A novel type of leak-proof composite packaging bag

Abstract

This utility model discloses a novel leak-proof composite packaging bag, belonging to the field of packaging bag technology. It aims to solve the problems of existing composite packaging bags, such as poor sealing effect, inconvenience of repeated use due to single-use sealing, lack of dedicated venting structure leading to expansion and rupture, and insufficient cushioning and protection. The packaging bag includes an outer bag, an inner bag, a sealing component, and a venting component. The outer bag has an opening at the top, and the inner bag is placed inside the outer bag. The top of the inner bag is fixed to the inner wall of the outer bag, forming a cavity between the outer and inner walls. The top of the outer bag can be bent and aligned with a heat-pressing groove for heat sealing. The sealing strip embedded in the inner wall facilitates repeated opening and closing of the bag during use. The venting component includes a one-way valve in the inner bag and a vent box in the outer bag, which, together with the cavity, completes gas discharge and filling protection. This packaging bag can reliably seal the opening and allow for repeated opening, preventing bag expansion, improving leak-proof and cushioning performance, and is suitable for the storage and transportation of goods in the food, chemical, and pharmaceutical industries.

Description

Technical Field

[0001] This utility model belongs to the field of packaging bag technology, and in particular relates to a new type of leak-proof composite packaging bag. Background Technology

[0002] Composite packaging bags are widely used in the food, chemical, and pharmaceutical industries for the storage and transportation of various goods. These bags typically require excellent leak-proof properties to prevent moisture or leakage, while also meeting the requirements of reliable sealing and ease of use. Currently, composite packaging bags on the market still have several shortcomings in practical use: Some packaging bags have a simple sealing structure design, and the sealing effect at the bag opening is not good enough. In addition, some bags can only achieve a one-time seal. If the bag is opened, the sealing effect will fail, which will easily expose the unremoved items inside the bag to the external environment. This makes it inconvenient to take out the items multiple times, affects the storage quality, and is not practical. Furthermore, when the items stored in the packaging bag generate gas during storage, most existing packaging bags lack a dedicated venting structure. Gas accumulation inside the bag causes excessive expansion, affecting not only its appearance and stacking but also, in severe cases, rupture and leakage. While some vented packaging bags can retain gas, they struggle to simultaneously meet the requirements of both leak-proofing and cushioning. Under external pressure, the items inside are easily damaged, and the leak-proof effect is difficult to further improve. Utility Model Content

[0003] The purpose of this utility model is to provide a novel leak-proof composite packaging bag. In this utility model, the packaging bag can achieve reliable sealing and convenient opening of the bag opening through the sealing strip and the heat-pressing groove. The double-layer structure and internal cavity design can improve the leak-proof and cushioning performance of the bag. The one-way valve and the magnetic exhaust box work together to control the gas flow, which can prevent the bag from expanding and ensure safe use. The bending to form a through groove design facilitates the handling and hanging of the bag. The overall structure takes into account the needs of multiple uses and long-term storage, and solves the existing technical problems.

[0004] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: A novel leak-proof composite packaging bag, comprising: The outer bag has an opening at the top, which is closed by the two sides of the bag body being closed tightly together. A sealing assembly for sealing the bag opening; An inner bag is disposed inside the outer bag. The top end of the inner bag is fixedly connected to the inner wall of the outer bag, and the top opening of the inner bag corresponds to the bag opening. A cavity is formed between the outer wall of the inner bag and the inner wall of the outer bag, and the cavity is used to collect and store gas. The exhaust assembly includes a one-way valve and an exhaust box. The one-way valve is disposed on the inner bag, and the exhaust box is disposed on the outer bag. The one-way valve allows gas to flow unidirectionally from the inside of the inner bag into the cavity, and the exhaust box is used to exhaust the gas in the cavity.

[0005] Optionally, the sealing assembly includes two first hot-pressing grooves and two second hot-pressing grooves. The two first hot-pressing grooves are respectively opened on the two outer walls of the outer bag, and the two second hot-pressing grooves are respectively opened on the two outer walls of the outer bag. The two second hot-pressing grooves are located above the adjacent first hot-pressing grooves. The top of the outer bag near the bag opening is bent to align the two first hot-pressing grooves and the two second hot-pressing grooves and fix them by hot pressing.

[0006] Optionally, the top of the outer bag forms a through groove after being bent. The through groove is used to increase the volume of the top of the outer bag for easy handling and to allow objects to be inserted for hanging.

[0007] Optionally, sealing strips are fixedly embedded on both inner walls of the outer bag, and the two sealing strips are located below adjacent first hot-pressing grooves. The two sealing strips cooperate with each other to achieve repeated opening and sealing of the bag opening.

[0008] Optionally, grooves are provided on both sides of the outer bag, and multiple grooves are located at the same height. The multiple grooves are located between the sealing strip and the first hot-pressing groove. The grooves are used to assist in tearing the top of the outer bag.

[0009] Optionally, the one-way valve is fixed through one side of the inner bag to restrict gas from escaping only from inside the inner bag into the cavity.

[0010] Optionally, the exhaust box includes a box body, which is fixedly inserted through one side of the outer bag. An installation strip is fixedly installed on the outer wall of the box body. The installation strip is located inside the outer bag and is fixedly connected to the inner wall of the outer bag. A through hole is opened on one side of the inner wall of the box body for connecting the cavity with the outside.

[0011] Optionally, a soft rubber sheet is provided inside the box body. One end of the soft rubber sheet is fixedly connected to the inner wall of one side of the box body. The outer wall of the soft rubber sheet is in a sealing sliding fit with the inner wall of the box body. A sealing gasket is fixedly installed on one side of the soft rubber sheet. The sealing gasket is used to abut against and seal the through hole.

[0012] Optionally, a metal buckle is fixedly inserted through one side of the soft film near the movable end, and a ring magnet is fixedly installed on one side of the inner wall of the box body. The metal buckle and the ring magnet magnetically cooperate to fix the soft film. A relief groove is opened at one end of the box body near the ring magnet. A paddle is integrally formed at the movable end of the soft film. The paddle is set in the relief groove for lifting the soft film.

[0013] The embodiments of this utility model have the following beneficial effects: In this utility model, the sealing strips on the inner walls of both sides of the outer bag can achieve the initial sealing of the bag opening. Subsequently, the top of the outer bag is bent and the first and second hot-press grooves are aligned and fixed by hot pressing, which can form a firm secondary seal, ensuring the reliability of the initial seal of the bag opening and effectively preventing external moisture or impurities from entering the bag. In this utility model, when it is necessary to take out the items in the bag multiple times, the groove located between the sealing strip and the first hot-pressing groove is used as the tearing point, and the bent structure at the top of the outer bag can be easily and completely torn off. The groove provides a clear positioning for the tearing operation, avoiding damage to the effective use area of ​​the bag during the tearing process. After tearing, the sealing strip can still maintain good sealing performance, which can realize the repeated opening and sealing of the bag opening to meet the needs of multiple uses. In this utility model, the through groove formed after the top of the outer bag is bent increases the volume of the top of the outer bag, making it easier to apply force when picking up the packaging bag and improving the ease of picking up. At the same time, the through groove can be used to insert objects such as support rods, so that the packaging bag can be hung stably. It is suitable for various usage scenarios such as warehousing and display. In this invention, the inner bag is placed inside the outer bag, and the top opening of the inner bag corresponds to the bag opening. The inner bag is directly used to store items. The double-layer structure formed by the outer bag and the inner bag can significantly improve the anti-seepage performance of the packaging bag and effectively reduce the risk of leakage or moisture of the items inside the bag. The cavity between the inner bag and the outer bag can also be filled with an appropriate amount of gas to provide cushioning protection for the items inside the bag and reduce the damage caused by external pressure to the items inside the bag. In this invention, the one-way valve on one side of the inner bag only allows the gas generated inside the inner bag to flow into the cavity, preventing the gas from accumulating inside the inner bag and causing it to over-expand and rupture. When the gas in the cavity accumulates to a certain level, by pulling the lever on the soft rubber sheet inside the exhaust box, the soft rubber sheet can drive the sealing gasket away from the through hole, and the gas in the cavity can be discharged to the outside through the through hole, making the exhaust operation simple. In this invention, the metal buckle at the movable end of the soft rubber sheet magnetically engages with the annular magnet inside the box. When the soft rubber sheet is reset, it ensures that the sealing gasket stably abuts against the through hole, achieving reliable sealing of the through hole, preventing external gas or impurities from entering the cavity, and ensuring the normal use of the packaging bag.

[0014] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention; Figure 2 This is a schematic diagram of the sealing assembly structure according to an embodiment of the present invention; Figure 3 This is a cross-sectional structural diagram of an embodiment of the present invention; Figure 4 This is a schematic diagram of the bag opening in an embodiment of the present invention. Figure 5 This is a schematic diagram of the exhaust box structure according to an embodiment of the present invention.

[0017] In the diagram: 1. Outer bag; 2. Bag opening; 3. First heat-pressing groove; 4. Second heat-pressing groove; 5. Through groove; 6. Sealing strip; 7. Groove; 8. Inner bag; 9. Cavity; 10. One-way valve; 11. Exhaust box; 12. Box body; 13. Mounting clip; 14. Through hole; 15. Ring magnet; 16. Relief groove; 17. Soft rubber sheet; 18. Sealing gasket; 19. Paddle; 20. Metal buckle. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0019] In the description of this utility model, it should be understood that the terms "opening", "upper", "middle", "length", "inner", etc., which indicate orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0020] To keep the following description of the embodiments of this utility model clear and concise, detailed descriptions of known functions and known components are omitted.

[0021] In one embodiment: Please refer to Figure 1-5 As shown, this embodiment provides a packaging bag, which mainly consists of an outer bag 1, an inner bag 8, a sealing component, and a venting component.

[0022] In this embodiment, the outer bag 1 serves as the outer layer structure of the packaging bag, with an opening 2 at its top. The opening 2 is a channel for inserting and removing items. Initially, the opening 2 is partially sealed by the close-fitting of the bag body on both sides of the outer bag 1. Subsequently, a sealing assembly can be used to further achieve a tight seal, thereby improving the overall leak-proof effect.

[0023] In this embodiment, the sealing assembly includes two first hot-pressing grooves 3 and two second hot-pressing grooves 4 formed on the outer wall of the outer bag 1. The two first hot-pressing grooves 3 are located on both sides of the outer wall of the outer bag 1 and are symmetrically distributed; the two second hot-pressing grooves 4 are also located on both sides of the outer wall of the outer bag 1, and both second hot-pressing grooves 4 are above the adjacent first hot-pressing grooves 3, maintaining symmetry. When it is necessary to tightly seal the bag opening 2, the top part of the outer bag 1 near the bag opening 2 is bent to one side, so that the two first hot-pressing grooves 3 on the side of the outer bag 1 are aligned with the two second hot-pressing grooves 4. After alignment, a hot-pressing device is used to hot-press and fix the aligned first hot-pressing grooves 3 and second hot-pressing grooves 4. Through hot pressing, the material at the corresponding position of the outer bag 1 is fused, thereby achieving a tight seal of the bag opening 2 and effectively preventing leakage of the contents of the bag.

[0024] In this embodiment, sealing strips 6 are fixedly embedded on both inner walls of the outer bag 1. The two sealing strips 6 are positioned below the adjacent first hot-pressing grooves 3, and their shapes and sizes match each other to further seal the bag opening 2. After the bag opening 2 is sealed by the hot-pressing grooves, if it is necessary to open the bag opening 2 later, the part fixed by the hot press can be torn off. At this time, by squeezing the two sealing strips 6, the two sealing strips 6 are made to stick together, thereby resealing the top opening of the outer bag 1. If it is necessary to open it again, the two sealing strips 6 can be separated, thereby realizing the repeated opening and sealing of the opening.

[0025] In this embodiment, the inner bag 8 is disposed inside the outer bag 1, and the top of the inner bag 8 is fixedly connected to the inner wall of the outer bag 1. The top opening of the inner bag 8 corresponds to the opening 2 of the outer bag 1, and the opening size is adapted to the size of the opening 2, so that items placed from the opening 2 of the outer bag 1 can smoothly enter the inner bag 8. The inner bag 8 is used to directly contain items and serves as an inner layer of protection. There is a gap between the outer wall of the inner bag 8 and the inner wall of the outer bag 1, which forms a cavity 9. The main purpose of the cavity 9 is to collect and store gas. Gas generated in the inner bag 8 can enter the cavity 9 for temporary storage.

[0026] In this embodiment, the exhaust assembly includes a one-way valve 10 and an exhaust box 11, which are respectively disposed on the outer walls of the inner bag 8 and the outer bag 1, and work together to complete the exhaust of the corresponding gas. The one-way valve 10 is fixedly inserted through one side of the inner bag 8. The internal structure of the one-way valve 10 is designed to have a one-way conduction characteristic, allowing gas to be discharged from the inside of the inner bag 8 into the cavity 9 between the inner bag 8 and the outer bag 1, while preventing gas from flowing back into the inner bag 8 from the cavity 9. This ensures that the gas in the inner bag 8 can smoothly enter the cavity 9 and avoids gas accumulation in the inner bag 8.

[0027] In this embodiment, the exhaust box 11 is located on the side of the outer bag 1 away from the one-way valve 10. This position allows gas in the cavity 9 to flow from the one-way valve 10 side to the exhaust box 11 side, facilitating gas flow and storage within the cavity 9. The exhaust box 11 includes a box body 12, which is fixedly inserted through one side of the outer bag 1, such that a portion of the box body 12 is inside the outer bag 1 and another portion is outside the outer bag 1. A mounting strip 13 is fixedly installed on the outer wall of the box body 12. The mounting strip 13 is located inside the outer bag 1 and is fixedly connected to the inner wall of the outer bag 1. The mounting strip 13 can position the box body 12, preventing it from moving or loosening on the outer bag 1 and ensuring that the box body 12 is securely installed.

[0028] In this embodiment, a through hole 14 is provided on one inner wall of the box body 12. This through hole 14 allows the cavity 9 inside the outer bag 1 to communicate with the external environment, and the gas inside the cavity 9 can be discharged to the outside through the through hole 14. A soft rubber sheet 17 is provided inside the box body 12. The soft rubber sheet 17 is made of a material with certain elasticity and sealing properties, such as silicone. One end of the soft rubber sheet 17 is fixedly connected to one inner wall of the box body 12, and the outer wall of the soft rubber sheet 17 is tightly fitted to the inner wall of the box body 12 and can slide along the inner wall of the box body 12 to achieve a sealed sliding fit. A sealing gasket 18 is fixedly installed on one side of the soft rubber sheet 17. The material of the sealing gasket 18 also has good sealing performance. The sealing gasket 18 cooperates with the inner wall of the box body 12 where the through hole 14 is opened. In the natural state, the sealing gasket 18 abuts against the through hole 14 under the action of the soft rubber sheet 17, completely sealing the through hole 14 to prevent outside air from entering the cavity 9, and also to prevent the gas in the cavity 9 from leaking out on its own without operation.

[0029] In this embodiment, a metal buckle 20 is fixedly inserted through one side of the soft plastic sheet 17 near the movable end. The metal buckle 20 is made of iron and can be attracted by a magnet. A ring magnet 15 is fixedly installed on one inner wall of the box body 12. The position of the ring magnet 15 corresponds to the position of the metal buckle 20, and the metal buckle 20 can attract the ring magnet 15 to form a magnetic attraction. Through this magnetic attraction, the movable end of the soft plastic sheet 17 can be further fixed, so that the sealing gasket 18 abuts more tightly against the through hole 14, improving the sealing effect of the through hole 14.

[0030] This application can be used in the field of packaging bag technology, or in other fields applicable to this application.

[0031] In another embodiment: Reference Figure 1 , 2 5. A new type of leak-proof composite packaging bag, which is applied to the field of packaging bag technology; In this embodiment, after the top of the outer bag 1 is bent and heat-pressed, a through groove 5 is formed at the top. This through groove 5 can increase the overall volume of the top of the outer bag 1, making it easier for users to apply force when picking up the packaging bag and improving the convenience of picking it up; on the other hand, the through groove 5 can be used to insert hooks, ropes or other objects to hang the packaging bag in a designated position, meeting the needs of hanging placement and saving placement space.

[0032] In this embodiment, multiple grooves 7 are provided on both sides of the outer bag 1. All grooves 7 are at the same height and are positioned between the sealing strip 6 and the first hot-pressing groove 3. The function of the grooves 7 is to provide a force point and tearing positioning point for the fingers when it is necessary to tear off the hot-pressed fixed part at the top of the outer bag 1, thereby reducing the resistance during tearing and facilitating the quick and easy tearing operation of the top of the outer bag 1.

[0033] In this embodiment, a clearance groove 16 is provided at one end of the housing 12 near the annular magnet 15. The clearance groove 16 penetrates the side wall of the housing 12, providing space for the operating components. A lever 19 is integrally formed on the movable end of the soft rubber sheet 17. The lever 19 is made of the same material as the soft rubber sheet 17. The lever 19 is disposed in the clearance groove 16, and a part of the lever 19 extends out of the clearance groove 16 for easy access by the user. When it is necessary to expel the gas in cavity 9, the user pinches the lever 19 with their fingers and pulls it outward. The lever 19 can drive the movable end of the soft rubber sheet 17 to move outward, so that the metal buckle 20 separates from the ring magnet 15. At the same time, the sealing gasket 18 leaves the through hole 14. At this time, the gas in cavity 9 can enter the box 12 through the through hole 14 and then be discharged to the outside through the external opening of the box 12. After the gas is discharged, the soft rubber sheet 17 is closed again and the metal buckle 20 is magnetically attracted to the ring magnet 15 again. At this time, the sealing gasket 18 can abut against the through hole 14 again to seal the through hole 14.

[0034] The usage process and working principle of this utility model technical solution are as follows: In the packaging process, the sealing strips 6 on both inner walls of the outer bag 1 fit together to seal the bag opening 2. Then, the top of the outer bag 1 is bent, ensuring the two first heat-pressing grooves 3 and two second heat-pressing grooves 4 are aligned. This area is then heat-pressed to create a strong seal. The resulting groove 5 increases the top volume, facilitating the removal of the packaging bag. It also allows for the insertion of support rods or other objects for hanging the packaging bag.

[0035] When it is necessary to open the packaging bag, simply use the groove 7 located between the sealing strip 6 and the first hot-press groove 3 as the tearing point to completely tear off the bent structure at the top of the outer bag 1, which is easy to operate. After removing the bent structure, the bag opening 2 can be easily opened. At this time, the two sealing strips 6 can provide the packaging bag with the ability to be repeatedly opened and sealed, facilitating the repeated use of the items inside the bag.

[0036] The inner bag 8 is placed inside the outer bag 1, with its top opening corresponding to the bag opening 2. The inner bag 8 is used for direct storage of items. The double-layer bag design of this packaging bag can also effectively improve the bag's leak-proof performance. A cavity 9 is formed between the outer wall of the inner bag 8 and the inner wall of the outer bag 1, which can be filled with an appropriate amount of gas to improve the protective performance of the bag. Gas generated in the inner bag 8 can enter the cavity 9 through a one-way valve 10, and the one-way valve 10 ensures that gas can only flow from the inner bag 8 to the cavity 9 in one direction, to avoid the stored contents in the inner bag 8 generating gas and causing the inner bag 8 to over-expand and rupture.

[0037] Gas accumulated in cavity 9 can be discharged through exhaust box 11. The body 12 of exhaust box 11 is fixed to the outer bag 1, and a through hole 14 on one side of the body 12 connects cavity 9 to the outside. A soft rubber sheet 17 inside the body 12 is fixed at one end and movable at the other. Under normal circumstances, the sealing gasket 18 on the soft rubber sheet 17 abuts against the through hole 14 to seal it. When venting is required, the soft rubber sheet 17 is pulled up by the lever 19, causing the sealing gasket 18 to disengage from the through hole 14, allowing gas to escape from the through hole 14. The metal buckle 20 at the movable end of the soft rubber sheet 17 magnetically engages with the annular magnet 15 inside the body 12, ensuring a stable seal of the through hole 14 when the soft rubber sheet 17 is reset, thus ensuring the effective use of the bag.

[0038] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0039] It should be noted that in the description of this specification, descriptions such as "first" and "second" are only used to distinguish the features and do not have any actual order or directional meaning. This application is not limited to this.

[0040] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0041] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A novel leak-proof composite packaging bag, characterized in that, include: Outer bag (1), the top of the outer bag (1) is provided with a bag opening (2), the bag opening (2) is closed by the bag body on both sides of the outer bag (1) being closed tightly; A sealing assembly for sealing the bag opening (2); Inner bag (8), the inner bag (8) is disposed inside the outer bag (1), the top end of the inner bag (8) is fixedly connected to the inner wall of the outer bag (1), and the top opening of the inner bag (8) corresponds to the bag opening (2). A cavity (9) is formed between the outer wall of the inner bag (8) and the inner wall of the outer bag (1). The cavity (9) is used to collect and store gas. The exhaust assembly includes a one-way valve (10) and an exhaust box (11). The one-way valve (10) is disposed on the inner bag (8), and the exhaust box (11) is disposed on the outer bag (1). The one-way valve (10) allows gas to flow unidirectionally from the inside of the inner bag (8) into the cavity (9), and the exhaust box (11) is used to exhaust the gas in the cavity (9).

2. The leak-proof novel composite packaging bag according to claim 1, characterized in that, The sealing assembly includes two first hot-pressing grooves (3) and two second hot-pressing grooves (4). The two first hot-pressing grooves (3) are respectively opened on the outer walls of both sides of the outer bag (1), and the two second hot-pressing grooves (4) are respectively opened on the outer walls of both sides of the outer bag (1). The two second hot-pressing grooves (4) are located above the adjacent first hot-pressing grooves (3). The top part of the outer bag (1) near the bag opening (2) is bent so that the two first hot-pressing grooves (3) and the two second hot-pressing grooves (4) are aligned and fixed by hot pressing.

3. The leak-proof novel composite packaging bag according to claim 2, characterized in that, The top of the outer bag (1) forms a through groove (5) after being bent. The through groove (5) is used to increase the volume of the top of the outer bag (1) for easy handling and to allow objects to be inserted for hanging.

4. The leak-proof novel composite packaging bag according to claim 2, characterized in that, The inner walls on both sides of the outer bag (1) are fixedly embedded with sealing strips (6). The two sealing strips (6) are located below the adjacent first hot press grooves (3). The two sealing strips (6) cooperate with each other to realize the repeated opening and sealing of the bag opening (2).

5. The leak-proof novel composite packaging bag according to claim 4, characterized in that, The outer bag (1) has grooves (7) on both sides. Multiple grooves (7) are located at the same height and are located between the sealing strip (6) and the first hot-pressing groove (3). The grooves (7) are used to assist in tearing the top of the outer bag (1).

6. The leak-proof novel composite packaging bag according to claim 1, characterized in that, The one-way valve (10) is fixed through one side of the inner bag (8) to restrict gas from being discharged from the inner bag (8) into the cavity (9).

7. The leak-proof novel composite packaging bag according to claim 1, characterized in that, The exhaust box (11) includes a box body (12), which is fixedly inserted through one side of the outer bag (1). An installation strip (13) is fixedly installed on the outer wall of the box body (12). The installation strip (13) is located inside the outer bag (1) and is fixedly connected to the inner wall of the outer bag (1). A through hole (14) is opened on one side of the inner wall of the box body (12). The through hole (14) is used to connect the cavity (9) with the outside.

8. The leak-proof novel composite packaging bag according to claim 7, characterized in that, The box body (12) is provided with a soft rubber sheet (17) inside. One end of the soft rubber sheet (17) is fixedly connected to the inner wall of one side of the box body (12). The outer wall of the soft rubber sheet (17) is sealed and slidably fitted with the inner wall of the box body (12). A sealing gasket (18) is fixedly installed on one side of the soft rubber sheet (17). The sealing gasket (18) is used to abut against and close the through hole (14).

9. The leak-proof novel composite packaging bag according to claim 8, characterized in that, A metal buckle (20) is fixedly inserted through one side of the soft plastic sheet (17) near the movable end. A ring magnet (15) is fixedly installed on one side of the inner wall of the box body (12). The metal buckle (20) and the ring magnet (15) magnetically attract each other to fix the soft plastic sheet (17). A relief groove (16) is opened at one end of the box body (12) near the ring magnet (15). A paddle (19) is integrally formed on the movable end of the soft plastic sheet (17). The paddle (19) is set in the relief groove (16) for lifting the soft plastic sheet (17).

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