Electronics Forum: viscosity (Page 1 of 26)

viscosity measurements

Electronics Forum | Tue Jul 06 09:58:27 EDT 1999 | dangy

who can tell me how viscosity measurements are really effective in smt process control? what can I monitor? Is it depending from fine pitch size? Thanks a lot. g. d'andrea

Open v.s viscosity

Electronics Forum | Tue Apr 18 08:05:00 EDT 2000 | Wister

Hi, I got an interesting result after completing DOE that more open defects occurred higher the viscosity.The ppm would be 500 while the viscosity is 950 and it would be 1500 while the viscosity is 1050.The range of viscosity is 900 ~ 1100kcps. The p

Re: Open v.s viscosity

Electronics Forum | Wed Apr 19 22:33:49 EDT 2000 | Dave F

Wister: Those are neat results!!! What results do you get if you use different squeegee speeds with your viscosity DOE? With high viscosity and the print speed you're using the roll may be "skipping over" the apertures. Wadda loose? Dave F

ideal solder paste viscosity

Electronics Forum | Thu May 14 01:14:08 EDT 2015 | m_imtiaz

i want to know what is the ideal viscosity of solder paste before printing. i have brookfield viscosity meter with Spiral Spindle.

ideal solder paste viscosity

Electronics Forum | Thu May 14 08:22:27 EDT 2015 | m_imtiaz

in enclosed data sheet mentioned 230Pa.s with malcom viscosity meter i have brookfield viscocity meter kindly suggest

Re: viscosity measurements

Electronics Forum | Wed Jul 07 13:33:45 EDT 1999 | Dave F

who can tell me how viscosity measurements are really effective in smt process control? what can I monitor? Is it depending from fine pitch size? Thanks a lot. g. d'andrea People write books on SMT process control. What's your problem? I

Re: Open v.s viscosity

Electronics Forum | Thu Apr 20 00:53:23 EDT 2000 | Wister

Hi,Dave The "skip" wouldn't happened because we monitor the solder paste height every two hours.The open position is between chip terminal and the solder paste.one terminal lift a little not as same as tombstone.I suspect the activity of solder paste

ideal solder paste viscosity

Electronics Forum | Thu May 14 08:17:00 EDT 2015 | emeto

I am pretty sure that will vary on the paste manufacturer. Using different amount and composition of flux will give you some different viscosity. I evaluated different solder paste brands before and I can tell you that some of them are very runny com

Re: viscosity measurements

Electronics Forum | Sat Jul 10 00:57:17 EDT 1999 | Scott

who can tell me how viscosity measurements are really effective in smt process control? what can I monitor? Is it depending from fine pitch size? Thanks a lot. g. d'andrea The last place I worked used a viscosity meter, funny how little was

Re: Open v.s viscosity

Electronics Forum | Thu Apr 20 21:45:10 EDT 2000 | Dave F

Wister: Oooo, I understand now what you mean by "an open." Sorry, I was (am) a bit dense. Your hypothesis is reasonable. On the other hand, have you looked at the traditional causes of tomb stoning also? For a defect to be a "tomb stone," it doe

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