A high-strength polyethylene film structure

Abstract

The utility model provides a kind of high firmness polyethylene film structure, including flexible rib and two polyethylene base materials, the flexible rib is located between two the polyethylene base material, the flexible rib is opened with gas guide hole along the length direction of itself, first air hole that is communicated with gas guide hole is opened on the side wall of the flexible rib, second air hole that is communicated with first air hole is opened on polyethylene base material, the cross section of flexible rib whole is arranged in the shape of H, the side of polyethylene base material towards flexible rib is opened with T-shaped anti-off groove, the two sides of the flexible rib are respectively fixed in two T-shaped anti-off grooves, reach the purpose of improving structural stability.

Description

Technical Field

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

[0002] Polyethylene film is widely used in packaging, agriculture, and medical protection due to its excellent chemical stability and moisture resistance. To balance the strength and breathability of the film, existing technologies typically employ multi-layer composite structures.

[0003] Chinese Patent Publication No. CN220280799U discloses a breathable composite polyethylene film. The technical solution of this patent includes a double-layer substrate, with several corrugated plastic ribs spaced between the two substrate layers. These ribs are made of hollow high-density polyethylene and have ventilation holes that penetrate both the upper and lower substrate layers. This design aims to improve the overall tensile strength of the film using the corrugated ribs and achieve breathability using the ventilation holes.

[0004] However, the cross-section of its hollow plastic ribs is roughly cylindrical. The effective bonding surface between the ribs and the substrate is extremely small. When the composite film is subjected to external pressure, bending, and especially repeated rubbing during actual use, the peel strength is insufficient due to the small contact area, and the plastic ribs are very prone to delamination from the substrate, causing the composite film to delaminate. This severely damages the overall structural stability and service life of the film. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a high-strength polyethylene film structure to improve structural stability.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is: a high-strength polyethylene film structure, comprising a flexible rib and two polyethylene substrates, wherein the flexible rib is located between the two polyethylene substrates, the flexible rib has air guide holes along its own length direction, a first vent hole communicating with the air guide holes is formed on the side wall of the flexible rib, a second vent hole communicating with the first vent hole is formed on the polyethylene substrate, the overall cross-section of the flexible rib is I-shaped, a T-shaped anti-detachment groove is formed on the side of the polyethylene substrate facing the flexible rib, and the two sides of the flexible rib are respectively fixed in the two T-shaped anti-detachment grooves.

[0007] To achieve the above technical solution, when the composite film is stretched, squeezed, or repeatedly rubbed, the upper and lower flanges of the flexible ribs with an I-shaped cross-section are confined within the T-shaped anti-detachment grooves in the polyethylene substrate, forming a stable mechanical interlocking structure. Compared to a circular cross-section, the I-shaped design significantly increases the contact area between the flexible ribs and the polyethylene substrate; the inverted structure of the T-shaped anti-detachment grooves effectively resists peeling forces perpendicular to the film surface, restricting the rotation or detachment of the flexible ribs, thereby improving the interlayer peel strength and structural stability of the film and preventing delamination or separation during use.

[0008] As a preferred embodiment of this utility model, the second vent holes on the two polyethylene substrates are staggered.

[0009] To achieve the above technical solution, gas enters through a second vent on one side of the polyethylene substrate, then flows into the air guide holes within the flexible ribs, and flows along its length within the air guide holes, finally exiting through a staggered second vent on the other side of the polyethylene substrate. This staggered interconnection structure extends the gas exchange path, utilizing the surface tension of liquid water and the lack of a straight path to reduce the probability of direct penetration by external liquid water or large particulate pollutants, thus improving waterproof and dustproof effects while ensuring breathability.

[0010] As a preferred embodiment of this utility model, the polyethylene substrate has a tactile coating on the side opposite to the flexible rib, and a third vent is formed on the tactile coating, which is coaxially connected to the second vent.

[0011] To achieve the above technical solution, gas passes through the third vent on the tactile coating and directly enters the interior of the film through the second vent, which is coaxially connected to the third vent. The coaxial connection design ensures that the tactile coating does not block the original venting channels of the polyethylene substrate, guaranteeing gas flow. The tactile coating, laminated on the back of the polyethylene substrate, alters the smooth texture of the polyethylene substrate, giving the film surface specific tactile feedback.

[0012] In a preferred embodiment of the present invention, the tactile coating includes an adhesive layer and coarse particles distributed in the adhesive layer. The adhesive layer is fixed on a polyethylene substrate, and the particle size of the coarse particles is greater than the thickness of the adhesive layer.

[0013] To achieve the above technical solution, the particle size of the coarse particles is larger than the thickness of the adhesive layer. The bottom of the coarse particles is covered and fixed to the surface of the polyethylene substrate by the adhesive layer, while the top of the coarse particles protrudes from the adhesive layer surface. This microstructure creates uniformly distributed physical protrusions on the film surface, increasing surface roughness, giving the film a dry, paper-like or fabric-like feel, eliminating the stickiness caused by a smooth surface, and improving the diffuse reflection properties of the surface.

[0014] In a preferred embodiment of this invention, the adhesive layer comprises a modified polyethylene hot melt adhesive layer.

[0015] To achieve the above technical solution, the modified polyethylene hot melt adhesive layer and the polyethylene substrate both belong to polyolefin materials, achieving molecular-level fusion bonding during hot-pressing. After cooling and curing, the modified polyethylene hot melt adhesive layer provides high interfacial bonding strength, preventing the tactile coating from peeling off, and possesses thermoplastic elastomer properties, allowing it to bend synchronously with the polyethylene substrate, thus preventing brittle cracking of the tactile coating during repeated folding.

[0016] As a preferred embodiment of this utility model, the coarse particles include calcium carbonate, talc, or silicon dioxide powder.

[0017] To achieve the above technical solution, calcium carbonate, talc, or silica powder are used as coarse microparticles to adjust the physical properties of the tactile coating. Calcium carbonate imparts a rough feel to the coating, talc provides a smooth texture, and silica powder provides a fine matte finish. These inorganic microparticles have high hardness and good chemical stability, providing a durable improvement in tactile feel while reducing manufacturing costs.

[0018] In a preferred embodiment of this utility model, the polyethylene substrate is wound onto a take-up drum to form a polyethylene roll, and the two ends of the take-up drum extend from the two ends of the polyethylene roll.

[0019] To achieve the above technical solution, the polyethylene substrate is tightly wrapped around the outer wall of the winding drum to form a polyethylene roll. The structures extending from both ends of the winding drum provide standardized support interfaces for the installation of handling or unwinding equipment, facilitating the suspension support and rotation of the polyethylene roll, thereby improving logistics efficiency.

[0020] As a preferred embodiment of this utility model, a protective plate is provided at the end of the polyethylene roll. The protective plate is threadedly connected to the outer wall of the winding drum, and a protective pad for contacting the end of the polyethylene roll is connected to the side of the protective plate facing the polyethylene roll.

[0021] To achieve the above technical solution, the protective plate is screwed onto the outer wall of the winding drum via a threaded connection, driving the protective pad to axially press the end face of the polyethylene roll. The protective pad uses elastic deformation to apply axial preload to the interlayer gaps of the polyethylene roll, preventing interlayer misalignment caused by transportation vibration; the protective plate resists impacts from hard objects on the edge of the polyethylene roll, avoiding end face damage that could lead to film tearing. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a high-strength polyethylene film; Figure 2 A schematic diagram illustrating the transverse cross-sectional structure of the flexible rib; Figure 3A schematic diagram illustrating the longitudinal cross-sectional structure of the flexible rib; Figure 4 This is a schematic diagram of the external structure of this utility model; Figure 5 This is a schematic diagram of the exploded structure of this utility model.

[0023] Reference numerals: 1. Polyethylene substrate; 2. Flexible rib; 3. T-shaped anti-detachment groove; 4. Air vent; 5. First air vent; 6. Second air vent; 7. Third air vent; 8. Tactile coating; 9. Adhesive layer; 10. Coarse particles; 11. Polyethylene roll; 12. Protective plate; 13. Round hole; 14. Protective pad; 15. Rewinding drum. 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 high-strength polyethylene film structure includes a flexible rib 2 and two polyethylene substrates 1. The flexible rib 2 is located between the two polyethylene substrates 1 and is made of metallocene polyethylene. The overall cross-section of the flexible rib 2 is I-shaped. A T-shaped anti-detachment groove 3 is formed on the side of the polyethylene substrate 1 facing the flexible rib 2, and the two sides of the flexible rib 2 are respectively fixed in the two T-shaped anti-detachment grooves 3.

[0026] The flexible rib 2 is fixed to the two polyethylene substrates 1 through an online hot-pressing composite process. Specifically, since the flexible rib 2 is made of metallocene polyethylene, it has excellent material compatibility with the polyethylene substrates 1. During the composite process, a preset temperature and pressure are applied to the upper and lower polyethylene substrates 1 by hot-pressing rollers, causing the side of the polyethylene substrates 1 facing the flexible rib 2 to soften due to heat. Under the action of pressure, the softened polyethylene substrates 1 tightly adhere to the I-shaped contour of the flexible rib 2 and undergo plastic deformation, thereby forming a T-shaped anti-detachment groove 3 in situ on the polyethylene substrates 1 that covers the flange of the flexible rib 2.

[0027] Simultaneously, the surface of the flexible rib 2 made of metallocene polyethylene undergoes interpenetration and diffusion of molecular chains at the contact interface with the polyethylene substrate 1, forming a molecular-level fusion bond. After cooling and shaping, the flexible rib 2 is firmly positioned between the two polyethylene substrates 1 through the dual action of mechanical embedding and thermal fusion bonding, effectively resisting interlayer peeling force and lateral shear force.

[0028] The flexible rib 2 has air guide holes 4 along its length, and a first vent hole 5 communicating with the air guide holes 4 is formed on the side wall of the flexible rib 2. Multiple first vent holes 5 are arranged along the length of the flexible rib 2. A second vent hole 6 communicating with the first vent holes 5 is formed on the polyethylene substrate 1.

[0029] The first vent 5 located on the upper side of the flexible rib 2 and the first vent 5 located on the lower side of the flexible rib 2 are offset from each other. That is, the second vent 6 on both sides of the flexible rib 2 are also offset.

[0030] A tactile coating 8 is laminated on the side of the polyethylene substrate 1 facing away from the flexible rib 2, and a third vent 7 is provided on the tactile coating 8, which is coaxially connected with the second vent 6.

[0031] The first vent 5, the second vent 6, and the third vent 7 are manufactured by mechanical needle punching after the flexible rib 2 is hot-pressed and laminated with the polyethylene substrate 1 and the tactile coating 8.

[0032] The tactile coating 8 includes an adhesive layer 9 and coarse particles 10 distributed in the adhesive layer 9. The adhesive layer 9 is fixed to the polyethylene substrate 1, and the particle size of the coarse particles 10 is larger than the thickness of the adhesive layer 9 so that a portion of the coarse particles 10 can protrude from the adhesive layer 9.

[0033] The adhesive layer 9 is a modified polyethylene hot melt adhesive layer. The coarse particles 10 are made of calcium carbonate, talc, or silica powder. In this embodiment, silica powder is selected as the coarse particles 10.

[0034] The polyethylene substrate 1 is wound onto the take-up drum 15 to form a polyethylene roll 11. Both ends of the take-up drum 15 extend from both ends of the polyethylene roll 11, and external thread sections are respectively provided on the outer walls of both ends of the take-up drum 15.

[0035] A protective plate 12 is provided at the end of the polyethylene roll 11. A circular hole 13 is formed in the middle of the protective plate 12, and an internal thread that mates with the external thread section is formed on the inner wall of the circular hole 13. The end of the winding drum 15 is fixed in the circular hole 13 of the protective plate 12 by a threaded connection. A protective pad 14 is fixed on the side of the protective plate 12 facing the polyethylene roll 11 for contacting the end of the polyethylene roll 11.

[0036] The winding drum 15 and the guard plate 12 are both made of engineering plastics, while the protective pad 14 is made of rubber.

[0037] 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 high-strength polyethylene film structure, comprising a flexible rib (2) and two polyethylene substrates (1), wherein the flexible rib (2) is located between the two polyethylene substrates (1), the flexible rib (2) has an air guide hole (4) along its length direction, a first vent hole (5) communicating with the air guide hole (4) is formed on the side wall of the flexible rib (2), and a second vent hole (6) communicating with the first vent hole (5) is formed on the polyethylene substrate (1), characterized in that: The flexible rib (2) has an I-shaped cross-section. The polyethylene substrate (1) has a T-shaped anti-detachment groove (3) on one side facing the flexible rib (2). The two sides of the flexible rib (2) are respectively fixed in the two T-shaped anti-detachment grooves (3).

2. The high-strength polyethylene film structure according to claim 1, characterized in that: The second vent holes (6) on the two polyethylene substrates (1) are staggered.

3. The high-strength polyethylene film structure according to claim 1, characterized in that: The polyethylene substrate (1) has a tactile coating (8) on the side opposite to the flexible rib (2), and the tactile coating (8) has a third vent (7) that is coaxially connected to the second vent (6).

4. The high-strength polyethylene film structure according to claim 3, characterized in that: The tactile coating (8) includes an adhesive layer (9) and coarse particles (10) distributed in the adhesive layer (9). The adhesive layer (9) is fixed on a polyethylene substrate (1). The particle size of the coarse particles (10) is greater than the thickness of the adhesive layer (9).

5. A high-strength polyethylene film structure according to claim 4, characterized in that: The adhesive layer (9) includes a modified polyethylene hot melt adhesive layer.

6. The high-strength polyethylene film structure according to claim 4, characterized in that: The coarse particles (10) include calcium carbonate, talc, or silica powder.

7. A high-strength polyethylene film structure according to any one of claims 1-6, characterized in that: The polyethylene substrate (1) is wound around a take-up drum (15) to form a polyethylene roll (11), with both ends of the take-up drum (15) extending from both ends of the polyethylene roll (11).

8. A high-strength polyethylene film structure according to claim 7, characterized in that: The end of the polyethylene roll (11) is provided with a guard plate (12), which is threaded to the outer wall of the winding drum (15). The side of the guard plate (12) facing the polyethylene roll (11) is connected with a protective pad (14) for contacting the end of the polyethylene roll (11).

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