Appliance Design - January 2008 - (Page 53)

CHO-BOND 1016 electrically conductive sealant is a single-component RTV silicone filled with nickel-plated graphite particles. SHIELDING/EMI Various shielding materials. developed conductive foams can be used as an inexpensive alternative. Unlike plated foams, Soft-Shield 4850 is composed of electrically conductive fibers integrated into a low-density foam. Since the foam is not plated, the product offers excellent compression for long-term shielding. These Z-axis conductive foams allow OEMs and CEMs the ability to convert roll stock product into various forms which helps minimize costly tooling and optimize higher speed, lower cost conversion operations. Conductive plastics. Injectionmolded plastics that incorporate EMI shielding provide an elegant, versatile and assemblyfriendly solution. They can be used to provide housings for printed circuit board assemblies and they permit details such as internal compartments and integrated mechanical fasteners to be achieved. With their ability to provide an economic solution for many high-volume appliance applications, conductive plastics negate the need for secondary operations, reduce weight, and can cut costs by up to 50 percent compared to die castings, formed metal, machined extrusions, and plated plastic parts. As an example, Chomerics Premier plastic shielding www.applianceDESIGN.com materials use a blend of polycarbonate and ABS engineered for stable electrical, mechanical and physical performance. Using a proprietary process, the base material is filled with long fibers of nickel-plated carbon. The process ensures dense dispersion, random orientation, and full engagement of the fibers to give optimal shielding performance. Adhesives, inks and coatings. These materials do not generally lend themselves to high-volume production unless an automated application process is used to speed throughput and improve repeatability. There are numerous conductive adhesives on the market, these are typically used to bond other conductive materials such as EMI vents, windows, mesh gaskets, or for filling cracks and seams. Conductive coatings and inks provide EMI shielding, antistatic protection, corona shielding, and surface grounding in a wide range of applications. They can be applied to plastic surfaces by painting or for higher volumes, by using conventional spraying equipment. In summary, choosing the right gasket requires knowledge of both electrical and mechanical requirements. Shear forces, environmental effects, compression set, and pricing are just some of the factors that influence which gasket is best for an application. Materials must be both cost-effective as well as compliant with appropriate environmental regulations (RoHs, WEEE, etc.) that require their safe disposal or recycling at the end of the product’s life. For appliance design engineers who do not have to deal with EMI shielding on a day-to-day basis, the learning curve can be very steep unless they seek application support from the shielding material manufacturers themselves. < For more information, enter . . . . . 311 Or email: chomailbox@parker .com SUPPLYI NG PERF OR ATED COMP ONENTS TO OE MS SINCE 1915. Our emphasis on quality, on-time delivery, fair prices and the production of materials in tolerances higher than industry standard has made DIAMOND North America’s leading and largest perforator. Call for our 188 page catalog covering all aspects of the perforating process, material information, company capabilities, tolerances and technical studies data. perf@diamondman.com 2 4 3 W. E I G H T H S T. WYOMING, PA 18644 800.233.9601 (F)570.693.3500 WWW.DIA MONDMAN .COM For more Information Enter 119 applianceDESIGN January 2008 53 12/6/07 10:07:59 AM AD01081Dia.indd 1 http://WWW.DIAMONDMAN.COM http://WWW.DIAMONDMAN.COM http://www.appliancedesign.com

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Appliance Design - January 2008 Contents Editorial Shipments/Forecasts News Watch Makers of Commercial Refrigeration Equipment Turn to Variable-Speed Motors to Improve Energy Efficiency. New Motor Design and Control Scheme Makes Brushless Motors More Economically Feasible for a Wider Range of Applications. External Gas Molding, a Relatively New Technique, Solves Many of the Challenges Associated with the Injection Molding of Large Plastic Parts. Plastic Housings Offer Many Benefits: EMI Protection Isn't One of Them. But, New Materials and Techniques are Solving that Problem. Choosing the Optimal Strategy for Effective EMI Shielding Depends on Both Mechanical and Electrical Requirements Ethernet-Enabled Microcontroller Makes Networking Schemes Easier and More Cost Effective to Implement The Ever-Changing Array of Microcontroller Memory Options Makes it Imperative to Keep Abreast of What's Available to Determine the Optimal Choice for an Application. A Vast Range of Components and Finished Products will be Exhibited at the Country's Preeminent HVAC/R Show, AHR Expo, which is Scheduled for Jan. 22-24 in New York. Advertiser's Index Association Report: PRBA

Appliance Design - January 2008

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