Composite film for milk powder packaging and milk powder packaging bag

Abstract

The utility model relates to the technical field of film packaging, in particular to a composite film for milk powder packaging and a milk powder packaging bag. The composite film for milk powder packaging sequentially comprises a heat-sealing layer, a heat-sealing layer and a heat-sealing layer from bottom to top, wherein the heat-sealing layer is a high-strength PE film layer; the first bonding layer is formed on the heat sealing layer, and the first bonding layer is a solvent-free double-component polyurethane glue layer; the middle layer is formed on the first bonding layer, and the middle layer is a BOPA (Biaxially Oriented Polyamide) enhanced aluminized film layer; the second bonding layer is formed on the middle layer, and the second bonding layer is a solvent-free double-component polyurethane glue layer; and the printing layer is formed on the second bonding layer, and the printing layer is a BOPET (Biaxially Oriented Polyethylene Terephthalate) film layer. According to the milk powder packaging bag made of the composite film for packaging the milk powder, the overall performance of the packaging bag is improved, such as the anti-falling performance, the anti-puncture performance and the high peeling strength.

Description

Technical Field

[0001] This utility model relates to the field of film packaging technology, and in particular to a composite film and milk powder packaging bag for milk powder packaging. Background Technology

[0002] With the increasing health awareness of people, the demand for different types of milk powder is constantly increasing. Goat milk powder is a type of milk powder made from goat milk. Compared with other milk powders (such as cow milk, mare milk, etc.), it has higher nutritional value and is easily absorbed. In Europe and America, goat milk is regarded as a premium dairy product and is called "aristocratic milk". It is also known as the "king of milk" in the international academic community.

[0003] In recent years, goat milk powder, as a newly emerging type of milk powder, has seen its market share steadily rise, frequently appearing in media reports and gaining increasing popularity. Given the rich nutritional value of goat milk powder, it's crucial to prevent spoilage and contamination during packaging and transportation. When choosing packaging bags for goat milk powder, factors such as material safety, sealing performance, durability, cost-effectiveness, drop resistance, and puncture resistance must be considered. Currently, the main packaging structures used in the market are PET / AL / PE or BOPP / VMPET. While PET / AL / PE / BOPP / VMPET offers excellent oxygen and water vapor barrier properties, it lacks superior drop resistance, making it prone to breakage during transportation. Furthermore, its lack of puncture resistance allows sharp objects to puncture the bags, contaminating the goat milk powder. Moreover, the VMPET currently used is often ordinary VMPET with a thin aluminum layer, prone to incomplete plating, affecting barrier performance. The aluminum layer's adhesion is also weak, leading to insufficient peel strength.

[0004] Therefore, ensuring the airtightness of goat milk powder packaging bags while improving their overall performance, such as drop resistance, puncture resistance, and peel strength, has become one of the technical challenges that urgently need to be solved by those skilled in the art. Utility Model Content

[0005] To address the shortcomings of existing packaging bags used for goat milk powder packaging, this utility model provides a composite film and packaging bag for milk powder packaging, which can improve the overall performance of the packaging bag, such as drop resistance, puncture resistance, and peel strength.

[0006] To achieve at least one or more of the aforementioned advantages, this utility model provides a composite film for milk powder packaging, comprising, from bottom to top: a heat-sealing layer, which is a high-strength PE film layer; a first adhesive layer formed on the heat-sealing layer, which is a solvent-free two-component polyurethane adhesive layer; an intermediate layer formed on the first adhesive layer, which is a BOPA-reinforced aluminized film layer; a second adhesive layer formed on the intermediate layer, which is a solvent-free two-component polyurethane adhesive layer; and a printing layer formed on the second adhesive layer, which is a BOPET film layer.

[0007] In some embodiments, the thickness of the heat-sealing layer ranges from 40 to 60 micrometers.

[0008] In some embodiments, the thickness of the intermediate layer ranges from 15 to 25 micrometers.

[0009] In some embodiments, the optical density value of the aluminum-plated layer in the intermediate layer is 2.8 to 3.2.

[0010] In some embodiments, the thickness of the printed layer ranges from 12 to 25 micrometers.

[0011] In some embodiments, the thicknesses of the first adhesive layer and the second adhesive layer range from 1.5 to 2.0 micrometers, respectively.

[0012] To achieve at least one or more of the aforementioned advantages, this utility model also provides a milk powder packaging bag that can be used for packaging goat milk powder, wherein the milk powder packaging bag is made of a composite film for milk powder packaging as described above.

[0013] To achieve at least one or more of the aforementioned advantages, this utility model also provides a milk powder packaging bag that can be used for packaging goat milk powder. The milk powder packaging bag includes at least a bag body and a spout or clip connected to the bag body. The bag body is made of a composite film for milk powder packaging as described above.

[0014] The composite film and milk powder packaging bag provided by this utility model have at least the following advantages compared with existing milk powder packaging bags:

[0015] 1. The heat-sealing layer uses high-strength PE film, which not only has excellent high strength and high toughness, but also excellent antibacterial and heat-sealing properties.

[0016] 2. The intermediate layer uses a BOPA-reinforced aluminum-coated film layer, which not only has excellent oxygen and water vapor barrier properties, but also excellent drop resistance and puncture resistance; at the same time, it also has excellent UV resistance.

[0017] 3. The printing layer uses a BOPET film layer, which not only has excellent printing performance, but also excellent water resistance.

[0018] 4. The first and second adhesive layers connecting the heat-sealing layer, intermediate layer and printing layer use solvent-free two-component polyurethane adhesive layers, which are environmentally friendly and can also reduce solvent residue.

[0019] 5. The composite film for milk powder packaging in this application adopts a multi-layer composite structure design, making full use of the advantages of different film layers in each layer for coordinated reinforcement, thereby obtaining excellent composite performance. Milk powder packaging bags made with the composite film for milk powder packaging in this application have higher drop resistance, puncture resistance, and peel strength, enabling the milk powder packaging bags to better retain the nutritional value of goat milk powder, etc. This type of milk powder packaging bag can meet the high performance requirements of various milk powder (such as goat milk powder) packaging bags industry. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a cross-sectional structural schematic diagram of an embodiment of the composite film for milk powder packaging in this utility model;

[0022] Figure 2 This is a front view of an embodiment of the milk powder packaging bag of this utility model;

[0023] Figure 3 for Figure 2 The left view of an embodiment of a milk powder packaging bag shown.

[0024] Reference numerals: 10-Heat-sealing layer, 20-First adhesive layer, 30-Intermediate layer, 40-Second adhesive layer, 50-Printed layer, 100-Bag body, 110-First side of bag body, 120-Second side of bag body, 131-Straight easy-tear opening, 132-Easy-tear straight line, 200-Bag bottom, 210-Center line of bag bottom film, 310-Heat-sealed edge, 320-Opening section, 400-Containing cavity, 410-Upper cavity, 420-Lower cavity, 500-Filter membrane. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] In the description of this utility model, it should be understood that the terms "center," "lateral," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. Additionally, the term "comprising" and any variations thereof mean "at least comprising."

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integrally formed connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments. Unless the context clearly indicates otherwise, the singular forms “a” and “an” as used herein are also intended to include the plural. It should also be understood that the terms “comprising” and / or “including” as used herein specify the presence of the stated features, integers, steps, operations, units, and / or components, without excluding the presence or addition of one or more other features, integers, steps, operations, units, components, and / or combinations thereof.

[0029] Please see Figure 1 , Figure 1This is a cross-sectional structural diagram of an embodiment of the composite film for milk powder packaging according to the present invention. To achieve at least one or more of the aforementioned advantages, an embodiment of the present invention provides a composite film for milk powder packaging, as shown in the figure. The composite film for milk powder packaging includes, from bottom to top, a heat-sealing layer 10, a first adhesive layer 20, an intermediate layer 30, a second adhesive layer 40, and a printing layer 50.

[0030] In some embodiments, the heat-sealing layer 10 may be a high-strength PE film layer, possessing high strength and high toughness. The thickness of the heat-sealing layer 10 ranges from 40 to 60 micrometers. A first adhesive layer 20 is formed on the heat-sealing layer 10, and the first adhesive layer 20 is a solvent-free two-component polyurethane adhesive layer. The thickness of the first adhesive layer 20 ranges from 1.5 to 2.0 micrometers. An intermediate layer 30 is formed on the first adhesive layer 20, and the intermediate layer 30 may be a BOPA-reinforced aluminized film layer, possessing excellent oxygen and water vapor barrier properties, excellent drop resistance, puncture resistance, and excellent UV resistance. The thickness of the intermediate layer 30 ranges from 15 to 25 micrometers. The optical density value of the aluminized layer in the intermediate layer 30 is 2.8 to 3.2. A second adhesive layer 40 is formed on the intermediate layer 30, and the second adhesive layer 40 is a solvent-free two-component polyurethane adhesive layer. The thickness of the second adhesive layer 40 ranges from 1.5 to 2.0 micrometers. The solvent-free two-component polyurethane adhesive layer contains no solvents, resulting in high environmental performance. The printed layer 50 is formed on the second adhesive layer 40. The printed layer 50 can be a BOPET film layer, which not only has excellent printability but also excellent water resistance. The thickness of the printed layer 50 ranges from 12 to 25 micrometers. This composite film for milk powder packaging exhibits excellent comprehensive performance, such as high drop resistance, high puncture resistance, and high peel strength, offering high overall cost-effectiveness and meeting market demands.

[0031] Example 1

[0032] A composite film for milk powder packaging and a milk powder packaging bag made from the composite film, wherein the composite film for milk powder packaging includes, from bottom to top (or from inside to outside) a heat-sealing layer 10, a first adhesive layer 20, an intermediate layer 30, a second adhesive layer 40 and a printing layer 50.

[0033] In this embodiment, the heat-sealing layer 10, prepared by the method disclosed in CN117551294A and entitled "A High-Strength PE Film and Its Preparation Method," has a thickness of 60 micrometers. This heat-sealing layer 10 not only possesses excellent high strength and high toughness but also excellent antibacterial and heat-sealing properties.

[0034] In this embodiment, the intermediate layer 30 is prepared using the method described in CN110563987B, entitled "A BOPA-enhanced aluminized film and its preparation method," and has a thickness of 15 micrometers and an optical density value of 3.0 for the aluminized layer in the intermediate layer 30. This intermediate layer 30 not only has excellent oxygen and water vapor barrier properties, excellent drop resistance and puncture resistance, but also excellent UV resistance.

[0035] In this embodiment, the printing layer 50 is made of BOPET film produced by Jiangsu Shuangxing Color Plastic New Material Co., Ltd., and its thickness is 12 micrometers. This printing layer 50 not only has excellent printing performance, but also excellent water resistance.

[0036] In this embodiment, the first adhesive layer 20 and the second adhesive layer 40 are made of solvent-free two-component polyurethane adhesive of model WD8118A / B from Shanghai Kangda Chemical New Materials Co., Ltd., and have a thickness of 1.5 micrometers respectively. They have high bonding strength, are solvent-free, and have high environmental performance.

[0037] After multiple experiments and comparisons, and considering the production cost of composite films for milk powder packaging, it can be seen that the composite film for milk powder packaging in Example 1 has a high cost-performance ratio. Furthermore, its relevant performance was tested, and the specific results are shown in Table 1.

[0038] Table 1 Performance tests of composite film and packaging bag for milk powder packaging in Example 1

[0039] serial number project Example 1 Testing standards 1 Drop resistance test (packaging bag) Unbroken GB / T 10004-2008 2 Puncture resistance > 60N GB / T10004-2008 3 Oxygen permeability (25℃, 50%RH) <![CDATA[0.50 cc / (m 2 *day)]]> ASTM F1927 4 Water vapor transmission rate (38℃, 90%RH) 2.00 g / (m²·24h) GB / T 21529-2008

[0040] As shown in the table above, the composite film for milk powder packaging and the milk powder packaging bag made from this composite film have excellent oxygen and water vapor barrier properties, preventing oxygen and water vapor from entering the goat milk powder through the composite film, thereby preventing oxidation, deterioration, moisture absorption, and clumping, and extending the shelf life of the goat milk powder. Simultaneously, it has excellent drop resistance, reducing the probability of bag breakage during transportation and lowering transportation costs. This composite film and milk powder packaging bag also have excellent puncture resistance, preventing sharp objects from puncturing the bag and thus preventing contamination of the goat milk powder due to bag breakage, which would affect its storage and transportation. Furthermore, this composite film and milk powder packaging bag have excellent UV protection properties, preventing ultraviolet rays from penetrating the packaging bag and damaging the nutritional components of the goat milk powder.

[0041] To achieve at least one or more of the aforementioned advantages, one embodiment of the present invention provides a milk powder packaging bag that can be used for packaging goat milk powder, wherein the milk powder packaging bag is made of a composite film for milk powder packaging as described above.

[0042] To achieve at least one or more of the aforementioned advantages, one embodiment of the present invention provides a milk powder packaging bag that can be used for packaging goat milk powder. The milk powder packaging bag includes at least a bag body and a spout or clip connected to the bag body. The bag body is made of a composite film for milk powder packaging as described above.

[0043] Example 2

[0044] Please combine Figure 1 See Figure 2 , Figure 2 This is a schematic diagram of the structure of an embodiment of the milk powder packaging bag of this utility model. Figure 3 for Figure 2 The image shows a left view of an embodiment of a milk powder packaging bag. This utility model provides a milk powder packaging bag, as shown in the figure, comprising a bag body 100 and a bag bottom 200, which is made using the composite film for milk powder packaging described in Embodiment 1.

[0045] The bag body 100 includes a first side 110 and a second side 120, both of which have a convex rectangular film on the upper part. The bag bottom 200 is sandwiched between the first side 110 and the second side 120 and is heat-sealed with the first side 110 and the second side 120 at the periphery, thereby forming a heat-sealed edge 310, an opening section 320 and a receiving cavity 400.

[0046] In the example shown, the opening segment 320 is formed by not heat-sealing the entire or part of the top edge of the protruding rectangular portion at the top of the bag body 100. In some specific embodiments, the shape of the opening segment 320 can be a spout or a clamp.

[0047] The bottom of the bag 200 has a center line 210 for the bottom film. In actual milk powder packaging bags, the center line 210 of the bottom film is a crease, therefore... Figure 2 The schematic diagram of the center line 210 of the bottom film of the bag basically coincides with the bottom of the bag 200. When the bottom of the bag 200 is folded along the center line 210, it can be hidden inside the bag body 100. When the bottom of the bag 200 is unfolded along the center line 210, it can open the lower part of the first side 110 and the second side 120 of the bag body, forming a self-supporting structure of the bag body. The accommodating cavity 400 formed by the bottom of the bag 200 and the bag body 100 is opened, and milk powder can be filled through the opening section 320 to achieve milk powder packaging.

[0048] Please see Figure 3 The milk powder packaging bag can be a self-standing structure, and together with the composite film for milk powder packaging in Example 1, the milk powder packaging bag has good upright performance. It can make the milk powder packaging bag stand up well without adding materials, and prevent the milk powder from spilling when the milk powder packaging bag is tilted during filling or taking out.

[0049] See again Figure 2 In some specific embodiments, the milk powder packaging bag may further include a filter membrane 500, which can be fixed to the upper inner side of the bag body 100 by heat sealing at the periphery, dividing the accommodating cavity 400 into an upper cavity 410 and a lower cavity 420, which can be used to filter impurities in the milk powder.

[0050] Specifically, during the filling of goat milk powder, etc., the filter membrane 500 can retain impurities and particles in the goat milk powder at the upper cavity 410, thereby ensuring the purity and quality of the goat milk powder, etc.

[0051] In other specific embodiments, the upper protruding rectangular portion of the bag body 100 is further provided with a straight tear-off opening 131 and a tear-off line 132 to facilitate tearing of the milk powder packaging bag. In actual use, the milk powder packaging bag seal can be easily torn open along the straight tear-off opening 131, and the opening is flush and neat. This not only makes it convenient for consumers to easily open the packaging bag and prevents the contents of the bag from spilling when opening, but also reduces packaging costs by replacing the plastic spout structure.

[0052] In some other embodiments, the internal accommodating space of the upper protruding rectangular portion of the bag body 100 is further shaped as a perfect cone, such as... Figure 3 As shown. When filling goat milk powder and other products, the conical structure, which is smaller at the top and larger at the bottom, can simultaneously achieve the effect of the filling port fitting the filling tube and smooth filling.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A composite film for milk powder packaging, characterized in that, From bottom to top, they include: A heat-sealing layer, wherein the heat-sealing layer is a high-strength PE film layer; A first adhesive layer is formed on the heat-sealing layer, and the first adhesive layer is a solvent-free two-component polyurethane adhesive layer. An intermediate layer is formed on the first adhesive layer, and the intermediate layer is a BOPA-reinforced aluminum-plated film layer; A second adhesive layer is formed on the intermediate layer, and the second adhesive layer is a solvent-free two-component polyurethane adhesive layer; and A printed layer is formed on the second adhesive layer, wherein the printed layer is a BOPET film layer; The optical density value of the aluminum-plated layer in the intermediate layer is 2.8 to 3.

2.

2. The composite film for milk powder packaging according to claim 1, characterized in that, The thickness of the heat-sealing layer ranges from 40 to 60 micrometers.

3. The composite film for milk powder packaging according to claim 1, characterized in that, The thickness of the intermediate layer ranges from 15 to 25 micrometers.

4. The composite film for milk powder packaging according to claim 1, characterized in that, The thickness of the printed layer ranges from 12 to 25 micrometers.

5. The composite film for milk powder packaging according to claim 1, characterized in that, The thicknesses of the first adhesive layer and the second adhesive layer range from 1.5 to 2.0 micrometers, respectively.

6. A milk powder packaging bag, which can be used for packaging goat milk powder, characterized in that, The milk powder packaging bag uses the composite film for milk powder packaging as described in any one of claims 1 to 5.

7. A milk powder packaging bag, which can be used for packaging goat milk powder, characterized in that, The milk powder packaging bag includes at least a bag body and a spout or clip connected to the bag body, wherein the bag body is made of a composite film for milk powder packaging as described in any one of claims 1 to 5.

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