EP2782858B1 - Winder for an endless material web - Google Patents

Description

The present invention relates to a winder according to the preamble of claims 1, 8 and 12.

Such a winder, which forms the closest prior art, is disclosed in the document JP-H-09 315 632 A disclosed. Flexible, endless webs of material are predominantly processed in production lines, in which an extruder produces an endless plastic film which is to be wound continuously and without interruption onto winding cores.

In particular, plastic films are produced in an extraordinary variety of compositions and correspondingly with a wide variety of properties, which then also influence the winding behavior and must be considered accordingly in the winding. Likewise, the respective production speed and the number of coils to be produced in a production run are parameters which must be taken into account for a qualitatively sufficient production with at the same time reasonable costs.

Typical processing speeds range from 2 to 1000 m / min, while the finished wound bales may have a diameter of 50 to 2000 mm and a width of 10 to 6000 mm, respectively. The thicknesses can range from a few μm down to the millimeter range. As an example may be mentioned films having a thickness of 8 microns to 25 microns. Preferably 15 microns to 25 microns, which are wound at a speed of 100 m / min and a width of about 300 mm to 770 mm on a winding shaft with 4-fold benefit (ie on a winding shaft four cores are plugged and so four reels wrapped parallel next to each other).

The formulation of particular plastic films of polyolefins (such as PE polyethylene or PP polypropylene) ranges from the mono-extruded film, consisting of a single layer, to the coextruded film with three, five or more layers, wherein, for example, adhesives of various types can be provided in the layers , as many different multilayer films arise.

Today, in the field of silage and stretch films, about forty to fifty recipes are known, which have the respective desired different properties in the application: in northern countries, for example, it is desirable in agriculture that the foil-wrapped grass bales, which can weigh up to 500 kg and remain in the field, also remain snow-covered in shape, which requires a film with high strength. In other countries, the film should be black. Alternatively, a film with a specific color, for example, optical reasons green, are preferred.

If a grass bale is wound, the adhesive contained between the plastic layers of the films ensures that the individual windings adhere to one another around the grass bale, so that the winding has stability. When the bale of grass is formed, when the film is unwound from the wrapping, a typical, scratching sound is produced which, depending on the adhesive, is louder or quieter. Various farms require quietly releasing films, which has a corresponding influence on the overall recipe of the film.

Likewise in the area of, for example, stretch films used for the packaging of goods stacked on pallets, as protective films (for example in electronics) or as food films. Thus, the food film used in the household adheres approximately at the edge of the plate by the adhesive at the place of wrap around the plate edge due to the local pressure generated by it. Again, the recipes are as numerous as the possibilities of using the slides and tailored to the particular use.

Depending on requirements, the production varies between the production of only a few identical wound bales for special applications up to the mass production of the same wound bales.

Due to the various formulations, the films themselves have different properties, which in turn must be taken into account in the winding for faultless film winding, which makes special demands on the winder parameters such as web tension, winding pressure, speed and film thickness and elasticity of the film.

Error-free winding taking into account the parameters mentioned above is also essential because with different formulations the finished wound film (the winder is usually immediately downstream of the extruder producing the film) still lives, since the different plastic layers still calm and the between the Layers of trapped air or introduced substances, often the adhesives, change and also through the layers migrate. In other words, the process of producing the films after winding is not yet completed. Not absolutely perfect winding can therefore happen that a roll later, during storage, negatively changed and unusable.

FIG. 1a shows by way of example a winder 1 according to the prior art in a side view, which represents the path of the endless material web, here a plastic film 2, through the winder 1 therethrough. A separate scraping unit 3 for scrap film is followed by a cutting unit 4, which separates the endless film 2 lengthwise, so that two separate film webs or films 5 and 5 'are formed, each of the films 5,5' for the winding in a associated turret unit 6,6 'is performed. The turret assemblies 6,6 'are basically the same structure and each have three winding shafts in the illustrated embodiment, namely a first winding shaft 10,10', a second winding shaft 11,11 'and a third winding shaft 12,12'.

The winding shafts 10, 10 'to 12, 12' are located in different work stations, namely a charging station 13, 13 ', a winding station 14, 14' and a removal station 15, 15 '.

The Revolvereinheiten 6,6 'are formed by a omitted to relieve the figure drive according to the arrows in the counterclockwise direction about their longitudinal axes 16,16' gradually rotatable, such that each of the winding shafts 10,10 'to 12,12' in another Rotation step is brought from their previous workstation to their next. The revolver units 6, 6 'thus form a means for supporting the reel 18, 18' to be wound, here as follows:
Each of the winding shafts 10,10 'to 12,12' passes in the cycle the charging station 13,13 ', where it is loaded with fresh cores passes through a further rotation step of the turret units 6,6' in the winding station 14,14 ', where the winding cores 17 are wound with the film 2 to a winding 18 and from there into the removal station 15,15 ', where the winding 18 are removed from the turret unit 6,6'.

The figure shows a finished roll 18 in the winding station 14 and a just wound winding 18 'in the winding station 18'.

A contact roller 19, 19 'contacts the winding 18, 18' and ensures in the winding station 14, 14 "the contact pressure corresponding to the respective formulation of the film Contact roller 19,19 'suspended from pendulum arms 20,20', which allows the contact roller 19,19 'according to the winding progress of the stationarily wound coil 18,18' to move accordingly.

In the following the invention with reference to a FIG. 1a trained winder described. However, the invention is not limited to such winder (here: with Revolvereinheiten, wherein the contact roller is mounted on pendulum arms). The invention is applicable to large or small winders having a single-use or a multiple-use,
FIG. 1b shows a section of the winder 1, namely the winding station 14 and the contact roller 19 including their storage, again seen from the side.

It is shown that the contact roller 19 is suspended from two laterally acting pendulum arms 20 and is thus pivotable about a pivot axis 21. By the view from the side, only one pendulum arm 20 is visible in the figure, as it covers the other pendulum arm (which acts on the other end of the contact roller 19). The pendulum arms 20 allow the contact roller 19 a movement in the direction of the arrows drawn so that they can always mitwandern with the growing diameter of the coil 18 (in the present arrangement, the winding core on which the film 5 is wound, fixedly mounted). A pressing unit, here a piston arrangement 23, ensures the contact pressure of the contact roller 19 corresponding to the formulation against the winding 18.

The film 5 runs during operation of the winder 1 via an auxiliary roll 25 and from there to the contact roller 19, where it is pressed in the contact line 26 to the winding 18 and wound on this. This ensures that the film 5 between the auxiliary roller 25 and the contact roller 19 is free only over a short distance 27, which is advantageous: the sometimes quite fast running (see above to the feed speeds) film 5 calms down even before they at the location of the contact line 28 runs on the contact roller 19, which supports a fault-free winding.

As already mentioned show the FIGS. 1a and 1b an arrangement of the prior art, which is known in the art.

It is now the object of the present invention to further improve a winder for an endless material web in order to be able to optimally wind especially difficult to wind recipes.

To achieve this object, the inventive winder on the characterizing features of claims 1, 8 and 12.

Due to the fact that the devices according to the invention provide for keeping the wrap angle of the material web traveling over the contact roller at a variable, predetermined desired value during the progressive winding, a distortion of the wound material web or film at the location of the contact line 26 between the contact roller 19 and the winding 18 suppressed or reduced. Such a delay leads even with moderately sensitive formulations to an optically visible pattern in the wound film, and in the unfavorable case for wrinkling. Both means waste production.

• Figur 1a schematisch einen Wickler gemäss dem Stand der Technik von der Seite her gesehen
• Figur 1b einen detaillierten Ausschnitt von Figur 1a mit der Kontaktwalze,
• Figur 2 eine dreidimensionale Ansicht auf einen Teil der Wickelstation, wobei die Anordnung der Kontaktwalze und der Hilfswalze gemäss der vorliegenden Erfindung dargestellt ist,
• Figur 3 schematisch die Anordnung von Figur 2, wobei zugleich der Unterschied zum Stand der Technik dargestellt ist,
• Figuren 4a bis 4e schematisch eine Sequenz, welche den erfindungsgemässen Wicklungsvorgang darstellt,
• Figuren 5a und 5b schematisch eine weitere Ausführungsform gemäss der vorliegenden Erfindung, bei welcher die Hilfswalze auf einer Schiene gelagert ist, und die
• Figur 6 schematisch eine weitere Ausführungsform der vorliegenden Erfindung.

The invention will be explained in more detail below. It shows:

• FIG. 1a schematically seen from the side of a winder according to the prior art
• FIG. 1b a detailed section of FIG. 1a with the contact roller,
• FIG. 2 a three-dimensional view of a part of the winding station, wherein the arrangement of the contact roller and the auxiliary roller is shown according to the present invention,
• FIG. 3 schematically the arrangement of FIG. 2 , wherein at the same time the difference to the prior art is shown,
• FIGS. 4a to 4e schematically a sequence which represents the winding process according to the invention,
• FIGS. 5a and 5b schematically another embodiment according to the present invention, in which the auxiliary roll is mounted on a rail, and the
• FIG. 6 schematically another embodiment of the present invention.

FIG. 2a shows a three-dimensional view of the inside of a pendulum arm 20 in a preferred embodiment of the present invention, in which the contact roller 19 is suspended from pendulum arms 20, as shown in FIGS FIG. 1b is described. Also visible is an auxiliary roller 30, which is not fixed to the pendulum arms 20, but in turn is arranged on further pendulum arms 31.

The other pendulum arms 31 for the auxiliary roller 30 are pivoted in the embodiment shown via a gear transmission 33, which in turn has a not shown for relieving the figure drive. Thus, the pivoting of the pendulum arms 20 and the other pendulum arms 31 can be independent of each other, and thus the movement of the auxiliary roller 30 regardless of the movement of the contact roller 19th

The pendulum arms 20,31 pivot about their common pivot axis 21. Preferably, the two pendulum arms 20 via a pipe 35 and the other two pendulum arms 31 via a pipe 36 connected to each other, which ensures their synchronous movement. In the embodiment shown, the tubes 35,36 are arranged coaxially with each other and also to the pivot axis 21. To relieve the figure also omitted is a machine control, which controls the drives for the pendulum arms for the contact roller 19 and the other pendulum arms 31 for the auxiliary roll 30 operable.

FIG. 2b shows one opposite the FIG. 2a modified embodiment of the present invention. Shown is a three-dimensional view on the outside of the one, in the FIG. 2a shown pendulum arm 20, here with a gear 37 which connects the pendulum arm 20 and the other pendulum arm 31 with each other. Both pendulum arms 20, 31 have the common pivot axis 21, wherein in the figure, the tube 36 is shown, which connects the visible further pendulum 31 with the second, omitted for relief of the figure and thus not visible further pendulum. The tube 35 according to FIG. 2a , which is the pendulum arm 20 connects with the opposite him (not visible in the figure) pendulum, the tube 36 would cover and is therefore also omitted to relieve the figure.

The contact roller 19 is mounted between the pendulum arm 20 and the invisible pendulum, the auxiliary roller 30 is mounted between the further pendulum arm 31 and the non-visible further pendulum.

On the pendulum arm 31, a gear 38 is fixed, which rotates in operation with the pendulum arm 31 about the pivot axis 21 (the pendulum arm 31 is also driven by a cylinder arrangement here, s., The cylinder assembly 23 of FIG. 2a ). As a result, the gear 38 engaged with the gear 38 rotates 38 ^I , which drives the gear 38 ^{III III} via a shaft 38 ^II , which in turn is in engagement with the gear 38 ^IV . The shaft 38 ^II is mounted in a suitable form on the frame of the winder, s. the schematically registered in the figure storage 39 follows the pivoting of the pendulum arm 31 so not.

Finally, the gear 38 ^{IV is} connected to the tube 36, so that the further pendulum arm 31 of the rotation of the gear 38 ^IV pivots accordingly.

It can be seen that the pendulum arm 20 and the further pendulum arm 31 are connected to each other, wherein the transmission 37 at a pivoting of the pendulum arm 20 (for example, by the cylinder assembly 23 of FIG. 2a ) generates a pivoting of the further pendulum arm 31. This in turn, depending on the transmission ratio of the transmission 37, during operation, the auxiliary roll can be continuously positioned so that the wrap angle α is constant or predetermined by a running on the contact roller 19 film, s. to FIG. 3 ,

If the transmission ratio is e.g. in the range 1: 1.5, mathematically exactly 1: 1.51, chosen, the wrap angle α for a length of the pendulum arm 20 of 600 mm, a length of the further pendulum arm 31 of 400 mm, a diameter of the contact roller 19 of 230 mm and a diameter of the auxiliary roll of 150 mm, constant.

FIG. 3 schematically shows a comparison between the in FIG. 3 illustrated embodiment of the present invention and an arrangement according to the prior art according to FIG. 1b ,

The figure shows a freshly wound winding 18, which still has a small diameter. Accordingly, the pendulum arms 20 are deflected to the right, wherein the contact roller 19 contacts the winding 18 along the contact line 26. Also deflected to the right are the inventive further pendulum arms 31, so that the auxiliary roller 30 has moved to the right. The film 5 runs on the auxiliary roller 30 and from this on the line 40 again, continue running on the line 41 on the contact roller, the contact roller 19 wraps around to the contact line 26, runs there again from the contact roller 19 and at the same time the winding 18 on.

The lines 41, 26 determine the wrap angle α of the film 5 on the contact roller 19 according to the inventive arrangement.

Shown in phantom in the figure is a notional auxiliary roll 30 * according to the prior art, i. The path 5 * of the film 5 * then running conventionally via the auxiliary roll 30 * is different: a film running in the path 5 * runs on the line 41 * onto the contact roll 19 and naturally on the line 26 from the contact roller again.

The lines 41 *, 26 determine the angle of wrap β of a film running in the path 5 * on the contact roller 19, as is the case in an arrangement according to the prior art.

It follows that the wrap angle α according to the arrangement according to the invention is smaller than the wrap angle β according to the arrangement known in the prior art.

According to the Applicant's knowledge, during the winding of the film 5, entrained air is introduced into the nip in front of the line 41 (or the line 41 *) due to the feed thereof, and then passes into the looping area. In the wrap area, especially at the location of the contact line 26, this air is compressed and thereby pressed backwards (ie against the feed direction of the film 5). This builds up in the region of the wrap angle, an air cushion, which corresponds to a state of equilibrium between the nachgeförderten constantly through the continuous film 5 and then pressed back in front of the contact line 26 air. Ami place the contact line 26 prevails by the pressure of the contact roller 19 increased pressure.

The air increasingly compressed against the contact line 26 exerts considerable additional forces on the film 5.

These forces can distort the film locally, at the same time the film can discard by resulting local bubbles of compressed air, to the formation of small air pockets. Such distortions are then pressed flat along the contact line 26 and form a pattern or wrinkles.

In other words, it is such that the film 5 can not be wound smoothly on the winding, but wrinkled on the winding 18 passes.

A reduced wrap angle α now allows the back-pressed air to escape more easily, so that the amount of air that reaches into the contact area at the location of the contact line 26 between the contact roller 19 and the winding 18 is reduced, whereby the risk of wrinkling decreases.

As a result of the arrangement according to the invention, the wrap angle α can be reduced in comparison to the conventionally occurring wrap angle β, which allows the improved winding. At this point it should be mentioned that according to the invention - i. regardless of the particular embodiment of the invention, a wrap angle α of 10 ° or less is particularly advantageous and can also be achieved.

In addition, can be adjusted by the inventive arrangement of the wrap angle α, as described below.

The above-described entry of air into the region of the contact line 26 depends i.a. from the feed rate and surface finish of the film 5, i. also from their recipe. Then depending on the recipe, which are the effects of the introduced air, i. how far an undesirable distortion of the film and the wrinkling based thereon occurs.

Accordingly, it is advantageous to provide for very sensitive films at least over a range of winding a setpoint for the wrap angle in the range of 0 ° (ie also: to keep this constant), although then a further calming of the film by one on the Contact roller resting section of the continuous film 5 is omitted. At a wrap angle of 0 ° results in a minimum resistance for the backwards to be pressed air.

On the other hand, it may be advantageous depending on the present recipe (for example, in the case of sticky films) to allow certain amounts of air in the gap between the contact roller 19 and the winding 18 and allow a wrap angle α with a predetermined setpoint. Again, this set point may be constant, at least over a portion of the winding, and / or may change in a predetermined manner during the advancing winding. The resulting winding 18 then hardens less and can be better handled.

It follows that the optimum wrap angle α depends on various factors such as the formulation of the film 5, the feed rate of the film 5, the contact pressure of the contact roller 19 on the winding 18, etc., which may include the winding progress of a coil. The person skilled in the art can determine, for example by simple experiments, how to set the wrap angle for a given recipe in conjunction with other parameters such as the feed rate. A general rule can not be given in view of the variety of recipes.

In any case, it is according to the invention to keep the target value of the wrap angle (α) during the progressive winding up to the finished roll to 90 ° or less, which allows to wrap all known today films optimally.

Depending on the type of film, the desired value of the wrap angle (α) is kept at 45 ° or less, preferably at 20 ° or less, particularly preferably at 10 ° or less during the progressive winding up to the finished roll.

According to the Applicants' experience, a range of the target value of 10 ° or less is optimal for many films and therefore of particular importance.

Of course, these setpoints can assume any value in the respective area.

In summary, the disclosed method is to make a roll from a web of flexible material, in which the flexible material is passed over a contact roll of a winder and wound into a winding, wherein the contact roll during the winding keeps in contact with the winding, and wherein the wrap angle of the material traveling over the contact roller during the progressive winding is continuously maintained at a variable, predetermined for the respective winding setpoint.

Preferably, the target value is maintained at 10 ° or less as mentioned above.

In a device according to the invention means are provided (in the in FIG. 2 In the embodiment shown, the further pendulum arms 31 with their drive 33) to adhere to a variable, predetermined for the respective winding setpoint value for the wrap angle α of the running over the contact roller 30 material web during the progressive winding of a roll 18.

Preferably, the means for a desired value of the wrap angle (α) are formed over the entire winding of a roll up to the finished roll of 90 ° or less. More preferably, means for a desired value of the wrap angle (α) over the entire winding of a roll to the finished roll of 45 ° or less, preferably 20 ° or less, more preferably formed to 10 ° or less.

According to the invention, the means are designed in such a way that the desired value can be freely selected in one of the named ranges, so that the choice is not subject to any restriction due to the concrete design of these means.

In this case, the means comprise an auxiliary roll, over which the material web is guided during operation, wherein the auxiliary roll is arranged relatively movable relative to the contact roller during the winding, such that in operation the running of the auxiliary roll material web depending on the respective position of the auxiliary roll another place on the contact roller runs.

More preferably, the relative movement of the auxiliary roller relative to the contact roller is infinitely variable, but can also, for example, in a simple, inexpensive embodiment and stepwise, if a certain variation of the wrap angle may be accepted during the winding in purchasing.

As above in the description too FIG. 2 mentions a machine control is preferably provided, which controls the pivoting drives for the pendulum arms 20 and the other pendulum arms 31 operable. In a memory of the machine control can then set values for the wrap angle α are stored, which have been determined as described above depending on the winding progress, the recipe, other parameters or in a combination thereof.

The FIGS. 4a to 4e indicate in a sequence the winding of a coil 18 from the beginning of the winding ( Fig. 4a ) to the finished roll ( Fig. 4e ). The further pendulum arms 31, which carry the auxiliary roll 30, are shown schematically in the figures for the sake of clarity as a dash.

In the figures it can be seen how at the beginning of the winding, the pendulum arms 20 are deflected to the right, and be pivoted with increasing winding progress to the left, since the diameter of the coil 18 increases. It can also be seen that, at the beginning of the winding, the further pendulum arms 31 shown schematically by a dash are also pivoted to the right relative to the pendulum arms 20 and thus moved relative to the contact roller 19, with the result that the wrap angle α (FIG. FIG. 3 ) of the film 5 on the contact roller 19 is small. In the course of the winding, the further pendulum arms 31 are pivoted to the pendulum arms 20 to the left, with the result that here the wrap angle α remains substantially constant small.

It can also be deduced from this sequence that, in the case of an auxiliary roll 30 * (30) fixed in conventional manner in the pendulum arms 20 (FIG. FIG. 3 ) the wrap angle β ( FIG. 3 ) at the beginning of the winding ( FIG. 4a ) unavoidably large and at the end of the winding ( Figure 4e ) would inevitably be smaller. This difference can easily reach 10 ° or more. It is according to the invention not only avoided, but the wrap angle α is also continuously adaptable throughout the winding for optimum winding result.

FIG. 5a and 5b show schematically a further embodiment of the present invention. Shown is a winding station 14 ( FIG. 1 ) of a winder, with a winding shaft 11 and a contact roller 19, which is not mounted on pendulum arms, but here on a multi-joint suspension 50, which has hinges 51 mounted lever 52, which in turn support arms 54 via links 53, to which the contact roller 19 is mounted. The illustrated

Arrangement allowed to move the contact roller during operation of the winder of a horizontal along, which in turn simplifies the displacement drive for the auxiliary roll 55, and its control, since the contact roller 19 linear and no longer runs on a bow.

The auxiliary roll 30 is arranged horizontally displaceable on rails 57 via a carriage 56. Depending on the position of the auxiliary roller 19 relative to the contact roller 30, a corresponding wrap angle α of the film 5 results on the contact roller.

FIG. 6 schematically shows another embodiment of the present invention. Again, the contact roller 19 is suspended from schematically indicated by a thickened stroke pendulum arms 60, wherein the pendulum arms 60 are pivotable about a pivot axis 61. The auxiliary roll 30 is slidably mounted along a portion 62 of the pendulum arms 60. The pendulum arms 60 themselves are preferably formed double cranked, such that the portion 60 is not in the connecting line 63 between the pivot axis 61 and the axis 64 of the contact roller 19, but inclined to this. If the auxiliary roller according to the double arrow 65 is moved accordingly, changes the position of the contact line 41 and thus the wrap angle a. The person skilled in the art can determine the offset and a suitable drive for the displacement of the auxiliary roll 30 along the section 62 and operatively connect with a corresponding machine control, such that during operation a looping angle α adapted to the respective winding and, if desired, adapted to the winding progress is maintained can.

According to the invention is also to move the auxiliary roller along trained straight pendulum arms, for example, when only a small operating range of the wrap angle α is considered necessary.

At this point it should be noted that the air entry described above takes place not only in the region of the wrap angle α of the film 5 on the contact roller, but in principle in the winding 18 itself. In the in the FIGS. 3 to 6 illustrated embodiments, the wrap angle α on the winding 18 is always slightly greater than 0 °. Optionally, depending on the conditions in the winding 18, the skilled person can also provide, however, to position the auxiliary roll during the winding such that a wrap on the winding 18th

Claims (14)

1. A winder for producing a roll (18) from a material web (5) of flexible material, which is guided over a contact roller (19) of the winder and is wound in the same to form a roll (18), wherein the contact roller (19), during winding, stays in contact with the roll (18), and wherein the wrapping angle (α) of the material web (5) moving over the contact roller (19) during progressive winding, is held continuously at a variable set value predefined for the respective roll,
   with a device for supporting the roll (18) to be wound, wherein in operation the contact roller (19) touches the roll (18) during winding, wherein means are provided in order to maintain, as winding of the roll (18) progresses, a changeable set value, which can be predefined for the respective roll, for the wrapping angle (α) of the material web (5) moving over the contact roller (19),
   wherein the means comprise an auxiliary roller (30), over which the material web is guided in operation, and wherein the auxiliary roller (30), during winding, is arranged so as to be movable relative to the contact roller (19), such that in operation the material web running off the auxiliary roller (30) runs, depending on the respective position of the auxiliary roller (30), onto the contact roller (19) at the location of another contact line (41), characterised in that the auxiliary roller (30) is supported on further pendulum arms (31), which themselves are arranged so as to be movable relative to the contact roller (19), and wherein the contact roller (19) is arranged on pendulum arms (20), which have a common swivel axis (21) with the further pendulum arms (31) of the auxiliary roller (30).
2. The winder according to claim 1, wherein the auxiliary roller (30) is arranged so as to be steplessly movable relative to the contact roller (19).
3. The winder according to claim 1, wherein the means for maintaining the set value for the wrapping angle (α) comprise a gear (37), via which the pendulum arms (20) and the further pendulum arms (31) are connected to each other, wherein the gear (37) during swivelling of the pendulum arms (20) generates swivelling of the further pendulum arms (31).
4. The winder according to claim 1, wherein the gear generates swivelling of the pendulum arms (20) relative to the further pendulum arms (31) at a ratio of 1:1.5.
5. The winder according to one of claims 1 to 4 with a machine control, which is operatively connected to the means for maintaining the set value of the wrapping angle (α) and configured to control these during winding of a roll (18) such that the wrapping angle (α) comprises continuously the respective set value.
6. The winder according to one of claims 1 to 4, wherein the means, while winding of the roll continues until a finished roll is obtained, are configured for a set wrapping angle (α) value of 90° or less.
7. The winder according to claim 6, wherein the means, while winding of the roll continues until a finished roll is obtained, are configured for a set wrapping angle (α) value of 45° or less, preferably 20° or less, especially preferably 10° or less.
8. A winder for producing a roll (18) from a material web (5) of flexible material, which is guided over a contact roller (19) of the winder and is wound in the same to form a roll (18), wherein the contact roller (19) during winding stays in contact with the roll (18), wherein the wrapping angle (α) of the material web (5) moving over the contact roller (19) during progressive winding, is held continuously at a variable set value predefined for the respective roll, with a device for supporting the roll (18) to be wound, wherein in operation the contact roller (19) touches the roll (18) during winding, wherein means are provided in order to maintain, as winding of the roll (18) progresses, a changeable set value, which can be predefined for the respective roll, for the wrapping angle (α) of the material web (5) moving over the contact roller (19), wherein the means comprise an auxiliary roller (30), over which the material web is guided in operation, and wherein the auxiliary roller (30), during winding, is arranged so as to be movable relative to the contact roller (19), such that in operation the material web running off the auxiliary roller (30) runs, depending on the respective position of the auxiliary roller (30), onto the contact roller (19) at the location of another contact line (41), characterised in that the contact roller (19) and the auxiliary roller (30) are arranged on pendulum arms (60), wherein the auxiliary roller (30) is, as predetermined, movably supported along a section (62) of the pendulum arms.
9. The winder according to claim 8, wherein the auxiliary roller (30) is arranged so as to be steplessly movable relative to the contact roller (19).
10. The winder according to one of claims 8 to 9, wherein the means, while winding of the roll continues until a finished roll is obtained, are configured for a set wrapping angle (α) value of 90° or less.
11. The winder according to claim 10, wherein the means, while winding of the roll continues until a finished roll is obtained, are configured for a set wrapping angle (α) value of 45° or less, preferably 20° or less, especially preferably 10° or less.
12. A winder for producing a roll (18) from a material web (5) of flexible material, which is guided over a contact roller (19) of the winder and is wound in the same to form a roll (18), wherein the contact roller (19) during winding stays in contact with the roll (18), wherein the wrapping angle (α) of the material web (5) moving over the contact roller (19) during progressive winding, is held continuously at a variable set value predefined for the respective roll, with a device for supporting the roll (18) to be wound, wherein in operation the contact roller (19) touches the roll (18) during winding, wherein means are provided in order to maintain, as winding of the roll (18) progresses, a changeable set value, which can be predefined for the respective roll, for the wrapping angle (α) of the material web (5) moving over the contact roller (19), wherein the means comprise an auxiliary roller (30), over which the material web is guided in operation, and wherein the auxiliary roller (30), during winding, is arranged so as to be movable relative to the contact roller (19), such that in operation the material web running off the auxiliary roller (30) runs, depending on the respective position of the auxiliary roller (30), onto the contact roller (19) at the location of another contact line (41), characterised in that the auxiliary roller (30) is supported, via a carriage (56), on rails (57) so as to be horizontally movable, and wherein the contact roller (19) is supported on a multi-joint suspension (50), which has levers (52) supported on joints (51), which themselves, via joints (53), carry support arms (54), on which the contact roller (19) is supported, so that during operation of the winder the contact roller (19) is movable along a straight.
13. The winder according to one of claims 12, wherein the means, while winding of the roll continues until a finished roll is obtained, are configured for a set wrapping angle (α) value of 90° or less.
14. The winder according to claim 13, wherein the means, while winding of the roll continues until a finished roll is obtained, are configured for a set wrapping angle (α) value of 45° or less, preferably 20° or less, especially preferably 10° or less.

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