February, 2013
www.us-tech.com
Page 71 Future Dispensing and MID Technologies By Adrian Kuhnis, Essemtec, Aesch, Switzerland
dispensing GmbH — a subsidiary of the Essemtec Group — is involved with forming LEDs with filled media, a process that requires flexibility, accuracy and speed that currently can be achieved only by piezo jet valves. Vermes offers two types of valves that provide
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different application forces to the media being dis- pensed. High-viscosity fluids require the direct application of the high force available from the piezo valves. These valves are typically considered to be open, while low viscosity fluids generally call for closed valves. Selecting the right valve, the correct nozzle
and the appropriate valve timing is a demanding task. The process engi- neer must know not only the required cycle time, but must also have a lot of information about the medium rheol- ogy and the application. Rheology
he number of applications for jet valves is growing rapidly, especially for LED manufac- turing and production. Vermes Micro -
technology is now used for making many new high- er-volume products such as antennas for communi- cations devices, as well as automotive and medical applications.
Dispensing and MID (Molded Interconnect Devices) technologies are developing rapidly. Current technology drivers are LED and communication products.
The concept of LDS is rather simple. A prod-
uct is made from an LDS polymer or coated with an LDS paint. The laser then roughs (activates) the areas where copper will be built up in a subse-
quent chemical process. The roughness of the sur- face ensures excellent adhesion of copper on the work piece. Layout changes only require repro- gramming the laser; no tooling costs are involved, and the process is very flexible.
New Design Rules Many types of LDS polymers are available
for different applications, including solderable high-temperature thermoplastics. It is even pos- sible to create vias in LDS technology. Either the laser burns the required via itself, or it activates the surface inside the hole. However, layout designers must become familiar with a couple of new design rules:
Continued on page 74
New Scorpion dispensing machine.
includes such properties as viscosity, thread formation, temperature and fillers. The process engineer also must distinguish between shear thin- ning (no structure rebuilding at rest) and thixotropy (rebuilding of struc- ture at rest). The speed of a jet valve is limit-
ed because of the self-heating of the piezo. 500Hz is a high frequency for a piezo jet valve and 1000Hz can be achieved only for short periods of time. Reaching the required cycle time requires long-term experience. Vermes is currently developing a new technology that soon will go well beyond these limitations.
New Dispensing Machines Jet valves can be installed on
the new Scorpion dispensing machine and the new Paraquda pick-and-place machines from Essemtec. These machines have an innovative valve quick-change system. Because of their very high speed and accuracy, these machines are well prepared for future applications. The Scorpion, a pure dispensing
machine, is used for all types of dot, line and curve dispensing. Automatic calibration systems for height, viscos- ity and needle are included. A com- bined dispensing and placement machine such as the Paraquda is sug- gested for applications including paste adding, glue dot dispensing for some components or electronics pro- totyping.
LDS Technology for MID LDS (Laser Direct Structuring),
a technology developed by LPKF Laser & Electronics AG, is no longer used just for making prototypes. The
Phone [775] 885-9959 • Fax [775] 885-9972 •
www.taiyo-america.com See us at IPC/APEX Booth 2201
COME VISIT US AT IPC EXPO 2013, BOOTH #2201
SEE OUR LATEST LDI SOLDER MASKS, HOLE FILLS & INK JET PRODUCTS!
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