Kev txhaj tshuaj molding tshuab ntsia hlau yog lub hauv paus tseem ceeb ntawm lub tshuab, feem ntau yog siv rau kev xa khoom, kev sib cog lus, melting, thiab cov ntaub ntawv yas raw khoom. Nws cov qauv thiab kev ua haujlwm ncaj qha cuam tshuam rau plasticizing efficiency thiab cov khoom zoo.
Cov ntsia hlau lub cev muaj cov khoom noj, seem compression, thiab seem homogenization. Cov khoom noj yog lub luag haujlwm rau preheating thiab conveying khoom raw khoom; seem compression ua tiav melting, sib tov, thiab venting; thiab seem homogenization ua kom lub uniformity ntawm yaj kub thiab txaus stability. Raws li qhov sib txawv ntawm cov khoom yas, cov ntsia hlau tuaj yeem muab faib ua peb hom: hom gradient (tsim rau cov cua sov- cov ntaub ntawv rhiab heev xws li PVC), abrupt hom (zoo rau polyolefins), thiab dav - hom phiaj. Qhov sib txawv tseem ceeb nyob hauv qhov ntev thiab shear zog tsim ntawm ntu compression. Cov tsis tseem ceeb muaj xws li txoj kab uas hla, nam piv, thiab compression piv, uas yuav tsum tau sib phim rau cov khoom siv los txhim kho cov nyhuv plasticizing. Cov khoom siv feem ntau yog siab- kub thiab hnav- cov ntaub ntawv tiv taus xws li 38CrMoAla alloy thiab tungsten carbide nickel{10}}raws li alloy. Thaum siv, txheej txheem preheating txheej txheem thiab tu thiab tu tsis tu ncua yog tsim nyog los tiv thaiv cov ntsia hlau slippage los yog txhua yam puas.
