tank

Abstract

The invention relates to a can, which contains a solid, liquid and / or gaseous medium, which can have an overpressure or can generate such an overpressure during transport or storage, wherein the cylindrical can shell (101) of the can consists mainly of paper or paperboard material and comprises at least two wound layers, is closed at the bottom with a bottom element (4) and at the top with a lid element (5), wherein the innermost layer of the can shell (101) consists of a straight wound barrier layer (102), which has longitudinal seams, which extend in the longitudinal direction of the can (1) as such, which are sealed on the inside by a film layer of the barrier layer (102), which simply overlaps the barrier layer (102) in the area of the longitudinal seams, or which are sealed by sealing strips (110), which extend straight in the longitudinal direction of the can, or which are designed as folding seams, and the inner or outer longitudinal edge of the further layers (103, 104) of the can shell (101) in the form of wound layers made of paper or paperboard material faces the side with the increased thickness as a result of the folding seams.

Description

Technical Field

[0001] This invention relates to a pressure tank with a composite material tank shell. Background Technology

[0002] Pressure tanks are containers used to package media that are under positive pressure, or media that may be under positive pressure during storage, transportation, or use.

[0003] Therefore, this invention relates to a fluid container, particularly a beverage container, which can also be used to dispense canned beverages such as carbonated mineral water, sweetened drinks, energy drinks, or beer, as it is pressure-resistant enough for these purposes. By design, it is suitable for all kinds of aerosol cans with even higher internal pressures. Furthermore, this invention relates to an industrial manufacturing and logistics method utilizing this beverage can, facilitating beverage filling, particularly on-site filling of the container, and enabling production as needed, preferably concurrently with existing filling facilities. Preferably, conventional can filling equipment used to introduce this new fluid or beverage container will not need to alter its can filling facilities but can continue to use them seamlessly. This facilitates their own can production, and the space required for this is a fraction of the space previously essential for buffer storage of empty aluminum cans for subsequent filling.

[0004] In the packaging industry, multilayer packaging is known to have paper or cardboard packaging material, each layer of which is wound directly or obliquely around a mandrel in the longitudinal direction, and thus has self-jointing areas extending longitudinally along the packaging shell, or self-jointing areas extending spirally along the packaging shell. These packages may have an internal barrier layer with dense folded seams in the joint areas at its two edges. Cardboard and paper materials are commonly used as composite layers. Such can shells have been used to date for general packaging purposes, such as for packaging powders, like detergents, cocoa powder, or for snacks, such as chips, where, in relation to food, the barrier layer protects the food from the ingress of liquids and gases from the outside and prevents liquids and gases from escaping from the food or from the interior of the packaging.

[0005] Meanwhile, there are many composite packaging options for food and beverages with can shells made of composite materials. However, they have reached their limits in terms of compressive strength, preventing their use in pressurized media, particularly carbonated beverages. Although such can shells made of composite materials for carbonated beverages have been proposed in patent literature, such as WO9959882A9 and EP0101139A2, no such products have been commercially available to date. This may be because sufficient compressive strength cannot be achieved in the proposed can shells and / or finished cans, or because these proposed can shells and / or finished cans are not competitive with conventional beverage cans, especially aluminum cans.

[0006] The disadvantages of the packaging for carbonated beverages described in WO 9959882 A9 are that they have a special shape, which on the one hand requires their own filling and sealing facilities, and on the other hand deviates from the beverage can form familiar to consumers.

[0007] The disadvantages of the packaging for carbonated beverages described in EP 0101139 A2 are that they have a special shape, which on the one hand requires their own filling and sealing facilities, and on the other hand deviates from the beverage can form familiar to consumers, especially in the areas of the bottom and lid.

[0008] From DE 202007010192 U1, a composite can for carbonated beverages is known, the shell of which is mainly constructed of paper or cardboard material, wherein the wall thickness is 0.5545 mm. A disadvantage of DE 202007010192U1 is that the shell consists of thick sulfate plates coated on its overlapping sides, resulting in sections much wider than the rest of the shell. Another disadvantage is that the transverse edges of the inner and outer edges of the laminated structure are exposed, thus requiring additional sealing, such as by tape.

[0009] WO 2012155890 A1 describes a carbonated beverage packaging having a shell made of a composite material, wherein the shell is primarily composed of paper or cardboard. The shell thickness (or layer thickness) of the composite shell of the can is 0.5-0.8 mm, wherein the thickness of the barrier film is 50-120 μm. A disadvantage of WO 2012155890A1 is that the entire laminated structure overlaps itself, creating sections much wider than the rest of the shell. Another disadvantage is that the lateral edges of the inner and outer edges of the laminated structure are exposed, thus requiring additional sealing, such as with tape.

[0010] A composite can for carbonated beverages is known from US 3687351 A1. The shell of the composite can is mainly composed of paper or cardboard material, wherein the shell thickness is about 0.48 mm. Its disadvantage is that the layer structure is a thick aluminum layer with a layer thickness of about 25 μm.

[0011] US 4642252 describes a carbonated beverage package with a composite shell, wherein the shell may be made primarily of paper or cardboard material. Figure 1 , 8 The shell thickness of the exemplary embodiments of US4642252 is approximately 900 μm, or 0.9 mm, in each case. A disadvantage of US4642252 is that the innermost layer, i.e. the barrier layer, is spirally wound, which increases the length of its folded seams.

[0012] US4766019 discloses a can for carbonated beverages having a shell made of multiple layers of plastic. The shell thickness (or layer thickness) is given in one exemplary embodiment as 22 mils, or approximately 0.56 mm. US4766019 states that the shell thickness should be less than 30 mils (0.762 mm) so that the plastic shell can be sealed with a conventional aluminum cap. A disadvantage is that the shell is made entirely of plastic, which appears to be less durable. In US4766019, the innermost barrier layer is pressed onto a mandrel.

[0013] US4181239A also discloses a can with a plastic shell, wherein the disadvantage is that the can shell is made entirely of a plastic layer. US4181239A specifies that the shell thickness should be between 85 and 770 μm, preferably between 100 and 400 μm.

[0014] Based on existing technology, it is clearly recognized that the can shell must not exceed a certain thickness so that it can still be closed with a standard aluminum can lid, as is the case with conventional aluminum cans. Secondly, it is clearly recognized that, at least in a multi-layered, rolled can shell, the can shell should not exhibit any large deviations in layer thickness along its circumference. To achieve this, the innermost layer is designed to be made of a thin plastic film obtainable from US 4181239A, US 4766019, and US 4642252, or a laminated structure of different plastic films and, possibly, aluminum foil. US 4642252 also proposes a barrier laminated structure made of plastic film and aluminum foil, with spiral folded seams laminated through a paper intermediate layer.

[0015] US2020189791A1 discloses a can containing a liquid and / or gaseous medium, the can having overpressure or generating overpressure during transport or storage, the cylindrical can sleeve of the can being primarily made of paper or cardboard material and being closed by a bottom element at the bottom and a lid at the top, the can being able to withstand an internal pressure of at least 5 bar, the innermost layer of the can sleeve being composed of a straight-wound barrier layer having folded seams extending longitudinally along the can itself, the barrier layer being a prefabricated laminate of an inner anti-diffusion barrier membrane or an inner anti-diffusion barrier laminate and a kraft paper outer layer.

[0016] It has been proven disadvantageous that, in the case of paper or paperboard composite cans made from rolled monolayers, the retaining effect between the individual layers (i.e., the barrier laminate structure of plastic film and optional aluminum foil with subsequent layers of paper or paperboard material) may be insufficient for use as a pressurized medium, particularly for carbonated beverages, especially in the area of ​​fold seams. Summary of the Invention

[0017] The object of the present invention is to further improve commercially available can shells made of composite materials for cans used for pressurized media, particularly carbonated beverages, which reliably withstand the internal pressure present or potentially present with such media and are primarily composed of paper or cardboard materials.

[0018] To achieve this objective, in one embodiment, a can is provided containing a solid, liquid, and / or gaseous medium, the liquid and / or gaseous medium having or being able to generate positive pressure during transport or storage, wherein the cylindrical can shell of the can is primarily composed of paper or cardboard material and includes at least two wound layers and is closed at the bottom with a bottom element and at the top with a cap element, wherein the innermost layer of the can shell consists of a linearly wound barrier layer having a longitudinal seam extending itself in the longitudinal direction of the can, wherein the barrier layer is sealed by one of the following options:

[0019] - The longitudinal seams are sealed on the inside by a thin film layer of the barrier layer, which simply overlaps with the barrier layer in the region of the longitudinal seams, or

[0020] - The longitudinal joints are sealed by a sealing strip extending in a straight line in the longitudinal direction of the tank, or

[0021] - A longitudinal seam is a folded seam, and the inner or outer longitudinal edge of another layer of the can shell in the form of a rolled layer of paper or cardboard material faces the side edge where the thickness increases due to the folded seam.

[0022] To achieve this objective, another embodiment provides a can containing a solid, liquid, and / or gaseous medium that may be overpressurized or may generate such pressure during transport or storage. The cylindrical can shell is primarily made of paper or cardboard material. The can shell has a barrier layer on the inner side, a barrier layer on the outer side, and includes at least two wound intermediate layers made of paper or cardboard material between them. The can shell is closed at the bottom with a bottom element and at the top with a cap element. The innermost layer of the can shell consists of a straight wound barrier layer having a longitudinal seam extending in the longitudinal direction of the can. The longitudinal seam forms an increase in thickness in the layer structure. The inner or outer longitudinal edge of at least one intermediate layer faces the side edge of the increased thickness due to the longitudinal seam.

[0023] One embodiment provides that the inner longitudinal edge of at least one additional layer of the tank shell faces the side edge with increased thickness due to the longitudinal joint, and the outer longitudinal edge of the layer overlaps with the inner longitudinal edge of the layer.

[0024] One embodiment proposes that the inner longitudinal edges of at least two additional layers of the tank shell each face the side edge with increased thickness due to the longitudinal joint, and the outer longitudinal edge of the respective layer overlaps with the inner longitudinal edge of that layer.

[0025] One embodiment proposes that the barrier layer is a laminated structure made of an inner anti-diffusion film or an inner anti-diffusion barrier laminate structure and an outer cardboard or paper or kraft paper layer, the barrier layer having a first edge region that overlaps with a second edge region of the barrier layer in the region of the longitudinal seam.

[0026] One embodiment proposes that the barrier layer in the first edge region includes an inner anti-diffusion film or an inner anti-diffusion laminate structure and an outer cardboard or paper or kraft paper layer, and the inner edge of the first edge region is sealed by a sealing strip.

[0027] One embodiment proposes that the barrier layer includes only an internal anti-diffusion membrane or an internal anti-diffusion barrier laminate in the first edge region or at least in the outer region of the first edge region, wherein the internal anti-diffusion membrane or internal anti-diffusion barrier laminate in the first edge region abuts against the internal anti-diffusion membrane or internal anti-diffusion barrier laminate in the second edge region.

[0028] One embodiment proposes that the barrier layer in the second edge region, or at least in the outer region of the second edge region, consists only of cardboard or paper or kraft paper layers.

[0029] One embodiment proposes that the cardboard, paper, or kraft paper layers of the barrier layer do not overlap.

[0030] One embodiment proposes that the barrier layer consists of cardboard, paper, or kraft paper layers that overlap themselves.

[0031] One embodiment proposes that the longitudinal seam of the barrier layer extending in the longitudinal direction of the can has an increased thickness, and the inner or outer longitudinal edge of the layer of the can shell in the form of a wound layer of paper or paperboard material following the barrier layer faces the side edge with increased thickness.

[0032] One embodiment proposes that the longitudinal seam of the barrier layer extending in the longitudinal direction of the can has an increased thickness, and subsequent layers of the can shell in the form of a wound layer of paper or paperboard material are arranged around the barrier layer, such that the increased thickness due to the longitudinal seam is also present in the subsequent layers, with the inner or outer longitudinal edge of the wound layer of paper or paperboard material facing the side edge of the next subsequent layer of the can shell following the subsequent layer with the increased thickness.

[0033] One embodiment proposes that the two longitudinal edges of one of the two subsequent layers of the tank shell face two opposing side edges with increasing thickness.

[0034] One embodiment proposes that the outer sides of two longitudinal edges of at least one of two subsequent layers of the tank shell overlap with the inner sides of two longitudinal edges of the same layer.

[0035] One embodiment proposes that each of the two subsequent layers of the tank shell overlaps itself and exists in the region of self-overlap without a reduction in thickness, with the inner longitudinal edge of the corresponding layer facing the side edge with increased thickness.

[0036] One embodiment proposes that the barrier layer itself consists of one or more film layers and has no cardboard, paper or kraft paper layers, and the barrier layer simply overlaps itself in the longitudinal seam area.

[0037] One embodiment proposes that the barrier layer is a laminated structure of an inner anti-diffusion film or an inner anti-diffusion barrier laminate and an outer cardboard, paper or kraft paper layer, wherein the two edges of the barrier layer meet at the longitudinal seam area to form a butt joint, and the butt joint area is sealed with a sealing strip.

[0038] One embodiment proposes that the barrier layer is a lamination mechanism of an inner anti-diffusion film or an inner anti-diffusion barrier lamination mechanism and an outer cardboard or paper or kraft paper layer, wherein at least one layer of the anti-diffusion film or barrier lamination mechanism is formed in a U-shape around the inner cut edge of the cardboard or paper or kraft paper layer, or a sealing strip is placed in a U-shape around the inner cut edge of the barrier layer.

[0039] In one embodiment, the barrier layer is proposed to be an inner anti-diffusion film or an inner anti-diffusion barrier layer laminated with an outer cardboard or paper (especially kraft paper), wherein at least one additional layer of paper or cardboard material exists around the barrier layer, wherein the cardboard or paper surfaces of the barrier layers that are in contact with each other and the additional paper or cardboard material winding layers are directly adhered to each other, particularly glued.

[0040] If the barrier layer is formed as a laminate of film and cardboard or paper (especially kraft paper), the film is not stressed, especially in the overlapping areas of the longitudinal seams, because the tension is dissipated by the cardboard or paper (especially kraft paper), where the tensile force acts advantageously in the circumferential direction due to the direct seam, and no additional force is introduced in the longitudinal direction of the can, as is the case in the case of the innermost layer or the barrier layer being spirally wound.

[0041] If the innermost layer is made of paper material on the outside and the next layer is also made of paper material, these two paper materials can be directly bonded to each other, especially glued, so that the adhesive can penetrate into the fibers of the paper materials on both sides, and thus the fibers of one paper layer are directly bonded to the fibers of the other paper layer by the adhesive. The advantage of this is that the bond is particularly strong, which cannot be achieved in this way if there is a plastic barrier layer between the paper materials.

[0042] The barrier layer preferably has a thickness of 0.060 mm to 0.145 mm. The kraft paper layer of the barrier layer preferably has a thickness of 0.065 mm to 0.090 mm. The kraft paper layer of the barrier layer preferably has a tensile strength MD of at least 4.0 kN / m and a tensile strength CD of at least 2 kN / m. Preferably, the anti-diffusion barrier film or anti-diffusion barrier laminate has a thickness of 0.033 mm to 0.055 mm.

[0043] Preferably, the barrier laminate structure includes an aluminum layer and at least two plastic layers, wherein the aluminum layer is present between the two plastic layers.

[0044] Preferably, at least two additional cardboard or paper layers, particularly kraft paper layers, rolled separately from each other, are placed above the barrier layer.

[0045] The tank is preferably designed to withstand an internal pressure of at least 5 bar.

[0046] In a less preferred embodiment, the at least two cardboard or paper layers, particularly kraft paper layers, do not overlap, or have at least one edge region with reduced thickness in the area where they overlap.

[0047] Preferably, the thicknesses of the at least two additional paperboard or paper (especially kraft paper) layers are selected from the range of 140 μm to 175 μm. The tensile strengths of the kraft paper layers are preferably at least 10 kN / m (MD) and at least 5 kN / m (CD).

[0048] Preferably, the other kraft paper layers and / or other paper or paperboard material layers are each wound longitudinally. Preferably, their joining or overlapping areas are located in different peripheral areas, or the mutually facing joining edges of the two paperboard or paper (especially kraft paper) layers are preferably staggered.

[0049] Preferably, the joint or overlapping areas of the cardboard or paper (especially kraft paper) layers adjacent to the barrier layer are staggered relative to the longitudinal seams of the barrier layer.

[0050] Preferably, the can has an external sealing layer applied from the outside to a layer of cardboard or paper (especially kraft paper), which may be present, for example, as a film, a laminate, or coated paper. Preferably, the barrier layer, preferably at least two additional layers of cardboard or paper (especially kraft paper), and preferably the external sealing layer are processed by a winding system to continuously form a hollow tube from which individual hollow cylinders are cut.

[0051] Alternatively, the outermost layer of at least two cardboard or paper (especially kraft paper) layers may exist as a laminate of cardboard or paper (especially kraft paper) layers and a barrier film before winding, wherein the barrier film is located on the outside of the composite can shell after winding occurs.

[0052] The outer barrier membrane or outer sealing layer on the outside of the composite tank shell can be a semi-permeable membrane that allows moisture to escape from the tank shell but does not allow moisture to enter the tank shell from the outside.

[0053] The material of the outer barrier membrane or outer sealing layer on the outside of the composite tank shell can be recyclable or renewable PE, biodegradable PE, EVOH or other known barrier materials.

[0054] In an alternative embodiment, the outer sealing layer is attached only after the individual hollow bodies are cut. This can be achieved by pulling tubular sleeves of the external moisture-proof material onto the individual hollow bodies and securing them thereto. Preferably, shrink tubes formed from shrink film are pulled over the cylindrical hollow bodies and formed on the can shell by heating and a associated reduction in diameter. Preferably, the two cut edges of the hollow bodies are covered by tubular sleeves to prevent moisture penetration. The placement of the shell or shrink tubes is advantageously performed before the two ends of the individual hollow bodies are formed outwards. The shell or shrink tubes can be glued or formed onto the hollow bodies before or during the molding of the ends. However, placement or inward rotation onto the hollow bodies can also be performed after the two ends of the individual hollow bodies are formed outwards.

[0055] Covering the cut edge of a hollow body with a tubular sleeve involves wrapping the tubular sleeve around the cut edge and extending it into the interior of the hollow body. Preferably, the tubular sleeve extends at least 3 mm, particularly at least 4 mm, into the interior of the hollow body at both ends. Advantageously, the tubular sleeve can be welded to the barrier layer or barrier laminate structure in the overlapping area within the hollow body.

[0056] The tubular sleeve comprises or is composed of a plastic film. The plastic film is preferably composed of polyolefin.

[0057] The tubular sleeve can be a shrink sleeve or a stretch sleeve.

[0058] The paper layer of the hollow body located below the tubular sleeve is preferably printed. Printing can be performed before winding the paper layer, or after winding on the tubular body, on the annular tube already on the winding machine mandrel, or after the annular tube has been cut from a single hollow body. However, printing can also be located inside and / or outside the tubular sleeve.

[0059] The tubular sleeve is preferably attached to the end of the conveying path of a single hollow body cut from the annular tube, to a nearly or completely dried hollow body. The hollow body preferably moves continuously along the conveying path. The drying device may be arranged along the conveying path, or the conveying path may pass through at least one drying device. Less preferably, the hollow bodies may be temporarily stored until they are fully dried, for example, within the drying device.

[0060] Subsequently, the tubular sleeve is drawn longitudinally onto one or more hollow bodies, or one or more hollow bodies are pushed longitudinally into the tubular sleeve. The tubular sleeve protrudes beyond each tank shell at both ends, where it is folded inward and bonded or preferably welded to the barrier layer (liner) of the tank shell. The tubular sleeve can be supplied individually or as a continuous tube, in which case the continuous tube is cut at a position after the respective tank shell has been inserted.

[0061] After the individual hollow bodies are cut out, an outer sealing layer can also be applied by coating them or by wrapping them with a film. In this case, the two cut edges of the hollow bodies are also preferably covered by the coating or film.

[0062] If the outer side of the layered structure has already been sealed in the winding system, and the layered structure on the two cut edges of the hollow body cannot dry sufficiently due to the materials used, especially the adhesive and the amount applied, it is particularly advantageous to apply an external sealing layer after cutting each hollow body.

[0063] As an alternative to an outer barrier layer in the form of a film, the outermost layer of at least two cardboard or paper (especially kraft paper) layers may be coated with a barrier material, such as a coating, on one side of the latter outer layer before winding.

[0064] Less preferably, barrier materials such as coatings can be applied to the outside of hollow tubes or separate hollow cylinders after production.

[0065] For example, water-based polymer coatings or UV coatings can be used as paints.

[0066] Preferably, the cut edges of the individual hollow cylinders are sealed, for example, by applying a tape or film, or by coating a barrier material (e.g., paint, waterproof adhesive, or liquid plastic), exposing the paper material of the cardboard or paper (especially kraft paper) layer at the cut edges. Particularly preferably, the cut edges are sealed by impregnation, i.e., by applying a liquid that penetrates or slightly absorbs from the fibrous matrix of the cardboard or paper (especially kraft paper) layer at the cut edges, thereby forming a liquid-resistant edge region in the cardboard or paper (especially kraft paper). This impregnation can also be used if the outermost layer of the can has one (in the case of overlap) or two (in the case of butt joints) exposed longitudinal absorbent edges.

[0067] For impregnation, polymer mixtures in the form of aqueous solutions or emulsions are preferred.

[0068] Preferably, the cut edges of each hollow cylinder are curved outward to facilitate placement of the bottom element and the cap, or to improve the constraint of the bottom element and the cap on the hollow cylinder.

[0069] In one embodiment, a coating in a liquid or gaseous aggregated state, or as plasma, is applied to the barrier layer. In another embodiment, the coating is applied after being wound into a formed hollow body.

[0070] Coatings containing silicon oxide (SiOx) are particularly preferred. Such coatings, especially those containing SiOx, are particularly advantageous in embodiments where the barrier layer does not form a folded joint with itself (i.e., for example, has a simple overlap or butt joint with itself).

[0071] Instead of silicon oxide (SiOx) or in addition to silicon oxide (SiOx), the barrier layer may also include another oxide layer, particularly another half-metal oxide layer or metal oxide layer.

[0072] In a preferred embodiment, a coating consisting of or containing nanocellulose (particularly microfibrillated cellulose (MFC)) is performed. The paperboard or paper material (particularly kraft paper) of the barrier layer preferably contains nanocellulose, particularly microfibrillated cellulose (MFC). Nanocellulose (particularly microfibrillated cellulose (MFC)) can be used in this invention as a film in plastic films or paper materials (and therefore also in other layers of paperboard or paper, particularly kraft paper) to increase barrier properties and / or strength.

[0073] The present invention preferably enables the sealing of the can shell with a standard lid of an aluminum can, and filling and sealing the can is also possible in the standard filling of aluminum cans, because the can shell does not exceed the required maximum layer thickness, and the barrier layer still has an allowable shell thickness deviation in the area of ​​the longitudinal seam.

[0074] Advantageously, for the production of hollow cylinders, when the layers of the can shell according to the invention are supplied around a mandrel and preferably glued together over the entire surface, known winding mandrel systems can be used with circular winding mandrels. Therefore, for the production of the can shell according to the invention, standard facilities for continuous operation can be used with minimal modification. The circular structure of the can according to the invention is desirable so that it can be closed with a standard can lid, and the cylinder is more pressure-resistant than other shapes, such as approximately rectangular bodies with rounded corners, which is very common for general packaging purposes.

[0075] Advantageously, the composite can shell structure according to the invention allows for the factory production of airtight containers previously used for packaging conventional consumer goods. Surprisingly, it has been shown that the operating speed of known facilities can be advantageously increased by using a barrier layer made of a paperboard or paper (particularly kraft paper) layer of preferred thickness according to the invention and a barrier film or barrier laminate structure, because elongation of the barrier film or barrier laminate structure at the mandrel is prevented, which is much stronger in linear winding than in spiral winding.

[0076] Instead of winding at least two other cardboard or paper (especially kraft paper) layers in the same manner as the barrier layer in the longitudinal direction of the mandrel, the at least two other kraft paper layers can also be wound obliquely around the straight-wound barrier layer, wherein displacement and chamfering or grading of the edge areas of the kraft paper can occur. The oblique winding of the at least two additional kraft paper layers can be performed in the same direction for each layer, or opposite to each other. However, this variation with obliquely wound additional kraft paper layers has the disadvantage that the joint or overlapping areas of the kraft paper layers intersect with the longitudinal seam of the barrier layer, resulting in potential weaknesses at these locations. In the case of reverse winding, the joint or overlapping areas of the at least two kraft paper layers also intersect, making weaknesses potentially generated there as well.

[0077] Therefore, preferably, at least two other layers of cardboard or paper (especially kraft paper) are also wound in a straight line.

[0078] Less preferred or potentially advantageous modifications derived from the invention can be provided, since paper or kraft paper webs laminated with plastic (especially PE) are used on one or both sides, instead of cardboard or paper (especially kraft paper) layers, and the layers are joined together by welding adjacent plastic layers of two layers together. Thus, at least one layer will have an outer PE film and at least one other layer will have an inner PE film, which are welded together when these layers are applied, particularly on a mandrel in a winding machine, especially by ultrasonic welding. Of course, all layers with plastic-plastic (PE-PE) welding can be fixed together. To achieve this alternative embodiment, theoretically, plastic film can be used instead of adhesive in at least one or all parts of this specification, where adhesive for bonding two surfaces is mentioned, which in each case are laminated to surfaces to be otherwise bonded and welded together. PE-PE welding is common in the manufacture of beverage cartons, where beverage cartons have the disadvantage that they are unsuitable for carbonated beverages or media with or developing strong positive pressure. The layered structure of a beverage carton (barrier layer (PE or PE-Alu-PE)-paper-plastic layer (PE)) can theoretically be used as the innermost longitudinal seam with a can layer (simply overlapping or folding the seam with the usual inner strip in a beverage carton) so that at least one additional layer with an inner plastic layer (PE) and an outer cardboard or paper layer is wound around it, wherein the outermost layer of the layered structure has, for example, an outer barrier layer made of PE. However, unlike conventional beverage cartons, the layered structure can be cylindrical and closed with suitable closure elements (can bottom and can lid), rather than welding the layered structure to itself at the ends. Attached Figure Description

[0079] This invention is described with reference to the accompanying drawings:

[0080] Figure 1 An exploded view of a fluid container according to the invention, in the form of a beverage can, is shown according to a first embodiment.

[0081] Figure 2 : Shows crossing Figure 1 A schematic cross-sectional view of a beverage can made of two layers, shown in a greatly enlarged form.

[0082] Figure 3 A schematic cross-sectional view of the beverage can through the second and third embodiments according to the diagram is shown at a significantly enlarged layer.

[0083] Figure 4 The diagram shows a schematic cross-sectional view through a beverage can having a first layer with a barrier layer on its inner side, wherein two edge regions of the first layer overlap with the winding, are guided to the outside, and are then welded to these barrier layers, and then glued to the winding layer by means of adhesive.

[0084] Figure 5 The diagram schematically illustrates the manufacturing process of a cylindrical tank shell.

[0085] Figure 6 The diagram schematically illustrates the curvature of the tank shell edge.

[0086] Figure 7 The arrangement of the enclosed elements is shown schematically.

[0087] Figure 8 : This shows another variation of the preformed profile in a diameter segment with a silicone-based sealing ring;

[0088] Figure 9 The image shows a longitudinal cross-sectional front view of the finished can, with the tightly rolled edges located at the bottom and on the lid.

[0089] Figure 10 The illustration schematically shows a first part of a facility according to the invention for filling paperboard or paper composite can shells and / or aluminum can shells.

[0090] Figure 11 The diagram schematically illustrates a second part of a facility according to the invention for filling paperboard or paper composite can shells and / or aluminum can shells.

[0091] Figure 12 The diagram schematically illustrates a third part of a facility according to the invention for filling paperboard or paper composite can shells and / or aluminum can shells.

[0092] Figure 13The image shows a longitudinal section through a first embodiment of the cylindrical tank shell according to the invention.

[0093] Figure 14 The layer structure of the first embodiment is shown in a detailed view through a longitudinal section.

[0094] Figure 15 The layer structure of the first embodiment is shown in a detailed view of a cross-section through the longitudinal seam of the barrier layer.

[0095] Figure 16 : A longitudinal section through a second embodiment of the cylindrical tank shell according to the invention is shown.

[0096] Figure 17 The layer structure of the second embodiment is shown in a detailed view of a longitudinal section.

[0097] Figure 18 The layer structure of the second embodiment is shown in a detailed view of a cross-section through the longitudinal seam of the barrier layer.

[0098] Figure 19 The image shows a longitudinal section of a third embodiment of the cylindrical tank shell according to the present invention.

[0099] Figure 20 : A detailed view of the longitudinal section of the layered structure of the third embodiment is shown.

[0100] Figure 21 The layer structure of the third embodiment is shown in a detailed view of a cross-section through the longitudinal seam of the barrier layer.

[0101] Figure 22 The image shows a longitudinal section of a fourth embodiment of a cylindrical tank shell according to the present invention.

[0102] Figure 23 The layer structure of the fourth embodiment is shown in a detailed view of a longitudinal section.

[0103] Figure 24 The layer structure of the fourth embodiment is shown in a detailed view of a cross-section through the longitudinal seam of the barrier layer.

[0104] Figure 25 The image shows a longitudinal section of a fifth embodiment of a cylindrical tank shell according to the present invention.

[0105] Figure 26 The layer structure of the fifth embodiment is shown in a detailed view of a longitudinal section.

[0106] Figure 27 The layer structure of the fifth embodiment is shown in a detailed view of a cross-section through the longitudinal seam of the barrier layer.

[0107] Figure 28 The image shows a longitudinal section of a sixth embodiment of a cylindrical tank shell according to the present invention.

[0108] Figure 29 The image shows a longitudinal section of a seventh embodiment of a cylindrical tank shell according to the present invention.

[0109] Figure 30 The layer structure of the seventh embodiment is shown in a detailed view of a longitudinal section.

[0110] Figure 31 The layer structure of the seventh embodiment is shown in a detailed view of a cross-section through the longitudinal seam of the barrier layer.

[0111] Figure 32 A detailed view of the cross-section through the longitudinal seam of the barrier layer shows the layer structure of the cylindrical tank shell according to the invention, with a sealing strip on the outer seam.

[0112] Figure 33 The diagram illustrates the possible overlapping areas of the layers.

[0113] Figure 34 The image shows a longitudinal section of an embodiment of an additional layer structure for a cylindrical tank shell with adjacent barrier layers.

[0114] Figure 35 The image shows a longitudinal section of another embodiment of an additional layer structure for a cylindrical tank shell with adjacent barrier layers.

[0115] Figure 36 The first embodiment is shown, wherein the edge of the barrier layer forms a butt joint, and another layer is located on it.

[0116] Figure 37 The second embodiment is shown, wherein the edge of the barrier layer forms a butt joint, and another layer is located on it.

[0117] Figure 38 The third embodiment is shown, wherein the edge of the barrier layer forms a butt joint, and another layer is located on it.

[0118] Figure 39 The fourth embodiment is shown, wherein the edge of the barrier layer forms a butt joint, and another layer is located on it.

[0119] Figure 40 The fifth embodiment is shown, wherein the edge of the barrier layer forms a butt joint, and another layer is located on it.

[0120] Figure 41 The sixth embodiment is shown, wherein the edge of the barrier layer forms a butt joint, and another layer is located on it.

[0121] Figure 42 The seventh embodiment is shown, wherein the edge of the barrier layer forms a butt joint, and another layer is located on it.

[0122] Figure 43 The first embodiment is shown, wherein the thickness of the first intermediate layer is increased.

[0123] Figure 44 The second embodiment is shown, wherein the thickness of the second intermediate layer is increased.

[0124] Figure 45 The first embodiment with a self-overlapping intermediate layer is shown.

[0125] Figure 46 A second embodiment with a self-overlapping intermediate layer is shown.

[0126] Figure 47 The third embodiment with a self-overlapping intermediate layer is shown.

[0127] Figure 48 An example of a U-shaped seal with a barrier layer is shown.

[0128] Figure 49 An example of a U-shaped seal with a barrier layer is shown. Detailed Implementation

[0129] Before discussing the various figures, the fluid container according to the invention should be generally described as follows: the fluid container (particularly its design as a beverage can) is designed as a pressurized container and for this purpose has a hollow cylindrical can body, the body comprising an interior for receiving the beverage, a bottom member, and a lid member, wherein the bottom member closes a first longitudinal end of the formed hollow cylindrical can body and the lid member closes a second longitudinal end of the hollow cylindrical can body. The can body encloses at least one wound inner material layer and a wound outer material layer, i.e., at least two wrappers or layers of cardboard composite material or kraft paper, wherein these layers extend precisely 360°, or in another embodiment, extend slightly beyond the entire wrapper. Combinations of layers having exactly one wrapper length and layers having slightly more wrapper lengths are possible. These layers are preferably wound perpendicular to the axis of the can body to be produced, thereby producing maximum compressive strength, because the necessary overlap and therefore the seam has a minimum length. However, a spiral winding with the longitudinal edges of the wound strip joined together to form a tight overlap and seam requires a longer seam. This type of winding is also known as spiral winding, and so far it has been found on cylindrical benchtop bombs or containers for stacking sheets, or as containers for all kinds of other suitable goods. The inner material layer of the wound, according to the invention, of a pressure-resistant and preferably heat-resistant can, has an axially extending internal seam and is formed of a cardboard composite or kraft paper layer, which is preferably coated only on the side facing the inside of the can with an airtight and odor-resistant barrier composite material, and the outer material layer of the wound has an external seam and is preferably formed of a kraft paper layer, wherein the seam formed by overlapping is preferably offset about the circumference of the can relative to the seam of the inner material layer. In the presence of a third cardboard composite layer, the overlap or seam of this third cardboard composite layer is preferably again offset about the circumference of the can relative to the seam of the central layer.

[0130] This fluid container provides beverage containers or cylindrical beverage cans in a simple and low-cost manner, characterized by its simple structure and the use of recyclable materials. Such beverage cans can be surprisingly designed and manufactured to have sufficient pressure resistance, particularly through their composition of several layers and a covering, making them suitable for both carbonated and non-carbonated beverages and capable of withstanding pressures up to 11 bar, despite being primarily made of bare cardboard composite material. Except for a minimal internal coating or barrier layer, the shell is mainly composed of cardboard or kraft paper. This beverage can is food-safe. The can body according to the invention comprises cardboard or even paper, i.e., kraft paper, and is no longer aluminum. A perfectly dense barrier against vapor, aroma, fat, and oxygen is created by sealing the inner material layers with a barrier composite. This barrier composite material is applied, for example, by hot casting in an extruder. The material used for the barrier composite material is a polyolefin layer and at least one adhesive layer. If desired, an additional aluminum layer can be used, in which case the total surface weight of the innermost layer can be approximately 60 g / m². 2 Up to 130g / m 2 In another alternative, the barrier composite material can additionally include an ethylene-vinyl alcohol copolymer layer, thereby achieving 50 g / m³. 2 Up to 100g / m 2 Total surface weight.

[0131] The outer material layer, consisting of kraft paper, is preferably coated with a polyolefin layer on the side furthest from the inside of the can. This polyolefin layer has a basis weight of at least 10 g / m². 2 And at most 50g / m 2 It is composed of polyethylene (PE) or polyethylene terephthalate (PET). An ideal basis weight has been found to be 20 g / m³. 2 In this case, the advantageous barrier properties of polyethylene terephthalate (PET) can be utilized. Therefore, such beverage cans can make a significant contribution to environmental protection and waste reduction.

[0132] Considering that beverage cans are used as packaging and therefore require external labeling of the contents, the kraft paper layer of the outer material is formed on the outer side facing away from the can's interior for waterproof printing or painting. This allows for an outer surface with printed or painted advertising messages. The wound inner and outer material layers are preferably glued together over the entire surface. This ensures that the seams remain relatively staggered relative to the can's circumference and improves compressive strength.

[0133] To increase the stability of the fluid container or beverage can in an environmentally friendly manner, it is advantageous to manufacture triple packaging by applying at least one wound intermediate material layer between the wound inner material layer and the wound outer material layer. This intermediate material layer is also formed of kraft paper, wherein the inner material layer, at least one intermediate material layer, and the outer material layer are bonded to opposing kraft paper layers over the entire surface. The at least one wound intermediate material layer has an intermediate seam, which is preferably offset relative to the inner and outer seams about the circumference of the winding. This staggered arrangement of the inner seam, intermediate seam, and outer seam has proven particularly advantageous in terms of tightness and pressure resistance for filling carbonated beverages.

[0134] Particularly advantageous are barrier composites with the innermost layer of a polyolefin layer and at least one layer of an adhesion promoter. To increase the mechanical stability of the inner material layers while achieving particularly high compressive strength, for pressures of 11 bar and higher, the barrier composite can additionally include an aluminum layer and at least 60 g / m² of... 2 and up to 130g / m 2 The total weight. However, by selecting materials, the weight of the fluid container increases only slightly, while the internal material layers gain toughness through appropriate material selection.

[0135] Alternatively, to improve the mechanical stability of the barrier composite material, an ethylene-vinyl alcohol copolymer layer can be used instead of a single layer of aluminum, with a total basis weight of at least 50 g / m². 2 and at most 100g / m 2 The ethylene-vinyl alcohol copolymer also possesses the properties required for forming a barrier layer. In another alternative embodiment with increased mechanical stability, it further has a content of at least 50 g / m³. 2 and at most 100g / m 2 A polyvinyl alcohol layer of total weight can be used as a barrier composite material. In this case, polyvinyl alcohol exhibits high tensile strength and flexibility.

[0136] Considering the low total weight of the fluid container, the basis weight is at least 60 g / m³. 2 And at most 180g / m 2 A kraft paper layer is suitable. The bottom element and / or lid element can be manufactured for good pressure resistance in the metal can, which is preferably made of aluminum, as is conventional.

[0137] The various figures will be described and explained in detail below. Figure 1The fluid container in the form of a beverage can 1 according to the invention is illustrated schematically as a single component. The beverage can 1 includes a tubular or hollow cylindrical can body 2 having an interior 3 for containing a beverage, a bottom element 4, and a lid element 5. The bottom element 4 is used to close a first longitudinal end 6 of the can body 2, and the lid element 5 is used to close a second longitudinal end 7 of the can body 2. The bottom element 4 and the lid element 5 are preferably made of metal, preferably aluminum. The beverage can 1 can have a height of 100 mm to 250 mm and a diameter of 35 mm to 600 mm, wherein a height of 100 mm and a diameter of 45 mm to 70 mm are preferred.

[0138] Figure 2 A first variant of the can body with two layers in cross-section is shown, in principle illustrating a significantly enlarged number of layers. A first kraft paper layer 18, having a coaxial polyolefin layer as a barrier composite material, is wound around an inner layer 11 around a central cylindrical steel mandrel and has a first seam 15, with its edges in the winding direction glued or welded. Subsequently, a second kraft paper layer 18 is wound onto the first layer 11 as an outer material layer 12, such that the edges in the winding direction are welded or glued to form a seam 16 on the side of the can body 2 opposite to the seam 15, thereby forming a can body 2 with a hollow can body interior 3.

[0139] exist Figure 3 The second embodiment of the beverage container 1 is shown in the cross-section penetrating the can 2, thus demonstrating that... Figure 2 The difference between this second embodiment and the first embodiment is that, in this second embodiment, the tank 2 has a structure with three layers of materials 11, 14, and 12, instead of just two layers. The following description applies to both embodiments and mentions the differences between them.

[0140] exist Figure 2 and Figure 3 In the two embodiments shown, the tank 2 includes a wound inner material layer 11 and a wound outer material layer 12. According to... Figure 3 In the second embodiment, there is another material layer, namely a wound intermediate material layer 14, which is arranged between the inner material layer 11 and the outer material layer 12. More than one intermediate material layer 14 may also be arranged between the inner material layer 11 and the outer material layer 12, wherein it has been shown that three intermediate material layers 14 represent a maximum value and there is no need to further increase the number of intermediate layers to increase stability.

[0141] The inner material layer 11, the outer material layer 12, and the intermediate material layer 14 in the second embodiment are unwound from the material fiber roll. Then, preferably in a machine, their edge regions are ground to form inclined surfaces or steps, such that the edge regions of subsequent overlaps are not thicker than the edge regions of the cardboard composite layer itself. Subsequently, the material fiber roll is wound transversely to its route direction and perpendicular to the can body 2 around the mandrel 23 for the production of the can body 2 and the subsequently sealed can 1. The overlapping edge regions of the individual material layers are then glued together in a form-fitting manner. Thus, the wound inner material layer 11 has an inner seam 15, while the outer material layer 12 has an outer seam 16. Therefore, in the second embodiment, the intermediate material layer 14 has an intermediate seam 17.

[0142] For the sake of the functionality and aesthetics of fluid containers, especially beverage cans, it is advantageous that the various seams 15, 16 and optionally 17 are not arranged in the same circumferential position, such as... Figure 3 As shown, it is arranged on the internal joint 15. Figure 2 The outer seam 16 in the first embodiment and Figure 3 In the second embodiment, the intermediate seam 17 is additionally arranged at different circumferential positions after the material layers 11, 12 and optional 14 are glued together. For example... Figure 2 As shown, regardless of whether the inner joint 15 is offset by 180° relative to the outer joint 16, or as... Figure 3 As shown, seams 15, 16, and 17 are offset from each other by only about 15°, which is not significant. Advantageously, seams 15, 16, and optionally 17 are arranged to be offset from each other and not located at the same circumferential position on the tank body 2.

[0143] As a substrate, the inner material layer 11 and the outer material layer 12 are each formed of kraft paper layers 18, wherein, if present, the intermediate material layer 14 is formed of kraft paper layers 18. In this case, each kraft paper layer 18 preferably has a g / m² content of at least 40 g / m³. 2 and up to 180g / m 2 The weight, preferably at least 80 g / m³ 2 and up to 120g / m 2 The basis weight. As an alternative substrate, bag paper with high tensile strength was also considered.

[0144] In both embodiments, according to Figure 2 and Figure 3 The outer material layer 12 has a kraft paper layer 18 coated with a polyolefin layer 19 as a barrier compound on the side facing away from the outer surface of the can interior 3. This two-layer structure of the outer material layer 12 is schematically represented by dashed lines, wherein... Figure 2 and Figure 3The representation does not reflect the actual layer thickness. The polyolefin layer 19 preferably has a thickness of at least 10 g / m². 2 And at most 40g / m 2 The preferred weight is 20 g / m³. 2 The basis weight. Furthermore, the polyolefin layer 19 may or may not be semi-permeable. As an alternative to the polyolefin layer 19 (not shown), the kraft paper layer 18 of the outer material layer 12 may be printed or painted on one side of the outer surface opposite to the can interior 3.

[0145] Furthermore, in both embodiments, according to Figure 2 and Figure 3 The inner material layer 11 is coated with an airtight and flavor-tight barrier composite material 20 on one side of the side surface facing the interior of the can 3. Similarly, the two-layer structure is schematically represented by dashed lines in the various figures. The barrier composite material 20 can be multi-layered.

[0146] The inner material layer 11 may be coated with an airtight and odor-proof layer on the side facing the interior of the tank 3. Here, the two-layer structure is also schematically represented by dashed lines in the corresponding figures. This layer is preferably applied by spraying, printing, or coating (e.g., plasma coating). This layer particularly preferably comprises an inorganic barrier material. This layer particularly preferably comprises a non-metallic inorganic barrier material.

[0147] This layer preferably comprises silicon dioxide (SiOx) as a barrier material. This layer is preferably applied directly to the paper material of the inner material layer 11. Prior to applying the SiOx coating, the paper material of the inner material layer 11 may have a thin plastic layer, preferably in the form of a primer. Alternatively, the inner material layer 11 may already exist as a laminate of cardboard, paper, particularly kraft paper, and a barrier film, with an additional SiOx layer present on or within the barrier film. This layer may already be present on the inner material layer before winding, or it may be applied to the inner material layer before winding. The layer can be applied after the inner material layer 11 has been wound, particularly after the entire hollow body has been wound. Plasma coating is particularly suitable for applying barrier layers made of SiOx.

[0148] This layer preferably contains nanocellulose, particularly microfibrillated cellulose (MFC).

[0149] The inner material layer 11 preferably contains nanocellulose, particularly microfibrillated cellulose (MFC).

[0150] The plastic barrier layer or barrier composite can includes a polyolefin layer and at least one adhesive layer. Furthermore, the barrier composite 20 may have an aluminum layer, an ethylene-vinyl alcohol copolymer layer, or a polyvinyl alcohol layer. In the case of an additional aluminum layer, the barrier composite 20 preferably has a content of at least 60 g / m³. 2 And at most 130g / m2 110g / m 2 The total weight. In the case of an additional layer of ethylene-vinyl alcohol copolymer or polyvinyl alcohol replacing aluminum, the barrier composite 20 preferably has a weight of at least 50 g / m³. 2 And at most 100g / m 2 70g / m 2 Total weight in grams.

[0151] Considering the above layer structure, it can be seen that, based on Figure 2 In the first embodiment, preferably, the wound inner material layer 11 and the wound outer material layer 12 are glued together on the entire surface of the opposite side surfaces of the respective kraft paper layers 18. According to... Figure 3 In the second embodiment, preferably, the inner material layer 11, the intermediate material layer 14 and the outer material layer 12 on the opposing kraft paper layer 18 are glued together on their entire surface.

[0152] In summary, this exemplary fluid container, described as a beverage can, is primarily made of cardboard material and is suitable for both non-carbonated and carbonated beverages. While other forms are theoretically possible, such as the shape of a 5-liter beer keg, it is preferably manufactured in a three-piece linear fashion, primarily for uniform pressure absorption in a cylindrical fluid container. The fluid container comprises a can body 2 made of a multi-layered cardboard and barrier cardboard composite material, a bottom element 4 preferably made of metal, preferably aluminum, and a lid element 5 preferably made of metal, preferably aluminum. The lid element 5 is also provided with a known means for opening, preferably a pull ring, with an optional means for reclosing.

[0153] For production, such as Figure 4 and 5 As shown, the innermost winding, i.e., the innermost layer 11 serving as a barrier fiber roll, is formed around the mandrel 23. In this case, the edge region of the layer protruding beyond the winding circumference is preferably located on the outer side above another edge region. If the plastic layer rests against the plastic layer of the overlapping portion, the two overlapping edge regions are preferably joined to each other by inductive or ultrasonic welding, for example, welding, or, if at least one adjacent layer of the overlapping portion is made of paper, adhesive. As shown, an adhesive or filler material (in particular glue 22) can be applied to the overlapping region 52 such that the two edge regions of the overlapping winding layers adhere to each other.

[0154] like Figure 5 As shown, the next layer 14 of the cardboard composite material is wound around the mandrel 23 and the existing layer 11 simultaneously and slightly offset in space, and here according to Figure 4The layers are connected in a manner similar to the first layer, and the next layer 14 is bonded to it by adhesive. The edge regions of the second layer 14 are preferably progressively sanded so that they can be reliably connected to each other via an overlap 45, which is then glued to form a central seam 17. Figure 5 The diagram also shows a third layer 12 of the cardboard composite material, the outer layer, which can also be wound around the intermediate layer 14 with very slight temporal and local offsets, and can also be bonded with positive overlaps to form an outer seam 16. The outermost layer can be coated with an external material, such as a layer with very fine pores, allowing water vapor to escape from the can and conversely preventing water vapor from penetrating into the can. This coating is preferably polyethylene (PE), polypropylene (PP), or polyethylene terephthalate (PET). The outermost seam 16 can be sealed with a sealing strip (shown in dashed lines) made of PE, PP, or PET with or without adhesive, and the sealing strip is applied in a form that has or does not have heat. Instead of adhering the strip 46 to the resulting continuous tube 27 moving on the mandrel 23, the outermost seam 16 can be sealed with hot liquid PE.

[0155] For the industrial production of cans made from cardboard composite materials, the material is supplied in rolls from prefabricated sheets of coated kraft paper, from which the material is unwound and fed. Figure 5 The winding device is shown. Figure 5 In this example, for instance, three rolls will exist as three layers of fiber rolls 11, 14, and 12 to be wound. After unwinding, preferably, the edge regions of the fiber rolls 14, 12 are machine-polished to create inclined surfaces 44 or steps 21. Primarily these rolls, along with the adhesive and bottom and cap elements, can be supplied to can-filling apparatuses for producing fluid containers, but do not produce empty bottles and therefore no bulkier cargo.

[0156] Before being supplied to the winding device, the fiber rolls 11, 14, 12 are coated with an adhesive, preferably glue, on one of their flat sides.

[0157] After that, as Figure 5 As shown, the "continuous" fiber rolls of individual layers 11, 14, and 12, i.e., those that first form the innermost layer 11, are wound around the steel mandrel 23 by a machine station through feeding and pulling along a fixed cylindrical steel mandrel 23. The material fiber rolls extend between the steel mandrel 23 and a plurality of adjacent rollers (not shown), each roller having a U-shaped cross-section. For the innermost layer 11, the two edges of the barrier layer overlap, as... Figure 4 As shown. Then, the innermost layer 11, wound into a tube, advances onto another part of the steel mandrel 23. Contact rollers (not shown) support the innermost layer 11 supplied to the mandrel 23, so that the innermost layer 11 is conveyed onto the mandrel 23.

[0158] Next, the center layer 14 is locally applied onto the innermost packaging material or layer 11 on the same machine following the innermost layer 11. The inclined surface 44, preferably cut into step 21 or the longitudinal edge of the center layer 14, overlaps by winding with mandrel 23 and is glued by the previously applied adhesive. Finally, the outer layer is also applied simultaneously and is partially retracted back onto the previously wound layer 14.

[0159] Then, tube 27, made of cardboard composite material, which consists of three bonded layers and as... Figure 5 As shown, it is fed to the cutting device 26, for example, as Figure 5 The clock-controlled front and rear cutting machine shown cuts the tube 27 into segments 28 at the desired location. Cutting can be performed not only with a preferably mobile cutting machine, but also with known multi-rotor blade machines. In this case, a carriage with several rotating blades moves at a production speed along with the continuous tube 27, thus allowing several segments 28 to be cut in a single operation. After cutting, the segments 28 preferably pass through a hot channel to remove adhesive. Heat can be generated in various ways; hot air is preferred.

[0160] After the pipe segment 28 is cut to the required length, the two cut edges at the open end of the pipe segment 28 are formed in a raised form by a machine according to the required tank volume. For this purpose, a rotating unfolding tool is inserted into the open end from both sides. Figure 6 A feasible method for this unfolding is illustrated. The can 2 is inserted into a hollow cylinder 48 with a rounded inner flange 51. Using a steel roller 49 rotating about an axis 50, the curved inner edge 51 is indented, wherein the axis 50 moves, thereby defining a conical wall. The steel roller 49 rolls the upper edge portion of the can 2 on the curved inner edge 51 in one or more passes, slightly unfolding the layers. Figure 7 As shown, a raised edge is obtained. The cut edges are preferably sealed after combing, or spread by coating with a dispersion adhesive such as liquid polyethylene PE or other suitable fast-curing and food-grade adhesives, so that moisture cannot penetrate into the interior of the kraft paper layer, since subsequent filling inevitably occurs in a humid atmosphere. The cut edges are then heat-treated again to minimize curing time. For this purpose, infrared radiation is preferred at this time. Subsequently, these tube segments 28 are arranged in rows in a vertical position in a transport device and then pass through a disc conveyor belt 30, as... Figure 10 As shown, the machine 32 initiates the isolation of the sealing element, such as the bottom element 4, on the disc conveyor belt, starting from the feed hopper 31, in the open top side of each tube segment 28, and forming the outer edge region of the radially outward bottom edge of the sealing element in a tightly sealed manner around the edge region of the open tube segment 28.

[0161] Figure 7The process of tightly curling a sealing element in the form of a bottom element 4 or a lid element 5 is illustrated. The bottom and lid elements can be standard bottoms or standard lids used to seal conventional aluminum cans, and can then be assembled using the same machine. The bottom element 4 or lid element 5 is made of aluminum and has a radially projecting edge region 41, i.e., a region protruding beyond the diameter of the can body 2. The bottom 4 or lid element 5 with the edge region 41 is overlapped with the edge region 42 of the can body 2 by a machine. Thereafter, curling is performed by a machine 32, for which the machine 32 curls the cantilevered double-layered portions 41, 42, i.e., the edge portion 41 of the can body together with the edge portion 42, i.e., curls them approximately 360° or more, creating a tightly shaped seam. Figure 7 As shown, the cut edge of the tank body 2 is sealed with a moisture-proof material 37. The cover element 5 or bottom element 4 typically has a composite material 38, which is an elastic sealing material, applied to the area of ​​the protruding edge region 41 facing the edge region 42 of the tank body 2.

[0162] Preferably, the composite material 38 extends from the inside of the rolled edge 39 (outermost downward curvature of the edge) of the cover element 5 or the bottom element 4 to the shoulder 40 of the cover element 40, wherein the composite material 38 extends at least partially at the height of the shoulder 40 and at least partially beyond the inner diameter of the rolled edge 39. Preferably, the composite material 38 extends at least half the height of the shoulder 40.

[0163] Figure 8 An optional bottom or lid 4 is shown, illustrated here in diametrical cross-section. As shown, a silicone-based sealing ring 47 is inserted into the downward-opening channel formed therein. The lid is then installed in a standard aluminum can using the same machine. The silicone seal provides additional adequate sealing, and the overlapping areas are rolled inward together.

[0164] Figure 10 A rotary conveyor 32 with a disc conveyor belt 30 is shown. As described above, the rotary conveyor mounts the bottom element onto the can and curls the edge of the bottom element to the edge of the can. Then, as... Figure 11 As shown, the single-sided open pipe sections 28 fall into the conveying channel, so that their open sides are now facing upwards. They then pass through filling stations 33, specifically rotary filling stations 33, which fill each pipe section 28 with a defined filling volume. Finally, as... Figure 12 As shown, the filled tube segment 28, which is closed at the bottom, passes through the disc conveyor belt 34, on which the machine 35 inserts a single cap element 5 with a pull ring closure from the feed hopper 36 into the top side of the opening of each filling tube segment 28, and then curls the radially protruding edge of the cap element 5 around the edge region of the opening tube segment 28 in a sealing manner.

[0165] The filling and sealing container 1 is shown in the following figure. Figure 9 As shown, it is presented in cross-section along its longitudinal axis. It can be seen that the tank body 2 and the upper and lower flanges 43, the cover 5 and the bottom 4 are fixed in a sealed manner.

[0166] exist Figure 13 The first embodiment of the can shell 101 is shown in a longitudinal section through the cylindrical container. The can shell 101 has a barrier layer 102, a first intermediate layer 103, preferably at least one second layer 104, an outer paper or kraft paper layer 105, and an outer barrier layer 106 from the inside to the outside.

[0167] The barrier layer 102 has an overlapping seam at a point on the circumference that extends in the longitudinal direction of the tank shell 101, wherein, in the overlapping seam, one of the two layers of the barrier layer 102 is on top of the other.

[0168] Figure 13-15 The first embodiment shown includes only a barrier membrane or barrier laminate structure 108 consisting of several film layers, serving as barrier layer 102. Barrier layer 102 is moisture-proof and is tight from both sides and its cut edges. Simple overlap of barrier layers 102 is sufficient to produce a tight longitudinal seam.

[0169] Figure 14 and 15 Detailed illustration Figure 13 In one embodiment, the barrier layer 102 is shown herein as a barrier laminate structure 108. Advantageously, when longitudinal seams are formed, it is not necessary to bond different materials together, as different adhesives (e.g., bonding paper materials and plastics) typically require more specialized adhesives and / or more time, and result in weaker bonds than bonding paper to paper or plastic to plastic. In one embodiment, the barrier laminate structure is welded to itself in the overlapping areas. In addition to the variations of inductive or ultrasonic welding already mentioned, welding can also be performed in all embodiments of the invention by directly heating the plastic, for example, by hot air.

[0170] The overlap length of the longitudinal seam in the circumferential direction of the tank shell 101 is preferably between 1 and 6 mm, particularly preferably between 2 and 4 mm, especially 3 mm.

[0171] Deviation Figure 13-15 ,exist Figure 16-31 In one embodiment, the barrier layer 102 is designed as a composite of kraft paper layer 107 and a barrier film, or as a composite of kraft paper layer 107 and a barrier laminate structure 108 consisting of multiple film layers. This makes the barrier layer 102 easier to encapsulate and more stable.

[0172] Preferably, the overlap length of the longitudinal seam in the circumferential direction of the tank shell 101 is between 1 mm and 6 mm, particularly preferably between 2 mm and 4 mm, and especially 3 mm.

[0173] like Figure 16 and 31 As shown, the innermost layer of the can shell 101 can be formed by a barrier laminate structure 108 preferably laminated on a kraft paper layer 107. Preferably, the bonding of the barrier laminate structure 108 and the kraft paper layer 107 has already occurred before the cylindrical can shell 101 is wound. The material of the barrier layer 102 is preferably produced in the form of a composite material of the kraft paper layer 107 and the barrier laminate structure 108, which is then wound into a roll and provided as a roll for the winding process of the cylindrical can shell 101.

[0174] Figure 16-18 A second embodiment is shown.

[0175] In the region of the longitudinal joint, the barrier layer 102 is in Figure 16-18 In this embodiment, the layers overlap. The two layers of barrier layer 102 abut against each other. To seal the internal cut edges of barrier layer 102, a sealing strip 110 is attached, which protrudes beyond the cut edges on both sides and is glued or welded here to the two inner foil portions of the barrier laminate 108.

[0176] In the longitudinal seam area, viewed from the inside out, first is the sealing strip 110, then a barrier laminate 108, followed by a kraft paper layer 107, all of which are firmly bonded to each other before winding. The kraft paper layer 107 is adjacent to another barrier laminate 108, wherein these kraft paper layers preferably adhere to each other during winding. Following the other barrier laminate 108 is another kraft paper layer 107, which are also firmly connected to each other before winding.

[0177] Figures 19-21 A third embodiment is shown. In this embodiment, the barrier layer 102 is wound without overlap such that the two edges of the barrier layer extending in the longitudinal direction of the tank shell 101 meet to form a butt joint. To seal the longitudinal seam as the adjacent edges, a sealing strip 110 is attached.

[0178] Less preferably, adjacent edges can be sealed or made liquid-tight by applying a liquid sealant (e.g., hot melt).

[0179] Figures 22-24 A fourth embodiment is shown. In this embodiment, the barrier laminate structure 108 or barrier film protrudes beyond the kraft paper layer 107, such that the cut edges of the kraft paper layer 107 are covered or sealed by the barrier laminate structure 108 or barrier film. Figure 24In the first edge region, the kraft paper layer 107 and the barrier laminate structure 108 both overlap with the kraft paper layer 107 and the barrier laminate structure 108 in the second edge region. The distance between the barrier laminate structure 108 in the first edge region and the second edge region is longer than that between the kraft paper layer 107 and the second edge region.

[0180] Figures 25-27 A fifth embodiment is shown. In this embodiment, the barrier laminate structure 108 or barrier film protrudes beyond the kraft paper layer 107, such that the cut edges of the kraft paper layer 107 are covered or sealed by the barrier laminate structure 108 or barrier film. Figure 27 In the illustrated embodiment, only the barrier laminate structure 108 in the first edge region overlaps with the kraft paper layer 107 and the barrier laminate structure 108 in the second edge region. The kraft paper layer 107 in the first edge region is mated with the kraft paper layer 107 in the second edge region, thus, as shown in the figure, there can also be small gaps between the edges of the kraft paper layers.

[0181] Figure 28 A sixth embodiment is shown. In this embodiment, the barrier laminate structure 108 or barrier film protrudes beyond the kraft paper layer 107 in a first edge region, and in a second edge region, the kraft paper layer 107 protrudes beyond the barrier laminate structure 108. The barrier laminate structure 108 in the first region rests against the inside of the exposed kraft paper layer 107 in the second region. As shown, the two edges of the barrier laminate structure 108 may be adjacent, in which case the sealing strip 110 covers the adjacent edges. In another embodiment, the barrier laminate structure 108 in the first edge region overlaps with the barrier laminate structure 108 in the second edge region, in which case the sealing strip 110 is not required.

[0182] Figures 29-31 A seventh embodiment is shown. In this embodiment, the barrier laminate structure 108 or barrier film protrudes beyond the kraft paper layer 107 in a first edge region, and in a second edge region, the kraft paper layer 107 protrudes beyond the barrier laminate structure 108. The kraft paper layer 107 in the first edge region rests on the inside of the exposed kraft paper layer 107 in the second edge region. The kraft paper layer 107 in the first edge region may be adjacent to or have a gap with the barrier laminate structure 108 in the second edge region. The barrier laminate structure 108 in the first edge region overlaps with the barrier laminate structure 108 in the second edge region and is bonded or welded thereto. The two overlapping kraft paper layers 107 in the first and second edge regions may be adhered to each other, particularly with adhesive.

[0183] exist Figures 16-31 In this embodiment, the outer layer of the barrier layer 102 is thus formed by a kraft paper layer 107 over the entire circumference. The kraft paper layer 107 is preferably untreated on the outside, i.e., not painted or laminated, so that the outside is formed of kraft paper material.

[0184] exist Figures 16-31 In this embodiment, during the winding process, the inner intermediate layer 103 is placed around the outer side of the barrier layer 102, wherein the intermediate layer 103 is not treated, i.e., no coating or lamination is applied to its inner and outer sides. The inner side of the inner intermediate layer 103 is bonded to the outer side of the barrier layer 102 over its entire surface, such that preferably, kraft paper material is bonded directly to kraft paper material, allowing the adhesive to penetrate into the fiber matrix of both layers, thereby achieving a particularly high final strength of the adhesive bond.

[0185] Less preferably, other adhesives may also be used, such as hot melt adhesives or two-component adhesives, where the lower final strength of hot melt adhesives and the difficulty in processing two-component adhesives can be considered significant disadvantages over glue or water-based adhesives. Glue, as understood herein, refers to an aqueous solution of the adhesive. In particular, known paper glues may be used.

[0186] Less preferably, a combination of two or more different adhesives can be used, which can be used together to bond two layers, or used separately to bond different layers. For example, hot melt adhesives and water-based adhesives can be applied side by side to the layer used to bond the two layers together.

[0187] Solvent-based adhesives and glues can be used, especially in liquid or foam form.

[0188] The advantage of foam is that it can cover the surfaces to be adhered or glued with less liquid compared to non-foam adhesives or glues.

[0189] exist Figures 13-15 In this case, the inner intermediate layer 103 surrounds the barrier laminate 108 or the barrier film. In one embodiment, the inner intermediate layer 103 has a coating made of plastic or a laminated film on its inner side. In this embodiment, the coated or laminated side of the inner intermediate layer 103 may be glued or welded to the barrier laminate structure 108 or the barrier film.

[0190] like Figures 13-33 As shown, preferably, during the winding process, at least one additional intermediate layer 104 is placed around the outside of the inner intermediate layer 103, wherein, preferably, the additional intermediate layer 104 is not processed, i.e., it is not coated or laminated on the inside.

[0191] Using at least two intermediate layers 103, 104 is more complex and associated with higher material costs than using only one thicker layer for the can shell; however, it is advantageous that two thinner layers (especially kraft paper layers) can be processed more quickly on a winding machine, and the stability of the can body can be surprisingly improved compared to using a single thicker layer.

[0192] Preferably, two intermediate layers 103, 104 and an additional paper or kraft paper layer 105 are used, such as Figures 13-33 As shown, the inner intermediate layer 103 and each additional intermediate layer 104 are preferably uncoated on both sides, and the outer paper or kraft paper layer 105 is preferably untreated or uncoated at least on the inner side.

[0193] The preferred tank shell has a manufacturing height of 130mm-150mm, an outer diameter of 50mm-60mm, and an inner diameter of 48.6mm-58.6mm.

[0194] The preferred sealed container has the following dimensions: external height 134mm, internal height 133mm, external diameter 52.4mm, internal diameter 51.2mm, internal volume approximately 270-275ml, and filling volume 250ml.

[0195] As described above, the can has a barrier layer 102 as the innermost layer, which in Figures 16-34 In the embodiments, it is formed from a thin film material and kraft paper and Figures 13-15 In the embodiments, only thin film material is formed. The film material is preferably a composite film comprising an aluminum foil and at least one plastic film, which together form a barrier laminate structure 108. The barrier laminate structure 108 preferably has an aluminum foil, and particularly preferably has a layer thickness of 6 to 9 μm, which exists between two plastic layers.

[0196] The barrier laminate structure 108 preferably comprises a plastic film, preferably PE, aluminum foil, preferably a Surlyn-type adhesive promoter, and a plastic film, preferably PE, arranged from the inside out. The layers of the barrier laminate structure 108 particularly preferably have the following thicknesses: plastic film 10-25 μm, adhesive 2-5 μm, aluminum foil 6.5-7.5 μm, and plastic film 10-25 μm.

[0197] The barrier laminate 108 preferably has a thickness of 30 μm-55 μm. A particularly preferred thickness is 35-50 μm, especially 40-45 μm. Preferably, the basis weight of the barrier laminate 108 is 45-75 g / m³. 2 Especially 50g / m 2 -65 g / m 2 .

[0198] In one embodiment, the barrier layer 108 further includes at least one layer of silicon-containing barrier material, particularly made of SiOx, which is present on or in the barrier laminate structure, or replaces one, several or all layers of the barrier laminate structure.

[0199] In one embodiment, there is a layer formed of SiOx with a thickness of at least 50 nm, particularly at least 500 nm.

[0200] The kraft paper layer 107 of the barrier layer 102 preferably has a thickness of 60 μm to 90 μm. Particularly preferably, the kraft paper layer 107 of the barrier layer 102 has a thickness of 70-85 μm. The kraft paper layer 107 of the barrier layer 102 preferably has a thickness of 40 g / m². 2 Up to 80g / m 2 Especially 50-70g / m 2 Especially 60g / m 2 The weight in grams.

[0201] The barrier layer 102 has a preferred layer thickness of 90 μm to 145 μm. The barrier layer 102 has a particularly preferred layer thickness of 110-135 μm.

[0202] The tensile strength MD of the kraft paper in kraft paper layer 107 is preferably at least 4 kN / m, particularly at least 5.0 kN / m. The tensile strength CD of the kraft paper in kraft paper layer 107 is preferably at least 2 kN / m, more preferably at least 2.5 kN / m.

[0203] In a second embodiment of barrier layer 102, it has a barrier laminate structure 108 from the inside to the outside, comprising the following layers: a plastic layer in the form of a heat-sealing coating, preferably PET; an aluminum layer in the form of aluminum foil; a plastic layer in the form of an adhesive; and a kraft paper layer 107 made of kraft paper. The kraft paper of the kraft paper layer 107 preferably has a g / m² content of 40 g / m³. 2 The weight of the heat-sealing varnish is preferably 1.6 g / m³. 2 The basis weight, aluminum foil, layer thickness of 7.7μm, and 20.8g / m 2 The weight, and the plastic layer of the adhesive, 2g / m 2 The weight per unit area. In summary, the barrier layer 102 has a layer thickness of approximately 60 μm and a weight of approximately 65 g / m³. 2 The weight in grams.

[0204] The barrier layer 102 is wound longitudinally around the mandrel to form a longitudinal seam, thereby forming a tubular body. The inner plastic film of the barrier laminate structure 108 faces the mandrel, and the kraft paper layer 107 faces away from the mandrel.

[0205] The next layer, i.e., the inner intermediate layer 103, is preferably made of kraft paper, and particularly preferably has a g / m² content of 125 g / m³. 2 The kraft paper has a basis weight, a tensile strength (MD) greater than 12 kN / m, and a thickness of 0.160 μm. Both sides of the kraft paper are untreated. Preferably, the inner kraft paper layer 103 has a basis weight of 95 g / m². 2 Up to 135g / m 2 The weight and / or greater than 10 kN / m 2 The tensile strength and / or thickness of 0.140 mm to 0.175 mm.

[0206] The kraft paper layer is directly and completely bonded to the kraft paper layer 107 of the barrier layer 102 by being wound around the tubular body of the barrier layer 102, particularly by gluing.

[0207] For bonding, a concentration of 10-25 g / m is preferred. 2 Especially 15-20g / m 2 The amount of adhesive, preferably polyvinyl acetate, is applied to the outside of the barrier layer 102 or the inside of the inner intermediate layer 103.

[0208] The next layer is the middle layer 104, for example, made of kraft paper, with a g / m² of 125 g / m³. 2 The kraft paper has a basis weight, a tensile strength greater than 12 kN / m, and a thickness of 0.160 mm. Both sides are untreated. Preferably, the intermediate layer 104 has a basis weight of 95 g / m². 2 Up to 125g / m 2 The weight and / or tensile strength greater than 10 kN / m and / or thickness from 0.140 mm to 0.175 mm.

[0209] The additional intermediate layer 104 is directly and integrally bonded to the underlying inner kraft paper layer 103 by wrapping it around the tubular body of the barrier layer 102 and the inner intermediate layer 103, particularly by gluing.

[0210] For bonding, polyvinyl acetate is preferred, preferably at a concentration of 10-25 g / m³. 2 Especially 15-20g / m 2 The amount is applied to the outside of the inner intermediate layer 103 or the inside of another intermediate layer 104.

[0211] Preferably, the can body has a fourth layer formed by an outer paper or kraft paper layer 105. The outer paper or kraft paper layer 105 preferably has a g / m³ content of 80-130 g / m³. 2 Especially 100-120g / m 2 The basis weight. The outer paper or kraft paper layer 105 preferably has a thickness of 70-120 μm, especially 90-110 μm.

[0212] The outer paper or kraft paper layer 105 is applied to the intermediate layer 104 in the winding apparatus, and preferably with an adhesive, preferably polyvinyl acetate, at a preferred concentration of 10-25 g / m². 2 Especially 15-20g / m 2 The amount adheres to the entire surface.

[0213] The can shell 101 preferably comprises a barrier layer 102, an inner intermediate layer 103, an intermediate layer 104, and an outer paper or kraft paper layer 105. The thickness D of the can shell is approximately 550 μm. The can shell 101, composed of the barrier layer 102, the inner intermediate layer 103, the intermediate layer 104, and the outer paper or kraft paper layer 105, preferably has a total thickness of 500-650 μm, more preferably 550-620 μm. The can shell 101, composed of the barrier layer 102, the inner intermediate layer 103, the intermediate layer 104, and the outer paper or intermediate paper layer 105, preferably has a tensile strength CD greater than 300 N / 15 mm, particularly greater than 350 N / 15 mm, i.e., greater than 20 kN / m, particularly greater than 23 kN / m. Preferably, the can shell 101, composed of a barrier layer 102, an inner intermediate layer 103, an intermediate layer 104, and an outer paper or kraft paper layer 105, has a basis weight of at least 400 g / m³. 2 Especially at least 450g / m 2 .

[0214] Preferably, the outer kraft paper layer 105 has an outer barrier layer 106, such as a single-layer barrier film, on the side facing the outside of the can, which may or may not have pinholes, and preferably has a density of 15 g / m³. 2 Polyethylene (PE) with a weight and / or a thickness of 15 micrometers, or coated with varnish.

[0215] Alternatively, the outer layer may consist solely of an external barrier layer 106 in the form of a barrier film, with or without pinholes, preferably having a density of 25 g / m³. 2 The PE. In this case, the material thickness of the inner intermediate layer 103 and the second intermediate layer 104 can be adjusted to maintain the total material thickness of the tank shell.

[0216] Depending on the height and diameter of the can, it is conceivable that the number of intermediate layers 104 can be greater than one. For example, for a can with a height of 245 mm and a diameter of 175 mm, two intermediate layers are preferred. With a preferred thickness of 0.160 μm for each of the layers 103, 104, and 105 and a thickness of 127 μm for the barrier layer 102, a total thickness D of 767 μm is obtained, for example.

[0217] Based on the height and diameter of the can, it can be assumed that the inner intermediate layer 103, intermediate layer 104, and outer kraft paper layer 105 have greater strength, for example, in the case of a can with H: 245 mm and D: 175 mm and each with a thickness of 265 μm. For example, in the case where the thickness of the barrier layer 102 is 127 μm, the total thickness D becomes 922 μm.

[0218] Increasing the number of layers is better than increasing the thickness of the layers because thinner layers can achieve higher processing speeds and greater can stability relative to the total weight of the kraft paper used.

[0219] As a measure of the tensile strength MD and basis weight of kraft paper used for kraft paper layers 107 and 103, 104, and 105, the tensile strength index MD is preferably in the range of 70-120 Nm / g.

[0220] As the quotient for the tensile strength CD and basis weight of kraft paper used for kraft paper layers 107 and 103, 104, and 105, the tensile strength index CD is preferably in the range of 35-70 Nm / g.

[0221] The tensile strength index (MD) of the kraft paper used is preferably greater than 80 Nm / g. A tensile strength index (MD) greater than 100 Nm / g is particularly preferred.

[0222] The tensile strength index (CD) of the kraft paper used is preferably greater than 40 Nm / g. The tensile strength index (CD) is preferably greater than 50 Nm / g.

[0223] In addition to the kraft paper layer 107, the layer structure preferably includes at least two additional layers 103 and 104 made of kraft paper, each having a specific tensile strength index MD and CD. At least one of the kraft paper layer 107 or the additional layers 103 and 104 may also be formed from another paperboard material having a specific tensile strength index MD and CD. Kraft paper differs from conventional paper in its larger tensile strength index MD (machine direction), and particularly CD (cross direction).

[0224] Preferably, the kraft paper of kraft paper layer 107 and layers 103, 104 is unbleached. The paper or kraft paper of outer paper or kraft paper layer 105 can be bleached, which is advantageous for printing patterns on its outer side. The product design may have been printed on the outer paper or kraft paper layer 105 before winding, and this printing can advantageously exist between the paper or kraft paper layer 105 and the outer barrier layer 106. The cut in the cutting device 26 is then aligned relative to the printing.

[0225] Figure 32 A cross-section of a particularly preferred structure of the can shell 101 according to the invention is shown. In this structure, the inner intermediate layer 103 and the additional intermediate layer 104 have sloping side edges such that the two edges of the layers opposite the respective fiber roll materials overlap each other, but there is no or substantially no increase in the layer thickness in the overlapping area. As an alternative to the sloping shape, other edge shapes are also suitable, such as stepped edges or interlocking edges, as... Figure 33As shown. Generally, at least one edge of at least one of the two edges of at least one of layers 103, 104, and 105 is preferably formed in a shape that reduces the thickness at the overlapping region of the two edges. Particularly preferably, the two edges of at least one of layers 103, 104, and 105 have a shape such that the thickness of the overlapping edge is equal to the thickness of the layer itself. Particularly preferably, the inner intermediate layer 103 has such a structure. Preferably, at least one applied intermediate layer 104 has such a structure, and particularly preferably, all existing applied intermediate layers 104 have such a structure.

[0226] like Figure 32 As shown, the edges of the outer kraft paper layer 105 preferably meet at the joint, where the gap is sealed at the joint by applying a strip 109 (also called a strip) of PE, PET, or PP, or by applying a sealing material via a nozzle after the can body is formed. The adjacent edges of the outer kraft paper layer 105 are advantageous because the resulting gaps are more regular and therefore visually appealing, and there is no reduction in layer thickness in the edge region of the outer kraft paper layer 105, which would make it less susceptible to mechanical effects from the outside.

[0227] Less preferably, the edges of the inner intermediate layer 103 and / or the edges of the additional intermediate layer 104 may meet to form a butt joint in the respective layers, which would be considered to adversely affect the stability of the layer structure.

[0228] To produce the can shell 101 according to the invention, the barrier layer 102 is first supplied as a fiber roll material in the longitudinal direction of the mandrel of a winding machine, and further moved in the longitudinal direction of the mandrel. Two edges are formed around the mandrel such that these edges meet on the other side of the mandrel, and the mandrel is now closed by the fiber roll material.

[0229] To create a longitudinal seam, the two edges of the fiber roll material of the barrier layer 102 are positioned on top of each other on the mandrel. Preferably, the barrier layer 102 has no adhesive on the outer side.

[0230] Therefore, particularly preferably, the winding machine according to the invention is provided as an improvement on known prior art, the winding machine having a coater, for example having a nozzle, which coats an adhesive (e.g., glue or hot melt adhesive) in a targeted manner onto at least one of two side-by-side regions of the barrier layer 102 in the longitudinal seam region.

[0231] This advantageously prevents air from being trapped in the overlapping area, which could adversely affect the stability of the tank shell 101. The internal pressure of the tank will pressurize the trapped air in the layer structure, which will cause the pressure in the trapped air to compress the layer structure from the inside, or will cause the air to try to escape toward the end closed by the lid, which may lead to creep damage.

[0232] In the next step, the inner intermediate layer 103 is placed around the barrier layer 102, as the inner intermediate layer is also preferably supplied as fiber roll material in the longitudinal direction of the mandrel of the winding machine and moves further in the longitudinal direction of the mandrel. Two edges of the inner intermediate layer 103 are formed around the barrier layer 102 located on the mandrel, such that these edges meet on the other side of the mandrel, and the barrier layer 102 located on the mandrel is now closed by the fiber roll material of the inner intermediate layer 103. As described above, the edges of the inner intermediate layer 103 preferably overlap each other, such that they are bonded together. The inner intermediate layer 103 is provided with adhesive on its inner side, for example by applying adhesive during the supply of the fiber roll material, wherein when the inner intermediate layer 103 is fitted or pressed onto the kraft paper layer 107 of the barrier layer 102, the adhesive is distributed over the entire area between the layers.

[0233] In the next step, 0 to preferably up to 3 additional intermediate layers 104 are continuously laid around the inner intermediate layer 103, wherein these central kraft paper layers are also preferably supplied as fiber roll material in the longitudinal direction of the mandrel of the winding machine and moved in the longitudinal direction of the mandrel. The two edges of each additional intermediate layer 104 are formed around the intermediate layer 103 already on the mandrel, such that these edges meet on the other side of the mandrel, and the inner intermediate layer 103 on the mandrel is now closed by the fiber roll material. As described above, the edges of each intermediate layer 104 preferably overlap each other, such that they are bonded together. Each intermediate layer 104 is provided with adhesive internally, for example by applying adhesive during the supply of the fiber roll material, wherein the adhesive already on the mandrel is distributed over the entire area between the layers when the intermediate layer 104 is matched or pressed onto the inner intermediate layer 103.

[0234] In the next step, the outer paper or kraft paper layer 105 is formed around the outer layers 103, 104 already located around the mandrel, because the outer paper or kraft paper layer 105 is also preferably supplied as a fiber roll in the longitudinal direction of the mandrel of the winding machine and further moved in the longitudinal direction of the mandrel. The two edges of the outer kraft paper layer 105 are formed around the outer layers 103, 104 already located on the mandrel, such that these edges meet on the other side of the mandrel, and the layers 103, 104 already located on the mandrel are now closed by the fiber roll. As described above, the edges of the outer kraft paper layer 105 preferably do not overlap each other, such that they meet at the joint. The outer kraft paper layer 105 is provided with adhesive on its inner side, for example by applying adhesive during the supply of the fiber roll material, wherein when the outer kraft paper layer 105 is matched or pressed onto the underlying layers 103, 104, the adhesive is distributed over the entire area between the layers.

[0235] like Figure 32As shown, the outer kraft paper layer 105 may preferably already have an outer barrier layer 106, i.e., provided as a laminated structure or fiber roll material coated on one side, so that it has a liquid-resistant or liquid-repellent outer side. For example, the outer kraft paper layer 105 may be provided with waterproof or moisture-proof printing.

[0236] If the outer kraft paper layer 105 does not have a liquid-resistant or liquid-repellent outer side during the supply process, it can be provided during or after the winding machine. For example, a liquid-resistant or liquid-repellent film or a laminated structure with a winding machine can be applied around the outer kraft paper layer 105. For example, after winding, the formed hollow cylinder can be sprayed or printed with a liquid-resistant or liquid-repellent substance, particularly a coating. If a liquid-resistant or liquid-repellent film or laminated structure is applied to the outer kraft paper layer 105 using a winding machine, the plastic side film or laminated structure can be welded to the plastic side to tightly seal the outer kraft paper layer 105. In the case of a film, a simple overlap is sufficient. In the case of a laminated structure, for example, made of a film and a thin printed or label paper, a folded seam can also be provided thereon. The barrier layer 106 can also be applied at least externally to the outer kraft paper layer 105 in the form of a printed or label layer, and then the outer kraft paper layer 105 is sealed with adhesive strips 109, for example, in the adjacent areas at its two edges.

[0237] If the outer kraft paper layer 105 already has a liquid-resistant or liquid-repellent outer side during the feeding process, then in the next step, the bonding area of ​​the outer layer is preferably still sealed on the winding machine, for example by applying a liquid-resistant or liquid-repellent material as a liquid, or in the form of a strip 109, especially an adhesive tape.

[0238] Therefore, the outer seam of the outer paper or kraft paper layer 105, or another layer disposed thereon, can be designed as a folded seam, a simple overlap, or a butt joint. Butt joints can be sealed with hot melt adhesive, strips or tapes, or sealing liquids, wherein these devices are preferably applied to the winding machine after the outermost layer is wound and before the individual hollow tubes are cut. The strips or tapes can be self-adhesive or exist as plastic, particularly PE strips, which are fixed by ultrasonic welding.

[0239] Preferably, the hot melt adhesive is applied to the paper tube located on the mandrel in a winding machine with nozzles and moves through the nozzles. Preferably, the nozzles are oriented perpendicular to the gap of the butt joint, which extends along the longitudinal direction of the outermost paper tube applied in the winding machine. The nozzle cross-section may be cylindrical or rectangular and has a straight or flat opening surface.

[0240] However, preferably, when viewed from the circumferential direction of the paper tube, the nozzle opening surface is concave, which is suitable for the cylindrical shape of the tube, wherein the nozzle opening surface preferably has a uniform distance from the tube.

[0241] Preferably, the hot melt adhesive is applied directly to the winding machine after the outermost layer has been wound, wherein the outermost layer already has or has a dense outer barrier layer. The hot melt adhesive is applied to seal the absorbent cut edges of the outermost layer and / or to seal the underlying layer 103 or 104 exposed along the butt joint. Preferably, the outer layer is formed of an absorbent material, particularly paper or kraft paper, with a moisture-proof material provided on its outer side, such as a laminated moisture-proof film or a coating of moisture-proof substance. The gap of the butt joint is preferably in the range of 0.5-4 mm. The hot melt adhesive is preferably applied in the form of a strip protruding over the gap of the butt joint, wherein the width of the hot melt adhesive strip is preferably at least 1 mm wider than the width of the gap of the butt joint, particularly at least 2 mm wider. For example, the gap width of the butt joint is 3 mm, and the width of the hot melt strip is 6 mm. The hot melt adhesive is applied under heating, for example at 160°C-190°C, and hardened by cooling until the individual cylinders are cut by the mandrel 23 of the winding machine. This can preferably be supported by a cooling device, such as a blower. The butt joints are sealed with adhesive, resulting in a very flat or uniform outer perimeter of the can. The film formed on the outer barrier layer 106 by adhesive or hot melt adhesive is, for example, only 0.05-0.1 mm thick. Different paper or paperboard materials can also be used, preferably paper or paperboard materials made from or containing recycled paper or fiber materials, instead of the outer kraft paper layer 105 including the barrier layer 106.

[0242] In another embodiment of the outer seal according to the invention, the outer kraft paper layer 105 is provided with an outer barrier layer 106 in the form of a thin film, wherein the kraft paper layer 105 and the film exist as a laminated structure and are thus supplied to the winding device together as a roll of material fibers. The film layer is designed to be longer than the kraft paper layer 105 in the transverse direction of the roll of material fibers, such that the edge of the film layer protruding on one side rests on the other non-protruding edge of the film layer. In this case, the protruding edge of the film layer can be melted or welded to the film layer that does not overlap with the kraft paper, or an adhesive, particularly an activated, especially a heat-activated adhesive, can be applied to the underside of the overlapping area to bond the film layer to itself.

[0243] After the layers are wound and combined into a tubular body, individual hollow cylinders are cut from the mandrel using a known cutting machine, such as... Figure 5 As shown.

[0244] Each hollow cylinder then bends upward at both ends of its edge region.

[0245] The bending is preferably performed within a length range of 5 mm, with the outer edge bending outward by 2.5 mm. From the outer edge, the upward bending area preferably merges into the non-upwardly bent shell area along a circular path with a radius preferably 3-4 mm, particularly 3.3-3.5 mm.

[0246] Cut or bent edges are preferably coated with a sealing liquid to reduce their absorbency by moisture. This is preferably achieved by applying the sealing liquid during the bending process. Alternatively, the cut edges can be sealed by applying a tape or shrink tube.

[0247] The bent and finally sealed hollow cylinder is then transferred to a can sealing machine, in which the first end of the hollow cylinder, preferably the lower end, is sealed with a first sealing element, for example, first sealed with a bottom element 4. The bottom element 4 is preferably an aluminum bottom element of a conventional aluminum can, having at least substantially the same volume or the same diameter as the can of the present invention.

[0248] Subsequently, the medium, particularly carbonated beverages, is preferably filled in a 0.25-liter volume into a bottom-sealed hollow cylinder.

[0249] The filled hollow can is then sealed at the top with a second sealing element, such as a cap element 5. The cap is preferably an aluminum cap of a conventional aluminum can, having at least substantially the same volume or diameter as the can of the present invention.

[0250] Sealing and filling are preferably carried out on clock-controlled facilities with a capacity of 80,000 cans / hour.

[0251] Preferably, 40,000 cans are produced per hour on the winding machine, which means the finished tubes travel at a speed of approximately 1.5 m / s along the winding mandrel. A desired process output of 80,000 cans per hour can be achieved using a mirror machine, where flanged cans from two machine units are assembled in front of a bottom seal.

[0252] Preferably, the can shell 2 of the present invention, derived from a slower winding system, can be sealed together with a conventional aluminum can shell at the same faster sealing and filling facility, and more preferably has the same bottom element and the same cap, without recooling or time interruption. This means that the speed of the winding system is no longer critical to the process, and the filling facility can operate independently of the process with full process performance.

[0253] The composite cans and conventional aluminum cans according to the invention can be filled and sealed in batches or alternately in the same facility, thereby compensating for the lower production speed of a single winding facility through the production of conventional aluminum cans. For example, 40,000 cans / hour and 40,000 aluminum cans / hour can then be produced in the factory to advantageously produce two production lines simultaneously and continuously in the factory, namely environmentally friendly composite cans and proven aluminum cans.

[0254] The need for the composite shell cans according to the invention can be precisely met, and the remaining capacity of standard cans can be used. This is particularly advantageous for product introduction because the sale of the composite cans according to the invention does not initially lead to the full utilization of conventional filling facilities. The simultaneous or sequential use of filling facilities for the cans according to the invention and conventional aluminum cans thus further reduces the threshold for inhibiting product conversion, because aluminum cans can continue to be produced and can only be gradually replaced by composite cans in an increasing proportion.

[0255] Example 1

[0256] Using according to Figure 16-33 The preferred layer structure produces a beverage can with a height of 134 mm, an outer diameter of 52.4 mm, and a filling volume of 250 ml for carbonated beverages. For the paper or kraft paper layer 105, a paper with low tear resistance and free of wood, particularly Lumiflex, is used. TM 110 gsm Stora Enso AG, with a PE coating on the outer rear side of the can. The top and bottom of the beverage can are sealed with a standard bottom seal, and the lid of the aluminum can is sealed with a standard closure.

[0257] The layers used and the resulting layer structure are specified in the table below.

[0258]

[0259] Tensile strength MD (longitudinal) represents the tensile strength of the kraft paper in the longitudinal direction of the can shell 101, and tensile strength CD (transverse) represents the tensile strength of the kraft paper in the circumferential direction of the can shell 101. It can be seen that the conventional paper used in the paper layer 105, especially in the transverse direction (CD), has a significantly lower tensile strength.

[0260] Because each layer of adhesive is applied at 18g / m 2 The amount of adhesive applied increases the basis weight of the entire layered structure of the can shell 101 compared to the sum of the individual layers. Due to the three full-surface layers of adhesive, the total amount of adhesive applied is 54 g / m². 2 .

[0261] As the barrier laminate structure 108, a stack of structures having a 25μm thick PE plastic film, a 7μm thick aluminum foil, a 3μm thick Surlyn adhesive, and a 15μm thick PE plastic film is used.

[0262] The cans prepared in this way are suitable for storing and transporting carbonated beverages.

[0263] Therefore, a particularly preferred layer structure of the container according to the invention has an inner barrier layer 102 made of a barrier laminate structure 108 and a kraft paper layer 107 having a simple overlapping seam extending in the longitudinal direction of the can. Above the inner barrier layer are two wound layers 103, 104, each including an overlapping seam extending in the longitudinal direction of the can, wherein the layers 103, 104 have a reduced thickness on at least one side in the seam region. Above the kraft paper layers 103, 104 is a wound layer of paper or paperboard material having an outer barrier layer 106 on its outer side and a gap forming a butt joint extending in the longitudinal direction of the can, which is sealed with a hot melt adhesive, wherein the kraft paper surfaces of these layers 103, 104 are directly adhered to, in particular glued to, each other and to the layers below and above.

[0264] The advantages of the can according to the invention are recyclability and a good ecological assessment. Because the materials used in the can are similar to plastic-coated cardboard packaging, the aluminum components, paper layers, and plastic film can be separated and sorted for recycling using known dissolution methods similar to this. In particular, the high proportion of renewable resources, especially in the form of paper, makes the can superior to cans made of aluminum and / or plastic. The ecological assessment of this can is superior to that of conventional aluminum cans.

[0265] Figure 34 A longitudinal section is shown of a variant of the tank shell 101 with longitudinal seams through barrier layers in a tank 1 for containing solid, liquid, and / or gaseous media, which may be under positive pressure or may be generated during transport or storage. The cylindrical tank shell 101 is primarily composed of paper or cardboard material and at least two wound layers, and is closed at the bottom with a bottom element 4 and at the top with a cap element 5. The tank 1 is subjected to an internal pressure of at least 5 bar.

[0266] The innermost layer of the can shell 101 consists of a straight-wound barrier layer having a longitudinal seam extending along the longitudinal direction of the can 1. The barrier layer comprises an inner diffusion sealing film or inner diffusion sealing barrier element 108, a central paper or preferably kraft paper layer 107, and an outer plastic layer 111. At least one additional wound layer made of paper or paperboard material with an inner plastic layer 111 exists around the barrier layer of the can shell 101. The adjacent plastic layer 111 of the barrier layer 102 and the additional wound layer made of paper or paperboard material are directly welded to each other. The longitudinal seam can be adjusted according to... Figures 13-31 It was made according to one of the embodiments.

[0267] Another winding layer of the paper or paperboard material having an inner plastic layer 111 may also have an outer plastic layer 111.

[0268] In addition, there are one or more, preferably up to two, additional layers of paper or paperboard material, each additional layer of paper or paperboard material having an inner plastic layer 111 and / or an outer plastic layer 111, wherein adjacent plastic layers 111 in these layers are welded together.

[0269] like Figure 35 As shown, only one plastic layer 111 may exist between the other layers 103, 104, 105 of the paper or cardboard material, for example, by existing on one of two adjacent layers before winding. Figure 35 In the variant, there is no plastic layer 111 between the kraft paper layer 107 and the adjacent layer 103, so that the paper material is located on top of the paper material.

[0270] In one embodiment, the layered structure thus includes a barrier layer whose paper material is bonded (particularly glued) to the paper material of the next layer of paper or paperboard material, wherein at least one plastic layer 111 is present between the next layer of paper or paperboard material and the outermost layer of paper or paperboard material of the can shell, between any two of these layers. This at least one plastic layer 111 is advantageously used to bond the two layers by heating. The fact that at least two layers are bonded by heated or melted plastic reduces the amount of liquid introduced into the layered structure by adhesives or glues.

[0271] The direct bonding or gluing of two paper materials in at least two consecutive layers of paper or paperboard material improves the stability of the can, and the barrier layer is preferably one of these layers, so that the barrier layer and the subsequent layers are particularly firmly connected.

[0272] At least one plastic layer 111 disposed between two layers of paper or paperboard material is preferably provided with perforations or openings, allowing moisture to be distributed through the plastic layer 111 between the paper or paperboard material layers. Therefore, moisture introduced by adhesives or glues can be advantageously distributed between the paper or paperboard material layers, thereby reducing the total moisture content of each layer.

[0273] The preferred material for the plastic layer is polyolefin, especially PE.

[0274] Regardless of how the barrier layer 102 and the external barrier layer of the tank are implemented, Figure 34 and 35 All embodiments are advantageous. For example, the barrier material 108 of the barrier layer can be in the form of a thin film, a laminate, a composite film, or a coating, or a combination thereof.

[0275] Additional winding layers made of paper or cardboard material and its plastic layer 111 may have longitudinal seams, preferably with reduced thickness in their overlapping areas. The outermost layer may also have butt joints to properly seal gaps.

[0276] The paper or paperboard material of one or more layers or all layers of the can according to the invention or an embodiment of the can may preferably be kraft paper or paperboard material having comparable tensile indices MD (longitudinal) and CD (transverse).

[0277] Figures 36 to 41 A further embodiment is shown in which the inner edge of the inner intermediate layer 103 behind the barrier layer abuts the edge of the barrier layer 102, and the outer edge of the inner intermediate layer 103 overlaps with the inner edge of the inner intermediate layer 103. Due to manufacturing reasons, a gap may also exist between the inner edge of the inner intermediate layer 103 and the edge of the barrier layer 102, depending on how precisely the edge of the inner intermediate layer 103 can be positioned when winding around the barrier layer 102 located on the mandrel of the winding machine. Both the barrier layer 102 and the inner intermediate layer 103 have their own overlap, thus they are wound straight and therefore include edges extending straight in the longitudinal direction of the annular tube formed on the mandrel.

[0278] Preferably, the inner edge of the second intermediate layer 104 is adjacent to the outer edge of the first intermediate layer 103, and the outer edge of the second intermediate layer 104 overlaps with the inner edge of the second intermediate layer 104, such as... Figure 36 As shown. If there is also an intermediate layer made of paper or paperboard material (especially kraft paper), the intermediate layer is preferably implemented in the same manner.

[0279] Preferably, the inner edge of the outer paper or kraft paper layer 105 is adjacent to the outer edge of the bottom layer 104, and the outer edge of the outer paper or kraft paper layer 105 overlaps with the inner edge of the outer paper or kraft paper layer 105, such as... Figure 36 As shown. As already described with respect to other embodiments, the outer paper or kraft paper layer 105 has an outer barrier layer 106, or is provided with one.

[0280] The intermediate layers 103 and 104 preferably have the same material thickness.

[0281] The additional layers 103 and 104 may have reduced material thickness in one or both of the two overlapping edge regions in the regions that overlap with themselves.

[0282] like Figure 37 As shown, the edge of the barrier layer 102 can be formed by simply overlapping it with itself. As shown, the intermediate layer 103 can be specified to have the same thickness as the barrier layer 102. The intermediate layer 103 and the barrier layer 102 can also have different material thicknesses.

[0283] like Figure 38As shown, the edge of the barrier layer 102 can be formed by having a folded seam. As shown, the intermediate layer 103 can be specified to have the same strength as the double barrier layer 102. However, the intermediate layer 103 can also have a different material thickness.

[0284] like Figure 39 and Figure 40 As shown, the first edge of the second intermediate layer 104 may abut the outer edge of the first intermediate layer 103, and the second edge of the second intermediate layer 104 does not extend to the first edge of the second intermediate layer 104. Preferably, the second edge of the second intermediate layer 104 extends to the beginning of the region of the inner intermediate layer 103, in which there is an increased thickness of the layer structure caused by the overlap of the barrier layer 102 with itself. Figure 39 and 40 As shown, the second additional layer 104 increases the thickness in the overlapping area of ​​the hidden barrier layer 102 and the layer 103 thereon.

[0285] like Figure 41 and Figure 42 As shown, the outer edge of the inner intermediate layer 103 can be designed to have a reduced thickness, particularly with a sloping surface. Furthermore, the edge of the additional outer intermediate layer 104 can also be designed to have a reduced thickness, particularly with a sloping surface. As a result, the edges (particularly the sloping surfaces) of the two layers 103, 104 located above each other can overlap. Figure 41 and Figure 42 As shown, the second edge of the second intermediate layer 104 can also, or alternatively, be designed to have a reduced thickness, particularly a sloping surface. For example... Figure 41 As shown, another intermediate layer 104 can overlap itself, and its inclined surface at the outer edge can be used to attach an outer adjacent layer, which also has an inclined surface. Figure 42 As shown, another layer 104 can be used to conceal the increase in thickness, and the sloping surface exists in the region where the thickness of the composite of the barrier layer 102 and the inner intermediate layer 103 changes.

[0286] exist Figure 37 , Figure 39 and Figure 41 In some embodiments, the longitudinal joint can be sealed by the sealing strip 110 as shown. However, unlike the example shown, the longitudinal joint can also be sealed by a thin film layer of the barrier layer 102, which overlaps with the barrier layer 102 only in the region of the longitudinal joint, such as... Figure 15 , Figure 24 , Figure 27 and Figure 31 As shown.

[0287] exist Figure 36 , Figure 38 , Figure 40 and Figure 42 In this embodiment, since the cut edges of the paper or kraft paper layer 107 of the barrier layer 102 are not exposed inside, a seal is achieved through the fold seam itself. The fold seam is defined as the two edge regions of the barrier layer 102 abut against each other with their anti-diffusion barrier laminate structure 108 or its anti-diffusion film or coating, and the two edge regions fold back onto the barrier layer 102 itself.

[0288] Figure 43 and Figure 44 An embodiment is illustrated schematically, wherein the increase in the seam thickness of the barrier layer 102 is at least largely concealed by another layer of structure. Figure 43 and 44 In this design, the seam is designed as a self-sealing folded seam, but it can also be designed according to an embodiment of the seam of the barrier layer 102 described in other figures.

[0289] exist Figure 43 In this embodiment, the seam of the barrier layer 102 is accommodated in the gaps of the paper, paperboard, or particularly kraft paper material of the intermediate layer 103 adjacent to the barrier layer 102. Therefore, the two longitudinal edges of layer 103 are spaced apart from each other and located on either side of the increased thickness of the barrier layer 102 in the seam region. In this embodiment, subsequent additional layers of paper or paperboard (particularly kraft paper layer 104) preferably extend around the entire circumference of the can shell. Figure 43 As shown, the two longitudinal edges of layer 104 may be adjacent to or overlap each other, and the overlapping edge region of layer 104 may have a reduced thickness. Conversely, preferably, the butt joint or overlapping region of layer 104 is configured to be offset from the seam of barrier layer 102, thereby offset from the gap in layer 103.

[0290] exist Figure 44 In this embodiment, the seam between barrier layer 102 and layer 103 adjacent to barrier layer 102 is accommodated in a gap in another layer 104 of subsequent paper or paperboard (especially kraft paper). The two longitudinal edges of layer 104 are spaced apart from each other and are located on either side of the increased thickness of barrier layers 102 and 103 in the seam region. In this embodiment, layer 103 extends around the entire circumference of the can shell. Figure 44 As shown, the two longitudinal edges of layer 103 may be adjacent to or overlap each other, and the overlapping edge region of layer 103 may have a reduced thickness. As shown, preferably, the mating or overlapping region of layer 103 is offset from the seam of barrier layer 102, thereby offset from the gap of layer 104.

[0291] It has been proven Figure 44 The embodiments are superior Figure 43 In the embodiments, because Figure 44In this embodiment, the layer 103 directly adjacent to the barrier layer 102 is independent, thus the stability of the tank is higher, especially in the joint area of ​​the barrier layer 102.

[0292] Figure 45 One embodiment is shown in which at least one of the additional layers 103, 104 overlaps itself, and the overlapping edge regions of the respective layers 103, 104 do not have a reduced thickness. The two layers 103, 104 are preferably designed in this manner. Thus, layers 103 and / or 104 increase thickness in the form of a simple overlap. Barrier layer 102 can be implemented according to one embodiment described herein, particularly having a simple overlap or folded seam with itself in the seam region. The respective overlapping portions of layers 102, 103, and 104 are preferably offset from each other, so that there is no sum of thickness differences. The overlap range of layers 103 and / or 104 can be small, for example, in the range of 1 to 10 mm, particularly 1 to 5 mm.

[0293] Preferably, the inner or outer edge of at least one of the corresponding layers 103, 104 faces the region of the layer structure where the thickness of the layer structure changes. As shown in layer 103, at least one of layers 103, 104 can have its inner longitudinal edge in front of the increased thickness of the bottom layer and placed on top of the increased thickness, such that the outer longitudinal edge of the layer is in front of the rising edge of the increased thickness.

[0294] As shown, with the aid of layer 104, at least one of layers 103 and 104 can cause the inner longitudinal edge to follow the descending edge of the increased thickness of the bottom layer, and the other end can be guided on top of the increased thickness, such that the outer longitudinal edge of the layer overlaps with the inner longitudinal edge of the layer.

[0295] Figure 46 One embodiment is shown in which two additional layers 103, 104 overlap themselves. The overlapping edge regions of the respective layers 103, 104 may have no reduced thickness. Thus, layers 103 and 104 increase thickness in the form of a simple overlap. Barrier layer 102 can be designed according to one embodiment described herein, particularly having a simple overlap or folded seam with itself in the seam region. The respective overlaps of layers 102, 103, and 104 are set to be offset from each other, so that there is no sum of thickness differences.

[0296] The inner longitudinal edges of the two layers 103 and 104 face the descending side edge of the lower layer with increasing thickness, and the other end is guided above the increasing thickness, such that the outer longitudinal edges of the corresponding layers 103 and 104 overlap with the inner longitudinal edges of the corresponding layers 103 and 104.

[0297] like Figure 46As shown, the inner longitudinal edges of layers 103 and 104 may face a side edge with increased thickness that is not formed by the longitudinal edge of the bottom layer. Alternatively, the inner longitudinal edges of layers 103 and 104 may face a side edge with increased thickness that is formed by the longitudinal edge of the bottom layer.

[0298] Preferably, there is a small gap between the inner edge and the thickened side edge of the corresponding layers 103 and 104, so that the inner edge does not protrude all the way to the side edge, that is, it does not stay on or above the side edge.

[0299] Figure 47 A particularly preferred embodiment is shown, wherein the other two layers 103, 104 overlap themselves. The overlapping edge regions of the respective layers 103, 104 can have a thickness that is not reduced. Thus, layers 103 and 104 increase the thickness in the form of a simple overlap. Barrier layer 102 can be designed according to one embodiment described herein, particularly having a simple overlap or folded seam with itself in the seam region. The respective overlaps of layers 102, 103, and 104 are set to be offset from each other, so that there is no sum of thickness differences.

[0300] The inner longitudinal edges of the two layers 103 and 104 face the descending side edge of the lower layer with increasing thickness, and the other end is guided above the increasing thickness, such that the outer longitudinal edges of the corresponding layers 103 and 104 overlap with the inner longitudinal edges of the corresponding layers 103 and 104.

[0301] like Figure 47 As shown, the inner longitudinal edges of layers 103 and 104 can face the same side edge where the thickness increases. As shown in the example, the inner longitudinal edges of layers 103 and 104 can both be located on the left side where the thickness increases. As shown in the example, the outer longitudinal edges of layers 103 and 104 are also on the same side where the thickness increases in each case, i.e., on the side where the inner longitudinal edges of layers 103 and 104 also exist.

[0302] Preferably, there is a small gap between the inner edge and the thickened side edge of the corresponding layers 103 and 104, so that the inner edge does not protrude all the way to the side edge, that is, it does not stay on or above the side edge.

[0303] The additional layer is preferably with Figure 47 The outer paper or kraft paper layer 105 shown is arranged in the same manner. The inner longitudinal edge of layer 105 faces the outer longitudinal edge of layer 104, which forms a rising edge with increased thickness.

[0304] Basically, it should be noted that, Figure 47In variations and other variations, the number of layers 103, 104 located between the barrier layer 102 and the outer paper or kraft paper layer 105 can be greater than 2. Preferably, there are one to five intermediate layers 103, 104 made of paper or kraft paper between the barrier layer 102 and the outer paper or kraft paper layer 105, particularly two to three intermediate layers 103, 104.

[0305] Preferably, there are two to six intermediate layers 103, 104 made of paper or kraft paper between the barrier layer 102 and the outer barrier layer 106, especially three to four intermediate layers 103, 104.

[0306] For each of the intermediate layers 103 and 104, preferably, the inner or outer longitudinal edge of the can shell in the form of a wound layer of paper or paperboard material faces the side edge where the thickness increases due to the longitudinal seam of the barrier layer.

[0307] For at least one, preferably two, three, or four, of the intermediate layers 103, 104, and optional layer 105, in the embodiments, it is specified that the inner longitudinal edge of at least one of the additional layers 103, 104, and optional layer 105 of the tank shell 101 faces the side edge with increased thickness caused by the longitudinal seam, and the outer longitudinal edge of the corresponding layer 103, 104, 105 overlaps with the inner longitudinal edge of the same layer 103, 104, 105. For all layers designed in this way, preferably, the overlapping area of ​​the two longitudinal regions of the corresponding layer is twice the material thickness of the layer, and the overlapping areas are arranged to be offset from each other in the circumferential direction. Figure 47 As shown, the overlapping areas are preferably arranged adjacent to each other, with the innermost first overlapping area of ​​these layers adjacent to the side edge of the increased thickness of the barrier layer 102, while the other overlapping areas of the other layers are adjacent to the outer longitudinal edge of the bottom layer.

[0308] In the overlapping area, the corresponding intermediate layers 103, 104 and optional layer 105 are preferably adhered to themselves, in particular glued to themselves.

[0309] Figure 48 and Figure 49 An embodiment is shown in which the sealing material surrounds the entire inner longitudinal edge of the barrier layer 102 or the inner longitudinal edge of the paper (especially the kraft paper layer 107), such that the sealing material is present on both sides of the inner edge region of the inner paper (especially the kraft paper layer 107). The mesh material of the barrier layer 102 is preferably already present in this manner before winding or during feeding to the winding device. Alternatively, the sealing material can be wrapped around the edges of the mesh material during feeding to the mandrel of the winding device.

[0310] Figure 48The barrier film of the barrier lamination 108 or barrier layer 102 is shown to be designed to surround the inner longitudinal edge of the paper (particularly the kraft paper layer 107). During winding, the outer edge region of the barrier layer 102 lies above the folded-back edge region of the barrier lamination 108 or barrier film, which protrudes beyond the longitudinal edge of the paper (particularly the kraft paper layer 107).

[0311] Figure 49 A sealing strip 110 is shown, which surrounds the inner longitudinal edge of the barrier layer 102, and thus also the inner longitudinal edge of the U-shaped paper (particularly the kraft paper layer 107). During winding, the outer edge region of the barrier layer 102 lies above the folded-back edge region of the sealing strip 110, which protrudes beyond the longitudinal edge of the paper (particularly the kraft paper layer 107). Instead of the sealing strip 110, a coating with a sealing material can also be applied in a U-shape around the inner longitudinal edge of the barrier layer 102 in the same manner. The coating can be applied in liquid or gas form or as plasma before or during the feeding of the material of the barrier layer 102 to the mandrel of the winding machine. Inside the can housing, the sealing strip 110 or the coating covers the edge region of the barrier laminate 108 or the barrier film.

[0312] In a further embodiment, in Figure 41 , Figure 39 , Figure 37 , Figure 34 , Figure 28 , Figure 21 , Figure 18 In variations of the embodiments, instead of or in addition to the sealing strip 110, there exists a coating applied to the already wound annular tube, or preferably to individual tank shells already cut from the annular tube, wherein the coating is made of a sealing material forming the seams of the barrier layer. Similar to the sealing strip 110, the coating can be applied as a strip, only around the inner longitudinal edge region of the barrier laminate structure 108. Alternatively, the coating can also be applied to the cut edges of the tank shell and / or as a strip on the seams of the outermost layer of the tank shell.

[0313] In another embodiment, the coating is applied to the entire interior of the can shell. Optionally, the coating may also be applied to the cut edges of the can shell and / or its entire exterior. In all embodiments described herein, additional coating may be applied to the can shell cut from the annular tube of the winding machine.

Claims

1. A can (1) comprising a solid, liquid, and / or gaseous medium capable of having or being capable of generating such overpressure during transport or storage, the can having a cylindrical can shell (101) primarily composed of paper or cardboard material and comprising at least two wound layers, the can shell being closed at the bottom with a bottom element (4) and at the top with a cap element (5). Its features are, The innermost layer of the tank shell (101) consists of a linearly wound barrier layer (102), which has a longitudinal seam extending in the longitudinal direction of the tank (1), wherein, a) The longitudinal joint is sealed on the inside by a thin film layer of the barrier layer (102), the thin film layer overlapping the barrier layer (102) in the region of the longitudinal joint, or b) The longitudinal joint is sealed by a sealing strip (110) extending linearly in the longitudinal direction of the tank, or c) The longitudinal seam is designed as a folded seam, and the inner or outer longitudinal edges of the subsequent layers (103, 104) of the can shell (101) in the form of a wound layer made of paper or cardboard material face the side edges with increased thickness due to the folded seam; The barrier layer (102) has an increased thickness at the longitudinal seam extending in the longitudinal direction of the can (1). Outside the barrier layer (102) are two subsequent layers (103, 104) in the form of a wound layer of paper or paperboard material of the can shell (101). In this embodiment, each of the two subsequent layers (103, 104) of the tank shell overlaps itself, and there is no reduction in thickness in the area of ​​self-overlapping, with the inner longitudinal edge of the corresponding layer facing the side edge with increased thickness.

2. The tank according to claim 1, characterized in that, The barrier layer (102) is a laminated structure made of an inner anti-diffusion film or an inner anti-diffusion barrier laminate (108) and an outer cardboard or paper layer (107). The barrier layer (102) has a first edge region that overlaps with the second edge region of the barrier layer (102) in the region of the longitudinal seam.

3. The tank according to claim 2, characterized in that, The barrier layer (102) includes an inner anti-diffusion film or an inner anti-diffusion barrier laminate (108) and an outer cardboard or paper layer (107) in the first edge region, and the inner edge of the first edge region is sealed by a sealing strip (110).

4. The tank according to claim 2, characterized in that, The barrier layer (102) includes only the internal anti-diffusion membrane or the internal anti-diffusion barrier laminate (108) in the first edge region or at least in the outer region of the first edge region, wherein the internal anti-diffusion membrane or the internal anti-diffusion barrier laminate (108) in the first edge region abuts against the internal anti-diffusion membrane or the internal anti-diffusion barrier laminate (108) in the second edge region.

5. The tank according to any one of claims 1 to 4, characterized in that, The barrier layer (102) is a laminated structure made of an inner anti-diffusion film or an inner anti-diffusion barrier laminate (108) and an outer cardboard or paper layer (107). The cardboard or paper surface of the barrier layer (102) is directly adhered to the inner layer of the two subsequent layers (103, 104) made of paper or cardboard material.

6. The tank according to claim 5, characterized in that, The cardboard or paper surface of the barrier layer (102) and the inner layers of the two subsequent layers (103, 104) made of paper or cardboard material are directly glued to each other.

7. The tank according to any one of claims 1 to 4, characterized in that, The barrier layer (102) is a prefabricated laminated structure consisting of an inner anti-diffusion barrier laminated structure (108) and an outer cardboard or paper layer (107). The barrier layer (102) has a layer thickness of 0.098 mm to 0.145 mm, wherein the outer cardboard or paper layer (107) of the barrier layer (102) has a layer thickness of 0.065 mm to 0.090 mm, and the anti-diffusion barrier film or anti-diffusion barrier laminated structure (108) has a layer thickness of 0.033 mm to 0.055 mm.

8. The tank according to claim 7, characterized in that, The outer cardboard or paper layer (107) is an outer kraft paper layer.

9. The tank according to any one of claims 1 to 4, characterized in that, The inner layer of the two subsequent layers (103, 104) made of kraft paper is attached above the outside of the barrier layer (102). The inner kraft paper surface of the inner layer of the two subsequent layers (103, 104) is adhered to the kraft paper surface of the barrier layer (102), and the outer kraft paper surface of the inner layer of the two subsequent layers (103, 104) is adhered to the cardboard or paper surface of the outer layer of the two subsequent layers (103, 104) made of paper or paperboard material.

10. The can according to claim 9, characterized in that, The inner layer of the two subsequent layers (103, 104) made of kraft paper is glued to the outside of the barrier layer (102), the inner kraft paper surface of the inner layer of the two subsequent layers (103, 104) is glued to the kraft paper surface of the barrier layer (102), and the outer kraft paper surface of the inner layer of the two subsequent layers (103, 104) is glued to the paperboard or paper surface of the outer layer of the two subsequent layers (103, 104) made of paper or paperboard material.

11. The can according to claim 9, characterized in that, The outer layer of the two subsequent layers (103, 104) is kraft paper.

12. The tank according to claim 1, characterized in that, The barrier layer (102) itself consists of one or more foil layers without an outer cardboard or paper layer (107), and the barrier layer (102) itself simply overlaps in the area of ​​the longitudinal seam.

13. The tank according to claim 1, characterized in that, The barrier layer (102) is a laminated structure of an inner anti-diffusion film or an inner anti-diffusion barrier laminate (108) and an outer cardboard or paper layer (107). The two edges of the barrier layer (102) meet in the longitudinal seam area to form a butt joint, and the adjacent area is sealed with a sealing strip (110).

14. The tank according to claim 1, characterized in that, The barrier layer (102) is a laminated structure made of an inner anti-diffusion film or an inner anti-diffusion barrier laminate (108) and an outer cardboard or paper layer (107), wherein at the inner cut edge of the barrier layer (102), at least one film layer of the inner anti-diffusion film or the inner anti-diffusion barrier laminate (108) is located in a U-shape surrounding the outer cardboard or paper layer (107), or a sealing strip (110) is located in a U-shape surrounding the inner cut edge of the barrier layer (102).

15. The can according to any one of claims 1 to 4, characterized in that, The medium is a carbonated beverage.

16. The tank according to any one of claims 1 to 4, characterized in that, The outer sealing layer of the tank shell (101) has the form of a tubular sleeve made of moisture-proof material, which also covers the two cut edges of the tank shell (101).

17. The tank according to claim 16, characterized in that, The tubular sleeve overlaps with the longitudinally wound barrier layer (102) of the tank shell (101).

18. The tank according to any one of claims 2 to 4 and claims 12 to 14, characterized in that, When the outer cardboard or paper layer (107) is an outer paper layer, the paper is kraft paper.

19. A method for manufacturing a can according to any one of claims 1 to 18, characterized in that, In the first step, the can shell is made by a continuously operating winding machine, wherein each layer is applied to a winding mandrel and the layers are continuously connected to each other, wherein the barrier layer (102) is provided with a longitudinal seam extending in the longitudinal direction during winding, and subsequently, the resulting tube (27) is cut into a single cylindrical hollow body with openings on both sides. In the second step, the two open ends of the cylindrical hollow body are bent outward so that the ends have a circular cross-section with a diameter larger than that of the rest of the cylindrical hollow body; In the third step, the bottom end of the cylindrical hollow body is closed by the edge-rolling device using the bottom element (4); In the fourth step, the medium is filled into the hollow body that is closed at the bottom using a filling device (33); In the fifth step, the bottom-sealed, filled hollow body is sealed at the top using a cap element (5) with a crimping device. The fourth and fifth steps are performed on a filling system suitable for filling and sealing known aluminum cans.

20. The method according to claim 19, characterized in that, Before or after the second step, a tubular sleeve is placed on the outer side above the cylindrical hollow body, the tubular sleeve extending out of the cylindrical hollow body on both sides and folded into the interior of the cylindrical hollow body.

21. The method according to claim 20, characterized in that, The tubular sleeve is glued or welded to the barrier layer (102).

22. The method according to claim 19, characterized in that, The third step is performed on a filling system suitable for filling and sealing known aluminum cans.

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