Short shelf life is relative. We have documented the shelf life of SIPAD
boards of up to 14 months. We also have many samples that are more than 2
years old, have been stored in less than ideal conditions, (in my breif
case, car trunk etc), and they are still very tacky. Also, if for some
reason they do dry out, they can be cleaned and re-fluxed.

As far as a stacker is concerned, SIPAD boards were used in the Easi line
at the Assembly Technology Expo one year, with a stacker system that was
very clever. The boards were placed into the stacker paper side down. A
suction cup handler picked up the board, placed it on the conveyor where
it was carried over a small air knife that blew off the paper, dropping it
into a box underneath. The board transported into an inverter where it was
flipped, tacky side up now, and sent into the pick and place machine.

We have access to this equipment if you are interested.

mk

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