Transparent Cellulosic Packaging With Polymer Impregnation
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Solution Overview
Problem
Cellulosic materials used in packaging lack transparency, which is essential for visually inspecting the contents without opening the package, and existing attempts to enhance transparency, such as chemical treatments, result in materials that are not food-safe or are not recyclable.
Innovation Solution
A cellulosic fibrous material impregnated with a polymer to achieve a direct light transmittance above 60% for visible light, allowing for transparent packaging that is food-safe, recyclable, and can be made stiff or stretchable for various packaging forms, with optional barriers to oxygen, grease, and moisture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cellulosic material is used for packaging, then environmental friendliness and recyclability are improved, but transparency is worsened
Solution Approach 1:
The patent applies composite materials by combining cellulosic fibrous material with a transparent polymer coating or lamination layer. This creates a hybrid structure where the cellulosic base provides environmental benefits and the polymer layer provides transparency, allowing the packaging to simultaneously achieve both environmental friendliness and visual inspection capability without requiring complex multi-material assemblies.
2Illumination intensity
If chemical treatment is applied to cellulosic material to enhance transparency, then transparency is improved, but food safety and recyclability are worsened
Solution Approach 1:
The patent extracts the transparency-enhancing function from harmful chemical treatments and transfers it to a food-safe polymer coating or lamination layer. This separates the optical property enhancement from the chemical treatment process, allowing transparency to be achieved while maintaining food safety and recyclability of the cellulosic base material.
Solution Approach 2:
The patent introduces a polymer coating or lamination layer as an intermediary between the cellulosic material and the transparency requirement. This intermediary layer provides the necessary optical properties while being food-safe and compatible with recycling processes, eliminating the need for direct chemical treatment of the food-contacting cellulosic surface.
3Illumination intensity
If thin layers of paper are used to achieve transparency, then transparency is improved, but mechanical strength and elongation at break are worsened
Solution Approach 1:
The patent creates a composite structure where a thin transparent polymer coating or lamination layer is applied to a cellulosic substrate. The thin polymer layer provides the necessary transparency, while the cellulosic base material provides the mechanical strength and structural integrity, allowing the package to maintain sufficient strength for handling and processing despite the reduced thickness required for transparency.
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 transparent packaging that allows clear viewing of contents, is environmentally friendly due to recyclability and compostability, and maintains mechanical strength and barrier properties, suitable for a wide range of packaging applications.
Implementation Method 1
the impregnated portion has a (direct) light transmittance above 60% for visible light
Data Source
AI summary
The invention is directed to a three-dimensional food packaging (100) having a packaging interior (V) and being made of a cellulosic fibrous material (200). At least a portion (111) of the food packaging (100) delimiting at least part of the packaging interior (V) is impregnated with a polymer (300) such that the impregnated portion (111) has a light transmittance above 60% for visible light.