Pilot project started: Faulty car glass to be turned into new windowpanes for the Audi Q4 e-tron

Pilot project started: Faulty car glass to be turned into new windowpanes for the Audi Q4 e-tron

25.04.2022: One-year pilot operation of glass recycling: joint project between Audi, Reiling, Saint-Gobain Glass, and Saint-Gobain Sekurit started in January Feasibility of a glass cycle for car windows: research on recycling methods, quality, and process r

One-year pilot operation of glass recycling: joint project between Audi, Reiling, Saint-Gobain Glass, and Saint-Gobain Sekurit started in January
    
   
Feasibility of a glass cycle for car windows: research on recycling methods, quality, and process reliability
    
   
Recycled plate glass is intended to be used for car windows in the Audi Q4 e-tron series




Faulty car windows often go in the recycling bin when the cracked part cannot be fixed. A closed material circuit does not yet exist for damaged car glass. This is where Audi and its partner companies Reiling Glas Recycling, Saint-Gobain Glass, and Saint-Gobain Sekurit are now doing pioneering work as part of a joint pilot project.



The partner companies want to turn the damaged auto glass into recyclable material for model production and have drawn up a multi-stage process for that purpose: using an innovative recycling process, the car windows are first broken into small pieces.



Then all the non-glass impurities like glue residue are eliminated. The resulting glass granulate is melted down and turned into new plate glass. That plate glass is then turned into a new car window. If this pilot is successful, the windows that are produced this way will be used in models in the Audi Q4 e-tron series in the future.





Together with its partner companies, Audi is taking up the challenge of establishing a closed material cycle* for car glass with this pilot project. The plan is part of Audi’s circular economy strategy. The company looks at its products over their entire life cycle. To the greatest extent possible, the raw materials that are involved are to be reintroduced into the production process once they are no longer being used. That way, resources can be conserved in development and manufacturing and the environmental effects can be reduced throughout the entire value chain.




Aluminum scraps from Audi’s press shop have been introduced into a similar closed circuit since 2017. With glass, another material circuit will now be closed. “Our goal is to use secondary materials everywhere it is technically possible and economically reasonable to do so. We’re working on introducing materials we have direct access to into closed circuits,” says Marco Philippi, Head of Procurement Strategy. “As of now, for example, old car glazing is not being used to produce new car windows. We want to change that.”



Recycling damaged glass means that less energy and raw material have to be used overall to produce windows – using processed materials ultimately makes it possible to reduce the demand for primary materials like quartz sand. Audi intends to use car windows produced this way in Audi Q4 e-tron series production. The company is banking on its collaboration with supplier companies to develop new material circuits and make the value chain more sustainable.




There is enough potential in it: at present, a large portion of discarded car windows or panoramic sunroofs are utilized and turned into beverage bottles or insulation materials, for example. If this project succeeds in turning damaged car windows back into new windowpanes, there will be several benefits: the quality of high-grade car glass will be preserved.



There is also another positive effect on carbon emissions. Recycling emits up to 30 percent less carbon dioxide compared with manufacturing new glass.





The first step: Reiling processes car glass and homogeneously separates its components



The glass recycling pilot project starts with selected dealerships in the Volkswagen Group’s retail network.




Customers whose cars have a damaged window set up appointments there. The retail partner checks to see if the window can be repaired. If it cannot, the window is replaced. The broken pane is delivered to Volkswagen’s Original Teile Logistik GmbH & Co. KG. This Volkswagen subsidiary organizes the disposal of parts that are no longer needed from Volkswagen AG workshops. Service partners remove car windowpanes from that process for recycling.



In the next step, the damaged windowpanes are delivered to Reiling Glas Recycling. There, they are first broken up into small pieces and processed. In the process, Reiling puts the old car glazing back into plate glass production for the first time. “Until now, the recycled material has mostly been turned into beverage bottles,” explains Daniel Rottwinkel, Plant Manager at Reiling Glas Recycling.



“Car glass has to meet the most stringent requirements, for example with respect to crash safety. Those demands don’t apply to bottles.” In the past, post-consumer glass from cars has not been used in plate glass production, but rather for different purposes with less rigorous requirements. That is where the joint project begins: the partner companies want to recycle the damaged glass back to original quality.



In order to be able to produce high-quality recyclable material from this used laminated glass, Reiling Glas Recycling uses modern, powerful equipment. The company sorts out non-glass materials like PVB (polyvinyl butyral) plastic layers in the glass, window edgings, metals, and wires, such as heating filament and antenna cables. The elimination process is carried out using magnets, non-ferrous metal separators, extraction units, and electro-optical sorting units. In the future, such PVB layers are also meant to be introduced into a vehicle circuit.





The second step: Saint-Gobain Glass turns the shards into new base glass and Saint-Gobain Sekurit makes that into auto glazing



In the next recycling step after the glass recyclate has been processed and all possible waste materials have been removed, Saint-Gobain Glass turns it into plate glass in Herzogenrath, Germany. To do that, the glass granulate is initially segregated by type for clear verification of source and color and then stored in bins. Producing new base glass requires the purest, most homogeneous glass recyclate possible.



 Saint-Gobain Glass then mixes the recyclate with, among other things, quartz sand, sodium carbonate, and chalk – the basic components of glass. At the moment, the proportion of recylate to other materials varies between 30 and 50 percent.



The target for the pilot project with Audi is about 40 tons of recycled car glass. “For us, this cycle of making new car windows out of old ones is an important step toward producing automotive glass in a way that conserves resources and energy,” says Dr. Markus Obdenbusch, production manager in charge of the Saint-Gobain float at the Herzogenrath site. “We’re just starting to look at glass as a recyclate, so we anticipate that there will be more potential for improvement.”


The plate glass is first processed into rectangles of about 3 x 6 meters (10 x 20 feet) each. After that, the affiliated company Saint-Gobain Sekurit produces automotive glass through an additional process.



Beyond the pilot project with Audi, Saint-Gobain Glass plans to put up to 30,000 tons of shards into production in Herzogenrath within the next three years, which will save a considerable amount of energy and natural resources and reduce carbon emissions and water use. That will mean that the company will emit up to 75 tons less CO₂ from a typical day’s tonnage.



The third step: The resulting automotive glass will be used for the Audi Q4 e-tron series
The three partner companies have decided to put the process to an initial one-year test so that they can learn about material quality, stability, and costs. If glass can be recycled in an economical and an ecologically meaningful way, car windows made from secondary materials will be used in the Audi Q4 e-tron series.



*More than 480,000 tons of carbon dioxide equivalent (CO2e) were saved in the Audi supply chain in 2021. CO₂ equivalents are units of measurement to standardize the climate impact of different greenhouse gases. It converts and encapsulates greenhouse gases in CO₂ equivalents.



The previously mentioned reduction in the Audi supply chain in 2021 was achieved by, among other things, using green energy in HV battery cell production and closing the material circuit for aluminum as well as the associated reuse of those materials. Without those steps, the conservation in Audi’s supply chain in 2021 would not have happened.

    
    
photos Audi

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25.04.2022 / Maggy Parries

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