Appliance Design - August 2007 - (Page 35)

PLASTICS GmbH on a conventional twin screw extruder with a standard screw configuration and a side stuffer feeding device. The density of the raw materials were reduced from 1.04 g/cm3 to 0.84 g/cm3, indicating that all 3M Performance Additives iM30K survived the compounding process. (See photo.) The parts were made on a conventional Klöckner Ferromatic Type FM-250 injectionmolding machine under standard process conditions. Results show that shrinkage of the molded CAF part, particularly in the length and width direction, is significantly lower with the 3M Performance Additives iM30K-filled PP homopolymer compared to the 20 percent talc-filled PP homopolymer. Furthermore, as expected, the part weight could be reduced by approximately 17 percent over the standard part weight while maintaining all relevant mechanical properties. Equally important is the improvement in molding cycle time. The cycle time could be reduced from 16.6 sec. down to 13.2 sec. due to a reduced post pressure and quenching phase. This is most likely due to increased isotropic flow behavior and less material to be quenched. This trial also demonstrates that even very small and thin parts or geometries, such as thin sealing lips or bars, can be molded and filled properly with a 3M™ Performance Additives iM30K-filled PP homopolymer. Furthermore, a reduction in shrinkage marks (sink marks) or dents can be noticed and underline the improvement in dimensional stability. This is most likely due to the small particle size of the new Performance Additives iM30K microspheres. In summary, the experiments suggest that hollow glass microspheres can be used in thermoplastics to reduce weight, mold shrinkage, warpage and CLTE. Other attributes unique to hollow glass microspheres are their low thermal conductivity and low dielectric constant. The use of new high strength microspheres, such as Performance Additives iM30K can also provide the additional benefits of improved survivability during stringent thermoplastic processing conditions and improved mechanical properties of the final composite. < For more information, enter . . . . . . . . . . . . . . . . . 317 Or email: mmm@dynetechnologies.com For more Information Enter 110 www.applianceDESIGN.com applianceDESIGN August 2007 35 Table 1. Grades of 3M microspheres used in experiments. http://www.sur-seal.com http://www.sur-seal.com http://www.appliancedesign.com

Table of Contents Feed for the Digital Edition of Appliance Design - August 2007

Contents Editorial Shipments/Forecasts News Watch A Reed Switch is Simople, yet Versatile, and Designers are Finding New Uses for this Time-Tested Technology A Novel Actuation and Sensing Technology can Register a Light Touch, but Resist Blows from a Hammer Tracing the Source of Noise is Made Easier with Noise Source Identification Methods Appliance Noise can be Annoying, but Designers have Many Material Choices to Help Rein in the Racket Nanocomposites are No Longer a Technology for the Future. These Plastic Materials are Already on the Job A New High-Strength, Low-Density Glass-Microsphere Additive can Improve Plastic Part and Molding Performance A New Electromagnetic Weld/Bonding Process Helps Ensure Long-Term Integrity of Joints in Plastic Parts Snap-Based Technology Eases Installation and Makes Products More Serviceable Two-Part Silicone Adhesives Provide a Rapid-Cure Alternative to Traditional One-Part Silicones Classified DesignMart Advertiser’s Index Association Report: GAMA

Appliance Design - August 2007

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