Sleeve with tearing aid

Abstract

The invention relates to a sleeve (1) for receiving a filling product, wherein the sleeve (1) has a proximal end (2) and a distal end (4), as well as a sleeve wall (5) extending between the proximal end (2) and the distal end (3) and delimiting a receiving space (4) for the filling product, wherein the sleeve wall (5) comprises an inner side (6) facing the receiving space (4) and an outer side (7) facing away from the receiving space (4), and wherein the sleeve (1) is produced as a wound sleeve made of a material comprising fibres, characterised in that the sleeve (1) comprises a tearing aid in the form of a material weakening (8) that extends from the distal end (3) into the sleeve wall (5). The invention further relates to a method for producing such a sleeve (1).

Description

[0001] .Sleeve with tear-off aid'

[0002] Description

[0003] The invention relates to a sleeve for receiving a filling material. The invention also relates to a method for producing such a sleeve.

[0004] For both professional and home use, various viscous materials, such as silicone, acrylic, and adhesives, are supplied in cartridges, from which the material can be dispensed using a cartridge gun. Commercially available cartridges are often made of thick-walled plastic.

[0005] As environmental and sustainability awareness increases, there are increasing efforts to replace thick-walled plastic cartridges with a combination of foil bags that store the viscous material and sleeves made of a more sustainable and easily recyclable material, such as cardboard, that hold the foil bags.

[0006] For example, DE 91 16 065 describes a device for processing materials packaged in film tubes. A film tube filled with a viscous material is enclosed in an outer sleeve made of several layers of paper, spirally wound, which in turn can be inserted into a standard cartridge gun. The plastic content of such systems is significantly reduced compared to conventional cartridges. After emptying, the outer sleeve can be separated from the film bag, and both components can be fed into the respective recycling streams.

[0007] For efficiency and user-friendliness, it is essential that the plastic and paper components can be separated as completely and easily as possible. This is especially true for applications in trades and on construction sites, where such cartridges are used in large numbers and a correspondingly large amount of waste is generated. Only if the plastic and paper components can be separated quickly and easily can one assume that the majority of users will actually do so.

[0008] For this purpose, solutions are already known, for example from EP 3 936 455 B1, in which a tear line or tear strip is provided in the circumferential direction of the sleeve. By separating the sleeve along the tear line or tear strip, the sleeve can be separated into a proximal section and a distal section. The larger of the two sections can subsequently be recycled, while the smaller section of the sleeve generally remains connected to the emptied foil bag, the piston, and the nozzle element of the cartridge and can be disposed of with residual waste.

[0009] A disadvantage of this solution is that the smaller section of the sleeve cannot be separated from the emptied foil bag, the piston and the nozzle element only with difficulty and is therefore generally lost for paper recycling.

[0010] In addition, the introduction of a tear line or two tear lines delimiting a tear strip in the circumferential direction of the sleeve is complex and sometimes carries the risk that the sleeve will be deformed during this process.

[0011] The present invention therefore aims to provide a sleeve for holding a filling material that can be opened particularly easily after emptying and, at the same time, can be manufactured in a simple manner. A further object of the invention is to propose a method for producing such a sleeve.

[0012] This object is achieved by a sleeve having the features of patent claim 1 and by a method having the features of patent claim 11.

[0013] Advantageous embodiments and further developments of the invention are the subject of the dependent claims.

[0014] According to claim 1, the invention relates to a sleeve for receiving a filling material, wherein the sleeve has a proximal end and a distal end and a sleeve wall extending between the proximal end and the distal end and delimiting a receiving space for the filling material, wherein the sleeve wall comprises an inner side facing the receiving space and an outer side facing away from the receiving space, and wherein the sleeve is manufactured as a winding sleeve from a material comprising fibers. The invention is characterized in that the sleeve comprises a tear-open aid designed as a weakened material, which extends from the distal end into the sleeve wall.

[0015] In other words, the invention provides a tear-open aid for easier tearing open of the sleeve and thus for easier separation of the sleeve from plastic components arranged in the sleeve, for example, an emptied film tube. This tear-open aid does not extend in the circumferential direction of the sleeve but rather from the distal end of the sleeve into the sleeve wall. The tear-open aid is designed as a weakened portion in the material of the sleeve wall. According to the invention, the sleeve is made from a material comprising fibers. For example, it can be made from a material based on plant fibers, in particular from paper or cardboard.

[0016] For the purposes of the invention, the proximal end of the sleeve is generally understood to be the discharge end of the sleeve, i.e., the end through which the filling material stored within the sleeve is discharged. Accordingly, the distal end is generally understood to be the end of the sleeve opposite the proximal end.

[0017] The core is made of a fiber-containing material, such as paper or cardboard, as a winding core. To form the core, a strip of paper or cardboard is wound spirally in several layers and glued together. The edge where the various winding layers of the paper or cardboard strip meet and which extends spirally along the length of the core is also referred to below as the spiral line.

[0018] The material weakening provided according to the invention, which extends from the distal end of the sleeve into the sleeve wall, serves as a starting aid for tearing open the sleeve. In this process, the material of the sleeve wall is initially torn by a user, starting at the material weakening, until the resulting tear line meets the spiral line of the winding sleeve. The sleeve can then be easily separated along the spiral line by further pulling on the paper or cardboard strip. The spiral line acts like a predetermined breaking point that can be separated with little force. In particular, this makes it possible to separate the sleeve from the distal end to the proximal end and subsequently to separate the entire material of the sleeve from components made of other materials, such as a film tube, a piston and / or a nozzle tip.The core material can thus be completely recycled. The weakening of the material is designed in such a way that it never completely coincides with the spiral line.

[0019] According to one embodiment of the invention, the material weakening extends from the distal end essentially in a direction parallel to the longitudinal axis L of the sleeve over a length of 0.5 cm to 1.2 cm. Thus, only a comparatively short length of the material weakening is required to subsequently completely tear and separate the material of the sleeve wall.

[0020] One embodiment of the invention provides that the material weakening is designed as an incision which extends essentially in a direction parallel to the longitudinal axis L of the sleeve. In other words, with the aid of a suitable cutting tool, for example a knife or a saw blade, a short incision, for example approximately 1 cm long, is made in the sleeve wall starting from the distal end. In this case, it is generally not necessary to align the sleeve in a special way for the cutting step in the circumferential direction. Rather, the incision can be made at any point along the circumference of the sleeve. Depending on the orientation of the sleeve, it is possible that the cut made already hits the spiral line, which subsequently makes tearing open the sleeve particularly easy.But even in cases where the cut doesn't directly touch the spiral line, the incision facilitates tearing of the core material, allowing the material to be easily separated in the manner described above. The width of the incision can range from approximately 0.1 mm to 0.8 mm. Generally, it is desirable to keep the cut width as narrow as possible, for example, to minimize the risk of moisture penetrating the core wall material via the cut edges.

[0021] The material weakening can also extend at a certain angle to the longitudinal axis L of the sleeve. Furthermore, the material weakening can also be designed as a perforation.

[0022] One embodiment of the invention provides that the distal end of the sleeve is covered by a material section that abuts both a portion of the inside and a portion of the outside of the sleeve wall, with the material weakening being formed both in the sleeve wall and in the material section. Such material sections, for example made of paper, are used to protect the end abutting edges of the sleeve from moisture penetrating the material of the sleeve wall, since penetrating moisture causes the cellulose fibers in the paper material to swell. This can lead to the sleeve becoming deformed, losing its geometry and stability, and possibly becoming unusable.By covering the abutting edges, in particular the abutting edge at the distal end of the sleeve, with a section of material, the penetration of moisture can be prevented or at least reduced for a significant period of time.

[0023] Such a material section can, for example, be strip-shaped, cover at least one butt edge of the sleeve, and extend over a maximum of 10% of the sleeve's length. The material section extends in a narrow area adjacent to the butt edge along both the inside and outside of the sleeve wall. It can be provided that the material section is glued to the inside and / or outside of the sleeve wall, possibly only at specific points.

[0024] The material weakening is formed both in the sleeve wall and in the material section. In other words, during the production of such a sleeve, the material section is first applied to the sleeve, covering the abutting edge, and then the material weakening, for example in the form of an incision, is introduced into the composite of the sleeve wall and the material section, as described above.

[0025] An alternative and particularly efficient design variant from a manufacturing technology perspective provides for the material section to essentially completely cover the outside of the sleeve wall, wherein the material section is printed at least in part and functions as a label. Such a material section extends over the entire length of the sleeve and is guided over the two abutting edges of the sleeve into the receiving space in such a way that it rests at least in part against the inside of the sleeve wall. An advantage of this design is that by applying the printed material section to the sleeve, both the abutting edge protection and the label carrying the product information are applied in a single production step. The material weakening is introduced into the composite of sleeve wall and material section after the material section has been applied.

[0026] In an alternative embodiment of the invention, the material weakening is designed as a recess in the sleeve wall, wherein the recess is delimited by two edge sections which extend at a distance from one another and at different angles from the distal end into the sleeve wall such that they meet at a point P, wherein point P is at a maximum distance of 1.2 cm from the distal end. In this embodiment, the material weakening is therefore not designed as a narrow incision but as a small, flat material cutout in the sleeve wall. The recess can be formed, for example, by making two incisions in the sleeve wall that converge from the distal end and meet at a point P, such that a substantially triangular region is cut out of the sleeve wall. The recess can also be formed by punching.Point P is at a maximum distance of 1.2 cm from the distal end. The two edge sections can have a distance d of 0.3 cm to 0.8 cm from each other at the distal end.

[0027] According to one embodiment, the distal end of the sleeve, which is provided with a material weakening formed as a recess, is covered by a material section which rests both on a section of the inside and on a section of the outside of the sleeve wall, wherein the material weakening is formed only in the sleeve wall and the material section covers the distal end of the sleeve provided with the material weakening.

[0028] In other words, this embodiment can also provide for a material section to be applied as edge protection, particularly to the distal end of the sleeve. However, in this case, the material weakening is only formed in the sleeve wall and not in the material section. Otherwise, there would be a risk that, in the edge regions bordering the recess and exposed as cut edges, too much moisture would be introduced into the material of the sleeve wall under unfavorable ambient conditions. In this embodiment, the recess is thus completely covered by the applied material section, whereby tearing of the material of the sleeve wall, including the overlying material section, in the region of the recess is possible without difficulty.

[0029] According to the invention, the sleeve can have a marking that indicates the tear-open aid. This is particularly advantageous in embodiments in which the material weakening is covered by a material section and is not immediately visible. However, a marking can also indicate the tear-open aid in embodiments in which the material weakening is designed, for example, as an incision penetrating the sleeve wall and the material section. Such a marking can be arranged, for example, on the inside of the sleeve wall directly on the material of the sleeve wall or on the material section covering the distal end of the sleeve adjacent to the material weakening. The marking can be applied, for example, by inkjet printing and essentially simultaneously with the step of introducing the material weakening.Providing a marking makes it easier for the user to quickly locate the material weakening and thus supports him in separating the different materials.

[0030] According to the invention, the sleeve can comprise a label that essentially completely covers the outer side of the sleeve wall. In the embodiment described above, in which a printed material section extends over the entire length of the sleeve and is guided over the two abutting edges of the sleeve into the receiving space, this material section already functions as a label. However, in embodiments in which no material section or only a narrow, strip-shaped material section covering the distal end of the sleeve is provided, the sleeve can comprise an additional label that essentially completely covers the outer side of the sleeve wall.

[0031] The sleeve according to the invention is suitable, for example, for holding a film tube filled with a viscous material and can be used to dispense the viscous material into a commercially available cartridge gun. However, the sleeve according to the invention can also be used for other applications, for example, as a receptacle for a solid or semi-solid adhesive in a glue stick and thus as a replacement for the otherwise conventional plastic sleeve. After the glue stick has been emptied, the outer sleeve can be completely torn open according to the above statements and disposed of separately from the plastic components of the screw mechanism. According to claim 11, the invention also relates to a method for producing a sleeve according to one of claims 1 to 10, comprising the following steps:

[0032] Providing a winding core made of a material comprising fibers;

[0033] Introducing a material weakening into the sleeve wall with the aid of a cutting tool, wherein the material weakening extends from the distal end into the sleeve wall.

[0034] It can be provided that at the same time as a material weakening is introduced into the sleeve wall, a marking indicating the material weakening is applied to the inside of the sleeve wall, for example by inkjet printing.

[0035] In a further embodiment of the method according to the invention, it can be provided that, before the material weakening is introduced, a material section is applied to the winding tube, which covers the distal end of the winding tube and which rests both on a section of the inside and on a section of the outside of the tube wall, wherein the subsequently introduced material weakening penetrates both the tube wall and the material section, and wherein the marking is applied to the area of ​​the material section which rests on the inside of the tube wall.

[0036] The material weakening can, for example, be in the form of an incision. In an alternative embodiment of the method, the material weakening can be in the form of a recess in the sleeve wall, which is delimited by two edge sections which extend at a distance from one another and at different angles from the distal end into the sleeve wall such that they intersect at a point P, wherein point P is at a maximum distance of 1.2 cm from the distal end, and wherein in a subsequent method step a material section is applied to the winding sleeve which covers the distal end of the winding sleeve including the recess and which rests against both a section of the inside and a section of the outside of the sleeve wall, wherein the material section has a marking which indicates the position of the recess.

[0037] Finally, it can be provided that, in a final process step, a label is applied to the sleeve, which essentially completely covers the outer side of the sleeve wall. If the distal end of the sleeve is covered with a material section acting as a butt edge protector, the label is preferably arranged on the sleeve in such a way that it at least partially covers the portion of the material section adjacent to the outer side of the sleeve wall.

[0038] The invention is explained in more detail below using exemplary embodiments and with reference to the accompanying drawings. Figures 1a and 1b show a sleeve according to the invention in a first embodiment in different perspective views;

[0039] Figures 2a, 2b: a sleeve according to the invention in a second embodiment in different perspective views;

[0040] Figures 3a, 3b: a sleeve according to the invention in a third embodiment in different perspective views;

[0041] Figures 4a, 4b, 4c: a sleeve according to the invention in further embodiments in perspective view;

[0042] Figures 5a, 5b, 5c: Process of tearing open a sleeve according to the invention.

[0043] Figures 1a and 1b show a sleeve, designated as a whole by 1, for holding a filling material. The sleeve 1 is made as a winding sleeve from a paper material and can, for example, serve to hold a film tube filled with a viscous material and be used as a cartridge in a cartridge gun. To form the sleeve 1, a paper or cardboard strip is wound spirally over one another in several layers and glued accordingly. The butt edge, at which the various wound layers of the paper or cardboard strip abut one another and which extends spirally over the length of the sleeve 1, is referred to as the spiral line 16.

[0044] The sleeve 1 has a proximal end 2 and a distal end 3, as well as a sleeve wall 5 extending between the proximal end 2 and the distal end 3 and defining a receiving space 4 for the filling material. The proximal end 2 is generally the discharge end of the sleeve 1, to which, for example, a suitable nozzle element can be connected, while a piston can be inserted at the distal end 3, with the aid of which the filling material can be expelled. The sleeve wall 5 comprises an inner side 6 facing the receiving space 4 and an outer side 7 facing away from the receiving space 4.

[0045] Starting from the distal end 3, a material weakening 8 designed as an incision 9 extends into the sleeve wall 5. The incision 9 has a length of approximately 1 cm and a cutting width of approximately 0.5 mm and extends essentially in a direction parallel to the longitudinal axis L of the sleeve 1. The incision 9 serves as a tear-open aid for tearing open the sleeve 1 after the contents have been emptied. As soon as the emptying is complete, a user can easily tear the sleeve wall 5 of the sleeve 1, starting at the material weakening 8, until the tear line created in the material of the sleeve wall 5 meets the spiral line 16. The sleeve 1 can then be easily separated along the spiral line 16 by further pulling on the paper or cardboard strip. The spiral line 16 acts like a predetermined breaking point, which can be separated with little force.This process is illustrated in Figures 5a to 5c for a further exemplary embodiment, which will be explained in more detail below. This makes it possible to completely separate the sleeve 1 from the distal end 3 to the proximal end 2, and subsequently separate the entire material of the sleeve 1 from components made of other materials, such as a film tube, a piston, and / or a nozzle tip. The sleeve material can thus be completely recycled.

[0046] An arrow-shaped marking 14, applied by inkjet printing to the inner side 6 of the sleeve wall 5, indicates the tear-off aid. The provision of such a marking 14 makes it easier for the user to quickly locate the weakened area in the material and thus assists them in separating the different materials.

[0047] Figures 2a and 2b show an embodiment of the invention in which the sleeve 1 comprises a label 15 that essentially completely covers the outer side 7 of the sleeve wall 5. In the embodiment shown here, the label 15 extends to within a few millimeters of the proximal end 2 and the distal end 3 of the sleeve 1. The label 15 can be provided with product information in the usual way, for example, by printing.

[0048] From a manufacturing perspective, the label 15 can first be applied to the outer side 7 of the sleeve wall 5 before, in a subsequent step, the incision 9 is introduced into the composite of the sleeve wall 5 and the label 15. In principle, it is also possible to first make the incision 9 into the material of the sleeve wall 5 and then apply the label 15 to the outer side 7 of the sleeve wall 5. In the latter case, it is particularly advantageous if a marking 14 on the inner side 6 of the sleeve wall 5 indicates the tear-open aid, since this can be at least partially covered by the label 15.

[0049] In a variant embodiment not shown in the figures, the label 15 can also be designed so large that it extends beyond the proximal end 2 and the distal end 3 of the sleeve 1 and is folded inwards over these two ends into the receiving space 4 and brought into contact with the inner side 6 of the sleeve wall 5. With such a configuration, the material weakening 8 is advantageously only introduced into the composite of sleeve wall 5 and label 15 after the label 15 has been applied. Figures 3a and 3b show a further embodiment of the invention. Here, only the distal end 3 of the sleeve 1 is covered by a narrow, strip-shaped material section 13. The material section 13 covers the lower abutting edge of the sleeve 1 and rests in a narrow area on the outer side 7 and the inner side 6 of the sleeve wall 5, which is particularly evident in Figure 3b.The material section 13 serves to protect the otherwise exposed butt edge of the sleeve 1 at the distal end 3 from moisture ingress. The material weakening 8, formed as an incision 9, is incorporated into the composite of the sleeve wall 5 and the material section 13. A marking 14 indicating the material weakening 8 is printed on the inner side 6 of the sleeve wall 5 on the material section 13.

[0050] A sleeve 1 according to Figures 3a, 3b can additionally comprise a label 15, not shown here, which essentially completely covers the outer side 7 of the sleeve wall 5 in the manner described above and can also at least partially cover the material section 13.

[0051] Figures 4a, 4b, 4c show further embodiments of the invention in which the material weakening 8 is formed as a recess 10 in the sleeve wall 5. The recess 10 is delimited by two edge sections 11, 12 which extend at a distance from one another and at different angles from the distal end 3 into the sleeve wall 5 such that they meet at a point P. The recess 10 thus has a triangular shape. The point P is at a distance of approximately 1 cm from the distal end 3, and the two edge sections 11, 12 are at a distance d of approximately 0.6 cm from one another in the region of the distal end 3. In addition, the distal end 3 of the sleeve can be covered by a material section 13, which can be seen in Figure 4c. Figure 4b shows how the material section 13 is applied to a sleeve according to Figure 4a.As already described above for the embodiment of Figures 3a, 3b, the material section 13 covers the lower abutting edge of the sleeve 1 and rests in a narrow area on the outer side 7 and on the inner side 6 of the sleeve wall 5.

[0052] In the embodiment of Figures 4a-4c, due to the size of the recess 10, it is advantageous if the recess 10 is formed only in the sleeve wall 5, but not in the material section 13, since otherwise there would be a comparatively high risk of moisture ingress into the material of the sleeve wall 5 via the edge regions 11, 12. For this reason, the material section 13 advantageously covers the distal end 3 of the sleeve 1, including the recess 10. In this case, a marking 14 can be arranged on the material section 13, for example in the form of a color-contrasting stripe, as shown in Figures 4b, 4c. When applying the material section 13 to the distal end 3, care must be taken to ensure that the material section 13 is aligned such that the marking 14 lies so as to cover the recess 10, as indicated in Figure 4c.A user is thus immediately informed in which area of ​​the distal end 3 the tearing of the material of the sleeve wall 5 can occur without great expenditure of force in the manner described above.

[0053] A sleeve 1 according to Figure 4c can additionally comprise a label 15, not shown here, which essentially completely covers the outer side 7 of the sleeve wall 5 in the manner described above and can also at least partially cover the material section 13.

[0054] Figures 5a-5c schematically illustrate the process of tearing open a sleeve 1 according to the invention. Figure 5a shows an exemplary embodiment of a sleeve 1 as explained in connection with Figure 4a. It differs from the exemplary embodiment in Figure 4a only in that point P of the recess 10 already lies directly on the spiral line 16 of the sleeve 1. Pulling or tearing at the free end 17 of the sleeve wall 5 thus directly leads to a separation of the material of the sleeve wall 5 along the spiral line 16 acting as a predetermined breaking point, as indicated in Figure 5b, until finally the entire material of the sleeve wall 5, starting from the distal end 3 and extending to the proximal end 2, is separated, see Figure 5c.In this way, the material of the sleeve wall 5 can be completely separated from components made of other materials, for example from a film tube, a nozzle element and a piston, and the different materials can be fed to the respective recycling streams.

Claims

1 . Sleeve (1) for receiving a filling material, wherein the sleeve (1) has a proximal end (2) and a distal end (3) and a sleeve wall (5) extending between the proximal end (2) and the distal end (3) and delimiting a receiving space (4) for the filling material, wherein the sleeve wall (5) comprises an inner side (6) facing the receiving space (4) and an outer side (7) facing away from the receiving space (4), and wherein the sleeve (1) is manufactured as a winding sleeve from a material comprising fibers, characterized in that the sleeve (1) comprises a tear-open aid designed as a material weakening (8), which extends from the distal end (3) into the sleeve wall (5).

2. Sleeve (1) according to claim 1, characterized in that the material weakening (8) extends from the distal end (3) substantially in a direction parallel to the longitudinal axis L of the sleeve (1) over a length of 0.5 cm to 1.2 cm.

3. Sleeve (1) according to claim 1 or 2, characterized in that the material weakening (8) is designed as an incision (9) which extends substantially in a direction parallel to the longitudinal axis L of the sleeve (1).

4. Sleeve (1) according to one of claims 1 to 3, characterized in that the distal end (3) of the sleeve (1) is covered by a material section (13) which bears against both a section of the inside (6) and a section of the outside (7) of the sleeve wall (5), wherein the material weakening (8) is formed both in the sleeve wall (5) and in the material section (13).

5. Sleeve (1) according to claim 4, characterized in that the material section (13) essentially completely covers the outer side (7) of the sleeve wall (5), wherein the material section (13) is printed at least in some areas and has the function of a label.

6. Sleeve (1) according to claim 1 or 2, characterized in that the material weakening (8) is designed as a recess (10) in the sleeve wall (5), wherein the recess (10) is delimited by two edge sections (11) and (12) which extend at a distance from one another and at different angles from the distal end (3) into the sleeve wall (5) in such a way that they meet at a point P, wherein the point P is at a maximum distance of 1.2 cm from the distal end (3).

7. Sleeve (1) according to claim 6, characterized in that the two edge sections (11) and (12) at the distal end (3) have a distance d of 0.3 cm to 0.8 cm from each other.

8. Sleeve (1) according to claim 6 or 7, characterized in that the distal end (3) of the sleeve (1) is covered by a material section (13) which bears against both a section of the inner side (6) and a section of the outer side (7) of the sleeve wall (5), wherein the material weakening (8) is formed only in the sleeve wall (5) and the material section (13) covers the distal end (3) of the sleeve (1) provided with the material weakening (8).

9. Sleeve (1) according to one of claims 1 to 8, characterized in that the sleeve (1) has a marking (14) indicating the tear-open aid.

10. Sleeve (1) according to one of claims 1 to 9, characterized in that the sleeve (1) comprises a label (15) which substantially completely covers the outer side (7) of the sleeve wall (5). 1 1. A method for producing a sleeve (1) according to one of claims 1 to 10, comprising the following steps: Providing a winding core made of a material comprising fibers; Introducing a material weakening (8) into the sleeve wall (5) with the aid of a cutting tool, wherein the material weakening (8) extends from the distal end (3) into the sleeve wall (5).

12. Method according to claim 11, characterized in that at the same time as a material weakening (8) is introduced into the sleeve wall (5), a marking (14) indicating the material weakening (8) is applied to the inside (6) of the sleeve wall (5).

13. The method according to claim 12, characterized in that before the material weakening (8) is introduced, a material section (13) is applied to the winding sleeve, which covers the distal end (3) of the winding sleeve and which rests both on a section of the inside (6) and on a section of the outside (7) of the sleeve wall (5), wherein the subsequently introduced material weakening (8) penetrates both the sleeve wall (5) and the material section (13) and wherein the marking (14) is applied to the area of the material section (13) which rests on the inside of the sleeve wall (5).

14. Method according to claim 11, characterized in that the material weakening (8) is formed in the form of a recess (10) in the sleeve wall (5), which two edge sections (11) and (12) which extend at a distance from one another and at different angles from the distal end (2) into the sleeve wall (5) in such a way that they intersect at a point P, the point P being at a maximum distance of 1.2 cm from the distal end (3), and wherein in a subsequent method step a material section (13) is applied to the winding sleeve, which covers the distal end (3) of the winding sleeve including the recess (10) and which bears against both a section of the inside (6) and a section of the outside (7) of the sleeve wall (5), the material section (13) having a marking which indicates the position of the recess (10).

15. Method according to one of claims 11 to 14, characterized in that in a final method step a label (15) is applied to the sleeve (1), which substantially completely covers the outer side (7) of the sleeve wall (5).

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