An invention patent for a seven‑layer co‑extrusion film blowing unit has recently been published. The technology covers the complete production process, including plasticizing units, filtration devices, bubble‑forming units, folding devices, and winding units. Its core innovation lies in the filtration device, which features an annular groove and a circumferentially arrayed mesh screen structure, enabling reverse flushing of the screens using filtered fluid.
This design saves manual cleaning steps while also preventing contamination of molten raw materials caused by other flushing media adhering to the screens. The technology contributes to improved production quality and efficiency for multi‑layer co‑extruded films, representing continued progress toward greater process refinement in the film blowing sector.
