Glossary

Air-blow

Feature of a press or garment body-former capable of blowing hot air through the fabric to dry and set it in a crease-free condition.

Bag A

Batch of work for the continuous tunnel washer.

Base plate

Perforated plate at the bottom of the hydro-extraction press, through which the extracted
water drains.

Bio-contamination

The concentration or presence of micro-organisms in wash water or on the laundered textiles.

Blowdown

Dirty water discharged regularly from the laundry boiler to prevent the build-up
of impurities.

Cage

The perforated basket of a washer extractor or tumble dryer into which the textiles are
placed for processing.

Cake, cheese

Alternative terms for cylindrical batch of de-watered textiles from the membrane press.

Calendar

Roller ironing machine (see Multi-roll ironer)

CBTW

Continuous batch tunnel washer

Condensate

The high pressure hot water formed when steam condenses and gives up its heat to the laundry process.

Condensate main

The pipe which carries the water produced by condensing steam back to the boiler house.

Continuous tunnel washer (CTW)

A multi-stage washing machine in which the work being washed advances from stage tostage via an Archimedean screw.

Cycle

A complete programme, eg in a washing machine.

Damped dip tube

A transparent tube at the side of a washer extractor, constricted to produce a stable indication of water level.

De-watered

Textiles from which the moisture has been largely removed by spinning in a washer extractor or squeezing in a membrane press.

Dip

The water level in a washer extractor measured from the inside of the rotating cage at the
lowest point.

Direct gas-fi red

Laundry equipment (usually tumble dryer or tunnel finisher) which incorporates a gas burner as its source of heating.

Distillation

Purification of dry cleaning solvent by boiling it in a still to generate pure solvent vapour, which can then be condensed for reuse.

Door seal

A strip of compressible foam padding around door openings designed to prevent cold air leakage into a tumble dryer.

Dry cleaning

Stain removal, washing in liquid solvent and expert pressing.

Effluent

The dirty water discharged from the pre-wash and from the main-wash.

End-of-cycle terminator

A device on a tumble dryer which senses when the goods are dry and automatically ends the cycle.

Filtration

The removal of solid contamination by passing liquid through a fabric, mesh or screen.

Finishing.

Ironing or pressing.

Flash steam

The low pressure steam liberated when high pressure liquid condensate enters the condensate main.

Flatwork

Sheets, towels, pillowcases and table linen.

Free-steam

Laundry equipment which is capable of blowing steam directly through the item.

G-force

The force exerted on the wet textiles by spinning in a washer extractor.

Heater battery

A device consisting of metal tubes (sometimes with metal fi ns fitted to them) inside which steam condenses, giving up its heat to the drying air stream in the process. Used in tumble dryers and garment tunnel finishers.

Hydro-extraction press

The de-watering device at the end of a continuous tunnel washer, consisting of a high pressure ram and a cylindrical press basket (also called a membrane press).

Injectors or sparger

Devices for introducing steam into the wash water in a continuous tunnel washer.

Interspin

A short low-speed spin inserted between the rinses in a washer extractor programme to reduce the number of rinses required.

Inverter

An electrical device which greatly reduces the power needed to drive machinery by improving the conversion efficiency.

Ironer tape

A narrow fabric tape used to guide textile items through the ironer.

Launderette

An area where washing, drying and ironing equipment is used on a self service basis.

Lint

Cotton fibers which come off textiles and may, for example, block up the filters on the tumble dryer.

Mechanical hydro extraction

The process of de-watering textiles by mechanical spinning or squeezing rather than by the use of heat to evaporate the moisture.

Membrane press

An alternative name for hydro-extraction press.

Moisture retention

The retention of residual moisture in de-watered textiles, expressed as a percentage of the dry weight of the textiles.

Multi-roll ironer

A drying and crease removal device in which the flat, wet textile is held by a succession of rolls against their respective heated beds.

Needle-felt

The porous cladding of the perforated rolls on a multi-roll ironer, through which the water vapour from the drying sheet is drawn.

Peg

The location for one garment (on hanger) on the conveyor which travels through the tunnel finisher.

Perchloroethylene

A pure chemical used as a dry cleaning solvent.

Press basket

The shaped base to a hydro-extraction press which forms the cylindrical ‘cake’ of dewatered textiles.

Press cushion

Alternative name for the hollow rubber membrane on the face of the ram of the hydroextraction press which is filled with water at up to 50 bar pressure.

Pressure creases

Sharp creases in polyester textiles caused by the effect of heat and/or pressure.

Pressure pump

A device which raises the pressure inside the membrane on a hydro-extraction press.

Pre-wash

The first stage in the wash process, carried out at low temperature.

The Carbon Trust

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Programmable micro-processor

An electronic controller which can be programmed to deliver precisely the required sequence of steps.

Shuttle conveyor

A mobile conveyor which takes the cheese of de-watered textiles from the hydro extraction press and delivers it into the next available tumble dryer.

Single roll ironer

A drying and crease removal device in which the flat, wet textile is held against a heated roll or heated bed.

Spin drying

The process of de-watering textiles by high speed rotation in a perforated cage (as in a washer extractor or a domestic washing machine).

Spin speed

The rotational velocity of the washer extractor cage during the fi nal extract (spin dry) in
revolutions per minute.

Steam chest

A hollow ironer bed in which steam condenses.

Surplussing valve

A relief valve for flash steam systems which releases excess fl ash steam not required for its primary function to a secondary function.

Textile rental

The business of hiring out flatwork and garments to end-users which includes regular cleansing and replacements.

Thermal disinfection

Technique for killing micro-organisms in the wash which relies on the maintenance of certain time/temperature combinations.

Tumble dryer

A device for drying or partially drying textiles (or for breaking up the dewatered ‘cake’) in which the items are place in a rotating perforated cage through which hot air is passed.

Tunnel finisher

A tunnel shaped device, into which steam and hot air are injected and through which garments (on hangers) pass, so that they emerge dry and crease-free.

Washer extractor

A washing machine that is similar in range of functions to (but more robust than) a domestic washing machine.

Washer extractor sump

The chamber at the base of a washer extractor into which water, steam and chemicals are injected at the appropriate point in the wash cycle.

Yellowing or galling

The consequence of drying work which has not been properly rinsed (caused by reaction between detergent residues and the oxygen in the air).