Discussion
Arrange the sections of a Fourdrinier paper machine in order.
1. press section removing more water mechanically
2. headbox delivering the stock
3. dryer section evaporating the rest
4. wire section where the sheet forms and drains
Answer: A
Correct answer: 2 - 4 - 1 - 3
The stock arrives at about one per cent consistency and water is removed in order of increasing cost. The headbox spreads it evenly across the width, the wire drains most of the water by gravity and suction, the presses squeeze out more mechanically, and only the last few per cent is evaporated in the dryers. Evaporation is by far the most expensive route, which is why so much effort goes into the sections before it.
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