Deciphering how Teijin developed the world's first polycarbonate car front windshield

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A few days ago, Teijin Co., Ltd. announced that it has developed the world's first polycarbonate (PC) resin pillarless front windshield for GLM's EV sports car "Tommykaira ZZ".

This is also the first time in the world that a resin front windshield is mounted on a commercially available vehicle.

It is understood that the front windshield of the car first needs to ensure the safety of the personnel in the collision, and secondly, it has strict requirements on the transparency and wear resistance of the light.

In addition, the pillar (A-pillar) supporting the structure of the vehicle not only functions to support the front windshield, but also protects the safety of the person inside the vehicle when the vehicle collides. However, if the A-pillar is wider, it will affect the driver's field of vision.

In Japan, the car security standard (road vehicle safety standard) has been revised, and the window of the new model sold in Japan after July this year must be equivalent to the wear resistance of the glass. Under this premise, the front windshield is allowed to be used. PC resin material.

The figure is a comparison of scratches after the PC resin surface abrasion resistance test (1000 rpm). (Left: no coating; center: wet method; right: plasma CVD method)

Plasma CVD Technology

In March of this year, on a PC hardened by wet method, Teijin successfully developed a plasma CVD (Chemical Vapor Deposition) method to add a hard coating to improve PC resin wear resistance and weather resistance technology, and The application of this technology to the windows of large and complex physical vehicles has been successfully achieved through the use of newly developed plasma CVD coating equipment.

The fully transparent PC resin window developed by Teijin has integrated the A-pillar by increasing the thickness of the surrounding area, thus achieving the world's first A-pillar-free design, eliminating factors that hinder the driver's vision and making driving more comfortable.

Compared with a car with a glass window and an A-pillar, the PC resin window can be used to reduce the weight by 36%, which is beneficial to improve the driving performance of the car.

This resin window is suitable for the new safety standards that have been implemented in Japan since July this year, and can achieve the required high wear resistance and weather resistance.

It is understood that GLM plans to obtain a road permit in Japan, and it is expected to add this PC resin window to the optional configuration this fall.

Focus on automotive composites business

In response to the demand for lightweight vehicles, Teijin has been researching and developing lightweight materials for the body. For example, a PC resin which is half the weight of glass and has an impact resistance of 200 times that of glass is used as a glass substitute material, and a solution is provided for a window of a train, a sunroof of a car, a triangular window, and the like.

At the same time, Teijin is not only limited to Japan, but will accelerate its pace to actively explore the US and European automotive markets.

In the “Mid-term Business Plan 2017-2019”, which was implemented this year, Teijin has clearly expanded its composite materials business for the automotive industry with light and strong high-performance materials and composite materials, aiming at providing a lightweight and comprehensive solution for the car body. keep trying.

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