Cartridge with tubular bag and method for using the cartridge

Abstract

The invention relates to a cartridge (1) for a viscous material, which can be inserted into a cartridge gun (100) or the like and comprises: a) a cylindrical cartridge body (10) defining a cavity, with a proximal end (11) and a distal end (12); b) a cartridge cap (20) arranged at the distal end (12) of the cartridge body (10), having a dispensing outlet (21) and to which a hollow cylinder (72) with an end face (76) is associated, wherein a longitudinal axis of the hollow cylinder (72) extends parallel to a longitudinal axis (2) of the cartridge body (10) and wherein the hollow cylinder (72) projects into the cavity of the cartridge body (10); c) a tubular bag (40) arranged in the cavity of the cartridge body (10) for storing the viscous material, wherein the tubular bag (40) comprises a bag film (41) which, in a closed state of the tubular bag (40), at least at a first bag end (41),that is facing the cartridge cap (20), is held together in a sausage-like manner by a closure, preferably in the form of a clip (43), and d) a piston unit (50) with a piston (52) which can be moved along the longitudinal axis (2) of the cartridge body (10), wherein by moving the piston (52) the first end of the bag (42) is pressed against the end face (76) of the hollow cylinder (72) and in an open state of the tubular bag (40) the viscous material can be dispensed from the tubular bag (40) through the dispensing outlet (21). The invention is characterized in that a free space (77) is formed within the hollow cylinder (72) which is free of piercing points or cutting elements, so that in the closed state of the tubular bag (40) a pressure builds up by pressing against the end face (76) in the first bag end (42), by which the clip (43) is separated from the bag film (41),without slitting or puncturing the bag film (41). Furthermore, the invention relates to a method for using this cartridge (1).

Description

[0001] The invention relates to a cartridge for a viscous material that can be inserted into a cartridge gun. Furthermore, the invention relates to a method for using such a cartridge.

[0002] For both professional applications and private use, various viscous materials, such as silicone, acrylic and adhesives, are typically supplied in cartridges from which the material can be dispensed using a cartridge gun.

[0003] EP 4 241 894 A1 discloses a cartridge comprising a cylindrical cartridge body that defines a cavity. The cartridge body has a proximal end and a distal end. A cartridge cap with a dispensing outlet is arranged at the distal end of the cartridge body. A pouch for storing the viscous material is arranged in a cavity of the cartridge body. The pouch comprises a film which, when the pouch is closed, is held together at a first end, facing the cartridge cap, by a clip in a sausage-like fashion. The film is also gathered at a second end of the pouch by a clip in a sausage-like fashion, so that the pouch has a sausage shape. The cartridge of EP 4 241 894 A1 further comprises a piston assembly with a piston that can be displaced along the longitudinal axis of the cartridge body.By moving the piston, the viscous material can be dispensed from the sausage bag through the dispensing outlet while the sausage bag is open.

[0004] The cartridge body of EP 4 241 894 A1 has several cutting rods or blade tips. These cutting rods are designed to cut or slit the pouch at the first end when the plunger is pressed against the cartridge cap during initial use of the cartridge. This allows the pouch to be inserted into the cartridge body while still closed. Therefore, it is not necessary to remove the cartridge cap from the cartridge body before first use to access the first end of the pouch and cut it open with a separate knife or scissors.

[0005] To ensure reliable opening of the first end of the pouch, EP 4 241 894 A1 teaches the use of a compression ring in the form of a hollow cylinder as part of the cartridge cap. A longitudinal axis of the hollow cylinder runs parallel to and coincides with the longitudinal axis of the cartridge body. The hollow cylinder projects into the cartridge body, and the cutting rods for slitting the pouch are located inside the hollow cylinder. By pressing the pouch against an end face of the hollow cylinder, the pouch is deformed in such a way that high internal pressure builds up in the first end of the pouch, and especially in the area inside the hollow cylinder. This results in the cutting rods coming into contact with the pouch in an area where the pouch film is particularly taut and stretched due to the hollow cylinder. The pouch film is not merely punctured at a single point, but actually bursts open.

[0006] Although the hollow cylinder, in conjunction with the cutting rods, generally opens the pouch sufficiently wide at the first end to allow for easy dispensing of the viscous material, it cannot be ruled out that individual cartridges, or even a significant proportion of the tested cartridges, may not produce sufficiently large holes in the pouch. Consequently, dispensing the viscous material may then be difficult or require considerable force.

[0007] The object underlying the invention is to provide a cartridge from which the viscous material can be dispensed easily and reliably using a conventional cartridge gun.

[0008] The problem underlying the invention is solved by the subject matter according to claim 1. Exemplary embodiments can be found in the dependent claims to claim 1.

[0009] According to the invention, a free space is formed within the hollow cylinder, which is free of piercing points, cutting elements or the like, so that in the closed state of the tubular bag, pressure builds up in the first end of the bag by pressing against the end face, is separated from the bag film by the closure or is opened, without the bag film being slit, cut or punctured.

[0010] In one embodiment, the closure is a clip, preferably made of metal or plastic, which is then separated from the bag film according to the invention. Alternatively, the bag film can also be closed using other closures, such as an O-ring (rubber, metal, paper) or a plastic binder clip. It is also conceivable that the closure is formed by welding, sealing, or gluing.

[0011] Application tests have shown that opening the first end of the pouch does not require cutting or slicing. Since the pouch film is not slashed at this end, the internal pressure, facilitated by the hollow cylinder, can increase sufficiently to strip or break off the clip that holds the pouch film together at the sausage-shaped end. Because the pouch film is then completely separated from the clip and no longer held together by it, an opening is created at the first end of the pouch, the size and shape of which are easily predictable. When a large number of identical cartridges are tested, the resulting opening exhibits virtually no variation. Due to the dimensions of the hollow cylinder (in one embodiment, these are a diameter and a height of the hollow cylinder), the pouches always have an almost identical opening.This allows the viscous material to be dispensed from each cartridge with the same and comparatively low force. This simplifies the handling of the cartridge.

[0012] Thus, the invention takes a completely different approach than that taught in the prior art. While EP 4 241 894 A1 aims to create sufficiently large openings by slitting or cutting the bag film, the invention seeks to avoid slitting or cutting the bag film altogether, so that sufficient pressure can build up to detach the clip and the pressure does not collapse prematurely due to the slitting / cutting. Even if the force required to detach the clip is greater than the force needed to cut or slit an opening in the bag film, the cartridge according to the invention allows for precise dispensing of the viscous material.A slightly greater maximum force required to open the pouch by separating the clip from the pouch film results in a consistently uniform opening at the first end of the pouch, ensuring that dispensing is always equally effective after opening.

[0013] The tubular bag can be made of plastic. It can also be made of siliconized or coated paper. The bag film can be single-layered or multi-layered. The term "bag film" is not intended to restrict the bag material to plastic.

[0014] The production of the tubular bag can be carried out in a continuous process in which the viscous material is filled into an endless tube. A clip blank is fed radially in according to the length of the bag, compressing the endless tube at the appropriate point. The compressed bag film is then held or fixed together by the clip created by closing the clip blank. After the clip has been attached, the section with the compressed bag film and the clip is separated from the remaining endless tube. This results in a sausage-shaped tubular bag with two sausage-like ends. A longitudinal seam, with or without an overlap, can extend between the two ends. It is also possible for the tubular bag to have no longitudinal seam, but rather a closed circumference from the time the bag film is extruded.

[0015] The term "cartridge gun or the like" in claim 1 represents a device that, by means of a pressure plate serving to bear against the piston of the cartridge, can exert axial pressure on the piston so that it moves along the longitudinal axis of the cartridge body to force the viscous material through the dispensing outlet. This device could, in principle, also be a hand-held dispenser into which the cartridge according to the invention can be inserted.

[0016] In one embodiment, the hollow cylinder has a circular cross-section. The cross-section of the hollow cylinder can also be oval or rectangular. For example, the cross-section can be a regular hexagon or octagon.

[0017] The longitudinal axis of the hollow cylinder can coincide with the longitudinal axis of the cartridge body. The hollow cylinder and the cartridge body can therefore be arranged coaxially.

[0018] In one embodiment, the end face of the hollow cylinder is a closed annular surface. It is also conceivable that the end face has a gap and / or interruptions.

[0019] Clip retainers may be provided upstream of the dispensing outlet to prevent the detached clip from entering the outlet and thus causing a blockage. These clip retainers may include a retaining ring that can be arranged concentrically upstream of the dispensing outlet.

[0020] The hollow cylinder can be connected to the retaining ring via a connecting cylinder. The diameter of the connecting cylinder can be larger than the diameter of the retaining ring and smaller than the diameter of the hollow cylinder.

[0021] The diameter of the hollow cylinder (in this case, its outer diameter is meant) can be 60 to 80% of the inner diameter of the cartridge body. In one embodiment, the diameter of the hollow cylinder is 65 to 70% of the inner diameter of the cartridge body. The height of the hollow cylinder is, in another embodiment, 40 to 80% or 50 to 70% of its diameter. The minimum height of the hollow cylinder can be 18 mm or 20 mm. With such dimensions, particularly with a combination of the values ​​given here for the diameter, height, and / or minimum height, the separation or stripping of the closure from the bag film, or the bursting or rupture of the closure according to the invention, can be readily achieved.

[0022] The connecting cylinder can be axially connected to the hollow cylinder. This means that the connecting cylinder and the hollow cylinder do not overlap axially, or only to a very small extent (less than 2 mm). The connecting cylinder can be connected to the hollow cylinder via radial webs. The radial webs can be evenly distributed around the circumference. For example, with three radial webs, the distance to each adjacent web can be 120°. The radial web bridges the radial distance between the connecting cylinder and the hollow cylinder.

[0023] In one embodiment, the hollow cylinder is part of a separate insert element that can be inserted into the cartridge cap. The separate insert element and the cartridge cap can therefore be manufactured separately and then assembled. It is also conceivable that the hollow cylinder and the cartridge cap are formed as a single piece. The hollow cylinder, the retaining ring, and the connecting cylinder can be formed as a single piece and together constitute the separate insert element.

[0024] The cartridge cap may have a receiving space for the connecting cylinder, which centers the insert element in the cartridge cap.

[0025] In one embodiment, the cartridge body has a wall extending from the distal end to the proximal end and is made of a plant fiber-based material. The sleeve can, for example, be made of cardboard, paper, or card stock. After separating the cartridge cap, piston unit, and pouch, the cartridge body can be disposed of with waste paper and thus reintroduced into the recycling loop. The cartridge body can already be made from recycled paper material, making the cartridge an even more sustainable product. While the plant fiber-based cartridge body can be printed, one embodiment omits any additional coating of another material such as plastic or aluminum to facilitate efficient recycling.According to an alternative version, the cartridge body, made of paper or cardboard, may have a moisture-repellent coating to protect against moisture.

[0026] The proximal end may have a proximal butt joint. The distal end may have a distal butt joint, whereby at least one butt joint of the cartridge body may be covered by a section of material attached to the cartridge body. The material section covering the butt joint rests against both the inner and outer surfaces of the wall in an area adjacent to the butt joint. In this way, it can be prevented or at least made more difficult for moisture to penetrate directly into the cartridge body material via the otherwise exposed butt joints, which would lead to rapid swelling of the fibers and thus destabilization of the material.

[0027] The cartridge body can be manufactured as a coiled sleeve. The cartridge body may include a tear-off aid designed as a material weakening feature, extending into the wall from the distal or proximal end. This tear-off aid facilitates tearing open the cartridge body and thus easier separation from plastic components located within the cavity, such as an empty tubular bag.

[0028] In one embodiment, the piston comprises an outer piston, an inner piston, and an expanding ring. The outer piston is expanded radially by the expanding ring when the inner piston is pressed against the expanding ring or the outer piston by the cartridge gun. The inner piston may have a piston body in which at least one slot is provided, extending axially from the preferably unslotted expanding ring to a mounting surface for a pressure plate of the cartridge gun. Due to the slot, which can expand or contract during operation of the cartridge in the cartridge gun, the inner piston exhibits a certain degree of compliance, so that an angular or positional misalignment of the pressure plate acting on the inner piston is not, or not completely, transmitted to the outer piston.In other words, due to its flexibility, the inner piston can at least partially compensate for the angular and / or positional misalignment of the pressure plate, ensuring that the outer piston remains aligned against the inside of the cylindrical cartridge body in such a way that bulging or other damage to the cartridge body does not occur. Consequently, the cartridge body does not need to withstand such high forces, allowing it to be made of thin-walled and / or relatively soft material.

[0029] Another object of the invention, the provision of a method for using the cartridge described above, is solved by the combination of features according to claim 14.

[0030] According to the invention, when using the cartridge described above, the tubular bag is placed in the cartridge body in the closed state or has already been placed in the cartridge body at the factory, the piston is moved along the longitudinal axis, whereby the first end of the bag is pressed against the end face of the hollow cylinder, whereby pressure is generated at the first end of the bag by which the clip is separated from the bag film without the bag film being slit, punctured or cut open before or during the separation of the clip.

[0031] The invention will be explained in more detail with reference to the embodiment shown in the drawing. The drawing shows: Figure 1: a cartridge with a suggested cartridge gun; Figure 2: a cartridge body and a sausage pack; Figure 3: a cartridge cap with insert element; Figure 4: a longitudinal section along line AA in Figure 3Figure 5: the cartridge cap and the insert element in a perspective exploded view; Figures 6 and 7: various perspective views of the insert element; Figure 8: the insert element in a slightly modified form from below; Figure 9: the insert element of the Figure 8 from the side; Figure 10 the insert element of the Figure 8 from above; Figure 11 a piston unit from the side; Figure 12 a longitudinal section along line AA in Figure 11 Figure 13 shows the piston unit in longitudinal section in the assembled state.

[0032] Figure 1Figure 1 shows a cartridge, designated as a whole by 1. The cartridge comprises a cylindrical cartridge body 10 with a proximal end 11 and a distal end 12. The cartridge body 10 is made of paper or cardboard as a wound sleeve. A cartridge cap 20 with a dispensing outlet 21 is arranged at the distal end 12. The cartridge cap 20 is a separate component that can be securely connected to the distal end 12 of the cartridge body 10. A dispensing nozzle 23 can be screwed onto an external thread 22 of the dispensing outlet 21. The tip of the dispensing nozzle 23 can be cut at various axial locations to obtain a desired outlet cross-section.

[0033] The cartridge body 10 defines a cavity designed to hold a tubular bag 40 (see Figure 2The tubular bag 40 contains a viscous or pasty material, for example, silicone, acrylic, a sealant, or an adhesive. The tubular bag 40 has a film 41 which is held together at a first end 42 by a clip 43, preferably made of metal, but also of other materials such as rubber, plastic, or paper, in a sausage-like manner. At a second end 44, the film 41 is also held together in a sausage-like manner by another clip 45, so that the tubular bag 40 has the shape of a sausage with two sausage-like ends. Folds 46 are formed at the ends 42 and 44 in the film 41 due to the cinching. A small overhang 47 on the clip 43 is a few millimeters, for example, 2 to 6 mm.The clip 43 can be formed from a wire or rod-shaped clip blank, which is bent into an approximately round clip with a circumference within which the bag film 41 is then held compressed. A force-fit exists between the bag film 41 and the clip 43. If a sufficiently high force is applied to it, the clip 43 slides along the projection 47 until it is completely separated from the bag film.

[0034] Cartridge 1 also includes a piston unit 50, which is in Figure 1 is essentially concealed by the cartridge body 10. Only a small part of the connecting piece 51, which is firmly attached to the proximal end 11 of the cartridge body 10, is visible. The piston unit 50 has a piston 52 (see the Figures 11 to 13) which can be moved along a longitudinal axis 2 of the cartridge body 10. In an initial state, the axially movable piston 52 is connected to the fixed connecting piece 51 via thin connecting webs 53, which are designed as predetermined breaking points. By axially moving the piston 52, the viscous material from the foil pouch 40 can be dispensed through the dispensing outlet 21. However, the originally closed foil pouch 40 and the dispensing outlet 21 must first be opened. The pressure required for dispensing on the piston 52 can be provided by a standard cartridge gun 100, of which in Figure 1 Only a pressure plate 101 and a push rod 102 are shown as examples. A more detailed description of the piston unit 50 follows below.

[0035] The Figures 3 to 5The cartridge cap 10 and a separate insert element 70, which can be inserted into the cartridge cap 10, are shown. The separate insert element 70 is in the Figures 6 to 10 shown in a unique position.

[0036] The dispensing opening 24, defined by the dispensing outlet 21, is closed by a breakable resealing element 25. The resealing element 25 is initially fixed to the dispensing outlet 21 and closes the dispensing opening 24, thus protecting it before the cartridge 1 is put into operation. The connection between the resealing element 25 and the cartridge cap 20 includes four predetermined breaking points, which can be broken by a user of the cartridge 10 to separate the resealing element 25 from the cartridge cap 20. The resealing element 25 is conical or tapered and projects into the dispensing opening 24 with a conical tip 26. After separation from the cartridge cap 20, the resealing element 25 can be used as a closure for the dispensing opening 24 or as a closure for the dispensing nozzle 23.

[0037] The cartridge cap 20 is essentially rotationally symmetrical and has a stepped shoulder section 27 that connects the dispensing outlet 21 and a compression ring 28. The compression ring 28 has circumferential claw elements 29 on its outer circumference, which engage with the paper material of the cartridge body 10 to securely fasten the cartridge cap 20 to the cartridge body 10. The diameter of the compression ring 28 corresponds approximately to the inner diameter of the cartridge body 10. An outer circumferential rim 30 of the shoulder section 27 forms an axial contact surface for the cartridge body 10.

[0038] The stepped shoulder section 21 forms a cylindrical receiving chamber 28 for the insert element 70. In particular, the receiving chamber 28 serves to center the insert element 70 in the cartridge cap 20. In an assembled state (see Figure 4A connecting cylinder 71 of the insert element 70 is coaxially seated in the cylindrical receiving space 28. The connecting cylinder 71 connects a hollow cylinder 72 and a retaining ring 73. The hollow cylinder 72, the connecting cylinder 71, and the retaining ring 73 are arranged coaxially and have a common central axis, which, when assembled, coincides with the longitudinal axis 2 of the cartridge body 10. The connecting cylinder 71 has a diameter that is smaller than the diameter of the hollow cylinder 72 and larger than the diameter of the retaining ring 73. The retaining ring 73 is connected to the connecting cylinder 71 via three radial ribs 74. The connecting cylinder 71, in turn, is connected to the hollow cylinder 72 via three radial webs 75. The connecting cylinder 71 and the hollow cylinder 72 do not overlap axially along the longitudinal axis 2.The diameter of the hollow cylinder 72, or more precisely an outer diameter of the hollow cylinder 72, is 60 to 80%, preferably 65 to 75% of the diameter of the press ring 28, or 60 to 80%, preferably 65 to 75% of the inner diameter of the cartridge body 10.

[0039] The hollow cylinder 72 projects along the longitudinal axis 2 into the cavity of the cartridge body 10. The hollow cylinder 72 has an annular circumferential end face 76. A clearance 77 is formed within the hollow cylinder 72, in which there are no piercing points, cutting elements, or the like that could serve to slit the pouch 40 at the first pouch end 42 when the pouch 40 is pressed against the cartridge cap 20. In the illustrated embodiment, the clearance extends over the entire axial length of the hollow cylinder 72.

[0040] As described below, the hollow cylinder 72 serves to ensure that the closed bag end 42 (see Figure 2 ) to open automatically without slashing or puncturing the pouch film 41. When the piston 52 is moved, the first pouch end 42 is pressed against the end face 76 of the hollow cylinder 72. The annular end face 76 divides the first pouch end 41 into an outer and an inner area, the inner area being located radially inside the hollow cylinder 72. The outer area extends radially outwards from the end face 76 to the inner diameter of the cartridge body 20, assuming that the inner diameter of the cartridge body 20 is approximately equal to the diameter 48 of the pouch 40.

[0041] With sufficiently high axial pressure from the piston 52, the outer surface of the first bag end 42 slides along the outside of the hollow cylinder and into the annular gap between the hollow cylinder 72 and the compression ring 28. Simultaneously, the internal pressure in the inner area of ​​the first bag end 42 increases, resulting in a large tensile force acting on the bag film 41 or on the protrusion 47 (sausage end). This tensile force becomes so great that, despite the clamping force between the bag film 41 and the clip 43, the bag film 41 is pulled along the clip 43, causing the protrusion 47 to become progressively shorter until the clip 43 is completely separated from the bag film 41. Since the bag film 41 is no longer held together at the first bag end 42 by the clip 43, the bag end 42 opens.In contrast to slitting or piercing, a very large opening is suddenly created at the first end of the bag 42, so that the viscous mass can be dispensed without significant flow resistance.

[0042] Since the clip 43 is now completely separated from the pouch film 41, it is pressed towards the dispensing outlet 21 by the viscous material. The retaining ring 73, or rather its position in the receiving chamber of the cartridge cap 20, prevents the clip 43 from entering the dispensing opening 24 and clogging it. The insert element 70 thus serves not only to open the pouch 40 but also to catch the clip 43. The insert element 70 could therefore also be described as a clip catcher.

[0043] The connecting cylinder 71 can have a circumferential detent 77 on its outer side, which interacts with a circumferential detent lip 31 on the inner side of the stepped shoulder part 27. Through the interaction of the detent lip 31 and the detent 77, the insert element sits securely in the cartridge cap 20.

[0044] The piston 52 of the piston unit 50 has an inner piston 54, an outer piston 55 and a frustoconical expanding ring 56, which is integrally formed on the inner piston 54. Figures 11 to 13 The figures show the piston unit 50 in its initial state, in which the connecting webs 53 have not yet been cut. Figures 11 and 12 The inner piston 54 and the outer piston are shown separately. Figure 13 shows the piston unit in its assembled initial state, in which the inner piston 54 is partially and the expanding ring 55 is completely located in an interior space 57 of the outer piston 55.

[0045] The inner piston 54 has a piston body 58. A slot 59 is provided in the piston body 58, extending axially (along the longitudinal axis 2) from the expanding ring 56 to a mounting surface 60 for the pressure plate 101 of the piston gun 100; the circumference of the piston body 58 is completely interrupted by the slot 59. Figure 12 It becomes clear that the slot 59 extends to the spreading ring 56, but does not open its closed circumference.

[0046] Due to the slot 59, the inner piston 54 is flexible and therefore does not transmit, or only mitigates, stresses or unwanted forces resulting from an inclined and / or off-center pressure plate 101 to the outer piston 55. The outer piston 55 can therefore be guided more easily longitudinally through the cartridge body 10. Damage to the cartridge body 10 caused by larger radial forces from the outer piston 55 can thus be avoided, even if the wall thickness of the cartridge body 10 is small and / or a soft material such as paper or cardboard is chosen for the cartridge body.

[0047] The axial pressure expands the expanding ring 56, thereby pressing the outer piston 55 with its sealing lips 61 against the inside of the cartridge body 10 to create a seal. A piston base 62 of the outer piston 55 is slightly convex and has an opening / recess 63 for receiving the clip 45 (see figure). Figure 2 ) on. The piston base 62 can also assume a different shape, which can influence the pressure distribution in the tubular bag 40 and thus also the pressure distribution in the first bag end 42 when this is pressed against the end face 76 of the hollow cylinder 72.

[0048] Circumferential claw elements 64 are provided on one outer side of the connecting element 51 for secure connection with the proximal end 11 of the cartridge body 10. An end stop 65 of the connecting element 51 ensures axial fixation with respect to the cartridge body 10. Reference symbol list

[0049] 1 Cartridge 2 Longitudinal axis 10 Cartridge body 11 Distal end 12 Proximal end 20 Cartridge cap 21 Dispensing outlet 22 External thread 23 Dispensing nozzle 24 Dispensing opening 25 Resealable part 26 Tip 27 Shoulder part 28 Compression ring 29 Claw element 30 Edge 30 Locking lip 40 Pouch 41 Pouch film 42 First pouch end 43 Clip 44 Second pouch end 45 Clip 46 Fold 47 Protrusion 50 Piston unit 51 Connector 52 Piston 53 Connecting bridge 54 Inner piston 55 Outer piston 56 Expanding ring 57 Interior 58 Piston body 59 Slot 60 Mounting surface 61 Sealing element 62 Piston base 63 Opening / recess 64 Claw element 65 End stop 70 Insert element 71 Connecting cylinder 72 Hollow cylinder 73 Retaining ring 74 Radial rib 75 Radial web 76 End face 77 Clearance

Claims

1. Cartridge (1) for a viscous material, which can be inserted into a cartridge gun (100) or the like and comprises: - a cylindrical cartridge body (10) defining a cavity, with a proximal end (11) and a distal end (12); - a cartridge cap (20) arranged at the distal end (12) of the cartridge body (10), having a dispensing outlet (21) and to which a hollow cylinder (72) with an end face (76) is associated, wherein a longitudinal axis of the hollow cylinder (72) extends parallel to a longitudinal axis (2) of the cartridge body (10) and wherein the hollow cylinder (72) projects into the cavity of the cartridge body (10);- a tubular bag (40) arranged in the cavity of the cartridge body (10) for storing the viscous material, wherein the tubular bag (40) comprises a bag film (41) which, in a closed state of the tubular bag (40), is held together at least at a first bag end (41) facing the cartridge cap (20) by a sausage-like closure, - a piston unit (50) with a piston (52) which can be displaced along the longitudinal axis (2) of the cartridge body (10), wherein by displacing the piston (52) the first bag end (42) is pressed against the end face (76) of the hollow cylinder (72) and, in an open state of the tubular bag (40), the viscous material can be dispensed from the tubular bag (40) through the dispensing outlet (21), ; characterized by the fact thatwithin the hollow cylinder (72) a free space (77) is formed which is free of piercing points or cutting elements, so that in the closed state of the tubular bag (40) a pressure builds up by pressing against the end face (76) in the first bag end (42), by which the closure is opened or separated from the bag film (41) without the bag film (41) being slit or punctured.

2. Cartridge (1) according to claim 1, characterized by the fact that the closure is designed as a clip (43).

3. Cartridge (1) according to claim 1 or 2, characterized by the fact that the hollow cylinder (72) has a circular cross-section.

4. Cartridge (1) according to one of claims 1 to 3, characterized by the fact that the longitudinal axis of the hollow cylinder coincides with the longitudinal axis (2) of the cartridge body (10).

5. Cartridge (1) according to any one of claims 1 to 4, characterized by the fact that the end face (76) represents a closed ring surface.

6. Cartridge (1) according to claim 2 and one of claims 1, 3 to 5, characterized by the fact that Clip retaining means are provided in front of the dispensing outlet (21) which prevent the detached clip (43) from entering the dispensing outlet (21).

7. Cartridge (1) according to claim 6, characterized by the fact that The clip retaining means comprise a retaining ring (73) which is arranged concentrically in front of the dispensing outlet (21).

8. Cartridge (1) according to claim 7, characterized by the fact that the hollow cylinder (72) is connected to the retaining ring (73) via a connecting cylinder (71), wherein a diameter of the connecting cylinder (71) is larger than a diameter of the retaining ring (73) and smaller than a diameter of the hollow cylinder (72).

9. Cartridge (1) according to claim 8, characterized by the fact that the connecting cylinder (71) is axially connected to the hollow cylinder (72) and is connected to the hollow cylinder (72) via radial webs (75).

10. Cartridge (1) according to any one of claims 1 to 9, characterized by the fact thatthe hollow cylinder (72) is part of a separate insert element (70) which can be inserted into the cartridge cap (20).

11. Cartridge (1) according to claim 8 or 9 as well as according to claim 10, characterized by the fact that the cartridge cap (20) has a receiving space (28) for the connecting cylinder (71) by which the insert element (70) is centered in the cartridge cap (20).

12. Cartridge (1) according to any one of claims 1 to 11, characterized by the fact that the cartridge body (10) has a wall extending from the distal end (12) to the proximal end (11) and is made of a material based on plant fibers.

13. Cartridge (1) according to any one of claims 1 to 12, characterized by the fact thatthe piston (52) has an outer piston (55), an inner piston (54) and an expanding ring (56), wherein the outer piston (55) is expanded in a radial direction by the expanding ring (56) when the inner piston (54) is pressed against the expanding ring (56) or the outer piston (55) by the cartridge gun (100), wherein the inner piston (54) has a piston body (58) in which at least one slot (59) is provided, which extends in an axial direction from the preferably unslotted expanding ring (56) to a mounting surface (60) for a pressure plate (101) of the cartridge gun (100).

14. Method for using the cartridge (1) according to any one of claims 1 to 13, wherein the tubular bag (40) is placed in the cartridge body (10) in the closed state, the piston (52) is moved along the longitudinal axis (2), the first bag end (42) is pressed against the end face (76) of the hollow cylinder (72), pressure is generated at the first bag end (42) by which the closure is opened or separated from the bag film (41) without the bag film (41) being slit or punctured before or during the separation of the clip (43).

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