... machine has the devices of auto temperature controller, vacuum exhaust and circulating oil cooling of screw core. The feeding ... , extruding system parts, dosing part, barrel cooling parts, constant temperature oil tank part, vacuum exhausting part and electric controlling part.(1 ... , nitriding(2) The screw:38CrMoAla alloy steel, nitriding, oil cooling circulating external.(3) Screw diameter(mm): 80/156 ...