The performance requirements of the dredge gas of the mesh storage bins are high. If the air trapped between the cavity and the parison cannot be completely or quickly discharged, the parison cannot be blown out quickly. After blowing out, the parison cannot be in good contact with the cavity, resulting in rough, dented and other defects on the surface. The surface characters and patterns are not clear enough, affecting the appearance performance and external shape, especially when the parison is extruded, there will be streaks or Melt fracture occurs. It can also prolong the cooling time of the mesh storage bins, reduce its mechanical properties, and cause uneven wall thickness distribution. For this reason, it is necessary to improve the gas dredge performance of the mesh storage bins.