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.
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
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
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
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
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
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
Electronics Forum | Wed Jul 27 09:58:05 EDT 2011 | davef
Pressure printing systems Conventional stencil printing techniques have fundamental limitations as regards paste handling: The volume of paste available for printing is limited, so frequent replenishment is necessary Paste is difficult to c
Electronics Forum | Fri Apr 27 10:33:58 EDT 2007 | ck_the_flip
Jeremy, well said! Thanks for "validating" my theory... LOL I agree that the sampling frequency, AND methodology are key things with 3D inspection. 3D will give you some insight onto how your paste (rheology, viscosity, thixotropy)AND process are
Electronics Forum | Mon Feb 10 14:34:56 EST 2014 | jigo91
Hi, I wanted to know how can we test our paste quality, as viscosity, temperature in which it is delivered to the SMT line and other variables that can affect our paste dispense or soldering. Our concerns are that paste quality may be causing solde
