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December 8, 2008

Simultaneous Double Sided Reflow

What is the process sequence for simultaneous double sided reflow assembly? 

Does this process really save time?

C. H.

Experts Comments

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.

Kris Roberson
Manager of Assembly Technology
Kris Roberson has experience as a machine operator, machine and engineering technician and process engineer for companies including Motorola, and US Robotics. Kris is certified as an Master Instructor in IPC-7711 / 7721, IPC A-610 and IPC J-STD 001.

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.

Edward Zamborsky
Regional Sales Manager
OK International Inc.
Mr. Zamborsky serves as one of OK's technology advisers to the Product Development group. Ed has authored articles and papers on topics such as; Low Volume SMT Assembly, Solder Fume Extraction, SMT Rework, BGA Rework, Lead Free Hand Soldering, Lead Free Visual Inspection and Lead Free Array Rework.
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