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Natural fibre products Quiz 9

Theme: Natural Fibre Products NFP Quiz 9 Natural fibre products Quiz 9

Natural fibre products Quiz 9

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Question 1 of 10

1. Question
1. What is the primary goal of wet pressing in papermaking?
- A) To apply coatings
- B) To reduce machine speed
- C) To expel water and increase web dry content
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Question 2 of 10

2. Question
2. Which factor contributes to low manufacturing costs in wet pressing?
- A) Use of single-felted nips
- B) Increased rewetting
- C) High web solids content after pressing
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Question 3 of 10

3. Question
3. What is the main driving force for water removal in the press nip according to Börje Wahlström?
- A) Surface tension
- B) Fibre bonding
- C) Hydraulic pressure
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Question 4 of 10

4. Question
4. Which of the following is a controversial issue in wet pressing?
- A) Press impulse
- B) Rewetting
- C) Sheet grammage
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Question 5 of 10

5. Question
5. What does Darcy’s law help model in wet pressing?
- A) Moisture ratio prediction
- B) Fibre stiffness
- C) Surface gloss
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Question 6 of 10

6. Question
6. Which type of nip is dominated by hydraulic pressure and benefits from increased pressing time?
- A) Flow-controlled nip
- B) Pressure-controlled nip
- C) Suction nip
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Question 7 of 10

7. Question
7. How does increasing temperature affect wet pressing performance?
- A) Increases water viscosity
- B) Decreases water surface tension
- C) Increases spring-back
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Question 8 of 10

8. Question
8. What is the effect of previously dried fibre compared to never-dried fibre in wet pressing?
- A) Easier water removal
- B) Higher water absorption
- C) Increased rewetting
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Question 9 of 10

9. Question
9. Which sheet property affects both hydraulic pressure and rewetting?
- A) Compressibility
- B) Permeability
- C) Spring back
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Question 10 of 10

10. Question
10. What are the key quality characteristics for most board grades influenced by wet pressing?
- A) Moisture ratio and grammage
- B) Bulk, stiffness, ply bond, and surface finish
- C) Gloss and opacity
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This page has been updated 07.01.2026

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