Biodegradable PLA PBSA Sheet for Liquid Pouches
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Solution Overview
Problem
Current biodegradable sheets for packaging liquids are lacking in physical strength, flexibility, gas impermeability, and light transmittance, making them unsuitable for long-term use as food or drink receptacles, and existing biodegradable packaging is not environmentally friendly.
Innovation Solution
A biodegradable sheet composed of 15-25% w/w PLA and 75-85% w/w PBSA, with a multi-layered structure including an inner layer of 100% PHA or PBAT, providing a stress at maximum load of at least 15 MPa, a strain at break of at least 300%, and a Young's Modulus of at least 200 MPa, along with a separable array of pouches for easy liquid access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If biodegradable materials are used for packaging, then environmental friendliness is improved, but physical strength and flexibility deteriorate
Solution Approach 1:
The patent uses a composite material consisting of PLA (15-25% w/w) and PBSA (75-85% w/w) to create a biodegradable sheet that maintains both environmental friendliness and physical strength. This composite approach allows the material to achieve stress at maximum load of at least 15 MPa and Young's Modulus of at least 200 MPa while remaining biodegradable, resolving the contradiction between environmental benefits and mechanical performance.
2Object-affected harmful factors
If biodegradable sheets are used for liquid packaging, then environmental impact is reduced, but gas impermeability and light transmittance deteriorate
Solution Approach 1:
The PLA/PBSA composite material provides inherent gas and liquid impermeability while maintaining biodegradability. The specific composition ratio (15-25% PLA and 75-85% PBSA) creates a material structure that effectively blocks gas permeation, making it suitable for long-term liquid storage without compromising environmental friendliness.
3Shape
If flexible biodegradable materials are used, then bend and folding capability is improved, but melting point and thermal stability deteriorate
Solution Approach 1:
The patent optimizes the composition parameters by controlling the ratio of PLA to PBSA (15-25% PLA and 75-85% PBSA) to achieve the desired balance between flexibility and thermal stability. This parameter optimization allows the material to exhibit good bend and folding capability while maintaining sufficient melting point for packaging applications.
Data Source
AI summary
Disclosed is a biodegradable sheet prepared from biodegradable material, a process for preparing the biodegradable sheet and uses thereof. One of the disclosed uses of the biodegradable sheet is in the preparation of a flexible liquid receptacle. Disclosed also is a flexible liquid receptacle arranged as an array of several receptacle units that are attached to one another and that may be detached from one another by tearing along a perforated line created between each two receptacle units. The disclosed array may also include a hanger, thus allowing the array to be hung from any appropriate means. Further disclosed is a biodegradable sheet including at least one layer comprising about 15-25% w/w PLA and about 75-85% w/w PBSA.