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Q1— Section header —
1.5in the ANSWER BOOK.
1.1Large cylindrical tank that stores chips.
1.2Process during which par ticles separate because of its ability to float on a particular liquid
1.3Thick mixture of fibre and water
1.4mperature of the contents in a digester raised by circulating cooking liquor
1.55
Q2— Section header —
2.10\n the ANSWER BOOK.
2.1A Rosser head de barker is slower than a ring barker.
2.2Washing in the de inking process removes ink from paper that has small particles of ink on it.
2.3Defl aking is a process in which fibres are refined.
2.4The inactive cooking che mical in the composition of Kraft cooking liquor is sodium hydroxide.
2.5Mechanical pulping produces a higher yield than chemical pulping.
2.6A stainless steel digester is used in the NSSC pulping process.
2.7The brightening process starts before the extraction process.
2.8The acid s ulphite pulping process produces lower pulp strength than the Kraft pulping process.
2.9Spent liquor in the acid sulphite pulping process is called red liquor.
2.1010
Q3— Section header —
3.10\n the ANSWER BOOK. COLUMN A COLUMN B
3.10Lar ge machines used to remove logs Protects the shell of t he blow tank from being damaged Affects the quality of pulp Breaks up the flow of fibre
Q4— Section header —
4.1Name TWO methods to dispose of bark. (2\
4.2Explain how a drum debarker removes bark from logs. (4\
4.3List THREE ways to ensure that chip piles are managed effectively. (3\ [9] (6050383\9
Q5— Section header —
5.1Name the FOUR pieces of equipment used when making pulp from bagasse (4\
5.2Give TWO reasons why the pith and sludge exiting the dewatering press will still be very wet. (2\ [6]6
Q6— Section header —
6.1Explai n the working principle of a de flaker. (3\
6.2What is the purpose of the drop leg in a rotary vacuum washer? (1\
6.3Why are softwood trees used in mechanical pulping? (1\
6.4Give TWO reasons why burn marks appear during the grinding process. (2\
6.5Give ONE advantage of having a pit under the pulp stone (2\
6.6riefly explain the TMP process. (2\ [11]11
Q7— Section header —
7.1Explain the FOUR stages of the refining process. (4\
7.2Briefly explain each of the following functions associated with the Kraft pulping process:
7.2.1Steam packing
7.2.2Pre steaming
7.2.3
7.3Give TWO reasons why pulp leaving the Kraft digester will be discoloured (2\ [12] (6050383\12
Q8— Section header —
8.1Name the TWO pieces of equipment used in the NSSC pulping process. (2\
8.2What is the reason for blowing bagasse fibres into an atmospheric blow tank? (2\ [4]4
Q9— Section header —
9.1Give ONE advantage that soda pulping has over chemical pulping (1\
9.2Complete the follo wing table indicating poor soda pulping performance by writing only the answer next to the question number (9.2.1
9.2.4\in the ANSWER BOOK. INDICATOR REASON REMEDY/SOLUTION Large amounts of fibre bundles
9.2.4(4 1\ (4\
9.3Explain the purpose of calcium or magnesium when cooking wood chips during acid pulping (2\ [7]7
Q10— Section header —
10.1
10.2Give THREE disadvantages of tower B. (3\
10.3Explain what happens in tower A. (1\
10.411
Q11— Section header —
11.1
11.2ame TWO methods of lamination (2\ [7]7
Q12— Section header —
12.1Name THREE materials that make up a water based coating mixture. (3\
12.2Additives h elp pigments to mix with water. Lis t THREE other purposes of additives. (3\
12.38