Electronics Forum | Thu May 04 11:07:23 EDT 2006 | JW
Hello, During a recent customer audit, one of their auditors asked if we measured airborne particles in our SMT operation area. Within their operations, they mentioned a concern when placing micro-BGA's. My question is: do some SMT lines use a pseudo
Electronics Forum | Fri Nov 05 03:53:29 EDT 2010 | Mark
The smallest particle sixe for type 3 paste in 25 microns. This is far to big to remain airborne.Therefore I would suggest to continue to use air to clean stencils as it does clean the apertures effectively.What solvent is used to clean the stencils?
Electronics Forum | Tue Nov 08 19:25:14 EST 2011 | isd_jwendell
I do not have a answer for you, but it sounds like electro-static charge is making air-borne particles stick to the machine. What are the air handling conditions? Could be you need a better filtration system. I use a HEPA filter system. I've always w
Electronics Forum | Fri Oct 02 16:11:46 EDT 1998 | Benji
Hi Dave, In the first level packaging, people who work on the assembly floor must not wear make-up. In the old days when the requirements were not as strict as what it is these days, one good protection was to wear finger cots or surgical gloves. H
Electronics Forum | Sun May 18 00:43:06 EDT 2008 | aisart
There are two approaches I have seen at different sites that seem to work. The first one is for them to use gloves. When I asked as to why, they told me there are studies that showed people wearing gloves are less likely to put them in their mouth an
Electronics Forum | Tue Jan 29 09:59:36 EST 2008 | ashley
hello Vikkaraja, your machine failed to pickup & centering test refuses to stop because the machine cannot determine which Head is currently at which station. on Head A, there is this little "dog" that cuts a sensor somewhere at station 9 on your ma
Electronics Forum | Fri Oct 02 16:49:33 EDT 1998 | Dave F
Benji: I tend to agree with you that assemblers shouldn't wear make-up. I'm unsure what first level assemblers are tho. I've been down that finger cot/glove route ... 1 If someone is going to smear facial or cosmetic oil on a board, they can do
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
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