Pipe Liner Sealing Sheet to Prevent Curing Shrinkage Leaks
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Solution Overview
Problem
Existing methods for renovating and repairing liquid-conducting systems, such as drain and water pipes, face issues with leakage due to shrinkage of the liner during the curing process, which can be exacerbated by variations in temperature and pressure.
Innovation Solution
The application of an adhesive sealing sheet between the wall portion and the liner, which can be double-sided with a foamed substrate layer, enhances adhesion and compensates for surface variations, reducing the risk of leakage and liner shrinkage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a liner is applied to renovate a liquid-conducting system, then the pipe structure is restored and sealed, but shrinkage during curing may cause leakage
Solution Approach 1:
An adhesive sealing sheet is introduced as an intermediary layer between the liner and the pipe wall. This sealing sheet maintains constant adhesion during the curing process, preventing the liner from shrinking away from the pipe wall and eliminating leakage paths that would otherwise form due to dimensional instability.
Solution Approach 2:
The adhesive sealing sheet is applied to the pipe wall before the liner is installed. This preliminary action ensures that the sealing interface is prepared in advance, creating a stable bonding surface that will maintain contact between the liner and pipe wall throughout the subsequent curing process, even as the liner undergoes dimensional changes.
2Duration of action of stationary object
If temperature and pressure variations occur during curing, then the curing process completes, but liner shrinkage increases causing leakage
Solution Approach 1:
The adhesive sealing sheet serves as a cushioning element that compensates for the effects of temperature and pressure variations during curing. By providing continuous adhesive bonding, it cushions against the dimensional changes and shrinkage that occur under varying thermal and pressure conditions, preventing leakage throughout the curing duration.
3Strength
If the liner is inflated and heated to conform to pipe walls, then adhesion is improved, but shrinkage risk increases during curing
Solution Approach 1:
The adhesive sealing sheet acts as a mediator that decouples the adhesion function from the structural liner. The sealing sheet maintains the adhesive bond between the liner and pipe wall without requiring the liner itself to maintain perfect dimensional stability, thus allowing the liner to be inflated and heated for conformability without transferring shrinkage risks to the seal integrity.
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 method effectively reduces the risk of leakage and ensures a secure seal by improving adhesion between the liner and the wall, even in the presence of pressure variations, thereby ensuring a smooth and efficient renovation process.
Implementation Method 1
a first adhesive surface of the adhesive sealing sheet causes the adhesive sealing sheet to adhere to the wall portion
Implementation Method 2
which can be double-sided with a foamed substrate layer
Data Source
Figure 1a~1d
Figure 2a~2c
Figure 3a~3c
AI summary
A method of renovating a liquid-conducting system (2, 3) comprises providing a liner (41, 42), applying the liner (41, 42) to at least a wall portion (20, 31, 32, 33) of the liquid-conducting system, and causing the liner (41, 42) to conform to a wall portion shape. The method further comprises applying an adhesive sealing sheet (100, 100', 100", 110, 110', 110") to at least a portion of the wall portion (20, 31, 32, 33) of the liquid-conducting system, such that a first adhesive surface (51) of the adhesive sealing sheet (100, 100', 100", 110, 110', 110") causes the adhesive sealing sheet to adhere to the wall portion (20, 31, 32, 33). The adhesive sealing sheet (100, 100', 100", 110, 110', 110") is arranged between the wall portion (20, 31, 32, 33) and the liner (41, 42).