200902164 九、發明說明：200902164 IX. Invention Description:
【明所屬J 技術領域 本發明係有關於一種用以藉由塗料在液晶顯示器、 5 PDP(電漿顯示器）等被塗布構件之表面形成塗膜之塗膜裝 置及該塗膜裝置之氣泡檢測方法。 L先前技術3 背景技術 藉由剛模塗布機等塗膜裝置於被塗布構件之表面塗布 10塗料以形成塗膜時，一但塗料中有氣泡混入，即會因塗布 條件變動而對塗膜產生影響，成為不良品產生之原因。以 往，眾所周知的是塗料中之氣泡檢測方法，除了藉由目視 確認之外，尚有利用雷射光光學地檢測塗料中氣泡之方去 (專利文獻1)。 15 但是，一般而言，塗料具有高黏度，故難 买车以蜡由目视 或光學技術高精度地檢測微小之氣泡。[Technical Field] The present invention relates to a coating film apparatus for forming a coating film on a surface of a member to be coated such as a liquid crystal display or a 5 PDP (plasma display) by a coating material, and a bubble detecting method of the coating film apparatus . L. Prior Art 3 Background Art When a coating material is applied to a surface of a member to be coated by a coating device such as a die coater to form a coating film, air bubbles are mixed in the coating material, that is, coating film is generated due to variations in coating conditions. The impact is the cause of the defective product. In the past, it has been known that the bubble detecting method in the paint is optically detected by the laser light in addition to the visual inspection (Patent Document 1). 15 However, in general, paints have high viscosity, so it is difficult to buy a car with wax to detect tiny bubbles with high precision by visual or optical techniques.
【專利文獻1】特開2005-144376號公報 【發明内容:J 發明揭示 20 發明所欲解決之課題 本發明之課題係以高精度檢測塗料中之氣泡。 解決課題之手段 本發明之第1態樣係提供一種塗膜裝置，該塗犋裝置勺 含有：塗料槽，儲存塗料；塗料泵，壓力傳送該塗料槽= 5 200902164 之前述塗料；塗料嘴，朝被塗布構件吐出自該塗料泵壓力 傳送之前述塗料；及配管，連接前述塗料槽、前述塗料泵、 及前述塗料嘴；其特徵在於更包含有：壓力傳感器，偵測 前述配管内之前述塗料之壓力；及控制裝置，控制前述塗 5 料泵之動作，同時依據前述壓力傳感器所偵測之壓力檢測 前述塗液中之氣泡。 具體而言，前述控制裝置預先記憶參照時間，並比較 前述參照時間與實際測量時間，且若前述實際測量時間超 過前述參照時間，即判斷前述塗液中有氣體存在，又，前 10 述參照時間係自無氣泡存在時對前述塗料泵輸出指示吐出 動作開始之吐出開始信號開始，至前述配管内之前述塗料 之壓力達到預先設定之基準壓力值的時間，而該實際測量 時間係自輸出前述吐出開始信號開始，至藉由前述壓力傳 感器所偵測之壓力達到前述基準壓力值之時間。 15 因藉由比較實際測量時間與參照時間以檢測氣泡，且 該實際測量時間係使用藉由壓力傳感器所偵測之壓力而得 到者，故與目視或光學技術相比較，可以高精度檢測微量 之氣泡。 更具體而言，前述基準壓力值係當無氣泡存在時，在 20 對前述塗料泵輸出前述吐出開始信號後，前述配管内之前 述塗料之壓力達到一定壓力前之上升中壓力值。 藉由將上升中之壓力設定為基準壓力值，可確實地檢 測靜止氣泡與流動氣泡兩者。 作為替代方案之前述控制裝置預先記憶參照壓力值， 6 200902164 並比較前述參照壓力值與實際測量壓力值，且若前述實際 測量壓力值低於前述參照壓力值，即判斷前述塗液中有氣 泡存在，又，該參照壓力值係自無氣泡存在時對前述塗料 泵輸出指示吐出動作開始之吐出開始信號開始，在經過預 5 先設定之基準時間時前述配管内之前述塗料的壓力，而該 實際測量壓力值係自輸出前述吐出開始信號開始，在經過 前述基準時間時藉由前述壓力傳感器所偵測之壓力。 因藉由比較以壓力傳感器所偵測之實際測量壓力值與 參照壓力值以檢測氣泡，故與目視或光學技術相比較，可 10 以南精度檢測氣泡。 具體而言，前述基準時間係設定成當無氣泡存在時， 在對前述塗料泵輸出前述吐出開始信號後並經過該基準時 間時，前述配管内之前述塗料之壓力達到一定壓力前之上 升中狀態。 15 藉由如此地設定基準時間，可確實地檢測靜止氣泡與 流動氣泡兩者。 藉由將前述壓力傳感器設置於比前述塗料泵更靠近前 述塗料嘴側之前述配管上，可更加確實地檢測流動氣泡。 本發明之第2態樣係提供一種氣泡檢測方法，係在包含 20 有儲存塗料之塗料槽；壓力傳送該塗料槽中之前述塗料之 塗料泵；朝被塗布構件吐出自該塗料泵壓力傳送之前述塗 料之塗料嘴；及連接前述塗料槽、前述塗料泵、及前述塗 料嘴之配管的塗膜裝置中，檢測前述配管内之前述塗料中 之氣泡的方法，且該氣泡檢測方法包含：設置檢測前述配 7 200902164 管内之前述塗料之壓力的壓力傳感器； 間’該參照時間係自無 D…… 吐Ψ叙你心 任在寻對則4塗料果輸出指示 塗==之吐出開始信號開始，至前述配管内之前述 春昭 到縣W之基準壓力值的時間：比較前述 實際測量時間，該實際測量時間係自輸出前述 =始L胡始，至藉由前述壓力傳感器所制之壓力 一U述基準壓力值之時間；及若前述實㈣量時間超過 則述參照時間，即簡前述塗液中有氣泡存在。 10 15 20 本發明之第3態樣係提供一種氣泡檢測方法係在包含 有儲存塗料之塗料槽；壓力傳送該塗料槽中之前述塗料之 塗料栗；朝被塗布構件吐出自該塗料系壓力傳送之前述塗 料之塗料嘴；及連接前述塗料槽、前述塗料果、及前述塗 料嘴之配管的塗膜裝置中，檢測前述配管内之前述塗料中 之氣泡的方法，且該氣泡檢測方法包含：設置檢測前述配 官内之前述塗料之壓力的壓力傳感器；預先記憶參照壓力 值，忒參照壓力值係自無氣泡存在時對前述塗料泵輸出指 示吐出動作開始之吐出開始信號開始，在經過預先設定之 基準時間時之前述配管内之前述塗料的壓力；比較前述參 照壓力值與實際測量壓力值，該實際測量壓力值係自輪出 前述吐出開始信號開始，在經過前述基準時間時藉由前述 壓力傳感器所偵測之壓力；及若前述實際測量壓力值低於 前述參照壓力值，即判斷前述塗液令有氣泡存在。 發明效果 依據本發明，因依藉由壓力傳感器所偵測之配管中塗 8 200902164 咸液之壓力以檢測氣泡，與目視或光學技術相比較，可以 更高精度檢^料巾之氣泡。 【實施令式】 發明之最佳實施態樣 5 (第1實施態樣） 第1圖係顯示本實施態樣之塗膜裝置之概略說明圖。該 塗膜裝置大致包含有塗料槽1、塗料泵2、塗料嘴3、三通閥 4、支撐台5、洩壓閥ό、壓力傳感器7、及控制裝置8。 塗料槽1中儲存有塗料，並透過第丨之配管11Α連接至三 通間4之口如’且塗料可使用例如塗布於玻璃基板上之PDP 用坡璃糊劑，但是’並未限定為該者，依照被塗布構件12 之種類’由以往眾所周知的各種塗料中選擇適當者即可。 塗料泵2壓力傳送塗料槽1中之塗料至塗料嘴3，且塗料 泵2包含有缸體2a 、活塞2b、及驅動機構2c，活塞2b係於缸 體2a内部邊滑動邊往返移動者，而驅動機構2c係用以驅動 該〉舌塞2b者，且該驅動機構2c可使用線性馬達或伺服馬 達。塗料泵2透過第2之配管11B連接至三通閥4之口 4b。 塗料嘴3係具有眾所周知構造的狹縫口，朝被置放於由 <尚岩製成之平臺的支撐台5上之PDP等被塗布構件12，並 藉由邊吐出自塗料泵2壓力傳送之塗料邊移動，在被塗布構 件12上形成塗膜13，且塗料嘴3藉未圖示之升降裝置與驅動 裝置升降及移動。塗料嘴3透過第3之配管11C、對應塗料嘴 3之位置而撓曲之管14、及第4之配管11D連接至三通閥4之 200902164 自配管11C之中途分歧有㈣用的第5之配管11E之一 端，且第5之配管11E之另—端係開口端開放於空氣中並 且配管11Ε上設有由常閉之開關式電磁閥等構成之誠間 配管11C之塗料嘴3側，具體而言，在配管uc中配管 nE之分歧部位與塗料嘴3之間，安裝有用以伯測配管中塗 料之壓力並具有眾所周知構造之壓力傳感器7，且藉由將壓 力傳感器7設於接近配管llc之塗料嘴3之部位，彳更確實地 檢測後述之流動氣泡。 10 控制裝置8控制包含塗料泉2 '塗料嘴3、三通間4、及 城閥6之塗膜裝置全體的動作，當自塗料槽1吸引塗料至 塗料泉2時’使口 4a、4b連通，同時相對於其他口 4a、4b截 15 斷口 4c，並藉由驅動機似使㈣加之活塞⑪往容積增 加之方向移動’則塗料槽i内之塗料將經過配管UA、三通 閥4、及配管11B被吸引至塗料系2内；*自塗料幻將塗料 壓力傳送至塗料嘴3時’使〇4b、4c連通，同時相對於其他 口 4b 4c戴斷口 4a’並藉由驅動機構2c使缸體2a内之活塞 2b往谷積減少之方向移動’如此，自塗料泵2經過配管11B、 二通閥4 '第4之配管11D、管14、及第3之配管uc壓力傳 送塗料至塗料嘴3 ’且藉由將被壓力傳送之塗料自塗料嘴3 朝被塗布構件12吐出，而塗布形成塗膜13。 接著，說明氣泡檢測之原理。 第2圖係顯示在比前述三通閥4更下游之配管11C、iid 及官14中’無氣泡存在時之壓力曲線（以塗料泵2執行壓力 20 200902164[Patent Document 1] JP-A-2005-144376 SUMMARY OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION The object of the present invention is to detect bubbles in a paint with high precision. Means for Solving the Problem A first aspect of the present invention provides a coating apparatus comprising: a coating tank for storing a coating; a coating pump, a pressure transmitting the coating tank = 5 200902164; the coating nozzle; The coated member discharges the coating material transmitted from the paint pump pressure; and the pipe connects the paint tank, the paint pump, and the paint nozzle; and further includes: a pressure sensor for detecting the paint in the pipe Pressure; and a control device that controls the action of the pump 5 and detects bubbles in the coating liquid according to the pressure detected by the pressure sensor. Specifically, the control device stores the reference time in advance, and compares the reference time with the actual measurement time, and if the actual measurement time exceeds the reference time, it is determined that there is gas in the coating liquid, and the first reference time is When the bubble is not present, the discharge start signal for instructing the start of the discharge operation is started, and the pressure of the coating material in the pipe reaches a predetermined reference pressure value, and the actual measurement time is from the output of the discharge. The start signal starts to a time when the pressure detected by the aforementioned pressure sensor reaches the aforementioned reference pressure value. 15 By detecting the bubble by comparing the actual measurement time with the reference time, and the actual measurement time is obtained by using the pressure detected by the pressure sensor, it is possible to detect the trace amount with high precision compared with the visual or optical technique. bubble. More specifically, the reference pressure value is a rising pressure value before the pressure of the coating material in the piping reaches a certain pressure after the discharge start signal is output to the paint pump after the bubble is not present. By setting the rising pressure as the reference pressure value, both the stationary bubble and the flowing bubble can be reliably detected. As an alternative, the foregoing control device pre-stores the reference pressure value, 6 200902164 and compares the aforementioned reference pressure value with the actual measured pressure value, and if the actual measured pressure value is lower than the aforementioned reference pressure value, it is determined that there is a bubble in the coating liquid. Further, the reference pressure value is a pressure at which the discharge of the coating material in the pipe is started when the discharge pump starts outputting a discharge start signal to the paint pump when the bubble is not present, and the actual pressure is obtained. The measured pressure value is the pressure detected by the pressure sensor when the reference time is passed from the output of the discharge start signal. Since the bubble is detected by comparing the actual measured pressure value detected by the pressure sensor with the reference pressure value, the bubble can be detected with a precision of 10 compared with the visual or optical technique. Specifically, the reference time is set to an ascending state before the pressure of the coating material in the pipe reaches a certain pressure when the reference pump is outputted after the discharge signal is outputted to the paint pump without the presence of a bubble. . By setting the reference time in this way, both the stationary bubble and the flowing bubble can be reliably detected. By providing the pressure sensor on the pipe closer to the coating nozzle side than the paint pump, the flow bubbles can be detected more reliably. A second aspect of the present invention provides a bubble detecting method comprising: a paint tank containing 20 paint tanks for storing paint; and a paint pump for pressure-transmitting the paint in the paint tank; and discharging the pressure from the paint pump to the coated member. a coating nozzle of the coating material; and a coating device for connecting the coating tank, the coating pump, and the piping of the coating nozzle, detecting a bubble in the coating material in the piping, and the bubble detecting method includes: setting detecting The pressure sensor with the pressure of the above-mentioned paint in the above-mentioned 7200902164 tube; the reference time is from the absence of D... Ψ Ψ 你 你 你 你 你 你 你 你 你 4 4 4 4 4 4 涂料 涂料 涂料 涂料 涂料 涂料 涂料 涂料 涂料 涂料 涂料 涂料 涂料 涂料The time of the aforementioned reference pressure value of the spring to the county W in the piping: comparing the actual measurement time, the actual measurement time is from the output of the above-mentioned initial pressure to the pressure by the pressure sensor described above. The time of the reference pressure value; and if the actual (four) amount of time exceeds the reference time, that is, there is a bubble in the coating liquid. 10 15 20 The third aspect of the present invention provides a bubble detecting method in which a coating tank containing a coating material is stored; a coating pump that pressure transmits the coating material in the coating tank; and a pressure transmitting from the coating member to the coating member a coating nozzle for the coating material; and a coating device for connecting the coating tank, the coating material, and the coating nozzle, the method for detecting bubbles in the coating material in the piping, and the bubble detecting method comprises: setting a pressure sensor that detects the pressure of the coating material in the dispensing chamber; the reference pressure value is memorized in advance, and the reference pressure value is output from the discharge pump to the start of the discharge start signal indicating the start of the discharge operation when the bubble is not present. The pressure of the coating material in the piping at the reference time; comparing the reference pressure value with the actual measured pressure value, the actual measured pressure value is from the start of the discharge start signal, and the pressure sensor is used when the reference time is passed The detected pressure; and if the actual measured pressure value is lower than the aforementioned reference Pressure value, i.e., determines the presence of air bubbles so that the coating liquid. EFFECTS OF THE INVENTION According to the present invention, bubbles are detected by the pressure of the salt sprayed in the pipe detected by the pressure sensor, and the bubble of the towel can be detected with higher precision than the visual or optical technique. [Embodiment of the Invention] BEST MODE FOR CARRYING OUT THE INVENTION 5 (First embodiment) FIG. 1 is a schematic explanatory view showing a coating device of the present embodiment. The film coating apparatus roughly includes a paint tank 1, a paint pump 2, a paint nozzle 3, a three-way valve 4, a support table 5, a pressure relief valve ό, a pressure sensor 7, and a control device 8. The coating tank 1 stores a coating material and is connected to the port of the tee 4 through the first pipe 11Α, and the coating can use, for example, a PDP paste coated on a glass substrate, but 'not limited to The type of the member to be coated 12 may be selected from various conventionally known coating materials. The paint pump 2 pressure transfers the paint in the paint tank 1 to the paint nozzle 3, and the paint pump 2 includes a cylinder 2a, a piston 2b, and a drive mechanism 2c. The piston 2b is slidably moved inside the cylinder 2a while moving back and forth. The drive mechanism 2c is for driving the tongue plug 2b, and the drive mechanism 2c can use a linear motor or a servo motor. The paint pump 2 is connected to the port 4b of the three-way valve 4 through the second pipe 11B. The paint nozzle 3 has a slit opening of a well-known structure, and is applied to a member 12 to be coated such as a PDP placed on a support table 5 of a platform made of <Shangyan, and is discharged by pressure from the paint pump 2 While the paint is moving, a coating film 13 is formed on the member to be coated 12, and the coating nozzle 3 is moved up and down by a lifting device (not shown) and a driving device. The coating nozzle 3 is connected to the third pipe 11C, the pipe 14 which is deflected corresponding to the position of the coating nozzle 3, and the fourth pipe 11D is connected to the three-way valve 4, which is connected to the three-way valve 4, and the second pipe is used in the middle of the pipe 11C. One end of the pipe 11E, and the other end of the fifth pipe 11E is open to the air, and the pipe 11 is provided with a coating nozzle 3 side of the Chenggang pipe 11C composed of a normally closed switching solenoid valve, etc. In the piping uc, between the branching portion of the pipe nE and the coating nozzle 3, a pressure sensor 7 having a well-known structure in which the pressure of the coating material in the pipe is measured is installed, and the pressure sensor 7 is provided in the vicinity of the package. At the portion of the paint nozzle 3, the flow bubbles described later are more reliably detected. 10 The control device 8 controls the operation of the entire coating device including the paint spring 2' paint nozzle 3, the three-way chamber 4, and the city valve 6, and when the paint tank 1 draws the paint to the paint spring 2, the ports 4a and 4b are connected. At the same time, the fracture 4c is cut relative to the other ports 4a, 4b, and by the drive machine (4) and the piston 11 is moved in the direction of increasing volume, the paint in the paint tank i will pass through the pipe UA, the three-way valve 4, and The pipe 11B is attracted to the paint system 2; * when the paint spray pressure is transmitted to the paint nozzle 3, 'the 〇4b, 4c are connected, while the break 4a' is worn with respect to the other ports 4b 4c and the cylinder is driven by the drive mechanism 2c The piston 2b in the body 2a moves in the direction in which the valley product is reduced. Thus, the paint pump 2 passes through the pipe 11B, the two-way valve 4', the fourth pipe 11D, the pipe 14, and the third pipe uc pressure-transmitting paint to the paint nozzle. 3' and coating is formed by coating the pressure-transferred paint from the paint nozzle 3 toward the member to be coated 12. Next, the principle of bubble detection will be explained. Fig. 2 shows the pressure curve in the presence of no bubbles in the piping 11C, iid and the official 14 downstream of the aforementioned three-way valve 4 (the pressure is applied by the paint pump 2 20 200902164)
傳送動作時之時間與藉壓力傳感器7所偵測之壓力的關 係）。該第2圖中，依壓力曲線L4、L3、L2、L1之順序自塗 料嘴3之每單位時間塗料之吐出量（以下，僅稱吐出量）越 多，而與其相對應之塗料泵2之吐出壓亦越高。又，自時刻 5 t d i s時控制裝置8對塗料泵2輸出指示吐出動作開始之吐出 開始信號，則塗料泵2開始進行吐出動作。以下，稱輸出吐 出開始信號之時刻tdis為「吐出開始時刻」。藉由該第2圖， 因吐出量使壓力曲線L1〜L4之上升態樣不同，但任一壓力曲 線L1〜L4中最後以壓力傳感器7所偵測之壓力均為一定值。 10 然後，第3圖係顯示當三通閥4與洩壓閥6間之配管11E 中之塗料有氣泡混入時的壓力曲線，且混入配管11E之氣泡 因無法與塗料一起自塗料嘴3排出，故為非流動性或靜止之 氣泡，以下稱混入配管11E中塗料之氣泡為「靜止氣泡」。 第3圖中壓力曲線L1’係顯示無靜止氣泡混入之情形，而壓 15 力曲線L2’〜L4’係顯示有靜止氣泡混入之情形，並依壓力曲 線L2’、L3’、L4’之順序靜止氣泡之混入量越多，且自塗料 嘴3之每單位時間塗料之吐出量，在全部之壓力曲線 L1，〜L4,均相同。 由第3圖可知，不論有無靜止氣泡，最後以壓力傳感器 20 7所偵測之壓力均為一定。但是，與自無靜止氣泡存在時(壓 力曲線L1’)之吐出開始時刻tdis開始，至壓力呈一定為止所 需之時間ΤΓ相較，自有靜止氣泡混入時(壓力曲線L2’〜L4’) 之吐出開始時刻tdis開始，至壓力呈一定為止所需之時間 T2’〜T4’較長。又，靜止氣泡之混入量越多，也就是說，依 11 200902164 壓力曲線L2’、L3’、L4’之順序，達到一定壓力所需之時間 越長，藉此，可知利用氣泡的壓縮性，可自動檢測靜止氣 泡。 第4圖係顯示使氣泡混入三通閥4與塗料嘴3間之配管 5 11C、配管11D、或管14中之塗料中，並連續2次藉由塗料 泵2執行吐出動作時之壓力曲線，且混入配管11C、配管 11D、或管14之氣泡因可與塗料一起自塗料嘴3排出，故為 具有流動性之氣泡，以下稱混入配管11C、11D、或管14中 塗料之氣泡為「流動氣泡」。第4圖中壓力曲線L1”係顯示無 10 流動氣泡混入之情形，而壓力曲線L2”、L3 ”係顯示有流動 氣泡混入之情形，且壓力曲線L2”係顯示第1次之吐出動 作，而壓力曲線L3”係顯示第2次之吐出動作，且自塗料嘴3 之每單位時間塗料之吐出量，在全部之壓力曲線L1”〜L3” 均相同。 15 由第4圖可知，不論有無流動氣泡，最後以壓力傳感器 7所偵測之壓力均為一定。但是，與自無流動氣泡存在時(壓 力曲線L1”)之吐出開始時刻tdis開始，至壓力呈一定為止所 需之時間T1”相較，自有流動氣泡混入時（壓力曲線L2”、 L3”）之吐出開始時刻tdis開始，至壓力呈一定為止所需之時 20 間T2”、T3”較長。又，因藉由第1次之吐出動作，一定程 度量之流動氣泡與塗料可一起自塗料嘴3排出，故與在第1 次之吐出動作時至呈一定壓力為止所需之時間T2”相比 較，第2次之吐出動作時至呈一定壓力為止所需之時間T3” 較短，藉此，與靜止氣泡之情形相同，可知利用氣泡的壓 12 200902164 縮性，:自動檢測流動氣泡。 占。* ，—最後達到之壓力的絕對值（絕對壓力值）不 " '在氣泡檢測時參照該絕對壓力值，將難以高 5精度檢測靜止氣泡與流動氣泡兩者。故，本發明利用壓力 曲線中自，開始時刻tdis開始，至達到絕對壓力值前壓力 上升中之區域進仃氣泡之檢測。以下參照第5圖，說明氣 泡檢測之方法。 第5圖中壓力曲線L s d係顯示無靜止氣泡與流動氣泡混 H)入之情形’而壓力曲線Lb則顯示有靜止氣泡與流動氣泡中 至少者此入之情形，又，第5圖巾基準壓力值㈣係預先 設定之壓力值。具體而言，基準壓力值psd係當無氣泡存在 時(壓力曲線Lsd)，對塗料泵2輸出吐出開始信號（吐出開始 時刻tdis)後，配管11B〜11E及管14内之塗料達到一定壓力前 15之上升中壓力值。使用壓力傳感器7預先實際測量自無氣泡 存在時吐出開始時刻tdis開始，至配管11 b~i 1 e及管μ内贫 料之壓力達到基準壓力值Psd的時間’並以該時間為參照時 間Tref預先記憶於控制裝置8。 在實際地以塗料泵2執行將塗料麗力傳送至塗料嘴31 20動作時，控制裝置8測量自吐出開始時刻tdis開始，至藉兩 壓力傳感器7所彳貞測之壓力達到基準壓力值Psd之時間（實 際測量時間Tme)。然後’當該實際測量時間Tme超過參，棋 時間Tref時’也就是說’與無氣泡存在時相比較，壓力上升 較慢時，即可判斷配管11B〜11E及管14中至少任一之塗料中 13 200902164 有氣泡混入。 接著，參照第6圖說明本實施態樣塗膜裝置之動作。塗 布步驟（步驟S6-1)中，首先塗料泵2吸引塗料槽1内之塗料， 接著，輸出吐出開始信號至塗料泵2(步驟S6-2)，則塗料泵2 5 開始塗料之壓力傳送動作，且在輸出吐出開始信號（吐出開 始時刻tdis)的同時，控制裝置8開始計時並藉由壓力傳感器 7開始壓力測量（步驟S6-3、S6-4)，並且計時與壓力測量持 續至壓力傳感器7之偵測壓力值Pde達到基準壓力值Psd為 止（步驟S6-5)，若偵測壓力值Pde達到基準壓力值Psd，則控 10 制裝置8停止計時與壓力測量（步驟S6-6、S6-7)，而計時停 止時之時刻與吐出開始時刻tdis的差係實際測量時間 Tme，且控制裝置8比較實際測量時間Tme與參照時間 Tref(步驟S6-8)。 步驟S6-8中若實際測量時間Tme超過參照時間Tref，即 15 判斷已偵測到氣泡（為靜止氣泡與流動氣泡中至少一者)(步 驟S6-9)，此時，因無法進行下次的塗布步驟，故執行自動 排氣動作（步驟S6-10)與塗布條件下之空吐出（步驟S6-11)。 另一方面，若步驟6-8中實際測量時間Tme為參照時間Tref 以下，即判斷無偵測到氣泡（步驟S6-12)，並進行下個塗布 20 步驟。 在步驟S6-10之自動排氣動作中，首先，於開放洩壓閥 6之狀態下，藉由塗料泵2執行壓力傳送動作，則配管11E 中之靜止氣泡將自配管11E之開口端排出，接著，將洩壓閥 6回至閉閥狀態並藉由塗料泵2執行壓力傳送動作，將配管 14 200902164 lie中之流動氣泡自塗料嘴3排出。步驟S6_u之空吐出中， 不使用被塗布構件12而藉由塗料泵2執行壓力傳送動作，且 在步驟S6-8中至實際測量時間Tme為參照時間丁时以下為 止，重複步驟S6-10與步驟S6-11。 5 “樣之塗膜裝置+，因藉由tb較實際測量時間The relationship between the time when the action is transmitted and the pressure detected by the pressure sensor 7). In the second drawing, the amount of discharge of the paint per unit time from the paint nozzle 3 in the order of the pressure curves L4, L3, L2, and L1 (hereinafter, only the discharge amount) is the same as that of the paint pump 2 corresponding thereto. The higher the discharge pressure. Further, when the control device 8 outputs a discharge start signal indicating the start of the discharge operation to the paint pump 2 from the time 5 t d i s, the paint pump 2 starts the discharge operation. Hereinafter, the time tdis at which the output start signal is output is referred to as "discharge start time". According to the second drawing, the pressure curves L1 to L4 are different in the rising state due to the discharge amount, but the pressure detected by the pressure sensor 7 in any of the pressure curves L1 to L4 is a constant value. 10, the third graph shows the pressure curve when the paint in the pipe 11E between the three-way valve 4 and the pressure relief valve 6 is mixed with air bubbles, and the air bubbles mixed in the pipe 11E cannot be discharged from the paint nozzle 3 together with the paint. Therefore, it is a non-flowing or stationary bubble, and the bubble which is mixed with the coating in the pipe 11E is hereinafter referred to as "quiet bubble". In the third figure, the pressure curve L1' shows the case where no static bubbles are mixed, and the pressure 15 force curve L2'~L4' shows the case where the static bubbles are mixed, and in the order of the pressure curves L2', L3', L4'. The larger the amount of the static bubbles mixed, the more the discharge amount of the paint per unit time from the coating nozzle 3 is the same in all the pressure curves L1, L4. As can be seen from Fig. 3, the pressure detected by the pressure sensor 207 is constant regardless of the presence or absence of a stationary bubble. However, it is the time required for the discharge start time tdis when there is no static bubble (pressure curve L1'), and the time required until the pressure is constant, when the static bubble is mixed (pressure curve L2'~L4') The discharge start time tdis starts, and the time T2' to T4' required until the pressure is constant is long. Further, the more the amount of the static bubbles is mixed, that is, the longer the time required to reach a certain pressure in the order of the pressure curves L2', L3', and L4' of 11 200902164, it is understood that the compressibility of the bubbles is utilized. Static bubbles can be detected automatically. Fig. 4 is a view showing a pressure curve when the bubble is mixed into the paint in the pipe 5 11C, the pipe 11D, or the pipe 14 between the three-way valve 4 and the paint nozzle 3, and the discharge operation is performed by the paint pump 2 twice. The air bubbles mixed in the pipe 11C, the pipe 11D, or the pipe 14 are discharged from the paint nozzle 3 together with the paint, so that they are fluid bubbles, and the bubbles of the paint mixed in the pipes 11C, 11D, or 14 are hereinafter referred to as "flow." bubble". In the fourth graph, the pressure curve L1" indicates that no flow bubbles are mixed in, and the pressure curves L2" and L3" indicate that the flow bubbles are mixed, and the pressure curve L2" indicates the first discharge operation, and The pressure curve L3" indicates the second discharge operation, and the discharge amount of the paint per unit time from the paint nozzle 3 is the same for all the pressure curves L1" to L3". 15 As can be seen from Fig. 4, whether or not there is flow At the end of the bubble, the pressure detected by the pressure sensor 7 is constant. However, the time from the discharge start time tdis when there is no flow bubble (pressure curve L1)) to the time required for the pressure to be constant is T1" phase. In contrast, when the self-flowing air bubbles are mixed (pressure curves L2" and L3"), the discharge start time tdis is started, and when the pressure is constant, T2" and T3" are longer than 20. Further, because of the first In the second discharge operation, a certain amount of the flow bubbles and the paint can be discharged from the paint nozzle 3 together, so that the second discharge is compared with the time T2" required until the pressure is applied to the first discharge operation. action The time T3" required until a certain pressure is applied is short, and as in the case of the stationary bubble, it is known that the pressure of the bubble is 12 200902164, and the flow bubble is automatically detected. *, - the pressure finally reached Absolute value (absolute pressure value) does not " Refer to the absolute pressure value during bubble detection, it is difficult to detect both the stationary bubble and the flow bubble with a high accuracy of 5. Therefore, the present invention utilizes the pressure curve from the start time tdis, The detection of the bubble in the area before the absolute pressure value rises. The method of bubble detection will be described below with reference to Fig. 5. The pressure curve L sd in Fig. 5 shows that there is no static bubble and flow bubble mixed. In the case of the pressure curve Lb, at least the static bubble and the flow bubble are displayed, and the reference pressure value of the fifth towel (4) is a preset pressure value. Specifically, the reference pressure value psd is When the bubble is present (pressure curve Lsd), the paint pump 2 outputs a discharge start signal (discharge start time tdis), and the paints in the pipes 11B to 11E and the pipe 14 reach a certain pressure. The rising pressure value of 15 is measured in advance using the pressure sensor 7 in advance from the start of the discharge start time tdis when there is no bubble, to the time when the pressure of the pipe 11 b~i 1 e and the lean material in the pipe μ reaches the reference pressure value Psd. The time is referred to as the reference time Tref in advance in the control device 8. When the paint pump 2 is actually operated to transfer the paint force to the paint nozzle 31 20, the control device 8 measures the start from the discharge start time tdis to the two pressures. The time when the pressure measured by the sensor 7 reaches the reference pressure value Psd (actual measurement time Tme). Then 'when the actual measurement time Tme exceeds the reference, the chess time Tref 'that is, 'is compared with the case where no bubble exists, When the pressure rises slowly, it can be judged that there is a bubble in the coating of at least one of the pipes 11B to 11E and the pipe 14 200902164. Next, the operation of the coating apparatus of this embodiment will be described with reference to Fig. 6. In the coating step (step S6-1), first, the paint pump 2 sucks the paint in the paint tank 1, and then outputs a discharge start signal to the paint pump 2 (step S6-2), and the paint pump 2 5 starts the pressure transfer operation of the paint. While outputting the discharge start signal (discharge start time tdis), the control device 8 starts counting and starts pressure measurement by the pressure sensor 7 (steps S6-3, S6-4), and the timing and pressure measurement continues to the pressure sensor. When the detected pressure value Pde reaches the reference pressure value Psd (step S6-5), if the detected pressure value Pde reaches the reference pressure value Psd, the control device 8 stops the timing and pressure measurement (steps S6-6, S6). -7), the difference between the time when the timing is stopped and the discharge start time tdis is the actual measurement time Tme, and the control device 8 compares the actual measurement time Tme with the reference time Tref (step S6-8). In step S6-8, if the actual measurement time Tme exceeds the reference time Tref, that is, 15 determines that a bubble has been detected (at least one of the stationary bubble and the flowing bubble) (step S6-9), at this time, since the next time cannot be performed Since the coating step is performed, the automatic venting operation (step S6-10) and the empty discharge under the coating conditions are performed (step S6-11). On the other hand, if the actual measurement time Tme in step 6-8 is equal to or less than the reference time Tref, it is judged that no bubble is detected (step S6-12), and the next coating step 20 is performed. In the automatic venting operation of the step S6-10, first, when the pressure pumping operation is performed by the paint pump 2 in the state where the pressure relief valve 6 is opened, the static air bubbles in the pipe 11E are discharged from the open end of the pipe 11E. Next, the pressure relief valve 6 is returned to the closed state and the pressure transfer operation is performed by the paint pump 2, and the flow bubbles in the pipe 14 200902164 lie are discharged from the paint nozzle 3. In the empty discharge of step S6_u, the pressure transfer operation is performed by the paint pump 2 without using the coated member 12, and the step S6-10 is repeated until the actual measurement time Tme is below the reference time in step S6-8. Step S6-11. 5 “Sample coating device +, because the actual measurement time by tb
Tme與參照時間Tref以檢測氣泡，且該實際測量時間丁咖係 使用藉由壓力傳感器所積測之壓力而得到者，故與目視或 光學技術相比較，可以高精度檢測微量之氣泡。又，因參 照時間Tref係藉由無氣泡存在時壓力曲線之壓力上升中的 10值之基準壓力值設定，故可確實地檢測靜止氣泡與流動氣 泡兩者。 (第2實施態樣） 本發明第2實施態樣之塗膜裝置，其藉由控制裝置8執 行之氣泡檢測方法與第1實施態樣不同。 15 參照第7圖說明本實施態樣之氣泡檢測方法。第7圖 中，壓力曲線Lsd係顯示均無靜止氣泡與流動氣泡混入之情 形，而壓力曲線Lb則顯示有靜止氣泡與流動氣泡中至少一 者混入之情形。又，第7圖中，基準時間Tsd係預先設定之 時間。具體而言，基準時間Tsd係設定成當無氣泡存在時(壓 2〇力曲線Lsd)，在對塗料聚2輸出吐出開始信號(吐出開始時刻 tdis)後’並經過該基準時間Tsd時，配管11B〜11E及管14内 塗料之壓力達到一定壓力前之上升中狀態，且使用壓力傳 感益7預先測量自無氣泡存在時之吐出開始時刻tdis開始， 在經過基準時間Tsd時配管11B〜11E及管14内塗料之壓力， 15 200902164 並以該壓力為參照壓力值Pref預先記憶於控制裝置8。 在以塗料泵2執行將塗料壓力傳送至塗料嘴3之動作 時，控制裝置8實際測量自吐出開始時刻tdis開始，在經過 基準時間Tsd時之壓力，且當該所測量之壓力（實際測量壓 5 力值Pme)低於參照壓力值Pref時，也就是說，與無氣泡存 在時相比較，壓力上升較慢時，即可判斷配管11B〜11E及管 14中至少任一之塗料中有氣泡混入。 接著，參照第8圖說明本實施態樣塗膜裝置之動作。塗 布步驟（步驟S8-1)中，首先塗料泵2吸引塗料槽1内之塗料， 10 接著，輸出吐出開始信號至塗料泵2(步驟S8-2)，則塗料泵2 開始塗料之壓力傳送動作，且在輸出吐出開始信號(吐出開 始時刻tdis)的同時，控制裝置8開始計時（步驟S8-3)，若自 吐出開始時刻tdis開始之經過時間Te達到基準時間Tsd(步 驟S8-4)，則控制裝置8藉由壓力傳感器7進行壓力測量（步驟 15 S8-5)，且該步驟S8-5中所測量之壓力係實際測量壓力值Tme and the reference time Tref are used to detect the bubble, and the actual measurement time is obtained by using the pressure measured by the pressure sensor, so that a small amount of bubbles can be detected with high precision as compared with the visual or optical technique. Further, since the reference time Tref is set by the reference pressure value of 10 values in the pressure rise of the pressure curve when no bubble exists, both the stationary bubble and the flowing bubble can be reliably detected. (Second Embodiment) A film coating device according to a second embodiment of the present invention is different from the first embodiment in the bubble detecting method performed by the control device 8. 15 A bubble detecting method of this embodiment will be described with reference to Fig. 7. In Fig. 7, the pressure curve Lsd shows that neither the stationary bubble nor the flowing bubble is mixed, and the pressure curve Lb shows that at least one of the stationary bubble and the flowing bubble is mixed. Further, in Fig. 7, the reference time Tsd is a predetermined time. Specifically, the reference time Tsd is set such that when there is no bubble (pressure 2 force curve Lsd), after the paint gather 2 outputs a discharge start signal (discharge start time tdis) and passes the reference time Tsd, the piping 11B to 11E and the pressure of the coating material in the tube 14 before the pressure reaches a certain pressure, and the pressure sensing benefit 7 is used to measure the discharge start time tdis when there is no bubble, and the piping 11B to 11E when the reference time Tsd elapses. The pressure of the paint in the tube 14 is 15 200902164 and is pre-stored in the control device 8 with the pressure as the reference pressure value Pref. When the action of conveying the paint pressure to the paint nozzle 3 is performed by the paint pump 2, the control device 8 actually measures the pressure from the start of the discharge start time tdis, the pressure at the time of the reference time Tsd, and when the measured pressure (the actual measured pressure) When the force value Pme) is lower than the reference pressure value Pref, that is, when the pressure rises slowly as compared with the case where no bubble exists, it is determined that there is a bubble in the paint of at least one of the pipes 11B to 11E and the tube 14. Mix in. Next, the operation of the coating apparatus of this embodiment will be described with reference to Fig. 8. In the coating step (step S8-1), first, the paint pump 2 sucks the paint in the paint tank 1, and then, the discharge start signal is output to the paint pump 2 (step S8-2), and the paint pump 2 starts the pressure transfer operation of the paint. At the same time as the output of the discharge start signal (discharge start time tdis), the control device 8 starts counting (step S8-3), and the elapsed time Te from the start of the discharge start time tdis reaches the reference time Tsd (step S8-4). Then, the control device 8 performs pressure measurement by the pressure sensor 7 (step 15 S8-5), and the pressure measured in the step S8-5 is the actual measured pressure value.
Pme。又，控制裝置8停止計時（步驟S8-6)，接著，控制裝 置8比較實際測量壓力值Pme與參照壓力值Pref(步驟S 8 -7)。 步驟S8-7中若實際測量壓力值Pme低於參照壓力值 Pref，即判斷已彳貞測到氣泡（為靜止氣泡與流動氣泡中至少 20 一者）(步驟S8-8)，此時，因無法進行下次的塗布步驟，故 執行自動排氣動作（步驟S8-9)與塗布條件下之空吐出（步驟 S8-10)。另一方面，若步驟8-7中實際測量壓力值Pme為參 照壓力值Pref以上，即判斷無偵測到氣泡（步驟S8-11)，並 進行下個塗布步驟。 16 200902164 本實施態樣之塗膜裝置中，因藉由比較以壓力傳感器7 偵測之實際測量壓力值Pme與參照壓力值Pref以檢測氣 泡’故與目視或光學技術相比較，可以高精度檢測微量之 氣泡。又，因參照壓力值Pref係無氣泡存在時壓力曲線之壓 5力上升中的值’故可確實地檢測靜止氣泡與流動氣泡兩者。 第2實施態樣之其他構造及作用均與第1實施態樣相 同。 【阖式簡單說明】 第1圖係顯示本發明塗膜裝置之模式圖。 10 第2圖係顯示塗料中無氣泡混入時壓力與時間之關孫 的換式表。 第3圖係顯示塗料中有靜止氣泡混入時壓力與時間之 關係的模式表。 第4圖係顯示塗料中有流動氣泡混入時壓力與時間之 15關係的模式表。 第5圖係顯示用以說明第丨實施態樣中氣泡檢測之方法 的模式表。 第6圖係顯示用以說明第1實施態樣中塗膜裝置之動作 的流程圖。 2〇 第7圖係顯示用以說明第2實施態樣中氣泡檢測之方法 的模式表。 第8圖係顯示用以說明第2實施態樣中塗膜裝置之動作 的流程圖。 【主要元件符號說明】 17 200902164 1…塗料槽 2…塗料泵 2a".缸體 2b…活塞 2c…驅動機構 3…塗料嘴 4 Ξ·通閥 4^413,4(:. · 口 5…支撐台 6.. .洩壓閥 7.. .壓力傳感器 8.. .控制裝置 11人1犯，11(：，110，1出...配管 12…被塗布構件 13…塗膜 14."管 L1,L2,L3,L4...壓力曲線 L1’，L2’,L3’，L4’···壓力曲線 L1’’,L2’’,L3”…壓力曲線 T1’,T2’,T3’,T4'..時間 ΤΓ,Τ2’’,Τ3’’·..時間 Lsd...壓力曲線 Lb...壓力曲線 tdis...吐出開始時刻 Psd...基準壓力值 Pde...偵測壓力值 Pref…參照壓力值 Pme…實際測量壓力值 Tsd...基準時間 Tref...參照時間 Tme...實際測量時間 Te...經過時間 S6-1 〜S6-12,S8-1 〜S8-11 …步驟 18Pme. Further, the control device 8 stops counting (step S8-6), and then, the control device 8 compares the actual measured pressure value Pme with the reference pressure value Pref (step S8-7). In step S8-7, if the actual measured pressure value Pme is lower than the reference pressure value Pref, it is judged that the bubble has been detected (at least 20 of the stationary bubble and the flowing bubble) (step S8-8), at this time, Since the next coating step cannot be performed, the automatic venting operation (step S8-9) and the empty discharge under the coating conditions are performed (step S8-10). On the other hand, if the actually measured pressure value Pme in step 8-7 is equal to or higher than the reference pressure value Pref, it is judged that no bubble is detected (step S8-11), and the next coating step is performed. 16 200902164 In the coating device of the present embodiment, by comparing the actual measured pressure value Pme detected by the pressure sensor 7 with the reference pressure value Pref to detect the bubble, it can be detected with high precision by comparing with the visual or optical technique. A small amount of bubbles. Further, since the reference pressure value Pref is a value at which the pressure of the pressure curve is increased when there is no bubble, it is possible to reliably detect both the stationary bubble and the flow bubble. The other structures and operations of the second embodiment are the same as those of the first embodiment. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a coating film apparatus of the present invention. 10 Fig. 2 shows the change table of the pressure and time when there is no air bubble in the paint. Figure 3 is a model table showing the relationship between pressure and time when there is a static bubble in the paint. Fig. 4 is a mode table showing the relationship between pressure and time when there is a flow of air bubbles in the paint. Fig. 5 is a mode table showing a method for explaining bubble detection in the second embodiment. Fig. 6 is a flow chart for explaining the operation of the coating device in the first embodiment. 2A Fig. 7 is a mode table showing a method for explaining bubble detection in the second embodiment. Fig. 8 is a flow chart for explaining the operation of the coating device in the second embodiment. [Main component symbol description] 17 200902164 1... paint tank 2... paint pump 2a". cylinder 2b... piston 2c... drive mechanism 3... paint nozzle 4 Ξ· vent valve 4^413, 4 (:. · port 5... support Table 6. Pressure Relief Valve 7. Pressure Sensor 8. Control Device 11 Person 1 Crime, 11 (:, 110, 1 Out... Pipe 12... Coated Member 13... Coating Film 14." Tube L1, L2, L3, L4... Pressure curve L1', L2', L3', L4'···pressure curve L1'', L2'', L3"...pressure curve T1', T2', T3' ,T4'..timeΤΓ,Τ2'',Τ3''·..time Lsd...pressure curve Lb...pressure curve tdis...spit start time Psd...reference pressure value Pde...detect The measured pressure value Pref...refers to the pressure value Pme...the actual measured pressure value Tsd...the reference time Tref...the reference time Tme...the actual measured time Te...the elapsed time S6-1 to S6-12, S8-1 ~S8-11 ...Step 18