2026-02-18•6 min shoemaking guide•VIESUNCO Materials Science Team

Footwear Foam Troubleshooting: Supercritical TPE Microcellular Foaming on Shrinkage, Voiding & Rebound

Tackling uneven cell sizes and weight variations in supercritical foam midsoles. Practical tuning for injection pressure, mold opening speed, and temperature uniformity.

#Shoe Midsole#Supercritical Foam#Void Defect#Shoemaking#Tuning Guide

Footwear Foam Troubleshooting: Supercritical TPE Microcellular Foaming on Shrinkage, Voiding & Rebound

1. Top 3 Shopfloor Foaming Headaches

Supercritical nitrogen foaming delivers excellent rebound but demands strict temperature and pressure control:

▲ Athletic Running Shoe Midsoles Inspected on Wooden Factory Bench

Surface Orange Peel: Lower barrel nozzle temp by 5°C–8°C to maintain high melt strength.
Weight Variance (>5g): Ensure precise gas dosing backpressure and tight MFI polymer consistency.
Post-Demold Shrinkage: Use shape-holding fixtures and 45°C stress-relief annealing tunnels.

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