Repulpable Food Tray Coating for Leakage Prevention
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Solution Overview
Problem
Existing food trays made from polystyrene are not biodegradable, pose health concerns due to potential toxic leaching, and contribute to landfill burdens, while custom composite paperboard solutions are more expensive and less cost-effective.
Innovation Solution
A disposable repulpable and recyclable food tray formed from off-the-shelf paperboard made from natural wood fibers, coated with a waterproof polyethylene or polypropylene coating for the food cavity and a moisture-resistant water-based acrylic coating for the exterior, reducing costs and environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polystyrene is used to make food trays, then waterproofing and structural integrity are achieved, but biodegradability is lost and environmental harm increases
Solution Approach 1:
The patent uses composite paperboard materials that combine natural wood fibers with waterproofing agents (polyolefin synthetic pulp, clay, and cationic dispersed rosin) to create a material that is both waterproof and biodegradable. This composite structure allows the tray to maintain reliability while eliminating environmental harm associated with polystyrene.
Solution Approach 2:
The patent changes the material composition parameters by using 60%-80% virgin wood pulp combined with specific ratios of waterproofing agents (20%-40% polyolefin synthetic pulp, 10%-15% clay, 1%-2% cationic dispersed rosin). This parameter optimization achieves waterproofing through the fusion of components while maintaining biodegradability.
2Reliability
If custom composite paperboard with waterproofing agents is used, then waterproofing is achieved, but manufacturing cost increases
Solution Approach 1:
The patent makes the paperboard material multi-functional by integrating waterproofing, structural integrity, and biodegradability into a single composite material system. This universality eliminates the need for separate waterproofing treatments or coatings, thereby reducing manufacturing complexity and cost while maintaining reliable waterproofing performance.
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 solution provides a cost-effective, biodegradable, and recyclable food tray that prevents liquid leakage and wicking, meeting ASTM specifications for recyclability and FDA compliance, while reducing packaging volume and transportation costs.
Implementation Method 1
coated with a waterproof coating, for example, a polyethylene or polypropylene coating, to provide a waterproof food cavity that prevents leakage of liquid from the food item being absorbed by the food tray
Implementation Method 2
coated with a moisture resistant coating, for example, a water based acrylic coating, to provide a moisture resistant exterior support surface which prevents wicking of liquid into the food tray
Data Source
AI summary
A repulpable and recyclable case ready food tray is disclosed for carrying various food items, such as meat, poultry and produce that is typically used for retail display. The food tray is formed from paperboard made from natural wood fiber that is coated to provide a waterproof food cavity for preventing leakage of liquid from the food item and a moisture proof exterior support surface which allows excess liquid to be released from the food tray during the manufacturing process while providing a moisture proof surface to prevent wicking of liquid into the food tray if the tray is placed on a wet surface.