Production process of vacuum-packaged roasted corn

Abstract

The invention relates to the technical field of vacuum packaging, in particular to a vacuum-packaged roasted corn production process which comprises the following steps: pretreating corn to be treated, roasting, cooling and then performing vacuum packaging, the influence coefficient of the packaging environment on the packaging materials is determined by combining the historical environment temperature, the historical environment humidity and the historical elasticity modulus of the multiple packaging materials; in the vacuumizing process, the initial air amount in the packaging material is determined according to the corn volume, the corn porosity and the packaging material volume, and the ideal volume interval of extracted air is determined in combination with the influence coefficient and the tensile strength; meanwhile, the deformation degree is determined according to the elastic modulus, the influence coefficient, the internal and external pressure difference and displacement information, the defect degree and the adjusting mode are determined according to the ideal volume interval, the extracted air volume and the deformation degree, and the vacuum packaging effect is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum packaging, and in particular to a production process of vacuum-packed roasted corn. Background Art

[0002] Vacuum packaging is to completely extract the air inside the packaging material and seal it, so that the bag is in a highly decompressed state. By inhibiting the growth and reproduction of aerobic microorganisms, the purpose of keeping the product fresh and disease-free is achieved. Corn is rich in various nutrients and is prone to deterioration at room temperature. At present, vacuum packaging is often used to extend the shelf life of corn.

[0003] During the process of vacuum packaging corn, the following problems often occur, resulting in poor vacuum effect, including: the corn is not fully cooled before packaging, and the residual heat causes the vacuum package to bulge; the air extraction is not thorough, resulting in insufficient vacuum degree, or the gap between the packaging material and the corn is too large, increasing the difficulty of vacuum extraction and affecting the vacuum degree; after vacuum extraction, heat sealing is carried out, and the heat sealing time and temperature are too long or too short, resulting in sealing defects and affecting the sealing performance of the packaging material.

[0004] Chinese Patent Application Publication No.: CN118560769A discloses a control method and system for a meat vacuum packaging device, including: detecting the surface moisture presence state information of meat products on the production line to adjust the surface drying treatment state of the meat products by the drying mechanism; then visually identifying the external shape feature information of the dried meat to adjust the operating state of the manipulator to load the meat into the packaging material; and also analyzing the deformation state data of the packaging material during vacuum extraction to inspect the vacuum situation inside the packaging material.

[0005] It can be seen that although the technical solution determines whether the packaging material is reduced to the limit state by obtaining the change data of the volume reduction rate of the packaging material through the dynamic image of the shape change of the packaging material during the vacuum extraction process to judge the vacuum extraction effect, there are still the following problems: the influence of the packaging material property differences on the vacuum effect is not considered, and only by detecting the volume reduction of the packaging material during the vacuum extraction process to determine the vacuum extraction effect, the quality of the vacuum packaging cannot be comprehensively and accurately evaluated. Summary of the Invention

[0006] Therefore, the present invention provides a production process of vacuum-packed roasted corn to overcome the problems in the prior art that the influence of the packaging material on the vacuum effect is not considered when judging the vacuum extraction effect, and the judgment data dimension is single, which further affects the accuracy of the evaluation of the vacuum packaging quality.

[0007] To achieve the above object, the present invention provides a production process of vacuum-packed roasted corn, including:

[0008] Step S1, peeling and removing impurities from the corn to be processed, grading the corn, and cleaning and drying each grade of corn;

[0009] Step S2: Bake the dried corn, and perform vacuum packaging after cooling. Among them,

[0010] Step S21: Determine the influence coefficient of the packaging environment on the packaging material according to the historical ambient temperature, historical ambient humidity in the vacuum packaging environment, and the historical elastic modulus of several packaging materials;

[0011] Step S22: During the vacuum pumping process, determine the initial air volume in the packaging material according to the volume of the corn to be packaged, the porosity of the corn, and the volume of the packaging material. Determine the ideal volume range of the extracted air according to the initial air volume, the influence coefficient, and the tensile strength of the packaging material;

[0012] Step S23: During the vacuum pumping process, monitor the internal and external pressure difference of the packaging material and the displacement information of the characteristic points of the packaging pattern on the surface of the packaging material. Determine the deformation degree of the packaging material according to the real-time elastic modulus, the influence coefficient, the internal and external pressure difference, and the displacement information, and determine the defect degree of the vacuum packaging and the adjustment method for the initial vacuum degree according to the comparison result between the ideal volume range and the extracted air volume and the deformation degree;

[0013] Among them, the displacement information includes the transverse displacement and longitudinal displacement of the corresponding characteristic points of the surface packaging pattern;

[0014] Step S3: Sterilize the corn after vacuum packaging and store it in the warehouse.

[0015] Further, in step S21, construct a first relationship model according to the historical ambient temperature and the historical elastic modulus, construct a second relationship model according to the historical ambient humidity and the historical elastic modulus, determine the temperature influence factor according to the first relationship model, determine the humidity influence factor according to the second relationship model, and determine the influence coefficient according to the temperature influence factor and the humidity influence factor.

[0016] Further, in step S22, collect corn images of the corn to be packaged based on several angles, determine the particle area and the void area according to the corn images, determine the porosity of the corn according to the particle area and the void area to determine the actual solid volume of the corn, and also determine the initial air volume according to the actual solid volume and the volume of the packaging material.

[0017] Further, in step S22, determine the lower limit of the volume range according to the initial air volume and the influence coefficient, determine the upper limit of the volume range according to the initial air volume, the influence coefficient, and the tensile strength, and determine the ideal volume range according to the lower limit and the upper limit of the volume range.

[0018] Further, in step S22, the maximum negative pressure that the packaging material can withstand is determined according to the tensile strength, and the upper limit of the volume range is determined according to the initial pressure, the maximum negative pressure, the initial air volume, and the influence coefficient inside the packaging material.

[0019] Further, in step S23, the first relative deformation degree of the packaging material is determined according to the real-time elastic modulus, the influence coefficient, and the internal and external pressure difference, the second relative deformation degree of the packaging material is determined according to the displacement information, and the deformation degree is determined according to the first relative deformation degree and the second relative deformation degree.

[0020] Further, in step S23, the acting force applied to the packaging material is determined according to the internal and external pressure difference and the stress area of the packaging material, the stress of the packaging material is determined according to the cross-sectional area of the packaging material and the acting force, and the first relative deformation degree is determined according to the stress and the real-time elastic modulus.

[0021] Further, in step S23, the vacuum distance and the strain direction between each feature point are determined according to the transverse displacement and the longitudinal displacement corresponding to each feature point, the strain degree in the corresponding strain direction is determined according to the vacuum distance and the initial distance, and the second relative deformation degree is determined according to the strain degree.

[0022] Further, in step S23, determining the degree of defect includes:

[0023] If the volume of the extracted air is within the ideal volume range and the deformation degree is less than or equal to the preset deformation threshold, the degree of defect is 0;

[0024] If the volume of the extracted air exceeds the ideal volume range, and the deformation degree is greater than or less than the preset deformation threshold, the degree of defect is determined according to the volume of the extracted air, the ideal volume range, the deformation degree, and the preset deformation threshold.

[0025] Further, in step S23, determining the adjustment method for the initial vacuum degree includes:

[0026] If the volume of the extracted air is greater than the upper limit of the volume range and the deformation degree is greater than the preset deformation threshold, the initial vacuum degree is reduced;

[0027] If the volume of the extracted air is less than the lower limit of the volume range and the deformation degree is less than the preset deformation threshold, the initial vacuum degree is increased.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows. The present invention takes into account the influence coefficients of the packaging environmental temperature and humidity on the packaging material, combines the volume, porosity of the corn, and the volume of the packaging material during the vacuuming process to determine the actual initial air volume in the packaging bag. At the same time, it considers the displacement information, real-time elastic modulus, influence coefficient, and internal and external pressure difference of the surface pattern of the packaging material during vacuuming to determine the deformation degree of the packaging material, and then determines the defect degree of the vacuum packaging and adjusts the vacuuming parameters, thereby further ensuring the quality and efficiency of the vacuum packaging, reducing the defective rate, effectively extending the shelf life of the corn, and improving the scientificity and accuracy of the vacuum packaging.

[0029] Further, the present invention determines the influence coefficient of the packaging environment on the packaging material by constructing a relationship model between the environmental temperature, humidity, and elastic modulus, comprehensively considering the influence of environmental factors on the performance of the packaging material, further accurately controlling the vacuum packaging process, avoiding the problem of poor vacuum packaging effect caused by environmental changes, reducing the defective rate, improving the packaging quality and efficiency, and enhancing the scientificity of the vacuum packaging.

[0030] Further, the present invention considers the influence coefficient of the packaging environment on the elastic modulus of the packaging material, as well as the initial air volume and tensile strength to jointly determine the upper limit and lower limit of the volume range of the extracted air during vacuuming to determine the ideal volume range, which is convenient for further judging the defect degree of the vacuum packaging, thereby further ensuring the quality and efficiency of the vacuum packaging, and improving the scientificity and accuracy of the vacuum packaging.

[0031] Further, the present invention comprehensively considers the inherent properties of the packaging material, environmental factors, and pressure to determine the first relative deformation degree, and determines the second relative deformation degree based on the actual displacement measurement of the surface pattern of the packaging material. Combining the first relative deformation degree and the second relative deformation degree enables a more comprehensive and accurate judgment of the deformation degree of the packaging material during vacuum packaging, which is convenient for further determining the defect degree of the vacuum, thereby further ensuring the quality and efficiency of the vacuum packaging, and improving the scientificity and accuracy of the vacuum packaging.

[0032] Further, the present invention determines the vacuum distance and strain direction between each feature point according to the WeChat information of each feature point, and combines the vacuum distance and the initial distance to determine the strain degree in the corresponding strain direction to determine the second relative deformation degree, which is convenient for further determining the deformation degree of the packaging material according to the first relative deformation degree and the second relative deformation degree, thereby further determining the defect degree, ensuring the quality and efficiency of the vacuum packaging, and improving the scientificity and accuracy of the vacuum packaging.

[0033] Furthermore, the present invention determines the degree of vacuum packaging defects through the ideal volume range and the preset deformation threshold, realizes the precise grading of vacuum packaging defects, provides a basis for quality control, facilitates workers to determine problems in the production process in a timely manner according to the judgment results of the defect degree, realizes fault traceability, helps to further improve the production process and improve the production quality. It enhances the scientificity and accuracy of vacuum packaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a flowchart for determining the influence coefficient of the environment on the packaging material in an embodiment of the present invention;

[0035] Figure 2 It is a flowchart for determining the ideal volume range in an embodiment of the present invention;

[0036] Figure 3 It is a flowchart for determining the first relative deformation degree in an embodiment of the present invention;

[0037] Figure 4 It is a flowchart for determining the second relative deformation degree in an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0038] In order to make the objectives and advantages of the present invention clearer, the present invention will be further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0039] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and do not limit the protection scope of the present invention.

[0040] It should be noted that in the description of the present invention, the terms indicating directions or positional relationships such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention.

[0041] Specifically, the present invention provides a production process for vacuum-packaged roasted corn, which is characterized by including:

[0042] Step S1, peeling and removing impurities from the corn to be processed, classifying the grades, and cleaning and drying the corn of each grade;

[0043] Step S2, baking the dried corn, and performing vacuum packaging after cooling, wherein,

[0044] Step S21: Determine the influence coefficient of the packaging environment on the packaging material based on the historical ambient temperature, historical ambient humidity in the vacuum packaging environment, and the historical elastic moduli of several packaging materials.

[0045] Step S22: During the vacuum pumping process, determine the initial air volume inside the packaging material based on the volume of the corn to be packaged, the porosity of the corn, and the volume of the packaging material. Then, determine the ideal volume range of the air to be pumped out based on the initial air volume, the influence coefficient, and the tensile strength of the packaging material.

[0046] Step S23: During the vacuum pumping process, monitor the pressure difference between the inside and outside of the packaging material and the displacement information of the characteristic points of the packaging pattern on the surface of the packaging material. Determine the deformation degree of the packaging material based on the real-time elastic modulus, the influence coefficient, the pressure difference between the inside and outside, and the displacement information. Then, determine the defect degree of the vacuum packaging and the adjustment method for the initial vacuum degree based on the comparison result between the ideal volume range and the volume of the air pumped out and the deformation degree.

[0047] Among them, the displacement information includes the transverse displacement and longitudinal displacement of the corresponding characteristic points of the surface packaging pattern.

[0048] Step S3: Sterilize the corn that has completed vacuum packaging and store it in the warehouse.

[0049] It can be understood that the sizes of corns are uneven. The volumes, porosities of different corns, and the volume of the packaging material determine the differences in the initial air volume inside the packaging material. At the same time, the packaging environment temperature and ambient humidity will affect the performance of the packaging material, resulting in material deformation, changes in elastic modulus, etc., and then leading to poor vacuum packaging effects. Therefore, during vacuum packaging, the deformation situation of the packaging material is understood in real time through the displacement information of the characteristic points of the pattern outside the packaging material. Secondly, considering the influence of the packaging environment on the elastic modulus of the packaging material, the influence coefficient and the pressure difference between the inside and outside are introduced to determine the deformation degree of the packaging material, and the defect degree of the vacuum packaging is jointly judged in combination with the comparison result between the actual volume of the air pumped out and the ideal volume range, and the vacuum pumping parameters are adjusted to ensure the vacuum effect.

[0050] It can be understood that the volume of the corn is the volume of the corn to be packaged including the pores in the corn kernels, and the initial air volume is the volume of the air inside the bag after the packaging material is filled with corn.

[0051] It can be understood that during vacuum pumping, the internal air pressure of the packaging material decreases, and the external atmospheric pressure relatively increases, and the material will be subjected to an outward pulling force. If too much air is pumped out, the resulting pressure difference exceeds the bearing range of the tensile strength of the packaging material, and the packaging will rupture. Therefore, determining the ideal volume range of the air to be pumped out based on the tensile strength can ensure the integrity of the packaging after vacuum pumping and avoid packaging failure caused by rupture, which affects the preservation of corn.

[0052] In a specific embodiment, the length, diameter, and plumpness of the corn can be used as judgment indicators, and the corn can be graded according to these judgment indicators.

[0053] The present invention considers the influence coefficients of the packaging environmental temperature and humidity on the packaging material, combines the volume, porosity of the corn, and the volume of the packaging material during the vacuum pumping process to determine the actual initial air volume in the packaging bag, and at the same time considers the displacement information, real-time elastic modulus, influence coefficient, and internal and external pressure difference of the surface pattern of the packaging material during vacuum pumping to determine the deformation degree of the packaging material, and then determines the defect degree of the vacuum packaging and adjusts the vacuum pumping parameters, so as to further ensure the quality and efficiency of the vacuum packaging, reduce the defective rate, effectively extend the shelf life of the corn, and improve the scientificity and accuracy of the vacuum packaging.

[0054] Please refer to Figure 1 as shown in Figure 1 which is a step diagram for determining the influence coefficient of the environment on the packaging material in the embodiment of the present invention. Specifically, in step S21, it includes:

[0055] Step S211, constructing a first relationship model according to the historical environmental temperature and the historical elastic modulus;

[0056] Step S212, constructing a second relationship model according to the historical environmental humidity and the historical elastic modulus;

[0057] Step S213, determining the temperature influence factor according to the first relationship model, and determining the humidity influence factor according to the second relationship model;

[0058] Step S214, determining the influence coefficient according to the temperature influence factor and the humidity influence factor.

[0059] It can be understood that during the vacuum packaging process, the performance of the packaging material is mainly affected by temperature and humidity factors. When the temperature rises, the elastic modulus of the packaging material will decrease, and at the same time, humidity will also affect the elastic modulus of the packaging material. Therefore, by constructing the first relationship model and the second relationship model, the influence of these environmental factors on the elastic modulus of the packaging material can be quantified, so as to more accurately evaluate its influence on the vacuum packaging effect.

[0060] In a specific embodiment, based on the historical environmental temperature and the historical elastic modulus, a first relationship model between temperature and elastic modulus is constructed using statistical analysis or machine learning algorithms to quantify the influence of temperature on the elastic modulus of the packaging material. Similarly, based on the historical environmental humidity and the historical elastic modulus, a relationship model between humidity and elastic modulus is constructed to quantify the influence of humidity on the elastic modulus of the packaging material. For example, defining the historical environmental temperature as the independent variable and the historical elastic modulus as the dependent variable, the first relationship model is Among them, the historical ambient temperature and the historical elastic modulus are negatively correlated, 0 < a < 1, and k is the temperature influence factor. Defining the historical ambient humidity as the independent variable and the historical elastic modulus as the dependent variable, the second relationship model is Among them, the historical ambient humidity and the historical elastic modulus are negatively correlated, 0 < r < 1, and c is the humidity influence factor. Influence coefficient = temperature influence factor × temperature weight + humidity influence factor × humidity weight, and each of the temperature weight and the humidity weight is 0.5. The sum of the temperature weight and the humidity weight is 1. In implementation, the value ranges and preferred values of the temperature weight, the humidity weight, the temperature influence factor, and the humidity influence factor can be determined according to the actual situation, and no specific limitation is made here and will not be elaborated further.

[0061] The present invention determines the influence coefficient of the packaging environment on the packaging material by constructing a relationship model among the ambient temperature, humidity, and elastic modulus, comprehensively considers the influence of environmental factors on the performance of the packaging material, further accurately controls the vacuum packaging process, avoids the problem of poor vacuum packaging effect caused by environmental changes, reduces the defective rate, improves the packaging quality and efficiency, and improves the scientificity of vacuum packaging.

[0062] Specifically, in step S22, corn images of the corn to be packaged are collected based on a plurality of angles, the particle area and the void area are determined according to the corn images, the corn porosity is determined according to the particle area and the void area to determine the actual solid volume of the corn, and the initial air volume is also determined according to the actual solid volume and the volume of the packaging material.

[0063] It can be understood that there are voids between the corn kernels. Therefore, the corn particle area and the void area of the corn to be packaged are determined according to the corn images of the corn to be packaged to determine the porosity of a single piece of corn to be packaged, so as to obtain the actual solid volume of the corn. At the same time, in order to obtain the complete corn shape, multiple-angle shooting is performed to reduce data loss and provide comprehensive original data for subsequent analysis.

[0064] It can be understood that the porosity reflects the packing density of the corn. Combining with the total volume of the corn, the actual solid volume of the corn can be calculated to accurately determine the actual occupied space of the corn. At the same time, the initial air volume in the packaging material can be obtained by combining the actual solid volume with the volume of the packaging material, which helps to reasonably determine the air extraction volume during vacuum packaging.

[0065] In a specific embodiment, the acquisition angles of the corn images can be the four side directions of the front, back, left, and right of the corn, or the images can be taken at intervals of 10° to obtain the corn images. Subsequently, an image segmentation algorithm such as Mask R-CNN can be used to classify each pixel in the acquired corn images to determine whether the pixel belongs to the particle area or the void area. The single porosity corresponding to a single corn image = void area / (void area + particle area), the porosity is the average value of the single porosities corresponding to the corn images at several angles, the corresponding actual solid volume of the corn = (1 - porosity) × corn volume, and the initial air volume = packaging material volume - actual solid volume. In practice, the acquisition angles and porosity of the corn images can be determined according to the actual situation, which are not specifically limited here and will not be elaborated further.

[0066] Please refer to Figure 2 as shown in Figure 2 the step diagram for determining the ideal volume range in the embodiment of the present invention; specifically, in step S22, it includes:

[0067] Step S221, determining the lower limit of the volume range according to the initial air volume and the influence coefficient;

[0068] Step S222, determining the upper limit of the volume range according to the initial air volume, the influence coefficient, and the tensile strength;

[0069] Step S223, determining the ideal volume range according to the lower limit and the upper limit of the volume range.

[0070] Specifically, in step S22, the maximum negative pressure that the packaging material can withstand is determined according to the tensile strength, and the upper limit of the volume range is determined according to the initial pressure, the maximum negative pressure, the initial air volume, and the influence coefficient inside the packaging material.

[0071] It can be understood that the ideal volume range is the extracted air volume range set considering the influence of the environment on the elastic modulus of the packaging material and the tensile strength of the packaging material itself. After extracting air within this range, the vacuum effect is good and there are no defects. The initial pressure inside the packaging bag is the atmospheric pressure. During the process of extracting air, the internal pressure of the vacuum packaging decreases, and the external atmospheric pressure will generate an inward pressure on the packaging material. If too much air is extracted, exceeding the tensile strength bearing range of the packaging material, it will cause tearing at the weak points of the packaging material, affecting the vacuum packaging effect. Therefore, the ideal volume range is determined considering the tensile strength.

[0072] In a specific embodiment, the lower limit of the volume range = initial air volume × influence coefficient / preset influence coefficient. According to the ideal gas state equation, the upper limit of the volume range = (initial pressure × initial air volume) × influence coefficient / (initial pressure - maximum negative pressure) × preset influence coefficient. The value of the preset influence coefficient is 0.3 - 0.5, and the ideal volume range is [lower limit of the volume range, upper limit of the volume range]. In practice, the value ranges and preferred values of the upper limit of the volume range, the lower limit of the volume range, the preset influence coefficient, and the ideal volume range can be determined according to the actual situation, which are not specifically limited here and will not be elaborated further.

[0073] The present invention considers the influence coefficient of the packaging environment on the elastic modulus of the packaging material, as well as the initial air volume and tensile strength to jointly determine the upper limit and lower limit of the volume range of the extracted air during vacuum pumping to determine the ideal volume range, which is convenient for further judging the degree of vacuum packaging defects, thereby further ensuring the quality and efficiency of vacuum packaging and improving the scientificity and accuracy of vacuum packaging.

[0074] Specifically, in step S23, the first relative deformation degree of the packaging material is determined according to the real-time elastic modulus, the influence coefficient, and the internal and external pressure difference, the second relative deformation degree of the packaging material is determined according to the displacement information, and the deformation degree is determined according to the first relative deformation degree and the second relative deformation degree.

[0075] It can be understood that the real-time elastic modulus reflects the ability of the packaging material to resist elastic deformation, and the internal and external pressure difference can intuitively reflect the air extraction effect, and the influencing factors comprehensively consider the influence of environmental temperature and humidity on the packaging material. When the environmental temperature and humidity change, the physical properties of the packaging material will change, affecting its deformation under pressure. Combining the real-time elastic modulus, the influence coefficient, and the internal and external pressure difference factors realizes a comprehensive consideration of various aspects such as material characteristics, external forces, and environmental impacts. The displacement information intuitively reflects the actual deformation of the packaging material during the vacuum packaging process. By measuring the displacement of certain points or parts on the packaging material, the amount of its position change can be directly obtained to determine the second relative deformation degree.

[0076] In a specific embodiment, before vacuum pumping, image processing technology is used to mark and locate the feature points of the packaging pattern on the surface of the packaging material. By continuously monitoring the displacement information of the feature points during the vacuum pumping process, the deformation degree of the packaging material can be determined. The numerical values of the first deformation degree and the second deformation degree are normalized. The deformation degree is the weighted sum of the first relative deformation degree and the second relative deformation degree. The first weight of the first relative deformation degree is 0.3, and the second weight of the second relative deformation degree is 0.7. In practice, the value range and preferred values of the first weight and the second weight can be determined according to the actual situation, and no specific limitation is made here. As long as the sum of the first weight and the second weight is 1, it will not be elaborated here.

[0077] The present invention comprehensively considers the self-attributes of the packaging material, environmental factors and pressure to determine the first relative deformation degree, determines the second relative deformation degree based on the actual displacement measurement of the surface pattern of the packaging material, combines the first relative deformation degree and the second relative deformation degree, and more comprehensively and accurately judges the deformation degree of the packaging material in vacuum packaging, which is convenient for further judging the degree of vacuum defects, thereby further ensuring the quality and efficiency of vacuum packaging and improving the scientificity and accuracy of vacuum packaging.

[0078] Please refer to Figure 3 as shown in Figure 3 which is a step diagram for determining the first relative deformation degree in an embodiment of the present invention. Specifically, in step S23, it includes:

[0079] Step S2311: Determine the force applied to the packaging material according to the internal and external pressure difference and the force-bearing area of the packaging material;

[0080] Step S2312: Determine the stress of the packaging material according to the cross-sectional area of the packaging material and the force;

[0081] Step S2313: Determine the first relative deformation degree according to the stress and the real-time elastic modulus.

[0082] In a specific embodiment, the internal and external pressure difference is the difference between the standard atmospheric pressure and the pressure inside the vacuum packaging. The packaging material is rectangular, so the force-bearing area of the packaging material is the area of the two rectangular sides. The force applied to the packaging material = the product of the internal and external pressure difference and the force-bearing area. The cross-sectional area is the cross-sectional thickness of the packaging material. The stress is the ratio of the force to the cross-sectional area. The first relative deformation degree = stress / (influence coefficient × real-time elastic modulus). In practice, the shape of the packaging material can be determined according to the shape of the corn to be packaged and the actual packaging requirements, and no specific limitation is made here, nor will it be elaborated.

[0083] Please refer to Figure 4 as shown in Figure 4This is a step diagram for determining the second relative deformation degree in an embodiment of the present invention. Specifically, in step S23, it includes:

[0084] Step S2321: Determine the vacuum distance and strain direction between each feature point according to the lateral displacement and longitudinal displacement corresponding to each feature point;

[0085] Step S2322: Determine the strain degree in the corresponding strain direction according to the vacuum distance and the initial distance;

[0086] Step S2323: Determine the second relative deformation degree according to the strain degree.

[0087] It can be understood that when air is evacuated during vacuum packaging, an internal and external pressure difference will be generated. This internal and external pressure difference will exert a force on the packaging material, causing the packaging material to stretch and compress, thereby generating stress. By judging the strain direction, the packaging deformation position of the packaging material during air evacuation can be determined, which is convenient for subsequently determining the main strain direction of the packaging material to determine the deformation degree.

[0088] In a specific embodiment, the relative distance between each feature point during vacuum pumping, that is, the vacuum distance, can be determined according to the positions of each feature point, the lateral displacement, and the longitudinal displacement. If the vacuum distance between two feature points is greater than the preset distance, the direction vector direction of these two feature points is defined as the strain direction. The value range of the preset distance is 0.8 cm to 1.5 cm. Preferably, the value of the preset distance is 1 cm. The strain degree in the strain direction = (initial distance - vacuum distance) / initial distance, and the initial distance is the original distance between the two feature points corresponding to the strain direction before vacuum packaging. Sort the magnitudes of the strain degrees corresponding to several strain directions to form a strain degree set, and the second relative deformation degree is the average value of the sum of the strain degrees in the first 50% to 70% of the strain degree set. In practice, the second relative deformation degree can be determined according to the actual situation, which is not specifically limited here and will not be elaborated further.

[0089] The present invention determines the vacuum distance and strain direction between each feature point according to the WeChat information of each feature point, and combines the vacuum distance and the initial distance to determine the strain degree in the corresponding strain direction to determine the second relative deformation degree, which is convenient for further determining the deformation degree of the packaging material according to the first relative deformation degree and the second relative deformation degree, thereby further determining the defect degree, ensuring the quality and efficiency of vacuum packaging, and improving the scientificity and accuracy of vacuum packaging.

[0090] Specifically, in step S23, determining the defect degree includes:

[0091] If the volume of the evacuated air is within the ideal volume range and the deformation degree is less than or equal to the preset deformation threshold, the defect degree is 0;

[0092] If the volume of the extracted air exceeds the ideal volume range and the degree of deformation is greater than or less than the preset deformation threshold, the degree of defect is determined based on the volume of the extracted air, the ideal volume range, the degree of deformation, and the preset deformation threshold.

[0093] It can be understood that the preset deformation threshold is the degree of deformation of the packaging material after normal vacuum packaging of corn. The volume of the extracted air is the actual amount of air extracted during the vacuum packaging of a single packaging material. If the volume of the extracted air is within the ideal volume range and the degree of deformation meets the preset deformation threshold, it indicates that the corn has reached the ideal vacuum degree, and the packaging material and the corn are closely attached without gaps. If the volume of the extracted air exceeds the ideal volume range, or the degree of deformation is greater or less than the preset deformation threshold, it indicates insufficient or excessive vacuum. Insufficient vacuum indicates that there is still residual air in the packaging material, and the packaging material is not closely attached to the corn. Excessive vacuum indicates that too much air has been extracted from the packaging material, and the packaging material is too closely attached to the corn, which easily causes uneven stress on the corn and damage to the grains, affecting the quality of the corn.

[0094] In a specific embodiment, the value range of the preset deformation threshold is 0.3 to 0.5. Preferably, the preset deformation threshold is 0.45. If the volume of the extracted air is less than the lower limit of the volume range, the degree of defect = (lower limit of the volume range - volume of the extracted air) × |preset deformation threshold - degree of deformation| / (lower limit of the volume range × preset deformation threshold). If the volume of the extracted air is greater than the upper limit of the volume range, the degree of defect = (upper limit of the volume range - volume of the extracted air) × |preset deformation threshold - degree of deformation| / (upper limit of the volume range × preset deformation threshold).

[0095] The present invention determines the degree of vacuum packaging defect through the ideal volume range and the preset deformation threshold, realizes the precise grading of vacuum packaging defects, provides a basis for quality control, facilitates workers to determine problems in the production process in a timely manner according to the judgment result of the degree of defect, realizes fault tracing, helps to further improve the production process, and improves the production quality. It enhances the scientificity and accuracy of vacuum packaging.

[0096] Specifically, in step S23, determining the adjustment method for the initial vacuum degree includes:

[0097] If the volume of the extracted air is greater than the upper limit of the volume range and the degree of deformation is greater than the preset deformation threshold, the initial vacuum degree is reduced;

[0098] If the volume of the extracted air is less than the lower limit of the volume range and the degree of deformation is less than the preset deformation threshold, the initial vacuum degree is increased.

[0099] It can be understood that when the volume of the extracted air is greater than the ideal volume range, the degree of deformation is relatively large: This situation may be caused by too high a vacuum degree, resulting in excessive extraction of air, and the vacuum degree can be appropriately reduced. When the volume of the extracted air is less than the lower limit of the volume range and the degree of deformation is less than the preset deformation threshold: It indicates that the vacuum degree is slightly low and the ideal vacuum state has not been achieved inside the packaging material, so the initial vacuum degree is increased.

[0100] In a specific embodiment, the value range of the vacuum degree adjustment amount is 3% - 5% of the initial vacuum degree. Preferably, the value of the vacuum degree adjustment amount is 3.5%. The value range of the initial vacuum degree is 0.08 - 0.09 MPa. In practice, the value range and the preferred value of the vacuum degree adjustment amount and the initial vacuum degree can be determined according to the actual situation, and no specific limitation is made here and will not be elaborated further.

[0101] In a specific embodiment, the adjustment method of the air extraction time can also be determined according to the volume of the extracted air and the degree of deformation. If the volume of the extracted air is greater than the upper limit of the volume range and the degree of deformation is greater than the preset deformation threshold, the air extraction time is reduced; if the volume of the extracted air is less than the lower limit of the volume range and the degree of deformation is less than the preset deformation threshold, the air extraction time is increased.

[0102] So far, the technical solution of the present invention has been described in combination with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A production process for vacuum-packed roasted corn, characterized in that: include: Step S1, peeling the corn to be processed, removing impurities, distinguishing grades, and washing and drying the corn of each grade; Step S2, baking the dried corn, and vacuum packaging it after cooling, wherein: Step S21, determining the influence coefficient of the packaging environment on the packaging material according to the historical ambient temperature, historical ambient humidity and historical elastic modulus of several packaging materials in the vacuum packaging environment; Step S22, during the vacuuming process, determining the initial air volume in the packaging material according to the volume of the corn to be packaged, the porosity of the corn and the volume of the packaging material, and determining the ideal volume interval of the extracted air according to the initial air volume, the influence coefficient and the tensile strength of the packaging material; Step S23, during the vacuuming process, monitoring the internal and external pressure difference of the packaging material and the displacement information of the characteristic points of the packaging pattern on the surface of the packaging material, determining the deformation degree of the packaging material according to the real-time elastic modulus, the influence coefficient, the internal and external pressure difference and the displacement information, and determining the defect degree of the vacuum packaging and the adjustment method of the initial vacuum degree according to the comparison result between the ideal volume interval and the evacuated air volume and the deformation degree; Wherein, the displacement information includes the lateral displacement and longitudinal displacement of the corresponding feature point of the surface packaging pattern; Step S3, sterilizing the vacuum-packed corn and storing it in a warehouse.

2. The production process of vacuum-packed roasted corn according to claim 1, characterized in that: In step S21, a first relationship model is constructed according to the historical ambient temperature and the historical elastic modulus, a second relationship model is constructed according to the historical ambient humidity and the historical elastic modulus, the temperature influence factor is determined according to the first relationship model, the humidity influence factor is determined according to the second relationship model, and the influence coefficient is determined according to the temperature influence factor and the humidity influence factor.

3. The production process of vacuum-packed roasted corn according to claim 1, characterized in that: In step S22, corn images of the corn to be packaged are collected based on several angles, the particle area and the void area are determined according to the corn image, the porosity of the corn is determined according to the area of ​​the particle area and the area of ​​the void area to determine the actual solid volume of the corn, and the initial air volume is determined according to the actual solid volume and the volume of the packaging material.

4. The production process of vacuum-packed roasted corn according to claim 1, characterized in that: In step S22, the lower limit of the volume interval is determined according to the initial air volume and the influence coefficient, the upper limit of the volume interval is determined according to the initial air volume, the influence coefficient and the tensile strength, and the ideal volume interval is determined according to the lower limit and the upper limit of the volume interval.

5. The production process of vacuum-packed roasted corn according to claim 4, characterized in that: In step S22, the maximum negative pressure that the packaging material can withstand is determined according to the tensile strength, and the upper limit of the volume range is determined according to the initial pressure, the maximum negative pressure, the initial air volume and the influence coefficient in the packaging material.

6. The production process of vacuum-packed roasted corn according to claim 1, characterized in that: In step S23, the first relative deformation degree of the packaging material is determined according to the real-time elastic modulus, influence coefficient and internal and external pressure difference, the second relative deformation degree of the packaging material is determined according to the displacement information, and the deformation degree is determined according to the first relative deformation degree and the second relative deformation degree.

7. The production process of vacuum-packed roasted corn according to claim 6, characterized in that: In step S23, the force applied to the packaging material is determined according to the internal and external pressure difference and the force-bearing area of ​​the packaging material, the stress of the packaging material is determined according to the cross-sectional area of ​​the packaging material and the force, and the first relative deformation degree is determined according to the stress and the real-time elastic modulus.

8. The production process of vacuum-packed roasted corn according to claim 6, characterized in that: In step S23, the vacuum distance and strain direction between the feature points are determined according to the lateral displacement and longitudinal displacement corresponding to each feature point, the strain degree corresponding to the strain direction is determined according to the vacuum distance and the initial distance, and the second relative deformation degree is determined according to the strain degree.

9. The production process of vacuum-packed roasted corn according to claim 1, characterized in that: In step S23, determining the defect degree includes: If the extracted air volume is within the ideal volume range and the deformation degree is less than or equal to the preset deformation threshold, the defect degree is 0; If the extracted air volume exceeds the ideal volume interval and the deformation degree is greater than or less than the preset deformation threshold, the defect degree is determined based on the extracted air volume, the ideal volume interval, the deformation degree and the preset deformation threshold.

10. The production process of vacuum-packed roasted corn according to claim 8, characterized in that: In step S23, determining the adjustment method for the initial vacuum degree includes: If the volume of the extracted air is greater than the upper limit of the volume interval and the degree of deformation is greater than the preset deformation threshold, the initial vacuum degree is reduced; If the volume of the extracted air is less than the lower limit of the volume interval and the degree of deformation is less than the preset deformation threshold, the initial vacuum degree is increased.

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