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Natural fibre products Quiz 17

Theme: Natural Fibre Products NFP Quiz 17 Natural fibre products Quiz 17

Natural fibre products Quiz 17

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Question 1 of 10

1. Question
1. What is the term “retention” in papermaking used to describe?
- A) The amount of water retained in the paper
- B) The amount of chemicals retained in the paper
- C) How much of the suspended solid particles in furnish coming to headbox is leaving the paper machine wire as a web
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Question 2 of 10

2. Question
2. What are the two main types of retention in papermaking?
- A) Mechanical retention and thermal retention
- B) Chemical retention and biological retention
- C) Mechanical retention and chemical retention
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Question 3 of 10

3. Question
3. What is the main purpose of retention chemicals in papermaking?
- A) To improve machine runnability by ensuring efficient retention of fibres and fillers
- B) To add color to the paper
- C) To increase the weight of the paper
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Question 4 of 10

4. Question
4. What is the main mechanism of bridging flocculation?
- A) Using low molecular weight polymers
- B) Using high charge density polymers to form flat patches on the particle surface
- C) Using very high molecular weight polymers to form a three-dimensional structure by adsorbing onto several particles at the same time
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Question 5 of 10

5. Question
5. What is the main purpose of patching flocculation?
- A) To increase the weight of the paper
- B) To form cationic charge enriched patches on the particle surface that attract anionic parts of other particles
- C) To add color to the paper
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Question 6 of 10

6. Question
6. What is the main advantage of using cationic polyacrylamides (CPAM) as retention polymers?
- A) They are the cheapest retention polymers available
- B) They can form flocs by bridging and are the most efficient retention polymers
- C) They are transparent
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Question 7 of 10

7. Question
7. What is the main purpose of using microparticles in retention systems?
- A) To add color to the paper
- B) To improve the retention further at a neutral pH range or above
- C) To increase the weight of the paper
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Question 8 of 10

8. Question
8. What is the main factor influencing the grammage-range and production speed in paper machines?
- A) Available steam pressure
- B) Color of the paper
- C) Type of ink used
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Question 9 of 10

9. Question
9. What is the main purpose of adding a thickener to a coating formulation?
- A) To decrease coating weight
- B) To modify the rheology and increase the water retention of the coating colour
- C) To add color to the coating
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Question 10 of 10

10. Question
10. What is the main effect of water in a coating formulation?
- A) It makes the coating colour easier to mix and apply
- B) It increases coat weight
- C) It makes the coating bulkier
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This page has been updated 07.01.2026

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