High-toughness waterproof plastic packaging bag

Abstract

The utility model discloses a high-toughness waterproof plastic packaging bag, which relates to the technical field of packaging bags and comprises a bag layer forming a bag body with a closed inner cavity, the bag layer is formed by sequentially attaching a polyethylene layer, an ethylene-vinyl alcohol copolymer layer and a polypropylene layer, the polyethylene layer is in contact with the inner cavity, and the ethylene-vinyl alcohol copolymer layer is in contact with the polypropylene layer. The polyethylene layer, the ethylene-vinyl alcohol copolymer layer and the polypropylene layer are all transparent; the transparent packaging bag has the advantages that the bag layer is formed by sequentially attaching the polyethylene layer, the ethylene-vinyl alcohol copolymer layer and the polypropylene layer, the high-toughness and waterproof effects are provided, and the transparent packaging bag is transparent and suitable for the situation that transparent packaging display is needed; the polyvinylidene chloride layer is arranged on the surface of the polypropylene layer, so that the overall moisture resistance and oxygen resistance are remarkably improved; and the siloxane antifogging agent layer is arranged on the surface of the polyvinylidene chloride layer, so that the adhesion of water vapor and the generation of water mist can be reduced, and the effect of the transparent package can be maintained.

Description

Technical Field

[0001] The utility model relates to the technical field of packaging bags, and more specifically to a high-toughness waterproof plastic packaging bag. Background Art

[0002] Plastic packaging bags are made of plastic as raw materials and are used to produce various daily necessities. They are widely used in daily life and industrial production, but this temporary convenience brings long-term harm. Commonly used plastic packaging bags are mostly made of polyethylene film, which is non-toxic and can be used to hold food;

[0003] Existing plastic packaging bags (such as packaging potato chips, bread, etc.) need to be inflated when used. In order to enhance the effects of pressure resistance, moisture resistance, etc., it is necessary to provide toughness and waterproof functions (such as the publication number: CN202807328U, a nitrogen packaging bag);

[0004] The "pure aluminum film" used in the above-mentioned "nitrogen packaging bag" can provide a strong waterproof effect, but it is not transparent, which is not suitable for packaging bags that require transparent display (such as bread, etc.); at the same time, the existing (such as public (publication) number: CN212666894U, a polyolefin film for food packaging) although it is described as having "polypropylene layer, ethylene-vinyl alcohol copolymer layer, polyethylene layer", but does not propose the use of transparency. Therefore, it is necessary to propose a packaging bag suitable for transparent packaging display. Utility Model Content

[0005] The purpose of the utility model is to provide a high-toughness waterproof plastic packaging bag in order to solve the above technical problems.

[0006] In order to achieve the above-mentioned purpose, the utility model specifically adopts the following technical solutions:

[0007] The utility model proposes a high-toughness waterproof plastic packaging bag, including a bag layer constituting a bag body with a closed inner cavity, wherein the bag layer is composed of a polyethylene layer, an ethylene-vinyl alcohol copolymer layer and a polypropylene layer laminated in sequence, wherein the polyethylene layer contacts the inner cavity, and the polyethylene layer, the ethylene-vinyl alcohol copolymer layer and the polypropylene layer are all transparent:

[0008] As a preferred technical solution of the utility model, a polyvinylidene chloride layer is laminated and fixed to the outside of the polypropylene layer.

[0009] As a preferred technical solution of the utility model, the polyvinylidene chloride layer is transparent.

[0010] As a preferred technical solution of the utility model, a silicone antifogging agent layer is laminated and fixed on the outside of the polyvinylidene chloride layer.

[0011] As a preferred technical solution of the utility model, the silicone antifogging agent layer is transparent.

[0012] As a preferred technical solution of the utility model, the ethylene-vinyl alcohol copolymer layer is replaced by an aluminum foil layer.

[0013] The beneficial effects of the utility model are as follows:

[0014] The bag layer A is made by laminating a polyethylene layer 1, an ethylene vinyl alcohol copolymer layer 2 and a polypropylene layer 3 in sequence, providing high toughness and waterproof effects, and is transparent, and is suitable for use in situations where transparent packaging display is required;

[0015] A polyvinylidene chloride layer 4 is provided on the surface of the polypropylene layer 3 to significantly improve the overall moisture barrier and oxygen barrier performance;

[0016] The silicone antifogging agent layer 5 is provided on the surface of the polyvinylidene chloride layer 4 to reduce the adhesion of water vapor and the generation of water mist, so as to maintain the effect of transparent packaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model;

[0018] Figure 2 Is another schematic diagram of the structure of the utility model;

[0019] Figure 3 It is another structural schematic diagram of the utility model.

[0020] Reference numerals: bag layer-A, polyethylene layer-1, ethylene-vinyl alcohol copolymer layer-2, polypropylene layer-3, polyvinylidene chloride layer-4, silicone antifogging agent layer-5. DETAILED DESCRIPTION

[0021] Embodiment 1:

[0022] like Figure 1 As shown, this embodiment proposes: a high-toughness waterproof plastic packaging bag, including a bag layer A constituting a bag body with a closed inner cavity (the bag layer A is the wrapping layer of the packaging bag, and a space is reserved in the wrapping layer);

[0023] The bag layer A is composed of a polyethylene layer 1, an ethylene-vinyl alcohol copolymer layer 2 and a polypropylene layer 3 laminated in sequence;

[0024] The polyethylene layer 1 is provided to provide a safe and reliable material, which can ensure that no harmful substances migrate between packages, and has good moisture-proof performance to prevent moisture from penetrating into the food, thereby effectively protecting the quality and taste of the food, and has good toughness;

[0025] An (EVOH) ethylene-vinyl alcohol copolymer layer 2 is provided, which is a high barrier plastic material having excellent oxygen and water vapor barrier properties;

[0026] A polypropylene layer 3 is provided, which has excellent mechanical strength, wear resistance and tear resistance, and high-strength physical protection (such as providing necessary physical protection during inflation, transportation, storage and consumer use to ensure its structural integrity and not easy to be damaged);

[0027] The polyethylene layer 1 contacts the inner cavity, and the polyethylene layer 1, the ethylene-vinyl alcohol copolymer layer 2 and the polypropylene layer 3 are all transparent, so that the plastic packaging bag can be used in situations where transparent packaging (such as bread, etc.) is required for display.

[0028] Embodiment 2:

[0029] like Figure 2 As shown, the difference between it and embodiment 1 is that: it also includes that the polypropylene layer 3 is bonded and fixed with a polyvinylidene chloride layer 4, which can significantly improve the overall moisture barrier and oxygen barrier properties and enhance the waterproof property;

[0030] Polyvinylidene chloride layer 4 (PVDC): As a high-performance high-barrier material, it has a tight molecular structure and has a strong barrier effect on water vapor and oxygen. It can be attached to the surface of the polypropylene layer 3 through a coating process, which can further enhance the overall sealing and protective effect of the plastic packaging bag and provide a protection against quality degradation of packaged items due to oxidation, moisture and other factors.

[0031] The polyvinylidene chloride layer 4 is transparent (according to the above, it can be suitable for transparent packaging display).

[0032] Embodiment 3:

[0033] like Figure 3 As shown, the difference from Example 2 is that: it also includes a silicone anti-fog agent layer 5 bonded to the outside of the polyvinylidene chloride layer 4, which can reduce the adhesion of water vapor and the generation of water mist to maintain the effect of transparent packaging.

[0034] The silicone anti-fogging agent layer 5 is transparent (according to the above, it can be suitable for transparent packaging display).

[0035] Embodiment 4:

[0036] like Figures 1 to 3 As shown, the difference between it and Example 2 or 3 is that: the ethylene-vinyl alcohol copolymer layer 2 is replaced by an aluminum foil layer. When transparent packaging is not required, the use of the aluminum foil layer has the following advantages:

[0037] Enhanced barrier properties: Aluminum foil has extremely high gas, water vapor and light barrier properties. Compared with EVOH, aluminum foil has lower permeability to gases such as oxygen, nitrogen, carbon dioxide and water, and can more effectively prevent the packaging contents from penetrating and exchanging with the external environment. It has a significant protective effect on products that need to maintain freshness for a long time and prevent oxidation or dehydration (such as food, medicine, chemical products, etc.);

[0038] Improve UV resistance: Aluminum foil can effectively block UV rays. For products that are sensitive to light and easily deteriorate or deteriorate due to light, the replaced composite material can provide better protection.

[0039] Enhance structural stability: Aluminum foil has good mechanical strength and tear resistance, which can increase the overall rigidity and toughness of the packaging, improve the ability to resist external impact during transportation and storage, and reduce the risk of damage;

[0040] Extend shelf life: Due to the excellent barrier properties of aluminum foil, a nearly completely closed environment is formed inside the package, which helps to slow down the oxidation, corruption, and deterioration of the contents, thereby significantly extending the shelf life of the product; and other effects.

[0041] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0042] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A high-toughness waterproof plastic packaging bag, comprising a bag layer (A) constituting a bag body with a closed inner cavity, wherein the bag layer (A) is composed of a polyethylene layer (1), an ethylene-vinyl alcohol copolymer layer (2) and a polypropylene layer (3) laminated in sequence, characterized in that: The polyethylene layer (1) contacts the inner cavity, and the polyethylene layer (1), the ethylene-vinyl alcohol copolymer layer (2) and the polypropylene layer (3) are all transparent.

2. A high-toughness waterproof plastic packaging bag according to claim 1, characterized in that: A polyvinylidene chloride layer (4) is laminated and fixed to the outside of the polypropylene layer (3).

3. A high-toughness waterproof plastic packaging bag according to claim 2, characterized in that: The polyvinylidene chloride layer (4) is transparent.

4. A high-toughness waterproof plastic packaging bag according to claim 3, characterized in that: A silicone antifogging agent layer (5) is laminated and fixed to the outside of the polyvinylidene chloride layer (4).

5. A high-toughness waterproof plastic packaging bag according to claim 4, characterized in that: The silicone antifogging agent layer (5) is transparent.

6. A high-toughness waterproof plastic packaging bag according to any one of claims 2 to 5, characterized in that: The ethylene-vinyl alcohol copolymer layer (2) was replaced with an aluminum foil layer.

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