Cartridge and method for manufacturing a cartridge

Abstract

The present invention relates to a cartridge (10) for a dispensing device, the cartridge (10) being essentially non-rigid and comprising at least one elongated film pouch (18) having a chamber (20) for receiving a composition (102), and a head portion (12) for interacting with the film pouch (18), the film pouch (18) having an opening on the side facing the head portion (12) closed by a cover (14). The insert (16) is conical on the side facing the head portion (12). A method for manufacturing such a cartridge (10) is also described.

Description

Technical Field

[0001] The present invention relates to a cartridge for a dispensing device and a method for manufacturing the cartridge.

Background Art

[0002] Cartridges are mainly used for storing materials such as adhesives, sealing compounds, mortars, paints, or lubricants. Additionally, if the cartridge is inserted into the corresponding dispensing device, the material can be easily applied to an object through the cartridge. The material can be applied accurately using the dispensing device. For example, the rod of the dispensing device presses the base of the cartridge, as a result, the volume of the cartridge is compressed, and thereby the material located within the cartridge is extruded from the opening. Accessories can be attached to the cartridge so that the material can be applied to the object in a controlled and accurate manner.

[0003] Cartridges designed to have an essentially non-rigid film pouch and an essentially rigid insert are well known from practice. The film pouch has a cylindrical wall and a base portion, and the insert is connected to an end remote from the base portion of the film pouch. The insert is annular and has a circular opening closed by a cover, and through the opening, the chamber can be filled with material.

Summary of the Invention

Problems to be Solved by the Invention

[0004] In this type of cartridge, the cover may come off the insert in an undesirable manner.

[0005] An object of the invention is to provide a cartridge in which the cover is firmly attached to the insert in a simple manner. A further object of the invention is to provide a method for manufacturing such a cartridge.

[0006] The objective is achieved by the subject matter of the independent claim. Advantageous embodiments relating to the subject matter of the independent claim can be found in the dependent claims. [Means for solving the problem]

[0007] A cartridge for a dispensing device is provided, comprising at least one essentially non-rigid elongated film pouch having a chamber for receiving a composition, and having an essentially rigid insert having a head portion for interacting with the film pouch, wherein the insert is connected to the side of the film pouch facing the head portion and has a passage closed with a cover. According to the invention, it is proposed that the side of the insert facing the head portion is conical.

[0008] The conical design of the insert allows the cover connected to the insert to be easily and securely attached to the insert under all conditions, providing a structurally simple cartridge that securely holds the insert. Furthermore, undesirable peeling or slipping and / or damage to the cover, for example, if designed as a film, is reliably prevented due to the introduction of favorable forces. The conical design of the insert also ensures that the cover can reliably withstand the high pressure in the chamber, as the notch effect in the connection area of ​​the cover to the insert is low, even if the pressure in the chamber rises before opening.

[0009] It has been found to be particularly advantageous when the surface of the insert facing the head portion encloses an angle of 10° to 50° with respect to the horizontal, which is perpendicular to the central axis of the film pouch, and the area of ​​the surface facing the central axis is at a greater distance from the base portion of the film pouch than the area of ​​the surface facing the opposite side of the central axis. The angle is particularly preferably 15° to 35°, and especially about 25°.

[0010] In an advantageous embodiment of the invention, the cover has a predetermined break region. This provides an easy-to-use cover. On the one hand, the cover securely closes the film pouch and prevents material in the chamber from unintentionally leaking out. On the other hand, the cover allows for a simple and safe, in particular, predetermined opening, to deliver the composition located in the chamber. The characteristics of the opening are improved by the predetermined break region, especially when the cartridge is used in a dispensing device.

[0011] A predetermined break zone within the cover allows the cartridge to be opened within the dispensing device using a specified method, particularly with relatively weak force. At the same time, the cover can be designed in a simple manner to ensure stability, for example, in the event of accidental dropping, to prevent the cartridge from opening automatically. The cover can also prevent leakage of the composition located within the cartridge in a simple manner, to a very small or even complete degree, and can be significantly reduced, especially compared to well-known cartridges.

[0012] The cover may be designed specifically as a film, or it may be designed in the form of a plate, for example, a plastic plate.

[0013] The predetermined fracture region can easily have any shape, and depending on the application, it can be, for example, circular, elliptical, square, rectangular, angular, or linear, or a combination of these shapes.

[0014] In an advantageous embodiment of the cartridge according to the invention, the cover has a specified material discontinuity in a predetermined fracture region compared to further areas of the cover, at least within the regions, particularly throughout the entire planar region. The cover has a simple design and can be manufactured cost-effectively, thus enabling the cover to be reliably and in a specified manner within the predetermined fracture region. The specified material discontinuity can be formed, for example, by the cover having an increased or decreased material thickness in a predetermined fracture region compared to further areas of the cover, at least within the regions. This enables the cover to be reliably and in a specified manner within the predetermined fracture region. Such a cover can also be manufactured easily and cost-effectively.

[0015] A predetermined fracture region of the cover may also have a different material strength than other areas of the cover. This ensures that the cover can be opened reliably and in a specified manner at the predetermined fracture region.

[0016] Further regions of the cover are understood herein to be regions of the cover that are not associated with a given fracture region and extend outside the given fracture region. In these further regions of the cover, substantially constant material properties are preferably present.

[0017] In an advantageous embodiment of a cartridge invention that is particularly cost-effective to manufacture, a predetermined fracture region of the cover is demarcated by a linear material weakening section. The linear material weakening section completely surrounds the predetermined fracture region and thus separates the predetermined fracture region from further areas of the cover. The linear material weakening section can be both a continuous, particularly uniform, material weakening section and a perforated section, and the material thickness or material strength of the linear material weakening section can be less than or greater than the material thickness of further areas of the cover.

[0018] In order to achieve a specified opening in the cover under use, in an advantageous embodiment of the invention, a specified fracture region of the cover may have a specified material strength different from that of further regions of the cover. In this case, the different strength or material structure of the cover may be provided entirely in the specified fracture region or within a region linearly surrounding the specified fracture region. This can be achieved, for example, by the action of temperature, particularly by laser or energy radiation.

[0019] The predetermined break region of the cover may have a notch, preferably star-shaped, cross-shaped, linear, circular, or semi-circular. The special shape of the notch allows for adjustment of the pressure required to open the cartridge. In addition, the shape and spatial arrangement of the notch may affect the characteristics of the opening.

[0020] To enable particularly rapid filling of the film pouch and to safely allow the release of air present within the film pouch, the insert may have at least one vent opening and / or at least one vent slot independent of the passage. The passage is particularly circular and, when the film pouch is being filled, preferably located near the filling tube of the filling device. Air located within the chamber of the film pouch can easily escape through the vent opening and / or vent slot. After the filling process, the vent opening and / or vent slot can be sealed and closed, in particular by a cover, thereby sealing the composition located within the chamber.

[0021] Alternatively, or in addition, the insert passage may have at least one ventilation notch in the region facing the central axis of the film pouch, thereby allowing air located within the chamber of the film pouch to escape directly along the filling tube through the ventilation notch during the filling process of the film pouch by a filling device having a filling tube having a circular cross-section.

[0022] Both the provision of ventilation openings or ventilation slots and the provision of ventilation notches prevent the generation of high pressure during the filling process, and as a result, the filling process can be carried out cost-effectively.

[0023] Preferably, a plurality of ventilation openings and / or ventilation slots are provided, which are particularly uniformly distributed around the circumference of the insert.

[0024] In one embodiment of the invention that is structurally simple to manufacture, the ventilation openings have a substantially circular cross-section. The ventilation slots are preferably arranged substantially concentrically with respect to the central axis of the insert.

[0025] The ventilation notch can have a substantially rectangular, L-shaped, curved, or equivalent shape.

[0026] In an advantageous embodiment of the cartridge according to the invention, the insert and the head part each have, in the regions facing each other, interacting contours that have substantially diametrically opposite contours, and the cover arranged in the region of the contours is weldable. In this way, the cover can preferably not only be connected to the insert by a welding process, but the insert can also be connected to the head part by the cover by an alternative or additional welding process. The welding tool prepared for this purpose preferably has a cylindrical indentation that substantially corresponds to the film pouch and can be guided around the film pouch in the direction of the insert from the side facing away from the head part, and the welding tool is designed to heat the cover at least within the region of the contours of the insert and the head part, thereby enabling the cover to weld the insert to the head part. The welding tool engages preferably outside around a specific film pouch.

[0027] The film pouch can preferably be formed by a cylindrical film tube whose bottom is closed by a base part, and the base part is adhesively bonded and / or welded to the film tube in particular. The film tube, also called a tubular film or an inflation film, can be made of a thermoplastic material, and the film tube can be extruded or welded or adhesively bonded at its longitudinal seam. Since the base part is adhesively bonded and / or welded in particular, an integral connection is thereby produced, improving the storage properties of the cartridge, and thereby reducing the leakage rate of the cartridge compared to a cartridge in which the film pouch is closed by a clip closure.

[0028] The cartridge has, for example, a head part with at least one receiving part for at least one insert. The head part represents a kind of adapter since it enables commercially available accessories or standard dispensing devices to be used to apply the composition located in the cartridge. Thus, the insert that protrudes partially beyond the film pouch represents an interface to the head part.

[0029] The insert has a stepped raised portion on the side protruding from the film pouch, and through the raised portion, the insert can be received in the receiving part of the head part. The raised portion enables the insert to be stably received in the receiving part of the head part. Thereby, the airtightness during operation is also improved.

[0030] Similarly, the cover can rest on at least two surfaces of the stepped raised portion that are substantially perpendicular to each other, for example. In this way, the cover can also be fixed in a stable manner to the insert on the lower surface and into the receiving part of the head part on the upper surface. Furthermore, this also reduces leakage.

[0031] In one embodiment, the head part has an outlet nozzle that is in fluid connection with the receiving part. The outlet nozzle can define the flow rate, particularly via its diameter.

[0032] The outlet nozzle may have threads. A commercially available accessory or dispensing device for applying the composition located in the cartridge can be precisely attached to the outlet opening of the head's outlet nozzle by the threads, thus enabling precise placement and dispensing of the composition during application.

[0033] The outlet nozzle may also have a partition that divides the volume into two or more outlet channels. The relative positions of the partitions within the outlet nozzle define the cross-section of the outlet channels and, therefore, determine the flow rate through these outlet channels.

[0034] The outlet channels can have different diameters. The outlet channels can be oriented coaxially with respect to each other.

[0035] Therefore, the head portion can be suitable for receiving several film pouches that may have different compositions. The head portion separates the different compositions up to the exit opening, so that the different compositions can only come into contact after the exit opening. This is important, for example, in the case of two-component adhesives.

[0036] Therefore, the cartridge can accept different compositions and function as a multi-component package. The different diameters of the outlet openings allow for the setting of specific mixing ratios for different compositions.

[0037] The composition located inside the cartridge can be a chemical composition or a liquid, such as a component of a two-component mixture.

[0038] Sealing compounds, multi-component mortars, multi-component coating compounds, multi-component paints, multi-component foam precursors, multi-component adhesives, multi-component sealing compounds, and multi-component lubricants can be stored in the corresponding cartridges.

[0039] An expansion space can be allocated in the head section's receiving area, allowing the cover to be extended. This expansion space enables the cover to open in a controlled manner, without obstructing the flow of the outflowing composition. On the one hand, this results in laminar flow, as there are no obstacles in the flow path that could cause turbulence. On the other hand, this ensures that the flow rate is precisely maintained, which is important for the mixing ratio of two or more components.

[0040] In one embodiment, the passage is tapered. As a result, the passage acts like a diffuser or nozzle when the composition flows out. The tapered passage can also act as a diffuser when the film pouch is filled.

[0041] The passage can be adapted, in particular, to the composition-filled cone located within the chamber. This allows for optimal filling of the chamber with the composition, with little to no air remaining inside.

[0042] In one embodiment, the cartridge is essentially non-rigid and has at least one second elongated film pouch having a chamber for receiving the composition. Thus, the cartridge can be used as a multi-component package. Therefore, a resin for a two-component adhesive, such as an epoxy resin, and a curing agent can be stored in the same package.

[0043] The second film pouch may have the same length as the first film pouch, in which case the ratio of the base of the film pouch determines the mixing ratio to be achieved. Alternatively, two film pouches of different lengths may be used.

[0044] The base can be made from plastic materials such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and / or acrylonitrile-butadiene-styrene copolymer (ABS). The base can be manufactured by injection molding, 3D printing, or machining. It can also consist of pre-formed single-layer or multi-layer films. The base can be formed from the same material as the cover or an equivalent material. This allows for cost-effective manufacturing of the base.

[0045] Film pouches can include single-layer or multi-layer films. The total thickness is 50–350 μm, particularly 80–150 μm. The materials used can be PE, PP, PET, aluminum, ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA), and / or polylactide (PLA). Each layer may also be coated with silicon dioxide or aluminum oxide. Multi-layer films can be manufactured by adhesive or extrusion lamination.

[0046] The film pouch can preferably be uniformly crushed during the dispensing process, similar to an accordion, so that the entire composition in the chamber can be used as much as possible. During use, the film pouch is sometimes exposed to chemical compositions or liquids that may act on the film pouch. Therefore, the precise structure of the film pouch may need to be adapted to the composition or liquid in the chamber, particularly to the corresponding material properties.

[0047] The cover can preferably be designed as a multilayer film.

[0048] For example, the cover has layers of PE and / or PP on the top and bottom so that it can be welded, for example, heat-welded, to other plastic parts of the cartridge. In particular, if other plastic parts of the cartridge are made of PVC, the film may also have a layer made of PVC.

[0049] For example, a barrier layer can be provided between the top and bottom surfaces of the cover to prevent oxygen or water vapor from entering the chamber after it has been closed. This ensures that gaseous release of the composition located inside the chamber is prevented.

[0050] The total thickness of the cover can be between 50 μm and 350 μm. In particular, the total thickness is between 130 μm and 250 μm.

[0051] The barrier layer may include, for example, a coating of aluminum, or silicon dioxide and / or aluminum oxide, on PET, biaxial array PP (BOPP), PA, PLA, or ethylene-vinyl alcohol copolymer (EVOH).

[0052] For chemically active compositions, i.e., demanding fillers, multilayer films are preferred.

[0053] In a further embodiment, the invention is a method for manufacturing such a cartridge for a dispensing device, - A step of preparing a film pouch having a chamber, wherein the film pouch is connected to a dimensionally stable insert and a base, and the insert has an opening, - The step of filling the chamber with the composition through the opening, - The method involves the step of closing the opening with a cover.

[0054] The technical advantages described for the cartridge also apply to the proposed method for manufacturing the cartridge, such that the cover can be attached to the insert in a simple manner and the chamber closes securely. Even under high pressure within the chamber, the cover remains firmly in place on the insert, and damage to the cover is reliably prevented.

[0055] The manufacturing of the filled cartridges can also be divided into various manufacturing steps. In particular, the manufacturing of the film pouch is separated into the filling of the film pouch and the attachments of the film pouch within the head unit.

[0056] The modular structure of the cartridge allows individual elements to be adapted to the various requirements of the cartridge imposed by the composition within the chamber. Separating the manufacturing of the film pouch from the filling process reduces the complexity of cartridge manufacturing. This means that a wider range of machinery and materials can be used for manufacturing and filling, thus ensuring better quality.

[0057] In an advantageous embodiment of the method according to the invention, a predetermined break region is generated within the area of ​​the cover. The predetermined break region of the cover can be generated, for example, before, after, or during the manufacture of the film pouch. Preferably, the predetermined break region is introduced into the cover only after the composition has been filled into the chamber and the chamber has been closed with the cover. In this regard, to form the predetermined break region, for example, the material of the cover is removed from the outer surface facing away from the chamber. However, the predetermined break region can also be generated before the cover is attached to the chamber. This also brings about the possibility of forming a predetermined break region on the lower surface of the cover facing the chamber, or forming two opposing predetermined break regions on the lower and upper surfaces.

[0058] In an advantageous embodiment of the method according to the invention, the film pouch has a film tube and a base portion, the film tube is preferably formed by welding or bonding.

[0059] In an advantageous embodiment of the method according to the invention, a predetermined fracture region of the cover is generated by laser, material weakening by hot stamping or heat stamping using a heated stamp, by scoring with a suitable cutting tool or knife, or during the process of welding the cover to an insert. In this way, it can be easily achieved that the predetermined fracture region has a different material thickness and / or material strength, in particular, from further areas of the cover, thereby forming a specified predetermined fracture region.

[0060] When generating a predetermined fracture region during the welding process of a cover to an insert, to achieve the predetermined fracture region, preferably, at least one welding parameter is varied with respect to connecting the cover to the insert within a further area, for example, higher pressure, increased temperature, extended welding time, or a combination of these parameters is used. Thus, the predetermined fracture region is generated very close to the weld seam or at the weld seam itself.

[0061] In an advantageous embodiment of the method according to the invention, the insert has at least one material extension, in particular a material extension surrounding the passage that melts during the closure of the passage. As a result, airtightness is improved because the melting can ensure an integral bond between the insert and the cover. The material extension can surround the passage of the insert. It acts as the intended melting point of the insert, thereby providing a high-quality cover in which the composition cannot escape from the chamber through the opening.

[0062] In an advantageous embodiment of the method according to the invention, a head portion having at least one receiving portion is provided, and an insert is inserted into the receiving portion.

[0063] The head unit allows the cartridge to be inserted into a commercially available dispensing device, thereby enabling controlled dispensing of the cartridge when the composition in the chamber is applied to the appropriate object.

[0064] In addition, in an advantageous embodiment of the method according to the invention, a second film pouch having a chamber may be provided. The second film pouch may be designed similarly to the first film pouch and connected to the head portion. The connection is preferably made by bonding or welding. Thus, multi-component packaging or cartridges can be manufactured in a simple manner.

[0065] It is possible to provide different covers for various chambers.

[0066] To ensure that the chambers open as synchronously as possible during the cartridge dispensing process, the covers of various chambers may have differently designed predetermined break areas, such as different notches.

[0067] Further advantages may be found in the following drawings. Various embodiments of the present invention are shown in the drawings. The drawings, description and claims include a number of features in combination. Those skilled in the art will consider the features individually as appropriate and combine them to form further meaningful combinations. [Brief explanation of the drawing]

[0068] [Figure 1] This is an exploded view of the longitudinal cross-section of the cartridge according to the invention in the first embodiment. [Figure 2a] This is a detailed view of the longitudinal section of the insert in Figure 1, which has a cover designed as a film. [Figure 2b] Figure 2a is a detailed longitudinal section of a further embodiment of an insert for connecting a cover designed as a film, as shown in Figure 2a. [Figure 2c] Figure 2b shows a detailed view of an insert with a cover designed as a plastic plate. [Figure 3a] This is a plan view of the cartridge shown in Figure 1, which has a predetermined fracture region. [Figure 3b]This is a plan view of the cartridge of Figure 1 having a further embodiment of the predetermined fracture region. [Figure 4] Figure 1 shows a schematic comparison of the chamber with conventional chambers and their dispensing behavior. [Figure 5] This is a schematic diagram of the method according to the invention for manufacturing a cartridge according to the invention in the second embodiment. [Figure 6] Figure 1 is a simplified diagram of a cartridge and filling device for filling a cartridge chamber with a chemical composition. [Figure 7] These are a longitudinal section view and a plan view of one embodiment of an insert. [Figure 7a] This is a schematic plan view of a further embodiment of the insert. [Figure 7b] This is a schematic plan view of a further embodiment of the insert. [Figure 7c] This is a schematic plan view of a further embodiment of the insert. [Figure 8] This is a plan view of a further embodiment of the insert. [Figure 9] Figure 8 is a detailed view of the ventilation slots of the insert. [Figure 10] This is a plan view of a further embodiment of the insert. [Figure 11] Figure 10 shows a detailed view of the ventilation notch of the insert. [Figure 12] This shows an alternative cartridge design where the film tube and base are welded together. [Figure 13a] The cover design is shown in general terms. [Figure 13b] This is a schematic design of the alternative cover. [Figure 14] This is a preliminary design for a cover with a further alternative design. [Figure 15] Details of various embodiments of the cover, which differ from each other in terms of the design of the predetermined fracture area, are shown. [Figure 16] Details of various embodiments of the cover, which differ from each other in terms of the design of the predetermined fracture area, are shown. [Figure 17]Details of various embodiments of the cover, which differ from each other in terms of the design of the predetermined fracture area, are shown. [Figure 18] Details of various embodiments of the cover, which differ from each other in terms of the design of the predetermined fracture area, are shown. [Figure 19] Details of various embodiments of the cover, which differ from each other in terms of the design of the predetermined fracture area, are shown. [Figure 20] Side and top views of a further embodiment of the cartridge having two film pouches, the film pouches being joined together in a welding process to the head portion. [Figure 21] Side and top views of a further embodiment of the cartridge having two film pouches, which are separately connected to the head portion during the welding process. [Modes for carrying out the invention]

[0069] Figure 1 is an exploded view of the longitudinal section of cartridge 10. In the drawing, identical and equivalent components are denoted by the same negative sign.

[0070] The cartridge 10 comprises a head unit 12, two covers 14, two inserts 16, and two film pouches 18.

[0071] The film pouches 18 are essentially non-rigid and each has a cylindrical, substantially elongated shape. Each film pouch 18 separates a chamber 20 and has an opening 22, the chamber 20 can be particularly sealed by the film pouch 18.

[0072] In the shown embodiment, the film pouch 18 is formed by a base portion 24 and a film tube 26. The base portion 24 has a base 28 and a collar 30 extending around the base 28. The film tube 26 is attached to the outside of the collar 30 by welding or adhesive. In principle, the film tube 26 can also be attached to the inside of the collar 30 by welding or adhesive.

[0073] The film tube 26 can be manufactured from film, for example, by bonding or welding the edge regions. It is also possible to use pre-fabricated film tubes or pre-fabricated film pouches.

[0074] The base 28 is, for example, circular, and thereby the chamber 20 is cylindrical. However, in principle, the base 28 can be of any shape, such as rectangular or polygonal.

[0075] The insert 16 is inherently rigid and is inserted inward through the opening 22 into the corresponding chamber 20 of the associated film pouch 18, at least partially.

[0076] Figures 2a, 2b, and 2c show different design variations of the insert 16 or cover 14, where the insert 16 is provided for connection to the film pouch 18.

[0077] The insert 16 shown in Figure 2a has three integral parts 32, 34, and 36 that are arranged vertically relative to each other with respect to the longitudinal direction L of the film pouch 18 or cartridge 10, i.e., each is adjacent to the other. The first part 32 is positioned on the side opposite to the head portion 12, and the third part 36 is positioned on the side facing the head portion 12. The first part 32 has a longitudinal thickness D1 of less than 4 mm, for example, the second part 34 has a longitudinal thickness D2 of less than 5 mm, and the third part 36 has a longitudinal thickness D3 of less than 5 mm.

[0078] The inner surface 38 of the first two portions 32 and 34 facing the chamber 20, and the first region of the third portion 36 extending from the transition from the second portion 34 to the third portion 36 to the bent portion 40, has an angle α with respect to the vertical V, and this angle can take values ​​from 0 to 45°. As a result, the chamber tapers toward the head portion 12.

[0079] The inner surface 38 of the third portion 36, on the side facing the head portion 12 and above the bent portion 40, has a second region having an angle β with respect to a horizontal H that is perpendicular to the longitudinal axis L. The angle β can have a value of 0° to 60°.

[0080] The third portion 36 faces away from the chamber 20 and has an outer surface 42 including two surfaces 44 and 46. Surface 46 is positioned in a longitudinal section parallel to the horizontal H and therefore parallel to the base 28, while surface 44 is positioned in a longitudinal section at an angle δ with respect to the vertical or longitudinal direction, although in an alternative embodiment it may be positioned substantially parallel to the vertical V.

[0081] Therefore, surfaces 44 and 46 can be arranged substantially perpendicular to each other in a longitudinal section.

[0082] Figure 2b shows a further embodiment of the insert 16 that is substantially different from the insert 16 in Figure 2a, in that the third portion 36 surrounds the surface 46 and has a conical region facing the head portion 12. The surface 46 facing the head portion 12 forms an angle ε of 10 to 50°, particularly preferably about 15 to 35°, with respect to the horizontal H. The surfaces 44 and 46 are not perpendicular to each other in the longitudinal section, but rather surround an obtuse angle. Furthermore, the radially outer surface 42 of the third portion 36 is substantially oriented in the longitudinal direction L.

[0083] The insert 16 shown in Figure 2c substantially corresponds to the insert 16 in Figure 2b, and the cover 14 is designed as a plastic plate in the shown embodiment.

[0084] As shown in Figures 2a and 2b, the third portion 36 of the insert 16 is recessed relative to the outer surface 42 compared to the second portion 34, and the third portion 36 has a smaller outer diameter than the second portion 34. This forms the stepped raised portion 48 of the insert 16.

[0085] The third portion 36 has a width 50 of 3 to 8 mm in the horizontal direction H and is offset inward by a radial offset 52 of 2 to 4 mm relative to the second portion 34.

[0086] A material extension 54 is provided on a surface 46 facing the head portion 12, and therefore facing upward, and substantially parallel to the horizontal H, projecting substantially perpendicularly from the surface 46 parallel to the horizontal H, i.e., in the longitudinal direction L. The material extension 54 has a predetermined height 56 ​​and a width 58 in particular less than 2 mm, as described below.

[0087] The outer surface 42 of the first portion 32 has an angle γ of 0 to 10° with respect to the vertical V, and the outer surface 42 of the third portion 36 forms an angle δ of 0 to 60° with respect to the longitudinal direction L.

[0088] The inner surfaces 38 of portions 32, 34, and 36 facing the chamber 20 surround a passage 60 that begins at the first portion 32 and tapers conically toward the third portion 36. In this respect, the passage 60 has a larger opening 61 within the region of the first portion 32 compared to the opening 63 within the region of the third section 36.

[0089] In addition, the insert 16 has a plurality of holes 62 in the third portion 36, which are positioned between the material extension 54 and the radially inward-facing tip 64 of the third portion 36, and which in this case extend substantially in the longitudinal direction L.

[0090] In principle, the insert 16 is annular in shape, thereby allowing it to be connected to the cylindrical film tube 26.

[0091] The inside of the film tube 26 is connected to the insert 16, and the film tube 26 is connected to the outer surface 42 of the first portion 32. Preferably, the film tube 26 is welded or bonded to the insert 16.

[0092] As can be seen in Figure 1, the cover 14 is provided between the head portion 12 and the insert 16. In the assembled state of the cartridge 10, the cover 14 rests substantially on two surfaces 44 and 46 within the radially outer region of the stepped raised portion 48.

[0093] The cover 14 is connected to the insert 16, for example, by welding or bonding, and closes the passage 60 and hole 62. Thus, the cover 14 closes the chamber 20, thereby completely sealing the chamber 20, preferably in the assembled state of the cover 14.

[0094] In the embodiment shown in Figure 1, the head portion 12 has two receiving portions 66 that interact with the insert 16 and cover 14 in the assembled state. As can be seen from Figure 3a, the receiving portion 66 is divided into two regions.

[0095] In the support region 68, the receiving portion 66 is fitted to the insert 16 and the stepped raised portion 48 such that the insert 16 rests together with the cover 14 against the side surface 70 of the receiving portion 66, that is, against the outer surface 42 facing radially outward, particularly the outer surface of the third portion 36, as seen in Figure 1, and rests on the support region 68 with the cover 14 between them, as seen in Figure 3a.

[0096] Furthermore, the receiving portion 66 is designed as a recess in the receiving portion 66 and includes an extended region 72, which, as shown in Figure 1, forms an extended space 74 whose function is described below.

[0097] The head portion 12 also has an outlet nozzle 76 having an outlet opening 78 and an outlet channel 80. The outlet opening 78 is fluidly connected to an expansion space 74 and a receiving portion 66 via the outlet channel 80.

[0098] The outlet nozzle 76 shown in Figure 1 has two outlet channels 80 that are fluidly connected to a specific receiving portion 66 and separated from each other by a partition 82 that extends from a connecting component 84 separating the receiving portion 66 to the outlet opening 78.

[0099] As described below, in order to set the mixing ratio of the composition, the two outlet channels 80, as shown in Figures 1 and 3a, can have different cross-sections, in particular, different diameters.

[0100] The outlet nozzle 76 also has a threaded portion 86, thereby allowing an accessory (invisible) to be attached to the outlet opening 78 of the head portion 12. This accessory can be part of a dispensing device into which the cartridge 10 can be inserted or placed.

[0101] The cover 14 has a predetermined fracture region 88 which is located within the expanded region 72 of the receiving region 66 when the cartridge 10 is connected to the head portion 12. In this example, the cover 14 has a smaller thickness or material strength in the predetermined fracture region 88 than in other areas of the cover. Due to the smaller thickness, the cover 14 is correspondingly weakened in areas within the predetermined fracture region 88.

[0102] A predetermined fracture region 88 can be created within the cover 14, for example, by laser or hot stamping. The predetermined fracture region 88 can be created, for example, after the cover 14 has been placed on the insert 16, preferably from the side facing away from the chamber 20. Alternatively, or in addition, the predetermined fracture region 88 can also be created from the side of the cover 14 facing the chamber 20. For example, opposing regions can be machined from both sides of the cover 14 so that the predetermined fracture region 88 extends to both sides of the cover 14. The predetermined fracture region 88 can also be created by deforming the material by stamping or by melting the material by stamping. It is also possible to vaporize the material within the predetermined fracture region 88, particularly on the side facing away from the chamber 20, so that the predetermined fracture region 88 represents, for example, a notch in the cover 14 that is visible from the outside. If the predetermined fracture region 88 is created by hot stamping, the predetermined fracture region 88 is also visible from the outside. The predetermined fracture region 88 can also be created by scoring. The predetermined fracture region 88 can also be generated using the method described before the cover 14 is attached to the insert 16.

[0103] Figure 3b is a diagram corresponding to Figure 3a, with only the differences being described below. A predetermined fracture region 88 is located within the region of the extended region 72 facing the other related film pouch 18. Figure 3b shows a circumferential weld seam 89 to which the cover 14 is fixed to the surface 46 of the insert 16. The weld seam 89 is demarcated in a simplified manner by two circles 91, 93, shown here by dashed lines, which extend substantially concentrically with respect to the longitudinal axis of the film pouch 18, and the weld seam 89 here represents a portion of the surface 46. In this example, the predetermined fracture region 88 represents, for example, a portion of the weld seam 89, and the predetermined fracture region 88 coincides with the weld seam 89 at least partially, and especially completely. Alternatively, the predetermined fracture region 88 may be located very close to the weld 89. The predetermined fracture region 88 is generated during the generation of the weld seam 89 by changing the welding parameters.

[0104] The predetermined fracturing region 88 is a targeted weakening area of ​​the cover 14 such that when the film pouch 18 or chamber 20 is dispensed by a dispensing device, the cover 14 within the predetermined fracturing region 88 tears or opens in a predetermined manner.

[0105] While the cartridge 10 is being dispensed, the base portion 24 of the chamber 20 is pressed toward the head portion 12, for example by a stamp on the dispensing device. This increases the pressure within the chamber 20 directed toward the cover 14, and as a result, the composition located within the chamber 20 is pressed toward the cover 14. The cover 14 then expands into the expansion region 72. A predetermined break region 88 of the cover 14 is associated with the expansion region 72, and the predetermined break region 88 breaks when a certain force or corresponding pressure is exceeded, thereby allowing the composition to flow from the chamber 20 into the outlet channel 80 through the passage 60 of the insert 16 and the ruptured predetermined break region 88. Thus, the composition flows out from the head portion 12 through the outlet opening 78 and can be applied to, for example, an object.

[0106] Because, after the chamber 20 has been completely pushed out, the composition located within the expansion space 74 and the outlet channel 80 cannot be further pushed out through the outlet opening 78, the outlet channel 80 and the expansion space 74 should be kept as small as possible.

[0107] It has been found to be advantageous when the expansion region 72 associated with the chamber 20 has an area of ​​1 to 40%, more preferably 2 to 35%, and more preferably 3 to 30%, based on the total area of ​​the associated receiving portion 66 or 68. The expansion height 90 of the expansion space 74 should be 2.0 to 15.0 mm, particularly 3.0 to 12.0 mm, and more preferably 5.0 to 10.0 mm.

[0108] The release force required to break a predetermined fracture region 88 can be adapted by changing the expansion region 72. Furthermore, the release force can also be adapted by the corresponding arrangement of the predetermined fracture region 88 on the cover 14, or by the shape and size of the predetermined fracture region 88.

[0109] For example, if a predetermined fracture region 88 is displaced from the central region at the edge region of the extended surface 72, the required release force increases.

[0110] The expansion region 72 and the predetermined rupture region 88 are selected so that when the opening force is the same, the two chambers 20 substantially rupture and open, thereby allowing the composition to flow out of the chambers 20 synchronously. Thus, a predetermined mixing ratio of the composition from the two chambers 20, which is predetermined by the area ratio of the base 28 or the division of the outlet channel 80 by the partition 82, can be implemented.

[0111] Figure 4 shows a schematic comparison in a vertical cross-section between the chamber 20 of cartridge 10, located in the upper half of Figure 4, and the chamber 92 of a conventionally known cartridge 94, located in the lower half of the Figure.

[0112] The left side of Figure 4 shows cartridges 10 and 94 in a filled state, while the right side of Figure 4 shows cartridges 10 and 94 after dispensing or in an empty state.

[0113] In the filled state, cartridges 10 and 94 of this embodiment are surrounded by rectangular parallelepipeds 96 of equal volume, indicated by dashed lines. The width B, length L, and height (not shown) of the two rectangular parallelepipeds 96 are substantially the same here.

[0114] In the conventional cartridge 94, the chamber 92 is closed on both sides by clips 98. The clips 98 result in the chamber 92 being closed spherically at each end, thereby giving the chamber 92 a smaller volume than the rectangular parallelepiped 96 of the cartridge 10 according to the invention. Therefore, more composition can be filled into the chamber 20 than in the chamber 92.

[0115] As cartridges 10 and 94, indicated by arrows, are dispensed, the longer sides of chambers 20 and 92 are compressed, forming an accordion-like arch.

[0116] The chamber 20 of the dispensing cartridge 10 is surrounded by a rectangular parallelepiped 100. The rectangular parallelepiped 100 is smaller than the rectangular parallelepiped surrounding the prior art dispensing chamber 92, and therefore the dispensing chamber 20 has a smaller volume than the prior art dispensing chamber 92. Thus, the cartridge 10 can hold more composition than the cartridge 94 known from the prior art with the same initial available volume provided by the rectangular parallelepiped 96, and less composition remains in the cartridge 10 after dispensing compared to the prior art cartridge 94.

[0117] Referring to Figures 5 and 6, a method for manufacturing the cartridge 10 is described here according to further embodiments substantially corresponding to the embodiments described in more detail above, and therefore only the differences will be described below. Identical components are given the same reference numerals, and the above descriptions are used with respect to their design and function.

[0118] In contrast to the first embodiment, the cartridge 10 in Figure 5 has only one chamber 20, and thus only one insert 16, one cover 14, one receiving portion 66, and one outlet channel 80. Therefore, there is no partition 82 that divides the outlet channel 80 into a partial channel.

[0119] In the first method step (indicated by arrows), the base portion 24 and the insert 16 are prepared. Subsequently, the film tube 26 is attached to the outside of the collar 30, either circumferentially around the base portion 24 or in the circumferential direction, for example by adhesive or welding, thereby creating a film pouch 18 having an opening 22. The film tube 26 can also be attached to the inside of the collar 30.

[0120] Next, the inside of the opening 22 is attached to the outer surface 42 of the insert 16 in the area of ​​the first portion by welding and / or adhesive.

[0121] In the next step, which can be seen in Figure 6, the composition 102 is filled into the chamber 20 by a filling device 104 having a filling head 106 and a filling tube 108. The filling head 106 and the filling tube 108 are in fluid communication with each other.

[0122] The filling head 106 is connected, for example, to a reservoir of composition 102, and the composition 102 is pumped from the reservoir into the filling head 106. The filling tube 108 protrudes into the chamber 20 through the opening 63 and passage 60 of the insert 16, thereby allowing the composition 102 to be introduced into the chamber 20 from the filling head 106 through the filling tube 108.

[0123] During the filling process, air in the chamber 20 can escape through the hole 62, thereby allowing the filling tube 108 to have the same cross-section as the opening 63 of the third portion 36 of the insert 16. Thus, the composition 102 can be introduced into the chamber 20 through the large opening, thereby requiring only slight pressure for the filling process.

[0124] The shape of the insert 16 is adapted to the filling cone 110 of the chemical composition 102. The shape is particularly adapted to the filling cone 110 of viscous chemical mortar. As a result, after the filling process, there is only a relatively small amount of air between the insert 16 and the chemical composition 102, and in particular, no air at all. This is advantageous because the presence of air can reduce the durability of the composition 102, and in the case of larger bubbles, it can have an undesirable effect on the mixing ratio achieved when using two film pouches 18.

[0125] After the filling process, the cover 14 is attached to the insert 16, as shown in Figure 5.

[0126] To ensure that the opening 63 is securely closed, a material extension 54 can be provided, which in this case extends throughout and connects to the third portion 36 of the insert 16, and can be annular. Alternatively, multiple separate material extensions 54 can be provided, each partially annular and extending only over a portion of the circumference of the insert 16. At least one material extension 54 can function as a melting point, thereby melting the material extension 54 to connect the cover 14 and the insert 16 to each other, and in particular to join them integrally.

[0127] The cover 14 is also attached to the surfaces 44 and 46 of the insert 16. For example, the molten material of the material extension 54 flows along the surfaces 44 and 46 to form a kind of adhesive layer for the cover 14.

[0128] The cover 14 can be designed as a monofilm. After the insert 16 is closed, a portion of the cover 14 is removed from the top of the cover 14, thus creating a predetermined break region 88. This is done, for example, by removing the material of the cover 14 from its outer surface when the chamber 20 is closed.

[0129] When the cover 14 is fixed to the surface 46 of the insert 16 by welding, a predetermined fracture region 88 can be formed by setting predetermined welding parameters in a predetermined area. For example, to generate a predetermined fracture region 88 during the process of welding the cover 14 to the insert 16, higher pressure, increased temperature, extended welding time, or a combination of these parameters can be applied. The predetermined fracture region 88 can be generated in a simple manner very close to or on the surface 46.

[0130] In a further step, the head portion 12 is prepared and the insert 16 is fixed together with the cover 14 within the receiving portion 66. In particular, the surface 44 of the stepped raised portion 48 is resting against the side surface 70 of the receiving portion 66. This step can be carried out, for example, by bonding or welding, or by a similar fixing method.

[0131] Figure 7 shows the longitudinal section of insert 16 in the upper region and the corresponding plan view of insert 16 in the lower region.

[0132] The plan view in Figure 7 shows that the holes 62 are arranged circumferentially around the opening 63 as ventilation openings 112, and in particular have a diameter 114 of less than 3 mm. In this embodiment, the insert 16 has eight ventilation openings 112. In principle, any number of ventilation openings 112 can be provided. The ventilation openings 112 can be designed as ventilation bores.

[0133] Further embodiments of hole 62 are shown with reference to Figures 8 to 11.

[0134] The top view of the insert 16 in Figure 8 shows that the holes 62 are designed as ventilation slots 116 that are arranged circumferentially around the opening 63, particularly at regular intervals from one another and / or coaxial with respect to the central axis of the opening 63.

[0135] Figure 9 is a detailed view of one of the ventilation slots 116 in Figure 8. The radial width 118 of the ventilation slot 116 is less than 3 mm, and the circumferential length 120 is, for example, 1 to 20 mm.

[0136] In Figure 10, it can be seen that the hole 62 may also be designed as a ventilation notch 122. In this embodiment, the ventilation notch 122 functions as an enlargement of the opening 63, whose original shape is indicated by a dashed line within the area of ​​the ventilation notch 122.

[0137] A detailed view of the ventilation notch 122 is shown in Figure 11, from which it can be seen that the circumferential width 124 of the ventilation notch 122 is less than 4 mm.

[0138] Figures 7a, 7b, and 7c show further possible embodiments of the insert 16 for venting the film pouch 18 during the filling process. In contrast to the embodiment of the insert 16 according to Figure 1, in this case the radially inner contour 123 of the insert 16 is not circular. In Figure 7a, the inner contour 123 represents a uniform polygon, here a dodecagon; in Figure 7b, a sinusoidal ring; and in Figure 7c, a gear shape. As a result, during the filling process using the cylindrical filling pipe 108, air can escape through the opening 63 without the need for holes 62 to be provided in the insert 16. These can also be provided in alternative embodiments of the insert 16.

[0139] Figure 12 shows further possibilities for manufacturing the film pouch 18. As already described, instead of fixing the outside of the collar 30 to the inside of the film tube 26, the inside of the collar 30 can also be fixed to the outside of the film tube 26.

[0140] The cover 14 can be designed as a monofilm. Referring to Figures 13a, 13b, and 14, embodiments of the cover 14 are shown in which the cover 14 is formed by several layers or by a plastic plate.

[0141] In Figure 13a, the cover 14 comprises five layers. The intermediate layer is designed as a barrier layer 126, for example, in the form of an aluminum layer. In the figure, when the layers are numbered from top to bottom, the top layer represents the first layer and the bottom layer represents the fifth layer. The second and fourth layers are designed as polyethylene layers (PE layers) 128, respectively. The top and bottom layers of the cover 14, i.e., the first and fifth layers, are designed as polypropylene layers (PP layers) 130, respectively.

[0142] The barrier layer 126 prevents water vapor and / or oxygen from entering the chamber 20. Especially in the case of chemically active compositions, water vapor and / or oxygen can cause the composition placed in the chamber 20 to react, thereby reducing its durability or altering its composition. In addition, the material in the chamber 20 is advantageously unable to release gases due to the barrier layer 126.

[0143] Figure 13b shows an alternative design for the cover 14, again having five layers. The intermediate layer is again designed as a barrier layer 126. In contrast to the embodiment in Figure 13a, the first and fifth layers 130 are also made of polyethylene, in addition to the second and fourth layers 128.

[0144] The embodiment of cover 14 in Figure 14 also has five layers, with a barrier layer 126 forming the fourth layer. In this embodiment, the first, third, and fifth layers are each designed as PE layers 130. The second layer 132 is a layer 132 made of biaxially constructed polypropylene.

[0145] Alternatively, the cover 14 may be designed to have a particularly rigid plastic plate, preferably containing PE, PP, PET, PVC, ABS, PA, PLA, or a comparable material. The cover 14 is then connected to the insert 16 by bonding or welding to the insert 16 in the embodiment of Figure 2 or Figure 2b.

[0146] The embodiments of cover 14 shown in Figures 13a, 13b, and 14 should be understood as embodiments only. In principle, any of the materials initially mentioned are possible for the layers of cover 14, and any number of layers is also conceivable.

[0147] Referring to Figures 15 to 19, various embodiments of the predetermined fracture region 88, which differ from one another in their shape, are shown below. In all of these figures, a detailed plan view of the cover 14 is shown, and the predetermined fracture region 88 is more clearly visible in each case.

[0148] In Figure 15, the predetermined fracture region 88 is designed with several parts, and in this example, it has eight parts, each of which extends radially outward substantially linearly from center point 134 to center point 134, thereby forming a star pattern in the fracture region 88. Thus, the predetermined fracture region 88 represents an overall symmetrical, in this case point-symmetric pattern.

[0149] In Figure 16, the predetermined fracture region 88 has four parts, which in this case extend substantially linearly radially outward from the center point 134, thereby representing a cross-shaped pattern that is symmetrical with respect to the center point 134.

[0150] The predetermined fracture region 88 shown in Figure 17 is formed within a linearly extending dash symbol.

[0151] In the embodiment shown in Figure 18, a predetermined break region 88 is formed by a circular demarcation that can be designed as a continuous line or perforation. The line or perforation separates the predetermined break region 88 from further areas of the cover 14 outside the line or perforation.

[0152] In the embodiment shown in Figure 19, a predetermined fracture region 88 is defined by a substantially semicircular line, which can then be designed as a perforation or a continuous line.

[0153] Figure 20 is a side view and a top view of a further embodiment of the cartridge 10 having two film pouches 18, the film pouches 18 being connected to the head portion 12 in a general welding process. An essentially rigid insert 16 is first connected to the film pouches 18, and then filled with composition 102 through the passage 60. Here again, the passage 60 is then closed with a cover 14, the cover 14 being connected to the insert 16 in the manner described in more detail above, and in particular welded thereon.

[0154] Here, the cover 14 is designed to be welded on both sides so that the film pouch 18 is connected to the head portion 12 in a further step. In the embodiment according to Figure 20, this can be done on both film pouches 18 using a common welding tool 136, and in the embodiment according to Figure 21, it can be done on each film pouch 18 using two separate welding tools 138, 140, and thus independently of each other, with one welding tool 138 associated with one film pouch 18 and the other welding tool 140 associated with the other film pouch 18.

[0155] In this case, the insert 16 has an opposite contour corresponding to the head portion 12 such that when connected to the head portion 12, the insert 16 is substantially flat on the head portion 12 via the cover 14.

[0156] Each welding tool 136, 138, and 140, shown schematicly only in Figures 20 and 21, is guided on the film pouch 18 from the side facing away from the head portion 12 to the contact area of ​​the head portion 12 with the insert 16. In the embodiment according to Figure 21, the welding tools 138 and 140 completely surround a particular film pouch 18 and the corresponding contours of the insert 16 and head portion 12, thus, in each case, creating a connection that extends completely around the circumference between the head portion 12 and the film pouch 18 via the cover 14. Two film pouches 18 can be connected to the head portion 12 simultaneously, partially overlapping, or successively.

[0157] In the embodiment shown in Figure 20, a general welding tool 140 that can connect two film pouches 18 to the head unit 12 in a single step has the film pouches 18 positioned, for example, around the circumference of the film pouches 18 excluding the areas facing each other, and thus creates a connection between the head unit 12 and the two film pouches 18 via their respective covers that extends entirely around the outside of both film pouches 18. In this case, in the areas where the two film pouches 18 face each other, the insert 16 may not be connected to the head unit 12 via the cover 14.

[0158] To connect the head portion 12 to the insert 16, or to a plurality of inserts 16, an inductive, non-contact welding process, such as a high-frequency welding process, is preferably provided. The cover 14 preferably has an aluminum layer that is heated during the welding process, and the heat is conducted through other layers of the cover 14 to the insert, and the head portion 12, which are made of a plastic material in particular, thereby achieving welding. In this case, a highly targeted energy input is achieved at the point where the welded connection is to be created.

[0159] Various embodiments of individual components should be understood as examples. In particular, the various designs and features of the embodiments can be combined with each other as desired. The features and designs listed as differences are independent and can be combined in various ways.

[0160] In the shown embodiment, the cartridge 10 comprises one or two chambers 20 and a corresponding number of covers 14, inserts 16, film pouches 18, receiving sections 66, and exit channels 80. Generally, any number of the aforementioned components is possible.

Claims

1. A cartridge (10) for a dispensing device, A non-rigid, elongated film pouch (18) having a chamber (20) filled with composition (102), Head section (12) and It has a rigid insert (16), The insert is connected to the side of the film pouch (18) facing the head portion (12), The insert has a passage (60) that communicates with the chamber (20) and is closed by the cover (14), The insert (16) has a conical surface (46) on the side facing the head portion (12) and is connected to the head portion (12). A cartridge (10) characterized in that the cover (14) is sealed to the surface (46) of the insert (16).

2. The cartridge (10) according to claim 1, characterized in that the surface (46) of the insert (16) facing the head portion (12) has an angle (ε) of 10° to 50° with the horizontal (H).

3. The cartridge (10) according to claim 2, characterized in that the angle (ε) has a value of 15° to 35°.

4. The cartridge (10) according to claim 3, characterized in that the angle (ε) is 25°.

5. The cartridge (10) according to any one of claims 1 to 4, characterized in that the cover (14) has a predetermined fracture region (88).

6. The insert (16) has at least one ventilation opening (112) independent of the passage (60), and / or at least one ventilation slot (116) independent of the passage (60), and / or The cartridge (10) according to any one of claims 1 to 5, characterized in that the passage (60) of the insert (16) has at least one ventilation notch (122) in a region facing the central axis of the film pouch (18).

7. The insert (16) and the head portion (12) each have interacting contours within their respective face-to-face regions, and these contours are mirror-symmetrical. The cartridge (10) according to any one of claims 1 to 6, characterized in that the cover (14) located within the region of the contour is weldable.

8. The cartridge (10) according to any one of claims 1 to 7, characterized in that the film pouch (18) is formed by a cylindrical film tube (26) whose bottom is closed by a base portion (24) which is adhered to and / or welded to the cylindrical film tube (26).

9. A method for manufacturing a cartridge (10) for a dispensing device according to any one of claims 1 to 8, - A step of preparing a film pouch having a chamber (20), - The step of connecting the film pouch to a dimensionally stable insert (16), - A step of filling the chamber (20) with the composition (102) through the passage (60) of the insert (16), - The step of closing the passage (60) with the cover (14), - A method comprising the step of connecting the insert (16) to the head portion (12).

10. The method according to claim 9, characterized in that a predetermined fracture region is generated within the area of ​​the cover.

11. The method according to claim 10, characterized in that the predetermined fracture region (88) of the cover (14) is produced by laser, hot stamping to weaken it, scoring, or by welding the cover (14) to the insert (16) to close the passage (60).

12. The method according to any one of claims 9 to 11, characterized in that the insert (16) has at least one material extension (54) on its surface (46), the material extension (54) surrounds the passage (60) and melts while the cover (14) closes the passage (60).

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