Flyknit Bag with Variable Layer Density for Bending and Load
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Solution Overview
Problem
Conventional materials for making bags, such as animal leather, artificial leather, and nylon cloth, face issues like animal cruelty, aging, susceptibility to damp, and environmental pollution, while marine yarn, though durable and eco-friendly, is difficult to bend and not suitable for carrying heavy items due to its extensibility and multi-layer structure.
Innovation Solution
A knitted bag made using a flyknit technique with a main body sheet substrate having a multi-layer structure, where the number of fabric layers is reduced at bent regions to facilitate easier bending and sewing, and a combination of nylon thermal fuses and marine yarns is used to enhance durability and shape retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If marine yarn is knitted into a multi-layer fabric structure to ensure service life, then durability is improved, but the fabric becomes difficult to bend and requires huge amounts of effort to manufacture small-sized bags
Solution Approach 1:
The patent applies local quality by creating different fabric structures in different regions: the main body uses a multi-layer structure for durability, while the bent regions use a single-layer structure for ease of bending. This is achieved by selectively forming single-layer regions at predetermined bent positions during the knitting process, allowing each part of the fabric to have the appropriate properties for its function.
2Adaptability or versatility
If marine yarn is used to make fabric cloth with excellent ductility, then the material becomes easy to elongate under tensile force, but it is not suitable for making bags that need to bear various tensile forces
Solution Approach 1:
The patent resolves this contradiction by applying local quality differently to different regions: the main body maintains a multi-layer structure to provide high tensile strength for bearing loads, while the bent regions use a single-layer structure to provide ductility for shaping. This spatial differentiation allows the fabric to exhibit both strength and ductility where needed.
3Ease of manufacture
If conventional materials like animal leather, artificial leather, or nylon cloth are used to make bags, then ease of manufacture is improved, but environmental pollution and other negative effects occur
Solution Approach 1:
The patent applies parameter changes by transforming the material composition parameter - using marine yarn (made from recycled plastic bottles) instead of conventional materials. This material substitution changes the environmental impact parameter while maintaining manufacturability through the flyknit technique, which efficiently produces the complex multi-layer/single-layer fabric structure.
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 simplifies the manufacturing process, allows the bag to easily bend and maintain its shape, and effectively bear heavy loads, while maintaining an eco-friendly and durable material composition.
Implementation Method 1
The main body sheet substrate is a sheet-like fabric knitted from nylon thermal fuses and marine yarns
Data Source
AI summary
A knitted bag made by a fly-knit technique is provided in which the knitted bag includes a main body formed by a main body sheet substrate knitted at one time by a fly-knit loom. Moreover, the main body sheet substrate is constructed to be directly sewed into a predetermined shape of the bag after a process of hand stitching and bending. The main body sheet substrate has a multi-layer sheet structure, and the number of layers of fabric of the main body sheet substrate in at least a portion of bent regions is smaller than the number of layers of fabric in other regions.