Sealing cover on PET tray

Abstract

The utility model relates to the field of packaging, in particular to a sealing cover on a PET (Polyethylene Terephthalate) tray, which comprises a sealing part used for sealing the PET tray, the sealing part is of a four-layer composite film structure, the first layer is a transparent PET printing film layer, the second layer is a transparent polyvinylidene chloride barrier film layer, the third layer is a transparent polyamide reinforcing film layer, and the fourth layer is a polyethylene heat sealing film layer; the polyethylene heat-sealing film layer is connected with the PET tray, and the sealing part further comprises a handle for easily tearing the sealing cover; the color changing part is an oxygen indicating film and is glued between the transparent polyamide reinforcing film layer and the polyethylene heat sealing film layer; in the using process, the easy tearing performance of the sealing cover is guaranteed, and the sealing performance of a product package can be visually detected.

Description

Technical Field

[0001] The utility model relates to the field of packaging, in particular to a sealing cover on a PET tray. Background Art

[0002] Sealing cover film is a film material used to seal the mouth of a container to protect the contents from contamination or maintain their freshness. Currently on the market, some contents are very susceptible to oxidation reactions that can deteriorate the contents, so merchants use vacuum packaging. However, under certain circumstances, such as during transportation, product packaging may be damaged, destroying the vacuum environment and affecting the quality of the contents. However, consumers cannot intuitively see the changes in oxygen in the container. Therefore, it is urgent to develop a transparent easy-to-tear composite film with oxygen indicator. Utility Model Content

[0003] To this end, the utility model provides a sealing cover on a PET tray, so as to overcome the problem that the transparent easy-tear cover sealed with the PET tray in the prior art cannot directly reflect the sealing performance of the package.

[0004] To achieve the above object, the utility model provides a sealing cover on a PET tray, comprising:

[0005] The sealing part is used to seal the PET tray. The sealing part is a four-layer composite film structure, wherein the first layer is a transparent PET printing film layer, the second layer is a transparent polyvinylidene chloride barrier film layer, the third layer is a transparent polyamide reinforcement film layer, and the fourth layer is a polyethylene heat-sealing film layer; the polyethylene heat-sealing film layer is connected to the PET tray;

[0006] The color changing part is an oxygen indicating film which is glued between the transparent polyamide reinforcing film layer and the polyethylene heat sealing film layer.

[0007] Furthermore, the ratio of the projection area of ​​the color changing portion on the sealing portion to the area of ​​the sealing portion is 3%-8%.

[0008] Furthermore, the transparent PET printing film layer has a thickness of 12um-25um, the transparent polyvinylidene chloride barrier film layer has a thickness of 2.4um-2.6um, the transparent polyamide reinforcement film layer has a thickness of 15um-30um, and the polyethylene heat-sealing film layer has a thickness of 40um-70um.

[0009] Furthermore, the thickness of the color changing portion is 8um-20um.

[0010] Furthermore, the shape of the sealing portion is circular, rectangular, elliptical or irregular.

[0011] Furthermore, the sealing part also includes a handle, which is used to load a tensile force to open the sealing part to complete the sealing, and the membrane structure of the handle is the same as the four-layer composite membrane structure of the sealing part.

[0012] Furthermore, the handle is in the shape of a bar, a semicircle, a triangle, an arc or an irregular shape.

[0013] Furthermore, the ratio of the area of ​​the handle to the area of ​​the sealing portion is 10%-15%.

[0014] Furthermore, a glue point is arranged on the outer side of the transparent PET printed film layer of the handle.

[0015] Furthermore, the ratio of the glue spot area to the handle area is 50%-80%.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] (1) The utility model is provided with a transparent PET printing film layer, a transparent polyvinylidene chloride barrier film layer, a transparent polyamide reinforcement film layer and a polyethylene heat-sealing film layer to form a sealing cover, which plays a good sealing role and prevents the contents from deteriorating.

[0018] (2) A color-changing portion is glued between the transparent polyamide reinforcing film layer and the polyethylene heat-sealing film layer of the sealing portion, which is an oxygen indicator film, and can visually detect the sealing of the package.

[0019] (3) The utility model can also stick the handle of the sealing part on the composite film by dispensing glue, so as to facilitate tearing off the sealing cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a sealing cover on a PET tray according to an embodiment of the utility model;

[0021] Figure 2 This is a schematic diagram of the layered structure of the cross section of the sealing cover on the PET tray of the utility model embodiment;

[0022] In the figure: 1. sealing part; 101. transparent PET printed film layer; 102. transparent polyvinylidene chloride barrier film layer; 103. transparent polyamide reinforcement film layer; 104. polyethylene heat-sealing film layer; 105. handle; 1051. glue dispensing; 2. color changing part. DETAILED DESCRIPTION

[0023] In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, the technical solutions in the embodiments of the utility model are described clearly and completely. Obviously, the embodiments described below are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] It should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the embodiments of the utility model.

[0025] In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0026] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0027] See also Figure 1-2 , which are respectively a schematic diagram of the structure of the sealing cover on the PET tray of the embodiment of the utility model; a schematic diagram of the layered structure of the cross section of the sealing cover on the PET tray of the embodiment of the utility model.

[0028] An embodiment of the utility model provides a sealing cover on a PET tray, comprising:

[0029] The sealing part 1 is used to seal the PET tray. The sealing part 1 is a four-layer composite film structure, wherein the first layer is a transparent PET printing film layer 101, the second layer is a transparent polyvinylidene chloride barrier film layer 102, the third layer is a transparent polyamide reinforcement film layer 103, and the fourth layer is a polyethylene heat-sealing film layer 104; the polyethylene heat-sealing film layer 104 is connected to the PET tray;

[0030] The color changing portion 2 is an oxygen indicating film, which is glued between the transparent polyamide reinforcing film layer 103 and the polyethylene heat-sealing film layer 104 .

[0031] Specifically, the color-changing portion 2 is a film containing a colorimetric redox dye as a base material. It can be understood that the colorimetric redox dye, such as methylene blue, exists in a colorless state in an oxygen-free environment, but in the presence of oxygen, methylene blue will be rapidly oxidized, thereby showing a colored state. When the oxygen concentration is greater than 0.5%, the color-changing portion 2 is blue, when the oxygen concentration is less than 0.1%, the color-changing portion 2 is red, and when the oxygen concentration is between 0.1%-0.5%, the color-changing portion 2 is blood-cyan. Combined with the oxygen permeability of the polyethylene heat-sealing film layer 104, after the PET tray is sealed, if the sealing portion is damaged, when the oxygen outside the package enters the PET tray, the color-changing portion can quickly change color, thereby indicating that the package is damaged.

[0032] Specifically, the ratio of the projection area of ​​the color changing portion 2 on the sealing portion 1 to the area of ​​the sealing portion 1 is 3%-8%.

[0033] Specifically, the transparent PET printing film layer 101 has a thickness of 12um-25um, the transparent polyvinylidene chloride barrier film layer 102 has a thickness of 2.4um-2.6um, the transparent polyamide reinforcement film layer 103 has a thickness of 15um-30um, and the polyethylene heat-sealing film layer 104 has a thickness of 40um-70um.

[0034] Specifically, the thickness of the color changing portion 2 is 8um-20um.

[0035] Specifically, the shape of the color changing portion 2 can be circular, rectangular or irregular.

[0036] Specifically, the shape of the sealing portion 1 is circular, rectangular, elliptical or irregular, and there is no specific limitation thereto, as long as it meets the product requirements.

[0037] Specifically, the sealing part 1 further comprises a handle 105 , which is used to load a tensile force to open the sealing part 1 after sealing. The membrane structure of the handle 105 is the same as the four-layer composite membrane structure of the sealing part 1 .

[0038] Specifically, the pulling force for tearing off the sealing portion 1 can be 43N-46N, which is not specifically limited and only needs to be sufficient to tear off the sealing cover.

[0039] Specifically, the shape of the handle 105 is a bar, a semicircle, a triangle, an arc or an irregular shape, and there is no specific limitation on the shape, as long as it meets the product requirements.

[0040] Specifically, the ratio of the area of ​​the handle 105 to the sealing portion 1 is 10%-15%.

[0041] Specifically, a glue point 1051 is provided on the outer side of the transparent PET printed film layer 101 of the handle 105 .

[0042] Specifically, the handle 105 can be reversely bent from the edge of the sealing portion 1 to the upper surface of the transparent PET printed film layer 101, and there is no specific limitation thereto, and it only needs to meet the needs of users.

[0043] Specifically, the thickness of the glue 1051 can be 10um-20um, and there is no specific limitation, as long as it meets the needs of users.

[0044] Specifically, the ratio of the area of ​​the glue spot 1051 to the area of ​​the handle 105 is 50%-80%.

[0045] For those skilled in the art, according to the concept of the embodiments of the utility model, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the utility model.

Claims

1. A sealing cover on a PET tray, characterized in that: include: The sealing part is used to seal the PET tray. The sealing part is a four-layer composite film structure, wherein the first layer is a transparent PET printing film layer, the second layer is a transparent polyvinylidene chloride barrier film layer, the third layer is a transparent polyamide reinforcement film layer, and the fourth layer is a polyethylene heat-sealing film layer; the polyethylene heat-sealing film layer is connected to the PET tray; The color changing part is an oxygen indicating film which is glued between the transparent polyamide reinforcing film layer and the polyethylene heat sealing film layer.

2. The sealing cover on the PET tray according to claim 1, characterized in that: The ratio of the projection area of ​​the color changing portion on the sealing portion to the area of ​​the sealing portion is 3%-8%.

3. The sealing cover on the PET tray according to claim 2, characterized in that: The thickness of the transparent PET printing film layer is 12um-25um, the thickness of the transparent polyvinylidene chloride barrier film layer is 2.4um-2.6um, the thickness of the transparent polyamide reinforcement film layer is 15um-30um, and the thickness of the polyethylene heat-sealing film layer is 40um-70um.

4. The sealing cover on the PET tray according to claim 3, characterized in that: The thickness of the color changing portion is 8um-20um.

5. The sealing cover on the PET tray according to claim 4, characterized in that: The shape of the sealing portion is circular, rectangular, elliptical or irregular.

6. The sealing cover on the PET tray according to claim 5, characterized in that: The sealing part also includes a handle, which is used to load a pulling force to open the sealing part to complete the sealing. The membrane structure of the handle is the same as the four-layer composite membrane structure of the sealing part.

7. The sealing cover on the PET tray according to claim 6, characterized in that: The handle is in the shape of a bar, a semicircle, a triangle, an arc or an irregular shape.

8. The sealing cover on the PET tray according to claim 7, characterized in that: The ratio of the area of ​​the handle to the area of ​​the sealing portion is 10%-15%.

9. The sealing cover on the PET tray according to claim 8, characterized in that: The transparent PET printed film layer of the handle is provided with glue on the outer side.

10. The sealing cover on the PET tray according to claim 9, characterized in that: The ratio of the glue spot area to the handle area is 50%-80%.

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