Method and device for sterilizing inner wall and outer wall of empty bottle by hypochlorous acid / iodine / persulfate enhanced plasma

Abstract

The invention provides a method and device for sterilizing the inner wall and the outer wall of an empty bottle through hypochlorous acid / iodine solution / persulfate enhanced plasma, and relates to the fields of liquid food, beverages, drinks and the like. According to the sterilization cavity, the sterilization cavity is combined with hypochlorous acid, iodine liquid and persulfate through plasmas, and microorganisms on the surfaces of the inner wall and the outer wall of an empty bottle are killed. The method combines the broad-spectrum sterilization capabilities of plasma, hypochlorous acid, iodine solution and persulfate, realizes efficient and comprehensive sterilization of empty bottles, is especially suitable for sterilization of packaging materials in the industries of beverages, milk, wine and the like, and can also be suitable for sterilization of the surfaces of other objects when a nozzle is not opened.

Description

Technical Field

[0001] The present invention relates to the technical field of bottle disinfection, and specifically, to a method and device for sterilizing the inner and outer walls of empty bottles by using hypochlorous acid / iodine / persulfate enhanced plasma. The method and device combine the broad-spectrum sterilization characteristics of hypochlorous acid / iodine / persulfate plasma to achieve efficient and comprehensive disinfection of the inner and outer walls of the bottle. Background Art

[0002] With the development of society and the improvement of human living standards, people pay more and more attention to food safety. Plasma, as an emerging disinfection technology, has played an important role in the disinfection field of all walks of life. The traditional way to disinfect bottles is to use ultraviolet rays and steam hydrogen peroxide to disinfect the bottles. This treatment method has disadvantages such as residual hydrogen peroxide, long disinfection time, and high hydrogen peroxide consumption. It has gradually failed to meet the needs of enterprises in bottle filling. Plasma has the characteristics of green, efficient and pollution-free, and gradually replaces traditional disinfection methods. Bottles are carriers of different nutrients. With the popularity of bottles and the convenience of drinking, they are becoming more and more popular in people's lives. The disinfection of bottles is directly related to the public's food safety. Therefore, it is extremely important to develop an efficient, green and safe disinfection method to disinfect the inner and outer walls of bottles. Summary of the invention

[0003] In order to solve the shortcomings of the current steam hydrogen peroxide method in the sterilization process of the bottle, such as residual hydrogen peroxide, long sterilization time, and large hydrogen peroxide consumption, which have gradually failed to meet the needs of enterprises in bottle filling, the present invention proposes a sterilization method and device for the inner and outer walls of empty bottles by using hypochlorous acid / iodine / persulfate enhanced plasma. The present invention mainly utilizes the plasma generated by discharge ionized air and hypochlorous acid / iodine / persulfate to achieve the effect of completely killing the inner and outer walls of the bottle with little residual amount. The chemically active groups (such as hydrogen peroxide, hydroxyl radicals, etc.) generated by the plasma can activate hypochlorous acid / iodine / persulfate into active chlorine (chlorine gas, hypochlorite) / active iodine (triiodide anion) / active sulfur (sulfate radical, permonosulfate). The present invention utilizes an active particle formed by hypochlorous acid / iodine solution / persulfate enhanced plasma, which can achieve rapid and efficient sterilization of the inner and outer walls of the bottle, so it can have important use value in the process of empty bottle filling.

[0004] The technical means adopted in the present invention are as follows:

[0005] A method for sterilizing the inner and outer walls of empty bottles by using hypochlorous acid / iodine / persulfate enhanced plasma, wherein a plasma discharge device in a disinfection chamber discharges, and a hypochlorous acid / iodine / persulfate solution is brought into the disinfection chamber by the discharge gas and then activated by the plasma discharge device, ultimately generating abundant air-hypochlorous acid / iodine / hypochlorite-plasma active particles, and gas circulation is achieved through a fan to improve the spatial uniformity of the active particles in the disinfection chamber; when the discharge reaches stability, that is, the temperature reaches greater than or equal to 70°C, preferably in the range of 70°C-150°C, the empty bottles to be treated that are lower than the temperature of the disinfection chamber are placed in the disinfection chamber, and the active particles are injected into the low-temperature empty bottles to be treated by a nozzle, forming a uniform water film on the inner and outer walls of the empty bottles, and then the inner and outer walls of the empty bottles are disinfected by the active particles. In addition to the active particles directly generated by the plasma, the water film also contains iodine, hypochlorite, persulfate, etc., which act together with pathogenic microorganisms at a certain temperature, thereby enhancing the sterilization effect of the plasma on the inner and outer walls of the empty bottles;

[0006] The hypochlorous acid / iodine / persulfate solution is a hypochlorous acid solution, a persulfate solution, or a mixed solution of a hypochlorous acid solution and an iodine solution.

[0007] Furthermore, the disinfection time of the empty bottles to be processed is 7-12s, preferably 10-12s.

[0008] Furthermore, a plasma discharge device in the disinfection chamber discharges to generate plasma, and after 0-5 minutes of discharge, a discharge gas containing hypochlorous acid / iodine solution / persulfate is introduced into the disinfection chamber and activated by the discharge device.

[0009] Furthermore, the empty bottles to be processed whose temperature is lower than the temperature of the disinfection chamber are transferred into the disinfection chamber through a conveyor belt, and the empty bottles to be processed are pulled under the nozzle by an automatic telescopic device.

[0010] Furthermore, the distance between the nozzle opening of the nozzle and the bottom of the empty bottle after being pulled by the automatic telescopic device is 1 / 2 height of the empty bottle or less.

[0011] Furthermore, the persulfate may be sodium persulfate, ammonium persulfate, potassium persulfate, or the like.

[0012] Further, the concentration of the iodine solution is >0.005 mol / L, the concentration of the hypochlorous acid solution is >0.005 mol / L, and the concentration of the persulfate solution is >0.005 mol / L. For example, the volumes of the iodine solution, hypochlorous acid, and persulfate solution are all 200 mL.

[0013] Furthermore, the flow rate of the discharge gas is greater than or equal to 10 ml / min, preferably 10 ml / min-30 L / min.

[0014] Furthermore, the flow rate of the gas ejected from the nozzle is 0.6-4m / s.

[0015] Furthermore, the empty bottle is a bottle made of glass, plastic or other materials.

[0016] A hypochlorous acid / iodine liquid / persulfate enhanced plasma sterilization device for the inner and outer walls of an empty bottle, comprising a sterilization cavity and a hypochlorous acid / iodine / persulfate storage tank, wherein the hypochlorous acid / iodine / persulfate storage tank is connected to the sterilization cavity;

[0017] The hypochlorous acid / iodine / persulfate storage tank is one or two of a hypochlorous acid storage tank, a persulfate storage tank, and an iodine liquid storage tank, preferably a hypochlorous acid storage tank, or a hypochlorous acid storage tank and an iodine liquid storage tank, or a persulfate storage tank;

[0018] A discharge device, a fan, a nozzle, an empty bottle conveyor belt and a nozzle conveyor belt are provided in the disinfection chamber; the discharge device and the fan are located at the bottom of the disinfection chamber, the nozzle and the nozzle conveyor belt are located at the upper part of the disinfection chamber, and the empty bottle conveyor belt is located between the nozzle conveyor belt and the discharge device.

[0019] Furthermore, the size of the disinfection cavity can be set according to the number and size of the disinfection bottles; for example, the disinfection cavity is a rectangular parallelepiped with a length × width × height of 500-600mm × 400-500mm × 400-500mm.

[0020] Furthermore, an empty bottle inlet and an empty bottle outlet are respectively provided on both sides of the disinfection cavity. The empty bottle inlet and the empty bottle outlet are arranged opposite to each other. The size of the empty bottle inlet and the empty bottle outlet can be set according to the size of the empty bottle, for example, the diameter × height size is 100mm × 180mm.

[0021] Furthermore, the plasma discharge device is a variety of structures capable of generating plasma, such as corona discharge, dielectric barrier discharge, sliding arc discharge and other discharge forms, and its structure is the prior art in the art. One or more plasma discharge devices can be provided, for example, two plasma discharge devices.

[0022] Furthermore, the plasma discharge device is connected to a power source, which can be a high-voltage AC power source with a power of 500-5000W.

[0023] Furthermore, the fan is located near the plasma discharge device, preferably arranged before and after the plasma discharge device and the fan, to ensure that the activated active particles are evenly distributed in the disinfection cavity; the number of the fan is the same as that of the plasma discharge device, for example, there are 2 fans.

[0024] Furthermore, an inner wall corresponding to the discharge device of the disinfection cavity is provided with an air inlet for discharge gas, which is used to introduce discharge gas containing hypochlorous acid / iodine solution / persulfate into the disinfection cavity; the number of the air inlets is consistent with the number of the discharge devices.

[0025] Furthermore, the empty bottle conveyor belt and the nozzle conveyor belt respectively transport the empty bottles and nozzles to be sterilized.

[0026] Furthermore, the number of the nozzles can be set according to the actual number of empty bottles to be sterilized, such as 4, 8, etc.

[0027] Furthermore, the empty bottle conveyor belt and the nozzle conveyor belt are respectively provided with brackets for fixing the conveyor belts.

[0028] Furthermore, an automatic telescopic device is provided in the disinfection chamber, the top of the automatic telescopic device is fixedly connected to the top of the disinfection chamber, the nozzle conveyor belt is located on the upper part of the automatic telescopic device, the automatic telescopic device is fixedly connected to the bracket of the nozzle conveyor belt, the empty bottle conveyor belt is located at the bottom of the automatic telescopic device, and the automatic telescopic device is fixedly connected to the bracket of the empty bottle conveyor belt.

[0029] After the empty bottles to be processed enter the empty bottle inlet, they are pulled by the automatic telescopic device until the distance between the nozzle and the bottom of the empty bottle is 1 / 2 of the height of the empty bottle or less, and are conveyed at the same time, keeping the nozzle and the empty bottle relatively still until the empty bottle is sent out from the empty bottle outlet.

[0030] Furthermore, the automatic telescopic device includes an automatic telescopic rod and a motor.

[0031] Furthermore, the nozzle comprises an air inlet pipe, an air outlet pipe and an air pump, the air inlet pipe is connected to the air outlet pipe through the air pump, the air inlet pipe is provided with a nozzle inlet, and the air outlet pipe is provided with a nozzle outlet.

[0032] Furthermore, four semicircular bearings are provided on the bracket below the nozzle conveyor belt. The four bearings are connected to the nozzle conveyor belt. The four bearings are narrower than the width of the nozzle. The bracket is connected to the automatic telescopic rod. When the nozzle conveyor belt circulates, it passes through the bearings without hindering the operation of the conveyor belt and causing the nozzle to collide with the automatic telescopic rod.

[0033] Furthermore, the hypochlorous acid / iodine / persulfate storage tanks are respectively placed on the outside of the disinfection cavity, and the storage tanks are connected to the air inlet of the disinfection cavity through a pipeline.

[0034] Furthermore, the hypochlorous acid / iodine / persulfate storage tank is a cylinder with a radius of 50-200 mm, a height of 80-300 mm, and a size of π×50 mm×50 mm×80 mm-π×200 mm×200 mm×300 mm.

[0035] Furthermore, the hypochlorous acid / iodine / persulfate storage tank is connected to an air generator, and the hypochlorous acid / iodine / persulfate is brought into the disinfection cavity by air in an atomized form or a bubbling form. The hypochlorous acid / iodine / persulfate storage tank is provided with an air inlet and an air outlet, the air inlet is connected to the air generator, and the air outlet is connected to the disinfection cavity through a pipeline.

[0036] Furthermore, after the plasma discharge device discharges, the temperature in the disinfection chamber needs to reach above 70°C, and then the empty bottles to be processed are placed at the inlet for dynamic disinfection.

[0037] Furthermore, the iodine solution storage tank contains iodine solution with a concentration of >0.005 mol / L, the hypochlorous acid storage tank contains hypochlorous acid solution with a concentration of >0.005 mol / L, and the persulfate storage tank contains persulfate solution with a concentration of >0.005 mol / L.

[0038] Furthermore, the air flow rate of the hypochlorous acid storage tank is greater than 10 ml / min, the air flow rate of the iodine solution storage tank is greater than 10 ml / min, and the air flow rate of the persulfate storage tank is greater than 10 ml / min.

[0039] Furthermore, the amount of hypochlorous acid solution, iodine solution or persulfate solution consumed is 30-50 ml / day.

[0040] Furthermore, the disinfection chamber, hypochlorous acid / iodine / persulfate storage tank, nozzle, empty bottle conveyor belt, and nozzle conveyor belt are all made of stainless steel of grade 304 or above.

[0041] The method for sterilizing empty bottles using the above-mentioned sterilizing device comprises the following steps:

[0042] First turn on the power supply, and after discharging for 0-5 minutes, open the hypochlorous acid / iodine / persulfate storage tank, and introduce the discharge gas containing hypochlorous acid / iodine liquid / persulfate into the disinfection chamber. The discharge gas brings the chloric acid / iodine / persulfate solution into the disinfection chamber to generate plasma, and finally generates active particles of hypochlorous acid / iodine / persulfate-plasma. The fan realizes gas circulation to improve the spatial uniformity of the active particles in the disinfection chamber; when the discharge reaches stability, that is, the temperature reaches above 70°C, the empty bottles to be treated that are lower than the temperature of the disinfection chamber are placed in the disinfection chamber, and the active particles are injected into the empty bottles to be treated by the nozzle, and the inner and outer walls of the empty bottles are disinfected by the active particles; since the temperature of the empty bottle is lower than the temperature of the disinfection chamber, the temperature difference will form a layer of water film of active particles on the inner and outer walls of the empty bottle, and the gas phase plasma will be converted into liquid phase plasma on the surface of the empty bottle, and the gas phase plasma will be converted into liquid phase plasma on the surface of the bottle. The iodine, hypochlorite, persulfate, etc. adsorbed on the surface will react with pathogenic microorganisms to enhance the sterilization efficiency of the plasma on the inner and outer walls of the empty bottle.

[0043] Furthermore, after the empty bottle enters from the empty bottle inlet and reaches directly below the nozzle, the automatic telescopic device starts to move upward, and stops rising when the nozzle is less than 1 / 2 of the bottom of the empty bottle. Then the empty bottle moves with the conveyor belt, and the nozzle and the empty bottle move relatively statically. When it is about to reach the empty bottle outlet, the automatic telescopic device moves downward, and then the empty bottle is transported out of the empty bottle outlet. The entire empty bottle must be in contact with the nozzle gas in the disinfection chamber for more than 12 seconds, which can ensure that the sterilization effect of the inner wall of the empty bottle meets the food disinfection specifications.

[0044] Furthermore, the disinfection pathways mainly involved in this method are as follows: the plasma formed by the discharge of the plasma discharge device will produce reactive oxygen particles and reactive nitrogen particles. The synergistic effect of these particles can destroy the cell structure of microorganisms to achieve the sterilization effect. These free radical groups will further react with hypochlorous acid, persulfate and iodine solution to produce disinfection particles with higher oxidizing properties, such as hypochlorite, chlorine, iodine triion, sulfate radical, permonosulfate, etc., so that compared with a single plasma, this method can achieve a more effective sterilization effect.

[0045] The present invention combines the broad-spectrum sterilization capabilities of plasma and hypochlorous acid, iodine solution, and persulfate to achieve efficient and comprehensive disinfection of empty bottles. It is particularly suitable for the disinfection of packaging materials in the beverage, milk, wine and other industries. At the same time, it can also be used for sterilizing the surfaces of other objects when the nozzle is not opened.

[0046] Beneficial effects of the present invention:

[0047] The present invention provides a method for sterilizing the inner and outer walls of an empty bottle by using hypochlorous acid / iodine solution / persulfate enhanced plasma, which combines the effects of plasma and iodine / hypochlorous acid / persulfate to achieve efficient, rapid and comprehensive sterilization of the inner and outer walls of the empty bottle, thereby ensuring (improving) the sterilization effect. The method has little effect on the material of the empty bottle and will not damage the physical properties and chemical stability of the empty bottle itself. Using a small amount of hypochlorous acid, iodine solution, and persulfate instead of a large amount of hydrogen peroxide can reduce energy consumption and environmental pollution.

[0048] This method is not limited to empty bottles made of a single material. For example, bottles made of glass or plastic can all be disinfected using this method, meeting the company's requirements for inactivating pathogenic microorganisms on the inner and outer surfaces of empty bottles. At the same time, directly placing objects (steel sheets, packaging materials, etc.) into the disinfection chamber can kill microorganisms on the surface of the objects. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a stereoscopic diagram of the sterilization device of the present invention.

[0050] Figure 2 It is a front view of the sterilization device of the present invention.

[0051] Figure 3 It is a three-dimensional cross-sectional view of the sterilization device of the present invention.

[0052] Figure 4 It is a left side view of the sterilization device of the present invention.

[0053] Figure 5 It is a rear view of the sterilization device of the present invention.

[0054] Figure 6 It is a diagram showing the effect of different solutions enhancing plasma disinfection of the sterilization device of the present invention.

[0055] Figure 7 It is a diagram of the plasma disinfection effect at different positions of the sterilization device of the present invention.

[0056] Legend: 1 disinfection chamber, 2 hypochlorous acid storage tank or persulfate storage tank, 3 iodine solution storage tank, 4 pipeline, 5 automatic telescopic rod, 6 empty bottle inlet, 7 empty bottle outlet, 8 empty bottle conveyor belt, 9 fan I, 10 fan II, 11 nozzle I, 12 nozzle II, 13 nozzle III, 14 nozzle IV, 15 plasma discharge device I, 16 plasma discharge device II, 17 nozzle conveyor belt. DETAILED DESCRIPTION

[0057] The following non-limiting embodiments may enable a person skilled in the art to more fully understand the present invention, but are not intended to limit the present invention in any way.

[0058] Example 1

[0059] like Figure 1-5 As shown, the present invention provides a sterilization device for the inner and outer walls of empty bottles by using hypochlorous acid enhanced plasma, comprising a sterilization chamber 1 and a hypochlorous acid storage tank 2, wherein the hypochlorous acid storage tank 2 is connected to the sterilization chamber 1; the side walls of the sterilization chamber 1 are respectively provided with an empty bottle inlet 6 and an empty bottle outlet 7; the sterilization chamber 1 is provided with a plasma discharge device, a fan, a nozzle, an empty bottle conveyor belt 8, and a nozzle conveyor belt 17; the plasma discharge device is two, namely, a plasma discharge device I 15 and a plasma discharge device II 16, and the plasma discharge device adopts a dielectric barrier discharge form (patent application number 202 2100545385), the plasma discharge device is located at the bottom of the disinfection chamber 1, and the plasma discharge device is connected to a 2000W AC power supply; the number of the fans is the same as that of the plasma discharge device, which is also 2, namely fan I9 and fan II10, and the plasma discharge device is located at the bottom of the disinfection chamber 1, and the plasma discharge device is arranged before and after the fan; the distance between the plasma discharge device I15, the plasma discharge device II16 and the empty bottle conveyor belt 8 is 40mm; the empty bottle conveyor belt 8 is located between the nozzle conveyor belt 17 and the plasma discharge device. The nozzle conveyor belt 17 is fixed as a whole to the upper part of the disinfection chamber 1, and the 4 nozzles and the corresponding other 4 nozzles are evenly distributed on the nozzle conveyor belt 17. The running speed of the nozzle conveyor belt 17 is 50cm / s with the speed of the empty bottle conveyor belt 8, so that the empty bottle and the nozzle I11, nozzle II12, nozzle III13, and nozzle IV14 remain relatively static during the running process of the empty bottle from the inlet 6 to the outlet 7.

[0060] The disinfection cavity 1 is provided with an air inlet for introducing discharge gas containing hypochlorous acid into the disinfection cavity; the hypochlorous acid storage tank is placed outside the disinfection cavity 1 and connected to the air inlet of the disinfection cavity 1 through a pipe 4. The inlet of the hypochlorous acid storage tank 2 is connected to the outlet of the air generator, and a polytetrafluoroethylene tube is placed inside the hypochlorous acid storage tank 2, extending below the liquid surface. The air generated by the air generator passes through the liquid to generate bubbles, and the hypochlorous acid is brought into the disinfection cavity 1 from the air in the form of bubbles. The hypochlorous acid generated by the hypochlorous acid storage tank 2 enters the disinfection cavity 1 through the pipe 4 by 30mL / min dry air. The outlet of the pipe 4 is 50mm away from the plasma discharge device, and the hypochlorous acid storage tank 2 is fixed near the disinfection cavity 1 with 304 screws.

[0061] The size of the disinfection chamber 1 is 500mm×400mm×400mm. The size of the hypochlorous acid storage tank 2 is π×50mm×50mm×80mm. For disinfecting empty plastic bottles with a size of 70mm×170mm, the size of the empty bottle inlet 6 is 100mm×180mm, and the size of the empty bottle outlet 7 is 100mm×180mm. All components inside and outside the disinfection chamber 1 are made of 304 stainless steel. The hypochlorous acid storage tank 2 stores 200mL of 0.05mol / L hypochlorous acid solution, which is brought into the vicinity of the discharge device in the disinfection chamber 1 through the discharge gas.

[0062] The nozzle includes an air inlet pipe, an air outlet pipe and an air pump. The air inlet pipe is connected to the air outlet pipe through the air pump. The air inlet pipe is provided with a nozzle inlet, and the air outlet pipe is provided with a nozzle nozzle. The nozzle inhales hypochlorous acid-plasma active particles from the inlet and then sprays them into the empty bottle to be treated from the nozzle outlet at a flow rate of 2.4 m / s. During the treatment process, the distance between the nozzle nozzle and the bottom of the empty bottle is 1 / 3 of the distance of the bottle body.

[0063] An automatic telescopic rod 5 is provided in the sterilization chamber 1, the top of the automatic telescopic rod 5 is fixedly connected to the top of the sterilization chamber 1, the nozzle conveyor belt 17 is located at the upper part of the automatic telescopic rod 5, the automatic telescopic rod 5 is fixedly connected to the bracket of the nozzle conveyor belt 17, the empty bottle conveyor belt 8 is located at the bottom of the automatic telescopic rod 5, and the automatic telescopic rod 5 is fixedly connected to the bracket of the empty bottle conveyor belt 8. The automatic telescopic rod 5 controls its upward and downward movement time through electric control, after the empty bottle enters from the empty bottle inlet 6, the upward movement program is ready to start, after the empty bottle is conveyed to the designated position by the empty bottle conveyor belt 8, the automatic telescopic rod 5 moves upward, and before the empty bottle conveyor belt 8 is conveyed to the empty bottle outlet 7, the automatic telescopic rod 5 moves downward, so that the empty bottle moves out from the empty bottle outlet 7, completing the sterilization process.

[0064] The method for sterilizing an empty bottle using the above-mentioned sterilizing device comprises the following steps:

[0065] First, turn on the power supply and discharge for 5 minutes, then open the hypochlorous acid storage tank 2, and introduce the discharge gas containing hypochlorous acid into the disinfection chamber 1. The discharge gas brings the hypochlorous acid into the disinfection chamber 1 to generate plasma, and finally generates active particles of plasma and hypochlorous acid. The fan realizes gas circulation to improve the spatial uniformity of the active particles in the disinfection chamber 1. When the discharge reaches stability, that is, the temperature of the disinfection chamber 1 reaches 85, place the room temperature empty bottles to be processed at the empty bottle inlet 6, and transfer them to the disinfection chamber 1 through the empty bottle conveyor belt 8. The empty bottles are pulled to the bottom of the nozzle by the telescopic device (automatic telescopic rod 5). The nozzle injects active particles into the empty bottle to be treated. When the discharge temperature reaches 85°C, the nozzle injects active particles into the empty bottle to be treated, and the inner and outer walls of the empty bottle are disinfected by the active particles. Since the temperature of the empty bottle is lower than the temperature of the disinfection chamber 1, the temperature difference will form a layer of water film of active particles on the inner and outer walls of the empty bottle, and the gas phase plasma will be converted into liquid phase plasma on the surface of the empty bottle, and the gas phase plasma will be converted into liquid phase plasma on the surface of the bottle. The hypochlorite, OH free radicals, superoxide anions, and peroxynitrite adsorbed on the surface will react with pathogenic microorganisms to enhance the sterilization effect of plasma on the inner and outer walls of the bottle.

[0066] Furthermore, after the empty bottle enters from the empty bottle inlet 6 and reaches directly below the nozzle, the automatic telescopic rod 5 starts to move upward, rises 50mm, and stops rising at a distance of 1 / 3 of the nozzle from the bottom of the bottle. Then the empty bottle moves with the empty bottle conveyor belt 8, and the nozzle and the empty bottle move relatively statically. When it is about to reach the empty bottle outlet 7, the automatic telescopic rod 5 moves downward 50mm, and then the empty bottle is transported out from the empty bottle outlet 7. The entire empty bottle needs to be in contact with the nozzle sprayed gas in the disinfection cavity 1 for about 12s, which can ensure that the sterilization effect of the inner wall of the bottle meets the food disinfection specifications.

[0067] Example 2

[0068] like Figure 1-5 As shown, the present invention provides a kind of sterilization device and method for hypochlorous acid / iodine enhanced plasma to the inner and outer walls of empty bottles, which is different from Example 1 in that an iodine liquid storage tank 3 is added, and the size of the iodine liquid storage tank 3 is π×50mm×50mm×80mm, and the iodine liquid storage tank 3 is composed of 304 stainless steel. The flow rate of dry air passing into hypochlorous acid storage tank 2 and iodine liquid storage tank 3 is 30mL / min, and hypochlorous acid storage tank 2 stores 200mL of 0.05mol / L hypochlorous acid solution, and iodine liquid storage tank 3 stores 200mL of 0.05mol / L iodine liquid. Hypochlorous acid and iodine liquid are brought into the disinfection cavity 1 by air in the form of bubbling. The nozzle ejects gas flow rate of 2.4m / s.

[0069] Example 3

[0070] like Figure 1-5As shown, the present invention provides a hypochlorous acid / iodine enhanced plasma sterilization device and method for the inner and outer walls of an empty bottle, which is different from Example 1 in that the hypochlorous acid storage tank 2 is replaced by a sulfate storage tank 2, and the dry air flow rate of the persulfate storage tank 2 is 30mL / min, and the persulfate storage tank 2 stores 200mL of 0.05mol / L sodium persulfate solution. The sulfate is brought into the disinfection cavity 1 by air in the form of bubbling. The nozzle ejects gas at a flow rate of 2.4m / s.

[0071] Comparative Example 1

[0072] like Figure 1-5 As shown, the present invention provides a plasma sterilization device and method for the inner and outer walls of an empty bottle, which is different from Example 1 in that no hypochlorous acid storage tank 2 is used, and only plasma is used to sterilize the inner and outer walls of the empty bottle.

[0073] Example 4

[0074] Comparison of the bactericidal effects of Examples 1-3 and Comparative Example 1:

[0075] The empty bottle passes through the empty bottle inlet 6 and is treated at the nozzle outlet 1 / 3 of the distance from the bottle bottom for about 12 seconds to verify the sterilization effect after passing hypochlorous acid, hypochlorous acid and iodine solution, or persulfate. To ensure the accuracy of the sterilization effect, 10 8 100 μL of Bacillus subtilis with a concentration of 100 CFU / mL was dropped on the inner wall of the empty bottle. According to the disinfection technical specification, 100 μL of bacterial solution was evenly applied on the inner surface of the empty bottle. After air drying in the clean bench for 30 minutes, the sterilization experiment was performed. The number of Bacillus subtilis on the inner wall of the control sample, that is, the empty bottle without plasma treatment (10 8 CFU / mL).

[0076] In each experiment, after the plasma discharge device was started and stabilized at 85°C for 30 minutes, hypochlorous acid, or hypochlorous acid and iodine solution, or persulfate was introduced for 20 minutes, and then the bottle was sterilized. After 12 seconds of treatment, 100mL of pH=3.5 sterile phosphate buffer was added to the inside of the empty bottle, and the sterilization effect of the inner wall of the empty bottle was verified by filtering and sterilizing with a 0.45μm microporous filter membrane. The outer wall was rinsed with sterile phosphate buffer, and 300μL of the rinsed liquid was evenly applied to the TSB culture medium, and then the culture medium was cultured at 37°C for 18 hours for counting to obtain the sterilization effect. The sterilization effect was obtained by comparing the experimental group with the control sample. The sterilization effect is as follows Figure 6As shown. The results show that after 12 seconds of plasma treatment, the remaining number of Bacillus subtilis is about 600-900, and the killing effect is about 4log. After 12 seconds of treatment with hypochlorous acid enhanced plasma alone, the number of remaining bacteria is still dozens, and the inactivation effect is about 5log. After 12 seconds of treatment with hypochlorous acid and iodine solution enhanced plasma, the empty bottle can be completely killed. After 12 seconds of treatment with sulfate enhanced plasma alone, the empty bottle can also be completely killed. The inactivation effect of these two methods is >6log. The results show that compared with plasma, the combination of hypochlorous acid can improve the sterilization effect, and the combination of hypochlorous acid and iodine solution can further improve the sterilization effect, which can be completely inactivated in 12s. The introduction of persulfate alone can also be completely inactivated in 12s. Experiments have shown that hypochlorous acid, iodine solution, and persulfate can enhance the sterilization effect of plasma on the inner wall of the bottle.

[0077] Comparative Example 2

[0078] like Figure 1-5 As shown, the present invention provides a hypochlorous acid / iodine enhanced plasma sterilization device and method for the inner and outer walls of an empty bottle, which is different from Example 2 in that the empty bottle passes through the empty bottle inlet 6 and is treated for about 12 seconds at the nozzle of the nozzle 2 / 3 away from the bottom of the bottle, and is used to verify the sterilization effect after hypochlorous acid and iodine solution are introduced. The specific sterilization experiment process is the same as that of Example 4.

[0079] Bactericidal effect comparison Figure 7 As shown. It can be seen that the sterilization effect of the nozzle in the empty bottle below 1 / 2 of the bottle body can achieve a complete killing effect in 12s, that is, the sterilization effect is >6log, and the sterilization effect of the nozzle in the empty bottle below more than 1 / 2 of the bottle body cannot be completely killed in 12s, and there are 700-800 left, that is, the sterilization effect is ≈4log. The results show that the sterilization effect of the nozzle in the empty bottle below 1 / 2 of the bottle body is significantly better than that of the nozzle above 1 / 2 of the bottle body.

[0080] The present invention provides a method and method for disinfecting the inner and outer walls of empty bottles by combining plasma with hypochlorous acid / persulfate and iodine solution, comprising a disinfection cavity, a hypochlorous acid / persulfate storage tank, and an iodine solution storage tank, wherein the disinfection cavity has a plasma discharge device. An empty bottle conveyor belt, a nozzle, a nozzle conveyor belt, an empty bottle inlet, and an empty bottle outlet; the inner and outer wall surfaces of the empty bottles are treated by combining plasma with hypochlorous acid, iodine solution, and persulfate. The present invention uses plasma combined with hypochlorous acid / persulfide / iodine solution to improve the sterilization effect on the inner and outer walls of empty bottles.

Claims

1. A method for sterilizing the inner and outer walls of empty bottles by using hypochlorous acid / iodine / persulfate enhanced plasma, characterized in that: The discharge device in the disinfection chamber discharges, and the discharge gas brings the hypochlorous acid / iodine / persulfate solution into the disinfection chamber, and then is activated by the discharge device to generate air-hypochlorous acid / iodine / persulfate-plasma active particles. The gas circulation is realized by the fan. When the discharge reaches stability, that is, the temperature reaches above 70°C, the empty bottles to be treated that are lower than the temperature of the disinfection chamber are placed in the disinfection chamber, and the active particles are injected into the empty bottles by the nozzle, and the inner and outer walls of the empty bottles are disinfected by the active particles; The hypochlorous acid / iodine / persulfate solution is a hypochlorous acid solution, a persulfate solution, or a mixed solution of a hypochlorous acid solution and iodine.

2. The method for sterilizing the inner and outer walls of empty bottles by using hypochlorous acid / iodine / persulfate enhanced plasma according to claim 1, characterized in that: The discharge device in the disinfection chamber discharges to generate plasma. After discharging for 0-5 minutes, a discharge gas containing hypochlorous acid / iodine / persulfate is introduced into the disinfection chamber; the disinfection time for the empty bottles to be treated is 7-12s.

3. The method for sterilizing the inner and outer walls of empty bottles by using hypochlorous acid / iodine solution / persulfate enhanced plasma according to claim 1, characterized in that: The empty bottles to be processed whose temperature is lower than the disinfection chamber temperature are transported to the disinfection chamber through a conveyor belt, and are pulled under the nozzle by an automatic telescopic device.

4. A method for disinfecting the inner and outer walls of empty bottles by using hypochlorous acid / iodine solution / persulfate enhanced plasma according to claim 3, characterized in that: The distance between the nozzle opening and the bottom of the empty bottle is pulled by the automatic telescopic device to be less than 1 / 2 of the height of the empty bottle.

5. The method for sterilizing the inner and outer walls of empty bottles by using hypochlorous acid / iodine solution / persulfate enhanced plasma according to claim 1, characterized in that: The concentration of the iodine solution is >0.005 mol / L, the concentration of the hypochlorous acid solution is >0.005 mol / L, and the concentration of the persulfate solution is >0.005 mol / L; the persulfate is one or more of sodium persulfate, ammonium persulfate, and potassium persulfate.

6. The method for sterilizing the inner and outer walls of empty bottles by using hypochlorous acid / iodine solution / persulfate enhanced plasma according to claim 1, characterized in that: The flow rate of the discharge gas is greater than or equal to 10 ml / min, and the flow rate of the gas ejected from the nozzle is 0.6-4 m / s.

7. A hypochlorous acid / iodine / persulfate enhanced plasma sterilization device for the inner and outer walls of empty bottles, characterized in that: It includes a disinfection chamber and a hypochlorous acid / iodine / persulfate storage tank, wherein the hypochlorous acid / iodine / persulfate storage tank is connected to the disinfection chamber; The hypochlorous acid / iodine / persulfate storage tank is one or two of a hypochlorous acid storage tank, a persulfate storage tank, and an iodine solution storage tank; A discharge device, a fan, a nozzle, an empty bottle conveyor belt and a nozzle conveyor belt are arranged in the disinfection chamber; the discharge device and the fan are located at the bottom of the disinfection chamber, the nozzle and the nozzle conveyor belt are located at the upper part of the disinfection chamber, and the empty bottle conveyor belt is located between the nozzle conveyor belt and the discharge device.

8. The device for sterilizing the inner and outer walls of empty bottles by using hypochlorous acid / iodine / persulfate enhanced plasma according to claim 7, characterized in that: An empty bottle inlet and an empty bottle outlet are respectively provided on both sides of the disinfection chamber; the disinfection chamber has an air inlet, which is connected to a hypochlorous acid / iodine / persulfate storage tank; the hypochlorous acid / iodine / persulfate storage tank is connected to an air generator; the plasma discharge device is connected to a power supply, which is a high-voltage AC power supply; the hypochlorous acid / iodine / persulfate storage tank is placed outside the disinfection chamber.

9. The device for sterilizing the inner and outer walls of empty bottles by using hypochlorous acid / iodine / persulfate enhanced plasma according to claim 7, characterized in that: The empty bottle conveyor belt and the nozzle conveyor belt are respectively provided with brackets; an automatic telescopic device is provided in the disinfection chamber, the top of the automatic telescopic device is fixedly connected to the top of the disinfection chamber, the nozzle conveyor belt is located at the upper part of the automatic telescopic device, the automatic telescopic device is fixedly connected to the bracket of the nozzle conveyor belt, the empty bottle conveyor belt is located at the bottom of the automatic telescopic device, and the automatic telescopic device is fixedly connected to the bracket of the empty bottle conveyor belt; The nozzle comprises an air inlet pipe, an air outlet pipe and an air pump, the air inlet pipe is connected to the air outlet pipe through the air pump, the air inlet pipe is provided with a nozzle inlet, and the air outlet pipe is provided with a nozzle outlet.

10. The device for sterilizing the inner and outer walls of empty bottles by using hypochlorous acid / iodine / persulfate enhanced plasma according to claim 7, characterized in that: The disinfection chamber, hypochlorous acid / iodine / persulfate storage tank, nozzle, empty bottle conveyor belt and nozzle conveyor belt are all made of stainless steel.

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