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Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


screen printer from MPM

Andrea

#27166

screen printer from MPM | 6 February, 2004

We consider two screen printer from MPM and it is type SPM and MicroFlex. How you compare these two machines. Our the smallest fine pitch is 0.5 mm QFP. Is it really worth to buy SPM or MicroFlex will handle with it without any problems.? And what kind of option you suggest to add to the machine cleaning but dry or wet? what is difference? what else?

thank for help in advance

Andrea

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#27167

screen printer from MPM | 6 February, 2004

SPM is superior in terms of technology and application. SPM has larger print area, up to 20� x 19", vs. 17.7� x 15.7� for the MicroFlex. MicroFlex is microprocessor controlled while the SPM has a PC. SPM can print down to 12mil (0.3mm) fine pitch no sweat, MicroFlex is spec'd at 20mil (0.5mm) but should do 16mil(0.4mm)with a good stencil and board design. Alignment repeatability: +/-0.004" at 6 Sigma for the MicroFlex and +/-0.0005" at 6 Sigma for the SPM. Also, SPM has a greater snap-off range adjustment as well, 0 - 0.3" vs. 0 - 0.1" for the MF. The SPM and MicroFlex use the same camera holders/positioning mechanism. The MicroFlex may be a better fit if large board size and ultra-fine pitch will not be your application. There is a rather significant difference in price. Wiper is a good option if you are doing a lot of fine-pitch. I believe wiper option is wet/dry. For wet, you can set it to apply a solvent to the paper to loosen paste from the stencil apertures. Then you follow with a dry wipe. You can set it for wet then dry or dry wipe only. Vision alignment is a good option too. Good luck.

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ianlg

#27206

screen printer from MPM | 11 February, 2004

You might like to look at the R29-V. Its similar to the SPM but a lot cheaper. Check it out on RPAmericas web site. http://www.rpamericas.com. They should be showing it at Apex this year on stand 1417. It also has both std and vac wet/dry usc.

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