I-PVC luhlobo lweplastiki olusetyenziswa kakhulu kwizixhobo zokwakha. Ke ngoko, ayizukutshintshwa ixesha elide kwixesha elizayo, kwaye iya kuba namathuba amahle okusetyenziswa kwiindawo ezingaphuhliswanga kakuhle kwixesha elizayo.
Njengoko sonke sisazi, kukho iindlela ezimbini zokuvelisa i-PVC, enye yindlela ye-ethylene eqhelekileyo yamazwe ngamazwe, kwaye enye yindlela ye-calcium carbide ekhethekileyo eTshayina. Imithombo yendlela ye-ethylene ikakhulu yi-petroleum, ngelixa imithombo yendlela ye-calcium carbide ikakhulu ngamalahle, ilimestone kunye netyuwa. Ezi zixhobo zigxile kakhulu eTshayina. Kangangexesha elide, indlela ye-PVC ye-calcium carbide yaseTshayina ibikwindawo ekhokelayo ngokupheleleyo. Ingakumbi ukususela ngo-2008 ukuya ku-2014, amandla emveliso ye-PVC yaseTshayina yendlela ye-calcium carbide ebesanda, kodwa ikwazise neengxaki ezininzi zokukhusela okusingqongileyo.
Ukusetyenziswa kwamandla kwemveliso ye-calcium carbide kukhulu kakhulu, ngoko ke oku kuya kubangela imingeni ethile kumbane waseTshayina. Ngenxa yokuba umbane uveliswa kukutsha kwamalahle, kufuneka usebenzise amalahle amaninzi, ngoko ke ukutsha kwamalahle kuya kungcolisa umoya. Nangona kunjalo, iTshayina yenze utshintsho oluthile kwimigaqo-nkqubo kule minyaka idlulileyo. ITshayina ihlala iphucula uthotho lwayo lwemizi-mveliso. Ngoku sinokubona ukuba iTshayina ingenise ioyile eninzi, kwaye amashishini asekuhlaleni akhuthazwa ukuba angenise ioyile ukuze acoce iimveliso ezisezantsi. Ke ngoko, kwiminyaka yakutshanje, abavelisi abaninzi abatsha benkqubo ye-ethylene bongezwe eTshayina, kwaye yonke imithamo emitsha yemveliso ye-PVC eTshayina kwiminyaka yakutshanje yimithamo yemveliso yenkqubo ye-ethylene. Imithamo yemveliso yendlela ye-calcium carbide yaseTshayina iyeke ukuvunywa okutsha. Ke ngoko, kwixesha elizayo, inani lezityalo ze-ethylene eTshayina liya kuqhubeka likhula kwaye inkqubo ye-calcium carbide iya kuqhubeka incipha. Kwixesha elizayo, umthamo wenkqubo ye-ethylene yokuthumela ngaphandle eTshayina uya kuqhubeka ukhula, kwaye kancinci kancinci ube ngumthengisi ophambili wenkqubo ye-ethylene PVC kwihlabathi liphela.
Ixesha lokuthumela: Meyi-07-2022