| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a specific gravity screening method for performing highly precise screening of waste plastics ranging from high specific gravity material to low specific gravity material with the same method and apparatus without necessitating the use of many kinds of specific gravity liquids, and for simultaneously screening many kinds of materials. <P>SOLUTION: A screen whose opening is smaller than the size of particles to be screened is arranged in a medium whose specific gravity is larger than that of the particles to be screened, the particles to be screened are arranged under the screen, the screen is intermittently vertically operated or intermittently downward flow is caused, thereby, the particles to be screened are forcibly sedimented or floated and the particles to be screened are stratified and screened by the specific gravity under the screen. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
