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Natural fibre products Quiz 7

Theme: Natural Fibre Products NFP Quiz 7 Natural fibre products Quiz 7

Natural fibre products Quiz 7

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Question 1 of 10

1. Question
1. What is the typical consistency of the stock flow entering the paper machine headbox?
- A) A) 0.2–1.0%
- B) 5–10%
- C) 10–15%
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Question 2 of 10

2. Question
2. Which of the following best describes the term “formation” in papermaking?
- A) The dilution of thick stock
- B) B) Small-scale local grammage variation in a formed web
- C) The process of creating a wet web
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Question 3 of 10

3. Question
3. What is the sediment concentration range for softwood fibres?
- A) 6–9 g/L
- B) 4–5 g/L
- C) C) 2–3 g/L
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Question 4 of 10

4. Question
4. The crowding factor (N) increases with fibre slenderness and indicates the degree of fibre contact in suspension.
- A) A) True
- B) False
- C) Only in high-concentration forming
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Question 5 of 10

5. Question
5. What is the main function of the headbox in a paper machine?
- A) Dry the paper web
- B) B) Distribute the mix evenly across the wire section
- C) Add fillers to the pulp
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Question 6 of 10

6. Question
6. Which type of headbox uses air pressure as a control parameter?
- A) Hydraulic headbox
- B) Multilayer headbox
- C) C) Aircushion headbox
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Question 7 of 10

7. Question
7. What is the effect of floc stretching in an accelerating nozzle flow?
- A) A) Flocs break into smaller units
- B) Flocs become denser
- C) Flocs form larger clusters
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Question 8 of 10

8. Question
8. Which type of radiation can be used to best quantify formation on-line?
- A) Optical transmission
- B) B) Beta radiography
- C) Laser interferometry
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Question 9 of 10

9. Question
9. What is the purpose of using separation vanes in multilayer headboxes?
- A) To mix additives into the pulp
- B) To increase fibre flocculation
- C) C) To maintain layer separation and reduce turbulence
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Question 10 of 10

10. Question
10. What is the typical grammage variability range for formation-scale variations?
- A) A) 0.1–20 mm
- B) 1–5 mm
- C) > 10 m
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This page has been updated 07.01.2026

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