Njengoko nisazi nonke, ukungunda kweplastiki sisishunqulelo sobumba oludityanisiweyo, olugquma ukubumba koxinzelelo, ukubumba i-extrusion, ukubumba inaliti, ukubumba ukuvuthela kunye nokubumba ugwebu oluphantsi. Utshintsho olulungelelanisiweyo lweconvex yokungunda, ukungunda kweconcave kunye nenkqubo yokubumba encedisayo, sinokuqhuba uthotho lweplastiki p...
Funda ngokugqithisileyo