die manufacturer for pvc pp pet eva sheet

problem

reason

solve problem

1. Uneven thickness of sheet

1.the temperature is not settled reasonability

(1)The temperature affects the melted plastic’s flow form in the mould runner, and also affect the plastic product’s thickness,

The workers should cheek whether the heating device is damaged or not, and every section’s temperature is reasonable or not.

Please tiny turn down or turn up the temperature according to the production status, in order to stabilize the mould temperature.

2.wire connection mistake or temperature measuring device damagement

(2)Please cheek the actual temperature is coincidental with the initialized temperature or not, the temperature measuring device (thermocouple) should stick into the bottom, and be connected to the mould by the screw. Any of the heating devices that is not working well should be changed.

Pressure fluctuations

(3)Please check Gear Pump,screen changer and feedblock.and adjust die lip after extrusion stable

Non-uniform of sheet’s horizontal thickness

(4)Please adjust die lip by mirco adjustable screw

Dusty in lip

(5)Please clean the die lip

Any problem of runner caused by die’s deformation

(6)Please give it to manufacture.

Sheet’s surface defect

There is too much impurities in the melt.

(1)to re-clean-up mould and connectors

too much impurities in the runner

(2)due to equipment long-term operation, the melt or impurities will accumulate in the runner , affect the melt flow as well as product quality, runner should be cleaned up periodically, In normal operation we suggest clean up the runner every month thus prolonging the life of mould

runner or mould lip parts are scratch

(3) If can’t fix it by yourself, please contact the manufacturer

the runner chromium plating layer off.

(4)after the long-term operation or use corrosive materials may cause chromium plating layer off

leakage

the pressure of entrance side over the machine limit.

(1)    Check extruder settings, Have damaged or stress test error pressure sensor need to be replaced or make recalibration

the junction part screws didn’t tighten

(2)    heating it and re-tighten the screws, Should use uniform torque

the surface of mounting surface is irregularity.

(3)    to re-clean the surface, if it is necessary, planish with the millstone

Assembly is not in place or sealer damage.

(4)    Check the installation location of parts, tighten the screws evenly, or replace a new sealer