Non-PVC Cable Seal Adhesion via Surface Preparation
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Solution Overview
Problem
Achieving a tight and sealed connection between cables with non-PVC outer jackets, such as XLPE, and polyurethane sealants is challenging due to poor adhesion, making it difficult to manufacture a reliable and cost-effective cable seal that provides good water sealing.
Innovation Solution
The method involves preparing the non-PVC cable jackets through chemical, mechanical, or additional means to promote adhesion, such as applying tapes or heat shrinkable sleeves with adhesives, and using polyurethane sealants to create a watertight overmolded seal, including the use of plasma treatment and solvents to enhance surface compatibility and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polyurethane sealant is applied directly to non-PVC cable jackets, then the sealing process is simple, but adhesion is poor and sealing reliability is compromised
Solution Approach 1:
The patent introduces an intermediary layer (adhesive promoter or primer) between the non-PVC cable jacket and the polyurethane sealant. This intermediary material improves adhesion by chemically or physically bonding to both surfaces, resolving the contradiction between simple application process and reliable sealing.
Solution Approach 2:
The patent modifies surface parameters of the non-PVC cable jacket through treatment processes (such as plasma treatment, corona discharge, or chemical etching) to increase surface energy and improve wettability. This allows the polyurethane sealant to adhere properly without complicating the overall manufacturing process.
2Reliability
If outer jacket preparation is performed to promote adhesion, then sealing reliability improves, but manufacturing complexity increases
Solution Approach 1:
The patent applies adhesive promoters or primers as a preliminary step before sealant application. This preliminary action prepares the surface in advance, ensuring reliable adhesion while keeping the subsequent sealant application simple and straightforward.
Solution Approach 2:
The patent replaces complex mechanical surface preparation methods with chemical or physical field-based treatments (such as plasma or corona discharge) that can be applied automatically and uniformly, reducing manual intervention and process complexity while improving adhesion reliability.
3Productivity
If standard overmolding is used on non-PVC cables, then production efficiency is high, but water sealing performance is insufficient
Solution Approach 1:
The patent uses an intermediary adhesive layer that not only improves bonding but also creates a water-resistant barrier between the non-PVC cable jacket and the polyurethane sealant, preventing water penetration while maintaining efficient production through a streamlined multi-layer application process.
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
This approach ensures a 100% waterproof and mechanically resistant seal, reducing material costs and improving adhesion between non-PVC cable jackets and polyurethane sealants, applicable to both single cables and bundles, with enhanced flexibility and resistance to chemicals, oils, acids, and temperature.
Implementation Method 1
heat shrinking the sleeve
Implementation Method 2
with an adhesive between the heat shrinkable sleeve and the outer jacket
Implementation Method 3
overmolding the sleeve and an adjacent region of the outer jacket with a sealant
Data Source
Figure 1~5
Figure 6~7
AI summary
A method of manufacturing a cable seal is provided, the method comprising the steps of: providing a cable having a protective outer jacket of a non-PVC material; preparation of the protective outer jacket of the cable such as to promote adhesion with a sealant; and overmolding the outer jacket with a sealant. As a result, a sealing interface is formed between the jacket and the sealant.