EP2265509A1 - Étiquette de sécurité - Google Patents

Étiquette de sécurité

Info

Publication number
EP2265509A1
EP2265509A1 EP09719044A EP09719044A EP2265509A1 EP 2265509 A1 EP2265509 A1 EP 2265509A1 EP 09719044 A EP09719044 A EP 09719044A EP 09719044 A EP09719044 A EP 09719044A EP 2265509 A1 EP2265509 A1 EP 2265509A1
Authority
EP
European Patent Office
Prior art keywords
layer
security label
security
label according
carrier
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.)
Granted
Application number
EP09719044A
Other languages
German (de)
English (en)
Other versions
EP2265509B1 (fr
Inventor
Aranzazu Escudero Vallejo
Uwe Michel
Bernhard MÜSSIG
David Tuffe
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.)
Tesa SE
Original Assignee
Tesa SE
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 Tesa SE filed Critical Tesa SE
Publication of EP2265509A1 publication Critical patent/EP2265509A1/fr
Application granted granted Critical
Publication of EP2265509B1 publication Critical patent/EP2265509B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • B65D55/00—Accessories for container closures not otherwise provided for
    • B65D55/02—Locking devices; Means for discouraging or indicating unauthorised opening or removal of closure
    • B65D55/026—Locking devices; Means for discouraging or indicating unauthorised opening or removal of closure initial opening or unauthorised access being indicated by a visual change using indicators other than tearable means, e.g. change of colour, pattern or opacity
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/02—Forms or constructions
    • G09F3/0291—Labels or tickets undergoing a change under particular conditions, e.g. heat, radiation, passage of time
    • G09F3/0292—Labels or tickets undergoing a change under particular conditions, e.g. heat, radiation, passage of time tamper indicating labels
    • 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
    • B65D2401/00—Tamper-indicating means
    • B65D2401/05—Tearable non-integral strips

Definitions

  • the present invention relates to a security tag for use as a tamper evident.
  • Security tags are commonly used to indicate the initial opening of an item labeled with the security tag, such as a door or a box.
  • security labels typically have at least one optical feature that irreversibly indicates an attempt to open, such as detachment from the article provided with the security label.
  • the security labels serve as a seal for the integrity of the object before Rou Anlagen Anlagen.
  • the security label is glued to the article in such a way that it can not be opened without detaching or cutting the security label.
  • the security label must be so connected to the object that a detachment and subsequent reapplication is not possible without visible impairment. This is usually achieved by a suitable adhesive bond with the article in combination with an optical feature.
  • the term “security label” encompasses both designs with limited dimensions, such as diecuts, and also strip-shaped designs, such as adhesive tapes.
  • Security labels are known from the prior art (WO 97/44769 A1, EP 0 205 457 B1). Security labels are commercially available such. Under the product name tesa® SecuritySeal. Security labels can be constructed so that they have a layer structure with layers adhering to each other to different degrees. This layer structure is usually not visible to the naked eye before a first detachment attempt. In a peel test, however, the layer structure is destroyed due to different bond strengths within the layer structure, so that a visible impairment of the security label remains, which also can not be reversed by re-bonding the affected layers. The impairment may be, for example, that by the detachment of individual layers lettering is recognizable.
  • the control of such product shreds is particularly difficult under adverse conditions such as darkness or draft.
  • the present invention is therefore based on the problem of specifying a security label, which can not only be used as Warö Stammsnach Stamm and can be redetached residue-free, but is also optimized in terms of ease of use.
  • the present invention solves the above-described problem with a security label having the features of the preamble of claim 1 by the features of the characterizing portion of claim 1.
  • Preferred embodiments and further developments are the subject of the subclaims.
  • a security label according to the invention has a carrier and below the carrier an adhesive layer for fixing the label on an object to be secured.
  • further layers such as, for example, color layers, adhesion-controlling functional layers or the like, may be arranged between the carrier and the adhesive layer.
  • the carrier of the security label also has at least two layers A, B on. In any case, these two layers A, B differ from each other in terms of their tensile set.
  • the tensile set is defined as the strain remaining in a specimen in the unloaded state after being subjected to constant elongation for a certain time (in the present case 1 minute) (DIN ISO 2285: 2003-07).
  • the tensile set is given as a percentage of the elongation.
  • the security label is stretchable and has a minimum value for its maximum elongation.
  • the different Switzerlandverformungsrest takes place at an elongation of the security label, as occurs in a peel test of the bonding substrate, and a subsequent relaxation a permanent three-dimensional deformation. This deformation forms with it a label that irreversibly indicates a detachment attempt of the security label from the bonding substrate.
  • the carrier is substantially unstretched, i. the preparation of the carrier takes place without a specific stretching, so it has not been forcibly oriented in a semi-crystalline state in one or more directions.
  • the carrier is unstretched so that it can have a sufficient elasticity.
  • An orientation in the molten state, such as may occur in an extrusion, for example, is not a (controlled) drawing (stretching).
  • the carrier can also have further layers which support the three-dimensional deformation upon stretching or which perform completely different tasks.
  • the layers A, B are arranged directly above one another. This arrangement allows the best possible matching of the two layers to one another in order to achieve a desired deformation.
  • the security label with the length L 0 After the security label with the length L 0 has fulfilled its purpose of sealing an opening, it can be removed from the bonding substrate essentially without leaving any residue by using its extensibility by stretching.
  • the security label preferably has a maximum extensibility of at least 100%, very preferably of at least 500%. In the stretched state, the security label then has a length of L 1 with L 1 > L 0 .
  • the security tag is designed so that an elastic restoring force acts as soon as it is stretched for the purpose of detachment.
  • the security label has after recovery, ie after stretching and subsequent relaxation, a length of L 2 with L 2 ⁇ L 1 and with L 2 ⁇ L 0 .
  • the elastic recovery capacity is preferably more than 30%, very preferably more than 50%.
  • the recovery is a function of the amount of the provision over the total expanded portion.
  • the stretched portion corresponds to the length of the stretched sample L 1 minus the original length L 0 .
  • the reset proportion corresponds to the length in the stretched state L 1 minus the length after return L 2 .
  • the elastic recovery (E R ) thus corresponds to the ability of a material or body to return to its original position (elastic deformation).
  • the elastic recovery (E R ) leaves determine the determination of the tensile set (ZVR) according to the following relationship:
  • the width of the security label in its projection surface is reduced in particular by a transverse curling of the carrier and thus of the entire security label.
  • the security label preferably forms a hollow cylinder.
  • the desired deformation, in particular the transverse curling occurs in particular at an elongation (stretching) by at least 100%, preferably by at least 500% and subsequent relaxation.
  • the curling takes place in a preferred embodiment such that the adhesive layer is substantially enveloped by carrier material, so have no or only a few adhesive areas facing outward.
  • the bonding of the adhesive layer to itself takes place in the interior of the security label, so that it is scarcely possible to disengage even with great effort. An adhesion of the so designed material and thus a reuse are thus largely prevented. Due to the fact that the adhesive layer, after curling, is essentially located inside the tube, staff entrusted with the detachment does not come into contact with tacky areas, which considerably improves the handling properties.
  • the label may also be designed such that it curls in such a way that the adhesive layer points essentially outwards.
  • This embodiment may be advantageous for easy removal of the label from the adhesive substrate, since the adhesive layer peels from the edge of the adhesive substrate in tension and thus can not come back or in any case only with a relatively small area in adhesive contact with the substrate.
  • the adhesive layer if it is tacky, is advantageously protected by a release liner until the time of bonding on the target substrate to be sealed.
  • the security label contains at least one optical feature, which may be applied or incorporated in particular by a printing process. For gluing, the label is removed manually or by a suitable mechanical dispensing device from the release liner and glued to the surface to be sealed.
  • the layer A has a higher tensile set than the layer B.
  • the layer A of the carrier has a
  • the layer B preferably has a maximum tensile set of maximum
  • Layers A, B should be as large as possible, a particularly strong deformation can be ensured by an appropriate design. At the same time, strong deformation also ensures that irreversibility is ensured even under additional external influences, such as high temperature.
  • the definition of the Young's modulus is explained, for example, in the Taschenbuch der Physik [H. Stöcker (ed.), Paperback of physics, 2nd ed., 1994, Harri German, Frankfurt]. Since the mechanical behavior of the security labels is of central importance for the function, FIG.
  • Regime 1 shows the typical course of a tensile / elongation curve, as it is qualitatively advantageous for a security label.
  • Regimes I and II are particularly important here.
  • Regime I defines the force required to stretch the security label in a noticeable way, while regime II describes to what extent and at what force the security label is stretchable before it ruptures ,
  • the curve in Regime III is characterized by the tear resistance of the security label.
  • Security labels of this first advantageous design have a Young's modulus less than about 100 MPa, preferably less than about 20 MPa.
  • the smallest possible Young's module has the advantage that a lower force is required to achieve the required for the residue-free peeling of the security label minimum elongation.
  • the security label has the highest possible Young's modulus.
  • the security label provides a high resistance to unintentional or autonomous opening of the closure and / or triggering the Clearö Stammsnachweises, which can occur for example by twisting of flaps or by vibration during transport.
  • This interpretation therefore proposes a solution for a security label, from which a high degree of robustness is expected.
  • a rather high Young's modulus is also associated with improved label handling in the process of sealing because the label tends to be stiffer and can be better applied to the bonding substrate. Especially with overhead bonding, increased stiffness proves to be advantageous.
  • the security label has a tear strength which is greater than the force required for detachment by stretching. Elongation occurs under less force than would be required for peel-off of the security tag. This ensures that the label also deforms during a possible peeling process and thus indicates the violation of the seal.
  • Safety label is clearly displayed that it has previously been detached from the bonding substrate.
  • the curling process not only displays the detachment process afterwards. Rather, it is also a reuse, for a
  • the security label is already at least partially, preferably completely removed from the secured object by stretching by the opening process itself at least on one side.
  • the opening process of Object such as a door
  • the security label is then particularly easy to detach from the second side, since the first side of the security label can serve as a handle for further stripping.
  • the security label has an adhesive layer, by means of which it can be fixed on the object to be marked.
  • An additional detection layer as provided, for example, in DE 10 2007 007 413 A1 and in US Pat. No. 6,372,341 B1, which irreversibly indicates a detachment attempt, is not required in the present security label, since the deformation of the label associated with the detachment and return process is already here provides clear evidence.
  • further optical features and / or detection layers may be provided to indicate the first opening in different ways. For example, it is advisable to provide a characteristic coloring so that a quick impression of the existence and condition of the seal can be obtained from afar. In addition, it is practicable to carry out a user-specific identification.
  • an optional detection layer may be a single layer, but it may also, as is known from the prior art, be composed of several layers.
  • a detection layer has an optical feature that irreversibly displays peeling, including partial peeling, of the security tag from the article.
  • the security tag is stretchable.
  • the carrier layer is designed to be stretchable. Stretchability of the security label also means that not all
  • stretchability is understood to mean the maximum stretch, the one
  • the security label can also optionally have predetermined breaking points at which it can be separated during initial opening in, for example, two parts. This makes it possible to open the object without much effort even when still glued security label.
  • the security label is divided in the process of opening itself at the breaking point in two parts, which still remain connected to the object still. There are thus no product shreds that can escape uncontrollably.
  • the residue-free removal of the security label of the object remains possible, however, since the two parts are each independently detachable by stripping the object.
  • the predetermined breaking point can be provided for example in the form of a mechanical pre-stress of the security label at this point or in a larger area of the security label, but it can also be formed by the fact that the security label itself at the appropriate location or in a larger area due to the layer structure or Accordingly, the chemical composition of the layers is designed to be correspondingly weaker, that is to say in this area does not have a high tear resistance, as is known from the prior art. In this sense, one can imagine, for example, a tapered region of the security label according to the invention as a predetermined breaking point.
  • a predetermined breaking point can be introduced into the security label by having a punched-on portion and / or a perforation.
  • the punching and / or perforation can be designed in various ways. It may for example be provided locally or extend over a larger area, it can be provided several punched and / or perforations and / or the shape of the stamping and / or perforations may be varied.
  • the region in which the predetermined breaking point is arranged is marked to ensure that the predetermined breaking point is located above the gap which forms when the article is opened, when the security label is being applied to the object to be marked so over the door slot.
  • Such an arrangement of the predetermined breaking point enables it to fulfill its function in the best possible way, since this point of the security label is subjected to the greatest load during the initial opening of the article.
  • the security label is designed in such a way that it can be removed from the object without any residue, essentially by stretching, only from the predetermined breaking point. This has the consequence that the security label can be removed without residue from the object after the opening of the article and thus after breaking the predetermined breaking point.
  • an external manipulation is made more difficult, independently of the actual primary opening feature of the deformation, which indicates such a manipulation.
  • Such a configuration can be achieved, for example, by a particularly strong bonding of the label to the object, in particular at the edges of the label.
  • the label may also be glued in a recess of the object to be marked, whereby a detachment, for example by means of a razor blade is significantly more difficult.
  • the predetermined breaking point is designed such that the security label can be separated into two parts with as little additional force as possible.
  • additional force indicates the force that must be applied in addition to the force required to open the article anyway, but this additional force is set to prevent inadvertent tearing of the security tag.
  • the adhesive layer advantageously consists of a PSA formulation.
  • PSAs may, in particular, be all linear, star-shaped, branched, grafted or otherwise shaped polymers, preferably homopolymers, statistical copolymers or block copolymers are used which have a molecular weight of at least 100,000 g / mol, preferably of at least 250,000 g / mol, very preferably of at least 500,000 g / mol.
  • at least a softening temperature is preferably less than 0 0 C, preferably less than - to understand 30 0 C.
  • the molar mass in this connection is the weight average of the molecular weight, as is obtainable, for example, via gel permeation chromatography analyzes.
  • softening temperature is understood as meaning the quasistatic glass transition temperature for amorphous systems and the melting temperature for semicrystalline systems, which can be determined, for example, by dynamic differential calorimetric measurements. If numerical values for softening temperatures are given, then in the case of amorphous systems these relate to the mid-point temperature of the glass step and, in the case of semicrystalline systems, to the temperature with maximum exotherm during the phase transition.
  • PSAs it is possible to use all PSAs known to the person skilled in the art, in particular acrylate, natural rubber, synthetic rubber or ethylene-vinyl acetate-based systems. Combinations of these systems can also be used according to the invention.
  • Monomers which are very preferably used in the context of the general structure (I) include acrylic and methacrylic acid esters having alkyl groups consisting of 4 to 18 C atoms. Specific examples of such compounds are without to limit by this list, n-butyl acrylate, n-pentyl acrylate, n-hexyl acrylate, n-heptyl acrylate, n-octyl acrylate, n-nonyl acrylate, lauryl acrylate, stearyl acrylate, stearyl methacrylate, their branched isomers, such as. For example, 2-ethylhexyl acrylate and iso-octyl acrylate and cyclic monomers such. B. cyclohexyl or norbornyl acrylate and isobornyl acrylate.
  • acrylic and methacrylic acid esters containing aromatic radicals such as. Phenyl acrylate, benzyl acrylate, benzoin acrylate, phenyl methacrylate, benzyl methacrylate or benzoin methacrylate.
  • vinyl monomers can be optionally used from the following groups: vinyl esters, vinyl ethers, vinyl halides, vinylidene halides, and vinyl compounds containing aromatic cycles or heterocycles in ⁇ -position.
  • examples of monomers which may be used according to the invention for the optionally usable vinyl monomers are: vinyl acetate, vinylformamide, vinylpyridine, ethylvinyl ether, 2-ethylhexyl vinyl ether, butylvinyl ether, vinyl chloride, vinylidene chloride, acrylonitrile, styrene and ⁇ -methylstyrene.
  • monomers which can be used according to the invention are glycidyl methacrylate, glycidyl acrylate, allyl glycidyl ether, 2-hydroxyethyl methacrylate, 2-hydroxyethyl acrylate, 3
  • Crotonic acid and its esters maleic acid and its esters, fumaric acid and their
  • Esters maleic anhydride, methacrylamide and N-alkylated derivatives, acrylamide and N-alkylated derivatives, N-methylolmethacrylamide, N-methylolacrylamide, vinyl alcohol, 2-
  • rubber or synthetic rubber as starting material for the PSA, further variations are possible, be it from the group of natural rubbers or synthetic rubbers or be it from any blend of natural rubbers and / or synthetic rubbers, wherein the natural rubber or natural rubbers in principle from all available qualities such as For example, crepe, RSS, ADS, TSR or CV types, depending on the required level of purity and viscosity, and the synthetic rubber or synthetic rubbers from the group of random copolymerized styrene-butadiene- Rubbers (SBR), butadiene rubbers (BR), synthetic polyisoprenes (IR), butyl rubbers (NR), halogenated butyl rubbers (XIIR), acrylate rubbers (ACM), ethylene vinyl acetate copolymers ( EVA) and the polyurethanes and / or their blends can be selected.
  • SBR random copolymerized styrene-butadiene- Rubbers
  • BR butadiene rubbers
  • IR butyl rubber
  • rubbers may preferably be added with thermoplastic elastomers having a weight fraction of from 10 to 50% by weight, based on the total elastomer content.
  • thermoplastic elastomers having a weight fraction of from 10 to 50% by weight, based on the total elastomer content.
  • SIS polystyrene-polyisoprene-polystyrene
  • SBS polystyrene-polybutadiene-polystyrene
  • block copolymers are also advantageously usable as base materials for adhesive layers.
  • individual polymer blocks are covalently linked to one another.
  • the block linkage may be in a linear form, but also in a star or graft copolymer variant.
  • An example of a usable advantageous block copolymer is a linear triblock copolymer having two terminal blocks having a softening temperature of at least 40 0 C, preferably at least 70 0 C and have the center block a softening temperature of at most 0 0 C, preferably not more than -30 0 C.
  • Higher block copolymers, such as tetrablock copolymers can also be used.
  • polymer blocks of the same or different type are contained in the block copolymer, which have a softening temperature of at least 40 ° C., preferably at least 70 ° C., and which have at least one polymer block with a softening temperature of at most 0 ° C., preferably at most. 30 0 C are separated from each other in the polymer chain.
  • polymer blocks are polyethers such as.
  • polybutadiene or polyisoprene hydrogenated polydienes such.
  • polyethylene butylene or polyethylene propylene polyester, such as.
  • Polyethylene terephthalate Polybutandioladipat or Polyhexandioladipat, polycarbonate, polycaprolactone, polymer blocks of vinyl aromatic monomers, such as.
  • polystyrene or poly- ⁇ -methyl styrene polyalkyl vinyl ethers, polyvinyl acetate, polymer blocks ⁇ , ß-unsaturated esters such as in particular acrylates or methacrylates.
  • the person skilled in the corresponding softening temperatures are known. Alternatively, he suggests it, for example, in the Polymer Handbook [J. Brandrup, EH Immergut, EA Grulke (ed.), Polymer Handbook, 4th Ed. 1999, Wiley, New York].
  • Polymer blocks may be composed of copolymers.
  • tackifying resins which can be used as an optional ingredient, all previously known adhesive resins described in the literature can be used without exception. Mention may be made representative of the rosins, their disproportionated, hydrogenated, polymerized, esterified derivatives and salts, the aliphatic and aromatic hydrocarbon resins, terpene resins and terpene phenolic resins. Any combination of these and other resins can be used to adjust the properties of the resulting adhesive as desired.
  • plasticizers which can likewise be used as an option, it is possible to use all softening substances known from self-adhesive technology. These include, among others, the paraffinic and naphthenic oils, (functionalized) oligomers such as oligobutadienes and -isoprenes, liquid nitrile rubbers, liquid terpene resins, vegetable and animal fats and oils, phthalates and functionalized acrylates.
  • Pressure-sensitive adhesives as stated above may also contain further constituents, such as rheologically active additives, catalysts, initiators, stabilizers, compatibilizers, coupling reagents, crosslinkers, antioxidants, other anti-aging agents, light stabilizers, flame retardants, pigments, dyes, fillers and / or blowing agents, and optionally solvents contain.
  • the two layers A, B of the carrier are based in particular on similar polymers.
  • they preferably differ only in their overall composition, but not in respect of the main constituent.
  • Such a design is particularly advantageous in terms of manufacturing technology, since the two layers can be processed, for example, in the same temperature ranges.
  • a similar design of the two layers A, B in terms of their components also simplifies the adaptation to the requirements to be met with regard to environmental influences (temperature stability, aging resistance, etc.).
  • polyolefins are particularly suitable as a polymeric base for the layer A and / or the layer B, although other polymers can also be used as the basis of the layers.
  • the mechanical properties of the layers A and B are predetermined so that, when stretched beyond the yield point (yield point, at about 10% elongation), the layer B of the carrier is largely elastic but the layer A is predominantly plastically deformed. Leaving the film assembly to relax, that is relax, deforms three-dimensionally, that is, the composite becomes longer, thicker and narrower than before the stress of stretching.
  • the layer B should be significantly thicker than the layer A.
  • the thickness of the layer B should be at least 3 times, preferably ⁇ times the thickness of the layer A.
  • At least one layer, in particular the layer B, of the carrier is foamed.
  • the foaming allows a relatively large thickness of the layer, without an additional use of material would be required. However, since only the thickness is relevant for adjusting the specific bending modulus of a layer, an increase in the specific flexural modulus can be achieved in a cost-effective manner by foaming.
  • the layer B can be self-adhesive due to their high elasticity and this property can lead to blocking, it is advisable to apply a not susceptible to blocking layer C. Under blocking is understood here, if the wound carrier is difficult or impossible, if necessary, only in places, pull off.
  • An additional layer C which in particular is not self-adhesive, thus improves the processability of the carrier in the production process.
  • the layer C is preferably formed as well as the layers A, B polymer-based. Furthermore, the layer C does not have to be directly connected to the layer B, but further layers may be provided between the layer B and the layer C. However, a preferred arrangement of the carrier as compact as possible is a direct arrangement of the layer C on the layer B, so that a layer sequence A, B, C results.
  • An additional layer C is also particularly advantageous when it is arranged on the side of the layer B opposite the layer A.
  • the layer B is thus encapsulated from both sides and protected from damage and contamination.
  • the third layer C also facilitates precise adjustment of the desired deformation and / or other mechanical properties of the carrier. If the layers A and C consist of the identical or similar material, ie if they are based on similar polymers and, moreover, have the same thickness, then the preferred three-dimensionally shaped body is not formed, but a flat film with a rough appearance is formed Surface similar to that of a finely creped paper. Therefore, the layers A and C should have different composition or in any case a different thickness for the same composition.
  • the thickness of the layer A should be at least 1.5 times, preferably at least 2.0 times, the thickness of the layer C. If the layers A and C consist of a different material, a three-dimensionally shaped body can be formed even with the same thickness of the layers A and C. However, this depends on the specific flexural modulus E s of the respective layers.
  • the specific flexural modulus is defined by the flexural modulus of the material E 6 of the respective layer multiplied by the thickness of the respective layer.
  • the ratio of the specific bending modulus E s of the layer A to the specific bending modulus E s of the layer B should be greater than 20, preferably greater than 30.
  • the layer C should also have a relatively high tensile set, in particular a tensile set of at least 60%, preferably at least 70%, more preferably at least 90%, to enhance the plastic deformation of the sheet assembly.
  • the Switzerlandzierverformungsrest the layer A or C can be adjusted by the addition of hydrocarbon resins, such as those used for so-called twist packaging films (candy packaging), as desired and improved.
  • raw materials of layers A and C are thermoplastic polyolefins, polyamides, polystyrenes and polyesters.
  • Preferred raw materials are polyolefins such as ethylene vinyl acetate (EVA), ethylene acrylate (EA), ethylene methacrylate (EMA), low density polyethylene (PE-LD), linear low density polyethylene (PE-LLD), very low density linear polyethylene (PE-VLD), Polypropylene homopolymer (PP-H), polypropylene copolymer (PP-C) (impact or random).
  • EVA ethylene vinyl acetate
  • EA ethylene acrylate
  • EMA ethylene methacrylate
  • PE-LD low density polyethylene
  • PE-LLD linear low density polyethylene
  • PE-VLD very low density linear polyethylene
  • PP-H Polypropylene homopolymer
  • PP-C polypropylene copolymer (PP-C) (impact or random).
  • Polymers of layers A and / or C preferably have a flexural modulus of more than 1300 MPa, particularly preferably more than 1800 MPa, and are preferably in each case at least 50 wt .-%, more preferably at least 90 wt .-% in the layer A or C included.
  • raw materials of layer B are thermoplastic elastomers based on polyolefins TPO, polyamides TPA, polyurethanes TPU, styrene block copolymers TPS and polyesters TPC.
  • Preferred raw materials are polyolefin copolymers such as ethylene vinyl acetate EVA, ethylene acrylate EA, soft polyethylene elastomers such as Affinity TM, Engage TM, Exact TM, Tafmer TM, soft polypropylene copolymers such as Vistamaxx TM, Randify low melting point Versify TM, and elastomeric heterophasic polyolefins (for example with block structure) such as Infuse TM, Hifax TM, Adflex TM or Softell TM.
  • the polymer of layer B preferably has a flexural modulus of less than 1000 MPa, more preferably less than 100 MPa, and is preferably at least 50% by weight, more preferably at least 90% by weight, in the layer.
  • the support is designed so that it exerts a force perpendicular to the cross-section at 10% elongation, ie possibly in the direction of extrusion of the extrusion line (MD) and transversely to the running direction (CD) of at most 10 N / cm, preferably at most 5 N / cm.
  • the elongation at break is preferably at least 100%, more preferably 500%.
  • the carrier is preferably designed such that its total thickness is about 20 ⁇ m to about 150 ⁇ m, preferably about 40 ⁇ m to about 80 ⁇ m.
  • the support in particular consisting of the two layers A, B, can be produced by calendering with subsequent lamination or, preferably, by coextrusion.
  • the carrier is preferably produced in the flat film extrusion process (T-die, Cast, cast film).
  • the carrier is essentially unstretched so that it can have a sufficient elasticity, ie it has not been forcibly oriented in a semicrystalline state in one or more directions. An orientation in the molten state, as they occur in the above-mentioned manufacturing processes, is not a (controlled) stretching (stretching).
  • the carrier may contain in one or more of its layers conventional additives such as fillers, pigments, impact modifiers, anti-aging, antiblocking, foaming (blowing), sunscreening, nucleating or lubricating agents.
  • conventional additives such as fillers, pigments, impact modifiers, anti-aging, antiblocking, foaming (blowing), sunscreening, nucleating or lubricating agents.
  • the carrier can also by embossing, corona treatment, coating such. B. primer or printing to be modified.
  • the security tags may also optionally include one or more further layers having one or more optical features that may or may not change their appearance when stretched. It is preferred if such a layer represents the uppermost layer in the label composite. It is also conceivable that such a layer is incorporated between two layers forming the carrier layer. It can be realized as printing, as well as multiple printing, wherein individual printing elements over the entire surface can be partially configured, or as an embossing film such as a hot stamping foil. Optical features that change their appearance under stretching can also be incorporated in different layers in the security label. It is also possible that an optical feature is composed of individual features located in different layers. With regard to further possible optical features and effects, reference is also made to DE 10 2007 007 413.
  • a stretching-related optical effect resulting from the interplay of different optical phenomena from different layers of the label composite is particularly preferred.
  • a layer below the carrier be designed black.
  • the support material In the unstretched state, the support material is substantially transparent and preferably colorless.
  • On the outside of the carrier there is a further color layer, which, however, is not or not clearly recognizable as such due to the translucent black layer in the bonded and unstretched state.
  • the carrier which is substantially transparent in the unstretched state, becomes cloudy, so that the black color layer is no longer completely visible therethrough.
  • optical feature serves to indicate a detachment of the security label from the object, even already a partial detachment irreversible.
  • a change in appearance upon detachment of the security label, so that the appearance after first bonding differs from the appearance after detachment under stretching.
  • Such a change in appearance may be, for example, that the appearance is glossy at first, and changes to a dull appearance when peeled off.
  • Such conversion can be done, for example, by stretching with only partial recovery.
  • the optical feature is designed such that after a peel under stretching a different colored appearance is visible. This can be achieved, for example, in that different areas of the security label initially have different colors, which then mix with one another during stretching.
  • the optical feature may be formed as a hologram, in particular as a stamping hologram.
  • the hologram area will increase the contrast and / or the brilliance of the hologram as compared to the initial bonding. As a result, a detachment under stretching without aids is recognizable in this case.
  • the optical feature is designed as a graphic pattern.
  • the graphic pattern is noticeably different after stretching and thus serves as an additional first-opening indicator.
  • the graphic pattern may have, for example, lines which have a different course and / or a different orientation after being stretched.
  • combinations of a plurality of optical features which change recognizably under elongation and are no longer in their original appearance after detachment of the security label may also be advantageously used.
  • the security label can be designed such that it has a storage layer into which information can be introduced.
  • the storage layer may be an additional layer.
  • the storage layer can be replaced, for example, by another Layer, how a carrier layer of the security label are formed.
  • the introduction of the information can be done for example by printing the storage layer, embossing, writing by means of a laser or the like. Printing by inkjet and / or thermal transfer is also possible.
  • the security labels preferably have one or more fields which are provided for individualization.
  • individualization serial numbers, times, locations, manufacturer information and other individual details for the respective label or the product to be protected are conceivable. These can be in plain text or in encrypted form. This can be realized, for example, as a barcode or 2D code.
  • additional layers may be used, which may be selected to add additional functionality to the security label, but will not substantially change the tensile / elongation behavior of the label.
  • optionally usable layers may be primer, release or barrier layers. Especially primer and release layers can be used in full-surface or partial form.
  • the layer thickness of the adhesive layer of the security labels is preferably between 5 ⁇ m and 1000 ⁇ m, more preferably between 15 ⁇ m and 500 ⁇ m.
  • the release film consists of a carrier film, which is equipped on one or both sides with a release liner, which in turn is preferably based on silicone.
  • the release lacquers are preferably graduated, ie the release values differ on the upper and lower sides.
  • polyolefins are used as carrier material for the release film.
  • Preferred polyolefins are prepared from ethylene, propylene, butylene and / or hexylene, it being possible in each case for the pure monomers to be polymerized or for mixtures of the monomers mentioned to be copolymerized. Polyesters in particular such polyethylene terephthalate-based film liners are also advantageously used. Furthermore, various papers, optionally also in combination with a stabilizing extrusion coating, come as a carrier material for release materials in question. All mentioned release carriers obtain their anti-adhesive properties through one or more coating courses, for example with a silicone-based release. The order can be done on one or both sides.
  • the total thickness of the security labels without liner should be between 25 ⁇ m and 1500 ⁇ m, preferably between 35 ⁇ m and 500 ⁇ m. It is advantageous if the adhesive layer and the layer thickness of the carrier are similar in magnitude (variant A: layer thickness ratio of adhesive layer to carrier layer of about 25:75 to about 75:25). Alternatively, the layer thickness of the adhesive layer may also be formed substantially smaller than the layer thickness of the carrier (variant B: about 10:90 to about 25:75). But other layer thickness ratios are possible. In variant A, the adhesive layer and the carrier are preferably selected such that they both essentially correspond to the criteria of the mechanical properties. In variant B, the mechanical properties of the carrier contribute mainly to the mechanical properties of the label. The adhesive layer in this case need not have a particularly high ductility or tear resistance.
  • the security label is also at temperatures up to about -50 0 C, preferably used to about -30 0 C, thus retaining its essential properties.
  • An upper temperature limit for such security labels is usually defined by the cohesion of the adhesive layer and / or any carrier layers.
  • the security label is preferably designed such that it can also be used at temperatures up to about 100 ° C., preferably up to about 60 ° C.
  • the security label is particularly suitable for sealing doors, such as folding doors, sliding doors, hinged doors, windows, containers with lids or the like.
  • it is designed so that it can be used for sealing of all types of transport, so also holds the corresponding weather conditions occurring in this application field, and the Opening an externally sealed door from the inside allows.
  • Fig. 3 is a schematic representation of a side view of the invention
  • FIG. 4 shows the security label from FIG. 3 when the door is first opened
  • FIG. 5 shows the stretched security label according to FIG. 3 during the detachment process
  • Fig. 6 shows the security label of FIG. 3 after stretching and return in the rolled-up state.
  • FIG. 1 shows an exemplary course of a tensile / elongation curve of a security label 1.
  • Other tensile / elongation profiles are also conceivable.
  • the tensile force increases with increasing elongation approximately linearly, that is, with increasing force, the security label 1 is continuously stretched.
  • the tensile force required for further elongation of the security label 1 is almost constant. This area is of particular importance for the maximum extensibility of the security label 1.
  • a growing tensile force is then again required for a further expansion of the security label 1.
  • Fig. 2 is a schematic representation of the peel angle, ie the angle at which a security label 1 according to the invention without leaving any residue from the adhesive substrate 2 (any object) is removed, shown for better understanding.
  • the residue-free removal of the article 2 by stretching the security label 1 is in a preferred embodiment, as shown, at an angle between 0 ° and 90 ° possible.
  • the known from the prior art adhesive tapes do not allow such a large angle for residue-free detachment in the rule, but usually only between 0 ° and up to 45 °, whereby the handling of the security label is unnecessarily difficult when removing.
  • Fig. 3 is a schematic representation of a side view of a security label 1 is shown, which is glued on a door 2.
  • the security label 1 serves as Thompsonö Stammsnach Stamm, it therefore indicates whether the door 2, which here consists of two mutually displaceable wings 2a, 2b, after sealing with the security label 1 has already been opened or not.
  • the security label 1 initially has an adhesive layer 3, with which it is applied to the door wings 2a, 2b.
  • the adhesive layer 3 is arranged on a support 4, which here serves as a structure-forming layer of the security label 1 and essentially determines the physical properties of the security label 1.
  • the carrier 4 has the two layers A, B on. Both layers are polyolefin-based.
  • the layer A has a tensile set of more than 60%, whereas the set B of the layer B is less than 40%.
  • An optional optical feature layer 5 is then arranged on the support 4, which may be selected such that it irreversibly indicates a detachment attempt of the security label from the door 2 via an optical feature.
  • a protective layer may additionally be provided on the detection layer or further functional layers. It can also be provided that several functions of only one layer are provided, the number of necessary layers is therefore variable. With regard to the design possibilities of the layer structure and its composition, reference is made to the general description.
  • the security label 1 is stretched during the opening process.
  • the security label 1 begins under stretching at least one of the two leaves 2a, 2b, here due to the direction of movement actually only from the door 2a, too to solve.
  • the security tag 1 is completely removed from one door 2a, while it still adheres to the other door 2b (FIG. 5). Due to the elastic resilience, the security label does not remain in this state. The stretched part relaxes spontaneously. Meanwhile, the previously stretched part of the label rolls in transversely.
  • the detached and rolled-up part of the security label 1 from the door 2 a can now serve as a handle for further removal of the security label 1 from the door 2 b.
  • the removal of the door leaf 2b is then also under stretching of the security label 1 by being pulled under a suitable peel-off angle (FIG. 6).
  • the security label 1 Before stretching and in the bonded state (left half of the security label 1), the security label 1 has its original width. The label or this label part is in planar form. After stretching and after elastic recovery (right half of the security label 1), the projection of the label width is reduced by rolling. At the same time, the curled state is clearly distinguishable from the shape of the intact seal. Optionally, optical features can still support the difference between intact and detached seals.
  • a siliconized release liner was coated with 12 ⁇ m of a styrenic block copolymer-based pressure-sensitive adhesive containing 30% of a polyterpene resin.
  • a stretchable, non-tacky carrier composed of three layers bonded together by flat film extrusion based on different types of polypropylene
  • the measurements are made at test conditions of 23 ⁇ 1 0 C and 50 ⁇ 5% relative humidity. Humidity carried out.
  • the flexural modulus was determined according to ASTM D 790 (2% Secant).
  • the tensile elongation behavior of the adhesive tape was determined on specimens of type 2 (rectangular 150 mm long and, if possible, 15 mm wide test strips) according to DIN EN ISO 527-3 / 2/300 with a test speed of 300 mm / min, a clamping length of 100 mm and a Pre-load of 0.3 N / cm was determined, with patterns for the determination of the data was cut with sharp blades.
  • the tensile elongation behavior was measured in the machine direction (MD). The force is expressed in N / stripe width and the elongation at break in%.
  • the tensile set (plastic deformation at a constant elongation) is determined on the basis of DIN ISO 2285, the test speed 100 mm / min and
  • ZVR Ll ⁇ 'L ° XlOO L 1 - L 0
  • L 0 indicates the clamping length
  • L 1 the extended measuring length
  • L 2 the measuring length after stretching and subsequent relaxation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Adhesive Tapes (AREA)

Abstract

L'invention concerne une étiquette de sécurité (1) pour une utilisation en tant que preuve de première ouverture, comprenant un support (4), le support présentant au moins une première couche A et une seconde couche B et comprenant une couche de colle (3) destinée à être appliquée sur un objet (2) à sécuriser, la couche de colle étant disposée en dessous du support, un marquage étant prévu qui indique de manière irréversible une tentative de décollage de l'objet, et l'objet étant réalisé de manière extensible. Il est recommandé que les deux couches A, B présentent un reliquat de déformation par traction différent l'un de l'autre, que l'étiquette de sécurité soit déformée de manière tridimensionnelle après une extension et un relâchement consécutif et que la déformation constitue la caractéristique.
EP09719044.1A 2008-03-11 2009-03-02 Étiquette de sécurité Active EP2265509B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008013690A DE102008013690A1 (de) 2008-03-11 2008-03-11 Sicherheitsetikett
PCT/EP2009/052444 WO2009112390A1 (fr) 2008-03-11 2009-03-02 Étiquette de sécurité

Publications (2)

Publication Number Publication Date
EP2265509A1 true EP2265509A1 (fr) 2010-12-29
EP2265509B1 EP2265509B1 (fr) 2013-07-10

Family

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EP09719044.1A Active EP2265509B1 (fr) 2008-03-11 2009-03-02 Étiquette de sécurité

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Country Link
EP (1) EP2265509B1 (fr)
DE (1) DE102008013690A1 (fr)
WO (1) WO2009112390A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008033322A1 (de) 2008-07-16 2010-01-21 Tesa Se Verfahren und Verwendung von Klebestreifen zur Abdeckung oder Versiegelung optisch hochwertiger Oberflächen
DE102008033323A1 (de) 2008-07-16 2010-01-21 Tesa Se Sicherheitsetikett
WO2015036045A1 (fr) * 2013-09-13 2015-03-19 CSEM Centre Suisse d'Electronique et de Microtechnique SA - Recherche et Développement Scellé d'inviolabilité à guide de lumière

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Publication number Priority date Publication date Assignee Title
US4024312A (en) 1976-06-23 1977-05-17 Johnson & Johnson Pressure-sensitive adhesive tape having extensible and elastic backing composed of a block copolymer
US4608288A (en) * 1984-08-21 1986-08-26 Joachim Dudzik Tamper proof label or seal
US4652473A (en) 1984-12-10 1987-03-24 Minnesota Mining And Manufacturing Company Tamper-resistant packaging tape
TW215105B (fr) 1990-12-20 1993-10-21 Minnesota Mining & Mfg
WO1997044769A1 (fr) 1996-05-20 1997-11-27 Minnesota Mining And Manufacturing Company Feuille multicouche antivol
US6372341B1 (en) 1998-04-27 2002-04-16 3M Innovative Properties Company Tampa-indicating article for reusable substrates
FR2827417B1 (fr) * 2001-07-13 2003-11-28 Francois Trantoul Sceau de garantie de non-utilisation d'une ouverture forme d'un film transfert a portion intermediaire etirable, procede de pose et produit obtenu
US20040021312A1 (en) * 2002-08-02 2004-02-05 Dietz Timothy M. Security label
DE102004051279A1 (de) * 2004-10-21 2006-04-27 Merck Patent Gmbh Sicherheitssiegel für Behältnisse
DE202006010886U1 (de) * 2005-03-15 2006-09-07 Henkel Kgaa Klebeband mit einem mehrschichtigen Aufbau
US20060246802A1 (en) * 2005-04-29 2006-11-02 Hughes Janis W Color change laminate material
DE102007007413A1 (de) 2007-02-12 2008-08-14 Tesa Ag Sicherheitsetikett

Non-Patent Citations (1)

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Title
See references of WO2009112390A1 *

Also Published As

Publication number Publication date
EP2265509B1 (fr) 2013-07-10
DE102008013690A1 (de) 2009-09-17
WO2009112390A1 (fr) 2009-09-17

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