EP4108596A1 - Set of coaxial cartridges for storing and pressing a two-component mass with different mixing ratios - Google Patents

Abstract

The invention relates to a coaxial cartridge set with a plurality of coaxial cartridges (2, 20), each of which comprises the following for storing a flowable two-component mass and for placing it in a support structure (3) for pressing the mass out of the cartridge (2, 20): hollow-cylindrical inner chamber (6) for accommodating a first component of the two-component mass and a hollow-cylindrical outer chamber (7) arranged coaxially around it for accommodating a second component of the two-component mass, the inner and outer chambers (6, 7) being on a front end face (8th ) of the cartridge (2, 20) except for one discharge opening (9, 10) per chamber (6, 7) are closed; and- an inner piston (12) closing the rear of the inner chamber (6) and being movable axially therein, and an outer piston (13) closing the rear of the outer chamber (7) and being movable axially therein;- the outer chambers (7) of all cartridges (2, 20) of the set have a substantially identical geometry on the outside, so that they can be used with one and the same support structure (3), and at least two of the cartridges (2, 20) are designed for different mixing ratios of the two components, in that their inner chambers (6) are different are large in radial cross-section.

Description

FIELD OF THE INVENTION

The invention relates to a coaxial cartridge set comprising a plurality of coaxial cartridges, each of which is designed to receive and store a first and a second component of a flowable two-component mass in separate coaxial chambers and to be placed in a support structure for squeezing the mass out of the cartridge.

BACKGROUND OF THE INVENTION

Various cartridge designs are known for receiving two components of free-flowing masses in separate chambers, which can be dispensed using a dispensing device. With regard to the arrangement of the chambers, a distinction is made between coaxial cartridges and cartridges or foil packs with individual cartridges or foil bags arranged next to one another for the various components of a two-component mass. The two-component mass can be, for example, a sealing or fastening mass such as mortar, adhesive and much more.

In order to ensure a high, constant mixing quality of the two components to be dispensed, suitable support structures for the cartridges, into which the cartridges are inserted for the squeezing process, are to be used in most cases. These support structures absorb the pressure of the cartridges during the squeezing process and prevent the cartridges from expanding, which are mostly made of plastic and would therefore yield to a high pressure during the squeezing process without the support structure.

• Koaxialkartuschen zeigen beim Auspressvorgang aufgrund eines nahezu gleich hohen Druckes in beiden Kammern und eines Überdrucks gegenüber dem außerhalb der Kartusche herrschenden Atmosphärendruck ein sogenanntes Pumpverhalten auf, welches zu Mischstörungen und entsprechend zu mangelndem Aushärteverhalten der beiden Massen führen kann. Beim elastischen radialen Ausdehnen der Außenwand einer Koaxialkartusche beim Auspressvorgang entstehen darin Rückstellkräfte. Beim Unterbrechen eines Auspressvorgangs - beispielsweise beim Übergang zum nächsten Bohrloch, wenn mehrere Bohrlöcher hintereinander mit dem Inhalt einer Kartusche befüllt werden, - entlastet sich der Druck in der Außenkammer der Kartusche entweder durch das Ausfließen der darin enthaltenen Komponente durch den Kartuschenauslass oder durch eine Entlastung des in dieser Kammer angeordneten Außenkolbens. Hierbei entsteht ein Kolbenversatz gegenüber der Innenkammer, was zu entsprechenden Mischstörungen beim nachfolgenden Auspressvorgang führt.

In particular, when using foil cartridges, different support structures are required due to the varying diameters for the realization of varying mixing ratios. In the case of coaxial cartridges, the external geometry of the cartridge usually changes with varying mixing ratios and also leads to the need for different support structures:

• During the squeezing process, coaxial cartridges show a so-called pumping behavior due to an almost equally high pressure in both chambers and an overpressure compared to the atmospheric pressure outside the cartridge, which can lead to mixing problems and correspondingly to a lack of hardening behavior of the two masses. When the outer wall of a coaxial cartridge elastically expands radially during the squeezing process, restoring forces arise therein. When a squeezing process is interrupted - for example when moving to the next borehole, when several boreholes are filled in succession with the contents of a cartridge - the pressure in the outer chamber of the cartridge is relieved either by the components contained therein flowing out through the cartridge outlet or by relieving the pressure in the outer bulb arranged in this chamber. This creates a piston displacement in relation to the inner chamber, which leads to corresponding mixing problems during the subsequent squeezing process.

To remedy this, a support structure is to be used here as well, which reduces deformation of the outer wall of the cartridge during the squeezing process to a minimum. For this purpose, the support structure must be as close as possible to the against the outer wall of the cartridge and be as stable as possible in relation to the pressure differences prevailing during the squeezing process.

The object of the present invention is to provide a set of coaxial cartridges which are each designed to store a free-flowing two-component mass in different mixing ratios and to be placed in a support structure for pressing the mass out of the cartridge, as far as possible without the described disruptive pumping behavior based on restoring forces.

DISCLOSURE OF THE INVENTION

This object is achieved by a coaxial cartridge set according to claim 1 and by a corresponding system and method according to the independent claims. Further developments are specified in the dependent claims. All of the additional features and effects mentioned in the claims and the description for the individual cartridges and the cartridge set also apply accordingly to the system and the method, and vice versa.

According to a first aspect, a coaxial cartridge set is provided that includes a plurality of coaxial cartridges. Each of these coaxial cartridges is designed to receive and store a flowable two-component mass and to be placed in a support structure for extruding the mass from the cartridge and comprises a hollow cylindrical inner chamber for receiving a first component of the two-component mass and a coaxial (ie with the same cylinder axis) around it arranged hollow-cylindrical outer chamber for receiving a second component of the two-component mass. The inner chamber and the outer chamber are closed on one of the two end faces of the cartridge at which the mass is discharged from the cartridge (referred to herein as the “front end”), except for one discharge opening per chamber. Furthermore, each cartridge includes an inner piston which closes the inner chamber at the rear (ie towards the other end face of the cartridge) and can be moved axially therein, and an outer piston which closes the outer chamber at the rear and can be moved axially therein.

The two-component mass thus comprises a first component and a second component, which are stored separately from one another in the cartridge and are only mixed with one another when they are dispensed from the cartridge. This can in particular be a sealing or fastening compound such as mortar, adhesive and the like.

All cartridges in the set have an identical external geometry in the area intended for insertion into a support structure and for holding therein, which covers, for example, the entire cylindrical outer wall of the outer chamber and that part of the front face that does not cover the discharge openings or a mixer connection piece ( see. 1 ), may include. In this way, all cartridges can be used with one and the same support structure.

Two or more cartridges of the set are designed for different mixing ratios of the two components, in that their inner chambers are of different sizes in (radial) cross section. (The cross-section of coaxial cartridges is always referred to herein as the radial cross-section, i.e. a cross-section perpendicular to the cylinder axis of a cartridge.)

The outer chambers of all cartridges are of the same size on the outside and, with differently dimensioned inner chambers, have a correspondingly differently sized annular cross section. The two pistons - the inner piston and the outer piston - are dimensioned in each cartridge according to the cross-sectional dimensions of the inner and outer chambers in such a way that the piston can be axially displaced in its chamber and the mass can ideally be completely pressed out of this chamber through the discharge opening.

The mixing ratio of a coaxial cartridge can be defined here, for example, by a cross-sectional ratio of the inner and outer chambers, not counting the respective wall thicknesses.

One idea of the invention is therefore the creation of a set of coaxial cartridges, which are characterized in that with a mixing ratio that varies from cartridge to cartridge, only the diameter of the inner tube (which radially delimits the inner chamber) is varied. The outer diameter of the outer chamber - and thus of the entire cartridge - remains unchanged. This means that different support structures can be dispensed with. In other words, with one and the same support structure for all coaxial cartridges of the set, the same high quality of the squeezing process can be guaranteed, in particular without the disruptive pumping behavior of the type mentioned at the outset.

According to one embodiment, the hollow-cylindrical inner chamber of each cartridge of the set has a circular cross-section and the hollow-cylindrical outer chamber has a circular cross-section. In this embodiment, therefore, all the cartridges in the set have the same outside diameter, with those cartridges which are designed for different mixing ratios differing in the different diameters of their inner chambers. However, a circular cross-section is not absolutely necessary for the functionality described herein, so that other cross-sectional geometries, such as oval or rectangular, can also be implemented.

The coaxial cartridges of the set can in particular be made at least partially from plastic. In particular, the entire cartridge can be made of plastic, with its individual components being made of the same or different types of plastic, depending on better suitability. In principle, however, other materials, such as metal, can also be used.

For ease of manufacture, at least some (and ideally all) of the cartridges in the kit may each be one-piece, i. H. in one continuous piece. For example, production by injection molding from plastic can be suitable for this. The movable pistons can also be manufactured separately.

According to one embodiment, for at least one (and ideally for each) cartridge of the set, an area ratio of the discharge openings of the inner and outer chambers is approximately equal to an area ratio of the cross sections of the inner and outer chambers. As a result, an approximation or equality of the discharge speed of both components can be achieved with a typically simultaneous axial displacement of both pistons. The same discharge speed of both components of the two-component mass can, for example, promote their mixing and other application properties during the squeezing process.

According to one embodiment, the coaxial cartridge set comprises several cartridges with different mixing ratios of between 1:1 and 10:1 for the second and the first component of the two-component mass. In particular, the coaxial cartridge set can have at least two cartridges with different mixing ratios of 1:1, 2:1, 3:1, 5:1, 7:1 and/or 10:1. However, this is not limiting. On the contrary, other mixing ratios, which are fundamentally arbitrary, can also be realized in the manner described herein.

In a specific embodiment, the front face of each cartridge has a connecting piece on the side facing away from the inner and outer chambers, into which both the discharge opening of the inner chamber and the discharge opening of the outer chamber open and which is used to connect a mixer for mixing the first and the second component of the two-component mass is formed during the squeezing process. As a result, the two different components can be particularly are effectively mixed into the two-component mass that is ultimately applied.

According to a further aspect, a system for storing and dispensing a flowable two-component mass is provided. The system comprises on the one hand a coaxial cartridge set of the type presented here and on the other hand a support structure with a receptacle that is at least partially cylindrical on the inside, the shape and size of which are dimensioned for inserting and holding each individual cartridge for squeezing the two-component mass out of it. In particular, the inside shape and size of the receptacle of the support structure can essentially correspond to the mutually identical external geometry of the coaxial cartridges, so that for example only a minimal cylindrical annular gap remains between them, which is unavoidable for insertion and removal.

According to one embodiment, the system also includes the mixer already mentioned above, which is designed to be connected to a connecting piece on the front face of the respective cartridge and to mix the first and the second component of the two-component mass during the squeezing process.

• Einlegen einer Kartusche des Sets, in deren Innen- und Außenkammer die erste bzw. zweite Komponente der auszubringenden Zweikomponentenmasse aufgenommen sind, in die hierfür vorgesehene Aufnahme der Stützstruktur; und
• Auspressen der ersten Komponente aus der Innenkammer und der zweiten Komponente aus der Außenkammer durch ein gleichzeitiges axiales Bewegen des Innenkolbens und des Außenkolbens zur vorderen Stirnseite der Kartusche hin.

According to a further aspect, a method for expressing a flowable two-component mass from a coaxial cartridge of a system of the type set forth herein is provided. The procedure includes the following steps:

• Insertion of a cartridge of the set, in the inner and outer chamber of which the first and second component of the two-component mass to be dispensed are accommodated, in the receptacle of the support structure provided for this purpose; and
• Pressing out the first component from the inner chamber and the second component from the outer chamber by simultaneously moving the inner piston and the outer piston axially towards the front end of the cartridge.

BRIEF DESCRIPTION OF THE DRAWINGS

Figur 1

einen Längsschnitt einer in einer Stützstruktur eingelegten Koaxialkartusche gemäß einem Ausführungsbeispiel eines Systems der hierin dargelegten Art zum Aufbewahren und Ausbringen einer fließfähigen Zweikomponentenmasse;

Figur 2a

einen Längsschnitt der Kartusche aus Fig. 1 ohne die Stützstruktur;

Figur 2b

eine Draufsicht auf die vordere Stirnseite der Kartusche der Fig. 2a;

Figur 3a

einen Längsschnitt einer weiteren Kartusche des Systems der Fig. 1 mit einem von der Kartusche der Fig. 2a abweichenden Mischungsverhältnis; und

Figur 3b

eine Draufsicht auf die vordere Stirnseite der Kartusche der Fig. 3a.

The above aspects of the invention and their embodiments and specific configurations are explained in more detail below with reference to exemplary embodiments illustrated in the drawings. The drawings are schematic. They can, but do not have to, be to scale. Show it:

figure 1

a longitudinal section of an inserted in a support structure coaxial cartridge according to an embodiment of a system of the type set out herein for storing and dispensing a flowable two-component mass;

Figure 2a

a longitudinal section of the cartridge 1 without the support structure;

Figure 2b

a plan view of the front face of the cartridge Figure 2a ;

Figure 3a

a longitudinal section of another cartridge of the system 1 with one of the cartridge of Figure 2a different mixing ratio; and

Figure 3b

a plan view of the front face of the cartridge Figure 3a .

DESCRIPTION OF EMBODIMENTS

figure 1 shows in a schematic longitudinal section an example of a system 1 of the type presented herein, wherein in 1 only one of several coaxial cartridges 2 of the coaxial cartridge set is shown, which is inserted into a hollow-cylindrical receptacle of a support structure 3 for squeezing out the two-component mass contained therein. In Figures 2a and 2b the cartridge 2 is off 1 in two different views without the support structure 3 can be seen. Figures 3a and 3b show corresponding views of another coaxial cartridge 20 of the system 1, which is designed for a different mixing ratio than the cartridge 2, but with the same support structure 3 as in FIG 1 is usable.

In this example, the coaxial cartridges 2 and 20 are made of plastic. In order to simplify the manufacture of these cartridges, they can be manufactured in one piece, as can be seen in the figures, with the exception of the movable pistons. The same can also apply to the support structure 3 .

Figure 2a shows cartridge 2 1 without the support structure 3 in one of 1 corresponding longitudinal section. The cartridge 2 comprises a hollow-cylindrical inner wall 4 and a hollow-cylindrical outer wall 5 arranged around it with a common cylinder axis A and in this example a circular cross-section (cf. Figure 2b ). As a result, an inner chamber 6 delimited radially by the inner wall 4 and an outer chamber 7 arranged radially between the inner wall 4 and the outer wall 5 are formed. When the cartridge 2 is used as intended, a first component of the two-component mass to be dispensed is accommodated in the inner chamber 6 , while a second component of the two-component mass is accommodated in the outer chamber 7 . The longitudinal section of Figure 2a is along the cylinder axis A and the (radial) cross-section of the Figure 2b taken perpendicular to the cylinder axis A of the cartridge 2.

right in Figure 2a the cartridge 2 has a front face 8 provided for dispensing the two-component mass. This closes the inner chamber 6 and the outer chamber 7 forward in the axial direction, but has a discharge opening 9 for the first component in the area of the inner chamber 6 and a discharge opening 10 for the second component in the area of the outer chamber 7 . The two dispensing openings 9 and 10 open into a connecting piece 11. This is in the front face 8 on the outside of the inner and outer chambers 6, 7 for connecting (e.g. by putting on or screwing on) a mixer (not shown). designed for mixing the first and the second component of the two-component mass during the squeezing process.

The cartridge 2 also includes an inner piston 12 that closes the rear of the inner chamber 6 and can be moved axially therein, and an outer piston 13 that closes the rear of the outer chamber 7 and can be moved axially therein 1 To the right, the two-component mass can be pressed out of the cartridge 2 through the dispensing openings 9 and 10 and the connecting piece 11 .

Figure 2b shows a plan view of the front face 8 of the cartridge 2 according to FIG Figure 2a from outside the cartridge 2, ie with a view of its connecting piece 11. In this example, the cartridge 2 can be designed for a mixing ratio of 5:1 of the second component that can be accommodated in the outer chamber 7 to the first component that can be accommodated in the inner chamber 6. As mentioned above and in the claims, the mixing ratio corresponds to a cross-sectional ratio of the outer chamber 7 to the inner chamber 6.

Figures 3a and 3b show in views accordingly Figures 2a and 2b an example of another cartridge 20 of the system 1 of 1 with one of the cartridge 2 the Figures 2a-2b different mixing ratio of e.g. 3:1. Incidentally, this applies to the Figures 2a and 2b as stated above.

• Um zu gewährleisten, dass die für die erforderliche Stützstruktur 3 (vgl. Fig. 1) notwendige Außengeometrie der Kartuschen 2, 20 usw. auch bei variierenden Mischungsverhältnissen gleichbleibt, wird vorliegend nur der Durchmesser des innenliegenden Rohres (d. h. der kreiszylindrischen Innenwand 4) verändert und somit auch das Mischungsverhältnis der ausgebrachten Masse. Die beiden Kolben 12 und 13, ringförmig für den Außenkolben 13 und kreisförmig für den Innenkolben 12, werden bei der Herstellung der Kartuschen 2, 20, ... des Sets entsprechend den Durchmessern der Rohre der Innenwand 4 und der Außenwand 5 angepasst.

Using the example of the different cartridges 2 and 20 according to Figures 2a-2b respectively. Figures 3a-3b is the following principle of the present cartridge set and system 1 with a common support structure 3 ( 1 ) illustrates:

• In order to ensure that the required support structure 3 (cf. 1 ) necessary outer geometry of the cartridges 2, 20, etc. remains the same even with varying mixing ratios, only the diameter of the inner tube (ie the circular-cylindrical inner wall 4) is changed in the present case and thus also the mixing ratio of the applied mass. The two pistons 12 and 13, ring-shaped for the outer piston 13 and circular for the inner piston 12, are adapted during manufacture of the cartridges 2, 20, ... of the set according to the diameters of the tubes of the inner wall 4 and the outer wall 5.

In the case of cartridges which are produced in one piece in this example, the connecting piece 11 with the dispensing openings 9 and 10 is also displaced radially in a corresponding manner in order to enable both masses to flow out. Here, an area ratio of the discharge openings 9 and 10 according to the cross-sectional ratio of the two tubes (ie chambers 6 and 7) is advantageous in order to achieve an approximation of the discharge speed of both masses. this is in Figures 2a-2b for a ratio of 5:1 and in Figures 3a-3b for a ratio of 3:1: With a mixing ratio of 3:1, for example (mass outside: mass inside), the cartridge outlet (connecting piece 11) must be moved radially accordingly so that the two dispensing openings 9 and 10 also have a ratio of 3 :1.

With this set of coaxial cartridges 2, 20, .

Claims (10)

Coaxial cartridge set with several coaxial cartridges (2, 20), each of which includes the following for storing a flowable two-component mass and for inserting it into a support structure (3) for pressing the mass out of the cartridge (2, 20): - a hollow-cylindrical inner chamber (6) for accommodating a first component of the two-component mass and a hollow-cylindrical outer chamber (7) arranged coaxially around this for accommodating a second component of the two-component mass, the inner and outer chambers (6, 7) being on a front end face (8) the cartridge (2, 20) is closed except for one discharge opening (9, 10) per chamber (6, 7); as an inner piston (12) which closes the rear of the inner chamber (6) and can be moved axially therein, and an outer piston (13) which closes the rear of the outer chamber (7) and can be moved axially therein; - the external chambers (7) of all the cartridges (2, 20) of the set having a geometry that is substantially identical on the outside so that they can be used with one and the same support structure (3), and at least two of the cartridges (2, 20) for different ones from one another Mixing ratios of the two components are formed by the inner chambers (6) are of different sizes in the radial cross section. The coaxial cartridge set of claim 1, wherein - in each cartridge (2, 20) of the set, the hollow-cylindrical inner chamber (6) has a circular radial cross-section and the hollow-cylindrical outer chamber (7) has an annular radial cross-section;
all cartridges (2, 20) of the set have the same outer diameter of the outer chamber (7) and the at least two of Cartridges (2, 20), which are designed for mutually different mixing ratios of the two components of the two-component mass, differ in the diameter of their inner chambers (6). A coaxial cartridge set according to claim 1 or 2, wherein - At least some cartridges (2, 20) of the set apart from their movable pistons (12, 13) are each formed in one piece. Coaxial cartridge set according to any one of the preceding claims, wherein - With at least one, preferably with each, cartridge (2, 20) of the set, an area ratio of the discharge openings (9, 10) of the inner and outer chamber (6, 7) equal to an area ratio of the radial cross sections of the inner and outer chamber ( 6, 7) is. Coaxial cartridge set according to one of the preceding claims, which - Cartridges (2, 20) with mutually different mixing ratios of between 1:1 and 10:1 of the second to the first component of the two-component mass, the mixing ratio of a cartridge (2, 20) being determined by a radial cross-sectional ratio of its inner and outer chamber ( 6, 7) is given. A coaxial cartridge set according to claim 5, which - has at least two cartridges (2, 20) with mutually different mixing ratios of 1:1, 2:1, 3:1, 5:1, 7:1 and/or 10:1. Coaxial cartridge set according to any one of the preceding claims, wherein - The front face (8) of each cartridge (2, 20) has a connecting piece (11) on its side facing away from the inner and outer chamber (6, 7), into which the dispensing openings (9, 10) of the inner and of the outer chamber (6, 7) and which is designed to connect a mixer for mixing the first and the second component of the two-component mass during the squeezing process. System (1) for storing and applying a flowable two-component mass, comprising: - A coaxial cartridge set according to any one of the preceding claims; and - a support structure (3) with a receptacle that is cylindrical at least in sections on the inside, the shape and size of which essentially corresponds to an external geometry of the coaxial cartridges (2, 20) for inserting and holding each coaxial cartridge (2, 20) of the set when the two-component mass is pressed out. The system (1) of claim 8, further comprising - A mixer which is designed to be connected to a connecting piece (11) on the front face (8) of the respective cartridge (2, 20) and to mix the first and the second component of the two-component mass during the squeezing process. Method for squeezing a flowable two-component mass out of a coaxial cartridge (2, 20) of a system (1) according to Claim 8 or 9, comprising the steps: - Inserting a cartridge (2, 20) of the set into the receptacle of the support structure (3) provided for this purpose; and - Squeezing the first component out of the inner chamber (6) and the second component out of the outer chamber (7) by simultaneously moving the inner piston (12) and the outer piston (13) axially towards the front face (8) of the cartridge (2, 20) there.

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