Quiz 1 - Extrusion and Injection Moulding

Raw material - ? - ? - cooling - cutting - ? - ?

• mixing, extrudate, extrude, packing

• blend, extrude, extrudate, packing

• mixing, extrude, extrudate, packing

• blend, extrude, extrudate, packing

What is the function of waterbath?

• heat rise

• shape the extrudate

• alignment of the extrudate

• homogenised the raw material

Flow rate of the plastic is controlled by?

• rotation of the screw

• material used in the formulation

• types of the screw

• diameter of the die head

What are the 3 threads of the screw?

• side thread, middle thread, end thread

• longer thread, shorter thread, lower thread

• higher thread, upper thread, lower thread

• deeper thread, shallower thread, shallowest thread

Select the sequence of the injection molding process

• RM - viscous fluid - injected - product

• RM - elastic fluid - ejected - product

• RM - viscous fluid - ejected - product

• RM - elastic fluid - injected - product

The filling time of the mold filled in injection molding is effected by?

• part complexity, volume of the plastic injected to the mold

• temperature of the material being injected, material used

• size of the part, part removal

• material used, size of the part

Functions of injection molding include?

• heating the solid material, deliver the viscous material to the runner, as the cooling agent to the molding, to remoc=ve the part form the mold

• cast the part, cooling the part, proper matting at the two halves, disengage the folded part

• heating the RM to become viscous, solidify the part, eject the part, act as pressure controller

• control the thickness of the part, maintain the injected temperature, to determine the part shape, act was a clamping mechanism

Compared to dispersive mixing, the distributive mixing is a process of the components are uniformly distributed

• true

• false

The functions of the compounding extruder are:

• melting, metering, dispersing, homogenising

• feeeding, devolatizing, dispersing, distributing

• feeding, melting, mixing, venting

• disengaging, formating, melting, cooling

Where is high shear region happened in the screw?

• channel, overflight, local pools, apex mixing

• channel, overflight, apex mixing, intermesh interaction

• tip mixing, local pools, intermeshing interaction, apex mixing

• channel, tip mixing, apex mixing, local pools