Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
  • B65D3/10—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines characterised by form of integral or permanently secured end closure
  • B65D3/12—Flanged discs permanently secured, e.g. by adhesives or by heat-sealing
  • B65D3/14—Discs fitting within container end and secured by bending, rolling, or folding operations
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
  • B29C53/36—Bending and joining, e.g. for making hollow articles
  • B29C53/38—Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges
  • B29C53/48—Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges for articles of indefinite length, i.e. bending a strip progressively
  • B29C53/50—Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges for articles of indefinite length, i.e. bending a strip progressively using internal forming surfaces, e.g. mandrels
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
  • B29C53/56—Winding and joining, e.g. winding spirally
  • B29C53/562—Winding and joining, e.g. winding spirally spirally
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31C—MAKING WOUND ARTICLES, e.g. WOUND TUBES, OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31C3/00—Making tubes or pipes by feeding obliquely to the winding mandrel centre line
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31C—MAKING WOUND ARTICLES, e.g. WOUND TUBES, OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31C3/00—Making tubes or pipes by feeding obliquely to the winding mandrel centre line
  • B31C3/02—Making tubes or pipes by feeding obliquely to the winding mandrel centre line and inserting into a tube end a bottom to form a container
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31C—MAKING WOUND ARTICLES, e.g. WOUND TUBES, OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31C3/00—Making tubes or pipes by feeding obliquely to the winding mandrel centre line
  • B31C3/04—Seam processing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31D—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER, NOT PROVIDED FOR IN SUBCLASSES B31B OR B31C
  • B31D5/00—Multiple-step processes for making three-dimensional articles ; Making three-dimensional articles
  • B31D5/0086—Making hollow objects
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
  • B31F1/008—Shaping of tube ends, e.g. flanging, belling, closing, rim-rolling or corrugating; Fixing elements to tube ends
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
  • B31F1/008—Shaping of tube ends, e.g. flanging, belling, closing, rim-rolling or corrugating; Fixing elements to tube ends
  • B31F1/0093—Fixing elements to tube ends
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B1/00—Layered products having a non-planar shape
  • B32B1/08—Tubular products
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
  • B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B29/00—Layered products comprising a layer of paper or cardboard
  • B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
  • B32B29/005—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to another layer of paper or cardboard layer
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
  • B32B7/04—Interconnection of layers
  • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
  • B65B3/00—Packaging plastic material, semiliquids, liquids or mixed solids and liquids, in individual containers or receptacles, e.g. bags, sacks, boxes, cartons, cans, or jars
  • B65B3/02—Machines characterised by the incorporation of means for making the containers or receptacles
  • B65B3/027—Making containers from separate body and end-parts
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
  • B65D3/02—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines characterised by shape
  • B65D3/04—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines characterised by shape essentially cylindrical
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
  • B65D3/22—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines with double walls; with walls incorporating air-chambers; with walls made of laminated material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B2105/00—Rigid or semi-rigid containers made by assembling separate sheets, blanks or webs
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B2110/00—Shape of rigid or semi-rigid containers
  • B31B2110/20—Shape of rigid or semi-rigid containers having a curved cross section, e.g. circular
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/70—Other properties
  • B32B2307/724—Permeability to gases, adsorption
  • B32B2307/7242—Non-permeable
  • B32B2307/7246—Water vapor barrier
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/70—Other properties
  • B32B2307/726—Permeability to liquids, absorption
  • B32B2307/7265—Non-permeable
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/70—Other properties
  • B32B2307/732—Dimensional properties
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/70—Other properties
  • B32B2307/75—Printability
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2439/00—Containers; Receptacles
  • B32B2439/40—Closed containers
  • B32B2439/66—Cans, tins
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2439/00—Containers; Receptacles
  • B32B2439/70—Food packaging

Definitions

• the invention relates to a pressure-resistant can with a can jacket made of composite material.
• a pressure-resistant can is a can for the packaging of media that are under pressure or media that can develop such pressure during storage, transport or use.
• the invention thus relates to a fluid container, in particular also a beverage container, which can also be used for outgassing canned beverages such as carbonated mineral water, sweetened beverages, energy drinks or beers because it is a special feature that it is sufficiently pressure-resistant for these purposes. Depending on the version, it is suitable for all types of spray cans with even higher internal pressures.
• the invention relates to a technical production and logistics process that enables the use of such a beverage can to enable the beverage filler and, above all, the can filler to produce the containers on site and as required, preferably synchronously with an existing bottling plant.
• conventional canning companies do not have to modify their canning lines to introduce this new fluid container or beverage container, but can continue to use them seamlessly. They are able to produce their own cans, and the space required for this is a small fraction of the space required for the previously essential buffer store of empty aluminum cans for later filling.
• multi-layer packaging with a packaging sleeve made of paper or cardboard composite material is known, the individual layers of which are either straight or diagonally wound around the longitudinal direction of a mandrel and thus have joint areas with themselves running in the longitudinal direction of the packaging sleeve, or spirally around the longitudinal direction of the Have packaging jacket running shock areas with themselves.
• This packaging can have an inner barrier layer which has a tight fold seam in the joint area of its two edges.
• Cardboard and paper materials are generally used as the composite material of the sheets.
• Such can jackets have hitherto been used for general packaging purposes, for example for packaging powders such as detergents, cocoa powder, or for snacks such as crisps, whereby in the case of foodstuffs the barrier layer on the one hand protects the foodstuff from the ingress of liquids and gases from the outside and on the other hand prevent others from escaping liquids and gases from the food or from the inside of the packaging sleeve.
• a disadvantage of the packaging for carbonated beverages described in WO 9959882 A9 is their special shape, which on the one hand requires its own filling and sealing systems and on the other hand deviates from the shape of a beverage can that is familiar to consumers.
• a disadvantage of the packaging for carbonated beverages described in EP 0101139 A2 is their special shape, which on the one hand requires its own filling and sealing systems and on the other hand deviates from the shape of a beverage can familiar to the consumer, particularly in the area of the base and the lid.
• a composite can for carbonated drinks is known from DE202007010192U1, the jacket of which consists mainly of paper or cardboard material, the wall thickness being specified as 0.5545 mm.
• the disadvantage of DE202007010192U 1 is that the cover consists of a thick sulfate cardboard coated on both sides, which overlaps itself, resulting in a section that is much more widespread than the rest of the cover.
• Another disadvantage is that the lateral edge of the inner and outer edge of the laminate is exposed and therefore has to be additionally sealed, for example with tape.
• WO2012155890A1 describes packaging for carbonated beverages with a jacket made of composite material, with the jacket largely consisting of paper or cardboard material.
• the jacket thickness (or layer thickness) of the composite jacket of the can is between 0.5 and 0.8 mm, with the thickness of the barrier film being 50-120 ⁇ m.
• a disadvantage of WO2012155890A1 is that the entire laminate overlaps itself, which results in a section that is much wider than the rest of the jacket.
• Another disadvantage is that the lateral edge of the inner and outer edge of the laminate is exposed and therefore has to be additionally sealed, for example with tape.
• US Pat. No. 3,687,351 A1 discloses a composite can for carbonated beverages, the shell of which consists mainly of paper or cardboard material, the shell thickness being approximately 0.48 mm.
• the disadvantage is that the layer structure is a thick aluminum layer with a layer thickness of approximately 25 mpi having.
• US Pat. No. 4,642,252 describes packaging for carbonated beverages with jackets made of composite material, where the jacket can consist largely of paper or cardboard material.
• the jacket thickness of the exemplary embodiment according to FIG. 1, FIG. 8 and FIG. 9 is approximately 900 mpi, ie 0.9 mm.
• a disadvantage of US Pat. No. 4,642,252 is that the innermost layer, namely the barrier layer, is wound in a spiral, which increases the length of its folded seam.
• US Pat. No. 4,766,019 proposes a can for carbonated beverages which has a casing made up of several layers of plastic.
• the jacket thickness (or layer thickness) of the jacket is specified as 22 mils, ie approx. 0.56 mm, in one exemplary embodiment.
• US Pat. No. 4,766,019 states that the jacket thickness should be less than 30mils (0.762mm) so that the plastic jacket can be sealed with conventional aluminum lids.
• the disadvantage is that the jacket is made entirely of plastic, which does not seem sustainable.
• the innermost barrier layer is extruded onto a mandrel in US Pat. No. 4,766,019.
• US4181239A also shows a can with a plastic jacket, the disadvantage being that the can jacket is made up purely of plastic layers.
• US Pat. No. 4,181,239A states that the jacket thickness should be between 85 and 770 ⁇ m, preferably between 100 and 400 mpi.
• the prior art shows that it was recognized that the can jacket must not exceed a certain thickness so that it can still be closed with standard aluminum can lids from conventional aluminum cans. Secondly, it seems to have been recognized, at least in the case of can jackets made from several wound individual layers, that the can jacket should not exhibit any major deviations in its layer thickness over the circumference.
• the innermost layer is designed as a thin plastic film or a laminate of different plastic films and possibly an aluminum foil US4181239A, US4766019, and US4642252.
• US Pat. No. 4,642,252 it is also provided that the spiral folded seam of the barrier laminate made of plastic foils and an aluminum foil is laminated by an intermediate layer made of paper.
• US2020189791A1 discloses a can containing a liquid and/or a gaseous medium which has overpressure or develops such during transport or storage, the cylindrical can jacket of the can mainly consisting of paper or cardboard material and having a bottom element at the bottom and a bottom element at the top lid is closed, the can withstanding an internal pressure of at least 5 bar, the innermost layer of the can jacket consisting of a straightly wound barrier layer which has a fold seam running in the longitudinal direction of the can with itself, the barrier layer being a prefabricated laminate of an inner diffusion-tight barrier film or an inner diffusion-tight barrier laminate and an outer layer of kraft paper.
• the object on which the invention is based is to further improve a marketable can jacket made of composite material for a can for pressurized media, in particular carbonated beverages, with the can jacket being able to reliably withstand the prevailing or possible internal pressure of such media and being mainly made of paper or cardboard material.
• a can containing a solid, liquid and/or a gaseous medium which can have overpressure or can develop such pressure during transport or storage
• the cylindrical can jacket of the can being made mainly of paper or paper consists of cardboard material and comprises at least two wound layers and is closed at the bottom with a base element and at the top with a lid element, the innermost layer of the can jacket consisting of a straightly wound barrier layer which has a longitudinal seam with itself running in the longitudinal direction of the can, the Barrier layer is sealed by one of the following variants:
• the longitudinal seam is sealed on the inside by a film layer of the barrier layer, which simply overlaps the barrier layer in the area of the longitudinal seam, or
• the longitudinal seam is sealed by a sealing strip running straight in the longitudinal direction of the can, or
• the longitudinal seam is designed as a folded seam and the inner or outer longitudinal edge of a further layer of the can jacket in the form of a wound layer of paper or cardboard material faces a flank of the increase in thickness resulting from the folded seam.
• a can in a further embodiment variant, containing a solid, liquid and/or a gaseous medium which can have overpressure or can develop such pressure during transport or storage, the cylindrical can jacket of the can being made mainly of paper or cardboard material, wherein the can jacket has a barrier layer on the inside and a barrier layer on the outside and in between comprises at least two wound middle layers of paper or cardboard material and is closed at the bottom with a bottom element and at the top with a lid element, with the innermost layer of the
• the can jacket consists of a straightly wound barrier layer, which has a longitudinal seam with itself running in the longitudinal direction of the can, with the longitudinal seam forming an increase in thickness in the layer structure, with the inner or outer longitudinal edge of at least one of the middle layers of a flank facing the increase in thickness resulting from the longitudinal seam lies.
• One embodiment provides that the inner longitudinal edge of at least one of the other layers of the can jacket faces a flank of the increase in thickness resulting from the longitudinal seam and the outer longitudinal edge of this layer overlaps the inner longitudinal edge of this layer.
• a variant provides that the inner longitudinal edges of at least two of the other layers of the can jacket each face a flank of the increase in thickness resulting from the longitudinal seam and the outer longitudinal edge of the respective layer overlaps the inner longitudinal edge of this layer.
• the barrier layer is a laminate made of an inner diffusion-tight film or an inner diffusion-tight barrier laminate and an outer layer of cardboard or paper or kraft paper, the barrier layer having a first edge area which overlaps a second edge area of the barrier layer in the area of the longitudinal seam.
• the barrier layer has the inner diffusion-tight film or an inner diffusion-tight barrier laminate and the outer layer of cardboard or paper or kraft paper in the first edge area, with the inner edge of the first edge area being sealed by a sealing strip.
• barrier layer in the first edge area or at least in the outer area of the first edge area has only the inner diffusion-tight film or the inner diffusion-tight barrier laminate, with the inner diffusion-tight film or the inner diffusion-tight barrier laminate of the first edge area on the inner diffusion-tight film or rests against the inner diffusion-tight barrier laminate of the second edge area.
• barrier layer has only the cardboard or paper or kraft paper layer in the second edge area or at least in the outer area of the second edge area.
• An embodiment variant provides that the cardboard or paper or kraft paper layer of the barrier layer does not overlap.
• a variant provides that the cardboard or paper or kraft paper layer of the barrier layer overlaps.
• the longitudinal seam of the barrier layer running in the longitudinal direction of the can has an increase in thickness and the inner or outer longitudinal edge of the layer of the can jacket that follows the barrier layer, in the form of a wound layer of paper or cardboard material, faces a flank of the increase in thickness draines
• the longitudinal seam of the barrier layer running in the longitudinal direction of the can has an increase in thickness and a subsequent layer of the can jacket in the form of a wound layer of paper or cardboard material is arranged around the barrier layer, so that the increase in thickness caused by the longitudinal seam at the Position is present, with the inner or outer longitudinal edge of the layer of the can jacket following the layer, in the form of a wound layer of paper or cardboard material, facing a flank of the increase in thickness.
• a variant provides that both longitudinal edges of one of the two subsequent layers of the can jacket face the two opposite flanks of the increase in thickness.
• a variant provides that the outer of the two longitudinal edges of at least one of the two subsequent layers of the can jacket overlaps the inner of the two longitudinal edges of the same layer.
• a variant provides that the two subsequent layers of the can jacket overlap each other and are present in the overlapping area with themselves without reduction in thickness, with the inner longitudinal edge of the respective layer facing a flank of the increase in thickness.
• the barrier layer itself consists of one or more film layers and has no cardboard or paper or kraft paper layer, with the barrier layer simply overlapping itself in the area of the longitudinal seam.
• the barrier layer is a laminate of an inner diffusion-tight film or an inner diffusion-tight barrier laminate and an outer layer of cardboard or paper or kraft paper, with the two edges of the barrier layer meeting in the area of the longitudinal seam butt and the butt area by a sealing strip is sealed.
• the barrier layer is a laminate of an inner diffusion-tight film or an inner diffusion-tight barrier laminate and an outer layer of cardboard or paper or kraft paper, with either the diffusion-tight film or at least one film layer of the barrier laminate being U-shaped on the inner cut edge of the barrier layer is placed around the kraft paper layer or a sealing strip is placed in a U-shape around the inner cut edge of the barrier layer
• the barrier layer is a laminate of an inner diffusion-tight film or an inner diffusion-tight barrier laminate and an outer layer of cardboard or paper, in particular kraft paper, with at least one further layer of paper or paper being wound around the barrier layer of the can jacket.
• Cardboard material is present, with the cardboard or paper surfaces lying against one another of the barrier layer and the wound layer of paper or cardboard material being glued directly to one another, in particular glued.
• the barrier layer is formed as a laminate of foil and cardboard or paper, preferably kraft paper
• the foil is relieved, particularly in the area of the overlap of the longitudinal seam, since the tensile forces are dissipated by the cardboard or paper, preferably kraft paper, through the straight longitudinal seam the tensile forces act advantageously in the circumferential direction and no additional forces are introduced in the longitudinal direction of the can, as would be the case with spiral winding of the innermost layer or the barrier layer.
• the innermost layer is made of paper material on the outside and the next layer is made of paper material on the inside, these two paper materials can be glued directly to one another, in particular glued, so that the adhesive can penetrate the fibers of the paper material on both sides and thus the fibers of a paper layer can also penetrate directly through the adhesive bonded to the fibers of the other paper layer.
• the advantage of this is the particularly firm hold, which cannot be achieved in this way if there were a plastic barrier layer between the paper materials.
• the barrier layer preferably has a layer thickness of 0.060 mm to 0.145 mm.
• the kraft paper layer of the barrier layer preferably has a layer 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.
• the diffusion-tight barrier film or the diffusion-tight barrier laminate preferably has a layer thickness of 0.033 mm to 0.055 mm.
• the barrier laminate preferably comprises an aluminum layer and at least two plastic layers, the aluminum layer being present between two plastic layers.
• At least two further layers of cardboard or paper, in particular kraft paper, which are wound separately from one another, are preferably attached over the barrier layer.
• the can preferably withstands an internal pressure of at least 5 bar.
• the at least two layers of cardboard or paper, in particular kraft paper do not overlap themselves, or each have at least one edge region with reduced thickness in the region of overlap with themselves.
• the respective layer thickness of at least two of the further layers of cardboard or paper, in particular kraft paper, is preferably selected from the range of 140 ⁇ m to 175 ⁇ m.
• the respective tensile strength of the kraft papers of the kraft paper layers is at least 10 kN/m (MD) and at least 5 kN/m (CD).
• the further layers of kraft paper and/or further layers of paper or cardboard material are preferably each wound lengthwise. Their abutting or overlapping areas are preferably located at different peripheral areas, or the abutting edges of two layers of cardboard or paper, in particular kraft paper, that face one another are preferably offset relative to one another.
• the joint or overlapping area of the cardboard or paper layer, in particular kraft paper layer, adjoining the barrier layer is offset relative to the longitudinal seam of the barrier layer.
• the can preferably has an outer sealing layer applied around the cardboard or paper layers, in particular kraft paper layers, which can be present, for example, as a film, laminate, or coated paper.
• the barrier layer preferably at least two additional layers of cardboard or paper, in particular kraft paper, and preferably also the outer sealing layer are preferably produced continuously on a winding system to form a hollow tube, from which individual hollow cylinders are cut off.
• the outermost of the at least two layers of cardboard or paper, in particular kraft paper can be present as a laminate of a layer of cardboard or paper, in particular kraft paper, and a barrier film before winding, with the barrier film lying on the outside of the composite can jacket after winding has taken place.
• the outer barrier film or sealing layer on the outside of the composite can shell may be a semi-permeable film which allows moisture to escape from the can shell but does not allow moisture to enter the can shell from the outside.
• the material of the outer barrier film or sealing layer on the outside of the composite can shell can be recyclable or renewable PE, biodegradable PE, EVOH or other known barrier materials.
• an outer sealing layer is applied only after the individual hollow bodies have been cut off. This can be done by pulling a tubular sleeve made of moisture-proof material over the outside of the individual hollow bodies and attaching them to them.
• a shrink tube formed from a shrink film, is pulled over the cylindrical hollow body and formed on the can jacket by the action of heat and the diameter reduction associated therewith.
• the two cut edges of the hollow body are also covered by the tubular casing, so that no moisture can penetrate into them.
• the sleeve or the shrink tube is advantageously placed before the two end regions of the individual hollow bodies are shaped outwards.
• the sleeve or the heat-shrinkable tube can be glued or molded onto the hollow body before or during the shaping of the end regions of the hollow body.
• the sleeve can also be molded on or turned inwards on the hollow body if it already has the end regions formed outwards.
• the tubular casing preferably projects at least 3 mm, in particular at least 4 mm, into the interior of the hollow body at both ends.
• the tubular casing can be welded to the barrier layer or the barrier laminate inside the hollow body in their overlapping area.
• the tubular casing comprises a plastic film or consists of a plastic film.
• the plastic film preferably consists of a polyolefin.
• the tubular casing can be a shrink sleeve or a stretch sleeve.
• the paper layer of the hollow body present under the tubular casing is preferably printed.
• the printing can be applied before this paper layer is wound, or it can be applied to the tubular body after the winding, either already on the endless tube on the mandrel of the winding machine or after the endless tube has been cut on the individual hollow bodies.
• the printing can also be on the inside and/or outside of the tubular casing.
• the tubular casing is preferably attached to the heavily or completely dried hollow bodies at the end of a transport route of the individual hollow bodies cut from the endless tube.
• the hollow bodies are preferably moved continuously along the transport path. Drying devices can be arranged along the transport route, or the transport route can lead through at least one drying device. Less preferably, the hollow bodies can be temporarily stored until they have dried sufficiently, for example in a drying device.
• tubular casing is pulled over one or more hollow bodies in the longitudinal direction, or one or more hollow bodies is pushed into the tubular casing in a longitudinal orientation.
• the tubular sleeve protrudes beyond each can jacket at both of its ends, is folded inwards there and glued or preferably welded to the barrier layer (inner liner) of the can jacket.
• the tubular casings can be supplied individually or as a continuous tube, in which case the continuous tube is severed after the insertion of one or more can jackets after the respective can jacket.
• the outer sealing layer can also be applied by coating them or wrapping them with a film, with the two cut edges of the hollow bodies preferably also being covered by the coating or the film in these cases.
• the application of the outer sealing layer after the individual hollow bodies have been cut off is particularly advantageous if, due to the materials used, in particular the glue and the amount applied, the layered structure would not dry sufficiently over the two cut edges of the hollow body if the outside of the layered structure was already in the winding system is sealed.
• the outer barrier layer in the form of a foil the outermost of the at least two layers of cardboard or paper, in particular kraft paper, can be coated on one side with barrier material, for example paint, on the subsequent outside before winding.
• barrier material such as paint, for example, can be applied to the outside of the hollow tube or the individual hollow cylinders after production.
• an aqueous polymer coating or a UV varnish can be used as the varnish.
• the cut edges of the individual hollow cylinders, on which the paper material of the cardboard or paper layers, in particular kraft paper layers, is exposed, are preferably sealed, for example by applying a tape or a foil, or by coating with a barrier material, for example paint, waterproof glue or liquid plastic.
• the sealing of the cut edges is particularly preferably carried out by impregnation, i.e. by applying a liquid which penetrates or is sucked into the fiber matrix of the cardboard or paper layer, in particular kraft paper, at the cut edges and thus forms a liquid-resistant edge area in the cardboard or paper, in particular kraft paper .
• impregnation can also be used when the outermost layer of the can has one (in the case of an overlap) or two (in the case of a butt seam) exposed absorbent longitudinal edges.
• a polymer mixture in aqueous solution or as an aqueous emulsion is preferably used for impregnation.
• the cut edges of the individual hollow cylinders are preferably bent outwards in order to make it easier to place the base element and the cover, or to improve the hold of the base element and the cover on the hollow cylinder.
• a coating in the liquid or gaseous state of aggregation or as a plasma is applied to the barrier layer. In one embodiment, this coating can be applied after winding in the formed hollow body.
• a coating with silicon oxide (SiOx) is particularly preferred.
• the coating, in particular with SiOx is particularly advantageous in those design variants in which the barrier layer does not form a fold seam with itself, that is, for example, has a simple overlap or a butt seam with itself.
• the barrier layer can also include another oxide layer, in particular another semi-metal oxide layer or a metal oxide layer.
• a coating preferably takes place with or the coating contains nanocellulose, in particular microfibrillated cellulose (MFC).
• the cardboard or paper material, in particular kraft paper material, of the barrier layer preferably contains nanocellulose, in particular microfibrillated cellulose (MFC).
• Nanocellulose, in particular microfibrillated cellulose (MFC) can be used in the present invention as a film, in plastic films or in paper materials (therefore also in the other layers of cardboard or paper, in particular kraft paper material) in order to increase the barrier properties and/or strength.
• the can jackets can be closed with standard ends of aluminum cans and that the cans can also be filled and closed in standard filling systems for aluminum cans, since the can jacket does not exceed the maximum layer thickness required for this and in the area of the longitudinal seam of the barrier layer still has a permissible deviation in sheath thickness.
• Known winding mandrel systems using a round winding mandrel can advantageously be used to produce the hollow cylinder if the individual layers of the can jacket according to the invention are fed in, placed around the mandrel and preferably glued to one another over their entire surface, so that continuously operating standard systems with little adaptation effort are used to produce the can jacket according to the invention can become.
• a different structure of the can according to the invention is required so that it can be closed with standard can lids, or is a cylindrical body more pressure-resistant than a differently shaped body, for example an approximately rectangular body with rounded corners, which is quite common for general packaging purposes.
• a pressure-resistant can can be produced on a system which has hitherto been used for the packaging of conventional consumer goods.
• a barrier layer made of a cardboard or paper layer, in particular kraft paper and a barrier film or barrier laminate in the preferred thickness range according to the invention, the operating speed of the known system can be advantageously increased, since the barrier film or barrier laminate can be stretched on the dome is prevented, which is significantly stronger with a straight winding than with a spiral winding.
• the at least two additional kraft paper layers could also be wrapped diagonally around the barrier layer that has just been wrapped, with offsetting of the joint areas and beveling or Grading of the edge areas of the kraft paper can be done.
• the skew wrapping of the at least two further kraft paper plies may be in the same direction for each ply, or in opposite directions to each other.
• this embodiment variant with the further kraft paper layers wound at an angle has the disadvantage that the butt areas or overlapping areas of the kraft paper layers cross the longitudinal seam of the barrier layer, which can result in weak points at these points. In the case of the opposite winding, the butt areas or overlapping areas of the at least two kraft paper layers also cross, so that weak points can also result there.
• the at least two layers of cardboard or paper, in particular kraft paper, are therefore preferably also wound straight.
• a less preferred or advantageous possible modification based on the present invention could be seen in the use of paper or kraft paper webs laminated on one or both sides with plastic (especially PE) instead of the cardboard or paper layers, in particular kraft paper, and the connection of the layers to each other by welding together plastic layers of two layers that are lying next to each other. Accordingly, at least one layer would have a PE film on the outside and at least one other layer would have a PE film on the inside, which would be welded together when the layers were applied, in particular on the mandrel in a winding machine, in particular by ultrasonic welding.
• plastic especially PE
• PE-PE plastic-plastic
• the layered structure of a beverage carton could theoretically be used as the innermost layer of a can with a longitudinal seam (simple overlapping with an internal stripe as is usual with beverage cartons, or a folded seam) to at least to wrap another layer with an inner plastic layer (PE) and an outer layer of cardboard or paper, with the outermost layer of the layered structure having an outer layer of bamere, e.g. made of PE.
• the layered structure would be in the form of a cylinder and sealed with suitable closure elements (can base and can lid) instead of welding the layered structure to itself at the ends.
• FIG. 1 shows an individual representation of the fluid container according to the invention in the form of a beverage can according to a first embodiment.
• FIG. 2 shows a schematic sectional view through a beverage can from FIG. 1 made from two layers shown greatly enlarged.
• 3 shows a schematic sectional view through a beverage can according to a second, three-layer embodiment with layers shown greatly enlarged.
• Fig. 4 shows a schematic sectional view through a beverage can with a first layer with a barrier layer on its inside, with the two edge areas of the layer overlapping the winding, being guided outwards, then welded together with the barrier layers and then glued onto the wound layer and glued.
• Fig. 5 shows schematically the manufacturing process of the cylindrical can jackets
• Fig. 6 shows schematically the bending up of the edges of the can jacket
• Fig. 7 shows schematically the placement of a closure element.
• 8 illustrates another base or cover variant with a preformed contour in a diametric section, with a silicone-based sealing ring;
• Figure 9 illustrates the finished can in a longitudinal section in elevation, with the flanged tight edges on the bottom and lid.
• FIG. 10 shows a schematic of a first section of a system according to the invention for filling cardboard or paper composite can shells and/or aluminum can shells.
• FIG. 11 shows a schematic of a second section of a plant according to the invention for filling cardboard or paper composite can jackets and/or aluminum can jackets.
• FIG. 12 shows a schematic of a third section of a plant according to the invention for filling cardboard or paper composite can jackets and/or aluminum can jackets.
• FIG. 13 shows a longitudinal section through a first embodiment variant of the cylindrical can jacket according to the invention.
• Fig. 14 shows the layer structure of the first embodiment variant in a detailed view of the longitudinal section.
• Fig. 15 shows the layer structure of the first embodiment in a detailed view of a cross section through the
• FIG. 16 shows a longitudinal section through a second embodiment variant of the cylindrical can jacket according to the invention.
• FIG. 17 shows the layer structure of the second embodiment variant in a detailed view of the longitudinal section.
• Fig. 18 shows the layer structure of the second embodiment in a detailed view of a cross section through the
• Fig. 20 shows the layer structure of the third embodiment in a detailed view of the longitudinal section.
• Fig. 21 shows the layer structure of the third embodiment variant in a detailed view of a cross section through the
• FIG. 22 shows a longitudinal section through a fourth embodiment variant of the cylindrical can jacket according to the invention.
• FIG. 23 shows the layer structure of the fourth embodiment in a detailed view of the longitudinal section.
• FIG. 24 shows the layer structure of the fourth embodiment variant in a detailed view of a cross section through the
• FIG. 25 shows a longitudinal section through a fifth embodiment variant of the cylindrical can jacket according to the invention.
• Fig. 27 shows the layer structure of the fifth embodiment variant in a detailed view of a cross section through the
• FIG. 28 shows the layer structure of a sixth embodiment variant in a detailed view of a cross section through the longitudinal seam of the barrier layer.
• FIG. 29 shows a longitudinal section through a seventh embodiment variant of the cylindrical can jacket according to the invention.
• FIG. 32 shows the layer structure of a cylindrical can jacket according to the invention in a detailed view of a cross section through the longitudinal seam of the barrier layer with sealing strips on the outer seam
• 33 schematically shows possible overlapping areas of the layers.
• 34 shows a variant of the further layer structure of a cylindrical can jacket adjoining the barrier layer in a longitudinal section.
• 35 shows a longitudinal section of a further variant of the further layer structure of a cylindrical can jacket adjoining the barrier layer.
• FIG. 38 illustrates a third embodiment variant with edges of the barrier layer and the further layer lying on top of which abut.
• 41 illustrates a sixth embodiment variant with butt edges of the barrier layer and the further layer lying above it.
• 42 illustrates a seventh embodiment variant with butt edges of the barrier layer and the additional layer above it.
• FIG 43 illustrates a first embodiment variant with lamination of the increase in thickness in the first of the middle layers.
• Fig. 45 illustrates a first embodiment variant with self-overlapping middle layers.
• Fig. 46 illustrates a second variant embodiment with self-overlapping middle layers.
• Fig. 47 illustrates a third variant embodiment with self-overlapping middle layers.
• 49 illustrates an embodiment variant with a U-shaped seal of the barrier layer.
• the fluid container in particular also in its design as a beverage can, is designed as a pressure vessel and for this purpose has a hollow-cylindrical can body which includes an interior space for accommodating a beverage, a base element and a lid element, wherein the base element closes a first longitudinal end of the hollow-cylindrical can body and the lid element closes a second longitudinal end of the hollow-cylindrical can body.
• the can body includes at least one wrapped inner ply and one wrapped outer ply, i.e.
• Combinations of layers with exactly one wrap length and those with a little more are possible. These layers are preferably wound at right angles to the axis of the can body to be produced, which results in maximum compressive strength, because the necessary overlaps and thus the seams then have a minimum length.
• helical windings in which the longitudinal edges of the wound strips are joined to form narrow overlaps and seams, require longer seams.
• the wound inner material layer of the pressure-resistant and preferably also heat-resistant can has an axially running inner seam and is formed from a cardboard composite material or a kraft paper layer, which is preferably coated on one side on the side surface facing the can interior with a gas-tight and aroma-tight barrier composite, and the wound
• the outer layer of material has an outer seam and is preferably formed from a layer of kraft paper, the seam formed by the overlap preferably being offset from that of the inner layer of material with respect to the circumference of the can. If a third layer of carton composite material is present, its overlap or seam is again preferably offset relative to the seam of the then middle layer with respect to the circumference of the can.
• a beverage container or a cylindrical beverage can is provided in a structurally simple manner and inexpensively, which is characterized by a simple structure and the use of recyclable materials.
• a beverage can can be designed and manufactured to be sufficiently pressure-resistant, in particular by consisting of several layers and wrappings, so that it can also be used for carbonated beverages as well as for non-carbonated beverages and prints of up to 11 bar, although it is primarily made of bare cardboard composite material.
• their jacket consists largely of cardboard or kraft paper.
• This beverage can is harmless in terms of food law.
• the can body consists of cardboard or even of paper, namely kraft paper, and no longer of aluminum.
• This barrier composite is applied, for example, by means of a hot casting process using an extruder.
• a polyolefin layer and at least one layer of an adhesion promoter are suitable materials for the barrier composite.
• an additional layer of aluminum can be used, in which case the total area weight of this innermost layer can be approximately 60 g/m 2 to 130 g/m 2 .
• the barrier composite can additionally comprise a layer of ethylene-vinyl alcohol copolymer, with which a total area weight of 50 g/m 2 to 100 g/m 2 can be achieved.
• the kraft paper layer of the outer material layer is preferably coated on one side with a polyolefin layer on the side facing away from the interior of the can.
• This polyolefin layer has a weight per unit area of at least 10 g/m 2 and at most 50 g/m 2 and consists of polyethylene PE or polyethylene terephthalate PET.
• a basis weight of 20 g/m 2 has proven to be ideal.
• the advantageous barrier effect of polyethylene terephthalate PET can be used here. This beverage can therefore makes an important contribution to protecting the environment and reducing disposal waste.
• the kraft paper layer of the outer material layer is designed to be waterproof, printable or paintable on one side on the outer side facing away from the can interior. This means that external surfaces are available on which advertising messages can be printed or painted.
• the wound inner material layer and the wound outer material layer are preferably glued to one another over their entire surface. In this way it is ensured that the seams remain staggered relative to each other with respect to the circumference of the can and the pressure resistance is increased.
• a triple wrap is advantageously produced by applying at least one wrapped intermediate material layer between the wrapped inner material layer and the wrapped outer material layer, which is also formed by a kraft paper layer, wherein the inner layer of material, the at least one intermediate layer of material and the outer layer of material are glued together over the entire surface on the opposite layers of kraft paper.
• the at least one wound intermediate layer of material has an intermediate seam which is preferably offset relative to the inner seam and the outer seam with respect to the circumference of the winding.
• the staggered arrangement of the inner seam, intermediate seam and outer seam proves to be particularly advantageous in terms of tightness and pressure resistance for filling with carbonated drinks.
• a barrier composite of the innermost layer made of a polyolefin layer with at least one layer of an adhesion promoter has proven to be particularly advantageous.
• the barrier composite can also include a layer of aluminum and a total area weight of at least 60 g/m 2 and a maximum of 130 g/m 2 .
• the choice of material increases the weight of the fluid container only insignificantly, whereas the inner material layer gains in toughness through a suitable choice of material.
• a layer of ethylene-vinyl alcohol copolymer can be used instead of a single layer of aluminum, and the total area weight is then at least 50 g/m 2 and at most 100 g/m 2 .
• Ethylene-vinyl alcohol copolymer also has the properties necessary to form a barrier.
• a layer of polyvinyl alcohol can also be used as a barrier compound, with a total area weight of at least 50 g/m 2 and at most 100 g/m 2 .
• Polyvinyl alcohol has high tensile strength and flexibility.
• a kraft paper layer with a basis weight of at least 60 g/m 2 and at most 180 g/m 2 is suitable.
• the bottom element and/or the lid element can be made of metal, preferably of aluminium, for good pressure resistance of the can, as is conventional.
• a fluid container according to the invention in the form of a beverage can 1 is shown in a schematic representation of an individual part.
• This beverage can 1 comprises a tube section or a hollow-cylindrical can body 2 with a can interior 3 serving to hold the beverage, as well as a base element 4 and a cover element 5.
• the base element 4 serves to close a first longitudinal end 6 of the can body 2, with the cover element 5 being used for this purpose it is provided to close a second longitudinal end 7 of the can body 2 .
• the base element 4 and the cover element 5 are preferably made of metal, preferably aluminum.
• This beverage can 1 can have a height of 100 mm up to 250 mm with a diameter of 35 mm to 600 mm, a height of 100 mm with a diameter of 45 mm to 70 mm being preferred.
• Fig. 2 shows a first variant with a two-layer can body in a cross section, with layers shown greatly enlarged, in principle.
• a first kraft paper layer 18 with an inner polyolefin layer as a barrier composite was wrapped around a central cylindrical steel dome as the inner layer 11 and the edges lying in the direction of wrapping were glued or welded with a first seam 15 .
• a second layer of kraft paper 18 was then wound onto the first layer 11 as the outer layer of material 12 in such a way that the edges lying in the direction of winding are welded or glued to the seam 16 on a side of the can body 2 opposite the seam 15, so that a can body 2 with a hollow can interior 3 was created.
• Fig. 3 is a second embodiment of the beverage container 1 in a cross section through the can body
• the can body 2 by the structure of the can body 2, which consists of three layers of material 11, 14, 12 in this second embodiment, instead of just two layers.
• the following description applies to both embodiments, addressing the differences between the two embodiments.
• the can body 2 comprises a wound inner material layer 11 and a wound outer material layer 12.
• the can body 2 comprises a wound inner material layer 11 and a wound outer material layer 12.
• a further layer of material namely a wound intermediate layer of material 14 which is arranged between the inner layer of material 11 and the outer layer of material 12 .
• More than just one intermediate material layer 14 can also be arranged between the inner material layer 11 and the outer material layer 12, it being shown that three intermediate material layers 14 represent a kind of maximum and a further increase in the number of intermediate layers to increase stability is not necessary.
• the inner layer of material 11, the outer layer of material 12 and, in the second embodiment, the intermediate layer of material 14 are unwound from rolls of web material. Then their edge areas are preferably ground in a machine so that they form either an inclined surface or a step, so that the later overlapping edge areas are not thicker than those of the cardboard composite material layer itself.
• the material webs are perpendicular to their direction of travel and at right angles wound around a mandrel 23 to form the can body 2, for the manufacture of the can body 2 and the subsequent closed can 1.
• the then overlapping edge regions of the individual material layers are positively connected to one another by gluing.
• the wound layer of skin material 11 has an inner seam 15 and the outer layer of material 12 has an outer seam
• the intermediate material layer 14 accordingly has an intermediate seam
• the individual seams 15, 16 and possibly 17 are not arranged in identical circumferential positions, as can be seen from Fig. 3, but that the inner seam 15, the outer seam 16 in the first exemplary embodiment in FIG. 2 and in the second exemplary embodiment in FIG. 3, the intermediate seam 17 is additionally arranged at different circumferential positions after the material layers 11, 12 and optionally 14 have been glued together. Whether the inner seam 15 is arranged offset from the outer seam 16 by 180°, as shown in Fig. 2, or whether the seams 15, 16 and 17 are arranged offset from one another by only approx. 15°, as shown in Fig. 3 is not so important. It is advantageous that the seams 15, 16 and optionally 17 are offset relative to one another and are not located at the same circumferential position of the can body 2.
• the skin material sheet 11 and the skin material sheet 12 are each of a kraft paper sheet
• Each kraft paper layer 18 preferably has a basis weight of at least 40 g/m 2 and at most 180 g/m 2 , with a basis weight of at least 80 g/m 2 and at most 120 g/m 2 being preferred.
• sack paper with a high tear resistance can also be considered.
• the kraft paper layer 18 of the outer material layer 12 is coated on one side on the outer side surface facing away from the can interior 3 with a polyolefin layer 19 as a barrier composite.
• This two-layer structure of the outer material layer 12 is indicated schematically by the dashed line, the illustrations in FIGS. 2 and 3 not showing the real layer thicknesses.
• the polyolefin layer 19 preferably has a basis weight of at least 10 g/m 2 and at most 40 g/m 2 , with a basis weight of 20 g/m 2 being preferred.
• the polyolefin layer 19 can be provided with or without semi-permeable properties.
• the kraft paper layer 18 of the outer material layer 12 can be waterproof printed or varnished on one side on the outer side surface facing away from the can interior 3 .
• the inner material layer 11 is coated on one side on the side surface facing the can interior 3 with a gas-tight and aroma-tight barrier composite 20 .
• the two-layer structure is indicated schematically by the dashed line in the respective figures.
• the barrier composite 20 itself is preferably in turn multi-layered
• the inner material layer 11 can be coated on one side on the side surface facing the can interior 3 with a gas and aroma-tight layer.
• the two-layer structure is indicated schematically by the dashed line in the respective figures.
• the layer itself can preferably in turn be multi-layered be trained.
• the layer is preferably sprayed on, printed on or applied by coating such as plasma coating.
• the layer particularly preferably comprises an inorganic barrier material.
• the layer particularly preferably comprises a non-metallic, inorganic barrier material.
• the layer particularly preferably comprises silicon oxide (SiOx) as a barrier material.
• the layer is preferably applied directly to the paper material of the inner material layer 11 .
• the paper material of the inner material layer 11 can be provided with a thin plastic layer, preferably in the form of a primer, before the SiOx coating is applied.
• the inner material layer 11 can already be present as a laminate of a cardboard, paper, in particular kraft paper layer and a barrier film, with an additional SiOx layer being present on or in the barrier film.
• the layer can already be present on the inner material layer before it is wound, or it can have been applied to it.
• the layer can be applied after the inner material layer 11 has been wound, in particular after the entire hollow body has been wound. Plasma coating is particularly suitable for applying the barrier layer made of SiOx.
• the layer preferably contains nanocellulose, in particular microfibrillated cellulose (MFC).
• MFC microfibrillated cellulose
• the inner material layer 11 preferably contains nanocellulose, in particular microfibrillated cellulose (MFC).
• MFC microfibrillated cellulose
• a plastic barrier layer or a barrier composite can comprise a polyolefin layer and at least one layer of an adhesion promoter.
• the barrier composite 20 can then also have a layer made of aluminum, of ethylene-vinyl alcohol copolymer or of polyvinyl alcohol.
• the barrier composite 20 preferably has a total area weight of at least 60 g/m 2 and at most 130 g/m 2 , preferably 110 g/m 2 .
• the barrier composite 20 preferably has a total basis weight of at least 50 g/m 2 and at most 100 g/m 2 , preferably 70 g/m 2 .
• the inner material layer 11, the intermediate material layer 14 and the outer material layer 12 are preferably glued to one another over the entire surface on the opposite kraft paper layers 18.
• this fluid container which is described using the example of a beverage can, is primarily made of cardboard material and is suitable for both non-carbonated and carbonated beverages. It is a preferably three-part, linearly manufactured, primarily - for a uniform pressure absorption - cylindrical fluid container, with other shapes are theoretically possible, such as the shape of a 5 liter beer keg.
• the fluid container comprises a can body 2 made of a multi-layer cardboard and barrier cardboard composite and a base element 4 preferably made of metal, preferably aluminum, and a lid element 5 preferably made of metal, preferably also aluminum.
• the cover element 5 is also provided with a known device for opening, preferably a pull ring, it also being possible for means to be provided which allow reclosing.
• the innermost winding ie the innermost layer 11 acting as a barrier web
• a mandrel 23 As shown in FIGS. 4 and 5.
• an edge area of the layer projecting beyond the circumference of the winding is preferably placed on the outside over the other edge area.
• the two are preferred Overlying edge regions are connected to one another, beispielswese welded, by means of induction or ultrasonic welding if the plastic layer lies on top of the plastic layer at the overlap, or glued if at least one of the adjacent layers of the overlap is made of paper.
• an adhesive or filling material, in particular glue 22 can be applied in the overlapping area 52, so that the two edge areas of the wound layer lying one on top of the other are glued.
• a next layer 14 of cardboard composite material is simultaneously, but locally very slightly offset, as shown in FIG. 5, wound around the mandrel 23 and the already existing layer 11, which was connected here according to the version according to FIG. 4, and wound through with it bonded.
• the edge areas of the second layer 14 are preferably sanded in steps so that they can be positively connected to one another by overlapping and this overlap is glued to form a central seam 17.
• FIG. 5 also shows that a third layer 12 made of cardboard composite material , i.e. the outer layer, can also be wrapped around the then middle layer 14 at a slightly different time and place and their form-fitting overlap can also be glued to form the outer seam 16.
• the outermost layer can be coated with an outer material, for Example with a layer with very fine holes, so that water vapor can escape from the can body, while conversely no water vapor is allowed to penetrate 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 dotted) made of PE, PP, PET with/without adhesion promoter or adhesive, and this sealing strip is applied with or without the supply of heat, depending on its characteristics. Instead of sticking a strip 46 onto the resulting endless tube 27 moving on the mandrel 23, the seam 16 of the outermost layer can be sealed by means of hot and therefore liquid PE.
• the webs 11, 14, 12 are coated on one of their flat sides with an adhesive, preferably glue.
• the "endless" material webs of the individual layers 11, 14, 12, i.e. initially those for forming the innermost layer 11, are fed through and pulled along a stationary, cylindrical steel mandrel 23 in a machine station the same wrapped around the steel dome 23.
• the web of material runs between the steel dome 23 and a plurality of clinging rollers (not shown), each with a U-shaped cross section.
• the two edges of the barrier layer overlap, as shown in FIG.
• the innermost layer 11, which is wound into a tube is conveyed further over another section of the steel mandrel 23.
• the middle ply 14 is applied to the innermost wrap or ply 11 locally just behind the innermost ply 11 on the same machine.
• the longitudinal edges of this middle layer 14, which are preferably cut into a step 21 or inclined surface 44, are made to overlap by wrapping the mandrel 23 and glued by means of the glue that has already been applied.
• the outer layer is also applied to the previously wound layer 14 at the same time and locally slightly set back.
• a cutting device 26 for example a clocked reciprocating guillotine, as shown in FIG. 5, which cuts the tube at desired points 27 cuts into pipe sections 28.
• the cutting can be done not only with a preferably mobile guillotine, but also with a known multi-round knife machine.
• a carriage with a plurality of circular cutters travels with the endless pipe 27 at the production speed and can thus cut a plurality of pipe sections 28 in one operation.
• the pipe sections 28 preferably pass through a heat tunnel in order to remove the glue moisture.
• the heat can be generated in different ways. Warm air is preferred.
• the can body 2 is inserted into a hollow cylinder 48 which has rounded inner edges 51 .
• This curved inner edge 51 is traced with a steel roller 49 which rotates about the axis 50, the axis 50 being moved in such a way that it describes a cone wall.
• the steel roller 49 rolls the upper edge region of the can body 2 in one or more turns onto the curved inner edge 51 and spreads the layers slightly apart.
• a projection is created, as shown in the following Fig. 7.
• the cut edges are preferably sealed after this carding or spreading by painting with a dispersion adhesive, for example a liquid polyethylene PE or a dispersion adhesive or another suitable, quick-setting and food-safe adhesive so that no moisture can penetrate the interior of the kraft paper layer, because subsequent filling is inevitably carried out in a humid atmosphere.
• a dispersion adhesive for example a liquid polyethylene PE or a dispersion adhesive or another suitable, quick-setting and food-safe adhesive so that no moisture can penetrate the interior of the kraft paper layer, because subsequent filling is inevitably carried out in a humid atmosphere.
• the cut edges are then again treated with heat to minimize the setting time.
• infrared radiation is preferred at this point.
• these tube sections 28 are arranged in an upright position in a row in a transport device and then, as shown in FIG. a base element 4, is inserted into the open-topped side of each pipe section 28 and flanges the outer edge area of the radially tapering base edge in the radial direction around the edge area of the
• FIG. 7 illustrates this process of tightly flanging in a closure element in the form of a bottom 4 or cover element 5 .
• the base and lid elements can be a standard base or lid that is used to seal conventional aluminum cans and can then be assembled using the same machines.
• the base 4 or cover element 5 consists of aluminum and has a radially protruding edge area 41, ie an area which protrudes beyond the diameter of the can body 2.
• the bottom 4 or lid element 5 with the edge area 41 is brought to overlap with the edge area 42 of the can body 2 by an automatic machine.
• the flanging is then carried out by the machine 32, which for this purpose cuts the protruding double-layered sections 41, 42, i.e.
• the edge area 41 flanged together with the edge region 42 of the can body ie rolled in by about 360° or more, resulting in a tight flanged seam.
• the cut edge of the can body 2 has a seal 37 made of moisture-proof material.
• the lid element 5 or base element 4 usually has a compound material 38 which is an elastic sealing material which is applied in the area of the protruding edge area 41 which faces the edge area 42 of the can body 2 .
• the compound material 38 preferably extends from the inside of the curl 39 (extreme downward curvature of the edge) of the lid element 5 or base element 4 to the shoulder 40 of the lid element 5 or base element 4, with the compound material 38 at least partially overlapping the height of the shoulder 40 and at least partially over the inner radius of the curl 39.
• the compound material 38 preferably extends at least over half the height of the shoulder 40.
• FIG. 8 shows an alternative base or cover 4, which is shown here in a diametrical section.
• a silicone-based sealing ring 47 is inserted into the downwardly open channel formed by it.
• the lid is then installed as with a conventional aluminum can, using the same machines.
• the silicone sealing ring ensures an additional flawless seal and the overlapping areas are rolled inwards together.
• FIG. 10 shows a rotary indexing machine 32 with a carousel 30 which mounts the base elements on the can body and crimps or beads their edges with the can body edge, as described above.
• the pipe sections 28 which are open on one side are then collapsed in the conveying channel so that their now open side is at the top, as shown in FIG. 11 .
• a filling device 33 in particular a carousel filling station, which fills each pipe section 28 with a defined filling quantity.
• a filled and closed can 1 is then presented as shown in Fig. 9, where it is shown in a section along its longitudinal axis. You can see the can body 2 and the flanges 43 above and below, with which the lid 5 and the bottom 4 were used to form a seal.
• the can jacket 101 has a barrier layer 102, a first middle layer 103, preferably at least a second middle layer 104, an outer paper or kraft paper layer 105 and an outer barrier layer 106.
• the barrier layer 102 has an overlapping seam running in the longitudinal direction of the can jacket 101, with two layers of the barrier layer 102 coming to lie on top of one another at the overlapping seam.
• the first embodiment variant illustrated in FIGS. 13-15 has only a barrier film or a barrier laminate 108 composed of a plurality of film layers as the barrier layer 102 .
• the barrier layer 102 is moisture-resistant and impermeable on both sides and at its cut edges. A simple overlap of the barrier layer 102 is sufficient to create a tight longitudinal seam.
• the embodiment variant of FIG. 13 is shown in detail in FIGS. 14 and 15, the barrier layer 102 being shown as a barrier laminate 108 here. It is advantageous that no dissimilar material has to be glued together when producing the longitudinal seam, since dissimilar bonding, for example of paper material and plastic, usually requires more special adhesives and/or more time and leads to weaker bonds than the bonding of paper to paper or plastic on plastic.
• the barrier laminate is welded to itself in the overlapping area.
• the welding can also be carried out in all variants of the present invention by the direct action of heat on the plastic, for example by hot air.
• the length of the overlap of the longitudinal seam in the circumferential direction of the can jacket 101 is preferably between 1 and 6 mm, particularly preferably between 2 and 4 mm, in particular 3 mm.
• the embodiment variants of FIGS. 16-31 provide for the barrier layer 102 to be designed as a composite of kraft paper layer 107 and a barrier film or as a composite of kraft paper layer 107 and barrier laminate 108 made from several film layers. As a result, the barrier layer 102 can be wound more easily and is more stable.
• the length of the overlap of the longitudinal seam in the circumferential direction of the can jacket 101 is preferably between 1 and 6 mm, particularly preferably between 2 and 4 mm, in particular 3 mm.
• the innermost layer of the can jacket 101 can be formed by the barrier laminate 108, which is preferably laminated to a layer 107 of kraft paper.
• the connection of the barrier laminate 108 and the kraft paper layer 107 is preferably carried out before the cylindrical can jacket 101 is wound up the winding process of the cylindrical can jacket 101 is provided.
• FIGS. 16-18 A second variant embodiment is illustrated in FIGS. 16-18.
• the barrier layer 102 in the exemplary embodiment in FIGS. 16-18 has an overlap with itself, with two layers of the barrier layer 102 coming to rest on top of one another.
• a sealing strip 110 is attached, which protrudes beyond the cut edge on both sides and is glued or welded to the two inner films of the barrier laminate 108.
• the sealing strip 110 is thus on the very inside, viewed from the inside out, followed by a layer of the barrier laminate 108, followed by a kraft paper layer 107, these being firmly connected to one another even before the winding.
• a further layer of the barrier laminate 108 adjoins the kraft paper layer 107, these being preferably bonded to one another during the winding process.
• the further layer of the barrier laminate 108 is followed by a further kraft paper layer 107, these being firmly connected to one another even before the winding.
• FIGS. 19-21 A third embodiment variant is illustrated in FIGS. 19-21.
• the barrier layer 102 is wound without overlapping, so that the two edges of the barrier layer running in the longitudinal direction of the can jacket 101 meet in a butt joint.
• a sealing strip 110 is attached in order to seal the longitudinal seam present as an abutting edge. Less preferably, the abutting edge can be sealed or made liquid-tight by applying a liquid seal, for example a hotmelt.
• FIGS. 22-24 A fourth variant embodiment is illustrated in FIGS. 22-24.
• the barrier laminate 108 or a barrier film protrudes beyond the kraft paper layer 107, so that the cut edge of the kraft paper layer 107 is covered or sealed by the barrier laminate 108 or a barrier film.
• both the kraft paper layer 107 and the barrier laminate 108 of a first edge area overlap the kraft paper layer 107 and the barrier laminate 108 of the second edge area, with the barrier laminate 108 of the first edge area overlapping the second edge area further than the kraft paper layer 107.
• FIGS. 25-27 A fifth embodiment variant is illustrated in FIGS. 25-27.
• the barrier laminate 108 or a barrier film protrudes beyond the kraft paper layer 107, so that the cut edge of the kraft paper layer 107 is covered or sealed by the barrier laminate 108 or a barrier film.
• the barrier laminate 108 of a first edge area overlaps the kraft paper layer 107 and the barrier laminate 108 of the second edge area.
• the kraft paper layer 107 of the first region is in abutment with the kraft paper layer 107 of the second marginal region, although as illustrated there may be a small gap between the edges of the kraft paper layers.
• FIG. 1 A sixth embodiment variant is illustrated in FIG.
• the barrier laminate 108 or a barrier film projects beyond the kraft paper layer 107 at a first edge area and at the second edge area the kraft paper layer 107 protrudes the barrier laminate 108.
• the barrier laminate 108 of the first area rests on the inside of the exposed kraft paper layer 107 of the second area.
• the two edges of the barrier laminate 108 may meet in an abutting manner, in which case a sealing strip 110 covers the abutting edge.
• the barrier laminate 108 of the first edge area overlaps the barrier laminate 108 of the second edge area, with no sealing strip 110 being required in this case.
• the barrier laminate 108 or a barrier film projects beyond the kraft paper layer 107 at a first edge area and at the second edge area the kraft paper layer 107 protrudes the barrier laminate 108.
• the kraft paper layer 107 of the first edge area rests on the inside of the exposed kraft paper layer 107 of the second edge area.
• the kraft paper layer 107 of the first edge area can be in abutment with the barrier laminate 108 of the second edge area or have a gap thereto.
• the barrier laminate 108 of the first edge region overlaps and is glued or welded to the barrier laminate 108 of the second edge region.
• the two superimposed kraft paper layers 107 of the first edge area and the second edge area can be glued, in particular glued.
• the outer layer of the barrier layer 102 is formed by the kraft paper layer 107 over the entire circumference in all embodiment variants of FIGS.
• the kraft paper layer 107 is preferably untreated on the outside, ie not painted or laminated, so that the outside is formed by kraft paper material.
• the inner middle layer 103 is placed around the outside of the barrier layer 102 during the winding process, with this being untreated on the inside and on the outside, ie not coated or laminated.
• the inside of the inner middle layer 103 is glued over the entire surface to the outside of the barrier layer 102, kraft paper material preferably being glued directly to kraft paper material, so that Glue can penetrate the fiber matrix of both layers, resulting in a particularly high final strength of the adhesive bond.
• adhesives such as hotmelt adhesives or two-component adhesives can also be used less preferably, the lower final strength of the hotmelts and the difficult processability of the two-component adhesives being significant disadvantages compared to glue or water-based adhesives.
• Aqueous solutions of adhesives are understood here as glues.
• known paper glues can be used.
• a combination of two or more different adhesives can also be used, which could be used together to bond two layers together, or to bond different layers in each case.
• hot melt and water-based adhesive can be applied side by side to a ply to bond two plies together.
• Solvent-based adhesives and glue in particular, can be applied in the liquid state or as a foam.
• Foam has the advantage that it can cover the surface to be bonded or glued compared to a non-foam adhesive or glue with less liquid content.
• the inner middle ply 103 is wrapped around the barrier laminate 108 or barrier film.
• the inner middle layer 103 has a coating of plastic or a laminated film on its inside.
• the coated or laminated side of the inner middle layer 103 can be glued or welded to the barrier laminate 108 or the barrier film.
• At least one further middle layer 104 is preferably placed around the outside of the inner middle layer 103 during the winding process, with this preferably being untreated on the inside, ie not coated or laminated.
• middle layers 103, 104 are more complex and associated with higher material costs than using only one thicker layer for the can jacket, but it is advantageous that the two thinner layers, in particular kraft paper layers, are processed more quickly on the winding machine and that, surprisingly, the stability of the can body could even be increased compared to using a thicker layer.
• middle plies 103, 104 and an additional paper or kraft paper ply 05 are used, as shown in Figs. 13-33, with the inner middle ply 103 and each further middle ply 104 preferably being untreated or uncoated on both sides and the outer one being paper - or kraft paper layer 105 is preferably untreated or uncoated at least on the inside.
• a particularly preferred can jacket is manufactured with a height in the range from 130 mm to 150 mm and an outer diameter in the range from 50 mm to 60 mm and an inner diameter in the range from 48.6 mm to 58.6 mm.
• a particularly preferred closed can has the dimensions: external height 134 mm, internal height 133 mm, external diameter 52.4 mm, internal diameter 51.2 mm, internal volume approx. 270-275 ml, filling volume 250 ml.
• the can has a barrier layer 102 as the innermost layer, which is formed from foil material and kraft paper in the embodiment variants of FIGS. 16 to 34 and is formed only from foil material in the embodiment variant of FIGS. 13-15.
• the foil material is preferably a composite foil comprising an aluminum foil and at least one plastic foil, which together form the barrier laminate 108 .
• the barrier laminate 108 preferably has an aluminum foil, particularly preferably with a layer thickness of 6-9 gm, which is present between two plastic layers.
• the barrier laminate 108 preferably has the structure of plastic film, preferably made of PE, aluminum foil, adhesion promoter preferably in the form of Surlyn, plastic film preferably made of PE.
• the individual layers of the barrier laminate 108 are particularly preferably present in the following thicknesses: plastic film 10-25 gm, adhesion promoter 2-5 gm, aluminum foil 6.5-7.5 gm, plastic film 10-25 gm.
• the barrier laminate 108 preferably has a thickness of 30 gm to 55 gm.
• the barrier laminate 108 has a particularly preferred thickness of 35-50 gm, in particular 40-45 gm.
• the barrier laminate 108 preferably has a grammage of 45 to 75 g/m 2 , in particular 50 g/m 2 to 65 g/m 2 .
• the barrier layer 108 also includes at least one layer of barrier material containing silicon, in particular made of SiOx, which is present on or in the barrier laminate, or replaces one, several or all layers of the barrier laminate.
• the kraft paper layer 107 of the barrier layer 102 preferably has a thickness of 60 gm to 90 gm.
• the kraft paper layer 107 of the barrier layer 102 particularly preferably has a thickness of 70-85 gm.
• the kraft paper layer 107 of the barrier layer 102 preferably has a grammage of 40 g/m 2 to 80 g/m 2 , in particular 50-70 g/m 2 , in particular 60 g/m 2 .
• the barrier layer 102 has a preferred layer thickness of 90 gm to 145 gm.
• the barrier layer 102 has a particularly preferred layer thickness of 110-135 gm.
• the tear strength MD of the kraft paper of the kraft paper layer 107 is preferably at least 4 kN/m, in particular at least 5.0 kN/m.
• the tear strength CD of the kraft paper of the kraft paper layer 107 is preferably at least 2 kN/m, preferably at least 2.5 kN.
• this has the structure of a barrier laminate 108 with the layers from the inside to the outside: plastic layer in the form of a heat-sealing lacquer, preferably made of PET; aluminum layer in the form of aluminum foil; Plastic layer in the form of adhesive and kraft paper layer 107 made of kraft paper.
• the kraft paper of the kraft paper layer 107 preferably has a grammage of 40 g/m 2 .
• the heat-sealing lacquer preferably has a grammage of 1.6 g/m 2
• the aluminum foil has a layer thickness of 7.7 gm and a grammage of 20.8 g/m 2
• the plastic layer of adhesive has a grammage of 2 g/m 2 .
• this barrier layer 102 has a layer thickness of approximately 60 gm and a grammage of approximately 65 g/m 2 .
• the barrier sheet 102 is longitudinally wrapped around a mandrel to form a longitudinal seam to form a tubular body with the inner plastic film of the barrier laminate 108 facing the mandrel and the kraft paper layer 107 facing away from the mandrel.
• the next layer, ie the inner middle layer 103 is preferably a kraft paper layer and particularly preferably has a grammage of 125 g/m 2 , a tear strength MD of >12 kN/m and a thickness of 0.160 ⁇ m.
• the kraft paper is untreated on both sides.
• the inner kraft paper layer 103 preferably has a grammage of 95 g/m 2 to 135 g/m 2 and/or a tear strength of greater than 10 kN/m and/or a thickness of 0.140 mm to 0.175 mm.
• the kraft paper layer is glued, in particular glued, directly and over the entire surface to the kraft paper layer 107 of the barrier layer 102 by wrapping it around the tubular body of the barrier layer 102 .
• Glue preferably polyvinyl acetate, is used for gluing, preferably in an amount of 10-25 g/m 2 , in particular 15
• the next layer is the middle layer 104, for example made of kraft paper with a grammage of 125 g/m 2 , a tear strength of >12 kN/m and a thickness of 0.160 mm.
• the kraft paper is untreated on both sides.
• the middle layer 104 preferably has a grammage of 95 g/m 2 to 125 g/m 2 and/or a tear strength MD of more than 10 kN/m and/or a thickness of 0.140 mm to 0.175 mm.
• This further middle layer 104 is glued, in particular glued, directly and over its entire surface to the underlying inner middle layer 103 by winding it around the tubular body of the barrier layer 102 and inner middle layer 103 .
• Glue preferably polyvinyl acetate, is used for gluing, preferably in an amount of 10-25 g/m 2 , in particular 15
• the can body preferably has a fourth layer, which is formed from the outer paper or kraft paper layer 105.
• the outer paper or kraft paper layer 105 preferably has a grammage of 80-130 g/m 2 , in particular 100-120 g/m 2 .
• the outer paper or kraft paper layer 105 preferably has a thickness of 70-120 ⁇ m, in particular 90-110 ⁇ m.
• the outer paper or kraft paper layer 105 is applied in the winding system over the middle layer 104 and preferably with glue, preferably polyvinyl acetate, in an amount of preferably 10-25 g/m 2 , in particular 15-20 g/m 2 , with this over the entire surface glued.
• glue preferably polyvinyl acetate
• the can jacket 101 preferably comprises the barrier layer 102, the inner middle layer 103, the middle layer 104 and the outer paper or kraft paper layer 105.
• the thickness D of the can jacket is approximately 550 pm.
• the can jacket 101, consisting of the barrier layer 102, the inner The middle layer 103, the middle layer 104 and the outer paper or kraft paper layer 105 preferably has a total thickness of 500-650 ⁇ m, particularly preferably 550 to 620 ⁇ m.
• the can jacket 101, consisting of the barrier layer 102, the inner middle layer 103, the middle layer 104 and the outer paper or kraft paper layer 105 preferably has a tensile strength CD of greater than 300 N/15mm, in particular greater than 350 N/15mm, i.e.
• the can jacket 101 consisting of the barrier layer 102, the inner middle layer 103, the middle layer 104 and the outer paper or kraft paper layer 105 preferably has a grammage of at least 400 g/m 2 , in particular at least 450 g/m 2 .
• This outer kraft paper layer 105 is preferably provided with an outer barrier layer 106 on the side facing the outside of the can, for example a single-layer barrier film, with or without pinholes, preferably polyethylene (PE) with a grammage of 15 g/m 2 and/or a thickness of 15 gm or covered with a varnish.
• PE polyethylene
• the outer layer can only consist of an outer barrier layer 106 in the form of a barrier film, with or without pinholes, preferably PE with 25 g/m 2 .
• the inner middle layer 103 and second layer 104 can be adjusted in terms of their material thickness in such a way that the overall material thickness of the can jacket is retained.
• the number of middle layers 104 may be greater than one, for example in the case of a can with a height of 245 mm and a diameter of 175 mm, a number of two middle layers is preferred.
• a total thickness D of 767 gm results, for example.
• the inner middle layer 103, the middle layer 104 and the outer kraft paper layer 105 with greater thickness, for example in a can with H: 245 mm and D:
• Increasing the number of layers is advantageous compared to increasing the thickness of the layers, since with thinner layers a higher process speed and greater stability of the can body can be achieved in relation to the overall grammage of the kraft paper used.
• the tensile strength index MD as the quotient of tensile strength MD and grammage of the kraft paper used for the kraft paper layer 107 and the layers 103, 104, 105 is preferably in the range of 70-120 Nm/g.
• the tensile strength index CD as the quotient of tensile strength CD and grammage of the kraft paper used for the kraft paper layer 107 and the layers 103, 104, 105 is preferably in the range of 35-70 Nm/g.
• the tensile strength index MD of the kraft papers used is preferably greater than 80 Nm/g.
• the tensile strength index MD is particularly preferably greater than 100 Nm/g.
• the tensile strength index CD of the kraft papers used is particularly preferably greater than 40 Nm/g.
• the tensile strength index CD is particularly preferably greater than 50 Nm/g.
• the layer structure preferably includes at least two further plies 103, 104 made of kraft paper with the indicated tensile strength indices MD and CD.
• the kraft paper layer 107 or at least one of the other layers 103, 104 can also be formed from another cardboard or paper material which has the specified tensile strength indices MD and CD.
• kraft paper is distinguished by higher tensile strength indices MD and in particular CD (cross direction).
• the kraft paper of the kraft paper layer 107 and the kraft paper of the plies 103, 104 is unbleached.
• the paper or kraft paper of the outer paper or kraft paper layer 105 can be bleached, which can be advantageous for printing designs on the outside thereof.
• the outer paper or kraft paper layer 105 can already be printed with a product design before it is wound, and this printing can advantageously be present between the paper or kraft paper layer 105 and the outer barrier layer 106 .
• the cutting in the cutting device 26 is then registered with regard to the printing.
• FIG. 32 shows a cross section through a particularly preferred construction of the can jacket 101 according to the invention.
• the inner middle layer 103 and the other middle layer 104 have obliquely shaped lateral edges, so that the two at the respective web material opposite edges of the layers mutually overlap, but without, or without a significant, increase in the layer thickness of the layer in the overlapping area.
• other shapes of the edges are also suitable, such as stepped edges or interlocking edges, as illustrated in FIG. 33 .
• at least one of the two edges of at least one of the layers 103, 104, 105 is preferably provided with a shape that leads to a reduction in the thickness of the overlapping area of the two edges.
• both edges of at least one of the layers 103, 104, 105 are provided with a shape so that the thickness of the edges lying on top of one another is equal to the thickness of the layer itself.
• the innermost middle layer 103 is particularly preferably provided with such a structure.
• At least one existing middle layer 104 is preferably provided with such a structure, particularly preferably all existing middle layers 104.
• the edges of the outer kraft paper ply 105 preferably meet butt, with the gap in the butt area being sealed by applying a strip 109 (also referred to as a stripe) of PE, PET or PP film, or a sealing material is applied by means of a spray head after the can body has been formed.
• a strip 109 also referred to as a stripe
• the edges of the outer kraft paper layer 105 that meet are advantageous because the resulting gap is more regular and therefore visually more appealing and there is no edge area of the outer kraft paper layer 105 with a reduced layer thickness, which would be less stable to external mechanical influences.
• edges of the inner middle layer 103 and/or the edges of the further middle layers 104 can also impact themselves, it being assumed that this could have a negative effect on the stability of the layer structure.
• the barrier layer 102 is first fed as a web material in the longitudinal direction of a mandrel of a winding machine and moved further in the longitudinal direction of the mandrel.
• the two edges are formed around the dome so that these edges meet on the other side of the dome and the dome is now enclosed by the web material.
• the two edges of the web material of the barrier layer 102 come to lie one on top of the other on the dome.
• the barrier layer 102 is preferably not provided with glue on its outside.
• the winding machine is therefore particularly preferably provided according to the invention as an improvement to the known prior art with an application device, for example with a nozzle, which applies adhesive (e.g. glue or hotmelt) in a targeted manner to at least one of the two adjacent areas of the barrier layer 102 in the area of the longitudinal seam .
• adhesive e.g. glue or hotmelt
• the inner, middle layer 103 is placed around the barrier layer 102, in that this is also fed as web material, preferably in the longitudinal direction of the mandrel of the winding machine, and is moved further in the longitudinal direction of the mandrel.
• the two edges of the inner middle layer 103 are formed around the barrier layer 102 on the dome so that those edges meet on the other side of the dome and those on the dome located barrier layer 102 is now enclosed by the web material of the inner middle layer 103.
• the edges of the inner middle layer 103 preferably overlap one another so that they are glued to one another.
• the inner middle layer 103 is provided with glue on the inside, for example by applying it when the web material is fed in, with the glue being distributed over the entire surface between the layers when the inner middle layer 103 is molded or pressed onto the kraft paper layer 107 of the barrier layer 102.
• each middle ply 104 are placed one after the other around the inner middle layer 103 by feeding this as web material preferably in the longitudinal direction of the mandrel of the winding machine and moving it further in the longitudinal direction of the mandrel.
• the two edges of each middle ply 104 are formed around the inner middle ply 103 already on the dome so that those edges meet on the other side of the dome and the inner middle ply 103 on the dome is now enclosed by the web material.
• the edges of each middle layer 104 preferably overlap one another so that they are glued together.
• Each middle layer 104 is provided with glue on the inside, for example by applying it when the web material is fed in, with the glue being distributed over the entire surface between the layers when the middle layer 104 is molded or pressed onto the inner layer 103 already on the mandrel.
• the outer paper or kraft paper layer 105 is formed around the outer layer 103, 104 already on the mandrel, in that this is also fed as web material, preferably in the longitudinal direction of the mandrel, to the winding machine and moved further in the longitudinal direction of the mandrel.
• the two edges of the outer kraft paper ply 105 are formed around the outer pre-dome ply 103, 104 such that these edges meet on the other side of the dome and the pre-dome ply 103, 104 is now enclosed by the web material.
• the edges of the outer kraft paper ply 105 preferably do not overlap each other so that they meet in abutment.
• the outer kraft paper layer 105 is provided with glue on the inside, for example by applying it when the web material is fed in, with the glue being distributed over the entire surface between the layers when the outer kraft paper layer 105 is molded or pressed onto the layer 103, 104 underneath.
• the outer kraft paper layer 105 can preferably already have an outer barrier layer 106, i.e. be supplied as a laminate or web material coated on one side, so that it has a liquid-resistant or liquid-repellent outside.
• the outer kraft paper ply i.e. be supplied as a laminate or web material coated on one side, so that it has a liquid-resistant or liquid-repellent outside.
• the outer kraft paper ply i.e. be supplied as a laminate or web material coated on one side, so that it has a liquid-resistant or liquid-repellent outside.
• 105 must be provided with waterproof or moisture-proof printing.
• the outer kraft paper layer 105 does not yet have a liquid-resistant or liquid-repellent outer side when it is fed in, it can be provided with one in the winding machine or after the winding machine.
• a liquid-resistant or liquid-repellent film or laminate can be applied around the outer kraft paper layer 105 with the winding machine.
• the formed hollow cylinder can be sprayed or printed with a liquid-resistant or liquid-repellent substance, in particular a paint.
• this film or laminate can be welded plastic side to plastic side to enclose the outer kraft paper ply 105 tightly.
• a simple overlap will suffice.
• a folding seam can also be provided for this.
• 106 can also be in the form of a printed or label layer that is sealed at least on the outside over the outer Kraft paper layer 105 are attached, which is then sealed, for example, with a glued-on strip 109 in the joint area of its two edges.
• the joint area of the outer layer is preferably sealed on the winding machine, for example by applying liquid-resistant or liquid-repellent material as a liquid, or in the form of a strip 109 , In particular adhesive strips, is attached.
• the outer seam of the outer paper or kraft paper layer 105 or another layer arranged above it can thus be designed as a folded seam, as a simple overlap or butt to butt (butt seam).
• the butt seam can be sealed with hotmelt, a strip or tape or a sealing liquid, these means preferably being applied on the winding machine after the outermost layer has been wound and before the individual hollow cylinders are cut.
• the stripe or the tape can be self-adhesive or be present as a plastic strip, in particular a PE strip, which is fixed by ultrasonic welding.
• Hotmelt is preferably applied in the winding machine with a nozzle to the paper tube which is located on the mandrel and is moved past the nozzle.
• the nozzle is preferably directed perpendicularly onto the gap of a butt seam, running in the longitudinal direction of the paper tube, of the outermost layer applied in the winding machine.
• the nozzle can have a cylindrical or rectangular cross-section and have a straight or flat opening surface.
• the nozzle opening surface is preferably concave as seen in the circumferential direction of the paper tube, ie it is adapted to the cylindrical shape of the tube, the opening surface of the nozzle preferably being at a uniform distance from the tube.
• the hotmelt is preferably applied directly to the winding machine after the outermost layer has been wound, with the outermost layer already being or having a dense outer barrier layer 106 .
• the hot melt 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 seam.
• the outer layer is preferably formed from an absorbent material, in particular paper or kraft paper, which is provided on its outside with a moisture-resistant material, for example laminated with a moisture-resistant film or coated with a moisture-resistant substance.
• the gap of the butt seam preferably has a width in the range of 0.5-4mm inclusive.
• the hotmelt is preferably applied in the form of a strip projecting beyond the gap in the butt seam, the width of the hotmelt strip being preferably at least 1 mm, in particular at least 2 mm wider than the width of the gap in the butt seam.
• the width of the gap of the butt seam is 3 mm and the width of the hot melt strip is 6 mm.
• the hotmelt is applied in the heated state, for example at 160°-190° C., and hardens by cooling until the individual cylinders are cut by the mandrel 23 of the winding machine. This can preferably be supported with a cooling device, for example in the form of a fan.
• the sealing of the butt seam with an adhesive results in a very flat and homogeneous outer circumference of the can.
• the film formed by the adhesive or the hotmelt on the outer barrier layer 106 is only 0.05 to 0.1 mm, for example.
• the outer kraft paper layer 105 which has the barrier layer 106
• another paper or cardboard material can also be used, preferably one made from or containing recycled paper or fiber material.
• the outer kraft paper layer 105 is provided with an outer barrier layer 106 in the form of a film, the kraft paper layer 105 and the film being a Laminate are present and are thus fed together as a material balm of the winding device.
• the film layer is longer in the transverse direction of the material web than the kraft paper layer 105, so that the edge of the film layer that protrudes on one side comes to rest on the other edge of the film layer that does not protrude.
• the protruding edge of the film layer can be melted or welded onto the underlying film layer that does not overlap the kraft paper, or an adhesive can be applied to the underside of the overlapping area, in particular an activatable, in particular heat-activatable adhesive, for gluing the film layer to itself.
• the individual hollow cylinders are then bent open at both ends in the edge area.
• the bending up preferably takes place in a length range of 5 mm, with the outer edge being bent outwards by 2.5 mm. From the outer edge, the bent-up area transitions into the non-bent-up jacket area, preferably along a circular path with a radius of preferably 3-4 mm, in particular 3.3-3.5 mm.
• edges that have been cut off or already bent up are preferably provided with a sealing liquid so that their ability to absorb moisture is reduced. This preferably takes place in that this sealing liquid is applied during bending.
• the cut edges can be sealed by applying tape or shrink tubing.
• the bent and end-sealed hollow cylinders are then transferred to a can closing machine, in which first one end, preferably the lower end, of the hollow cylinder is closed with a first closing element, for example a base element 4 first.
• the base element 4 is preferably an aluminum base element of a conventional aluminum can, which has at least approximately the same volume or the same diameter as the can in question.
• the medium in particular a carbonated drink
• the hollow cylinder which is closed at the bottom, preferably in an amount of 0.25 liters.
• the filled hollow cylinder is subsequently closed at the top with a second closure element, for example with a cover element 5 .
• the lid is preferably an aluminum lid of a conventional aluminum can, which has at least approximately the same volume or the same diameter as the can in question.
• Closing and filling preferably takes place on a clocked system with a throughput of 80,000 cans/hour.
• 40,000 can bodies per hour are produced on the winding system, which means a speed of around 1.5 m/s for the finished tube in the direction of the winding mandrel.
• the desired processing capacity of 80,000 cans/h can be achieved by mirroring the machine, with the flanged can bodies from both machine units being brought together in front of the seamer for the can bottom.
• the can jackets 2 in question which come from the slower winding system, can preferably be closed together with conventional aluminum can jackets on the same faster closing and filling system and particularly preferably with the same base elements and the same lids and without any changeover effort or time interruption. This means that the speed of winding system is no longer process-critical and the filling system can be operated independently of this with full process performance.
• the composite cans according to the invention and conventional aluminum cans can be filled and closed in batches or alternately on the same system, so that the lower production speed of a single winding system is compensated for by the production of conventional aluminum cans.
• the system can then produce 40,000 inventive cans/hour and 40,000 aluminum cans/hour, so that advantageously two product lines, i.e. environmentally friendly composite cans and proven aluminum cans, can be produced simultaneously and continuously on one system.
• the need for composite jacketed cans according to the invention can be exactly covered and the remaining capacity can be used for standard cans, which is particularly advantageous for product launches, since the sale of composite jacketed cans according to the invention would initially not lead to full utilization of a conventional filling plant.
• the simultaneous or sequential use of the filling system according to the invention for cans according to the invention and conventional aluminum cans is thus additionally lowered a further inhibition threshold for the product changeover, since aluminum cans can still be produced and can only gradually be replaced by composite jacketed cans to an increasing extent.
• Beverage cans with a height of 134 mm and an outer diameter of 52.4 mm and with a filling volume of 250 ml of a carbonated beverage were produced with the preferred layer structure according to one of FIGS. 16-33.
• the beverage cans were sealed top and bottom with standard aluminum can ends and ends using standard sealing equipment.
• the layers used and the resulting layer structure are specified in the table below.
• the tensile strength MD (machine direction) indicates the tensile strength of the kraft paper in the longitudinal direction of the can jacket 101
• the tensile strength CD (cross direction) indicates the tensile strength of the kraft paper in the circumferential direction of the can jacket 101. It can be seen that the conventional paper of the paper layer 105 used has a significantly lower tensile strength, particularly in the transverse direction (CD).
• the grammage of the entire layer structure of the can jacket 101 is increased compared to the sum of the individual layers due to the glue application of 18 g/m 2 per glue layer.
• the glue application amounts to a total of 54 g/m 2 due to the three full-surface glue layers.
• the cans thus produced were suitable for storing and transporting the carbonated beverage.
• the particularly preferred layer structure of the can according to the invention therefore has an inner barrier layer 102 made of a barrier laminate 108 and a kraft paper layer 107 with a single overlapping longitudinal seam running in the longitudinal direction of the can, two layers 103, 104 each wound on top of this, each with an overlapping seam running in the longitudinal direction of the can.
• the layers 103, 104 have a reduced thickness in the seam area at least at one edge, above which is a wound layer of paper or cardboard material, which has an outer barrier layer 106 on the outside and a butt seam running in the longitudinal direction of the can and forming a gap, which is sealed with hotmelt, the layers 103, 104 being glued, in particular glued, with their kraft paper surfaces directly to one another and to the layers above and below.
• the advantages of the cans according to the invention are the recyclability and the good ecological balance. Since the can is similar to plastic-coated cardboard packaging in terms of the materials used, the aluminum parts, the paper layers and the plastic foils can be separated from one another and sorted for recycling using known dissolving processes. In particular, the high proportion of renewable parts, especially in the form of paper, makes the can advantageous over cans made of aluminum and/or plastic. The ecological balance of the present can is better than that of conventional aluminum cans.
• the cylindrical can jacket 101 of the can consists mainly of paper or cardboard material and comprises at least two wound layers and is closed at the bottom with a bottom element 4 and at the top with a lid element 5, with the can 1 withstanding an internal pressure of at least 5 bar
• the innermost layer of the can jacket 101 consists of a straightly wound barrier layer which has a longitudinal seam with itself running in the longitudinal direction of the can 1, the barrier layer being a laminate of an inner diffusion-tight film or an inner diffusion-tight barrier laminate 108, a central paper or preferably kraft paper layer 107 and an outer plastic layer 111, with at least one further wound layer of paper or cardboard material with an inner plastic layer 111 being present around the barrier layer of the can jacket 101, with the plastic layers 111 of the barrier layer 102 and the
• the further wound layer of paper or cardboard material with an inner plastic layer 111 can also have an outer plastic layer 111 .
• only one plastic layer 111 can be present between the further layers 103, 104, 105 of paper or cardboard material, for example by having it already present on one of the two adjacent layers before winding.
• the layered structure thus comprises the barrier layer, the paper material of which is bonded, in particular glued, to the paper material of the following layer of paper or cardboard material, with between this following layer of paper or cardboard material and the outermost layer of paper or cardboard material of the can jacket between two of these layers there is at least one plastic layer 111.
• the at least one plastic layer 111 is advantageously used to connect the two layers by being heated. The fact that at least two layers are joined by heated or melting plastic reduces the amount of liquid introduced into the layer structure by adhesive or glue.
• the direct bonding or gluing of two paper materials of at least two consecutive layers of paper or cardboard material creates improved stability of the can, with the barrier layer preferably being one of these layers, so that the barrier layer and the subsequent layer are connected particularly rigidly.
• At least one plastic layer 111 is preferred, which is provided with perforations or openings between two layers of paper or cardboard material, so that moisture can be distributed through the plastic layer 111 between the layers of paper or cardboard material.
• the moisture brought in by gluing or gluing can advantageously be distributed between the layers of paper or cardboard material, so that the overall moisture content of the individual layers can be reduced.
• the material of the plastic layer is preferably a polyolefin, in particular PE.
• the embodiment variants of FIGS. 34 and 35 are advantageous regardless of how the barrier layer 102 and the outer barrier layer of the can are implemented.
• the barrier layer 108 of the barrier sheet may be in the form of a film, laminate, composite film, or coating, or a combination thereof.
• the further wound layers of paper or cardboard material with their plastic layers 111 can in turn have a longitudinal seam, preferably with a reduced thickness in the overlapping area with itself.
• the outermost layer can again have a butt seam, with suitable sealing of the gap.
• the paper or cardboard material of one or more or all layers of the can according to the invention or its variants can preferably be kraft paper or paper or cardboard material with comparable tensile strength indices MD (machine direction) and CD (transverse direction).
• 36 to 41 show further embodiment variants which are characterized in that the inner edge of the further layer 103 following the barrier layer butts against an edge of the barrier layer 102 and the outer edge of the further layer 103 overlaps the inner edge of the further one Location 103 is located.
• the barrier layer 102 and the further layer 103 each have an overlap with themselves, these being wound straight and therefore having edges running straight in the longitudinal direction of the endless tube formed on the mandrel.
• each additional middle layer made of paper or cardboard material, in particular kraft paper layer, is preferably also made.
• the inner edge of the outer paper or kraft ply 105 abuts the outer edge of the underlying ply 104 and the outer edge of the outer paper or kraft ply 105 overlaps the inner edge of the outer paper or kraft ply Kraft paper sheet 105 is located.
• the outer paper or kraft paper layer 105 has an outer barrier layer 106, as already described for the other embodiment variants, or is provided with one.
• the further layers 103 and 104 are preferably present with the same material thickness.
• the other layers 103 and 104 can have a reduced material thickness in the overlapping area with themselves on one or both of the two overlapping edge areas.
• the edge of the barrier sheet 102 may be formed by having a simple overlap with itself.
• the further layer 103 and the barrier layer 102 can also be present with different material thicknesses.
• the edge of the barrier sheet 102 may be formed by having a fold seam to itself.
• the further layer 103 is present with the same strength as the double barrier layer 102 .
• the further layer 103 can also be present with a different material thickness.
• the first edge of a second further ply 104 may abut the outer edge of the first further ply 103, with the second edge of the second further ply 104 not up to the first edge of the second further layer 104 protrudes. It is preferred that the second edge of the second additional layer 104 protrudes to the beginning of the area of the inner additional layer 103 in which the increased thickness of the layer structure is present, which results from the overlapping of the barrier layer 102 with itself. As can be seen in FIGS. 39 and 40, the second further layer 104 conceals the increase in thickness in the area of the overlaps of the barrier layer 102 and the layer 103 present on this.
• the outer edge of the inner further layer 103 can be designed with a reduced thickness, in particular with an inclined surface.
• the edge of the additional layer 104 lying on the outside can be designed with a reduced thickness, in particular with an inclined surface.
• the edges, in particular inclined surfaces, of the two layers 103, 104 overlapping.
• the second edge of the second further layer 104 can additionally or alternatively be designed with a reduced thickness, in particular with an inclined surface.
• the further layer 104 can overlap itself, in which case the beveled surface of the outer edge can be used for the attachment of an externally adjoining layer which also has a beveled surface.
• the additional layer 104 can be used to conceal the increase in thickness, with the inclined surface being present in that area in which the thickness of the composite of the barrier layer 102 and the inner layer 103 changes.
• the longitudinal seam can be sealed by a sealing strip 110, as shown.
• the longitudinal seam can also be sealed by a film layer of the barrier layer 102, which simply overlaps the barrier layer 102 in the region of the longitudinal seam, as shown in FIGS. 15, 24,
• the sealing is effected by the fold seam itself, since no cut edge of the paper or kraft paper layer 107 of the barrier layer 102 is exposed to the inside.
• the folded seam is characterized in that the two edge areas of the barrier layer 102 rest against one another with their diffusion-tight barrier laminate 108 or their diffusion-tight film or coating and are folded over onto the two edge areas on the barrier layer 102 itself.
• FIGS. 43 and 44 schematically illustrate variants in which the increase in thickness of the seam of the barrier layer 102 is at least largely concealed by the additional layer structure.
• the seam is designed as a self-sealing fold seam, but this can also be designed according to one of the variants of the seam of the barrier layer 102 described for the other figures.
• the seam of the barrier layer 102 is accommodated in a gap in the paper, cardboard or, in particular, kraft paper layer 103 adjoining the barrier layer 102 .
• the two longitudinal edges of the layer 103 are thus at a distance from one another and lie on both sides of the increased thickness of the barrier layer
• the subsequent further paper or cardboard layer in particular kraft paper layer 104, preferably runs around the entire circumference of the can jacket.
• the two longitudinal edges of sheet 104 may abut one another, or may overlap one another, wherein the overlapping edge portions of sheet 104 may be of reduced thickness, as illustrated in FIG. Contrary to what is shown, it is preferred that the abutting or overlapping area of the layer 104 is arranged offset to the seam of the barrier layer 102 and thus offset to the gap of the layer 103
• the seam of the barrier layer 102 and the layer 103 adjoining the barrier layer 102 are accommodated in a gap of the subsequent further paper or cardboard layer, in particular kraft paper layer 104.
• the two longitudinal edges of layer 104 are thus at a distance from one another and are present on both sides of the increased thickness of barrier layer 102 and layer 103 in the area of the seam.
• the layer 103 runs around the entire circumference of the can jacket. The two long edges of the ply
• FIG. 44 has proven to be advantageous compared to the variant of FIG. 43, since in the variant of FIG Seam of the barrier layer 102 is larger.
• the barrier layer 102 can be designed according to one of the embodiment variants described herein, in particular it can have a simple overlap or a folded seam with itself in the seam area.
• the respective overlaps of the layers 102, 103 and 104 are preferably arranged offset to one another, so that there is no summation of the thickness difference.
• the overlap of the layers 103 and/or 104 can be minimal, for example in the range from 1 to 10 mm, in particular 1 to 5 mm.
• the inner or the outer edge of at least one of the respective layers 103, 104 faces an area of the layer structure in which the thickness of the layer structure changes.
• at least one of the plies 103, 104 may have the inner longitudinal edge in front of the caliper of the underlying ply and placed over the caliper with the outer longitudinal edge of the ply lying in front of the rising flank of the caliper.
• At least one of the plies 103, 104 may lie with the inner longitudinal edge down the descending flank of the caliper of the underlying ply and with the other end passed over the caliper so that the outer longitudinal edge of the ply meets the inner longitudinal edge of the position overlapped.
• FIG. 46 shows an embodiment variant in which the two further layers 103, 104 overlap themselves.
• the overlapping edge regions of the respective layer 103, 104 can be present with a non-reduced thickness.
• the layers 103 and 104 thus have an increase in thickness in the form of a simple overlap.
• the barrier layer 102 can be designed according to one of the embodiment variants described herein, in particular it can have a simple overlap or a folded seam with itself in the seam area.
• the respective overlaps of the layers 102, 103 and 104 are arranged offset to one another, so that there is no summation of the thickness difference.
• Both layers 103, 104 lie with the inner longitudinal edge towards the descending flank of the increase in thickness of the layer below and are guided with the other end over the increase in thickness, so that the outer longitudinal edge of the respective layer 103, 104 overlaps the inner longitudinal edge of the respective layer 103, 104 overlapped.
• the inner longitudinal edges of the layers 103, 104 can face that flank of the thick increase which is not formed by a longitudinal edge of the underlying layer.
• the inner longitudinal edges of the layers 103, 104 can face that flank of the increase in thickness, which is formed by a longitudinal edge of the underlying layer.
• FIG. 47 shows a particularly preferred variant in which the two further layers 103, 104 overlap themselves.
• the overlapping edge areas of the respective layer 103, 104 can be reduced thickness.
• the layers 103 and 104 thus have an increase in thickness in the form of a simple overlap.
• the barrier layer 102 can be designed according to one of the embodiment variants described herein, in particular it can have a simple overlap or a folded seam with itself in the seam area.
• the respective overlaps of the layers 102, 103 and 104 are arranged offset to one another, so that there is no summation of the thickness difference.
• Both layers 103, 104 each lie with the inner longitudinal edge towards the descending flank of the thickness increase of the underlying layer and are guided with the other end over the thickness increase, so that the outer longitudinal edge of each corrugated layer 103, 104 is the inner longitudinal edge of each corrugated layer 103 , 104 overlapped.
• the inner longitudinal edges of the layers 103, 104 can face the same flank of the thick increase. As shown in the example, the inner longitudinal edges of the layers 103 and 104 can each be to the left of the increase in thickness. As illustrated in the example, the outer longitudinal edges of the layers 103 and 104 are also in each case on the same side of the increase in thickness, namely on that side on which the inner longitudinal edges of the layers 103, 104 are also present.
• FIG. 47 Other plies are preferably arranged in the same manner as illustrated in FIG. 47 for the outer paper or kraft ply 105.
• FIG. The ply 105 has its inner longitudinal edge facing the outer longitudinal edge of the ply 104 which forms the rising flank of the thickness increase.
• 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.
• middle layers 103, 104 made of paper or kraft paper between the barrier layer 102 and the outer barrier layer 106, in particular three to four middle layers 103, 104.
• this layer of the can jacket in the form of a wound layer of paper or cardboard material faces a flank of the increase in thickness resulting from the longitudinal seam of the barrier layer.
• the inner longitudinal edge of at least one of the further layers 103, 104 and optionally the layer 105 of the can jacket 101 of a flank of the through the longitudinal seam faces the resulting increase in thickness and the outer longitudinal edge of the respective layer 103, 104, 105 overlaps the inner longitudinal edge of the same layer 103, 104, 105.
• the overlapping area of the two longitudinal areas of the respective layers is twice the material thickness of the layer and the overlapping areas are offset from one another in the circumferential direction. As illustrated in FIG.
• the overlapping areas are preferably arranged adjoining one another, with the first overlapping area of the innermost of these layers adjoining a flank of the increase in thickness of the barrier layer 102 and the others Connect the overlapping areas of the other layers to the outer longitudinal edge of the layers underneath.
• the respective middle layer 103, 104 and optionally layer 105 is preferably glued to itself, in particular glued.
• a sealing material encloses the inner longitudinal edge of the barrier layer 102 or the inner longitudinal edge of the paper, in particular kraft paper layer 107, so that sealing material is present on both sides on the inner edge area of the inner paper, in particular kraft paper layer 107.
• the web material of the barrier layer 102 is preferably already present in this way before the winding or when it is fed to the winding device. Alternatively, it is possible to wrap the sealing material around the edge of the web material during feeding to the mandrel of the winder.
• FIG. 48 illustrates that the barrier laminate 108 or a barrier film of the barrier layer 102 can be designed to enclose the inner longitudinal edge of the paper layer 107, in particular kraft paper layer.
• the outer edge area of the barrier layer 102 comes to lie over the folded-back edge area of the barrier laminate 108 or the barrier film, which protrudes beyond the longitudinal edge of the paper layer 107, in particular kraft paper layer.
• a sealing strip 110 can be present, which encloses the inner longitudinal edge of the barrier layer 102 and thus also the inner longitudinal edge of the paper layer 107, in particular kraft paper layer 107, in a U-shape.
• the outer edge area of the barrier layer 102 comes to lie over the folded-back edge area of the sealing strip 110 that protrudes beyond the longitudinal edge of the paper layer 107, in particular kraft paper layer.
• a coating with a dense material could also be applied in a U-shape around the inner longitudinal edge of the barrier layer 102 in the same way.
• the coating can be applied in liquid or gaseous form or as a plasma before or during the feeding of the material web of the barrier layer 102 to the mandrel of the winding machine.
• the sealing strip 110 or the coating covers the edge area of the barrier laminate 108 or the barrier film on the inside of the can jacket.
• a coating with dense material is applied to the wound endless tube or preferably to the individual can jackets already cut from the endless tube applied to form the seam of the barrier layer. Similar to the sealing strip 110, the coating can be applied as a band-shaped application so that it protrudes only over the area of the inner longitudinal edge of the barrier laminate 108. Optionally, the coating can also be applied to the cut edges of the can jacket and/or as a band-shaped application over the seam of the outermost layer of the can jacket.
• the coating is applied to the entire inside of the can jacket.
• the coating can also be applied to the cut edges of the can jacket and/or its entire outside.
• An additional coating of the can jacket cut from the endless tube of the winding machine can be carried out in all of the embodiment variants described herein.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Making Paper Articles (AREA)
• Storage Of Web-Like Or Filamentary Materials (AREA)
• Wrappers (AREA)
• Packages (AREA)
• Rigid Containers With Two Or More Constituent Elements (AREA)
• Laminated Bodies (AREA)
• Materials For Medical Uses (AREA)

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