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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Help required selecting reflow oven

Jun 27, 2019 | Hi, I have a small assembly line that consists of a Semi-Automatic Stencil machine, a Samsung Pick and Place, a small IR reflow oven and a wave soldering machine. The reflow oven is presenting the biggest bottleneck. The machine is a small IR (T960) machine is a 5-zone that has 3 heaters above

Please Help: Pace TF 1800 or Finetech CorePlus

Apr 2, 2019 | capability but we used stencils that allowed you to apply paste to the BGA solder balls themselves. It also has a really cool underside heater that can be adjusted so that it gets much closer to the bottom of a pc board, which makes it easier to reflow tough massive boards. I believe it has 0201 placement

Compact Reflow Ovens?

Mar 19, 2018 | Another critical part of a process with a large board is support. Most commonly this is a bed of pins e.g something like red-e-set but there are other solutions. Support with a large panel will be critical for printing to get a good gasket between PCB and stencil and fairly important during

DE-IONIZED WATER SUPPLIERS

Sep 9, 1999 | | Hello SMTNEtters': | | Does anyone know of any suppliers who can supply De-I H20 (some high-quality H20!!) in 55 gallon containers. | | We have no use for "point-of-use" treatment, like mixed bed, anion, or cation tanks, or anything like that...we're a NO-CLEAN shop. | | We just basically

glue strangeness

Sep 7, 1999 | depanalisation stage ? how to they get moved round the shop ? | Easiest way is to to a bit of house keeping first and clean all the benches your working with then do the run, if there are component's left after it then you've found one of the problems. | | JohnW | | John is right. If the part is near

Aqueous Process

Sep 5, 1999 | | I have been running a Stoelting Aquaeous machine and has been performing very well however. the maintanance dept cleaned using the descaler and now we are seeing boards with a removable thin film. We are going to to drain all the water and change all the carbon beds will this be a good start. I

glue strangeness

Sep 2, 1999 | to they get moved round the shop ? Easiest way is to to a bit of house keeping first and clean all the benches your working with then do the run, if there are component's left after it then you've found one of the problems. JohnW

Wave solder mystery

Aug 27, 1999 | solder at the top of the fillet but not at the bottom. This ALWAYS happens on joint where the clinched leads trail out of the wave. If I re-run the board a second time in the reverse direction the bad joint will become good and good joints will become bad. I have profiled to my no clean chemistry

Wave solder mystery

Aug 27, 1999 | good and good joints will become bad. I have profiled to my no clean chemistry and have tried 6 thru 7 degree wave angle. Anyone have any thoughts! | Thanks in advance. | |

Micropax continued

Aug 25, 1999 | toiling to develop a brand new process, over three hours, the thing works. | | Of course, without my incredible talents and efforts, it never would have done it. BS, this machine melted solder fast, made removal easy and, most amazing to me, actually cleaned out those little tiny holes in a flash

Micropax continued

Aug 24, 1999 | , over three hours, the thing works. Of course, without my incredible talents and efforts, it never would have done it. BS, this machine melted solder fast, made removal easy and, most amazing to me, actually cleaned out those little tiny holes in a flash. Now, back to DFM/CE. Probably

Cleaning Electroplated Solder

Aug 21, 1999 | Re: Cleaning Electroplated Solder

Electroless Tin Plating

Aug 20, 1999 | the advantage of being as "intimate" with the board's copper surface, and below, as electroplated chemistries and processes. This makes it a bit analog to HASL in one respect. | | | | The last process the board's surface, before immersion or HASLing, must render it perfectly clean so specified adherence

Electroless Tin Plating

Aug 20, 1999 | as "intimate" with the board's copper surface, and below, as electroplated chemistries and processes. This makes it a bit analog to HASL in one respect. | | The last process the board's surface, before immersion or HASLing, must render it perfectly clean so specified adherence is assured. This often

Electroless Tin Plating

Aug 20, 1999 | " with the board's copper surface, and below, as electroplated chemistries and processes. This makes it a bit analog to HASL in one respect. The last process the board's surface, before immersion or HASLing, must render it perfectly clean so specified adherence is assured. This often is not done, nor can

Serious stuff

Aug 19, 1999 | with residual solder left on the pads, so we cleaned them extremely well. It helped fight this fire, on to the next. Doug

REFLOWING WHITE TIN PLATED PADS

Aug 18, 1999 | | WE ARE CURRENTLY HAVING PROBLEMS REFLOWING BOARDS WITH WHITE TIN PLATING. WE ARE NOT GETTING GOOD WETTING ON THE PADS. | WE HAVE CHECKED THE REFLOW PROFILE AND TRIED DIFFERENT PASTE'S. | WE THINK THERE MAY BE CONTAMINATION OR OXIDATION ON THE PADS. | IS THERE A WAY OF CLEANING THE BOARDS

Parylene Coating of Plastic Parts

Aug 5, 1999 | ). | | My thanks for the prompt by Dave F. - Hello Dave! Now, Dave W.. I understand the logic but the purpose of conformal coating of a finished assembly is to protect the exposed solder joints/legs etc.. There would be no advantage to pre-coating the plastic components as you MUST leave these legs "clean

Ghost circuit shorts under smt resisters only when they are located on solder side of pcb (glued down)

Jul 23, 1999 | and aqueusient cleaning operation. However the epoxy vendor and labs say they have never seen this problem. Meanwhile we are having to Burn-in product for at least a month to prove the pcb quality.

What's a good sub for 1,1,1-trichloroethylene

Jul 22, 1999 | is desired) (201) 434-6778 Additional saponifier manufacturers include: Envirosense (408) 432-4900 Kester (847) 297-1600 Kyzen (615) 831-0888 Petrofirm (904) 261-8286 Other chemicals (other than saponifiers) are also very effective in rosin and no-clean flux / paste removal. Manufacturers include

BGAs and vapor phase

Jul 19, 1999 | -system with infrared preheating and second preheating-stop in the unsaturated vapourzone. | We use 8 layer multilayer-boards in Ni/Au and no clean 63/37 paste. | All I hope is that our subcontractors do a similar good job with their convection-systems. | | Wolfgang | | Thanks for the input on your process. | We

BGAs and vapor phase

Jul 19, 1999 | -stop in the unsaturated vapourzone. We use 8 layer multilayer-boards in Ni/Au and no clean 63/37 paste. All I hope is that our subcontractors do a similar good job with their convection-systems. Wolfgang

ESD Floor Tile

Jul 15, 1999 | and conductive integrity. | | Earl Moon | We have a 3M floor and although it does require a good cleaning program it is not high maintenence. 3M will also do quarterly ESD audits and give you a compliance cert. (no extra charge) As far as hydrostatic presure due to barier breaks we have a couple of small

Andon BGA Socket Soldering Problem - Ball Collapse

Jul 15, 1999 | | | I am trying to solder a 388 ball BGA to an Andon Electronics Corp. BGA socket adapter and I am having problems in the reflow of this part. I put no clean paste flux in the solder cups of the adapter then put the BGA part onto the adapter and run it through a Heller 988C air reflow convection

Andon BGA Socket Soldering Problem - Ball Collapse

Jul 14, 1999 | | I am trying to solder a 388 ball BGA to an Andon Electronics Corp. BGA socket adapter and I am having problems in the reflow of this part. I put no clean paste flux in the solder cups of the adapter then put the BGA part onto the adapter and run it through a Heller 988C air reflow convection

Andon BGA Socket Soldering Problem - Ball Collapse

Jul 14, 1999 | | I am trying to solder a 388 ball BGA to an Andon Electronics Corp. BGA socket adapter and I am having problems in the reflow of this part. I put no clean paste flux in the solder cups of the adapter then put the BGA part onto the adapter and run it through a Heller 988C air reflow convection

Wave solder edge covers

Jul 1, 1999 | 's not likely. Try the Kapton tape to eliminate the possibility of the flux being the problem and see what happens. There are cheaper tapes that will survive. I use the Stevens (?) finger covers every day but only on gold and with no clean. Could there be some sort of contamination inside the covers

Wave Soldering DPPM

Jun 15, 1999 | The other answers on this thread are realistic but it also depends: a) on the quality and finish of the components and PCB (including, of course, solderability) b) the flux type (I would expect lower defect rates with water-soluble than with the less corrosive "no-clean" types) c) the type of wave

quoting smt

Jun 9, 1999 | requirements You need to create models for through hole, smt auto place hand-add, cable harness, testing, cleaning, specials etc. Evaluate each process and determin cost of opperation for direct labor and indirect labor. Re-evaluate each quote for performance. What went well / what did not go so well

Need Wave Solder Help (SMT)

May 26, 1999 | items to check; 1- What are the orientation of the SOT's to the conveyor? The SOT body should be parallel to the conveyor to prevent shadowing. 2- Is the chip nozzle cleaned out? We have to watch this very closely, the holes get plugged and we can begin to get consistant 'misses' in about the same

The care and feeding of adhesive nozzles

May 25, 1999 | carcinogen, to boot. You do NOT want to bring the material into your facility if you don't have it already.....the waste stream nightmare begins..... | | Why don't you get a list of the solvents / cleaning solutions you currently have resident in your waste stream, and run it by Loctite for the application

The care and feeding of adhesive nozzles

May 25, 1999 | NOT want to bring the material into your facility if you don't have it already.....the waste stream nightmare begins..... Why don't you get a list of the solvents / cleaning solutions you currently have resident in your waste stream, and run it by Loctite for the application? Scott

VOC Free Flux

May 19, 1999 | Wes, I have been involved with many customers changing over from an alcohol based no-clean to a VOC-free process. The change-over can be made easier by such things as air movement, convection preheat, "drains" or reliefs in pallets (if used), controlled deposition of flux, and temp profiling

Wes' question on VOC-FREE flux

May 19, 1999 | Wes, I have been involved with many customers changing over from an alcohol based no-clean to a VOC-free process. The change-over can be made easier by such things as air movement, convection preheat, "drains" or reliefs in pallets (if used), controlled deposition of flux, and temp profiling

Radial capacitors have water gain

May 10, 1999 | response from them, as well. We would rack up the boards with the pregnant caps, and just have repair people swap 'em out. Like you, Chrys, i left the company without ever fully resolving this problem!! ...so much nicer now to be in a "no-clean" environment.

Radial capacitors have water gain

May 10, 1999 | . Hey, SM technology is producing smaller clearances to clean and greater density, the preasure (pun intended) is toward higher preasures. The water temperature is already at the minimum specified by the flux manufactures. Most vendors claim only a few shops have these problems. I've profiled

White Tin

Apr 28, 1999 | experience with this type of board coating? | Hi Frank! Long time, no chat. Hope all is going well for you. Recently, I processed several hundred boards with the Omikron coating. I loved the stuff. It soldered great but we used an RMA process. I'm not sure how the no-clean you are currently using would

Cleaning procedures for Entek-Plus Cu-106A

Apr 25, 1999 | Re: Cleaning procedures for Entek-Plus Cu-106A

Bench marking Wave Solder

Apr 23, 1999 | . No actives on the solder side, but 1206's, 805's and SOT-23's. Through hole pitch is 100 mil centers. We run an Electrovert Econopak Plus, with 3 convection preheats, nitrogen, rotary chip wave, and hot gas debridging knife. We use a USI Opti-Flux fluxer with Alpha NR 310-B VOC-free no-clean flux. Our

Re: Discoloring of Soldermask and silkscreen

Apr 19, 1999 | | Netters, | | When I reflow a PCB there is a discoloration of silkscreen and mask. It appears if Profile is too hot! But I dont think so, maybe I'm wrong? | | 1. Kester 293 no clean | 2. 2.1 C/s for 30s to 150 C | 3. .5 - .7 C/s for 60s to 185 C | 4. 1.5 C/s until 210 C for 30s | | I

Re: Discoloring of Soldermask and silkscreen

Apr 19, 1999 | | Netters, | | When I reflow a PCB there is a discoloration of silkscreen and mask. It appears if Profile is too hot! But I dont think so, maybe I'm wrong? | | 1. Kester 293 no clean | 2. 2.1 C/s for 30s to 150 C | 3. .5 - .7 C/s for 60s to 185 C | 4. 1.5 C/s until 210 C for 30s | | I

Re: Discoloring of Soldermask and silkscreen

Apr 13, 1999 | | Netters, | | When I reflow a PCB there is a discoloration of silkscreen and mask. It appears if Profile is too hot! But I dont think so, maybe I'm wrong? | | 1. Kester 293 no clean | 2. 2.1 C/s for 30s to 150 C | 3. .5 - .7 C/s for 60s to 185 C | 4. 1.5 C/s until 210 C for 30s | | I

Re: Discoloring of Soldermask and silkscreen

Apr 12, 1999 | Netters, When I reflow a PCB there is a discoloration of silkscreen and mask. It appears if Profile is too hot! But I dont think so, maybe I'm wrong? 1. Kester 293 no clean 2. 2.1 C/s for 30s to 150 C 3. .5 - .7 C/s for 60s to 185 C 4. 1.5 C/s until 210 C for 30s I preheat to 150 for about

Choosing a spray fluxer.

Apr 8, 1999 | | | I am getting ready to purchase a spray fluxing system for a no-clean process. I have narrowed it down to the Nordson or Dover system. Does anyone have any experience with either. If so can you relate with me. I am a little leary of the Nordson because of the fixed head on bigger boards

DI water

Mar 30, 1999 | etc..) in their DI system? | I'm using strictly Carbon and a Resin Mixed bed combination from US Filters. Resistivity is above 15 Megs and I rotate one of the two mixed beds out about every 6 weeks, I clean an average of 60,000 boards a month both PTH and SMT. I keep the water circulating 24 hours

Chip Resistor Failure

Mar 24, 1999 | was built? Sometimes organic fluxes can cause corrosion if they are not cleaned off properly. Also if a component overheats often enough it can cause oxidation. I'm not sure if I understood the question the way you intended. Please respond if this helps. | | | | Ben K. | | | | It is a corrosion failure ie

Chip Resistor Failure

Mar 23, 1999 | corrosion if they are not cleaned off properly. Also if a component overheats often enough it can cause oxidation. I'm not sure if I understood the question the way you intended. Please respond if this helps. | | Ben K. | | It is a corrosion failure ie the connection between the silver termination

Solder paste temp Humidity controls

Mar 10, 1999 | paste mfr. Call ESP and find out how succeptible their RMA paste is to the environment. Generally, Water soluble formulas are extremely hydroscopic, no-cleans are environmentally resistive, and RMA is somewhere in between. I've run an RMA process for some time and never really noticed slumping

Good Solder Joint Failures

Feb 16, 1999 | and it passes test. The frequency of this issue is very low (though no ppm data is available at this time) but it is enough for concern. There seems to be no pattern to location, part type or board. We use primarily no-clean solder paste. | I have asked for samples from future occurances. These will be viewed

Good Solder Joint Failures

Feb 15, 1999 | and it passes test. The frequency of this issue is very low (though no ppm data is available at this time) but it is enough for concern. There seems to be no pattern to location, part type or board. We use primarily no-clean solder paste. | I have asked for samples from future occurances. These will be viewed

Defluxing Advanced Packages

Led testing color sensors