Packaging bag with one-way vent valve

Abstract

The utility model discloses a kind of packaging bags with one-way exhaust valve, comprising: single-layer bag body;One-way exhaust valve is installed on single-layer bag body, one-way exhaust valve includes valve bottom, valve cover, valve diaphragm and elastic filter pad, valve bottom and valve cover form exhaust cavity, valve bottom and valve cover are respectively provided with the first air hole and the second air hole that communicate exhaust cavity, the first air hole and the second air hole are respectively located in single-layer bag body and outside single-layer bag body;Valve diaphragm is movably arranged in exhaust cavity corresponding to the first air hole, and covers the first air hole, elastic filter pad is installed in exhaust cavity, and elastic filter pad is located at the side of valve diaphragm away from the first air hole, and is elastically pressed on valve diaphragm.Elastic filter pad can filter air outside, prevent impurities outside from entering into single-layer bag body, and after gas in single-layer bag body is exhausted, elastic filter pad will assist the air outside to drive valve diaphragm reset and seal the first air hole, so that valve diaphragm is tightly attached to the first air hole.

Description

Technical Field

[0001] This utility model relates to the field of packaging technology, and in particular to a packaging bag with a one-way exhaust valve. Background Technology

[0002] Packaging made of flexible materials is commonly used for storing products to isolate them from ambient air. Such stored products can include agricultural products, food, chemicals, etc. A common practice is to include flexible packaging with various valves to allow air trapped inside the bag or gases generated by the contents to escape. For example, Chinese Utility Model Patent Publication No. CN205298684U describes a one-way vent valve for aluminum-plastic composite bags. This structure includes a valve seat, a valve diaphragm, and a valve cover. The valve seat has an inwardly extending seat ring in its center. The valve cover is embedded into the valve seat from the rear and sealed and fixedly connected to the seat ring, forming a cavity. Vent holes are provided on both the valve cover and the seat ring, communicating with the cavity. The valve diaphragm is placed in the cavity, and one side of the diaphragm is coated with a sealing oil layer. This one-way vent valve can expel gas from the packaging bag; however, external gas can easily carry impurities and enter the packaging bag through the gap between the valve diaphragm and the inner wall of the cavity, affecting the quality of the product inside. Utility Model Content

[0003] This invention provides a packaging bag with a one-way exhaust valve, which solves the problem that while existing packaging bags can expel gas from inside the bag, external gas can easily carry impurities into the bag through the gap between the valve diaphragm and the inner wall of the cavity, affecting the quality of the product inside the bag.

[0004] To achieve the above objectives, this utility model provides a packaging bag with a one-way exhaust valve, comprising: Single-layer bag body; A one-way exhaust valve is installed on the single-layer bag body. The one-way exhaust valve includes a valve bottom, a valve cover, a valve diaphragm, and an elastic filter pad. The valve bottom and valve cover form an exhaust chamber. The valve bottom and valve cover are respectively provided with a first air hole and a second air hole communicating with the exhaust chamber. The first air hole and the second air hole are located inside and outside the single-layer bag body, respectively, for communicating with the inner cavity of the single-layer bag body and the outside of the single-layer bag body. The valve diaphragm is movably disposed in the exhaust chamber corresponding to the first air hole and covers the first air hole. The elastic filter pad is installed in the exhaust chamber and is located on the side of the valve diaphragm away from the first air hole, and is elastically pressed onto the valve diaphragm.

[0005] In one embodiment of this application, the valve bottom and valve cover are located inside and outside the single-layer bag, respectively. The valve bottom includes an inner pressure plate and a placement cylinder. The placement cylinder is connected to the side of the inner pressure plate away from the valve cover. The placement cylinder has a valve bottom plate disposed opposite to the inner pressure plate. The first air hole is disposed on the valve bottom plate. The placement cylinder has a stepped surface facing the inner pressure plate. The stepped surface divides the inner cavity of the placement cylinder into a first cavity and a second cavity communicating with the first air hole. The valve diaphragm is placed in the first cavity, and an elastic filter pad is placed in the second cavity. The valve cover includes an outer pressure plate and an insert. The outer pressure plate and the inner pressure plate are respectively pressed against the outer and inner sides of the single-layer bag and connected by a snap-fit ​​structure. The outer pressure plate has a second air hole, and the insert is inserted into the second cavity. The valve diaphragm is movably placed in the second cavity, and the elastic filter pad is clamped between the stepped surface and the insert.

[0006] In one embodiment of this application, the elastic filter pad has a main filter layer and an auxiliary filter elastic layer, wherein the main filter layer is attached to the valve diaphragm.

[0007] In one embodiment of this application, the snap-fit ​​structure includes a first snap-fit ​​post and a first snap-fit ​​hole that engage with each other; The first snap-fit ​​post and the first snap-fit ​​hole are respectively disposed on the inner pressure plate and the outer pressure plate; or, the first snap-fit ​​post and the first snap-fit ​​hole are respectively disposed on the outer pressure plate and the inner pressure plate.

[0008] In one embodiment of this application, the snap-fit ​​structure further includes an annular snap-fit ​​protrusion and an annular snap-fit ​​groove, wherein the annular snap-fit ​​protrusion is coaxially arranged with the mounting cylinder; The snap-fit ​​protrusion and the snap-fit ​​groove are respectively provided on the inner pressure plate and the outer pressure plate; or, the snap-fit ​​protrusion and the snap-fit ​​groove are respectively provided on the outer pressure plate and the inner pressure plate.

[0009] In one embodiment of this application, the snap-fit ​​structure further includes a matching second snap-fit ​​post and a second snap-fit ​​hole; The second snap-fit ​​post and the second snap-fit ​​hole are respectively located on the bottom of the snap-fit ​​protrusion and the snap-fit ​​groove; or, the second snap-fit ​​post and the second snap-fit ​​hole are respectively located on the bottom of the snap-fit ​​groove and the snap-fit ​​protrusion.

[0010] In one embodiment of this application, the single-layer bag is made of PE material.

[0011] In one embodiment of this application, the outer surface of the single-layer bag is provided with an anti-sticking protrusion structure.

[0012] In one embodiment of this application, the protrusion structure is a circular protrusion, and the upper and lower sides of the single-layer bag body have at least two protrusion arrangement areas arranged sequentially at intervals along the length or width direction of the single-layer bag body, and the protrusion arrangement areas are covered with the circular protrusions.

[0013] In one embodiment of this application, the protrusion structure is a strip protrusion, and the upper and lower sides of the single-layer bag body have at least two protrusion arrangement areas that are sequentially spaced along the length or width direction of the single-layer bag body. The protrusion arrangement areas are covered with the strip protrusions, and the strip protrusions are sequentially spaced along the length or width direction of the protrusion arrangement areas.

[0014] Compared with the prior art, this utility model has the following advantages: This invention features an elastic filter pad positioned on the side of the valve diaphragm furthest from the first air hole. This elastic filter pad presses against the valve diaphragm, filtering external air and preventing impurities from entering the single-layer bag and affecting product quality. Because of the elastic filter pad's pressure, the valve diaphragm is only pushed away from the first air hole when the air pressure inside the single-layer bag reaches a certain level. Furthermore, after the gas inside the single-layer bag is exhausted, the elastic filter pad assists the external air in resetting the valve diaphragm and sealing the first air hole, ensuring a tight seal between the valve diaphragm and the first air hole.

[0015] Other beneficial effects of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0016] Figure 1 This is a schematic front view of a packaging bag with a one-way exhaust valve, as shown in some embodiments of the present invention. Figure 1 ; Figure 2 This is a cross-sectional structural diagram showing a one-way exhaust valve installed on a single-layer bag body, as illustrated in some embodiments of this application. Figure 3 This is an exploded view of a one-way exhaust valve shown in some embodiments of this application; Figure 4 This is a three-dimensional structural diagram of the valve bottom shown in some embodiments of this application; Figure 5 This is a cross-sectional view of the valve bottom shown in some embodiments of this application; Figure 6 This is a cross-sectional view of the valve cover shown in some embodiments of this application; Figure 7 This is a schematic front view of a packaging bag with a one-way exhaust valve, as shown in some embodiments of this application. Figure 2 .

[0017] [Explanation of Labels in the Attached Image] 10. Single-layer bag body; 11. Raised structure; 20. One-way exhaust valve; 21. Exhaust chamber; 30. Valve bottom; 31. Inner pressure plate; 32. Mounting cylinder; 321. Valve bottom plate; 322. First vent; 323. First chamber; 324. Second chamber; 325. Stepped surface; 40. Valve cover; 41. Outer pressure plate; 411. Second vent; 42. Insert; 51. First snap-fit ​​post; 52. First snap-fit ​​hole; 53. Snap-fit ​​protrusion; 54. Snap-fit ​​groove; 55. Second snap-fit ​​post; 56. Second snap-fit ​​hole; 60. Valve diaphragm; 70. Elastic filter pad; 71. Main filter layer; 72. Auxiliary elastic filter layer. Detailed Implementation

[0018] To make the technical problems, solutions, and advantages of this utility model clearer, a detailed description will be provided below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0019] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element 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. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a locking connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0022] Please see Figures 1 to 7 The present invention provides a packaging bag with a one-way exhaust valve, comprising a single-layer bag body 10 and a one-way exhaust valve 20 installed on the single-layer bag body 10. The single-layer bag body 10 is used to place agricultural products, food, chemicals and other items. The one-way exhaust valve 20 is used to discharge the gas generated by the items placed in the single-layer bag body 10, preventing the single-layer bag body 10 from exploding due to excessive gas inside.

[0023] In one embodiment of this application, the single-layer bag 10 is made of plastic material. More preferably, the single-layer bag 10 is made of PE material, which has the advantages of stable chemical properties, low cost, and is also recyclable, exhibiting high environmental performance.

[0024] Furthermore, such as Figure 1 As shown, the outer surface of the single-layer bag 10 is provided with an anti-sticking protrusion structure 11. When plastic packaging bags contain high-temperature items, the bags may stick together due to the high temperature of the items, requiring considerable force to separate them. By providing the anti-sticking protrusion structure 11 on the outer surface of the single-layer bag 10, the actual contact area between the bags can be effectively reduced, significantly decreasing the adhesion strength and making the packaging bags easier to separate.

[0025] For example, such as Figure 1 As shown, the raised structure 11 consists of circular protrusions. Both the upper and lower sides of the single-layer bag 10 have at least two raised areas spaced apart along the length or width of the single-layer bag 10, and these areas are covered with circular protrusions. For example, as... Figure 7 As shown, the raised structure 11 is a strip-shaped raised structure. The upper and lower sides of the single-layer bag body 10 have at least two raised arrangement areas that are arranged sequentially and spaced apart along the length or width direction of the single-layer bag body 10. The raised arrangement areas are covered with strip-shaped raised structures, which are arranged sequentially and spaced apart along the length or width direction of the raised arrangement areas.

[0026] like Figure 2 and Figure 3As shown, the one-way exhaust valve 20 includes a valve base 30, a valve cover 40, a valve diaphragm 60, and an elastic filter pad 70. The valve base 30 and the valve cover 40 form an exhaust chamber 21. The single-layer bag body 10 has a vent hole corresponding to the exhaust chamber 21, and the vent hole communicates with the exhaust chamber 21. The valve base 30 and the valve cover 40 are respectively provided with a first vent 322 and a second vent 411 communicating with the exhaust chamber 21. The first vent 322 and the second vent 411 are located on the single-layer bag body 10. The inner and outer parts of the single-layer bag 10 are used to connect the inner cavity of the single-layer bag 10 and the outside of the single-layer bag 10, respectively. The valve diaphragm 60 is movably disposed in the exhaust chamber 21 corresponding to the first air hole 322 and covers the first air hole 322. The elastic filter pad 70 is installed in the exhaust chamber 21. The elastic filter pad 70 is located on the side of the valve diaphragm 60 away from the first air hole 322 and is elastically pressed on the valve diaphragm 60, so that the valve diaphragm 60 tightly seals the first air hole 322. When the air pressure inside the single-layer bag 10 reaches the threshold, the gas inside the single-layer bag 10 will push the valve diaphragm 60 open and be discharged from the one-way exhaust valve 20 to the outside of the one-way exhaust valve 20. After the gas inside the single-layer bag 10 is discharged, the air pressure inside the single-layer bag 10 decreases, and the external air pressure will drive the valve diaphragm 60 to move toward the first air hole 322 and re-close the first air hole 322. The elastic filter pad 70 can filter the outside air, which can prevent external impurities from entering the single-layer bag 10 and affecting the quality of the product. Because the elastic filter pad 70 is elastically pressed on the valve diaphragm 60, the elasticity of the elastic filter pad 70 means that the valve diaphragm 60 will only be pushed away from the first air hole 322 when the air pressure inside the single-layer bag 10 reaches a certain level. Moreover, after the gas inside the single-layer bag 10 is exhausted, the elastic filter pad 70 will assist the outside air in driving the valve diaphragm 60 to reset and seal the first air hole 322, so that the valve diaphragm 60 fits tightly against the first air hole 322.

[0027] The valve bottom 30 and the valve cover 40 are located inside and outside the single-layer bag 10, respectively, as shown below. Figure 4 and Figure 5 As shown, the valve base 30 includes an inner pressure plate 31 and a mounting cylinder 32. The mounting cylinder 32 is connected to the side of the inner pressure plate 31 away from the valve cover 40. The mounting cylinder 32 has a valve base plate 321 opposite to the inner pressure plate 31. A first vent 322 is provided on the valve base plate 321. Figure 5 As shown, the housing cylinder 32 has a stepped surface 325 facing the inner pressure plate 31. The stepped surface 325 divides the inner cavity of the housing cylinder 32 into a first cavity 323 and a second cavity 324 communicating with the first air hole 322. A valve diaphragm 60 is placed in the first cavity 323, and an elastic filter pad 70 is placed in the second cavity 324. Figure 6As shown, the valve cover 40 includes an outer pressure plate 41 and an insert 42. The outer pressure plate 41 and the inner pressure plate 31 are pressed on the outer and inner sides of the single-layer bag body 10, respectively, and are connected by a snap-fit ​​structure. The outer pressure plate 41 is provided with a second air hole 411. The insert 42 is connected to the side of the outer pressure plate 41 facing the inner pressure plate 31 and is inserted into the second cavity 324. The valve diaphragm 60 can be movably placed in the second cavity 324. The elastic filter pad 70 is fixed in the exhaust cavity 21 by being clamped between the stepped surface 325 and the insert 42.

[0028] In one embodiment of this application, the elastic filter pad 70 has a main filter layer 71 and an auxiliary filter elastic layer 72, with the main filter layer 71 attached to the valve diaphragm 60. The main filter layer 71 is mainly used to filter impurities, while the auxiliary filter elastic layer 72 is used to give the entire elastic filter pad 70 a larger compression space, thereby providing a larger displacement space for the generator diaphragm and facilitating the discharge of gas from the single-layer bag 10.

[0029] Optionally, the elastic filter pad 70 is made of low-cost magic felt with good filtration performance, and the main filter layer 71 and the auxiliary filter elastic layer 72 are the magic felt pile surface layer and the magic felt hook surface layer, respectively.

[0030] In one embodiment of this application, the snap-fit ​​structure includes a first snap-fit ​​post 51 and a first snap-fit ​​hole 52 that engage with each other, such as... Figure 2 As shown, the first locking pin 51 and the first locking hole 52 are respectively provided on the outer pressure plate 41 and the inner pressure plate 31. There are several first locking pins 51, which are distributed in a ring around the axis of the mounting cylinder 32. In other feasible embodiments, the first locking pins 51 and the first locking holes 52 can also be provided on the inner pressure plate 31 and the outer pressure plate 41 respectively.

[0031] Both the valve base 30 and the valve cover 40 are made of environmentally friendly plastic materials. Preferably, the valve base 30 and the valve cover 40 are made of PE material. To further increase the connection strength between the valve base 30 and the valve cover 40, in one embodiment of this application, such as... Figure 2 As shown, the snap-fit ​​structure also includes an annular snap-fit ​​protrusion 53 and an annular snap-fit ​​groove 54, with the snap-fit ​​protrusion 53 inserted into the snap-fit ​​groove 54. Figure 5 and Figure 6 As shown, the snap-fit ​​protrusion 53 and the snap-fit ​​groove 54 are respectively provided on the inner pressure plate 31 and the outer pressure plate 41, and the annular snap-fit ​​protrusion 53 is coaxially arranged with the mounting cylinder 32. In other feasible embodiments, the annular snap-fit ​​protrusion 53 and the snap-fit ​​groove 54 can also be provided on the outer pressure plate 41 and the inner pressure plate 31 respectively.

[0032] Furthermore, the snap-fit ​​structure also includes a matching second snap-fit ​​post 55 and a second snap-fit ​​hole 56, as in one embodiment of this application, such as Figure 2As shown, the second snap-fit ​​post 55 and the second snap-fit ​​hole 56 are respectively provided on the bottom of the snap-fit ​​protrusion 53 and the snap-fit ​​groove 54. There are several second snap-fit ​​posts 55, which are arranged in a ring around the central axis of the mounting cylinder 32. In some other feasible embodiments, the second snap-fit ​​post 55 and the second snap-fit ​​hole 56 can also be provided on the bottom of the snap-fit ​​groove 54 and the snap-fit ​​protrusion 53, respectively.

[0033] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A package bag having a one-way exhaust valve, characterized by, include: Single-layer bag body; A one-way exhaust valve is installed on the single-layer bag body. The one-way exhaust valve includes a valve bottom, a valve cover, a valve diaphragm, and an elastic filter pad. The valve bottom and valve cover form an exhaust chamber. The valve bottom and valve cover are respectively provided with a first air hole and a second air hole communicating with the exhaust chamber. The first air hole and the second air hole are located inside and outside the single-layer bag body, respectively, for communicating with the inner cavity of the single-layer bag body and the outside of the single-layer bag body. The valve diaphragm is movably disposed in the exhaust chamber corresponding to the first air hole and covers the first air hole. The elastic filter pad is installed in the exhaust chamber and is located on the side of the valve diaphragm away from the first air hole, and is elastically pressed onto the valve diaphragm.

2. The package bag with a one-way air vent valve according to claim 1, characterized by, The valve bottom and valve cover are located inside and outside the single-layer bag, respectively. The valve bottom includes an inner pressure plate and a mounting cylinder. The mounting cylinder is connected to the side of the inner pressure plate away from the valve cover. The mounting cylinder has a valve bottom plate opposite to the inner pressure plate. The first air hole is located on the valve bottom plate. The mounting cylinder has a stepped surface facing the inner pressure plate. The stepped surface divides the inner cavity of the mounting cylinder into a first cavity and a second cavity connected to the first air hole. The valve diaphragm is placed in the first cavity, and an elastic filter pad is placed in the second cavity. The valve cover includes an outer pressure plate and an insert. The outer pressure plate and the inner pressure plate are pressed against the outer and inner sides of the single-layer bag, respectively, and are connected by a snap-fit ​​structure. The outer pressure plate has a second air hole, and the insert is inserted into the second cavity. The valve diaphragm is movably placed in the second cavity, and the elastic filter pad is clamped between the stepped surface and the insert.

3. The package bag with a one-way air vent valve according to claim 2, characterized by, The elastic filter pad has a main filter layer and an auxiliary filter elastic layer, with the main filter layer attached to the valve diaphragm.

4. The package bag with a one-way air vent valve according to claim 2, characterized by, The snap-fit ​​structure includes a first snap-fit ​​post and a first snap-fit ​​hole that engage with each other; The first snap-fit ​​post and the first snap-fit ​​hole are respectively disposed on the inner pressure plate and the outer pressure plate; or, the first snap-fit ​​post and the first snap-fit ​​hole are respectively disposed on the outer pressure plate and the inner pressure plate.

5. The package bag with a one-way air vent valve according to claim 4, characterized by, The buckle structure also includes an annular snap-fit ​​protrusion and an annular snap-fit ​​groove, wherein the annular snap-fit ​​protrusion is coaxially arranged with the mounting cylinder; The snap-fit ​​protrusion and the snap-fit ​​groove are respectively provided on the inner pressure plate and the outer pressure plate; or, the snap-fit ​​protrusion and the snap-fit ​​groove are respectively provided on the outer pressure plate and the inner pressure plate.

6. The package bag with a one-way air vent valve according to claim 5, characterized by, The buckle structure also includes a matching second snap-fit ​​post and a second snap-fit ​​hole; The second snap-fit ​​post and the second snap-fit ​​hole are respectively located on the bottom of the snap-fit ​​protrusion and the snap-fit ​​groove; or, the second snap-fit ​​post and the second snap-fit ​​hole are respectively located on the bottom of the snap-fit ​​groove and the snap-fit ​​protrusion.

7. The package bag having a one-way air vent valve according to claim 1, characterized by, The single-layer bag is made of PE material.

8. The package bag having a one-way air vent valve according to claim 1, characterized by, The outer surface of the single-layer bag is provided with anti-sticking protrusions.

9. The package bag having a one-way air vent valve according to claim 8, characterized by, The raised structure is a circular protrusion. The upper and lower sides of the single-layer bag have at least two raised arrangement areas arranged sequentially at intervals along the length or width of the single-layer bag, and the raised arrangement areas are covered with the circular protrusions.

10. The package bag having a one-way air vent valve according to claim 8, characterized by, The convex structure is a strip-shaped convex, and the upper and lower sides of the single-layer bag body each have at least two convex arrangement areas arranged in sequence and at intervals along the length or width direction of the single-layer bag body, and the convex arrangement areas are covered with the strip-shaped convexes arranged in sequence and at intervals along the length or width direction of the convex arrangement areas.

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