KR102338847B1 - Light reflection sheet capable increasing reflectivity for inclined incident light and method of manufacturing the same and mold for light reflection sheet manufacture and method of manufacturing the same - Google Patents

Abstract

Disclosed are light reflective paper capable of increasing the reflectance of inclined incident light and a manufacturing method thereof, and a mold for manufacturing the light reflective paper and a manufacturing method thereof. The disclosed mold for manufacturing light reflective paper comprises a body part having a pattern part on an upper surface thereof and a jig having a receiving part in which the body part is accommodated. The pattern part includes a plurality of patterns inclined in the same direction. The patterns are spaced apart from each other. Each of the patterns includes a plurality of first sub-patterns and a plurality of second sub-patterns. The disclosed light reflective paper includes a lower layer, a retroreflective layer, and an upper layer sequentially stacked. The retroreflective layer includes a pattern structured to exhibit a higher light reflectance for inclined incident light than for normally incident light.

Description

Light reflection sheet capable of increasing reflectivity with respect to incident light and a method for manufacturing the same, and a mold for manufacturing such a light reflecting paper, and a method for manufacturing the same sheet manufacture and method of manufacturing the same}

The present disclosure relates to a light-emitting paper or a light-reflecting band, and more particularly, to a light-reflecting paper capable of increasing the reflectance of incident light, a method for manufacturing the same, a mold for manufacturing the light-reflecting paper, and a method for manufacturing the same.

The light reflective paper refers to a sheet that reflects incident light. The light-reflecting paper may be expressed as a light-reflecting band. The light reflective paper may exhibit various colors depending on the material of the retroreflective region. Therefore, if the light reflective paper is used, the identification and visibility of the target to which the light reflective paper is attached may be increased. According to these characteristics of the light reflecting paper, the light reflecting paper can be applied to various fields, for example, it can be used in a transportation field such as a vehicle, a traffic field, a safety field, a security field, and can be applied to product design.

One embodiment provides a light reflective paper capable of increasing the light reflectance with respect to the incident light.

One embodiment provides a method of manufacturing such a light reflective paper.

One embodiment provides a mold for manufacturing a light reflective paper.

One embodiment provides a method of manufacturing such a mold.

The mold for manufacturing light reflective paper according to an exemplary embodiment includes a jig having a body portion having a pattern portion on an upper surface and a receiving portion in which the body portion is accommodated, and the pattern portion includes a plurality of patterns inclined in the same direction, The plurality of patterns are spaced apart from each other, and each of the plurality of patterns includes a plurality of first sub-patterns and a plurality of second sub-patterns. In one example, the plurality of patterns may be embossed or engraved patterns in the inclined direction. In one example, the pattern portion includes a plurality of first surfaces parallel and spaced apart from each other, and a plurality of second surfaces parallel and spaced apart from each other, and the second surface is located between the first surfaces, and the first and The second surface may have different inclination angles with respect to the same surface, and the plurality of patterns may be formed on at least one of the first and second surfaces. In one example, the first and second sub-patterns may be triangular pyramids. In another example, the first and second sub-patterns may be grooves in which a triangular pyramid can be accommodated.

A method of manufacturing a mold for manufacturing a light reflective paper according to an exemplary embodiment includes a process of forming a pattern on an upper surface of a plurality of unit mold material layers, a process of tilting the plurality of unit mold material layers at the same inclination angle, and the inclination angle of the plurality of unit mold material layers. and horizontally stacking and bonding the plurality of unit mold material layers while maintaining the same, and maintaining the same height of the pattern in the horizontally stacking and bonding process.

In an example, the method of manufacturing the mold may further include a process of forming a mold material layer covering the pattern on the resultant product that is horizontally stacked and combined, and a process of separating the mold material layer from the resultant product.

The light reflective paper according to an exemplary embodiment includes a lower layer, a retroreflective layer, and an upper layer sequentially stacked, and the retroreflective layer includes a pattern structured to show a higher light reflectance for incident light than for normally incident light. In an example, the structured pattern may include a plurality of first patterns inclined in a first direction with respect to a bottom surface of the retroreflective layer, and the plurality of first patterns may be spaced apart from each other in a horizontal direction. In another example, the structured pattern may include a plurality of second patterns disposed to be inclined in a second direction different from the first direction with respect to the bottom surface of the retroreflective layer and spaced apart from each other in a horizontal direction. In an example, the plurality of first patterns and the plurality of second patterns may be disposed in different regions.

The manufacturing method of the light reflective paper according to an exemplary embodiment is a method for manufacturing a light reflective paper including a retroreflective layer between a protective layer and an adhesive layer, wherein the retroreflective layer uses a mold for manufacturing the light reflective paper according to the exemplary embodiment to form

The disclosed mold for manufacturing light reflective paper includes a pattern formed in a direction inclined with respect to a bottom surface. The retroreflective layer formed with such a mold includes a structured light reflection pattern (eg, triangular pyramidal prism) formed in a direction inclined with respect to the bottom surface of the retroreflective layer. The disclosed light reflective paper includes such a retroreflective layer, and thus the reflectance for the incident light is much higher than that of the conventional light reflective paper. Therefore, when the disclosed light reflective paper is used, the light reflective paper can be recognized at a relatively greater distance than when using the conventional light reflective paper, and as a result, the long-distance visibility and discrimination of the object to which the light reflective paper is attached can be higher than before. Accident prevention and safety can be improved.

1 is a side view of a first mold (master mold) according to an exemplary embodiment.
2 and 3 are side views of a pattern for forming a plurality of light reflective elements included in the pattern portion of the first mold of FIG. 1 .
4 is a cross-sectional view illustrating a case in which the pattern of FIG. 2 is provided as an example of a pattern formed on the inclined surface of the first mold of FIG. 1 .
5 is a scanning electron microscope (SEM) photograph showing a side surface of the first mold of FIG. 1 .
6 is a front view of the pattern formed on the inclined surface of FIG. 4 , that is, the shape of the corresponding pattern as viewed from the same angle of inclination as the inclination angle of the pattern.
FIG. 7 is an SEM photograph of the pattern part of the first mold of FIG. 1 , and is taken at a first inclination angle at which the front of the pattern included in the pattern part is visible.
8 to 12 are SEM photos of the pattern part of the first mold of FIG. 1 , which were taken at an inclination angle different from the first inclination angle.
13 to 18 are cross-sectional views illustrating a method of manufacturing a first mold in stages according to an exemplary embodiment.
19 and 20 are cross-sectional views illustrating a process of manufacturing a second mold (main mold) directly used for manufacturing light reflective paper according to an exemplary embodiment using the first mold of FIG. 1 .
FIG. 21 is a plan view of FIG. 20 .
22 is a front view of a pattern for forming a light reflective element (eg, a prism) included in the second mold of FIG. 20 .
23 is a cross-sectional view taken along the 23-23' direction of FIG. 22;
24 and 25 are cross-sectional views illustrating a process of forming a retroreflective layer of light reflective paper using the second mold of FIG. 21 .
26 is a cross-sectional view illustrating a light reflective paper including the retroreflective layer of FIG. 25 and a method of manufacturing the same.
27 is a cross-sectional view showing a light reflective paper according to another embodiment.
28 is a cross-sectional view illustrating an example of the second retroreflective layer of FIG. 27 .

Hereinafter, a reflective paper capable of increasing the reflectance with respect to incident light and a manufacturing method thereof, a mold for manufacturing such a reflective paper, and a manufacturing method thereof according to an exemplary embodiment will be described in detail with reference to the accompanying drawings, each of the drawings The size of each component or the thickness of the layers or regions shown in FIG. 1 is illustrative for clarity and convenience of description and may be exaggerated. In addition, the embodiments described below are merely exemplary, and various modifications are possible from these embodiments. In addition, in the layer structure described below, expressions described as "upper" or "upper" may include not only those directly on top in direct contact but also those on other members in a non-contact manner.

First, a mold for manufacturing a light reflective paper and a manufacturing method thereof according to an exemplary embodiment will be described.

1 shows a first mold 100 according to an exemplary embodiment. The first mold 100 is a basic mold for manufacturing the second mold ( FIG. 8 ) used directly for manufacturing the light reflective paper, and may be expressed as a master mold.

Referring to FIG. 1 , the first mold 100 includes a jig 110 and a body 120 mounted on the jig 110 . The jig 110 may be a frame for fixing and supporting the body 120 . The jig 110 has a receiving portion 160 into which the body portion 120 is inserted. The receiving part 160 includes first and second side surfaces 110S1 and 110S2 and a bottom surface 110B. The first and second side surfaces 110S1 and 110S2 are spaced apart from each other and face each other. The bottom surface 110B is present between the first and second side surfaces 110S1 and 110S2. The lower ends of the first and second side surfaces 110S1 and 110S2 are connected through the bottom surface 110B. The bottom surface 110B is flat. The bottom surface 110B may be a plane parallel to the X-Z plane and perpendicular to the X-Y plane. The bottom surface 110B may be parallel to the outer bottom surface 110C of the jig 110 . The first and second side surfaces 110S1 and 110S2 may be parallel to each other, but may not be parallel to each other. The heights of the first and second side surfaces 110S1 and 110S2 may be the same or different from each other. The first and second side surfaces 110S1 and 110S2 may be inclined surfaces. The first and second side surfaces 110S1 and 110S2 may have the same inclination angle α1, but the inclination angle α1 may be different from each other. The inclination angle α1 may be an angle measured in a counterclockwise direction from the bottom surface 110B or the external bottom surface 110C. At least an upper surface of the body portion 120 of the upper surface and the lower surface is not flat. In an example, both the upper surface and the lower surface may not be flat. In another example, the upper surface may not be flat, and the lower surface may be a flat surface. The upper surface includes a pattern portion 100P. The pattern part 100P is spaced apart from the lower surface in a vertical direction (Y-axis direction). The pattern part 100P may include a plurality of first protrusions 120A pointed upward and a plurality of first patterns 130 for forming prisms. The plurality of first protrusions 120A are formed side by side in the X-axis direction. The plurality of first protrusions 120A are connected to each other. A first groove 120G1 is interposed between the plurality of first protrusions 120A. The plurality of first protrusions 120A may be parallel to each other. The heights of the plurality of first protrusions 120A may be equal to each other, and the depths of the first grooves 120G1 may be equal to each other. Here, the height means a height in the Y-axis direction, that is, a height measured in a direction perpendicular to the bottom surface 110B or the external bottom surface 110C. The size and/or shape of the plurality of first protrusions 120A may be the same, but may be different from each other. As an example, the side or cross-section of each of the plurality of first protrusions 120A may be a triangle as shown in the drawing, and the triangle may be a similar shape (eg, an equilateral triangle) having the same standard, but in another example The triangle may be a triangle having a different standard from that shown in the drawings. The other triangle may be an irregular triangle. For example, in an equilateral triangle, the length of at least one of two sides excluding the side belonging to the plane on which the pattern 130 is to be formed may be a different triangle from that of an equilateral triangle. The aligned overall shape of the plurality of first protrusions 120A may be a sawtooth shape. The plurality of first protrusions 120A include first and second surfaces S1 and S2, respectively. The first and second surfaces S1 and S2 are not parallel to each other, but are inclined at a given angle to each other. The plurality of first surfaces S1 are arranged parallel to each other in a line in a given direction, for example, the X-axis direction. The plurality of first surfaces S1 are spaced apart from each other in the X-axis direction, and the spaced distance may be the same, but may be different from each other. The plurality of second surfaces S2 are arranged parallel to each other in a line in a given direction, for example, the X-axis direction. The plurality of second surfaces S2 are spaced apart from each other in the X-axis direction, and the spaced distance may be the same, but may be different from each other. A second surface S2 is present between the plurality of first surfaces S1 . The first and second surfaces S1 and S2 are connected to each other. The first and second surfaces S1 and S2 may be inclined surfaces perpendicular to each other within a tolerance. In one example, the angle of the first surface S1 measured in a clockwise direction from the bottom surface 110B of the first mold 100 may be an acute angle. In other words, the first surface S1 may form an acute angle with respect to the negative X-axis. In one example, the angle of the second surface S2 measured in a counterclockwise direction from the bottom surface 110B may be an acute angle. In other words, the second surface S2 may form an acute angle with respect to the positive X-axis. In this example, the angle between the first and second surfaces S1 and S2 may be 90°. The areas of the first and second surfaces S1 and S2 may be the same or different from each other. The length SL1 in the direction perpendicular to the second surface S2 of the first surface S1 and the length SL2 in the direction perpendicular to the first surface S1 of the second surface S2 are equal to or each other can be different.

The pattern part 100P also includes a plurality of first patterns 130 respectively provided on the first surface S1 . Although the pattern part 100P is illustrated as including four first patterns 130 , this is an example for convenience of description and illustration, and the pattern part 100P includes four or more first patterns 130 . can do. The plurality of first patterns 130 may be aligned side by side in the X-axis direction and may be spaced apart from each other. The plurality of first patterns 130 may be parallel to each other. The plurality of first patterns 130 may form a pattern array.

The entire surface of the plurality of first patterns 130 directly facing the first surface S1 may be in direct contact with the first surface S1 . The plurality of first patterns 130 are respectively present on the inclined first surface S1 , and the first pattern 130 is also inclined as much as the first surface S1 is inclined, and the first pattern 130 . The direction of may be perpendicular to the first surface S1. In one example, the first pattern 130 may form an acute angle α1 with respect to the bottom surface 110C of the first mold 100 or with respect to the positive X-axis. In one example, the acute angle α1 may be about 45°. In another example, the acute angle α1 may be less than or greater than 45° within the allowable range as long as the light reflectance of the finally formed light reflective paper does not deviate from the allowable standard. The longitudinal direction of the finally formed light reflective paper may be parallel to the X-axis.

The lower surface of the body portion 120 includes a plurality of second projections (120B) pointed downward. All of the downwardly pointed portions 10P of the plurality of second protrusions 120B are in contact with the bottom surface 110B. The plurality of second protrusions 120B are vertically spaced apart from the pattern portion 100P. The plurality of first protrusions 120A and the plurality of second protrusions 120B may be regarded as being parallel to each other when viewed as a whole. The protrusion degree, for example, the downward height of the plurality of second protrusions 120B, may be equal to each other based on the same reference. Since the plurality of second protrusions 120B exist, a second groove 120G2 exists between the second protrusions 120B. The second groove 120G2 is an upwardly concave portion between the second protrusions 120B. The heights of the vertices of the second grooves 120G measured from the bottom surface 110B may all be the same within the tolerance range. In the vertical direction, the second protrusion 120B corresponds to the first groove 120A, and the second groove 120G2 corresponds to the first protrusion 120A. In one example, the first protrusion 120A and the second protrusion 120B may have a vertical symmetric relationship. The second protrusion 120B may include third and fourth surfaces 10S1 and 10S2. The plurality of third surfaces 10S1 are parallel to and aligned with each other in a given direction, for example, in the X-axis direction. The third surfaces 10S1 are spaced apart from each other. The plurality of third surfaces 10S1 and the first surface S1 may be parallel to each other and may face each other. The plurality of fourth surfaces 10S2 are parallel to and aligned with each other in a given direction, for example, in the X-axis direction. The fourth surfaces 10S2 are spaced apart from each other. The plurality of fourth surfaces 10S2 and S2 may be parallel to each other and may face each other. A fourth surface 10S2 is disposed between the plurality of third surfaces 10S1, respectively. The third and fourth surfaces 10S1 and 10S2 may be connected to each other and form a surface of the second protrusion 120B. The third and fourth surfaces 10S1 and 10S2 may be inclined at a given angle to each other. For example, the angle between the third and fourth surfaces 10S1 and 10S2 may be about 90°.

Meanwhile, for convenience of explanation, the plurality of first patterns 130 and the plurality of first protrusions 120A are divided in the drawings, and the description is also divided, but the plurality of first patterns 130 and the plurality of first protrusions are divided. 120A is a single unit without physical boundaries, and may be the same material as each other.

The configuration of the first pattern 130 seen through the side surface of the first pattern 130 may be different depending on the arrangement form or arrangement method of the sub-patterns included in the first pattern 130 .

FIG. 2 shows the configuration of the first pattern 130 seen through the side surface of the first pattern 130 when the sub-patterns included in the first pattern 130 are aligned in the first alignment form.

Referring to FIG. 2 , the first pattern 130 includes a first sub-pattern 130A and a second sub-pattern 130B. The first sub-pattern 130A is present between the second sub-patterns 130B. The heights of the first and second sub-patterns 130A and 130B may be equal to each other.

3 shows the configuration of the first pattern 130 seen through the side surface of the first pattern 130 when the sub-patterns included in the first pattern 130 are aligned in the second alignment form.

Referring to FIG. 3 , the first pattern 130 includes a first sub-pattern 130A and a second sub-pattern 130B. The second sub-pattern 130B is present between the first sub-patterns 130A. The heights of the first and second sub-patterns 130A and 130B may be equal to each other.

FIG. 4 shows a case in which the first pattern 130 having a side configuration as shown in FIG. 2 is formed on the first surface S1 of the first protrusion 120A. The first pattern 130 may have a side configuration as shown in FIG. 3 .

5 shows a scanning electron microscope (SEM) photograph of the side surface of the first mold 100 according to an exemplary embodiment. The first mold 100 of the scanning electron microscope picture of FIG. 5 is made of a UV-curable polymer material.

Referring to FIG. 5 , the first pattern 130 is present on the left inclined surface of the triangular first protrusion 120A. Accordingly, the first pattern 130 faces to the left by the inclination angle of the inclined surface. It can be seen that the first pattern 130 includes a first sub-pattern 130A and a second sub-pattern 130B, and the arrangement of the first and second sub-patterns 130A is the same as described in FIG. 2 or FIG. 3 . can

6 shows the first pattern 130 formed on the inclined first surface S1 of the first protrusion 120A as viewed from the second inclination angle α2 on the X-Y plane. Here, the second inclination angle α2 may be a normal perpendicular to the bottom surface 110B downward, that is, an angle measured in a counterclockwise direction from a negative Y-axis. When the second inclination angle α2 is the same as the inclination angle of the first surface S1, FIG. 6 shows the first pattern 130 viewed from the direction parallel to the normal 4VL perpendicular to the first surface S1. As a shape, it may be a front view of the first pattern 130 . The second inclination angle α2 may be, for example, about 45°, and the tolerance may be ±5° or less.

Referring to FIG. 6 , the first pattern 130 is formed in the Z-axis direction. The first pattern 130 includes a plurality of unit patterns UP1 arranged side by side in the Z-axis direction. The unit pattern UP1 may have a regular hexagonal planar shape. The unit pattern UP1 includes three first sub-patterns 130A and three second sub-patterns 130B. In the unit pattern UP1 , the three first sub-patterns 130A form a triangle, and the three second sub-patterns 130B also form a triangle. The first sub-pattern 130A is positioned between the second sub-patterns 130B. In the unit pattern UP1 , the first sub-pattern 130A and the second sub-pattern 130B may be disposed to form a rotational symmetry of 60°.

7 is an SEM photograph of the pattern portion 100P taken at a position where the second inclination angle α2 is 45°. The SEM photograph of FIG. 7 may be the same as the result of repeating the first pattern 130 of FIG. 6 left and right, that is, in the +X-axis direction and the -X-axis direction.

Referring to FIG. 7 , the plurality of first patterns 130 aligned in the X-axis direction appear to be in contact with each other. As shown in FIG. 1 , although the plurality of first patterns 130 are spaced apart from each other in the X-axis direction, in FIG. 7 , the first pattern 130 appears to be in contact with each other. This is because the pattern portion 100P is viewed at the same inclination angle as the inclination angle of the formed first surface S1. Accordingly, when the second inclination angle α2 is viewed from an angle different from 45°, it can be seen that the plurality of first patterns 130 are spaced apart from each other. In addition, when the second inclination angle α2 is viewed from an angle different from 45°, the shape of the unit pattern UP1 is also different from that of FIG. 7 . For example, the unit pattern UP1 is rotated around the Z axis. It seems like Since the first pattern 130 is formed of a plurality of unit patterns UP1, when the pattern portion 100P is viewed from an angle where the second inclination angle α2 is different from 45°, the first pattern 130 is centered on the Z-axis. appears to be rotated to 8 to 12 are SEM photos showing an example of this.

8 is an in-situ SEM photograph of the pattern part 100P taken at a position where the second inclination angle α2 is 5°, and FIG. 9 is a position where the second inclination angle α2 becomes 10°, FIG. 10 is taken at a position where the second inclination angle α2 is 15°, FIG. 11 is taken at a position where the second inclination angle α2 is 25°, and FIG. 12 is taken at a position where the second inclination angle α2 is 35°. This is an SEM picture.

8 to 12 , as the inclination angle looking at the pattern part 100P, that is, the second inclination angle α2 increases (5° -> 35°), the separation distance between the first patterns 130 becomes narrower. and the first pattern 130 appears to rotate about the Z-axis. Next, a method of manufacturing the first mold 100 will be described with reference to FIGS. 13 to 18 .

First, as shown in FIG. 13 , the plurality of unit molds 300 are aligned and adhered to each other in the lateral direction, for example, in a direction parallel to the X-axis, so that they are combined as a single unit. Accordingly, all of the side surfaces of the plurality of unit molds 300 may be in direct contact with each other. This combination can be used as one substrate on which a pattern is to be formed. At least one first pattern 300 may be formed on one unit mold 300 . Materials of the plurality of unit molds 300 may be the same. In one example, the unit mold 300 may be a nickel mold, a mold containing nickel, or a UV curing resin mold. The sizes and specifications (thickness, width 4W1, height 4T1, etc.) of the plurality of unit molds 300 may be the same, but may be partially different in other examples. The unit mold 300 may be a lamina layer. The side surface 4S1 of the unit mold 300 may be parallel to a plane (Y-Z plane) formed of the Y-axis and the Z-axis, and the upper surface 4S2 may be parallel to the X-Z plane. The area of the upper surface 4S2 of each unit mold 300 may be the same as each other.

Next, the first pattern 130 is formed on the upper surface 4S2 made by combining the plurality of unit molds 300 , and the process according to an exemplary embodiment is as follows.

First, as shown in FIG. 14 , a first V-shaped groove is formed on the upper surface 4S2 in the first direction 14D1 by using the pattern forming apparatus or the cutting apparatus 320 . . In one example, the pattern forming device or the cutting device 320 may be a V-grooving device, a diamond turning machine, or a diamond bite device. An angle between the inner surfaces of the V-shaped first groove may be about 60°. Then, a second V-shaped groove is formed in the upper surface 4S2 in the second direction 14D2 using the cutting means 320 . An angle between the inner surfaces of the second grooves may be about 60°. Next, a third groove is formed in the upper surface 4S2 in the third direction 14D3 using the cutting means 320 . An angle between the inner surfaces of the third groove may be about 60°. An angle between the first to third directions 14D1-14D3 may be about 60°. When the tolerance of the included angle is ±5° or less, for example, even when it is ±3° or less, the included angle may be regarded as 60°. In one example, when the upper surface 4S2 is in the X-Z plane, the first direction 14D1 may be a negative X-axis direction or a positive X-axis direction. The second direction 14D2 may be a direction rotated by 60° clockwise or counterclockwise with respect to the first direction 14D1 . The third direction 14D3 may be a direction rotated by 60° clockwise or counterclockwise with respect to the second direction 14D2 .

As the first to third grooves are formed in the first to third directions 14D1 to 14D3 , the first sub-pattern 130A having a triangular pyramid shape is formed on the upper surface 4S2 . While moving the cutting means 320 at regular intervals along the Z-axis, grooves parallel to the first groove are formed on the upper surface 4S2. In addition, after forming the second groove, the cutting means 320 is moved along the X-axis at regular intervals to form grooves parallel to the second groove on the upper surface 4S2. Further, after forming the third groove, the cutting means 320 is moved along the X-axis at regular intervals to form grooves parallel to the third groove on the upper surface 4S2. A plurality of first and second sub-patterns 130A and 130B constituting an array are formed on the upper surface 4S2 through this patterning process. As a result of the patterning process, as shown in FIG. 15 , a first pattern 130 is formed on the upper end of each unit mold 300 . The first pattern 130 includes a plurality of first and second sub-patterns 130A and 130B arranged as described above.

After the patterning process, the combined plurality of unit molds 300 are separated individually.

Next, as shown in FIG. 16 , each unit mold 300 is brought into close contact laterally, that is, in the X-axis direction, while maintaining the same acute angle α3 with respect to the X-axis or the Y-axis. In this case, the upper and lower ends of the plurality of unit molds 300 inclined at the same acute angle α3 may be maintained at the same height. Since the plurality of unit molds 300 are inclined at an acute angle α3, the first pattern 130 is inclined at an acute angle α3 with respect to the positive X-axis while maintaining the same height. In one example, the acute angle α3 may be about 45°. The plurality of unit molds 300 in close contact may correspond to the body portion 120 of the first mold 100 of FIG. 1 .

After the first pattern 130 is formed on the upper end of the unit mold 300 , the unit mold 300 is divided into the first pattern 130 and the remaining part, that is, the body 300A, for convenience, and the first pattern 130 . is considered to be formed on the upper surface S1 of the body 300A. Next, the plurality of unit molds 300 in close contact with each other are accommodated in the receiving part 160 of the jig 110 shown in FIG. 17. do. Reference numeral 16H denotes a through hole formed horizontally in the jig 110 . The through-holes 16H are located on both sides of the accommodating part 160 , and are connected to the accommodating part 160 . The through-hole 16H may be a movement path of a means for fixing the plurality of unit molds 300 accommodated in the accommodating part 160 .

FIG. 18 shows a result of accommodating a plurality of unit molds 300 in close contact with the accommodating part 160 of the jig 110 . Referring to FIG. 18 , the sharp lower ends 10P of the body 300A of the plurality of unit molds 300 are all at the same height. Accordingly, all of the lower ends 10P of the body 300A of the plurality of unit molds 300 are in contact with the bottom surface 110B of the receiving part 160 of the jig 110 . The plurality of unit molds 300 are accommodated in the accommodating part 160 and fixed to the jig 110 , thereby completing the first mold 100 .

The plurality of unit molds 300 may be fixed to the jig 110 in various ways, and a member for fixing the plurality of unit molds 300 may be provided in the jig 110 .

For example, the jig 110 includes a penetrating member 170 and a penetrating member penetrating the first and second portions 110L and 110R on both sides of the receiving portion 160 of the jig 110 through the through hole 16H. (170) It may further include first and second fastening members 170A and 170B provided at both ends and fastened to the penetrating member 170 . The penetrating member 170 may also penetrate the plurality of unit molds 300 mounted on the receiving part 160 . The first and second fastening members 170A and 170B press the first and second portions 110L and 110R of both sides of the receiving portion 160 along the penetrating member 170 . This pressure is transmitted to the plurality of unit molds 300 , and as a result, the plurality of unit molds 300 may be firmly fixed between the first and second parts 110L and 110R. In order to transmit the pressure applied to the first and second portions 110L and 110R on both sides of the receiving portion 160 by the first and second fastening members 170A and 170B to the plurality of unit molds 300 , the first and the second parts 110L and 110R may be moved toward the plurality of unit molds 300 along the penetrating member 170 . The first and second portions 110L and 110B may be moved while being connected to a guide element (not shown). The bottom surface 110B of the accommodating part 160 may extend below the first and second parts 110L and 110R. The guide member may be provided on a surface extending below the first and second portions 110L and 110R of the bottom surface 110B. The penetrating member 170 may be a rod having rigidity that is not bent by the degree of force applied to the plurality of unit molds 300 during pattern transfer or pattern printing. In one example, the penetrating member 170 may be a metal rod. When threads are formed as an example of a fastening means at both ends of the penetrating member 170, the first and second fastening members 170A and 170B may be nuts that can be fastened by matching the threads. In another example, the selected one (eg, 170A) of the first and second fastening members 170A and 170B and the penetrating member 170 may be a single body such as a bolt, and the first and second fastening members 170A and 170B ), one (eg, 170B) not selected may be a nut.

In subsequent drawings, for convenience, illustration of the through hole 16H, the through member 170, and the first and second fastening members 170A and 170B will be omitted.

On the other hand, after forming the first pattern 130 on the upper surface 4S2 of the plurality of unit molds 300 combined as described with reference to FIGS. 13 to 15 , the plurality of unit molds 300 are individually separated. Next, as shown in FIG. 16 , when the plurality of unit molds 300 are horizontally stacked in an inclined state, the second surface S2 of the unit mold 300 exposed is similar to the first pattern 130 . Alternatively, the same pattern may be formed. By doing this, the first and second surfaces S1 and S2 of the body 300A of the unit mold 300, that is, the first and second surfaces S1 and S2 of the body 120 of FIG. One pattern 130 may be formed. Accordingly, an array of reflective prisms (eg, triangular pyramidal prisms) inclined in different directions may be formed on the retroreflective layer of the finally formed light reflective paper.

Next, a method of forming the second mold from the first mold 100 that is the master mold will be described with reference to FIGS. 19 to 23 . The second mold may be a main mold directly used for manufacturing the retroreflective layer of the light reflective paper according to an embodiment. Therefore, the second mold may be a mold directly used to manufacture the optical half-piece according to an embodiment. The second mold may be a mold in which the pattern portion 100P of the first mold 100 is transferred or copied in an engraved form.

Referring to FIG. 19 , the mold material layer 140 covering the upper surface of the first mold 100 , for example, at least the entire pattern part 100P is formed. The mold material layer 140 may cover the entire upper surface of the first mold 100 . All of the first pattern 130 and the second surface S2 of the first mold 100 are covered with the mold material layer 140 . The mold material layer 140 may be in contact with the first pattern 130 and its peripheral surface. Accordingly, the surface shape of the upper surface of the first mold 100 may be transferred to the mold material layer 140 . In other words, at least the pattern portion 100P of the first mold 100 may be printed on the mold material layer 140 . In the transfer, the embossed pattern on the upper surface of the first mold 100 may be transferred to the mold material layer 140 as an engraved pattern, and the engraved pattern may be transferred to the mold material layer 140 as an embossed pattern. The mold material layer 140 is later used as a main mold used to form the retroreflective layer, and the mold material layer 140 may be formed of a material having a suitable thickness and durability. For example, the mold material layer 140 may be a metallic nickel layer or an ultraviolet (UV) curable polymer layer, but is not limited thereto.

Next, the mold material layer 140 is separated from the first mold 100 . For example, the separation of the mold material layer 140 from the first mold 100 may be performed using a conventional separation method used in the field of manufacturing light reflective paper. 20 shows the mold material layer 140 separated from the first mold 100 . Hereinafter, the mold material layer 140 is referred to as a second mold. Since the upper surface of the second mold 140 is a portion to which the surface shape of the upper surface of the first mold 100 is transferred, it is not flat as shown in FIG. 20 , and there is a convex or bumpy pattern. The patterns formed on the upper surface of the second mold 140 may be repeated with regularity. A plurality of grooves 130G are present on the upper surface of the second mold 140 . The plurality of grooves 130G are horizontally spaced apart from each other (in the X-axis direction). The plurality of grooves 130G may be parallel to each other. The plurality of grooves 130G is a portion in which the first pattern 130 of the first mold 100 is transferred in an engraved form. For convenience of description, the second mold 140 is also divided into a body portion 140A and a pattern portion 140B, like the first mold 100 . The pattern portion 140B may be an upper layer of the second mold 140 including the plurality of grooves 130G and the plurality of protrusions 150 . The body portion 140A may be a portion other than the pattern portion 140B in the second mold 140 . Since the plurality of grooves 130G is a transfer of the first pattern 130 of the first mold 100, an acute angle α4 may be formed in the clockwise direction with respect to the bottom surface of the second mold 140 or the X-Z plane. In other words, the plurality of grooves 130G may form an acute angle α4 with the negative X-axis. In one example, the acute angle α4 may be about 45°. When the second mold 140 is rotated 180° about the Y-axis, the plurality of grooves 130G may form an acute angle with the positive X-axis. Looking at the plurality of grooves 130G from the position inclined at the acute angle α4, the plurality of grooves 130 are sharp toward the body portion 140A. A protrusion 150 is present between the plurality of grooves 130G. 19 , in the process of transferring the upper surface of the first mold 100 to the mold material layer 140 , between the second surface S2 of the first mold 100 and the first pattern 130 is It is filled with the mold material layer 140 . This filled portion becomes the protrusion 150 of the pattern portion 140B of the second mold 140 . The protrusion 150 may be a boundary between the plurality of grooves 130G. One surface of the protrusion 150 may be one surface of the groove 130G. That is, the protrusion 150 and the groove 130G may share one surface. The upper end of the protrusion 150 may be sharp, or the upper end of the groove 130G. The plurality of protrusions 150 may have the same shape as each other. The other surface 150S, which is not shared with the groove 130G of the protrusion 150, is connected to the adjacent groove 130G.

21 is a plan view of the second mold 140 of FIG. 20 viewed from above.

Referring to FIG. 21 , in the pattern portion 140B of the second mold 140 , the plurality of projections 150 and the plurality of grooves 130G are repeatedly formed in the longitudinal direction of the light reflective paper, that is, in a direction parallel to the X-axis. It can be seen that they are arranged alternately. The lengths of the protrusion 150 and the groove 130G in the Z-axis direction may be the same.

22 is a plan view of the groove 130G of FIGS. 20 and 21 viewed from the front of the groove 130G, that is, a front view of the groove 130G viewed from a position inclined at an acute angle α4.

Referring to FIG. 22 , one groove 130G includes a plurality of unit grooves UG1 aligned in the Z-axis direction (direction perpendicular to the longitudinal direction of the light reflective paper). The unit groove UG1 includes three first sub grooves G1 and three second sub grooves G2 . The first sub-groove G1 may be an example of a first sub-pattern, and the second sub-groove G2 may be an example of a second sub-pattern. In one example, the planar shape of the unit groove UG1 may be a regular hexagon. In the unit groove UG1, the three first sub grooves G1 are arranged in a triangle. The three second sub grooves G2 are also arranged in a triangle. In the unit groove UG1, the first and second sub grooves G1 and G2 are arranged to be rotationally symmetrical. In one example, the first and second sub-grooves G1 and G2 may have rotational symmetry of 60°. That is, when the first sub-groove G1 is rotated clockwise or counterclockwise by 60° with the center of the unit groove UG1 as the rotation axis, it becomes the second sub-groove G2. In the opposite case, the second sub-groove G2 becomes the first sub-groove G1. The three first sub grooves G1 have rotational symmetry of 120°. The three second sub grooves G2 also have a rotational symmetry of 120°. The size, shape, and standard of the first sub-groove G1 may be the same as that of the second sub-groove G2. The boundaries of the adjacent first and second sub-grooves G1 and G2 are shared with each other and become upper ends of each other. Each of the first and second sub grooves G1 and G2 may be an engraved triangular pyramid. In other words, the first and second sub-grooves G1 and G2 may have a shape capable of accommodating a triangular pyramid. For example, a triangular pyramid having the same shape as the first sub-pattern 130A may be accommodated in the first sub-groove G1, and a triangular pyramid having the same shape as the second sub-pattern 130B may be accommodated in the second sub-groove G2. can be accepted. A dotted line in each sub-groove G1, G2 is inserted for convenience to represent that each sub-groove G1, G2 is a concave groove.

23 shows a cross-section of FIG. 22 taken in the 23-23' direction.

Referring to FIG. 23 , first and second sub grooves G1 and G2 are present on the upper surface of the second mold 140 , and upper ends of adjacent first and second sub grooves G1 and G2 are aligned with each other. touched and shared with each other. The depths of the first and second sub-grooves G1 and G2 may be equal to each other.

Next, a method of manufacturing the light reflective paper using the above-described second mold 140 will be described with reference to FIGS. 24 to 26 .

First, as shown in FIG. 24 , the retroreflective material layer 1000 is applied to a given thickness on the second mold 140 . The thickness of the retroreflective material layer 1000 may be determined in consideration of the total thickness of the light reflective paper and the light reflection characteristics of the retroreflective material layer 1000 . The retroreflective material layer 1000 may be applied so that the upper surface thereof is flat. In one example, the retroreflective material layer 1000 is a transparent material, and includes a polycarbonate-based material layer, a polymethyl methacrylate-based material layer, a polyethylene terephthalate-based material layer, a polyvinyl chloride-based material layer, a polyurethane-based material layer, It may include, but is not limited to, an ethylene vinyl acetate copolymer-based material layer or a polyolefin-based material layer. The retroreflective material layer 1000 may be applied to completely fill the groove 130G of the upper surface of the second mold 140 and completely cover the protrusion 150 . After the retroreflective material layer 1000 thus applied is hardened, the retroreflective material layer 1000 is separated from the second mold 140 . In one example, the separation of the retroreflective material layer 1000 may be performed by applying a method used in a conventional method of manufacturing a light reflective paper. In this way, a retroreflective layer in which the surface shape or surface structure of the upper surface of the second mold 140 is transferred to one surface is formed. In other words, the surface shape of the upper surface of the second mold 140 is printed on one surface of the retroreflective material layer 1000 . Hereinafter, the retroreflective material layer 1000 separated from the second mold 140 will be described as a retroreflective layer.

Meanwhile, the second mold 140 may be formed to a length corresponding to the desired length of the light reflective paper by using a method such as repeated transfer, and then the process of obtaining the retroreflective layer may be performed.

25 shows the retroreflective layer 1000 separated from the second mold 140 .

Referring to FIG. 25 , the retroreflective layer 1000 is a single body and a single layer, but is divided into a body part 1010 and a pattern part 1020 for convenience of description. The pattern part 1020 corresponds to the upper surface of the retroreflective layer 1000 and faces the surface of the object to which the light reflective paper is attached. The pattern unit 1020 includes a plurality of second patterns 250 provided to be inclined. The second pattern 250 may be disposed to form a first acute angle α5 with respect to the bottom surface of the retroreflective layer 1000 in a clockwise direction. In other words, the second pattern 250 may be positioned between the positive Y-axis and the positive X-axis, and may form a first acute angle α5 with the positive X-axis. In one example, the first acute angle α5 may be about 45°. Since the pattern portion 1020 of the retroreflective layer 1000 is a transfer of the upper surface of the second mold 140, and the upper surface of the second mold 140 is a transfer of the upper surface of the first mold 100, As a result, the configuration and shape of the pattern portion 1020 of the retroreflective layer 1000 may be the same as that of the pattern portion 100P of the first mold 100 . Accordingly, the shape of the second pattern 250 of the pattern portion 1020 of the retroreflective layer 1000 may be the same as that of the first pattern 130 illustrated in FIG. 6 . That is, the second pattern 250 of the pattern portion 1020 of the retroreflective layer 1000 may include a plurality of triangular pyramids corresponding to the first and second sub-patterns 130A and 130B of FIG. 6 . Since the retroreflective layer 1000 is a material that is transparent to light, as a result, the plurality of second patterns 250 included in the pattern portion 1020 of the retroreflective layer 1000 may be a prism array that is inclined and arranged regularly. A material constituting the pattern portion 1020 of the retroreflective layer 1000 is different from the pattern portion 100P of the first mold 100 . The refractive index of the retroreflective layer 1000 with respect to the incident light is greater than that of air. In the light reflective paper, the pattern portion 1020 of the retroreflective layer 1000 may be in contact with the air layer, and the triangular pyramidal prism included in the second pattern 250 of the pattern portion 1020 may be formed to satisfy the total reflection condition. Accordingly, the light 23L that is directly incident on the second pattern 250 of the pattern portion 1020, that is, the light 23L that is incident on the bottom surface of the retroreflective layer 1000 at a second acute angle α6, is the second pattern. It is totally reflected at 250 and may be reflected in a direction opposite to the incident direction. As a result, light reflected from the retroreflective layer 1000 in a direction inclined at the second acute angle α6 with respect to the retroreflective layer 1000 can be seen. Since the reflected light is a reflection of the light directly incident on the second pattern 250 , that is, the light incident on the triangular pyramid prism in the front, even in the direction inclined at the second acute angle α6 with respect to the retroreflective layer 1000 . It is possible to receive light of relatively strong intensity. In other words, the pattern portion 1020 of the retroreflective layer 1000 includes a pattern 250 structured to relatively strongly reflect light (oblique incident light) that is obliquely incident to the retroreflective layer 1000 . Even in a direction inclined with respect to (1000), the presence of the retroreflective layer 1000 can be clearly recognized. Since the retroreflective layer 1000 can be viewed as a light reflecting paper, the visibility of the light reflecting paper may be increased even in a direction inclined at the second acute angle α6 with respect to the light reflecting paper, which increases the visibility of the object to which the light reflecting paper is attached. becomes the result.

The incident light 23L is incident on the retroreflective layer 1000 from a material layer (eg, an air layer) having a lower refractive index than that of the retroreflective layer 1000 . Accordingly, in order for the incident light 23L to be incident on the second pattern 250 at the first acute angle α5 , the second acute angle α6 may be smaller than the first acute angle α5 . For example, the second acute angle α6 may be greater than 0° and less than 45°.

26 shows a light reflective paper 1200 according to an exemplary embodiment.

Referring to FIG. 26 , the light reflective paper 1200 may include a lower layer 26L, a retroreflective layer 1000 and an upper layer 26U sequentially stacked. The lower layer 26L may include a first material layer 1230 and a second material layer 1240 that are sequentially stacked. The upper layer 26U may include an air layer 1250 , a sealing layer 1260 , and an adhesive layer 1270 that are sequentially provided. The outer surface of the adhesive layer 1270 may be covered with a release film (not shown). The first material layer 1230 may be, for example, a water-repellent coating layer or may include a water-repellent coating layer. The second material layer 1240 may be or include a protective layer for protecting the retroreflective layer 1000 from external contamination. When the second material layer 1240 serves as a water-repellent coating, the first material layer 1230 may be omitted. In one example, the second material layer 1240 is a material transparent to light, and may include a polymethyl methacrylate-based material layer, an acrylonitrile-styrene-acrylate-based material layer, or a polyurethane-based material layer, It is not limited to these. Various types of patterns may be printed on the surface of the second material layer 1240 , and these patterns may be printed on the interface between the second material layer 1240 and the retroreflective layer 1000 , and It can also be printed on one side. As described with reference to FIG. 25 , the retroreflective layer 1000 may include a body portion 1010 and a pattern portion 1020 . In FIG. 26 , the pattern portion 1020 is simply shown as one layer for convenience. The sealing layer 1260 may serve to seal the second pattern 250 of the pattern portion 1020 of the retroreflective layer 1000 , for example, an inclined triangular pyramidal prism array. The sealing layer 1260 includes protrusions 1260P protruding toward the retroreflective layer 1000 and in contact with the retroreflective layer 1000 . The protrusions 1260P may contact a portion of the pattern portion 1020 where the second pattern 250 is not formed. The protrusions 1260P are spaced apart from each other. An air layer 1250 may exist between the sealing layer 1260 and the pattern portion 1020 of the retroreflective layer 1000 due to the protrusions 1260P. The air layer 1250 may be filled with a material having a refractive index smaller than that of the pattern unit 1020 . The sealing layer 1260 may include a polyester-based material layer, a polyurethane-based material layer, an ethylene vinyl acetate-based material layer, a polyamide-based material layer, a polyolefin-based material layer, or a styrene block copolymer-based material layer, but is limited thereto. doesn't happen The adhesive layer 1270 is a layer in direct contact with the object when the light reflective paper 1200 is attached to the object. The adhesive layer 1270 may include an adhesive or an adhesive for attaching the reflective paper 1200 to the object. In one example, the adhesive layer 1270 may include an acrylic material layer, a silicone material layer, or a rubber-based material layer, but is not limited thereto.

In another example, while maintaining the thickness T1 of the light reflective paper 1200 or increasing the thickness T1 , other layers other than the above-described material layer may be further included above or below the retroreflective layer 1000 .

When the light 26L1 is incident from a direction inclined at a third acute angle α7 with respect to a direction parallel to the length L1 of the light reflective paper 1200, light along with the characteristics of the retroreflective layer 1000 described in FIG. Due to the refraction of the incident light 26L1 due to the difference in refractive index between the reflective paper 1200 and the air layer, light having a relatively strong intensity may be emitted in a direction opposite to the incident direction (26L2). Accordingly, visibility of the light reflecting paper 1200 may be increased even in a direction inclined at the third acute angle α7 with respect to the longitudinal direction of the light reflecting paper 1200 . Therefore, in the case of an object to which such a light reflective paper 1200 is attached, for example, when such a light reflective paper 1200 is attached to a guardrail of a road, at a relatively greater distance than when the conventional light reflective paper is attached to the guardrail. The existence of the guard rail can be recognized. As such, it is possible to recognize the existence of an object at a relatively greater distance than in the conventional case, and thus, safety accidents can be reduced compared to when the conventional light reflective paper is used. In one example, the third acute angle α7 may be greater than 0° and less than 45°, but is not limited thereto.

27 shows a second light reflective paper according to another exemplary embodiment. Only parts different from the light reflective paper described with reference to FIG. 26 will be described, and the same reference numerals as those of the reference numerals described with reference to FIG. 26 indicate the same members, and a description thereof will be omitted.

Referring to FIG. 27 , the second light reflective paper 2700 includes a lower layer 26L, a retroreflective layer 2710 and an upper layer 26U. The retroreflective layer 2710 may include a plurality of first retroreflective layers 270A and a plurality of second retroreflective layers 270B. The first retroreflective layer 270A may be the retroreflective layer 1000 described with reference to FIGS. 25 and 26 . The second retroreflective layer 270B may be the same as that in which the direction of the second pattern 250 in the pattern portion 1020 of the retroreflective layer 1000 described with reference to FIG. 25 is formed in the opposite direction. The second retroreflective layer 270B reflects the light 27L1 incident at an acute angle α8 given from the left side of the second light reflecting paper 2700 in a direction diametrically opposite to the incident direction. Accordingly, it is possible to observe the relatively strongly emitted light 27L2 even in a direction inclined at a given acute angle α8.

As a result, the first retroreflective layer 270A provides relatively high visibility to an observer at an acute angle to the second light reflecting paper 2700 on the right side of the second light reflecting paper 2700, and the second retroreflective layer ( 270B) may provide relatively high visibility to the observer on the left.

28 shows an exemplary embodiment of the second retroreflective layer 270B.

Referring to FIG. 28 , the second retroreflective layer 270B includes a body portion 1010 and a pattern portion 1080 . The second retroreflective layer 270B is a single body and is a single layer, but is divided as described above for convenience of description. The pattern unit 1080 includes a plurality of third patterns 250A. The plurality of third patterns 250A are aligned in a direction parallel to the X-axis and spaced apart from each other. The heights of the plurality of third patterns 250A may be the same. The third pattern 250A is inclined at a fourth acute angle α9 counterclockwise with respect to the bottom surface (X-Z plane) of the second retroreflective layer 270B. The fourth acute angle α9 may be about 45°.

As such, the third pattern 250A is slanted to the right opposite to the second pattern 250 of FIG. 25, and the second retroreflective layer 270B has an acute angle ( The light 27L1 obliquely incident to α8) can be relatively strongly reflected in the direction opposite to the incident direction. Accordingly, the second retroreflective layer 270B may provide higher visibility than before to an observer on the left side of the second light reflection paper 2700, for example, an observer inclined at a given acute angle α8 with the second light reflection paper 2700. . As an example, the given acute angle α8 may be smaller than the fourth acute angle α9. For example, the given acute angle α8 may be greater than 0° and less than 45°, but is not limited thereto.

Although many matters have been specifically described in the above description, they should be construed as examples of preferred embodiments rather than limiting the scope of the invention. Therefore, the scope of the present invention should not be defined by the described embodiments, but should be determined by the technical idea described in the claims.

4S1: side 4S2: top side
4T1: Height in the Y-axis direction of the unit mold 4VL: Normal to the first surface (S1)
4W1: Width in the X-axis direction of the unit mold
10P: the second protrusion (120B) pointed toward the bottom surface
10S1, 10S2: third and fourth surfaces 14D1-14D3: first to third directions
16L: Through hole
23L: Light incident obliquely to the second pattern 250
26L: lower layer 26L1, 27L1: light incident on the retroreflective layer
26L2, 27L2: Light reflected from the retroreflective layer
26U: upper layer 100: first mold (master mold)
120, 140A: body part 100P, 140B: pattern part
110: jig 110B: receiving part bottom surface
110C: the bottom of the jig 110L: the left part of the receiving part of the jig
110R: the right side of the receiving part of the jig 110S1, 110S2: the first and second sides
120A, 120B: first and second protrusions 120G1, 120G2: first and second grooves
130,250,250A: first to third patterns 130A, 130B: first and second sub-patterns
130G: groove 140: mold material layer (second mold)
150: projection 150S: the other side of the projection
160: receiving unit 170: penetrating member
170A, 170B: first and second fastening members 130A, 130B: first and second sub-patterns
270A, 270B: first and second retroreflective layers
300: unit mold 300A: body
320: cutting device 1000: retroreflective material (retroreflective layer)
1010: body part 1020, 1080: pattern part
1200: light reflective paper 1230, 1240: first and second material layers
1250: air layer 1260: sealing layer
1260P: projection 1270: adhesive layer
2700: second light reflective paper 2710: retroreflective layer
BS1, TS1: first and second surfaces G1, G2: first and second sub-groove
S1, S2: first and second sides
SL1: a length in a direction perpendicular to the second surface S2
SL2: a length in a direction perpendicular to the first surface S1
L1: Light reflective paper length T1: Light reflective paper thickness
UG1: unit groove UP1: unit pattern

Claims (13)

a body portion having a pattern portion on the upper surface; and
and a jig including a receiving part in which the body part is accommodated;
The pattern portion includes a plurality of patterns inclined in the same direction,
The plurality of patterns are spaced apart from each other,
Each of the plurality of patterns comprises a plurality of first sub-patterns and a plurality of second sub-patterns. The method of claim 1,
The plurality of patterns are embossed patterns in the inclined direction. The method of claim 1,
The plurality of patterns is a mold for manufacturing a light reflective paper that is a pattern engraved in the inclined direction. The method of claim 1,
The pattern part,
a plurality of first surfaces parallel to and spaced apart from each other; and
A plurality of second surfaces parallel to and spaced apart from each other;
The second side is located between the first side,
The first and second surfaces have different inclination angles with respect to the same surface, and the plurality of patterns are formed on at least one of the first and second surfaces. The method of claim 1,
The first and second sub-patterns are a triangular pyramid for manufacturing a light reflective paper. The method of claim 1,
The first and second sub-patterns are grooves in which a triangular pyramid can be accommodated. forming a pattern on an upper surface of the plurality of unit mold material layers;
tilting the plurality of unit mold material layers at the same inclination angle; and
Containing; stacking and bonding the plurality of unit mold material layers horizontally while maintaining the inclination angle;
A method of manufacturing a mold for manufacturing a light reflective paper maintaining the same height of the pattern in the step of horizontally stacking and combining. 8. The method of claim 7,
forming a mold material layer covering the pattern on the horizontally stacked and combined resultant; and
Separating the mold material layer from the resultant; manufacturing method of a mold for light reflective paper further comprising a. lower layer;
a retroreflective layer provided on the lower layer; and
Including; an upper layer provided on the retroreflective layer;
The retroreflective layer is a light reflective paper comprising a pattern structured so that the light reflectance for the incident light is higher than that of the normally incident light. 10. The method of claim 9,
The structured pattern includes a plurality of first patterns inclined in a first direction with respect to a bottom surface of the retroreflective layer, wherein the plurality of first patterns are spaced apart from each other in a horizontal direction. 11. The method of claim 10,
The structured pattern is disposed to be inclined in a second direction different from the first direction with respect to the bottom surface of the retroreflective layer, and the light reflective paper including a plurality of second patterns spaced apart from each other in a horizontal direction. 12. The method of claim 11,
The plurality of first patterns and the plurality of second patterns are light reflective paper disposed in different regions. In the manufacturing method of light reflective paper comprising a retroreflective layer between the protective layer and the adhesive layer,
The method of manufacturing a light reflective paper in which the retroreflective layer is formed using the mold of claim 1.

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