Modular Shower Pan Structure for Uniform Cooling and Curb Attachment
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Solution Overview
Problem
Existing prefabricated shower modules face issues with uneven cooling during manufacturing, leading to bowing and warping, which affects the pitch and integrity of the shower surface, and limited design options due to the need for specific molds for each size, restricting customization and increasing production costs.
Innovation Solution
The use of polyurethane reaction injection molding with support ribs and a contoured drain wall design to ensure uniform cooling and integration of a modular curb system, allowing for varying sidewall heights and surfaces, and the ability to attach a prefabricated curb to the shower module, enabling faster production and increased design flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If prefabricated shower modules are manufactured using traditional molding processes, then production speed increases, but uneven cooling causes bowing and warping that affects surface integrity and pitch
Solution Approach 1:
The shower module is divided into multiple independently molded sections that are later joined together. This segmentation allows each section to cool uniformly independently, preventing bowing and warping, while the sections are connected using interlocking joints with sealing mechanisms to maintain surface integrity and pitch uniformity across the entire module.
Solution Approach 2:
The design incorporates nested drainage components where the drain assembly is integrated within the molded structure. The drainage system is nested within the shower floor cavity, allowing the floor to be molded as a single piece with the drain already positioned, eliminating post-molding assembly steps that could compromise surface flatness while maintaining production speed.
2Manufacturing precision
If specific molds are used for each shower module size, then manufacturing precision is maintained, but production time increases and design flexibility is limited
Solution Approach 1:
A universal base mold design is implemented that can accommodate multiple shower module sizes and configurations through adjustable positioning systems and interchangeable inserts. The mold includes a standardized cavity structure that can be reconfigured to produce different sizes of shower modules without requiring complete mold changes, thereby maintaining dimensional accuracy while reducing changeover time and increasing design flexibility.
3Manufacturing precision
If thick mortar layers are applied to form sloped shower floors, then proper drainage pitch is achieved, but curing time increases significantly
Solution Approach 1:
The drainage pitch and floor slope are pre-formed during the molding process itself. The mold cavity is designed with the exact slope required for proper drainage, so when the shower module is removed from the mold, the sloped surface is already in place. This eliminates the need for applying and curing thick mortar layers to create the slope, thereby maintaining precise drainage pitch while dramatically reducing the time required before the shower can be installed and used.
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
This approach reduces production time, minimizes waste, and offers more design options for shower modules, ensuring a leak-proof and uniformly pitched surface, while maintaining the integrity of the shower enclosure system.
Implementation Method 1
After filling the mold with the resin, the module must cool (e.g., solidify) before being removed
Implementation Method 2
If the module is removed before it is completely solid, bowing may occur as the module hardens
Data Source
AI summary
A prefabricated, polyurethane reaction injection molded, leak-proof shower module suitable for use in constructing a tiled shower includes a floor and a plurality of sidewalls wherein a first sidewall is taller than at least a portion of a second sidewall and the difference in height between the first sidewall and the second sidewall is sufficient to permit the attachment of a modular curb to the second sidewall. The floor is bounded along peripheral edges by the plurality of sidewalls which extend substantially vertically from the edges. A method of installing a tiled shower is implemented in one embodiment by applying adhesive material on a subfloor within an area bounded by stud framing, setting the prefabricated shower module in place on the subfloor, installing a prefabricated modular curb proximate to at least one sidewall of the module, attaching wallboard to the framing, and installing tile over the wallboard, module and curb.