Aluminum foil composite film and aluminum foil bag

Abstract

The utility model discloses an aluminum foil composite film which comprises a PET film layer and an aluminum foil layer, a first adhesive layer is arranged between the PET film layer and the aluminum foil layer, the aluminum foil composite film further comprises a metallocene modified PE film layer, the thickness of the aluminum foil layer is 7 microns, a second adhesive layer is arranged between the metallocene modified PE film layer and the aluminum foil layer, and the thickness of the second adhesive layer is 7 microns. The metallocene modified PE film layer and the PET film layer are located on the two sides of the aluminum foil layer respectively, the thickness of the PET film layer is larger than that of the aluminum foil layer, and the thickness of the metallocene modified PE film layer is larger than that of the aluminum foil layer. The utility model further discloses an aluminum foil bag prepared from the aluminum foil composite film.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of packaging material especially relates to an aluminum foil composite film and aluminum foil bag. BACKGROUND

[0002] Aluminum foil bag is widely used in the packaging of food, medicine, cosmetics and other products due to its excellent barrier property, good formability and low price. It is widely used in the packaging industry of melon seeds and other nut products. However, in order to ensure the freshness of food, negative pressure environment is often used to detect the quality of aluminum foil bag during use. Due to the insufficient rigidity of aluminum foil, it will cause the aluminum foil bag to appear through cavity, air leakage and other problems, affecting the quality and shelf life of the product. In order to ensure that the aluminum foil bag has good negative pressure resistance, the thickness of the aluminum foil is usually increased from 7um to 9um. Although increasing the thickness of the aluminum foil can improve the negative pressure resistance of the aluminum foil bag, increasing the thickness of the aluminum foil will affect the formability of the aluminum foil bag. SUMMARY

[0003] The utility model discloses a kind of aluminum foil composite films, PET film and metallocene modified PE film are compounded on the two sides of aluminum foil, improve the negative pressure resistance of aluminum foil composite film without increasing the thickness of aluminum foil, ensure that the whole aluminum foil composite film has good sealing property and formability.

[0004] The technical scheme adopted by the utility model is as follows:

[0005] An aluminum foil composite film includes a PET film layer and an aluminum foil layer. A first adhesive layer is arranged between the PET film layer and the aluminum foil layer. The aluminum foil composite film also includes a metallocene modified PE film layer. The thickness of the aluminum foil layer is 7um. A second adhesive layer is arranged between the metallocene modified PE film layer and the aluminum foil layer. The metallocene modified PE film layer and the PET film layer are respectively located on the two sides of the aluminum foil layer. The thickness of the PET film layer is greater than the thickness of the aluminum foil layer. The thickness of the metallocene modified PE film layer is greater than the thickness of the aluminum foil layer.

[0006] In this aluminum foil composite film, the aluminum foil thickness remains at 7 μm, but the heat-sealing PE film layer on one side of the foil utilizes a metallocene-modified PE film. This metallocene-modified PE film is a PE film layer with metallocenes added. PE films with metallocenes exhibit excellent thermal stability, as well as tensile and compressive properties. Therefore, by combining the metallocene-modified PE film layer with the aluminum foil layer, the entire aluminum foil composite film exhibits excellent negative pressure resistance without increasing the thickness of the aluminum foil layer. Ultimately, this ensures that the aluminum foil bags produced using this aluminum foil composite film also exhibit excellent negative pressure resistance. Because the aluminum foil thickness remains unchanged and both the PET film and the metallocene-modified PE film are very flexible, this aluminum foil composite film exhibits excellent formability during bag making. The composite of PET film, aluminum foil, and metallocene PE film in this aluminum foil composite film provides excellent sealing properties.

[0007] In this aluminum foil composite film, the PET film layer is used for printing, and the metallocene-modified PE film layer is used for heat sealing. Therefore, when this aluminum foil is prepared into an aluminum foil bag, the PET film layer is located on the outside of the aluminum foil bag, and the metallocene-modified PE film layer is located on the inside of the aluminum foil bag.

[0008] In this aluminum foil composite film, by compounding PET film and metallocene-modified PE film on both sides of the aluminum foil, the negative pressure resistance of the aluminum foil composite film is improved without increasing the thickness of the aluminum foil, ensuring that the entire aluminum foil composite film has good sealing and formability.

[0009] Optionally, it further includes an ink layer, which is arranged on the PET film layer and located between the PET film layer and the first adhesive layer, and the thickness of the ink layer is 2um to 3um.

[0010] Specifically, the ink layer is a layer formed after the ink is printed on the PET film layer. The ink layer is located between the first adhesive layer and the PET film layer, thereby avoiding exposure of the ink layer and preventing the ink layer from falling off or being scratched.

[0011] Optionally, the thickness of the PET film layer is 8um to 12um.

[0012] Optionally, the thickness of the metallocene-modified PE film layer is 50 μm to 80 μm.

[0013] Optionally, the thickness of the first adhesive layer is 3um to 4um.

[0014] Optionally, the thickness of the second adhesive layer is 3um to 4um.

[0015] Optionally, the matte side of the aluminum foil layer is in contact with the first adhesive layer, and the mirror side of the aluminum foil layer is in contact with the second adhesive layer.

[0016] Specifically, when the aluminum foil composite film is prepared into an aluminum foil bag, the matte side faces outside the bag, while the mirror side faces inside the bag.

[0017] Specifically, the adhesives used in the first adhesive layer and the second adhesive layer are both two-component high-temperature resistant solvent-based polyurethane adhesives.

[0018] An aluminum foil bag comprises the aluminum foil composite film described above.

[0019] Specifically, when the aluminum foil composite film is prepared into an aluminum foil bag, two pieces of aluminum foil composite film are connected together by the heat-sealing bonding effect of the metallocene PE film.

[0020] The beneficial effect of the utility model is that by compounding PET film and metallocene modified PE film on both sides of the aluminum foil, the negative pressure resistance of the aluminum foil composite film is improved without increasing the thickness of the aluminum foil, ensuring that the entire aluminum foil composite film has good sealing and formability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of aluminum foil composite film.

[0022] The reference numerals in the figure are: 1, PET film layer; 2, ink layer; 3, first adhesive layer; 4, aluminum foil layer; 5, second adhesive layer; 6, metallocene-modified PE film. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0024] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0025] Example 1

[0026] As attached Figure 1 As shown, an aluminum foil composite film includes a PET film layer 1 and an aluminum foil layer 4, a first adhesive layer 3 is arranged between the PET film layer 1 and the aluminum foil layer 4, and also includes 6 layers of metallocene-modified PE film. The thickness of the aluminum foil layer 4 is 7 μm. A second adhesive layer 5 is arranged between the 6 layers of metallocene-modified PE film and the aluminum foil layer 4. The 6 layers of metallocene-modified PE film and the PET film layer 1 are respectively located on both sides of the aluminum foil layer 4. The thickness of the PET film layer 1 is greater than the thickness of the aluminum foil layer 4, and the thickness of the metallocene-modified PE film 6 layers is greater than the thickness of the aluminum foil layer 4.

[0027] In this aluminum foil composite film, the thickness of the aluminum foil is still 7 μm, but the PE film layer used for heat sealing on one side of the aluminum foil adopts 6 layers of metallocene-modified PE film. The 6 layers of metallocene-modified PE film are PE film layers with metallocenes added. The PE film layer with metallocenes has good thermal stability and tensile and compressive properties. Therefore, after the 6 layers of metallocene-modified PE film are combined with the 4 layers of aluminum foil, it is possible to ensure that the entire aluminum foil composite film has good negative pressure resistance without increasing the thickness of the aluminum foil layer 4, ultimately ensuring that the aluminum foil bag prepared using this aluminum foil composite film has good negative pressure resistance. Since the thickness of the aluminum foil does not increase, and the PET film and the metallocene-modified PE film 6 are both very soft, this aluminum foil composite film has good formability when making bags. In this aluminum foil composite film, the PET film, aluminum foil and metallocene PE film are combined, so the entire aluminum foil composite film has good sealing properties.

[0028] In this aluminum foil composite film, the PET film layer 1 is used for printing, and the metallocene-modified PE film 6 layers are used for heat sealing. Therefore, when this aluminum foil is prepared into an aluminum foil bag, the PET film layer 1 is located on the outside of the aluminum foil bag, and the metallocene-modified PE film 6 layers are located on the inside of the aluminum foil bag.

[0029] In this aluminum foil composite film, by compounding PET film and metallocene-modified PE film 6 on both sides of the aluminum foil, the negative pressure resistance of the aluminum foil composite film is improved without increasing the thickness of the aluminum foil, ensuring that the entire aluminum foil composite film has good sealing and formability.

[0030] As attached Figure 1 As shown, it also includes an ink layer 2, which is arranged on the PET film layer 1, and the ink layer 2 is located between the PET film layer 1 and the first adhesive layer 3, and the thickness of the ink layer 2 is 2um to 3um.

[0031] Specifically, the ink layer 2 is a layer formed after the ink is printed on the PET film layer 1. The ink layer 2 is located between the first adhesive layer 3 and the PET film layer 1, thereby preventing the ink layer 2 from being exposed and falling off or being scratched.

[0032] As attached Figure 1 As shown, the thickness of the PET film layer 1 is 8um to 12um.

[0033] As attached Figure 1 As shown, the thickness of the 6-layer metallocene-modified PE film is 50 μm to 80 μm.

[0034] As attached Figure 1 As shown, the thickness of the first adhesive layer 3 is 3um to 4um.

[0035] As attached Figure 1 As shown, the thickness of the second adhesive layer 5 is 3um to 4um.

[0036] As shown in the accompanying drawings Figure 1 The matt side of the aluminum foil layer 4 is connected with the first adhesive layer 3, and the mirror side of the aluminum foil layer 4 is connected with the second adhesive layer 5.

[0037] Specifically, when the aluminum foil composite film is prepared into an aluminum foil bag, the matt side faces outward of the bag, and the mirror side faces inward of the bag.

[0038] Specifically, the adhesive used in the first adhesive layer 3 and the second adhesive layer 5 is a two-component high-temperature-resistant solvent-based polyurethane adhesive.

[0039] Example 2

[0040] An aluminum foil bag is prepared by using the aluminum foil composite film shown in Example 1, and when the aluminum foil bag is prepared, two pieces of the aluminum foil composite film shown in Example 1 are connected together by the heat sealing adhesion of the metallocene PE film. The aluminum foil bag can be used to package nuts such as melon seeds.

[0041] The above-described embodiments only express some embodiments of the present application, which are described in more detail and in more detail, but cannot be understood as limiting the scope of the patent of the present application. It should be noted that for those skilled in the art, the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An aluminum foil composite film comprising a PET film layer and an aluminum foil layer, wherein a first adhesive layer is provided between the PET film layer and the aluminum foil layer, characterized in that: It also includes a metallocene-modified PE film layer, the thickness of the aluminum foil layer is 7 μm, a second adhesive layer is provided between the metallocene-modified PE film layer and the aluminum foil layer, the metallocene-modified PE film layer and the PET film layer are respectively located on both sides of the aluminum foil layer, the thickness of the PET film layer is greater than the thickness of the aluminum foil layer, and the thickness of the metallocene-modified PE film layer is greater than the thickness of the aluminum foil layer.

2. The aluminum foil composite film according to claim 1, characterized in that: It also includes an ink layer, which is arranged on the PET film layer and located between the PET film layer and the first adhesive layer. The thickness of the ink layer is 2um to 3um.

3. The aluminum foil composite film according to claim 1, characterized in that: The thickness of the PET film layer is 8um to 12um.

4. The aluminum foil composite film according to claim 1, characterized in that: The thickness of the metallocene-modified PE film layer is 50 μm to 80 μm.

5. The aluminum foil composite film according to claim 1, characterized in that: The thickness of the first adhesive layer is 3um to 4um.

6. The aluminum foil composite film according to claim 1, characterized in that: The thickness of the second adhesive layer is 3um to 4um.

7. The aluminum foil composite film according to claim 1, characterized in that: The matte side of the aluminum foil layer is in contact with the first adhesive layer, and the mirror side of the aluminum foil layer is in contact with the second adhesive layer.

8. An aluminum foil bag, characterized in that: The invention comprises the aluminum foil composite film according to any one of claims 1 to 7.

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