REFINING

What is the typical angle of a wide angle refiner?
1. 90 degrees
2. 30 degrees
3. 60 degrees
4. 45 degrees
What three actions are carried out by a refiner?
1. Cutting, fibrillating and stretching fibres
2. Cutting, delaminating and externally fibrillating fibres
3. Stretching, internally fibrillating, and externally fibrillating fibres
4. Twisting, delaminating and shortening fibres
Which type of refiner is said to be best for cutting fibres?
1. A narrow angle refiner
2. A wide angle refiner
3. A double disc refiner
4. A single disc refiner
The space between the bars of a refiner is called the
1. Valley
2. Total Open Area
3. Instep
4. Pathway
How is the Nett Refining Power calculated?
1. gross power/no-load power
2. No-load power/gross power
3. No-load power - gross power
4. Gross power - no-load power
What is the specific edge load?
1. Net refining power x cutting length
2. Net refining power / cutting length
3. cutting length / Net refining power
4. cutting length + Net refining power
In which type of water will fibres refine fastest?
1. hard water above pH 7
2. hard water below pH 7
3. soft water below pH 7
4. soft water above pH 7
Which of the fibres below will swell most quickly during refining?
1. A fibre from the sulphite process
2. A fibre from the NSSC process
3. A fibre from the Groundwood process
4. A fibre from the sulphate process
Which one of the following chemical pulp fibres would respond best to refining?
1. Birch
2. Beech
3. Aspen
4. Pine
If refining is increased, which three properties will go down?
1. Tensile, opacity, smoothness
2. Caliper, roughness, opacity
3. Density, roughness, opacity
4. Tensile, smoothness, density

REFINING

Quiz