Anti-tensile packaging bag with composite structure

Abstract

The utility model discloses a tensile composite structure packaging bag which is characterized by comprising a bag body, the bag body comprises an inner functional layer, a tensile reinforcing layer, an outer protective layer and a surface reinforcing structure from inside to outside in sequence, the tensile reinforcing layer is compounded with the inner functional layer through hot melt adhesive, and the outer protective layer is compounded with the surface reinforcing structure through hot melt adhesive. The outer protective layer is compounded with the tensile reinforcing layer through a polyurethane adhesive, the surface reinforcing structure is compounded on the outer surface of the outer protective layer through hot pressing, the bag body comprises a top surface, a bottom surface and four side surfaces, the top surface is provided with a feed port, and the bottom surface is provided with a discharge port. According to the utility model, a four-layer composite structure is adopted, and the tensile resistance, the puncture resistance and the interface bonding strength are remarkably improved through a layered composite process of the hot melt adhesive and the polyurethane adhesive, so that the problems of interlayer stripping, stress concentration and the like of the traditional packaging bag are solved, and the collaborative breakthrough of the structural strength, the functionality and the process feasibility is realized.

Description

A tensile-resistant composite structure packaging bag Technical Field

[0001] This utility model relates to the field of composite packaging bag technology, and in particular to a tensile-resistant composite structure packaging bag. Background Technology

[0002] With the continuous upgrading of modern logistics and industrial packaging demands, higher requirements are being placed on the mechanical properties and functional characteristics of packaging materials. Traditional packaging bags mostly use single-layer polyethylene or simple laminated structures, which generally suffer from insufficient tensile strength and poor puncture resistance when dealing with heavy loading, frequent handling, and complex transportation environments. Especially when loading powdery or granular materials, the bag is prone to rupture due to localized stress concentration, leading to leakage of contents. Although existing technologies use composite structures with polyamide or polyester film as reinforcing layers, improper bonding processes often lead to interface delamination between layers, and delamination is prone to occur during repeated stress, severely limiting the service life of the packaging bags. Currently, some composite packaging bags on the market attempt to improve strength by covering with woven fabric, but the combination of conventional polypropylene woven layers and functional films often uses solvent-based adhesives, which have defects such as poor environmental performance and rapid decay of adhesive strength. At the same time, the inlet and outlet designs of existing packaging bags mostly use simple flanged structures, lacking effective sealing and flow optimization, which easily leads to material spillage or seal failure during rapid loading and unloading. In addition, the bag structure design is not adaptable to mechanical loads and lacks an effective stress dispersion mechanism. It is prone to local deformation during stacking and transportation, especially the sides of the bag are prone to wrinkles or even tears when under pressure.

[0003] In response to the aforementioned technical bottlenecks, the industry has begun to explore new composite structures and functional designs in recent years. Existing technologies have not yet effectively solved the problems of synergistic optimization of interfacial strength, overall tensile performance under dynamic loads, and functional opening design in multi-layer composite structures. In particular, there are still technological gaps in the composite process of high-density polyethylene monofilament braided layer and polyester protective layer, innovation of flow guide section structure, and integrated molding of reinforcing ribs. Summary of the Invention

[0004] The purpose of this invention is to provide a tensile-resistant composite structure packaging bag.

[0005] The innovation of this utility model lies in the use of a four-layer composite structure consisting of linear low-density polyethylene film, biaxially oriented polyamide film, polyester film, and high-density polyethylene monofilament woven mesh. Through a layered composite process of hot melt adhesive and polyurethane adhesive, the tensile strength, puncture resistance, and interfacial bonding strength are significantly improved. This solves the problems of interlayer peeling and stress concentration in traditional packaging bags, achieving a synergistic breakthrough in structural strength, functionality, and process feasibility.

[0006] To achieve the above-mentioned utility model objectives, the technical solution of this utility model is: a tensile-resistant composite structure packaging bag, characterized in that it includes a bag body, the bag body structure consisting of an inner functional layer, a tensile-strength reinforcing layer, an outer protective layer, and a surface reinforcement structure from the inside out; the inner functional layer is a linear low-density polyethylene film; the tensile-strength reinforcing layer is a biaxially oriented polyamide film; the outer protective layer is a polyester film; the surface reinforcement structure is a mesh layer formed by interlacing high-density polyethylene monofilaments; the tensile-strength reinforcing layer is composited with the inner functional layer by hot melt adhesive; the outer protective layer is composited with the tensile-strength reinforcing layer by polyurethane adhesive; and the surface reinforcement structure is hot-pressed onto the outer surface of the outer protective layer; the bag body includes a top surface, a bottom surface, and four sides; the top surface has a feed inlet; and the bottom surface has a discharge outlet.

[0007] Furthermore, a detachable zipper is provided at the junction of the feed inlet and the top surface, and a detachable zipper is provided at the junction of the discharge outlet and the bottom surface. The zipper teeth are coated with a silicone rubber sealing layer.

[0008] Furthermore, one end of the feed inlet extends out of the bag body to form an extension section, and the other end extends into the bag body to form a guide section. The end of the guide section is provided with a trumpet-shaped feed inlet, and the opening diameter of the feed inlet is 1.5-2 times the diameter of the feed inlet.

[0009] Furthermore, each side of the bag body is provided with a reinforcing rib structure, the reinforcing rib structure is cross-shaped, and the reinforcing rib structure is formed by co-extrusion of high-density polyethylene material.

[0010] Furthermore, the bag body has support openings at both ends of its top surface for lifting the bag body.

[0011] Furthermore, the mesh layer nodes of the surface reinforcement structure are provided with hot-melt reinforcement points, the diameter of which is 2-3 mm.

[0012] The beneficial effects of this utility model are:

[0013] 1. In this utility model, four layers of materials work synergistically to enhance performance. The linear low-density polyethylene film provides flexibility and sealing, the biaxially oriented polyamide film imparts high tensile strength, the polyester film improves abrasion resistance, and the surface high-density polyethylene monofilament woven mesh layer enhances tear resistance, forming a gradient performance protection system. The layered composite process is optimized. Hot melt adhesive is used to bond the inner and middle layers to avoid solvent residue. Polyurethane adhesive is used to bond the middle and outer layers to ensure fatigue resistance. The hot pressing process fixes the surface mesh layer, thereby improving the interlayer bonding strength and effectively suppressing the risk of delamination under dynamic loads.

[0014] 2. This utility model utilizes silicone rubber-coated chain teeth to enhance the zipper's abrasion resistance and airtightness, while supporting multiple opening and closing, making it suitable for industrial scenarios requiring frequent loading and unloading; the flared feed inlet expands the flow channel cross-sectional area, reducing the local accumulation pressure of powder or granular materials and increasing loading and unloading speed; combined with the structural design of the guide section extending deep into the bag body, it reduces residue; the co-extruded cross-shaped high-density polyethylene reinforcing ribs are integrally molded with the bag body, improving lateral compressive strength, suppressing sidewall wrinkles, and extending the bag's lifespan by 2-3 times. Attached Figure Description

[0015] Figure 1 is a perspective view of the overall structure of this utility model.

[0016] Figure 2 is a schematic diagram of the overall structure of the packaging bag of this utility model.

[0017] In the picture:

[0018] 1. Inner functional layer; 2. Tensile reinforcement layer; 3. Outer protective layer; 4. Surface reinforcement structure; 5. Top surface; 6. Bottom surface; 7. Side surface; 8. Inlet; 9. Outlet; 10. Zipper; 11. Feed port; 12. Reinforcing rib structure; 13. Support port. Detailed Implementation

[0019] The technical solutions in the embodiments of this utility model will now be clearly and completely described with reference to the accompanying drawings.

[0020] Example 1: As shown in Figures 1 and 2, a tensile-resistant composite structure packaging bag includes a bag body. The bag body structure, from the inside out, consists of an inner functional layer 1, a tensile-strength reinforcing layer 2, an outer protective layer 3, and a surface-reinforcing structure 4. The inner functional layer 1 is a linear low-density polyethylene film, the tensile-strength reinforcing layer 2 is a biaxially oriented polyamide film, the outer protective layer 3 is a polyester film, and the surface-reinforcing structure 4 is a mesh layer formed by interlacing high-density polyethylene monofilaments. The tensile-strength reinforcing layer 2 is bonded to the inner functional layer 1 with hot melt adhesive, the outer protective layer 3 is bonded to the tensile-strength reinforcing layer 2 with polyurethane adhesive, and the surface-reinforcing structure 4 is hot-pressed onto the surface of the outer protective layer 3. The bag body includes a top surface 5, a bottom surface 6, and four side surfaces 7. The top surface 5 has a feed inlet 8, and the bottom surface 6 has a discharge outlet 9. A detachable zipper 10 is provided at the junction of the feed inlet 8 and the top surface 5, and a detachable zipper 10 is provided at the junction of the discharge outlet 9 and the bottom surface 6. The zipper teeth of the zipper 10 are coated with a silicone rubber sealing layer. One end of the inlet 8 extends outside the bag body to form an extension section, and the other end extends into the bag body to form a guide section. A trumpet-shaped feed inlet 11 is located at the end of the guide section, with an opening diameter 1.5-2 times that of the inlet. Each side 7 of the bag body has a reinforcing rib structure 12, which is cross-shaped and formed from high-density polyethylene material through a co-extrusion process. Support openings 13 for lifting the bag body are located at both ends of the top surface 5. Hot-melt reinforcing points, 2-3 mm in diameter, are provided at the nodes of the mesh layer of the surface reinforcement structure 4.

[0021] The working principle of this utility model is as follows: Tensile strength and efficient sealing are achieved through the synergistic effect of gradient composite of multiple materials and functionalized structure. The inner functional layer 1 is a linear low-density polyethylene film providing a flexible sealing base; the tensile reinforcement layer 2 is a biaxially oriented polyamide film resisting longitudinal and transverse tensile stress; the outer protective layer 3 is a polyester film resisting external wear; the surface reinforcement structure 4 forms a tear-resistant skeleton through hot-melt reinforcement at the cross nodes of high-density polyethylene monofilaments; the zipper 10 with a silicone rubber sealing layer at the inlet 8 and outlet 9 maintains airtightness during dynamic opening and closing; the funnel-shaped feed inlet of the guide section expands the material flow channel and reduces resistance; the side cross-reinforcing rib structure 12 is integrated with the bag body through co-extrusion process to disperse stacking pressure; and the top support opening 13 optimizes the mechanical support point. Finally, through the integrated design of materials, structure, and process, the integrated functions of tensile strength, puncture resistance, deformation resistance, and efficient loading and unloading are achieved.

[0022] In summary, the described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A stretch-resistant composite-structure packaging bag, characterized by, The bag includes a bag body, the bag body structure consisting of, from the inside out, an inner functional layer, a tensile reinforcement layer, an outer protective layer, and a surface reinforcement structure. The inner functional layer is a linear low-density polyethylene film, the tensile reinforcement layer is a biaxially oriented polyamide film, the outer protective layer is a polyester film, and the surface reinforcement structure is a mesh layer formed by interlacing high-density polyethylene monofilaments. The tensile reinforcement layer is bonded to the inner functional layer with hot melt adhesive, the outer protective layer is bonded to the tensile reinforcement layer with polyurethane adhesive, and the surface reinforcement structure is bonded to the outer surface of the outer protective layer by hot pressing. The bag body includes a top surface, a bottom surface, and four sides. The top surface has a feed inlet, and the bottom surface has a discharge outlet.

2. The stretch-resistant composite-structure bag of claim 1, wherein, The feed inlet and the top surface are connected by a detachable zipper, and the discharge outlet and the bottom surface are connected by a detachable zipper. The zipper teeth are coated with a silicone rubber sealing layer.

3. The stretch-resistant composite-structure bag of claim 1, wherein, One end of the feed inlet extends out of the bag body to form an extension section, and the other end extends into the bag body to form a guide section. The end of the guide section is provided with a trumpet-shaped feed inlet, and the opening diameter of the feed inlet is 1.5-2 times the diameter of the feed inlet.

4. The tensile-resistant composite structure packaging bag according to claim 1, characterized in that, The bag body is provided with reinforcing ribs on each side. The reinforcing ribs are cross-shaped and are formed by co-extrusion of high-density polyethylene material.

5. The stretch-resistant composite-structure bag of claim 1, wherein, The bag body has support openings at both ends of its top surface for lifting the bag body.

6. The stretch-resistant composite-structure bag of claim 1, wherein, The surface-reinforced structure has hot-melt reinforcement points at the nodes of the grid layer, and the diameter of the hot-melt reinforcement points is 2-3 mm.

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