Rice fresh-keeping, insect-killing and packaging method and system based on secondary vacuumizing and nitrogen charging

Abstract

The invention discloses a rice fresh-keeping, insect-killing and packaging method and system based on secondary vacuumizing and nitrogen charging, and particularly relates to the technical field of food packaging. S2, carrying out primary vacuumizing, namely loading the pretreated rice into a packaging container, putting the packaging container into a vacuum packaging machine, and carrying out primary vacuumizing, so that the vacuum degree in the packaging container reaches a primary vacuum set value; s3, nitrogen charging treatment; s4, secondary vacuumizing is conducted, specifically, the packaging container is vacuumized again, so that the vacuum degree in the packaging container reaches a secondary vacuum set value; according to the method, secondary vacuumizing and nitrogen treatment are conducted on the rice in a vacuumizing and nitrogen combined mode, growth of aerobic microorganisms is inhibited in the vacuum environment, the inertia of nitrogen is utilized, the influence of oxygen and moisture on the rice is reduced, the inhibition effect on anaerobic pests and worm eggs can be effectively achieved, and the rice quality is improved. The fresh-keeping agent has good fresh-keeping and insect-killing effects.

Description

Technical Field

[0001] The present application relates to the technical field of food packaging, and more specifically, to a method and system for preserving freshness and killing insects of rice based on secondary vacuum pumping and nitrogen filling. Background Technique

[0002] As one of the main food crops globally, the issues of freshness preservation and pest control of rice have always been the focus of attention in the food industry. Traditional rice packaging methods are mostly ordinary plastic bag packaging, which cannot effectively isolate oxygen and moisture, easily leading to oxidation, mildew, and pest infestation of rice during storage and transportation, thereby reducing the quality and food safety of rice; with the improvement of people's living standards and the enhancement of food safety awareness, the requirements for rice freshness preservation and insecticidal technology are also getting higher and higher. In the future, rice freshness preservation and insecticidal packaging technology will develop towards a more efficient, environmentally friendly, and intelligent direction. For example, by using new packaging materials and advanced packaging processes, combined with intelligent monitoring technology, the storage environment and quality changes of rice can be monitored in real time to achieve precise freshness preservation and pest control of rice.

[0003] Currently, there are also some rice products on the market that use vacuum packaging or nitrogen filling packaging. Although vacuum packaging can remove oxygen in the package and inhibit the growth of aerobic microorganisms, its inhibitory effect on some anaerobic pests and insect eggs is limited. Nitrogen filling packaging uses the inertness of nitrogen to replace the air in the package and reduce the impact of oxygen and moisture on rice, but there is also a problem of incomplete gas replacement in single nitrogen filling packaging, resulting in unsatisfactory freshness preservation and insecticidal effects;

[0004] Therefore, in view of the above problems, a method and system for preserving freshness and killing insects of rice based on secondary vacuum pumping and nitrogen filling are proposed.

[0005] Application Content

[0006] In order to overcome the above-mentioned defects of the prior art, the present application provides a method and system for preserving freshness and killing insects of rice based on secondary vacuum pumping and nitrogen filling to solve the problems raised in the above background technique.

[0007] To achieve the above object, the present application provides the following technical solution: A method for preserving freshness and killing insects of rice based on secondary vacuum pumping and nitrogen filling, including:

[0008] S1. Pretreatment of rice, pretreat the rice to be packaged so that the moisture content of the rice reaches the storage standard;

[0009] S2. Primary vacuum pumping, load the pretreated rice into a packaging container, put it into a vacuum packaging machine, and perform primary vacuum pumping to make the vacuum degree in the packaging container reach the primary vacuum set value;

[0010] S3. Nitrogen filling treatment: After the first vacuum pumping, nitrogen is filled into the packaging container to make the nitrogen content in the packaging container reach the set value;

[0011] S4. Secondary vacuum pumping: The packaging container is vacuum pumped again to make the vacuum degree in the packaging container reach the secondary vacuum set value;

[0012] S5. Sealing and packaging: After the secondary vacuum pumping, the packaging container is sealed to complete the sealed packaging of the rice.

[0013] Further, the specific steps of the rice pretreatment in S1 are as follows:

[0014] S11: Clean the rice, remove impurities in the rice by using sieve meshes with different pore sizes of a vibrating sieve, and then wash the rice 2 - 3 times with a washing machine;

[0015] S12: Dry the rice, dry the rice by using a fluidized bed dryer or a drum dryer to make the moisture in the rice reach the storage standard, and the storage standard is that the moisture content in the rice is less than 14%;

[0016] S13: Classify the rice, classify the rice according to the particle size by using a planar vibrating sieve, and the rice is divided into three grades: large - grain rice, medium - grain rice and small - grain rice.

[0017] Further, the standards for large - grain rice in S13 are: length greater than 7mm, width greater than 3mm; the standards for medium - grain rice are: length in the range of 6 - 7mm, width between 2.5 - 3mm; the standards for small - grain rice are: length less than 6mm, width less than 2.5mm.

[0018] Further, in S2, the pretreated rice is loaded into the packaging container, then placed into the vacuum chamber of a vacuum packaging machine, and then the air extraction device is started to vacuum pump the vacuum chamber to make the vacuum degree in the packaging container reach the primary vacuum set value, and the primary vacuum set value is - 0.08MPa.

[0019] Further, the packaging container uses a plastic composite packaging bag.

[0020] Further, in the nitrogen filling treatment of S3, open the nitrogen filling device to fill nitrogen with a purity of 99.9% into the packaging container, and continue to keep the air extraction device in S2. At the same time, detect the nitrogen content in the packaging container during the nitrogen filling process. When it is detected that the nitrogen content in the packaging container is greater than 10%, then close the air extraction device and continue the nitrogen filling treatment to make the nitrogen content in the packaging container greater than 95%.

[0021] Further, in S4, the inflation device continues to inflate the packaging container. When it is detected that the nitrogen content in the packaging container is greater than 95%, the air extraction device is started to perform secondary vacuum pumping on the packaging container, and the speed of secondary vacuum pumping is greater than the nitrogen inflation speed. When it is detected that the nitrogen content in the packaging container is less than 85%, the inflation device is closed, while the air extraction device continues to perform secondary vacuum pumping on the packaging container to make the vacuum degree in the packaging container reach the secondary vacuum set value, and the secondary vacuum set value is -0.095 MPa.

[0022] Further, in S5, the sealing device is started to perform heat sealing treatment on the packaging container to complete the packaging of rice.

[0023] Further, a system for a rice fresh-keeping and insecticidal packaging method based on secondary vacuum pumping and nitrogen filling includes:

[0024] A raw material pretreatment module for pretreating rice to make the moisture content of the rice to be packaged reach the storage standard;

[0025] A primary vacuum pumping treatment module for performing the first vacuum pumping treatment on the packaging container containing rice;

[0026] A nitrogen filling module for filling nitrogen into the interior of the packaging container;

[0027] A secondary vacuum pumping treatment module for performing secondary vacuum pumping treatment on the interior of the packaging container;

[0028] A gas control module for detecting the air and nitrogen content in the packaging container and controlling the gas inside the packaging container through the air extraction device and the inflation device;

[0029] A packaging module for performing heat sealing treatment on the packaging container for packaging.

[0030] The technical effects and advantages of this application:

[0031] 1. Compared with the prior art, this application uses a combination of vacuum pumping and nitrogen to perform secondary vacuum pumping and nitrogen treatment on rice. It not only utilizes the vacuum environment to inhibit the growth of aerobic microorganisms but also utilizes the inertness of nitrogen to reduce the influence of oxygen and moisture on rice, and can effectively inhibit anaerobic pests and insect eggs, having good fresh-keeping and insecticidal effects;

[0032] 2. Compared with the prior art, in the nitrogen filling process of the present application, the nitrogen filling device is opened to fill nitrogen with a purity of 99.9% into the packaging container, and the air extraction device is continuously maintained. At the same time, the nitrogen content in the packaging container is detected during the nitrogen filling process. When the detected nitrogen content in the packaging container is greater than 10%, the air extraction device is closed, and the nitrogen filling process is continued to make the nitrogen content in the packaging container greater than 95%. When starting the nitrogen filling process, the air extraction device is not immediately closed. Such an operation is beneficial to further expel the air in the packaging container with nitrogen, making the air extraction more complete, and at the same time avoiding the entry of external air into the interior of the packaging container after the air extraction device is closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic flow diagram of the method of the present application.

[0034] Figure 2 It is a schematic flow diagram of the system of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0036] Embodiment 1

[0037] As shown in the attached Figure 1 A rice fresh-keeping and insecticidal packaging method based on secondary vacuum extraction and nitrogen filling includes:

[0038] S1. Pretreatment of rice: Pretreat the rice to be packaged so that the moisture content of the rice reaches the storage standard;

[0039] S2. Primary vacuum extraction: Put the pretreated rice into a packaging container, place it in a vacuum packaging machine, and perform primary vacuum extraction to make the vacuum degree in the packaging container reach the primary vacuum set value;

[0040] S3. Nitrogen filling treatment: After primary vacuum extraction, fill nitrogen into the packaging container to make the nitrogen content in the packaging container reach the set value;

[0041] S4. Secondary vacuum extraction: Perform vacuum extraction on the packaging container again to make the vacuum degree in the packaging container reach the secondary vacuum set value;

[0042] S5. Sealing and packaging: After secondary vacuum extraction, perform sealing treatment on the packaging container to complete the sealed packaging of the rice.

[0043] The specific steps for pre-treating rice in S1 are as follows:

[0044] S11: Clean the rice, remove impurities in the rice using sieve meshes with different pore sizes of a vibrating sieve, and then wash the rice 2 - 3 times with a rice washer;

[0045] S12: Dry the rice. Use a fluidized bed dryer or a drum dryer to dry the rice so that the moisture content in the rice reaches the storage standard, and the storage standard is that the water content in the rice is less than 14%;

[0046] S13: Classify the rice. Pass the rice through a planer revolving sieve to classify it according to the size of the grains. The rice is divided into three grades: large-grain rice, medium-grain rice, and small-grain rice. The standards for medium and large-grain rice are: length greater than 7 mm, width greater than 3 mm; the standards for medium-grain rice are: length in the range of 6 - 7 mm, width between 2.5 - 3 mm; the standards for small-grain rice are: length less than 6 mm, width less than 2.5 mm. Classifying the rice into three grades can first be used to store rice with different grain sizes. Secondly, it can improve the quality of the rice, distinguish the quality of the rice in detail, facilitate consumers to choose according to their own preferences, and improve the market competitiveness of the rice.

[0047] In S2, load the pre-treated rice into a packaging container, then place it into the vacuum chamber of a vacuum packaging machine, and then start the air extraction device to evacuate the vacuum chamber so that the vacuum degree in the packaging container reaches the primary vacuum set value, and the primary vacuum set value is -0.08 MPa.

[0048] The packaging container uses a plastic composite packaging bag.

[0049] In the nitrogen filling treatment of S3, open the nitrogen gas filling device to fill nitrogen with a purity of 99.9% into the packaging container, and continue to maintain the air extraction device in S2. At the same time, detect the nitrogen content in the packaging container during the nitrogen filling process. When it is detected that the nitrogen content in the packaging container is greater than 10%, then close the air extraction device, and continue the nitrogen filling treatment to make the nitrogen content in the packaging container greater than 95%. When starting the nitrogen filling treatment, do not immediately close the air extraction device. Such an operation is conducive to using nitrogen to further expel the air in the packaging container, making the air extraction more complete, and at the same time avoiding the entry of external air into the interior of the packaging container after closing the air extraction device.

[0050] In S4, the inflation device continues to inflate the packaging container. When it is detected that the nitrogen content in the packaging container is greater than 95%, the air extraction device is started to perform a secondary vacuum extraction on the packaging container, and the speed of the secondary vacuum extraction is greater than the nitrogen inflation speed. When it is detected that the nitrogen content in the packaging container is less than 85%, the inflation device is closed, while the air extraction device continues to perform a secondary vacuum extraction on the packaging container to make the vacuum degree in the packaging container reach the secondary vacuum set value, and the secondary vacuum set value is -0.095 MPa. When the nitrogen content is greater than 95%, the air extraction device is started, and after the air extraction device is started, the inflation device continues to inflate the packaging container. This can prevent the outside air from entering the interior of the packaging container due to the pressure difference during air extraction and can maintain the efficiency of the secondary vacuum extraction.

[0051] In S5, the sealing device is started to perform heat sealing treatment on the packaging container to complete the packaging of rice.

[0052] Embodiment 2

[0053] As shown in the attached Figure 2 figure, a system for a rice fresh-keeping and insecticidal packaging method based on secondary vacuum extraction and nitrogen filling includes:

[0054] A raw material pretreatment module for pretreating rice so that the moisture content of the rice to be packaged reaches the storage standard;

[0055] A primary vacuum extraction processing module for performing a first vacuum extraction treatment on the packaging container containing rice;

[0056] A nitrogen filling module for filling nitrogen into the interior of the packaging container;

[0057] A secondary vacuum extraction processing module for performing a secondary vacuum extraction treatment on the interior of the packaging container;

[0058] A gas control module for detecting the air and nitrogen content in the packaging container and controlling the gas inside the packaging container through the air extraction device and the inflation device;

[0059] A packaging module for performing heat sealing treatment on the packaging container for packaging.

[0060] The working process of this application is as follows: First, the rice to be packaged is pre-treated to make the moisture content of the rice reach the storage standard. Then, the pre-treated rice is loaded into a packaging container and placed in a vacuum packaging machine for the first vacuuming to make the vacuum degree in the packaging container reach the first vacuum set value. After the first vacuuming, nitrogen is filled into the packaging container to make the nitrogen content in the packaging container reach the set value. Then, the packaging container is vacuumed again to make the vacuum degree in the packaging container reach the second vacuum set value. After the second vacuuming, the packaging container is sealed to complete the sealed packaging of the rice. The above is the working principle of the rice fresh-keeping and insecticidal packaging method and system based on secondary vacuuming and nitrogen filling.

Claims

1. A rice preservation and insecticidal packaging method based on secondary vacuuming and nitrogen filling, characterized in that: include: S1. Rice pretreatment, the rice to be packaged is pretreated so that the moisture content of the rice reaches the storage standard; S2. Once vacuumed, the pretreated rice is placed in a packaging container, placed in a vacuum packaging machine, and vacuumed once so that the vacuum degree within the packaging container reaches a vacuum setting value; S3. Nitrogen filling treatment: after vacuuming once, nitrogen is filled into the packaging container so that the nitrogen content in the packaging container reaches the set value; S4. Secondary vacuuming: vacuuming the packaging container again so that the vacuum degree in the packaging container reaches the secondary vacuum setting value; S5. Sealing and packaging: After the second vacuuming, the packaging container is sealed to complete the sealed packaging of the rice.

2. A rice preservation and insecticidal packaging method based on secondary vacuuming and nitrogen filling according to claim 1, characterized in that: The specific steps of pre-treating rice in S1 are: S11: cleaning the rice, removing impurities in the rice using screens of different apertures of a vibrating screen, and then washing the rice 2-3 times using a washing machine; S12: Drying the rice by using a fluidized bed dryer or a drum dryer to dry the rice so that the moisture content of the rice reaches a storage standard, and the storage standard is that the moisture content of the rice is less than 14%; S13: Classifying the rice: Classifying the rice by passing it through a flat rotary screen according to the size of the grains, and the rice is classified into three grades: large-grain rice, medium-grain rice and small-grain rice.

3. A rice preservation and insecticidal packaging method based on secondary vacuuming and nitrogen filling according to claim 2, characterized in that: The standard of large-grain rice in S13 is: length greater than 7mm, width greater than 3mm; the standard of medium-grain rice is: length range of 6-7mm, width of 2.5-3mm; the standard of small-grain rice is: length less than 6mm, width less than 2.5mm.

4. A rice preservation and insecticidal packaging method based on secondary vacuuming and nitrogen filling according to claim 1, characterized in that: In S2, the pretreated rice is loaded into a packaging container, which is then placed into a vacuum chamber of a vacuum packaging machine, and then a vacuum device is started to evacuate the vacuum chamber so that the vacuum degree in the packaging container reaches a primary vacuum setting value, and the primary vacuum setting value is -0.08 MPa.

5. A rice preservation and insecticidal packaging method based on secondary vacuuming and nitrogen filling according to claim 4, characterized in that: The packaging container is a plastic composite packaging bag.

6. A rice preservation and insecticidal packaging method based on secondary vacuuming and nitrogen filling according to claim 1, characterized in that: In the nitrogen filling treatment in S3, the nitrogen filling device is opened to flush nitrogen with a purity of 99.9% into the packaging container, and the exhaust device in S2 is continued to be maintained. At the same time, the nitrogen content in the packaging container is detected during the nitrogen filling process. When it is detected that the nitrogen content in the packaging container is greater than 10%, the exhaust device is closed, and the nitrogen filling treatment is continued to make the nitrogen content in the packaging container greater than 95%.

7. A rice preservation and insecticidal packaging method based on secondary vacuuming and nitrogen filling according to claim 6, characterized in that: In S4, the inflation device continues to inflate the packaging container. When it is detected that the nitrogen content in the packaging container is greater than 95%, the exhaust device is started to perform secondary vacuum extraction on the packaging container, and the speed of the secondary vacuum extraction is greater than the nitrogen inflation speed. When it is detected that the nitrogen content in the packaging container is less than 85%, the inflation device is turned off, and the exhaust device continues to perform secondary vacuum extraction on the packaging container, so that the vacuum degree in the packaging container reaches the secondary vacuum setting value, and the secondary vacuum setting value is -0.095MPa.

8. The rice preservation and insecticidal packaging method based on secondary vacuuming and nitrogen filling according to claim 1, characterized in that: In S5, the sealing device is started to heat-seal the packaging container to complete the packaging of the rice.

9. A system for a rice preservation and insecticidal packaging method based on secondary vacuum pumping and nitrogen filling, applied to a rice preservation and insecticidal packaging method based on secondary vacuum pumping and nitrogen filling as claimed in any one of claims 1 to 8, characterized in that: include: A raw material pretreatment module is used to pretreat the rice so that the moisture content of the rice to be packaged reaches the storage standard; A primary vacuum treatment module, used for performing a first vacuum treatment on a packaging container containing rice; A nitrogen filling module is used to fill the interior of the packaging container with nitrogen; A secondary vacuum treatment module is used to perform a secondary vacuum treatment on the inside of the packaging container; A gas control module is used to detect the air and nitrogen content in the packaging container and control the gas inside the packaging container through the air extraction device and the air extraction device; The packaging module is used to perform heat sealing on the packaging container for packaging.

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