Composite membrane material for barrier packaging

Abstract

The utility model discloses a barrier packaging composite membrane material which comprises a first polyurethane glue layer, a second polyurethane glue layer, a two-way stretching polyethylene membrane layer, a heat-sealable polyethylene membrane layer and a polyvinyl alcohol water-based oxygen barrier coating, and the first polyurethane glue layer and the second polyurethane glue layer are arranged on the two sides of the two-way stretching polyethylene membrane layer respectively. The heat-sealable polyethylene film layer is arranged on the second polyurethane glue layer, the polyvinyl alcohol water-based oxygen barrier coating is arranged on the second polyurethane glue layer, and the polyvinyl alcohol water-based oxygen barrier coating contains one or more of inorganic nanoparticles, nanocellulose or plant fibers. The membrane material has the following beneficial effects that the membrane material has good barrier property and sealing property when being used as a packing material, particles prepared during recycling do not contain aluminum, and recycling of the packing material is facilitated.

Description

Technical Field

[0001] The utility model relates to the field of packaging materials, in particular to a barrier packaging composite film material. Background Art

[0002] Composite packaging film is a commonly used packaging material. Patent announcement document CN218966362U discloses a multi-layer packaging composite film composed of multiple films. In order to ensure the sealing and barrier properties of this composite film, aluminum film is used for compounding. Due to the use of aluminum film, this packaging material contains aluminum in the particles when it is recycled and re-granulated, which is not conducive to the recycling and reuse of the packaging material. Utility Model Content

[0003] In view of the above problems, the utility model provides a barrier packaging composite film material.

[0004] The technical solution adopted by the utility model is as follows:

[0005] A barrier packaging composite film material comprises a first polyurethane glue layer, a second polyurethane glue layer, a biaxially oriented polyethylene film layer, a heat-sealable polyethylene film layer, and a polyvinyl alcohol water-based oxygen barrier coating. The first polyurethane glue layer and the second polyurethane glue layer are respectively arranged on both sides of the biaxially oriented polyethylene film layer, the heat-sealable polyethylene film layer is arranged on the second polyurethane glue layer, the polyvinyl alcohol water-based oxygen barrier coating is arranged on the second polyurethane glue layer, and the polyvinyl alcohol water-based oxygen barrier coating contains one or more of inorganic nanoparticles, nanocellulose or plant fibers.

[0006] This composite film material is composited with a first polyurethane glue layer, a second polyurethane glue layer, a biaxially oriented polyethylene film layer (BOPE for short in English), a heat-sealable polyethylene film layer (CPE for short in English) and a polyvinyl alcohol (PVA for short) water-based oxygen barrier coating. The barrier property and sealing property are mainly provided by the polyvinyl alcohol water-based oxygen barrier coating, and the glue layer, the biaxially oriented polyethylene film layer and the heat-sealable polyethylene film layer can all provide certain barrier property and sealing property. Therefore, this composite film material has good barrier property and sealing property when used as a packaging material. The urethane glue layer and the polyvinyl alcohol water-based oxygen barrier coating do not affect recycling and re-granulation. The particles prepared for recycling and reuse do not contain aluminum, which is beneficial to the recycling and reuse of packaging materials.

[0007] Optionally, it also includes a surface film layer, which is arranged on the polyvinyl alcohol water-based oxygen-barrier coating, and the surface film layer and the first polyurethane glue layer are respectively located on both sides of the polyvinyl alcohol water-based oxygen-barrier coating.

[0008] Optionally, the surface film layer is a uniaxially oriented polyethylene film layer (MDOPE for short) or a biaxially oriented polyethylene film layer.

[0009] The specific surface film layer is a single corona uniaxially stretched polyethylene film layer or a single corona biaxially stretched polyethylene film layer. When the surface film layer is a single corona uniaxially stretched polyethylene film layer, its corona value is 38-42 dynes.

[0010] Optionally, the thickness of the surface film layer is 20u to 50u.

[0011] Optionally, the thickness of the polyvinyl alcohol water-based oxygen barrier coating is 1u to 5u.

[0012] Optionally, it further comprises a graphic information layer, wherein the graphic information layer is arranged between the first polyurethane glue layer and the polyvinyl alcohol water-based oxygen barrier coating, and the thickness of the graphic information layer is 1u to 3u.

[0013] The specific graphic information layer is set on the polyvinyl alcohol water-based oxygen barrier coating by gravure printing. The multi-level complex graphics and multi-layer structure of gravure printing provide good mechanical properties, and the high stiffness gives the packaging good display properties.

[0014] Optionally, the thickness of the biaxially oriented polyethylene film layer is 20u to 30u.

[0015] Specifically, the biaxially stretched polyethylene film layer located between the first polyurethane glue layer and the second polyurethane glue layer is the middle layer, and the biaxially stretched polyethylene film layer is a double-sided corona biaxially stretched polyethylene film layer, and its corona value is 38-42 dynes.

[0016] Optionally, the thickness of the heat-sealable polyethylene film layer is 50u-100u.

[0017] The corona value of the specific heat-sealable polyethylene film layer is 40 dynes.

[0018] The utility model has the beneficial effects of having good barrier properties and sealing properties when used as a packaging material, and does not contain aluminum in the prepared particles when suitable for recycling and reuse, which is beneficial to the recycling and reuse of the packaging material. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of barrier packaging composite film.

[0020] The reference numerals in the figure are: 1. surface film layer; 2. polyvinyl alcohol water-based oxygen barrier coating; 3. graphic information layer; 4. first polyurethane glue layer; 5. biaxially oriented polyethylene film layer; 6. second polyurethane glue layer; 7. heat-sealable polyethylene film layer. DETAILED DESCRIPTION

[0021] The utility model is described in detail below in conjunction with the accompanying drawings.

[0022] As attached Figure 1As shown, a barrier packaging composite film material includes a first polyurethane glue layer 4, a second polyurethane glue layer 6, a biaxially oriented polyethylene film layer 5 (specifically, the thickness of the biaxially oriented polyethylene film layer 5 is 20u-30u, and the biaxially oriented polyethylene film layer 5 is a double-sided corona biaxially oriented polyethylene film layer 5, and its corona value is 38-42 dynes), a heat-sealable polyethylene film layer 7, and a polyvinyl alcohol water-based oxygen barrier coating 2. The first polyurethane glue layer 4 and the second polyurethane glue layer 6 are respectively arranged on both sides of the biaxially oriented polyethylene film layer 5, the heat-sealable polyethylene film layer 7 is arranged on the second polyurethane glue layer 6, the polyvinyl alcohol water-based oxygen barrier coating 2 is arranged on the second polyurethane glue layer 6, and the polyvinyl alcohol water-based oxygen barrier coating 2 contains one or more of inorganic nanoparticles, nanocellulose or plant fibers.

[0023] In this composite film material, a first polyurethane glue layer 4, a second polyurethane glue layer 6, a biaxially oriented polyethylene film layer 5 (BOPE in English), a heat-sealable polyethylene film layer 7 (CPE in English) and a polyvinyl alcohol (PVA) water-based oxygen barrier coating are used to composite the barrier and sealing properties. The barrier and sealing properties are mainly provided by the polyvinyl alcohol water-based oxygen barrier coating 2, and the glue layer, the biaxially oriented polyethylene film layer 5 and the heat-sealable polyethylene film layer 7 can all provide certain barrier and sealing properties. Therefore, this composite film material has good barrier and sealing properties when used as a packaging material. The urethane glue layer and the polyvinyl alcohol water-based oxygen barrier coating 2 do not affect recycling and re-granulation. The particles prepared for recycling and reuse do not contain aluminum, which is beneficial to the recycling and reuse of packaging materials.

[0024] Specifically, the first polyurethane glue layer and the second polyurethane glue layer in the membrane material can be single-component polyurethane glue or two-component polyurethane glue.

[0025] In the present film material, the thickness of the biaxially oriented polyethylene film layer 5 between the first polyurethane glue layer and the second polyurethane glue layer is preferably 25u.

[0026] As attached Figure 1 As shown, it also includes a surface film layer 1, which is arranged on the polyvinyl alcohol water-based oxygen-barrier coating 2. The surface film layer 1 and the first polyurethane glue layer 4 are respectively located on both sides of the polyvinyl alcohol water-based oxygen-barrier coating 2.

[0027] As attached Figure 1 As shown, the surface film layer 1 is a uniaxially oriented polyethylene film layer (MDOPE for short) or a biaxially oriented polyethylene film layer 5 .

[0028] Specifically, the surface film layer 1 is a single corona uniaxially stretched polyethylene film layer or a single corona biaxially stretched polyethylene film layer 5. When the surface film layer 1 is a single corona uniaxially stretched polyethylene film layer, its corona value is 38-42 dynes.

[0029] As attached Figure 1 As shown, the thickness of the surface film layer 1 is 20u-50u, preferably 30u.

[0030] As attached Figure 1 As shown, the thickness of the polyvinyl alcohol water-based oxygen barrier coating 2 is 1u to 5u.

[0031] As attached Figure 1 As shown, it also includes a graphic information layer 3, which is arranged between the first polyurethane glue layer 4 and the polyvinyl alcohol water-based oxygen barrier coating 2, and the thickness of the graphic information layer 3 is 1u to 3u.

[0032] Specifically, the graphic information layer 3 is disposed on the polyvinyl alcohol water-based oxygen barrier coating 2 by gravure printing. The multi-level complex graphics and multi-layer structure of the gravure printing provide good mechanical properties, and the high stiffness gives the package good display properties.

[0033] As attached Figure 1 As shown, the thickness of the heat-sealable polyethylene film layer 7 is 50u-100u, preferably 60u.

[0034] Specifically, the corona value of the heat-sealable polyethylene film layer 7 is 40 dynes.

[0035] According to actual measurements, the water vapor transmission rate (WVTR) of this film is less than 2; the oxygen transmission rate (OTR) is less than 1.5, so it has excellent gas barrier and water vapor barrier properties.

[0036] In this film material, the PE material content is greater than 90%, so this film material can be regarded as a single PE film material and is easy to recycle.

[0037] The above description is only a preferred embodiment of the present invention, and does not limit the patent protection scope of the present invention. Any equivalent transformations made using the contents of the present invention specification, directly or indirectly used in other related technical fields, are also included in the protection scope of the present invention.

Claims

1. A barrier packaging composite film material, characterized in that: It includes a first polyurethane glue layer, a second polyurethane glue layer, a biaxially oriented polyethylene film layer, a heat-sealable polyethylene film layer, and a polyvinyl alcohol water-based oxygen-barrier coating. The first polyurethane glue layer and the second polyurethane glue layer are respectively arranged on both sides of the biaxially oriented polyethylene film layer, the heat-sealable polyethylene film layer is arranged on the second polyurethane glue layer, and the polyvinyl alcohol water-based oxygen-barrier coating is arranged on the second polyurethane glue layer.

2. The barrier packaging composite film material according to claim 1, characterized in that: It also includes a surface film layer, which is arranged on the polyvinyl alcohol water-based oxygen-barrier coating. The surface film layer and the first polyurethane glue layer are respectively located on both sides of the polyvinyl alcohol water-based oxygen-barrier coating.

3. The barrier packaging composite film material according to claim 2, characterized in that: The surface film layer is a uniaxially stretched polyethylene film layer or a biaxially stretched polyethylene film layer.

4. The barrier packaging composite film material according to claim 2, characterized in that: The thickness of the surface film layer is 20u-50u.

5. The barrier packaging composite film material according to claim 1, characterized in that: The thickness of the polyvinyl alcohol water-based oxygen barrier coating is 1u to 5u.

6. The barrier packaging composite film material according to claim 1, characterized in that: It also includes a graphic information layer, which is arranged between the first polyurethane glue layer and the polyvinyl alcohol water-based oxygen-barrier coating, and the thickness of the graphic information layer is 1u to 3u.

7. The barrier packaging composite film material according to claim 1, characterized in that: The thickness of the biaxially oriented polyethylene film layer is 20u-30u.

8. The barrier packaging composite film material according to claim 1, characterized in that: The thickness of the heat-sealable polyethylene film layer is 50u-100u.

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