Adhesive Tape Insulation Winding Balance
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Solution Overview
Problem
Adhesive tapes used for repairing power cables in harsh oil field environments face challenges in achieving a balance between insulating properties and ease of winding, often resulting in wrinkles and gaps that decrease the reliability of the repaired portion.
Innovation Solution
An adhesive tape with a specific combination of substrate and adhesive layer characteristics, where the breakdown voltage and initial elastic modulus satisfy a particular inequality, allowing for lower minimum winding load and improved winding properties without wrinkles or gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive tape with high insulating properties is used, then breakdown voltage increases, but winding properties deteriorate causing wrinkles and gaps
Solution Approach 1:
The patent applies parameter changes by precisely controlling the initial elastic modulus Y and breakdown voltage X to satisfy the inequality Y ≤ 4.5X - 22.5. This quantitative parameter optimization allows the adhesive tape to achieve both high insulating properties and good winding properties, resolving the contradiction between reliability and ease of operation.
Solution Approach 2:
The patent uses composite materials by combining a polyolefin resin substrate with a specific adhesive layer. This composite structure enables the tape to simultaneously achieve high breakdown voltage (insulating properties) and appropriate elasticity (winding properties), resolving the contradiction between reliability and ease of operation.
2Reliability
If adhesive tape with excellent heat resistance and chemical resistance is used, then reliability in harsh environment improves, but winding ease deteriorates
Solution Approach 1:
The patent applies parameter changes by selecting polyolefin resin as the substrate material, which inherently provides excellent heat resistance and chemical resistance for harsh oil field environments. Combined with precise control of the initial elastic modulus and breakdown voltage relationship, the tape achieves both high reliability in harsh environments and good winding ease.
Solution Approach 2:
The patent uses composite materials by combining a polyolefin resin substrate (providing heat and chemical resistance) with a specifically formulated adhesive layer. This composite structure enables the tape to simultaneously achieve excellent environmental resistance and appropriate flexibility for easy winding, resolving the contradiction between reliability and ease of operation.
3Manufacturing precision
If higher tension is applied during winding, then wrinkles and gaps are reduced, but winding load increases
Solution Approach 1:
The patent applies parameter changes by optimizing the initial elastic modulus Y to satisfy the inequality Y ≤ 4.5X - 22.5. This parameter optimization allows the adhesive tape to achieve high winding precision (reduced wrinkles and gaps) while requiring lower winding load, as the material's elastic properties enable it to conform to the cable surface with minimal applied force.
Data Source
AI summary
The adhesive tape of the present disclosure includes: a substrate; and an adhesive layer disposed on one surface of the substrate. In the adhesive tape of the present disclosure, when a breakdown voltage in a thickness direction of the adhesive tape is represented as X (unit: kV) and an initial elastic modulus evaluated from a stress-strain curve in a tensile test is represented as Y (unit: N/mm), an inequality Y ≤ 4.5X -22.5 is satisfied. The adhesive tape of the present disclosure has an excellent balance between insulating properties and winding properties in winding work.