Discussion
A high molecular weight polymer passes through different zones from the hopper to the die in an extruder. Among the options given, identify the correct match between the zones and their key functions.
| Zones | Key functions | ||
|---|---|---|---|
| P | Metering zone | 1 | High shear forces for effective mixing |
| Q | Compression zone | 2 | Receives the charge or feed |
| R | Feed zone | 3 | Melts the charge or feed through heat conducted by the heating element |
| S | Working zone | 4 | The charge or feed acquires a constant flow rate imparted by the helical flight of the screw |
Answer: A
The correct match is P-4; Q-3; R-2; S-1.
- Feed zone (R): under the hopper, it receives the charge and conveys the solid pellets forward (2).
- Compression zone (Q): the channel depth decreases, compacting the material while heat from the barrel heaters and shear melts it (3).
- Metering zone (P): a shallow, constant-depth section that pumps the melt at a steady rate set by the screw flights, giving uniform output to the die (4).
- Working zone (S): in the paper's scheme, the section where high shear works and mixes the melt to make it uniform (1).
The other options swap these roles; for example, a feed zone cannot melt or mix the charge, because the polymer there is still solid pellets being conveyed.
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