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Cold Runner vs. Hot Runner Systems in LSR Injection Molding

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Cold Runner vs. Hot Runner Systems in LSR Injection Molding

04/17/2026

Choosing between cold runner and hot runner systems in Liquid Silicone Rubber (LSR) injection molding significantly impacts material utilization, cycle times, and part quality outcomes. Cold runner systems solidify unused material in channels between shots, requiring post-processing trimming steps that generate scrap waste but offer simplicity in mold design and lower initial investment costs.

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Hot runner systems maintain continuous flow pathways at elevated temperatures, eliminating runner waste entirely while enabling faster cycling through reduced cooling delays. However, these systems demand sophisticated thermal management controls to prevent premature curing within manifolds and require meticulous maintenance schedules to avoid blockages from degraded residues accumulating over prolonged runs.

For high-volume production scenarios involving identical parts, hot runners justify higher capital expenditure through substantial savings in raw material consumption and labor hours spent removing gates manually. Conversely, prototype development or low-volume custom jobs may favor cold runners due to greater flexibility accommodating frequent mold changes without extensive reconfiguration efforts.

Technological advances now offer hybrid approaches combining benefits of both methodologies selectively within same tooling setups. Intelligent valve-gate actuation sequences synchronize opening timings precisely matching cavity-fill dynamics for optimal balance between efficiency gains and process stability assurance. Selecting appropriate runner strategy depends heavily on specific application requirements and economic analyses tailored individual project scopes accordingly.