如何降低噴錫后防焊白化

如何降低噴錫后防焊白化1.前言:隨著客戶對PCB的質(zhì)量要求越來越嚴(yán)格，相對地在外觀上也越來越要求完美。所以電路板廠無不在原物料、機(jī)械設(shè)備、制作條件上，想盡各種方法來改善，以滿足客戶需求。良好的外觀質(zhì)量，更能取得客戶的信賴，以奠定后續(xù)定單能源源不絕。2.選題理由:

防焊油墨在噴錫后產(chǎn)生白化現(xiàn)象，雖然于功能上不影響，但是在外觀上出現(xiàn)瑕疵，使得客戶產(chǎn)生疑慮，甚至不允收。所以利用DOE的手法找出最佳生產(chǎn)條件，以降低防焊油墨在噴錫后產(chǎn)生白化現(xiàn)象。3.質(zhì)量問題現(xiàn)況分析:

月份-37月-28月-19月010月111月212月31月白

化

不良率0.0513

(5.13%)0.0484

(4.84%)0.0324

(3.24%)0.0312

(3.12%)0.0171

(1.71%)0.0025

(0.25%)(※0指開始作專題之月份)4.制程說明:

防焊前處理→印刷→預(yù)烤→曝光→顯影→后烘烤→噴錫前處理→IR預(yù)熱→浸Flux→噴錫→浮床→噴錫后清洗→出料檢視

※因本廠出現(xiàn)防焊白化以CurtainCoating比例較高，因此選擇以CurtainCoating印刷方式找出白化成因。

5.特性要因分析:6.第一階段實驗配置及解析:

6.1實驗因子及水平對照表:

6.2配置方式及交互作用:

6.2.1采L16215方式配置6.2.2點(diǎn)線圖:

6.3實驗解析(1)──白化6.3.1防焊特性(1)──白化實驗配置及數(shù)據(jù):

FACTORABABFIDADCACeGHAHIGFGDATAROW/COL1234567891011121314153111111111111111142111111122222222031112222111122228411122222222111110512211221122112296122112222112211071222211112222110812222112211112229212121212121212110212121221212121811212212112122121712212212121211212513221122112211221614221122121122112115221211212212112016221211221121221

6.3.2防焊特性(1)──白化實驗平均值比較表：

COLFACTORSIAVE(L1)AVE(L2)1A14.253.752B0.254.1253.8753AB6.253.3754.6254C16535F255.252.756J110.251.3756.6257H0.254.1253.8758D2.253.6254.3759I6.253.3754.62510G43.54.511K93.254.7512CD2.254.3753.62513JK6.254.6.253.37514HI44.53.515FG14.253.75

6.3.3防焊特性(1)──白化變異數(shù)分析:ANOVA：在合并后

FACTORSiDFVF@(%)J110.251110.2538.587555.3571**F251258.7511.4138*C161165.66.77466*K9193.153.16642AB6.2516.252.18751.71889I6.2516.252.18751.74889A1110.350.95729B0.2510.250.08751.34388e2072.85714217.4889St=194@t=82.51106.3.4防焊特性(1)──白化貢獻(xiàn)率分析:

J

(板溫)E

(曝光能量)C

(預(yù)烤溫度)K

(水洗溫度)ABI

(后烤溫度)A

(下墨量)B

(油墨黏度)E

(誤差值)貢獻(xiàn)率55.36%11.41%6.77%3.17%1.75%1.75%0.96%1.34%17.49%累積

貢獻(xiàn)率55.36%66.77%73.54%76.71%78.46%80.21%81.17%82.51%100.00%6.4實驗解析(2)──壓痕6.4.1防焊特性(2)──壓痕實驗配置及數(shù)據(jù):FACTORABABFIDADCACeGHAHIGFGDATAROW/COL123456789101112131415211111111111111111211111112222222203111222211112222041112222222211111.551221122112211221.5612211222211221107122221111222211081222211221111228921212121212121210102121212212121213112122121121221210.5122122121212112127132211221122112218.5142211221211221121152212112122121122.5162212112211212216.4.2防焊特性(2)──壓痕實驗平均值比較表：COLFACTORSIAVE(L1)AVE(L2)1A74.390620.755.06252B0.3906253.06252.753AB0.3906252.753.06254C66.015624.93750.8755F26.265621.6254.18756J0.3906253.06252.757H0.3906252.753.06258D0.1406252.812539I0.7656253.1252.687510G1.2656253.18752.62511K0.3906252.753.062512CD1.8906252.68753.12513JK1.8906253.252.562514HI0.7656252.68753.12515FG1.8906253.252.56256.4.3防焊特性(2)──壓痕變異數(shù)分析:

FACTORSiDFVF@(%)A74.39062174.39062144.272741.9483**C66.01562166.01562128.030337.1927**F26.26562126.2656250.9393914.6215**JK1.89062511.8906253.6666660.78076FG1.89062511.8906253.6666660.78076G1.26062511.2656252.4545450.42587K0.39062510.3906250.7575750.07097J0.39062510.3906250.7575750.07097e3.60937570.5156254.10788St=176.1093@t=95.89216.4.4防焊特性(2)──壓痕貢獻(xiàn)率分析:A(下墨量)C(預(yù)烤溫度)F(曝光能量)JKFGG(靜置時間)K(水洗溫度)J(板溫)E(誤差值)貢獻(xiàn)率41.95%37.19%14.62%0.78%0.78%0.43%0.07%0.07%4.11%累積貢獻(xiàn)率41.95%79.14%93.76%94.54%95.32%95.75%95.82%95.89%100.00%6.5實驗解析(3)──銅面氧化

6.5.1防焊特性(3)──銅面氧化實驗配置及數(shù)據(jù):

FACTORABABFIDADCACeGHAHIGFGDATAROW/COL1234567891011121314153111111111111111122111111122222222431112222111122225411122222222111125122112211221122561221122221122112712222111122221148122221122111122092121212121212120102121212212121210112122121121221210122122121212112120132211221122112210142211221211221121152212112122121120162212112211212216.5.2防焊特性(3)──銅面氧化實驗平均值比較表

COLFACTORSIAVE(L1)AVE(L2)1A42.253.3750.1252B01.751.753AB0.251.8751.6254C11.525F0.251.6251.8756J11.527H2.251.3752.1258D11.529I2.251.3752.12510G121.511K2.252.1251.37512CD01.751.7513JK0.251.8751.62514HI121.515FG0.251.8751.6256.5.3防焊特性(3)──銅面氧化變異數(shù)分析:

FACTORSiDFVF@(%)A42.25142.25147.87576.2987**I2.2512.257.8753.57142*H2.2512.257.8753.57142*K2.2512.257.8753.57142*C1113.51.29870D1113.51.29870G1113.51.29870J1113.51.29870e270.2857147.78220St=55@t=92.20776.5.4防焊特性(3)──銅面氧化貢獻(xiàn)率分析:A(下墨量)I(烘烤溫度)H(后烤時間)K(水洗溫度)C(預(yù)烤溫度)D(預(yù)烤時間)G(靜置時間)J(板溫)E(誤差項)貢獻(xiàn)率76.30%3.57%3.57%3.57%1.30%1.30%1.30%1.30%7.79%累積貢獻(xiàn)率76.30%79.87%83.44%87.01%89.00%89.61%90.91%92.21%100.00%

7.CrossTable因子特性質(zhì)ABCFJHDIGK結(jié)論防焊白化C2F2J11.A2、B2、C2、F2、J1、H1、I1、G1、K2為CrossTable分析后之較佳條件，其中遇多特性質(zhì)，有沖突時以其貢獻(xiàn)率@%來取舍。2.本次實驗之二面多特性質(zhì)經(jīng)分析后，第二階段實驗中取A2、B2、D1、H1、I1、G1、K2為常數(shù)項，C、F、J三因子為繼續(xù)做第二階段實驗。3.本次實驗之二個多特性質(zhì)經(jīng)分析后，顯著因子無交互作用。顯著性****貢獻(xiàn)率6.77%11.41%55.36%底片壓痕A1C2F1顯著性******貢獻(xiàn)率41.95%37.19%14.83%銅面氧化A2H1I1K2顯著性*****貢獻(xiàn)率76.3%3.75%3.75%3.75%結(jié)論A2C2F2J1H1I1K2

8.第二階段實驗配置及解析:

8.1計劃構(gòu)想:由CrossTable結(jié)論得知C、F、J為顯著因子,希望在第二階段少因子多水平中尋找出最佳量產(chǎn)條件

8.2因子水平對照表:因子代號水平交互作用123預(yù)烤溫度CC21C22C23曝光能量FF21F22F23噴錫后處理前板溫JJ21J12J13

8.3點(diǎn)線圖:

8.4實驗常數(shù):1.下墨量5.后烘烤溫度

2.油墨黏度6.曝光靜置時間

3.預(yù)烤時間7.噴錫后水洗溫度

4.后烘烤時間8.5第二階段實驗防焊噴錫后白化實驗配置及數(shù)據(jù):

factorJFeeCeeeeeeeedataROL/COL123456789101112130122312313121230221231231231230311111111111110412222223331110521232312312310613333332221110732132133211320811113333333330911112222222220102312231123312011332121313232101232133211322130132231123231312014122233311122201522313121232310162312312231123017212331231231201833213212131320191222111222333020133322211133302113331113332220223321132321213023313221321321302423121233122310253213132213321026313232132132102731321321321328.6防焊噴錫后白化實驗變異數(shù)分析:

FACTORSiDFVF@(%)C020J020F020e0200St0@t=8.7第二階段實驗防焊曝光底片壓痕實驗配置及數(shù)據(jù):

factorJFeeCeeeeeeeedataROL/COL12345678910111213012231231312123022123123123123031111111111111241222222333111052123231231231161333333222111173213213321132181111333333333091111222222222110231223112331211133212131323210123213321132213213223112323131201412223331112221152231312123231016231231223112321721233123123121183321321213132119122211122233302013332221113331211333111333222122332113232121302331322132132130242312123312231025321313221332112631323213213211273132132132132

8.8防焊曝光底片壓痕實驗變異數(shù)分析:

FACTORSiDFVF@(%)F0.66666620.3333330.666662.77777J0.66666620.3333330.666662.77777C0.66666620.3333330.666662.77777e10200.5St=12@t=8.33333

8.9第二階段實驗防焊下銅面氧化實驗配置及數(shù)據(jù):

factorJFeeCeeeeeeeedataROL/COL123456789101112131.1122312313121231.1221231231231231.2311111111111111.2412222223331111.1521232312312311.1613333332221111.1732132133211321.1811113333333331.2911112222222221.21023122311233121.21133212131323211.11232133211322131.21322311232313121.114122233311122211522313121232311.11623123122311231.21721233123123121.21833213212131321.11912221112223331.120133322211133312113331113332221.12233211323212131.12331322132132131.12423121233122311.12532131322133211.22631323213213211.2273132132132132

8.10防焊下銅面氧化變異數(shù)分析:

FACTORSiDFVF@(%)F0.00962920.0048141.192661.61538J0.00518520.0025920.642203C0.00074020.0003700.091747.61538e0.080740200.00403787.7692St=0.096296@t=12.2307

9.第二階段實驗結(jié)論:操作條件對照表實驗因子因子代號原始作業(yè)條件最佳作業(yè)條件下墨量AA1±20g/m2A2±20g/m2油墨黏度BB1±10secB2±15sec預(yù)烤溫度CC1±2.5℃C2±5℃預(yù)烤時間DD1D2曝光能量FF1±50mj/cm2F2±100mj/cm2曝光后靜置時間GG1G1后烘烤時間HH1H1后烘烤溫度II1±10℃I2±10℃噴錫后板溫JJ1±10℃J2±15℃噴錫熱水洗溫度KK1±10℃K2±15℃※由第二階段實驗與兩個多特性質(zhì)分析后,獲得最佳作業(yè)條件

10.再現(xiàn)性結(jié)果確認(rèn)

1、制程：防焊

2、再現(xiàn)性實施期間：1999/12/27～2000/1/9

3、再現(xiàn)性生產(chǎn)記錄：生產(chǎn)批數(shù)：420批

生產(chǎn)總批數(shù)：100800WorkingPanel4、再現(xiàn)性質(zhì)量記錄：1999/12/27～2000/