February, 2018
www.us-tech.com
Precise Measurement of Surface Free Energy Promotes Superior Adhesion
Continued frompage 63
ured using image analysis software. Most of these systems are soft-
ware-controlled to enable direct determination of the precise contact angle and surface free energy, meas- ured in millinewton per meter (mN/m). This value has a direct 1:1 relationship to dyne/cm. In addition, the Krüss equip-
ment can simulate surface treatment process conditions using precision temperature-control methods and other accessories. This enables wet- ting processes to be optimized for each process. For example, contact angle measurements can be carried out at accurately controlled temperatures between –22 and +752°F (–30 and +400°C) or at a precise humidity level. According to Barden, one of the
most important benefits of using advanced drop shape analyzers is the capability to evaluate the polar and dispersive components of surface free energy. Although water is often used for contact angle measurement, it is not sufficient for determining if the surface is polar or dispersive. Instead, multiple types of known liq- uids must be used, the data fed into complex mathematical equations, analyzed and then graphed.
Flex Power Modules Offers New DC-DC Bus Converter
San Jose, CA — Flex Power Modules has introduced its BMR480, an advanced DC-DC bus converter that targets high-end and high-power applications. The converter can han- dle 1,000W of power and 96.2A of peak current. Flex Power Modules is part of the power division of Flex™. The converter comes in a quar-
ter-brick format with dimensions of 2.30 x 1.45 x 0.48 in. (58.4 x 36.8 x 12.19 mm). It operates from a wide 40 to 60V input voltage range and
This type of approach can also
be used to determine if a surface is “oleophobic,” or repels oils. In appli- cations, such as fluorinated coatings, that ideally need to repel water and other organic materials, drop shape analyzers play a key role. When an engineer wants to
bond assorted polymers, he or she will often want to know if they are oleophobic as well as hydrophobic, and the Krüss system provides that information,” explains Barden. Armed with this type of quanti-
tative and qualitative data, plasma experts can then alter surfaces by altering the plasma treatment
applied. Physical plasma, take helium, for example, would create a dispersive surface that allows liquid to spread broadly; oxygen plasma along with a hydroxyl or carboxyl coating could be used to create a polar surface that would alter the spreading mechanism.
Leveraging Surface Analysis PVA TePla offers this technolo-
gy as a service, supported by an in- house team of materials scientists and engineers. With this type of sys- tem, users can dial in precise equa- tions that provide the best options for successful surface treatments. In addition to designing and
manufacturing plasma systems, the company also serves as a contract manufacturer and has the in-house equipment to process materials and conduct a full range of experiments. This provides customers an
opportunity to brainstorm with their technical team and run experiments together. According to Barden, these technical customer/supplier meet- ings often produce the best experi- mental matrices and ideas. Contact: PVA TePla America,
251 Corporate Terrace, Corona, CA 92879 % 951-371-2500 E-mail:
rayc@pvateplaamerica.com Web:
www.pvateplaamerica.com r
Page 65
FLYING PROBE TESTER
FASTEST & MOST ACCURATE Granite chassis eliminates vibrations
LOW COST OF TEST
FULL TEST CAPABILITIES
BMR480 DC-DC bus converter.
offers multiple, tightly-regulated (±2.5 percent) pre-programmed out- puts at 10.4, 12 and 12.5V, but can be factory configured at any voltage between 9 to 13.2V. The converter uses the compa-
ny’s hybrid regulated ratio (RR) tech- nology, which enables better use of the powertrain to deliver high-power conversion across its wide input volt- age range. It offers excellent per- formance for applications that oper- ate in high ambient temperatures with limited airflow, providing power conversion efficiency of up to 97 per- cent at 53V and half load. Contact: Flex, Ltd., 6201
America Center Drive, San Jose, CA 95002 % 408-576-7000 Web:
www.flex.com
@
www.spea.com
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