OT: Stupid soldering Idea

It seems like a rather roundabout way to get solder paste applied. It also allows only one layer of particles on top of the pad (since any additional ones won't touch the sticky layer and so will get blown off). That means that the particles must be rather coarse to get enough solder on the pads.

Cheers

Phil Hobbs

soldermask is something different, what you are suggesting is just a worse way of doing what is already standard today, - solder paste (solder powder in flux paste) stenciled or dispensed onto the pcb, stencil thickness controls the amount

-Lasse

pid

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Wouldn't you also need a stencil or dispenser to get the tacky paste onto the pads? If so, your idea appears to be no less difficult than ordinary SMT assembly techniques, which have the advantage of being tried and tested. What is it about them that is bothering you?

-- Joe

Use off-the shelf solder paste - no contamination problems in regards to the paste part in your example. Now the challenge: modify the process to act just like a printing press where water sticks to everything except the image and ink sticks to the image since it is repelled by water. Just like in the printing press example,roll on the (new?) mixture and the solder paste will stick only on copper. place SMT parts were required, do not shake but do bake.

Or, make an inkjet like printhead, only it uses solder paste, not ink. Place board on machine, it 'prints' the solder paste pattern, place parts and bake. Only really useful in a proto house, as in any bulk manufacturing, the stencil is so much faster and cheaper!

Charlie

It's been done. I had a demo board that was treated with their process. You end up with a layer of solder paste that remains tacky for a few months. Parts just stay stuck to the board for the reflow process. I never tried it, I never heard from them again. I think they were a solution in search of a problem. It was a good idea for hobbyist use since you can replace parts until they are OK. Hobbyist == no market.

tupid

hat

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ng

Ditch the powered tin idea and use glitter instead. You may yet lose the hobbyist market, but you'll make it up in volume with the drag queens.

I *am* a drag queen you insensitive clod!

My apologies..... glitter AND sequins then. :)

There's more than one on this group? Who knew? :)

Isn't a drag queen that hot bikini babe that gives the winner a big sloppy kiss at the finish line?

;-) Rich

Nope, that's the one that you don't want to kiss because she has the greatest drag when running after you...

The next thing coming down the pike is OSP.

That is where a film is applied to all the solder pads, and at solder time, it melts, leaving behind a perfectly oxide free surface. Perfect for the higher temp processes of RoHS.

Anyway, OSP is the future, and a lot of customers are beginning to require it.