Tom qab kev sib tsoo ua ntej ntawm cov khoom siv raw khoom tiav, cov ntaub ntawv raw tseem muaj cua ntau, thiab cov qauv ntawm cov av nkos ncuav mog qab zib tau los ntawm cov xovxwm lim tsis zoo ib yam.Yog hais tias cov av nkos ncuav mog qab zib nrog cov qauv tsis sib xws yog siv ncaj qha rau kev tsim khoom, nws yuav ua rau lub cev tsis sib xws ntawm lub cev ntsuab thaum lub sijhawm ziab thiab tua, ua rau deformation thiab tawg.Tom qab kev cob qhia ntxhib, lub tshuab nqus tsev ntawm cov av nkos feem ntau yuav tsum tau mus txog ntawm 0.095-0.1.Lwm qhov zoo dua ntawm cov ncuav mog qab zib ntxhib yog cov av nkos ncuav mog qab zib yog ua rau hauv ib qho me me ntawm cov av nkos, uas yooj yim rau kev thauj mus los thiab khaws cia.Nws kuj muab kev yooj yim rau kev tsim khoom tom ntej.

Muab cov av nkos ntxhib rau hauv qee qhov kub thiab txias ib puag ncig rau lub sijhawm, cov txheej txheem no hu ua staleness.Lub luag haujlwm tseem ceeb ntawm staleness yog: ua kom cov dej hauv cov av nkos ntau qhov sib npaug ntawm qhov kev txiav txim ntawm capillary;nce cov ntsiab lus ntawm humic acid, txhim kho cov viscosity ntawm cov av nkos, thiab txhim kho kev ua haujlwm molding;Qee qhov oxidation thiab txo cov tshuaj tiv thaiv tshwm sim los ua kom cov av nkos xoob thiab zoo ib yam.Tom qab kev laus, lub zog ntawm lub cev ntsuab tuaj yeem txhim kho thiab lub sijhawm ntawm deformation thaum tua hluav taws tuaj yeem raug txo.Feem ntau nws yuav siv 5-7 hnub rau qhov stale, thiab muaj 3 hnub rau cov ceev ceev.Tom qab lub sijhawm ntev ntawm kev laus, cov khoom lag luam tsis yooj yim deformed vim tsis sib xws ntawm cov dej noo thiab cov cua npuas, uas zoo dua lav cov khoom zoo.