DE102014118353A1 - Arrangement for a humidity sensor and method for producing the arrangement for a humidity sensor - Google Patents

Arrangement for a humidity sensor and method for producing the arrangement for a humidity sensor

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Publication number
DE102014118353A1
DE102014118353A1 DE102014118353.3A DE102014118353A DE102014118353A1 DE 102014118353 A1 DE102014118353 A1 DE 102014118353A1 DE 102014118353 A DE102014118353 A DE 102014118353A DE 102014118353 A1 DE102014118353 A1 DE 102014118353A1
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DE
Germany
Prior art keywords
layer
arrangement
example
state
surface
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.)
Pending
Application number
DE102014118353.3A
Other languages
German (de)
Inventor
Julia Klock
Pierre Göppert
Thomas Samuel
Jan Rogge
Jurij Weiss
Kai Schnapauff
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.)
Schreiner Group GmbH and Co KG
Original Assignee
Schreiner Group GmbH and Co KG
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 Schreiner Group GmbH and Co KG filed Critical Schreiner Group GmbH and Co KG
Priority to DE102014118353.3A priority Critical patent/DE102014118353A1/en
Publication of DE102014118353A1 publication Critical patent/DE102014118353A1/en
Application status is Pending legal-status Critical

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00Investigating or analysing materials by the use of electric, electro-chemical, or magnetic means
    • G01N27/02Investigating or analysing materials by the use of electric, electro-chemical, or magnetic means by investigating the impedance of the material
    • G01N27/04Investigating or analysing materials by the use of electric, electro-chemical, or magnetic means by investigating the impedance of the material by investigating resistance
    • G01N27/12Investigating or analysing materials by the use of electric, electro-chemical, or magnetic means by investigating the impedance of the material by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
    • G01N27/121Investigating or analysing materials by the use of electric, electro-chemical, or magnetic means by investigating the impedance of the material by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid for determining moisture content, e.g. humidity, of the fluid
    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00Alarms responsive to a single specified undesired or abnormal operating condition and not elsewhere provided for
    • G08B21/18Status alarms
    • G08B21/20Status alarms responsive to moisture

Abstract

An arrangement (1) for a moisture sensor comprises a substrate layer (3) having a surface (5) and a first layer (10) arranged on the surface (5) of the substrate layer (3) and having a surface (11) extending from the substrate layer (3) is turned away. The arrangement (1) further comprises a second layer (20), which has electrical conductivity, arranged on the surface (11) of the first layer (10). The first layer (10) is configured to have a first volume in a first state and, in a second state, when in contact with moisture, to have a second volume that is greater than the first volume. The first layer (10) and the second layer (20) are arranged on top of each other such that the second layer (20) is continuous in the first state and interrupted in the second state.

Description

  • The present invention relates to an arrangement for a humidity sensor and to a method for producing the arrangement for a humidity sensor. The arrangement and method may be adapted to provide tamper protection for a security tag.
  • Security labels can be used for authorization or proof of origin and can be used wherever it is necessary to verify items and / or identify persons. This applies, for example, vehicles that want to enter restricted areas, or, for example, containers whose contents are to be protected. In this context, security labels have, for example, electronic components, such as RFID transponders, whose operation is to be protected against manipulation.
  • It is an object to provide an assembly and method of making the assembly that is capable of facilitating tamper protection for security tags in a simple manner.
  • According to a first aspect of the invention, an arrangement for a security label comprises a substrate layer having a surface and a first layer arranged on the surface of the substrate layer and having a surface which faces away from the substrate layer. The assembly further comprises a second layer disposed on the surface of the first layer and having electrical conductivity. In this case, the first layer is formed such that it has a first volume in a first state and in a second state, when in contact with moisture, has a second volume that is greater than the first volume. The first layer and the second layer are arranged one on the other so that the second layer is continuous in the first state and interrupted in the second state.
  • In this way, an arrangement for a label with humidity sensor is realized in order to detect moisture effects can. In one application of the label can thus easily detected a detachment of the label by means of moisture and thereby a tamper protection against improper use of the label are made possible.
  • The second layer has an electrical conductivity as a function of its material and is coupled, for example, to one or more electrical components, so that a detectability of a detachment test by means of moisture is possible in a simple manner by means of the arrangement described. The substrate layer serves, for example, as a carrier material and may be a PET film.
  • In the case of a manipulation attempt by means of moisture, in particular water or water vapor, the second layer breaks, so that the second layer is no longer continuous. Such a manipulation attempt thus leads to irreversible destruction of the second layer at one or more locations, whereby an electrical conduction by means of the second layer in the second state is no longer possible.
  • If the second layer is, for example, part of a conductor track of an electrical component, breaking up of the second layer in the second state leads to a signal change which can be detected and evaluated in a simple manner. Optionally, breaking up the second layer also leads to a complete loss of function of the electrical component, so that misuse of the arrangement or an associated security label comprising the arrangement is prevented or at least made more difficult.
  • By way of example, the arrangement, or more precisely the second layer of the arrangement, is electrically connected to an RFID transponder, which in each case receives and / or transmits a signal during operation. In the first state of the arrangement, the second electrically conductive layer is continuous and functional, and thus the desired functionality of the RFID transponder with regard to the reception and transmission of signals is also given.
  • However, when the assembly, or the first layer of the assembly, contacts moisture, the first layer will swell and, compared to the first volume in the first state, will have the increased second volume in the second state. In this second state of the arrangement, the volume of the first layer has increased in such a way that the second layer arranged above it is interrupted and no longer functional. In this context, the second layer is irreversibly destroyed, so that drying out the first layer, for example, when the absorbed moisture leaves the first layer, does not lead to the arrangement in the first state again.
  • In principle, swellable materials can be used for the first layer, which change their volume upon contact with moisture. Among other things, contact with moisture also includes contact with aqueous or organic media, such as, for example, acids, bases and salt solutions or alkanes, Alcohols, aldehydes, carboxylic acids, esters and halogenated hydrocarbons.
  • For example, the second volume of the first layer in the second state is at least 10% larger than the first volume of the first layer in the first state. For example, in other embodiments, the second volume of the first layer in the second state is greater than 50% greater than the first volume of the first layer in the first state. In sections, the second volume of the first layer in the swollen second state may also be greater than 100% to 400% greater than the respective portion of the first volume of the first layer in the unswollen first state.
  • Thus, an operation of the RFID transponder is no longer available or at least no longer corresponds to a previous operating state. Receiving and transmitting signals by means of the RFID transponder is changed due to exposure to moisture. Thus, a cost-effective manipulation protection for security labels can be realized, which makes, among other things, a manipulation of electronic components easily recognizable.
  • The first layer and the second layer may be printed on the substrate layer.
  • In this way, an arrangement is realized which is simple and inexpensive to produce. By way of example, the first layer and the second layer are printed on the surface of the substrate layer by means of a screen-printing method, thus allowing a particularly simple production process of the described arrangement.
  • The first layer may comprise a gelling agent and / or a varnish which and / or which swells in contact with moisture in the second state.
  • Gelling agents are substances which, inter alia, have the property of swelling in contact with water or binding water and thereby lead to gelation. Gelling agents are, for example, admixed with a lacquer or a printing ink and thus enable the first layer to be imprinted, which contains the described property, to swell in contact with moisture. Among other things, a quantity and quality of the swelling of the first layer depends on, for example, a selection and a proportion of the gelling agent in a lacquer system. An example of a lacquer in this context is the absorption lacquer 972 UV 0270 from RUCO. Further examples are UVS 904 from Marabu and Cx / E50 from Coates Screen Inks.
  • The first layer may comprise a superabsorbent that swells in contact with moisture in the second state.
  • Superabsorbents are special gelling agents and comprise superabsorbent polymer substances which are, for example, pulverulent and, inter alia because of their polymeric network structure, have the property of absorbing a relatively large amount of moisture and storing it over a relatively long period of time compared to other gelling agents. In this case, the starting material of a superabsorber is usually admixed with a lacquer or an ink in order to produce a printable paste.
  • For example, due to the absorption of moisture when a superabsorbent layer comes in contact with moisture, its volume increases many times and it forms a hydrogel, which usually has a fissured structure. An example of a superabsorbent or a superabsorbent polymer substance is the gelling agent Z1069 from Evonik Industries AG.
  • According to a further embodiment of the first aspect, the second layer comprises a silver conductive paste, which has electrical conductivity.
  • The silver conductive paste is a possible component of the second layer and usually comprises resins, solvents and electrically conductive particles. In this way, for example, depending on a predetermined concentration of Silberleitpaste a predetermined electrical conductivity is realized and allows printing of the second layer.
  • Alternatively or additionally, however, the second layer may also include other electrically conductive particles, such as copper or graphite, such that the second layer comprises a copper conductive paste or a graphite conductive paste. In this case, the electrically conductive particles are usually plate-shaped, because such a configuration, for example, realized a higher electrical conductivity and lower resistances than, for example, spherical particles.
  • In connection with the arrangement described, it is useful, for example, to use fine-grained conductive paints or conductive pastes with plate-shaped, electrically conductive particles which, on swelling the first layer in the second state, have a finer fracture behavior than coarse-grained conductive inks and conductive pastes. An example of a silver conductive paste is described by the abbreviation AG 1007.
  • The second layer is for example strip-shaped.
  • In this context, the term strip-shaped a geometric shape of the second layer is described in which a spatial dimension is designed significantly larger than the other two. This means, for example, with respect to a view of the second layer, that a length of the second layer is greater than a width of the second layer. By way of example, a value of the length is at least ten times as great as a value of the width, which in the plan view realizes a strip-shaped configuration of the second layer.
  • A strip-shaped second layer serves, for example, as a conductor track, for example, an antenna or a circuit board, and allows a space-saving implementation in an associated electrical component. For example, the second layer is printed in strips on the first layer, the first layer in turn being designed flat.
  • For example, the second layer is meandered and covers a larger portion of the first layer than would be the case if the second layer ran as a single stripe from one edge to the other edge of the first layer. In this way, it is possible, for example, to increase an activation speed of the arrangement, in that the second layer covers a larger part of the swellable first layer with respect to its length. In addition, a strip-shaped configuration of the second layer may be advantageous for each coupled electrical component and a type of application, for example, include signal transmissions in the high frequency range.
  • The first layer and the second layer may be formed flat.
  • In this way, an increased area is protected, for example, against a moisture detachment attempt and a non-standard use of a security tag. In this case, a length and a width of the respective layer may be approximately equal. For example, a length to width ratio of the respective layer is 2: 1 or even 1: 3. A planar design of the first and second layer thus makes it possible to provide a larger electrically conductive surface for a humidity sensor and thus to sensitize a larger area of a label with respect to exposure to moisture.
  • If, for example, the second layer of the described arrangement is printed flat, it is useful in this connection to form the first layer evenly, since otherwise the second layer completely overlaps the first layer, for example. In such a case, the second layer may then only be broken up locally by swelling of the first layer arranged underneath, so that in the second state, a continuously electrically conductive part of the second layer may then optionally be present apart from the first layer. In addition, a surface configuration of the first and second layer may be useful for each coupled electrical component and a type of application, for example, include signal transmission in the high frequency range.
  • By way of example, the second layer is a section of a conductor track of an electrical component.
  • In this way, as already described, it is possible to protect the respective electrical component by means of the arrangement against manipulation by means of moisture. The interruption of the second layer resulting in the second state is irreversible and leads to a changed mode of operation of the electrical component or even to its complete loss of function.
  • An example of an electrical component is an RFID transponder with a loop or dipole antenna, which can be protected with the described arrangement against misuse.
  • The second layer may be a portion of a trace of an antenna of a transponder.
  • This configuration of the arrangement is particularly advantageous for antennas or antenna structures in which one or more interconnects are electrically coupled to one or more second layers of the array.
  • For example, the antenna is a loop antenna or a dipole antenna.
  • The second layer may also be a portion of a trace of an RFID transponder.
  • For example, a void structure is disposed between the surface of the substrate layer and the first layer.
  • In this context, a void structure offers additional protection against tampering, which is realized by means of two or more structures of different adhesive strength. For example, a more adhesive structure is implemented in the form of a lettering in the void structure, while other sections of the void structure are weaker are adhesive. When the void structure or a security tag comprising the void structure is applied to an article to be secured, if the security tag is released, the more adhesive lettering will stick to the article while the weaker adhesive portions with the security tag will be removed from the article become. Alternatively, the at least two structures described can also be configured conversely in terms of their adhesive strength, so that, for example, the structure in the form of a lettering is weaker adhesive.
  • Such a void structure offers in connection with the described manipulation protection against exposure to moisture and the associated interruption of the second layer increased security against misuse of the security label.
  • The assembly may also include a stamped structure between the surface of the substrate layer and the first layer. Alternatively or additionally, one of the previously described layers and / or the void structure may have a stamped structure.
  • Also, a stamped structure offers in connection with the arrangement described an increased protection against tampering, for example, compared to security labels that offer no additional protection against tampering using moisture. For example, the substrate layer on punches, which are formed for example T or Y-shaped. Alternatively or additionally, in further embodiments of the arrangement, the first and / or the second layer has a stamped structure.
  • According to a second aspect of the invention, a method of producing a security tag comprises providing a substrate layer, providing a first substance having a first volume in a first state and a second volume in a second state when in contact with moisture greater than the first volume and providing a second substance having electrical conductivity. The method further comprises printing the first substance onto a surface of the substrate layer and thereby forming a first layer having a surface facing away from the substrate layer. The method further comprises, subsequent to the printing of the first substance, applying the second substance to the surface of the first layer and thereby forming a second layer.
  • The application of the second substance and the formation of the second layer on the surface of the first layer can be effected in particular by means of printing. Alternatively, the second layer can also be applied to the first layer by lamination, gas-phase coating or else galvanically.
  • In this context, a method for producing an embodiment of the arrangement described above is claimed, by means of which it is possible to produce a security label including a manipulation protection against improper detachment with its essential components by printing technology.
  • Optionally, in the context of the method, it is beneficial if the second substance is printed on the first layer with a small thickness. For example, it may be as thin as possible, so that a desired electrical conduction of the second layer can still be realized depending on a composition of the second substance. In this case, the application thickness relates to a thickness of the second layer substantially perpendicular to the surface of the substrate layer. Also, a geometry of the second layer parallel to the surface of the substrate layer may affect a break-up of the second layer in the transition from the first state to the second state.
  • The first substance comprises, for example, a lacquer, such as the 972 UV 0270 absorption varnish from RUCO, and a gelling agent, such as, for example, the superabsorbent polymer substance Z1069. It is useful, for example, when the first substance contains about 90% of the absorption varnish 972 UV 0270 and 10% of the gelling agent Z1069 in order to realize a printable paste which has the property of swelling in contact with moisture.
  • For example, if the second layer is printed in strips on the first layer, widths between 0.25 mm and 0.5 mm are advantageous. In terms of a plan view, the width in this context refers to the spatial dimension of the second layer, which has a significantly smaller value than the length.
  • The method may comprise printing the first substance and / or the second substance by means of a screen printing process.
  • A screen-printing method in this context forms a printing method in which the first and / or second substance is printed on the surface of the substrate layer, for example by means of a mesh-like screen.
  • For example, by using the screen printing method, it is beneficial to use a 32/70 or a 77/55 mesh to realize, for example, a desired electrical conductivity and geometry of the first and / or second layers.
  • The method may additionally comprise contacting the second layer with at least one conductor track of an electrical component.
  • In this way, by means of the described method, for example, a printed security label is realized which comprises, for example, an electrical component and in which a part of a conductor track of the electrical component is protected against abusive detachment and non-usual use.
  • Embodiments of the invention are explained in more detail below with reference to schematic drawings. Show it:
  • 1 an embodiment of an arrangement for a security label,
  • 2 another embodiment of an arrangement for a security label,
  • 3 another embodiment of an arrangement for a security label,
  • 4 a flow diagram for producing a security tag,
  • 5 an embodiment of an arrangement for an RFID transponder,
  • 6a an embodiment of an arrangement in a first state,
  • 6b an embodiment of the arrangement in a second state,
  • 7 Another embodiment of an arrangement for a security label.
  • Elements of the same construction and function are identified across the figures with the same reference numerals.
  • 1 schematically shows an embodiment of an arrangement 1 for a security label in a side view, which is a substrate layer 3 , a first shift 10 and a second layer 20 includes. The illustrated side view refers in this embodiment to a plane which is spanned by a z-axis and an x-axis. Accordingly, the z-direction and x-direction are in 1 shown.
  • The substrate layer 3 has a surface 5 on and the first layer 10 has a surface 11 on, that of the substrate layer 3 turned away and the second layer 20 is facing. In this embodiment, the first layer 10 and the second layer 20 with respect to the side view formed substantially geometrically identical, while the substrate layer 3 is geometrically longer in the x-direction. The surfaces 5 the substrate layer 3 and the surface 11 the first layer 10 are formed substantially parallel to each other and extend with respect to the drawn coordinate system in the xy plane.
  • The first shift 10 has a swellable property that increases its volume in contact with moisture. In this context, the first layer has 10 in a first state, a first volume and in a second state, when in or in contact with moisture, a second volume which is greater than the first volume. The first volume thus corresponds to an initial volume while the second volume represents a volume at which the first layer 10 For example, due to absorption of water or water vapor has increased. The property of absorbing and / or swelling moisture results, inter alia, from a material or a material combination of the first layer 10 ,
  • An increase in the volume of the first layer 10 In the transition from the first state to the second state essentially refers to a change in volume in the positive z-direction with respect to the illustrated embodiment. In addition, however, a change in volume in the other two spatial dimensions, the x- and y-direction is possible, these volume changes not primarily to a rupture of the second layer 20 contribute. Such breakup is primarily due to the change in volume in the positive z-direction. A volume change of the first layer 10 in the opposite direction is essentially through the adjacent substrate layer 3 prevents, for example, a greater resistance to the swelling first layer 10 represents as the printed second layer 20 ,
  • The second layer 20 has electrical conductivity and is therefore capable of conducting electrical signals. The electrically conductive property of the second layer 20 results among other things from a material or a material combination of the first layer 20 , For example, the second layer comprises 20 a silver conductive paste such that, for example, depending on a given concentration of conductive particles of the silver conductive paste, a given electrical conductivity of the second layer 20 can be realized.
  • The first shift 10 and the second layer 20 are arranged one above the other so that the second layer 20 is continuous in the first state and interrupted in the second state. Due to contact with moisture, the first layer swells 10 For example, asymmetric and causes irreversible destruction of the second layer at one or more locations 20 ,
  • In this way, an arrangement 1 for a humidity sensor which, in some applications, easily provides tamper protection against exposure to moisture and which, for example, contributes to abusive detachment and use of a label incorporating such an arrangement 1 includes. The second layer 20 has inter alia, depending on their material, an electrical conductivity and is for example by means of electrical lines 7 coupled with one or more electrical components whose predetermined operation by the described arrangement 1 can be easily protected against misuse using moisture.
  • If, for example, the second layer is part of a conductor track of an electrical component, the second layer breaks up 20 in the second state to a signal change that can be easily detected and evaluated. Or breaking up the second layer 20 leads to a complete loss of function of the electrical component, causing a misuse of the arrangement 1 or an associated security tag, which is an embodiment of the arrangement 1 includes, prevents or at least impedes. The second layer 20 essentially represents a signal path that, for example, as in 1 shown as a section of one or more electrical lines 7 forwards a signal. An interruption of the second layer 20 in the second state corresponds to an interruption of the signal path.
  • Referring to the illustrated side view in 1 is the arrangement 1 with respect to the positive z-direction as follows: on the substrate layer 3 is the first layer 10 arranged. On the first layer 10 is the second layer 20 arranged. In the opposite direction or from another point of view is the arrangement 1 formed as follows: on the second layer 20 is the first layer 10 arranged and on the first layer 10 is the substrate layer 3 arranged. Irrespective of an orientation, the first layer is thus relative to the z-direction 10 between the substrate layer 3 and the second layer 20 arranged.
  • The first shift 10 and the second layer 20 are for example on the substrate layer 3 imprinted, and thus enable a simple and cost-effective implementation of the arrangement 1 , For example, a first substance was applied to a part of the surface by means of a screen printing process 5 the substrate layer 3 imprinted and thereby the first layer 10 educated. The substrate layer 3 serves as a carrier material in this context and is for example a PET film.
  • For example, the first layer comprises 10 a gelling agent and / or varnish that realizes the described swelling function. Gelling agents are substances that swell in contact with water or bind water. Such gelling agents are admixed, for example, with a varnish or with an ink, thus making it possible to imprint the first layer 10 that involves the described property of swelling in contact with moisture.
  • One particular type of gelling agent is superabsorbent or superabsorbent polymeric substances which are, for example, powdered and which, in comparison to other gelling agents, have the properties of absorbing a relatively large amount of moisture and storing it over a relatively long period of time. Such a superabsorbent may also be mixed as a starting material with a lacquer or a printing ink in order to produce a printable paste, which then represents the first substance, by means of which the first layer 10 is trained. An example of a superabsorbent or a superabsorbent polymer substance is the gelling agent Z1069 from Evonik Industries AG.
  • In a subsequent step, a second substance is then applied to the surface 11 the first layer 10 imprinted and thereby the second layer 20 educated. The second substance and thus the second layer 20 For example, as already mentioned, a silver conductive paste comprises the electrical conductivity of the second layer 20 allows. In the context of printing, the silver conductive paste or the second substance includes, for example, resins, solvents and electroconductive particles. An example of a silver conductive paste is described by the abbreviation AG 1007.
  • The second layer 20 but may alternatively or additionally include other electrically conductive particles, such as copper or graphite, so that the second layer 20 comprises a copper conductive paste or a graphite conductive paste. In this case, the electrically conductive particles are usually plate-shaped, for example, in comparison to spherical particles to realize a higher electrical conductivity and lower resistances.
  • In connection with the described arrangement 1 For example, it is useful in a fine grained preparation by printing Use conductive paints or conductive pastes with plate-shaped electrically conductive particles, which swell when the first layer 10 in the second state have a finer fracture behavior than coarse-grained Leitlacke or conductive pastes.
  • In a further step, for example, then the second layer 20 coupled with one or more electrical components, wherein the electrical coupling with one or more electrical components in this embodiment by means of two electrical lines 7 is indicated.
  • Thus, the arrangement allows 1 a simple and inexpensive to manufacture tamper protection especially for security labels that include electrical components. An unauthorized intervention by means of moisture is thus made more difficult and consequently a contribution is made to counteract a manipulation. This leads to an increased security of a tamper protection compared, for example, to security labels containing such an arrangement 1 do not include.
  • 2 shows a further embodiment of the arrangement 1 in a plan view that represents, with respect to the drawn coordinate system, a plane spanned by the x-axis and the y-axis. Accordingly, the x-direction and y-direction are in 2 located.
  • In this supervision it can be seen that the second layer 20 compared to the first layer 10 is strip-shaped and also the first layer 10 surmounted with respect to a length in the x-direction. The second layer 20 is thus on the surface 11 the first layer 10 and on the surface 5 the substrate layer 3 arranged and for example by means of a printing process on the first layer 10 and the substrate layer 3 have been printed.
  • In contrast to the strip-shaped second layer 20 are the substrate layer in this embodiment 3 and the first layer 10 essentially flat. This may include that a geometric shape of the second layer 20 a significantly larger designed length, for example as shown in the x-direction, has as an associated width and thickness in the y and z directions. This means, for example, in relation to the illustrated supervision in 2 in that a length of the second layer 20 in the x-direction significantly over a width of the second layer 20 outweighs in the y direction. By way of example, a value of the length is at least twenty times as large as a value of the width, which in the plan view realizes a strip-shaped configuration of the second layer.
  • A strip-shaped second layer 20 For example, it serves as a trace of an antenna, for example 24 or a board and allows a space-saving implementation in an associated electrical component.
  • The term area is a geometry of the first layer 10 and substrate layer 3 For example, two out of three spatial dimensions have values of the same order of magnitude. For example, with respect to the plan view, a value of the length of the first layer 10 and / or the substrate layer 3 in the x-direction twice as large as a value of the width in the y-direction.
  • With respect to the drawn y-direction is the substrate layer 3 in this embodiment of the arrangement 1 made larger than the first layer 10 which in turn is made larger than the second layer 20 , With respect to the drawn x-direction, the second layer is 20 made larger than the substrate layer 3 , which in turn is made larger than the first layer 10 , Due to the illustrated supervision of the arrangement 1 in 2 the second layer appears 20 essentially the same length as the substrate layer 3 , But in that the first layer 10 has a thickness and the second layer 20 that on the first layer 10 is arranged, on both sides over the first layer 10 protrudes in the x direction, the second layer 20 consequently also formed longer than the substrate layer 3 , In further embodiments of the arrangement 1 can the second layer 20 also about the geometry of the substrate layer 3 be formed and this example, in the x-direction over the edges of the substrate layer 3 protrude. An exemplary schematic side view of the embodiment of the arrangement 1 out 3 is in 6a shown.
  • 3 shows a further embodiment of an arrangement 1 for a security label represented in the xz plane. Accordingly, the x and z directions are drawn. The order 1 includes in addition to the substrate layer 3 , the first layer 10 and the second layer 20 , a void structure 30 , an adhesive layer 50 and a protective layer 60 , The order 1 is on a surface 70 arranged and for example by means of the adhesive layer 50 glued on this. The underground 70 For example, is a windshield of a motor vehicle, so that the arrangement shown 1 and the illustrated embodiment realizes, for example, a security tag such as a vignette or an access authorization sticker that verifies that the motor vehicle is identified and marked as authorized.
  • The adhesive layer 50 allows an adhesive connection to the ground 70 which alternatively may also be a document or other object to be saved and verifiable. In this embodiment based on the positive z-direction below the adhesive layer 50 the void structure 30 arranged, which realizes a further manipulation protection of the security label.
  • The void structure 30 For example, one structure comprises two differently adherent structures, for example one structure as a weaker adhesive structure in the form of a lettering and the other structure as a more adhesive residue of the void structure 30 is trained. Becomes the void structure 30 or a security tag containing the void structure 30 applied, applied to an object to be secured remains at a release of the security label the more adhesive residue of the void structure 30 stick to the object, while the weak adhesive lettering with the security label is removed from the object. Back remains a part of the arrangement 1 , the removal of the corresponding part of the arrangement 1 is apparent.
  • Thus, such a void structure offers 30 an additional mechanical manipulation protection and in connection with the described manipulation protection against an abusive detachment by means of moisture by means of the first layer 10 and the second layer 20 increased security against unauthorized misuse of the device 1 or an associated security label.
  • Relative to the positive z-direction are below the void structure 30 the substrate layer 3 , the first layer 10 and the second layer 20 arranged, which is essentially the embodiment of the arrangement 1 out 1 equivalent. In addition, the second layer 20 in this embodiment with an antenna 24 electrically coupled, for example, an electrical connection to a loop antenna 80 or a dipole antenna.
  • Relative to the positive z-direction is on the second layer 20 the protective layer 60 arranged the arrangement 1 and in particular the second layer 20 For example, protects against environmental influences or external manipulation.
  • Referring to the illustrated side view in 3 is the arrangement 1 with respect to the positive z-direction formed as follows: on the ground 70 is the adhesive layer 50 arranged. On the adhesive layer 50 is the void structure 30 arranged. On the void structure 30 is the substrate layer 3 and on the substrate layer 3 is the first layer 10 arranged. On the first layer 10 is the second layer 20 arranged and on the second layer 20 is the protective layer 60 arranged. From another point of view is the arrangement 1 formed as follows: on the protective layer 60 is the second layer 20 and on the second layer 20 is the first layer 10 arranged. On the first layer 10 is the substrate layer 3 arranged. On the substrate layer 3 is the void structure 30 and on the void structure 30 is the adhesive layer 50 arranged. On the adhesive layer 50 is the underground 70 arranged.
  • With regard to the z-direction, the described layers are shown with different thicknesses, which is shown only by way of example in this embodiment. An associated thickness in the respective layer can also be designed differently. With respect to the x-direction, the respective layers are down to the ground 70 formed essentially the same length, but also also exemplified in this embodiment is shown and may be formed differently in further embodiments.
  • An arrangement or sequence of the described layers can also be designed differently. But here is the arrangement of the first layer 10 on the surface 5 the substrate layer 3 and the second layer 20 on the surface 11 the first layer 10 given. Alternatively to one of the illustrated layers or in addition, the arrangement 1 also include other layers, such as a stamped structure. Or existing layers, such as the substrate layer 3 , have a given stamped structure. A stamped structure provides in connection with the described arrangement 1 further manipulation protection by predefined shapes or geometries are punched out of the associated layer and thus realize sections, for example, in a release of the arrangement 1 from the underground 70 tearing easier than others.
  • 4 describes an embodiment of a flowchart for manufacturing the device 1 or a security tag, which is an embodiment of the arrangement 1 includes. For example, in a manufacturing process, the following steps are performed:
    In a first step S1, inter alia, the substrate layer 3 , the first substance and the second substance provided.
  • In a step S3, the first substance becomes the surface 5 the substrate layer 3 imprinted and thereby the first layer 10 with the surface 11 formed, that of the substrate layer 3 turned away.
  • In a subsequent next step S5 will be on the surface 11 the first layer 10 imprinting the second substance and thereby the second layer 20 formed, which has electrical conductivity. In cooperation with the first shift 10 Tamper protection is enabled for example, against improper detachment of an associated label by means of moisture and a non-common use of such. In this way, an embodiment of the arrangement 1 realized.
  • In a step S7, the second layer 20 coupled with one or more electrical components or with one or more electrical leads 7 provided to allow a later electrical coupling to electrical components.
  • In a further step S9, for example, a void structure 30 and / or a stamped structure with a predetermined shape on the second layer 20 or on the substrate layer 3 applied, for example, printed or glued.
  • In a step S11, for example, an adhesive layer 50 on an underside of the substrate layer 3 applied to the surface 5 the substrate layer 3 turned away. The arrangement thus produced 1 is then applied to, for example, a PET film or the adhesive layer 50 is covered with silicone paper. In this way, an embodiment of a security label is realized which, inter alia, offers increased protection against abusive detachment, in particular by exposure to moisture.
  • Except for the steps S3 and S5, which occur in chronological succession, an order of the described method steps may vary. For example, arranging the void structure 30 before printing the first substance on the surface 5 the substrate layer 3 respectively. But arranging or imprinting of the second substance always takes place in time after arranging or printing the first substance.
  • When printing the second substance, it may be beneficial, inter alia, if the second substance with a small thickness on the first layer 10 is printed, but still depending on a composition of the second substance, a desired electrical conduction of the second layer 20 is feasible. In this case, the thickness of the second layer refers 20 in the illustrated embodiments, to a thickness substantially perpendicular to the surface 5 the substrate layer 3 in the z direction.
  • The first substance comprises, for example, a lacquer, such as the 972 UV 0270 absorption varnish from RUCO, and a gelling agent, such as, for example, the superabsorbent polymer substance Z1069. It is useful, for example, when the first substance contains about 90% of the absorption varnish 972 UV 0270 and 10% of the gelling agent Z1069 in order to realize a printable paste which has the property of swelling in contact with moisture.
  • Will be the second layer 20 For example, strip on the first layer 10 For example, widths between 0.25 mm and 0.5 mm are advantageous. Other widths are also possible, provided that the described properties and function of the arrangement 1 are realized. With regard to a plan view, for example, of the xy plane in the illustrated embodiments, the width in this context denotes the spatial dimension of the second layer 20 , which has a much smaller value compared to the length. For example, the width of the second layer 20 in the embodiment in 2 formed in the y-direction and the length in the x-direction.
  • The printing of the first substance and / or the second substance can take place, for example, by means of a screen-printing process. A screen-printing method in this context forms a printing method in which the first and / or second substance is applied to the surface, for example by means of a mesh-like screen 5 the substrate layer 3 is printed. For example, by using the screen printing method, use of a 32/70 or a 77/55 mesh screen is beneficial to provide a desired electrical conductivity and a predetermined geometry of the first and / or second layers 10 . 20 to realize.
  • In this way, by means of the described method, for example, a printable security label is realized which comprises, for example, an electrical component in which the second layer 20 is a section of a conductor track of the electrical component. Thus, abusive detachment and use of the security label and the electrical component, for example, due to exposure to moisture, counteracted.
  • 5 describes an embodiment for an RFID transponder 90 that's the arrangement 1 includes. Shown in a plan view is the substrate layer 3 , on their surface 5 a loop antenna 80 pictured is that with a chip 26 and the second layer 20 the arrangement 1 electrically connected. The second layer 20 is in this embodiment, a part or a portion of a trace of the loop antenna 80 and realized in cooperation with the first layer 10 that is below the second layer 20 is arranged, protection against misuse of the RFID transponder 90 for example due to exposure to moisture.
  • In a further embodiment, the second layer 20 also with several tracks of the loop antenna 80 be electrically connected. Or there are several second layers 20 on the first layer 10 arranged, each having a portion of a conductor track of the loop antenna 80 realize that over the first layer 10 run. With respect to the illustrated embodiment in FIG 5 would be the first layer 10 greater, so that the three interconnects with respect to the illustrated plan view in the xy plane along a reference line AA 'in the y-direction on the first layer 10 run. On the first shift 10 are then, for example, three second layers 20 printed, each of which is electrically coupled to a conductor track.
  • This will protect against misuse of the RFID transponder 90 increased, because multiple tracks of the loop antenna 80 by means of the arrangement 1 sensitive to moisture exposure. Enlarged during contact of the first layer 10 with moisture the volume of the first layer 10 such that it transitions to the second state, the second layers break 20 on, so that they are no longer electrically conductive. If so, one of the three second layers 20 not completely breaking up, are two more second layers 20 each with a conductor track of the loop antenna 80 coupled and thus secure the function of the arrangement 1 as tamper protection.
  • The second layer 20 the arrangement 1 is thus in this embodiment with a trace of the loop antenna 80 of the RFID transponder 90 electrically connected, whose operation includes, inter alia, receiving and transmitting a respective signal. In the first state of the arrangement 1 is the electrically conductive second layer 20 continuous and functional and thus is the functioning of the RFID transponder 90 in terms of receiving and transmitting signals. In the second state, the first layer 10 so swollen that the second layer 20 is interrupted and thereby receiving and transmitting signals is no longer given or at least compared to the first state is changed so that it can be easily determined.
  • In the 6a and 6b is the arrangement 1 in the first state and the second state in a side view in the xz plane and represents, for example, the arrangement 1 of the embodiment 5 with the RFID transponder 90 , Unlike the arrangement 1 out 5 is in the embodiments of 6a and 6b the second layer 20 geometrically longer in the x-direction than the first layer 10 , Based on the illustrated side view in the xz plane, the second layer surrounds 20 the first layer 10 and closes this together with the substrate layer 3 one. The illustrated electrical cables 7 For example, portions of the coupled trace represent the loop antenna 80 that feel like in 5 shown further on the substrate layer 3 extends.
  • In the first state ( 6a ) has the first layer 10 the first volume, so that the overlying printed second layer 20 is formed throughout. The second layer 20 is thus consistently electrically conductive and consequently is also the RFID transponder 90 functional at least with regard to the arrangement 1 ,
  • But if the first layer 10 the arrangement 1 In contact with moisture, the first layer swells 10 and has compared to the first volume in the first state ( 6a ) an enlarged second volume in the second state ( 6b ) on. In this second state of the arrangement 1 has the volume of the first layer 10 increased so that the arranged above the second layer 20 interrupted and thus no longer continuously electrically conductive. In this context, the second layer 20 , interrupted irreversibly, causing a swelling of the first layer 10 For example, if the moisture absorbed is the first layer 10 leaves again, not again to the arrangement 1 in the first state leads. A manipulation attempt of the RFID transponder 90 and the arrangement 1 by means of moisture leads to an interruption of the second layer 20 at one or more locations, whereby an electrical conduction by means of the second layer 20 between a point A and a point B in the second state is no longer possible.
  • Is the arrangement 1 as described with the RFID transponder 90 electrically coupled, its operation is no longer given or at least no longer corresponds to a previous initial state as in, for example, in 6a is shown. Receiving and emitting signals by means of the RFID transponder is thus changed due to exposure to moisture.
  • In this way, a printable and cost-effective manipulation protection for security labels can be realized, which makes, among other things, a manipulation of electronic components easily recognizable.
  • 7 shows a further embodiment of the arrangement 1 in which the second layer 20 Wavy or meandering on the first layer 10 is arranged. Individual sections of the second layer 20 For example, they may be referred to as strip-shaped, so that the entire second layer 20 due to the meandering formation a larger part of the surface 11 the first layer 10 covered. In this way, it is possible, for example, an activation speed of the arrangement 1 increase, that the second layer 20 in terms of their length, a major portion of the swellable first layer 10 covered.

Claims (16)

  1. Arrangement ( 1 ) for a humidity sensor, comprising - a substrate layer ( 3 ) with a surface ( 5 ), - one on the surface ( 5 ) of the substrate layer ( 3 ) arranged first layer ( 10 ) with a surface ( 11 ) coming from the substrate layer ( 3 ), and - one on the surface ( 11 ) of the first layer ( 10 ) arranged second layer ( 20 ), which has electrical conductivity, - wherein the first layer ( 10 ) is configured to have a first volume in a first state, and in a second state, when in contact with moisture, to have a second volume greater than the first volume, the first layer ( 10 ) and the second layer ( 20 ) are arranged so that the second layer ( 20 ) is interrupted in the first state and interrupted in the second state.
  2. Arrangement ( 1 ) according to claim 1, wherein the first layer ( 10 ) and / or the second layer ( 20 ) on the substrate layer ( 3 ) are printed.
  3. Arrangement ( 1 ) according to claim 1 or 2, wherein the first layer ( 10 ) comprises a gelling agent and / or a varnish which and / or which swells in contact with moisture in the second state.
  4. Arrangement ( 1 ) according to one of claims 1 to 3, in which the first layer ( 10 ) comprises a superabsorbent that swells in contact with moisture in the second state.
  5. Arrangement ( 1 ) according to one of claims 1 to 4, in which the second layer ( 20 ) comprises a silver conductive paste having electrical conductivity.
  6. Arrangement ( 1 ) according to one of claims 1 to 5, in which the second layer ( 20 ) is strip-shaped.
  7. Arrangement ( 1 ) according to one of claims 1 to 5, in which the first layer ( 10 ) and the second layer ( 20 ) are formed flat.
  8. Arrangement ( 1 ) according to one of claims 1 to 7, in which the second layer ( 20 ) is a portion of a conductor track of an electrical component.
  9. Arrangement ( 1 ) according to one of claims 1 to 8, in which the second layer ( 20 ) a portion of a trace of an antenna ( 24 ) of a transponder.
  10. Arrangement ( 1 ) according to claim 9, in which the antenna ( 24 ) is a loop antenna or a dipole antenna.
  11. Arrangement ( 1 ) according to one of claims 1 to 10, in which the second layer ( 20 ) is a portion of a trace of an RFID transponder.
  12. Arrangement ( 1 ) according to one of claims 1 to 11, in which a void structure ( 30 ) between the surface ( 5 ) of the substrate layer ( 3 ) and the first layer ( 10 ) is arranged.
  13. Arrangement ( 1 ) according to one of claims 1 to 12, in which a stamped structure ( 40 ) between the surface ( 5 ) of the substrate layer ( 3 ) and the first layer ( 10 ) and / or one of the layers ( 3 . 10 . 20 ) and / or the void structure ( 30 ) a stamped structure ( 40 ) having.
  14. Method for producing a label with a moisture sensor, comprising - providing a substrate layer ( 3 Providing a first substance which in a first state has a first volume and in a second state when in contact with moisture has a second volume which is greater than the first volume; providing a second substance which having electrical conductivity, - printing the first substance onto a surface ( 5 ) of the substrate layer ( 3 ) and thereby forming a first layer ( 10 ) with a surface ( 11 ) coming from the substrate layer ( 3 ) and subsequently - applying the second substance to the surface ( 11 ) of the first layer ( 10 ) and thereby forming a second layer ( 20 ).
  15. The method of claim 14, comprising printing the first substance and / or the second substance by means of a screen printing process.
  16. A method according to claim 14 or 15, comprising contacting the second layer ( 20 ) with at least one conductor track of an electrical component.
DE102014118353.3A 2014-12-10 2014-12-10 Arrangement for a humidity sensor and method for producing the arrangement for a humidity sensor Pending DE102014118353A1 (en)

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DE102014118353.3A DE102014118353A1 (en) 2014-12-10 2014-12-10 Arrangement for a humidity sensor and method for producing the arrangement for a humidity sensor

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DE102014118353.3A DE102014118353A1 (en) 2014-12-10 2014-12-10 Arrangement for a humidity sensor and method for producing the arrangement for a humidity sensor
PCT/EP2015/079151 WO2016091964A1 (en) 2014-12-10 2015-12-09 Arrangement for a humidity sensor and method for producing the arrangement for a humidity sensor

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