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High Performance Unfilled Polypropylene Material for Light Weight Interior Trims
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 29, 2022 by SAE International in United States
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Light weighting is important to improve energy efficiency in the automotive industry. In this paper, high performance unfilled polypropylene copolymer (PPCP) material was selected and developed to reduce weight and cost without compromising on functional requirements for interior trims such as door trims, lower pillar trims, scuff trims and rear quarter trims (RQT). Interior trims are loaded with challenging requirements such as stiffness, dimensional stability, haptic feel, scratch resistance, cleanability, thermal stability, toughness, low emission and weathering resistance. Reactor polymerized PPCP material compound met these requirements by having ultra-flow behavior, optimum tensile strength, balanced modulus - impact strength, scratch resistant, low emission and improved thermal properties. This is a ready to mold material used in injection molding process.
This unfilled polypropylene copolymer material has been explored for thin wall interior trims with thickness of 2.5mm. These trims have critical functional requirements such as load versus deflection criteria, push effort to fit the fastener, snap effort with respect to interface bezels and addons, doghouse stiffness, door pull durability, gap and flushes aspects. Structural durability of the design was validated by virtual engineering. Part design and material combinations with better tooling design iterations were analyzed by using mold flow analysis. Complete product performances were being validated for predefined key test metrics such as structural durability, thermal aging, cold impact, scratch resistance and weathering criteria. This part met required specification. The combination of material, optimized part and tool design led to weight savings, good surface quality, dimensional stability under sun load, haptics improvement and considerable cost reduction.
CitationGovindaraj, K., Deoli, M., and Gregory, K., "High Performance Unfilled Polypropylene Material for Light Weight Interior Trims," SAE Technical Paper 2022-01-0338, 2022, https://doi.org/10.4271/2022-01-0338.
- Jo , H. A Study on New Approach of Optimization for the Automotive Plastic Interior Parts SAE Technical Paper 2015-01-0476 https://doi.org/10.4271/2015-01-0476
- Hersman , M.J. Material Options for Automotive Interior Trim SAE Technical Paper 970446 https://doi.org/10.4271/970446
- Naito , M. Trim System for Vehicle Bumpers, Doors and Panels International Body Engineering Conference & Exposition 2003-01-2805 https://doi.org/10.4271/2003-01-2805
- Goldbaum , H.
- Sahoo , M. A Study on Various Structural Concepts of Automotive Door Trim SAE Technical Paper 2017-01-1343 https://doi.org/10.4271/2017-01-1343
- Misra , S.C. Materials For Automotive Interior Door Trim Panels SAE Technical Paper 880338 https://doi.org/10.4271/880338
- Exner-Ewarten , D. Interior trim part, in particular for motor vehicles
- Birka , M.P. Co-injection of molded parts for weight reduction
- Dupont http://www.dupont.co.in/industries/automotive/articles/lightweighting.html