CN219105197U - Active luminous retro-reflective film - Google Patents

Abstract

The utility model relates to an active luminous retroreflective film which comprises a substrate and a retroreflective film layer, wherein the substrate is provided with a reflective structure, the reflective structure comprises a transparent adhesive layer, a plurality of LED chips and reflective light supporting bodies which are in a conical boss structure, the LED chips and the reflective light supporting bodies are distributed on the substrate at intervals, the transparent adhesive layer encapsulates the LED chips and the reflective light supporting bodies on the substrate, the top of the transparent adhesive layer is provided with a reflective layer in the shape of an inverted conical pit at the position above the LED chips, the retroreflective film layer comprises a retroreflective base layer and a light-transmitting adhesive layer, the retroreflective base layer is positioned on the transparent adhesive layer, and the bottom of the retroreflective base layer is provided with a light-transmitting adhesive layer corresponding to the reflective light supporting bodies. The active luminous retro-reflective film has the advantages of light and thin structure, high light utilization rate, clear display and the like.

Description

Active luminous retro-reflective film

Technical Field

The utility model relates to the field of traffic security equipment, in particular to an active luminous retroreflective film.

Background

The prior art light reflecting film is mainly divided into glass bead type light reflecting film and microprism type light reflecting film, and is widely applied to the fields of various road traffic safety facilities, signboards, advertisements and the like due to the excellent retroreflection property. The light is reflected back to human eyes after passing through the microprisms or the glass beads after the external light source irradiates the front surface of the retroreflective film, so that the human eyes can recognize the information such as color, characters, patterns and the like on the retroreflective film.

Along with the application development of illumination technologies such as LED light sources, the light sources are arranged on the back surface of the retroreflective film, and part of light can be transmitted from the back surface, so that the retroreflective film is lightened, and the human eyes can recognize the information such as color, characters, patterns and the like on the retroreflective film without direct irradiation of other external light sources, so that convenience is brought to safe activities at night and effective acquisition of travel and information of people, and the retroreflective film is popular in the market.

However, the existing retroreflective film is designed based on the principle of retroreflection, and the quantity of light transmitted through the film from the back surface is extremely low, and the light transmittance is usually only about 25%; because of the need of considering the back reflection function, the transmittance of the back surface of the back reflection film is difficult to exceed 50% even after optimization, and meanwhile, because the light rays emitted by the internal light source are deflected in a large angle after passing through the back reflection structure, the central light rays are weak, and the light rays in the effective angle range of-20 degrees to +20 degrees are less (as shown in figure 7), so that the effective light energy utilization efficiency of the active luminous identification structure is extremely low, and the great energy waste is caused.

In addition, the light source is arranged on the back of the retro-reflection film, and a box body is usually required to fix and protect the light source, so that the retro-reflection film has the problems of thick structure, complex process, unreliable quality and the like; in addition, the manner of arranging the light source by forming small holes at the positions of the light source corresponding to the LED on the aluminum alloy bottom plate for adhering and fixing the retro-reflection film can cause the reduction of the strength of the fixing structure of the retro-reflection film, increase the complexity of the process and cause the problems of dust prevention, water prevention and the like of the retro-reflection film.

Disclosure of Invention

The utility model aims to provide an active luminous retroreflective film which is light and thin in structure, high in light utilization rate and clear in display.

The utility model provides an initiative luminous retro-reflection film, includes base plate and retro-reflection film layer, be equipped with the reflection structure on the base plate, the reflection structure includes transparent glue film, a plurality of LED chip and shape and is the reflection light supporter of toper boss structure, the LED chip with reflection light supporter interval distribution is in on the base plate, transparent glue film encapsulates LED chip and reflection light supporter on the base plate, transparent glue film top is in the position department of LED chip top is equipped with the reflector layer of back toper pit shape, the retro-reflection film layer includes retroreflection basic unit and printing opacity adhesive layer, retroreflection basic unit is located on the transparent glue film, retroreflection basic unit bottom is corresponding be equipped with printing opacity adhesive layer on the reflection light supporter.

According to the technical scheme, the reflective structure is additionally arranged in the substrate and the retro-reflective film layer, the reflective structure is of a three-layer mutually overlapped hierarchical structure, the reflective light support bodies and the LED chips in the reflective structure are closely attached to each other, the transparent adhesive layer is adopted for fixing, no additional fixing structure or other hierarchical structures for helping reflection are needed, space is greatly saved, the maximum height of the reflective light support body is the maximum height of the reflective structure, the rest parts are lower than the height of the reflective light support body, the integral thickness of the reflective structure is reduced, the structure is simpler and more compact, and compared with the product with more light scattering structures or fixing structures in the prior art, the reflective light support is simpler and lighter and thinner; the light source is characterized in that the reflecting light supporting body is in a conical boss shape, the side surface of the reflecting light supporting body can reflect part of light rays with large vertical angles emitted by the LED chips, the angles of the light rays are concentrated and projected on the effective area through the arranged light-transmitting adhesive layer, so that light waste is effectively avoided, power consumption is reduced, and the light utilization rate is improved; the light-transmitting adhesive layer is arranged on the top of the reflective light support body, light irradiated by an external light source can be reflected by the reflective substrate layer, the light-transmitting adhesive layer is filled in the reflective substrate layer, so that the light is not reflected by the reflective substrate layer in the area, the light can directly pass through the area to form a light-transmitting area, the rest part forms a reflective area, the information displayed by the reflective film is clearer under the combined action of the light-transmitting area and the reflective area, and the information such as color, characters and patterns on the reflective film can be identified by human eyes more easily, thereby providing a guarantee for effective acquisition of the information and safe travel of a road.

Further, the reflective support body is a conical boss-shaped reflective structure which comprises a reflective material and has high reflectivity on the surface.

In the above technical scheme, the reflection of light supporter is transparent glue and solidifies the reflection structure that forms after the vacuum mould pressing, and its surface spraying has reflective material, and is high to the reflectivity of light, and reflection effect is outstanding, simultaneously the reflection of light supporter adopts the shape structure of toper boss, and its side is the curved surface that has certain slope, can concentrate the reflection upwards with the light that falls on this curved surface, makes light concentrate and throws in effective region, effectively improves light utilization ratio, reduces extravagant and the consumption of light.

Further, the plurality of LED chips arranged on the substrate are distributed in a regular array, and the reflected light supporting bodies are distributed in the intervals of the LED chips.

In the above technical scheme, the plurality of LED chips are arranged on the substrate in a regular arrangement of squares, diamonds or other polygons, the reflected light supports are distributed in the intervals of the LED chips, and the whole distribution is uniform, so that the space on the substrate is reasonably utilized.

Further, the transparent adhesive layer is filled in the interval between the LED chip and the reflected light supporting body, and the LED chip and the reflected light supporting body are wrapped.

In the above technical scheme, the transparent glue layer wraps up the plurality of LED chips and the reflective light support body, and fills the interval between the LED chips and the reflective light support body, wherein, the maximum height of the transparent glue layer is lower than the height of the reflective light support body, so as to avoid covering the top of the reflective light support body, influencing the setting and use of other subsequent structures.

Further, an inverted cone-shaped pit structure is arranged at the position, above the LED chip, of the top of the transparent adhesive layer, and the light reflecting layer is filled in the pit structure.

In the above technical scheme, the transparent adhesive layer above the LED chip is provided with the inverted cone-shaped reflecting layer, the reflecting layer comprises reflecting materials, the bus of the inverted cone-shaped structure is a curve, partial light rays with smaller angles in the vertical direction emitted by the LED chip can be reflected to the adjacent reflecting light supporting bodies, and then the light rays pass through the light-transmitting adhesive layer after being secondarily reflected by the reflecting light supporting bodies, so that the light rays are concentrated and projected on an effective area, the light utilization rate is improved, and the light waste is reduced.

Further, the light reflecting layer is of an opaque colloid structure containing light reflecting materials.

In the above technical scheme, the light reflecting layer is a colloid layer structure made of opaque materials with excellent light reflecting performance, has excellent light reflecting performance and high reflectivity, and can reflect part of light with small vertical direction angle emitted by the LED chip to the side surface of the reflecting light support body, and then the light is projected on the effective area through the light transmitting adhesive layer after secondary reflection by the side surface of the reflecting light support body.

Further, a refractive structure with a high refractive index is arranged in the retroreflective base layer.

In the above technical scheme, the glass beads or the microprism structure with high refractive index is arranged in the retroreflective base layer, and the retroreflected light can be reflected back in the original direction after being refracted, so that the information on the retroreflective film can be displayed through the retroreflection effect when the retroreflective film is irradiated by an external light source.

Further, the light-transmitting adhesive layer covers and fills the refractive structure inside the retroreflective base layer.

In the above technical scheme, the light-transmitting adhesive layer is located in the retroreflective base layer at the top position of the reflective light support, and the width of the light-transmitting adhesive layer is greater than that of the top of the reflective light support, where the light-transmitting adhesive layer can be filled with glass beads or microprism structures in the retroreflective base layer, so that light rays are not refracted in the region any more and can directly pass through the region.

Further, the light-transmitting bonding layer is of a colloid structure with a smooth surface and containing a light-homogenizing material.

In the above technical scheme, the printing opacity adhesive linkage is smooth linear colloid structure in surface, and its inside adds has the even light material of helping even light, makes light more even after passing printing opacity adhesive linkage, and visual effect is more comfortable.

Further, an adhesive layer is arranged on the other surface of the substrate, which is far away from the retroreflection film layer, and the adhesive layer covers and is attached to the bottom surface of the substrate.

In the above technical scheme, the other surface of the substrate, which does not include the retroreflective film layer, is provided with an adhesive layer, and the adhesive layer covers the bottom surface of the whole substrate and is used for adhering to the surface of an object to be used.

Compared with the prior art, the active luminous retroreflective film has the following beneficial effects:

first, the structure is frivolous, the utility model adds the reflecting structure in base plate and retro-reflecting film layer, the whole is three-layer each other superimposed hierarchical structure, laminate closely each other, compare with the product with more astigmatism structure or fixed structure added in the prior art, it is more simple frivolous.

The second, the light utilization rate is high, the said reflecting light supporting body of the utility model is the shape of conical boss, its side can reflect some light that the vertical direction angle sent out on the LED chip is big, make the light angle gather and throw on the effective area through the transparent bond line that sets up, avoid the light to waste effectively, reduce the power consumption, raise the light utilization rate, meanwhile, each LED chip top is equipped with the reflecting layer of the reverse conical shape, can reflect some light that the vertical direction angle is small to the side of the said reflecting light supporting body, throw on the effective area through transparent bond line that sets up after being reflected by the side of the reflecting light supporting body again, have greatly reduced the light to waste and power consumption, further raised the light utilization rate.

Third, show clearly, the reflection structure is covered with the back reflection basic unit, be equipped with the printing opacity adhesive linkage on the reflection light supporter top, the back reflection basic unit can carry out the back reflection to the light that external light source shines, the printing opacity adhesive linkage is filled in the back reflection basic unit makes the back reflection basic unit in this region no longer produce the back reflection to light, and light can directly pass through this region, forms the printing opacity district, and other parts form the back reflection district under the combined action of printing opacity district and back reflection district, make the information that the back reflection membrane shows clearly more clearly and clearly, information such as colour, characters and pattern on the back reflection membrane are more discerned to the human eye.

Drawings

FIG. 1 is a schematic diagram of an active light-emitting retroreflective film according to the present utility model.

Fig. 2 is an enlarged view of a partial area in fig. 1.

FIG. 3 is a schematic diagram of the active light-emitting retroreflective film of the present utility model in use to display information.

FIG. 4 is a schematic view of an active light-emitting retroreflective film of the present utility model.

Fig. 5 is a schematic diagram of light distribution of the LED chip light source according to the present utility model.

FIG. 6 is a schematic view showing the light distribution of the active light-emitting retroreflective film of the present utility model.

Fig. 7 is a schematic diagram showing light distribution of a prior art LED backlight retroreflective film.

Detailed Description

The active light-emitting retroreflective film of the present utility model will be described in further detail with reference to specific examples and drawings.

Referring to fig. 1 to 6, in a non-limiting embodiment of the present utility model, an active light-emitting retroreflective film includes a substrate 10 and a retroreflective film layer 30, a reflective structure 20 is disposed on the substrate 10, the reflective structure 20 includes a transparent adhesive layer 24, a plurality of LED chips 21 and a reflective light support 22 having a tapered boss structure, the LED chips 21 and the reflective light support 22 are distributed on the substrate 10 at intervals, the transparent adhesive layer 24 encapsulates the LED chips 21 and the reflective light support 22 on the substrate 10, a reflective layer 23 having a reverse tapered pit shape is disposed on top of the transparent adhesive layer 24 at a position above the LED chips 21, the retroreflective film layer 30 includes a retroreflective base layer 32 and a light-transmitting adhesive layer 31, the retroreflective base layer 32 is disposed on the transparent adhesive layer 24, and a light-transmitting adhesive layer 31 is disposed on a bottom of the retroreflective base layer 32 at a position corresponding to the reflective light support 22; in this embodiment, the reflective structure 20 is added in the substrate 10 and the retroreflective film layer 30, the reflective structure 20 is in a three-layer stacked hierarchical structure, the reflective light support 22 and the LED chip 21 in the reflective structure 20 are closely adhered to each other, and are fixed by the transparent adhesive layer 24, so that no additional fixing structure or other hierarchical structure for helping reflection is needed, the space is greatly saved, the maximum height of the reflective light support 22 is the maximum height of the reflective structure 20, and the rest is lower than the height of the reflective light support 22, so that the thickness of the reflective structure 20 is reduced, and the structure is simpler and more compact than the product with more light scattering structures or fixing structures in the prior art; the reflective light supporting body 22 is in a shape of a conical boss, the side surface of the reflective light supporting body can reflect part of light rays with large vertical angles emitted by the LED chips 21, so that the light rays are concentrated in angles and projected on an effective area through the arranged light-transmitting adhesive layer 31, the light waste is effectively avoided, the power consumption is reduced, and the light utilization rate is improved; the reflective structure 20 is covered with a retroreflective base layer 32, a light-transmitting adhesive layer 31 is arranged on the top of the reflective light support 22, the retroreflective base layer 32 can retroreflect light irradiated by an external light source, the light-transmitting adhesive layer 31 is filled in the retroreflective base layer 32, so that the retroreflective base layer 32 in the area can not retroreflect light any more, the light can directly pass through the area to form a light-transmitting area 50, the rest forms a retroreflective area 60, the information displayed by the retroreflective film is more clear under the combined action of the light-transmitting area 50 and the retroreflective area 60, and the human eyes can more easily recognize the information such as color, characters and patterns on the retroreflective film, thereby providing a guarantee for effective acquisition of information and safe travel of roads; in this embodiment, specifically, after the light emitted by the LED chip is reflected and redistributed by the internal structure, the angles of the light coming out of the retro-reflective film are concentrated and distributed within a range of-20 ° to +20°, and the light ratio within the effective range is large, so that the light intensity is high; in this embodiment, the substrate 10 preferably uses a PET (polyethylene terephthalate) material as a base material, and other materials may be used instead of the PET material.

Referring to fig. 1 to 4, in a non-limiting embodiment of the present utility model, the reflective support 22 is a conical boss-shaped reflective structure with a high reflectivity on the surface, and comprises a reflective material; in this embodiment, the reflective support 22 is a reflective structure formed by curing transparent glue after vacuum molding, and the surface of the reflective support is coated with reflective material, so that the reflective support has high reflectivity to light and excellent reflective effect, and meanwhile, the reflective support 22 adopts a conical boss-shaped structure, and the side surface of the reflective support is a curved surface with a certain slope, so that the light falling on the curved surface can be reflected upwards in a concentrated manner, so that the light is projected in an effective area in a concentrated manner, the light utilization rate is effectively improved, and the light waste and the power consumption are reduced; in this embodiment, the reflective light supporting body 22 preferably adopts a conical boss shape structure, and of course, a conical or other structures with inclined surfaces or curved surfaces on the sides can be adopted instead of the conical boss shape structure; in this embodiment, the reflective light support 22 is preferably made of TPU hot melt adhesive, and titanium dioxide particles are added in the reflective light support, and other hot melt materials, thermosetting materials or thermoplastic materials can be used instead of the above materials.

Referring to fig. 1 to 2, in a non-limiting embodiment of the present utility model, a plurality of LED chips 21 disposed on the substrate 10 are distributed in a regular array, and the reflective light supports 22 are distributed in the intervals of the LED chips 21; in this embodiment, preferably, the plurality of LED chips 21 are regularly arranged and distributed on the substrate 10 in square, diamond or other polygons, and besides the regular arrangement of squares, diamond or other polygons, a distribution mode of circles or other centrosymmetric patterns may also be adopted, and the reflective light supporting bodies 22 are distributed in the intervals of the LED chips 21, so that the overall distribution is uniform, and the space on the substrate 10 is reasonably utilized; in this embodiment, the LED chips 21 preferably have a center-to-center spacing of 3-6mm.

Referring to fig. 1 to 2, in a non-limiting embodiment of the present utility model, the transparent adhesive layer 24 is filled in the space between the LED chip 21 and the reflective light support 22, and encapsulates the LED chip 21 and the reflective light support 22; in this embodiment, the transparent adhesive layer 24 wraps the LED chips 21 and the reflective light support 22 and fills the space between the LED chips 21 and the reflective light support 22, preferably, the maximum height of the transparent adhesive layer 24 is slightly lower than the height of the reflective light support 22, so as not to cover the top of the reflective light support 22, thereby affecting the arrangement and use of other subsequent structures; in this embodiment, preferably, the transparent adhesive layer 24 and the reflective light support 22 are both in a height range of 0.3-1mm, wherein the maximum height of the transparent adhesive layer 24 needs to be lower than the maximum height of the reflective light support 22, so as to avoid the glue covering the top of the reflective light support 22, which affects the setting and use effects of the subsequent light-transmitting adhesive layer 31 or other structures; in this embodiment, the transparent adhesive layer 24 is preferably made of polyacrylate aqueous solution, modified polyurethane aqueous solution, silica gel, UV gel or epoxy resin gel, and a reflective material is added, and other materials such as a hot melt material, a thermosetting material or a thermoplastic material may be used instead of the above materials.

Referring to fig. 1 to 4, in a non-limiting embodiment of the present utility model, an inverted cone-shaped pit structure is disposed on the top of the transparent adhesive layer 24 at a position above the LED chip 21, and the light reflecting layer 23 is filled in the pit structure; in this embodiment, the transparent adhesive layer 24 above the LED chip 21 is provided with an inverted cone-shaped reflective layer 23, the reflective layer 23 includes a reflective material, and a bus of the inverted cone-shaped structure is curved, so that a portion of light emitted by the LED chip 21 with a smaller angle in the vertical direction can be reflected onto an adjacent reflective light support 22, and then reflected by the reflective light support 22 for the second time and then passes through the light-transmitting adhesive layer 31, so that the light is projected onto an effective area in a concentrated manner, thereby improving the light utilization rate and reducing the light waste; in this embodiment of the present utility model, the light reflecting layer 23 is preferably an inverted cone structure with a curved bus bar, which is beneficial for reflecting light to the reflecting light support 22 at an angle obliquely downward, and besides this structure, a structure with a straight line, an arc or other shapes of bus bars may be used.

Referring to fig. 1 to 4, in a non-limiting embodiment of the present utility model, the light reflecting layer 23 is an opaque colloid structure containing a light reflecting material; in this embodiment, the light reflecting layer 23 is a colloid layer structure made of opaque material with excellent light reflecting performance, and has excellent light reflecting performance and high reflectivity, and can reflect part of light emitted by the LED chip 21 with small vertical angle onto the side surface of the light reflecting support 22, and then the light is projected onto the effective area through the light transmitting adhesive layer 31 after being secondarily reflected by the side surface of the light reflecting support 22.

Referring to fig. 1-4, in a non-limiting embodiment of the present utility model, a refractive structure with a high refractive index is disposed in the retroreflective base layer 32; in this embodiment, preferably, the retroreflective base layer 32 is provided with a microprism structure with a high refractive index, which can retroreflect the irradiated light in the original direction after refracting the irradiated light, so that the information on the retroreflective film can be displayed by the retroreflective effect when the retroreflective film is irradiated by an external light source; in this embodiment, preferably, the material of the microprism structure is one or more of PMMA, PC, PVC, PU or UV resin.

Referring to fig. 1 to 4, in a non-limiting embodiment of the present utility model, the light-transmitting adhesive layer 31 covers and fills the refractive structure inside the retroreflective base layer 32; in this embodiment, the light-transmitting adhesive layer 31 is located in the retroreflective base layer 32 at the top position of the reflective light support 22, and the width of the light-transmitting adhesive layer 31 is greater than the width of the top of the reflective light support 22, where the light-transmitting adhesive layer 31 may be filled with glass beads or microprism structures in the retroreflective base layer 32, so that light rays are not refracted in this area any more and can directly pass through this area.

Referring to fig. 1 to 4, in a non-limiting embodiment of the present utility model, the light-transmitting adhesive layer 31 is a smooth-surface colloid structure containing a light-homogenizing material; in this embodiment, the light-transmitting adhesive layer 31 is a linear colloid structure with a smooth surface, and a light-homogenizing material for assisting in homogenizing is added in the light-transmitting adhesive layer 31, so that light is more uniform after passing through the light-transmitting adhesive layer 31, and the visual effect is more comfortable; in this embodiment, at least one of titanium dioxide particles, silicate particles, and plastic particles for uniform light is preferably added to the light-transmitting adhesive layer 31, and other materials having uniform light properties may be used in addition to the above materials.

Referring to fig. 1 to 2, in a non-limiting embodiment of the present utility model, an adhesive layer 40 is disposed on the other surface of the substrate 10 away from the retroreflective film layer 30, and the adhesive layer 40 covers and is attached to the bottom surface of the substrate 10; in this embodiment, the other surface of the substrate 10, which does not include the retroreflective film layer 30, is provided with an adhesive layer 40, and the adhesive layer 40 covers the entire bottom surface of the substrate 10 and is used for adhering to the surface of an object to be used.

In the description of the present utility model, it should be understood that the terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, in the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

While the utility model has been described in conjunction with the specific embodiments above, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, all such alternatives, modifications, and variations are included within the spirit and scope of the following claims.

Claims (7)

1. The utility model provides an initiative luminous retro-reflection film, includes base plate and retro-reflection film layer, its characterized in that, be equipped with the reflection structure on the base plate, the reflection structure includes transparent glue film, a plurality of LED chip and shape and is the reflection light supporter of toper boss structure, the LED chip with reflection light supporter interval distribution is in on the base plate, transparent glue film encapsulates LED chip and reflection light supporter on the base plate, transparent glue film top is in the position department of LED chip top is equipped with the reflector layer of back taper pit shape, the retro-reflection film layer includes retro-reflection basic unit and printing opacity adhesive layer, the retro-reflection basic unit is located on the transparent glue film, retro-reflection basic unit bottom is corresponding be equipped with printing opacity adhesive layer on the reflection light supporter.

2. The active light-emitting retroreflective film of claim 1 wherein the plurality of LED chips disposed on the substrate are distributed in a regular array and the reflective light supports are distributed in the spacing of the LED chips.

3. The active light-emitting retroreflective film of claim 2, wherein the transparent adhesive layer is filled in the space between the LED chip and the reflective light support, and encapsulates the LED chip and the reflective light support.

4. The active light-emitting retroreflective film of claim 3 wherein the top of the transparent adhesive layer is provided with an inverted cone-shaped pit structure at a position above the LED chip, and the retroreflective layer is filled in the pit structure.

5. The film of claim 1, wherein the retroreflective base layer has a refractive structure with a high refractive index.

6. The film of claim 1, wherein the light transmissive adhesive layer is a smooth-surfaced gel structure comprising a light homogenizing material.

7. The active light-emitting retroreflective film of claim 1, wherein the other side of the substrate remote from the retroreflective film layer is provided with an adhesive layer that covers and adheres to the bottom surface of the substrate.

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