Marine Hose PVA Release Layer for Reliable Leak Gap Formation
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Solution Overview
Problem
Existing marine hoses face challenges in reliably separating the inner reinforcing layer group from the outer reinforcing layer group to form a gap when the inner surface rubber layer is damaged, due to the limitations of polyethylene films used in the non-adhesive layer, which result in poor formability and increased manufacturing time.
Innovation Solution
A marine hose design incorporating a release layer primarily composed of PVA with a water dissolution temperature of 50° C. or higher, which effectively separates from the inner reinforcing layer group to form a gap, and includes a communication pipe and leak detector for fluid leakage detection, while minimizing thermal shrinkage and wrinkle formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyethylene film is used as the non-adhesive layer, then the releasability and separation capability are improved, but the thermal shrinkage increases causing difficulty in forming a wrinkle-free thin film
Solution Approach 1:
The patent changes the material parameter from polyethylene to PVA (polyvinyl alcohol), which fundamentally alters the thermal shrinkage characteristics. PVA exhibits minimal thermal shrinkage compared to polyethylene, allowing thin films to be formed without wrinkles while maintaining good separation capability. This material substitution resolves the contradiction between separation reliability and manufacturing precision.
2Reliability
If polyethylene film is used with large thermal shrinkage, then the separation function is achieved, but the manufacturing process requires large number of man-hours for careful winding
Solution Approach 1:
By changing the material from polyethylene to PVA, the thermal shrinkage parameter is significantly reduced. This allows the film to be wound more easily and quickly without requiring excessive manual intervention to prevent wrinkles, thereby improving manufacturing efficiency while maintaining reliable gap formation capability.
3Volume of moving object
If thin polyethylene film is used, then the layer structure is compact, but wrinkles and leakage occur due to large thermal shrinkage
Solution Approach 1:
The patent changes the material parameter from polyethylene to PVA, which has minimal thermal shrinkage. This allows thin films to be used without developing wrinkles during the winding and heating processes, maintaining both structural compactness and leakage prevention reliability.
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 PVA release layer ensures reliable gap formation and efficient fluid leakage detection, improving the quality and productivity of marine hoses by enhancing formability and reducing manufacturing time.
Implementation Method 1
The release layer is composed mainly of PVA and has a water dissolution temperature of 50° C. or higher
Implementation Method 2
A fluid leaking from a flow path on an inner side of the inner surface rubber layer flows through the gap and the communication pipe and reaches the leak detector
Data Source
AI summary
A marine hose includes an inner reinforcing layer group a release layer, and an outer reinforcing layer group layered in order from an inner circumferential side between an inner surface rubber layer and a cover layer. The release layer is composed mainly of PVA and the water dissolution temperature is set to 50° C. or higher. When the inner surface rubber layer and the inner reinforcing layer group are damaged, the release layer is separated from the inner reinforcing layer group to form a gap therebetween. A fluid leaking from a flow path on an inner side of the inner surface rubber layer flows through the gap and a communication pipe and reaches a leak detector disposed on a hose surface.