Q: why does the glue inlet of PS material in hot runner mold stick???

A: if it is an old mold, it may be that the heat pipe of the hot runner is broken. Find an electrician to solve it. Fly the new mold to see whether the pump nozzle is vertical, whether there is any chamfer that is not avoided, whether the hot runner is not installed properly, and whether the glue inlet is deformed by the nozzle. If these are eliminated, it is that the internal water inlet is too small and the glue injection pressure is excessive. There's only these on the mold. If the beer maker is inexperienced, the nozzle temperature is not adjusted properly