Biodegradable Microcellular Foams via Supercritical Fluid Injection
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Solution Overview
Problem
Conventional flexible foam manufacturing methods rely on non-renewable polymers and chemical additives that are not biodegradable, leading to environmental harm and unsustainable waste management.
Innovation Solution
A process for injection molded microcellular foaming using biodegradable and industrially compostable thermoplastic resins, which produces flexible foams that can be composted at the end of their life cycle, reducing environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional flexible foam manufacturing methods are used with non-renewable polymers and chemical additives, then the foam achieves desired technical performance properties, but the material becomes non-biodegradable and harmful to the environment
Solution Approach 1:
The patent changes the fundamental parameters of foam manufacturing by replacing non-renewable polymers with bio-derived thermoplastic polymers and substituting chemical blowing agents with physical blowing agents (supercritical fluids). This parameter transformation maintains the foam's technical performance while eliminating environmental harm and enabling biodegradation
Solution Approach 2:
The patent replaces chemical systems (chemical blowing agents and crosslinking agents) with physical systems (supercritical fluids and physical crosslinking mechanisms). This substitution eliminates harmful chemical additives while achieving the same foam expansion and structural properties through physical means
2Stability of the object's composition
If biodegradable thermoplastic polymers are used in conventional foam manufacturing with chemical blowing agents and crosslinking, then the polymer becomes renewable, but the chemical additives contaminate the material and prevent biodegradation
Solution Approach 1:
The patent extracts and removes chemical blowing agents and crosslinking agents from the foam manufacturing process. By eliminating these harmful chemical additives, the bio-derived polymer remains pure and capable of biodegradation, while still achieving the desired foam structure through physical means
Solution Approach 2:
The patent introduces supercritical fluids as an intermediary substance to replace chemical blowing agents. These physical blowing agents enable foam expansion without leaving harmful residues, allowing the bio-polymer to maintain its biodegradability while achieving the required foam properties
3Strength
If crosslinking is applied to biopolymer foams to improve structural properties, then the foam strength increases, but the precursor components cannot be separated and biodegradation is prevented
Solution Approach 1:
The patent employs reversible or weak physical crosslinking mechanisms instead of permanent chemical crosslinks. This allows the foam to achieve adequate structural properties during use while enabling complete separation and biodegradation at the end of its service life, aligning with a circular economy approach
4Loss of substance
If landfills are used for non-biodegradable foam waste, then waste disposal is achieved, but environmental harm and methane emissions increase
Solution Approach 1:
The patent transforms the end-of-life fate of foam from harmful landfill decomposition into beneficial biodegradation. By designing foams that compost into nutrient-rich material, the invention converts what would be environmental harm into a useful product that amends poor soils and supports plant growth
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 creates flexible foams with technical performance properties comparable to conventional non-biodegradable foams, while offering a sustainable end-of-life solution through composting, reducing waste and environmental harm.
Implementation Method 1
The injection molded microcellular flexible foam is produced from biodegradable and industrially compostable thermoplastic resins
Implementation Method 2
injection molded microcellular foaming various flexible foam compositions
Implementation Method 3
biodegradable and industrially compostable thermoplastic resins... can be composted at the end of their life cycle
Implementation Method 4
industrially compostable... offering a sustainable end-of-life solution through composting
Data Source
AI summary
This document discloses a process for manufacturing recyclable injection molded microcellular foams for use in, footwear components, seating components, protective gear components, and watersport accessories. The process includes the steps of providing a thermoplastic polymer which comprises at least one monomer derived from depolymerized post-consumer plastic, inserting a fluid into a barrel of a molding apparatus. The fluid is introduced under temperature and pressure conditions to produce a super critical fluid. The process further includes mixing the thermoplastic polymer and super critical fluid so as to create a single phase solution, and injecting the single phase solution into a mold of an injection molding machine under gas counter pressure. The process further includes foaming the single phase solution by controlling the head and temperature conditions within the mold.