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Over the last decades, the number of electrical systems in cars did significantly increase. While electrical side-windows, airbags or air-condition were perceived as luxury in the 1980s, they are now pretty much accepted standard. gas block dimple jig At the same time, the goal of increased engine efficiency meeting tighter and tighter emission regulations calls for many secondary systems, sensors and control units. All these E/E devices require electrical connections, resistant against significant temperature changes, working at high and low temperature, survive contact to moisture and a variety of liquids present under the hood.

Silicone elastomers have the necessary set of properties more than any other elastomer material. The dedicated LSR materials for these applications are self-lubricating to enable the assembly of the electrical contacts attached to the cables. Since more than 30 years especially Liquid Silicone Rubber succeeds in this segment based on its excellent fit for high yield mass production application. But still innovation is highly desired for new challenges in ongoing development.

The ongoing focus on CO 2 reduction drives downsizing and encapsulation of turbocharged engines. gas water heater reviews 2012 As a consequence the heat increases to levels beyond todays design materials’ capabilities, be it cable insulation, plastic housings or the silicone seals. Another trend is ongoing focus on electrification and autonomous driving, contributing to new needs in longterm-sealing performance.

Synthetic amorphous silica is commonly used reinforcing filler in silicone elastomers when significant improvements in mechanical properties such as tensile strength, elongation at break, and tear resistance are needed. The degree of these improvements depends heavily on the type of silicone polymer used as well as the silica type, its concentration, and surface treatment.

Synthetic silica typically used in silicone manufacturing comes in two forms, fumed and precipitated, owing to its manufacturing method. While both types lead to improvements in mechanical properties, the impact on rheology and optical clarity of the silicone compounds can be drastically different. Fumed silica is often used when high transparency is needed due to its unique cluster-like structure and sub-micron aggregate size; precipitated silica, on the other hand, is not typically used for this function. gas unlimited sugar land tx At the same time, both fumed and precipitated silica are often associated with a significant impact on rheological properties, namely, a strong rise in viscosity, often quite undesirable as it leads to compounds which are more difficult to process.

To address the need for strongly reinforcing fillers with minimal effect on rheology, we developed a new family of hydrophobic silica. In this presentation we will demonstrate how these silica products maintain low viscosity of the silicone elastomers while providing reinforcement at acceptable levels of optical clarity. Test results will be shared to highlight how a combination of structure afforded by the production process and special hydrophobic treatment make these new products a very interesting option for LSR compounds with excellent combination of mechanical, rheological and optical properties.

Continuous improvements in part design, mold design, and molding processes are essential for maintaining a competitive edge in the ever-expanding LSR Healthcare molding market. electricity billy elliot instrumental By using advanced CAE simulation technologies, design phases can be shortened, molding process can be predicted, and molded parts can be optimized. To achieve these results, the shear sensitive viscosity behavior of LSR materials should be simulated to accurately predict flow behavior and shear-induced heating effects. New fully automatic BLM (Boundary Layer Mesh) technology can create accurate mesh density in required areas. High shear rates in thin film or pin gates and thin wall thicknesses can cause shear-induced heat which influences viscosity, flow behavior, and flow-induced premature scorch and cure effects.

In this paper, several practical examples will demonstrate how advanced mesh technologies can be used to better predict shear-induced material flow behavior and how to optimize vent and over-flow placements. electricity definition physics In addition, heat balance inside a high cavitation LSR mold with a narrow cavity spacing requirement will be evaluated. Lastly, optimizing heater placement and heater wattage to avoid cold spot conditions that could influence overall cycle time and part cure behavior will be examined.

Markus Landl is Head of International Business Development at the RICO GROUP, a network of professional suppliers for injection molding tools, automation and the production of parts made of elastomers and multi-shot applications. Since November 2015 he is responsible for developing global strategies and he coordinates the development of markets and innovation potentials for the RICO GROUP locations in Austria, Switzerland and the United States. Previously Mr. Landl worked for global acting companies in the areas of tool-making, automation and the development of complete production solutions. He started working as an engineer with focus on parts machining and tool-making and then he became a project manager for worldwide activities in the plastics business. From February 2004 to October 2015 he was employed as an Area Sales Manager and as a Sales Director. electricity year 4 Through his national and international experience, he has a broad network in the industry. Mr. Landl received his Master’s degree in Business Administration from the University of Applied Science in Steyr, Austria.