stencil cleaning

"stencil cleaning" search results in the Electronics Forums

9815 result s found for "stencil cleaning" in the Electronics Forums

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Stencil life

Jun 7, 2018 | Stencil life Hello, the colleagues are all right. What I did in addition to show customers and quality that we either need or dont need a stencil: 1. Made a procedure - in there i defined 50 000 cycles and then the stencil has to be checked by me. In the checks if you have dents on the image, rust, signs of delamination from frame (if you use frames). I also got a special tool to measure the tension of the stencil to see if it is ok. 2. Made a special check list in where i check all that, input the tension results from the 4 corners and the middle 3. Get information from SPI (cpk, trends, defects). If spi

Stencil aperture positional accuracy

Jul 6, 2012 | Stencil aperture positional accuracy I have fabricated a artwork of stencil on a mylar and make comparison on PCB and Stencil in order to confirm if there is any PCB stretching at both end. The results are comparable for both stencil and PCB without any stretching . So,I assumed that there is no PCB stretching for this case. However during printing, we still see printing offsetted for 2-3 mils shift at both end of PCB after get a very good board support during printing. Do you still see any other factor that will contribute to this failure? Btw, I have modify the opening of stencil for 0402 pad from home shape to round shape (solder

Glue "decouple"

Sep 23, 2009 | Santiago can still maintain his current PTH, SMT, Reflow, Glue, Wave solder process flow and print glue with a stencil. In this, the bottom-side [contact-side] of the glue stencil requires cutting pockets that correspond with the clinched PTH leads. Here are links to articles on this type of stencil: * *

BGA Rework - flux dispensinx issue

Nov 4, 2008 | Hi Martin, Have you considered printing the flux with a stencil? Stencils can be used for printing more than just solder paste. Quite regularly people use stencils for printing thermal grease, fluxes, conductive epoxy and more. The thing I like the most about a stencil is that it gives me a consistent print from board to board no matter what operator is performing the process. I typically just print 1/1 with my smt pads, place the bga, and reflow it. I have found these stencils for $80 here

stencil to pcb manufacturing tolerance

Oct 31, 2008 | stencil to pcb manufacturing tolerance Answer on point 2 - I understand you send him gerbers of single PCB (?). In most cases you have panelized PCBs so to avoid problems with stencil first you should order PCBs and ASK your PCB supplier to send you back his gerbers of panel. There are some technological details like V-cut which also need to be considered in dimension manner and it affects distances from PCBs in panel. Once you get gerbers from your PCB manufacturer then you can start stencil design and in my career I have not met so far any problems if you do this way - stencil is always done well according to PCBs. Stencil

0402 aperture design lf

Apr 12, 2007 | There have been many designs of apertures for 0402, round, home plate, inverted home plate and various reduction amounts for square or rectangular apertures. What works best for a given application depends on PCB design, solder land finish, stencil thickness, stencil type (chem-etch, laser or electroform) and solder paste used. The IPC-7525 Stencil Design Guidelines has just been updated this past Feb. It is a great document for only $40.00 Go to and type "IPC-7525" in the Product Search box in the upper left corner of the page. Also, there is a Stencil Design document from Speedline Technologies- MPM called Stencil-Pro. Joe Belmonte can get it to you,

Can UP 2000 printer work with R and L justified stencils?

Aug 1, 2006 | Can UP 2000 printer work with R and L justified stencils? If your frame size is 730mm x 730mm then you can't move it left or right. If it smaller than that then the frame adapter will give you more leeway. I am not too sure by what you mean by "If I had a 6" board, and a stencil with cut-outs for both sides right and left of center, would I have problems ? " Do you mean you have to process two different pcbs of 6" length with the one stencil? ie one image on the right and one on the left? If this is the case then you may have to mask part of the stencil or have some custom offset squeegee blades made to suit. Not noice. From quick measurements

Water Soluble vs. No Clean

May 2, 2006 | Water Soluble vs. No Clean We manufacturer cleaning equipment (full disclosure) so, our answer may seem self-serving. The facts however are accurate and relevant so here I go� Changing from an OA (water soluble) flux to a no-clean flux makes sense. After all, even die-hard cleaning proponents like me can concede the fact that not all assemblies have to be cleaned. Please note the fact that I did not say �not all assemblies would benefit from cleaning�. To be clear, all assemblies benefit from cleaning although the benefits of cleaning may not be fully appreciated on all boards. Matters of use that affect liability

Fine Pitch Stencil Design

Dec 14, 2005 | Fine Pitch Stencil Design good points but to answer your questions... Although i am aware of most of those potentail problems we havent had most of them, fingers crossed. Unfortunately we have 2 sub-contractors doing the PCB palnning and design which mean i have to solve there problems with stencils design. but the original Q was about fine pitch stencil design not pad design. I have had to transfer half of the stencils ihave designed to oher factories with different solder printing machines and have had no complaints... so far working with-in the limits of many different print machine is difficult, I generally

Differences between screen and stencil printing

Dec 16, 2004 | Differences between screen and stencil printing Simple differences. Both processes require a very similar machine platform, controlled motion, vision fiducial recognition and alignment of a substrate (PCB or hybrid ceramic) to the "image", the image being either a stencil (hence stencil printing) or a mesh screen (screen printing). In general , stencil printing has become the defacto standard process for applying a film of solder paste to SMT bare boards (pads only image of the SMT layout is laser cut, etched thru a metal foil)to allow parts to be placed and reflowed further down the line. Stencil printing process may also apply adhesive dots

clean process vs non clean process

Apr 4, 2004 | Hi Ken I'm not so sure about the voltage level but I'm dealing with backplane boards. Michael,

PCB post reflow cleaning

Mar 26, 2004 | PCB post reflow cleaning Id also like to know how this is possible. I am skeptical and would venture to say that it only looks clean but actually is not. Hopefully I am wrong and tests show there is actually no residue so we can save lots of $$$ here. Thanks

Cleaning Water Soluble Flux under BGA's

Mar 24, 2004 | Cleaning Water Soluble Flux under BGA's Hi Dave, Can you elaborate more on the Saponifier system process and the surface tension during aquaeous cleaning? thanks and regards,

No Clean vs. RMA

Mar 24, 2004 | No Clean vs. RMA RA and RMA flux residues are "sealed" in a hard, glassy coating that do not require cleaning in many end-use environments. That being said, automotive, automotive underhood, and deep well are in that [ascending] order the three most burtal environments for electrinic equipment.

No-Clean Wave Flux - Water Wash

Mar 24, 2004 | No-Clean Wave Flux - Water Wash No-clean flux residues can be either cleanable or not cleanable. The not cleanable type leave a milky white residue on the solder connection after suitable soaking in water. Your flux supplier will have suggestions on the appropriate flux.

No-clean reflow profile

Mar 24, 2004 | No-clean reflow profile Hi, Guys, Can anybody tell me what kind of reflow profile is best for a no clean solder paste: Ramp-Soak-Spike or Ramp-to Spike? The paste we are using is AIM 293DX2B. Thanks a lot.

Cleaner device for PCB

Feb 2, 2004 | Do you bake the boards after 30 minute submersion? Parts and boards are netoriously hydroscopic. What do you do to combat organcis in solution? How do you know your boards are "clean"? Clean is differnet things to different people. Just currious.

Tarnished surface upon cleaning with DI water + saponifier

Dec 17, 2003 | Tarnished surface upon cleaning with DI water + saponifier Anyone who has experienced and resolved tarnishing of Aluminium surface upon cleaning with DI water + saponifier. The aluminium surface is protected with conversion coating (clear) which is turning black when exposed to saponifier solution.

Batch Cleaners

Oct 17, 2003 | we will be using water soluble solder paste. cleaning will be for smt assemblies only. waste water will be treated prior to disposal. as far as testing for cleanliness, any suggestions or recommendations on test equipment would be greatly appreciated. we will only clean boards on this one product

Soldering Lead-Free Components with Leaded Paste

Aug 7, 2003 | Anyone have experience soldering Lead-free components using leaded solder paste? I'm specifically interested in lead based no-clean solder paste. Any special concerns for reflow? Kyzen Cleaning? Thanks, Greg



Clean Solder paste

Jun 12, 2003 | Clean Solder paste I need active solder paste to overcome solderability problems - I believe it have to be washed out, the issue is not the cleaning process only the paste (flux) activity level.

Clean Solder paste

Jun 11, 2003 | Clean Solder paste Please help us understand better what you seek. Is it: * Cleanable low residue solder paste * No-clean solder paste * Someother paste

Clean Solder paste

Jun 10, 2003 | Clean Solder paste Hello, I need some info. about CLEAN (Resin) solder pastes (manufacturers & P/N), not water solouble not RMA. Thanks Roni

Aqueous Board Cleaning

May 19, 2003 | Aqueous Board Cleaning Hello. We have a low profile LCC on a board. The clearance is ~ 2mils after reflow. Cleaning away residual flux with an ultrasonic 50C water cleaner caused some LCC and 0201 components to loosen. Should we stay away from the ultrasonic cleaner? Thanks.

Inline Washers

Mar 10, 2003 | James: So, why don't you clean your no-clean? At least then you stand a chance of doing class 2 and class 3 work.

White residue after cleaning with IPA

Jan 31, 2003 | White residue after cleaning with IPA EC7M is clean up solvent that can help to prevent white residue problem. It made from Orange shield. Good luck

Solder and flux

Oct 23, 2002 | Yer not making this easy. What kind of flux? If no-clean flux, what controls are you using to assure you are: * Applying the correct amount of flux? * Properly activating the flux? If water washable flux, talk to us about your cleaning methods and controls.

Solder Paste and fine pitch components

Sep 18, 2002 | steps are straightforward. If design factors are incorrect, either fix the design or you are forced to find work arounds that may compromise your ability to produce a defect free product. Secondly, pay close attention to your stencil apertures. Oversized or 1:1 ratio apertures in 15 mil pitch can and will cause bridging. Learn about and incorporate aspect ratio rules for your stencil design. Search the archives in this website for info on aspect ratio and stencil design rules. Third - validate correct alignment of stencil to PCB. An offset of 3-5 mils in any direction can cause paste to be deposited that encourages defects during reflow. Fourth - back to design of PCB. Are there solder dams of mask between the pads? If yes, that helps. If not, pay close attention to stencil aperture width and be sure that the aperture deposits less paste by 1-2 mils per pad, centered on the pad. Next - paste volume

Sony HandyCam 8mm tracking?

Aug 5, 2002 | You must try cleaning the heads with a wet head cleaner. Dry tape cleaner just scratches your heads. Demagnetizer is good to use after a good cleaning.

No Clean Selective Solder

Aug 1, 2002 | No Clean Selective Solder Hi Pete, That's what I thought originally. The equipment manufacturer stated that this was common among No Clean Selective solder applications. I was trying to get a feel for the validity of this statement. It seems to me that there would be a lot of ruckus regarding this subject if it were true

Cleaning Indium TACFLUX007

Jul 31, 2002 | Cleaning Indium TACFLUX007 Stephen, Magic!! Soldering in the N2 environment did just as you said. Easy to clean the post solder residues. Many Thanks!

No Clean Selective Solder

Jul 31, 2002 | No Clean Selective Solder Chris, What's the board finish? HASL? What's the frequency of solder beading, like how many joints soldered exhibit these solder beads- percentage wise. Are the boards clean- nobody is touching them with greasy fingers? We need more clues.

No Clean Selective Solder

Jul 31, 2002 | No Clean Selective Solder Christopher, Is it possible to get some more info like type of no-clean flux you use and process parameters topside temp of board before entering the wave and dwell time in the wave. Patrick Interflux USA, Inc.

Cleaning of Entek Boards

Jul 18, 2002 | Cleaning of Entek Boards Hi, Currently my company is running entek coated boards. But whenever there is a misprint, we cannot wash the boards as it would diminish the coating. Is there anyway to clean the boards without removing the coating or is there a way to re-coat the entek layer ?? Please advise.

Cleaning Indium TACFLUX007

Jun 14, 2002 | Cleaning Indium TACFLUX007 Pete, Holy crap 320C peak !!! What the heck are you soldering ?Is the residue charred, or brown ? I am familiar with TACFLUX009, is tack flux 007 NO-clean ? Need more info.....

Solder Balls in Vias

Jun 4, 2002 | Another thing we see is solder balls (sometimes fines, sometimes larger stuff) in the vias after a misprint has been poorly cleaned, as in wiped down but not washed. They end up in the plated through holes too, but those get nicely cleaned up in the wave.

changing from no-clean to clean

May 21, 2002 | changing from no-clean to clean Larry, Yes, no matter how much you�d like to avoid using NC, you probably will have to start using the stuff, if the design [sales, in your case] types have their way. We can clean WS under 1mm and 1.25mm pitch BGA. For 0.8mm pitch BGA, we use NC. We cannot remove the WS flux residue from under 0.8mm pitch efficiently. Recognize that the effectiveness of your cleaning depends on a variety of factors [ie, flux res materials and stubbornness, stand-off height, flood characteristic of your cleaner, slipperiness of your water, etc.]. Consider: * Getting some sample boards [or thermal glass

Conformal over No-Clean

Apr 26, 2002 | Conformal over No-Clean I worked for a telecom company that had sites in the deserts, jungles, mountains and regular built up area's. All boards were built using Aim 291/293 No clean solder paste. (all boards built to Bellcore standard) The boards were coated with Dymax urethane confroaml coat for obvious reasons .No adhesion problems. In the five years at the telecom company i did not see any boards returned for confromal coat adhesion problems. There were units operating in the field for 10 or more years that were built with no-clean solder paste, coated with urethane coating. No-clean flux off the wave solder

Solder paste for RF boards

Apr 15, 2002 | Does anyone know of a No Clean solder paste that works well with RF boards. I have tried no clean in the past, and the boards have failed miserably

Old relay oxidized

Dec 5, 2001 | What is the best way/material to clean leads with 20% copper exposed that have been sitting in a stock room for a couple of years. My process uses NC flux 263 from AIM and I want to stay with the NO-Clean as much as possible!

Board Cleaning

Dec 3, 2001 | Board Cleaning In a LARGE degree, the residues being cleaned dictate the selection of an effective saponifier. Your washer supplier may be a good source of suggestions. Many saponifiers present potential VOC issues, because of their use of alcohol. Try: Kyzen Aquanox, Lonox formulations, and Envirosense

Odd Form parts

Sep 12, 2001 | how to clean pc-boards from the NY disaster I have been asked to find a way to clean pc-boards (telecom)equipment covered with the dust and dirt from the Twin Tower destruction. Any Ideas??

Clean vs No Clean PCB assembly process

Jul 29, 2001 | Tough to say. The residues from fluxes vary according to the suppliers' forulations. Consider:

Clean vs No Clean PCB assembly process

Jul 26, 2001 | John, Are these spots the result of repair? I notice a lot of repair people love to squirt flux

solder balls

Jul 18, 2001 | Steve, To clean the RMA processed boards, u hv to make sure u talk to the supplier first, then get the right saponifier and do semi-aqueous cleaning.

Recommendations for ultrasonic cleaning solution

Jul 11, 2001 | Recommendations for ultrasonic cleaning solution Your selections are good, assuming you are talking about cleaning raw paste, rather than reflowed RMA. Maybe add Multicore Prozone, JNJ Aquasonic, and Kyzen Aquanox.

Mixing no-clean solder with activated

Jun 19, 2001 | Mixing no-clean solder with activated So, they want you to talk through a justification for mixing fluxes? That's GREAT, if you can get away with it!!! Tell us more about Safety Clean.

effective liquor for cleaning the residues in reflow oven

Jun 13, 2001 | effective liquor for cleaning the residues in reflow oven I use BioAct SC-10 and it seems to work pretty well. The best bet is to contact your solder paste manufacturer and ask them for a recommended cleaning solvent for the flux residues... Regards, Justin

effective liquor for cleaning the residues in reflow oven

Jun 12, 2001 | effective liquor for cleaning the residues in reflow oven As you know there will be a lot of residues(such as rosin) left especialy on the peak zone and cooling zone of reflow oven after reflow soldering in a time. who use one kind of effective liquor or effective method to clean the residues ?

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