Transparent high barrier film for aseptic packaging and package

Abstract

This invention provides a transparent high-barrier film for aseptic packaging, comprising: an outer protective layer and a main base layer. The outer protective layer includes an outer layer and an outer base layer. The outer base layer includes transparent plastic and an ultraviolet absorber contained within the transparent plastic. The outer layer includes a peelable area defined by a pair of wavy weakening lines. The transparency of the outer layer is greater than or equal to 45% and less than or equal to 85%. The transparency of the main base layer and the outer base layer is greater than or equal to 80%. This film effectively reduces the impact of ultraviolet light on the contents and allows for observation of the contents, which are not easily observed, by peeling off the peelable area of ​​the outer layer, while ensuring strength and high barrier properties. This invention also provides packaging bodies using this transparent high-barrier film.

Description

Technical Field

[0001] This invention relates to a transparent high-barrier film for aseptic packaging and a package formed using the transparent high-barrier film. Background Technology

[0002] For liquid beverages such as dairy products and drinks that require sterilization and long-term storage, the market often uses two packaging forms: "Tetra Pak" and "Tali Pack". The film material of "Tetra Pak" packaging is a paper-aluminum-plastic composite film, while the film material of "Tali Pack" packaging is a multi-layer co-extruded black and white film, that is, the printed side of the film is white and the heat-sealed side is black.

[0003] Both types of packaging materials share a common problem: they do not display the contents, meaning end users cannot see the beverage inside. Furthermore, the paper-aluminum-plastic composite material of Tetra Pak packaging has significant limitations in terms of packaging equipment, the composite film material is expensive, and waste recycling is difficult. The addition of black masterbatch to Tetra Pak packaging poses a food safety risk, and the printed ink surface of the single-layer film carries the risk of contamination coming into contact with the milk.

[0004] Therefore, transparent composite packaging films have emerged on the market for packaging liquid beverages such as dairy products or drinks. For example, document CN108045051A, entitled "A High-Barrier Transparent Packaging Film with UV Resistance and its Production Method," discloses a packaging film with high transparency that reduces the impact of ultraviolet radiation on the film itself by adding UV-resistant masterbatch. However, the following problems still exist:

[0005] First, for liquid beverages with high vitamin content, simply reducing the impact of ultraviolet rays on the packaging film itself is not enough. Further protection against ultraviolet rays is needed, while simultaneously reducing the impact of ultraviolet rays on the liquid beverage inside.

[0006] Second, the study found that reducing transparency can reduce the impact of ultraviolet rays on the contents, but it reduces visibility for some colorless or liquid drinks such as milk. In other words, people want to be able to observe the contents well while also reducing the impact of ultraviolet rays on the contents.

[0007] Third, the high-barrier membrane also needs to have good oxygen barrier properties.

[0008] Therefore, there is a need to develop a membrane material that is suitable for sterilization / aseptic packaging, has high transparency, and high barrier properties. Summary of the Invention

[0009] To address these technical problems, the present invention provides a transparent high-barrier film for aseptic packaging.

[0010] A transparent high-barrier film for aseptic packaging includes: an outer protective layer and a main base layer. The outer protective layer includes an outer layer and an outer base layer. The outer base layer includes transparent plastic and an ultraviolet absorber contained within the transparent plastic. The outer layer includes a peelable region defined by a pair of wavy weakening lines. The transparency of the outer layer is greater than or equal to 45% and less than or equal to 85%. The transparency of the main base layer and the outer base layer is greater than or equal to 80%.

[0011] Among them, a pair of weakening lines are set in parallel intervals. The weakening lines are wavy curves on a rectangular coordinate system. The rectangular coordinate system includes mutually perpendicular X-axis, Y-axis and the intersection point O of the X-axis and Y-axis. The fitting equation of the wavy curve is: f(x)=k*sin(a*x+b)+n.

[0012] The outer layer includes a first side and a second side that are perpendicular to each other, and the X-axis is inclined to the first side.

[0013] The X-axis and the first side have an angle between them, which is 30° to 60°.

[0014] The outer layer includes several peelable regions, and the several peelable regions are arranged at equal intervals.

[0015] The adjacent peelable regions include a first peelable region and a second peelable region. The first peelable region includes a first weakening line and a second weakening line, and the second peelable region includes a third weakening line and a fourth weakening line. The third weakening line is adjacent to the second weakening line. If the fitting equation of the first weakening line is defined as f(x1) = k*sin(a*x1+b)+n1, the fitting equation of the second weakening line is f(x2) =

[0016] Given that the fitting equation for the third weakening line is f(x3) = k*sin(a*x2+b)+n2, and the fitting equation for the fourth weakening line is f(x4) = k*sin(a*x4+b)+n4, we have n3-2k-n2<0.

[0017] The distance between the first weakening line and the second weakening line is 1 to 10 mm.

[0018] The main base layer includes several matrix layers, each matrix layer includes a barrier layer, and the barrier layer is a multilayer composite film with a gradient distribution of crystallinity. The barrier layer includes at least three structural layers, and the difference in crystallinity between adjacent structural layers is greater than 5%.

[0019] The barrier substrate layer is an MDOPE film, and the crystallinity of each of its structural layers ranges from 40% to 80%. The barrier substrate layer includes five structural layers, namely an outer structural layer, an inner structural layer, and an intermediate layer, a second intermediate layer, and a third intermediate layer located between the outer structural layers. The crystallinity decreases sequentially from the outer structural layer to the inner structural layer, and the difference in crystallinity between adjacent structural layers is 5% to 15%.

[0020] A packaging body comprising the aforementioned transparent high-barrier film.

[0021] Beneficial Effects: This invention provides a transparent high-barrier film for aseptic packaging, comprising: an outer protective layer and a main base layer. The outer protective layer includes an outer layer and an outer base layer. The outer base layer includes transparent plastic and an ultraviolet absorber contained within the transparent plastic. The outer layer includes a peelable area defined by a pair of wavy weakening lines. The transparency of the outer layer is greater than or equal to 45% and less than or equal to 85%. The transparency of the main base layer and the outer base layer is greater than or equal to 80%. On the one hand, this effectively reduces the impact of ultraviolet light on the contents. On the other hand, the contents, which are not easily observed, can be observed by peeling off the peelable area of ​​the outer layer, while ensuring strength and high barrier properties. This invention also provides packaging bodies using this transparent high-barrier film. Attached Figure Description

[0022] Figure 1 A schematic diagram of the transparent high-barrier film structure for aseptic packaging according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the peelable region on the outer layer;

[0024] Component descriptions in the diagram:

[0025] Outer protective layer 10; First side 101; Second side 102; Peelable area 103; First weakening line 1031; Second weakening line 1032; Third weakening line 1033; Fourth weakening line 1034; X-axis 1041; Y-axis 1042; Outer layer 11; Adhesive layer 111; Outer base layer 12; Main base layer 20; Outer layer 21; Spacer layer 22; Barrier layer 23; Adhesive layer 24; Inner layer 25; Inner second layer 26. Detailed Implementation

[0026] Please refer to Figure 1 This invention provides a transparent high-barrier film for aseptic packaging, comprising an outer protective layer 10 and a main base layer 20. The following terms are defined as follows:

[0027] "Polymer" refers to a polymeric compound prepared by polymerizing the same or different types of monomers.

[0028] A copolymer is a polymer prepared by polymerizing at least two different types of monomers.

[0029] "Ethylene-based polymers" refers to polymers that contain a majority amount of ethylene monomers (by weight of the polymer) in polymeric form and may optionally contain one or more comonomers.

[0030] “EVOH” refers to a polymer containing repeating units of ethylene and vinyl alcohol.

[0031] The outer protective layer 10 includes an outer layer 11 and an outer base layer 12. The outer base layer 12 includes transparent plastic and an ultraviolet absorber contained in the transparent plastic. The outer layer 11 is stacked on the outer base layer 12. The transparency of the outer layer 11 is less than or equal to 85% and greater than or equal to 45%, making the outer layer 11 semi-transparent. Due to the relatively low transparency of the outer layer 11, the light intensity will be reduced.

[0032] Specifically, the outer layer 11 can be PE, PET, or PP plastic. In a specific embodiment, a coating, such as a silicon dioxide coating, can be applied to the peelable layer to make it semi-transparent. Alternatively, the peelable layer can be made semi-transparent by atomizing or frosting it.

[0033] Please refer to this as well. Figure 2 The outer layer 11 includes a peelable region 103, which is defined by a pair of wavy weakening lines. Specifically, the weakening lines are wavy curves on a Cartesian coordinate system, which includes mutually perpendicular X-axis 1041, Y-axis 1042, and the intersection point O of X-axis 1041 and Y-axis 1042. The fitting equation of the wavy curve is: f(x) = k*sin(a*x+b)+n, where k and a are constants greater than 0, b and n are constants, and x is the distance of a point on the wavy curve from point O along the X-axis 1041. It can be understood that the pair of weakening lines are set in parallel intervals. If the pair of wavy curves have the same reference point, then the parameters k, a, and b in the fitting equation of the pair of wavy curves are the same, and n is the distance between the two wavy curves.

[0034] Specifically, in this embodiment, the pair of weakening lines includes a first weakening line 1031 and a second weakening line 1032. If the fitting equation of the first weakening line 1031 is defined as f(x1)=k*sin(a*x1+b)+n1, and the fitting equation of the second weakening line 1032 is defined as f(x2)=k*sin(a*x1+b)+n2, then 10mm≥n2-n1≥1mm, so that the user can easily peel off the peelable area 103, that is, the distance between the first weakening line 1031 and the second weakening line 1032 is 1~10mm.

[0035] Understandably, the weakening line includes several through holes penetrating the outer layer 11. These through holes are arranged in a linear shape and are wavy. The through holes are either dotted or linear, and there are connecting portions between adjacent through holes. The through holes and connecting portions make the weakening line weaker than other areas, so that the user can tear the peelable area 103 or separate it from other areas along the direction in which the weakening line extends.

[0036] It is understood that the term "dot-shaped" refers to a through-hole whose length-to-width ratio is less than or equal to 5, while "line-shaped" refers to a through-hole whose length-to-width ratio is greater than 5.

[0037] Furthermore, the outer layer 11 includes a first side 101 and a second side 102. The first side 101 is parallel to the length direction of the outer layer 11, and the second side 102 is parallel to the width direction. That is, the first side 101 and the second side 102 are perpendicular. In a specific embodiment, the length direction is also referred to as the MD direction (Machine Direction), and the width direction is also referred to as the CD direction (Cross Direction). The X-axis 1041 is inclined to the first side 101.

[0038] Furthermore, the X-axis 1041 and the first side 101 have an included angle, which is 30° to 60°.

[0039] Furthermore, the outer layer 11 includes a plurality of peelable regions 103, and the plurality of peelable regions 103 are arranged at equal intervals.

[0040] Furthermore, the adjacent peelable regions 103 include a first peelable region 103 and a second peelable region 103. The first peelable region 103 includes a first weakening line 1031 and a second weakening line 1032, and the second peelable region 103 includes a third weakening line 1033 and a fourth weakening line 1034. The third weakening line 1033 and the second weakening line 1032 are arranged adjacent to each other. If the fitting equation for the first weakening line 1031 is defined as f(x1) = ...

[0041] The fitting equation for the second weakening line 1032 is f(x2)=k*sin(a*x2+b)+n2, the fitting equation for the third weakening line 1033 is f(x3)=k*sin(a*x3+b)+n3, and the fitting equation for the fourth weakening line 1034 is f(x4)=k*sin(a*x4+b)+n4. Then, (-k+n3)-(k+n2)=n3-2k-n2<0, which makes the area formed after the adjacent peelable area 103 is peeled off overlap in the direction along the Y-axis 1042, so that the waterline of the contents is visible in at least one area in the direction along the Y-axis 1042.

[0042] The outer base layer 12 includes transparent plastic and an ultraviolet absorber contained within the transparent plastic.

[0043] Specifically, the transparent plastic can be a rigid or flexible single-layer and / or multi-layer plastic sheet or film. The sheet or film can be formed from polyester, polyolefin, or polyolefin copolymer. The polyolefin copolymer can be ethylene-vinyl acetate, polystyrene, poly(vinyl chloride), poly(vinylidene chloride), polyamide, cellulose, polycarbonate, ethylene-vinyl alcohol, poly(vinyl alcohol), etc.

[0044] Preferably, the sheet or film material mainly comprises polyester, such as polyethylene terephthalate (PET), and polyolefins, such as polyethylene or polypropylene. More preferably, it mainly comprises PET or HDPE. "Mainly" means that the content of this material in the sheet or film material is greater than or equal to 60%.

[0045] The ultraviolet absorber may include, for example, benzotriazole, sodium naphtholic acid sulfate, etc.

[0046] Furthermore, the outer layer 11 also includes an adhesive layer 111, which is used to bond the outer layer 11 to the outer base layer 12. The adhesive force between the adhesive layer 111 and the outer layer 11 is greater than the adhesive force between the adhesive layer 111 and the outer base layer 12, so that the peelable area 103 can be easily separated from the outer base layer 12.

[0047] Furthermore, the bonding force between the peelable area 103 and the outer base layer 12 is less than or equal to 10N and greater than or equal to 2N, so that it can maintain its shape during the production process and can be easily separated during use.

[0048] The main base layer 20 is disposed below the outer base layer 12 and includes several matrix layers. The matrix layer includes at least one barrier layer 23. In this embodiment, the barrier layer 23 is a polymer film. Specifically, the polymer film can be a film formed by blending at least one or more polymers whose monomers are esters, amides, or olefins. Preferably, the barrier matrix is ​​a polyolefin film, specifically, it can be uniaxial or biaxially oriented polypropylene (PP, OPP, BOPP), polyethylene, such as oriented or non-oriented high-density polyethylene (HDPE), linear low-density polyethylene (LLDPE), and cyclic olefin copolymers (COC), etc.

[0049] In a preferred embodiment, the barrier layer 23 is a multilayer composite film with a gradient distribution of crystallinity. The gradient distribution means that the difference in crystallinity between adjacent layers is greater than 5%. For example, in one embodiment, the barrier matrix layer includes at least three structural layers, and the difference in crystallinity between adjacent structural layers is greater than 5%. In another embodiment, the barrier layer 23 includes five structural layers, specifically an outer structural layer, an inner structural layer, and an intermediate layer, a second intermediate layer, and a third intermediate layer located between the outer structural layers. The crystallinity decreases sequentially from the outer structural layer to the inner structural layer, and the difference in crystallinity between adjacent structural layers is 5%-15%. Studies have found that configuring the crystallinity of the structural layers into a gradient distribution causes changes in the microstructure of adjacent structural layers. When oxygen moves from one type of microstructure to another different microstructure, a greater resistance is formed at the interface, thus improving the barrier performance against oxygen. The difference in crystallinity between adjacent structural layers refers to the difference between the higher crystallinity and the lower crystallinity in adjacent structural layers.

[0050] Furthermore, the crystallinity of the outer structural layer is 78%–85%, and the crystallinity of the inner structural layer is 35–50%.

[0051] Furthermore, the barrier layer 23 is an MDOPE film, and the crystallinity of each of its structural layers ranges from 40% to 80%. Within this range, it can not only satisfy excellent barrier properties, but also provide good support for the barrier layer 2320, and provide better compatibility for subsequent vapor deposition or coating processes.

[0052] Furthermore, the barrier layer 23 has a basis weight of 20-30 g / m².

[0053] Furthermore, a barrier coating is provided on the barrier layer 23. The barrier coating is basically composed of aluminum metal or aluminum oxide and can be applied to the barrier layer 23 by physical vapor deposition (PVD) or chemical vapor deposition (CVD). The barrier coating has a thickness of 3-8 nm so that the main substrate 20 still has good transparency and good oxygen barrier performance.

[0054] Furthermore, the substrate layer includes an inner layer, which is a layer that directly contacts the food contained in the final packaged container. Typically, the inner layer is heat-sealable and thermoplastic. Specifically, the inner layer includes an inner first layer 25 and an inner second layer 26, wherein the inner second layer 26 is located on the side adjacent to the food. In one specific embodiment, the inner first layer 25 and the inner second layer 26 are formed by hot melt co-extrusion. In other embodiments, the inner first layer 25 and the inner second layer 26 can also be formed by coating or lamination.

[0055] Furthermore, both the inner layer 25 and the inner second layer 26 are heat-sealing layers used to prevent the contents from penetrating into the packaging material, while providing adhesive layers 111 for horizontal and vertical sealing, protecting the product flavor and the integrity of the packaging material. The inner layer 25 or the inner second layer 26 can be polyethylene, polypropylene, or other olefin resins, including low-density polyethylene, linear low-density polyethylene, metallocene linear low-density polyethylene, high-density polyethylene, medium-density polyethylene, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / ethyl acrylate copolymer, and other resins, which can also be used in appropriate combinations. Preferably, both the inner layer 25 and the inner second layer 26 are mainly made of polyethylene.

[0056] Furthermore, the melt flow index (190℃ / 2.16kg) of the inner layer 25 and the inner second layer 26 ranges from 5 to 20 g / 10min, and the density ranges from 0.910 to 0.930 g / cm³. 3 The inner layer (25g) and the inner second layer (26g) weigh between 10 and 30g / m², respectively. 2 Within the range.

[0057] Furthermore, the substrate layer includes an outer layer 21 disposed outside the barrier layer 23. Specifically, the outer layer 21 is disposed between the outer substrate 12 and the barrier layer 23. The outer layer 21 is a thermoplastic resin layer, which can be olefin resins such as polyethylene and polypropylene. More specifically, it includes various resins such as low-density polyethylene, linear low-density polyethylene, metallocene linear low-density polyethylene, high-density polyethylene, medium-density polyethylene, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, and ethylene / ethyl acrylate copolymer. They can also be used in appropriate combinations. The outer layer 11 is mainly polyethylene.

[0058] Furthermore, the melt index (190℃ / 2.16kg) of the resin ranges from 5 to 10 g / 10 min, and the density ranges from 0.910 to 0.930 g / cm³. 3 Weight is 10-20g / m³ 2 Within the range.

[0059] The outer layer 21 can be further used as a waterproof layer.

[0060] Furthermore, a spacer layer 22 can be provided between the barrier layer 23 and the inner layer. The spacer layer 22 is used to bond the barrier layer 23 and ensure the integrity of the packaging material. The spacer layer 22 can be a thermoplastic resin, specifically, it can be an olefin resin such as polyethylene or polypropylene, including low-density polyethylene, linear low-density polyethylene, metallocene linear low-density polyethylene, high-density polyethylene, medium-density polyethylene, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / ethyl acrylate copolymer, and other resins. They can also be used in appropriate combinations. Preferably, the spacer layer 22 is mainly polyethylene.

[0061] Furthermore, the melt index (190℃ / 2.16kg) of the resin in the spacer layer 22 ranges from 5 to 10 g / 10 min, and the density ranges from 0.910 to 0.930 g / cm³. 3 Basis weight is 15-40 g / m³ 2 Within the range.

[0062] Furthermore, an adhesive layer 24 can be provided between the barrier layer 23 and the inner layer. The adhesive layer 24 can be an olefin resin such as polyethylene or polypropylene, including low-density polyethylene, linear low-density polyethylene, metallocene linear low-density polyethylene, high-density polyethylene, medium-density polyethylene, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / ethyl acrylate copolymer, and other resins, which can also be used in appropriate combinations. It can also be an ethylene / acrylic acid copolymer, ethylene / vinyl acetate copolymer, ethylene / methyl acrylate copolymer, ethylene / ethyl acrylate copolymer, ionic copolymer, maleic anhydride-grafted ethylene polymer, cellulose, and starch polysaccharides, etc. Preferably, the adhesive layer 24 is mainly polyethylene.

[0063] Furthermore, the resin of the adhesive layer 24 has a melt index (190℃ / 2.16kg) ranging from 5 to 10 g / 10 min and a density ranging from 0.910 to 0.940 g / cm³. 3 Weight is 3-10g / m 2 Within the range.

[0064] Furthermore, the basis weight of the composite packaging material is 100–300 g / m², and the thickness is 50–500 μm.

[0065] In this invention, the transparency of the outer layer 11 is greater than or equal to 45% and less than or equal to 85%, and the transparency of the main base layer 20 and the outer base layer 12 is greater than or equal to 80%. It is understood that the transparent high-barrier film for aseptic packaging of this application has the following two uses:

[0066] Firstly, for colored or easily distinguishable liquid beverages, such as orange juice and grape juice, the liquid level or state of the liquid beverage inside can be directly observed through a transparent high-barrier membrane.

[0067] Secondly, for liquid beverages whose internal conditions are not easily discernible, such as milk, the liquid level or state of the internal liquid beverage can be viewed by peeling off the peelable area 103.

[0068] Because the outer layer 11 has a certain degree of opacity, the amount of light passing through the transparent high-barrier film into the interior is greatly reduced, thus reducing the impact of ultraviolet rays on the contents. Furthermore, the outer base layer 12 contains ultraviolet absorbers to further reduce the impact of ultraviolet rays on the contents. Additionally, setting the peelable area 103 in a wavy shape also brings the following effects:

[0069] Firstly, the wavy shape of the peelable region 103 will make the peelable region 103 continuously change in the MD and CD directions, reducing the impact on the strength of the transparent high barrier film, especially the strength in the MD direction, thereby ensuring the tension requirements during the production of the transparent high barrier film.

[0070] Secondly, the continuously changing shape of the peelable area 103 can reduce the occurrence of peeling at the edges of the peelable area 103, ensuring the integrity of the packaging, and it can only be peeled off when needed by the user.

[0071] In addition, this design allows the openable peelable area 103 to be strip-shaped, while other areas can ensure coverage of the outer base layer 12 and the main base layer 20, thereby reducing the overall impact of ultraviolet radiation on the contents.

[0072] Further research revealed that, compared to existing PET packaging, the shelf life of fruit juice products with high vitamin content can be extended by more than 7%, while the vitamin loss rate is reduced by more than 15% over 6 months. Additionally, experimental testing showed that the transparent high-barrier film of this invention achieves an OTR (Over-The-Trend) of <1cm. 3 / m 2 At 1 atm, 23°C, 50% RH, WVTR: <2.5 g / (m2*day), it has very good barrier properties.

[0073] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A transparent high barrier film for aseptic packaging, comprising: An outer protective layer and a main base layer, characterized in that the outer protective layer comprises an outer layer and an outer base layer, the outer base layer comprising transparent plastic and an ultraviolet absorber contained within the transparent plastic, the outer layer comprising a peelable region defined by a pair of wavy weakening lines, the weakening lines forming a wavy curve on a rectangular coordinate system, the rectangular coordinate system comprising mutually perpendicular X-axis, Y-axis and the intersection point O of the X-axis and Y-axis, the weakening lines being arranged by through-holes penetrating the outer layer, forming a sine curve, the fitting equation of which is: Where k and a are constants greater than 0, b and n are constants, and the transparency of the outer layer is greater than or equal to 45% and less than or equal to 85%, the transparency of the main base layer and the outer base layer is greater than or equal to 80%, a pair of weakening lines are arranged in parallel and spaced apart, the main base layer includes several matrix layers, the matrix layer includes a barrier layer, the barrier layer is a multilayer composite film with a crystallinity gradient distribution, the barrier layer includes at least three structural layers, and the crystallinity difference between adjacent structural layers is greater than 5%.

2. The transparent high-barrier film as described in claim 1, characterized in that, The outer layer includes a first side and a second side that are perpendicular to each other, and the X-axis is inclined to the first side.

3. The transparent high barrier film according to claim 2, wherein The X-axis and the first side edge form an angle, which is 30° to 60°.

4. The transparent high barrier film according to claim 3, wherein The outer layer includes several peelable regions, and the several peelable regions are arranged at equal intervals.

5. The transparent high barrier film according to claim 4, wherein The adjacent peelable regions include a first peelable region and a second peelable region. The first peelable region includes a first weakening line and a second weakening line, and the second peelable region includes a third weakening line and a fourth weakening line. The third weakening line is adjacent to the second weakening line. If the fitting equation for the first weakening line is defined as... The fitting equation for the second weakening line is: The fitting equation for the third weakening line is: The fitting equation for the fourth weakening line is: Then, n3-2k-n2<0.

6. The transparent high-barrier film as described in claim 5, characterized in that, The distance between the first weakening line and the second weakening line is 1 to 10 mm.

7. The transparent high-barrier film as described in claim 1, characterized in that, The barrier layer is an MDOPE film, and the crystallinity of each of its structural layers ranges from 40% to 80%. The barrier layer includes five structural layers, namely an outer structural layer, an inner structural layer, and an intermediate layer, a second intermediate layer, and a third intermediate layer located between the outer structural layers. The crystallinity decreases sequentially from the outer structural layer to the inner structural layer, and the difference in crystallinity between adjacent structural layers is 5% to 15%.

8. A package, characterized by Including the transparent high-barrier film as described in any one of claims 1-7.

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