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unpleasant sight
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Possible Causes
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Approach
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Finished product variant
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Cooling time is too short, the finished product is not cooled enough
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Extend cooling time
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Open mold speed is too fast, strong pull variant
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Slow down mold opening speed
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Finished product structure is defective
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Modify the mold
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The mold temperature is too high and the finished product is not cooled.
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Reduce the mold temperature
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Finished product is easy to break
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Material temperature is too low or mold temperature is too low
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Increase barrel temperature and mold temperature
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Improper drafting or improper ejection
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Modify the mold
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The gate is too small
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Modify the mold
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Insufficient draft angle
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Modify the mold
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The finished product has a grain after the mold is released.
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The rate of fire is too fast, and the air in the cavity cannot be instantaneously discharged.
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Reduce the rate of fire, so that the air in the cavity is smoothly discharged
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Raw material contains water
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Baking material
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The molding temperature is too high, and the degranulation is decomposed by high temperature.
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Reduce molding temperature
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Air in the barrel
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Reduce the temperature in the back of the tube and increase the pressure
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Finished product with burrs
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Excessive pressure, the parting force is greater than the clamping force, and the mold is forced to open.
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Reduce the pressure, fly the mold, increase the clamping force
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Injection pressure and overpressure
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Reduce the pressure and pressure
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The shot is too fast, the material temperature is high
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Reduce the rate of fire and material temperature
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Mold vent clogging
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Cleaning the mold
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Insufficient filling of products
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Insufficient pressure, slow rate of fire or debris in the die
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Increase injection pressure, increase firing rate and clean the die nozzle
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The molding temperature is too low and the gate flow path is too small
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Increase molding temperature and modify flow path
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The air in the cavity cannot be completely discharged
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Add or enlarge vents
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Shooting time is too short, insufficient shot
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Extend the injection time and increase the injection volume
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Products have a bonding line
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Insufficient injection pressure, too fast, the gate and runner are too small
Another: the nozzle temperature is low, the molding cycle is long, the color masterbatch titanium dioxide is too much, and the color masterbatch is not well dispersed.
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Improve injection pressure, rate of fire, and modify gate flow path
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Molding temperature and mold temperature are too low
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Increase molding temperature and mold temperature, increase back pressure or accelerate screw speed
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Poor exhaust at the junction or no overflow tank (cold well)
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Increase the vent hole or increase the overflow pool at the junction
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Use too much release agent
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Reduce the amount of release agent used
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Poor gloss of the product
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The rate of fire is too slow, the injection pressure is too low, and the mold temperature is low.
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Increase injection pressure, rate of fire, and mold temperature
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Moisture or grease contamination in the cavity
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Wipe clean
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Poor surface grinding or too small gates and runners
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Modify the mold
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Insufficient injection volume or moisture in raw materials
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Increase jet fire rate, extend injection time and baking material
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Flow on the surface of the product
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The injection pressure is too high or too low, the rate of fire is too fast or too slow
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Adjust the appropriate injection pressure or rate of fire
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The holding time is too short or the gate is too small
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Increase the holding time or change the gate
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Mold temperature and gate temperature are too low
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Improve mold and gate temperature
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Poor material melting
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Increase temperature, back pressure or speed up the screw
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Extrusion finished surface rough
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Low molding temperature
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Increase temperature, back pressure and screw speed
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Mode temperature is too low
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Increase mold temperature
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The surface of the product is blocky
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The tube is not cleaned or has debris
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Reclean the tube
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Additives such as color masterbatch or carrier are not required
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Find the corresponding color masterbatch
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After the product is molded, it will be swollen.
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The die temperature is too low, or the screw speed is too fast
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Increase die temperature and reduce screw speed
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Limit too fast
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Adjusting the limiter
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Produces a large amount of gas during extrusion
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Overall temperature is too high
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Reduce the temperature
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There is debris in the material tube
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Cleaning the tube
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The product has shrinkage
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Raw materials contain water
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Baking material
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The melt temperature is too high and the screw speed is too fast
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Reduce temperature and reduce screw speed
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