Biodegradable Coating for Moisture-Resistant Food Packaging
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Solution Overview
Problem
Conventional disposable food service and packaging items face challenges in achieving moisture resistance while being biodegradable and compostable, as existing materials are either not durable enough or require high-temperature processing, which is environmentally costly and inefficient.
Innovation Solution
Development of a biodegradable and compostable coating formulation using cellulose esters, biodegradable polymers, waxes, and release agents that can be applied to substrates without the need for elevated temperatures, providing improved moisture resistance, heat sealability, and product release properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If starch and/or cellulosic-based materials are used to make biodegradable disposable food service items, then environmental concerns are addressed, but moisture resistance deteriorates
Solution Approach 1:
The patent applies composite materials by combining starch and/or cellulosic base materials with a biodegradable polymer coating layer. This composite structure allows the substrate to provide biodegradability while the coating layer provides moisture resistance, resolving the contradiction between environmental friendliness and moisture protection.
Solution Approach 2:
The patent uses a thin film coating applied to the surface of disposable food service items. This thin film provides the necessary moisture barrier while maintaining the biodegradable nature of the underlying starch or cellulosic material, enabling the item to resist moisture during use but still degrade after disposal.
2Reliability
If conventional polymeric waterproofing materials are used to improve moisture resistance, then moisture resistance is improved, but biodegradability deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the coating material by selecting biodegradable polymers with specific molecular structures and compositions that provide adequate moisture resistance while maintaining biodegradability. This allows achieving the desired moisture barrier properties without sacrificing environmental compatibility.
3Productivity
If starch-based materials are cooked in heated molds to form disposable items, then manufacturing efficiency is improved, but moisture resistance deteriorates
Solution Approach 1:
The patent applies a moisture-resistant coating to the disposable food service items after they are formed through heated mold processing. This preliminary coating step adds the necessary moisture barrier properties to the already-manufactured items, separating the forming process from the moisture protection function.
4Strength
If wax or fiber sizing agents are added to strengthen the matrix material, then strength is improved, but moisture resistance deteriorates under high-moisture conditions
Solution Approach 1:
The patent uses a continuous thin film coating that provides a complete barrier against moisture, preventing moisture penetration that would otherwise weaken the wax or fiber-sized matrix. This coating shell protects the underlying strengthened material from moisture degradation.
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 coating significantly reduces Moisture Vapor Transmission Rate (MVTR), making it suitable for high-moisture applications, is cost-effective, and maintains performance in both microwave and conventional ovens, while being environmentally friendly and easy to apply.
Implementation Method 1
The coating significantly reduces Moisture Vapor Transmission Rate (MVTR)
Data Source
AI summary
Some embodiments of the invention generally relate to a moisture barrier coating that is biodegradable and compostable. Some embodiments also relate to a coating that is dual ovenable. Such coatings may be used to increase moisture resistance and provide non-stick or release characteristics when applied to biodegradable and compostable disposable food packaging and food service items. In some embodiments, a plasticizer, an amide wax and optionally a rosin are added to a cellulose-ester-based coating to increase moisture resistance. In other embodiments, a biodegradable polymer, an amide wax, optionally a plasticizer, and optionally a rosin are added to a cellulose-ester-based coating to drastically increase moisture resistance. In still other embodiments, phospholipids or medium-chain triglycerides or increased levels of amide wax may be added to the either of the embodiments above to provide enhanced release characteristics.