A whitening barrier mask bag

Abstract

This utility model discloses a whitening barrier mask bag, relating to the packaging field. The whitening barrier mask bag comprises, from the outside to the inside, a printing layer, an ink layer, a first adhesive layer, a whitening barrier layer, a second adhesive layer, and a heat-sealing layer; the printing layer is a biaxially oriented polypropylene film; the heat-sealing layer is a cast polypropylene material; the whitening barrier layer comprises, from top to bottom, a milky white polypropylene substrate and an aluminum-plated layer, the milky white polypropylene substrate being a milky white biaxially oriented polypropylene film. The whitening barrier mask bag of this utility model not only has excellent whitening effect and barrier performance but also good processing performance and is easy to recycle.

Description

Technical Field

[0001] This utility model relates to the field of packaging technology, specifically to a whitening barrier mask bag. Background Technology

[0002] The whiteness of facial mask pouch packaging is extremely important. Traditional whitening methods mainly rely on printing with concentrated white ink and using composite low-density pearlescent polypropylene (PP) film. The former is not very effective, while the latter is produced using a foaming process, resulting in a low density (0.68~0.75 g / cm³). 3 It is not heat resistant, and the sealing edges are prone to shrinkage and deformation during bag making, resulting in a low yield rate. Increasing the density of traditional pearlescent PP will reduce its foaming effect and whiteness.

[0003] In addition, traditional high-barrier face mask bags are mostly made of aluminum foil or aluminized polyethylene terephthalate (PET) material. Aluminum foil is expensive, and aluminized PET is not easy to tear. Both are composite structures and cannot be recycled, which does not conform to the current environmental protection trend.

[0004] Therefore, there is an urgent need for a mask bag structure that can simultaneously meet the requirements of high whiteness, high barrier properties, easy tearing, easy processing, and recyclability. Summary of the Invention

[0005] In order to solve the problems existing in the prior art, the purpose of this utility model is to provide a whitening barrier mask bag with a novel structure, which has excellent whitening effect, high barrier properties, good processing performance and is recyclable.

[0006] This utility model provides the following technical solution: This utility model provides a whitening barrier mask bag, which includes, from the outside to the inside, a printing layer, an ink layer, a first adhesive layer, a whitening barrier layer, a second adhesive layer, and a heat-sealing layer; the printing layer is a biaxially oriented polypropylene film; the heat-sealing layer is a cast polypropylene material; the whitening barrier layer includes, from top to bottom, a milky white polypropylene substrate and an aluminum-plated layer, wherein the milky white polypropylene substrate is a milky white biaxially oriented polypropylene film.

[0007] Furthermore, the density of the milky white polypropylene substrate is 0.89~0.91 g / cm³. 3 .

[0008] Furthermore, the printed layer is a transparent biaxially oriented polypropylene film with a density of 0.89~0.91 g / cm³. 3 Its thickness is 15-40 micrometers.

[0009] Furthermore, the ink layer is a polyurethane ink layer with a thickness of 1-5 micrometers.

[0010] Preferably, the ink layer is prepared by gravure printing or flexographic printing.

[0011] Preferably, the first adhesive layer and / or the second adhesive layer are polyurethane adhesive layers with a thickness of 1 to 5 micrometers.

[0012] Preferably, the first adhesive layer and / or the second adhesive layer are polypropylene resin adhesive layers with a thickness of 10-15 micrometers.

[0013] Furthermore, the thickness of the whitening barrier layer is 30-50 micrometers.

[0014] Furthermore, the preparation method of the milky white biaxially oriented polypropylene film includes the following steps: adding a milky white material to the polypropylene raw material and mixing it evenly to obtain a milky white polypropylene raw material, and then using a biaxial stretching process to make a film.

[0015] Preferably, the milky white material accounts for 5% to 15% of the mass of the milky white polypropylene raw material.

[0016] Furthermore, the thickness of the aluminum plating layer is 0.03~0.05 micrometers.

[0017] Furthermore, the whiteness of the whitening barrier layer is not less than 75.

[0018] Furthermore, the density of the heat-sealing layer is 0.89~0.91 g / cm³. 3 Its thickness is 50~100 micrometers.

[0019] Through the above design scheme, the beneficial effects of this utility model are: This invention uses biaxially oriented polypropylene (BOPP) film as the printing layer, cast polypropylene as the heat-sealing layer, and milky white BOPP film as the milky white polypropylene substrate. This ensures the density remains consistent with conventional polypropylene, forming a high-density milky white polypropylene substrate. This maintains whiteness while improving thermal stability, resulting in stable sealing dimensions and a high yield rate when used in bag making. An aluminum-plated layer is prepared on the surface of the milky white polypropylene substrate, providing excellent barrier properties and effectively protecting the contents of the whitening barrier mask bag. Furthermore, since the printing layer, heat-sealing layer, and barrier layer are all made of polypropylene and do not contain other plastic materials, they can be directly recycled into the PP plastic recycling stream without separation, offering significant environmental advantages. Simultaneously, the PP structure is softer and easier to tear than structures containing PET or polyamide (PA), improving the user experience. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments 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 schematic diagram of the layered structure of the whitening barrier mask bag provided in Embodiment 1 of this utility model.

[0022] Explanation of the markings in the image: 1-Printing layer; 2-Ink layer; 3-First adhesive layer; 4-Whitening barrier layer; 5-Second adhesive layer; 6-Heat-sealing layer. Detailed Implementation

[0023] The technical solution of this utility model will be clearly and completely described below with reference to its embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0025] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of 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.

[0027] Example 1 Please see Figure 1 The whitening barrier mask bag shown includes, from the outside to the inside, a printing layer 1, an ink layer 2, a first adhesive layer 3, a whitening barrier layer 4, a second adhesive layer 5, and a heat-sealing layer 6.

[0028] Printed layer 1 is a transparent biaxially oriented polypropylene film with a thickness of 18 micrometers and a density of 0.90 g / cm³. 3 .

[0029] Ink layer 2 is polyurethane ink with a thickness of 2 micrometers.

[0030] The first adhesive layer 3 uses a two-component polyurethane adhesive with a thickness of 1.5 micrometers.

[0031] The whitening barrier layer 4 consists of, from top to bottom, a milky white polypropylene substrate and an aluminum-plated layer (not shown in the figure). The milky white polypropylene substrate is a milky white biaxially oriented polypropylene film with a density of 0.90 g / cm³. 3 The thickness of the milky white biaxially oriented polypropylene film is 49.95 micrometers, and the thickness of the aluminum coating layer is 0.05 micrometers. Specifically, the preparation method of the milky white biaxially oriented polypropylene film includes the following steps: adding titanium dioxide at a weight of 10% of the total weight of the polypropylene raw material and mixing evenly to obtain a milky white polypropylene raw material, and then forming a film using a biaxial stretching process.

[0032] The second adhesive layer 5 uses a two-component polyurethane adhesive with a thickness of 1 micrometer.

[0033] The heat-sealing layer 6 is made of cast polypropylene with a density of 0.90 g / cm³. 3 The thickness is 50 micrometers.

[0034] The preparation process of the whitening barrier mask bag in this embodiment is as follows: 1) Polyurethane ink is printed using a gravure printing machine, and ink layer 2 is printed on printing layer 1 to obtain a polypropylene printed film; 2) A solvent-free lamination process is used; one side of the ink layer 2 of the polypropylene printed film is bonded to the non-aluminized side of the whitening barrier layer 4 using a two-component polyurethane adhesive, with an adhesive application rate of 1.5 g / m². 2 ; 3) Solvent-free lamination process for heat-sealing layer: The aluminum-plated layer of the composite semi-finished product of polypropylene printed film and whitening barrier layer 4 is bonded to the corona-exposed surface of heat-sealing layer 6 using a two-component polyurethane adhesive, with an adhesive application rate of 1.0 g / m². 2 ; 4) After curing at 40℃ for 36 hours, the two-component polyurethane adhesive is cured to form the first adhesive layer 3 and the second adhesive layer 5. 5) Use a three-side sealing bag making machine to make bags to obtain mask bags.

[0035] Example 2 The only difference between this embodiment and Embodiment 1 is the thickness and density of each layer, as detailed below: The thickness of printed layer 1 is 40 micrometers, and the density is 0.89 g / cm³. 3 .

[0036] The thickness of ink layer 2 is 5 micrometers.

[0037] The thickness of the first adhesive layer 3 is 5 micrometers.

[0038] The whitening barrier layer 4 consists of a milky white polypropylene substrate and an aluminum-coated layer from top to bottom. The milky white polypropylene substrate is a milky white biaxially oriented polypropylene film with a density of 0.89 g / cm³. 3 The thickness of the milky white biaxially oriented polypropylene film is 29.97 micrometers, and the thickness of the aluminum coating layer is 0.03 micrometers.

[0039] The thickness of the second adhesive layer 5 is 5 micrometers.

[0040] The density of heat-sealing layer 6 is 0.89 g / cm³. 3 The thickness is 100 micrometers.

[0041] Example 3 The only difference between this embodiment and Embodiment 1 is the thickness and density of each layer, as detailed below: The thickness of printed layer 1 is 15 micrometers, and the density is 0.91 g / cm³. 3 .

[0042] The thickness of ink layer 2 is 1 micrometer.

[0043] The thickness of the first adhesive layer 3 is 1 micrometer.

[0044] The whitening barrier layer 4 consists of a milky white polypropylene substrate and an aluminum-coated layer from top to bottom. The milky white polypropylene substrate is a milky white biaxially oriented polypropylene film with a density of 0.91 g / cm³. 3 The thickness of the milky white biaxially oriented polypropylene film is 39.96 micrometers, and the thickness of the aluminum coating layer is 0.04 micrometers.

[0045] The thickness of the second adhesive layer 5 is 5 micrometers.

[0046] The density of heat-sealing layer 6 is 0.91 g / cm³. 3 The thickness is 60 micrometers.

[0047] To further illustrate the technical effects of this utility model, a comparative example 1 is provided based on embodiment 1 as follows: Comparative Example 1 A mask bag differs from Example 1 only in that the printing layer is made of PET material, the whitening barrier layer is made of aluminized PET material, and the heat-sealing layer is made of PE material.

[0048] The whiteness and barrier properties of the mask bags from Example 1 and Comparative Example 1 were tested. The test results are shown in Table 1 below.

[0049] Table 1. Results of Whiteness and Barrier Tests It is evident that the whitening barrier mask bag of this invention can effectively whiten and improve barrier properties. At the same time, since the printing layer, heat-sealing layer and barrier layer are all made of polypropylene and do not contain other plastic materials, they can be directly recycled into the PP plastic recycling stream without separation, demonstrating significant environmental advantages.

[0050] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A whitening barrier mask bag, characterized in that, From the outside to the inside, it includes a printing layer, an ink layer, a first adhesive layer, a whitening barrier layer, a second adhesive layer, and a heat-sealing layer; the printing layer is a biaxially oriented polypropylene film; the heat-sealing layer is a cast polypropylene material; the whitening barrier layer includes a milky white polypropylene substrate and an aluminum-plated layer from top to bottom, and the milky white polypropylene substrate is a milky white biaxially oriented polypropylene film.

2. The whitening barrier mask bag as described in claim 1, characterized in that, The density of the milky white polypropylene substrate is 0.89~0.91 g / cm³. 3 .

3. The whitening barrier mask bag as described in claim 1, characterized in that, The printed layer is a transparent biaxially oriented polypropylene film with a density of 0.89~0.91 g / cm³. 3 Its thickness is 15-40 micrometers.

4. The whitening barrier mask bag as described in claim 1, characterized in that, The ink layer is a polyurethane ink layer with a thickness of 1 to 5 micrometers.

5. The whitening barrier mask bag as described in claim 1, characterized in that, The first adhesive layer and / or the second adhesive layer are polyurethane adhesive layers with a thickness of 1 to 5 micrometers.

6. The whitening barrier mask bag as described in claim 1, characterized in that, The first adhesive layer and / or the second adhesive layer are polypropylene resin adhesive layers with a thickness of 10-15 micrometers.

7. The whitening barrier mask bag as described in claim 1, characterized in that, The thickness of the whitening barrier layer is 30-50 micrometers.

8. The whitening barrier mask bag as described in claim 1, characterized in that, The thickness of the aluminum plating layer is 0.03~0.05 micrometers.

9. The whitening barrier mask bag as described in claim 1, characterized in that, The whiteness of the whitening barrier layer is not less than 75.

10. The whitening barrier mask bag as described in claim 1, characterized in that, The density of the heat-sealing layer is 0.89~0.91 g / cm³. 3 Its thickness is 50~100 micrometers.

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