Development of Electro-Magnetic Powder Process

为开发电磁粉末新工艺，成功地完成了塑料薄膜或陶瓷粉末在不同金属颗粒表面包覆的实验研究工作。实验装置为石英玻璃流态化塑料或陶瓷粉末。为了在床上产生高频电磁场，将高频电源加载到床外侧周围的线圈上，当床内产生电磁场时，不导电的塑料或陶瓷粉末的温度不会改变。然而，从床层顶部进入床层的导电金属颗粒在通过线圈部分时温度会立即升高，并在床层底部冷却。对于陶瓷粉末，将金属温度提高到高于其熔点时，将陶瓷粉末包覆在金属颗粒的表面。对于塑料粉末的情况，增加金属颗粒的温度高于塑料的熔点，塑料薄膜被覆盖在金属颗粒周围。研究还发现，通过改变操作条件，可以控制塑料的胶膜厚度，从而证实了这一新技术可广泛应用于各种废旧塑料的利用。

To develop new electro-magnetic powder process, an experimental research work of plastic film or ceramic powder coating on various metal particles was successfully finished.Experimental apparatus is a quartz-glass fluidized bed to fluidize plastic or ceramic powder. To produce high frequency electron-magnetic field in the bed, high frequency power is loaded to a coil around the out side of the bed.When the electro-magnetic field is produced in the bed, the temperature of non-electro-conductive plastic or ceramic powder is not changed. However, the temperature of the electro-conductive metal particles fed into the bed from the top of the bed are immediacy increased during their passing through the coil part and they are cooled down at the bottom part of the bed. For the case of the ceramic powder, increasing the metal temperature higher than their melting point, the ceramic powder is coated on the surface of the metal particles. For the case of the plastic powder, increasing the temperature of the metal particles higher than the melting point of the plastics, the plastic film is coated around the metal particles. It is also found that the film tickness of the plastics can be controlled by changing operating conditions.It is confirmed by this work that this new technology can be widely applied to utilize various wasted plastics.