Isticmaal laba ama in ka badan oo SJZ taxane ah oo mataano ah oo koonka ah si aad u hirgeliso tuubooyin saddex-lakab ah oo PVC ah. Lakabka sandwich ee tuubada waa kalsiyum sare PVC ama PVC xumbo ceeriin.
1. Extruder-ku wuxuu isticmaalaa foosto alloy ah oo u adkeysaneysa xirashada; mataanuhu si siman bay wax u cunaan, budoduna ma xidho;
2. Naqshadaynta la hagaajiyay ee caaryada saddex-lakabka ah ee PVC, kanaalka qulqulka gudaha waa chrome-plated oo aad u dhalaalaya, xirto iyo daxalka u adkaysta; oo leh gacmo gaar ah oo cabbir ah, badeecada tuubada waxay leedahay xawaare sare iyo dusha wanaagsan;