如何降低喷锡后防焊白化的现象

1、如何降低喷锡后防焊白化 专题成员   姓名职称 学历 组长：刘益利副工程师大   学 组员：张启煌副工程师专   科 王玉琪现场组长专   科 皮贤明现场组长专   科 李志清现场组长专   科 1.前言:   随着客户对PCB的质量要求越来越严格，相对地在外观上也越来越要求完美。所以电路板厂无不在原物料、机械设备、制作条件上，想尽各种方法来改善，以满足客户需求。良好的外观质量，更能取得客户的信赖，以奠定后续定单能源源不绝。2.选题理由:   防焊油墨在喷锡后产生白

2、化现象，虽然于功能上不影响，但是在外观上出现瑕疵，使得客户产生疑虑，甚至不允收。所以利用DOE的手法找出最佳生产条件，以降低防焊油墨在喷锡后产生白化现象。 3.质量问题现况分析: 月 份-3 7月-2 8月-1 9月0 10月1 11月2 12月3 1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指开始作专题之月份) 4.制程说明:   防焊前处理印刷预烤曝光显影后烘烤喷锡前处理IR预热浸Flux喷锡浮床喷锡后清洗出料检视因本厂出现

3、防焊白化以Curtain Coating比例较高，因此选择以Curtain Coating印刷方式找出白化成因。   5.特性要因分析:   6.第一阶段实验配置及解析:   6.1实验因子及水平对照表:6.2配置方式及交互作用:   6.2.1采L16215方式配置 6.2.2点线图:6.3实验解析(1)白化 6.3.1防焊特性(1)白化实验配置及数据:   FACTORABABFIDADCACeGHAHIGFGDATAROW/COL1234567891011121314153111111111111111142111111122222222

4、031112222111122228411122222222111110512211221122112296122112222112211071222211112222110812222112211112229212121212121212110212121221212121811212212112122121712212212121211212513221122112211221614221122121122112115221211212212112016221211221121221  6.3.2防焊特性(1)白化实验平均值比较表：   COLFACTORSIAVE(L

5、1)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)白化变异数分析: ANOVA：在合并后   FACTORSiDFVF(%)J110.251110.2538.587555.3

6、571*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=194t=82.5110 6.3.4防焊特性(1)白化贡献率分析:   J (板温)E (曝光能量)C (预烤温度)K (水洗温度)ABI (后烤温度)A (下墨量)B (油墨黏度)E (误差值)贡献率55.36%11.41%6.77%3.17%1.75%1.75%0

7、.96%1.34%17.49%累积 贡献率55.36%66.77%73.54%76.71%78.46%80.21%81.17%82.51%100.00% 6.4实验解析(2)压痕 6.4.1防焊特性(2)压痕实验配置及数据: FACTORABABFIDADCACeGHAHIGFGDATAROW/COL123456789101112131415211111111111111111211111112222222203111222211112222041112222222211111.551221122112211221.561221122221122110712222111122221108122

8、2211221111228921212121212121210102121212212121213112122121121221210.5122122121212112127132211221122112218.5142211221211221121152212112122121122.5162212112211212216.4.2防焊特性(2)压痕实验平均值比较表： COLFACTORSIAVE(L1)AVE(L2)1A74.390620.755.06252B0.3906253.06252.753AB0.3906252.753.06254C66.015624.93750.8755F26.26

9、5621.6254.18756J0.3906253.06252.757H0.3906252.753.06258D0.1406252.812539I0.7656253.1252.687510G1.2656253.18752.62511K0.3906252.753.062512CD1.8906252.68753.12513JK1.8906253.252.562514HI0.7656252.68753.12515FG1.8906253.252.56256.4.3防焊特性(2)压痕变异数分析:   FACTORSiDFVF(%)A74.39062174.39062144.272741.948

10、3*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=176.1093t=95.8921 6.4.4防焊特性(2)压痕贡献率

11、分析: A (下墨量)C (预烤温度)F (曝光能量)JKFGG (静置时间)K (水洗温度)J (板温)E (误差值)贡献率41.95%37.19%14.62%0.78%0.78%0.43%0.07%0.07%4.11%累积贡献率41.95%79.14%93.76%94.54%95.32%95.75%95.82%95.89%100.00% 6.5实验解析(3)铜面氧化 6.5.1防焊特性(3)铜面氧化实验配置及数据:   FACTORABABFIDADCACeGHAHIGFGDATAROW/COL1234567891011121314153111111111111111122111

12、11112222222243111222211112222541112222222211112512211221122112256122112222112211271222211112222114812222112211112209212121212121212010212121221212121011212212112122121012212212121211212013221122112211221014221122121122112115221211212212112016221211221121221 6.5.2防焊特性(3)铜面氧化实验平均值比较表   COLFACTORS

13、IAVE(L1)AVE(L2)1A42.253.3750.1252B01.751.753AB0.251.8751.6254C11.525F0.251.6251.8756J11.527H2.251.3752.1258D11.529I2.251.3752.12510G121.511K2.252.1251.37512CD01.751.7513JK0.251.8751.62514HI121.515FG0.251.8751.625 6.5.3防焊特性(3)铜面氧化变异数分析:   FACTORSiDFVF(%)A42.25142.25147.87576.2987*I2.2512.257.875

14、3.57142*H2.2512.257.8753.57142*K2.2512.257.8753.57142*C1113.51.29870D1113.51.29870G1113.51.29870J1113.51.29870e270.2857147.78220St=55t=92.20776.5.4防焊特性(3)铜面氧化贡献率分析: A (下墨量)I (烘烤温度)H (后烤时间)K (水洗温度)C (预烤温度)D (预烤时间)G (静置时间)J (板温)E (误差项)贡献率76.30%3.57%3.57%3.57%1.30%1.30%1.30%1.30%7.79%累积贡献率76.30%79.87%8

15、3.44%87.01%89.00%89.61%90.91%92.21%100.00%      7.Cross Table 因子特性质ABCFJHDIGK结论防焊白化C2F2J11.A2、B2、C2、F2、J1、H1、I1、G1、K2为 Cross Table分析后之较佳条件，其中遇多特 性质，有冲突时以其贡献率%来取舍。 2.本次实验之二面多特性质经分析后，第二阶 段实验中取A2、B2、D1、H1、I1、G1、K2 为常数项，C、F、J三因子为继续做第二阶 段实验。 3.本次实验之二个多特性质经分析后，显著因 子无交互作用。显著性*贡献率6.77%11.41%5

16、5.36%底片压痕A1C2F1显著性*贡献率41.95%37.19%14.83%铜面氧化A2H1I1K2显著性*贡献率76.3%3.75%3.75%3.75%结 论A2C2F2J1H1I1K2  8.第二阶段实验配置及解析:   8.1计划构想: 由Cross Table结论得知C、F、J为显著因子,希望在第二阶段少因子多水平中寻找出最佳量产条件   8.2因子水平对照表:因子代号水平交互作用123预烤温度CC21C22C23曝光能量FF21F22F23喷锡后处理前板温JJ21J12J13   8.3点线图:8.4实验常数:1.下墨量 5. 后烘烤温度

17、2.油墨黏度 6. 曝光静置时间 3.预烤时间 7.喷锡后水洗温度 4.后烘烤时间 8.5第二阶段实验防焊喷锡后白化实验配置及数据:   factorJFeeCeeeeeeeedataROL/COL1234567891011121301223123131212302212312312312303111111111111104122222233311105212323123123106133333322211107321321332113208111133333333309111122222222201023122311233120113321213132321012321332113

18、2213013223112323131201412223331112220152231312123231016231231223112301721233123123120183321321213132019122211122233302013332221113330211333111333222022332113232121302331322132132130242312123312231025321313221332102631323213213210273132132132132 8.6防焊喷锡后白化实验变异数分析:   FACTORSiDFVF(%)C020J020F020e0

19、200St0t= 8.7第二阶段实验防焊曝光底片压痕实验配置及数据:   factorJFeeCeeeeeeeedataROL/COL123456789101112130122312313121230221231231231230311111111111112412222223331110521232312312311613333332221111732132133211321811113333333330911112222222221102312231123312111332121313232101232133211322132132231123231312014122233311

20、12221152231312123231016231231223112321721233123123121183321321213132119122211122233302013332221113331211333111333222122332113232121302331322132132130242312123312231025321313221332112631323213213211273132132132132 8.8防焊曝光底片压痕实验变异数分析:   FACTORSiDFVF(%)F0.66666620.3333330.666662.77777J0.66666620.3

21、333330.666662.77777C0.66666620.3333330.666662.77777e10200.5St=12t=8.33333 8.9第二阶段实验防焊下铜面氧化实验配置及数据:   factorJFeeCeeeeeeeedataROL/COL123456789101112131.1122312313121231.1221231231231231.2311111111111111.2412222223331111.1521232312312311.1613333332221111.1732132133211321.1811113333333331.291111222

22、2222221.21023122311233121.21133212131323211.11232133211322131.21322311232313121.114122233311122211522313121232311.11623123122311231.21721233123123121.21833213212131321.11912221112223331.120133322211133312113331113332221.12233211323212131.12331322132132131.12423121233122311.12532131322133211.22631323

23、213213211.2273132132132132 8.10防焊下铜面氧化变异数分析:   FACTORSiDFVF(%)F0.00962920.0048141.192661.61538J0.00518520.0025920.642203C0.00074020.0003700.091747.61538e0.080740200.00403787.7692St=0.096296t=12.2307  9.第二阶段实验结论: 操作条件对照表实验因子因子代号原始作业条件最佳作业条件下墨量AA1±20g/m2A2±20g/m2油墨黏度BB1±10secB

24、2±15sec预烤温度CC1±2.5C2±5预烤时间DD1D2曝光能量FF1±50mj/cm2F2±100mj/cm2曝光后静置时间GG1G1后烘烤时间HH1H1后烘烤温度II1±10I2±10喷锡后板温JJ1±10J2±15喷锡热水洗温度KK1±10K2±15由第二阶段实验与两个多特性质分析后,获得最佳作业条件        10.再现性结果确认   1、制 程：防焊 2、再现性实施期间：1999/12/272000/1/9 3、再现性生产记录： 生产批数：420批 生产总批数：100800 Working Panel4、再现性质量记录：1999/12/272000/1/19无白化现象发生 5、再现性普及性确认： 是