Low-density pla-coffee ground composite for sustainable packaging
Innovative composite using PLA and waste coffee grounds designed for injection-molded packaging closures. Offers low-density, recyclable, and compostable solutions aligning with sustainability goals.
Overview
The proposed solution is a novel composite material that combines polylactic acid (PLA) with waste coffee grounds to create a low-density, injection-moldable composite. This material is specifically designed for packaging closures, offering a sustainable alternative that meets flotation requirements for fiber-based recycling systems without the need for foaming agents. The composite leverages the complementary properties of PLA and coffee grounds to enhance mechanical performance and environmental compatibility, aligning with corporate sustainability and circular economy goals.
Technical specifications
- Composition: PLA blended with post-consumer or industrial waste coffee grounds
- Density: Achieves a composite density below 1 g/cm³, suitable for flotation in recycling systems
- Processing: Utilizes twin-screw compounding and injection molding techniques
- Mechanical properties: Optimized filler loading and surface treatment ensure sufficient tensile strength and impact resistance
- Environmental benefits: Compostable under industrial conditions and supports waste diversion from landfills
- Regulatory compliance: Formulations are tested for food-contact safety and migration compliance
Technology readiness level
This technology is at TRL 8, having been validated in a relevant environment with comprehensive testing, and is ready for industry adoption and commercial scale-up. The solution includes thorough documentation for processing guidelines and sustainability analysis, supporting its integration into manufacturing practices.
About Western Washington University
Western Washington University is a comprehensive public university and Washington’s third‑largest public institution, serving a broad mix of undergraduate and graduate programs from its Bellingham campus and statewide locations. Industry collaboration is enabled by a waterfront Technology Development Center for joint R&D and by a coastal field station with direct access to the Salish Sea. Companies can engage through industry‑accessible instrumentation and facilities, sponsored projects, and regional business support resources. Research is supported by competitive federal and state funding, including the National Science Foundation. The Office of the Vice Provost for Research manages IP, NDAs/MTAs, and licensing, and offers commercialization training with the Washington Research Foundation.
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