Multi-core Cable Sheath Coating for Chemical Resistance
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Solution Overview
Problem
Conventional multi-core cables with sheaths made of PVC, polyurethane, or silicone suffer from chemical resistance issues and flexibility loss over time, especially in medical device applications where ultrafine cables are needed.
Innovation Solution
A multi-core cable design featuring a sheath coated with polyparaxylylene or fluorine resin in a thickness of 0.5 μm to 3.0 μm, which enhances chemical resistance and maintains high flexibility and peeling resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sheath materials such as PVC, polyurethane, or silicone are used, then the cable can be manufactured with basic flexibility, but the chemical resistance deteriorates and the cable becomes discolored or altered by temporal change due to chemicals
Solution Approach 1:
The patent applies composite materials by combining a resin material base (such as PVC, polyolefin, polyurethane, or silicone) with a coating layer of polyparaxylylene or fluorine resin. This composite structure provides both the mechanical properties of the resin base and the superior chemical resistance of the coating layer, preventing discoloration and alteration while maintaining flexibility.
Solution Approach 2:
The patent changes the parameter of the sheath material by applying a coating layer with specific thickness (0.5 μm to 3.0 μm) of polyparaxylylene or fluorine resin. This parameter change transforms the conventional sheath into a chemically resistant structure without sacrificing the underlying resin's flexibility and mechanical properties.
2Reliability
If the sheath is coated with a thick coating layer to improve chemical resistance, then chemical resistance improves, but flexibility deteriorates
Solution Approach 1:
The patent optimizes the thickness parameter of the coating layer to a specific range (0.5 μm to 3.0 μm). This parameter optimization ensures sufficient chemical resistance while maintaining the flexibility of the cable, as the coating is thin enough not to significantly restrict bending and movement.
Solution Approach 2:
The patent applies local quality by providing a thin protective coating only on the outer surface of the sheath where chemical exposure occurs, while the inner bulk material retains its original flexibility. This localized application of protective properties ensures chemical resistance at the surface without compromising the overall flexibility of the cable.
3Ease of operation
If the coating layer thickness is reduced to maintain flexibility, then flexibility is maintained, but peeling resistance deteriorates
Solution Approach 1:
The patent identifies and applies a critical thickness range (0.5 μm to 3.0 μm) for the coating layer. Within this range, the coating is thin enough to maintain flexibility but thick enough to provide sufficient adhesion and peeling resistance. This parameter optimization balances both requirements simultaneously.
Solution Approach 2:
The patent applies a coating thickness that is partially sufficient for chemical resistance but not excessively thick. The coating thickness of 0.5 μm to 3.0 μm provides just enough protective function while avoiding the excessive thickness that would cause peeling or flexibility loss, achieving optimal balance through partial action.
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 cable exhibits improved chemical resistance and flexibility, with the coating layer resisting peeling even under extensive bending and chemical exposure, ensuring a long lifespan.
Implementation Method 1
the sheath is configured by a resin material coated with polyparaxylylene or fluorine resin in a thickness of 0.5 μm to 3.0 μm... improvements on the chemical resistance
Implementation Method 2
the peeling resistance of the coating layer are favorable... the coating layer resisting peeling even under extensive bending and chemical exposure
Data Source
AI summary
A multi-core cable includes a plurality of coaxial wires, each coaxial wire including a center conductor whose sectional area is 0.0006 mm2 to 0.25 mm2, a wrapping tape configured to cover all of the plurality of coaxial wires, and a sheath configured to cover the wrapping tape. The sheath is configured by a resin material coated with polyparaxylylene or fluorine resin in a thickness of 0.5 μm to 3.0 μm.