EP3368438B1 - Extrusion blow moulded container - Google Patents

Description

Field of invention

The invention relates to a container made from a plastic material by extrusion blow molding according to the preamble of claim 1.

State of the art

The production of plastic containers, in particular plastic bottles, for example made of polyethylene or polypropylene, is carried out by extrusion blow molding. Plastic suitable for blow molding is plasticized using an extruder and introduced into a hose head. In the hose head, the plastic is formed into a hose, which is inserted into a blow molding tool. The hose is introduced into the blow molding tool and is inflated with the tool closed via a blow mandrel using excess pressure of a gas, so that the hose expands and is pressed against an inner wall of a cavity of the blow molding tool and takes on the shape of the inner wall, which has the negative shape of a container . The inner wall is used to cool the container blown from the tube until the plastic has hardened. The container is then removed from the opened blow molding tool. In a separate step, the so-called slugs, which form due to the hose protruding when the blow mold is closed and are usually connected to the removed container, are separated and can be fed into the recycling stream. The hose can be single-layer or multi-layer.

Typically, the outlet openings are formed at one end of the container during blow molding. Accordingly, the containers are filled via the outlet opening during the filling process. The filling speed on the filling line therefore depends on the cross section of the outlet opening and the consistency of the product to be filled.

The US 5,013,517 discloses a blow molded container. The container has an upper, non-intrinsically stable area, at the upper end of which a pressure closure is formed during blow molding. At the bottom of the top area is connected to a lower area of the container, which has a greater wall thickness than the upper area and is therefore inherently stable. The lower area of the container is closed by a bottom. The upper end of the container on which the pressure closure is formed can be flattened, whereby the two ends of the pressure closure can be brought into positive engagement with one another. This means that the upper end of the container can be re-closed using the pressure closure.

In the US 2010/0172600A1 A flexible container is described, which is made from a film. To produce the container, a first and a second side wall and a bottom wall, which walls are cut out of the film, are welded or glued together at their edges. The container can also be folded from a single sheet of foil. The first and second walls and the bottom wall are sealed together at the folded edges.

In the FR 2 794 428 A1 Overpackaging in the form of a blister pack is described. The packaging is intended to hold a solid object. The packaging is extrusion blow molded and has a rectangular receiving box into which the solid object is inserted. In the blow mold, a polyhedral section is then formed into the rectangular receiving space. The polyhedral section closes the opening of the box. The polyhedral section includes two opposing flaps and two triangular parts connecting the two flaps. To create the flaps, the upper fold line that connects the flaps is cut off in strips after the packaging has been removed from the mold. The two triangular parts are also cut off. By cutting off the fold line and the triangular parts, the opening is released. After inserting the object into the receiving space through the opening, the two flaps are connected to one another on their upper long sides. This partially closes the opening. The packaging is open in the area of the cut triangular parts. The object can be presented in the packaging in a sales room by providing openings on the flaps from which the packaging and the solid object can be hung.

In the EP 2 910 486 A1 describes a foil bag whose body is rolled out of foil. By providing a longitudinal seam, a cylinder is formed from the film. The lower end of the cylinder is closed with an inner part and an outer part made of foil, forming a stand-up pouch.

Task of the invention

One task can be seen in proposing a closable container produced by extrusion blow molding, through the shaping of which the complexity of filling with the filling material can be reduced.

Description of the invention

According to a first embodiment of the invention as disclosed in claim 1, a container made from a plastic material by extrusion blow molding is proposed, which has a container body with a first end and a second end substantially opposite the first end. The first end has on its inner wall a first sealing surface and a second sealing surface substantially opposite the first sealing surface, wherein the first and second sealing surfaces can be connected to one another in a fluid-tight manner. The second end is sealed in a fluid-tight manner and is designed as a container base with a standing surface.

Essentially, the container is designed as an extrusion bias-formed cup, at the first end of which, namely the open end, the filling material can be filled between the sealing surfaces at high speed. The air to be displaced by the filling material during filling into the extrusion blow molded container can escape over the entire cross-sectional area of the container and accordingly does not lead to an impairment of the filling, as can be the case with containers according to the prior art, especially with small openings. Because the air can escape essentially pressure-free, there is generally no foam formation in the filling material to be filled while the container is being filled. After the container has been filled, it can be closed in a fluid-tight manner by means of the sealing surfaces formed on the inner wall. Closing can be done by gluing or preferably by welding. Accordingly, the sealing surfaces are preferably formed by a weldable or adhesive material. Advantageously, no welding additives are required, but the container with the filled product can be made by heating and pressing the opposite sealing surfaces, as can be done, for example, by welding bars. The sealing surfaces can only be partially provided in the joining area with coatings such as an adhesion promoter or a hot melt adhesive, for example by spraying, rolling or can be applied as tape. As a rule, adhesion promoters and hot melt adhesives have a lower melting point than the plastic of the preform from which the container is made. The adhesion promoters or hot melt adhesive can also be textured. The bonding agent or hot melt adhesive can also be used to connect inserts to the container that would not be connected to the container by welding. An insert element can be, for example, a film with a pass-through opening or a closure part. The insert element can also extend over the entire length of the sealing surface. In the first approach, the sealing surface is to be understood as the welding or adhesive surface, which, as explained above, can also have coatings. The container itself can be designed with one layer or multiple layers, so that barrier layers such as EVOH or PA can also be formed in the container. The container body is stable and stabilization by appropriate devices during transport through the filling line is not necessary. The design of the base, which is inherently stable thanks to its extrusion-blow molding, also makes a decisive contribution to this. The cross section of the container is essentially unlimited with regard to its geometric design. For practical considerations, the cross-section of the container will be round, oval, elliptical or rectangular. The cross-sectional shape can also change over the longitudinal extent of the container. For example, the base can be square and the first end can be circular. Due to the high inherent stability of the container, it can be decorated before or after filling, for example by printing or sticking on labels or so-called sleeves. Since the container is extrusion blow molded, a decoration that is raised or recessed relative to the adjacent wall of the container body can also be formed, which can also consist of lettering, for example. Decoration can also be applied to the blow mold cavity in its cavity by in-mold labeling during extrusion blow molding. The standing surface on the bottom of the container can be designed all around or in the form of feet that are spaced apart from one another. Of course, the bottom of the container does not have an opening that can be used to fill or empty contents. After filling, the two sealing surfaces are pressed against each other and connected to one another or to one another in a fluid-tight manner. The fluid-tight connection can be made by gluing or welding. If the container is glued, the adhesive can be supplied from the outside or already applied to the inside of the sealing surfaces. Bonding or welding can be done by applying heat. For UV-permeable material, bonding can also be done using UV-curing adhesives. As a rule, an inseparable, fluid-tight connection between the sealing surfaces is created. For example, on the finished container, the sealing surfaces and a longitudinal extension axis of the container can enclose any angle, which can be equal to or greater than 0° and equal to or less than 180°. This angle can be, for example, 90°, 45° or 30°. Furthermore, the sealing surfaces on the finished container do not necessarily have to be straight. For example, they can also be designed in a wave shape or in a sine wave shape.

According to a further embodiment of the invention, a first portion of the container body adjacent to the container bottom has a first wall thickness and a second portion adjacent to the first portion and extending in the direction of the first edge has a second wall thickness. The first wall thickness and the second wall thickness are different from each other.

The wall thickness of the first portion of the container body adjacent to the container base can be thicker than a second portion adjacent to the first portion, which can extend to the first end. Of course, the container body can taper continuously from the container bottom to the second edge.

According to a further embodiment of the invention, an acute angle is enclosed between a wall of the container body and a central axis of the container such that an area enclosed by the inner wall at the first end is larger than an area enclosed by the inner wall at the second end.

As a result, the containers can be stacked one inside the other and can be stored in a space-saving manner and/or transported to the filling line.

According to a further embodiment of the invention, the angle enclosed between a wall of the container body and a central axis of the container is greater than or equal to 0.5° and equal to or less than 30°, preferably equal to or less than 15° and particularly preferably equal to or less than 7.5 °.

As a rule, the angle will be chosen so that the containers stacked one inside the other can be easily removed from the stack individually without any additional aids. In particular, the angle will be chosen so large that self-locking is effectively avoided.

According to a further embodiment of the invention, after filling the container with a filling material, the first and second sealing surfaces are connected to one another in a fluid-tight manner.

According to a further embodiment of the invention, a closure element with an outlet opening is arranged between the sealing surfaces and is connected in a fluid-tight manner to the first sealing surface and the second sealing surface.

The closure element is held simply and reliably between the first and second sealing surfaces, since it is welded or glued to the sealing surfaces, which must be connected to one another in a fluid-tight manner after the container has been filled with the contents. An adhesive process can be used to connect partners who are not capable of welding to one another. For example, a container made of HDPE can be permanently connected in a fluid-tight manner to a closure element made of PP, and vice versa. The adhesive layer can also be applied exclusively to the closure element if it is adapted to the opening of the container. The fluid-tight connection of the sealing surfaces to one another and the fluid-tight connection of the closure element to the sealing surfaces can thus take place in one operation. The provision of sealing surfaces and a closure element arranged between them is particularly advantageous since this allows the closure element to have complex shapes that do not have to be formed during extrusion blow molding. Rather, the closure element is arranged between the sealing surfaces after extrusion blow molding. The blow mold for producing the container according to the present invention can therefore be designed to be simpler than blow molds in which the shape of the closure element is blow molded. In many cases, shapes of the closure element cannot be formed using extrusion blow molding. The container can therefore be produced in a blow mold without a formation for an outlet opening being provided in the blow mold would have to. The closure element can be produced in a wide variety of manufacturing processes, for example injection molding, since it is independent of the extrusion blow molding of the container. It goes without saying that, if necessary, more than one closure element can be arranged between the sealing surfaces.

According to a further embodiment of the invention, the closure element has a neck. The outlet opening extends through the closure element and the neck.

The contents can therefore be removed through the neck and are at a sufficient distance from the container body. The neck can be designed at its free end in such a way that liquid container contents can be removed without dripping.

According to a further embodiment of the invention, the closure element has a middle part and at least one end part, the middle part tapering towards the at least one end part, whereby it has a streamlined shape.

The streamlined shape in particular makes it possible for the sealing surfaces to come into contact with the closure element at every point and for there to be no leaks between the sealing surfaces and the closure element. The end part will usually be pointed, while the middle part will be curved. This means that the end part can smoothly merge into a fold that is formed by the sealing surfaces connected to one another. The middle part can be curved, preferably evenly curved. The middle part can also form a corner of the fold, in which case this corner can then not be pointed but can be designed as a round corner. As a rule, the middle part will be formed essentially as a straight circular cylinder transversely to the longitudinal direction of the fold, so that the streamlined shape is essentially formed by a two-dimensional curved surface which extends in the longitudinal direction of the fold. Two end parts can also be arranged on the middle part. The two end parts are then usually opposite each other, but can also enclose an angle that is smaller than 180° and larger than 0°.

According to a further embodiment of the invention, at least one welding rib is formed on the closure element at least partially along a longitudinal extent of the sealing surfaces.

As a rule, the welding rib, which is designed as an elevation on the closure element extending in the direction of at least one of the sealing surfaces, will be formed both on the side facing the first sealing surface and on the side of the holding insert facing the second sealing surface. The welding rib reduces the amount of heat to be applied for welding, so that overall less heat is introduced into the container. More than one welding rib can be arranged on one side of the closure element, the welding ribs generally having the same shape and being spaced apart from one another. Providing more than one welding rib can ensure that the occurrence of leaky welds between sealing surfaces and the closure element is minimized. If one welding rib has a leak, the other welding rib is most likely tight. In order to increase security, more than two welding ribs can also be provided on the closure element.

In a further preferred embodiment of the invention, the sealing surfaces extend along the first end.

The first end, after being extrusion blow molded, has a fill opening which is delimited by the first and second sealing surfaces. In comparison to known extrusion blow-molded containers whose filling opening corresponds to the pouring opening, the filling opening of the claimed container is only limited by its width. The filling process can therefore be simplified and accelerated by the enlarged filling opening.

In a further particularly preferred embodiment of the invention, the first end is continuously designed as a first and second sealing surface.

In this embodiment, the filling opening has the maximum size and is limited at the edge by the container body. Sealing surfaces that do not extend to the wall of the container body are also conceivable. Depending on the application of the container, sealing surfaces of any length and shape can be formed in the blow mold.

In a further preferred embodiment of the invention, the sealing surfaces each have a first and second section, with the closure element being arranged in the first section.

The first and second sections can have different sealing lengths, sealing surfaces with different surfaces and different angles to one another. This means that the first section and the second section can be used for different applications. For example, the first section can be used to hold the closure element and the second section can be used to form a handle. become.

The first section and the second section expediently enclose an angle that is greater than 0° and less than or equal to 180°.

This allows the neck to be oriented away from the horizontal plane. This can make it easier to pour out the contents of the container in a targeted manner, especially when the container is full.

According to a further embodiment of the invention, the second section is designed like a film and has a pass-through opening.

By punching out a pass-through surface in the second film-like section, a handle can be easily formed. By choosing the size of the surface of the second section, a handle can be formed which is adapted to the weight of the filled container and does not tear out. As a rule, the second section will be formed in that the two sealing surfaces are connected to one another in a fluid-tight manner over the entire surface. However, the sealing surfaces of the second section can also only be partially connected to one another in a fluid-tight manner, for example all around the access opening and for demarcation, so that the container contents cannot reach the environment except through the outlet opening.

In a further particularly preferred embodiment of the invention, the second end of the container is designed as a standing surface.

The container has a stable stand due to the provision of the standing surface. In particular when the container is unfilled or partially empty, the standing surface causes a stable stand despite the reduced weight of the container. The formation of the standing surface during extrusion blow molding enables the formation of a standing surface without protrusions. As a result, the container has a standing surface, the entire surface of which rests on the ground.

Preferably, the container is formed from an extrusion blow-molded hollow body that is open at the first end, which can be filled through the first end and whose first end can be closed by the fluid-tight connection of the sealing surfaces. The hollow body has a base and an adjoining wall and can be manufactured in a relatively simple blow mold. The filling opening is only reduced in size after filling with the product. Since the closure element can only be arranged between the sealing surfaces after the extrusion blow molding process or even after filling, its shape is decoupled from the extrusion blow molding. The closure element can therefore have any shape that does not influence the extrusion blow molding process.

An extrusion blow molded handle is expediently formed on the container body.

This can be present instead of or in addition to the through opening formed in the second section. It is also conceivable that other design elements, such as stiffeners or depressions, are also formed during extrusion blow molding. If two handles, or a handle and a pass-through opening, are provided on the container, product emptying from the container is particularly practical, since the pass-through opening of the second section or the first handle serves to hold the container and the container is targeted with the second handle can be pivoted.

According to a further embodiment of the invention, the ratio of a maximum thickness of the middle part, which extends between the first sealing surface and the second sealing surface, to a length of the closure element, which extends along the sealing surfaces, is between 1:1 and 1:10 and is preferred between 1:2 and 1:4.

As a result, the curvature of the holding insert is not too pronounced, which means that the sealing surfaces can rest against the holding insert over the entire surface.

The closure element is advantageously made of a material which can be connected in a fluid-tight manner to the material of the sealing surfaces.

As a rule, the holding insert and the sealing surfaces are made of plastic. Because the plastics of the sealing surfaces and the holding insert flow into one another during welding, their connection is usually permanently tight.

According to a further embodiment of the invention, the closure element has fastening means on its neck, which can be brought into engagement with corresponding fastening means of a closure cap in such a way that the outlet opening can be closed in a fluid-tight manner.

The fastening means can be bayonets, threads, thread segments, projections or recesses with which closure caps such as bayonet closures, screw closures or snap closures can be attached to the neck to prevent wear on the outlet opening. The closure can also be firmly connected to the closure element, or neck, and thus be captive.

According to a further embodiment of the invention, the fastening means are at least sections of at least one thread that corresponds to one another, so that the closure cap can be repeatedly screwed onto the neck and/or unscrewed from the neck.

This means that it is not necessary for the container to be completely emptied after opening it for the first time.

According to a further embodiment of the invention, the container is formed in one piece.

Further advantages and features result from the following description of an exemplary embodiment of the invention with reference to the schematic representations, which are not shown to scale.

Short description of the characters

Figure 1

shows a longitudinal section of an extrusion blow molded container of the proposed type;

Figure 2

shows a longitudinal section through identical extrusion-blow molded containers stacked one inside the other Figure 1 ;

Figure 3

shows an isometric view of the fluid-tight sealed extrusion blow molded container according to Figure 1 ;

Figure 4

shows a side view of the proposed extrusion blow molded container Figure 1 with a closure element in a first embodiment;

Figure 5

shows a side view of the proposed extrusion blow molded container with the closure element in a second embodiment; and

Figure 6

shows a view of the extrusion blow molded container according to Figure 4, in which the closure element is shown from above.

Detailed description of exemplary embodiments

Fig. 1 shows a proposed container 11 produced using the extrusion blow molding process, which has a container body 13, the container body 13 has a first end 15 and a second end 17 which is essentially opposite the first end 15. The second end 17 is closed in a fluid-tight manner and is designed as a container base 18, on which a standing surface 19 is formed. The extrusion-blow-molded container 11 has an inner wall 20. The inner wall 20 delimits a filling opening 16 at the first end 15, through which a filling material is filled into the extrusion-blow-molded container 11. The first end 15 has on its inner wall 20 a first sealing surface 21a and a second sealing surface 21b opposite the first sealing surface 21a, which can be connected to one another in a fluid-tight manner and are connected to one another in a fluid-tight manner after the filling material has been filled. For this purpose, the sealing surfaces 21a, 21b can be coated, for example, with a hot melt adhesive or an adhesion promoter, which can also be textured. The container 11 extends along a center line II. The center line II and an outer wall 22 of the container 11, which is essentially opposite the inner wall 19, enclose a first angle α, which is 5 ° in the present exemplary embodiment. The first angle α is chosen so that when extrusion-blow-molded containers 11 are stacked one inside the other, the upper extrusion-blow-molded container 11 can be easily displaced from the lower extrusion-blow-molded container 11. As a rule, the first angle α is chosen so that the outer wall 22 of the upper extrusion blow molded container 11 with the inner wall 19 of the lower extrusion blow molded container 11 is not self-locking.

Fig. 2 shows a longitudinal section through three identical extrusion-blow-molded containers 11 stacked one inside the other. Because the containers 11 do not stick to one another, no additional aids are required to remove the top extrusion-blow-molded container 11 by pulling it out or to remove the bottom-most extrusion-blow-molded container 11 from the stack.

Fig. 3 shows an isometric view of the Fig. 1 known fluid-tight sealed extrusion blow molded container 11. For a better overview, the extrusion blow molded fluid tight sealed container 11 is shown translucent without filling material. It is understood that the extrusion blow-molded container 11 is then sealed in a fluid-tight manner after it has been filled with the filling material. The extrusion blow-molded container 11 has a substantially rectangular container base 18 at the second end 17 of the container body 13. For fluid-tight sealing, the opposing sealing surfaces 21a, 21b have been pressed against one another and, in the present exemplary embodiment, have been inextricably connected to one another under the influence of heat.

Fig. 4 shows the proposed extrusion blow molded container 11 according to Figure 1 with a closure element in a first embodiment. Here too, two opposing sealing surfaces 21a, 21b are formed at the first end 15. The sealing surfaces 21a, 21b extend continuously along the first end 15. The two sealing surfaces 21a, 21b can be connected to one another in a fluid-tight manner by being glued together. Before filling with filling material, the first end 15 forms a filling opening which is delimited by the inner wall 20 and therefore does not have a narrowing filling opening 16. The container 11 can be filled particularly quickly through this filling opening 16. A closure element 23 is arranged between the two sealing surfaces 21a, 21b. In the present exemplary embodiment, the closure element 23 is arranged centrally between the two sealing surfaces 21a, 21b. The two sealing surfaces 21a, 21b lie fully against an outer wall 22 of the closure element 23. To support the system, the closure element 12 tapers from its middle part 25, through which an outlet opening 29 of the closure element 23 extends for removing the filling material, to its two opposite end parts 27a, 27b, like this in Figure 6 is visible. A distance between the two sealing surfaces 21a, 21b from one another increases continuously from the two end parts 27a, 27b to the middle part 25. The proposed design of the closure element 23 with the outer wall 22 to be glued or welded, which extends along the two end parts 27a, 27b and the middle part 25, ensures a fluid-tight, inseparable connection between the sealing surfaces 21a, 21b and the closure element 23. Along the long sides of the holding insert 23 facing the two sealing surfaces 21a, 21b, two spaced-apart welding ribs (not shown here) can extend on each long side. Two welding ribs extending parallel to each other on each long side increase the security that a welded connection between the sealing surfaces 21a, 21b and the closure element 23 is fluid-tight. The outlet opening 29 extends through the closure element 23. It is preferred if the closure element 23 and a neck 31 are formed in one piece. The neck 31 can have an external thread onto which a closure cap 33 can be screwed. The neck 31 and the closure element 23 are penetrated by the outlet opening 29 so that a filling product can be emptied through the closure element 23. The filling material is preferably filled through the open first end 15 of the container 11 and then the first end 15 is welded to the sealing surfaces 21a, 21b after the closure element 23 has been arranged between the sealing surfaces 21a, 21b. The stability of the extrusion blow molded container 11 is achieved by forming the standing surface 19 on the container bottom 18. The stability and inherent stability of the container 11 leads to easy filling of the container 11. The closure element 23 can be permanently connected to the sealing surfaces 21a, 21b in a fluid-tight manner, for example by welding or gluing.

Fig. 5 shows a side view of the proposed extrusion blow molded container 11 with a closure element 23 in a second embodiment. The first end 15 has a first section 35 and a second section 37. Both sections 35, 37 are designed as opposing sealing surfaces 21a, 21b. In the area of the first section 35, the closure element 23 is arranged between the sealing surfaces 21a, 21b and is connected to them in a fluid-tight manner. The second section 37 has wider sealing surfaces 21a, 21b than the first section 35, which are connected to one another in a fluid-tight manner. The second section 37 forms in the present exemplary embodiment a thick film, which is penetrated by a through opening 39. The access opening makes it easier to hold the container 11 when carrying and pouring the contents. The first and second sections 35, 37 preferably include a second angle β which is greater than or equal to 0° and less than or equal to. In the present exemplary embodiment, the second angle β included between the first section 35 and the second section 37 is 90°. Because the closure element 23 is arranged approximately centrally in the first section 35, the closure element 23 is also spaced from the central axis II of the container 11 and is therefore eccentric. Furthermore, the neck 31 with its outlet opening 29 can be made from a position extending essentially parallel to the central axis II of the container 11, as in Fig. 4 shown, moved. For this purpose, the central axis II of the container 11 and a central axis of the closure element extending essentially centrally through the outlet opening 29 can enclose a third angle γ, which is greater than or equal to 0° and less than 180°. In the present exemplary embodiment, the third angle γ is 45°. By tilting the central axis of the closure element 23 away from the central axis II of the container 11, the exit of the filling material is oriented further downwards and is thereby made easier.

Fig. 6 shows a view of the extrusion blow molded container 11 according to Figure 4 , in which the closure element 23 is shown from above. For better illustration, the closure element 23 is shown cut at the edge of the extrusion blow-molded container 11. In order to ensure the longest possible sealing surface between the welding ribs of the closure element 23 and the sealing surfaces 21a, 21b, it is preferred that the ratio of the thickness of the middle part 25 to the length of the closure element 23 is at least 1:2.

An extrusion-blow-molded container 11, the filling opening 16 of which is delimited by the first end 15 of the container body 13 and is generally the largest cross-sectional area of the extrusion-blow-molded container 11, is filled with a filling material at a filling line. In a step subsequent to filling, the two sealing surfaces 21a, 21b are connected to one another in a fluid-tight, non-detachable manner by welding or gluing. The fluid-tight sealed extrusion blow-molded container 11 can be emptied by, for example, using scissors or a knife to remove a container corner on the first edge 15 and emptying the contents via this removed container corner becomes. As a rule, the type of extrusion blow molded containers 11 are not resealable and therefore the entire contents are intended for immediate use. Filling goods can be ready-made soups, ready-made sauces and the like. To make it easier to remove the contents in portions or overall from the extrusion blow-molded, fluid-tight container 11, a closure element that can be closed by, for example, a screw-on cap is provided. This closure element is designed in such a way that after the extrusion blow-molded container 11 has been filled with filling material, it is positioned between the sealing surfaces 21a, 21b and at the same time as the sealing surfaces 21a, 21b are connected to one another in a fluid-tight manner, it is also connected in a fluid-tight manner to the closure element 23. Since the fluid-tight inseparable connection is created by means of the sealing surfaces 21a, 21b, the material of the extrusion blow molded container 11 can consist of a material which cannot be welded with a material of which the closure element 23 is made.

Legend:

11

Extrusion blow molded container

13

container body

15

First end of the container body

16

Filling opening

17

Second end of the container body

18

container bottom

19

Stand area

20

inner wall

21a,21b

sealing surfaces

23

Closure element

25

middle section

27a,27b

End parts

29

Exit opening

31

Neck

33

Cap

35

first section

37

second part

39

Access opening

α

First angle

β

Second Winlel

γ

Third angle

Claims (15)

1. Container manufactured from a plastic material in an extrusion blow molding process, having a container body (13) comprising a first end (15) and a second end (17) substantially opposite the first end (15), wherein the second end (17) is closed in a fluid-tight manner and is configured as a container bottom (18) with a support base (19),
   characterized in
   that the first end (15) has a first sealing surface (21a) on its inner wall and a second sealing surface (21b) substantially opposite the first sealing surface (21a), wherein the first and the second sealing surface (21a, 2ab) are formed by an adherable or weldable material and whereby the first and the second sealing surface (21a, 21b) can be connected to one another in a fluid tight manner so that the container can be closed in a fluid tight manner.
2. Container according to claim 1, characterized in that a first partial region of the container body (13), adjacent to the container bottom, has a first wall thickness (w) and a second partial region, adjacent to the first partial region and extending in direction of the first edge (15), has a second wall thickness (w'), wherein the first wall thickness (w) and the second wall thickness (w') are different from each other.
3. Container according to claim 1 or 2, characterized in that an acute angle (α) is formed between a wall of the container body (13) and a central axis of the container in such a manner that a surface enclosed by the inner wall (20) at the first end (15) is bigger than a surface enclosed by the inner wall (20) at the second end (17).
4. Container according to claim 3, characterized in that the angle (α) is greater than or equal to 0,5° and equal to or smaller than 30°, preferably equal to or smaller than 15° and particularly preferably equal to or smaller than 7,5°.
5. Container according to one of the preceding claims, characterized in that the first and the second sealing surface (21a, 21b) are connected to one another in a fluid tight manner after the container has been filled with filling material.
6. Container according to claim 5, characterized in that a closing element (23) with an outlet opening (29) that is connected in a fluid tight manner to the first sealing surface (21a) and to the second sealing surface (21b) is arranged between the sealing surfaces (21a, 21b).
7. Container according to claim 6, characterized in that the closing element (23) has a neck (31), wherein the outlet opening (29) extends through the closing element (23) and the neck (31).
8. Container according to claim 6 or 7, characterized in that the closing element (23) has a central part (25) and at least one end part (27a, 27b), wherein the central part (25) tapers to the at least one end part (27a; 27b) so that it has a streamlined shape.
9. Container according to one of the claims 6 to 8, characterized in that at least one welding rib is configured on the closing element (23) at least partially along a longitudinal extension of the sealing surfaces (19a, 19b).
10. Container according to one of the claims 6 to 9, characterized in that the sealing surfaces (21a, 21b) each have a first section (35) and a second section (37), wherein the closing element (23) is arranged in the first section (35).
11. Container according to claim 10, characterized in that the first section (35) and the second section (37) form an angle (β) that is greater than 0° and smaller than or equal to 180°.
12. Container according to one of the claims 10 or 11, characterized in that the second section (37) is configured film-like and has a reach-through opening (39).
13. Container according to one of the preceding claims, characterized in that an extrusion blow molded hand grip is molded on the container body (13).
14. Container according to one of the preceding claims, characterized in that the ratio of a maximal thickness of the central part (25), that extends between the first sealing surface (21a) and the second sealing surface (21b,) to a length of the closing element (23), that extends along the sealing surfaces (21a, 21b), is between 1:1 and 1:10 and preferably between 1:2 and 1:4.
15. Container according to one of the preceding claims, characterized in that the closing element (23) is made of a material that can be connected in a fluid tight manner to the material of the sealing surfaces (21a, 21b).

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