Shielded Electric Wire With Adhesive Sheet For Moisture Sealing
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Solution Overview
Problem
Conventional shielded electric wires with water-stopping functions suffer from unstable airtightness due to manual kneading of elastic bodies like butyl rubber, leading to inconsistent water-blocking performance.
Innovation Solution
A shielded electric wire design featuring a viscoelastic body between electric wires and a shielding member, covered by a sheet member with adhesive layers, ensuring a minimum adhesion force and width of the pasted portions to effectively prevent moisture ingress, and a protecting member for enhanced stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual kneading of elastic body is used to achieve water stopping, then the water blocking function is provided, but the airtightness quality becomes unstable
Solution Approach 1:
The patent replaces the manual mechanical kneading process with an automated adhesive application system. Adhesive layers are precisely applied to the sheet member in predetermined patterns, eliminating the variability of manual elastic body kneading and achieving consistent airtightness quality through controlled adhesive bonding.
Solution Approach 2:
The patent changes the physical state and application method from manually kneaded elastic body to pre-applied adhesive layers. The adhesive is applied in controlled amounts with specific width and positioning, transforming the water stopping mechanism from dependent on manual skill to dependent on controlled material parameters.
2Manufacturing precision
If adhesive layers are applied to sheet member, then the airtightness is improved, but the manufacturing complexity increases
Solution Approach 1:
The sheet member is divided into multiple segments with adhesive layers applied at specific locations rather than covering the entire surface. This segmentation approach achieves effective airtightness at critical interfaces while reducing the total amount of adhesive and simplifying the manufacturing process compared to full-surface coating.
Solution Approach 2:
Adhesive layers are applied with different widths and at different positions on the sheet member based on local requirements. The adhesive application is concentrated at edges and interfaces where water intrusion risk is highest, providing targeted protection without unnecessary complexity elsewhere.
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 design achieves a more stable and higher airtightness in shielded electric wires, suitable for environments exposed to rainwater, with a pullout load of at least 8 N, ensuring reliable moisture suppression and improved durability.
Implementation Method 1
adhesive layers are formed on one surfaces of the first and second sheet members respectively, and are pasted onto the shielding member and onto the viscoelastic body
Implementation Method 2
a viscoelastic body attached between end portions of the plurality of electric wires and the shielding member
Data Source
AI summary
A shielded electric wire includes electric wires, a shielding member that covers peripheries of the electric wires, a viscoelastic body that covers the peripheries of the electric wires, a sheet member having first and second sheet member covering peripheries of the shielding member and the viscoelastic body, and a protecting member provided around the sheet member. The first and second sheet members are pasted onto the shielding member and the viscoelastic body so that a pasted portion protruding in a width direction is formed. A force of adhesion of the viscoelastic body to the plurality of electric wires and the adhesive layers of the first and second sheet member is not less than 0.59 N/10 mm. A force of adhesion of the adhesive layers of the first and second sheet members to the viscoelastic body is not less than 0.59 N/10 mm.