PROCESS FOR BALLING AND FLAME-PROOFING OF POLYSTYRENE

摘要

The subject of the invention is a process for balling and flame-proofing of polystyrene foam preferably recycled polystyrene, during the process an additive is added to the polystyrene by which a polystyrene foam of increased tensile strength is produced and the spreading power of flame of the material produced is inhibited. During the process a raw material of beaded and/or flaked polystyrene is filled into a shaping space where balling with heat-treatment and intromission of hot steam takes place. The process is characterized by that, during balling of polystyrene foam an additive of boric content, a hexabromo-cyclododecane (HBCD) is added to the - partly or wholly recycled - raw material to be balled, and the balling of the raw material provided with the additive this way is executed with intromission of high temperature, preferably of low vapor content steam.