Generally, modified polypropylene (P P) is selected as the material, which is composed of PP (about 60%), rubber (about 30%), filler (talc) about 9%, and additive (antioxidant, preservative, nucleating agent, anti ultraviolet agent, etc.) 1%. The material is resistant to low temperature impact (- 30 ℃, Izod impact strength is 6.0kg.cm/cm), with high fluidity and good sealing performance of coating (corresponding to E-10).

此外，該材料具有良好的外觀質量，能夠滿足細熔合晶粒、良好的表面張力和無熔合晶粒的A級表面的要求。材料是可回收的，100%可回收。

In addition, the material has good appearance quality and can meet the requirements of fine fusion grain, good surface tension and A-class surface without fusion grain. The material is recyclable, 100% recyclable.

在產品設計階段，利用MOLDFLOW軟件對設計進行CAE分析，進行技術生產驗證。分析內容包括:膠點位置、膠點尺寸、產品重量、鎖模力、產品充裝模擬、流場溫度、充裝壓力、剪應力、收縮率、氣體滯留位置、焊縫、翹曲、冷卻液溫度、零件溫度。通過CAE分析，我們可以在設計階段對產品的不良情況進行調整和預防，從而保證產品的順利成型。

In the product design stage, use Moldflow software to carry out CAE analysis of the design and technical production verification. The analysis contents include: glue point position, glue point size, product weight, mold locking force, product filling simulation, flow field temperature, filling pressure, shear stress, shrinkage, gas retention position, weld, warpage, coolant temperature and maximum temperature of parts. Through CAE analysis, we can adjust and prevent the bad situation of the product in the design stage, so as to ensure the smooth formation of the product.

值得一提的是，保險杠并不是“等肉厚”設計，而是根據產品的不同部位需要進行“肉厚變化”，變化范圍為2.6-3.4mm。一般原理是:中間部分屬于厚肉區，膠嘴的遠端為薄肉區，產品的匯合處為薄肉區。

It is worth mentioning that the bumper is not designed as "equal meat thickness", but "meat thickness change" according to different parts of the product, with the change range of 2.6-3.4mm. The general principle is: the middle part belongs to the thick meat area, the distal end of the glue mouth is the thin meat area, and the confluence of the products is the thin meat area.

通過本產品的肉厚梯度技術，可以實現以下功能:注塑口少，一般為2~4個噴嘴，所以模具簡單，成本相對較低;快速成型可以實現，因為橡膠嘴的遠端是一個瘦肉區域，容易實現產品的填充;通過計算等厚度保險杠的重量與等厚度保險杠的重量相差約15%，可以節約注塑材料。

Through the meat thickness gradient technology of the product, the following functions can be realized: less injection ports, generally 2-4 nozzles, so the mold is simple and the cost is relatively low; rapid prototyping can be realized, because the far end of the rubber nozzle is a lean meat area, which is easy to realize the filling of the product; By calculating the difference between the weight of equal thickness bumper and that of equal thickness bumper by about 15%, the injection material can be saved.