Wok bilong draim i save kisim bikpela hat eneji. Long lukautim gut eneji, ol samting we i gat planti wara, ol 'suspension', o ol 'solution' we i gat ol strongpela samting insait long en, ol i save rausim wara pastaim long masin o hatim bilong rausim wara pastaim long ol i draim long wanpela 'air dryer' bilong kisim ol strongpela samting.
As tingting bilong draim em long inapim ol nid bilong yusim ol samting o wokim ol narapela samting. Olsem, draim diwai pastaim long wokim ol 'mold' o ol samting bilong diwai i save stopim 'deformation', na draim ol 'ceramic blank' pastaim long kukim i no inap bruk. Na tu, ol drai samting em i isi long karim na putim; Olsem, taim ol i draim ol wit samting we ol i kisim pinis i go inap long wanpela mak bilong wara, dispela i save pasim 'mold' long gro. Bikos 'natural drying' i no inap long inapim ol nid bilong prodaksen divelopmen, ol i wok long yusim ol kain kain 'mechanized air dryers'.
Long taim bilong draim, ol i mas pinisim hat na mas (wet) trensfe wantaim, na mekim gut olsem hap presa (konsentresen) bilong wet steam antap long pes bilong samting i antap moa long dispela long spes ausait, na olsem hat sos tempereja i antap long tempereja bilong samting.
Hat i save go long bikpela -temperature hat sos i go long wetpela samting long kain kain rot, na dispela i mekim na wara i stap antap long samting i kamap olsem steam na i go ausait long spes, na dispela i kamapim senis long wara namel long samting i stap antap na insait bilong en. Wara insait long en i save go nabaut na i go antap long graun, na i save daunim wara insait long samting na isi isi i pinisim wok bilong draim.
Drai bilong dispela samting i dipen long 'surface vaporization rate' na 'internal moisture diffusion rate'. Planti taim, mak bilong drai long ol namba wan hap em i save stap aninit long kontrol bilong mak bilong 'surface vaporization'. Bihain, sapos ol samting i drai ausait i no senis, mak bilong draim na temperaja bilong dispela samting i stap wankain; dispela step ol i kolim 'constant-rate drying stej'. Taim wara insait long samting i go daun long wanpela mak, mak bilong wara insait long en i go daun na i go liklik long mak bilong 'surface vaporization'. Long dispela taim, 'drying rate' i save kamap long 'internal diffusion rate' na i save go daun oltaim wantaim 'moisture content' i go daun moa; Dispela step ol i kolim 'falling-rate drying stej.