CN-122021692-A - Passive NFC tamper-proof strip and state judging and traceability verifying method thereof

CN122021692ACN 122021692 ACN122021692 ACN 122021692ACN-122021692-A

Abstract

The invention discloses a passive NFC tamper strip and a state judging and tracing verification method thereof, and belongs to the technical field of package tamper and logistics tracing. The seal comprises a surface protection layer, a weakening tearing area, a passive NFC anti-dismantling loop, a structural support layer and a disposable adhesive layer, wherein the weakening tearing area is arranged along a preset unsealing direction, the passive NFC anti-dismantling loop is arranged below a position corresponding to the weakening tearing area, so that a conductive line is located in a crack propagation path range, after encapsulation is completed, the passive NFC anti-dismantling loop is read and recorded through an NFC read-write terminal, and when unsealing operation is carried out, the passive NFC anti-dismantling loop loses response capability, reads and judges that the seal is in an unsealed state according to the response capability. The multi-layer composite structure of the anti-disassembly seal can be processed and formed on the existing seal die cutting and laminating production line, and is suitable for disposable packaging scenes such as takeaway food packaging, cold chain food transportation, medicine and medical instrument packaging, valuables consignment and the like.

Inventors

XIONG YILIN
ZENG JIANFEI
QI ZHIQI
WU KE

Assignees

浙江大学

Dates

Publication Date: 20260512
Application Date: 20260127

Claims (9)

1. The passive NFC anti-dismantling seal is characterized by sequentially comprising a surface protection layer, a weakening tearing area, a passive NFC anti-dismantling loop, a structural support layer and a disposable adhesive layer; The surface protection layer is used for covering the outer surface of the seal; the weakening and tearing area is arranged along a preset unsealing direction and is used for guiding cracks to expand along the unsealing direction when the seal is torn; the passive NFC anti-dismantling loop is arranged below the position corresponding to the weakened tearing area, and at least one section of the conductive loop of the passive NFC anti-dismantling loop is overlapped with the crack propagation path; When the seal is unsealed and torn along the weakened tearing area, the crack propagation forms a direct cutting effect on the passive NFC anti-dismantling loop, so that the passive NFC anti-dismantling loop is broken synchronously and loses the response capability, and the unsealing state of the seal is irreversibly judged.
2. The tamper evident seal of claim 1, wherein the weakened tear regions are formed by a partial thinning, a knife mold dashed line, a micro-cut, or a laser etching process.
3. The tamper evident seal of claim 1, wherein the passive NFC tamper evident loop is printed with conductive ink, plated with a conductive layer, or flexible conductive material to form an ultra-thin conductive trace.
4. Tamper evident seal according to claim 1, wherein the conductive loop is routed along the weakened tear region centre line or within 1-3mm of each side thereof.
5. The tamper evident seal of claim 1, wherein the disposable adhesive layer undergoes an unrecoverable structural change after the first application, and the secondary application will produce a fiber break or partial debonding for preventing post-unsealing composite application.
6. The tamper evident seal of claim 1, wherein the structural support layer is disposed below the passive NFC tamper evident loop for maintaining the seal's overall flatness and bending resistance.
7. A method for determining and tracing the state of a passive NFC tamper seal according to any one of claims 1-6, comprising the steps of: s1, establishing unique identification information for the tamper evident strip; S2, tearing off release paper on the outer side of the disposable adhesive layer, and adhering the tamper-proof strip to a sealing position of an object to be packaged, so that the sealing strip spans the sealing boundary and is adhered to bearing surfaces on two sides of the sealing; S3, reading an initial state of the passive NFC anti-disassembly loop through an NFC read-write terminal, recording the initial state as an encapsulation state, and binding the encapsulation state with the unique identification information; S4, when the object is at any verification node, reading the current response state of the passive NFC anti-disassembly loop through an NFC read-write terminal to obtain a reading result; S5, processing node information based on a reading result, judging that the seal is in a closed state and recording node information if the reading is successful and the response is normal, judging that the tamper-evident strip is in an unsealed state or an abnormal state if the reading is failed or abnormal response occurs, generating an unsealing record or an abnormal record, acquiring a last verification node record associated with the unique identification information, and storing the unsealing record or the abnormal record, the last node information and the unique identification information in a combined way; S6, comparing and analyzing based on the unsealing time information, the transportation node information and the historical batch data in the unsealing record or the abnormal record, and outputting a high risk prompt when judging that the unsealing behavior has abnormal risk.
8. The method of claim 7, wherein the unique identification information includes a seal identification, code information associated with an order number, or code information associated with a lot number for matching, storing, and tracing of subsequent read results.
9. The method according to claim 7, wherein the step S5 includes determining that the read result is an abnormal response if one or more of abnormality of read return data, data verification failure, response amplitude reduction or response delay abnormality occurs during the reading process of the NFC read-write terminal, generating an abnormal record, acquiring a last verification node record associated with the unique identification information, and storing the abnormal record, the last node information and the unique identification information in a combined manner.

Description

Passive NFC tamper-proof strip and state judging and traceability verifying method thereof Technical Field The invention belongs to the technical field of packaging anti-disassembly and logistics traceability, and particularly relates to an irreversible anti-disassembly seal based on a passive NFC anti-disassembly loop and a seal unsealing state judging and traceability verification method, in particular to a passive NFC anti-disassembly seal and a state judging and traceability verification method thereof. Background In disposable packaging scenes such as take-out food packaging, cold chain food transportation, medicine and medical instrument packaging, valuables consignment, collection transportation and storage, dangerous chemical sealing, confidential document sealing and the like, in order to prevent illegal opening or midway unpacking in the packaging process, a disposable seal is usually stuck at a sealing position for visually identifying the packaging integrity. Meanwhile, the partial electronic label packaging monitoring scheme adopts an independent sticking NFC or RFID label, the electronic loop and the tearing behavior of the seal material have no fixed corresponding relation, and under the condition that the seal is torn but the electronic label can still be read normally, the problem of inconsistent tamper judgment can occur. Therefore, a technical scheme for packaging and anti-disassembly is needed to establish a linkage relation between the tearing behavior of the seal material and the integrity of the electronic loop, so that the unsealing behavior can be confirmed through the state change of the electronic loop and can be used for subsequent tracing records. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide a passive NFC tamper strip and a state judgment and traceability verification method thereof for realizing physical irreversible damage identification and electronic state confirmation of an opening sealing behavior. In order to achieve the aim, the invention provides the technical scheme that the passive NFC tamper evident strip sequentially comprises a surface protection layer, a weakened tearing area, a passive NFC tamper evident loop, a structural support layer and a disposable adhesive layer; The surface protection layer is used for covering the outer surface of the seal and bearing slight friction, scratch and surface contact impact, so that external microcracks are prevented from directly acting on the inner structure of the seal; the weakening and tearing area is arranged along a preset unsealing direction and is used for guiding cracks to expand along the unsealing direction when the seal is torn; the passive NFC anti-dismantling loop is arranged below the position corresponding to the weakened tearing area, and at least one section of the conductive loop of the passive NFC anti-dismantling loop is overlapped with the crack propagation path; The structure supporting layer is arranged below the passive NFC anti-disassembly loop and is used for maintaining the overall flatness and bending resistance of the seal, sharing external load and keeping the seal stable in the processes of carrying, stacking, transporting and cold chain storage; The disposable adhesive layer is arranged below the structural support layer and is contacted with the sealing surface of the package, so that the seal is fixed at the sealing position; When the seal is unsealed and torn along the weakened tearing area, the crack propagation forms a direct cutting effect on the passive NFC anti-dismantling loop, so that the passive NFC anti-dismantling loop is broken synchronously and loses the response capability, and the unsealing state of the seal is irreversibly judged. Further, the weakened tear regions are formed by localized thinning, die dotted lines, micro-kerfs, or laser etching processes. Further, the passive NFC anti-disassembly loop adopts conductive ink to print, electroplate a conductive layer or flexible conductive material to form an ultrathin conductive line. Further, the conductive loop is routed along the weakened tear region centerline or within 1-3mm of both sides thereof. Further, a release paper (base paper) which can be peeled off is arranged on the outer side of the disposable adhesive layer and is used for protecting the disposable adhesive layer before use, and the release paper is peeled off and then stuck when in use. Further, the disposable adhesive layer is subjected to unrecoverable structural change after first adhesion, and the secondary adhesion action generates fiber breakage or local degumming for preventing the combined adhesion action after unsealing. Furthermore, the suitability of the seal strip structural material can be optimized according to working condition differences of different application environments, namely, in a takeaway food packaging scene, a flexible base material and a medium-strength disposable adhesive layer ar