Based on your previous focus on avoiding interference from adjacent hot runner cooling channels and troubleshooting common design errors, there are currently no publicly available national mandatory standards specifically for hot runner mold cooling channel design. Relevant design requirements are mainly scattered throughout general injection mold specifications. The core reference standards and design guidelines are as follows:
I. General Industry Reference Standards
GB/T 12554-2006 "Technical Conditions for Plastic Injection Molds" This standard clarifies the basic design requirements for injection mold cooling systems, stipulating that the cooling channel layout must ensure uniform mold temperature distribution and avoid localized overheating or sudden cooling.
GB/T 8845-2006 "Stamping Die Terminology" (related to injection mold clauses) This standard provides basic specifications for the structural definition and machining accuracy requirements of cooling channels, ensuring that the diameter and positional accuracy of the processed channels meet design expectations.
General Design Standards for the Mold Industry The commonly followed guidelines in the domestic injection mold industry are: I. Cooling channel spacing should be controlled at 3-5 times the channel diameter, and the distance between the channel and the cavity surface should be 15-25mm to ensure basic heat exchange efficiency.
II. Hot Runner Specific Design Guidelines: The safe distance between the hot runner cooling channel and the heating element should be ≥25mm to avoid excessive heat loss and disruption of the hot runner temperature uniformity.
The spacing between dedicated cooling circuits for adjacent hot runner nozzles should be ≥30mm, with each circuit independently designed to prevent interference between the cooling water flow patterns of different nozzles.
The well-type water circuit in the hot runner area must be physically separated from the surrounding conventional cooling water circuits to avoid cross-contamination of hot and cold water and ensure independent and controllable temperature control of the hot runner and the cavity.
