Cartridge for receiving and processing building materials

Abstract

The invention relates to a cartridge for receiving and processing building materials, comprising a cartridge cylinder, a cartridge head which can be releasably placed on the end face of the cartridge cylinder, a tubular bag with building material contained therein, and a displaceable plunger-like cartridge base, wherein the cartridge cylinder is formed as a cardboard sleeve (1) and the cartridge base is formed as a cardboard plunger (2), wherein the cardboard plunger (2) forming the cartridge base is formed annularly, consisting of a cardboard plunger sleeve (7), which can be displaced resting circumferentially tight against the inner wall of the cardboard sleeve (1) forming the cartridge cylinder, and an underside beading (6) which is formed integrally from the cardboard plunger sleeve (7) itself by way of beading.

Description

[0001] Cartridge for collecting and processing building materials

[0002] The invention relates to a cartridge for holding and processing building materials such as sealants, silicones or adhesives.

[0003] It is known in the art to contain such building materials in cylindrical cartridges so that they can be removed via a corresponding outlet in the form of a spout attached to the cartridge head. For this purpose, this cartridge is usually manufactured as a disposable product consisting of a plastic tube with an integral, closed cartridge head into which the material to be processed is poured. The end of this cartridge is then tightly sealed with a cartridge base.

[0004] To remove the building material from the cartridge, the cartridge is inserted into an ejection tool in the form of a cartridge gun or similar device and subjected to pressure from a manually operated pressure ram, for example, which rests on the movable cartridge base inside the cartridge and presses the viscous building material out of the cartridge for processing. Another advantage of this solution is its ease of handling, as the cartridge can simply be inserted sideways into the cartridge gun and is released again by returning the pressure ram, which is usually mounted on a rack inside the cartridge.

[0005] Manually operated half-shell presses are well-known and widely used. These presses feature a rack for moving the pressure ram and a half-shell for holding the cartridges, into which the cartridge is firmly clamped. In more complex and professional versions, the pressing is no longer done manually, but are usually fully mechanized devices that move the pressure ram, for example, using compressed air or an electric motor.

[0006] For the function of such a cartridge, tightness with a view to storage life is important because the building material usually reacts with the ambient air and leads to hardening of the building material in the cartridge. The advantages of this type of disposable product cartridge, which is widely available on the market, are its good storage life, product presentation and good processability even for laypeople via the nozzle attached to the cartridge, whereby the feed of the pressure stamp into the cartridge can be easily controlled. The mechanical manual movement is particularly common in amateur applications, although electric and pneumatic drives are common alternatives in professional trades.

[0007] However, a very obvious disadvantage of this practice is that the disposable cartridges are cylindrical plastic bodies and therefore problematic both in terms of production and disposal. Especially in light of the generally increased efforts to reduce the use of plastic products, both to conserve resources during production and to avoid the resulting waste, alternatives are urgently needed.

[0008] This disposal issue is made even more difficult by the fact that leftover building material, which often hardens in the cartridge head of these disposable cartridges and thus remains in these cartridges, prevents sensible waste separation and so disposal is only possible as residual or hazardous waste. This is due in particular to the fact that the cartridge head, on which the nozzle-like nozzle for applying the material pressed from the cartridge is located, is filled with hardened building material through use. This means that recycling and, in particular, separate disposal of the cartridge is not possible. Since in disposable cartridges the cartridge head is firmly connected to the rest of the cartridge body as an integral component, these components can only be separated from one another by cutting it open and thus destroying the cartridge.Reuse as a starting material or as a raw material for new plastic products is therefore excluded.

[0009] The prior art publication DE 41 39 744 A1 already discloses a cartridge for holding, for example, sealing compounds or adhesives, which is intended to be reusable. For this purpose, the front outlet nozzle of this design is inserted into the cartridge cylinder as a separate component and is supported on the inside of the open end wall of the cartridge body, but is thus not formed integrally with it, for example, as a plastic component.

[0010] After the building material contained in the cartridge has been pressed out, according to this invention, the remainder of the mass still in the cartridge can be pushed back to the rear end of the cartridge with the outlet nozzle and removed from the rear. The outlet nozzle inserted into the cartridge cylinder, as well as the piston for pressing the building material out of the cartridge, can thus be detached from the cartridge cylinder, which can then be reused. Only the outlet nozzle and the piston are not recyclable, as they are contaminated with the pressed-out building material.

[0011] While this is a theoretical improvement over disposable cartridges, as it at least allows the plastic cylinder of the cartridge to be separated from the building material it contains, in practice it is difficult to actually press the outlet nozzle back through the elongated plastic cylinder to the open end of the cartridge, depending on which ingredients are still cured and in what quantity. With adhesives or silicones, for example, it is difficult to push back the outlet nozzle that is attached to the front wall of the plastic cylinder, as the remaining building material and the cartridge base, which acts as a piston, also have to be pushed out.

[0012] Another disadvantage is that it must be assumed that the plastic cylinder cannot be recycled without extensive reprocessing and cleaning, as it comes into direct contact with the building material. Finally, it is disadvantageous that, like disposable cartridges, this type of cartridge often hardens with a significant amount of material that can no longer be processed. Therefore, the contents of the cartridge can only be partially removed because any remaining material that can still be processed cannot be accessed.

[0013] Another alternative to the described disposable cartridges are tubular containers, which are particularly popular in professional applications in more complex tubular bag guns. Tubular bag guns have been developed for this purpose as special intake and discharge devices that allow the compound to be removed from these transport tubes. This can be seen as an improvement over disposable cartridges in that the waste volume of the tubes remaining after the contained building compound has been pressed out is significantly lower than is the case with disposable cartridges.

[0014] One disadvantage, however, is that special tubular bag guns as pick-up and dispensing devices are complex and expensive to manufacture, which is why they are primarily used in the professional sector. A further problem lies in the transport and storage of these building material hoses because they cannot be stored upright, for example, and the hoses themselves are not as robust as a plastic cartridge. This is particularly problematic because if a single hose is destroyed, for example during transport, a large number of other building material hoses can be affected by contamination. It is therefore important to ensure that the transport and dispensing hoses used do not have walls that are too thin in order to rule out damage during storage and transport.This in turn increases the requirements for the device for receiving and discharging the contained mass as well as the amount of plastic used in the hose production.

[0015] Publication EP 23166808.8 describes a cartridge for containing and processing building materials, in which the cartridge body and cartridge base may be made of cardboard, with a cup jacket attached to the cartridge base, which fits tightly against the inner wall of the cartridge cylinder and is open at the front, or the cartridge base integrally comprises such a cup jacket, or a cup insert is slidably mounted on the cartridge base with the latter. The aim is thus to contain the emptied tubular film in this cup jacket so that it cannot get caught between the cartridge base, which acts as a movable piston, and the inner wall of the cartridge body.

[0016] In practice, it has been shown to be disadvantageous that this requires a cup jacket with a height which, on the one hand, negatively reduces the pressure on the inner wall of the cartridge body, but on the other hand also means a loss as far as the extrudable material is concerned, since the height of the cup jacket determines the distance to the cartridge head at the end of the cartridge emptying.

[0017] The disclosed invention of EP 3 936 454 A1 relates to a cartridge cap which can be mounted on a distal end of a cartridge body for use with an extrusion gun. In addition, a plurality of rods extend longitudinally from an inner surface of the cap body, at least one of which rods is suitable for piercing a flexible bag. In addition, a paper-based cartridge cylinder is disclosed. However, two aspects are disadvantageous here: firstly, the cartridge cap inserted into the cartridge, which does not offer any space for the compressed tubular bag, and secondly, the cartridge base, which, precisely because of its rounded transition area to the inner wall of the cartridge body, cannot reliably ensure secure guidance of the tubular bag to be compressed.

[0018] The same applies to the disclosure DE 9 116 065 U1, which also discloses a tubular bag solution, the inventive concept here being the sealingly inserted cartridge head, which also shows a paper-based cartridge cylinder. However, the disadvantage here too is that, on the one hand, the cartridge head sits firmly in the cartridge cylinder after emptying, preventing separation, and, on the other hand, the cartridge base leads to problems with controlled emptying of the tubular bag, since the emptied tubular bag can accumulate in the transition between the cartridge cylinder and the cartridge base and block it.

[0019] Against this background, the object of the cartridge according to the invention is, on the one hand, to create a cartridge for building materials that is suitable for both professional and amateur use and that advantageously combines the advantages of disposable cartridges with the advantages of tube storage for the building materials to be processed. The aim is therefore to be able to use a cardboard piston that reliably prevents the tubular film from penetrating between the cardboard sleeve of the cartridge and the movable cardboard piston as the cartridge base. For this purpose, the cardboard piston should have a high level of inherent stability and, at the same time, only a low height compared to a cup-like cardboard piston sleeve in order to be able to squeeze out the material contained in the film tube as completely as possible.The aim is to significantly improve the environmental compatibility of these products, in particular by increasing the proportion of recyclable and processable building material, on the one hand, and reducing waste volume when using this cartridge, on the other hand, at least through better separation of the cartridge's structural components. This should also be achieved while fully preserving the functionality and ensuring clean emptying of the tubular bag.

[0020] According to the invention, this is achieved by a cartridge having the characterising features of claim 1.

[0021] The further claims relate to advantageous embodiments of this invention.

[0022] The technical realization of the desired system consisting of a cardboard sleeve forming the cartridge with a piston which is slidably guided in this cardboard sleeve and which, for reasons of improved environmental protection, is also to be made completely and exclusively of cardboard, required further developments until a cartridge body which can actually be used in normal operation could be found.

[0023] The central problems here are, in particular, the film guidance of the film tube within the cartridge body during the compression process of the film bag. Compression of this tubular bag is problematic in that the film can slide into the space between the cartridge's inner wall and the movable piston, thus blocking the entire use of the cartridge. This leads to material loss and to incomplete removal of the material from the tubular bag, which runs counter to environmental protection.

[0024] Therefore, the task of the present further development of the product was, in particular, to achieve a clear improvement in the guidance of the tubular bag within the cartridge in a version with a cardboard sleeve and cardboard piston and at the same time to achieve good waste separation.

[0025] It is particularly advantageous in this case that, according to the invention, only two residual products remain after use, namely the cardboard sleeve with the cardboard piston pushed forward in the cardboard sleeve on the one hand, which can therefore be completely disposed of in the waste paper due to labelling, also with a paper label.

[0026] The second component is residual waste in the form of the plastic nozzle head, which is placed on or inserted into the cardboard tube and through which the product is extruded. The compressed film tube, with a minimal amount of residual material, is also pressed into this plastic nozzle head. This combination of plastic nozzle head, tubular bag, and residual contents can be disposed of together with the residual waste.

[0027] In this way, a completely problem-free and also in practice safely applicable solution is achieved, which advantageously transfers the environmental protection idea into practical work and does not mean too much effort of separation, which would otherwise lead in practical application to the separation of the waste components being dispensed with.

[0028] The advantages of the new development are therefore to be described below as a cardboard piston which is guided tightly and tightly along the cartridge inner wall via a sleeve-like outer edge which is guided tightly and tightly in the cardboard sleeve and which thus prevents the tubular bag or the emptied film portion from which the product has already been removed from slipping past.

[0029] As already mentioned in the prior art, a cup-like shape for the outer edge of this piston is provided in order to be able to guide the tubular bag. At the same time, the height of this sleeve should be selected so that it does not take up too much space when emptying the tubular bag, as it forms a spacer from the head of the cartridge. Therefore, this height should be designed as low as possible in order to ensure good guidance of the tubular bag and the emptied film, while at the same time being able to squeeze out the contents of the tubular bag as completely as possible.

[0030] The central feature of the invention, which has led to a truly stable and adequately load-bearing design of this cardboard piston, is a solid piston flange. This ensures that the inherent rigidity of the piston, combined with the low piston sleeve height as previously described, is sufficient to apply the pressure required on the tubular bag when used in a cartridge gun. What is important here is that the stiffening achieved by this flange enables the contact pressure of the sleeve- or cup-like piston sleeve, which is aligned with the head of the cartridge, against the inner wall of the cardboard sleeve forming the cartridge.

[0031] In terms of manufacturing technology, the integrated design of the flanged cardboard piston also ensures that a high level of stability is achieved, with the cup-like piston sleeve emerging directly from the flange and the flange being created directly from the entire sleeve forming the cardboard piston. This also increases the pressure of the piston sleeve section above the flange against the inner wall of the cardboard cartridge, as the flange causes a slight widening towards the upper end of the piston sleeve section, where the tight fit for guiding the tubular bag film in the transition to the displacement area on the inner wall of the cardboard cartridge takes place.

[0032] On the one hand, it is provided that this cardboard piston is ring-shaped, with the piston flange already acting as a support ring on the push rod of a cartridge gun and the film tube being guided here. A further improvement can be achieved by having a rigid cardboard piston base plate underneath the piston and this equally stable cardboard disc in turn acting as a pressure plate on the cardboard piston and thus serving as a support for the push rod of a cartridge gun. In this way, the stable guidance of the cardboard sleeve of the cardboard piston in the cardboard sleeve is additionally improved and the underside of the cartridge is also closed, which is particularly advantageous during storage and transport of the cartridge according to the invention.

[0033] This cardboard disc can either be a loose body attached to the underside of the cardboard piston or it can be firmly connected to the cardboard piston, for example by being glued.

[0034] It has also proven advantageous to have a retaining ring, e.g., a glue ring, on the lower inner wall of the cardboard sleeve, which secures the cardboard piston or the cardboard piston with the cardboard disc attached to it. This is also particularly relevant for the storage and transport of the prepared cardboard cartridge.

[0035] The glue ring prevents the cardboard disc and / or the cardboard piston from being pushed out by the weight of the tubular bags in the cardboard cartridge. Thus, movement into the cardboard sleeve is only possible by applying appropriate pressure to the piston to move it toward the cartridge's outlet.

[0036] This also has advantages in cartridge production, since the internal arrangement of the retaining ring at one of the openings in the cardboard sleeve prevents the cardboard piston, possibly with the cardboard disc resting against it, from escaping. This makes it possible to insert the cardboard piston, possibly with the cardboard disc resting against it, from the second opening in the cardboard sleeve up to a lower stop point determined by the retaining ring. This allows for automation of this production step.

[0037] In the following, the invention will be explained in more detail with reference to drawings.

[0038] Figure 1 the cardboard sleeve with inserted cardboard piston;

[0039] Figure 2 shows a section through Figure 1;

[0040] Figure 3 is an exploded view of the cardboard cartridge in perspective;

[0041] Figure 4 shows an exploded view of the cardboard cartridge in side view and

[0042] Figure 5 shows a section through Figure 4 .

[0043] Figures 1 and 2 show the cardboard sleeve 1 forming the cardboard cartridge with the cardboard piston 2 guided therein and the cardboard disc 3 lying against the cardboard piston 2 below it. It can be seen that this combination of cardboard piston 2 and cardboard disc 4 is arranged at the lower left end of the outlet opening of the cardboard sleeve 1 in the illustration, whereby an embodiment is shown in which a securing ring 4 is additionally provided below the cardboard disc 3, for example designed as a glue ring, which serves to secure the cardboard disc 3 and the cardboard piston 2 in this area.

[0044] It is also clear here that the cardboard piston 2 has a solid flange aligned towards the cardboard disc, whereby the cardboard piston is composed of this annular flange 6, which encloses a central free space towards the cardboard disc and the cup-like cardboard piston sleeve 7 as a further development of the flange aligned towards the open outlet side of the cardboard sleeve 1 forming the cartridge, which serves to guide a tubular bag, which is not shown in more detail in this figure. It is thus clear that the cup-like sleeve 7 of the cardboard piston, which is aligned towards the head of the cartridge, serves to guide a film tube in the cartridge arrangement, the underside is closed off by the cardboard disc, which therefore serves as a contact surface for the pressure of the push piston of a cartridge gun.

[0045] Also shown here is the winding gap 5 for producing the cardboard core 1, which in this embodiment of the cardboard core 1 according to the invention is particularly thin. The inner layer of the cardboard winding of this cardboard core 1 is oriented with the sharp cut edge facing inward, with the winding gap 5 of this cardboard winding being designed to be less than 0.3 mm, thus as small as possible.

[0046] This is intended to prevent a gap between the outer edge of the cardboard piston and the inner surface of the cardboard sleeve 1 from causing the tubular bag film to insert itself into this winding gap 5 of the cardboard winding and thus slip into the piston gap. This means that the narrowest possible design of the winding gap 5 of the cardboard winding is also relevant to the invention in order to be able to reliably prevent the film from penetrating between the cardboard piston 2 and the cardboard sleeve 1.

[0047] The further Figures 3 to 5 show exploded views of the interaction of the structural elements of the cardboard sleeve 1, the cardboard piston 2, the cardboard disc 3, and the retaining ring 4. Figure 3 shows a perspective view, Figure 4 a side view, and Figure 5 a section through Figure 4.

[0048] It is evident how these structural components interact in a specific order. It can be seen that the retaining ring 4 is arranged below the cardboard disc 3 and the cardboard piston 2, since the purpose of the retaining ring 4 is to prevent these structural elements of the cardboard piston 2 and the parking disc 3 from accidentally falling out of the cardboard sleeve 1.

[0049] 2 and 3, it is clear that this is a very stable and load-bearing stiffening provided by this flange 6 of the cardboard piston 2. With a radius of the cardboard piston 2 of approximately 2.2 cm, a diameter of the flange of approximately 3 to 5 mm is provided, whereby the flange has approximately 3 to 5 times the thickness of the actual cardboard piston sleeve 7 of the cardboard piston 2. Viewed over the area of ​​the cardboard piston 2 as a whole, the diameter of the flange 6 has a value of approximately 15% to 30% based on the radius of the cardboard piston 2. In this way, the desired structural integrity of the cardboard piston 2 and the contact pressure against the inner wall of the cardboard sleeve 1 can be achieved.

[0050] Figure 5 also shows the circumferential winding gap 5, which is arranged continuously in the inner wall of the cardboard tube 1. It is important to note that this winding gap 5 is designed to be a maximum of 0.3 mm thick to prevent the tubular film from being forced into this recess.

[0051] Figure 5 also clearly shows that the flange 6 in the inner circumference of the cardboard piston 2 reduces or narrows the interior of the cardboard piston 2, which also means that this narrowed space can be squeezed out as additional material. This further increases the compression of the tubular bag.

[0052] In this way, the entire compression process of the tubular bag within the cartridge cylinder is achieved more evenly, and the entry of the emptied tubular bag into the previously described annular gap between the cartridge cylinder and the cartridge base is prevented. According to the invention, the building material is arranged in a movable tubular bag within the cartridge.This results in four basic components of the cartridge according to the invention, namely the tubular bag in which the building material to be processed, for example a silicone or sealing compound, is contained, a cartridge cylinder which encloses this tubular bag as closely as possible, the cartridge base which can be moved in the cartridge cylinder and acts as a sealing, movable piston element, and the cartridge head which is attached to the front and has an outlet nozzle and outlet opening and which generally has an attached thread for attaching a nozzle. These four elements are designed to be separable from one another, since the tubular bag is inserted loosely into the cartridge cylinder in order to then close the front and back of this cartridge cylinder with the cartridge base on the one hand and the cartridge head on the other.

[0053] In this way, a cartridge is formed which, in its external appearance, resembles a conventional disposable cartridge, since it has a closed, stable base body in a cylindrical design, which makes it possible to insert this cartridge, for example, into a conventional cartridge gun.

[0054] A key aspect of the present invention is that, on the one hand, it is an environmentally friendly product because it can be recycled separately, while at the same time retaining the advantageous aspects of the disposable cartridges currently in use with regard to trade and handling. This product can therefore be stored, transported, and used like a disposable cartridge; presentation at the point of sale, for example, in a hardware store, as well as product design, the application of product information, and advertising material to the packaging are all possible in the same way as for a disposable cartridge.

[0055] Nevertheless, the modular design of the product allows these individual modules to be separated, thus offering significant advantages over conventional disposable cartridges and also over the use of material hoses in correspondingly elaborately produced application guns.

[0056] The use of the cartridge according to the invention will be explained by way of example. The cartridge according to the invention can be purchased in the usual way, for example, at a hardware store. The tubular bag containing a building material, such as a sealing compound, is located in the cartridge cylinder. The container is sealed by the cartridge base inserted at the end and the cartridge head attached to the front.

[0057] It is important, however, that these elements are not firmly connected to the cartridge cylinder as the base body or, in the case of the cartridge head, are not an integral part. This is a natural consequence of the cartridge base in its function as a push piston, since this must be moved longitudinally into the cartridge in order to press the mass out of the tubular bag. The cartridge head, however, is also only detachably attached and can be removed from the cartridge cylinder as the base body of the cartridge at any time, so that access to the tubular bag is retained as a key feature of the invention.

[0058] When inserting the cartridge according to the invention into a cartridge press or cartridge gun, a push rod with a pressure plunger is pressed against the cartridge base, which serves as a piston. Thus, the piston-like cartridge base is displaced into the interior of the cartridge and, in the case of the invention, pressed onto the tubular bag. The tubular bag is thus pushed and pressed against the cartridge head, with the cartridge head being supported by a holder that is an integral part of the cartridge gun.

[0059] Thus, the cartridge according to the invention is clamped between this receptacle for the cartridge head and the pressure stamp for engaging the interior of the cartridge cylinder. In this way, the tubular bag is pressed into the cartridge head, and at the same time, the removable cartridge head is pressed against the cartridge cylinder when the building compound is extruded from an outlet opening in the cartridge head. In this way, it is advantageously achieved that, while fully functional, the cartridge head, as a detachable component, is not firmly connected to the cartridge cylinder and can be removed from the cartridge cylinder.

[0060] This eliminates the problem of having to dispose of half-empty disposable cartridges along with the remaining building material. This cartridge thus solves the problem in an inventive way by ensuring that the material in the tubular bag, for example, a sealing silicone, is actually completely used up and that the cured building material can be disposed of separately.

[0061] Once the building compound has been used up and the pressure plunger rod has been fully inserted into the cartridge cylinder, the pressure plunger is retracted, allowing the empty cartridge to be removed from the cartridge gun and disassembled into individual modules. The cartridge head is removed, and any remaining cured building compound is removed from the cartridge head along with the attached compressed tubular bag. This tubular bag, along with the remaining cured building compound in the cartridge head, can be disposed of separately or with the cartridge head.

Claims

Claims 1. Cartridge for receiving and processing building materials comprising a cartridge cylinder, a cartridge head detachably attached to the front of the cartridge cylinder, a tubular bag containing building material and a displaceable piston-like cartridge base, wherein the cartridge cylinder is designed as a cardboard sleeve (1) and the cartridge base as a cardboard piston (2), characterized in that - the cardboard piston (2) forming the cartridge base is ring-shaped and consists of a cardboard piston sleeve (7) which is designed to be displaceable in a circumferentially close manner to the inner wall of the cardboard sleeve (1) forming the cartridge cylinder and - a flange (6) on the underside, which is formed integrally from the cardboard piston sleeve (7) itself by flanging.

2. Cartridge for receiving and processing building materials according to claim 1, characterized in that in relation to the radius of the cardboard piston (2), the diameter of the flange (6) has a value of approximately 15% to 30% of the radius of the cardboard piston (2).

3. Cartridge for receiving and processing building materials according to claim 1 or 2, characterized in that - a cardboard disc (3) is arranged on the cardboard piston (2), which rests on the ring body of the cardboard piston (2) at the flange (6) and - a supporting disc between the cardboard piston (2) and the push rod of a cartridge gun and - forms a common closed space with the cardboard piston sleeve (7) and the flange (6) for the push stamp of a cartridge gun for guiding the film tubular bag.

4. Cartridge for receiving and processing building materials according to one of claims 1 to 3, characterized in that a locking ring (4) is arranged on the inner wall of the cardboard sleeve (1) forming the cartridge cylinder at one of the open cardboard sleeve openings in such a way that the cardboard piston (2) or the cardboard disc (3) resting against it are secured against falling out of the cardboard sleeve (1).

5. Cartridge for receiving and processing building materials according to one of claims 1 to 4, characterized in that the cardboard sleeve (1) forming the cartridge cylinder has a winding gap of less than 0.3 mm.

6. Cartridge for receiving and processing building materials according to one of claims 3 to 5, characterized in that the cardboard piston (2) and the cardboard disc (3) are designed to be merely adjacent to one another or to be firmly connected to one another.

7. Cartridge (1) according to one of the preceding claims, characterized in that - the tubular bag has an upper tubular bag end and a lower tubular bag end, - wherein the cardboard piston (2) forming the cartridge base rests against the lower end of the tubular bag, displacing the tubular bag in the longitudinal direction of the cardboard sleeve (1) forming the cartridge cylinder towards the cartridge head, - and the upper end of the tubular bag engages the cartridge head.

8. Cartridge (1) according to one of the preceding claims, characterized in that the cardboard sleeve (1) forming the cartridge cylinder, the cartridge head, the displaceable cardboard piston (2) as the cartridge base and the tubular bag are detachably connected to one another and designed to be separable.

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