2 washing process, 3 ... in washer extractors

What is the domain of washer extractors?
1. sensitive laundry, heavily soiled laundry, high quality workwear, infecteous laundry, cleanroom laundry, OP-theatre
2. linen, underwear, old people`s home laundry
3. work wear from meat and fish industry
For washer extractors, a variety of washing programs exists. Washing means:
1. to clean with water and adoption of the factors temperature, mechanics and chemistry.
2. to clean sensitive outer wear with adapted programs (e.g. low temperature washing process)
3. to clean with non-polar solvents with adapted programms and cleaning agents
Dry-clean means:
1. to clean with water and adoption of the factors temperature, mechanics and chemistry.
2. to clean sensitive outer wear with adapted programs (e.g. low temperature washing process)
3. to clean with non-polar solvents with adapted programms and cleaning agents
Wet-clean means:
1. to clean with water and adoption of the factors temperature, mechanics and chemistry.
2. to clean sensitive outer wear with adapted programs (e.g. low temperature washing process)
3. to clean with non-polar solvents with adapted programms and cleaning agents
Which are the requirements for wet-clean?
1. low mechanics and usage of adapted detergents
2. high mechanics and strongly acting detergents
3. non-polar solvents and high mechanics
Which are the requirements machinery has to fulfil tor wet-cleaning?
1. big drum volume, possibility of free program design, possibility to control temperature exactly
2. extralarge devices for dosage, filter systems for harmful substances, automatic dosage control units for the detergents
3. small drum volume, certain washing programmes which are programmed, filte for harmful substances
Dry-cleaning is for textiles who cannot tolerate water as a polar solvent. Advantages of dry-cleaning are:
1. removal of sweat and odour is optimally
2. good to very good removal of soiling and good to satisfactorily removal of stains
3. generally no shrinkage
Which are the advantages of wet-clean?
1. removal of sweat and odour is optimally
2. no bleeding of colours, no discolouring
3. generally no shrinkage
Which are textiles capable for wet-cleaning?
1. water-repellent textiles, cotton textiles, wool-, angora textiles, blankets, curtains, mats
2. heavily (oily) soiled workwear
3. workwear from meat and fish industry
Which of the following descriptions describes a washing programm for wet-clean?
1. pre wash, main wash, rinsing with intermediate spin, finish, spinning
2. pre wash, main wash I, rinsing with intermediate spin, main wash II, spinning
3. imbruing, main wash I, rinsing with intermediate spin, main wash II, spinning
Which one of the following ist the purpose of pre wash?
1. rapid wettening of the laundry, swelling of soil, removal of heavy soil from the laundry, swelling and dissolving of spots
2. wettening of the laundry and equally dispersing of the detergent
3. steadily heating of the laundry, wettening of laundry and detergent dosage for the washing process
How long does the pre wash take?
1. 4-5 min.
2. 8-12 min
3. 10-15 min.
Pre-wash: which temparature(s)?
1. Always at the same level: 30øC
2. Depending on the soiling: protein-containing soil: 20 to 25øC, fatty/oily soiling 50 to 60øC
3. Depending on the soiling: protein-containing soil: 50 to 60øC, fatty/oily soiling 20 to 25øC
Which of the following ones is the purpose of pre-wash?
1. completely soil-removal
2. removal of remaining soil, removal of oxidative spots, chemical or thermal disinfection, optical bleach
Duration of main wash in washer extractors?
1. 1-2 h
2. 10-15 min at temperature level
3. 45 min at temperature level
Which one is the purpose of rinsing?
1. Removal of remaining soil and remaining detergents
2. Removal of remaining detergents and disinfection
3. disinfection and action of diluents for better press properties
Which of the following statements is appropriate concerning spinning in a washer extractor?
1. mechanical dewatering by force of centrifugation, g-factor up to 600, duratuion: 5 to 10 min.
2. mechanical dewatering by press, duration: 1 min.
3. mechanical dewatering by force of centrifugation, g-factor up to 900, Duration: 15 min.
Which of the following is a water recovery system for washer extractors?
1. "Re- usage of rinsing water e.g. in main wash (storage tanks), ""cascade principle"""
2. for a washer extractor, water recovery is not possible
3. it is only possible to remove hazardous substances out of the water for better discharging conditions (environmental protection, fees).
"What does ""cascade principle"" mean? "
1. the cascade principle is a water recovery system: water from hygienic sensitive laundry can be re-used for washing of less sensitive laundry (hotel laundry - work wear - wiping cloths, mats)
2. "cascade principle describes a special water treatment system. Waste water flows through a device ""in cascades"". That is, dissolved ans suspended solids will be removed by mechanical action."
3. "the cascade principle is a special dosage system. Single detergent`s components flow through a device ""in cascades"" and will be added to the washing process."

2 washing process, 3 ... in washer extractors

We now come to the saving possibilities. That is, there are a lot of possibilities to design a sustainable process. Module 3 chapter 4 handled two of them.