Waterproof Polyester Fabric Layering for Recyclability and Color Stability
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Solution Overview
Problem
Conventional waterproof moisture-permeable fabrics for clothing are difficult to recycle and often degrade in appearance due to dye migration, especially when using polyester films, which affects their recyclability and aesthetic quality.
Innovation Solution
A waterproof moisture-permeable fabric is designed with a colorless transparent polyester film and a white or gray resin layer containing inorganic particles, where the polyester fabric is predominantly made of recyclable polyester fibers, and the resin layer is partially stacked to enhance appearance and recyclability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a polyester film is stacked on a base fabric to facilitate recycling, then recyclability is improved, but dye migration occurs causing degradation of appearance
Solution Approach 1:
A release paper is introduced as an intermediary layer between the polyester film and the base fabric. This release paper prevents direct contact between the polyester film and dyed fabric, thereby preventing dye migration while maintaining the recyclability benefit of using polyester film. The release paper acts as a barrier that mediates the interaction between the two layers.
Solution Approach 2:
The waterproof moisture-permeable layer is divided into multiple functional layers: a polyester film layer for recyclability, a release paper layer for preventing dye migration, and optionally a resin layer for additional protection. This segmentation allows each layer to perform its specific function without interfering with others, resolving the contradiction between recyclability and appearance quality.
2Reliability
If a waterproof moisture-permeable layer is stacked on base fabric to protect the fabric, then durability is improved, but the structure becomes complex making recycling difficult
Solution Approach 1:
The invention uses a composite structure where a polyester film (waterproof moisture-permeable layer) is combined with a release paper layer. This composite material approach provides both durability (through the protective polyester film) and simplicity for recycling (through the use of polyester, which is easily recyclable, combined with a simple release paper layer).
Solution Approach 2:
The release paper serves as a simple intermediary layer that adds minimal structural complexity while enabling the polyester film to provide its protective function. This intermediary approach maintains durability without significantly increasing structural complexity, as the release paper is a simple, thin layer.
3Ease of manufacture
If a polyester film is used to improve recyclability, then ease of recycling is improved, but the film appears translucent causing color visibility issues
Solution Approach 1:
The release paper acts as an intermediary layer that provides opacity and color coverage, preventing the translucent polyester film from showing through. This maintains the color visibility and aesthetic appearance while preserving the recyclability advantage of the polyester film.
Solution Approach 2:
Different layers are assigned different functional qualities: the polyester film provides waterproof moisture-permeable properties and recyclability, while the release paper provides opacity and color coverage. This local differentiation of qualities allows each layer to excel at its specific function without compromising overall performance.
Data Source
AI summary
Waterproof moisture-permeable fabric for clothing which includes, on one side of a polyester fabric A, a waterproof moisture-permeable layer B including a colorless transparent polyester film stacked, and a white or gray resin C partially stacked, and clothing including the waterproof moisture-permeable fabric. Preferably, a moisture-permeable polymer resin D containing inorganic fine particles is stacked on the waterproof moisture-permeable layer B, and the white or gray resin C is partially stacked thereon.