Fadable Multifunctional Monofilament Having a Core-Shell Structure
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Solution Overview
Problem
Existing methods for producing fadable multifunctional monofilaments with functional fillers or active substances result in significant loss of these components during the dyeing process, limiting their comprehensive performance.
Innovation Solution
A core-shell structured monofilament design is employed, where the functional filler or active substance is incorporated into the core layer, and a shell layer with a thickness of at least 10 μm is used to minimize loss during dyeing, achieved through a co-extrusion spinning process and specific dyeing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a dyeing process is used to prepare fadable monofilaments, then the monofilaments can achieve fading function, but the functional fillers or active substances are lost during the dyeing process
Solution Approach 1:
The monofilament is divided into core and shell layers, with the core containing functional fillers or active substances and the shell providing protective enclosure. This segmentation allows the dyeing process to affect the shell for fading function while preserving the core materials.
Solution Approach 2:
The core layer containing functional fillers or active substances is nested within the shell layer, creating a core-shell structure. This nesting protects the sensitive core materials from loss during dyeing while allowing the outer shell to undergo the dyeing process for fading functionality.
2Adaptability or versatility
If functional fillers or active substances are added to monofilaments, then multifunctional characteristics are achieved, but loss of these substances occurs during dyeing
Solution Approach 1:
The monofilament is segmented into core and shell regions, concentrating functional fillers or active substances in the core while the shell handles the dyeing process. This segmentation preserves multifunctional characteristics by protecting core materials from loss during dyeing.
Solution Approach 2:
The core containing functional materials is nested within the protective shell, allowing the monofilament to maintain multifunctional characteristics while the shell undergoes dyeing without causing significant loss of core substances.
3Loss of substance
If the shell layer thickness is increased to reduce loss of functional fillers or active substances, then retention is improved, but manufacturing complexity increases
Solution Approach 1:
A thin shell layer with optimized thickness is used to provide sufficient protection against loss of functional fillers or active substances during dyeing, while maintaining manufacturing feasibility through co-extrusion processes that can handle thin-walled structures.
Solution Approach 2:
The shell layer thickness is optimized to a specific range that balances protective function with manufacturing complexity. This parameter optimization allows the core-shell structure to reduce substance loss effectively while remaining compatible with standard co-extrusion manufacturing processes.
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 core-shell structure effectively retains a higher percentage of functional fillers or active substances post-dyeing, enhancing the multifunctional characteristics of the monofilaments.
Implementation Method 1
the functional filler or the active substance is incorporated into the core layer, and by specifically defining the thickness parameter of the shell layer
Implementation Method 2
converging the above two melts in a co-extrusion spinning pack, after extruding from a spinneret hole, cooling and solidifying the converged melt
Data Source
AI summary
The present invention relates to a fadable multifunctional monofilament. More particularly, the present invention relates to a fadable multifunctional monofilament having a core-shell structure comprising an active substance(s) or a functional filler(s). The present invention also relates to a method for preparing the monofilament material, and a use of the monofilament material in a brush material such as a toothbrush.