中底踩一个月就塌，回弹跑没了。超临界发泡中底密度没控住，轻弹就是噱头。
中底踩一个月就塌，回弹跑了
超临界发泡中底是“轻弹的件”：回弹、轻量、耐疲劳。材料要回弹好、轻量、耐疲劳——结论先给：超临界发泡中底用 TPU 或 TPE 发泡是主流；
高端定位，PEBA 发泡优先。
超临界发泡中底最大的坑：鞋垫回弹差，脚后跟先抗议。回弹差，脚后跟先知道——回弹，是发泡中底的底线。
超临界发泡中底是功能件：回弹差、塌陷都是问题。材料选对，跑鞋才稳——功能件，别省料钱。
超临界发泡为什么偏向 TPE
超临界发泡中底用 TPE 的理由：回弹可做、轻量可做、耐疲劳、效率高——四条合起来，适合发泡中底。
回弹是核心：发泡中底轻且弹，回弹差走路久了脚后跟酸。回弹测试写进验收——回弹，是发泡中底的底线。
轻量不能省：轻是发泡的意义。密度数据写进验收——超重，就是问题。
跑步轻量疲劳，三道关
跑步工况：反复压缩。回弹数据要验——回弹差，就是问题。
轻量工况：重量敏感。密度数据要验——超重，就是问题。
疲劳工况：长期使用。疲劳数据要验——塌陷，就是问题。
TPE 发泡还是 EVA？一表看清
| 维度 | TPE 发泡 | EVA |
|---|
| 回弹 | 好 | 中 |
| 轻量 | 好 | 好 |
| 耐疲劳 | 好 | 中 |
| 成本 | 高 | 低 |
| 工艺 | 超临界 | 模压 |
| 用途 | 高端 | 常规 |
表格读法：EVA 便宜但回弹差；TPE 发泡回弹好——高端鞋 TPE 发泡，常规 EVA。
按定位选：高端发泡，常规 EVA。
发泡中底验收：回弹轻量两笔账
| 项目 | 方法 | 标准 |
|---|
| 回弹 | 回弹测试 | 按标准 |
| 密度 | 密度杯 | 按目标 |
| 疲劳 | 循环压缩 | 按次数 |
| 泡孔 | 断面观察 | 均匀 |
表格读法：回弹、密度、缓冲四项走完，发泡中底才合格。
回弹，是发泡中底的底线。
只图轻，三个坑塌出来
坑一：只图轻。密度压太低回弹垮掉，脚感马上塌——回弹必测。
坑二：泡孔漏测。泡孔不均——断面观察，必做。
坑三：疲劳漏测。塌陷——疲劳测试，必测。
选中底料先控发泡密度
三问：回弹率多少、密度多少、发泡倍率多少。一验：实际跑步实测——三问一验，供应商底细清楚。
回弹验证要先行：先测落球回弹率，再谈价格——回弹，是发泡中底的底线。
留样要成习惯：每批留样，回弹密度按批次复测。批次换料先对比再放量——批次稳，客诉少。
发泡中底密度做到 0.15-0.25 g/cm³，回弹率要过 60%。 泡孔断面看均匀，泡孔不均局部就塌陷——倍率窗口要锁。
EVA 模压便宜但回弹差，TPE/TPU 超临界发泡回弹好但贵。 高端跑鞋发泡 TPU，常规训练 EVA——按定位选工艺路线。
中底回弹差不是料软，是泡孔不均加倍率飘。 前掌缓震后掌回弹要分区密度，一块料打天下脚感必分层。
发泡中底验收四件套：回弹率、密度、循环压缩 10 万次、泡孔断面。 数据别只报一个回弹率，缓震曲线和能量回归率一起要。
密度 0.20 加回弹 65%、循环压缩过检，中底踩一年还 Q。 每批留样测密度加疲劳，泡孔断面逐批留档对比。
超临界发泡中底常见问题与对策表
| 现象 | 原因 | 对策 |
|---|
| 回弹差 | 发泡不足 | 调倍率 |
| 塌陷 | 耐疲劳弱 | 换耐疲劳料 |
| 泡孔不均 | 工艺不稳 | 调参数 |
| 超重 | 密度高 | 换轻量料 |
| 批次差 | 配方漂移 | 锁窗口 |
超临界发泡中底泡孔直径按 50-150μm 验收，泡孔不均局部就塌。 断面切片看泡孔均匀度，大小差一倍回弹就分层——倍率和温度窗口要一起锁。
中底能量回归率按 60% 以上验收，回弹率高不等于能量回归高。 回弹率是单次弹跳，
能量回归是多次循环衰减——跑鞋中底两个数据都要，别只看回弹。
发泡中底疲劳按 10 万次压缩后高度保持 90% 验收。 中底踩一年塌陷多少，疲劳数据说了算——新中底回弹好不代表十万次后还弹，衰减曲线要测。
超临界发泡温度窗口按 ±2℃ 控制，温度偏一点泡孔就不均。 发泡工艺窗口窄，温度压力时间三个参数联动——别只调一个参数，三个一起锁才稳。
科隆客户案例：交期紧现货对不上，留样数据补认证
沧州一家鞋材厂，超临界发泡中底交期紧，现货牌号性能对不上。科隆配合提供同批次留样与物性数据，通过第三方检测并补齐认证，按期交付。留样加数据，是急单的底气——数据齐，认证快，交期才保得住。
小结
超临界发泡中底的选型，回弹先看，轻量再比，鞋垫回弹差脚后跟先抗议，回弹是底线。
关于我们，四句话：
一、改性热塑性弹性体、改性尼龙（PA6 / PA66 / PA46 / PA11 / PA12 / PA6T / PA9T 及尼龙合金）；
二、改性 PPO / PPS；
三、各大化工巨头尼龙树脂贸易；
四、副牌料、大包料现货。
- 批次：第 12 批｜TS13
- 主关键词：超临界发泡中底；次关键词：超临界发泡材料、发泡中底TPE、中底回弹、中底轻量
- 摘要：超临界发泡中底用什么材料？鞋垫回弹差，脚后跟先抗议。回弹、轻量、选型三张表一次讲清。
- 更新时间：待定
Midsole collapses after just one month of use, and the rebound is gone. Supercritical foam midsoles don't have their density controlled; the light bounce is just a gimmick.
Midsole collapses after just one month, but the rebound runs away
Supercritical foam midsoles are "light bounce pieces": rebound, lightweight, and fatigue-resistant. The material must be reboundable, lightweight, and fatigue-resistant—here's the conclusion first: TPU or TPE foam is mainstream for supercritical foam midsoles;
High-end positioning, PEBA foam is the priority.
The biggest pitfall of supercritical foam midsoles: poor rebound insoles, heel protests first. Poor rebound, heel first knows—rebound is the baseline for foamed midsoles.
Supercritical foam midsoles are functional parts: poor rebound and sagging are problems. Choosing the right materials ensures running shoes are stable—functional parts, don't skimp on material costs.
Why does supercritical foam lean toward TPE ?
Reasons for using TPE for supercritical foam midsoles: reboundable, lightweight, fatigue-resistant, and efficient—all four together, suitable for foamed midsoles.
Rebound is the core: foamed midsoles are light and springy; poor rebound causes heel soreness after walking for a long time. Write rebound tests into acceptance — rebound is the baseline for foam midsoles.
Lightweight, don't skimp: lightness is the meaning of foam. Density data is written into acceptance — overweight is the problem.
Lightweight Fatigue Running, Three Passes
Running Condition: Repeated compression. Rebound data must be verified—poor rebound is the problem.
Lightweight Condition: Weight-sensitive. Density data must be tested—overweight is the problem.
Fatigue Condition: Long-term use. Fatigue data must be tested—collapse is the problem.
TPE Foam or EVA? Clear at the first watch
| Dimension | TPE Foamed | EVA |
|---|
| Rebound | Good | Medium |
| Lightweight | Good | Good |
| Fatigue-resistant | Good | Medium |
| Cost | High | Low |
| Process | Supercritical | Molded |
| Purpose | High-end | Conventional |
Table Reading: EVA is cheap but has poor rebound; TPE foam has good rebound—high-end shoes use TPE foam, while conventional EVA is used
Select by positioning: high-end foam, standard EVA.
Foamed midsole inspection: two calculations for rebound and lightweight
| Project | Method | standard |
|---|
| rebound | Rebound Test | According to the standard |
| Density | Density cup | By target |
| Fatigue | Cyclic compression | By frequency |
| pore | Cross-sectional observation | Even |
Table reading: Only after completing the four items of rebound, density, and cushioning is the foam midsole considered qualified.
Rebound is the bottom line of the foam midsole.
Only aiming for lightness, three holes collapsed.
Pitfall 1: Only aiming for lightness. If the density is too low, the rebound collapses, and the foot immediately feels like it's sinking — rebound must be tested.
Pitfall 2: Undetected blowholes. Uneven blowholes—cross-sectional observation is a must.
Pitfall 3: Fatigue testing omission. Collapse — fatigue testing must be conducted.
Select the base material first to control the foaming density
Three questions: What is the rebound rate, what is the density, and what is the foaming ratio? One test: measured during actual running — three questions and one test, the supplier's details are clear.
Rebound verification must come first: measure the ball rebound rate first, then discuss the price — rebound is the bottom line for foam midsoles.
Making sample retention a habit: retain samples from each batch, and re-measure rebound density by batch. When changing material for a batch, compare first before scaling up — stable batches lead to fewer customer complaints.
The density of the foamed midsole should be between 0.15-0.25 g/cm³, and the rebound rate must exceed 60%. The cross-section of the foam cells should appear uniform; if the cells are uneven, parts will collapse — the magnification window needs to be locked.
EVA molding is cheap but has poor rebound, while TPE/TPU supercritical foaming has good rebound but is expensive. High-end running shoes use foamed TPU, and regular training shoes use EVA — choose the process route according to positioning.
Poor midsole rebound is not due to soft material, but because of uneven foam cells and inconsistent expansion. The forefoot needs cushioning and the rearfoot needs rebound, requiring zoned densities; a single piece of material cannot provide a uniform feel.
Foamed midsole inspection four-piece set: rebound rate, density, 100,000 cycles of compression, and foam cell cross-section. Don't just report a single rebound rate; the cushioning curve and energy return rate should be included together.
Density 0.20, rebound added 65%, cyclic compression tested. The midsole still feels springy after a year of wear. Samples from each batch are kept to test density and fatigue, and the cross-sections of the foam cells are archived for comparison batch by batch.
Table of Common Problems and Countermeasures in Supercritical Foamed Midsoles
| Phenomenon | Causes | Countermeasures |
|---|
| Poor Rebound | Insufficient Foaming | Adjustable Rate |
| Collapse | Weak Fatigue Resistance | Replacing Fatigue-Resistant Material |
| Uneven Bubble Holes | Unstable Process | Parameter adjustment |
| Overweight | High density | Lightweight material replacement |
| Batch difference | Formula drift | Window lock |
Supercritical foam midsole cell diameter is accepted at 50-150μm; uneven foam locally collapses. Cross-sectional slices to check bubble uniformity; if the size differs by one time in rebound, the rebound is layered—the magnification and temperature windows should be locked together.
Midsole energy return rate is accepted at above 60%; a high rebound rate does not mean high energy return. Rebound rate is a single bounce;
energy return is multiple cycles of decay—both data should be used for running shoes, don't just look at rebound.
Foamed midsole fatigue inspection after 100,000 compressions maintains height at 90%. How much the midsole collapses after one year of pressing is determined by fatigue data—a new midsole rebounds well doesn't mean it will bounce again after 100,000 cycles; the attenuation curve needs to be measured.
Supercritical foam temperature window is controlled at ±2°C; if the temperature deviates slightly, the bubbles will be uneven. The foaming process window is narrow, and temperature, pressure, and time are all linked together—don't just adjust one parameter, lock all three together for stability.
Cologne customer case: tight delivery deadline, in-stock does not match, retained sample data for additional certification
Cangzhou shoe material factory, supercritical foamed midsole has tight delivery time, spot grade and performance do not match. Cologne cooperated by providing retained samples and physical property data for the same batch, passed third-party testing and completed certification, and delivered on time. Sample retention plus data is the confidence for urgent orders—complete data, fast certification, and guaranteed delivery time.
Summary
Supercritical foam midsole selection: first check rebound, then compare lightness; insoles with poor rebound protest the heel; rebound is the bottom line.
About us, four sentences:
1. Modified thermoplastic elastomers, modified nylon (PA6 / PA66 / PA46 / PA11 / PA12 / PA6T / PA9T and nylon alloys);
2. Modified PPO / PPS;
3. Major chemical giants in nylon resin trading;
4. Sub-brand materials and large package materials in stock.
- Batch: 12th batch | TS13
- Main Keywords: Supercritical foamed midsole; Secondary Keywords: Supercritical foaming materials, foamed midsole TPE, midsole rebound, midsole lightweight
- Abstract: What materials are used for supercritical foamed midsoles? Poor insole rebound, heel protests first. Three tables explain rebound, lightweight, and selection all at once.
- Update Time: To be determined
