First machinery has concentrated on technical innovation for years and passed the ISO9001:2000 Quality System Certification.The fine alloy steel 38CrMoAIA is adopted to manufacture products after quenched and tempered at high temperature,determining the chemical screw of blow molding machine composition,azotized,and precisely grinded.The screw arbor with high temperature and high speed,which adopts two-phase stainless steel,therm-alloy,Ni60 or sprays cemented carbide powder,is featured by longevity of service,abrasion and corrosion resistance,etc.