Recyclable Composite Dissolvable Polymer Layer Food Containers
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Solution Overview
Problem
Conventional paper-based pet food bags are not recyclable due to their plastic film/liner, which renders them non-recyclable and poses environmental and commercial inefficiencies.
Innovation Solution
Development of recyclable composites with a dissolvable polymer layer on a paper substrate, specifically designed for use with food containers, where the polymer layer is biodegradable and suitable for contact with food, providing grease resistance and recyclability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a plastic film/liner is used on paper-based food containers, then grease resistance is improved, but recyclability deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the polymer layer from conventional plastics to specific water-soluble polymers (polyvinyl alcohol, polyacrylonitrile, polyacrylic acid, carboxymethyl cellulose, or starch) with controlled molecular weights and degrees of hydrolysis, enabling the layer to dissolve in water at temperatures of 40-60°C while maintaining grease resistance during storage and use
Solution Approach 2:
The patent applies a preliminary coating action by laminating or extruding the water-soluble polymer layer onto the paper substrate before the container is used, creating a pre-formed grease-resistant barrier that will automatically dissolve under hot water conditions (e.g., during dishwashing or hot water rinsing) to enable recycling
2Reliability
If a dissolvable polymer layer is used to enable recyclability, then recyclability is improved, but structural integrity deteriorates
Solution Approach 1:
The patent carefully controls physical parameters including polymer molecular weight (10,000-1,000,000), degree of hydrolysis (70-99% for polyvinyl alcohol), layer thickness (1-50 micrometers), and basis weight (5-100 gsm) to achieve optimal balance between maintaining structural integrity during storage and handling while ensuring complete dissolution under hot water conditions
Solution Approach 2:
The patent creates different functional zones within the polymer layer by controlling local composition and thickness variations, with the polymer layer providing grease resistance where needed while maintaining overall structural integrity of the composite container through optimized bonding with the paper substrate
3Reliability
If a dissolvable polymer layer is used, then recyclability is improved, but grease resistance deteriorates
Solution Approach 1:
The patent optimizes chemical parameters including polymer selection (water-soluble polymers with specific functional groups), degree of hydrolysis (70-99% for PVA), and layer thickness to create a material that maintains hydrophobic properties and grease resistance at storage temperatures while becoming water-soluble and recyclable under hot water conditions (40-60°C)
Solution Approach 2:
The patent creates a dynamic material system where the polymer layer's properties change based on temperature and water exposure: maintaining grease resistance and structural integrity during storage and handling, then transitioning to a dissolved state under hot water rinsing conditions to enable recycling of the paper substrate
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 recyclable composite is effective in preventing grease penetration, maintaining structural integrity, and being recyclable, meeting FDA standards for food contact and environmental sustainability.
Implementation Method 1
a dissolvable polymer layer on the paper substrate
Data Source
AI summary
Disclosed herein are advantageous recyclable composites having a dissolvable polymer layer, and related methods of fabrication and use thereof. The present disclosure provides recyclable composites having a dissolvable polymer layer, and systems/methods for fabricating the recyclable composites and systems/methods for utilizing recyclable composites with food containers. More particularly, the present disclosure provides advantageous recyclable composites having a paper substrate and a dissolvable polymer layer on the paper substrate, wherein the recyclable composite is configured and dimensioned to be positioned relative to a food container vessel for use with the food container vessel, the recyclable composite suitable for coming into contact with food.