Manufacturing method of micro-prismatic reflective film mold integrating two triangular pyramids and reflective film

Abstract

The present invention provides a method for manufacturing a microprismatic reflective film mold integrating two triangular pyramids and the reflective film. The mold manufacturing method includes: 1. rotating a mold substrate on a B-axis turntable to 0 degrees, 120 degrees, and 60 degrees, respectively, and using a first type of tool with a tool angle α mounted on a fly cutter disc to process the first to third cuts; 2. based on the structure processed in step 1, rotating the mold substrate to positions of 0 degrees, 120 degrees, and 60 degrees, and performing the fourth to sixth cuts. In the fourth to sixth cuts, two cuts are processed using the first type of tool, and the other cut is processed using the second type of tool. The first and second types of tools are symmetrical tools with the same inclination angle on both sides. The present invention can increase the degree of freedom of optical design, obtain better performance indicators under different application conditions, and reduce the impact of large cone angle deviation processing or asymmetric design on the optimized balanced retroreflective performance of the 0 / 90 / 180 degree orientation reflective film.

Description

Technical Field

[0001] The invention relates to a method for manufacturing a micro-prism reflective film mold integrating two triangular pyramids and the reflective film. Background Art

[0002] Design of micro-prismatic reflective film based on triangular pyramid unit structure: use one tool to process the three pyramidal surfaces of the triangular pyramid, and the inclination angles of the three pyramidal reflective surfaces are the same as the angle between them and the vertical plane, such as Figure 1 As shown. This type of micro-prismatic reflective film design is mainly used for Class III and IV reflective films with low performance requirements. When used for Class V reflective film, the retroreflection coefficient cannot meet the standard requirements under conditions of large observation angles and large incident angles. In order to achieve the performance requirements of Class V reflective film, different design or manufacturing solutions have been proposed at home and abroad. 3M Company of the United States proposed a reflective film optical design using a full prism structure. However, this design has a complex structure and requires very high mold manufacturing precision. In addition, the manufacturing error has a great impact on the performance of the reflective film, which has limited its promotion and application in China.

[0003] Specifically, the above Figure 1 The optical design variable of the microprismatic reflective film is only one, that is, the angles of the three corner cones of each triangular pyramid are the same. It is difficult to obtain different incident angles and observation angles, especially wide angles, that is, the simultaneous improvement of the retroreflective performance at different azimuths, as well as the balance between the retroreflective performance at different incident angles and observation angles, especially wide angles and small incident angles, and the balance between the retroreflective performance at different azimuths such as 0 degrees, 90 degrees, and 180 degrees.

[0004] In the prior art, in order to achieve isotropic uniformity in the retroreflective performance of reflective sheeting at different azimuth angles, four types of reflective sheeting nickel molds are typically produced by mechanically interlocking and splicing two reflective sheeting nickel molds with different orientations, one at 0 degrees and the other at 90 degrees, to produce a roller master mold. This method achieves control of the retroreflective performance of the reflective sheeting, such as improving wide-angle performance, by slightly adjusting an angle to deviate from the standard corner cone reflector structure. However, the above method is very cumbersome to produce and suffers from mechanical splicing errors, making it difficult to achieve the desired effect.

[0005] Although the retroreflective performance of the microprismatic reflective film produced by 3M in the United States using full prisms is 50% higher than that of the microprismatic reflective film using triangular pyramids, or the effective reflection area of ​​the triangular pyramid reflective film is 66.67% of the effective reflection area of ​​the full pyramid reflective film, the mold structure of the full pyramid reflective film, such as Chinese patent No. 2015107772604 and 201811202555.9, is very complex and difficult to manufacture. In addition, the reflective performance is much lower than expected due to mold manufacturing errors, which limits its promotion and application.

[0006] In response to the above-mentioned shortcomings, the applicant applied for publication number CN 117930406 A of “Retro-reflective microprism array structure and its manufacturing method” in March 2024 and publication number CN118759624B of “Manufacturing method of microprismatic reflective film with double triangular pyramid combination structure and its mold” in September 2024.

[0007] Among them, although the "retro-reflective micro-prism array structure and its manufacturing method" is more convenient to manufacture than patents 2015107772604 and 201811202555.9, avoids the difficulty of secondary clamping and special-shaped surface processing, and ensures the quality of the finished product, when making through holes on the second substrate in the processing process, it is necessary to drill holes one by one and then process them by wire cutting. The processing process is still relatively cumbersome, and the corner cones formed by the processing are all regular triangular pyramids with the same inclination angle of the corner cone surface. The optical design variable of the micro-prismatic reflective film produced therefrom is only one, and it is difficult to obtain different incident angles and observation angles. That is, such a micro-prismatic reflective film design can meet the performance requirements of Class IV reflective film. When used for Class V reflective film, the retroreflection coefficient cannot meet the standard requirements under the conditions of large observation angles and large incident angles;

[0008] Among them, the "manufacturing method of micro-prismatic reflective film with a double triangular pyramid combination structure and its mold" improves the wide-angle retroreflective performance of the reflective film to a certain extent and achieves the expected goal by regulating the retroreflective performance of the triangular pyramid B; however, because the area ratio of the triangular pyramids A and B in the double triangular pyramid combination structure is 75%:25%, the area of ​​the pure triangular pyramid B used to optimize the wide-angle performance accounts for only 25%, which limits the further improvement of the wide-angle retroreflective performance of the reflective film. Summary of the Invention

[0009] In view of the above-mentioned problems, the purpose of the present invention is to provide a method for manufacturing a micro-prismatic reflective film mold integrating two triangular pyramids and a reflective film. The method for manufacturing a micro-prismatic reflective film mold integrating two triangular pyramids and the reflective film are rationally designed, can increase the degree of freedom of optical design, obtain better performance indicators under different application conditions, and can reduce the impact of large cone angle deviation processing or asymmetric design on the optimized balanced 0 / 90 / 180 degree orientation retroreflective performance of the reflective film.

[0010] The technical solutions of the present invention are as follows:

[0011] The method for manufacturing a micro-prismatic reflective film mold integrating two triangular pyramids of the present invention is characterized by:

[0012] The mold base is mounted horizontally on a workbench, which can move the mold base along the horizontal X-axis and Y-axis. The B-axis turntable on the workbench can drive the mold base to rotate around the B-axis, which is the normal line of the mold base. A spindle parallel to the upper surface of the mold base and a fly cutter head fixedly connected to the spindle are provided above the mold base. The fly cutter head is equipped with a replaceable tool, which can rotate around the Y-axis driven by the spindle. The specific steps of manufacturing are as follows:

[0013] S1. Rotate the mold substrate on the B-axis turntable to 0, 120, and 60 degrees, respectively. Use the first type of tool array with a tool angle of α mounted on the fly cutter disc to machine the four side cone surfaces and two diagonal cone surfaces of the parallelogram unit, i.e., the first to third cuts. The first type of tool is a symmetrical tool with the same inclination angle on both sides. The inclination angle of the machined cone surface of the mold is α / 2.

[0014] S2. Based on the structure processed in step S1, the mold substrate is rotated to positions of 0 degrees, 120 degrees, and 60 degrees, and array processing from the fourth to the sixth cuts is performed. In the fourth to sixth cuts, two cuts are processed using the first cutter, and the other cut is processed using the second cutter. The second cutter is a symmetrical cutter with the same inclination angle on both sides. The inclination angle of the processed cone surface of the mold is β / 2;

[0015] At this point, a microprismatic reflective film mold integrating two triangular pyramids is obtained. The two triangular pyramids are triangular pyramid A and triangular pyramid B. The area ratio of triangular pyramid A and triangular pyramid B is 50%:50%. The inclination angles of the three cone surfaces of each triangular pyramid A are α / 2, the inclination angles of the two cone surfaces of each triangular pyramid B are α / 2, and the inclination angle of one cone surface of each triangular pyramid B is β / 2.

[0016] Preferably, the fourth cut is made using the second type of cutter, and the fifth and sixth cuts are made using the first type of cutter.

[0017] Preferably, the fifth cut is made using the second type of cutter, and the fourth and sixth cuts are made using the first type of cutter.

[0018] Preferably, the sixth cut is made using the second type of cutter, and the fourth and fifth cuts are made using the first type of cutter.

[0019] Preferably, the blade angle of the first type of tool is 70.55 degrees, and the blade angle of the second type of tool is 70.90 degrees. The first to third cuts are processed using the first type of tool, and the mold substrate is rotated to 0 degrees, 120 degrees and 60 degrees respectively, with an array spacing of 0.433 mm; the fourth and fifth cuts are processed using the first type of tool, and the mold substrate is rotated to 0 degrees and 120 degrees respectively, with an array spacing of 0.433 mm; the sixth cut is processed using the second type of tool, and the mold substrate is rotated to 60 degrees, with an array spacing of 0.433 mm; a microprismatic reflective film mold with an integrated combination structure of two triangular pyramids is processed and formed: the side length of the triangular pyramid is 250 microns, and the area ratio of triangular pyramid A and triangular pyramid B is 1:1.

[0020] Preferably, the specific processing steps are as follows:

[0021] Step 1: Rotate the mold base on the B-axis turntable to 0 degrees, and use the first type of tool array with a tool angle of α installed on the fly cutter disc to machine the two side conical surfaces of the parallelogram unit. The inclination angle of the conical surface is α / 2.

[0022] Step 2: Rotate the mold base on the B-axis turntable to 120 degrees, and use the first tool array with a tool angle of α installed on the fly cutter disc to machine the other two conical surfaces of the parallelogram unit. The inclination angle of the conical surface is α / 2.

[0023] Step 3: Rotate the mold base material on the B-axis turntable to 60 degrees, and use the first type of tool array with a tool angle of α installed on the fly cutter disc to machine the conical surfaces of the two diagonal corners of the parallelogram unit 1, with the inclination angle of the conical surfaces being α / 2;

[0024] Step 4: Based on the structure processed in step 3, rotate the mold substrate to the 0 degree position, and use the second tool array to form a cone with an inclination angle of β / 2;

[0025] Step 5: Rotate the mold substrate 120 degrees in sequence and use the first tool array for processing, with the cone surface inclination angle being α / 2;

[0026] Step 6: Rotate the mold substrate 60 degrees again and use the first tool array for processing, with the cone inclination angle being α / 2.

[0027] The present invention integrates two types of triangular pyramids into a microprismatic reflective film. The surface of the microprismatic reflective film is formed by an array of identical parallelogram units. Each parallelogram unit is composed of four identical triangular pyramids A and four mixed triangular pyramids B. The bases of the triangular pyramids A and the mixed triangular pyramids B are both identical equilateral triangles. The area ratio of the triangular pyramids A and the mixed triangular pyramids B is 1:1. The inclination angles of the three cone surfaces of each triangular pyramid A are all α / 2, the inclination angles of the two cone surfaces of each triangular pyramid B are α / 2, and the inclination angle of one cone surface of each triangular pyramid B is β / 2.

[0028] Preferably, the above-mentioned α=70.55 degrees and β=70.90 degrees.

[0029] Preferably, the array intercept of the microprismatic reflective film is 0.433 mm.

[0030] The present invention has the following technical advantages.

[0031] 1. Optimized area ratio: The area ratio of the triangular pyramid A and the mixed triangular pyramid B in the present invention is 50%:50%. Compared with the "Microprismatic reflective film with a double triangular pyramid combination structure and a method for manufacturing a mold thereof" published in publication No. CN118759624B, the area ratio of the triangular pyramid B is increased from 25% to 50%, which is beneficial to improving the wide-angle retroreflective performance of the reflective film.

[0032] 2. The optimization design is convenient. It only needs to select a cone angle β / 2 of the triangular pyramid B to optimize and improve the wide-angle retroreflective performance of the reflective film.

[0033] 3. The processing technology is simple. The first type of tool α can be used to fly cut five times, and the second type of tool β can be used to fly cut one time. It is much simpler and lower in cost than the manufacturing of 3M full prism mold.

[0034] 4. The design verification is simple. First, optimize and verify the pure triangular pyramid A (α / 2, α / 2, α / 2), then optimize and verify the mixed triangular pyramid B (α / 2, α / 2, β / 2), and finally verify the double triangular pyramid combination structure A+B. The verification is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described below with reference to the accompanying drawings;

[0036] Figure 1 This is the main view of a traditional triangular pyramid;

[0037] Figure 2 It is a three-dimensional schematic diagram of the mold substrate placed on the workbench for processing;

[0038] Figure 3 This is a schematic diagram of the cross-sectional structure of the mold base material processed using the first type of tool;

[0039] Figure 4 This is a schematic diagram of the cross-sectional structure of the mold base material processed using the second type of tool;

[0040] Figure 5 Schematic diagram of the main structure of the microprismatic reflective film (or finished mold product) of the present invention (only the fourth cut is processed with the second type of tool, and the others are processed with the first type of tool);

[0041] Figure 6Schematic diagram of the main structure of the microprismatic reflective film (or finished mold product) of the present invention (only the fifth cut is processed with the second type of tool, and the others are processed with the first type of tool);

[0042] Figure 7 Schematic diagram of the main structure of the microprismatic reflective film (or finished mold product) of the present invention (only the sixth cut is processed with the second type of tool, and the others are processed with the first type of tool);

[0043] Figure 8 This is a schematic diagram of the three-dimensional structure of the mold base material when it is not processed;

[0044] Figure 9 yes Figure 8 The main view;

[0045] Figure 10 yes Figure 8 The front view of the mold substrate after being processed in step 1;

[0046] Figure 11 yes Figure 10 The front view of the mold substrate after processing in step 2;

[0047] Figure 12 yes Figure 11 The front view of the mold substrate after processing in step 3;

[0048] Figure 13 yes Figure 12 Stereoscopic image of

[0049] Figure 14 yes Figure 12 The front view of the mold substrate after processing in step 4;

[0050] Figure 15 yes Figure 14 Schematic diagram of the three-dimensional structure;

[0051] Figure 16 yes Figure 14 The front view of the mold substrate after processing in step 5;

[0052] Figure 17 yes Figure 16 Schematic diagram of the three-dimensional structure;

[0053] Figure 18 yes Figure 16 The front view of the mold substrate after processing in step 6;

[0054] Figure 19 yes Figure 18 The three-dimensional structural diagram of is also the three-dimensional structural diagram of the finished mold of this application. DETAILED DESCRIPTION

[0055] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0056] The present invention relates to a method for manufacturing a microprismatic reflective film mold integrating two triangular pyramids. A mold substrate K1 is horizontally mounted on a workbench K2. The workbench can drive the mold substrate to move along the horizontal X-axis and Y-axis. A B-axis turntable on the workbench can drive the mold substrate to rotate about the normal B axis of the mold substrate. A spindle K3 parallel to the upper surface of the mold substrate and a fly cutter disk K4 fixedly connected to the spindle are provided above the mold substrate. A replaceable tool K5 is mounted on the fly cutter disk. The tool can rotate about the Y axis driven by the spindle. The specific manufacturing steps are as follows:

[0057] S1. Rotate the mold substrate on the B-axis turntable to 0, 120, and 60 degrees, respectively. Use the first type of tool array with a tool angle α mounted on the fly cutter disc to machine the four side conical surfaces and two diagonal conical surfaces of the parallelogram unit 1, i.e., the first to third cuts. The first type of tool is a symmetrical tool (no tool deflection angle) with the same inclination angle on both sides. The inclination angle of these machined mold conical surfaces is α / 2.

[0058] S2. Based on the structure processed in step S1, the mold substrate is rotated to positions of 0 degrees, 120 degrees, and 60 degrees, and array processing from the fourth to the sixth cuts is performed. Among the fourth to sixth cuts, two cuts are processed using the first cutter, and the other cut is processed using the second cutter (the cutter has no deflection angle). The second cutter is a symmetrical cutter with the same inclination angle on both sides. The inclination angle of the processed mold cone is β / 2;

[0059] At this point, a microprismatic reflective film mold integrating two triangular pyramids is obtained. The two triangular pyramids are triangular pyramid A and triangular pyramid B. The area ratio of triangular pyramid A and triangular pyramid B is 50%:50%. The inclination angles of the three cone surfaces of each triangular pyramid A are α / 2, the inclination angles of the two cone surfaces of each triangular pyramid B are α / 2, and the inclination angle of one cone surface of each triangular pyramid B is β / 2.

[0060] Among the processing of the 4th to 6th cuts, two cuts are processed using the first type of tool, and the other cut is processed using the second type of tool. For example, the 4th cut is processed using the second type of tool, and the 5th and 6th cuts are processed using the first type of tool; for another example, the 5th cut is processed using the second type of tool, and the 4th and 6th cuts are processed using the first type of tool; or the 6th cut is processed using the second type of tool, and the 4th and 5th cuts are processed using the first type of tool.

[0061] Taking the fourth cut being processed with the second tool and the fifth and sixth cuts being processed with the first tool as an example, the specific processing steps are as follows:

[0062] Step 1 (1st cut): Rotate the mold base material on the B-axis turntable to 0 degrees (or 180 degrees) (i.e. Figure 9As shown in the figure), the first tool array with a tool angle of α installed on the fly cutter disc is used to process the two side cone surfaces of the parallelogram unit body (i.e. Figure 10 The upper and lower conical surfaces of the mold are moved along the X-axis during the processing).

[0063] Step 2 (2nd cut): Rotate the mold base material on the B-axis turntable to 120 degrees (or 300 degrees) (i.e. Figure 9 In the state shown, rotate 120 degrees (or 300 degrees) counterclockwise around the center of the B axis) and use the first tool array with a tool angle of α installed on the fly cutter disc to machine the other two conical surfaces of the parallelogram unit body (i.e. Figure 11 The left and right conical surfaces of the mold are moved along the X-axis direction by the worktable during processing).

[0064] Step 3 (3rd cut): Rotate the mold base material on the B-axis turntable to 60 degrees (or 240 degrees) (i.e. Figure 9 In the state shown, rotate 60 degrees (or 240 degrees) counterclockwise around the center of the B axis, and use the first type of tool array with a tool angle of α installed on the fly cutter disc to machine the conical surfaces of the two diagonal corners of the parallelogram unit 1, as shown in Figure 12 、 13 shown.

[0065] Step 4 (4th cut): Based on the structure after step 3, rotate the mold substrate to the 0 degree position (that is, Figure 9 As shown in the figure), during the processing, the workbench drives the mold substrate to move along the X-axis direction, and the second tool array is used to form a cone with an inclination angle of β / 2; Figure 14 、 15 shown.

[0066] Step 5 (5th cut): Rotate the mold substrate 120 degrees (i.e. Figure 9 The mold base material is moved along the X-axis by the workbench during machining, as shown in the figure. Figure 16 、 17 As shown;

[0067] Step 6 (6th cut): Rotate the mold substrate 60 degrees (i.e. Figure 9 The mold base material is moved along the X-axis by the worktable during machining, as shown in the figure. Figure 18 、 19 shown.

[0068] Figure 18 、 19 That is, the structural diagram of the finished mold of this application, Figure 18 、19 and Figure 5 They are all schematic diagrams of the structure of the mold used to make the reflective film of the present application. The shape and size of the mold obtained by the above method are the same as the reflective film subsequently made by the mold.

[0069] Specific embodiment 1 of the mold manufacturing method, the blade angle of the first tool is 70.55 degrees, the blade angle of the second tool is 70.90 degrees, the first to third tools are processed using the first tool, the mold substrate is rotated to 0 degrees, 120 degrees and 60 degrees respectively, and the array spacing is 0.433mm; the fourth and fifth tools are processed using the first tool, the mold substrate is rotated to 0 degrees and 120 degrees respectively, and the array spacing is 0.433mm, the sixth tool is processed using the second tool, the mold substrate is rotated to 60 degrees, and the array spacing is 0.433mm; a microprismatic reflective film mold with an integrated combination structure of two triangular pyramids is processed and formed: the side length of the triangular pyramid is 250 microns, and the area ratio of triangular pyramid A and triangular pyramid B is 1:1.

[0070] Comparative example of mold making method: The difference between this comparative example and the above embodiment is that a flying cutter is used to process three cuts to form a triangular pyramid. The flying cutter is designed to have a cutting angle α=70.55°. The rotation axis B axis of the 1st to 3rd cutter equipment uses 0°, 60° and 120° respectively. The array spacing is 0.2165mm. The processed single triangular pyramid structure sample has a side length of 250 microns, and the inclination angles of the three cone surfaces of the triangular pyramid are α / 2, α / 2, and α / 2.

[0071] The test data of Example 1 and the comparative example are as follows:

[0072]

[0073] Compared with the comparative example, Example 1 of the present invention solves the problem that the retroreflective performance cannot meet the Class V standard under the test conditions of (observation angle 0.5°, incident angle 30°), (observation angle 1°, incident angle -4°), (observation angle 1°, incident angle 15°), and (observation angle 1°, incident angle 30°). At the same time, by reducing the interference performance at an observation angle of 0.2°, the retroreflective performance at an observation angle of 0.5° is improved.

[0074] The mold prepared by the above-mentioned manufacturing method is used to produce a microprismatic reflective film integrating two triangular pyramids. The surface of the microprismatic reflective film is formed by an array of identical parallelogram units 1. Each parallelogram unit 1 is composed of four identical triangular pyramids A and four mixed triangular pyramids B. The bases of the triangular pyramids A and the mixed triangular pyramids B are both identical equilateral triangles. The area ratio of the triangular pyramids A and the mixed triangular pyramids B is 1:1. The inclination angles of the three cone surfaces of each triangular pyramid A are all α / 2, the inclination angles of the two cone surfaces of each triangular pyramid B are α / 2, and the inclination angle of one cone surface of each triangular pyramid B is β / 2.

[0075] Among them, α=70.55 degrees, β=70.90 degrees; the array intercept of the microprismatic reflective film is 0.433 mm.

[0076] The present invention has the following technical advantages.

[0077] 1. Optimized area ratio: The area ratio of the triangular pyramid A and the mixed triangular pyramid B in the present invention is 50%:50%. Compared with the "Microprismatic reflective film with a double triangular pyramid combination structure and a method for manufacturing a mold thereof" published in publication No. CN118759624B, the area ratio of the triangular pyramid B is increased from 25% to 50%, which is beneficial to improving the wide-angle retroreflective performance of the reflective film.

[0078] 2. The optimization design is convenient. It only needs to select a cone angle β / 2 of the triangular pyramid B to optimize and improve the wide-angle retroreflective performance of the reflective film.

[0079] 3. The processing technology is simple. The first type of tool α can be used to fly cut five times, and the second type of tool β can be used to fly cut one time. It is much simpler and lower in cost than the manufacturing of 3M full prism mold.

[0080] 4. The design verification is simple. First, optimize and verify the pure triangular pyramid A (α / 2, α / 2, α / 2), then optimize and verify the mixed triangular pyramid B (α / 2, α / 2, β / 2), and finally verify the double triangular pyramid combination structure A+B. The verification is simple.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and not to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention. They should all be included in the scope of the technical solution for protection of the present invention.

Claims

1. A method for manufacturing a microprismatic reflective film mold integrating two triangular pyramids, characterized by: The mold base (K1) is horizontally mounted on a workbench (K2). The workbench can drive the mold base to move along the horizontal X-axis and Y-axis, and the B-axis turntable on the workbench can drive the mold base to rotate around the normal B-axis of the mold base. Above the mold base is a spindle (K3) parallel to the upper surface of the mold base and a flying cutter disc (K4) fixedly connected to the spindle. A replaceable tool (K5) is mounted on the flying cutter disc. The tool can rotate around the Y-axis driven by the spindle. The specific steps of manufacturing are as follows: S1. Rotate the mold substrate on the B-axis turntable to 0, 120, and 60 degrees, respectively. Use the first type of tool array with a tool angle of α mounted on the fly cutter disc to machine the four side conical surfaces and two diagonal conical surfaces of the parallelogram unit 1, i.e., the first to third cuts. The first type of tool is a symmetrical tool with the same inclination angle on both sides. The inclination angle of the machined mold conical surface is α / 2. S2. Based on the structure processed in step S1, the mold substrate is rotated to positions of 0 degrees, 120 degrees, and 60 degrees, and the fourth, fifth, and sixth cuts are performed. Two of the fourth, fifth, and sixth cuts are processed using the first cutter, and the other is processed using the second cutter. The second cutter is a symmetrical cutter with the same inclination angle on both sides. The inclination angle of the processed mold cone is β / 2. Thus, a microprismatic reflective film mold integrating two triangular pyramids is obtained. The two triangular pyramids are triangular pyramid A and triangular pyramid B. The area ratio of triangular pyramid A and triangular pyramid B is 50%:50%. The inclination angles of the three cone surfaces of each triangular pyramid A are α / 2, the inclination angles of the two cone surfaces of each triangular pyramid B are α / 2, and the inclination angle of one cone surface of each triangular pyramid B is β / 2. The first tool has a blade angle of 70.55 degrees, and the second tool has a blade angle of 70.90 degrees. The first to third cuts are processed using the first tool, and the mold substrate is rotated to 0 degrees, 120 degrees, and 60 degrees, respectively, with an array spacing of 0.433 mm; the fourth and fifth cuts are processed using the first tool, and the mold substrate is rotated to 0 degrees and 120 degrees, respectively, with an array spacing of 0.433 mm; the sixth cut is processed using the second tool, and the mold substrate is rotated to 60 degrees, with an array spacing of 0.433 mm; a micro-prismatic reflective film mold with an integrated structure of two triangular pyramids is processed and formed: the side length of the triangular pyramid is 250 microns, and the area ratio of triangular pyramid A and triangular pyramid B is 1:1; based on the above A mold prepared by the manufacturing method is used to produce a microprismatic reflective film integrating two triangular pyramids. The surface of the microprismatic reflective film is formed by an array of identical parallelogram units 1. Each parallelogram unit 1 is composed of four identical triangular pyramids A and four mixed triangular pyramids B. The bases of the triangular pyramids A and the mixed triangular pyramids B are both identical equilateral triangles. The area ratio of the triangular pyramids A and the mixed triangular pyramids B is 1:

1. The inclination angles of the three cone surfaces of each triangular pyramid A are all α / 2, the inclination angles of the two cone surfaces of each triangular pyramid B are α / 2, and the inclination angle of one cone surface of each triangular pyramid B is β / 2. α=70.55 degrees, β=70.90 degrees. The array intercept of the microprismatic reflective film is 0.433 mm.

2. A method for manufacturing a microprismatic reflective film mold integrating two triangular pyramids, characterized in that: The mold base (K1) is horizontally mounted on a workbench (K2). The workbench can drive the mold base to move along the horizontal X-axis and Y-axis, and the B-axis turntable on the workbench can drive the mold base to rotate around the normal B-axis of the mold base. Above the mold base is a spindle (K3) parallel to the upper surface of the mold base and a flying cutter disc (K4) fixedly connected to the spindle. A replaceable tool (K5) is mounted on the flying cutter disc. The tool can rotate around the Y-axis driven by the spindle. The specific steps of manufacturing are as follows: S1. Rotate the mold substrate on the B-axis turntable to 0, 120, and 60 degrees, respectively. Use the first type of tool array with a tool angle of α mounted on the fly cutter disc to machine the four side conical surfaces and two diagonal conical surfaces of the parallelogram unit 1, i.e., the first to third cuts. The first type of tool is a symmetrical tool with the same inclination angle on both sides. The inclination angle of the machined mold conical surface is α / 2. S2. Based on the structure processed in step S1, the mold substrate is rotated to positions of 0 degrees, 120 degrees, and 60 degrees, and the fourth, fifth, and sixth cuts are performed. Two of the fourth, fifth, and sixth cuts are processed using the first cutter, and the other is processed using the second cutter. The second cutter is a symmetrical cutter with the same inclination angle on both sides. The inclination angle of the processed mold cone is β / 2. At this point, a microprismatic reflective film mold integrating two triangular pyramids is obtained. The two triangular pyramids are triangular pyramid A and triangular pyramid B. The area ratio of triangular pyramid A and triangular pyramid B is 50%:50%. The inclination angles of the three cone surfaces of each triangular pyramid A are α / 2, the inclination angles of the two cone surfaces of each triangular pyramid B are α / 2, and the inclination angle of one cone surface of each triangular pyramid B is β / 2. The fourth cut is processed using the second tool, and the fifth and sixth cuts are processed using the first tool. The specific processing steps are as follows: Step 1: Rotate the mold base on the B-axis turntable to 0 degrees, and use the first type of tool array with a tool angle of α installed on the fly cutter disc to machine the two side conical surfaces of the parallelogram unit. The inclination angle of the conical surface is α / 2. Step 2: Rotate the mold base on the B-axis turntable to 120 degrees, and use the first tool array with a tool angle of α installed on the fly cutter disc to machine the other two conical surfaces of the parallelogram unit. The inclination angle of the conical surface is α / 2. Step 3: Rotate the mold base material on the B-axis turntable to 60 degrees, and use the first type of tool array with a tool angle of α installed on the fly cutter disc to machine the conical surfaces of the two diagonal corners of the parallelogram unit 1, with the inclination angle of the conical surfaces being α / 2; Step 4: Based on the structure processed in step 3, rotate the mold substrate to the 0 degree position, and use the second tool array to form a cone with an inclination angle of β / 2; Step 5: Rotate the mold substrate 120 degrees in sequence and use the first tool array for processing, with the cone surface inclination angle being α / 2; Step 6: Rotate the mold substrate 60 degrees and use the first tool array for processing, with the cone angle of α / 2. The mold made by the above-mentioned production method produces a microprismatic reflective film integrating two triangular pyramids. The surface of the microprismatic reflective film is formed by an array of identical parallelogram units 1. Each parallelogram unit 1 is composed of four identical triangular pyramids A and four mixed triangular pyramids B. The bases of the triangular pyramids A and the mixed triangular pyramids B are both identical equilateral triangles. The area ratio of the triangular pyramids A and the mixed triangular pyramids B is 1:

1. The inclination angles of the three cone surfaces of each triangular pyramid A are α / 2, the inclination angles of the two cone surfaces of each triangular pyramid B are α / 2, and the inclination angle of one cone surface of each triangular pyramid B is β / 2; α=70.55 degrees, β=70.90 degrees; the array intercept of the microprismatic reflective film is 0.433 mm.

3. A method for manufacturing a microprismatic reflective film mold integrating two triangular pyramids, characterized in that: The mold base (K1) is horizontally mounted on a workbench (K2). The workbench can drive the mold base to move along the horizontal X-axis and Y-axis, and the B-axis turntable on the workbench can drive the mold base to rotate around the normal B-axis of the mold base. Above the mold base is a spindle (K3) parallel to the upper surface of the mold base and a flying cutter disc (K4) fixedly connected to the spindle. A replaceable tool (K5) is mounted on the flying cutter disc. The tool can rotate around the Y-axis driven by the spindle. The specific steps of manufacturing are as follows: S1. Rotate the mold substrate on the B-axis turntable to 0, 120, and 60 degrees, respectively. Use the first type of tool array with a tool angle of α mounted on the fly cutter disc to machine the four side conical surfaces and two diagonal conical surfaces of the parallelogram unit 1, i.e., the first to third cuts. The first type of tool is a symmetrical tool with the same inclination angle on both sides. The inclination angle of the machined mold conical surface is α / 2. S2. Based on the structure processed in step S1, the mold substrate is rotated to positions of 0 degrees, 120 degrees, and 60 degrees, and the fourth, fifth, and sixth cuts are performed. Two of the fourth, fifth, and sixth cuts are processed using the first cutter, and the other is processed using the second cutter. The second cutter is a symmetrical cutter with the same inclination angle on both sides. The inclination angle of the processed mold cone is β / 2. Thus, a microprismatic reflective film mold integrating two triangular pyramids is obtained. The two triangular pyramids are triangular pyramid A and triangular pyramid B. The area ratio of triangular pyramid A and triangular pyramid B is 50%:50%. The inclination angles of the three cone surfaces of each triangular pyramid A are α / 2, the inclination angles of the two cone surfaces of each triangular pyramid B are α / 2, and the inclination angle of one cone surface of each triangular pyramid B is β / 2. The fifth cut is processed using the second cutter, and the fourth and sixth cuts are processed using the first cutter; a microprismatic reflective film integrating two triangular pyramids is produced by the mold made by the above-mentioned manufacturing method, wherein the surface of the microprismatic reflective film is formed by an array of identical parallelogram units 1, each parallelogram unit 1 is composed of four identical triangular pyramids A and four mixed triangular pyramids B, the bottom surfaces of the triangular pyramids A and the mixed triangular pyramids B are both identical equilateral triangles, the area ratio of the triangular pyramids A and the mixed triangular pyramids B is 1:1, the inclination angles of the three cone surfaces of each triangular pyramid A are α / 2, the inclination angles of the two cone surfaces of each triangular pyramid B are α / 2, and the inclination angle of one cone surface of each triangular pyramid B is β / 2; α=70.55 degrees, β=70.90 degrees; the array intercept of the microprismatic reflective film is 0.433 mm.

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