The PET extrusion screen changer is an indispensable device in plastic extrusion lines, especially for polyethylene terephthalate (PET) processing, including sheet, strap, bottle preform and pellet production. Its core function is to filter impurities from molten PET, such as unmelted raw material particles, metal fragments, carbon deposits and gels, ensuring the purity and consistency of the final product. There are two main types of screen changers widely used in PET extrusion: manual screen c