June, 2018
www.us-tech.com Continued from page 59
processed and delivered. The system has integrated vacuum that removes air bubbles from the media during preparation, ensuring that none are
Page 63 Bubble-Free Potting of High-Voltage Capacitors...
essary absence of bubbles. A certain amount of material is dispensed into the housing in a vacuum so that the winding inside is completely covered with potting material. During ventila- tion of the chamber, the epoxy is then pressed deeper into any angles and gaps as it pressurizes. After the mate- rial has been cured for the first time, a final top layer is added. The encapsulation process is fol-
lowed by an optical inspection of the components by the system operator. “It is difficult to check the height
of the encapsulation in the housings automatically, because we already have tolerances in the film thickness
of the winding,” says Tausche. “The material layer on top of the winding should have a certain minimum thick- ness. Generally speaking, a slightly fluctuating filling level is no problem.” In the final curing process, the
potted epoxy is cured in a heat furnace at 176°F (80°C) for two hours and then 230°F (110°C) for another six. The collaboration between
Scheugenpflug, Wevo-Chemie and FTCAP created a powerful and pre- cisely adapted potting process. During development, the experts from Scheugenpflug and Wevo- Chemie were able to provide FTCAP with extensive experience in materi-
als processing and process technolo- gy, significantly aiding start up. “Due to our well-engineered sys-
tem technology, we can guarantee bubble-free encapsulation and high quality for our customers. The auto- mated potting process also allows us to handle larger quantities without any problems,” says Tausche. “When more projects come up, we know who to turn to.” Contact: Scheugenpflug, Inc.,
975 Cobb Place Boulevard, Suite 218, Kennesaw, GA 30144 % 770- 218-0835 fax: 770-218-0931 E-mail:
sales.usa@
scheugenpflug-usa.com Web:
www.scheugenpflug.de r
Dos P016 volumetric piston dispensing system.
present during the potting process. Circulation prevents the fillers in
the material from sedimentation and hermetically sealed material lines, pumps and valves prevent the reintro- duction of air during conveying.
Two-Stage Curing At FTCAP, the capacitors are
manually placed into the encapsula- tion system. The chamber is then depressurized down to 20 mbar. Depending on their sizes, the hous- ings of the high-voltage capacitors are filled with epoxy resin in one or more steps. Large capacitors require multi- stage encapsulation to ensure the nec-
New Touch Encoder Technology Is More Intuitive
Continued from page 61
switch with a touch display, the touch encoder bridges the user gener- ation gap without sacrificing the goal of creating an intuitive user experi- ence. Users can navigate through the interface by swiping and tapping through the touch display while fine adjustment of parameters can be accomplished with the ring encoder. The consistency of the tactile
feedback conveys the traditional expectations of quality, while the bright color display provides a palette to showcase product branding for a positive first impression. The goal of any user interface device is to make the experience of interacting with device both intuitive and enjoy- able. The touch encoder offers prod- uct designers a stylish and versatile interface built with an engineered toughness to perform in the harshest of environments. Contact: Grayhill, Inc., 561
Hillgrove Avenue, La Grange, IL 60525 % 708-354-1040 E-mail:
info@grayhill.com Web:
www.gray-
hill.com r
FULL TEST CAPABILITIES
FLYING PROBE TESTER
FASTEST & MOST ACCURATE Granite chassis eliminates vibrations
LOW COST OF TEST
@
www.spea.com
See at SMT/Hybrid Pkg, Booth 4A-126
NEW
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