Across the chain · topic 4 of 5
Equipment
The machines of coffee, from pulpers and dryers to roasters, grinders and brewers: how they work and what they change.
- ProcessPulpingThe first step of wet processing – a machine squeezes the seeds out of the fresh cherry and strips off the skin and pulp, leaving the seeds in their mucilage and parchment.Source-checked
- ProcessMechanical demucilagingRemoving the mucilage from pulped coffee by mechanical agitation in a machine instead of by fermentation – fast, low in water, and at the heart of Colombia's ecological wet milling.Source-checked
- ProcessDryingThe post-harvest step that lowers the moisture of coffee – as parchment, whole cherry or honey coffee – to a level safe for storage, in the sun, in solar dryers or in mechanical dryers.Source-checked
- ProcessHulling and dry millingThe dry-mill steps that turn dried parchment or dried cherry into export-ready green coffee – hulling, polishing, grading, sorting and bagging.Source-checked
- ProcessGrading and sorting of green coffeeHow green coffee is separated by bean size, density and colour, and how defects are counted to give a lot its grade – screens in 64ths of an inch, gravity tables, optical sorters and defect equivalents.Source-checked
- ProcessMechanical dryersMachines that dry coffee with forced, heated air – static beds, rotating drums, vertical columns and silos. How they move air and coffee, how they are heated and fuelled, and how they are run without harming the seed.Source-checked
- RoastRoastingDry heat that turns dense, green coffee seeds into brittle, porous, brown beans – forming aroma, taste and colour, driving off water and building up carbon dioxide.Source-checked
- RoastPreheating and chargeThe first step of a roast – heating the empty roaster to a steady state, then charging the green coffee. What charge temperature means, why the probe reading drops to a turning point, and what studies show.Source-checked
- RoastCooling and quenchingThe last step of the roast – how air coolers and water quenching stop the roast at the intended degree, why quench water stays in the bean, and what it changes for grinding, freshness and the legal moisture limit.Source-checked
- RoastRoast profilesThe time–temperature curve of a roast – what the probes really measure, how rate of rise, turning point, first crack and development time are read, how roasters steer the curve, and what research says about profiles and flavour.Source-checked
- RoastTurning pointThe lowest bean-probe reading after the charge, where the curve stops falling and starts to climb. Why it is a feature of the probe rather than the beans, what moves it, and what it can and cannot tell a roaster.Source-checked
- RoastAirflowThe stream of air drawn through a coffee roaster – how it carries heat to the beans, takes water vapour and chaff away, how much air different roaster designs use, and what changing it does to the roast.Source-checked
- RoastRoast degree and colourHow far a coffee has been roasted, and how it is measured – mostly as colour, by reflected light on ground coffee – with the scales in use, why they do not convert, and what colour does and does not tell.Source-checked
- RoastDrum roastersThe most widespread batch coffee roaster – a heated, rotating drum through which hot air is drawn. How it is built, how heat reaches the beans, what the burner, airflow and drum speed controls do, and how batch size changes bean motion.Source-checked
- RoastFluid-bed roastersHot-air roasters with no moving parts in the roasting chamber – a stream of hot air lifts, mixes and heats the beans, mainly by convection. Common in research, in sample roasting and in some industrial designs.Source-checked
- RoastTangential and centrifugal roastersTwo industrial batch roaster designs that move the beans without turning a drum – rotating paddles in a fixed chamber, or a spinning bowl with fixed guides – and how their air paths differ from a drum's.Source-checked
- RoastRoaster emissionsWhat leaves a coffee roastery through its stacks – smoke, volatile organic compounds, carbon monoxide, dust and chaff – where it comes from, why it rises late in the roast, how it is cleaned and how authorities regulate it.Source-checked
- RoastCoffee packagingWhat packaging for roasted coffee has to do, how its materials trade barrier against recyclability, how packaging compares with wasted coffee in life-cycle studies, and the packaging and capsule rules in the EU and beyond.Source-checked
- BrewWater for coffeeWhy brewing water matters, where its minerals come from, how hardness and alkalinity shape flavour and machines, which targets are published, and how water is measured and treated.Source-checked
- BrewWater treatmentHow filters, ion exchangers, reverse osmosis and added salts change brewing water – what each removes or adds, which suits which tap water, and how to keep a treatment system clean and working.Source-checked
- BrewGrinder types and burrsHow coffee grinders break beans – blades, conical burrs, flat burrs and industrial roller mills – and how the shape, gap, wear and temperature of the grinding parts change particle sizes, fines, heat and retention.Source-checked
- BrewStatic and retentionGrinding charges coffee particles with static electricity, so grounds clump and cling inside the grinder. What sets the charge, what a little water on the beans does, and how much coffee stays behind between doses.Source-checked
- BrewGrinder careWhat builds up and wears inside a coffee grinder – old grounds, oxidising coffee oil, fines, worn or misaligned burrs, microbes – and what food-hygiene rules and the few studies say about cleaning it.Source-checked
- BrewPour-over and immersionHow the main non-espresso brew methods work – percolation, where fresh water flows through the grounds, and immersion, where all the water steeps with all the coffee – and what each device changes.Source-checked
- BrewPour-over techniqueHow a manual pour-over works step by step – ratio, grind, water temperature, bloom, pouring and drawdown – how filter and dripper shape change the cup, and how to adjust the grind, with published example values.Source-checked
- BrewMoka potA stove-top coffee maker in which heated air and vapour in a closed lower chamber push water up through a bed of ground coffee into an upper chamber, at far lower pressure than an espresso machine.Source-checked
- BrewFilter coffee machinesAn automatic drip machine heats water in a tube, lifts it with steam bubbles and sprays it over ground coffee in a paper filter. The entry covers its parts, its test standards and the rules on holding and switch-off.Source-checked
- BrewHow an espresso machine worksAn espresso machine heats water, pressurises it to about 9 bar, spreads it over a compacted bed of fine coffee and ends the shot. The entry covers how pumps, boilers, groups and levers do these jobs and how the coffee bed resists the water.Source-checked
- BrewPuck preparationHow ground coffee is dosed, distributed and tamped into an espresso basket. The aim is an even bed, so that water passes through all of it instead of channelling through a few paths.Source-checked
- BrewHistory of the espresso machineHow the espresso machine developed from steam-boiler bar machines to spring levers, hydraulic groups and pumps with heat exchangers, dated from patent records and historians, with the disputed firsts marked.Source-checked
- BrewEspresso machine careWhat builds up inside an espresso machine – scale, milk residues and bacteria – what tests found about metals released after descaling, and what the evidence does and does not say about cleaning.Source-checked
- BrewCoffee capsulesA coffee capsule is a sealed single dose of ground coffee that its machine pierces and brews under pressure. How a capsule opens and brews, what studies measured in the cup, and where the system came from.Source-checked
- BrewHow capsules are madeHow single-serve coffee capsules are made – forming the body, grinding and degassing the coffee, dosing, removing oxygen and sealing the lid – and what storage studies show about barrier, oxygen and freshness.Source-checked
- BrewSingle-serve beyond capsulesThe other ways to brew one cup from a pre-measured dose – paper espresso pods, soft pads for pad machines, drip bags hung on the cup and coffee bags steeped like tea – how each is built and what the few studies measured.Source-checked
- BrewHistory of brewingHow coffee brewing moved from boiling in a pot to drip pots, percolators, vacuum brewers, paper filters and plunger pots, and which of the usual dates rest on patents and which only on later accounts.Source-checked
Each entry lives in its own stage and is listed here because it is tagged equipment.