US20040050739A1 - One-sided covered marking on sheet metal surfaces - Google Patents

One-sided covered marking on sheet metal surfaces Download PDF

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Publication number
US20040050739A1
US20040050739A1 US10/416,068 US41606803A US2004050739A1 US 20040050739 A1 US20040050739 A1 US 20040050739A1 US 41606803 A US41606803 A US 41606803A US 2004050739 A1 US2004050739 A1 US 2004050739A1
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US
United States
Prior art keywords
impression
image
mark
sheet metal
reverse side
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.)
Abandoned
Application number
US10/416,068
Other languages
English (en)
Inventor
Lutz Strube
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ardagh Metal Beverage Germany GmbH
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
Assigned to BALL PACKAGING EUROPE GMBH reassignment BALL PACKAGING EUROPE GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: STRUBE, LUTZ
Publication of US20040050739A1 publication Critical patent/US20040050739A1/en
Abandoned legal-status Critical Current

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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 hiding marks on thin metal sheets or similar surfaces, especially in two part beverage cans, as well as such marked metal sheets.
  • the object of the invention is to suggest a method by which covered marking is provided on thin sheets wherein formation of a mark impressed on one side, preferably embossed or otherwise, of a thin metal sheet.
  • the image appearing on the other side of the metal sheet is not to appear according to the invention.
  • the subsequent embossing is carried out by means of a specially surface structured stamp which provides a textural, patterned or hatched impression (embossing) on the reverse side of the metal sheet which then reliably covers the image.
  • the original impression can, for example, be applied to the inside of a thin metal lid with its inside surface turned to the interior of the closed can.
  • the second stamping process is then applied to the outside of the lid that is part of the visible surface of the closed can.
  • the invention can also be applied to a lid made of thin sheet metal (claim 10) or a section of such a surface (claim 16) which has to be retained according to claim 1 or claim 14, or is actually retained after the embossing process.
  • the steps of the procedure immediately indicate how the section of the surface would appear after being impressed.
  • the embossing processes both of which alter the structure of the surface differ in depth of penetration and in regard to lateral extent (claim 6).
  • the second impression changes the properties, smoothness, or quality of the surface to hide the image of the first embossment.
  • the first deformation is locally more pronounced and penetrates deeper into the surface material and is still visible after the second impression.
  • the quality of the surface of the image can be compared with adjoining sections of the surface not affected by the first embossment.
  • the “thinness” of the metal sheets means either that we are dealing with material in sheet form, or that the concept thin sheet metal (German “Blech”) is sufficient to indicate that it actually is a thin metal sheet. Although thicker sheet metal is made, the thickness of the kind used in boxes for juices is not greater than 0.3 mm (claim 15). The thickness of the metal can also be seen with relation to the depth of penetration of the first impression (claim 5). Only when an image appears on the reverse side, the metal is regarded as “thin” and the second procedure is required to hide it.
  • a surface change by means of a covering layer like paint is not really an altered surface.
  • the outer layer can be regarded as being joined to the surface, but it can be removed.
  • surface deformations produced by pressure constitute a direct intrusion into the surface that cannot be removed from the metal sheet or from some other material like PET or plastic.
  • the direction of the deformation comprises a further advantage of impression by means of vertical pressure which alters the surface, since it can easily be implemented when boxes or lids are finished. Transverse motions cannot be applied directly, but such movements are not required.
  • the invention results in a clearly legible mark hidden in the finished product.
  • the advantage of, for example, embossing the mark is that it cannot be removed as could be done in the case a printed mark.
  • the impressed mark invariably leaves a mirror image on the visible side of the metal sheet, but this can be scrambled, guaranteeing that the mark is completely hidden. A rough surface is impressed over the image, completely covering it and making it practically unreadable.
  • One way of making a “scrambling” stamp is by using spark erosion. This would extend over the reverse side of the first embossment. It is also possible to apply spark erosion directly to the reverse image (claim 14) as a second surface change opposing the original impression. This process can be compared with sandpaper which penetrates into the surface thus corresponding to deformation by pressure, or spark erosion which removes surface particles; in any case, it constitutes a surface penetrating change.
  • FIG. 1 a partial perspective view of an upper section of a can, for beverages for example, which has a tear-out tab with a loop handle.
  • FIG. 2 is a partial view from above of the grip end of a loop handle which can be used for a tear-out tab.
  • FIG. 3 shows the cutout according to FIG. 2 of the reverse side.
  • FIG. 4 is a large-scale view of FIG. 3 after covering the image of the mark by means of a second impression according to the procedure.
  • FIG. 4 a
  • FIG. 4 b are cross sections of FIG. 4 illustrating the change of the surface after the first impression and the second impression.
  • FIG. 5 is a schematic representation of various further possible means of impression in the second process, combined in one image as a negative contour on the reverse side of a schematic stamp 20 .
  • FIG. 8 indicate sections of actual metal parts.
  • a container as shown in FIG. 1 consists of thin sheet metal and it is closed with a lid 3 which also consists of thin metal sheeting.
  • the latter exhibits a seam in the area of the lid tab 3 a, along which the tab can be torn out, at least partially, to result in an opening.
  • a loop 5 is provided which is fixed near one end to the lid tab 3 a by means of a rivet 4 .
  • a grip section 6 at the other end can be lifted, torn loose, and pressed into the opening.
  • FIG. 2 An enlarged section of one end of the grip 6 of the grip loop 5 (see FIG. 1) is shown in FIG. 2 as seen from below.
  • surface 6 a the end of the grip loop from below.
  • An embossed mark has been impressed in the surface near the grip end.
  • a numerical code has been carved or scratched into the surface comprising three separate systems 7 a, 7 b, and 7 c as arranged in area 3 a′.
  • FIGS. 8 a, 8 b and 8 c appear on the upper side 6 b according to FIG. 3 as can be seen in section 3 a ′.
  • the codes 7 embossed on the grip loop are hidden, being on the underside of grip section 6 , they can be deciphered directly from the outside as shown in FIG. 3.
  • FIG. 4 show that this image has been overlain by a textural, patterned, or crosshatched second impression.
  • the visible outer side 6 b of the grip end 6 of the grip loop is shown again.
  • the upper side is textured by a second impression 10 as indicated by 10 ′ in FIG. 4.
  • the texturing is a simple (narrow) hatching.
  • the subsequent impression is made with a specially structured stamp 10 ′ exhibiting a corresponding pattern in a surface of a textured field.
  • the texture changes the surface without applying a covering layer to the surface. No paint or any other covering is laid over the image 8 , but the texture of the surface itself is changed (structure, hatching, or any other penetrating shaping process) and this cannot be removed by scraping or otherwise.
  • This texture change is limited to the area where the images 8 of the previous impressions 7 are found, for example the regular delineated area 10 ′ shown in FIG. 4. This area lies within a strengthened edge section 6 c (for example the reshaped edges of the sheet metal loop) which comprises the grip end (section 6 ).
  • FIG. 4 a of section 3 a ′ for an explanation of the surface change.
  • the right half of the image shows where the first impression 7 has been applied which formed a definite image 8 a ′, 8 a ′′ on the reverse side, i.e. the outer surface 6 b.
  • the left half-image of FIG. 4 a shows the surface change on the outside ( 6 b ) corresponding to those of FIG. 3.
  • a texture in the shape of structure 11 (which will be explained further in terms of FIG. 5). The depth of penetration t 11 into this surface is shown.
  • the depth of penetration t 7 of the first impression 7 a ′, 7 a ′′ is obvious.
  • the cross-sectional structure of the sheet metal is changed and an image is pressed through on the other side. This image could either be raised or it is visible through an otherwise smooth surface because of the altered internal structure.
  • a second surface change is required on the side of the image. This is firmly set into the surface and it alters its integrity, smoothness, or quality in the sense that disorder is caused in the area concerned by means of directly induced surface changes.
  • the depth of penetration t 11 which has previously been described as obscuring the image is essentially less than t 7 .
  • the second surface change is not only less deep, but it is also more surface oriented than the first one.
  • the first impression is localized more strongly to make the mark recognizable.
  • the second alteration is restricted to the surface to hide the mark.
  • the concept of impression can be adapted to any suitable process by keeping the operation of the first and second penetrating intrusions in mind.
  • the texturing can also be formed in other ways than those shown in FIG. 4.
  • Several examples of impressing surfaces of a stamp 20 are shown in FIG. 5.
  • a serrated texture is embossed.
  • a texture consisting of fine small tightly packed cross impressions is shown.
  • a cross hatching is shown which appears negative after the second impression. All textures of FIG. 5 are depicted in combined form, and, when applied, they would cover the entire area 10 ′′ to change the surface structure of side 6 b.
  • the extent of boundary 10 ′′ is calculated to include the three images 8 a, 8 b, and 8 c and to form a regular boundary which has already approached a quadrilateral with boundary 10 ′ as explained in FIG. 4.
  • the lid tab 3 a can also carry a corresponding embossed code, but in this case also the appropriate area of the outer side of the lid must be textured or hatched by means of a second impression.
  • This process is applicable in any area where it is intended to obscure a code or mark impressed on a thin surface section.
  • FIG. 6 shows an example of a code 7 , 7 ′, 7 ′′ from the visible side.
  • the image 8 , 8 ′, 8 ′′ appears in FIG. 7.
  • Texture 11 is provided in a limited external area 10 ′′′ which extends over the maximum width of codes 7 , 7 ′, 7 ′′.
  • the boundary is regular and differs from the shape of the impressed lines of sevens arranged in a circle.

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)
  • Containers Opened By Tearing Frangible Portions (AREA)
  • Closures For Containers (AREA)
US10/416,068 2000-11-07 2001-11-07 One-sided covered marking on sheet metal surfaces Abandoned US20040050739A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10055050.9 2000-11-07
DE10055050 2000-11-07
PCT/DE2001/004185 WO2002038396A1 (de) 2000-11-07 2001-11-07 Einseitig verdeckte kennzeichnung an blechflächen

Publications (1)

Publication Number Publication Date
US20040050739A1 true US20040050739A1 (en) 2004-03-18

Family

ID=7662364

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/416,068 Abandoned US20040050739A1 (en) 2000-11-07 2001-11-07 One-sided covered marking on sheet metal surfaces

Country Status (10)

Country Link
US (1) US20040050739A1 (sh)
EP (1) EP1332053A1 (sh)
JP (1) JP2004523377A (sh)
CN (1) CN1473113A (sh)
AU (1) AU2002215843A1 (sh)
BR (1) BR0115163A (sh)
DE (1) DE10194768D2 (sh)
RU (1) RU2003117019A (sh)
WO (1) WO2002038396A1 (sh)
YU (1) YU33803A (sh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060076475A1 (en) * 2002-11-08 2006-04-13 Cochran Don W System and method for associating container defect information to a specific path of manufacturing

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008024938A1 (de) * 2008-05-23 2009-11-26 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Stanznietwerkzeug
JP7497598B2 (ja) * 2020-03-31 2024-06-11 東洋製罐株式会社 缶蓋開口用タブ、缶蓋、缶蓋開口用タブの製造方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4449042A (en) * 1982-03-01 1984-05-15 Can And Bottle Systems, Inc. Redeemable container with end closure redemption code
US5799525A (en) * 1996-07-19 1998-09-01 Aluminum Company Of America Tooling and method for the embossing of a container and the resulting container

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060076475A1 (en) * 2002-11-08 2006-04-13 Cochran Don W System and method for associating container defect information to a specific path of manufacturing
US7488965B2 (en) * 2002-11-08 2009-02-10 Pressco Technology Inc. System and method for associating container defect information to a specific path of manufacturing

Also Published As

Publication number Publication date
CN1473113A (zh) 2004-02-04
EP1332053A1 (de) 2003-08-06
YU33803A (sh) 2004-03-12
BR0115163A (pt) 2004-02-03
JP2004523377A (ja) 2004-08-05
RU2003117019A (ru) 2005-01-10
AU2002215843A1 (en) 2002-05-21
WO2002038396A1 (de) 2002-05-16
DE10194768D2 (de) 2003-11-13

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Legal Events

Date Code Title Description
AS Assignment

Owner name: BALL PACKAGING EUROPE GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:STRUBE, LUTZ;REEL/FRAME:014585/0039

Effective date: 20030627

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION