Pankhani yopanga mapaipi apamwamba kwambiri a polyethylene (PE), kulondola komanso kusasinthasintha ndikofunikira. Chida chimodzi chofunikira chomwe chimatsimikizira mawonekedwe ndi kukula kwake kwa mapaipi a PE panthawi yopanga ndi thanki ya PE vacuum calibration tank. Munkhaniyi, tiwona zofunikira za PE ...