Plastic metal film capable of transmitting radio frequency signal and preparation method and application thereof

Abstract

The invention discloses a plastic metal film capable of transmitting radio frequency signals and a preparation method and application thereof, and the preparation method comprises the following steps: forming a metal ink layer on the surface of a plastic film substrate to obtain a plastic film substrate loaded with metal ink; performing ultrasonic treatment on the plastic film base material loaded with the metal ink; and heating and air-drying the ultrasonic-treated plastic film substrate loaded with the metal ink to obtain the plastic metal film capable of transmitting the radio-frequency signal. The prepared plastic metal film not only has a surface visual effect similar to that of an evaporation film, but also does not shield a radio frequency signal, and the RFID tag can be identified through the radio frequency signal no matter the RFID tag is pasted on the inner surface or the outer surface of a finished bag or when the RFID tag is packed or stacked together; in addition, the preparation method of the plastic metal film is simple in process, low in cost and easy to popularize and apply.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic metal films, and particularly to a plastic metal film capable of transmitting radio frequency signals, a preparation method thereof, and an application thereof. Background Art

[0002] Radio Frequency Identification (RFID) is a type of automatic identification technology. It performs non-contact two-way data communication via radio frequency, reads and writes a recording medium (electronic tag or radio frequency card) using radio frequency, so as to achieve the purpose of identifying targets and data exchange. It is considered to be one of the most promising information technologies in the 21st century. With the wide application of Radio Frequency Identification (RFID) technology in various fields, more and more enterprises have started to apply RFID technology to food packaging to realize the tracking, management, and traceability of product information.

[0003] Currently, the metal layers of the main plastic metal composite films for food packaging on the market are made by aluminizing or laminating aluminum foil. The plastic metal films made by these processes cannot transmit radio frequency signals. For plastic metal film products with RFID function requirements, only anti-metal labels can be pasted on the packaging surface to solve the problem that the metal composite film cannot transmit radio frequency signals. However, the production of anti-metal RFID labels is complex and costly. In addition, the anti-metal RFID label can only read the signal when the product is unobstructed. After the product is packed in boxes or stacked in piles, since the aluminum layer blocks the radio frequency signal of the anti-metal RFID label, the RFID label still cannot be read.

[0004] In view of this, the present invention is specifically proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide a plastic metal film capable of transmitting radio frequency signals, a preparation method thereof, and an application thereof. The plastic metal film prepared by the present invention not only has a surface visual effect similar to that of an evaporated film, but also does not shield radio frequency signals. Whether the RFID label is pasted on the inner or outer surface of the finished bag, it can transmit radio frequency signals for identification when packed in boxes or stacked together.

[0006] In order to achieve the above object of the present invention, the following technical solutions are specifically adopted:

[0007] In the first aspect of the present invention, a preparation method of a plastic metal film capable of transmitting radio frequency signals is provided. The preparation method includes the following steps:

[0008] (a) Form a metal ink layer on the surface of a plastic film substrate to obtain a plastic film substrate loaded with metal ink;

[0009] (b) Ultrasonically treat the plastic film substrate loaded with metal ink;

[0010] (c) Heat and air-dry the ultrasonically treated plastic film substrate loaded with metal ink to obtain the plastic metal film capable of transmitting radio frequency signals.

[0011] Preferably, in the step (a), the formation method of forming the metal ink layer on the surface of the plastic film substrate is printing, coating or spraying.

[0012] Preferably, in the step (a), the thickness of the metal ink layer is 0.8 - 5 μm.

[0013] Preferably, in the step (b), the ultrasonic treatment power is 100 - 5000 W and the time is 0.1 - 0.5 s.

[0014] Preferably, in the step (c), the temperature of heat air-drying is 60 - 110 °C.

[0015] Preferably, in the step (a), the metal ink is silver powder ink, aluminum powder ink, copper powder ink, tin powder ink or nickel powder ink.

[0016] Preferably, in the step (a), the thickness of the plastic film substrate is 5 - 50 μm and the material is APET, PET, BOPP or OPP.

[0017] The second aspect of the present invention provides a plastic metal film capable of transmitting radio frequency signals prepared by the above preparation method.

[0018] The third aspect of the present invention provides an application of the plastic metal film capable of transmitting radio frequency signals prepared by the above preparation method in food packaging.

[0019] Compared with the prior art, the beneficial effects of the present invention at least include:

[0020] The plastic metal film prepared by the present invention not only has a surface visual effect similar to that of an evaporated film, but also does not shield radio frequency signals. Whether the RFID tag is pasted on the inner or outer surface of the finished bag, it can be identified by transmitting radio frequency signals when packed or stacked together; in addition, the preparation method of the plastic metal film of the present invention has a simple process, low cost and is easy to popularize and apply. Detailed Embodiments

[0021] The following will describe in detail the embodiments of the technical solutions of the present invention in combination with the embodiments. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention, so they are only examples and cannot be used to limit the protection scope of the present invention.

[0022] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application shall have the ordinary meanings understood by those skilled in the art to which the present invention pertains.

[0023] An embodiment of the present invention provides a method for preparing a plastic-metal film that can transmit radio frequency signals. The preparation method includes the following steps:

[0024] (a) Form a metal ink layer on the surface of a plastic film substrate to obtain a plastic film substrate loaded with metal ink;

[0025] (b) Perform ultrasonic treatment on the plastic film substrate loaded with metal ink;

[0026] (c) Heat and air-dry the plastic film substrate loaded with metal ink after ultrasonic treatment to obtain the plastic-metal film that can transmit radio frequency signals.

[0027] The plastic-metal film prepared by the present invention not only has a surface visual effect similar to that of an evaporated film, but also does not shield radio frequency signals. Whether the RFID tag is attached to the inner or outer surface of the finished bag, it can be identified through radio frequency signals when packed or stacked together; in addition, the preparation method of the plastic-metal film of the present invention has a simple process, low cost, and is easy to promote and apply.

[0028] In one embodiment, in the step (a), the forming method of forming the metal ink layer on the surface of the plastic film substrate is printing, coating, or spraying.

[0029] In one embodiment, in the step (a), the thickness of the metal ink layer can be any value in the range of 0.8 to 5 μm.

[0030] In one embodiment, in the step (b), the ultrasonic treatment power can be 100 to 5000 W, and the treatment time can be any time in the range of 0.1 to 0.5 s.

[0031] In one embodiment, in the step (c), the temperature of heat and air-drying can be any value in the range of 60 to 110 °C.

[0032] In one embodiment, in the step (a), the metal ink can be silver powder ink, aluminum powder ink, copper powder ink, tin powder ink, or nickel powder ink.

[0033] In one embodiment, in the step (a), the thickness of the plastic film substrate can be any value in the range of 5 to 0 μm, and the material can be APET, PET, BOPP, or OPP.

[0034] Another embodiment of the present invention provides a plastic-metal film that can transmit radio frequency signals prepared by the above preparation method.

[0035] Another embodiment of the present invention provides an application of a plastic-metal film capable of transmitting radio frequency signals prepared by the above preparation method in food packaging.

[0036] The technical solution of the present invention will be described in detail through specific embodiments below.

[0037] The raw materials used in the following embodiments are as follows:

[0038] Plastic film substrate: with a thickness of 10 μm, made of APET, commercially available;

[0039] Metal ink: silver powder ink; commercially available.

[0040] Example 1

[0041] This example is a preparation method of a plastic-metal film capable of transmitting radio frequency signals. The preparation method includes the following steps:

[0042] (a) Printing the metal ink onto the surface of the plastic film substrate by printing to form a metal ink layer, obtaining a plastic film substrate loaded with metal ink, wherein the thickness of the metal ink layer is 0.8 μm;

[0043] (b) Ultrasonically treating the plastic film substrate loaded with metal ink, wherein the ultrasonic treatment temperature is 100 W and the time is 0.5 s;

[0044] (c) Heating and air-drying the ultrasonically treated plastic film substrate loaded with metal ink at 60 °C to obtain the plastic-metal film capable of transmitting radio frequency signals.

[0045] Example 2

[0046] This example is a preparation method of a plastic-metal film capable of transmitting radio frequency signals. The preparation method includes the following steps:

[0047] (a) Printing the metal ink onto the surface of the plastic film substrate by printing to form a metal ink layer, obtaining a plastic film substrate loaded with metal ink, wherein the thickness of the metal ink layer is 5 μm;

[0048] (b) Ultrasonically treating the plastic film substrate loaded with metal ink, wherein the ultrasonic treatment temperature is 1000 W and the time is 0.1 s;

[0049] (c) Heating and air-drying the ultrasonically treated plastic film substrate loaded with metal ink at 110 °C to obtain the plastic-metal film capable of transmitting radio frequency signals.

[0050] Example 3

[0051] This embodiment is a preparation method of a plastic-metal film that can transmit radio frequency signals. The preparation method includes the following steps:

[0052] (a) Print metal ink on the surface of a plastic film substrate by printing to form a metal ink layer, obtaining a plastic film substrate loaded with metal ink. Among them, the thickness of the metal ink layer is 2 μm;

[0053] (b) Perform ultrasonic treatment on the plastic film substrate loaded with metal ink. Among them, the ultrasonic treatment temperature is 500 W and the time is 0.3 s;

[0054] (c) Heat and air-dry the plastic film substrate loaded with metal ink after ultrasonic treatment at 80 °C to obtain the plastic-metal film that can transmit radio frequency signals.

[0055] Experimental Example

[0056] Use an RFID reading device to aim at a passive RFID UHF tag covered with a metal film and perform reading. Those with signals are metal films that can transmit radio frequency signals, and those without signals are metal films that cannot transmit radio frequency signals; Use this method to detect whether the plastic-metal films prepared in the above Examples 1-3 can transmit radio frequency signals;

[0057] The test results show that the plastic-metal films prepared in the above Examples 1-3 can all transmit radio frequency signals.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: They can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the description of the present invention.

Claims

1. A method for preparing a plastic metal film that can transmit radio frequency signals, characterized in that: The preparation method comprises the following steps: (a) forming a metal ink layer on the surface of a plastic film substrate to obtain a plastic film substrate loaded with metal ink; (b) subjecting the plastic film substrate loaded with the metal ink to ultrasonic treatment; (c) heating and air-drying the plastic film substrate loaded with the metal ink after the ultrasonic treatment to obtain the plastic metal film that can transmit radio frequency signals.

2. The preparation method according to claim 1, characterized in that: In the step (a), the metal ink layer is formed on the surface of the plastic film substrate by printing, coating or spraying.

3. The preparation method according to claim 1, characterized in that: In the step (a), the thickness of the metal ink layer is 0.8 to 5 μm.

4. The preparation method according to claim 1, characterized in that: In the step (b), the ultrasonic treatment power is 100 to 5000 W, and the time is 0.1 to 0.5 s.

5. The preparation method according to claim 1, characterized in that: In the step (c), the temperature of heating and air drying is 60 to 110°C.

6. The preparation method according to claim 1, characterized in that: In the step (a), the metal ink is silver powder ink, aluminum powder ink, copper powder ink, tin powder ink or tweezers powder ink.

7. The preparation method according to claim 1, characterized in that: In the step (a), the plastic film substrate has a thickness of 5 to 50 μm and is made of APET, PET, BOPP or OPP.

8. The plastic metal film capable of transmitting radio frequency signals obtained by the preparation method according to any one of claims 1 to 7.

9. Use of the plastic metal film capable of transmitting radio frequency signals obtained by the preparation method according to any one of claims 1 to 7 in food packaging.