Multi-Layer Drain Seal with Segmented Bonding
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Solution Overview
Problem
Existing drain sealing devices, such as mats made of polymeric materials, face issues like excessive creep or sag that impede sealing efficiency, susceptibility to tearing, incorrect usage due to lack of internal structure, and difficulties in handling and reuse, particularly in emergency situations where quick and universal sealing of various grate designs is required.
Innovation Solution
A multi-layer drain sealing device with a lower layer of polyurethane elastomer for flexibility and a higher, more durable PVC layer for protection, connected at discrete points to allow for creep and sag without restriction, providing improved sealing efficiency and durability while minimizing adhesion and UV damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a soft, flexible polymeric layer is used for sealing against the grate, then sealing efficiency is improved, but the material becomes susceptible to tearing and lacks structural integrity
Solution Approach 1:
The patent applies composite materials by combining a soft, flexible polymeric sealing layer with a reinforcing scrim or mesh structure. The polymeric layer provides the necessary flexibility and conformability to seal against various grate surfaces, while the embedded scrim or mesh reinforces the material to prevent tearing and improve structural integrity during handling and deployment.
2Ease of operation
If a removable cover layer is added to prevent adhesion and debris accumulation, then storage and reuse are improved, but device complexity and handling time increase
Solution Approach 1:
The patent extracts the cover layer function by providing a separate, removable protective covering that can be detached from the sealing mat. This allows the sealing surface to remain exposed and adhesive-free during storage, preventing both material adhesion and debris accumulation, while the cover itself can be easily stored separately or attached via simple means such as clips or Velcro.
3Strength
If the upper structural layer is coextensively joined to the lower sealing layer, then strength is improved, but sealing efficiency is impeded due to restricted creep and sag
Solution Approach 1:
The patent segments the bonding between layers by providing localized bonding zones rather than coextensive joining. The reinforcing scrim or mesh is bonded to the polymeric sealing layer at discrete points or in specific regions, allowing the sealing layer to creep and sag freely in areas where bonding is absent, thereby maintaining sealing efficiency while still providing structural reinforcement where needed.
4Strength
If a dense, rigid polymeric layer is used for strength, then durability is improved, but flexibility and ability to conform to grate apertures are reduced
Solution Approach 1:
The patent applies local quality by providing different material properties in different regions of the sealing device. The polymeric sealing layer is formulated with specific viscoelastic properties that allow it to creep and conform to grate apertures under its own weight, while the embedded reinforcing scrim or mesh provides localized structural support and prevents excessive deformation or tearing in high-stress areas.
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 solution enables effective sealing of various grate designs with improved durability and ease of use, reducing the risk of tearing and incorrect usage, while allowing for easy handling and reuse, and providing enhanced protection against UV degradation.
Implementation Method 1
the semi-rigidity of the polymeric material provides a suitable amount of creep or sag such that the layer will conform to the apertures in the grate to be sealed
Implementation Method 2
the lower sealing layer conforms and seals against the grate and the surrounding frame, roadway or floor slab
Data Source
AI summary
A multiple layer drain seal device for rapidly sealing the apertures in a drain grate, the drain seal having a lower sealing layer and an upper protective cover layer, the lower sealing layer being separable from the upper protective cover layer except at discrete attachment points, wherein the lower sealing layer is softer, more flexible and has lower shear resistance than the upper protective cover layer, such that the lower sealing layer sags into the drain grate apertures but the upper protective cover layer does not.