WO2016060381A1 - 유리의 면취 방법 - Google Patents

유리의 면취 방법 Download PDF

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Publication number
WO2016060381A1
WO2016060381A1 PCT/KR2015/009770 KR2015009770W WO2016060381A1 WO 2016060381 A1 WO2016060381 A1 WO 2016060381A1 KR 2015009770 W KR2015009770 W KR 2015009770W WO 2016060381 A1 WO2016060381 A1 WO 2016060381A1
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WO
WIPO (PCT)
Prior art keywords
glass
chamfering
heating element
present
tempered
Prior art date
Application number
PCT/KR2015/009770
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English (en)
French (fr)
Korean (ko)
Inventor
손동진
김동환
김종민
탁광용
Original Assignee
동우화인켐 주식회사
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Publication date
Application filed by 동우화인켐 주식회사 filed Critical 동우화인켐 주식회사
Publication of WO2016060381A1 publication Critical patent/WO2016060381A1/ko

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
    • B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
    • B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
    • B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
    • B24B9/10—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of plate glass
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
    • C03C25/002—Thermal treatment

Definitions

  • the present invention relates to a method of chamfering glass, and more particularly, to a method of processing the glass used in the touch screen panel to have a high strength without damage.
  • Glass products are treated as essential components in a wide range of technologies and industries, such as monitors, cameras, VTRs, mobile phones, video and optical equipment, automobiles, transportation equipment, various tableware, and construction facilities. According to the present invention, glass having various physical properties is manufactured and used.
  • a touch screen is a display and input device installed on a monitor for a terminal to perform a specific command to a computer by inputting various data such as simple contact or drawing a character or a picture by using an auxiliary input means such as a finger or a pen.
  • Such touch screens are increasingly important as a key component for various digital devices that transmit or exchange information to one or both of mobile communication devices such as smartphones, computers, cameras, certificates such as certificates, and industrial equipment. The range is expanding rapidly.
  • the upper transparent protective layer directly contacting the user among the components constituting the touch screen is mainly a plastic organic material such as polyester or acrylic, and the material is deformed due to continuous and repeated use and contact due to its low heat resistance and low mechanical strength. There is a limit in durability, such as being scratched or scratched. Therefore, the upper transparent protective layer of the touch screen is gradually replaced by the tempered thin glass which is excellent in heat resistance, mechanical strength and hardness from the conventional transparent plastic. In addition to the use of tempered thin glass as a transparent protective window of the LCD or OLED monitor in addition to the touch screen, its use area is gradually expanding.
  • Tempered glass is compressed due to the large compressive stress present on the surface when it is cut, and it breaks out of chaotic debris instead of the intended shape, or even if the cut is made in the intended shape. Since the stress disappears and the strength decreases, it is difficult to cut to a desired size or shape once it is strengthened regardless of the composition of the glass.
  • the cutting method of tempered glass requires very precise and stringent conditions as compared with the conventional cutting method of glass.
  • the method introduced as the cutting method of such tempered glass is as follows.
  • the diamond or carbide notching wheels are pulled across the glass surface so that the scale is mechanically inscribed on the glass plate, which is then cut by bending the glass plate along the scale to create a cutting edge.
  • mechanical cutting will produce lateral cracks of about 100 to 150 ⁇ m deep, which cracks arise from the cutting line of the eyewheel. Since the lateral cracks lower the strength of the window substrate, the cutouts of the window substrate must be polished and removed.
  • the method expands the glass surface by moving the laser along a predetermined path on the glass surface through a check on the edge of the window substrate, and along the path of the laser, by pulling the surface along with the cooler moving behind it.
  • the window substrate is cut by thermally propagating the cracks.
  • Chamfering process is generally performed by rotating the polishing wheel for the processing of the cut, that is, chamfering. Through the chamfering process, the smoothness of the cut portion is improved and the strength is increased. However, it was difficult to provide a window substrate having excellent strength in the conventional chamfering process.
  • WO 2005-044512 discloses a method for removing sharp edges by grinding and / or polishing edges of a cut glass substrate, but this method of holding, processing and transporting glass substrates has several disadvantages.
  • generated particles and chips may enter between the belt and the glass substrate and seriously damage the surface of the glass substrate. Such damage can often cause a series of processing steps to be interrupted, resulting in poor processing rates.
  • An object of the present invention is to provide a chamfering method of glass which can exhibit high strength by making the chamfering amount of glass uniform.
  • an object of this invention is to provide the glass chamfering method which can obtain the smooth chamfering surface.
  • a chamfering method of glass chamfered after contacting a heating element rotating at a rotational speed of 200 to 900 rpm to the side edge of the glass, wherein the total amount of heat delivered by the heating element to the glass satisfies Equation 1 below.
  • the heating element has a temperature of 1,300 to 1,700 °C, chamfering method of glass.
  • the heating element is moved at a speed of 0.5 to 5 m / min, chamfering method of glass.
  • the glass has a Vickers hardness of 200 to 1,200 kgf / mm2, chamfering method of the glass.
  • the present invention rotates the heating element when the heating element is in contact with the side edge of the glass and transmits a specific range of supply heat to the glass, the temperature distribution of the heating element is constant so that the chamfering of the glass substrate is uniform and thereby high strength Can be.
  • the present invention can effectively remove the fine cracks generated on the side of the glass to have a smooth chamfered surface and high strength.
  • FIG. 1 is a view schematically showing a heating element heated by a high frequency induction heating method.
  • FIG. 2 is a view schematically illustrating a chamfering method in which a heating element is moved while contacting a glass substrate to remove an edge where a horizontal plane and a vertical plane intersect the glass substrate in a strip form by thermal stress.
  • FIG 3 is a diagram illustrating a temperature distribution of a heating element when the center of the induction coil and the center of the heating element do not coincide.
  • FIG. 4 is a view schematically showing the surface before and after the processing of the glass substrate when the center of the induction coil and the center of the heating element do not coincide.
  • FIG. 5 is a view schematically showing a chamfering method according to the present invention.
  • FIG. 6 is a view showing the temperature distribution of the heating element in the chamfering method according to the invention.
  • FIG. 7 is a view schematically showing the surface before and after the processing of the glass substrate in the chamfering method according to the present invention.
  • FIG 8 is a schematic cross-sectional view (a) and a front view (b) of the side of a chamfered glass according to the present invention.
  • FIG. 9 is a view schematically showing an embodiment of a chamfering method according to the present invention.
  • FIG. 10 is a view schematically showing another embodiment of the chamfering method according to the present invention.
  • the present invention is a method of chamfering the glass chamfered after contacting the heating element to rotate at a rotational speed of 200 to 900rpm to the side edge of the glass, the total amount of heat delivered by the heating element to the glass satisfies Equation 1, It relates to a method of chamfering a tempered glass that can be made uniform to exhibit a uniform surface and excellent strength.
  • the heating element 10 heated by the high frequency induction coil 20 heating method contacts the edge of the glass substrate to cut the edge of the glass substrate by thermal stress. It is a method of chamfering a substrate.
  • the heating element of the present invention is in contact with the edge of the glass substrate, due to the characteristics of the glass having a low heat transfer rate, thermal stress is generated in the corner portion where the heating element is in contact, so that the portion from the contact portion of the heating element to a predetermined depth is separated. Therefore, when the heating element moves in contact with the edge of the glass substrate, the edge of the glass substrate may be chamfered.
  • the heating element 10 heated by the high frequency induction coil 20 heating method is moved while contacting the glass substrate 11 as shown in FIG. 2 (in the direction of the arrow in FIG. 2).
  • the center of the induction coil 20 and the center of the heating element 10 do not coincide with each other as shown in FIG. 3, the temperature distribution on the surface of the heating element 10 is not constant. Becomes non-uniform, whereby the glass substrate processing surface is not uniform, and thus the strength of the glass substrate falls.
  • matching the center of the induction coil 20 and the center of the heating element 10 is not easy in reality and takes a lot of time and effort.
  • the chamfering method of the present invention solves the above problem by rotating the heating element at a rotational speed of 200 to 900rpm.
  • the temperature distribution of the heating element is constant even if the center of the induction coil and the center of the heating element do not coincide.
  • the constant temperature distribution of the heating element herein includes that the temperature difference on the surface of the heating element is 10 ° C. or less.
  • the chamfering method according to the present invention for rotating the heating element 10 as shown in Figure 5 as shown in Figure 6 the temperature distribution on the surface of the heating element 10 is constant, so that the chamfering amount is uniform and thus has a high strength .
  • the rotational speed of the heating element is less than 200rpm, the temperature difference between the part near the induction coil and the part far from the induction coil is 20 °C or more, which may result in uneven temperature distribution of the heating element, resulting in uneven chamfering. If the rotational speed is more than 900rpm, the rotational speed is too fast may cause the glass to break due to the rotational force.
  • the total amount of heat (Q) supplied by the heating element to the glass may be controlled by the thermal conductivity of the glass, the temperature of the heating element, the temperature of the glass, the moving speed of the heating element, and the distance the heating element moves in the glass direction. If less than 50 Kcal, the chamfering does not occur due to the lack of the thermal stress required to cut the edge of the glass substrate, and if the total amount of heat supplied is more than 200 Kcal, the thermal stress is excessively deformed, the glass may be broken.
  • the chamfering method according to the invention can be carried out by contacting the side edge of the glass with a heating element having a temperature of 1,300 to 1,700 °C.
  • the heating element having the temperature range of the present invention is in contact with the side edge of the glass, the thermal stress is generated in the corner portion of the glass is separated from the heating element contact portion to a predetermined depth in the form of a strip.
  • the chamfering method according to the invention it is possible to significantly increase the elongation of the glass significantly lowered through the cutting step to 0.4% or more to improve the strength of the glass.
  • chamfering when the temperature of the heating element is less than 1,300 ° C., chamfering may not be performed, and when the temperature of the heating element is more than 1,700 ° C., the tempered glass may be melted.
  • the moving speed may be 0.5 to 5 m / min. If the moving speed is less than 0.5 m / min may cause damage to the protective layer, increase the amount of cutting and melting of the glass, and if it exceeds 5 m / min, the chamfered surface is rough and the chamfered shape may be uneven.
  • the material that can be used as a heating element is not particularly limited as long as it is a material that can transmit the temperature of the above-described heating element without deformation.
  • a ceramic material is mentioned, it is not limited to this.
  • the type of glass substrate to be chamfered to which the chamfering method of the present invention can be applied is not particularly limited, and examples thereof include conventional glass, tempered glass, and the like.
  • the tempered glass is not particularly limited, but in a preferred embodiment, the depth of the strengthening layer may be 10 ⁇ m to 200 ⁇ m, in another embodiment, 40 ⁇ m to 200 ⁇ m, and in another embodiment, 120 ⁇ m to 200 ⁇ m.
  • the tempered glass to which the chamfering method of the present invention may be applied may have a Young's modulus of 60 to 90 GPa, preferably 65 to 85 GPa.
  • Figure 8 is a schematic cross-sectional view (a) and the side of the chamfered glass Front view (b) is shown.
  • the method of processing the inclined upper and lower corners of the side surface of the glass to be inclined includes detailed conditions such as a specific sequence, the number of times of contacting the heating elements, and the inclination angle when the upper and lower corners are inclined. There is no special limitation.
  • an inclined surface may be formed by contacting the heating element with the upper edge portion 1 and the lower edge portion 2 of the side surface of the glass.
  • the heating element may be contacted with the upper edge portion and the lower edge portion of the side of the glass and then contacted with the heating element in a parallel direction of the side of the glass.
  • This embodiment can be adopted where necessary, as is the case where there are many parts of the tempered glass removed by the chamfering method.
  • 10 schematically shows a chamfering method of this embodiment. Referring to FIG. 10, first, an inclined surface is formed to a predetermined portion 1 by contacting a heating element at an upper edge portion of a side of the glass. Next, the heating element is brought into contact with the upper edge portion of the side surface of the glass to form an inclined surface up to a predetermined portion (2). Subsequently, the final cross-sectional shape can be obtained by contacting the heating element in the parallel direction of the side surfaces of the glass to remove the glass to the required portion 3.
  • the order of the chamfering process can be changed, and thus, the chamfering process may be performed in a different order from that shown in FIG. 5.
  • the chamfering process may be performed in the order of 2, 1 and 3, or may be performed in the order of 3, 2, and 1, but is not limited thereto.
  • the reinforcement process of the surface of the side surface of glass can be further performed as needed. This reinforcement process allows for a more uniform surface and excellent strength.
  • the reinforcing process according to the present invention includes a method of polishing the side of the glass with a polishing wheel, or etching the side of the glass with an etchant containing hydrofluoric acid.
  • a method of polishing with a polishing wheel is a method of polishing the side of the glass more evenly by contacting the side of the glass with the rotating polishing wheel after the inclined surface processing by the heating element is completed. As a result, fine cracks or the like present on the surface are polished to reinforce the side surface of the glass.
  • the polishing wheel may use a wheel made of abrasive particles such as cerium oxide. It is preferable that the size of abrasive grain is 5 micrometers or less from the viewpoint which fully demonstrates the side reinforcement effect of glass. The smaller the size of the abrasive particles, the higher the polishing accuracy is. Therefore, the lower limit is not particularly limited, but considering the process time or the like, about 0.01 ⁇ m can be used.
  • the rotation speed of the polishing wheel is not particularly limited and may be appropriately selected so that the side of the glass is sufficiently polished to obtain a desired level of strength, for example, it may be 1,000 to 10,000 rpm.
  • the method of etching using hydrofluoric acid is a method of applying an etching solution containing hydrofluoric acid to the side of the glass to etch the surface portion of the side of the glass.
  • an etchant containing hydrofluoric acid the side of the glass exhibits an embossed pattern and is etched to reinforce the surface.
  • the etchant including hydrofluoric acid is an aqueous hydrofluoric acid solution, and may further include components known in the art as free etching components such as hydrochloric acid, nitric acid, and sulfuric acid, in addition to hydrofluoric acid.
  • the time for etching the side of the glass with the etchant including hydrofluoric acid is not particularly limited, but for example, etching between 30 seconds and 10 minutes may increase the strength without excessively etching the side of the glass.
  • the temperature of the etching liquid containing hydrofluoric acid is not specifically limited, For example, it is preferable that it is 20-50 degreeC. If the temperature is lower than 20 °C process time is long and the etching may proceed inadequately, if the temperature is higher than 50 °C process time is short but the etching may proceed unevenly.
  • An etchant including hydrofluoric acid may be applied to the side of the glass in a manner known in the art, such as sprayed on the side of the glass or immersing the side of the glass in the etchant.
  • the heating element was brought into contact with the side edges of the glass substrate under the conditions described in Table 1 to perform a chamfering process.
  • the glass substrate used Corning's Gorilla Glass and its physical properties are shown in Table 2 below.
  • Table 2 shows the temperature distribution, workability, and measured elongation of the heating elements of the Examples and Comparative Examples. Elongation was judged by the average value of 50 or more sheets of tempered glass.
  • the heating elements of the Examples and Comparative Examples were rotated under the conditions shown in Table 1, and then the temperature difference between the portion close to the induction coil and the portion far from the induction coil was measured using an optical temperature measuring instrument (pa21af11, Keller). Table 3 shows.
  • Elongation is an index for evaluating strength
  • two support spans spaced from both sides from the center of the substrate are installed in the lower part of the tempered glass substrates of the Examples and Comparative Examples, and the upper span is positioned above the center of the substrate. While applying, the distance (crosshead displacement) from the point where the upper span touches the window substrate to the point at which the window substrate is broken was measured and calculated according to Equation 2 below, and the results are shown in Table 3 below.
  • T is the thickness of the window substrate in mm
  • ⁇ is the crosshead displacement in mm
  • s is the distance between the support spans in mm.
  • the tempered glass of the embodiments performed according to the conditions of the chamfering method according to the present invention all exhibit a high elongation of 0.8% or more, the temperature distribution of the heating element is constant and the workability is significantly improved than the comparative examples You can see that.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Surface Treatment Of Glass (AREA)
PCT/KR2015/009770 2014-10-17 2015-09-17 유리의 면취 방법 WO2016060381A1 (ko)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2014-0140925 2014-10-17
KR1020140140925A KR102208307B1 (ko) 2014-10-17 2014-10-17 유리의 면취 방법

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022212683A1 (en) * 2021-04-01 2022-10-06 Corning Incorporated Heat chamfering apparatus and method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010049537A (ko) * 1999-06-14 2001-06-15 알프레드 엘. 미첼슨 유리판 가장자리 가공방법
JP2001294437A (ja) * 2000-04-13 2001-10-23 Sharp Corp 液晶表示装置のガラス基板の面取り方法およびその方法に用いる加熱器
KR20080100556A (ko) * 2007-05-14 2008-11-19 (주)성현 테크놀로지 소형박판유리 연삭방법
US20120006063A1 (en) * 2006-11-15 2012-01-12 Furukawa Electric Co., Ltd. Method of manufacturing glass substrate
KR20140017855A (ko) * 2012-08-01 2014-02-12 주식회사 라미넥스 고주파 유도 가열기를 이용한 유리 모서리 가공 방법 및 장치

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7125319B2 (en) 2003-10-27 2006-10-24 Corning Incorporated Apparatus and method for grinding and/or polishing an edge of a glass sheet
WO2013099847A1 (ja) * 2011-12-28 2013-07-04 旭硝子株式会社 センサ一体型カバーガラスの製造方法、およびセンサ一体型カバーガラス
JP2015091610A (ja) * 2012-02-22 2015-05-14 旭硝子株式会社 ガラス板の端面処理方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010049537A (ko) * 1999-06-14 2001-06-15 알프레드 엘. 미첼슨 유리판 가장자리 가공방법
JP2001294437A (ja) * 2000-04-13 2001-10-23 Sharp Corp 液晶表示装置のガラス基板の面取り方法およびその方法に用いる加熱器
US20120006063A1 (en) * 2006-11-15 2012-01-12 Furukawa Electric Co., Ltd. Method of manufacturing glass substrate
KR20080100556A (ko) * 2007-05-14 2008-11-19 (주)성현 테크놀로지 소형박판유리 연삭방법
KR20140017855A (ko) * 2012-08-01 2014-02-12 주식회사 라미넥스 고주파 유도 가열기를 이용한 유리 모서리 가공 방법 및 장치

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022212683A1 (en) * 2021-04-01 2022-10-06 Corning Incorporated Heat chamfering apparatus and method

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TWI663132B (zh) 2019-06-21
KR20160045421A (ko) 2016-04-27
KR102208307B1 (ko) 2021-01-26
TW201623163A (zh) 2016-07-01

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