EP3543385B1 - Sliver forming unit of a card - Google Patents

Sliver forming unit of a card Download PDF

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Publication number
EP3543385B1
EP3543385B1 EP19160975.9A EP19160975A EP3543385B1 EP 3543385 B1 EP3543385 B1 EP 3543385B1 EP 19160975 A EP19160975 A EP 19160975A EP 3543385 B1 EP3543385 B1 EP 3543385B1
Authority
EP
European Patent Office
Prior art keywords
funnel
fleece
forming unit
sliver
card
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.)
Active
Application number
EP19160975.9A
Other languages
German (de)
French (fr)
Other versions
EP3543385A1 (en
Inventor
Tonny Raaijmakers
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.)
Maschinenfabrik Rieter AG
Original Assignee
Maschinenfabrik Rieter AG
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Publication date
Application filed by Maschinenfabrik Rieter AG filed Critical Maschinenfabrik Rieter AG
Publication of EP3543385A1 publication Critical patent/EP3543385A1/en
Application granted granted Critical
Publication of EP3543385B1 publication Critical patent/EP3543385B1/en
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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G15/00—Carding machines or accessories; Card clothing; Burr-crushing or removing arrangements associated with carding or other preliminary-treatment machines
    • D01G15/02—Carding machines
    • D01G15/12—Details
    • D01G15/46—Doffing or like arrangements for removing fibres from carding elements; Web-dividing apparatus; Condensers
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G15/00—Carding machines or accessories; Card clothing; Burr-crushing or removing arrangements associated with carding or other preliminary-treatment machines
    • D01G15/02—Carding machines
    • D01G15/12—Details
    • D01G15/46—Doffing or like arrangements for removing fibres from carding elements; Web-dividing apparatus; Condensers
    • D01G15/465—Doffing arrangements for removing fibres using, or cooperating with, pneumatic means
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G15/00—Carding machines or accessories; Card clothing; Burr-crushing or removing arrangements associated with carding or other preliminary-treatment machines
    • D01G15/02—Carding machines
    • D01G15/12—Details
    • D01G15/46—Doffing or like arrangements for removing fibres from carding elements; Web-dividing apparatus; Condensers
    • D01G15/50—Stripping-rollers or like devices
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H13/00—Other common constructional features, details or accessories
    • D01H13/04—Guides for slivers, rovings, or yarns; Smoothing dies
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
    • D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
    • D01H5/70—Constructional features of drafting elements
    • D01H5/72—Fibre-condensing guides

Definitions

  • the present invention relates to a device for guiding a nonwoven web in a web forming unit of a card.
  • the card produces a card sliver from the fiber material fed in, which is then processed into a yarn.
  • a feed chute is usually assigned to a card, which is supplied with fibers from a blow room by a conveyor system.
  • the fibers are cleaned and parallelized by the card. To do this, the fibers are fed over a card drum.
  • the fibers are removed from the card drum by a doffer in the form of a fiber fleece and fed to a sliver forming unit.
  • the pick-up essentially consists of a pick-up roller, a transfer roller and a pair of output rollers.
  • the fiber fleece extends over the entire working width of the card. In the sliver-forming unit, the fiber fleece is brought together to form a card sliver.
  • the fiber fleece After leaving the pair of output rollers, the fiber fleece encounters a fiber fleece guide element which causes the fiber fleece to be conveyed in the axial direction of the output roller pair. As a result, the fibers of the fiber fleece are brought together to form a fleece band.
  • a fiber fleece guide element For cards with a larger working width, for example, two cross-belts working together in opposite directions are used as the fiber fleece guide element.
  • the fleece band arrives via various guides and funnels to a pair of pressure rollers, which finalize the card sliver.
  • a device for guiding a fleece band in a band-forming unit of a card according to the EP 3 153 607 A1 known.
  • the fleece coming from the customer is brought together by a fleece guide element to form a fleece belt and fed to a pre-compression ring.
  • the fleece tape is then fed to a first and a subsequent second insertion device, the second insertion device being provided with a compressed air supply.
  • the first insertion device protrudes into the second insertion device.
  • With the compressed air an air flow with a swirl is generated in the space between the first insertion device and the second insertion device in such a way that in the As a result, a vacuum is created in the first insertion device. This negative pressure pulls the fleece band through the first insertion device.
  • the fleece strip arrives at a pair of nip rollers which shape the fleece strip into a card sliver.
  • the single-stage compression of the fleece belt is a disadvantage here. At high belt speeds, this leads to the fleece belt building up in front of the end funnel. Air is pressed out of the fleece strip in one fell swoop, which causes fibers or parts of the fleece strip to be spliced off.
  • the air contained in the fleece belt in front of the first insertion device causes the fleece belt to expand in places without tight guidance (for example between the pre-compression ring and the first insertion device) and, on the other hand, a high force is necessary to move the fleece belt without active conveyance through a conically tapering one Guide such as the supercharger ring or the first introducer to suck.
  • a conically tapering one Guide such as the supercharger ring or the first introducer to suck.
  • the air contained in the fleece belt must either be able to escape or be compressed accordingly, which is not guaranteed by the disclosed design of the fleece belt guide.
  • the EP 0 298 507 A2 a device for the automatic merging of a textile fiber fleece to form a sliver.
  • the fiber fleece is brought together via a funnel trough to form a fleece belt and transferred into a funnel-shaped transport channel.
  • At the end of this transport channel there is an annular gap nozzle which generates a concentric flow in the direction of transport.
  • the fleece strip arrives in a mouthpiece channel at the outlet of which a further annular gap nozzle is attached.
  • the nonwoven ribbon passes through another mouthpiece channel to a pair of calender rollers, where it is formed into a fiber ribbon.
  • a twisting flow in the first annular gap nozzle is intended to bring about a tapering of the fleece strip when it is threaded in when the device is restarted.
  • a disadvantage of the proposed band-forming unit is that when the nonwoven band hits the calender rolls, it accumulates at the nipping point of the calender rolls, which leads to blockages. It is also disadvantageous that the fleece belt is guided through a large number of transport channels, annular gap nozzles and mouthpiece channels, since each transition from one channel piece to one can lead to buildup, fiber build-up and flow disturbance.
  • the DE 101 45 733 A1 also discloses a sliver forming unit for forming a sliver in a card.
  • the fleece belt is fed through a pile funnel to a pair of calender rollers.
  • One of the two calender rolls is resiliently mounted.
  • a force on the nonwoven strip at the nip point of the pair of calender rollers can be adjusted to the fiber material to be processed.
  • the device provided also enables the possibility of a distance between the calender rolls.
  • the disadvantage here is that a pre-setting of the distance between the calender rolls during start-up does not prevent the fibers from thawing before the nipping point. At a high production speed, the fibers begin to accumulate in front of the nipping point before they can be picked up by the pair of calender rollers.
  • the object of the present invention is thus to create a device for guiding a nonwoven band in a band-forming unit of a card, which ensures trouble-free guidance of the nonwoven band and prevents the fleece band from damming up or evading from the guide.
  • Another object of the invention is to simplify threading of the nonwoven tape into the tape-forming unit.
  • the object is achieved by a device with the features of the independent patent claim as well as by a sliver-forming unit or a card, which comprise such a device.
  • a device for guiding a nonwoven web for a sliver forming unit of a card with a guiding funnel, with a double-walled end funnel and with a pair of pressure rollers consisting of an upper pressure roller and a lower pressure roller, a distance between the upper pressure roller and the lower pressure roller being adjustable.
  • the adjustment of the distance can be driven pneumatically or via a lever mechanism. This adjustment option is helpful in a threading process.
  • the distance between the pressure rollers can be reset to the desired value, while the pressure rollers move towards the fleece strip already located between them.
  • the fleece tape is guided through the nipping point of the pressure rollers without any resistance, which means that there is no risk of the fleece tape building up.
  • an adjustment or regulation of the force with which the pressure rollers are pressed against one another can be provided.
  • the design of the end funnel as a double-walled cone means that additional elements for introducing conveying air, such as annular gap nozzles, can be dispensed with.
  • the introduction of air through a double-walled funnel also causes suction and transport of the fleece belt without the flow air being applied directly to the fleece belt, as is the case with a conveyor nozzle.
  • the guide funnel is arranged in front of the end funnel and the end funnel in front of the pair of pressure rollers.
  • the end funnel has a compressed air supply.
  • a pre-funnel is provided between the guide funnel and the end funnel.
  • the arrangement of the pre-funnel between the guide funnel and the end funnel makes it possible to provide a finer gradation of the conicity of the individual funnels or guide elements.
  • the difference between the cross-sections at the inlet and the outlet of a guide element, for example the pre-funnel or the guide funnel, can be made smaller.
  • the inlet cross-section of the end funnel can also be selected to be smaller, so that in the end funnel less compression of the fleece strip has to take place in its guidance up to the pair of pressure rollers.
  • Some of the air contained in the fleece belt can also escape between the individual guide elements, which means that less compression is necessary in the following guide element.
  • the discharging air can be disposed of by active suction in the area of the guide elements.
  • the pre-funnel is advantageously provided with a compressed air supply and is double-walled. This makes it possible to support the guidance of the fleece belt with active promotion. This is useful for a threading process at the beginning of production or when resuming an interrupted production.
  • the run of the fleece tape is supported by the guide elements with the aid of the compressed air.
  • the compressed air is fed into the cavity of the double-walled pre-funnel and brought into this cavity in the direction of movement of the fleece belt, where the compressed air exits through an annular gap in the conveying direction.
  • the fleece tape is compressed by the outflowing compressed air and moved from the pre-funnel towards the end funnel and, on the other hand, there is suction in the pre-funnel, which sucks the fleece tape from the upstream guide funnel.
  • a control of the compressed air connection of the pre-funnel is advantageously coupled with the adjustment of the distance between the upper pressure roller and the lower pressure roller.
  • a coupling with the compressed air connection of the end funnel is particularly preferred. In this way, the control has the option of coordinating optimal conditions and active conveyance of the web sliver in the event of malfunctions in the web guide or when the card starts up.
  • the compressed air supply to the pre-funnel is preferably open in a start-up mode.
  • the incoming fleece strip must be conveyed through the guide elements.
  • the active promotion of the pressure roller pair is missing until the point in time when the fleece tape actually reaches the pressure roller pair.
  • the compressed air supply on the pre-funnel is opened for a certain period of time, which supports the fleece belt on its way to the pair of pressure rollers.
  • the threading process is triggered by a manual command to the control.
  • the pressure rollers are preferably adjusted to a maximum distance during at least a first part of the time the air supply to the pre-funnel is opened. As soon as the end of the fleece tape through the pre-funnel and the subsequent End funnel is promoted, this can happen unhindered due to the adjustment of the distance between the pressure roller pair. Only when the end of the nonwoven strip has left the pair of pressure rollers behind, the pressure rollers are brought together again and the distance determined for production is set.
  • a sliver forming unit for a card with a device for guiding a fleece ribbon as described above wherein the ribbon forming unit is provided with two transverse belts for bringing together the fiber fleece.
  • the use of moving transverse belts has the advantage over static fleece guide elements that there is no friction between the guide element and the fibers to be moved. A merging of wide fiber webs in high-performance cards is more gentle on the fibers through the use of transverse belts.
  • fleece belt guides are provided between the transverse belts.
  • the fleece belt leaving the transverse belts is delimited on all sides by the fleece belt guide as a further guide element and introduced into the guide funnel with a predetermined cross section.
  • a card with a sliver-forming unit is also proposed, two transverse belts and a device for guiding the fleece belt being provided in the sliver-forming unit.
  • Figure 1 shows a card 1 equipped with a feed chute 2, a feed chute 5 and a feed channel 3. After they have passed through the various process stages of a blow room, fiber flocks 4 arrive in the feed chute 2.
  • the fiber flocks 4 are fed through the feed chute 5, comprising a feed roller 6 and an opening roller 7 and an air supply 8, passed on to the feed channel 3.
  • an air supply 8 is provided to support the transfer of flakes to the feed channel 3 and to ensure lap compaction upstream of a feed device 10 of the card 1.
  • the air supply 8 blows air tangentially along the opening roller 7 into the feed channel 3 and thereby compresses the fiber flocks into a wad with a high wad weight necessary for further processing in the card 1.
  • a feed device 10 following the feed channel 3 feeds the fiber flocks, now in the form of a homogeneous wadding 11, to the licker-in module 12 of the card 1.
  • the fiber flocks released by the feed device 10 from the lap mat 11 are opened further by the lickerins contained in the lickerin module 12 and at the same time freed from some of the impurities contained therein.
  • the last lickerin of the lickerin module 12 finally transfers the fibers to the card drum 13, which completely dissolves and parallelizes the fibers.
  • the card drum 13 works together with the cover assembly 14 for this purpose.
  • the fibers After the fibers have in some cases made several revolutions on the card drum 13, they are removed from the card drum 13 by a removal unit 15 in the form of a fiber fleece 17 and fed to a sliver formation unit 16 with a pair of output rollers 9.
  • the sliver forming unit 16 transforms the fiber fleece 17 formed by the card drum 13 into a card sliver 19.
  • the card sliver 19 is then placed in a can for further transport (not shown).
  • FIG Figure 2 shows a schematic side view of a band forming unit 16 with a device according to the invention and Figure 3 a schematic plan view in direction X of the band forming unit 16 according to FIG Figure 2 .
  • the fiber fleece 17 arriving in the band forming unit 16 in the direction of movement 23 is picked up by a pair of output rollers 9 and passed on to cross bands 20 arranged in pairs.
  • the fiber fleece 17 is combined in the direction of the longitudinal axis of the output roller pair 9 to form a fleece belt 18.
  • the fiber fleece 17 is guided transversely to its direction of movement 23 in the pair of output rollers 9 between the two transverse belts 20.
  • the transverse belts 20 can be provided with limiting profiles 22 on their surfaces.
  • fleece belt guides 21 are shown by way of example.
  • the fleece belt guide 21 can be dispensed with.
  • the guide funnel 24 serves to reduce the size of the fleece strip 18 and to pass it on to the pre-funnel 25.
  • the pre-funnel 25 is provided with a compressed air supply 30.
  • the pre-funnel 25 is double-walled so that the compressed air supplied in the pre-funnel 25, seen in the direction of movement of the fleece belt 18, is brought to the end of the pre-funnel 25 and exits over its cross-section. This creates a suction in the pre-funnel 25 which supports the fleece belt 18 in its movement.
  • the fleece strip 18 passes into an end funnel 26 and then into a pair of pressure rollers consisting of an upper pressure roller 27 and a lower pressure roller 28.
  • the pair of pressure rollers forms the fleece band 18 into a card sliver 19.
  • Another function of the pair of pressure rollers is to pull the fleece tape 18 through the funnels 24, 25 and 26.
  • the end funnel 26 is provided with a compressed air supply 31.
  • the end funnel 26 is double-walled, so that the compressed air supplied in the end funnel 26, as seen in the direction of movement of the fleece belt 18, is brought to the end of the end funnel 26 and exits distributed over its cross section.
  • the air duct in the end funnel 26 is advantageously designed in such a way that the air flowing through is provided with a swirl.
  • a suction arises in the pre-funnel 25 on the one hand, which supports the movement of the fleece strip 18 and, on the other hand, the twist ensures that the fleece strip 18 is slightly twisted and thus becomes more compact.
  • the end funnel 26 can, as shown, be extended by a cylindrical extension between the upper and lower pressure rollers 27 and 28, so that the fleece tape 18 is guided as close as possible to the nipping point of the pressure roller pair.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Preliminary Treatment Of Fibers (AREA)

Description

Die vorliegende Erfindung betrifft eine Vorrichtung zur Führung eines Vliesbandes in einer Bandbildungseinheit einer Karde.The present invention relates to a device for guiding a nonwoven web in a web forming unit of a card.

Die Karde produziert aus eingespeistem Fasergut ein Kardenband, welches in der Folge zu einem Garn weiter verarbeitet wird. Dabei ist einer Karde in der Regel ein Füllschacht zugeordnet welcher durch ein Fördersystem mit Fasern aus einer Putzerei versorgt wird. Die Fasern werden durch die Karde gereinigt und parallelisiert. Dazu werden die Fasern über eine Kardentrommel geführt. Von der Kardentrommel werden die Fasern durch einen Abnehmer in Form eines Faservlieses abgenommen und einer Bandbildungseinheit zugeführt. Der Abnehmer besteht dabei im Wesentlichen aus einer Abnahmewalze, einer Übergabewalze und einem Ausgangswalzenpaar. Das Faservlies erstreckt sich über die gesamte Arbeitsbreite der Karde. In der Bandbildungseinheit wird das Faservlies zu einem Kardenband zusammengeführt. Dabei trifft das Faservlies nach Verlassen des Ausgangswalzenpaares auf ein Faservliesleitelement, welches eine Förderung des Faservlieses in Achsrichtung des Ausgangswalzenpaares bewirkt. Dadurch werden die Fasern des Faservlieses zusammengeführt zu einem Vliesband. Bei Karden mit grösserer Arbeitsbreite werden beispielsweise zwei zusammen arbeitende gegenläufige Querbänder als Faservliesleitelement verwendet. Anschliessend gelangt das Vliesband über verschiedene Führungen und Trichter zu einem Druckwalzenpaar welches die endgültige Ausformung des Kardenbandes bewirkt.The card produces a card sliver from the fiber material fed in, which is then processed into a yarn. A feed chute is usually assigned to a card, which is supplied with fibers from a blow room by a conveyor system. The fibers are cleaned and parallelized by the card. To do this, the fibers are fed over a card drum. The fibers are removed from the card drum by a doffer in the form of a fiber fleece and fed to a sliver forming unit. The pick-up essentially consists of a pick-up roller, a transfer roller and a pair of output rollers. The fiber fleece extends over the entire working width of the card. In the sliver-forming unit, the fiber fleece is brought together to form a card sliver. After leaving the pair of output rollers, the fiber fleece encounters a fiber fleece guide element which causes the fiber fleece to be conveyed in the axial direction of the output roller pair. As a result, the fibers of the fiber fleece are brought together to form a fleece band. For cards with a larger working width, for example, two cross-belts working together in opposite directions are used as the fiber fleece guide element. Subsequently, the fleece band arrives via various guides and funnels to a pair of pressure rollers, which finalize the card sliver.

Aus dem Stand der Technik ist beispielsweise eine Vorrichtung zur Führung eines Vliesbandes in einer Bandbildungseinheit einer Karde nach der EP 3 153 607 A1 bekannt. Dabei wird das vom Abnehmer kommende Vlies durch ein Vliesleitelement zu einem Vliesband zusammengeführt und einem Vorverdichterring zugeführt. Das Vliesband wird anschliessend einer ersten und einer nachfolgenden zweiten Einführvorrichtung zugeführt, wobei die zweite Einführvorrichtung mit einer Druckluftzuführung versehen ist. Die erste Einführvorrichtung ragt dabei in die zweite Einführvorrichtung. Mit der Druckluft wird im Zwischenraum zwischen der ersten Einführvorrichtung und der zweiten Einführvorrichtung eine Luftströmung mit einem Drall derart erzeugt, dass in der Folge in der ersten Einführvorrichtung ein Unterdruck entsteht. Dieser Unterdruck zieht das Vliesband durch die erste Einführvorrichtung. Nach der zweiten Einführvorrichtung gelangt das Vliesband zu einem Quetschwalzenpaar welche das Vliesband zu einem Kardenband ausformen. Nachteilig hierbei ist die einstufige Verdichtung des Vliesbandes. Dies führt bei hohen Bandgeschwindigkeiten zum Aufstauen des Vliesbandes vor dem Endtrichter. Dabei wird Luft auf einen Schlag aus dem Vliesband gedrückt, was Abspleissungen von Fasern oder Teilen des Vliesbandes zur Folge hat. Die im Vliesband vor der ersten Einführvorrichtung enthaltene Luft führt dazu, dass sich das Vliesband einerseits an Stellen ohne enge Führung (beispielsweise zwischen dem Vorverdichterring und der ersten Einführungsvorrichtung) ausdehnt und andrerseits eine hohe Kraft notwendig ist um das Vliesband ohne aktive Förderung durch eine konisch zulaufende Führung wie den Vorverdichterring oder die erste Einführvorrichtung zu saugen. Um eine Querschnittsverkleinerung des Vliesbandes zu erreichen muss die im Vliesband enthaltene Luft entweder entweichen können oder entsprechend komprimiert werden, was durch die offenbarte Ausführung der Vliesbandführung nicht gewährleistet ist.From the prior art, for example, a device for guiding a fleece band in a band-forming unit of a card according to the EP 3 153 607 A1 known. The fleece coming from the customer is brought together by a fleece guide element to form a fleece belt and fed to a pre-compression ring. The fleece tape is then fed to a first and a subsequent second insertion device, the second insertion device being provided with a compressed air supply. The first insertion device protrudes into the second insertion device. With the compressed air an air flow with a swirl is generated in the space between the first insertion device and the second insertion device in such a way that in the As a result, a vacuum is created in the first insertion device. This negative pressure pulls the fleece band through the first insertion device. After the second insertion device, the fleece strip arrives at a pair of nip rollers which shape the fleece strip into a card sliver. The single-stage compression of the fleece belt is a disadvantage here. At high belt speeds, this leads to the fleece belt building up in front of the end funnel. Air is pressed out of the fleece strip in one fell swoop, which causes fibers or parts of the fleece strip to be spliced off. The air contained in the fleece belt in front of the first insertion device causes the fleece belt to expand in places without tight guidance (for example between the pre-compression ring and the first insertion device) and, on the other hand, a high force is necessary to move the fleece belt without active conveyance through a conically tapering one Guide such as the supercharger ring or the first introducer to suck. In order to reduce the cross-section of the fleece belt, the air contained in the fleece belt must either be able to escape or be compressed accordingly, which is not guaranteed by the disclosed design of the fleece belt guide.

Weiter offenbart die EP 0 298 507 A2 eine Vorrichtung zu selbsttätigen Zusammenführen eines textilen Faservlieses zu einem Faserband. Dabei wird das Faservlies über eine Trichterwanne zu einem Vliesband zusammengeführt und in einen trichterförmigen Transportkanal überführt. Am Ende dieses Transportkanals ist eine Ringspaltdüse angeordnet, welche eine konzentrische Strömung in Transportrichtung erzeugt. In der Folge gelangt das Vliesband in einen Mundstückskanal an dessen Austritt eine weitere Ringspaltdüse angebracht ist. In der Folge gelangt das Vliesband durch einen weiteren Mundstückskanal zu einem Kalanderwalzenpaar wo es zu einem Faserband geformt wird. Durch eine drallförmige Strömung in der ersten Ringspaltdüse soll eine Zuspitzung des Vliesbandes bei dessen Einfädelung im Falle eines Neustarts der Vorrichtung erreicht werden. Nachteilig an der vorgeschlagenen Bandbildungseinheit ist jedoch, dass bei einem Auftreffen des Vliesbandes auf die Kalanderwalzen sich dieses am Klemmpunkt der Kalanderwalzen aufstaut, was zu Verstopfungen führt. Weiter ist es nachteilig, dass das Vliesband durch eine Vielzahl von Transportkanälen, Ringspaltdüsen und Mundstückskanäle geführt wird, da jeder Übergang von einem Kanalstück zu einem nächsten zu Anhaftungen, Faseransammlungen und Störung der Strömungen führen kann.Further reveals the EP 0 298 507 A2 a device for the automatic merging of a textile fiber fleece to form a sliver. The fiber fleece is brought together via a funnel trough to form a fleece belt and transferred into a funnel-shaped transport channel. At the end of this transport channel there is an annular gap nozzle which generates a concentric flow in the direction of transport. As a result, the fleece strip arrives in a mouthpiece channel at the outlet of which a further annular gap nozzle is attached. As a result, the nonwoven ribbon passes through another mouthpiece channel to a pair of calender rollers, where it is formed into a fiber ribbon. A twisting flow in the first annular gap nozzle is intended to bring about a tapering of the fleece strip when it is threaded in when the device is restarted. A disadvantage of the proposed band-forming unit, however, is that when the nonwoven band hits the calender rolls, it accumulates at the nipping point of the calender rolls, which leads to blockages. It is also disadvantageous that the fleece belt is guided through a large number of transport channels, annular gap nozzles and mouthpiece channels, since each transition from one channel piece to one can lead to buildup, fiber build-up and flow disturbance.

Die DE 101 45 733 A1 offenbart ebenfalls eine Bandbildungseinheit zur Bildung eines Faserbandes in einer Karde. Dabei wird das Vliesband nach Verlassen der Querbänder durch einen Flortrichter einem Kalanderwalzenpaar zugeführt. Eine der beiden Kalanderwalzen ist federnd gelagert. Aufgrund der Auswahl der Feder und damit der Bestimmung der Federkonstanten kann eine auf das zu verarbeitende Fasermaterial abgestimmte Kraft auf das Vliesband im Klemmpunkt des Kalanderwalzenpaares eingestellt werden. Auch die Möglichkeit eines Abstandes zwischen den Kalanderwalzen ist durch die vorgesehene Vorrichtung möglich. Nachteilig dabei ist, dass eine Voreinstellung des Abstandes zwischen den Kalanderwalzen im Anfahrbetrieb ein Auftauen der Fasern vor dem Klemmpunkt nicht verhindert. Bei einer hohen Produktionsgeschwindigkeit beginnen sich die Fasern vor dem Klemmpunkt zu stauen, bevor diese durch das Kalanderwalzenpaar erfasst werden können.The DE 101 45 733 A1 also discloses a sliver forming unit for forming a sliver in a card. After leaving the transverse belts, the fleece belt is fed through a pile funnel to a pair of calender rollers. One of the two calender rolls is resiliently mounted. On the basis of the selection of the spring and thus the determination of the spring constant, a force on the nonwoven strip at the nip point of the pair of calender rollers can be adjusted to the fiber material to be processed. The device provided also enables the possibility of a distance between the calender rolls. The disadvantage here is that a pre-setting of the distance between the calender rolls during start-up does not prevent the fibers from thawing before the nipping point. At a high production speed, the fibers begin to accumulate in front of the nipping point before they can be picked up by the pair of calender rollers.

Aufgabe der vorliegenden Erfindung ist es somit, eine Vorrichtung zur Führung eines Vliesbandes in einer Bandbildungseinheit einer Karde zu schaffen, welche eine störungsfreie Führung des Vliesbandes gewährleistet und ein Aufstauen respektive Ausweichen des Vliesbandes aus der Führung verhindert. Weiter ist es die Aufgabe der Erfindung ein Einfädeln des Vliesbandes in die Bandbildungseinheit zu vereinfachen.The object of the present invention is thus to create a device for guiding a nonwoven band in a band-forming unit of a card, which ensures trouble-free guidance of the nonwoven band and prevents the fleece band from damming up or evading from the guide. Another object of the invention is to simplify threading of the nonwoven tape into the tape-forming unit.

Die Aufgabe wird gelöst durch eine Vorrichtung mit den Merkmalen des unabhängigen Patentanspruchs sowie durch eine Bandbildungseinheit respektive eine Karde, die eine solche Vorrichtung umfassen.The object is achieved by a device with the features of the independent patent claim as well as by a sliver-forming unit or a card, which comprise such a device.

Vorgeschlagen wird eine Vorrichtung zur Führung eines Vliesbandes für eine Bandbildungseinheit einer Karde mit einem Führungstrichter, mit einem doppelwandigen Endtrichter und mit einem Druckwalzenpaar bestehend aus einer oberen Druckwalze und einer unteren Druckwalze, wobei ein Abstand zwischen der oberen Druckwalze und der unteren Druckwalze verstellbar ist. Die Verstellung des Abstandes kann pneumatisch oder über ein Hebelwerk angetrieben sein. Diese Verstellmöglichkeit ist bei einem Einfädelprozess hilfreich. Durch eine Vergrösserung des Abstandes zwischen der oberen und unteren Druckwalze während eines Einfädelvorganges wird der Widerstand eines einlaufenden Vliesbandes am Beginn der Produktion und damit ein Aufstauen des Vliesbandes vor dem Klemmpunkt der Druckwalzen verhindert. Nach dem Einfädelprozess kann der Abstand zwischen den Druckwalzen auf den gewünschten Wert zurückgestellt werden, dabei bewegen sich die Druckwalzen auf das bereits zwischen ihnen befindliche Vliesband zu. Das Vliesband wird bei einem Einfädelprozess durch den Klemmpunkt der Druckwalzen geführt, ohne dass dies Widerstand leisten, wodurch keine Gefahr eines Aufstauen des Vliesbandes besteht. Zusätzlich kann eine Einstellung oder Regelung der Kraft mit welcher die Druckwalzen gegeneinander gepresst werden vorgesehen sein. Durch die Ausbildung des Endtrichters als doppelwandiger Konus kann auf zusätzliche Elemente zur Förderlufteinbringung wie beispielsweise Ringspaltdüsen verzichtet werden. Ebenfalls bewirkt die Lufteinführung durch einen doppelwandigen Trichter ein Ansaugen und transportieren des Vliesbandes ohne dass Strömungsluft direkt auf das Vliesband aufgebracht wird, wie dies beiner Förderdüse der Fall ist.A device is proposed for guiding a nonwoven web for a sliver forming unit of a card with a guiding funnel, with a double-walled end funnel and with a pair of pressure rollers consisting of an upper pressure roller and a lower pressure roller, a distance between the upper pressure roller and the lower pressure roller being adjustable. The adjustment of the distance can be driven pneumatically or via a lever mechanism. This adjustment option is helpful in a threading process. By increasing the distance between the top and lower pressure roller during a threading process, the resistance of an incoming fleece band at the beginning of production and thus a build-up of the fleece band before the nip point of the pressure rollers is prevented. After the threading process, the distance between the pressure rollers can be reset to the desired value, while the pressure rollers move towards the fleece strip already located between them. During a threading process, the fleece tape is guided through the nipping point of the pressure rollers without any resistance, which means that there is no risk of the fleece tape building up. In addition, an adjustment or regulation of the force with which the pressure rollers are pressed against one another can be provided. The design of the end funnel as a double-walled cone means that additional elements for introducing conveying air, such as annular gap nozzles, can be dispensed with. The introduction of air through a double-walled funnel also causes suction and transport of the fleece belt without the flow air being applied directly to the fleece belt, as is the case with a conveyor nozzle.

Der Führungstrichter ist vor dem Endtrichter und der Endtrichter vor dem Druckwalzenpaar angeordnet. Der Endtrichter weist eine Druckluftzuführung auf. Zwischen dem Führungstrichter und dem Endtrichter ist ein Vortrichter vorgesehen. Durch die Anordnung des Vortrichters zwischen dem Führungstrichter und dem Endtrichter ergibt sich die Möglichkeit eine feinere Abstufung der Konizität der einzelnen Trichter respektive Führungselemente vorzusehen. Der Unterschied zwischen den Querschnitten am Eintritt und am Austritt eines Führungselementes, beispielsweise des Vortrichters oder des Führungstrichters, kann geringer ausgeführt werden. Ebenfalls kann der Eintrittsquerschnitt des Endtrichters kleiner gewählt werden, wodurch im Endtrichter eine geringere Komprimierung des Vliesbandes in seiner Führung bis zum Druckwalzenpaar erfolgen muss. Auch kann zwischen den einzelnen Führungselementen ein Teil der im Vliesband enthaltenen Luft entweichen, was dazu führt, dass eine geringere Kompression im nachfolgenden Führungselement notwendig ist. In einer weiteren Ausführungsform kann eine Entsorgung der austretenden Luft durch eine aktive Absaugung im Bereich der Führungselemente vorgesehen sein.The guide funnel is arranged in front of the end funnel and the end funnel in front of the pair of pressure rollers. The end funnel has a compressed air supply. A pre-funnel is provided between the guide funnel and the end funnel. The arrangement of the pre-funnel between the guide funnel and the end funnel makes it possible to provide a finer gradation of the conicity of the individual funnels or guide elements. The difference between the cross-sections at the inlet and the outlet of a guide element, for example the pre-funnel or the guide funnel, can be made smaller. The inlet cross-section of the end funnel can also be selected to be smaller, so that in the end funnel less compression of the fleece strip has to take place in its guidance up to the pair of pressure rollers. Some of the air contained in the fleece belt can also escape between the individual guide elements, which means that less compression is necessary in the following guide element. In a further embodiment, the discharging air can be disposed of by active suction in the area of the guide elements.

Vorteilhafterweise ist der Vortrichter mit einer Druckluftzuführung versehen und doppelwandig ausgebildet. Dadurch ergibt sich die Möglichkeit die Führung des Vliesbandes mit einer aktiven Förderung zu unterstützen. Dies ist bei einem Einfädelungsprozess am Beginn der Produktion oder bei Wiederaufnahme einer unterbrochenen Produktion hilfreich. Das Vliesband wird in seinem Verlauf durch die Führungselemente mithilfe der Druckluft unterstützt. Die Druckluft wird in den Hohlraum des doppelwandig ausgeführten Vortrichters eingespeist und in diesem Hohlraum in Bewegungsrichtung des Vliesbandes gebracht, wo die Druckluft durch einen Ringspalt in Förderrichtung austritt. Als Nebeneffekt wird einerseits das Vliesband durch die ausströmende Druckluft zusammengedrückt und vom Vortrichter gegen den Endtrichter bewegt und andrerseits entsteht im Vortrichter in Sog, welcher das Vliesband aus dem vorgelagerten Führungstrichter ansaugt.The pre-funnel is advantageously provided with a compressed air supply and is double-walled. This makes it possible to support the guidance of the fleece belt with active promotion. This is useful for a threading process at the beginning of production or when resuming an interrupted production. The run of the fleece tape is supported by the guide elements with the aid of the compressed air. The compressed air is fed into the cavity of the double-walled pre-funnel and brought into this cavity in the direction of movement of the fleece belt, where the compressed air exits through an annular gap in the conveying direction. As a side effect, on the one hand, the fleece tape is compressed by the outflowing compressed air and moved from the pre-funnel towards the end funnel and, on the other hand, there is suction in the pre-funnel, which sucks the fleece tape from the upstream guide funnel.

Vorteilhafterweise ist eine Steuerung des Druckluftanschluss des Vortrichters mit der Verstellung des Abstandes zwischen der oberen Druckwalze und der unteren Druckwalze gekoppelt ist. Besonders bevorzugt besteht auch eine Kopplung mit dem Druckluftanschluss des Endtrichters. Dadurch hat die Steuerung die Möglichkeit bei Störungen in der Vliesführung oder auch bei einem Anfahren der Karde optimale Verhältnisse und aktive Förderung des Vliesbandes zu koordinieren.A control of the compressed air connection of the pre-funnel is advantageously coupled with the adjustment of the distance between the upper pressure roller and the lower pressure roller. A coupling with the compressed air connection of the end funnel is particularly preferred. In this way, the control has the option of coordinating optimal conditions and active conveyance of the web sliver in the event of malfunctions in the web guide or when the card starts up.

Bevorzugterweise ist die Druckluftzuführung zum Vortrichter in einem Anfahrbetrieb geöffnet. Bei einem Anfahren (oder Wiederanfahren) der Karde muss das ankommende Vliesband durch die Führungselemente gefördert werden. Dabei fehlt die aktive Förderung des Druckrollenpaares bis zum Zeitpunkt, wenn das Vliesband das Druckrollenpaar tatsächlich erreicht. Um diesem Umstand Rechnung zu tragen wird die Druckluftzuführung am Vortrichter für eine bestimmte Dauer geöffnet, wodurch das Vliesband auf seinem Weg zum Druckrollenpaar unterstützt wird. Eine Auslösung des Einfädelvorganges erfolgt durch einen manuellen Befehl an die Steuerung.The compressed air supply to the pre-funnel is preferably open in a start-up mode. When the card starts up (or starts up again), the incoming fleece strip must be conveyed through the guide elements. The active promotion of the pressure roller pair is missing until the point in time when the fleece tape actually reaches the pressure roller pair. In order to take this into account, the compressed air supply on the pre-funnel is opened for a certain period of time, which supports the fleece belt on its way to the pair of pressure rollers. The threading process is triggered by a manual command to the control.

Bevorzugterweise sind die Druckwalzen auf einen maximalen Abstand verstellt während zumindest eines ersten Teils der Zeit der Öffnung der Luftzuführung zum Vortrichter. Sobald nun das Ende des Vliesbandes durch den Vortrichter und den anschliessenden Endtrichter gefördert wird, kann dieses aufgrund der Verstellung des Abstandes des Druckwalzenpaares dieses ungehindert passieren. Erst wenn das Ende des Vliesbandes das Druckwalzenpaar hinter sich gelassen hat, werden die Druckwalzen wieder zusammengefahren und damit der für die Produktion bestimmte Abstand eingestellt.The pressure rollers are preferably adjusted to a maximum distance during at least a first part of the time the air supply to the pre-funnel is opened. As soon as the end of the fleece tape through the pre-funnel and the subsequent End funnel is promoted, this can happen unhindered due to the adjustment of the distance between the pressure roller pair. Only when the end of the nonwoven strip has left the pair of pressure rollers behind, the pressure rollers are brought together again and the distance determined for production is set.

Weiter wird eine Bandbildungseinheit für eine Karde mit einer Vorrichtung zur Führung eines Vliesbandes nach obiger Beschreibung vorgeschlagen, wobei die Bandbildungseinheit mit zwei Querbändern zur Zusammenführung des Faservlieses versehen ist. Die Verwendung von sich bewegenden Querbändern hat gegenüber statischen Vliesleitelementen den Vorteil, dass keine Reibung zwischen dem Leitelement und den zu bewegenden fasern besteht. Eine Zusammenführung von breiten Faservliesen bei Hochleistungskarden ist durch den Einsatz von Querbändern faserschonender.Furthermore, a sliver forming unit for a card with a device for guiding a fleece ribbon as described above is proposed, wherein the ribbon forming unit is provided with two transverse belts for bringing together the fiber fleece. The use of moving transverse belts has the advantage over static fleece guide elements that there is no friction between the guide element and the fibers to be moved. A merging of wide fiber webs in high-performance cards is more gentle on the fibers through the use of transverse belts.

Bevorzugterweise sind zwischen den Querbändern Vliesbandführer vorgesehen. Durch die Vliesbandführer als ein weiteres Führungselement wird das die Querbänder verlassende Vliesband allseitig eingegrenzt und mit einem vorgegebenen Querschnitt in den Führungstrichter eingebracht.Preferably, fleece belt guides are provided between the transverse belts. The fleece belt leaving the transverse belts is delimited on all sides by the fleece belt guide as a further guide element and introduced into the guide funnel with a predetermined cross section.

Auch wird eine Karde mit einer Bandbildungseinheit vorgeschlagen, wobei in der Bandbildungseinheit zwei Querbänder und eine Vorrichtung zur Führung des Vliesbandes vorgesehen sind.A card with a sliver-forming unit is also proposed, two transverse belts and a device for guiding the fleece belt being provided in the sliver-forming unit.

Durch die Vorrichtung zur Einfädelung des Vliesbandes in einer Bandbildungseinheit einer Karde ist die folgende Verfahrensweise bei einem Produktionsbeginn möglich:

  • Beginnen mit der Faservlies-Produktion der Karde
  • Öffnen der Druckluftzuführung zum Vortrichter und Vergrössern eines Abstandes zwischen der oberen Druckwalze und der unteren Druckwalze
  • Öffnen der Druckluftzuführung zum Endtrichter
  • Zusammenführung des Faservlieses durch die Querbänder zu einem Vliesband
  • Führung des Vliesbandes durch den Einführtrichter
  • Schliessen der Druckluftzuführung zum Vortrichter und Verkleinern des Abstandes zwischen der oberen Druckwalze und der unteren Druckwalze nach Erreichen des Druckwalzenpaares durch das Vliesband.
Das Vliesband wird optisch vordem Erreichen des Führungstrichters erkannt und entsprechend der Vorgang manuell ausgelöst nach welchem durch die Steuerung zu diesem Zeitpunkt die Öffnung der Druckluftzuführung zum Vortrichter vorgenommen wird.The device for threading the fleece strip in a sliver forming unit of a card enables the following procedure at the start of production:
  • Start with the nonwoven production of the card
  • Open the compressed air supply to the pre-funnel and increase the distance between the upper pressure roller and the lower pressure roller
  • Open the compressed air supply to the end funnel
  • The cross belts bring together the fiber fleece to form a fleece belt
  • Guide the fleece band through the insertion funnel
  • Close the compressed air supply to the pre-funnel and reduce the distance between the upper pressure roller and the lower pressure roller after the pair of pressure rollers has been reached by the fleece belt.
The fleece tape is optically recognized before it reaches the guide funnel and the process is accordingly triggered manually, after which the control system opens the compressed air supply to the pre-funnel at this point in time.

Weitere Vorteile der Erfindung sind in den nachfolgenden Ausführungsbeispielen beschrieben. Es zeigen:

  • Figur 1 eine schematische Seitenansicht einer Karde nach dem Stand der Technik,
  • Figur 2 eine schematische Seitenansicht einer Bandbildungseinheit mit einer erfindungsgemässen Vorrichtung und
  • Figur 3 eine schematische Draufsicht in Richtung X der Bandbildungseinheit nach der Figur 2,
Further advantages of the invention are described in the following exemplary embodiments. Show it:
  • Figure 1 a schematic side view of a card according to the prior art,
  • Figure 2 a schematic side view of a band forming unit with a device according to the invention and
  • Figure 3 a schematic plan view in direction X of the band forming unit according to FIG Figure 2 ,

Figur 1 zeigt eine Karde 1 ausgestattet mit einem Füllschacht 2, einem Füllschachtaustrag 5 und einem Speisekanal 3. Faserflocken 4 gelangen nach dem sie die verschiedenen Prozessstufen einer Putzerei durchlaufen haben in den Füllschacht 2. Die Faserflocken 4 werden durch den Füllschachtaustrag 5, umfassend eine Speisewalze 6 und eine Auflösewalze 7 sowie eine Luftzuführung 8, an den Speisekanal 3 weitergegeben. Im Füllschachtaustrag 5 ist für die Unterstützung der Flockenweitergabe an den Speisekanal 3 sowie zur Gewährleistung einer Wattenverdichtung vor einer Speisevorrichtung 10 der Karde 1 eine Luftzuführung 8 vorgesehen. Die Luftzuführung 8 bläst Luft tangential an der Auflösewalze 7 entlang in den Speisekanal 3 und verdichtet dadurch die Faserflocken zu einer Watte mit einem für die weitere Verarbeitung in der Karde 1 nötigen hohen Wattegewicht. Eine auf den Speisekanal 3 nachfolgende Speisevorrichtung 10 speist die Faserflocken, nunmehr in Form einer homogenen Wattenvorlage 11 dem Vorreissermodul 12 der Karde 1 zu. Die von der Speisevorrichtung 10 abgegebenen Faserflocken aus der Wattenvorlage 11 werden durch die im Vorreissermodul 12 enthaltenen Vorreisser weiter geöffnet und gleichzeitig von einem Teil der darin enthaltenen Verunreinigungen befreit. Die letzte Vorreisserwalze des Vorreissermoduls 12 übergibt die Fasern schliesslich an die Kardentrommel 13, welche die Fasern vollständig auflöst und parallelisiert. Die Kardentrommel 13 arbeitet dazu mit dem Deckelaggregat 14 zusammen. Nachdem die Fasern zum Teil mehrere Umläufe auf der Kardentrommel 13 durchgeführt haben, werden sie von einer Abnahmeeinheit 15 in Form eines Faservlieses 17 von der Kardentrommel 13 abgenommen und mit einem Ausgangswalzenpaar 9 einer Bandbildungseinheit 16 zugeführt. Durch die Bandbildungseinheit 16 wird das durch die Kardentrommel 13 ausgebildete Faservlies 17 zu einem Kardenband 19 umgeformt. Das Kardenband 19 wird anschliessend in eine Kanne für den Weitertransport abgelegt (nicht gezeigt). Figure 1 shows a card 1 equipped with a feed chute 2, a feed chute 5 and a feed channel 3. After they have passed through the various process stages of a blow room, fiber flocks 4 arrive in the feed chute 2. The fiber flocks 4 are fed through the feed chute 5, comprising a feed roller 6 and an opening roller 7 and an air supply 8, passed on to the feed channel 3. In the feed chute 5, an air supply 8 is provided to support the transfer of flakes to the feed channel 3 and to ensure lap compaction upstream of a feed device 10 of the card 1. The air supply 8 blows air tangentially along the opening roller 7 into the feed channel 3 and thereby compresses the fiber flocks into a wad with a high wad weight necessary for further processing in the card 1. A feed device 10 following the feed channel 3 feeds the fiber flocks, now in the form of a homogeneous wadding 11, to the licker-in module 12 of the card 1. The fiber flocks released by the feed device 10 from the lap mat 11 are opened further by the lickerins contained in the lickerin module 12 and at the same time freed from some of the impurities contained therein. The last lickerin of the lickerin module 12 finally transfers the fibers to the card drum 13, which completely dissolves and parallelizes the fibers. The card drum 13 works together with the cover assembly 14 for this purpose. After the fibers have in some cases made several revolutions on the card drum 13, they are removed from the card drum 13 by a removal unit 15 in the form of a fiber fleece 17 and fed to a sliver formation unit 16 with a pair of output rollers 9. The sliver forming unit 16 transforms the fiber fleece 17 formed by the card drum 13 into a card sliver 19. The card sliver 19 is then placed in a can for further transport (not shown).

Figur 2 zeigt eine schematische Seitenansicht einer Bandbildungseinheit 16 mit einer erfindungsgemässen Vorrichtung und Figur 3 eine schematische Draufsicht in Richtung X der Bandbildungseinheit 16 nach der Figur 2. Das in der Bandbildungseinheit 16 in der Bewegungsrichtung 23 ankommende Faservlies 17 wird von einem Ausgangswalzenpaar 9 erfasst und an paarweise angeordneten Querbändern 20 weitergeleitet. Durch die Querbänder 20 mit ihrer gegenläufigen Bewegungsrichtung 29 wird das Faservlies 17 in Richtung der Längsachse des Ausgangswalzenpaares 9 zu einem Vliesband 18 zusammengefasst. Dabei wird das Faservlies 17 quer zu seiner Bewegungsrichtung 23 im Ausgangswalzenpaar 9 zwischen die beiden Querbänder 20 geführt. Durch diese Bewegung 29 der Querbänder 20 wird das sich über die Länge des Ausgangswalzenpaares 9 ausgedehnte Faservlies 17 durch die Querbänder 20 zum Vliesband 18 zusammengeführt. Damit die Fasern nicht quer zur Bewegungsrichtung 29 der Querbänder 20 während des Zusammenführens ausweichen, können die Querbänder 20 an ihren Oberflächen mit Begrenzungsprofilen 22 versehen sein. Figure 2 shows a schematic side view of a band forming unit 16 with a device according to the invention and Figure 3 a schematic plan view in direction X of the band forming unit 16 according to FIG Figure 2 . The fiber fleece 17 arriving in the band forming unit 16 in the direction of movement 23 is picked up by a pair of output rollers 9 and passed on to cross bands 20 arranged in pairs. By means of the transverse belts 20 with their opposite direction of movement 29, the fiber fleece 17 is combined in the direction of the longitudinal axis of the output roller pair 9 to form a fleece belt 18. The fiber fleece 17 is guided transversely to its direction of movement 23 in the pair of output rollers 9 between the two transverse belts 20. As a result of this movement 29 of the transverse belts 20, the fiber fleece 17, which extends over the length of the pair of output rollers 9, is brought together by the transverse belts 20 to form the fleece belt 18. So that the fibers do not give way transversely to the direction of movement 29 of the transverse belts 20 during the joining, the transverse belts 20 can be provided with limiting profiles 22 on their surfaces.

Zur Unterstützung der Führung des Vliesbandes 18 zwischen den Querbändern 20 sind beispielhaft Vliesbandführer 21 gezeigt. Durch die Vliesbandführer 21, welche den Raum zwischen den Querbändern 20 und dem Ausgangswalzenpaar 9 und dem Führungstrichter 24 begrenzen und oberhalb und unterhalb der Begrenzungsprofile 22 angeordnet sind, kann eine verbesserte Führung des Vliesbandes 18 erreicht werden. Ist jedoch aufgrund des Volumens des Vliesbandes 18 eine genügende Führung des Vliesbandes 18 durch die Querbänder 20 möglich, kann auf die Vliesbandführer 21 verzichtet werden.To support the guidance of the fleece belt 18 between the transverse belts 20, fleece belt guides 21 are shown by way of example. The fleece belt guide 21, which delimit the space between the transverse belts 20 and the pair of output rollers 9 and the guide funnel 24 and are arranged above and below the delimiting profiles 22, improves the guidance of the fleece belt 18. However, due to the volume of the fleece belt 18, sufficient guidance of the Fleece belt 18 possible through the transverse belts 20, the fleece belt guide 21 can be dispensed with.

Nachdem das Vliesband 18 die Engstelle zwischen den Querbändern 20 durchlaufen hat wird dieses durch einen Führungstrichter 24 übernommen. Der Führungstrichter 24 dient dazu das Vliesband 18 in seiner Ausdehnung zu vermindern und an den Vortrichter 25 weiterzugeben. Der Vortrichter 25 ist mit einer Druckluftzuführung 30 versehen. Dabei ist der Vortrichter 25 doppelwandig ausgebildet, sodass die zugeführte Druckluft im Vortrichter 25, in Bewegungsrichtung des Vliesbandes 18 gesehen, zum Ende des Vortrichters 25 gebracht und über dessen Querschnitt verteilt austritt. Dadurch entsteht im Vortrichter 25 ein Sog welcher das Vliesband 18 in seiner Bewegung unterstützt. Aus dem Vortrichter 25 gelangt das Vliesband 18 in einen Endtrichter 26 und in der Folge in ein Druckwalzenpaar bestehend aus einer oberen Druckwalze 27 und einer unteren Druckwalze 28. Durch das Druckwalzenpaar wird das Vliesband 18 zu einem Kardenband 19 geformt. Eine weitere Funktion des Druckwalzenpaars ist es das Vliesband 18 durch die Trichter 24, 25 und 26 zu ziehen.After the fleece belt 18 has passed through the narrow point between the transverse belts 20, this is taken over by a guide funnel 24. The guide funnel 24 serves to reduce the size of the fleece strip 18 and to pass it on to the pre-funnel 25. The pre-funnel 25 is provided with a compressed air supply 30. The pre-funnel 25 is double-walled so that the compressed air supplied in the pre-funnel 25, seen in the direction of movement of the fleece belt 18, is brought to the end of the pre-funnel 25 and exits over its cross-section. This creates a suction in the pre-funnel 25 which supports the fleece belt 18 in its movement. From the pre-funnel 25, the fleece strip 18 passes into an end funnel 26 and then into a pair of pressure rollers consisting of an upper pressure roller 27 and a lower pressure roller 28. The pair of pressure rollers forms the fleece band 18 into a card sliver 19. Another function of the pair of pressure rollers is to pull the fleece tape 18 through the funnels 24, 25 and 26.

Der Endtrichter 26 ist mit einer Druckluftzuführung 31 versehen. Dabei ist der Endtrichter 26 doppelwandig ausgebildet, sodass die zugeführte Druckluft im Endtrichter 26, in Bewegungsrichtung des Vliesbandes 18 gesehen, zum Ende des Endtrichters 26 gebracht und über dessen Querschnitt verteilt austritt. Vorteilhafterweise ist die Luftführung im Endtrichter 26 derart ausgeführt, dass die durchströmende Luft mit einem Drall versehen wird. Dadurch entsteht im Vortrichter 25 einerseits ein Sog welcher das Vliesband 18 in seiner Bewegung unterstützt und andererseits wird durch den Drall erreicht, dass das Vliesband 18 leicht verdreht und dadurch kompakter wird. Der Endtrichter 26 kann wie gezeigt durch einen zylinderförmigen Fortsatz zwischen die obere und untere Druckwalze 27 und 28 verlängert werden, sodass das Vliesband 18 möglichst nahe an den Klemmpunkt des Druckwalzenpaares geführt wird.The end funnel 26 is provided with a compressed air supply 31. The end funnel 26 is double-walled, so that the compressed air supplied in the end funnel 26, as seen in the direction of movement of the fleece belt 18, is brought to the end of the end funnel 26 and exits distributed over its cross section. The air duct in the end funnel 26 is advantageously designed in such a way that the air flowing through is provided with a swirl. As a result, a suction arises in the pre-funnel 25 on the one hand, which supports the movement of the fleece strip 18 and, on the other hand, the twist ensures that the fleece strip 18 is slightly twisted and thus becomes more compact. The end funnel 26 can, as shown, be extended by a cylindrical extension between the upper and lower pressure rollers 27 and 28, so that the fleece tape 18 is guided as close as possible to the nipping point of the pressure roller pair.

Die vorliegende Erfindung ist nicht auf die dargestellten und beschriebenen Ausführungsbeispiele beschränkt. Abwandlungen und Kombinationen von Merkmalen im Rahmen der Patentansprüche sindThe present invention is not limited to the illustrated and described exemplary embodiments. Modifications and combinations of features are within the scope of the claims

BezugszeichenlisteList of reference symbols

  1. 1 Karde1 card
  2. 2 Füllschacht2 filling chute
  3. 3 Speisekanal3 feed channel
  4. 4 Faserflocken4 fiber flakes
  5. 5 Füllschachtaustrag5 Filling chute discharge
  6. 6 Speisewalze6 feed roller
  7. 7 Auflösewalze7 opening roller
  8. 8 Luftzuführung8 air supply
  9. 9 Ausgangswalzenpaar9 pair of exit rollers
  10. 10 Speisevorrichtung10 feed device
  11. 11 Wattenvorlage11 wadding template
  12. 12 Vorreissermodul12 licker-in module
  13. 13 Kardentrommel13 card drum
  14. 14 Deckelaggregat14 lid unit
  15. 15 Abnehmer15 customers
  16. 16 Bandbildungseinheit16 banding unit
  17. 17 Faservlies17 fiber fleece
  18. 18 Vliesband18 fleece tape
  19. 19 Kardenband19 card sliver
  20. 20 Querband20 cross band
  21. 21 Vliesbandführer21 fleece belt guide
  22. 22 Begrenzungsprofil22 Boundary Profile
  23. 23 Bewegungsrichtung Faservlies und Vliesband23 Direction of movement of fiber fleece and fleece tape
  24. 24 Führungstrichter24 guide funnels
  25. 25 Vortrichter25 pre-funnels
  26. 26 Endtrichter26 end funnel
  27. 27 Obere Druckwalze27 Upper platen
  28. 28 Untere Druckwalze28 Lower platen
  29. 29 Bewegungsrichtung Querband29 Direction of movement of the cross belt
  30. 30 Druckluftzuführung zu Vortrichter30 Compressed air supply to pre-funnel
  31. 31 Druckluftzuführung zu Endtrichter31 Compressed air supply to the end funnel

Claims (8)

  1. A device for guiding a fleece strip (18) in a sliver-forming unit (16) of a carding machine (1) having a guide funnel (24), with an end funnel (26) and with a pair of pressure rollers consisting of an upper pressure roller (27) and a lower pressure roller (28), wherein the guide funnel (24) is arranged upstream from the end funnel (26), and the end funnel (26) is arranged upstream from the pair of pressure rollers (27, 28), and the end funnel has a compressed air feed (31), whereby a pre-funnel (25) is provided between the guide funnel (24) and the end funnel (26), characterized in that the distance between the upper pressure roller (27) and a lower pressure roller (28) is adjustable and that the end funnel (26) is designed with double walls for the feed of compressed air.
  2. The device according to claim 1, characterized in that the pre-funnel (25) is provided with a compressed air feed (30) and is designed with double walls.
  3. The device according to claim 2, characterized in that control of the compressed air connection (30) to the pre-funnel (25) is linked to the adjustment of the distance between the upper pressure roller (27) and the lower pressure roller (28).
  4. The device according to any one of claims 2 or 3, characterized in that the compressed air supply (30) to the pre-funnel (25) is opened in startup operation.
  5. The device according to claim 4, characterized in that the pressure rollers are set at a maximum distance during at least a first portion of the time of opening of the air supply (30) to the pre-funnel (25).
  6. A sliver-forming unit (16) for a carding machine (1) having a device for guiding a fleece strip (18) according to any one of the preceding claims, characterized in that the sliver-forming unit (16) is provided with two transverse belts (20) for consolidation of a fiber fleece (17).
  7. The sliver-forming unit (16) according to claim 6, characterized in that fleece strip guides (21) are provided between the transverse belts (20).
  8. A carding machine (1) having a sliver-forming unit (16) according to any one of claims 6 or 7.
EP19160975.9A 2018-03-21 2019-03-06 Sliver forming unit of a card Active EP3543385B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH00373/18A CH714817A1 (en) 2018-03-21 2018-03-21 Device for guiding a fleece band in a band forming unit of a carding machine.

Publications (2)

Publication Number Publication Date
EP3543385A1 EP3543385A1 (en) 2019-09-25
EP3543385B1 true EP3543385B1 (en) 2021-05-12

Family

ID=65717863

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19160975.9A Active EP3543385B1 (en) 2018-03-21 2019-03-06 Sliver forming unit of a card

Country Status (3)

Country Link
EP (1) EP3543385B1 (en)
CN (1) CN110295419B (en)
CH (1) CH714817A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021114783A1 (en) 2021-06-09 2022-12-15 Trützschler GmbH & Co Kommanditgesellschaft card

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3327574C1 (en) * 1983-07-30 1984-11-29 Trützschler GmbH & Co KG, 4050 Mönchengladbach Device on a card for combining a pile of fibers emerging from a carding machine to form a sliver
DE3722771C1 (en) * 1987-07-09 1989-02-02 Hollingsworth Gmbh Device for bringing together a textile nonwoven fabric into a sliver
US5155879A (en) * 1989-08-07 1992-10-20 Trutzschler Gmbh & Co. Kg Apparatus for automatically starting formation of sliver from a carded web
DE4025854A1 (en) * 1990-05-26 1992-02-20 Truetzschler & Co DEVICE FOR AUTOMATICALLY TAPING A FIBER PAPER TO A FIBER STRAP, e.g. ON A CARD
DE4017064A1 (en) * 1989-08-07 1991-02-14 Truetzschler & Co Card web and sliver splicing
EP0736619B1 (en) * 1995-04-07 1998-05-06 Rieter Ingolstadt Spinnereimaschinenbau AG Method and device for inserting sliver to the nip of calander discs
IT1281339B1 (en) * 1995-11-27 1998-02-18 Marzoli & C Spa TEXTILE MACHINE IN WHICH THE POSITION OF THE IRONING GROUP IS ADJUSTABLE WITH RESPECT TO THE DOFFER IN ORDER TO UNIFORM THE QUALITY OF THE PRODUCT
DE10145733B4 (en) * 2000-10-19 2017-02-16 Trützschler GmbH & Co Kommanditgesellschaft Device on a card or carding machine to form a fiber structure
DE102005006273A1 (en) * 2004-04-21 2005-11-10 Trützschler GmbH & Co KG Apparatus for solidifying a recoverable fibrous web, z. As cotton, chemical fibers o. The like.
DE102015114816A1 (en) * 2015-09-04 2017-03-09 TRüTZSCHLER GMBH & CO. KG Device for depositing a sliver in a jug
DE102015117154A1 (en) * 2015-10-08 2017-04-13 Trützschler GmbH & Co Kommanditgesellschaft Card with a piecing device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
CN110295419A (en) 2019-10-01
EP3543385A1 (en) 2019-09-25
CH714817A1 (en) 2019-09-30
CN110295419B (en) 2022-08-30

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