Three Leading Supercritical Physical Foaming Technologies — How Much Do You Know?!

Three Leading Supercritical Physical Foaming Technologies — How Much Do You Know?!
— A Technical Insight by Kin Join

In today’s fast-evolving world of material science, supercritical physical foaming has emerged as a key technology for achieving lightweight design, high resilience, and eco-friendly manufacturing processes. Are you familiar with these three mainstream methods?
1. ETPU (Expanded Thermoplastic Polyurethane)
Excellent elasticity and outstanding durability! Through a supercritical (such as CO₂ or N₂) physical foaming process, a bead-like material with a popcorn-like structure is created. ETPU delivers superior rebound, lightweight performance, and energy return — widely used in footwear, sports equipment, and industrial cushioning.
2. Supercritical Injection Foaming
Precise and consistent! Supercritical fluid (such as CO₂ or N₂) is introduced into the injection molding machine and mixed with molten polymer. As the material is injected and the pressure drops, the gas expands rapidly to form fine cellular structures. Ideal for complex parts and high-precision products.
3. Supercritical Autoclave Foaming (“Small Becomes Big”)
Plastic components are first molded in smaller sizes and then placed into a high-pressure autoclave for supercritical treatment. The material absorbs gas and expands rapidly, significantly increasing volume — achieving the “small becomes big” effect while reducing material waste and increasing production flexibility.

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Kin Join specializes in the integrated application of polymer materials and innovative processing technologies, committed to delivering the most competitive foaming solutions for our clients.
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三種現行超臨界物理發泡！您了解多少？！
——Kin Join專業技術分享
在材料科技日新月異的今天，超臨界物理發泡技術已成為實現輕量化、高回彈與環保製程的關鍵技術。以下三種主流技術，您是否都了解了呢？
1. ETPU（膨脹熱塑性聚氨酯）
彈性佳、耐久強！透過超臨界（如CO₂或N₂）物理發泡製程，打造出類似「爆米花」結構的顆粒狀材料，具備高回彈、輕量與卓越能量回饋特性，廣泛應用於鞋材、運動用品與工業緩衝材料。
2. 超臨界射出發泡
精準、穩定！將超臨界流體（如CO₂或N₂）導入射出成型機中與熔融塑料混合，再經射出製程快速釋放壓力，使氣體瞬間膨脹產生微細氣泡結構，適用於複雜零件與高精度製品。
3. 高壓釜式超臨界發泡（小發大）
將塑料先行加工成小件後置入高壓釜中進行超臨界處理，使其吸收氣體後快速膨脹。此法能大幅提高體積，達成「小發大」效果，降低材料耗損，提升製程彈性。
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Kin Join專注於高分子材料與創新製程的整合應用，致力為客戶打造最具競爭力的發泡解決方案。
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