1265914 玖、發明說明 . , ^ , .. r ' (發明說明應敘明··發明所屬之技術領域、先前技術、內容、實施方式及圖式簡單說明) (一） 發明所屬之技術領域 本發明涉及一種浮法玻璃帶製造時使玻璃熔液分配至浮 法設備之供應通道中所用之裝置，其具有至少一截止活門 (Tweel)，其在其表面至少以區域方式而設有一含有貴金屬 -合金之層。 (二） 先前技術 特殊玻璃用之小的浮法設備以唯一之截止活門（Twe e 1 )來 操作，藉此截止活門使繼續流動至浮動池之玻璃熔液數量 受到調整。 石灰-碳酸氫鈉-浮法設備用之供應通道通常具有空著的 玻璃熔液表面。在特殊玻璃（特別是硼矽酸鹽玻璃）中由於 玻璃成份選擇性地蒸發而使玻璃熔液不允許有空著的表面 。在此種供應通道中，玻璃熔液之液位狀態大約在供應通 道之覆蓋唇（所謂浸入式覆蓋件）之下邊緣上方20至50mm 處。 各截止活門在供應通道中以可垂直調整之方式而懸掛著 。在通道寬度固定時可藉由截止活門-高度（通道底部至截 止活門下邊緣之距離）之改變來使通道橫切面改變且在玻璃 黏度相同時可調整該流經截止活門下方之玻璃熔液之數量 〇 截止活門通常由耐火材料所構成。淤泥澆注之已燒結之 一6- 1265914 卵石玻璃陶瓷（Fused Silica)通常可用於該截止活門中。 該截止活門下邊緣之形狀對浮法玻璃帶之品質（失真、氣 泡等等）有很大之影響。該截止活門之下側通常是平坦的， 但亦可以凸出以拱形方式來構成。 右該截止活門由卵石玻璃陶瓷（Fused Silica)所構成， 則其下側（即，導入至玻璃熔液中之下側）會強烈地受到熱 玻璃熔液所腐蝕。由於此種腐蝕而使截止活門之表面幾何 形狀改變（腐蝕外形（p r ο Π 1 e )，其在截止活門之中央受到 強大之剝蝕，外側則受到較輕微之剝鈾）。 浮法玻璃之玻璃品質隨著截止活門之逐漸增加之運行時 間而劣化（失真、氣泡等等）。特別是在高熔點之硼矽酸鹽 玻璃（無鹼或少鹼者）或鋁矽酸鹽玻璃中，由卵石玻璃陶瓷 所構成之截止活門之保溫時間很短。在高熔點之侵蝕性玻 璃中，吾人試圖藉由塗佈一由貴金屬合金（例如，Pt或Pt/Rh) 所構成之陶瓷-截止活門來提高該保溫時間。保溫時間特別 是在玻璃熔液之一般溫度1 2 0 0至1 4 0 0 °C時是足夠的。但此 種塗層之缺點是：可浮動之大部份之玻璃之材料在溫度是 12 00至1 400Υ時會受到強烈之浸濕。特別是在高熔點之特 殊玻璃（例如，硼矽酸鹽玻璃）中，流經該截止活門下方之 玻璃之溫度是在1 250至135(^(:之範圍中。這樣所產生之 強烈之浸濕性對該浮法玻璃帶之表面特性有不良之影響， 其品質因此亦會變差。 (三）發明內容 本發明之目的是提供一種上述形式之裝置，其中該玻璃 - 7 - 1265914 熔液只輕微地使該截止活門之表面浸濕且因此使該浮法玻 璃帶之品質不會受到不良影響。 本發明中上述目的以下述方式達成：該截止活門之塗層 具有鉑及金。 利用該截止活門之塗層，則特別是在1 200至1 400GC中 在與該玻璃熔液相接觸時該截止活門可達成一種小的沾濕 性。該截止活門在該玻璃熔液之合金區域中只須整個稍微 沾濕即可，這樣可使該浮法玻璃帶有較高之表面品質。 依據本發明一種較佳之實施形式，該塗層具有2至8 Wt.%(較佳是5 Wt.%)之金。含有5 Wt.%之鉑之合金可最佳 化地滿足上述之需求。在商用之大部份之玻璃中該沾濕性 都很小。這在1 200至140(^(:之溫度範圍中亦適用於特殊 之玻璃中，這在實驗室硏究時已藉由較大之接觸角而顯示 在各合金面上。 由於成本之故，一種具有下述特徵之形式是有利的：該 截止活門具有一由陶瓷（較佳是已燒結之卵石玻璃陶瓷 (Fused Si 1 ica))所構成之基体。該截止活門因此具有足夠 之穩定性且昂貴之金屬塗層只限於該截止活門之該絕對必 要之表面。 該截止活門之構造形式之特徵是：該截止活門以長方六 面体之形式構成且在面向該玻璃熔液之下邊緣上形成凸出 之拱形，其中該拱形在玻璃熔液之流動方向中對準且該截 止活門之寬度在該供應通道之整個寬度中延伸，該外層以 袋形方式構成且容納該基体，使該截止活門利用一軸承螺 -8 - 1265914 栓而懸掛在一懸掛裝置上，其中該軸承螺栓在該供應通道 之整個寬度中延伸，且該袋形之外層經由一連接板而與該 截止活門之軸承螺栓相連。因此，利用該截止活門之懸掛 方式同樣亦可連接該基体和該層。 在較大之浮法設備中之設計方式是：通道中配置至少二 個截止活門，利用該面向浮動池之截止活門可對該玻璃熔 液之離開該供應通道之液位狀態進行調整且利用該遠離浮 動池之截止活門可使供應通道中之玻璃熔液中斷且釋出。 例如，可決定Z e b r a -角度或波形（特別是微細波形）以作 爲該浮法玻璃帶之表面品質用之量度’該表面品質可利用 本發明之特徵而大大地改良。 (四）實施方式 本發明以下將依據圖式中之實施例來描述。 如第1圖所示，玻璃在玻璃熔液盆1 〇中熔化且輸送至 一供應通道1 1，其中已精煉之玻璃熔液1 2以一種轉向溢 流唇1 3之截止活門20來分配。另一截止活門30以偏離該 溢流唇1 3之方式而配置在供應通道1 1中，藉此截止活門 30可使玻璃通量在供應通道11中釋出或中斷。 溢流唇1 3配置在浮動池之起始壁1 4上，浮動池以底部 元件1 5來表示且容納一由流體錫所構成之液體1 6。玻璃 熔液1 2經由浮動池中之溢流唇1 3而流至流體錫上且形成 一種連續之玻璃帶1 8，玻璃帶1 8經由未顯示之拉出滾筒 而由浮動池中拉出。溢流唇1 3及浮動池之間之過渡區藉由 覆蓋件1 7來覆蓋。 -9 ~ 1265914 截止活門20或30顯示在第2圖之透視圖中。一種長方 六面体形式之基体2 1由淤泥澆注之已燒結之卵石玻璃陶瓷 (Fused Si 1 ica)所構成。 基体2 1之下邊緣形成凸出之拱形，此種拱形在玻璃熔液 1 2之流動方向中對準。該截止活門20在該供應通道1 1之 整個寬度中延伸且可利用一種懸掛裝置2 5而垂直地在該供 應通道11之覆蓋唇中調整。該基体21設有一由鉑合金所 構成之袋形之層22。該層22可由一種塗層來形成，例如 ，可藉由粉狀材料之燒結或火焰濺鍍，或藉由電解式塗佈 或在一種片上鍍鉑等方式來形成。 由第2圖中又可知：各連接板23，24以單件方式而與該 層相連接。各連接板23，24又可耦合至一軸承螺栓26， 其可在基体21和該懸掛裝置2 5之間形成一種連接。該袋 形之層22經由該截止活門20在玻璃熔液12中之最大浸入 深度而延伸。同樣之構造亦可具有該截止活門30以使玻璃 熔液1 2釋出或中斷。 利用該層22可使該截止活門20相對於玻璃熔液1 2之沾 濕性被降低，這樣可使浮法玻璃帶之表面品質獲得改良。 (五）圖式簡單說明 第1圖供應通道之過渡區中浮法玻璃製造用之浮法設 備，其具有二個至浮動池之截止活門。 第2圖一以鉑合金（含5 Wt. %之金）所形成之層來塗佈 之截止活門（其由卵石玻璃陶瓷所構成）之透視圖。 -10 - 1265914 主要部分之代表符號說明 1〇 玻璃熔液盆 11 供應通道 12 玻璃熔液 13 溢流唇 14 起始壁 15 底部元件 16 液體 17 覆蓋件 18 玻璃帶 20,30 截止活門 21 基體 22 層 23，2 4 連接板 26 軸承螺栓1265914 玖, 发明说明. , ^ , .. r ' (Description of the invention should be described in the technical field, prior art, content, embodiment and schematic description of the invention) (I) Technical Field to which the Invention Is Along The invention relates to a device for dispensing a glass melt into a supply channel of a float apparatus during manufacture of a float glass ribbon, which has at least one shut-off shutter (Tweel) provided on its surface at least in a regional manner with a precious metal-alloy Layer. (ii) Prior art Small float equipment for special glass operates with a single cut-off flap (Twe e 1 ), whereby the shut-off flap adjusts the amount of glass melt that continues to flow to the float bath. Supply channels for lime-sodium bicarbonate-float equipment typically have an empty glass melt surface. In special glass (especially borosilicate glass), the glass melt is not allowed to have an empty surface due to the selective evaporation of the glass component. In such a supply passage, the liquid level of the glass melt is approximately 20 to 50 mm above the edge below the cover lip of the supply passage (so-called immersion cover). Each of the cut-off valves is suspended in the supply passage in a vertically adjustable manner. When the channel width is fixed, the cross-section of the channel can be changed by changing the valve-height (the distance from the bottom of the channel to the lower edge of the shut-off valve) and the glass melt flowing under the cut-off valve can be adjusted when the glass viscosity is the same. The number of cut-off valves is usually made up of refractory materials. Sludge-cast sintered 6-1226514 Pesed Silica is commonly used in the cut-off valve. The shape of the lower edge of the shutoff valve has a large effect on the quality of the float glass ribbon (distortion, air bubbles, etc.). The underside of the shutoff flap is generally flat, but may also be convexly formed in an arched manner. The right cut-off valve is made of Fused Silica, and the lower side (i.e., introduced to the lower side of the glass melt) is strongly corroded by the hot glass melt. Due to this corrosion, the geometry of the surface of the cut-off valve is changed (corrosion profile (p r ο Π 1 e ), which is strongly ablated at the center of the cut-off valve, and the outer side is slightly stripped of uranium). The glass quality of the float glass deteriorates with the increasing operating time of the cut-off valve (distortion, bubbles, etc.). In particular, in high-melting borosilicate glass (without alkali or alkalinity) or aluminosilicate glass, the holding time of the cut-off shutter composed of pebble glass ceramics is short. In high-melting, aggressive glass, we have attempted to increase this holding time by coating a ceramic-cut valve made of a precious metal alloy (for example, Pt or Pt/Rh). The holding time is sufficient especially at the general temperature of the glass melt of 1 2 0 0 to 1 400 °C. However, the disadvantage of such a coating is that the majority of the glass material that can float is strongly wetted at temperatures between 12 and 1 400 。. Especially in special glass with high melting point (for example, borosilicate glass), the temperature of the glass flowing under the cutoff valve is in the range of 1 250 to 135 (^(:). The wetness has an adverse effect on the surface characteristics of the float glass ribbon, and the quality thereof is also deteriorated. (III) SUMMARY OF THE INVENTION An object of the present invention is to provide a device of the above type, wherein the glass - 7 - 1265914 melt The surface of the shutoff shutter is only slightly wetted and thus the quality of the float glass ribbon is not adversely affected. The above object is achieved in the present invention in that the coating of the shutoff shutter has platinum and gold. The cut-off shutter, in particular in the case of contact with the glass melt in 1 200 to 1 400 GC, achieves a small wettability. The shut-off valve is only in the alloy region of the glass melt. It is necessary to slightly wet the whole, so that the float glass can have a higher surface quality. According to a preferred embodiment of the invention, the coating has 2 to 8 Wt.% (preferably 5 Wt.%). Gold. Contains 5 Wt .% of the platinum alloy can best meet the above requirements. This wettability is very small in most commercial glass. This is also applicable in the temperature range of 1 200 to 140 (^ (: In the special glass, this has been shown on the surface of each alloy by a large contact angle in the laboratory. Due to the cost, a form having the following characteristics is advantageous: the cutoff valve has a The base body of the ceramic (preferably sintered glass ceramics (Fused Si 1 ica)). The cut-off shutter thus has sufficient stability and an expensive metal coating is limited to the absolutely necessary surface of the shut-off valve. The configuration of the cutoff flap is characterized in that the cutoff flap is formed in the form of a rectangular parallelepiped and forms a convex arch on the lower edge facing the glass melt, wherein the arch is in the flow direction of the glass melt Aligning and extending the width of the shutoff flap over the entire width of the supply passage, the outer layer being formed in a bag shape and accommodating the base body, so that the cutoff flap is suspended by a bearing screw -8 - 1265914 Above, wherein the bearing bolt extends in the entire width of the supply passage, and the bag-shaped outer layer is connected to the bearing bolt of the cut-off shutter via a connecting plate. Therefore, the hanging manner using the cut-off shutter can also be connected The base body and the layer are designed in a larger float apparatus: at least two cut-off flaps are arranged in the passage, and the liquid level of the glass melt leaving the supply passage can be performed by the cut-off flap facing the floating pool Adjusting and utilizing the shutoff shutter away from the floating cell can interrupt and release the glass melt in the supply channel. For example, the Zebra-angle or waveform (especially the fine waveform) can be determined as the surface quality of the float glass ribbon. The measure 'this surface quality can be greatly improved by utilizing the features of the present invention. (4) Embodiments The present invention will be described below based on embodiments in the drawings. As shown in Fig. 1, the glass is melted in a glass frit basin 1 and transported to a supply passage 1 1, wherein the refined glass melt 12 is dispensed by a shutoff shutter 20 that turns to the overflow lip 13. Another shutoff shutter 30 is disposed in the supply passage 11 in a manner deviating from the overflow lip 13, whereby the shutoff shutter 30 allows the glass flux to be released or interrupted in the supply passage 11. The overflow lip 13 is disposed on the starting wall 14 of the floating pool, which is represented by the bottom member 15 and houses a liquid 16 composed of fluid tin. The glass melt 1 2 flows onto the fluid tin via the overflow lip 13 in the floating cell and forms a continuous glass ribbon 18. The glass ribbon 18 is pulled out of the floating bath via a pull-out drum, not shown. The transition between the overflow lip 13 and the floating pool is covered by a cover member 17. -9 ~ 1265914 The cutoff valve 20 or 30 is shown in the perspective view of Fig. 2. A base body 2 1 in the form of a rectangular hexahedron is composed of a cemented pebble glass ceramic (Fused Si 1 ica). The lower edge of the base body 2 1 is formed into a convex arch shape which is aligned in the flow direction of the glass melt 12. The shutoff shutter 20 extends over the entire width of the supply passage 11 and can be vertically adjusted in the covering lip of the supply passage 11 by means of a suspension device 25. The base 21 is provided with a bag-shaped layer 22 of a platinum alloy. The layer 22 can be formed from a coating, for example, by sintering or flame sputtering of a powdered material, or by electrolytic coating or platinum plating on a sheet. It is also apparent from Fig. 2 that the respective connecting plates 23, 24 are connected to the layer in a single piece. Each of the webs 23, 24, in turn, can be coupled to a bearing bolt 26 which forms a connection between the base body 21 and the suspension means 25. The pocket-shaped layer 22 extends through the maximum immersion depth of the shutoff shutter 20 in the glass melt 12. The same configuration may also have the shutoff shutter 30 to release or interrupt the glass melt 12. The use of this layer 22 reduces the wettability of the shutoff shutter 20 relative to the glass melt 12, which improves the surface quality of the float glass ribbon. (5) Brief description of the drawings Fig. 1 A float apparatus for manufacturing float glass in the transition zone of the supply passage, which has two cut-off shutters to the floating pool. Fig. 2 is a perspective view of a cutoff shutter (which is composed of pebble glass ceramic) coated with a layer of platinum alloy (containing 5 Wt. % of gold). -10 - 1265914 Symbol of the main part Description 1 Glass frit basin 11 Supply channel 12 Glass melt 13 Overflow lip 14 Starting wall 15 Bottom element 16 Liquid 17 Covering piece Glass strip 20, 30 Cut-off valve 21 Base 22 Layer 23, 2 4 connecting plate 26 bearing bolt