The Circular Economy of Plastics: From Bakery Waste to Curlers with a Care Effect
Improving the recycling of plastics and biopolymers
The circular economy is a key component of a sustainable future. The technology transfer project “TechCirclePolymers” at the Institute for Circular Economy of Bio:Polymers (ibp) at Hof University of Applied Sciences addresses exactly this challenge. The project aims to improve the recycling of plastics and biopolymers, thereby reducing greenhouse gas emissions and replacing fossil-based raw materials with natural alternatives. A particular focus is on increasing recyclability and extending the lifespan of products.
This research initiative, consisting of several subprojects and led by Prof. Dr. Michael Nase, has been running since 2023 and will continue until the end of 2026. It aims to create innovative solutions for both the economy and the environment. “Our goal is to develop sustainable materials through innovative research that benefit both the environment and the economy,” say the two coordinating scientific researchers, Isabell Kleiber and Christin Baumgart.
BioKrümelKleie – Using Bakery Waste as Raw Material
A prime example of combining sustainability with innovation is the subproject “BioKrümelKleie.” Here, bakery waste such as bran and crumbs are incorporated into bioplastics to manufacture new products, such as plant pots, through injection molding. These products, which can be used in horticulture and forestry, are not only biodegradable but also serve as water reservoirs for plants, reducing the need for watering. Initial tests have shown that the material decomposes slowly under natural conditions, helping to minimize waste – eliminating the need to dig up or dispose of used plant pots.
BioCaps – Sustainable Screw Caps Made from Bioplastics
The “BioCaps” subproject is also focused on sustainable alternatives. Instead of conventional polypropylene, a bio-based plastic is being developed for screw caps. Special additives optimize the material to ensure the quality and functionality of the closures. For instance, it helps preserve the aroma of food and remains recyclable. The project demonstrates that resource-efficient solutions can also be economically viable. Efforts are also being made to further extend the lifespan of the closures and make their production as energy-efficient as possible.
RecycleBra – Foam Recycling for New Products
The “RecycleBra” project is exploring a new approach to recycling PU foam waste. Instead of disposing of it, the foam is shredded and processed into new foam sheets. Innovative adhesives enable the particles to be re-bonded, creating stable yet flexible materials. By adjusting the adhesive composition, different levels of hardness and flexibility can be achieved. This method saves resources, reduces waste, and opens new possibilities for recycling foam products.
CO₂ Reduction – Low-Emission Protective Films
The “CO₂ Reduction” project contributes to lowering carbon dioxide emissions by developing a new solvent-free adhesive layer for self-adhesive protective films used on window frames. The goal is to apply the adhesive directly to the carrier film, saving material and significantly reducing the ecological footprint. The project’s results are now being further optimized. Additionally, tests have been conducted to determine the recyclability of the protective film, reinforcing the circular economy approach. This leads to a resource-efficient alternative to conventional protective films.
Eco Straw – Reusable Straws Made from Bakery Waste
Even everyday products can be made more sustainable. In the “Eco Straw” subproject, breadcrumbs (similar to those in the first subproject) are used as fillers in biopolymers to develop durable reusable straws. Antibacterial and other additives improve hygiene, making the straws water-resistant and dishwasher-safe. Initial tests have shown promising results regarding their resistance to bacteria and mold. Further work is being done to optimize the material composition to ensure the longest possible lifespan of the straws.
BioAnalytics – Optimizing Bio-Based Plastics
The “BioAnalytics” project focuses on optimizing thermoplastic starch (TPS), a cost-effective bioplastic that is prone to moisture absorption and deformation. By combining it with polybutylene succinate (PBS) and targeted additives, a more durable alternative is being developed. Comprehensive analyses are being conducted, with the results compiled in an e-book. The aim is to provide companies with in-depth information on the processing and properties of sustainable plastics to encourage their use.
BioCurlers – Eco-Friendly Curlers with a Care Effect
Sustainable innovations are also being developed for the service industry. The “BioCurlers” subproject is creating environmentally friendly hair curlers made from polylactic acid (PLA), replacing the polyethylene used previously and reducing the reliance on fossil-based raw materials. Additionally, ingredients such as plant-based oils or cinnamon can be incorporated into the material to nourish and protect the hair during use. These new curlers are not only more sustainable but also promote smoother and healthier hair.
With these projects, “TechCirclePolymers” makes a significant contribution to a sustainable plastics industry, demonstrating that innovation and environmental protection go hand in hand. The technology transfer primarily targets small and medium-sized enterprises in structurally weak regions. The first four subprojects have already been completed.
Funding
“TechCirclePolymers” is a technology transfer program funded by the European Regional Development Fund (ERDF) of the European Union and supported by the Bavarian State Ministry for Economic Affairs, Regional Development, and Energy, as well as the Upper Franconia Foundation.
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