PRESS FELT DESIGN AND CONSTRUCTION
Quiz
There are 16 questions in this quiz. Complete it at your leasure and mail me with your score. Good Luck!
What are the major components of a modern day press felt?
- Bat fibre on Batt base
- Batt fibre and a woven base
- Bat fibre on bass
- Base fibre on a batt mesh
What process is used to fix the felt components together?
- Needling
- shelving
- sewing
- pinning
What fibre was the main component of the first generation of new felts?
- Nylon
- Cotton
- Wool
- Polyamide
What was the first development that led to improved stability and wear resistance?
- Multifilament cotton
- Multifilament rayon
- Better control of nip pressures
- Synthetic monofilament yarns.
What was this 2nd generation of new felts called?
- Batt on mesh
- Batt on base
- Bat on mesh
- Bat on filament
What major development occurred in the 1980’s?
- Seemless felts
- Synthetic fibres
- Triple layer fabrics
- Double layer fabrics
What does the void volume of a press felt determine?
- Water carrying capacity
- Crushability
- Resiliance
- Felt caliper
The weave structure of a felt is selected to fit three major requirements. What are they?
- Void volume, weight and smoothness
- Compression resistance, surface characteristics and smoothness
- Surface characteristics, smoothness and runnability
- Void volume, compression resistance, and surface criteria
Which weave structure has the most ‘knuckly’ top surface?
- Plain weave
- Double weave
- Sateen weave
- Triple weave
Which type of fabric had two layers of plied monofilament yarns in the machine direction as well as plied monofilament yarns in the cross direction?
- 2nd generation of double layer fabrics
- 1st generation of double layer fabrics
- Triple layer fabrics
- Singe layer fabrics
What is the main type of fibre used for the batt component?
- Wool
- Nylon
- Polyester
- Polyamide
What unit is used to measure the coarseness of a fibre?
- Decibel
- Fibretex
- Decitex
- Deckle
What does LOF stand for?
- Length of Fibre
- Light or Fluffy
- Longness of Fibre
- Length Oriented Fibres
Why are felts washed before delivery to the mill?
- To pre-fill the voids with water
- To remove the loose fibre and other debris
- To remove process lubricants
- To remove insects entrained in the process
What is resilience?
- Thickness recovery after the nip
- The tensile strength of the felt
- The expected lifespan of the felt
- The length to weight ratio of the fabric
How is the ‘hairiness’ removed from a felt?
- It is shaved
- It is singed
- It is dissolved out with strong acid
- It is dissolved out with strong alkali