A bottle cap for a liquid packaging container

Abstract

The application provides a bottle cap for a liquid packaging container, which comprises an inner cap and an outer cap. The inner cap comprises a cap top and a cap barrel. The outer cap is detachably connected with the cap barrel. The bottom barrel mouth of the cap barrel is detachably connected with the packaging container. The outer edge of the cap top is connected with the top barrel mouth of the cap barrel, and the top of the cap top is flush with the top barrel mouth of the cap barrel. The cap top comprises a tearable seal and a pull ring arranged on the upper surface of the tearable seal. The pull ring is fixedly connected with the tearable seal through a fixed column. The pull ring is arranged on the top of the cap. When the injection mold is designed, the pull ring can be parted and demolded without forced demolding. The leakage rate of the liquid packaging container is ensured, and the pull-off force of the tearable seal of the pull ring is small, so that the user experience is improved.

Description

Technical Field

[0001] This application relates to the field of liquid container cap technology, and in particular to a bottle cap for liquid packaging containers. Background Technology

[0002] Currently, commonly used liquid containers such as cooking oil bottles, soy sauce bottles, engine oil drums, and bag-in-box containers all have a liquid outlet under the cap. To ensure that the liquid outlet does not leak during transportation or sales, manufacturers seal the liquid outlet with a sealing device when the product leaves the factory. The sealing device commonly used by manufacturers is to set an easy-tear sealing strip inside the liquid outlet, with a pull ring on the sealing strip.

[0003] When using, open the outer cap that matches the protective cylinder to prevent the pull ring from being damaged by external force, pull the pull ring on the easy-tear sealing strip, tear off the easy-tear sealing strip, and take it out so that the liquid can be poured out. The outer cap can be closed again to provide a certain degree of sealing.

[0004] However, in the existing design, the pull ring and easy-tear seal are located inside the protective cylinder. The pull ring connecting the easy-tear seal is a circular ring. During injection molding and demolding, the pull ring is recessed into the groove shaped like the pull ring in the cylindrical mold core that fills the space between the inner wall of the protective cylinder and the inner circle of the pull ring. It can only be forcibly pulled out of the mold. Even a slightly large pulling force will damage or tear the easy-tear line on the edge of the easy-tear seal, resulting in scrap. Even a small tear in the easy-tear line, if not detected, can cause leakage when used in liquid packaging containers. If, in order to ensure that the pull ring does not damage the easy-tear line on the edge of the easy-tear seal during forced demolding, the adhesive layer at the edge of the easy-tear seal connecting the easy-tear seal to the cap needs to be thickened, this would make the easy-tear seal very difficult to tear off, or even cause the pull ring to break, making the easy-tear seal impossible to remove. Users would then have to use other tools to open the easy-tear seal. Summary of the Invention

[0005] In view of the aforementioned problems, this application is made to provide a bottle cap for a liquid packaging container that overcomes or at least partially solves the aforementioned problems, comprising: The inner cover includes an inner cap and an outer cap. The inner cap includes a cap top and a cap tube. The outer cap is detachably connected to the cap tube. The bottom opening of the cap tube is detachably connected to the packaging container. The outer edge of the cap top is connected to the top opening of the cap tube, and the cap top is flush with the top opening of the cap tube. The cap top of the inner cap includes an easy-tear sealing sheet and a pull ring disposed on the upper surface of the easy-tear sealing sheet. The pull ring is fixedly connected to the easy-tear sealing sheet by a fixed post.

[0006] Furthermore, the cover cylinder includes a first upper sealing cylinder and a lower sealing cylinder, wherein the first upper sealing cylinder and the lower sealing cylinder are integrally connected.

[0007] Furthermore, the lower sealing cylinder of the cap is provided with at least one sealing ring on the outer or inner wall of the bottom cylinder opening, the sealing ring being used to seal the outlet of the liquid packaging container.

[0008] Furthermore, the outer wall of the lower sealing cylinder is provided with at least one positioning ring, which is used to position the bottle cap at the outlet of the liquid packaging container before filling.

[0009] Furthermore, the cover cylinder includes a second upper sealing cylinder.

[0010] Furthermore, the bottom cylinder of the second upper sealing cylinder is provided with at least one sealing ring on the inner or outer wall of the cylinder diameter, the sealing ring being used to seal the outlet of the liquid packaging container.

[0011] Furthermore, the outer wall of the first upper sealing cylinder or the outer wall of the second upper sealing cylinder is provided with a retaining ring or buckle that engages with the outer cover.

[0012] Furthermore, the outer wall of the first upper sealing cylinder, the outer wall of the second upper sealing cylinder, or the outer wall of the lower sealing cylinder is provided with a convex ring or lug for clamping.

[0013] Furthermore, the outer wall of the first upper sealing cylinder or the outer wall of the second upper sealing cylinder is provided with threads or snaps that mate with the outer cover.

[0014] This application has the following advantages: In the embodiments of this application, compared to the prior art where the pull ring recessed in the protective tube under the bottle cap is subject to slightly greater pulling force during forced demolding, which can damage or even tear the easy-tear line on the edge of the easy-tear seal, resulting in waste, even minor damage to the easy-tear line can cause leakage when used in liquid packaging containers. If the adhesive layer of the easy-tear seal at the edge of the easy-tear line connecting the easy-tear seal to the cap is thickened, the easy-tear seal will become difficult to tear off, and the pull ring may even break, making the easy-tear seal impossible to remove, and the user can only open the easy-tear seal with other tools. This application provides a solution in which the pull ring is set on the top of the inner cap, specifically: the inner cap includes a cap top and a cap tube, the outer cap is detachably connected to the cap tube, the bottom diameter of the cap tube is fixedly connected to the packaging container, the outer edge of the cap top is connected to the top diameter of the cap tube, and the cap top and the top diameter of the cap tube are at the same level. By raising the top of the cap to a position flush with the top diameter of the cap cylinder, the top of the cap includes an easy-tear sealing sheet and a pull ring disposed on the upper surface of the easy-tear sealing sheet. The pull ring is fixedly connected to the easy-tear sealing sheet by a fixed post. In the injection mold design, the outer mold of the pull ring can be designed separately, solving the problem in the prior art where the pull ring easily tears or even breaks the easy-tear line on the edge of the easy-tear sealing sheet during forced demolding. The deepened protective outer cap prevents the exposed pull ring on the top of the inner cap from being damaged by external forces during logistics. In the injection mold design, since there is no protective cylinder restricting the outside of the pull ring, the outer mold of the pull ring can be separated and demolded without forced demolding. The pulling force transmitted to the easy-tear seal through the connecting post between the pull ring and the easy-tear seal is very small. This ensures that even with a relatively thin adhesive layer at the edge of the easy-tear seal connecting the cap and the easy-tear seal, damage to the edge of the easy-tear seal during demolding is still avoided. This not only ensures a low leakage rate for liquid packaging containers but also minimizes the pull force on the pull ring and easy-tear seal, improving the user experience. Attached Figure Description

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

[0016] Figures 1-4 This is a schematic diagram of the structure of a bottle cap for a liquid packaging container provided in one embodiment of this application.

[0017] Explanation of reference numerals in the attached figures: 10. Inner cover; 20. Top cover; 30. Cover cylinder; 21. Easy-tear sealing piece; 22. Pull ring; 23. Fixing column; 31. First upper sealing cylinder; 32. Lower sealing cylinder; 33. Thread; 40. Raised ring; 50. Outer cover. Detailed Implementation

[0018] To make the objectives, features, and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0019] The inventors, through analysis of existing technology, discovered that in current designs, the pull ring and easy-tear sealing strip are located within the protective cylinder. The pull ring connecting the easy-tear sealing strip is a circular ring. During injection molding and demolding, due to the restriction of the protective cylinder, the pull ring can only be embedded in a grooved ring on the inner wall of a cylindrical mold core between the inner wall of the protective cylinder and the inner circle of the pull ring. After the mold core of the inner circle of the pull ring is removed, the pull ring must be forcibly demolded from the grooved ring by the pulling force of the connecting post between the injection molding pull ring and the easy-tear sealing strip. The easy-tear sealing strip is designed to achieve sealing and easy tearing by connecting to the cylinder with a very thin adhesive layer. The existing pull ring requires a slightly larger pulling force during forced demolding. Even a small tear can damage or tear the tear line on the edge of the easy-tear seal, resulting in defective products. Even minor tears can cause leakage when used in liquid packaging containers. To prevent the pull tab from damaging the tear line during forced demolding, the adhesive layer at the edge connecting the seal and the cap needs to be thickened. This makes the seal difficult to remove, and may even cause the pull tab to break, leaving the seal unremovable. Users then have to use other tools to open the seal, which not only affects the user experience but also makes the opening rough and uneven, leading to spillage or leakage when pouring liquid. Sometimes, even fragments of the seal may fall into the container, becoming foreign objects in the food and affecting the user's experience. Therefore, a bottle cap design is needed that can prevent damage from external forces during logistics while allowing for easy demolding during production.

[0020] Reference Figures 1-4 This illustration shows a bottle cap for a liquid packaging container according to an embodiment of the present application. The bottle cap includes an inner cap 10 and an outer cap 50. The inner cap 10 includes a cap top 20 and a cap cylinder 30. The outer cap 50 is detachably connected to the cap cylinder 30. The bottom cylinder opening of the cap cylinder 30 is detachably connected to the packaging container. The outer edge of the cap top 20 is connected to the top cylinder opening of the cap cylinder 30, and the cap top 20 and the top cylinder opening of the cap cylinder 30 are at the same level. The cap top 20 of the inner cap 10 includes an easy-tear sealing piece 21 and a pull ring 22 disposed on the upper surface of the easy-tear sealing piece 21. The pull ring 22 is fixedly connected to the easy-tear sealing piece 21 by a fixing post 23.

[0021] In the embodiments of this application, compared to the prior art, a slightly larger pulling force on the pull ring 22 under the bottle cap during forced demolding will damage or even tear the tear line on the edge of the easy-tear sealing sheet 21, resulting in waste. Even a small tear on the easy-tear line may not be noticed, but it will cause leakage when used on liquid packaging containers. If the adhesive layer of the easy-tear sealing sheet 21 is thickened at the edge of the easy-tear line connecting the easy-tear sealing sheet 21 and the cap is thickened, the easy-tear sealing sheet 21 will be difficult to tear off, and the pull ring 22 may even break, making the easy-tear sealing sheet 21 impossible to remove. Users can only open the easy-tear sealing sheet 21 with other tools. This application provides a solution for placing a pull ring 22 on the top of the inner cover 10. Specifically, the inner cover 10 includes a top cover 20 and a cover cylinder 30. The outer cover 50 is detachably connected to the cover cylinder 30. The bottom opening of the cover cylinder 30 is fixedly connected to the packaging container. The outer edge of the top cover 20 is connected to the top opening of the cover cylinder 30, and the top cover 20 is flush with the top opening of the cover cylinder 30. By raising the top cover 20 to a position flush with the top opening of the cover cylinder 30, the top cover 20 includes an easy-tear sealing sheet 21 and a pull ring 22 disposed on the upper surface of the easy-tear sealing sheet 21. The pull ring 22 is fixedly connected to the easy-tear sealing sheet 21 by a fixing post 23. This solves the problem in the prior art where the pull ring 22 easily tears or even breaks the easy-tear line on the edge of the easy-tear sealing sheet 21 during forced demolding. The deepened protective outer cover 50 can prevent the exposed pull ring 22 on the top of the inner cover 10 from being damaged by external forces during logistics. In the injection mold design, since there is no protective cylinder restricting the outside of the pull ring 22, the pull ring 22 does not need to be forcibly demolded. The pulling force transmitted to the easy-tear seal 21 through the connecting post between the pull ring 22 and the easy-tear seal 21 is very small. This ensures that even if the easy-tear line adhesive layer connecting the cover body and the edge of the easy-tear seal 21 is made relatively thin, the edge of the easy-tear seal 21 can still be prevented from being damaged during demolding. This not only ensures the leakage rate of the liquid packaging container, but also minimizes the pull force of the pull ring 22 and the easy-tear seal 21, thus improving the user experience.

[0022] The following will further describe a bottle cap for a liquid packaging container in this exemplary embodiment.

[0023] In this embodiment of the application, the top 20 of the inner cover 10 includes an easy-tear sealing sheet 21 and a pull ring 22 disposed on the upper surface of the easy-tear sealing sheet 21. The pull ring 22 is fixedly connected to the easy-tear sealing sheet 21 by a fixed post 23.

[0024] It should be noted that the inner wall of the upper sealing cylinder 31 at the connection point first extends a ring plate radially and then connects to the easy-tear sealing piece 21 through a thin, easy-tear adhesive line. The connection method between the inner cap 10 and the outer cap 50 is not limited in this embodiment. The connection method between the outer cap 50 and the inner cap can be threaded connection, compression connection, snap-fit ​​connection, or tamper-evident cap connection, etc. Among these, threaded connection is the most common connection method for bottle caps, which achieves a tight connection by matching the threads on the cap with the threads on the inner cap. This connection method provides good sealing performance. Compression connection refers to a method of achieving a tight connection between the outer cap 50 and the inner cap through an interference fit. Snap-fit ​​connection is a method of connecting the outer cap 50 and the inner cap through a tight fit and by securing them with a snap-fit. This connection method is convenient, quick, has a long service life, and is easy to repeatedly open and close.

[0025] It should be noted that in the injection mold design of this invention, since there is no protective cylinder restricting the outside of the pull ring 22, the pull ring 22 can be embedded in the groove of the inner wall of the same left and right sliders on the outside of the sealing cylinder. During the demolding process, after the mold core of the inner circle of the pull ring 22 is pulled out, the left and right sliders separate to both sides, and the pull ring 22 comes out from the groove ring of the left and right sliders. Since the pull ring 22 does not need to be forcibly demolded, the pulling force transmitted to the easy-tear sealing sheet 21 through the connecting post between the pull ring 22 and the easy-tear sealing sheet 21 is very small. This ensures that even if the easy-tear line adhesive layer connecting the cap body and the edge of the easy-tear sealing sheet 21 is made relatively thin, it is still possible to avoid tearing the easy-tear line at the edge of the easy-tear sealing sheet 21 during demolding. This ensures both the leakage rate of the liquid packaging container and the pull force of the pull ring 22 and the easy-tear sealing sheet 21 is relatively small. When in use, open the outer cap that is in conjunction with the protective cylinder that prevents the pull ring 22 from being damaged by external force, pull the pull ring 22 on the easy-tear sealing strip 21 to tear off the easy-tear sealing strip 21 and take it out so that the liquid can be poured out. The outer cap 50 can then be closed to provide a certain degree of sealing.

[0026] In this embodiment, the cap 30 includes a first upper sealing cylinder 31 and a lower sealing cylinder 32, wherein the first upper sealing cylinder 31 and the lower sealing cylinder 32 are integrally connected. The lower sealing cylinder 32 has at least one sealing ring on its outer or inner wall at the bottom opening, the sealing ring being used to seal the outlet of the liquid packaging container. The lower sealing cylinder 32 also has at least one positioning ring on its outer wall, the positioning ring being used to position the cap at the outlet of the liquid packaging container before filling.

[0027] In this embodiment of the application, the cap 30 includes a second upper sealing cylinder, and the outer or inner wall of the bottom cylinder of the second upper sealing cylinder is provided with at least one sealing ring, which is used to seal the outlet of the liquid packaging container.

[0028] It should be noted that when the inner wall of the inner cover 10 is sealed and assembled with the outer wall of the packaging container outlet, the inner wall of the upper sealing cylinder 31 is provided with one or more sealing rings to form a sealing cover for the packaging container outlet, and the lower sealing cylinder 32 is no longer provided.

[0029] In this embodiment, the outer wall of the first upper sealing cylinder or the outer wall of the second upper sealing cylinder is provided with a retaining ring or buckle that engages with the outer cover 50. The outer wall of the first upper sealing cylinder, the outer wall of the second upper sealing cylinder, or the outer wall of the lower sealing cylinder is provided with a protruding ring or lug for clamping. The outer wall of the first upper sealing cylinder or the outer wall of the second upper sealing cylinder is provided with threads that mate with the outer cover 50.

[0030] It should be noted that the outer cover 50 can be tightly connected to the first upper sealing cylinder 31 or the second upper sealing cylinder to protect the pull ring 22 from damage. The connection method is not limited and can include threaded connection, compression connection, snap-fit ​​connection, and anti-theft cover connection, etc.

[0031] Although preferred embodiments of the present application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present application.

[0032] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0033] The above provides a detailed description of a bottle cap for a liquid packaging container provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A bottle cap for a liquid packaging container, comprising an inner cap and an outer cap, wherein the inner cap includes a cap top and a cap tube, characterized in that, The outer cover is detachably connected to the cover tube, the bottom opening of the cover tube is detachably connected to the packaging container, the outer edge of the top of the cover is connected to the top opening of the cover tube, and the top of the cover is flush with the top opening of the cover tube. The top of the inner cover includes an easy-tear sealing sheet and a pull ring disposed on the upper surface of the easy-tear sealing sheet. The pull ring is fixedly connected to the easy-tear sealing sheet by a fixed column.

2. The bottle cap according to claim 1, characterized in that, The cover cylinder includes a first upper sealing cylinder and a lower sealing cylinder, and the first upper sealing cylinder and the lower sealing cylinder are integrally connected.

3. The bottle cap according to claim 2, characterized in that, The lower sealing cylinder of the cover tube has at least one sealing ring on the outer or inner wall of the bottom cylinder opening, which is used to seal the outlet of the liquid packaging container.

4. The bottle cap according to claim 3, characterized in that, The outer wall of the lower sealing cylinder is provided with at least one positioning ring, which is used to position the bottle cap at the outlet of the liquid packaging container before filling.

5. The bottle cap according to claim 2, characterized in that, The cover cylinder includes a second upper sealing cylinder.

6. The bottle cap according to claim 5, characterized in that, The bottom cylinder of the second upper sealing cylinder has at least one sealing ring on its inner or outer wall, which is used to seal the outlet of the liquid packaging container.

7. The bottle cap according to claim 5, characterized in that, The outer wall of the first upper sealing cylinder or the outer wall of the second upper sealing cylinder is provided with a retaining ring or buckle that engages with the outer cover.

8. The bottle cap according to claim 5, characterized in that, The outer wall of the first upper sealing cylinder, the outer wall of the second upper sealing cylinder, or the outer wall of the lower sealing cylinder is provided with a convex ring or lug for clamping.

9. The bottle cap according to claim 5, characterized in that, The outer wall of the first upper sealing cylinder or the outer wall of the second upper sealing cylinder is provided with threads or buckles that mate with the outer cover.

Images