A rapid surface plasma sterilization device for food packaging materials

Abstract

The present invention discloses a surface plasma rapid disinfection device for food packaging materials, which relates to the technical field of disinfection devices and includes two sub-modules arranged in the front-rear direction with the same structure; there is a gap between the two sub-modules; each sub-module includes a fixed seat, a sealing cover, a dielectric plate and a circuit board; an electrode material is provided on one side of the dielectric plate, and the electrode material is electrically connected to a high-voltage power supply. A ground electrode wire is provided on the other side of the dielectric plate, and the ground electrode wire is electrically connected to the circuit board; the dielectric plate and the circuit board are arranged in the fixed seat, the sealing cover is located on the side of the fixed seat away from the gap, and the ground electrode wire is located on the side close to the gap. It can effectively and rapidly disinfect bacteria and viruses on the outer surface of food handle materials at high speed, and has high efficiency. The raw materials required are water and air, and the raw materials are clean and pollution-free. By controlling the flow rate of water droplets through a peristaltic pump, the internal air humidity can be effectively and accurately controlled to achieve efficient sterilization treatment. The plasma reactor has a simple structure and is convenient for installation and maintenance.

Description

Technical Field

[0001] The present invention relates to the technical field of disinfection devices, and particularly to a rapid surface plasma disinfection device for food packaging materials. Background Art

[0002] China is a large food country with a wide variety of foods. With the development of China and the increasingly mature technology and powerful scale of the food processing industry, people's awareness and demand for health and food safety have become increasingly strong. Most of the foods purchased on the market are finished products packaged, so the safety issue of the surface of food outer packaging has also become a major issue that needs attention and full resolution. Therefore, the detection of food outer packaging is of great significance.

[0003] Taking cheese packaging as an example, cheese packaging includes both the packaging material outside the cheese and the stick handle. However, during the processing of the packaging material and the stick handle, they will come into contact with the outside world and are very likely to contact viruses and bacteria, causing contamination to the food. Therefore, it is extremely important to disinfect bacteria and viruses during the production process of food packaging materials.

[0004] With the development of plasma technology, the application of plasma technology has become more and more extensive. In the past decade, the technology of using plasma to sterilize has set off a global upsurge. Using plasma technology to sterilize indeed has very important application value. This sterilization method has low cost, simple equipment, high sterilization efficiency, and will not produce secondary pollution after treatment. During the generation of plasma, a series of chemical reactions will occur, and then reactive oxygen free radicals will be generated, such as hydroxyl radicals, ozone, nitrogen oxides and other reactive free radicals, and these free radicals can be used for the inactivation of microorganisms on the surface of cheese packaging materials on a large scale. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides a rapid surface plasma disinfection device for food packaging materials, which is used for disinfecting food packaging materials.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides a rapid surface plasma disinfection device for food packaging materials, including two sub-modules arranged in the front-back direction with the same structure; there is a gap between the two sub-modules; each sub-module includes a fixed seat, a sealing cover, a dielectric plate and a circuit board; an electrode material is arranged on one side of the dielectric plate, and the electrode material is electrically connected to a high-voltage power supply. A ground electrode wire is arranged on the other side of the dielectric plate, and both ends of the ground electrode wire are electrically connected to the circuit board; the dielectric plate and the circuit board are both arranged in the fixed seat, the sealing cover is located on the side of the fixed seat away from the gap, and the ground electrode wire is located on the side close to the gap.

[0008] Optionally, the electrode material is electrically connected to the high-voltage power supply through a high-voltage wire.

[0009] Optionally, the electrode material is a metal foil.

[0010] Optionally, the voltage of the high-voltage power supply is 7-21 KV, and the operating frequency is 10 KHZ.

[0011] Optionally, a slot is provided on the other side of the dielectric plate, and the ground electrode wire is disposed in the slot.

[0012] Optionally, the dielectric plate is an insulating material plate.

[0013] Optionally, the dielectric plate is a ceramic plate, a PCB board, a quartz plate or a polyimide.

[0014] Optionally, water tanks are provided on both sides of the fixing seat, and an inlet and an outlet are provided on the water tanks; the inlet is communicated with a water injection tank, and the outlet is communicated with a waste water tank; a pump is provided between the water injection tank and the inlet.

[0015] Optionally, the water flow rate in the water tank is 20-50 ml / min.

[0016] Optionally, a plurality of blowers are provided on the sealing cover.

[0017] The present invention has achieved the following technical effects compared with the prior art:

[0018] Sterilization is carried out based on the active substances in the surface dielectric barrier discharge plasma. Since these active substances have strong chemical activity and a long half-life, they can undergo biochemical reactions with bacteria, fungi or viruses on the surface of the packaging material, kill them, and destroy the integrity of their membranes and then their structures. The generation of reactive oxygen species and reactive nitrogen species is an important factor required for sterilization; in the present invention, the ground electrode wires are uniformly arranged on the surface of the dielectric plate, and the distance between each wire is very small, which can generate large-area uniform discharge and reduce the surface temperature; and the fixing method of the metal wire is fixed by PCB circuit boards placed parallel to the surface of the dielectric plate at both ends of the metal wire to ensure that the metal wire is straightened and not bent; a little water is introduced into the device to provide a humid environment for the plasma generation area. Air and water molecules are ionized and a series of chemical reactions will generate oxidation species such as peroxynitrous acid, improving the surface sterilization efficiency; in addition, the large-area packaging materials to be processed can be processed in a moving manner inside the device, and both the front and back surfaces can be processed.

[0019] The surface plasma rapid disinfection device for food packaging materials in the present invention can effectively and rapidly disinfect bacteria and viruses on the outer surface of food handle materials, and has a relatively high disinfection efficiency. The raw materials required for the plasma reaction device are water and air, and the reaction raw materials are clean and pollution-free. By controlling the flow rate of raw material water droplets in the reactor with a peristaltic pump, the internal air humidity can be effectively and accurately controlled to achieve efficient sterilization treatment. The plasma reactor has a simple structure and is convenient for installation and maintenance. Brief Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a schematic structural diagram of sub-modules in the surface plasma rapid disinfection device for food packaging materials of the present invention;

[0022] Figure 2 It is a schematic inner structure diagram of sub-modules in the surface plasma rapid disinfection device for food packaging materials of the present invention;

[0023] Figure 3 It is a schematic side structure diagram of the surface plasma rapid disinfection device for food packaging materials of the present invention;

[0024] Figure 4 It is a schematic structural diagram of the dielectric plate in the surface plasma rapid disinfection device for food packaging materials of the present invention;

[0025] Figure 5 It is a schematic structural diagram of the circuit board in the surface plasma rapid disinfection device for food packaging materials of the present invention;

[0026] Figure 6 It is a schematic structural diagram of the fixing seat in the surface plasma rapid disinfection device for food packaging materials of the present invention;

[0027] Figure 7 It is a curve graph of experimental result data of the surface plasma rapid disinfection device for food packaging materials of the present invention.

[0028] Explanation of the reference numerals in the drawings: 1. Fixing seat; 2. Sealing cover; 3. Fan; 4. Circuit board; 5. Dielectric plate; 6. Ground electrode wire; 7. Gap; 8. Water tank; 9. Guide plate fixing groove; 10. Water inlet; 11. Water outlet. Detailed Embodiments

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] As Figures 1 to 7 shown, this embodiment provides a surface plasma rapid disinfection device for food packaging materials, which includes two sub-modules arranged in the front-rear direction with the same structure; there is a gap 7 between the two sub-modules; the sub-module includes a fixed seat 1, a sealing cover 2, a dielectric plate 5 and a circuit board 4; an electrode material is arranged on one side of the dielectric plate 5, and the electrode material is electrically connected to a high-voltage power supply. A ground electrode wire 6 is arranged on the other side of the dielectric plate 5, and both ends of the ground electrode wire 6 are electrically connected to one of the circuit boards 4; the dielectric plate 5 and the circuit board 4 are both arranged in the fixed seat 1, the sealing cover 2 is located on the side of the fixed seat 1 away from the gap 7, and the ground electrode wire 6 is located on the side close to the gap 7.

[0031] In this specific embodiment, the electrode material is electrically connected to the high-voltage power supply through a high-voltage wire. The electrode material is copper foil. The voltage of the high-voltage power supply is 7-21 KV, and the working frequency is 10 KHZ.

[0032] A slot is arranged on the other side of the dielectric plate 5, and the ground electrode wire 6 is arranged in the slot. The dielectric plate 5 is made of ceramic, with a length of 340 mm - 380 mm, a width of 180 mm - 220 mm, and a thickness of 2 mm. The dielectric plate 5 has a slot with a depth of 0.3 mm and a width of 0.6 mm, and the distance between the slots is 4 mm. The ground electrode wire 6 is a filamentous or mesh-shaped steel, tungsten or silver metal and is embedded in the slot of the dielectric plate 5.

[0033] The dielectric plate 5 is a ceramic plate.

[0034] Water tanks 8 are arranged on both sides of the fixed seat 1, and an inlet 10 and an outlet 11 are arranged on the water tanks 8; the inlet 10 is communicated with a water injection tank, and the outlet 11 is communicated with a waste water tank; a peristaltic pump is arranged between the inlet 10 and the water injection tank, and the water flow speed in the water tank 8 is 20 - 50 ml / min.

[0035] A plurality of fans 3 are arranged on the sealing cover 2. The fans 3 can be arranged on both sides of the sealing cover 2 or on the end face of the sealing cover 2. The fans 3 are fixed to the sealing cover 2 through stainless steel or aluminum alloy brackets.

[0036] The sealing cover 2 and the fixed seat 1 are made of aluminum alloy.

[0037] During use, the processing material freely falls downward by gravity. The power supply outputs a voltage of 7 - 21 kV, and the discharge frequency is 10 kHz. Plasma is generated at the ground electrode wire 6 and the dielectric plate 5. The temperature in the plasma reactor space is high, causing the water droplets in the water tank 8 to volatilize and generating a humid air environment. Discharging to generate plasma in the humid air environment can rapidly disinfect bacteria and viruses on the surface of the handle material within a short time. Additionally, during the use of the reactor, the user needs to power on the fan to achieve heat dissipation on the high-voltage electrode and the dielectric plate 5.

[0038] The following will describe in detail the surface plasma rapid disinfection device for food packaging materials in this embodiment with reference to the accompanying drawings and more specific embodiments.

[0039] Example 1:

[0040] A method for rapidly disinfecting the surface of cheese packaging material is as follows:

[0041] Connect the high-voltage wire led out from the inside of the device to the high-voltage power supply, and ground the device. The water inside the water injection tank flows into the inside of the device through a water pipe, and the water flow rate entering the device is controlled by adjusting the peristaltic pump. The fan 3 operates normally, the high-voltage power supply is turned on, and the device is preheated for 1 minute. The packaging material to be processed is sent into the device from the small gap 7 left between the upper side of the device, i.e., the fixed seats 1, and the front and back surfaces of the packaging material are processed by an automated machine. After 10 s, the processing is completed and it is sent out from the bottom outlet of the device.

[0042] Example 2:

[0043] Ten groups of 1x1 cm 2 bacterial tablets containing Escherichia coli were prepared and placed on the ground electrode wire 6 to be directly contacted with the plasma for treatment: The first group of bacterial tablets was treated under an applied voltage of 7 kV; the second group of bacterial tablets was treated under an applied voltage of 9 kV; the third group of bacterial tablets was treated under an applied voltage of 11 kV; the fourth group of bacterial tablets was treated under an applied voltage of 13 kV; the fifth group of bacterial tablets was treated under an applied voltage of 15 kV; the sixth group of bacterial tablets was treated under an applied voltage of 17 kV; the seventh group of bacterial tablets was treated under an applied voltage of 19 kV; the eighth group of bacterial tablets was treated under an applied voltage of 20 kV; the ninth group of bacterial tablets was treated under an applied voltage of 21 kV; the tenth group of bacterial tablets was used as a control group and was not treated at all. Each group of bacterial tablets was taken out after 10 s of plasma treatment, and placed in a centrifuge tube containing 2 mL of sterile water to wash the bacteria off the bacterial tablets. Finally, 300 μL of the liquid was taken out from each 2 mL of the bacterial solution and spread on the culture medium, and placed in an incubator for overnight culture, and then observed, as Figure 7As shown, when the applied voltage is 13 kV, the logarithmic decay value of the bacterial count on the bacterial sheet after plasma treatment has reached the maximum. It can be seen that the plasma generated by surface discharge in humid air can inactivate surface bacteria efficiently in a short time, and the higher the applied voltage, the more obvious the effect.

[0044] It should be noted that for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention, and any reference signs in the claims should not be regarded as limiting the claimed rights.

[0045] In this specification, specific examples are used to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A rapid surface plasma sterilization device for food packaging materials, characterized in that, It includes two sub-modules with the same structure arranged in the front-back direction; there is a gap between the two sub-modules; each sub-module includes a fixed seat, a sealing cover, a dielectric plate and a circuit board; on one side of the dielectric plate, there is electrode material which is electrically connected to a high-voltage power supply, on the other side of the dielectric plate, there is a ground electrode wire, and both ends of the ground electrode wire are respectively electrically connected to one of the circuit boards. The circuit board is placed parallel and coplanar with the surface of the dielectric plate, and the circuit board is used to ensure that the ground electrode wire is straightened and not bent; the dielectric plate and the circuit board are both arranged in the fixed seat, the sealing cover is located on the side of the fixed seat away from the gap, and the ground electrode wire is located on the side close to the gap; On both sides of the fixed seat, there are water tanks, and on the water tanks, there are water inlets and water outlets; the water inlets are communicated with a water injection tank, and the water outlets are communicated with a waste water tank; there is a pump arranged between the water injection tank and the water inlets; On the other side of the dielectric plate, there is a slot, and the ground electrode wire is arranged in the slot.

2. The surface plasma rapid disinfection device for food packaging materials according to claim 1, characterized in that, The electrode material is electrically connected to the high-voltage power supply through a high-voltage wire.

3. The surface plasma rapid disinfection device for food packaging materials according to claim 1, wherein The electrode material is a metal foil.

4. The surface plasma rapid disinfection device for food packaging materials according to claim 1, characterized in that The voltage of the high-voltage power supply is 7 - 21 KV, and the working frequency is 10 KHZ.

5. The surface plasma rapid disinfection device for food packaging materials according to claim 1, wherein The dielectric plate is an insulating material plate.

6. The surface plasma rapid disinfection device for food packaging materials according to claim 1, wherein, The dielectric plate is a ceramic plate, a PCB board, a quartz plate or a polyimide.

7. The surface plasma rapid disinfection device for food packaging materials according to claim 1, wherein The water flow rate in the water tank is 20 - 50 ml / min.

8. The surface plasma rapid disinfection device for food packaging materials according to claim 1, characterized in that, There are multiple fans arranged on the sealing cover.

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