CH713939A1 - Aerosol cans arrangement. - Google Patents

Abstract

The aerosol can arrangement has an outer box (1) and at least one inner and inner box (10) which is stable in terms of shape and pressure. The outer box (1) is provided with a lid (3) having an opening into which a valve device (20) is inserted. The valve device (20) has one each with the interior of the outer box (1) and an outlet valve connected to the interior of the inner box (10). The two exhaust valves are actuated jointly by means of an actuator. Since the outer diameter of the inner box (10) is greater than the diameter of said opening, the valve device (20) from above into the opening of the head part (3) is inserted and the inner box (10) screwed from below to the valve device (20).

Description

The invention relates to an aerosol can assembly with a pressure-resistant outer box and at least one inner container, wherein in the outer box a first component and in the at least one inner container, a further component is added.

Generic aerosol can arrangements are used for example to produce a foam consisting of at least two components. For such 2K foams, various aerosol packaging systems are used.

For example, from EP 0 111 089 a 2-component aerosol can is known, which is provided with two independent, filled with different components chambers. The first chamber is formed by the actual main can, in which the first component is received in preferably liquid form. The second chamber is formed by an inner container in which the second, the curing of the discharged foam accelerating component is filled. This second component is preferably also liquid. Each chamber of the aerosol can is connected to a lockable, outwardly leading outflow channel.

Such a can has the advantage that the two components are mixed only after leaving the outer box or the inner container, so that the can can be used several times at intervals.

If the inner container is formed by a flexible bag, there is an advantage that the bag can be comparatively large, i. may have a comparatively large volume, since the bag can be folded from above the opening into the can introduced. However, a disadvantage of a flexible bag is that the pressure in the bag is at least approximately the same as in the interior of the outer box surrounding the bag, which is unfavorable for certain applications. Another disadvantage is that the bag bursts at a relatively low pressure. It is therefore not possible the bag with filling material and liquefied gas such. Propane-butane 4.2 or dimethyl ether to fill without being installed in the gassed outdoor box.

Also known are also 2-component aerosol cans, in which the inner container is formed pressure and dimensionally stable. However, the inner container is comparatively small in these embodiments, since it is inserted from above the opening in the lid in the outer box. The opening of the standard aerosol can is one inch and thus limits the outside diameter of the inner container. These inner containers can be filled and gassed without being installed in the aerosol can, which has proven to be very advantageous in practice.

Based on the described prior art, the object of the invention is to develop a trained according to the preamble of claim 1 aerosol can arrangement such that the inner box has a comparatively large volume and the internal pressure can be selected independently of the pressure in the outer box.

The solution of the problem is defined by the features in the characterizing part of claim 1. In that the aerosol can arrangement is provided with an outer box provided with a head part, at least one inner box and with a valve device which has an outlet valve which communicates with the inside of the outer box and with the inside of the inner box, wherein the outlet valves can be actuated jointly by means of an actuating member are and the head portion of the outer box is provided with an opening into which the valve device is inserted, wherein the inner box is formed form and pressure stable, and wherein the outer diameter of the inner box is greater than the diameter of said opening of the head portion of the outer box is created the basic requirement that the inner box can have a comparatively large volume and the internal pressure can be selected independently of the pressure in the outer box.

Preferred embodiments and further developments of the aerosol can arrangement are described in the dependent claims 2 to 9.

It is thus provided in a preferred development that the head part is designed as a lid, which is placed from above on the outer box and connected in a gastight manner with this. As a result, the outer box can be made comparatively easily and the inner box can be inserted into the outer box before attaching the lid.

Preferably, the valve device is inserted from above into the lid and gas-tight connected thereto. This design also favors that the aerosol can assembly can be made comparatively easy. In addition, the valve device may optionally be attached to the lid before the lid is attached to the outer box.

In a particularly preferred embodiment, the inner box is attached from the bottom to the valve device. The attachment of the inner box from the bottom of the valve device is also relatively easy to implement.

In a further preferred embodiment of the aerosol can assembly, the valve device has a hollow cylindrical, provided with an external thread extension, which is in communication with an outlet valve, wherein the inner box has a closure flange which is provided with a corresponding to the external thread of the extension internal thread , And wherein the external thread of the extension is screwed into the internal thread of the flange. This training allows with comparatively few parts a fast and secure connection of the inner box with the valve device and a fastening of the inner box.

Preferably, the internal thread is arranged eccentrically in the flange of the inner box. This design allows to align the inner box by twisting, which is advantageous or essential in connection with an extension arranged eccentrically on the valve device and in particular with large inner doses.

Particularly preferably, the extension has a cylindrical portion to which the external thread adjoins, wherein the closure flange has a hollow cylindrical portion disposed above the internal thread, and wherein on the cylindrical portion of the extension, a sealing ring is arranged, the gas-tight on the hollow cylindrical Section of the closure flange comes to rest. With this design, gas-tight sealing of the closure flange is made possible on the extension independently of the angular position of the inner box with respect to the valve device.

Preferably, the pressure in the outer box is different from the pressure in the inner box. This allows a particularly flexible use of the aerosol can assembly and a wide range of applications.

Finally, the inner box preferably has a volume which corresponds to at least 20% of the usable volume of the outer box. This training also allows a universal use of the aerosol can assembly.

A further object of the invention is to develop a method for producing an aerosol can arrangement according to the preamble of claim 10 provided with an outer box and an inner box accommodated therein such that the aerosol can arrangement can be used particularly flexibly and an inner box with a comparatively large volume has.

This object is solved by the features in the characterizing part of claim 10. By the inner box is inserted into the outer box in the preparation of the aerosol can assembly before the lid is attached to the outer box and gas-tight, the inner box can be formed independently of the opening in the lid. As a result, internal doses can be used, which have a large outer diameter.

Preferred developments of the method are defined in the dependent claims 11 to 17.

Thus, in a particularly preferred embodiment of the method is provided that first the valve device is attached to the head part, that then the inner box is screwed to an extension of the valve device and that thereafter the lid is attached to the outer box. This process sequence for the production of the aerosol can arrangement has proved to be particularly fast, advantageous and cost effective in practice.

In a further preferred embodiment of the method, in which the attachment of the valve device serving internal thread is arranged eccentrically in the end flange, the inner box when screwed to the valve device is rotated so far that in the end position whose longitudinal central axis in the direction of the longitudinal center axis of the valve device is shifted, so that in the assembled state of the aerosol can assembly, the distance between the inner wall of the outer box and the longitudinal central axis of the inner box is greater than half the outer diameter - radius - the inner box. In this way, particularly large indoor doses can be used.

Preferably, after the gas-tight fastening of the valve device to the lid as well as the lid to the outer box, the inner box as well as the outer box filled via the respective outlet valve with the male component or the components to be accommodated therein. This is an easy way to fill the two cans.

Particularly preferably, the inner box is filled with active ingredient before it is screwed to the valve. After screwing it is fumigated through the valve.

Filling the inner box is much easier to accomplish if this is done before screwing to the valve device and not afterwards. In addition, the outer box is also filled with active ingredient as long as the filled and fumigated inner container is not installed. After filling, the combination of valve - lid - inner container is inserted into the can, sealed gas-tight and fumigated through the valve. This is also relatively easy to do.

In a preferred embodiment of the method filled with active substance and screwed to the valve device inner canister is gassed through the outlet valve. This sequence when filling the inner box is particularly easy to implement.

Preferably also filled with active ingredient and the combination valve device - lid - inner box filled and gas-tight sealed outer box is gassed through the outlet valve. Also, this sequence for filling the outer box is particularly easy to implement.

Preferably, the inner box as well as the outer box is filled with a propellant gas so that prevails in the respective can an overpressure between 1 and 10 bar. This results in such a dose of aerosol can a wide range of applications.

Finally, in claim 18 even more preferred uses claimed inventively aerosol can assembly claimed.

From the following detailed description and the totality of the claims, there are further advantageous embodiments and feature combinations of the invention.

The figures of the drawings used to illustrate an embodiment show:

1 shows the essential components of the aerosol can arrangement,

2 shows two elements of the aerosol can arrangement in an enlarged view in section,

3 is a snapshot during the assembly of the aerosol can assembly in section,

Fig. 4 is a section through the ready assembled aerosol can assembly.

Fig. 1 shows essential components of the aerosol can arrangement partially in a sectional and simplified representation. Namely, an outer box 1 in a sectional view, a head part in the form of a lid 3 in a sectional view, an inner box 10 in a sectional view, a closure flange 14 for the inner box in a sectional view and in a view from above, a valve device 20 in a sectional view and in a view from above, as well as a spray head 30 shown in a sectional view and in a side view.

The substantially hollow cylindrical outer box 1 is formed with a domed, i. concave inward arched bottom 2 provided. The serving as the upper end of the outer box 1 cover 3 is provided with a central opening 4 for receiving the valve device 20. The lid 3 has a circumferential shoulder 5, by means of which it can be connected in a gastight manner along the circumference with the outer box 1, as will be explained in more detail below. On the top of the lid 3 is provided with a circumferential collar 7, which is produced by crimping of the base material 8 of the lid 3.

The round closure flange 14 serves as upper end for the inner box 10. In this closure flange 14, a bore 15 is recessed, which has an upper, hollow cylindrical portion 16 and a lower portion provided with an internal thread 17. By means of the closure flange 14, the inner box 10 is closed on the one hand. On the other hand, the inner box 10 can be connected via the closure flange 14 with the valve device 20 and positioned and fixed within the outer box 1. Preferably, the bore 15 is arranged eccentrically in the closure flange 14, which is particularly advantageous or necessary for large inner cans 10 in connection with the valve device 20 shown here. From the plan view of the closure flange 14, the eccentric arrangement of the bore 15 is clearly visible. The closure flange 14 must be gas-tight along its circumference with the inner wall of the inner box 10, as will be explained in more detail below.

The outer box 1, the lid 3 and the inner box 10 are made of a metal, preferably made of a steel sheet or aluminum.

The valve device 20 comprises two outlet valves 21,22 and a hollow cylindrical extension 23 which is provided with an external thread 25. The extension stands with the one outlet valve 21 in connection. From the top view of the valve device 20 it can be seen that the center of the respective outlet valve 21, 22 is arranged on a concentric circular line KL on the valve device 20. The extension 23 is thereby arranged eccentrically with respect to the center of the valve device 20.

The eccentricity of the bore 15 of the closure flange 14, i. the distance between the center Z1 of the bore 15 and the center Z of the closure flange 14 preferably corresponds approximately to the eccentricity of the extension 23, i. the radial distance between the longitudinal center axis of the extension 23 and the center of the valve device 20th

Finally, the spray head 30 can be seen, which is provided with a central actuating button 31 and two associated actuators in the form of rams 32, 33 for simultaneously opening the two outlet valves 21,22 of the valve device 20. The spray head 30 has a tubular discharge member 34 for discharging and possibly applying the components received in the two cans 1, 10.

The lid 3 of the outer box 1 is provided in the present example with a standard opening 4, which has a diameter D1 of one inch (about 25.4 mm). The pressure and dimensionally stable inner box 10 has a comparatively large volume in the present example. In the illustrated example, the outer diameter D2 of the inner box 10 is greater than the diameter D1 of the opening 4 in the lid 3, that is greater than one inch. As a result, the inner box 10 can not be inserted through the opening 4 of the fixed to the outer box 1 cover 3 in the outer box 1, as is usually the procedure for the assembly of generic aerosol can arrangements. In conventional aerosol can assemblies, the lid is first attached to the outer box and then the inner box attached to the valve assembly is inserted through the opening in the lid into the outer box. Thereafter, the valve device is gas-tightly connected to the lid.

2 shows an enlarged section of the closure flange 14 together with the valve device 20 in section. It can be seen that the extension 23 has a cylindrical portion 24, to which the external thread 25 connects on the underside. On the cylindrical portion 24, a sealing ring 26 is arranged. The closure flange 14 in turn has above the internal thread 17 on a hollow cylindrical portion 16 whose inner diameter is matched to the outer diameter of the cylindrical portion 24 of the extension 23 together with the sealing ring 26 such that the sealing ring 26 sealingly against the hollow cylindrical portion 16 of the closure flange 14th can create. This training ultimately allows a gas-tight connection between the inner box 10 and the valve device 14 regardless of the end position - angular position / rotational position -beim when screwing the inner box 10 to the valve device 20. In addition, a arranged on the top of the valve device 20 collar 27 can be seen , on the underside of a sealing ring 28 or a flat gasket is arranged.

Fig. 3 shows a snapshot during assembly of the aerosol can assembly in section. The inner box 10 is already closed by means of the closure flange 14 on the upper side and screwed to the extension 23 of the valve device 20. The valve device 20 in turn is inserted into the lid 3 and secured thereto. A gas-tight connection between the valve device 20 and the cover 3 is ensured by the arranged under the collar 27 of the valve device 20 sealing ring 28. Since the outer diameter D2 of the inner box 10 is greater than the diameter D1 of the opening in the lid 3 (see Fig. 1), first the valve device 20 is inserted from above into the lid 3 and only then the inner box 10 from the underside of the extension 23 of the valve device 20 screwed. The gas-tight fastening of the valve device 20 to the cover 3 can possibly also be done after screwing the inner box 10 to the valve device 20. In any case, attached to the valve device 20 inner box 10 is inserted from above into the outer box 1 and the lid 3 then gas-tightly connected to the outer box 1. When tightening the inner box 10 to the valve device 20 care must be taken - at least for inner boxes 10 from a certain diameter - that the inner box 10 occupies a certain angular position in the end position. By the arranged on the extension 23 sealing ring 26 is thereby ensured that the inner box 10 is connected in a gastight manner with the valve device 20 regardless of the end position or the angular position of the inner box 10 in relation to the valve device 20th

Since the hollow cylindrical extension 23 of the valve device 20 is not arranged centrally on the valve device 20, the bore has to be arranged eccentrically in the closure flange 14 together with the internal thread from a certain size or diameter of the inner can 10 in relation to the inner diameter of the outer can 1 be so that the inner box 10 can be received in the outer box 1. When screwing the inner box 10 on the extension 23 must therefore be taken to ensure that the longitudinal center axis L1 of the inner box 10 so far shifted to the longitudinal center axis L2 of the valve device 20 and the outer box 1 out - twisted - that the distance A1 between the inner wall of the External box 1 and the longitudinal center axis L1 of the inner box 10 is greater than half the outer diameter - radius - r of the inner box 10 or in other words r <A1. Although here an inner box 10 is shown with a comparatively small outer diameter, and indoor cans can be screwed to the closure flange 14, whose radius is greater than A1. In this case, as mentioned above, care must be taken that by rotating the inner box 10, its longitudinal central axis L1 is displaced toward the longitudinal central axis L2 of the outer box 1.

The assembly and filling of the aerosol can arrangement proceeds as follows, wherein some of the method steps described below may possibly also be carried out in the reverse order, and assuming that the closure flange 14 is already inserted into the inner box 10 and gas-tight along its circumference is connected to the inner wall of the inner box 10 and the valve device 20 in turn is already gas-tightly connected to the lid 3: First, the inner box 10 is filled with the active ingredient or the active ingredients. Thereafter, the inner box is screwed to the extension 23 of the valve device 20, wherein care is taken in large internal doses that the inner box 10 is rotated in the end position relative to the valve device 20 so far that the longitudinal center axis L1 of the inner box 10 in the radial direction to the longitudinal center axis L2 the outer box 1 is moved towards; Ideally, the two longitudinal center axes L1, L2 are substantially coaxial with each other. Finally, the inner can 10 is gassed through the valve 21.

Next, the outer box 1 is filled with the active ingredient or agents, taking care that only as much active ingredient is filled, as after insertion of the inner box 10 in the outer box 1 can still be recorded. Thereafter, the inner box 10 is inserted into the outer box 1, namely the combination valve device 20- lid 3- inner box 10, and the lid 3 then gas-tightly connected to the outer box 1. Subsequently, the outer box 1 is gassed through the valve 22. Normally, the spray head is first placed on the construction site by the end user.

Preferably, the inserted into the cover 3 of the outer box 1 valve device 20 is fixed by means verclinchen therein, being achieved by the coming between the underside of the circumferential collar 27 of the valve device 20 and the top of the lid 3 for use sealing ring 28, a gas-tight seal ,

It should be mentioned that in addition to the gassing optionally also the filling of the inner box 10 and / or the outer box 1 by the respective valve 21, 22 can be carried out.

Finally, Fig. 4 shows the finished aerosol can arrangement in section. After the two cans were filled, the spray head 30 was still attached. By actuating the spray head 30, the two plungers 32, 33 are pressed down against the respective outlet valve 21, 22 and open it, so that the respective component or the respective components flow out of the respective can 1, 10 and exit via the discharge member 34 can. If necessary, the discharge element 34 can be provided with mixing baffles, which promote thorough mixing of the components emerging from the two cans 1, 10. Such an aerosol can arrangement has the advantage that the components accommodated in the two cans 1, 10 are brought together only outside the respective can 1, 10 and therefore a chemical-physical reaction also takes place outside the cans. As a result, the aerosol can arrangement is preferably suitable for multiple use.

In the present example, the outer box 1 by way of example has an internal volume of about 560 cm3 while the inner box 10 by way of example has an internal volume of about 150 cm3. Of course, reduces the inner volume of the outer box 1 with inserted inner box 10 by the total volume including the attachments, so that in the outer box with inserted inner box a recording volume of about 390 cm3 remains. In the assembled state of the aerosol can assembly, the inner can 10 thus has a receiving volume in the order of about 40% of the usable receiving volume of the outer box 1. That is, in other words, the usable receiving volume of the outer box 1 is about 2.5 times larger than that usable take-up volume of the inner box 10. Depending on the type of components to be accommodated, the usable take-up volume of the inner box 10 may be between approximately 20% and 80% of the receiving volume of the outer box 1. In any case, with such an aerosol can arrangement on the one hand the receiving volume of the inner box 10 can be comparatively large and on the other hand the pressure in the inner box 10 can be selected independently of the outer box 1.

To form a 2K foam such as a PU foam is in that box with the larger volume, in the present example, the outer box 1, usually the actual main component, for example, a liquefied prepolymer taken together with two liquefied propellants, while in the smaller can, in the present example, the inner can 10, a hardening of the main component accelerating hardener or catalyst is taken together with a liquefied propellant gas, wherein the curing agent or catalyst is preferably also present in liquefied form.

In summary, it can be stated that an aerosol can arrangement designed according to the invention can be used in a particularly flexible manner, in that a wide variety of components in the respective can 1, 10 can be accommodated. This is on the one hand achieved in that the outer diameter of the inner box 10 is greater than the diameter D1 of the opening 4 in the head part 3 of the outer box 1. By the inner box 10 on the other hand formed form and pressure stable, the pressure in the inner box 10 regardless of the Pressure in the outer box 1 can be selected, which is also advantageous in terms of universal applicability.

However, the described embodiment is by no means to be considered exhaustive. Thus, it is quite possible within the scope of the invention to provide more than one inner container. Thus, in addition to a first dimensionally stable and pressure-resistant inner can, a second form-fitting and pressure-stable inner can be accommodated in the outer container. It is understood that the valve device must be provided with a further outlet valve. But even the use of a second inner container, which is not formed form and pressure stable, but for example in the form of a bag, is quite possible.

LIST OF REFERENCES: 1. outer box 2. bottom 3. head part (lid) 4. opening (1 ") 5. shoulder 6. 7. collar 8. flanging 9. 10. inner box 11. floor 12. upper end area 13. 14 Locking flange 15. Bore 16. Hollow cylindrical section 17. Internal thread 18. Sealing ring 19. 20. Valve device 21. Outlet valve 22. Outlet valve 23. Extension 24. Cylindrical section 25. External thread 26. Sealing ring (extension) 27. Collar 28. Sealing ring (collar ) 29. 30. Spray head 31. Operating knob 32. Plunger 33. Plunger 34. Discharge member 35.

Claims (18)

claims An aerosol can assembly comprising an outer box (1) provided with a head part (3), at least one inner box (10) and with a valve device (20), one each with the inside of the outer box (1) and one with the inside of the inner box (10 ) associated outlet valve (21, 22), which exhaust valves (21,22) by means of an actuating member (30) are actuated together, characterized in that the head part (3) of the outer box (1) provided with an opening (4) is, in which the valve device (20) is inserted, wherein the inner box (10) is formed form and pressure stable, and wherein the outer diameter (D2) of the inner box (10) is greater than the diameter (D1) of said opening (4th ) of the head part (3) of the outer box (1). 2. aerosol can assembly according to claim 1, characterized in that the head part as a lid (3) is formed, which is placed from above on the outer box (1) and connected in a gastight manner with this. 3. aerosol can assembly according to claim 1 or 2, characterized in that the valve device (20) inserted from above into the lid (3) and is connected thereto in a gastight manner. 4. aerosol can assembly according to claim 3, characterized in that the inner box (10) from the underside of the valve device (20) is attached. 5. aerosol can assembly according to claim 4, characterized in that the valve device (20) has a hollow cylindrical, with an external thread (25) provided extension (23) which communicates with an outlet valve (21), wherein the inner box (10) has a Closing flange (14) which is provided with a to the external thread (25) of the extension (23) corresponding internal thread (17), and wherein the external thread (25) of the extension (23) in the internal thread (17) of the flange (14 ) is screwed. 6. aerosol can assembly according to claim 5, characterized in that the internal thread (17) is arranged eccentrically in the flange (14). 7. aerosol can assembly according to claim 5 or 6, characterized in that the extension (23) has a cylindrical portion (24) to which the external thread (25) adjoins and the closure flange (14) above the internal thread (17) arranged hollow cylindrical Section (16), wherein on the cylindrical portion (24) of the extension (23) a sealing ring (26) is arranged, the gas-tight manner on the hollow cylindrical portion (16) of the closure flange (14) comes to rest. 8. aerosol can assembly according to one of the preceding claims, characterized in that the pressure in the outer box (1) is different from the pressure in the inner box (10). 9. aerosol can assembly according to one of the preceding claims, characterized in that the inner box (10) has at least 20% of the usable volume of the outer box (1). 10. A method for producing an aerosol can arrangement provided with an outer box (1) and an inner box (10) accommodated therein, the outer box (1) having a head part (3) provided with an opening (4), and wherein in the opening (4 ) of the head part (3) a valve device (20) is inserted, which has one each with the interior of the outer box (1) and with the interior of the inner box (10) in connection outlet valve (21,22), and wherein the outer diameter (D2) of the inner box (10) is greater than the diameter (D1) of said opening (4) of the head part (3) of the outer box (1), characterized in that the inner box (10) is inserted into the outer box (1) before the lid (3) is attached to the outer box (1) and gas-tight connected. 11. The method according to claim 10, characterized in that first the valve device (20) is attached to the head part (3), that thereafter the inner box (10) is screwed to an extension (23) of the valve device (20) and that thereafter the Cover (3) on the outer box (1) is attached. The method of claim 11, wherein the inner can (10) is provided with a closure flange (14) provided with an internal thread (17) for attachment to the valve device (20), the internal thread (17) being eccentric in the End flange (14) is arranged, characterized in that the inner box (10) when screwing to the valve device (20) is rotated so far that in the end position whose longitudinal central axis (L1) in the direction of the longitudinal central axis (L2) of the valve device (20) is shifted, so that in the assembled state of the aerosol can assembly, the distance (A1) between the inner wall of the outer box (1) and the longitudinal center axis (L1) of the inner box (10) is greater than half the outer diameter radius (r) of the inner box ( 10). 13. The method according to any one of claims 10 to 12, characterized in that the inner box (10) as well as the outer box (1) via the respective outlet valve (21,22) are filled with the component to be accommodated therein or the components to be accommodated therein. 14. The method according to any one of claims 10 to 12, characterized in that the inner can (10) is filled with active ingredient before it is screwed to the valve device (20) and the outer box (1) is filled with active ingredient before the combination valve device (20 ) - Lid (3) - inner box (10) in the outer box (1) inserted and gas-tight. 15. The method according to claim 14, characterized in that the drug-filled and screwed to the valve device (20) inner can (10) through the outlet valve (21) is gassed through. 16. The method according to claim 14, characterized in that the active ingredient and the combination valve device (20) - lid (3) - inner can (10) filled and gas-tight sealed outer box (1) through the outlet valve (22) is gassed through. 17. The method according to any one of claims 10 to 16, characterized in that the inner box (10) as well as the outer box (1) are filled with a propellant gas such that in the respective can (1, 10) an overpressure between 1 and 10 bar prevails. 18. Use of a trained according to one of claims 1 to 9 aerosol can assembly or a prepared according to a method according to any one of claims 10 to 17 aerosol can assembly for discharging and applying foams of all kinds, in particular polyurethane, isocyanurate, fire, silicone, epoxy -, polyester or silicate foam.