How to quickly judge excessive screw and barrel wear during an injection molding machine factory inspection?
• Measure barrel ID at three zones; replace if wear exceeds 0.3mm.
• Pull screw and check compression zone OD; scrap if clearance to barrel over 0.5mm.
• Check non-return valve end clearance; over 0.15mm causes shot backflow.
• Air-purge PET and watch for skewed melt or black smoke to assess plasticizing uniformity.
• Pull screw and check compression zone OD; scrap if clearance to barrel over 0.5mm.
• Check non-return valve end clearance; over 0.15mm causes shot backflow.
• Air-purge PET and watch for skewed melt or black smoke to assess plasticizing uniformity.