A PLASTIC INFILTRATION UNIT, A SYSTEM COMPRISING A PLURALITY OF PLASTIC INFILTRATION UNITS, A METHOD OF MANUFACTURING AN INJECTION MOLDED PLASTIC PILLAR FOR AN INFILTRATION UNIT, A PLASTIC BASE PLATE FOR USE WITH A PLASTIC INFILTRATION UNIT, AND A PLASTIC INFILTRATION SYSTEM FOR DEPLOYMENT UNDERGROUND COMPRISING A PLASTIC INFILTRATION UNIT AND A PLASTIC BASE PLATE

摘要

A plastic infiltration unit pillar (6) has an internal structure comprising a central compartment (8) surrounded, at least in part, by at least one surrounding compartment (10). At least one of the compartments (10) is laterally enclosed. The surrounding compartment (10) has a draft angle extending in one direction and the central compartment (8) has a draft angle extending in a different direction, such as the opposite direction.In a method of manufacturing an injection molded plastic pillar, plastic is injected into a mold for the pillar. The mold comprises a core for the central compartment (8) and a core for the surrounding compartment (10). The core for the at least one surrounding compartment (10) is withdrawn in one direction. The core for the central compartment (8) is withdrawn in a direction different from the one direction.