EP1797227B1 - Method and device for producing strips - Google Patents

Abstract

A process for the production of tapes from a web of polymeric material, as well as an apparatus for carrying out the process, in which a polymer melt is extruded to form the web, which is then cooled, and drawn off. The web is then cut to form a tape sheet composed of a plurality of tapes. According to the invention, before its drawing, the sheet of tapes is divided into several groups of tapes and drawn separately. For this, a drawing device is provided with which the tapes are drawn separately after division of the sheet of tapes.

Description

The invention relates to a method for producing tapes from a film web according to the preamble of claim 1 and to an apparatus for carrying out the method according to the preamble of claim 9.

A generic method and a generic device are from the EP 1 095 892 A2 known.

In the known method and the known device, a film web is extruded from a polymer melt, cooled and withdrawn to a cutting device. In the cutting device, the film web is cut into a plurality of ribbons. The tapes are then stretched together as a band of ribbons and individually wound into coils. The method according to the invention and the device according to the invention are therefore particularly suitable for producing a multiplicity of tapes of the same type and quality from a film web.

In the DE 102 41 371 A1 For example, a method and an apparatus are described in which a part of the tapes are separated before being wound up into a subgroup which receives an additional treatment. Thus, the production of ribbons has been improved so that at least one subset of the plurality of ribbons can be produced in a manner prescribed by additional treatments of different configuration. In this case, however, all the bands are stretched together as a band of ribbons, so that the additional treatment can take place either before or after the stretching.

The methods and devices known from the prior art for the production of tapes from a film web are thus based on the stretching of the tapes taking place in accordance with the principle of a draw draw.

However, such crowding expansions can be carried out safely only at relatively low operating speeds, since thread breakages occurring at high speeds cause problems in handling and, in particular, problems with sympathy breaking of adjacent tapes.

It is therefore an object of the invention to develop a method and an apparatus for producing tapes from a film web according to the aforementioned type such that the tapes can be produced from a film with the highest possible production speed.

Another object of the invention is to increase the flexibility in the production of film tapes. In particular, it is the object of the invention to provide a method and a device with which ribbons with different product qualities can be produced.

The object is achieved by a method with the features of claim 1 and by a device having the features of claim 9.

Advantageous developments of the invention are defined by the features and feature combinations of the respective subclaims.

The invention is characterized in that the number of simultaneously stretched by a drafting ribbon can be reduced to a production speed and handling size adapted. For this purpose, the band of ribbons is divided before stretching into several groups of ribbons, which are each stretched separately and independently. For this purpose, the device according to the invention has a stretching device formed from a plurality of drafting devices, by means of which the strips can be stretched separately after the band of ribbons has been divided. Depending on the number of drafting devices provided, the tapes can thus be stretched to several or individually. The invention thus creates new production possibilities in the processing of a film web to film tapes. The invention Method and apparatus of the invention allow a doubling of the previously known production speeds up to 1,000 m / min.

The method variant, in which each group of bands is stretched by individually predetermined setting parameters, is characterized in particular by the fact that ribbons in different product qualities can be produced from a given film quality. Thus, different strengths of the produced ribbon can be achieved by different stretch ratios. This makes it possible to produce tapes for different applications in a process and on a device from a film web. In this case, for example, the draw ratio or the temperature control of the tapes for stretching can be predetermined and set as setting parameters.

Likewise, there is the possibility to cut the bands of the ribbon groups by individually predetermined cutting widths. The production of ribbons with different titers in one process is thus easily feasible.

The flexibility of the production of the ribbons can be improved by the process variant in which at least one of the groups of ribbons receives at least one additional treatment before stretching, during drawing or after drawing. Thus, as an additional treatment, a fibrillation, a temperature control or a preparation can be carried out individually or together on a group of ribbons. Likewise, post-extrusions, heat-setting or relaxations can be carried out as an additional treatment on one or more groups of ribbons.

The inventive method is thus characterized by the fact that different groups of bands can be produced from a film web for different applications with maximum production speed. It is possible to perform the tapes with different titers and different product properties in terms of strength, elongation and shrinkage and with or without additional treatment.

In order to be able to make individual settings for stretching the ribbon groups, the further development of the device according to the invention is particularly advantageous, in which the drafting devices are independently drivable and controllable by separate drives. In that regard, for example, high-strength tapes with a high degree of hiding and tapes with high strains and relatively low draw can be produced simultaneously from a film.

Depending on the division and assignment of each drafting a plurality of winding units of the take-up or only one winding unit of the take-up device can be assigned. In particular, in the event that a drafting and a winding unit is used per ribbon, allows the use of small units, which facilitate handling at high speeds.

In order to carry out the group and individual treatment of the bands without retroacting the upstream coulter treatment of the bands, according to a particularly preferred embodiment of the invention, each of the drafting devices assigned a Fadenbremseinrichtung, through which the inlet of the bands to the individual drafting systems is adjustable. In addition, we support the individual adjustment of the drafting systems.

When dividing individual or fewer strips on a drafting, the drafting can be advantageous form by several godets or godet units consisting of a godet with bathe, at least one of the godets is formed heatable. Thus, the temperature of the ribbon is possible in a simple manner. Additional heaters between the drafting or the godets can be avoided.

In order to enable a compact design in a complete system for the production of ribbons, the godets and godet units of the drafting systems are preferably held side by side and / or one above the other on a frame wall.

Here, the frame wall is preferably modular, wherein the modules are designed as a carrier for drafting and as a carrier for winding units. This flexible assembly and possible conversions and the inclusion of additional equipment in a simple manner possible.

The separation of the ribbon is advantageously already immediately after cutting the ribbon. For this purpose, the cutting device is assigned a thread guide strip with a plurality of thread guides.

To increase the flexibility in the production of tapes of different product qualities, the development of the device according to the invention is preferably used, in which additional treatment facilities are associated with at least a portion of the drafting equipment. For example, needle rollers for fibrillation, preparation devices for preparation, heaters for heat-setting, godets for re-stretching or shrink treatment can be provided as treatment devices.

In the production of the film web, the cooling device is preferably designed as a cooling bath to achieve higher production speeds, so that rapid cooling of the freshly extruded film web is possible. In this case, the cooling bath in a discharge area a plurality of deflection rods or pulleys are assigned to spin-off the adhering residual moisture on the film by multiple sharp deflection.

This has proven particularly useful when the pulleys are located directly above the cooling bath, wherein at each pulley a sharp deflection of the film web is made at an angle greater than 90 °. As a result, the liquid can safely deliver even at high speeds.

The method according to the invention and the device according to the invention for carrying out the method will be described in more detail below with reference to some exemplary embodiments with reference to the attached drawings.

Fig. 1

schematisch eine Ansicht eines ersten Ausführungsbeispiels einer erfindungsgemäßen Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens

Fig. 2

schematisch eine Ausschnittansicht des Bändcheneinlaufs in die Streckwerke des Ausführungsbeispiels nach Fig. 1

Fig. 3

schematisch eine Ansicht eines weiteren Ausführungsbeispiels der erfindungsgemäßen Vorrichtung

Fig. 4

schematisch eine Ansicht eines Ausführungsbeispiels einer Streck-Wickel-Einrichtung

They show:

Fig. 1

schematically a view of a first embodiment of a device according to the invention for carrying out the method according to the invention

Fig. 2

schematically a partial view of the ribbon inlet in the drafting of the embodiment according to Fig. 1

Fig. 3

schematically a view of another embodiment of the device according to the invention

Fig. 4

schematically a view of an embodiment of a stretch-winding device

In Fig. 1 and Fig. 2 a first embodiment of the device according to the invention for carrying out the method according to the invention is shown schematically. This shows Fig. 1 a view of the complete device and Fig. 2 a section of the device in the region of a drawing device. Unless an explicit reference is made to one of the figures, the following description applies to both figures.

The device consists of an extruding device 1, a cooling device 4, a take-off unit 7, a separating device 8, a drawing device 13 and a winding device 15, which are assembled into a process run.

The extruder device 1 is formed by an extruder 3 and an extrusion tool 2 connected to the extruder 3 on the outlet side. Here, a plastic granules in the extruder 1 is melted in the extruder 3 and extruded at the discharge end by the extrusion die 2 to form a film web 9.

For cooling the freshly extruded foil web 9, the extrusion die 2 is assigned directly to the cooling device 4. In this embodiment, the cooling device 4 is formed by a cooling bath 5, in which a cooling liquid is contained. In this case, the extruded film web 9 enters immediately the cooling liquid within the cooling bath 5, so that the film web 9 is solidified on its surface. When the film web 9 is pulled off, it is guided out of the cooling liquid via a plurality of deflecting rollers 6 arranged above the cooling bath 5 in a discharge region. In this example, three pulleys 6 are shown, at the periphery of the film web is guided with Teilumschlingung.

To deduct the film web 9 is guided over several withdrawal rollers 40 of the deduction 7 and promoted to the deduction 7 downstream cutter 8. The cutter 8 includes a cutter bar 38 having a plurality of blades that cuts the film web 9 into a bundle of tapes 10. Such a cutting device is for example from the DE 198 43 428 A1 known, so that reference is made to the cited document at this point.

In order to guide the film web or the strip of ribs, respectively, input rollers 39 and output rollers 33 are assigned to the cutter bar.

To deduct the ribbon of the cutting device 8 is a stretching device 13 downstream. The stretching device 13 is formed in this embodiment by three superimposed superimposed drafting systems 14.1, 14.2 and 14.3. Between the drafting systems 14.1, 14.2 and 14.3 and the cutting device 8, a yarn guide bar 12 is arranged with a plurality of yarn guides to make a division of the yarn sheet in several ribbon groups 11.1, 11.2 and 11.3. After division of the band of bands, each band group 11.1, 11.2 and 11.3 is assigned one of the drafting systems 14.1, 14.2 and 14.3. In this embodiment, the bands of the ribbon group 11.1 are guided by the drafting system 14.1, the ribbon group 11.2 through the drafting system 14.2 and the ribbon group 11.3 through the drafting system 14.3. Each of the drafting systems 14.1, 14.2 and 14.3 has a plurality of draw rollers 20 through which the associated tapes are stretched. For this purpose, the draw rolls 20 are designed to be heated. The draw rolls 10 are driven individually, so that individual drawing ratios in the drafting systems 14.1, 14.2 and 14.3 are adjustable.

In Fig. 2 is a plan view of the drawing device 13 with the supplied ribbon groups 11.1, 11.2 and 11.3 shown. The ribbon groups 11.1, 11.2 and 11.3 are each formed by six tapes 10. In this case, the bands 10 of the individual ribbon groups 11.1, 11.2 and 11.3 have different widths, so that in each case bands of different product quality are produced from the ribbon groups 11.1, 11.2 and 11.3. After the separation of the tapes 10 by the thread guide strip 12, the tapes 10 are distributed over a guide roller 22 and guide rails 36 on the individual floors of the drawing device 13. Each of the drafting systems 14.1, 14.2 and 14.3 can be driven and controlled by separate drives, so that each band group can be stretched with individual adjustment parameters.

For tempering the ribbon before stretching there is also the possibility to lead the ribbon groups 11.1, 11.2 and 11.3 together or separately by heaters.

As in Fig. 1 shown, the take-up device 15 with a plurality of winding units 16.1, 16.2, 16.3, etc. is arranged at the end of the device. The winding units 16.1, 16.2, 16.3, etc. are all constructed identically, wherein in each of the winding units each a ribbon is wound into a coil. Such winding units are for example from the WO 99/41180 known, so that at this point express reference to the document can be taken. Here, the winding units are independently driven and controllable, so that adapted to the stretch ratio winding of the ribbon is possible.

The winding units 16.1, 16.2, 16.3, etc. are arranged in three floors one above the other and in each floor to several side by side. Here, the winding units 16.1 of the upper floor are assigned to the drafting system 14.1. The winding units 16.2 of the middle floor are assigned to the drafting system 14.2 and the winding units 16.3 of the lower floor to the drafting system 14.3. Thus, the bands of the ribbon group 11.1 in the winding units of the upper floor, the ribbon of the ribbon group 11.2 in the middle floor and the ribbon of Ribbon group 11.3 in the lower floor of the take-up device 15 each wound into coils.

To start the process and to discharge torn ribbon a suction device 32 is provided, which is connected to the withdrawal unit 7 and the cutting device 8. In particular, on the outlet side of the cutting device 8, a suction probes 33 is formed, through which individual ribbons are removed after a ribbon break. The suction nozzle 33 is associated with the output rollers 37, which stir as a pinch rollers the strip of bands in a clamping coil. The intended for monitoring the ribbon run thread monitor and thread chipper, which may be assigned to the winding units and the drafting units are not shown here. In addition, it is also possible to expand the suction device 32 such that each of the drafting devices is associated with a proboscis.

With the in Fig. 1 illustrated embodiment of the device according to the invention can be produced in parallel by the inventive method of an extruded film web multiple groups of tapes with different product qualities. By dividing the band of bands before stretching, the drafting groups assigned to the individual groups can be constructed in a more compact and handling-friendly manner, so that larger production speeds become possible. The number of drafting systems and the number and distribution of the ribbons is exemplary in this case.

To allow the highest possible production speeds in the production of tapes from a film, the number of drafting systems is preferably selected equal to the number of tapes.

In Fig. 3 For this purpose, a further embodiment of the device according to the invention for carrying out the method according to the invention is shown. The embodiment is essentially identical to the embodiment according to Fig. 1 , so that only the differences will be explained below and otherwise reference is made to the preceding description.

In order to cool the film web 9 after extrusion by the extrusion die 2, the film web 9 is passed through the cooling bath 5. Above the cooling bath 5, a total of three deflection rollers are arranged at a distance from one another in such a way that the film web 9 is guided at each of the deflection rollers 6 with a sharp deflection. The illustrated embodiment, the film web is guided on the pulleys with a wrap angle of about 150 °. The liquid residues entrained through the film web are reliably thrown off even at high production speeds. Due to the arrangement of the deflection rollers 6 above the cooling bath, the cooling liquid residues fall directly back into the cooling liquid bath. In that regard, the embodiment is after Fig. 3 particularly suitable for extruding and cooling a film web at high production speeds.

The further course for removing and cutting the film web is identical to the aforementioned embodiment according to Fig. 1 ,

At the in Fig. 3 The apparatus shown stretching device 13 and the winding device 15 are held together on a frame wall 21. For this purpose, the frame wall 21 a plurality of stretching modules 24 and a plurality of winding modules 23. The stretching modules 24 each carry a drafting system 14.1, which are arranged side by side to several in a vertical plane. The winding modules 23 arranged below the stretching modules each carry a winding unit 16. 1, which are held to a plurality of in a vertical arrangement on the frame wall 21. The stretching device 13 and the winding device 15 have a total of six units, wherein a respective drafting unit 14.1 a winding unit 16.1 is assigned.

Each of the drafting units 14.1 has two godet units 25, which are each formed by a driven godet 26 and an associated Beilaufrolle 27. On an inlet side, the drafting systems 14.1 have a thread brake 28.

The drafting units 14.1, 14.2 ... associated winding units 16.1, 16.2 ... are identical to the previous embodiment formed. In this case, in each of the winding unit 16.1 a ribbon with substantially constant Voltage and uniform peripheral speed wound into a coil 18. The regulation of the winding spindle 17 takes place by means of a dancer arm control 19.

At the in Fig. 3 illustrated embodiment, a film 9 is extruded from a polymer melt in a cooling bath 5. After cooling and stripping the film web 9, this is cut into several tapes 10 and then distributed to the defined number of drafting systems 14.1, 14.2 .... By the yarn brake 28 at the entrance of the drafting systems 14.1, 14.2, ... is a defined and set on the number of drafting systems 14.1, 14.2, ... uniform bias on the ribbon. The stretching of the individual ribbons in the drafting systems 14.1, 14.2, ... can be done with the same setting parameters or individually predetermined parameters. For heat-setting, the godets 26 of the drafting systems are designed to be heated. It was found that the temperatures required for stretching were well below the values used in a draw. The tapes are each guided with several wraps on the heated godets 26.

After stretching, the tapes are wound into coils 18 in the associated winding units 16.1, 16.2. Due to the individual stretching of the ribbons and the compact execution of the drafting systems, a production speed of up to 1,000 m / min. Could be achieved with good handling. be achieved. The production capacity is thus not determined as hitherto over a working width of the film web but exclusively via the output of the extruder.

To carry out the method according to the invention consists in the in Fig. 3 illustrated embodiment, the possibility that several drafting units and a plurality of winding units is each assigned to a group of ribbons and operated with the same settings. Thus, the production of groups of tapes with different product qualities is possible with defined individual stretching of the tapes. The drafting equipment associated with a group could in this case be driven by group drives.

Winding units can preferably also be used to wind up the tapes, in which continuous operation is possible by means of two winding spindles arranged on a revolver. Such a winding device is for example from the WO 03/033386 known. Here, in a revolver two winding stations are formed, which are alternately performed in an operating position and a change position, so that a continuous winding of the ribbon is possible.

In Fig. 4 a further embodiment of a device according to the invention for carrying out the method according to the invention is shown in a partial view. The partial view here shows a section of a stretch wrapping module. For this purpose, a stretching module 24 and a plurality of winding modules 23 are vertically one above the other and held in the horizontal direction in each case to a plurality of side by side on a frame wall. At a first extension module is held in the drafting system 14.1. The drafting system 14.1 has, in addition to a plurality of godet units 25, a fibrillation device 34 and a preparation device 31. The fibrillating device 34 is formed by a needle roller 29 arranged between two godet units 25 with an upstream steering roller 30. The preparation device 31 is designed as a preparation roller 35. Two drafting units 16.1 and 16.2 are assigned to the drafting system 14.1, so that two strips are simultaneously drawn, fibrillated and prepared by the drafting system 14.1.

In a neighboring stretching module, a second drafting device 14.2 is held, which has a plurality of galette units 25 for stretching and thermosetting two strips each. In the drafting system 14.2 the winding units 16.3 and 16.4 are assigned.

Each of the drafting systems 14.1 and 14.2 is associated with a yarn brake 28 in the inlet, through which a bias of the ribbon is adjustable.

Further drafting units and winding units, not shown here, adjoin in the horizontal direction, wherein the structure of the drafting units could be identical to the drafting system 14.2 as well as identical to the drafting system 14.1. It However, it is also possible to carry out drafting systems with additional options.

At the in Fig. 4 illustrated embodiment of the device according to the invention are fibrilliert in the drafting system 14.1 a first ribbon group consisting of two bands before winding into coils, stretched and prepared. A second ribbon group also with two ribbons is wound without stretching after stretching each to coils. Other ribbon groups not shown here can be edited identically to the first ribbon group or identical to the second ribbon group. However, it is also possible to treat another ribbon group in different ways and to wind coils.

The method according to the invention and the device according to the invention are therefore characterized in particular by the fact that tapes with different qualities can be produced with the highest possible production speeds. Thus, from an extruded film tapes for different applications such as packaging fabric, carpet backing fabric or for the production of cords, ropes or ropes can be used. In particular, the individual treatment of the ribbons leads to a high flexibility in the production of ribbons.

LIST OF REFERENCE NUMBERS

1

extruding

2

Extrusion die

3

extruder

4

cooling device

5

cooling bath

6

guide rollers

7

off unit

8th

cutter

9

sheet

10

ribbon

11.1, 11.2, 11.3

ribbon group

12

Thread guide bar

13

drawing device

14.1, 14.2, 14.3

drafting

15

takeup

16.1, 16.2, 16.3

winding units

17

winding spindle

18

Kitchen sink

19

Tänzerarmregelung

20

stretching rolls

21

frame wall

22

leadership

23

wound module

24

draw modulus

25

galette

26

Galette

27

companion roll

28

thread brake

29

needle roller

30

castor

31

preparation device

32

suction

33

proboscis

34

Fibrilliereinrichtung

35

applicator roll

36

guide rail

37

exit roll

38

cutter bar

39

input roller

40

off roll

Claims (22)

1. Process for the production of tapes from a foil web in which the foil web is extruded from a polymer melt, cooled, and drawn off, in which the foil web is cut to form a tape sheet with a plurality of tapes, and in which the tapes of the tape sheet, after their stretching, are each wound onto spools, characterized by the fact that the tape sheet before the stretching is divided into several groups of tapes and that each group of tapes is stretched separately.
2. Process according to claim 1 characterized by the fact that each group of tapes is stretched by setting parameters predefined individually for each such as, for example, stretching ratio or the temperature regulation.
3. Process according to claim 1 or 2 characterized by the fact that the tapes of the tape group are cut to individually predefined cutting widths, where the tapes assigned to a group have the same cutting widths.
4. Process according to one of claims 1 to 3 characterized by the fact that the tapes of one of the groups can be stretched together, in groups, or individually.
5. Process according to one of claims 1 to 4 characterized by the fact that at least one of the groups of tapes receives, before its stretching, during its stretching, or after its stretching at least one additional treatment.
6. Process according to claim 5 characterized by the fact that the additional treatment is a fibrillation, where the groups of tapes is guided as a group or individually over one or more spiked rollers.
7. Process according to claim 5 or 6 characterized by the fact that the additional treatment is a regulation of temperature, where the groups of tapes is heated as a group or individually.
8. Process according to one of claims 5 to 7 characterized by the fact that the additional treatment is a preparation, where the group of tapes is dampened as a group or individually.
9. Device for carrying out the process according to one of claims 1 to 8 with an extruding device (1), a cooling device (4), a draw-off unit (7), a cutting device (8), a stretching device (13), and a winding device (15) with several winding units (16.1, 16.2) characterized by the fact that the stretching device (13) is formed by several separate stretching units (14.1, 14.2) with which tapes (10), after the division of a sheet of tapes, can be stretched separately.
10. Device according to claim 9 characterized by the fact that the stretching units (14.1, 14.2) are driven and controlled independently of one another by separate drives.
11. Device according to claim 9 or 10 characterized by the fact that to each of the stretching units (14.1, 14.2) several winding units (16.1, 16.2) of the winding device (15) are assigned.
12. Device according to claim 9 or 10 characterized by the fact that to each of the stretching units (14.1, 14.2) one winding unit (16.1, 16.2) of the winding device (15) is assigned.
13. Device according to one of claims 9 to 12 characterized by the fact that to each of the stretching units (14.1, 14.2) a fiber brake device (28) is assigned with which the feed of the tapes can be adjusted.
14. Device according to one of claims 9 to 13 characterized by the fact that the stretching units (14.1, 14.2) are each formed by several rollers (40) or galette units (25) consisting of a galette (26) with roller (27), where at least one of the galettes is formed in such a manner that it can be heated.
15. Device according to claim 14 characterized by the fact that the galettes (26) and galette units (25) of the stretching units (14.1, 14.2) are preferably held one next to another and/or one over another on a wall (21) of the supporting frame.
16. Device according to claim 15 characterized by the fact that the supporting frame (21) is formed by a plurality of modules (23, 24), where the modules (23, 24) are formed as carriers for stretching units (14.1) and as carriers for winding units (16.1).
17. Device according to one of claims 9 to 16 characterized by the fact that a fiber guide bar (12) with a plurality of fiber guides is disposed after the cutting device (8), with which fiber guide bar (12) a separation of the tapes (10) can be carried out.
18. Device according to one of claims 9 to 17 characterized by the fact that to at least one part of the stretching unit (14.1) an additional treatment device (31, 34) is assigned.
19. Device according to claim 18, characterized by the fact that the treatment device (34) comprises a spiked roller (29) for the fibrillation of tapes, where the tapes are guided on the circumferential surface of the spiked roller (29).
20. Device according to claim 18 or 19 characterized by the fact that the treatment device (31) comprises a preparation device (35) for preparing tapes.
21. Device according to one of claims 9 to 20 characterized by the fact that the cooling device (4) is formed as a cooling bath (5) and that several deflecting rods or deflecting rollers (6) are assigned to the cooling bath (5), with which deflecting rods or deflecting rollers the foil web (9) is guided, with several partial enwrapments, after being drawn off from the cooling bath (5).
22. Device according to claim 21 characterized by the fact that the deflecting rollers (6) are disposed directly above the cooling bath (5) in such a manner that, per deflecting roller (6), the foil web (9) receives a deflection of more than 90°.

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