Core-Sheath Composite Fiber for Stable Surface Potential
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Solution Overview
Problem
Conventional resin-based electret fibers face issues with charge neutralization and difficulty in achieving dense charging or maintaining a consistent positive or negative surface potential due to mixed charges.
Innovation Solution
A composite fiber with a core sheath-structure, where the core is made of a metal or electrically conductive material and the sheath is a ceramic component, allowing for GND-connection to achieve a dense and consistent positive or negative surface potential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resin fiber is electretized by corona discharge, then the fiber can be charged, but the charges easily disappear over time due to neutralization
Solution Approach 1:
The fiber is divided into core and sheath portions with different material compositions. The core portion contains polar polymer groups that can maintain charges, while the sheath portion provides structural support. This segmentation allows different regions to perform different functions: charge storage and structural integrity.
Solution Approach 2:
Different portions of the fiber have different polar polymer group contents. The core portion has a higher content of polar polymer groups compared to the sheath portion, creating local quality differences that enable the core to retain charges more effectively while the sheath provides mechanical strength.
2Reliability
If a core sheath type composite fiber with two different resin components is electretized, then the fiber can be charged, but positive and negative charges are mixed on the surface making it difficult to densely charge the fiber
Solution Approach 1:
The core portion is designed with a higher content of polar polymer groups than the sheath portion, creating a local quality difference. This concentration of polar groups in the core enables more effective charge retention and allows for better control of charge polarity, as the polar regions preferentially attract and hold charges of the same polarity.
Solution Approach 2:
The fiber uses a composite structure with a core portion containing a first polymer and a sheath portion containing a second polymer, where at least one of them has polar polymer groups. This composite material approach allows optimization of charge retention in the core while maintaining structural integrity through the sheath.
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 composite fiber enables dense charging and maintains a stable positive or negative surface potential, improving electrical characteristics by preventing charge neutralization and allowing control over polarity and magnitude.
Implementation Method 1
a core portion (1) and a sheath portion (2)... wherein the core portion comprises a metal or an electrically conductive material
Implementation Method 2
a sheath portion (2) made of a ceramic component covering the core portion (1)
Data Source
AI summary
A composite fiber having a core sheath-structure that includes a core portion having an electrically conductive material, and a sheath portion having a ceramic component covering the core portion. The composite fiber is constructed such that, when the core portion is connected to a ground, the sheath portion exhibits one of a positive surface potential or a negative surface potential over an entire surface of the sheath portion.