Problem: Cavity is not filled
Reasons: Melting temperature is too low; injection pressure is too small; gate is too small; hot nozzle is too small; mold temperature is too low; nozzle opening of melt cylinder is too small; hot nozzle is blocked.
Treatment: Increase temperature of hot nozzle and manifold, increase injection pressure, expand gate, increase mold temperature, install a large-size hot nozzle, increase discharge port of melt cylinder, and remove blockage.