Nrog kev txhim kho cov neeg nyob ua ke, cov khoom pov thawj ntawm plastics kuj yog qhov tseem ceeb heev. Rau nws ua tau zoo, Xiaobian tam sim no qhia txog kev paub txog koj rau hauv kev nthuav dav, yog li ntawd koj yuav ua tau ntau yam meej. Cov yas extrusion yog ib qho amorphous polymer uas tsis muaj kev taw qhia melting thiab yog malleable thaum heated rau 120-150 ° C.
Txij li cov pvc yas extrusion muaj tsis thermal stability, tus nqi tsawg HCl tawm ntawm no kub los txhawb ntxiv decomposition, ces nws yuav tsum ntxiv ib alkaline stabilizer thiab HCl rau inhibit catalytic cracking Event. Pure PVC yog ib yam khoom nyuaj. Nws yuav tsum tau ntxiv nrog ib tus nqi ntawm cov yas yas kom nws muag. Rau ntau cov khoom, additives xws li UV absorbers, fillers, lubricants, pigments, anti-fungal cov neeg ua hauj lawm, etc. yuav tsum tau los txhim kho PVC khoom. Siv kev ua haujlwm. Xws li nrog lwm cov khoom, cov khoom ntawm cov duab txheeb xyuas seb qhov kev ua haujlwm zoo thiab ua tiav ntawm cov khoom. Rau PVC, kev ua haujlwm ntawm cov khoom uas siv los ua: cov khoom me me, thermal stability, phaus molecular, fisheye, bulk density, purity thiab txawv teb chaws, porosity. Rau cov hnab looj tes PVC thiab viscosity thiab gelling cov khoom ntawm lub mash, nws yuav tsum tau txiav txim siab los pab txhawb kev nkag siab ntawm kev ua hauj lwm thiab cov khoom zoo.
1. Tej lub hom phiaj:
1) Cov khoom siv raw muaj plua plav (fluidity);
2) Cov khoom siv raw yog ib qho yooj yim tsim kom muaj ib lub phab ntsa ntawm lub qhov vov nyob hauv nruab nrab ntawm lub raj qhwv, thiab tus choj ntawm ncej yog qhov xaus;
3) Qhov ntsuas kub siab dhau lawm;
4) Cov av nyob hauv qab ntawm hopper siab dhau lawm.
2, cov tswv yim daws teeb meem:
1) siv PVC nrog cov hmoov qhuav qhuav ntawm cov khoom tsim nyog;
2) Txhim kho tus neeg muab khoom noj los pab tiv thaiv kabmob, nquag xyuas thiab kev kho mob raws sijhawm;
3) Qhov seem noj yog txias los ntawm dej txias lossis qhov ntsuas kub ntawm qhov chaw pub mis yog txo qis;
4) Tshem cov khoom ntub tawm ntawm lub raj qhav kom cov raj npog qhuav.