Tilmaamo kala duwan iyo moodooyinka PVC twin-screw extruder waxay soo saari karaan tuubooyinka dhexroorka kala duwan iyo dhumucda derbiyada kala duwan. Qaab dhismeed si gaar ah loo nashqadeeyay oo leh balaastiig isku mid ah iyo wax soo saar sare. Caaryada soo saarista oo ka samaysan bir tayo sare leh oo tayo sare leh, dahaarka kanaalka qulqulka gudaha ee chrome, daawaynta dhalaalaysa, xidhashada iyo iska caabinta daxalka; oo leh gacmo-xawaaraha sare ee u go'an, tayada dusha tuubooyinka ayaa wanaagsan. Gooyaha gaarka ah ee tuubada PVC wuxuu qaataa qalabka isku dhafka ah ee wareega, kaas oo aan u baahnayn in lagu beddelo dhexroorka tuubooyinka kala duwan. Iyada oo leh qalab wax-ku-saarid, goyn, farsamayn, qaabayn hal-tallaabo ah. Taageer mashiinka gambaleelka khadka tooska ah ee ikhtiyaarka ah.