|Ask the Experts|
December 8, 2008
Simultaneous Double Sided Reflow
What is the process sequence for simultaneous double sided reflow assembly? Does this process really save time?
|Expert Panel Responses|
Basically you are going to paste the boards, then apply a UV cured adhesive to the first side, place the components and then cure the adhesive. Flip the board, paste, place, reflow. The key is a UV cured epoxy. If you use a slower, heat cured epoxy you are defeating the purpose of the process. Overall it will probably save a few minutes off of the reflow process time. The question is, is the capital for an additional machine, plus the floor space for the glue dot placement available. Remember, you are adding a machine to the line in the form of the glue placement. The UV cue oven may be a little smaller, depending on design so you could balance the floor space requirement there.
Manager of Assembly Technology
Side One: Stencil Solder paste Dispense Adhesive Place Components UV cure the adhesive Flip the assembly Side Two: Stencil Solder paste Place components Reflow both sides simultaneously The process saves the time of one reflow operation, but it adds the adhesive print and cure operation.
Regional Sales Manager
OK International Inc.
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