KR101865471B1 - The heat shielding film and manufacturing method thereof - Google Patents

Abstract

The present invention can be applied to a color display device that uses only a compound (indium tin oxide (ITO), niobium oxide (Nb ₂ O ₅ ), and silver (Ag) It is possible to use the existing coating equipment as it is without any additional equipment modification or process change for the color development of the film, and it is possible to use the existing coating equipment without using any color variable material, (Nb ₂ O ₅ ) layer and an indium tin oxide (ITO) -silver (Ag) -indium tin oxide (ITO) layer on a PET base film, wherein the niobium oxide Wherein at least two unit layers having a structure in which an indium tin oxide (ITO) -silver (Ag) -indium tin oxide (ITO) layer is laminated are laminated on the PET base film.

Description

TECHNICAL FIELD [0001] The present invention relates to a heat shield film having a color and a manufacturing method thereof,

The present invention relates to a heat shielding film having a color and a method of manufacturing the same, and more particularly, to a method of manufacturing a heat shielding film having a color and a method of manufacturing the same, in which only a compound (indium tin oxide (ITO), niobium pentoxide (Nb ₂ O ₅ ) It is possible to express desired color without adding additional color changeable material at the same time and it is possible to use the existing coating facility as it is without any additional equipment modification or process change in order to express color of film, The present invention relates to a thermal barrier film having a color that can be produced by an inexpensive production cost, and a method for producing the same.

Recently, as an example of energy saving measures, heat shielding films have been used as means for controlling heat energy through a building or a vehicle window where people live.

Conventional films used for buildings or vehicle windows have used reflection film, which totally reflects visible light, ultraviolet rays and infrared rays (heat rays) in a way that blocks solar heat through glass tinting. However, due to the nature of the reflective film, the room is darkened during the construction process, and there is a vicious cycle in which the heat must be turned on again. As a result, a heat shielding film is developed to improve the problem.

The heat shield film is a state-of-the-art film that adjusts absorption reflection according to frequency (visible light, ultraviolet light, infrared light). It can be manufactured by passing visible light and adjusting transmittance to harmful ultraviolet and infrared rays. , Which reduces the use of air conditioners in summer and reduces the utilization rate of radiators in winter.

(ATO), indium tin oxide (ITO), silica dioxide (SiO ₂ ), alumina trioxide (Al ₂ O ₃ ), and 3 (Al ₂ O ₃ ) Among them, molybdenum oxide (MoO ₃ ), niobium pentoxide (Nb ₂ O ₅ ), vanadium pentoxide (V ₂ O ₅ ) and tungsten bronze (Ag) Examples of inorganic oxides having good infrared shielding properties include antimony tin oxide (ATO), indium tin oxide (ITO), and tungsten bronze.

In recent years, attempts have been made to apply various colors to such short film. In this regard, the conventional heat shield film is composed of a variable color solar ray control film, which is obtained by adding a photochromic dye of a phenol-ketone compound or spurofherane compound of Korean Patent Publication No. 1996-0021518, A photo reversible coloring light-shielding material using a pressure-sensitive adhesive containing an organic photochromic compound of Japanese Patent Application No. 10-39134, and an organic photochromic material of Japanese Patent Application Laid-open No. 9-300516 on both sides of a base film Shielding films for vehicles and light-shielding windows for vehicles are known.

However, in the case of the above-mentioned patents, organic photochromic materials are widely used as general color variable materials, and azo benzene compounds, thioindigo compounds, anthracene compounds, triphenylmethane compounds, spiropyran compounds, The organic photochromic materials are easily dissolved in an organic solvent and mixed with a polymer binder to form a coating film, which is colored when exposed to natural light and sunlight Has the ability to decolorize again when there is no sunlight, but in a matter of days the variability is lost and organic molecules are destroyed and become transparent.

In the bleach state of the organic photochromic material, the substituent of the cyclic bond is opened in a colored state, and a double bond is formed, and the pigment acts as a chromophore and appears as a color in the human vision. The generation of unstable double bonds results in a stable state of bonding or a by-product, which is a third state that can not be reversible due to the destruction of double bonds, so that it can no longer be changed. In particular, materials having such weak molecular properties are always unsuitable for window films exposed to natural light and sunlight, and these materials are functional coloring matter, and most of them are imported at very high prices in Japan and the United States. It is true that there are many problems.

That is, as a conventional technique as described above, the solar light control film using the organic photochromic compound does not improve the limit of the durability of the organic photochromic compound. In particular, the organic photochromic compound, which has no basic infrared ray blocking property, It has only the effect of blocking the short wavelength even in the change of the light ray, that is, the visible light region. In addition, the film formed by mixing the organic photochromic mentioned in the Japanese Laid-open patent in the pressure-sensitive adhesive has a remarkably low durability. The reason for this is that the radicals of the curing agent in the composition of the organic photochromic molecules and the pressure-sensitive adhesive adversely affect the discoloration of the organic photochromic molecules, so that the durability thereof is remarkably deteriorated. Smart window windows are made of electrochromic materials, which are colored by electrical oxidation and reduction reactions. Such a smart window has a liquid electrolyte layer and is difficult to film and requires an additional device such as an electric control box, which is inconvenient to use and install, and the manufacturing cost is very high due to low productivity and high defect rate . When it is used repeatedly, the charge amount according to the repetition time is lower than the initial charge, and there are many problems in its functionality.

SUMMARY OF THE INVENTION The present invention has been conceived in order to solve the problems as described above, and it is an object of the present invention to provide a method for manufacturing a heat shielding material by using only compounds (indium tin oxide (ITO), niobium oxide (Nb ₂ O ₅ ), silver (Ag) The present invention has been made to solve the above problems, and it is an object of the present invention to provide a heat shielding film which exhibits a desired color without addition of an additional color changeable material.

According to the present invention, a niobium oxide (Nb ₂ O ₅ ) layer and an indium tin oxide (ITO) -silver (Ag) -indium tin oxide (ITO) layer are laminated on a PET base film, Wherein at least two unit layers having a structure in which a tin oxide (ITO) -silver (Ag) -indium tin oxide (ITO) layer is laminated are laminated on the PET base film.

Preferably, the niobium oxide (Nb ₂ O ₅ ) layer has a thickness of 24 to 30 nm, the indium tin oxide (ITO) layer has a thickness of 19 to 22 nm, the silver layer has a thickness of 10 And has a thickness of ~ 12 nm so that the heat shield film has a blue color.

Preferably, the niobium oxide (Nb ₂ O ₅ ) layer has a thickness of 19 to 24 nm, the indium tin oxide (ITO) layer has a thickness of 17 to 19 nm, and the silver layer has a thickness of 10 To 12 nm thick so that the heat shield film has a violet color.

According to another aspect of the present invention, a PET base film is wound on a drum in a chamber maintained in a vacuum state, and a plurality of targets disposed around the drum are driven to perform multilayer sputtering on a PET base film, niobium oxide in accordance with the direction of rotation of the drum (Nb ₂ O ₅₎ target, an indium tin oxide (ITO) target, a silver (Ag) target, an indium tin oxide (ITO) target, niobium oxide (Nb ₂ O ₅₎ targets, the oxidation niobium (Nb ₂ O ₅₎ target, an indium tin oxide (ITO) target, a silver (Ag) target, an indium tin oxide (ITO) target, niobium oxide (Nb ₂ O ₅₎ to place the target in order deposition of PET base film And a metal layer is sequentially coated on the target portion.

Preferably, the niobium oxide (Nb ₂ O ₅ ) layer is formed to a thickness of 24 to 30 nm by adjusting the rotation speed of the drum or the driving time of the target when coating the metal layer, and the indium tin oxide ITO) layer is formed to have a thickness of 19 to 22 nm, and the silver (Ag) layer is formed to have a thickness of 10 to 12 nm so that the heat shield film has a blue hue.

Preferably, the niobium oxide (Nb ₂ O ₅ ) layer is formed to a thickness of 19 to 24 nm by adjusting the rotation speed of the drum or the driving time of the target when the metal layer is coated, and the indium tin oxide ITO) layer is formed to a thickness of 17 to 19 nm, and the silver (Ag) layer is formed to a thickness of 10 to 12 nm so that the heat shield film has a violet color.

According to the present invention, it is possible to use only a compound (indium tin oxide (ITO), niobium pentoxide (Nb ₂ O ₅ ), silver (Ag)) used as a conventional heat insulating material and without adding an additional color- It becomes possible to manufacture a heat short film in which a desired color is expressed.

Accordingly, it is possible to use the existing coating equipment as it is without any additional equipment modification or process change for color development of the film, and it is advantageous in that it can be manufactured by an inexpensive production cost without using a separate color-changeable material.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a structural view illustrating an interlayer structure of a thermal barrier film according to a conventional method; FIG.
FIG. 2 is a cross-sectional photograph showing an interlayer structure of a heat shielding film according to a conventional method. FIG.
FIG. 3 is a graph of a wavelength-reflectance for color analysis of a heat shield film according to the conventional method.
4 is a structural view illustrating an interlayer structure of a thermal barrier film according to a first embodiment of the present invention;
5 is a cross-sectional photograph for confirming an interlayer structure of a heat shielding film according to the first embodiment of the present invention.
6 is a wavelength-reflectance graph for color analysis of a heat shield film according to the first embodiment of the present invention.
FIG. 7 is a structural view illustrating an interlayer structure of a thermal barrier film according to a second embodiment of the present invention; FIG.
8 is a cross-sectional photograph for confirming an interlayer structure of a heat shielding film according to a second embodiment of the present invention.
9 is a wavelength-reflectance graph for color analysis of a heat shield film according to a second embodiment of the present invention.
10 is a process diagram for explaining a manufacturing process of a heat shielding film according to the present invention.

Hereinafter, a heat shielding film having a color according to the present invention and a method of manufacturing the same will be described in detail with reference to the accompanying drawings.

FIG. 1 is a structural view for explaining a detailed interlayer structure of a thermal barrier film according to the conventional method.

According to the conventional method, a metal component is coated thinly on the surface of a PET (polyethylene terephthalate) base film in vacuum to adjust the reflectance according to the wavelength, thereby passing visible light and adjusting the transmittance to harmful ultraviolet and infrared rays A heat shielding film is produced.

1, a niobium oxide (Nb ₂ O ₅ ) layer having a thickness of 10.8 nm was coated on a transparent PET base film, and an indium tin oxide (ITO) layer was coated thereon to a thickness of 7 nm A silver (Ag) layer was coated to a thickness of 11 nm, an indium tin oxide (ITO) layer was coated thereon to a thickness of 7 nm, and then niobium oxide (Nb ₂ O ₅ ) layer.

In this case, a cross-sectional photograph of a short heat shield film having an actual metal coating is shown in Fig.

When the niobium oxide (Nb ₂ O ₅ ) layer and the ITO-Ag-ITO layer were coated on the PET base film in the thickness described above, the wavelength and reflectance for the color analysis of FIG. As can be seen, no peak is formed at the wavelength of the blue color or the red color, and it is confirmed that the reflectance at the whole wavelength range appears to be normal. In this case, due to the silver (Ag) layer, a slight yellow reflection color appears and the short film in question has a light gold color as a whole.

In the present invention, only the compounds (indium tin oxide (ITO), niobium oxide (Nb ₂ O ₅ ), and silver (Ag)) which are used as conventional heat shims which only exhibit such a light gold color are used, Blue, and violet), and a method of manufacturing the same. Especially, since a desired color is expressed without adding additional color-changeable materials, it is necessary to perform a process of coating the existing coating The present invention proposes a heat shielding film and a manufacturing method thereof that can be used as it is and can be manufactured by an inexpensive production cost without using a separate color variable material.

The refractive index varies depending on the material of each layer constituting the film. In particular, when the thicknesses of the respective layers are different, the refraction direction of the light varies at each wavelength band at the interface between the layers, It will lead to a change in the color of the entire film. In the present invention, by controlling the composition and thickness of the compound layer by using only the compounds (indium tin oxide (ITO), niobium oxide (Nb ₂ O ₅ ), and silver (Ag) Blue, and violet) and a method of manufacturing the same.

≪ Embodiment 1 >

4 is a structural view illustrating an interlayer structure of a thermal barrier film according to a first embodiment of the present invention.

In the first embodiment of the present invention, a PET short film is prepared by placing a PET base film in a vacuum chamber and sequentially coating a multilayer metal coating on the PET base film through a plurality of metal targets. In this process, by adjusting the arrangement of the metal layer to be coated and the thickness of each metal layer, it is possible to control the reflectance according to the wavelength to express the desired color (blue) on the heat shield film as well as the heat shield function.

The thermal barrier film according to the first embodiment of the present invention is formed by laminating a niobium oxide (Nb ₂ O ₅ ) layer and an ITO-Ag-ITO layer on a PET base film.

Here, the ITO-Ag-ITO layer refers to a layer in which an ITO layer, a silver layer, and an ITO layer are sequentially coated.

That is, the thermal barrier film according to the first embodiment of the present invention is niobium (Nb ₂ O _5), first coated with a layer of niobium oxide and then re-coat the ITO-Ag-ITO layer thereon (Nb ₂ O ₅₎ oxidized layer (Nb ₂ O ₅ ) layer, an ITO-Ag-ITO layer, and a niobium oxide (Nb ₂ O ₅ ) layer were further laminated on the PET base film And a 10-layered metal coating layer is laminated on the PET base film.

Therefore, the thermal barrier film according to the first embodiment of the present invention is formed by laminating a niobium oxide (Nb ₂ O ₅ ) layer and an ITO-Ag-ITO layer on a PET base film, wherein ITO-Ag-ITO And two unit layers (five layers) of a structure in which layers are laminated are laminated on a PET base film.

Here, the niobium oxide (Nb ₂ O ₅ ) layer has a function of increasing the refractive index of light and increasing the transmittance of visible light, and can be coated to a thickness of 24 to 30 nm. The indium tin oxide (ITO) layer has a function of protecting the silver (Ag) layer and has a function of increasing the refractive index and can be coated to a thickness of 19 to 22 nm. The silver (Ag) layer has a function of blocking infrared rays (IR) and can be coated with a thickness of 10 to 12 nm. Here, the refractive index of silver (Ag) is 0.7, the refractive index of indium tin oxide (ITO) is 2.0, and the refractive index of niobium oxide (Nb ₂ O ₅ ) is 2.3. In particular, the color can be influenced by the coating thickness of niobium oxide (Nb ₂ O ₅ ) having a high refractive index.

Table 1 below shows the arrangement of the metal layers of the thermal short film produced according to the first embodiment of the present invention and the thickness of each metal layer.

Batch order metal Coating Thickness (nm) Tenth floor Nb ₂ O ₅ 28 Ninth Floor ITO 20 Eighth Floor Ag 11.5 Seventh Floor ITO 22 Sixth Floor Nb ₂ O ₅ 24 Fifth floor Nb ₂ O ₅ 25 Fourth floor ITO 20 Third Floor Ag 11.3 Second layer ITO 20 The first layer Nb ₂ O ₅ 30

In this case, a cross-sectional photograph of the thermal barrier film with the actual metal coating is shown in Fig.

When the niobium oxide (Nb ₂ O ₅ ) layer and the ITO-Ag-ITO layer were coated on the PET base film in the above-described arrangement and thickness, as can be seen from the wavelength and reflectance graph for color analysis in FIG. 6, (See dotted line circles) at wavelengths of red and blue colors, respectively, but higher peaks at blue wavelengths resulted in a blue color for the entire train short film.

≪ Embodiment 2 >

7 is a structural view illustrating an interlayer structure of a heat shield film according to a second embodiment of the present invention.

In the second embodiment of the present invention, the PET base film is also coated with a multilayer metal coating on the PET base film through a plurality of metal targets in a vacuum chamber in order to produce a heat barrier film. In this process, the arrangement of the metal layer to be coated and the thickness of each metal layer are controlled to adjust the reflectance according to the wavelength, so that the desired color (violet) can be expressed in the heat shield film as well as the heat shield film.

The thermal barrier film according to the second embodiment of the present invention is formed by laminating a niobium oxide (Nb ₂ O ₅ ) layer and an ITO-Ag-ITO layer on a PET base film.

Here, the ITO-Ag-ITO layer refers to a layer in which an ITO layer, a silver layer, and an ITO layer are sequentially coated.

That is, the thermal barrier film according to the second embodiment of the present invention, niobium (Nb ₂ O _5), first coated with a layer of niobium oxide and then re-coat the ITO-Ag-ITO layer thereon (Nb ₂ O ₅₎ oxidized layer (Nb ₂ O ₅ ) layer, an ITO-Ag-ITO layer, and a niobium oxide (Nb ₂ O ₅ ) layer were further laminated on the PET base film And a 10-layered metal coating layer is laminated on the PET base film.

Therefore, the thermal barrier film according to the second embodiment of the present invention is formed by laminating a niobium oxide (Nb ₂ O ₅ ) layer and an ITO-Ag-ITO layer on a PET base film, wherein ITO-Ag-ITO And two unit layers (five layers) of a structure in which layers are laminated are laminated on a PET base film.

Here, the niobium oxide (Nb ₂ O ₅ ) layer has a function of increasing the refractive index of light and increasing the transmittance of visible light, and can be coated to a thickness of 19 to 24 nm. The indium tin oxide (ITO) layer has a function of protecting the silver (Ag) layer and has a function of increasing the refractive index and can be coated to a thickness of 17 to 19 nm. The silver (Ag) layer has a function of blocking infrared rays (IR) and can be coated with a thickness of 10 to 12 nm.

Table 2 below shows the arrangement of the metal layers of the thermal short film manufactured according to the second embodiment of the present invention and the thickness of each metal layer.

Batch order metal Coating Thickness (nm) Tenth floor Nb ₂ O ₅ 22 Ninth Floor ITO 18 Eighth Floor Ag 11 Seventh Floor ITO 18 Sixth Floor Nb ₂ O ₅ 22 Fifth floor Nb ₂ O ₅ 22 Fourth floor ITO 18 Third Floor Ag 12 Second layer ITO 18 The first layer Nb ₂ O ₅ 22

In this case, a cross-sectional photograph of the short-circuiting film having the actual metal coating is shown in Fig.

When the niobium oxide (Nb ₂ O ₅ ) layer and the ITO-Ag-ITO layer were coated on the PET base film in the above-described arrangement and thickness, as can be seen from the wavelength and reflectance graph for color analysis in FIG. 9, (See dotted line circles) are formed at the wavelength of red and the wavelength of red color, respectively, but the peaks at the wavelength of blue color and the wavelength of red color are similar to each other, .

 10 is a process diagram for explaining a manufacturing process of a heat shielding film according to the present invention.

10, a sputtering apparatus for manufacturing a thermal barrier film includes a chamber 100 maintained in a vacuum state, a take-up roller 120 for discharging the PET base film 140 into the chamber 100, A winding roller 130 for winding and storing the PET base film 140 unwound from the unwinding roller 120 and a winding roller 130 for winding the yarn between the winding roller 120 and the winding roller 130 in the chamber 100 A drum 110 for transferring the PET base film 140 and a plurality of targets disposed around the drum 110 for sputtering the PET base film 140 to be coated .

Sputtering in the sputtering apparatus according to the present invention accelerates a gas such as argon ionized with argon or the like at a relatively low degree of vacuum so as to collide with a target to eject atoms to form a vapor deposition film on the PET base film 140 to be deposited. Here, in the sputtering apparatus, the target side is a cathode and the PET base film 140 is an anode. First, the chamber 100 is brought close to a vacuum, and then a gas such as argon is flowed into the chamber 100 through a low-pressure gas supplier. When a voltage is applied to the electrode through a sputter gun (not shown), Ar + is ionized and a plasma is generated. Since the target covered with the source material is kept at a negative potential relative to the PET base film 140, the argon gas collides with the target covered by the source material after acceleration, and the source atoms and molecules are released from the target and flown to the PET base film 140 It is a method of deposition.

Here, ten targets are sequentially disposed around the drum 110 along the rotating direction of the drum 110 for the above-described ten layers of metal coating. These ten targets are in turn made up of a niobium oxide (Nb ₂ O ₅ ) target, an indium tin oxide (ITO) target, a silver target, an indium tin oxide (ITO) target, a niobium oxide (Nb ₂ O ₅ ) A niobium (Nb ₂ O ₅ ) target, an indium tin oxide (ITO) target, a silver (Ag) target, an indium tin oxide (ITO) target, and a niobium oxide (Nb ₂ O ₅ ) The area can be shielded.

Accordingly, when the PET base film 140 is transported in accordance with the rotation of the drum 110, inherent metal source atoms and molecules emitted from the target in the region of each target are sequentially stacked on the deposition target site of the PET base film 140 Coating is performed. Here, the order of the targets arranged along the rotational direction of the drum will be in accordance with the order of the metal layers deposited on the PET base film 140. [ In order to adjust the thickness of each metal coating, the rotation speed of the drum 110 may be adjusted in the apparatus control unit or the driving time of the target may be adjusted.

As described above, an optimal embodiment has been disclosed in the drawings and specification. Although specific terms have been employed herein, they are used for purposes of illustration only and are not intended to limit the scope of the invention as defined in the claims or the claims. Therefore, those skilled in the art will appreciate that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

100: chamber 110: drum
120: take-up roller 130: inserting roller
140: PET base film

Claims (6)

delete A niobium oxide (Nb ₂ O ₅ ) layer and an indium tin oxide (ITO) -silver (Ag) -indium tin oxide (ITO) layer are laminated on a PET base film,
At least two unit layers having a structure in which indium tin oxide (ITO) -silver (Ag) -indium tin oxide (ITO) layers are laminated between niobium oxide layers are laminated on the PET base film,
The niobium oxide (Nb ₂ O ₅ ) layer has a thickness of 24 to 30 nm, the indium tin oxide (ITO) layer has a thickness of 19 to 22 nm, the silver layer has a thickness of 10 to 12 nm So that the heat shielding film has a blue color.
A niobium oxide (Nb ₂ O ₅ ) layer and an indium tin oxide (ITO) -silver (Ag) -indium tin oxide (ITO) layer are laminated on a PET base film,
At least two unit layers having a structure in which indium tin oxide (ITO) -silver (Ag) -indium tin oxide (ITO) layers are laminated between niobium oxide layers are laminated on the PET base film,
The niobium oxide (Nb ₂ O ₅ ) layer has a thickness of 19 to 24 nm, the indium tin oxide (ITO) layer has a thickness of 17 to 19 nm, the silver layer has a thickness of 10 to 12 nm So that the heat shielding film has a violet color.
delete A PET base film is wound around a drum in a chamber maintained in a vacuum state, and a plurality of targets disposed around the drum are driven to perform multi-layer sputtering on a PET base film,
Niobium oxide in accordance with the direction of rotation of the drum (Nb ₂ O ₅₎ target, an indium tin oxide (ITO) target, a silver (Ag) target, an indium tin oxide (ITO) target, niobium oxide (Nb ₂ O ₅₎ targets, the oxidation niobium (Nb ₂ O ₅₎ target, an indium tin oxide (ITO) target, a silver (Ag) target, an indium tin oxide (ITO) target, niobium oxide (Nb ₂ O ₅₎ to place the target in order deposition of PET base film A metal layer is sequentially coated on a target site,
When the metal layer is coated, the rotation speed of the drum is controlled or the driving time of the target is controlled,
The niobium oxide (Nb ₂ O ₅ ) layer has a thickness of 24 to 30 nm, the indium tin oxide (ITO) layer has a thickness of 19 to 22 nm, and the silver layer has a thickness of 10 to 12 nm. nm thickness so that the heat shielding film has a blue hue.
A PET base film is wound around a drum in a chamber maintained in a vacuum state, and a plurality of targets disposed around the drum are driven to perform multi-layer sputtering on a PET base film,
Niobium oxide in accordance with the direction of rotation of the drum (Nb ₂ O ₅₎ target, an indium tin oxide (ITO) target, a silver (Ag) target, an indium tin oxide (ITO) target, niobium oxide (Nb ₂ O ₅₎ targets, the oxidation niobium (Nb ₂ O ₅₎ target, an indium tin oxide (ITO) target, a silver (Ag) target, an indium tin oxide (ITO) target, niobium oxide (Nb ₂ O ₅₎ to place the target in order deposition of PET base film A metal layer is sequentially coated on a target site,
When the metal layer is coated, the rotation speed of the drum is controlled or the driving time of the target is controlled,
The niobium oxide (Nb ₂ O ₅ ) layer has a thickness of 19 to 24 nm, the indium tin oxide (ITO) layer has a thickness of 17 to 19 nm, and the silver layer has a thickness of 10 to 12 nm. wherein the thickness of the heat shielding film is set to be in a range of 1 to 20 nm.

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