Hi,
I have a semi-Auto paste stencil machine and use laser cut stainless stencil with T4 paste.
When I start pasting boards the paste covers the pads and is well defined. Throughout the job we have been having some issues with feeder on pick and place and stop sometimes for up to 15 minutes. After a while the paste does not cover the pads well and I am thinking that the paste has room temperature life of hours but the small amounts in apertures maybe dry and clog them? Cleaning the stencil during the run is a hassle.
I am considering it might be best to paste all the boards in a batch instead of stopping and starting.
Is this what some of you do, paste a batch and place them in a rack till needed by pick machine?
(We manually place pasted boards onto conveyor but once in here the machine is connected to re flow oven and carries straight through ok.
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