Dispenser container, preform for producing a dispenser container, method for producing a dispenser container
Patent Information
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- INOTECH KUNSTOFFTECHNIK GMBH
- Filing Date
- 2024-08-01
- Publication Date
- 2026-04-29
Smart Images
Figure EP2024071908_27022025_PF_FP_ABST
Abstract
Description
[0001] Dispensing container, preform for producing a dispenser container, method for producing a dispenser container
[0002] Technical area
[0003] The present invention relates to a dispenser container with an outer container and an inner container for holding a filling material.
[0004] State of the art
[0005] Dispenser containers with an outer and an inner container are known in various designs from the prior art. The contents of the dispenser containers are always contained in the respective inner container.
[0006] For example, dispenser containers are known that consist of an elastically deformable outer container and a plastically deformable inner container arranged within this outer container. The rigidity of the outer container is selected such that after the outer container is compressed, it returns to its original shape. The inner container is made of a plastically deformable material, so that it collapses almost completely under pressure and can therefore be easily emptied. To ensure that the outer container retains its aesthetically pleasing appearance, pressure equalization must be ensured in the space between the outer and inner containers.
[0007] In this context, DE 40 27 539 A1, for example, describes a squeeze bottle with a substantially rigid, yet elastically deformable outer container, within which a readily deformable inner container is arranged. A closure seals the space between the inner and outer containers. The closure has a sealing lip through which air can flow into the space between the inner and outer containers once the squeezing process of the tube contents is complete. This ensures that the outer container returns to its original shape.
[0008] With an alternative type of dispenser container, the dispensing process does not occur by squeezing the container, but by creating a vacuum in the container with the help of a pump and a suction tube reaching into the contents. This type of dispenser container makes it possible to use outer containers made of a dimensionally stable material. It has been shown that an outer container made of a dimensionally stable material, such as glass in particular, is perceived by many consumers as being of higher quality than an outer container made of a deformable material, so that products offered in such a glass container often sell better than the same products in a deformable plastic container. This type of dispenser container, as described by way of example in DE 10 2019 120 624 A1, is used, for example, for the metered dispensing of cosmetic or medical products in fluid form.
[0009] US 2012 / 0279995 A1 discloses a dispensing device comprising a housing surrounding a compressible container. Attached to the compressible container is a tab that is received in a corresponding first recess in a wall of the housing. The dispensing device dispenses material through an open end of the container in response to a compressive force. When the container is compressed, the tab leaves the first recess and engages a second recess located closer to the dispensing end of the housing than the first recess.
[0010] DE 10 2014 113 535 A1 also describes a dispenser container consisting of an outer container and an inner container. In this case, the outer container and inner container are made of two different, bias-molded plastics, whereby the two plastics do not form a material bond with each other. The plastic from which the inner container is formed has greater elasticity than the plastic from which the outer container is formed, so that the inner container is deformed by a negative pressure acting on it, while the outer container remains dimensionally stable. The outer container has a pressure equalization opening for ventilating the space between the outer container and the inner container.
[0011] The dispenser container of DE 10 2014 113 535 A1 is manufactured using an injection blow molding process, whereby a preform is first produced. To form the preform, a first layer is injected onto an injection blow molding core located in a first cavity of a multi-component injection molding device. The inner container of the dispenser container is subsequently formed from this first layer. The injection blow molding core, with the first layer on it, is then introduced into a second cavity. A second layer is then injected onto the injection blow molding core located in the second cavity of the multi-component injection molding device. The outer container of the dispenser container is subsequently formed from this second layer.In a further process step, the preform is brought to the temperature required for stretch blow molding, introduced into a stretch blow molding device, and there expanded into the desired dispensing container with a flexible inner container and a dimensionally stable outer container. A dispensing container similar to the dispensing container of DE 10 2014 113 535 A1 is known from DE 10 2017 121 702 A1. The dispensing container consists of an outer container and an inner container for holding a fluid, wherein the outer container and inner container are formed from bias-molded plastics that do not form a material bond with one another. A first plastic, from which the inner container is formed, has a higher elasticity than a second plastic, from which the outer container is formed, such that the inner container is deformable. The outer container has at least one pressure equalization opening for pressure equalization in the area between the outer container and inner container.The outer surface of the inner container has a projection that extends into the pressure equalization opening and closes it. By moving the mouth area of the inner container relative to the mouth area of the outer container, the projection is released from the pressure equalization opening and moved in the direction of the mouth. The pressure equalization opening is then opened, ensuring ventilation of the area between the outer container and the inner container.
[0012] Despite these different approaches to the solution, there is still a need for dispenser containers with an outer and inner container, in which pressure equalization in the space between the outer and inner containers can be ensured by a concept that is structurally simple and cost-effective to produce.
[0013] Description of the invention
[0014] The invention, as characterized in the claims, is based on the object of providing a dispenser container in which the space between a plastic inner container and a dimensionally stable outer container can be ventilated in a simple and cost-effective manner in the production of the dispenser container.
[0015] This object is achieved according to the invention by the dispenser container according to claim 1, the pump dispenser according to claim 6, the preform for producing a dispenser container according to claim 7 and the method for producing a dispenser container according to claim 10. Further advantageous details, aspects and embodiments of the present invention emerge from the dependent claims, the description, the examples and the drawings.
[0016] The dispensing container according to the invention has an outer container and an inner container arranged within the outer container for receiving a filling material. The outer container has an outer container body, an outer container shoulder, and an outer container nipple having an outer container opening, wherein the outer container is formed from a bias-formed, dimensionally stable plastic and the outer container shoulder has an outer container shoulder layer thickness AD. The inner container has an inner container body arranged in the region of the outer container body, an inner container shoulder arranged in the region of the outer container shoulder, and an inner container dispensing section arranged in the region of the outer container nipple and having a dispensing opening. The inner container is formed from a bias-formed, plastic plastic and the inner container shoulder has an inner container shoulder layer thickness.The inner container shoulder has at least one pressure transmission region, wherein the pressure transmission region has a pressure transmission region layer thickness increased by at least the outer container shoulder layer thickness. The outer container shoulder has at least one opening, wherein the at least one pressure transmission region of the inner container shoulder penetrates the at least one opening and the pressure transmission region bears sealingly against a circumferential edge region of the opening.
[0017] The dispenser container according to the invention has at least one opening in the region of the outer container shoulder. The inner container body and the inner container shoulder are formed from a bias-molded, plastic material, with at least one region being provided in the region of the inner container shoulder that has a layer thickness (pressure transmission region layer thickness) that is increased compared to the layer thickness of the remaining inner container shoulder (inner container shoulder layer thickness). This region (pressure transmission region), with a layer thickness increased by at least the layer thickness of the outer container shoulder (outer container shoulder layer thickness), penetrates the at least one opening provided in the outer container shoulder.As described in more detail below, this makes it possible to establish a fluid connection between the environment and the space between the inner container and the outer container in a simple and safe manner, thus ensuring the ventilation of this space.
[0018] In the dispenser container according to the invention, the pressure transmission area lies sealingly against the circumferential edge area of the opening in the outer container. The space between the inner container and the outer container is thus sealed from the environment. By attaching a pump head, which is screwed onto the dispenser container nipple, secured by a bayonet lock, or vertically pressed on, the pressure transmission area is partially deformed and also at least partially pressed into the outer container body. A gap is created between the edge of the opening in the outer container shoulder and the pressure transmission area arranged in the area of the inner container shoulder. This creates a fluid connection between the environment and the space between the inner container and the outer container, and this space is ventilated.The inner container, made of a plastically deformable material, is thus exposed to atmospheric pressure, so that after the contents have been removed it collapses almost completely and can therefore be easily emptied.
[0019] This allows for particularly simple and cost-effective venting of the space between the plastic inner container and the rigid outer container. Furthermore, it has been shown that venting in the shoulder area of the dispenser container is significantly more effective and reproducible than with prior art solutions, which provide vent openings in the area of the dispenser container base or on the dispenser container nipple.
[0020] For the purposes of the present invention, "dimensionally stable" means that a corresponding outer container or a corresponding plastic does not deform, or only deforms to a negligibly small extent, under the pressures and / or negative pressures occurring during use of the dispenser container.
[0021] The dispenser container according to the invention consists of an outer container and an inner container, with both the outer container and the inner container being made of bias-molded plastics. The plastics used to form the outer container and the inner container do not form a material bond with each other, so the blow-molding process creates an inner container that initially rests against the inner wall of the outer container. However, after the contents are removed and the space between the inner and outer containers is ventilated, it detaches from the inner wall of the outer container and collapses.
[0022] The filling material can be any substance with a sufficiently low viscosity for the dispensing process. Pastes, creams, gels, and liquids are preferred.
[0023] According to a preferred embodiment, the inner container shoulder has a plurality of pressure transmission areas, and the outer container shoulder has a plurality of openings, wherein a pressure transmission area of the inner container shoulder penetrates a opening in the outer container shoulder and sealingly rests against the peripheral edge area of the respective opening. When the pump head is attached, all pressure transmission areas are at least partially pressed into the outer container body and partially deformed. Advantageously, the openings and the pressure transmission areas can be arranged symmetrically to the outer container nipple in this case, whereby the ventilation of the space between the inner container and the outer container occurs evenly over the entire circumference of the outer container shoulder. Ventilation is thus even more effective and reproducible.
[0024] The outer container nipple is preferably equipped with an external thread. A pumping device of any design can be screwed onto the external thread to remove the contents of the inner container. Alternatively, the pumping device can also be attached using a bayonet lock.
[0025] The plastic of the inner container is preferably a thermoplastic, in particular a polyamide, a polyolefin, or a polycarbonate. Polyethylene terephthalate, polyvinyl chloride, polyethylene, or polypropylene are particularly preferred. These materials have particularly advantageous properties with regard to melting temperature and viscosity and are particularly well suited for blow molding processes. Furthermore, these plastics exhibit good chemical resistance, thereby expanding the range of contents that can be stored in the inner container.
[0026] According to a particularly preferred embodiment of the present invention, the pressure transmission region layer thickness is at least 5 times, preferably at least 10 times, particularly preferably at least 20 times the inner container shoulder layer thickness. According to the invention, the pressure transmission region has a layer thickness increased by at least the layer thickness of the outer container shoulder (outer container shoulder layer thickness), since the pressure transmission region penetrates the opening provided in the outer container shoulder. Compared to the relatively small layer thickness of the inner container and in particular compared to the relatively small layer thickness of the inner container shoulder, it has proven advantageous if the pressure transmission region layer thickness is at least 5 times, preferably at least 10 times, particularly preferably at least 20 times the inner container shoulder layer thickness.This ensures that the pressure transmission area penetrates the opening in the outer container shoulder to a sufficient extent and that the projection provided on a pump head, which is described in more detail below, can come into active connection with the pressure transmission area in a safe and reproducible manner.
[0027] Preferably, the dimensionally stable plastic of the outer container and the plastic plastic of the inner container body have different viscosities and / or melting points. This allows a wide range of plastics to be combined with one another. The plastic of the inner container body can be adapted to the requirements of the contents stored therein. The present invention also encompasses a pump dispenser, wherein the pump dispenser comprises one of the dispenser containers described above and a pump head. The pump head can be any pump device of any design known to those skilled in the art, which is attached to the outer container nipple having the outer container opening for removing the contents present in the inner container.The pump head only needs to have at least one projection on its underside facing the dispenser container, which projection, when the pump head is attached to the dispenser container, comes into operative connection with the at least one pressure transmission region of the inner container shoulder in such a way that the pressure transmission region is moved at least partially into the outer container body, thus establishing a fluid connection from the environment to the space located between the inner container and the outer container.
[0028] The projection on the underside of the pump head can be curved, hollow-cylindrical, and extend around the entire circumference of the pump head. If multiple openings and pressure transmission areas are provided distributed around the circumference of the outer container shoulder, this ensures that the hollow-cylindrical projection of the pump head interacts with all pressure transmission areas, and this interaction occurs essentially simultaneously. The interaction with the pressure transmission area can be achieved particularly reliably and reproducibly if the projection is chamfered on its underside.
[0029] As already described, in the dispenser container according to the invention, the respective pressure transmission area lies sealingly against the circumferential edge area of the corresponding opening in the outer container. The space between the inner container and the outer container in the dispenser container is thus sealed from the environment. When the pump head is attached, which is screwed onto the dispenser container nipple, crimped on in a directed manner, or attached using a bayonet lock, the projection(s) come into operative connection with the pressure transmission area(s), and the pressure transmission area(s) is / are pressed at least partially into the outer container body. This creates a gap between the edge of the opening in the outer container shoulder provided in the outer container and the pressure transmission area arranged in the region of the inner container shoulder.This creates a fluid connection between the environment and the space between the inner and outer containers, and ventilates this space. The inner container, made of a plastically deformable material, is thus exposed to atmospheric pressure, allowing it to collapse almost completely after the contents are removed, making it easy to empty.
[0030] A particular advantage of the pump dispenser according to the invention lies in the fact that the pump head can be removed and reused after the contents have been completely removed from the dispenser container. This essentially halves the amount of plastic waste generated after use of a pump dispenser.
[0031] The present invention also encompasses a preform for producing one of the dispensing containers described above. The preform has a cup-like shape and consists of an inner layer and an outer layer, wherein the inner layer consists of a blow-moldable plastic and is intended to form a plastic inner container, and the outer layer is intended to form a dimensionally stable outer container. The inner layer is constructed from at least three sections, wherein a first section forms a closed end of the preform, a third section forms an open end of the preform opposite the closed end, and a second section is arranged between the first section and the third section.The first section is provided to form an inner container body, the second section is provided to form an inner container shoulder, and the third section is provided to form an inner container dispensing section having a dispensing opening. The second section of the inner layer has at least one region with increased layer thickness, provided to form a pressure transmission region. The outer layer has a recess in the region provided to form a pressure transmission region.
[0032] The preform serves to produce a dispenser container according to the invention. The preform has all the features required to obtain the corresponding combination of features of the dispenser container consisting of an outer container and an inner container. Expanding the preform results in the dispenser container according to the invention. All the advantages discussed above in connection with the dispenser container and the outer container and inner container components forming such a dispenser container also arise in connection with the preform according to the invention. The same applies to the preferred embodiments of the preform specified below.
[0033] Preferably, the second section of the preform, which is intended to form the inner container shoulder, has a plurality of regions with increased layer thickness provided for the formation of pressure transmission regions. In this case, the outer layer has a corresponding number of recesses in the regions provided for the formation of the pressure transmission regions. After the dispensing container has been formed by stretch blow molding of the preform, a pressure transmission region of the inner container shoulder penetrates an opening in the outer container shoulder and lies sealingly against the circumferential edge region of the respective opening. Advantageously, the pressure transmission regions are arranged symmetrically to the inner container dispensing section, whereby the ventilation of the space between the inner container and the outer container takes place uniformly over the entire circumference of the outer container shoulder.
[0034] The blow-moldable plastic of the inner layer of the preform is preferably a thermoplastic, in particular a polyamide, a polyolefin, or a polycarbonate. Polyethylene terephthalate, polyvinyl chloride, polyethylene, and polypropylene are particularly preferred.
[0035] The production of one of the preforms described above is known to the person skilled in the art and is described in detail in DE 10 2014 113 535 A1. In this respect, reference is made to DE 10 2014 113 535 A1 and its disclosure in connection with the production of a preform is made part of the present text. To form the preform, in a first step, a first layer is sprayed onto an injection-molded core located in a first cavity of a multi-component injection molding device. The inner container of the dispenser container is subsequently formed from this first layer. The injection-molded core, with the first layer located thereon, is then introduced into a second cavity. A second layer is then sprayed onto the injection-molded core located in the second cavity of the multi-component injection molding device. The outer container of the dispenser container is subsequently formed from this second layer.
[0036] The present invention further encompasses a method for producing one of the dispenser containers described above. The method comprises the steps: a) providing one of the preforms described above, b) heating the preform, c) introducing the preform into a stretch blow molding device, d) stretch blow molding to form a dispenser container with an inner container and an outer container, wherein the at least one pressure transmission region of the inner container shoulder penetrates the at least one opening in the outer container shoulder, and the pressure transmission region bears sealingly against the peripheral edge region of the opening.
[0037] In a process for producing a dispensing container, a preform is first prepared. The preform is heated to a temperature sufficient for stretch blow molding and introduced into a stretch blow molding machine. A stretch blow molding process is then performed, forming the dispensing container with a plastic inner container and a dimensionally stable outer container. The areas of increased layer thickness of the preform, intended to form a pressure transfer zone, form the pressure transfer zones, which penetrate the corresponding openings in the outer container shoulder and form a sealing contact with the peripheral edge areas of the openings.
[0038] The dispenser container is then cooled, removed from the stretch blow molding device and can be immediately filled with the product.
[0039] Short description of the drawings
[0040] The invention will be explained in more detail below using exemplary embodiments in conjunction with the drawings. It is expressly pointed out that the invention is not intended to be limited to the given examples.
[0041] Fig. 1 shows a dispenser container according to the invention with a pump head in a perspective view;
[0042] Fig. 2 shows a section of the dispenser container according to Fig. 1 in a perspective view;
[0043] Fig. 3 shows a dispenser container according to the invention with a pump head in section;
[0044] Fig. 4 shows a section of another embodiment of a dispenser container according to the invention in a perspective view.
[0045] Ways to implement the invention
[0046] Figure 1 shows a perspective view of a dispenser container 1 according to the invention with a pump head 40. Figure 2 shows a section of the dispenser container according to Figure 1 in a perspective view. The dispenser container 1 comprises a bias-formed, dimensionally stable outer container 2 and a bias-formed, plastic inner container arranged within the outer container 2 and not visible in Figures 1 and 2. The inner container can hold a filling material.
[0047] The outer container 2 is constructed of an outer container body 5, an outer container shoulder 9, and an outer container nipple 10. The outer container nipple 10 is equipped with an external thread 15 on its outside. A pumping device 40 of any design for removing the contents can be screwed onto the external thread 15. The pumping device shown in Figure 1 is equipped with a closure cap.
[0048] The inner container has an inner container body 6 arranged in the region of the outer container body 5 and an inner container dispensing section 7 arranged in the region of the outer container nipple 10 and having a dispensing opening 11.
[0049] Two openings are provided in the area of the outer container shoulder 9. The inner container shoulder 14 has two pressure transmission areas 30.1, 30.2. The pressure transmission areas 30.1, 30.2 have a pressure transmission area layer thickness DD that exceeds the layer thickness of the inner container shoulder, i.e., the inner container shoulder layer thickness ID, by several times (see Figure 3). The pressure transmission area layer thickness DD is significantly greater than the outer container layer thickness AD, ensuring that the respective pressure transmission area penetrates the outer container shoulder.
[0050] The two pressure transmission areas 30.1, 30.2 are arranged symmetrically to the dispensing opening 11 of the inner container dispensing section 7. Each pressure transmission area penetrates an opening in the outer container shoulder 9 and forms a sealing seal against the peripheral edge area of the respective opening.
[0051] Figure 3 shows a sectional view of a dispenser container according to the invention with a pump head 40. The pump head 40 is equipped with a closure cap. The dispenser container comprises an outer container 2 and an inner container 3 arranged within the outer container 2.
[0052] The pump head 40 has two projections 41 on its underside facing the dispenser container. When the pump head 40 is attached to the dispenser container, in the illustrated embodiment when screwing an internal thread provided on the pump head 40 to the external thread 15 of the outer container nipple 10, the two projections 41 move in the direction of the arrows shown in Figure 3 and come into operative connection with the two pressure transmission areas 30.1, 30.2 of the inner container shoulder 14. As indicated by the two dashed lines, the two pressure transmission areas 30.1, 30.2 move partially into the outer container body 5. This creates a gap between the edge of the opening in the outer container shoulder 9 of the outer container 2 and the respective pressure transmission area 30.1, 30.2 arranged in the area of the inner container shoulder 14.This creates a fluid connection between the environment and the space located between the inner container 3 and the outer container 2, ensuring ventilation of this space. The inner container 3, made of a plastically deformable material, is thus exposed to atmospheric pressure, so that it collapses almost completely after the contents are removed and can therefore be easily emptied.
[0053] The inner container body 6 visible in Figure 3, as well as the inner container shoulder 14 and the inner container discharge section 7, is made of a bias-molded plastic. In the embodiment shown in Figure 3, the inner container 3 is made of polyethylene, and the outer container 2 is made of a cross-linked polyurethane.
[0054] As can be seen from Figure 3, the pressure transmission area layer thickness DD is significantly larger than the outer container layer thickness AD, which ensures that the respective pressure transmission area 30.1, 30.2 penetrates the outer container shoulder 9.
[0055] After the dispenser container 1 is formed by stretch blow molding a preform, a pressure transmission region 30.1, 30.2 of the inner container shoulder 14 penetrates an opening in the outer container shoulder 9 and sealingly abuts the peripheral edge region of the respective opening. The pressure transmission regions 30.1, 30.2 are arranged symmetrically to the inner container dispensing section 7, whereby the space between the inner container 3 and the outer container 2 is ventilated evenly over the entire circumference of the outer container shoulder 9.
[0056] Figure 4 shows a perspective view of a section of an alternative embodiment of a dispenser container 1 according to the invention. In contrast to the dispenser container shown in Figure 2, the outer container shoulder 9 of Figure 4 has six perforations, and correspondingly, the inner container shoulder has six pressure transmission areas penetrating the perforations. Five pressure transmission areas 30.1, 30.2, 30.3, 30.4, 30.5 are visible in Figure 4.
[0057] List of reference symbols
[0058] 1 dispenser container
[0059] 2 outer containers
[0060] 3 inner containers
[0061] 5 Outer container body
[0062] 6 inner container body
[0063] 7 Inner container dispensing section
[0064] 9 Outer container shoulder
[0065] 10 outer container nipples
[0066] 11 Dispensing opening
[0067] 14 Inner container shoulder
[0068] 15 external threads
[0069] 30.1, 30.2 Pressure transmission areas of the inner container
[0070] 30.3, 30.4 Pressure transmission areas of the inner container
[0071] 30.5 Pressure transmission area of the inner container
[0072] 30.1, 30.2 areas of the inner layer of the preform intended for the formation of pressure transfer areas
[0073] 30.3, 30.4 areas of the inner layer of the preform intended for the formation of pressure transfer areas
[0074] 30.5 Area of the inner layer of the preform intended to form a pressure transfer area
[0075] 40 pump head
[0076] 41 Pump head projection
Claims
Claims 1. Dispenser container (1) comprising an outer container (2) and an inner container (3) arranged within the outer container (2) for receiving a filling material, wherein the outer container (2) has an outer container body (5), an outer container shoulder (9) and an outer container nipple (10) having an outer container opening, wherein the outer container (2) is formed from a bias-formed, dimensionally stable plastic and the outer container shoulder (9) has an outer container shoulder layer thickness (AD), wherein the inner container (3) has an inner container body (6) arranged in the region of the outer container body (5), an inner container shoulder (14) arranged in the region of the outer container shoulder (9) and an inner container dispensing section (7) arranged in the region of the outer container nipple (10) and having a dispensing opening (11), wherein the inner container (3) is made from a bias-formed,plastic and the inner container shoulder (14) has an inner container shoulder layer thickness (ID), wherein the inner container shoulder (14) has at least one pressure transmission region (30.1), wherein the pressure transmission region has a pressure transmission region layer thickness (DD) increased at least by the outer container shoulder layer thickness (AD), wherein the outer container shoulder (9) has at least one opening and the at least one pressure transmission region (30.1) of the inner container shoulder (14) penetrates the at least one opening and the pressure transmission region (30.1) lies sealingly against a circumferential edge region of the opening.
2. Dispenser container (1) according to claim 1, characterized in that the inner container shoulder (14) has a plurality of pressure transmission areas (30.1, 30.2, 30.3, 30.4, 30.5) and the outer container shoulder (9) has a plurality of openings, wherein in each case a pressure transmission area (30.1, 30.2, 30.3, 30.4, 30.5) of the inner container shoulder (14) penetrates an opening in the outer container shoulder (9) and lies sealingly against the circumferential edge area of the respective opening.
3. Dispenser container (1) according to one of claims 1 or 2, characterized in that the outer container nipple (10) is equipped with an external thread (15).
4. Dispenser container (1) according to one of claims 1 to 3, characterized in that the plastic of the inner container (3) is a thermoplastic Plastic, in particular a polyamide, a polyolefin or a polycarbonate, particularly preferably polyethylene terephthalate, polyvinyl chloride, polyethylene or polypropylene.
5. Dispenser container (1) according to one of claims 1 to 4, characterized in that the pressure transmission area layer thickness (DD) is at least 5 times, preferably at least 10 times, particularly preferably at least 20 times the inner container shoulder layer thickness (ID).
6. Pump dispenser comprising a dispenser container (1) according to one of claims 1 to 5 and a pump head (40), wherein the pump head (40) has at least one projection (41) on its underside facing the dispenser container (1), wherein the at least one projection (41) can be brought into operative connection with the at least one pressure transmission region (30.1) of the inner container shoulder (14) by attaching the pump head (40) to the dispenser container (1) in such a way that the pressure transmission region (30.1) can be moved at least partially into the outer container body (5) and a fluid connection can be established from the environment to the space located between the inner container (3) and the outer container (2).
7. A preform for producing a dispenser container (1) according to one of claims 1 to 5, wherein the preform has a cup-like shape and the preform consists of an inner layer and an outer layer, wherein the inner layer consists of a blow-moldable plastic and is provided for forming a plastic inner container (3), and the outer layer is provided for forming a dimensionally stable outer container (2), wherein the inner layer is constructed of at least three sections, wherein a first section forms a closed end of the preform, a third section forms an open end of the preform opposite the closed end, and a second section is arranged between the first section and the third section, wherein the first section is provided for forming an inner container body (6), the second section is provided for forming an inner container shoulder (14),and the third section is provided for forming an inner container dispensing section (7) having a dispensing opening (11), wherein the second section of the inner layer has at least one region (30.1) with increased layer thickness provided for forming a pressure transmission region, wherein the outer layer has a recess in the region provided for forming a pressure transmission region (30.1).
8. Preform according to claim 7, characterized in that the second section has a plurality of regions with increased layer thickness provided for the formation of pressure transmission regions (30.1, 30.2, 30.3, 30.4, 30.5).
9. Preform according to one of claims 7 or 8, characterized in that the blow-moldable plastic of the inner layer is a thermoplastic plastic, in particular a polyamide, a polyolefin or a polycarbonate, particularly preferably polyethylene terephthalate, polyvinyl chloride, polyethylene or polypropylene.
10. A method for producing a dispenser container (1) according to one of claims 1 to 5, comprising the steps of: a) providing a preform according to one of claims 7 to 9, b) heating the preform, c) introducing the preform into a stretch blow molding device, d) stretch blow molding to form a dispenser container (1) with an inner container (3) and an outer container (2), wherein the at least one pressure transmission region (30.1) of the inner container shoulder (14) penetrates the at least one opening in the outer container shoulder (9) and the pressure transmission region (30.1) lies sealingly against the peripheral edge region of the opening.