Method for manufacturing a dispenser container

Abstract

A process for manufacturing a dispenser container 1 is described, comprising the steps a1) Providing an outer container 2 made of a dimensionally stable material, wherein the outer container 2 has an outer container base 4, an outer container body 5 and an outer container head 10 having an outer container opening 12, wherein the outer container base 4, outer container body 5 and outer container head 10 define an outer container interior AIR, wherein the outer container base 4 has a closable opening 8, b1) Providing a preform 20, wherein the preform 20 consists at least partially of a blow-moldable plastic, c1) Heating the preform 20, d1) Inserting the preform 20 into the outer container 2, e1) Stretching of the preform 20 and impregnation of the outer container interior AIR via the opening 8 arranged in the outer container base 4 with a medium to generate a counter pressure PG to form an inner container body 6 with a predetermined inner container body volume.

Description

Technical field

[0001] The present invention relates to a method for manufacturing a dispenser container with an outer container and an inner container for receiving a filling material. State of the art

[0002] Dispensing containers with an outer and an inner container are known in various embodiments from the prior art. The contents are always contained in the respective inner container.

[0003] For example, DE 10 2014 113 535 A1 describes a dispenser container consisting of an outer container and an inner container. The outer and inner containers are made of two different blow-molded plastics, which are not bonded together. The plastic used for the inner container has lower dimensional stability than the plastic used for the outer container, so that the inner container deforms under negative pressure, while the outer container remains dimensionally stable. The outer container has a pressure equalization opening to equalize pressure between the outer and inner containers.

[0004] Dispenser containers are also known from the prior art in which a flexible plastic inner container is formed within a rigid outer container by a blow molding process. EP 2 246 267 B1, for example, discloses a dispenser container consisting of an outer, rigid container and a collapsible pouch that is housed inside the outer container. The collapsible pouch, a preform made of thermoplastic material, is inserted into the interior of the outer container and inflated there by a blow molding process. The resulting pouch forms a flexible inner container that can be compressed by pressure. The rigid outer container can be made of glass, aluminum, or a suitable plastic.

[0005] Dispensing containers for liquid, pasty, and viscous materials are often pressurized with a propellant. For example, DE 3 721 099 A1 describes a container for storing flowable substances. Part of the container is filled with a pressurized propellant gas, which moves a piston that in turn forces the contents out of the dispensing opening.

[0006] Dispenser containers, each comprising a rigid outer container and a flexible inner container, are also known from the publications DE 30 15 813 A1, DE 27 05 549 A1 and DE 93 08 887 U1.

[0007] From EP 1 136 388 A2, a dispenser pack is known comprising a cylindrical container and a piston movably arranged within the container. The piston divides the interior of the container into an upper chamber containing the contents and a lower chamber containing a propellant-filled pouch. The pouch exerts pressure on the contents via the piston, allowing the contents to be dispensed through a dispensing opening.

[0008] Finally, EP 1 792 847 B1 describes a dispenser arrangement comprising a container, a dispensing valve at the top of the container, and a filling valve at the bottom. The filling valve is connected to a tubular bag with a folded wall located inside the container. The bag exerts pressure on the contents via a piston, which can then be dispensed through a dispensing opening.

[0009] To enable the most complete possible removal of the contents, dispenser containers for liquid, pasty, and viscous materials known from the prior art are often complex in design and expensive to manufacture. In practice, they also exhibit increased susceptibility to malfunctions due to their multi-part construction.

[0010] Therefore, there is a need for processes that enable the cost-effective production of simply constructed dispenser containers for liquid, pasty, and viscous materials. Description of the invention

[0011] The invention, as characterized in the claims, is based on the objective of providing a method for manufacturing a simple and cost-effective dispenser container in which the contents contained in a flexible inner container can be removed essentially completely with the aid of a blowing agent.

[0012] This problem is solved according to the invention by the method for manufacturing a dispenser container according to claim 1 and the method for manufacturing a filled dispenser container according to claim 10. Further advantageous details, aspects and embodiments of the present invention will become apparent from dependent claims 2 to 9 and 11 to 14, respectively, the description, the examples and the drawings.

[0013] The inventive method for manufacturing a dispenser container comprises the steps a1) Providing an outer container made of a dimensionally stable material, wherein the outer container has an outer container base, an outer container body and an outer container head having an outer container opening, wherein the outer container base, outer container body and outer container head define an inner space of the outer container, wherein the outer container base has a closable opening, b1) Providing a preform, wherein the preform consists at least partly of a blow-moldable plastic, c1) Heating the preform, d1) Inserting the preform into the outer container, e1) Stretching of the preform and application of a medium to the inner container via the opening in the bottom of the outer container to generate a counter-pressure to form an inner container body with a predetermined inner container body volume.

[0014] An outer container used in the method according to the invention can be divided into the sections outer container base, outer container body, and outer container head. These terms are familiar to those skilled in the art. It is also known to those skilled in the art that the outer container head can be divided into the sections outer container nipple and outer container shoulder, although this distinction is not necessary for describing the present invention. It is also known to those skilled in the art that, due to the extremely wide variety of geometric shapes of outer containers, a sharp demarcation of the individual sections outer container base, outer container body, and outer container head is difficult. Nevertheless, it is not a problem for those skilled in the art to determine and distinguish the individual sections outer container base, outer container body, and outer container head from one another in the case of an outer container of any shape.The outer container base is generally suitable for placing the outer container on a surface. This also applies if, during normal use, the dispenser is intended to be placed "upside down," for example, on a lid attached to the outer container. The outer container body horizontally defines the portion of the outer container that receives the contents. This also applies to dispensers with a longitudinal axis that is not perpendicular to the surface. The optional outer container shoulder connects the outer container body to the outer container nipple.

[0015] The inventive method produces a dispenser container in which a plastic inner container is formed within a dimensionally stable outer container by a blow molding process. By pressurizing the interior of the outer container with a medium to generate counter-pressure for the formation of an inner container body with a predetermined volume, as provided for in the invention, an inner container can be produced with a quality not known from the prior art, which occupies a predetermined proportion of the volume of the outer container.

[0016] According to step e1) of the inventive method, the preform is stretch-blown, and the interior of the outer container is pressurized via the opening in the base of the outer container with a medium to generate back pressure, thereby forming an inner container body with a predetermined volume. This process step is to be understood as meaning that the two measures, namely stretch-blown and pressurization of the interior of the outer container, can be carried out in different temporal sequences. Stretch-blown can be performed first, and after a certain period, which is, for example, on the order of milliseconds, the pressurization of the interior of the outer container with a medium to generate back pressure can be carried out in addition to the stretch-blown process.Both processes can also be carried out simultaneously from the start. In this case, it is advantageous to begin the stretch blow molding process with a higher pressure than the application of the medium to generate back pressure. Alternatively, it is also possible to first apply back pressure and only then apply a stretch blow molding medium to the preform.

[0017] At the conclusion of the measures, i.e., at the point in time when the inner container body has been formed with the desired volume, the stretch blow molding and the impregnation with medium to generate a back pressure can be stopped simultaneously, or the stretch blow molding can be stopped before the impregnation with medium to generate a back pressure.

[0018] Various variations are conceivable with regard to the applied pressure. For example, stretch blow molding can be carried out at a specific, constant pressure, such as 8 to 9 bar, while the back pressure is gradually increased. Once the back pressure matches the pressure applied to the stretch blow molding medium, the pressure of the stretch blow molding medium and the back pressure can be reduced at the same rate.

[0019] It is known to those skilled in the art that stretch blow molding for the formation of the inner container body must be carried out at different pressures and over different periods of time, depending on the material of the blow-moldable plastic, in order to achieve the desired volume and wall thickness of the inner container body. The type of material used and the wall thickness of the inner container body, in turn, depend on the type of material with which the inner container is subsequently to be filled.

[0020] As will be explained in more detail below in connection with the inventive method for producing a filled dispenser container, after the inner container has been filled with the contents, a propellant is introduced into the interior of the outer container through a perforation in the bottom of the outer container. It is therefore necessary that the inner container does not occupy the entire volume of the outer container body, as a certain empty volume must be available into which the propellant can be poured.

[0021] The multitude of boundary conditions regarding the filling material, the material of the inner container, the wall thickness of the inner container, and the required empty volume for accommodating a blowing agent necessitates the empirical determination of the conditions for the blow molding process through a series of tests. Simple test series can determine which of the aforementioned variants, with respect to the temporal sequence of application of the stretch blow molding medium and the application of the counter-pressure medium, is most favorable for a specific combination of filling material, inner container material, inner container wall thickness, and required empty volume for accommodating a blowing agent.

[0022] If, for example, the period during which the stretch blow molding process is carried out without pressurizing the interior of the outer container with a medium to generate back pressure is defined, and the time profile of the pressure with which the respective pressurization is carried out is defined, then in a high-frequency series production, the stretch blow molding pressure and back pressure can subsequently be controlled automatically without further checks.

[0023] All mentioned (and unmentioned) variants aim to create an inner container body with a predetermined inner container volume. Such a creation of an inner container body, which occupies a defined, predetermined proportion of the volume of the outer container, is excellently ensured by the method according to the invention, namely in particular by pressurizing the interior of the outer container with a medium to generate back pressure.

[0024] The dispenser container produced by the inventive method can be used for liquid, pasty, and viscous materials, has a simple design, and can be manufactured cost-effectively. A particular advantage is that any type of piston for transferring pressure from the propellant to the material being dispensed is eliminated. This also eliminates the need for the costly and time-consuming painting of the outer container's surface facing the inner container. Since the propellant is in direct contact with the inner container and the pressure is thus transferred directly to the material being dispensed, no mechanically moving means for pressure transmission is required. There is no friction between, for example, a piston and the outer container's surface facing the inner container.

[0025] According to a preferred embodiment of the method according to the invention, the preform provided in step b1) comprises a cup-shaped molded body composed of at least two sections, wherein a first section forms a closed end of the molded body and a second section forms an open end of the molded body, the closed end being opposite the open end, wherein the first section is provided for forming an inner container body and the second section is provided for forming an inner container dispensing section arranged in the region of the outer container head and having a dispensing opening, wherein the first section is made of a blow-moldable plastic and the second section is made of a dimensionally stable plastic. The inner container of the dispenser thus comprises the inner container dispensing section and the inner container body.

[0026] The described type of preform has proven particularly well-suited for use in a process according to the invention. A preform composed of at least two sections, the first section being made of a blow-moldable plastic and the second section of a dimensionally stable plastic, ideally possesses all the features necessary to obtain a desired combination of features in the dispenser container, which consists of an outer container and an inner container. The expansion of the preform within a dimensionally stable outer container can be carried out in a particularly simple and advantageous manner by stretch blow molding.

[0027] Particularly advantageous are embodiments in which the inner container body formed from the blow-molded plastic has a lower dimensional stability compared to the inner container dispensing section formed from the dimensionally stable plastic and is designed to be deformable under the influence of force.

[0028] The stretch blow molding process is particularly preferably carried out using a stretch blow molding mandrel. In step d1) of the process for producing a dispenser container, a stretch blow molding mandrel is inserted into the preform, wherein the insertion of the stretch blow molding mandrel into the preform takes place before or after the insertion of the preform into the outer container.

[0029] The outer container provided in the method according to the invention is made of a dimensionally stable material. The dimensionally stable material of the outer container is preferably glass, plastic, metal, in particular aluminum, a metal alloy, sheet metal, or a composite material. For the purposes of the present invention, "dimensionally stable" means that a corresponding outer container does not deform, or only deforms to a negligible extent, under the pressures and / or vacuums occurring during the use of the dispenser container.

[0030] Particularly preferred are metallic materials commonly used for hairspray cans, such as aluminum. These materials possess the necessary dimensional stability and can be easily machined. For example, fitting a filling valve in the base of a metallic outer container is easily accomplished.

[0031] The blow-moldable plastic of the inner container body is preferably a thermoplastic, in particular a polyamide, a polyolefin, or a polycarbonate. Polyethylene terephthalate, polyvinyl chloride, polyethylene, or polypropylene are especially preferred. These materials exhibit particularly advantageous properties with regard to melting temperature and viscosity and are particularly well-suited for blow molding processes.

[0032] Preferably, the blow-molded plastic of the inner container body and the dimensionally stable plastic of the inner container dispensing section have different viscosities and / or melting temperatures. This allows a wide range of plastics to be combined. The plastic of the inner container body can be adapted to the requirements of the product stored within it.

[0033] According to a further particularly preferred embodiment of the present invention, the dimensionally stable plastic used in the method for manufacturing a dispenser container for the inner container dispensing section has a higher melting point than the blow-moldable plastic of the inner container body. This particularly well fulfills the properties desired for expanding the preform. A temperature can be set at which the plastic of the inner container body already melts and has a low viscosity, while the dimensionally stable plastic of the inner container dispensing section remains unchanged. The expansion of the preform to form the inner container body can then proceed without difficulty.

[0034] After carrying out step e1) of the inventive method for producing a dispenser container, the dispenser container is cooled, the stretch blow molding device is removed and the dispenser container can be used directly in the inventive method for producing a filled dispenser container and equipped with filling material.

[0035] From a technical perspective, there is a fluid transition between the terms "inner container" and "preform" used in this text. In the manufacturing process, a preform is first inserted into the outer container, which is then formed into an inner container through a stretch blow molding process. Depending on the progress of the stretch blow molding process, at a certain point it can still be referred to as a preform or already as an inner container.

[0036] The outer container used in the inventive method has a closable opening in its base. In the inventive method for producing a filled dispenser container, this opening, when open, serves to partially fill the interior of the outer container with a pressurized blowing agent. This opening in the base of the outer container fulfills a further function during the stretch blow molding process for forming the inner container. Stretch blow molding occurs by displacing some of the air contained in the interior of the outer container. This air can escape into the environment through the opening in the base of the outer container.According to a preferred embodiment of the present invention, therefore, in step e1) stretch blowing takes place while displacing a part of the air contained in the interior of the outer container, whereby the air escapes into the environment via the closable opening arranged in the bottom of the outer container.

[0037] Particularly preferably, in step e1), stretch blow molding and pressurizing the interior of the outer container with a medium to generate back pressure are carried out until the inner container fills between 50% and 90%, preferably between 66% and 75%, of the volume of the inner container. This embodiment ideally ensures that, on the one hand, the inner container has a comparatively large volume to accommodate a corresponding quantity of material, and on the other hand, that sufficient blowing agent is present in the interior of the outer container to exert sufficient pressure on the inner container until all the material is removed.The proportion of the volume of the outer container that is occupied by the inner container depends, as explained in more detail below, on the blow-moldable material of the inner container body, which in turn is chosen to suit the filling material that is to be received by the dispenser container.

[0038] The present invention also includes a method for manufacturing a filled dispenser container comprising the steps of: a2) Providing an unfilled dispenser container produced according to one of the methods described above, b2) Introducing a fill material through the dispensing opening of the inner container dispensing section into the inner container, c2) Introducing a pressurized propellant through a perforation in the outer container bottom into a portion of the outer container interior, wherein the portion of the outer container interior filled with the pressurized propellant is adjacent to the inner container body and the propellant exerts pressure on the inner container body, d2) Closing the opening in the outer container bottom with a closing device.

[0039] All the advantages discussed above in connection with the method for producing an unfilled dispenser container also arise in connection with the inventive method for producing a filled dispenser container, since in step a2) an unfilled dispenser container produced according to the methods described above is provided. To avoid repetition, reference is made to the above statements. The same applies to the preferred embodiments described in connection with the method for producing the unfilled dispenser containers.

[0040] A filled dispenser container produced by carrying out the inventive method for manufacturing a filled dispenser container comprises an outer container made of a dimensionally stable material and an inner container arranged inside the outer container. The outer container has an outer container base, an outer container body, and an outer container head with an outer container opening. The outer container base, outer container body, and outer container head define an inner space within the outer container.

[0041] The inner container preferably comprises an inner container body and an inner container dispensing section arranged in the area of ​​the outer container head, the dispensing section having a dispensing opening. The inner container dispensing section is made of a dimensionally stable plastic, and the inner container body is made of a blow-molded plastic. Preferably, the inner container body has lower dimensional stability compared to the inner container dispensing section and is designed to be deformable under the influence of force.

[0042] According to the inventive method for producing a filled dispenser container, the inner body of the dispenser container is filled with a product. A portion of the outer container's interior is filled with a pressurized propellant, which exerts pressure on the inner container body. The opening in the bottom of the outer container is closed with a closing device.

[0043] The filling material can be any substance with a sufficiently low viscosity for the dispensing process. Pastes, creams, gels, and liquids are preferred as filling materials.

[0044] In step c2) of the method according to the invention, a pressurized propellant is introduced into a partial region of the interior of the outer container through a perforation in the outer container base. It should be explicitly clarified that the term "partial region" refers both to a region adjacent to the outer container base, i.e., a region between the outer container base and the inner container body, and to a region between the outer container body and the inner container body. The pressurized propellant can spread between the outer container body and the inner container body, i.e., along the inner wall of the outer container body in the direction of the outer container head.In principle, a situation is conceivable in which, after the dispenser container has been filled with propellant and contents, the majority of the propellant is located between the outer container body and the inner container body, and only a small amount of propellant remains between the bottom of the outer container and the inner container body.

[0045] As a rule, the propellant exerts pressure on the inner container from all sides. This is one possible explanation for the fact that, in the dispenser container manufactured according to the invention, the propellant only needs to exert a significantly lower pressure compared to prior art solutions with pistons to achieve the same effect when dispensing the contents. This results in further cost savings.

[0046] Furthermore, a dispenser container manufactured according to the inventive method enables virtually complete removal of the contents. As already mentioned, the pressurized propellant is in direct contact with the inner container, whereby the pressure of the propellant is transmitted directly to the contents via the wall of the inner container. Since the inner container is made of blow-molded plastic, has lower dimensional stability compared to the dispensing section, and is designed to be deformable under force, the inner container collapses and reduces its volume as the contents are removed. The described direct transmission of pressure to the contents therefore occurs throughout the entire dispensing process, even when only small amounts of contents remain in the inner container.This results in the almost complete removal of the contents from the dispenser container.

[0047] Preferably, the dispensing opening of the inner container dispensing section, and thus also the outer container opening, is sealed with a sealing device. A dispensing valve is particularly preferred as the sealing device. The dispensing valve is installed after the contents have been introduced into the inner container through the dispensing opening of the inner container dispensing section. As already described, the area filled with the pressurized propellant borders the inner container body. The propellant is therefore in direct contact with the inner container body and exerts pressure on it. When a dispensing valve is used, this pressure results in the immediate and trouble-free dispensing of the contents from the dispenser container. Controlling the dispensing of the contents is easily achieved, as the dispensing valve can be actuated as needed and immediately interrupts the dispensing process.

[0048] For the purposes of this text, a propellant is understood to be both a gas and a substance that releases a gas as a result of a chemical reaction. A liquid can also be used as a propellant. According to a preferred embodiment of the present invention, the propellant is a gas, in particular nitrogen or air, or a liquid, in particular water. These preferred propellants are readily available, inexpensive, and easy to handle, and are in particular non-toxic and environmentally friendly.

[0049] According to another preferred embodiment, the closing means for the opening is a filling valve or a plug. When a plug is used, the opening is closed immediately after the propellant is introduced. However, a filling valve can also be installed in the opening before it is filled with propellant. In this case, the opening is temporarily closed before the propellant is introduced and opens in a known manner when a pressurized reservoir for the propellant is connected. Brief description of the drawings

[0050] The invention will be explained in more detail below with reference to exemplary embodiments in conjunction with the drawings. It is expressly pointed out that the invention is not limited to the examples given. The drawings show... Fig. 1A an external container in partial section; Fig. 1B a preform in perspective view from a slant above; Fig. 2 the outer container of Fig. 1A and inserted therein the preform of the Fig. 1B in perspective view from obliquely above in partial section; Fig. 3 a dispenser container with partially formed inner container body in perspective view from obliquely above in partial section; Fig. 4 a dispenser container with fully formed inner container body in perspective view from obliquely above in partial section; Fig. 5 the dispenser container of the Fig. 4 filled with propellant and sealed with a dispensing valve. Ways to implement the invention

[0051] The Fig. Figure 1A shows an outer container 2 made of dimensionally stable aluminum. The outer container 2 comprises an outer container base 4, an outer container body 5 and an outer container head 10 having an outer container opening 12. The outer container base 4, outer container body 5 and outer container head 10 define the inner space AIR of the outer container.

[0052] A closable opening 8 is arranged in the base of the outer container 4. When the opening 8 is open, the interior of the outer container AIR is in fluid communication with the environment. In its open state, the opening 8 can be used to fill the interior of the outer container AIR with a pressurized propellant.

[0053] The Fig. Figure 1B shows a preform 20 in perspective from a slightly oblique angle above. The preform 20 is used to manufacture an inner container 3 for a dispenser container 1, as shown below. Fig. The preform 20, as described in sections 2 to 5, is used. It has a cup-shaped body and is composed of two sections 20.1 and 20.2. The first section, 20.1, forms the closed end of the preform 20, while the second section, 20.2, forms the open end of the body 21. The closed end is opposite the open end.

[0054] The first section 20.1 is for the formation of the inner container body 6 (see Fig. 3 and Fig. 4) and the second section 20.2 is for the formation of the inner container dispensing section 7 (see Fig. 3 and Fig. 4) provided. The first section 20.1 consists of a blow-moldable plastic, in this case polyethylene, while the second section 20.2 consists of a dimensionally stable plastic, in this case a cross-linked polyurethane.

[0055] The upper end, i.e., the end of the inner container dispensing section 7 facing away from the first section 20.1 (see Fig. 3 and Fig. 4) The intended dispensing opening is marked with reference numeral 11.

[0056] In a method according to the invention for manufacturing a dispenser container 1, the materials associated with the Fig. 1A described outer container 2 and a preform 20 were provided, the properties and characteristics of which are related to the Fig. 1B already discussed. The preform 20 is heated to a temperature sufficient for a stretch blow molding process and, as in Fig. 2 shown, placed in the outer container 2. In addition, a container is placed in the Fig. 2 stretch blow mandrels (not shown) are inserted into the preform 20, wherein the insertion of the stretch blow mandrel into the preform 20 can take place before or after the insertion of the preform 20 into the outer container 2.

[0057] A stretch blow molding process is then carried out to form an inner container 3, whereby the flow of the introduced gas in the Fig. 2 is symbolized by a vertically running dashed arrow PD. The inner container 3 is formed by the stretch blow molding process. By blowing in the gas, e.g., air, the first section 20.1, which consists of the blow-moldable plastic polyethylene, expands, which in the Fig. 2 is indicated by several arrows, and in this way forms the inner container body 6. During the expansion of the first section 20.1, some of the air contained in the outer container interior AIR is displaced.

[0058] This air can escape into the environment through the unsealed opening 8 located in the bottom of the outer container 4.

[0059] At a predetermined time, the interior of the outer container AIR is pressurized with a medium to generate a back pressure PG via the opening 8 located in the bottom of the outer container 4. In the Fig. In section 3, this is symbolized by a vertically running dashed arrow PG. This counter-pressure in the direction of PG increasingly compensates for the pressure applied in the inner container body 6 in the direction of PD by the stretch blow molding process, and the stretch blow molding process is finally stopped at a defined point in time. This results in the formation of the inner container body 6 with a specific, predetermined inner container volume.

[0060] In the Fig. In the dispenser container 1 shown in section 4, this specific, predetermined inner container body volume is approximately 75% of the volume of the outer container interior AIR. It should be noted that the inner container body 6 in the Fig. 3 as well as in Fig. Figure 4 is shown in an idealized manner. The inner container body 6 can also be spaced away from the outer container body 5 over its entire extent or over part of its extent. In this case, the inner container body 6 extends closer to the bottom of the outer container 4.

[0061] In the Fig. Figure 4 shows the inner container 3, formed as described, next to the outer container 2. The inner container 3 has an inner container body 6 and an inner container dispensing section 7, located in the area of ​​the outer container head 10 and having a dispensing opening 11. The inner container dispensing section 7 is made of cross-linked polyurethane, a dimensionally stable plastic. The inner container body 6 is made of blow-molded polyethylene. The inner container body 6 has lower dimensional stability compared to the inner container dispensing section 7 and can be deformed under force.

[0062] In a method according to the invention for producing a filled dispenser container 1, a [something] associated with the Fig. 4. Dispenser container 1 is provided as described. As in Fig. As shown in Figure 4, to fill the dispenser container 1, the fill material F, for example a cream, is poured into the inner container 3 through the dispensing opening 11 of the inner container dispensing section 7.

[0063] Subsequently, a propellant 9, e.g. air, is introduced into the inner space AIR of the outer container through the opening 8 in the bottom of the outer container 4 (see Fig. 5) In the case shown, this fills the area 13 of the outer container interior AIR, adjacent to the outer container base 4, with the pressurized propellant 9.

[0064] The opening 8 in the bottom of the outer container 4 is closed with a closing device 15, e.g., a plug. A filling valve can also be installed in the opening 8 before filling with propellant 9. In this case, the opening 8 is temporarily closed before the propellant 9 is introduced and opens in a known manner when a pressurized reservoir for the propellant is connected.

[0065] In Fig. 5 is the dispensing opening of the inner container dispensing section 7 and simultaneously the outer container opening 12 is closed with a dispensing valve 16. The dispensing valve 16 is attached after the filling material F has been introduced through the dispensing opening 11 of the inner container dispensing section 7 into the inner container 3.

[0066] As also from Fig.As can be seen from Figure 5, the area filled with the pressurized propellant 9 borders the inner container body 6. The propellant 9 is therefore in direct contact with the inner container body 6 and exerts pressure on it. When the dispensing valve 16 is opened, this pressure leads to an immediate, trouble-free dispensing of the contents F from the dispenser container 1. Reference symbol list 1 dispenser container 2 external containers 3 inner containers 4 Outer container floor 5 outer container bodies 6 inner container bodies 7 Inner container dispensing section 8 Breakthrough 9 propellants 10 Outer container head 11 Opening 12 Outer container opening 13 Sub-area 15 locking devices 16 sealing agents 20 preforms 20.1 first section of the molded body 20.2 second section of the molded body AIR outer container interior F Filling material PG back pressure

Claims

[1] Method for manufacturing a dispenser container (1) comprising the steps: a1) Providing an outer container (2) formed from a dimensionally stable material, wherein the outer container (2) has an outer container base (4), an outer container body (5) and an outer container head (10) having an outer container opening (12), wherein the outer container base (4), outer container body (5) and outer container head (10) define an outer container interior (AIR), wherein the outer container base (4) has a closable opening (8), b1) Providing a preform (20) wherein the preform (20) consists at least partially of a blow-moldable plastic, c1) Heating the preform (20), d1) Inserting the preform (20) into the outer container (2), e1) Stretching of the preform (20) and impingement of the outer container interior (AIR) via the opening (8) arranged in the outer container base (4) with a medium to generate a counter pressure (PG) to form an inner container body (6) with a predetermined inner container body volume. [2] Method for manufacturing a dispenser container (1) according to claim 1, wherein the preform (20) provided in step b1) has a cup-shaped molded body composed of at least two sections (20.1, 20.2), wherein a first section (20.1) forms a closed end of the molded body and a second section (20.2) forms an open end of the molded body, the closed end being opposite the open end, wherein the first section (20.1) is provided for forming an inner container body (6) and the second section (20.2) is provided for forming an inner container dispensing section (7) arranged in the region of the outer container head (10) and having a dispensing opening (11), wherein the first section (20.1) is made of a blow-moldable plastic, and wherein the second section (20.2) is made of a dimensionally stable plastic. [3] Method for producing a dispenser container (1) according to claim 1 or 2, wherein step d1) comprises inserting a stretch blow mandrel into the preform (20), wherein the insertion of the stretch blow mandrel into the preform (20) takes place before or after the insertion of the preform (20) into the outer container (2). [4] Method for manufacturing a dispenser container (1) according to claim 2 or 3, wherein the inner container body (6) formed from the blow-molded plastic has a lower dimensional stability compared to the inner container dispensing section (7) formed from the dimensionally stable plastic and is designed to be deformable under the influence of force. [5] Method for manufacturing a dispenser container (1) according to any one of claims 1 to 4, wherein in step e1) stretch blow molding is carried out by displacing a part of the air contained in the inner space (AIR) of the outer container, the air escaping into the environment via the closable opening (8) arranged in the bottom of the outer container (4). [6] Method for producing a dispenser container (1) according to any one of claims 1 to 5, wherein in step e1) stretch blow molding and the application of a medium to generate a counter pressure (PG) to the inner container (3) are carried out until the inner container (3) fills between 50% and 90%, preferably between 66% and 75%, of the volume of the inner container (AIR). [7] Method for manufacturing a dispenser container (1) according to any one of claims 1 to 6, wherein the dimensionally stable material of the outer container (2) is glass, plastic, metal, in particular aluminium, a metal alloy, sheet metal or a composite material. [8] Method for manufacturing a dispenser container (1) according to any one of claims 1 to 7, wherein the blow-moldable plastic of the inner container body (6) is a thermoplastic plastic, in particular a polyamide, a polyolefin or a polycarbonate, in particular preferably polyethylene terephthalate, polyvinyl chloride, polyethylene or polypropylene. [9] Method for manufacturing a dispenser container (1) according to any one of claims 2 to 8, wherein the dimensionally stable plastic of the inner container dispensing section (7) has a higher melting temperature than the blow-moldable plastic of the inner container body (6). [10] Method for producing a filled dispenser container (1) comprising the steps: a2) Providing a dispenser container (1) manufactured according to a method according to claims 1 to 9, b2) Introducing a filling material (F) through the dispensing opening (11) of the inner container dispensing section (7) into the inner container body (6), c2) Introducing a pressurised propellant (9) through the opening (8) of the outer container bottom (4) into a partial area (13) of the outer container interior (AIR), wherein the partial area (13) of the outer container interior (AIR) filled with the pressurised propellant (9) is adjacent to the inner container body (6) and the propellant (9) exerts a pressure on the inner container body (6), d2) Closing the opening (8) of the outer container bottom (4) with a closing device (15). [11] Method for producing a filled dispenser container (1) according to claim 10, wherein the filling material (F) is a paste, a cream, a gel or a liquid. [12] Method for producing a filled dispenser container (1) according to claim 10 or 11, wherein after step b2) the step e2) The dispensing opening (11) of the inner container dispensing section (7) and the outer container opening (12) is closed with a closing means (16), preferably with a dispensing valve (16). [13] Method for producing a filled dispenser container (1) according to one of claims 10 to 12, wherein the propellant (9) is a gas, in particular nitrogen or air, or a liquid, in particular water. [14] Method for producing a filled dispenser container (1) according to any one of claims 10 to 13, wherein the closing means (15) closing the opening (8) is a filling valve or a plug.

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