March, 2014
www.us-tech.com
Advanced Drop-Jet Fluxing for Selective Soldering Continued from previous page
The advanced drop-jet flux dis-
a major selective soldering equip- ment manufacturer, rather than attempting to assemble a solution by purchasing off-the-shelf components. The advanced dispenser can be inte- grated side-by-side with a standard aerosol spray head for dual flux dis- pensing capability. This is often needed when both mass flux dispens- ing and precision flux dispensing are required in a selective soldering process. The advanced drop-jet flux dispenser is capable of depositing microscopic amounts of liquid flux with higher accuracy than commer- cial drop-jet fluxers and provides pre- cise on-demand application of flux with no overspray for true no-clean processing.
Flux Chemistry Compatibility While many commercial drop-
jet spray fluxers are presented as capable of handling almost any type of flux, some of these units have incompatibility problems with flux types other than alcohol-based flux- es. Since many lead-free fluxes con- tain a small amount of rosin or syn- thetic resin to enhance their sustain- ability when exposed to the higher elevated processing temperatures encountered when using lead-free solder alloys, this can be a concern.
penser is readily maintainable and serviceable while commercial drop- jet spray fluxers are not. Most com-
solids-content liquid flux or rosin- based fluxes. Since they are sealed units, this generally requires that the entire drop-jet fluxing head be
The advanced drop-jet flux dispenser is readily maintain- able and serviceable while commercial drop-jet spray fluxers are not. Most commercial drop-jet flux heads are sealed units and are therefore non-repairable whenever they become clogged or contaminated with high-solids- content liquid flux or rosin-based fluxes.
mercial drop-jet flux heads are sealed units and are therefore non- repairable whenever they become clogged or contaminated with high-
replaced in the field which is costly and disruptive to production. The advanced drop-jet flux dispenser, with its modular design, is fully
Page 83
maintainable. The internal jetting cartridge can be easily removed for cleaning without complex or expen- sive tools. The advanced drop-jet flux dis-
penser is available with a standard 130µm orifice diameter; other custom orifice diameters are available. The standard orifice is designed to con- trol and dispense a single drop of flux or a continuous pattern less than 2mm wide, ideal for single through- hole terminations close to SMT com- ponents. This is ideal for microscopic deposition to the smallest selective soldering sites without leaving flux residues. The continuous deposition
Continued on page 85
The internal jetting cartridge has been removed from this advanced drop-jet flux applicator for easy cleaning.
The advanced drop-jet flux dis-
penser has rugged yet simple con- struction. It outperforms all other applicators by handling a wide range of flux chemistries including water- soluble fluxes, rosin-based fluxes, low pH fluxes (down to pH2.0), and fluxes with solids content as high as 33 percent. The advanced drop-jet flux dispenser and commercial drop- jet spray fluxers are compatible with alcohol-based fluxes, but that is where the similarity between the two approaches ends. The advanced drop-jet flux dispenser is also com- patible with low-pH, water-soluble, high-solids-content, and rosin-based fluxes, while commercial drop-jet spray fluxers are not (often having incompatibility problems with both water-soluble fluxes and fluxes with solids content greater than 7 per- cent). In some instances, the warran- ty for certain commercial drop-jet spray fluxers may be voided if they are used with high-solids-content fluxes, water-soluble fluxes, or rosin- based fluxes.
See at APEX, Booth 1336
BOARD
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