201034983 六、發明說明： 【發明所屬之技術領域】 本發明，係關於一種藉由溢流下拉（overflow down draw)法來製造板玻璃時所使用之玻璃成形裝置。 【先前技術】 液晶顯示器、電漿顯示器等平面顯示器（以下，稱為 「FPD」）之玻璃基板，係使用厚度例如薄至〇.5〜〇.7mm的 Ο 板玻璃。此FPD玻璃基板用之板玻璃為大尺寸者，例如第 1 代為 300x400mm，到了第 10 代，則為 2850x3050mm。 為了製造此種FPD玻璃基板用之板玻璃，最常使用溢 流下拉法。於溢流下拉法中，係藉由使熔融玻璃進入玻璃 成形裝置來連續地成形帶狀之玻璃帶（glass ribbon)。此 時，係將玻璃帶向下方拉下，藉由該拉下速度來進行厚度 的調整。然後，以特定長度切斷玻璃帶，來製造板玻璃。 ❹ 例如，於曰本特開2003 — 313034號公報，記載有如圖 6所示之玻璃成形裝置1〇。此玻璃成形裝置1〇，具備有延 伸於特定方向之剖面楔狀的本體U、與用以控制沿著本體 11之兩壁面11a所流下之熔融玻璃之寬度的一對導件Η。 _藉由玻璃成形裴置10所成形之玻璃帶15，如圖7A所 不，較佳為至寬度方向之兩端部的耳部l5a具有均一之厚 a然而，於專利文獻i所記載之玻璃成形裝置，當玻 2成形裝置1〇之前端部分(下端部分)之熔融玻璃的黏度例 為5〇,〇〇〇1^.8(1，1〇〇。〇左右時，如圖7輯示，耳部153 3 201034983 有時候會起伏於玻璃帶之長邊方向並分岔成又狀。如此若 耳部15a分岔，則將會有可能發生玻璃帶15之形狀不良、 或成為裂縫的原因而對連續作業造成影響之虞。 為了防止上述情形發；Φ，古4 生有效辦法係將玻璃成形裝置 1〇之前端部分的熔融玻璃的黏度降低至例如為 ，〇〇〇Pa S(1，2GGC)左右以提升溶融破璃之流動性但是若 因為如此為了降低熔融玻璃的減，而提升熔融玻璃的溫 :時，則將會導致主要以耐火碑所構成之高價的玻璃成形 裝置10的壽命下降。 【發明内容】 本發明，係有鐵於此種情事，目的在於提供一種即使 :融玻璃之黏度較高’亦可成形耳部形狀穩定之玻璃帶的 玻璃成形裝置。 本發明之發明人為了達成上述目的，係著眼於導件之 :狀’看是否能藉由改進導件的形狀，來抑制上述耳部之 岔亦即，於專利文獻記載之玻璃成形裝置10,如 圖6所示’由於導件12具有矩形的外形，其下端部呈平坦 大’因此熔融玻璃會在接觸導件的狀態下自本體脫離。因 此，本發明之發明人便想到要改善它。 本發明係由此種觀點所完成者，提供一種玻璃成形裝 糸八備具有形成有供給槽（用以供給熔融玻璃）之上面及 引導從上述供給槽沿著上述上面向該供給槽之兩側溢 而自上述上面之兩端部流下之溶融玻璃使其熔合之一對 201034983201034983 VI. Description of the Invention: [Technical Field] The present invention relates to a glass forming apparatus used for manufacturing sheet glass by an overflow down draw method. [Prior Art] A glass substrate of a flat panel display (hereinafter referred to as "FPD") such as a liquid crystal display or a plasma display is made of a slab glass having a thickness of, for example, 〇.5 to 〇.7 mm. The plate glass for this FPD glass substrate is large, for example, the first generation is 300x400mm, and the 10th generation is 2850x3050mm. In order to manufacture a sheet glass for such an FPD glass substrate, an overflow down-draw method is most often used. In the overflow down-draw method, a ribbon-shaped glass ribbon is continuously formed by bringing molten glass into a glass forming apparatus. At this time, the glass ribbon is pulled downward, and the thickness is adjusted by the pulling speed. Then, the glass ribbon is cut at a specific length to produce a plate glass. For example, Japanese Laid-Open Patent Publication No. 2003-313034 discloses a glass forming apparatus 1 as shown in Fig. 6. The glass forming apparatus 1A includes a main body U having a wedge-shaped cross section extending in a specific direction, and a pair of guides 用以 for controlling the width of the molten glass flowing down along the wall surfaces 11a of the main body 11. The glass ribbon 15 formed by the glass forming device 10, as shown in Fig. 7A, preferably has a uniform thickness to the ears 15a at both ends in the width direction. However, the glass described in Patent Document i In the forming apparatus, when the viscosity of the molten glass of the front end portion (lower end portion) of the glass 2 forming device 1 is 5 〇, 〇〇〇1^.8 (1,1 〇〇. 〇, as shown in FIG. 7 Ear 153 3 201034983 Sometimes it will undulate in the direction of the long side of the glass ribbon and split into a shape. If the ear 15a branches, the shape of the glass ribbon 15 may be bad, or it may become a crack. In order to prevent the above-mentioned situation, the effective method of reducing the viscosity of the molten glass at the front end portion of the glass forming device 1 is, for example, 〇〇〇Pa S(1, 2GGC) to improve the fluidity of the molten glass, but if the temperature of the molten glass is raised in order to reduce the decrease of the molten glass, the life of the expensive glass forming apparatus 10 mainly composed of the fireproof monument will be caused. [Description of the Invention] The present invention In order to achieve the above object, the inventors of the present invention have focused on the purpose of providing a glass forming device which can form a glass ribbon having a stable ear shape even if the viscosity of the molten glass is high. The shape of the piece is seen to be able to suppress the above-mentioned ear portion by improving the shape of the guide member, that is, the glass forming device 10 described in the patent document, as shown in Fig. 6, because the guide member 12 has a rectangular shape. The lower end portion is flat and large', so that the molten glass is detached from the body in the state of contacting the guide. Therefore, the inventors of the present invention have thought of improving it. The present invention is completed by such a viewpoint, providing a glass The forming device has a top surface on which a supply groove (for supplying molten glass) is formed, and a molten glass that flows from the supply groove along the upper surface of the upper side of the supply groove and flows from both end portions of the upper surface One of its fusions to 201034983
壁面的本體、輿互相對A 興互相對向用以控制沿著上述 之熔融玻璃之寬度的—對導 ！面肌下 對¥件，且上述一對導件各別從互 相對向之方向觀看時，具有以上述一對壁面之下端部彼此 相交所形成之稜線上之點作 艰之點作為㈣之朝下變尖的外形。 根據上述之構成，由於導件具有朝下變尖之外形，宜 頂點係位於一對壁面之下端部彼此相交所形成之稜線上:、 =導件接觸之部分的炼融破璃，會一面減少與導件的 Ο 置 φ流向上迷之稜'線，最後在接觸量為零的狀陣 下自本體脫離。因此，悛點分t 〜 、3玻璃的黏度即使相對較高，亦 可成形耳部之形狀穩定的玻璃帶。 【實施方式】 以下，-面參照圖式，一面說明用以實施本發明之實 :形態。另，以下之説明僅是本發明之一例，本發明並不 受到此等之限制。 〇 如圖1及圖2所示，本發明之一實施形態的玻璃成形 裝置1，具備有延伸於水平面上 丁田上之一方向的本體2、與固定 於此本體2的一對導件3。η #丄 " 耵等忏3。另，於本說明書中，為了方便進 ΓΓ，係將本體2之延伸方向（於圖1中為左右方向）稱為 讀方向，而與此正交之水平方向則稱為左右方向，特別 是將圖1之左側稱為前方，圖1之右側稱為後方。 本體2’係呈朝下變尖之五邊形楔狀（寬度狹窄之本壘 狀）的剖面形狀，具有與水平面平行之長方形的上面21、與 自此上面21左右方向之兩端部向下方的一對壁面23。另， 5 201034983 上面21，無須與水平面平行，例如义 高的傾斜面或曲面。 了為向别方呈前低後 在上面21 ’形成有延伸於前後方向之供給 此供給槽22之長度設定成與上面21曰 、The body of the wall and the cymbal are opposite each other to control the width of the molten glass along the above-mentioned guide! When the facial muscles are opposite to each other, and the pair of the guide members are viewed from opposite directions, the point on the ridge line formed by the intersection of the lower end portions of the pair of wall faces is difficult (4) The shape of the tip is sharpened. According to the above configuration, since the guide member has a shape which is pointed downward toward the lower side, it is preferable that the apex is located on the ridge line formed by the intersection of the lower end portions of the pair of wall surfaces: = the fused glass of the portion where the guide member contacts is reduced With the guide member φ flow upwards the edge of the line, and finally detached from the body under the array of zero contact. Therefore, even if the viscosity of the glass points t 〜 3 is relatively high, the glass ribbon of the shape of the ear can be formed. [Embodiment] Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings. In addition, the following description is only an example of the invention, and the invention is not limited thereto. As shown in Fig. 1 and Fig. 2, a glass forming apparatus 1 according to an embodiment of the present invention includes a main body 2 extending in one direction on a horizontal surface and a pair of guides 3 fixed to the main body 2. η #丄 " 耵等忏3. In addition, in the present specification, in order to facilitate the advancement, the extending direction of the main body 2 (the horizontal direction in FIG. 1) is referred to as a reading direction, and the horizontal direction orthogonal thereto is referred to as a left-right direction, in particular, The left side of Fig. 1 is called the front side, and the right side of Fig. 1 is called the rear side. The main body 2' has a cross-sectional shape of a pentagonal wedge shape (a narrow width of the base shape) which is tapered downward, and has a rectangular upper surface 21 parallel to the horizontal plane and lower ends of the upper and lower sides of the upper 21 direction. A pair of wall faces 23. In addition, 5 201034983 above 21, does not need to be parallel to the horizontal plane, such as the inclined surface or curved surface of the high. In order to provide the front side to the other side, the upper 21' is formed with a feed extending in the front-rear direction. The length of the supply groove 22 is set to be 21 曰,
MiB ^ 之長度相同程度或稍 微短些’供給槽22之開口❿係 彤。v w 叫z 1小一圈之長方 二二供給槽22之底面22b為具有朝向前方上升之斜率 艾斜面。另，底面22b亦可為朝前方彎曲向上之曲面。 又，供給槽22無須為具有底面22b 夂钊面呈〕字形者，例 如亦可為剖面呈V字形者。 係從本體2之後方透過未圖示之供給管將炼融玻璃$ 供給至供給槽22。因此，若從未圖示之供給管將炼融玻璃 5供給至供給槽22内’⑽融玻璃5將會—邊向前方流經 供給槽22内，一邊自供給槽22沿著上面2"益出於左右兩 側，然後自上面21的左右兩端部流下。 一對壁面23’係引導上面21之左右兩端部所流下之溶 融玻璃5使其溶合者，其等之下端部彼此相交，藉此形成 延伸於前後方向之稜線24。具體而言，一對壁面23，分別 係由自上面21之左端部或右端部垂直垂下之垂直面23&、 與自此垂直面23a之下端部以互相靠近的方式向内側傾斜 之傾斜面23b所構成。因此，自上面21之左右兩端部流下 之熔融玻璃5 ’會分別沿著壁面23流下而在稜線24之下方 溶合。藉此使帶狀之玻璃帶5 0連續成形。 一對導件3，於前後方向互相對向，係用以控制沿著兩 壁面23所流下之熔融玻璃5的寬度且於前後方向呈爲平之 201034983 板狀者。一對導件3，其等之内側面（朝另一方之導件3側 之面）3a係被設置在與供給槽22之開口 22&之前後方向之 紐邊致的位置。又，一對導件3，如圖3所示，當從前後 方向來看時，分別具有以壁面23彼此相交之棱線24上之 點作為頂點朝下變尖的外形。亦即，各導件3之朝下變尖 的則知33，係位於棱線24上。於本實施形態中，各導件3 之外形，係呈上侧之3邊互相垂直相交，下側之4邊為傾 斜之左右對稱的七邊形。The length of MiB ^ is the same or slightly shorter than the opening of the supply tank 22. v w is called z 1 small one-turn rectangular The second bottom 22b of the supply groove 22 has a slope that rises toward the front. In addition, the bottom surface 22b may also be a curved surface that is curved upward toward the front. Further, the supply groove 22 does not need to have a shape having a bottom surface 22b, and may have a V-shaped cross section. The smelting glass $ is supplied from the main body 2 to the supply tank 22 through a supply pipe (not shown). Therefore, if the molten glass 5 is supplied into the supply tank 22 from a supply pipe (not shown), '(10) the molten glass 5 will flow forward through the supply tank 22, and from the supply tank 22 along the upper side 2" From the left and right sides, then flow from the left and right ends of the upper 21. The pair of wall faces 23' guide the molten glass 5 which flows down at the left and right end portions of the upper surface 21 to be fused, and the lower end portions thereof intersect each other, thereby forming the ridge line 24 extending in the front-rear direction. Specifically, the pair of wall faces 23 are respectively a vertical surface 23 & vertically falling from the left end portion or the right end portion of the upper surface 21, and an inclined surface 23b inclined inward from the lower end portion of the vertical surface 23a so as to be adjacent to each other. Composition. Therefore, the molten glass 5' flowing down from both the left and right ends of the upper surface 21 flows down along the wall surface 23 and is fused below the ridge line 24. Thereby, the strip-shaped glass ribbon 50 is continuously formed. The pair of guide members 3 are opposed to each other in the front-rear direction, and are used to control the width of the molten glass 5 flowing down the two wall faces 23 and are flat in the front-rear direction. The inner side surface (the side facing the other side guide member 3) 3a of the pair of guide members 3 is disposed at a position which is adjacent to the opening 22& of the supply groove 22 in the front and rear directions. Further, as shown in Fig. 3, the pair of guide members 3 each have a shape in which the point on the ridge line 24 where the wall faces 23 intersect each other as a vertex that is pointed downward as viewed from the front-rear direction. That is, the guides 33 of the respective guide members 3 which are pointed downward are located on the ridge line 24. In the present embodiment, each of the guide members 3 has a shape in which the three sides on the upper side are perpendicular to each other, and the four sides on the lower side are in a heptagon shape which is symmetrical to the left and right.
更詳而吕之，各導件3，具有沿著一對之各壁面幻延 伸於上下方向的縱導件部32、與位於本體2之上面Μ上而 ，縱導件部32之上端部連接的横導件部31。並且，縱導件 P 匕3有/α著垂直面23a之垂直部32a、與沿著傾斜面 23b的傾斜部32b。又，傾斜部奶之下部的特定區域（從前 端33起該傾斜部似之Μ左右）係朝向稜線24呈尖狀， 使得縱導件部32越往下方越細。 接著’說明本實施形態之玻璃成形裝置i的作用。 首先，為了進行比較’參照圖4B來說明圖6所示之以 在玻璃成形裝Ϊ 10的作用。於以往之玻璃成形裝置1〇，由 ^ 之下端部⑵呈平坦狀，因此熔融玻螭會在接觸 12的狀下自本體11脫離。料別的看法，則與導 二2㈣之部分的熔融玻璃，不僅會沿著壁面而直 '、沿者導件12流下，如圖4B中箭頭b所示，所流下之 ^向並非沿著壁面lu的方向，而是梢微拉開的方向。因 ，與導件12接觸之部分的㈣玻璃的軌跡L2，較玻麟成 7 201034983 形裝置10之中央部的執跡1^開。 相對於此，於本實施形態之玻璃成形裝置丨，如圖4A 所示，由於朝下變尖之導件3的前端33係位於稜線24上， 因此與導件接觸之部分的熔融玻璃5，會—面減少與導件3 的接觸量，一面流向稜線24。亦即，與導件3接觸之部分 的熔融玻璃5，由於會沿著導件3之傾斜部32b流下，因此 會如圖4A中箭頭a所示般朝向稜線24收聚。然後，與導 件3接觸之部分的熔融玻璃5’最後會在與導件3之接觸量 為零的狀態下自本體2脫離’熔融玻璃5的點度例 如即使相對地高達100,000Pa· s(1〇5〇t)左右，亦可^圖 7A所示般成形耳部5〇a之形狀穩定的玻璃帶。 另’於上述實施形態中，雖然導件3的外形(從前後方 向觀看日m七邊形，但是導件3的外形，只要是以棱線24 上之點作為頂點之朝下變尖者即可，並無特別限定。例如 亦可如圖5A所示，傾斜部奶整體向稜線24呈尖狀，導 件3的外形呈五邊形。 「部或整體向稜線More specifically, each of the guide members 3 has a vertical guide portion 32 extending in the vertical direction along each of the pair of wall surfaces, and is disposed on the upper surface of the main body 2 and connected to the upper end portion of the vertical guide portion 32. The horizontal guide portion 31. Further, the vertical guide P 匕3 has /α the vertical portion 32a of the vertical surface 23a and the inclined portion 32b along the inclined surface 23b. Further, the specific region of the lower portion of the inclined portion milk (the inclined portion as viewed from the front end 33) is pointed toward the ridge line 24, so that the vertical guide portion 32 becomes thinner as it goes downward. Next, the action of the glass forming apparatus i of the present embodiment will be described. First, for the purpose of comparison, the action of the glass forming member 10 shown in Fig. 6 will be described with reference to Fig. 4B. In the conventional glass forming apparatus 1b, since the lower end portion (2) is flat, the molten glass sheet is detached from the body 11 in the form of the contact 12. In other words, the molten glass of the part of Guide 2 (4) will not only flow along the wall surface, but also flow along the guide member 12, as indicated by the arrow b in FIG. 4B, and the flow direction is not along the wall surface. The direction of lu, but the direction in which the tip is slightly pulled. Therefore, the trajectory L2 of the (four) glass which is in contact with the guide 12 is higher than that of the central portion of the Bolivia 7 201034983 device 10. On the other hand, in the glass forming apparatus 本 of the present embodiment, as shown in FIG. 4A, since the front end 33 of the guide 3 which is pointed downward is located on the ridge line 24, the molten glass 5 which is in contact with the guide member is The meeting-side reduces the amount of contact with the guide 3 and flows toward the ridge 24. That is, since the molten glass 5 which is in contact with the guide 3 flows down along the inclined portion 32b of the guide 3, it is collected toward the ridge 24 as indicated by an arrow a in Fig. 4A. Then, the molten glass 5' of the portion in contact with the guide 3 is finally detached from the body 2 in a state where the contact amount with the guide 3 is zero. For example, the degree of the molten glass 5 is relatively high, for example, up to 100,000 Pa·s ( A glass ribbon having a stable shape of the ear 5〇a can be formed as shown in Fig. 7A, as shown in Fig. 7A. Further, in the above-described embodiment, the outer shape of the guide member 3 (the shape of the guide member 3 is seen from the front-rear direction, but the outer shape of the guide member 3 is as long as the point on the ridge line 24 is the apex. For example, as shown in Fig. 5A, the entire inclined milk may have a pointed shape toward the ridge line 24, and the outer shape of the guide member 3 may have a pentagon shape.
Ui ^ „ ------ ·. 工穴狀的：η 狀，無須為銳利的三角形，也丨上+ π , ^ 例如亦可如圖5Β所示般外側土 呈圓弧狀。 32a 並且，縱導件部3 2， 至傾斜部32b呈連續 例如亦可如圖5C所示，從垂直部 之曲線’且越往下方越細。 内侧 例如 ’等仵°"無須為前後方向呈扁平板狀者，口要是 面3"與壁面23相交的部分與壁面23正交者:;可。 ，導件部3亦可與圖6所示之以往玻璃成形裝置则 201034983 樣地’呈導件部31之中央部向外側凸出之形狀，或者是呈 外側面向外側凸起之三維形狀。 本發明’特別適合於製造FPD玻璃基板用之板玻璃時 所使用之玻璃成形裝置。 【圖式簡單說明】 圖1 ’係顯示本發明一實施形態之玻璃成形裝置的前視 圖。 〇 圖2’係顯示圖1之玻璃成形裝置的立體圖。 圖3 ’係圖1之玻璃成形裝置的側面剖面圖。 圖4A ’係圖3之主要部分放大圖，圖4B，係以往玻璃 成形裝置之主要部分放大剖面圖。 圖5A〜5C係變形例之玻璃成形裝置的側面剖面圖。 圖6 ’係顯示以往玻璃成形裝置之立體圖。 圖7A ’係正常形狀之玻璃帶的剖面圖，圖7B係耳部 Q 形狀不良之玻璃帶的剖面圖。 【主要元件符號說明】 1 玻璃成形裝置 2 本體 21 上面 22 供給槽 23 壁面 23a 垂直面 9 201034983 23b 傾斜面 24 稜線 3 導件 31 橫導件部 32 縱導件部 32a 垂直部 32b 傾斜部 5 熔融玻璃 50 玻璃帶 50a 耳部Ui ^ „ ------ ·. Work-like: η-shaped, without sharp triangles, also + π, ^ For example, as shown in Figure 5, the outer soil is arc-shaped. 32a and The longitudinal guide portion 32 and the inclined portion 32b are continuous, for example, as shown in Fig. 5C, and are curved from the curve of the vertical portion and are as thin as possible. The inner side is, for example, 'equal" In the case of a flat plate, the face 3" the portion intersecting the wall surface 23 is orthogonal to the wall surface 23: Yes, the guide portion 3 may also be a guide member with the conventional glass forming device shown in Fig. 6 201034983 The central portion of the portion 31 has a shape that protrudes outward, or has a three-dimensional shape that protrudes outward from the outer side. The present invention is particularly suitable for a glass forming apparatus used for manufacturing sheet glass for an FPD glass substrate. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a front view showing a glass forming apparatus according to an embodiment of the present invention. Fig. 2' is a perspective view showing the glass forming apparatus of Fig. 1. Fig. 3 is a side sectional view showing the glass forming apparatus of Fig. 1. Figure 4A is an enlarged view of the main part of Figure 3, Figure 4B, Fig. 5A to 5C are side cross-sectional views of a glass forming apparatus according to a modification. Fig. 6' is a perspective view showing a conventional glass forming apparatus. Fig. 7A' is a section of a glass ribbon of a normal shape. Fig. 7B is a cross-sectional view of a glass ribbon having a poor shape of the ear portion Q. [Description of main component symbols] 1 Glass forming device 2 Main body 21 Upper surface 22 Supply groove 23 Wall surface 23a Vertical surface 9 201034983 23b Inclined surface 24 Ridge line 3 Guide 31 Cross member portion 32 longitudinal guide portion 32a vertical portion 32b inclined portion 5 molten glass 50 glass ribbon 50a ear portion