlet and / or to the entry slit of the formation system and / or to the inlet drawing air.
  • the tower may have a humidity sensor at an air inlet in the tower, controlling, by a regulating device, a regulating damper of the air flow sucked by the suction device.
  • the tower can also have an air humidity sensor entering the tower, controlling, by a regulating device, a register regulating the flow of recycled air.
  • the tower may have below the conveyor two separate suction devices, one called vacuum forming below the formation system, the other said holding vacuum downstream of the formation vacuum and there is a device recirculating air holding vacuum at the spunbond tower.
  • the dehumidifiers comprise, from upstream to downstream in the direction of entry of air into the tower, a heat exchanger for cooling the air to condense the moisture into droplet. water, a droplet separator and a heater, so as to reduce, preferably, the moisture content of the dehumidified air between 20 and 30%.
  • the relative humidity of the air is the ratio reduced as a percentage of the partial pressure of water vapor contained in the air to the saturation vapor partial pressure under identical temperature and pressure conditions.
  • the relative humidity of the air can be measured using relative humidity sensors that directly convert the moisture content of the air into an electrical signal.
  • the granulated polymer is melted in an extruder and then spun through a die (103) as continuous filaments (104).
  • the fumes emitted during spinning are collected by a capture device (105).
  • the filaments are then cooled in a cooling device (106) by a current of air at controlled temperature and speed and then introduced into a drawing device (107).
  • This device makes it possible to apply a tensile stress on the filaments which allows the orientation of the molecular chains and the obtaining of the desired diameter.
  • an additional device is generally arranged to allow the removal of the filaments on a conveyor belt to form the nonwoven web (110).
  • the main function of this training device is to reduce the speed of the filaments, to disperse the packets of filaments as uniformly as possible over the width of the machine and to allow a random and homogeneous removal on the conveyor.
  • the device (107) and the device (108) form a filament driving device downwardly by a stream of air.
  • a suction device (111) located under the fabric of the conveyor makes it possible to press and hold the tablecloth on the conveyor.
  • the nonwoven web then passes through a compacting (112) and consolidating (113) device.
  • the latter may be a calendering system or any other consolidation device (mechanical needling, chemical bonding, fluid jet bonding).
  • the web is then routed to the rest of the process.
  • the drawing device installed vertically, consists of a continuous slot (201) into which the curtain of filaments is introduced.
  • the drawing effect is generally obtained by a flow of air flowing from top to bottom which causes the filaments to friction by air.
  • the air stream can be either generated by the introduced air flow for the cooling of the filaments (closed system), or by additional air injection in the drawing device which causes a venturi effect flow ( open system).
  • the forming system generally comprises an air-flow system (for example a diffuser, FIG. 1-114) which modifies the profile of the air flow at the exit of the drawing device.
  • an air-flow system for example a diffuser, FIG. 1-114
  • An electrostatic type device (FIG. 1-117) judiciously completes the effectiveness of the diffuser on the unbundling of filament packets.
  • the relative humidity of the desired air being generally lower than the ambient conditions encountered in the production plants, the solution adopted to reach the relative humidity of the required air will be a cooling of the air, below its point. dew to condense excess moisture, followed by reheating to restore the desired temperature.
  • Such a device as shown on the figure 1 will be set up on the filament cooling air and comprises an air / water heat exchanger (1001), a droplet separator (1002) equipped with a condensate outlet (1003).
  • a temperature sensor (1004) located downstream of the droplet separator makes it possible to control and regulate the outlet temperature of the cooler by acting either on the water flow or on the water temperature in the cooler. By cooling, the air is thus brought to the desired dew point temperature for the process.
  • the desired value is generally between 5 and 15 ° C and preferably less than 10 ° C. Finding lower values requires devices that consume more energy and do not provide significant enough improvement to justify the necessarily higher operating costs.
  • a heater (1005) then allows the air to be brought back to the required final temperature, generally between 10 and 35 ° C, more commonly in the range 15 ° C to 30 ° C.
  • the heater power is regulated by a temperature / humidity sensor (1006) located downstream of the heater. Thanks to the humidity measurement, the user can thus control the relative humidity obtained.
  • the device can also be improved by automatically controlling the temperature of the air at the outlet of the cooling according to the desired relative humidity in the end.
  • An identical device is set up on the air injection inlet of the drawing device and comprises the cooler (1007), the droplet separator (1008) with the condensate outlet (1009) and the heater (1011).
  • the temperature at the outlet of the cooler is controlled by means of the temperature sensor 1010.
  • the temperature and the final humidity are controlled by means of the temperature and humidity sensor 1012.
  • the control of the humidity of the air at the injection slots of the diffuser is especially important, especially since the air introduced through these slots passes close to the electrodes.
  • the air treatment can be done by a device identical to the previous one, namely cooling, removal of condensate and reheating. This device can possibly be avoided in the case where the air flow evacuated by the suction device ( fig 1 111) located under the training canvas discharges only a quantity of air corresponding to the air injected into the slots of the drawing device and to the air introduced at the inlet of the drawing device.
  • the total outflow from the formation system (Q4) consists of the flow rate supplied by the drawing unit (Q1), supplemented by the flow rate supplied by the air injection slots of the formation system (Q2 and Q3) .
  • the proportion between the flows can vary according to the geometry of the diffuser and the slots.
  • the flow rate Q1 brought by the drawing device represents 50 to 80% of the total flow Q4 leaving the formation system, the flow rate Q2 + Q3 entering through the injection slots of the formation system then being between 20 and 50% of the flow Q4.
  • the flow rate Q5 sucked by the suction device located under the forming conveyor is less than the outgoing flow Q4 of the forming system, a part of the latter is therefore discharged in two flow rates Q6 and Q7.
  • the formation system is disposed inside a box (1101) isolating the device from the ambient air, the flow rates Q6 and Q7 are then re-aspirated at Q2 and Q3 at the slots of the training system. .
  • An opening in the isolation chamber allows the entry or the discharge of the flow rate Q8 necessary to balance all flow rates.
  • the temperature injected at the flow rates Q2 and Q3 increases gradually causing a decrease in relative humidity. After a few minutes of operation the assembly stabilizes at the value (temperature and / humidity) sought.
  • a sensor (1102) located in the suction area of the flow rates Q2 and Q3 makes it possible to measure the temperature and humidity values. It can be connected via a regulating device (1103) to a motorized damper (1104) which allows the control of the flow sucked by the fan (1105).
  • the figure 3 shows a device comprising a network of ducts (1201) for returning a portion of the air exiting the suction fan to the insulating box.
  • the flow Q5 sucked by the fan is equal to the flow Q4 outgoing training system.
  • the flow Q5 is divided into a flow Q6 discharged to the outside and a flow Q7 re-circulated to the isolation box.
  • the flow Q7 is adjusted for example by means of a motorized register (1203).
  • a sensor (1202) installed in the isolation box controls the temperature and humidity of the air.
  • the register (1203) can optionally be automatically controlled by the temperature and humidity measurement provided by the sensor (1202) by an automatic regulation system.
  • This device makes it possible to adjust the re-circulated flow rate proportion without modifying the quantity of air sucked through the conveyor belt. Indeed, the latter is often imposed by other parameters of the process and the fact of varying this value to control the temperature and humidity in the isolation chamber, as indicated on the figure 2 , can lead to the appearance of new defects on the nonwoven web.
  • Defects created by poor adjustment of the suction flow rate under the conveyor may be holes in the veil, half-moons or other defects that are related to the fact that the filaments are not sufficiently held on the fabric of the conveyor. conveyor by suction, move because of drafts.
  • the figure 4 shows a device with a double suction system under the conveyor.
  • the first device (1301) called forming void and located directly under the outlet of the forming device acts directly during the formation of nonwoven web on the conveyor.
  • the second suction device (1302) called holding vacuum is located downstream following the conveyor scroll. It ensures a good hold of the veil during transportation to the pressure roller or consolidation device.
  • the two devices are adjustable independently of each other and may each include a system for recirculation of air.
  • the air from the formation vacuum (flow Q5) is discharged completely outwards, so as to effectively remove the gaseous products from the corona effect.
  • the air from the holding vacuum (flow Q9) is re-circulated partially or completely by the motorized damper (1304) to obtain the required temperature and humidity values measured by the sensor (1303).

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Nonwoven Fabrics (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Treatment Of Fiber Materials (AREA)

Claims (10)

  1. Spinnvliesturm, umfassend nacheinander von oben nach unten:
    - eine Spinndüse (103) zur Bildung von Filamenten aus Kunststoffmaterial,
    - eine Vorrichtung (106) zum Kühlen der durch die Spinndüse gebildeten Filamente,
    - eine Vorrichtung (107) zum Strecken der durch die Kühlvorrichtung gekühlten Filamente, und
    - ein System (108) zum Formieren auf einem Förderband eines Vlieses aus den durch die Streckvorrichtung gestreckten Filamente, wobei dieses System eine elektrostatische Vorrichtung (117) aufweist und ein Formierungslufteintritt zwischen der Unterseite der Streckvorrichtung und der Oberseite des Formierungssystems vorgesehen ist, gekennzeichnet durch einen ersten Entfeuchter für die Formierungsluft.
  2. Spinnvliesturm nach Anspruch 1, gekennzeichnet durch einen Lufteintritt in die Streckvorrichtung und durch einen zweiten Entfeuchter (1007 bis 1010), der am Strecklufteintritt montiert ist.
  3. Spinnvliesturm nach Anspruch 1 oder 2, wobei die Kühlvorrichtung einen Kühllufteintritt aufweist, gekennzeichnet durch einen dritten Entfeuchter (1001 bis 1005), der am Kühllufteintritt montiert ist.
  4. Spinnvliesturm nach Anspruch 1, 2 oder 3, wobei ein Lufteintrittsspalt im Formierungssystem vorgesehen ist, gekennzeichnet durch einen vierten Entfeuchter für die durch den Spalt eintretende Luft.
  5. Spinnvliesturm nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der erste und/oder der zweite und/oder der dritte und/oder der vierte Entfeuchter in Strömungsrichtung des Lufteintritts in den Turm umfasst:
    einen Luft-/Wassertauscher, um die Luft zu kühlen, um dort die Feuchtigkeit in Wassertropfen zu kondensieren, einen Tropfenabscheider und eine Heizung, um die relative Luftfeuchtigkeit vorzugsweise zwischen 20 und 30 % zu bringen.
  6. Spinnvliesturm nach einem der vorhergehenden Ansprüche, mit einer Saugvorrichtung unter dem Förderband, dadurch gekennzeichnet, dass der erste und/oder der zweite und/oder der dritte und/oder der vierte Entfeuchter durch eine Rückführungsvorrichtung mindestens eines Teils der Formierungs- und/oder Kühlluft und/oder der durch den Lufteintrittsspalt eintretenden Luft und/oder der durch die Saugvorrichtung am Eintritt der Formierungsluft und/oder am Eintritt der Kühlluft und/oder am Eintrittsspalt des Formierungssystems und/oder am Eintritt der Streckluft angesaugten Streckluft gebildet ist.
  7. Spinnvliesturm nach Anspruch 6, gekennzeichnet durch einen Feuchtigkeitssensor (1102) an einem Lufteintritt in den Turm, der über eine Regelvorrichtung (1103) eine Regelklappe (1104) zum Regeln des Durchflusses der durch die Saugvorrichtung (1105) angesaugten Luft steuert.
  8. Spinnvliesturm nach Anspruch 6, gekennzeichnet durch einen Feuchtigkeitsensor (1102) für die in den Turm eintretende Luft, der über eine Regelvorrichtung eine Regelklappe steuert, die den Durchfluss der zurückgeführten Luft regelt.
  9. Spinnvliesturm nach einem der Ansprüche 6 bis 8, umfassend unterhalb des Förderbands zwei getrennte Saugvorrichtungen, die eine für Formierungsunterdruck (1301) unterhalb des Formierungssystems, die andere für Halteunterdruck (1302), nachgelagert dem Formierungsunterdruck.
  10. Spinnvliesturm nach Anspruch 9, gekennzeichnet durch eine Vorrichtung (1304) zum Rückführen der Luft des Halteunterdrucks zum Spinnvliesturm.
EP09736251A 2008-09-16 2009-08-28 Spinnvliesturm mit elektrostatischer vorrichtung Not-in-force EP2337882B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0805059A FR2935992B1 (fr) 2008-09-16 2008-09-16 Tour spunbond a dispositif electrostatique.
PCT/FR2009/001042 WO2010031913A2 (fr) 2008-09-16 2009-08-28 Tour spunbond a dispositif electrostatique

Publications (2)

Publication Number Publication Date
EP2337882A2 EP2337882A2 (de) 2011-06-29
EP2337882B1 true EP2337882B1 (de) 2013-02-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP09736251A Not-in-force EP2337882B1 (de) 2008-09-16 2009-08-28 Spinnvliesturm mit elektrostatischer vorrichtung

Country Status (5)

Country Link
US (1) US20110217404A1 (de)
EP (1) EP2337882B1 (de)
CN (1) CN102187024B (de)
FR (1) FR2935992B1 (de)
WO (1) WO2010031913A2 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104865993A (zh) * 2015-03-25 2015-08-26 广东工业大学 适用于静电纺丝的恒温恒湿箱及恒温恒湿方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103882540A (zh) * 2014-03-18 2014-06-25 东华大学 静电分丝器
DE202015104817U1 (de) * 2015-09-11 2015-10-09 Krones Ag Vorrichtung zur Bereitstellung von Reinluft in einer Getränkeabfüllanlage
CN106930006A (zh) * 2017-03-28 2017-07-07 吴江市昌华纺织厂 一种可循环利用气体的纺粘设备

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
DE3400847C1 (de) * 1984-01-12 1985-08-29 Fa. Carl Freudenberg, 6940 Weinheim Verfahren zur Herstellung von Spinnvliesen aus aerodynamisch verstreckten Faeden
DE19504953C2 (de) * 1995-02-15 1999-05-20 Reifenhaeuser Masch Anlage für die Herstellung einer Spinnvliesbahn aus thermoplastischen Endlosfäden
FR2815647B1 (fr) * 2000-10-20 2003-02-14 Rieter Perfojet Installation de production d'une nappe non tissee a difusseur et a separation des filaments par voie electrostatique
US7488441B2 (en) * 2002-06-15 2009-02-10 Kimberly-Clark Worldwide, Inc. Use of a pulsating power supply for electrostatic charging of nonwovens
FR2861750B1 (fr) * 2003-10-31 2006-02-24 Rieter Perfojet Machine de production d'un nontisse fini.
JP4434839B2 (ja) * 2004-05-31 2010-03-17 ユニチカ株式会社 コロナ放電装置
JP4402685B2 (ja) * 2006-12-22 2010-01-20 春日電機株式会社 帯電電極装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104865993A (zh) * 2015-03-25 2015-08-26 广东工业大学 适用于静电纺丝的恒温恒湿箱及恒温恒湿方法

Also Published As

Publication number Publication date
EP2337882A2 (de) 2011-06-29
WO2010031913A3 (fr) 2010-05-14
FR2935992A1 (fr) 2010-03-19
CN102187024A (zh) 2011-09-14
CN102187024B (zh) 2012-07-18
WO2010031913A2 (fr) 2010-03-25
US20110217404A1 (en) 2011-09-08
FR2935992B1 (fr) 2010-09-17

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