India leh Southeast‐Asia-a local herb tam tak chu food‐medicine‐homologous raw‐materials-ah an tel a ni. Processor tam zawk chuan traditional sun‐drying leh hot‐air‐drying chu vacuum freeze‐drying hmangin an thlak a, chu chuan plant polyphenols, volatile oils leh active substance dangte chu a tam thei ang berin an humhim a ni. Chuti chung pawh chuan, herbal material-ah chuan fiber structure complex tak a awm a. Herb thenkhatah chuan volatile‐oil content sang tak an nei a, freeze‐drying laiin activity loss, volatile‐oil escape leh fragment‐curling defects te an tuar thin.
Pretreatment hian hmun pawimawh tak a chang a ni. Thlai chi hrang hrang thliar hrang la, bawlhhlawh ro tawhte chu paih chhuak rawh; thlai hmun (hnah emaw rhizome emaw) a zirin chopping emaw whole‐plant processing emaw thlang rawh. Silfai zawh vat la, tuiah a inthiar theih active components te nasa taka a inthiar loh nan hun rei tak chhunga tuiah inbual loh tur. Tray‐loading hmain lei chung tui chu a chhuak kim vek tur a ni. Rhizome herb thenkhat chu freeze‐drying performance mumal tak neih theih nan uniform thickness-ah slice tur a ni.
Eutectic point hrang hrang nei leaf‐type leh rhizome‐type herbs tan chuan pre‐freezing mamawh a inang lo. Thin leaf‐materials te hian pre‐freezing hun rei zawk an mamawh a ni. Thick rhizome te hian core‐freezing kimchang tak neih theih nan temperature hniam zawk leh holding‐time rei zawk an mamawh a ni. Pre‐freezing kim lo hian sublimation phase-ah partial melting a thlen a, active substances te chu nasa takin a tichhia a ni.
Sublimation phase-ah volatile oils te venhim tur a ni. Volatile‐oils hi temperature sang takah chuan awlsam takin a tlanchhuak thei a, chuvangin shelf temperature hi a sang lutuk tur a ni lo. Mitdel ang maiin fast cycle zawm suh; over‐rapid sublimation hian volatile effective constituents hloh a tizual a ni. Sublimation efficiency leh activity retention balance turin moderate‐vacuum hmang rawh.
Discharge atan: herbal goods siam zawh tawhte hian pores tha tak tak an nei a, moisture an absorb rang hle. Pressure‐release lai hian inert‐gas back‐filling hi hman a tha. Discharge hnuah packaging tan nghal la, air‐exposure duration tih tlem rawh. Moisture‐absorbed herbal products hian quality a tichhe nasa hle a, mildew lakah pawh a hlauhawm hle.
Chu bakah, change‐over cleaning pawh ngaihven rawh. Herb tam tak chuan special volatile odor an tichhuak thin. Cross‐flavor awm loh nan food‐material batch dang lama inthlak hmain uluk taka tihfai leh tihthianghlim a ngai a ni. Full‐chain control-ah hian sorting‐washing, differentiated pre‐freezing, low‐temperature sublimation leh fast discharging‐packaging te pawh a tel a, hei hian high‐activity freeze‐dried herbal output a siam thei a ni.
