Stretchable Cellulosic Barrier Wrap for Biodegradable Packaging
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Solution Overview
Problem
Plastic shrink wrap is environmentally harmful due to its non-biodegradability and difficulty in recycling, posing a significant environmental concern as it often ends up in oceans and is challenging to reprocess.
Innovation Solution
A stretchable barrier wrap composed of an extensible cellulosic substrate with a high fiber content and an aqueous polyolefin dispersion barrier layer, providing stretchability and moisture barrier properties while being biodegradable and recyclable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional plastic shrink wrap is used, then barrier properties and mechanical strength are maintained, but environmental harm increases due to non-biodegradability and recycling difficulty
Solution Approach 1:
The patent applies composite materials by combining cellulosic substrate (paper) with polymer coatings (polyethylene, polypropylene, or their copolymers) to create a multi-layer structure that provides both barrier properties and mechanical strength while maintaining biodegradability and recyclability. This composite approach resolves the contradiction by integrating materials with complementary properties.
Solution Approach 2:
The patent changes the chemical composition parameters of the wrap by using water-based polymer dispersions instead of traditional plastic materials. The polymer content is controlled at 1-20% by weight, and the cellulosic substrate provides the biodegradable base, transforming the material properties to achieve environmental friendliness while maintaining functional performance.
2Object-affected harmful factors
If biodegradable shrink wrap is used, then environmental friendliness improves, but cost increases and specific disposal environment is required
Solution Approach 1:
The patent optimizes the polymer content parameter to 1-20% by weight, which balances performance and cost. This parameter adjustment allows the use of conventional polymer dispersions at economical concentrations while achieving sufficient barrier properties, thereby reducing manufacturing cost compared to fully biodegradable alternatives.
Solution Approach 2:
The patent employs inexpensive cellulosic substrate as the base material, which is readily available and low-cost. The combination with minimal polymer coating creates an economical disposable wrap that maintains environmental friendliness while significantly reducing manufacturing costs compared to traditional biodegradable shrink wraps.
3Reliability
If plastic shrink wrap is used, then barrier properties are maintained, but recyclability and repulpability are reduced
Solution Approach 1:
The patent segments the wrap into distinct functional layers: a cellulosic substrate base layer and a thin polymer coating layer. This segmentation allows the polymer coating to provide barrier properties while the cellulosic substrate maintains recyclability and repulpability, as the substrate can be separated and processed independently.
Solution Approach 2:
The patent controls the polymer coating thickness and content to 1-20% by weight, which is sufficient for barrier properties but low enough to allow the cellulosic substrate to dominate the material's end-of-life behavior. This parameter control enables the wrap to be recycled with paper streams and repulped effectively.
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 offers a sustainable alternative to plastic shrink wrap by enhancing repulpability and recyclability, maintaining mechanical strength and improving barrier properties, thus addressing environmental concerns.
Implementation Method 1
an aqueous polyolefin dispersion barrier layer on the extensible cellulosic substrate
Implementation Method 2
an extensible cellulosic substrate having a stretchability of at least 5%
Data Source
AI summary
A stretchable barrier wrap includes an extensible cellulosic substrate having a stretchability of at least 5% and an aqueous polyolefin dispersion barrier layer on the extensible cellulosic substrate.