Easily-torn PET / VMCPP composite film and preparation method thereof

Abstract

The invention relates to a PET / VMCPP composite film easy to tear. The PET / VMCPP composite film comprises a PET printing film layer, the VMCPP thin film layer is stacked on the PET printing film layer, the VMCPP thin film layer comprises a corona layer, a middle layer and a heat sealing layer which are sequentially stacked from bottom to top, the corona layer comprises terpolymer polypropylene granules FL7322 of TPC, and the middle layer comprises co-polypropylene granules ZHP12J of Zhongpetrochemical industry. According to the PET / VMCPP composite film, the adhesive force of the corona layer in the VMCPP film layer is enhanced, so that the stripping force of the PET / VMCPP composite film is more excellent, and the Elmendorf tearing force and the elongation at break of the PET / VMCPP composite film are lower, so that the tearing force of the whole composite film is lower, the easy-to-tear property of the composite film is enhanced, and the experience feeling of consumers is stronger.

Description

Technical Field

[0001] The present invention belongs to the technical field of packaging materials, and more specifically, relates to an easily tearable PET / VMCPP composite film and a preparation method thereof. Background Art

[0002] The 12PET / 30VMCPP composite film products widely circulated in the market are made of 12μm thick polyethylene terephthalate (PET) and 30μm thick vacuum aluminum cast polypropylene film (VMCPP) tightly combined. This structure gives the packaging material excellent barrier properties, transparency and beautiful decorative effects. However, despite the significant performance advantages of this composite film, consumers often encounter the problem of poor tearing effect during use.

[0003] Specifically, when consumers try to open products packaged in such composite films, they often find that the packaging is difficult to tear open smoothly and requires extra effort or the use of tools. This inconvenience not only reduces the consumer experience, but may also lead to doubts about product quality, which in turn has a negative impact on the customer's brand value.

[0004] Therefore, it is very important to develop an easy-to-tear PET / VMCPP composite film. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention aims to provide an easy-to-tear PET / VMCPP composite film and a preparation method thereof. The present invention improves the tearability of the PET / VMCPP aluminized composite film by improving the formula of the VMCPP film layer.

[0006] In order to solve the above technical problems or achieve the above objectives, the present invention adopts the following technical solutions:

[0007] According to one aspect of the present invention, an easily tearable PET / VMCPP composite film comprises:

[0008] PET printed film layer;

[0009] A VMCPP film layer is stacked on top of the PET printed film layer. The VMCPP film layer includes a corona layer, an intermediate layer and a heat-sealing layer which are stacked in sequence from bottom to top, wherein the corona layer contains TPC's ternary copolymer polypropylene granules FL7322, and the intermediate layer contains Sinopec's copolymer polypropylene granules ZHP12J.

[0010] In one embodiment of the present invention, the corona layer is made of FL7322 with a content of 100%.

[0011] In one embodiment of the present invention, the corona layer further comprises random copolymer polypropylene pellets RD265 from Borouge Chemicals.

[0012] In one embodiment of the present invention, the corona layer is made of 80% FL7322 and 20% RD265.

[0013] In one embodiment of the present invention, the middle layer is made of ZHP12J with a content of 100%.

[0014] In one embodiment of the present invention, the middle layer further comprises random copolymer polypropylene pellets RD265 produced by Borouge Chemicals.

[0015] In one embodiment of the present invention, the middle layer is made of 80% ZHP12J and 20% RD265.

[0016] In one embodiment of the present invention, the heat seal layer is made of terpolymer polypropylene pellets FL7642 with a TPC content of 100%.

[0017] In one embodiment of the present invention, the terpolymer polypropylene pellets FL7322 are terpolymer products of propylene, ethylene and butene.

[0018] According to another aspect of the present invention, there is provided a method for preparing the above-mentioned easy-to-tear PET / VMCPP composite film, comprising:

[0019] Performing printing operation on PET to obtain PET printed film;

[0020] The CPP resin is subjected to a casting operation to obtain a CPP base film;

[0021] Under vacuum conditions, an aluminum plating operation is performed on the surface of the CPP base film to obtain an easy-to-tear VMCPP film;

[0022] The VMCPP film and the PET printed film were dry-laminated to obtain an easily tearable PET / VMCPP composite film.

[0023] The technical solution provided by the present invention has the following advantages compared with the prior art:

[0024] The present invention strengthens the adhesion of the corona layer in the VMCPP film layer, so that the peeling force of the PET / VMCPP composite film is better, and the PET / VMCPP composite film of the present invention has a lower Elmendorf tear force and a lower elongation at break, thereby making the tearing force of the overall composite film lower and enhancing the tearability of the composite film, thereby making consumers have a stronger experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the description of the embodiments or the prior art are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 A structural cross-sectional view of an easily tearable PET / VMCPP composite film provided by an embodiment of the present invention is shown;

[0028] Figure 2 Shows Figure 1 Schematic diagram of the process for preparing an easy-to-tear PET / VMCPP composite film.

[0029] Among them, 1. PET printing film layer; 2. corona layer; 3. middle layer; 4. heat sealing layer; 5. VMCPP film layer. DETAILED DESCRIPTION

[0030] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the embodiments of the present invention will be further described below. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0032] like Figure 1 As shown, an embodiment of the present invention provides an easy-to-tear PET / VMCPP composite film, including a PET printed film layer 1 and a VMCPP film layer 5 stacked on the PET printed film layer 1, the VMCPP film layer 5 includes a corona layer 2, an intermediate layer 3 and a heat-sealing layer 4 stacked in sequence from bottom to top, wherein the corona layer 2 may include ternary copolymer polypropylene pellets FL7322 of TPC (The Polyolefin Company (Singapore) Pte Ltd, Singapore Polyolefin Private Limited), the intermediate layer 3 may include copolymer polypropylene pellets ZHP12J of Sinopec, and the heat-sealing layer 4 uses ternary copolymer polypropylene pellets FL7642 of TPC.

[0033] The present invention strengthens the adhesion of the corona layer in the VMCPP film layer, so that the peeling force of the PET / VMCPP composite film is better, and the PET / VMCPP composite film of the present invention has a lower Elmendorf tear force and a lower elongation at break, thereby making the tearing force of the overall composite film lower and enhancing the tearability of the composite film, thereby making consumers have a stronger experience.

[0034] In the structure shown in the above embodiment, preferably, the corona layer 2 can be made entirely of FL7322, i.e., 100% of FL7322. Alternatively, the corona layer 2 also contains random copolymer polypropylene granules RD265 of Borouge Chemicals, whereby the corona layer 2 can be made by mixing 80% of FL7322 and 20% of RD265.

[0035] In the structure shown in the above embodiment, preferably, the middle layer 3 can be made entirely of ZHP12J, that is, made of ZHP12J with a content of 100%. Alternatively, the middle layer 3 also contains random copolymer polypropylene pellets RD265 of Borouge Chemicals, so that the middle layer 3 can be made by mixing ZHP12J with a content of 80% and RD265 with a content of 20%.

[0036] In the structure shown in the above embodiment, preferably, the heat-sealing layer 4 is made entirely of FL7642, that is, made of FL7642 with a content of 100%.

[0037] In the structures shown in the above examples, the terpolymer polypropylene pellets FL7322 are terpolymer products of propylene, ethylene and butene.

[0038] like Figure 2 As shown, the present invention also provides a method for preparing the above-mentioned easy-to-tear PET / VMCPP composite film, comprising:

[0039] Performing printing operation on PET to obtain PET printed film;

[0040] The CPP resin is subjected to a casting operation to obtain a CPP base film;

[0041] Under vacuum conditions, an aluminum plating operation is performed on the surface of the CPP base film to obtain an easy-to-tear VMCPP film;

[0042] The VMCPP film and the PET printed film were dry-laminated to obtain an easily tearable PET / VMCPP composite film.

[0043] The above technical solution of the present invention is described in detail below through specific embodiments.

[0044] The present invention improves the tearability of the PET / VMCPP composite film mainly by improving the formula of the VMCPP film layer 5 in the PET / VMCPP composite film (mainly improving the material or components of the corona layer 2 and the intermediate layer 3).

[0045] Specifically, the improved design of the VMCPP film layer 5 formulation is as follows:

[0046] The corona layer 2 in the VMCPP film layer 5 may include propylene-ethylene-butene TPC terpolymer polypropylene pellets FL7322, which can obtain better aluminum layer adhesion after aluminum plating, and better peeling force after compounding with PET printed film. In addition, alternatively, the corona layer 2 may further include Borouge Chemical's random copolymer polypropylene pellets RD265.

[0047] The middle layer 3 in the VMCPP film layer 5 may include Sinopec's copolymerized polypropylene pellets ZHP12J, which has a lower elongation at break, making the film's tearing force lower and easier to tear. In addition, the middle layer 3 may further include Borouge Chemical's random copolymerized polypropylene pellets RD265.

[0048] The heat sealing layer 4 in the VMCPP film layer 5 can be completely made of TPC's terpolymer polypropylene pellets FL7642.

[0049] Example 1

[0050] like Figure 1 As shown, an easy-to-tear PET / VMCPP composite film comprises a PET printed film layer 1 and a VMCPP film layer 5 stacked on the PET printed film layer 1, wherein the VMCPP film layer 5 comprises a corona layer 2, an intermediate layer 3 and a heat sealing layer 4 stacked from bottom to top, as shown in Table 1, in this embodiment 1, the corona layer 2 is made of FL7322 with a content of 100% and a thickness of 5 μm, the intermediate layer 3 is made of ZHP12J with a content of 100% and a thickness of 20 μm, and the heat sealing layer 4 is made of FL7642 with a content of 100% and a thickness of 10 μm.

[0051] The PET / VMCPP composite film in Example 1 is Figure 2 Prepared by the method shown.

[0052] The PET / VMCPP composite film in Example 1 was subjected to performance tests such as Elmendorf tear force, elongation at break and peel force. The results are shown in Table 2 below.

[0053] Example 2

[0054] like Figure 1As shown, an easy-to-tear PET / VMCPP composite film comprises a PET printed film layer 1 and a VMCPP film layer 5 stacked on the PET printed film layer 1, wherein the VMCPP film layer 5 comprises a corona layer 2, an intermediate layer 3 and a heat sealing layer 4 stacked from bottom to top. As shown in Table 1, in this embodiment 2, the corona layer 2 is made of 80% FL7322 and 20% RD265, with a thickness of 5 μm, the intermediate layer 3 is made of 100% ZHP12J, with a thickness of 20 μm, and the heat sealing layer 4 is made of 100% FL7642, with a thickness of 10 μm.

[0055] The PET / VMCPP composite film in Example 2 is Figure 2 Prepared by the method shown.

[0056] The PET / VMCPP composite film in Example 2 was subjected to performance tests such as Elmendorf tear force, elongation at break and peel force. The results are shown in Table 2 below.

[0057] Example 3

[0058] like Figure 1 As shown, an easy-to-tear PET / VMCPP composite film comprises a PET printed film layer 1 and a VMCPP film layer 5 stacked on the PET printed film layer 1, wherein the VMCPP film layer 5 comprises a corona layer 2, an intermediate layer 3 and a heat sealing layer 4 stacked from bottom to top. As shown in Table 1, in this embodiment 3, the corona layer 2 is made of 100% FL7322 and has a thickness of 5 μm, the intermediate layer 3 is made of 80% ZHP12J and 20% RD265 and has a thickness of 20 μm, and the heat sealing layer 4 is made of 100% FL7642 and has a thickness of 10 μm.

[0059] The PET / VMCPP composite film in Example 3 adopts Figure 2 Prepared by the method shown.

[0060] The PET / VMCPP composite film in Example 3 was subjected to performance tests such as Elmendorf tear force, elongation at break and peel force. The results are shown in Table 2 below.

[0061] Comparative Example

[0062] A VMCPP aluminum-plated composite film comprises a PET printed film layer and a VMCPP film layer stacked on the PET printed film layer, wherein the VMCPP film layer comprises a corona layer, an intermediate layer and a heat sealing layer stacked from bottom to top, as shown in Table 1, the corona layer is made of RD265 with a content of 100% and a thickness of 5 μm, the intermediate layer is made of RD265 with a content of 100% and a thickness of 20 μm, and the heat sealing layer is made of FL7642 with a content of 100% and a thickness of 10 μm.

[0063] The PET / VMCPP composite film in this comparative example was subjected to performance tests such as Elmendorf tear force, elongation at break and peel force. The results are shown in Table 2 below.

[0064] Table 1: Composition and thickness of the corona layer, intermediate layer and heat seal layer of the VMCPP film layer in Examples 1-3 and Comparative Examples

[0065]

[0066]

[0067] Table 2: Performance test of PET / VMCPP composite films in Examples 1-3 and Comparative Examples

[0068]

[0069] TD: transverse direction; MD: longitudinal direction

[0070] It can be seen from Table 1 and Table 2 above that, compared with the comparative example, the PET / VMCPP composite films of Examples 1-3 of the present invention have better peeling force, lower Elmendorf tear force, and lower elongation at break, thereby making the tearing force of the overall composite film of the present invention lower and enhancing the tearability of the composite film.

[0071] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusions, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to the process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including a..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0072] The foregoing is merely an embodiment of the present invention, which enables those skilled in the art to understand and implement the present invention. Various modifications to the described embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments described herein, but rather to the widest scope consistent with the principles and features disclosed herein.

Claims

1. An easy-to-tear PET / VMCPP composite film, characterized in that: include: PET printed film layer; A VMCPP film layer, wherein the VMCPP film layer is stacked on top of the PET printed film layer, and the VMCPP film layer comprises a corona layer, an intermediate layer and a heat-sealing layer which are stacked in sequence from bottom to top, wherein the corona layer comprises TPC's ternary copolymer polypropylene pellets FL7322, and the intermediate layer comprises Sinopec's copolymer polypropylene pellets ZHP12J.

2. The easily tearable PET / VMCPP composite film according to claim 1, characterized in that: The corona layer is made of FL7322 with a content of 100%.

3. The easily tearable PET / VMCPP composite film according to claim 1, characterized in that: The corona layer also comprises random copolymer polypropylene pellets RD265 from Borouge Chemicals.

4. The easily tearable PET / VMCPP composite film according to claim 3, characterized in that: The corona layer is made of 80% FL7322 and 20% RD265.

5. The easily tearable PET / VMCPP composite film according to claim 1, characterized in that: The middle layer is made of ZHP12J with a content of 100%.

6. The easily tearable PET / VMCPP composite film according to claim 1, characterized in that: The middle layer also comprises Borouge Chemical's random copolymer polypropylene pellets RD265.

7. The easily tearable PET / VMCPP composite film according to claim 6, characterized in that: The middle layer is made of 80% ZHP12J and 20% RD265.

8. The easily tearable PET / VMCPP composite film according to claim 1, characterized in that: The heat sealing layer is made of terpolymer polypropylene pellets FL7642 with a TPC content of 100%.

9. The easily tearable PET / VMCPP composite film according to claim 1, characterized in that: The terpolymer polypropylene pellets FL7322 are terpolymers of propylene, ethylene and butene.

10. A method for preparing the easily tearable PET / VMCPP composite film according to any one of claims 1 to 9, characterized in that: The following steps are involved: Performing printing operation on PET to obtain PET printed film; The CPP resin is subjected to a casting operation to obtain a CPP base film; Under vacuum conditions, an aluminum plating operation is performed on the surface of the CPP base film to obtain an easy-to-tear VMCPP film; The VMCPP film was dry-laminated with the PET printed film to obtain an easily tearable PET / VMCPP composite film.

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