200835658 九、發明說明 【發明所屬之技術領域】 本發明，是關於利用浮式法之玻璃薄板之製造方法， 更詳細而言，是將附著於玻璃帶之熔融錫等之異物予以去 除之製造玻璃薄板的方法、去除該熔融錫等之異物的方法 、以用以去除該熔融錫等之異物的裝置。 【先前技術】 對於建築用板玻璃、車用板玻璃、以及顯示器用板玻 璃等之玻璃薄板，正追求有更高品質化及低成本化。阻礙 高品質化與低成本化的成因有許多，其中有不少是因爲熔 融錫浴（浮式浴）之熔融錫附著於玻璃薄板產生錫或錫氧化 物等而造成問題。 利用浮式法之玻璃薄板在製造上，是使熔融玻璃在熔 融錫浴的熔融錫表面上成形爲連續的薄板狀，成爲預定寬 幅之呈連續的玻璃薄板（以下，稱之爲玻璃帶）而從熔融錫 表面拉出，然後再切斷成預定的大小而成爲玻璃薄板。此 時，玻璃帶之拉出，一般是藉由被稱爲提升輥（lift out roller)的輥子將玻璃帶上提來進行。以下將存在有該提升 輥的區域稱之爲提升區域。所拉出的玻璃帶其次在被稱之 爲徐冷窯（lehr)的徐冷製程下進行徐冷。以下將該徐冷區 域稱之爲窯區域；將在該窯區域用以支撐搬運玻璃帶的輥 子稱之爲窯輥子。浮式浴中的熔融錫，由於易於氧化’故 浮式浴中的環境氣體被保持在還元性環境氣體中。提升區 -5- 200835658 域一般亦被保持在還元性環境氣體中。 於上述玻璃薄板之製造過程中，熔融錫容易附著於從 熔融錫表面所拉出的玻璃帶的下表面。提升輥，雖然並不 是用來去除附著在玻璃帶下表面的熔融錫等爲其目的，但 藉由輥子表面接觸於玻璃帶下表面，使得附著在玻璃帶下 表面的熔融錫朝輥子表面移動，因此具有去除附著在玻璃 帶下表面的熔融錫之作用（請參照專利文獻1)。但是，由 提升輥進行熔融錫之去除並不充分，玻璃帶下表面仍易於 殘留熔融錫。又，提升輥，其材料爲鐵或陶瓷所成，未必 會接觸到玻璃帶之全面。再者，附著於提升輥之熔融錫雖 從輥子表面被去除，但仍殘留在輥子表面亦不少，殘留的 熔融錫亦有造成再附著於玻璃帶下表面之情形。亦會有殘 留在玻璃帶之熔融錫更進一步污染窯輥子之情形。 殘留在玻璃帶表面的熔融錫易於氧化，由於產生的氧 化錫的融點極高，故一旦凝固接著於玻璃帶表面時就難以 將之去除。此外，除了氧化錫以外，起因於浮式浴內之環 境氣體中的不純物、熔融錫、或是玻璃中的不純物等也會 產生硫化物等的錫化合物。在提升區域所去除的熔融錫或 是錫化合物的混合物被稱之爲浮渣（dross)。當此類異物一 直附著於玻璃帶而被冷卻時，要將此異物從玻璃薄板去除 就會變得十分困難。 如此地附著於玻璃帶下表面的錫或是氧化錫等之異物 ，會成爲缺點而成爲玻璃薄板之品質降低及生產成品率降 低之原因。依情形而定，由於有時候對於徐冷後的玻璃帶 -6 - 200835658 或是玻璃薄板必須加以去除該異物，因此亦有另新增設置 去除該異物之製程，而造成更進一步的成本增加。又，殘 留在玻璃帶表面或是輥子表面的錫或是氧化錫，亦會傷及 玻璃帶表面，再者起因於該損傷而在徐冷以及之後的製程 中破裂，亦會造成更進一步生產的成品率降低之原因。 專利文獻1 :日本特開平1 1 -3 3 5 1 27號公報。 【發明內容】 [發明所要解決之問題] 本發明，爲有鑑於上述而發明，其目的在於：在玻璃 帶處於高溫狀態之階段（亦即，爲主要異物之錫，處於熔 融狀態下之階段），將附著於玻璃帶表面之異物直接從該 表面去除。又，在此階段，由於玻璃帶表面比較軟，擦取 接觸於玻璃帶表面之異物的擦取（去除）構件，必須是具有 耐熱性，並且是與玻璃帶表面沒有縫隙地能夠柔軟接觸者 [發明解決問題之技術手段] 本發明，是藉由抵接於玻璃帶表面的去除構件，從玻 璃帶表面直接將附著於玻璃帶表面之熔融錫等異物予以去 除’來作爲其特徵，而且是關於利用浮式法之玻璃薄板之 製造方法、從玻璃帶表面將上述異物去除之方法、以及適 於此等方法之上述異物的去除裝置之如下的發明。 (1 )針對於藉由浮式法製造玻璃薄板的方法，將由耐 200835658 熱纖維薄板所形成的去除構件抵接於由熔融錫浴所拉出且 處於該錫的熔融溫度範圍之玻璃帶的表面，將附著在玻璃 帶表面的熔融錫等之異物擦掃並去除，作爲其特徵之玻璃 薄板之製造方法。 (2) 如上述（1)之製造方法，其中上述去除構件是處於 非氧化性環境氣體中。 (3) 如上述（1)或是（2)之製造方法，其中上述耐熱纖維 薄板，是選自於碳纖維與氧化矽纖維之至少一種所形成的 毛氈狀的薄板、或是織布乃至不織布狀的薄板。 (4) 如上述（1)、（2)或（3)之製造方法，其中，以彈性力 或氣體壓力將上述去除構件推壓於玻璃帶的表面。 (5) 如上述（1)、（2)、（3)或（4)所記載之玻璃薄板之製 造方法，其中，使上述去除構件抵接於玻璃帶的下表面。 (6) 針對於藉由浮式法製造玻璃薄板的過程中，從由 熔融錫浴所拉出且處於該錫的熔融溫度範圍之玻璃帶的表 面，將附著在該表面的熔融錫等之異物去除的方法，將由 耐熱纖維薄板所形成的去除構件抵接於上述玻璃帶的表面 來將上述熔融錫等之異物從玻璃帶的表面擦掃並去除，作 爲其特徵之熔融錫等之異物的去除方法。 (7) 如上述（6)之去除方法，其中上述去除構件是處於 非氧化性環境氣體中。 (8) 針對於藉由浮式法製造玻璃薄板的過程中，從由 熔融錫浴所拉出且處於該錫的熔融溫度範圍之玻璃帶的表 面，將附著在該表面的熔融錫等之異物去除的去除裝置， -8- 200835658 上述去除裝置，係具備有：抵接於玻璃帶的表面將上 述熔融錫等之異物從玻璃帶表面擦掃並去除的去除構件； 以及支撐該去除構件的固定構件，並成爲朝向玻璃帶的寬 度方向延伸的長條體，且該去除構件是由耐熱纖維薄板所 形成，作爲其特徵之熔融錫等之異物去除的去除裝置。 (9) 如上述（8)之去除裝置，其中上述固定構件，具有 將上述去除構件推壓於玻璃帶的表面的彈性體。 (10) 如上述（8)之去除裝置，其中上述固定構件，具有 氣體通路，其用於以氣體壓力將上述去除構件推壓到玻璃 帶的表面。 (11) 如上述（8)、（9)或（10)所記載之去除裝置，其中上 述去除構件，在被固定構件所支撐的狀態下成爲山型，且 山型的頂部抵接於玻璃帶的表面。 (12) 如上述（8)、（9)、（10)或（11)所記載之去除裝置， 其中耐熱纖維薄板，是選自於碳纖維與氧化矽纖維之至少 一種所形成的毛氈狀的薄板、或是織布乃至不織布狀的薄 板0 [發明效果] 依據本發明之玻璃薄板之製造方法，藉由去除構件可 以將附著於玻璃帶表面之熔融錫等之異物直接從玻璃帶表 面去除。其結果，由去除構件至下游，由於也能夠減少附 著於接觸玻璃帶之輥子上的異物，所以可以防止異物從該 等輥子再次附著於玻璃帶表面。又，不僅可以去除附著在 -9- 200835658 玻璃帶之下表面的異物，藉由將去除構件設置於玻璃帶上 表面’也可以去除掉附著在玻璃帶上表面之異物（從浮式 浴的上部掉落下的磚屑或其他之異物）。 藉由以上的效果，可以減少由附著於玻璃帶表面之錫 或氧化錫等之異物所起因之玻璃薄板的缺點，且由附著於 輥子之異物所起因之玻璃帶表面的損傷亦變少，故能夠使 玻璃薄板高品質化並降低製造經費。 【實施方式】 以下，依圖面（第1〜6圖），說明本發明之實施形態。 第1圖，是顯示於本發明之實施形態下之去除裝置的斷面 圖；第2圖，是顯示包含本發明之實施形態下之去除裝置 之玻璃薄板製造設備的斷面圖；第3〜5圖，是分別顯示於 另一實施形態下之去除裝置的斷面圖；第6圖，是顯示讓 去除裝置進行水平移動時之一例。又，於以下之說明，所 φ 謂下游，是以玻璃帶的移動方向爲基準，相反於熔融錫浴 之方向側（在第1圖中以C所示之箭頭的方向側），並將其 相反方向側稱爲上游。 於第1圖顯示其斷面之去除裝置7，爲用來去除附著於 " 玻璃帶3下表面之異物的裝置。在熔融錫浴上所成形的玻 璃帶3，是從熔融錫浴被拉出，往以C所示之方向移動。 去除裝置7，是由抵接於玻璃帶3下表面的去除構件4以及 支撐該去除構件的固定構件5所構成，去除構件4、固定構 件5皆爲朝向玻璃帶3的寬度方向（與紙面垂直之方向）延伸 -10- 200835658 的長條體。去除構件4是由耐熱纖維薄板所形成，去除構 件4之寬度方向（與長條體的長邊方向垂直正交的方向）兩 端部是被安裝於固定構件5，兩端部間呈山型（凸狀）隆起 ，其頂部抵接於玻璃帶3的下表面。固定構件5是方管狀的 長條體，其中空部D與去除構件4之呈山型隆起部分的內 部空間A是由貫通孔（或是切縫）B所連通。藉由將加壓氣 體導入於固定構件5的中空部D使去除構件4呈山型隆起 ，利用該膨脹壓可以調整對去除構件4之玻璃帶3的接觸壓 或是接觸面積。因此，去除構件4及固定構件5的端部以閉 塞著爲佳。去除構件4對固定構件5之固定，可以以螺絲鎖 固、黏貼、以擋板夾入等方式實施。附著於玻璃帶3下表 面之熔融錫等之異物，藉由去除構件4從玻璃帶3下表面去 除，被去除的異物，通常，掉落到去除構件4的上游側（玻 璃帶之進行方向C的相反側）。 第2圖，是顯示將上述般之去除裝置7設置於提升區域 之玻璃薄板製造設備的斷面圖。在利用浮式法之玻璃薄板 之製造方法中，主要由以下製程所構成：在沒有圖示出的 熔解窯中熔解原料製成熔融玻璃之製程、在熔融錫浴1之 熔融錫2上將熔融玻璃成形爲平板之製程、藉由提升輥8、 9、1 〇從熔融錫浴1拉出玻璃帶3之製程、利用窯區域1 2內 之窯輥子11 一面移動玻璃帶一面使玻璃帶3不會造成殘留 應變地進行徐冷之製程。此等之製程，以通常之設備即可 進行操作作業’並不會因去除裝置7之設置而有所影響。 於第2圖中，是將去除裝置7設置在提升區域最下游之提升 -11 - 200835658 輥1 0的下游側。 去除裝置7，是可以設置在上述製程之提升區域的任 意位置或是窯區域12內的上游部。在此，所謂窯區域12內 的上游部，是指在窯區域1 2內具有錫之融點以上之溫度的 區域（錫的熔融溫度區域）。提升區域通常是處於錫的熔融 溫度區域。因此，只要處於此溫度區域，去除裝置7，也 可以設置在：例如，提升輥8的上游側、提升輥8與9之間 、提升輥9與1 0之間、窯區域1 2內之最上游側之窯輥子1 1 的上游側、該窯輥子1 1與下一個窯輥子1 1之間等等。又， 去除裝置7也可以設在此等位置中之2處以上。 第3圖是第2圖之去除裝置7的放大斷面圖’除了另具 有板狀體6之外，是與第1圖所顯示者具有相同構成的去除 裝置。板狀體6，是被安裝在固定構件5上部的上游側，存 在於去除構件4之呈山型隆起的內部空間Α中，且從內面 支撐著去除構件4。板狀體6，係彈性地支撐去除構件4， 爲能夠調節去除構件4與玻璃帶3下表面在抵接時之壓力者 ，只要能夠支撐去除構件4，可以設置成連續於玻璃帶之 寬度方向的長條者，也可以斷續地設置。藉由改變板狀體 6的厚度可以調整抵接壓力。於第3圖之板狀體6，其J字 型之具有大致J字型之底邊部之曲率的部分爲抵接於去除 構件4之山型部的內側。 板狀體6係用以使去除構件4呈山型隆起，並可調整其 形狀而可以調整去除構件4對玻璃帶3的接觸面積。又，藉 由調整去除構件4之厚度方向的位置，利用去除構件4之厚 -12- 200835658 度方向的彈性可以調整去除構件4對玻璃帶3的接觸壓。又 ，由彈性體來構成板狀體6，利用板狀體6的彈性也可以調 整接觸面積或是接觸壓。第3圖是使用具有彈性之板狀體6 的例示。板狀體6也可以爲不具備有彈性者。板狀體6的斷 面形狀並不限於第3圖的形狀，具有矩形或是其他的形狀 亦可。第4圖是使用斷面爲大致矩形之板狀體6的例示。又 ，板狀體6也可以更進一步地安裝在固定構件5上部的下游 側，第5圖是在固定構件5上部的上游側以及下游側之兩方 安裝板狀體6之例示。在具備有此等板狀體6之去除裝置7 ，並非必要以氣體壓力將去除構件4隆起成山型。但是， 對於具備有此等板狀體6之去除裝置7亦是以氣體壓力將去 除構件4隆起成山型爲理想。此乃由於藉由氣體壓力可以 更易於調整接觸面積或是接觸壓力之故。 去除構件4，由於易於將熔融錫等彈撥開，以及對於 玻璃帶表面亦較易於將熔融錫等彈撥開，故藉由具備與玻 璃帶之相對速度，來擦掃（拭取）並去除玻璃帶表面的異物 。爲了有效地去除異物，去除構件與玻璃帶以具有相對速 度來抵接爲佳。玻璃帶以預定的行進速度（以下以Gv表示 )朝向第2圖之以C所示的行進方向移動，藉此，即便去除 構件4是被固定著，兩者爲具備有相對速度Gv而抵接著 。並且可以依所期望來改變該相對速度。要使相對速度慢 於Gv時，則讓去除構件4以更慢於Gv的速度朝向與玻璃 帶移動方向相同方向移動爲佳。要使相對速度快於Gv時 ，則讓去除構件4朝向與玻璃帶之移動方向爲相反方向進 -13- 200835658 行移動爲佳。又，也可以讓去除構件4往復移動於玻璃帶 之移動方向及相反方向。第6圖是顯示讓去除裝置進行水 平移動時之一例示。第6圖之去除裝置7，是被安裝在驅動 裝置15的驅動輸送帶13，並藉由固定在地面E上的驅動馬 達1 4，以相異於玻璃帶行進速度的速度，與玻璃帶3之行 進方向平行地進行往復者。 於本發明中，去除裝置並非僅限於圖示者。例如，可 以使用與提升輥同樣地以與玻璃帶之寬度方向平行的軸進 行旋轉的輥子狀的去除裝置，或是連續輸送帶狀的去除裝 置。作爲輥子狀的去除裝置，例如，可以使用具有：圓管 狀的固定構件以及設於該表面的耐熱纖維薄板的薄板層（ 去除構件）之輥子狀去除裝置。也可以於圓管狀的固定構 件設置貫通孔或是切縫，從固定構件供給氣體並對耐熱纖 維薄板之層施加氣體壓力。作爲連續輸送帶狀的去除裝置 者，例如，可以使用：以耐熱纖維薄板來構成由第6圖所 示之驅動裝置15所驅動的輸送帶13的表面，以此輸送帶作 爲去除構件，使之以抵接於玻璃帶表面之方式之去除裝置 。使此等去除裝置之輥子或是輸送帶以與玻璃帶具有相對 速度之方式進行驅動，來去除玻璃帶表面的異物爲理想。 去除構件，係以：及於玻璃帶寬度方向之大致全長’ 連續地抵接於玻璃帶爲佳。不過，並非僅限於此，若於玻 璃帶有容易附著異物之處所之情形時，也可以僅使之抵接 於該部分來使用。例如，在玻璃帶之寬度方向兩端部容易 附著異物之情形時，可使用僅抵接於該部分之去除構件。 -14- 200835658 又，去除構件係以抵接於玻璃帶之及於寬度方向之大致全 長且與玻璃帶行進方向垂直相交之方向爲理想。但是，並 不限於此，亦可相對於玻璃帶的行進方向，以呈直角以外 的角度使之抵接。 也可以將去除構件抵接於玻璃帶的上表面，來去除附 著於玻璃帶上表面的異物。例如，將去除構件朝向玻璃帶 的寬度方向進行驅動，可以使異物朝向玻璃帶之寬度方向 端部移動，並從玻璃帶上予以去除。又，異物附著於去除 構件之情形時，可以藉由以適當的間隔更換去除構件來去 除玻璃帶上表面的異物。 於本發明，去除構件是由耐熱纖維薄板所構成。作爲 耐熱纖維者，以可以耐750 °C的溫度（熔融玻璃之溫度）， 特別是可以耐約1 000°C之溫度之材料的纖維爲理想。具體 上，例如碳纖維、氧化矽纖維、氧化鋁纖維、碳化素纖維 、金屬纖維等之無機纖維，其中以碳纖維、氧化矽纖維爲 理想，特別是其硬度較低不易損傷玻璃帶，又可將熔融錫 彈除開的碳纖維爲理想。作爲纖維薄板者，以毛氈狀之薄 片或織布乃至於不織布狀的薄板爲理想。具體上，例如可 使用碳纖維的毛氈狀薄片（碳毛氈）或是碳纖維的織布（碳 布）等。耐熱纖維薄片以由不同材料之2種以上的無機纖維 所構成的纖維薄片亦可。又，碳纖維即使殘留在玻璃帶下 表面，在比較高溫的氧化環境氣體中，例如藉由在窯區域 的後半邰等會燃燒殆盡而消失，而不會成爲髒污等之缺失 ，由此點而言亦爲理想。 -15- 200835658 去除構件的厚度並沒有特別限定，爲了使之具有柔軟 性以在5腿以上爲理想。厚度的上限雖無特別限定，但在 後述之氣體供給之情形時，從對於氣體之壓力損失的觀點 而言以3 0mm、特別是1 5mm爲理想。針對於去除構件之形 成，可以僅以毛氈狀薄板、或是重疊複數的織布或是不織 布亦可，再者也可以是毛氈狀薄片或織布或不織布之組合 〇 去除構件，係抵接於從熔融錫浴拉出後之玻璃帶的表 面，且是抵接在位於錫之熔融溫度區域的玻璃帶表面。錫 的熔融溫度約爲23 0 °C。錫的熔融溫度區域，較典型是在 23 0 °C至23 0+ 1 0 °C之範圍。因此，去除構件抵接於玻璃帶 的位置，爲比該錫的融點還高的溫度區域。在該溫度區域 主要異物之錫爲處於液狀之溫度區域，所以藉由去除構件 可以容易地拭取異物。氧化錫等之高融點的異物通常由熔 融錫所支撐承載，因此可以容易地和熔融錫一起拭取。即 使沒有被熔融錫所支撐承載之高融點的異物，由於玻璃帶 的溫度高，所以藉由其不會強固地附著於玻璃帶表面，故 同樣地能夠將之拭取。如上述般地，提升區域通常是處於 錫之熔融溫度以上的溫度區域，而窯區域之上游區域通常 亦是處於錫之熔融溫度以上的溫度區域。因此，去除構件 是抵接於位在提升區域、或是窯區域之上游區域的玻璃帶 表面，其中特別是以抵接於位在提升區域之玻璃帶表面爲 理想。 去除構件的抵接位置即使是位於錫之熔融溫度區域， -16- 200835658 當高融點的異物（特別是氧化錫）較多時，則恐有難以將異 物予以拭取除去之虞。由於熔融錫容易被氧化，故在抵接 到去除構件之前，若再使異物之熔融錫的氧化持續進行並 非理想。因此，存在有玻璃帶的處，至少在去除構件的抵 接位置以及其上游的環境氣體，以處於還元性氣體環境或 是非活性氣體環境中爲理想（以下將此兩種環境氣體皆亦 稱之爲非氧化性環境氣體）。提升區域通常保持於與浮式 浴相同之還元性氣體環境中。又，窯區域上游部之流入提 升區域之氣體的部分通常是處於還元性氣體環境或是非活 性氣體環境。因此，去除構件的抵接位置只要是位於此等 區域，便可以認爲熔融錫的氧化是難以進行的。又，特別 是在窯區域上游，由於也恐成爲暫時性之氧化性環境氣體 之虞，因此藉由將還元性氣體對存在有玻璃帶之去除構件 的抵接位置以及其上游進行供給等，亦可以使其環境被保 持在非氧化性環境氣體中。 另一方面，如圖所示地，作爲去除裝置是以氣體壓力 使去除構件呈山型隆起之構造的去除裝置爲理想。此時， 使用從固定構件5導入於去除構件之內側A的加壓氣體。 此加壓氣體恐有與異物之熔融錫接觸之虞，因此該加壓氣 體是由非氧化性氣體（亦即，還元性氣體或是非活性氣體） 所構成爲理想。再者，若去除構件是由碳纖維等易於氧化 的材料所構成之情形時，該去除構件若處於氧化性環境並 不理想。從此觀點而言，亦可見上述加壓氣體要由非氧化 性氣體所構成大致是必須的。又，即使去除構件是處於還 -17- 200835658 元性環境氣體中，由於也會有暫時性之氧氣濃度上昇，所 以以使用還元性氣體作爲加壓氣體來防止去除構件之壽命 縮短爲理想。此等氣體供給壓力以考慮壓力損失來設定爲 理想。當氣體壓過低時，去除構件相對於玻璃帶表面之抵 接壓力變低，會有降低異物去除效果之虞。相反地，當過 高時，則附著於去除構件之異物恐會產生再附著於玻璃帶 表面之虞。作爲氣體供給量，雖可以依去除裝置之構造等 而有所變動，不過通常之情形，以每寬度方向長度lm爲 10〜100公升/分鐘爲適當。又，供給該供給量之氣體，亦 有冷卻去除構件或固定構件之效果。 非氧化性氣體或是非氧化性環境氣體中之氧氣濃度爲 1%以下，特別是lOOOppm以下爲理想。作爲還元性氣體 者，以氫、乙炔、或是具有此等之非活性氣體爲理想。作 爲非活性氣體者，以氮氣或是氬氣爲理想。還元性環境氣 體’是以與浮式浴之環境氣體相同之含有氫的氮氣環境氣 體爲理想。 在去除裝置中之固定構件的材料，並非僅限定於具有 耐熱性者。可由一般金屬、碳、陶瓷等材料所形成。較佳 是以不銹鋼等之金屬爲理想。安裝於固定構件上之板狀體 的材料，同樣地由耐熱性材料所形成，以金屬、碳、陶瓷 等爲理想。具有彈性的板狀體以不銹鋼等之金屬爲理想。 作爲不具有彈性的板狀體，也可以使用碳材等。 實施例 -18 - 200835658 爲了確認本發明之有效性，故製作了去除裝置’並將 該去除裝置配置在利用浮式法之玻璃薄板的製造設備內’ 進行了確認錫及氧化錫之去除效果的實驗。於實驗所利用 的去除裝置，是設置於：複數個提升輥當中之最靠近下游 之提升輥的徐冷窯側。去除構件，在玻璃薄板之製造期間 中的20日間，接觸於玻璃帶下表面之離一方端部20cm處（ 於玻璃帶之寬度方向的長度）。在此期間中，對經過去除 構件上之玻璃帶表面，在一般之品質檢查所利用的高輝度 光源下，以每2小時1次之頻率（合計檢查次數240次）進行 了目視檢查。 在此實驗所使用的去除構件，爲纖維狀碳，是使用商 標名 KRECA G FELT之 F-210G(製造廠商：株式會社 KUREHA)之厚度10mm、密度0.10g/cm3之毛氈狀者。將之 以成爲接觸於玻璃帶之部分的長度爲200mm、寬度爲 100mm之方式予以加工來使用。固定構件，是使用20mm 方形，厚度1.2mm之不銹鋼製的方管。板狀體，是將橫斷 面形狀爲矩形之高度50mm、厚度0.3mm，橫斷玻璃帶之寬 度方向的長度爲200mm之不銹鋼板，如第4圖所示地，使 之突出於固定構件之上部的熔融錫浴側來設置。在玻璃帶 與去除構件之擋接部，以氮氣（N2)作爲非活性氣體，利用 上述方管內部的空間以5公升/分鐘進行供給。用以供給非 活性氣體之固定構件的貫通孔，是以直徑3mm於玻璃帶 之寬幅方向爲1 〇mm之等間隔來設置。去除構件對固定構 件之固定，是將不銹鋼板抵靠於去除構件之左右端部來進 -19- 200835658 行。 實驗結果，並無見到玻璃帶下表面的錫及氧化錫之缺 點和損傷，而沒有利用去除裝置時之區域的錫及氧化錫缺 點則每平方公尺可發現到0 · 1個左右。由此，可以實際驗 證由於本發明之去除裝置藉由去除玻璃帶下表面的錫及氧 化錫之極高效果。又，不會有去除構件之摩耗、損傷，在 耐久性上亦無問題。 產業上之可利用性 本發明，由於可以去除附著在玻璃帶之熔融錫等異物 來製造高品質的玻璃薄板，故可以使用在藉由浮式法之玻 璃薄板的製造。 又，在此引用2006年12月8日申請日本專利之日本專 利申請案第2006-3 3 1 9 1 8號的專利說明書、申請專利範圍 、圖面及摘要的全部內容，擷取以作爲本發明之專利說明 A 書之揭示。 【圖式簡單說明】 第1圖，是於本發明之實施形態下之去除裝置的斷面 圖。 第2圖，是包含本發明之實施形態下之去除裝置之玻 璃薄板製造設備的斷面圖。 第3圖，是於另一實施形態下之去除裝置的斷面圖。 第4圖，是於另一實施形態下之去除裝置的斷面圖。 -20- 200835658 第5圖，是於另一實施形態下之去除裝置之斷面圖。 第6圖，是於另一實施形態下讓去除裝置進行水平移 動時之一例的斷面說明圖。 【主要元件符號說明】 1 _•熔融錫浴 2 :熔融錫 3 :玻璃帶 4 :去除構件 5 :固定構件 6 :板狀體 7 :去除裝置 8 ·提升率毘 9 :提升輥 1 〇 :提升輥 1 1 :窯輥子 12 :窯（區域） 1 3 :驅動輸送帶 1 4 :驅動馬達 1 5 :驅動裝置 A :在去除構件與固定構件之間並且及於玻璃帶之寬 度方向的空間 B :貫通孔 C ’·帶狀玻璃的行進方向 -21 - 200835658 D :空間 E :地面[Technical Field] The present invention relates to a method for producing a glass sheet by a floating method, and more particularly to a method for producing a glass obtained by removing foreign matters such as molten tin adhered to a glass ribbon. A method of a thin plate, a method of removing foreign matter such as molten tin, or a device for removing foreign matter such as molten tin. [Prior Art] Glass sheets such as glass for building, glass for vehicles, and glass for display are being pursued with higher quality and lower cost. There are many causes for hindering high quality and low cost, many of which are caused by the adhesion of molten tin of a molten tin bath (floating bath) to a thin glass plate to produce tin or tin oxide. In the production of the glass sheet by the floating method, the molten glass is formed into a continuous thin plate shape on the surface of the molten tin of the molten tin bath, and is a continuous glass sheet having a predetermined width (hereinafter referred to as a glass ribbon). It is pulled out from the surface of the molten tin, and then cut into a predetermined size to become a thin glass plate. At this time, the glass ribbon is pulled out, and the glass ribbon is generally lifted by a roller called a lift out roller. Hereinafter, the area where the lifting roller is present is referred to as a lifting area. The glass ribbon that was pulled out was secondarily cooled in a cold process called a cold kiln (lehr). Hereinafter, the cold zone is referred to as a kiln zone; the roller used to support the conveyance of the glass ribbon in the kiln zone is referred to as a kiln roller. The molten tin in the floating bath is kept in the regenerative ambient gas because it is easily oxidized. Lifting zone -5- 200835658 The domain is generally also kept in regenerative ambient gases. In the manufacturing process of the above glass sheet, the molten tin easily adheres to the lower surface of the glass ribbon drawn from the surface of the molten tin. The lifting roller is not intended to remove molten tin attached to the lower surface of the glass ribbon, but the surface of the roller is in contact with the lower surface of the glass ribbon, so that the molten tin attached to the lower surface of the glass ribbon moves toward the surface of the roller. Therefore, it has an action of removing molten tin adhering to the lower surface of the glass ribbon (refer to Patent Document 1). However, the removal of molten tin by the lift rolls is not sufficient, and the molten tin is likely to remain on the lower surface of the glass ribbon. Moreover, the lifting roller is made of iron or ceramic and does not necessarily touch the entire glass ribbon. Further, although the molten tin adhered to the lift roller is removed from the surface of the roller, it remains on the surface of the roller, and the residual molten tin also causes reattachment to the lower surface of the glass ribbon. There is also a situation in which the molten tin remaining in the glass ribbon further contaminates the kiln rolls. The molten tin remaining on the surface of the glass ribbon is apt to be oxidized, and since the generated tin oxide has a very high melting point, it is difficult to remove it once it is solidified on the surface of the glass ribbon. Further, in addition to tin oxide, a tin compound such as a sulfide may be generated from impurities in the ambient gas in the floating bath, molten tin, or impurities in the glass. The mixture of molten tin or tin compound removed in the elevated region is referred to as dross. When such foreign matter is continuously attached to the glass ribbon and cooled, it becomes very difficult to remove the foreign matter from the glass sheet. Such a solder adhered to the lower surface of the glass ribbon or a foreign material such as tin oxide is a disadvantage, and the quality of the glass sheet is lowered and the production yield is lowered. Depending on the situation, since the foreign material must be removed for the glass ribbon -6 - 200835658 or the glass sheet after the cold, there is also a new process for removing the foreign matter, resulting in further cost increase. Moreover, tin or tin oxide remaining on the surface of the glass ribbon or on the surface of the roller may also damage the surface of the glass ribbon, and the crack may be broken during the cold and subsequent processes due to the damage, which may cause further production. The reason for the decrease in yield. Patent Document 1: Japanese Laid-Open Patent Publication No. Hei 1 1 - 3 3 5 1 27. [Problem to be Solved by the Invention] The present invention has been made in view of the above, and an object thereof is to provide a stage in which a glass ribbon is in a high temperature state (that is, a tin which is a main foreign matter, in a molten state) The foreign matter attached to the surface of the glass ribbon is directly removed from the surface. Further, at this stage, since the surface of the glass ribbon is relatively soft, the wiping (removing) member that wipes the foreign matter contacting the surface of the glass ribbon must have heat resistance and can be softly contacted without a gap with the surface of the glass ribbon [ [Technical means for solving the problem] The present invention is characterized in that a foreign material such as molten tin adhered to the surface of a glass ribbon is directly removed from the surface of the glass ribbon by a member that abuts against the surface of the glass ribbon. The following invention of a method for producing a glass sheet by a floating method, a method for removing the foreign matter from the surface of the glass ribbon, and a device for removing the foreign matter suitable for the method. (1) A method of manufacturing a glass sheet by a floating method, abutting a removal member formed of a heat resistant sheet of 200835658 against a surface of a glass ribbon drawn from a molten tin bath and at a melting temperature range of the tin A method of producing a glass sheet characterized by rubbing and removing foreign matter such as molten tin adhered to the surface of the glass ribbon. (2) The method according to the above (1), wherein the removing member is in a non-oxidizing atmosphere. (3) The method of the above (1) or (2), wherein the heat-resistant fiber sheet is a felt-like sheet formed of at least one selected from the group consisting of carbon fibers and cerium oxide fibers, or a woven fabric or a non-woven fabric. Thin sheet. (4) The manufacturing method according to the above (1), (2) or (3), wherein the removing member is pressed against the surface of the glass ribbon by an elastic force or a gas pressure. (5) The method for producing a glass sheet according to the above aspect (1), wherein the removing member is brought into contact with a lower surface of the glass ribbon. (6) In the process of manufacturing a glass sheet by a floating method, foreign matter such as molten tin adhered to the surface of the glass ribbon which is pulled out from the molten tin bath and is in the melting temperature range of the tin In the removal method, the removal member formed of the heat-resistant fiber sheet is brought into contact with the surface of the glass ribbon, and the foreign matter such as the molten tin is wiped and removed from the surface of the glass ribbon, and the foreign matter such as molten tin is removed. method. (7) The removal method of (6) above, wherein the removing member is in a non-oxidizing atmosphere. (8) In the process of manufacturing a glass sheet by a floating method, foreign matter such as molten tin adhered to the surface of the glass ribbon which is pulled out from the molten tin bath and is in the melting temperature range of the tin Removal device for removal, -8-200835658 The removal device includes: a removal member that abuts the surface of the glass ribbon to wipe and remove foreign matter such as molten tin from the surface of the glass ribbon; and fixes the support member The member is an elongated body extending in the width direction of the glass ribbon, and the removing member is a device for removing foreign matter such as molten tin which is formed of a heat-resistant fiber sheet. (9) The removing device according to (8) above, wherein the fixing member has an elastic body that presses the removing member against a surface of the glass ribbon. (10) The removing device according to (8) above, wherein the fixing member has a gas passage for pressing the removing member to the surface of the glass ribbon by gas pressure. (11) The removal device according to (8), (9) or (10), wherein the removal member is a mountain type in a state of being supported by the fixing member, and the top of the mountain type abuts against the glass ribbon s surface. (12) The removal device according to the above (8), (9), (10), or (11), wherein the heat-resistant fiber sheet is a felt-like sheet formed of at least one selected from the group consisting of carbon fibers and cerium oxide fibers. Or a woven fabric or a non-woven fabric sheet 0 [Effect of the Invention] According to the method for producing a glass sheet of the present invention, foreign matter such as molten tin adhering to the surface of the glass ribbon can be directly removed from the surface of the glass ribbon by the removing member. As a result, since the foreign matter attached to the roller contacting the glass ribbon can be reduced from the removal member to the downstream, foreign matter can be prevented from adhering again to the surface of the glass ribbon from the rollers. Moreover, not only the foreign matter adhering to the surface under the -9-200835658 glass ribbon can be removed, but also the foreign matter attached to the upper surface of the glass ribbon can be removed by placing the removing member on the upper surface of the glass ribbon (from the upper portion of the floating bath) Falling bricks or other foreign matter). According to the above effects, it is possible to reduce the disadvantage of the glass thin plate caused by the foreign matter such as tin or tin oxide adhered to the surface of the glass ribbon, and the damage of the surface of the glass ribbon caused by the foreign matter adhering to the roller is also small. It is possible to improve the quality of glass sheets and reduce manufacturing costs. [Embodiment] Hereinafter, embodiments of the present invention will be described with reference to the drawings (Figs. 1 to 6). 1 is a cross-sectional view showing a removing device according to an embodiment of the present invention; and FIG. 2 is a cross-sectional view showing a glass sheet manufacturing apparatus including a removing device according to an embodiment of the present invention; Fig. 5 is a cross-sectional view showing a removing device respectively shown in another embodiment; and Fig. 6 is a view showing an example in which the removing device is horizontally moved. In the following description, φ is the downstream, which is based on the moving direction of the glass ribbon, and is opposite to the direction side of the molten tin bath (on the side of the arrow indicated by C in Fig. 1). The opposite direction side is called the upstream. The cross-section removing device 7 shown in Fig. 1 is a device for removing foreign matter adhering to the lower surface of the glass ribbon 3. The glass ribbon 3 formed on the molten tin bath is pulled out from the molten tin bath and moved in the direction indicated by C. The removing device 7 is composed of a removing member 4 that abuts against the lower surface of the glass ribbon 3 and a fixing member 5 that supports the removing member. The removing member 4 and the fixing member 5 are oriented in the width direction of the glass ribbon 3 (perpendicular to the paper surface). The direction) extends the long strip of -10- 200835658. The removal member 4 is formed of a heat-resistant fiber sheet, and both ends of the removal member 4 in the width direction (direction orthogonal to the longitudinal direction of the elongated body) are attached to the fixing member 5, and the both ends are mountain-shaped. (convex) ridges, the top of which abuts against the lower surface of the glass ribbon 3. The fixing member 5 is a square tubular elongated body in which the inner space A of the hollow portion D and the mountain-shaped raised portion of the removing member 4 is communicated by the through hole (or the slit) B. The removal member 4 is raised in a mountain shape by introducing the pressurized gas into the hollow portion D of the fixing member 5, and the contact pressure or the contact area with respect to the glass ribbon 3 of the removal member 4 can be adjusted by the expansion pressure. Therefore, it is preferable that the ends of the removing member 4 and the fixing member 5 are closed. The fixing member 4 is fixed to the fixing member 5, and can be implemented by screwing, pasting, and bucking. The foreign matter such as molten tin adhered to the lower surface of the glass ribbon 3 is removed from the lower surface of the glass ribbon 3 by the removing member 4, and the removed foreign matter is usually dropped to the upstream side of the removing member 4 (the direction in which the glass ribbon proceeds) The opposite side). Fig. 2 is a cross-sectional view showing a glass sheet manufacturing apparatus in which the above-described removal device 7 is placed in a lifting region. In the manufacturing method of the glass sheet by the floating method, it is mainly composed of a process of melting a raw material into a molten glass in a melting kiln not shown, and melting on the molten tin 2 of the molten tin bath 1. The glass is formed into a flat plate process, the process of pulling the glass ribbon 3 from the molten tin bath 1 by the lifting rolls 8, 9, 1 and 、, and the glass belt 3 is moved by the kiln roller 11 in the kiln area 1 2 so that the glass ribbon 3 is not Will cause residual strain to carry out the process of Xu cold. These processes can be operated by ordinary equipment and are not affected by the setting of the removal device 7. In Fig. 2, the removal device 7 is placed on the downstream side of the lift -11 - 200835658 roller 10 which is the most downstream of the lifting zone. The removal device 7 can be placed at any location in the lift zone of the process or upstream of the kiln zone 12. Here, the upstream portion in the kiln region 12 refers to a region (melting temperature region of tin) having a temperature equal to or higher than the melting point of tin in the kiln region 12. The elevated area is typically in the melting temperature region of the tin. Therefore, as long as it is in this temperature range, the removal device 7 can be disposed, for example, on the upstream side of the lift roller 8, between the lift rollers 8 and 9, between the lift rollers 9 and 10, and in the kiln region 12 The upstream side of the kiln roll 1 1 on the upstream side, the kiln roll 11 and the next kiln roll 11 and the like. Further, the removal device 7 may be provided at two or more of these positions. Fig. 3 is an enlarged cross-sectional view of the removing device 7 of Fig. 2, except for the plate-like body 6, which is the same as the one shown in Fig. 1. The plate-like body 6 is attached to the upstream side of the upper portion of the fixing member 5, and is present in the inner space of the mountain-shaped ridge of the removing member 4, and supports the removing member 4 from the inner surface. The plate-like body 6 elastically supports the removing member 4, and in order to adjust the pressure at which the removing member 4 and the lower surface of the glass ribbon 3 abut, as long as the removing member 4 can be supported, it can be disposed continuously in the width direction of the glass ribbon. The long strips can also be set intermittently. The abutment pressure can be adjusted by changing the thickness of the plate-like body 6. In the plate-like body 6 of Fig. 3, the J-shaped portion having the curvature of the bottom portion of the substantially J-shape is in contact with the inner side of the mountain portion of the removal member 4. The plate-like body 6 is for causing the removing member 4 to be mountain-shaped and can be adjusted in shape to adjust the contact area of the removing member 4 with respect to the glass ribbon 3. Further, by adjusting the position of the removal member 4 in the thickness direction, the contact pressure of the removal member 4 with respect to the glass ribbon 3 can be adjusted by the elasticity of the removal member 4 in the thickness direction of -12-200835658 degrees. Further, the plate-like body 6 is composed of an elastic body, and the contact area or the contact pressure can be adjusted by the elasticity of the plate-like body 6. Fig. 3 is an illustration of the use of the elastic plate member 6. The plate-like body 6 may also be non-elastic. The shape of the cut surface of the plate-like body 6 is not limited to the shape of Fig. 3, and may have a rectangular shape or another shape. Fig. 4 is an illustration of the use of a plate-like body 6 having a substantially rectangular cross section. Further, the plate-like body 6 may be further attached to the downstream side of the upper portion of the fixing member 5, and Fig. 5 is an illustration of the mounting of the plate-like body 6 on both the upstream side and the downstream side of the upper portion of the fixing member 5. In the removal device 7 having such a plate-like body 6, it is not necessary to bulge the removal member 4 into a mountain shape by gas pressure. However, it is preferable that the removing device 7 having such a plate-like body 6 is formed by a gas pressure to swell the removing member 4 into a mountain shape. This is because the gas contact pressure makes it easier to adjust the contact area or contact pressure. In the removal member 4, since the molten tin or the like is easily detached, and the surface of the glass ribbon is also easily detached from the molten tin, the glass ribbon is wiped (swapped) and removed by the relative speed with the glass ribbon. Foreign matter on the surface. In order to effectively remove the foreign matter, it is preferable that the removing member and the glass ribbon are abutted at a relative speed. The glass ribbon moves at a predetermined traveling speed (hereinafter referred to as Gv) toward the traveling direction indicated by C in FIG. 2, whereby even if the removing member 4 is fixed, both of them have the relative speed Gv and are resisted. . And the relative speed can be changed as desired. When the relative speed is slower than Gv, it is preferable that the removing member 4 is moved in the same direction as the moving direction of the glass ribbon at a speed slower than Gv. In order to make the relative speed faster than Gv, it is preferable to move the removal member 4 in a direction opposite to the direction in which the glass ribbon moves in the direction of -13-200835658. Further, the removing member 4 may be reciprocated in the moving direction and the opposite direction of the glass ribbon. Fig. 6 is a view showing an example of the horizontal movement of the removing device. The removing device 7 of Fig. 6 is mounted on the driving conveyor belt 13 of the driving device 15, and is driven by the driving motor 14 fixed on the ground E at a speed different from the traveling speed of the glass ribbon, and the glass ribbon 3 The direction of travel is repeated in parallel. In the present invention, the removing device is not limited to the one shown. For example, a roller-shaped removing device that rotates in an axis parallel to the width direction of the glass ribbon in the same manner as the lift roller or a belt-shaped removing device can be used. As the roller-shaped removing device, for example, a roller-shaped removing device having a circular tube-shaped fixing member and a thin plate layer (removing member) of the heat-resistant fiber sheet provided on the surface can be used. It is also possible to provide a through hole or a slit in the circular tubular fixing member, supply gas from the fixing member, and apply a gas pressure to the layer of the heat resistant fiber sheet. As the continuous belt-like removing device, for example, a surface of the conveying belt 13 driven by the driving device 15 shown in Fig. 6 can be formed by a heat-resistant fiber sheet, and the conveying belt can be used as a removing member. A removal device in a manner to abut the surface of the glass ribbon. It is desirable to drive the rollers or the conveyor belt of such a removal device to have a relative speed to the glass ribbon to remove foreign matter on the surface of the glass ribbon. It is preferable to remove the member so as to continuously contact the glass ribbon in a substantially full length ' in the width direction of the glass ribbon. However, it is not limited to this. If the glass has a place where foreign matter is easily attached, it may be used only by abutting it. For example, when foreign matter tends to adhere to both end portions in the width direction of the glass ribbon, a removal member that abuts only the portion can be used. Further, it is preferable that the removing member is in contact with the glass ribbon in a direction substantially perpendicular to the width direction and perpendicular to the traveling direction of the glass ribbon. However, the present invention is not limited thereto, and may be abutted at an angle other than a right angle with respect to the traveling direction of the glass ribbon. It is also possible to abut the removal member against the upper surface of the glass ribbon to remove foreign matter attached to the upper surface of the glass ribbon. For example, by driving the removal member in the width direction of the glass ribbon, the foreign matter can be moved toward the end portion in the width direction of the glass ribbon and removed from the glass ribbon. Further, when the foreign matter adheres to the removing member, the foreign matter on the upper surface of the glass ribbon can be removed by replacing the removing member at an appropriate interval. In the present invention, the removing member is composed of a heat-resistant fiber sheet. As the heat-resistant fiber, it is preferable to use a fiber which can withstand a temperature of 750 ° C (temperature of molten glass), particularly a material which can withstand a temperature of about 1 000 ° C. Specifically, for example, carbon fibers, cerium oxide fibers, alumina fibers, carbon fibers, metal fibers, and the like, among which carbon fibers and cerium oxide fibers are preferable, and particularly, the hardness is low, the glass ribbon is not damaged, and the glass ribbon can be melted. The carbon fiber removed by the tin bomb is ideal. As the fiber sheet, it is preferable to use a felt-like sheet or a woven fabric or a non-woven sheet. Specifically, for example, a felt-like sheet of carbon fiber (carbon felt) or a woven fabric of carbon fiber (carbon cloth) or the like can be used. The heat-resistant fiber sheet may be a fiber sheet composed of two or more kinds of inorganic fibers of different materials. Further, even if the carbon fiber remains on the lower surface of the glass ribbon, the relatively high-temperature oxidizing atmosphere gas is burned out in the latter half of the kiln region, for example, and disappears without being contaminated. It is also ideal. -15- 200835658 The thickness of the removing member is not particularly limited, and it is desirable to have flexibility in order to be more than 5 legs. The upper limit of the thickness is not particularly limited. However, in the case of gas supply to be described later, it is preferably 30 mm, particularly preferably 15 mm, from the viewpoint of pressure loss of the gas. For the formation of the removing member, only a felt-like thin plate or a plurality of woven fabrics or non-woven fabrics may be stacked, or a felt-like sheet or a combination of woven fabrics or non-woven fabrics may be used to remove the members. The surface of the glass ribbon after being pulled out from the molten tin bath is abutted against the surface of the glass ribbon located in the melting temperature region of tin. The melting temperature of tin is about 23 0 °C. The melting temperature region of tin is typically in the range of 23 0 ° C to 23 0 + 10 ° C. Therefore, the position at which the removing member abuts against the glass ribbon is a temperature region higher than the melting point of the tin. In this temperature region, the tin of the main foreign matter is in the liquid temperature region, so that the foreign matter can be easily wiped off by removing the member. The foreign matter having a high melting point such as tin oxide is usually supported by the molten tin, and thus can be easily wiped together with the molten tin. Even if the foreign matter which is not supported by the molten tin is high in melting point, since the temperature of the glass ribbon is high, it is not strongly adhered to the surface of the glass ribbon, so that it can be similarly wiped. As mentioned above, the elevated region is typically in a temperature region above the melting temperature of tin, and the upstream region of the kiln region is typically also in a temperature region above the melting temperature of tin. Therefore, the removal member abuts against the surface of the glass ribbon located in the elevated region or in the region upstream of the kiln region, wherein it is particularly desirable to abut the surface of the glass ribbon positioned in the elevated region. Even if the contact position of the removal member is in the melting temperature range of tin, -16-200835658 When there is a large amount of foreign matter (especially tin oxide) at a high melting point, it may be difficult to remove the foreign matter. Since the molten tin is easily oxidized, it is not preferable to continue the oxidation of the molten tin of the foreign matter before the member is brought into contact with the removing member. Therefore, there is a glass ribbon, at least in the abutting position of the removing member and the ambient gas upstream thereof, which is ideal in a regenerative gas environment or an inert gas environment (hereinafter both environmental gases are also referred to as It is a non-oxidizing environmental gas). The lift zone is typically maintained in the same regenerative gas environment as the floating bath. Further, the portion of the gas flowing into the lift region in the upstream portion of the kiln region is usually in a regenerative gas atmosphere or an inert gas atmosphere. Therefore, as long as the abutting position of the removing member is located in such a region, it is considered that the oxidation of the molten tin is difficult to proceed. Further, in particular, in the upstream of the kiln region, since it is also a temporary oxidizing atmosphere gas, the regenerative gas is supplied to the contact position of the glass ribbon removing member and the upstream thereof. It is possible to keep its environment in a non-oxidizing ambient gas. On the other hand, as shown in the figure, it is preferable that the removing means is a removing means having a structure in which the removing member is a mountain-shaped bulge by gas pressure. At this time, the pressurized gas introduced from the fixing member 5 to the inner side A of the removing member is used. Since the pressurized gas may be in contact with the molten tin of the foreign matter, the pressurized gas is preferably composed of a non-oxidizing gas (i.e., a regenerative gas or an inert gas). Further, when the removing member is made of a material which is easily oxidized such as carbon fiber, the removing member is not preferable in an oxidizing environment. From this point of view, it is also apparent that it is essential that the pressurized gas be composed of a non-oxidizing gas. Further, even if the removal member is in the gaseous environment of -17-200835658, since the temporary oxygen concentration is increased, it is preferable to use the regenerative gas as the pressurized gas to prevent the life of the removal member from being shortened. These gas supply pressures are set to be ideal in consideration of pressure loss. When the gas pressure is too low, the abutting pressure of the removing member with respect to the surface of the glass ribbon becomes low, which may reduce the foreign matter removing effect. Conversely, when it is too high, the foreign matter attached to the removing member may cause a flaw that reattaches to the surface of the glass ribbon. The gas supply amount may vary depending on the structure of the removal device, etc., but in general, the length lm in the width direction is preferably 10 to 100 liters/min. Further, the gas supplied to the supply amount also has the effect of cooling the removal member or the fixing member. The concentration of oxygen in the non-oxidizing gas or the non-oxidizing atmosphere is 1% or less, and particularly preferably 1000 ppm or less. As the regenerative gas, hydrogen, acetylene, or an inert gas having such an inert gas is preferable. As an inert gas, nitrogen or argon is preferred. The regenerative ambient gas is ideally a hydrogen-containing nitrogen atmosphere similar to the ambient gas of a floating bath. The material of the fixing member in the removal device is not limited to those having heat resistance. It can be formed from general metals, carbon, ceramics and other materials. Preferably, it is preferably a metal such as stainless steel. The material of the plate-like body attached to the fixing member is similarly formed of a heat-resistant material, and is preferably metal, carbon, ceramics or the like. The plate body having elasticity is preferably made of a metal such as stainless steel. As the plate-shaped body which does not have elasticity, a carbon material or the like can also be used. Example -18 - 200835658 In order to confirm the effectiveness of the present invention, a removal device was prepared and disposed in a manufacturing apparatus of a glass sheet using a floating method. The effect of removing tin and tin oxide was confirmed. experiment. The removal device used in the experiment was placed on the side of the quenching kiln which is closest to the downstream lifting roller among the plurality of lifting rollers. The removal member was brought into contact with the lower end surface of the glass ribbon at a distance of 20 cm from the one end of the glass ribbon (the length in the width direction of the glass ribbon). During this period, the surface of the glass ribbon passing through the removal member was visually inspected at a frequency of twice a hour (a total of 240 inspections) under a high-intensity light source used for general quality inspection. The removal member used in this experiment was a fibrous carbon, and was a felt having a thickness of 10 mm and a density of 0.10 g/cm3 using F-210G (manufactured by KUREHA Co., Ltd.) under the trade name KRECA G FELT. This was processed so as to have a length of 200 mm and a width of 100 mm which were in contact with the glass ribbon. The fixing member is a square tube made of stainless steel of 20 mm square and 1.2 mm thick. The plate-like body is a stainless steel plate having a cross-sectional shape of a rectangular height of 50 mm and a thickness of 0.3 mm and a length of 200 mm across the width direction of the glass ribbon, as shown in Fig. 4, so as to protrude from the fixing member. The upper part of the molten tin bath is provided. Nitrogen (N2) was used as an inert gas in the contact portion between the glass ribbon and the removing member, and the space inside the square tube was supplied at 5 liters/min. The through holes for the fixing members for supplying the inert gas are provided at equal intervals of 3 mm in the width direction of the glass ribbon at a width of 1 〇 mm. The fixing member is fixed to the fixing member by abutting the stainless steel plate against the left and right ends of the removing member to enter the line -19-200835658. As a result of the experiment, the defects and damage of tin and tin oxide on the lower surface of the glass ribbon were not observed, and the tin and tin oxide defects in the region where the removal device was not used were found to be about 0.1 per square meter. Thus, the extremely high effect of the removal device of the present invention by removing tin and tin oxide on the lower surface of the glass ribbon can be actually verified. Further, there is no wear and damage of the removal member, and there is no problem in durability. Industrial Applicability According to the present invention, since a high-quality glass sheet can be produced by removing foreign matter such as molten tin adhered to the glass ribbon, the production of a glass sheet by a floating method can be used. In addition, the entire contents of the patent specification, the scope of the patent application, the drawings and the abstract of the Japanese Patent Application No. 2006-3 3 1 9 18, filed on Dec. 8, 2006, the entire contents of The disclosure of the invention is disclosed in Book A. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing a removing device according to an embodiment of the present invention. Fig. 2 is a cross-sectional view showing a glass sheet manufacturing apparatus including a removing device according to an embodiment of the present invention. Fig. 3 is a cross-sectional view showing the removing device in another embodiment. Fig. 4 is a cross-sectional view showing the removing device in another embodiment. -20- 200835658 Fig. 5 is a cross-sectional view of the removing device in another embodiment. Fig. 6 is a cross-sectional explanatory view showing an example in which the removing device is horizontally moved in another embodiment. [Description of main component symbols] 1 _•Molten tin bath 2: Molten tin 3: Glass ribbon 4: Removal member 5: Fixing member 6: Plate-like body 7: Removal device 8 • Lifting rate ad 9: Lifting roller 1 〇: Lifting Roller 1 1 : Kiln Roller 12 : Kiln (Zone) 1 3 : Drive Conveyor Belt 1 4 : Drive Motor 1 5 : Drive A: Space B between the removal member and the fixing member and in the width direction of the glass ribbon: Through hole C '·direction of travel of the strip glass-21 - 200835658 D : space E : ground
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