222 results about "Modified atmosphere" patented technology

The invention provides a high-barrier fresh-keeping low-temperature heat-sealing composite film and a manufacturing process and application thereof, the composite film sequentially comprises a heat-sealing layer, a barrier layer, a reinforcing layer and a surface treatment layer from the inner layer to the outer layer, and the layers are bonded through bonding layers. The heat-sealing layer is prepared from modified polyethylene, polypropylene and a heat-sealing auxiliary agent, and the barrier layer is made of a composite material of nano aluminum oxide, polyvinylidene fluoride and an ethylene-vinyl alcohol copolymer. The enhancement layer is a polyester film, and the surface treatment layer is subjected to corona treatment. The composite film is prepared through a specific manufacturing process, and the specific manufacturing process comprises the steps of preparation of the heat sealing layer and the blocking layer, compounding, curing treatment, surface treatment and the like. The composite film disclosed by the invention has excellent barrier property and low-temperature heat-sealing capability, is suitable for vacuum packaging or modified atmosphere packaging of foods, and effectively prolongs the fresh-keeping period and the shelf life of the foods.

The invention discloses a master batch with a food fresh-keeping function. The master batch comprises the following components: 40-80 parts of PE resin; 5 to 30 parts of a nano composite antibacterial agent; 0.1 to 5 parts of a surfactant; 2-10 parts of a polyolefin elastomer; 5-25 parts of an organic gas adsorption material; 5-20 parts of a microporous modified atmosphere material; 1-25 parts of an antifogging agent; 0.1 to 10 parts of a lubricant; 0.1-5 parts of a dispersant; 0.1 to 1 part of an antioxidant; 0.1 to 3 parts of absolute ethyl alcohol; and 80 to 300 parts of ultrapure water. The master batch with the food fresh-keeping function has a broad-spectrum antibacterial effect, can reduce the rotting rate, the weight loss rate and the loss rate of fruits and vegetables in the production circulation link, adsorbs organic gas generated by respiration of the fruits and the vegetables, spontaneously adjusts the gas concentration content, and prolongs the fresh-keeping time and the shelf life of the fruits and the vegetables.

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 utility model relates to the technical field of packaging machines, and discloses a heat sealing mechanism of a box type modified atmosphere packaging machine, which comprises a main body mechanism and an auxiliary clamping mechanism, and the auxiliary clamping mechanism is positioned on the left side above the main body mechanism. According to the heat sealing mechanism of the box type modified atmosphere packaging machine, through the use of the main body mechanism, when the heat sealing mechanism is used, a driving motor in a fixing groove formed in the upper end of a connecting plate runs to drive a movable lead screw to rotate, a sliding block at the outer end of the movable lead screw moves rightwards to adjust the position, and the sliding block moves leftwards when the driving motor rotates reversely; the installation frame is fixed through the connecting rod, the electric push rod at the upper end of the installation frame operates to drive the push rod to move up and down for use, when the heating sealer is used, preheating is conducted firstly, then a bag needing to be sealed is placed below the heating sealer, and the heating sealer moves downwards to seal the bag. And the position of the heating sealer can be adjusted according to different requirements, and use is more convenient.

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%.

A microenvironment fresh-keeping refrigerator of the present invention relates to the field of electric appliances. A data acquisition module acquires the temperature, humidity, oxygen concentration, ozone concentration, negative ion concentration, air pressure, air quality data and stored object data of a microenvironment fresh-keeping chamber; a regulation and control device controls an inflation and extracting pump, a water supply and discharge pump, an adsorption type modified atmosphere device, a humidifying device, a refrigerating device, a superoxide generator, negative ion generators and catalyst controlled release devices on the basis of the acquired data in combination with internet big data and set data; various fresh-keeping elements such as air composition, airflow pressure, temperature and humidity, oxygen concentration, ozone concentration, negative ion concentration and air sterility and cleanliness in the refrigerator are regulated and controlled in an omnidirectional and multi-angle digital targeted mode; harmful residues on the surfaces of fruits and vegetables are degraded; harmless and thorough sterilization and disinfection are conducted; rotten elements and freshness loss factors are removed at fixed points; anti-corrosion and fresh-keeping elements are precisely maintained; nutritional components of fruits, vegetables, meat, fish and stored products and original freshness are kept rapidly and permanently; and a fresh-keeping refrigerator microenvironment with precise fresh keeping and comprehensive nutrition keeping is created.

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.

A container capable of maintaining a modified atmosphere may be formed from a single piece of corrugated cardboard. For example, a container may include a single piece of corrugated cardboard having a first side and a second side that includes four walls, a bottom, a top, two bottom flaps, two wall flaps, two wall fold overs, and a closing flap, wherein each of the foregoing have a first side corresponding to the first side of the corrugated cardboard and a second side corresponding to the second side of the corrugated cardboard. The single piece of corrugated cardboard with said features is configured to be folded into a container that, in an assembled-closed configuration, is capable of maintaining a modified atmosphere.

According to the method for prolonging the fresh-keeping period of the fruits by using the controlled atmosphere fresh-keeping box, the controlled atmosphere fresh-keeping box is prepared by improving the sealing performance of a common fresh-keeping box and covering a certain area of the common fresh-keeping box with a film, and the fruits are put into the box to be stored. When the area of the covering film is 20%, the lotus seeds are stored in a box, and 1-methylcyclopropene can be added; when the area of the covering film is 34.8%, the longan is placed in a box to be stored. Compared with the control, the modified atmosphere preservation box treatment can reduce the weight loss rate and browning degree of the lotus seeds and maintain the contents of Vc, amylose, total phenols and soluble solids; compared with a control group, the modified atmosphere preservation box treatment can inhibit browning of longan peel, delay reduction of soluble solids, acidity and vitamin C, inhibit increase of malondialdehyde content, reduce peroxidase activity and improve catalase activity and glutathione content. According to the technology, the shelf life of the fruits can be effectively prolonged, and the problems that an existing fresh-keeping method is tedious and short in fresh-keeping period are solved.

The invention relates to the technical field of fresh keeping, and particularly discloses a fruit and vegetable postharvest storage and transportation fresh keeping method based on a nano bacteriostatic agent, which comprises the following steps: cleaning and bacteria reducing: cleaning and bacteria reducing fruits and vegetables by adopting the nano bacteriostatic agent, then airing in an environment of 10-15 DEG C, and packaging the fruits and vegetables by adopting a modified atmosphere bag, then refrigerating and applying an external magnetic field in the process; a'biological + physical fresh-keeping 'technology of'nano bacteriostasis + modified atmosphere packaging + magnetic field' after fruit and vegetable picking is established, a nano bacteriostatic agent is used for modifying soybean protein, and a metal organic framework with high porosity and nanoscale and plant essential oil are fused in the nano bacteriostatic agent, so that the fruit and vegetable fresh-keeping agent has the advantages of no residue, long fresh-keeping time and the like; the method is high in preservation performance and capable of adsorbing pesticide residues, and has a wide application prospect in the field of fruit and vegetable preservation.

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 invention belongs to but is not limited to the technical field of agricultural product storage, and discloses a mutton quality improving and gradient processing storage method which comprises the steps of cold storage, ice temperature and freezing storage. A modified atmosphere fresh-keeping packaging method; applying a natural biological fresh-keeping technology; and carrying out full-chain storage management. Through comprehensive application of cold storage, ice temperature and freezing in combination with a modified atmosphere fresh-keeping packaging technology, the storage time of the mutton is remarkably prolonged, and meanwhile the excellent quality of the mutton is kept. The cold storage and ice temperature technology effectively inhibits the growth and enzymatic reaction of microorganisms, delays the oxidation process of the mutton, and maintains the color, texture and flavor of the mutton; the quick freezing and ultrasonic unfreezing technology is adopted, so that the damage to the cell structure of the mutton in the freezing and unfreezing process is reduced to the maximum extent. By optimizing the unfreezing process, juice loss is reduced, the unfrozen mutton still keeps good texture and taste, and the problem of quality loss in a traditional method is solved.

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 discloses a quality-guaranteeing storage method for fruit and vegetable products based on a cold storage long shelf life, and belongs to the technical field of fruit and vegetable product preservation. The method mainly comprises the following steps: pretreating fruit and vegetable products, preparing Zn / N-doped carbon quantum dots and a thin film, performing electrostatic field and magnetic field treatment, performing carbon quantum dot thin film packaging, performing modified atmosphere packaging, and finally performing refrigeration at 0-4 DEG C. The method can effectively maintain the texture and sense of the fruit and vegetable products, control the microbial growth rate of the fruit and vegetable products, and realize long-shelf-life quality-guaranteeing storage.

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 discloses a preservation method of tricholoma matsutake and an e-commerce transportation method. The invention discloses a fresh-keeping method of tricholoma matsutake on the first aspect. The fresh-keeping method comprises the following steps: S100, pre-cooling tricholoma matsutake; s200, putting the precooled tricholoma matsutake into a modified atmosphere packaging bag for sealed packaging; and S300, carrying out low-temperature sealed storage on the packaged tricholoma matsutake. According to the method, the tricholoma matsutake is pre-cooled and then sealed and packaged in a modified atmosphere packaging bag with specific modified atmosphere packaging parameters, so that a gas environment suitable for breathing of the tricholoma matsutake is formed in the packaging bag, the breathing intensity of the tricholoma matsutake is controlled, and the preservation time is effectively prolonged on the basis of keeping the original freshness and quality of the tricholoma matsutake.

The invention designs a fresh-keeping packaging film based on radiation refrigeration. The fresh-keeping packaging film comprises an ultraviolet shielding layer, a radiation refrigeration layer, a modified atmosphere layer and an antibacterial and antioxidant layer. And the ultraviolet shielding layer is prepared by selecting a PVA material and adding a lignin-loaded nanofiber tube, so that the photooxidation effect of ultraviolet rays can be effectively reduced. The radiation refrigeration layer utilizes a specific material (such as silicon dioxide and titanium dioxide) to realize an efficient radiation refrigeration effect, and purple cabbage anthocyanin (PKA) is added as a pH response dye. The modified atmosphere layer is composed of polyvinyl alcohol (PVA), polyvinylpyrrolidone (PVP), silica gel nanoparticles (JSNC) and the like, the transmittance of oxygen and carbon dioxide can be effectively controlled, and meanwhile the film is coated with an ethylene scavenger to slow down maturation and decay of food. The antibacterial and antioxidant layer is prepared by mixing melanin, polyphenol, essential oil (such as tea polyphenol and cinnamon essential oil), polycaprolactone (PCL) and gelatin (Gel) through an electrostatic spinning technology, so that the antibacterial and antioxidant layer not only has antioxidant performance, but also can effectively inhibit the growth of microorganisms.

The invention discloses a porous in-situ microfiber modified atmosphere preservative film as well as a preparation method and application thereof. The nanofiber porous film is prepared by combining an in-situ fiber forming technology with a solvent etching method, a good fresh-keeping effect of different fruits and vegetables is achieved by regulating and controlling the microstructure of the nanofiber porous film and accurately controlling the gas transmission rate, the fruits and vegetables can be kept fresh for 3-58 days, and a new method is provided for preparing the high-performance nanofiber porous fresh-keeping film. Meanwhile, the influence of the viscosity ratio, the fiber phase content, the traction rate and the rolling rate on the physical performance and the preservation effect of the preservative film is researched, and reference is provided for parameter selection of the porous in-situ microfiber modified atmosphere preservative film.

The invention belongs to the technical field of food processing, and discloses instant sea cucumber and an industrial preparation process thereof. A sea cucumber main material, a seasoning liquid, a water-retaining agent and a medicated food extracting solution are used as raw materials, a natural water-retaining agent composed of trehalose and konjac glucomannan is compounded, ultrasonic-assisted extracting solutions of astragalus membranaceus, poria cocos and angelica sinensis are combined to form a multi-target system, and a dynamic temperature-controlled sterilization process and a modified atmosphere packaging technology are adopted, so that the sea cucumber health-care food is prepared. Soft and tender taste, efficient reservation of nutrition and industrial production of the sea cucumbers are realized, the water retention rate of the product is increased by 55%, the polysaccharide retention rate is greater than or equal to 92%, the sodium content is less than or equal to 250mg / 100g, and the shelf life is up to 18 months.

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.