A cover film structure and a milk powder can

Abstract

The utility model relates to packing article technical field discloses a lid film structure and milk powder jar. Lid film structure includes: film main part is provided with annular cut -out, covers and seals the film, and is hot -seal formed with film main part, the edge of covering and sealing the film forms the corresponding tear -off section of a kind of with annular cut -out, the starting end of tear -off section extends to the direction away from annular cut -out and is separatedly arranged with film main part. Film main part is provided with annular cut -out, and the edge of covering and sealing the film forms the corresponding tear -off section of a kind of with annular cut -out, this annular opening structure, ingeniously utilizes the force moment amplification, the force dispersion transmission and the force characteristic of single -hand operation, is easy to operate while saving, fundamentally solves the problem that lid film force is difficult, force is unstable and cannot be operated by single hand.

Description

Technical Field

[0001] This utility model relates to the field of packaging materials technology, specifically to a lid structure and a milk powder can. Background Technology

[0002] For the sake of sealing and safety, the lids of milk powder on the market require a lot of force to tear or lift. In addition, the aluminum foil pull ring is located too far in or the tear is strongly adhesive, which further increases the difficulty of opening. This is especially true for mothers who are taking care of their babies alone, as they sometimes need to operate with one hand. It is difficult to exert a steady force with one hand to open the lid, which causes inconvenience to users. Utility Model Content

[0003] In view of this, the present invention provides a lid structure and a milk powder can to solve the problem that the lid requires a large force to tear or lift, making it difficult to operate with one hand.

[0004] In a first aspect, this utility model provides a cover membrane structure, comprising: The membrane body has an annular slit. A sealing film is heat-sealed to the film body; the edge of the sealing film has a tear-off portion corresponding to the annular cut, and the starting end of the tear-off portion extends away from the annular cut and is disposed separately from the film body.

[0005] Beneficial effects: The membrane body is provided with an annular slit, and the edge of the sealing membrane forms a tear-off part corresponding to the annular slit. This annular opening structure cleverly utilizes the torque amplification, force dispersion and transmission and the force exertion characteristics of single-handed operation. It saves effort and facilitates single-handed operation, fundamentally solving the problems of difficulty in exerting force and unstable force application in existing membrane coverings, which make single-handed operation impossible.

[0006] In one alternative embodiment, the membrane body is made of aluminum film and / or PE film.

[0007] Beneficial effects: Aluminum foil has high barrier properties (oxygen barrier, water barrier, light barrier), preventing the deterioration of the sealed material; moreover, aluminum foil is suitable for heat sealing and is not easily deformed. PE film has good heat-sealing properties, easily seals with cover materials, and provides a reliable seal; PE film is impact-resistant, has good toughness, is not easily broken, and is also relatively inexpensive, and can be made into transparent film. The combined use of aluminum foil and PE film combines the advantages of both.

[0008] In one alternative embodiment, the sealing film is at least one of aluminum film, PET film and PE film or any combination thereof.

[0009] Beneficial effects: Aluminum foil has high barrier properties, preventing oxidation, moisture absorption, and deterioration of the sealed material; it is also suitable for heat sealing and is not easily deformed. PE film has good heat-sealing properties, easily seals with capping materials, and provides a reliable seal; PE film is impact-resistant, tough, and not easily broken, and is also relatively inexpensive, and can be made into transparent film. PET film has good mechanical strength and stiffness, and also possesses oxygen- and water-barrier properties, which can delay the spoilage of milk powder. The aluminum-PET and PE composite structure, combining the stiffness of PET, the barrier properties of aluminum foil, and the heat-sealing properties of PE, achieves the best sealing and protection effect.

[0010] In one alternative embodiment, the tearing portion forms a larger than semicircular ring segment.

[0011] Beneficial effects: In terms of tearing stability, the tearing part forms a superior ring segment larger than a semicircle, with a long tearing path, large angle, and even force distribution, making it less likely to break or deviate midway, and ensuring high smoothness of opening; moreover, the large gripping area and dispersed force points make it easy to exert force even with wet hands, making it suitable for one-handed operation.

[0012] In one alternative embodiment, the tearing portion includes a tearing body located between its starting end and its ending end, the width of the starting end being greater than the width of the tearing body.

[0013] Beneficial effects: By adopting a method where the width of the starting end of the tearing section is greater than the width of the tearing body, the ease of gripping and operation is improved, and it is easy to position. Compared with the pull ring, the tearing trajectory is easier to control, and it is less likely to deviate or break midway. Moreover, the structure is simple, flat and concise.

[0014] In one alternative embodiment, the sealing film is die-cut to form the tear-off portion.

[0015] Beneficial effects: Simple structure, no need for additional pull rings and riveting processes, high production efficiency; reduced mold and material costs due to fewer parts and assembly steps; and a flat appearance that does not take up extra space.

[0016] In one alternative embodiment, a pattern indicator layer is provided on the tear-off portion.

[0017] Beneficial effects: The pattern indicator layer indicates the opening position and the direction of force application, making it easier for users to identify and operate, and further improving convenience.

[0018] Secondly, this utility model also provides a milk powder can, comprising: The tank body has an opening at the top; The capping membrane structure described in any of the above embodiments is disposed at the can opening.

[0019] Beneficial effects: Since the milk powder can includes the lid film structure of this utility model, it has the same technical effects as the lid film structure, which will not be described in detail here.

[0020] In one alternative embodiment, a rim is provided at the can opening, and the cover membrane structure is installed on the rim.

[0021] Beneficial effect: A rim protruding towards the center of the tank is provided on the inner wall of the tank near the center, which facilitates the installation and opening of the cover structure.

[0022] In one alternative embodiment, the outer contour shape of the cover structure is adapted to the cross-sectional shape of the milk powder can.

[0023] Beneficial effects: The outer contour of the lid structure is adapted to the cross-sectional shape of the milk powder can, and the lid structure can be opened along the edge of the can opening to expose the can opening, making it convenient to take out the milk powder. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this utility model, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a top view of a cover membrane structure according to an embodiment of the present utility model; Figure 2 for Figure 1 The diagram shows the state of the cover film structure during the opening process of the tear-off section. Figure 3 This is a bottom view of a membrane structure according to an embodiment of the present utility model; Figure 4 This is a structural diagram of a membrane body material in its wound state according to an embodiment of the present invention; Figure 5 This is a structural diagram of a sealing film material in its wound state according to an embodiment of the present invention.

[0026] Explanation of reference numerals in the attached figures: 1. Membrane body; 11. Circular incision; 2. Sealing film; 21. Tear section; 211. Starting point. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] In the description of this utility model, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship 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," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this utility model, it should also 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 fixed 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] The following is combined Figures 1 to 5 The following describes embodiments of the present invention.

[0031] According to an embodiment of the present invention, in one aspect, a cover membrane structure is provided, comprising: The membrane body 1 has an annular slit 11. The sealing film 2 is heat-sealed with the film body 1; the edge of the sealing film 2 is formed with a tear-off portion 21 corresponding to the annular cut 11, and the starting end 211 of the tear-off portion 21 extends away from the annular cut 11 and is disposed separately from the film body 1.

[0032] An annular slit 11 is provided on the membrane body 1, and a tear-off part 21 corresponding to the annular slit 11 is formed on the edge of the sealing membrane 2. This annular opening structure cleverly utilizes the torque amplification, force dispersion and transmission and the force exertion characteristics of single-handed operation, saving effort and facilitating single-handed operation, fundamentally solving the problems of difficult force exertion and unstable force application in covering the membrane, making single-handed operation impossible.

[0033] The following analysis, based on mechanical principles, explains why the ring-shaped opening structure can be operated with one hand: First, the opening force is amplified by utilizing torque, reducing the actual force required. The core problem with related cap films (such as the center pull ring type) is the short lever arm. The key advantage of the ring structure lies in extending the lever arm (the distance from the point of application to the center of rotation) and amplifying the torque, allowing a small amount of force from one hand to produce a sufficient opening and sealing effect. In related technologies, the point of application of force on the cap film is extremely close to the edge of the can opening (center of rotation), and the lever arm is typically only 1-2 cm, requiring a large force to achieve the opening torque. However, the point of application of force on the ring film is distributed along the ring edge, significantly increasing the distance from the point of application to the center of the can opening (center of rotation). The lever arm can reach the radius of the can opening (e.g., 5-8 cm), which is 3-5 times that of pull ring structures. The required force is only 1 / 5 to 1 / 3 of the original, allowing for easy one-handed application to overcome sealing resistance and achieve labor-saving results.

[0034] Secondly, force transmission and dispersion: The ring structure makes single-handed force application more stable, avoiding insufficient local force. In related technologies, the force point of the lid film (such as a single-sided tear) is concentrated in a single location. If the angle of force applied by a single hand is off or the force is uneven, problems such as localized failure to tear or lid film breakage can easily occur. However, the ring structure achieves uniform force transmission and dispersion through the ring-shaped force-bearing ring, adapting to the asymmetrical force characteristics of single-handed application. The force point changes from a single point to a continuous ring of points. When applying force with one hand, the force is transmitted to the entire easy-tear line through the ring structure, causing the lid film to detach from the can opening synchronously along the ring trajectory, avoiding the situation in traditional structures where a single point of force is too great and other parts are not separated. The essence of one-handed operation is to simultaneously fix the can body and open the lid film with one hand. Because it is easy to tear, the thumb and index finger (or middle finger) hold the ring pull tab and apply force along the tangent of the ring. At this time, the direction of the force is perpendicular to the axis of the can body, maximizing the lever arm. There is no need to use the other hand to fix the can body. The lever arm direction of the ring structure is perfectly matched with the one-handed grip posture. When applying force, there will be no loss of force due to the shaking of the can body, achieving stable force application.

[0035] Secondly, rotational torque replaces peeling force, reducing reliance on finger grip strength and adapting to single-handed operation habits. In related technologies, opening the cap film is essentially a vertical peel, requiring fingers to pinch the pull ring and pull upwards against the adhesive force between the cap film and the can opening. This relies on finger grip strength and upward pulling force, easily leading to slippage or insufficient strength when pulling with one hand. In contrast, opening the annular cap film is essentially a rotational pry – when applying force with one hand, the tearing part 21 causes the cap film to rotate circumferentially along the can opening, converting the vertical peeling force into rotational torque. This rotational action is more in line with single-handed operation habits, similar to twisting a bottle cap, eliminating the need for fingers to bear strong vertical pulling force. The protrusion height of the annular pull tab is typically designed to be 2-3mm, allowing fingers to easily grip it and preventing slippage, further reducing the difficulty of single-handed operation.

[0036] Therefore, the annular cover membrane solves the problem of saving effort by extending the lever arm to amplify the torque, and solves the problem of stable force application by one hand by distributing the force in an annular shape. Ultimately, it achieves one-handed operation without sacrificing sealing performance.

[0037] During the production of the cover film structure, the cover film is first punched with a semi-circular hole in the cover film 2 (upper film) and then die-cut according to the printed pattern to complete the entire easy-tear ring, i.e. the tear-off part 21. Then, the film body 1 (lower film) is die-cut to ensure that it is attached to the cover film 2. The first heat seal is performed (on the inner side of the die-cut film body 1). Then, the waste edge of the outer ring of the die-cut film body 1 that has not been heat-sealed is pulled out. Then, the second heat seal is performed to completely heat seal the cover film 2 and the film body 1. Finally, the whole thing is die-cut into shape.

[0038] This new type of milk powder cap film is easy to tear and can be easily operated with one hand. It tears cleanly and neatly without any debris or residue on the edge of the can opening.

[0039] It should be noted that the lid of this utility model is designed primarily from the aspects of sealing, safety, and ease of one-handed operation. In terms of sealing, it must isolate oxygen to prevent oxygen from the air from seeping into the can and causing oxidation of the milk powder, loss of nutrients (such as vitamins and unsaturated fatty acids), and changes in flavor and spoilage; it must isolate moisture to prevent water vapor from entering the can and causing the milk powder to clump and breed microorganisms (bacteria and mold); it must also isolate odors and light to prevent the intrusion of odors from the external environment and block light (especially ultraviolet radiation) to avoid degradation of photosensitive components (such as vitamins) and flavor deterioration in the milk powder. The aluminum foil layer is highly effective in these aspects.

[0040] In terms of food safety and hygiene, all materials used in the lid (plastic film, aluminum foil, ink, adhesive) must comply with strict food contact material regulations to ensure that harmful substances will not migrate and contaminate the milk powder; the production and sealing process of the lid must be carried out in a highly clean environment to minimize the risk of microbial contamination.

[0041] In some embodiments, the membrane body 1 is made of aluminum film and / or PE film.

[0042] Aluminum foil possesses high barrier properties (oxygen, water, and light blocking), preventing the deterioration of the sealed material; moreover, aluminum foil is suitable for heat sealing and is not easily deformed. PE film has good heat-sealing properties, easily seals with cover materials, and provides a reliable seal; PE film is impact-resistant, tough, and not easily broken, and is also relatively inexpensive, and can be made into a transparent film. The combined use of aluminum and PE films combines the advantages of both.

[0043] In some embodiments, the sealing film 2 is at least one of aluminum film, PET film and PE film or any combination thereof.

[0044] Aluminum foil offers high barrier properties, preventing oxidation, moisture absorption, and deterioration of the sealed material. It is also suitable for heat sealing and is not easily deformed. PE film has excellent heat-sealing properties, easily seals with capping materials, and provides a reliable seal. PE film is impact-resistant, tough, and not easily broken, and it is also relatively inexpensive and can be made into a transparent film. PET film has good mechanical strength and stiffness, and it also possesses oxygen and water barrier properties, which can delay the spoilage of milk powder. The aluminum-PET and PE composite structure combines the stiffness of PET, the barrier properties of aluminum foil, and the heat-sealing properties of PE to achieve optimal sealing and protection.

[0045] PET (Polyethylene Terephthalate) is a common thermoplastic polyester material. PE (Polyethylene) is polyethylene.

[0046] It should be noted that the membrane body 1 and the sealing membrane 2 of the cover membrane structure are heat-sealed together after die-cutting, and then die-cut into shape again.

[0047] In terms of user convenience, the design features an easy-tear line for convenient opening, catering to consumers and mothers who may need to operate with one hand. Under normal circumstances, the tear should be clean and neat, avoiding the formation of fragments or residue around the rim of the can.

[0048] In some embodiments, the tear-off portion 21 forms a larger than semicircular ring segment.

[0049] In terms of tearing stability, the tearing part 21 forms a superior ring segment larger than a semicircle, with a long tearing path, large angle, and uniform force distribution, making it less prone to breakage or deviation midway and ensuring high smoothness of opening; moreover, the large gripping area and dispersed force points make it easy to exert force even with wet hands, making it suitable for one-handed opening operation.

[0050] In some embodiments, the tearing portion 21 includes a tearing body located between its starting end 211 and its ending end, wherein the width of the starting end 211 is greater than the width of the tearing body.

[0051] By adopting a method where the width of the starting end 211 of the tearing part 21 is greater than the width of the tearing body, the ease of gripping and operation is improved, and it is easy to position. Compared with the pull ring, the tearing trajectory is easier to control, and it is less likely to deviate or break midway. Moreover, the structure is simple, flat and concise.

[0052] In some embodiments, the sealing film 2 is die-cut to form a tear-off portion 21.

[0053] With its simple structure, it requires no additional pull rings or riveting processes, resulting in high production efficiency. It also reduces mold and material costs by minimizing parts and assembly steps. Furthermore, it has a flat appearance and does not take up extra space.

[0054] In some embodiments, a pattern indicator layer is provided on the tear-off portion 21.

[0055] A pattern indicator layer is set up to indicate the opening position and the direction of force application, making it easier for users to identify and operate, and further improving convenience.

[0056] According to an embodiment of the present invention, another aspect provides a milk powder can, comprising: The tank body has an opening at the top; A membrane structure is installed at the tank opening.

[0057] Since the milk powder can includes the lid film structure of this utility model, it has the same technical effect as the lid film structure, which will not be described in detail here.

[0058] In some embodiments, a rim is provided at the mouth of the can, and a cover membrane structure is installed on the rim.

[0059] A rim protruding towards the center of the tank is provided on the inner wall of the tank near the center to facilitate the installation and opening of the cover structure.

[0060] In some embodiments, the outer contour shape of the lid structure is adapted to the cross-sectional shape of the milk powder can.

[0061] The outer contour of the lid structure is adapted to the cross-sectional shape of the milk powder can, and the lid structure can be opened along the edge of the can opening to expose the entire can opening, making it convenient to take out the milk powder.

[0062] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by this application.

Claims

1. A mulch film structure characterised in that, include: The membrane body (1) is provided with an annular slit (11); A sealing film (2) is heat-sealed with the film body (1); the edge of the sealing film (2) is formed with a tear-off portion (21) corresponding to the annular cut (11), and the starting end (211) of the tear-off portion (21) extends away from the annular cut (11) and is disposed separately from the film body (1).

2. The mulch film structure of claim 1, wherein, The membrane body (1) is made of aluminum film and / or PE film.

3. The mulch film structure of claim 1, wherein, The sealing film (2) is at least one of aluminum film, PET film and PE film or any combination thereof.

4. The mulch film structure according to any one of claims 1 to 3, wherein, The tearing portion (21) forms a larger than semicircular ring segment.

5. The mulch film structure of claim 1, wherein The tearing section (21) includes a tearing body located between its starting end (211) and its ending end, the width of the starting end (211) being greater than the width of the tearing body.

6. The mulch film structure of claim 1, wherein The sealing film (2) is die-cut to form the tear-off portion (21).

7. The mulch film structure of claim 1, wherein A pattern indicator layer is provided on the tear-off section (21).

8. A milk powder tank characterized by comprising: include: The tank body has an opening at the top; The capping structure according to any one of claims 1 to 7, wherein the capping structure is disposed at the can opening.

9. The milk powder tank according to claim 8, characterized in that A rim is provided at the mouth of the can, and the cover membrane structure is installed on the rim.

10. The powdered milk tank according to claim 8, characterized in that, The outer contour shape of the lid structure is adapted to the cross-sectional shape of the milk powder can.

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