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MID AMERICA Taping and Reeling, Inc.
www.us-tech.com
630.629.6646
www.matr.com
May, 2021
Meeting EV Safety and Quality Demands....
Continued from page 57
bodies (e.g., dark components) and measuring offset, twisting, component height, component
tilt, coplanarity, the height of individual pins, wobble circle, sol- der volume, and solder profile. 3D methods pro-
Tape and Reel Service & Supplies Surface Mount Axial / Radial Custom Carrier
vide an x/y-resolution of 10 µm and a z-resolu- tion of 1 µm. These methods combined with improved algorithms make it possible to ana- lyze the image data in the sub-pixel range. With a combination of 2D and 3D AOI meth- ods, measuring and inspec tion results can be further enhanced. AOI systems achieve a simi-
to wirebond inspection also enables more accurate measure- ment, due to the additional height information.
X-ray image showing multiple voids at high resolution.
larly high level of precision as special measuring microscopes, but they do so at a speed required for inline inspection. The migration of 3D technology
Trays Vacuum Sealers Programming 121 Exchange Blvd Glendale Heights, IL 60139 Contact: Viscom, Inc., 1775
Breckinridge Parkway, Suite 500, Duluth, GA 30096 % 678-966-9835 E-mail:
info@viscomusa.com Web:
www.viscom.com r
See at NEPCON China, Booth 1J20
The Benefits of Dispensing Thermal Interface Materials
Continued from page 60
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heat cure, and two-component materials are all available. Nearly all dispensable options are filled with aluminum oxide, otherwise known as alumina.
A2O3 is a relatively good thermal conductor and is electrically insulating. Glass beads are also commonly used for electrical insulation. The overall conductance of the TIM is usually dependent on
the density of the A2O3 in the mixture. A2O3 happens to be a particularly hard and abrasive
filler, with a Mohs hardness of roughly 9. Because of this, pump- ing equipment and plumbing must be carefully selected to minimize settling of this filler and to prevent abrasion to seals and moving parts. PVA designs dispensing
equipment for handling material with these specific properties in mind. Pumping and dispensing equipment is carefully designed to maximize life. Moving components are con-
structed of materials selected for their resilience, such as tungsten carbide. Soft seals are limited in quantity and designed in such a way that they can be readily replaced without introducing sig- nificant downtime. Fluid routing and plumbing
sales@displayvisions.com
www.displayvisions.com
is designed to minimize back pressure to the system and reduce dead space. For example, instead of using a 90° fitting,
which completely changes flow velocity, a sweep or bent tube fit- ting would be used to prevent packing of fillers.
Curing and Handling Pre-cured gels eliminate the
need for mixing or post-applica- tion curing operations. Once the material has been dispensed onto the component, it is then ready for assembly. Pre-cured materials are packaged in the same form as they will be dis- pensed on the product. The con- sistency must be flowable enough to be dispensed, but thick enough to maintain its shape on the electrical compo- nent. PVA has designed equip- ment for extruding the precured material at high pressure through a flexible hose to the point of dispense with a single moving ram. The one-gallon pail unloader
(1GPU) uses a hydraulically driven ram to extrude the mate- rial at pressures up to 800 psi. The design takes advantage of the original packaging of the TIM gel and is also available in a five-gallon configuration. The ram’s only wearable component is a gasket which can be easily replaced between pails. Alternative methods for
pumping pre-cured gels usually include piston pumps, which are notorious for frequent labor intensive rebuilds.
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