EP1333945B1 - 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
EP1333945B1
EP1333945B1 EP01996439A EP01996439A EP1333945B1 EP 1333945 B1 EP1333945 B1 EP 1333945B1 EP 01996439 A EP01996439 A EP 01996439A EP 01996439 A EP01996439 A EP 01996439A EP 1333945 B1 EP1333945 B1 EP 1333945B1
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EP
European Patent Office
Prior art keywords
section
fold
coating layer
process according
thickness
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
EP01996439A
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German (de)
English (en)
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EP1333945A1 (fr
Inventor
Reinhard Kutschan
Sabine Koeppe
Werner Noll
Jens Krause
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Ardagh Metal Beverage Germany GmbH
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Ball Packaging Europe GmbH
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Publication of EP1333945A1 publication Critical patent/EP1333945A1/fr
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    • 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 is concerned with metal hulls of two-piece cans and their preparation and their compatibility to take long-term contents, without these products suffer a deterioration of their quality (their taste).
  • the invention relates specifically to two-piece metal cans, consisting of a metal hull and a lid, wherein the metal body are usually produced today in the ironing process and then obtained their suitable for a seaming at the top of the form and geometry.
  • a hollow metal body made of aluminum sheet can usually realize a very compact fold. Examples of a compact fold are explained in the figure description.
  • a metal body made of sheet steel tends to an inherently stronger suspension effect, so that here a training to a looser (not so compact) fold must be feared.
  • the storage time is added and during this time forms under the effect of internal pressure and a compact fold to a worse (less compact) fold. The access for the filling material to the folding area is thus facilitated and increases the risk of metal delivery.
  • a compact fold is defined as 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 provides for easier access of the contents to the sealing area of the fold.
  • the invention has the technical problem of further improving the long-term stability of filled goods in two-part cans (in particular beverage cans).
  • a coating layer is proposed, in particular of lacquer, which is more pronounced in the fold region than has hitherto been realized in the prior art (claim 1, 24 or claim 30).
  • the fold area was in the prior art usually excluded from a paint overlay or neglected in terms of the thickness of the paint job after the top of the fuselage with an "overspray" had to be expected in a spray application of the paint on the inner surface of the fuselage.
  • the avoidance of the "overspray” can be most easily realized in that the center of gravity of the volume or weight portion of the sprayed paint is laid in the lower part or at least the upper edge region of the metal body is not emphasized or sprayed only parasitically with paint.
  • a paint deposit sufficiently strong for long-term stability of the filling material forms in the body area (the wall area) and in the floor area, which represents the lower end of the wall area for the formation of the fuselage.
  • the minimum thickness in the fold forming area is achieved according to the invention by a balance change of the volume or weight distribution of the paint.
  • a greater portion of the weight or volume used for a given size and height of a beverage can e.g., 0.3L, 0.5L, or 0.2L
  • the fold forming section from which mechanical forming (FIG. Folding), the fold between the edge of the lid and the end of the trunk is created.
  • the term of the fold forming portion is understood to mean that portion above the body portion of the metal body from which, at least in part, the fold of the beverage can is formed when the metal body is closed with an associated closure lid.
  • the contents were filled, usually a drink, such as beer, soft drink or other liquids (claim 12, 13).
  • the application of the coating can be done by spraying (claim 16).
  • a separate spray nozzle may be used for the seaming section.
  • a spray nozzle with a changed weight distribution in the spray jet can be used, so that a higher weight fraction reaches the upper edge of the metallic hull, for stronger, clearer or with respect to the uniformity of the surface improved coating in that upper region of the fuselage the at least partially a mechanically clamping fold is formed with an edge region of the lid used.
  • the varnish layer in the fold forming section which has a flange portion and a substantially cylindrical portion, then merges into a neck portion which is inclined radially outwardly and merges into the cylindrical portion in a gentle curvature, is (in the middle) with a thickness of at least 8 microns, in particular at least 10 microns and provided above.
  • the lacquer layer in the flange region of the fuselage can also have a percentage greater thickness than the lacquer layer in the body region. This intended in the middle reinforcement of the cover layer in the flange is at least 30%, preferably 40% stronger than in the body region.
  • the corresponding description also applies to this configuration of the end areas, where the one area is usually the ground-ridge area with a "rim” and an inward-arching "dome", as an expression of a two-piece beverage can, which has only on one side a lid to form a fold in the edge region.
  • the neck-molding operations can be done either as spin-necking or die-necking with stamping transformations.
  • a lacquer coating may be provided on the inner wall of the hull before or after the Einhalsvorgang.
  • Die-Necking first a first edition takes place in the non-molded state on the cylindrical hull. Subsequently, the retraction is carried out by stamp forming. The formation of a laterally projecting flange takes place in the fold forming section. Subsequently, a further coating layer can be applied.
  • Two lacquer overlays are provided for beverage cans with soft drink content.
  • the spin-necking takes place, it is first mechanically deformed by an externally acting roller movement in the upper neck section in order to mold the cylindrical can in this area. Subsequently, the flange is formed, which serves to form the fold. Following the formation of the flange, the paint is applied. Two varnish layers can be applied one after the other, after a mechanical indentation.
  • the paint deposit in the fold forming area has a minimum width and a minimum height. It has a surface extension in terms of minimum thickness, even if certain places would have a hypothetically lower local strength due to cracks or breaks in the paint layer. Such conditions should not affect the claimed "areal minimum thickness" of the paint. The same is to be understood with regard to a flatly extending minimum thickness.
  • the minimum thickness of the paint protects against roughness of the metallic substrate from penetration by the paint or excessive reduction of paint thickness.
  • the minimum thickness may also protect against adhesion problems which, if subjected to mechanical stress - the formation of the fold by mechanical deformation - would lead to cracking of the lacquer if the same is provided in too thin a layer in the fold forming section.
  • the minimum thickness of the paint also protects against the penetration of cracks through the entire paint layer and thus limits the number of places in the fold forming area, in which metallic substrates - even if only on line-shaped cracks come to light.
  • the can contents receives virtually no access to a metallic substrate in the fold forming area, especially in the flange, which is subject to the strongest mechanical deformation in the formation of folds.
  • Such a coating is achieved with a spray arrangement as a machine arrangement, which is to be emphasized separately here, in which the inner wall of the fuselage (the inner wall and the flange area in the uncovered state or the upper portion of the beverage can body in a not yet necked state) is occupied.
  • the spray arrangement ensures that a greater proportion of volume or weight of the paint enters the fold forming area, as was the case in the prior art.
  • the spray application can be reduced in its angle and be emphasized aligned to the seaming section, in particular the curvature region which lies between the flange and the substantially cylindrical portion of the seaming section.
  • a separate nozzle can be provided, which decodes the coating in the fold forming section as a flat jet nozzle in the case of a rotating metal body.
  • the same is possible with or without a flange, so even with a cylindrical section, if the flanging is done afterwards.
  • the section at the upper edge of the can which receives a stronger coating, can be coated several times, for example two or three times.
  • the method of additional painting can also be applied to possibly pre-painted metal surfaces. It is possible to perform the additional painting in the fold forming area before or after the painting of the inner wall of the fuselage. Preferably, after the overall painting of the inner surface is painted. If there is no upstream lacquer layer, then the entire interior lacquering of the can can can be carried out in one process step, as described above, by adjusting the weight distribution on spray heads or by means of an additional spray head.
  • tin inner paints can be used for the coating commercial tin inner paints. These include paints based on modified epoxy resins or combinations thereof. Toughened paints are preferred (claim 19, 33). These paints have a polymer base which has a semi-crystalline structure in its main component. Preference is given to lacquers with a proportion of PET (claim 14). If such varnishes are used, the varnish layers can be up to 8 ⁇ m in the fold forming area in one flat section are reduced, while in conventional paints commercially available nature, the thickness in the said section is preferably more than 40% stronger than the paint thickness on the inner wall and above 10 ⁇ m, 12 ⁇ m or 15 ⁇ m, with a paint density on the inner wall of the body region of between 5 , 5 ⁇ to 6 ⁇ , up to less than 10 ⁇ m.
  • a coating is made by a roller, a surface-compliant roller
  • the can bodies move with its opening facing downwards and a trained flange portion of the roller over which causes an additional coating application in the seaming section during its rotational movement, whereby the strength ( Thickness) of this paint is increased in this area.
  • Thickness the strength of this paint is increased in this area.
  • the blanket roll as an example of an elastically compliant roller is covered by a transfer roller with fluid, which in turn engages at least partially in a bath of paint.
  • the weights are for can bodies of the volume 150 ml for the first and second injection 125 mg, for a volume of 200 ml a weight of substantially 145 mg and for volume at 250 ml at a weight of 165 mg, each per injection at two consecutive Application processes by spraying with flat jet nozzles.
  • weights of 160 mg and 240 mg, respectively are used per spray at two sprays. These volumes may continue to be used when a greater portion of the weight (or volume) is displaced to the area from which the seam is formed upon closure.
  • Figure 1 illustrates a cross-section of a finished fold in which a rim portion 2 * of a lid 2 and an upper end portion (above 1c) of the can body 1 are mechanically connected together, deforming a lid hook and a trunk hook of Figure 2 for formation a finished fold of Figure 1.
  • the cover 2 and the hull 1 are shown only in sections, after the remaining part of the metallic container is known and will not be explained in detail, but on the state of the art insofar reference can be made.
  • the design of the cover profile also includes the possibility of providing a circumferential groove, as shown within FIG. 2a, or of letting the edge of the cover pass without such a groove into a cover mirror.
  • the lid hook projects with its edge flange 2b and its one inwardly curved end portion 2a on the fuselage hooks 1 b, 1 k and 1a over and over to form a fold with a forming roll, either in a single-stage or in a two-stage Falzformungs operation.
  • a first roller with the first circumferential groove is used to achieve the first forming movement (tilting).
  • a second roller with a different geometry of the molded fold is pressed and formed in the finished shape, as shown in Figure 1.
  • FIG. 2 thus shows the precursor to the figure of Figure 1, with a slight difference in the transition to the hull is shown.
  • a substantially cylindrical transition to the fuselage is provided in FIG. 1, ie, between the fuselage section (cf., reference numeral 9 in FIG. 4) and rebate section (as shown in FIGS has sloping section.
  • the embodiments of the invention are applicable to both hull shapes.
  • a spin necking can be applied, as well as a die necking, for radial tapering of the substantially cylindrical edge portion 9 (wall 1w) of Figure 4.
  • a Neck 8 provided at his axially upper end portion opens into a section 7, which has the elements of a seaming section illustrated in FIGS. 1 and 2.
  • FIG. 4 The axial section of Figure 4 illustrates in the right half of a non-necked cylindrical wall 1v, as it corresponds to the illustration of Figure 1.
  • a necked (or neck) region 8 is shown, which corresponds to that section 1d of FIG. 1v in the right field is the upper portion of the cylindrical wall 19 as it corresponds to 1d 'of FIG.
  • the cover 2 is also not shown in FIG. 4, but the edge region 2 * of the cover 2 (of FIG. 2) or the corresponding region in the section already provided with fold above the point 1c of the wall (in FIG. 1) is easily imaginable.
  • the beverage can with a can body shown in Figure 4 is integrally formed, ie only with a rebate at one end portion, while at the other end of the body portion 9 (left image) and 19 (right image), a bottom portion 10 is integrally formed, consisting of a circumferential rim 12, on which the can stands, and an inner dome 11 is formed.
  • This bottom geometry results when stretching a cup to form the fuselage blank, which can then be necked in section 8.
  • the blank is made of thin sheet metal, which has a thickness of less than 250 ⁇ m.
  • the can has a given size, with a height H1 and a diameter D1 drawn in and defining the maximum size of the can with its perimeter dimensions.
  • a coating layer is applied on an inwardly facing surface 6,6a .
  • the inner surface of the body portion 9, 19 and the bottom portion 10 is designated 6.
  • a likewise substantially inwardly facing surface 6a in the fold forming portion 7 consists of the surface on the cylindrical portion which corresponds to that portion 1b of Figure 2, and a flange portion corresponding to the portion 1k, 1a of Figure 2.
  • the described surfaces are covered with a fluid, in particular a lacquer or other coating, which adheres to the inwardly facing surface 6, 6a.
  • FIG. 3 illustrates an enlarged detail of the flange 1a with a curved region 1k and of the cylindrical section 1b, which define the seaming section, as indicated by the reference numeral 7 in FIG.
  • the flange has an outer end 1e 'that projects laterally upwardly before the seam is closed, as shown in FIG.
  • This lacquer coating has 40 different sections as a coating layer or coating layer.
  • the coating layer 40 continues the previously described coating layer 39, wherein the coating layer 39 of Figure 4a is applied by the spray nozzle 31 upon rotation of the body.
  • An axially higher and with a different direction provided second spray nozzle 30 has a lower spray angle ⁇ than the spray nozzle 31, the spray angle ⁇ is greater and is aligned with the wall portion 9,19 and the neck portion 8 in the case of the necked-in box. Subsequently, the spraying section continues, which reaches an occupancy 40 according to FIG. 3 with a flat jet nozzle of the extension angle ⁇ in the spray jet.
  • the spray angle of the first spray nozzle 31 can also be supplemented by the angle ⁇ , so that a larger area of the inwardly facing surface 6 is achieved, not just the wall portion 9 with the necked-in throat portion 8 or the wall portion of the hull 19 for the non-necked-in box, but also the body portion 10 with the base ring 12 and the upwardly curved bottom 11.
  • the extension and orientation of the second spray nozzle 30, which is independent on the flange 7 and its inner Surface 6a targets.
  • the distribution of the volume of the fluid to be applied is designed so that the minimum thickness d0 of the coating layer 39 is achieved in the body portion 9,19 and the bottom portion 10, via the spray nozzle 31.
  • the spray nozzle 30 receives such a volume fraction of the total for the 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 stronger coating than the body and bottom portion.
  • a technically predetermined minimum thickness of the coating should not be exceeded in the body section, but usually in the prior art, a larger amount of fluid is applied to achieve at least this minimum thickness at all points of the fuselage.
  • a portion of the fluid, in particular lacquer, used for this purpose is supplied to the nozzle 30 so that it can cover a surface portion with a coating layer 40 in a narrow area above the neck portion 8 which is not below the actual minimum thickness of the coating layer 39 in the body portion 9 or 9 19 lies.
  • the coating thickness 40 is above the layer thickness 39.
  • the areal area according to FIG. 3 is composed of a transition section n, a substantially axial section m, a curvature section k and an end section g projecting essentially radially outwards.
  • the greater coating thickness has a portion h of the portion g, wherein at the end of the portion g to the outer edge of the hull bead 1a, 1k, 1b, an unoccupied portion remains until the end 1e ', so that an overspray (ie a Vorbeisprühen the coating material of nozzle 30 at the free end 1e 'over) can be avoided.
  • the layer thickness of the coating 40 is greater than the layer thickness d0.
  • the layer thickness of the layer sections 42, 41 and 44 is particularly relevant because this is the region according to FIG.
  • the angle ⁇ 1 is between 50 ° and 70 ° and extends to the coating sections 42, 41 and 44 of FIG. 3, which are due to the surface of the flange sections 1 b, 1 k and 1 a of the fuselage flange.
  • the thickness d of the coating 40 obtained here on the surface 6a is preferably above 10 ⁇ m up to 15 ⁇ m, assuming that the coating thickness d0 in the trunk region lies between 5 ⁇ m and below 10 ⁇ m. This depends in its absolute dimensions on whether single or double coated cans are used. It can do that be assumed that twice coated cans per coating layer about 5 .mu.m applied. However, in the case of single as well as multiply coated cans, the thickness d in the regions h, k and m is greater than the thickness d0.
  • n corresponds in length to about m.
  • a coating layer of equal thickness d can be provided, but it can also be reduced because no particularly critical requirements for improving the fold result here.
  • the described distance of the end of the coating layer 45 with the extending length g ensure that no increased overspray is generated by the coating nozzle 30.
  • 1e * is the free edge of the end portion 1e, attaching to the flange portion 1a.
  • the thicker coating continues in the section 43 along the height n, as shown in FIG. 2 for the section 1b.
  • the thicker coating layer 40 is arranged in the fold forming section 7, it can also extend beyond, for the function of better folding and the prevention of surface defects (roughness, Stephensprobten or penetration of metal surfaces) but the described range is sufficient.
  • the application process shown in Figure 4 may be replaced by alternative application procedures which will be described below.
  • the application of the described coating layer 40 and the shaping of the neck and the formation of the flange is placed in time.
  • the metal body is first mechanically deformed to form the neck portion 8 whose diameter is smaller than a diameter of the body portion 9, the fluid for forming the ply 40 is subsequently applied, which occurs in spin necking.
  • the mechanical deformation of the neck also includes a molding of the fold forming section with the described flange on the fuselage. It can be applied successively after the mechanical forming several paint runs.
  • die necking forming with axially movable punches
  • necking e.g. starting from the right half of Figure 4.
  • the fluid adhering to the inner surface is applied before the mechanical forming in the stamp forming is done with respect to the upper portion 1v of the body portion 19 to form a neck corresponding to the neck 8 of the left-hand side of Fig. 4.
  • the flange is formed.
  • a further lacquer coating can be provided, for example, as shown with reference to Figure 4 with the spray nozzle 30.
  • the volume of the fluid for coating can be divided so that the first volume part generates the first layer thickness and the second volume part the second layer thickness, to sum up a total thickness d0 as a technically required minimum thickness in the fuselage and a total thickness d reach in the fold area, which is greater in strength than that of the trunk.
  • the can body After coating, a drying process is carried out to stabilize the surface. Subsequently, the can body can be filled and then closed with a lid to form a fold with at least a portion of the Falz Struktursabiteses.
  • the adhesive fluid used may be a lacquer containing proportions of PET, and the lacquer may contain polybotyl terephthalate.
  • the drying process for curing the coating takes place at a temperature above 200 ° C. Shortening can be achieved when the temperature is increased to substantially 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 Figure 1e is drawn out enlarged in Figure 6, with a plate thickness of between 180 ⁇ m to 220 ⁇ m in the flange.
  • the lower lacquer layer 40 'compensates for the roughness, while a remainder of the lacquer thickness ensures a reliable compensation even of high roughness 1 *.
  • the lacquer layer 40 is thinner at several points by the roughness, it is still so strong in its total thickness d that it experiences no obvious penetration of larger surface sections due to the unevenness of the sheet metal surface.
  • a hypothetical paint thickness d x corresponding to a layer 40 'as a lower portion of the layer 40 shown would not achieve that all roughnesses are covered, but some places are still recognizable as penetrating through the paint layer. They are exposed to the surface and can influence the quality and long-term stability of the fold with a strong curvature in the region 1k, as described above.
  • Figure 6a shows a very compact fold in the cut state, in which the Kemwand and a cylindrical portion of the hull, according to section 1b of one of the figures 1 to 3 are close to each other.
  • An equally possible seam geometry is illustrated in Figure 6b so that it can be referred to as loose.
  • the described walls are clearly removed from the ideal form, they are widely spaced apart, and a wedge-shaped gap is formed, which leads directly to the high-risk curved section 1k. The contents of the can can easily penetrate into this area and dissolves possibly on the paint layer protruding metal surfaces.
  • FIGS. 6a and 6b are in mm and can be readily referred to FIGS. 1 and 2 and the dimensions given there as well as the variables indicated there.
  • the rebate height fh is specified as 2.55 mm (in the case of FIG. 6a), which is reduced in the case of a fold that is closer to one another according to FIG. 6b. It should be noted that the reaching into the fold thicker coating pad 40 is not shown in the figures 6a, 6b, but mentally still has to be added.
  • FIG. 5 An alternative coating or application of a layer on the inner wall is carried out according to the example of Figure 5.
  • a conveyor belt 59 is shown on which a can body 1 with its opening pointing downward moves in the longitudinal direction. It is coated by a roller 50 which applies paint from a bath 55.
  • the paint is applied in the flange region 1a and on its substantially inwardly facing surface 6a.
  • the varnish thus attains to a greater extent the fold forming section 7 according to FIG. 4, the can being already shown reshaped in a section provided with a flange, but still without necking.
  • An intermediate roller 51 can even out the application of the paint from the bath 55 to the transfer roller 50.
  • FIG. 5 can also be used for beverage cans which already have a necked-in section 8, as shown in FIG. 4. Not suitable for the coating of the folding section is still a flange provided geometry (Figure 4, right section), here must be made for the application variant of Figure 5 only a deformation in the range 1v.

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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)

Claims (33)

  1. Procédé de fabrication ou de traitement d'enveloppes de boîtes (1) constituées de tôle mince d'une taille ou d'une hauteur donnée (D1, H1), avec au moins une couche de revêtement (39) sur une surface (6) de l'enveloppe (1) tournée essentiellement vers l'intérieur, l'enveloppe présentant :
    - une section de corps (9, 19),
    - une section de fond (10, 11, 12),
    - une section de bord supérieure (1v; 7; 1a, 1b, 1k) convenant à la formation d'un sertissage sur la section de corps,
    et dans lequel, au cours d'une opération d'application, le fluide formant la couche de revêtement (39)- est appliqué de manière' à adhérer sur la surface (6) tournée essentiellement vers l'intérieur en utilisant un volume prédéterminé du fluide adhérent, qui
    - convient à la taille de l'enveloppe, pour obtenir une épaisseur minimale (d0) de la couche de revêtement (39) dans la section de corps (9,19) et la section de fond (10) ; dans lequel la distribution du volume sur la surface (6), tournée essentiellement vers l'intérieur, de la section de corps et de la section de fond ainsi que sur une surface (6a) de la section de bord supérieure comme section de sertissage s'effectue de manière qu'en conservant l'épaisseur minimale (d0) sur la surface (6) de la section de corps et de la section de fond, cette fraction de volume du fluide adhérent atteigne la surface de la section de sertissage (1a, 1b, 1k; 1v) pour y atteindre, au moins le long d'une section de la surface, une épaisseur minimale (d) d'une couche de revêtement (40; 41, 42, 44) qui ne se situe pas en dessous d'une épaisseur minimale effectivement atteinte de la couche de revêtement (39) dans la section de corps (9).
  2. Procédé selon la revendication 1, dans lequel l'épaisseur minimale atteinte (d) dans la section de sertissage occupe au moins une zone plate.
  3. Procédé selon la revendication 1, dans lequel l'opération d'application est divisée en deux, une première application et une seconde application effectuée plus tard, et le volume du fluide se répartit en une première fraction de volume et une seconde fraction de volume, correspondant aux deux opérations d'application.
  4. Procédé selon la revendication 1 ou 3, dans lequel l'enveloppe métallique est d'abord déformée mécaniquement pour former une zone de col (1d, 8) dont le diamètre est plus petit qu'un diamètre de la section de corps (9) pour ensuite appliquer le fluide, en particulier par étranglement par emboutissage au tour.
  5. Procédé selon la revendication 1 ou 3, dans lequel le fluide est d'abord appliqué avant d'effectuer une déformation mécanique d'une section supérieure de la section de corps pour former une zone de col, en particulier par déformation au piston ou par étranglement par matriçage.
  6. Procédé selon la revendication 1 ou 3, dans lequel, dans au moins une des opérations d'application, la section de sertissage (1a, 1b, 1k) conserve l'épaisseur de revêtement (40) minimale prédéterminée s'étendant à plat par rapport à l'épaisseur minimale effective (d0) dans la section de corps (9) après la première ou la seconde application.
  7. Procédé selon la revendication 1, dans lequel la section de surface de la couche de revêtement (41, 42, 44; 40) s'étend sur la section de collet (1b,1k) dans la direction périphérique et au moins axiale.
  8. Procédé selon la revendication 7, dans lequel la section de surface s'étend également dans la direction radiale dans la section (44), dans laquelle elle est également conformée dans la direction axiale, pour former une surface inclinée par rapport à un axe (100) de l'enveloppe de la boîte.
  9. Procédé selon la revendication 1, dans lequel la section de surface de la couche de revêtement occupe une zone axialement nette de la section de sertissage et parvient en particulier en continu jusqu'à au moins une zone de courbure (1k) du section de sertissage.
  10. Procédé selon la revendication 9, dans lequel la section de surface passe au-delà de la zone de courbure (1k) pour former un section de la couche de revêtement (44), qui possède une extension correspondante, jusque dans un crochet (1a) de l'enveloppe de la boîte.
  11. Procédé selon la revendication 1, dans lequel l'enveloppe de boîte est une enveloppe déformée mécaniquement, en particulier un corps étiré constitué d'un matériau de tôle mince d'une épaisseur inférieure à 0,25 mm.
  12. Procédé selon la revendication 1, dans lequel l'enveloppe métallique est l'enveloppe d'une boîte de boisson.
  13. Procédé selon la revendication 12, dans lequel l'enveloppe (1) est remplie d'une boisson après séchage du revêtement et fermée ensuite par un couvercle (2) en formant un sertissage avec au moins une section de la section de sertissage.
  14. Procédé selon la revendication 1, dans lequel le fluide contient comme vernis une fraction de PET ou le vernis contient du poly(téréphtalate de butyle).
  15. Procédé selon la revendication 1 ou 13, dans lequel le vernis est cuit après l'application à une température supérieure à 200 °C, en particulier 270 °C.
  16. Procédé selon la revendication 1, dans lequel le fluide utiliser pour former la couche de revêtement (39, 40) est appliqué par pulvérisation sur l'enveloppe (30, 31) de la boîte.
  17. Procédé selon la revendication 1, dans lequel l'épaisseur minimale de la couche de revêtement (40) dans la section de sertissage est plus grande que 8 µm, en particulier supérieure à essentiellement 10 µm, 12 µm, 15 µm ou au-dessus.
  18. Procédé selon la revendication précédente, dans lequel une extension axiale ou radiale (h, k, m) de la couche de revêtement dans la section de sertissage (7, 1a, 1k, 1b) n'est pas inférieure à 2 mm et se situe en particulier entre 2,2 mm et 2,8 mm ou au-dessus de 3 mm.
  19. Procédé selon la revendication 1, dans lequel le fluide adhérent est un vernis, en particulier un vernis visqueux.
  20. Procédé selon la revendication 1, dans lequel il est prévu un sertissage entre la section de corps (9) et la section de fond (10).
  21. Procédé selon la revendication 1, dans lequel la couche de revêtement (40) dans le section de sertissage possède sous la forme d'un revêtement plat essentiellement une épaisseur restant égale (d) ou est unie au moins dans une section de courbure (1k,41) de la section de sertissage.
  22. Procédé selon la revendication 21, dans lequel l'épaisseur essentiellement égale (d) s'étend également dans une section essentiellement cylindrique (1b) de la section de sertissage.
  23. Procédé selon la revendication 21, dans lequel l'épaisseur essentiellement égale (d) du revêtement (44) s'étend également dans une section (1a) du crochet (1a, 1e) de l'enveloppe.
  24. Enveloppe de boîte d'une taille ou d'une hauteur donnée (D1, H1) pour un récipient formé d'une enveloppe et d'un couvercle (2), qui sont raccordés l'un à l'autre par un sertissage; dans laquelle au moins une couche de revêtement (40, 39) est appliquée sur une surface interne (6, 6a) de l'enveloppe (1), l'enveloppe de la boîte formée de tôle présentant :
    - une section de corps (9, 19),
    - une section de fond (10, 11, 12),
    - une section supérieure de bord (1v; 7) convenant à un sertissage sur la section de corps pour participer au moins partiellement au sertissage comme section de sertissage,
    et dans laquelle il est prévu une épaisseur minimale s'étendant à plat (d0) de la couche de revêtement (39) sur la surface (6) de la section de corps et de la section de fond ainsi qu'une épaisseur minimale à plat (d) d'une couche de revêtement (40, 41, 42, 43, 44) le long d'une section de surface dans le section de sertissage (1a, 1b, 1k, 1v), cette dernière épaisseur minimale (d) étant supérieure à 8 µm, en particulier supérieure à 10 µm.
  25. Enveloppe de boîte (1) selon la revendication 24, dans laquelle la couche de revêtement est constituée de vernis et la couche de vernis de la section de sertissage (7) possède une épaisseur, qui est en moyenne d'au moins 8 µm et l'épaisseur de la couche de vernis dans la section de sertissage est en moyenne 30 %, en particulier 40 % plus forte qu'une épaisseur moyenne de la couche de revêtement (40, 39) dans la section de corps (9, 19).
  26. Enveloppe de boîte (1) selon la revendication 24, dans laquelle le section de sertissage présente une zone de collet (1a, 1k, 1e) et une section (1b) qui s'étend essentiellement de manière cylindrique.
  27. Enveloppe de boîte (1) selon la revendication 24, dans laquelle l'enveloppe est une enveloppe déformée mécaniquement, en particulier un corps étiré, constitué d'une tôle d'une épaisseur inférieure à 0,25 mm.
  28. Enveloppe de boîte (1) selon la revendication 27, dans laquelle l'enveloppe est l'enveloppe d'une boîte de boisson.
  29. Enveloppe de boîte selon la revendication 24, avec un sertissage entre la section de corps (9) et la section de fond (10).
  30. Récipient fermé à paroi mince en tôle métallique en taille ou en hauteur donnée (D1, H1) avec une boisson, dans lequel une enveloppe (1) et un couvercle (2) sont calés mécaniquement l'un avec l'autre via un sertissage,
    dans lequel au moins une couche de revêtement (40, 39) est appliquée sur une surface (6, 6a) tournée essentiellement vers l'intérieur comme face interne de l'enveloppe (1), l'enveloppe de la boîte présentant :
    - une section de corps (9, 19),
    - une section de fond (10, 11, 12),
    - une section supérieur de bord (1v; 7) participant au moins en partie au sertissage sur la section de corps,
    et dans lequel sont prévues
    i. une épaisseur minimale à plat (d0) de la couche de revêtement (40, 39) sur la face interne (6) de la section de corps et de la section de fond, et
    ii. une épaisseur minimale à plat (d) d'une couche de revêtement (40, 41, 42, 43) le long d'un fragment de surface dans le sertissage (1a, 1b, 1k, 1v), cette dernière épaisseur minimale (d) étant supérieure à 8 µm, en particulier supérieure à 10 µm, et un couvercle de sertissage s'applique sur la section de bord.
  31. Récipient fermé à paroi mince selon la revendication 30, dans lequel il est prévu au moins une zone de col (1d; 3) sur au moins une extrémité axiale de l'enveloppe en dessous de la section de sertissage, dans laquelle zone de col la zone de corps (1w, 9) s'amincit dans un section de transition par réduction du diamètre vers la section de sertissage (7).
  32. Récipient fermé à paroi mince selon la revendication 30, dans lequel la couche de revêtement est un vernis, en particulier un vernis viscoélastique.
  33. Récipient fermé à paroi mince selon la revendication 30, dans lequel la couche de revêtement (40), le long du fragment de surface, est au moins 30 % en particulier 40 %, plus épaisse que l'épaisseur minimale à plat de la couche de revêtement sur la face interne de la section de corps.
EP01996439A 2000-11-17 2001-11-19 Stabilite a long terme d'une substance de remplissage contenue dans une boite-boisson en deux parties Expired - Lifetime EP1333945B1 (fr)

Applications Claiming Priority (3)

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

Publications (2)

Publication Number Publication Date
EP1333945A1 EP1333945A1 (fr) 2003-08-13
EP1333945B1 true EP1333945B1 (fr) 2006-01-11

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Country Link
EP (1) EP1333945B1 (fr)
AU (1) AU2002215855A1 (fr)
DE (2) DE10194904D2 (fr)
WO (1) WO2002040192A1 (fr)

Family Cites Families (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
AU7829081A (en) * 1981-02-02 1982-08-12 American Can Co. Metal coatings
FR2535684B1 (fr) * 1982-11-08 1985-12-06 Sireix Georges Contenant a fond et/ou a couvercle sertis et son procede 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
FR2720305B1 (fr) * 1994-05-26 1996-07-19 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
DE4446393C1 (de) * 1994-12-23 1995-12-21 Schmalbach Lubeca Compound-Dip-Verfahren für Metalldosen
FR2739354B1 (fr) * 1995-10-02 1997-10-24 Pechiney Recherche Procede de fermeture de recipient avec un couvercle par sertissage et thermoscellage

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DE50108708D1 (de) 2006-04-06
AU2002215855A1 (en) 2002-05-27
DE10194904D2 (de) 2003-11-06
EP1333945A1 (fr) 2003-08-13
WO2002040192A1 (fr) 2002-05-23

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