Day July 8, 2026

If you run a plastic monofilament extrusion line long enough, you learn a slightly annoying truth: the line can look identical on paper, but it behaves like a different machine when you switch polymers. PET, PA (nylon), PP, and HDPE can…

If you’re running PET zipper monofilament and fighting frequent breaks, it’s tempting to start turning knobs—draw ratio, winder tension, water temperature—until something “seems better.” That approach usually costs time and material because breaks are often a downstream symptom of an upstream instability.…