EP2356915A1 - Device for simultaneous production of at least two fibrous webs for the production of filter rods for the tobacco industry - Google Patents

Abstract

The device has a pre-separation device which partially separates a current from fibers connected with each other. Two separation devices connect downstream the pre-separation device to emit a current or a partial current of the pre-separated fibers in a suction nozzle. Two suction cable conveyors are connected downstream the separation devices. An independent claim is also included for a method for simultaneous manufacturing of two non-woven fabrics for the manufacturing of filter rods of the tobacco processing industry.

Description

The invention relates to a device for the simultaneous production of at least two fiber webs for the production of filter rods of the tobacco processing industry and a corresponding method for simultaneously producing at least two nonwoven fabrics for the production of filter rods of the tobacco processing industry.

Out EP 1 464 241 A1 For example, there is known a method for producing a nonwoven fabric for the manufacture of filters of the tobacco processing industry, and a filter strand production device. In this case, isolated filter material is conveyed to a fluidized bed and conveyed by means of a transport air flow in the direction of a strand-building device to be aufauert on the strand-building device. The strand building device comprises a suction belt conveyor. Subsequently, the formed fiber strand is conveyed in a formatting device and formed there, for example, to a round fiber strand, wrapped with a wrapping material, to be cut to length, so that filter rods of multiple use length can be provided.

A special separating device is associated with the Fig. 20 and 22 described. This is a card which in particular has three successive rollers which are designed to rotate faster and faster in the conveying direction.

Out DE 10 2006 018 102 A1 is also a corresponding card known that emits isolated filter material directly into a suction shaft. It is also a variant provided in which the isolated filter material is discharged into two suction wells or the suction shaft is divided into two sub-shafts. Here too, a suction belt conveyor closes or, in the case of the two shafts or two partial shafts, two suction belt conveyors join, by means of which one or two filter strands can be produced.

Out EP 1 913 823 A1 For example, a device and a method for the preparation of filter material for cigarette filters or the like are known, in which a strip of filter material is prepared and subsequently cut into strips of defined length. In particular, this device is suitable for cutting cellulose acetate powders or cellulose acetate fibers.

It is an object of the present invention to provide an efficient production of fiber webs for the production of filter rods of the tobacco processing industry.

This object is achieved by a device for the simultaneous production of at least two fiber webs for the production of filter rods of the tobacco processing industry, wherein a Vorvereinzelungsvorrichtung is provided which at least partially separated a stream of at least partially interconnected fibers from each other, so that a stream vorvereinzelter Fibers, which are followed by downstream of the pre-separating at least two separating devices, which are each provided to substantially completely separate a stream or a partial stream of vorvereinzelten fibers and deliver directly into at least one suction shaft, downstream of the separating device connect at least two Saugstrangförderer ,

By providing two separating devices which deliver the separated fibers directly into a suction chute, in particular preferably in each case into a suction chute, which is followed by at least one suction strand conveyor, at least two non-woven fabrics can be produced very quickly and with high throughput and efficiently for the production of Filter rods of the tobacco processing industry are produced simultaneously.

The stream of at least partially bonded fibers may be a cellulose acetate tow removed, for example, from a bale, and preferably processed prior to pre-singulation by, for example, stretching, spraying, for example, with water and / or deionization.

The pre-separating device may, for example, comprise or be a cutting device. This is in particular to the cutting device of the EP 1 913 823 A1 to think with the Reference numeral 28 is provided there.

During the processing of the filter material strip or of the fibers which are at least partially interconnected, for example, the strip of filter material is drawn off from a bale by means of a pair of rollers and introduced into a tension stand to form a strip bundle. The strip bundle is drawn in by a cutting head at a speed slightly faster than the peeling speed. Here, a crimping or crimping is pulled out by wetting the strip bundle by means of a nozzle. For example, water is applied to the strip bundle with the nozzle. Before moistening, the strip bundle is spread by means of a nozzle within a stretching zone so that the entire surface of the strip bundle can be wetted.

Immediately prior to entering the cutter, the air around the strip bundle is ionized to electrically discharge the strip bundle. The strip bundle continuously drawn by the cutting device and the withdrawal device is wound ever further around the cutting head of the cutting device. An oblique pressure ring promotes the wound layers of the strip bundle in the cutting head down into a cutting channel. In the bottom or in the bottom of the cutting channel are the upside down knife with their cutting edge. The pressure ring presses the lower layers of the wound-up strip bundle at its lowest position by the vertically upward-standing knives, so that an inevitable comminution of the strip bundle into individual strip sections takes place. This results in fibers of finite length.

The cut strip sections fall behind by the knives down in a funnel. From the bottom of the funnel, the cut strip sections, which all preferably have the same length due to the selected knife spacing and the previous uncrimping, are fed to further processing or to a staple fiber filter process.

Accordingly, the supply preferably takes place to the separating device by means of an air flow. A corresponding cutting device serving as a pre-separating device is also disclosed, for example, in Research Disclosure, October 2008, No. 534028, pages 868 and 869.

Preferably, the separated fibers are thrown directly into the suction shaft through the separating device, preferably against gravity.

Preferably, between the pre-separating device and the separating devices, the pre-separated fibers are conveyed by means of an air flow. Preferably, at least one shaft is provided in front of the singulating devices downstream of the pre-separating device. This allows you to work very lossless.

Preferably, at least two pre-separating devices are provided, wherein each separating device is respectively preceded by at least one pre-separating device. In this case, fiber webs of finite length mixed fibers can be produced very efficiently. For example, fibers of different lengths can be shuffled so efficiently into a nonwoven fabric, or different types of fibers, such as binder fibers and filler fibers, can be processed accordingly.

Preferably, a suction air opening is provided in a downstream region of each duct before each separating device, in order in particular to separate the conveying air from the fibers. For this example, serve screen surfaces.

If preferably a suction line adjoins the suction air opening, the quantity supply of fibers can be controlled or regulated very efficiently.

Preferably, a pressure sensor is provided in each shaft, by means of which an efficient control or regulation of the amount of conveyed pre-separated fibers is possible.

Preferably, the suction line is returned to the shaft. The return of the suction line into the shaft is then expediently located upstream of the suction air opening, wherein upstream relative to the conveying direction of the pre-separated fibers is to be understood in the shaft.

This can result in an air circulation, by means of which an automatic quantity control of the fibers or quantity control of the fibers is possible, in particular in the case where a pre-separating device provides the pre-separated fibers and if this stream of pre-separated fibers into two sub-streams, each be divided into a shaft.

Preferably, a control or regulating device is provided for controlling or regulating the amount of fibers conveyed and pre-separated in a partial flow. Preferably, the control or regulating device also serves to control or regulate the amount of fibers conveyed and singulated in a stream.

The pre-separating device is preferably a milling drum and / or a hammer mill and / or a fiber mill and / or a racket roller and / or a cutting device.

A hammer mill, for example, with reference to the Fig. 2 in EP 1 464 241 A1 and stated in the description. A milling drum is provided in the same document with the reference numeral 207. A racket roller is, for example, a roller provided with the reference numeral 37 in this document. A fiber mill may, within the scope of the invention, the cutting device 18 according to the EP 1 913 823 A1 be. However, other cutting devices may be provided accordingly.

The separating device is in particular preferably a card.

A card is for example in DE 10 2006 018 102 A1 described. These are in particular at least two conveyor rollers which are driven at different peripheral speeds. In particular, the downstream in the conveying direction roller is driven faster than the upstream roller. In particular, the carding machine preferably comprises three conveyor rollers, wherein the roller speeds are increasing from roller to roller in the conveying direction. The rollers themselves can be equipped, for example, with a sawtooth or Trapezzahngarnitur. Preferably, the last conveying roller in the conveying direction is designed such that it hurls the conveyed fibers against gravity directly into a suction shaft. The suction shaft is then immediately followed by a suction belt conveyor. The respective suction shaft, which covers each of the two separating devices, especially cards, is vertically aligned and completed with one or two Saugstrangförderern. As a result, a very compact device is possible. For the functionality of the card, particular reference is made to paragraphs [0034] to [0036] of FIG DE 10 2006 018 102 A1 directed.

In the upper part of the suction ducts, the Saugstrangförderer are provided.

At the Saugstrangförderer preferably followed by a conventional strand forming device, which, for example, in the EP 1 464 241 A1 and there especially in Fig. 10 and the associated description of the figures, wherein in the context of the invention at least two strand forming devices are provided which form at least two parallel filter strands.

After production of the fiber cake on the suction belt of the respective Saugstrangförderer the fiber cake is fed to a formatting device to produce from the forming fibers from the fiber cake or nonwoven fabric formed a fiber strand with desired cross-sectional geometry and optionally with a wrapping material to wrap around and then cut into filter rods to become.

Preferably, a Granulatzuführvorrichtung is provided for each suction shaft. The term granules also powder is understood. In particular, the granules or powder serves to enhance the smoke-absorbing or adsorbing properties of the filter. The granules can also serve to release flavoring substances in the filter when smoking a cigarette.

Preferably, the granule feeding device comprises a granule accelerating device accelerates the granules in the direction of the respective Saugstrangförderers and emits in the respective suction shaft.

Granules can preferably be fed from a common supply to the granule feed devices.

For this purpose, for example, a branch to the respective Granulatzuführvorrichtungen be provided in a corresponding feed line. The metering can be done, for example, with a metering roller or via compressed air or suction air. Preferably, a single metering device is provided for the Granulatzuführvorrichtungen. In this case, the branch to the Granulatzuführvorrichtungen downstream of the single metering device is provided.

In particular, it is preferred if the separating devices are arranged vertically one above the other or in the conveying direction of the suction-strand conveyor one behind the other.

• Vorsehen wenigstens eines Stroms vorvereinzelter Fasern,
• Fördern des wenigstens einen Stroms vorvereinzelter Fasern zu wenigstens zwei Vereinzelungsvorrichtungen, die die Fasern vereinzelt und beschleunigt in jeweils wenigstens einen Saugschacht abgeben,
• Aufschauern der Fasern auf wenigstens zwei Saugstrangförderern.

The object is further achieved by a method for the simultaneous production of filter rods of the tobacco-processing industry, in particular using a device according to the invention with the following method steps:

• Providing at least one stream of pre-separated fibers,
• Conveying the at least one stream of pre-separated fibers to at least two separating devices which deliver the fibers singly and accelerated into in each case at least one suction shaft,
• Shaking the fibers on at least two Saugstrangförderern.

The scattered delivery of the fibers into the respective suction chute preferably takes place counter to the force of gravity.

Preferably, a single stream of pre-separated fibers is divided into two sub-streams, with one sub-stream each being fed to a separating device. The feeding takes place here preferably with compressed air or with suction air. Preferably, a quantity control or regulation of the fiber quantity of the partial streams and / or of the stream takes place. Preferably, the quantity control or regulation via a mechanical closure element and / or via a control or regulation of the pressure in the conveyor wells in the conveying direction before the respective separating device.

Preferably, the quantity control or regulation is done automatically. This is preferably done by forming a fiber fleece or a stacked fiber cake by supplying fibers to the separating device, the at least partially closes an air discharge from a corresponding height or thickness, the thicker or the higher the fiber cake is, the more Cross-section is covered by the exhaust port closed. As a result, a smaller air flow is guided through this shaft, so that less fibers are supplied compared to the adjacent shaft. The two shafts are then also connected accordingly and are provided by appropriate branches of a main shaft or by a division into two shafts of a main shaft. In this way, an automatic quantity control or regulation happens. This is however in connection with the figures explained in more detail.

Fig. 1

einen schematischen erfindungsgemäßen Verfahrensablauf zur Herstellung von Filterstäben,

Fig. 2

eine schematisch dargestellte erfindungsgemäße Vorrichtung,

Fig. 3

eine weitere schematisch dargestellte erfindungsgemäße Vorrichtung,

Fig. 4

einen schematischen erfindungsgemäßen Verfahrensablauf zur Herstellung von Filterstäben,

Fig. 5

eine schematische Darstellung einer erfindungsgemäßen Vorrichtung,

Fig. 6

einen schematischen erfindungsgemäßen Verfahrensablauf zur Herstellung von Filterstäben,

Fig. 7

eine weitere schematisch dargestellte erfindungsgemäße Vorrichtung,

Fig. 8

eine weitere schematisch dargestellte erfindungsgemäße Vorrichtung,

Fig. 9

einen schematisch dargestellten erfindungsgemäßen Verfahrensablauf zur Herstellung von Filterstäben,

Fig. 10

eine schematisch dargestellte erfindungsgemäße Vorrichtung,

Fig. 11

einen weiteren schematisch dargestellten erfindungsgemäßen Verfahrensablauf,

Fig. 12

eine weitere schematisch dargestellte erfindungsgemäße Vorrichtung,

Fig. 13

eine weitere schematisch dargestellte erfindungsgemäße Vorrichtung,

Fig. 14

einen weiteren schematisch dargestellten erfindungsgemäßen Verfahrensablauf,

Fig. 15

eine weitere schematische Darstellung einer erfindungsgemäßen Vorrichtung,

Fig. 16

eine weitere schematische Darstellung einer erfindungsgemäßen Vorrichtung,

Fig. 17

eine weitere schematische Darstellung eines erfindungsgemäßen Verfahrensablaufs,

Fig. 18

eine weitere schematische Darstellung einer erfindungsgemäßen Vorrichtung,

Fig. 19

eine weitere schematische Darstellung einer erfindungsgemäßen Vorrichtung,

Fig. 20

einen Ausschnitt aus einer erfindungsgemäßen Vorrichtung in schematischer Darstellung zur Verdeutlichung der Mengensteuerung oder -regelung,

Fig. 21

eine schematische Darstellung eines Teils einer erfindungsgemäßen Vorrichtung,

Fig. 22

eine schematische Darstellung eines Teils einer erfindungsgemäßen Vorrichtung,

Fig. 23

eine schematische Darstellung einer Vorrichtung zur Herstellung eines Vlieses für die Herstellung von Filterstäben und

Fig. 24

einen Ausschnitt aus einer erfindungsgemäßen Vorrichtung in schematischer dreidimensionaler Darstellung.

The invention will be described below without limiting the general inventive idea by means of embodiments with reference to the drawings, reference being expressly made to the drawings with respect to all in the text unspecified details of the invention. Show it:

Fig. 1

a schematic process sequence according to the invention for the production of filter rods,

Fig. 2

a schematically illustrated device according to the invention,

Fig. 3

a further schematically illustrated device according to the invention,

Fig. 4

a schematic process sequence according to the invention for the production of filter rods,

Fig. 5

a schematic representation of a device according to the invention,

Fig. 6

a schematic process sequence according to the invention for the production of filter rods,

Fig. 7

a further schematically illustrated device according to the invention,

Fig. 8

a further schematically illustrated device according to the invention,

Fig. 9

a schematically illustrated process sequence according to the invention for the production of filter rods,

Fig. 10

a schematically illustrated device according to the invention,

Fig. 11

a further schematically illustrated process sequence according to the invention,

Fig. 12

a further schematically illustrated device according to the invention,

Fig. 13

a further schematically illustrated device according to the invention,

Fig. 14

a further schematically illustrated process sequence according to the invention,

Fig. 15

a further schematic representation of a device according to the invention,

Fig. 16

a further schematic representation of a device according to the invention,

Fig. 17

a further schematic representation of a method sequence according to the invention,

Fig. 18

a further schematic representation of a device according to the invention,

Fig. 19

a further schematic representation of a device according to the invention,

Fig. 20

a section of a device according to the invention in a schematic representation to illustrate the quantity control or regulation,

Fig. 21

a schematic representation of a part of a device according to the invention,

Fig. 22

a schematic representation of a part of a device according to the invention,

Fig. 23

a schematic representation of an apparatus for producing a nonwoven fabric for the production of filter rods and

Fig. 24

a section of a device according to the invention in a schematic three-dimensional representation.

In the drawings, the same or similar elements and / or parts are provided with the same reference numerals, so that apart from a new idea each.

Fig. 1 shows a schematic process flow of a method according to the invention of two fiber webs, are produced with the cut filter rods. The fibrous webs or the produced FHterstäbe have, for example, fibers of cellulose acetate and activated carbon granules. First, the fiber preparation for the filter tow and the process management for the filter fibers will be described.

It is a Filteracetattow at 14 and 14 'promoted accordingly, for example, deducted from a bale. This will at 15 or 15 'sprayed with water and possibly in the subsequent conveying at 14a and 14a' just before cutting or pre-singling at 16 or 16 'still discharged by ionized air. At 17, 17 ', the pre-singulated and cut fibers are metered, for example, by dispensing with a metering device or by a corresponding conveying air or a corresponding conveying air pressure. This will be described in more detail below.

At 18 and 18 ', the fibers are separated, for example, each with a card. At 19 and 19 'the separated fibers are conveyed, in particular ejected from the separating device, preferably against gravity, directly into a suction shaft. Accordingly, 20 and 20 'indicate conveying in the suction shaft. At the upper end of the suction ducts are Saugstrangförderer, on each of which a fibrous web at 21, 21 'is thrown up. At 22 and 22 ', the formed strand or web is conveyed and formed at 23 and 23' into a strand of desired cross-section. This happens in each case in a format device. Subsequently, the formed strand, which may for example also be covered with a wrapping material, is cut at 24 with a knife device, in filter rods of multiple use length. These are conveyed at 25 and handed over at 26, for example in a filter attachment machine or a multi-segment filter production machine.

Correspondingly, granules are first conveyed at 13 and 13 'in each case a granular container and at 10, 10', the granules are stored in each case. This is then further promoted to a metering device at 13a, 13a ', so that at 11, 11' the granules are dispensed metered, for example, each in a chute or conveyor shaft.

Accordingly, then the metered granules at 13b, 13b 'again conveyed to an accelerator, in which the granules at 12, 12' accelerated into the respective suction shaft 20, 20 'is discharged. For accelerating, for example, serves an accelerator roller (see DE 10 2006 018 102 A1 ).

With the method according to the invention it is possible to produce very uniform filter strands or nonwovens of filter material. In particular, the dosage is important for the uniformity of the strands. Especially the fiber dosage at 17, 17 'is important.

The FIGS. 2 and 3 show two corresponding inventive devices, with which the process according to Fig. 1 can be executed.

In Fig. 2 and Fig. 3 two sprayers 30, 30 'are respectively provided, which spray a filter acetate tow or filter tow 14, 14', which is conveyed by the sprayer, for example with water. The promotion of the filter tow happens here schematically up to the cutting device 31, 31 ', in which the filter tow can be cut into fibers according to specifiable length. To this is on the EP 1 913 823 A1 directed.

The cutting devices 31, 31 ', which may also be referred to as pre-separating devices, then discharge pre-separated fibers 57 and 57' at 17, 17 'into a shaft 32, 32' respectively, at the end of which the fibers are metered. To dose the fibers is on Fig. 2 of the EP 1 847 185 A1 and the associated description. The pre-singulated fibers typically accumulate in front of the singulation device 33 or 33 'in the Shaft 32 or 32 '. The more fibers are conveyed compared to Abfördergeschwindigkeit or Abfördermenge the separating devices, the more the corresponding fibers accumulate in the feed chute 32 or 32 '. The amount of conveyed material can now be adjusted, for example, by the delivery rate of the filter acetate screen at 14a or 14a '.

The separating devices 33 and 33 'are, for example, cards comprising three drums 34, 35, 36 and 34', 35 ', 36'. First, a feed roller, not shown, the first drum 34 and 34 'upstream. The corresponding fibers, which have arrived in the entry area of the carding machine 33 or 33 ', are picked up by the slow-running feed roller and conveyed against a trough and subsequently a leaf spring battery. The trough is spring-mounted. The result is a thin compact fiber cake, which is promoted and compressed between the feed roller and the trough and the leaf spring battery. As soon as the fiber cake is detected in the effective range of the leaf spring battery, it is detected and taken over by the high-speed roller 34 or 34 '. The rollers 34, 35, 36 and 34 ', 35', 36 'are equipped for example with Sägezahn- or Trapezzahngarnituren. The rolling speeds are from roller 34 and 34 'to the roller 36 and 36' rising towards.

After the fibers have been held for a revolution of 180 ° in the clothing of the roller 34 and 34 ', the fibers are tangentially transferred to the counter-rotating roller 35 and 35'. Since the roller 35 or 35 'rotates faster than the roller 34 or 34' and in particular has a finer Sägezahn- or Trapezzahngarnitur, there is a longitudinal alignment, parallelization and separation of the fibers in the transfer.

After the fibers in the clothing of the roller 35 or 35 'about 180 ° were held long, the fibers are transferred tangentially to the turn in opposite directions rotating roller 36 and 36 '. Since these rollers 36 and 36 'rotate faster than the rollers 35 and 35' and in particular have an even finer Sägezahn- or Trapezzahngarnitur, there is a further longitudinal alignment, parallelization and separation of the fibers in the transfer.

After the fibers have been held in the set of rollers 36 and 36 'by approximately 180 °, the fibers are tangentially upwards in an air flow in the fiber conveying direction 37, 37' in the respective suction wells 38, 38 'delivered. It is accordingly in this regard, with regard to this operation on the EP 1 464 241 A1 directed. Shortly before the Saugstrangförderern 39, 39 'granules is also thrown upwards to the fiber streams 37, 37' is added, so that in each case a mixture of fibers and granules aufschauert on the respective Saugstrangförderer 39, 39 'and forms a corresponding web. The conveying direction of the Saugstrangförderer is in this example in the Fig. 2 into the drawing sheet. In Fig. 3 the corresponding conveying directions 61, 61 'are shown by arrows.

The granules are each in granules containers 40 and 40 '. The granules are provided with the reference numerals 43, 43 '. The granules 43 and 43 'passes into a granulate meter 41, 41 which may be, for example, each a metering roller. From there passes a metered amount of granules 43 and 43 'in a chute 45, 45' to a corresponding granular accelerator 42, 42 '. This can each be an accelerator roller.

In Fig. 2 the arrangement is such that the separating device 33 and 33 'are arranged one above the other, whereas the separating device 33 and 33' in Fig. 3 in the conveying direction 61 or 61 ' the Saugstrangförderer are arranged one behind the other. Accordingly, the suction wells and the Saugstrangförderer the Fig. 2 transversely to the conveying direction 61, 61 'of the Saugstrangförderer approximately at the same height or completely at the same height, whereas these in Fig. 3 offset from each other, in the conveying direction offset from each other, are arranged.

The supply of granules happens according to Fig. 2 from two different sides and according to Fig. 3 from one side. The feed from one side works in Fig. 3 because the suction chute 38 'ends before the suction chute 38 starts, seen in the conveying direction 61 and 61', respectively. The Granulatzuführungen and also the supply of the fibers is done over the entire length of the respective suction shaft to allow a uniform and homogeneous as possible web formation.

Fig. 4 shows a simplified process control in a schematic representation. Simplifications have been made in the promotion of the filter tow and the processing of the filter tow compared to Fig. 1 , It is namely promoted filter tow at 14 and sprayed at 15, for example, with water to be further promoted to cut or Vorvereinzeln the Tows at 16. This happens only with one device. After pre-singling, a division of the singulated fiber stream into two sub-streams is carried out at 27. These are conveyed at 17 and 17 'to a separating device and metered to make at 18 and 18' according to a separation of the fibers. The next steps correspond to those from Fig. 1 ,

In particular, the division of the fibers into partial fiber streams at 27 and the associated dosage to the respective separating devices, in each case two or more uniform fiber strands or to produce filter strands is of particular interest. In particular, the comments on the FIGS. 20 to 22 directed.

Fig. 5 shows a schematic device according to the invention, which is adapted to the process control according to Fig. 4 perform. This device according to the invention essentially corresponds to the device according to the invention Fig. 2 but only one spraying device 30 and one cutting device 31 are used. The stream of pre-separated fibers 57 is then split into two sub-streams of pre-separated fibers 58 and 58 ', at 27.

In Fig. 6 a further process control according to the invention is shown in a schematic representation. Here, too, a further simplification takes place in that compared to Fig. 4 the division into partial streams, but this time of individual fibers takes place behind a single separating device. Thus, a metered fiber stream is separated at 18 and split accordingly into two partial streams 19 and 19 'at 27. These partial flows are then conveyed in a suction shaft at 20 or 20 'and, moreover, granulate is also introduced into the suction ducts at 20 or 20' and conveyed there accordingly into the suction ducts. The division into partial flows can be done in front of the suction ducts or in the suction ducts.

Corresponding devices that can realize this process according to the invention are shown schematically in the FIGS. 7 and 8 shown. A single spraying device 30, a single cutting device 31 or pre-separating device and a single separating device 33 are provided. The separated from the singulator fibers are at 37 and 37 'in accordance with two suction wells 38 and 38' promoted. This can for example be done as in Fig. 4 of the DE 10 2006 018 102 A1 , So in such a way that in the region of the discharge roller or discharge drum 36 two with a small angle mutually oriented suction shafts are provided or a suction shaft as in accordance with Fig. 3 of the DE 10 2006 018 102 A1 is provided, which divides shortly before the Saugstrangförderer 39 and 39 'in two suction wells. Unlike the execution of DE 10 2006 018 102 A1 However, two separate Granulatzuführungen are provided, for each suction shaft 38 and 38 'one.

In Fig. 7 the suction ducts and the Saugstrangförderer are arranged side by side in the conveying direction of the Saugstrangförderer or transversely to the conveying direction of the Saugstrangförderer one behind the other.

In Fig. 8 a slightly different embodiment is chosen. Here is a separation of vorvereinzelten fiber streams into two streams 58 and 58 'in a separation shaft 44 instead. The separation shaft 44 may be designed so that in the middle of a wall is provided. This is for example in Fig. 24 with respect to the separation shaft 44 shown. There it can be seen that the separating shaft 44 is separated by a middle wall 56. It can then be like in Fig. 24 shown, two separating devices may be provided side by side or as in Fig. 8 only a separating device 33, which extends over the entire depth of the fiber conveyor 37 and 37 '. This is therefore a very deep-building separation device with very elongated rollers 34 to 36.

In Fig. 8 can also be seen that the suction wells 38 and 38 'in the conveying direction 61 and 61' of the suction belt conveyors 39 and 39 'are arranged one behind the other, in such a way that they are transverse to the conveying direction do not overlap. The filling with granules takes place from one side.

Fig. 9 shows a further simplified procedure of a method according to the invention, wherein compared to Fig. 6 no division of individual fiber streams before a suction shaft or before conveying takes place in the suction shaft, but only a division or forming part streams at 29 in the suction shaft or shortly before the Saugstrangförderern. In the variant of dividing or forming the partial streams in the suction shaft is first conveyed at 20 in the suction shaft and then at 20a and 20a 'partial flows promoted. Alternatively, the partial flows can be formed directly in front of the suction shaft.

An apparatus option to make this looks like that a single suction shaft 38 is provided, at the top of which two suction belt conveyors 39 and 39 'connect. The Granulatzuführung happens from both sides of the suction shaft just before the Saugstrangförderern 39 and 39 '. A corresponding device according to the invention is shown schematically in FIG Fig. 10 shown.

In Fig. 11 a further process control according to the invention is shown in a schematic representation. In this case, the fibers are processed as in Fig. 1 , In fact, there is a simplification or standardization of the granule feed, such that the storage of the granulate takes place in a single container and from this container 28 two partial streams of granules are delivered. These then pass through the conveyor 13 and 13 'to the step of dosing the granules at 11 and 11'. Otherwise, the procedure corresponds to the Fig. 1 ,

Apparativ can be this invention, as in the FIGS. 12 and 13 shown, solve.

An apparatus solution according to Fig. 12 looks like that the separating devices are arranged one above the other. It is then provided a common granules in a granule container 40. Granules 43 are fed via two granulate feeders 41 and 41 'into chutes 45 and 45' to the granulate accelerators 42 and 42 ', which introduce the granules 43, 43' from two different sides into the respective suction chutes 38 and 38 'respectively.

Another variant is provided in an embodiment in which the separating devices are arranged one behind the other in the conveying direction of the suction belt conveyor. The granule container 40 is arranged on one side of the Saugstrangförderer. This extends relatively low over two suction chute lengths, so that granulate is fed via the granulate dosing device 41 via the chute 45 to the adjoining acceleration device and into the in Fig. 13 front suction shaft 38 'is discharged. Correspondingly, 40 granules are fed from the same container via the granulate meter 41 to the chute 45 to the adjoining granulate accelerator and from there into the suction chute 38.

Fig. 14 shows a further standardization of Granulatzuführung compared to Fig. 11 , Here also takes place a common granule dosing at 11 and then a formation of partial streams at 28, so that only the granulate acceleration at 12 or 12 'is done separately from each other. Corresponding devices according to the invention for this purpose are shown schematically in FIG FIGS. 15 and 16 shown. Here it can be seen that granules 43 from the container 40 via a metering device 41 into corresponding chutes 45 and 45 'is discharged and centrifuged by separate granular accelerators 42 and 42' in the suction wells. This happens according to Fig. 15 from two different sides and according to Fig. 16 from one side at the respective suction shafts.

In Fig. 15 an embodiment is shown in which the separating devices 33 and 33 'are arranged one above the other and at Fig. 16 in the conveying direction of the Saugstrangförderer one behind the other.

Fig. 17 shows a particularly preferred embodiment of a process control in a schematic representation. It is a combination of process management Fig. 11 and Fig. 4 , Namely, in the fiber preparation, the tow is uniformly sprayed and cut or singulated, to then form fiber streams at 27, metered at 17 and 17 'for singulation at 18 and 18'. Accordingly, granules are stored in a common supply at 10 and promoted at 28 in partial streams for metering at 11 and 11 '. This procedure is technically the most efficient process management for single-brand operation.

In Fig. 18 a particularly preferred device according to the invention is shown schematically. According to Fig. 18 a filter tow is first conveyed at 14 and sprayed in the Sprühvorrichtung 30 with water. Subsequently, the filter tow is cut into fibers of finite length with the cutting device 31 and pre-separated into a stream 57 of pre-separated fibers and divided into corresponding partial streams 58 and 58 '. These are fed into the shafts 32 and 32 'and the corresponding separating devices 33 and 33'. The separating devices 33 and 33 'are arranged one above the other, and so far one above the other, that above the separating device 33 'there is still room for a granulate reservoir 40' together with granulate feeders, a chute 45 'and a granulate accelerator 42'.

Alternatively, the separating devices can also be arranged one behind the other in the conveying direction of the suction-strand conveyors 39 and 39 ', so that the device can not be designed to be so tall. The supply of granules takes place in each case from one side to the respective suction wells 38 and 38 '. Accordingly, the feeder can also be made from two sides according to Fig. 19 happen.

The splitting of the fiber streams of pre-separated fibers into partial streams 58 and 58 'takes place at 27. For this purpose, according to Fig. 21 first a lock 50 may be provided and then a mechanical flap 53, which closes the shaft 32 or the shaft 32 'terminates, which is schematically indicated by the double arrow.

In the embodiment according to Fig. 21 the shaft 32 is closed and the shaft 32 'for a fiber stream 49' open, so that correspondingly the fibers are conveyed into the shaft 32 '. This is preferably done with conveying air or an air flow 47 ', which is formed by an air circuit. For this purpose, a fan 54 'or in for the in Fig. 21 This sucks air from the lower region of the shaft 32 'or 32 through a sieve 48' or 48, by means of which the fibers are separated from the air flow.

As in Fig. 21 is indicated, a first level of fibers 51 is present. In the left-hand bay 32, a second filling level 52 of fibers is provided in front of the separating device 33, that is, one larger level. For this reason, in Fig. 21 Fibers in the right shaft 32 'promoted. A corresponding control signal can be fed via pressure sensors 55 or 55 'to the control or regulating device 60 and serves correspondingly to control the mechanical flap 53. There is a high pressure at the pressure sensor 55' compared to the pressure at the pressure sensor 55 This means that a higher filling in the shaft 32 'predominates than in the shaft 32. In this case, the flap 53 is actuated to the right in Fig. 21 to be folded, so that the shaft 32 'is closed and are conveyed according to fibers in the shaft 32. The electrical signal lines are shown in dashed lines in this embodiment.

The flap can also close the shafts only partially, so that a different amount of fibers can get into the shafts. In addition, a mechanical flap or a mechanical slide may be provided for each shaft, each of which completely or partially close or completely open the shaft.

In Fig. 20 is again on an enlarged scale a part of the Fig. 21 shown. Here, the first level 51 and the second level 52 are shown particularly well. The higher the level, the less air can freely pass through the screen 48, so that a corresponding backflow of compressed air or suction air is formed in the shaft 32, which can also be measured by a corresponding pressure sensor.

In the schematic embodiment of Fig. 22 No air circulation is used, but it is discharged according to compressed air or suction air 47 and 47 'in each case an air flow. This can be used to automatically without mechanical flap Control or regulation of the fiber streams 49 and 49 'provide. The height of the filling level in front of the corresponding separating devices 33 or 33 'of fibers in this case serves for automatic regulation or control. The more fibers obscure the respective sieve, the greater the level in a shaft, the fewer fibers are directed into the corresponding shaft, since there builds up a corresponding back pressure in front of the sieve. It is thus passed a corresponding air flow with a larger amount of fibers in the shaft, the Luftabförderung on the respective sieves 48 and 48 'is the most unhindered.

A device that complies with the procedure according to Fig. 17 most suitable, would be a modification of the schematically illustrated device Fig. 19 in which a common supply of granules is provided by a single container. This can be a common container as in Fig. 15 in Vereinzeiungsvorrichtungen arranged one above the other or as at Fig. 16 at separating devices, which are arranged one behind the other in the conveying direction of the suction belt conveyor.

Fig. 23 shows a variant of the supply of Filtertow. There are two filter towows at 14 and 14 'promoted accordingly and sprayed in the Sprühvorrichtung 30 with water. These are then cut together in the cutting device 31, so that a stream of pre-separated fibers of different grades is conveyed at 57 into a separation shaft 44. It can then be a separating device, as in Fig. 22 , be provided or two separating devices, as in Fig. 24 is indicated. In Fig. 23 only one separating device is shown. However, two separating devices are preferred in the embodiment of the Fig. 23 like this in Fig. 24 is provided.

A division of the stream 57 vorvereinzelter fibers into streams 58 and 58 'then happens through a center wall 56 in the separation shaft 44, which consists of two shafts 32, 32', which are separated by the middle wall 56 from each other. As a result, the corresponding partial streams 58 or 58 'of pre-separated fibers are then fed to the separating devices 33 and 33', which convey the separated fibers correspondingly into suction ducts 37 and 37 '(not shown). This can then, for example, as in Fig. 16 be.

Instead of pre-singulation by cutting a filter tow and conveying the cut finite fibers, pre-singulation may also be provided by dissolving inter-partially entangled or otherwise joined finite fibers.

All mentioned features, including the drawings alone to be taken as well as individual features that are disclosed in combination with other features are considered alone and in combination as essential to the invention. Embodiments of the invention may be accomplished by individual features or a combination of several features.

Bezuaszeichenliste

10, 10 '

Store granules

11, 11 '

Dose granules

12, 12 '

Accelerate granules

13, 13 '

advancement

13a, 13a '

advancement

13b, 13b '

advancement

14, 14 '

Promotion of filter tow

14a, 14a '

Promotion of filter tow

15, 15 '

Spray tow

16, 16 '

Cut / pre-sing tow

17, 17 '

Dosing fibers

18, 18 '

Isolate fibers

19, 19 '

Promote fibers

20, 20 '

Conveying in suction shaft

20a, 20a '

Conveying in suction shaft

21, 21 '

Shuddering in Saugstrangförderer

22, 22 '

Promoting the formed strand

23, 23 '

extrusion molding

24

Cutting with knife

25

Conveying filter rods

26

Transfer of filter rods

27

Forming partial flows

28

Forming partial flows

29

Forming partial flows

30, 30 '

Besprühvorrichtung

31, 31 '

cutter

32, 32 '

shaft

33, 33 '

separating device

34, 34 '

roller

35, 35 '

roller

36, 36 '

roller

37, 37 '

fiber promotion

38, 38 '

suction well

39, 39 '

suction rod

40, 40 '

granule units

41, 41 '

Granulatdosierer

42, 42 '

granulate accelerator

43, 43 '

granules

44

separator Drawer

45, 45 '

chute

46, 46 '

branch shaft

47, 47 '

airflow

48, 48 '

scree

49, 49 '

fiber stream

50

lock

51

1st level

52

2nd level

53

flap

54, 54 '

fan

55, 55 '

pressure sensor

56

center wall

57, 57 '

Stream of pre-separated fibers

58, 58 '

Partial stream of pre-separated fibers

60

control device

61, 61 '

conveying direction

Claims (14)

Apparatus for the simultaneous production of at least two fibrous webs for the production of filter rods of the tobacco processing industry, wherein a pre-separating device (31, 31 ') is provided which at least partially separates a stream (14, 14') of at least partially interconnected fibers, such that a stream (57, 57 ') of pre-separated fibers results, to which downstream of the pre-separating device (31, 31') at least two separating devices (33, 33 ') are connected, which are each provided to generate a stream (57, 57 ') or a partial flow (58, 58') of the pre-separated fibers substantially completely separate and deliver directly into at least one suction shaft (38, 38 '), wherein downstream of the separating device (33, 33') at least connect two suction belt conveyors (39, 39 '). Device according to claim 1, characterized in that between the pre-separating device (31, 31 ') and the separating devices (33, 33') the pre-separated fibers (49, 49 ') are conveyed by means of an air flow (47, 47'), wherein in particular at least one shaft (32, 32 ') is provided downstream of the pre-separating device (31, 31') in front of the separating devices (33, 33 '), wherein in particular at least two pre-separating devices (31, 31') are provided, each separating device (33 , 33 ') in each case at least one pre-separating device (31, 31') is connected upstream. Apparatus according to claim 2, characterized in that in a downstream region of each shaft (32, 32 ') before each separating device (33, 33') a suction air opening (48, 48 ') is provided. Apparatus according to claim 3, characterized in that the suction air opening (48, 48 ') is followed by a suction line (46, 46'), wherein in particular in each shaft (32, 32 '), a pressure sensor (55, 55') is provided , Apparatus according to claim 4, characterized in that the suction line (46, 46 ') in the shaft (32, 32') is returned. Device according to one of claims 1 to 5, characterized in that a control or regulating device (60) for controlling or regulating the amount of in a partial flow (49, 49 ') promoted and pre-separated fibers provided wherein in particular the pre-separating device (31, 31 ') comprises a milling drum and / or a hammer mill and / or a fiber mill and / or a racket roller and / or a cutting device, wherein in particular the separating device (33, 33') is a carding machine. Device according to one of claims 1 to 6, characterized in that for each suction shaft (38, 38 ') a Granulatzuführvorrichtung (40, 40', 41, 41 ', 42, 42') is provided, in particular the Granulatzuführvorrichtung (40 -. 42 ') has a granule acceleration device (42, 42'), the granules (43, 43 ') in the direction of the respective Saugstrangförderers (39, 39') accelerated and in the respective suction shaft (38, 38 ') emits. Apparatus according to claim 7, characterized in that granules (43, 43 ') from a common supply (40, 40') the Granulatzuführvorrichtungen (40 - 42 ') can be supplied, in particular a single metering device (41, 41') for the Granulatzuführvorrichtung (40 - 42 ') is provided. Device according to one of claims 1 to 8, characterized in that the separating devices (33, 33 ') are arranged one above the other vertically or in the conveying direction of the suction strand conveyor (39, 39') one behind the other. A method of simultaneously producing at least two nonwoven fabrics for the manufacture of filter rods of the tobacco processing industry, in particular using a device according to one of claims 1 to 9, comprising the following method steps: Providing at least one stream (57, 57 ', 58, 58') of pre-separated fibers, Conveying the at least one stream (57-58 ') of pre-separated fibers to at least two separating devices (33, 33') which deliver the fibers singly and accelerated into in each case at least one suction shaft (38, 38 '), - Shaking the fibers on at least two Saugstrangförderern (39, 39 '). Method according to claim 10, characterized in that a single stream (57, 57 ') of pre-separated fibers is divided into two sub-streams (58, 58'), one sub-stream (58, 58 ') each of a separating device (33, 33') is supplied. A method according to claim 11, characterized in that a quantity control or regulation of the amount of fibers of the partial streams (58, 58 ') takes place. A method according to claim 12, characterized in that the quantity control or regulation via a mechanical closure element (53) and / or via a control or regulation of the pressure in the delivery wells (45, 45 ') in the conveying direction in front of the respective separating device (33, 33 ') happens. A method according to claim 13, characterized in that the quantity control or regulation is automatic.

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