PVC chingwe zinthu amapangidwa polyvinyl kolorayidi monga maziko utomoni, kuwonjezera stabilizers, lubricant ndi organic fillers, etc., kudzera kusakaniza, kukanda ndi extrusion.Ngakhale kuti ntchito yake yapakati ndiyabwino kwambiri komanso siyokonda zachilengedwe, mtengo wake ndi wotsika ndipo njira yake ndi ...
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