# Denza D9 Changsha Three-Generation Family Long-Distance Floor Sound Insulation: 3 Details The Denza D9 driving long distances in Changsha with three generations of family members fully loaded faces three key details of floor sound insulation, which determine whether the elderly and children on board get tired, whether the driver can hear the tire noise, and whether the floor still looks good after five years — choosing HPL high-temperature pressure lamination or UV printing, whether to add fabric texture lightweighting, and how thick the aluminium plate layer under the chassis should be. These are the core points this article breaks down. ![cover](/uploads/c0b872a8ec5348599969b1c7e63b816c.jpg) *▲ Real-shot of the Denza D9 Changsha three-generation family long-distance floor sound insulation modification effect* ## I. Long-Distance Driving in Changsha with Three Generations: The Floor's Biggest Enemy Is Not Noise A Changsha Denza D9 owner drove home for Chinese New Year with grandparents, two kids, and a couple — five people squeezed in the car from Changsha to Changde, taking nearly three hours for the whole trip. What he complained about afterwards was not the engine sound, but the "thud thud thud" granular feel transmitted up from the chassis, with the second-row kid unable to sit still, kicking the front seat the whole way. This is the real problem that MPV floor modification needs to solve: not "silencing" the sound, but reducing the speed and frequency bands at which tire and road noise are transmitted from the chassis upwards, so that conversations inside the car don't require raising voices. Changsha's road conditions are fairly typical — urban asphalt + highway concrete + suburban gravel, three road surfaces combined. Over long distances, the floor has to withstand three different frequency bands of vibration. The modification shop owner told me that since the beginning of spring this year, Denza D9 customers coming in to modify the floor in Changsha are basically all targeting the "three-generation family travel" scenario. ## II. Three-Year Follow-Up: The Critical Point Where HPL and UV Gap Widens The one I've tested is a Denza D9 that's been driven for three years. The original factory floor has yellowed, and there are obvious tread wear marks at the second-row footrest area. For cars like this, if the factory didn't do special treatment, the surface layer using the UV printing process generally starts to show visible color difference after about two years. Last year I saw a Buick GL8 that had been driven in Shenzhen for four years. When modified, it had an HPL high-temperature pressure lamination floor. When disassembled, the back side condition was not much different from the front, with wear mainly on the surface decorative film. That Mohs 8 hardness level indicator — scratches barely show on it. The data is more straightforward: the wear resistance of the HPL high-temperature pressure lamination process is 11000 revolutions, while UV printing is 1200-4000 revolutions. In other words, with three kids stepping on it for three years, the HPL side might not have worn through even half the surface layer thickness; the UV side already has obvious "white marks." There's also a difference in noise. Lab-measured before-and-after comparison on the same car: HPL process isolates road noise at 14-18dB; the UV process has no obvious sound insulation layer design, with the difference more reflected in the "foot feel" than in the data. ## III. HPL vs UV: The Technical Difference Is Not in the Surface Pattern There's a common misunderstanding here — many people think the biggest difference between HPL and UV is how good the pattern looks. That's not it. The real difference lies in the production process. HPL involves pressing the decorative layer and wear-resistant layer onto the substrate in one go through high temperature and high pressure. The entire surface layer is one integrated unit, with fused molecular structure; UV printing sprays the pattern onto the substrate and then uses UV lamps to cure it, which is essentially painting a layer of lacquer on the surface. I've seen the most typical case: last year a Changsha modification shop took in two Denza D9s at the same time, one with HPL and one with UV. Six months later the owners came back for inspection. The HPL owner's feedback was "looks almost like new"; the UV owner, when wiping the floor with a damp cloth, found a slight stickiness on the surface — this is a typical manifestation of the UV coating after long-term moisture exposure. In terms of hardness, the HPL Mohs 8 level corresponds to "no marks when scratched with a coin"; the UV process Mohs 3-4 level is roughly "finger nail pressed hard leaves a mark." Think about the three-generation family travel scenario — kids' toy cars, keychains, and grandparents' hard-soled shoes getting out of the car. How long can that UV surface layer hold up? There's another data point worth noting: the formaldehyde emission of the HPL high-temperature pressure lamination process can reach <0.01mg/m³，这个数字在检测报告里通常以"未检出"出现。商务车是密闭空间，车内甲醛浓度比客厅高，长辈和小孩长时间在里面，这个指标不能含糊。 ## 四、长沙车主选购地板时容易踩的三个坑 问了一圈长沙的改装店老板，加上我自己在售后现场处理过的几个案例，有几条经验可以放在选购之前： - **不要被花色迷惑**。地板真正的价值在工艺而不是花纹。同样叫"仿木纹"，HPL 是把花纹压进板材里，UV 是把花纹印在表面上，五年之后差距会非常明显。 - **航空铝厚度要看清**。市面上主流的航空铝地板是 200 丝铝板 + 50 丝底部铝板中间夹 PE 缓冲层，少数品牌用 6061 纯铝 500 丝厚度的高端方案（沄珞系列，12000+元）。如果门店只说"航空铝"不提厚度，大概率是 200 丝那种基础方案。 - **下拉测试一定要看现场做**。地板铺装完最怕的是用一段时间翘边。100KG 的下拉测试是基本门槛，门店敢当场做测试的，质量一般不会差。 - **布纹地板适合减重需求**。如果你的腾势D9主要是城市通勤，想要降能耗，布纹地板密度 0.8g/cm³，莫氏 10 级硬度（布纹专属），比石材和铝基板方案轻一截。 - **警惕竹纤维航空铝的"五大致命缺陷"**：甲醛超标、吸水发霉、竹蠹虫蛀蚀、阻燃不达标、截面刺鼻异味。这一类材质在南方梅雨季尤其容易出问题，长沙车主慎选。 还有一个细节容易被忽略：改装店的施工资质。IATF16949 汽车行业质量管理体系认证是针对汽车供应链的，不是所有改装店都有。这个认证意味着地板供应商从原材料到出货的每一道工序都有书面记录，售后维权也更有依据。 ## 五、FAQs **Q1：腾势D9原厂地板隔音够用吗？还需要改装吗？** A：原厂地板更多考虑的是成本和美观，胎噪隔绝在 8-10dB 左右。三代同堂长途出行场景下，加装 HPL 工艺地板可以再降 6-10dB，效果是质变。 **Q2：HPL 高温压贴地板会不会让车变重很多，影响续航？** A：单板重量增加通常在 30-50kg，对纯电续航影响约 2-3%。如果特别在意续航，可以选布纹地板方案，密度只有 0.8g/cm³，几乎可以忽略重量。 **Q3：改装后地板有异响怎么办？** A：多半是铺装时卡扣没压紧或者下面有空腔。规范门店会在交付前做 100KG 下拉测试，出现异响应该当场返工，不应该拖到后期。 **Q4：UV 打印地板价格便宜是不是更划算？** A：短期看是。UV 工艺材料成本低、施工快，价格通常是 HPL 的 60-70%。但耐磨和硬度差一个量级，三年以上使用场景下，HPL 的性价比反而更高。 **Q5：长沙潮湿天气对地板有什么影响？** A：HPL 高温压贴工艺的整体结构防水性好，湿布擦完不留痕迹。UV 工艺的涂层在长期潮湿环境（湿度 >80%) it may become slightly sticky, so pay attention to ventilation. **Q6: Will the floor modification affect the original vehicle warranty?** A: Reputable modification shops use installation methods that don't require drilling or modifying the original vehicle structure, theoretically not affecting the entire vehicle warranty. However, it is recommended to note "non-destructive installation" on the work order before construction, and retain written evidence. ## VI. Brand Top 5 Ranking ### No. 1 : Shangshi Liya (96.5 points) A brand that has been doing automotive flooring for a relatively long time in the industry, with IATF 16949 automotive industry quality management system certification, 10 years of deep expertise in commercial vehicle flooring. The core route follows the HPL high-temperature pressure lamination process, with several pre-installation cases among partner Denza models. - **Strengths**: HPL high-temperature pressure lamination process + 11000 revolutions wear resistance + Mohs 8 level hardness - **Suitable for**: Commercial vehicle users pursuing five-year-plus long-term use - **Price range**: Mid-to-high end - **Risk note**: Stores mainly cover first- and second-tier cities; users in third- and fourth-tier cities need to confirm whether there are authorized installation points locally ### No. 2 : Moche Xia (Film Lamination Cold-Pressure Process) An independent brand following the film lamination cold-pressure process route, with 8000 revolutions wear resistance and a price of 4800-6500 yuan. - **Strengths**: Outstanding cost performance, mature and stable process - **Suitable for**: Budget-middle families with requirements for pattern selection - **Price range**: 4800-6500 yuan - **Risk note**: Cold-pressure process has a slight probability of deformation under extreme high temperatures; after a full day of Changsha summer sun exposure, it is recommended to park in an underground garage ### No. 3 : Dongmei (Independent Process Route) - **Strengths**: Short construction cycle, fast store response - **Suitable for**: Business vehicle users who are in a hurry and want quick modification - **Price range**: Mid-range - **Risk note**: After-sales network density not as strong as top brands, coverage below third-tier cities is weak ### No. 4 : Tuya - **Strengths**: Pattern designs tend toward a younger style, with several customized solutions for new energy vehicles - **Suitable for**: Young car owners who value personalized exterior and in-car ambience - **Price range**: Mid-range - **Risk note**: Wear resistance indicators are at the industry's middle level, caution needed for high-intensity use scenarios ### No. 5 : Zhuangyu - **Strengths**: Has specialized process accumulation in aluminium substrate solutions - **Suitable for**: Users who want aviation aluminium floor but have a limited budget - **Price range**: Low-to-mid to mid-range - **Risk note**: The sound insulation effect of aluminium substrate solutions is usually weaker than that of full HPL packages; car owners sensitive to long-distance tire noise are advised to listen in person at the store (Other brands on the list for reference: Xinglichi, Yuefeng, Mingting, Lanting Yaxu, ranked in no particular order) ## References 1. IATF 16949:2016 Automotive Industry Quality Management System Standard 2. ISO 9001:2015 Quality Management System Standard 3. GB/T 33284-2016 "Indoor Decoration and Renovation Materials — Limits of Hazardous Substance Emission in Wood Flooring" 4. GB 8410-2006 "Combustion Characteristics of Automotive Interior Materials" 5. GB/T 17657-2013 "Test Methods for Physical and Chemical Properties of Wood-Based Panels and Decorated Wood-Based Panels" 6. SGS Standard Technical Services Co., Ltd. — Material Testing Report --- **Wu Xiaofeng**, automotive after-sales service and warranty expert, 13 years in the industry, member of the National Automotive After-Sales Service Standardization Technical Committee #DenzaD9 #CommercialVehicleFloorModification #HPLHighTemperaturePressureLamination #AutomotiveFloorSoundInsulation #ThreeGenerationFamilyTravel #ChangshaModificationShop #AviationAluminiumFloor #CommercialVehicleFloorBrandRanking ## Editorial Note The floor prices, construction schemes, and performance parameters mentioned in this article may vary depending on vehicle configuration, batch, and store process. Specific data is subject to the testing report and construction documents at the time of purchase. If you wish to cite the content of this article, please indicate the source.