Large three-dimensional flexible film cover for storage environment and manufacturing method of large three-dimensional flexible film cover

Abstract

The invention discloses a manufacturing method of a large three-dimensional flexible film cover for a storage environment, which comprises the following steps that a square prefabricated film is prepared by using a flexible film material, and the size of the square prefabricated film is determined by the size of the three-dimensional flexible film cover; the square prefabricated film is folded to form a double-layer laminated sheet, the edge where a fold line is located is a first edge, the edge perpendicular to the first edge is a second edge, and the second edge is connected in a sealed mode; two vertex angles at the two ends of the first edge are cut off, the edges, perpendicular to the first edge, of the vertex angles are third edges, and the edges parallel to the first edge are fourth edges; the double-layer laminated sheet is opened, in the opening process, the third edge and the fourth edge are attached together and connected in a sealed mode, the three-dimensional flexible film cover with the top cover and the enclosure is obtained, and an opening defined by the enclosure is formed in the lower portion of the three-dimensional flexible film cover. By means of the method, the large three-dimensional flexible film cover can be efficiently manufactured, and the method has practicability, economical efficiency and convenience and is suitable for being used and popularized in the storage environment.

Description

Technical Field

[0001] This application relates to the field of packaging, and more particularly to a method for manufacturing a large three-dimensional flexible membrane cover for warehousing environments, the three-dimensional flexible membrane cover, and a method for sealing stored goods. Background Technology

[0002] When storing goods that require airtight preservation in warehouses, various airtight enclosure structures can be used to preserve the goods, depending on the type of goods, airtightness requirements, and storage duration. For example, items with long preservation periods and high requirements for environmental airtightness and stability (such as cultural relics and traditional Chinese medicine) can be stored in rigid storage boxes with good sealing performance. For goods that are temporarily stored in the warehouse for a short period of time and have less stringent airtightness requirements (such as books, fruits, vegetables, and flowers), flexible membrane covers can be used to completely cover and seal the goods.

[0003] When using 3D protective shields to protect goods, the common practice is to cut flexible membrane materials according to design drawings, a process that usually relies on specialized cutting tools. Next, multiple layers of flexible membrane materials are bonded together using hot-melt technology, and the parts are then assembled to form a complete 3D protective shield. However, achieving seamless connection when assembling the fixed components is often difficult, thus affecting the sealing effect. Furthermore, designing and manufacturing large 3D protective shields for bulky goods can be time-consuming. Summary of the Invention

[0004] In view of this, embodiments of this application provide a method for manufacturing a large-scale three-dimensional flexible membrane cover for a warehousing environment to solve at least one technical problem. The three-dimensional flexible membrane cover manufactured using the method of this application has a top cover and a surrounding enclosure around the top cover. The volume of the three-dimensional flexible membrane cover is larger than the volume of the goods to be sealed and stored. The method includes the following steps: Step 100: Prepare a square pre-fabricated membrane using flexible membrane material. The size of the square pre-fabricated membrane is determined by the size of the three-dimensional flexible membrane cover, wherein the length of the square pre-fabricated membrane is determined by the length and height of the three-dimensional flexible membrane cover, and the width of the square pre-fabricated membrane is determined by the length and width of the three-dimensional flexible membrane cover; Step 200: Fold the square pre-fabricated membrane in half to form a double-layered sheet, with the fold line denoted as the first layer. On one side, the side perpendicular to the first side is the second side; Step 300: Cut off the two apex corners at both ends of the first side to form two identical and symmetrical overlapping notches; in the two overlapping notches, the side perpendicular to the first side is the third side, and the side parallel to the first side is the fourth side; Step 400: Open the double-layer overlapping sheet, and during the opening process, attach the third and fourth sides of the two overlapping notches together, then seal and connect them, so that the enclosure continuously surrounds the top cover to obtain a three-dimensional flexible membrane cover with a top cover and enclosure, and the bottom of the three-dimensional flexible membrane cover is the opening formed by the enclosure.

[0005] Optionally, according to the method of this application embodiment, the notched corner of the stacked pieces is a square notched corner, in step 400, the lengths of the third side and the fourth side that are attached together are equal, and the second side is sealed and connected together before step 400.

[0006] Optionally, according to the method of this application embodiment, L≥2×H+L1; W≥W1+L1; where L is the length of the square prefabricated membrane, W is the width of the square prefabricated membrane, H is the height of the three-dimensional flexible membrane cover, L1 is the length of the three-dimensional flexible membrane cover, and W1 is the width of the three-dimensional flexible membrane cover; when the three-dimensional flexible membrane cover is opened into a two-dimensional planar state, the wide side of the three-dimensional flexible membrane cover is parallel to the wide side of the square prefabricated membrane, and the long side of the three-dimensional flexible membrane cover is parallel to the long side of the square prefabricated membrane.

[0007] Optionally, according to the method of this application embodiment, L3 is greater than L4. In step 400, after sealing and connecting the overlapping part of L3 and L4, a piece of pre-made membrane is cut out and sealed and connected between the two spaced-apart parts of M, so that the enclosure continuously surrounds the top cover. Wherein, a≥2×(L3-L4); b≥M; L3 is the third side, L4 is the fourth side, M is the second side, a is the side of the pre-made membrane sealed and connected with L3, and b is the side of the pre-made membrane sealed and connected with M.

[0008] This application also proposes a large-scale three-dimensional flexible membrane cover for warehousing environments, which is manufactured based on the manufacturing method of the large-scale three-dimensional flexible membrane cover for warehousing environments described in any of the above claims.

[0009] Optionally, according to the method of this application embodiment, the flexible membrane material includes at least a co-extruded membrane.

[0010] Optionally, according to the method of the embodiments of this application, the length, width and height of the three-dimensional flexible membrane cover are all not less than 5 meters.

[0011] This application also proposes a method for sealing stored goods based on a three-dimensional flexible membrane cover. The method is based on the three-dimensional flexible membrane cover described in any of the above claims. When using the three-dimensional flexible membrane cover to seal stored goods, the three-dimensional flexible membrane cover is first placed on the stored goods. The top cover of the three-dimensional flexible membrane cover is located above the goods, and the enclosure hangs down and surrounds the goods. The edges of the enclosure are pressed and sealed with pressure strips and installed on the support surface that supports the goods, so that a sealed space is formed inside the three-dimensional flexible membrane cover to form a sealed storage for the internal goods.

[0012] Optionally, according to the method of the embodiments of this application, the method further includes: using a pressure control device to reduce the internal pressure of the three-dimensional flexible membrane cover to a preset range, and periodically performing airtightness tests on the internal pressure of the three-dimensional flexible membrane cover.

[0013] Optionally, according to the method of the embodiments of this application, the three-dimensional flexible membrane cover is tested using a negative pressure method, and the internal pressure is preset to a test range of -300Pa to -150Pa.

[0014] The embodiments of this application reduce the complex operational process of manufacturing large three-dimensional membrane covers by using prefabricated square membranes and simple folding, cutting, and sealing steps. The design of the square prefabricated membrane allows operators to quickly understand and operate it without special skills or long-term training. It eliminates the need for complex heat-sealing, welding, or inflation equipment, reducing equipment preparation and debugging time. By folding and sealing, the required three-dimensional structure can be quickly formed, greatly shortening the production time. The prefabricated membrane can be mass-produced according to demand, improving the efficiency of batch production. Through precise calculation and cutting, material waste is reduced, as are unnecessary processing steps, making it suitable for widespread application in warehousing environments. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings of the embodiments of this application will be briefly described below.

[0016] Figure 1 This is a flowchart illustrating the method of an embodiment of this application.

[0017] Figure 2 This is a schematic diagram of the overall three-dimensional flexible membrane cover according to an embodiment of this application.

[0018] Figure 3 This is a schematic diagram of the process for preparing a three-dimensional flexible membrane cover according to an embodiment of this application.

[0019] Figure 4 This is a schematic diagram of the process for preparing a three-dimensional flexible membrane cover according to another embodiment of this application.

[0020] Figure label:

[0021] 10. Three-dimensional flexible membrane cover; 11. Top cover; 12. Enclosure; 20. Square prefabricated membrane; 21. First side; 22. Second side; 23. Third side; 24. Fourth side; 28. Double-layer laminated sheet; 30. Filler prefabricated membrane. Detailed Implementation

[0022] The principles and spirit of this application will be described below with reference to several exemplary embodiments. It should be understood that these embodiments are provided to make the principles and spirit of this application clearer and more thorough, enabling those skilled in the art to better understand and implement the principles and spirit of this application. The exemplary embodiments provided herein are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments described herein without inventive effort are within the scope of protection of this application.

[0023] like Figures 1-3 As shown, the method includes the following steps:

[0024] Step 100: Prepare a square pre-film 20 using a flexible membrane material, wherein the size of the square pre-film 20 is determined by... Figure 2 The dimensions of the three-dimensional flexible membrane cover 10 shown are determined. The three-dimensional flexible membrane cover manufactured using the method of this application has a top cover 11 and a surrounding enclosure 12 around the top cover 11. The volume of the three-dimensional flexible membrane cover 10 is larger than the volume of the goods to be sealed and stored. The length of the square prefabricated membrane 20 is determined by the length and height of the three-dimensional flexible membrane cover 10, and the width of the square prefabricated membrane 20 is determined by the length and width of the three-dimensional flexible membrane cover.

[0025] Step 200: Fold the square pre-made film 20 in half to form a double-layered sheet 28. The side where the fold line is located is called the first side 21, and the side perpendicular to the first side 21 is called the second side 22.

[0026] Step 300: Cut off the two apex corners at both ends of the first side 21 to form two identical and symmetrical overlapping notches (not shown in the figure); in the two overlapping notches, the side perpendicular to the first side 21 is the third side 23, and the side parallel to the first side 21 is the fourth side 24.

[0027] Step 400: Open the double-layered sheet. During the opening process, attach the third side 23 and the fourth side 24 of the missing corner of the two sheets together, and then seal them together to obtain a three-dimensional flexible membrane cover 10 with a top cover 11 and a barrier 12. The bottom of the three-dimensional flexible membrane cover 10 is an opening formed by the barrier (not shown in the figure).

[0028] The embodiments of this application reduce the complex operational process of manufacturing large three-dimensional membrane covers by using prefabricated square membranes and simple folding, cutting, and sealing steps. The design of the square prefabricated membrane allows operators to quickly understand and operate it without special skills or long-term training. It eliminates the need for complex heat-sealing, welding, or inflation equipment, reducing equipment preparation and debugging time. By folding and sealing, the required three-dimensional structure can be quickly formed, greatly shortening the production time. The prefabricated membrane can be mass-produced according to demand, improving the efficiency of mass production. Through precise calculation and cutting, material waste is reduced, as are unnecessary processing steps.

[0029] like Figures 1-4 As shown, according to the method of this application embodiment, optionally, both stacked sheets have square notches. Since the notches are square, the lengths of the third side 23 and the fourth side 24 that are bonded together in step 400 are equal, completely overlapping and bonded together. Furthermore, before bonding and sealing the third side 23 and the fourth side 24 together, the second side 22 needs to be sealed together first. Sealing the second side 22 together first ensures that the double-layered sheet 28 will not easily separate during the opening process, but can be opened as a whole. Therefore, the third side 23 quickly aligns with and contacts the fourth side 24, saving time in step 400 and improving the efficiency of manufacturing the three-dimensional flexible membrane cover 10.

[0030] like Figures 1-4As shown, according to the method of this application embodiment, optionally, in some embodiments, the length is determined by the length and height of the three-dimensional flexible membrane cover 10, and the width of the square prefabricated membrane 20 is determined by the length and width of the three-dimensional flexible membrane cover, specifically, L≥2×H+L1; W≥W1+L1. Wherein, L is the length AA' of the square prefabricated membrane 20, W is the width AD of the square prefabricated membrane 20, H is the height AE of the three-dimensional flexible membrane cover 10, L1 is the length FG of the three-dimensional flexible membrane cover 10, and W1 is the width of the three-dimensional flexible membrane cover 10. The length of the square prefabricated membrane 20 is greater than twice the height of the three-dimensional flexible membrane cover 10 plus its length, wherein the long side of the three-dimensional flexible membrane cover 10 is parallel to the long side of the square prefabricated membrane 20. The width of the square prefabricated membrane 20 is greater than the sum of the width and length of the three-dimensional flexible membrane cover 10.

[0031] Among them, such as Figure 3 As shown, when the three-dimensional flexible membrane cover is opened into a two-dimensional planar state, the wide side FG of the three-dimensional flexible membrane cover is parallel to the wide side of the square prefabricated membrane, and the long side of the three-dimensional flexible membrane cover is parallel to the long side of the square prefabricated membrane.

[0032] When preparing a three-dimensional flexible membrane cover by cutting a square prefabricated membrane, the method according to the embodiments of this application can cut a square prefabricated membrane of appropriate size according to the size of the three-dimensional flexible membrane cover to be prepared, which can effectively avoid material waste and save material budget. After cutting and splicing, the square prefabricated membrane can be used to obtain a three-dimensional flexible membrane cover of the required size and shape.

[0033] like Figure 4 As shown, optionally, according to the method of this application embodiment, the third side 23 is larger than the fourth side 24. In step 400, after sealing and connecting the overlapping part of L3 and L4, a piece of pre-made filling membrane 30 is cut and sealed and connected to the spaced-apart parts between the two second sides 22, so that the enclosure continuously surrounds the top cover. Wherein, a≥2×(L3-L4); b≥M; a is the side sealed and connected to L3; b is the side sealed and connected to M. When the third side 23 is smaller than the fourth side 24, there will be an overlapping part between the two second sides 22. In some embodiments, the two second sides 22 can be sealed and connected together and then the overlapping part can be stacked for use. In some embodiments, one layer of the overlapping part is removed first, and then the two sides are sealed and connected together. Regardless of the use, a continuous enclosure surrounding the top cover is formed, forming a three-dimensional flexible membrane cover with a top cover and enclosure. The bottom of the three-dimensional flexible membrane cover is the opening formed by the enclosure. Except for the bottom opening, the flexible membrane cover does not have any other openings.

[0034] Optionally, according to the method of this application embodiment, the square prefabricated membrane 20 is made by splicing or cutting, and the spliced ​​parts are all sealed and connected.

[0035] This application also proposes a large-scale three-dimensional flexible membrane cover 10 for warehousing environments, which is manufactured based on the manufacturing method of the large-scale three-dimensional flexible membrane cover for warehousing environments described in any of the above claims.

[0036] The three-dimensional flexible membrane cover 10 proposed in this application has an opening at the bottom end, and is used to cover objects that need to be sealed and stored.

[0037] Optionally, according to the method of this application embodiment, the flexible membrane material includes at least a co-extruded membrane.

[0038] Co-extruded film is a multi-layered film produced by co-extruding multiple plastic materials in a single process. This type of film is widely used in the packaging industry, especially in food and pharmaceutical packaging. The main advantages of co-extruded film include:

[0039] 1. Multifunctionality: By combining layers with different functions, co-extruded films can simultaneously possess multiple properties such as barrier properties, mechanical strength, encapsulation performance, and printability. For example, one layer may have excellent oxygen barrier properties, while another layer provides moisture protection or UV resistance.

[0040] 2. Cost-effectiveness: Co-extruded films can use multiple inexpensive materials in a single production process, thereby reducing costs and optimizing performance, rather than relying on a single high-performance but more expensive material.

[0041] 3. Customization: The layers of co-extruded film can be designed as needed to meet specific packaging requirements, such as adding specific layers to improve sealing performance or adapting to specific packaging machinery.

[0042] 4. Environmentally Friendly: Co-extruded films can be designed to be easier to recycle because they can use a variety of compatible plastics, thus simplifying the recycling process. Furthermore, co-extrusion technology can reduce the amount of material used, lowering the overall environmental impact.

[0043] 5. Production efficiency: Co-extrusion technology allows composite materials to be produced in a single production step, improving production efficiency and reducing space requirements on the production line.

[0044] Therefore, three-dimensional flexible film covers made using co-extruded films are environmentally friendly, inexpensive, and have good barrier properties, especially excellent oxygen barrier and moisture-proof properties, making them very suitable for protecting objects that need to be stored with oxygen barrier and moisture protection.

[0045] Optionally, according to the method of this application embodiment, the length, width, and height of the three-dimensional flexible membrane cover 10 are all not less than 5m. The three-dimensional flexible membrane cover of this application is a large cover, mostly used for storing bulk goods.

[0046] This application also proposes a method for sealing stored goods based on a three-dimensional flexible membrane cover. The method is based on the three-dimensional flexible membrane cover 10 described in any of the above claims. When using the three-dimensional flexible membrane cover 10 to seal stored goods, the three-dimensional flexible membrane cover 10 is first placed on the stored goods. The top cover 11 of the three-dimensional flexible membrane cover 10 is located above the goods, and the enclosure 12 hangs down and surrounds the goods. The edges of the enclosure 12 are pressed and sealed with pressure strips and installed on the support surface that supports the goods, so that a sealed space is formed inside the three-dimensional flexible membrane cover 10 to form a sealed storage for the internal goods.

[0047] Air tightness testing is crucial for confirming the effectiveness of flexible membrane enclosures in sealing goods against environmental conditions. First, it ensures the sealed space containing the goods is unaffected by external air quality, especially for goods susceptible to moisture, dust, or other environmental factors. Second, regular air tightness checks allow for the timely detection of potential leaks, preventing airborne contaminants from seeping in and protecting the goods. Third, periodic air tightness testing monitors the durability and reliability of the membrane material during use, enabling timely replacement or repair of problematic components.

[0048] In some embodiments, a pressure control device is used to reduce the internal pressure of the three-dimensional flexible membrane cover to a preset range, and the internal pressure of the three-dimensional flexible membrane cover is periodically tested for airtightness. Optionally, according to the method of the embodiments of this application, the three-dimensional flexible membrane cover is tested using a negative pressure method, and the preset test range of internal pressure is -300Pa to -150Pa.

[0049] Under this pressure, a slight negative pressure environment is created inside the flexible membrane enclosure. This helps ensure that external air and particles do not enter the enclosure, thus protecting the cargo from outside air contamination. Certain goods may require storage in a slightly negative pressure environment to maintain their quality, such as certain chemicals or biological products, like tobacco products. Maintaining a certain level of negative pressure helps control the humidity and temperature of the internal environment, which is especially important for goods requiring strict environmental control.

[0050] Optionally, according to the method of this application embodiment, the flexible membrane material includes at least a co-extruded membrane.

[0051] Co-extruded films are materials with excellent sealing properties. For goods requiring modified atmosphere packaging (MAP), such as items requiring long-term, low-oxygen storage, airtightness is crucial, especially for flexible membrane covers used in tobacco storage for pest control. Tobacco is highly susceptible to pests and diseases during planting, storage, and processing, and these pests are difficult to control. Common tobacco pests include the tobacco beetle and the tobacco mealybug. During tobacco storage and processing, these pests reduce the yield of tobacco leaves, and their corpses, excrement, and body oils contaminate the tobacco. When finished cigarettes are damaged by pests, they develop boreholes and leak air, affecting the appearance and quality of the cigarettes and potentially causing product quality issues. To control tobacco pests, high-airtightness sealing technology is needed to create an independent, low-oxygen environment, allowing for pest control within a specific space in the tobacco stack during MAP operations.

[0052] This application conducted a comparative experiment on the oxygen permeability of three airtight materials. The co-extruded film used was a co-extruded PE film, and the other two airtight materials were a non-co-extruded ordinary PE film and a TPU film.

[0053] Sealing materials are the foundation of controlled atmosphere curing. The sealing membranes used in controlled atmosphere curing have certain requirements for oxygen content permeability, moisture permeability, tensile strength, and thickness.

[0054] The advantages of co-extruded film mainly include: high oxygen barrier properties, good moisture resistance, and excellent aroma retention; strong mechanical properties, high drop resistance, good puncture resistance, and good tear resistance; high temperature resistance (e.g., 121℃), low temperature resistance (e.g., -40℃), and oil resistance; non-toxic and odorless, meeting the hygiene standards for food and pharmaceutical packaging; good heat sealability, good flexibility, and good transparency.

[0055] Characteristics of non-co-extruded PE films: Most PE films are lightweight, chemically stable, and do not rust; they have good impact resistance; and they have good transparency and abrasion resistance; however, the air permeability of PE films decreases as the density increases.

[0056] TPU film, or thermoplastic polyurethane film, is a high-performance polymer material. It is a polyurethane intermediate obtained by reacting polyester or polyether polyol with diisocyanate, and has excellent oil resistance, water resistance, and mildew resistance. TPU has been widely used in: footwear, clothing, inflatable toys, water and underwater sports equipment, medical equipment, fitness equipment, car seat materials, umbrellas, suitcases, and handbags.

[0057] Tests and experiments have shown that PE film and TPU film have higher oxygen permeability and moisture permeability than co-extruded film, and cannot meet the requirements of controlled atmosphere curing; co-extruded film meets all the requirements, and the test data shows that the oxygen content of co-extruded film did not change under sealed conditions for one month.

[0058] The experimental data are shown in the table below:

[0059]

[0060] Therefore, for enclosure structures with high airtightness requirements, such as those used to control pests in a specific space where tobacco stacks are piled during low-oxygen controlled insect control, co-extruded films with good airtightness are preferred as the material for three-dimensional membrane covers.

[0061] The following two specific examples further illustrate the fabrication method of the large-scale three-dimensional flexible membrane cover of this application.

[0062] Example 1

[0063] like Figure 3 As shown, step ①: A square prefabricated membrane ADA'D' is cut from flexible membrane material, the dimensions of which are determined by the dimensions of the three-dimensional flexible membrane cover. The flexible membrane cover manufactured by the method of this application is as follows: Figure 3 As shown in step ④, there is a barrier around the top cover. The membrane cover in Figure ④ is placed on its side with the opening facing forward. When it is necessary to cover an object, the opening is facing downwards and placed over the object.

[0064] Specifically, in step ①, the dimension AA' of ADA'D' is greater than or equal to twice the height AE (or DH) of the three-dimensional flexible membrane cover in step ④ plus twice the length of the flexible membrane cover, i.e., AA' ≥ 2 × AE + 2 × BE. Furthermore, in step ①, the dimension AD of ADA'D' is greater than or equal to the width FG of the three-dimensional flexible membrane cover in step ④ plus twice the width EQ, i.e., AD ≥ 2 × EQ + FG.

[0065] Using the above method, the volume of the three-dimensional flexible membrane cover 10 is greater than the volume of the goods to be sealed and stored.

[0066] like Figure 3 As shown, after the square preform ADA'D' is cut out, step ② is performed: the square preform ADA'D' is folded in half to form a double-layered sheet ABCD, the side where the fold line is located is called the first side BC, the side perpendicular to the first side BC is called the second side AB, and the second side CD.

[0067] Step 3: Cut off the two vertices at both ends of the first side BC along the dotted line in the figure to form two identical and symmetrical overlapping notches. In this embodiment, two square vertices are cut off. In the two overlapping notches, the sides perpendicular to the first side BC are the third side QF and the third side OG, and the sides parallel to the first side BC are the fourth side EQ and the fourth side HO.

[0068] Step 4: First, seal and connect the upper and lower layers of the overlapping second side AE ​​together. Perform the same treatment on the overlapping second side DH. Then, open the double-layered sheet. During the opening process, attach the third and fourth sides of the missing corners of the two sheets together, that is, attach QF and EQ together, and attach OG and HO together, and then seal and connect them. This yields the three-dimensional flexible membrane cover with a top cover and enclosure as described in Step 4.

[0069] Example 2

[0070] like Figures 3-4 As shown, if the apex cut off in step ③ is a rectangular apex, and the third side QF and the third side OG are larger than the fourth side EQ and the fourth side HO, then in step ④, the overlapping second sides of the upper and lower layers cannot be sealed together first, because after the double-layered sheets are opened, the overlapping second sides will be a certain distance apart, such as... Figure 4 As shown, after the second overlapping side AE ​​is opened, the distance between the lower A'E' and the upper AE is shown in the shaded area. The same applies to the back side, where the distance between the lower D'H' and the upper DH is shown in the shaded area. This means the fence has two openings on the side, making it impossible to continuously surround the top cover.

[0071] Therefore, two pieces of precast membrane, no smaller than the shaded area, need to be cut to fill the two gaps in the fence. One side of the precast membrane should be greater than or equal to EE', that is, greater than or equal to twice the length of (QF-EQ); the other side of the precast membrane should be greater than or equal to the length of AE.

[0072] In some embodiments, the large three-dimensional membrane cover provided in this application is used to provide a low-oxygen insecticidal space for tobacco preservation. During long-term preservation and storage, tobacco leaves commonly face problems such as insect infestation, mold growth, oil seepage, dryness and breakage, and quality decline. In the past, the tobacco industry often used chemical fumigation for pest control, but this method is prone to residues, and pests easily develop resistance, failing to meet the requirements of green pest control in tobacco. Low-oxygen controlled atmosphere (CA) insecticidal method is a safe and green physical method. By creating a low-oxygen environment within the tobacco stack, it accelerates the respiration of pests, causing them to dehydrate and suffocate, while also inhibiting mold growth; the lower the oxygen content within the stack, the faster the insecticidal speed. This technology is environmentally friendly and non-toxic, and can replace chemical fumigation; compared with low-temperature freezing insecticidal methods, it is more efficient and saves more than 70% in costs; compared with early passive CA methods, it can improve efficiency, save labor, and achieve simultaneous regulation of oxygen content and humidity during tobacco storage, improving the quality of tobacco insecticidal preservation and achieving the goals of insecticidal and mold-preventing effects.

[0073] Assuming the actual dimensions of the tobacco stack are 6m long, 4.5m wide, and 4.25m high, then to fabricate a large three-dimensional membrane cover suitable for this stack, the required square prefabricated membrane sheet size can be 10.5×15m. Following the method of this application, after cutting and heat-sealing the seams, a highly airtight bottomless membrane cover can be obtained.

[0074] Assuming the actual dimensions of the tobacco stack are 14m long, 4.5m wide, and 3.5m high, the membrane sheet for making the stack cover should be 10.5m x 15m. After being made and cut according to the method of this application, the membrane cover has the following on both sides: Figure 4 The shaded area represents the remaining space. This remaining space requires additional fabric pieces of the corresponding size. In this example, two pieces need to be cut, each with a length greater than or equal to 3.5m and a width greater than or equal to 2m.

[0075] Assuming the actual tobacco stack is 6m long, 2.5m wide, and 4.5m high, the membrane sheet for making the stack cover can be 10.5×15m. After cutting according to the method of this application, a three-dimensional membrane cover with overlapping sides is obtained. Since 10.5-6-2.5=2m, in this example, the overlapping part is a 1×4.5m overlapping sheet. The overlapping part can be cut and the seam can be heat-sealed.

[0076] The embodiments of this application, based on existing multi-piece separate heat sealing methods, further explore a convenient method for heat sealing a single-piece flexible membrane cover. This method can significantly shorten the time required to manufacture large three-dimensional membrane covers and improve the airtightness of the flexible membrane cover.

[0077] The embodiments of this application reduce the complex operational process of manufacturing large three-dimensional membrane covers by using prefabricated square membranes and simple folding, cutting, and sealing steps. The design of the square prefabricated membrane allows operators to quickly understand and operate it without special skills or long-term training. It eliminates the need for complex heat-sealing, welding, or inflation equipment, reducing equipment preparation and debugging time. By folding and sealing, the required three-dimensional structure can be quickly formed, greatly shortening the production time. The prefabricated membrane can be mass-produced according to demand, improving the efficiency of mass production. Through precise calculation and cutting, material waste is reduced, as are unnecessary processing steps.

[0078] It should be noted that this application is not limited to the specific configurations and processes described above or shown in the figures. The above descriptions are merely specific embodiments of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the described systems, devices, modules, or units can be referred to the corresponding processes in the method embodiments, and need not be repeated here. It should be understood that the scope of protection of this application is not limited thereto. Any person skilled in the art can conceive of various equivalent modifications or substitutions within the scope of the technology disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application.

Claims

1. A method for manufacturing a large-scale three-dimensional flexible membrane cover for warehousing environments, characterized in that, The completed three-dimensional flexible membrane cover has a top cover and a continuous enclosure surrounding the top cover. The volume of the three-dimensional flexible membrane cover is larger than the volume of the goods to be sealed and stored. The method includes the following steps: Step 100: Prepare a square preform using a flexible membrane material, wherein the size of the square preform is determined by the size of the three-dimensional flexible membrane cover; wherein the length of the square preform is determined by the length and height of the three-dimensional flexible membrane cover, and the width of the square preform is determined by the length and width of the three-dimensional flexible membrane cover. Step 200: Fold the square prefabricated film in half to form a double-layered sheet. The side where the fold line is located is called the first side, and the side perpendicular to the first side is called the second side. Step 300: Cut off the two apex corners at both ends of the first side to form two identical and symmetrical overlapping notches; in the two overlapping notches, the side perpendicular to the first side is the third side, and the side parallel to the first side is the fourth side. Step 400: Open the double-layered sheet. During the opening process, the third and fourth sides of the missing corners of the two sheets are attached together and then sealed. The enclosure is then continuously wrapped around the top cover to obtain the three-dimensional flexible membrane cover with the top cover and enclosure. The bottom of the three-dimensional flexible membrane cover is the opening formed by the enclosure.

2. The method for manufacturing a large-scale three-dimensional flexible membrane cover for a warehousing environment according to claim 1, characterized in that, The notched corner of the stacked pieces is a square notched corner. In step 400, the lengths of the third and fourth sides that are attached together are equal, and the second side is sealed and connected together before step 400.

3. The method for manufacturing a large-scale three-dimensional flexible membrane cover for a warehousing environment according to claim 2, characterized in that, L≥2×H+L1; W≥W1+L1; Wherein, L is the length of the square prefabricated membrane, W is the width of the square prefabricated membrane, H is the height of the three-dimensional flexible membrane cover, L1 is the length of the three-dimensional flexible membrane cover, and W1 is the width of the three-dimensional flexible membrane cover; when the three-dimensional flexible membrane cover is opened into a two-dimensional planar state, the wide side of the three-dimensional flexible membrane cover is parallel to the wide side of the square prefabricated membrane, and the long side of the three-dimensional flexible membrane cover is parallel to the long side of the square prefabricated membrane.

4. The method for manufacturing a large-scale three-dimensional flexible membrane cover for a warehousing environment according to claim 1, characterized in that, L3 is greater than L4. In step 400, after sealing and connecting the overlapping portions of L3 and L4, a piece of pre-fabricated membrane is cut and used to seal and connect the spaced-apart portions between the two M's, so that the enclosure continuously surrounds the top cover. a≥2×(L3-L4); b≥M; L3 is the third side, L4 is the fourth side, M is the second side, a is the side where the pre-formed membrane is sealed and connected to L3, and b is the side where it is sealed and connected to M.

5. A large-scale three-dimensional flexible membrane cover for a storage environment, said three-dimensional flexible membrane cover being manufactured based on the manufacturing method of any one of claims 1-4 for a large-scale three-dimensional flexible membrane cover for a storage environment.

6. The large-scale three-dimensional flexible membrane cover for warehousing environments according to claim 5, characterized in that, The flexible membrane material includes at least a co-extruded membrane.

7. The large-scale three-dimensional flexible membrane cover for warehousing environments according to claim 5, characterized in that, The length, width, and height of the three-dimensional flexible membrane cover are all no less than 5 meters.

8. A method for sealing stored goods based on a three-dimensional flexible membrane cover, the method being based on the three-dimensional flexible membrane cover according to any one of claims 5-7, characterized in that, When using the three-dimensional flexible membrane cover to seal stored goods, the three-dimensional flexible membrane cover is first placed on the stored goods; wherein the top cover of the three-dimensional flexible membrane cover is located above the goods, and the enclosure hangs down and surrounds the goods; the edges of the enclosure are pressed and sealed with pressure strips and installed on the support surface that supports the goods, so that a sealed space is formed inside the three-dimensional flexible membrane cover to form a sealed storage for the internal goods.

9. The method for sealing stored goods based on a three-dimensional flexible membrane cover according to claim 8, characterized in that, The method further includes: using a pressure control device to reduce the internal pressure of the three-dimensional flexible membrane cover to a preset range, and periodically performing airtightness tests on the internal pressure of the three-dimensional flexible membrane cover.

10. The method for sealing stored goods based on a three-dimensional flexible membrane cover according to claim 8, characterized in that, The edges of the enclosure are pressed and sealed with pressure strips and installed on the support surface that supports the goods, so that a sealed space is formed inside the three-dimensional flexible membrane cover to seal the goods inside. After that, the airtightness is tested by negative pressure. The preset range of the internal pressure of the three-dimensional flexible membrane cover is -300Pa to -150Pa.

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