1. Thaum lub sij hawm extrusion txheej txheem, cov khoom siv polypropylene hloov los ntawm lub xeev iav mus rau lub xeev molten. Ntxiv nrog rau qhov ntsuas kub uas yuav tsum tau ua rau plasticizing cov khoom siv nrog cov khoom siv cua sov kom cov khoom tuaj yeem ua tiav cov khoom zoo tshaj plaws, melting thiab nias kuj yog ib qho tseem ceeb ntawm kev tswj xyuas. Txij li thaum cov khoom raug cuam tshuam los ntawm kev tuag tsis kam thiab compression piv ntawm txhua ntu ntawm cov ntsia hlau thaum lub sij hawm extrusion txheej txheem, nws tsis muaj nyob rau ntawm ib txwm siab. Rau ntau hom kev tuag, qhov sib piv ntawm txhua ntu ntawm cov ntsia hlau yog qhov tseem ceeb thiab hloov tsis tau.
2. Nyob rau hauv qhov tseeb hais tias lub extrusion ceev ntawm cov yas hose extruder tseem tsis hloov, yog hais tias tus ceev ceev pub yog nce los yog txo, cov khoom ntim ntawm cov ntsia hlau nyob rau hauv seem pub mis yuav hloov, thiab cov khoom ntim nyob rau hauv cov pa seem yuav nyob twj ywm unchanged. , yog li cov khoom noj thiab seem compression yuav Raws li qhov sib piv compression hloov, lub yaj siab nce los yog txo; thaum lub sij hawm pub ceev tseem tsis hloov, qhov extrusion ceev nce los yog txo, thiab cov khoom siv ntsia hlau ntim hauv seem pub kuj hloov. Cov khoom ntim hauv seem seem tsis hloov pauv, yog li cov khoom noj thiab ntu compression hloov nrog qhov sib piv compression, thiab cov yaj siab nce los yog qis dua; qhov kev pub mis nrawm nce lossis txo ib txhij nrog qhov nrawm nrawm, vim tias cov khoom siv ntsia hlau ntim hauv ntu pub mis tsis hloov. Kev hloov pauv tsuas yog kev hloov pauv hauv lub siab melting tshwm sim los ntawm kev nce lossis txo qhov nrawm.
