Environment-friendly recyclable PET (polyethylene terephthalate) high-temperature cooking film

Abstract

The utility model discloses an environment-friendly recoverable PET (polyethylene terephthalate) high-temperature cooking film, which comprises an inner-layer co-extrusion film, a composite film and a first bonding layer, the inner-layer co-extrusion film comprises a heat sealing layer and at least one co-extrusion layer, the co-extrusion layer is a PET film, and the co-extrusion layer is connected with the composite film through the first bonding layer. The finished product packaging film prepared by the utility model can be recycled, and meanwhile, the finished product packaging film prepared by the utility model can be applied to a high-temperature cooking sterilization condition, a semi-high-temperature cooking sterilization condition, a water cooking sterilization condition or a common environment. The cooking film prepared by the utility model has the advantages of high-temperature cooking and recoverable single material at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of food packaging, in particular to an environmentally friendly and recyclable PET high-temperature cooking film. Background Art

[0002] The commonly used material structure of high-temperature cooking composite film generally includes a PET outer layer, an AL or NY middle layer, and an RCPP inner layer, in order to meet the purpose of high-temperature cooking requirements through the composite of different materials. Since the structure of conventional high-temperature cooking composite films contains a variety of different types of materials, the packaging is difficult to classify and recycle, and it cannot meet environmental protection requirements. Therefore, it has always been difficult to solve the problem of single-material recycling of high-temperature cooking products from a technical perspective. The problem that needs to be solved in this case is how to take into account both the conditions of high-temperature cooking and the recycling of a single material. Utility Model Content

[0003] The purpose of the utility model is to overcome the defects existing in the prior art and provide an environmentally friendly and recyclable PET high-temperature cooking film, which can effectively solve the above-mentioned problems existing in the prior art.

[0004] In order to achieve the above purpose, the technical solution of the utility model is to provide

[0005] An environmentally friendly and recyclable PET high-temperature cooking film comprises an inner co-extruded film, wherein the inner co-extruded film comprises a heat sealing layer and at least one co-extruded layer, and the co-extruded layer is a PET film.

[0006] Furthermore, it also includes a composite film and a first adhesive layer, and the co-extruded layer and the composite film are connected via the first adhesive layer.

[0007] Furthermore, the composite film includes 1-5 PET layers and a second adhesive layer, and the PET layers in the composite film are connected by the second adhesive layer.

[0008] Furthermore, it may include at least one interlayer, and the interlayer may be arranged between the heat-sealing layer and the co-extruded layer or between the co-extruded layers.

[0009] Furthermore, it may include at least one interlayer, and the interlayer may be arranged on the side of the composite film facing the co-extruded layer;

[0010] Or the interlayer may be arranged on the side of the co-extruded layer facing the composite film;

[0011] Or it is arranged between the layers in the composite film.

[0012] Or it is arranged on the outer surface layer of the composite film.

[0013] The interlayer is composited with other layers via an adhesive layer.

[0014] Furthermore, the interlayer may be made of one of EVOH, PA, PE, PP, PET or AL.

[0015] Furthermore, the thickness of the interlayer is 1-40 μm.

[0016] Furthermore, it also includes a coating, which is applied to at least one of the bonded surface of the inner co-extruded film, the inner surface of the composite film or the outer surface of the composite film, at least one of the upper and lower ends of any PET film, and at least one of the upper and lower ends of any interlayer;

[0017] The coating is at least one or more of a high barrier coating, a high temperature resistant layer, a surface protection layer and an ink layer; the high barrier coating is selected from at least one of EVOH, PVOH, PVDC, alumina and silicon oxide.

[0018] The ink layer is generally printed on the outer surface of the composite film or between the composite films, that is, it can be on the PET layer or on the interlayer.

[0019] Furthermore, the heat sealing layer is one of PET, PP or PE;

[0020] The heat sealing layer is PET, and the thickness of the co-extrusion layer accounts for 80% or more;

[0021] The heat sealing layer is PP, and the thickness of the co-extrusion layer accounts for 60% or more;

[0022] The heat sealing layer is PE, and the thickness of the co-extrusion layer accounts for 60% or more;

[0023] Furthermore, the co-extrusion layer is provided with 1-8 layers.

[0024] Furthermore, the thickness of the high temperature cooking film is greater than 20 μm.

[0025] Furthermore, the thickness of the inner co-extruded film is 10-120 μm, the thickness of the heat-sealing layer is 2-30 μm, and the thickness of the co-extruded layer is 0-78 μm.

[0026] Furthermore, the thickness of the composite film is 8-140 μm.

[0027] Furthermore, the thickness of the first adhesive layer and the second adhesive layer are both 1-5 μm.

[0028] Furthermore, the coating has a thickness of 0.01-10 μm.

[0029] The advantages and beneficial effects of the utility model are:

[0030] (1) The finished packaging film prepared by the utility model can be recycled, meeting the requirements of 4.3.3 in GB / T18455.

[0031] (2) The finished packaging film prepared by the utility model can be used under high-temperature steaming sterilization conditions (121-145°C), semi-high-temperature steaming sterilization (100-121°C), water boiling sterilization (80C-100°C) or ordinary environment (below 80°C).

[0032] (3) The cooking film prepared by the utility model can have the advantages of high-temperature cooking and single-material recyclability. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic structural diagram of an environmentally friendly and recyclable PET high-temperature cooking film described in the utility model;

[0034] Inner co-extruded film 1, heat sealing layer 11, co-extruded layer 12, composite film 2, PET layer 21, second adhesive layer 22, first adhesive layer 3, coating layer 4. DETAILED DESCRIPTION

[0035] The following is a further description of the specific implementation of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0036] like Figure 1 As shown, an environmentally friendly and recyclable PET high-temperature cooking film includes an inner co-extruded film 1, wherein the inner co-extruded film 1 includes a heat sealing layer 11 and at least one co-extruded layer 12, wherein the co-extruded layer 12 is a PET film.

[0037] As a preferred embodiment of the above technical solution, it further comprises a composite film 2 and a first adhesive layer 3 , and the co-extruded layer 12 is connected to the composite film 2 via the first adhesive layer 3 .

[0038] As a preferred embodiment of the above technical solution, the composite film 2 includes 1-5 PET layers 21 and a second adhesive layer 22 , and the PET layers 21 in the composite film 2 are connected by the second adhesive layer 22 .

[0039] As a preferred embodiment of the above technical solution, it may include at least one interlayer, and the interlayer may be arranged between the heat sealing layer and the co-extruded layer or between the co-extruded layers.

[0040] As a preferred embodiment of the above technical solution, it may include at least one interlayer, and the interlayer may be arranged on the side of the composite film 2 facing the co-extruded layer;

[0041] Or the interlayer may be provided on the side of the co-extruded layer 12 facing the composite film 2;

[0042] Or it is arranged between the layers in the composite membrane 2.

[0043] Or it is provided on the outer surface layer of the composite film 2.

[0044] The interlayer is composited with other layers via an adhesive layer.

[0045] As a preferred embodiment of the above technical solution, the interlayer can be made of one of EVOH, PA, PE, PP, PET or AL; and the thickness of the interlayer is 1-40 μm.

[0046] As a preferred embodiment of the above technical solution, it also includes a coating 4, which is coated on the bonded surface of the inner co-extruded film 1, at least one of the inner surface of the composite film 2 or the outer surface of the composite film 2, at least one of the upper and lower ends of any PET film 21, and at least one of the upper and lower ends of any interlayer;

[0047] The coating 4 is at least one or more of a high barrier coating, a high temperature resistant layer, a surface protection layer and an ink layer; the high barrier coating is selected from at least one of EVOH, PVOH, PVDC, alumina and silicon oxide.

[0048] The ink layer is generally printed on the outer surface of the composite film 2 or between the composite films 2, that is, it can be on the PET layer 21 or on the interlayer.

[0049] As a preferred embodiment of the above technical solution, the heat sealing layer 11 is one of PET, PP or PE;

[0050] The heat sealing layer 11 is PET, and the co-extrusion layer thickness accounts for 80% or more;

[0051] The heat sealing layer 11 is PP, and the thickness of the co-extruded layer accounts for 60% or more;

[0052] The heat sealing layer 11 is PE, and the co-extrusion layer thickness accounts for 60% or more;

[0053] As a preferred embodiment of the above technical solution, the co-extrusion layer 12 is provided with 1-8 layers.

[0054] As a preferred embodiment of the above technical solution, the thickness of the high temperature cooking film is greater than 20 μm.

[0055] As a preferred embodiment of the above technical solution, the thickness of the inner co-extruded film 1 is 10-120 μm, the thickness of the heat sealing layer 11 is 2-30 μm, and the thickness of the co-extruded layer 12 is 0-78 μm.

[0056] As a preferred embodiment of the above technical solution, the thickness of the composite film 2 is 8-140 μm, and the thickness of the PET layer 21 is 8-40 μm.

[0057] As a preferred embodiment of the above technical solution, the thickness of the first adhesive layer 3 and the second adhesive layer 22 are both 1-5 μm.

[0058] As a preferred embodiment of the above technical solution, the thickness of the coating 4 is 0.01-10 μm.

[0059] (I) High temperature cooking film preparation

[0060] Embodiment 1:

[0061] like Figure 1 As shown, an environmentally friendly and recyclable PET high-temperature cooking film includes an inner co-extruded film 1, a composite film 2 and a first adhesive layer 3. The inner co-extruded film 1 includes a heat sealing layer 11 and two co-extruded layers 12. The co-extruded layer 12 is connected to the composite film 2 through the first adhesive layer 3.

[0062] The heat sealing layer 11 is PET, and the co-extrusion layer 12 is a PET film.

[0063] The composite film 2 includes two PET layers 21 and a second adhesive layer 22 . The PET layers 21 in the composite film 2 are connected by the second adhesive layer 22 .

[0064] It also includes an ink layer 4, which is coated on the bonded surface of the inner co-extruded film 1 and has a thickness of 3 μm.

[0065] The thickness of the high temperature cooking film is 102 μm.

[0066] The thickness of the inner co-extruded film 1 is 50 μm, of which the thickness of the heat-sealing layer 11 is 10 μm, and the thickness of the two co-extruded layers 12 are both 20 μm.

[0067] The composite film 2 has a thickness of 45 μm, wherein the two PET layers 21 have thicknesses of 18 and 23 μm respectively, and the second adhesive layer 22 has a thickness of 4 μm.

[0068] The thickness of the first adhesive layer 3 is 4 μm.

[0069] The first adhesive layer 3 and the second adhesive layer 22 are both made of Henkel UK3640.

[0070] Comparative Example:

[0071] The conventional PET high temperature cooking film PET12 / INK / AL7 / NY15 / RCPP70 is used as a comparative example, which includes an inner layer of cast PP inner film for high temperature cooking, a composite film AL layer, a composite film NY layer, a composite film PET layer and an adhesive layer for high temperature cooking between each layer.

[0072] The invention also comprises an ink layer, wherein the ink layer is coated on the bonded surface of the outer PET composite film.

[0073] The thickness of the high temperature cooking film is 120 μm.

[0074] The thickness of the adhesive layer is 4 μm.

[0075] The adhesive layers are all made of Henkel UK3640.

[0076] (II) Performance parameters

[0077] The bag body prepared in Example 1 was subjected to performance testing, and the testing standards and conditions were as follows:

[0078] (1) Recyclable: in accordance with 4.3.3 of GB / T 18455;

[0079] (2) High temperature resistance: According to Class 3 in GB / T 10004;

[0080]

[0081] The total PET content of the finished packaging film prepared in Example 1 can reach more than 90%, so that the packaging film can be recycled and meets the requirements of 4.3.3 in GB / T 18455. The finished packaging film prepared in Example 1 can meet the application under high temperature steam sterilization conditions (121-145°C), semi-high temperature steam sterilization (100-121°C), water boiling sterilization (80°C-100°C) or ordinary environment (below 80°C).

[0082] Although the cooking film prepared in the comparative example can meet the requirements for high-temperature cooking, its structure contains four kinds of film materials (different materials contribute different performances and are difficult to replace), which does not meet the requirements for recycling and is not environmentally friendly and recyclable. Compared with the comparative example, Example 1 can also meet the requirements for high-temperature cooking, and the proportion of PET in the structure can be as high as 92%, which meets the requirements for recycling and is environmentally friendly and recyclable.

[0083] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An environmentally friendly and recyclable PET high-temperature cooking film, characterized in that: The invention comprises an inner co-extruded film (1), wherein the inner co-extruded film (1) comprises a heat-sealing layer (11) and at least one co-extruded layer (12), wherein the co-extruded layer (12) is a PET film, and the heat-sealing layer (11) is one of PET, PP or PE.

2. The environmentally friendly and recyclable PET high-temperature cooking film according to claim 1, characterized in that: It also comprises a composite film (2) and a first adhesive layer (3), wherein the co-extruded layer (12) is connected to the composite film (2) via the first adhesive layer (3).

3. The environmentally friendly and recyclable PET high-temperature cooking film according to claim 2, characterized in that: The composite film (2) comprises 1 to 5 PET layers (21) and a second adhesive layer (22), and the PET layers (21) in the composite film (2) are connected via the second adhesive layer (22).

4. The environmentally friendly and recyclable PET high-temperature cooking film according to claim 1, characterized in that: It comprises at least one interlayer, which is arranged between the heat-sealing layer (11) and the co-extruded layer (12); or between the co-extruded layers (12).

5. The environmentally friendly and recyclable PET high-temperature cooking film according to claim 3, characterized in that: It comprises at least one interlayer, which is arranged on the side of the composite film (2) facing the co-extruded layer; Or the interlayer may be arranged on the side of the co-extruded layer (12) facing the composite film (2); or disposed between the layers of the composite film (2); Or it is arranged on the outer surface layer of the composite membrane (2).

6. The environmentally friendly and recyclable PET high-temperature cooking film according to claim 4 or 5, characterized in that: The interlayer is one of EVOH, PA, PE, PP, PET or AL; and the thickness of the interlayer is 1-40 μm.

7. The environmentally friendly and recyclable PET high-temperature cooking film according to claim 2, characterized in that: It also includes a coating (4), which is applied to the bonded surface of the inner co-extruded film (1), at least one of the inner surface of the composite film (2) or the outer surface of the composite film (2), at least one of the upper and lower ends of any PET layer (21), and at least one of the upper and lower ends of any interlayer.

8. The environmentally friendly and recyclable PET high-temperature cooking film according to claim 1, characterized in that: The heat sealing layer (11) is PET, and the thickness of the co-extruded layer accounts for 80% or more; or The heat sealing layer (11) is PP, and the thickness of the co-extruded layer accounts for 60% or more; or The heat sealing layer (11) is PE, and the thickness of the co-extrusion layer accounts for 60% or more.

9. The environmentally friendly and recyclable PET high-temperature cooking film according to claim 1, characterized in that: The co-extrusion layer (12) is provided with 1 to 8 layers.

10. The environmentally friendly and recyclable PET high-temperature cooking film according to claim 1, characterized in that: The thickness of the high temperature cooking film is greater than 20 μm.

11. The environmentally friendly and recyclable PET high-temperature cooking film according to claim 1, characterized in that: The thickness of the inner co-extruded film (1) is 10-120 μm, the thickness of the heat-sealing layer (11) is 2-30 μm, and the thickness of the co-extruded layer (12) is 0-78 μm.

12. The environmentally friendly and recyclable PET high-temperature cooking film according to claim 3, characterized in that: The thickness of the composite film (2) is 8-140 μm, and the thickness of the PET layer (21) is 6-40 μm.

13. The environmentally friendly and recyclable PET high-temperature cooking film according to claim 3, characterized in that: The thickness of the first adhesive layer (3) and the second adhesive layer (22) are both 1-5 μm.

14. The environmentally friendly and recyclable PET high-temperature cooking film according to claim 7, characterized in that: The thickness of the coating (4) is 0.01-10 μm.

Images