Discussion
Consider the following statements about extrusion faults.
1. Laminations originate in the helical flow imposed by the auger.
2. De-airing reduces but does not always eliminate them.
3. Laminations are caused by firing the product too quickly.
Answer: C
The first two are correct. The third mistakes where the fault is created, since firing only reveals a weakness that the extruder had already built into the column. The kiln is where faults appear rather than where they are made.
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