阅读说明：本技术 具有内装部件的塑料容器 (Plastic container with built-in parts ) 是由 T.富克斯 A.普雷特勒 R.普赫莱特纳 于 2021-05-07 设计创作，主要内容包括：一种用于制造塑料容器的方法,其中,所述塑料容器包括容器壁(1),并且至少一个内装部件(2)固定在所述容器壁(1)上,其中,所述内装部件(2)具有固定面(3),该固定面具有从固定面(3)突出的保持几何形状(4),所述方法包括以下步骤:至少在一个固定区域内对容器壁(1)进行加热；将内装部件(2)的固定面(3)相对容器壁(1)的加热的固定区域挤压,其中,保持几何形状(4)在不穿透容器壁(1)的情况下进入容器壁(1)中,使得保持几何形状(4)的自由端部位于容器壁(1)的内部,其中,容器壁(1)的塑料位于保持几何形状(4)之间,使得在内装部件(2)的保持几何形状(4)和容器壁(1)的塑料之间存在形状配合,本发明还涉及一种相应的塑料容器。(A method for producing a plastic container, wherein the plastic container comprises a container wall (1) and at least one interior component (2) is fixed to the container wall (1), wherein the interior component (2) has a fixing face (3) with a retaining geometry (4) protruding from the fixing face (3), comprising the steps of heating the container wall (1) at least in one fixing region; the invention relates to a method for producing a plastic container, in which a fastening surface (3) of an interior part (2) is pressed against a heated fastening region of a container wall (1), wherein a retaining geometry (4) is introduced into the container wall (1) without penetrating the container wall (1) such that the free end of the retaining geometry (4) is located inside the container wall (1), wherein the plastic of the container wall (1) is located between the retaining geometries (4) such that a form fit exists between the retaining geometry (4) of the interior part (2) and the plastic of the container wall (1), and to a corresponding plastic container.)

1. A method for manufacturing a plastic container, wherein the plastic container comprises a container wall (1) and at least one interior component (2) is fixed to the container wall (1), wherein the interior component (2) has a fixing face (3) with a retaining geometry (4) protruding from the fixing face (3), the method comprising the steps of:

heating the container wall (1) at least in a fixed area;

pressing the fastening surface (3) of the interior component (2) against the heated fastening region of the container wall (1), wherein the retaining geometry (4) penetrates into the container wall (1) without penetrating the container wall (1) such that the free end of the retaining geometry (4) is located inside the container wall (1), wherein the plastic of the container wall (1) is located between the retaining geometries (4) in order to produce a form fit between the retaining geometry (4) of the interior component (2) and the plastic of the container wall (1).

2. Method according to claim 1, characterized in that the retaining geometry (4) forms an undercut and/or has form-fitting elements.

3. Method according to claim 1, characterized in that the retaining geometry (4) is designed in such a way that the heads (5) of the retaining geometry (4) are each connected to the fastening surface (3) via a base (6) of the retaining geometry (4) which has a smaller cross section than the heads (5) of the retaining geometry (4).

4. Method according to claim 1, characterized in that the retaining geometry (4) is designed as an inclined rib, arch, angle, hook or rectangular piece.

5. Method according to claim 1, characterized in that the retaining geometries (4) extend linearly in a direction perpendicular to an inclined, arched, angular, hook-shaped or otherwise undercut cross section, wherein preferably a plurality of linear retaining geometries (4) are arranged side by side in parallel.

6. Method according to claim 1, characterized in that the container wall (1) has a barrier layer (7) in a fixing region and in that the fixing face (3) of the interior component (2) is pressed against the heated fixing region of the container wall (1) in such a way that the retaining geometry (4) is located in front of the barrier layer (7), i.e. does not penetrate the barrier layer (7).

7. Method according to claim 1, characterized in that the fastening face (3) of the interior component (2) is pressed against the heated fastening region of the container wall (1) in such a way that the fastening face (3) of the interior component (2) lies on the fastening region of the container wall (1).

8. Method according to claim 1, characterized in that the fastening surface (3) of the interior component (2) is designed to be full-surface, i.e. without openings.

9. A plastic container, wherein the plastic container comprises a container wall (1) and at least one interior component (2) is fixed to the container wall (1), characterized in that the interior component (2) has a fixing face (3) with a retaining geometry (4) protruding from the fixing face (3), wherein the retaining geometry (4) enters the container wall (1) without penetrating the container wall (1) such that a free end of the retaining geometry (4) is located inside the container wall (1), wherein the plastic of the container wall (1) is located between the retaining geometries (4) in order to create a form fit between the retaining geometry (4) of the interior component (2) and the plastic of the container wall (1).

10. A plastic container according to claim 9, characterized in that the retaining geometry (4) forms an undercut and/or has form-fitting elements.

11. The plastic container according to claim 9, characterized in that the retaining geometry (4) is designed as an inclined rib, arch, angle, hook or rectangular piece, or the retaining geometry (4) is designed in such a way that the head (5) of the retaining geometry (4) is connected to the fastening face (3) by a base (6) of the retaining geometry (4), respectively, which base has a smaller cross section than the head (5) of the retaining geometry (4).

12. A plastic container according to claim 9, characterized in that the retaining geometries (4) extend linearly in a direction perpendicular to an inclined, arched, angular, hook-shaped or otherwise undercut cross section, wherein preferably a plurality of linear retaining geometries (4) are arranged side by side in parallel.

13. A plastic container according to claim 9, characterized in that the container wall (1) has a barrier layer (7) in the fixing area and the retaining geometry (4) is located in front of the barrier layer (7), i.e. does not penetrate the barrier layer (7).

14. A plastic container according to claim 9, characterized in that the fastening face (3) of the interior part (2) bears against a fastening region of the container wall (1).

15. The plastic container as claimed in claim 9, characterized in that the fastening face (3) of the interior part (2) is of planar design, i.e. has no opening.

Technical Field

The invention relates to a method for producing a plastic container, wherein at least one interior part is fixed to the wall of the plastic container, and to such a plastic container.

Background

Containers, in particular containers for motor vehicles, such as fuel tanks, are known which are manufactured from plastic, such as HDPE (high density polyethylene). The manufacture can be carried out, for example, by blow molding or deep drawing. The container wall of such a fuel tank made of plastic may contain a barrier layer, for example made of EVOH (ethylene vinyl alcohol copolymer), in order to reduce undesirable hydrocarbon emissions.

It is also known to fix a plurality of components in and on a plastic container. In particular, during the production of the plastic container, the plurality of interior components can be fastened to the heated container wall by welding in a material-fitting manner.

The insert part or the additional part can also be welded in and on the container by cold and hot welding by means of additional clamped or co-injection-molded parts using 2K technology, so-called "weld tops" (Schwei β kronen), which are made of the same material as the plastic container.

There is also a method of manufacturing a rivet joint by, during the joining process, penetrating the heated soft material of the container through the opening of the parts to be welded and punching the soft material on the outward side by means of a stamping punch. The material of the component to be applied does not have to correspond to the material of the plastic container. The blow-molded part can be a plastic fuel tank, but can also be any other part made of thermoplastic.

In the prior art for mounting components by welding, several aspects and frame conditions must be provided for proper welding. In the case of incorporating a preheated weldment into a still hotter sheet material, the heat penetration zone must be addressed so as not to damage the multi-layer sheet composite. In most cases, costly adjustments to the process are necessary. A certain distance, which may be several millimetres, is necessary for the welding dome, in particular for mounting the valve. This is a significant technical disadvantage for many container solutions.

In the case of hot stamping, installation space for the installation of the tab needs to be reserved around the actual component, which can lead to compromises in the design of the container system and can be regarded as a significant technical disadvantage.

The invention makes it possible, on the one hand, to dispense with the parts which are additionally required for welding the parts to or in the plastic container and which must be made of the same material as the plastic container, and, on the other hand, to dispense with the required installation space or the required surfaces which are required for hot stamping methods using parts made of different materials.

Thus, components that may be composed of materials that are not compatible with the blow-molded part should be able to be applied directly on or in the blow-molded part without the need for additional tools and components.

Disclosure of Invention

The object of the invention is to provide a method for producing a plastic container which avoids the above-mentioned problems, and which in particular provides a simple and inexpensive method for mounting an interior component in a plastic container, in which as little installation space as possible is lost and the interior component can also be composed of a material which differs from the container wall. The invention further solves the problem of providing a plastic container which has a securely fixed interior part and can be produced in the provided simple manner.

The object is achieved by a method for producing a plastic container, wherein the plastic container comprises a container wall and at least one interior component is fixed to the container wall, wherein the interior component has a fixing surface with a retaining geometry protruding from the fixing surface, comprising the following steps: heating the wall of the container at least in one fixed area; the fastening surface of the interior component is pressed against the heated fastening region of the container wall, wherein the retaining geometry is pressed into the container wall without penetrating the container wall, such that the free end of the retaining geometry is located in the interior of the container wall, wherein the plastic of the container wall is located between the retaining geometries, in order to produce a form fit between the retaining geometry of the interior component and the plastic of the container wall.

According to the invention, an interior component is used which has a plurality of retaining geometries on the fastening surface. According to the invention, the retaining geometry is pressed into a hot, soft container wall made of plastic. The container wall may be heated, for example, during the manufacturing process of the container, in particular by heating during the forming of the container, or may be heated in a separate process after the container is manufactured. The pressing of the retaining geometry into the container wall takes place with such a force that the retaining geometry penetrates into the container wall but does not penetrate through the container wall and therefore does not damage the container wall. The "free end" of the retaining geometry, i.e. the end of the retaining geometry facing away from the fastening surface, does not penetrate the container wall. The retaining geometry is thus retained in a simple manner by the plastic of the container wall without weakening the container wall.

The connection can also be established by means of an interior component consisting of a material different from the material of the container wall. The interior component can therefore also be made of a different plastic than the container wall or of metal, for example. The connection is achieved by simple pressing and can therefore be implemented at low cost. A secure retention of the interior component is achieved by using a plurality of such retention geometries.

Preferably, the retaining geometry forms an undercut and/or the retaining geometry has a form-fitting element. The retaining geometry may for example have a face designed to be substantially undercut with respect to the engagement direction. A particularly secure retention of the interior component in the direction of possible loads is achieved by such a retaining geometry having undercuts and/or form-fitting elements.

The retaining geometry can be designed such that the retaining geometry heads are each connected to the fastening surface via a retaining geometry base, which has a smaller cross section than the retaining geometry heads. In particular, the retaining geometry can be designed in the shape of a mushroom.

The fastening surface of the interior component can be pressed against the heated fastening region of the container wall in such a way that the geometry-retaining head is pressed into the container wall and is located in the interior of the container wall, wherein the plastic of the container wall is located behind the head, which acts as an undercut, between the geometry-retaining seats, so that a form fit is produced between the geometry-retaining surface of the interior component and the plastic of the container wall. The retaining geometry thus has a cross section in which the undercut head is wider than the base part connecting the head to the fastening surface. Such a retaining geometry is pressed into a hot, soft container wall made of plastic. The pressing of the retaining geometry into the container wall takes place with such a force that the head and at least a partial section of the base of the retaining geometry enter the container wall but do not penetrate the container wall and therefore do not damage the container wall. This produces a form-fitting connection between the plastic of the container wall and the retaining geometry of the interior part behind the head of the retaining geometry.

The retaining geometry can be designed as an oblique rib, i.e. as a projecting face which is inclined at an angle to the fastening face. The retaining geometry can also be designed as an arch, an angle, a hook or another undercut geometry, and, for example, when viewed toward the fastening face, the retaining geometry can form a rectangle or lines parallel to one another, i.e., these lines parallel to one another result from the faces parallel to one another.

The retaining geometry may also be formed by any combination of the mentioned geometries.

Preferably, the holding geometry extends linearly in a direction perpendicular to the inclined, arched, angled, hook-shaped, mushroom-shaped or other undercut cross section, wherein preferably a plurality of linear holding geometries are arranged parallel next to one another.

The container wall preferably has a barrier layer in the fixing region. In this case, the fastening surface of the interior component is preferably pressed against the heated fastening region of the container wall in such a way that the retaining geometry is located in front of the barrier layer, i.e. does not penetrate the barrier layer. In this connection method, the barrier layer is therefore left intact, so that the discharge behavior of the container is improved in comparison with other fastening methods, for example, using connection elements which penetrate the container in a trough-like manner.

The fastening surface of the interior component is preferably pressed against the heated fastening region of the container wall in such a way that the fastening surface of the interior component rests against the fastening region of the container wall.

The fastening surface of the interior component is preferably designed to be planar, so that it has no openings. Thus, plastic can fill the enclosed space between the geometrically held seats, resulting in a particularly good form-fitting retention. In addition, it is simpler for the closed fastening surface to press the interior component into the container wall only to the required extent and thus not damage the container wall and the barrier layer that is present if necessary.

The plastic container according to the invention therefore comprises a container wall and at least one interior component which is fixed to the container wall. The interior component has a fastening surface with a retaining geometry protruding from the fastening surface, wherein the fastening surface of the interior component is fastened to a fastening region of the container wall, so that the retaining geometry penetrates into the container wall and is located in the interior of the container wall without penetrating through the container wall, wherein the plastic of the container wall is located between the retaining geometries in order to produce a form fit between the retaining geometry of the interior component and the plastic of the container wall. The form fit is preferably produced solely by pressing the retaining geometry into the container wall without additional shaping operations.

The retaining geometry preferably forms an undercut and/or has form-fitting elements.

The retaining geometry can also be designed as oblique ribs, arches, angles, hooks or rectangular elements and/or can have other form-fitting elements or undercuts.

The retaining geometry can be designed in cross section such that the head of the retaining geometry is connected to the fastening surface via a respective retaining geometry base, which has a smaller cross section than the head of the retaining geometry, and the retaining geometry can be designed in particular to be mushroom-shaped in cross section. The plastic of the container wall can be located behind the elements of the retaining geometry which act as undercuts, for example behind the head, between the retaining geometry seats, in order to produce a form fit between the retaining geometry of the interior component and the plastic of the container wall.

The retaining geometry can, for example, be pointed on its upper side facing the container in order to press more easily into the container wall, and/or it can be flat on its side facing away from the container, or it can be concave or it can be inclined outward toward the interior part in order to achieve a better form fit or a better undercut.

The retaining geometry preferably extends linearly in a direction perpendicular to the cross section, in particular the inclined, arched, angled, hook-shaped, mushroom-shaped or rectangular cross section, wherein a plurality of linear retaining geometries are particularly preferably arranged parallel next to one another.

The container wall preferably has a barrier layer in the fixing region and the retaining geometry is located in front of the barrier layer, i.e. does not penetrate the barrier layer.

The fastening surface of the interior component preferably rests against a fastening region of the container wall.

The fastening surface of the interior component is preferably of planar design, i.e. has no openings.

Drawings

The invention is described below with exemplary reference to the drawings.

Fig. 1 is a three-dimensional view of the mounting surface of the interior component of the plastic container according to the invention.

Fig. 2 is a sectional view showing the connecting region between the interior part and the wall of the container of the plastic container according to the invention.

Detailed Description

Fig. 1 shows a fastening surface 3 of a built-in part 2 of a plastic container according to the invention. The fastening surface 3 of the interior part 2 has a plurality of undercut retaining geometries 4 in cross section, which extend linearly along the fastening surface 3 in a plurality of mutually parallel tracks. The fastening surface 3 is designed to be pressed into the heated container wall 1 of the plastic container, wherein the retaining geometry 4 is hooked into the plastic of the container wall 1.

An interior component 2 is fixed to a plastic container of fig. 2, for example, a container wall 1 of a fuel tank.

The interior component 2 has a fastening surface 3 with a retaining geometry 4 that is undercut, i.e. mushroom-shaped, in cross section, so that the heads 5 of the retaining geometry 4 are each connected to the fastening surface 3 via seats 6 of the retaining geometry 4, which have a smaller cross section than the heads 5 of the retaining geometry 4. The fastening surface 3 of the interior part 2 is fastened to the fastening region of the container wall 1, so that the head 5 of the retaining geometry 4 penetrates into the container wall 1 without penetrating the container wall and is located inside the container wall 1, wherein the plastic of the container wall 1 is located behind the head 5, which acts as an undercut, between the bases 2 of the retaining geometry 4, so that a form fit is produced between the retaining geometry 4 of the interior part 2 and the plastic of the container wall 1.

The retaining geometries 4 extend in a linear manner in a direction perpendicular to the undercut, i.e. mushroom-shaped, cross section, wherein a plurality of linear retaining geometries 4 are arranged parallel next to one another.

The container wall 1 has a barrier layer 7 in the fixing area and the head 5 holding the geometry 4 is located in front of the barrier layer 7 so that the holding geometry 4 does not penetrate the barrier layer 7.

The fastening surface 3 of the interior part 2 rests against a fastening region of the container wall 1.

The fastening surface 3 of the interior component 2 is designed to be flush with the surface, i.e. without openings.

The interior component 2 to be fixed on or in the plastic container is pressed into the soft material of the container wall 1. The interior components 2 can be preheated, partially preheated or pre-warmed to room temperature, depending on the process.

The container wall 1 must be so soft that the region of the component 2 to be connected provided for the connection can be pressed in to such an extent that the material displaced by the pressing in flows into the predetermined region of the connection geometry or retaining geometry 4. This can be done by direct embedding in the process or by local heating of the vessel wall 1.

Various geometries can be used for this purpose, which are designed with a displacement geometry and a material inflow geometry.

An unreleasable, permanent connection can be provided by pressing the retaining geometry 4 in and flowing the plastic into the widened cross section of the retaining geometry 4, i.e. behind the head 5.

The form-fit connection is preferably designed such that the barrier layer 7 of the container wall 1 is not damaged during the pressing-in process. This is ensured by a suitable design of the undercut geometry or the retaining geometry 4.

List of reference numerals

1 container wall

2 built-in component

3 fixing surface

4 retention geometry

5 head part

6 base

7 Barrier layer