PE (polyethylene) plastic bag with high tensile strength
By using a multi-layer composite structure and a three-dimensional reinforcing layer design, the tensile strength and label durability of PE bags are improved, solving the problems of easy tearing and label damage in traditional PE bags, and achieving a more durable and long-lasting clear label effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DONGGUAN ZHENZHI METAL & PLASTIC PROD CO LTD
- Filing Date
- 2025-07-29
- Publication Date
- 2026-05-19
AI Technical Summary
Traditional PE bags have insufficient tensile strength, making the labels easily damaged, which affects their performance and brand image.
The PE bag adopts a multi-layer composite structure, including an outer PE film, a middle reinforcing layer and an inner PE film. The outer layer has a three-dimensional reinforcing layer with a cross-shaped convex structure, and the outer layer is covered with a transparent protective film, forming a double protection of the printed layer.
It improves the tensile strength of the plastic bag, prevents tearing and wear of the label, and ensures that the label is clear and does not fade easily over a long period of time.
Smart Images
Figure CN224257312U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of plastic products technology, specifically to a PE plastic bag with high tensile strength. Background Technology
[0002] In the modern plastics industry, PE (polyethylene) bags are widely used in daily life, retail, and industrial transportation due to their low cost, good processability, and high flexibility. From supermarket shopping bags to industrial product packaging bags, PE bags play a vital role in loading, transporting, and storing goods. However, with the increasing demand for packaging, traditional PE bags have revealed two major problems in practical use:
[0003] Firstly, the tensile strength is insufficient. Ordinary PE bags are usually made of single-layer or simply composite PE film. When loaded with heavy items or subjected to external pulling force, the bag is prone to tearing or breaking, causing items to scatter or leak.
[0004] Secondly, the markings are easily damaged. To meet the needs of brand promotion and product information labeling, PE bags are usually printed with patterns and text. However, in actual use, the markings are easily faded or blurred due to friction, scratches, or chemical corrosion, affecting information delivery and brand image.
[0005] Therefore, it is necessary to propose a new technical solution to address the above problems. Utility Model Content
[0006] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.
[0007] A PE plastic bag with high tensile strength includes a bag body, the bag body being composed of at least one layer of PE film, the bag body having a holding space for holding items, and the bag body having an opening communicating with the holding space, and the bag body having a sealing structure at the opening for closing the opening.
[0008] The outer side of the plastic bag body is provided with a marking area and a three-dimensional reinforcing layer covering the marking area, wherein the three-dimensional reinforcing layer is composed of crisscrossing PE embossed patterns.
[0009] As a further embodiment of this utility model: a printing layer is provided in the marking area, the three-dimensional reinforcing layer completely covers the printing layer, and a transparent protective film is provided between the three-dimensional reinforcing layer and the printing layer.
[0010] As a further embodiment of this utility model: the bag body is a multi-layer composite structure, which includes an outer PE film, a middle reinforcing layer and an inner PE film from the outside to the inside, and the three-dimensional reinforcing layer is connected to the side of the outer PE film away from the middle reinforcing layer.
[0011] As a further embodiment of this utility model: the intermediate reinforcing layer is a nylon film, or a non-woven fabric layer, or a middle PE film.
[0012] As a further embodiment of this utility model: the sealing structure is a self-adhesive strip, which is disposed on one side of the opening of the plastic bag body, and the self-adhesive strip is covered with release paper.
[0013] As a further embodiment of this utility model: the interlaced PE embossed texture of the three-dimensional reinforcing layer forms a grid-like protective structure in the marking area.
[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0015] The plastic bag adopts a multi-layer composite structure. The middle reinforcing layer is combined with the convex and transverse embossed grid of the three-dimensional reinforcing layer, which can disperse external forces and effectively resist pulling and tearing, making it more durable than ordinary plastic bags. The printed layer is covered with a transparent protective film and a three-dimensional reinforcing layer. The transparent protective film isolates moisture and chemical corrosion, while the convex structure of the three-dimensional reinforcing layer prevents scratches. The double protection ensures that the pattern and text on the plastic bag are clear for a long time and are not easy to wear and fade.
[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 This is a schematic diagram of the structure of the plastic bag body in this utility model;
[0019] Figure 2 This is a schematic diagram of the structure of this utility model with an added three-dimensional reinforcing layer;
[0020] Figure 3 This is a schematic diagram of the structure with added sealing structure in this utility model;
[0021] Figure 4 This is a schematic diagram of the hierarchical distribution structure of this utility model.
[0022] The reference numerals and names in the figure are as follows:
[0023] 1. Bag body; 2. Storage space; 3. Opening; 4. Sealing structure; 5. Three-dimensional reinforcing layer; 6. PE embossed layer; 7. Printed layer; 8. Transparent protective film; 9. Outer PE film; 10. Middle reinforcing layer; 11. Inner PE film. Detailed Implementation
[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0025] Please see Figure 1-4 In this embodiment of the invention, a PE plastic bag with high tensile strength includes a bag body 1. The bag body 1 has a receiving space 2 for containing items and an opening 3 communicating with the space. A sealing structure 4 is provided at the opening 3. The bag body 1 is composed of at least one layer of PE film, and a multi-layer composite structure can also be used to further improve the strength.
[0026] When the bag body 1 adopts a multi-layer composite structure, from the outside to the inside, it consists of an outer PE film 9, a middle reinforcing layer 10, and an inner PE film 11. In one embodiment, the outer PE film 9 can be made by adding antioxidants and wear-resistant fillers. The antioxidant can be a hindered phenolic antioxidant, which can effectively delay the aging of PE materials under light and oxygen. The wear-resistant filler, such as calcium carbonate powder, is uniformly dispersed in the PE resin, which can enhance the surface hardness of the film and reduce friction loss. In one embodiment, the middle reinforcing layer 10 can be selected from nylon film, non-woven fabric layer, or middle PE film. Taking nylon film as an example, its tensile strength is high. It is combined with the outer PE film 9 and the inner PE film 11 through a thermal bonding process to form a stable interlayer structure, which greatly improves the overall tensile strength of the bag. If a non-woven fabric layer is used, its interwoven fiber mesh structure can disperse stress and avoid excessive local stress leading to damage. In one embodiment, the inner PE film 11 is selected according to the usage scenario. For example, when used for food packaging, a PE film that meets the safety standards for food contact materials is used to ensure safety in use.
[0027] A marking area is set on the outer side of the plastic bag body 1. A printed layer 7 is formed by printing prepared ink onto the surface of the bag using gravure or flexographic printing processes. During the printing process, the drying speed and printing pressure of the ink are precisely controlled to ensure that the brand image, product information, and other content are clearly presented. After printing, a transparent protective film 8 is bonded to the surface of the printed layer 7 using a hot melt adhesive coating process. The transparent protective film 8 is made of PET or OPP material. When applying the hot melt adhesive, the temperature and amount of adhesive are carefully controlled to ensure a tight bond between the transparent protective film 8 and the printed layer 7, forming an isolation layer.
[0028] A single-layer three-dimensional reinforcing layer 5 made of independent PE material is covered on the outside of the transparent protective film 8. In specific manufacturing, the blown film mold embossing method can be used. During the blowing and cooling stage of the PE film, the cooling roller with the raised pattern is brought into contact with the film and a certain pressure is applied to form the raised pattern on the film surface; or the calendering method can be used, in which the raised pattern engraved on the surface of the calendering roller is used to directly imprint the raised pattern when the PE raw material passes through the roller.
[0029] The formed 3D reinforcing layer 5 completely covers the printed layer 7 and the transparent protective film 8, and its surface texture forms a grid structure in the marking area. This structure reduces the direct stress on the printed layer 7 through physical support, and can disperse pressure when the bag is subjected to external pulling or squeezing. The transparent protective film 8 and the 3D reinforcing layer 5 form a double-layer protective system. The transparent protective film 8 focuses on isolating minor corrosion and process damage, while the 3D reinforcing layer 5 focuses on resisting larger external impacts and dispersing stress. The two work together to prevent the printed layer 7 from being damaged by friction, chemical corrosion, and other factors, ensuring that the marking is clear and intact for a long time.
[0030] The three-dimensional reinforcing layer 5, after molding, is formed on the outside of the transparent protective film 8 through hot melt adhesive bonding or hot pressing, forming a three-layer protective structure of printed layer 7, transparent protective film 8, and three-dimensional reinforcing layer 5. At this time, the raised texture of the three-dimensional reinforcing layer 5 disperses external forces through physical support, while the transparent protective film 8, as the intermediate layer, not only avoids direct friction between the three-dimensional reinforcing layer 5 and the printed layer 7, but also continuously isolates external erosion. The three layers work together to improve the damage resistance of the marking area and the overall tensile strength of the bag.
[0031] The sealing structure 4 of this invention is a self-adhesive strip. The self-adhesive strip is made of acrylic pressure-sensitive adhesive, coated onto a PE film substrate to form an adhesive layer. The self-adhesive strip is positioned on one side of the opening 3 of the bag body 1, and its surface is covered with release paper. The release paper is made of silicone-coated PET or glassine paper, whose surface tension is lower than that of the pressure-sensitive adhesive, preventing the strip from sticking together when not in use. In use, the release paper is removed, and the strip is pressed onto the other side of the opening 3, using the adhesive properties of the pressure-sensitive adhesive to seal the opening 3. Alternatively, depending on actual needs, the sealing structure 4 can be replaced with a zipper seal. The zipper teeth are fixed to the edges of the opening 3 using an injection molding process, and opening and closing are achieved by pulling the zipper head, suitable for applications requiring frequent opening and closing.
[0032] In summary:
[0033] The plastic bag adopts a multi-layer composite structure. The middle reinforcing layer 10 is combined with the vertical and horizontal convex grid of the three-dimensional reinforcing layer 5, which can disperse external forces and effectively resist pulling and tearing, making it more durable than ordinary plastic bags. The printed layer 7 is covered with a transparent protective film 8 and the three-dimensional reinforcing layer 5. The transparent protective film 8 isolates moisture and chemical corrosion, and the convex structure of the three-dimensional reinforcing layer 5 prevents scratches. The double protection ensures that the pattern and text on the plastic bag are clear for a long time and are not easy to wear and fade.
[0034] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.
Claims
1. A PE bag with high tensile strength, characterized by, The bag includes a plastic bag body, which is made of at least one layer of PE film. The plastic bag body has a holding space for holding items, and the plastic bag body has an opening communicating with the holding space. The plastic bag body is provided with a sealing structure at the opening for closing the opening. The outer side of the plastic bag body is provided with a marking area and a three-dimensional reinforcing layer covering the marking area, wherein the three-dimensional reinforcing layer is composed of crisscrossing PE embossed patterns.
2. The PE bag with high tensile strength according to claim 1, characterized in that, A printed layer is provided within the marked area, the three-dimensional reinforcing layer completely covers the printed layer, and a transparent protective film is provided between the three-dimensional reinforcing layer and the printed layer.
3. The PE bag with high tensile strength according to claim 1, characterized in that, The bag body has a multi-layer composite structure, which includes an outer PE film, a middle reinforcing layer and an inner PE film from the outside to the inside. The three-dimensional reinforcing layer is connected to the side of the outer PE film away from the middle reinforcing layer.
4. The PE bag with high tensile strength according to claim 3, characterized in that, The intermediate reinforcing layer is a nylon film, a non-woven fabric layer, or a middle PE film.
5. The PE bag with high tensile strength according to claim 1, characterized in that, The sealing structure is a self-adhesive strip, which is placed on one side of the opening of the bag body and covered with release paper.
6. The PE bag with high tensile strength according to claim 1, characterized in that, The interlaced PE embossed texture of the three-dimensional reinforcing layer forms a grid-like protective structure in the marking area.