Cover film capable of being repeatedly opened

Abstract

The utility model relates to the technical field of cover films, and discloses a cover film capable of being repeatedly opened, which is used for sealing a container and comprises a protective layer and a repeated sticking layer, the repeated sticking layer comprises an outer film layer, an easy-to-uncover middle film layer and a positioning film layer used for being fixedly connected with the container, the side, away from the easy-to-uncover middle film layer, of the outer film layer is connected with the protective layer, and the positioning film layer is provided with an opening communicated with the interior of the container in a matched mode; wherein the easy-to-tear middle film layer is movably adhered to the positioning film layer so as to movably seal the container. In this way, food which cannot be used up at a time can be stored conveniently. The food in the container is prevented from being stained when being placed outdoors, and the food placed in the refrigerator is prevented from being tainted by odor, so that the practicability is effectively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of cover films, and in particular relates to a cover film that can be opened repeatedly. Background Art

[0002] In recent years, with the development of economy, people's disposable income has increased year by year, material life has been enriched, and the food industry, which is closely related to people's life, has also developed rapidly. Every step forward of the food industry has put forward new requirements for food packaging. As early as the early 1990s, with the rapid development of Western fast food and convenience food, the packaging form of plastic containers as the bottom and top sealing flexible packaging cover material has been widely used in developed countries such as Europe and the United States. This kind of packaging does not require additional containers, is easy to open, easy to carry, safe and hygienic, and is very suitable for busy people to use. After its launch, it has been widely welcomed by people.

[0003] In my country's food packaging market, plastic containers with sealing films have been launched to cater to the fast pace of life. For example, jelly packaging has received more and more attention due to its small size, good shelf effect, high safety and hygiene performance, and convenient use.

[0004] However, when people use the container, they may not finish the food in it. The general sealing film is made of polyamide film, aluminum foil or paper. These sealing films have a common characteristic: they cannot be re-adhered after being torn, which is not conducive to the preservation of food that cannot be finished at one time. The food in the container is easily contaminated when placed outdoors and easily tainted when placed in the refrigerator. Therefore, the practicality is low. Utility Model Content

[0005] In order to solve the deficiencies of the prior art, the utility model provides a cover film that can be opened repeatedly.

[0006] The technical effects to be achieved by the utility model are achieved through the following technical aspects:

[0007] A re-openable cover film, used for sealing a container, comprises: a protective layer and a re-adhesive layer;

[0008] The repeatedly adhesive layer comprises an outer film layer, an easy-to-peel middle film layer and a positioning film layer for being firmly connected to the container, which are sequentially stacked, wherein the outer film layer is connected to the protective layer on one side away from the easy-to-peel middle film layer, and the positioning film layer has an opening that is in communication with the inside of the container;

[0009] Wherein, the easy-to-peel middle film layer is movably bonded to the positioning film layer to movably seal the container.

[0010] In some embodiments, the strength value required for the initial tearing of the easy-to-peel middle film layer and the positioning film layer is 8N / 15mm-15N / 15mm.

[0011] In some embodiments, when the easy-to-peel intermediate film layer and the positioning film layer are torn apart for the second to tenth time, the strength required for tearing is reduced by 1N / 15mm to 2N / 15mm each time.

[0012] In some embodiments, the strength value required for the easy-to-peel middle film layer and the positioning film layer to be torn apart for the tenth time is 2N / 15mm to 3N / 15mm.

[0013] In some embodiments, the outer edge of the easy-to-peel intermediate film layer protrudes and is disposed on the outer surface of the positioning film layer.

[0014] In some embodiments, the thickness of the positioning film layer and the thickness of the easy-to-peel middle film layer are greater than the thickness of the outer film layer.

[0015] In some embodiments, the repeated-adhesion layer is configured as a three-layer co-extruded functional polyethylene film layer, and the densities of the outer film layer, the easy-to-peel middle film layer and the positioning film layer gradually decrease.

[0016] In some embodiments, the protective layer includes a protective film layer and a barrier film layer stacked in sequence, and the barrier film layer is connected to the outer film layer.

[0017] In some embodiments, the protective film layer is configured as a polyethylene terephthalate film layer, a polyethylene terephthalate film layer formed by coating with silicon oxide, or a polyethylene terephthalate film layer formed by coating with aluminum oxide.

[0018] In some embodiments, the barrier film layer is configured as an aluminum foil film or a nylon film layer.

[0019] In summary, the utility model has at least the following benefits:

[0020] The utility model provides a reusable cover film. When the protective layer, the outer film layer, the easy-to-remove middle film layer and the positioning film layer are connected, the protective layer, the outer film layer and the easy-to-remove middle film layer close the opening. When packaging, the reusable cover film is heat-sealed to the container. At this time, the positioning film layer is connected to the edge of the container, and the protective layer, the outer film layer and the easy-to-remove middle film layer close the container mouth. When the consumer uses it, an external force is applied to the reusable cover film. At this time, because the positioning film layer is tightly connected to the edge of the container, after being subjected to the external force, the positioning film layer is still fixed to the edge of the container, and the positioning film layer and the easy-to-remove middle film layer are movably bonded. Therefore, the two layers of material will be separated by the external force, that is, the external force peels off the film layer formed by the easy-to-remove middle film layer, the outer film layer and the protective layer, thereby peeling off the cup body. When the peeled film layer is covered back along the torn sealing area, the easy-to-remove middle film layer and the positioning film layer are bonded together again, so that the container mouth can be sealed again. In this way, it is convenient to store food that cannot be used up at one time. It prevents the food in the container from being contaminated when placed outdoors, and prevents the food placed in the refrigerator from tainting the food, thereby effectively improving the practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of the connection between the re-openable cover film and the container according to an embodiment of the present application;

[0022] Figure 2 This is a schematic diagram of the overall structure of the reusable cover film and the container in a torn state in an embodiment of the present application;

[0023] Figure 3 It is a schematic diagram of the partial cross-sectional structure of the cover film that can be opened repeatedly.

[0024] Markings in the figure:

[0025] 10. The cover film can be opened repeatedly;

[0026] 100, protective layer; 110, protective film layer; 120, barrier film layer;

[0027] 200, repeated sticking layer; 210, outer film layer; 220, easy-to-remove middle film layer; 230, positioning film layer;

[0028] 20. Container. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. The described implementation is a part of the implementation of the utility model, not all of the implementations.

[0030] Therefore, 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0031] Embodiment 1:

[0032] like Figures 1 to 3 As shown, in this embodiment, a reusable cover film 10 is used to seal a container 20, including: a protective layer 100 and a reusable adhesive layer 200; the reusable adhesive layer 200 includes an outer film layer 210, an easy-to-peel middle film layer 220 and a positioning film layer 230 for being firmly connected to the container 20, which are stacked in sequence, and the outer film layer 210 is connected to the protective layer 100 on one side away from the easy-to-peel middle film layer 220, and the positioning film layer 230 has an opening that is cooperatively connected to the inside of the container 20; wherein the easy-to-peel middle film layer 220 and the positioning film layer 230 are movably bonded to movably seal the container 20.

[0033] Specifically, the edge of the container 20 is connected to the re-openable cover film 10 to seal the container 20. The protective layer 100 is arranged on the outside to provide barrier protection for the container 20; the re-adhesive layer 200 is connected to the container 20, and the re-adhesive layer 200 relies on a heat-sealing mold to seal the container 20 at high temperature, and the outer film layer 210 and the easy-to-remove intermediate film layer 220 are the same size and shape as the protective layer 100, so that the protective layer 100, the outer film layer 210 and the easy-to-remove intermediate film layer 220 are tightly connected and the container 20 mouth is sealed; the positioning film layer 230 has the same size and shape as the edge of the container 20, and is firmly attached to the edge of the container 20. Through the movable attachment of the positioning film layer 230 and the outer film layer 210, the container 20 is movably sealed, and the food in the container 20 can be taken out from the opening of the positioning film layer 230. Among them, the protective layer 100, the outer film layer 210, the easy-to-peel middle film layer 220 and the positioning film layer 230 are bonded in sequence, and the bonding strength between the easy-to-peel middle film layer 220 and the positioning film layer 230 is smaller than the bonding strength between the easy-to-peel middle film layer 220 and the outer film layer 210, and smaller than the bonding strength between the positioning film layer 230 and the edge of the container 20.

[0034] It is worth noting that when the protective layer 100, the outer film layer 210, the easy-to-peel middle film layer 220 are connected to the positioning film layer 230, the protective layer 100, the outer film layer 210 and the easy-to-peel middle film layer 220 seal the opening. When packaging, the re-openable cover film 10 is heat-sealed to the container 20. At this time, the positioning film layer 230 is cooperatively connected to the edge of the container 20, and the protective layer 100, the outer film layer 210 and the easy-to-peel middle film layer 220 seal the opening of the container 20. When consumers use it, external force is applied to the re-openable cover film 10. At this time, because the positioning film layer 230 is tightly connected to the edge of the container 20, after being subjected to the external force, the positioning film layer 230 is still fixed at the edge of the container 20, and the adhesion strength between the positioning film layer 230 and the easy-to-remove intermediate film layer 220 is low. Therefore, the two layers of material will be separated by the external force, that is, the external force peels off the film layer formed by the easy-to-remove intermediate film layer 220, the outer film layer 210 and the protective layer 100, thereby opening the cup body. When the peeled film layer is covered back along the torn sealing area, the easy-to-remove intermediate film layer 220 relies on its strong adhesion to bond with the positioning film layer 230 again, so that the container 20 mouth can be closed again. In this way, it is convenient to store food that cannot be used up at one time. It prevents the food in the container 20 from being contaminated when placed outdoors, and prevents the food placed in the refrigerator from tainting, thereby effectively improving the practicality.

[0035] Embodiment 2:

[0036] In order to ensure the use of the cover film 10 that can be repeatedly opened, in some embodiments, the strength value required for the initial tearing of the easy-to-peel middle film layer 220 and the positioning film layer 230 is 8N / 15mm-15N / 15mm.

[0037] Specifically, the strength value required for the easy-to-peel middle film layer 220 and the positioning film layer 230 to tear apart is set according to actual production needs. For example, the strength value required for the easy-to-peel middle film layer 220 and the positioning film layer 230 to tear apart initially is 8N / 15mm; for another example, the strength value required for the easy-to-peel middle film layer 220 and the positioning film layer 230 to tear apart initially is 12N / 15mm; for another example, the strength value required for the easy-to-peel middle film layer 220 and the positioning film layer 230 to tear apart initially is 15N / 15mm.

[0038] To ensure the use of the cover film 10 that can be repeatedly opened, in some embodiments, the strength required for tearing the easy-to-peel intermediate film layer 220 and the positioning film layer 230 is reduced from the second tearing to the tenth tearing by 1N / 15mm to 2N / 15mm each time.

[0039] Specifically, the strength value required for tearing the easy-to-peel intermediate film layer 220 and the positioning film layer 230 is set according to actual production needs. For example, when the easy-to-peel intermediate film layer 220 and the positioning film layer 230 are torn for the second time to the tenth time, the strength value required for tearing is reduced by 1N / 15mm each time; for another example, when the easy-to-peel intermediate film layer 220 and the positioning film layer 230 are torn for the second time to the tenth time, the strength value required for tearing is reduced by 1.5N / 15mm each time. For another example, when the easy-to-peel intermediate film layer 220 and the positioning film layer 230 are torn for the second time to the tenth time, the strength value required for tearing is reduced by 2N / 15mm each time.

[0040] In order to ensure the use of the cover film 10 that can be repeatedly opened, in some embodiments, the strength value required for the easy-to-peel middle film layer 220 and the positioning film layer 230 to be torn apart for the tenth time is 2N / 15mm to 3N / 15mm.

[0041] Specifically, the strength value required for tearing the easy-to-peel intermediate film layer 220 and the positioning film layer 230 apart is set according to actual production needs. For example, the strength value required for tearing the easy-to-peel intermediate film layer 220 and the positioning film layer 230 apart for the tenth time is 2N / 15mm; for another example, the strength value required for tearing the easy-to-peel intermediate film layer 220 and the positioning film layer 230 apart for the tenth time is 2.5N / 15mm; for another example, the strength value required for tearing the easy-to-peel intermediate film layer 220 and the positioning film layer 230 apart for the tenth time is 3N / 15mm.

[0042] In order to facilitate the tearing of the easy-to-peel intermediate film layer 220, as Figure 2 As shown, in some embodiments, the outer edge of the easy-to-release middle film layer 220 protrudes from the outer surface of the positioning film layer 230 .

[0043] Specifically, the width of the easy-to-peel middle film layer 220 is greater than the width of the positioning film layer 230 , so that it is convenient for consumers to apply external force to the easy-to-peel middle film layer 220 alone, thereby tearing the film layers.

[0044] In another embodiment, there is a gap between the easy-to-peel middle film layer 220 and the positioning film layer 230 , so that the consumer can peel off the easy-to-peel middle film layer 220 through the gap.

[0045] In order to prevent the easy-to-peel middle film layer 220 and the positioning film layer 230 from being easily broken, in some embodiments, the thickness of the positioning film layer 230 and the thickness of the easy-to-peel middle film layer 220 are greater than the thickness of the outer film layer 210 .

[0046] Specifically, by setting the thickness of the easy-to-peel middle film layer 220 and the positioning film layer 230 to be larger, the easy-to-peel middle film layer 220 and the positioning film layer 230 are prevented from being easily broken during use, thereby increasing the practicality of the reusable cover film 10 .

[0047] In order to facilitate the adhesion of the easy-to-peel middle film layer 220 and the positioning film layer 230, in some embodiments, the repeated adhesive layer 200 is set as a three-layer co-extruded functional polyethylene film layer, and the density of the outer film layer 210, the easy-to-peel middle film layer 220 and the positioning film layer 230 gradually decreases.

[0048] Specifically, the outer film layer 210 is set as a high-density polyethylene film layer, the easy-to-peel intermediate film layer 220 is set as a medium-density polyethylene film layer, and the positioning film layer 230 is set as a linear low-density polyethylene film layer. The bonding strength between the medium-density polyethylene film layer and the linear low-density polyethylene film layer is low, and the medium-density polyethylene film layer has a strong adhesive force due to its resin itself, and can be flexibly bonded to the positioning film layer 230. In this way, the easy-to-peel intermediate film layer 220 and the positioning film layer 230 are easily bonded.

[0049] Embodiment 3:

[0050] In order to facilitate the use of the reusable cover film 10 , in some embodiments, the protective layer 100 includes a protective film layer 110 and a barrier film layer 120 stacked in sequence, and the barrier film layer 120 is connected to the outer film layer 210 .

[0051] Specifically, by configuring the protection layer 100 as the barrier film layer 120 and the protective film layer 110 , a barrier and protective effect can be achieved, thereby effectively increasing the practicality of the reusable cover film 10 .

[0052] To facilitate the use of the protective film layer 110 , in some embodiments, the protective film layer 110 is configured as a polyethylene terephthalate film layer, a polyethylene terephthalate film layer formed by coating with silicon oxide, or a polyethylene terephthalate film layer formed by coating with aluminum oxide.

[0053] Specifically, the specific configuration of the protective film layer 110 is configured according to actual production needs. For example, the protective film layer 110 is configured as a conventional polyethylene terephthalate film layer; for another example, the protective film layer 110 is configured as a polyethylene terephthalate film layer formed by coating with silicon oxide; for another example, the protective film layer 110 is configured as a polyethylene terephthalate film layer formed by coating with aluminum oxide.

[0054] In order to facilitate the use of the barrier film layer 120 , in some embodiments, the barrier film layer 120 is configured as an aluminum foil film or a nylon film layer.

[0055] Specifically, the barrier film layer 120 is specifically configured according to actual production requirements. For example, the barrier film layer 120 is configured as an aluminum foil film; for another example, the barrier film layer 120 is configured as a nylon film layer.

[0056] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0058] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0059] In the present utility model, unless otherwise clearly specified and limited, the first feature being above or below the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0060] Although the utility model is described in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and changes based on the above content. Therefore, all such substitutions, improvements and changes are included in the spirit and scope of the appended claims.

Claims

1. A re-openable cover film for sealing a container (20), characterized in that: include: A protective layer (100) and a repeated adhesive layer (200); The repeatedly adhesive layer (200) comprises an outer film layer (210), an easy-to-peel middle film layer (220), and a positioning film layer (230) which are sequentially stacked and arranged, the outer film layer (210) is connected to the protective layer (100) on a side facing away from the easy-to-peel middle film layer (220), and the positioning film layer (230) has an opening which is in communication with the interior of the container (20); The easily removable intermediate film layer (220) is movably bonded to the positioning film layer (230) to movably seal the container (20).

2. The re-openable cover film according to claim 1, characterized in that: The strength value required for the initial tearing of the easy-to-peel intermediate film layer (220) and the positioning film layer (230) is 8N / 15mm to 15N / 15mm.

3. The re-openable cover film according to claim 1, characterized in that: When the easy-to-peel intermediate film layer (220) and the positioning film layer (230) are torn apart for the second to tenth time, the strength value required for tearing is reduced by 1N / 15mm to 2N / 15mm each time.

4. The re-openable cover film according to claim 1, characterized in that: The strength value required for the easy-to-peel intermediate film layer (220) and the positioning film layer (230) to be torn apart for the tenth time is 2N / 15mm to 3N / 15mm.

5. The re-openable cover film according to claim 1, characterized in that: The outer edge of the easy-to-remove intermediate film layer (220) protrudes and is arranged on the outer surface of the positioning film layer (230).

6. The re-openable cover film according to claim 1, characterized in that: The thickness of the positioning film layer (230) and the thickness of the easy-to-remove intermediate film layer (220) are greater than the thickness of the outer film layer (210).

7. The re-openable cover film according to claim 1, characterized in that: The repeated adhesive layer (200) is configured as a three-layer co-extruded functional polyethylene film layer, and the densities of the outer film layer (210), the easy-to-peel middle film layer (220) and the positioning film layer (230) gradually decrease.

8. The re-openable cover film according to claim 1, characterized in that: The protective layer (100) comprises a protective film layer (110) and a barrier film layer (120) stacked in sequence, and the barrier film layer (120) is connected to the outer film layer (210).

9. The re-openable cover film according to claim 8, characterized in that: The protective film layer (110) is configured as a polyethylene terephthalate film layer, a polyethylene terephthalate film layer formed by silicon oxide coating, or a polyethylene terephthalate film layer formed by aluminum oxide coating.

10. The re-openable cover film according to claim 8, characterized in that: The barrier film layer (120) is configured as an aluminum foil film or a nylon film layer.

Images