Corner Joint Moulding Seal for Mold-Resistant Waterproofing
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Solution Overview
Problem
Conventional caulking methods at the corner joints between horizontal and vertical structures, such as bathtubs and walls, are prone to mold buildup and fail to provide a reliable water-tight seal, especially when subjected to weight changes that can cause the seal to break.
Innovation Solution
A moulding with a rectangular base and integrally attached cap portion, secured using double-sided foam tape, is inserted into the gap between the structures, with a bead of caulking applied to the cap's inner face to create a flexible seal that remains water-tight even under weight changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional caulking alone is used at corner joints, then installation is simple, but the seal is prone to mold buildup and fails under weight changes
Solution Approach 1:
The sealing system is divided into distinct functional segments: the L-shaped moulding provides structural support and positioning, the double-sided foam tape provides adhesive bonding, and the caulking bead provides flexible sealing. This segmentation allows each component to optimize its specific function while working together to solve the overall sealing problem.
Solution Approach 2:
The invention combines multiple materials with different properties: rigid moulding material for structural stability, foam tape adhesive for strong bonding, and flexible caulking for sealing. This composite approach leverages the strengths of each material to achieve reliable sealing that resists mold and weight changes.
2Reliability
If flexible moulding is used to provide seal, then seal flexibility is improved, but the moulding pulls away from the wall under weight changes
Solution Approach 1:
The double-sided foam tape acts as an intermediary between the moulding and the horizontal surface, providing strong adhesive bonding that anchors the moulding in place. This mediator transfers loads effectively and prevents the moulding from pulling away, while still allowing the caulking to provide flexible sealing.
Solution Approach 2:
Different parts of the sealing system have different mechanical properties optimized for their specific functions: the moulding is rigid for structural stability, the foam tape is adhesive for bonding, and the caulking is flexible for sealing. This local optimization of material properties resolves the contradiction between flexibility and strength.
3Ease of manufacture
If caulking alone is used, then application is simple, but mold buildup occurs over time
Solution Approach 1:
The moulding structure extracts the moulding-prone surfaces from the sealing system by providing a rigid, non-porous framework that doesn't support mold growth. The caulking is confined to specific areas where it's most effective, rather than being applied broadly, reducing the surface area susceptible to mold.
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 provides a durable, water-tight seal that prevents mold buildup and maintains integrity under weight changes, offering a superior alternative to traditional caulking methods by combining the adhesive properties of foam tape with the flexibility of caulking.
Implementation Method 1
double sided foam tape extending the longitudinal dimension of the moulding with an upper surface of the foam tape adhered to an underside of the rectangular portion of the moulding
Implementation Method 2
a bead of caulking extending the longitudinal dimension of the moulding at an inner face of the upper lip below an upper tip thereof to form a flexible seal
Data Source
AI summary
A moulding for sealing a horizontal structure with a finishing layer of a vertical structure at a corner joint. In cross-section, the moulding has a rectangular base portion for insertion into a gap between the horizontal structure and the vertical finishing layer, and a cap portion with an upper lip for sealing against the finishing layer and a lower lip jutting downwardly for sealing against the horizontal structure. Double sided foam tape is applied only to an underside of the rectangular portion of the body. A bead of caulking at an inner face of the upper lip below an upper tip forms a flexible secondary seal of the moulding to the finishing layer of the vertical structure. While providing a secondary seal for maximum water-tightness, the caulking is protected from water exposure by the primary seal provided by the upper lip of the moulding to prevent mold build up.