US20140322557A1 - Method for producing an aluminum foil with integrated security features - Google Patents

Method for producing an aluminum foil with integrated security features Download PDF

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Publication number
US20140322557A1
US20140322557A1 US14/346,767 US201214346767A US2014322557A1 US 20140322557 A1 US20140322557 A1 US 20140322557A1 US 201214346767 A US201214346767 A US 201214346767A US 2014322557 A1 US2014322557 A1 US 2014322557A1
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US
United States
Prior art keywords
aluminum foil
aluminum
cold rolling
roller
security features
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
US14/346,767
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English (en)
Inventor
Christof Brunnthaler
Rainer Huber
Martin Kornfeld
Adolf Schedl
Lambert Nekula
Wilhelm Zuser
Engelbert Scharner
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.)
Constantia Teich GmbH
Original Assignee
Individual
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 Individual filed Critical Individual
Assigned to CONSTANTIA TEICH GMBH reassignment CONSTANTIA TEICH GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HUBER, RAINER, KORNFELD, MARTIN, NEKULA, LAMBERT, SCHARNER, ENGELBERT, ZUSER, WILHELM, SCHEDL, ADOLF, Brunnthaller, Christof
Publication of US20140322557A1 publication Critical patent/US20140322557A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H8/00—Rolling metal of indefinite length in repetitive shapes specially designed for the manufacture of particular objects, e.g. checkered sheets
    • B21H8/005—Embossing sheets or rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/227—Surface roughening or texturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/40—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling foils which present special problems, e.g. because of thinness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B2003/001—Aluminium or its alloys
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/30—Foil or other thin sheet-metal making or treating
    • Y10T29/301—Method
    • Y10T29/302—Clad or other composite foil or thin metal making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12431—Foil or filament smaller than 6 mils

Definitions

  • the invention relates to a process for the manufacture of an aluminum foil with integrated security features as well as to an aluminum foil with integrated security features manufactured by this process.
  • Medical products which are generally packaged with the help of aluminum foils are often a target for forgeries.
  • Forgery-proof features should therefore be as close as possible to the medical product, which means the direct application of security features during the manufacturing process of primary packaging offers the best conditions herefor.
  • a process of the above-mentioned type whereby an aluminum foil in several cold roll reduction passes is rolled to a thickness of less than 150 ⁇ m and whereby at the same time a texturing extending in rolling direction is created on both faces of the aluminum foil, whereby a loose composite is formed from at least two such aluminum foils, which is guided in a final rolling pass to a working roller pair, in which on at least one roller surface the relief type surface structuring produced by grinding is reduced, depending on contrast and motif in the range of 10-50% relative to the average depth of roughness for the formation of a motif for a security feature which is transferred to the outer face of the aluminum foil facing the roller surface, after which the loose composite of aluminum foils is separated.
  • the invention further relates to an aluminum foil with integrated security features, which is manufactured according to the process of the invention and which has security features to an extent of at most 30% per unit of surface.
  • FIG. 1 shows a working roller pair for the execution of the process in accordance with the invention.
  • FIG. 2 shows a detailed view of one working roller as well as its surface design
  • FIG. 3 shows the Stribeck curve for the documentation of the relevant process parameters in the roller gap
  • FIG. 4 shows the process sequence of the process for the manufacture of the integrated security features.
  • FIGS. 5-8 show possible embodiments of the integrated security feature.
  • the manufacturing process for the aluminum foil 1 in accordance with the invention with integrated security features 6 consists first of all of the sub-processes of strand casting, homogenization, hot rolling, cold rolling and subsequent annealing above the recrystallization temperature. This is followed by the foil cold rolling process.
  • the aluminum foil 4 is thereby rolled out in several cold rolling passes to a thickness of less than 150 ⁇ m, by which simultaneously on both outer faces 4 a , 4 b of the aluminum foil a texturing 5 a , 5 b is created in rolling direction, as shown in FIG. 4 b .
  • This structured roughness formed in rolling direction leads to a directed reflection of the incident light, so that because of this directed reflection the outer faces 4 a and 4 b have a glossy appearance.
  • the process is modified for the last rolling pass as shown in FIG. 1 as well as FIG. 4A , whereby a working roller pair 9 is used in which at least one roller surface has a motif 6 ′ for the security feature.
  • This motif 6 ′ is produced in that the relief-like surface structuring 11 a which is produced in rolling direction by grinding, is reduced depending on the contrast and motif in the range of 10-50% relative to the average roughness depth. This can be carried out, for example, by the action of laser beams as shown in FIGS. 2 b , 2 c and 4 c .
  • a loose composite 8 is formed, for example, from two glossy aluminum foils 4 by way of a release agent 7 , as shown in FIGS. 1 and 4 b .
  • This loose composite 8 is fed into the closed roller gap 9 ′, which is formed between the two working rollers 10 , 11 .
  • the motif for the security feature 6 is now transferred onto the outer surface 4 a of the aluminum foil which is directed towards the working roller.
  • a random texturing which appears dull is now formed in the region of the security feature 6 of the aluminum foil 1 —see FIG. 4 d —which is visibly distinguished from the remaining outer surface region 2 a with glossy appearance and directed texturing 3 . Because of this random texturing, a diffused reflection of the incident light occurs in the region of the security feature 6 , so that the region of the security feature 6 appears dull.
  • the outer surface 2 b of the aluminum foil 1 which is directed away from the roller surface is covered by the release agent 7 as well as the second aluminum foil—referred to as 4 ′ for reasons of clarity.
  • the contact sides of the two foils are identified by the roller grooves of the proceeding rolling step and by way of the roughness newly generated during the coupled rolling, which roughness is primarily directed transverse to the rolling direction. A diffused scattering occurs because of the random texturization of these surfaces.
  • the loose composite of the aluminum foil 1 with integrated security feature 6 manufactured in accordance with the invention, and the aluminum foil 4 ′ is separated.
  • the aluminum foil 4 ′ has on its outer surface 4 ′a directional structuring 5 ′ a , so that this outer surface appears glossy, whereas the second outer surface 4 ′ b has a random structuring and therefore provides a dull surface.
  • the foil rolling process underlying the process in accordance with the invention belongs to the subcategory “flat rolling” and is defined especially through process end products with a thickness of 20 ⁇ m.
  • the cold rolling process in this thickness range requires the specific application of surface roughness values on the tools in combination with the procedural liquid which create the tribologic conditions in the rotor cap required for the plastic deformation.
  • the Stribeck curve see FIG. 3 —for the documentation of the process parameters relevant for the procedure.
  • the co-efficient of friction is represented on the X axis and the function of speed, pressure and viscosity is represented on the Y axis.
  • the mixed friction range is required for the cold rolling of foils. In a region of little lubrication, a continuous contact with the rolled material occurs: a reduction of the material in this region is not possible and leads in the following to poor surface properties and damage of the roller. In a region of hydrodynamic lubrication—see in this respect Reference no. 14 in FIG. 2 a —the working roller 11 starts to float so that a directed control of the rolling process and especially of the reduction of the material thickness is no longer possible.
  • the range of mixed friction can thereby be adjusted by varying the parameters V, P and N.
  • the mixed friction conditions in the roller gap 9 ′ are required, since only a defined friction coefficient enables the application of longitudinal tension stress.
  • This longitudinal tension stress acts against the deformation strength and is during the foil rolling the essential factor for the achievement of the deformation resistance. A thickness reduction without this longitudinal tension stress is not possible from a technical point of view.
  • the roller speed is used as the secondary control parameter in order to vary the lubricant film thickness (hydrodynamic lubricant input).
  • a mixed friction condition which is characterized by the simultaneous occurrence of boundary friction and liquid friction.
  • liquid friction which is the hydrodynamic lubrication 14
  • both surfaces are completely separated from one another.
  • the transferred shear stress depends on the dynamic viscosity of the lubricant and the speed differential between the working roller and the aluminum foil.
  • both surfaces are separated only by a lubricant layer which is only a few molecule layers thick, whereby the viscosity of the lubricant plays only a subordinate role.
  • the ratio between boundary friction and liquid friction over the length of the roller gap depends on the layer thickness of the input lubricant and the roughness of the working roller and the aluminum foil
  • the mechanism for influencing the lubricant film thickness 13 depends on the hydrodynamic lubricant input, the input of lubricant into the roughness valleys 11 b as well as the attachment of lubricant particles, see FIG. 2 b.
  • the hydrodynamic lubricant input 14 primarily occurs in the input zone to the roller gap 9 ′.
  • the input zone thereby forms a wedge shaped gap 12 , whereby the working roller 11 and the aluminum foil 4 as limiting surfaces during their movement in direction of the wedge tip pull along lubricant 13 in the form of a film, see FIG. 2 a .
  • the hydrodynamic pressure buildup thereby caused in the rolling oil is dependent for the rolling speed, the viscosity of the lubricant and the geometry of the roller gap. As soon as the yield criterion for the aluminum foils 4 is fulfilled, they are plastically deformed and the layer thickness of the lubricant present at this location is pulled into the roller gap 9 ′.
  • lubricant is input into the surface depressions, the so-called roughness valleys 11 b , on the working roller 11 and the aluminum foil 4 , see FIG. 4 c .
  • This process depends, apart from the oil storage volume of the surfaces, also on the orientation of the surface structure.
  • This mechanism can be used for the directed change of the friction conditions and in the following serves to create a changed surface texture because of the liquid friction generated. This occurs because of the missing contact with the working roller and the thereby missing texturing in rolling direction.
  • Boundary layers are formed on the surface of the working roller and the aluminum foil, which are carried into the roller gap 9 ′, because of physiosorption and chemisorption of lubricant components, for example surface active additives.
  • This mechanism is influenced by the roller material and the rolled material as well as the chemical composition of the rolling oil 12 and its temperature. Since the temperature and the composition of the rolling oil 12 with respect to the accretion of lubricant components in the process in accordance with the invention are not different from the conventional cold rolling process, this mechanism is not further discussed.
  • the produced aluminum foil 1 with integrated security features 6 is copied with optical processes in several passes for the purposes of analysis.
  • representative foil samples are produced in the format A4.
  • epoxy resin imprints of the surface are produced and measured by way of a reflected light microscope and infinite focus.
  • FIG. 5 shows the illustration of a security feature 6 consisting of the lettering security in combination with the illustration of a staff of Asclepius customary in the medical industry.
  • the latter is here illustrated only by way of example and without claim to any exclusionary rights.
  • the outer surface illustrated in FIG. 5 b which during the rolling process was directed away from the roller surface, includes no undesired negative print motifs whatsoever of the previously mentioned security feature.
  • FIG. 6 A fantasy illustration of a security feature 6 is shown in FIG. 6 whereby in the section b, see FIG. 6 b , it is apparent that in the region of the security feature 6 a dull surface is present while in the respectively bordering surface regions the structuring 3 in longitudinal direction continues to be maintained, whereby the surface appears glossy.
  • FIG. 7 also shows an image taken by way of scanning electron microscopy of a security feature 6 .
  • the surface In the region of the security feature, the surface is dull, whereby in the bordering surface regions the surface appears glossy.
  • the detailed views according to FIG. 7 a or 7 b show that this different effect is caused by the surface being rough in the region of the security feature 6 while it is structured in longitudinal direction in the bordering regions.
  • FIG. 8 This applies analogous to the image shown in FIG. 8 of an aluminum foil 1 manufactured in accordance with the invention with the integrated security feature 6 Security taken according to the infinitive focus analysis. From the illustrations of FIGS. 8 a , 8 b , 8 c and 8 d , it is also apparent that a random texturing is present in the region of the security feature 6 , whereas in the bordering regions a directed structuring 13 is present.
  • optical features such as the security feature 6 are applied by the directed application of differing surface textures of the aluminum foils in the range of the fourth order. No significant difference in the roughness depth can be determined, but a difference in the type of texturing of grooves and scaling is achieved. A change of the shape of the aluminum foil is not detectable so that a strikethrough to the foil backside does also not occur.
  • embossment impression processes
  • the surface structure of the aluminum foil 4 is changed during the mechanical working, whereby it is made possible to develop on the surface one or more security features 6 .
  • An imitation by way of conventional finishing technologies is not possible or is easily identifiable as such.
  • the manufacture and the further processing of the aluminum foil 1 in accordance with the invention with integrated security features 6 is, with respect to the number of manufacturing steps, not distinguished from the processing of conventional, rolled aluminum foils and can thereby be easily implemented in the conventional manufacturing process for pharma products.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Laminated Bodies (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
US14/346,767 2011-09-22 2012-08-27 Method for producing an aluminum foil with integrated security features Abandoned US20140322557A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP11450126.5A EP2572807B1 (de) 2011-09-22 2011-09-22 Verfahren zum Herstellen einer Aluminiumfolie mit integrierten Sicherheitsmerkmalen
EP11450126.5 2011-09-22
PCT/AT2012/000222 WO2013040612A1 (de) 2011-09-22 2012-08-27 Verfahren zum herstellen einer aluminiumfolie mit integrierten sicherheitsmerkmalen

Publications (1)

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US20140322557A1 true US20140322557A1 (en) 2014-10-30

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US14/346,767 Abandoned US20140322557A1 (en) 2011-09-22 2012-08-27 Method for producing an aluminum foil with integrated security features

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US (1) US20140322557A1 (de)
EP (1) EP2572807B1 (de)
JP (1) JP5996653B2 (de)
KR (1) KR101975313B1 (de)
CN (1) CN103889604B (de)
CA (1) CA2819772C (de)
ES (1) ES2492520T3 (de)
HR (1) HRP20140861T1 (de)
MX (1) MX348425B (de)
PL (1) PL2572807T3 (de)
RU (1) RU2598413C2 (de)
SI (1) SI2572807T1 (de)
WO (1) WO2013040612A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9649676B2 (en) 2012-10-29 2017-05-16 Constantia Teich Gmbh Method for producing an aluminium foil with integrated security features
US11161161B2 (en) * 2016-04-29 2021-11-02 Primetals Technologies Austria GmbH Method for rolling a product to be rolled
CN113634607A (zh) * 2021-07-01 2021-11-12 乳源东阳光优艾希杰精箔有限公司 一种铝箔轧机轧制油及其在铝箔制备中的应用
CN118002625A (zh) * 2024-04-09 2024-05-10 太原理工大学 一种不锈钢带改性轧制压下率确定方法、装置及设备

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CN108856291A (zh) * 2018-05-17 2018-11-23 河钢股份有限公司承德分公司 一种强度750MPa级极薄花纹板的轧制方法

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US4927070A (en) * 1989-03-10 1990-05-22 Steven D. Kretchmer Method for making multi-colored composite laminates
US4996113A (en) * 1989-04-24 1991-02-26 Aluminum Company Of America Brightness enhancement with textured roll
US5025547A (en) * 1990-05-07 1991-06-25 Aluminum Company Of America Method of providing textures on material by rolling
US5105638A (en) * 1990-07-12 1992-04-21 Mitsubishi Jukogyo Kabushiki Kaisha Method and machine for rolling a metal workpiece at a reduced rolling load
US5390518A (en) * 1992-11-10 1995-02-21 Mitsubishi Jukogyo Kabushiki Kaisha Method for shining metal sheet surfaces and method for cold-rolling metallic materials
US5537851A (en) * 1993-01-05 1996-07-23 Aluminum Company Of America Sheet product produced by massive reduction in last stand of cold rolling process
US6790387B1 (en) * 1997-04-07 2004-09-14 Alcan International Limited Process of producing diffraction gratings on the surface of articles
US6322872B1 (en) * 1997-07-17 2001-11-27 Alusuisse Technology & Management Ltd. Rolled product of metal exhibiting a light-spreading surface structure
US6187455B1 (en) * 1998-03-24 2001-02-13 Hunter Douglas International N.V. Decorative roll-patterned strip and process of making same
US6324978B1 (en) * 1999-01-22 2001-12-04 Vaw Aluminum Ag Printing plate substrate and method of making a printing plate substrate or an offset printing plate
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US20080060405A1 (en) * 2004-12-03 2008-03-13 Ball Melville D Roll embossing of discrete features
US20110183154A1 (en) * 2008-04-18 2011-07-28 Hydro Aluminium Deutschland Gmbh Method for Producing a Strip for Packaging Purposes
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9649676B2 (en) 2012-10-29 2017-05-16 Constantia Teich Gmbh Method for producing an aluminium foil with integrated security features
US11161161B2 (en) * 2016-04-29 2021-11-02 Primetals Technologies Austria GmbH Method for rolling a product to be rolled
CN113634607A (zh) * 2021-07-01 2021-11-12 乳源东阳光优艾希杰精箔有限公司 一种铝箔轧机轧制油及其在铝箔制备中的应用
CN118002625A (zh) * 2024-04-09 2024-05-10 太原理工大学 一种不锈钢带改性轧制压下率确定方法、装置及设备

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Publication number Publication date
JP5996653B2 (ja) 2016-09-21
WO2013040612A1 (de) 2013-03-28
KR20140077159A (ko) 2014-06-23
ES2492520T3 (es) 2014-09-09
MX2014003290A (es) 2014-12-05
CN103889604A (zh) 2014-06-25
PL2572807T3 (pl) 2014-11-28
HRP20140861T1 (hr) 2014-10-24
KR101975313B1 (ko) 2019-08-28
SI2572807T1 (sl) 2014-10-30
RU2013122467A (ru) 2014-11-20
EP2572807B1 (de) 2014-06-11
JP2015502254A (ja) 2015-01-22
RU2598413C2 (ru) 2016-09-27
CA2819772A1 (en) 2013-03-28
EP2572807A1 (de) 2013-03-27
CN103889604B (zh) 2016-12-28
CA2819772C (en) 2015-08-11
MX348425B (es) 2017-06-12

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