Municipal Waste Composite Aggregates for Injection Molding Feedstock
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current recycling processes for municipal waste are inefficient due to the need for lengthy and costly sorting processes, which consume time, energy, and resources, and are limited by the poor binding properties of different types of plastics.
Innovation Solution
A process that blends municipal waste with thermoplastic polymers to create composite aggregates with a high polymeric content, allowing for minimal sorting and self-heating during mixing to produce feedstocks suitable for injection molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional sorting processes are used to separate municipal waste into different components, then the quality of recycled materials is improved, but the time, energy and resources consumption increases significantly
Solution Approach 1:
The patent merges multiple waste streams and plastic types into a single composite aggregate without requiring separation. Different plastic materials that traditionally would need to be sorted are instead combined together with binding agents to form a unified recyclable product, eliminating the time-consuming sorting process while maintaining material quality.
Solution Approach 2:
The invention creates composite aggregates by combining different plastic materials, fibers, and binding agents into a new composite material. This composite approach allows diverse waste components to be utilized together rather than requiring separation into pure material streams, thus improving recycling efficiency while maintaining product quality.
2Manufacturing precision
If traditional sorting processes are used to separate municipal waste into different components, then the quality of recycled materials is improved, but the energy and resources consumption increases significantly
Solution Approach 1:
The patent merges multiple waste streams and plastic types into a single composite aggregate without requiring separation. Different plastic materials that traditionally would need to be sorted are instead combined together with binding agents to form a unified recyclable product, eliminating the energy-consuming sorting process while maintaining material quality.
Solution Approach 2:
The invention creates composite aggregates by combining different plastic materials, fibers, and binding agents into a new composite material. This composite approach allows diverse waste components to be utilized together rather than requiring separation into pure material streams, thus reducing energy consumption while maintaining product quality.
3Productivity
If different types of plastics are bound together in unsorted municipal waste, then the recycling rate is improved, but the binding quality deteriorates due to poor adhesion between different plastic types
Solution Approach 1:
The patent introduces binding agents as intermediaries between different plastic materials in the composite aggregate. These binding agents facilitate adhesion between incompatible plastic types that would otherwise fail to bond, enabling high recycling rates while maintaining reliable binding quality in the final composite material.
Solution Approach 2:
The invention creates composite aggregates by combining different plastic materials, fibers, and binding agents into a new composite material. This composite approach allows diverse waste components to be utilized together rather than requiring separation into pure material streams, thus reducing energy consumption while maintaining product quality.
4Reliability
If external heating is applied to melt thermoplastic polymers during mixing, then the binding efficiency is improved, but the energy consumption increases
Solution Approach 1:
The patent employs self-heating during the mixing process, where the mechanical energy of mixing is converted into thermal energy through friction and viscous dissipation. This self-service heating approach provides sufficient thermal energy to melt thermoplastic polymers and achieve effective binding without requiring external heating systems, thus maintaining binding efficiency while dramatically reducing energy consumption.
Solution Approach 2:
The patent replaces the thermal system (external heating) with a mechanical system (self-heating through mixing). The mechanical energy input during mixing is converted into heat through friction and viscous dissipation, providing the necessary thermal energy for polymer melting and binding without requiring separate heating equipment or external energy input.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The process enables the efficient recycling of unsorted municipal waste into composite materials with controlled flow and mechanical properties, reducing production costs and energy consumption while increasing recycling rates.
Implementation Method 1
mixing the mixture in a vessel under conditions permitting self-heating of the mixture to a temperature below the melting temperature of said thermoplastic polymers
Data Source
AI summary
The present disclosure concerns recycling of municipal by a process for preparing composite aggregates and feedstocks for injection molding from the municipal waste. The process involves blending a first source material derived from solid municipal waste and comprising more than 50 wt % of polymeric material, together with a second source material that comprises one or more thermoplastic polymers, to obtain a mixture comprising a total polymeric content of at least about 60 wt %, and mixing the mixture in a vessel under conditions permitting self-heating of the mixture to a temperature below the melting temperature of said thermoplastic polymers to obtain composite aggregates in which said thermoplastic polymers bind the particles of the first source material.