WO2001054058A1 - Method to manufacture a smart label inlet web and a smart label inlet web - Google Patents

Method to manufacture a smart label inlet web and a smart label inlet web Download PDF

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Publication number
WO2001054058A1
WO2001054058A1 PCT/FI2001/000037 FI0100037W WO0154058A1 WO 2001054058 A1 WO2001054058 A1 WO 2001054058A1 FI 0100037 W FI0100037 W FI 0100037W WO 0154058 A1 WO0154058 A1 WO 0154058A1
Authority
WO
WIPO (PCT)
Prior art keywords
web
smart label
adhesive
radiation
film
Prior art date
Application number
PCT/FI2001/000037
Other languages
French (fr)
Inventor
Samuli STRÖMBERG
Original Assignee
Rafsec Oy
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 Rafsec Oy filed Critical Rafsec Oy
Priority to AU28539/01A priority Critical patent/AU2853901A/en
Priority to EP01942764A priority patent/EP1249004A1/en
Priority to JP2001554280A priority patent/JP2003520666A/en
Publication of WO2001054058A1 publication Critical patent/WO2001054058A1/en
Priority to US10/191,968 priority patent/US20030029540A1/en
Priority to US11/217,199 priority patent/US7236093B2/en

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/04—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the shape
    • G06K19/041—Constructional details
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/07718—Constructional details, e.g. mounting of circuits in the carrier the record carrier being manufactured in a continuous process, e.g. using endless rolls
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing

Definitions

  • the present invention relates to a method for the manufacture of a smart label inlet web, a smart label inlet web, and a smart label card.
  • a smart label inlet web comprises successive smart labels suitably spaced in a continuous sequence on a back web.
  • the smart label inlet web is normally used as a raw material for further processing in the manufacture of a smart label product.
  • the smart label inlet web is introduced between a facing paper and a back paper for a label, before the ready labels are punched off the web.
  • smart labels refer to labels comprising an RF-ID circuit (identification) or an RF-EAS circuit (electronic article surveillance).
  • RF-ID circuit identity
  • RF-EAS circuit electronic article surveillance
  • FIG. 15 shows a smart label inlet web comprising electronic product control means 240 having an adhesive background and comprising a thin film and an oscillating circuit protected by a small plastic cover.
  • the manufacture of the smart label inlet web involves several problems. Discharges of static electricity during the manufacturing process or moisture, particularly in a long term, may damage a smart label having no protection so that it becomes useless.
  • a suitable protec- tion for example a plastic film or paper
  • Conventional wet lamination processes and direct application of a hot-melt adhesive on the smart label are poorly suited alternatives, because the smart label is sub- jected to mechanical stress and heat stress in these processes.
  • waste is also produced especially at the beginning of the manufacturing process, particularly when wet lamination is used, because the production parametres are usually not successfully set at once.
  • the smart label may comprise a silicon chip with an integrated circuit attached on its surface.
  • the chip whose thickness is typically more than 50 ⁇ m, forms a bulge on the surface of the smart label, which is a problem e.g. at the stages of further processing, because the profile of the smart label is uneven.
  • the above-mentioned problems can be reduced by the method according to claim 1 , which is characterized in that the adhesive is cured by radiation.
  • the smart label inlet web according to the invention is characterized in that the surface film is attached to the smart label with an adhesive cured by radiation.
  • the smart label card according to the invention is characterized in that the surface film is attached to the smart label with an adhesive cured by radiation.
  • the chip is brittle and may be damaged, if there are angles with a small radius in the manufacturing process and/or if the smart label is pressed with a too hard compression load for example in a hard nip.
  • the blank for a smart label inlet web comprises a back web, a smart label web and a surface web which are uniformly continuous and are attached to each other.
  • the back web is uniformly continuous, but the surface web and the smart label web are punched into pieces separated from each other and having a fixed size. In this application, these pieces are referred to as the cover film and the smart label. It is also possible that the blank for a smart label inlet web is punched into pieces, separated from each other and having a fixed size, in such a way that the back web is also punched. In this way, smart label cards are formed.
  • the surface of the back web which may be for example a release paper with a silicon coating, is provided with an adhesive.
  • the adhesive can be any adhesive that is suitable for the purpose, for example a pressure-sensitive adhesive (PSA) which is easily adhered at room temperature.
  • PSA pressure-sensitive adhesive
  • the smart label web is a carrier web containing smart labels one after each other.
  • the smart label web can be for example a plastic film.
  • the smart label can be made either by etching the required conductive cir- cuit in a metal or by pressing the required conductive circuit with an electroconductive ink on the smart label web.
  • RFID radio frequency identification
  • the electrically operating radio frequency identification (RFID) circuit of the smart label is a simple electric oscillating circuit (RCL circuit) operating at a defined frequency.
  • the circuit consists of a coil, a capacitor and an integrated cir- cuit on a chip.
  • the integrated circuit comprises an escort memory and an RF part which is arranged to communicate with a reader device. Also the capacitor of the RCL circuit can be integrated on the chip.
  • the surface web is a film provided with an adhesive, such as a hot-melt adhesive, on its lower surface, i.e. on the side of the smart label.
  • the hot-melt adhesive is preferably curable by radiation, wherein the adherence of the adhesive can be controlled by controlling the quantity of the radiation dose. Suitable methods for curing by radiation include curing by ultraviolet radiation or curing by an electron beam.
  • the surface web is a plastic film, preferably a polyolefine film, such as a polypropylene or polyethylene film.
  • the back web, the smart label web and the surface web are attached to each other by introducing them simultaneously into a nip which can be for example a nip formed by two rolls or a nip formed by a roll and a belt.
  • the adhesive of the back web adheres to the lower surface of the smart label web, and the adhesive of the surface web adheres to the upper surface of the smart label web.
  • the adhesive can be suitably heated e.g. with an infrared heater, to provide the adhesive with suitable properties of adhesion to the smart label web.
  • At least one of the contact surfaces forming the nip, such as rolls or belts, has a resilient surface, wherein a long nip is formed.
  • the smart label inlet web formed by the attached webs is led to radiation, wherein the adhesive is finally cross-linked. After this, the smart label web and the surface web are punched into a smart label and a surface film of a fixed size. The material left over from the webs is removed from the surface of the back web, and the ready smart label inlet web is reeled up. In some applications, it is also possible to punch the back web into back films of fixed size, wherein smart label cards are formed, whose back film remains in its position in the ready product.
  • the surface web protects the smart label web from external effects.
  • the surface web prevents damage to the electrical properties of the circuit caused by the effect of moisture or mechanically. It also protects the integrated circuit on the chip as well as its attachment from ambient factors, mechanical stress and discharges of static electricity. All the above-mentioned phenomena may completely break the circuit or impair its efficiency.
  • a chip can be attached to each smart label of the smart label web for example by a so-called flip-chip technique, known as such.
  • the adhesive to be applied to the interface of the surface film and the smart label is an important factor in how successfully the smart label is protected from external effects.
  • the hydrofobic/hydrophilic properties of the adhesive and the change of the mechanical properties by the effect of moisture must be taken into account.
  • Particularly suitable adhesives for this purpose include, thanks to their slight absorption of moisture, hot-melt adhesives, particularly adhesives which can be cross-linked by UV radiation or electron beam curing and which can be transfer laminated.
  • the adhesive layer formed on the release web of the surface web is transfer laminated, and after this, the polymer is cross-linked further. Cross-linking can be controlled by adjusting the energy supplied to the system.
  • UV hot-melt adhesives whose cross-linking can be adjusted by adjusting the quantity of the UV radiation.
  • the radiation requires a protective film passing UV radiation, wherein for example polyethylene and polypropylene films are well suited for the purpose.
  • EB elec- tron beam
  • the penetration depth must be suitably selected so that it will not affect the functional properties of the chip.
  • the web When using an adhesive that is cross-linked by radiation, the web does not need to be subjected to a hard pressure in the nip upon attaching the webs, because the adhesion of the adhesive can be improved by cross- linking after the nip. It is also possible that the smart label web is laminated between the surface and back webs in such a way that the back web is not intended to be removed at a stage of further processing, but it is punched into a back film having a fixed size and remaining in its position also in the final product. In this way, a card is formed which can be used e.g. as a disposable charge card, such as a ticket or a charge card for a bus.
  • a disposable charge card such as a ticket or a charge card for a bus.
  • Such a card can also be used as a product control means, for example sewn or heat-sealed inside a garment.
  • the surface and back webs of such cards can be made of for example plastic, paper or board.
  • a suitable curing method is curing by an electron beam.
  • properties that can be required of the surface and back webs include suitability for heat sealing, rigidity, and good mechanical, optical and visual properties.
  • the speed used in the process of manufacturing the smart label inlet web is relatively slow, wherein a good result is obtained with a long nip time in a soft and long nip.
  • the long nip can be formed for example between two rolls or between a roll and a resilient belt.
  • at least one of the rolls has a resilient surface, wherein at least part of the material of the roll can be of an elastomer. It is also possible that both of the rolls forming the nip have a resilient surface.
  • the tension of the back and surface webs is adjusted by methods known as such, but the smart label web is slack when it is led to lami- nation.
  • the risk of breaking the smart label is reduced, when it is run only once through the nip in the lamination process.
  • the risk of breaking is reduced, when the smart label is subjected to a low surface pressure when compared with using a hard nip.
  • the path of the smart label is more straight in a soft nip than in a hard nip which may easily have quickly turning angles.
  • the smart label inlet web is introduced between the surface and back webs in the process, and after that, the ready labels are possibly punched off the web, wherein separate smart label products are formed.
  • the labels can be printed, wherein for achieving a good printing result, the profile of the smart label product must be even. Problems in the smoothness are particu- larly caused by the chip of the smart label which forms a clear bulge on the surface of the smart label product. The bulge can be made smaller by trying to remove the adhesive layer of the surface web from the surface of the chip.
  • a hot-melt adhesive which is either a hot-melt adhesive cured by radiation, such as ultraviolet radiation or an electron beam, or a normal hot-melt adhesive that can be made fluid by heating, can be made to run off the surface of the chip.
  • a hot-melt adhesive curable by ultraviolet radiation or by an electron beam can be left fluid upon the lamination of the surface web, wherein no additional heating is necessary.
  • Fig. 1 shows a smart label web in a top view
  • Fig. 2 shows the process of manufacturing a smart label inlet web in a schematic view
  • Fig. 3 shows a side view of the ready smart label inlet web.
  • FIG. 1 shows a smart label web W2 in a top view, including a single smart label 12 comprising a circuitry pattern 13 and an integrated circuit 14 therein.
  • the smart label 12 can be manufactured by pressing the circuitry pattern on a film with an electroconductive printing ink or by etching the circuitry pattern on a metal film.
  • the circuitry pattern is provided with an identification circuit, such as a radio frequency identification (RFID) circuit.
  • RFID radio frequency identification
  • the identification circuit is a simple electric oscillating circuit (RCL circuit) tuned to operate at a defined frequency.
  • the circuit consists of a coil, a capacitor and a circuit integrated on a chip, consisting of an escort memory and an RF part for communication with a reader device.
  • the capacitor of the RCL circuit can also be integrated on the chip.
  • Figure 2 shows the process of manufacturing a smart label inlet web.
  • a continuous web comprising a surface web W1 is unwound from a reel 5. From the reverse side of the surface web W1 , the release web of the surface web is released and, after the releasing, it is reeled up on a roll 4. On the side where the release web was released, the surface web W1 is impregnated with an adhesive whose adhesion can be improved by heating it with a heater 7 which can be for example an infrared heater.
  • the material of the surface web W1 is preferably a polyolefine film, such as a polypropylene or polyethylene film.
  • the smart label web W2 containing smart labels 12 one after another on a carrier web, is unwound from a reel 3.
  • the carrier web may also contain several smart labels side by side.
  • the material of the smart label web W2, onto whose surface the circuitry pattern is formed and the integrated circuit is attached, is preferably a plastic film with a suitable rigidity.
  • a continuous web comprising a back web W3 is unwound from a reel 1. From the reverse side of the back web W3, the release web of the back web is released and, after the releasing, it is reeled up on a roll 2. On the side where the release web was released, the back web W3 is provided with an adhesive.
  • the adhesive can be for example a pressure-sensitive adhesive which can be made to adhere to another surface by pressing it against the other surface.
  • the surface web W1 , the smart label web W2 and the back web W3 are attached to each other in a nip N1 formed by rolls 8 and 9, which is a resilient, long nip.
  • the nip N1 is followed by a radiator device 10 to which the blank W4 of the smart label inlet web is led.
  • the radiator device 10 can produce ultraviolet radiation or electron beams.
  • the blank W4 of the smart label inlet web is further introduced to a punching unit 18 in which the surface web W1 and the smart label web W2 are punched at a suitable location so that the surface of the back web W3 is provided with a sequence of smart labels 12 of a fixed size and protective surface films 15 on top of them.
  • FIG 3 shows the cross-section of the ready smart label inlet web in the longitudinal direction of the web.
  • the back web W3 is a continuous carrier web for the smart label 12 under the surface film 15.
  • the surface web W1 and the smart label web W2 are punched as a cover film 15 and a smart label 12.
  • the excess parts of the surface web W1 and the smart label web W2 left at the edges upon punching are removed from the back web W3.
  • the interface 16 between the back we W3 and the smart label 12 is provided with an adhesive layer which can be for example a pressure-sensitive adhesive.
  • the interface 17 between the smart label 12 and the cover film 15 is provided with an adhesive layer which is preferably a hot-melt adhesive cured by means of ultraviolet (UV) radiation or an electron beam (EB).
  • UV ultraviolet
  • EB electron beam
  • the back web W3 is a release paper whose surface on the side of the smart label 12 is treated in such a way that the smart label 12 and the cover film 15 can be easily detached together from the back web W3 at the interface 16.
  • the cover film 15 is a film passing UV radiation, such as a polyolefine film.
  • a hot-melt adhesive curable by ultraviolet radiation (acResin A 258 UV, BASF AG, Germany) and a conventional adhesive were used in a comparison test on the attachment of synthetic films.
  • Samples were drawn with a tension device (Instron) at the angle of 180° at the speed of 300 mm/min, and the withdrawal force was measured.
  • the force required for the detachment was the following for the different adhesives (average of the measurements):
  • the invention is not restricted to the description above, but it may vary within the scope of the claims.
  • the method according to the invention can be used in all suitable uses where a protection is required for the smart label.
  • the smart label inlet web does not necessarily need to be ready in the form of a continuous web, but single smart labels can be fed with a suitable feeding device.
  • the blank of the smart label inlet web can be punched into smart label cards which comprise a film on both sides of the smart label, no adhesive being normally applied on the outer surface of the films.
  • the main idea in the present invention is that by using an adhesive of a particular type, it is possible to protect the properties of the smart label and thus to improve the quality and reliability of the manufacture.

Abstract

The invention relates to a method for the manufacture of a smart label inlet web (W5), in which method a smart label (12) is protected from external effects by means of a surface film (15) coated with an adhesive, the adhesive being in contact with the smart label (12). The adhesive is cured by radiation. The invention also relates to a smart label inlet web (W5) comprising a surface film (15), a smart label (12) and a back web (W3) attached to each other. The surface film (15) is attached to the smart label (12) with an adhesive cured by radiation.

Description

METHOD TO MANUFACTURE A SMART LABEL INLET WEB AND A SMART LABEL INTET WEB
The present invention relates to a method for the manufacture of a smart label inlet web, a smart label inlet web, and a smart label card. A smart label inlet web comprises successive smart labels suitably spaced in a continuous sequence on a back web. The smart label inlet web is normally used as a raw material for further processing in the manufacture of a smart label product. At the stage of further processing e.g. by a printing machine, the smart label inlet web is introduced between a facing paper and a back paper for a label, before the ready labels are punched off the web.
In the present application, smart labels refer to labels comprising an RF-ID circuit (identification) or an RF-EAS circuit (electronic article surveillance). In this Finnish application, the English terms corresponding to the Finnish terms are often included in parenthesis, because the English terms are regularly used by persons skilled in the art.
A known smart label inlet web is disclosed in US patent publication 5,867,102. In the publication, Fig. 15 shows a smart label inlet web comprising electronic product control means 240 having an adhesive background and comprising a thin film and an oscillating circuit protected by a small plastic cover.
The manufacture of the smart label inlet web involves several problems. Discharges of static electricity during the manufacturing process or moisture, particularly in a long term, may damage a smart label having no protection so that it becomes useless. When a suitable protec- tion, for example a plastic film or paper, is attached with a conventional adhesive onto the smart label, it is relatively easy to detach, and the smart label can thus be easily damaged. Conventional wet lamination processes and direct application of a hot-melt adhesive on the smart label are poorly suited alternatives, because the smart label is sub- jected to mechanical stress and heat stress in these processes. In the process, waste is also produced especially at the beginning of the manufacturing process, particularly when wet lamination is used, because the production parametres are usually not successfully set at once.
The smart label may comprise a silicon chip with an integrated circuit attached on its surface. The chip, whose thickness is typically more than 50 μm, forms a bulge on the surface of the smart label, which is a problem e.g. at the stages of further processing, because the profile of the smart label is uneven. The above-mentioned problems can be reduced by the method according to claim 1 , which is characterized in that the adhesive is cured by radiation. The smart label inlet web according to the invention is characterized in that the surface film is attached to the smart label with an adhesive cured by radiation. The smart label card according to the invention is characterized in that the surface film is attached to the smart label with an adhesive cured by radiation.
The chip is brittle and may be damaged, if there are angles with a small radius in the manufacturing process and/or if the smart label is pressed with a too hard compression load for example in a hard nip. These problems can be reduced by the method presented in the dependent claims 5 and 6.
The blank for a smart label inlet web comprises a back web, a smart label web and a surface web which are uniformly continuous and are attached to each other. In the ready smart label inlet web, the back web is uniformly continuous, but the surface web and the smart label web are punched into pieces separated from each other and having a fixed size. In this application, these pieces are referred to as the cover film and the smart label. It is also possible that the blank for a smart label inlet web is punched into pieces, separated from each other and having a fixed size, in such a way that the back web is also punched. In this way, smart label cards are formed.
The surface of the back web, which may be for example a release paper with a silicon coating, is provided with an adhesive. The adhesive can be any adhesive that is suitable for the purpose, for example a pressure-sensitive adhesive (PSA) which is easily adhered at room temperature. The smart label web is a carrier web containing smart labels one after each other. The smart label web can be for example a plastic film. The smart label can be made either by etching the required conductive cir- cuit in a metal or by pressing the required conductive circuit with an electroconductive ink on the smart label web. The electrically operating radio frequency identification (RFID) circuit of the smart label is a simple electric oscillating circuit (RCL circuit) operating at a defined frequency. The circuit consists of a coil, a capacitor and an integrated cir- cuit on a chip. The integrated circuit comprises an escort memory and an RF part which is arranged to communicate with a reader device. Also the capacitor of the RCL circuit can be integrated on the chip.
The surface web is a film provided with an adhesive, such as a hot-melt adhesive, on its lower surface, i.e. on the side of the smart label. The hot-melt adhesive is preferably curable by radiation, wherein the adherence of the adhesive can be controlled by controlling the quantity of the radiation dose. Suitable methods for curing by radiation include curing by ultraviolet radiation or curing by an electron beam. The surface web is a plastic film, preferably a polyolefine film, such as a polypropylene or polyethylene film.
The back web, the smart label web and the surface web are attached to each other by introducing them simultaneously into a nip which can be for example a nip formed by two rolls or a nip formed by a roll and a belt. The adhesive of the back web adheres to the lower surface of the smart label web, and the adhesive of the surface web adheres to the upper surface of the smart label web. Before the nip, the adhesive can be suitably heated e.g. with an infrared heater, to provide the adhesive with suitable properties of adhesion to the smart label web. At least one of the contact surfaces forming the nip, such as rolls or belts, has a resilient surface, wherein a long nip is formed. The smart label inlet web formed by the attached webs is led to radiation, wherein the adhesive is finally cross-linked. After this, the smart label web and the surface web are punched into a smart label and a surface film of a fixed size. The material left over from the webs is removed from the surface of the back web, and the ready smart label inlet web is reeled up. In some applications, it is also possible to punch the back web into back films of fixed size, wherein smart label cards are formed, whose back film remains in its position in the ready product.
The surface web protects the smart label web from external effects. The surface web prevents damage to the electrical properties of the circuit caused by the effect of moisture or mechanically. It also protects the integrated circuit on the chip as well as its attachment from ambient factors, mechanical stress and discharges of static electricity. All the above-mentioned phenomena may completely break the circuit or impair its efficiency. A chip can be attached to each smart label of the smart label web for example by a so-called flip-chip technique, known as such.
The adhesive to be applied to the interface of the surface film and the smart label is an important factor in how successfully the smart label is protected from external effects. The hydrofobic/hydrophilic properties of the adhesive and the change of the mechanical properties by the effect of moisture must be taken into account. Particularly suitable adhesives for this purpose include, thanks to their slight absorption of moisture, hot-melt adhesives, particularly adhesives which can be cross-linked by UV radiation or electron beam curing and which can be transfer laminated. The adhesive layer formed on the release web of the surface web is transfer laminated, and after this, the polymer is cross-linked further. Cross-linking can be controlled by adjusting the energy supplied to the system. It is possible to use UV hot-melt adhesives, whose cross-linking can be adjusted by adjusting the quantity of the UV radiation. The radiation requires a protective film passing UV radiation, wherein for example polyethylene and polypropylene films are well suited for the purpose. It is also possible to cure the adhesive by elec- tron beam (EB) curing, wherein it is possible to use a range of films with a larger material basis than when UV radiation is used, because in this case the film does not need to pass UV radiation. When curing by an electron beam is used, the penetration depth must be suitably selected so that it will not affect the functional properties of the chip. When using an adhesive that is cross-linked by radiation, the web does not need to be subjected to a hard pressure in the nip upon attaching the webs, because the adhesion of the adhesive can be improved by cross- linking after the nip. It is also possible that the smart label web is laminated between the surface and back webs in such a way that the back web is not intended to be removed at a stage of further processing, but it is punched into a back film having a fixed size and remaining in its position also in the final product. In this way, a card is formed which can be used e.g. as a disposable charge card, such as a ticket or a charge card for a bus. Such a card can also be used as a product control means, for example sewn or heat-sealed inside a garment. The surface and back webs of such cards can be made of for example plastic, paper or board. In cases in which the material does not pass UV radiation, a suitable curing method is curing by an electron beam. In these uses, properties that can be required of the surface and back webs include suitability for heat sealing, rigidity, and good mechanical, optical and visual properties.
The speed used in the process of manufacturing the smart label inlet web is relatively slow, wherein a good result is obtained with a long nip time in a soft and long nip. The long nip can be formed for example between two rolls or between a roll and a resilient belt. In a nip formed by two rolls, at least one of the rolls has a resilient surface, wherein at least part of the material of the roll can be of an elastomer. It is also possible that both of the rolls forming the nip have a resilient surface. The tension of the back and surface webs is adjusted by methods known as such, but the smart label web is slack when it is led to lami- nation. By simultaneous lamination of the surface web and the back web, the risk of breaking the smart label is reduced, when it is run only once through the nip in the lamination process. Similarly, by using a long, soft nip, the risk of breaking is reduced, when the smart label is subjected to a low surface pressure when compared with using a hard nip. Furthermore, the path of the smart label is more straight in a soft nip than in a hard nip which may easily have quickly turning angles.
In further processing, the smart label inlet web is introduced between the surface and back webs in the process, and after that, the ready labels are possibly punched off the web, wherein separate smart label products are formed. In further processing, the labels can be printed, wherein for achieving a good printing result, the profile of the smart label product must be even. Problems in the smoothness are particu- larly caused by the chip of the smart label which forms a clear bulge on the surface of the smart label product. The bulge can be made smaller by trying to remove the adhesive layer of the surface web from the surface of the chip. A hot-melt adhesive, which is either a hot-melt adhesive cured by radiation, such as ultraviolet radiation or an electron beam, or a normal hot-melt adhesive that can be made fluid by heating, can be made to run off the surface of the chip. A hot-melt adhesive curable by ultraviolet radiation or by an electron beam can be left fluid upon the lamination of the surface web, wherein no additional heating is necessary.
In the following, the invention will be described with reference to the appended drawings, in which
Fig. 1 shows a smart label web in a top view,
Fig. 2 shows the process of manufacturing a smart label inlet web in a schematic view, and
Fig. 3 shows a side view of the ready smart label inlet web.
Figure 1 shows a smart label web W2 in a top view, including a single smart label 12 comprising a circuitry pattern 13 and an integrated circuit 14 therein. The smart label 12 can be manufactured by pressing the circuitry pattern on a film with an electroconductive printing ink or by etching the circuitry pattern on a metal film. The circuitry pattern is provided with an identification circuit, such as a radio frequency identification (RFID) circuit. The identification circuit is a simple electric oscillating circuit (RCL circuit) tuned to operate at a defined frequency. The circuit consists of a coil, a capacitor and a circuit integrated on a chip, consisting of an escort memory and an RF part for communication with a reader device. The capacitor of the RCL circuit can also be integrated on the chip.
Figure 2 shows the process of manufacturing a smart label inlet web. A continuous web comprising a surface web W1 is unwound from a reel 5. From the reverse side of the surface web W1 , the release web of the surface web is released and, after the releasing, it is reeled up on a roll 4. On the side where the release web was released, the surface web W1 is impregnated with an adhesive whose adhesion can be improved by heating it with a heater 7 which can be for example an infrared heater. The material of the surface web W1 is preferably a polyolefine film, such as a polypropylene or polyethylene film.
The smart label web W2 containing smart labels 12 one after another on a carrier web, is unwound from a reel 3. The carrier web may also contain several smart labels side by side. The material of the smart label web W2, onto whose surface the circuitry pattern is formed and the integrated circuit is attached, is preferably a plastic film with a suitable rigidity.
A continuous web comprising a back web W3 is unwound from a reel 1. From the reverse side of the back web W3, the release web of the back web is released and, after the releasing, it is reeled up on a roll 2. On the side where the release web was released, the back web W3 is provided with an adhesive. The adhesive can be for example a pressure- sensitive adhesive which can be made to adhere to another surface by pressing it against the other surface.
The surface web W1 , the smart label web W2 and the back web W3 are attached to each other in a nip N1 formed by rolls 8 and 9, which is a resilient, long nip. The nip N1 is followed by a radiator device 10 to which the blank W4 of the smart label inlet web is led. The radiator device 10 can produce ultraviolet radiation or electron beams. The blank W4 of the smart label inlet web is further introduced to a punching unit 18 in which the surface web W1 and the smart label web W2 are punched at a suitable location so that the surface of the back web W3 is provided with a sequence of smart labels 12 of a fixed size and protective surface films 15 on top of them. After the punching, excess parts of the surface web W1 and the smart label web W3 are left outside the smart label 12 and the surface film and are removed by reeling up the excess material on a reel 19. The ready made smart label inlet web W5 is reeled up on a reel 11.
Figure 3 shows the cross-section of the ready smart label inlet web in the longitudinal direction of the web. The back web W3 is a continuous carrier web for the smart label 12 under the surface film 15. The surface web W1 and the smart label web W2 are punched as a cover film 15 and a smart label 12. The excess parts of the surface web W1 and the smart label web W2 left at the edges upon punching are removed from the back web W3. The interface 16 between the back we W3 and the smart label 12 is provided with an adhesive layer which can be for example a pressure-sensitive adhesive. The interface 17 between the smart label 12 and the cover film 15 is provided with an adhesive layer which is preferably a hot-melt adhesive cured by means of ultraviolet (UV) radiation or an electron beam (EB).
The back web W3 is a release paper whose surface on the side of the smart label 12 is treated in such a way that the smart label 12 and the cover film 15 can be easily detached together from the back web W3 at the interface 16. The cover film 15 is a film passing UV radiation, such as a polyolefine film.
Example.
A hot-melt adhesive curable by ultraviolet radiation (acResin A 258 UV, BASF AG, Germany) and a conventional adhesive were used in a comparison test on the attachment of synthetic films. Samples were drawn with a tension device (Instron) at the angle of 180° at the speed of 300 mm/min, and the withdrawal force was measured. The force required for the detachment (peel value) was the following for the different adhesives (average of the measurements):
Conventional adhesive 16 N / 48 mm
Adhesive cured by ultraviolet radiation 22 N / 48 mm
It is seen from the results that the adhesive curable by ultraviolet radiation yields an increase of about 37 % when compared with the conventional adhesive.
The invention is not restricted to the description above, but it may vary within the scope of the claims. The method according to the invention can be used in all suitable uses where a protection is required for the smart label. The smart label inlet web does not necessarily need to be ready in the form of a continuous web, but single smart labels can be fed with a suitable feeding device. The blank of the smart label inlet web can be punched into smart label cards which comprise a film on both sides of the smart label, no adhesive being normally applied on the outer surface of the films. The main idea in the present invention is that by using an adhesive of a particular type, it is possible to protect the properties of the smart label and thus to improve the quality and reliability of the manufacture.

Claims

Claims:
1. A method for the manufacture of a smart label inlet web (W5), in which method a smart label (12) is protected from external effects by means of a surface film (15) coated with an adhesive, the adhesive being in contact with the smart label (12), characterized in that the adhesive is cured by radiation.
2. The method according to claim 1 , characterized in that the adhesive is cured by means of ultraviolet (UV) radiation or electron beam (EB) curing.
3. The method according to claim 1 or 2, characterized in that the adhesive is applied onto a surface web (W1) by transfer lamination.
4. The method according to any of the preceding claims, characterized in that the surface web (W1) is a polyolefine film.
5. The method according to any of the preceding claims, character- ized in that the surface web (W1), the smart label web (W2) and the back web (W3) are attached in the same nip (N1).
6. The method according to claim 5, characterized in that at least one of the two contact surfaces forming the nip (N1) has a resilient surface.
7. The method according to claim 5 or 6, characterized in that before the attachment of the webs (W1 , W2, W3), release webs are released from the reverse side of the surface web (W1) and from the reverse side of the back web (W3).
8. The method according to claim 5, characterized in that after the radiation of the adhesive, the smart label (12) and the surface film (15) on the surface of the back web (W3) are punched off the attached surface web (W1) and the smart label web (W2), and excess material is removed.
9. The method according to claim 8, characterized in that the ready smart label inlet web (W5) is reeled up on a roll (1 1).
10. The method according to claim 5, characterized in that after the radiation of the adhesive, the smart label (12), the surface film (15) and the back film are punched off the attached surface web (W1), smart label web (W2) and back web (W3).
11. A smart label inlet web (W5) comprising a surface film (15), a smart label (12) and a back web (W3) attached to each other, characterized in that the surface film (15) is attached to the smart label (12) by an adhesive which is to be cured by radiation.
12. The smart label inlet web according to claim 11 , characterized in that the surface film (15) is attached to the smart label (12) by means of an adhesive to be crosslinked by ultraviolet radiation or electron beam curing.
13. A smart label card comprising a surface film (15), a smart label (12) and a back film made of a back web (W3), attached to each other, characterized in that the surface film (15) is attached to the smart label (12) by an adhesive which is to be cured by radiation.
14. The smart label card according to claim 13, characterized in that the surface film (15) is attached to the smart label (12) by means of an adhesive to be crosslinked by ultraviolet irradiation or electron beam curing.
PCT/FI2001/000037 2000-01-17 2001-01-16 Method to manufacture a smart label inlet web and a smart label inlet web WO2001054058A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AU28539/01A AU2853901A (en) 2000-01-17 2001-01-16 Method to manufacture a smart label inlet web and a smart label inlet web
EP01942764A EP1249004A1 (en) 2000-01-17 2001-01-16 Method to manufacture a smart label inlet web and a smart label inlet web
JP2001554280A JP2003520666A (en) 2000-01-17 2001-01-16 Method of manufacturing smart label material web and smart label material web
US10/191,968 US20030029540A1 (en) 2000-01-17 2002-07-09 Method for the manufacture of a smart label inlet web, and a smart label inlet web
US11/217,199 US7236093B2 (en) 2000-01-17 2005-09-01 Method for the manufacture of a smart label inlet web, and a smart label inlet web

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20000082 2000-01-17
FI20000082A FI112288B (en) 2000-01-17 2000-01-17 Procedure for producing an input path for smart labels

Related Child Applications (1)

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EP (2) EP1612723A3 (en)
JP (2) JP2003520666A (en)
AU (1) AU2853901A (en)
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US20060032577A1 (en) 2006-02-16
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US20030029540A1 (en) 2003-02-13
FI112288B (en) 2003-11-14
US7236093B2 (en) 2007-06-26
EP1249004A1 (en) 2002-10-16
JP2003520666A (en) 2003-07-08
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JP2006048701A (en) 2006-02-16
EP1612723A3 (en) 2006-01-25

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