Absorbent Article Composition for Easier Polyolefin Recycling
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Solution Overview
Problem
Absorbent articles contain a mix of recyclable and non-recyclable materials, making recycling complex and costly, and rely heavily on petrochemicals, which are a finite resource, while consumer demand for sustainable and recyclable products grows.
Innovation Solution
Design absorbent articles with a high polyolefin content and bio-based materials, reducing the number of materials and increasing bio-based content to simplify recycling and reduce reliance on non-renewable resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If absorbent articles contain a wide variety of different materials (plastic films, foam, superabsorbent polymer particles, natural materials), then the article achieves desired characteristics (softness, breathability, processability), but the recycling process becomes complex and expensive due to the need to separate multiple materials
Solution Approach 1:
The patent applies homogeneity by using polyolefin materials with similar properties throughout the absorbent article structure. The topsheet, backsheet, and absorbent core are all made from polyolefin materials that can be separated by density, eliminating the need for complex multi-material separation processes while maintaining the desired functional characteristics
Solution Approach 2:
The patent segments the absorbent article into distinct components (topsheet, backsheet, absorbent core) that can be separately recovered and processed. Each component is made from polyolefin materials with different densities, enabling sequential separation through density-based recycling processes
2Ease of manufacture
If absorbent articles use conventional petrochemical materials, then the article achieves cost-effectiveness and desired performance characteristics, but the reliance on finite resources increases and environmental sustainability decreases
Solution Approach 1:
The patent changes the material parameter from conventional petrochemical polymers to bio-based polyolefin materials. This substitution maintains the cost-effectiveness and performance characteristics of traditional materials while reducing dependence on finite petroleum resources and improving environmental sustainability
3Reliability
If absorbent articles contain multiple recyclable and non-recyclable materials, then the article achieves functional performance, but the recycling operation becomes more complex and expensive with increased separation requirements
Solution Approach 1:
The patent ensures all materials in the absorbent article are polyolefin-based, creating a homogeneous material system that can be managed through a single recycling stream. This eliminates the complexity of separating recyclable from non-recyclable materials while maintaining functional performance through appropriate material selection in each component
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
Enhances recyclability by simplifying the separation process and decreases the demand for petroleum-based materials, aligning with consumer demand for sustainable and environmentally friendly products.
Implementation Method 1
The absorbent core typically comprises superabsorbent polymer particles that absorb and store the liquid bodily exudates
Implementation Method 2
an acquisition layer that temporarily stores liquid bodily exudates received from the topsheet before being received by the absorbent core
Data Source
AI summary
An absorbent article comprising a topsheet, a backsheet joined to the topsheet, and an absorbent core positioned intermediate the topsheet and the backsheet and comprising a core absorbent material, in which the core absorbent material comprises superabsorbent polymers with a bio-based content from about 5% to about 100% using ASTM D6866-10, method B and the absorbent article comprises a polyolefin content of at least about 90% by weight, based on a total weight of the absorbent article excluding the core absorbent material.