Multilayer Underfloor Heating Pipe for Bendability Under Pressure
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Solution Overview
Problem
Underfloor heating pipes face challenges in flexibility and durability, as thick walls hinder installation in tight bends and thin walls fail to withstand fluid pressure, leading to potential damage and leakage.
Innovation Solution
A multi-layered underfloor heating pipe design comprising a tubular inner layer, adhesive layers with up to 10% colourant, an oxygen-barrier layer, and an outer layer, with specific thickness ranges for each layer, allowing for increased flexibility and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the pipe wall is made thick to withstand fluid pressure, then the pipe can resist pressure and prevent leakage, but the pipe becomes difficult to bend and cannot be installed in tight bends
Solution Approach 1:
The pipe wall is divided into multiple discrete layers (inner layer, intermediate adhesive layer, outer layer) rather than being a single thick wall. This segmentation allows each layer to contribute differently to the overall properties, enabling flexibility while maintaining pressure resistance through the combined structure.
Solution Approach 2:
The pipe uses a composite structure combining different materials with distinct properties: an inner layer for pressure resistance, an adhesive layer for bonding and flexibility, and an outer layer for protection. This composite approach allows the pipe to simultaneously achieve bendability and pressure resistance that a single-material thick wall cannot provide.
2Ease of operation
If the pipe wall is made thin to allow easy deformation and bending, then the pipe can be installed in tight bends, but the pipe cannot withstand fluid pressure and may be damaged by screed and flooring
Solution Approach 1:
The pipe wall is segmented into multiple layers where the thin outer and inner layers provide flexibility for bending, while the intermediate adhesive layer provides structural support and pressure resistance. This segmentation allows thin walls to achieve both bendability and strength.
Solution Approach 2:
The composite structure combines thin flexible layers with an adhesive bonding layer, creating a pipe that is both easily deformable for installation in tight bends and sufficiently strong to withstand fluid pressure and protect against damage from screed and flooring.
3Illumination intensity
If the adhesive layer contains high percentage of colourant to provide visual indication, then the colour intensity increases, but the flexibility of the pipe decreases
Solution Approach 1:
The colourant is concentrated in the adhesive layer rather than distributed throughout the entire pipe wall. This local placement of colourant provides visual indication where needed (in the visible adhesive layer) without compromising the flexibility of the structural pipe layers.
Solution Approach 2:
The patent specifies a controlled percentage range of colourant (up to 10% by weight) in the adhesive layer, optimizing the balance between colour intensity for visual indication and flexibility for installation. This parameter control ensures the adhesive maintains adequate flexibility while providing sufficient colour.
Data Source
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AI summary
An underfloor heating pipe (10) having a tubular pipe inner layer (14), a first adhesive layer (16), an oxygen-barrier layer (18), a second adhesive layer (20) and an outer layer (22). The first adhesive layer (16) and the second adhesive layer (20) each have a thickness in the range of 0.048 mm to 0.072 mm, the first and second adhesive layers (20) being formed from an adhesive and a colourant wherein a percentage of the colourant in each of the first and second adhesive layers (20) is up to 10% by weight. The oxygen-barrier layer (18) has a thickness in the range of 0.048 mm to 0.072 mm. The outer layer (22) has a thickness in the range of 0.24 mm to 0.36 mm.