Chemical blowing special use screw rod of moulding plastics

The utility model belongs to the field of moulding plastics provides a chemical blowing special use screw rod of moulding plastics, include: carrying the melt zone, being equipped with main spiral shell arris and vice spiral shell arris on it, main spiral shell arris sets up with vice spiral shell arris is crisscross, and main spiral shell arris is from carrying melt zone one end to extend to theother end, and the melt zone tip is carried from carrying the melt zone middle part to extend to to vice spiral shell arris, the mixing piece of protective screen, its detachable are connected in carrying melt zone one end, and the mixing piece side intermittent type of protective screen is provided with a plurality of protective screen clearance, round pin nail block, it locates the mixing piecelower extreme of protective screen, non -return valve, it is inserted and locates round pin nail block one end, and non -return valve is used for preventing that the fuse -element is against the current. Compared with the prio