Which kind of soilings do you know?
- "easily removable": dust, earth, "hard removable": oils, fats, small pigments, protein-containing soil, and "soil to be removed by bleach"
- soil to be remobed by washing, soil to be removed by disinfection, soil to be romoved by dry-cleaning, soil to be removed by wet-cleaning
- physically removable, chemically removable, biological removable
Different kinds of bathflow are:
- standing bath, bath exchange
- current flow, counterflow
- current flow, counterflow, standing bath, bath exchange
Which one is the principle of bathflow control?
- usage of fresh water for rinsing, continous counterflow
- usage of fresh water for rinsing, part of rinsing water is used for main wash, remaining part in pre wash
- fresh water inlet in the beginning of the process, continous waterflow in parallel to load
What is a problem of continous bathflow?
- insufficient disinfection
- carry-over of bound liquor by laundry or the mechanism of transport
- carry-over of germs from press to pre wash area
What is a problem of counterflow?
- location of detergents`dosage
- profuseness of water
- carry-over of germs from press area to the pre wash area
Which construction-parameter influence detergents`allocation?
- time, temperature, chemistry, mechanics
- kind of textiles and of detergents
- kind of drums, division into compartments, bath flow, finishing department, fresh water inlet
Which operating parameters influence the allocation of the detergents?
- kind of textiles and of detergents
- carry-over, residual moisture, liquor ratios, cycle time
- time, temperature, chemistry, mechanics
How can dosage influence the allocation of detergents?
- kind of dosage: simple time-amount-dosage, conductivity measures, twofold time-amount dosage
- the higher the dose, the better the equal distribution
- not at all
By what is "mechanics" determined?
- load ratio and liquor ratio only
- drum diameter and reversing only
- drum diameter, revolutions of drum, kind of drum movement, angle of rotation/falling angle, reversing, ribs (form, height, arrangement), load ratio, liquor ratio
The constituents of mechanics are
- water and temperature
- rotating, oscillating
- rubbing, compressing, flow through
Which kind of mechanics is more advantageously?
- rubbing
- rotating
- compression
Which one is the advantage of compressing as mechanical action in washing process?
- quicker adsorption of chemistry, quicker rinse, less surface-roughing, less "pilling", no distortion of laundry
- it is cheaper
- no one, because compressing is not the best kind of mechanical action
How is the division of the compartments of a tunnel washer?
- soaking zone, main wash zone I, rinse zone I, spinning zone I, main wash zone II, rinse zone II, spinning zone II
- soaking zone, pre wash zone, main wash zone, rinsing zone, finishing zone, dewatering
- soaking zone, main wash zone, rinsing zone, spinning zone
There are several processes for disinfection. How does thermal disinfection work?
- 90° for 10 min or 85°C for 15 min
- 85°C for 10 min
- 100°C for 10 min
Thermal disinfection is capable for which materials?
- polyester and other synthetic fibres
- cotton
- PES/CO blended fabrics
How does chemical-thermal disinfection work?
- temperature and disinfection agent, 30 to 70°C, 10 to 20 min
- temperature and disinfection agent, 90°C, 10 to 20 min.
- temperature and disinfection agent, 85°C, 15 min
How does chemical disinfection work?
- it does not work
- disinfection agent, temperature 5°C, 20 min
- disinfection agent, room temperature, 12h
Which statement is correct in relation to "cool-down"?
- to be applied for blended fabrics, cool down for 3 to 4 K per min
- to be applied for cotton, cool down for 3 to 4 K per sec.
- to be applied for cotton, cool down for 10 K per min.
What is bleaching for?
- to remove stains which cannot be removed by detergents
- to bleach discoloration
- no special use, applied traditionally for linen
Common bleaching proceses are
- acetic acid, citric acid
- H2O2, Na-perborate, Na-percarbonate, peracetic acids, chlorine bleach
- potassium permanganate