Breathable polyethylene film structure

Abstract

The utility model provides a kind of breathable polyethylene film structure, including first polyethylene base material, still including second polyethylene base material and breathable pipe, the breathable pipe is fixed between first polyethylene base material and second polyethylene base material, first inclined hole and second inclined hole are respectively set in the two sides of the breathable pipe, the side of first polyethylene base material opposite to breathable pipe is fixedly connected with conductive layer, first through hole that is communicated with first inclined hole is set on first polyethylene base material, second through hole that is communicated with second inclined hole is set on second polyethylene base material, third through hole that is communicated with first through hole is set on conductive layer, reach the purpose of improving breathability.

Description

Technical Field

[0001] This utility model relates to polyethylene film, and more particularly to a breathable polyethylene film structure. Background Technology

[0002] Polyethylene film is widely used in the packaging industry due to its excellent chemical stability and mechanical properties. Its antistatic properties are particularly important in the packaging of electronic products, precision instruments, and dust-sensitive environments.

[0003] In current existing technologies, for example, Chinese patent CN205997472U discloses an antistatic polyethylene film. This technical solution includes, from bottom to top, a first conductive layer, a polyethylene base layer, a second conductive layer, and a wear-resistant layer. The first and second conductive layers are both polyethylene layers with attached carbon nanotubes, and the wear-resistant layer is a polyethylene layer with attached abrasion-resistant agent. This patented technology, by setting conductive layers on both sides of the substrate, can effectively eliminate the accumulation of static electricity on the surface of the polyethylene film, reducing the risk of electric shock or fire caused by electrostatic discharge, and also reducing pollution caused by static-attracted dust. Furthermore, the wear-resistant layer reduces the coefficient of friction, improving the durability of the film.

[0004] The aforementioned antistatic polyethylene film employs a multi-layered, dense composite structure. While this significantly improves antistatic and abrasion resistance, its overall structure is highly airtight, lacking necessary breathability. In real-world packaging scenarios, such as for fresh produce and electronic components requiring heat dissipation, there are specific requirements for the breathability of packaging materials. If such items are directly wrapped in the existing antistatic film, the inability to exchange gases can easily lead to internal stuffiness, moisture buildup, or pressure imbalances, thus affecting the quality or shelf life of the packaged goods. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a breathable polyethylene membrane structure to improve breathability.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is: a breathable polyethylene membrane structure, including a first polyethylene substrate, a second polyethylene substrate, and a breathable tube. The breathable tube is fixed between the first polyethylene substrate and the second polyethylene substrate. A first oblique hole and a second oblique hole are respectively opened on both sides of the breathable tube. A conductive layer is fixedly connected to the side of the first polyethylene substrate facing away from the breathable tube. A first through hole communicating with the first oblique hole is opened on the first polyethylene substrate. A second through hole communicating with the second oblique hole is opened on the second polyethylene substrate. A third through hole communicating with the first through hole is opened on the conductive layer.

[0007] To achieve the above technical solution, a stable gas exchange channel is constructed by fixing a vent pipe between the first polyethylene substrate and the second polyethylene substrate. In actual use, gas sequentially passes through the third through-hole on the conductive layer, the first through-hole on the first polyethylene substrate, enters the first oblique hole on the vent pipe, is guided internally by the vent pipe, flows out through the second oblique hole on the vent pipe, and passes through the second through-hole on the second polyethylene substrate, thus achieving air circulation on both sides of the membrane structure. This not only solves the problem of excessive airtightness after the first and second polyethylene substrates are combined, preventing internal moisture accumulation, but also utilizes the conductive layer fixed to the outside of the first polyethylene substrate to construct an electrostatic dissipation plane, effectively preventing electrostatic accumulation and achieving a synergistic coexistence of excellent air permeability and antistatic function.

[0008] As a preferred embodiment of this utility model, the first oblique hole and the second oblique hole are staggered.

[0009] To achieve the above technical solution, the first and second oblique holes on the vent pipe are staggered, causing the gas flow path within the vent pipe to be tortuous. When dust or impurities from the external environment enter the second oblique hole of the vent pipe through the second through-hole on the second polyethylene substrate, because the first and second oblique holes are not on the same straight line, the dust particles cannot be turned at a large angle with the airflow, thus impacting and being intercepted by the inner wall of the vent pipe. This effectively prevents external pollutants from penetrating the vent pipe and entering the first polyethylene substrate and conductive layer, thereby avoiding contamination of the packaged items by external dust.

[0010] As a preferred embodiment of this utility model, an anti-detachment rod is provided on the outer wall of the vent tube. One end of the anti-detachment rod is fixed to the outer wall of the vent tube, and the other end of the anti-detachment rod extends away from the vent tube. Both the first polyethylene substrate and the second polyethylene substrate are provided with anti-detachment blind holes for fixing the anti-detachment rod.

[0011] To achieve the above technical solution, when the breathable polyethylene membrane structure is subjected to external forces such as stretching or compression during packaging or transportation, the anti-detachment rods set on the outer wall of the vent tube act as rigid anchors, tightly embedded in the anti-detachment blind holes of the first polyethylene substrate and the second polyethylene substrate. This mechanical interlocking structure restricts the relative displacement between the vent tube and the first and second polyethylene substrates on both sides, preventing the vent tube from loosening or falling off due to membrane deformation, ensuring the overall stability of the multi-layer structure, and enabling the breathable polyethylene membrane structure to maintain good ventilation channels during long-term use.

[0012] In a preferred embodiment of the present invention, the conductive layer includes a first polyurethane resin layer and a conductive wire fixed on the first polyurethane resin layer, and the third through hole is formed on the first polyurethane resin layer.

[0013] To achieve the above technical solution, the conductive layer utilizes a first polyurethane resin layer as a flexible substrate, in which conductive wires are fixed. Since the conductive layer directly adheres to the packaged item, when static charges are generated on the item's surface due to friction or induction, the network of conductive wires distributed within the first polyurethane resin layer acts as a low-impedance channel, rapidly conducting and dissipating the charge, preventing charge accumulation on the item's surface. The first polyurethane resin layer provides excellent flexibility, ensuring that the conductive network does not break when the conductive layer is bent and wrapped tightly against the item's contours, thus providing continuous and stable electrostatic protection for the packaged item.

[0014] As a preferred embodiment of the present invention, a protective layer is fixedly connected to the side of the second polyethylene substrate facing away from the first polyethylene substrate, and a fourth through hole communicating with the second through hole is provided on the protective layer.

[0015] To achieve the above technical solution, a protective layer is fixedly connected to the side of the second polyethylene substrate facing away from the first polyethylene substrate, and is kept in communication with the second through-hole through a fourth through-hole on the protective layer to maintain air permeability. As the outermost barrier of this breathable polyethylene membrane structure, the protective layer directly withstands physical contact from the external environment. This design effectively isolates the second polyethylene substrate from direct scratches or punctures by sharp external objects, preventing structural failure due to damage to the outer layer, and significantly improving the durability of the breathable polyethylene membrane structure in warehousing and logistics.

[0016] As a preferred embodiment of this utility model, the protective layer includes a second polyurethane resin layer and wear-resistant particles. The fourth through hole is formed on the second polyurethane resin layer, and the wear-resistant particles are dispersed in the second polyurethane resin layer. The particle size of the wear-resistant particles is larger than the thickness of the second polyurethane resin layer.

[0017] To achieve the above technical solution, the wear-resistant particles dispersed in the second polyurethane resin layer have a particle size larger than the thickness of the second polyurethane resin layer, causing some of the wear-resistant particles to protrude from the outer surface of the protective layer. When the outer surface of this breathable polyethylene membrane structure experiences relative sliding friction with a transport vehicle or other packaging, the protruding wear-resistant particles act as the main stress points, transforming the original surface contact into point contact. The high hardness of the wear-resistant particles withstands wear, protecting the second polyurethane resin layer and the underlying second polyethylene substrate from damage.

[0018] As a preferred embodiment of this utility model, the wear-resistant particles include silicon dioxide powder.

[0019] To achieve the above technical solution, silica powder is selected as the wear-resistant particle, utilizing its extremely high physical hardness and chemical stability. Under harsh external friction environments, silica powder can effectively resist high-intensity mechanical scratches without easily breaking, while its excellent dispersion in the second polyurethane resin layer ensures the uniformity of the protective performance on the outer surface of the protective layer. This further enhances the scratch resistance of the outer surface of the breathable polyethylene membrane structure, ensuring that it maintains its appearance and functionality even in rough transportation environments.

[0020] As a preferred embodiment of this utility model, nano-titanium dioxide particles are dispersed within the second polyurethane resin layer.

[0021] To achieve the above technical solution, nano-titanium dioxide particles are dispersed within the outermost second polyurethane resin layer, endowing the protective layer with photocatalytic and UV-resistant functions. Utilizing the UV-shielding effect of nano-titanium dioxide, this structure effectively blocks ultraviolet rays from penetrating the protective layer and reaching the second polyethylene substrate and the internal contents, preventing substrate aging and cracking. Simultaneously, the photocatalytic properties of nano-titanium dioxide help degrade organic pollutants adhering to the surface of the protective layer, inhibit bacterial growth, and maintain the cleanliness of the outer surface of the breathable polyethylene film structure, thereby extending the overall service life of the packaging material. Attached Figure Description

[0022] Figure 1 This is a cross-sectional structural diagram of the present invention; Figure 2 A schematic diagram illustrating the three-dimensional structure of the vent pipe; Figure 3 A schematic diagram illustrating the three-dimensional structure of the conductive wire.

[0023] Reference numerals: 1. First polyethylene substrate; 2. Second polyethylene substrate; 3. Vent tube; 4. Anti-detachment rod; 5. Anti-detachment blind hole; 6. First oblique hole; 7. Second oblique hole; 8. Conductive layer; 9. First polyurethane resin layer; 10. Conductive wire; 11. Third through hole; 12. Protective layer; 13. Second polyurethane resin layer; 14. Wear-resistant particles; 15. Fourth through hole; 16. Nano titanium dioxide particles; 17. First through hole; 18. Second through hole. Detailed Implementation

[0024] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, so that the technical solution of this utility model can be more easily understood and mastered.

[0025] A breathable polyethylene membrane structure includes a first polyethylene substrate 1, a second polyethylene substrate 2, and a breathable tube 3. The breathable tube 3 is fixed between the first polyethylene substrate 1 and the second polyethylene substrate 2.

[0026] An anti-detachment rod 4 is integrally connected to the outer wall of the vent pipe 3. One end of the anti-detachment rod 4 is fixed to the outer wall of the vent pipe 3, and the other end of the anti-detachment rod 4 extends away from the vent pipe 3. Anti-detachment blind holes 5 for fixing the anti-detachment rod 4 are provided on both the first polyethylene substrate 1 and the second polyethylene substrate 2. Multiple anti-detachment rods 4 are arranged along the axis of the vent pipe 3.

[0027] In this embodiment, the anti-detachment blind hole 5 is formed in situ through a hot-pressing composite process. Specifically, during assembly, the first polyethylene substrate 1 and the second polyethylene substrate 2 are heated to a thermoplastic softened state, and the vent tube 3 with the anti-detachment rod 4 is sandwiched between the two substrates. Subsequently, normal pressure is applied to the first polyethylene substrate 1 and the second polyethylene substrate 2, forcing the anti-detachment rod 4 to embed into the softened substrate surface. Since the first polyethylene substrate 1 and the second polyethylene substrate 2 are in a thermoplastic state, their compressed portions undergo plastic deformation and cover the anti-detachment rod 4, thereby forming a recessed structure on the inner side of the first polyethylene substrate 1 and the second polyethylene substrate 2 that matches the shape of the anti-detachment rod 4. This recessed structure constitutes the anti-detachment blind hole 5.

[0028] The first polyethylene substrate 1 and the second polyethylene substrate 2 are made of low-density polyethylene, and the vent pipe 3 is made of modified TPE material. The melting point of the vent pipe 3 is higher than that of the first polyethylene substrate 1 and the second polyethylene substrate 2.

[0029] A first oblique hole 6 and a second oblique hole 7 are respectively provided on both sides of the vent pipe 3. The first oblique hole 6 and the second oblique hole 7 are both connected to the outer wall and the inner wall of the vent pipe 3.

[0030] A conductive layer 8 is fixedly connected to the side of the first polyethylene substrate 1 facing away from the vent pipe 3. A first through hole 17 communicating with the first oblique hole 6 is formed on the first polyethylene substrate 1, a second through hole 18 communicating with the second oblique hole 7 is formed on the second polyethylene substrate 2, and a third through hole 11 communicating with the first through hole 17 is formed on the conductive layer 8.

[0031] The conductive layer 8 includes a first polyurethane resin layer 9 and conductive wires 10 fixed to the first polyurethane resin layer 9. A third through-hole 11 is formed in the first polyurethane resin layer 9. The first polyurethane resin layer 9 is fixed to the first polyethylene substrate 1. The conductive wires 10 are stainless steel fibers in an S-shaped bend. Specifically, the stainless steel fibers can be laid on the surface of the substrate in an S-shaped trajectory first, and then the first polyurethane resin layer 9 can be covered.

[0032] Considering that the first polyethylene substrate 1 is a non-polar material with low surface energy, in order to ensure a strong bond between it and the first polyurethane resin layer 9, the bonding surface of the first polyethylene substrate 1 needs to be surface activated before coating. Corona treatment or plasma treatment is preferred to increase the dyne value of the surface of the first polyethylene substrate 1 to 38 dynes / cm or higher.

[0033] After surface activation treatment, polar functional groups are generated on the surface of the first polyethylene substrate 1, forming a micro-rough surface. Subsequently, liquid first polyurethane resin is uniformly coated on the treated surface. After heating, drying, and cross-linking curing, the first polyurethane resin layer 9 forms a stable chemical bond and physical anchoring bond with the first polyethylene substrate 1.

[0034] A protective layer 12 is fixedly connected to the side of the second polyethylene substrate 2 facing away from the first polyethylene substrate 1, and a fourth through hole 15 communicating with the second through hole 18 is provided on the protective layer 12.

[0035] The protective layer 12 includes a second polyurethane resin layer 13 and wear-resistant particles 14. The second polyurethane resin layer 13 is fixed to the second polyethylene substrate 2. A fourth through hole 15 is formed in the second polyurethane resin layer 13, and the wear-resistant particles 14 are dispersed in the second polyurethane resin layer 13. The particle size of the wear-resistant particles 14 is larger than the thickness of the second polyurethane resin layer 13.

[0036] Wear-resistant particles 14 are silicon dioxide powder.

[0037] Nano-titanium dioxide particles 16 are dispersed within the second polyurethane resin layer 13.

[0038] Of course, the above are just typical examples of this utility model. In addition, this utility model may have many other specific implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed by this utility model.

Claims

1. A breathable polyethylene membrane structure, comprising a first polyethylene substrate (1), characterized in that: It also includes a second polyethylene substrate (2) and a vent tube (3). The vent tube (3) is fixed between the first polyethylene substrate (1) and the second polyethylene substrate (2). The vent tube (3) has a first oblique hole (6) and a second oblique hole (7) on both sides. The first polyethylene substrate (1) has a conductive layer (8) fixedly connected to the side facing away from the vent tube (3). The first polyethylene substrate (1) has a first through hole (17) communicating with the first oblique hole (6). The second polyethylene substrate (2) has a second through hole (18) communicating with the second oblique hole (7). The conductive layer (8) has a third through hole (11) communicating with the first through hole (17).

2. The breathable polyethylene membrane structure according to claim 1, characterized in that: The first oblique hole (6) and the second oblique hole (7) are offset.

3. The breathable polyethylene membrane structure according to claim 1, characterized in that: An anti-detachment rod (4) is provided on the outer wall of the vent tube (3). One end of the anti-detachment rod (4) is fixed to the outer wall of the vent tube (3), and the other end of the anti-detachment rod (4) extends away from the vent tube (3). The first polyethylene substrate (1) and the second polyethylene substrate (2) are both provided with anti-detachment blind holes (5) for fixing the anti-detachment rod (4).

4. The breathable polyethylene membrane structure according to claim 1, characterized in that: The conductive layer (8) includes a first polyurethane resin layer (9) and a conductive wire (10) fixed on the first polyurethane resin layer (9), and the third through hole (11) is formed on the first polyurethane resin layer (9).

5. The breathable polyethylene membrane structure according to claim 1, characterized in that: A protective layer (12) is fixedly connected to the side of the second polyethylene substrate (2) facing away from the first polyethylene substrate (1), and a fourth through hole (15) communicating with the second through hole (18) is provided on the protective layer (12).

6. The breathable polyethylene membrane structure according to claim 5, characterized in that: The protective layer (12) includes a second polyurethane resin layer (13) and wear-resistant particles (14). The fourth through hole (15) is opened on the second polyurethane resin layer (13). The wear-resistant particles (14) are dispersed in the second polyurethane resin layer (13). The particle size of the wear-resistant particles (14) is greater than the thickness of the second polyurethane resin layer (13).

7. The breathable polyethylene membrane structure according to claim 6, characterized in that: The wear-resistant particles (14) include silica powder.

8. The breathable polyethylene membrane structure according to claim 6, characterized in that: Nano-titanium dioxide particles (16) are dispersed within the second polyurethane resin layer (13).

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