垫上一周就塌板，脚心发酸。鞋垫回弹和耐晒没选对，天天垫脚天天难受。
鞋垫塌板脚心酸，回弹去哪了
鞋垫是“天天垫脚的件”：回弹、耐晒、吸汗。材料要回弹好、耐晒、吸汗——结论先给：鞋垫用发泡 TPE 是主流；高端鞋垫，TPU 发泡或凝胶复合优先。
鞋垫最大的坑：凉鞋要耐晒，暴晒不变形，选型别省。凉鞋垫晒变形，就是选型省出来的——耐晒，是凉鞋垫的必修课。
鞋垫是体验件：塌陷、变形都是投诉。材料选对，走路才舒服——体验件，别省料钱。
鞋垫为什么用 TPE
鞋垫用 TPE 的理由：回弹可做、耐晒可做、吸汗可做、效率高——四条合起来，适合鞋垫。
回弹是核心：天天垫脚。回弹测试写进验收——塌陷，就是问题。
耐晒不能省：凉鞋暴晒。耐晒测试写进验收——变形，就是问题。
垫脚暴晒吸汗，三道关
垫脚工况：天天垫脚。回弹数据要验——塌陷，就是问题。
暴晒工况：阳台晾晒。耐晒数据要验——变形，就是问题。
吸汗工况：出汗浸湿。耐水数据要验——发硬，就是问题。
TPE 还是 EVA？鞋垫怎么挑
| 维度 | TPE | EVA |
|---|
| 回弹 | 好 | 中 |
| 耐晒 | 好 | 差 |
| 吸汗 | 可做 | 差 |
| 成本 | 中 | 低 |
| 耐用 | 好 | 中 |
| 用途 | 品质款 | 低价款 |
表格读法：EVA 便宜但耐晒差、回弹弱；TPE 回弹耐晒好——品质鞋垫 TPE，低价 EVA。
按定位选：品质 TPE，低价 EVA。
鞋垫验收：回弹耐晒两本账
| 项目 | 方法 | 标准 |
|---|
| 回弹 | 回弹测试 | 按标准 |
| 耐晒 | 老化测试 | 按天数 |
| 吸汗 | 浸水测试 | 按时间 |
| 变形 | 尺寸复测 | 无变形 |
表格读法：UV 老化、回弹、弯折四项走完，暴晒才不变形。
耐晒，是凉鞋垫的必修课。
只图便宜，三个坑垫出来
坑一：只图便宜。凉鞋要耐晒——耐晒必测。
坑二：回弹漏测。塌陷——回弹测试，必测。
坑三：吸汗漏测。发硬——浸水测试，必测。
选鞋垫料先问这三点
三问：回弹率多少、耐晒按多少天、吸汗怎么验。一验：实际穿着实测——三问一验，供应商底细清楚。
耐晒验证要先行：先做紫外老化再看硬度变化，再谈价格——耐晒，是凉鞋垫的必修课。
留样要成习惯：每批留样，回弹耐晒按批次复测。批次换料先对比再放量——批次稳，客诉少。
发泡鞋垫密度做到 0.25-0.35 g/cm³，回弹和轻量才同时成立。 倍率太高太软塌、太低太硬震脚，倍率窗口要锁死。
EVA 鞋垫晒两个月就变形发黄，TPE 发泡耐晒一档。 EVA 抗 UV 弱，阳台晒一周脆化；户外款选 SEBS 基耐候体系。
鞋垫塌陷不是回弹差，是发泡倍率飘了。 同一批密度差 0.05，软硬就分层——先锁密度，再谈回弹率。
鞋垫验收四件套：回弹率、密度、浸水 24h、UV 老化 500h。 四件套全过才放行，缺一项都是半年后的客诉。
倍率锁 0.30 加 UV 500h 过检，鞋垫暴晒不变形、回弹不衰减。 留样每批测密度加回弹，三个月复测手感不分层。
鞋垫常见问题与对策表
| 现象 | 原因 | 对策 |
|---|
| 塌陷 | 回弹不足 | 换高回弹料 |
| 变形 | 耐晒不足 | 换耐晒料 |
| 发硬 | 吸汗不足 | 换耐水料 |
| 色差 | 色粉漂移 | 追色粉 |
| 密度波动 | 发泡不稳 | 锁倍率 |
鞋垫压缩永久变形按 40% 形变 40℃×6h 测，超 25% 一个月就塌。 鞋垫天天踩，压变是寿命的命——新鞋垫软不算，踩一个月还软才算。
鞋垫吸湿排汗按吸水率 <3% 验收，吸了水发胀变形就是客诉。 EVA 鞋垫吸水后变硬，TPE 发泡吸水低一档——汗脚鞋垫吸水率必须测，别只看回弹。
鞋垫表面摩擦按干湿面分别测，汗面摩擦系数不低于干面 70%。 干面滑好不代表汗面滑好——出汗后摩擦系数骤降就是客诉，湿面过了才算数。
鞋垫前掌弯折点对齐跖骨，弯折测试按真实步态角度做。 鞋垫太硬弯折不顺脚，太软支撑不够——弯折角度和位置按足型调，别只看厚度。
科隆客户案例：批次色差被投诉，换体系7天交付
常州一家鞋材厂，鞋垫批次色差明显，成品频繁被投诉。科隆配合换体系换牌号（SEBS 基换 TPV 基），色差稳定，交付周期压缩到 7 天内。体系换了，色差问题从源头断——色差是体系级问题，不是调色能解决的。
小结
鞋垫的选型，耐晒先看，回弹再测，凉鞋要耐晒暴晒不变形，选型别省。
我们站在树脂厂和注塑厂之间。
After just a week, the insole collapsed and the soles of my feet feel sore. I didn't choose the right insole for rebound and sun resistance, and wearing them every day is uncomfortable.
The insole is collapsed and my arch hurts, where did the rebound go?
Insoles are an 'everyday item underfoot': resilient, sun-resistant, and sweat-absorbent. The material should be resilient, sun-resistant, and sweat-absorbent — conclusion first: foamed TPE is mainstream for insoles; for high-end insoles, foamed TPU or gel composites are preferred.
The biggest pit of insoles: Sandals need to be sun-resistant, and should not deform under intense sunlight; don't skimp on choosing the right type. Insoles that deform from sun exposure are a result of skimping on the type—sun resistance is a required lesson for sandals.
Insoles are the experience part: sagging and deformation lead to complaints. Choosing the right material makes walking comfortable—since it's the experience part, don't skimp on material costs.
Why use TPE for insoles
Reasons for using TPE in insoles: can provide rebound, can be sun-resistant, can absorb sweat, high efficiency — all four together make it suitable for insoles.
Rebound is key: stand on tiptoe every day. Write the rebound test into the acceptance criteria — collapse is a problem.
Sun resistance cannot be compromised: sandals under strong sunlight. Include sun resistance testing in the inspection—if it deforms, that's a problem.
Standing on tiptoe in the scorching sun to absorb sweat, three hurdles
Tiptoe condition: tiptoe every day. Rebound data must be checked—collapse is a problem.
Exposure to strong sunlight conditions: drying on the balcony. Sunlight resistance data must be verified—deformation equals a problem.
Sweat absorption condition: soaked with sweat. Water resistance data needs to be tested—if it hardens, that's a problem.
TPE or EVA? How to choose insoles
| Dimension | TPE | EVA |
|---|
| rebound | Good | middle |
| Sun-resistant | Good | poor |
| Absorb sweat | Can do | poor |
| Cost | middle | Low |
| Durable | Good | middle |
| Purpose | Quality model | Low-priced model |
Table reading: EVA is cheap but has poor sun resistance and weak rebound; TPE has good rebound and sun resistance — quality insoles use TPE, low-priced ones use EVA.
Choose according to positioning: quality TPE, low-cost EVA.
Insole Acceptance: Two Sets of Accounts for Resilience and Sunlight Resistance
| Project | Method | standard |
|---|
| rebound | Rebound Test | According to the standard |
| Sun-resistant | Aging Test | By day |
| Absorb sweat | Water immersion test | By time |
| Transformation | Size remeasurement | No deformation |
Table reading: After completing the four items of UV aging, rebound, bending, it won't deform under exposure to sunlight.
Sun resistance is a required course for sandal insoles.
Only looking for cheapness, ended up with three problems.
Pitfall 1: Only looking for cheap options. Sandals need to be sun-resistant — sun resistance must be tested.
Pitfall 2: Rebound testing omission. Subsidence — rebound testing is mandatory.
Pitfall 3: Sweat absorption testing failure. Hardening — water immersion test, must be tested.
Ask these three questions first when choosing insole materials
Three questions: What is the rebound rate, how many days of sun resistance, and how to test sweat absorption. One test: actual wear test—three questions and one test, the supplier's details are clear.
Sun resistance verification must come first: first conduct UV aging tests, then look at hardness changes, and only then discuss price—sun resistance is a required course for sandal insoles.
Making sample retention a habit: retain samples for each batch, and re-test rebound and sun resistance by batch. When changing materials for a batch, compare first before mass production—stable batches mean fewer customer complaints.
Foamed insoles need a density of 0.25-0.35 g/cm³ for both resilience and lightness to be achieved. If the rebound ratio is too high, it's too soft and collapses; if too low, it's too hard and shocks the foot. The ratio window must be fixed.
EVA insoles deform and turn yellow after being exposed to sunlight for two months, while TPE foam has moderate sun resistance. EVA has weak UV resistance and becomes brittle after a week on the balcony; outdoor models should choose SEBS-based weather-resistant systems.
The collapse of the insole is not due to poor rebound, but because the foaming ratio fluctuated. In the same batch, a density difference of 0.05 will cause the hardness to layer—first lock in the density, then talk about the rebound rate.
Insole inspection four-piece set: rebound rate, density, 24-hour water immersion, 500-hour UV aging. All four items must pass before release; missing any one will result in customer complaints six months later.
Magnification lock 0.30 plus UV 500h passed inspection, insoles do not deform or lose resilience after sun exposure. Samples from each batch are tested for density and resilience, and the feel is retested after three months without delamination.
Common Problems and Solutions Table for Insoles
| Phenomenon | Reason | Countermeasure |
|---|
| collapse | Insufficient rebound | Replace with high-rebound material |
| Transformation | Insufficient sun resistance | Change to sunscreen-resistant material |
| become hard | Insufficient sweating | Change to waterproof material |
| Color difference | Color powder drift | Color chasing powder |
| Density fluctuation | Foaming instability | Lock ratio |
Insole compression permanently deforms; tested at 40% deformation, 40℃×6h, if it exceeds 25%, it will collapse in a month. Insoles are stepped on every day, and compression deformation determines their lifespan—new insoles being soft doesn't count, they only count as soft if they are still soft after a month of use.
Insoles are checked for moisture absorption and sweat wicking according to a water absorption rate of <3%; if they swell and deform after absorbing water, it's considered a customer complaint. EVA insoles harden after absorbing water, and TPE foam has a lower water absorption rate — the water absorption rate of insoles for sweaty feet must be measured, don’t just look at rebound.
The friction of the insole surface is measured separately for dry and wet surfaces. The friction coefficient on sweaty surfaces should not be less than 70% of that on dry surfaces. Good slip resistance on dry surfaces does not mean good slip resistance on sweaty surfaces — a sudden drop in friction coefficient after sweating leads to complaints, and only passing the wet surface test counts.
The forefoot bending point of the insole should align with the metatarsals, and the bending test should be done according to the angles of an actual gait. If the insole is too hard, bending will be uncomfortable; if it is too soft, support will be insufficient—the bending angle and position should be adjusted according to the foot shape, not just based on thickness.
Cologne Customer Case: Batch Color Difference Complained, System Change Delivered in 7 Days
A shoe material factory in Changzhou had noticeable color differences in batches of insoles, and the finished products were frequently complained about. Kolon coordinated a system and grade replacement (from SEBS-based to TPV-based), resulting in stable color differences and a delivery cycle compressed to within 7 days. With the system changed, the color difference problem was eliminated at the source — color differences are a system-level issue, not something that can be solved by color matching.
Summary
When choosing insoles, check sun resistance first, then test rebound. Sandals must be resistant to sun exposure and not deform under strong sunlight, so don’t skimp on choosing the type.
We are standing between the resin factory and the injection molding factory.
