EP3802386A1

EP3802386A1 - Sleeve, winding device, and method for repeated, successive winding of webs to form reels of material

Info

Publication number: EP3802386A1
Application number: EP19726979.8A
Authority: EP
Inventors: Fabian Sundermann; Frank Hoffmann; Ralf MENKE
Original assignee: Windmoeller and Hoelscher KG
Current assignee: Windmoeller and Hoelscher KG
Priority date: 2018-05-24
Filing date: 2019-05-24
Publication date: 2021-04-14
Also published as: US12091271B2; US20210380362A1; WO2019224370A1

Abstract

The invention describes a sleeve for sliding onto and removing from a winding shaft, which comprises a one-piece workpiece defining a cylinder, which workpiece comprises two edge regions each having an edge, the edge regions overlapping one another, the sleeve having a first diameter in a relaxed state, the sleeve in a clamped state having a second diameter which is different from the first diameter, the sleeve in the clamped state experiencing an elastic deformation as compared to the relaxed state.

Description

Sleeve, winding device and method for multiple,

successive winding of webs to material wraps

The invention relates to a sleeve for multiple, successive winding of webs to material coils and a winding device comprising such a sleeve.

The prior art is to unwrap it film and webs on cores, these webs remain for further transport and further processing on the winding tube. These can be made of cardboard, plastic or metal, with cardboard being the most common application. To reduce material costs and waste, there are approaches to wrap coreless. In this case, the material is wound directly onto a winding shaft, which can be reduced in diameter after completion of the winding process in the outer diameter. At the moment of reduction the innermost layers of a coil take over a supporting function of a sleeve. Winding shafts known in the prior art generally have the embodiment shown below.

In these winding shafts, three or more shells are arranged on the circumference. These can be brought by inflating an air hose inside the winding shaft core to a larger diameter. In this state, the film is wound up. After completion of the winding process, the air is released and the shells retract by spring force to their original, smaller diameter. In this condition, the inner layers of the roll carry the film wrap and it arises a gap to the winding shaft. Thus, the finished roll can be pulled by the winding shaft.

However, this solution has two major disadvantages. The clamping elements are heavy and significantly reduce the load-bearing cross-section of the winding shaft. This means straight for 2 "applications (2" is the outer diameter of the cores) low working widths and / or low line speeds.

The second disadvantage is gaps that result in an expanded winding shaft between the shells. There presses foil while winding. This complicates the impanding of the shells after winding, which reduces the process reliability of the peeling. In addition, the impressions are visible through the gaps inside the roll, which is a negative quality mark.

There are also known coreless winding shafts, which consist of a tube with many holes. There, after winding on the tube with air pressure, an air cushion is built up between the tube and the coil, which makes it possible to pull it off. However, this method does not work very reliably.

The object of the present invention is therefore to propose an arrangement and a winding device as well as a method in which the aforementioned disadvantages are eliminated or at least reduced.

According to the invention this object is achieved by all features of claim 1.

The idea is based on a standard winding shaft for conventional cores, which can be used by pushing a sleeve according to the invention to a coreless winding shaft convertible and / or without conversion. Preferably, the standard winding shaft comprises adjusting elements, which are displaceable relative to the winding shaft, wherein a component of the displacement points radially outward. In order to enable a shift, the adjusting elements are drivable, preferably within the Winding shaft, a pressure chamber and / or a flexible hose are provided. For example, a pressure chamber may be filled with a fluid which is pressurized to displace the control elements. A flexible hose can also be pumped up in a simple manner, ie be charged with a larger volume of fluid.

By pushing and attaching a very thin-walled spiral sleeve, this shaft becomes a coreless winding shaft. This sleeve consists of a one-piece, cylindrical shell, which comprises two edge regions which overlap to form an overlapping region. At rest, this sleeve preferably has an inner diameter that is smaller than, equal to or only minimally larger (max 5 mm) than the outer diameter of the winding shaft. This gives a nearly circular surface, which can be brought by clamping and relaxing in different diameters. In this case, the sleeve has a first diameter in the relaxed state. Now, if the adjusting elements - with a radial component of movement to the outside - moves, the sleeve is transferred to a tensioned state, wherein the overlap region is reduced. One can also speak of the fact that the mutual shortest distance between the two edges decreases. In this tensioned state, the sleeve has a second diameter, wherein this second diameter deviates from the first diameter. In particular, the second diameter is greater than the first diameter.

The material is elastic, d. h., It returns after relaxing in its original position and resumes its initial geometry.

To have a sufficient bias on the winding shaft, a sleeve according to the invention may have an inner diameter which is smaller than the outer diameter of the winding shaft. Thus, the inner diameter of the sleeve can be up to 10%, preferably up to 5%, smaller than the outer diameter of the winding shaft. With inner diameter of the sleeve, the diameter is meant, which assumes the sleeve when it is not pushed onto the winding shaft. With such an inner diameter ensure that the sleeve also returns from the tensioned state to the relaxed state.

Travel limiters and / or force limiters can act on the adjusting elements within the winding shaft, wherein the travel limiters and / or force limiters are in particular adjustable. In this way, the path of the adjusting elements in the radial direction can be limited to the outside, so that the second diameter assumes a desired value. In conventional cores such Wegbegrenzer or force limiters are not necessary because a well-known from the prior art sleeve already limited the way or the force by their strength.

A significant advantage of the invention is that it can be wound with a winding shaft both with and without conventional cores. Only the sleeve according to the invention must be postponed. That reduces

Reconstruction times and high initial costs due to two complete winding shafts.

Another very important advantage of the invention is the absence of gaps in the stressed state. This results in a substantially round interior of the material wrap. This is a quality feature for the sale of material wraps.

In an advantageous embodiment of the invention, it is provided that the edges of the sleeve extend parallel to the main axis of inertia of the sleeve. In this case, the edges are parallel to the axis of rotation of the winding shaft when the sleeve is pushed onto this. Preferably, the sleeve is thereby applied to the winding shaft, that the resting in the region of the overlap edge seen in the direction of rotation of the winding shaft is located at the rear end of the sleeve. In this case, behind the running edge of the sleeve, the front end of the web can be placed when it is rewound. Thus, the shock that occurs after each revolution of the winding shaft, when the material web meets the web start, be reduced, so that a more uniform winding is formed. This is advantageous even with thin material webs. In another advantageous embodiment, the edges extend at an angle to the main axis of inertia of the sleeve, in particular spirally. With such an embodiment, an imbalance of the sleeve can be reduced or even avoided.

In addition, it is advantageous if the material of the sleeve comprises carbon fiber reinforced plastic (CFRP). In particular, the sleeve can be made entirely of this material. A sleeve that includes CFRP can be very thin-walled. This imbalance of the stocked with the sleeve winding shaft can be avoided, the winding shaft thus runs around, which is particularly advantageous at high winding speeds. The high strength of this material also causes the outer circumference to maintain a very good circular shape as the diameter increases, which has a positive effect on the quality of the roll.

In an alternative or additional embodiment of the invention it is provided that the material of the sleeve comprises at least partially steel, in particular spring steel. With this material very inexpensive sleeves can be produced.

The above object is also achieved by a winding device and a sleeve for successively winding material web sections to material wraps, the material winder having direct contact with the sleeve, wherein the material wraps are displaceable relative to the sleeve, wherein the sleeve during the displacement of the material roll relative to the winding core remains in a fixed position, wherein the sleeve is configured according to one or more of the above-described embodiments of the invention.

Furthermore, we achieved the above-mentioned object by a method for successively winding the material web sections to material wraps, wherein A sleeve is placed on a winding core or, while the sleeve is in a relaxed state with a first diameter,

The sleeve is transferred to a tensioned state having a second diameter, wherein the second diameter is greater than the first diameter,

• The web portion is wound up to form the material roll on the sleeve

• the sleeve is returned to the relaxed state,

The material roll is withdrawn from the sleeve,

wherein the method is characterized in that the sleeve comprises a one-piece workpiece circumscribing a cylinder, which comprises two edge regions, each having an edge, wherein the edge regions overlap, wherein during the transfer of the sleeve from the relaxed state to the tensioned state of the distance Margins is reduced.

With this method, the same advantages are achieved as with a winding device according to the invention and / or a sleeve according to the invention. The sleeve can remain in this process on the winding core or be removed with the finished material wrap.

Further advantages, features and details of the invention will become apparent from the following description in which, with reference to the figures, various embodiments are explained in detail. The features mentioned in the claims and in the description may each be essential to the invention individually or for any combination of mentioned features. Within the scope of the entire disclosure, features and details described in connection with the sleeve according to the invention apply, of course also in connection with the method according to the invention and / or the device according to the invention and in each case vice versa, so that with respect to the disclosure of the individual aspects of the invention always Mutual reference is or can be made. The individual figures show: Fig. 1 A coreless winding shaft according to the prior art

Fig. 2 As Figure 1, but with outwardly shifted actuators Fig. 3 cross-section of a winding shaft with a sleeve according to the invention in the relaxed state

Fig. 4 as Figure 3, but in the tensioned state

Fig. 5 Perspective view of the essential components of

FIG. 3

Fig. 6 Perspective view of another embodiment of a sleeve according to the invention

Fig. 7 A provided with a fixing element embodiment of a winding shaft assembly

Fig. 8 A provided with another fixing element

Embodiment of a winding shaft assembly

Fig. 9 A winding device according to the invention

1 shows a section through a so-called coreless winding shaft 1 according to the prior art. Evident is the actual winding shaft, which includes a supporting tube 10. The supporting tube 10 is surrounded by a plurality of shell parts 11, which in its entirety preferably surround the tube 10 concentrically and can rest in the relaxed state on its outer circumference. By means of adjusting elements 12, of which each shell part 11 is associated with at least one, the shell parts 11 can be moved in the radial direction of the supporting tube 10. In order to be able to displace the adjusting element uniformly and simultaneously, at least one force supply device is provided, which in the present FIG. 1 is designed as an expandable cavity, for example as a hose 13. By filling a pressurized fluid, preferably air, this cavity can be expanded in the radial direction and thus pushes the control elements to the outside, which is illustrated by the arrows 14. The state in which the adjusting elements are displaced outwards is shown in FIG. FIG. 3 shows a first embodiment of a sleeve 50 according to the invention in a sectional view. This sleeve can be pushed onto a winding shaft, which likewise comprises a supporting tube 10. Within the supporting tube 10 also adjusting elements 12 and an expandable cavity 13 are provided, whose structure and function are analogous to the prior art. Features which have been described in connection with FIGS. 1 and 2 can accordingly be combined with features which are described in connection with FIGS. 3 to 6 or shown by these figures. The sleeve extends circumferentially around the supporting tube 10, with the sleeve extending through an angle greater than 360 °. In other words, the edge 51 of the sleeve on the outer circumference of the sleeve 50 and the edge 52 of the sleeve on the inner circumference of the sleeve 52. Stated another way, the sleeve 50 overlaps itself in an overlap region, which is represented by the double arrow 53. In this relaxed state, in which the sleeve 50 may have contacting contact with the supporting tube 10, the sleeve 50 has a first diameter D1, it being noted that due to the overlap, the sleeve does not have an ideal circular cross-section.

FIG. 4 now shows the arrangement of FIG. 3, but with adjusting elements 12 displaced outwardly in the radial direction of the supporting tube 10. Moving the adjusting elements again preferably proceeds as in the prior art. During the displacement of the adjusting elements, the parts of the sleeve, which lie one above the other in the overlapping region, move relative to one another. In other words, the edges 51 and 52 approach each other. It can also be said that the overlapping area 53 is reduced. In this tensioned state, the sleeve 50 has a diameter D2 which is greater than the diameter D1.

When the tensioned state is reached, the winding process can now begin and a material roll can be formed on the sleeve 50. If a material roll is finished wound and this must now be removed from the sleeve, the sleeve 50 is again transferred to the relaxed state according to FIG. 3, in FIG which now the diameter D1 of the sleeve 50 is smaller than the inner diameter of the material roll.

FIG. 5 now shows a perspective view of a supporting tube 10 and the sleeve 50 pushed onto it. It can be seen that the edge 51 extends parallel to the main axis of inertia of the sleeve 51, which runs close to or on the axis of rotation of the winding shaft and thus of the supporting tube 10 ,

FIG. 6 now shows a further embodiment of a sleeve 50 according to the invention. The illustration is likewise in perspective. Notwithstanding the embodiment according to FIG. 5, the edge 51 (and thus also the edge 52, not shown) does not run parallel here, but at an angle to the main axis of inertia of the sleeve 50. In other words, the edge 51 runs in a spiral. The circumferential angle of the rim 51 is preferably more than 360 °. Also present but not shown is an overlap area in this embodiment. Also preserved are the properties according to which the edges approach for transferring the sleeve from a relaxed state into a tensioned state, or the overlap area is reduced in size.

In order to avoid an axial displacement of the sleeve 50 relative to the supporting tube 10, in an advantageous embodiment at least one fixing element can be provided which reduces or even prevents said axial displacement. This is particularly important when a finished material wrap is to be removed from the sleeve. It determines without a fix the possibility that the sleeve is moved unintentionally. With an automatic reel change this would require additional intervention to re-fit the sleeve. FIG. 7 shows a first embodiment in which a pin 20 arranged on the supporting sleeve is provided, wherein the pin represents the fixing element. In this case, the sleeve 50 has a complementary hole 60 into which the pin can engage. In order to facilitate sliding of the sleeve 50, the pin 20 may include a run-on slope 21 or be movably disposed on the supporting tube. In the embodiment of Figure 8 is a on the load-bearing tube slidable and fastened there ring 22 is provided. This ring can now carry the fixing element. Such a ring may also be part of a fixing element. The advantage of this embodiment is that the ring is also removable again, so that the winding shaft with conventional winding tubes, which remain connected to the winding with the material wrap, can be used. In the present embodiment, the fixing element may be designed as a screw 23, with which the sleeve is pressed against the supporting tube.

A sleeve according to the invention and a winding shaft explained in the context of this description can together form a winding shaft arrangement according to the invention.

FIG. 9 now shows a winding device 100 according to the invention, which comprises a winding shaft arrangement 101 according to the invention. Via at least one guide roller 103, a material web 102, which is for example a plastic web, can be fed to a contact roller 104. It is preferred if the material web 102 can be pressed against the winding shaft arrangement with the contact roller. The winding device is constructed and operated in such a way that the winding shaft arrangement rotates in the direction R. When a new beginning 105 of a web 102 is supplied to form a new roll, it is advantageous if the beginning 105 seen in the direction R is placed just behind the edge 51 on the sleeve. By "short" is meant an angle range from 0 to a maximum of 30 degrees. In this way, the step 51 resulting from the edge 51, but also the step resulting from the beginning 105, is reduced.

Claims

Windmöller & Hölscher KG

Münsterstrasse 50

49525 Lengerich / Westphalia

May 24, 2019

Our sign: 9374 WO - SCHN

Sleeve, winding device and method for multiple, successive

Winding of webs to material wraps

claims

1. sleeve for sliding on and for withdrawing from a winding shaft, wel che a cylinder circumscribing, one-piece workpiece includes wel Ches two edge regions each having an edge, wherein the edge overlap areas, the sleeve in a relaxed state Ers th diameter, wherein the sleeve has a second diameter in a tensioned state, which differs from the first diameter, wherein the sleeve undergoes an elastic deformation in the tensioned state compared to the relaxed state.

2. Sleeve according to claim 1,

characterized in that

the edges run parallel to the main axis of inertia of the sleeve.

3. Sleeve according to one of the preceding claims,

characterized in that

that the wheels are spiraling to the main axis of inertia of the sleeve.

4. Sleeve according to one of the preceding claims,

characterized in that

the material of the sleeve includes carbon fiber reinforced plastic.

5. Sleeve according to one of the preceding claims,

characterized in that

the material of the sleeve at least partially steel, especially spring steel to summarizes.

6. winding device with a winding core and a sleeve for successively winding material web sections to material winding, the Materialwi ckel have direct contact with the sleeve, wherein the material winding relative to the sleeve are displaceable, wherein the sleeve during the displacement of Mate rialwick relative to the winding core in a fixed position remains

marked by

a sleeve according to any one of claims 1 to 5.

7. A method for successively winding the material web sections to Mate rialwickel, wherein

A sleeve is placed on a winding core or, while the sleeve is in a relaxed state with a first diameter,

• The web portion is wound up to form the material roll on the sleeve

• the sleeve is returned to the relaxed state,

• The material wrap is removed from the sleeve

characterized in that

the sleeve comprises a cylinder circumscribing, one-piece workpiece, which comprises two edge regions, each having an edge, wherein the edge regions overlap, wherein during the transfer of the sleeve from ent spanned state in the tensioned state, the distance of the edges is reduced ness.