Understanding cold runner patterns is an important aspect of mold design. As we learned in the first part of this lesson, the first step in designing a cold runner system is determining optimal gate placement and runner design. In the second part of this lesson we will learn about cavity spacing and runner layout.
The second part of this lesson covers cavity spacing and runner layout. Topics covered include fill patterns and injection pressures for different mold runner layouts, how pressure curves shift based on flow length, how injection pressure is related to runner volumes, and the impact of runner layout on cycle times, cooling behavior, and clamp tonnages.