Microprismatic retroreflective film

Abstract

This utility model discloses a microprism reflective film, comprising a release layer, a pressure-sensitive adhesive layer, a reflective layer, a PMMA layer, and a protective film layer connected in sequence. The reflective layer includes a prism layer, which further includes a first prism layer and a second prism layer. The melt index of the first prism layer is higher than that of the second prism layer. The first prism layer is provided with microprisms. By setting the first and second prism layers with different melt indices, the flowability and molding effect of each layer can be better controlled during the production process. At the same time, the microprism structure of the first prism layer can effectively improve the optical properties of the film, enabling the film to exhibit superior performance in optical applications. High melt index materials have low molding temperatures and good flowability, allowing for better mold filling and reducing energy consumption. Low melt index materials have better temperature resistance. The two have different melting temperatures; the high melt index material can be easily molded at 240°C, while the low melt index material can provide some support to prevent the overall film material from slipping.

Description

Technical Field

[0001] This utility model relates to the field of thin film production technology, and in particular to a microprism reflective film. Background Technology

[0002] Reflective films are widely used in road traffic signs, vehicle license plates, warning clothing, and outdoor advertising. Their core function is to efficiently reflect incident light back towards the light source at night or in low-light environments, thereby significantly improving visibility and safety. Existing reflective films typically consist of a multi-layered composite structure including a release layer, a pressure-sensitive adhesive layer, a reflective layer, a PMMA (polymethyl methacrylate) layer, and a protective film layer. The optical properties of the reflective layer directly determine the reflectivity, viewing angle, and weather resistance.

[0003] Traditional reflective layers often employ a single-layer microprism structure, formed by directly molding or hot-pressing V-shaped, cubic, or other geometrically shaped microprisms onto the surface of a PMMA substrate. However, single-layer microprism structures suffer from difficulties in matching melt flow indexes. The microprism layer needs to possess both good molding flowability (high melt flow index) and sufficient mechanical strength and heat resistance (low melt flow index). Using a single material often fails to simultaneously meet the requirements for high-brightness molding and rapid demolding, thus necessitating improvements. Summary of the Invention

[0004] This invention addresses the shortcomings of existing technologies, such as the tendency for films to easily adhere to molds or peripheral silicone rollers, by providing a microprism reflective film.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: A microprism reflective film includes a release layer, a pressure-sensitive adhesive layer, a reflective layer, a PMMA layer, and a protective film layer connected in sequence. The reflective layer includes a prism layer, which includes a first prism layer and a second prism layer. The melt index of the first prism layer is higher than that of the second prism layer. The first prism layer is provided with microprisms.

[0006] By setting prism layers one and two with different melt indices, the flowability and molding effect of each layer can be better controlled during the production process. Simultaneously, the microprism structure of prism layer one can effectively improve the optical properties of the film, such as reflection and light guidance, resulting in superior performance in optical applications. High melt index materials have lower molding temperatures and better flowability, allowing for better mold filling and reducing energy consumption. Low melt index materials have better temperature resistance. While their melting temperatures differ—high melt index materials can be easily molded at 240°C—low melt index materials can still provide some support to help the overall film material move.

[0007] Preferably, the microprism reflective film described above has a melt index in the range of 20-34 g / 10 min for the prism layer.

[0008] Limiting the melt flow index range of a single prism layer ensures suitable fluidity during processing, facilitates molding, and minimizes defects. It also guarantees sufficient mechanical strength and stability in subsequent use, further optimizing the optical and physical properties of the thin film.

[0009] Preferably, the microprism reflective film described above has a prism two-layer melt index ranging from 6 to 10 g / 10 min.

[0010] Limiting the melt flow index of the second prism layer to this range allows it to have lower fluidity during processing, enabling it to better cooperate with the first prism layer to form a stable structure. This also helps improve the overall performance of the reflective layer, such as reflectivity and durability.

[0011] Preferably, in the microprism reflective film described above, the thickness of the prism layer is 100-200 μm.

[0012] Limiting the thickness range of a single prism layer ensures that it has appropriate optical effects and mechanical strength within the thin film. This allows the microprism to function effectively without increasing costs or affecting the performance of other layers due to excessive thickness, thus achieving the best balance in the overall performance of the thin film.

[0013] Preferably, in the microprism reflective film described above, the thickness of the two prism layers ranges from 30 to 70 μm.

[0014] The thickness range of the two prism layers is limited. The two layers primarily serve as an insulator, ensuring that one side of the prism is heated and melted to form the structure while the other side remains unaffected, thus guaranteeing the formation of the membrane material.

[0015] Preferably, in the microprism reflective film described above, the PMMA layer includes a color layer and a transparent layer.

[0016] By setting color and transparent layers in the PMMA layer, the color and transparency of the film can be adjusted as needed, enabling the film to meet the appearance requirements of different application scenarios while maintaining good optical performance, thus increasing the film's applicability and market competitiveness.

[0017] Preferably, in the microprism reflective film described above, the reflective layer further includes a support layer, one side of which is connected to the pressure-sensitive adhesive layer, and the other side of which is connected to the side of the prism layer where the microprism is disposed, forming an air-sealed capsule.

[0018] By setting a support layer and forming an air-sealed capsule, the structural stability and optical performance of the reflective layer can be effectively improved. The air-sealed capsule can play a good role in reflection and heat insulation, further improving the performance and service life of the film, and making it more widely applicable in the fields of optics and heat insulation.

[0019] Preferably, in the microprism reflective film described above, the second prism layer is a transparent layer.

[0020] By making the second prism layer transparent, light can be ensured to pass smoothly through the second prism layer and be reflected by the microprisms of the first prism layer, thereby improving the optical effect of the reflective layer and enabling the thin film to exhibit better reflective performance and light guiding ability in optical applications.

[0021] Preferably, in the microprism reflective film described above, the prism layer is a frosted layer.

[0022] The frosted layer provides a larger heat-receiving area, resulting in faster heating during the molding of microprism structures. This allows for quicker mold filling and faster molding. Simultaneously, the frosted layer also facilitates air venting, allowing for better winding during film production. Preferably, in the microprism reflective film described above, the prism layer is a transparent layer.

[0023] The transparent layer takes longer to form, but the molten material fills and replicates the mold better. Compared to products made with frosted film, the brightness is improved to some extent, with a measured value of about 3%. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1 The present invention will be further described in detail with reference to specific embodiments, but these are not intended to limit the present invention: Example

[0026] A microprism reflective film includes a release layer 1, a pressure-sensitive adhesive layer 2, a reflective layer 3, a PMMA layer 4, and a protective film layer 5 connected in sequence. The reflective layer 3 includes a prism layer 31, which includes a first prism layer 311 and a second prism layer 312. The melt index of the first prism layer 311 is higher than that of the second prism layer 312. The first prism layer 311 is provided with microprisms.

[0027] Preferably, the melt flow index of the prism layer 311 is in the range of 20 g / min.

[0028] Preferably, the melt flow index of the prism layer 312 is in the range of 6 g / min.

[0029] Preferably, the thickness of the prism layer 311 is 100 μm.

[0030] Preferably, the thickness of the second prism layer 312 is in the range of 30 μm.

[0031] Preferably, the PMMA layer 4 includes a color layer 41 and a transparent layer 42.

[0032] Preferably, the reflective layer 3 further includes a support layer 32, one side of which is connected to the pressure-sensitive adhesive layer 2, and the other side of which is connected to the side of the prism layer 311 where the microprism is provided, forming an air-sealed capsule.

[0033] Preferably, the second prism layer 312 is a transparent layer.

[0034] Preferably, the prism layer 311 is a frosted layer. Example

[0035] The remaining steps are the same as in Example 1.

[0036] Preferably, the prism layer 311 is a transparent layer. Example

[0037] A microprism reflective film includes a release layer 1, a pressure-sensitive adhesive layer 2, a reflective layer 3, a PMMA layer 4, and a protective film layer 5 connected in sequence. The reflective layer 3 includes a prism layer 31, which includes a first prism layer 311 and a second prism layer 312. The melt index of the first prism layer 311 is higher than that of the second prism layer 312. The first prism layer 311 is provided with microprisms.

[0038] Preferably, the melt flow index of the prism layer 311 is in the range of 34 g / min.

[0039] Preferably, the melt flow index of the prism layer 312 is in the range of 10 g / min.

[0040] Preferably, the thickness of the prism layer 311 is 200 μm.

[0041] Preferably, the thickness of the second prism layer 312 is in the range of 70 μm.

[0042] Preferably, the PMMA layer 4 includes a color layer 41 and a transparent layer 42.

[0043] Preferably, the reflective layer 3 further includes a support layer 32, one side of which is connected to the pressure-sensitive adhesive layer 2, and the other side of which is connected to the side of the prism layer 311 where the microprism is provided, forming an air-sealed capsule.

[0044] Preferably, the second prism layer 312 is a transparent layer.

[0045] Preferably, the prism layer 311 is a frosted layer. Example

[0046] A microprism reflective film includes a release layer 1, a pressure-sensitive adhesive layer 2, a reflective layer 3, a PMMA layer 4, and a protective film layer 5 connected in sequence. The reflective layer 3 includes a prism layer 31, which includes a first prism layer 311 and a second prism layer 312. The melt index of the first prism layer 311 is higher than that of the second prism layer 312. The first prism layer 311 is provided with microprisms.

[0047] Preferably, the melt flow index of the prism layer 311 is in the range of 27 g / min.

[0048] Preferably, the melt flow index of the prism layer 312 is in the range of 8 g / min.

[0049] Preferably, the thickness of the prism layer 311 is 150 μm.

[0050] Preferably, the thickness of the second prism layer 312 is in the range of 30-70 μm.

[0051] Preferably, the PMMA layer 4 includes a color layer 41 and a transparent layer 42.

[0052] Preferably, the reflective layer 3 further includes a support layer 32, one side of which is connected to the pressure-sensitive adhesive layer 2, and the other side of which is connected to the side of the prism layer 311 where the microprism is provided, forming an air-sealed capsule.

[0053] Preferably, the second prism layer 312 is a transparent layer.

[0054] Preferably, the prism layer 311 is a frosted layer.

[0055] In summary, the above description is only a preferred embodiment of the present utility model. All equivalent changes and modifications made within the scope of the patent application of the present utility model shall be covered by the present utility model.

Claims

1. A microprism reflective film, characterized in that: The material includes a release layer (1), a pressure-sensitive adhesive layer (2), a reflective layer (3), a PMMA layer (4), and a protective film layer (5) connected in sequence. The reflective layer (3) includes a prism layer (31), which includes a first prism layer (311) and a second prism layer (312). The melt index of the first prism layer (311) is higher than that of the second prism layer (312). The first prism layer (311) is provided with microprisms.

2. The microprism reflective film according to claim 1, characterized in that: The melt index of the prism layer (311) ranges from 20 to 34 g / 10 min.

3. The microprism reflective film according to claim 1, characterized in that: The melt index of the prism two-layer (312) ranges from 6 to 10 g / 10 min.

4. The microprism reflective film according to claim 1, characterized in that: The thickness of the prism layer (311) is 100-200 μm.

5. The microprism reflective film according to claim 1, characterized in that: The thickness of the two layers (312) of the prism is in the range of 30-70 μm.

6. The microprism reflective film according to claim 1, characterized in that: The PMMA layer (4) includes a color layer (41) and a transparent layer (42).

7. The microprism reflective film according to claim 1, characterized in that: The reflective layer (3) also includes a support layer (32), one side of which is connected to the pressure-sensitive adhesive layer (2), and the other side of which is connected to the side of the prism layer (311) where the microprism is provided, forming an air-sealed capsule.

8. The microprism reflective film according to claim 1, characterized in that: The second layer (312) of the prism is a transparent layer.

9. The microprism reflective film according to claim 8, characterized in that: The prism layer (311) is a frosted layer.

10. The microprism reflective film according to claim 8, characterized in that: The first layer (311) of the prism is a transparent layer.

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