Easily tearable pet / vmcpp composite film and method for manufacturing the same

Abstract

The present application relates to a kind of easy tearing PET / VMCPP composite film, comprising: PET printing film layer;VMCPP film layer is stacked above PET printing film layer, VMCPP film layer includes sequentially stacked from bottom to top corona layer, intermediate layer and heat seal layer, wherein the corona layer includes the ternary copolymer polypropylene granules FL7322 of TPC, intermediate layer includes the copolymer polypropylene granules ZHP12J of Sinopec.The present application strengthens the adhesion of corona layer in VMCPP film layer, so that the peeling force of PET / VMCPP composite film is more excellent, and the present application of PET / VMCPP composite film is lower Elmore tear force, lower elongation at break, thereby making the tear force of overall composite film be lower, the easy tearing of composite film is enhanced, so that the experience of consumer is stronger.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of packaging materials, and more particularly, relates to an easy-to-tear PET / VMCPP composite film and a preparation method thereof. BACKGROUND

[0002] The 12PET / 30VMCPP composite film product widely circulated in the current market is tightly combined by 12μm-thick polyethylene terephthalate (PET) and 30μm-thick vacuum aluminum-coated cast polypropylene film (VMCPP), and this structure endows the packaging material with excellent barrier property, transparency and beautiful decorative effect. However, although these performance advantages of the composite film are remarkable, consumers often encounter the problem of poor easy-to-tear effect in the use process.

[0003] Specifically, when consumers try to open the product packaged by the composite film, they often find that the packaging is difficult to tear smoothly, and additional effort or the use of tools is needed for assistance. This inconvenience not only reduces the use experience of consumers, but also may cause doubts about the quality of the product, thereby negatively affecting the brand value of the customer.

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

[0005] In view of the deficiencies of the prior art, the purpose of the present application is to provide an easy-to-tear PET / VMCPP composite film and a preparation method thereof. The easy-to-tear property of the PET / VMCPP aluminum-coated composite film is improved by improving the formula of the VMCPP film layer.

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

[0007] According to an aspect of the present application, an easy-to-tear PET / VMCPP composite film comprises:

[0008] a PET printed film layer;

[0009] a VMCPP film layer stacked above the PET printed film layer, the VMCPP film layer comprising a corona layer, an intermediate layer and a heat-seal layer stacked in turn from bottom to top, wherein the corona layer contains TPC ternary copolymer polypropylene pellets FL7322, and the intermediate layer contains Sinopec copolymer polypropylene pellets ZHP12J.

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

[0011] In an embodiment of the present application, the corona layer further comprises random copolymer polypropylene granules RD265 of Boroujet.

[0012] In an embodiment of the present application, the corona layer is made of FL7322 in an amount of 80% and RD265 in an amount of 20%.

[0013] In an embodiment of the present application, the intermediate layer is made of ZHP12J in an amount of 100%.

[0014] In an embodiment of the present application, the intermediate layer further comprises random copolymer polypropylene granules RD265 of Boroujet.

[0015] In an embodiment of the present application, the intermediate layer is made of ZHP12J in an amount of 80% and RD265 in an amount of 20%.

[0016] In an embodiment of the present application, the heat-sealing layer is made of terpolymer polypropylene granules FL7642 of TPC in an amount of 100%.

[0017] In an embodiment of the present application, the terpolymer polypropylene granules FL7322 is a terpolymer product of propylene, ethylene and butylene.

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

[0019] performing a printing operation on the PET to obtain a PET printed film;

[0020] performing a casting operation on the CPP resin to obtain a CPP base film;

[0021] performing an aluminum plating operation on the surface of the CPP base film under vacuum conditions to obtain an easy-tear VMCPP film;

[0022] performing a dry compounding operation on the VMCPP film and the PET printed film to obtain the easy-tear PET / VMCPP composite film.

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

[0024] The present application strengthens the adhesion of the corona layer in the VMCPP film layer, makes the peeling force of the PET / VMCPP composite film more excellent, and the PET / VMCPP composite film of the present application has lower Elmendorf tear force and lower elongation at break, thereby making the tear force of the overall composite film lower, enhancing the easy-tear property of the composite film, and thus making the experience of consumers stronger. BRIEF DESCRIPTION OF DRAWINGS

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

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This diagram shows a cross-sectional view of the structure of an easily tearable PET / VMCPP composite film provided in an embodiment of the present invention;

[0028] Figure 2 It shows Figure 1 A schematic diagram of the process for preparing easily tearable PET / VMCPP composite films.

[0029] The components are: 1. PET printed film layer; 2. Corona layer; 3. Intermediate layer; 4. Heat-sealing layer; 5. VMCPP film layer. Detailed Implementation

[0030] To better understand the above-mentioned objectives, features, and advantages of the present invention, embodiments of the present invention will be further described below. It should be noted that, unless otherwise specified, embodiments of the present invention and features thereof can be combined with each other.

[0031] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention, but the invention may also be practiced in other ways than those described herein; obviously, the embodiments in the specification are only some, and not all, of the embodiments of the invention.

[0032] like Figure 1 As shown, an embodiment of the present invention provides a tearable PET / VMCPP composite film, comprising a PET printed film layer 1 and a VMCPP film layer 5 stacked on top of the PET printed film layer 1. The VMCPP film layer 5 comprises a corona layer 2, an intermediate layer 3 and a heat-sealing layer 4 stacked sequentially from bottom to top. The corona layer 2 may contain FL7322 ternary copolymer polypropylene granules from TPC (The Polyolefin Company (Singapore) Pte Ltd), the intermediate layer 3 may contain ZHP12J copolymer polypropylene granules from Sinopec, and the heat-sealing layer 4 uses FL7642 ternary copolymer polypropylene granules from TPC.

[0033] The present application strengthens the adhesion of the corona layer in the VMCPP film layer, makes the peeling force of the PET / VMCPP composite film more excellent, and the Elmendorf tear force of the PET / VMCPP composite film of the present application is lower, the elongation at break is lower, thereby making the tear force of the whole composite film lower, enhancing the tearability of the composite film, so that the experience of the consumer is stronger.

[0034] In the structure shown in the above embodiment, preferably, the corona layer 2 can be made entirely of FL7322, i.e. made of FL7322 with a content of 100%. Alternatively, the corona layer 2 also contains the random copolymer polypropylene pellets RD265 of Borou Chemical, so that the corona layer 2 can be made by mixing FL7322 with a content of 80% and RD265 with a content of 20%.

[0035] In the structure shown in the above embodiment, preferably, the intermediate layer 3 can be made entirely of ZHP12J, i.e. made of ZHP12J with a content of 100%. Alternatively, the intermediate layer 3 also contains the random copolymer polypropylene pellets RD265 of Borou Chemical, so that the intermediate 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-seal layer 4 is made entirely of FL7642, i.e. made of FL7642 with a content of 100%.

[0037] In the structure shown in the above embodiment, the terpolymer polypropylene pellets FL7322 are terpolymer products of propylene, ethylene and butylene.

[0038] As shown in Figure 2 The present application also provides a method for preparing the tearable PET / VMCPP composite film as described above, comprising:

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

[0040] Performing casting operation on the CPP resin to obtain a CPP base film;

[0041] Performing aluminum plating operation on the surface of the CPP base film under vacuum condition to obtain a tearable VMCPP film;

[0042] Performing dry compounding of the VMCPP film and the PET printed film to obtain the tearable PET / VMCPP composite film.

[0043] The above technical solutions of the present application will be described in detail through specific embodiments.

[0044] This invention mainly improves the tearability of the PET / VMCPP composite film by improving the formulation of the VMCPP film layer 5 in the PET / VMCPP composite film (mainly by improving the material or composition 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 contain FL7322, a terpolymer polypropylene granule of propylene-ethylene-butene TPC. After aluminizing, it exhibits superior aluminum layer adhesion and better peel strength when laminated with PET printed film. Alternatively, the corona layer 2 may further contain RD265, a random copolymer polypropylene granule from Borouge Chemicals.

[0047] The intermediate layer 3 in the VMCPP film layer 5 may contain Sinopec's copolymer polypropylene granules ZHP12J, which has a lower elongation at break, resulting in lower overall tear strength and easier film tearing. Alternatively, the intermediate layer 3 may further contain Borouge Chemicals' random copolymer polypropylene granules RD265.

[0048] In the VMCPP film layer 5, the heat-sealing layer 4 can be made entirely from TPC's ternary copolymer polypropylene granules FL7642.

[0049] Example 1

[0050] like Figure 1 As shown, a tearable PET / VMCPP composite film includes a PET printed film layer 1 and a VMCPP film layer 5 stacked on top of 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 from bottom to top, as shown in Table 1. In this embodiment 1, the corona layer 2 is made of 100% FL7322 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.

[0051] The PET / VMCPP composite film in Example 1 uses... Figure 2 It was prepared by the method shown.

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

[0053] Example 2

[0054] like Figure 1As shown, a tearable PET / VMCPP composite film includes a PET printed film layer 1 and a VMCPP film layer 5 stacked on top of 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 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. 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 uses... Figure 2 It was prepared by the method shown.

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

[0057] Example 3

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

[0059] The PET / VMCPP composite film in Example 3 uses... Figure 2 It was prepared by the method shown.

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

[0061] Comparative Example

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

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

[0064] Table 1: Components and thicknesses of the corona layer, intermediate layer and heat-seal layer of the VMCPP film layer in Examples 1-3 and the comparative example

[0065]

[0066]

[0067] Table 2: Performance tests of the PET / VMCPP composite film in Examples 1-3 and the comparative example

[0068]

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

[0070] As can be seen from the above Tables 1 and 2, the peeling force of the PET / VMCPP composite film of Examples 1-3 of the present application is more excellent, the Elmendorf tear strength is lower, and the elongation at break is lower, compared to the comparative example, thereby making the tear strength of the overall composite film of the present application lower, and enhancing the tearability of the composite film.

[0071] It should be noted that, in this document, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action, without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, an element defined by the phrase "comprising a... " does not exclude the existence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0072] The foregoing is considered as illustrative only of the principles of the application. Numerous modifications and changes will readily occur to those skilled in the art, which modifications and changes are to be understood as intended to be embraced by the principles described herein and the general scope of the application. Therefore, the application is not to be limited to the illustrations described herein but is to be accorded the full scope consistent with the language of the following claims.

Claims

1. A PET / VMCPP composite film which is easy to tear, characterized in that, Comprise: A PET printed film layer; A VMCPP film layer laminated above the PET printed film layer, the VMCPP film layer comprising a corona layer, an intermediate layer and a heat seal layer laminated in turn from bottom to top, wherein the corona layer is made of TPC ternary copolymerized polypropylene pellets FL7322 with a content of 100%, the intermediate layer is made of Sinopec copolymerized polypropylene pellets ZHP12J with a content of 100%; The corona layer is used for compounding with the PET printed film layer after aluminizing.

2. The easy tear PET / VMCPP composite film according to claim 1, wherein, The corona layer is made of FL7322 with a content of 80% and RD265 with a content of 20%.

3. The easy tear PET / VMCPP composite film according to claim 1, wherein, The intermediate layer is made of ZHP12J with a content of 80% and RD265 with a content of 20%.

4. The easy tear PET / VMCPP composite film according to claim 1, wherein, The heat seal layer is made of TPC ternary copolymerized polypropylene pellets FL7642 with a content of 100%.

5. The easy tear PET / VMCPP composite film according to claim 1, wherein, Ternary copolymerized polypropylene pellets FL7322 are ternary copolymerization products of propylene, ethylene and butylene.

6. A process for the production of the easy tear PET / VMCPP composite film as claimed in any one of claims 1 to 5, characterized in that, Comprise the following steps: Perform a printing operation on PET to obtain a PET printed film; Perform a casting operation on a CPP resin to obtain a CPP base film; Perform an aluminizing operation on the surface of the CPP base film under vacuum conditions to obtain a tearable VMCPP film; Perform dry compounding of the VMCPP film with the PET printed film to obtain a tearable PET / VMCPP composite film.

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