Bottle cap capable of exhausting air and relieving pressure and packaging bottle

Abstract

The invention provides a bottle cap capable of exhausting and relieving pressure and a packaging bottle, and relates to the technical field of food packaging. The bottle cap comprises an upper cap, a middle cap, a lower cap and a cutter, the upper cover and the middle cover are matched to form the storage cavity, the first sealing film is arranged at the opening part of the storage cavity, the second sealing film is arranged at the opening part of the lower cover, and in the opening process, the first sealing film and the second sealing film can be synchronously cut only by rotating and moving downwards through the cutter, so that basic raw materials in the storage cavity fall into the bottle body; the lower cap comprises a lower cap body, a second inner plug ring and a second sealing film, an annular mounting cavity is formed between the outer wall of the second inner plug ring and the inner wall of the lower cap body, the second sealing film pulls the second inner plug ring to enable the annular mounting cavity to deform, and the deformed second inner plug ring and the bottle opening part form an exhaust channel for gas to flow out. And automatic exhaust and pressure relief of redundant gas in the bottle body can be realized. The packaging bottle with the bottle cap is simple in structure, safe to use and capable of achieving industrial production.

Description

Technical Field

[0001] The present invention relates to the technical field of food packaging, and more particularly, to a bottle cap and a packaging bottle capable of exhausting air and relieving pressure. Background Art

[0002] Bottle caps are very common items in daily life. The main function of existing bottle caps is to seal the drinks in the bottle and prevent deterioration. According to different functions, there are bottle caps with different shapes and different operation methods. For example, mineral water bottle caps are circular and are opened by screwing; pull-tab can lids are ring-shaped and are opened by pulling; meat can lids have no fixed shape and are opened by pulling; beer bottle caps are opened by prying.

[0003] Bottle caps are an important part of food and beverage packaging and are also the first place where consumers come into contact with products. Bottle caps have the function of maintaining the airtight performance of the contents, and also have the functions of anti-theft opening and safety, so they are widely used in bottled products.

[0004] Currently, there are lids with a separate airtight storage space on the beverage market. The principle of use is as follows: basic raw materials (such as solid powders, concentrated liquids, drugs, or probiotics, etc.) are filled into a lid with an airtight storage space to achieve the storage of the basic raw materials. A container that is matched with the lid and located below the lid contains pure water or a basic solution for mixing with or dissolving the basic raw materials. When drinking, the storage space is opened through a switching mechanism provided on the lid, and the basic raw materials are put into the lower container. After being fully shaken, it can be directly drunk.

[0005] However, when the basic solution is in the form of dairy products, etc., it will undergo an oxidation reaction under the action of oxygen or light, generating a small amount of gas. Currently, there is no bottle cap structure that can effectively discharge this part of the gas.

[0006] In view of this, the present invention is specifically proposed. Summary of the Invention

[0007] An object of the present invention is to provide a bottle cap and a packaging bottle capable of exhausting air and relieving pressure, which can solve or improve the above technical problems.

[0008] The present invention can be implemented as follows:

[0009] In a first aspect, the present invention provides a bottle cap capable of exhausting air and relieving pressure, which includes an upper cover, a middle cover, a lower cover, and a cutter;

[0010] The upper cover includes an upper cover body and a guiding member disposed in the upper cover body;

[0011] The bottom of the middle cover is provided with a first sealing film for sealing the inner cavity of the middle cover. The upper cover is used to be screwed and covered on the top of the middle cover. A storage cavity for accommodating basic raw materials is formed by enclosing between the upper cover, the middle cover and the first sealing film;

[0012] The lower cover includes a lower cover body, a second inner plug ring that can be deformed under the action of tension, and a second sealing film. The lower cover body is a cylindrical structure with an opening at the top and an opening at the bottom. The second inner plug ring is arranged inside the lower cover body. The top of the second inner plug ring is connected to the top of the lower cover body and the second inner plug ring extends along the top of the lower cover body towards the bottom of the lower cover body. An annular installation cavity for inserting the bottle mouth part of the bottle body is formed between the outer wall of the second inner plug ring and the inner wall of the lower cover body. The second sealing film is connected to the bottom of the second inner plug ring and is used to push up the second sealing film when gas is generated in the bottle body. The second sealing film pulls the second inner plug ring to deform the annular installation cavity. The deformed second inner plug ring and the bottle mouth part form an exhaust channel for gas to flow out. The lower cover body is arranged inside the middle cover and is located below the first sealing film;

[0013] The bottom of the cutter is provided with a cutting part and a notch part. The cutter is provided with a strip corresponding to the guiding part of the upper cover. The strip abuts against the guiding part and can move downward along the guiding part when the upper cover is screwed open to synchronously cut the first sealing film and the second sealing film; the length of the cutting part is 1 / 2 - 4 / 5 of the circumference of the cutter.

[0014] In an alternative embodiment, the middle cover includes a first middle cover part and a second middle cover part that are connected to each other. The first middle cover part is used to be connected to the upper cover, and the second middle cover part is used to be connected to the lower cover; the first middle cover part has a cylindrical first inner cavity, and the second middle cover part has a cylindrical second inner cavity. The diameter of the second inner cavity is larger than the diameter of the first inner cavity. The middle cover forms a stepped surface at the junction of the first inner cavity and the second inner cavity;

[0015] A first inner plug ring is arranged in the second inner cavity. The first sealing film is used to seal the bottom of the first inner plug ring in the assembled state; in the assembled state, the top surface of the second sealing film is in contact with the bottom surface of the first sealing film, or there is a gap not exceeding 3 mm between the top surface of the second sealing film and the bottom surface of the first sealing film.

[0016] In an alternative embodiment, an inner wall boss protruding inward along the radial direction is arranged at a position of the second inner plug ring close to the bottom. A sealing installation ring is formed between the lower surface of the inner wall boss and the inner wall of the second inner plug ring below the inner wall boss. The second sealing film is hermetically connected to the sealing installation ring.

[0017] In an alternative embodiment, an outer wall boss protruding outward along the radial direction is arranged at a position of the second inner plug ring close to the bottom. The outer wall boss is located in the annular installation cavity and is used to abut against and seal the inner surface of the bottle mouth part.

[0018] In an alternative embodiment, the thickness of the second sealing film is 20 μm - 100 μm.

[0019] In an alternative embodiment, the distance between the outer wall of the second inner plug ring and the inner wall of the lower cover body is 0.5 mm - 2.5 mm.

[0020] In an alternative embodiment, the thickness of the second inner plug ring is 0.5 mm - 2 mm.

[0021] In an alternative embodiment, the length that the second inner plug ring extends along the top of the lower cover body towards the bottom of the lower cover body is 0.1 mm - 10 mm.

[0022] In an alternative embodiment, after the bottle cap is unscrewed, the cutter extends downward by 0.5 mm - 5 mm relative to the plane where the second sealing film was before cutting, and / or, after the bottle cap is unscrewed, the first sealing film and the second sealing film are bent downward by 45° - 90°.

[0023] In a second aspect, the present invention provides a packaging bottle, which includes the bottle cap as described above. The packaging bottle includes a bottle body and a bottle mouth portion located at the opening of the bottle body, and the bottle mouth portion is inserted into the annular installation cavity of the bottle cap.

[0024] The beneficial effects of the present invention include:

[0025] The lower cover of the bottle cap with exhaust and pressure relief provided by the present invention includes a lower cover body, a second inner plug ring, and a second sealing film. An annular installation cavity is formed between the outer wall of the second inner plug ring and the inner wall of the lower cover body. By pulling the second inner plug ring with the second sealing film, the annular installation cavity is deformed, and the deformed second inner plug ring and the bottle mouth portion form an exhaust channel for gas to flow out, which can realize timely exhaust and pressure relief of the excess gas in the bottle body, avoid situations such as an increase in the pressure of the bottle body and the expansion of the bottle body, and achieve automatic exhaust and pressure relief. At the same time, by using the cooperation of the upper cover and the middle cover to form a storage cavity, a first sealing film is provided at the opening part of the storage cavity, and a second sealing film is provided at the opening part of the lower cover. During the opening process, only by controlling the cutter to rotate and move downward, the first sealing film and the second sealing film can be cut synchronously. By setting the length of the cutting part to 1 / 2 - 4 / 5 of the circumference of the cutter, the base raw material in the storage cavity can effectively drop into the bottle body quantitatively, realizing the quantitative mixing of the base raw material and the liquid in the bottle body, and ensuring that the mixed beverage has a good taste. The packaging bottle with the bottle cap having the above exhaust and pressure relief function has a simple structure, is safe to use, and can be industrially produced. Description of the Drawings

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0027] Figure 1 Explosion view of the exhaust and pressure relief cap provided by the present invention;

[0028] Figure 2 Assembly finished product view of the exhaust and pressure relief cap provided by the present invention;

[0029] Figure 3 Schematic structural view of the upper cover in the exhaust and pressure relief cap provided by the present invention from the first perspective;

[0030] Figure 4 Cross-sectional view of the upper cover in the exhaust and pressure relief cap provided by the present invention;

[0031] Figure 5 Schematic structural view of the upper cover in the exhaust and pressure relief cap provided by the present invention from the second perspective;

[0032] Figure 6 Cross-sectional view of the middle cover in the exhaust and pressure relief cap provided by the present invention;

[0033] Figure 7 Schematic structural view of the middle cover in the exhaust and pressure relief cap provided by the present invention;

[0034] Figure 8 Schematic structural view of the lower cover in the exhaust and pressure relief cap provided by the present invention;

[0035] Figure 9 Schematic structural view of the lower cover with the second sealing film omitted in the exhaust and pressure relief cap provided by the present invention;

[0036] Figure 10 Front view of the lower cover in the exhaust and pressure relief cap provided by the present invention;

[0037] Figure 11 Cross-sectional view of the lower cover in the exhaust and pressure relief cap provided by the present invention when the internal and external air pressures are balanced;

[0038] Figure 12 Cross-sectional view of the lower cover in the exhaust and pressure relief cap provided by the present invention when the second sealing film is lifted and the exhaust channel is opened when the internal and external air pressures are unbalanced;

[0039] Figure 13Cross-sectional view of the cutter in the exhaust and pressure-relief bottle cap provided by the present invention;

[0040] Figure 14 Schematic structural diagram of the cutter in the exhaust and pressure-relief bottle cap provided by the present invention;

[0041] Figure 15 Schematic diagram of the bending structure of the first sealing film after being cut by the cutter in the exhaust and pressure-relief bottle cap provided by the present invention.

[0042] Icon: 10 - Bottle cap;

[0043] 100 - Upper cover; 110 - Guide member; 111 - Connecting edge; 112 - Arc edge; 113 - Vertical edge; 114 - Anti-rotation part; 114a - Vertical short edge; 115 - Sealing ring; 116 - Internal thread of upper cover; 117 - Anti-theft ring of upper cover; 118 - Anti-theft positioning protrusion of upper cover; 119 - First connection point;

[0044] 200 - Middle cover; 201 - Storage cavity; 202 - First upper opening; 203 - First lower opening; 210 - First sealing film; 220 - First middle cover part; 221 - Protrusion; 230 - Second middle cover part; 240 - Step surface; 241 - Sealing ring; 250 - First inner plug ring;

[0045] 300 - Lower cover; 301 - Second upper opening; 302 - Second lower opening; 301 - Lower cover body; 311 - Annular installation cavity; 312 - Exhaust passage; 313 - Lower cover positioning rib; 314 - Internal thread of lower cover; 315 - Outer seal; 316 - Top seal; 317 - Anti-theft ring of lower cover; 318 - Second connection point; 319 - Anti-theft positioning protrusion;

[0046] 320 - Second inner plug ring; 321 - Outer wall boss; 322 - Inner wall boss; 323 - Sealing ring installation ring;

[0047] 330 - Second sealing film;

[0048] 400 - Cutter; 401 - Cutting part; 402 - Notch part; 410 - Card strip; 430 - Guide groove. Detailed implementation manners

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0050] Accordingly, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0051] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not require further definition and explanation in subsequent drawings.

[0052] In the description of the present invention, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship in which the product of the invention is customarily placed. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, if terms such as "first", "second", "third", etc. are used only for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0053] In addition, if terms such as "horizontal" and "vertical" are used, it does not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0054] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "connected" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] It should be noted that the features in the embodiments of the present invention can be combined with each other without conflict.

[0056] Embodiment 1

[0057] Please refer to Figure 1 and Figure 2 , this embodiment provides a cap 10 capable of exhausting air and relieving pressure, which includes an upper cover 100, a middle cover 200, a lower cover 300, and a cutter 400.

[0058] The upper cover 100 includes an upper cover body and a first guiding component disposed within the upper cover body. In some embodiments, the upper cover body is a vertically disposed cylindrical structure with a sealed top and an open bottom. The first guiding component is connected to the inner side of the top of the upper cover body and is arranged in an arc shape along the direction from the top to the bottom of the upper cover 100.

[0059] Combined with Figure 3 and Figure 4 , the upper cover body is provided with a sealing ring 115. The sealing ring 115 is disposed on the upper surface of the upper cover body and extends downward from the upper surface of the upper cover body. The first guiding component is located inside the sealing ring 115. It can also be understood that the sealing ring 115 is disposed between the side wall of the upper cover body and the first guiding component. When the upper cover 100 is covered with the middle cover 200, the upper side wall of the middle cover 200 is located between the first guiding component and the sealing ring 115, thereby ensuring good sealing performance between the upper cover 100 and the middle cover 200.

[0060] In addition, combined with Figure 1 and Figure 5 , the inner wall of the upper cover body is further provided with an internal thread 116 of the upper cover for connecting with the middle cover 200. The bottom of the upper cover body is provided with an anti-theft ring 117 of the upper cover. The inner wall of the anti-theft ring 117 of the upper cover is provided with a plurality of anti-theft positioning protrusions 118 of the upper cover. During the production process of the upper cover 100, the top of the anti-theft ring 117 of the upper cover is connected to the bottom edge of the upper cover body through a plurality of first connection points 119. The anti-theft ring 117 of the upper cover and the upper cover body are integrally formed, and then are cut by an intermittent cutting tool, so as to form a plurality of first connection points 119 at the connection position between the anti-theft ring 117 of the upper cover and the upper cover body. The setting of the plurality of first connection points 119 can ensure the connection between the anti-theft ring 117 of the upper cover and the upper cover body. At the same time, it can also be used to determine whether the product is complete or has been opened.

[0061] The middle cover 200 is a vertically disposed cylindrical structure with an open top and an open bottom. Among them, please combine Figure 6 , the opening at the top of the middle cover 200 is defined as the "first upper opening 202", and the opening at the bottom is defined as the "first lower opening 203". The upper cover 100 is screwed and covered on the top of the middle cover 200. Exemplarily, the upper cover 100 is connected to the first upper opening 202 by a thread.

[0062] Referring to Figure 7 , the bottom of the middle cover 200 is provided with a first sealing film 210 for blocking the internal cavity of the middle cover 200. The circumferential side walls of the upper cover 100, the middle cover 200, and the first sealing film 210 together enclose a storage cavity 201 for accommodating basic raw materials. The basic raw materials accommodated in the storage cavity 201 can be, but are not limited to, solid, semi-solid, liquid and other fillers.

[0063] The diameter of the first lower opening 203 of the middle cover 200 is slightly larger than the outer diameter of the lower cover 300, so that the lower cover 300 can be connected to the first lower opening 203, and the top of the lower cover 300 is located inside the middle cover 200.

[0064] In this embodiment, the middle cover 200 includes a first middle cover part 220 and a second middle cover part 230 which are connected to each other. The first middle cover part 220 is used to connect to the upper cover 100, and the second middle cover part 230 is used to connect to the lower cover 300. The first middle cover part 220 has a cylindrical first inner cavity, and the second middle cover part 230 has a cylindrical second inner cavity. The inner diameter of the second inner cavity is larger than that of the first inner cavity, and a stepped surface 240 is formed at the junction of the first inner cavity and the second inner cavity.

[0065] A first inner plug ring 250 is provided in the second inner cavity of the middle cover 200 described above. The first inner plug ring 250 extends from the stepped surface 240 into the second inner cavity, and the first inner plug ring 250 communicates with the first inner cavity. A first sealing film 210 seals the bottom of the first inner plug ring 250 (it can also be understood that the edge of the first sealing film 210 is connected to the end of the first inner plug ring 250 far from the stepped surface 240), so that a storage cavity 201 for accommodating the base raw material is formed by enclosing between the upper cover 100, the middle cover 200 and the first sealing film 210. Specifically, the upper cover 100, the first inner cavity of the middle cover 200, and the first inner plug ring 250 and the first sealing film 210 together form the storage cavity 201. In the initial state, the cutter 400 is located in the storage cavity 201.

[0066] In some embodiments, a sealing ring 241 is provided on the inner wall of the middle cover 200 corresponding to the stepped surface 240, and the position of the first inner plug ring 250 in the middle cover 200 is located inside the sealing ring 241. The setting of the sealing ring 241 can improve the sealing performance after the bottle cap 10 is connected to the bottle body.

[0067] In this embodiment, the first sealing film 210 can be a composite structure with multiple layers of coating. There are various choices for the first sealing film 210, including but not limited to polyethylene (PE), polyvinyl alcohol (PVOH), polypropylene (PP), ethylene-vinyl acetate (EVA), polyester (PET), aluminum foil, etc.

[0068] In some embodiments, the first sealing film 210 may include a PET outer layer, an Al intermediate layer, and a PE inner layer that are sequentially laminated and connected. The connection of the PET outer layer, the Al intermediate layer, and the PE inner layer can be carried out by conventional pressing techniques, and the edge of the PE inner layer is connected to the bottom of the storage cavity 201. The thickness of this first sealing film 210 can be 20μm - 100μm, such as 20μm, 40μm, 60μm, 80μm, or 100μm, etc.

[0069] By setting the first sealing film 210 to the above structure and material, its appropriate strength can be ensured. By screwing the upper cover 100, the cutter 400 can easily move downward to cut the first sealing film 210. However, it should be noted that to ensure drinking safety, it is necessary to ensure that after the cutter 400 cuts the first sealing film 210, part of the first sealing film 210 is still connected to the first inner plug ring 250.

[0070] For reference, taking the example of placing solid powder in the storage cavity 201, the particle size of the solid powder can be, for example, not more than 0.5 mm, which is beneficial to avoid powder jamming during the downward rotation of the cutter 400. Further, the filling amount of the solid powder in the storage cavity 201 should not be too much to avoid too much solid powder hindering the screwing of the cutter 400, making it difficult for the cutter 400 to cut the first sealing film 210 to the preset opening degree.

[0071] The setting of the first inner plug ring 250 can ensure that even when the overall volume of the middle cover 200 is small, the storage cavity 201 still has a large volume; when the outer diameter of the second inner plug ring 320 is slightly smaller than the inner diameter of the bottle mouth of the bottle body, after the bottle body is connected to the bottle cap 10, the second inner plug ring 320 just fits into the bottle mouth, which can play a good sealing role.

[0072] In this embodiment, please also combine Figures 8 to 12 , the lower cover 300 includes a lower cover body 310, a second inner plug ring 320 and a second sealing film 330. The lower cover body 310 is a cylindrical structure with a top opening (defined as the "second upper opening 301") and a bottom opening (defined as the "second lower opening 302") arranged vertically. The diameter of the second upper opening 301 is slightly larger than the outer diameter of the first inner plug ring 250.

[0073] The second inner plug ring 320 is integrally formed with the lower cover body 310 and is arranged inside the lower cover body 310. The second inner plug ring 320 extends from the top of the lower cover body 310 towards the bottom. The top of the second inner plug ring 320 is fixedly connected to the top of the lower cover body 310. An annular installation cavity 311 for inserting the bottle mouth part (not shown in the figure) of the bottle body (not shown in the figure) is formed between the outer wall of the second inner plug ring 320 and the inner wall of the lower cover body 310. The second sealing film 330 is connected to the bottom of the second inner plug ring 320 to push up the second sealing film 330 when gas is generated in the bottle body. The second sealing film 330 pulls the second inner plug ring 320 to deform the annular installation cavity 311, and the deformed second inner plug ring 320 and the bottle mouth part form an exhaust channel 312 for gas to flow out (such as Figure 12 ).

[0074] In this embodiment, the lower cover body 310 is disposed within the middle cover 200 and below the first sealing film 210. When the lower cover 300 and the middle cover 200 are in an assembled state, the top surface of the second sealing film 330 is in contact with or has a gap of no more than 3 mm from the bottom surface of the first sealing film 210, so that the first sealing film 210 and the second sealing film 330 can be cut simultaneously.

[0075] In this embodiment, the second sealing film 330 is used to seal the opening surrounded by the second inner plug ring 320. When the second sealing film 330 is squeezed by the gas pressure inside the bottle, it will bulge upward. At this time, the second sealing film 330 can pull the second inner plug ring 320 to produce a slight movement, thereby opening the seal within the annular installation cavity 311, thus forming an exhaust passage 312 for the gas inside the bottle to be discharged, and further realizing exhaust and pressure relief.

[0076] The structure of the above-mentioned lower cover body 310 is similar to that of the conventional bottle cap 10, and it can also adopt the design method of the existing conventional bottle cap 10, as long as it can achieve connection and sealing of the bottle body.

[0077] Specifically in this embodiment, please refer to Figures 8 to 12 , a plurality of lower cover positioning convex ribs 313 are vertically provided on the outer wall of the lower cover body 310; the provision of the lower cover positioning convex ribs 313 facilitates increasing the friction at the contact position between the consumer and the bottle cap 10, thereby facilitating the opening of the bottle cap 10.

[0078] An inner thread 314 of the lower cover for matching with the external thread of the bottle mouth (not shown in the figure) is provided on the inner wall of the lower cover body 310 (such as Figure 12 ); the inner thread 314 of the lower cover and the external thread of the bottle mouth are threadedly connected, which can well assemble the bottle body and the bottle cap 10, thereby realizing the sealing of the product stored in the bottle body. At the same time, it can also be realized that when the lower cover body 310 rotates upward along the inner thread 314 of the lower cover, the lower cover body 310 can be separated from the bottle body to open the bottle mouth part of the bottle body, and when the lower cover body 310 rotates downward along the inner thread 314 of the lower cover, the lower cover body 310 can be threadedly connected with the bottle body to close the bottle mouth part of the bottle body, so as to seal the unfinished product in the bottle body again.

[0079] Please refer to Figure 11 and Figure 12, To enhance the sealing effect, in this embodiment, an outer seal 315 for sealing the outer surface of the bottle mouth part and a top seal 316 for sealing the top surface of the bottle mouth part are provided on the inner side of the top of the lower cover body 310. The top seal 316 is located between the outer seal 315 and the second inner plug ring 320. Among them, both the outer seal 315 and the top seal 316 are structures protruding downward from the inner side of the top of the lower cover body 310. The protruding height of the top seal 316 is less than that of the outer seal 315. Through the settings of the outer seal 315 and the top seal 316, both the outer side and the top of the bottle mouth part of the bottle body are sealed, and the sealing effect is better.

[0080] A lower cover anti-theft ring 317 is further provided at the bottom of the lower cover body 310, and the lower cover anti-theft ring 317 is located below the lower cover positioning rib 313. During the production of the lower cover 300, the top of the lower cover anti-theft ring 317 is connected to the bottom edge of the lower cover body 310 through a plurality of second connection points 318. The lower cover anti-theft ring 317 and the lower cover body 310 can be integrally formed, and then intermittently cut by a cutting knife to form a plurality of second connection points 318 at the connection position between the lower cover anti-theft ring 317 and the lower cover body 310. The setting of the plurality of second connection points 318 can ensure the connection between the lower cover anti-theft ring 317 and the lower cover body 310. At the same time, it can also be used to judge whether the product is complete or has been opened. Among them, a plurality of anti-theft positioning protrusions 319 for clamping the bottle mouth part are arranged at intervals on the inner surface of the lower cover anti-theft ring 317. Correspondingly, a continuous anti-theft retaining ring is provided below the outer thread of the bottle mouth of the bottle mouth part. The anti-theft retaining ring protrudes from the outer surface of the bottle mouth part. A bottle mouth positioning groove is formed between the anti-theft retaining ring and the bottom protrusion of the bottle mouth part. The anti-theft positioning protrusion 319 is embedded in the bottle mouth positioning groove and can rotate in the bottle mouth positioning groove. When rotating the lower cover 300, the lower cover body 310 will move upward under the cooperation of the inner thread 314 of the lower cover and the outer thread of the bottle mouth, while the anti-theft positioning protrusion 319 can only rotate in the bottle mouth positioning groove but cannot move up and down. When the turning force is greater than the connection force of the plurality of second connection points 318 between the current lower cover body 310 and the lower cover anti-theft ring 317, the lower cover body 310 is separated from the lower cover anti-theft ring 317 to open the lower cover body 310, and the lower cover anti-theft ring 317 remains in the bottle mouth positioning groove of the bottle body.

[0081] In this embodiment, the second inner plug ring 320 is used to seal the bottle mouth part, and at the same time, when the internal pressure is greater than the external pressure, it can be stretched and deformed by the second sealing film 330 so that the sealing state becomes an exhaust and pressure relief state.

[0082] Specifically, in combination with Figure 11 and Figure 12, the sealing of the bottle mouth is achieved by using the outer wall boss 321. The outer wall boss 321 is arranged at a position close to the bottom of the second inner plug ring 320 and protrudes outward along the radial direction of the second inner plug ring 320. The outer wall boss 321 is located in the annular installation cavity 311 and is used to abut against and seal the inner surface of the bottle mouth. The outer wall boss 321 is an arc-shaped structure, and when the bottle mouth contacts the outer wall boss 321, it can be squeezed, strengthening the sealing effect on the inner side of the bottle mouth.

[0083] The connection between the second inner plug ring 320 and the second sealing film 330 is achieved by using the inner wall boss 322. The inner wall boss 322 is arranged at a position close to the bottom and protrudes inward along the radial direction of the second inner plug ring 320. A sealing installation ring 323 is formed between the lower surface of the inner wall boss 322 and the inner wall of the second inner plug ring 320 below the inner wall boss 322, and the second sealing film 330 is hermetically connected to the sealing installation ring 323. The setting of the inner wall boss 322 can provide space for the connection of the second sealing film 330 and can achieve hot melt connection to both the side edge and the top of the second sealing film 330, with better connection effect and connection strength, which can ensure that the second sealing film 330 is lifted when the internal pressure is greater than the external pressure, thereby driving the movement of the second inner plug ring 320. In addition, the setting of the inner wall boss 322 can also provide a supporting force for the edge of the second sealing film 330, avoiding the situation of rupture at the edge of the second sealing film 330.

[0084] In order to realize the deformation of the second inner plug ring 320 pulled by the second sealing film 330, in this embodiment, the thickness of the second inner plug ring 320 can also be limited to 0.5 mm - 2 mm; the extension length of the second inner plug ring 320 is 0.1 mm - 10 mm. In some embodiments, the thickness of the second inner plug ring 320 can be, for example, any one of 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm or the range value between any two of them. In some embodiments, the extension length of the second inner plug ring 320 can be, for example, any one of 0.1 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm or the range value between any two of them.

[0085] Further, the material of the second inner plug ring 320 can be HDPE, which is high-density polyethylene. It is an environmentally friendly material. The film has low permeability to water vapor and air and low water absorption. Therefore, it can well seal the bottle mouth and is also convenient for sealing connection with the second sealing film 330. It has good hardness and tensile strength. It can be easily deformed under the action of external forces (such as internal and external pressures) while ensuring the sealing performance, and can return to its original position after the external force disappears. It should be understood that in this embodiment, when the second sealing film 330 bulges to pull the second inner plug ring 320, the change range of the second inner plug ring 320 is very small, and only a very small gap needs to be formed as the exhaust channel 312 for the excess gas in the bottle body to be discharged.

[0086] The gap distance of the annular installation cavity 311 formed between the outer wall of the second inner plug ring 320 and the inner wall of the lower cover body 310 can be 0.5 mm - 2.5 mm (that is, the distance between the outer wall of the second inner plug ring 320 and the inner wall of the lower cover body 310 is 0.5 mm - 2.5 mm). The size of the annular installation cavity 311 corresponds to the thickness of the bottle mouth part of the bottle body, which is convenient for the bottle mouth part to be inserted into the annular installation cavity 311.

[0087] The second sealing film 330 in this embodiment is a film structure. It can be lifted and bulged when the internal pressure is greater than the external pressure, that is, the second sealing film 330 changes from a planar structure to an arc structure, presenting a structure with both sides low and the middle high. Since the edge of the second sealing film 330 is hermetically connected to the sealing installation ring 323 of the second inner plug ring 320, during the process of the second sealing film 330 being lifted, it can drive the second inner plug ring 320 to undergo slight deformation (as Figure 12 shown), thereby opening a gap in the annular installation cavity 311 to form an exhaust channel 312, and the excess gas in the bottle body can be discharged from the exhaust channel 312 to achieve the purpose of exhaust and pressure relief.

[0088] It should be understood that the installation position of the second sealing film 330 in this embodiment should be as close as possible to the bottom of the second inner plug ring 320, so as to facilitate the second sealing film 330 to pull the second inner plug ring 320. If the second sealing film 330 is arranged at the top or middle of the second inner plug ring 320, it is difficult to pull the second inner plug ring 320 to deform it, and thus it is difficult to open the annular installation cavity 311 to form an exhaust channel 312 for exhaust and pressure relief.

[0089] For reference, the film structure of the second sealing film 330 can also be a multi-layer coated composite structure. There are various choices for the second sealing film 330, such as the materials of the second sealing film 330 of conventional dairy products such as milk or yogurt, including but not limited to polyethylene (PE), polyvinyl alcohol (PVOH), polypropylene (PP), ethylene vinyl acetate (EVA), polyester (PET), aluminum foil, etc.

[0090] Specifically, the second sealing film 330 in this embodiment includes a PET outer layer, an Al intermediate layer, and a PE inner layer that are sequentially overlapped and connected. The connection of the PET outer layer, the Al intermediate layer, and the PE inner layer can be carried out by conventional pressing techniques. The edge of the PE inner layer is hermetically heat-sealed to the sealing mounting ring 323. In this embodiment, through the form of multi-layer film lamination, the second sealing film 330 can have strong strength and is not easily damaged. At the same time, the thickness of the second sealing film 330 is limited to 20μm - 100μm, so that it has good flexibility and can deform under the pressure of the excess gas in the bottle body and drive the second inner plug ring 320 to deform.

[0091] In other embodiments, the second sealing film 330 may also include an Al layer and an adhesive layer coated on the Al layer. The edge of the adhesive layer is hermetically heat-sealed to the sealing mounting ring 323.

[0092] That is to say, in this embodiment, there are various choices for the material or structure of the second sealing film 330, as long as it can deform and bulge under a certain air pressure and has a certain strength to pull the second inner plug ring 320.

[0093] Please refer to Figures 13 to 15 , in this embodiment, the cutter 400 has a cylindrical structure with an open top and an open bottom. The cutter 400 is provided with a first mating component that cooperates with the first guiding component. In the initial state, the cutter 400 is located in the storage cavity 201.

[0094] Please refer to Figure 3 and Figure 13 , the first guiding component includes a plurality of guiding members 110 distributed in an annular array. Each guiding member 110 is vertically arranged. Each guiding member 110 includes a connecting edge 111 and an arc edge 112 (as shown in Figure 3 ). The connecting edge 111 is connected to the inner top wall of the upper cover 100, and one end of the connecting edge 111 is connected to the arc edge 112.

[0095] The first mating component includes a plurality of clamping bars 410 having the same number as the guiding members 110 (as shown in Figure 14 ), that is to say, the cutter 400 is provided with clamping bars 410 corresponding to the guiding members 110 of the upper cover 100. Each clamping bar 410 is vertically arranged on the inner wall of the cutter 400 and extends to the top of the cutter 400. All the clamping bars 410 are distributed in an annular array on the inner wall of the cutter 400.

[0096] Under the initial condition, the cutter 400 is sleeved outside the first guiding assembly, and each clamping strip 410 is located between two adjacent guiding members 110. When the upper cover 100 is screwed, the guiding member 110 rotates, so that each clamping strip 410 moves along the arc edge 112, thereby driving the cutter 400 to rotate and move downward.

[0097] Each of the above-mentioned guiding members 110 further has a vertical edge 113 (such as Figure 3 ), and the vertical edge 113 is connected to one end of the connecting edge 111 away from the arc edge 112. The interval between two adjacent guiding members 110 is matched with the size of the clamping strip 410 (for example, the interval between two adjacent guiding members 110 is the same as the size of the clamping strip 410). When the upper cover 100, the cutter 400 and the middle cover 200 are just assembled together and not screwed, the clamping strip 410 just abuts against the vertical edge 113. After starting to screw the upper cover 100, the clamping strip 410 separates from the vertical edge 113 and moves along the track of the arc edge 112.

[0098] In some embodiments, it can also be understood that: the guiding member 110 is in a triangular shape. The first side (connecting edge 111) is in an arc shape and is connected to the inner wall of the top of the upper cover body. The second side (vertical edge 113) is perpendicular to the inner wall of the top of the upper cover body and extends along the direction away from the top of the upper cover body. The third side (arc edge 112) is in an arc shape and smoothly connects from the first side to the top of the second side. The cutter 400 moves along the third side. That is, the third side plays a guiding role for the cutter 400.

[0099] Furthermore, each guiding member 110 may further have a rotation prevention portion 114 (such as Figure 3 ), the rotation prevention portion 114 is arranged at one end of the arc edge 112 away from the connecting edge 111, and the side of the rotation prevention portion 114 close to the arc edge 112 may be a vertical short edge 114a for example.

[0100] When the clamping strip 410 moves along the arc edge 112, when it moves to the end of the arc edge 112, it will be blocked by the vertical short edge 114a to prevent it from continuing to move, thereby playing a role in preventing rotation, and further effectively preventing the cutter 400 from rotating excessively and causing the first sealing film 210 and the second sealing film 330 to be completely cut.

[0101] In this embodiment, please refer to Figures 13 to 15, the bottom end of the cutter 400 has a cutting part 401 and a notch part 402 connected end to end. Exemplarily, the length of the cutting part 401 can account for 1 / 2 - 4 / 5 of the circumference of the cutter 400, and the cutting part 401 has a plurality of cutting teeth. It can be understood that the area without cutting teeth on the circumference of the bottom end of the cutter 400 forms the notch part 402, so that after the cutting teeth cut the first sealing film 210 and the second sealing film 330 in a circle along the circumference, both the first sealing film 210 and the second sealing film 330 have remaining uncut positions, so that the first sealing film 210 and the second sealing film 330 will not fall into the bottle body after being opened.

[0102] By screwing the upper cover 100, the first guiding component cooperates with the first matching component to drive the cutter 400 to rotate downward and move. The cutting part 401 of the cutter 400 cuts the first sealing film 210 and the second sealing film 330 successively. A part of the first sealing film 210 corresponding to the notch part 402 is still connected to the bottom of the storage cavity 201, and a part of the second sealing film 330 corresponding to the notch is still connected to the lower cover 300, effectively preventing the first sealing film 210 and the second sealing film 330 from falling into the bottle body. Continuing to screw the upper cover 100, the cutter 400 extends downward relative to the plane where the second sealing film 330 is located before cutting (the extension length can be, for example, 0.5 mm - 5 mm). At the above extension length, the first sealing film 210 and the second sealing film 330 can be pushed downward to bend, and the bending angle is controlled to be 45° to 90°. It should be noted that the above "bending angle" refers to the angle between the plane where the sealing film is located after bending and the plane where the sealing film is located before being cut.

[0103] The above setting can enable the basic raw materials in the storage cavity 201 to be effectively quantitatively dropped into the bottle body, realizing the quantitative mixing of the basic raw materials and the liquid in the bottle body, and ensuring that the mixed beverage has a good taste.

[0104] Continuing from the above, for the bottle cap 10 provided in this embodiment, the cutting part 401 and the notch part 402 provided at the bottom end of the cutter 400, in cooperation with the first sealing film 210 inside the middle cover 200, the second sealing film 330 of the lower cover 300 and other structures, and the scheme that the cutter 400 extends downward by 0.5 mm - 5 mm, can realize that during the opening process of the bottle cap 10, the cutter 400 cuts the first sealing film 210 and the second sealing film 330 successively, and pushes the first sealing film 210 and the second sealing film 330 downward to bend the first sealing film 210 and the second sealing film 330 at an appropriate angle, so as to enable the basic raw materials (such as solid powder) placed in the storage cavity 201 to be smoothly discharged from the second lower opening 302. When the bottle cap 10 is set on the bottle body, the above basic raw materials (such as solid powder) can be smoothly discharged into the bottle body from the second lower opening 302 and mixed with the liquid contained in the bottle body, which can improve or solve the situation that the second sealing film 330 blocks the downward discharge of the solid powder.

[0105] In this embodiment, a second guiding assembly is further provided on the side wall of the middle cover 200 corresponding to the storage cavity 201, and a second mating assembly cooperating with the second guiding assembly is provided on the outer wall of the cutter 400.

[0106] Please refer to Figure 6 and Figure 14 , the second guiding assembly includes a plurality of protrusions 221 provided on the side wall of the middle cover 200 corresponding to the storage cavity 201, and the second mating assembly includes a plurality of guiding grooves 430 provided on the outer wall of the cutter 400.

[0107] When the upper cover 100 is screwed, each guiding groove 430 moves to make the corresponding protrusion 221 located in the guiding groove 430, and each guiding groove 430 is stuck outside the corresponding protrusion 221 to make the cutter 400 move along the extending direction of the guiding groove 430.

[0108] In other embodiments of the present invention, the second guiding assembly includes a plurality of guiding grooves 430 provided on the side wall of the middle cover 200 corresponding to the storage cavity 201, and the second mating assembly includes a plurality of protrusions 221 provided on the outer wall of the cutter 400. When the upper cover 100 is screwed, each protrusion 221 moves into the corresponding guiding groove 430 and moves along the extending direction of the guiding groove 430.

[0109] Continuing from the above, the working principle of the bottle cap 10 provided in this embodiment includes:

[0110] When the bottle cap 10 is connected to the bottle body, the external thread of the bottle mouth of the bottle body cooperates with the internal thread 314 of the lower cover of the lower cover 300 to achieve a sealed connection. When in use, the upper cover 100 is screwed open, and the clamping strip 410 moves downward along the guiding member 110 to synchronously cut the first sealing film 210 and the second sealing film 330. At this time, the storage cavity 201 is opened, and the basic raw material leaks from the storage cavity 201 into the bottle body, completing the opening.

[0111] The lower cover 300 forms an annular installation cavity 311 by using the gap between the second inner plug ring 320 and the inner wall of the lower cover body 310. The mouth part of the bottle body is inserted into the annular installation cavity 311 to achieve installation and sealing. The second sealing film 330 connected to the bottom of the second inner plug ring 320 can be lifted when gas is generated in the bottle body. The deformation of the second sealing film 330 will pull the second inner plug ring 320 to produce a slight movement, thereby opening the seal in the annular installation cavity 311 to form an exhaust channel 312 for the gas in the bottle body to be discharged, so as to achieve exhaust and pressure relief. The structure of the bottle cap 10 provided in this embodiment is simple. Only the second sealing film 330 that can undergo a certain deformation when the air pressure in the bottle body is greater than the external air pressure needs to be set. By using the second sealing film 330 to pull the second inner plug ring 320, the excess gas in the bottle body can be effectively exhausted and the pressure can be relieved in time, effectively avoiding the occurrence of situations such as increased bottle body pressure and bottle body expansion, improving the safety of the packaging bottle. Moreover, the bottle cap 10 provided by the present invention can achieve automatic exhaust and pressure relief without manual operation, and its structure is simple, which can be industrially produced.

[0112] In addition, there are various choices for the material of the second sealing film 330, and the application range is wide. Using a double-layer film for sealing can achieve the effect of separating dry and wet, ensure that the taste and efficacy of the product remain unchanged during the shelf life, realize the smooth addition of sensitive substances, effectively extend the shelf life of the product, and ensure the good quality of the product.

[0113] Embodiment 2

[0114] This embodiment provides a packaging bottle, which includes the bottle cap 10 provided in Embodiment 1. In addition, the packaging bottle further includes a bottle body and a mouth part located at the opening of the bottle body, and the mouth part is inserted into the annular installation cavity 311 of the bottle cap 10.

[0115] Since the structure of the bottle body in this embodiment is substantially the same as that of the existing bottle body, and its mouth part is also substantially the same as that of the existing bottle body. Specifically, an external thread of the mouth part is provided, and this external thread of the mouth part can be matched with the internal thread 314 of the lower cover on the inner wall of the lower cover body 310 (please refer to Figure 11 and Figure 12 ), to achieve the threaded connection between the lower cover body 310 and the mouth part, and it is also convenient for the lower cover body 310 to be opened or closed when rotating along the internal thread 314 of the lower cover.

[0116] Please refer to Figure 11 and Figure 12, correspondingly, an anti-theft retaining ring and a bottom protrusion are further provided at the bottle mouth portion. A bottle mouth positioning groove is formed between the anti-theft retaining ring and the bottom protrusion. The bottle mouth positioning groove is used to accommodate the lower cover anti-theft ring 317, so that the lower cover anti-theft ring 317 can rotate in the bottle mouth positioning groove but cannot move up and down. When the rotational force is greater than the connection force of the multiple second connection points 318 between the current lower cover body 310 and the lower cover anti-theft ring 317, the lower cover body 310 is separated from the lower cover anti-theft ring 317, realizing the opening of the lower cover body 310, and the lower cover anti-theft ring 317 remains in the bottle mouth positioning groove of the bottle body.

[0117] Based on the conventional bottle body structure, in this embodiment, the bottle cap 10 in Embodiment 1 is used as the sealing structure of the bottle body. It can not only achieve the basic sealing function, but also realize the functions of storing items and exhausting air and relieving pressure (no air leakage and pressure relief under the condition of 30 PSI, and automatic air leakage and pressure relief under the condition of 80 PSI). It can achieve the effect of separating dry and wet, ensure the taste and efficacy of the product during the shelf life, realize the smooth addition of sensitive substances, effectively extend the shelf life of the product, and ensure the good quality of the product. The packaging bottle in this embodiment is particularly suitable for packaging carbonated beverages or gas-producing beverages, and of course, it is also suitable for packaging other conventional beverages or conventional foods.

[0118] It should be understood that in this embodiment, a protective cover (not shown in the figure) can also be provided on the upper part of the bottle cap 10. The setting of the protective cover can avoid the situation that the second sealing film 330 is broken under the impact of sharp foreign objects during the transportation or storage of the packaging bottle, improving the overall safety of the packaging bottle.

[0119] During production, the upper cover 100 and the middle cover 200 can be assembled on one production line, that is, the basic raw materials are placed in the placement cavity 201, and the upper cover 100 and the middle cover 200 are assembled; the lower cover 300 and the bottle body are assembled on one production line, the liquid material is filled in the bottle body, and the bottle body is sealed by the lower cover 300. After the products on both production lines are filled and assembled, the first lower opening 203 of the middle cover 200 is covered on the lower cover 300 to complete the aseptic production of the entire beverage product.

[0120] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. An exhaust and pressure relief bottle cap, characterized in that, It includes an upper cover, a middle cover, a lower cover and a cutter; The upper cover includes an upper cover body and a guiding member disposed within the upper cover body; A first sealing film for sealing the inner cavity of the middle cover is provided at the bottom of the middle cover. The upper cover is used to be screwed onto the top of the middle cover. A storage cavity for accommodating basic raw materials is formed by enclosing the upper cover, the middle cover and the first sealing film; The lower cover includes a lower cover body, a second inner plug ring that can be deformed under the action of a pulling force, and a second sealing film. The lower cover body is a cylindrical structure with an opening at the top and an opening at the bottom that is vertically arranged. The second inner plug ring is disposed within the lower cover body. The top of the second inner plug ring is connected to the top of the lower cover body and the second inner plug ring extends along the top of the lower cover body towards the bottom of the lower cover body. An annular installation cavity for inserting the mouth portion of the bottle body is formed between the outer wall of the second inner plug ring and the inner wall of the lower cover body. The second sealing film is connected to the bottom of the second inner plug ring to push up the second sealing film when gas is generated within the bottle body. The second sealing film pulls the second inner plug ring to deform the annular installation cavity. The deformed second inner plug ring and the mouth portion form an exhaust passage for the gas to flow out. The lower cover body is disposed within the middle cover and is located below the first sealing film; A cutting portion and a notch portion are provided at the bottom of the cutter. The cutter is provided with a clamping strip corresponding to the guiding member of the upper cover. The clamping strip abuts against the guiding member and can move downward along the guiding member when the upper cover is unscrewed to synchronously cut the first sealing film and the second sealing film; The length of the cutting portion is 1 / 2 - 4 / 5 of the circumference of the cutter.

2. The bottle cap according to claim 1, characterized in that, The middle cover includes a first middle cover portion and a second middle cover portion that are connected to each other. The first middle cover portion is used to be connected to the upper cover, and the second middle cover portion is used to be connected to the lower cover; The first middle cover portion has a cylindrical first inner cavity, and the second middle cover portion has a cylindrical second inner cavity. The diameter of the second inner cavity is larger than the diameter of the first inner cavity. The middle cover forms a stepped surface at the junction of the first inner cavity and the second inner cavity; A first inner plug ring is provided within the second inner cavity. The first sealing film is used to seal the bottom of the first inner plug ring in the assembled state; In the assembled state, the top surface of the second sealing film is in contact with the bottom surface of the first sealing film, or there is a gap of no more than 3 mm between the top surface of the second sealing film and the bottom surface of the first sealing film.

3. The bottle cap according to claim 1, characterized in that, An inner wall boss protruding inward in the radial direction is provided at a position near the bottom of the second inner plug ring. A sealing installation ring is formed between the lower surface of the inner wall boss and the inner wall of the second inner plug ring below the inner wall boss. The second sealing film is hermetically connected to the sealing installation ring.

4. The bottle cap according to claim 1, characterized in that, An outer wall boss protruding outward in the radial direction is provided at a position near the bottom of the second inner plug ring. The outer wall boss is located within the annular installation cavity. The outer wall boss is used to abut against and seal the inner surface of the mouth portion of the bottle.

5. The bottle cap according to any one of claims 1-4, characterized in that, The thickness of the second sealing film is 20μm - 100μm.

6. The bottle cap according to any one of claims 1-4, characterized in that The distance between the outer wall of the second inner plug ring and the inner wall of the lower cover body is 0.5 mm - 2.5 mm.

7. The bottle cap according to any one of claims 1 to 4, characterized in that, The thickness of the second inner plug ring is 0.5 mm - 2 mm.

8. The bottle cap according to any one of claims 1 to 4, characterized in that, The length that the second inner plug ring extends along the top of the lower cover body towards the bottom of the lower cover body is 0.1 mm - 10 mm.

9. The bottle cap according to any one of claims 1-4, characterized in that, After the bottle cap is unscrewed, the cutter extends downward by 0.5 mm - 5 mm relative to the plane where the second sealing film is located before cutting, and / or after the bottle cap is unscrewed, the first sealing film and the second sealing film are bent downward by 45° - 90°.

10. A packaging bottle, characterized in that, It includes the bottle cap according to any one of claims 1 - 9, the packaging bottle includes a bottle body and a bottle mouth part located at the opening of the bottle body, and the bottle mouth part is inserted into the annular installation cavity of the bottle cap.

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