JP4170632B2 - Firing furnace - Google Patents

Firing furnace Download PDF

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Publication number
JP4170632B2
JP4170632B2 JP2002030490A JP2002030490A JP4170632B2 JP 4170632 B2 JP4170632 B2 JP 4170632B2 JP 2002030490 A JP2002030490 A JP 2002030490A JP 2002030490 A JP2002030490 A JP 2002030490A JP 4170632 B2 JP4170632 B2 JP 4170632B2
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Japan
Prior art keywords
substrate
cooling
setter
firing furnace
cooling chamber
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JP2002030490A
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JP2003065678A (en
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吉秀 中尾
晃一 旭
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Dai Nippon Printing Co Ltd
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Dai Nippon Printing Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、ガラス基板に形成した構成要素を焼き固めるのに使用する焼成炉の技術分野に属し、特にプラズマディスプレイ用基板などの電子部品としてのガラス基板の焼成工程において好適に使用される焼成炉に関するものである。
【0002】
【従来の技術】
この種のガラス基板上に形成された構成要素を焼き固める焼成炉としては、例えば図1に示すタイプのものが一般的に使用されている。通常プラズマディスプレイ用基板として使用している高歪点ガラスの歪点は570℃であるのに対し、電極、誘電体、リブの焼成温度は500〜600℃程度であるため、焼成時にはより耐熱性の高いセッタ−Sの上にガラス基板Gを載せた状態で焼成を行っている。プラズマディスプレイ基板の焼成には、このセッタ−として結晶化ガラス板(例えば、日本電気硝子製「ネオセラムN−O」)が用いられている。
【0003】
図1に示す焼成炉では、まず焼成炉本体1の外部においてリフタ−コンベア2の上段位置にあるセッタ−Sの上にガラス基板Gが載せられる。そして、ガラス基板Gはセッタ−Sと共に入口コンベア3により焼成炉本体1における上段通路の中に導入され、そのままセッタ−Sと共にロ−ラコンベアで搬送されながら加熱部にて常温から500〜600℃程度のピ−ク温度まで加熱された後、徐冷部にて400℃程度にまで冷却される。次いで、上段通路の端まで搬送されたところでガラス基板Gはセッタ−Sと共にリフタ−コンベア4により下段通路に降下され、下段通路内をロ−ラコンベアで逆方向に搬送されながら冷却部にて常温まで戻される。ガラス基板Gを載せたセッタ−Sが出口まで到達すると、出口コンベア5によりリフタ−コンベア2に移し替えられ、そこで焼成を終えたガラス基板Gが除去される。そして、空になったセッタ−Sはリフタ−コンベア2で上段位置に移動し、ここで次のガラス基板Gが載置されて焼成工程が繰り返される。このタイプの焼成炉では、上段通路の天井および床にヒ−タ−が連続的に設置されており、これらのヒ−タ−により上記の如く焼成温度を管理するようになっている。
【0004】
【発明が解決しようとする課題】
上記したタイプの焼成炉においては、等速度で搬送する連続搬送方式が主流であるが、寸法精度を上げるため等の理由でタクト搬送を全工程にわたって、または、一部で採用している装置もある。いずれの焼成炉においても、基板の大型化、タクトアップ要求のため、装置は大型化するので、焼成プロセス時間の短縮が要求されている。ところが、昇温および均熱部は、形成された膜面の特性・品質を保つため、また、徐冷部は基板の寸法を安定化させ歪みを防ぐため、ある程度以上の短縮は不可能である。そこで、タクト短縮、装置の小型化には、徐冷後の冷却工程の短縮が必要となる。しかしながら、高温の基板を冷却すると、外周部の方が中央部より速く冷却が進むため、中央部が高温で外周部が低温という温度勾配が生じる。このような温度勾配になると、基盤中央部の膨張しようとする力と、外周部の収縮しようとする力によって基板が割れやすく、冷却速度を速くすることが難しいのが現状である。
【0005】
本発明は、上記のような事情に鑑みてなされたものであり、その目的とするところは、基板の冷却速度を上げることができる基板冷却装置を備えた焼成炉を提供することにある。
【0007】
【課題を解決するための手段】
本発明の焼成炉は、加熱部とその後に冷却部を備えた焼成炉本体の中を、耐熱性のセッタ−にガラス基板を載置した状態で搬送しながらそのガラス基板の焼成を行う焼成炉であって、前記冷却部は、冷却室からなり、耐熱性のセッタ−上で加熱処理された基板を、該耐熱性のセッタ−上に載せたまま、該冷却室内で冷却する基板冷却装置を有し、該基板冷却装置は、冷却室の下部中央に上向きにエアを吹き出す多孔板を設置するとともに、その多孔板以外のところには上向きにエアを吹き出す複数のスリットノズルを並べて配置したものであって、該冷却室内の搬送機構が、ガラス基板を載置した耐熱性のセッタ−を前のゾーンである該冷却室外から基板冷却装置上に搬入する動作、基板冷却装置の中央部付近にて一定時間揺動させる動作、揺動終了後に次のゾーンである該冷却室外へ搬出する動作を繰り返し行うと共に、揺動を行っている時のみ、前記多孔板および前記複数のスリットノズルからセッタ−の下面にエアを吹き付けてガラス基板を冷却することを特徴とする。
【0010】
本発明の焼成炉は、前記冷却室をセッタ−搬送方向に連続して複数備えており、各々の冷却室毎に揺動動作を制御することを特徴とする。
【0012】
【発明の実施の形態】
以下、本発明の実施の形態について図面を参照しながら説明する。
【0013】
図2は本発明に係る基板冷却装置の一例を示す概略断面図であり、この基板冷却装置は、図1に示すタイプの焼成炉における冷却部に使用されている。
【0014】
図1にて説明したように、セッタ−に載置された状態で加熱部及び徐冷部を通過してきたガラス基板は、冷却部にて常温まで戻されるが、図2は、基板Gを載せたセッタ−Sがロ−ラコンベア10で搬送され、冷却部の一つの区画(冷却室に相当)に停止した状態を示している。また、図3はセッタ−Sの下方に位置する送風機構の平面図である。図4は、基板冷却装置を備えた焼成炉冷却室27の一例を示す概略構成図である。図5は、加熱部と冷却部が上下に2組ある2階建て構造になっている本発明の焼成炉の一例を示す概略図である。
【0015】
図2及び図3に示すように、ロ−ラコンベア10上で停止しているセッタ−Sの下方には、セッタ−Sに向けて上向きにエアを吹き出す多孔板21が設置され、その多孔板21以外のところには上向きにエアを吹き出す複数のスリットノズル22が並んで配置されている。また、各スリットノズル22の間には複数個の排気孔23が所定間隔で設けられている。
【0016】
多孔板21は下方にダクト24が繋がれており、そのダクト24を通してブロアからエアが供給される。また、複数のスリットノズル22は下方で一つの給気用中継スペ−ス25に繋がっており、その給気用中継スペ−ス25が側方でダクトに繋がれ、そのダクトを通してブロアからエアが供給されるようになっている。また、排気孔23はスペ−ス25の下側の排気用中継スペ−ス26に繋がり、そこからダクトを通して排気されるようになっている。そして、各ダクトのダンパ−やブロアの周波数、エアの温度などを調整することで、多孔板21とスリットノズル22に対しそれぞれに風量や風速を調整できるようになっている。
【0017】
基板Gの冷却に際しては、セッタ−Sの下側に向け、多孔板21とスリットノズル22からエアを吹き出す。この時、基板Gの中央部が外周部と同じ速度もしくはより速く冷却されるように多孔板21とスリットノズル22の風量や風速の調整を行い、また供給されるエアの量に見合う分の排気を排気孔23を通して行う。
【0018】
このようにして基板を冷却することで、徐冷後の基板を数分で室温程度に冷却することが可能となった。また、上下からエアを吹き付けると、基板の上面には直接エアが当たり、表裏で冷却速度が異なるので基板に反りを生じるが、上記の装置ではセッタ−Sの下方からエアを吹き付けて基板Gを間接的に冷却するので、基板Gに反りが生じることがない。
【0019】
なお、本発明の焼成炉は上記の如き基板冷却装置を備えたものであるが、そのタクトや目標とする冷却温度によって、上記の如き基板冷却装置を複数連続して設けてもよい。
【0020】
そして、基板の中央部から冷却するために、基板の搬送はタクト搬送とし、各冷却装置の略中央部分に基板が搬送されたタイミングで冷却を行うようにするのが望ましい。また、スリットノズル22のある部分とない部分によって温度差が生じるのを防ぐためには、ロ−ラコンベア10により基板Gに対して前後方向に所定量の揺動運動を行うようにするとよい。
【0021】
すなわち、前のゾ−ンから送り込まれた基板載置状態のセッタ−は、基板冷却装置のほぼ真上に来たところで一時停止し、もしくは直ちに、基板冷却装置上で揺動運動に入る。揺動運動はセッタ−搬送方向に所定量、所定時間行う。揺動運転中にのみ、基板を載置したセッタ−の下面に基板冷却装置からエアをあて、基板中央部の温度が低くなるように冷却を行う。揺動が終了したと同時にエアを止め、セッタ−を次のゾ−ンに払い出す。すぐ後ろに次のセッタ−が来ている場合は、払い出すと同時に次のセッタ−を引き込み、揺動と冷却、払い出しを繰り返す。
【0022】
図4に示す冷却室27の搬送機構においては、前ゾ−ンから搬送されてきたセッタ−はあるタイミングで減速を開始し、折り返し点となるある位置で揺動運動に入るが、この時の減速のタイミングは在荷センサ−29、揺動の位置を決める前後の折り返し点については、在荷センサ−28、30によって規定する。揺動している間に、多孔板21およびスリットノズル22よりエアをセッタ−Sに吹き付け、セッタ−Sとその上のガラス基板Gを冷却する。揺動時間はタイマ−によって規定し、揺動時間がタイマ−設定値になったら、セッタ−を次のゾ−ンに搬送する。冷却室は連続的に複数設け、各々の冷却室に基板冷却装置と在荷センサ−を設置し、冷却室毎に制御することが好ましい。
【0023】
加熱部とその後に冷却部を備えた本発明の焼成炉は、図5に一例を示すように、加熱部と冷却部とを1組の連続した構成とし、上部と下部の各々に加熱部と冷却部を設けた、上下2組の2階建て構造とするのが好ましく、省スペ−ス化が図れるので、コストダウンに寄与し得る。
【0024】
以上、本発明の実施の形態について詳細に説明したが、本発明による基板冷却装置を使用した焼成炉は、上記実施の形態に何ら限定されるものではなく、本発明の趣旨を逸脱しない範囲において種々の変更が可能であることは当然のことである。
【0025】
【実施例】
ガラスの大きさ1460mm×1100mm、厚さ3mmの基板上に、電極を形成し、その上に誘電体層を形成した後、リブ形成材料を全面に塗布し、塗布したリブ形成材料を乾燥して膜厚180μmの乾燥膜を得た。次に、ドライフィルムレジスト(日本合成化学工業(株)製「NCP225」)を乾燥膜上にラミネ−トし、線幅80μm、ピッチ220μmのラインパタ−ンを有するフォトマスクを用いて紫外線露光し、露光後、現像して、線幅80μm、ピッチ220μmのレジストパタ−ンを形成した。続いて、研磨材料として褐色溶融アルミナ#1000を用いてサンドブラスト加工を行い、レジストパタ−ンから露出している不要部分を切削除去した後、レジストパタ−ンを剥離した。
【0026】
次に、本発明の加熱部と冷却部が上下に2組ある2階建て構造になっている焼成炉を用いて、前記のリブパタ−ンを形成した基板を、セッタ−上に載せてピ−ク温度が600℃で焼成した。図4に示すように、焼成した基板は焼成後に、前のゾ−ン側から冷却室27に入る。冷却室は5室準備し、それぞれに本発明に係る基板冷却装置を備えている。最初の冷却室に入る時のガラス基板温度は400℃前後であった。前のゾ−ンから搬入されたセッタ−Sはセンサ−29の位置から減速させ、揺動はセンサ−28と30の間で行った。揺動速度は600mm/分で、揺動している間、多孔板21およびスリットノズル22から、給気風量15m3/分でエアをセッタ−Sに吹き付け、セッタ−Sとその上のガラス基板Gを冷却した。図3に示すように、本発明に用いた基板冷却装置は大きさ1650mm×1150mmで、エアを吹き出すスリットノズル22が長さ1600mm、ピッチ150mmで複数本設けられ、中央部には大きさ500mm×220mmの多孔板21が1つ設けられている。揺動時間はタイマ−で設定し、100秒を経た時点で次の冷却室に払い出した。最後の冷却室を出る時のガラス基板温度は100℃前後になるように設定した。本発明の焼成炉により、ガラス基板に反りを生ぜず、表面平滑性が高く、形状が良い焼成したリブが得られた。
【0027】
リブ焼成後、冷却された基板は後工程として、PDP用として使用される通常の紫外線励起型の蛍光体をスクリ−ン印刷し、蛍光体を焼成して、それぞれのリブ間に赤色、緑色、青色の蛍光体層を形成し、PDP背面板を得た。
【発明の効果】
以上説明したように、本発明に係る基板冷却装置によれば、基板が破損しにくいような温度分布になるように中央部を外周部と同じ速さもしくはより速く冷却することができ、しかもセッタ−を介して下方から間接的に冷却するので、反りを生じることもなく基板を速い速度で冷却することができる。
【0028】
そして、この基板冷却装置を冷却部に備えた焼成炉は、基板の冷却が促進されるので、冷却部での冷却速度が上がり、工程全体の時間短縮につながることから、効率の良い焼成工程を実現することができる。
【図面の簡単な説明】
【図1】従来の焼成炉の概略図である。
【図2】本発明に係る基板冷却装置の一例を示す概略断面図である。
【図3】図2においてセッタ−の下方に位置する送風機構の平面図である。
【図4】本発明の基板冷却装置を備えた焼成炉冷却室の一例を示す概略構成図である。
【図5】加熱部と冷却部を上下2組の2階建て構造とした本発明の焼成炉の一例を示す概略図である。
【符号の説明】
G ガラス基板
S セッタ−
1 焼成炉本体
2 リフタ−コンベア
3 入口コンベア
4 リフタ−コンベア
5 出口コンベア
10 ロ−ラコンベア
21 多孔板
22 スリットノズル
23 排気孔
24 ダクト
25 給気用中継スペ−ス
26 排気用中継スペ−ス
27 冷却室
28 在荷センサ−1
29 在荷センサ−2
30 在荷センサ−3
31 セッタ−搬送コンベア
32 基板供給手段
33 基板受取手段
[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of a baking furnace used to bake and harden components formed on a glass substrate, and particularly used in a baking process of a glass substrate as an electronic component such as a plasma display substrate. It is about.
[0002]
[Prior art]
As a baking furnace for baking and solidifying components formed on this type of glass substrate, for example, the type shown in FIG. 1 is generally used. While the strain point of the high strain point glass usually used as a substrate for plasma display is 570 ° C., the firing temperature of the electrodes, dielectrics and ribs is about 500 to 600 ° C. Baking is performed with the glass substrate G placed on a high setter S. For firing the plasma display substrate, a crystallized glass plate (for example, “Neoceram NO” manufactured by Nippon Electric Glass) is used as the setter.
[0003]
In the firing furnace shown in FIG. 1, first, a glass substrate G is placed on the setter S at the upper position of the lifter conveyor 2 outside the firing furnace body 1. And the glass substrate G is introduced into the upper passage in the baking furnace body 1 by the entrance conveyor 3 together with the setter S, and is conveyed as it is on the roller conveyor together with the setter S from the room temperature to about 500 to 600 ° C. And then cooled to about 400 ° C. in a slow cooling part. Next, when the glass substrate G is conveyed to the end of the upper passage, the glass substrate G is lowered to the lower passage by the lifter conveyor 4 together with the setter S, and is conveyed to the room temperature in the cooling section while being conveyed in the reverse direction by the roller conveyor. Returned. When the setter S on which the glass substrate G is placed reaches the outlet, it is transferred to the lifter conveyor 2 by the outlet conveyor 5, and the glass substrate G that has been fired is removed there. The empty setter S is moved to the upper position by the lifter conveyor 2, where the next glass substrate G is placed and the firing process is repeated. In this type of firing furnace, heaters are continuously installed on the ceiling and floor of the upper passage, and the firing temperature is controlled by these heaters as described above.
[0004]
[Problems to be solved by the invention]
In the above-mentioned types of firing furnaces, the continuous transport method that transports at a constant speed is the mainstream, but there are also devices that adopt tact transport throughout the whole process or partly for reasons such as increasing dimensional accuracy. is there. In any of the firing furnaces, the size of the apparatus is increased due to the demand for an increase in the size of the substrate and tact-up, and therefore a reduction in the firing process time is required. However, the temperature rising and soaking part maintains the characteristics and quality of the formed film surface, and the slow cooling part stabilizes the dimensions of the substrate and prevents distortion. . Therefore, shortening of the cooling process after slow cooling is necessary for shortening tact and miniaturizing the apparatus. However, when a high-temperature substrate is cooled, the outer peripheral portion cools faster than the central portion, so that a temperature gradient occurs in which the central portion is hot and the outer peripheral portion is cold. Under such a temperature gradient, the substrate is easily cracked by the force of expansion at the center of the base and the force of contraction of the outer periphery, and it is difficult to increase the cooling rate.
[0005]
The present invention has been made in view of the above circumstances, and an object is to provide a kiln example Bei a substrate cooling device which can increase the cooling rate of the substrate.
[0007]
[Means for Solving the Problems]
The firing furnace of the present invention is a firing furnace for firing a glass substrate while being transported in a state where the glass substrate is placed on a heat-resistant setter inside a firing furnace body provided with a heating unit and a cooling unit thereafter. a is, the cooling unit is made of the cooling chamber, the heat resistance of the setter - a substrate that is heat treated above, setter of heat-resistant - while surmounted, the substrate cooling device for cooling by the cooling chamber It has, as the substrate cooling device is configured to install a porous plate for blowing upward air to the chamber bottom center of the cooling chamber, is at other than the perforated plate which is arranged a plurality of slit nozzle blowing upward air a is, the cooling chamber of the transfer mechanism, the heat resistance is placed a glass substrate setter - operation for carrying the from the cooling outdoor it is before the zone on a substrate cooling device in the vicinity of the center portion of the substrate cooling device Swinging for a certain period of time With repeated operations for unloading after orbit end to the cooling outdoor a next zone, only when performing swinging, the perforated plate and from said plurality of slit nozzle setter - the lower surface by blowing air of a glass It characterized that you cool the substrate.
[0010]
The firing furnace of the present invention is characterized in that a plurality of the cooling chambers are continuously provided in the setter-conveying direction, and the swinging operation is controlled for each cooling chamber .
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0013]
Figure 2 is a schematic sectional view showing an example of a substrate cooling device according to the present invention, the substrate cooling device is used in the cooling section in the firing furnace of the type shown in Figure 1.
[0014]
As described with reference to FIG. 1, the glass substrate that has passed through the heating unit and the slow cooling unit while being placed on the setter is returned to room temperature by the cooling unit, but FIG. The setter S is conveyed by the roller conveyor 10 and stopped in one section (corresponding to a cooling chamber) of the cooling unit. FIG. 3 is a plan view of a blower mechanism located below the setter-S. FIG. 4 is a schematic configuration diagram illustrating an example of a firing furnace cooling chamber 27 provided with a substrate cooling device. FIG. 5 is a schematic view showing an example of a firing furnace according to the present invention having a two-story structure in which two sets of heating and cooling units are arranged vertically.
[0015]
As shown in FIGS. 2 and 3, below the setter S stopped on the roller conveyor 10, a porous plate 21 that blows air upward toward the setter S is installed. A plurality of slit nozzles 22 for blowing air upward are arranged side by side. A plurality of exhaust holes 23 are provided at predetermined intervals between the slit nozzles 22.
[0016]
A duct 24 is connected to the lower side of the perforated plate 21, and air is supplied from the blower through the duct 24. The plurality of slit nozzles 22 are connected to one air supply relay space 25 at the lower side, and the air supply relay space 25 is connected to a duct on the side, and air is blown from the blower through the duct. It comes to be supplied. The exhaust hole 23 is connected to an exhaust relay space 26 on the lower side of the space 25, and is exhausted from there through a duct. By adjusting the damper and blower frequencies of each duct, the temperature of the air, etc., the air volume and the wind speed can be adjusted for the perforated plate 21 and the slit nozzle 22, respectively.
[0017]
When the substrate G is cooled, air is blown out from the perforated plate 21 and the slit nozzle 22 toward the lower side of the setter S. At this time, the air volume and the air speed of the perforated plate 21 and the slit nozzle 22 are adjusted so that the central part of the substrate G is cooled at the same speed or faster than the outer peripheral part, and the exhaust corresponding to the amount of air supplied is adjusted. Is performed through the exhaust hole 23.
[0018]
By cooling the substrate in this manner, the substrate after slow cooling can be cooled to about room temperature in a few minutes. Also, when air is blown from the top and bottom, the air directly hits the top surface of the substrate, and the cooling rate is different between the front and back sides, causing the substrate to warp. Since the cooling is indirectly performed, the substrate G is not warped.
[0019]
Although the firing furnace of the present invention includes the substrate cooling device as described above, a plurality of the substrate cooling devices as described above may be provided continuously depending on the tact and the target cooling temperature.
[0020]
And in order to cool from the center part of a board | substrate, it is desirable to carry out cooling at the timing when a board | substrate is conveyed by the tact conveyance, and the board | substrate was conveyed to the approximate center part of each cooling device. In order to prevent a temperature difference from occurring between a portion where the slit nozzle 22 is present and a portion where the slit nozzle 22 is not present, a predetermined amount of rocking motion may be performed in the front-rear direction with respect to the substrate G by the roller conveyor 10.
[0021]
That is, the setter in the substrate placement state sent from the previous zone temporarily stops when it comes almost directly above the substrate cooling device, or immediately starts to swing on the substrate cooling device. The swinging motion is performed in the setter-conveying direction for a predetermined amount for a predetermined time. Only during the swinging operation, air is applied from the substrate cooling device to the lower surface of the setter on which the substrate is placed to cool the substrate so that the temperature at the center of the substrate is lowered. At the same time as the swinging is completed, the air is stopped and the setter is discharged to the next zone. If the next setter is immediately behind, the next setter is pulled in at the same time as paying out, and swinging, cooling, and paying out are repeated.
[0022]
In the transport mechanism of the cooling chamber 27 shown in FIG. 4, the setter transported from the previous zone starts decelerating at a certain timing and starts swinging at a certain position as a turning point. The decelerating timing is defined by the occupancy sensor -29, and the turning points before and after determining the swing position are defined by the occupancy sensors -28 and 30. While swinging, air is blown onto the setter S from the perforated plate 21 and the slit nozzle 22 to cool the setter S and the glass substrate G thereon. The swing time is defined by a timer, and when the swing time reaches the timer set value, the setter is transported to the next zone. Preferably, a plurality of cooling chambers are provided continuously, and a substrate cooling device and a stock sensor are installed in each cooling chamber, and control is performed for each cooling chamber.
[0023]
As shown in FIG. 5, the firing furnace of the present invention having a heating unit and a cooling unit thereafter has a heating unit and a cooling unit as one set of continuous units. It is preferable to have a two-story structure with two sets of upper and lower sides provided with a cooling unit, and space can be saved, which can contribute to cost reduction.
[0024]
Having described in detail the embodiments of the present invention, a kiln using a substrate cooling equipment according to the present invention is not intended to be limited to the above embodiments, without departing from the spirit of the present invention range Of course, various changes can be made.
[0025]
【Example】
An electrode is formed on a substrate having a glass size of 1460 mm × 1100 mm and a thickness of 3 mm, a dielectric layer is formed thereon, a rib forming material is applied to the entire surface, and the applied rib forming material is dried. A dry film having a thickness of 180 μm was obtained. Next, a dry film resist (“NCP225” manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) is laminated on the dried film, and exposed to ultraviolet rays using a photomask having a line pattern with a line width of 80 μm and a pitch of 220 μm. After exposure, development was performed to form a resist pattern having a line width of 80 μm and a pitch of 220 μm. Subsequently, sandblasting was performed using brown molten alumina # 1000 as an abrasive material to remove unnecessary portions exposed from the resist pattern, and then the resist pattern was peeled off.
[0026]
Next, using the firing furnace having a two-story structure in which the heating part and the cooling part of the present invention are two sets up and down, the substrate on which the rib pattern is formed is placed on a setter and then peeled off. The baking temperature was 600 ° C. As shown in FIG. 4, the fired substrate enters the cooling chamber 27 from the previous zone side after firing. Cooling chamber prepares 5 rooms, and a substrate cooling device according to the present invention, respectively. The glass substrate temperature when entering the first cooling chamber was around 400 ° C. The setter S carried in from the previous zone was decelerated from the position of the sensor 29, and the oscillation was performed between the sensors 28 and 30. The rocking speed is 600 mm / min. While rocking, air is blown from the perforated plate 21 and the slit nozzle 22 to the setter S with an air supply rate of 15 m <3> / min. Cooled. As shown in FIG. 3, the substrate cooling apparatus used in the present invention has a size of 1650 mm × 1150 mm, a plurality of slit nozzles 22 for blowing air are provided with a length of 1600 mm and a pitch of 150 mm, and a size of 500 mm × One perforated plate 21 of 220 mm is provided. The swing time was set by a timer, and when 100 seconds passed, it was paid out to the next cooling chamber. The glass substrate temperature when leaving the last cooling chamber was set to be around 100 ° C. By the firing furnace of the present invention, a fired rib having a good shape and a high surface smoothness without warping the glass substrate was obtained.
[0027]
After firing the ribs, the cooled substrate is screen-printed with a normal UV-excited phosphor used for PDP as a post process, the phosphor is fired, and red, green, A blue phosphor layer was formed to obtain a PDP back plate.
【The invention's effect】
As described above, according to the substrate cooling apparatus of the present invention , the central portion can be cooled at the same speed as or faster than the outer peripheral portion so that the temperature distribution is such that the substrate is not easily damaged. Since the substrate is indirectly cooled from below through −, the substrate can be cooled at a high speed without causing warpage.
[0028]
And the baking furnace equipped with this substrate cooling device in the cooling part promotes the cooling of the substrate, so that the cooling rate in the cooling part is increased and the overall process time is shortened. Can be realized.
[Brief description of the drawings]
FIG. 1 is a schematic view of a conventional firing furnace.
It is a schematic sectional view showing an example of a substrate cooling device according to the invention; FIG.
FIG. 3 is a plan view of a blower mechanism located below the setter in FIG. 2;
FIG. 4 is a schematic configuration diagram showing an example of a firing furnace cooling chamber provided with a substrate cooling device of the present invention.
FIG. 5 is a schematic view showing an example of a firing furnace according to the present invention in which a heating unit and a cooling unit have two sets of upper and lower two-story structures.
[Explanation of symbols]
G Glass substrate S Setter
DESCRIPTION OF SYMBOLS 1 Firing furnace main body 2 Lifter conveyor 3 Entrance conveyor 4 Lifter conveyor 5 Exit conveyor 10 Roller conveyor 21 Porous plate 22 Slit nozzle 23 Exhaust hole 24 Duct 25 Supply relay space 26 Exhaust relay space 27 Cooling Chamber 28 Stock sensor-1
29 Stock sensor-2
30 Stock sensor-3
31 Setter-transport conveyor 32 Substrate supply means 33 Substrate receiving means

Claims (2)

加熱部とその後に冷却部を備えた焼成炉本体の中を、耐熱性のセッタ−にガラス基板を載置した状態で搬送しながらそのガラス基板の焼成を行う焼成炉であって、
前記冷却部は、冷却室からなり、耐熱性のセッタ−上で加熱処理された基板を、該耐熱性のセッタ−上に載せたまま、該冷却室内で冷却する基板冷却装置を有し、
該基板冷却装置は、冷却室の下部中央に上向きにエアを吹き出す多孔板を設置するとともに、その多孔板以外のところには上向きにエアを吹き出す複数のスリットノズルを並べて配置したものであって、
該冷却室内の搬送機構が、ガラス基板を載置した耐熱性のセッタ−を前のゾーンである該冷却室外から基板冷却装置上に搬入する動作、基板冷却装置の中央部付近にて一定時間揺動させる動作、揺動終了後に次のゾーンである該冷却室外へ搬出する動作を繰り返し行うと共に、
揺動を行っている時のみ、前記多孔板および前記複数のスリットノズルからセッタ−の下面にエアを吹き付けてガラス基板を冷却することを特徴とする焼成炉。
A firing furnace for firing the glass substrate while transporting it in a state where the glass substrate is placed on a heat-resistant setter in the firing furnace body provided with a heating part and a cooling part thereafter,
The cooling unit includes a cooling chamber , and includes a substrate cooling device that cools the substrate heat-treated on the heat-resistant setter while the substrate is placed on the heat-resistant setter .
The substrate cooling device is configured to install a porous plate for blowing upward air to the chamber bottom center of the cooling chamber, it is at other than the perforated plate be those arranged side by side a plurality of slit nozzle blowing upward air ,
The transport mechanism in the cooling chamber moves the heat-resistant setter on which the glass substrate is placed from the outside of the cooling chamber, which is the previous zone, onto the substrate cooling device, and swings for a certain time near the center of the substrate cooling device. The operation to move, the operation to carry out to the outside of the cooling chamber which is the next zone after the end of the rocking is repeated,
Only when performing swinging, the perforated plate and setter from the plurality of slit nozzle - firing furnace, characterized that you cool the glass substrate lower surface blowing air.
前記冷却室をセッタ−搬送方向に連続して複数備えており、各々の冷却室毎に揺動動作を制御することを特徴とする請求項1に記載の焼成炉。The firing furnace according to claim 1, wherein a plurality of the cooling chambers are continuously provided in the setter-conveying direction, and the swinging operation is controlled for each cooling chamber .
JP2002030490A 2001-06-15 2002-02-07 Firing furnace Expired - Fee Related JP4170632B2 (en)

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