Multilayer Food Packaging with Insulating Void Layer
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Solution Overview
Problem
Existing food packaging containers fail to maintain food temperature and prevent moisture-related issues, such as sogginess, while also posing environmental concerns due to non-recyclable materials like expanded polystyrene and degrading paper-based options.
Innovation Solution
A food packaging material comprising a moisture-permeable inner layer, a moisture-impermeable outer layer, and a moisture-tolerant insulating middle layer with an undulating form, which allows moisture to condense and release latent heat back into the container, maintaining food temperature and preventing sogginess, and is made from recyclable and compostable paper or cardboard materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a closed polystyrene box is used for insulation, then heat retention is improved, but moisture control deteriorates leading to soggy food
Solution Approach 1:
The container is divided into multiple functional layers: an inner moisture-permeable layer, a middle insulating layer with voids, and an outer moisture-impermeable layer. Each layer performs a specific function - the inner layer allows moisture escape, the middle layer provides insulation and moisture tolerance, and the outer layer prevents external moisture ingress while allowing condensation.
Solution Approach 2:
Different regions of the container have different properties tailored to local needs. The inner layer is moisture-permeable where moisture originates, the middle layer has voids for insulation and moisture accommodation, and the outer layer is moisture-impermeable where environmental protection is needed. This localized differentiation resolves the contradiction between heat retention and moisture control.
2Object-affected harmful factors
If the container allows moisture to escape to the environment, then moisture control is improved, but heat retention deteriorates
Solution Approach 1:
The middle insulating layer with voids acts as an intermediary between the inner moisture-permeable layer and the outer moisture-impermeable layer. It provides a pathway for moisture management through its moisture-tolerant void structure while simultaneously providing thermal insulation, thus mediating between moisture control and heat retention requirements.
Solution Approach 2:
The middle layer incorporates voids and porous structures that allow moisture accommodation and transport while maintaining insulation properties. This porous architecture enables moisture management without requiring complete openness to the environment, thus preserving heat retention while controlling moisture.
3Object-generated harmful factors
If paper or card containers are used instead of polystyrene, then environmental friendliness is improved, but insulation performance deteriorates
Solution Approach 1:
The container uses a composite structure combining paper/cardboard layers with air voids. The paper provides environmental friendliness and structural integrity, while the incorporated voids provide the insulating air layer. This composite approach maintains the ecological benefits of paper while achieving insulation performance comparable to polystyrene.
Solution Approach 2:
The design adds a third dimension by incorporating voids and layered structures within the paper container walls. This dimensional complexity creates air pockets that provide insulation without requiring thicker solid material, thus maintaining insulation performance while using environmentally friendly paper-based materials.
4Temperature
If paper containers are made thicker to improve insulation, then heat retention is improved, but structural integrity deteriorates due to moisture degradation
Solution Approach 1:
The container wall is segmented into multiple thin layers rather than one thick layer. The inner layer handles moisture permeability, the middle layer provides insulation with voids, and the outer layer provides moisture protection. This segmentation allows each layer to be optimized for its specific function while maintaining overall structural integrity despite moisture exposure.
Solution Approach 2:
The multi-layer composite structure combines materials with different properties: moisture-permeable paper, moisture-tolerant insulating material with voids, and moisture-impermeable outer layer. This composite construction provides both insulation and moisture protection, preventing the structural degradation that would occur in single-material thick paper containers.
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 effectively retains heat and prevents moisture from affecting the food's quality, while being environmentally friendly by using recyclable and compostable materials, improving both food quality and reducing environmental impact.
Implementation Method 1
a third, insulating moisture-tolerant layer disposed between the first and second layers and spacing the first and second layer apart
Implementation Method 2
moisture emanating from food within the container passes through the first layer and the third layer and condenses on the second, moisture-impermeable outer layer
Implementation Method 3
moisture emanating from food within the container passes through the first layer and the third layer and condenses on the second, moisture-impermeable outer layer
Data Source
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AI summary
The present invention relates to thermally insulating food packaging and more particularly to containers for storing or transporting food when the temperature of the food is significantly different to that of the surrounding environment. In particular, a food packaging material for enclosing food is described, the material comprises a first, moisture-permeable inner layer, a second, moisture-impermeable outer layer and a third, insulating moisture-tolerant layer disposed between the first and second layers and spacing the first and second layer apart, wherein the third layer has an undulating form comprising voids. The first, second and third layers are arranged such that moisture emanating from food within the container passes through the first layer and the third layer and condenses on the second, moisture-impermeable outer layer.