WO2009014352A2

WO2009014352A2 - Manufacturing method of thin glass by stack-adhesion type and manufacture apparatus thereof

Info

Publication number: WO2009014352A2
Application number: PCT/KR2008/004212
Authority: WO
Inventors: Soon-Do Choi; Ug Son
Original assignee: E-World Co., Ltd.
Priority date: 2007-07-24
Filing date: 2008-07-18
Publication date: 2009-01-29
Also published as: WO2009014352A4; CN101589000A; WO2009014352A3; KR100826846B1

Abstract

A method and apparatus for manufacturing thin sheets of glass using stack and adhesion. Several sheets of mother glass are stacked and adhered using an adhesive providing easy adhesion and separation, and then the adhered sheets of mother glass are cut to desired size and then are subjected to surface grinding, etc., so that productivity is increased, while a fraction defective is decreased. Particularly, the productivity of tempered glass can be increased, and the fraction defective of the tempered glass can be reduced. Further, when small electronic products such as mobile phones are produced, the thickness of each electronic product can be reduced, and simultaneously the tempered glass can be efficiently manufactured due to the thickness reduction. Thus, the thin, small electronic products can be produced at a minimum manufacturing cost.

Description

MANUFACTURING METHOD OF THIN GLASS BY STACK- ADHESION TYPE AND MANUFACTURE APPARATUS

THEREOF

Technical Field

[1] The present invention relates to a manufacturing method of thin glass by a stack- adhesion type and a manufacture apparatus thereof and, more particularly, to a method and apparatus for manufacturing thin sheets of glass using stack and adhesion, in which several sheets of mother glass are stacked and adhered using an adhesive providing easy adhesion and separation, and then are subjected to cutting to desired size, surface grinding, etc., thereby increasing productivity and decreasing a fraction defective. Background Art

[2] In the small-size electronic products such as mobile phones, navigators, personal digital assistants (PDAs), MP3 players, and so on, a display window displaying an operated state generally employs thin glass material.

[3] Recently, from the aspect of improvement of portability and design, it is most important to reduce a thickness of the small-size electronic product. This thickness reduction is no longer permitted using ordinary material such as glass, acryl, or the like. For this reason, tempered glass is mainly used.

[4] The tempered glass is manufactured by cutting mother glass, performing surface grinding and edge grinding on the cut glass, and enhancing strength of the glass through chemical strengthening (or thermal strengthening), and hardening the glass.

[5] When thin mother glass is made thinner through the strengthening process, the greatest problems include reduction in productivity, occurrence of failure, etc. accompanied with difficulty in handling.

[6] In detail, according to a conventional ordinary working method, a big-size mother glass is cut into predetermined size in consideration of allowance, and then is subjected to surface grinding for desired dimensions and shape. Then, the glass is again subjected to edge grinding in order to remove sharp edges of the glass.

[7] However, the conventional working method has the following problems.

[8] First, in the process of cutting each sheet of thin mother glass to small size and then performing the surface grinding and edge grinding on the cut glass, manpower and time are excessively wasted. This requires excessive production costs when the tempered glass is wrought.

[9] Second, in the cutting, surface grinding, and edge grinding processes, the very thin mother glass is subjected to much shock and stress when wrought, and thus a damage rate of the glass is high. As a result, a fraction defective of the products is increased.

[10] Third, fine glass chips generated when the glass is wrought stick to and scratch surfaces of the glass, and thus the surfaces of the glass exhibit scratches. As a result, a fraction defective of the products is increased. Disclosure of Invention Technical Problem

[11] The present invention has been made to solve the foregoing problems with the prior art, and therefore exemplary embodiments of the present invention provide a method and apparatus for manufacturing thin sheets of glass using stack and adhesion, in which several sheets of mother glass are stacked and adhered using an adhesive, which is easily fused at a temperature lower than a fusion point of the glass and is closely adhered to and layered on surfaces of the glass due to its adhesiveness, before mother glass is cut, are subjected to cutting and surface grinding, and are separated from each other, are subjected to edge grinding, thereby conveniently and efficiently performing the working processes such as cutting, surface grinding, and edge grinding, and preventing the glass from being attached and scratched by glass powder during the working process, and thus enabling efficient production. Technical Solution

[12] According to an aspect of the present invention, a method for manufacturing sheets of glass comprises the steps of: preparing an adhesive having a fusion point lower than that of the glass and adhesiveness for adhering the sheets of glass; charging the adhesive into a fusing tank, heating the charged adhesive in a solution state; loading the sheets of glass into the fusing tank one by one such that the adhesive is layered between the sheets of glass with each sheet of glass covered with the adhesive; bringing the loaded sheets of glass out of the fusing tank, and cooling the sheets of glass such that the adhesive is cured and solidified between the sheets of glass and is adhered to the sheets of glass; and cutting the adhered sheets of glass, performing the cut sheets of glass on surface grinding, separating the surface-ground sheets of glass from each other, performing the separated sheets of glass on edge grinding, removing the adhesive from the edge-ground sheets of glass, and strengthening the sheets of glass.

[13] In an exemplary embodiment of the present invention, the adhesive may include one of pine resin and a mixture that paraffin of 30 weight parts or less is mixed with the pine resin.

[14] According to another aspect of the present invention, a method for manufacturing sheets of glass comprises the steps of: a) charging an adhesive into a fusing tank, and fusing the adhesive; b) loading and stacking the sheets of glass into the fusing tank; and c) bringing the stacked sheets of glass out of the fusing tank, and cooling the adhesive layered between the stacked sheets of glass.

[15] In an exemplary embodiment of the present invention, the method may further comprise the steps of: after the step c), dl) cutting the stacked sheets of glass to predetermined size and performing surface grinding on the cut sheets of glass; d2) separating the cut sheets of glass from each other, and performing edge grinding on the separated sheets of glass; d3) removing the adhesive from the edge-ground sheets of glass; d4) strengthening the sheets of glass from which the adhesive is removed; and d5) cleaning the strengthened sheets of glass, and inspecting the cleaned sheets of glass for defects.

[16] In another exemplary embodiment of the present invention, the step d3) may include immersing the sheets of glass into a solution in which the adhesive is resolved, and removing the adhesive from the sheets of glass.

[17] In another exemplary embodiment of the present invention, the solution may include one of alcohol and toluene.

[18] In another exemplary embodiment of the present invention, the adhesive may have a fusion point lower than that of the glass.

[19] In another exemplary embodiment of the present invention, the adhesive may include pine resin or a mixture in which a predetermined amount of impurities are mixed with the pine resin.

[20] In another exemplary embodiment of the present invention, the impurities may have a range from 20 weight parts to 30 weight parts on a basis of the pine resin of 100 weight parts.

[21] In another exemplary embodiment of the present invention, the impurities may include paraffin.

[22] In another exemplary embodiment of the present invention, the step a) may include indirectly heating and fusing the adhesive in the fusing tank.

[23] In another exemplary embodiment of the present invention, the step b) may include loading and stacking the sheets of glass into the fusing tank one by one.

[24] In another exemplary embodiment of the present invention, the step c) may include cooling the adhesive in an atmosphere using air.

[25] According to another aspect of the present invention, an apparatus for manufacturing sheets of glass comprises: a fusing tank, in which an adhesive is fused, and into which the sheets of glass is loaded; a heating tank enclosing the fusing tank and filled with water or fruit oil heated by a heater installed therein; a loading/unloading unit disposed above the fusing tank, immersing the sheets of glass into the adhesive fused in the fusing tank, and including a seat onto which the sheets of glass are loaded and which is lowered into the fusing tank whenever the sheets of glass are loaded one by one; and a pressing plate disposed above the seat and pressing the sheets of glass by means of elevatable cylinders.

[26] According to another aspect of the present invention, an apparatus for manufacturing sheets of glass comprises: a body; a heating unit installed in the body and heating and fusing an adhesive; and a loading/unloading unit disposed above the heating unit, loading the sheets of glass into the heating unit such that the fused adhesive is adhered to surfaces of each sheet of glass, and unloading the loaded sheets of glass out of the heating unit.

[27] In an exemplary embodiment of the present invention, the apparatus may further comprise a platform unit installed between a bottom of the body and the heating unit.

[28] In another exemplary embodiment of the present invention, the heating unit may include: a fusing tank having a storage space into which the adhesive is charged and fused; a heating tank provided outside the fusing tank and having an inner space in which heat transfer substance is stored; and a heater installed in the inner space of the heating unit and heating the heat transfer substance to fuse the adhesive in the fusing tank.

[29] In another exemplary embodiment of the present invention, the loading/unloading unit may include: a screw passing through an upper portion of the body; a motor rotatably connected with the screw through a belt; elevation plate support posts fixedly coupled to the upper portion of the body in a downward direction, an elevation plate coupled to the elevation plate support posts so as to move up and down, and raised and lowered by rotation of the screw; longitudinal support posts fixedly coupled with the elevation plate; and a seat which is coupled to lower ends of the longitudinal support posts, and onto which the sheets of glass are stacked and loaded.

[30] In another exemplary embodiment of the present invention, the loading/unloading unit may further include: transverse support bars coupled to intermediate portions of the longitudinal support posts in a transverse direction; cylinders coupled to the transverse support bars in a downward direction; and a pressing plate fixedly coupled with the cylinders and pressing the stacked sheets of glass by downward operation of the cylinders.

[31] In another exemplary embodiment of the present invention, the adhesive may have a fusion point lower than that of the glass.

[32] In another exemplary embodiment of the present invention, the adhesive may include pine resin or a mixture in which a predetermined amount of impurities are mixed with the pine resin.

[33] In another exemplary embodiment of the present invention, the impurities may have a range from 20 weight parts to 30 weight parts on a basis of the pine resin of 100 weight parts.

[34] In another exemplary embodiment of the present invention, the impurities may include paraffin.

Advantageous Effects

[35] According to exemplary embodiments of the present invention, the method and apparatus for manufacturing thin sheets of glass using stack and adhesion has the following effects.

[36] First, once the sheets of mother glass are immersed into the fusing tank, are brought out of the fusing tank, and are cooled in the atmosphere, they are formed into one block. The glass block is subjected to cutting, surface grinding, and edge grinding. Thus, productivity is greatly improved, which makes a very efficient work possible. In particular, when glass block units, into which the glass block is cut, are subjected to the surface grinding, the shock and stress applied to each glass block unit are distributed without concentration. Thus, the damage to the glass material occurring in the working process can be minimized, and the fraction defective can be remarkably reduced.

[37] Second, the sheets of glass constituting each glass block unit are separated from each other one by one, and then are subjected to the edge grinding. In this case, since the adhesive is layered on the surfaces of each sheet of glass, it is possible to prevent the surfaces of each sheet of glass from being attached and scratched by glass particles, and thus the fraction defective can be considerably reduced in the process of manufacturing the tempered glass.

[38] Third, when small electronic products such as mobile phones are produced, the thickness of each electronic product can be reduced, and simultaneously the tempered glass can be efficiently manufactured due to the thickness reduction. Thus, the thin, small electronic products can be produced at a minimum manufacturing cost. Brief Description of the Drawings

[39] FIG. 1 illustrates the structure of an apparatus for manufacturing thin sheets of mother glass using stack and adhesion according to an embodiment of the present invention.

[40] FIG. 2 illustrates a process of forming thin sheets of mother glass into one block according to an embodiment of the present invention,

[41] FIG. 3 illustrates cutting and surface grinding processes of a glass block according to an embodiment of the present invention.

[42] FIG. 4 illustrates edge grinding and cleaning processes of cut glass block units according to an embodiment of the present invention.

[43] <Major Reference Numerals and Symbols of the Drawings>

[44] 100: apparatus for manufacturing thin sheets of glass [45] 110: body 120: platform unit

[46] 121: platform support post

[47] 122: platform support plate

[48] 130: heating unit 131: fusing tank

[49] 132: heating tank 133: heater

[50] 140: loading/unloading unit

[51] 141: screw 142: motor

[52] 143: elevation plate support post

[53] 144: elevation plate 145: longitudinal support post

[54] 146: seat 147: transverse support bar

[55] 148: cylinder 149: pressing plate

[56] C: adhesive G: mother glass

[57] Gl : glass block unit

Mode for the Invention

[58] Hereinafter, an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings. Among the accompanying drawings, FIG. 1 illustrates the structure of an apparatus for manufacturing thin sheets of glass using stack and adhesion according to an embodiment of the present invention, FIG. 2 illustrates a process of forming thin sheets of mother glass into one block according to an embodiment of the present invention, FIG. 3 illustrates cutting and surface grinding processes of a glass block according to an embodiment of the present invention, and FIG. 4 illustrates edge grinding and cleaning processes of cut glass block units according to an embodiment of the present invention.

[59] Referring to the figures, the apparatus 100 for manufacturing thin sheets of glass using stack and adhesion (hereinafter, referred to as manufacturing apparatus 100 ) according to an embodiment of the present invention includes a body 110, a platform unit 120, a heating unit 130, and a loading/unloading unit 140.

[60] The platform unit 120 is installed on an inner bottom of the body, and includes platform support posts 121 fixedly coupled to the bottom of the body, and a platform support plate 122 fixedly coupled to upper ends of the platform support posts 121.

[61] The heating unit 130 is located on top of the platform support plate 122, and preferably includes a fusing tank 131 forming a storage space S, a heating tank 132 enclosing the outside of the fusing tank 131, and a heater 133 installed in the heating tank 132.

[62] The manufacturing apparatus 100 according to an embodiment of the present invention employs a double heating system in order to prevent an adhesive C charged into the storage space S of the fusing tank 131. Thus, the heating tank 132 is filled therein with heat transfer substance such as water or fruit oil. Thus, the adhesive charged into the fusing tank 131 is indirectly heated by the water or the fruit oil heated through the heater 133.

[63] The adhesive C can employ only 100% of pine resin, or a mixture in which 20-30 weight parts of paraffin is mixed on the basis of 100 weight parts of pine resin in consideration of a thickness of the mother glass, or seasonal conditions such as temperature. Here, the paraffin serves to increase viscosity and thus adhesiveness between the materials to be adhered. If the adhesive exceeds 30 weight parts of paraffin on the basis of 100 weight parts of pine resin, the adhesiveness of the adhesive becomes excessive. This makes it difficult to remove the adhesive when the adhesive is removed in a post-treatment process.

[64] Further, the adhesive C preferably has a fusing temperature of 150 C or less. If the fusing temperature of the adhesive exceeds that temperature, this is not preferable because the fused substance has a possibility of varying physical properties of the mother glass.

[65] Meanwhile, the adhesive C used in the manufacturing apparatus 100 according to an embodiment of the present invention can use the aforementioned substances as well as substances, such as polysaccharides (e.g. starches), proteins, blood serums, fish glues, pine resins, lacquers, Arabic gums, etc., which can be obtained from animals or plants, and substances, such as sandaracs, Stick lacs, shellacs, latex, gums, etc., which can be obtained from other natural resources.

[66] Further, it should be noted that the adhesive can use synthetic adhesives such as resins such as phenol resins, urea resins, melamine resins, epoxy resins, and so on, and polyesters, polyvinyl alcohols, acrylates, synthetic rubbers, silicones and so on.

[67] The loading/unloading unit 140 is installed above the heating unit 130, and is a device that stacks and loads sheets of mother glass G into the fusing tank 131 such that the adhesive C fused in the fusing tank 131 is adhered to surfaces of the sheets of mother glass. The loading/unloading unit 140 includes a screw 141, a motor 142, elevation plate support posts 143, an elevation plate 144, longitudinal support posts 145, and a seat 146.

[68] The motor 142 is installed on an upper, outer side of the body 110, is connected with the screw 141, which passes through the upper portion of the body 110, through a belt 142a, and rotates the screw 141. When the screw 141 is rotated, the elevation plate 144 engaged with the screw 141 is guided to move up and down by the elevation plate support posts 143. Meanwhile, the motor 142 is a reversible motor, and forward or backward rotation thereof changes a rotating direction of the screw 141, thereby making it possible to raise and lower the elevation plate 144, which will be described below. [69] The longitudinal support posts 145 fixedly coupled to the elevation plate 144 moves together with the elevation plate 144 by means of upward and downward movement of the elevation plate 144. The seat 146 coupled to lower ends of the longitudinal support posts 145, and the sheets of mother glass G that are stacked on the seat 146 can be loaded into the fusing tank 131.

[70] Meanwhile, the loading/unloading unit 140 further includes transverse support bars

147 coupled to intermediate portions of the longitudinal support posts 145 in a transverse direction, cylinders 148 coupled to the transverse support bars 147 in a downward direction, and a pressing plate 149 fixedly coupled with the cylinders 148 and pressing the stacked sheets of mother glass G by downward operation of the cylinders 148.

[71] The cylinders 148 begin to operate when the sheets of mother glass G stacked on the seat 146 are loaded into the fusing tank 131. The pressing plate 149 presses the stacked sheets of mother glass G with predetermined pressure by the operation of the cylinders 148. Thus, the adhesive C is applied between the staked sheets of mother glass G, and thus is adhered to each sheet of mother glass G at a uniform thickness.

[72] In detail, in the case in which the sheets of mother glass G are loaded into the fusing tank 131, the adhesive C is completely fused, and then the sheets of mother glass G are loaded on the seat 146 one by one. At the outset, the seat 146 is located directly under a surface of the fused adhesive such that one sheet of mother glass G is slightly immersed, and then the seat 146 is gradually lowered while another sheet of mother glass G is loaded onto the immersed sheet of mother glass G.

[73] After the sheets of mother glass G are immersed up to a designated number, the pressing plate 149 is operated to press the sheets of mother glass G. At this time, the sheets of mother glass G are pressed with predetermined force, the adhesive C is applied between the sheets of mother glass G at a uniform thickness.

[74] Preferably, the thickness of the adhesive C applied between the sheets of mother glass G is about 20 microns. When the sheets of mother glass G are subjected to sur face grinding and then are separated from each other, each of the separated sheets of mother glass G has an adhesive layer with a thickness of about 10 microns.

[75] When the sheets of mother glass G are brought out of the fusing tank 131 in the state in which the pressing plate 149 presses the sheets of mother glass G, and then are cooled, the adhesion of the adhesive to the sheets of mother glass G is completed. In this state, when the adhered sheets of mother glass G are cut into glass block units. These glass block units Gl are subjected to surface grinding.

[76] Further, after the surface grinding, the glass block units Gl are subjected to edge grinding. After the edge grinding, the adhesive G is removed from each sheet of mother glass G. At this time, each sheet of mother glass G is immersed into a solution in which the adhesive C is well resolved, so that the adhesive G is removed. This solution includes alcohol or toluene.

[77] The materials that complete these processes are strengthened through thermal strengthening or chemical strengthening, and then cleaning, and final inspection. Thereby, the manufacturing process is completed.

[78] Hereinafter, a method of working thin sheets of glass using stack and adhesion using the aforementioned manufacturing apparatus will be described.

[79] The method of working thin sheets of glass using stack and adhesion according to an embodiment of the present invention includes the steps of a) charging an adhesive into a fusing tank and fusing the adhesive, b) loading and stacking a plurality of sheets of mother glass into the fusing tank, and c) bringing the stacked sheets of mother glass out of the fusing tank and cooling the adhesive applied between the stacked sheets of mother glass.

[80] After the step c), the method further includes the steps of dl) cutting the stacked sheets of mother glass to predetermined size and performing surface grinding on the cut sheets of mother glass, d2) separating the cut sheets of mother glass from each other and performing edge grinding on the separated sheets of mother glass, d3) removing the adhesive from the edge-ground sheets of mother glass, d4) strengthening the sheets of mother glass from which the adhesive is removed, and d5) cleaning the strengthened sheets of mother glass and inspecting the cleaned sheets of mother glass for defects.

[81] Further, the step d3) includes immersing the sheets of mother glass into a solution in which the adhesive is resolved, and removing the adhesive adhered to the surface of each sheet of mother glass. Here, the solution preferably includes alcohol and toluene.

[82] Meanwhile, in the step b), many sheets of thin and large mother glass G are adhered to each other. The adhesive C can be fused at a temperature lower than a fusion point of glass, and has adhesiveness such that the adhesive C is not fused when the sheets of mother glass are adhered or such that the sheets of mother glass are not separated from each other as long as physical force is not applied to the sheets of mother glass.

[83] The adhesive C can use only 100% of pine resin, or a mixture in which 20-30 weight parts of paraffin is mixed on the basis of 100 weight parts of pine resin in consideration of a thickness of the mother glass, or seasonal conditions such as temperature. Here, the paraffin serves to increase viscosity and thus adhesiveness between the materials to be adhered. If the adhesive exceeds 30 weight parts of paraffin on the basis of 100 weight parts of pine resin, the adhesiveness of the adhesive becomes excessive. This makes it difficult to remove the adhesive when the adhesive is removed in a post- treatment process.

[84] Meanwhile, the adhesive C used in the manufacturing apparatus 100 according to an embodiment of the present invention can use the aforementioned substances as well as substances, such as polysaccharides (e.g. starches), proteins, blood serums, fish glues, pine resins, lacquers, Arabic gums, etc., which can be obtained from animals or plants, and substances, such as sandaracs, Stick lacs, shellacs, latex, gums, etc., which can be obtained from other natural resources.

[85] Further, it should be noted that the adhesive can use synthetic adhesives such as resins such as phenol resins, urea resins, melamine resins, epoxy resins, and so on, and polyesters, polyvinyl alcohols, acrylates, synthetic rubbers, silicones, and so on.

[86] In the step b), the sheets of mother glass G are sequentially loaded onto the seat one by one. Thus, each sheet of mother glass is covered by the adhesive C, and the adhesive forms a layer between the neighboring sheets of mother glass.

[87] In this state in which the sheets of mother glass G are stacked, the sheets of mother glass G are brought out of the fusing tank, and gradually cooled in the atmosphere. Thereby, the adhesive is cured and solidified between the sheets of mother glass G, and simultaneously adheres the sheets of mother glass G.

[88] In addition, in the steps dl through d5, in the state in which many sheets of mother glass G are cut into glass block units, the following processes are carried out. Due to the glass block units, in each of which the sheets of mother glass G are not separated from each other, the treatments such as carriage, transportation, storage, etc. are possible en bloc, which provides convenience.

[89] In the step dl), the adhered sheets of mother glass G are cut to predetermined size at a time. The glass block units Gl obtained by cutting the adhered sheets of mother glass G to predetermined size are subjected to surface grinding in which lateral surfaces of each glass block unit are smoothly ground up to desired dimensions. This surface grinding can be performed at a time.

[90] In the step d2), after the surface grinding, the cut sheets of mother glass constituting each glass block unit Gl are separated from each other one by one, and then each sheet of mother glass is subjected to edge grinding for cutting off edges thereof. At this time, the cut sheets of mother glass constituting each glass block unit Gl are manually or automatically separated from each other, and then are subjected to the edge grinding.

[91] As one example of separating the sheets of glass constituting each glass block unit

Gl adhered in a block shape, when pressure is applied to the lateral surface of each glass block unit Gl in an inclined direction through a manual work or a mechanical work, the cut sheets of mother glass constituting each glass block unit Gl are continuously separated from one to which the pressure is applied first. This separation easily occurs because the adhesive force of the adhesive is weaker than the applied pressure. The separated sheet of mother glass physically separated in this way leaves a layer of the adhesive C. [92] Since the layer of the adhesive is formed on each separated sheet of mother glass during the edge grinding, the each separated sheet of mother glass is prevented from being scratched by fine glass particles, which are generated during the edge grinding and are adhered to the surface thereof, and is prevented from sliding to be scratched when fixed for the edge grinding.

[93] In the step d3), a cleaning process of removing the adhesive C from each material which has been subjected to the edge grinding is performed. In consideration of characteristics of the adhesive, each material Gl is immersed in a resolving substance in which the adhesive can be well resolved, so that the adhesive is resolved and removed by the resolving substance.

[94] In the step d4), a process of strengthening each material that has undergone the aforementioned working through thermal strengthening or chemical strengthening is performed. Finally, in the step d5), the strengthened materials are subjected to cleaning and final inspection. Thereby, the method of manufacturing thin sheets of glass using stack and adhesion is completed.

Claims

[1] A method for manufacturing sheets of glass, the method comprising the steps of: preparing an adhesive having a fusion point lower than that of the glass and adhesiveness for adhering the sheets of glass; charging the adhesive into a fusing tank, heating the charged adhesive in a solution state; loading the sheets of glass into the fusing tank one by one such that the adhesive is layered between the sheets of glass with each sheet of glass covered with the adhesive; bringing the loaded sheets of glass out of the fusing tank, and cooling the sheets of glass such that the adhesive is cured and solidified between the sheets of glass and is adhered to the sheets of glass; and cutting the adhered sheets of glass, performing the cut sheets of glass on surface grinding, separating the surface-ground sheets of glass from each other, performing the separated sheets of glass on edge grinding, removing the adhesive from the edge-ground sheets of glass, and strengthening the sheets of glass.

[2] The method as set forth in claim 1, wherein the adhesive includes one of pine resin and a mixture that paraffin of 30 weight parts or less is mixed with the pine resin.

[3] A method for manufacturing sheets of glass, the method comprising the steps of: a) charging an adhesive into a fusing tank, and fusing the adhesive; b) loading and stacking the sheets of glass into the fusing tank; and c) bringing the stacked sheets of glass out of the fusing tank, and cooling the adhesive layered between the stacked sheets of glass.

[4] The method as set forth in claim 3, further comprising the steps of: after the step c), dl) cutting the stacked sheets of glass to predetermined size and performing surface grinding on the cut sheets of glass; d2) separating the cut sheets of glass from each other, and performing edge grinding on the separated sheets of glass; d3) removing the adhesive from the edge-ground sheets of glass; d4) strengthening the sheets of glass from which the adhesive is removed; and d5) cleaning the strengthened sheets of glass, and inspecting the cleaned sheets of glass for defects.

[5] The method as set forth in claim 4, wherein the step d3) includes immersing the sheets of glass into a solution in which the adhesive is resolved, and removing the adhesive from the sheets of glass.

[6] The method as set forth in claim 5, wherein the solution includes one of alcohol and toluene.

[7] The method as set forth in claim 3, wherein the adhesive has a fusion point lower than that of the glass.

[8] The method as set forth in claim 7, wherein the adhesive includes pine resin.

[9] The method as set forth in claim 8, wherein the adhesive includes a mixture in which a predetermined amount of impurities are mixed with the pine resin.

[10] The method as set forth in claim 9, wherein the impurities has a range from 20 weight parts to 30 weight parts on a basis of the pine resin of 100 weight parts.

[11] The method as set forth in claim 9 or 10, wherein the impurities include paraffin.

[12] The method as set forth in claim 3, wherein the step a) includes indirectly heating and fusing the adhesive in the fusing tank.

[13] The method as set forth in claim 3, wherein the step b) includes loading and stacking the sheets of glass into the fusing tank one by one.

[14] The method as set forth in claim 3, wherein the step c) includes cooling the adhesive in an atmosphere using air.

[15] An apparatus for manufacturing sheets of glass, the apparatus comprising: a fusing tank, in which an adhesive is fused, and into which the sheets of glass is loaded; a heating tank enclosing the fusing tank and filled with water or fruit oil heated by a heater installed therein; a loading/unloading unit disposed above the fusing tank, immersing the sheets of glass into the adhesive fused in the fusing tank, and including a seat onto which the sheets of glass are loaded and which is lowered into the fusing tank whenever the sheets of glass are loaded one by one; and a pressing plate disposed above the seat and pressing the sheets of glass by means of elevatable cylinders.

[16] An apparatus for manufacturing sheets of glass, the apparatus comprising: a body; a heating unit installed in the body and heating and fusing an adhesive; and a loading/unloading unit disposed above the heating unit, loading the sheets of glass into the heating unit such that the fused adhesive is adhered to surfaces of each sheet of glass, and unloading the loaded sheets of glass out of the heating unit.

[17] The apparatus as set forth in claim 16, further comprising a platform unit installed between a bottom of the body and the heating unit.

[18] The apparatus as set forth in claim 16, wherein the heating unit includes: a fusing tank having a storage space into which the adhesive is charged and fused; a heating tank provided outside the fusing tank and having an inner space in which heat transfer substance is stored; and a heater installed in the inner space of the heating unit and heating the heat transfer substance to fuse the adhesive in the fusing tank.

[19] The apparatus as set forth in claim 16, wherein the loading/unloading unit includes: a screw passing through an upper portion of the body; a motor rotatably connected with the screw through a belt; elevation plate support posts fixedly coupled to the upper portion of the body in a downward direction, an elevation plate coupled to the elevation plate support posts so as to move up and down, and raised and lowered by rotation of the screw; longitudinal support posts fixedly coupled with the elevation plate; and a seat which is coupled to lower ends of the longitudinal support posts, and onto which the sheets of glass are stacked and loaded.

[20] The apparatus as set forth in claim 19, wherein the loading/unloading unit further includes: transverse support bars coupled to intermediate portions of the longitudinal support posts in a transverse direction; cylinders coupled to the transverse support bars in a downward direction; and a pressing plate fixedly coupled with the cylinders and pressing the stacked sheets of glass by downward operation of the cylinders.

[21] The apparatus as set forth in claim 16 or 18, wherein the adhesive has a fusion point lower than that of the glass.

[22] The apparatus as set forth in claim 21, wherein the adhesive includes pine resin.

[23] The apparatus as set forth in claim 21, wherein the adhesive includes a mixture in which a predetermined amount of impurities are mixed with the pine resin. [24] The apparatus as set forth in claim 23, wherein the impurities has a range from

20 weight parts to 30 weight parts on a basis of the pine resin of 100 weight parts. [25] The apparatus as set forth in claim 23 or 24, wherein the impurities include paraffin.