Daily Maintenance Manual for Blow Molding Machines: Key Details to Extend Lifespan

2025-10-31

Scientific maintenance can extend the service life of blow molding machines by more than 50%, requiring the establishment of a three-level maintenance system—daily, weekly, and monthly.
Daily Maintenance (Every Day)
Before starting up, check the hopper's material level, clear any bottle preforms stuck inside the elevator, and ensure smooth feeding.
Check the cooling system pressure (it should stabilize between 0.2–0.3 MPa), and clean debris from the filter.
Lubricate transmission chains, guide rails, and other components to ensure smooth operation of moving parts.
After shutting down, clean any residual material from the mold cavity and wipe the die head with a soft cloth to prevent plastic from carbonizing and sticking.

Weekly maintenance
Disassemble and clean the feed tray, inspect the alignment accuracy of the bottle preform detection sensor and reflector plate to prevent feeding jams.
Check the precision of the locking mechanism; if any screw fragments from a broken lock pin remain, remove them promptly.
Calibrate the air pressure sensor to ensure the displayed value matches the actual value with a deviation of ≤0.01 MPa.

Monthly Deep Maintenance
Check the electrical system's grounding condition and replace aged wires and contactors.
Measure the clearance between the screw and the barrel; if it exceeds 0.3 mm, rework is required to prevent uneven plasticization.
Perform oil filtration for the hydraulic system, inspect the condition of seals for wear, and replace any leaking O-rings.
Additionally, environmental control is crucial—equipment should be placed in a workshop with temperatures between 15°C and 35°C and humidity levels no higher than 60%, while avoiding exposure to dust and corrosive gases.

Quick Troubleshooting Guide for Blow Molding Machines: A Comparison of Causes and Solutions

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