HOME > Business Overview > Plastic Product Division > Information Equipment Business As well as the ability to provide EMI (electromagnetic interference) shielding, our expertise in infrared and ultraviolet coatings can add unique value in the production of mobile terminals, audio and visual devices, and digital camera parts. EMI-Shielded Parts Yoshikawa Kasei started manufacturing mobile phone cases early and has now established a triple-point manufacture and supply system including Japan, China, and Malaysia to meet customer needs quickly. Yoshikawa Kasei's products are highly evaluated by both domestic and overseas customers, especially in secondary processing techniques such as EMI (electromagnetic interference) shielding, UV coating, and vapor deposition.   *EMI Shielding Process EMI (electromagnetic interference) occurs when the electromagnetic waves emitted from the circuitry of an operating electronic device affects the operation of another nearby electronic device. High-output office machines and telecommunications devices contain many chips and circuits that emit radio frequency pulses. EMI shielding prevents these pulses from interfering with other devices. Regulations concerning EMI, such as FCC (U.S.A.), VDE (Germany), and VCCI (Japan) standards, are becoming increasingly strict. Yoshikawa Kasei has the expertise to help makers meet tighter standards.   Cross-Sectional Image by Scanning Electron Microscope (SEM) High-frequency ion plating Cu (Copper) + lS (Tin[PB1]) UV-Coated Parts UV coating is indispensable for producing the rich texture of digital cameras. Finished Product Exterior Part Eagerly-awaited low-cost production Three-stage coating, heat-drying, and UV function can be processed in a single line, which enables mass-production of uniform quality products at a speed of 7 meters per minute by setting coating conditions only once. Coating materials can be saved by the use of independent air controls. A special reflector in the drying furnace ensures the maximum utilization of far infrared heater heat source, reducing the heating and electricity expenses. The use of no-pump booth eliminates the need for repair and maintenance. Unparalleled quality improvement Constant automatic coating from beginning to end ensures production of uniform-quality products. The pass-in and quick-return function of the spray gun enables always stable film finishing. The temperature and time settings of the drying furnace can be varied depending on the work material and the type of coating material to improve coating adhesion. The conveyor chain's shock-proof mechanism eliminates irregular work material movement to ensure uniform coating film thickness. Pollution-free production for a new era The high-speed air flow in the no-pump booth directs over-sprayed coating mist to a water tank, which enhances the efficiency of mist elimination. The water tank in a booth is replenished only by the amount of water evaporation to eliminate pollution by waste water. In addition, the use of Gramosol causes trapped mist to deposit as non-viscous sludge, preventing the septic action of water even with long-term use. The mist treatment equipment incorporated in the booth exhauster ensures complete trapping of mist from UV coating materials, providing an excellent antipollution measure. Secondary Molding Processing Vapor Deposition Film Thickness We deposit two-micron thick aluminum films and combined tin-copper layers that are one micron thick. Compared with the decorative aluminum films of 0.03 to 0.07 microns that are formed by standard vapor deposition processes, we achieve extremely thick shielding layers. Shield Performance Our ion-plating layers provide effective shielding against radio-band interference. In fact, our radio-frequency ion-plating layers pass the U.S. Underwriters Laboratories adhesive tape test at class 5B, which means 0% depletion. Adhesion Yoshikawa Kasei's radio-frequency ion-plating layers are certified as class 5B in adhesive tape tests specified in the UL standard. The environment-friendly radio-frequency ion-plating method uses a dry process, producing no environmental pollutants.