The PRIMARY objectives of pressing are
- removal of water and smoothing of the sheet
- removal of water and caliper reduction
- removal of water and consolidation of the sheet
- caliper reduction and smoothing the sheet
The SECONDARY objectives of pressing are
- removal of water and smoothing of the sheet
- caliper reduction and smoothing the sheet
- removal of water and caliper reduction
- removal of water and consolidation of the sheet
Why does the shoe press blanket not touch the shoe?
- Because of an oil film
- Because it is in contact with a roll
- Because it contacts the paper
- Because it contacts the fabric
Which two types of press encourage the transverse movement of water through the press fabric?
- Vacuum and blind drilled
- Vacuum and double felted
- Vacuum and plain
- Shoe and blind drilled
Other that the press rolls, how many different types of roll does a press fabric touch?
- One
- Two
- Four
- Three
Why did the open draw between the forming fabric and the first press fabric evolve into a no-draw configuration?
- To reduce the machine length
- To reduce the number of breaks
- Because vacuum rolls were invented
- Because the first press is always double felted
Whch of the press configurations is in the correct order of their development?
- Twinver Press
3-nip no-draw press
3-nip press - 3-nip press
3-nip no-draw press
Twinver Press - 3-nip no-draw press
3-nip press
Twinver Press - 3-nip press
Twinver Press
3-nip no-draw press
The main advantage of the active camber roll is that you can........
- adjust the camber to match the press loading
- Increase the camber when the press load is decreased
- Correct for poor grammage profiles
- Speed up the machine
The area under the pressure-time curve is known as the ......
- Work curve
- Nip curve
- Nip pressure
- Nip impulse
The pressure profile in the shoe press is not symmetrical so......
- that higher pressures can be applied
- it can minimise sheet rewetting
- it can reduce the effect of crushing
- that the press cab be double felted
Modern press fabrics are made from
- multifilament yarns
- monofilament yarns
- batt fibres
- wool
The most important part of the press fabric is the
- Active void volume
- Void volume
- Batt fibres
- Mesh
How many types of shower could you find on a press fabric?
- Four
- Three
- Two
- One
What type of cleaning would you use to remove Kymine type wet strength resin from a press fabric
- Alkail
- Acid
- Solvent
- HP shower
How would you calculate active void volume?
- volume of fabric - (volume of fibre + volume of water)
- volume of fabric - (volume of fibre - volume of water)
- volume of fabric - volume of fibre + volume of water
- volume of fabric -
In Wahlstroms Theory of Pressing, in which zone does the water start to flow from the sheet into the fabric
- Two
- One
- Three
- Four
In Wahlstroms Theory of Pressing, in which zone does the water pressure in the fabric become negative
- First
- Second
- Fourth
- Third
In Wahlstroms Theory of Pressing, why does the water pressure in the fabric become negative
- because it is sucked into the paper by capillary action
- because the nip is opening
- gravity pushes it out of the fabric
- the fabric expands
In Wahlstroms Theory of Pressing, how many zones are there?
- Four
- Three
- Two
- One
What are the two limitations to pressing?
- Pressure and flow
- Pressure and speed
- Flow and speed
- Speed and drainage
What are the three functions of the press fabric?
- Carry the sheet
Aid dewatering
Prevent sheet shrinkage - Carry the sheet
Reduce dewatering
Prevent sheet shrinkage - Carry the sheet
Aid dewatering
Prevent sheet compaction - Prevent sheet compaction
Aid dewatering
Prevent sheet shrinkage