3. Cracking to make oil or recovering styrene: The device for cracking waste polystyrene foam to make oil is as follows? Pretreatment and heat treatment of waste polystyrene foam from volume reduction catalytic cracking distillation of styrene. Others: Waste polystyrene foam can be used to make coatings and adhesives. ① Coating: The expandable polystyrene foam can be made into coating by adding appropriate solvent after being crushed, and the polystyrene foam can be molded into polystyrene beads if useful. Foam used for packaging household appliances or frozen food packaging; There are also several instant noodle bowls made of expandable polystyrene beads by injection molding. These plastic products are huge in size and the amount of tuition and miscellaneous fees is large, so their recycling has received special attention in China.