What was the typical water consumption of the first tunnel washers in the 1960s?
- 4-8 ltr/kg
- 14-19 ltr/kg
- 30-36 ltr/kg
What is the typical water consumption of a modern tunnel washer in 2007?
- 4-8 ltr/kg
- 14-19 ltr/kg
- 30-36 ltr/kg
How are batches transported in a tunnel washer from one compartment to the next?
- By a mechanical device
- By a pneumatical transport
- By a 360ø rotation of the inner drum
Which water is usually used for flushing the batch into the first compartment?
- Recovery water from the pre-wash
- Recovery water from the main wash
- Recovery water from the extraction
What are typical linen to water ratios in tunnel washers?
- 1-3 ltr/kg
- 4-6 ltr/kg
- 7-9 ltr/kg
Where is the main part of fresh water usually added into the tunnel washer?
- In the main wash
- In the rinse section
- In recovery tanks
How are deviations in the water management normally buffered in practice?
- In the piping
- In the wash compartments
- By means of recovery tanks
What is the main characteristic of standing baths?
- Strict bath separation
- Fixed overflow in the main wash
- Chemical dosing in the middle of the main wash zone
What is the main characteristic of counterflow washing?
- Constant detergent concentration in the main wash
- Water flow in opposite direction of linen flow
- Bath exchange at the end of the main wash
Which of the following sentences is wrong?
- Straight drum walls allow free linen movement
- Straight drum walls allow faster bath exchanges
- Straight drum walls increase the danger of blockages
What is the main characteristic of oscillating washing action?
- Permanent fold-over caused by beaters
- Permanent 360ø wash action
- Mechanical action with less friction on the textile surface
What is the main characteristic of rotating washing action?
- High friction, compression and flow-through
- Less flow-through and compression, more friction
- Less friction, more compression and flow-through
Which of the following statements is wrong?
- Rotating washing has advantages for typical stains from workwear and from table linen
- Rotating washing is more gentle to the textile surface
- Rotating washing causes higher fibre damages
Which design features have a direct influence on the mechanical action of the wash process?
- Loading and unloading chute
- Drum diameter and volume
- Drum insulation and steam supply
How can soiling of the rinse zone be avoided without additional water consumption?
- Bath exchange before transfer from the main wash to the rinse section
- Bath exchange after transfer from the main wash to the rinse section
- "Transfer from the main wash to the rinse section without free water (""DryTransfer"")"
What is a disadvantage of counterflow through overflow boxes?
- Rinse flow pulsing along the cycle time
- Rinse flow bypass through the outer drum
- Forced rinse flow guidance through the inner drum
Which way of rinsing helps reducing empty compartments for colour changes?
- Bath exchange rinsing
- Constant counterflow rinsing
- Pulsing counterflow rinsing
What is a precondition for bath exchange rinsing?
- Recovery tanks for rinse water
- Short drain and filling times
- Cool down before rinsing
Which impact of warm rinsing is false?
- Better rinse effect through swelling of fibres
- Less soiling of the rinse recovery tank
- Better water extration leading to rower residual moisture values
Of which components does the wash process consist according to Sinner's circle?
- Mechanics, temperature, time, chemistry
- Water, chemistry, steam, linen
- Temperature, water, wash movement, chemistry