161 results about "Modified atmosphere" patented technology

The invention discloses an intelligent modified atmosphere packaging film with gas selectivity and pH / humidity double response as well as a preparation method and application of the intelligent modified atmosphere packaging film. The preparation method comprises the following steps: mixing thymol emulsion and graphene oxide dispersion liquid, and stirring and reacting at room temperature in a dark place to prepare graphene oxide-thymol; the preparation method comprises the following steps: dissolving chitosan in an acetic acid aqueous solution, then adding graphene oxide-thymol and a plasticizer, and carrying out ultrasonic dispersion treatment to form a film-forming solution; and carrying out film forming treatment on the film forming solution by adopting a casting method to prepare the intelligent modified atmosphere packaging film with gas selectivity and pH / humidity double response. The prepared intelligent modified atmosphere packaging film can be modified automatically, is uniform and stable in structure, high in encapsulation efficiency, close in coordination, good in antibacterial and antioxidant activity and excellent in mechanical property and gas barrier property, can realize selective adsorption of gas, controls release of thymol by responding to changes of the pH value and humidity in the environment, and has a good application prospect. The method has a good application prospect in the field of fruit and vegetable preservation.

The invention discloses a modified atmosphere preservation system and method, and aims to improve the preservation suitability of vegetables of different categories and different maturity degrees. The modified atmosphere preservation system comprises a refrigeration house, the in-warehouse sensing unit is used for collecting environmental data in the refrigeration storage in real time; the outside-refrigeration-house sensing unit is used for collecting outside-refrigeration-house environment data in real time; the respiration rate prediction unit performs fruit and vegetable respiration rate prediction calculation according to the environmental data in the refrigeration house; and the set point vector calculation unit is used for performing system energy consumption prediction calculation based on the cold storage external environment data and the cold storage internal environment data, performing optimal solution calculation of the comprehensive optimization index according to an energy consumption prediction calculation result and a fruit and vegetable respiration rate prediction calculation result, and performing optimal solution calculation of the comprehensive optimization index according to an optimal solution calculation result of the comprehensive optimization index. Outputting an optimal environment parameter set point vector; the decoupling compensation unit is used for performing error calculation according to the in-library environment data and the optimal environment parameter set point vector; and the PID control unit is used for generating a control signal according to an error calculation result.

The invention relates to the technical field of fresh-keeping packaging of brasenia schreberi tender shoots, in particular to a fresh-keeping packaging method and system for brasenia schreberi tender shoots. The method comprises the following steps: pretreating brasenia schreberi tender shoots to induce pore closing of the brasenia schreberi tender shoots; performing glue protection treatment to form a composite glue protection film on the surfaces of the tender shoots; loading the treated brasenia schreberi tender shoots into a tender shoot packaging box integrated with a controlled atmosphere microcapsule release unit, and sealing, so as to realize shape integrity preservation of the brasenia schreberi tender shoots; sequentially carrying out water bath and ultrahigh pressure sterilization on the sealed tender shoot packaging box; and finally, refrigerating to realize fresh-keeping packaging of the brasenia schreberi tender shoots. On the basis of a box body structure of a multi-layer composite structure, in cooperation with an inner wall anti-sticking design and a built-in controlled atmosphere microcapsule release unit system, morphological integrity preservation of brasenia schreberi tender shoots is achieved, non-acidification and chemical preservative-free high-quality preservation can be achieved in combination with glue protection treatment and gradient physical sterilization of the brasenia schreberi tender shoots, and the preservation effect of the brasenia schreberi tender shoots is improved. And the colloid retention rate is greater than 95%.

The invention relates to the technical field of vegetable preservation, and discloses a broccoli intelligent storage and preservation environment control system, which comprises an intelligent management system, and is characterized in that the intelligent management system comprises a storage environment control module, an online multi-mode quality detection module, an analysis feedback module, an intelligent decision execution unit and an early warning reminding module; the online multi-mode quality detection module, the analysis feedback module, the intelligent decision execution unit and the execution mechanism are integrated to construct a set of complete fresh-keeping feedback control ring, and meanwhile, key indexes such as mildew, water loss rate, color, ethylene concentration and the like can be subjected to automatic online full detection; differentiated fresh-keeping measures such as precise humidity and temperature adjustment, modified atmosphere packaging and isolation treatment are automatically triggered based on the judgment result, the conventional extensive management mode depending on manual spot check and passive response is changed, problems can be found in real time and actively intervened in the storage process, loss is reduced, and the shelf life is prolonged.

The invention belongs to the technical field of fresh keeping, and discloses a high-maturity small white apricot ethylene regulation and dynamic controlled atmosphere synergistic fresh keeping method which comprises the following steps: after packaging by a special net cover, pre-cooling in time, and synchronously carrying out 1-MCP fumigation and stage I controlled atmosphere treatment; a refrigerator car transportation or common car heat preservation and cold storage transportation mode is adopted, and stage II controlled atmosphere treatment is synchronously carried out in the logistics link; transferring into a modified atmosphere packaging box of which the inner surface is covered with a photocatalytic fresh-keeping coating, entering a goods shelf, and synchronously carrying out stage III modified atmosphere treatment. According to the invention, a synergetic technology of ethylene dynamic control and self-adaptive adjustment of modified atmosphere parameters is adopted, a full-chain linkage fresh-keeping technology system covering production area-logistics-shelf is constructed, and the core problems of difficulty in ethylene sensitive fresh-keeping, link splitting, high cost and the like in the small white apricot industry are solved. The technology has been applied in Xinjiang Uygur autonomous region warehouse car and wheel platform demonstration bases, the shelf life of eight-mature small white apricots reaches 10-15 days, and the intact fruit rate is 92% or above and is prolonged by 3-5 times compared with a traditional technology.

The utility model provides a refrigerator which comprises a refrigerator body, a door body and a fresh-keeping module, the door body is connected to the refrigerator body, and the fresh-keeping module comprises at least one fresh-keeping space and a gas processing device communicated with the fresh-keeping space in an airflow mode. The gas treatment device is configured to change the proportion of specific gas in the fresh-keeping space through electrochemical reaction; wherein the fresh-keeping space and / or the gas treatment device are / is arranged on the door body; when the preservation module is used for achieving modified atmosphere preservation, the gas treatment device and / or the preservation space are / is arranged on the door body, and waste of the storage space in the box body can be reduced.

The invention relates to the technical field of food processing, in particular to a chicken quality preservation treatment method based on sectional regulation, which is characterized in that chicken is pretreated by a composite biological preservative solution, and ice storage treatment and staged storage are combined, so that microbial growth and enzymatic activity of the chicken are effectively inhibited; fat oxidation and protein degradation are delayed, so that the chicken still keeps excellent quality in long-term storage; in the staged storage process, key indexes are monitored in real time or periodically, a threshold value comparison and stage switching mechanism is established, and accurate dynamic regulation and control of the staged modified atmosphere packaging environment under the condition of dynamic deterioration of the chicken quality are achieved. Through segmented regulation and control, juice loss, color deterioration and decay of the chicken in the storage process can be effectively prevented, so that the sensory quality and the nutritional quality of the chicken are maintained, and meanwhile, the gas utilization efficiency in the storage environment is also remarkably improved.

The present application provides a kind of fresh-cut tuber vegetables' hydrogel spontaneous modified atmosphere coating preservative and preservation method, belongs to the technical field of preservative.The fresh-cut tuber vegetables' hydrogel spontaneous modified atmosphere coating preservative of the present application includes hydrogel particle, film-forming base and edible plasticizer, the mass addition amount of the hydrogel particle in film-forming base is 0.01% to 3.00%, film-forming base is the chitosan solution with mass concentration of 0.2% to 5%, and edible plasticizer includes one or more of gelatin, glycerol or polyethylene glycol.The present application adds loose porous hydrogel into film-forming base solution to prepare preservative, and the preservative is coated on fresh-cut tuber vegetables such as lotus root to form a layer of edible film on the surface of fresh-cut tuber vegetables, the film uses hydrogel particle as atmosphere " switch " to control the microenvironment of the atmosphere around the vegetables, reduce water loss, thereby reducing the browning and water loss of fresh-cut tuber vegetables, and prolonging the shelf life.

The invention provides a bean product freshness-locking manufacturing process using liquid nitrogen. The bean product freshness-locking manufacturing process comprises the following steps: (1) pretreatment; (2) liquid nitrogen rapid cooling; (3) temperature balancing; and (4) packaging and refrigerating. The bean products are treated through the composite fresh-keeping liquid in the pretreatment stage, surface microorganisms of the bean products can be effectively inhibited, a foundation is laid for follow-up steps, in the follow-up treatment process, the bean products are quickly frozen through liquid nitrogen, the bean products can be quickly cooled, and glassy ice layers are formed on the surfaces of the bean products, so that the bean products are quickly preserved. Oxygen is physically isolated, moisture is locked, and meanwhile, the cooling rate is accurately controlled, so that tiny and uniformly distributed ice crystals and fixed microstructures are formed in the bean product, and a protein network structure in the bean product is not damaged, so that the problems of juice loss and texture collapse after unfreezing are solved; finally, a stable and low-oxygen storage environment is provided, long-acting preservation of bean products can be achieved, and the quality can be kept.

The utility model relates to the technical field of packaging machines, and provides a film tensioning device of a modified atmosphere packaging machine, which comprises a packaging table, one end of the top of the packaging table is screwed with a wind-up roll, the other end of the top of the packaging table is screwed with a conveying roll, and one end of the wind-up roll is welded with a driving rod; according to the film tensioning device of the modified atmosphere packaging machine, a gear motor is pushed outwards through an electric push rod, then a driving rod and a driving pipe are separated, a winding roller stops winding, when the driving pipe moves outwards, a first connecting rod drives a second connecting rod to be bent, the second connecting rod drives a push plate to move backwards, and after a transverse rod loses supporting of the push plate, the winding roller is driven to rotate. And when the vertical rod moves downwards, the top plate moves synchronously, so that the rubber block is attached to the top of the conveying roller to press a thin film on the conveying roller, the situation that the conveying roller rotates continuously due to inertia, the thin film is sent out, and the thin film is loose is avoided, and the packaging quality is improved.

The invention belongs to the technical field of food packaging materials, and discloses a photodynamic antibacterial modified atmosphere film as well as a preparation method and application thereof. The antibacterial modified atmosphere membrane is obtained by drying a membrane casting solution, the membrane casting solution comprises the following components in percentage by mass: 80-95% of anionic waterborne polyurethane emulsion, 5-20% of cationic quaternized nanocellulose and an antibacterial agent inclusion compound which accounts for 1-10% of the total mass of the components, and the antibacterial agent inclusion compound is a curcumin-cyclodextrin inclusion compound. The transparent film which has good compatibility and obviously improved air conditioning performance and mechanical performance is successfully prepared, the film has excellent antioxidant and photodynamic antibacterial functions, and the defect that an existing film is single in function is overcome. When the functional waterborne polyurethane film is applied to strawberry preservation, the oxidation and corruption process of strawberries is effectively delayed, the purpose of prolonging the preservation period is achieved, reliable support is provided for preparation of the functional waterborne polyurethane film and food preservation application, and the functional waterborne polyurethane film has important theoretical and practical significance.

The utility model discloses a spontaneous type modified atmosphere packaging for strawberry fresh -keeping, including the packing box of no lid and the food packaging bag of covering in packing box outside, packing box long 16~20cm, wide 11~15cm, high 3~5cm, and the both ends of food packaging bag are sealed, and at least one opening is arranged on the surface, and the total area of opening is 3~5cm 2 , and the opening is covered by PDMS film. The utility model overcomes the problems of poor fresh -keeping effect of the prior art strawberry packaging and the problems of complex operation and high cost of active type modified atmosphere packaging.

The utility model belongs to the technical field of food packaging, and particularly relates to a nuclear track membrane spontaneous type controlled atmosphere patch for fresh keeping of a fruit and vegetable box and the fruit and vegetable box. The spontaneous controlled atmosphere patch of the nuclear track membrane for fresh keeping of the fruit and vegetable box comprises a nuclear track membrane layer, an inner protection layer and an outer protection layer are arranged on the two sides of the nuclear track membrane layer respectively and are of a net structure, a plurality of annular adhesive layers are arranged on the side, away from the nuclear track membrane layer, of the inner protection layer, and the outer protection layer is arranged on the side, away from the nuclear track membrane layer, of the outer protection layer. Each annular adhesive layer is a single adhesive layer, each single adhesive layer is made of the same adhesive, and adjacent single adhesive layers are made of different adhesives. The modified atmosphere patch is of a three-layer structure, so that the refreshing time of fruits and vegetables can be prolonged; the fruit and vegetable box adhesive has a good bonding effect with various fruit and vegetable boxes made of different box materials, and is convenient and fast to use.

The utility model relates to the technical field of psychotherapy, in particular to a feeding device of a modified atmosphere packaging machine, which comprises a base, an operating platform is fixed at the top of the base, a top plate is fixed at the output end of a third cylinder through a bolt, and a first mounting groove is fixed at the top of a packaging equipment main body through a bolt. The two sides of the interior of the first mounting groove are each provided with a first air cylinder, the output ends of the two first air cylinders are each fixedly provided with a supporting sliding block, the bottom ends of the two supporting sliding blocks slidably extend out of the interior of the first mounting groove, and the bottoms of the two supporting sliding blocks are each fixedly provided with a second air cylinder; the output end of the second air cylinder is fixedly provided with a driving assembly, and two clamps are movably installed below the driving assembly. According to the packaging box clamping and discharging device, the packaged packaging box can be clamped and discharged, so that a packaging film is prevented from being torn, and the situation that the packaging film is damaged is avoided.

The invention discloses a modified atmosphere packaging machine with a novel replacement structure, a lower die is located right below a laminating heat-sealing cutting mechanism, and the lower die comprises a hollow lower die base, a gas replacement structure plate, a connecting plate and a packaging box tray; the gas replacement structural plate is fixed to the upper end of the lower die base and provided with a plurality of die cavities which correspond to the heat-seal cutting devices in position one to one and are used for containing packaging boxes, the feeding side edge of each die cavity is provided with a multi-angle gas inlet structure, and the discharging side edge of each die cavity is provided with a gas outlet. The connecting plate is located below the lower die base and fixedly connected with the rack, the packaging box tray is arranged in the lower die base and fixedly connected with the connecting plate through a support, at least one air cylinder is fixed to the lower end face of the connecting plate, and telescopic rods of the air cylinders are fixedly connected with the lower die base. Multi-angle gas injection replacement is adopted, dead angles are avoided, gas in the packaging box is replaced more thoroughly, and the replacement precision and replacement efficiency of the gas in the packaging box are remarkably improved.

This invention discloses a method for extending the storage time of peaches, a composite plasma-activated water system, and a preservation system, belonging to the field of post-harvest preservation of fruits and vegetables. The method uses a quaternary gas mixture of argon, oxygen, carbon dioxide, and helium to prepare plasma-activated water through discharge. A specific ratio of tea polyphenols and chitosan is then added to obtain composite plasma-activated water. Combined with gentle pre-cooling, light-protected ultrasonic atomization spraying, and modified atmosphere buffering, this achieves a synergistic effect of antibacterial activity, water retention, antioxidant properties, and flavor preservation. This method can reduce the total bacterial count, rot rate, and weight loss rate of peaches during storage, maintain fruit firmness, enhance the activity of endogenous antioxidant enzymes, reduce malondialdehyde accumulation, and effectively retain soluble solids and titratable acids, among other flavor compounds. The process of this invention is green and mild, with no chemical residues, and can delay flesh softening and peel browning, thus extending the storage time and shelf life of peaches.

The invention relates to a method and device for performing ripening control on fruits and vegetables based on an air-conditioned cold storage, and the method comprises the steps: obtaining an input ripening control instruction; different ripening modes correspond to different target parameters; generating a corresponding ripening control mode based on the ripening control instruction; and executing each ripening control stage based on the ripening control mode, and obtaining a real-time state vector of the fruits and vegetables in the corresponding ripening control stage, so as to determine whether to adjust an instruction in the regulation and control instruction set to adjust the environment parameter preset track based on a comparison result of the real-time state vector and the target state vector. Therefore, ripening control of fruits and vegetables is realized. By means of the control method and device, the problem that in the prior art, due to the fact that an air-conditioned cold storage adopts fixed gas parameters and control strategies, differentiated requirements of users cannot be met is solved.

The present application relates to the field of illumination and modified atmosphere combined preservation technology, and discloses a method for preserving litchi and maintaining Vc of litchi by using LED illumination combined with modified atmosphere packaging. The method comprises the following steps: picking fresh litchi, immediately screening out litchi without disease and insect pests and mechanical damage, retaining complete fresh branches and leaves, and precooling the screened litchi; after the precooling of the litchi, the dry end of the litchi is immersed in a nutrient supplement hydrogel, the litchi is placed flat, is packaged by using a fruit and vegetable film, and a slow-release antibacterial sheet is arranged inside; the packaged litchi is placed in a thermostat with an ambient temperature of 4-10 DEG C and a humidity of 85-95% for preservation, and the illumination intensity of white light or red and blue light is 70-90 μmol·m ‑2 ·s ‑1 The present application uses red and blue light combination, white light illumination to promote photosynthesis to form an internal microcirculation system for low-temperature storage for the first time to preserve litchi, effectively prevents loss of nutritional ingredients, and can also increase the vitamin C content of litchi to a certain extent.

The utility model relates to the technical field of fresh-keeping packaging, and discloses a modified atmosphere fresh-keeping packaging machine which comprises two conveying assemblies, a conveying belt is arranged in each conveying assembly, the two conveying assemblies are arranged in an L shape, a pushing assembly is arranged above one conveying assembly, the pushing assembly corresponds to the other conveying assembly in position, and the conveying belt is arranged above the pushing assembly. A pushing assembly is arranged on one conveying belt, a discharging assembly and a collecting assembly are arranged above the conveying assembly on the side away from the pushing assembly, the food boxes are conveyed through the two conveying assemblies, the food boxes are conveniently pushed to the other conveying belt through the pushing assembly, and the multiple food boxes are limited through a limiting assembly; and then the material collecting assembly pulls the sealing film, the guiding assembly plays a role in guiding the sealing film, then the heat sealing assembly plays a role in sealing the food box with the film, intervention of workers is reduced, mechanical automation engineering is enhanced, and the food film sealing and packaging efficiency is improved.

The application discloses a nuclear pore membrane modified atmosphere packaging device production system, which comprises a mother piece feeding mechanism, a nuclear pore membrane cutting mechanism, a sub piece feeding mechanism and a multiple-speed chain conveying line. The automatic feeding of the mother piece and the sub piece is realized through the mother piece feeding device and the sub piece feeding device, and the automatic cutting of the nuclear pore membrane during the assembling process of the nuclear pore membrane and the sub piece is realized through the nuclear pore membrane cutting device. The overall assembling of the nuclear pore membrane modified atmosphere packaging device is realized to be automatic, the working efficiency of the assembling is obviously improved, and the qualified rate of the finished product is improved.

The invention provides a slicing preservation method for fruits and vegetables, which comprises the following steps: firstly, cleaning, peeling, denucleating and deseeding complete fruits and vegetables, and then slicing the fruits and vegetables in a low-temperature environment by using a disinfected cutter; completely immersing the obtained slices in a composite fresh-keeping solution for treatment; taking out the treated slices, using filtered and sterilized low-temperature high-speed air flow to blow away residual liquid on the surfaces, and then sealing the slices and a modified atmosphere preservative in a high-barrier packaging bag; the packaged fruit and vegetable slices are placed in a low-temperature environment to be stored and transported; the low-temperature composite fresh-keeping liquid containing the edible calcium salt, the antioxidant and the pH regulator is adopted for treating the slices, juice loss and tissue softening caused by cutting are reduced, meanwhile, the low-pH environment and the antioxidant act jointly, the activity of polyphenol oxidase and other enzymes is greatly inhibited, and therefore enzymatic browning is prevented, and the fresh-keeping effect is good. And the fresh appearance color of the product is kept.

This utility model relates to the technical field of fresh-keeping storage boxes, and discloses a foldable fresh-keeping container for modified atmosphere storage of lychees. It includes a lid, a box body slidably connected to the lower surface of the lid, and symmetrically arranged air inlets and outlets inside the box body. Connecting block one and connecting block two are fixedly connected to one side of the outer wall of the box body. A lead screw is rotatably connected to the inner wall of connecting block one and connecting block two, and a limiting block is threaded to the outer wall of the lead screw. A telescopic assembly is provided inside the box body; the telescopic assembly includes a second tension tube, a first telescopic rod, and a second telescopic rod. The outer wall of the second tension tube is fixedly connected to the inside of the box body, and one end of the first telescopic rod is fixedly connected to the inner wall of the box body. In this utility model, when telescopic folding is required, the first and second tension tubes can support telescopic folding, and the first and second telescopic rods provide internal support and fixation. The first telescopic rod compresses and tightens the first telescopic spring inside the second telescopic rod.

1. The name of the design product: portable air-conditioning fresh-keeping packaging box. 2. The use of the design product: packaging box for containing melons, fruits and vegetables, etc. and playing the role of air-permeable fresh-keeping. 3. The design points of the design product: in shape. 4. The picture or photo best indicating the design points: perspective view. 5. Other circumstances needing to be explained: the two hole positions in the left view and the right view are air film holes.

According to the healthy and safe square bamboo shoot preservation method, an efficient and low-consumption square bamboo shoot preservation system is formed by improving an existing preservation technology, a microwave-hot water combined enzyme deactivation technology, a tea polyphenol color protection technology and a gradient liquid nitrogen quick freezing technology are adopted, the retention rate of vitamin C is increased, the difference between the crispness of unfrozen square bamboo shoots and the crispness of fresh bamboo shoots is smaller, and the browning rate is lower. Ultrasonic cleaning is combined with nano modified atmosphere packaging, so that the total number of bacterial colonies can be reduced, and the shelf life can be prolonged; through high-voltage pulse electric field pretreatment and magnetic field assisted freezing storage, the diameter of ice crystals is reduced to below 20 microns, and mechanical damage of the ice crystals to cell structures during quick freezing and unfreezing is reduced, so that it is ensured that the difference between unfrozen frozen products and fresh bamboo shoots is not too large, and the whole-chain quality guarantee from harvesting, processing to storage and transportation is achieved; the method is suitable for development of high-added-value products such as instant food and premade dishes, and promotes the square bamboo shoot industry to be upgraded to standardization and high-end.

1. The name of the design product: vacuum air conditioning packaging machine. 2. The use of the design product: vacuum air conditioning packaging for products. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective view.

[Problem] To provide a packaging device capable of appropriately responding to a change in a gas supply state, or as a specific example, a packaging device with which it is possible to predict an insufficient gas supply condition or gas supply stop condition and to respond to such conditions. [Solution] Provided is a packaging device for performing modified atmosphere packaging by sealing gas in a tray, the packaging device being characterized by including a supply gas detection part for detecting the state of gas supply means, and a control part for executing control related to gas replacement according to the state of the gas supply means detected by the supply gas detection part.

The utility model relates to the field of fresh-keeping of fresh and wet potato vermicelli, and discloses air-adjusting fresh-keeping equipment for fresh and wet potato vermicelli, which comprises an air-adjusting fresh-keeping packaging rack and a packaging film arranged on the right side of the air-adjusting fresh-keeping packaging rack, and a packaging table is arranged at the top end of the middle of the air-adjusting fresh-keeping packaging rack. A pre-storage assembly is arranged at the top end of the packaging table and comprises a moving table, dovetail blocks are fixedly connected to the front surface and the rear surface of the moving table, and storage racks are fixedly connected to the left side and the right side, close to the packaging table, of the middle of the air-adjusting fresh-keeping locking packaging rack. According to the utility model, the storage racks are arranged on the two sides of the packaging table to construct a cyclic operation mode of a pre-feeding station and a packaging station, so that the filling of the next batch of vermicelli can be completed during modified atmosphere packaging, and after packaging is completed, the packaged mobile table can be quickly moved out, and the mobile table to be processed can be quickly loaded without stopping the machine to wait for manual feeding and discharging; and the continuity and the overall packaging efficiency of the production line are improved.

Sliced ready-to-eat meat are provided by slicing ready-to-eat meat, disposing the meat into a flexible pouch with a modified atmosphere, and sealing the flexible pouch containing the meat. The flexible pouch is formed from material having: i) a thickness of from about 0.2 mils to about 2 mils; ii) an MVTR of about 1.2 g / 100 in2 / 24 Hrs @ 100° F., 90% RH, 1 atm or less; iii) an 02 Gas Transmission Rate of about 0.8 cc / 100 sqin / day or less at 1 atmosphere, 0% relative humidity and 73° F. or less; and iv) a clarity of about 80% or greater.

This invention discloses a non-thermal sterilization and flavor preservation process for pre-prepared wild vegetable dishes, relating to the field of food processing technology. The process includes: sequentially subjecting the wild vegetable raw materials to acidic plasma-activated water baths and alkaline plasma-activated water baths, with both baths supplemented by ultrasonic treatment; subsequently, acidic plasma-activated water nano-atomization treatment; followed by low-temperature vacuum impregnation and low-temperature vacuum dehydration; after seasoning and mixing, a three-layer edible coating film is formed on the surface, comprising a chitosan layer, a nanocellulose layer, and a chitosan layer containing plant essential oils; finally, modified atmosphere packaging and storage and transportation under cold chain conditions. This invention, through stepwise treatment of acidic activated water sterilization and alkaline activated water enzyme inactivation, combined with atomization supplementary sterilization, flavor impregnation, microcapsule sustained release, and multi-layer coating, improves the microbial safety and flavor quality preservation of pre-prepared wild vegetable dishes without the addition of preservatives.

The present invention provides a high-barrier, fresh-keeping, low-temperature heat-sealing composite film, and its production process and application. The composite film of the present invention is composed of a heat-sealing layer, a barrier layer, a reinforcement layer and a surface-treated layer from the inner layer to the outer layer, and the layers are bonded by an adhesive layer. The heat-sealing layer is made of modified polyethylene, polypropylene and a heat-sealing aid, and the barrier layer is made of a composite material of nano-alumina, polyvinylidene fluoride and ethylene-vinyl alcohol copolymer. The reinforcement layer is a polyester film, and the surface-treated layer is corona-treated. The composite film is prepared by a specific production process, including the steps of preparing the heat-sealing layer and the barrier layer, compounding, aging treatment and surface treatment. The composite film of the present invention has excellent barrier properties and low-temperature heat-sealing ability, is suitable for vacuum packaging or modified atmosphere packaging of food, and effectively extends the shelf life and quality assurance period of food.