A tensile plastic bag

Abstract

The utility model discloses a tensile plastic bag, comprising a plastic bag body, the plastic bag body comprising an inner layer directly contacting an article, a reinforcing layer and an outer layer stacked in sequence on the inner layer, an adhesive layer arranged between the inner layer and the reinforcing layer, and an adhesive layer also arranged between the reinforcing layer and the outer layer. The inner layer has a density of 0.910-0.940 g / cm 3 The low-density polyethylene layer and the reinforcement layer have a density of 0.941-0.965g / cm 3 The outer layer is a polypropylene layer, and the adhesive layer is an adhesive resin layer. The adhesive resin layer can be a polyurethane or polyolefin modified resin. A barrier layer for preventing gas permeation can also be arranged between the adhesive layer and the reinforcing layer, and the barrier layer is an ethylene-vinyl alcohol copolymer. The combination of multiple layers of materials significantly improves the tensile strength and service life of the plastic bag, and is suitable for packaging applications that require high strength and durability.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic bags, in particular to a tensile-resistant plastic bag. Background Art

[0002] In the modern packaging industry, plastic bags are widely used in food, daily necessities, industrial products and other fields as a lightweight, economical and versatile packaging material. However, as the market's requirements for packaging material performance continue to increase, traditional plastic bags have gradually revealed their limitations in terms of tensile strength, durability and barrier properties. Especially when packaging heavy objects or requiring large tensile forces, ordinary plastic bags are prone to tearing or damage, which not only affects the integrity of the packaging, but may also lead to the loss of goods and safety hazards.

[0003] In view of this, the inventor specially designed a tensile plastic bag, and this case was thus generated. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] The purpose of the present application is to provide a tensile-resistant plastic bag, which at least solves the problem that conventional ordinary plastic bags are easily torn and broken.

[0006] (II) Technical solution

[0007] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0008] The present application provides a tensile plastic bag, comprising a plastic bag body, wherein the plastic bag body comprises an inner layer directly contacting an article, wherein the inner layer is sequentially stacked with a reinforcement layer and an outer layer, wherein an adhesive layer is disposed between the inner layer and the reinforcement layer, and wherein an adhesive layer is disposed between the reinforcement layer and the outer layer;

[0009] Wherein, the inner layer includes a density of 0.910-0.940g / cm 3 The reinforcing layer comprises a low-density polyethylene layer having a density of 0.941-0.965 g / cm 3 The outer layer comprises a polypropylene layer; and the adhesive layer comprises an adhesive resin layer.

[0010] In a further embodiment, the adhesive resin layer is polyurethane.

[0011] In a further embodiment, the adhesive resin layer is a polyolefin modified resin.

[0012] In a further embodiment, the low density polyethylene layer has a thickness of 10-50 microns.

[0013] In a further embodiment, the high density polyethylene layer has a thickness of 10-50 microns.

[0014] In a further embodiment, the adhesive resin layer has a thickness of 1-5 microns.

[0015] In a further embodiment, the polypropylene layer has a thickness of 10-50 microns.

[0016] In a further embodiment, a barrier layer for preventing gas penetration is also provided in the adhesive layer and the reinforcement layer.

[0017] In a further embodiment, the barrier layer is ethylene-vinyl alcohol copolymer.

[0018] (III) Beneficial effects

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] By setting a reinforcement layer between the inner layer and the outer layer, especially using high-density polyethylene as the reinforcement layer, the tensile properties of the plastic bag are significantly improved, enabling it to withstand greater tensile force, thereby protecting the packaging contents from damage during transportation and storage.

[0021] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In the attached picture:

[0023] Figure 1 This is a schematic diagram of the overall structure of the plastic bag of the utility model;

[0024] Figure 2 It is a schematic diagram of the structure of each layer of the plastic bag of the utility model.

[0025] Explanation of the numbers in the figure: 1, plastic bag body; 10, inner layer; 20, reinforcement layer; 30, outer layer; 40, adhesive layer; 50, barrier layer. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model.

[0027] Figure 1 and Figure 2As shown, the utility model provides a tensile-resistant plastic bag, including a plastic bag body 1, the plastic bag body 1 includes an inner layer 10 directly contacting an article, the inner layer 10 is stacked with a reinforcement layer 20 and an outer layer 30 in sequence, an adhesive layer 40 is arranged between the inner layer 10 and the reinforcement layer 20, and an adhesive layer 40 is arranged between the reinforcement layer 20 and the outer layer 30.

[0028] The inner layer 10 includes a density of 0.910-0.940 g / cm 3 The low-density polyethylene layer has a thickness of 10-50 microns. The low-density polyethylene layer as the inner layer 10 has the main function of providing good heat sealing performance and direct contact with the packaged items. The thickness selection within this range can ensure sufficient sealing and flexibility while avoiding excessive use of materials to reduce costs and maintain the lightness of the plastic bag.

[0029] The reinforcing layer 20 includes a density of 0.941-0.965 g / cm 3 The high-density polyethylene layer has a thickness of 10-50 microns. The high-density polyethylene is used as the reinforcement layer 20, and its main function is to provide tensile strength and structural support. This thickness range can ensure that the plastic bag has sufficient strength while maintaining the lightweight and cost-effectiveness of the material.

[0030] The outer layer 30 includes a polypropylene layer and has a thickness of 10-50 microns. The polypropylene layer as the outer layer 30 has the main function of providing heat resistance, chemical stability and protection. This thickness range can ensure that the plastic bag has sufficient durability and protection performance while maintaining lightness and economy.

[0031] The adhesive layer 40 includes an adhesive resin layer with a thickness of 1-5 microns. The adhesive resin layer is used to ensure a firm bond between the layers. This thin thickness is sufficient to achieve effective bonding while reducing the use of materials, helping to reduce costs and maintain the overall thinness of the plastic bag. In addition, the adhesive resin layer is selected from polyurethane or polyolefin modified resin.

[0032] The barrier layer 50 is an ethylene-vinyl alcohol copolymer layer, which is usually thinner because materials such as ethylene-vinyl alcohol copolymer have extremely high barrier properties. Even with a thin thickness, it can effectively prevent gas penetration and maintain the freshness and quality of the package contents.

[0033] The process flow of the utility model is as follows.

[0034] Material preparation: Prepare raw materials such as low-density polyethylene (LDPE), high-density polyethylene (HDPE), polypropylene (PP), polyurethane or polyolefin modified resin, and ethylene-vinyl alcohol copolymer (EVOH). Ensure that all materials meet the specified density and thickness requirements.

[0035] Multi-layer co-extrusion: Use a multi-layer co-extruder to feed each layer of material into different extruders. Low-density polyethylene (LDPE) is used as the inner layer 10, high-density polyethylene (HDPE) is used as the reinforcement layer 20, polypropylene (PP) is used as the outer layer 30, ethylene-vinyl alcohol copolymer (EVOH) is used as the barrier layer 50, and polyurethane or polyolefin modified resin is used as the adhesive layer 40. During the extrusion process, the uniform extrusion of each layer of material and good interlayer adhesion are ensured by precisely controlling the extrusion temperature and speed.

[0036] Lamination and cooling: The extruded multi-layer material is cooled and shaped by cooling rollers to form a continuous multi-layer plastic film. In this process, it is ensured that the thickness and structure of the film meet the design requirements.

[0037] Cutting and forming: The cooled multi-layer plastic film is cut into required sizes and sealed using heat sealing or ultrasonic sealing technology to form plastic bags.

[0038] The last step is quality inspection, packaging, storage, shipment and other follow-up links.

[0039] In summary, the tensile plastic bag described in the utility model, the plastic bag body 1 is composed of an inner layer 10, a reinforcement layer 20 and an outer layer 30, and the layers are tightly combined by an adhesive layer 40 to ensure the overall structural stability and durability. The inner layer 10 is made of low-density polyethylene to provide softness and a good object contact experience; the reinforcement layer 20 is made of high-density polyethylene to give the plastic bag the necessary tensile strength; the outer layer 30 is made of polypropylene to enhance wear resistance and weather resistance. The adhesive layer 40 can be made of polyurethane or polyolefin modified resin to ensure firm adhesion between the layers. In addition, the introduction of the barrier layer 50, especially the use of ethylene-vinyl alcohol copolymer, effectively prevents gas permeation and improves the fresh-keeping performance of the plastic bag. The tensile plastic bag of the utility model, through its innovative design and material combination, not only improves the mechanical properties and barrier properties of the plastic bag, but also takes into account cost-effectiveness and environmental protection. It is suitable for a variety of packaging needs and has broad market application prospects.

[0040] The utility model is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the utility model, or the concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A tensile plastic bag, characterized in that: The plastic bag body (1) comprises an inner layer (10) directly contacting an article, the inner layer (10) being stacked with a reinforcement layer (20) and an outer layer (30) in sequence, an adhesive layer (40) being arranged between the inner layer (10) and the reinforcement layer (20), and an adhesive layer (40) being arranged between the reinforcement layer (20) and the outer layer (30); Wherein, the inner layer (10) comprises a density of 0.910-0.940 g / cm 3 The reinforcing layer (20) comprises a low-density polyethylene layer having a density of 0.941-0.965 g / cm 3 The outer layer (30) comprises a polypropylene layer; and the adhesive layer (40) comprises an adhesive resin layer.

2. A tensile plastic bag according to claim 1, characterized in that: The adhesive resin layer is polyurethane.

3. The tensile plastic bag according to claim 1, characterized in that: The adhesive resin layer is a polyolefin modified resin.

4. The tensile plastic bag according to claim 1, characterized in that: The thickness of the low-density polyethylene layer is 10-50 microns.

5. The tensile plastic bag according to claim 1, characterized in that: The thickness of the high-density polyethylene layer is 10-50 microns.

6. The tensile plastic bag according to claim 1, characterized in that: The thickness of the adhesive resin layer is 1-5 microns.

7. The tensile plastic bag according to claim 1, characterized in that: The thickness of the polypropylene layer is 10-50 microns.

8. The tensile plastic bag according to claim 1, characterized in that: A barrier layer (50) for preventing gas penetration is also provided between the adhesive layer (40) and the reinforcement layer (20).

9. A tensile plastic bag according to claim 8, characterized in that: The barrier layer (50) is ethylene-vinyl alcohol copolymer.

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