Kev npaj rau lub caij ntuj so no tsis yog tsuas yog yuav khoom ntawm ib tug tshiab dai nplua , tab sis kuj xaiv ntawm ib tus phuam phuam. Thaum lub caij so ntawm lub hiav txwv lossis so haujlwm ntawm ntug dej ntawm ib lub pas dej los me me dej no qhov khoom siv yog qhov tseem ceeb tshaj plaws. Nws tuaj yeem siv tsis yog tsuas yog muab lub cev tom qab da dej, tab sis kuj yog khib nyiab thaum lub hnub poob. Yog li ntawd, ib lub phuam da dej yuav tsum muaj qee yam zoo:
- cov phuam yuav tsum muaj lub siab hygroscopicity, uas yog, nws absorbs noo noo zoo;
- qhov muag ntawm qhov khoom tseem ceeb, tshwj xeeb tshaj yog thaum nws los xaiv qhov phuam so rau cov menyuam yaus;
- cov qauv ntawm cov ntaub yuav tsum yog resistant, txwv tsis pub tom qab ntxuav koj lub ci pav lim dej yuav tig mus rau hauv ib daim ntaub ntawm daim ntaub pleev;
- Yooj yim ntawm txoj kev kho mob tseem ceeb heev - lub phuam da dej yuav tsum yooj yim hnav thiab qhuav sai sai.
Raws li cov ntaub ntawv, cov phuam da dej ntawm paj rwb los yog xyoob fiber ntau yog qhov zoo tshaj plaws. Hais txog paj rwb, nws yog ib qho tseem ceeb txhais tau tias yog ib qho khoom qab ntxiag, tsis yog ib qho khoob, raws li qhov xub thawj yog qhov ntau txaus thiab ntau qab ntxig rau qhov kev sib tham. Nyob rau hauv kev txhawb nqa ntawm xws li cov ntaub ntawv raws li xyoob fib ntau, nws yuav hais tau tias cov phuam ua los ntawm nws nqus ntau dua noo noo. Ua kom txoj phuam qhuav sai, lub pob txig rau ntawm daim ntaub yuav tsum tsis txhob ntev dhau - qhov no yog qhov txawv ntawm lub phuam phuam los ntawm da dej.
Qhov loj ntawm lub phuam da dej yog qhov tseem ceeb. Yog hais tias nws yog tsawg dhau, ces cov khoom siv tsis tau siv raws li ib tug pav lev. Yog tias, ntawm qhov tsis sib xws, nws qhov ntev tshaj qhov standard ones, ces nws yuav ua tau tiring mus cab nws txhua hnub mus rau lub puam.
Kom siab tshaj rau ntawm lub puam, koj tuaj yeem yuav ib lub phuam so tes nrog lub hauv ncoo. Nws yuav qhuav lub cev los ntawm dej thiab nrog kev lom zem so tom qab da dej.