A cold runner injection molding system comprises two or three plates within the mold, facilitating the injection of molten plastic through the sprue and feeding it into the runners that lead to the mold cavity’s parts.
In essence, cold runners are unheated channels and molds responsible for introducing molten plastic into the cavity of a mold tool. They serve as a conduit for the plastic material and help in evenly distributing it throughout the mold, enabling the creation of high-quality plastic parts with precise details and dimensions.
Despite generating some material waste, cold runner systems remain a popular and effective method in injection molding due to their ability to produce intricate and accurate plastic components.
Various approaches, such as recycling and reusing the cold runner material, can be employed to minimize material wastage and optimize cost efficiency in injection molding processes.
I. Introduction II. Cold Runner Systems Two-plate mold Three-plate mold Cold Runner Systems’ Pros and cons: III. Hot Runner Systems The insulated hot runner The insulated hot runner Short Comings The internally heated runner The internally heated runner Short Comings…