Runner surface nitriding or hard chrome plating treatment to ensure wear resistance and corrosion resistance and prolong the service life of the mould! Tool body made of alloy structure steel 40Cr forging improved the rigidity of the mold. Multi-layer co-extruded composite Distributor, can be of various materials from extruder output, through distributor compound evenly and stable, with the thickness ratio adjusted to realize products of multilayer, multi-colour composite. Divided into A/B, A/B/C, A/B/A, A/B/C/D, A/B/C/A, A/B/C/B/A and many other complex forms. Apply suitable for PP, PE, PET, PS, HIPS, ABS, PC, PMMA, PVC, EVA and other materials.