EP0578955A1 - Lap package production - Google Patents

Abstract

The invention relates to a method and an apparatus for the production of a lap package (33, 65) which serves as a model for combing out on a combing machine (11), fibre slivers (2) formed in a preliminary process being fed to a package-forming machine (35). Two methods for producing the said lap packages (33, 65) are known in practice. The object of the invention is to simplify the known methods, in order to allow high productivity along with a uniform quality of the lap webs. This is achieved by means of a drafting in groups in a first drafting-frame stage (S1), a subsequent folding of the nonwovens (25, 26, 42) thereby formed, and a further drafting of the folded nonwovens in a second drafting-frame stage (S2), as well as a subsequent winding of the nonwoven dispensed by the second drafting-frame stage (S2). According to a further solution, the carded fibre slivers (2) are presented directly to the package-forming machine (35), without a further processing stage, and are drafted in groups via at least four drafting frames (46) working in parallel, before the nonwovens (47) thereby formed are folded and wound. <IMAGE>

Description

The invention relates to a method according to the preamble of patent claims 1 or 2 and to an apparatus for carrying out the method according to the preamble of patent claim 6.

For the combing process on the combing machine, cotton rolls, called coils for short, are used as a template. These windings are produced from fiber tapes essentially using two known processes.

One method is the so-called "classic method", in which the slivers formed on the card are presented to a subsequent wadding machine for further processing. The slivers are fed, for example, in two groups of twelve belts each to a drafting unit of the wadding machine, the slivers being stretched with approximately 1.5 times the draft. The nonwovens released and stretched from the drafting systems are placed on the stretched nonwovens of the second drafting system via a sweeping device. The doubled nonwoven fabric, or fleece for short, that is produced according to this summary is fed to a winding device for forming a lap.

The windings formed in this way are brought by a transport device or manually to a sweeping path, on which a plurality of windings, for example six windings, are unwound at the same time. The unrolled cotton webs each run through a drafting system, which causes the material supplied to be warped by about 6 times. The wadding webs released and drawn by the drafting systems reach a conveyor table via a sweeping device, on which all cotton sheets are laid on top of each other or doubled. The wadding web thus formed is transferred to a winding device and rolled up into a roll there.

As soon as this winding has a predetermined size, it is taken over by the transport system, which transfers the winding individually or in a winding group to the subsequent combing machine.

The high warping of the wadding webs with subsequent doubling applied to this machine results in a high cross-section doubling, as a result of which the band structure in the wadding web cross section almost completely disappears. This structure enables an optimal distribution of the clamping force of the pliers on the cotton in the subsequent combing machine. This is particularly advantageous when processing long stacks in order to provide the fibers with a sufficient retention force in the clamped state during the combing process on the combing machine. This relates in particular to the fibers which are located in the middle area of the cotton to be combed.

In the second known method, the slivers emitted by the cards are fed to a section on which they are doubled, then stretched and brought together to form a sliver. The slivers formed on the lines are presented in groups to a subsequent sliver duplicating machine. The individual groups of fiber slivers are each fed to a drafting system and subjected to a delay of approximately 1.5 times, depending on the sliver number.

The fiber slivers emitted and drawn by the drafting devices form a so-called fiber fleece, which is pressed downwards onto a sweeper Feed table is dispensed. The nonwovens released by the respective drafting system are laid one on top of the other or relined.

The doubled non-woven fabrics are transferred via calender rolls to a winding device in which one of the windings required for the combing machine is produced. As described in the first case, this winding is ejected and transferred to the combing machine individually or in groups by means of appropriate transport devices. In the machine described, a total of approximately 32 to 48 cans with slivers can be placed on the infeed table.

In contrast to the classic method described, the second method shown does not require an additional wadding machine to form an intermediate lap, which must then be presented to a sweeping section. This means that no additional transport device is required to transfer these intermediate windings from the wadding machine to the sweeping section. However, in the second method, an additional section passage is connected upstream, on the one hand to maintain the correct hook position of the fibers in the fiber sliver and on the other hand to obtain a good mixing and uniformity as well as a parallelization of the fibers of the sliver presented. This is achieved in particular through the tape doubling undertaken in the route passage.

The advantages of the second method compared to the classic method are, in particular, the high productivity due to the fewer and simpler transport tasks (can transport instead of winding transport) and thus fast throughput times. In addition, a relatively large number of cans can be presented for processing in the second method. Also the setting of With this method, reserve tapes can be carried out more easily and quickly than the application of wadding in conventional methods.

The advantages of the classic method are clearly the better cross-sectional structure of the cotton wool for the clamping process on the combing machine pliers, the cross-section of the ribbon structure being almost completely blurred.

Further information on the process stages described can be found in particular in the manual of textile production "Die Kurzstapelspinnerei - Volume 3: Combing, Stretching, Flyer" by W. Klein and in the lecture by Jochen Müller "Transport automation in cotton combing" from the 4th Reutlingen ring spinning Colloquium "Automation and high performance - ring spinning on the upswing" from 24th to 25th October 1989 in Reutlingen.

The productivity of this process has been improved based on the automated winding transport between the wadding machine and the sweeping route and on the basis of automated application processes of the wadding in the classic method, so that this method again offers an interesting alternative to the second method.

The object of the invention is now to propose a method or a device for carrying out the method which, on the one hand, enables high productivity in conjunction with a - in cross section - qualitatively homogeneous cotton.

This object is achieved by the characterizing part of the method according to claim 1, 2 or 3, or by the characterizing of the device according to claim 6 or 20.

The proposed methods and the devices for executing the methods enable the presentation of a large number of cans and the formation of a high-quality cotton cross-section as well as a process shortening and a reduced transport work of the material in connection with a high warping of the fiber slivers directly on the winding-forming machine. This is ensured in particular by the use of two consecutive drafting stages, the nonwovens formed in the first drafting stage then being doubled before they are presented to the second drafting stage. This results in a high cross-sectional duplication, whereby, as with the classic method, the band structure is blurred in the cross-section of the wadding.

The term "in groups" denotes a certain number of fiber tapes or non-woven fabrics.

An additional fleece doubling after the second drafting stage according to patent claim 1 results in an additional improvement in the wad cross section. This additional doubling is made possible by the use of at least two drafting systems connected in parallel in the second drafting stage, the material presented to the second drafting stage being divided proportionately in the form of non-woven fabrics.

The further proposed direct processing of the carded fiber slivers on the winding-forming machine, the fiber slivers being stretched in groups and then doubled, results in a process shortening compared to known methods, since at least one route passage is saved in this case.

The use of at least four drafting systems connected in parallel in the first drafting stage enables the simultaneous processing of a large number of fiber slivers, for example in accordance with subclaim 16 of at least 56 fiber slivers. A more detailed representation of the sliver and the necessary warping is described in more detail in the following exemplary embodiments.

Due to the large presentation of cans or fiber tapes made possible by the drafting system configuration, a very large amount of material is presented to the winding-forming machine for processing at the same time. The result of this is that with a constant wad mass (as is known) required for the formation of a wrap of approx. 80 g / m for an approximately 300 mm wide wadding web, the infeed speed of the slivers can be reduced on the basis of the large sliver mass and thus the risk of band breaks is reduced and thus a simple infeed table is sufficient.

In addition, the failure of one or some of the fiber tapes in the inlet leads to only a slight loss of mass of the cotton web formed. With a supply of approx. 100 cans or fiber tapes, the failure of 5 fiber tapes only leads to a mass loss of approx. 2% of the cotton web formed. (Assumption: sliver = 5 g / m; loss with 5 slivers = 80 g / m: 100 = 0.8 g / m; 0.8 g / mx 5 = 4.0 g / m => 2% of 80 g / m). This ensures that the sliver is fed continuously through the infeed table, even if the sliver briefly fails in the infeed. In this way, failed slivers can easily be replaced or reattached without the entire system having to be switched off or shut down.

As can be seen from the cited prior art, the doubling in the form of a fleece is essentially decisive for achieving a homogeneous wad cross section. It is known from the prior art, for example from US Pat. No. 3,495,304, to carry out a doubling of nonwovens which were formed on a first drafting stage before the doubled nonwovens are presented to a subsequent drafting stage. Following the second drafting stage, the nonwoven fabric formed is combined into a band and placed in a jug. The aim of this device is to achieve a uniformly mixed sliver. It is a pure mixing section. Although such mixing sections in the form shown have been known for a long time, a transfer of this device to form a cotton lap has not been considered to date.

It is further proposed to present the slivers formed on the cards, which have been stored in the intermediate storage, directly to the winding-forming machine. In relation to the known second method described above, this leads to process shortening and thus to increased productivity. With this method, however, the correct check position of the fibers is not taken into account and can affect the quality.

To take the tick position into account, it is advantageous to transfer the slivers stored on the card in the intermediate store into a second intermediate store, which are presented to the winding-forming machine. The proposed transfer process reverses the direction in which the sliver is drawn off, thus achieving the desired hook position of the fibers in the sliver. A more detailed description of the tick position is given in the following exemplary embodiments. The transfer could also be done by simply tilting the jug around 180 °, whereby the jug can be tipped into an empty jug below.

In order to save a transfer process of the fiber slivers into further intermediate stores, it is proposed to pull the fiber slivers out of the intermediate store in the conveying direction in which they were deposited on the card in this intermediate store. This could be done, for example, in accordance with the exemplary embodiment according to DE-AS 16 85 629, the intermediate stores being filled from below and the deduction taking place from above. A reversal of the principle - fill from above and pull off below - would also be conceivable if the jug was designed accordingly.

It is also possible to position the beginning of the sliver on the card so that the storage device can then be tilted with appropriate devices, so that this sliver beginning can be used as a template on the winding-forming machine.

In order to correct the tick position, it is further proposed to wind the windings produced on the winding-forming machine in a subsequent device onto another sleeve.

The desired hook position of the fibers in the sliver can also be taken into account directly when removing the fibers from the card by appropriately designing the doffing device.

As already described above, it is advantageous to add a further doubling device after the second drafting stage in order to achieve a homogeneous cross-sectional structure of the cotton. Therefore it will proposed to provide the second drafting stage with at least two drafting devices connected in parallel.

Productivity is particularly high if the first drafting stage consists of six and the second of three drafting systems connected in parallel to one another. Each drafting system, based on the corresponding drafting stage, is given the same proportion of material for processing.

The further proposals to arrange the drafting systems of the first drafting stage or the first and second drafting stages one above the other, seen in the vertical direction, result in a narrow and compact design of the machine with high productivity.

The construction height of the machine can be limited by dividing it into several adjacent groups within one drafting stage and, after the second drafting stage, enables the fiber webs formed in this way to be doubled with simultaneous cross-pulling. This means that the nonwovens released from the drafting systems of the second drafting system stage are deflected via corresponding deflection devices and pulled off transversely to the conveying direction of the drafting systems and doubled at the same time. This makes it possible to blur or compensate for periodic errors that may occur on the individual drafting systems. Such errors can occur, for example, if one of the drafting cylinders runs out of round and thereby generates a periodic error. As will be described in the following example, the adjacent groups are driven together from one side within a drafting stage. It is advantageous to achieve a uniform cotton wool in the longitudinal direction and to enable the processing of a large amount of material Train total delay between four and ten. This enables a high cross-section duplication as well as the presentation of a large number of slivers. This results in a high leveling of the cotton in the longitudinal direction as well as in the cross section.

The proposal to feed the fiber slivers formed by the card in groups to four parallel drafting systems with subsequent doubling and winding formation results in a shortening of the process and the possibility of a large can template with a high delay on the drafting systems.

In order to achieve a clear and secure fiber sliver transport in connection with an automated feed, it is proposed to assign a separate conveyor device for feeding a predetermined number of fiber slivers to each drafting unit of the first drafting unit stage.

Further advantages and features of the invention are described and shown in more detail with reference to the following exemplary embodiments.

Fig. 1

eine schematische Darstellung einer bekannten Anlage zur Wickelbildung nach dem klassischen Verfahren,

Fig. 2

eine schematische Darstellung einer bekannten Anlage zur Wickelbildung nach dem Banddoublierverfahren,

Fig. 3

eine schematische Darstellung einer Anlage zur Wickelbildung nach der Erfindung,

Fig. 4

eine weitere schematische Darstellung einer Anlage zur Wickelbildung der Erfindung mit einer Umfüllstation,

Fig. 5

eine weitere schematische Darstellung einer Anlage zur Wickelbildung nach der Erfindung,

Fig. 6

eine weitere Darstellung einer Anlage zur Wickelbildung nach der Erfingung mit einer Kannenkippstation,

Fig. 7

eine weitere schematische Darstellung einer Anlage zur Wickelbildung nach der Erfindung mit einer Bandablage an der Karde mit Kopfhäkchen,

Fig. 8

eine weitere schematische Darstellung einer Anlage zur Wickelbildung nach der Erfindung mit einer Umwickelstation,

Fig. 9

eine schematische Seitenansicht der Streckwerksstufen und anschliessender Wickelbildung gemäss der Erfindung,

Fig. 10

eine schematische Seitenansicht einer weiteren Ausführungsform der Streckwerksstufen mit anschliessender Wickelbildung,

Fig. 11

eine weitere schematische Seitenansicht der Streckwerksstufen mit zusätzlicher Doubliereinrichtung,

Fig. 12

eine Seitenansicht nach Fig. 9 mit Querabzug und Wickelbildung,

Fig. 13

eine schematische Draufsicht auf die wickelbildende Maschine gemäss Fig. 9 und 10 mit Einlauftisch,

Fig. 14

eine schematische Seitenansicht einer weiteren Ausführungsform mit einer Streckwerksstufe und anschliessender Wickelbildung.

Show it:

Fig. 1

1 shows a schematic representation of a known system for winding formation using the classic method,

Fig. 2

1 shows a schematic representation of a known system for winding formation using the tape doubling process,

Fig. 3

1 shows a schematic representation of a system for forming coils according to the invention,

Fig. 4

another schematic representation of a plant for winding formation of the invention with a decanting station,

Fig. 5

FIG. 2 shows a further schematic illustration of a system for winding formation according to the invention,

Fig. 6

1 shows a further illustration of a system for winding formation after the invention with a can tilting station,

Fig. 7

FIG. 2 shows a further schematic illustration of a system for winding formation according to the invention with a tape deposit on the card with head hooks,

Fig. 8

FIG. 2 shows a further schematic illustration of a system for winding formation according to the invention with a winding station,

Fig. 9

2 shows a schematic side view of the drafting stages and subsequent winding formation according to the invention,

Fig. 10

2 shows a schematic side view of a further embodiment of the drafting stages with subsequent winding formation,

Fig. 11

another schematic side view of the drafting steps with additional doubling device,

Fig. 12

9 with cross deduction and winding formation,

Fig. 13

9 shows a schematic plan view of the winding-forming machine according to FIGS. 9 and 10 with an infeed table,

Fig. 14

is a schematic side view of another embodiment with a drafting stage and subsequent winding formation.

Fig. 1 shows schematically a system according to the classic method for winding formation already described.

The sliver 2 formed on one of several cards 1 is deposited in a can 3, which serves as an intermediate store. The cans 3 are transported via a transport system or manually to an infeed table 4 of a wadding machine 5. The wadding machine 5 generally has two parallel infeed tables 4, on each of which 3 fiber slivers are drawn from twelve cans and fed to a drafting system. Each of these drafting systems, which are not shown in detail, processes twelve supplied fiber slivers, for example a fiber sliver can have a mass of 5 ktex. That means a drafting system processes a total mass of 60 ktex, which corresponds to 60 g / m. This mass is stretched in the respective drafting system with a 1.5-fold draft, so that the nonwoven fabric released from the respective drafting system still has a mass of 40 ktex. These two non-woven fabrics of 40 ktex each are placed on one another or doubled and then wound up in the winding device 6 to form a cotton roll 7, called a roll for short. The winding 7 now consists of a cotton web with a cotton weight of 80 g / m.

The coils 7 formed in this way are transported to a sweeping section 8, with six coils being presented for the rolling process of the sweeping section.

The wadding web unrolled from the individual windings 7 is guided over a drafting system, not shown, which executes a 6-fold delay. The nonwovens delivered from the individual drafting systems are discharged via appropriate sweeping devices onto a conveyor table, on which they are placed one on top of the other or doubled. The individual nonwoven fabrics have a mass of about 13 g / m when they exit the drafting system. After the doubling of these nonwovens, a cotton web of 80 g / m is again produced, which is conveyed to a winding device 9 to form a winding 10. The winding 10 is ejected and submitted to a subsequent comber 11 for further processing by means of suitable transport devices. The combing machine 11 has eight such coils 10 at the same time for further processing. As already described at the beginning, due to the doubling of the nonwovens at the sweeping section 8, a cross-sectional structure is achieved in the wadding web, the original band structure having been almost completely eliminated.

Fig. 2 shows a schematic representation of a system with the known tape duplication process. Here, the sliver 2 delivered by the cards 1 is temporarily stored in cans 3, which are presented in an infeed table 12 to a subsequent section 13. The route 13 is presented, for example, with eight such cans 3, from which the fiber slivers are transferred via the infeed table 12 to a drafting system (not shown in more detail). The slivers fed to the drafting system are stretched (e.g. 8-fold) and the fleece emerging from the drafting system is combined to form a sliver. This sliver is placed in a can 14 via appropriate devices.

These cans are transferred to the infeed table 15 of the belt duplicating machine 16 by means of suitable transport devices or manually. As a rule, two infeed tables 15 are arranged on this machine, for example one Inlet table twelve cans are presented. The fiber slivers drawn off from the cans 14 per infeed table 15 pass through suitable guides to a drafting system which subjects the fiber slivers to an approximately 1.5-fold warp. If one assumes that a fiber sliver has a mass of 5 ktex (5 g / m), a fiber fleece of 40 g / m each is obtained at the outlet of the two drafting devices assigned to the infeed table and not shown. These two fleeces are relined and fed to a winding device 17 to form a roll 18. As already described in the method according to FIG. 1, the coils 18 formed in the process are presented to a subsequent combing machine 11 for further processing.

Both process lines (FIGS. 1 and 2) are designed in terms of the number of individual process stages so that the fibers released by the card are present on the comber 11 with head hooks. These head hooks can then be loosened by the combing process.

FIG. 3 shows a schematic side view of a process line for forming cotton rolls by the method proposed according to the invention. In contrast to the two known and previously described methods, the correct hook position of the fibers with head hooks in the combing process is dispensed with in this example. The technological disadvantages that may arise are accepted in special cases and partially offset by the increase in productivity by shortening the overall process in relation to the net proceeds. The sliver 2 formed by the cards 1 is also deposited in cans 3. These cans 3 are transferred to an infeed table 19 of a winding machine 35. The slivers, which are withdrawn from the cans 3, reach a first via a suitable feed device 20 Drafting stage S1, which is shown in the exemplary embodiments according to FIGS. 7 to 9.

The feed device 20 is shown schematically in a top view in FIG. 13. The feed device shown here consists of two conveyor belts 21, 22, which are each intended to receive and convey three groups (I-111) of fiber belts (FIG. 12). For example, a group consists of 16 adjacent fiber slivers. As a result, 48 cans must be placed in the infeed table 19 for each conveyor belt 21, 22. A total of 96 cans are thus presented to the infeed table 19 for further processing. This number is due to the corresponding design of the first drafting stage S1 and a subsequent drafting stage S2.

As can be seen from FIG. 12, the drafting stages S1 and S2 are arranged in parallel next to one another in three groups I to III in accordance with the feed of the fiber slivers 2. As also indicated in Fig. 12, the drive guide for all three groups I to III is carried out continuously. However, it would be conceivable to provide the individual groups with individual drives.

The schematic side view of the exemplary embodiment according to FIG. 12 can be seen in FIG. 11. The sliver groups (I - III) fed by the conveyor belts 21 and 22 are fed in the first drafting stage S1 to two drafting units 23 and 24 arranged in parallel. It can be seen from FIG. 12 that three such drafting units 23 and 24 are connected to one another in terms of drive.

To explain the example, it is again assumed that a sliver has a mass of 5 ktex. This means that each drafting unit 23 or 24 is made up of 16 bands of 5 submitted ktex (5 g / m). This corresponds to a total mass of 80 g / m each. This mass is twisted twice on each drafting system 23, 24, so that the fleece emitted from the respective drafting systems 23 and 24 has a mass of 40 g / m. These nonwovens 25 and 26 (abbreviated to nonwovens) are combined or doubled and fed to a second drafting stage S2.

The second drafting system stage consists of three adjacent drafting systems 27, which stretch the supplied and doubled fleece three times, so that a fiber fleece 28 with a mass of approx. 27 g / m is delivered to the respective drafting system 27. As can be seen from FIG. 12, these nonwovens 28 are discharged laterally via sweeping devices (not shown in more detail) and placed on top of one another or doubled. The cotton web 29 thus created in turn has a mass of 80 g / m, which is required for the subsequent combing process.

As already known, the cotton web 29 is guided over several calender rolls 30 and reaches the area of the winding rolls 31, over which a roll 33 is formed with the aid of a sleeve 32. This winding 33 is ejected from the winding area by means of a schematically shown ejection device 34 and transported to a subsequent combing machine 11 for further processing by means of a transport system (not shown in more detail).

In the example of the known method according to FIG. 1, the entire band doubling, which gives a measure of the uniformity of the wadding per unit length, is composed of a 24-fold doubling on the wadding machine 5 and a 6-fold doubling on the sweeping section 8. This results in a total duplication of 144. The cross-sectional duplication, which represents a measure of the uniformity of the wadding cross section and is achieved by the fleece doubling, is carried out six times in the example according to FIG. 1.

In the embodiment according to FIG. 2, the tape duplication is composed of an 8-fold duplication on the section 13 and a 24-fold duplication on the tape duplicating machine 16. This results in a total duplication of 192. The cross-sectional duplication is carried out on the belt duplicating machine, but only twice.

The total duplication according to the exemplary embodiment according to FIG. 3 corresponds to the number of cans presented, that is to say 96 in this case.

According to the embodiment of FIG. 3 with a drafting system combination according to FIGS. 11 and 12, a double cross-sectional duplication is produced between the first drafting stage and the second. Subsequent to the second drafting stage, a triple cross-doubling is obtained, i.e. the total cross-sectional doubling is six-fold.

This cross-sectional duplication according to the example according to FIG. 3 corresponds to the cross-sectional duplication according to the known method according to FIG. 1. That means that with this arrangement an equally homogeneous cross-sectional distribution is obtained, by means of which the clamping effect already described in the combing pliers is advantageously influenced. The total band duplication in this exemplary embodiment is lower than in the known methods according to FIGS. 1 and 2. On the other hand, the amount of material processed at the same time is very high and ensures high productivity.

Since the quality of the slivers supplied by the cards has been markedly improved with regard to the uniformity, it is not absolutely necessary to double the strips in order to achieve a certain uniformity of the cotton in the longitudinal direction. This means that due to the improvement in the quality of the card sliver, approximately the same quality can be achieved today with a lower doubling than was previously possible with a high doubling.

The design of the winding-forming machine 35 proposed according to the invention not only enables the processing of a large amount of material, but also ensures that the process is shortened. This means that in the exemplary embodiment according to FIG. 3, the process line including the combing machine and the card consists of a total of three processing stages, while four working stages are necessary in the known systems according to FIGS. 1 and 2.

In order to take into account the correct check mark position in the method, different designs are proposed in FIGS. 4 to 8. In the example of FIG. 4, a decanting station 36 is connected between the card 1 and the winding-forming machine 35, the slivers deposited in the cans 3 being decanted into cans 37. The decanting can be carried out by a decanting device (not shown in more detail), the sliver 2 being pulled out of the can 3 and placed in the can 37. However, it could also be done by simply tilting the jug 3 by 180 °, the jug stick falling into the jug 37 positioned underneath. As a result of this transfer process, the hooks of the fibers are reversed in relation to the feed direction of the sliver at the infeed table 19. That is, fiber slivers are also on the infeed table 19 Drag hooks are pulled off, so that 11 head hooks are present when the reel 33 is rolled up on the combing machine.

The position of the tick is indicated schematically in Figures 4 to 8.

Another possibility is shown in accordance with FIG. 5, the can 3 being filled from the bottom and the withdrawal at the inlet table 19 from the head of the can 3. This means that the conveying direction of the sliver 2, in which it was deposited on the card, remains in place at the infeed table 19. An example is e.g. can be seen from DE-OS 16 85 629.

In the example of FIG. 6, a tilting station 38 is provided between the card 1 and the winding-forming machine 35, in which the cans 3 are tilted in such a way that their bottom then points upward. The can tilted in this way is presented to the infeed table 19 for pulling off the slivers from the bottom side. To make this possible, the jug must be designed accordingly and, if necessary, certain positions must be provided for the beginning of the sliver.

Another alternative for maintaining the correct tick position is shown in FIG. 7, in which the nonwoven fabric from the drum 59 of the card 1 is removed by a take-off roller 60 such that the fibers with head hooks are deposited in the can 3, as shown schematically. As a result, head combs are again presented to the combing machine for combing out.

FIG. 8 shows a further possibility of correcting the tick position, a wrapping device 61 being provided following the wrapping-forming machine 35. In this case, the roll 33 placed on support rolls 63 is unwound and wound onto a sleeve 66, which rests on support rolls 64. The winding 65 thus formed arrives with the correct check mark position on the combing machine 11 and is processed there.

9 shows a further embodiment of the device according to the invention, the first drafting unit stage being provided with four drafting units 39 operating in parallel. Each of the drafting systems 39 is, for example, loaded with 16 fiber ribbons of 5 ktex each and has a delay of approximately 2.6 times. In this case, a feed device 20 with four conveyor belts or other conveying means is necessary in order to transfer the fiber belts from the infeed table to the respective drafting device 39. In the present example, 64 cans are placed on the infeed table.

The nonwovens 42 emerging and discharged from the drafting devices 39 are laid one on top of the other and fed to a subsequent drawing device 40 of the second drafting device stage. The wadding web formed by the doubling is warped in the drafting device 40 with a 1.5-fold warping, so that a wadding web of 80 g / m is then again present. This wadding web passes over calender rolls 30 to the winding rolls 31, via which, as already described, a roll 33 is formed.

10 shows a further embodiment, six drafting devices 41 being arranged in parallel in the first drafting stage S1. Each drafting device 41 is fed sixteen slivers of 5 ktex each via a feed device 20, not shown. The drafting devices 41 make a double twist on the sliver mass supplied, as a result of which a non-woven fabric 42 of 40 g / m is released in each case. These nonwovens 42 are doubled and each fed to a drafting device 43 of the second drafting stage S2. The drafting systems 43 draw the material 3-fold so that a fleece 44 with a mass of each 27 g / m is present. These three non-woven fabrics 44 are relined and pass through the calender rolls 30 to the winding rolls 32, via which, as already described, a roll 33 with a sleeve 32 is formed.

The total duplication in this embodiment corresponds to the can template and is 96 times. The cross-doubling in this case is six times, while the cross-doubling in the previously described embodiment according to FIG. 9 is four.

The proposed division into two drafting stages with at least one cross-section duplication between these drafting stages achieves a homogeneous wadding in cross-section and enables a process shortening and thus an increase in productivity without reducing the quality of the wadding web presented to the combing process.

14 shows a further variant of an embodiment with only one drafting stage S3. The slivers 2 formed on the card 1 are presented directly to a feed table 19 via suitable transport devices or with the interposition of various devices according to FIGS. 4 to 7 in order to achieve the correct tick position, which feeds the slivers 2 in groups 45 to the respective drafting system 46. In the example shown, four such drafting systems 46 are arranged in parallel. The nonwovens 47 released and drawn by the drafting units 46 are combined or doubled in pairs in the roller pairs 48. After passing through the roller pairs 48, the nonwovens 49 formed in the process are fed to calender rollers 30 and are combined to form a nonwoven. The fleece is calendered and fed to the winding device 17.

Above the winding rollers 31, a sleeve 33 is formed using a sleeve 32, which is then ejected after completion via an ejection device 34 and transferred individually or in groups to the following combing machine 11 via a transport device, not shown.

This embodiment also enables a shortening of the process, since the card slivers are presented directly to the winding-forming machine 35 without interposing an additional stretch. The arrangement of four drafting units 46 working in parallel enables the simultaneous processing of a large number of fiber slivers.

In the example shown in Fig. 14, the sliver groups 45 consist of groups of e.g. 16 fiber ribbons at 5 ktex = 80 g / m per drafting system 46. This results in a total of 4 x 16 = 64 times total doubling and 4 times cross-sectional doubling. The webs released by the drafting units 46 have a mass of 20 g / m (ktex) after a 4-fold warping.

As with the nonwovens in the other examples shown, the mass of these nonwovens 47 formed after the drafting units 46 is relatively high with two drafting stages in comparison with the nonwovens of only 13 g / m in the known sweeping section in the classic process. This means that the nonwovens with a larger mass can be guided and deflected more easily since there is no risk of breakage. Safe fleece transport within the winding-forming machine 35 is therefore also obtained.

The term "doubling device" is not to be interpreted restrictively to a corresponding device, but rather also includes means that only allow at least two nonwovens to be brought together.

Claims (22)

Process for producing a roll (33, 65) which serves as a template for combing out on a combing machine (11), fiber slivers (2) formed in a preliminary process being fed to a roll-forming machine (35), characterized by the following process steps: - Group-wise stretching of the supplied slivers (2) - Grouping of the nonwovens formed in this way (25, 26, 42) - Grouping of the doubled non-woven fabrics - Doubling of the stretched non-woven fabrics (28.44) - Winding up the doubled non-woven fabrics into a roll (33). Process for producing a roll (33, 65) which serves as a template for combing out on a combing machine (11), fiber slivers (2) formed in a preliminary process being fed to a roll-forming machine (35), characterized by the following process steps: - Group-wise stretching of the supplied slivers (2) - Doubling of the nonwovens thus formed (42) - Stretching the doubled non-woven fabrics - Winding up the nonwoven formed in this way to form a roll (33). Process for producing a roll (33, 65), which serves as a template for combing out on a combing machine (11), fiber slivers (2) formed in a preliminary process being fed to a roll-forming machine (35), characterized by the following process steps: - Feeding carded slivers (2) to a winding-forming machine (35) - Group-wise stretching of the supplied slivers (2) - doubling of the stretched non-woven fabrics (47) - Winding up the doubled non-woven fabrics into a roll (33). A method according to claim 3, characterized in that at least four groups (45) of fiber bands (2) working in parallel drafting devices (46) are fed. Method according to one of Claims 1 to 4, characterized in that the slivers (2) are formed on cards in the preliminary process and are stored in intermediate stores (3) from which they are drawn off for feeding. Method according to one of Claims 1 to 4, characterized in that the fiber slivers (2) are formed on cards (1) in the preliminary process, are each stored in a first intermediate store (3) and then transferred to a second intermediate store (37), from which they are deducted for feeding. A method according to claim 5, characterized in that the conveying direction of the fiber slivers (2), in which they were deposited in the respective intermediate store (3) when they were deposited on the card (1), is maintained when they are fed to the winding-forming machine (35) . Method according to one of claims 1 to 4, characterized in that the reel (33) formed after the last lap is wound before it is presented to the combing machine (11). Method according to one of claims 1 to 4, characterized in that the pre-process for the card (1) pulled fibers are removed in such a way that they are present during the subsequent band formation with head hooks (K). Device for producing a roll (33, 65), which serves as a template for a comber (11) according to one of the methods 1 or 2, with a process step for forming fiber slivers (2), which a roll-forming machine (35) has via an infeed frame (19) are fed,
characterized in that the winding-forming machine (35) has at least two drafting device stages (S1, S2) connected in series, the first stage (S1) being provided with at least four drawing devices (39, 41) connected in parallel, through which the supplied fiber slivers ( 2) guided proportionally and the nonwovens (42) thus formed are doubled at least in pairs via a doubling device and fed to a subsequent drafting unit (40, 43) of the second drafting unit stage (S2), which is followed by a winding device (17) for winding formation. Apparatus according to claim 10,
characterized in that the second drafting unit stage (S2) is provided with at least two parallel drafting units (43) through which the non-woven fabrics (42) formed after the first drafting unit stage (S1) are guided proportionally and a doubling device is connected downstream of the second drafting unit stage for doubling the nonwoven fabric (44) formed and for transfer to a subsequent winding device (17). Device according to claim 11,
characterized in that the first drafting stage (S1) consists of six (42) and the second (S2) consists of three (43) drafting systems connected in parallel to one another. Device according to one of claims 10 to 12,
characterized in that the drafting devices (39, 41) of the first drafting device stage (S1) - seen in the vertical direction - are arranged one above the other. Device according to one of claims 11 or 12,
characterized in that the drafting devices (41, 43) of the first and the second drafting device stages (S1, S2) - as seen in the vertical direction - are arranged one above the other. Device according to one of claims 10 to 12,
characterized in that the drafting devices (23, 24) of the first plug-in unit stage (S1) are arranged above the second drafting unit stage (S2) and the conveying direction of the material passed through the plug-in unit stages (S1, S2) is oriented essentially vertically. Device according to one of claims 10, 11, 12, 14 or 15, characterized in that the first and second drafting stage (S1, S2) are divided into several groups (I, II, III) lying next to one another in the horizontal direction, each group - seen in the vertical plane - in the first drafting unit stage (S1) has paired drafting units (23, 24) which deliver the nonwoven fabrics (25, 26) thus formed to a doubling device and a subsequent drafting unit (27) of the second drafting unit stage (S2) . Device according to claim 16,
characterized in that a doubling device is arranged after the second drafting stages (S2) of the respective groups (I-III), which combines the nonwovens (28) formed in the individual groups to form a nonwoven fabric (29) and to the subsequent winding device ( 17) issues. A method according to claim 17,
characterized in that the non-woven fabrics (28) released by the individual groups (I-III) are drawn off transversely to the conveying direction of the drafting devices (27). Method according to one of claims 1, 2 or 10,
characterized in that the total delay of the two drafting stages (S1, S2) is between 4 and 10. Device for producing a roll (33, 65), which serves as a template for a combing machine (11) according to the method of claim 3, with a process step for forming fiber strips (2), which a roll-forming machine (35) via an infeed frame ( 19) are fed
characterized in that the winding-forming machine (35) is provided with at least four drawing units (46) connected in parallel, through which the supplied fiber slivers (2) are guided proportionally and the fiber webs (47) formed thereby are doubled via a doubling device (48), which a winding device (17) is arranged downstream. Method according to one of the preceding claims, characterized in that at least 56 fiber slivers (2) are simultaneously fed to the winding-forming machine (35) via the infeed table (19). Device for carrying out the method according to claim 21,
characterized in that the feeding of the fiber slivers (2) takes place via a plurality of conveying devices (21, 22), each conveying device having a proportionally equal subset of fiber slivers (2), each one drawing frame (23, 24, 39, 41, 46) of the first drafting stage (51) feeds.

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