Extrusion

Extrusion is a......

• Batch process

• Continuous process

Tick the following products formed through extrusion

• Pipes

• Profiles

• Detergent bottles

• Car head light lenses

Name the parts of extruder. Write your answer as A:name of the part, B: name of the part.....

ABC Sdn. Bhd. is collecting single used polyethylene films and wants to remelted and extrude it into pellets to be sold to compounders. What type of machine they can can use?

• Single screw extruder

• Twin screw extruder

• Injection moulding

XYZ Sdn Bhd wants to produce wood plastic composite with polypropylene and wood fibre for swimming pool floor decking. What machine they can use.

• Single screw extruder

• Twin screw extruder

• Injection moulding

Choose the correct statements.

• Single screw extruder has good self cleaning ability

• Less energy is consumed in twin screw extruder operation

• Feeding of powder polymers are easier in single screw extruder

• Twin screw extruder is more suitable for PVC

SSS Sdn Bhd wan compound polystyrene with 40 wt% silica filler, 10 wt% plasticizer, colour pigments and 20 wt% impact modifiers. They decided to use twin screw extruder. Which of the following type of twin screw extruder they can use?

• Co-rotating twin screw extruder

• Counter rotating twin screw extruder

Select the function of screen pack in extruder.

• Filter the un-gelled material from entering die

• Increase the flow of polymer melt into the die

• Improve mixing of melt before entering die

• Increase the temperature of the melt before entering the die

Which type of screw is used for compounding of Nylon with calcium carbonate filler?

• Basic Metering Screw

• Maddock Metering Screw

• Two Stage Venting Screw

Which of the following statements are TRUE?

• The deepest channel depth is in the feed zone

• The channel depth is narrowing in the metering zone

• The channel depth is narrowing in the compression zone

• The channel depth is 0.5 of root diameter