Plasticizing System Commissioning For Extrusion Blowing Machine

November 23, 2021

The heater of the plasticizing system must be fastened evenly, and the heater and the heated surface must be evenly and closely fitted. For the mica heater, gently tap with a rubber hammer while fastening to ensure a tight fit, which is conducive to uniform heating and prolong the service life of the heater.

The thermocouple probe must have sufficient spring preload to ensure accurate temperature measurement.

Generally, the compression bolt of the die head of the storage cylinder should not be fully tightened, but can be pressed gently to allow room for the thermal expansion and cold contraction of the barrel; The axis of the barrel shall be kept straight without bending.

Before heating, the barrel cooling water and die head cooling water must be turned on to prevent agglomeration and blockage in the feeding section of the barrel, aging and oil leakage of the oil cylinder seals on the gearbox and die head.

A magnetic frame shall be placed in the hopper to prevent iron filings and sundries from entering the screw, causing damage to the screw and die parts or blockage of die flow channel.

When the cooler is started, it is usually recommended to reduce the extrusion speed and gradually increase the speed after the tube blank is normally extruded from the die.

Before the pipe blank is normally extruded from the die, the personnel shall not stand in front of the die head and under the die; During the first 3 times of material injection of the storage cylinder machine, the personnel should stay away from the lower part of the die, and the manual material injection pressure should not be too large (generally not more than 5MPa).

The automatic injection pressure of the storage cylinder machine should not be too large. The actual time of automatic injection is usually greater than 5 seconds. Too fast speed is easy to lead to inaccurate wall thickness tracking and melt fracture.

For machines equipped with wall thickness control system, the wall thickness controller must be started and operated manually once, and then the extrusion shall be started to prevent damage to parts caused by complete closure of die opening.

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