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Natural fibre products Quiz 18

Theme: Natural Fibre Products NFP Quiz 18 Natural fibre products Quiz 18

Natural fibre products Quiz 18

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Question 1 of 10

1. Question
1. What is the main reason microorganisms are present in every paper and board machine?
- A) The machines are open aqueous processes receiving contaminants from fresh water, air, and non-sterile raw materials
- B) They are intentionally added during the process
- C) They are necessary for the production of paper
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Question 2 of 10

2. Question
2. What is the primary target for biocide use in many paper machines?
- A) To add color to the paper
- B) To increase the weight of the paper
- C) To prevent machine breaks caused by detaching slimes
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Question 3 of 10

3. Question
3. What is the main disadvantage of using high doses of active chlorine-containing biocides?
- A) They can lead to increased corrosion of the board machine
- B) They are very expensive
- C) They are ineffective against microorganisms
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Question 4 of 10

4. Question
4. What is the main purpose of internal sizing in papermaking?
- A) To add color to the paper
- B) To increase the weight of the paper
- C) To make the fibrous material more water repellant (hydrophobic)
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Question 5 of 10

5. Question
5. What are the most common internal sizing agents used in papermaking?
- A) Rosin, AKD, ASA
- B) Plastic, metal, glass
- C) Rubber, leather, fabric
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Question 6 of 10

6. Question
6. What is the main advantage of using AKD as a sizing agent?
- A) It is the cheapest sizing agent available
- B) It is transparent
- C) It gives hard sizing and resistance against lactic acid
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Question 7 of 10

7. Question
7. What is the main purpose of using ASA as a sizing agent?
- A) To add color to the paper
- B) To provide fast curing and high sizing efficiency
- C) To increase the weight of the paper
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Question 8 of 10

8. Question
8. What is the typical pH range for using rosin sizes?
- A) 1 to 3
- B) 4 to 7.5
- C) 8 to 10
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Question 9 of 10

9. Question
9. What is the main purpose of using aluminium compounds in ASA sizing?
- A) To add color to the paper
- B) To prevent the formation of tacky ASA precipitates and increase retention and dewatering
- C) To increase the weight of the paper
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Question 10 of 10

10. Question
10. What is the main method for determining sizing efficiency in paper and board products?
- A) Measuring the weight of the paper
- B) Measuring the amount of water absorbed in a specific time (Cobb test)
- C) Measuring the color of the paper
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This page has been updated 07.01.2026

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