Supercritical Foaming-Based Special Molding

Supercritical Foaming-Based Special Molding

Supercritical foaming is a physical foaming technology that uses supercritical carbon dioxide or nitrogen as a blowing agent in place of organic foaming agents, and is carried out under controlled pressure and temperature conditions [1†L36-L37].

EVA is the earliest, most mature, and most widely used foaming material in footwear applications.

• Density: 0.08-0.12 g/cm³

• Energy return performance up to over 92%

Supercritical foaming materials are used in automotive interiors, rail transportation, and other industries, offering the following unique advantages:

• VOC-free, odor-free — completely eliminates odor issues

• Lightweight — density can be as low as 30 kg/m³, contributing to overall vehicle weight reduction

• Lightweight yet high-strength — overall mechanical properties superior to traditional foaming materials

• Non-crosslinked and recyclable;

• Excellent thermal insulation, shock absorption, waterproofing, and sound insulation properties.

Molding technology is key

• During the molding process, excessively high melt temperature or insufficient mold cooling may lead to cell rupture or surface roughness;

• Mold design and processing parameters (such as injection speed, holding pressure, and holding time) must be carefully controlled to ensure quality.