KR20180080473A - Manufacturing method for curved lamination glass and curved lamination glass manufactured by the same - Google Patents

Abstract

According to one embodiment of the present invention, provided is a method of manufacturing a bent laminated glass. The method comprises the steps of: preparing a plate-shaped supporting glass and a plate-shaped first glass; laminating the plate-shaped first glass on an upper side of the plate-shaped supporting glass; heating the laminated plate-shaped supporting glass and the plate-shaped first glass, and allowing the plate-shaped supporting glass and the plate-shaped first glass to be bent by their own weights; and bonding the bent supporting glass or the plate-shaped second glass on one side of the bent first glass, wherein the supporting glass has higher softening point and annealing point than those of the first glass.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of manufacturing a curved laminated glass, and a curved laminated glass produced by the method.

The present invention relates to a method of manufacturing a curved laminated glass and a curved laminated glass produced thereby.

The laminated glass comprising a plurality of glass sheets bonded together can be applied to a window of a building, a window of a transportation means such as an automobile, a railroad, and an airplane. The laminated glass can be produced by bonding clear glass tinted glass or a transparent material exhibiting similar performance and bonding the glass or the like using a polyvinyl butyral (PVB) copolymer film or the like .

Particularly, in the case of manufacturing a bonded glass by processing it into a curved surface rather than a flat surface, two methods of self-weighting and compression molding are generally used as a method of imparting a curvature to the glass. Self-weight molding is a molding method in which a molding frame for fixing the rim of a glass is used and the glass is sagged by the self-weight of the glass by raising the temperature to the vicinity of the softening point of the glass to be molded. On the other hand, the compression molding is a method in which the glass to be formed is sufficiently heated and pressed by a mold having a predetermined shape.

There is a problem that the productivity and efficiency of the curved joint glass deteriorate because the compression molding requires the glass to be formed by replacing the pressing mold in accordance with the shape of the desired glass after molding. On the other hand, self-weight molding has a limitation in that a pair of glass to be bonded must be formed at the same time to produce a bonded glass, and so-called folding phenomenon occurs in which the curvature becomes larger than necessary only in the central portion of the glass to be formed in self- there is a problem. It has a disadvantage that it is difficult to apply to functional products requiring high optical quality because it causes optical quality deterioration due to distortion of image.

The present invention relates to a method of manufacturing a curved laminated glass and a curved laminated glass produced thereby. The present invention relates to a method of manufacturing a curved laminated glass capable of accurately manufacturing a curved laminated glass having desired curvature and simplifying the manufacturing process.

According to an embodiment of the present invention, there is provided a method of manufacturing a glass plate, comprising: preparing a plate-like support glass and a plate-like first glass; Laminating the plate-like first glass on the upper surface of the plate-like support glass; Heating the laminated support glass plate and the first glass plate to heat the first support glass plate and the plate-like first glass by their own weight; And bonding the curved support glass or the plate-shaped second glass on one side of the curved first glass, wherein the support glass has a higher softening point and a standing cold point than the first glass There is provided a method of manufacturing a curved laminated glass.

According to another embodiment of the present invention, there is provided a curved laminated glass produced by the method of manufacturing a curved laminated glass according to an embodiment of the present invention.

In the method of manufacturing a curved laminated glass according to an embodiment of the present invention, the support glass laminated on the lower surface of the first glass supports the first glass in the course of processing the first glass into a curved surface, It is possible to prevent occurrence of a folding phenomenon that is machined to be curved beyond a desired curvature.

The method of manufacturing a curved laminated glass according to an embodiment of the present invention can simplify the manufacturing process by elastically deforming the second glass or the supporting glass included in the bonded glass into a curved surface in the process of bonding the second glass or the supporting glass to the first glass, The manufacturing cost and manufacturing time of the bonded glass can be shortened.

The curved laminated glass according to another embodiment of the present invention can attain light weight, and can have an advantage of excellent abrasion resistance and durability.

1 is a view schematically showing a step of curving a surface according to an embodiment of the present invention.
2 is a schematic view illustrating a process of manufacturing a curved glass according to a conventional method.
3 is a view illustrating a process of bonding one surface of a second glass according to an embodiment of the present invention to a concave surface of a curved first glass.
4 is a view illustrating a process of bonding one surface of a second glass according to an embodiment of the present invention to a convex surface of a first glass processed into a curved surface.
FIG. 5 is a graph showing the results of securing rigidity according to a thickness ratio between a first glass and a second glass according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

The terms used in this specification will be briefly described, and the present invention will be described in detail.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. Also, in certain cases, there may be a term selected arbitrarily by the applicant, in which case the meaning thereof will be described in detail in the description of the corresponding invention. Therefore, the term used in the present invention should be defined based on the meaning of the term, not on the name of a simple term, but on the entire contents of the present invention.

When an element is referred to as "including" an element throughout the specification, it is to be understood that the element may include other elements as well, without departing from the spirit or scope of the present invention. Further, when a member is referred to herein as being "on " another member, this includes not only when a member is in contact with another member but also when there is another member between the two members.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a view schematically showing a step of curving a surface according to an embodiment of the present invention.

According to an embodiment of the present invention, there is provided a method of manufacturing a glass plate, comprising: preparing a plate-like supporting glass 300 and a plate-like first glass 100; Stacking the plate-like first glass (100) on the upper surface of the plate-like support glass (300); Heating the laminated support glass 300 and the first glass plate 100 to curved the support glass 300 and the first glass plate 100 by their own weights; And bonding the curved support glass 300 or the plate-shaped second glass 200 on one side of the curved first glass 100, Wherein the first glass (100) has a higher softening point and a standing cold point than the first glass (100).

According to an embodiment of the present invention, the support glass 300 stacked on the lower surface of the first glass 100 supports the first glass 100 in the process of curving the first glass 100, 1, it is possible to prevent the occurrence of embossing phenomenon in the central portion of the glass 100 that is curved beyond the desired curvature.

2 is a view schematically showing a process of manufacturing a curved laminated glass according to a conventional method.

Referring to FIG. 2, in the conventional method of manufacturing a curved glass sheet, two glass sheets are laminated and placed in a mold, heated to a temperature near the softening point of the glass, and processed into a curved surface through the weight of the glass. However, when the properties of the two sheets of glass used in the laminated glass are similar, there is a problem in that during the process of curving the glass by heating it, a folding phenomenon occurs in which the curved surface is processed at a desired curvature or more at the central portion of the glass. Further, in the case of producing a curved laminated glass using two sheets of glass having different physical properties, there is a problem that it is difficult to provide a curved laminated glass which is precisely bonded because the two sheets of glass have different physical properties and can not be curved with the same curvature.

According to an embodiment of the present invention, the plate-like first glass 100 is laminated on the upper surface of the supporting glass 300 having a higher softening point and a standing point than the first glass 100, The support glass 300 supports the first glass 100 in a process of heating the glass 100 and the support glass 300 to be curved so that the first glass 100 supports the glass 100, Can be effectively suppressed.

According to an embodiment of the present invention, the curving step may be heated to a softening point temperature or higher than a softening point temperature of the first glass.

Referring to FIG. 1, the plate-like first glass 100 is laminated on the upper surface of the plate-like support glass 300. According to one embodiment of the present invention, in order to process the first glass 100 and the supporting glass 300 into a curved surface by their own weight, a plate-like supporting glass 300 And the first glass plate 100 is laminated on the upper surface of the support glass 300. Then, the first glass 100 and the supporting glass 300 are heated to form a curved surface.

When the first glass 100 and the supporting glass 300 are heated to a temperature between the standing-up temperature of the first glass 100 and the softening point temperature, the supporting glass 300 is heated to a temperature lower than the softening point of the first glass 100 And the temperature of the support glass 300 does not reach the softening point of the support glass 300 because it has a high softening point. Accordingly, the supporting glass 300 is not completely melted in the process of being processed into a curved surface, but is slightly deformed by its own weight and the strength of the supporting glass 300 is maintained at a certain level or more. Accordingly, the supporting glass 300 effectively suppresses the occurrence of embossing that may occur during the process of forming the curved surface of the first glass 100 by effectively supporting the first glass 100. On the other hand, as the temperature of the first glass 100 reaches the vicinity of the softening point of the first glass 100, the first glass 100 is melted and supported by the supporting glass 300, It can be processed into a curved surface. That is, the first glass 100 can be processed into a curved surface having the same curvature as that of the support glass 300 which is slightly deformed.

According to an embodiment of the present invention, the degree of curving of the first glass 100 and the supporting glass 300 can be controlled by adjusting the heating temperature in the curving step. Specifically, the first glass 100 and the supporting glass 300 may be heated to a softening point temperature or higher than a softening point temperature of the first glass 100 in the curving step. When the support glass 300 and the first glass 100 are heated to a temperature close to the softening point of the first glass 100, the support glass 300 is melted and has a larger curvature due to its own weight, Lt; / RTI > That is, since the first glass 100 can be processed to have the same curvature as the curvature of the supporting glass 300, the curvature of the supporting glass 300 can be controlled by adjusting the temperature condition applied in the curving step, So that the extent to which the first glass 100 is processed on the curved surface can be controlled.

In order to effectively prevent the supporting glass 300 from supporting the first glass 100 during the course of processing the first glass 100 and the supporting glass 300 into curved surfaces, The curved surface processing may preferably heat the first glass 100 and the supporting glass 300 to a temperature below the softening point temperature of the first glass 100.

Therefore, the method of manufacturing a curved glass according to an embodiment of the present invention can easily and easily process the first glass 100 into a curved glass having a desired curvature, And has the advantage of suppressing the callous phenomenon.

In addition, the curving step according to an embodiment of the present invention may heat the first glass 100 and the supporting glass 300 using hot air or hot wire. After the first glass 100 is laminated on the upper surface of the support glass 300 and the laminated glass is placed on the molding frame, hot air or hot wire is used as the glass from the upper surface side of the first glass 100 And the heat can be applied to the upper surface of the first glass 100 and the upper surface of the supporting glass 300. [ Heat can be applied at the same time using hot wind or hot wire at the bottom side

In the curved surface processing step according to the embodiment of the present invention, the supporting glass 300 and the first glass 100 are heated, curved, and then slowly cooled to complete curved surface processing. Since the first glass 100 has a cold point lower than that of the support glass 300, the support glass 300 can be cooled faster than the first glass 100 during the slow cooling process. In addition, since the support glass 300 has a higher stand-by temperature than the first glass 100, deformation of the support glass 300 due to heat can be minimized.

Referring to FIG. 1, as the supporting points of the supporting glass 300 and the first glass 100 are different from each other, the supporting glass 300 and the first glass 100 are gradually cooled, 300 may have a curvature different from that of the first glass 100 and may be completed. However, according to the embodiment of the present invention, since the supporting glass 300 can be elastically deformed and bonded on one surface of the first glass 100, it is possible to provide a curved glass laminated with excellent bonding quality have.

According to an embodiment of the present invention, the temperature ratio of the softening point of the support glass 300 to the first glass 100 may be 1: 0.7 to 1: 0.9. Specifically, the temperature ratio of the softening point of the support glass 300 to the softening point of the first glass 100 may be 1: 0.7 to 1: 0.8, 1: 0.75 to 1: 0.78.

By adjusting the temperature ratio of the softening point of the support glass 300 and the softening point of the first glass 100 to 1: 0.9 or less, the support glass 300 is excessively melted near the softening point of the first glass 100 So that the supporting glass 300 can effectively support the first glass 100 during the curving process of the first glass 100. By adjusting the temperature ratio of the softening point of the support glass 300 to the softening point of the first glass 100 to 1: 0.7 or more, The first glass 100 is curved to a desired curvature while the supporting glass 300 supports the central portion of the first glass 100 to cause a folding phenomenon Can be suppressed.

According to an embodiment of the present invention, the temperature ratio between the support glass 300 and the standing point of the first glass 100 may be 1: 0.7 to 1: 0.9. Specifically, the temperature ratio of the standing glass 300 and the first glass 100 may be 1: 0.7 to 1: 0.8, 1: 0.73 to 1: 0.77.

When the temperature ratio between the support glass 300 and the standing point of the first glass 100 is less than 1: 0.7, the support glass 300 is not smoothly deformed by heat, It is difficult to process the glass into a curved glass having a radius of curvature. If the temperature ratio of the support glass 300 to the frost point of the first glass 100 is more than 1: 0.9, the support glass is excessively deformed by heat and can not effectively support the first glass May occur.

The support glass 300 according to an embodiment of the present invention may have a softening point of 900 ° C or higher and 1000 ° C or lower, and a cold point of 680 ° C or higher and 770 ° C or lower. The softening point of the first glass 100 may be 680 ° C or higher and 780 ° C or lower, and the cold point may be 500 ° C or higher and 600 ° C or lower.

According to an embodiment of the present invention, the support glass 300 may have a higher viscosity than the first glass 100. Specifically, the support glass 300 may have a higher viscosity than the first glass 100 within a temperature range between the stand-by point of the first glass 100 and the softening point. For example, the viscosity (logη) of the first glass 100 is 10 dPa · s at 600 ° C., which is the temperature between the standing and softening points of the first glass 100, Can be 19 dPa · s.

Since the supporting glass 300 has a higher viscosity than the first glass 100 at a temperature between the standing point of the first glass 100 and the softening point of the first glass 100, The sagging phenomenon is suppressed and the sagging of the first glass 100 is effectively prevented and the first glass 100 can be closely contacted with the first glass 100 and the same shape can be maintained.

According to an embodiment of the present invention, the thickness of the support glass 300 may be 0.3 mm or more and 1.0 mm or less. The support glass 300 having a thickness of 0.3 mm or more can be used to prevent the support glass 300 from being damaged by the weight of the first glass 100 in the process of curving the first glass 100, 1 glass 100 can be supported. Further, by using the support glass 300 having a thickness of 1.0 mm or less, it is possible to facilitate the deformation of the support glass 300 near the softening point of the first glass 100, And the support glass 300 supports the central portion of the first glass 100, thereby effectively suppressing the occurrence of the call-up phenomenon.

According to an embodiment of the present invention, the first glass 100 may be soda lime glass, and the supporting glass 300 and the second glass 200 may be alkali-free glass.

According to an embodiment of the present invention, a known glass which can be used for the building or the transportation means can be used as the first glass, and the sodalime glass can be used for the first glass 100. The soda lime glass which can be used for the first glass 100 may be, for example, 65 wt% or more and 75 wt% or less of Si0 ₂ , 0 wt% or more and 10 wt% or less of Al ₂ O ₃ per 100 wt% ₂ 10 wt% to 15 wt%, K ₂ O 0 wt% to 5 wt%, CaO 1 wt% to 12 wt%, and MgO 0 wt% to 8 wt% But it can be used without limitation as long as the desired mechanical properties, weatherability, surface smoothness and the like can be obtained. The first glass 100 may be glass manufactured by a float method using a float bath or glass produced by a down draw method or a fusion method.

Also, according to an embodiment of the present invention, the supporting glass 300 and the second glass 200 may be known glass which can be used for a building or a transportation means, and an alkali-free glass may be used. The alkali-free glass that can be used as the support glass 300 and the second glass 200 may be a B ₂ O ₂ -based glass or an Al ₂ O ₃ -based glass. For example, B ₂ O ₂ based composition of the glass is per 100 wt% composition of Si0 ₂ 46 wt% or more 57 wt% or less, Al ₂ O ₃ 21 wt% or more 29 wt% or less, MgO 3 wt% or more 14 wt% Or less and a glass composition containing 11 wt% or more and 16 wt% or less of CaO and substantially containing no alkali metal oxide may be used. The composition of the Al ₂ O ₃ -based glass is 46 wt% or more and 57 wt% or less of Si0 ₂ , 21 wt% or more and 29 wt% or less of Al ₂ O ₃ , 3 wt% or more and 14 wt% or less of MgO, A glass composition containing CaO 11 wt% or more and not more than 16 wt% and substantially containing no alkali metal oxide may be used.

The term substantially containing no alkali metal oxide means that the alkali metal oxide is not contained in the glass at all, or even if the alkali metal oxide is included in the glass, its content is extremely small as compared with other components, And the like. For example, the term " substantial " means that it may contain a small amount of an alkali metal element which is inevitably incorporated into the glass from a refractory material in contact with the molten glass or an impurity in the glass raw material in the production process of the glass.

The supporting glass 300 and the second glass 200 according to an embodiment of the present invention may contain an alkali metal (Li, Na, K, etc.) oxide in an amount of less than 1% Alkali-free glass can be used as long as the desired mechanical properties, weather resistance, surface smoothness and the like can be obtained. Alkali glass borosilicate glass or non-alkali aluminoborosilicate glass can be used for the support glass 300 and the second glass 200, and glass produced by the float method, glass produced by the down-draw method or the fusion method, It can also be used.

The bonding step according to an embodiment of the present invention can bond the supporting glass or the second glass to the first glass using a bonding film 500 or an adhesive.

The curved surface glass can be manufactured by bonding the curved support glass 300 or the plate-shaped second glass 200 to one surface of the first glass 100 using the bonding film 500 or an adhesive. For example, a curved laminated glass can be manufactured by placing the bonding film 500 between one side of the second glass 200 and one side of the first glass 100 processed to be curved, and then pressing the bonding film 500. One side of the second glass 200 may be bonded to one side or the other side of the first glass 100 by applying an adhesive to one side of the second glass 200.

The bonding film 500 according to an embodiment of the present invention may be a single layer or a multilayer. When the bonding film 500 is formed of two or more layers, the compositions of the respective layers may be different from each other, and the thickness of each layer may be the same or different. The bonding film 500 may be formed of a (co) polymer film of a material commonly used as a bonding layer to a bonded glass in the art, such as a polyvinyl alcohol (PVA) and a polyvinyl butyral (PVB) Can be used. (PE), ethylene-vinyl acetate copolymer (EVA), polypropylene (PP), polystyrene (PS), methacrylic resin (PMA), polyvinyl chloride (PVC), polyethylene terephthalate Polybutylene terephthalate (PBT), cellulose acetate (CA), diallyl phthalate resin (DAP), urea resin (UP), melamine resin (MF), unsaturated polyester (UP), polyvinyl butyral (PVF), polyvinyl alcohol (PVAL), vinyl acetate resin (PVAc), ionomer (IO), polymethylpentene (TPX), vinylidene chloride (PVDC), polysulfone (PEEK), polyether sulfone (PESF), polyether ether ketone (PEEK), polyether sulfone (PESF), polybutylene terephthalate Can be used. The bonding film 500 has an adhesive strength to fix the second glass 200 or the supporting glass 300 to the first glass 100 with a desired strength and is excellent in transparency and chemical durability against visible light It may be desirable to use the < RTI ID = 0.0 >

The thickness of the bonding film 500 according to an embodiment of the present invention may be 0.5 mm or more and 1 mm or less, but is not limited thereto. However, when the thickness of the bonding film 500 is less than 0.5 mm, the impact absorbing property of the bonding film 500 is lowered, and the adhesion to the supporting glass 300 or the second glass 200 and the first glass 100 The force to fix the supporting glass 300 or the second glass 200 to the first glass 100 may be weakened and interface detachment may occur. On the other hand, if the thickness of the bonding film 500 exceeds 1.0 mm, optical distortion may occur in the curved surface bonded glass.

According to one embodiment of the present invention, in order to stably fix the support glass 300 or the second glass 200 to the first glass 100 while maintaining the rigidity of the curved glass laminate, May preferably be 0.5 mm or more and 1 mm or less in thickness.

According to one embodiment of the present invention, the adhesive may include Optically Clear Adhesive (OCA), Liquid Optically Clear Adhesive (LOCA), or Optically Clear Resin (OCR). For example, the adhesive may be applied to one side of the supporting glass 300 or the second glass 200 to a thickness of 0.5 mm or more and 1.5 mm or less.

According to one embodiment of the present invention, the bonding step may be performed at a temperature of 80 ° C or more and 140 ° C or less. According to an embodiment of the present invention, after the first glass 100 is curved, the supporting glass 300 or the second glass 200 is bonded to the first glass 100 at a temperature of 80 ° C. or more and 140 ° C. or less The bonding film 500 or the adhesive is denatured to prevent the adhesive strength from being reduced, and the manufacturing cost can be reduced.

Furthermore, the bonding process of the supporting glass 300 or the second glass 200 and the first glass 100 can be completed by performing a process of high temperature and high pressure treatment in an autoclave.

FIG. 3 is a view illustrating a process of bonding one surface of a second glass according to an embodiment of the present invention to a concave surface of a curved first glass. FIG. 4 is a cross- And a process of joining one surface of the glass to the convex surface of the first glass processed into a curved surface.

According to an embodiment of the present invention, the joining step may be performed by elastically deforming the curved support glass 300 or the plate-shaped second glass 200 to match the curved first glass 100 .

According to an embodiment of the present invention, the second glass plate 200 or the curved supporting glass 300 is aligned with the concave one surface or the convex surface of the first glass 100 processed to be curved, The second glass 200 or the supporting glass 300 may be elastically deformed. As the supporting glass 300 or the second glass 200 is elastically deformed, the supporting glass 300 or the second glass 200 is precisely formed on a concave surface or a convex surface of the curved first glass 100 They can be closely contacted and matched. As the first glass 100 and the supporting glass 300 or the second glass 200 are matched with each other, it is possible to suppress the occurrence of lifting between the glass in the curved glass to be manufactured, Performance can be improved.

Accordingly, the method of manufacturing curved laminated glass according to an embodiment of the present invention is a method of manufacturing a curved laminated glass in which a supporting glass 300 or a second glass 200 included in a curved laminated glass is curved By elastically deforming, the manufacturing process can be simplified, and the manufacturing cost and manufacturing time of the curved glass can be shortened.

The method of applying elastic deformation to the second glass 200 or the supporting glass 300 is not particularly limited as long as it is a method commonly used in the art. The support glass 300 or the second glass 200 is subjected to a pressing process using a high-temperature roller or a vacuum ring / vacuum bag process at a temperature of about 20 캜 to 35 캜, It is possible to apply a deformation.

The process of bonding the support glass 300 to the first glass 100 is the same as or similar to the process of bonding the second glass 200 to the first glass 100, For convenience, the second glass 200 is bonded to the first glass 100 in detail.

According to an embodiment of the present invention, a curved laminated glass can be manufactured by bonding the second glass 200 to a concave surface of the curved first glass 100 as shown in FIG. 3, when an elastic deformation is applied to the second glass 200 to join the second glass 200 to the first glass 100, the first glass 100 is not elastically deformed A compressive stress can be formed on the other surface of the second glass 200. By forming a compressive stress on the other surface of the second glass 200, the impact resistance and breakage strength of the curved surface bonded glass to be manufactured can be effectively improved.

In addition, since the second glass 200 is elastically deformed and joined to the concave surface of the first glass 100, the second glass 200 in the planar state before the elastic deformation is deformed to the first glass It may be desirable to have a dimension smaller than the dimension 100. [ Further, it is preferable that the second glass 200 after the elastic deformation is formed by forming edges together at the same position as the curved first glass 100.

Referring to FIG. 4, a curved laminated glass can be manufactured by joining the second glass 200 to the convex surface of the first glass 100 processed into a curved surface. Alkali glass may be used as the second glass 200, and the prepared curved glass can be applied to a window of a building or a transportation means. For example, when the curved laminated glass is applied to an automobile window, since the non-alkali glass as the second glass 200 is located outside the automobile window, the automobile window has high scratch resistance and high glass The surface hardness can be secured. As a result, damage to the external foreign object such as sand coming from the outside of the vehicle can be effectively reduced. Further, the alkali-free glass used as the second glass 200 has a high fracture toughness and can provide an automotive window having excellent fracture resistance due to an external impact.

Since the second glass 200 is resiliently deformed and joined to the convex surface of the first glass 100, the second glass 200 in a planar state before being elastically deformed is deformed by the first glass 100 Lt; RTI ID = 0.0 > 100). ≪ / RTI > Further, it is preferable that the second glass 200 after the elastic deformation is formed by forming edges together at the same position as the curved first glass 100.

According to one embodiment of the present invention, the plate-like second glass 200 can be made from unreinforced glass that is not chemically reinforced, unreinforced glass that is not reinforced with heat, unreinforced glass that is not reinforced by chemical and heat It may be a flat thin plate glass in an unformed state.

Typical reinforced glass is glass reinforced glass with heat-strengthening glass using physical heat and chemical ion exchange by increasing the strength of glass and imparting impact resistance and resilience. In the case of manufacturing the bonded glass using the tempered glass, it is not easy to process and form the tempered glass, so that the defect rate of the bonded glass to be manufactured is high and the cost of manufacturing the bonded glass is high.

On the other hand, according to one embodiment of the present invention, since the second glass 200 that has not undergone the chemical strengthening process or the heat strengthening process can be used, the process can be easily performed and the manufacturing cost can be reduced. Thereby solving the problems that may occur in the process of manufacturing the bonded glass. Further, in the case of the ion-enhanced glass, there is a problem that the cleaning process is required after the ion-strengthening process is performed at a high temperature for a certain period of time, thereby increasing the production time and production cost of the bonded glass. On the other hand, according to the embodiment of the present invention, when the second glass 200 is used, the manufacturing cost and manufacturing time can be shortened by omitting the strengthening process.

As the second glass 200 according to an embodiment of the present invention, any glass which is constituted of components and contents commonly used can be adopted without any particular limitation, but it may be preferable to use an alkali-free glass. The alkali-free glass that can be used for the second glass 200 is excellent in abrasion resistance and impact resistance of the surface as compared with ordinary glass because there is no or very little alkali component that weakens the bonding force of glass, Since the curved laminated glass can be formed by bonding to the glass 100, the manufacturing process can be simplified and the manufacturing time can be shortened.

According to an embodiment of the present invention, the plate-like support glass 300 may be used as the plate-like second glass 200, and the plate-like second glass 200 may be formed of the plate- May be used. In addition, when the curved support glass 300 is used to manufacture the curved glass laminate, since the support glass 300 is processed into a curved surface, it is elastically deformed on one side of the first glass 100 There is an advantage that it can be easily joined.

FIG. 5 is a graph showing the results of securing rigidity according to a thickness ratio between a first glass and a second glass according to an embodiment of the present invention.

According to an embodiment of the present invention, the thickness ratio of the support glass 300 or the second glass 200 to the first glass 100 may be 0.1: 1 to 0.5: 1.

5, the x-axis represents the total glass thickness and the y-axis represents the deflection of the glass, that is, the degree of warpage. The curled joint glass according to another embodiment of the present invention is pressed at a constant load under the fixed state of the four corners of the curved joint glass to analyze the deflection of the center portion.

According to an embodiment of the present invention, the AR (Asymmetry ratio), which is the thickness of the second glass or the thickness of the supporting glass / the thickness of the first glass, may satisfy the range of 0.1 to 0.5. As the AR becomes smaller, the thickness of the second glass 200 or the supporting glass 300 becomes thinner and the thickness of the first glass 100 becomes thicker. As shown in FIG. 5, the thickness of the second glass 200 or the supporting glass 300 and the first glass 100 may be adjusted to reduce the degree of warpage of the curved glass. Specifically, when the AR is less than 0.1, it is difficult to achieve a lightening effect, and when AR is more than 0.5, it may be difficult to obtain an effect of increasing the rigidity.

Therefore, according to another embodiment of the present invention, by adjusting the thickness of the second glass 200 or the supporting glass 300 and the first glass 100, the effect of increasing the rigidity of the manufactured curved laminated glass and reducing the weight Can be improved.

The second glass 200 according to an embodiment of the present invention may have a higher fracture toughness than the first glass 100. Specifically, the second glass 200 may have a fracture toughness of 135% or more and 145% or less of the first glass 100. The fracture toughness values of the second glass 200 and the first glass 100 are measured using a Vickers indenter until the glass is cracked, and then the indentation fracture is calculated by using crack length, and can be measured using a toughness measurement method.

The second glass 200 according to an embodiment of the present invention may have a fracture toughness of 1.1 MPa · m ^1/2 or more and 1.3 MPa · m ^1/2 or less, specifically, 1.15 MPa · m ^1/2 can have a fracture toughness of at least 1.25 MPa · m ^1/2 or less, 1.18 MPa · m ^1/2 more than 1.21 MPa · m ^1/2. If the fracture toughness of the second glass 200 is less than 1.1 MPa · m ^1/2 , there may be a problem that the second glass 200 is broken during the process of bonding with the first glass 100, There is a possibility that the impact resistance of the curved laminated glass may deteriorate. In addition, when the fracture toughness of the second glass 200 exceeds 1.3 MPa · m ^1/2 , the productivity of the second glass 200 disk is lowered and the manufacturing cost of the curved glass is increased . Therefore, it is preferable that the second glass 200 according to an embodiment of the present invention has a fracture toughness of 1.1 MPa · m ^1/2 or more and 1.3 MPa · m ^1/2 or less. In addition, the first glass 100 may have a fracture toughness of 0.7 MPa · m ^1/2 or more and 0.85 MPa · m ^1/2 or less.

The second glass 200 according to an embodiment of the present invention may have a higher elastic modulus and Vickers hardness than the first glass 100. Specifically, the second glass 200 may have an elastic modulus of 104% or more and 117% or less and a Vicker's hardness of 115% or more and 127% or less of the first glass 100.

The elastic modulus of the second glass 200 and the first glass 100 can be measured by a three-point bending test, and the Vickers hardness can be calculated by measuring the size of a mark after pressing the glass using a Vickers indentor .

The second glass 200 according to an exemplary embodiment of the present invention may have a Vickers hardness of 550 HV to 650 HV, and more specifically, a Vickers hardness of 570 HV to 630 HV and 590 HV to 610 HV. Also, the first glass 100 may have Vickers hardness of 500 HV or more and 550 HV or less.

Since the second glass 200 has a higher modulus of elasticity than the first glass 100, the second glass 200 may be manufactured to be lightweight and thin compared to the first glass 100, The glass can have a strong structure. In addition, the second glass is not reinforced, and visibility can be secured easily even if breakage occurs when a windshield is applied.

The thickness of the second glass 200 according to an embodiment of the present invention may be 0.3 mm or more and 1.0 mm or less. Also, the thickness of the first glass 100 may be greater than the thickness of the second glass 200.

The second glass 200 according to an exemplary embodiment of the present invention can be manufactured to have a thickness of 0.3 mm or more and 1.0 mm or less, specifically, a thickness of 0.3 mm or more and 0.7 mm or less, more specifically, a thickness of 0.5 mm . If the thickness of the second glass 200 is less than 0.3 mm, the impact resistance of the curved glass laminate may be reduced. If the thickness of the second glass 200 exceeds 1.0 mm, Elastic deformation of the curved laminated glass 200 may not be easy, and it may be difficult to obtain a lightening effect of the curved laminated glass to be produced.

Therefore, according to the embodiment of the present invention, the second glass 200 having the above-mentioned thickness can attain light weight of the curved laminated glass due to its high mechanical properties. In addition, the second glass 200 is a non-tempered glass which is strong against local impact. Even if the second glass 200 is damaged, secondary damage caused by the user's visual disturbance or scattered glass is very small compared with tempered glass.

The first glass 100 according to an embodiment of the present invention may be manufactured to a thickness of 1.4 mm or more and 3 mm or less. If the thickness of the first glass 100 is less than 1.4 mm, the impact resistance of the curved glass laminate may be reduced. If the thickness of the first glass 100 exceeds 3 mm, It may be difficult to obtain a lightening effect of the laminated glass. Therefore, it is preferable that the thickness of the first glass 100 is 1.4 mm or more and 3 mm or less.

The upper limit value and the lower limit value of the thickness of the second glass 200 and the first glass 100 can both be determined in consideration of elastic absorption of an external force and a mechanical impact force.

According to an embodiment of the present invention, the supporting glass 300 or the second glass 200 bonded in the bonding step may have the same radius of curvature as the curved first glass 100.

As the support glass 300 or the second glass 200 is elastically deformed, the curved first glass 100 and the elastically deformed support glass 300 or the second glass 200 have the same radius of curvature Lt; / RTI > Since the curved first glass 100 and the elastically deformed supporting glass 300 or the second glass 200 have the same radius of curvature, they can be more precisely matched, and the curved laminated glass The transmission performance can be improved. When the curved laminated glass is used in a window of a building or a transportation means, there is an advantage that a user can secure a clear view.

The curved first glass 100 and the elastically deformed supporting glass 300 or the second glass 200 may have a radius of curvature of 3,000 mm or more and 10,000 mm or less. Specifically, the radius of curvature of the curved first glass 100 and the elastically deformed supporting glass 300 or the second glass 200 may be 4,000 mm or more and 8,000 mm or less and 5,000 mm or more and 7,000 mm or less. However, the radius of curvature of the first glass 100 and the supporting glass 300 or the second glass 200 may be different depending on the application of the window.

According to another embodiment of the present invention, there is provided a curved laminated glass produced by the method of manufacturing a curved laminated glass according to an embodiment of the present invention. The curved laminated glass can be applied to a functional product which requires a high level of optical quality because of its excellent optical quality because no crease occurs in the center portion.

According to another embodiment of the present invention, by forming the first glass 100 into a curved surface, the curved surface bonded glass to be manufactured may have a structure in which both sides are bent more than the middle portion. Further, the curved laminated glass can attain light weight, and is excellent in abrasion resistance and durability, so that it can be applied to a window of a building or a transportation means. The curved laminated glass can be applied to, for example, a front window, a side window, a rear window and a sunroof window of a car window.

Hereinafter, the present invention will be described in more detail with reference to examples. These embodiments are for illustrative purposes only and are not intended to be limiting of the present invention.

Manufacture of curved glass

Example 1

A composition comprising 73 wt% of Si0 ₂ , 0.15 wt% of Al ₂ O ₃ , 14 wt% of Na ₂ O, 0.03 wt% of K ₂ O, 9 wt% of CaO and 4 wt% of MgO per 100 wt% were prepared to a having a soda lime glass with a first glass, comprising the composition 100 wt% per _{Si0 2 61 wt%, Al 2} O 3 16 wt%, MgO 3 wt%, CaO 8 wt% or less and a thickness of 0.5 mm The alkali metal free glass was prepared as supporting glass. The soda lime glass has a softening point of 730 캜 and a standstill temperature of 550 캜. The softening point of the alkali-free glass is 940 캜 and the standstill temperature is 720 캜.

The soda lime glass was laminated on the upper surface of the alkali-free glass, and the laminated glass was placed on a molding frame. The soda lime glass was heated to 610 캜 between the stand-by temperature of the soda lime glass and the softening point temperature, And the surface of the soda lime glass was finished by slowly cooling the soda lime glass at a temperature of 550 占 폚 near -600 占 폚 / min.

Comparative Example 1

A composition comprising 73 wt% of Si0 ₂ , 0.15 wt% of Al ₂ O ₃ , 14 wt% of Na ₂ O, 0.03 wt% of K ₂ O, 9 wt% of CaO and 4 wt% of MgO per 100 wt% Lt; / RTI > were prepared. The soda lime glass has a softening point of 730 캜 and a standing temperature of 550 캜. Two glass soda lime glasses were laminated and the laminated glass was put on a mold, and the soda lime glass was curved by its own weight by heating to 610 캜 between the stand-frost point temperature and the softening point temperature of soda lime glass, The glass surface was slowly cooled to -6 ° C / min at 550 ° C, which is the temperature near the frost point of the glass, to complete the curved surface processing of the soda lime glass.

Fabrication of curved laminated glass

Were prepared a soda lime glass processed into a curved surface prepared in Example 1 as the first glass, Si0 ₂ 61 wt% sugar composition _{100 wt%, Al 2 O 3} 16 wt%, MgO 3 wt%, CaO 8 wt% Alkali glass having a thickness of 0.5 mm was prepared as a second glass, and a polyvinyl butyral (PVB) film having a thickness of 0.76 mm was also prepared as a bonding film. The bonding film was placed between the concave surface of the sodalime glass processed to be curved and the alkali-free glass, and the bonding film was pressed with a vacuum ring under a pressure of 80 Torr at 300 Torr. The press-bonded alkali-free glass and soda lime glass were treated in an autoclave at 130 캜 and 11.76 bar to prepare a curved laminated glass.

Manufacturing results

It was confirmed that the curved soda lime glass prepared in Example 1 had a desired curvature and was processed into a curved surface in a state in which the center portion was not subjected to folding. In addition, it was confirmed that the curved surface bonded glass produced by bonding the alkali glass to the concave surface of the curved soda lime glass has excellent bonding quality, less optical distortion, and no other defects.

On the other hand, it was confirmed that the two curved soda lime glasses prepared in Comparative Example 1 were curved in a state where a folding phenomenon occurred in the center portion. In addition, it was confirmed that optical creep occurs in the curved laminated glass in which two sodalime glasses are bonded due to occurrence of call-up in the central part of the glass.

100: First glass
200: Second glass
300: Support glass
400: Molding frame
500: bonding film

Claims (13)

Preparing a plate-like support glass and a plate-like first glass;
Laminating the plate-like first glass on the upper surface of the plate-like support glass;
Heating the laminated support glass plate and the first glass plate to heat the first support glass plate and the plate-like first glass by their own weight; And
Bonding the curved support glass or the plate-shaped second glass onto one surface of the curved first glass,
Wherein the supporting glass has a higher softening point and a standing cold point than the first glass.
The method according to claim 1,
Wherein the step of curving comprises heating the first glass to a temperature not lower than a residence temperature of softening point of the first glass.
The method according to claim 1,
Wherein the joining step is to elastically deform the curved supporting glass or the plate-like second glass to match the curved first glass.
The method according to claim 1,
Wherein the bonding step is performed at a temperature of 80 ° C or more and 140 ° C or less.
The method according to claim 1,
Wherein the joining step joins the support glass or the second glass to the first glass using a bonding film or an adhesive.
The method according to claim 1,
Wherein the temperature ratio of the softening point of the support glass to the softening point of the first glass is 1: 0.7 to 1: 0.9.
The method according to claim 1,
Wherein the supporting glass has a softening point of 900 ° C or more and 1000 ° C or less and a standing temperature of 680 ° C or more and 770 ° C or less.
The method according to claim 1,
Wherein the supporting glass has a viscosity higher than that of the first glass.
The method according to claim 1,
Wherein the first glass is soda lime glass, and the support glass and the second glass are alkali-free glass.
The method according to claim 1,
Wherein the thickness of the supporting glass is 0.3 mm or more and 1.0 mm or less.
The method according to claim 1,
Wherein the thickness ratio of the supporting glass or the second glass to the first glass is 0.1: 1 to 0.5: 1.
The method according to claim 1,
Wherein the supporting glass or the second glass bonded in the joining step has the same radius of curvature as that of the curved first glass.
A curved laminated glass produced by the manufacturing method according to any one of claims 1 to 12.

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