Puncture-resistant linear easy-to-tear composite film for tea packaging and tea packaging bag

Abstract

The utility model relates to the technical field of film materials for tea packaging, in particular to a puncture-resistant linear easy-to-tear composite film for tea packaging and a tea packaging bag. The puncture-resistant linear easy-to-tear composite film layer structure for tea packaging comprises a heat-seal PE (polyethylene) film layer, a solvent-free two-component polyurethane glue bonding layer and a puncture-resistant linear easy-to-tear composite film layer, the puncture-resistant linear easy-to-tear composite film layer comprises an aluminized biaxial stretching nylon film layer, a kraft paper printing layer, a matt biaxial stretching nylon film layer and two moisture reaction type hot melt adhesive layers, the aluminized biaxial stretching nylon film layer has excellent linear easy-to-tear performance, and the matt biaxial stretching nylon film layer has excellent puncture resistance; the problem that a tea packaging film material which is resistant to tea stem puncture and easy to tear in a straight line is lacked in the tea packaging market is comprehensively solved. In addition, the tea packaging bag made of the puncture-resistant linear easy-to-tear composite film for tea packaging further has the effects of being vivid in printing color, antibacterial and fresh-keeping.

Description

Technical Field

[0001] The utility model relates to the technical field of film materials for tea packaging, in particular to a puncture-resistant linear easy-tear composite film for tea packaging and a tea packaging bag. Background Art

[0002] Tea originates from China, and its health benefits to the human body are being recognized by more and more people. Green tea is a type of tea that has not been fermented and retains more natural substances and nutrients. Green tea contains hundreds of compounds, some of which are necessary for the human body, such as vitamins, proteins, amino acids, sugars and mineral elements. They have high nutritional value to the human body and can help refresh the mind, reduce inflammation and sterilize, detoxify and sober up, and lower blood lipids and blood pressure.

[0003] The main structures of materials currently used to make green tea packaging bags on the market include BOPP / AL / PE, BOPP / VMPET / PE, KPET / PE, etc., and none of the three structures have the function of being easy to tear in a straight line. When the package is opened, tea leaves may easily fall out due to uneven tearing. Moreover, the three structures do not have excellent puncture resistance and the packaging bags may be easily punctured by sharp structures such as tea stems. In addition, the surfaces of the three structures are all set as transparent film layers with bright surfaces, but the colors presented after printing are not obvious and lack texture. Furthermore, since KPET / PE contains PVDC coating, dioxins will be produced when incinerated, which is not conducive to environmental protection.

[0004] It can be seen that the current tea packaging market still lacks a tea packaging film material that is resistant to tea stem puncture and has a linear and easy-tear function. Utility Model Content

[0005] In order to solve the problem of the lack of tea packaging film materials that are resistant to tea stem puncture and easy to tear in a straight line in the tea packaging market, the utility model provides a puncture-resistant, straight-line, easy-tear composite film for tea packaging. The film layer structure includes a heat-sealed PE film layer, an adhesive layer, and a puncture-resistant, straight-line, easy-tear composite film layer arranged in sequence from bottom to top;

[0006] The puncture-resistant linear tearable composite film layer includes an aluminum-plated biaxially oriented nylon film layer, a first hot melt adhesive layer, a printing layer, a second hot melt adhesive layer and a matte biaxially oriented nylon film layer, which are sequentially arranged from bottom to top.

[0007] In one embodiment, the heat-sealing PE film layer is a high-strength PE film with a thickness of 45-85 μm.

[0008] In one embodiment, the adhesive layer is a solvent-free two-component polyurethane glue with a thickness of 1-2 μm.

[0009] In one embodiment, the thickness of the aluminum-plated biaxially oriented nylon film layer is 15-25 μm.

[0010] In one embodiment, the optical density of the aluminum-plated biaxially oriented nylon film layer is 2-2.5.

[0011] In one embodiment, the printing layer is made of kraft paper with a gram weight of 30-60 g / m 2 .

[0012] In one embodiment, the matte biaxially oriented nylon film layer has a thickness of 15-25 μm.

[0013] In one embodiment, the first hot melt adhesive layer and the second hot melt adhesive layer are both moisture-reactive hot melt adhesives, and both have a thickness of 2-2.5 μm.

[0014] The utility model also provides a tea packaging bag, the bag body of which is made of the puncture-resistant linear easy-tear composite film for tea packaging as described in any one of the above items.

[0015] In one embodiment, two ends of the bag body are provided with tear-away notches, and the opening direction of the tear-away notches is consistent with the linear tearing direction of the puncture-resistant linear tear-away composite film layer.

[0016] Compared with the prior art, the utility model provides a puncture-resistant linear easy-tear composite film for tea packaging, the film layer structure of which includes a puncture-resistant linear easy-tear composite film layer, and the puncture-resistant linear easy-tear composite film layer includes an aluminized biaxially oriented nylon film layer (aluminum-plated BOPA film layer). It not only has excellent linear easy-tear performance, which can solve the problem of tea falling out due to uneven tearing when opening the tea packaging, but also can effectively block oxygen and water, and has the additional effect of preserving the quality and freshness of tea.

[0017] Compared with the existing technology, the puncture-resistant linear easy-tear composite film for tea packaging provided by the utility model comprises a matte biaxially oriented nylon film layer (matte BOPA film layer) in the film layer structure, which has excellent puncture resistance and can solve the problem of tea packaging being punctured by sharp structures such as tea stems. In addition, the matte BOPA film can retain the color saturation and vividness of the printed layer pattern to a greater extent, making the printed pattern more realistic and more textured, and the packaging bags made therefrom can enrich the appearance of traditional packaging.

[0018] Compared with the prior art, the puncture-resistant linear easy-tear composite film for tea packaging provided by the present invention has a printing layer with a gram weight of 30-60 g / m 2The kraft paper not only has excellent printing effect, but also has good drop resistance and material stiffness. It can be made into tea packaging bags to reduce the generation of tea dust during tea packaging and transportation.

[0019] Compared with the existing technology, the puncture-resistant straight-line easy-tear composite film for tea packaging provided by the utility model includes a heat-sealed PE film layer in the film layer structure. High-strength PE film is specially used. It has high strength, high toughness and good heat-sealing properties, and also has excellent antibacterial properties. It is used in the packaging and production of unfermented green tea, and can effectively lock the freshness of green tea and ensure the flavor of tea.

[0020] Compared with the prior art, the puncture-resistant, linear, and easy-to-tear composite film for tea packaging provided by the present invention has an adhesive layer in the film structure that specifically uses solvent-free two-component polyurethane glue, which is environmentally friendly and does not produce solvent residue.

[0021] Compared with the prior art, the tea packaging bag provided by the present invention is made of a puncture-resistant straight-line easy-tear composite film for tea packaging. Easy-tear notches are provided at both ends of the bag body. The opening direction of the easy-tear notch is consistent with the linear tearing direction of the puncture-resistant straight-line easy-tear composite film for tea packaging. When tearing open the package, the opening tear can be ensured to be neat and easy to tear, thereby reducing tea leaves from falling. In addition, the puncture-resistant straight-line easy-tear composite film for tea packaging also has the characteristics of resisting tea stem puncture, preserving quality and locking freshness, and printing with bright colors. The tea packaging bag prepared has good effects of resisting tea stem puncture and preserving tea leaves, and the printing color is bright, which enriches the printing layering of the tea packaging bag.

[0022] Other features and beneficial effects of the present invention will be described in the following description, and some of the technical features and beneficial effects can be obviously derived from the description or understood by implementing the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 A schematic diagram of the structure of a puncture-resistant, linear, easy-to-tear composite film for tea packaging provided by an embodiment of the present utility model;

[0025] Figure 2 This is a schematic diagram of the appearance of a tea packaging bag provided in an embodiment of the utility model.

[0026] Reference numerals:

[0027] DETAILED DESCRIPTION

[0028] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0029] In the description of this utility model, it should be noted that the terms "upper," "lower," "both ends," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on 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.

[0030] The utility model embodiment provides a puncture-resistant straight-line easy-tear composite film for tea packaging, Figure 1 As shown, the film layer structure includes a heat-sealing PE film layer 110, an adhesive layer 120 and a puncture-resistant linear tearable composite film layer 130 arranged in sequence from bottom to top;

[0031] Among them, the puncture-resistant linear easy-tear composite film layer 130 includes an aluminized biaxially oriented nylon film layer (aluminized BOPA film layer) 131, a first hot melt adhesive layer 132, a printing layer 133, a second hot melt adhesive layer 134 and a matte biaxially oriented nylon film layer (matte BOPA film layer) 135, which are arranged in sequence from bottom to top.

[0032] In this embodiment, further, the heat-sealing PE film layer 110 is a high-strength PE film with a thickness of 45 to 85 μm;

[0033] When used specifically, the high-strength PE film can improve the strength and toughness of the film structure, and provide good heat sealing properties to meet the sealing requirements when using tea packaging bags. It also has excellent antibacterial properties and can effectively lock in the freshness of green tea and ensure the flavor of tea.

[0034] In this embodiment, further, the adhesive layer 120 is a solvent-free two-component polyurethane glue with a thickness of 1 to 2 μm;

[0035] When used, the solvent-free two-component polyurethane glue is environmentally friendly, and since no solvent is added, no solvent residue will be produced, which will affect the flavor of the tea.

[0036] In this embodiment, further, the thickness of the aluminum-plated BOPA film layer 131 is 15-25 μm;

[0037] When used specifically, the aluminized BOPA film layer has excellent linear tearing properties, which can solve the problem of tea falling out due to uneven tearing when opening the tea package.

[0038] In this embodiment, further, the optical density of the aluminum-plated BOPA film layer 131 is 2 to 2.5;

[0039] In specific use, the aluminum-plated BOPA film also has the properties of oxygen and water barrier, which can ensure the quality and freshness of tea.

[0040] In this embodiment, the printing layer 133 is made of kraft paper with a gram weight of 30-60 g / m 2 ;

[0041] In specific use, kraft paper has excellent printing effects, good drop resistance and material stiffness. It can be made into tea packaging bags for use, which can reduce the generation of tea dust during tea packaging and transportation.

[0042] In this embodiment, further, the matt BOPA film layer 135 has a thickness of 15 to 25 μm;

[0043] When used specifically, the matte BOPA film layer has excellent puncture resistance, which can solve the problem of tea packaging being punctured by sharp structures such as tea stems. In addition, the matte BOPA film layer can retain the saturation and vividness of the color of the printed layer pattern to a greater extent. Combined with the excellent printing effect of the kraft paper specially used in the printing layer, it further makes the printed pattern more realistic and has a better texture. The packaging bags made of it can enrich the appearance of traditional packaging.

[0044] In this embodiment, further, the first hot melt adhesive layer 132 and the second hot melt adhesive layer 134 are both moisture-reactive hot melt adhesives, and the thickness of each is 2-2.5 μm;

[0045] When used specifically, moisture-reactive hot melt adhesive is biodegradable and is an environmentally friendly adhesive material.

[0046] In this embodiment, a biodegradable moisture-reactive hot melt adhesive is used to sequentially bond aluminized BOPA film, kraft paper, and matte BOPA film to form a puncture-resistant, linear, and easy-tear composite film layer. The puncture-resistant, linear, and easy-tear composite film layer is further composited with a heat-sealed PE film using a solvent-free two-component polyurethane glue. The advantages of each layer of film are fully utilized and coordinated to enhance the puncture-resistant, linear, and easy-tear composite film for tea packaging. This film has strong puncture resistance and can be torn linearly. This also solves the problems of poor printing color and insufficient layering of traditional packaging film materials, further improves the antibacterial, oxygen barrier, and water barrier properties of the composite film for tea packaging, and has environmentally friendly benefits.

[0047] In this embodiment, preferably, the heat-sealable PE film layer 110 is a high-strength PE film obtained by a high-strength PE film and a preparation method thereof disclosed in patent document CN117551294A, and has a thickness of 70 μm.

[0048] In this embodiment, preferably, the adhesive layer 120 is made of solvent-free two-component polyurethane glue produced by Shanghai Kangda Chemical New Materials Co., Ltd., with a model number of WD8118A / B and a thickness of 1 μm.

[0049] In this embodiment, preferably, the aluminized BOPA film layer 131 is an aluminized BOPA film obtained by a linear easy-tear aluminized nylon film and a preparation method thereof disclosed in patent document CN111516334B, and has a thickness of 15 μm.

[0050] In this embodiment, preferably, the printing layer 133 is made of food-grade kraft paper produced by Dongguan Jiali Industrial Investment Co., Ltd., with a gram weight of 45 g / m 3 .

[0051] In this embodiment, preferably, the matte BOPA film layer 135 is a matte BOPA film obtained by using the scratch-resistant and high-temperature-resistant matte BOPA pre-coating film and its preparation method disclosed in patent document CN111909413A, with a thickness of 15 μm.

[0052] In this embodiment, preferably, the first hot melt adhesive layer 132 and the second hot melt adhesive layer 134 are made of moisture-reactive hot melt adhesive obtained by a preparation method of a biodegradable moisture-reactive hot melt adhesive disclosed in patent document with publication number CN103555254A, and the thickness of each is 2 μm.

[0053] It should be noted that the heat-seal PE film layer 110, the adhesive layer 120, the aluminized biaxially oriented nylon film layer 131 (aluminized BOPA film layer 131), the first hot melt adhesive layer 132, the printed layer 133, the second hot melt adhesive layer 134 and the matte biaxially oriented nylon film layer 135 (matte BOPA film layer 135) are all existing materials that can be obtained by those skilled in the art.

[0054] The present invention also provides a tea packaging bag. Figure 2 As shown, the bag body 100 is made of the puncture-resistant linear easy-tear composite film for tea packaging described in Example 1.

[0055] In this embodiment, further, a tear notch 101 is provided at the top of the bag body 100 , and the opening direction of the tear notch 101 is consistent with the linear tearing direction of the puncture-resistant linear tearable composite film layer 130 .

[0056] In this example, the tea packaging bags were further tested for drop resistance, puncture resistance, oxygen transmission rate, and water vapor transmission rate in accordance with GB / T 10004-2008 Plastic composite films for packaging, dry lamination of bags, and extrusion lamination, ASTM F1927-20 Standard Test Method for Oxygen Transmission Rate, Permeability, and Permeability at Controlled Relative Humidity Through Barrier Materials Using a Coulometric Detector, and GB / T 21529-2008 Plastic Film and Sheeting—Determination of Water Vapor Transmission Rate—Electrolytic Sensor Method. Furthermore, film sheets from the tea packaging bags were tested for linear tear resistance. The test results are shown in Table 1.

[0057] Table 1 Performance test results of tea packaging bags made of puncture-resistant linear easy-tear composite film for tea packaging

[0058]

[0059] According to the performance test results of the tea packaging bags in Table 1, the tea packaging bags provided in this embodiment have excellent drop resistance. In terms of puncture resistance, they can withstand a maximum puncture strength of 80 N, which is sufficient to effectively prevent tea stems from being punctured. At the same time, they also have excellent oxygen and water barrier properties, which can prevent oxygen and water vapor from entering the tea packaging bag and causing the tea to deteriorate, discolor, and change its taste, thereby extending the shelf life. In particular, they also have excellent linear tearing properties, which can prevent the tea leaves from falling due to uneven tearing after the package is torn from the tearing edge.

[0060] In this embodiment, the tea packaging bag body is made by adopting the puncture-resistant linear easy-tear composite film for tea packaging provided by the utility model, so that the tea packaging bag has the performance of resisting tea stem puncture, and is convenient for straight-line tearing with the use of easy-tear notches, and is not likely to cause tea to fall due to uneven tearing. It also has the comprehensive beneficial effects of rich printing colors, good tea freshness locking and environmental friendliness.

[0061] In addition, the puncture-resistant linear easy-tear composite film for tea packaging provided by the present invention can also be used locally or entirely inside a packaging bag.

[0062] Although terms such as puncture resistance and linear tearing are frequently used in this document, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A puncture-resistant, linear, easy-tear composite film for tea packaging, characterized by: The film layer structure comprises a heat-sealing PE film layer (110), an adhesive layer (120), and a puncture-resistant linear easy-tear composite film layer (130) arranged in sequence from bottom to top; The puncture-resistant linear tearable composite film layer (130) comprises an aluminum-plated biaxially oriented nylon film layer (131), a first hot melt adhesive layer (132), a printing layer (133), a second hot melt adhesive layer (134), and a matte biaxially oriented nylon film layer (135) arranged in sequence from bottom to top.

2. The puncture-resistant, linear, easy-tear composite film for tea packaging according to claim 1, characterized in that: The heat-sealing PE film layer (110) is a high-strength PE film with a thickness of 45-85 μm.

3. The puncture-resistant, linear, easy-tear composite film for tea packaging according to claim 1, characterized in that: The adhesive layer (120) is a solvent-free two-component polyurethane glue with a thickness of 1-2 μm.

4. The puncture-resistant, linear, easy-tear composite film for tea packaging according to claim 1, characterized in that: The thickness of the aluminum-plated biaxially oriented nylon film layer (131) is 15-25 μm.

5. The puncture-resistant, linear, easy-tear composite film for tea packaging according to claim 4, characterized in that: The aluminized biaxially oriented nylon film layer (131) has an aluminized optical density of 2 to 2.

5.

6. The puncture-resistant, linear, easy-tear composite film for tea packaging according to claim 1, characterized in that: The printing layer (133) is made of kraft paper with a gram weight of 30-60 g / m 2 .

7. The puncture-resistant, linear, easy-tear composite film for tea packaging according to claim 1, characterized in that: The matte biaxially oriented nylon film layer (135) has a thickness of 15 to 25 μm.

8. The puncture-resistant, linear, easy-tear composite film for tea packaging according to claim 1, characterized in that: The first hot melt adhesive layer (132) and the second hot melt adhesive layer (134) are both moisture-reactive hot melt adhesives, and both have a thickness of 2 to 2.5 μm.

9. A tea packaging bag, characterized by: The bag body (100) is made of the puncture-resistant, linear, easy-to-tear composite film for tea packaging as described in any one of claims 1 to 8.

10. The tea packaging bag according to claim 9, characterized in that: Both ends of the bag body (100) are provided with easy-tear notches (101), and the opening direction of the easy-tear notches (101) is consistent with the linear tearing direction of the puncture-resistant linear easy-tear composite film layer (130).

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