... 3 CE,ISO900certificate PS Lunch Box Machine (TH1100/1250) make ps foam tray,burger box,fast food box,egg tray,bowl and ... polystyrene granule. In the extruding process, vesicant is injected at high pressure. After extruding , foaming, cooling, shaping and hauling off ... the working programme .It is easy to operate and of high efficiency .It features reliable stability ,large forming area ,fast ...