Agriculture, animal husbandry and fishery species cultivation nitrogen cavity constant temperature fresh-keeping protective film and multi-working-condition using method

Abstract

The application discloses an adaptive farming, animal husbandry and fishery planting nitrogen cavity constant-temperature fresh-keeping protective film and a multi-working-condition using method, belongs to the technical field of new materials for facility agriculture, and is provided with three types of cavity structures, namely, a double-layer cavity, a three-layer substrate double-nitrogen interlayer and a single-layer single-cavity nitrogen interlayer, and the heat insulation and cooling effect can reach 30% or above, and the cavity in the low-temperature environment is free of icing and condensation; the film body is matched with three types of sealing edges, namely, buckles, zippers and hot melt glue, an internal partition strip separates independent small air chambers to realize selective nitrogen filling in different zones, two types of charge and discharge valves are matched, nitrogen making equipment and external nondestructive temperature control detectors are matched, and differentiated gas supply logic is provided according to the differences among planting, livestock and poultry, aquatic products and fresh-keeping of fresh food. The application solves the defects of traditional agricultural films, such as large temperature difference, high nitrogen consumption, complicated management and poor scene adaptability, by means of double-layer isolation of the cavity, independent nitrogen filling in different zones and a double-mode gas nozzle structure, and has good energy-saving and carbon-reducing benefits.

Description

Technical Field

[0001] This invention belongs to the field of new materials for ecological agricultural facilities and the field of agricultural product preservation technology. Specifically, it is a nitrogen-filled constant temperature preservation protective film that is adapted to the entire agricultural, animal husbandry and fishery industry chain. It can be applied to the cultivation of fruit and vegetable seedlings, constant temperature feeding of livestock and poultry, temperature control of aquatic fish ponds and on-site preservation and storage of fresh agricultural products. By using a nitrogen-filled passive heat insulation structure, it reduces the energy consumption of temperature control equipment. With the matching recyclable membrane structure, it reduces the generation of agricultural film solid waste and promotes energy conservation and consumption reduction in agricultural production and a virtuous cycle of planting and breeding ecology. Background Technology

[0002] Facility agriculture urgently needs to be equipped with new low-energy heat insulation materials to promote energy conservation and carbon reduction in planting and breeding processes, reduce energy consumption for temperature control, and build an integrated green industrial system encompassing planting, breeding, harvesting, and storage.

[0003] Currently, over 90% of inflatable thermal insulation films on the market simply fill the interlayer with ordinary air, relying solely on gas to support the film. This results in weak heat insulation performance, leading to significant temperature fluctuations in greenhouses throughout the day and seasons. To maintain a constant temperature in the cultivation environment, continuous energy input for temperature control is required, resulting in high energy consumption and carbon emissions in agricultural production. Existing inflatable films do not differentiate between planting, livestock, aquaculture, and post-harvest preservation, and lack innovative structures with double-layer independent cavities within the cavities. They cannot simultaneously meet the diverse needs of single-plant closed seedling cultivation, flat planting across entire fields, and on-site storage of fresh produce. Furthermore, the cavity structure is simplistic, with most having only a single-layer air-filled cavity and lacking a three-layer substrate double-nitrogen interlayer for enhanced heat insulation. In low-temperature environments, the cavities are prone to icing and condensation, which is detrimental to stable crop growth.

[0004] Conventional wrapping films have limited sealing methods, lacking three types of comprehensive sealing solutions: buckles, zippers, and hot melt adhesives. This makes them unable to simultaneously meet the needs of frequent opening and closing, large-area rapid disassembly and assembly, and one-time high-airtightness storage. The air nozzle structure cannot be freely matched with check valves, resulting in either long-term air retention without rapid air release and storage, or convenient depressurization but poor airtightness. The range of membrane substrates is narrow, limiting the applicable scenarios. There is a lack of zoned differentiated nitrogen filling designs, requiring uniform nitrogen filling even in areas with underground soil cover and fishpond bottoms without insulation requirements, leading to high material costs. There is no external independent temperature measurement structure, requiring the destruction of the sealed cavity environment to detect internal temperature, making maintenance cumbersome. At the same time, the molded specifications of membrane spacers on the market are uniform, making it impossible to pre-fabricate the thickness and length of small air chambers according to different planting, breeding, and preservation conditions, resulting in poor adaptability. There is no supporting complete process for vacuuming and nitrogen filling, zoned individual nitrogen replenishment, and low-oxygen storage of fresh produce, making it difficult to fully support the low-carbon circular development needs of the entire agricultural, livestock, and fishery planting, breeding, and post-harvest preservation chain.

[0005] The few currently available nitrogen-insulated agricultural films only use a single-layer integral nitrogen sandwich structure, without an inner cavity structure with double-layer isolation, making it impossible to distinguish between the low-oxygen requirements of planting and fresh produce and the ventilation and oxygen supply requirements of livestock, poultry, and aquatic animals; the cavity has no partition strips, and the entire film is filled with nitrogen simultaneously, so the bottom of the fishpond and the soil-covered bottom areas without insulation continue to consume nitrogen, resulting in high material costs; the air nozzle has only a single structure, which cannot simultaneously meet the needs of long-term fixed laying for airtightness and seasonal disassembly and quick pressure relief for storage; there is no external non-destructive temperature measurement device, and detecting the internal temperature requires breaking the sealed cavity, making maintenance and operation cumbersome; the film sealing method is singular, and it cannot adapt to various working conditions such as single seedling cultivation, continuous greenhouses, and long-term storage, resulting in poor overall adaptability. Summary of the Invention

[0006] 1. Core cavity structure This nitrogen-filled constant temperature preservation protective film features three types of core cavity structures, adaptable to all agricultural working conditions. The insulation and cooling effect of all cavities can reach 30% or more. In low-temperature environments, the interior of the cavity does not freeze or condense, stably protecting the normal growth of crops.

[0007] The thickness of the small air chamber and the length of the spacers in this invention are standardized according to working conditions: the thickness of the thin chamber for fresh produce preservation is 2–6 mm, the thickness of the conventional chamber for field planting is 3–12 mm, and the thickness of the thickened chamber for livestock and poultry farming in cold regions is 5–20 mm; the length of the spacers is 0.3–3 m, and can be freely cut and heat-sealed according to the size of the greenhouse and the covering carrier; the standard pressure range for the interlayer inflation is 0.02–0.08 MPa, the low pressure range for the thin film is 0.02–0.04 MPa, and the pressure range for the thickened film is 0.05–0.08 MPa. In practice, the elasticity of manual pressure is used as an auxiliary filling verification standard. High-temperature working conditions refer to an ambient temperature ≥32℃, and low-temperature working conditions refer to an ambient temperature ≤5℃.

[0008] (1) Unique double-layer independent cavity within the cavity (core innovation) This design is applicable to only two scenarios: live animal cultivation and post-harvest preservation of agricultural products. For live animal husbandry and fisheries, a fully enclosed cavity is not used; instead, a double-layered membrane is laid flat with ventilation and oxygen supply. The membrane is an integral extension with pre-installed extended sealing edges, and its size can be infinitely enlarged or reduced. The shape can be square, rectangular, round, or various irregular shapes.

[0009] The double-layer cavity, triple-layer substrate double nitrogen jacket, and single-layer single-cavity nitrogen jacket are all produced by heat sealing process. The thickness and length of the small air chamber are pre-set according to the planting, livestock and poultry, aquatic products and post-harvest preservation conditions, and the factory-formed specifications are fixed.

[0010] The inner and outer cavities are completely isolated and do not allow air to pass between them: the outer layer is a nitrogen-insulated interlayer, and the inner layer is a sealed cavity for containing plants or fresh materials. Three locking and sealing methods are available: ① Buckle-press locking: the sealing edge has interlocking plastic buckle grooves, allowing for repeated opening and closing for reuse; ② Zipper sealing: equipped with an airtight plastic zipper, opening and closing smoothly, suitable for large-area cavities; ③ Hot melt adhesive fusion sealing: the sealing edge is integrally bonded, completely leak-free, a one-time seal, suitable for high-airtightness long-term storage.

[0011] The inner cavity is equipped with an external temperature control detector. The temperature probe extends into the inner layer, and the display terminal is located on the outside of the membrane. The internal temperature can be read in real time without removing the seal. In high-temperature conditions, an external fan can be used to assist in cooling.

[0012] The inner layer of the planting chamber is light-permeable, allowing natural light and ultraviolet rays to penetrate the membrane and ensure plant photosynthesis. The inner cavity of the post-harvest preservation chamber is first evacuated of air and then filled with nitrogen to create a low-oxygen environment, inhibiting the oxidation and decay of fruits, vegetables, flowers, livestock, and aquatic products.

[0013] (2) Three-layer substrate double nitrogen sandwich substrate structure The three-layer membrane substrate is integrally heat-sealed, with two independent nitrogen insulation interlayers inside. The double nitrogen layer enhances the insulation performance, reducing heat loss by 30% or more, making it suitable for extreme environments such as high-altitude cold and desert heat. The interlayer has integrally heat-sealed long strips and square block-shaped spacers. The spacers can also be set with wavy or dot-shaped heat-melted spacers to separate air chambers. During the heat-sealing process, the thickness and length of the small air chambers are preset according to the usage conditions, dividing them into independent small air chambers that are completely isolated or have reserved interconnection channels. If a single point is damaged, only the nitrogen in that area will be lost, and nitrogen can be replenished in separate areas. It can be laid flat alone as a greenhouse roof film, side film, partition film, or bottom film, or it can be processed as a substrate into cavity-within-cavity shapes.

[0014] (3) Single-layer single-cavity nitrogen interlayer economical structure The single nitrogen chamber is sandwiched between two layers of substrate film, which has a simple structure and lower production cost. It is suitable for conventional spring and summer planting sheds, livestock breeding sheds, and fish farming sheds that only require basic constant temperature protection. During the production stage, the thickness and length specifications of the corresponding small air chamber are matched to meet the basic heat insulation requirements.

[0015] 2. Differentiated nitrogen filling design for different zones The interlayer spacers divide the spacers into independent, unconnected small chambers, allowing for selective nitrogen filling based on installation location: exposed top membranes, side membranes, and the interlayer between the inner and outer chambers are filled with nitrogen as needed to create an insulation layer; areas below the buried soil layer and the bottom of fishponds, which do not directly face external temperatures, can be left unfilled with nitrogen, relying solely on the membrane substrate to isolate moisture and water penetration, thus saving materials. Each zone is independently controlled, with only the insulation areas requiring nitrogen filling, ensuring no interference between zones. During the membrane production and heat-sealing stage, the thickness and length of the small chambers are pre-set according to various operating conditions such as planting, livestock, aquaculture, and post-harvest preservation, resulting in fixed chamber specifications after molding.

[0016] Live fish pond operating conditions: Nitrogen is used to stabilize the temperature in the side walls and top layer, while the bottom area is not filled with nitrogen. The bottom cavity is isolated from the nitrogen cavities in the side walls and top. Only oxygen is introduced into the inner water culture cavity of the fish pond, and nitrogen cannot be introduced. The inner and outer cavities are completely isolated, and the gases will not mix.

[0017] 3. Selection and matching structure of air nozzle and check valve The outer nitrogen insulation interlayer is equipped with two types of basic gas nozzles, which can be installed individually or in combination in sections. Both types of gas nozzles can be equipped with built-in check valves as needed. The inflation needle nozzle and the press-type inflation / deflation nozzle can be replaced with threaded sealing nozzles and quick-connect pneumatic connectors, all of which fall within the protection scope of this invention. ① Basketball-style air needle nozzle: After adding a check valve, the air is automatically locked and there is no backflow. The airtightness is long-lasting, but it cannot release pressure quickly. It is suitable for fixed installation of sheds throughout the year. ②The same press-type inflation / deflation valve as the children's swimming ring: The inflation / deflation passage is always open in the version without a check valve. Pressing the valve core can quickly vent nitrogen. After the planting and preservation cycle is over, the film can be rolled up for recycling and reuse, which is suitable for seasonal disassembly and assembly scenarios.

[0018] It is equipped with large, medium and small nitrogen generators and nitrogen filling machines to complete the gas extraction and nitrogen filling operations. The equipment is equipped with a pressure indicator valve. The gas filling pressure is mainly 0.02-0.08MPa standard pressure, supplemented by manual pressure of the membrane body to control the filling degree. Thin membranes are filled less and thick membranes are filled appropriately.

[0019] The inner sealed cavity has a dedicated air inlet: air, oxygen, and nitrogen can be introduced in planting scenarios; only oxygen can be introduced in fish ponds; in post-harvest preservation scenarios, the air inside the cavity is first removed and then nitrogen is introduced to achieve low-oxygen preservation.

[0020] 4. Leak Repair and Routine Maintenance Routine inspections rely on manual pressing of the diaphragm to determine the nitrogen filling status. If the elasticity of a single area is weak when pressed, it indicates nitrogen loss or local leakage. In this case, only the nitrogen generator is connected to the dedicated nozzle for that area, and nitrogen is extracted and replenished separately. Other areas do not require depressurization. If a small chamber is damaged and leaking, it is repaired by heat-sealing with a diaphragm of the same material. After curing, the chamber is refilled with nitrogen.

[0021] 5. Selection range of membrane substrates The substrate for this membrane can be any one or more composite co-extruded moldings, without limiting the proportion of a single raw material, thus broadening the scope of patent protection: polyethylene series LDPE, LLDPE, metallocene mLLDPE membranes; EVA composite membranes; multi-layer co-extruded PO functional greenhouse films; PVC cold-resistant and heat-insulating films; PBAT, PLA, starch-based biodegradable films; TPU light-transmitting soft films, modified polypropylene woven light-switching agricultural films; it can also be combined with light-transmitting glass fiber, non-woven fabric, and heat-insulating foam soft sheets to enhance tear resistance and light transmission performance, and can be prepared as needed for thin light-transmitting films, thickened special films, light-transmitting roof films, and bottom heat-insulating films.

[0022] 6. Full Industry Chain Adaptation Instructions This invention provides a complete agricultural industry chain that integrates planting, breeding, cultivation, and post-harvest temperature-controlled preservation of agricultural products. The front end is used for field planting and cultivation of seedlings, fruits, vegetables, and flowers, while the flat-laid interlayer membrane is suitable for the temperature-controlled cultivation of livestock, poultry, and aquatic products. The rear end reuses the cavity structure to provide on-site sealed storage for harvested fruits and vegetables, fresh-cut flowers, slaughtered livestock and poultry meat, and aquatic products. It relies on the outer layer of nitrogen for temperature control and the inner layer of low-oxygen for preservation to inhibit the oxidation and decay of fresh produce, reduce the energy consumption of traditional cold storage, and reduce post-harvest losses of agricultural products. Beneficial effects

[0023] The system features three types of core cavity structures, with all cavities achieving a heat insulation and cooling effect of 30% or more. In low-temperature environments, the interior of the cavities does not freeze or condense, ensuring stable protection for normal crop growth. The system also features a unique double-layered cavity structure, allowing for differentiated use in different scenarios. The fully enclosed inner cavity is used only for planting and post-harvest preservation, while the inner cavity is simply laid flat with a membrane and ventilation and oxygen supply for live animal husbandry and fisheries, eliminating the risk of oxygen deficiency and suffocation in live animals. This system is suitable for the entire agricultural, livestock, and fishery industry chain.

[0024] The membrane sealing system offers three sealing options: buckles, zippers, and hot melt adhesive. It caters to various working conditions, including frequent disassembly and reassembly, large-area rapid opening and closing, and long-term high-airtightness storage. It is suitable for various carriers such as single seedling cultivation, large-scale greenhouses, and fresh food storage containers, with no restrictions on external dimensions.

[0025] The interlayer has built-in partitions to divide the space into independent small air chambers. During the production stage, the thickness and length specifications of the small air chambers are pre-set according to different working conditions, eliminating the need to adjust the insulation layer thickness on-site based on the amount of air. The membrane forming structure is stable, the insulation performance is standardized, and the difficulty of on-site nitrogen filling and debugging is reduced. At the same time, it supports differentiated nitrogen filling for the above-ground exposed area and the bottom ground / soil-covered area. Areas without insulation requirements can be left empty without nitrogen filling, saving consumables. Single-point damage results in only single-area leakage, and nitrogen can be replenished separately for each area without depressurizing the entire membrane, making maintenance convenient.

[0026] The two types of air nozzles can be freely equipped with built-in check valve structures. The type with a check valve has a long-lasting air retention and reduces the frequency of air replenishment, while the type without a check valve can quickly release pressure and recycle the film, making it suitable for both year-round fixed installation and seasonal disassembly / removal scenarios.

[0027] It is equipped with medium and small nitrogen generators and nitrogen filling machines. Before filling, the oxygen-containing air in the interlayer is removed. It relies on the low thermal conductivity and chemical inertness of nitrogen to achieve the dual effects of constant temperature and corrosion prevention. The external temperature control detector can read the internal temperature without disassembling the sealing edge. It can be equipped with an external fan to assist in temperature adjustment. The dual means stabilize the cavity temperature.

[0028] The membrane is transparent and does not block natural light or ultraviolet rays. The plants inside the planting cavity can complete photosynthesis normally in a closed environment, ensuring the stable cultivation of seedlings, fruits, vegetables and flowers.

[0029] The film substrate covers all mainstream agricultural film materials on the market, and can be single or composite co-extruded without being limited by the type of raw materials, thus broadening the scope of patent protection; the snap-on and zipper film bodies can be recycled and reused, reducing agricultural film waste and meeting the requirements of agricultural resource recycling and low-carbon ecological agriculture development.

[0030] Reduced consumption of consumables: By using a partitioned structure where the exposed above-ground areas are individually filled with nitrogen and the ground-level areas are left empty without nitrogen, nitrogen consumables consumption is reduced by 15%–45%, significantly reducing the long-term operating costs of planting, breeding, and preservation. Convenient operation and maintenance: The membrane is divided into independent small chambers. A single point of damage corresponds to the nitrogen loss of the corresponding zone. It can be connected to the zone's gas nozzle for nitrogen replenishment. There is no need to depressurize the entire membrane. The efficiency of repair and gas replenishment operation and maintenance is improved by more than 50%. Recyclable and low-carbon: The snap-on and zipper-sealed film can be completely depressurized and rolled up, and reused for 3-5 planting and breeding cycles, reducing the generation of disposable agricultural film waste, which is in line with the policy orientation of agricultural emission reduction and carbon sequestration, and green circular development.

[0031] This invention differs from existing single-layer nitrogen-filled agricultural films. Its core innovation lies in the combination of a double-layered isolation cavity within the cavity, independent small air chambers for nitrogen filling in different zones, two types of switchable air nozzles, and three types of sealing structures adapted to different working conditions. It also distinguishes between two independent gas supply logics for oxygen supply to live plants and low-oxygen storage of fresh produce. Existing nitrogen-filled agricultural films do not disclose all of the above combined technical features at the same time, thus possessing outstanding novelty and inventiveness. Detailed Implementation

[0032] Example 1: Planting and Cultivation Scenario The system employs an internal cavity structure, utilizing a three-layer substrate, double-nitrogen interlayer translucent membrane. During heat sealing during membrane production, medium-thickness, standard-length small air chambers are selected, with dimensions adjusted as needed. Individual seedlings are wrapped in small square shapes, while large-scale fields are covered with a single sheet of membrane. Zipper-style sealing is used for the edges; the interlayer is divided into a top and side nitrogen-filled zone, and a bottom soil-covered nitrogen-free zone; the air nozzles are push-button type without check valves for filling and releasing air; the inner cavity is vented with air or oxygen as needed, and an external temperature controller is included. A fan is activated to assist cooling during high temperatures. The cavity provides heat insulation and cooling of 30% or more, preventing icing and condensation at low temperatures. The membrane's translucency ensures plant photosynthesis, and the membrane can be depressurized and rolled up for reuse at the end of the cycle.

[0033] Under the same outdoor day-night temperature difference of 22℃, the internal temperature difference of ordinary air-filled greenhouse film is 14℃, while the internal temperature difference of the three-layer double nitrogen gas sandwich film of this invention is only 8.8℃. The heat insulation and cooling index meets the standard, and the crop emergence rate is increased by 20%.

[0034] Example 2: Live livestock and poultry farming scenario A single-layer, single-cavity / triple-layer double-nitrogen interlayer membrane is laid flat on the top and side walls of the steel-framed shed, without a sealed cavity structure. The shed is equipped with a ventilation system. The membrane body is prefabricated with thickened small air chambers and extended partitions to improve the heat insulation capacity against day and night temperature differences. The side walls and top interlayer are filled with nitrogen, while the bottom area is not filled with nitrogen. The air nozzles are basketball-type air needle nozzles with check valves for long-term air retention. An external temperature control detector is provided, and fans are activated to assist in cooling when the temperature is high, reducing the temperature difference in the enclosure and preventing low-temperature stress in the cubs.

[0035] The temperature difference between day and night inside the shed is reduced by 32% compared to ordinary inflatable sheds, the incidence of low temperature stress in cubs is significantly reduced, and the annual power consumption of temperature control equipment is reduced by 28%.

[0036] Example 3: Live aquaculture scenario The fishpond is only covered with a nitrogen-filled interlayer membrane on the side walls and top, without completely sealing it. The water is continuously oxygenated, and the space above is ventilated. It uses prefabricated small air chambers of standard thickness and short partitions. The side walls and top are filled with nitrogen, while the bottom layer is not. The chambers are isolated from each other. The air nozzles are push-button type without check valves. Only oxygen is introduced into the inner water chamber. An external temperature controller is installed; fans are activated to cool the water when it gets hot. The interlayer insulation reduces the temperature by 30% or more, and there is no icing or condensation at the pond edges.

[0037] During the high-temperature period in summer, the fluctuation range of fishpond water temperature decreased by 31%, and the survival rate of aquatic products increased by 8%.

[0038] Example 4: Post-harvest constant temperature preservation of agricultural products Employing a single-layer, single-cavity membrane within a single cavity, with prefabricated thin, small air chambers and short septa, it is suitable for storing harvested fruits and vegetables, flowers, slaughtered livestock and poultry, and aquatic products. For small, short-distance transport, zipper sealing is used; for long-term, large-volume storage, hot-melt adhesive sealing is used. The outer interlayer is filled with nitrogen for constant temperature insulation, while the inner storage cavity is first vacuumed and then filled with nitrogen for low-oxygen, corrosion-preventing properties. The air nozzles are push-button type without check valves; at the end of the preservation period, the pressure can be released, the membrane can be rolled up, and reused. No large cold storage is needed; it allows for long-term on-site preservation in the field, reducing spoilage and loss of fresh produce.

[0039] Under the same 7-day storage period, the spoilage rate of ordinary film-coated fresh produce is 21%, while the spoilage rate of this solution is only 6%, eliminating the need for continuous refrigeration in cold storage and reducing energy consumption by 55%. Multi-condition usage method

[0040] Step 1: Select the cavity structure according to the usage scenario: for planting and post-harvest preservation, select a double-layer cavity with an inner cavity; for livestock and poultry and fishery live breeding, lay a three-layer double-layer or single-layer single-cavity membrane with ventilation and oxygen supply; select any of the following for edge sealing and locking: buckle, zipper, or hot melt adhesive, and select the membrane with the corresponding prefabricated small air chamber thickness and length specifications according to the working conditions. Step 2: Connect the nitrogen generator pipeline to the gas nozzle of the target zone. First, remove the air and water vapor from the interlayer. Control the inflation pressure at 0.02–0.08 MPa, 0.02–0.04 MPa for thin membranes, and 0.05–0.08 MPa for thick membranes. Use your hand to judge the filling degree. Fill the exposed area above ground with nitrogen, and leave the bottom area close to the ground / covered with soil empty without filling with nitrogen. Step 3: Introduce the corresponding gas into the inner sealed cavity: for planting, introduce air / oxygen / nitrogen; for live fish, introduce only oxygen; for post-harvest preservation, first evacuate the vacuum and then fill with nitrogen. Step 4: Daily maintenance involves reading the internal temperature using a temperature controller on the outside of the membrane, turning on the external fan to assist in cooling when the temperature is high, manually inspecting the membrane, and replenishing nitrogen in separate zones when nitrogen is lost. Step 5: After using the snap-on or zipper type membrane, press the air nozzle to purge the nitrogen from the interlayer, unseal the edges, roll it up, and store it for reuse the following year; the heat-sealed type is for single use only. Attached Figure Description

[0041] Figure 1: Schematic diagram of the overall structure of the double-layered cavity within the cavity Figure 2: Schematic diagram of the cross-sectional structure of the three-layer substrate double nitrogen sandwich structure Figure 3: Enlarged schematic diagram of the edge sealing structure and air nozzle assembly. Figure Labels

[0042] Figure 1. Schematic diagram of the overall structure of the double-layered cavity within the cavity. 1. Outer nitrogen insulation interlayer, 2. Inner sealed cavity, 3. Membrane substrate, 4. Spacer strip, 5. Edge sealing, 6. Inflation nozzle, 8. External temperature control detector.

[0043] Figure 2. Schematic diagram of the cross-sectional structure of the three-layer substrate double nitrogen sandwich layer. 1 outer nitrogen insulation interlayer, 3 membrane substrate, 4 spacers, 9 independent small air chambers.

[0044] Figure 3. Enlarged schematic diagram of the edge sealing structure and air nozzle assembly. 5. Edge sealing, 501 snap-on press-fit sealing section, 502 zipper sealing section, 503 hot melt adhesive sealing section, 6. Inflation nozzle, 601 basketball-style inflation needle nozzle, 602 press-fit inflation / deflation nozzle, 7. Check valve. Additional notes:

[0045] Figures 1, 2, and 3 show that the dimensions and arrangement density of all spacers, small air chambers, air nozzles, and sealing sections can be adjusted according to the operating conditions. All such adjusted structures fall within the scope of protection of this invention. Technical features

[0046] This invention integrates multi-specification nitrogen-insulated cavities, zoned nitrogen-filled structures, multiple types of sealing edges, dual-optional gas nozzles, supporting nitrogen generation and temperature control equipment, and standardized usage processes. It completely connects the two major industrial links of field planting and breeding, and post-harvest storage of agricultural products, forming an integrated agricultural technology system encompassing planting, breeding, and storage. This solution relies on nitrogen to construct a passive, constant-temperature, oxygen-free protective environment, eliminating the need for continuous high-power cold storage, significantly reducing energy consumption of temperature control equipment, and effectively reducing spoilage and losses during the storage and transportation of fresh agricultural products. The entire technology is adaptable to all scenarios of planting, livestock and poultry, aquaculture, and post-harvest preservation. Any routine minor adjustments or equivalent replacements to the dimensions, shape, and assembly methods of the components fall within the scope of protection of this invention.

Claims

1. A temperature-controlled protective film suitable for nitrogen-filled chambers in agriculture, animal husbandry, fisheries, and planting, characterized in that, It includes three types of cavity structures: double-layer independent cavity within the cavity, three-layer substrate with double nitrogen interlayer, and single-layer single-cavity nitrogen interlayer; all cavities have a heat insulation and cooling effect of 30% or more, and the cavity interior does not freeze or condense in low-temperature environments, thus stably protecting crop growth; The double-layer independent cavity is only suitable for live planting and cultivation and post-harvest preservation of agricultural products. The membrane is extended and sealed in one piece, and its shape can be freely shaped. It consists of an outer nitrogen insulation layer and an inner sealed cavity. The inner and outer cavities are completely isolated from each other and do not allow air to pass through. The membrane sealing edge is equipped with three sealing structures: buckle press locking, zipper sealing, and hot melt adhesive fusion sealing. The three-layer substrate double nitrogen interlayer and single-layer single-cavity nitrogen interlayer are laid flat for the top and side walls of livestock and poultry breeding sheds and fish ponds, and the breeding and aquaculture sites are equipped with ventilation and oxygen supply systems, without adopting a fully enclosed cavity structure. The interlayer has an integrated heat-sealed partition strip, which divides it into independent small air chambers. Nitrogen can be selectively filled in different areas. Nitrogen can be filled into the exposed areas above ground, while nitrogen can be omitted from the buried soil layer and the ground-level areas at the bottom of the fishpond. During the partition strip processing and forming stage, the thickness and length of the small air chambers are preset according to different working conditions. The thickness of the fresh food preservation chamber is 2-6mm, the planting chamber is 3-12mm, and the livestock and poultry breeding chamber is 10-20mm thickened. The length of the partition strip is 0.3-3m, and the forming size of each small air chamber is predetermined. The outer nitrogen jacket is equipped with a basketball-style inflation needle nozzle and a press-type inflation / deflation nozzle. Both types of nozzles can be equipped with built-in check valves as needed. It is compatible with medium and small-sized nitrogen generators and filling machines. Before inflation, the air in the jacket is evacuated. The standard inflation pressure is 0.02–0.08 MPa, 0.02–0.04 MPa for thin membranes, and 0.05–0.08 MPa for thick membranes. Manual pressure elasticity is used as an auxiliary filling verification standard. The inner sealed cavity has a separate inflation nozzle, which can be filled with air, oxygen, or nitrogen as needed. The inner cavity is equipped with an external temperature control detector, and a temperature display terminal is set on the outside of the membrane. It can be equipped with an external fan for auxiliary cooling.

2. The temperature-controlled preservation protective film for nitrogen chambers in agriculture, animal husbandry, fisheries, and planting, as described in claim 1, is characterized in that... The spacers are divided into long strips, square blocks, wavy shapes, and dotted hot-melt spacers. During processing, the thickness and length of the corresponding small air chamber are matched according to the working conditions. They can be set as completely isolated independent small air chambers or interconnected air chambers with reserved interconnection channels. A single point of damage only corresponds to the loss of nitrogen in the corresponding zone, and nitrogen can be replenished in the zone separately.

3. The temperature-controlled preservation protective film for nitrogen chambers in agriculture, animal husbandry, fisheries, and planting, as described in claim 1, is characterized in that... The basketball-style inflatable needle nozzle, when equipped with a check valve, automatically locks in air during inflation, preventing backflow and making it suitable for year-round fixed installation on sheds. The press-type inflatable / deflatable nozzle without a check valve allows for rapid pressure release, making it suitable for seasonal disassembly and storage. The inflatable needle nozzle and press-type inflatable / deflatable nozzle can be replaced with threaded sealing nozzles and quick-connect pneumatic connectors.

4. The temperature-controlled preservation protective film for nitrogen chambers in agriculture, animal husbandry, fisheries, and planting, as described in claim 1, is characterized in that... The membrane substrate is selected from any one or more of polyethylene series membranes, EVA composite membranes, PO co-extruded membranes, PVC membranes, biodegradable membranes, TPU light-transmitting soft films, and modified polypropylene woven membranes for composite co-extrusion molding. Each substrate can be used alone or in multiple layers, and can be combined with glass fiber, non-woven fabric, and foamed soft film to enhance performance.

5. The temperature-controlled preservation protective film adapted for nitrogen chambers in agriculture, animal husbandry, fisheries, and planting, as described in claim 1, is characterized in that... Under normal operating conditions, the side walls and top of the fishpond are filled with nitrogen, while the bottom layer is not filled with nitrogen. Only oxygen is introduced into the inner water cavity of the fishpond, and there is no cross-contamination between the outer nitrogen layer and the inner water cavity.

6. The temperature-controlled protective film for nitrogen-filled chambers in agriculture, animal husbandry, fisheries, and planting, as described in claim 1, is characterized in that... In post-harvest preservation of agricultural products, the internal air of the storage cavity is first removed, and then nitrogen is introduced to form a low-oxygen anti-corrosion environment, which uses the chemical inertness of nitrogen to inhibit the oxidation and spoilage of fresh produce.

7. The temperature-controlled preservation protective film for nitrogen chambers in agriculture, animal husbandry, fisheries, and planting, as described in claim 1, is characterized in that... When the membrane is partially damaged and leaks air, it is repaired by heat sealing with a membrane of the same material. After the repair is completed, the affected area is purged with nitrogen separately, without depressurizing the entire membrane.

8. The temperature-controlled preservation protective film for nitrogen chambers in agriculture, animal husbandry, fisheries, and planting, as described in claim 1, is characterized in that... High-temperature operating conditions are defined as ambient temperatures ≥32℃, and low-temperature operating conditions are defined as ambient temperatures ≤5℃.

9. A method for using the protective film according to any one of claims 1 to 8 under multiple working conditions, characterized in that, It includes the following steps: Step 1: Select the cavity structure according to the usage scenario: for planting and post-harvest preservation, select a double-layer cavity with an inner cavity; for livestock and poultry and fishery live breeding, lay a three-layer double-layer or single-layer single-cavity membrane with ventilation and oxygen supply; select any of the following for edge sealing and locking: buckle, zipper, or hot melt adhesive, and select the membrane with the corresponding prefabricated small air chamber thickness and length specifications according to the working conditions. Step 2: Connect the nitrogen generator pipeline to the gas nozzle of the target zone. First, remove the air and water vapor from the interlayer. Control the inflation pressure at 0.02–0.08 MPa, 0.02–0.04 MPa for thin membranes, and 0.05–0.08 MPa for thick membranes. Determine the inflation status by hand pressure. Inflate the exposed above-ground areas with nitrogen, while the bottom areas that are close to the ground / covered with soil can be left empty without inflation. Step 3: Introduce the corresponding gas into the inner sealed cavity: for planting, introduce air / oxygen / nitrogen; for live fish, introduce only oxygen; for post-harvest preservation, first evacuate the vacuum and then fill with nitrogen. Step 4: Daily maintenance involves reading the internal temperature using a temperature controller on the outside of the membrane, turning on the external fan to assist in cooling when the temperature is high, manually inspecting the membrane, and replenishing nitrogen in separate zones when nitrogen is lost. Step 5: After using the snap-on or zipper-type membrane, press the air nozzle to purge the nitrogen from the interlayer, unseal the edges, roll it up, and store it for reuse the following year.

10. A constant-temperature preservation system for the entire agricultural, livestock, and fishery industry chain, characterized in that, The system comprises a nitrogen chamber constant temperature preservation protective film, a small nitrogen generator and nitrogen filling machine, a medium and small nitrogen generator and nitrogen filling machine, an external temperature control detector, and an external cooling fan, as described in any one of claims 1 to 8. All components are connected by matching pipelines and are used to achieve constant temperature protection in field farming and on-site preservation of agricultural products after harvest. It is compatible with the technical solutions described in claims 1 to 9. Any routine minor adjustments or equivalent replacements to the dimensions, shape, or assembly method of the components of this system fall within the technical protection scope of this invention.

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