EP3326947B1 - Method and device for winding a strand of material - Google Patents

Description

The invention relates to a method for winding up a strand of material according to the preamble of claim 1 and to an apparatus for winding up a strand of material according to the preamble of claim 8.

A generic method for winding a strand of material and a generic device for winding a strand of material, for example, from EP 1 095 892 A2 known.

For producing a material strand from one or more synthetic tapes, it is known that a film is extruded from a thermoplastic material, which film is fed as a flat film or as a tubular film to a cutting device. The cutter divides the film into a plurality of ribbons. The tapes are led after stretching and an individual treatment in each case one or more than one to each strand of material and wound into coils. Thus, for example, it is known to use the strands of material produced from fibrillated tapes or textured tapes as harvesting yarn. The winding of the material strands into coils takes place at the end of the extrusion process.

Like from the EP 1 095 892 A2 shows a plurality of winding points is arranged in a machine frame, wherein each of the winding points includes a winding spindle for discontinuous winding one of the material strands for this purpose. The material strands continuously produced in the extrusion process are thus continuously fed to each of the winding stations. Once a coil has a desired coil size on the circumference of the winding spindle, a bobbin change takes place, which is performed manually or automatically depending on the nature and design of the winding point. During the bobbin change, it is necessary that the continuously fed material strand is taken up and continuously discharged depending on the production speed of the extrusion plant. For this purpose, it is generally known to lead the strand of material after transection of the coil by means of a suction gun. About the suction gun, the material strand is absorbed and continuously fed to a waste container.

In the production of material strands with a very high titer, however, the problem now arises that conventional suction guns are not able to accommodate such a voluminous strand of material. In these cases, it is necessary to lower the production rate of the extrusion line in order to throttle the supply of the continuously accumulated strand of material and thus to obtain the possibility of a manual removal of the finished wound coil. However, such changes in speed within the extrusion process lead to undesirable changes in the properties of the material strands.

It is an object of the invention to provide a generic method and a generic device for winding a material strand, with which or with which the continuous production of strands of material with high titers without changing the production rate is possible.

Another object of the invention is to develop the generic method and the generic device for winding a strand of material such that when winding material strands with high titer bobbin change even at relatively high production speeds are safely executable.

This object is achieved by a method in that the material strand is divided into two sub-strands immediately before the bobbin change, wherein a first sub-strand is cut through before winding and absorbed and removed by a suction device and wherein a second sub-strand used for bobbin change and the suction gun to be led.

For the device according to the invention, the solution results from the fact that the auxiliary device has a dividing device upstream in the material run through which the material strand is divisible into two sub-strands immediately before the bobbin change, wherein a first sub-strand is cut through before winding and can be picked up and discharged by a suction device and wherein a second sub-strand can be used for changing the bobbin and can be guided by the suction gun.

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

The invention has the particular advantage that the bobbin change can be carried out with conventional aids. So the usual suction guns can be used for bobbin change, the in their performance are limited and thus can accommodate only a portion of the material strand. Thus, one of the partial strands of the material strand can advantageously be used to change bobbins. The other sub-strand of the material strand is advantageously cut through before being wound up and taken up by a suction device. Here, the extraction devices usually provided in the extrusion process can be advantageously used to receive a sub-strand of the material strand during a bobbin change and to continuously lead to a waste container. The material strand could be formed from a single synthetic tape or from several synthetic tapes or even several synthetic monofilaments.

In order to obtain a defined division of the material strand, the material strand is preferably partially penetrated by a movable separating means transversely to the direction of travel. Such a mechanically generated division in the material strand allows a clear separation between the two sub-strands. The partial strands may have the same partial titer or different partial titer.

The release agent is guided back and forth between a rest position and an operating position, wherein the operating position determines a division of the material strand. This reproducible divisions of the material strand can be performed with each bobbin change.

In order to produce as little as possible a loss of material, the release agent is performed immediately after the bobbin change from the operating position back to the rest position, so that the division of the material strand will be annulled. This process is preferably controlled synchronously with the winding of the strand of material on a new coil.

In a material strand formed from a synthetic material strip, the development of the invention is preferably carried out in which the material strand is divided between two godets of a drafting system and in which the first sub-strand is cut through in a downstream of the godets material run and is sucked through the suction device. This can be used in the division of the material strand, the voltage generated between the godets in the material strand to promote the penetration of the release agent in the material strand.

In order to be able to wind a plurality of material strands parallel next to one another at a plurality of winding points, it is further provided that a division takes place in each case into two partial strands on each of the material strands for changing the bobbin.

The division of the material strands into two sub-strands is performed with a time delay by the release agent, so that the release agent is flexible for each of the material strands available.

The separation means provided for dividing the material strand is preferably guided back and forth between a rest position and an operating position by a controllable actuator. In that regard, the movement of the release agent is reproducible and relatively quickly executable.

In order for the release agent to be able to penetrate into the material strand with the least possible resistance, it is further provided that the release agent has a triangular knife blade with at least one cutting edge on one of the legs. Thus, the material strand can be advantageously divided by simply penetrating the knife blade.

The penetration of the material strand can thereby still improve in that the release agent is disposed in an area between two godets of a drafting system of the extrusion plant. Here, the suction device is associated with a suction nozzle of the downstream godet. Thus, one of the partial strands can advantageously be cut after the expiry of the godets and be absorbed directly by the suction device.

In order to be able to perform a package change at a plurality of winding points at each of the winding locations, it is further provided that the dividing device is designed to be movable such that the respective material strands are divisible for each package change in the winding positions. Thus, the dividing device can be combined with each of the winding points to a bobbin change.

For this purpose, the release agent is preferably in a linear guide parallel to the godets of the drafting system feasible and positionable.

The inventive method and apparatus for winding a material strand are described below with reference to a Embodiment with reference to the accompanying figures explained in more detail.

• Figur 1 schematisch eine Extrusionsanlage zur Herstellung von Materialsträngen mit der erfindungsgemäßen Vorrichtung zum Aufwickeln eines Materialstranges,
• Figur 2 schematisch eine Draufsicht des Ausführungsbeispiels der erfindungsgemäßen Vorrichtung aus Figur 1,
• Figur 3 schematisch eine Seitenansicht einer Teilungsvorrichtung der erfindungsgemäßen Vorrichtung aus Figur 1,
• Figur 4 schematisch eine Vorderansicht der Teilungsvorrichtung aus Figur 3,
• Figur 5 schematisch eine Querschnittsansicht eines Trennmittels der Teilungsvorrichtung gemäß Ausführungsbeispiel nach Figur 4,
• Figur 6 schematisch eine Draufsicht der erfindungsgemäßen Vorrichtung gemäß Ausführungsbeispiel nach Figur 2 während eines Spulenwechsels.

They show:

• FIG. 1 1 schematically an extrusion plant for the production of material strands with the device according to the invention for winding up a material strand,
• FIG. 2 schematically a plan view of the embodiment of the device according to the invention FIG. 1 .
• FIG. 3 schematically a side view of a dividing device of the device according to the invention FIG. 1 .
• FIG. 4 schematically a front view of the dividing device FIG. 3 .
• FIG. 5 schematically a cross-sectional view of a release agent of the dividing device according to the embodiment according to FIG. 4 .
• FIG. 6 schematically a plan view of the device according to the invention according to embodiment FIG. 2 during a bobbin change.

In the FIG. 1 is an embodiment of the device according to the invention for winding a strand of material schematically together with an extrusion system shown. In this exemplary embodiment, the extrusion plant 1 has an extrusion device 2, a draw-out drafting device 4, a drafting drafting device 5, a main drafting system 6 and a separating device 7, which are arranged one behind the other in a single-stage process and produce a plurality of strands of material in a single-stage process. At the end of the extrusion line 1, a take-up device 8 is arranged in order to wind the continuously produced material strands into a plurality of bobbins.

The extrusion device 2 is formed in this embodiment by an extruder 2.1 and an extruder head 2.2 connected to the extruder 2.1. Below the extruder head 2.2, a cooling bath 2.3 is provided, which is filled with a cooling liquid. On an outlet side of the cooling bath 2.3 is followed by a deflection 2.4 and a cutting device 2.5 at.

Within the extrusion apparatus 2, a polymer, for example a polypropylene, is melted and fed as melt to the extruder head 2.2 under pressure. At the extruder head 2.2, a flat film 3 is extruded and cooled in the cooling bath 2.3.

The deduction of the flat film 3 is carried out by the deduction drafting system 4, which includes a plurality of withdrawal godets 4.1. In that regard, the withdrawal forces for pulling off the film 3 are generated via the withdrawal godets 4.1 of the draw-out drafting system 4.

Before the film 3 is fed to the draw-out drafting system 4, the film is dried by means of the deflection device 2.4. For this purpose, the draw-off drafting device 4 is connected to a suction device 13 via a suction connection 13.1.

The film 3 is divided by the cutting device 2.5 into a plurality of ribbons 9. The bands 9 are performed as a band of bands together on the withdrawal godets 4.1 of the draw-out drafting system 4.

The draw-out drafting system 4 is followed by a supply drafting system 5 with a plurality of feed godets 5.1. The preliminary godets 5.1 of the preliminary drafting system 5 and the withdrawal godets 4.1 of the draw-out drafting system 4 are driven at a differential speed for setting a draw ratio. Both the withdrawal godets 4.1 on the draw-out drafting system 4 and the feed godets 5.1 on the supply drafting system 5 are made unheated, so that the material strands 9 designed as strips are guided and stretched at an ambient temperature corresponding to the environment.

The supply drafting 5 is followed by a heater 10 and a main drafting system 6 with a plurality of draw godets 6.1 downstream in a second drawing stage. The draw godets 6.1 are driven with respect to the feed godets 5.1 at a differential speed in order to carry out the main drawing in the second stage on the material strands 9. The heating device 10 is in this case preferably designed as a hot air oven, in which there is a hot air line for heating the material strands. The draw godets 6.1 on the main drafting system 6 are preferred formed heatable to perform on the material strands 9, a thermal aftertreatment for stress relief.

The last godets of the draw-out drafting system 4, the supply drafting system 5 and the main drafting system 6 are associated with a plurality of suction nozzle 13.1, which are connected to the suction device 13. Thus, it is possible to generate a suction flow relatively close to the circumference of the godets 4.1, 5.1 and 6.1 in order to pick up the broken strand of material in the event of a material crack and to prevent the formation of a lap on the godets.

In order to be able to wind the strips or material strands 9 at the end of the extrusion process in each case to form a coil, a separating device 7 is provided between the main drafting system 6 and the take-up device 8, through which the material strands 9 are separated from the winding stations 8. The separating device 7 has for this purpose a guide roller 7.1 and a guide rail 7.2.

Depending on the particular end product, further treatments can be carried out within the extrusion line 1 on the material strands 9. For example, it is common for synthetic tapes to be passed over a fibrillating roll. Thus, each strand of material 9 would have at least one fibrilated ribbon. However, it is also possible that the strand of material is formed from a plurality of single bands that are compacted or textured into the strand of material prior to winding. Such treatments are preferably in the area between the main drafting arrangement 6 and the separating device 7 carried out. In that regard, the in FIG. 1 shown extrusion system 1 in its construction for the production of a material strand by way of example.

To explain the device according to the invention for winding a material strand is in addition to the FIG. 1 also related to the FIG. 2 taken.

In the FIG. 2 the take-up device 8 is shown schematically in a plan view. Unless express reference is made to any of the figures, the following description applies to both figures.

On a machine frame 20 a plurality of winding points 8.1 are arranged horizontally next to each other. In this embodiment, five winding 8.1 are held side by side on the machine frame 20. The number is exemplary and depends on the number of material strands generated in the extrusion plant 1. In this case, several winding points 8.1 can be arranged vertically one above the other.

The winding stations 8.1 are identical and each have a driven winding spindle 8.2. At each of the winding spindles 8.2, a strand of material 9 is wound into a coil 18 in each case. The speed of the winding spindle 8.2 is controlled by means of a dancer arm 19. In this case, the material strand 9 is wound with a substantially constant voltage and with a constant peripheral speed of the coil 18.

The feeding of the material strands 9 to the winding points 8.1 via a plurality of yarn guides 17, which cooperate with the guide rail 7.2 of the separating device 7.

In the winding stations 8.1 shown in this embodiment, it is necessary that the bobbin change in the winding stations 8.1 be performed manually by an operator. For this purpose, an auxiliary device 11 is provided which has a manually operated suction gun 11.1. The suction gun 11.1 is coupled to a waste container 11.2 in order to be able to receive the continuously fed-in material strand 9 during a bobbin change.

In order to be able to guide the material strand 9 supplied to the winding point 8.1 via the suction gun 11.1, the auxiliary device 11 furthermore has a dividing device 12. The dividing device 12 is arranged upstream of the winding points 8.1 and arranged in the region of the main drafting unit 6 of the extrusion plant 1. To explain the dividing device 12 is below to the Figures 3 and 4 Referenced.

In the FIG. 3 the dividing device is schematically in a side view and in FIG. 4 schematically shown in a front view. Here is in Figure 4.1 and 4.2 the division device shown in different operating situations. In the Figure 4.1 is the dividing device in a rest position and in the Figure 4.2 shown in an operating position. The following description applies, insofar as no explicit reference is made to one of the figures, for both figures.

The dividing device 12 has a movable separating means 12.1. The separating means 12.1 is coupled to an actuator 12.3, by means of which the separating means 12.1 between a rest position and an extended operating position can be guided. In FIG. 3 is the release agent 12.1 shown in the rest position. The operating position of the release agent 12.1 is shown in dashed lines.

The actuator 12.3 is attached to a holder 12.2. The holder 12.2 is guided in a linear guide 12.4. The linear guide 12.4 extends parallel to the draw godets 6.1 of the main drafting system 6. The linear guide 12.4 and the holder 12.2 are arranged between two adjacent godets 6.1 of the main drafting 6, so that the release agent penetrates 12.1 in the operating position of one stretched between the draw godets 6.1 material strand 9 , The holder 12.2 can be guided and positioned parallel to the draw godets 6.1 in the linear guide 12.4, so that the separating means 12.1 can be assigned to each of the material strands 9 guided on the circumference of the draw godets 6.1. The guidance and positioning of the holder 12.2 in the linear guide 12.4 is not shown here in detail and could be done for example by manually operated spindle drives. The linear guide 12.4 is formed here by way of example by two rods, on which the holder 12.2 is guided with the release agent 12.1.

In operation during the winding of the material strands 9 to coil 18, the dividing device 12 is not activated, so that the release agent 12.1 remains in its rest position. Only when a bobbin change is imminent in one of the winding stations 8.1, the dividing device 12 is activated. So First, the holder 12.2 is positioned in the linear guide 12.4 to the relevant material strand 9, which is to divide to prepare a bobbin change.

To explain the bobbin change in one of the winding 8.1 is in addition to the Figures 5 and 6 Referenced. In FIG. 5 is shown schematically a cross-sectional view of the separating means 12.1 in the operating position. The FIG. 6 represents a plan view of the winding stations 8.1, wherein at one of the winding points 8.1 a bobbin change is performed.

As from the representations in the Figures 3 . 4.2 and 5 shows, upon activation of the dividing device 12 after reaching the desired position on the linear guide 12.4, the release agent 12.1 out in the operating position. The release agent 12.1 penetrates the relevant material strand 9 and leads to a division of the material strand 9, so that two partial strands 9.1 and 9.2 form.

As from the illustration in FIG. 5 As can be seen, the separating means 12.1 in this embodiment is formed by a triangular knife blade 16. The knife blade 16 has a cutting edge 14 at least on one leg. The knife blade 16 is held on a knife holder 15 which is coupled to the actuator 12.3. The knife blade 16 is guided by the actuator 12.3 transversely to the material run of the material strand 9. The knife blade 16 is preferably encapsulated in the rest position, for example held in a guide tube. In the operating position, the knife blade 16 penetrates the material strand 9, so that the cutting edge 14 generates a division on the material strand 9. The material strand is in the sub-strands Divided 9.1 and 9.2, which are absorbed by the downstream draw godet 6.1.

Like in the Figure 4.2 is shown, a first sub-strand 9.1 is cut immediately after the division by an operator after expiration of the last draw godet 6.1. The loose end of the sub-strand 9.1 is detected and discharged via the suction nozzle 13.1 of the suction device 13. The suction nozzle 13.1 of the suction device 13 is hereby assigned directly to the scope of the last draw godet 6.1. Thus, only the sub-strand 9.2 is guided to the winding point 8.1.

As from the illustration in FIG. 6 As can be seen, the sub-strand 9.2 can be picked up by the suction gun 11.1, so that the finished wound spool 18 can be exchanged at the relevant winding spindle 8.2. Thus, the winding spindle 8.2 an empty tube is attached to wind a new coil. As soon as the sub-string 9.2 has been taken over by the winding spindle 8.2 for winding a new reel, the divider 12 is deactivated, so that the release agent 12.1 is returned to the rest position. The partial strand 9.1 accommodated in the suction device 13 is severed by the operator so that the strand of material without division is fed to the winding point 8.1 for winding a coil.

The dividing device 12 is now ready to carry out a bobbin change at a next winding point. Thus, the material strands 9 are offset in time by the release agent 12.1 alternately divided as needed.

The method according to the invention and the device for winding up a material strand thus offer the advantage that material strands having a high titre can also be produced at higher production speeds. For example, material strands with a titer of over 20,000 dtex are needed for the production of harvested twine yarns. The material strand can in this case be formed by a single band with a corresponding bandwidth in the range between 20 mm and 90 mm and a thickness in the range of 75 μm and 100 μm or from correspondingly a plurality of individual bands or individual monofilaments.

In addition, the part titers of the sub strands are selected depending on the performance of the suction gun. Thus, the partial strands may have the same size or very different part titer.

The structural design of the dividing device shown is exemplary. Essential is the movable guidance of a release agent in order to obtain a mechanical separation of the material strand. Thus, the lifting movement of the knife blade could also be performed by a linkage to obtain a vertical as possible puncture in the material strand. The knife could be kept in the rest position in a pivoted position.

Claims (14)

1. Method for winding a material strand (9) from one or a plurality of synthetic tapes, in which method the material strand (9) at the end of an extrusion process at a winding spindle is wound in a discontinuous manner so as to form packages (18), and in which method the material strand (9) during a package changeover is received by a suction gun and guided to a waste container, characterized in that the material strand (9) directly before the package changeover is divided into two part-strands (9.1, 9.2), wherein a first part-strand (9.1, 9.2) before winding is severed and is received and discharged by a suction installation (13, 13.1), and wherein a second part-strand (9.1, 9.2) is utilized for the package changeover and is guided by the suction gun (11.1).
2. Method according to Claim 1, characterized in that the material strand (9) for dividing is partially penetrated transversely to the running direction by way of a movable separating means (12.1).
3. Method according to Claim 2, characterized in that the separating means (12.1) is reciprocated between a resting position and an operating position, wherein the operating position determines a division of the material strand (9).
4. Method according to Claim 3, characterized in that the separating means (12.1) after the package changeover is guided from the operating position back to the resting position such that the division of the material strand (9) is cancelled.
5. Method according to one of the preceding claims, characterized in that the material strand (9) is divided between two godets (6.1) of a drafting unit, and in that the first part-strand is severed in a material running portion that is downstream of the godets (6.1) and is suctioned by the suction installation (13).
6. Method according to one of the preceding claims, characterized in that a plurality of material strands (9) are produced in parallel beside one another in the extrusion process, in that the fibre strands are separately wound so as to form packages (18), and in that for the package changeover a division into in each case two part-strands is performed on each of the material strands (9).
7. Method according to Claim 6, characterized in that the division of the material strands (9) into two part-strands (9.1, 9.2) is carried out in a temporally offset manner by the separating means.
8. Device for winding a material strand (9) which in an upstream extrusion plant (1) is producible from a tape or a plurality of tapes, having at least one drivable winding spindle (8.2) for winding the material strand (9) in a discontinuous manner so as to form packages (18), and having an auxiliary installation (11) for carrying out a package changeover at the winding spindle (8.2), wherein the auxiliary installation (11) has at least one suction gun (11.1) that is connected to a waste container (11.2), characterized in that the auxiliary installation (11) in the material run has an upstream dividing device (12) by way of which the material strand (9) directly before the package changeover is dividable into two part-strands (9.1, 9.2), wherein a first part-strand (9.1, 9.2) before the winding is severed and is receivable and dischargeable by a suction installation (13, 13.1), and wherein a second part-strand (9.1, 9.2) is utilizable for the package changeover and is guidable by the suction gun (11.1).
9. Device according to Claim 8, characterized in that the dividing device (12) has a separating means (12.1) which for dividing the material strand (9) is guidable transversely to the material running direction.
10. Device according to Claim 9, characterized in that the dividing means (12.1) by way of a controllable actuator (12.3) is capable of being reciprocated between a resting position and an operating position, wherein the division of the material strand (9) is generatable in the operating position of the separating means (12.1).
11. Device according to Claim 10, characterized in that the separating means (12.1) has a triangular knife blade (16) having at least one cutting edge (14) on one of the legs.
12. Device according to one of Claims 9 to 11, characterized in that the separating means (12.1) is disposed in a region between two godets (6.1) of a drafting unit (6) of the extrusion plant (1), and in that the suction installation (13) by way of a suction port (13.1) is assigned to the godets (6.1) which are downstream in the material run.
13. Device according to one of Claims 8 to 12, characterized in that a plurality of winding stations (8.1) having winding spindles (8.2) for winding a plurality of material strands (9) are provided, and in that the dividing device (12) is embodied so as to be movable in such a manner that the respective material strands (9) are dividable for each package changeover in the winding stations (8.1).
14. Device according to Claim 13, characterized in that the separating means (12.1) in a linear guide (12.4) is guidable so as to be parallel to the godets (6.1) of the drafting unit (6).

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