Yog vim li cas rau txheej thiab tev ntawm PVC yeeb nkab fittings: tov nrog lwm yam incompatible polymers; Kev tso tawm ntau dhau yog siv thaum lub sij hawm molding; melting kub nyob rau hauv kab noj hniav yog tsawg heev; noo noo ntau dhau; lub rooj vag thiab cov neeg khiav dej num muaj cov npoo ntse; resin kub inconsistent. Txoj kev txhim kho: Cov khoom no zam cov impurities tsis sib xws lossis cov khoom siv rov ua dua tshiab sib xyaw rau hauv cov khoom siv raw; cov pwm tsim chamfers tag nrho cov neeg khiav dej num lossis rooj vag nrog cov kaum ntse ntse kom ua tiav kev hloov pauv; txheej txheem txheej txheem a. Nce lub chim thiab Pwm kub b. Qhuav cov khoom kom zoo ua ntej molding c. Tsis txhob siv cov pwm tso tawm ntau dhau.
