... the devices of auto temperature controller, vacuum exhaust and circulating oil cooling of screw core. The feeding way is forced ... 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(4) Effective ...