EP0824484B1 - Cartridge for fluid products - Google Patents

Abstract

The object of the invention is a cartridge (1) which is economical to manufacture and, also, to fill, only has a small amount of plastic and, when disposed of, causes a low level of pollution. In addition, it should be possible to use said cartridge in as many ways as possible, to empty out residues therein as far as possible, and to provide a great transportation volume. To this end, a cartridge (1) for flowable media is provided which has a volume-limiting envelope (2) made of flexible material. Said cartridge is provided at one end with a plunger-shaped press-out member (4) and at a second end with an outlet member (3). There is in the region of the outlet a dispensing opening the diameter of which, taking into account the forces which can be applied by the press-out member, the viscosity of the flowable medium and the flexibility of the envelope, ensures in the volume limited by the envelope an internal pressure which is suitable to counteract folding of the envelope material into the volume.

Description

The invention relates to a cartridge for flowable media, with a volume delimiting sleeve made of flexible material, which at one end with a piston-like extrusion element and at another end with a Exhaust element is visible.

Cartridges for flowable media are known per se. It is about Containers for storage, transportation and dispensing of flowable media. In primarily it is pasty media such as silicone rubber and the like, which is used, for example, in the construction industry Find. But it is also known to contain adhesives, greases or other media Fill cartridges.

Different types of cartridges are known. In one case it is in the case of the volume-limiting envelope by an inherently rigid, housing-like element, which is usually at one end Squeezing area and at the other end an opening for a piston-like Has squeezing element. The output area usually includes one Dispensing opening, wherein it is known that this with the case by a this one-piece element is closed. If necessary, this will be Closure, for example, opened by cutting, so that there is a Output opening offers. In this area of the dispensing opening, one with a Internally or externally threaded connecting piece can be formed, on which one Dispensing nozzle can be placed. Such cartridges are primarily made of Plastic formed so that with regard to manufacture and disposal great effort must be driven. The containers are first and foremost Disposable containers since they are not completely emptied and they are not universally applicable. Since you always have the cheapest plastic possible Cartridge manufacture chooses, these are not universal for all fabrics usable, but it must be different for different media Cartridges are made. Another problem is the lack Residual emptying of the cartridges, which is very unsatisfactory. It can also be easy contamination of operators with the medium. Finally the cartridges manufactured as empty containers are already on the way for filling as large as after filling, so need a large one Transport volume.

Rigid, tube-like cartridges with one end formed Squeezing area and a piston-like formed at the other end Squeezing element are squeezed with squeezing devices in which the clamped tubular element and the squeezing element by means of a Pressure piston is advanced.

It is known to use the media to be processed as an alternative to the to provide cylindrical containers in tubular bags. such Tubular bags essentially consist of a tubular film which is attached to is closed at both ends. It is known to use ends to close so-called metal clips. By using such Tubular bags should primarily be avoided that a large number of emptied cylindrical containers must be disposed of. The production of Tubular bags are easier and disposal is also easier. Since the However, tubular bags are not dimensionally stable, they are used to process the media located in a dimensionally stable cylindrical shell one end of a closure with a dispensing opening, for example for Arrangement of a nozzle tip is arranged. From the other end of the cylindrical outer shell forth then pressure can be exerted on the tubular bag exercise. In order to dispense the mass in the tubular bag, it must be can be opened, which in practice by the destruction of the tubular pouch by slitting, piercing or the like. After emptying the tubular bags are removed from the cylindrical envelopes again, so that only a small, largely empty tubular bag has to be disposed of. Although this has advantages over the cylindrical plastic cartridges has, the tubular bags have the disadvantage of only up to certain Wash volume to be manageable and in a particularly disadvantageous way Contaminate dispensers with the filled media. Most of time the operators will also come into contact with the medium. this leads to often to a complete blockage of the dispensing means, so that these in the Practice must at least partially be disposed of. This eliminates the Planned benefits and environmental pollution from the disposal of Tubular bags on the one hand and dispensing devices on the other hand considerably increased. The disadvantages are caused by the contamination of the Operators, at the latest when the tubular bag is removed from the Dispensers, reinforced.

Tubular bags are not dimensionally stable, so they can be processed in them media are inserted into a dimensionally stable cylindrical shell one end of a closure with a dispensing opening, for example for Arrangement of a nozzle tip is arranged. From the other end of the cylindrical outer shell forth then pressure can be exerted on the tubular bag exercise.

All previously known cartridges of the type mentioned are thus the Common disposal problems that lead to high disposal costs. In addition, the previously known cartridges cannot be used universally, inflexible in terms of volumes and have drawbacks primarily due to the uncontrollable usability.

Based on this prior art, the present invention has for its object to provide a cartridge that is economical to manufacture and fill up, has only a little plastic and brings little pollution from disposal. In addition, the most universal usability, the greatest possible residual emptying and a low transport volume should be guaranteed.

To solve this problem technically, a cartridge for flowable media is provided, with a volume-limiting sleeve made of flexible material, which can be provided at one end with a piston-like extrusion element and at the other end with an outlet element, an outlet opening being provided in the region of the outlet is the diameter of which, taking into account the forces which can be applied by the extrusion element, the viscosity of the flowable medium and the flexibility of the casing, ensures the maintenance of an internal pressure in the volume limited by the casing, which is suitable for counteracting the folding of the casing material into the interior of the volume.

The invention provides a cartridge in which a number of Elements are coordinated with each other in a defined way to create a concrete one to achieve a verifiable result. This essentially turns out to be the usual piston geometry of the piston-shaped extrusion element Extraction forces and the diameter of the dispensing opening on top of each other Voted. With additional consideration of the viscosity of the flowable Medium and the flexibility of the shell is at least a minimum internal pressure in the limited volume maintained by the envelope, so that the Envelope material cannot fold into the interior of the volume. With folding in mind the present invention is to be understood that the flexible material is not in the area in which it is still filled with the filled medium Folds may tend, especially not to folds that are transverse to Squeeze direction. Such folds would one Compress the flexible sleeve in the area between the squeezing piston and Dispensing opening accordingly, so that a perfect scraping and how will be described later, a perfect inversion, no more are guaranteed. The teaching of the invention makes it very special advantageously achieved a number of technical features. For one, concerns this refers to the complete scraping out of the casing body which has already been mentioned its inner surface. Depending on the outer circumference of the Piston element results in a scraping cross-section defined in this way, which at least not changed or hindered by additional foldings of the cover material shall be. Another technical feature is the reversibility of the scraped out material. It goes without saying that technical teaching is not simply reducible to the smallest possible dispensing opening is chosen, as this means the intended technical usability the cartridge is damaged. Rather, the dispensing opening fulfills that Requirement of a given from processing boundary conditions Material flow, but in cooperation with the other parameters is sufficient the requirement to maintain a minimum pressure. It's also about defined and reproducible conditions, not about random results, e.g. due to the cutting of a nozzle or the like.

Due to the configuration according to the invention, a shell can now be made from a non-rigid film is produced and in a defined manner in the Processing of the filled medium can be used. The shell is during the processing and in the processing breaks by the inside prevailing pressure stable and thus favors a simple and proper handling. Due to the good scratchability, the Reduce residual emptying considerably. Even envelopes with very large Filling volumes are used because they are due to the defined internal pressure still have manageable stability. The shell can be under Use very little plastic and thus contributes to Energy saving in manufacturing and especially to reduce the Disposal costs at.

It is proposed with particular advantage that the shell consists of at least one Foil is formed. This is advantageously a plastic film. It can one can also find inexpensive plastics such as polyethylene (PE) or high-pressure polyethylene (HDPE) which are very inexpensive materials. The sheath advantageously comprises at least one of the diffusion density Layer, preferably aluminum is proposed. The shell can be in Dependence on the dimensioning by additional tissue, for example Nylon and the like can be stabilized. Advantageously, the envelope formed tubular with an essentially round cross section.

The outlet element is in accordance with an advantageous proposal of the invention disc-shaped or pot-shaped element, which is particularly advantageous Way at one end of the cover is connected to this closing. The Envelope is thus advantageously produced as a film tube that is attached to one End with the entire circumference of the cup-shaped outlet element connected is. The cup-shaped outlet element is advantageously made of plastic and can diffusion stabilize according to a further advantageous proposal be coated, for example with aluminum foil. To make the Connection, the outlet element can have grooves into which a Clamping element is clipped in, the film forming the envelope is stuck in between. The clamping element is advantageous disk-shaped.

It is particularly advantageously proposed that the outlet element be cup-shaped is designed and has the grooves on the cylindrical inner wall of the pot. The outlet element is facing the bottom of the pot into the inside of the envelope Shell inserted. The edge of the casing is then turned over the edge of the pot. An annular or disc-shaped clamping element is then placed in the pot clipped in and comes into contact with the grooves. It will intermediate sleeve material clamped in place. Through this Design, the tensile forces acting through the shell material are multiple redirected and reduced.

The outlet element advantageously has an opening nozzle forms a dispensing opening. The opening socket can be inside or inside The outside may be provided with a thread, preferably a trapezoidal thread. A filling device or a dispensing nozzle can be attached to the trapezoidal thread connect. The trapezoidal thread has the particular advantage that it absorbs acting pressure forces well.

The opening socket can be screwed into the thread Closure cover can be closed. The cover can be advantageous Have a handle for handling and also in advantageously a hole, for example to hang the cartridge can. The sealing cover can be interposed with a film element, preferably a diffusion-stable film element can be used.

Due to the described configuration according to the invention, the State of the art completely new way provided a cartridge that is resealable despite economical manufacture. Through the liner a piece of film, for example an aluminum cap, the can be plastic-coated, the volume can be diffusion stable close. This means that once opened, the volume can be used later Reseal the use of the filled medium.

The nozzle element that can be attached to the opening nozzle has a threaded area and a nozzle area.

The piston-shaped extrusion element is according to a particularly advantageous Proposal of the invention a cup-shaped piston. This preferably from Plastic-made element can be according to a particularly advantageous Proposal of the invention closes the envelope at one of its ends with this be connected. The pot-shaped element is then placed in the bottom of the pot Shell inside facing inserted into the shell and on the circumferential area with the Cover material connected to the cover. The contour of the bottom of the pot corresponds the negative shape of the bottom of an outlet element, whereby the degree of Residual emptying increased considerably. In a particularly advantageous manner, the Piston on the circumference of a scraper edge to scrape out the inside of the casing, when the piston is pushed through the sleeve.

To fasten the piston with the sleeve material, the Formation of a Einclipsnut and the use of a clamping element proposed so that even in the area of the squeezing element connection type described for the outlet element is possible. Both the piston as well as the outlet element can also in other ways with the Casing material to be connected, gluing, welding, etc.

According to an advantageous proposal of the invention, the piston can also be used Reinforcing ribs be provided.

Due to the described configuration according to the invention, a Cartridge in simple form through the use of a film tube produce that at one end by clip connection with an outlet element and at the other end by clip connection with a piston element is closed. This configuration according to the invention ensures under Use of simple and economically producible elements also one easy use and economical disposal because of the materials can be used from the point of view of disposal. A special advantage results characterized in that the piston through the volume interior to the outlet element can be performed, the flexible sleeve material in the area of Inside edge of the piston. So does the piston with its piston surface When the bottom of the outlet element is reached, the sleeve is half its length shortened drawn in itself. This particularly advantageous aspect of Invention has a number of advantages. After making one cartridge according to the invention can be created by simple vacuum generation Piston sucked through the volume inside up to the outlet element or can be pushed in by pushing in. The empty state too transporting sleeve is now only half as long as a plastic cartridge same filling volume. As a result, the transportation costs become significant, namely can be reduced by at least 50%. Due to the flexibility of the shell can by appropriate packing process a further reduction. When filling can be in its original position by low pressure generation of the piston push back and the case can be filled completely. This is an advantage nor that practically no air inside the casing at the beginning of the filling process is available. The piston is then used as intended by a suitable squeezing device in the direction of the outlet element moves, due to the selected dimensions of the piston surface under Consideration of media viscosity and envelope flexibility and the Dimensioning of those formed in the area of the outlet element There is always sufficient internal pressure inside the casing inside the outlet opening the cover presses outward stabilizing and avoids folding. So can the envelope can be almost completely scraped out by the pistons passing by and, what is particularly important, the envelope is not between the piston and Exhaust element pressed together but turned inside out cleanly behind the piston and tracked, since the casing end is attached to the piston. With complete Emptying the piston has reached the outlet element. The residual drain is accordingly good and exceeds the legal requirements in every respect.

The completely empty cartridge cannot contaminate the operator lead more and can be done with a considerable reduction in disposal costs simply dispose of. The plastic part is compared to conventional cartridges significantly reduced, e.g. 70%.

If the intended use of the cartridge is interrupted, before it is completely empty, the cartridge can be closed close again. It is possible to have a Use a cover plate or a cover cap. That in the cartridge the remaining reservoir can thus be stored again.

If a cartridge is filled as described above, the end of the process the filling process also the cap with the interposition of a Cap inserted. This cap in the form of a preferably thermoformed foil cone also represents a tamper-evident seal and must first be destroyed before the medium is issued.

The contour of the lid base is particularly advantageous designed that on the one hand, together with the filled internal volume defined filling quantity and, on the other hand, a defined internal pressure can guarantee. For this purpose, the closure cover can, for example, with Be defined bore, in which one as part of the filling remaining medium mountain is recorded in a defined manner.

It is proposed with particular advantage that the internal pressure Output opening is formed in the region of the opening on the connection element side. The connector has, as described, an opening, in the An outlet opening is formed inside. In the area of this nozzle a Opening defined diameter can be formed, the inventive represents pressure-effective discharge opening.

Alternatively, it is proposed in a particularly advantageous manner that the pressure-effective dispensing opening in the threaded area of the nozzle element is trained. Nozzle elements are in a manner known per se via a predetermined length with a tapering cross-section. The User can then do anything technically required at will Cut off the nozzle diameter. This area is opposite but not pressure effective in the sense of the present invention, but the pressure effective discharge opening is in the lower and not cut Area of the nozzle element, preferably formed in the threaded area.

Of course, it is within the scope of the invention, the pressure effective Dispensing opening in a combined manner on the outlet element side and to be formed on the nozzle element side.

With particular advantage, the invention also proposes that the outlet element-side outlet opening at the end pointing to the volume in the form of a ring is rejuvenated. Through this annular taper of the outlet opening is a Formed sealing lip or sealing surface, on which, for example, a nozzle element can be screwed on as well as a cover. In addition, in simply insert a film that is described as Tamper-evident and diffusion-proof closure is effective.

Finally, the invention proposes that the already emptied and part of the casing located behind the piston element continues in the axial direction is compressible. By this measure, for example by a corresponding configuration of an extrusion device can be realized, that will Final volume of the emptied envelope to a fraction of its original length reduced, which further favors the disposal.

With the present invention a completely new cartridge class provided, which is characterized by an economic manufacturability, a economical empty transport and easy filling. The Cartridge according to the invention can, since essentially sheet-like materials be used for almost universal use, for example by using polyethylene-coated aluminum foil. The Total weight can be compared to conventional plastic cartridges unfilled state can be reduced to a good third. The Transport cost savings of the empty cartridges are therefore immense. After filling, the cartridges can be used even in large filling volumes handle, because pressure filling is easily possible. By the defined cooperative design taking into account different First and foremost, the parameter is a reproducible behavior of the Cartridge ensures when it is emptied, so that in a defined manner Degrees of emptying and final defined and reproducible Disposal sizes result. By turning the envelope inside out as a result of the maintaining the minimum internal pressure, the shell is carefully scraped out and reduced to at least half of their length by everting. Another one Pressing favors disposal. In a particularly advantageous manner the type of cartridge according to the invention after filling also if necessary a diffusion-proof tamper evident and advantageous resealable.

Figur 1

eine schematische teilgeschnittene Darstellung einer Hälfte eines Ausführungsbeispiels für eine Kartusche;

Figur 2

eine Darstellung gemäß Figur 1 in einem anderen Betriebszustand;

Figur 3

eine Darstellung gemäß Figur 1 in einem anderen Betriebszustand;

Figur 4

eine Draufsicht auf ein Deckelelement;

Figur 5

eine Schnittansicht des Deckelelementes gemäß Figur 4;

Figur 6

eine Ansicht des Deckelelements gemäß Figur 4 von unten;

Figur 7

eine Detailansicht des Details VII gemäß Figur 5;

Figur 8

eine Draufsicht auf eine Klemmscheibe;

Figur 9

eine Schnittdarstellung der Klemmscheibe gemäß Figur 8;

Figur 10

eine Draufsicht auf ein Kolbenelement;

Figur 11

eine Schnittdarstellung des Kolbenelementes gemäß Figur 10;

Figur 12

eine Ansicht des Kolbenelements gemäß Figur 10 von unten;

Figur 13

eine Draufsicht auf einen Klemmring;

Figur 14

eine Schnittansicht des Klemmrings gemäß Figur 13;

Figur 15

eine Ansicht einer Düsenspitze;

Figur 16

eine Schnittansicht der Düsenspitze gemäß Figur 15;

Figur 17

eine Seitenansicht eines Verschlußelementes;

Figur 18

eine Draufsicht auf das Verschlußelement gemäß Figur 17;

Figur 19

eine Schnittansicht des Verschlußelementes gemäß Figur 17 und

Figur 20

eine schematische Schnittansicht eines Ausführungsbeispiels für den Kolben eines Auspreßwerkzeugs.

Further advantages and features of the invention result from the following description with reference to the figures. Show:

Figure 1

a schematic partially sectioned representation of one half of an embodiment for a cartridge;

Figure 2

a representation of Figure 1 in another operating state;

Figure 3

a representation of Figure 1 in another operating state;

Figure 4

a plan view of a cover element;

Figure 5

a sectional view of the cover element according to Figure 4;

Figure 6

a view of the cover element according to Figure 4 from below;

Figure 7

a detailed view of detail VII of Figure 5;

Figure 8

a plan view of a clamping disc;

Figure 9

a sectional view of the clamping plate according to Figure 8;

Figure 10

a plan view of a piston element;

Figure 11

a sectional view of the piston element according to Figure 10;

Figure 12

a view of the piston element according to Figure 10 from below;

Figure 13

a plan view of a clamping ring;

Figure 14

a sectional view of the clamping ring according to Figure 13;

Figure 15

a view of a nozzle tip;

Figure 16

a sectional view of the nozzle tip according to Figure 15;

Figure 17

a side view of a closure element;

Figure 18

a plan view of the closure element according to Figure 17;

Figure 19

a sectional view of the closure element according to Figure 17 and

Figure 20

is a schematic sectional view of an embodiment for the piston of an extrusion tool.

The embodiments described in the figures for a cartridge and Individual parts thereof serve to explain the invention. The in Figures 1 to 3 shown cartridge 1 comprises a volume-limiting shell 2, which in shown embodiment is shown as a cylindrical shell. The shell is for example a composite film made of PE, AL as a barrier layer in the sense of a diffusion-proof layer that is resistant to steam, gas, UV radiation and the same is resistant, and a bond stabilization by BO-NY (biaxial oriented nylon). A cylindrical tube is formed through the film, which is closed at one end by a lid 3 and at the other End by a piston 4. Both with the cover 3 and with the piston 4 the film 2 is firmly connected. The cover 3 has an opening neck 5. In the embodiment of Figure 1 is in the opening neck, which one Has internal thread, a nozzle tip 6 screwed. In which The exemplary embodiment according to FIG. 2 is a instead of the nozzle tip 6 Cap 7 screwed into the opening 5. In the case of FIG shown embodiment, the cartridge 1 is in a state in which the piston 4 inside through the shell 2 to the cover 3rd is advanced. This is either the transport position in which the Cartridge is only half the normal length, or it is the position after full squeezing. FIG. 3 also shows that the contour the piston surface is essentially congruent with the contour of the lid base, which enables almost complete emptying. The shell 2 is everted behind the piston 4. In this position there is a slight and small transport unit for filling. After emptying, the result is simple small unit to be disposed of, the inverted cover 2 according to FIG. 3 can be compressed even further by appropriate devices.

With reference to the other figures, the individual construction elements the cartridge described.

Figures 4 to 9 show an embodiment of a lid. In Figure 4 is a Cover element 8 shown in plan view, which the centrally arranged Opening nozzle 5 includes. The sectional view of Figure 5 shows that Lid element is essentially pot-shaped or pan-shaped and one Has edge 9. The bottom 10 has a contour that a residual emptying and air-free filling favors. Inside the opening 5 is a Trapezoidal thread 11 is formed. The trapezoidal thread is used to attach one Nozzle or a sealing cap. The formation of the thread 11 as Trapezoidal thread favors the absorption of tensile and compressive forces when filling as well as when squeezing. An annular groove 12 is formed in the interior of the edge 9. As the detailed illustration according to FIG. 7 shows, is in the area of the transition from Bottom 10 in the opening neck 5, the opening tapers annularly. This Taper ring 41 performs a number of functions. For one thing is his thread-side configuration designed so that there is a sealing surface, the the seal against a nozzle or a cap favors.

The annular groove 12 described is used to insert a clamping disk 13 which, as shown in Figure 9, an annular web 14 with an outwardly facing Has cam ring. The cover element 8 is in this way in a tubular casing used that the bottom 10 faces the volume surrounded by the envelope. The edges of the film tube protrude beyond the edge 9 of the cover element 8 and are handled in the direction of the opening 5. Then the Push the clamping disk 13 over the opening neck 5 until the cam ring 15 locked in the annular groove 12 and the tubular film material over the entire ring circumference is clamped. Thus a diffusion and creates a pressure-tight connection between the film tube and the cover.

An exemplary embodiment for a piston is shown in FIGS. 10 to 14. The Piston consists of a piston head 16, which has a piston surface 17 with a has a curved contour 18 which merges into a piston rim 19. The transition is exceptionally angular and the piston rim 19 can even from the Piston surface starting from a conical taper. It follows a sharp-edged corner that encourages scraping the inside of the film. in the Inside of the piston rim 19 and the rear of the piston surface 17th formed pot an annular groove 20 is formed. A clamping ring can be placed in this 22 insert, which is shown in Figures 13 and 14 and in the area of a Ring web 23 has an annular bead 24 which can be locked in the annular groove 20. Here, too, the end of the film tube can be inserted, so that the Piston surface 17 in the volume interior and the piston edges Overlap piston rim 19. When the clamping ring 13 is inserted Locking the annular bead 24 in the annular groove 20 clamped the film edge material and there is a tight and tight connection here. The piston pot 16 is like is shown in the bottom view according to FIG. 12, stiffened by reinforcing ribs, the relative in the embodiment shown at an angle of 45 ° are arranged to each other.

The described embodiment shows that without additional elements simple clipping or latching one as shown in Figures 1 to 3 Cartridge can be produced with simple means. All the elements described can be diffusion-proof coated or designed. Usually are the described cover and piston elements are made of HDPE. This is physiologically harmless and very inexpensive. Of course, these elements against diffusion, for example by aluminum coating protect or lamination. The casing material can also be made accordingly be folded over and fastened.

It turns out that by combining functional bodies with Clamping elements a multi-stage clamping can take place, so that For example, the film in the area of the cover element in several places in Transitions is clamped, which increases strength and tightness. Through the multiple deflection of the film as part of its attachment to the described cover and / or piston elements are also those that occur Forces redirected and diverted.

FIGS. 15 and 16 show an embodiment for a nozzle 6, which has a threaded area 25 and a nozzle area 26. The Nozzle area 26 has a nozzle tip 27 and also a number of marked passages 28 in which the nozzle to achieve a defined Passage opening can be cut with a predetermined diameter. Usually there are passage openings of 3 mm in the tip and then Gradations of 2 mm from passage opening jump to Durchlaßöffnungssprung. In the area of the lower edge of the nozzle there is a ring Outlet opening 30 is formed. In Figure 1, the mounting position of the nozzle 6 is on the cartridge 1 shown, which shows that the nozzle tip with its lowest Edge of the thread area, which is chamfered, sealingly on the Taper ring 41 rests in the opening nozzle 5. It also rejuvenates an outlet opening with a defined diameter on the inside. This contour in Thread area in the transition to the nozzle defines the outlet opening in the Interaction with the piston surface, the material viscosity and the Envelope flexibility maintaining a minimum internal pressure in the cartridge guaranteed, regardless of the others by cutting the nozzles diameters obtained.

FIGS. 17 to 19 show an exemplary embodiment of a closure cap 7 shown, which also has a threaded region 31 which is cup-shaped is closed. A handle 32 is arranged on the upper closure surface, which allows the closure cap to be actuated. In this handle 32 is in Embodiment shown a bore 33 formed, which a hanging the sealed cartridge allows. Reinforcing ribs 34 on both Sides of the handle 32 serve for stabilization. Inside the pot-like Cap 7, a bore 35 is made in a defined manner. This Bore 35 is designed so that after the finished filling in the in Figure 2 shown position a defined medium distribution and a defined internal pressure are guaranteed. A cap (not shown) can be placed in the cap Insert the foil cone or place it on it and clamp it in the thread. This hat serves as a tamper-proof, must be destroyed before use and can be designed to be diffusion-tight around the cartridge inside completely diffusion-proof.

Figure 20 shows an exemplary embodiment of a pressure piston element, as on pages an extrusion tool can be used to further advantageous To enable uses of the invention. This pressure piston 36 has one cylindrical piston portion 37, with which pressure on the bottom of the Squeeze piston 4 of a cartridge 1 is exerted. The cartridge 1 as it For example, shown in Figure 1 is advantageously in a tubular Expressing element used, which has a passage opening for the at one end Has nozzle 6 and the cover 3 offers a stop. From the other end is for example by means of a pressure piston 36 pressure on the bottom of the Piston 4 exercised. This is slowly pushed towards the lid, a minimum pressure through the defined outlet opening inside that is constantly maintained for a plump and not folded inwards Shell 2 provides. Only this configuration enables the material of the Shell 2 after the piston 4 scraping the shell inside is pushed upside down behind the piston 4, as shown in Figure 3. at Further advancing the piston 4, the everted area becomes longer and longer. With a pressure piston according to Figure 20, the everted area is now behind the piston 4 always longer and pushed back until the edge or Ring fillet 40 is reached. Here the inverted area is redirected again and slowly compressed axially. On the pressure piston 36 is on the base plate 39 continued to exert pressure. The pressure piston is guided in a tubular element wherein the guide edge 38 is guided essentially on the inner tube wall.

The inverted film area is also shown along the inner tube wall in remain inverted form and slowly through the ring throat towards of the cylindrical wall portion of the piston portion 37, where others Turnings, carding and the like take place. Such a drained and compressed cartridge can be disposed of easily and space-saving.

Cartridges of the exemplary embodiments shown can advantageously be used create in different dimensions. Filling volumes are around 600 ml very suitable, the transport unit can be shortened to 300 ml, which is about Corresponds to a length of 170 mm. A transport volume reduction of 60% compared to conventional cartridges, which have a total cartridge length of approximately 230 mm is easy to reach. It is also simultaneous the transported cartridge according to FIG. 3 is largely evacuated and can be therefore pressurize immediately. The piston is displaced axially until the Film is tightened and the respective filling volume is reached. Then one Screwed cap, with a foil cap as tamper-evident closure is also screwed in. For example, this can also be a deep-drawn one Aluminum part. All solid plastic elements are advantageous made of HDPE, optionally aluminum-coated. The end point on the nozzle creates during the squeezing process, an overpressure in the envelope, which causes the film does not sink inwards and is thereby stabilized. Due to this effect, the Excellent slide past the inside of the film and scrape it out and at the same time pull the scraped-out film behind you so that Allow residual emptying down to less than 1%. By a pressure piston The pressing tool according to FIG. 20 can be compressed to approx. 15 % of the original size.

The exemplary embodiments described serve only for explanation and are not restrictive.

LIST OF REFERENCE NUMBERS

1

cartridge

2

shell

3

cover

4

piston

5

opening socket

6

jet

7

cap

8th

cover element

9

edge

10

ground

11

thread

12

ring groove

13

clamping disc

14

ring land

15

cam ring

16

piston pot

17

piston area

18

contour

19

piston edge

20

ring groove

21

reinforcing ribs

22

clamping ring

23

ring land

24

torus

25

threaded portion

26

nozzle area

27

nozzle tip

28

passages

29

reinforcing ribs

30

outlet

31

threaded portion

32

Connecting bridge

33

drilling

35

drilling

36

pushpin

37

piston area

38

leading edge

39

baseplate

40

annular groove

41

rejuvenation

Claims (30)

1. Cartridge for flowable media, having a volume-defining casing (2) made of flexible material, which can be provided with a plunger-like ejection element (4) at one end and with an outlet element (3) at another end, a discharge opening being provided in the region of the outlet element, the diameter of which, taking into consideration the forces which can be applied by the ejection element, the viscosity of the flowable medium and the flexibility of the casing material, ensures the setting of a minimum internal pressure in the volume defined by the casing, the said minimum internal pressure being suitable for counteracting the folding of the casing material into the volume interior.
2. Cartridge according to Claim 1, characterized in that the casing is formed from at least one film web.
3. Cartridge according to Claim 2, characterized in that the film web is a plastic web.
4. Cartridge according to one of the preceding claims, characterized in that the casing has a diffusion-stable material.
5. Cartridge according to one of the preceding claims, characterized in that the casing is fabric-stabilized.
6. Cartridge according to one of the preceding claims, characterized in that the casing is of tubular design.
7. Cartridge according to one of the preceding claims, characterized in that the outlet element is disc- or cup-shaped.
8. Cartridge according to one of the preceding claims, characterized in that the casing (2) is closed at one end by the outlet element and is connected over the entire circumference fixedly to the said outlet element.
9. Cartridge according to one of the preceding claims, characterized in that the outlet element is a plastic element.
10. Cartridge according to Claim 9, characterized in that the outlet element is a diffusion-stable layer.
11. Cartridge according to Claim 8, characterized in that the connection between the outlet element and casing is undertaken by the insertion of a clamping element into grooves on the outlet element.
12. Cartridge according to Claim 11, characterized in that the clamping element is disc-shaped.
13. Cartridge according to one of the preceding claims, characterized in that the outlet element has an opening stub (5).
14. Cartridge according to Claim 13, characterized in that the opening stub has a thread.
15. Cartridge according to one of the preceding claims, characterized in that the latter can be closed by a closure cap (7).
16. Cartridge according to Claim 15, characterized in that the closure cap has a web-like actuating handle.
17. Cartridge according to one of Claims 15 or 16, characterized in that the closure cap has an internal hole.
18. Cartridge according to one of the preceding claims, characterized in that a nozzle (6) can be fastened onto the outlet element.
19. Cartridge according to one of the preceding claims, characterized in that the plunger element is of cup-shaped design.
20. Cartridge according to Claim 19, characterized in that the plunger element (4) is a plastic element.
21. Cartridge according to one of the preceding claims, characterized in that the plunger element is connected to the casing (2) closing the latter at one end.
22. Cartridge according to one of the preceding claims, characterized in that the contour of one plunger surface (17) of the plunger element (4) corresponds to the contour of a base (10) of the outlet element.
23. Cartridge according to one of the preceding claims, characterized in that the plunger element has a stripping edge on its outer circumference.
24. Cartridge according to one of the preceding claims, characterized in that the connection between the plunger element and casing is undertaken by the insertion of a clamping element into at least one annular groove.
25. Cartridge according to one of the preceding claims, characterized in that the plunger element has reinforcing ribs.
26. Cartridge according to one of the preceding claims, characterized in that the pressure-effective discharge opening is formed in the region of the opening of the outlet element.
27. Cartridge according to one of Claims 1 to 25, characterized in that the pressure-effective discharge opening is formed in the nozzle (6).
28. Cartridge according to Claim 27, characterized in that the pressure-effective opening is formed in a threaded region (25) of the nozzle (6).
29. Cartridge according to one of the preceding claims, characterized in that the opening on the outlet element is tapered annularly at its volume-side end.
30. Cartridge according to one of the preceding claims, characterized in that the latter can be compressed by an ejection device.

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