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WorksheetsInjection Moulding Machine
Total questions: 20
Worksheet time: 10mins
Once the molding cycle is about to begin, the plastic pellets enter the screw and barrel assembly through the:
Runner
Feed throat
Hopper
Nozzle
Check valves are used on all machines to provide a way to:
Connect the molding machine to the mold
Stop the material from flowing over the screw during injection
Positively shut off the material to prevent drooling
None of the above
What percentage of the heat needed to melt the plastic comes from the shearing action of the screw?
10-29%
30-49%
50-69%
70-90%
Molding a part which has an insert requires the machine to be in what mode?
Semi-automatic
Automatic
Set-up
Manual
During injection, the plastic material flows from the sprue to the runner, and finally, to the cavity by what
passageway?
Barrel
Gate
Nozzle
Feed throat
The function of the reciprocating screw is to:
Plasticize or melt the plastic material.
Convey the material to the front of the screw.
Force the melted material into the mold.
All of the above
The portion of the screw where most of the shearing takes place is the:
Feed Zone
Transition or Compression Zone
Metering Zone
None of the above
A hopper dryer is used to:
Lift the material from storage boxes
Funnel the plastic into the barrel assembly
Reduce the moisture content of the material
All of the above
During machine shut-down, completely purge the barrel and:
Coat the mold with a mold saver
Turn off the hydraulic pump and barrel heaters
Leave the screw in the forward position
All of the above
The nozzle is used to:
Prevent the material from drooling
Connect the machine to the mold
Control the temperature of the melt
None of the above
Material is conveyed along the screw through the (in order):
Feed, metering, transition zones
Metering, transition, feed zones
Transition, feed, metering zones
Feed, transition, metering zones
The cavity of the mold defines the inside details of the part.
True
False
During injection, the screw rotation stops and the screw acts like a ram.
True
False
A reciprocating screw rotates counterclockwise while moving backwards and forward.
True
False
The fixed platen moves left to right by the clamp cylinder piston.
True
False
The manual mode of operation enables the machine to make one complete cycle.
True
False
To prevent bridging in the feed throat area, a cool water jacket is used to reduce the temperature.
True
False
Moisture has no effect on processing of a plastic resin.
True
False
70-90% of the heat needed to melt the material comes from the shearing action of the screw.
True
False
Once the mold opens and the parts are ejected, the machine is ready to cycle again.
True
False
