CN210605769U - Environment-friendly degradable smart card - Google Patents
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- CN210605769U CN210605769U CN201922204331.8U CN201922204331U CN210605769U CN 210605769 U CN210605769 U CN 210605769U CN 201922204331 U CN201922204331 U CN 201922204331U CN 210605769 U CN210605769 U CN 210605769U
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Abstract
The utility model provides an environment-friendly degradable smart card, which comprises a substrate layer, wherein the substrate layer is provided with a mounting groove, a smart chip is embedded in the mounting groove, a printing layer is formed on one surface of the substrate layer, the printing layer is covered with a protective film layer, the substrate layer is made of degradable materials, wherein the substrate layer comprises more than two substrate sublayers, and a first preset adhesive layer is arranged between two adjacent substrate sublayers; and/or a second preset adhesive layer is formed between the printing layer and the base material layer. The utility model discloses a card base main material of smart card all is degradable material, can degrade and can not produce poisonous and harmful substance in natural environment after the smart card is scrapped.
Description
Technical Field
The utility model relates to a smart card technical field especially relates to an use environmental protection degradable smart card that degradable material made.
Background
In the life of people, smart cards, such as bank cards, official cards, membership cards and the like, which are used by people in daily life are commonly used. The existing smart card usually includes a card base, a smart chip is disposed in the card base, and a preset program can be run in the smart chip and user data and the like can be recorded.
Generally, an intelligent card base is made of PVC (polyvinyl chloride) resin, and because the PVC resin contains auxiliary materials such as a plasticizer, an anti-aging agent and the like, which have toxicity and are difficult to recycle, the discarded intelligent card is basically discarded directly, and meanwhile, the PVC resin can be slowly decomposed at high temperature to release hydrogen chloride gas which is harmful to human bodies, so that the environmental problem brought to the society by the intelligent card is a problem which is urgently needed to be solved by the current industry. In addition, the smart card issuing amount in China is very large, the first quarter of 2019 is reached according to data published by the central bank, and the bank card issuing amount in China is 77.73 hundred million cards, which means that all people hold 5.57 cards. Since most smart cards have a lifespan, for example, a credit card usually has a lifespan of only 3 years or 5 years, after the lifespan, a new credit card must be replaced, and how to deal with the scrapped smart card becomes a problem to be considered in the smart card manufacturing industry.
For this reason, some smart card manufacturers currently use environmentally friendly degradable materials to make smart cards, such as polylactic acid (PLA). Polylactic acid is a novel bio-based and biodegradable material made using starch feedstocks extracted from renewable plant resources, such as corn. The starch raw material is saccharified to obtain glucose, the glucose and certain strains are fermented to prepare high-purity lactic acid, and the polylactic acid with certain molecular weight is synthesized by a chemical synthesis method. The biodegradable plastic has good biodegradability, can be completely degraded by microorganisms in the nature under specific conditions after being used, finally generates carbon dioxide and water, does not pollute the environment, is very beneficial to environmental protection, and is a well-known environment-friendly material.
The polylactic acid material has physical and chemical characteristics similar to those of traditional plastics, has good thermal stability and strong solvent resistance, and can be processed in various modes, such as extrusion, spinning, biaxial stretching and injection blow molding. The product made of polylactic acid can be biodegraded, has good biocompatibility, glossiness, transparency, hand feeling and heat resistance, and also has certain antibacterial property, flame retardance and ultraviolet resistance, so the product is a better choice for replacing PVC to be used as an intelligent card.
However, the smart cards currently made using polylactic acid materials have the following problems: firstly, the polylactic acid materials are laminated and combined at the temperature of 130-210 ℃, and the polylactic acid materials are easy to delaminate due to the deformation of the materials under stress; secondly, printing ink is printed on the surface of the polylactic acid material by adopting screen printing or a four-color glue brush, and after lamination, the adhesive force of the printing ink is low, so that the color of the surface of the intelligent card is incomplete. For example, ink can be normally colored when directly printed on the surface of polylactic acid, but the subsequent processing technology needs to laminate each layer of the smart card under the conditions of 120 ℃ to 160 ℃, pressure not lower than 3Mpa and lamination time of 15 to 30 minutes, the ink is easy to delaminate under the technology, and when the smart card is cut, the edge of the smart card is easy to have the problem of separation of the ink and a covering film, namely, the edge bursting phenomenon occurs, which is caused by the reason that the adhesive force of the ink on the surface of the polylactic acid is lower than 1N/cm and the adhesive force is lower. Therefore, the current smart card made of polylactic acid can only be used in the field of membership cards or retail cards, and cannot meet the requirements of the bank card industry.
In addition, because the substrate layer made of the polylactic acid material is often thin, and cannot meet the use requirement of a thick smart card, the substrate layer often needs a multilayer structure if a dual-interface card or a smart card provided with a smart chip. However, if the multilayer substrate layers are directly laminated, the substrate layers are easily separated from each other, resulting in delamination of the smart card.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims at providing an environmental protection degradable smart card.
In order to achieve the main purpose, the utility model provides an environment-friendly degradable smart card comprises a substrate layer, wherein the substrate layer is provided with a mounting groove, a smart chip is embedded in the mounting groove, a printing layer is formed on one surface of the substrate layer, the printing layer is covered with a protective film layer, and the substrate layer is made of degradable materials, wherein the substrate layer comprises more than two substrate sublayers, and a first preset adhesive layer is arranged between two adjacent substrate sublayers; and/or a second preset adhesive layer is formed between the printing layer and the base material layer.
According to the scheme, the printing layer is adhered to the surface of the base material layer through the second preset adhesive, namely, the printing ink used for printing is fixed to the surface of the environment-friendly degradable material such as polylactic acid through the starch-based adhesive.
Preferably, the first preliminary adhesive layer is a starch-based adhesive layer or a synthetic resin adhesive layer, and the second preliminary adhesive layer is a starch-based adhesive layer or a synthetic resin adhesive layer.
The starch-based adhesive is used, on one hand, the starch-based adhesive is made of materials such as rice and corn, and has the advantages of being degradable, non-toxic, harmless and the like, on the other hand, the starch-based adhesive has strong bonding capacity, so that the printing ink can be well bonded to the base material layer, the problem that the printing ink is easy to fade is avoided, and the intelligent card made of polylactic acid can be applied to the field of bank cards.
The synthetic resin adhesive is common artificial synthetic adhesive, has strong adhesive property and can firmly adhere the printing ink to the substrate layer. In addition, the use of the synthetic resin adhesive can reduce the production cost of the smart card because the synthetic resin adhesive is low in cost.
In addition, a first preset adhesive layer is arranged between the sub-layers of the multilayer base material of the base material layer, so that the sub-layers of the multilayer base material have strong adhesive capacity, and the sub-layers of the multilayer base material are prevented from being separated from each other.
Preferably, the substrate sub-layer includes a first substrate layer and a second substrate layer, a first predetermined adhesive layer is formed between the first substrate layer and the second substrate layer, and the smart chip is mounted in the first substrate layer or the second substrate layer.
Therefore, the base material layer is composed of two layers, and the first preset adhesive layer is arranged between the two base material layers, so that the base material layer with larger thickness can be prevented from being manufactured, and the problem that the base material layer is easy to delaminate is avoided. And, be provided with first preset adhesive layer between two-layer substrate layer, avoid the easy problem of layering of two-layer substrate layer.
In an alternative embodiment, the substrate sub-layer includes a first substrate layer, an intermediate layer, and a second substrate layer laminated in this order, a first predetermined adhesive layer is formed between the first substrate layer and the intermediate layer, and a first predetermined adhesive layer is formed between the intermediate layer and the second substrate layer.
Therefore, according to different types of the smart cards, the substrate layer can adopt a three-layer structure, a first preset adhesive layer is arranged between every two adjacent layers, and the use requirements of the smart cards of different types can be met.
The further scheme is that a coil is arranged in the middle layer and electrically connected with the intelligent chip.
Therefore, the antenna is arranged in the middle layer of the non-contact smart card, so that the antenna is hidden in the smart card, the attractiveness of the smart card is not affected, and the antenna is protected.
The printing layer comprises a first printing layer formed on the first surface of the base material layer and a second printing layer formed on the second surface of the base material layer; the protective film layer comprises a first protective film layer formed on the surface of the first printing layer and a second protective film layer formed on the surface of the second printing layer.
Therefore, two protective film layers are respectively formed on the first printing layer and the second printing layer to respectively protect the printing ink of the two printing layers, so that the printing ink is prevented from being damaged.
In a further scheme, the degradable material is at least one of polylactic acid, polyhydroxyalkanoate, poly 3-alkyl butyrate, polymethyl ethylene carbonate, polybutylene succinate, polycaprolactone, polybutylene adipate/terephthalate, polyethylene glycol and acrylate.
The materials are easy to degrade under natural conditions, so that the environment is not polluted, and the environmental protection performance of the smart card is improved.
Drawings
Fig. 1 is a structural diagram of the first embodiment of the environment-friendly intelligent degradable smart card.
Fig. 2 is a sectional view taken along a-a in fig. 1.
Fig. 3 is a cross-sectional view of a second embodiment of the environment-friendly smart degradable smart card of the present invention.
Fig. 4 is a cross-sectional view of a third embodiment of the environment-friendly smart degradable smart card of the present invention.
The present invention will be further explained with reference to the drawings and examples.
Detailed Description
The utility model provides a card base of environmental protection degradable smart card uses environmental protection material to make, and after the smart card was scrapped, the card base of smart card can degrade naturally, does not pollute the environment, is applicable to multiple smart cards such as bank card, bus card, shopping card, membership card.
The first embodiment:
referring to fig. 1, the present embodiment is a contact-type smart card, which has a card base 10, a smart chip 15 embedded in the card base 10, a plurality of electrical contacts 18 disposed on a surface of the smart chip 15, and a plurality of electrical contacts 18 exposed on the surface of the smart card, wherein when the smart card is inserted into a card reading device, the electrical contacts 18 contact with and communicate with the electrical contacts on the card reading device.
Referring to fig. 2, the card base 10 of the present embodiment includes, in order from top to bottom, a first protective film layer 27, a first print layer 26, an adhesive layer 25, a base layer 20, an adhesive layer 28, a second print layer 29, and a second protective film layer 30. The base material layer 20 includes two base material sublayers, namely a first base material layer 21 and a second base material layer 22, and the first base material layer 21 and the second base material layer 22 are bonded by an adhesive layer 23. In this embodiment, the adhesive layer 25 may be a starch-based adhesive layer or a synthetic resin adhesive layer, and similarly, the adhesive layer 28 may be a starch-based adhesive layer or a synthetic resin adhesive layer. As can be seen, the adhesive layer 23 of this embodiment is a first pre-adhesive layer for bonding the two substrate part-layers, while the adhesive layers 25, 28 are second pre-adhesive layers for bonding ink to the substrate layer.
The first substrate layer 21 and the second substrate layer 22 are made of an environmentally friendly degradable material, for example, made of one of polylactic acid (PLA), Polyhydroxyalkanoate (PHA), poly 3-hydroxybutyrate (PLB), polymethylethylene carbonate (PPC), polybutylene succinate (PBS), Polycaprolactone (PCL), polybutylene adipate/terephthalate (PBAT), polyethylene glycol (PEG), and acrylate. Because these materials can degrade in the natural environment to can not produce poisonous harmful substance, after the smart card is scrapped, substrate layer 20 can degrade by oneself, can not cause the destruction to the environment because of using plastics etc..
The first print layer 26 is positioned on one surface of the first base material layer 21, and the first print layer 26 is fixedly adhered to the surface of the first base material layer 21 with an adhesive layer 25. The first printing layer 26 may be printed with ink in a pattern formed on the first base material layer 21, and thus the main component of the first printing layer 26 is ink of each color. The traditional process is to directly coat the ink on the substrate layer, so that the ink cannot be firmly fixed on the substrate layer. In the embodiment, the adhesive layer 25 is formed on the surface of the first substrate layer 21, and the first printing layer 26 is adhered to the surface of the first substrate layer 21 through the adhesive layer 25, so that the ink is not easy to fall off from the first substrate layer 21, and the problem of fading of the smart card is effectively avoided.
The starch-based adhesive can be common materials such as paste, and rice, corn and the like are used as raw materials, and the raw materials are boiled in warm water for a period of time to become sticky, so that the starch-based adhesive has strong adhesive property. In this embodiment, the adhesive layer 25 may be a single layer formed by coating the surface of the first base material layer 21 and then curing the coating with hot air at normal temperature.
The synthetic resin adhesive may be a thermosetting resin adhesive, a thermoplastic resin adhesive, or a hybrid adhesive, and may be a thermosetting adhesive such as phenol, bazaldehyde, melamine, epoxy, polyurethane, unsaturated polyester, silicone resin, or a heterocyclic polymer, a thermoplastic adhesive such as polyvinyl acetate, ethylene-vinyl acetate copolymer, polyvinyl alcohol, polyvinyl acetal, or polyacrylate, or a hybrid adhesive such as phenol-acetal, epoxy-polyamide, epoxy-alum, phenol-butyronitrile, or epoxy-butyronitrile.
A first protective film layer 27 is formed on the surface of the first printing layer 26, in this embodiment, the first protective film layer 27 is made of a transparent film made of an environmentally friendly degradable material, for example, a transparent film made of polylactic acid, and the first protective film layer 27 covers the first printing layer 26 to protect the ink of the first printing layer 26 and prevent the ink from being scratched to damage the local pattern.
A second printed layer 29 is also provided on the surface of the second base material layer 22, and the second printed layer 29 is adhesively fixed to the second printed layer 29 with an adhesive layer 28. The surface of the second printing layer 29 is covered with a second protective film layer 30, and the second protective film layer 30 is also a transparent film made of an environmentally friendly degradable material.
Be provided with the mounting groove in substrate layer 20, intelligent chip 15 can install in the mounting groove, and is preferred, and intelligent chip 15 imbeds in substrate layer 20, and the smart card can be formed through the suppression of current lamination technology. Of course, a flexible circuit board 16 may also be disposed in the substrate layer 20, and the peripheral circuits of the smart chip 15 are integrated in the flexible circuit board 16.
Of course, the smart chip 15 is not necessarily embedded in the first substrate layer 21, and in practical applications, the smart chip 15 may be embedded in the second substrate layer 22.
Second embodiment:
the smart card of the embodiment is a non-contact smart card, i.e. the smart chip does not need to be provided with an electric contact, the smart card is internally provided with a coil for wireless communication, and the communication with the card reading device is realized through the coil.
Referring to fig. 3, the smart card of the present embodiment is provided with a first protective film layer 50, a first printed layer 49, an adhesive layer 48, a base material layer 40, an adhesive layer 51, a second printed layer 52, and a second protective film layer 53 from top to bottom. The base material layer 40 includes three base material sublayers, namely a first base material layer 41, an intermediate layer 42, and a second base material layer 43, an adhesive layer 44 is formed between the first base material layer 41 and the intermediate layer 42, and an adhesive layer 45 is also formed between the intermediate layer 42 and the second base material layer 43. Therefore, the first base material layer 41 and the intermediate layer 42 are fixed to each other with the adhesive layer 44 interposed therebetween, and the intermediate layer 42 and the second base material layer 43 are fixed to each other with the adhesive layer 45 interposed therebetween. In this embodiment, the adhesive layer 44 and the adhesive layer 45 are the first predetermined adhesive layer, and may be a starch-based adhesive layer or a synthetic resin adhesive layer. The adhesive layer 48 and the adhesive layer 51 are a second predetermined adhesive layer, and may be starch-based adhesive layers or synthetic resin adhesive layers.
The first substrate layer 41, the middle layer 42 and the second substrate layer 43 are made of an environmentally friendly degradable material, for example, made of one of polylactic acid (PLA), Polyhydroxyalkanoate (PHA), poly 3-alkyl butyrate (PLB), polymethyl ethylene carbonate (PPC), polybutylene succinate (PBS), Polycaprolactone (PCL), polybutylene adipate/terephthalate (PBAT), polyethylene glycol (PEG) and acrylate.
The first print layer 49 is positioned on one surface of the first base material layer 41, and the first print layer 49 is fixedly adhered to the surface of the first base material layer 41 with an adhesive layer 48. The first printing layer 49 may be printed with ink in a pattern formed on the first base material layer 41, and thus the main component of the first printing layer 49 is ink of each color. In the present embodiment, the adhesive layer 48 is formed on the surface of the first base material layer 41, and the first print layer 49 is adhered to the surface of the first base material layer 41 via the adhesive layer 48, so that the ink is not easily peeled off from the first base material layer 41.
A first protective film layer 50 is formed on the surface of the first printing layer 49, in this embodiment, the first protective film layer 50 is a transparent film made of an environmentally friendly degradable material, for example, a transparent film made of polylactic acid, and the first protective film layer 50 covers the first printing layer 49 to protect the ink of the first printing layer 49, so as to prevent the ink from being scratched to damage the local pattern.
The second printed layer 52 is also provided on the surface of the second base material layer 43, and the second printed layer 52 is fixed to the second printed layer 43 by an adhesive layer 51. The surface of the second printing layer 43 is covered with a second protective film layer 53, and the second protective film layer 53 is also a transparent film made of an environmentally friendly degradable material.
A mounting groove is provided in the substrate layer 40, and the smart chip 55 can be mounted in the mounting groove, preferably, the smart chip 55 is embedded in the middle layer 42, and the smart card can be formed by pressing through an existing laminating process. Since the smart card is a contactless smart card, the smart chip 55 does not need to be provided with electrical contacts exposed on the surface of the smart card. An antenna 56 is also provided in the intermediate layer 42, and the antenna 56 is electrically connected to the smart chip 55. The antenna 56 may be used to receive or transmit wireless signals when the smart card is in proximity to a wireless reader and transmit the received wireless signals to the smart chip 55.
Of course, in practical applications, the smart chip and the antenna are not necessarily both disposed in the middle layer, for example, the smart chip is disposed in the middle layer, and the antenna is disposed on the first substrate layer or the second substrate layer, as long as the smart chip is electrically connected to the antenna.
Third embodiment of environmentally friendly degradable smart card:
the smart card of this embodiment is a dual-interface smart card, and can be used as both a contact smart card and a non-contact smart card, and therefore, the smart chip of the smart card needs to be provided with an electrical contact exposed on the surface of the smart card, and the smart card is also provided with a coil for wireless communication, and communication is achieved with a card reading device through the coil.
Referring to fig. 4, the smart card of the present embodiment is provided with a first protective film layer 69, a first printed layer 68, an adhesive layer 67, a base material layer 60, an adhesive layer 70, a second printed layer 71, and a second protective film layer 72 from the top. The base material layer 60 includes a first base material layer 61, an intermediate layer 62, and a second base material layer 63, an adhesive layer 64 is formed between the first base material layer 61 and the intermediate layer 62, and an adhesive layer 65 is also formed between the intermediate layer 62 and the second base material layer 63. Therefore, the first base material layer 61 and the intermediate layer 62 are fixed to each other with the adhesive layer 64, and the intermediate layer 62 and the second base material layer 63 are fixed to each other with the adhesive layer 65. In this embodiment, the adhesive layer 64 and the adhesive layer 65 are first preliminary adhesive layers, and may be starch-based adhesive layers or synthetic resin adhesive layers, and the adhesive layer 67 and the adhesive layer 70 are second preliminary adhesive layers, and may be starch-based adhesive layers or synthetic resin adhesive layers.
The first substrate layer 61, the middle layer 62 and the second substrate layer 63 are made of an environmentally friendly degradable material, for example, at least one of polylactic acid (PLA), Polyhydroxyalkanoate (PHA), poly 3-alkyl butyrate (PLB), polymethyl ethylene carbonate (PPC), polybutylene succinate (PBS), Polycaprolactone (PCL), polybutylene adipate/terephthalate (PBAT), polyethylene glycol (PEG) and acrylate is used.
The first print layer 68 is positioned on one surface of the first base material layer 61, and the first print layer 68 is fixedly adhered to the surface of the first base material layer 61 with an adhesive layer 67. The first printing layer 68 may be printed with ink in a pattern formed on the first base material layer 61, and thus the main component of the first printing layer 68 is ink of each color. In the present embodiment, the adhesive layer 67 is formed on the surface of the first base material layer 61, and the first print layer 68 is adhered to the surface of the first base material layer 61 via the adhesive layer 67, so that the ink is not easily peeled off from the first base material layer 61.
A first protective film layer 69 is formed on the surface of the first printing layer 68, in this embodiment, the first protective film layer 69 is a transparent film made of an environmentally friendly degradable material, for example, a transparent film made of polylactic acid, and the first protective film layer 69 covers the first printing layer 68 to protect the ink of the first printing layer 68 and prevent the ink from being scratched to damage the local pattern.
A second printed layer 71 is also provided on the surface of the second base material layer 63, and the second printed layer 71 is fixed to the second printed layer 63 by an adhesive layer 70. The surface of the second printing layer 63 is covered with a second protective film layer 72, and the second protective film layer 72 is also a transparent film made of an environmentally friendly degradable material.
A mounting groove is provided in the substrate layer 60, and the smart chip 75 can be mounted in the mounting groove, preferably, the smart chip 75 is embedded in the substrate layer 20, and the smart card can be formed by pressing through an existing laminating process. Of course, a flexible circuit board 76 may be disposed in the substrate layer 60, and the peripheral circuits of the smart chip 75 are integrated in the flexible circuit board 76. Further, an antenna 77 is provided in the intermediate layer 62, and the antenna 77 is electrically connected to the smart chip 75.
It is thus clear that because the substrate layer of smart card, protection film layer all adopt the degradable material of environmental protection to make, the smart card can be degraded and can not the polluted environment under natural environment, and after the smart card was scrapped, the user can be from going to bury the card base landfill of smart card, greatly reduced is because of using the pollution that the smart card caused the environment.
In addition, because the printing ink of printing layer is not directly printed on the surface of substrate layer, but the surface of substrate layer coats starch base adhesive and forms starch base adhesive layer first, then with printing ink spraying on starch base adhesive layer, because starch base adhesive layer is the degradable material too, and starch base adhesive has good adhesive property, through the test, the tensile force of card base can reach 5N/cm, the phenomenon that printing ink and substrate layer separated appears in the smart card, when cutting out the smart card, also the appearance that printing ink drops does not appear, can satisfy the requirement of using as the bank card.
It should be noted that the above is only the preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto, and all the insubstantial modifications made by using the design concept of the present invention also fall within the protection scope of the present invention.
Claims (9)
1. An environmentally degradable smart card comprising:
the intelligent chip comprises a base material layer, a printed layer and a protective film layer, wherein an installation groove is formed in the base material layer, the intelligent chip is embedded in the installation groove, the printed layer is formed on one surface of the base material layer, the protective film layer covers the printed layer, and the base material layer is made of degradable materials;
the method is characterized in that:
the substrate layer comprises more than two substrate sublayers, and a first preset adhesive layer is formed between every two adjacent substrate sublayers; and/or
And a second preset adhesive layer is formed between the printing layer and the base material layer.
2. The environment-friendly degradable smart card of claim 1, wherein:
the base material sublayer comprises a first base material layer and a second base material layer, and the first preset adhesive layer is formed between the first base material layer and the second base material layer.
3. The environment-friendly degradable smart card of claim 2, wherein:
the intelligent chip is installed in the first base material layer or the second base material layer.
4. The environment-friendly degradable smart card of claim 1, wherein:
the substrate sub-layer includes a first substrate layer, an intermediate layer, and a second substrate layer laminated in this order, the first predetermined adhesive layer is formed between the first substrate layer and the intermediate layer, and the first predetermined adhesive layer is formed between the intermediate layer and the second substrate layer.
5. The environment-friendly degradable smart card of claim 4, wherein:
and a coil is arranged in the middle layer and is electrically connected with the intelligent chip.
6. The environment-friendly degradable smart card according to any one of claims 1 to 5, wherein:
the printing layer comprises a first printing layer formed on the first surface of the base material layer and a second printing layer formed on the second surface of the base material layer;
the protective film layer comprises a first protective film layer formed on the surface of the first printing layer and a second protective film layer formed on the surface of the second printing layer.
7. The environment-friendly degradable smart card of claim 1, wherein:
the degradable material is one of polylactic acid, polyhydroxyalkanoate, poly 3-alkyl butyrate, polymethyl ethylene carbonate, polybutylene succinate, polycaprolactone, polybutylene adipate/terephthalate, polyethylene glycol and acrylate.
8. The environment-friendly degradable smart card according to any one of claims 1 to 5, wherein:
the first preset adhesive layer is a starch-based adhesive layer or a synthetic resin adhesive layer.
9. The environment-friendly degradable smart card according to any one of claims 1 to 5, wherein:
the second preset adhesive layer is a starch-based adhesive layer or a synthetic resin adhesive layer.
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| CN113043693A (en) * | 2021-03-19 | 2021-06-29 | 金邦达有限公司 | Double-interface smart card and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113043693A (en) * | 2021-03-19 | 2021-06-29 | 金邦达有限公司 | Double-interface smart card and manufacturing method thereof |
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