Stretch-resistant packaging film and bag thereof

Abstract

The utility model provides a kind of high-strength tensile packaging film and packaging bag, including the outermost protective layer, the innermost sealing layer and the tensile resistance composite intermediate layer between the two, the composite intermediate layer is made of first nylon reinforcing layer, glass fiber cloth reinforcing layer and second nylon reinforcing layer, wherein glass fiber cloth reinforcing layer is polyurethane resin coating covered fiberglass cloth, first and second nylon reinforcing layer are fixed on the upper and lower surfaces of glass fiber cloth reinforcing layer by hot melt adhesive layer.The utility model enhances the breaking strength and tear resistance of packaging film through composite layered structure, solves the problem that existing industrial packaging bag is easy to break due to insufficient tensile resistance. At the same time, the packaging bag made of packaging film is provided with a reinforced edge part with a polyester fiber reinforcing layer and a handle fixed by a seam at the opening, further enhancing the load-bearing capacity and use reliability.

Description

Technical Field

[0001] This utility model relates to the field of packaging materials technology, specifically to a tensile-resistant packaging film and its packaging bag. Background Technology

[0002] Industrial packaging bags are widely used for packaging bulk materials in industries such as chemicals, building materials, and food. Their tensile strength directly affects the safety and service life of the packaging. Currently, most industrial packaging bags are made of single polyethylene or polypropylene materials, which have insufficient tensile strength and poor tear resistance. When loading heavy materials (such as cement and ore) or during long-distance transportation, the bags are prone to rupture and material leakage, causing not only economic losses but also potential safety hazards.

[0003] Existing improvement solutions typically involve increasing the bag's thickness to enhance its strength. However, simply increasing the thickness leads to increased material costs, reduced bag flexibility, and still fails to fundamentally address the bag's insufficient tensile strength.

[0004] Therefore, there is an urgent need to design an industrial packaging bag with a reasonable structure, high tensile strength, and controllable cost to meet the stringent requirements of industrial production. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model provides a tensile-resistant packaging film and its packaging bag. By employing a composite reinforcing layer, the tensile properties of the film itself are significantly improved, thereby increasing the tensile strength and tear resistance of the packaging bag made from it.

[0006] This utility model provides a tensile-resistant packaging film, including an outermost protective layer and an innermost sealing layer. The tensile-resistant packaging film also includes a tensile-resistant composite intermediate layer located between the protective layer and the sealing layer. The tensile-resistant composite intermediate layer comprises a first nylon reinforcing layer, a glass fiber cloth reinforcing layer, and a second nylon reinforcing layer. The first nylon reinforcing layer and the second nylon reinforcing layer are respectively fixed to two opposing surfaces of the glass fiber cloth by hot melt adhesive layers. The glass fiber cloth reinforcing layer is composed of glass fiber cloth coated with polyurethane resin, and the thickness of the first nylon reinforcing layer and the second nylon reinforcing layer is 0.015 mm.

[0007] As an optional technical solution, the thickness of the polyurethane resin coating is 0.05~0.1mm.

[0008] As an optional technical solution, the protective layer is a high-density polyethylene (HDPE) protective layer.

[0009] As an optional technical solution, the thickness of the protective layer is 0.15~0.25mm.

[0010] As an optional technical solution, the sealing layer is a low-density polyethylene (LDPE) sealing layer.

[0011] As an optional technical solution, the thickness of the sealing layer is 0.1~0.15mm.

[0012] This utility model also provides a packaging bag, including a bag body with an opening, characterized in that the bag body is made of a tensile-resistant packaging film as described above.

[0013] As an optional technical solution, the opening of the bag body is provided with a reinforced edge, and the reinforced edge is provided with a polyester fiber reinforcing layer.

[0014] As an optional technical solution, a handle is also included, which is disposed on the reinforcing edge.

[0015] As an optional technical solution, the handle and the reinforcing edge are fixed by stitching.

[0016] Compared with existing technologies, the tensile packaging film and bag of this invention, by placing a composite reinforcing layer between the outer abrasion-resistant layer and the inner sealing layer, forms a multi-layer tensile packaging film. This synergistically improves the tensile strength of the bag made from the aforementioned tensile packaging film, achieving a breaking strength ≥50MPa and tear resistance ≥80N / mm, effectively preventing the packaging bag from breaking under heavy loads. The intermediate reinforcing layer uses a woven fabric impregnated with polyurethane resin, ensuring structural stability and improving interlayer bonding to prevent delamination. Simultaneously, the polyurethane coating enhances the abrasion resistance of the tensile packaging film.

[0017] In addition, the reinforced edges at the opening of the packaging bag and the handles are reinforced with stitching, further enhancing the load-bearing capacity of the packaging bag (rated load ≥ 50kg), making it suitable for the handling and transportation needs of industrial materials and having broad application prospects. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a cross-sectional schematic diagram of a tensile packaging film according to an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of a packaging bag according to an embodiment of the present invention. Detailed Implementation

[0021] To provide a better understanding of the purpose, structure, features, and functions of this utility model, detailed descriptions are provided below with reference to specific embodiments.

[0022] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] like Figure 1 As shown, this utility model provides a tensile packaging film, including an outermost protective layer 10 and an innermost sealing layer 20. The tensile packaging film also includes a tensile composite intermediate layer 30, which is located between the protective layer 10 and the sealing layer 20. The tensile composite intermediate layer 30 includes a first nylon reinforcing layer 31, a glass fiber cloth reinforcing layer 32, and a second nylon reinforcing layer 33. The first nylon reinforcing layer 31 and the second nylon reinforcing layer 32 are respectively fixed to two opposing surfaces of the glass fiber cloth reinforcing layer 32 by hot melt adhesive layers. The glass fiber cloth reinforcing layer 32 is composed of glass fiber cloth coated with polyurethane resin, and the thickness of the first nylon reinforcing layer 31 and the second nylon reinforcing layer 32 is 0.015 mm.

[0024] In one embodiment, the thickness of the polyurethane resin coating is 0.05~0.1mm. This is achieved by immersing the fiberglass cloth in a polyurethane resin reaction system, followed by curing, resulting in a polyurethane resin coating covering the surface of the fiberglass cloth. It is understood that the polyurethane resin coating significantly increases the bonding strength between the fiberglass cloth and the upper and lower nylon reinforcing layers 31 and 33 during the bonding process via hot melt adhesive to the first nylon reinforcing layer 31 and the second nylon reinforcing layer 33, effectively preventing delamination of the tensile composite interlayer 30. Simultaneously, the presence of the polyurethane resin coating also helps improve the overall abrasion resistance and chemical corrosion resistance of the tensile packaging film. In one embodiment, the thickness of the polyurethane resin coating is 0.05-0.1mm, and the thicknesses of the first nylon reinforcing layer 31 and the second nylon reinforcing layer 33 are both 0.015mm. Increasing the thickness of the first nylon reinforcing layer 31 and the second nylon reinforcing layer 33 to 0.015mm effectively improves the puncture resistance and overall dimensional stability of the tensile composite interlayer 30.

[0025] The protective layer 10 is a high-density polyethylene (HDPE) protective layer with a thickness of 0.15~0.25mm. Preferably, the outer surface of the protective layer 10 (the surface away from the tensile composite intermediate layer 30) is provided with an anti-slip pattern, which can be formed by an embossing process. The anti-slip pattern can increase the roughness and improve the grip stability and wear resistance during handling.

[0026] The sealing layer 20 is a low-density polyethylene (LDPE) sealing layer with a thickness of 0.1~0.15mm. It has good heat-sealing performance, ensuring the sealing and corrosion resistance of the packaging film.

[0027] Reference Figure 2 This utility model also provides a packaging bag 100, which is made of Figure 1 It is made from tensile-resistant packaging film.

[0028] The packaging bag 100 is formed by a tensile-resistant packaging film, creating a packaging bag structure with an opening 110 and an internal storage cavity. The opening 110 has a reinforcing edge 111, where a polyester fiber bundle reinforcement layer is embedded via thermal bonding. This polyester fiber reinforcement layer significantly improves the tear resistance of the opening when subjected to the pulling force of the handle.

[0029] In this embodiment, the reinforcing edge 111 is continuously arranged around the opening 110. In other embodiments of this application, the reinforcing edge may also be arranged discontinuously at the opening, and the arrangement position and length of the reinforcing edge at the opening can be adjusted according to actual needs.

[0030] Furthermore, the packaging bag 100 also includes a handle 120, which is drawn as a rectangle, but is not limited thereto. The handle 120 is disposed on the reinforcing edge 111, and is a load-bearing handle that extends outward from the opening 110 for easy access by the user. In this embodiment, the handle 120 is at least partially fixedly connected to the reinforcing edge 111.

[0031] In one embodiment, the handle 120 is a woven strap or a polymer composite material strap.

[0032] In one embodiment, the handle 120 is sewn and fixed to the reinforcing cover 111 by stitch 130. In other embodiments of this invention, the handle can also be pre-fixed to the reinforcing edge by heat fusion or riveting, and then sewn by double rows of stitches to ensure multiple fixation strengths and distribute load-bearing stress.

[0033] In summary, the tensile packaging film and bag provided by this utility model, by placing a composite reinforcing layer between the outer abrasion-resistant layer and the inner sealing layer, constitute a multi-layer tensile packaging film, synergistically improving the tensile strength of the bag made from the aforementioned tensile packaging film, with a breaking strength ≥50MPa and tear resistance, with a tear strength ≥80N / mm, effectively avoiding the problem of packaging bags breaking under heavy loads. The intermediate reinforcing layer uses woven fabric impregnated with polyurethane resin, which ensures structural stability, improves interlayer bonding, and prevents delamination. Simultaneously, the polyurethane coating enhances the abrasion resistance of the tensile packaging film.

[0034] In addition, the reinforced edges at the opening of the packaging bag and the handles are reinforced with stitching, further enhancing the load-bearing capacity of the packaging bag (rated load ≥ 50kg), making it suitable for the handling and transportation needs of industrial materials and having broad application prospects.

[0035] This utility model has been described by the above-described embodiments; however, these embodiments are merely examples for implementing this utility model. Furthermore, the technical features involved in the different embodiments of this utility model described above can be combined with each other as long as they do not conflict with each other. It must be pointed out that the disclosed embodiments do not limit the scope of this utility model. On the contrary, any modifications and refinements made without departing from the spirit and scope of this utility model are within the patent protection scope of this utility model.

Claims

1. A tensile-resistant packaging film, comprising an outermost protective layer and an innermost sealing layer, characterized in that, The tensile packaging film further includes a tensile composite intermediate layer, which is located between the protective layer and the sealing layer; wherein, the tensile composite intermediate layer comprises: A first nylon reinforcing layer, a glass fiber cloth reinforcing layer, and a second nylon reinforcing layer are provided, wherein the first nylon reinforcing layer and the second nylon reinforcing layer are respectively fixed to two opposing surfaces of the glass fiber cloth reinforcing layer by hot melt adhesive layers; The glass fiber cloth reinforcement layer is composed of glass fiber cloth coated with polyurethane resin, and the thickness of the first nylon reinforcement layer and the second nylon reinforcement layer is 0.015 mm.

2. The tensile-resistant packaging film as described in claim 1, characterized in that, The thickness of the polyurethane resin coating is 0.05~0.1mm.

3. The tensile-resistant packaging film as described in claim 1, characterized in that, The protective layer is a high-density polyethylene (HDPE) protective layer.

4. The tensile-resistant packaging film as described in claim 1, characterized in that, The thickness of the protective layer is 0.15~0.25mm.

5. The tensile-resistant packaging film as described in claim 1, characterized in that, The sealing layer is a low-density polyethylene (LDPE) sealing layer.

6. The tensile-resistant packaging film as described in claim 1, characterized in that, The thickness of the sealing layer is 0.1~0.15mm.

7. A packaging bag, comprising a bag body with an opening, characterized in that, The bag body comprises a tensile packaging film as described in any one of claims 1-6.

8. The packaging bag as described in claim 7, characterized in that, The bag body has a reinforced edge at the opening, and the reinforced edge has a polyester fiber reinforcing layer.

9. The packaging bag as described in claim 8, characterized in that, It also includes a handle, which is disposed on the reinforced edge.

10. The packaging bag as described in claim 9, characterized in that, The handle and the reinforced edge are fixed by stitching.

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