PET PLA Plastic Sheet has high transparency, good mechanical property and poisonless and tasteless environmental feature, being widely used in food, medicine, toy, electronic, gift, clothes, stationery, etc field. But shen it in extruding process, the moisture feature of PET may be reduce the product quality. The exhaust Single Screw Sheet Extruder has high efficiency vacuum exhausting ability, melting temperature curve accurately, melted things with good dispersion.