WO2022239833A1 - 湾曲ガラス板の製造方法及び車両用合わせガラス - Google Patents

湾曲ガラス板の製造方法及び車両用合わせガラス Download PDF

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WO2022239833A1
WO2022239833A1 PCT/JP2022/020061 JP2022020061W WO2022239833A1 WO 2022239833 A1 WO2022239833 A1 WO 2022239833A1 JP 2022020061 W JP2022020061 W JP 2022020061W WO 2022239833 A1 WO2022239833 A1 WO 2022239833A1
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Prior art keywords
glass
curved
flat glass
flat
curved glass
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PCT/JP2022/020061
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English (en)
French (fr)
Japanese (ja)
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隆宏 浅田
康平 枝村
裕紀 山北
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セントラル硝子株式会社
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Priority to JP2023521243A priority Critical patent/JPWO2022239833A1/ja
Publication of WO2022239833A1 publication Critical patent/WO2022239833A1/ja

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00—Re-forming shaped glass
    • C03B23/02—Re-forming glass sheets
    • C03B23/023—Re-forming glass sheets by bending
    • C03B23/03—Re-forming glass sheets by bending by press-bending between shaping moulds

Definitions

  • the present disclosure relates to a method for manufacturing a curved glass plate used for laminated glass for vehicles, and laminated glass for vehicles.
  • Laminated glass having an intermediate film between two glass plates is used for automobile windshields and the like in order to prevent the glass from shattering at the time of collision.
  • curved laminated glass it is necessary to manufacture two curved glass plates (curved glass plates).
  • One method of manufacturing a curved glass plate is a press method. In the press method, flat glass sheets are heated one by one and pressed in a softened state to bend the glass sheets.
  • Patent Document 1 of the two glass plates with different thicknesses, the glass plate that is heated faster (that is, the thinner glass plate) is cooled in a heating furnace, and the two glass plates are press-bent.
  • a method is described for controlling substantially the same temperature after processing is complete.
  • the press method generally uses a convex mold and a concave mold.
  • the convex mold is a mold having a convex shape and has a shape corresponding to the curved shape of the glass plate after molding.
  • the concave mold is a ring-shaped mold that presses only the peripheral edge of the glass plate against the convex mold.
  • a curved glass plate is formed by placing the convex mold on top and the concave mold on the bottom, and pressing the heated flat glass between the convex mold and the concave mold.
  • a small hole is provided in the convex mold, and the glass plate can be fixed so that the glass plate does not move during pressing by sucking with a vacuum pump or the like.
  • An object of the present disclosure is to provide a method for manufacturing a curved glass sheet that causes less distortion when it is made into laminated glass, and a laminated glass for vehicles that causes less distortion.
  • the convex mold and the glass plate do not come into direct contact.
  • the convex surface is provided with a metal cloth (also called mold cloth). Further, the glass sheet is conveyed from the heating furnace to the press molding machine by a roller conveyor or the like.
  • the present inventors found that the trace of the metal cloth transferred to the concave surface of the curved glass plate (the surface in contact with the metal cloth provided on the convex surface) during press molding is the value of the distortion of the laminated glass. The present inventors have found that this is the cause of the increase in , leading to the completion of the present disclosure. Although the traces of the metal cloth on the concave surface of the curved glass plate did not significantly increase the distortion of the single glass plate, it is considered that when laminated glass is used, it causes a large amount of distortion. In addition, the present inventors have found that when a roller conveyor is used to transport the glass sheets, the traces of the rollers transferred to the convex surface of the curved glass sheet by the weight of the glass sheets also cause distortion of the laminated glass. Found it.
  • a method for manufacturing a curved glass plate for use in laminated glass for vehicles comprising: (A) heating the flat glass in a heating furnace; A step (B) of conveying the flat glass heated in the step (A) to a press molding machine; a step (C) of bending the flat glass to form a curved glass sheet having a concave surface and a convex surface with the press molding machine; In the step (B), the surface of the flat glass is cooled by injecting a cooling substance.
  • a method for manufacturing a curved glass sheet ⁇ 2> The method for producing a curved glass sheet according to ⁇ 1>, wherein the cooling is performed by injecting the cooling substance onto the concave surface side surface of the flat glass, and the cooling substance is air.
  • step (B) the surface of the flat glass that will become the concave surface in the step (C) is cooled more strongly than the surface that will become the convex surface in the step (C) by injecting a cooling substance.
  • step (B) the surface of the flat glass which will be the convex surface in the step (C) is cooled more strongly than the surface of the flat glass which will be the concave surface in the step (C) by injecting a cooling substance.
  • the method for producing a curved glass plate according to ⁇ 1> the method for producing a curved glass plate according to ⁇ 1>.
  • ⁇ 5> The method for producing a curved glass sheet according to any one of ⁇ 1> to ⁇ 4>, wherein the cooling is performed by injecting air onto both surfaces of the flat glass.
  • ⁇ 6> The method for producing a curved glass sheet according to ⁇ 5>, wherein the air injection pressure onto the concave surface of the flat glass is greater than the air injection pressure onto the convex surface of the flat glass.
  • ⁇ 7> The method for producing a curved glass plate according to ⁇ 5>, wherein the air injection pressure to the convex surface of the flat glass is higher than the air injection pressure to the concave surface of the flat glass.
  • ⁇ 8> The method for manufacturing a curved glass sheet according to any one of ⁇ 1> to ⁇ 7>, wherein the cooling substance has a temperature of 200° C. or lower.
  • ⁇ 9> The method for producing a curved glass sheet according to any one of ⁇ 1> to ⁇ 7>, wherein the cooling substance has a temperature of 100° C. or less.
  • ⁇ 10> The method for manufacturing a curved glass sheet according to any one of ⁇ 1> to ⁇ 7>, wherein the cooling substance has a temperature of 50° C. or lower.
  • ⁇ 11> The method for manufacturing a curved glass plate according to any one of ⁇ 1> to ⁇ 10>, wherein the cooling lowers the temperature of the surface of the flat glass on the concave surface side by 5 to 15°C.
  • ⁇ 12> The method for producing a curved glass sheet according to any one of ⁇ 1> to ⁇ 11>, wherein the press molding machine has a convex mold, and a metal cloth is provided on the surface of the convex mold.
  • ⁇ 13> The method for producing a curved glass sheet according to any one of ⁇ 1> to ⁇ 12>, wherein the cooling is performed outside the heating furnace.
  • ⁇ 14> Two flat glass sheets, a first flat glass and a second flat glass, are used as the flat glass, a first curved glass sheet is produced from the first flat glass, and a second curved glass sheet is produced from the second flat glass.
  • a manufacturing method for manufacturing The method for producing a curved glass plate according to any one of ⁇ 1> to ⁇ 13>, wherein the cooling is performed on at least one of the first flat glass and the second flat glass.
  • ⁇ 15> The method for producing a curved glass plate according to ⁇ 14>, wherein the first flat glass and the second flat glass have the same thickness.
  • ⁇ 16> The method for producing a curved glass plate according to ⁇ 14>, wherein the first flat glass and the second flat glass have different thicknesses.
  • ⁇ 17> The method for producing a curved glass sheet according to ⁇ 14>, wherein the cooling is performed on both the first flat glass and the second flat glass.
  • the thickness of the first flat glass is thicker than the thickness of the second flat glass.
  • ⁇ 19> The method for producing a curved glass sheet according to ⁇ 18>, wherein the temperature of the heating furnace is equal to or higher than the temperature at which the second flat glass can be bent. ⁇ 20> ⁇ 18> or ⁇ 19>.
  • ⁇ 21> a first curved glass plate and a second curved glass plate facing each other;
  • a laminated glass for a vehicle comprising: an interlayer sandwiched between the first curved glass plate and the second curved glass plate, The laminated glass has a thickness of 5 mm or less, The perspective distortion in the test area A defined in JIS R3212 (2015) of the laminated glass is 1.5 minutes or less,
  • a laminated glass for a vehicle wherein the thickness of the first curved glass plate is ⁇ 1.1 times or less the thickness of the second curved glass plate.
  • ⁇ 22> The laminated glass for vehicles according to ⁇ 21>, wherein each of the first curved glass plate and the second curved glass plate has a see-through distortion in the test region A of 0.4 minutes or less.
  • ⁇ 23> a first curved glass plate and a second curved glass plate facing each other;
  • a laminated glass for a vehicle comprising: an interlayer sandwiched between the first curved glass plate and the second curved glass plate, The laminated glass has a thickness of 5 mm or less, The perspective distortion in the test area A defined in JIS R3212 (2015) of the laminated glass is 1.0 minutes or less, A laminated glass for a vehicle, wherein the thickness of the second curved glass plate is 0.8 times or less the thickness of the first curved glass plate.
  • FIG. 1(a) is a schematic diagram of an example of flat glass
  • FIG. 1(b) is a schematic diagram of an example of a curved glass plate. It is a schematic diagram for demonstrating an example of the manufacturing method of a curved glass plate. It is a schematic diagram for demonstrating an example of the manufacturing method of a curved glass plate.
  • the method for manufacturing a curved glass sheet of the present disclosure includes: A method for manufacturing a curved glass plate for use in laminated glass for vehicles, comprising: (A) heating the flat glass in a heating furnace; A step (B) of conveying the flat glass heated in the step (A) to a press molding machine; a step (C) of bending the flat glass to form a curved glass sheet having a concave surface and a convex surface with the press molding machine; In the step (B), the surface of the flat glass is cooled by injecting a cooling substance.
  • a method for manufacturing a curved glass plate comprising: (A) heating the flat glass in a heating furnace; A step (B) of conveying the flat glass heated in the step (A) to a press molding machine; a step (C) of bending the flat glass to form a curved glass sheet having a concave surface and a convex surface with the press molding machine; In the step (B), the surface of the flat glass is cooled by injecting a cooling substance
  • Step (A) is a step of heating flat glass in a heating furnace.
  • the flat glass is heated to a temperature at which it can be bent or higher (for example, 600 to 750° C.).
  • the temperature at which bending can be performed varies depending on the thickness and chemical composition of the flat glass, and can be set to a temperature suitable for the flat glass to be used.
  • a heating method in the heating furnace is not particularly limited, and a known heating method can be used.
  • the flat glass can be heated while being conveyed by a known method such as a roller conveyor.
  • flat glass The type of flat glass is not particularly limited, and known flat glass such as soda lime glass, aluminosilicate glass, borosilicate glass, alkali-free glass, quartz glass, physically strengthened glass, and chemically strengthened glass can be used. In particular, it is preferable to use soda lime silicate glass specified in ISO 16293-1:2008. Further, as a material of the flat glass, a coloring component such as iron or cobalt is appropriately adjusted as a component of the glass composition, and a material exhibiting a color tone of gray, green, blue, or the like can be used.
  • a coloring component such as iron or cobalt is appropriately adjusted as a component of the glass composition, and a material exhibiting a color tone of gray, green, blue, or the like can be used.
  • the thickness of the flat glass is not particularly limited, and can be, for example, 0.05 mm to 10 mm.
  • the thickness of the flat glass is preferably 0.5 mm to 4 mm, more preferably 1 mm to 3 mm.
  • Step (B) is a step of conveying the flat glass heated in step (A) to a press molding machine.
  • the flat glass can be conveyed from the heating furnace to the press molding machine by a known method such as a roller conveyor.
  • step (B) the surface of the flat glass is cooled by injecting a cooling substance.
  • the cooling substance is not particularly limited, and examples thereof include air and atomized water, but air is preferred.
  • the injection pressure of the cooling substance is not particularly limited, but can be, for example, 0.5 MPa or less, and may be 0.2 MPa to 0.5 MPa. Both the injection pressure of the cooling substance onto the surface of the flat glass to be concave in the step (C) and the injection pressure of the cooling substance to the surface of the flat glass to be convex in the step (C) are 0.2 MPa to 0. 0.5 MPa.
  • the injection pressure of the cooling substance onto the concave surface of the flat glass in the step (C) is 0.4 MPa to 0.5 MPa, and the injection pressure of the cooling substance onto the convex surface in the step (C) is It is preferably 0.0 MPa to 0.3 MPa.
  • cooling modes include the following three.
  • the aspect (iii) includes the following three aspects.
  • the surface on the concave side in step (C) is the surface of the flat glass that faces the convex mold of the press molding machine in step (C).
  • the surface that becomes a concave surface in the flat glass process (C) is also referred to as "S2 surface”.
  • the temperature of the glass surface layer portion of the S2 surface is lowered, and the traces of the metal cloth are less likely to be transferred. and the occurrence of distortion can be suppressed. It is preferable to lower the temperature of the S2 surface by 5 to 15°C by cooling in step (B). That is, the temperature of the S2 surface after cooling is preferably 5 to 15° C. lower than the temperature of the S2 surface before cooling.
  • the temperature of the glass surface layer portion of the S1 surface is reduced to This makes it difficult to transfer the traces of the roller, thereby suppressing the occurrence of distortion. It is preferable to lower the temperature of the S1 surface by 5 to 15°C by cooling in step (B). That is, the temperature of the S1 surface after cooling is preferably 5 to 15° C. lower than the temperature of the S1 surface before cooling.
  • the temperature of the S1 surface and the S2 surface is lowered by 5 to 15° C. by cooling in step (B). That is, the temperatures of the S1 and S2 surfaces after cooling are preferably 5 to 15° C. lower than the temperatures of the S1 and S2 surfaces before cooling.
  • the aspect (iii) when cooling substances with the same temperature are used, the higher the injection pressure, the stronger the cooling (that is, the greater the degree of temperature drop).
  • the aspect (iv) is particularly preferable.
  • Fig. 1(a) shows a schematic diagram (a cross-sectional schematic diagram in the thickness direction) of an example of flat glass
  • Fig. 1(b) shows a schematic diagram of an example of a curved glass plate.
  • the cooling in step (B) is preferably performed by injecting air.
  • a method for injecting air is not particularly limited, and a known method can be used. For example, it is possible to adopt a method of supplying air to a tubular member provided with injection holes at predetermined intervals and injecting the air from the injection holes onto the glass plate. Also, in order to increase the cooling power, water may be sprayed in the form of a mist at the same time as the air is sprayed.
  • the temperature of the injected air is preferably 200° C. or lower, more preferably 100° C. or lower, and even more preferably 50° C. or lower.
  • Cooling in step (B) is preferably performed outside the heating furnace. By cooling outside the heating furnace, the temperature of the glass sheet can be easily lowered and more accurate control becomes possible. This makes it possible to more effectively suppress the occurrence of distortion in the laminated glass.
  • Step (C) is a step of bending flat glass to form a curved glass sheet having concave and convex surfaces using a press molding machine.
  • the press molding machine has a convex mold and a metal cloth (mold cloth) on the surface of the convex mold.
  • the convex mold is provided with a hole for sucking and fixing the glass plate during pressing.
  • the press molding machine preferably further has a concave mold (ring-shaped mold) facing the convex mold.
  • the concave mold Since the concave mold has a ring-shaped structure and supports only the peripheral edge of the glass plate, the area other than the glass plate peripheral edge with which the concave mold contacts does not come into contact with the concave mold.
  • a convex mold is used as an upper mold and a concave mold is used as a lower mold. By raising the concave mold and pressing the glass plate against the convex mold, the glass plate can be bent.
  • the press molding machine, convex mold, concave mold, and metal cloth are not particularly limited, and a known press molding machine, convex mold, concave mold, and metal cloth used for bending glass sheets can be used.
  • the press molding machine may be integrated with the heating furnace described above, or may be installed separately downstream of the heating furnace.
  • heating in the heating furnace in step (A) and heating in step (B) can also be carried out continuously.
  • two or more sheets of flat glass can be continuously heated and shaped.
  • a preferred embodiment of the method for manufacturing a curved glass sheet of the present disclosure includes: Manufacture of using two flat glass sheets, the first flat glass and the second flat glass, as the flat glass, manufacturing the first curved glass sheet from the first flat glass, and manufacturing the second curved glass sheet from the second flat glass a method, A method for manufacturing a curved glass sheet, wherein at least one of the first flat glass and the second flat glass is cooled in the step (B) described above.
  • a particularly preferred embodiment of the method for manufacturing a curved glass sheet of the present disclosure is A method for manufacturing a curved glass plate for use in laminated glass for vehicles, comprising: a step (A) of heating the first flat glass and the second flat glass in a heating furnace; a step (B) of conveying the first flat glass and the second flat glass heated in step (A) to a press molding machine; a step (C) of bending the first flat glass and the second flat glass with a press molding machine to form a first curved glass plate and a second curved glass plate having a concave surface and a convex surface; In the step (B), for at least one of the first flat glass and the second flat glass, the surface on the side that becomes the concave surface in the step (C) and the surface on the side that becomes the convex surface in the step (C) cooling more intensely, A method for manufacturing a curved glass plate.
  • the thickness of the first flat glass and the second flat glass may be the same or different.
  • the cooling in step (B) may be performed on either one of the first flat glass and the second flat glass, or may be performed on both the first flat glass and the second flat glass.
  • the thickness of the first flat glass is thicker than the thickness of the second flat glass, it is preferable to perform the cooling in step (B) only on the first flat glass.
  • thin glass sheets are more difficult to mold than thick glass sheets because, for example, wrinkles are more likely to occur in the outer periphery. Therefore, when molding a thin glass plate, it is necessary to mold at a higher temperature than when molding a thick glass plate.
  • the thickness of the first flat glass is thicker than the thickness of the second flat glass (that is, when the first flat glass is thick and the second flat glass is thin)
  • the heating temperature Since it is not usually performed to change the setting of , the first flat glass and the second flat glass are heated to approximately the same temperature.
  • the thicker first flat glass must be heated to a temperature higher than the temperature at which it can be bent. is heated up to
  • the higher the heating temperature the more likely the metal cloth will mark during pressing. Therefore, when the thickness of the first flat glass is thicker than the thickness of the second flat glass, the cooling in step (B) is performed only on the first flat glass so that the temperature is higher than the temperature at which bending is possible.
  • the thickness of each flat glass is not particularly limited.
  • the thickness of the first flat glass is 2.0 to 2.3 mm.
  • the thickness of the second flat glass is 1.6 to 1.8 mm.
  • the temperature of the heating furnace is preferably at least the temperature at which the second flat glass can be bent.
  • the temperature of the concave surface (S2 surface) of the first flat glass is lowered by the cooling in the step (B) to the second flat glass. It is preferably 1 to 10° C. lower than the temperature of the concave surface (S2 surface) of the glass.
  • a laminated glass for a vehicle of the present disclosure includes a first curved glass plate, a second curved glass plate, and an interlayer sandwiched between the first curved glass plate and the second curved glass plate, which face each other. Prepare.
  • the thickness of the laminated glass is preferably 5 mm or less, more preferably 4 mm or less.
  • the thickness of the first curved glass plate is preferably ⁇ 1.1 times or less of the thickness of the second curved glass plate. It is preferable that the perspective distortion in the test area A defined in JIS R3212 (2015) for laminated glass is 1.5 minutes or less. The perspective distortion in the test area A of the first curved glass plate and the second curved glass plate is preferably 0.4 minutes or less, respectively.
  • the laminated glass for a vehicle of the present disclosure is sandwiched between a first curved glass plate, a second curved glass plate, and a first curved glass plate and a second curved glass plate, which face each other. and an interlayer film, wherein the thickness of the laminated glass (total thickness of the first curved glass plate, the interlayer film, and the second curved glass plate) is 5 mm or less, and The perspective distortion in the test area A defined in JIS R3212 (2015) for laminated glass is 1.0 minutes or less, and the thickness of the second curved glass plate is 0.00% of the thickness of the first curved glass plate. It is also preferable to be a laminated glass for vehicles, which is 8 times or less.
  • the thickness of the glass sheets constituting the laminated glass for a vehicle of the present disclosure is constant.
  • the perspective distortion in the test area A of the first curved glass plate and the second curved glass plate is preferably 0.2 minutes or less, respectively.
  • a first flat glass with a glass size of 1370 mm ⁇ 1049 mm and a thickness of 2.0 mm and a second flat glass with a thickness of 2.0 mm curved glass sheets are produced from each flat glass, and these curved glass sheets are manufactured.
  • a laminated glass was produced using this.
  • a curved glass sheet was manufactured by a curved glass sheet manufacturing method using the heating furnace 2, the cooling device 3, and the press molding machine 4 shown in FIG.
  • a cooling device 3 is provided outside the heating furnace 2 and between the heating furnace 2 and the press molding machine 4 .
  • the glass sheet is conveyed by a roller conveyor 5 into the heating furnace 2 and from the heating furnace 2 to the press molding machine 4 .
  • the press molding machine 4 has a convex mold 6 and a concave mold 7 (ring-shaped mold) as molding dies, and has a metal cloth 8 on the surface of the convex mold 6 .
  • a first flat glass with a thickness of 2.0 mm and a second flat glass with a thickness of 2.0 mm were heated while flowing separately in a heating furnace at 648°C.
  • normal temperature 23 ° C.
  • the strain of each curved glass plate was measured. Specifically, based on JIS R3212 (2015), perspective distortion of test areas A and B was measured at an actual vehicle mounting angle of 28.4 degrees. After that, a polyvinyl butyral (PVB) intermediate film having a thickness of 0.76 mm was placed between the two curved glass plates to produce a laminated glass, and the strain was measured in the same manner as described above. The results are shown in Table 1 below. Table 1 shows the perspective strain (in minutes) for each test area. A smaller perspective distortion value is preferable because the distortion is less.
  • PVB polyvinyl butyral
  • Example 1 A curved glass plate was formed in the same manner as in Example 1, except that the flat glass was not cooled after coming out of the heating furnace.
  • the surface temperature of the S2 surface of each flat glass was measured before entering the press molding machine, the surface temperature of the S2 surface in the central portion of each flat glass was 626°C.
  • laminated glass was produced in the same manner as in Example 1, and the distortion of each curved glass plate and laminated glass was measured. The results are shown in Table 2 below.
  • Example 2 Using a first flat glass having a glass size of 1401 mm ⁇ 723 mm and a thickness of 2.0 mm and a second flat glass having a thickness of 1.6 mm, a curved glass sheet is produced from each flat glass, and these curved glass sheets are manufactured. A laminated glass with different thickness was manufactured using this method. Specifically, similarly to Example 1, a curved glass plate was manufactured by the curved glass plate manufacturing method including the heating furnace, the cooling device, and the press molding machine shown in FIG. A first flat glass with a thickness of 2.0 mm and a second flat glass with a thickness of 1.6 mm were heated while flowing separately in a heating furnace at 648°C.
  • the concave surface (S2 surface) of the curved glass plate of the first flat glass is cooled and blown.
  • the first flat glass was cooled by blowing air at normal temperature (23° C.).
  • the second flat glass having a thickness of 1.6 mm was not cooled after leaving the heating furnace.
  • the surface temperature of the S2 surface of each flat glass was measured before entering the press molding machine, the surface temperature of the S2 surface near the center of the 1.6 mm thick second flat glass was 625 ° C.
  • the surface temperature of the S2 surface near the center of the 2.0 mm first flat glass was 620°C, and a temperature difference of 5°C could be produced.
  • Example 2 A curved glass plate was formed in the same manner as in Example 2, except that the first flat glass having a thickness of 2.0 mm was not cooled after coming out of the heating furnace. That is, in Comparative Example 2, neither the first flat glass having a thickness of 2.0 mm nor the second flat glass having a thickness of 1.6 mm was cooled.
  • the surface temperature of the S2 surface of each flat glass before entering the press molding machine was measured, the surface of the S2 surface near the center of the first flat glass with a thickness of 2.0 mm and the second flat glass with a thickness of 1.6 mm All the temperatures were 625° C., and there was no temperature difference. Thereafter, laminated glass was produced in the same manner as in Example 2, and the distortion of each curved glass plate and laminated glass was measured. The results are shown in Table 4 below.
  • Example 2 Comparing Example 2 and Comparative Example 2, it can be seen that perspective distortion is improved in Example 2 compared to Comparative Example 2 in each region when laminated glass is used.
  • Example 3 Using a first flat glass with a glass size of 1370 mm ⁇ 1049 mm and a thickness of 2.0 mm and a second flat glass with a thickness of 2.0 mm, curved glass sheets are produced from each flat glass, and these curved glass sheets are manufactured.
  • a laminated glass was produced using Specifically, a curved glass sheet was manufactured by a curved glass sheet manufacturing method including the heating furnace 2, the cooling devices 3 and 10, and the press molding machine 4 shown in FIG.
  • the manufacturing method of the curved glass sheet shown in FIG. 3 is the same as the manufacturing method of the curved glass sheet of FIG.
  • a cooling device 10 is provided outside the heating furnace 2 and between the heating furnace 2 and the press molding machine 4 .
  • the cooling device 10 can cool the S1 surface.
  • a first flat glass with a thickness of 2.0 mm and a second flat glass with a thickness of 2.0 mm were heated while flowing separately in a heating furnace at 653°C.
  • the concave surface (S2 surface) and the convex surface of the curved glass plate of each flat glass are cooled and blown. Air at room temperature (23° C.) was blown onto (S1 surface) to cool the flat glass.
  • the surface temperature of the S2 surface of each flat glass before entering the press molding machine was measured with a thermometer 9, the surface temperature of the S2 surface near the center of each flat glass was 626°C.
  • Comparative Example 3 which will be described later, the surface temperature of the S2 surface was 631°C when cooling was not performed. I understand. Thereafter, bending was performed using a press molding machine in which the temperature of the mold was set to 450° C. to produce a first curved glass plate with a thickness of 2.0 mm and a second curved glass plate with a thickness of 2.0 mm. An intermediate film made of polyvinyl butyral (PVB) and having a thickness of 0.76 mm was arranged between the manufactured first curved glass plate and the second curved glass plate to manufacture a laminated glass.
  • PVB polyvinyl butyral
  • the distortion of the laminated glass was measured. Specifically, based on JIS R3212 (2015), perspective distortion of test areas A and B was measured at an actual vehicle mounting angle of 28.4 degrees. Table 5 below shows the measurement results for three samples prepared under the same conditions. Table 5 shows the perspective strain (in minutes) for each test area. A smaller perspective distortion value is preferable because the distortion is less.
  • Example 3 A curved glass plate was formed in the same manner as in Example 3, except that the flat glass was not cooled after coming out of the heating furnace.
  • the surface temperature of the S2 surface of each flat glass was measured before entering the press molding machine, the surface temperature of the S2 surface in the central portion of each flat glass was 631°C.
  • a laminated glass was produced, and the distortion of the laminated glass was measured. Table 6 below shows the measurement results for three samples prepared under the same conditions.
  • Example 3 Comparing Example 3 and Comparative Example 3, it can be seen that perspective distortion is improved in Example 3 compared to Comparative Example 3 in each region when laminated glass is used.
  • the method for manufacturing a curved glass sheet of the present disclosure can manufacture a curved glass sheet with little distortion when laminated glass, and can provide laminated glass with particularly little distortion.

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PCT/JP2022/020061 2021-05-12 2022-05-12 湾曲ガラス板の製造方法及び車両用合わせガラス WO2022239833A1 (ja)

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JPS61132529A (ja) * 1984-11-23 1986-06-20 グラステク　インコーポレーテツド ガラス板を成形するための方法と装置
JP2006523173A (ja) * 2003-03-28 2006-10-12 ピルキントン オートモーティヴ ドイチェラント ゲーエムベーハー 非対称板ガラス対の板ガラスの処理方法及びそのための装置
JP2007533592A (ja) * 2004-04-21 2007-11-22 ピーピージー・インダストリーズ・オハイオ・インコーポレイテッド 真空装置を用いるシート曲げ装置及びその方法
JP2018158883A (ja) * 2015-01-26 2018-10-11 Ａｇｃ株式会社 合わせガラス
JP2020521715A (ja) * 2017-06-01 2020-07-27 ピルキントン グループ リミテッド ガラスシートの成形方法および装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61132529A (ja) * 1984-11-23 1986-06-20 グラステク　インコーポレーテツド ガラス板を成形するための方法と装置
JP2006523173A (ja) * 2003-03-28 2006-10-12 ピルキントン オートモーティヴ ドイチェラント ゲーエムベーハー 非対称板ガラス対の板ガラスの処理方法及びそのための装置
JP2007533592A (ja) * 2004-04-21 2007-11-22 ピーピージー・インダストリーズ・オハイオ・インコーポレイテッド 真空装置を用いるシート曲げ装置及びその方法
JP2018158883A (ja) * 2015-01-26 2018-10-11 Ａｇｃ株式会社 合わせガラス
JP2020521715A (ja) * 2017-06-01 2020-07-27 ピルキントン グループ リミテッド ガラスシートの成形方法および装置

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