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Extrusion Blow Moulding Gap Analysis Entry Level
This assessment will give you an overview of you level of knowledge in Extrusion Blow Moulding. You will receive an email with your result as soon as it is completed.
The assessment should take you 10-15 Minutes.
Good Luck!
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Extrusion Blow Moulding overview - Entry Level
Please select the best possible answer in the below questions
In the closed mould, when forming a product, heat is transferred from the plastic to the mould, to...
Venting Duct
Circulating Coolant
Reciculation Chamber
Blow Pins
Making sure that plant safety regulations and operating rules are followed is the responsibility of
Blow moulding plant management
The Equipment manufacturers
All Blow Moulding plant personnel
Goverment regulatory agencies
When working on a blow moulding machine during maintenance or set up, you must make sure that the power sources are
On their lowest settings
Locked out
Turned off
On
The first step of prestart is to determine that you are using the right plastic. The next step is to
Weigh the material
Add pigment
Check the plastic for contamination
Measure temperature of the plastic
Plastic Shrinkage is due to
The part being released from the mould
Cooling polymer molecules moving closer together
An incompletely expanded parison
All of the above
The major source of heat to the plastic is the transition/compression zone is from the...
Barrel heaters
Thermregulator
Friction caused by the screw
Shape of the pellets
What type of products are usually made in extrusion blow moulding?
Oversized
Inflatable
Hollow
Dense
The feed section of the screw has the greatest
Pressure
Speed
Heat Capacity
Flight Depth
Material in the hopper travels through the ___________ and falls onto the rotating screw
Barrel
Heater
Zoning area
Feedthroat
From the screen pack and breaker plate, the plastic flows to the...
Extrusion filter
Diehead
Die gap
Barrel head
Parison
What forces the parison against the mould cavity walls?
Venting
Heat
Air pressure
The diehead
Cooling
In intermittent extrusion blow moulding, the plastic melt collects in the...
Ram
Diehead
Accumulator
Reservoir
Vaccuum chamber
The accumulator in a reciprocating screw extruder is located...
In the area next to the machine
In the diehead
In the barrel of the extruder
In the mould cavity
The parison is sealed off where there is excess plastic by:
The guidepins
The pin inserts
Flash pockets
Pinches/Cuting edges
All plastic that can be remelted and reused are:
Mono-plastics
Polymers
Thermoplastics
Thermosets
Elastomers
The main reason to use the Stretch Blow Moulding process is to:
Make a thinner parison
Reduce Parison Sag
Increase molecular orientation in the hoop direction
Reduce the molecular orientation in the blown parts
Produce bi-axially orientated molecular structures in the blown parts
Bolts, clamps and heater bands ont he extruder and the diehead tend to loosen over a period of time mainly due to:
Wear on the metal components
Opening and closing of the mould
Plastic pressure
Plastic Leakage
Thermal expansion and contraction of the metal
When plastic flows around an obstruction, such as the mandrel or spiderlegs, and then rejoins, the result is
Weldline
Weakened areas
Knit line
All of the above
During the machine warm up phase, as soon as the temperature controllers for the extruder barrel and diehead reach their operating set point, you should
Immediately start screw rotation
Turn ont he moulding cooling system
Continue to let the extruder and die head heat up
Begin Blow Moulding
Turn on the hopper throat cooling water
If the die gap is not uniform around the circumference as the parison is extruded, the parison will bend
90 degrees from the thin side
Towards the thick side
The parison will not bend
Towards the thin side
When first starting extruder screw rotation, what screw rotation speed would you use whilst checking for possible problems?
40 RPM
20 RPM
60 RPM
5 RPM
100 RPM
If the mould is to remain in the machine during shut down, it should be
Kept closed with full clamp force
Left open
Closed lightly
Any of the above
The objective during warm-up is to
Test the machine controls
Produce the correct melt viscosity
Bring the extruder die head and plastic to the required operating temperature
All of the above
The factor that most affects viscosity is the
Accumulator ram velocity
The die head gap adjustment
The melt pressure
The melt temperature
The plastic temperature in the pinch-off/cutting edge areas must be high enough to promote molecular ______________.
Relaxation
Entanglement
Orientation
Flow
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