WO2002040192A1 - Stabilite a long terme d'une substance de remplissage contenue dans une boite-boisson en deux parties - Google Patents

Stabilite a long terme d'une substance de remplissage contenue dans une boite-boisson en deux parties Download PDF

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Publication number
WO2002040192A1
WO2002040192A1 PCT/DE2001/004295 DE0104295W WO0240192A1 WO 2002040192 A1 WO2002040192 A1 WO 2002040192A1 DE 0104295 W DE0104295 W DE 0104295W WO 0240192 A1 WO0240192 A1 WO 0240192A1
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WO
WIPO (PCT)
Prior art keywords
section
fold
coating layer
minimum thickness
fluid
Prior art date
Application number
PCT/DE2001/004295
Other languages
German (de)
English (en)
Inventor
Reinhard Kutschan
Sabine Koeppe
Werner Noll
Jens Krause
Original Assignee
Ball Packaging Europe Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ball Packaging Europe Gmbh filed Critical Ball Packaging Europe Gmbh
Priority to AU2002215855A priority Critical patent/AU2002215855A1/en
Priority to EP01996439A priority patent/EP1333945B1/fr
Priority to DE10194904T priority patent/DE10194904D2/de
Priority to DE50108708T priority patent/DE50108708D1/de
Publication of WO2002040192A1 publication Critical patent/WO2002040192A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
    • B21D51/30—Folding the circumferential seam
    • B21D51/32—Folding the circumferential seam by rolling

Definitions

  • the invention relates to metal hulls of two-part cans and their manufacture and their compatibility with long-term filling goods without these filling goods suffering from a deterioration in their quality (their taste).
  • the invention relates specifically to two-part metal cans consisting of a metal body and a lid, the metal bodies today mostly being produced by the ironing process and then being given their shape and geometry suitable for forming folds on the upper edge.
  • a hollow metal body made of aluminum sheet can usually realize a very compact fold. Examples of a compact fold are explained in the description of the figures.
  • a metal body made of sheet steel tends to have an inherently stronger spring effect, so that here training to a looser (not so compact) fold must be feared.
  • the storage time is added and during this time, under the effect of the internal pressure, a compact fold also forms into a poorer (less compact) fold. This makes it easier for the filling goods to access the folding area and increases the risk of metal being released.
  • a compact fold is understood to mean the spatial proximity, in particular the close contact of two sections in the vicinity of the actual fold, namely the upper fuselage wall and the vertically oriented top wall, mostly called "chuck wall". A stronger spacing of these two walls ensures easier access of the filling material to the sealing area of the fold.
  • the invention has set itself the technical task of further improving the long-term stability of goods in two-part cans (especially beverage cans).
  • a coating layer, in particular made of lacquer, is proposed for this purpose, which is more strongly emphasized in the fold area than was previously realized in the prior art (claims 1, 25, 27 and claims 20, 30).
  • the fold area was mostly excluded from a varnish application or neglected in terms of the thickness of the varnish application after an "overspray" had to be expected at the upper end of the fuselage when the varnish was sprayed onto the inner surface of the fuselage.
  • the easiest way to avoid the "overspray” is to move the center of gravity of the volume or weight portion of the sprayed paint into the lower part or at least not to emphasize the upper edge area of the metal hull or to spray it only parasitically.
  • a sufficiently thick coating of paint is formed in the body area (the wall area) and in the floor area for long-term stability of the contents, which represents the lower end of the wall area for the formation of the trunk.
  • the minimum thickness in the area of fold formation is achieved according to the invention by changing the balance of the volume or weight distribution of the lacquer.
  • a greater proportion of the weight or volume that is used for a given size and height of a beverage can (for example 0.3 I, 0.5 I or 0.2 I) is shifted towards the fold-forming section, from which mechanical deformation ( Fold) the fold is created between the lid edge and the end of the fuselage.
  • fold formation section is understood to mean the area above the body area of the metal body from which - at least partially - the fold of the beverage can is produced when the metal body is closed with an associated closure lid. Previously, the contents were filled, usually a drink, such as beer, soft drink or other liquids (claims 12, 13).
  • the coating can be applied by spraying (claim 16).
  • a separate spray nozzle can be used for the fold forming section.
  • a spray nozzle with a changed weight distribution in the spray jet can also be used, so that a higher proportion by weight reaches the upper edge of the metallic fuselage, for a stronger, clearer or improved coating in the upper region of the fuselage with regard to the uniformity of the surface which at least partially forms a mechanically clamping fold with an edge area of the cover used.
  • the lacquer layer in the fold-forming section which has a flange region and a substantially cylindrical region, then merging into a neck region, which is inclined radially outwards and merges into the cylindrical region in a gentle curvature, is (on average) with a thickness of at least 8 ⁇ m, in particular at least 10 ⁇ m and above.
  • the paint layer in the flange area of the fuselage can also have a thicker percentage than the paint layer in the body area.
  • This average reinforcement of the cover layer in the flange area is at least 30%, preferably 40% stronger than in the body area.
  • the neck molding processes can take place either as spin-necking or die-necking with stamping.
  • a lacquer coating can be provided on the inner wall of the fuselage before or after the necking process.
  • the first step is the non-molded state on the cylindrical fuselage. Then it is pulled in by stamping. A laterally projecting flange is formed in the fold-forming section. Another coat of varnish can then be applied. Two varnish pads are provided for beverage cans with soft drink content.
  • the first step is mechanical shaping in the upper neck section by means of a roller movement acting from the outside in order to form the cylindrical can in this area.
  • the flange that forms the fold is then formed.
  • the lacquer is applied after the flange formation.
  • Two varnish layers can be applied here one after the other after a mechanical molding.
  • the lacquer overlay in the fold formation area has a minimum width and a minimum height. It has an areal extension with regard to the minimum thickness, even if certain areas would have a hypothetically assumed lower local thickness due to cracks or breaks in the lacquer layer. Such conditions should not affect the claimed "flat minimum thickness" of the paint. The same is to be understood with regard to a minimum thickness that extends over an area.
  • the minimum thickness of the paint protects against roughness of the metallic surface against penetration by the paint or an excessive reduction in the paint thickness.
  • the minimum thickness can also protect against adhesion problems which would lead to tearing of the lacquer under mechanical stress - the formation of the fold by mechanical shaping - if the lacquer is provided in a too thin layer in the fold-forming section.
  • the minimum thickness of the lacquer also protects against the penetration of cracks through the entire lacquer layer and thus limits the number of places in the fold formation area where metallic substrates are - even if only on Line-shaped cracks appear.
  • the contents of the can have practically no access to a metallic base in the area of the fold formation, in particular in the flange area, which is subject to the greatest mechanical deformation during the formation of folds.
  • Such a coating is achieved with a spray arrangement as a machine arrangement, which is to be emphasized here separately, in which the inner wall of the fuselage (the inner wall and the flange area in the tipped state or the upper section of the beverage can body in a state not yet held) is covered.
  • the spray arrangement ensures that a larger proportion of the volume or weight of the lacquer reaches the fold formation area than was previously the case in the prior art.
  • the spray application can be reduced in its angle and emphasized on the fold-forming section, in particular the area of curvature which lies between the flange and the substantially cylindrical section of the fold-forming section.
  • a separate nozzle can be provided which, as a flat jet nozzle, carries out the coating in the fold-forming section in the case of a rotating metal body.
  • a flange ie also with a cylindrical section if the flange is formed afterwards.
  • the section at the top of the can which receives a thicker coating, can be coated several times, for example two or three times.
  • the process of additional painting can also be applied to possibly pre-painted metal surfaces. It is possible to carry out the additional painting in the area of the fold formation before or after painting the inner wall of the fuselage. It is preferred to paint after the entire surface has been painted. If there is no upstream paint layer, the entire interior painting of the can can be carried out in one process step, as described above by adjusting the weight distribution on spray heads or using an additional spray head.
  • lacquers can be used for the coating. This includes paints based on modified epoxy resins or combinations thereof. Tough-elastic paints are preferred (claims 19, 33). These varnishes have a polymer base, which has a partially crystalline structure in its main component. Lacquers with a proportion of PET are preferred. If such varnishes are used, the varnish layers can be up to 8 ⁇ m in the fold formation area in one flat section are reduced, while with conventional paints of a commercial nature the thickness in said section is preferably more than 40% stronger than the paint thickness on the inner wall and is above 10 ⁇ m, 12 ⁇ m or 15 ⁇ m, with a paint density on the inner wall of the body area of between 5 , 5 ⁇ to 6 ⁇ , up to below 10 ⁇ m.
  • a coating is carried out by a roller, a flexible roller on the surface, the can bodies move with their opening facing downward and a trained flange section past the roller, which causes an additional varnish application in the fold-forming section when it rotates, whereby the thickness ( Thickness) of this varnish is enlarged in this area.
  • rim coaters which usually use this technique to coat the bottom edge of the bottom at the closed end of a two-part box from the outside.
  • the rubber blanket roller as an example of an elastically flexible roller is coated with fluid by a transfer roller, which in turn engages in a bath of lacquer at least in sections.
  • the weights are 150 mg for cans with a volume of 150 ml for the first and second spraying, a weight of essentially 145 mg for a volume of 200 ml and for a volume of 250 ml with a weight of 165 mg, in each case for two successive sprayings Application processes by spraying with flat jet nozzles.
  • weights of greater height or size are used, for example 330 ml or 500 ml, weights of 160 mg or 240 mg per spraying process are used for two sprayings. These volumes can continue to be used if a greater proportion of the weight (or volume) is shifted to the area from which the fold is formed when closing. Examples illustrate and supplement the invention.
  • Figure 1 illustrates a finished fold in which an edge portion of a
  • Lid 2 and an upper end portion of the can body 1 have been mechanically deformed together to form a firm connection.
  • the lid and body are only shown in sections after the remaining part of the metallic container is known.
  • Figure 2 illustrates a fold formation before mechanical closing, with a flange 1a, a curvature area 1 k and an essentially cylindrical section 1 b, 1c on the can body and a lid hook 2b with a curved outer end section 2a. If a neck area is provided, this is indicated at 1d by radially molding an upper wall section which is essentially cylindrical.
  • the cover 2 is shown, which has a core wall above the inner one
  • Figure 3 illustrates a large enlargement of the flange 1a with curvature 1 k, and cylindrical section 1 b, which define the fold-forming section.
  • the flange as such has an outer one
  • Figure 4 illustrates in axial section a beverage can with a
  • Can body which is formed in one piece.
  • a body region 9 is provided, a circumferential rim 12 on which the can stands and an inner dome 11.
  • the essentially cylindrical wall which is shown here in a very shortened form, has a cylindrical wall 1w which leads to the neck region 8 , This neck area leads to the flange via a cylindrical section, the entire area above the neck 8 being referred to as the fold forming section 7.
  • a cylindrical wall section 19 which has not yet been formed, is shown, the upper one
  • Section 1 v is molded or changed later or remains unchanged.
  • Drawn in are nozzles 30, 31 which carry out a coating which will be explained in more detail later.
  • FIG. 4a is an enlarged detail of a wall piece 1 w with an inner coating 39 made of lacquer, the thickness of which can be seen.
  • FIG. 5 shows an example of a conveyor belt 59, on which a can body 1 is moved with its opening pointing downward in the longitudinal direction. It is coated by a roller 50, which applies lacquer from a bath 55. This varnish is applied in the flange region 1a to its essentially inward-facing wall.
  • the cans are with their dome-shaped bottom 11 either by magnetic force or vacuum on the
  • Figure 6 illustrates a large enlargement of a metal sheet, the surface of which is very roughened.
  • the roughening shows that the applied lacquer layer 40 appears considerably thinner in several places, but is still so thick in its total thickness d that it does not experience any obvious penetration of larger areas by the unevenness of the sheet metal surface.
  • a hypothetically drawn lacquer thickness 40 ' which is significantly smaller in the thickness dx, would be penetrated by uneven metallic spots that are exposed in the process.
  • the sheet thickness between 180 and 220 ⁇ m shown corresponds to the usual sheet thicknesses of stretched can bodies, whereby it should be noted that the paint thickness shown here has been greatly increased and the unevenness 1 * of the surface has been greatly enlarged to reflect the principle of paint penetration
  • FIG. 6b illustrates two fold geometries in the cut state, one with a very compact fold, in which the core wall and a cylindrical section of the fold-forming section of the fuselage lie closely together.
  • FIG. 6b illustrates a loose fold geometry in which the walls described are spaced apart from one another and accommodate a wedge-shaped space between them.
  • Figure 1 illustrates a cross section of a finished fold, in which an edge portion 2 * of a lid 2 and an upper end portion (above 1c) of the can body 1 are mechanically connected to one another, deforming a lid hook and a body hook from the illustration of Figure 2 for training of a finished fold according to FIG. 1.
  • cover 2 and the fuselage 1 are only shown in sections after the remaining part of the metallic container is known and is not to be explained in more detail here, but rather reference can be made to the state of the art.
  • this also includes the possibility of providing a circumferential groove, as shown in FIG. 2a, or of having the cover edge transferred into a cover mirror without such a groove.
  • the edge section 2 * of the cover with a cover hook 2b, 2a is located radially outside of this mirror design, possibly with a circumferential groove of radius r.
  • Above the still cylindrical section 1c on the fuselage which leads axially below it into a neck region 1d and above the cylindrical section 1c into a fuselage hook 1b, 1k and 1a (and 1e).
  • Curvature section 1 k lies between the two sections 1 a and 1 b, of which section 1 b is approximately cylindrical and section 1a runs approximately radially.
  • the radially outer end of the radially extending section 1e is 1e '.
  • the lid hook protrudes with its edge flange 2b and an inwardly curved end portion 2a over the fuselage hook 1b, 1k and 1a in order to form a fold with a forming roller, be it in a one-step or in a two-step fold-forming process.
  • a first roller with a first circumferential groove is used to achieve the first molding movement (the tilting).
  • the molded fold is pressed on with a second roller with a different geometry and shaped in the finished shape, as shown in FIG.
  • Figure 2 shows the preliminary stage to the shape of Figure 1, showing a slight difference in the transition to the fuselage.
  • a neck region 1d is provided in FIG. 2, while an essentially cylindrical transition to the torso is provided in FIG. 1 with 1d ′, that is to say no transition between the torso section (see reference number 9 in FIG. 4) and the fold region (as shown in FIGS. 1 and 2) has sloping section.
  • the embodiments of the invention are applicable to both hull shapes.
  • spin-necking can be used, as can die-necking, for the radial tapering of the essentially cylindrical edge section 9 (wall 1 w) of FIG. 4.
  • a Neck 8 provided at his axially upper end section opens into a section 7, which has the elements of a fold-forming section illustrated in FIGS. 1 and 2.
  • FIG. 4 illustrates in the right field a cylindrical wall 1v which has not been necked in, as corresponds to the illustration in FIG.
  • a necked-in (or neck area) 8 is shown above the cylindrical wall 1w between the fold-forming section 7 and the upper end of this wall, as it corresponds to that section 1d of FIG. 2.
  • 1v in the right field is the upper section of the cylindrical wall 19, as it corresponds to 1 d 'of Figure 1.
  • the cover 2 is also not shown in FIG. 4, but the edge region 2 * of the cover 2 (from FIG. 2) or the corresponding region in the section already provided with a fold above the point 1c of the wall (in FIG. 1) is easily imaginable.
  • the beverage can shown in FIG. 4 with a can body is made in one piece, i.e. only with a fold area at one end section, while at the other end of the body area 9 (left picture) and 19 (right picture) a bottom section 10 is formed in one piece, which consists of a circumferential rim 12, on which the can stands, and an inner dome 11 is formed.
  • This bottom geometry results from the stretching of a bowl to form the fuselage blank, which can then be necked in section 8.
  • the blank is made of thin sheet metal that is less than 250 ⁇ m thick.
  • the can has a given size, a height H1 and a diameter D1 being drawn in and defining the maximum size of the can with its edge dimensions.
  • a coating layer is applied to an inward-facing surface 6, 6a.
  • the inner surface of the fuselage section 9, 19 and the bottom section 10 is designated by 6.
  • a likewise essentially inwardly facing surface 6a in the fold-forming section 7 consists of the surface on the cylindrical section which corresponds to section 1b of FIG. 2 and a flange section which corresponds to section 1k, 1a of FIG.
  • the surfaces described are coated with a fluid, in particular a lacquer or another coating, which adheres to the inward-facing surface 6, 6a.
  • 4a explains how the coating layer 39 is applied to the inwardly facing surface 6, with a wall 1 w in the fuselage section 9.
  • the thickness of the layer 39 is dO.
  • a coating is also applied to the remaining surface 6a in the fold-forming section 7, which coating can be explained in more detail with reference to an enlarged section in FIG. 3.
  • this coating 40 is arranged as a flatly extending layer on the essentially inward-facing surface which lies above point 1c.
  • FIG. 3 illustrates an enlarged detail of the flange 1a with the curvature region 1 k and the cylindrical section 1 b, which define the fold-forming section, as identified in FIG. 4 by the reference number 7.
  • the flange as such has an outer end 1e 'which projects laterally upwards before the fold is closed, as shown in FIG.
  • a paint layer 40 is shown, which lies on the surface 6a. This coating has 40 different sections as a coating layer or coating layer.
  • the coating layer 40 continues the previously described coating layer 39, the coating layer 39 from FIG. 4a being applied by the spray nozzle 31 when the fuselage rotates.
  • a second spray nozzle 30 which is axially higher and has a different direction has a smaller spray angle ⁇ than that
  • Spray nozzle 31 the spray angle ⁇ of which is larger and is aligned with the wall area 9, 19 or the neck area 8 for the case of the inhaled can. Subsequently, the spray section continues, which reaches an occupancy 40 according to FIG. 3 with a flat jet nozzle of extension angle ⁇ in the spray jet.
  • the spray angle of the first spray nozzle 31 can also be supplemented by the angle ⁇ in FIG. 4, so that a larger area of the inwardly facing surface 6 is reached, and not just the wall section 9 with the neck section 8 for the inhaled can or the wall section of the fuselage 19 for the can not be inhaled, rather also the fuselage section 10 with the base ring 12 and the upwardly curved base 11.
  • the extension and orientation of the second spray nozzle 30, which is directed onto the flange area 7 or its inner area, is independent of this Surface 6a targets.
  • the distribution of the volume of the fluid to be applied is designed in such a way that the minimum thickness d0 of the coating layer 39 is achieved in the body section 9, 19 and in the bottom section 10, specifically via the spray nozzle 31.
  • the spray nozzle 30 receives such a volume proportion that for the total coating of the inner Surface of the can provided fluid that the upper edge portion, so the fold-forming portion 7 on the inner surface 6a receives a thicker coating than the body and bottom portion.
  • a technically predetermined minimum thickness of the coating should not be undercut in the body section, but usually a larger amount of fluid is applied in the prior art in order to achieve this minimum thickness at all points of the trunk.
  • a portion of the fluid used for this purpose, in particular lacquer, is fed to the nozzle 30 so that it can cover a surface section with a coating layer 40 in a narrow area above the neck section 8, which does not fall below the actually achieved minimum thickness of the coating layer 39 in the body section 9 or 19 lies.
  • the coating thickness 40 lies above the layer thickness 39.
  • the flat area according to FIG. 3 is composed of a transition section n, an essentially axial section m, a curved section k and an essentially radially outwardly projecting end section g.
  • the greater coating thickness has a section h from section g, with an unoccupied section remaining at the end of section g up to the outer edge of the fuselage sheet 1a, 1 k, 1 b, until the end 1e ", so that an overspray (i.e. spraying of the coating material from the nozzle 30 past the free end 1 e ') can be avoided.
  • the layer thickness of the coating 40 is greater than that
  • the layer thickness of the layer sections 42, 41 and 44 is particularly relevant because this is the area according to FIG. 2 and FIG. 1 in which the greatest curvature of the fuselage flange occurs when the fold is formed. This area is marked with an angle ⁇ 1 in FIG. 2, starting from a hypothetically assumed point u 1 (which can be traced in its determination on the basis of the illustration), with an assumed fold height H (in the non-formed state) and an assumed horizontal plane the low point of the circumferential groove 2a or approximately the height of the cover mirror for those covers which have no circumferential groove.
  • the angle ⁇ 1 is between 50 ° and 70 ° and extends to the coating sections 42, 41 and 44 of FIG. 3, which can be attributed to the surface of the flange sections 1b, 1k and 1a of the fuselage flank.
  • the thickness d of the coating 40 obtained here on the surface 6a is preferably above 10 ⁇ m to 15 ⁇ m, if it is assumed that the coating thickness dO in the fuselage area is between 5 ⁇ m and below 10 ⁇ m. In its absolute dimensions, this depends on whether single or double-coated cans are used. It can of it it can be assumed that double-coated cans receive about 5 ⁇ m applied per layer of paint. For both single and multi-coated cans, the thickness d in the areas h, k and m is greater than the thickness dO.
  • the thicker layer thickness 40 can also extend over section n, n corresponds in length to approximately m.
  • Coating layer of the same thickness d can be provided, but it can also be reduced because there are no particularly critical requirements for improving the fold.
  • the described distance of the end of the coating layer 45 with the extending length g (with a circumferentially oriented design) can ensure that no increased overspray is generated by the coating nozzle 30.
  • 1e * is the free edge of the end section 1e, starting from the flange section 1a.
  • the thicker coating continues in section 43 along the height n, as shown in FIG. 2 for section 1b.
  • the thicker coating layer 40 is thus arranged in the fold formation section 7, it can also extend beyond it, but the described area is sufficient for the function of the better fold formation and the avoidance of surface defects (roughness, adhesion problems or penetration of sheet metal surfaces).
  • the metal body is first mechanically deformed to form the neck region 8, the diameter of which is smaller than a diameter of the body section 9, the fluid for forming the layer 40 is then applied, which occurs during spin-necking.
  • the mechanical reshaping of the neck also includes shaping the fold-forming section with the flange described on the fuselage. After the mechanical shaping, several varnish layers can be applied one after the other. For example, two lacquer pads are provided for beverage cans with soft drink contents. If die-necking (forming with axially movable stamps) is achieved, neck formation can be assumed, for example, from the right field in FIG.
  • the fluid adhering to the inner surface is first applied before the mechanical shaping takes place in the stamp shaping, based on the upper section 1v of the body section 19, to form a neck, corresponding to the neck 8 of the left representation of FIG. 4.
  • a further lacquer application can then be provided, for example as shown in FIG. 4 with the spray nozzle 30.
  • the volume of the fluid for coating can be divided so that the first volume part produces the first layer thickness and the second volume part generates the second layer thickness, in order to sum up a total thickness dO as the technically required minimum thickness in the fuselage and a total thickness d in the fold area, which is greater in strength than that of the trunk.
  • the can body can then be filled and then closed with a lid to form a fold with at least a portion of the fold forming portion.
  • a lacquer which contains portions of PET can be used as the adhesive fluid, and the lacquer can also contain polybotyl terephthalate.
  • the drying process for curing the coating takes place at a temperature above 200 ° C. A shortening can be achieved if the temperature is increased to essentially 270 ° C.
  • the minimum thickness d of the fluid layer ensures that the roughness is covered, for example, in section 1a.
  • This section h of FIG. 1e is drawn out enlarged in FIG. 6, with a sheet thickness of between 180 ⁇ m to 220 ⁇ m in the flange area.
  • the lower layer of lacquer 40 'compensates for the roughness, while a remainder of the lacquer thickness ensures reliable compensation for even strong roughness 1 *.
  • the lacquer layer 40 is thinner in several places due to the roughness, but is still so thick in its total thickness d that it does not experience any obvious penetration of larger surface sections by the unevenness of the sheet metal surface.
  • a hypothetically assumed lacquer thickness d x corresponding to a layer 40 'as the lower section of the layer 40 shown, would not achieve that all the roughness is covered, rather some spots can still be recognized as penetrating through the lacquer layer. They are exposed to the surface and can have an influence on the quality and long-term stability of the fold in the case of a strong curvature in the area 1k, as described above.
  • FIG. 6 a shows a very compact fold in the cut state, in which the core wall and a cylindrical section of the fuselage, corresponding to section 1 b of one of FIGS. 1 to 3, lie closely together.
  • a fold geometry which is also possible is illustrated in FIG. 6b in such a way that it can be described as loose.
  • the described walls are clearly distant from the ideal shape, they are spaced far apart, and a wedge-shaped space is formed, which leads directly to the highly endangered curvature section 1 k.
  • the contents of the can easily penetrate this area and dissolve metal surfaces that may protrude from the paint layer. This can be avoided if the thicker coating layer as described above in
  • Folding section is provided, in particular in the radius of curvature and also radially inside and radially outside of it, in order to achieve long-term stability of the filling material without transfer of metal ions, regardless of a possibly not optimally designed folding geometry.
  • the dimensions shown in FIGS. 6a and 6b are in mm and can easily be referred to FIGS. 1 and 2 and the dimensions specified there and the variables specified there.
  • the rebate height fh is given as 2.55 mm (in FIG. 6a), which is reduced in the case of a more widely diverging rebate in accordance with FIG. 6b.
  • the thicker varnish layer 40 extending into the fold is not shown in FIGS. 6a, 6b, but has to be added mentally.
  • FIG. 5 An alternative covering or application of a layer on the inner wall takes place according to the example of FIG. 5.
  • a conveyor belt 59 is shown on which there is a can body 1 with its opening pointing downwards moved in the longitudinal direction. It is coated by a roller 50, which applies lacquer from a bath 55.
  • the varnish is applied in the flange region 1a and on its essentially inwardly facing surface 6a.
  • the lacquer thus reaches the fold-forming section 7 according to FIG. 4 to an increased extent, the can already being formed in a section provided with a flange, but still without necking.
  • An intermediate roller 51 can even out the application of the lacquer from the bath 55 to the transfer roller 50.
  • FIG. 5 can also be used for beverage cans that already have a necked-in section 8, as shown with reference to FIG. 4.
  • a geometry which is still provided without a flange (FIG. 4, right section) is not suitable for coating the fold section; here, for the application variant of FIG. 5, a deformation in the region 1v must first take place.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)

Abstract

L'objection de l'invention est d'améliorer la stabilité de substances de remplissage contenues dans des boîtes en deux parties. Il est proposé, à cet effet, de réaliser des corps de boîtes comportant au moins une couche de revêtement (40, 39) qui est appliquée sur au moins une surface (6) du corps (1) tournée sensiblement vers l'intérieur. Le corps comporte une partie corps (9, 19), une partie fond (10; 11, 12) et une partie bord supérieure (1v; 7), adaptée pour la formation d'un pli et servant donc de partie de formation de plis. Dans un processus d'application, le fluide formant la couche de revêtement (40, 39) est appliqué, de façon à y adhérer, sur la surface (6, 6a) tournée sensiblement vers l'intérieur, un volume prédéterminé de ce fluide étant utilisé. La répartition du volume sur la surface de la partie corps, de la partie fond et de la partie bord supérieure se fait de telle sorte que l'épaisseur minimale (d0) est maintenue sur la surface (6) de la partie corps et de la partie fond, et que la partie de formation de pli est atteinte par une proportion dudit volume du fluide adhérant telle que l'on obtient, dans ladite partie, le long d'une zone superficielle (1b, 1k), une épaisseur minimale (d) de la couche de revêtement (40; 41, 42, 43) qui n'est pas inférieure à l'épaisseur minimale de la couche de revêtement (39) obtenue effectivement dans la partie corps (9).
PCT/DE2001/004295 2000-11-17 2001-11-19 Stabilite a long terme d'une substance de remplissage contenue dans une boite-boisson en deux parties WO2002040192A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AU2002215855A AU2002215855A1 (en) 2000-11-17 2001-11-19 Long term stability of fillings in a two piece beverage container
EP01996439A EP1333945B1 (fr) 2000-11-17 2001-11-19 Stabilite a long terme d'une substance de remplissage contenue dans une boite-boisson en deux parties
DE10194904T DE10194904D2 (de) 2000-11-17 2001-11-19 Langzeitstabilität eines Füllguts in einer Zweiteiligen Getränkedose
DE50108708T DE50108708D1 (de) 2000-11-17 2001-11-19 Langzeitstabilität eines füllguts in einer zweiteiligen getränkedose

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10057142 2000-11-17
DE10057142.5 2000-11-17

Publications (1)

Publication Number Publication Date
WO2002040192A1 true WO2002040192A1 (fr) 2002-05-23

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PCT/DE2001/004295 WO2002040192A1 (fr) 2000-11-17 2001-11-19 Stabilite a long terme d'une substance de remplissage contenue dans une boite-boisson en deux parties

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Country Link
EP (1) EP1333945B1 (fr)
AU (1) AU2002215855A1 (fr)
DE (2) DE50108708D1 (fr)
WO (1) WO2002040192A1 (fr)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3986629A (en) * 1973-07-16 1976-10-19 The Southland Corporation Thermoplastic can end sealant composition
US4089283A (en) * 1976-06-21 1978-05-16 Rheem Manufacturing Company Metallic container and method for making the same
FR2499092A1 (fr) * 1981-02-02 1982-08-06 American Can Co Revetement pour metal, emboutissable et resistant au soufre
EP0108701A1 (fr) * 1982-11-08 1984-05-16 Georges Sireix Contenant à fond et/ou à couvercle sertis et son procédé de fabrication
CH669574A5 (en) * 1986-05-02 1989-03-31 Grabher Indosa Maschbau Ag Fibre can with metal ends - has sealing compound on turned- over lip and with profiled edge ends
DE4229923A1 (de) * 1992-09-08 1994-03-10 Basf Lacke & Farben Verfahren zur Herstellung von Verschlüssen von Verpackungsbehältern
FR2720305A1 (fr) * 1994-05-26 1995-12-01 Pierre Jacquemin Procédé de fabrication d'une boîte à couvercle métallique serti et boîte obtenue par ledit procédé.
WO1996017031A1 (fr) * 1994-11-29 1996-06-06 Schmalbach-Lubeca Ag Boite de boissons qui degage moins de fer
FR2739354A1 (fr) * 1995-10-02 1997-04-04 Pechiney Recherche Procede de fermeture de recipient avec un couvercle par sertissage et thermoscellage
US6129494A (en) * 1994-12-23 2000-10-10 Schmalbach-Lubeca Ag Compound dip process for metal cans

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3986629A (en) * 1973-07-16 1976-10-19 The Southland Corporation Thermoplastic can end sealant composition
US4089283A (en) * 1976-06-21 1978-05-16 Rheem Manufacturing Company Metallic container and method for making the same
FR2499092A1 (fr) * 1981-02-02 1982-08-06 American Can Co Revetement pour metal, emboutissable et resistant au soufre
EP0108701A1 (fr) * 1982-11-08 1984-05-16 Georges Sireix Contenant à fond et/ou à couvercle sertis et son procédé de fabrication
CH669574A5 (en) * 1986-05-02 1989-03-31 Grabher Indosa Maschbau Ag Fibre can with metal ends - has sealing compound on turned- over lip and with profiled edge ends
DE4229923A1 (de) * 1992-09-08 1994-03-10 Basf Lacke & Farben Verfahren zur Herstellung von Verschlüssen von Verpackungsbehältern
FR2720305A1 (fr) * 1994-05-26 1995-12-01 Pierre Jacquemin Procédé de fabrication d'une boîte à couvercle métallique serti et boîte obtenue par ledit procédé.
WO1996017031A1 (fr) * 1994-11-29 1996-06-06 Schmalbach-Lubeca Ag Boite de boissons qui degage moins de fer
US6129494A (en) * 1994-12-23 2000-10-10 Schmalbach-Lubeca Ag Compound dip process for metal cans
FR2739354A1 (fr) * 1995-10-02 1997-04-04 Pechiney Recherche Procede de fermeture de recipient avec un couvercle par sertissage et thermoscellage

Also Published As

Publication number Publication date
DE10194904D2 (de) 2003-11-06
EP1333945A1 (fr) 2003-08-13
AU2002215855A1 (en) 2002-05-27
EP1333945B1 (fr) 2006-01-11
DE50108708D1 (de) 2006-04-06

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