ES3064213T3 - Packaging made of sheet metal material with tear-off foil lid and material set, and method for producing same - Google Patents

Abstract

The invention relates to a container made of sheet metal with a removable foil lid. The container consists of a seamless frame (1), produced by deep drawing, which forms a wall (6) enclosing the interior of the container. At one end (T), the frame (1) forms a dispensing opening surrounded by a sealing flange (2), which is closed by a removable foil lid (3) sealed to the flange (2). At its other end (B), the frame (1) is connected by a flange to a sheet metal lid (4) that forms the base of the container (7). The container, according to the invention, can be manufactured economically from either sheet steel or sheet aluminum, with low energy and material costs, has no welds, its leak-tightness can be checked before filling, and it allows for high filling speeds.

Description

[0001] DESCRIPTION

[0003] Metal sheet container with sealing foil lid provided with easy-open strip, as well as set of materials and procedure for its manufacture

[0004] Scope of the invention

[0005] The invention relates to a sheet metal container with a sealing foil lid provided with an easy-open strip, as well as to a set of materials for creating these containers, a process for manufacturing the set of materials, and a process for manufacturing filled containers of this type according to the preambles of the independent claims.

[0006] Background

[0007] Containers with foil-sealed lids fitted with easy-open strips (so-called Peel Off Ends or POE), are known in many different sectors, especially as food packaging.

[0008] In the simplest case, these containers consist of two parts: a one-piece container and an easy-open foil seal that closes the filling or removal opening. These two-piece containers with easy-open foil lids have the disadvantage that, when filling the container, the surfaces intended for sealing with the foil can become soiled, potentially leading to a faulty seal and, consequently, a non-hermetic container. To minimize this risk, the filled container must be moved relatively slowly until the foil seal is complete, which significantly limits the production speed of this type of container. Furthermore, there is a risk of the contents becoming contaminated and/or spoiled due to temperature changes during the sealing process.

[0009] To avoid the aforementioned inconveniences of two-piece containers, three- and four-piece containers with easy-open foil lids have been developed, in which case the container is filled from the end opposite the easy-open foil lid and this end is then closed with a separate sheet metal lid.

[0010] These three- and four-piece containers have a frame formed by a longitudinally wound, rolled sheet metal ring that forms the container walls and is closed at its first end by the easy-open foil lid and at its second end by the aforementioned sheet metal lid. Depending on whether it is a three- or four-piece container, the easy-open foil is sealed directly onto a sealing flange formed by the frame (three-piece) or onto a separate sheet metal ring connected to the end of the frame (four-piece).

[0011] The three-piece variants have the disadvantage that the sealing flange is radially crossed by a weld seam, which is not optimal from a technical point of view and can lead to sealing problems.

[0012] In the four-piece variants, the drawback is that an additional component (sheet metal ring with sealing flange) has to be supplied and processed, which entails higher material and production costs, as well as additional waste during manufacturing.

[0013] The aforementioned three- and four-piece containers also have the disadvantage that the sheet metal lid for the container base must be supplied and processed separately, which, compared to two-piece containers, entails considerably higher material and production costs and a larger volume of waste during manufacturing.

[0014] WO 2021/176112 A1 discloses a three-piece container consisting of a deep-drawn cup which, once filled, is closed with a two-piece lid composed of a sheet metal ring whose central opening is covered by a sealing film. This container variant has the disadvantage that handling this type of two-piece lid is problematic and therefore limits the production speed.

[0015] Document CH 530310 A describes a can with a rim having at its upper end a flanged lid ring, the opening of which is closed with an easy-open tab. The rim is joined at its lower end by flanging to a sheet metal lid that forms the bottom of the container, or it is formed in one piece by deep drawing with a can bottom molded into it.

[0016] Representation of the invention

[0017] Therefore, the task is to provide a container with an easy-open foil lid that does not present the aforementioned drawbacks of the prior art or at least partially avoids them.

[0018] This task is solved by the objects of the independent claims.

[0019] According to these, a first aspect of the invention relates to a sheet metal container with an easy-open foil lid. The container comprises a seamless frame manufactured by deep drawing, which forms a container wall surrounding the interior space of the container. The frame has a first and a second end and forms at its first end an extraction opening surrounded by a sealing flange, which is closed with an easy-open foil lid glued or sealed to the sealing flange. The second end of the frame is joined by a flange to a sheet metal lid, which forms the bottom of the container.

[0020] The container according to the invention can be manufactured economically, with low energy and material consumption, from both steel sheet and aluminum sheet, according to the procedures described herein. It has no welds, so there are practically no problems of "blackening" or impermeability. It offers the possibility of checking the seal of the foil lid before filling and allows high filling speeds thanks to filling it from the bottom.

[0021] The sealing flange extends advantageously from the container wall formed by the frame radially (in the direction from the center of the extraction opening) outwards, so that in the plane of the easy-open foil lid it projects outwards from the container wall. This makes it possible to provide an extraction opening that, at the first end of the frame, corresponds to the surface of the container's interior space. Thus, in the case of a cylindrical interior space or one that widens conically from the second end of the frame to the first, the contents can be extracted by inverting the container without losing its shape. This is particularly advantageous for foods that must be presented simply in a specific shape for consumption, such as canned tuna or meat pies.

[0022] It is also preferred that the sealing flange have a surrounding rim that limits the sealing surface to the outside.

[0023] If the sealing flange and the bottom of the container are designed so that the bottom of a first container can be placed within the rim that delimits the sealing surface of a second identical container, good stackability is achieved with simultaneous shape-drag centering of the containers stacked on top of each other thanks to the respective rim of the sealing flange.

[0024] The container wall formed by the frame advantageously defines an essentially cylindrical interior space. This allows the frame to be filled from the second end with dimensionally stable contents and, in the case of containers with a sealing flange extending radially outwards, for these contents to be subsequently removed without loss of shape by inverting the open container through the extraction opening at the first end of the frame.

[0025] If the wall and bottom of the container are made of identical laminated material, in particular steel sheet or aluminum sheet with identical coating, which is preferable, the advantage is that only one type of laminated material needs to be handled for its manufacture and particularly economical manufacturing processes in terms of materials can be used, in which very little sheet metal waste is generated.

[0026] If the bottom of the container is made of an embossed laminated material, it is possible to manufacture the frame and the bottom of the container in a manufacturing process that is at least partially common.

[0027] A second aspect of the invention relates to a set of materials for forming containers according to the first aspect of the invention.

[0028] The set of materials comprises frames manufactured by seamless deep drawing to form the walls of the containers. The frames form at one end a dispensing opening surrounded by a sealing flange, which can be closed by gluing or sealing an easy-open foil lid onto the sealing flange, and at the other end a filling opening through which the interior space surrounded by the container walls can be filled, especially when the easy-open foil lid is glued or sealed onto the sealing flange.

[0029] In addition, the set of materials includes sheet metal caps that can be used to close the filling openings of the frames by creating a flanged joint between the respective frame and the respective sheet metal cap. The sheet metal cap then forms the bottom of the finished container.

[0030] If the sheet metal covers are made of a drawn sheet metal material that is identical to the material of the frames, the advantage is that it is possible to manufacture the frames and the sheet metal covers in a manufacturing process that is at least partially common. However, it is also envisaged that the set of materials according to the invention may consist of frames and sheet metal covers manufactured separately, or of frames and sheet metal covers manufactured both together and separately.

[0031] In a preferred embodiment of the material set, the frame extraction openings are closed with an easy-open sheet cap glued or sealed to the sealing flange, so that the interior space surrounded by the frame is closed by the first end of the frame and can be filled with a filling product.

[0032] The sets of materials according to the invention constitute preferred trade forms of the invention.

[0033] A third aspect of the invention relates to a process for manufacturing a set of materials according to the second aspect of the invention. The process comprises the following steps:

[0034] a) manufacture of identical cup-type containers by deep drawing, provided respectively with a cup opening, a closed cup bottom, a closed cup wall extending between the cup bottom and the cup opening, and a sealing flange surrounding the cup opening;

[0035] b) separation of the bottoms of the containers so as to obtain first container pieces, which consist essentially of the separated bottoms, and second container pieces, which are formed essentially by the respective wall and the sealing flange surrounding the respective opening;

[0036] c) forming the sheet metal lids from the first pieces of the container and forming the edges from the second pieces of the container.

[0037] The procedure according to the invention allows the frames and bottoms of the vessels to be manufactured in a manufacturing process that is at least partially common, which, compared to the separate provision of the bottoms of the vessels, produces a considerably smaller amount of waste and allows for savings in material costs.

[0038] The separation of the vessel bottoms is advantageously achieved by removing a portion of the vessel wall from the corresponding container, such that the separated portion of the vessel wall forms a collar of uniform height surrounding the vessel bottom. In a further processing step, this collar can be modified to form the lid flange.

[0039] In a preferred embodiment, the process further comprises the step of sealing or gluing easy-open foil lids onto the sealing flanges of the second container pieces, so that the opening of the container is completely closed by the easy-open foil lid. In this way, second container pieces are obtained in which the interior space enclosed by the frame is closed at the first end of the frame and can be filled with a product from the second end of the frame.

[0040] Furthermore, it is preferable that, after sealing or gluing, a leak test be performed on the second container part, which is fitted with the easy-open foil lid. This allows the permeable second container parts to be separated before filling, ensuring high-quality packaging.

[0041] In another preferred embodiment, the process further comprises the step of deforming the collars of the first container pieces or deforming the collars of the first container pieces and the ends of the vessel walls of the second container pieces that form the filling opening, respectively, so that these areas can be transformed in a subsequent step to create a flanged joint between one of the first container pieces and one of the second container pieces, in order to close the filling opening of the second container piece with the first container piece. In the material set manufactured according to this embodiment, the sheet metal rims and caps are already prepared to produce the flanged joint between them. It is preferable that any transformation of the vessel wall end of the second container piece that forms the filling opening be carried out before sealing or gluing the easy-open sheet metal cap to the sealing flange. The sealing flange of the cup-type container is preferably designed to extend radially (i.e., from the center of the cup opening) outwards, projecting from the container wall outwards in the plane of the easy-open foil lid. This allows for a dispensing opening that corresponds to the surface area of the container's interior at the first end of the frame. Therefore, in the case of a cylindrical interior or one that widens conically from the second end of the frame to the first, the contents can be removed without losing their shape by inverting the open container. This is particularly advantageous for foods that need to be presented simply in a specific shape for consumption, such as canned tuna or meat pies.

[0042] It is also preferred that the sealing flange be configured so as to have a surrounding rim that limits the sealing surface to the outside.

[0043] It is advantageous to manufacture the container in the shape of a cup so that the container wall formed by the frame defines an essentially cylindrical interior space. This makes it possible to provide sets of materials in which the frame can be filled from the second end with dimensionally stable contents and, in embodiments with a sealing flange extending radially outwards, this content can then be extracted without loss of shape by inverting the open container through the extraction opening provided at the first end of the frame.

[0044] In another preferred embodiment of the process, the drawn cup-type containers are manufactured from a blank sheet, which is stamped at the cup-type container manufacturing site from a sheet strip, particularly coated, especially of steel or aluminum sheet.

[0045] In another preferred embodiment of the process, the easy-open foil lids are die-cut at the location of manufacture of the cup-type container from a foil strip. This can be done outside the sealing device or inside the sealing device.

[0046] This has the advantage that the set of materials can be manufactured in a continuous process in one place from semi-finished materials, without the need for intermediate storage and/or transport of intermediate products.

[0047] A fourth aspect of the invention relates to a process for manufacturing filled containers according to the first aspect of the invention. The process comprises the following steps:

[0048] a) manufacturing identical cup-type containers by deep drawing with a cup opening, a closed cup bottom, a closed cup wall extending between the cup bottom and the cup opening, and a sealing flange surrounding the cup opening;

[0049] b) separating the bottoms of the vessels with a portion of the vessel wall of each container, so that a first vessel piece is obtained, formed by the separated vessel bottom with the separated vessel wall piece, the separated vessel wall piece forming a collar of uniform height surrounding the vessel bottom, and a second vessel piece is obtained, formed by the remainder of the vessel wall and the sealing flange surrounding the vessel opening, the end of the vessel wall opposite the sealing flange forming a filling opening;

[0050] c) sealing or gluing easy-open foil lids onto the sealing flanges of the second container pieces, so that the opening of the cup is completely closed by the easy-open foil lid;

[0051] d) transformation of the collars of the first pieces of the container or transformation of the collars of the first pieces of the container and the ends of the vessel walls of the second pieces of the container that form the filling opening, so that these areas can be converted in a later step into a flanged joint between one of the first pieces of the container and one of the second pieces of the container so that the first piece of the container closes the filling opening of the second piece of the container;

[0052] e) filling the second parts of the container with a filling material after sealing or gluing the easy-open foil lid over the filling opening; and

[0053] f) closing the filling openings of the second container pieces filled with one of the first container pieces, joining the first container piece to the second container piece and creating the flanged joint between the first and second container pieces.

[0054] In this process, one or more sets of materials are manufactured according to the second aspect of the invention, which are then converted into filled containers according to the first aspect of the invention by filling the second container pieces and closing the filling openings with the first container pieces. In this case, it is preferred that the filling opening of the filled second container piece be closed with a first container piece previously separated from this second container piece.

[0055] Alternatively, it is preferred that the filling opening of the second filled container piece be closed with a first container piece separate from another of the second container pieces.

[0056] In the event that some of the first container pieces are lost or become unusable, it is also planned to replace these first container pieces with separately manufactured sheet metal lids.

[0057] In a preferred embodiment of the process according to the fourth aspect of the invention, the forming of the collar of the first container piece, which is used to close the filling opening of the second container piece, is carried out during the period in which the end wall of the second container piece forming the filling opening is shaped, the easy-open foil lid is sealed or bonded to the sealing flange of the second container piece, and/or the second container piece is filled. In this way, continuous production can be achieved without the need for costly intermediate storage of the first container pieces.

[0058] The possible transformation of the end wall of the second container piece that forms the filling opening is preferably carried out before sealing or gluing the easy-open foil lid to the sealing flange. This considerably simplifies the handling of the second container piece for the transformation step.

[0059] The sealing flange of the cup-shaped container is preferably designed to extend radially (away from the center of the dispensing opening) outwards, projecting outwards from the container wall in the plane of the easy-open foil lid. This provides a dispensing opening that corresponds to the surface area of the container's interior at the first end of the frame. In the case of a cylindrical interior or one that widens conically from the second end of the frame to the first, the contents can be removed without losing their shape by inverting the open container through the dispensing opening. This is particularly advantageous for foods that must be presented simply in a specific shape for consumption, such as canned tuna or meat pies.

[0060] It is also preferable that the sealing flange be designed so that it has a surrounding rim that limits the sealing surface to the outside.

[0061] Advantageously, the sealing flange and the container bottom or the flanged joint between the first and second container pieces are designed so that the bottom of the first container can be placed within the rim of the sealing flange that limits the sealing surface to the outside of an identical second container. This achieves good stackability of the manufactured containers, while also ensuring proper centering of the stacked containers due to the respective rim of the sealing flange.

[0062] Cup-shaped containers are preferably manufactured to have an essentially cylindrical interior cup space. This allows the second container pieces to be filled from the second end of the frame with dimensionally stable contents and, in embodiments with a radially outward-extending sealing flange, for these contents to be subsequently removed without loss of shape by inverting the open container through the removal opening.

[0063] In another preferred embodiment of the process, the drawn cup-type containers are manufactured from a blank sheet, which is stamped at the cup-type container manufacturing site from a sheet strip, particularly coated, especially of steel or aluminum sheet.

[0064] In another preferred embodiment of the process, the easy-open foil lids are stamped at the cup-type container manufacturing site from a foil strip.

[0065] This has the advantage that the packaging can be manufactured in a continuous process in one location from semi-finished materials, without the need for intermediate storage and/or transport of intermediate products.

[0066] Before filling the second container pieces, it is advisable to perform a leak test on each of the second container pieces fitted with the easy-open foil lid. This allows any leak-proof second container pieces to be separated before filling, ensuring high-quality filled containers.

[0067] Brief description of the drawings

[0068] Other embodiments, advantages, and applications of the invention are derived from the dependent claims and the following description in view of the figures. These show in the:

[0069] Fig. 1 a perspective view from above of a tuna can according to the invention with an easy-open foil lid; Fig. 2 schematically, the manufacture of a set of materials according to the invention for forming the tuna can of Fig. 1; and

[0070] Fig. 3 schematically shows the manufacture of the tuna can of Fig. 1 from the set of materials of Fig. 2. Methods for implementing the invention

[0071] Figure 1 shows a perspective view from above of a container according to the invention in the form of a three-piece can filled with tuna with an easy-open foil lid.

[0072] The can comprises a seamless frame 1 manufactured by deep drawing from coated steel sheet, forming a can wall 6 surrounding the cylindrical-circular interior space of the can.

[0073] At its upper end T (first end according to claim), the frame 1 forms an extraction opening surrounded by a sealing flange 2, closed by means of an easy-open foil cap 3 sealed over the sealing flange 2, which is therefore not visible. The easy-open foil cap 3 has an easy-open strip 14, by means of which it can be removed from the sealing surface of the sealing flange 2 to open the can.

[0074] At its lower end B (second end according to claim), the frame 1 is joined by a flange 12 to a sheet metal lid 4, which forms the bottom of the can 7. The sheet metal lid 4 is made of the same material as the frame 1. As can be seen, the sealing flange 2 extends radially outwards from the wall of the can 6 formed by the frame 1, so that it projects outwards from the wall of the can 6 into the plane of the easy-open sheet metal lid 3.

[0075] The sealing flange 2 and the bottom of the container 7 are designed so that the bottom of the container 7 of a first can can be placed inside the rim 5 of a second identical can that limits the sealing surface to the outside.

[0076] In this way, good stackability of the cans is achieved and at the same time a centering in drag of the shape of the cans stacked on top of each other by means of the edge 5 of the sealing flange 2 of the respective lower can.

[0077] Figure 2 schematically shows the manufacture of a set of materials according to the invention, in accordance with the second aspect of the invention, to form the tuna can of Figure 1. For reasons of simplicity, only the manufacture of a frame 1 and a lid 4 are shown respectively.

[0078] As can be seen, the starting point is a drawn container 9 (cup-type container according to claim 9) made of coated steel sheet, which has an opening, a closed bottom, a closed wall 6 extending between the bottom and the opening, and a sealing flange 2 surrounding the opening. The sealing surface of the sealing flange 2 of the container 9 is delimited externally by an upwardly projecting edge 5.

[0079] In a first processing step, the drawn cup 9 is divided, by separating the cup bottom from a portion of the cup wall 6a, into a first cup piece 10 (first cup piece according to claim 1) and a second cup piece 11 (second cup piece according to claim 1). The first cup piece 10 is formed by the separated cup bottom from the separated portion of the cup wall 6a, wherein the separated portion of the cup wall 6a forms a collar of uniform height surrounding the cup bottom. The second cup piece 11 is formed by the remainder of the cup wall 6b and the sealing flange 2 surrounding the cup opening.

[0080] In another step, the first and second separate beaker pieces 10, 11 are transformed into a frame 1 and a sheet metal lid 4 from material set 1, 4. To this end, the collar 6a of the first beaker piece 10 and the end B of the wall 6b of the second beaker piece 11, which will subsequently form the filling opening, are transformed so that, in a later step, these areas can be converted into a flanged joint 12 between the sheet metal lid 4 formed from the first beaker piece 10 and the frame 1 formed from the second beaker piece 11, for the airtight closure of the filling opening of the frame 1 with the sheet metal lid 4.

[0081] Figure 3 schematically shows the manufacture of tuna cans according to Figure 1 from frames 1 and sheet metal lids 4 according to Figure 2. In this case as well, for reasons of simplicity, only the manufacture of a single tuna can is shown and described.

[0082] As can be seen, a frame 1 and a sheet metal lid 4 are provided according to figure 2, as well as an easy-open foil lid 3, and the easy-open foil lid 3 is sealed to the sealing flange 2 of the frame 1, so that the original opening of the cup is completely closed and sealed by the easy-open foil lid 3. The opening strip 14 of the easy-open foil lid 3 is folded towards the center of the can.

[0083] After sealing the easy-open foil lid 3, the frame 1 is turned over so that the easy-open foil lid 3 faces downwards and the filling opening formed by the lower end B of the frame 1 faces upwards. In this orientation, the tuna filling 13 is introduced as a stable, pressed cake through the filling opening inside the can 8, surrounded by the wall 6 of the frame 1. This wall has a cylindrical shape complementary to the shape of the pressed cake, so the interior 8 is almost completely filled with the tuna filling.

[0084] Preferably, before filling frame 1, a leak test of frame 1 fitted with easy-open sheet cover 3 is carried out, which, however, is not shown here.

[0085] After filling, the sheet metal cap 4 is placed on the lower end B of frame 1, and then a flanged joint 12 is made between the sheet metal cap 4 and frame 1, thereby sealing frame 1 tightly at its lower end.

[0086] After closing the filling opening with the metal lid 4, turn the finished tuna can upside down so that the easy-open foil lid 3 is facing upwards and the metal lid 4 forms the bottom of the can 7.

[0087] Although the preferred embodiments of the invention are described in the present application, it should be clearly noted that the invention is not limited to these and can also be implemented in other ways within the scope of the following claims.

Claims (33)

1. CLAIMS 1. A sheet metal container with a foil lid provided with an easy-open strip, comprising a seamless frame (1) manufactured by deep drawing, forming a container wall (6) surrounding the interior space of the container and having a first end (T) and a second end (B), forming the frame (1) at its first end (T) an extraction opening surrounded by a sealing flange (2) closed with an easy-open sheet metal cover (3) glued or sealed onto the sealing flange (2), and the frame (1) being joined at its second end (B) by means of flange to a sheet metal cover (4) that forms the bottom of the container (7). 2. Container according to claim 1, the sealing flange (2) extending radially outwards from the container wall (6) formed by the frame (1). 3. Container according to one of the preceding claims, the sealing flange (2) having a surrounding edge (5) that limits its sealing surface to the outside. 4. Container according to claim 3, the sealing flange (2) and the bottom of the container (7) being configured such that the bottom of the container (7) of a first container can be placed inside the rim (5) that limits the sealing surface to the outside of a second identical container. 5. Container according to one of the preceding claims, the container wall (6) defining an essentially cylindrical interior space of the container (8). 6. Container according to one of the preceding claims, wherein the container wall (6) and the container bottom (7) are made of an identical laminated material, in particular of steel sheet or identical coated aluminum sheet. 7. Container according to one of the preceding claims, the bottom of the container (7) being manufactured from a laminated material by deep drawing. 8. Set of materials for forming containers according to any of the preceding claims, comprising a) seamless frames (1) manufactured by deep drawing for creating the walls (6) of the containers, which respectively form at a first end (T) an extraction opening surrounded by a sealing flange (2) and at a second end (B) a filling opening, and b) sheet metal covers (4) with which the filling openings of the frames (1) can be closed by creating a flanged joint between the respective frame (1) and the respective sheet metal cover (4). 9. Set of materials according to claim 8, the sheet metal covers (4) being manufactured from a drawn sheet metal material that is identical to the material of the frames (1). 10. Set of materials according to claim 9, the extraction openings of the frames (1) being closed respectively with an easy-open sheet cover (3) glued or sealed onto the sealing flange (2). 11. A method for manufacturing a set of materials according to any one of claims 8 to 10, comprising the steps: a) manufacture of identical deep-drawn cup-type containers (9), having respectively a cup opening, a closed cup bottom, a closed cup wall (6) extending between the cup bottom and the cup opening, and a sealing flange (2) surrounding the cup opening; b) separation of the bottoms of the containers (9) so as to obtain first container pieces (10), consisting essentially of the separated bottoms, and second container pieces (11) formed essentially by the respective wall (6) and the sealing flange (2) surrounding the respective opening; c) forming the sheet metal covers (4) from the first container pieces (10) and forming the frames (1) from the second container pieces (11). 12. Method according to claim 11, wherein the bottoms of the glasses are separated from the glass wall (6a) of the respective container in such a way that the piece separated from the glass wall (6a) forms a collar of uniform height surrounding the bottom of the glass. 13. A method according to any one of claims 11 to 12, comprising the step of: sealing or gluing easy-open foil lids (3) onto the sealing flanges (2) of the second container pieces (11; 1), so that the opening of the cup is completely closed by the easy-open foil lid (3). 14. Method according to claim 13, after sealing or gluing, a leak test is performed on the second part of the container (11; 1) provided with the easy-open sheet lid (3). 15. A method according to any one of claims 11 to 14, further comprising the step of: transformation of the collars of the first vessel pieces (10) or of the collars of the first vessel pieces (10) and of the ends (B) of the vessel walls (6b) of the second vessel pieces (11) that form the filling opening, so that these areas can be transformed in a later step to form a flanged joint (12) between one of the first vessel pieces (10; 4) and one of the second vessel pieces (11; 1) in order to close the filling opening of the second vessel piece (11; 1) with the first vessel piece (10; 4). 16. Method according to claim 15, wherein any deformation of the end wall of the cup (6) of the second container piece (11; 1) forming the filling opening is carried out before sealing or gluing the easy-open foil lid (3) to the sealing flange (2). 17. Method according to any one of claims 11 to 16, the sealing flange (2) of the cup-type container (9) being configured so as to extend radially outwards from the opening of the cup. 18. Method according to claim 17, configuring the sealing flange (2) of the cup-type container (9) so as to have a surrounding rim (5) that limits the sealing surface to the outside. 19. Method according to any one of claims 11 to 18, the embedded cup-type containers (9) respectively having an essentially cylindrical cup interior space (8). 20. Method according to any one of claims 11 to 19, wherein the cup-type containers (9) are manufactured from a raw sheet metal sheet, which is stamped at the place of manufacture of the cup-type container (9) from a sheet metal strip, particularly coated, especially of steel or aluminum sheet. 21. Method according to any one of claims 11 to 20, the easy-open foil lids (3) being stamped at the place of manufacture of the cup-type container (9) from a foil strip. 22. A method for manufacturing filled containers according to any one of claims 1 to 7, in particular food containers, comprising the steps: a) manufacture of identical cup-type containers (9) drawn with a cup opening, a closed cup bottom, a closed cup wall (6) extending between the cup bottom and the cup opening, and a sealing flange (2) surrounding the cup opening; b) separating the bottoms of the vessels with a part of the vessel wall (6a) from the respective container (9) so as to obtain a first container piece (10) to create a sheet metal lid (4), which is formed from the separated vessel bottom with the separated part of the vessel wall (6a), the separated part of the container wall (6a) forming a collar of uniform height surrounding the bottom of the container, and obtaining a second container piece (10) to create a frame (1), which is formed from the remaining container wall (6b) and the sealing flange (2) surrounding the opening of the container; c) sealing or gluing easy-open foil lids (3) onto the sealing flanges (2) of the second container pieces (11; 1), so that the opening of the cup is completely closed by the easy-open foil lid (3); d) transformation of the collars of the first vessel pieces (10; 4) or of the collars of the first vessel pieces (10; 4) and the ends (B) of the vessel walls (6b) of the second vessel pieces forming the filling opening (11; 1) so that these areas can be converted in a subsequent step into a flanged joint (12) between one of the first vessel pieces (10; 4) and one of the second vessel pieces (11; 1), so that the first vessel piece (10; 4) closes the filling opening of the second vessel piece (11; 1); e) filling the second container pieces (11; 1) with a filling product (13) after sealing or gluing the easy-open foil lid (3) over the filling opening; f) closing the filling openings of the second filled container pieces (11; 1) with one of the first container pieces (10; 4) by fitting it to the second container piece (11; 1) and creating the flanged joint (12) between the first (10; 4) and the second container piece (11; 1). 23. Method according to claim 22, the filling opening of the second filled container piece (11; 1) being closed with a first container piece (10; 4) that has been previously separated from this second container piece (11; 1). 24. Method according to claim 22, closing the filling opening of the second filled container piece (11; 1) with a first container piece (10; 4) that has been separated from another of the second container pieces (11; 1). 25. A method according to any one of claims 22 to 24, wherein the collar of the respective first container piece (10; 4), used to close the filling opening of the second container piece (11; 1), is transformed during the period in which the eventual transformation of the end (B) of the vessel wall (6b) of the second container piece (11; 1) forming the filling opening, sealing or gluing of the easy-open sheet metal cover (3) over the sealing flange (2) of the second container piece (11; 1) and/or the filling of the second container piece (11; 1). 26. Method according to one of claims 22 to 25, producing the eventual transformation of the end (B) of the cup wall (6b) of the second container piece (11; 1) that forms the filling opening before sealing or gluing the easy-open sheet lid (3) onto the sealing flange (2). 27. Method according to any one of claims 22 to 26, the sealing flange (2) of the cup-type container (9) being designed to extend radially outwards from the opening of the cup. 28. Method according to claim 27, the sealing flange (2) of the cup-type container (9) being designed so as to have a surrounding rim (5) that limits the sealing surface to the outside. 29. Method according to claim 28, the sealing flange (2) and the flanged joint (12) between the first container piece (10; 4) and the second container piece (11; 1) being designed so that the bottom (7) of a first finished container can be placed inside the rim (5) that limits the sealing surface of a second finished container to the outside. 30. Method according to any one of claims 22 to 29, the embedded cup-type containers (9) being configured so as to have an essentially cylindrical cup interior space (8). 31. Method according to any one of claims 22 to 30, wherein the cup-type containers (9) are manufactured from a raw sheet of sheet metal, which is stamped at the container manufacturing site from a sheet metal strip, in particular coated, in particular coated steel or aluminum sheet. 32. Method according to one of claims 22 to 31, the easy-open foil lids (3) being stamped at the container manufacturing site from a foil strip. 33. Method according to one of claims 22 to 32, wherein, before filling the second container pieces (11; 1), a leak test is performed on each second container piece (11; 1) provided with the easy-open foil lid (3).