Which two walls of a fibre are most alike?
- P and S1
- S2 and S3
- S1 and S3
- S1 and S2
What is the fibril orientation in the S1 wall?
- parallel to the fibre axis
- Alternate left hand then right hand spiral
- Spiral - all in the same direction
- Random
Which of the following will be the longest fibre?
- Manilla
- Cotton
- Pine
- Sitka Spruce
What do we call the hole through the middle of a fibre?
- Lumen
- Middle lamella
- Pore
- Tracheid
What is the fibre coarseness independent of?
- Fibre diameter
- Fibre width
- Wall thickness
- Fibre length
Which of the following statements correctly completes the following sentance. The extent of bonding in a sheet is a frunction of
- Total length x number of crossovers
- Number of crossovers x area of crossover
- Total length x area of crossovers
- Number of fibres x number of crossovers
What happens to the crystallinity index of a fibre after drying?
- It will decrease
- Nothing
- It depends on the drying temperature
- It will increase
How many walls does a fibre have?
- 4
- 3
- 6
- 5
In which type of fibre would you find pits?
- Beech
- Cotton
- Birch
- Pine
In which type of fibre would you find vessels?
- Scots pine
- White birch
- Egyptian cotton
- Sitka spruce