一开风就有股味，比灰尘还难忍。空调风管气味源头在软化油，选错就是败笔。
结论先摆：空调风管，低气味耐温绑一起
空调风管是“吹风的件”：冷风、热风、长期使用。材料要低气味、耐温、不发粘——结论先给：空调风管用低气味 SEBS 基 TPE 是主流；耐温要求高，TPEE 优先。
空调风管最大的坑：气味大的源头，多半是油。风管有味，先查油——油种、油量、油品，是气味的三个开关。
空调风管是功能件：气味大，就是投诉。材料选对，风才干净——功能件，别省料钱。
TPE凭啥没味：低气味可做，耐温可加
空调风管用 TPE 的理由：低气味可做、耐温可做、效率高、成本可控——四条合起来，适合风管。
低气味是核心：风管天天吹风。气味测试（按标准）写进验收——气味大，就是问题。
耐温不能省：冷暖交替。耐温数据按实际温度验——变形，风道就堵。
吹一天考它：风、温差、长时间
吹风工况：长期吹风。气味测试要验——气味大，就是问题。
温度工况：冷热交替。耐温数据要验——变形，就是问题。
时间工况：多年使用。老化数据要验——发粘，就是问题。
TPE还是橡胶：风管上看臭不臭
| 维度 | TPE | 橡胶 |
|---|
| 气味 | 可做低 | 偏高 |
| 耐温 | 可做 | 好 |
| 重量 | 轻 | 重 |
| 成本 | 低 | 中高 |
| 效率 | 挤出 | 硫化 |
| 批次 | 稳 | 波动大 |
表格读法：橡胶耐温好但重、气味偏高；TPE 轻、气味可控——量产件，TPE 是主流。
高温场景 TPEE，常规 TPE——按场景选。
气味来源排查表：油份、助剂、模温
| 环节 | 检查项 | 说明 |
|---|
| 油种 | 石蜡油/环烷油 | 气味差异 |
| 油量 | 充油比例 | 越多越易味 |
| 助剂 | 抗氧/润滑 | 热解气味 |
| 工艺 | 料温 | 过高出味 |
表格读法：气味问题按表排查——油种、油量、油品，一项一项对。
先查油，再查助剂。
两个坑：气味误判、耐温造假
坑一：气味误判。风管有味怪环境，其实是料——先查油。
坑二：耐温虚标。报告写耐温，实际变形——耐温按实测验收。
坑三：发粘忽略。用久发粘——老化测试，必测。
验收三问：气味、耐温、批次
三问：气味按什么标准、油种是什么、耐温按多少度。一验：实际吹风实测——三问一验，供应商底细清楚。
气味验证要先行：气味大的源头，多半是油。先查油，再谈价格——油，是气味的开关。
留样要成习惯：每批留样，气味耐温按批次复测。批次换料先对比再放量——批次稳，客诉少。
气味大先查油，别先骂配方。 料温过高分解出焦味，滞留太久也出味，先油后温最后配方。
新料气味合格，用几个月助剂迁移，味道又上来。 做加速老化后闻气味，新料过关不代表长期过关。
石蜡油和环烷油气味不同，充油越多风险越大。 低味不是少加油一句话，是油种、油量、助剂系统搭出来的。
把清洁方式告诉供应商，按清洁场景推料。 风管内部长期不积灰积水才不发臭，材料配合结构设计。
低味料是风管的“素颜派”：不遮不掩，源头就干净。 油选对、脱挥到位，气味从树脂端就压住。
空调风管常见问题与对策表
| 现象 | 原因 | 对策 |
|---|
| 气味大 | 油种油量 | 换低味配方 |
| 变形 | 耐温不足 | 换耐温料 |
| 发粘 | 助剂迁移 | 换低迁料 |
| 磨花 | 耐磨不足 | 表面处理 |
| 老化味 | 长期迁移 | 换稳定助剂 |
空调风管气味大，源头多半是软化油。 油种一换气味就下来，样件贴鼻闻再加热台烤，挥发分要低。
风管要柔韧弯得动，太硬装不上太扁风阻大。 Shore A 40-50 Q 弹，弯曲半径按设计验。
风管长期走温风，耐温耐老化要验。 热风吹几百小时看发粘硬化，析出就是气味源。
室内件气味是红线，低气味靠源头树脂加脱挥。 别用香精遮，数据随批走，闻着不呛才算过。
风管室内气味是红线，低气味靠源头树脂加脱挥。 别用香精遮，样件加热台闻着不呛才算过。
科隆客户案例：耐磨不合格磨花快，定制牌号返工降半
武汉一家改性料应用厂，空调风管耐磨不合格，表面磨花快。科隆配合定制耐油/耐温专用牌号，返工率降了一半。按工况定制，耐磨才稳——通用料扛不住，就定制。
小结
空调风管的选型，气味先查油，耐温再实测，风管有味，别急着换环境。
总有人问：副牌料到底能不能用。
我们的回答一直没变——能用的地方很多，不能用的地方一处都不能碰。它和回料是两回事：一个是指标偏了，一个是分子链断了。
As soon as the wind blows, there’s a smell, even more unbearable than dust. The source of the odor in the air conditioning duct comes from the softening oil; choosing the wrong one is a blunder.
Conclusion first: air conditioning ducts, low odor and temperature resistant, bind together
Air conditioning ducts are the 'parts that blow air': cold air, hot air, used for a long time. The material should have low odor, be temperature resistant, and not become sticky — conclusion first: for air conditioning ducts, low-odor SEBS-based TPE is mainstream; for high temperature resistance, TPEE is preferred.
The biggest pitfall of air conditioning ducts: the source of strong odors is mostly oil. If the duct smells, first check the oil—the type of oil, the amount of oil, and the quality of the oil are the three switches for the odor.
Air conditioning ducts are functional components: if the smell is strong, there will be complaints. Choose the right materials, and the air will be clean—functional components, don't skimp on material costs.
Why TPE has no odor: low odor is possible, heat resistance can be added
Reasons for using TPE in air conditioning ducts: low odor is feasible, temperature resistance is feasible, high efficiency, controllable cost — together, these four reasons make it suitable for ducts.
Low odor is key: the ducts blow air every day. Odor testing (according to standards) is written into acceptance — if the odor is strong, it's a problem.
Temperature resistance cannot be compromised: alternating between cold and heat. Temperature resistance data should be verified according to the actual temperature—if it deforms, the air duct will be blocked.
Test it by blowing for a day: wind, temperature difference, long time
Blowing condition: long-term blowing. Odor test must be checked — if the smell is strong, there is a problem.
Temperature conditions: alternating hot and cold. Temperature resistance data must be tested—deformation equals a problem.
Time condition: Used for many years. Aging data needs to be checked — stickiness is the problem.
TPE or rubber: check if the duct smells
| Dimension | TPE | Rubber |
|---|
| smell | Can go lower | Slightly high |
| Temperature resistant | Can do | Good |
| Weight | Light | Heavy |
| Cost | Low | Medium-high |
| Efficiency | extrude | Vulcanization |
| Batch | Stable | Highly volatile |
Table interpretation: Rubber has good heat resistance but is heavy and has a strong odor; TPE is light with controllable odor — for mass-produced parts, TPE is the mainstream choice.
High-temperature scenarios TPEE, conventional TPE — choose according to the scenario.
Odor Source Investigation Checklist: Oil, Additives, Mold Temperature
| link; segment; part | Checklist items | Explanation |
|---|
| Oil type | Paraffin oil / Naphthenic oil | Odor difference |
| Oil level | Oil filling ratio | The more, the easier the flavor |
| Additive | Anti-oxidation / Lubrication | Pyrolysis odor |
| Craft | Material temperature | Overly strong flavor |
Table reading method: Check odor problems according to the table—type of oil, oil quantity, oil quality, go through each item one by one.
Check the oil first, then check the additives.
Two pitfalls: misjudging the smell, faking temperature resistance
Pitfall 1: Misjudging odors. If the air duct smells strange, the environment is suspected, but it could actually be the material—check the oil first.
Pitfall 2: False temperature resistance labeling. The report states temperature resistance, but actual deformation occurs — temperature resistance should be accepted based on actual measurement.
Pitfall 3: Neglecting stickiness. Becomes sticky after long use — aging test, must test.
Three acceptance questions: smell, temperature resistance, batch
Three questions: What standard is the smell based on, what type of oil is it, and what temperature resistance is it rated for. One test: actual blow test measurement—three questions and one test, the supplier's background is clear.
Odor verification comes first: sources with strong odors are mostly oil. Check the oil first, then talk about the price—oil is the switch for the odor.
Making sample retention a habit: retain samples from each batch, and re-test the smell and heat resistance batch by batch. When changing materials between batches, compare first before increasing the volume—stable batches result in fewer customer complaints.
If the smell is strong, first check the oil, don't blame the formula first. If the material temperature is too high, it decomposes and produces a burnt smell; if it stays too long, it also gives off a smell. Oil comes first, then temperature, and finally the formula.
The new material's smell is acceptable, but after using additives for a few months, the odor comes back. After accelerated aging and smelling, passing with new material does not mean it will pass in the long term.
Paraffinic oil and naphthenic oil have different smells, and the more oil is added, the greater the risk. Low odor is not simply a matter of adding less oil; it is determined by the type of oil, the amount of oil, and the additive system.
Inform the supplier of the cleaning method and push the materials according to the cleaning scenario. The inside of the air duct will not smell as long as dust and water do not accumulate for a long time, with materials coordinated with structural design.
Low-flavor ingredients are the 'natural look' of air ducts: they neither cover up nor hide, and are clean from the source. Choosing the right oil and proper removal of volatiles keeps the odor suppressed from the resin stage.
Table of Common Problems and Countermeasures of Air Conditioning Ducts
| Phenomenon | Reason | Countermeasure |
|---|
| Strong smell | Oil type and oil quantity | Switch to a lower-flavor formula |
| Transformation | Insufficient temperature resistance | Change to heat-resistant material |
| sticky | Additive migration | Change to low-migration material |
| frosted | Insufficient wear resistance | Surface treatment |
| Aging smell | Long-term migration | Change stabilizer |
The smell from the air conditioner ducts is mostly due to the softening oil. Once the type of oil is changed, the smell decreases. When sample parts are smelled up close and then heated on a baking platform, the volatile content should be low.
The duct needs to be flexible enough to bend; if it's too stiff, it can't be installed, and if it's too flat, it has high air resistance. Shore A 40-50 Q elasticity, bending radius should be verified according to the design.
Air ducts that carry warm air for a long time need to be tested for temperature resistance and aging resistance. Blow hot air for several hundred hours to see if it becomes sticky or hard; any substances that separate out are the source of the odor.
The odor of indoor parts is the red line; low odor is achieved by using source resin with devolatilization. Do not cover it up with fragrance; data follow each batch, and it only counts as passing if it doesn't sting the nose.
The smell in the duct room is the red line; low odor is achieved by adding resin at the source and removing volatiles. Do not use fragrance to mask it; it is only considered acceptable if the sample does not irritate when smelled at the heating station.
Cologne Customer Case: Wear resistance failed, scratching occurs quickly; customized grade reworked at half the quantity
A modified material application factory in Wuhan had issues with air-conditioning ducts being wear-resistant but failing quality tests, with surfaces scratching quickly. Cologne collaborated to customize special grades resistant to oil and temperature, and the rework rate was reduced by half. Customizing according to working conditions is the only way to ensure stable wear resistance—general materials can't handle it, so customization is necessary.
Summary
When selecting air conditioning ducts, first check for oil if there is an odor, then test the temperature resistance practically. If the ducts have a smell, don't rush to change the environment.
There are always people asking: Can substandard materials actually be used?
Our answer has never changed — it can be used in many places, but in places where it cannot be used, it must not be touched at all. It is different from recycled material: one has a deviation in the index, while the other has a broken molecular chain.
