Flexible Pipe Wrapped Reinforcement Hot-Melt Adhesion
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Solution Overview
Problem
Current multilayer pipes with wrapped textile reinforcement face limitations in pressure and temperature resistance, particularly below 30 bars and 50°C, and existing solutions like braided reinforcement have discontinuous manufacturing processes and high weight, while conventional wrapped pipes struggle with adhesion and mesh size constraints.
Innovation Solution
A flexible pipe structure with a covered reinforcement interposed between internal and external layers, using hot-melt adhesive to increase adhesion and reduce the effective free surface of the internal layer, allowing for reduced mesh size and enhanced pressure resistance, manufactured through a continuous process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the effective free surface of the internal layer is reduced to improve pressure resistance, then the adhesion between layers decreases, but the reinforcement stability is compromised
Solution Approach 1:
A hot-melt adhesive layer is introduced as an intermediary between the internal layer and the wrapped reinforcement. This adhesive layer compensates for the reduced adhesion caused by decreasing the effective free surface area, allowing the reinforcement to remain stable even when the mesh size is reduced for high-pressure applications.
Solution Approach 2:
The invention changes the physical and chemical parameters of the interface between layers by using hot-melt adhesive with specific properties (viscosity, bonding strength, temperature resistance). This allows the system to maintain reliable adhesion even when the geometric parameter of effective free surface is reduced below conventional limits.
2Strength
If braided reinforcement is used to achieve high pressure and temperature resistance, then the strength increases, but the manufacturing process becomes discontinuous and weight increases
Solution Approach 1:
Instead of using traditional braided reinforcement that requires discontinuous manufacturing, the invention inverts the approach by using wrapped reinforcement with hot-melt adhesive bonding. This allows the adoption of continuous extrusion and wrapping processes while achieving comparable or superior pressure and temperature resistance.
Solution Approach 2:
The invention creates a composite structure combining wrapped reinforcement with hot-melt adhesive layers. This composite approach enables the use of continuous manufacturing processes for both the plastic layers and the reinforcement, while the adhesive ensures structural integrity under high pressure and temperature conditions.
3Strength
If two covered reinforcements are used to improve pressure resistance, then the strength increases, but the manufacturing process becomes discontinuous and wire weight increases
Solution Approach 1:
The invention extracts the essential function of multi-layer reinforcement (pressure resistance) and implements it through a single wrapped reinforcement layer bonded with hot-melt adhesive. This eliminates the need for multiple heavy wire layers while maintaining the required strength, thereby reducing overall wire weight.
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 pipe achieves high operating pressures greater than 250 bars and high temperatures with sufficient adhesion, enabling continuous manufacturing and improved resistance to pressure while maintaining stability.
Implementation Method 1
the reinforcement is placed between two layers of hot-melt adhesive to adhere to the internal and external layers
Data Source
Figure 1
AI summary
The invention relates to a flexible pipe (1) with a wrapped reinforcement, as well as to a related production method, wherein according to the invention the flexible pipe with a wrapped reinforcement comprises at least one inner layer (2) and one outer layer (3), and a wrapped reinforcement (4) inserted between the inner (2) and outer (3) layers such that said reinforcement (4) is provided between two hot-melt glue layers (5a, 5b) for adhering to the inner (2) and outer (3) layers, and such that the effective free surface of the inner layer (2) is between 20 and 130 cm2 per linear meter of the pipe (1).