Ib qho ntsia hlau feem ntau muab faib ua peb ntu raws li qhov ua tau zoo. Qhov ntev ntawm peb ntu yog txiav txim siab raws li txoj kab uas hla, lub suab thiab qhov tob ntawm cov ntsia hlau, uas feem ntau muab faib los ntawm ib feem peb ntawm txhua qhov.
Cov xov kawg ntawm cov khoom siv qhov chaw nres nkoj hu ua seem conveying: cov khoom yuav tsum tsis txhob plasticized ntawm no, tab sis nws yuav tsum tau preheated thiab compacted. Yav dhau los, txoj kev xav extrusion qub tau ntseeg tias cov khoom ntawm no yog xoob, thiab tom qab ntawd tau ua pov thawj tias cov khoom ntawm no yog qhov tseeb Cov khoom ntsaws txhais tau hais tias cov khoom ntawm no yog cov khoom zoo li lub ntsaws tom qab raug nyem, ntev li ntev raws li txoj haujlwm thauj khoom. ua tiav, nws yog nws txoj haujlwm.
Qhov thib ob yog hu ua ntu compression. Lub sijhawm no, qhov ntim ntawm cov ntsia hlau zawj maj mam ua me me, thiab qhov kub yuav tsum ncav cuag qib ntawm plasticization ntawm cov khoom. Lub compression tsim ntawm no yog los ntawm seem conveying peb, thiab ntawm no yog compressed rau ib. Qhov no yog hu ua compression piv ntawm cov ntsia hlau --- 3: 1. Qee lub tshuab kuj tau hloov pauv, thiab cov khoom siv yas nkag mus rau theem peb.
Qhov thib peb yog seem metering, qhov twg cov khoom tuav lub plasticizing kub, tab sis cov khoom yaj yog raug thiab quantitatively thauj zoo li lub metering twj tso kua mis muab lub taub hau tshuab. Lub sijhawm no, qhov kub tsis tuaj yeem qis dua qhov kub ntawm plasticizing, feem ntau me ntsis siab dua.