Film container

Abstract

The utility model relates to a thin film container which comprises an outer layer thin film which forms a bag body with the periphery and the bottom closed and only the top open, and is characterized by further comprising an inner layer thin film and a one-way valve, and the inner layer thin film and the outer layer thin film are connected in a sealing mode through at least two first sealing lines which surround the opening portion of the bag body and are spaced by a certain distance. An air column cavity is formed between the first sealing wires, the one-way valve is arranged between the inner-layer film and the outer-layer film, and the one-way valve enables air to enter the air column cavity from the outside to avoid reverse flow. By adopting a simpler process and lower cost, the mouth edge can be kept in a certain shape during use so as to be convenient for articles to enter, and other positions are kept soft and easy to deform.

Description

Technical Field

[0001] This utility model relates to the field of container technology, and in particular to a thin film container. Background Technology

[0002] Containers used for carrying things are essential items in daily life, including buckets, basins, and bags. The history of these containers can be traced back thousands of years, with the earliest forms likely being made of wood. With the development of human civilization and the advancement of technology, the design and manufacturing materials of containers have also undergone significant changes, evolving from the initial wooden structures to today's diverse materials such as plastics and metals.

[0003] Plastic containers are widely used, commonly including plastic bags and plastic buckets. Plastic bags are characterized by thin, flexible walls, and their rims generally cannot maintain a fixed shape. Plastic buckets, on the other hand, are typically characterized by thick, rigid walls, and their rims generally maintain a fixed shape. The two types have distinct usage scenarios and differ significantly in the amount of material used. However, in some scenarios, users prefer the container rim to maintain a certain shape for easy loading and unloading, while the container walls do not need to be particularly thick. On one hand, a thinner plastic film provides the necessary strength; on the other hand, the walls may need to be flexible and deformable to adapt to the usage scenario.

[0004] To address the aforementioned problems, a common solution is to use a ring or barrel of a fixed shape and then connect the opening of the film bag to the ring or barrel. Obviously, such a solution typically requires two components to be combined, resulting in high costs and complex manufacturing processes. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the technical problem to be solved by this utility model is to provide a thin film container that adopts a simpler process and lower cost, so that the rim can maintain a certain shape during use to facilitate the entry of items, while other parts remain soft and easily deformable.

[0006] To solve the above-mentioned technical problems, this utility model proposes a thin film container, including an outer film, which forms a bag body that is closed on all sides and bottom but open only at the top. The invention is characterized by further including an inner film and a one-way valve. The inner film and the outer film are sealed together by at least two first sealing lines that surround the opening of the bag body and are spaced at a certain distance. An air column cavity is formed between the first sealing lines. The one-way valve is disposed between the inner film and the outer film. The one-way valve allows gas to enter the air column cavity from the outside and avoids reverse flow.

[0007] As one construction method for the bag body, the outer film is a complete ring, or the outer film is folded in half to divide the outer film into a front film and a back film of the bag body, and the sides of the front film and the back film of the bag body are sealed to form a ring. The bottom edge of the ring-shaped outer film is sealed while the top edge is not sealed, thereby forming the bag body.

[0008] Furthermore, after the outer film is folded flat, it forms two sides. The sides are folded inward into the bag to form an inward folded area. The bottom edge of the corresponding part of the inward folded area is sealed together with the bottom edge of the outer film. When the bag is opened, the bottom area of ​​the outer film can be flattened to form the bottom surface of the bag, while the inward folded area can be flattened to form the side wall of the bag.

[0009] As a second construction method for the bag body, the outer film is folded up and down to divide the outer film into a front film and a back film. The two sides of the front film are sealed to the two sides of the back film to form the bag body. The top edges of the front film and the back film are not sealed to each other to form the bag opening. The inner film is sealed to the front film and the back film through a first sealing line.

[0010] Furthermore, the bottom edge formed by folding the outer film in half is folded into the bag body to form the bottom edge inward fold area. The side edge of the corresponding part of the bottom edge inward fold area is sealed together with the side edge of the front film and the back film of the bag body. When the bag body is opened, the bottom edge inward fold area can be flattened to form the bottom of the bag body, and the side edge area can be flattened to form the side wall of the bag body.

[0011] Preferably, the outer and inner films within the air column cavity area are provided with weakened sealing points. The weakened sealing points do not completely seal the air column cavity but reduce the ventilation width of the air column cavity. The weakened sealing points are located at the connection between the side of the bag body, the front of the bag body, and the back of the bag body.

[0012] In the second construction method of the bag body, the first option of the inner film is that the inner film is in the shape of a ring, and the two first sealing lines are close to the two sides of the inner film. The inner film and the outer film are sealed only by the first sealing lines to form a single air column cavity.

[0013] The second option for the inner film is that the inner film includes a front inner film and a rear inner film. The front inner film and the rear inner film are sealed to the front film and the rear film of the bag body respectively through the first sealing line. The side of the front inner film is sealed to the side of the front film of the bag body, and the side of the rear inner film is sealed to the side of the rear film of the bag body. At this time, the air column cavity forms two cavities on the front film and the rear film of the bag body respectively.

[0014] Preferably, the inner membrane and the outer membrane of the inner layer are also divided by folding the inner membrane in half. The inner membrane is sealed inside the outer membrane and can be folded along with the outer membrane. The inner membrane and the outer membrane are also provided with at least two second sealing lines. A venting column is formed between the second sealing lines. The two ends of the venting column are respectively connected to two cavities of the air column cavity. There is only one one-way valve and it is set on any one of the cavities.

[0015] Meanwhile, there are two ventilation columns, which are respectively set near the weakening sealing point. The ventilation column starts from one cavity of the air column cavity, extends along the wall of one bag body, passes through the bottom surface of the bag body, and then extends along the wall of another bag body to the other cavity of the air column cavity.

[0016] Preferably, there is no weakening structure at the connection between the bag wall and the bottom of the bag on the ventilation column.

[0017] In addition, the one-way valve of this utility model includes at least one valve diaphragm. The upper end and the bottom of the valve diaphragm are respectively crossed by a first sealing line. An air inlet is left at the upper end of the valve diaphragm. The bottom of the valve diaphragm is sealed with the outer film and the inner film. Two side sealing lines are also provided on the one-way valve between the two first sealing lines. The side sealing lines start from the first sealing line at the upper end of the valve diaphragm and extend downward to the first sealing line near the bottom of the valve diaphragm to form an air outlet.

[0018] In summary, this type of film container, using a simpler process and lower cost, can maintain a certain shape at the rim during use to facilitate the entry of items, while keeping other parts soft and easily deformable. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the uninflated film bag structure in Embodiment 1 of this solution;

[0020] Figure 2 This is a schematic diagram of the inflated film bag structure in Embodiment 1 of this solution.

[0021] Figure 3 This is a schematic diagram of the uninflated film bag structure in Embodiment 2 of this solution;

[0022] Figure 4 This is a schematic diagram of the inflated film bag structure in Embodiment 2 of this solution.

[0023] Figure 5 This is a schematic diagram of the bottom structure of the film bag after inflation in Embodiment 2 of this solution;

[0024] Figure 6 This is a schematic diagram of the uninflated film bag structure in Embodiment 3 of this solution;

[0025] Figure 7This is a schematic diagram of the bottom structure of the uninflated film bag in Embodiment 3 of this solution;

[0026] Figure 8 This is a schematic diagram of the inflated film bag structure in Embodiment 3 of this solution.

[0027] Figure 9 This is a schematic diagram of the bottom structure of the film bag after inflation in Embodiment 3 of this solution;

[0028] Figure 10 This is a schematic diagram of the uninflated film bag structure in Embodiment 4 of this solution;

[0029] Figure 11 This is a schematic diagram of the inflated film bag structure in Embodiment 4 of this solution.

[0030] Figure 12 This is a schematic diagram of the bottom structure of the film bag after inflation in Embodiment 4 of this solution;

[0031] Figure 13 This is a schematic diagram of the film unfolding structure and creases in Embodiment 4 of this solution;

[0032] Figure 14 This is a schematic diagram of the front structure after the side sealing is completed in Embodiment 4 of this solution.

[0033] Figure 15 This is the implementation method of this solution. Figure 13 Enlarged structural diagram of the structure labeled C;

[0034] Figure 16 This is a schematic diagram of the structure of the annular thin film roll in this embodiment of the solution;

[0035] Figure 17 This is a schematic diagram of the structure of a single-layer thin film roll in this embodiment of the solution;

[0036] Among them, the outer film-1, the side inward fold area-11, the front film of the bag-12, the rear film of the bag-13, the bottom inward fold area-14, the bag wall-15, the bottom surface of the bag-16, the inner film-2, the annular inner film-21, the front inner film-22, the rear inner film-23, the one-way valve-3, the air valve membrane-31, the air inlet-32, the side sealing line-33, the air outlet-34, the first sealing line-4, the air column cavity-5, the bag-6, the bottom edge-61, the side edge-62, the bag side wall-63, the weakened sealing point-64, the second sealing line-7, the ventilation air column-8, the annular film roll-A, and the single-layer film roll-B. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0038] Example 1

[0039] like Figure 1 as well as Figure 2 The illustrated film container includes an outer film 1, which forms a bag body 6 that is closed on all sides and bottom but open only at the top. The container is characterized by further including an inner film 2 and a one-way valve 3. The inner film 2 and the outer film 1 are sealed together by at least two first sealing lines 4 surrounding the opening of the bag body 6 and spaced at a certain distance. An air column cavity 5 is formed between the first sealing lines 4. The one-way valve 3 is disposed between the inner film 2 and the outer film 1, allowing gas to enter the air column cavity 5 from the outside while preventing reverse flow. (The following embodiments are summarized as "Basic Structure Construction Method of Film Container")

[0040] With this structure, gas enters the air column cavity 5 through the one-way valve 3 and gradually fills and locks in the air. At this time, the air column cavity 5 located at the edge of the bag body 6 bulges up and has a certain shape and resistance to deformation, which solves the problem that the film is soft and cannot maintain a certain shape, while other parts remain soft and easily deformed.

[0041] Example 2

[0042] The construction method of the basic structure of the thin film container in this embodiment is the same as that in Embodiment 1.

[0043] like Figure 3 , Figure 4 , Figure 5 As shown, in this embodiment, the outer film 1 is a complete ring, or the outer film 1 is folded in half to divide it into a front film 12 and a back film 13, and the sides 62 of the front film 12 and the back film 13 are sealed to form a ring. The bottom edge 61 of the ring-shaped outer film 1 is sealed while the top edge is not sealed, thus forming the bag 6. Further, the outer film 1 is folded flat to form two sides 62. The sides 62 are folded inward toward the bag 6 to form an inward folded area 11. The bottom edge 61 of the corresponding part of the inward folded area 11 is sealed together with the bottom edge 61 of the outer film 1. When the bag 6 is opened, the bottom area of ​​the outer film 1 can be flattened to form the bottom surface of the bag 6, and the inward folded area 11 can be flattened to form the side wall 63 of the bag.

[0044] Preferably, the outer and inner film layers 1 and the inner film layer 2 within the air column cavity 5 are provided with weakened sealing points 64. The weakened sealing points 64 do not completely seal the air column cavity 5, but reduce the ventilation width of the air column cavity 5. The weakened sealing points 64 are located at the connection points between the side of the bag body 6 and the front and rear of the bag body 6. (The following embodiments are summarized as "the setting of the weakened sealing points 64")

[0045] A complete annular film or a single-layer film can be successfully produced using existing blown film technology. In this embodiment, a complete annular film or a single-layer film is folded in half and then sealed at the side 62 to form an annular film. The purpose is to ensure that the outer film 1 has no more than one break at the opening, thus making the air column cavity 5 a complete air cavity, which is convenient for the user to inflate. The side inward folding area 11 is provided so that the bag body 6 can have a side wall structure. When the bag body 6 is unfolded, it can form a square opening with a larger opening area, making it easier for objects to enter and exit. At the same time, the sealing point 64 is weakened because the existence of the side wall structure requires the air column cavity 5 to be bent to make the shape more regular.

[0046] Example 3

[0047] The construction method of the basic structure of the thin film container in this embodiment is the same as that in Embodiment 1.

[0048] like Figure 6 , Figure 7 , Figure 8 , Figure 9 As shown, in this embodiment, the outer film 1 is folded in half vertically to form a front film 12 and a back film 13. The two sides 62 of the front film 12 are sealed to the two sides 62 of the back film 13 to form the bag body 6. The top edges of the front film 12 and the back film 13 are not sealed to each other, forming the opening of the bag body 6. The inner film 2 is sealed to the front film 12 and the back film 13 via a first sealing line 4. The bottom edge 61 formed by folding the outer film 1 in half is folded inwards towards the bag body 6 to form an inward folded area 14. The corresponding side edge 62 of the inward folded area 14 is sealed together with the side edges 62 of the front film 12 and the back film 13. When the bag body 6 is opened, the inward folded area can be flattened to form the bottom of the bag body 6, and the side edge 62 area can be flattened to form the side wall 63 of the bag body. (In the following embodiments, this is summarized as "the way the outer film 1 forms the bag body 6").

[0049] The setting of the weakened sealing point 64 is the same as in Embodiment 2.

[0050] In this embodiment, the inner membrane 2 is in the shape of an annular strip, and the two first sealing lines 4 are close to the two side edges 62 of the inner membrane 2 respectively. The annular inner membrane 21 and the outer membrane 1 are sealed together by the first sealing lines 4 to form a single air column cavity 5.

[0051] Unlike Example 2, Example 3 uses a single-layer film folded in half vertically and then sealed along the two sides 62 to form a bag body 6. For example... Figure 16 as well as Figure 17The reason is that if the film form of Embodiment 2 is used, when one end of the film of the annular film roll A is pulled out to seal the inner film 2, the previous bag body 6 needs to be cut off to form the opening of the next bag body 6 before the next bag body 6 can be processed. This results in the inability to continuously produce products, which greatly affects production efficiency. However, with the single-layer film roll form of this embodiment, since the opening of the bag body 6 faces the side after the film is folded, the bag body 6 is not formed by waiting for the previous bag body 6 to be cut off. By reasonably setting the processing sequence, the continuous processing of sealing the inner film 2 can be carried out. Moreover, the use of the annular strip inner film 2 can ensure that the air column cavity 5 is a complete air cavity, which is convenient for the user to inflate.

[0052] The bottom edge inward fold area 14 is also designed to give the bag body 6 a side wall structure, so that when the bag body 6 is unfolded, it can form a square opening with a larger opening area, making it easier for objects to enter and exit. The function of the weakened sealing point 64 is the same as in Embodiment 2 and will not be described in detail.

[0053] Example 4

[0054] The construction method of the basic structure of the thin film container, the way the outer film 1 forms the bag 6, and the setting of the weakened sealing point 64 in this embodiment are all the same as those in Embodiment 3.

[0055] like Figure 10 , Figure 11 , Figure 12 as well as Figure 14 As shown, the difference is that in this embodiment, the inner film 2 includes a front inner film 22 and a rear inner film 23. The front inner film 22 and the rear inner film 23 are respectively sealed to the front film 12 and the rear film 13 of the bag body through the first sealing line 4. The side 62 of the front inner film 22 is sealed to the side 62 of the front film 12 of the bag body, and the side 62 of the rear inner film 23 is sealed to the side 62 of the rear film 13 of the bag body. At this time, the air column cavity 5 forms two cavities on the front film 12 and the rear film 13 of the bag body.

[0056] Preferably, the inner membrane 22 and the inner membrane 23 of the inner membrane 2 are also divided by folding the inner membrane 2. The inner membrane 2 is sealed inside the outer membrane 1 and can be folded with the outer membrane 1. The inner membrane 2 and the outer membrane 1 are also provided with at least two second sealing lines 7. A ventilation column 8 is formed between the second sealing lines 7. The two ends of the ventilation column 8 are respectively connected to the two cavities of the air column cavity 5. There is only one one-way valve 3 and it is set on any one of the cavities.

[0057] At the same time, such as Figure 13As shown, there are two ventilation columns 8, which are respectively located near the weakened sealing point 64. The ventilation columns 8 start from one cavity of the air column cavity 5, extend along one bag wall 15, pass through the bottom surface 16 of the bag, and then extend along another bag wall 15 to the other cavity of the air column cavity 5. Preferably, there is no weakening structure at the connection between the bag wall 15 and the bottom surface 16 of the ventilation column 8.

[0058] Example 4 further modifies the arrangement of the inner film 2 based on Example 3. In this example, the inner film 2 and the outer film 1, which are laid flat and stacked, are directly sealed together. At this time, the air column cavity 5 forms a cavity at each end of the composite film. The two cavities are then connected by a ventilation column 8 to avoid double inflation. After that, the film is folded in half and sealed to complete the processing of the bag body 6. This structure can significantly improve the production efficiency of film containers.

[0059] However, at this point, there is a break in the air column cavity 5 in the two side wall sections of the film container. As the air column cavity 5 bulges when filled with air, the two bulging air column cavities 5 at the front and rear walls and the connection of the side walls will squeeze each other, causing the break in the middle of the side wall air column cavity 5 to bulge outward, making the opening of the bag body 6 into a boat shape, which affects the regularity of the opening.

[0060] Surprisingly, the presence of breakpoints and deformations increases the width adaptability of the film container in certain situations. For example, the film container of this embodiment can be placed in the storage compartment of a car door interior panel. Since the size of the storage compartment varies in different car models, ordinary structures are difficult to adapt. However, the breakpoints and deformations of the air column cavity 5 in this solution can ensure that the air column cavity 5 can support the inner side of the storage compartment regardless of the size of the storage compartment, ensuring the opening of the container. Furthermore, the other parts of the film container are soft and deformable, which can also adapt to different shapes of car door interior panel storage compartments.

[0061] In this embodiment, it is also emphasized that there are two ventilation columns 8 and their positions. The purpose of this arrangement is to facilitate the formation of a complete frame structure with the air column cavity 5, which can improve the standing stability of the film container. It is particularly important to note that there is no weakening structure at the connection between the bag wall surface 15 and the bottom surface 16 of the ventilation column 8. Usually, if there is an air column at the bend of the film, it needs to be weakened at the bend to make it easier to deform. However, experiments have shown that without a weakening structure, when the film container is inflated, the ventilation column part at the bottom of the bag can inflate quickly due to the smoother gas flow. Compared with a bag with a weakening structure, its unfolding effect is better and more impressive.

[0062] Example 5

[0063] The construction method of the basic structure of the thin film container in this embodiment is the same as that in Embodiment 1.

[0064] like Figure 14 As shown, in this embodiment, the one-way valve 3 includes at least one valve diaphragm 31. This embodiment uses two valve diaphragms 31. When using only one valve diaphragm 31, the valve diaphragm 31 can also achieve airlock by combining with the outer film 1 or the inner film 2. The upper end and the bottom of the valve diaphragm 31 are respectively crossed by a first sealing line 4. The upper end of the valve diaphragm 31 has an air inlet 32. The bottom of the valve diaphragm 31 is sealed with the outer film 1 and the inner film 2. At this time, the gas enters from the air inlet 32 ​​and enters the air column cavity 5 from both sides of the valve diaphragm 31. The one-way valve 3 is also provided with two side sealing lines between the two first sealing lines 4. The side sealing lines start from the first sealing line 4 at the upper end of the valve diaphragm 31 and extend downward to the first sealing line 4 near the bottom of the valve diaphragm 31 to form an air outlet 34.

[0065] The one-way valve 3 technology of this utility model can refer to the one-way valve 3 technology of air column bags. The difference is that, since this utility model uses air column for edge support, it is necessary to ensure that the width of the air column is small, because the wider the air column, the larger its size after expansion, which encroaches on the opening area. It is not easy to set up a one-way valve 3 within such a narrow air column width to achieve stable air lock. This is because conventional air column bags can have many air guiding structures to ensure air lock since the air inlet direction on the air valve membrane 31 is consistent with the air column extension direction. However, in this utility model, if the air inlet direction of the air valve membrane 31 is to be consistent with the air column extension direction, the air valve membrane 31 needs to be set at the end of the air column cavity 5, which means that the bag body 6 must be cut before subsequent processing of the bag body 6 can be carried out, which greatly affects production efficiency. Therefore, this embodiment adopts a special one-way valve 3 structure, and the air valve diaphragm 31 is still set on the air column cavity 5 instead of the end. In particular, the bottom of the air valve diaphragm 31 is sealed with the first sealing line 4, and a side sealing line is set to narrow the air outlet 34. At this time, the air outlet 34 of the air valve diaphragm 31 is easily compressed under the action of air pressure after the air column cavity 5 is filled, so as to realize narrow air column airlock.

[0066] In summary, this type of film container, using a simpler process and lower cost, can maintain a certain shape at the rim during use to facilitate the entry of items, while keeping other parts soft and easily deformable.

[0067] In summary, the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A film container comprising an outer film, the outer film forming a bag body closed on all sides and bottom and open at the top, characterized in that: It also includes an inner film and a one-way valve. The inner film and the outer film are sealed together by at least two first sealing lines that surround the opening of the bag and are spaced a certain distance apart. An air column cavity is formed between the first sealing lines. The one-way valve is located between the inner film and the outer film. The one-way valve allows gas to enter the air column cavity from the outside and prevents reverse flow.

2. The film container according to claim 1, characterized in that: The outer film is in the form of a complete ring, or the outer film is folded in half to divide the outer film into a front film and a back film of the bag body, and the sides of the front film and the back film of the bag body are sealed to form a ring. The bottom edge of the ring-shaped outer film is sealed while the top edge is not sealed, thereby forming the bag body.

3. The film container according to claim 2, characterized in that: The outer film is folded flat to form two sides. The sides are folded inward into the bag to form an inward folded area. The bottom edge of the corresponding part of the inward folded area is sealed together with the bottom edge of the outer film. When the bag is opened, the bottom area of ​​the outer film can be flattened to form the bottom surface of the bag, and the inward folded area can be flattened to form the side wall of the bag.

4. The film container according to claim 1, characterized in that: The outer film is folded in half to form a front film and a back film. The two sides of the front film are sealed to the two sides of the back film to form the bag body. The top edges of the front and back films are not sealed to each other to form the bag opening. The inner film is sealed to the front and back films through a first sealing line.

5. The film container according to claim 2, characterized in that: The bottom edge formed by folding the outer film in half is folded into the bag body and then folded to form the bottom edge inward fold area. The side edge of the corresponding part of the bottom edge inward fold area is sealed together with the side edge of the front film and the back film of the bag body. When the bag body is opened, the bottom edge inward fold area can be flattened to form the bottom of the bag body and the side area can be flattened to form the side wall of the bag body.

6. The film container according to claim 3 or 5, characterized in that: The outer and inner films within the air column cavity area are provided with weakened sealing points. The weakened sealing points do not completely seal the air column cavity but reduce the ventilation width of the air column cavity. The weakened sealing points are located at the connection points between the side of the bag body, the front of the bag body, and the back of the bag body.

7. The film container according to claim 6, characterized in that: The inner membrane is in the shape of a ring, and the two first sealing lines are close to the two sides of the inner membrane. The inner membrane and the outer membrane are sealed together by the first sealing lines to form a single air column cavity.

8. The film container according to claim 6, characterized in that: The inner film includes a front inner film and a rear inner film. The front inner film and the rear inner film are respectively sealed to the front film and the rear film of the bag body through a first sealing line. The side of the front inner film is sealed to the side of the front film of the bag body, and the side of the rear inner film is sealed to the side of the rear film of the bag body. At this time, the air column cavity forms two cavities on the front film and the rear film of the bag body.

9. The film container according to claim 8, characterized in that: The inner membrane and the outer membrane of the inner layer are also formed by folding the inner membrane. The inner membrane is sealed inside the outer membrane and can be folded with the outer membrane. The inner membrane and the outer membrane are also provided with at least two second sealing lines. A venting column is formed between the second sealing lines. The two ends of the venting column are respectively connected to two cavities of the air column cavity. There is only one one-way valve and it is set on any one of the cavities.

10. The film container according to claim 9, characterized in that: There are two ventilation columns, which are respectively located near the weakened sealing point. The ventilation column starts from one cavity of the air column cavity, extends along the wall of one bag body, passes through the bottom surface of the bag body, and then extends along the wall of another bag body to the other cavity of the air column cavity.

11. The film container according to claim 9, characterized in that: No weakening structure is provided at the connection between the upper wall of the ventilated air column and the bottom of the bag.

12. The film container according to claim 1, characterized in that: The one-way valve includes at least one valve diaphragm. The upper end and the bottom of the valve diaphragm are respectively crossed by a first sealing line. The upper end of the valve diaphragm has an air inlet. The bottom of the valve diaphragm is sealed to the outer film and the inner film. The one-way valve is also provided with two side sealing lines between the two first sealing lines. The side sealing lines extend downward from the first sealing line located at the upper end of the valve diaphragm to the first sealing line near the bottom of the valve diaphragm to form an air outlet.

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