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Case study

Shift brilliance: Light Design = new chrome in car interiors

VW’s effort to introduce light design enhanced IP trim elements, a departure from conventional standard trims, to its Tiguan model. Possible through the adoption of In-Mold Decoration technology and material innovation of Covestro, leveraging high-purity Makrolon® Ai Polycarbonate.
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Task

Transforming IP look and feel of the new Tiguan

The injection molding of several interconnected IP trim parts, some of which are sizeable and span seamlessly btw door panels to encompass the entire dashboard. 

The primary objective is to achieve a visually stunning interior light enhanced trim system that transforms the in-cabin experience.

One key goal is to ensure the homogeneous distribution of light throughout interconnected IP trim parts.

The third generation of the VW Tiguan has been redesigned and in all areas improved

The interior of the Tiguan features a completely new concept and design. It stands out with its high standards of material and workmanship. In addition, the new cockpit landscape is intuitive to use, closely integrated, and has a clean and smart design

As quoted on volkswagen-newsroom.com

Challenge

Crafting a solution: for a injection-molded IP trim part

This challenge involves injection molding a large automotive part using two-cavity In-Mold Decoration (IMD) equipment. It requires precision to meet tight tolerances, ensure dimensional accuracy, achieve balanced ambient light dispersion, make lighting energy-efficient and sustainable, and create a vibrant appearance day and night. The goal is to convince VW to adopt Makrolon® Ai diffusion-grade material, demonstrating its global potential across multiple car models.

The choice of high-purity optical Makrolon Ai plus color is absolutely paramount. Not only to shape aesthetics but also to influence the overall perception of quality and innovation. The ability to achieve a high-quality look and feel in ambient light trim elements is a defining factor in setting EVs apart from the crowd.

Ciro Piermatteo

Global Technical Marketing Manager “Interior”, Covestro Engineering Plastics - Mobility, Covestro Deutschland AG

Solution

Clever Makrolon® Ai Diffusion concealing LED Hot Spots

Our solution uses Makrolon® Ai, a diffusion polycarbonate known for high purity, concealing LED hotspots while meeting mechanical standards. It ensures smooth light distribution, ideal for automotive interiors, with excellent mold flow, thin-wall design fit, and optimal light transmission. We supported VW in grade selection, color matching, and molding trials, boosting manufacturing efficiency and quality. This collaboration reflects our commitment to tailored solutions that meet industry needs.

We are excited about the successful collaboration with VW Group Components, committed to continue our partnership exploring further developments and thus create value for the world of High Performance Polycarbonate.

Konstantin Leonhardt

Global Key Account Manager VW Group, Covestro Engineering Plastics – Mobility, Covestro Deutschland AG

Key Benefits

  • “Light transmission" PC’s inherent properties Selecting Covestro’s polycarbonate enabled light as a functional interior element.
  • “Aesthetic appeal” Seamlessly blending light with IMD unlocks unique effects, enhancing interior appeal.
  • Light diffusion quality Covestro’s polycarbonate enables balanced, consistent light for a harmonious interior ambiance.

Automotive Interior Dynamic Lighting Webinar

How the combination of high purity polycarbonate with genuin materials evolves car interior dynamic lighting aesthetically.

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