Injection Moulding Gap Analysis
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Injection Moulding Gap Analysis - Advanced
This assessment will give you an overview of your level of Advanced knowledge in Injection Moulding. You will receive an email with your result as soon as it is completed.
The assessment should take you 15-20 Minutes.
All results are strictly confidential.
Good Luck!
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Injection Moulding Overview - Advanced.
Please select the best possible answer in the below questions
It is dangerous to mould acetal in a machine which has been moulding:
Polyethylene
Polyester
PVC
All of the above
Which statement is typically true about processing with colourants?
Colourants typically increase the viscosity of the polymer
Lighter materials typically flow easier than darker materials
Adding more colourant will raise the peak injection pressure
All of the above are generally correct
Which is considered a specialised cooling method?
Straight baffle
Twisted baffle
Straight bubbler
Thermally conductive pin
All of the above are specialised cooling methods
Air poppet valves use a spring-loaded valve mounted in the...
Ejector plate
Core retainer plate
Core
Cavity
Placing too many vents on the injection mould...
Can cause flash to occur
Can cause burning to occur
Can cause surface air bubbles to occur
Can cause splay to occur
None of the above
During which portion of the injection moulding process should gate seal occur?
Injection
Packing
Hold
Cooling
Part ejection
Which defect is likely to result from an inconsistent check ring?
Short Shots
Sinks
Flash
All of the above are likely
B and C are likely
Which statement is true about processing polymers?
As the polymer flow rate decreases, the polymer chain orientation increases
As the shear rate increases, the polymer viscosity decreases
As the polymer temperature increases, polymer chain mobility decreases
All of the above are correct statements
None of the above are correct statements
When amorphous polymers cool slowly, which attribute develops?
Solid crystals
Crystalline structures
Some Semi-crystalline regions
All of the above can develop
None of the above are correct
Which change can decrease the possibility of polymer degradation?
Increase barrel residence time
Increase back pressure
Increase 1st stage injection speed
Increase Screw recovery delay time
None of the above decrease the possibility of polymer degradation
Which processing information would directly indicate an increase in polymer viscosity?
Increased 1st stage fill time
Increased 2st stage pressure at transfer
Decreased torque during screw recovery
Decreased Peak injection pressure during 1st stage
None of the above are correct
Heater bands are used to maintain a consistent...
Plastic temperature
Feed throat temperature
Barrel temperature
Screw temperature
All of the above are correct
Barrel residence time will increase if the...
Screw speed increases and cushion size decreases
Screw speed decreases and cushion size increases
Screw speed and cushion size increases
Screw speed and cushion size decreases
Which machine mode should be used to mould the air shot/ dry cycle under full processing conditions?
Manual
Automatic
Semi-automatic
Both A and B are acceptable
Both B and C are acceptable
Which is not 1 of the 4 plastic variables?
Plastic Temperature
Plastic Flow Rate
Plastic Pressure
Plastic Time
Plastic Cooling
Pressure is created by:
Excessive flow
Resistance to flow
Relief of flow
Diversion of flow
Which adjustment is likely to improve the appearance of flow lines on the moulded part?
Increasing screw speed
Increasing mould temperature
Increasing Back pressure
Increasing Injection Speed
All of the above are likely to improve the appearance of the flow lines
To develop a robust process, how large should the final cushion be?
Less than 2% of the overall shot size
About 5% of the overall shot size
About 10% of the overall shot size
About 15% of the overall shot size
About 20% of the overall shot size
During which stage of the process does the polymer in the mould encounter the highest pressure?
1st stage Injection
2nd Stage Pack
3rd Stage Hold
Screw Recovery
The lowest pressures within the mould are encountered...
Nearest the gate
At the centre of the mould cavity
At the end of fill
Depends on the mould construction
In a hydraulic moulding machine, a decrease in back pressure will...
Decrease the amount of hydraulic fluid exiting the injection cylinders during screw recovery
Decrease the rate of hydraulic flow from the injection cylinder during screw recovery
Increase the plastic pressure in front of the screw during screw recovery
Increase the amount of energy required during screw recovery
None of the above will occur
1st stage injection pressure is used to...
Fill, pack, and hold mould cavity
Fill and pack the mould cavity
Fill the mould cavity
Short shot the mould cavity
None of the above
Which machine controls affect the temperature of the melt in the barrel?
Injection Speed
Back Pressure
Barrel temperature
Screw Speed
All of the above will have an effect
B, C and D only
When monitoring for dimensional variations, the two most important variables to monitor are peak cavity pressure at the end of fill and...
1st stage fill time
Hold on pressure at transfer
Peak cavity pressure at the gate
Peak injection pressure
Injection forward pressure integral
Which process control parameter will have the greatest affect on the shear rate of the polymer during 1st stage?
Injection time
Injection pressure
Injection flow rate
Mould temperature
All have equal effect on the polymer shear rate
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