Composite transparent plate and its manufacturing method

Abstract

To provide a composite transparent plate and a method of manufacturing the same.SOLUTION: A method of manufacturing a composite transparent plate includes a supplying step and a forming step. In the supplying step, a first resin, a second resin, and a third resin are introduced into a first extruder, a second extruder, and a third extruder, respectively, to form a composite transparent film including a corresponding first layer, second layer and third layer. The first resin is selected from the group consisting of Tairilin 3824, Tairilin 3842, Tairilin 390A, Tairilin P115, Tairilin 663G, and SKYGREEN(R) S2008. In the forming step, the composite transparent film is passed through a first forming wheel, a second forming wheel, and a third forming wheel in this order to form the composite transparent plate. The composite transparent plate has a haze value of 0.75% to 4%, and a light transmittance of 86% to 91.5%.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a composite transparent plate and a manufacturing method thereof, and more particularly to a PET composite transparent plate and a manufacturing method thereof. [Background technology]

[0002] Conventional PET transparent sheets are often made from a single raw material, making it difficult to optimize the processing of different layers of the transparent sheet. Furthermore, conventional transparent sheets are prone to crystalline whitening during molding. Summary of the Invention [Problem to be solved by the invention]

[0003] The technical problem to be solved by the present invention is to provide a composite transparent plate and a manufacturing method thereof that overcomes the shortcomings of the prior art, which is the tendency for crystalline whitening to occur during molding. [Means for solving the problem]

[0004] In order to solve the above technical problems, one technical solution adopted by the present invention is to provide a method for manufacturing a composite transparent plate. A method for producing a composite transparent board includes: a supplying step of feeding a first resin, a second resin, and a third resin into a first extruder, a second extruder, and a third extruder, respectively, to form a composite transparent film including a corresponding first layer, a second layer, and a third layer; and a molding step of passing the composite transparent film through a first molding wheel, a second molding wheel, and a third molding wheel, in order, to form a composite transparent board, wherein the first resin is selected from the group consisting of Tairilin 3824, Tairilin 3842, Tairilin 390A, Tairilin P115, Tairilin 663G, and SKYGREEN® S2008, the second resin is selected from the group consisting of Tairilin 3760 and Tairilin 3842, and the third resin is selected from the group consisting of Tairilin 3760, Tairilin 3842, Tairilin 380R, and Tairilin 384R, wherein the absolute value of the difference between the temperature of the first forming wheel and the temperature of the second forming wheel is 5°C or less, and the ratio of the temperature of the third forming wheel to the temperature of the first forming wheel or the temperature of the second forming wheel (temperature of the third forming wheel / first forming wheel, or temperature of the third forming wheel / second forming wheel) is 1.8 to 3.5, and the composite transparent plate has a haze value of 0.75% to 4% and a light transmittance of 86% to 91.5%.

[0005] Preferably, the intrinsic viscosity of the first resin is 0.63 dl / g to 1.1 dl / g, the intrinsic viscosity of the second resin is 0.76 dl / g to 1.1 dl / g, and the intrinsic viscosity of the third resin is 0.76 dl / g to 1.1 dl / g.

[0006] Preferably, the temperature of the first forming wheel is 18°C ​​to 25°C, the temperature of the second forming wheel is 18°C ​​to 25°C, and the temperature of the third forming wheel is 35°C to 58°C.

[0007] Preferably, the first layer, the second layer, and the third layer in the composite transparent plate are arranged as follows: third layer / second layer / first layer / second layer / third layer, third layer / second layer / first layer / second layer, third layer / second layer / first layer / third layer, or third layer / second layer / first layer.

[0008] Preferably, the thickness of the first layer accounts for 40% to 70%, the thickness of the second layer accounts for 15% to 40%, and the thickness of the third layer accounts for 10% to 20%, assuming the thickness of the composite transparent plate to be 100%.

[0009] Preferably, the thickness of the composite transparent plate is 0.5 mm to 8 mm.

[0010] Another technical solution adopted by the present invention to solve the above technical problems provides a composite transparent plate, which includes a first layer formed of a first resin, a second layer formed of a second resin, and a third layer formed of a third resin, where the first resin is selected from the group consisting of Tairilin 3824, Tairilin 3842, Tairilin 390A, Tairilin P115, Tairilin 663G, and SKYGREEN® S2008, the second resin is selected from the group consisting of Tairilin 3760 and Tairilin 3842, and the third resin is selected from the group consisting of Tairilin 3760, Tairilin 3842, Tairilin 380R, and Tairilin 384R, and the composite transparent plate has a haze value of 0.75% to 4% and a light transmittance of 86% to 91.5%.

[0011] Preferably, the intrinsic viscosity of the first resin is 0.63 dl / g to 1.1 dl / g, the intrinsic viscosity of the second resin is 0.76 dl / g to 1.1 dl / g, and the intrinsic viscosity of the third resin is 0.76 dl / g to 1.1 dl / g.

[0012] Preferably, the first layer, the second layer, and the third layer in the composite transparent plate are arranged as follows: third layer / second layer / first layer / second layer / third layer, third layer / second layer / first layer / second layer, third layer / second layer / first layer / third layer, or third layer / second layer / first layer.

[0013] Preferably, the thickness of the first layer accounts for 40% to 70%, the thickness of the second layer accounts for 15% to 40%, and the thickness of the third layer accounts for 10% to 20%, assuming the thickness of the composite transparent plate to be 100%. [Effects of the Invention]

[0014] An advantageous effect of the present invention is that the composite transparent plate and manufacturing method thereof according to the present invention have the technical feature that "the first resin is selected from the group consisting of Tairilin 3824, Tairilin 3842, Tairilin 390A, Tairilin P115, Tairilin 663G and SKYGREEN® S2008, the second resin is selected from the group consisting of Tairilin 3760 and Tairilin 3842, and the third resin is selected from the group consisting of Tairilin 3760, Tairilin 3842, Tairilin 380R and Tairilin 384R," thereby solving the problem of crystalline whitening occurring easily when molding conventional transparent plates. [Brief explanation of the drawings]

[0015] [Figure 1] 2 is a flowchart of a method for manufacturing a composite transparent panel according to an embodiment of the present invention. [Figure 2] 1 is a schematic diagram of a composite transparent plate according to one embodiment of the present invention. [Figure 3] 1 is a schematic diagram of a composite transparent plate according to one embodiment of the present invention. [Figure 4] 1 is a schematic diagram of a composite transparent plate according to one embodiment of the present invention. [Figure 5] 1 is a schematic diagram of a composite transparent plate according to one embodiment of the present invention. [Figure 6]1 is a schematic diagram of a composite transparent plate according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0016] To better understand the features and technical contents of the present invention, please refer to the following detailed description of the present invention and the accompanying drawings, which are provided for reference and explanation only and are not intended to limit the scope of the present invention.

[0017] The following describes embodiments of a "composite transparent plate and its manufacturing method" according to certain specific embodiments, and those skilled in the art can understand the advantages and effects of the present invention based on the content disclosed herein. The present invention can be implemented or applied in other different specific embodiments, and various modifications and changes can be made to the details herein based on different perspectives and applications without departing from the concept of the present invention. Also, as previously explained, the accompanying drawings of the present invention are for simple schematic illustrations and are not drawn to actual size. The technical content of the present invention will be described in more detail based on the following embodiments, but the disclosed content does not limit the scope of protection of the present invention.

[0018] It should be understood that although the present specification may use terms such as "first," "second," and "third" to describe various elements or signals, these elements or signals are not limited by these terms. These terms are primarily used to distinguish one element from another element or one signal from another signal. Furthermore, the term "or" used in the present specification may include any one or more combinations of the associated listed items, depending on the actual situation.

[0019] [Manufacturing method for composite transparent panels] 1, which is a flowchart of a method for manufacturing a composite transparent panel according to an embodiment of the present invention, the method for manufacturing a composite transparent panel includes a supplying step S110 and a molding step S120. The method for manufacturing a composite transparent panel may further include other steps as necessary, and the present invention is not limited thereto.

[0020] In the supplying step S110, a first resin, a second resin, and a third resin are respectively fed into a first extruder, a second extruder, and a third extruder to form a composite transparent film including a corresponding first layer A, a second layer B, and a third layer C. Specifically, the first resin, the second resin, and the third resin may be fed into the first extruder, the second extruder, and the third extruder in the form of pellets.

[0021] The first resin is selected from the group consisting of Tairilin 3824, Tairilin 3842, Tairilin 390A, Tairilin P115, Tairilin 663G, and SKYGREEN® S2008. The second resin is selected from the group consisting of Tairilin 3760 and Tairilin 3842. The third resin is selected from the group consisting of Tairilin 3760, Tairilin 3842, Tairilin 380R, and Tairilin 384R.

[0022] The melting point (Tm) of Tairilin 3824 is 238°C, the melting point of Tairilin 3842 is 246°C, the melting point of Tairilin 390A is 228°C, the melting point of Tairilin P115 is 228°C, Tairilin 663G has no melting point, SK 2008 has no melting point, Tairilin 380R has a melting point of 248°C, and the melting point of Tairilin 384R is 248°C.

[0023] The first resin may have a melting point of 228°C to 246°C or may have no melting point. The second resin may have a melting point of 246°C to 255°C. The third resin may have a melting point of 246°C to 255°C.

[0024] The intrinsic viscosity of the first resin is 0.63 dL / g to 1.1 dL / g, the intrinsic viscosity of the second resin is 0.76 dL / g to 1.1 dL / g, and the intrinsic viscosity of the third resin is 0.76 dL / g to 1.1 dL / g. Preferably, the intrinsic viscosity of the second resin is 0.76 dL / g to 0.84 dL / g, and the intrinsic viscosity of the third resin is 0.76 dL / g to 0.84 dL / g.

[0025] In one embodiment, the first resin may be a copolyester formed by copolymerization of an alcohol selected from the group consisting of ethylene glycol, propylene glycol, and 1,4-cyclohexanedimethanol with an acid selected from the group consisting of isophthalic acid, terephthalic acid, and 2,6-naphthalenedicarboxylic acid. In one embodiment, the second resin and the third resin are polyethylene terephthalate or a modified polyester composition, although the present invention is not limited thereto.

[0026] The first resin contains diol residues and dicarboxylic acid residues. The total amount of the dicarboxylic acid residues is taken as 100 mol %, and the content of terephthalic acid residues is 70 mol % to 99 mol %, the content of isophthalic acid residues is 1 mol % to 30 mol %, and the content of 2,6-naphthalenedicarboxylic acid residues is 0 mol % to 30 mol %. The total amount of the diol residues is taken as 100 mol %, and the content of the ethylene glycol residues is 50 mol %. ~100 % by mole, the content of propylene glycol residues is 0 to 50 mol %, and the content of cyclohexanedimethanol residues is 0 to 50 mol %. The isophthalic acid residues have the effect of suppressing crystallinity, thereby imparting a specific melting point temperature to the first resin.

[0027] In the forming step S120, the composite transparent film is passed through a first forming wheel, a second forming wheel, and a third forming wheel in this order to form a composite transparent plate 100.

[0028] The absolute value of the difference between the temperature of the first forming wheel and the temperature of the second forming wheel is 5°C or less, and the ratio of the temperature of the third forming wheel to the temperature of the first forming wheel or the second forming wheel is 1.8 to 3.5. In other words, the temperatures of the first forming wheel and the second forming wheel are close to each other, and the temperature of the first forming wheel may be higher than, the same as, or lower than the temperature of the second forming wheel. Preferably, the ratio of the temperature of the third forming wheel to the temperature of the first forming wheel or the second forming wheel is 1.8 to 3.5.

[0029] In this embodiment, the temperature of the first forming wheel is 18°C ​​to 25°C, the temperature of the second forming wheel is 18°C ​​to 25°C, and the temperature of the third forming wheel is 35°C to 58°C. Preferably, the temperature of the first forming wheel is 18°C ​​to 20°C, the temperature of the second forming wheel is 18°C ​​to 22°C, and the temperature of the third forming wheel is 51°C to 58°C. It is noteworthy that in the forming step S120 of this embodiment, the composite transparent film is cooled by the first forming wheel and the second forming wheel, and stress in the composite transparent film is relieved when passing through the third forming wheel.

[0030] It is worth noting that the specific structures of the first extruder, the second extruder, the third extruder, the first forming wheel, the second forming wheel, and the third forming wheel mentioned in the present invention may be changed as needed or may be conventional devices.Furthermore, the specific structures of the first extruder, the second extruder, the third extruder, the first forming wheel, the second forming wheel, and the third forming wheel are not limited as long as they can implement the manufacturing method of the composite transparent plate.

[0031] As shown in Figures 2 to 6, which are schematic diagrams of composite transparent boards according to different embodiments of the present invention, the composite transparent board 100 may have a three-layer structure, a four-layer structure, or a five-layer structure. Specifically, the first layer, the second layer, and the third layer in the composite transparent board are arranged as follows: third layer / second layer / first layer / second layer / third layer, third layer / second layer / first layer / second layer, third layer / second layer / first layer / third layer, or third layer / second layer / first layer. However, in other embodiments, the specific lamination method of the first layer, second layer, and third layer in the composite transparent board may also be changed as necessary, and the present invention is not limited thereto.

[0032] In terms of thickness, the thickness of the composite transparent plate 100 is taken as 100%, with the thickness of the first layer A accounting for 40% to 70%, the thickness of the second layer B accounting for 15% to 40%, and the thickness of the third layer C accounting for 10% to 20%. The thickness of the composite transparent plate 100 is 0.5 mm to 8 mm, and preferably 2 mm to 8 mm.

[0033] It is worth noting that the number of the second layer B and the third layer C may be one or two layers, and when the number of the second layer B and the third layer C is two layers, the thickness of the second layer B is the total thickness of the two second layers B, and the thickness of the third layer C is the total thickness of the two third layers C.

[0034] The composite transparent plate 100 has a haze value of 0.75% to 4% and a total light transmittance of 86% to 91.5%, which is measured according to the ISO 14782 method using light with a wavelength of 400 nm to 800 nm.

[0035] [Composite transparent plate] The embodiment of the present invention also provides a composite transparent plate 100. The composite transparent plate 100 can be manufactured by the composite transparent plate manufacturing method described above, but the present invention is not limited thereto.

[0036] The composite transparent plate 100 includes a first layer A, a second layer B, and a third layer C. The first layer A is made of a first resin selected from the group consisting of Tairilin 3824, Tairilin 3842, Tairilin 390A, Tairilin P115, Tairilin 663G, and SKYGREEN® S2008. The second layer B is made of a second resin selected from the group consisting of Tairilin 3760 and Tairilin 3842. The third layer C is made of a third resin selected from the group consisting of Tairilin 3760, Tairilin 3842, Tairilin 380R, and Tairilin 384R. Preferably, when the materials of the first resins are different, the materials of the second resin and the third resin are the same.

[0037] The intrinsic viscosity of the first resin is 0.63 dL / g to 1.1 dL / g, the intrinsic viscosity of the second resin is 0.76 dL / g to 1.1 dL / g, and the intrinsic viscosity of the third resin is 0.76 dL / g to 1.1 dL / g. Preferably, the intrinsic viscosity of the second resin is 0.76 dL / g to 0.84 dL / g, and the intrinsic viscosity of the third resin is 0.76 dL / g to 0.84 dL / g.

[0038] In this embodiment, the composite transparent plate has a three-layer structure, a four-layer structure, or a five-layer structure. Specifically, the first layer, the second layer, and the third layer in the composite transparent plate are arranged as follows: third layer / second layer / first layer / second layer / third layer, third layer / second layer / first layer / second layer, third layer / second layer / first layer / third layer, or third layer / second layer / first layer.

[0039] With the thickness of the composite transparent plate 100 taken as 100%, the thickness of the first layer A occupies 40% to 70%, the thickness of the second layer B occupies 15% to 40%, and the thickness of the third layer C occupies 10% to 20%.

[0040] The composite transparent plate 100 has a haze value of 0.75% to 4% and a light transmittance of 86% to 91.5%.

[0041] [Measurement of experimental data] The present invention will be explained in detail below with reference to Examples 1 to 6 and Comparative Examples 1 and 2. However, these examples are provided for the purpose of understanding the present invention, and the present invention is not limited thereto.

[0042] Example 1: The first resin was Tairilin 3824, the second resin was Tairilin 3760, and the third resin was Tairilin 3760; the intrinsic viscosity of the first resin was 0.82 dL / g, the intrinsic viscosity of the second resin was 0.76 dL / g, and the intrinsic viscosity of the third resin was 0.76 dL / g; the first layer accounted for 40% of the thickness, the second layer accounted for 40% of the thickness, and the third layer accounted for 20% of the thickness; the temperature of the first forming wheel was 18°C, the temperature of the second forming wheel was 18°C, and the temperature of the third forming wheel was 51°C; the composite transparent board had five layers (as shown in Figure 2) and was laminated in a C / B / A / B / C configuration (A is the first layer, B is the second layer, and C is the third layer).

[0043] Example 2: The first resin was Tairilin 3842, the second resin was Tairilin 3842, and the third resin was Tairilin 3760; the intrinsic viscosity of the first resin was 0.84 dL / g, the intrinsic viscosity of the second resin was 0.84 dL / g, and the intrinsic viscosity of the third resin was 0.76 dL / g; the first layer accounted for 70% of the thickness, the second layer accounted for 15% of the thickness, and the third layer accounted for 15% of the thickness; the temperature of the first forming wheel was 20°C, the temperature of the second forming wheel was 20°C, and the temperature of the third forming wheel was 58°C; and the composite transparent board was four-layered (as shown in FIG. 3 ) and stacked in a C / B / A / B configuration.

[0044] Example 3: The first resin was Tairilin 390A, the second resin was Tairilin 3842, and the third resin was Tairilin 3842; the intrinsic viscosity of the first resin was 0.9 dL / g, the intrinsic viscosity of the second resin was 0.84 dL / g, and the intrinsic viscosity of the third resin was 0.84 dL / g; the first layer accounted for 60% of the thickness, the second layer accounted for 30% of the thickness, and the third layer accounted for 10% of the thickness; the temperature of the first forming wheel was 18°C, the temperature of the second forming wheel was 18°C, and the temperature of the third forming wheel was 55°C; and the composite transparent board was four-layered (as shown in FIG. 4 ) and stacked in a C / B / A / C configuration.

[0045] Example 4: The first resin was Tairilin P115, the second resin was Tairilin 3842, and the third resin was Tairilin 380R, the intrinsic viscosity of the first resin was 1.1 dL / g, the intrinsic viscosity of the second resin was 0.84 dL / g, and the intrinsic viscosity of the third resin was 0.8 dL / g, the first layer accounted for 60% of the thickness, the second layer accounted for 30% of the thickness, and the third layer accounted for 10% of the thickness, the temperature of the first forming wheel was 20°C, the temperature of the second forming wheel was 22°C, and the temperature of the third forming wheel was 55°C, and the composite transparent board was three-layered (as shown in Figure 5) and laminated in a C / B / A configuration.

[0046] Example 5: The first resin was Tairilin 663G, the second resin was Tairilin 3842, and the third resin was Tairilin 3842; the intrinsic viscosity of the first resin was 0.63 dL / g, the intrinsic viscosity of the second resin was 0.84 dL / g, and the intrinsic viscosity of the third resin was 0.84 dL / g; the first layer accounted for 60% of the thickness, the second layer accounted for 30% of the thickness, and the third layer accounted for 10% of the thickness; the temperature of the first forming wheel was 20°C, the temperature of the second forming wheel was 20°C, and the temperature of the third forming wheel was 53°C; and the composite transparent board had five layers (as shown in FIG. 6 ) and was stacked in a C / B / A / B / C configuration.

[0047] Example 6: The first resin was SKYGREEN® S2008, the second resin was Tairilin 3842, and the third resin was Tairilin 384R; the intrinsic viscosity of the first resin was 0.75 dL / g, the intrinsic viscosity of the second resin was 0.84 dL / g, and the intrinsic viscosity of the third resin was 0.84 dL / g; the first layer accounted for 60% of the thickness, the second layer accounted for 30% of the thickness, and the third layer accounted for 10% of the thickness; the temperature of the first forming wheel was 20°C, the temperature of the second forming wheel was 20°C, and the temperature of the third forming wheel was 53°C; and the composite transparent board had five layers (as shown in FIG. 6 ) and was stacked in a C / B / A / B / C configuration.

[0048] Comparative Example 1: The first resin was Tailin 663G, and no second or third resin was used. The intrinsic viscosity of the first resin was 0.63 dl / g. The thickness of the first layer was 100%. The temperature of the first forming wheel was 20°C, the temperature of the second forming wheel was 20°C, and the temperature of the third forming wheel was 53°C.

[0049] Comparative Example 2: The first resin was Tailin 3760, and no second or third resin was used. The intrinsic viscosity of the first resin was 0.76 dl / g. The thickness of the first layer was 100%. The temperature of the first forming wheel was 18°C, the temperature of the second forming wheel was 18°C, and the temperature of the third forming wheel was 51°C.

[0050] The composition and parameters of the components of the composite transparent plates according to Examples 1 to 6 and Comparative Examples 1 and 2 are as shown in the following Table 1. The measurement methods for these will be described later.

[0051] Haze value measurement: Measurement was carried out based on the method of ISO 14782. The haze value (Haze) was calculated based on the following formula. Haze value = Diffuse light transmittance / Total light transmittance x 100%

[0052] Light transmittance measurement: Measurement was carried out based on the ISO 14782 method. The light transmittance Tt was calculated based on the following formula. Light transmittance Tt=(outgoing light / incoming light)×100%

[0053] [Table 1]

[0054] [Consideration of measurement results] According to Examples 1 to 6, with specific materials and parameters, the composite transparent plates exhibited good molding conditions, with haze values ​​of 0.75% to 2.85% and light transmittances of 87.5% to 91.5%.

[0055] In Example 5 and Comparative Example 1, the composite transparent plate in Comparative Example 1 contained only a single first layer, and the first resin component was Tairilin 663G. The resin had a relatively low intrinsic viscosity of 0.63 (dl / g), which resulted in poor molding. During molding, the resin dripped, making it impossible to mold into a plate, or significant bubbles were generated. In Example 5, the composite transparent plate could be processed normally because the layers B and C were sandwiched between resins with high intrinsic viscosity.

[0056] In Example 1 and Comparative Example 2, the composite transparent plate in Comparative Example 2 contained only one layer, and the first resin component was Tairilin 3760. When processed to a thickness of 4 mm, crystalline whitening occurred, and the composite transparent plate's haze value was too high and its light transmittance was too low, failing to meet the physical property requirements of a composite transparent plate. Example 1 was processed to a five-layer structure, with the first resin component being Tairilin 3824, the second resin component being Tairilin 3760, and the third resin component being Tairilin 3760. When processed to a thickness of 6 mm, no crystalline whitening occurred, and the transparent composite plate's haze value was 2.85% and its light transmittance was 88%, meeting the physical property requirements of a transparent composite plate.

[0057] [Advantageous Effects of the Embodiments] An advantageous effect of the present invention is that the composite transparent plate and manufacturing method thereof according to the present invention have the technical feature that "the first resin is selected from the group consisting of Tairilin 3824, Tairilin 3842, Tairilin 390A, Tairilin P115, Tairilin 663G and SKYGREEN® S2008, the second resin is selected from the group consisting of Tairilin 3760 and Tairilin 3842, and the third resin is selected from the group consisting of Tairilin 3760, Tairilin 3842, Tairilin 380R and Tairilin 384R," thereby solving the problem of crystalline whitening occurring easily when molding conventional transparent plates.

[0058] The above disclosure is merely a preferred embodiment of the present invention, and the scope of the claims of the present invention is not limited thereto. Therefore, all equivalent technical modifications made by utilizing the contents of the specification and drawings of the present invention are included in the scope of the claims of the present invention. [Explanation of symbols]

[0059] 100...Composite transparent plate A...1st layer B...Second layer C...Third layer S110...Supply process S120...molding process

Claims

1. a supplying step of feeding a first resin, a second resin, and a third resin into a first extruder, a second extruder, and a third extruder, respectively, to form a composite transparent film including corresponding first layers, second layers, and third layers; a molding step of passing the composite transparent film through a first molding wheel, a second molding wheel, and a third molding wheel in sequence to form a composite transparent plate; the first resin is a copolyester formed by copolymerization of an alcohol selected from at least one of the group consisting of ethylene glycol, propylene glycol, and 1,4-cyclohexanedimethanol and an acid selected from at least one of the group consisting of isophthalic acid, terephthalic acid, and 2,6-naphthalenedicarboxylic acid; the second resin is polyethylene terephthalate or a modified polyester composition; the third resin is polyethylene terephthalate or a modified polyester composition; an absolute value of a difference between the temperature of the first forming wheel and the temperature of the second forming wheel is 5°C or less, and a ratio of the temperature of the third forming wheel to the temperature of the first forming wheel or the temperature of the second forming wheel (temperature of the third forming wheel / first forming wheel, or temperature of the third forming wheel / second forming wheel) is 1.8 to 3.5; The composite transparent plate has a haze value of 0.75% to 4% and a light transmittance of 86% to 91.5%; A method for manufacturing a composite transparent plate, characterized in that the intrinsic viscosity of the first resin is 0.63 dl / g to 1.1 dl / g, the intrinsic viscosity of the second resin is 0.76 dl / g to 1.1 dl / g, and the intrinsic viscosity of the third resin is 0.76 dl / g to 1.1 dl / g.

2. The first resin contains diol residues and dicarboxylic acid residues, and, relative to the total amount of the dicarboxylic acid residues being 100 mol%, the content of terephthalic acid residues is 70 mol% to 99 mol%, the content of isophthalic acid residues is 1 mol% to 30 mol%, and the content of 2,6-naphthalenedicarboxylic acid residues is 0 mol% to 30 mol%, relative to the total amount of the diol residues being 100 mol%, the content of ethylene glycol residues is 50 mol% to 100 mol%, the content of propylene glycol residues is 0 mol% to 50 mol%, and the content of cyclohexanedimethanol residues is 0 mol% to 50 mol%. A method for producing a composite transparent plate as described in claim 1.

3. 2. The method for manufacturing a composite transparent plate according to claim 1, wherein the temperature of the first forming wheel is 18°C ​​to 25°C, the temperature of the second forming wheel is 18°C ​​to 25°C, and the temperature of the third forming wheel is 35°C to 58°C.

4. 2. The method for manufacturing a composite transparent plate according to claim 1, wherein the first layer, the second layer, and the third layer in the composite transparent plate are arranged as follows: third layer / second layer / first layer / second layer / third layer, third layer / second layer / first layer / second layer, third layer / second layer / first layer / third layer, or third layer / second layer / first layer.

5. 2. The method for manufacturing a composite transparent plate according to claim 1, wherein the thickness of the first layer accounts for 40% to 70%, the thickness of the second layer accounts for 15% to 40%, and the thickness of the third layer accounts for 10% to 20%, of the thickness of the composite transparent plate being 100%.

6. the first resin has a melting point of less than 246°C or no melting point; The melting point of the second resin is 246°C to 255°C, The method for manufacturing a composite transparent plate according to claim 1, wherein the melting point of the third resin is 246°C to 255°C.

7. The method for manufacturing a composite transparent plate according to claim 1, wherein the thickness of the composite transparent plate is 0.5 mm to 8 mm.

8. A composite transparent plate including a first layer formed of a first resin, a second layer formed of a second resin, and a third layer formed of a third resin, the first resin is a copolyester formed by copolymerization of an alcohol selected from at least one of the group consisting of ethylene glycol, propylene glycol, and 1,4-cyclohexanedimethanol and an acid selected from at least one of the group consisting of isophthalic acid, terephthalic acid, and 2,6-naphthalenedicarboxylic acid; the second resin is polyethylene terephthalate or a modified polyester composition; the third resin is polyethylene terephthalate or a modified polyester composition; The composite transparent plate has a haze value of 0.75% to 4% and a light transmittance of 86% to 91.5%; A composite transparent plate, characterized in that the intrinsic viscosity of the first resin is 0.63 dl / g to 1.1 dl / g, the intrinsic viscosity of the second resin is 0.76 dl / g to 1.1 dl / g, and the intrinsic viscosity of the third resin is 0.76 dl / g to 1.1 dl / g.

9. The first resin contains diol residues and dicarboxylic acid residues, and, relative to the total amount of the dicarboxylic acid residues being 100 mol%, the content of terephthalic acid residues is 70 mol% to 99 mol%, the content of isophthalic acid residues is 1 mol% to 30 mol%, and the content of 2,6-naphthalenedicarboxylic acid residues is 0 mol% to 30 mol%, relative to the total amount of the diol residues being 100 mol%, the content of ethylene glycol residues is 50 mol% to 100 mol%, the content of propylene glycol residues is 0 mol% to 50 mol%, and the content of cyclohexanedimethanol residues is 0 mol% to 50 mol%. The composite transparent plate of claim 8.

10. 9. The composite transparent plate of claim 8, wherein the first layer, the second layer, and the third layer in the composite transparent plate are arranged as follows: third layer / second layer / first layer / second layer / third layer, third layer / second layer / first layer / second layer, third layer / second layer / first layer / third layer, or third layer / second layer / first layer.

11. The composite transparent plate of claim 8, wherein the thickness of the first layer accounts for 40% to 70%, the thickness of the second layer accounts for 15% to 40%, and the thickness of the third layer accounts for 10% to 20%, of the thickness of the composite transparent plate being 100%.

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