Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B44—DECORATIVE ARTS
  • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
  • B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
  • B44C1/24—Pressing or stamping ornamental designs on surfaces
• • 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
  • B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
  • B21D51/383—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures scoring lines, tear strips or pulling tabs
• • 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
  • B65D2203/00—Decoration means, markings, information elements, contents indicators
  • B65D2203/12—Audible, olfactory or visual signalling means

Definitions

• the invention relates to a method for concealed marking on thin sheet metal surfaces or the like, in particular in the case of two-part beverage cans, and to a sheet metal surface marked in this way.
• stamps or markings or other code symbols are applied to the thin sheet metal by embossed processes.
• Stamp and / or scratch embossing are preferred.
• the affixing of markings by embossing has the disadvantage that an image of the embossing and thus of the code or the marking or marking is formed on the side of the thin sheet metal facing away from the embossing. Although the image appears mirror-inverted, it can be deciphered without difficulty. This is often not desirable.
• embossing in particular by embossing or the like.
• the image occurring on the other sheet metal side or sheet metal surface due to the embossing should not appear in accordance with the invention.
• the thin sheet is subsequently subjected to an embossing process from the side on which the image is shown, in such a way that on the one hand the viewing and
• the legibility of the marking obtained by the embossing is essentially retained on one side of the sheet, while on the side of the sheet facing away from it the impression is covered by the embossing in such a way that the marking is no longer legible or decipherable.
• the embossing is advantageously carried out with the aid of a stamp structured in a special way, so that there is a texture, pattern or hatch-like embossing on the side facing away from the embossing, which subsequently reliably covers the resulting image.
• the embossing can be provided, for example, on the inner surface of a thin sheet metal cover, which inner surface faces the interior of the can when the can is closed.
• the Embossing takes place from the outside of the sheet metal lid, i.e. from the surface visible when the box is closed.
• Tear-off lids are often used, which can be torn open with the help of a shaped tear-open tab made of thin sheet metal. It is also advantageous according to the invention to provide the embossing or the like (penetrating into the surface) of compression deformation on the underside of the grip tab, so that it is hidden when the grip tab is attached (claim 17). The recognizable image of the marking which arises on the upper side of the grip tab is then covered by an embossing from the upper side, which is in particular textured, patterned or hatched (claim 11).
• the invention also relates to a cover made of thin sheet metal (claim 10) or a sheet metal surface section (claim 16) which can be obtained by a method according to claim 1 or 14 or is also obtained when the method is carried out.
• the process steps immediately indicate how the sheet metal surface section looks after the action of the process steps.
• embossing each of which changes the structure of the surface, have different depths and are also differently designed in terms of their lateral extension (claim 6).
• the embossing changes the quality, smoothness or quality of the surface to hide the image of the initial deformation.
• the first deformation itself is a more locally shaped indentation, i.e. also a surface change that penetrates deeper into the material of the surface in order to remain visible even after the second surface change has taken effect.
• the section of the image can be compared with the adjacent sections of the surface that are not affected by the initial deformation.
• the "thin” sheet thickness can be described so that it is either a sheet material, or the term "sheet” alone is sufficient to show that it is a small sheet thickness. Sheets are also made in larger thicknesses, but not above 0.3 mm for the area of beverage cans (claim 15). The thickness of the sheet can also depend on the depth of penetration First deformation (the first stamping) are related (claim 5). Only if an image is created on the opposite side of the surface is the sheet to be regarded as "thin sheet” and the subsequent modification of the surface is used on the image side to hide.
• a change in surface is not such a change that is possible by covering with a cover layer (e.g. color).
• a layer would be attached to the surface, but not insoluble.
• the deformations of the surface that occur under pressure are designed to engage directly in the surface, so that they are permanently connected to the surface section made of, for example, sheet metal or other materials, such as PET, plastic.
• Another advantage of the vertical pressure applied to change the surface lies in the direction of the deformation that is available in the manufacture and processing of sheet metal in the manufacture of cans and the manufacture of lids. Cross movements are not readily available, but are also not required for the invention.
• the stamps used for "scrambling" can be formed by spark erosion in order to design a surface section to hide the image of the first change. Spark erosion can also be used directly to change the surface that has the images (claim 14); it is then a second change that counteracts the first change on only one side. The effect can be compared to sandpaper that is in the
• Figure 1 is a partial perspective view of an upper portion of a can, e.g. a beverage can, which has a tear-open lid with a grip tab.
• Figure 2 is a partial top view of the handle end of a handle tab that can be used with a tear-open lid.
• FIG. 3 shows the section of Figure 2 from the opposite
• FIG. 4 shows the view according to FIG. 3 on an enlarged scale, but after the marking image has been overlaid by means of an embossing according to the invention.
• Figure 4b are cross sections of Figure 4 illustrating the
• FIG. 5 schematically shows various further possible embodiments of the embossing, summarized in an illustration and as a negative contour on the underside of a stamp 20 shown schematically.
• FIG. 8 show sections of real sheet metal parts.
• a container 1 shown in FIG. 1 consists of thin sheet metal and is closed with a lid 3, which is also made of thin sheet metal.
• this has a line of weakness, not shown, along which the cover mirror 3a can be at least partially torn open in order to expose a removal opening.
• a grip tab 5 is provided which is fastened near the one end via a rivet 4 to the cover mirror surface 3a and has a grip section 6 at the other end so that it can be pried open and thereby shear off and press in the opening part.
• the handle end 6 (the handle portion) of the handle tab 5 of Figure 1 is shown on an enlarged scale and in detail, namely from the bottom. So you can see the underside surface 6a of the handle end of the handle tab. From this side there is a marking or marking in the area of the handle end by an embossing process penetrating the surface, in particular a notch or
• Scoring has been applied, in the present case in the form of a numerical code of three individual systems 7a, 7b, 7c arranged in the area 3a '.
• a mirror image 8 of the code 7 embossed on the underside is obtained, consisting of the numbers 8a, 8b and 8c on the sheet metal section 3a '.
• the embossed coding 7 is arranged in a concealed manner when the grip tab is attached to the cover mirror 3a, since it is located on the underside of the grip section 6, the coding can easily be deciphered from the outside, as shown in FIG. 3.
• Handle tab 5 shown.
• the surface area to which the coding 7 is attached on the underside of the grip section is textured on the upper side by an embossing 10, as is indicated within the area 10 'in FIG. 4.
• the texturing is a simple (tight) hatching.
• the post-embossing is carried out with a specially structured stamp, the surface of which has a corresponding pattern in the texture field 10 '.
• the texture changes the surface without a top layer being applied to the surface. No color or covering is therefore placed over the images 8, but rather a texture (structure, hatching or other penetrating design) which changes the surface and which is firmly and directly connected to the surface, that is to say cannot be scraped off.
• the extent of this texture is limited to the area into which the images 8 of the initial deformations 7 of FIG. 2 extend, that is to say, for example, the regularly delimited area 10 'of FIG. 4. This area in turn lies within a reinforced edge section 6c (for example, through reshaped edges) the sheet metal tab), which make up the handle end as a handle section 6.
• FIG. 4a To clarify the change in the surface, reference is made to the cross section of FIG. 4a.
• a cross section of the surface section 3a ' is shown, the embossment 7 occupied by the first surface change being introduced in the right half image of FIG. 4a, which produces an image 8a', 8a "which is not necessarily raised on the opposite surface side, that is to say the outside 6b 4a shows the surface change on the outer surface 6b corresponding to the surface of FIG. 3, here with the application of a texture in the form of a structure 11 that changes the surface (as will be explained later with reference to FIG. 5) Depth of penetration t,., Shown on this surface side.
• Image 8a ', 8a ", corresponding to sections from number 8a of FIG. 3, takes place through the second surface change, which is carried out on the side of the image.
• the depth of penetration t is significantly less than the depth of penetration t 7 , which was previously as
• the ratio of the penetration depths ensures that even after the
• the second surface change is also more surface-oriented than the first change.
• the first change is more localized to the
• the second change is more area-oriented to make the image unrecognizable. However, both are predisposed so that they act directly and directly on the surface, thereby changing them and thus being firmly and permanently connected to the patch that they mark from one side (page 6a) and from the other side Do not label (page 6b).
• Sheet metal parts are predominantly used here, but other materials can also be used, such as plastics or other materials that can be deformed with regard to their surface structure.
• embossing is then to be adapted to the appropriate technical terms in the respective processing sector, while maintaining the effect of the first and second penetrating ones
• the texturing can also be designed differently than shown in FIG. 4.
• Several examples of the embossing surface of a stamp 20 are indicated together in FIG. 5.
• a point-like texture is stamped on the sheet.
• a texture is shown, which consists of fine small and densely stored cross embossing.
• Cross hatching is shown at 13, which is generated correspondingly negatively during the post-embossing. All textures of FIG. 5 are shown in a summarized manner and would cover the entire limited area 10 ′′ with their respective application, with which the side 6b with regard to their
• the extent of the boundary 10 " is dimensioned such that the three images 8a, 8b and 8c are acquired and a regular boundary is formed, as has already been explained as an approximate square with the boundary 10 'in FIG.
• the cover mirror 3a can also carry a corresponding embossed coding, in which case the outward-facing side of the cover in corresponding area is textured or hatched by embossing.
• FIG. 6 shows an example of a code 7, 7 ', 7 "from the visible side.
• FIG. 7 illustrates its imprint 8, 8', 8".
• FIG still without underlying imprint code numbers 8.
• FIG. 7 is combined with FIG. 8 in order to obtain the “encryption” of the impression.
• the texture 11 is provided in an outer boundary 10 '' which extends beyond the maximum extent of the digits 7, 7 ', 7' '.
• the boundary is regular and deviates from the shape of the embossed lines of the digits 7, shown here as a circular area.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Details Of Rigid Or Semi-Rigid Containers (AREA)
• Shaping Metal By Deep-Drawing, Or The Like (AREA)
• Closures For Containers (AREA)
• Containers Opened By Tearing Frangible Portions (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=7662364

Family Applications (1)

Country Status (10)

Families Citing this family (3)

Family Cites Families (2)

• 2001
  • 2001-11-07 JP JP2002540951A patent/JP2004523377A/ja active Pending
  • 2001-11-07 WO PCT/DE2001/004185 patent/WO2002038396A1/de not_active Application Discontinuation
  • 2001-11-07 DE DE10194768T patent/DE10194768D2/de not_active Expired - Fee Related
  • 2001-11-07 AU AU2002215843A patent/AU2002215843A1/en not_active Abandoned
  • 2001-11-07 BR BR0115163-0A patent/BR0115163A/pt not_active Application Discontinuation
  • 2001-11-07 RU RU2003117019/12A patent/RU2003117019A/ru not_active Application Discontinuation
  • 2001-11-07 EP EP01993550A patent/EP1332053A1/de not_active Withdrawn
  • 2001-11-07 CN CNA018185177A patent/CN1473113A/zh active Pending
  • 2001-11-07 US US10/416,068 patent/US20040050739A1/en not_active Abandoned
  • 2001-11-07 YU YU33803A patent/YU33803A/sh unknown

Non-Patent Citations (1)

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