What term is used for a mill that produces its own pulp as well as paper or board?
- Complete
- Integral
- Integrated
- Pulp mill
What operation might immediately follow chip screening?
- Digestion
- Storage
- Slashing
- Splitting
Which pulping process does not require logs to be debarked?
- Soda
- Sulphate
- Sulphite
- NSSC
The inlet chute of a chipper is set at what angle?
- 25-30 degrees
- 30-35 degrees
- 35-40 degrees
- 40-45 degrees
What two abrasive materials are typically used for the production of SGW pulp?
- SiC and Al2O3
- Granite and carbon
- Diamond and Al2O3
- Diamond and SiC
What four groove patterns are employed on grindstones?
- Chevron, diamond, spiral, thread
- Straight, chevron, spiral, thread
- Straight, diamond, spiral, chevron
- Straight, diamond, spiral, thread
Which is the most common pattern in a grindstone?
- Chevron
- Diamond
- Spiral
- Thread
What is a typical groove depth on a grindstone?
- 1.6mm
- 2.6mm
- 3.6mm
- 4.6mm
How often is stone-sharpening carried out?
- 50-150 hours
- 100-200 hours
- 150-250 hours
- 200-300 hours
Grindstones are typically operated at what temperature?
- 30-50C
- 90-120 C
- 130-150C
- 150-180C
A typical refiner plate has how many zones?
- 2
- 3
- 4
- 5
A typical refiner consistency is?
- 8%
- 16%
- 24%
- 32%
Why are temperatures above 140C detrimental to the production of TMP?
- This is the glass transition temp of lignin; it will coat the fibre with a glassy sheath
- This is the spontaneous combustion temperature of cellulose; it will cause a fire
- This is the glass transition temp of hemicellulose; it will coat the fibre with a glassy sheath
- The moisture in the fibre instantly converts to steam and blows the fibre apart
What is the typical level of chemical used in the CTMP process?
- 1-2%
- 2-3%
- 3-4%
- 4-5%
What is the typical level of chemical used in the CMP process?
- 0-4%
- 4-8%
- 8-12%
- 12-16%
Which of the variety of pulping processes gives the strongest sheet?
- Acid sulphite
- NSSC
- Soda
- Sulphate
In the sulphite process, what temperature are the chips heated to prior to cooking?
- 50 C
- 100C
- 150 C
- 200 C
In the sulphite process, what is the normal cooking temperature?
- 90-100
- 120-130
- 150-160
- 180-190
In the sulphite process, what is the normal cooking pressure?
- 2-3 Bar
- 3-4 Bar
- 4-5 Bar
- 5-6 Bar
In the sulphite process, the spent liquor is burnt at what temperature?
- 300 C
- 600 C
- 900 C
- 1200 C
From the sulphite process, the burnt spent liquor residue produces what two chemicals?
- MgO and SO2
- MgO2 and SO3
- NaOH and Na2S
- Na2O and NaS2
What two chemicals are used in the sulphate pulping process?
- MgO and SO2
- MgO2 and SO3
- NaOH and Na2S
- Na2O and NaS2
In the sulphate process, what is the normal cooking temperature range?
- 100-130 C
- 140-170 C
- 180-200 C
- 200-230 C
In the sulphate process, what is the normal cooking pressure?
- 2 Bar
- 2 Bar
- 6 Bar
- 8 Bar
What is Black liquor?
- The new unused cooking liquor
- The used cooking liquor
- The causticised liquor
- The excess cooking liquor
What is White liquor?
- The new unused cooking liquor
- The used cooking liquor
- The causticised liquor
- The excess cooking liquor
What is the next stage after the production of green liquor?
- Causticisation
- Cooking
- Dissolution
- Smelting
Select the correct four differences between sulphate and sulphite pulps. Sulphite pulps are.......
- Brighter, weaker, softer, faster wetting
- Brighter, stronger, harder, faster wetting
- Brighter, weaker, softer, faster wetting
- Brighter, stronger, softer, slower wetting
What type of materials is the soda process used for? Give two examples
- Straw and manila
- Hardwood and flax
- Cotton and wool
- Hemp and softwood
Semi chemical pulping gives what range of yield?
- 20-40%
- 40-60%
- 60-80%
- 80-100%
What chemicals are used in the NSSC process?
- Na2SO3/Na2CO3
- Na2SO4/Na2CO3
- Na2SO3/NaHCO3
- Na2SO4/NaHCO3
What application is NSSC pulp particularly useful for?
- Fluting
- Newsprint
- Printings and Writing
- Solid Bleached Boxboard