Analysis of Mechanical Properties Related to Fiber Length of Closed-Loop-Recycled Offcuts of a Thermoplastic Fiber Composites (Organo Sheets)

Hummel, Sabine; Obermeier, Katharina Theresa; Zier, Katja; Krommes, Sandra; Schemme, Michael; Karlinger, Peter

doi:10.3390/ma15113872

Cited by 3 publications

(1 citation statement)

References 21 publications

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“…The study revealed that offcut layup barely influences the fiber length distribution compared with the flake size. Hummel et al 30 analyzed the mechanical properties related to fiber length of closed-loop-recycled offcuts of organo-sheet thermoplastic fiber composites. These were processed via injection molding to produce hybrid components such as car door modules.…”

Section: Introductionmentioning

confidence: 99%

Waste-to-Value Feasibility Study: Assessing the Viability and Quality of Incorporating Different Postindustrial Glass-Fiber Composites into Postconsumer Recycled Polypropylene

Shahroodi,

Krempl,

Zidar

et al. 2024

ACS Sustainable Chem. Eng.

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The reinforcement of recycled polypropylene with virgin glass fibers is a widely adopted practice to enhance the mechanical properties of recycled materials. Substituting virgin glass fibers with recycled ones from authentic waste streams poses multiple challenges. This article shows a possible solution for reusing two waste fractions that count as outstandingly challenging when trying to reach a high degree of circularity. Composites consisting of a recycled polypropylene matrix derived from Austrian household waste as well as 10, 30, and 50 wt % of two different postindustrial chopped polypropylene-glass fibers (GF-PP) were produced by extrusion in a twin-screw extruder, followed by injection molding. Fiber length measurements were conducted to characterize the quality and heterogeneity of the two input GF-PP waste composites. Subsequently, the performance of these compounds was assessed by investigating their thermal, rheological, morphological, and mechanical properties. The study revealed that the initial formulation and manufacturing method of the chopped GF-PP composite exerted a significant influence on the extent of reinforcement achieved in the recycled polypropylene composites. Despite the same processing principles and parameters, the different types of GF-PP waste composites exhibited significant differences in terms of their rheological and mechanical properties. The trend was also visible when comparing the results across various compound ratios. These compounds also demonstrated acceptable flow behavior and processability. Despite substantial fiber breakage during the compounding and injection molding processes, resulting in an 87−90% reduction in the average fiber length, the produced composites displayed appropriate mechanical properties, which are mostly comparable to virgin glass-fiber-reinforced polypropylene. The findings indicate that by optimizing both the type of postindustrial GF-/PP composites added to recycled polypropylene and the blend ratio, chopped GF-PP can be effectively enhanced and converted into short-fiber-reinforced recycled polypropylene. This process serves as a model for improved recycling practices.

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Section: Introductionmentioning

confidence: 99%

Waste-to-Value Feasibility Study: Assessing the Viability and Quality of Incorporating Different Postindustrial Glass-Fiber Composites into Postconsumer Recycled Polypropylene

Shahroodi,

Krempl,

Zidar

et al. 2024

ACS Sustainable Chem. Eng.

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Advancing Sustainable Automotive Manufacturing Through Production Waste Reuse: A Focus on Circularity and Environmental Impact Assessment

Iturrondobeitia,

Harismendy,

Echeverria-Altuna

et al. 2024

Preprint

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Recycled Glass Polypropylene Composites from Transportation Manufacturing Waste

et al. 2023

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In recent years there has been growing interest in developing recycling technologies for composites manufacturing scrap, process waste and end-of-life parts. The focus of this work was to establish processing routes and mechanical property bounds for glass-polypropylene (PP-GF) scrap from the production of parts for truck trailers, automobiles, and rail cars. This study considered PP-GF scrap and demonstrated extrusion-compression molding (ECM) as a viable route for the closed-loop manufacture of composite parts. The results were promising in terms of the strength and modulus retention of the PP-GF recyclate. The tensile strength and modulus was the highest for 50% and 66% recycled content, compared with 100% and 83% recycle content. The flexural strength and modulus of the 100% and 83% recycled compositions was higher than the 66% and 50% recycled content, respectively. The impact energy absorption of the PP-GF recyclate at at all fiber loadings was superior in absorbing energy compared with the incumbent (benchmark) plywood. This work is useful to designers seeking to incorporate recycled materials in their products.

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Analysis of Mechanical Properties Related to Fiber Length of Closed-Loop-Recycled Offcuts of a Thermoplastic Fiber Composites (Organo Sheets)

Cited by 3 publications

References 21 publications

Waste-to-Value Feasibility Study: Assessing the Viability and Quality of Incorporating Different Postindustrial Glass-Fiber Composites into Postconsumer Recycled Polypropylene

Waste-to-Value Feasibility Study: Assessing the Viability and Quality of Incorporating Different Postindustrial Glass-Fiber Composites into Postconsumer Recycled Polypropylene

Advancing Sustainable Automotive Manufacturing Through Production Waste Reuse: A Focus on Circularity and Environmental Impact Assessment

Recycled Glass Polypropylene Composites from Transportation Manufacturing Waste

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