包胶件一撕就开，二次成型全废。料和工艺是一张卷，两头都得答。
一撕就脱层，基材和料没配成对
TPE包胶注塑（二次注塑），料和工艺是一张卷子：基材、料、参数。结论先给：包胶脱层，先查基材——基材，是包胶的地基。
TPE包胶注塑最大的坑：料和工艺，是一张卷子。料对了工艺不对，照样脱层——料和工艺，是包胶的两张卷。
TPE包胶是工艺活：脱层、开裂都是问题。工艺对了，良率才稳——工艺活，别省步骤。
基材决定粘不粘，为什么先看骨架
TPE 包胶靠基材极性：PP 用 SEBS 基，PA 用 TPEE。基材不匹配，脱层跑不了——基材，是包胶的地基。
基材表面要处理：清洁、除尘、除油。基材不净，粘接白搭——基材清洁，是包胶的头一步。
包胶温度要配合：料温 180-210℃。模温 40-60℃——温度，是包胶的粘接线。
备料、注塑、冷却，流程怎么走
备料：基材预成型，表面处理。基材不净，脱层——备料，是包胶的起点。
注塑：一次注塑基材，二次注塑包胶。两段温度分别调——注塑，是包胶的核心。
冷却：保压冷却到位。冷却不足，粘模——冷却，是包胶的收尾。
SEBS基对阵TPEE，包胶选谁
| 基材 | 包胶料 | 温度 |
|---|
| PP | SEBS基 | 180-200℃ |
| ABS | SEBS基 | 190-210℃ |
| PA | TPEE | 210-230℃ |
| PC | TPU | 200-220℃ |
表格读法：基材配体系，温度跟着走——PP 用 SEBS 基，PA 用 TPEE。
按基材配，包胶才不脱。
剥不开不脱层，先核这四项
| 项目 | 要求 | 判断 |
|---|
| 基材 | 清洁 | 达标 |
| 料温 | 按体系 | 达标 |
| 模温 | 按体系 | 达标 |
| 剥离力 | 实测 | 达标 |
表格读法：基材、温度、剥离力逐项对，料对了工艺不对照样脱层——包胶好不好，两头都要答题。
料和工艺，是包胶的两张卷。
脱层就怪料，基材表面没人查
坑一：只换料。一脱层就退软胶，温度和基材没对上——二次注塑脱层，先把工艺和料摆一张桌上。
坑二：基材不净。脱层——基材清洁必做。
坑三：温度乱调。脱层——温度按体系调。
基材、剥离、工艺——包胶前问清
三问：什么基材、什么体系、剥离力多少。一验：试模剥离实测——三问一验，供应商底细清楚。
基材验证要先行：先核基材极性和表面处理，再对料温和冷却。先查基材，再谈良率——基材，是包胶的地基。
留样要成习惯：每批留样，粘接按批次复测。批次换料先对比再放量——批次稳，客诉少。
脱层、飞边、缺胶：故障对照一张表
| 现象 | 原因 | 对策 |
|---|
| 脱层 | 基材不净 | 清洁基材 |
| 脱层 | 温度低 | 升温 |
| 开裂 | 料不匹配 | 换料 |
| 缩水 | 保压低 | 加保压 |
| 银纹 | 水分多 | 加烘料 |
包胶剥离力低于0.5kN/m别量产，用两周就开胶。 PP基材SEBS体系典型1.0-2.0kN/m；包胶厚度0.8-1.5mm，太薄粘不牢太厚浪费。
包胶脱层先别怪胶水——基材极性不匹配，胶水再多也没用。 水分是脱层帮凶，包胶料烘到位；料和工艺是一张卷子，两头一起核。
包胶验收三步：先测剥离力，再弯折5000次，最后过湿冷热循环。 包胶温度按体系调，基材批次锁死；换料先小批试产过三关。
包胶就是“软皮包硬骨”——基材是骨，软胶是皮，剥离力是皮骨粘合力。 软胶从壳上整圈翘起，多半剥离力不够；模温不够粘接差一截。
剥离力从0.3提到1.8kN/m，弯折5000次零脱胶。 基材换批先对比再放量；包胶参数记录归档，追溯有据。
包胶是软皮包硬骨，先粘不粘得住，看基材极性再选 TPE 体系。 PP 基材配 SEBS 基剥离力典型 1.0-2.0kN/m，ABS 配 SBS 基；基材表面要干净，模温影响剥离，剥离力低于 0.5kN/m 别量产。
二次注塑先打样三样：剥离力报告、弯折次数、耐温，缺一样不谈量产。
包胶件弯折五千次零脱胶才稳；换料先小批五百件过外观手感寿命三关，基材预热到位再谈放量。
包胶收尾验收：剥离力、弯折、耐温三样随批走，缺样不谈量产。
每批留样测剥离力 1.0-2.0kN/m，弯折五千次零脱胶；批次换料先小批五百件过三关，再谈放量。
包胶选型说到底，是把基材极性、剥离力、弯折寿命三件事一次问清。
基材定体系，剥离力 1.0-2.0kN/m，弯折五千次不脱胶；先打样三样齐，缺一样不谈量产。
包胶牢不牢，弯折五千次一弯便知。 脱胶就不合格，剥离力数据随批走；基材预热到位，再谈放量。
科隆客户案例：包胶批量脱层，跟产对标复现
佛山一家注塑加工厂，TPE 包胶件批量脱层，返工率居高不下。科隆配合现场跟产调试到良率稳定，脱层消除，手感回弹对标样品复现。跟产调试，把脱层锁死在量产前——包胶问题，先看基材再看参数。
小结
TPE包胶注塑的工艺，基材先查，温度再调，料和工艺是一张卷子，基材是地基。
我们交付的，不只是一包料。
The overmolded parts come apart as soon as you peel them, and the second molding is all wasted. The material and process are two sides of the same coin, and both need to be addressed.
It peels off in layers as soon as you tear it; the substrate and material were not properly matched.
TPE overmolding injection (secondary injection molding), the material and process are on one sheet: substrate, material, parameters. Here’s the conclusion first: for overmolding delamination, check the substrate first — the substrate is the foundation for overmolding.
The biggest pitfalls in TPE overmolding: material and process, it's like a test paper. Even if the material is right, if the process is wrong, delamination still occurs — material and process are the two test papers of overmolding.
TPE coating is a craft: delamination and cracking are problems. Only with the right process can the yield be stable—it's a craft, don't skip steps.
The substrate determines whether it sticks or not, so why look at the framework first
TPE coating depends on the polarity of the substrate: PP uses SEBS base, PA uses TPEE. If the substrate doesn't match, delamination is inevitable—the substrate is the foundation of the coating.
The substrate surface must be treated: cleaned, dust removed, and degreased. If the substrate is not clean, bonding is pointless — substrate cleaning is the first step in coating.
The coating temperature should match: material temperature 180-210℃. Mold temperature 40-60℃ — temperature is the bonding line of the coating.
Material preparation, injection molding, cooling—what is the process flow?
Material preparation: Pre-form the substrate and perform surface treatment. If the substrate is not clean, it will delaminate—material preparation is the starting point for encapsulation.
Injection molding: first injection molding the substrate, then second injection molding to overmold. The temperatures for the two stages are adjusted separately — injection molding is the core of overmolding.
Cooling: Maintain pressure and cool in place. Insufficient cooling can cause sticking to the mold—cooling is the finishing step of encapsulation.
SEBS vs TPEE, which one to choose for overmolding
| Substrate | Encapsulation material | Temperature |
|---|
| PP | SEBS-based | 180-200℃ |
| ABS | SEBS-based | 190-210℃ |
| PA | TPEE | 210-230℃ |
| PC | TPU | 200-220℃ |
Table reading: The substrate matches the system, and the temperature follows—PP uses an SEBS base, PA uses TPEE.
Match the base material, and the coating will not peel off.
If it can't be peeled off or delaminated, first check these four items
| Project | Requirement | Judgment |
|---|
| Substrate | Clean | Meet the standard |
| Material temperature | According to the system | Meet the standard |
| Mold temperature | According to the system | Meet the standard |
| Peel strength | Actual measurement | Meet the standard |
Table reading method: Match the substrate, temperature, and peel strength item by item; even if the materials match, if the process is wrong, delamination still occurs—whether the encapsulation is good or not, both ends need to answer the question.
Material and craftsmanship are the two aspects of encapsulation.
Delamination is blamed on the material; no one checked the surface of the substrate.
Pitfall 1: Only changing the material. As soon as delamination occurs, they return the soft glue, but the temperature and substrate aren't matched—when delamination happens during secondary injection molding, first lay out the process and the materials on the table.
Pitfall 2: The substrate is not clean. Delamination — substrate cleaning is a must.
Pitfall Three: Random temperature adjustments. Delamination — adjust the temperature according to the system.
Substrate, peeling, process—ask clearly before coating
Three questions: what substrate, what system, how much peel strength. One check: actual measurement of mold peel—three questions and one check, supplier details clear.
Substrate verification must come first: first check the substrate polarity and surface treatment, then the material temperature and cooling. First check the substrate, then discuss yield — the substrate is the foundation of encapsulation.
Make sample keeping a habit: keep a sample for each batch, and retest the bonding by batch. When changing materials between batches, compare first before scaling up—the batch is stable, and customer complaints are few.
Delamination, Flash, Missing Glue: A Comparison Table of Faults
| Phenomenon | Reason | Countermeasure |
|---|
| Delamination | Unclean substrate | Clean the substrate |
| Delamination | Low temperature | Temperature rise |
| Cracking | Material mismatch | Material change |
| shrink | Low hold pressure | Increase pressure |
| Silver streak | Moist | Add roasting material |
Do not mass-produce if the coating peeling strength is below 0.5 kN/m, it will start peeling after two weeks. For PP substrate SEBS system, the typical value is 1.0-2.0 kN/m; coating thickness should be 0.8-1.5 mm, too thin it won't stick well, too thick is wasteful.
Don't blame the glue first for delamination of the coated rubber—if the substrate polarity doesn't match, no amount of glue will help. Moisture is an accomplice in delamination, so the coating material should be properly baked; the material and the process are part of the same sheet, and both ends should be checked together.
Three steps for jacketed material acceptance: first measure peel strength, then bend 5,000 times, and finally pass wet and dry thermal cycles. The jacketed material temperature is adjusted according to the system, and the substrate batch is locked; when changing materials, first run a small batch trial production to pass the three checks.
Overmolding is 'soft skin over hard bone' — the substrate is the bone, the soft rubber is the skin, and the peel strength is the adhesion between skin and bone. When the soft rubber peels off around the whole shell, it is mostly due to insufficient peel strength; if the mold temperature is insufficient, the bonding is inferior.
Peeling force increased from 0.3 to 1.8 kN/m, no delamination after 5000 bends. When changing the batch of the substrate, compare first before scaling up; encapsulation parameters are recorded and archived for traceable reference.
Overmolding is soft material covering a hard core. First, check if it can stick; choose the TPE system according to the polarity of the substrate. For PP substrates with SEBS base, the typical peel strength is 1.0-2.0 kN/m; for ABS with SBS base. The substrate surface must be clean, and mold temperature affects peeling. Do not mass-produce if the peel strength is below 0.5 kN/m.
For secondary injection molding, first produce three samples for testing: peel strength report, bending cycles, and temperature resistance. Without any one of them, mass production will not be considered.
The overmolded parts can withstand bending five thousand times without delaminating before being considered stable; when changing materials, first run a small batch of 500 pieces to pass the three tests of appearance, feel, and durability, and only discuss mass production after the substrate is properly preheated.
Overmolding finishing acceptance: Peel strength, bending, and temperature resistance are checked with each batch; no production will be discussed if any sample is missing.
The peel strength of samples from each batch is 1.0-2.0 kN/m, and there is no delamination after 5,000 bending cycles; for batch material changes, first pass 500 pieces of a small batch through three inspections before discussing large-scale production.
When it comes to choosing the coating, it ultimately comes down to asking about the substrate polarity, peel strength, and bending lifespan all at once.
Base material system, peeling force 1.0-2.0 kN/m, does not delaminate after five thousand bends; first make three samples, all three must be complete, if one is missing, mass production will not be discussed.
Whether the coating sticks firmly or not can be known after bending it five thousand times once. If it peels off, it’s not up to standard, and the peel strength data follows each batch; only when the substrate is properly preheated can we talk about mass production.
Cologne Customer Case: Bulk delamination of overmolding, replicated according to production benchmarks
A plastic injection factory in Foshan experienced batch delamination of TPE overmolded parts, resulting in a persistently high rework rate. Cologne assisted on-site with production debugging until the yield stabilized, delamination was eliminated, and the touch and rebound matched the reference samples. Through production debugging, delamination was locked out before mass production—overmolding issues should first examine the substrate, then the parameters.
Summary
For the TPE overmolding injection process, first check the substrate, then adjust the temperature. Material and process form a single system, and the substrate is the foundation.
What we deliver is more than just a bag of material.
