Expandable wall section for extraction vessel

Abstract

A wall section (23) for an expandable brewing vessel (20) for containing brewed dry materials for the preparation of an brewed beverage, the brewing vessel, and a method for manufacturing the wall section are disclosed. The wall section (23) has a first end (231) and a second end (232) and further has a deformable tube film (233) connecting the first end (231) and the second end (232). The first end (231) has a mounting ring (50) that is integrally connected to the tube film (233).

Description

[Technical field]

[0001] The present invention relates to a wall section for an expandable extraction vessel, an expandable extraction vessel as well as a method for manufacturing a wall section for an expandable extraction vessel according to the preambles of the independent claims.

[0002] In the context of the present invention, an "extracted beverage" is understood to be any type of beverage that can be prepared starting from an extracted dry substance by contact with a cold or hot extraction liquid. A typical extracted beverage is, for example, tea, which is prepared by pouring hot water over tea leaves or herbs.

[0003] It is known that different types of tea require steeping in hot water for a relatively long time, up to several minutes, to optimally release their aroma, and therefore the contact time between the tea leaves and the extraction water must be sufficiently long.

[0004] From EP 3119245 a tea preparation device and a method are known which allow a metered amount of extraction dry material to be brought into contact with the extraction liquid for a defined contact time. This is made possible by an expandable extraction vessel. To introduce the extraction liquid into the vessel, the cover of this vessel is pierced by a filling needle through which the extraction liquid is introduced into the vessel. To empty the extraction vessel, an outlet valve is provided which opens when a certain overpressure inside the extraction vessel is exceeded. This overpressure is achieved by compressing the vessel with the aid of a thrust piston.

[0005] Depending on the extract dry substance, this may be present in a more or less compressed form. In order to completely moisten the extract dry substance, it must be present in a relatively loose form. For this, the extraction vessel is expandable, so that the extract dry substance can be moistened evenly. In order to be able to expand the volume of the extraction vessel, i.e. to be able to expand the extraction vessel, a bellows is provided in the design according to EP 3119245. In the folded state, the bellows requires a small space and in the extended state, it can provide a relatively large volume. The production of the bellows is relatively laborious and correspondingly expensive. Furthermore, due to the presence of many different production steps, a corresponding number of quality controls must be carried out in order to ensure that the bellows are dense and that the aroma of the extract dry substance present in the bellows is maintained.

[0006] The object of the present invention is to obviate at least one or more of the disadvantages of the prior art. In particular, it is desirable to provide a wall section for an expandable extraction vessel, which can be manufactured simply and particularly advantageously, conserves resources, allows high repeatability in manufacturing, and allows particularly easy expansion.

[0007] This problem is solved by the devices and methods defined in the independent claims. Further embodiments follow from the dependent claims.

[0008] A wall portion according to the present invention for an expandable brewing vessel for containing brewed dry material for the preparation of an brewed beverage has a first end and a second end, the wall portion further having a deformable tube film joining the first end and the second end.

[0009] The first end has a mounting ring which is integrally joined to the tube film.

[0010] A tube film is an element of material having a closed wall extending in an annular shape, which has a relatively small wall thickness in relation to its length or surface extent, which in this case is less than 0.2 mm, preferably less than 0.1 mm, but at least 0.01 mm thick. The tube film preferably has a thickness of exactly 0.1 mm.

[0011] The tube film may in this case be a film made of PET, PEF or a comparable material, and is preferably heat-resistant to temperatures up to 100° C., preferably up to 150° C., in particular up to 200° C. The tube film is in particular plasticizer-free, has a high tensile breaking strength and is highly wrinkle-resistant.

[0012] The tube film may be produced, for example, as a single- or multi-layer blown film; alternatively, the tube film may be rolled and welded.

[0013] By forming a mounting ring at the first end of the tube film, this tube film can be easily connected, for example, to a corresponding bottom part of a brewing vessel.

[0014] This is simplified in particular by the fact that the tube film is formed integrally with the mounting ring, so that it is not necessary to perform a complex clamping operation on the bottom part, but rather the mounting ring is simply connected to a corresponding mating element on the bottom part.

[0015] It may be provided that the second end of the wall part is formed as a cover part of the extraction vessel, which in this case is integrally connected to the tube film.

[0016] In particular, since the second end is formed as a cover part of the extraction vessel by integrally connecting the tube film to the cover part, an additional work step for connecting the tube film to the cover part may be unnecessary.

[0017] Furthermore, the integral bond between the cover part and the tube film makes it possible to simplify the manufacturing process, in particular making it possible to make unnecessary additional quality controls, since it is not necessary to check a separate and / or subsequently performed bond between the tube film and the cover part.

[0018] The same is true for the bond between the tube film and the mounting ring.

[0019] The first end and the second end may be coupled to one another via a helical structure.

[0020] The helical structure increases the stability of the wall part on the one hand and on the other hand may provide an elastic element in the form of a coil spring which aids the opening movement of the expandable extraction vessel during expansion.

[0021] The helical structure may be integrally connected to the tube film, which is thus supported and guided, i.e. connected to the thread of the helical structure and moves together with the thread of the helical structure, and when the extraction vessel is compressed from its expanded to its contracted shape, the tube film is guided by the helical structure and maintains its diameter or slightly increases in diameter in the region of the connection to the helical structure.

[0022] As the extraction vessel is compressed, it may be rotated or twisted slightly so that the outer diameter of the tube film, and therefore the outer diameter of the helical structure, remains constant.

[0023] The joint between the tube film and the cover part and / or the mounting ring and / or the helical structure may be formed as an injection molded joint.

[0024] Due to the formation of the injection-molded joint, an integral connection between the two elements is relatively easy: for example, the injection molding can be carried out around the tube film, which can then be enclosed from two sides, and by injection molding the elements around the tube film or so that they are attached to the tube film, a connection by partial fusion or welding is also possible, so that the surfaces are at least partially interlocked with one another.

[0025] Preferably, the cover portion, mounting ring and helical structure are formed as one unitary piece.

[0026] This makes it possible to avoid further or additional interfaces between the individual elements, which has a positive impact on the defect rate.

[0027] One-piece production is particularly advantageous in injection molding processes.

[0028] All elements that are fabricated together can be formed uniformly and homogeneously.

[0029] The cover part of the wall part may have one or more openings, and a sealing film may be arranged on the cover part to close said openings.

[0030] The openings in the cover allow for material and weight savings.

[0031] Another aspect of the invention relates to an expandable brewing vessel for containing brewed dry material for the preparation of an brewed beverage. The brewing vessel includes a bottom portion, a cover portion, and a wall portion connecting the bottom portion and the cover portion. The wall portion is formed, among other things, as previously described. The wall portion has a variable length. A first end of the wall portion has an integral attachment ring. The wall portion is attached to the bottom portion of the brewing vessel by means of the attachment ring.

[0032] The integral mounting ring allows simple mounting of the wall section on the bottom section. The extraction vessel can be manufactured correspondingly simply and inexpensively.

[0033] It may be provided that the cover portion is formed as an integral component of the wall portion.

[0034] The cover portion being formed as an integral component of the wall portion makes it possible to eliminate a separate step in the manufacturing process: a separate step for bonding the cover portion to the wall portion may not be necessary, which increases process safety and simplifies quality control.

[0035] The mounting ring and the cover portion may be coupled to one another via a helical structure.

[0036] This ensures that the cover portion is securely held by the mounting ring.

[0037] A tube film may extend between the mounting ring and the cover portion.

[0038] The tube film can provide a space or volume between the cover part and the mounting ring, into which, for example, an extract dry substance can be introduced. The tube film allows for an airtight formation of the wall part, so that there is no risk of the aroma of the extract dry substance evaporating.

[0039] The tube film and the attachment ring and / or the cover portion and / or the helical structure may have an integral joint.

[0040] The integral bond is reliable and secure and meets high quality standards, which can be achieved by simple means. The formation of the integral bond further makes it possible to eliminate the need for laborious testing for quality control, as well as to eliminate the need for additional bonding steps.

[0041] The joint between the tube film and the cover part and / or the mounting ring and / or the helical structure may be formed as an injection molded joint.

[0042] The formation as an injection-molded joint allows for a relatively simple integral connection between the two elements, which can be injection-molded around the tube film, thus sealing it from two sides, and also allows for a partial fusion or welding connection by injection-molding the elements around or attached to the tube film, so that the surfaces are at least partially interlocked with one another.

[0043] This also makes it possible to manufacture the cover part together with the mounting ring and the helical structure as one integral part, the advantages of which have already been explained with respect to the wall part and which also apply in this case.

[0044] An inlet valve may be arranged in the cover part, by providing the inlet valve it may be ensured that the cover part can be closed reliably and tightly.

[0045] An outlet valve may be arranged in the bottom part, by providing the outlet valve it may be ensured that the bottom part can be closed reliably and tightly.

[0046] The extraction vessel can thus be closed air-tight in the contracted form.

[0047] The valve also allows for the inherent opening and closing of the extraction vessel.

[0048] Additionally, it may be provided that a filter sieve is arranged in the bottom part, which is arranged in such a way that the fluid flow is filtered, in particular in the direction from the interior of the extraction vessel towards the outlet valve.

[0049] Yet another aspect relates to a method for manufacturing a wall section for an expandable brewing vessel for containing brewed dry substances for the preparation of an brewed beverage, in particular a wall section as described above. The wall section is provided in particular for an expandable brewing vessel as described above. The method comprises the following steps: - preparing a tube film; - positioning a tube film over a tool core; - placing the tool core in an injection mould; - injection molding the mounting ring directly onto the tube film to bond the mounting ring and the tube film together; - die cutting a tube film with a mounting ring injection molded to adhere to the tube film; Includes.

[0050] This allows for a simple and inexpensive production of the wall section with the tube film and the mounting ring as one integral component: the bond between the mounting ring and the tube film is formed directly by injection molding, and no additional step is required to join these two elements.

[0051] During injection molding of the mounting ring, the cover portion can be injection molded directly onto the tube film in the same step, so that the cover portion and the tube film are also bonded together.

[0052] This manufacturing step simplifies the manufacturing of the wall portion and makes it possible to eliminate a separate step for bonding the tube film to the cover portion, which no longer needs to be manufactured separately and which eliminates the need for a subsequent interface between the cover portion and the tube film, just as it eliminates the interface between the tube film and the mounting ring.

[0053] During injection molding of the mounting ring, in the same step, the helical structure can be injection molded directly onto the tube film so that the helical structure and the tube film are bonded together.

[0054] This step also facilitates fabrication and makes it possible to eliminate the need for a corresponding additional step to attach the tube film to the helical structure.

[0055] Injection molding onto or around a film also allows for partial fusion or welding bonding, so that the surfaces of the film and the surfaces of the element that is injection molded onto or around the film are at least partially interlocked.

[0056] The tube film is a deformable tube film.

[0057] The use of a deformable tube film ensures that the wall portions can be shrunk subsequent to manufacture.

[0058] In this case, it may be provided that the cover part is moved towards the attachment ring, which causes the diameter of the helical structure to increase slightly, or alternatively, it may be provided that while the cover part is moved towards the attachment ring, the wall part is twisted slightly, so that the outside diameter of the helical structure does not change.

[0059] In the following, different aspects of the invention are explained with the aid of schematic drawings. [Brief description of the drawings]

[0060] [Figure 1] FIG. 2 is a perspective cross-sectional view of an extraction vessel. [Figure 2A] FIG. 2 is a perspective view of the extraction vessel shown in FIG. 1 in a contracted form. [Figure 2B] FIG. 2B is a perspective view of the extraction vessel shown in FIG. 2A in an expanded form. [Diagram 3] FIG. 2 is an exploded view of the extraction vessel shown in FIG. [Figure 4] FIG. [Diagram 5] FIG. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. 2 is a detailed view of a portion of FIG. [Figure 9] FIG. [Figure 10] FIG. 10 is a perspective view of the tool core shown in FIG. 9 and a tube film arranged to cover the tool core. [Figure 11] FIG. 2 is a perspective view of the tool core and tool halves.

[0061] For the sake of clarity, the extraction dry matter possibly present in the extraction vessel 20 has been omitted in all figures.

[0062] In FIG. 1, a perspective cross-sectional view of the brewing vessel 20 is shown. The brewing vessel 20 has an inlet valve 10 and an outlet valve 30 with a delivery opening. The brewing vessel itself comprises a bottom part 21, a cover part 22 and a wall part 23. The wall part 23 is expandable and in this case comprises a tube film 233. The wall part 23 is connected liquid-tight to the bottom part 21 on the one hand and to the cover part 22 on the other hand. A helical structure 234 is formed around the periphery of the tube film 233. This wall part 23 is surrounded by the bottom part 21 and the cover part 22. For this purpose, the bottom part 21 is provided on the periphery with a hollow cylindrical wall 211 extending in the direction of the cover part 22.

[0063] It can also be seen that the outlet valve 30 is at least partially formed as an integral component of the bottom part 21. A closure 31 is provided to complete the outlet valve 30. A filter sieve 40 is also shown, which is arranged upstream of the delivery opening and thus upstream of the outlet valve 30.

[0064] 1, the inlet valve 10 is at least partially formed as a component of the cover part 22 and cooperates with a corresponding counter-element on the bottom part 21, which is a projection on the filter sieve 40. A sealing film 221 is arranged on the cover part 22, which closes the inlet valve 10.

[0065] The extraction vessel 20 shown in FIG. 1 is substantially rotationally symmetric and has a central axis L, which also defines an axial direction. If the extraction vessel 20 is not rotationally symmetric, there is still a central axis. This central axis is substantially defined by a line connecting the inlet valve 10 and the outlet valve 30. The inlet valve 10 and the outlet valve 30 also define the flow direction from the inlet valve 10 to the outlet valve 30.

[0066] In Fig. 2A, a perspective view of the extraction vessel shown in Fig. 1 is shown, in the contracted form of said extraction vessel. As can be seen from the drawing, in this form the extraction vessel 20 essentially consists of a bottom part 21 (see Fig. 1) which is arranged inside the closure 31, a hollow cylindrical wall part 211 and a cover part 22 closed by a sealing film 221, by which the expandable wall part located inside the extraction vessel 20 is arranged in a protected manner.

[0067] As can be seen from FIG. 2A and FIG. 1, in the contracted form, the bottom part 21 is connected to the cover part 22 via a wall 211 arranged on its periphery.

[0068] 2B shows a perspective view of the brewing vessel 20 shown in FIG. 2A in its expanded form. By introducing overpressure via the inlet valve 10 (see FIG. 1), the cover part 22 is pushed out of the corresponding seat 215 (see FIG. 5) on the wall 211 and the wall part 23 is expanded by introducing the extract into the brewing vessel 20. This expansion is assisted by the helical structure 234. Of course, the inlet valve 10 is opened before the introduction of overpressure. The brewing vessel 20 then remains in this expanded form for a predefined time and is subsequently compressed for the discharge of the extracted beverage. Of course, the outlet valve 30 (see FIG. 1) is opened in particular before the compression and the extracted beverage is delivered through this outlet valve 30.

[0069] 3 shows an exploded view of the extraction vessel 20 shown in FIG. 1. The extraction vessel 20 has a cover part 22 with a sealing film 221 attached to it. The sealing film 221 is attached to the cover part 22 by means of an adhesive in this case. However, it is also conceivable that the sealing film 221 is arranged on the cover part 22 by ultrasonic welding or conventional fusion / fusion. In this case, it can be seen that the cover part 22 has an opening 222, which is also closed by the sealing film 221.

[0070] Also shown is wall portion 23, which has a first end 231 and a second end 232. First end 231 and second end 232 are joined to one another by tube film 233. In other words, tube film 233 has first end 231 and second end 232. First end 231 is integrally joined to mounting ring 50. Second end 232 is integrally joined to cover portion 22.

[0071] A helical structure 234 is formed around the periphery of the tube film 233 and is also integrally connected to the tube film 233. The cover part 22, the helical structure 234 and the mounting ring 50 are manufactured as one piece by injection molding and are therefore formed as a one-piece injection molded part. By means of the injection molding process, these elements can be injection molded so as to be applied or attached directly to the tube film 233.

[0072] 3 also shows the bottom part 21 with a wall 211 extending in the direction of the cover part 22. A closure 31 of the outlet valve 30 is arranged in the bottom part 21. The closure 31 is arranged in the bottom part 21 so as to be axially movable.

[0073] The closure 31 fits completely over the bottom part 21. A closing body 312 is formed in the center as an integral part of the closure 31 (see FIG. 6), which closes an opening in the bottom part 21. A filter sieve 40 is also shown, which is arranged upstream of the delivery opening. By moving the closure 31 axially, it is possible to open the opening in the bottom part 21 and thus the outflow valve 30.

[0074] In the following figures, the individual components of the extraction vessel 20 shown in FIG. 3 will be described in detail.

[0075] 4 shows a perspective view of the sealing film 221. In this case, the sealing film is made of polypropylene and has a thickness of 0.05 mm to 0.1 mm, and here has a thickness of 0.8 mm.

[0076] FIG. 5 shows a perspective view of the bottom part 21. A hollow cylindrical wall 211 is arranged in the bottom part 21. The upper end of this hollow cylindrical wall 211 has a seat 215 for engaging the cover part 22 (see FIG. 1). For this purpose, a protruding element is formed in the cover part 22. At the transition between the hollow cylindrical wall 211 and the substantially planar base element of the bottom part 21, a clamping element 212 is provided. The clamping element 212 is formed by a substantially axially extending projection 214 and by a part of the hollow cylindrical wall 211. A corresponding counter-part, in this case a mounting ring 50 (see FIG. 1), can be fitted between these two elements. A substantially axially extending sealing lip 213 is arranged inside the clamping element 212. Both the sealing lip 213 and the projection 214 are formed annularly around the center of the bottom part 21.

[0077] A filter sieve 40 is arranged in the center of the bottom portion 21 .

[0078] 6 shows a perspective view of the closure 31. The closure 31 has a peripheral edge 311 and a centrally located closing body 312. The peripheral edge 311 is formed with radially inwardly directed projections for engaging corresponding counterparts on the bottom portion 21.

[0079] In FIG. 7, a perspective view of the wall part 23 is shown. The wall part 23 has a first end 231 and a second end 232. The wall part 23 in this case comprises a cover part 22, which is arranged at the second end, and a mounting ring 50, which is arranged at the first end 231. The wall part 23 further comprises a helical structure 234. The cover part 22, the helical structure 234 and the mounting ring 50 are produced together as one integral piece in an injection molding process. The wall part 23 further comprises a tube film 233. The cover part 22, the helical structure 234 and the mounting ring 50 are injection molded to be applied or attached to this tube film 233. The tube film 233 accordingly has an integral attachment to the cover part 22, the helical structure 234 and the mounting ring 50. These elements are therefore connected to one another in a liquid-tight and air-tight manner. It can be seen that the cover portion 22 is provided with an opening 222 and a portion of the inlet valve 10 (see FIG. 1).

[0080] The tube film is made of PET and has a thickness of 0.1 mm. The tube film is free of plasticizers and has a heat resistance up to 200°C.

[0081] 8, a detailed view of a portion of FIG. 1 is shown. Tube film 233 is shown with an integrally disposed mounting ring 50 having a first leg 51 and a second leg 52. First leg 51 is spaced from second leg 52 by an annular extending groove.

[0082] The mounting ring 50 is held in a clamping element 212 provided on the bottom part 21. The mounting ring 50 is clamped between a hollow cylindrical wall 211 and an annular extending projection 214. To prevent axial movement, the wall 211 is provided with a projection 216 which prevents axial movement of the mounting ring 50. A sealing lip 213 is in contact with the first leg 51 of the mounting ring 50.

[0083] This ensures that the mounting ring 50, and in turn the tube film 233 attached integrally to the mounting ring 50, is held securely and liquid-tightly on the bottom portion 21.

[0084] In the following figures, the individual steps of the manufacturing method for a wall section 23 as shown in FIG. 7 are shown.

[0085] FIG. 9 shows a perspective view of the tool core 60 and the tube film 233. The tube film 233 is produced by rolling and welding the film one by one. The individual films are produced in this case from PET and have a thickness of 0.1 mm. The tube film 233 has a first end 231 and a second end 232. The first end 231 has a slightly larger diameter than the second end 232. That is to say, the tube film 233 is formed so that it tapers in an overall conical manner. The tool core 60 is correspondingly formed in a conical manner. In a first step, the tube film 233 is placed in front of the tool core 60.

[0086] Figure 10 shows a perspective view of the tool core 60 shown in Figure 9 with a tube film 233 positioned over the tool core 60. The tube film 233 is positioned over the tool 60. The tool 60 together with the tube film 233 is then inserted into an injection mold 61 (see Figure 11) or the injection mold 61 is closed around the tool core 60.

[0087] Subsequently, a correspondingly liquefied plastic, in this case polypropylene, i.e. PP, is injected into the injection mold 61 and the mounting ring 50, the spiral structure 234 and the cover part 22 are injection molded so that they adhere to the tube film 233.

[0088] 11 shows a perspective view of the tool core 60 and the tool halves 62, 63 of the injection mold 61. In FIG. 11, the tool halves 62, 63 are shown after opening after injection molding. As can be seen, the helical structure 234, the cover part 22 and the mounting ring 50 are formed as one integral injection molded part and are integrally connected to the tube film 233 in the injection molding process.

[0089] Thus, following opening of the injection mould 61, the completed wall section can be demolded from the tool 60.

Claims

1. A wall portion (23) for an expandable brewing vessel (20) for containing brewed dry matter for the preparation of an brewed beverage, the wall portion (23) having a first end (231) and a second end (232), and further having a deformable tube film (233) joining the first end (231) and the second end (232), A wall portion (23) for an expandable extraction vessel (20), characterized in that the first end (231) has a mounting ring (50) that is integrally joined to the tube film (233).

2. The wall portion (23) according to claim 1, characterized in that the second end (232) is formed as a cover portion (22) of the extraction vessel (20), and the cover portion (22) is integrally connected to the tube film (233).

3. 2. The wall portion (23) according to claim 1, characterized in that the first end (231) and the second end (232) are connected to each other via a helical structure (234).

4. 4. The wall portion (23) according to claim 3, characterized in that said helical structure (234) is integrally connected to said tube film (233).

5. 2. The wall part (23) according to claim 1, characterized in that the joint between the tube film (233) and the cover part (22) and / or the mounting ring (50) and / or the spiral structure (234) is formed as an injection-molded joint.

6. 6. The wall portion (23) of claim 5, wherein said cover portion (22), said mounting ring (50) and said helical structure (234) are formed as one integral piece.

7. 3. The wall portion (23) according to claim 2, characterized in that the cover portion (22) has one or more openings (222), and a sealing film (221) is arranged on the cover portion (22) to close the openings (222).

8. An expandable brewing vessel (20) for containing brewed dry substances for the preparation of an brewed beverage, comprising a bottom part (21), a cover part (22) and a wall part (23) connecting said bottom part (21) and said cover part (22), in particular the wall part (23) according to claim 1, wherein said wall part (23) has a variable length, The expandable extraction vessel (20) is characterized in that the first end (231) of the wall portion (23) has an integral mounting ring (50) by means of which the wall portion (23) is attached to the bottom portion (21).

9. 9. The expandable extraction vessel (20) according to claim 8, characterized in that the cover portion (22) is formed as an integral component of the wall portion (23).

10. 10. The expandable extraction vessel (20) according to claim 9, characterized in that the attachment ring (50) and the cover part (22) are connected to each other via a helical structure (234).

11. 10. The expandable extraction vessel (20) according to claim 9, characterized in that a tube film (233) extends between the mounting ring (50) and the cover part (22).

12. 12. The expandable extraction vessel (20) according to claim 11, characterized in that the tube film (233) and the mounting ring (50) and / or the cover part (22) and / or the spiral structure (234) have an integral joint.

13. 13. The expandable extraction vessel (20) according to claim 12, characterized in that the joint between the tube film (233) and the cover part (22) and / or the mounting ring (50) and / or the spiral structure (234) is formed as an injection-molded joint.

14. 10. The expandable extraction vessel (20) according to claim 9, characterized in that an inlet valve (10) is arranged in the cover part (22).

15. 9. The expandable extraction vessel (20) according to claim 8, characterized in that an outlet valve (30) is arranged in the bottom part (21).

16. 9. The expandable extraction vessel (20) according to claim 8, characterized in that a filter sieve (40) is arranged in the bottom part (21).

17. A method for producing a wall section (23) for an expandable brewing vessel (20) for containing brewed dry substances for the preparation of an brewed beverage, in particular an brewing vessel (20) according to any one of claims 8 to 16, in particular a wall section (23) according to any one of claims 1 to 7, comprising: - providing a tube film (233); - positioning said tube film over the tool core (60); - placing said tool core (60) in an injection mould (61); - injection molding a mounting ring (50) directly onto the tube film (233) to bond the mounting ring (50) and the tube film (233) together; - die-cutting the tube film (233) with the mounting ring (50) injection-molded to adhere to the tube film (233); 1. A method for manufacturing a wall portion (23), comprising:

18. 18. The method of claim 17, further comprising injection molding a cover portion (22) directly onto the tube film (233) during injection molding of the mounting ring (50), thereby bonding the cover portion (22) and the tube film (233) together.

19. 18. The method of claim 17, further comprising injection molding a helical structure (234) directly onto the tube film (233) during injection molding of the mounting ring (50), thereby bonding the helical structure (234) and the tube film (233) together.

20. 18. The method of claim 17, wherein the tube film (233) is a deformable tube film (233).

Images