Blow Molding Machine Safety Operation Procedures and Essential Precautions

Blow Molding Machine Operating Requirements

• Before starting the heating system for production, first open the cooling water valve and verify the water passages are unobstructed.
• Close the main power switch on the control cabinet side to connect internal power, then press the motor start button on the panel to start the oil pump motor.
• For machines being used for the first time or after extended inactivity, allow the oil pump to run idle for several minutes after startup before beginning operations.
• Turn on the heating switch, connect the electric heating power supply, adjust the temperature control settings, set the target temperature, and observe the ammeter reading to verify the condition of the heating rings.
• Conduct trial runs progressing from Manual to Semi-Automatic to Fully Automatic modes. Simultaneously check that all critical fastening bolts are properly tightened. Stop immediately if abnormalities are detected. Resume trial runs only after confirming normal operation or resolving issues.
• When switching from dark-colored materials to light-colored materials, clean the barrel while it is heated, adding a suitable amount of cleaning agent for faster and thorough cleaning. Note: Always clean the feeding machine first. When alternating between two materials, adjust the temperature settings based on the higher melting point material requirement.
• When stopping production, press the motor stop button, wall thickness stop button, and material extrusion stop button to shut down the motor, then finally switch off the main power to end the operation.

Key Operating Precautions

Temperature and Material Safety

• Always ensure sufficient equipment heat-soaking time before production. For machines that have just started or have been idle while heated, perform a material injection test first to confirm no material ejection hazards exist before normal production begins.
• Never reach into the mold clamping mechanism while the machine is running. When repairing molds, always shut down the oil pump motor first.
• When no material is present in the screw or barrel, avoid using high screw speeds (preferably below 30 RPM). Wait until material fills the screw grooves before increasing to the required speed to prevent scoring of the screw or barrel from excessive idle speeds.

Clamping Force and Machine Settings

• Because different materials, product sizes, and shapes require different clamping forces, adjust the clamping force to the minimum actually needed. This not only saves electricity but significantly extends machine service life.
• The machine's oil pump safety valve is factory-set; do not adjust it arbitrarily.
• Use molds with proper mounting surface flatness. Avoid using molds with poor parallelism or incorrect screws, which can damage the template and clamping mechanism.

Cooling System Management

• After the machine starts and cooling water temperature rises by 5-10 degrees Celsius, gradually open the cooler water inlet valve. Adjust water flow during operation to maintain oil temperature below 55 degrees Celsius.
• Important: Never rapidly open the water inlet valve when starting the cooler. A sudden surge of cooling water through the cooler can form a poorly conductive "super-cooled layer" on the tube surface, making subsequent cooling ineffective even with large water flow.

Lubrication Requirements

• Strictly follow lubrication operation requirements. Operating under oil-deficient conditions will severely wear machine components, especially the rear template and tie bar guide bushings, linear rolling guides, synchronous gearbox, and the front/rear gear racks of the mold opening/closing mechanism. Oil deficiency can cause seizure and render the machine inoperable.
• For the screw connections in heated plasticizing sections such as the barrel and screw, apply heat-resistant grease (red lead or molybdenum disulfide) to threaded parts during disassembly to prevent seizing.

End-of-Production Shutdown

• Close the hopper discharge gate plate. Using Manual operation mode, extrude all remaining material from the barrel and inject all material from the accumulator.
• Using Manual mode, position the closed mold in a free state.
• Cut off the heating power supply, shut down the oil pump motor, main power supply, and cooling water.
• Perform machine cleaning and maintenance.

Additional Critical Checks

• Learn the function of every switch on the control panel to avoid operational errors that could damage the machine.
• Electric heating rings expand during use and may become loose. Check regularly and tighten as needed.
• Ensure thermocouple probe tips maintain good contact with barrel temperature measurement holes. Check before startup and tighten if poor contact is found.